(19)
(11)EP 3 473 376 B1

(12)EUROPEAN PATENT SPECIFICATION

(45)Mention of the grant of the patent:
09.12.2020 Bulletin 2020/50

(21)Application number: 18200420.0

(22)Date of filing:  15.10.2018
(51)International Patent Classification (IPC): 
B23Q 7/14(2006.01)
B23Q 11/08(2006.01)

(54)

PALLET CHANGING APPARATUS

PALETTENWECHSELVORRICHTUNG

APPAREIL DE CHANGEMENT DE PALETTE


(84)Designated Contracting States:
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

(30)Priority: 20.10.2017 JP 2017203627

(43)Date of publication of application:
24.04.2019 Bulletin 2019/17

(73)Proprietor: Matsuura Machinery Corporation
Fukui City, Fukui (JP)

(72)Inventors:
  • KATO, Toshihiko
    Fukui City, Fukui (JP)
  • TAMETO, Takashi
    Fukui City, Fukui (JP)
  • HORIGUCHI, Kyusuke
    Fukui City, Fukui (JP)

(74)Representative: Lambacher, Michael et al
V. Füner Ebbinghaus Finck Hano Patentanwälte Mariahilfplatz 3
81541 München
81541 München (DE)


(56)References cited: : 
EP-A1- 2 732 910
JP-A- S63 256 331
JP-A- S59 232 742
US-A1- 2004 107 556
  
      
    Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention).


    Description

    [Technical Field]



    [0001] This invention relates to a pallet changing apparatus which arranges a turning shaft for supporting a pallet changing arm transferring a pallet between a pallet setup base and a table in such a manner so as to move freely at a vertical direction and also in a state of being stationary at a horizontal direction.

    [Background Art]



    [0002] The pallet changing apparatus equips, as essential constituents, the pallet setup base which places the pallet, the table which places a workpiece with a state of before processing or after processed by means of the pallet, and the turning shaft which holds pallet changing arms extended on both sides and also turns along a horizontal direction together with the pallet changing arms.

    [0003] The turning shaft equips a turning supporting portion which allows a ball bearing device, etc., to turn smoothly below a site which supports the pallet changing arm. In recent years, there is favorably adopted such a configuration that has a covering portion which covers across upper side of a turning supporting portion in order to prevent chips generated due to cutting of workpieces by a main shaft from entering into the turning supporting portion.

    [0004] On the other hand, for the sake of convenience of cutting work by the main shaft, the table often equips a rising portion which has a oscillating center axis at a leading end of the table on the side of the turning shaft for allowing a region which places a workpiece by means of a pallet to oscillate freely and also equips a oscillating portion in which the region is supported by the turning shaft.

    [0005] Where the table having the above-described rising portion moves back from and forth for a side of the turning shaft having the covering portion, the presence of the rising portion inevitably hinders the turning of the pallet changing arm.

    [0006] Further, the fact that a certain space is occupied by the turning shaft firmly fixing the covering portion makes more worse state for the above-mentioned is necessary for hindering problem.

    [0007] in order to avoid the above-described problem, instead of the table which has the rising portion and moves back from and forth for a side of the turning shaft, there can be conceived such a configuration that, as shown in Fig. 7, a turning shaft 1 which firmly fixes a covering portion 2 is arranged at a side portoin in a direction at which a table 4 which has a oscillating portion 41 and a rising portion 42 at the leading end side of the table moves back and forth, a pallet setup base 5 is arranged at a side portion further away from the table 4, and also the direction at which the table 4 moves back and forth is orthogonal to a direction at which the turning shaft 1 and the setup base 5 are arranged.

    [0008] However, in the case of the configuration of the above-described arrangement, in addition to a space region in a direction at which the table 4 moves back and forth, a space region is also necessary at the side portion for changing a pallet. Thereby, it is impossible to achieve a compact pallet changing apparatus.

    [0009] Where the configuration in which the table moves back from and forth for a side of the turning shaft is compared with the above-described configuration in which the constituents are arranged at the side portions, there is found such a relationship that the former configuration is larger in a region in which the table overlaps with the pallet changing arm in a vertical direction than the latter configuration. In the former configuration, it is possible to set the space necessary for turning of the pallet changing arm small.

    [0010] Instead of the configuration in which the constituents are arranged at the side portions, where there is retained the configuration in which the table having the rising portion and the oscillating portion moves back from and forth for a side of the turning shaft, it is possible to conceive such a configuration that, on transfer of a pallet by using a table and a setup base, a turning shaft moves from an intermediate position between the table and the setup base to a position suitable for the transfer.

    [0011] However, in the case of the above-described configuration, it is essential that not only the table moves back and forth but also the turning shaft moves. Therefore, complicated control becomes essential.

    [0012] With regard to a pallet changing apparatus, various publicly-known technologies have been disclosed.

    [0013] Of these publicly known technologies, in Patent Document 1, an oscillatory table 6 is moved by a table-driving device 30. However, a supporting shaft 42 which corresponds to the turning shaft is arranged at an oblique side portion in a direction at which the table 6 moves (Figs. 1,3,4: the supporting shaft 42 is not provided with a covering portion).

    [0014] However, as compared with the case of the orthogonal state shown in Fig. 5, the configuration of the above arrangement is such that a space region of the side portion necessary for changing a pallet is slightly smaller. This configuration is also unable to achieve a compact pallet changing apparatus.

    [0015] In Patent Document 2, a turning member 34 which corresponds to the pallet changing arm is installed on a side of a table 6 which can oscillate along a oscillating axis 19 provided at a supporting portion 17 which corresponds to the rising portion, and also one of or both of the table 6 and a turning member 34 are allowed to move back and forth with each other (Fig. 2 and Claim 1: the turning member 34 is not provided with a covering portion).

    [0016] However, the above-described configuration is also similar to the configuration shown in Fig. 5 and the configuration described in Patent Document 1 in that it is unable to achieve a compact pallet changing apparatus.

    [0017] Additionally, in the case of the above-described configuration, the table 6 is not only required to move back from and forth for a side of a lower region of the main shaft, but the turning member 34 and/or the table 6 are required to move back and forth with each other in a direction different from the above-described back and forth movement. Therefore, complicated control is essential.

    [0018] From document EP 2 732 910 A1 a rotary workhead device is known, which is disposed on a table of a machine tool, for rotatably mounting a workpiece to be processed, comprising a base plate, two opposing rotary workheads, guide means, and biasing means for biasing one of the rotary workheads in the direction away from or toward the other of the rotary workheads. A tensile or compressive force is applied to the workpiece secured at its ends between the two rotary workheads.

    [0019] As described so far, although referring the publicly known technologies, proposal is not found for compact configuration of a pallet changing apparatus at all which supports a workpiece so as to oscillate by means of a pallet and which is provided with a rising portion having an oscillating center axis at the leading end of the turning shaft of the table which moves back from and forth for a side of the turning shaft and also covers across upper side of a turning supporting portion at a lower end of the turning shaft.

    [Prior Art Documents]


    [Patent Documents]



    [0020] 

    [Patent Document 1] Japanese Published Unexamined Patent Application No. 2004-160601

    [Patent Document 2] Japanese Published Unexamined Patent Application No. 2015-205356


    [Summary of Invention]


    [Technical Problem]



    [0021] An object of the present invention is to provide a compact configuration of a pallet changing apparatus which is provided with a rising portion with an oscillating center axis at a leading end of the table that supports a workpiece by oscillatory state by means of a pallet and moves back from and forth for a side of the turning shaft.

    [Solution to Problem]



    [0022] In order to solve the above problem, a basic configuration of the invention is a pallet changing apparatus as defined by Claim 1.

    [Advantageous Effects of Invention]



    [0023] The present invention which is based on the above basic configuration achieves a state that the bridging extending portion of each of the pallet changing arms extended on both sides of the turning shaft is arranged to cover across the upper side of the rising portion at a stage that the table transfers a pallet. Therefore, an existence of the rising portion does not correspond to an obstacle for turning of the pallet changing arms.

    [0024] Further, in the case of adopting embodiment in which the rising portion positioned at the leading end of the table is arranged in the vicinity of the surface of the turning shaft at the above-described stage, it is possible to achieve a compact pallet changing apparatus by setting the length of the pallet changing arm shorter than the length compared with the case of the prior art.

    [Brief Description of Drawings]



    [0025] 

    Fig. 1 shows a configuration of the basic configuration, (a) shows a side sectional view thereof along a direction at which the table moves back and forth, and (b) shows a front view along a direction at which the table moves back and forth.

    Fig. 2 shows a configuration of an embodiment in which a turning shaft firmly fixes a covering portion and the covering portion is provided with an insertion and removal hole which allows a rising portion of a table to be inserted and removed freely, (a) shows a side sectional view thereof along a direction at which the table moves back and forth (a covering portion and pallet changing arms are shown by a sectional view and other constituents are shown by a side elevational view. Further, a patterned portion shows a region other than the rising portion and the pivoting portion of the table.). And, (b) shows a front view of the covering portion on a side at which the insertion/removal hole is provided.

    Fig. 3 shows a configuration of an embodiment in which a turning shaft is provided with a movable covering portion, a stationary covering portion is arranged below the movable covering portion and the stationary covering portion is provided with an insertion and removal hole which allows a rising portion of a table to be inserted and removed freely, (a) shows a side sectional view thereof along a direction at which the table moves back and forth (the movable covering portion, the stationary covering portion and pallet changing arms are shown by a sectional view and other constituents are shown by a side elevational view. Further, a patterned portion shows a region other than the rising portion and a pivoting portion of the table.) and, (b) shows a front view of the covering portion on a side at which the insertion and removal hole is provided.

    Fig. 4 shows a configuration of an embodiment in which a turning shaft firmly fixes a covering portion, and a rising portion positioned at a leading end of a table and a lower supporting portion at a side of the rising portion form a detached state from the covering portion at a stage of transferring a pallet, and (a) shows a side sectional view thereof along a direction at which the table moves back and forth (the covering portion and pallet changing arms are shown by a sectional view, and other constituents are shown by a side elevational view. Further, a patterned portion shows a region other than the rising portion and the pivoting portion of the table.) and, (b) shows a top view of the covering portion as well as the rising portion and a pivoting portion of the table (a circular-arc shaped dotted line shows a state that the covering portion is arranged below the rising portion and the lower supporting portion at a side of the rising portion).

    Fig. 5 shows a configuration of an embodiment in which a turning shaft firmly fixes a movable covering portion, and a stationary covering portion is arranged on a floor below the movable covering portion, and a rising portion positioned at a leading end of a table and a lower supporting portion at the rising portion form a detached state from the movable covering portion and the stationary covering portion at the stage of transferring a pallet, and (a) shows a side sectional view thereof along a direction at which the table moves back and forth (the movable covering portion, the stationary covering portion and pallet changing arms are shown by a sectional view, and other constituents are shown by a side elevational view, and a patterned portion shows a region other than the rising portion and a oscillating portion of the table.). And, (b) shows a top view of the covering portion as well as the rising portion and the pivoting portion of the table (a circular-arc shaped dotted line shows a state that the movable covering portion and the stationary covering portion are arranged below the rising portion and the lower supporting portion in relation to the rising portion.).

    Fig. 6 is a drawing which explains motions of the pallet changing apparatus of the basic configuration that shows steps covering the start of changing a pallet and up to completion thereof, as the first step in which the rising portion at the leading end of the table on the side of the turning shaft is moved to the turning shaft for transferring a pallet.

    Fig. 7 is a top view which shows a state that the turning shaft and the pallet setup base are arranged in a direction which is orthogonal to a direction at which the table moves back and forth.


    [Description of Embodiments]



    [0026] As described in the Technical Field, the basic configuration shown in Fig. 1 stands on a technically basic premise that the table 4 moves back from and forth for a side of the turning shaft 1 and is also provided with the oscillating portion 41 which is supported so as to oscillate freely by means of a oscillating center axis 420 of the rising portion 42 positioned at the leading end of the table on the side of the turning shaft 1 and places workpieces W, W' by means of pallets P, P'.

    [0027] In the basic configuration, the oscillating portion 41 which supports workpieces W, W' by means of the supporting frame 40 inside the table 4 and a supporting surface which supports the pallets P, P' by means of the supporting frame 50 inside the setup base 5 are both arranged so as to be lower than a position at which a supporting portion of the pallet changing arm 3 turns. Therefore, the supporting portion is arranged above the oscillating portion 41 and the supporting surfaces of the setup base 5.

    [0028] As shown in Fig. 1, while the pallet changing arms 3 of the basic configuration are firmly fixed to the turning shaft 1 and extended on both sides, the supporting portions at the leading ends thereof turn to the positions below the pallets P, P' supported by the pallet supporting frames 40, 50 respectively and is also able to move to upper region for supporting surface of the oscillating portion 41 and the setup base 5 together with the turning shaft 1 in a state of supporting the pallets P, P'.

    [0029] Then, as shown in Fig. 1(a), the pallet changing arms 3 of the basic configuration are each provided with a bridging extending portion 31 which bridges the pallet supporting portion extending in a horizontal direction with the positions of the both sides of the turning shaft 1, and the bridging extending portion 31 forms a shape of covering across the upper side of the rising portion 42 at a stage of the table 4 transferring pallets P, P'.

    [0030] As a result, when the pallet changing arms 3 turn to the side of the table 4 on transferring pallets P, P', the presence of the rising portion 42 does not hinder the turning.

    [0031] In Fig. 1(a), (b), the bridging extending portion 31 is extended obliquely from a side of the turning shaft 1 and forms approximately an L-letter shape. However, various shapes can be adopted as the bridging extending portion 31.

    [0032] As shown in Fig. 2 and Fig. 4, for example, there can be adopted a shape in which the bridging extending portion 31 is extended in an obliquely linear manner from the side of the turning shaft 1 and reaches to the portion of supporting pallet P, P'. Further, as shown in Fig. 3 and Fig. 5, there can be adopted a shape in which the bridging extending portion 31 is extended from a side of the turning shaft 1 in a horizontal direction and sequentially curved and reaches to the portion of supporting pallet P, P'.

    [0033] In the basic configuration, as shown in Fig. 1(a), (b), it is not necessarily required to cover a turning supporting portion 11 at a lower end portion of the turning shaft 1.

    [0034] However, in a machine tool, as a result of cutting workpieces, with consideration given to flying chips, as shown in Figs. 2, 3, 4, 5 and 6, a pallet changing apparatus is in most cases provided with the covering portion 2.

    [0035] It is possible to describe as follows regarding an embodiment which covers the turning supporting portion 11 at the lower end portion of the turning shaft 1 from upper side.

    [0036] Fig. 2 (a), (b) each show the embodiment characterized in that, the turning shaft 1 firmly fixes the covering portion 2 which covers across the upper side of the turning supporting portion 11 positioned at a lower end side of the turning shaft 1, and the covering portion 2 equips the insertion and removal hole 20 which allows the rising portion 42 to be inserted and removed freely.

    [0037] In the above-described embodiment, the rising portion 42 positioned at the leading end of the table 4 is inserted into the insertion and removal hole 20, by which, pallets P, P' arranged on the table 4 can be transferred in a state of being made close to the side of the turning shaft 1, although the covering portion 2 is interposed between the table 4 and the pallet setup base 5.

    [0038] As a result, the compact pallet changing apparatus can be achieved, although the covering portion 2 is large in size, as shown in Fig. 2 (a), (b).

    [0039] Fig. 3 (a), (b) each show the embodiment characterized in that the turning shaft 1 firmly fixes the movable covering portion 21.

    [0040] On the other hand, the stationary covering portion 22 covering across upper side of the turning supporting portion 11 positioned at a lower end side of the turning shaft 1 is arranged below the movable covering portion 21, and the stationary covering portion 22 equips the insertion and removal hole 20 which allows the rising portion 42 to be inserted and removed freely.

    [0041] In the above-described embodiment as well, the rising portion 42 positioned at the leading end of the table 4 is inserted into the insertion and removal hole 20, by which pallets P, P' placed on the table 4 can be transferred in a state of being close to the side of the turning shaft 1, although the stationary covering portion 22 is set up between the table 4 and the pallet setup base 5.

    [0042] As a result, it is possible to achieve the compact pallet changing apparatus, although the movable covering portion 21 and the stationary covering portion 22 which are large in size are present, as shown in Fig. 3(a), (b).

    [0043] In the above-described embodiment, it is possible to form a state that the movable covering portion 21 firmly fixed to the turning shaft 1 has a region which overlaps at least partially with the stationary covering portion 22 in a vertical direction. The reason for such configuration stands on preventing flying chips from entering into the turning supporting portion 11 by integration of the movable covering portion 21 with the stationary covering portion 22.

    [0044] On the other hand, the insertion and removal hole 20 often allows not only the rising portion 42 but also the oscillating portion 41 and a certain region of the table 4 such as a lower region for supporting the oscillating portion 41 shown by a patterned region in Fig. 2(a) or Fig. 3(a) to be inserted and removed freely.

    [0045] Fig. 4 (a), (b) each show the embodiment characterized in that the turning shaft 1 firmly fixes the covering portion 2 covering across upper side of the turning supporting portion 11 positioned at a lower end side of the turning shaft 1, and the rising portion 42 and the lower supporting portion at the side of the rising portion 42 form a detached state from the covering portion 2 at a vertical direction and at a horizontal direction at a stage of the table 4 transferring the pallets P, P'.

    [0046] In the above-described embodiment, at a stage that the table 4 transfers pallets P, P', such a state is achieved that the rising portion 42 and the lower supporting portion at the side of the rising portion 42 form the detached state from the covering portion 2 at a vertical direction and at a horizontal direction, according to such a state that the rising portion 42 can be close to the turning shaft 1 at the stage of the above-described transfer without hindering the turning of the covering portion 2. As a result, it is possible to achieve the compact pallet changing apparatus.

    [0047] Further, the above-described embodiment does not need insertion of the rising portion 42 into the insertion and removal hole 20, although the rising portion 42 is inserted in the embodiment shown in Fig. 2(a), (b). Therefore, the covering portion 2 can be designed to be small to such an extent that exclusively covers the turning supporting portion 11.

    [0048] Fig. 5 (a), (b) each show the embodiment characterized in that the turning shaft 1 firmly fixes the movable covering portion 21.

    [0049] On the other hand, the stationary covering portion 22 covering across upper side of the turning supporting portion 11 positioned at a lower end side of the turning shaft 1 is arranged below the movable covering portion 21, and
    the rising portion 42 and the lower supporting portion at the side of the rising portion 42 each form a detached state from the movable covering portion 21 and the stationary covering portion 22 at a vertical direction and at a horizontal direction at a stage of the table 4 transferring pallets P, P'.

    [0050] In the above-described embodiment as well, at a stage that the table 4 transfers pallets P, P', the rising portion 42 and the lower supporting portion at the side of the rising portion 42 form a detached state from the movable covering portion 21 and the stationary covering portion 22 at a vertical direction and at a horizontal direction. It is, therefore, possible to form a state that the rising portion 42 is close to the turning shaft 1 without an obstacle for turning of the movable covering portion 21, and as a result, it is possible to achieve the compact pallet changing arm 3.

    [0051] Various shapes can be designed as a shape achieving the state described previously in the embodiment shown in Fig. 4(a), (b) in which the rising portion 42 and the lower supporting portion at the side of the rising portion 42 form a detached state from the covering portion 2 at a vertical direction and at a horizontal direction and as a shape achieving the state described previously in the embodiment shown in Fig. 5 (a), (b) in which the rising portion 42 and the lower supporting portion at the side of the rising portion 42 form a detached state from the movable covering portion 21 and the stationary covering portion 22 at a vertical direction and at a horizontal direction. In Fig. 4 (a), (b), it is possible to adapt a design characterized in that the lower supporting portion at the side of the rising portion 42 is formed in a reverse L-letter shape when viewed from a cross section thereof. In Fig. 5 (a), (b), it is possible to adapt a design characterized in that the lower supporting portion at the side of the rising portion 42 forms a curved surface whose radius value of coverture is larger than that of an outer surface of the covering portion 2 or outer surfaces of the movable covering portion 21 and the stationary covering portion 22 with a standard of a lower-end center position along the turning shaft 1.

    [0052] In the embodiments shown in Fig. 2 and Fig. 4, the covering portion 2 covers the turning supporting portion 11 positioned at the lower end of the turning shaft 1, and does not contact with a floor surface as long as it integrally turns with the turning shaft 1.

    [0053] However, since such a configuration is adopted that the lower end of the covering portion 2 is arranged so as to be lower than a position at which the pallet changing arm 3 is extended and also in the vicinity of a floor, the covering portion 2 is able to sufficiently perform functions of preventing chips from entering into the turning supporting portion 11.

    [0054] In the embodiments shown in Fig. 3 and Fig. 5, since the stationary covering portion 22 is arranged on a floor surface bellow, thus making it possible to sufficiently prevent chips from entering into the turning supporting portion 11 positioned at a lower end side of the turning shaft 1.

    [0055] Especially in the case of a configuration that the lower end side of the stationary covering portion 22 is firmly fixed on a floor, it is possible to completely prevent flying chips from entering thereinto.

    [0056] Although it is essential that the turning shaft 1 turns together with the pallet changing arms 3 and also moves freely in a vertical direction, in order to achieve the above-described turning and vertical movement, as shown in Fig. 1(a), (b), Fig. 2 (a), (b), Fig. 3 (a), (b), Fig. 4(a) and Fig. 5 (a), a driving portion 12 is connected to the turning shaft 1 and also firmly fixed to a floor surface or a wall portion. Thereby, the driving portion 12 is firmly fixed to a fixed frame 13 in a fixed state and able to drive the turning and the vertical movement.

    [0057] In the basic configuration shown in Fig. 1 and the individual embodiments shown in Figs. 2, 3, 4 and 5, after first step of inserting the rising portion 42 of the table 4 and a partial region of the table 4 connected to the rising portion 42 into the insertion and removal hole 20, actions from beginning and until finishing of exchanging pallets P, P' may be achieved along following processes as is shown in Fig.6.

    [0058] Fig. 6 is based on the embodiment in which the turning supporting portion 11 is not covered as shown in Fig. 1. However, the following processes will not be changed in the embodiment which is provided with the covering portion 2 as shown in Fig. 2 or 4 and in the embodiment which is provided with the movable covering portion 21 and the stationary covering portion 22 as shown in Fig. 3 or 5.

    [0059] Process (a): Approaching the rising portion 42 of the table 4 to the turning shaft 1 (in the embodiment shown in Fig. 2 or Fig. 3, the rising portion 42 or a partial region of the table 4 connected to the rising portion 42 is inserted into the insertion and removal hole 20, and in the embodiment shown in Fig. 4 or Fig. 5, such a state is achieved that the rising portion 42 and the covering portion 2 of the lower supporting portion in relation to the rising portion 42 or the movable covering portion 21 and the stationary covering portion 22 are arranged so as to be away at a vertical direction and at a horizontal direction),

    [0060] Process (b): integral turning of the pallet changing arm 3 in a stand-by state together with the turning shaft 1,

    [0061] Process (c): movement of pallets P, P' supported by the supporting frame 40 in the oscillating portion 41 of the supporting portion of the pallet changing arm 3 and that of the pallets P, P' supported by the supporting frame 50 in the setup base 5 by downward turning,

    [0062] Process (d): upward movement of the turning shaft 1 with the pallet changing arms 3 supporting pallets P, P' (In the embodiment shown in Fig. 2 or Fig. 4, the turning shaft 1 and the covering portion 2 move upward, and in the embodiment shown in Fig. 3 or Fig. 5, the turning shaft 1 and the movable covering portion 21 move upward),

    [0063] Process (e): 180 degree-turning of the pallet changing arms 3 which support the pallets P, P',

    [0064] Process (f): downward movement of the turning shaft 1 with the pallet changing arms 3 which support pallets P, P' (In the embodiment shown in Fig. 2 or Fig. 4, the turning shaft 1 and the covering portion 2 move downward, and in the embodiment shown in Fig. 3 or Fig. 5, the turning shaft 1 and the movable covering portion 21 move downward) and placement of each of the pallets P, P' on the supporting frame 40 of the oscillating portion 41 and on the supporting frame 50 of the setup base 5, and

    [0065] Process (g): return to an original position by turning of the pallet changing arms 3.

    [0066] As described above, the basic configuration shown in Fig. 1 and the embodiments shown in Figs. 2, 3, 4 and 5 are able to smoothly change the pallets P, P' which respectively place workpieces W, W' by a series of turning and vertical movement.

    [0067] Hereinafter, a description will be given with reference to the examples.

    [Example]



    [0068] The Example is characterized in that a door (not shown) for opening and closing the insertion and removal hole 20 is provided at the covering portion 2 of the embodiment shown in Fig. 2 (a), (b) and at the stationary covering portion 22 of the embodiment shown in Fig. 3 (a), (b).

    [0069] Installation of the door makes it possible to prevent chips from entering into the turning supporting portion 11 by closing the door even after insertion of the rising portion 42 and a certain region of the table 4 through the insertion and removal hole 20.

    [0070] With a consideration on a space necessary for opening and closing the door, a sliding door is more preferable than a revolving door.

    [0071] The basic configuration as shown in Fig. 1 and in the individual embodiments shown in Figs. 2, 3, 4 and 5, in which the rising portion 42 is arranged to exist at the vicinity of the surface of the turning shaft at the stage in which the rising portion 42 is set to be most close state to the turning shaft 1 to achieve that the table 4 transfers the pallet P.

    [0072] In the basic configuration, the pallet changing arms 3 can be made shortest in length by arranging the rising portion 42 in the vicinity, thereby a compact pallet changing apparatus can be achieved.

    [Industrial Applicability]



    [0073] As described so far, in the present invention in which the bridging extending portion which is extended from the turning shaft is arranged to cover across the upper side of the rising portion of the table at a stage the table transferring a pallet, the presence of the rising portion does not hinder turning of the pallet changing arm. Further, the present invention is remarkably innovative in achieving a compact pallet changing apparatus and can be used in all types of machine tools that require pallet change.

    [Reference Signs List]



    [0074] 

    1: Turning shaft

    11: Turning supporting portion

    12: Driving portion for turning shaft

    13: Fixed frame

    2: Covering portion

    20: Insertion and removal hole

    21: Movable covering portion

    22: Stationary covering portion

    3: Pallet changing arm

    31: Bridging extending portion

    4: Table

    40: Supporting frame for pallet arranged at oscillating portion

    41: Oscillating portion of table

    42: Rising portion of table

    420: Oscillating center axis of rising portion

    5: Setup base

    50: Supporting frame for pallet arranged on setup base

    6: Machine tool provided with main shaft, etc.

    P, P': Pallet

    W, W': Workpiece




    Claims

    1. A pallet changing apparatus provided with a turning shaft (1) supporting pallet changing arms (3) transferring a pallet (P, P') between a pallet setup base (5) and a table (4) in such a manner so as to move freely at a vertical direction and also in a state of being stationary at a horizontal direction,
    said apparatus comprising said table (4) being configured to move back and forth to a side of the turning shaft (1) and being provided with a rising portion (42) at a leading end of the table (4) on the side of the turning shaft (1) and an oscillating portion (41) which is supported so as to oscillate freely around an oscillating center axis (420) of the rising portion (42) and configured to place a workpiece (W, W') by means of a pallet (P, P'),
    wherein the pallet changing arms (3) extend on both sides of the turning shaft (1), the pallet changing arms (3) being provided with a bridging extending portion (31) which bridges a pallet supporting portion extending in the horizontal direction for transferring a pallet (P, P') with a side of the turning shaft (1), and the bridging extending portion (31) forms a shape of covering across an upper side of the rising portion (42) at a stage of the table (4) transferring a pallet (P, P'), wherein the rising portion (42) is arranged to exist at the vicinity of the surface of the turning shaft (1) at the stage in which the rising portion (42) is set to be closest to the turning shaft (1) to achieve that the table (4) transfers the pallet (P, P').
     
    2. The pallet changing apparatus according to claim 1, wherein
    a covering portion (21) is firmly fixed on the turning shaft (1), wherein the covering portion (21) covers across an upper side of a turning supporting portion (11) positioned at a lower end side of the turning shaft (1), and the covering portion (21) is provided with an insertion and removal hole (20) which allows the rising portion (42) to be inserted and removed freely.
     
    3. The pallet changing apparatus according to claim 1, wherein
    a movable covering portion (21) is firmly fixed on the turning shaft (1),
    wherein a stationary covering portion (22) covering across an upper side of a turning supporting portion (11) positioned at a lower end side of the turning shaft (1) is arranged below the movable covering portion (21), and the stationary covering portion (22) is provided with an insertion and removal hole (20) which allows the rising portion (42) to be inserted and removed freely.
     
    4. The pallet changing apparatus according to claim 2 or claim 3, wherein also a partial region of the table (4) connected to the rising portion (42) is inserted freely into the insertion and removal hole (20) and removed freely from the insertion and removal hole (20).
     
    5. The pallet changing apparatus according to any one of claims 2, 3 and 4, wherein a door is provided for opening and closing the insertion and removal hole (20).
     
    6. The pallet changing apparatus according to claim 1,
    wherein a covering portion (21) is firmly fixed on the turning shaft (1), wherein the covering portion (21) covers across an upper side of a turning supporting portion (11) positioned at a lower end side of the turning shaft (1), and
    a lower supporting portion (421) is provided at the side of the rising portion (42) forming a reverse L-letter shape when viewed from a cross section thereof along a longitudinal direction of the table (4), the rising portion (42) and the lower supporting portion (421) being detached from the covering portion at a vertical direction and at a horizontal direction at a stage of the table (4) transferring the pallet (P, P').
     
    7. The pallet changing apparatus according to claim 1,
    wherein a movable covering portion (21) is firmly fixed on the tuning shaft (1),
    wherein a stationary covering portion (22) covering across an upper side of a turning supporting portion (11) positioned at a lower end side of the turning shaft (1) is arranged below the movable covering portion (21), and
    a lower supporting portion (421) is provided at the side of the rising portion (42) forming a reverse L-letter shape when viewed from a cross section thereof along a longitudinal direction of the table (4), the rising portion (42) and the lower supporting portion (421) being detached from the movable covering portion (21) and the stationary covering portion (22) at a vertical direction and at a horizontal direction at a stage of the table (4) transferring pallets (P, P').
     
    8. The pallet changing apparatus according to claim 1,
    wherein a covering portion (21) is firmly fixed on the turning shaft (1), wherein the covering portion (21) covers across an upper side of a turning supporting portion (11) positioned at a lower end side of the turning shaft (1),
    the lower supporting portion (11) on the side of the rising portion (42) having a larger radius of curvature than a radius curvature of the covering portion (21) is formed higher than or with the same height as the covering portion (21),
    the higher portion is not in contact with an outer side at the upper side outside of the covering portion (21),
    the same height portion is longer than the outer side on a basis of the oscillating center axis (420) of the turning shaft (1), and then
    the rising portion (42) and the lower supporting portion (11) are detached from the covering portion (21) at a vertical direction and at a horizontal direction at a stage of the table (4) transferring the pallet (P, P').
     
    9. The pallet changing apparatus according to claim 1,
    wherein a movable covering portion (21) is firmly fixed on the turning shaft (1),
    wherein a stationary covering portion (22) covering across an upper side of a turning supporting portion (11) positioned at a lower end side of the turning shaft (1) is arranged below the movable covering portion (21), and
    the lower supporting portion (11) at the side of the rising portion (42) having a larger radius of curvature than a radius curvature of the movable covering portion (21) and the stationary covering portion (22) is formed higher than or with the same height as the movable covering portion (21) and the stationary covering portion (22),
    the higher portion is not in contact to an outer side at the upper side on the outside of the movable covering portion (21) and the stationary covering portion (22),
    the same height portion is longer than the outer side on a basis of the oscillating center axis (420) of the turning shaft (1), and then
    the rising portion (42) and the lower supporting portion (11) are detached from the movable covering portion (21) and the stationary covering portion (22) at a vertical direction and at a horizontal direction at a stage of the table (4) transferring the pallet (P, P').
     


    Ansprüche

    1. Palettenwechselvorrichtung, die mit einer Drehwelle (1) versehen ist, die Palettenwechselarme (3) trägt, die eine Palette (P, P') zwischen einer Paletten-Setup-Basis (5) und einem Tisch (4) übertragen, derart, dass sie sich frei in einer vertikalen Richtung bewegt, und auch in einem Zustand, in dem sie in einer horizontalen Richtung stationär ist,
    wobei die Vorrichtung den Tisch (4) umfasst, der dazu konfiguriert ist, sich rückwärts und vorwärts zu einer Seite der Drehwelle (1) zu bewegen, und mit einem ansteigenden Abschnitt (42) an einem voreilenden Ende des Tisches (4) auf der Seite der Drehwelle (1) und einem schwingenden Abschnitt (41) versehen ist, der getragen ist, um frei um eine Schwingungszentrumsachse (420) des ansteigenden Abschnitts (42) zu schwingen, und dazu konfiguriert ist, ein Werkstück (W, W') mittels einer Palette (P, P') zu platzieren,
    wobei sich die Palettenwechselarme (3) auf beiden Seiten der Drehwelle (1) erstrecken, wobei die Palettenwechselarme (3) mit einem überbrückenden Erstreckungsabschnitt (31) versehen sind, der einen sich in der horizontalen Richtung erstreckenden Palettenträgerabschnitt zum Übertragen einer Palette (P, P') mit einer Seite der Drehwelle (1) überbrückt, und der überbrückende Erstreckungsabschnitt (31) in einem Stadium, in dem der Tisch (4) eine Palette (P, P') überträgt, eine Form einer Abdeckung über einer oberen Seite des ansteigenden Abschnitts (42) bildet,
    wobei der ansteigende Abschnitt (42) dazu angeordnet ist, in dem Stadium, in dem der ansteigende Abschnitt (42) dazu eingestellt ist, am nächsten bei der Drehwelle (1) zu sein, sich in der Nähe der Oberfläche der Drehwelle (1) zu befinden, um zu erreichen, dass der Tisch (4) die Palette (P, P') überträgt.
     
    2. Palettenwechselvorrichtung nach Anspruch 1, wobei
    ein Abdeckabschnitt (21) fest an der Drehwelle (1) fixiert ist, wobei der Abdeckabschnitt (21) über einer oberen Seite eines an einer unteren Endseite der Drehwelle (1) positionierten Drehträgerabschnitts (11) abdeckt, und der Abdeckabschnitt (21) mit einem Einfüge- und Entfernungsloch (20) versehen ist, das erlaubt, dass der ansteigende Abschnitt (42) frei eingefügt und entfernt wird.
     
    3. Palettenwechselvorrichtung nach Anspruch 1, wobei
    ein bewegbarer Abdeckabschnitt (21) fest an der Drehwelle (1) fixiert ist,
    wobei ein stationärer Abdeckabschnitt (22), der über einer oberen Seite eines an einer unteren Endseite der Drehwelle (1) positionierten Drehträgerabschnitts (11) abdeckt, unter dem bewegbaren Abdeckabschnitt (21) angeordnet ist, und der stationäre Abdeckabschnitt (22) mit einem Einfüge- und Entfernungsloch (20) versehen ist, das erlaubt, dass der ansteigende Abschnitt (42) frei eingefügt und entfernt wird.
     
    4. Palettenwechselvorrichtung nach Anspruch 2 oder Anspruch 3, wobei auch ein Teilbereich des Tisches (4), der mit dem ansteigenden Abschnitt (42) verbunden ist, frei in das Einfüge-und Entfernungsloch (20) eingefügt wird und frei von dem Einfüge- und Entfernungsloch (20) entfernt wird.
     
    5. Palettenwechselvorrichtung nach einem der Ansprüche 2, 3 und 4, wobei eine Tür zum Öffnen und Schließen des Einfüge- und Entfernungslochs (20) vorgesehen ist.
     
    6. Palettenwechselvorrichtung nach Anspruch 1,
    wobei ein Abdeckabschnitt (21) fest an der Drehwelle (1) fixiert ist, wobei der Abdeckabschnitt (21) über einer oberen Seite eines an einer unteren Endseite der Drehwelle (1) positionierten Drehträgerabschnitts (11) abdeckt, und
    ein unterer Trägerabschnitt (421) auf der Seite des ansteigenden Abschnitts (42) vorgesehen ist, der eine umgekehrte L-Form bildet, wenn er von einem Querschnitt davon längs einer Längsrichtung des Tisches (4) betrachtet wird, wobei der ansteigende Abschnitt (42) und der untere Trägerabschnitt (421) in einem Stadium, in dem der Tisch (4) die Palette (P, P') überträgt, von dem Abdeckabschnitt in einer vertikalen Richtung und in einer horizontalen Richtung losgelöst ist.
     
    7. Palettenwechselvorrichtung nach Anspruch 1,
    wobei ein bewegbarer Abdeckabschnitt (21) fest an der Drehwelle (1) fixiert ist,
    wobei ein stationärer Abdeckabschnitt (22), der über einer oberen Seite eines an einer unteren Endseite der Drehwelle (1) positionierten Drehträgerabschnitts (11) abdeckt, unter dem bewegbaren Abdeckabschnitt (21) angeordnet ist, und
    ein unterer Trägerabschnitt (421) auf der Seite des ansteigenden Abschnitts (42) vorgesehen ist, der eine umgekehrte L-Form bildet, wenn er von einem Querschnitt davon entlang einer Längsrichtung des Tisches (4) betrachtet wird, wobei der ansteigende Abschnitt (42) und der untere Trägerabschnitt (421) in einem Stadium, in dem der Tisch (4) die Palette (P, P') überträgt, von dem bewegbaren Abdeckabschnitt (21) und dem stationären Abdeckabschnitt (22) in einer vertikalen Richtung und in einer horizontalen Richtung losgelöst ist.
     
    8. Palettenwechselvorrichtung nach Anspruch 1,
    wobei ein Abdeckabschnitt (21) fest an der Drehwelle (1) fixiert ist, wobei der Abdeckabschnitt (21) über einer oberen Seite eines an einer unteren Endseite der Drehwelle (1) positionierten Drehträgerabschnitts (11) abdeckt, und,
    der untere Trägerabschnitt (11) auf der Seite des ansteigenden Abschnitt (42), der einen größeren Krümmungsradius als eine Radiuskrümmung des Abdeckabschnitts (21) aufweist, höher als oder mit der gleichen Höhe wie der Abdeckabschnitt (21) gebildet ist,
    der höhere Abschnitt nicht in Kontakt mit einer Außenseite an der oberen Seite außerhalb des Abdeckabschnitts (21) ist,
    der Abschnitt mit der gleichen Höhe länger als die Außenseite auf einer Basis der Schwingungszentrumsachse (420) der Drehwelle (1) ist, und dann
    der ansteigende Abschnitt (42) und der untere Trägerabschnitt (11) in einem Stadium, in dem der Tisch (4) die Palette (P, P') überträgt, von dem Abdeckabschnitt (21) in einer vertikalen Richtung und in einer horizontalen Richtung losgelöst ist.
     
    9. Palettenwechselvorrichtung nach Anspruch 1,
    wobei ein bewegbarer Abdeckabschnitt (21) fest an der Drehwelle (1) fixiert ist,
    wobei ein stationärer Abdeckabschnitt (22), der über einer oberen Seite eines an einer unteren Endseite der Drehwelle (1) positionierten Drehträgerabschnitts (11) abdeckt, unter dem bewegbaren Abdeckabschnitt (21) angeordnet ist, und
    der untere Trägerabschnitt (11) auf der Seite des ansteigenden Abschnitts (42), der einen größeren Krümmungsradius als eine Radiuskrümmung des bewegbaren Abdeckabschnitt (21) und des stationären Abdeckabschnitts (22) aufweist, höher als oder mit der gleichen Höhe wie der bewegbare Abdeckabschnitt (21) und der stationäre Abdeckabschnitt (22) gebildet ist,
    der höhere Abschnitt nicht in Kontakt mit einer Außenseite an der oberen Seite auf der Außenseite des bewegbaren Abdeckabschnitts (21) und des stationären Abdeckabschnitt (22) ist,
    der Abschnitt mit der gleichen Höhe länger als die Außenseite auf einer Basis der Schwingungszentrumsachse (420) der Drehwelle (1) ist, und dann
    der ansteigende Abschnitt (42) und der untere Trägerabschnitt (11) in einem Stadium, in dem der Tisch (4) die Palette (P, P') überträgt, von dem bewegbaren Abdeckabschnitt (21) und dem stationären Abdeckabschnitt (22) in einer vertikalen Richtung und in einer horizontalen Richtung losgelöst ist.
     


    Revendications

    1. Appareil de changement de palette doté d'un arbre rotatif (1) supportant des bras de changement de palette (3) transférant une palette (P, P') entre une base de réglage de palette (5) et une table (4) de façon à la déplacer librement dans une direction verticale et également dans un état fixe dans une direction horizontale,
    ledit appareil comprenant ladite table (4) configurée afin d'avancer et de reculer vers un côté de l'arbre rotatif (1) et étant doté d'une partie montante (42) à une extrémité avant de la table (4) sur le côté de l'arbre rotatif (1) et une partie oscillante (41) qui est supportée de façon à osciller librement autour d'un axe central oscillant (420) de la partie montante (42) et configurée afin de placer une pièce à travailler (W, W') au moyen d'une palette (P, P'),
    dans lequel les bras de changement de palette (3) s'étendent sur les deux côtés de l'arbre rotatif (1), les bras de changement de palette (3) étant dotés d'une partie d'extension de raccordement (31) qui relie une partie de support de palette s'étendant dans la direction horizontale afin de transférer une palette (P, P') avec un côté de l'arbre rotatif (1), et la partie d'extension de raccordement (31) forme une forme de couverture à travers un côté supérieur de la partie montante (42) en une phase de la table (4) transférant une palette (P, P'),
    dans lequel la partie montante (42) est agencée afin d'exister à proximité de la surface de l'arbre rotatif (1) à la phase dans laquelle la partie montante (42) est réglée afin d'être la plus proche de l'arbre rotatif (1) afin de faire en sorte que la table (4) transfère la palette (P, P').
     
    2. Appareil de changement de palette selon la revendication 1, dans lequel
    une partie de couverture (21) est fermement fixée sur l'arbre rotatif (1), dans lequel la partie de couverture (21) recouvre un côté supérieur d'une partie de support rotative (11) positionnée sur un côté d'extrémité inférieure de l'arbre rotatif (1), et la partie de couverture (21) est dotée d'un orifice d'insertion et d'enlèvement (20) qui permet d'insérer et d'enlever librement la partie montante (42).
     
    3. Appareil de changement de palette selon la revendication 1, dans lequel
    une partie de couverture mobile (21) est fermement fixée sur l'arbre rotatif (1),
    dans lequel une partie de couverture fixe (22) recouvrant un côté supérieur d'une partie de support rotative (11) positionnée sur un côté d'extrémité inférieur de l'arbre rotatif (1) est agencé sous la partie de couverture mobile (21), et la partie de couverture fixe (22) est dotée d'un orifice d'insertion et d'enlèvement (20) qui permet d'insérer et d'enlever librement la partie montante (42).
     
    4. Appareil de changement de palette selon la revendication 2 ou 3, dans lequel également une région partielle de la table (4) raccordée à la partie montante (42) est insérée librement dans l'orifice d'insertion et d'enlèvement (20) et enlevée librement de l'orifice d'insertion et d'enlèvement (20).
     
    5. Appareil de changement de palette selon l'une quelconque des revendications 2, 3 et 4, dans lequel une porte est fournie pour l'ouverture et la fermeture de l'orifice d'insertion et d'enlèvement (20).
     
    6. Appareil de changement de palette selon la revendication 1, dans lequel
    une partie de couverture (21) est fermement fixée à l'arbre rotatif (1), dans lequel la partie de couverture (21) recouvre un côté supérieur d'une partie de support rotative (11) positionnée sur un côté d'extrémité inférieur de l'arbre rotatif (1), et
    une partie de support inférieure (421) est ménagée sur le côté de la partie montante (42) formant une forme de lettre L inversée vue depuis une coupe transversale correspondante le long d'une direction longitudinale de la table (4), la partie montante (42) et la partie de support inférieure (421) étant détachée de la partie de couverture dans une direction verticale et dans une direction horizontale à une phase de la table (4) transférant la palette (P, P').
     
    7. Appareil de changement de palette selon la revendication 1,
    dans lequel une partie de couverture mobile (21) est fermement fixée à l'arbre rotatif (1),
    dans lequel une partie de couverture fixe (22) couvrant un côté supérieur d'une partie de support rotative (11) positionnée sur un côté inférieur de l'arbre rotatif (1) est agencée sous la partie de couverture mobile (21), et
    une partie de support inférieure (421) est ménagée sur le côté de la partie montante (42) formant une forme de lettre de L inversée vue depuis une coupe transversale correspondante le long d'une direction longitudinale de la table (4), la partie montante (42) et la partie de support inférieure (421) étant détachées de la partie de couverture mobile (21) et de la partie de couverture fixe (22) dans une direction verticale et dans une direction horizontale dans une phase de la table (4) transférant des palettes (P, P').
     
    8. Appareil de changement de palette selon la revendication 1,
    dans lequel une partie de couverture (21) est fermement fixée à l'arbre rotatif (1), dans lequel la partie de couverture (21) recouvre un côté supérieur d'une partie de support rotatif (11) positionnée sur un côté d'extrémité inférieure de l'arbre rotatif (1),
    la partie de support inférieure (11) sur le côté de la partie montante (42) présentant un rayon de courbure supérieure à un rayon de courbure de la partie couvrante (21) est formée plus haut que, ou à la même hauteur que, la partie de couverture (21),
    la partie plus haute n'est pas en contact avec un côté extérieur du côté supérieur à l'extérieur de la partie de couverture (21),
    la partie de même hauteur est plus longue que le côté extérieur sur une base de l'axe central oscillant (420) de l'arbre rotatif (1), et ensuite
    la partie montante (42) et la partie de support inférieure (11) sont détachées de la partie de couverture (21) dans une direction verticale et dans une direction horizontale dans une phase de la table (4) transférant la palette (P, P').
     
    9. Appareil de changement de palette selon la revendication 1,
    dans lequel une partie de couverture mobile (21) est fermement fixée à l'arbre rotatif (1),
    dans lequel une partie de couverture fixe (22) recouvrant un côté supérieur d'une partie de support rotative (11) positionnée sur un côté d'extrémité inférieur de l'arbre rotatif (1) est agencée sous la partie de couverture mobile (21), et
    la partie de support inférieure (11) sur le côté de la partie montante (42) présentant un rayon de courbure supérieur à un rayon de courbure de la partie de couverture mobile (21) et la partie de couverture fixe (22) est formée plus haut que, ou à la même hauteur que, la partie de couverture mobile (21) et la partie de couverture fixe (22),
    la partie supérieure n'est pas en contact avec un côté extérieur sur le côté supérieur à l'extérieur de la partie de couverture mobile (21) et de la partie de couverture fixe (22),
    la partie de même hauteur est plus longue que le côté extérieur sur une base de l'axe central oscillant (420) de l'arbre rotatif (1), et ensuite
    la partie montante (42) et la partie de support inférieure (11) sont détachées de la partie de couverture mobile (21) et la partie de couverture fixe (22) dans une direction verticale et dans une direction horizontale dans une phase de la table (4) transférant la palette (P, P').
     




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    Cited references

    REFERENCES CITED IN THE DESCRIPTION



    This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.

    Patent documents cited in the description