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EP 0 038 199 B1 |
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EUROPEAN PATENT SPECIFICATION |
(45) |
Mention of the grant of the patent: |
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25.07.1984 Bulletin 1984/30 |
(22) |
Date of filing: 10.04.1981 |
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(51) |
International Patent Classification (IPC)3: B21D 28/12 |
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Turret punch press
Presse mit Revolverkopf
Presse rotative
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Designated Contracting States: |
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DE FR GB IT NL SE |
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Priority: |
10.04.1980 GB 8011932 22.12.1980 EP 80304681
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Date of publication of application: |
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21.10.1981 Bulletin 1981/42 |
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Applicant: Joseph Rhodes Limited |
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Wakefield
West Yorkshire WF1 5EQ (GB) |
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Inventor: |
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- Nobles, John
Slough
Berkshire SL1 1EL (GB)
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(74) |
Representative: Wilson, Nicholas Martin |
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WITHERS & ROGERS
4 Dyer's Buildings
Holborn London EC1N 2JT London EC1N 2JT (GB) |
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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).
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[0001] This invention relates to an improved turret punch press.
[0002] In punch presses incorporating turrets, such as in our British Patent No. 1420594,
it has normally always been the practice for the lower turret forming a die holder
for the dies to be formed with a plurality of holes of different sizes which receive
the dies. However, such an arrangement means that the turret is not able to accept
different types of die tooling.
[0003] Another proposal of punch press is disclosed in GB-A-1183871 in which spaced upper
and lower turrets are provided for punch and die tooling respectively. The turrets
have a plurality of stations and means are provided for loading the tooling into the
respective turrets and ejecting it therefrom.
[0004] In US-A-4096774 there is disclosed a turret punch press in which the die tooling
is received in a plurality of segments attached to a turret by means of projectable
T headed members and properly aligned relative to the upper turret by a plurality
of locating pins which project through the segments and into engagement with the turret.
[0005] A further turret punch press is disclosed in US-A-4165669 in which tooling carrying
modules are cantilevered from a central turret section in spoke-like fashion. The
modules are adapted to carry one or more punch or die tools and at the work station
an anvil is provided so that the tools are firmly positioned during punching.
[0006] According to the present invention there is provided a turret punch press comprising
a frame having an upper member and a lower member, an upper turret having a plurality
of turret stations for punches supported by the upper member, and a lower turret having
a plurality of turret stations for dies, said lower turret having upper and lower
surfaces and a plurality of slug holes formed therethrough for punched slugs to drop
through, one slug hole being provided for each turret station characterised in that
each turret station of the lower turret is defined by a step in the upper surface
of the turret to provide a datum face extending axially of the turret and a radial
support surface between the datum face and the periphery of the turret and in which
the slug holes are formed.
[0007] The invention also includes a turret punch press comprising a turret punch press
comprising a frame having an upper member and a lower member, an upper turret for
punches supported by the upper member, and a lower turret for dies supported by the
lower member characterised in that the lower turret has its circumference rebated
to provide a plurality of datum faces against which die assemblies may be received,
each die assembly comprising a die holder means for releasably securing the die holder
against the datum face on the lower turret and the die being releasably received within
the die holder.
[0008] Preferably the means for releasably securing the die holder on the lower turret comprises
a groove on the die holder which is cooperable with an angularly movable, eccentric
locking head of a retainer on the turret.
[0009] The die holder may include an O-ring for engaging the die and retaining it by a friction
fit.
[0010] The main advantage of the present invention is that the lower turret no longer determines
the shape of die to be received. This, by providing a die holder, which services as
an adaptor, different types of die may be received on the same turret whereas previously
only tooling specially designed for a particular machine could be used.
[0011] The invention will now be described by way of example with reference to the accompanying
drawings in which:
Figure 1 is a side elevation of a punch press having a C-shaped frame with the workpiece
positioning assembly omitted for clarity;
Figure 2 is a plan view of the lower limb of the punch press shown in figure 1 with
the lower turret shown diagrammatically and partially broken away but including the
workpiece positioning assembly;
Figure 3 is a side elevation of a preferred die assembly;
Figure 4 is a plan view of a preferred lower turret; and
Figure 5 is a section on A-A of figure 4.
[0012] In the drawings a punch press comprises a frame 1 of C-shape, having upper and lower
limbs 2 and 3 defining a throat 4. A workpiece positioning assembly (figure 2) on
the press for supporting a sheet workpiece for two dimensional displacement relative
to a punch station of the punch press comprises a first traverse 5 forming the Y-axis
fixed to the frame 1 and a second traverse 6 forming the X-axis supported for movement
along the Y-axis traverse 5.
[0013] The Y-axis traverse 5 comprises two horizontally-spaced rails 7, one secured to each
side of the lower limb 3 of the punch press frame 1. Extending parallel to the rails
7, and secured on one side only of the lower limb, is a leadscrew 8 driven, via a
belt connection 9, by a DC Servo Motor 10. The rails 7 are not secured directly to
the frame but, as shown, are disposed on an intermediate mounting member 11 and these
extend forwardly and rearwardly from the back of the throat 4 as clearly seen from
figure 2.
[0014] The X-axis traverse comprises an elongate beam 12 of U-shaped cross-section and having
a lattice of cross-ties 13 for strength. Secured along the lower front edge of the
beam 12 is a single bearing rail 14 for supporting a workpiece carriage 15. The workpiece
carriage 15 includes two workpiece clamps (not shown) and is movable along the second
traverse by means of a driving connection with a driven leadscrew 16.
[0015] As seen from figure 2 the driven leadscrew 16 is also driven by a DC Servo Motor
17 via a belt connection 18. The belt connections 9 and 18 enable the respective motors
10 and 17 to be positioned alongside the respective leadscrews rather than at one
end thereby producing a more compact arrangement.
[0016] Extending rearwardly from the main beam 12 of the X-axis traverse are two support
extensions 19 which engage with the rearward extensions of rails 7 and enable the
traverse to be withdrawn right to the back of the throat whilst maintaining rigidity.
[0017] Although the workpiece positioning assembly described is preferred and is the subject
of our copending European Application No. 80304681.2 the present invention is applicable
to a turret punch press having any form of suitable workpiece positioning assembly.
Thus, the X and Y axes may each include two parallel vertically spaced tracks as disclosed
in our prior British Patent No. 1563921. Alternatively the Y-axis traverse could be
mounted upon the upper limb of the frame 1. Moreover, although leadscrews 8 and 16
have been illustrated by way of example, rack and pinion drive means may be provided
if desired - see for example U.S. Patent No. 3563123.
[0018] Referring once again to figure 1 it will be seen that the free end of the upper limb
2 supports a hydraulic ram assembly 50 and an upper turret 21. The hydraulic ram assembly
50 is supplied with hydraulic fluid from a reservoir (not shown) and flow is controlled
by a hydraulic manifold 51. The hydraulic fluid passes to the ram assembly 50 through
hydraulic pressure pipe 52 and fluid returns on ram retraction through pipe 53.
[0019] The upper turret 21 is provided with roller chain drive 22 for rotating the turret
into a desired angular position to bring a desired punch below the operative position
of the hydraulic ram assembly 50. The workpiece may be locked in position for clamp
reposition by means of a pair of retractable clamping mechanisms 23 (only one shown)
the operation of which is controlled by reposition solenoid 54.
[0020] Disposed below the upper turret 21, on the lower limb 3, is the lower turret 24 shown
in detail in figures 4 and 5. The figures show that the lower turret 24 has upper
and lower surfaces 70, 71 and each turret station is defined by a step in the upper
surface 70 of the turret providing a datum face 41 extending axially of the turret
and a radial support surface 72 extending between the datum face 41 and the periphery
of the turret. At each turret station of the lower turret 24 a slug hole 45 is provided
for punched slugs to drop through. The lower turret 24 also has a roller chain drive
25 and the two chains for the respective upper and lower turrets 21, 24 are connected
to a common turret drive shaft 55 driven by a single drive motor 56 so that the movement
of the two turrets are synchronised: a turret clutch/brake for the drive shaft 55
is provided at 57.
[0021] Disposed at the front of the machine, and on each of the upper and lower limbs 2
and 3, are respective upper and lower turret wedge assemblies 58, 59. The wedge assemblies
58, 59 each of which include a reciprocal locking member 60 operated by turret wedge
solenoid 61. In order to determine the position of the locking member 60 respective
pairs of wedge sensors 62, 63 are provided on the upper and lower limbs. The wedge
assemblies 58, 59 lock the respective turrets in position after indexing a desired
punch station by engaging location pins (not shown) on the turret so that, during
punching, the turrets are accurately positioned relative to the hydraulic ram assembly
50. The locking member 60 engage one of a plurality of bull-nosed location pins in
the respective turret as explained more fully below. Also shown in figure 1 are sheet
clamp solenoid 64 and datum pin solenoid 65, neither the workpiece clamps nor the
reciprocal datum plunger being shown in the drawings, the datum plunger being positioned
on the other side of the lower limb 3 from that shown in figure 1.
[0022] The construction of the preferred die assembly is shown in figure 3. The assembly
30 comprises a die holder 31 having two laterally projecting location pins 32 set
at 90° (only one shown) and a locking groove 33. The die holder 31 receives a die
34 having a location pin 35 locating in one of four location slots 36 and retained
in position by frictional engagement with an 0-ring 37 in the die holder 31. The location
pins 32 are offset from the location slots 36 by 45° so that adjustment at 45° intervals
is possible with only four slots.
[0023] In order to prevent upward lifting of the die holder 31 a retainer 38 is provided
which has an eccentric locking head 39 for engagement with locking groove 33. The
die holder 31 is designed to be received in the lower turret 24 (see figures 4 and
5), the die holder being located by one of pins 32 being positioned in a slot 40 in
the datum face 41 of the respective turret station. In use the slot 40 is closed vertically
by means of a permanently set grub screw (not shown). The retainer 38 is loosely received
in an aperture 42 in the turret and has a vertical slot (not shown) joining peripheral
groove 43. The vertical slot and groove 43 cooperate with a locking pin 44 in the
aperture 42 to allow removal of the retainer only when the locking head is released
ie: angular movement of the retainer 38 to release the locking head 39 from the groove
33 enables the locking pin for the retainer to be aligned with the vertical slot.
[0024] As seen from figures 4 and 5 the lower turret, in addition includes holes 46 for
the location pins (not shown) to accurately orientate the turret - equivalent location
pins being provided on the upper turret also: the pins being held in the holes 46
by tapered bushes also not shown. The locking screws 44 pass through holes 47 in the
periphery of the turret.
[0025] Equidistantly spaced about the lower turret 24 (and the upper turret also although
not shown) are six fixing holes 48 by means of which the respective turrets are mounted.
[0026] The arrangement of the lower turret means that by simply changing the die holder
31 different types of die tooling may be received whereas before only custom-made
tooling could be accommodated. Although the datum faces 41 are preferably arcuate
it will be understood that they may be of any other configuration, the die holders
31 being suitably contoured as necessary.
1. A turret punch press comprising a frame (1) having an upper member (2) and a lower
member (3), an upper turret (21) having a plurality of turret stations for punches
supported by the upper member (2), and a lower turret (24) having a plurality of turret
stations for dies (34), said lower turret (24) having upper (70) and lower (71) surfaces
and a plurality of slug holes (45) formed therethrough for punched slugs to drop through,
one slug hole (45) being provided for each turret station characterised in that each
turret station of the lower turret (24) is defined by a step in the upper surface
(70) of the turret to provide a datum face (41) extending axially of the turret and
a radial support surface (72) between the datum face and the periphery of the turret
and in which the slug holes (45) are formed.
2. A turret punch press according to claim 1 characterised in that the datum faces
(41) of the lower turret (24) are of part circular form.
3. A turret punch press according to claim 1 or 2 including a die assembly (30) characterised
in that the die assembly comprises a die holder (31), means (33, 38) for releasably
securing the die holder (31) against a datum face (41) on the lower turret, and a
die (34) releasably received within the die holder (31).
4. A turret punch press comprising a frame (1) having an upper member (2) and a lower
member (3), an upper turret (21) for punches supported by the upper member (2), and
a lower turret (24) for dies (34) supported by the lower member (3) characterised
in that the lower turret (24) has its circumference rebated to provide a plurality
of datum faces (41) against which die assemblies (30) may be received, each die assembly
comprising a die holder (31) means (33, 38) for releasably securing the die holder
(31) against the datum face (41) on the lower turret (24) and the die (34) being releasably
received within the die holder (31).
5. A turret punch press according to claim 4, characterised in that the datum face
(41) of the circumference of the lower turret (24) has a part circular form.
6. A turret punch press according to claim 4 characterised in that the means for releasably
securing the die holder (31) on the lower turret (24) comprises a groove (33) on the
die holder (31) which is cooperable with an angularly movable, eccentric locking head
(39) of a retainer (38) on the turret.
7. A turret punch press according to claim 4 or claim 6 characterised in that the
die holder (31) is circular, has two protruding location pins (32) set at 90° to one
another for cooperation with a datum face (41) of the lower turret (24) and four equally-spaced
location slots (36) offset by 45° from said location pins (32) and the die (34) has
one location pin (35) for cooperation with the location slots in the die holder (31),
adjustment of the location pins (32) enabling the die (34) to be set angularly at
the intervals of 45°.
8. A turret punch press according to any of claims 3 to 7 characterised in that the
periphery of the lower turret (24) is formed with a plurality of holes (46) each of
which receives a location pin which may be engaged by a reciprocal locking member
(60) on the lower member (3) of the frame (1) to lock the lower turret (24) in position
during punching.
1. Poinçonneuse à tourelle comprenant un bâti (1) qui possède un élément supérieur
(2) et un élément inférieur (3), une tourelle supérieure (21) possédant une pluralité
de postes de tourelle pour poinçons, supportée par l'élément supérieur (2), et une
tourelle inférieure (24) possédant une pluralité de postes de tourelle pour matrices
(34), ladite tourelle inférieure (24) présentant des surfaces supérieure (70) et inférieure
(71) et une pluralité de trous de passage de déchets (45) formés à travers ces surfaces,
pour laisser tomber les déchets à travers ces trous, un trou de passage de déchets
(45) étant prévu pour chaque poste de tourelle, caractérisée en ce que chaque poste
de tourelle de la tourelle inférieure (24) est défini par un gradin de la surface
supérieure (70) de la tourelle, pour donner naissance à une face de référence (41)
qui s'étend dans la direction axiale de la tourelle et une surface de support radiale
(72) comprise entre la face de référence et la périphérie de la tourelle et dans laquelle
les trous de passage de déchets (45) sont formés.
2. Poinçonneuse à tourelle selon la revendication 1, caractérisée en ce que les faces
de référence (41) de la tourelle inférieure (24) possédant une forme en arc de cercle.
3. Poinçonneuse à tourelle selon la revendication 1 ou 2, comprenant un ensemble matrice
(30), caractérisée en ce que l'ensemble matrice comprend un porte-matrice (31), des
moyens (33, 38) servant à fixer le porte-matrice (31) contre la face de référence
(41) de la tourelle inférieure de façon démontable et une matrice (34) logée de façon
démontable dans le porte-matrice (31
4. Poinçonneuse à tourelle comprenant un bâti (1) qui possède un élément supérieur
(2) et un élément inférieur (3), une tourelle supérieure (21) destinée aux poinçons,
supportée par l'élément supérieure (2) et une tourelle inférieure (24) destinée aux
matrices (34), supportée par l'élément inférieure (3), caractérisée en ce que la tourelle
inférieure (24) présente sa circonférence surbaissée pour former une pluralité de
faces de référence (41) contre lesquelles des ensembles matrices (30) peuvent être
logés, chque ensemble matrice comprenant un porte-matrice (31), des moyens (33, 38)
servant à fixer le porte-matrice (31) de façon démontable contre la face de référence
(41) prévue sur la tourelle inférieure (24) et la matrice (34) étant logée de façon
démontable dans le porte-matrice (31).
5. Poinçonneuse à tourelle selon la revendication 4, caractérisée en ce que la face
de référence (41) de la circonférence de la tourelle inférieure (24) possède une forme
en arc de cercle.
6. Poinçonneuse à tourelle selon la revendication 4, caractérisée en ce que les moyens
servant à fixer le porte-matrice (31) sur la tourelle inférieure (24) de façon démontable
comprennent une gorge (33) prévue sur le porte-matrice (31) qui peut coopérer avec
une tête de verrouillage excentrique (39) déplaçable augulairement, appartenant à
un élément de retenue (38) de la tourelle.
7. Poinçonneuse à tourelle selon la revendication 4 ou la revendication 6, caractérisée
en ce que le porte-matrice (31) est circulaire, possède deux ergots de positionnement
saillants (32), disposés à 90° l'un de l'autre, pour coopérer avec une face de référence
(41 ) de la tourelle inférieure (24) et quatre encoches de positionnement (36) régulièrement
espacées, décalées de 45° par rapport auxdits ergots de positionnement (32), et en
ce que la matrice (34) possède un ergot de positionnement (35) destiné à coopérer
avec les encoches de positionnement ménagées dans le porte-matrice (31), l'ajustement
des ergots de positionnement (32) permettant de régler la matrice (34) angulairement
par intervalles de 45°.
8. Poinçonneuse à tourelle selon l'une quelconque des revendications 3 à 7, caractérisée
ce que la périphérie de la tourelle inférieure (24) est munie d'une pluralité de trous
(46) dont chacun reçoit un ergot de positionnement qui peut être attaqué par une élément
de verrouillage à mouvement alternatif (60) prévu sur l'élément inférieur (3) du bâti
(1) pour bloquer la tourelle inférieure (24) en position pendant le poinçonnage.
1. Presse mit Revolverkopf mit einem Rahmen (1) aus einem oberen Teil (2) und einem
unteren Teil (3), mit einem mit einer Vielzahl von Aufnahmen für Oberstempel versehenen
und an dem oberen Teil (2) gehaltenen oberen Revolverkopf (21) und mit einem mit einer
Vielzahl von Aufnahmen, für Unterstempel (34) versehenen unteren Revolverkopf (24),
welcher obere (70) und untere (71) Außenflächen und eine Vielzahl von durchgeformten
Butzenlöchern (45) zum Hindurchfallen von ausgestanzten Butzen hat, wobei für jede
Aufnahme ein Butzenloch (45) vorgesehen ist, dadurch gekennzeichnet, daß jede Aufnahme
des unteren Revolverkopfes (24) durch eine Stufe in der oberen Außenfläche (70) des
Revolverkopfs definiert ist, um eine sich in axialer Richtung des Revolverkopfs erstreckende
Bezugsfläche (41) und eine radiale Stützfläche (72) zwischen der Bezugsfläche und
dem Umfang des Revolverkopfs vorzusehen, in die die Butzenlöcher (45) eingeformt sind.
2. Presse nach Anspruch 1, dadurch gekennzeichnet, daß die Bezugsflächen (41) des
unteren Revolverkopfs (24) kreisabschnittförmit sind.
3. Presse nach Anspruch 1 oder 2 mit einer Unterstempel-Baugruppe (30), dadurch gekennzeichnet,
daß die Unterstempel-Baugruppe einen Stempelhalter (31), Einrichtungen (33, 38) zum
lösbaren Sichern des Stempelhalters (31) gegen eine Bezugsfläche (41) auf dem unteren
Revolverkopf und einen Unterstempel (34) enthält, der lösbar im Stempelhalter (31
) aufgenommen ist.
4. Presse mit Revolverkopf mit einem Rahmen (1) aus einem oberen Teil (2) und einem
unteren Teil (3), mit einem an dem oberen Teil (2) gehaltenen oberen Revolverkopf
(21) für Oberstempel und mit einem an dem unteren Teil (3) gehaltenen unteren Revolverkopf
(24) für Unterstempel (34), dadurch gekennzeichnet, daß der Umfang des unteren Revolverkopfs
(24) abgesetzt ist, um eine Vielzahl von Bezugsflächen (41) zu schaffen, gegen die
Unterstempel-Baugruppen (30) aufgenommen werden können, wobei jede Baugruppe einen
Stempelhalter (31), Einrichtungen (33, 38) zum lösbaren Sichern des Stempelhalters
(31) gegen die Bezugsfläche (41) auf dem unteren Revolverkopf (24) enthält, und daß
der Unterstempel (34) lösbar im Stempel-halter (31) aufgenommen wird.
5. Presse nach Anspruch 4, dadurch gekenn-' zeichnet, daß die Bezugsfläche (41) des Umfanges des unteren Revolverkopfs (24) kreisabschnittförmig
ist.
6. Presse nach Anspruch 4, dadurch gekennzeichnet, daß die Einrichtung zum lösbaren
Befestigen des Stempelhalters (31) auf dem unteren Revolverkopf (24) eine an dem Stempel-
halter (31) angeordnete Nut (33) enthält, welche mit einem drehwinkelig bewegbaren,
exzentrischen Schließkopf (39) eines Befestigungsteils (38) auf dem Revolverkopf zusammenwirken
kann.
7. Presse nach Anspruch 4 oder 6, dadurch gekennzeichnet, daß der Stempelhalter (31)
kreisförmig ist, zwei vorspringende Ausrichtbolzen (32) aufweist, die gegeneinander
um 90° versetzt sind zum Zusammenwirken mit einer Bezugsfläche (41) des unteren Revolverkopfs
(24) und vier im gleichen Abstand angeordnete Ausrichtschlitze (36) hat, die gegenüber
den Ausrichtbolzen (32) um 45° versetzt sind, und daß der Unterstempel (34) einen
Ausrichbolzen (35) aufweist zum Zusammenwirken mit den Ausrichtschlitzen des Stempelhalters
(31), wobei es die Ausrichtung der Ausrichtbolzen (32) erlaubt, den Unterstempel (34)
in Winkelabständen von 45° anzuordnen.
8. Presse nach einem der Ansprüche 3 bis 7, dadurch gekennzeichnef, daß der Umfang
des unteren Revolverkopfs (24) mit einer Vielzahl von Löchern (46) versehen ist, von
denen jedes einen Ausrichtbolzen aufnimmt, der durch eine hin und herbewegbares Arretierteil
(60) auf dem unteren Teil (3) des Rahmes (1) in Eingriff bringbar ist, un den unteren
Revolverkopf (24) während des Stanzens in seiner Position zu arretieren.