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(11) | EP 1 101 579 A2 |
| (12) | EUROPEAN PATENT APPLICATION |
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| (54) | Method and apparatus for stripping |
| (57) Pins (31) corresponding to a product portion of a punched sheet (11) are moved to
an upper retreat position (18) with interference pins (151) interfering with a residue
portion of the punched sheet (11) by elevating a template (7) for the product portion,
pins (41) corresponding to the residue portion of the punched sheet (11) are moved
to a lower retreat position (19) with interference pins (152) interfering with the
product portion of the punched sheet (11) by descending a template (8) for the residue
portion, the punched sheet (11) is placed on pins (16) for product, and the residue
portion of the punched sheet (11) is punched as to be separated from the product portion
by relative closing movement of an upper die (1) and a lower die (2). |
[0002] Conventionally, as a method for removing unnecessary residue portion from a punched sheet leaving a product portion, a method in which a worker knocks off the residue portion with a wooden hammer, a plastic hammer, etc. to remove the residue portion. However, in this punch working by man power, the working itself is hard and working efficiency is low because much labor is required and high stress works on the arms and the waist of the worker.
[0003] Therefore, a residue removing apparatus with which the removing work of the residue portion is conducted mechanically has been used. For example, in a residue removing apparatus of pin board type, an upper die on which many pin holes are disposed in matrix is ascended and descended to a lower die on which a sheet is placed, and the residue portion is separated and removed from the product portion by pushing the residue portion with pins remaining on the upper die corresponding to positions of the residue portion of the sheet.
[0004] However, in the conventional residue removing apparatus described above, for protecting the product portion in removing the residue portion, it is necessary to detect and remove the pins which are on the border of the product portion and the residue portion and may contact fine complicated parts of the product portion beforehand. And, this removal is conducted by manual work.
[0005] It is quite difficult and inefficient to find the unnecessary pin (which may damage the product portion) even for a skilled worker. Especially, in a case of small-amount production of various products, improvement of working efficiency is required.
[0006] It is therefore an object of the present invention to provide a residue removing method and a residue removing apparatus with which the residue portion can be separated and removed from the product portion without damaging the product portion, and especially, pins (which may damage the product portion) are automatically removed before the punching without high skills of workers.
[0007] This object is solved according to the present invention by residue removing method and residue removing apparatus including features of claim 1, 2, 3, or 7. Furthermore detailed embodiments are described in the dependent claims 4, 5, 6, and 8.
[0008] The present invention will be described with reference to the accompanying drawings in which:
Figure 1 is a front view showing a main construction of a residue removing apparatus of the present invention;
Figure 2 is a front view showing a state in which a template for a product portion and a template for a residue portion are moved up and down;
Figure 3 is a front view showing a state in which a sheet is placed on pins for product;
Figure 4 is a top view showing a state in which upper die pins stopped on a pin board of an upper die;
Figure 5 is a cross-sectional view of the upper die showing a stopped state of the upper die pins;
Figure 6 is a plane view of a sheet;
Figure 7 is a development of the template for the product portion;
Figure 8 is a development of the template for the residue portion;
Figure 9 is an enlarged partial view of the template for the product portion;
Figure 10 is an enlarged partial view of the template for the residue portion; and
Figure 11 is an explanatory view of a conveying device.
[0009] Preferred embodiments of the present invention will now be described with reference to the accompanying drawings.
[0010] Figure 1 through Figure 3 show a fundamental construction and working of a residue removing apparatus with which a residue removing method of the present invention is conducted. Mark 1 is an upper die, 2 is a lower die, 3 indicates upper die pins for punching (referred as the upper die pins below) held by the upper die 1 as to be movable in vertical direction and fixable, 4 indicates lower die pins for punching (referred as the lower die pins below) held by the lower die 2 as to be movable in vertical direction and fixable. The upper die 1 and the lower die 2, guided by guiding rods 5 and 6, are driven to elevate by a driving device not shown in Figures. And, 7 is a template 7 for product portion and 8 is a template 8 for residue portion. Both of the template 7 and 8, guided by guiding rods 9 and 10, are driven to elevate at the same time to the upper die 1 and the lower die 2 by a driving device not shown in Figures.
[0011] With the construction above, as shown in Figure 2, among the upper die pins 3, pins 31 which contact a template main body 71 (refer to Figure 7) corresponding to a product portion 12 of a punched sheet (referred as the sheet below) 11 (refer to Figure 6) are moved to an upper retreat position 18 with interference pins 151 interfering with a residue portion 13 of the sheet 11 by elevating the template 7 for product portion, and only pins 17 for residue, not interfering with the product portion 12, can be left on a working position 28 of the upper die 1.
[0012] On the other hand, pins 41 corresponding to the residue portion, which contact a template main body 81 (refer to Figure 8) corresponding to the residue portion 13 of the sheet 11 are moved to a lower retreat position 19 with interference pins 152 interfering with the product portion 12 of the sheet 11 by descending the template 8 for residue portion, and only pins 16 for product, not interfering with residue portion 13, can be left on a working position 29 of the lower die 2.
[0013] After that interference pins 15 (151 and 152), interfering with the both of the product portion 12 and the residue portion 13, are divided and retreated to the upper retreat position 18 (of the upper die 1) and the lower retreat position 19 (of the lower die 2) respectively, as shown in Figure 3, plural sheets 11 are layered on the pins 16 for product, the upper die 1 is descended, and the residue portion 13 of the sheet 11 is separated and removed from the product portion 12 by the pins 17 for residue not interfering with the product portion 12. Therefore, the product portion 12 is obtained flawless, with small number of production processes and good efficiency.
[0014] And, an upper half and a lower half of the guiding rod 9 and 10 are respectively formed into screws (not shown in Figures) turning in opposite directions each other, and the template 7 for product portion and the template 8 for residue portion are ascended and descended simultaneously thereby. And, marks 26 in Figure 3 show end receiving members for receiving ends of the sheet 11 to prevent the sheet 11 from drooping. When the sheet 11 receives impact from the pins 17 for residue, lower parts of the end receiving members turn outward and release the ends of the sheet 11.
[0015] To explain the whole apparatus in further detail, the upper die 1, for example, as shown in Figure 4 and Figure 5, a cross-sectional view at X-X line of Figure 4, is composed of two pin boards B1, on which many pin holes H1 are formed, layered as to relatively slide. The pin holes H1 of large diameter are disposed alternately with the pin holes H1 of small diameter, average diameter of the pin holes H1 is set to be relatively small, and intervals between the pin holes H1 are relatively small. And, in Figure 5, 42 is a stop ring to set limitation of the elevation of the upper die pin 3.
[0016] As described above, the apparatus can correspond to complicated configuration of the product portion 12 (and the residue portion 13) such as small gaps, small holes, etc. with flexibility by setting average diameter of the upper die pins 3 which fit to the pin holes H1 relatively small, and punching accuracy is remarkably improved. And, although not shown in Figures, the pin holes H1 formed on the pin board B1 may be disposed in a pattern in which a zigzag pattern and a parallel pattern are combined, or at random.
[0017] Notched grooves 21 and 22 for hitching to each of the pin holes H1 are respectively formed on an upper portion and a lower portion of the upper die pin 3 fitting to each of the pin holes H1, the upper notched groove 21 and the lower notched groove 22 are hitched to the pin holes H1 offset each other at the same time by sliding the both pin boards B1, and each of the upper die pins is certainly held at the upper retreat position 18 or the working position 28 (refer to Figure 2 or Figure 3). And, each of the pin holes H1 of the pin board B1 disposed on the upper side is provided with an escape hole portion S protruding outward (in sliding direction) as the notched grooves 21 and 22 can be hitched to the large and small pin holes H1 at the same time without gaps (refer to Figure 4).
[0018] In an initial state, the upper die pins 3 are suspended from the upper die with the upper notched grooves 21 hitched to the pin holes H1 of the both pin boards B1, and a positioning member (not shown in Figures) corresponding to upper parts of the upper die pins 3 is provided as lower ends of the upper die pin 3 are arranged to be horizontal. And, as described above, as shown in Figure 5, the template 7 for product is elevated, the pins 31 corresponding to the product portion are moved to the upper retreat position 18 with the interference pins 151, and the lower notched grooves 22 are hitched to the pin holes H1 of the both pin boards B1.
[0019] And, among the upper die pins 3, the level of the lower ends of the upper die pins 3 of large diameter may be set to be different from the level of the lower ends of the upper die pins 3 of small diameter on the working position 28, the lower ends of the large upper die pins 3 (the pins 17 for residue) may be slightly protruded from the level of the lower ends of the small upper die pins 3 (the pins 17 for residue) as to contact the residue portion 13 of the sheet 11 with a small time-rag between the large and small upper die pins, and the pins can be prevented from breaking thereby.
[0020] On the other hand, the lower die 2, as shown in Figure 11, is composed of two pin boards B2, on which many pin holes H2 are formed, layered as to relatively slide. The pin holes H2 of large diameter are disposed alternately with the pin holes H2 of small diameter, average diameter of the pin holes H2 is set to be relatively large, and intervals between the pin holes H2 are relatively large.
[0021] As described above, rigidity and strength of the pin boards B2 are easily improved by setting the intervals between the pin holes H2 relatively large. A part or the whole of the pin hole H2 formed on the lower die 2 is disposed on a position not corresponding to a part or the whole of the pin hole H1 formed on the upper die 1 in a plane view. And, although not shown in Figures, the pin hole H2 on the pin board B2 disposed on an upper side is provided with an escape hole portion similar to that of the pin board B1 of the upper die 1 (refer to Figure 4).
[0022] And, the product portion 12 is prevented from being damaged because the product portion 12 can be supported with a large area for setting average diameter of the lower die pins 4 fitting to the pin holes H2 relatively large. And, although not shown in Figures, the pin holes H2 formed on the pin board B2 may be disposed in a pattern in which a zigzag pattern and a parallel pattern are combined or at random.
[0023] Notched grooves 23 and 24 are respectively formed on an upper portion and a lower portion of the lower die pin 4 fitting to each of the pin holes H2 similar to the upper die pin 3, each of the lower portions of the lower die pins 4 is elastically pushed upward by a coil spring 32 (or a gas spring, an air cylinder, etc. not shown in Figures) as an elastic pushing means, and a positioning member (not shown in Figures) corresponding to the lower portions of the lower die pins 4 is provided to arrange upper ends of the lower die pins 4 horizontal. And, a crank arm may be used other than the elastic pushing means.
[0024] And, as described above, the pins 41 corresponding to the residue portion are pushed down by the template 8 for the residue portion and moved to the lower retreat position 19 with the interference pins 152, and the notched groove 23 of the upper portion is hitched to the pin holes H2 on the both pin boards B2 offset each other.
[0025] Figure 6 shows an example of the sheet 11 which is an object of punch work. In the sheet 11, cutting work for punching is already conducted on a border line of the product portion 12 and the residue portion 13 (shown with a continuous line) in cutting process separately provided. And, broken lines 14 show folded position. And, the configuration of the sheet 11 is not restricted to the configuration in Figure 6.
[0026] The template 7 for the product portion, for example, as shown in Figure 7, is composed of a template main body 71 corresponding to the product portion 12 of the sheet 11, and a pair of pin boards b1 connected with hinges 33 as to freely open and close to sandwich the template main body 71. Pin holes h1 are formed on the both pin boards b1 in the same disposition pattern as that of the pin holes H1 on the pin boards B1 of the upper die 1. The both pin boards b1, closed and sandwiching the template main body 71, are supported by a supporting frame 35 (refer to Figure 1), to which the screws of the guiding rods 9 and 10 screw, in use. And, although not shown in Figures, a positioning means such as protruding pins for positioning the template main body 71 is provided.
[0027] The template 8 for the product portion, for example, as shown in Figure 8, is composed of a template main body 81 corresponding to the residue portion 13 of the sheet 11, and a pair of pin boards b2 connected with hinges 33 as to freely open and close to sandwich the template main body 81. Pin holes h2 are formed on the both pin boards b2 in the same disposition pattern as that of the pin holes H2 on the pin boards B2 of the lower die 2. The both pin boards b2, closed and sandwiching the template main body 81, are supported by a supporting frame 36 (refer to Figure 1), to which the screws of the guiding rods 9 and 10 screw, in use. And, although not shown in Figures, a positioning means such as protruding pins for positioning the template main body 81 is provided.
[0028] Figure 9 is an enlarged view of the template 7 for the product portion for explanation of the interference pins 151 interfering with the residue portion 13 of the sheet 11. When the template 7 for the product portion is ascended, the interference pins 151 (not shown in Figure 9) interfering with the residue portion 13 fit to the pin holes (h1) which partially jut out of the template main body 71, and the interference pins 151 are moved to the upper retreat position 18 with the pins 31 corresponding to the product portion (refer to Figure 2).
[0029] Figure 10 is an enlarged view of the template 8 for the residue portion for explanation of the interference pins 152 interfering with the product portion 12 of the sheet 11. When the template 8 for the residue portion is descended, the interference pins 152 interfering with the product portion 12 fit to the pin holes (h2) which partially jut out of the template main body 81, and the interference pins 152 are moved to the lower retreat position 19 with the pins 41 corresponding to the residue portion (refer to Figure 2).
[0030] Figure 11 is an explanatory view of a device for conveying the product portion 12 after the punch work. A stop ring 43 which contacts the lower face of the pin board B2 on the lower side of the lower die 2 is attached to the lower portion of the lower die pin 4 to regulate limitation of the elevation of the lower die pin 4. And, the product portion 12 separated from the residue portion 13 is placed on the pins 16 for product on a position of elevation limit, namely, the working position 29 (of the lower die 2) as shown in Figure 11.
[0031] And, the product portion 12 is raised by a rake-shaped conveying arm 27 of the conveying device (not shown in Figures in detail) and conveyed to the outside. The conveying arm 27 is, for example, constructed as to extend and contract in horizontal direction, and elevate in vertical direction with a combination of an oil-hydraulic or pneumatic driving source and an electric driving source.
[0032] The present invention, not restricted to the embodiment described above, can be modified within the scope of the invention.
[0033] According to the residue removing apparatus and method of the present invention, the residue portion 13 can be separated and removed from the product portion 12 with small number of production processes and good efficiency without damaging the product portion 12 because the residue portion 13 of the sheet 11 is punched to be separated from the product portion 12 with the pins 17 for residue not interfering with the product portion 12 of the sheet 11 and left on the working position 28 of the upper die 1, and the pins 16 for product not interfering with the residue portion 13 and left on the working position 29 of the lower die 2 by separately moving the interference pins 151 interfering with the residue portion 13 to the upper retreat position 18, and the interference pins 152 interfering with the product portion 12 to the lower retreat position 19.
[0034] And, when the interference pins 15 are chosen, a complicated process, in which the pins 3 and 4 are handed over (conveyed or transferred) between the upper die 1 and the lower die 2, can be omitted, and punching is conducted swiftly.
[0035] And, according to the residue removing apparatus, freedom of design of the upper die 1 and the lower die 2 is remarkably improved, and the upper die pin 3 which punches the residue portion 13 and the lower die pin 4 which receives the product portion 12 are set to have the optimum diameter and disposed appropriately.
[0036] And, the product portion 12 is supported with a large area by setting the average diameter of the lower die pins 4 large, the punch work is conducted with a stable supporting state, and the product portion 12 is hardly damaged thereby. And, portions of small area of the residue portion 13 are punched with good accuracy by setting the average diameter of the upper die pins 3 small, the separation becomes certain, and punching accuracy of the product portion 12 is remarkably improved.
[0037] And, the interference pins 15 (151, 152) are rapidly selected and moved to the upper retreat position 18 and the lower retreat position 19 because the template 7 for the product portion and the template 8 for the residue portion are simultaneously ascended and descended. Further, the upper die pins 3 and the lower die pins 4 can be hitched to the pin holes H1 and H2 by sliding the pin boards B1 and B2 relatively, holding of the pins 3 and 4 at the working positions 28 and 29, the upper retreat position 18, an the lower retreat position 19, etc. is made rapid and certain, and efficiency of the punch work is improved thereby.
1. A residue removing method comprising the steps of :
holding upper die pins (3) for punching by an upper die (1) as to be movable vertically and fixable;
holding lower die pins (4) for punching by a lower die (2) as to be movable vertically and fixable;
leaving only pins (17) for residue not interfering with a product portion (12) on a working position (28) of the upper die (1) by moving pins (31), among the upper die pins (3), corresponding to the product portion (12) of a punched sheet (11) and interference pins (151) interfering with residue portion (13) of the sheet (11) to an upper retreat position (18) with ascending a template (7) for the product portion disposed between the upper die (1) and the lower die (2) as to be elevated;
leaving only pins (16) for product not interfering with the residue portion (13) on a working position (29) of the lower die (2) by moving pins (41), among the lower die pins (4), corresponding to the residue portion (13) of the sheet (11) and interference pins (152) interfering with the product portion (12) of the sheet (11) to a lower retreat position (19) with descending a template (8) for the residue portion disposed between the upper die (1) and the lower die (2) as to be elevated;
placing the sheet (11) on the pins (16) for product; and
punching the residue portion (13) of the sheet (11) by relative closing of the upper die (1) and the lower die (2) as to be separated from the product portion (12).
2. A residue removing apparatus comprising an upper die (1), a lower die (2), upper die
pins (3) held by the upper die (1) as to be vertically movable and fixable only to
the upper die (1), and lower die pins (4) held by the lower die (2) as to be vertically
movable and fixable only to the lower die (2).
3. A residue removing apparatus comprising an upper die (1) holding upper die pins (3)
for punching as to be vertically movable and fixable, a lower die (2) holding lower
die pins (4) for punching as to be vertically movable and fixable, a template (7)
for product portion, disposed between the upper die (1) and the lower die (2), which
contacts pins (31), among the upper die pins (3), corresponding to a product portion
(12) of a punched sheet (11) to move the pins (31) corresponding to the product portion
and interference pins (151) interfering with a residue portion (13) of the sheet (11)
to an upper retreat position (18), and a template (8) for residue portion, disposed
between the upper die (1) and the lower die (2) which contacts pins (41), among the
lower die pins (4), corresponding to the residue portion (13) of the sheet (11) to
move the pins (41) corresponding to the residue portion (13) and interference pins
(152) interfering with the product portion (12) of the sheet (11) to a lower retreat
position (19).
4. The residue removing apparatus as set forth in claim 3, wherein a part of or the whole
pin hole (H1) formed on the upper die (1) and a part of or the whole pin hole (H2) formed on the lower die (2) are disposed as not to correspond each other in a top
view.
5. The residue removing apparatus as set forth in claim 3 or claim 4, wherein average
diameter of the lower die pins (4) is set to be large, and average diameter of the
upper die pins (3) is set to be small.
6. The residue removing apparatus as set forth in claim 3 or claim 4, wherein the upper
die (1) is composed of two pin boards (B1) layered as to be relatively slidable each other, the lower die (2) is composed of
two pin boards (B2) layered as to be relatively slidable each other, and each of notched grooves (21,
22, 23, 24) for hitching to the pin boards (B1, B2) is formed on each of an upper portion and a lower portion of the upper die pin (3)
and the lower die pin (4).
7. A residue removing apparatus comprising an upper die (1) holding upper die pins (3)
for punching as to be vertically movable and fixable, a lower die (2) holding lower
die pins (4) for punching as to be vertically movable and fixable, average diameter
of the upper die pins (3) formed to be small, average diameter of the lower die pins
(4) formed to be large, a stop ring (42), provided to the upper die pin (3), which
contacts the upper die (1) to regulate elevation limit, a stop ring (43), provided
to the lower die pin (4), which contacts the lower die (2) to regulate elevation limit,
a template (7) for product portion, disposed between the upper die (1) and the lower
die (2), which contacts pins (31), among the upper die pins (3), corresponding to
a product portion (12) of a punched sheet (11) to move the pins (31) corresponding
to the product portion and interference pins (151) interfering with a residue portion
(13) of the sheet (11) to an upper retreat position (18), and a template (8) for residue
portion, disposed between the upper die (1) and the lower die (2) which contacts pins
(41), among the lower die pins (4), corresponding to the residue portion (13) of the
sheet (11) to move the pins (41) corresponding to the residue portion and interference
pins (152) interfering with the product portion (12) of the sheet (11) to a lower
retreat position (19).
8. The residue removing apparatus as set forth in claim 2 or claim 7, wherein screw is
formed on each of an upper half and a lower half of each of guiding rods (9, 10) guiding
the upper die (1) and the lower die (2), the screws have opposite directions, the
template (7) for product portion and the template (8) for residue portion are ascended
and descended at the same time by driving the guiding rods (9, 10) in one direction,
the upper die (1) is composed of two pin boards (B1) layered as to be relatively slidable each other, the lower die (2) is composed of
two pin boards (B2) layered as to be relatively slidable each other, and each of notched grooves (21,
22, 23, 24) for hitching to the pin boards (B1, B2) is formed on each of an upper portion and a lower portion of the upper die pin (3)
and the lower die pin (4).