JP2013018070A - Support plate for blanking - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a support plate for blanking by means of which excellent sharpness of a blanking blade is secured even if the contact of the blanking blade has some unevenness.SOLUTION: The support plate 10 for blanking is used pairing with a blanking die 9 formed by being implanted with a blanking blade 9b, and supports the blanking blade 9b when blanking a material sheet by the blanking die 9. The support plate 10 for blanking includes a resin plate 10a having on a front surface side, a plate face on which the blanking blade 9b is made to butt, a base plate 10b supporting the resin plate 10a from the rear face side thereof, and a fastener 12 fastening the resin plate 10a to the base plate 10b.

Description

  The present invention relates to a punching receiving plate used as a pair with a punching die for punching a material sheet such as a plastic film.

Conventionally, a plastic film superimposed on a plurality of layers is intermittently fed in the length direction, and heat sealing is performed using a heat sealing device for each intermittent feed, and the plastic film is further cut by a cutting blade to form a rectangular shape. There exists what manufactured the plastic bag (refer patent document 1).
In order to increase the production efficiency of such a plastic bag, it is conceivable to perform a punching process using a punching die (see Patent Document 2) on the plastic film.

JP 2002-178418 A JP-A-8-141999

  In the above punching process, a punching receiving plate is used so as to make a pair with a punching die in which a punching blade is implanted on a mold substrate. The punching receiving plate serves to receive the punching blade during the punching process.

By the way, in order to uniformly punch the plastic film fed onto the punching receiving plate, the cutting edges of the punching blades must be aligned at the same level.
However, in general, the punching blade is manually implanted into the mold substrate, so that a slight irregularity is inevitably generated.
For this reason, there is a problem in that spots are generated on the edge of the punching blade, resulting in poor sharpness.

  The present invention has been made in view of the above-described problems, and provides a punching backing plate that can ensure a good sharpness even if there is some unevenness per edge of the punching blade. It is the purpose.

In order to achieve the above object, a punching receiving plate according to the present invention comprises:
A punching receiving plate that is used in a pair with a punching die in which a punching blade is implanted, and that receives the punching blade when punching into a material sheet by the punching die,
A resin plate made of resin having a plate surface on the surface side against which the punching blade is abutted;
A base plate that supports the resin plate from its back side;
A fastener for fastening the resin plate and the base plate;
(First invention).

In the present invention,
It is preferable that an auxiliary plate having a thickness that compensates for a reduction in thickness due to surface grinding of the resin plate is interposed between the resin plate and the base plate (second invention).

In the present invention,
Preferably, the base plate is provided with a rotary bearing portion that engages with a rotation support shaft that rotatably supports the punching receiving plate on a plane (third invention).

In the present invention,
The rotary bearing portion is preferably arranged at an eccentric position deviating from the center position of the base plate (fourth invention).

  According to the present invention, since the punching blade is abutted against the plate surface on the surface side of the resin plate at the time of punching, even if there is some unevenness per blade of the punching blade, the punching blade is absorbed and absorbed. It can bite in and ensure a good sharpness.

  By adopting the configuration of the second invention, even if the surface of the resin plate is ground, the thickness of the punching receiving plate can be kept constant. Therefore, if the thickness changes, the required punching No need to adjust mold pressing force.

  By adopting the configuration of the third invention, since the punching receiving plate can be rotated around the rotary bearing portion, the location where the punching blade is abutted can be changed, and punching can be performed with a constant punching pressure. Can be ensured over a long period of time.

  By adopting the configuration of the fourth invention, the punching receiving plate can be eccentrically rotated around the rotary bearing portion, so that the place where the punching blade is abutted can be changed so as not to overlap as much as possible. It is possible to perform punching with a constant punching pressure for a longer period of time, and a good sharpness can be ensured for a longer period of time.

The front view of the punching apparatus with which the base plate for punching which concerns on one Embodiment of this invention was mounted | worn. FIG. 1B is an enlarged view (a) of FIG. 1, and is a cross-sectional view taken along the line C-C of FIG. ) Is a cross-sectional view taken along the line CC of FIG. State diagram (a) where the surface of the resin plate is scratched, State diagram (b) where the surface of the resin plate is ground and State diagram (c) where an auxiliary plate is inserted

  Next, specific embodiments of the punching receiving plate according to the present invention will be described with reference to the drawings.

  FIG. 1 is a front view of a punching apparatus equipped with a punching receiving plate according to an embodiment of the present invention.

<Description of schematic structure of punching device>
A punching apparatus 1 shown in FIG. 1 is an apparatus that obtains a rectangular punched product by punching a material sheet fed from a material winding roll (not shown) and intermittently fed in the sheet feeding direction.
Here, as the material sheet, for example, a continuous plastic film that can be continuously fed out by being heat-sealed by a heat-sealing device with respect to the plastic film laminated in a plurality of layers can be mentioned. An example of the punched product is a plastic bag.

The punching apparatus 1 includes a bed 3 that is installed on a gantry 2 and serves as a base for receiving pressurization. A bolster 4 is placed on the bed 3. A top frame 5 is disposed above the bed 3 so as to face the bed 3 in parallel with a predetermined distance.
The bolster 4 and the top frame 5 are connected to each other by a linear guide 6 that doubles as a tie rod and a guide mechanism. A slide 7 is arranged between the bolster 4 and the top frame 5 so as to be reciprocally movable in the vertical direction by the guide of the linear guide 6.
The slide 7 is connected to an elevating cylinder 8 installed on the top frame 5, is lowered by an elongating operation of the elevating cylinder 8, and is raised by a contracting operation of the elevating cylinder 8.
A punching die 9 is mounted on the lower surface of the slide 7, and a punching receiving plate 10 that is paired with the punching die 9 is mounted on the upper surface of the bolster 4.
A rotating support shaft 4 a that rotatably supports the punching receiving plate 10 is provided on the upper surface of the bolster 4.

  In this punching device 1, the vertical movement of the punching die 9 with respect to the punching receiving plate 10 is performed by the vertical drive of the slide 7 by the operation of the elevating cylinder 8, and the punching receiver is matched to the relative operation. A predetermined punching process is performed on the material sheet that is intermittently fed onto the plate 10.

<Outline of punching die>
As shown in FIG. 2 (a), the punching die 9 has four corners from the material sheet intermittently fed in the sheet feeding direction, in which a required punching blade 9b is implanted on the die substrate 9a according to the product shape. A punching process is performed to obtain a square punched product having a rounded shape.

<Description of punching plate>
The punching receiving plate 10 serves to receive the punching blade 9b when the punching die 9 punches a material sheet.
The punching receiving plate 10 is provided with a resin plate 10a made of resin having a plate surface on the surface side against which the punching blade 9b is abutted. Here, the resin material is not particularly limited, but for example, Duracon (registered trademark) is suitable.
A base plate 10b is overlaid on the back surface of the resin plate 10a. This base plate 10b provides a resistance against pressurization to the resin plate 10a to support the resin plate 10a from the back side. Here, the base plate 10b is preferably made of metal, and for example, an aluminum plate or an iron plate is preferably used.
As shown in FIGS. 2B and 2C, a counterbore 11 is provided at a required position including the four corners of the resin plate 10a, and a cap bolt, a screw or the like that is screwed into the base plate 10b through the counterbore 11 is fastened. The resin plate 10a and the base plate 10b are fastened and fixed by the tool 12.

<Description of rotary bearing>
The base plate 10 b is provided with a rotary bearing portion 13 that engages with a rotary support shaft 4 a that protrudes from the bolster 4. Due to the engagement between the rotary support shaft 4 a and the rotary bearing portion 13, the punching receiving plate 10 can be rotated around the rotary support shaft 4 a on the upper surface of the bolster 4.
The rotary bearing portion 13 is formed by drilling a round hole into which the rotary support shaft 4a is fitted at an eccentric position deviated from the center position of the base plate 10b.

<Description of auxiliary plate>
By the way, when the punching blade 9b is repeatedly abutted against the plate surface on the surface side of the resin plate 10a, the surface portion is scratched, and as shown in FIG. Finally, there is a risk of losing sharpness. In order to prevent such a problem, the surface portion of the resin plate 10a with scratches may be ground as shown in FIG. 3B. As a matter of course, this surface grinding makes the thickness of the punching receiving plate 10 thinner than the original thickness C. When the surface grinding allowance is t, the thickness of the punching receiving plate 10 is (C−t), and the pressing force of the punching die 9 is adjusted by the output operation of the elevating cylinder 8 in accordance with the change in the plate thickness. There is a problem that it takes time and effort.
Therefore, as shown in FIG. 3 (c), a plate that compensates for the reduction in thickness (t: see FIG. 3 (b)) between the resin plate 10a and the base plate 10b due to the surface grinding of the resin plate 10a. By inserting the auxiliary plate 14 having a thickness t, the original plate thickness C is kept constant.
As shown in FIG. 2D, when the auxiliary plate 14 is sandwiched between the resin plate 10a and the base plate 10b, the three members are fastened and fixed by the fasteners 12 as well. A punching receiving plate 10 ′ having the same thickness and the same function as the punching receiving plate 10 is configured.

<Description of the effects of this embodiment>
According to the punching receiving plate 10 of the present embodiment, since the punching blade 9b is abutted against the plate surface on the surface side of the resin plate 10a during the punching process, there is a slight unevenness per edge of the punching blade 9b. However, it is possible to absorb the unevenness and bite the punching blade 9b, and to ensure a good sharpness.
Further, even if the surface grinding of the resin plate 10a is performed, the plate thickness of the punching receiving plate 10 can be kept constant. Therefore, if the plate thickness changes, the required pressing force of the punching die 9 is adjusted. Work can be omitted.
In addition, since the punching receiving plate 10 can be eccentrically rotated around the rotary bearing portion 13, the portion where the punching blade 9b is abutted can be changed so as not to overlap as much as possible, and a constant punching pressure can be obtained. Can be punched out, and a good sharpness can be secured over a longer period of time.

  The punching receiving plate of the present invention has been described based on one embodiment. However, the present invention is not limited to the configuration described in the above embodiment, and the configuration is appropriately set within the scope not departing from the gist thereof. Can be changed.

  The punching backing plate of the present invention has a characteristic that a good sharpness can be ensured even if there are some spots per blade of the punching blade, and is therefore suitable for use in manufacturing plastic bags. Can be used.

DESCRIPTION OF SYMBOLS 1 Punching device 4a Rotation support shaft 9 Punching die 9b Punching blade 10, 10 'Punching receiving plate 10a Resin plate 10b Base plate 12 Fastener 13 Rotating bearing part 14 Auxiliary plate

Claims (4)

A punching receiving plate that is used in a pair with a punching die in which a punching blade is implanted, and that receives the punching blade when punching into a material sheet by the punching die,
A resin plate made of resin having a plate surface on the surface side against which the punching blade is abutted;
A base plate that supports the resin plate from its back side;
A fastener for fastening the resin plate and the base plate;
A punching receiving plate characterized by comprising:   The punching support plate according to claim 1, wherein an auxiliary plate having a thickness that compensates for a reduction in thickness due to surface grinding of the resin plate is interposed between the resin plate and the base plate.   The punching support plate according to claim 1 or 2, wherein the base plate is provided with a rotary bearing portion that engages with a rotation support shaft that rotatably supports the punching support plate on a plane.   The punching support plate according to claim 3, wherein the rotary bearing portion is disposed at an eccentric position deviated from a center position of the base plate.

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