JP3189223B2 - Conveying method of sheet material in punching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a punching apparatus for punching a product portion such as a prepaid card or a credit card from a sheet material, and more particularly to a method of conveying a sheet material to a press mechanism.

[0002]

2. Description of the Related Art A magnetic recording card such as a prepaid card or a credit card is manufactured by punching a product portion from a flexible sheet material. In the sheet material, product parts are formed side by side. That is, the sheet material has a thickness of, for example, about 0.2 mm in which a magnetic material for information recording is applied to the back surface of a base made of plastic, and decoration and display are printed on both surfaces. The sheet material may be subjected to a perforation process. Since these printing and perforating processes are generally performed before the punching of the product part, the product part must be accurately punched from a predetermined position of the sheet material.

Here, an example of a conventional magnetic recording card punching method will be described with reference to FIG. Reference numeral 1 is a sheet material, and reference numeral 2 is a product part thereof. This product part 2
In the drawing, six rows are arranged in the transport direction A (right direction in the figure) of the sheet material 1 and three rows are arranged in a direction orthogonal thereto. However, in order to increase productivity, the number of rows in the transport direction A is generally The number of rows in the direction orthogonal to the transport direction A is at least 6 rows or more and is 3 to 8 rows.

[0006] Reference numeral 6 denotes a first sheet material transport mechanism. The first sheet material transport mechanism 6 is a gripper 7 for detachably holding one side of the sheet material 1 along the transport direction A.
The gripper 7a is supported by a ball screw 8 so as to be movable in a direction parallel to the transport direction A. Although only one first sheet material transport mechanism 6 is shown in the drawing, in actuality, another first sheet material transport mechanism having a gripper 7b for gripping the other side of the sheet material 1 is provided. A mechanism is provided. Ball screw 8
Are driven by a motor (not shown). Also, reference numeral 1
Reference numeral 1 denotes a second sheet material transport mechanism, and reference numeral 12 denotes a third sheet material transport mechanism. The second sheet material transport mechanism 11 and the third sheet material transport mechanism 13 include upper and lower members each covered with urethane or the like. The sheet material 1 is detachably sandwiched between upper and lower roller groups which are composed of a roller group and open and close vertically.
The sheet material 1 is transported in the direction of arrow A by the rotation of the roller. Further, the second sheet material transport mechanism 11
A press mechanism 13 for punching is provided between the third sheet material transport mechanism 12 and the third sheet material transport mechanism 12.

At the time of punching, the conveyed sheet material 1 is positioned by a positioning mechanism (not shown), and as shown in FIG. 7A, both side portions of the sheet material 1 are held by a pair of grippers 7a and 7b. Hold. This gripping is generally performed at the center of the side of the sheet material 1 or at a position near the transport direction A. Thereafter, as shown in FIG. 7B, the grippers 7a and 7b convey the sheet 1 forward, and the front portion of the sheet 1 enters between the upper and lower roller groups of the second sheet conveying mechanism 11. However, the product part 2 in the front row of the sheet material 1 has not reached the punching position of the press mechanism 13, that is, the hole of the die.

Thereafter, the sheet material 1 is conveyed forward by the pitch before and after the product portion 2 by the second sheet material conveying mechanism 11 or the third sheet material conveying mechanism 12. In the meantime, the product parts 2 in the front and rear rows are sequentially punched by the press mechanism 13. Although the sheet material 1 is initially conveyed only by the second sheet material conveying mechanism 11, FIG.
As shown in (c), when the sheet material 1 enters between the upper and lower roller groups of both the second sheet material transport mechanism 11 and the second sheet material transport mechanism 12, the two transport mechanisms 1
It is conveyed by 1 and 12. Further, as shown in FIG. 7D, after the sheet material 1 comes off between the upper and lower roller groups of the second sheet material transport mechanism 11, the sheet material 1
Is conveyed only by the sheet material conveying mechanism 12. At the time shown in FIG. 7B, when the sheet 1 is delivered to the second sheet material transport mechanism 11, the grippers 7a, 7b
Releases the grip of the sheet material 1, returns to the rear, and grips the next sheet (not shown).

[0007] Compared to the above-described transport by rollers,
The conveyance of the sheet material by the gripper fed by the ball screw can obtain high precision. In fact, when punching by a press mechanism, a method of transporting a sheet material by a gripper is also adopted, but productivity is not improved by transporting the sheet material only by the gripper. because,
This is because the gripper cannot receive the next sheet material until punching of one sheet material is completed.

[0008]

However, in the above-described conventional sheet material conveying method, the pair of first sheet material conveying mechanisms on both side portions of the sheet material advance synchronously, and the gripped sheet material is moved to the second sheet material. After being sandwiched between a pair of rollers of the sheet material transport mechanism, the sheet material is synchronously retracted to start the transport operation of the next sheet material. For this reason, the cycle time from when the sheet material is transported to the sheet material loading side of the second sheet material transport mechanism from the positioning position is long, and due to this, it is necessary to supply the sheet material to the press mechanism. The cycle time is also longer. In addition, since the time required to complete the punching of all the product portions of the sheet material by the press mechanism is as fast as about 3.2 seconds, the sheet material cannot be conveyed to the press mechanism with respect to the punching. ,
There is a problem that the productivity of the sheet material by the press mechanism is low.

It is also conceivable that a pair of first sheet material transport mechanisms are used alternately, and one of the first sheet material transport mechanisms grips and transports one end of the sheet material in a cantilever state. . In this case, the productivity of the punching of the sheet material is improved, but the following positional deviation of the sheet material may occur. That is, due to the undulation of the sheet material or the variation in the thickness of the sheet material itself, the sheet material rotates around the gripper when the sheet material is sandwiched between the rollers of the second sheet material transport mechanism, As a result, the punching accuracy of the product portion is lower at the rear end portion of the sheet material.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and provides a method of conveying a sheet material in a punching device, which improves the productivity of the punching of the sheet material in the punching device. It is an object. Further, a further object of the present invention is to provide a method of conveying a sheet material in a punching device, which can reliably prevent a displacement of the sheet material in a press mechanism due to undulation of the sheet material and improve the accuracy of punching. It is to provide.

[0011]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, the present invention is to sequentially punch a product portion formed at a predetermined position on a sheet material while conveying the sheet material in a certain direction.
A punching device that pulls out sheets on both sides in the width direction of the sheet material.
In addition , a pair of first sheet material transport mechanisms having a gripper for transporting the sheet material by grasping and moving the widthwise end of the sheet material, and rotating the sheet material by sandwiching the sheet material, the sheet material is rotated. provided between the second sheet material conveying mechanism and the third sheet material conveying mechanism having a roller group for transporting respectively, these second sheet material conveying mechanism and the third sheet material conveying mechanism, from the sheet material A press mechanism for punching a product part and a second sheet material transport mechanism.
Both ends in the width direction of the sheet material at the front
Using <br/> punching device provided with a separate clamping possible pair of clamping members in the direction, using the pair of the first sheet conveying mechanism alternately, one gripper has been prepositioned front Gripping the sheet material and moving it forward
While retracted release the sheet material after sandwiched second sheet conveying mechanism conveys the more the sheet material, other
Before all the product portions of the preceding sheet material are punched out by the press mechanism , the gripper grips the next succeeding sheet material that has been positioned in advance and moves the gripper to the preceding stage of the second sheet material transport mechanism . While transporting and waiting,
The sheet material is a roller of the second sheet material transport mechanism
Between the time immediately before and immediately after being sandwiched,
The gripper side clamp member that is not gripping the material
To temporarily hold the end of the sheet material in the width direction.
Method of conveying sheet material in punching device characterized by the following:
Propose a law.

In the above-described transport method, the clamp member
Pull the edge of the sheet material outward in the width direction.
It may be.

The operation of the present invention will be described below. According to the first aspect of the present invention, while the preceding sheet material is transferred to the second sheet material transport mechanism by one first sheet material transport mechanism, the subsequent first sheet material transport mechanism is moved to the subsequent sheet material by the other first sheet material transport mechanism. The sheet material can be held, and the sheet material at the subsequent stage can be made to stand by before the punching of the sheet material at the preceding stage is completed. In this case, one of the first sheet material transport mechanisms
The sheet material conveyed by the gripper is a second sheet material
Immediately before and immediately after being caught by the rollers of the transport mechanism
To the clamp member on the other first sheet material transport mechanism side.
The end of the sheet material is temporarily held. This allows
In the unlikely event of sheet material undulation, etc.
Sheet material is sandwiched between rollers of the second sheet material transport mechanism
Sheet rotates around the gripper
The rotation is prevented by opposing the force of
Prevent misplacement.

According to the second aspect of the present invention, the end of the sheet material is pulled laterally outward by the clamp member, so that the sheet material is subjected to the second tension under a slight tension in the width direction. The sheet is sandwiched by the sheet material transport mechanism, and the prevention of the displacement is ensured.

[0015]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a view showing each step of an embodiment of a sheet material conveying method according to the present invention, and FIG. 2 is a plan view (top view) of a punching apparatus used when carrying out the sheet material conveying method according to the present invention. FIG. 3 is a side view of the press mechanism of FIG. 2, and FIG. 4 is a cross-sectional view taken along line XX in FIG.

As shown in FIGS. 1 and 2, reference numeral 21 denotes a sheet material having flexibility.
As shown in the figure, the product has a plurality of product portions 22 formed at predetermined positions. These product portions 22 are arranged in six rows in the transport direction A (right direction in the figure) of the sheet material 21 and in three rows in a direction orthogonal thereto, but are not limited thereto. In FIG. 2, the sheet material 21 indicated by a dashed line and the sheet material 21 indicated by a two-dot chain line indicate a preceding sheet material and a succeeding sheet material, respectively.

Here, the configuration of the punching device used in this embodiment will be described. In the following description, the transport direction A is assumed to be forward. As shown in FIG. 2, reference numeral 26 denotes a belt conveyor, reference numeral 27 denotes a pair of first sheet material transport mechanisms on the left and right sides of the belt conveyor 26, and reference numeral 28 denotes a position in front of the first sheet material transport mechanisms 27. Reference numeral 29 denotes a second sheet material transporting mechanism, and reference numeral 29 denotes a third sheet material transporting mechanism in front of the second sheet material transporting mechanism 28.
Reference numeral 0 denotes a press mechanism provided between the second sheet material transport mechanism 28 and the third sheet material transport mechanism 29.

The belt conveyor 26 provided on the table 31 carries the sheet material 21 before punching and conveys it forward. On the table 31, around the front of the belt conveyor 26, there is a sheet. A positioning mechanism for positioning the member 21 is provided. This positioning mechanism includes a first gauge pin 32 located near the front of the belt conveyor 26 and a belt conveyor 2.
A pair of front and rear second gauge pins 33 located to the right of 6
And a pair of leaf springs 34 located on the left side of the belt conveyor 26 and opposed to the two second gauge pins 33, respectively. The first gauge pin 32 is driven up and down by an air cylinder 35. The two second gauge pins 33 are simultaneously driven left and right by the air cylinder 36. The two leaf springs 34 include an air cylinder 37.
Are simultaneously driven left and right.

Next, the structure of the first sheet conveying mechanism 27 will be described. On both left and right sides of the table 31, ball screws 41 are axially supported with the longitudinal direction as the axial direction. These two ball screws 41 are independently rotated by a servo motor 43 via a power transmission mechanism 42 including a belt and a pulley.
Each of the ball screws 41 has a gripper 4
4a and 44b are supported. These grippers 44
Reference numerals a and 44b independently move back and forth with the rotation of each ball screw 41. And each gripper 4
Reference numerals 4a and 44b open and close vertically by air drive, and detachably hold the right or left side of the sheet material 21. A rotary encoder 45 is connected to the rear end of each ball screw 41. Thus, the positions of the grippers 44a and 44b can be accurately controlled.

The features of this embodiment are shown in FIGS.
As shown in the figure, when the gripper 44a (44b) is in the forward position, the gripper 44a (44b)
The clamp mechanism 70a
(70b) is provided. That is, a pair of clamp mechanisms 70a and 70b are provided so as to oppose each other in the width direction of the sheet material 21.
Since the configuration of the pair of clamp mechanisms 70a and 70b is the same, only one clamp mechanism 70a will be described. A fixed clamp member 73 is attached to the tip (upper end) of the shaft member 74.
Is fixed. On the other hand, a movable clamp member 71 is provided at the tip (lower end) of a shaft member 72 provided thereabove. The upper shaft member 72 is configured to be moved in the vertical direction (the direction of the arrow Z) by a drive mechanism (not shown), whereby the sheet material 21 can be held between the movable clamp member 71 and the fixed clamp member 73. The sheet material 21 is clamped by the movable clamp member 71 and the fixed clamp member 73 at a portion outside the product portion 22.
The lower shaft member 74 is fixed to, for example, a frame (not shown) of the punching device, and the upper shaft member 72 is moved by the driving mechanism provided on the frame.

The pair of clamp mechanisms 70a, 70b
Are not driven at the same time, that is, when the sheet material 21 is conveyed by the gripper 44a of one first sheet material conveying mechanism 27, the first sheet material conveying mechanism 27 that is not used is This uses the clamp mechanism 70b on the gripper 44b side (see the dashed line in FIG. 4). The driving timing of the one clamp mechanism 70 is set between immediately before and immediately after the sheet material 21 is sandwiched between the rollers 51 and 53 of the second sheet material transport mechanism 28.
b, the movable clamp member 71 is moved down to
1 is temporarily held in the width direction. The surfaces of the movable clamp member 71 and the fixed clamp member 73
The sheet material 21 is covered with a suitable elastic material such as urethane rubber, so that the sheet material 21 is not damaged. The lower fixed clamp member 73 may be configured to be able to move up and down similarly to the movable clamp member 71.

Next, the configurations of the second sheet material transport mechanism 28 and the third sheet material transport mechanism 29 will be described. The two transfer mechanisms 28 and 29 are provided on a base 50 of the press mechanism 30 and have feed rollers 51 and 52 having axial directions in the left-right direction, respectively, and these feed rollers 51 and 52.
And pressing rollers 53 and 54 having an axial direction in the left-right direction, which is located above. Feed rollers 51, 52
Are fixed in position, and are commonly rotated and driven by one servomotor 56 via a power transmission device 55 composed of a belt and a pulley. Both feed rollers 51 and 52 rotate simultaneously at the same speed. Also,
The press rollers 53 and 54 are driven in the vertical direction by air cylinders 57 and 58, respectively, and rotate following the feed rollers 51 and 52. The surfaces of the rollers 51, 52, 53, and 54 are all covered with a suitable elastic material such as urethane rubber.

Next, the configuration of the press mechanism 30 will be described. As shown in FIG. 3, the press mechanism 30 has a lower mold 61 attached to an upper surface of the base 50, and an upper mold 63 attached to a lower surface of an upper ram 62 located above the base 50. ing. Then, as the upper ram 62 is driven up and down, the lower mold 61 and the upper mold 63 open and close. The lower mold 61 is located between the feed roller 51 of the second sheet material transport mechanism 28 and the feed roller 52 of the third sheet material transport mechanism 29, and their upper surfaces are the same. Located at height. Although not shown, the press mechanism 30 is a push-back type, and a product separation mechanism 66 for separating the product portion 22 punched from the sheet material 21 is provided in front of the third sheet material transport mechanism 29. Is provided.

Next, the punching method will be described. As shown in FIG. 1, the sheet material 21 is first conveyed forward by the belt conveyor 26, stops at the first gauge pin 32 that has risen, and stops. Here, as shown by a chain line in FIG. 2, the second gauge pin 33 advances to the left, and the leaf spring 34 advances to the right to
1 is pressed against the second gauge pin 33. Thus, the sheet material 21 is positioned by the gauge pins 32 and 33 with reference to the two sides orthogonal to each other. After this positioning, the gripper 44a of one of the first sheet conveying mechanisms 27 grips the side of the sheet 21a. Then
The first gauge pin 32 descends, and the second gauge pin 33
After the leaf spring 34 is retracted, one of the grippers 44
a moves forward, and the sheet material 21 is conveyed forward.

As shown in FIG. 1A, when the sheet material 21 is conveyed by the first sheet material conveying mechanism 27, the product parts 22 in the front row of the sheet material 21 are pressed.
It is fed to a punching position of 0, that is, a position on the hole of the die of the lower mold 61. Here, the press roller 53 of the second sheet material transport mechanism 28 descends, and this press roller 5
The sheet material 21 is sandwiched and held between the feed roller 3 and the feed roller 51. Thereafter, the gripper 44a releases the holding of the sheet material 21 and returns to the rear. Between immediately before and immediately after the sheet material 21 is sandwiched by the pressing roller 53 and the feed roller 51, the clamp mechanism 70b on the other first sheet material transport mechanism 27 side is driven to move and fix the movable and fixed clamp members 71 and 73. Holds the other end of the sheet material 21. Accordingly, when the sheet material 21 is sandwiched between the rollers 51 and 53 of the second sheet material transport mechanism 28, the sheet material 21 opposes the force of rotating about the gripper 44a and prevents the rotation. The displacement of the sheet material 21 can be prevented. Meanwhile, the other first
The gripper 44b of the sheet material transport mechanism 27 of the first embodiment grips the side portion of the previously positioned sheet material 21 and moves forward, so that before the sheet material 21 of the preceding stage finishes punching described later, The sheet material 21 is made to stand by on the sheet material carry-in side of the second sheet material transport mechanism 28. As described above, the conveyance of the sheet material 21 at the subsequent stage is performed by the other gripper 44b, and the sheet material 2
The other clamping mechanism 70a is used this time in order to prevent the displacement of the first clamp mechanism 70a.

In the press mechanism 30, the upper mold 6
As 3 descends, the product portion 22 in the front row of the sheet material 21 is punched. The press mechanism 30 is a push-back type, and the product portion 22 punched from the sheet material 21 is returned to the sheet material 21 once, and then is conveyed together with the sheet material 21 and unloaded from the press mechanism 30. .

After the product portion 22 in the front row of the sheet material 21 is punched out and the upper mold 63 is raised, the feed roller 51 and the press roller 5 of the second sheet material transport mechanism 28 are moved.
3 rotates, whereby the sheet material 21 is transported forward by one pitch, and as shown in FIG.
Is sent to the punching position of the press mechanism 30. Accordingly, the front part of the sheet material 21 is connected to the feed roller 5 of the third sheet material transport mechanism 29.
2 and the press roller 54, and thereafter, the press roller 54 descends, and the sheet material 21 is sandwiched and held between the feed roller 52 and the press roller 54. Then, as the upper mold 63 descends, the product portion of the next row of the sheet material 21 is punched.

After the product part 22 in the next row of the sheet material 21 is punched out and the upper mold 62 is raised, the feed roller 52 and the press roller 54 of the third sheet material transport mechanism 29 are moved.
Rotates, whereby the sheet material 21 is conveyed one pitch forward, and as shown in FIG.
Is sent to the press mechanism 30. Such an operation is repeated, and the sheet material 2
The punching of all the product parts 22 is completed.

Thereafter, the sheet material 21 is further transported forward, and the product part 22 is separated from the sheet material 21 and collected by the product separation mechanism 66. Product part 2
The remaining material of the sheet material 21 from which 2 has been separated is separately collected.
After the sheet material 21 comes out of the third sheet material transport mechanism 29, the press roller 54 moves up.

As described above, the sheet material 21 is sequentially sent to the press mechanism 30 and punched out. The pair of first sheet material transport mechanisms 27 alternately transport the sheet material 21 to the press mechanism 30. I do. This is to shorten the cycle of transporting the sheet material 21.
The sheet material 21 is cantilevered by a and 44b. However, both sides of the sheet material 21 are gripped by the grippers 44a, 44b.
Cantilevered sheet material 2 than double-sided holding
1 does not change, and the positional accuracy increases.

A pair of first sheet conveying mechanisms 27
Are alternately used to form one of the first sheet material transport mechanisms 27.
While the previous sheet material 21 conveyed toward the press mechanism 30 by the gripper 44a is punched out by the press mechanism 30, the gripper 44b of the other first sheet material conveyance mechanism 27 grips the subsequent sheet material 21. The press mechanism 30 can be put on standby. As a result, the sheet material conveyance cycle time can be shortened, high-speed punching can be supported, and the productivity of sheet material punching can be improved. The product portion 22 in the front row of the sheet material 21 is fed to the punching position of the press mechanism 30 by one gripper 44a of the first sheet material transport mechanism 27. After being sandwiched by the mechanism 28, the gripper 44a separates from the sheet material 21 and is next to the sheet material 21 at the subsequent stage (not shown).
Used to transport In this way, the pair of first sheet conveying mechanisms 27 are used alternately.

FIG. 5 is a view showing another embodiment of the clamp mechanism. In this example, the movable clamp member 81 of the clamp mechanism 80a is forcibly rotated outward in the width direction of the sheet material 21 (see arrow θ). ), And the other configuration is the same as that of FIG. Accordingly, the end of the sheet material 21 is pulled laterally outward by the clamp member 81 which is forcibly rotated, so that the sheet material 21 receives a slight tension in the width direction and the second sheet material transport mechanism 28 , And the prevention of the displacement is ensured.

FIG. 6 is a view showing still another embodiment of the clamp mechanism. In this embodiment, the upper surface of the fixed clamp member 93 of the clamp mechanism 90a is gently inclined outward from the end of the sheet material. Correspondingly, the lower surface of the movable clamp member 91 is also inclined, and the other configuration is the same as that of FIG. Also in the present embodiment, the end of the sheet material 21 is pulled laterally outward by the movable clamp member 91, so that the sheet material 21 is conveyed to the second sheet material under a slight tension in the width direction. It is sandwiched by the mechanism 28, and the prevention of the displacement is ensured.

[0034]

According to the present invention, since consists as described above, the following effects. The invention according to claim 1, using alternately a pair of the first sheet material conveying mechanism, one of the first by the sheet material conveying mechanism of the previous stage which is conveyed toward the press mechanism sheet material of the press mechanism Hit by
Before the end of the punching step , the other first sheet material transport mechanism can grip the subsequent sheet material and make it stand by with respect to the press mechanism . As a result, the punching device punches the sheet material. Can increase the productivity of
it can. Further, the displacement of the sheet material when the sheet material is transferred to the second sheet material transport mechanism can be prevented, and the punching position accuracy in the press mechanism can be suppressed within a range of ± 0.1 mm. The invention according to claim 2, in addition to the above effects, it is FIG Rukoto to further improve the positional accuracy
You .

[Brief description of the drawings]

FIG. 1 is a diagram for explaining each step of an embodiment of a sheet conveying method according to the present invention.

FIG. 2 is a plan view (top view) of a punching device used when performing an embodiment of the sheet conveying method of the present invention.

FIG. 3 is a side view of the press mechanism of FIG. 2;

FIG. 4 is a sectional view taken along line XX in FIG. 2;

FIG. 5 is a view corresponding to FIG. 4, showing another embodiment of the clamp mechanism according to the present invention.

FIG. 6 is a view corresponding to FIG. 4 and showing still another embodiment of the clamp mechanism according to the present invention.

FIG. 7 is a plan view (top view) for explaining each step of a conventional sheet material conveying method.

[Explanation of symbols]

Reference Signs List 21 sheet material 22 product part 26 belt conveyor 27 first sheet material transport mechanism 28 second sheet material transport mechanism 29 third sheet material transport mechanism 30 press mechanism 31 table 32 first gauge pin 33 second gauge pin 34 plate Spring 35, 36, 37 Air cylinder 41 Ball screw 42 Power transmission device 43 Servo motor 44a, 44b Gripper 45 Rotary encoder 50 Base 51, 52 Feed roller 53, 54 Holding roller 55 Power transmission device 56 Servo motor 57, 58 Air cylinder 61 Lower mold 62 Upper ram 63 Upper mold 66 Product separation mechanism 70a, 70b, 80a, 80b Clamp mechanism 71, 81, 91 Movable clamp member 72, 82, 92 Shaft member 73, 83, 93 Fixed clamp member 74, 84, 4 shaft member

Claims (2)

(57) [Claims] 1. While conveying a sheet material in a certain direction,
The product portion formed at a predetermined position of the sheet material is sequentially struck.
A punching device Nuku Chi, each provided al is on both sides of the width direction of the sheet material, grasps the end portion in the width direction of the sheet material
A pair of first sheet conveying mechanism having a gripper for conveying the sheet material by moving the sheet material
A second sheet material transport mechanism having a roller group for transporting the sheet material by being pinched and rotated;
Sheet material transport mechanism and the second sheet material transport mechanism
When provided between the third sheet conveying mechanism, a press mechanism for punching the product portion from the sheet material, the second Sea
At both ends in the width direction of the sheet material at the previous stage of the
A pair of clamps that can separately clamp in the thickness direction
Using punching device that includes a member, using the pair of the first sheet conveying mechanism alternately one
The gripper is the pre-positioned sheet material of the previous stage
Sheet material after sandwiched second sheet conveying mechanism conveys the more sheet material to be gripped to advance the
While retracted release the, other gripper, the all products part of the front of the sheet material said press mechanism
Before the punching is completed, the next succeeding sheet material that has been positioned in advance is gripped and the preceding sheet material of the second sheet material conveying mechanism is gripped.
And the sheet material is brought into a standby state, and the sheet material is a roller of the second sheet material transport mechanism.
Between the time immediately before and immediately after being sandwiched,
The gripper side clamp member that is not gripping the material
To temporarily hold the end of the sheet material in the width direction.
And a sheet material conveying method in a punching device. 2. An end portion of the sheet material is pulled outward in the width direction by the clamp member.
A method for conveying a sheet material in the punching device according to claim 1 .