FPC adhesive material improvement cutting process design device

Abstract

The present application relates to the technical field of die cutting processing of flexible circuit board glue, and particularly relates to an FPC glue material dropping improvement cutting process design device, which comprises a punch die cutting part, which comprises an upper backing plate, an upper clamping plate and an upper punch plate placed in sequence from top to bottom, guide columns are arranged at four corners of the upper backing plate, the guide columns pass through the inside of the upper clamping plate and the upper punch plate through through holes, two material belt clamping strips for positioning the material belt are symmetrically arranged at the bottom end of the upper punch plate, and a punch piece for opening holes is arranged at the center of the bottom end of the upper punch plate; and a material die part, which comprises a lower die plate for receiving FPC glue. The punching direction is changed to downward full penetration, the material seat and the material blowing piece are matched to form an automatic material dropping channel, the hole waste material is directly dropped into the material seat after punching and is blown out by airflow in a designated direction, manual machine stop for cleaning the waste material in the die is not needed, the production efficiency is effectively improved, and the workshop environment is improved.

Description

Technical Field

[0001] This invention relates to the field of die-cutting technology for flexible circuit board adhesives, and more particularly to a device for improving the cutting process of FPC adhesive blanking. Background Technology

[0002] In the manufacturing process of backlight modules, the cutting process of flexible printed circuit board (FPC) adhesive is one of the key steps affecting product quality and production efficiency. FPC adhesive is typically die-cut in whole sheets to form a precision structure corresponding to the lamp hole positions, for subsequent assembly with FPC panels. As the market's requirements for the optical effects, assembly precision, and reliability of backlight products continue to increase, the stability, precision, and waste disposal methods of the FPC adhesive cutting process have become key areas of focus in the industry.

[0003] Currently, the most common FPC (Flexible Printed Circuit) cutting process in the industry is the upward suction die-cutting method. In this method, waste material is discharged upwards through a suction mechanism during the cutting process. However, due to limitations in the mold structure and cutting direction, waste material easily remains or adheres inside the mold, preventing it from smoothly detaching from the lamp hole area after cutting. In practice, operators need to frequently stop the machine to manually clean the residual waste material inside the mold, which not only consumes a lot of time but also easily causes residual adhesive to splatter during the cleaning process, affecting the cleanliness and management level of the workshop.

[0004] Furthermore, due to poor waste removal, waste accumulation and mold jamming are prone to occur during the punching process, further leading to a decrease in punching accuracy. Key dimensions such as lamp hole size, the total length, width, and angle of the entire FPC adhesive sheet are difficult to consistently control within the required process range. Especially in mass production, frequent mold changes and manual intervention in jump distance parameters make it difficult to guarantee dimensional consistency, thus affecting the alignment accuracy of the FPC adhesive with the FPC panel, causing abnormal optical effects and customer quality complaints.

[0005] Existing cutting methods also have significant efficiency bottlenecks. Frequent manual waste removal limits cutting speed, making it difficult to meet the demands of large-scale production. Furthermore, short mold life and inconsistent precision across batches further increase production costs and quality control difficulties. Therefore, a new FPC (Flexible Printed Circuit) blanking and cutting process design device is needed to address these issues. Summary of the Invention

[0006] The purpose of this invention is to solve the problems mentioned in the background section.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A device for improving the cutting process of FPC adhesive blanking includes: The die-cutting part includes an upper pad, an upper clamping plate, and an upper punching plate installed sequentially from top to bottom. The upper pad has guide posts at its four corners, and the guide posts pass through the interior of the upper clamping plate and the upper punching plate through through holes. Two strip clamps for positioning the strip are symmetrically installed at the bottom end of the upper punching plate, and a punch for making holes is provided at the center of the bottom end of the upper punching plate. The mold part includes a lower mold plate for receiving FPC adhesive. The surface of the lower mold plate is provided with a material discharge groove adapted to the punch. A lower pad plate is provided below the lower mold plate, and a material discharge bin is provided at the center of the lower pad plate at a position adapted to the material discharge groove of the lower mold plate. The material guiding part includes a material seat located below the lower pad for holding waste material. The bottom end of the material seat is connected to a base. A drop trough is provided at the center of the material seat, and a material blowing component for blowing material is provided on one side of the inner wall of the drop trough.

[0008] Preferably, the material holder has an inclined discharge port on the left side of the trough, and the blowing component includes a guide plate. The left side of the guide plate is set with a triangular tip, and the upper inclined surface of the guide plate is used to guide the falling material.

[0009] Preferably, the lower inclined surface of the guide plate is provided with a plurality of flow collecting shrouds, the flow collecting shrouds are designed as hollow frustums, and the internal holes of the flow collecting shrouds gradually increase from left to right.

[0010] Preferably, a plurality of diversion pipes are provided at the corresponding position of the right side hole of the flow collecting hood, and the end of the diversion pipe is connected to the blowing pipe, and the end of the blowing pipe is threaded with an adapter, and the end of the adapter is provided with an air source device through a pipe.

[0011] Preferably, the bottom of the inner wall of the material base is provided with a plurality of material-pushing components, and the top of the material-pushing components extends into the interior of the material-feeding bin, and the position of the material-pushing components is adapted to the position of a plurality of the flow collection hoods.

[0012] Preferably, the material feeding component includes a fixed plate fixed to the inner wall of the material seat, and a swing spring is connected to the top of the fixed plate, an upper receiving plate is connected to the top of the swing spring, and a cutting edge is connected to the top of the upper receiving plate.

[0013] Preferably, the two sides of the blade are provided with inclined blade surfaces, and the inclined surfaces of the blade are adapted to correspond to the flow collector.

[0014] Preferably, the surface of the swing spring is covered with a rubber sleeve, and the upper and lower ends of the rubber sleeve are respectively connected and fixed to the upper receiving plate and the fixed plate.

[0015] Preferably, the punching component punches downward into the material discharge groove of the lower template during punching and extends into the interior of the material discharge bin.

[0016] This invention has at least the following beneficial effects: 1. This invention changes the punching direction to downward full penetration, and forms an automatic material dropping channel with the material holder and the blowing component, so that the waste material of the lamp hole falls directly into the material holder after punching and is blown out by airflow in a directional manner, without the need for manual shutdown to clean the waste material in the mold, effectively improving production efficiency and improving the workshop environment.

[0017] 2. This invention converts the mechanical kinetic energy during punching into a pushing action by setting a material-pushing component with a swing spring, which helps to push off any potentially sticky waste material. Combined with the inclined guide plate and the accelerated air blowing of the flow collector, it ensures that the waste material is completely discharged, avoiding dimensional deviations and customer complaints caused by residue.

[0018] 3. By optimizing the mold structure and jump compensation design, this invention enables a single mold to meet the full-cycle production of the same model, avoiding dimensional fluctuations caused by frequent mold changes and manual adjustments. This effectively ensures the consistency of key dimensions such as the angle, total length, and total width of the entire FPC adhesive, reducing production costs and quality risks. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the following description of the embodiments will be briefly introduced. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the external structure of a cutting process design device for improving FPC adhesive blanking proposed in this invention; Figure 2 This is a three-dimensional disassembly diagram of the punch die-cutting part in the FPC adhesive blanking improvement cutting process design device proposed in this invention; Figure 3 This is a partial bottom view of the die-cutting part in the FPC adhesive blanking improvement and cutting process design device proposed in this invention; Figure 4 This is a three-dimensional disassembly diagram of the material mold part in the FPC adhesive blanking and cutting process improvement device proposed in this invention; Figure 5 This is a partial bottom view of the die section in a device for improving the cutting process of FPC adhesive blanking proposed in this invention. Figure 6This is a schematic diagram of the connection structure between the material mold part and the material guiding part in an FPC adhesive blanking and cutting process improvement device proposed in this invention; Figure 7 This is a three-dimensional structural diagram of the material guiding part in an FPC adhesive feeding and cutting process improvement device proposed in this invention; Figure 8 This is a three-dimensional structural diagram of the blowing component in an FPC adhesive blanking and cutting process improvement device proposed in this invention; Figure 9 This is a schematic diagram of the internal disassembly structure of the material feeding component in an FPC adhesive blanking and cutting process improvement device proposed in this invention.

[0021] In the picture: 1. Die-cutting part; 11. Upper backing plate; 12. Guide post; 13. Upper clamping plate; 14. Upper punch plate; 15. Material strip clamp; 16. Die-cutting part; 2. Material mold area; 21. Lower mold plate; 22. Lower backing plate; 23. Material drop hopper; 3. Material guiding part; 31. Material seat; 32. Base; 33. Blowing component; 331. Blowing pipe; 332. Adapter; 333. Diverter pipe; 334. Guide plate; 335. Flow collector; 34. Material pushing component; 341. Fixing plate; 342. Swinging spring; 343. Upper receiving plate; 344. Pushing blade; 345. Rubber sleeve. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0023] The structural composition of each part of this equipment is as follows: Reference Figure 1-9 A device for improving the cutting process of FPC adhesive blanking includes: The punch die-cutting part 1 includes an upper pad plate 11, an upper clamping plate 13 and an upper punch plate 14 installed sequentially from top to bottom. The upper pad plate 11 is provided with guide posts 12 at the four corners, and the guide posts 12 pass through the interior of the upper clamping plate 13 and the upper punch plate 14 through through holes. Two strip clamping strips 15 for positioning the strip are symmetrically installed at the bottom end of the upper punch plate 14. A punch part 16 for opening holes is provided at the center of the bottom end of the upper punch plate 14. The mold part 2 includes a lower mold plate 21 for receiving FPC adhesive. The surface of the lower mold plate 21 is provided with a material discharge groove that is compatible with the punch 16. A lower pad plate 22 is provided below the lower mold plate 21, and a material discharge bin 23 is provided at the center of the lower pad plate 22 at the position that is compatible with the material discharge groove of the lower mold plate 21. The material guiding part 3 includes a material seat 31 set below the lower pad 22 for holding waste material. The bottom end of the material seat 31 is connected to a base 32. A drop groove is opened at the center of the material seat 31, and a blowing element 33 for blowing material is provided on one side of the inner wall of the drop groove.

[0024] An inclined discharge port is provided on the left side of the material seat 31. The blowing component 33 includes a guide plate 334. The left side of the guide plate 334 is set with a triangular tip. The inclined surface of the guide plate 334 is used to guide the falling material.

[0025] The guide plate 334 has several flow collectors 335 on its inclined surface. The flow collectors 335 are hollow frustums with the number of holes inside gradually increasing from left to right.

[0026] Several diversion pipes 333 are provided at the corresponding position of the hole on the right side of the flow collector 335, and the end of the diversion pipe 333 is connected to the blowing pipe 331. The end of the blowing pipe 331 is threaded with an adapter 332, and the end of the adapter 332 is provided with an air source device through a pipe.

[0027] The bottom of the inner wall of the material base 31 is provided with several material feeding components 34, and the top of the material feeding components 34 extends into the material feeding bin 23, and the position of the material feeding components 34 is adapted to the position of several flow collection hoods 335.

[0028] The material feeding component 34 includes a fixed plate 341 fixed to the inner wall of the material base 31, and a swing spring 342 is connected to the top of the fixed plate 341. The top of the swing spring 342 is connected to an upper receiving plate 343, and the top of the upper receiving plate 343 is connected to a cutting blade 344.

[0029] The blade 344 is inclined, and inclined blade surfaces are provided on both sides of the blade 344. The inclined surfaces of the blade 344 are adapted to correspond to the flow collector 335.

[0030] A rubber sleeve 345 is fitted on the surface of the swing spring 342, and the upper and lower ends of the rubber sleeve 345 are respectively connected and fixed to the upper receiving plate 343 and the fixed plate 341.

[0031] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0032] Example 1: like Figures 1 to 7 As shown, this embodiment provides a device for improving the cutting process of FPC adhesive blanking, which mainly includes a punch die-cutting part 1, a material mold part 2, and a material guiding part 3.

[0033] The punching die-cutting part 1 serves as the upper die part, including an upper pad plate 11, an upper clamping plate 13, and an upper punching plate 14 installed sequentially from top to bottom. Guide posts 12 are provided at the four corners of the upper pad plate 11, and the guide posts 12 pass through the interior of the upper clamping plate 13 and the upper punching plate 14 through through holes to ensure accurate guidance and positioning when the upper and lower dies are closed. Two strip clips 15 for positioning the strip are symmetrically installed at the bottom of the upper punching plate 14 to press down the FPC strip before punching to prevent material deviation. A punching part 16 for opening holes is provided at the center of the bottom of the upper punching plate 14.

[0034] The material mold part 2 serves as the lower mold part, including a lower mold plate 21 for receiving FPC adhesive. The surface of the lower mold plate 21 is provided with a material discharge groove that is adapted to the punch 16. A lower pad 22 is provided below the lower mold plate 21, and a material discharge chamber 23 is provided at the center of the lower pad 22 at a position that is adapted to the material discharge groove of the lower mold plate 21. During punching, the punch 16 punches downward into the material discharge groove and into the material discharge chamber 23, completely punching and separating the waste material of the lamp hole on the FPC adhesive, and allowing the waste material to fall naturally into the guide part 3 below by gravity. This downward full-penetration punching method fundamentally avoids the waste material from sticking inside the mold.

[0035] The material guiding part 3 includes a material seat 31 located below the lower pad plate 22 for receiving waste material. The bottom end of the material seat 31 is connected to a base 32 for overall support. A drop trough is provided at the center of the material seat 31 to receive waste material falling from the drop hopper 23. A blowing element 33 for blowing material is provided on one side of the inner wall of the drop trough.

[0036] In this embodiment, a complete channel from punching separation to gravity discharge is constructed by the vertical through-design of the punching die part 1, the die part 2 and the guide part 3. The waste material after punching does not require manual intervention and falls directly into the material seat 31, which effectively solves the problem of waste residue and the need to stop the machine for cleaning in the traditional process, provides a foundation for subsequent automated blowing, and significantly improves production efficiency.

[0037] Example 2: This embodiment optimizes the blowing structure of the material guiding part 3 based on Embodiment 1, such as... Figure 7 and Figure 8 As shown, the material base 31 has an inclined discharge port on the left side of the trough, which facilitates the directional discharge of waste materials.

[0038] The blowing component 33 includes a guide plate 334. The left side of the guide plate 334 is set with a triangular tip, which is designed to reduce airflow resistance and form a guide. The upper inclined surface of the guide plate 334 is used to guide the falling material, so that the waste material falling from the material hopper 23 can slide down the inclined surface to prevent accumulation. The lower inclined surface of the guide plate 334 is provided with several flow collecting hoods 335. The flow collecting hoods 335 are designed as hollow frustums, and the internal holes gradually increase from left to right, forming a funnel shape with the left side smaller and the right side larger. This structure conforms to the Venturi effect principle of fluid mechanics, which can converge and accelerate the airflow.

[0039] Furthermore, a number of diversion pipes 333 are provided at the corresponding positions of the right-side holes of the flow collector 335, and the ends of the diversion pipes 333 are connected to the blowing pipes 331. The end of the blowing pipes 331 is threadedly connected to an adapter 332, and the end of the adapter 332 is provided with an air source device through a pipe.

[0040] During operation, the high-pressure gas provided by the gas source equipment passes through the adapter 332 and the blowing pipe 331 in sequence into the diversion pipe 333. Then, it is accelerated by the frustum-shaped structure of the collecting hood 335 and ejected. As the upper inclined surface of the guide plate 334 guides the waste material to fall, the high-speed airflow ejected from the lower inclined surface forms a directional airflow field in the drop trough, which quickly and efficiently blows the waste material to the inclined discharge port on the left, realizing the automatic collection and discharge of waste material. This structure not only replaces manual cleaning, but also has high blowing efficiency and controllable direction, effectively avoiding secondary accumulation of waste material in the material seat 31 and ensuring the stability of continuous production.

[0041] Example 3: This embodiment, based on embodiment two, further adds a mechanical material feeding structure to assist in material feeding, in order to deal with waste materials that may be stuck due to static electricity or adhesion, such as... Figure 6 and Figure 9 As shown, the bottom of the inner wall of the material base 31 is provided with several material pushing parts 34. The top of the material pushing parts 34 extends into the interior of the material dropping bin 23, and the position of the material pushing parts 34 is adapted to the position of several flow collecting hoods 335 to form a synergistic effect of air blowing and mechanical pushing.

[0042] Specifically, the material feeding component 34 includes a fixed plate 341 fixed to the inner wall of the material base 31. A swing spring 342 is connected to the top of the fixed plate 341. An upper receiving plate 343 is connected to the top of the swing spring 342. A cutting edge 344 is connected to the top of the upper receiving plate 343. The cutting edge 344 is inclined and has inclined blade surfaces on both sides. The inclined surfaces of the cutting edge 344 are adapted to and correspond to the flow collector 335. A rubber sleeve 345 is fitted on the surface of the swing spring 342. The upper and lower ends of the rubber sleeve 345 are respectively connected and fixed to the upper receiving plate 343 and the fixed plate 341. The rubber sleeve 345 protects the spring and provides damping, making the swing more stable.

[0043] When the punch 16 punches downward and penetrates into the discharge bin 23, its impact force or the impact force of the falling waste material is transmitted to the swivel bar 344, causing the swing spring 342 to swing elastically, driving the swivel bar 344 to make reciprocating swivel motions in the discharge bin 23 and the material seat 31. At the same time, the airflow ejected from the flow collector 335 also acts on the inclined surface of the swivel bar 344, assisting its swing. The inclined blade surface on the swivel bar 344 can effectively hook or pry open the waste material adhering to the inner wall of the discharge bin 23 or the inner wall of the material seat 31, loosening it and causing it to fall. The falling waste material is then blown by the airflow along the upper inclined surface of the guide plate 334 to the discharge port.

[0044] This embodiment uses a material feeding component 34 with a swing spring 342 to convert the mechanical kinetic energy during punching into feeding power. Combined with airflow assistance, it forms a multi-layered protection mechanism of gravity feeding, airflow blowing, and mechanical feeding. Especially for thin and easily sticky FPC waste, this combination structure can ensure that every piece of waste can be effectively and thoroughly discharged, fundamentally eliminating waste residue, greatly improving the reliability and yield of equipment operation, and further reducing the need for manual intervention.

[0045] Example 4: Based on the above embodiments, this embodiment describes the collaborative workflow of each component and the resulting comprehensive technical effects.

[0046] In actual operation, the FPC material strip enters the punching area under the guidance of the material strip clamping strip 15. The upper mold moves downward under the action of external driving force. The guide post 12 first contacts the corresponding guide sleeve hole of the lower mold to ensure the mold closing accuracy. Then, the upper punching plate 14 presses the material strip through the material strip clamping strip 15, and the punching part 16 punches the FPC material downward, passes through the material drop groove of the lower mold plate 21 and goes deep into the material drop bin 23, completely punching and separating the lamp hole waste.

[0047] After separation, the waste falls into the trough of the material seat 31 below by gravity. Some of the waste falls directly onto the upper inclined surface of the guide plate 334 and slides down the inclined surface. The other part of the waste, which may remain on the inner wall of the material hopper 23 due to static electricity or adhesion, is propelled by the reciprocating swing of the material-pushing component 34 triggered by the punching action, thus detaching from the wall and falling down. At the same time, the air source equipment is activated, and the airflow passes through the adapter 332, the blowing pipe 331, and the diverter pipe 333. It is accelerated in the frustum structure of the flow collector 335 to form a high-speed directional airflow. This airflow blows out through the lower inclined surface of the guide plate 334, blowing the waste that has slid to the bottom of the trough toward the inclined discharge port on the left. On the other hand, the airflow also acts on the inclined surface of the blade 344, assisting it to make more effective pushing. The waste is finally discharged from the inclined discharge port to the external collection container.

[0048] This invention integrates the punch cutting part 1, the material mold part 2 and the material guiding part 3 into a single design. In particular, it uses a downward full-penetration punching method, combined with a high-efficiency blowing system consisting of a guide plate 334, a flow collector 335, a flow divider 333 and an air source device, and a mechanically assisted material dropping system consisting of a material feeding component 34 driven by a swing spring 342, thereby achieving fully automated processing of FPC glue lamp hole waste. This design eliminates the need for frequent manual shutdowns to clean up waste materials, significantly improving production efficiency while ensuring punching accuracy. It avoids dimensional deviations and quality issues caused by waste residue, effectively improves the workshop environment, reduces mold costs and customer complaint risks, and achieves the goal of efficient, precise, and stable production.

[0049] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention. The scope of protection claimed by the appended claims and their equivalents is defined.

Claims

1. A device for improving the cutting process of FPC adhesive blanking, characterized in that, include: The punch die-cutting part (1) includes an upper pad plate (11), an upper clamping plate (13) and an upper punch plate (14) installed from top to bottom. The upper pad plate (11) has guide posts (12) at its four corners, and the guide posts (12) pass through the interior of the upper clamping plate (13) and the upper punch plate (14) through through holes. The bottom end of the upper punch plate (14) is symmetrically equipped with two strip clips (15) for positioning the strip. The bottom center of the upper punch plate (14) is provided with a punch part (16) for opening holes. The mold part (2) includes a lower mold plate (21) for receiving FPC adhesive. The surface of the lower mold plate (21) is provided with a material discharge groove that is compatible with the punch (16). A lower pad plate (22) is provided below the lower mold plate (21), and a material discharge bin (23) is provided at the center of the lower pad plate (22) at a position that is compatible with the material discharge groove of the lower mold plate (21). The material guiding part (3) includes a material seat (31) located below the lower pad (22) for holding waste material. The bottom end of the material seat (31) is connected to a base (32). A drop groove is provided at the center of the material seat (31), and a blowing element (33) for blowing material is provided on one side of the inner wall of the drop groove.

2. The FPC adhesive blanking improvement and cutting process design device according to claim 1, characterized in that, The material holder (31) has an inclined discharge port on the left side of the trough. The blowing component (33) includes a guide plate (334). The left side of the guide plate (334) is set with a triangular tip. The upper inclined surface of the guide plate (334) is used to guide the falling material.

3. The FPC adhesive blanking improvement and cutting process design device according to claim 2, characterized in that, The guide plate (334) has several flow collectors (335) on its lower inclined surface. The flow collectors (335) are designed as hollow frustums, and the number of holes inside the flow collectors (335) gradually increases from left to right.

4. The FPC adhesive blanking improvement and cutting process design device according to claim 3, characterized in that, A number of diversion pipes (333) are provided at the corresponding position of the right hole of the flow collector (335), and the end of the diversion pipe (333) is connected to the blowing pipe (331). The end of the blowing pipe (331) is threaded with an adapter (332), and the end of the adapter (332) is provided with an air source device through a pipe.

5. The FPC adhesive blanking improvement and cutting process design device according to claim 3, characterized in that, The bottom of the inner wall of the material seat (31) is provided with several material feeding components (34), and the top of the material feeding component (34) extends into the interior of the material feeding bin (23), and the position of the material feeding component (34) is adapted to the position of several of the flow collection hoods (335).

6. The FPC adhesive blanking improvement cutting process design device according to claim 5, characterized in that, The material feeding component (34) includes a fixed plate (341) fixed to the inner wall of the material base (31), and a swing spring (342) is connected to the top of the fixed plate (341), an upper receiving plate (343) is connected to the top of the swing spring (342), and a cutting blade (344) is connected to the top of the upper receiving plate (343).

7. The FPC adhesive blanking improvement and cutting process design device according to claim 6, characterized in that, The blade (344) has inclined blade surfaces on both sides, and the inclined surfaces of the blade (344) are adapted to correspond to the flow collector (335).

8. The FPC adhesive blanking improvement and cutting process design device according to claim 6, characterized in that, The surface of the swing spring (342) is fitted with a rubber sleeve (345), and the upper and lower ends of the rubber sleeve (345) are respectively connected and fixed to the upper receiving plate (343) and the fixed plate (341).

9. The FPC adhesive blanking improvement and cutting process design device according to claim 1, characterized in that, The punch (16) punches downward into the material drop groove of the lower template (21) during punching and extends into the interior of the material drop bin (23).

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