A cutting, blowing, and feeding device for an organic light guide drum aluminum tube chamfering equipment.

Abstract

This invention discloses a cutting and blowing feeding device for an organic light guide drum aluminum tube chamfering equipment, belonging to the field of machine tool feeding technology. It includes a mounting frame installed on one side of the machine tool, with a material box mounted on the frame. A feeding unit is installed on the material box, and the feeding unit includes a push plate inserted into the material box. Through the feeding unit, a first cylinder drives the push plate to push the material upwards, allowing the short aluminum tubes after cutting and blowing to be transported to the slide table in an orderly and automatic manner. This achieves automated connection between the cutting and blowing process and the chamfering process, eliminating the need for manual feeding and improving processing efficiency and safety. Through the cooperation of the slide table, baffle, positioning column, and control components, precise single-tube feeding can be achieved: while the baffle releases the restriction on the foremost aluminum tube, the positioning column simultaneously inserts and locks the next aluminum tube, creating a safe gap between adjacent aluminum tubes. This fundamentally avoids problems such as squeezing, stacking, and jamming during clamping, significantly improving feeding stability.

Description

Technical Field

[0001] This invention relates to the field of machine tool loading technology, and in particular to a cutting and chip-blowing loading device for an organic optical guide drum aluminum tube chamfering equipment. Background Technology

[0002] Organic photoconductor drums are core components of imaging equipment such as laser printers and copiers. Their substrate is a high-precision thin-walled aluminum tube. During production, the aluminum tube needs to undergo processes such as long tube cutting, end face deburring, and chamfering at both ends to meet the requirements of subsequent photosensitive coating.

[0003] As the office equipment industry develops towards higher speed and precision, the requirements for automation level, workpiece integrity rate and production cycle in aluminum tube processing are constantly increasing, and traditional feeding methods are no longer suitable.

[0004] Currently, in the industry, aluminum tubes after chip removal are mostly fed into machine tools (beveling equipment) by manual placement, vibratory feeder feeding, or direct conveying through inclined channels. These methods generally have the following defects: 1. Disordered feeding and easy jamming: Aluminum tubes are densely packed in the channel without effective separation, which can easily cause stacking, squeezing, and posture deviation during clamping, leading to machine tool jamming or scrapping; 2. Easy damage to workpieces during clamping: The grippers are mostly driven by fixed stroke or constant force, which is not suitable for thin-walled soft aluminum tubes and can easily cause flattening, scratches, and elliptical deformation, directly reducing the yield of photoconductor drums. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that aluminum tubes are densely packed together in the material channel without effective separation, which easily leads to stacking, squeezing, and posture deviation during clamping, resulting in machine tool jamming or processing scrap. Therefore, a cutting and blowing feeding device for an organic light guide drum aluminum tube chamfering equipment is proposed.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A cutting and blowing feeding device for an organic light guide drum aluminum tube chamfering equipment includes a mounting frame installed on one side of the machine tool, a material box mounted on the mounting frame, a feeding unit installed on the material box, and a push plate inserted into the material box. The push plate is moved upward by a first cylinder installed inside the mounting frame to push the aluminum tube above it to move upward. The feeding unit also includes a slide table mounted on one side of the material box. Baffles are inserted into both sides of the slide table, and positioning posts corresponding to aluminum tubes are inserted into both sides of the slide table near the baffles. The baffle and the positioning post are moved outward and inward respectively by the control component mounted on the bottom of the slide table, so as to release the restriction of the foremost aluminum tube by the baffle and restrict the next aluminum tube by the positioning post, so that a gap is formed between the foremost aluminum tube and the next aluminum tube.

[0007] As a further description of the above technical solution: The control component includes two first racks slidably connected to one side of the inner bottom wall of the slide table. Two gears are rotatably connected to the side of the lower surface of the slide table near the two first racks. Two second racks are slidably connected to the side of the lower surface of the slide table near the two gears. The first racks and the second racks mesh with the gears respectively.

[0008] As a further description of the above technical solution: One end of each of the two first racks is fixed to one of the two baffles, and one end of each of the two second racks is fixed to one of the two positioning pins.

[0009] As a further description of the above technical solution: A movable seat is slidably connected to the middle of the lower surface of the slide table. Two connecting rods are rotatably connected to the lower surface of the movable seat via pins. One end of each of the two connecting rods is rotatably connected to two second racks. A second cylinder is mounted on the side of the lower surface of the slide table near the movable seat via a bracket, and one end of the second cylinder is connected to the movable seat.

[0010] As a further description of the above technical solution: The machine tool is equipped with a clamping unit on its inner top wall. The clamping unit includes a vertical frame that is slidably mounted on the inner top wall of the machine tool. A third cylinder with one end connected to the vertical frame is mounted in the middle of the inner top wall of the machine tool. A mounting plate is slidably connected to the surface of the vertical frame. A fourth cylinder with one end connected to the mounting plate is mounted in the middle of the vertical frame.

[0011] As a further description of the above technical solution: The mounting plate is equipped with a gripper assembly, which includes a top frame fixed to the mounting plate. A fifth cylinder is mounted on the top frame, and an I-beam is connected to one end of the fifth cylinder that passes through the top frame. Two gripper rods are rotatably connected to both sides of the top frame.

[0012] As a further description of the above technical solution: The four ends of the I-beam frame are rotatably connected to a control rod with one end rotatably connected to the claw rod, and the two sides of the upper surface of the top frame are threaded with limiting studs.

[0013] As a further description of the above technical solution: An operating opening is provided on the inner bottom wall of the slide near the exit end, and the width of the operating opening is greater than the width between the two claw bars in the open state.

[0014] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. Through the set feeding unit, the first cylinder drives the push plate to push the material upward, which can make the short aluminum tubes after cutting and blowing chips orderly and automatically transported to the slide table, realizing the automatic connection between the cutting and blowing chip process and the chamfering process, eliminating the need for manual feeding, and improving processing efficiency and safety. By coordinating the slide, baffle, positioning post and control components, precise single-tube feeding can be achieved: while the baffle releases the limit on the foremost aluminum tube, the positioning post simultaneously inserts and locks the next aluminum tube, creating a safe gap between adjacent aluminum tubes, fundamentally avoiding problems such as squeezing, stacking and jamming during clamping, and greatly improving feeding stability.

[0015] 2. Through the set clamping unit, the gripper assembly limits the upward stroke of the I-beam frame by setting the limiting stud, which can accurately control the clamping force of the gripper bar, avoid deformation and flattening of thin-walled aluminum tubes due to excessive clamping force, significantly improve the yield of aluminum tubes, and ensure the precision of organic photoconductor drum substrate. Attached Figure Description

[0016] Figure 1 A schematic diagram of a first perspective provided according to an embodiment of the present invention is shown; Figure 2 A schematic diagram showing the installation location of the control component provided according to an embodiment of the present invention is shown; Figure 3 A schematic diagram of the internal structure of the hopper provided according to an embodiment of the present invention is shown; Figure 4 A schematic diagram of the structure of a control component provided according to an embodiment of the present invention is shown; Figure 5 A schematic diagram of a gripper assembly for gripping an aluminum tube according to an embodiment of the present invention is shown; Figure 6 A schematic diagram of the mounting position of the gripper assembly provided according to an embodiment of the present invention is shown; Figure 7 A structurally disassembled schematic diagram of the gripper assembly provided according to an embodiment of the present invention is shown; Figure 8 A schematic diagram of the push plate after it has been moved upwards according to an embodiment of the present invention is shown; Figure 9 The present invention provides an embodiment of the invention. Figure 5 Enlarged view of point A in the middle; Figure 10 A schematic diagram of a planar structure provided according to an embodiment of the present invention is shown; Figure 11 A schematic diagram of a second perspective provided according to an embodiment of the present invention is shown.

[0017] Legend: 10. Machine tool; 11. Mounting bracket; 12. Material bin; 20. Feeding unit; 21. First cylinder; 22. Push plate; 23. Slide table; 24. Baffle; 25. Positioning column; 26. Control component; 261. First rack; 262. Gear; 263. Second rack; 264. Moving seat; 265. Connecting rod; 266. Second cylinder; 27. Operating port; 30. Gripping unit; 31. Vertical frame; 32. Third cylinder; 33. Fourth cylinder; 34. Gripper assembly; 341. Top frame; 342. Fifth cylinder; 343. I-beam frame; 344. Claw rod; 345. Control rod; 346. Limiting stud. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] like Figure 1 — Figure 11 As shown, the present invention provides: A cutting and blowing device for chamfering aluminum tubes of an organic light guide drum includes a mounting frame 11 installed on one side of a machine tool 10. It should be noted that the machine tool 10 is a device for chamfering aluminum tubes, which is prior art and will not be described in detail here. A material box 12 is mounted on the mounting frame 11. In particular, the bottom wall of the material box 12 is inclined to one side. The material box 12 is used to centrally place short aluminum tubes that have been cut and blown away by long aluminum tubes.

[0020] like Figure 1 , Figure 3 and Figure 8 As shown, a feeding unit 20 is installed on the material box 12. The feeding unit 20 includes a push plate 22 inserted into the material box 12. The push plate 22 is moved upward by a first cylinder 21 installed inside the mounting frame 11 to push the aluminum tube above it to move upward. The feeding unit 20 also includes a slide 23 mounted on one side of the material box 12. In particular, the inner bottom wall of the slide 23 is inclined, so that the aluminum tube pushed by the push plate 22 to the connection between the material box 12 and the slide 23 can roll to one side under the action of the inclined surface. Baffles 24 are inserted on both sides of the slide 23, and positioning posts 25 corresponding to the aluminum tube are inserted on the side of both sides of the slide 23 near the baffles 24. Specifically, in the initial state, the baffle 24 protrudes from the inner wall of the slide 23, while the positioning post 25 is retracted, with its end not protruding from the inner wall of the slide 23. This state is as follows: Figure 3As shown, in this state, when feeding, the first cylinder 21 pushes the push plate 22 to move upward. During the process, the push plate 22 will push the aluminum tube above it to move upward, so that the aluminum tube at the top moves upward to the connection between the material box 12 and the slide table 23. At this time, under the action of the tilting force, it slides down along the inclined surface of the slide table 23 until it abuts against the baffle 24. At this time, the aluminum tube is still a certain distance away from the outlet end of the slide table 23. In this state, the aluminum tube in the material box 12 continues to be pushed to the surface of the slide table 23, and the subsequent aluminum tubes will be blocked by the aluminum tubes that were previously there and on the surface of the slide table 23. The baffle 24 and the positioning post 25 are moved outward and inward respectively by the control component 26 mounted on the bottom of the slide table 23, so as to release the restriction of the baffle 24 on the foremost aluminum tube and restrict the next aluminum tube by the positioning post 25, so that a gap is formed between the foremost aluminum tube and the next aluminum tube.

[0021] like Figure 2 , Figure 3 and Figure 4 As shown, the control component 26 includes two first racks 261 slidably connected to one side of the inner bottom wall of the slide table 23. Two gears 262 are rotatably connected to the side of the lower surface of the slide table 23 near the two first racks 261. Two second racks 263 are slidably connected to the side of the lower surface of the slide table 23 near the two gears 262. The first racks 261 and the second racks 263 mesh with the gears 262 respectively. One end of each of the two first racks 261 is fixed to one of the two baffles 24, and one end of each of the two second racks 263 is fixed to one of the two positioning pins 25. A movable seat 264 is slidably connected to the middle of the lower surface of the slide table 23. Two connecting rods 265 are rotatably connected to the lower surface of the movable seat 264 via pins. One end of each of the two connecting rods 265 is rotatably connected to one of the two second racks 263. A second cylinder 266 is mounted on the side of the lower surface of the slide table 23 near the movable seat 264 via a bracket, and one end of the second cylinder 266 is connected to the movable seat 264. Specifically, the movable seat 264 is T-shaped. One end of the second cylinder 266 is connected to the vertical part of the movable seat 264, while one end of the connecting rod 265 is rotatably connected to the lower surface of the horizontal part of the movable seat 264. It should be noted that when the second cylinder 266 pushes the movable seat 264 toward the material box 12, the two connecting rods 265 move together. During the process, the angle between the two connecting rods 265 gradually decreases, and the position of the second cylinder 266 does not affect the angle change of the connecting rod 265. Specifically, since machine tool 10 can only chamfer one aluminum tube at a time, it can only clamp one aluminum tube into machine tool 10 at a time. To avoid squeezing the next aluminum tube when clamping the foremost aluminum tube, before clamping the foremost aluminum tube on the surface of slide table 23, the second cylinder 266 is activated to push the moving seat 264 towards the material box 12. During this process, the two connecting rods 265 will pull the two second racks 263 closer to each other, so that the two positioning pins 25 gradually insert into both ends of the second aluminum tube (the second aluminum tube is defined as the foremost aluminum tube). The aluminum tube following the tube is fixed in position. As the second rack 263 approaches each other, it drives the gear 262 to rotate, thereby driving the two first racks 261 to move away from each other. This causes the baffles 24 at their ends to move outward and no longer protrude from the inner wall of the slide table 23, thus releasing the restriction on the foremost aluminum tube. At this time, the foremost aluminum tube will slide to the outlet end of the slide table 23 by itself and be restricted to one side of the outlet end (during the process, the aluminum tube behind it is restricted by the positioning post 25, so the aluminum tube behind it will not slide with it). At this point, the second cylinder 266 drives the moving seat 264 to reset, so that the positioning column 25 and the baffle 24 return to their initial state. At this time, the aluminum tube on the surface of the slide table 23 will slide forward on its own. In this state, there is a gap between the aluminum tube at the outlet end and the aluminum tube restricted by the baffle 24, so that when the aluminum tube at the outlet end is clamped, it will not squeeze the aluminum tube behind. This process is repeated.

[0022] like Figure 1 , Figure 5 and Figure 6 As shown, a clamping unit 30 is mounted on the inner top wall of the machine tool 10. The clamping unit 30 includes a vertical frame 31 that is slidably mounted on the inner top wall of the machine tool 10. The vertical frame 31 is composed of two plates that are fitted together and fixed. A third cylinder 32 with one end connected to the vertical frame 31 is mounted in the middle of the inner top wall of the machine tool 10. A mounting plate is slidably connected to the surface of the vertical frame 31. A fourth cylinder 33 with one end connected to the mounting plate is mounted in the middle of the vertical frame 31.

[0023] like Figure 6 and Figure 7 As shown, a gripper assembly 34 is mounted on the mounting plate. The gripper assembly 34 includes a top frame 341 fixed to the mounting plate. A fifth cylinder 342 is mounted on the top frame 341. One end of the fifth cylinder 342, which passes through the top frame 341, is connected to an I-beam frame 343. Two claw rods 344 are rotatably connected to both sides of the top frame 341. An operating opening 27 is provided on the side of the inner bottom wall of the slide table 23 near the outlet end. The width of the operating opening 27 is greater than the width between the two claw rods 344 in the open state. Preferably, the end of the claw rod 344 is provided with an inner arc-shaped anti-slip pad to ensure that there is a certain friction between the claw rod 344 and the aluminum tube when the claw rod 344 grips the tube. Each of the four ends of the I-beam 343 is rotatably connected to a control rod 345, one end of which is rotatably connected to the claw rod 344. Both sides of the upper surface of the top frame 341 are threaded with limiting studs 346. In particular, the end of the limiting stud 346 that passes through the top frame 341 is provided with a contact plate to increase its contact area with the upper surface of the I-beam 343. At the same time, the lower surface of the contact plate is provided with a buffer pad. Both the anti-slip pad and the buffer pad are made of rubber to buffer when the I-beam 343 abuts against the contact plate. By setting the limiting stud 346, when its screw-in degree is different, the range of movement of the I-beam 343 driven by the fifth cylinder 342 will also be different. In actual use, the fifth cylinder 342 first controls the I-beam frame 343 to move upward, so that the control rod 345 drives the claw rods 344 to move closer to each other until the claw rods 344 can grip the aluminum tube and prevent the aluminum tube from falling (this process is used to determine the position where the claw rods 344 can grip the aluminum tube without excessively squeezing it). At this time, the limiting stud 346 is rotated so that the contact plate at its bottom end contacts the upper surface of the I-beam frame 343, so that the I-beam frame 343 can only move to this position when it moves later. This avoids excessive clamping force when the fifth cylinder 342 controls the claw rods 344 to grip the aluminum tube, and avoids deformation of the aluminum tube due to excessive clamping force during the gripping process. Specifically, when an aluminum tube moves to the exit end of the slide table 23, the third cylinder 32 pushes the vertical frame 31 to move the gripper assembly 34 outward to the top of the aluminum tube. Then, the fourth cylinder 33 drives the gripper assembly 34 downward to the two claw bars 344 on both sides of the aluminum tube. At this time, the fifth cylinder 342 is activated to control the I-beam frame 343 to move upward to abut against the contact plate at the bottom of the limiting stud 346. During this process, with the cooperation of the control lever 345, the two claw levers 344 are pulled closer to each other, so as to fit against the outer wall of the aluminum tube and complete the clamping operation. Then, the fourth cylinder 33 drives the claw assembly 34 to move upward, causing the clamped aluminum tube to be released from the slide table 23. Then, the third cylinder 32 pulls the vertical frame 31 to move the claw assembly 34 inward to the support seat on the surface of the machine tool 10 for placing the aluminum tube. Then, by controlling the claw assembly 34 to move downward, the aluminum tube is placed on the surface of the support seat and the clamping of the aluminum tube is released. After completing the above operations, reset the gripper assembly 34 to its initial state, then grip the next aluminum tube before the aluminum tube is chamfered, and after chamfering and transferring it from the machine tool 10, place the gripped next aluminum tube into the machine tool 10 according to the above operations, and repeat this process.

[0024] Specifically, the cutting, blowing, and feeding device of this organic optical guide drum aluminum tube chamfering equipment operates as follows: 1. Material preparation Short aluminum tubes that have been cut and blown out are placed into the material box 12. The bottom wall of the material box 12 is inclined so that the aluminum tubes naturally move towards the push plate 22. In the initial state, the baffle 24 protrudes from the inner wall of the slide table 23 and the positioning column 25 is in the retracted state. 2. Pushing material into slide 23 Start the first cylinder 21 to drive the push plate 22 to move upward, push the aluminum tube in the material box 12 upward, so that the uppermost aluminum tube enters the slide table 23 and rolls along the inclined bottom wall of the slide table 23 until it abuts against the baffle 24, completing the initial loading. 3. Single-piece material distribution and gap isolation The second cylinder 266 is activated, pushing the movable seat 264 towards the material box 12. The connecting rod 265 drives the two second racks 263 to move closer to each other, so that the positioning pins 25 are inserted into both ends of the second aluminum tube for positioning. At the same time, the second racks 263 drive the gears 262 to rotate, driving the first racks 261 to move away from each other, so that the baffle 24 retracts and releases the restriction on the foremost aluminum tube. The foremost aluminum tube slides alone to the exit end of the slide table 23, forming a gap with the rear aluminum tube. Then the second cylinder 266 resets, and the baffle 24 and the positioning pins 25 return to their initial state. 4. Automatic gripping and transfer The third cylinder 32 pushes the vertical frame 31 to move the gripper assembly 34 to the aluminum tube above the outlet end of the slide table 23. The fourth cylinder 33 drives the gripper assembly 34 to move down, so that the claw rod 344 extends into the operating port 27 and is located on both sides of the aluminum tube. The fifth cylinder 342 drives the I-beam frame 343 to move up. Under the action of the control rod 345, the claw rod 344 closes to clamp the aluminum tube. The I-beam frame 343 moves up until it contacts the bottom end of the limiting stud 346 and stops to ensure that the clamping force is moderate. 5. Feed the material into the machine tool for chamfering. The fourth cylinder 33 drives the gripper assembly 34 and the aluminum tube to move upward and disengage from the slide table 23. The third cylinder 32 pulls the vertical frame 31 to reset and moves the aluminum tube to the support seat above the machine tool 10. The fifth cylinder 342 resets, the claw bar 344 opens, and the aluminum tube is placed on the support seat, completing one loading cycle. 6. Cyclic operation The gripper assembly 34 resets and repeats the above steps of pushing, separating, gripping, and transferring to achieve continuous automatic feeding of aluminum tubes for chamfering.

[0025] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A cutting and blowing scrap feeding device of an organic photoconductor drum aluminum tube chamfering equipment, comprising a mounting frame (11) mounted on one side of a machine tool (10), a material box (12) is assembled on the mounting frame (11), characterized in that, The material box (12) is equipped with a feeding unit (20), which includes a push plate (22) inserted into the material box (12). The push plate (22) is moved upward by a first cylinder (21) installed inside the mounting frame (11) to push the aluminum tube above it to move upward. The feeding unit (20) also includes a slide (23) assembled on one side of the material box (12). Baffles (24) are inserted on both sides of the slide (23), and positioning posts (25) corresponding to aluminum tubes are inserted on the side of both sides of the slide (23) near the baffles (24). The baffle (24) and the positioning post (25) are moved outward and inward respectively by the control component (26) assembled at the bottom of the slide (23) to release the restriction of the foremost aluminum tube by the baffle (24) and restrict the next aluminum tube by the positioning post (25), so that a gap is formed between the foremost aluminum tube and the next aluminum tube.

2. The cutting, blowing, and feeding device for an organic optical guide drum aluminum tube chamfering equipment according to claim 1, characterized in that, The control component (26) includes two first racks (261) slidably connected to one side of the inner bottom wall of the slide (23). Two gears (262) are rotatably connected to the side of the lower surface of the slide (23) near the two first racks (261). Two second racks (263) are slidably connected to the side of the lower surface of the slide (23) near the two gears (262). The first racks (261) and the second racks (263) mesh with the gears (262) respectively.

3. The cutting, blowing, and feeding device for an organic optical guide drum aluminum tube chamfering equipment according to claim 2, characterized in that, One end of each of the two first racks (261) is fixed to one of the two baffles (24), and one end of each of the two second racks (263) is fixed to one of the two positioning pins (25).

4. The cutting and chip-blowing feeding device for an organic optical guide drum aluminum tube chamfering equipment according to claim 3, characterized in that, A movable seat (264) is slidably connected to the middle of the lower surface of the slide (23). Two connecting rods (265) are rotatably connected to the lower surface of the movable seat (264) by a pin. One end of the two connecting rods (265) is rotatably connected to two second racks (263). A second cylinder (266) is mounted on the side of the lower surface of the slide (23) near the movable seat (264) by a bracket, and one end of the second cylinder (266) is connected to the movable seat (264).

5. The cutting, blowing, and feeding device for an organic optical guide drum aluminum tube chamfering equipment according to claim 1, characterized in that, The machine tool (10) is equipped with a clamping unit (30) on its inner top wall. The clamping unit (30) includes a vertical frame (31) that is slidably mounted on the inner top wall of the machine tool (10). A third cylinder (32) connected to the vertical frame (31) is mounted in the middle of the inner top wall of the machine tool (10). A mounting plate is slidably connected to the surface of the vertical frame (31). A fourth cylinder (33) connected to the mounting plate is mounted in the middle of the vertical frame (31).

6. The cutting and blowing feeding device for an organic optical guide drum aluminum tube chamfering equipment according to claim 5, characterized in that, The mounting plate is equipped with a gripper assembly (34), which includes a top frame (341) fixed to the mounting plate. A fifth cylinder (342) is mounted on the top frame (341). The fifth cylinder (342) passes through one end of the top frame (341) and is connected to an I-beam frame (343). Two claw rods (344) are rotatably connected to both sides of the top frame (341).

7. The cutting and chip-blowing feeding device for an organic optical guide drum aluminum tube chamfering equipment according to claim 6, characterized in that, The four ends of the I-beam frame (343) are rotatably connected to a control rod (345) with one end rotatably connected to the claw rod (344), and the two sides of the upper surface of the top frame (341) are threaded with limiting studs (346).

8. The cutting, blowing, and feeding device for an organic optical guide drum aluminum tube chamfering equipment according to claim 7, characterized in that, An operation port (27) is provided on the inner bottom wall of the slide (23) near the outlet end, and the width of the operation port (27) is greater than the width between the two claw bars (344) in the open state.

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