Laptop foot pad trimming device

Abstract

The utility model discloses a notebook computer foot pad trimming device which comprises a notebook computer foot pad and further comprises a workbench, and a trimming station and a feeding and discharging station are arranged at the front end and the rear end of the top of the workbench respectively. The alternate feeding mechanism is installed on the top of the workbench and comprises a conveying assembly, a receding feeding assembly, a driving assembly and a positioning pin used for fixing notebook computer foot pads. The trimming mechanism is mounted on the trimming station and is used for trimming the notebook computer foot pad; the auxiliary pushing mechanism is installed on the feeding and discharging station and used for pushing the notebook computer foot pads away from the positioning pins. The alternate feeding mechanism achieves double-station alternate automatic feeding between the trimming station and the feeding and discharging station, the standby time of the trimming mechanism is shortened, and the working efficiency is improved. The trimming mechanism automatically trims the notebook computer foot pad and stores waste, manual trimming is not needed, operation is convenient and fast, the waste is stored and collected, and cleaning and recycling of the waste are facilitated.

Description

Technical Field

[0001] The utility model relates to the field of notebook foot pad processing, and particularly relates to a trimming device for notebook foot pads. Background Technique

[0002] The field of notebook foot pad processing mainly involves aspects such as material processing and forming technology, mold design and manufacturing, precision trimming technology, and quality inspection. After the foot pads are formed, trimming treatment is often required to remove excess burrs, flash, etc., so that the appearance of the foot pads is more tidy and beautiful. The trimming process includes various methods such as manual trimming and mechanical trimming. With the development of automation technology, more and more enterprises use automated trimming equipment to improve trimming efficiency and accuracy.

[0003] Chinese Patent CN214136333U discloses a trimming device for silicone foot pad processing, including an operating table. On both sides of the middle part of the top of the operating table, fixing blocks are fixedly connected. On one side of each of the two fixing blocks, a scraper is movably connected. On both sides of the top of the operating table, electric slide rails are fixedly installed. On the top of each of the two electric slide rails, a support plate is movably connected. On one side of the top of the support plate, a pressing plate is movably connected. The device fixedly installs electric slide rails on both sides of the top of the operating table. However, the device still has the following problems:

[0004] During the trimming process of the device, the trimming mechanism has a standby time during loading and unloading, reducing the trimming efficiency of the foot pads; after the device trims the foot pads, it cannot clean the waste of the foot pads, which is not conducive to the recycling of waste.

[0005] Based on this, the utility model designs a trimming device for notebook foot pads to solve the above problems. Content of the Utility Model

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides a trimming device for notebook foot pads.

[0007] To achieve the above purposes, the utility model is realized through the following technical solutions:

[0008] A trimming device for notebook foot pads, including notebook foot pads, and further including:

[0009] A workbench, with a trimming station and a loading and unloading station respectively provided at the front and rear ends of its top;

[0010] An alternating feeding mechanism is installed on the top of the workbench, and the alternating feeding mechanism includes a conveying assembly, a yielding feeding assembly, a driving assembly and a positioning pin for fixing the notebook foot pad. The driving assembly is arranged on the top of the workbench, and two groups of conveying assemblies are respectively arranged on both sides of the top of the workbench. The driving assembly is used to drive the two groups of conveying assemblies to synchronously move in opposite directions between the trimming station and the loading and unloading stations. The tops of the two groups of conveying assemblies are both provided with yielding feeding assemblies for placing the notebook foot pad and playing a role of avoidance. The tops of the yielding feeding assemblies are provided with positioning pins that are plugged into the openings of the notebook foot pad, and the tops of the positioning pins are provided with rounded corners for facilitating the insertion of the small holes of the notebook foot pad;

[0011] A trimming mechanism, which is installed on the trimming station and is used to trim the notebook foot pad;

[0012] The auxiliary pushing mechanism is installed on the loading and unloading station and is used to push the notebook foot pad away from the positioning pin.

[0013] Furthermore, the driving assembly includes a belt transmission structure, a slide groove 2 and a connecting block. The belt transmission structure is arranged on the lower side of the workbench. Two slide grooves 2 are symmetrically arranged on the top of the workbench. The connecting block is connected to the belt transmission structure. The connecting block passes through the slide groove 2 and slides in contact with the inner wall of the slide groove 2.

[0014] Furthermore, the belt transmission structure includes a motor, a driving wheel, a driven wheel and a belt. The driving wheel and the driven wheel are rotatably connected to the lower side of the workbench and are respectively located below the trimming station and the loading and unloading station. The motor is fixedly connected to the top of the workbench, and the output end of the motor passes through the workbench and is fixedly connected to the driving wheel. The driven wheel and the driving wheel are connected by a belt transmission.

[0015] Furthermore, the conveying assembly includes a guide rail and a supporting platform. The two guide rails are fixedly connected to the top of the workbench and are respectively located on the sides of the two slide grooves. The top of the guide rail is slidably connected to the supporting platform, and one end of the supporting platform is fixedly connected to the connecting block.

[0016] Furthermore, the yield feeding assembly includes guide rail 2, a feed block, a round rod, a round roller, a slide groove 1 and a yield groove. The top of each of the supporting platforms is fixedly connected to a guide rail 2 that is perpendicular to guide rail 1. The feed block is slidably connected to the top of the guide rail 2, the positioning pin is fixedly connected to the top of the feed block, one end of the round rod is connected to the bottom of the feed block, and the other end of the round rod is rotatably connected to a round roller. The top of the workbench is provided with a slide groove 1 on the side of each guide rail 1, and the middle part of the slide groove 1 has an avoidance section bent outward, the round roller rolls in the slide groove 1, and the supporting platform is provided with a yield groove for the round rod to slide.

[0017] Furthermore, the trimming mechanism includes a stand, a cylinder, an annular cutter, a waste box and a cutting knife. The stand is fixedly connected to the top of the workbench, the top of the stand is fixedly connected to the cylinder, the output end of the cylinder passes through the stand and is fixedly connected to the annular cutter, the blade of the annular cutter corresponds to the shape of the notebook foot pad, the waste box is fixedly connected to the top of the workbench, the waste box is located on the lower side of the annular cutter, and the sides of the annular cutter are fixedly connected with cutting knives for cutting waste.

[0018] Furthermore, the auxiliary pushing mechanism includes a second cylinder, a pushing block and a square groove. The second cylinder is fixedly connected to the top of the workbench, and the output end of the second cylinder is fixedly connected to a pushing block for pushing out the notebook foot pad. A square groove is provided on the feeding block next to the positioning pin.

[0019] Compared with the prior art, the utility model has the following beneficial effects:

[0020] In the utility model, the driving component drives two groups of conveying components to drive the giving way and loading components to move synchronously in the opposite direction, and the giving way and loading components drive the notebook foot pad to move between the loading and unloading stations and the trimming stations, and the two groups of giving way and loading components give way during the movement, so as to realize the alternating automatic loading of the double stations, reduce the standby time of the trimming mechanism, and improve the work efficiency; the positioning pin passes through the small hole of the notebook foot pad to position the notebook foot pad, prevents the notebook foot pad from shifting during the movement, and avoids the damage to the notebook foot pad caused by the trimming mechanism due to the shift; the trimming mechanism automatically trims the notebook foot pad and stores the waste generated by the trimming, and no manual trimming is required, the operation is convenient, the waste is stored and collected, and the waste is conveniently cleaned and recycled; the auxiliary pushing mechanism pushes the notebook foot pad to avoid excessive friction between the notebook foot pad and the positioning pin, which makes it impossible for the operator to remove the notebook foot pad in time, making the operation more convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] Figure 1 A three-dimensional device for trimming the edge of a notebook foot pad according to the utility model Figure 1 ;

[0023] Figure 2 This is a front view of a notebook foot pad trimming device of the utility model;

[0024] Figure 3It is a right view of a notebook foot pad trimming device of the utility model;

[0025] Figure 4 A three-dimensional device for trimming the edge of a notebook foot pad according to the utility model Figure 2 ;

[0026] Figure 5 A three-dimensional device for trimming the edge of a notebook foot pad according to the utility model Figure 3 ;

[0027] Figure 6 A three-dimensional device for trimming the edge of a notebook foot pad according to the utility model Figure 4 ;

[0028] Figure 7 A three-dimensional device for trimming the edge of a notebook foot pad according to the utility model Figure 5 .

[0029] The numbers in the figure represent:

[0030] 1. Workbench; 2. Alternating feeding mechanism; 21. Conveying assembly; 211. Guide rail 1; 212. Carrying platform; 22. Yielding feeding assembly; 221. Guide rail 2; 222. Feeding block; 223. Round rod; 224. Round roller; 225. Slide 1; 226. Yielding slot; 23. Driving assembly; 231. Motor; 232. Driving wheel; 233. Driven wheel; 234. Belt; 235. Slide 2; 236. Connecting block; 24. Positioning pin; 3. Trimming mechanism; 31. Stand; 32. Cylinder 1; 33. Annular cutter; 34. Waste box; 35. Cutting knife; 4. Auxiliary pushing mechanism; 41. Cylinder 2; 42. Pushing block; 43. Square slot; 5. Laptop foot pad. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0032] The terms “left”, “right”, “front”, “back”, “up” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0033] In some embodiments, please refer to the attached instructions. Figures 1-6 A notebook foot pad trimming device includes a notebook foot pad 5, a workbench 1, an alternating feeding mechanism 2, a trimming mechanism 3 and an auxiliary pushing mechanism 4.

[0034] At the front and rear ends of the top of the workbench 1, there are respectively a trimming station and a loading and unloading station.

[0035] The alternating loading mechanism 2 is installed on the top of the workbench 1. The alternating loading mechanism 2 includes a conveying component 21, a yielding loading component 22, a driving component 23, and a positioning pin 24 for fixing the laptop foot pad 5. The driving component 23 is arranged on the top of the workbench 1. On both sides of the top of the workbench 1, there are two groups of conveying components 21 respectively. The driving component 23 is used to drive the two groups of conveying components 21 to move synchronously and reversely back and forth between the trimming station and the loading and unloading station. On the top of both groups of conveying components 21, there is a yielding loading component 22 for placing the laptop foot pad 5 and playing a role of avoidance. On the top of the yielding loading component 22, there is a positioning pin 24 that is inserted in cooperation with the opening of the laptop foot pad 5, and at the top of the positioning pin 24, there is a rounded corner for facilitating the insertion of the small hole of the laptop foot pad 5.

[0036] The trimming mechanism 3 is installed at the trimming station and is used for trimming the laptop foot pad 5.

[0037] The auxiliary pushing mechanism 4 is installed at the loading and unloading station and is used to push the laptop foot pad 5 away from the positioning pin 24.

[0038] In the present utility model, when the operator inserts the laptop foot pad 5 into the positioning pin 24 and places it on the yielding loading component 22, the driving component 23 drives the two groups of conveying components 21 to move synchronously and reversely between the loading and unloading station and the trimming station. When a group of conveying components 21 drives the yielding loading component 22 to be located at the trimming station, the trimming mechanism 3 trims the laptop foot pad 5, while the other group of conveying components 21 drives the yielding loading component 22 to be located at the loading and unloading station, and the operator inserts the laptop foot pad 5 into the positioning pin 24 and places it on the yielding loading component 22; after the trimming mechanism 3 completes the trimming work on the laptop foot pad 5, the driving component 23 drives the two groups of conveying components 21 to move synchronously and reversely, exchange the positions they are in, and during the movement, the yielding loading components 22 yield to each other to avoid collision between the yielding loading components 22, so that the trimmed laptop foot pad 5 moves to the loading and unloading station, and the auxiliary pushing mechanism 4 pushes out the laptop foot pad 5. The operator places a new laptop foot pad 5 on the yielding loading component 22, and the trimming mechanism 3 trims the laptop foot pad 5 that has moved to the trimming station.

[0039] In the utility model, the driving component 23 drives the two groups of conveying components 21 to drive the giving way loading components 22 to move synchronously in the opposite direction, and the giving way loading components 22 drive the notebook foot pad 5 to move between the loading and unloading stations and the trimming stations, and the two groups of giving way loading components 22 give way during the movement, so as to realize the alternating automatic loading of the double stations, reduce the standby time of the trimming mechanism 3, and improve the working efficiency; the positioning pin 24 passes through the small hole of the notebook foot pad 5 to position the notebook foot pad 5, prevent the notebook foot pad 5 from shifting during the movement, and avoid the damage to the notebook foot pad 5 caused by the trimming mechanism 3 due to the shift; the trimming mechanism 3 automatically trims the notebook foot pad 5 and stores the waste generated by the trimming, without manual trimming, and the operation is convenient, the waste can be stored and collected, and the waste can be cleaned and recycled conveniently; the auxiliary pushing mechanism 4 pushes the notebook foot pad 5 to avoid excessive friction between the notebook foot pad 5 and the positioning pin 24, so that the operator cannot remove the notebook foot pad 5 in time, making the operation more convenient.

[0040] The driving assembly 23 includes a belt transmission structure, a second slide groove 235 and a connecting block 236. The belt transmission structure is arranged on the lower side of the workbench 1. Two second slide grooves 235 are symmetrically arranged on the top of the workbench 1. The connecting block 236 is connected to the belt transmission structure. The connecting block 236 passes through the second slide groove 235 and slides in contact with the inner wall of the second slide groove 235.

[0041] The belt drive structure includes a motor 231, a driving wheel 232, a driven wheel 233 and a belt 234. The driving wheel 232 and the driven wheel 233 are rotatably connected to the lower side of the workbench 1 and are respectively located below the trimming station and the loading and unloading station. The motor 231 is fixedly connected to the top of the workbench 1. The output end of the motor 231 passes through the workbench 1 and is fixedly connected to the driving wheel 232. The driven wheel 233 and the driving wheel 232 are connected through a belt 234.

[0042] The conveying assembly 21 includes a guide rail 211 and a supporting platform 212. The two guide rails 211 are fixedly connected to the top of the workbench 1 and are respectively located beside the two slide grooves 235. The top of the guide rail 211 is slidably connected to the supporting platform 212, and one end of the supporting platform 212 is fixedly connected to the connecting block 236.

[0043] The yield loading assembly 22 includes a guide rail 221, a feed block 222, a round rod 223, a round roller 224, a slide groove 225 and a yield groove 226. The top of each supporting platform 212 is fixedly connected to a guide rail 221 perpendicular to the guide rail 211. The feed block 222 is slidably connected to the top of the guide rail 221. The positioning pin 24 is fixedly connected to the top of the feed block 222. One end of the round rod 223 is connected to the bottom of the feed block 222. The other end of the round rod 223 is rotatably connected to the round roller 224. The top of the workbench 1 is located beside each guide rail 211 and a slide groove 225 is provided. The middle part of the slide groove 225 has an avoidance section bent outward. The round roller 224 rolls in the slide groove 225. The supporting platform 212 is provided with a yield groove 226 for the round rod 223 to slide.

[0044] In the present invention, when the operator inserts the notebook foot pad 5 into the positioning pin 24 and places it on the feeding block 222, the motor 231 drives the driving wheel 232 to rotate, and the driving wheel 232 drives the two connecting blocks 236 to move synchronously in the opposite direction between the loading and unloading station and the trimming station under the limiting action of the second slide groove 235 through the belt 234, and the connecting block 236 drives the bearing platform 212 to move, and the bearing platform 212 drives the guide rail 221 and the feeding block 222 to move, and the feeding block 222 drives the round rod 223 to move, and the round rod 223 drives the round roller 224 to roll along the slide groove 1 225, and when the round roller 224 rolls from the straight groove to the avoidance section in the slide groove 1 225, the round roller 224 drives the round rod 2 23 moves outward from the yield groove 226, and the round rod 223 drives the feeding block 222 to move outward under the limiting action of the guide rail 221, so as to realize the offset yield between the feeding blocks 222; when the round roller 224 rolls from the avoidance section to the straight groove at the other end in the slide groove 1 225, the round roller 224 drives the round rod 223 to deviate inward to the yield groove 226, and the round rod 223 drives the feeding block 222 to move inward. When the round roller 224 moves to the end of the slide groove 1 225, one feeding block 222 drives the notebook foot pad 5 to the trimming station, and the other feeding block 222 drives the notebook foot pad 5 to the loading and unloading station, so as to realize the double-station alternating automatic loading and continuous trimming of the notebook foot pad 5.

[0045] In the utility model, driven by the motor 231, the two connecting blocks 236 drive the supporting platform 212 and the feeding block 222 to move synchronously in the opposite direction. The feeding block 222 cooperates with the positioning pin 24 to position the notebook pad 5, thereby realizing the double-station alternating automatic loading of the notebook pad 5, reducing the standby time of the trimming mechanism 3 and improving the work efficiency. During the movement of the feeding block 222, the round rod 223 and the round roller 224 are driven to move. During the sliding process of the slide groove 225, the round roller 224 drives the feeding block 222 to deviate and give way through the straight groove and the avoidance section, thereby avoiding the collision of the feeding block 222 during the double-station alternating automatic loading.

[0046] The trimming mechanism 3 includes a vertical frame 31, a first cylinder 32, an annular cutting tool 33, a waste box 34 and a cutting knife 35. The vertical frame 31 is fixedly connected to the top of the workbench 1. A first cylinder 32 is fixedly connected to the top of the vertical frame 31. The output end of the first cylinder 32 passes through the vertical frame 31 and is fixedly connected to an annular cutting tool 33. The blade of the annular cutting tool 33 corresponds to the shape of the laptop foot pad 5. The waste box 34 is fixedly connected to the top of the workbench 1. The waste box 34 is located below the annular cutting tool 33. Cutting knives 35 for cutting waste are fixedly connected to the sides of the annular cutting tool 34.

[0047] In the present utility model, when the feeding block 222 sends the laptop foot pad 5 to the trimming station below the annular cutting tool 33, the output end of the first cylinder 32 pushes the annular cutting tool 33 downward to trim the laptop foot pad 5, and the cutting knife 35 cuts the waste generated by trimming so that it falls into the waste box 34 below, facilitating the cleaning and recycling of the waste.

[0048] The auxiliary feeding mechanism 4 includes a second cylinder 41, a pushing block 42 and a square groove 43. The second cylinder 41 is fixedly connected to the top of the workbench 1. The output end of the second cylinder 41 is fixedly connected to a pushing block 42 for pushing out the laptop foot pad 5. A square groove 43 is provided on the feeding block 222 beside the positioning pin 24.

[0049] In the present utility model, when the feeding block 222 sends the laptop foot pad 5 to the loading and unloading station above the second cylinder 41, the output end of the second cylinder 41 pushes the pushing block 42 upward. The pushing block 42 passes through the square groove 43 to push out the laptop foot pad 5. After the operator takes out the laptop foot pad 5, the output end of the second cylinder 41 drives the pushing block 42 to reset. The pushing block 42 pushes out the laptop foot pad 5, avoiding the problem that it is inconvenient to take out due to excessive friction between the laptop foot pad 5 and the positioning pin 24, and improving the working efficiency of the operator.

[0050] The above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit it; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present utility model.

Claims

1. A trimming device for laptop foot pads, including laptop foot pads (5), characterized in that, Also included are: A workbench (1) with a trimming station and a loading / unloading station respectively provided at the front and rear ends of its top; An alternating loading mechanism (2) installed on the top of the workbench (1). The alternating loading mechanism (2) includes a conveying component (21), a yielding loading component (22), a driving component (23), and a positioning pin (24) for fixing the laptop foot pad (5). The driving component (23) is provided on the top of the workbench (1). Two groups of conveying components (21) are respectively provided on both sides of the top of the workbench (1). The driving component (23) is used to drive the two groups of conveying components (21) to move synchronously and reversely between the trimming station and the loading / unloading station. Yielding loading components (22) for placing the laptop foot pad (5) and playing a yielding role are provided on the tops of the two groups of conveying components (21). A positioning pin (24) that is inserted in cooperation with the opening of the laptop foot pad (5) is provided on the top of the yielding loading component (22), and a rounded corner facilitating the insertion of the small hole of the laptop foot pad (5) is provided on the top of the positioning pin (24); A trimming mechanism (3) installed at the trimming station for trimming the laptop foot pad (5); An auxiliary pushing mechanism (4) installed at the loading / unloading station for pushing the laptop foot pad (5) away from the positioning pin (24).

2. The notebook foot pad trimming device according to claim 1, characterized in that, The driving component (23) includes a belt transmission structure, a second chute (235), and a connecting block (236). The belt transmission structure is provided on the lower side of the workbench (1). Two second chutes (235) are symmetrically provided on the left and right of the top of the workbench (1). The connecting block (236) is connected to the belt transmission structure, and the connecting block (236) passes through the second chute (235) and fits and slides with the inner wall of the second chute (235).

3. The notebook foot pad trimming device according to claim 2, characterized in that The belt transmission structure includes a motor (231), a driving wheel (232), a driven wheel (233), and a belt (234). The driving wheel (232) and the driven wheel (233) are rotatably connected to the lower side of the workbench (1) and are respectively located below the trimming station and the loading / unloading station. The motor (231) is fixedly connected to the top of the workbench (1). The output end of the motor (231) passes through the workbench (1) and is fixedly connected to the driving wheel (232). The driven wheel (233) and the driving wheel (232) are connected by the belt (234) for transmission.

4. The notebook foot pad trimming device according to claim 3, characterized in that The conveying component (21) includes a first guide rail (211) and a carrier (212). The two first guide rails (211) are fixedly connected to the top of the workbench (1) and are respectively located beside the two second chutes (235). A carrier (212) is slidably connected to the top of the first guide rail (211). One end of the carrier (212) is fixedly connected to the connecting block (236).

5. The notebook foot pad trimming device according to claim 4, characterized in that, The yielding loading assembly (22) comprises a second guide rail (221), a feeding block (222), a round rod (223), a round roller (224), a first slide groove (225) and a yielding groove (226); the top of each of the bearing platforms (212) is fixedly connected to a second guide rail (221) perpendicular to the first guide rail (211); the feeding block (222) is slidably connected to the top of the second guide rail (221); the positioning pin (24) is fixedly connected to the top of the feeding block (222); the round rod One end of the round rod (223) is connected to the bottom of the feeding block (222), and the other end of the round rod (223) is rotatably connected to a round roller (224). The top of the workbench (1) is provided with a slide groove (225) next to each guide rail (211), and the middle part of the slide groove (225) has an escape section bent outward, and the round roller (224) rolls in the slide groove (225). The support platform (212) is provided with a clearance groove (226) for the round rod (223) to slide.

6. The trimming device for the notebook foot pad according to claim 5, characterized in that, The trimming mechanism (3) comprises a stand (31), a cylinder (32), an annular cutter (33), a waste box (34) and a cutting knife (35); the stand (31) is fixedly connected to the top of the workbench (1); the cylinder (32) is fixedly connected to the top of the stand (31); the output end of the cylinder (32) passes through the stand (31) and is fixedly connected to the annular cutter (33); the blade of the annular cutter (33) corresponds to the shape of the notebook foot pad (5); the waste box (34) is fixedly connected to the top of the workbench (1); the waste box (34) is located at the lower side of the annular cutter (33); and the side edges of the annular cutter (33) are fixedly connected to the cutting knife (35) for cutting off waste.

7. The notebook foot pad trimming device according to claim 6, characterized in that, The auxiliary material pushing mechanism (4) comprises a second cylinder (41), a pushing block (42) and a square groove (43); the second cylinder (41) is fixedly connected to the top of the workbench (1); the output end of the second cylinder (41) is fixedly connected to the pushing block (42) for pushing out the notebook foot pad (5); and the feeding block (222) is provided with a square groove (43) next to the positioning pin (24).

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