Continuous slitting device for foam production

Abstract

The invention discloses a continuous slitting device for foam production, and belongs to the technical field of foam production, the continuous slitting device comprises a machine body, a locking part is arranged on the upper side of the machine body, the locking part comprises a material receiving roller arranged on the right side of the upper end of the machine body, a plurality of through grooves are formed in the outer surface of the material receiving roller in a penetrating mode, and a first moving groove is formed in the lower side of the interior of the material receiving roller; a first moving groove is formed in the upper side of the interior of the through groove, a second moving groove is formed in the upper side of the interior of the first moving groove, a pushing strip is slidably connected to the interior of the first moving groove, and an extrusion strip is slidably connected to the interior of the second moving groove. Through the arrangement of the through grooves, the extrusion strips can enter the through grooves to lock the foam, manual intervention is not needed in the locking process, accurate initial connection of the foam in the slitting process is achieved, the production efficiency is improved, meanwhile, the deformation and pollution problems caused by manual pulling are avoided, and the product quality of the foam is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of foam production, and more specifically, to a continuous slitting apparatus for foam production. Background Technology

[0002] Foam is a porous elastic material, typically made from plastics (such as polyethylene, polyurethane, and polyvinyl chloride) or rubber foam. Due to its lightweight, softness, shock absorption, sound insulation, and heat insulation properties, it is widely used in industrial, residential, and medical fields. Foam is categorized into PU foam, antistatic foam, conductive foam, EPE, antistatic EPE, CR, EVA, crosslinked PE, SBR, EPDM, etc. Foam possesses a range of characteristics including elasticity, light weight, rapid pressure-sensitive fixing, ease of use, flexible bending, ultra-thin size, and reliable performance.

[0003] Foam cutting equipment is a specialized machine for cutting foam materials. Its technology is primarily based on CNC (Computer Numerical Control) technology, using computer programming to control the cutting path and depth, achieving high-precision and high-efficiency cutting. This equipment is typically equipped with a high-precision cutting head, such as one with a cutting accuracy of 0.1mm, ensuring smooth and neat cut edges and reducing material waste. Furthermore, the introduction of CNC technology allows foam cutting equipment to adapt to various complex shapes, greatly improving production flexibility and versatility.

[0004] In the existing technology, during the continuous slitting process of foam, the initial connection between the foam and the take-up roller (i.e., "feeding" or "feeding") usually requires manual operation, which depends on the operator's experience and is inefficient. At the same time, manual pulling can cause the foam to stretch and deform or become contaminated (hand sweat, dust). Summary of the Invention

[0005] In view of the problems existing in the prior art, the purpose of this invention is to provide a continuous slitting device for foam production.

[0006] To solve the above problems, the present invention adopts the following technical solution, which can realize the locking of foam by the extrusion strip entering the through groove, and the locking process does not require manual intervention, thus realizing the precise initial connection of foam during cutting.

[0007] A continuous slitting device for foam production includes a machine body and a feeding roller located on the upper left side of the machine body. A slitting component is located at the center of the upper end of the machine body, and a locking component is provided on the upper side of the machine body. The locking component includes a take-up roller located on the upper right side of the machine body. Multiple through slots are formed on the outer surface of the take-up roller. A first moving slot is formed on the lower inner side of the take-up roller. A second moving slot is formed on the upper inner side of the first moving slot. A push bar is slidably connected inside the first moving slot. A pressing bar is slidably connected inside the second moving slot. The inclined surface of the push bar and the inclined surface of the pressing bar are in sliding and pressing contact. First magnetic blocks are fixedly connected to both the front and rear sides of the left end of the push bar. Multiple tension springs are fixedly connected between the left inner left side of the first moving slot and the left side of the push bar. A moving seat is slidably connected to the lower inner side of the machine body. Second magnetic blocks are fixedly connected to both the front and rear sides of the right vertical end of the moving seat.

[0008] Furthermore, a control box is fixedly connected to the front side of the machine body, the first moving groove is connected to the through groove through the second moving groove, the first magnetic block and the second magnetic block are magnetically repelled, the right side of the moving seat is arc-shaped, and the shape of the right side of the moving seat is adapted to the shape of the receiving roller receiving part.

[0009] Furthermore, the right side of the movable seat is provided with multiple guide grooves, the height of the left and right adjacent guide grooves is adapted to the height of the through groove, and the left and right adjacent guide grooves and through groove are on the same horizontal line.

[0010] Furthermore, the inner and outer sides of the machine body are provided with a material fixing component, which includes a cover plate fixedly connected to the upper side of the movable seat.

[0011] Furthermore, a glass plate is fixedly connected between the right side of the cover plate and the left side of the vertical part of the movable seat. Fixing blocks are fixedly connected to both the front and rear sides of the upper part of the cover plate. Slider blocks are fixedly connected to both the front and rear sides of the movable seat. Slide grooves are opened on both the front and rear sides of the inner part of the machine body. The slider is slidably connected inside the slide groove. A pressure sensor is fixedly connected to the right side of the inner part of the slide groove. After the right side of the slider moves, it presses against the left side of the pressure sensor. Electric push rods are fixedly connected to both the front and rear sides of the upper part of the machine body. The telescopic end of the electric push rod is fixedly connected to the left side of the fixing block.

[0012] Furthermore, a detection component is provided on both the inner and outer sides of the movable seat, and the detection component includes multiple partitions fixedly connected to the lower inner side of the movable seat.

[0013] Furthermore, limit switches are fixedly connected to the opposite surfaces of the front and rear partitions, and multiple warning lights are fixedly connected to the upper side of the cover plate, with the warning lights positioned above the two corresponding partitions.

[0014] Furthermore, a cleaning assembly is provided on the upper side of the horizontal part of the movable seat and on the inner and outer sides of the cover plate, the cleaning assembly including a hollow cavity opened inside the cover plate.

[0015] Furthermore, a pressure booster is fixedly connected to the upper side of the cover plate, and a conduit is fixedly connected to the back side of the pressure booster. The other end of the conduit is connected to an external air supply device, and a connecting pipe is fixedly connected through a rectangular array arranged inside the lower side of the hollow cavity.

[0016] Furthermore, limiting strips are fixedly connected to the opposite faces of the front and rear adjacent partitions. The limiting strips are in the shape of an "L". The connecting pipes in the same row pass through the horizontal part of the limiting strips together. The lower side of the vertical part of the limiting strips is flush with the upper side of the inside of the guide groove.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention locks the foam after the push plate enters the through groove. Due to the pressure of the push bar, the extrusion bar can enter the through groove to lock the foam. The locking process does not require manual intervention, which realizes the precise initial connection of the foam during cutting, improves production efficiency, and avoids the deformation and pollution problems caused by manual pulling, so that the product quality of the foam is guaranteed.

[0018] (2) The present invention connects the movable seat with the receiving roller under the push of the electric push rod. At the same time, the pressure sensor will provide feedback on the position of the movable seat according to the pressure state. Since the foam can indicate the state of the foam through precise pressure feedback during the movement, it can be determined whether the foam has completed the connection with the receiving roller, which improves the accuracy and stability of foam receiving. At the same time, the electric push rod can quickly adjust the fixed block by pulling it, further ensuring the initial connection efficiency of the foam.

[0019] (3) The present invention delivers pressurized air through the connection and blows away the debris adsorbed by the foam. Since the slit foam can be separated by the partition, the limit switch set on the side of the partition can monitor the status of the foam in real time. When the foam is abnormal during the movement, the warning light in the corresponding area will light up, so as to accurately find the abnormal foam and ensure the initial connection efficiency of the foam again. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a cross-sectional structural diagram of the present invention; Figure 3 For the present invention Figure 2 A magnified diagram of A; Figure 4 This is a cross-sectional view of the movable base of the present invention; Figure 5 For the present invention Figure 4 Enlarged schematic diagram of B; Figure 6 This is a cross-sectional view of the through groove of the present invention; Figure 7 This is a schematic diagram of the rear cross-sectional structure of the receiving roller of the present invention; Figure 8 This is a front cross-sectional view of the receiving roller of the present invention.

[0021] Explanation of the labels in the diagram: 1. Machine body; 11. Feeding roller; 12. Slitting piece; 13. Control box; 2. Locking component; 21. Receiving roller; 22. Through groove; 23. First moving groove; 24. Second moving groove; 25. Extrusion bar; 26. Push bar; 261. Tension spring; 27. First magnetic block; 28. Moving seat; 29. ​​Second magnetic block; 3. Guide groove; 4. Fixed component; 41. Cover plate; 42. Glass plate; 43. Fixing block; 44. Sliding block; 45. Slide groove; 46. Pressure sensor; 47. Electric push rod; 48. Detection component; 481. Partition plate; 482. Limit switch; 483. Warning light; 49. Cleaning component; 491. Hollow cavity; 492. Pressure boosting component; 493. Conduit; 494. Connecting pipe; 495. Limiting bar. Detailed Implementation

[0022] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0023] Please see Figures 1 to 8 A continuous slitting device for foam production includes a machine body 1 and a feeding roller 11 located on the upper left side of the machine body 1. A slitting component 12 is located at the center of the upper end of the machine body 1, and a locking component 2 is located on the upper side of the machine body 1. The locking component 2 includes a take-up roller 21 located on the upper right side of the machine body 1. The outer surface of the take-up roller 21 has multiple through grooves 22. The lower inner side of the take-up roller 21 has a first moving groove 23. The upper inner side of the first moving groove 23 has a second moving groove 24. A pusher bar 26 is slidably connected inside the first moving groove 23. An extrusion bar 25 is slidably connected inside the second moving groove 24. The inclined surface of the pusher bar 26 and the inclined surface of the extrusion bar 25 slide and press against each other. The front and rear sides of the left end of the pusher bar 26 are fixedly connected to the first magnetic block 27. Multiple tension springs 261 are fixedly connected between the left inner side of the first moving groove 23 and the left side of the pusher bar 26. A moving seat 28 is slidably connected to the lower inner side of the machine body 1. The front and rear sides of the right vertical part of the moving seat 28 are fixedly connected to the second magnetic block 29.

[0024] A control box 13 is fixedly connected to the front side of the machine body 1. The first moving groove 23 is connected to the through groove 22 through the second moving groove 24. The first magnetic block 27 and the second magnetic block 29 repel each other magnetically. The right side of the moving seat 28 is arc-shaped and the shape of the right side of the moving seat 28 is adapted to the shape of the receiving part of the receiving roller 21.

[0025] Multiple guide grooves 3 are provided through the right side of the movable seat 28. The height of the left and right adjacent guide grooves 3 is adapted to the height of the through groove 22, and the left and right adjacent guide grooves 3 and the through groove 22 are on the same horizontal line.

[0026] The inner and outer sides of the machine body 1 are equipped with a material fixing component 4.

[0027] By adopting the above technical solution, after the machine body 1 controls the feeding roller 11 to convey the foam, the foam will pass through the slitting part 12. The slitting foam will reach the top of the moving seat 28 under the push of the subsequent foam and gradually enter the guide groove 3. As the fixing part 4 controls the moving seat 28 to move together with the foam, as the moving seat 28 approaches the receiving roller 21, the second magnetic block 29 on the right side of the moving seat 28 gradually approaches the first magnetic block 27 on the left side of the push bar 26 in the receiving roller 21. Because the first magnetic block 27 and the second magnetic block 29 are magnetically repelled, the repulsive force generated by the second magnetic block 29 pushes the first magnetic block 27, causing the push bar 26 to slide to the right in the first moving groove 23. When the push bar 26 moves to the right, its inclined surface presses the inclined surface of the extrusion bar 25, causing the extrusion bar 25 to slide upward in the second moving groove 24 and enter the through groove 22. At this time, the foam that enters the through groove 22 will be squeezed by the extrusion bar 25, realizing the automatic connection between the foam and the receiving roller 21. When the foam needs to be removed or readjusted, the fixed part 4 drives the moving seat 28 to move to the left, the second magnetic block 29 moves away from the first magnetic block 27, and under the action of the tension spring 261, the push bar 26 slides to the left to reset, and the extrusion bar 25 also slides down and retracts into the second moving groove 24, releasing the fixation of the foam. Because the right side of the moving seat 28 is arc-shaped and matches the shape of the receiving roller 21, and the guide groove 3 on the right side matches the height of the through groove 22 and is on the same horizontal line, the foam can move stably along the path during the movement, avoiding deviation or jamming. Because the inclined surface of the push bar 26 extrudes the extrusion bar 25, the extrusion bar 25 can enter the through groove 22 to lock the foam, and the locking process does not require manual intervention, realizing the precise initial connection of the foam during cutting, improving production efficiency, and avoiding deformation and pollution problems caused by manual pulling, so as to ensure the product quality of the foam.

[0028] like Figures 1 to 5 As shown, the inner and outer sides of the machine body 1 are provided with a material fixing component 4, which includes a cover plate 41 fixedly connected to the upper side of the movable seat 28.

[0029] A glass plate 42 is fixedly connected between the right side of the cover plate 41 and the left side of the vertical part of the movable seat 28. Fixing blocks 43 are fixedly connected to the front and rear sides of the upper end of the cover plate 41. Slider 44 is fixedly connected to the front and rear sides of the movable seat 28. Slide grooves 45 are opened on the front and rear sides inside the body 1. The slider 44 is slidably connected inside the slide groove 45. A pressure sensor 46 is fixedly connected to the right side inside the slide groove 45. After the right side of the slider 44 moves, it presses against the left side of the pressure sensor 46. Electric push rods 47 are fixedly connected to the front and rear sides of the upper end of the body 1. The telescopic end of the electric push rod 47 is fixedly connected to the left side of the fixing block 43.

[0030] By adopting the above technical solution, after the slit foam enters the guide trough 3, the foam will be between the cover plate 41 and the moving seat 28. At this time, the glass plate 42 on the right side of the cover plate 41 allows the operator to directly observe the state of the foam during the movement. Subsequently, the controller will control the electric push rod 47 to push the fixed block 43. At this time, the sliders 44 on both sides of the moving seat 28 will slide in the slide groove 45 inside the machine body 1. When the right arc surface of the moving seat 28 contacts the receiving roller 21, the foam continues to move and enters the through groove 22. At this time, the slider 44 will contact the pressure sensor 46. The pressure sensor 46 will transmit the pressure signal it senses to the control box 13. The control box 13 judges whether the pressure is within the normal range according to the preset parameters. If the pressure is normal, it means that the foam feeding position is accurate, and the equipment continues to operate normally. Before rotation begins, the electric push rod 47 pulls the fixed block 43, causing the moving seat 28 to gradually return to its original position. If the pressure is abnormal, it indicates that the foam has shifted or jammed. The control box 13 will issue a command to adjust the action of the electric push rod 47, causing the moving seat 28 to be fine-tuned so that more foam is exposed on the outside of the guide groove 3. Continuous movement of the foam will push the jammed or shifted parts, but the guide groove 3 will still restrict the position of the foam, so that the foam will reconnect with the receiving roller 21. Since the foam can indicate its status through precise pressure feedback during movement, it can be determined whether the foam has completed the connection with the receiving roller 21, which improves the accuracy and stability of foam receiving. At the same time, the electric push rod 47 can quickly adjust the fixed block 43, further ensuring the initial connection efficiency of the foam.

[0031] like Figures 1 to 4 As shown, the inner and outer sides of the movable base 28 are provided with a detection component 48, which includes multiple partitions 481 fixedly connected to the lower side of the interior of the movable base 28.

[0032] Limit switches 482 are fixedly connected to the opposite sides of the front and rear corresponding partitions 481. Multiple warning lights 483 are fixedly connected to the upper side of the cover plate 41. The warning lights 483 are located above the two corresponding partitions 481.

[0033] By adopting the above technical solution, during the foam cutting process, multiple partitions 481 fixed on the lower side of the moving seat 28 divide the internal space of the moving seat 28 into multiple independent areas. Limit switches 482 set on the opposite sides of the front and rear partitions 481 constantly sense the movement status of the foam. When the foam moves smoothly in the guide groove 3, it will always be in contact with the limit switches 482. If the foam becomes too tightly wrapped or blocked during the movement, the limit switches 482 will be triggered by excessive compression. At this time, the limit switches 482 send a signal to the control box 13, and then the control box 13 will control the warning light 48 at the corresponding position on the upper side of the cover plate 41. When the warning light 483 illuminates, the operator can quickly determine the specific location of the foam abnormality based on the illuminated position and number of lights. If the side of the foam is uneven due to the abnormality of the cutting part 12, the limit switch 482 will also cause the warning light 483 to illuminate due to abnormal contact with the foam. Since the cut foam can be separated by the partition 481, and the limit switch 482 set on the side of the partition 481 can monitor the status of the foam in real time, when the foam is abnormal during the movement, the warning light 483 in the corresponding area will light up, so as to accurately find the abnormal foam and further ensure the initial connection efficiency of the foam.

[0034] like Figure 1 Figure 5 As shown, a cleaning assembly 49 is provided on the upper side of the horizontal part of the movable seat 28 and on the inner and outer sides of the cover plate 41. The cleaning assembly 49 includes a hollow cavity 491 opened inside the cover plate 41.

[0035] A pressure booster 492 is fixedly connected to the upper side of the cover plate 41, and a conduit 493 is fixedly connected to the back side of the pressure booster 492. The other end of the conduit 493 is connected to an external air supply device. A connecting pipe 494 is fixedly connected through a rectangular array arranged inside the lower side of the hollow cavity 491.

[0036] Limiting strips 495 are fixedly connected to the opposite surfaces of adjacent partitions 481. The limiting strips 495 are in the shape of an "L". Connecting pipes 494 in the same row pass through the horizontal part of the limiting strips 495. The lower side of the vertical part of the limiting strips 495 is flush with the upper side of the inside of the guide groove 3.

[0037] By adopting the above technical solution, when the slit foam passes through the cover plate 41, the external air supply device delivers gas through the conduit 493 to the pressurizing component 492 fixed on the upper side of the cover plate 41. After the pressurizing component 492 adjusts the pressure of the gas, it sends it into the hollow cavity 491 opened inside the cover plate 41. Then the gas is evenly sprayed to the edge of the foam being slit through multiple connecting pipes 494. At the same time, the limiting strip 495 can guide the gas to be accurately blown to the edge of the foam being slit. Since the porous nature of foam makes it easy to adsorb debris, the multiple connecting pipes 494 can evenly deliver the pressurized gas to the edge of the foam being slit. On the one hand, the high-pressure airflow can quickly clean the dust adsorbed on the cut surface and surface of the foam. On the other hand, the high-pressure airflow can also inhibit the adsorption of debris on the cut surface and surface of the foam.

[0038] Working principle: First, the foam roll is placed on the feeding roller 11 on the upper left side of the machine body 1. After the foam is drawn out from the feeding roller 11, it will be cut by the slitting component 12. The cut foam enters the upper part of the moving seat 28 and enters the through groove 22 opened on the surface of the receiving roller 21 after passing through the guide groove 3. During this process, the detection component 48 monitors the status of the foam in real time. Once the foam has an abnormality, it will immediately issue an alarm through the warning light 483 to remind the operator to deal with it. At the same time, the cleaning component 49 continues to work to clean the cut surface and surface of the foam. The attached debris is cleaned up, and the movable seat 28, pushed by the electric push rod 47, slides in the slide groove 45 inside the machine body 1 through the slider 44. When the movable seat 28 approaches the take-up roller 21, the locking component 2 is activated. At this time, the push bar 26 locks the foam inside the through groove 22. When the take-up roller 21 rotates, the initial connection is completed. At the same time, the pressure sensor 46 fixed inside the slide groove 45 can sense the movement position of the slider 44. When the slider 44 moves to the right and makes contact with the left side of the pressure sensor 46, it indicates that the movable seat 28 has reached the predetermined position.

[0039] The above description is merely a preferred embodiment of the present invention; however, 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 its improved concepts, should be covered within the scope of protection of the present invention.

Claims

1. A continuous slitting device for foam production, comprising a machine body (1) and a feeding roller (11) disposed on the upper left side of the machine body (1), characterized in that: The upper side of the body (1) is provided with a locking component (2); The locking component (2) includes a receiving roller (21) located on the upper right side of the machine body (1). The outer surface of the receiving roller (21) is provided with multiple through grooves (22). The lower inner side of the receiving roller (21) is provided with a first moving groove (23). The upper inner side of the first moving groove (23) is provided with a second moving groove (24). A push bar (26) is slidably connected inside the first moving groove (23). An extrusion bar (25) is slidably connected inside the second moving groove (24). The inclined surface of the push bar (26) and the inclined surface of the extrusion bar (25) are in sliding extrusion contact. A first magnetic block (27) is fixedly connected to both the front and rear sides of the left end of the push bar (26). Multiple tension springs (261) are fixedly connected between the left inner side of the first moving groove (23) and the left side of the push bar (26). A moving seat (28) is slidably connected to the lower inner side of the machine body (1). A second magnetic block (29) is fixedly connected to both the front and rear sides of the right vertical part of the moving seat (28).

2. The continuous slitting device for foam production according to claim 1, characterized in that: A slitting piece (12) is provided at the upper center of the machine body (1). A control box (13) is fixedly connected to the front side of the machine body (1). The first moving groove (23) is connected to the through groove (22) through the second moving groove (24). The first magnetic block (27) and the second magnetic block (29) are magnetically repelled. The right side of the moving seat (28) is arc-shaped. The shape of the right side of the moving seat (28) is adapted to the shape of the receiving roller (21) receiving area.

3. The continuous slitting device for foam production according to claim 1, characterized in that: Multiple guide grooves (3) are provided through the right side of the movable seat (28). The height of the left and right adjacent guide grooves (3) is adapted to the height of the through groove (22). The left and right adjacent guide grooves (3) and the through groove (22) are on the same horizontal line.

4. The continuous slitting device for foam production according to claim 1, characterized in that: The inner and outer sides of the machine body (1) are provided with a material fixing component (4), which includes a cover plate (41) fixedly connected to the upper side of the movable seat (28).

5. The continuous slitting device for foam production according to claim 4, characterized in that: A glass plate (42) is fixedly connected between the right side of the cover plate (41) and the left side of the vertical part of the movable seat (28). Fixing blocks (43) are fixedly connected to the front and rear sides of the upper end of the cover plate (41). Slider (44) is fixedly connected to the front and rear sides of the movable seat (28). Slide grooves (45) are opened on the front and rear sides inside the body (1). The slider (44) is slidably connected inside the slide groove (45). A pressure sensor (46) is fixedly connected to the right side inside the slide groove (45). After the right side of the slider (44) moves, it presses against the left side of the pressure sensor (46). Electric push rods (47) are fixedly connected to the front and rear sides of the upper end of the body (1). The telescopic end of the electric push rod (47) is fixedly connected to the left side of the fixing block (43).

6. The continuous slitting device for foam production according to claim 5, characterized in that: The inner and outer sides of the movable seat (28) are provided with a detection component (48), which includes multiple partitions (481) fixedly connected to the lower side inside the movable seat (28).

7. The continuous slitting device for foam production according to claim 6, characterized in that: Limit switches (482) are fixedly connected to the opposite surfaces of the front and rear partitions (481), and multiple warning lights (483) are fixedly connected to the upper side of the cover plate (41). The warning lights (483) are located above the two front and rear partitions (481).

8. A continuous slitting device for foam production according to claim 7, characterized in that: The upper side of the horizontal part of the movable seat (28) and the inner and outer sides of the cover plate (41) are provided with a cleaning component (49), the cleaning component (49) including a hollow cavity (491) opened inside the cover plate (41).

9. A continuous slitting device for foam production according to claim 8, characterized in that: A pressure booster (492) is fixedly connected to the upper side of the cover plate (41), and a conduit (493) is fixedly connected to the back side of the pressure booster (492). The other end of the conduit (493) is connected to an external air supply device. A connecting pipe (494) is fixedly connected through the lower side of the hollow cavity (491) in a rectangular array.

10. A continuous slitting device for foam production according to claim 9, characterized in that: Limiting strips (495) are fixedly connected to the opposite surfaces of the front and rear adjacent partitions (481). The limiting strips (495) are in the shape of an "L". The connecting pipes (494) in the same row pass through the horizontal part of the limiting strips (495). The lower side of the vertical part of the limiting strips (495) is flush with the upper side of the inside of the guide groove (3).

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