Plastic label film laminating device

Abstract

The invention relates to the technical field of label laminating, in particular to a plastic label film laminating device which comprises a conveying belt and a mounting support arranged on the conveying belt, a telescopic air cylinder is fixedly connected to the mounting support, the plastic label film laminating device further comprises a supporting frame arranged at the extension end of the telescopic air cylinder, and an extrusion roller is arranged on the supporting frame; the telescopic air cylinder is started to drive the supporting frame to move, so that the extrusion roller extends out to fold the label; the guide rod is arranged on the supporting frame, and the extrusion roller is in sliding connection with the guide rod; the telescopic air cylinder is started, and in the process of driving the extrusion roller to stretch out and fold the label, the linkage assembly is used for driving the extrusion roller to move along with the label, so that friction between the extrusion roller and the label in the moving direction of the conveying belt is avoided, and perfect label attachment is guaranteed; meanwhile, after the extrusion roller is folded and attached to the label, the overturning assembly is used for driving the extrusion roller to be separated from the label, and therefore when the extrusion roller is reset, additional friction or damage to the label is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of label laminating, in particular to a plastic label film laminating device. Background Art

[0002] Plastic label films are usually made of plastic, which is usually more resistant to water, tearing and durability than paper labels. Therefore, plastic label molds are used when sealing some packages. When laminating the label, it is divided into two steps. First, half of the label is laminating to one side of the package, and then the other half of the label is folded and laminating to the other side of the package. However, when the existing laminating device is performing the second step, such as the attached Figure 1 As shown, when the label is folded and pasted by the squeezing roller, the package moves with the conveyor belt, and friction is generated between the label and the squeezing roller along the moving direction of the conveyor belt. When the conveyor belt moves faster, this friction may cause wrinkles on the label, affecting the aesthetics of the label. For this reason, we propose a plastic label film pasting device. Summary of the invention

[0003] A technical problem to be solved by the present application is: how to design a method to solve the problem of label wrinkles that may be caused by the existing laminating device during high-speed moving packaging.

[0004] In order to solve the above technical problems, the embodiment of the present application provides a plastic label film laminating device, including a conveyor belt and a mounting bracket arranged on the conveyor belt, the mounting bracket is fixedly connected to a telescopic cylinder, and also includes: A support frame is arranged on the extended end of the telescopic cylinder, and a squeezing roller is arranged on the support frame. The telescopic cylinder is started to drive the support frame to move so that the squeezing roller extends out to fold the label; A guide rod is arranged on the support frame, and the squeezing roller is slidably connected to the guide rod; The linkage assembly is arranged on the support frame, and the squeezing roller is connected with the telescopic cylinder through the linkage assembly. The squeezing roller extends along with the telescopic cylinder, and the linkage assembly is used to drive the squeezing roller to slide along the guide rod, so that the squeezing roller moves along with the label.

[0005] In some embodiments, the extended end of the telescopic cylinder is fixedly connected to a mounting plate, and the support frame is connected to the mounting plate; The linkage assembly includes a hollow shaft 1 sleeved on the guide rod, the squeezing roller is rotatably connected to the hollow shaft 1, and a mounting frame is provided on the mounting plate, one end of the support frame is fixedly connected to a rotating cylinder, the mounting frame is connected to the rotating cylinder, a sliding ring is slidably connected to the rotating cylinder, a connecting piece is provided between the sliding ring and the hollow shaft 1, and a reset spring 1 is sleeved on the rotating cylinder, the two ends of the reset spring 1 are respectively in contact with the mounting frame and the sliding ring, and the sliding ring is moved to drive the squeezing roller to slide along the guide rod, and at the same time, the reset spring 1 is contracted under force to provide it with self-restoring ability; The mounting frame is provided with a transmission member, and two ends of the transmission member are respectively connected with the telescopic cylinder and the sliding ring. When the telescopic cylinder is started, the sliding ring is driven to move by the transmission member.

[0006] In some embodiments, the transmission member includes a guide wheel rotatably connected to the mounting frame, and a pull rope is provided on the mounting frame. One end of the pull rope is connected to the sliding ring, and the other end passes around the guide wheel and is connected to the fixed end of the telescopic cylinder.

[0007] In some embodiments, a hollow shaft 2 is fixedly connected to the mounting frame, the rotating cylinder passes through the hollow shaft 2 and is rotatably connected thereto, a flipping assembly is provided on the mounting frame, the flipping assembly is connected to the rotating cylinder, and after the extrusion roller is moved to fold the label, the flipping assembly is used to drive the rotating cylinder to rotate, thereby driving the extrusion roller to detach from the label, so that the extrusion roller does not contact the label during the resetting process.

[0008] In some embodiments, the flipping assembly includes a torsion spring mounted on a rotating cylinder, two ends of the torsion spring are respectively fixed to a hollow shaft two and a support frame, a round rod is slidably connected in the sliding ring, a guide groove part is provided on the rotating cylinder, one end of the round rod is located in the guide groove part, a slide groove three is provided on the mounting frame, and a hollow column is fixedly connected to the sliding ring, one end of the hollow column slides through the slide groove three, one end of the round rod is located in the hollow column, the telescopic cylinder is retracted, and a reset spring one is used to reset it, driving the sliding ring to move, and the round rod is used to slide in the guide groove part to reset the deflection of the rotating cylinder, and at the same time, the torsion spring is twisted by force to provide it with self-recovery ability.

[0009] In some embodiments, the guide groove member includes a straight slide groove 1 opened on a rotating cylinder, and one end of the round rod is located in the straight slide groove 1 and can slide along the straight slide groove to move the squeezing roller to maintain contact with the label.

[0010] In some embodiments, a spiral groove is provided on the rotating cylinder, the spiral groove intersects and is connected with the top end of the straight slide groove 1, and the straight slide groove 1 is designed to have a depth greater than that of the spiral groove, and an arc-shaped transition groove is provided on the rotating cylinder, the spiral groove and the other end of the straight slide groove 1 are respectively connected with the two ends of the arc-shaped transition groove, and the bottom surfaces of the two ends of the arc-shaped transition groove intersect with the spiral groove and the straight slide groove 1 respectively; One end of the round rod is fixedly connected to a second reset spring, and one end of the second spring is fixed to the inner wall of the hollow column. The torsion spring is reset, driving the round rod to slide along the arc-shaped transition groove, and the support frame is deflected. At the same time, the inner wall of the arc-shaped transition groove is used to squeeze the round rod. At the same time, the second reset spring is compressed and contracted, and the rear sliding ring is reset, driving the cylinder to move along the spiral groove, so that the support frame is deflected and reset.

[0011] In some embodiments, the connecting member includes a shift plate fixedly connected to the hollow shaft, one end of the shift plate is fixedly connected to an arc plate, an annular groove is opened on the sliding ring, one end of the arc plate is located in the annular groove, and moving the sliding ring drives the hollow shaft to move.

[0012] In some embodiments, the mounting plate and the mounting frame are detachably connected, and one end of the pull rope is also detachably connected to the telescopic cylinder.

[0013] In some embodiments, one end of the hollow column passes through the slide slot three and is rotatably connected to a pulley, and one end of the pull rope passes around the pulley and is fixed to the mounting frame.

[0014] The present invention has at least the following beneficial effects: Start the telescopic cylinder, and in the process of driving the squeezing roller to extend and fold the label, use the linkage assembly to drive the squeezing roller to move with the label, so as to avoid friction between the two along the moving direction of the conveyor belt, thus ensuring the perfect label bonding; At the same time, after the squeezing roller folds and affixes the label, the flip assembly is used to drive the squeezing roller to separate from the label, so as to avoid additional friction or damage to the label when the squeezing roller is reset. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of an existing label film laminating device; Figure 2 This is a schematic diagram of the overall structure of Embodiment 1 of the present invention; Figure 3 For the present invention Figure 2 Schematic diagram of the local cross-section structure; Figure 4 For the present invention Figure 3 Schematic diagram of the structure of the middle A area; Figure 5 For the present invention Figure 3 Another structural diagram; Figure 6 For the present invention Figure 5 Schematic diagram of the local cross-section structure; Figure 7 For the present invention Figure 6 Schematic diagram of the local cross-section structure; Figure 8 For the present invention Figure 7 Schematic diagram of the local cross-section structure; Fig. 9 For the present invention Figure 8 Schematic diagram of the structure of the middle B area; Fig.10 This is a structural schematic diagram of Example 2 of the present invention.

[0016] In the figure: 1. conveyor belt; 11. mounting bracket; 12. telescopic cylinder; 2. support frame; 3. guide rod; 4. linkage assembly; 5. extrusion roller; 41. mounting plate; 42. hollow shaft one; 43. mounting frame; 44. rotating cylinder; 45. sliding ring; 46. connecting piece; 47. reset spring one; 48. transmission piece; 49. guide wheel; 51. pull rope; 52. hollow shaft two; 53. flip assembly; 54. torsion spring; 55. round rod; 56. guide groove piece; 57. slide groove three; 58. hollow column; 59. straight slide groove one; 61. spiral groove; 62. arc transition groove; 63. reset spring two; 64. dial plate; 65. arc plate; 66. annular groove; 67. pulley. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] Example 1: Please refer to Figure 1-Figure 9 The present invention provides a technical solution: a plastic label film laminating device, comprising a conveyor belt 1 and a mounting bracket 11 mounted on the conveyor belt 1, a telescopic cylinder 12 is fixedly connected to the mounting bracket 11, and also includes: The support frame 2 is arranged on the extended end of the telescopic cylinder 12, and a squeezing roller 5 is arranged on the support frame 2. The telescopic cylinder 12 is started to drive the support frame 2 to move so that the squeezing roller 5 extends out to fold the label; A guide rod 3 is arranged on the support frame 2, and a squeezing roller 5 is slidably connected to the guide rod 3; The linkage assembly 4 is arranged on the support frame 2, and the squeezing roller 5 is connected to the telescopic cylinder 12 through the linkage assembly 4. The squeezing roller 5 follows the telescopic cylinder 12 to extend, and the linkage assembly 4 is used to drive the squeezing roller 5 to slide along the guide rod 3, so that the squeezing roller 5 follows the movement of the label; During specific operation, the telescopic cylinder 12 is started, and in the process of driving the squeezing roller 5 to extend and fold the label, the linkage assembly 4 is used to drive the squeezing roller 5 to move along with the label, thereby avoiding friction between the two along the moving direction of the conveyor belt 1, thereby ensuring perfect label lamination; At the same time, after the squeezing roller 5 is folded and affixed to the label, the flip assembly 53 is used to drive the squeezing roller 5 to separate from the label, so as to avoid additional friction or damage to the label when the squeezing roller 5 is reset.

[0019] The extended end of the telescopic cylinder 12 is fixedly connected to a mounting plate 41, and the support frame 2 is connected to the mounting plate 41; The linkage assembly 4 includes a hollow shaft 42 sleeved on the guide rod 3, the hollow shaft is slidably connected to the guide rod 3, the squeezing roller 5 is rotatably connected to the hollow shaft 42 through a bearing, and a mounting frame 43 is provided on the mounting plate 41, a rotating cylinder 44 is fixedly connected to one end of the support frame 2, the mounting frame 43 is connected to the rotating cylinder 44, a sliding ring 45 is slidably connected to the rotating cylinder 44, a connecting piece 46 is provided between the sliding ring 45 and the hollow shaft 42, and a reset spring 47 is sleeved on the rotating cylinder 44, and the two ends of the reset spring 47 are respectively in contact with the mounting frame 43 and the sliding ring 45 to resist each other, and the mobile sliding ring 45 drives the squeezing roller 5 to slide along the guide rod 3 by using the connecting piece 46, and the reset spring 47 is contracted under force to provide it with self-restoring ability; A transmission member 48 is disposed on the mounting frame 43 , and two ends of the transmission member 48 are respectively connected to the telescopic cylinder 12 and the sliding ring 45 . When the telescopic cylinder 12 is started, the sliding ring 45 is driven to move by the transmission member 48 .

[0020] The transmission member 48 includes a guide wheel 49 rotatably connected to the mounting frame 43 via a rotating shaft. A pull rope 51 is provided on the mounting frame 43. One end of the pull rope 51 is connected to the sliding ring 45, and the other end passes around the guide wheel 49 and is connected to the fixed end of the telescopic cylinder 12. The telescopic cylinder 12 is started to drive the squeezing roller 5 to move, and at the same time, the pull rope 51 is used to pull the sliding ring 45 to slide along the rotating cylinder 44.

[0021] A second hollow shaft 52 is fixedly connected to the mounting frame 43, and a rotating cylinder 44 passes through the second hollow shaft 52 and is rotatably connected thereto. A flip assembly 53 is provided on the mounting frame 43, and the flip assembly 53 is connected to the rotating cylinder 44. After the squeezing roller 5 is moved to fold the label, the flip assembly 53 is used to drive the rotating cylinder 44 to rotate, thereby driving the squeezing roller 5 to separate from the label, so that the squeezing roller 5 does not contact the label during the resetting process, thereby avoiding additional friction or damage to the label when the squeezing roller 5 is reset.

[0022] The flip assembly 53 includes a torsion spring 54 sleeved on the rotating cylinder 44, and the two ends of the torsion spring 54 are fixedly connected to the hollow shaft 2 52 and the support frame 2 respectively. A round rod 55 is slidably connected in the sliding ring 45, and a guide groove part 56 is provided on the rotating cylinder 44. One end of the round rod 55 is located in the guide groove part 56. A slide groove three 57 is provided on the mounting frame 43, and a hollow column 58 is fixedly connected to the sliding ring 45. One end of the hollow column 58 slides through the slide groove three 57. One end of the round rod 55 is located in the hollow column 58 and is slidably connected to the inner wall of the hollow column 58. The telescopic cylinder 12 is retracted to drive the extrusion roller 5 to move and retract, and the pull rope 51 is released at the same time. At this time, the reset spring 1 47 is used to reset and push the sliding ring 45 to move, and then the round rod 55 slides in the guide groove part 56, so that the rotating cylinder 44 deflects and resets. At the same time, the torsion spring 54 is twisted by force to provide it with self-recovery ability.

[0023] The guide groove member 56 includes a straight groove 59 provided on the rotating cylinder 44. One end of the round rod 55 is located in the straight groove 59 and can slide along it to move the squeezing roller 5 to maintain contact with the label. Specifically, one end of the round rod 55 is located in the straight groove 59 and is slidably connected to its inner wall. At this time, the reset spring 63 is in the initial state, and the squeezing roller 5 is also in the initial state. The telescopic cylinder 12 is started to drive the squeezing roller 5 to move and fold the label. At the same time, the round rod 55 slides along the straight groove 59 to maintain the stable state of the squeezing roller 5.

[0024] A spiral groove 61 is provided on the rotating cylinder 44, and the spiral groove 61 intersects and is connected with the top of the straight slide groove 59, and the straight slide groove 59 is designed to have a depth greater than the spiral groove 61. At this time, a step is formed at the intersection of the spiral groove 61 and the straight slide groove 59. An arc transition groove 62 is provided on the rotating cylinder 44, and the other end of the spiral groove 61 and the straight slide groove 59 are respectively connected with the two ends of the arc transition groove 62, and the bottom surfaces of the two ends of the arc transition groove 62 intersect with the spiral groove 61 and the straight slide groove 59 respectively. A return spring 2 63 is fixedly connected to one end of the round rod 55, and one end of the spring 2 is fixedly connected to the inner wall of the hollow column 58. When the extrusion roller 5 extends to fold the label to the bottom, the round rod 5 5 moves into the arc transition groove 62, at which time the torsion spring 54 is reset, driving the round rod 55 to slide along the arc transition groove 62, and at the same time the support frame 2 is deflected, driving the squeezing roller 5 to tilt away from the label, and at the same time the inner wall of the arc transition groove 62 is used to squeeze the round rod 55, so that the reset spring 2 63 is compressed and contracted, and then the telescopic cylinder 12 is reset, and the reset spring 1 47 is used to drive the sliding ring 45 to move and reset, and then drive the cylinder to move along the spiral groove 61, thereby driving the rotating cylinder 44 to rotate, and at the same time the torsion spring 54 is twisted and stored again, and at the same time when the cylinder passes over the step between the spiral groove 61 and the straight slide groove 1 59, the reset spring 2 63 is used to reset and drive the round rod 55 to extend and completely fit the straight slide groove 1 59.

[0025] The connecting member 46 includes a shift plate 64 fixedly connected to the hollow shaft 42, one end of the shift plate 64 is fixedly connected to an arc plate 65, an annular groove 66 is provided on the sliding ring 45, one end of the arc plate 65 is located in the annular groove 66 and is slidably connected to its inner wall, and the moving sliding ring 45 drives the hollow shaft 42 to move.

[0026] The mounting plate 41 and the mounting frame 43 are detachably connected, and one end of the pull rope 51 is also detachably connected to the telescopic cylinder 12, so that the device body can be disassembled from the telescopic cylinder 12, thereby improving its flexibility.

[0027] Example 2: Please refer to Figure 1-Figure 10 , the present invention provides a technical solution: a plastic label film laminating device, embodiment 2 is optimized on the basis of embodiment 1; One end of the hollow column 58 slides through the slide groove 57 and is rotatably connected to the pulley 67 through the bearing. One end of the pull rope 51 passes around the pulley 67 and is fixedly connected to the mounting frame 43. With this design, when the telescopic cylinder 12 is working, it can drive the extrusion roller 5 to follow the movement of the label at a speed lower than that of the telescopic cylinder 12, thereby increasing the design speed of the telescopic cylinder 12 and improving work efficiency.

[0028] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A plastic label film laminating device, comprising a conveyor belt (1) and a mounting bracket (11) arranged on the conveyor belt (1), wherein a telescopic cylinder (12) is fixedly connected to the mounting bracket (11), characterized in that: Also included are: A support frame (2) is arranged on the extended end of the telescopic cylinder (12), and a squeezing roller (5) is arranged on the support frame (2). The telescopic cylinder (12) is started to drive the support frame (2) to move, so that the squeezing roller (5) extends out of the folding label; A guide rod (3) is arranged on the support frame (2), and the squeezing roller (5) is slidably connected to the guide rod (3); The linkage assembly (4) is arranged on the support frame (2), and the squeezing roller (5) is connected to the telescopic cylinder (12) through the linkage assembly (4). The squeezing roller (5) extends along with the telescopic cylinder (12), and the linkage assembly (4) drives the squeezing roller (5) to slide along the guide rod (3), so that the squeezing roller (5) moves along with the label.

2. The plastic label film laminating device according to claim 1, characterized in that: The extended end of the telescopic cylinder (12) is fixedly connected to a mounting plate (41), and the support frame (2) is connected to the mounting plate (41); The linkage assembly (4) comprises a hollow shaft (42) sleeved on the guide rod (3), the squeezing roller (5) is rotatably connected to the hollow shaft (42), and a mounting frame (43) is provided on the mounting plate (41), one end of the support frame (2) is fixedly connected to a rotating cylinder (44), the mounting frame (43) is connected to the rotating cylinder (44), a sliding ring (45) is slidably connected to the rotating cylinder (44), a connecting member (46) is provided between the sliding ring (45) and the hollow shaft (42), and a return spring (47) is sleeved on the rotating cylinder (44), the two ends of the return spring (47) are respectively in contact with the mounting frame (43) and the sliding ring (45) to resist each other, and the sliding ring (45) is moved to drive the squeezing roller (5) to slide along the guide rod (3), and at the same time, the return spring (47) is contracted under force to provide it with self-restoring ability; A transmission member (48) is provided on the mounting frame (43), and two ends of the transmission member (48) are respectively connected to the telescopic cylinder (12) and the sliding ring (45). When the telescopic cylinder (12) is started, the sliding ring (45) is driven to move by the transmission member (48).

3. The plastic label film laminating device according to claim 2, characterized in that: The transmission member (48) comprises a guide wheel (49) rotatably connected to the mounting frame (43); a pull rope (51) is provided on the mounting frame (43); one end of the pull rope (51) is connected to the sliding ring (45); the other end of the pull rope (51) passes around the guide wheel (49) and is connected to the fixed end of the telescopic cylinder (12).

4. The plastic label film laminating device according to claim 3, characterized in that: The mounting frame (43) is fixedly connected to a second hollow shaft (52); the rotating cylinder (44) passes through the second hollow shaft (52) and is rotatably connected thereto; a flip assembly (53) is provided on the mounting frame (43); the flip assembly (53) is connected to the rotating cylinder (44); after the squeezing roller (5) is moved to fold the label, the flip assembly (53) is used to drive the rotating cylinder (44) to rotate, thereby driving the squeezing roller (5) to separate from the label, so that the squeezing roller (5) does not contact the label during the resetting process.

5. The plastic label film laminating device according to claim 4, characterized in that: The flip assembly (53) comprises a torsion spring (54) sleeved on a rotating cylinder (44), the two ends of the torsion spring (54) being respectively fixed to the second hollow shaft (52) and the support frame (2), a round rod (55) being slidably connected in the sliding ring (45), a guide groove (56) being provided on the rotating cylinder (44), one end of the round rod (55) being located in the guide groove (56), a sliding groove (57) being provided on the mounting frame (43), and the sliding ring (45 ) is fixedly connected to a hollow column (58), one end of the hollow column (58) slides through the slide groove three (57), one end of the round rod (55) is located in the hollow column (58), the telescopic cylinder (12) is retracted, and the return spring one (47) is used to reset, drive the sliding ring (45) to move, and use the round rod (55) to slide in the guide groove member (56) to deflect and reset the rotating cylinder (44), and at the same time, the torsion spring (54) is twisted by force to provide it with self-restoring ability.

6. The plastic label film laminating device according to claim 5, characterized in that: The guide groove member (56) comprises a straight slide groove (59) formed on the rotating cylinder (44); one end of the round rod (55) is located in the straight slide groove (59) and can slide along the straight slide groove to move the squeezing roller (5) to maintain contact with the label.

7. The plastic label film laminating device according to claim 6, characterized in that: The rotating cylinder (44) is provided with a spiral groove (61), the spiral groove (61) intersects and is connected with the top end of the straight slide groove (59), and the straight slide groove (59) is designed to have a depth greater than that of the spiral groove (61). The rotating cylinder (44) is provided with an arc-shaped transition groove (62), the spiral groove (61) and the other end of the straight slide groove (59) are respectively connected with the two ends of the arc-shaped transition groove (62), and the bottom surfaces of the two ends of the arc-shaped transition groove (62) intersect with the spiral groove (61) and the straight slide groove (59) respectively; One end of the round rod (55) is fixedly connected to a second return spring (63), one end of which is fixed to the inner wall of the hollow column (58). The torsion spring (54) is reset, driving the round rod (55) to slide along the arc-shaped transition groove (62), and the support frame (2) is deflected. At the same time, the inner wall of the arc-shaped transition groove (62) is used to squeeze the round rod (55). At the same time, the second return spring (63) is compressed and contracted, and the rear sliding ring (45) is reset, driving the column to move along the spiral groove (61), so that the support frame (2) is deflected and reset.

8. The plastic label film laminating device according to claim 7, characterized in that: The connecting member (46) comprises a shifting plate (64) fixedly connected to the hollow shaft (42); one end of the shifting plate (64) is fixedly connected to an arc plate (65); an annular groove (66) is formed on the sliding ring (45); one end of the arc plate (65) is located in the annular groove (66); moving the sliding ring (45) drives the hollow shaft (42) to move.

9. The plastic label film laminating device according to claim 8, characterized in that: The mounting plate (41) and the mounting frame (43) are detachably connected, and one end of the pull rope (51) is also detachably connected to the telescopic cylinder (12).

10. The plastic label film laminating device according to claim 9, characterized in that: One end of the hollow column (58) passes through the third slide groove (57) and is rotatably connected to a pulley (67), and one end of the pull rope (51) passes around the pulley (67) and is fixed to the mounting frame (43).

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