Swing arm transfer module

Abstract

The utility model belongs to the technical field of hosiery machines, and particularly relates to a swing arm transfer module which solves the problem that a single-shaft structure unstably controls lifting and swinging of a swing arm. The swing arm transfer module comprises a base and a stand column, a stand column rotation driving mechanism is arranged between the base and the stand column, the stand column is sleeved with a lifting sleeve, a threaded screw lifting mechanism is arranged between the lifting sleeve and the stand column, a guide seat located on one side is fixed to the stand column, and a lifting guide rod parallel to the stand column is arranged in a guide hole of the guide seat in a penetrating mode. The lifting guide rod is fixedly connected with the lifting sleeve, the lifting sleeve is sleeved with a lower swing arm and an upper swing arm, the lower swing arm is fixedly connected with the lifting sleeve, the upper swing arm is movably connected with the lifting sleeve, a clutch assembly is arranged between the upper swing arm and the lower swing arm, and an upper swing arm lifting mechanism is arranged between the upper swing arm and the lifting guide rod. An upper swing arm linkage rotation reset mechanism is arranged between the upper swing arm lifting mechanism and the upper swing arm. The double-shaft structure improves the stability of lifting and rotating control of the swing arm, and is convenient to assemble and maintain.

Description

TECHNICAL FIELD

[0001] The utility model belongs to hosiery technical field, especially related to a swing arm transfer module. BACKGROUND

[0002] Hosiery as the important equipment in the textile industry, one of its core functions is to realize the automatic knitting and transfer of socks. In the production process of hosiery, swing arm transfer device is a key component, which is used to transfer the knitted socks from the knitting station to the subsequent processing station.

[0003] In the prior art, most swing arm transfer devices set the upper swing arm and the lower swing arm on the stand, the structure for controlling the synchronous lifting or rotation of the upper and lower swing arms, and the structure for controlling the rotation or lifting of the upper swing arm relative to the lower swing arm are all set on the stand, that is, the relevant swing lifting function is realized by a single shaft and the structure thereon. Such an integrated structure is complex, inconvenient for early assembly and later maintenance, and may have the problem of poor stability in lifting and swing transmission. UTILITY MODEL CONTENTS

[0004] The utility model aims at the above problems existing in the prior art and provides a swing arm transfer module.

[0005] To achieve the purpose of the utility model, the following technical solutions can be used:

[0006] A swing arm transfer module, comprising a base and a stand, a stand rotation driving mechanism is arranged between the base and the stand, a lifting sleeve is sleeved on the stand, a threaded screw lifting mechanism is arranged between the lifting sleeve and the stand, a guide seat is fixed on one side of the stand, a lifting guide rod parallel to the stand is arranged in the guide hole of the guide seat, the lifting guide rod is fixedly connected with the lifting sleeve, a lower swing arm and an upper swing arm are sleeved on the lifting sleeve, the lower swing arm is fixedly connected with the lifting sleeve, and the upper swing arm is movably connected with the lifting sleeve, a clutch assembly is arranged between the upper swing arm and the lower swing arm, an upper swing arm lifting mechanism is arranged between the upper swing arm and the lifting guide rod, and an upper swing arm linkage rotation reset mechanism capable of driving the upper swing arm to move axially and rotate and reset is arranged between the upper swing arm lifting mechanism and the upper swing arm.

[0007] The utility model discloses a main part is by base, stand and the upper swing arm and lower swing arm of setting on the stand through the lifting cover composition, and the stand rotary drive mechanism is used for driving the rotation of stand, realizes the integral swing control of upper swing arm and lower swing arm, and the screw rod lifting mechanism is used for controlling the lifting action of lifting cover, realizes the integral lifting control of upper swing arm and lower swing arm. Especially, the lifting guide rod is arranged in the side of the stand, and the lifting guide rod is fixed with the lifting cover, can synchronous lifting action with the lifting cover, and the upper swing arm lifting mechanism on the lifting guide rod is used for providing the driving force of the lifting action of upper swing arm relative to lower swing arm, and the lifting control of upper swing arm is more stable, and it is convenient to process and maintain, and the upper swing arm linkage rotary reset mechanism is connected with the upper swing arm and the upper swing arm lifting mechanism, realizes the lifting driving force transmission between to control the lifting action of upper swing arm, when the upper swing arm and lower swing arm are in the same swing direction and vertical close, and the clutch assembly forms the relative rotation of upper swing arm and lower swing arm, when the upper swing arm is vertical and away from lower swing arm, the clutch assembly then removes the rotation limit of upper swing arm and lower swing arm, and the upper swing arm linkage rotary reset mechanism can drive the horizontal rotation of upper swing arm at this time, and the effect that the line disc of the front end of upper swing arm is away from the transfer disc of the front end of lower swing arm can be realized. The relevant structure setting of the installation, lifting control and rotation control of upper swing arm is on the stand and the lifting guide rod, and the parallel double shaft structure makes the control and transmission of upper swing arm more stable, and the space structure is balanced.

[0008] In the swing arm transfer module, the upper swing arm lifting mechanism includes an upper swing arm driving connector sleeved on the lifting guide rod, a lifting driving assembly is arranged between the upper swing arm driving connector and the lifting guide rod, the upper swing arm driving connector is connected with the upper swing arm, and an upper swing arm linkage rotary reset mechanism that can drive the upper swing arm to axially move and can make the upper swing arm to rotate reset is arranged between the upper swing arm driving connector and the upper swing arm linkage rotary reset mechanism.

[0009] The upper swing arm driving connector is sleeved on the lifting guide rod and can axially move up and down, the upper swing arm driving connector is connected with the upper swing arm and moves up and down synchronously, the lifting driving assembly is used for driving the upper swing arm driving connector to move up and down, thereby realizing the effect of controlling the upper swing arm to move up and down, the upper swing arm linkage rotary reset mechanism is used for the transmission connection of the upper swing arm driving connector and the upper swing arm, and the upper swing arm is also given a tendency to rotate away from the lower swing arm, so that the upper swing arm is rotated to reset when the clutch assembly is disengaged.

[0010] In the swing arm transfer module, the lifting driving assembly comprises a driving body axially movable arranged in a guide rod shaft hole of the lifting guide rod, a linear driving unit is arranged between the driving body and the lifting guide rod, N radial shafts are arranged on the driving body and distributed in the circumferential direction, N≥1, an axial strip hole is arranged on the lifting guide rod and can communicate with the outside in the radial direction and the number of the radial shafts, the radial shafts are arranged in the axial strip hole one by one, and the outer ends of the radial shafts are connected with the upper swing arm driving connector.

[0011] The lifting guide rod is internally provided with an axially extending guide rod shaft hole, the driving body is slidably arranged in the guide rod shaft hole, the radial shafts on the driving body are connected with the upper swing arm driving connector through the axial strip hole, the axial strip hole vertically extends and is adapted to the lifting of the upper swing arm driving connector, simultaneously limits the circumferential rotation of the driving body, and the linear driving unit is used for providing the driving force for lifting the driving body. Further, a wear-resistant guide sleeve is arranged between the upper swing arm driving connector and the lifting guide rod, so as to ensure the stable lifting of the upper swing arm driving connector on the lifting guide rod and increase the wear resistance.

[0012] In the swing arm transfer module, the upper swing arm linkage rotary reset mechanism comprises an annular groove arranged on the upper swing arm and coaxially arranged with the stand, at least two first rolling bodies are arranged in the annular groove and uniformly distributed in the circumferential direction and can slide in the annular groove, the first rolling bodies are connected with the upper swing arm driving connector through rolling body seats, and the lifting guide rod and the lifting sleeve are further provided with an upper swing arm rotary reset assembly. The rotary reset assembly comprises a spring support arranged on the upper swing arm driving connector and located between the lifting guide rod and the lifting sleeve, and a rotary reset spring is arranged between the spring support and the annular groove.

[0013] The first rolling bodies on the upper swing arm driving connector are limited in the annular groove, the upper swing arm can rotate relative to the upper swing arm driving connector, but is lifted synchronously, of course, the sliding contact between the first rolling bodies and the annular groove can also be rolling contact, so as to reduce the wear and the rotation resistance. The upper swing arm rotary reset assembly is used for specifically providing the driving force required for the rotary reset of the upper swing arm, one end of the rotary reset spring is connected with the upper swing arm, the other end is connected with the upper swing arm driving connector through the spring support, a coaxial spring groove is arranged below the annular groove, the main body segment of the rotary reset spring is wound in the spring groove, and the upper swing arm can be pulled to rotate away from the lower swing arm.

[0014] Specifically, the spring support is L-shaped, the horizontal segment of the spring support can be detachably fixed to one side of the upper swing arm driving connector away from the winding part of the rotary reset spring, a fixing column is arranged in the spring groove, and the two ends of the rotary reset spring are connected with the fixing column and the vertical segment of the spring support respectively.

[0015] In the swing arm transfer module, the rolling body seat is in an arc shape and partially embraces the annular groove, the first rolling body is in sliding connection with the two side walls of the annular groove, and the diameter of the first rolling body is adapted to the width of the annular groove. At least one second rolling body is in sliding contact with the bottom of the annular groove.

[0016] The first rolling body is arranged in the radial direction of the annular groove and is detachably arranged on the inner side wall of the rolling body seat through a connecting shaft. The upper and lower sides of the first rolling body are in sliding connection with the two side walls of the annular groove, which ensures the stability of the lifting control and avoids vertical jumping. The axial direction of the second rolling body is parallel to the axial direction of the annular groove. Rolling body arrangement holes are arranged in the side of the rolling body seat. The second rolling body is rotatably connected to the rolling body arrangement holes through a connecting shaft. The circumferential surface of the second rolling body is in contact with the bottom of the annular groove, which ensures the smooth rotation of the annular groove relative to the rolling body seat. Further, the first rolling body and the second rolling body can be cylindrical rollers or bearings, and the rolling is smooth.

[0017] In the swing arm transfer module, the linear drive unit includes a linear drive fixed to the top of the lifting guide rod, and the linear drive is connected to the driving body through a lifting drive shaft.

[0018] A first auxiliary lifting spring is arranged between the driving body and the bottom of the lifting guide rod. The lower end of the first auxiliary lifting spring abuts against a first plug at the lower end of the guide rod shaft hole, and the upper end abuts against the driving body.

[0019] The two ends of the lifting drive shaft are detachably connected to the output end of the linear drive and the top of the driving body, respectively, which is equivalent to extending the output shaft of the linear drive. The first auxiliary lifting spring provides an elastic upward thrust to the driving body, reduces the load of the linear drive, and reduces the driving force cost. The guide rod shaft hole of the lifting guide rod is axially through, and the lower end opening is detachably closed by the first plug to avoid the entry of sundries and facilitate the disassembly and maintenance of the first auxiliary lifting spring.

[0020] In the swing arm transfer module, the lifting guide rod is fixed to the lifting sleeve through the upper and lower connecting seats. The upper swing arm and the lower swing arm are located between the upper and lower connecting seats. The guide seat is located below the lower connecting seat.

[0021] A lifting rotary sleeve is arranged between the upper swing arm and the lifting sleeve. The upper swing arm is fixed to the lifting rotary sleeve, and an annular clearance is left between the lower swing arm and the lifting sleeve. The lower end of the lifting rotary sleeve is arranged in the annular clearance.

[0022] The lifting guide rod is fixed with the lifting sleeve through two connecting seats, the structure is stable, the lifting rotating sleeve is sleeved on the lifting sleeve in a lifting and rotating manner, the upper swing arm is arranged on the lifting rotating sleeve, wear of the mounting sleeve hole of the upper swing arm is avoided, a corresponding wear-resistant layer can also be arranged between the lifting sleeve and the lifting rotating sleeve, and the annular clearance is used for radial clearance of the lifting rotating sleeve.

[0023] Further, the guide seat is sleeved and fixed on the column through the annular mounting portion, the guide seat is further provided with a D-shaped guide ring, the guide ring comprises an arc portion and a strip portion which is detachably arranged at the opening of the arc portion, the guide hole is formed between the strip portion and the arc portion, the third rolling body is rotatably connected to the inner side of the strip portion and the inner side wall of the arc portion, and the third rolling body is rolling connected with the lifting guide rod and can rotate with the lifting guide rod.

[0024] The mounting portion is sleeved on the column and fixed on the flange portion thereof, the guide ring is D-shaped, the vertical end of the guide ring, i.e. the strip portion and the arc portion are detachably fixed, the lifting guide rod is convenient to disassemble and assemble, the axial direction of the third rolling body is perpendicular to the axial direction of the lifting guide rod, the circumferential surface of the third rolling body rolls on the lifting guide rod, the stable positioning of the lifting guide rod in the guide hole is ensured, and the resistance of the lifting guide rod relative to the column during the lifting operation is reduced.

[0025] In the swing arm transfer module, the column rotating drive mechanism comprises a first rotating drive arranged on the base, the column is rotatably connected to the column mounting hole of the base, and the lower end is provided with a worm wheel, and the output end of the first rotating drive is connected with the worm wheel through a worm.

[0026] The first rotating drive is arranged on the base through a motor base, the worm on the first rotating drive penetrates into the base and intersects with the column mounting hole, the lower part of the column is rotatably connected to the base, and the worm wheel is further arranged at the lower end of the column, the worm wheel is engaged with the worm, the first rotating drive drives the circumferential rotation of the column by driving the worm to rotate. The lower part of the column is rotatably connected to the column mounting hole through the upper rolling bearing and the lower rolling bearing.

[0027] As an optimization, the column is provided with an annular oil guide cover between the upper rolling bearing and the worm wheel, the oil guide cover comprises an oil guide slope with low outer side and high inner side, an oil passing gap is arranged between the oil guide slope and the inner side wall of the column mounting hole, and the oil passing gap is located above the engagement point of the worm wheel and the worm.

[0028] An oil guide cover is further arranged above the worm gear, which is annular and has a circumferential outer side lower than a circumferential inner side, and forms a downwardly inclined oil guide slope, which is not connected with the inner side wall of the column mounting hole in a radial outer side, and an oil passing gap is formed between the two, which allows oil to flow downward, and the meshing point of the worm and the worm gear is located below the oil passing gap, and the lubricating oil can be added from above the upper rolling bearing, and flows to the meshing point through the upper rolling bearing and the oil passing gap, to ensure smooth transmission.

[0029] In the swing arm transfer module, the threaded screw lifting mechanism comprises a nut arranged at the top of the column, a screw threadedly connected in the nut, an upper end of the screw connected with a second rotary driver, and the second rotary driver connected with the lifting sleeve through a driver seat.

[0030] The column is provided with an axially extending central hole, the nut is detachably fixed to the upper end of the central hole, the lower end of the screw extends into the central hole, and a second auxiliary lifting spring is arranged between the bottom of the central hole and the screw, the upper end of the second auxiliary lifting spring is connected with the bottom of the screw through a plane bearing, and the lower end abuts against a second plug at the lower end of the central hole.

[0031] The central hole axially penetrates the column, the nut is fixed to the upper end of the central hole, the screw is engaged with the screw on the lifting sleeve, and the second rotary driver drives the rotation of the screw to realize the effect of driving the lifting sleeve to ascend and descend relative to the column. The second auxiliary lifting spring applies an elastic upward thrust to the lifting sleeve to balance part of the gravity of the lifting sleeve and its upper components, thereby reducing the driving force cost. The lower end of the central hole is detachably closed by the second plug to avoid the entry of sundries and facilitate the disassembly and maintenance of the second auxiliary lifting spring.

[0032] In the swing arm transfer module, the clutch assembly comprises an anti-rotation column and an anti-rotation hole arranged on the upper swing arm and the lower swing arm respectively and extending axially, and the anti-rotation column can be inserted into the anti-rotation hole when the upper swing arm and the lower swing arm are at the same rotation angle and vertically close.

[0033] The distance between the anti-rotation column and the anti-rotation hole and the column axis is the same, the upper swing arm and the lower swing arm are located on the same vertical line when they are rotated to the same angle, the anti-rotation column is inserted into the anti-rotation hole as the upper swing arm and the lower swing arm are vertically close, the rotation is limited, and the outer diameter of the anti-rotation column and the inner diameter of the anti-rotation hole are adapted to each other.

[0034] The vertical strip-shaped hole of the sensor frame is detachably provided with a height sensing assembly located at the side of the lifting guide rod, the height sensing assembly comprises a first sensor located above the guide seat and a second sensor located below the guide seat, the first sensor is located at the side of the lifting path of the lower connecting seat, and the second sensor is located at the side of the bottom end of the lifting guide rod.

[0035] The first sensor and the second sensor can be laser sensors, and the specific structure and detection principle are well-known, and will not be described in detail.

[0036] The base is provided with a swing angle sensing assembly located below the guide seat, the swing angle sensing assembly comprises at least two third sensors distributed in the circumferential direction, the third sensors are detachably fixed to the side of the base through connecting sheets, and the guide seat rotates between the third sensors.

[0037] The swing angle sensing assembly is used for detecting the rotation angle of the stand, and is specifically realized through two vertically arranged third sensors, the third sensors are located below the guide seat and face the guide seat, the guide seat rotates between the third sensors along with the stand, and the third sensors detect whether the guide ring side passes to realize corresponding swing angle position judgment.

[0038] Compared with the prior art, the utility model mainly has the following advantages:

[0039] 1. The utility model discloses a lifting guide rod is arranged in the side of the stand, and the lifting guide rod is fixedly connected with the lifting sleeve and can synchronously lift with the lifting sleeve, the upper swing arm lifting mechanism on the lifting guide rod is used for providing the driving force of the relative lifting action of the upper swing arm and the lower swing arm, and the lifting control of the upper swing arm is more stable, and the upper swing arm linkage rotary reset mechanism is connected with the upper swing arm and the upper swing arm lifting mechanism, realizes the lifting driving force transmission between them to control the lifting action of the upper swing arm, when the clutch assembly removes the rotation limit of the upper swing arm and the lower swing arm, the upper swing arm linkage rotary reset mechanism can also drive the horizontal rotation of the upper swing arm.

[0040] 2. The driving body slides in the guide rod shaft hole, a radial shaft on the driving body is connected with the upper swing arm driving connector through an axial strip-shaped hole, the axial strip-shaped hole extends vertically and is adapted to the lifting of the upper swing arm driving connector, and simultaneously limits the circumferential rotation of the driving body.

[0041] 3. The first rolling body on the upper swing arm driving connector is limited in the annular groove, the upper swing arm is synchronous with the lifting of the upper swing arm driving connector but can rotate relatively, one end of the rotary return spring is connected with the upper swing arm, and the other end is connected with the upper swing arm driving connector through the spring support, and the main body segment of the rotary return spring is wound in the spring groove and can pull the upper swing arm to rotate away from the lower swing arm.

[0042] 4. The first rolling body is arranged in the radial direction of the annular groove, and the upper and lower sides thereof are connected with the two side walls of the annular groove in sliding connection, so as to ensure the stability of lifting control and simultaneously avoid vertical jumping. The axial direction of the second rolling body is parallel to the axial direction of the annular groove, and the circumferential surface thereof is connected with the groove bottom of the annular groove, so as to ensure the smooth rotation of the annular groove relative to the rolling body seat.

[0043] 5. The first auxiliary lifting spring provides an elastic upward thrust to the driving body, reduces the load of the linear driver, and reduces the driving force cost. The guide rod shaft hole of the lifting guide rod is axially penetrated, and the lower end opening thereof is closed by the first plug in a detachable manner, so as to avoid the addition of sundries and facilitate the disassembly and maintenance of the first auxiliary lifting spring. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 is a schematic diagram of the overall structure provided by the utility model;

[0045] Figure 2 is a schematic diagram of the front view provided by the utility model;

[0046] Figure 3 is Figure 2 is a sectional view of A-A in the figure;

[0047] Figure 4 is Figure 2 is a sectional view of B-B in the figure;

[0048] Figure 5 is a schematic diagram of the structure of the upper swing arm linkage rotary return mechanism provided by the utility model;

[0049] Figure 6 is a schematic diagram of the structure of the guide seat provided by the utility model;

[0050] Figure 7 is a schematic diagram of the structure of the upper connecting seat and the lower connecting seat provided by the utility model.

[0051] In the figure, 1 is the base, 2 is the column, 3 is the column rotation drive mechanism, 4 is the lifting sleeve, 5 is the threaded screw lifting mechanism, 6 is the guide seat, 7 is the guide hole, 8 is the lifting guide rod, 9 is the lower swing arm, 10 is the upper swing arm, 11 is the clutch assembly, 12 is the upper swing arm lifting mechanism, 13 is the upper swing arm linkage rotation reset mechanism, 14 is the upper swing arm drive connector, 15 is the lifting drive assembly, 16 is the guide rod shaft hole, 17 is the drive body, 18 is the linear drive unit, 19 is the radial shaft, 20 is the axial strip hole, 21 is the wear-resistant guide sleeve, 22 is the annular groove, 23 is the first rolling element, 24 is the rolling element seat, 25 is the spring bracket, 26 is the rotation reset spring, 27 is the second rolling element, 28 is the linear actuator, 29 is the lifting drive shaft, 30 is the first auxiliary lifting spring, 31 is the first plug, 32 is the upper connecting seat, 33 is the lower connecting seat, and so on. 34. Lowering rotating sleeve, 35. Annular clearance, 36. Mounting part, 37. Guide ring, 38. Arc-shaped part, 39. Strip-shaped part, 40. Third rolling element, 41. First rotating actuator, 42. Column mounting hole, 43. Worm gear, 44. Upper rolling bearing, 45. Lower rolling bearing, 46. Spring groove, 49. Nut, 50. Screw, 51. Second rotating actuator, 52. Actuator seat, 53. Rolling bearing, 54. Center hole, 55. Second auxiliary lifting spring, 56. Planar bearing, 57. Second plug, 58. Anti-rotation column, 59. Anti-rotation hole, 60. Sensor bracket, 61. Vertical strip hole, 62. Height sensing assembly, 63. First sensor, 64. Second sensor, 65. Swing angle sensing assembly, 66. Third sensor, 67. Connecting piece, 68. Upper swing arm rotation reset assembly, 69. Detailed Implementation

[0052] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0053] Specific implementation examples Figures 1-7 As shown, this swing arm transfer module includes a base 1 and a column 2. A column rotation drive mechanism 3 is provided between the base 1 and the column 2. A lifting sleeve 4 is fitted on the column 2. A threaded screw lifting mechanism 5 is provided between the lifting sleeve 4 and the column 2. A guide seat 6 located on one side is fixed on the column 2. A lifting guide rod 8 parallel to the column 2 is inserted into the guide hole 7 of the guide seat 6. The lifting guide rod 8 is fixedly connected to the lifting sleeve 4. A lower swing arm 9 and an upper swing arm 10 are fitted on the lifting sleeve 4. The lower swing arm 9 is fixedly connected to the lifting sleeve 4. The upper swing arm 10 is movably connected to the lifting sleeve 4. A clutch assembly 11 is provided between the upper swing arm 10 and the lower swing arm 9. An upper swing arm lifting mechanism 12 is provided between the upper swing arm 10 and the lifting guide rod 8. An upper swing arm linkage rotation reset mechanism 13 is provided between the upper swing arm lifting mechanism 12 and the upper swing arm 10, which can drive the upper swing arm 10 to move axially and can rotate it to reset.

[0054] Specifically, the column rotating driving mechanism 3 is used to drive the rotation of the column 2, to realize the overall swing control of the upper swing arm 10 and the lower swing arm 9, and the screw rod lifting mechanism 5 is used to control the lifting action of the lifting sleeve 4, to realize the overall lifting control of the upper swing arm 10 and the lower swing arm 9. In particular, the lifting guide rod 8 is arranged in parallel on the side of the column 2, the lifting guide rod 8 is fixedly connected with the lifting sleeve 4 and can synchronously lift with the lifting sleeve 4, the upper swing arm lifting mechanism 12 on the lifting guide rod 8 is used to provide the driving force for the lifting action of the upper swing arm 10 relative to the lower swing arm 9, so that the lifting control of the upper swing arm 10 is more stable, and the processing and maintenance are facilitated, the upper swing arm linkage rotating reset mechanism 13 connects the upper swing arm 10 and the upper swing arm lifting mechanism 12, to realize the lifting driving force transmission therebetween to control the lifting action of the upper swing arm 10, when the upper swing arm 10 and the lower swing arm 9 are in the same swing direction and vertically close to each other, the clutch assembly 11 forms the cooperation to limit the relative rotation of the upper swing arm 10 and the lower swing arm 9, when the upper swing arm 10 is vertically away from the lower swing arm 9, the clutch assembly 11 releases the rotation limiting of the upper swing arm 10 and the lower swing arm 9, at this time, the upper swing arm linkage rotating reset mechanism 13 can drive the horizontal rotation of the upper swing arm 10, so that the effect that the line pressing disc at the front end of the upper swing arm 10 is away from the transfer disc at the front end of the lower swing arm 9 can be realized. The relevant structure for the installation, lifting control and rotating control of the upper swing arm 10 is arranged on the column 2 and the lifting guide rod 8, and the parallel double-shaft structure makes the control and transmission of the upper swing arm 10 more stable, and the space structure is balanced.

[0055] As shown in Figure 1 , 2 , 3, 5, the upper swing arm lifting mechanism 12 comprises an upper swing arm driving connecting piece 14 sleeved on the lifting guide rod 8, a lifting driving assembly 15 is arranged between the upper swing arm driving connecting piece 14 and the lifting guide rod 8, the upper swing arm driving connecting piece 14 is connected with the upper swing arm 10, and the upper swing arm linkage rotating reset mechanism 13 capable of driving the axial movement of the upper swing arm 10 and enabling the rotating reset of the upper swing arm 10 is arranged between the upper swing arm driving connecting piece 14 and the upper swing arm linkage rotating reset mechanism 13. The lifting driving assembly 15 comprises a driving body 17 capable of axially moving and arranged in a guide rod shaft hole 16 of the lifting guide rod 8, a linear driving unit 18 is arranged between the driving body 17 and the lifting guide rod 8, two radial shafts 19 distributed in the circumferential direction are arranged on the driving body 17, the lifting guide rod 8 is provided with axial strip-shaped holes 20 capable of enabling the radial communication of the guide rod shaft hole 16 with the outside and equal in number to the radial shafts 19, the radial shafts 19 pass through the axial strip-shaped holes 20 and correspond one by one, and the outer ends of the radial shafts 19 are connected with the upper swing arm driving connecting piece 14.

[0056] Specifically, the upper swing arm drive connector 14 is sleeved on the lifting guide rod 8 and can move axially up and down. The upper swing arm drive connector 14 is connected to the upper swing arm 10 and moves up and down synchronously. The lifting drive assembly 15 is used to drive the upper swing arm drive connector 14 to move up and down, thereby achieving the effect of controlling the movement of the upper swing arm 10. The upper swing arm linkage rotation reset mechanism 13 is used for the transmission connection between the upper swing arm drive connector 14 and the upper swing arm 10, and also gives the upper swing arm 10 a tendency to rotate away from the lower swing arm 9, so as to reset the upper swing arm 10 when the clutch assembly 11 is disengaged. The lifting guide rod 8 has an axially extending guide rod shaft hole 16 inside. The drive body 17 slides in the guide rod shaft hole 16. The radial shaft 19 on the drive body 17 passes through the axial strip hole 20 and is connected to the upper swing arm drive connector 14. The axial strip hole 20 extends vertically and is adapted to the movement of the upper swing arm drive connector 14, while restricting the circumferential rotation of the drive body 17. The linear drive unit 18 is used to provide the driving force for the movement of the drive body 17. Furthermore, a wear-resistant guide sleeve 21 is provided between the upper swing arm drive connector 14 and the lifting guide rod 8 to ensure the stable lifting and lowering of the upper swing arm drive connector 14 on the lifting guide rod 8, while also increasing wear resistance.

[0057] In this embodiment, a radial hole is provided through the side wall of the upper swing arm connector 14, and a radial through hole is provided through the drive body 17. The radial shaft 19 has a radial through hole in its middle section, and both ends pass through axial strip holes and are inserted into the radial hole. The radial shaft 19 and the radial through hole are tightly fitted together. The lower end of the lifting drive shaft 29 is detachably fixed to the top surface of the drive body 17 by threads.

[0058] like Figure 1 , 4 As shown in Figure 5, the upper swing arm linkage rotation reset mechanism 13 includes an annular groove 22 disposed on the upper swing arm 10. The annular groove 22 is coaxially disposed with the column 2. At least two first rolling elements 23 are disposed in the annular groove 22 and are evenly distributed circumferentially and can slide within the annular groove 22. The first rolling elements 23 are connected to the upper swing arm drive connector 14 through a rolling element seat 24. An upper swing arm rotation reset assembly 69 is also disposed between the lifting guide rod 8 and the lifting sleeve 4. The rotation reset assembly 69 includes a spring bracket 25 disposed on the upper swing arm drive connector 14 and located between the lifting guide rod 8 and the lifting sleeve 4. A rotation reset spring 26 is disposed between the spring bracket 25 and the annular groove 22. The rolling element seat 24 is arc-shaped and partially surrounds the annular groove 22. The first rolling elements 23 are slidably connected to the side walls of the annular groove 22. The diameter of the first rolling elements 23 is adapted to the groove width of the annular groove 22. A second rolling element 27 is also disposed between the rolling element seat 24 and the annular groove 22 and slides in contact with the bottom of the annular groove 22.

[0059] Specifically, the first rolling element 23 on the upper swing arm drive connector 14 is confined within the annular groove 22. The upper swing arm 10 can rotate relative to the upper swing arm drive connector 14, but the lifting and lowering are synchronized. The first rolling element 23 is a cylindrical roller, and its outer ring rolls in contact with the side wall of the annular groove 22. One end of the rotary return spring 26 is connected to the upper swing arm 10, and the other end is connected to the upper swing arm drive connector 14 through the spring bracket 25. A coaxial spring groove is provided below the annular groove 22. The main body of the rotary return spring 26 is wound around the spring groove 49, which can pull the upper swing arm 10 to rotate away from the lower swing arm 9. The first rolling element 23 is arranged radially along the annular groove 22. It is mounted on the inner side wall of the rolling element seat 24 through a roller shaft. The roller shaft is detachably fixed to the threaded hole on the inner side of the rolling element seat 24 through a thread. The upper and lower sides of the first rolling element 23 are connected to the two side walls of the annular groove 22 to ensure the stability of the lifting and lowering control, while avoiding vertical jumping. The second rolling element 27 is a cylindrical roller with its axial direction parallel to that of the annular groove 22. A rolling element mounting hole is provided on the side of the rolling element seat 24. The second rolling element 27 is rotatably connected to the rolling element mounting hole through a connecting shaft. The circumferential surface of the second rolling element 27 is in contact with the bottom of the annular groove 22, ensuring the smooth rotation of the annular groove 22 relative to the rolling element seat 24.

[0060] In this embodiment, the spring bracket 25 is L-shaped, and its horizontal section is detachably fixed to the side of the upper swing arm drive connector 14 away from the part of the rotating return spring 26. A fixing post is provided in the spring groove 49. The two ends of the rotating return spring 26 are respectively connected to the fixing post and the vertical section of the spring bracket 25. The fixing post is detachably fixed in the spring groove 49 by a threaded structure.

[0061] like Figures 1-3 As shown, the linear drive unit 18 includes a linear driver 28 fixed to the top of the lifting guide rod 8. The linear driver 28 is connected to the drive body 17 via a lifting drive shaft 29. A first auxiliary lifting spring 30 is provided between the drive body 17 and the bottom of the lifting guide rod 8. The lower end of the first auxiliary lifting spring 30 abuts against the first plug 31 at the lower end of the guide rod shaft hole 16, and the upper end abuts against the drive body 17. The lifting guide rod 8 is fixed to the lifting sleeve 4 via an upper connecting seat 32 and a lower connecting seat 33. The upper swing arm 10 and the lower swing arm 9 are located between the upper connecting seat 32 and the lower connecting seat 33, and the guide seat 6 is located below the lower connecting seat 33. A lifting rotating sleeve 34 is provided between the upper swing arm 10 and the lifting sleeve 4. The upper swing arm 10 is fixed on the lifting rotating sleeve 34, and an annular clearance gap 35 is left between the lower swing arm 9 and the lifting sleeve 4. The lower end of the lifting rotating sleeve 34 is located within the annular clearance gap 35.

[0062] Specifically, the lifting driving shaft 29 is detachably connected with the output end of the linear driver 28 and the top of the driving body 17 at both ends, which is equivalent to extending the output shaft of the linear driver 28, the first auxiliary lifting spring 30 provides an upward elastic thrust to the driving body 17, reduces the load of the linear driver 28, and reduces the driving force cost, the guide rod shaft hole 16 of the lifting guide rod 8 is axially penetrated, and the lower end opening is closed by the first plug 31 to avoid the entry of sundries and facilitate the disassembly and maintenance of the first auxiliary lifting spring 30, and the first plug 31 and the lower end opening of the guide rod shaft hole 16 are detachably fixed by threads. The lifting guide rod 8 is fixed with the lifting sleeve 4 through two connecting seats, the structure is stable, the lifting rotating sleeve 34 is detachably sleeved on the lifting sleeve 4, the sleeving end of the upper swing arm 10 is sleeved on the lifting rotating sleeve 34, a radial through screw hole is arranged on the sleeving end, a tight screw is engaged in the screw hole, and the inner end is in abutment with the outer wall of the lifting rotating sleeve 34 to form a clamping and detachable fixing. The annular allowance gap 35 is used for radially allowing the lifting rotating sleeve 34 to lift, and the gap distance is adapted to the thickness of the lifting rotating sleeve 34.

[0063] In the embodiment, as shown in Figure 7 the lower connecting seat 33 is a double-hole clamp similar to an 8-shaped character, including two C-shaped parts, the two C-shaped parts are oppositely arranged and the end parts are connected through extension segments, the lifting sleeve 4 and the lifting guide rod 8 are respectively arranged in the C-shaped parts, there is a tightening gap between the two extension segments, a bolt is arranged through the two extension segments to tighten the gap, at this time, the C-shaped parts are tightened to realize the tight fitting and fixing with the lifting sleeve or the lifting guide rod, and the sleeving end of the lower swing arm 9 is sleeved on the lifting sleeve 4 and detachably fixed with one C-shaped part of the double-hole clamp through a bolt.

[0064] In the embodiment, the upper connecting seat 32 is similar to the lower connecting seat 33, but is in a sun-shaped character, also including two C-shaped parts, the driver seat 53 is fixed on the top surface of one C-shaped part through a bolt, the lower end of the C-shaped part is provided with an annular butt groove with an inner diameter adapted to the outer diameter of the lifting sleeve 4, and the top of the lifting sleeve 4 is inserted into the annular butt groove; the cylinder body of the linear driver 28 is fixed on the top of the other C-shaped part, the upper end of the lifting guide rod 8 is inserted into the C-shaped part, and the two C-shaped parts are also connected through extension segments and tightened by a bolt, so that the two C-shaped parts clamp the lifting sleeve 4 and the lifting guide rod 8 respectively to realize the fixing.

[0065] As shown in Figure 6As shown, the guide seat 6 is sleeved and fixed on the column 2 through the annular mounting portion 36, and the guide seat 6 is further provided with a D-shaped guide ring 37, which includes an arc-shaped portion 38 and a strip-shaped portion 39 detachably arranged at an opening of the arc-shaped portion 38, a guide hole 7 is formed between the strip-shaped portion 39 and the arc-shaped portion 38, and a third rolling body 40 is rotatably connected to an inner side of the strip-shaped portion 39 and an inner side wall of the arc-shaped portion 38, and the third rolling body 40 is in rolling connection with the lifting guide rod 8 and can rotate with the lifting of the lifting guide rod 8.

[0066] Specifically, the mounting portion 36 is sleeved on the column 2 and fixed on a flange portion thereof, the guide ring 37 is in D shape, a vertical segment (i.e. the strip-shaped portion 39) thereof is detachably fixed with the arc-shaped portion 38 through bolts, facilitating the disassembly and assembly of the lifting guide rod 8, and the axial direction of the third rolling body 40 is perpendicular to the axial direction of the lifting guide rod 8, and the circumferential surface thereof rolls on the lifting guide rod 8, thereby ensuring the stable positioning of the lifting guide rod 8 in the guide hole 7 and reducing the resistance of the lifting guide rod 8 relative to the column 2 during the lifting operation.

[0067] As shown in Figure 1 , 3 the column rotating driving mechanism 3 includes a first rotating driver 41 arranged on the base 1, the column 2 is rotatably connected in a column mounting hole 42 of the base 1 and is provided with a worm gear 43 at a lower end, and an output end of the first rotating driver 41 is in transmission connection with the worm gear 43 through a worm 44; the upper and lower ends of the column mounting hole 42 are respectively rotatably connected with the column 2 through an upper rolling bearing 45 and a lower rolling bearing 46.

[0068] Specifically, the first rotating driver 41 is arranged on the base 1 through a motor base, the worm 44 thereof penetrates into the base 1 and intersects with the column mounting hole 42, the lower part of the column 2 is rotatably connected to the base 1, and the worm gear 43 is further arranged at the lower end of the column 2 and is in meshing connection with the worm 44, so that the first rotating driver 41 drives the circumferential rotation of the column 2 by driving the worm 44 to rotate. The lower part of the column 2 is rotatably connected in the column mounting hole 42 through the upper rolling bearing 45 and the lower rolling bearing 46.

[0069] As shown in Figure 3As shown, the threaded screw lifting mechanism 5 includes a nut 50 arranged at the top of the stand column 2, a screw 51 screwed in the nut 50, the upper end of the screw 51 connected with a second rotary driver 52, the second rotary driver 52 connected with the lifting sleeve 4 through a driver seat 53, and a rolling bearing 54 arranged between the light pole section of the screw 51 and the driver seat 53 or the lifting sleeve 4.

[0070] Specifically, the central hole 55 axially penetrates the stand column 2, the nut 50 is fixed at the upper end of the central hole 55, the screw 51 is engaged with the screw on the lifting sleeve 4, and the second rotary driver 52 drives the rotation of the screw 51 to realize the effect of driving the lifting sleeve 4 to ascend or descend relative to the stand column 2. The second auxiliary lifting spring 56 exerts an upward elastic thrust on the lifting sleeve 4 to balance part of the gravity of the lifting sleeve 4 and its upper components, thereby reducing the driving force cost. The lower end of the central hole 55 is closed by the second plug 58 to avoid foreign matter from entering and facilitate the disassembly and maintenance of the second auxiliary lifting spring 56. The second plug 58 is detachably fixed in the opening at the lower end of the central hole 55 through threads.

[0071] As shown in Figure 1 , 5 The clutch assembly 11 includes an anti-rotation column 59 and an anti-rotation hole 60 arranged on the upper swing arm 10 and the lower swing arm 9, respectively, and extending axially. The anti-rotation column 59 can be inserted into the anti-rotation hole 60 when the upper swing arm 10 and the lower swing arm 9 are at the same rotation angle and vertically close.

[0072] Specifically, the anti-rotation column 59 and the anti-rotation hole 60 have the same distance from the axis of the stand column 2. When the upper swing arm 10 and the lower swing arm 9 are rotated to the same angle, the upper swing arm 10 and the lower swing arm 9 are located on the same vertical line. As the upper swing arm 10 and the lower swing arm 9 are vertically close, the anti-rotation column 59 is inserted into the anti-rotation hole 60, and the rotation is limited. The outer diameter of the anti-rotation column 59 and the inner diameter of the anti-rotation hole 60 are adapted to each other.

[0073] In the embodiment, the guide seat 6 is provided with a sensor frame 61, and a height sensing assembly 63 is detachably arranged in a vertical strip-shaped hole 62 of the sensor frame 61 and located at the side of the lifting guide rod 8. The height sensing assembly 63 comprises a first sensor 64 located above the guide seat 6 and a second sensor 65 located below the guide seat 6. The first sensor 64 is located at the side of the lifting path of the lower connecting seat 33, and the second sensor 65 is located at the side of the lifting path of the bottom end of the lifting guide rod 8. The base 1 is provided with a swing angle sensing assembly 66 located below the guide seat 6. The swing angle sensing assembly 66 comprises two third sensors 67 distributed in a circle. The third sensors 67 are detachably fixed to the side of the base 1 through a connecting sheet 68, and the guide seat 6 rotates between the third sensors 67.

[0074] Specifically, the sensor frame 61 is fixed to the side of the guide seat 6 through bolts, and the first sensor 64 arranged thereon is horizontally arranged. The lifting height is determined by detecting whether the lower connecting seat 33 passes. The second sensor 65 is also horizontally arranged. The lifting height is determined by detecting whether the bottom end of the lifting guide rod 8 passes the side, and also serves as a warning of the highest lifting height of the lifting guide rod 8 to avoid the lifting guide rod 8 from being out of the guide hole 7. The swing angle sensing assembly 66 is used to detect the rotation angle of the stand 2. Specifically, it is realized through two vertically arranged third sensors 67. The third sensors 67 are located below the guide seat 6 and face the guide seat 6. The guide seat 6 rotates between the third sensors 67 with the stand 2. The third sensors 67 realize corresponding swing angle position determination by detecting whether the guide ring 37 of the guide seat 6 passes the side. The third sensors 67 are arranged on the connecting sheet 68. The connecting sheet 68 is fixed to the top surface of the base through bolts. The inner side of the connecting sheet covers above the outer ring of the upper rolling bearing 45, and the upper rolling bearing 45 is limited in the stand mounting hole 42. The first sensor 64, the second sensor 65 and the third sensor 67 are selected as laser sensors.

[0075] Specific working principle: when the upper swing arm 10 and the lower swing arm 9 need to be lifted as a whole, the second rotary driver 52 acts, the screw rod 51 rotates, and drives the lifting sleeve 4 to lift the upper swing arm 10 and the lower swing arm 9; when it needs to be lowered as a whole, the second rotary driver 52 reverses the action. When the upper swing arm 10 needs to rotate away from the lower swing arm 9, the output shaft of the linear driver 28 retracts, the driving body 17 rises, the first rolling body 23 pushes the upper swing arm 10 upwards, the anti-rotation column 59 leaves the anti-rotation hole 60, and the reset spring 26 pulls the upper swing arm 10 to rotate until the side part abuts against the abutting point on the hosiery machine; when the angles need to be consistent, the second rotary driver 52 acts, the stand 2 rotates with the lifting sleeve 4, the lower swing arm 9 rotates to below the upper swing arm 10 which is limited to continue to rotate, and then the linear driver 28 reverses the action, the upper swing arm 10 descends until the anti-rotation column 59 is inserted into the anti-rotation hole 60.

[0076] The specific embodiments described herein are merely illustrative of the spirit of the present application. Those skilled in the art of the present application can make various modifications or supplements to the described specific embodiments or replace them with similar ways, but will not deviate from the spirit of the present application or exceed the scope defined by the appended claims.

Claims

1. A swing arm transfer module, comprising a base (1) and a column (2), a column rotation driving mechanism (3) being arranged between the base (1) and the column (2), a lifting sleeve (4) being sleeved on the column (2), and a screw rod lifting mechanism (5) being arranged between the lifting sleeve (4) and the column (2), characterized in that, The column (2) is fixed with a guide seat (6) on one side, a lifting guide rod (8) is arranged in the guide hole (7) of the guide seat (6) and is parallel to the column (2), the lifting guide rod (8) is fixedly connected with the lifting sleeve (4), the lifting sleeve (4) is sleeved with a lower swing arm (9) and an upper swing arm (10), the lower swing arm (9) is fixedly connected with the lifting sleeve (4), the upper swing arm (10) is movably connected with the lifting sleeve (4), a clutch assembly (11) is arranged between the upper swing arm (10) and the lower swing arm (9), an upper swing arm lifting mechanism (12) is arranged between the upper swing arm (10) and the lifting guide rod (8), and an upper swing arm linkage rotary reset mechanism (13) capable of driving the upper swing arm (10) to axially move and enabling the upper swing arm (10) to rotate and reset is arranged between the upper swing arm (10) and the upper swing arm lifting mechanism (12).

2. The swing arm transfer module of claim 1, wherein, The upper swing arm lifting mechanism (12) comprises an upper swing arm driving connecting piece (14) sleeved on the lifting guide rod (8), a lifting driving assembly (15) is arranged between the upper swing arm driving connecting piece (14) and the lifting guide rod (8), the upper swing arm driving connecting piece (14) is connected with the upper swing arm (10), and the upper swing arm linkage rotary reset mechanism (13) capable of driving the upper swing arm (10) to axially move and enabling the upper swing arm (10) to rotate and reset is arranged between the upper swing arm driving connecting piece (14) and the upper swing arm linkage rotary reset mechanism (13).

3. The swing arm transfer module of claim 2, wherein, The lifting driving assembly (15) comprises a driving body (17) capable of axially moving and arranged in a guide rod shaft hole (16) of the lifting guide rod (8), a linear driving unit (18) is arranged between the driving body (17) and the lifting guide rod (8), N radial shafts (19) are arranged on the driving body (17) and are distributed in a circumferential direction, N is greater than or equal to 1, an axial strip-shaped hole (20) capable of enabling the guide rod shaft hole (16) to be in radial communication with the outside and equal in number to the radial shafts (19) is formed in the lifting guide rod (8), the radial shafts (19) pass through the axial strip-shaped hole (20) and are in one-to-one correspondence, and outer ends of the radial shafts (19) are connected with the upper swing arm driving connecting piece (14).

4. The swing arm transfer module of claim 2, wherein, The upper swing arm linkage rotary reset mechanism (13) comprises an annular groove (22) arranged on the upper swing arm (10) and coaxially arranged with the column (2), at least two first rolling bodies (23) capable of sliding in the annular groove (22) and uniformly distributed in a circumferential direction are arranged in the annular groove (22), the first rolling bodies (23) are connected with the upper swing arm driving connecting piece (14) through rolling body seats (24), and the lifting guide rod (8) and the lifting sleeve (4) are further provided with an upper swing arm rotary reset assembly (69).

5. The swing arm transfer module of claim 4, wherein, The rotary reset assembly (69) comprises a spring support (25) arranged on the upper swing arm driving connecting piece (14) and located between the lifting guide rod (8) and the lifting sleeve (4), and a rotary reset spring (26) is arranged between the spring support (25) and the annular groove (22).

6. The swing arm transfer module of claim 4, wherein, The rolling body seat (24) is arc-shaped and partially embraces the annular groove (22), the first rolling body (23) is in sliding connection with the side walls on both sides of the annular groove (22), the diameter of the first rolling body (23) is adapted to the groove width of the annular groove (22), and at least one second rolling body (27) in sliding contact with the groove bottom of the annular groove (22) is further arranged between the rolling body seat (24) and the annular groove (22).

7. The swing arm transfer module of claim 3, wherein, The linear driving unit (18) comprises a linear driver (28) fixed at the top of the lifting guide rod (8), and the linear driver (28) is connected with the driving body (17) through a lifting driving shaft (29). The first auxiliary lifting spring (30) is arranged between the driving body (17) and the bottom of the lifting guide rod (8), the lower end of the first auxiliary lifting spring (30) abuts against the first plug (31) at the lower end of the guide rod shaft hole (16), and the upper end abuts against the driving body (17).

8. The swing arm transfer module of any of claims 1-7, wherein, The lifting guide rod (8) is fixed with the lifting sleeve (4) through an upper connecting seat (32) and a lower connecting seat (33), the upper swing arm (10) and the lower swing arm (9) are located between the upper connecting seat (32) and the lower connecting seat (33), and the guide seat (6) is located below the lower connecting seat (33). The lifting rotating sleeve (34) is arranged between the upper swing arm (10) and the lifting sleeve (4), the upper swing arm (10) is fixed on the lifting rotating sleeve (34), and the annular accommodation gap (35) is left between the lower swing arm (9) and the lifting sleeve (4), and the lower end of the lifting rotating sleeve (34) is arranged in the annular accommodation gap (35).

9. The swing arm transfer module of any of claims 1-7, wherein, The column rotating driving mechanism (3) comprises a first rotating driver (41) arranged on the base (1), the column (2) is rotationally connected in a column mounting hole (42) of the base (1), and the lower end is provided with a worm wheel (43), and the output end of the first rotating driver (41) is in transmission connection with the worm wheel (43) through a worm (44); the upper and lower ends of the column mounting hole (42) are respectively rotationally connected with the column (2) through an upper rolling bearing (45) and a lower rolling bearing (46).

10. The swing arm transfer module of any of claims 1-7, wherein, The threaded screw lifting mechanism (5) comprises a nut (50) arranged at the top of the column (2), the nut (50) is internally screwed with a screw rod (51), the upper end of the screw rod (51) is connected with a second rotating driver (52), the second rotating driver (52) is connected with the lifting sleeve (4) through a driver seat (53), and a rolling bearing (54) is arranged between the light rod section of the screw rod (51) and the driver seat (53) or the lifting sleeve (4). The column (2) is provided with an axially extending central hole (55), the nut (50) is detachably fixed on the upper end of the central hole (55), the lower end of the screw rod (51) extends into the central hole (55), a second auxiliary lifting spring (56) is arranged between the bottom of the central hole (55) and the screw rod (51), the upper end of the second auxiliary lifting spring (56) is connected with the bottom of the screw rod (51) through a plane bearing (57), and the lower end abuts against a second plug (58) at the lower end of the central hole (55). The clutch assembly (11) comprises an anti-rotation post (59) and an anti-rotation hole (60) arranged on the upper swing arm (10) and the lower swing arm (9) respectively and extending axially, the anti-rotation post (59) being capable of being inserted into the anti-rotation hole (60) when the upper swing arm (10) and the lower swing arm (9) are at the same rotation angle and vertically close.

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