A semi-automatic packing machine with cantilever crane
The cantilevered semi-automatic baling machine solves the problems of time-consuming, labor-intensive, and costly steel coil baling by combining equipment feeding and manual baling and buckling. It achieves efficient, safe, and low-cost baling and expands the baling range.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ANHUI SHENTAI INTELLIGENT EQUIP CO LTD
- Filing Date
- 2025-06-09
- Publication Date
- 2026-06-23
AI Technical Summary
Existing methods for packaging steel coils are time-consuming, labor-intensive, pose significant safety hazards, and involve high equipment costs and large footprints. In particular, manual packaging results in poor quality, while automated equipment is expensive and requires a large footprint.
A cantilever-type semi-automatic baling machine was designed. The machine feeds the steel coils, and the operator performs the baling and buckling. Combined with the rotation and movement functions of the cantilever components, it can efficiently bale steel coils of different diameters, avoid safety accidents, and the equipment is simple, inexpensive, and does not occupy a large space.
It improves packaging quality and efficiency, avoids safety accidents, reduces equipment costs, expands the packaging range, and does not occupy a large amount of space. The rotation function of the cantilever crane component prevents damage from high temperatures and avoids obstructing on-site operations.
Smart Images
Figure CN224393053U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of baling machines, specifically to a cantilevered semi-automatic baling machine. Background Technology
[0002] Steel coils generally refer to sheet or strip materials with a circular cross-section, rolled into a coil shape by a continuous rolling mill or reversible rolling mill. Coils can generally undergo further machining. They can be cut into various shapes to meet the needs of industrial production. Many materials can be made into steel coils, such as galvanized sheet, cold-rolled sheet, hot-rolled sheet, color-coated sheet, aluminum sheet, and copper sheet. Before transportation, steel coils need to be bundled with packing straps to facilitate storage, transportation, and subsequent handling.
[0003] There are two main types of packaging methods: one is manual packaging, which is time-consuming and labor-intensive, has poor packaging quality, and is prone to safety accidents during the packaging process; the other is fully automated equipment packaging, which is more expensive and requires a large space. Utility Model Content
[0004] The problem this invention aims to solve is to provide a cantilevered semi-automatic strapping machine that allows the strapping tape to be fed by the machine, with manual intervention only required when fastening the straps. This ensures strapping quality, improves efficiency, avoids safety accidents, and features simple equipment, low cost, and minimal space requirement. Furthermore, it expands the strapping range and prevents the manual strapping head from being damaged by the high temperature of the transported steel coils.
[0005] This utility model discloses a cantilever-type semi-automatic baling machine, which includes a column, a crossbeam, a cantilever assembly, belt track I, belt track II, a scissor assembly, a belt reel, and a belt feeding assembly. The column and belt reel are fixed on the foundation and located at both ends of the support roller. The scissor assembly is connected to the foundation and can move left and right. The cantilever assembly and the crossbeam are arranged vertically. The right end of the crossbeam is fixedly connected to the upper end of the column. The right end of the cantilever assembly is connected to the upper end of the column. Belt track I is fixed to the left side of the column, and belt track II is fixed below the crossbeam. Belt track I and belt track II are in the same plane. The belt feeding assembly is fixedly connected to the left end of the crossbeam.
[0006] Furthermore, the sword-piercing assembly includes a bracket, a sword-piercing guide groove, a linear guide rail, a slider, and a first cylinder; the bracket is fixed on the foundation, and the linear guide rail is fixed on the bracket; the sword-piercing guide groove is connected to the top of the slider, the slider is slidably connected to the linear guide rail, and the first cylinder is fixed on the bracket, with its piston rod connected to the sword-piercing guide groove via a first screw.
[0007] Furthermore, the cantilever crane assembly includes a manual packing head, a cantilever crane bracket, and a hook assembly; the right end of the cantilever crane bracket is connected to the upper end of the column, the hook assembly is connected to the left end of the cantilever crane bracket, and the manual packing head is connected to the lower part of the hook assembly.
[0008] Furthermore, the cantilever crane assembly also includes a pin, a first bearing, a cover plate, and a second screw; the right connecting part of the cantilever crane bracket is located between the upper and lower mounting plates on the upper part of the column, the pin passes through the upper mounting plate, the inner hole of the cantilever crane bracket, and the lower mounting plate, the two cover plates are respectively pressed tightly on the upper and lower surfaces of the upper and lower mounting plates, the upper and lower second screws are respectively connected to the upper and lower end faces of the pin and press the upper and lower cover plates, and the upper and lower first bearings are provided between the upper and lower ends of the inner hole of the cantilever crane bracket and the pin.
[0009] Furthermore, the cantilever assembly also includes multiple carriages, which are connected to the cantilever support.
[0010] Furthermore, the hook assembly includes a connecting plate, a connecting pin, a second bearing, a locking nut, and a hook plate; an I-beam is connected to the lower left side of the cantilever crane bracket, with a connecting plate at the front and rear of the I-beam, and a second bearing between the front and rear connecting plates and the I-beam; the connecting pin passes through the second bearing and the upper part of the connecting plate and connects to the locking nut; the hook plate is located between the front and rear connecting plates, and the connecting pin passes through the hook plate and the lower part of the front and rear connecting plates and connects to the locking nut; the manual packing head is connected to the bottom hole of the hook plate through the hook.
[0011] Furthermore, the hook assembly also includes spacers, with spacers provided between the hook plate and the front and rear connecting plates.
[0012] Furthermore, the belt feeding assembly includes a guide wheel bracket, a guide wheel, a motor, a second cylinder, a connecting rod, a belt feeding track, a small synchronous pulley, a synchronous belt, a large synchronous pulley, a large pin shaft, a belt feeding wheel, and a clamping wheel; the right end of the belt feeding track is fixedly connected to the left end of the crossbeam, and the left end is fixedly connected to the guide wheel bracket, with the guide wheel mounted on the guide wheel bracket; the motor is fixed above the belt feeding track, and its output shaft extends rearward to connect to the small synchronous pulley; the second cylinder is hinged to the connecting part above the belt feeding track, and its telescopic rod is hinged to the upper part of the connecting rod; the front and rear ends of the large pin shaft are respectively connected to the belt feeding wheel and the large synchronous pulley; the synchronous belt connects the small synchronous pulley and the large synchronous pulley; the clamping wheel is connected to the lower middle part of the front rod of the connecting rod and is located below the belt feeding wheel.
[0013] Furthermore, the belt feeding assembly also includes a small pin and a third bearing. The small pin is connected to the front and rear rods of the connecting rod. The clamping wheel is sleeved on the small pin. The front and rear ends of the inner hole of the clamping wheel are provided with the third bearing between them and the small pin. The middle part of the large pin passes through the middle of the belt feeding track and is provided with the third bearing between it and the support part on the belt feeding track.
[0014] The advantages of this utility model are: 1. It ensures packaging quality, improves packaging efficiency, avoids safety accidents, and is simple, inexpensive, and does not require a large space; 2. The manual packaging head can move left and right and up and down to the appropriate position to fasten, realizing the packaging of steel coils of different diameters and expanding the packaging range; 3. The cantilever crane assembly can rotate: when packaging is not required, the cantilever crane assembly can be rotated to a suitable area away from the steel coil, which can prevent the manual packaging head from being burned by the high temperature of the transported steel coil and also prevent the cantilever crane assembly from obstructing the on-site working environment; when packaging is required, the cantilever crane assembly can be rotated to a position near the belt track II to fasten. Attached Figure Description
[0015] Figure 1 This is a perspective view of the packaging machine of this utility model.
[0016] Figure 2 This is the front view of the packaging machine of this utility model.
[0017] Figure 3 This is the main view of the sword-piercing component.
[0018] Figure 4 For along Figure 3 Sectional view of AA.
[0019] Figure 5 This is the front view of the cantilever crane assembly.
[0020] Figure 6 For along Figure 2 A cross-sectional view along the BB line.
[0021] Figure 7 For along Figure 5 A cross-sectional view of the CC line.
[0022] Figure 8 This is the main view of the delivery component.
[0023] Figure 9 For along Figure 8 A cross-sectional view of the DD line. Detailed Implementation
[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.
[0025] Example 1
[0026] from Figure 1 , Figure 2As can be seen, this utility model discloses a cantilever-type semi-automatic baling machine, which includes a column 1, a crossbeam 2, a cantilever assembly 3, a belt guide I 4, a belt guide II 5, a piercing assembly 6, a belt reel 7, and a belt feeding assembly 8. The column 1 and the belt reel 7 are both fixed on the foundation and are located at both ends of the support roller 10, respectively. The piercing assembly 6 is connected to the foundation and can move left and right. The cantilever assembly 3 and the crossbeam 2 are arranged vertically. The right end of the crossbeam 2 is fixedly connected to the upper end of the column 1. The right end of the cantilever assembly 3 is connected to the upper end of the column 1. The belt guide I 4 is fixed to the left side of the column 1, and the belt guide II 5 is fixed below the crossbeam 2. The belt guide I 4 and the belt guide II 5 are in the same plane. The belt feeding assembly 8 is fixedly connected to the left end of the crossbeam 2.
[0027] The working principle of this utility model is as follows: Belt I4 and Belt II5 form a fixed belt path around the steel coil 9, which is a large semicircle through which the packing strap can pass. When packing is required: the piercing component 6 moves to the right to the left end of the belt I4 and forms a complete belt path with the fixed belt path. The belt reel 7 starts to feed the belt. After the packing strap comes out from the piercing component 6, the manual pulls the packing strap up onto the steel coil. The manual packing head 35 on the cantilever crane component 3 fastens the strap to complete the packing.
[0028] Example 2
[0029] from Figure 1 , Figure 2 , Figure 3 , Figure 4 As can be seen, the present invention discloses a cantilevered semi-automatic baling machine: the piercing component 6 includes a bracket 61, a piercing guide groove 62, a linear guide rail 63, a slider 64, and a first cylinder 65; the bracket 61 is fixed on the foundation, and the linear guide rail 63 is fixed on the bracket 61; the piercing guide groove 62 is connected to the top of the slider 64, the slider 64 is slidably connected to the linear guide rail 63, and the first cylinder 65 is fixed on the bracket 61, and its piston rod is connected to the piercing guide groove 62 through a first screw 66.
[0030] Before the steel coil 9 is in place for packaging, the first cylinder 65 operates, and its piston rod pushes the through-sword guide groove 62 through the gap above the support roller 10 to the left end of the belt track I4 to form a complete belt track for packaging; after packaging is completed, the first cylinder 65 operates, and its piston rod drives the through-sword guide groove 62 to leave the belt track I4 and return to the initial position.
[0031] Among them: the bracket 61 is a welded component, and its base plate is fixed to the foundation by anchor bolts to provide support; the linear guide rail 63 plays the role of linear guidance and reducing friction.
[0032] Example 3
[0033] from Figure 1 , Figure 2 , Figure 5As can be seen, the present invention provides a cantilever-type semi-automatic packing machine: the cantilever assembly 3 includes a manual packing head 35, a cantilever support 36, and a hook assembly 38; the right end of the cantilever support 36 is connected to the upper end of the column 1, the hook assembly 38 is connected to the left end of the cantilever support 36, and the manual packing head 35 is connected to the lower part of the hook assembly 38.
[0034] The upper part of the manual strapping head 35 is an elastic element, which can move up and down relative to the hook assembly 38. After the strapping has wrapped around the steel coil 9 once, the manual strapping head 35 is pulled up and down by hand to the appropriate position to secure the strapping.
[0035] Example 4
[0036] from Figure 1 , Figure 2 , Figure 5 , Figure 6 As can be seen, the cantilever semi-automatic baling machine of this utility model includes a cantilever assembly 3, a pin 31, a first bearing 32, a cover plate 33, and a second screw 34. The right connecting part of the cantilever bracket 36 is located between the upper and lower mounting plates on the upper part of the column 1. The pin 31 passes through the upper mounting plate, the inner hole of the cantilever bracket 36, and the lower mounting plate. The two cover plates 33 are respectively pressed tightly on the upper and lower surfaces of the upper and lower mounting plates. The upper and lower second screws 34 are respectively connected to the upper and lower end faces of the pin 31 and press the upper and lower cover plates 33. The upper and lower first bearings 32 are provided between the upper and lower ends of the inner hole of the cantilever bracket 36 and the pin 31.
[0037] When the cantilever crane assembly 3 is fixedly connected to the column 1, the steel coil 9, which is in a high-temperature state, is easily damaged by touching the cantilever crane assembly 3 during transportation. Therefore, as an improvement of this utility model, the cantilever crane assembly 3 and the column 1 are rotatably connected: the cantilever crane bracket 36 can rotate relative to the column 1 through the pin 31 and the first bearing 32. In this way, when packaging is not required, the cantilever crane assembly 3 can be rotated to a suitable area away from the steel coil 9, which can prevent the manual packaging head 35 from being damaged by the high temperature of the transported steel coil 9, and also prevent the cantilever crane assembly 3 from obstructing the on-site working environment. When packaging is required, when the packaging strap needs to be fastened after passing through the belt channel and wrapping around the steel coil 9, the cantilever crane assembly 3 is manually pulled to rotate to a position near the belt channel II5, and then the manual packaging head 35 is pulled to a suitable position on the steel coil 9 to fasten.
[0038] Example 5
[0039] from Figure 1 , Figure 2 , Figure 5 As can be seen, the cantilever-type semi-automatic packaging machine of this utility model includes a cantilever assembly 3, which also includes multiple slides 37, and the multiple slides 37 are connected to the cantilever support 36.
[0040] When the manual packing head 35 is driven by pneumatics, the carriage 37 is used to fix and place the air inlet pipe.
[0041] Example 6
[0042] from Figure 1 , Figure 2 , Figure 5 , Figure 7 As can be seen, this utility model discloses a cantilever-type semi-automatic baling machine: the hook assembly 38 includes a connecting plate 381, a connecting pin 382, a second bearing 383, a locking nut 384, and a hook plate 385; an I-beam is connected to the lower left side of the cantilever bracket 36, and a connecting plate 381 is provided at the front and rear of the bracket. A second bearing 383 is provided between the front and rear connecting plates 381 and the I-beam. The connecting pin 382 passes through the second bearing 383 and the upper part of the connecting plate 381 and is connected to the locking nut 384; the hook plate 385 is located between the front and rear connecting plates 381, and the connecting pin 382 passes through the hook plate 385 and the lower part of the front and rear connecting plates 381 and is connected to the locking nut 384; the manual baling head 35 is connected to the bottom hole of the hook plate 385 through a hook.
[0043] The second bearing 383 can slide on the guide rail of the I-beam. When the manual packing head 35 is pulled by hand, it moves left and right through the hook assembly 38. In this way, the manual packing head 35 moves to the appropriate position to pack and fasten according to the size of the steel coil diameter, thereby expanding the packing range.
[0044] Example 7
[0045] from Figure 1 , Figure 2 , Figure 5 , Figure 7 As can be seen, the cantilevered semi-automatic baling machine of this utility model includes a hook assembly 38, which also includes a spacer 386. The hook plate 385 and the front and rear connecting plates 381 are both provided with spacers 386.
[0046] Spacer 386 limits the front and rear positions of hook plate 385.
[0047] Example 8
[0048] from Figure 1 , Figure 2 , Figure 8 , Figure 9As can be seen, the present invention discloses a cantilevered semi-automatic baling machine: the tape feeding assembly 8 includes a guide wheel bracket 801, a guide wheel 802, a motor 803, a second cylinder 804, a connecting rod 805, a tape feeding track 806, a small synchronous pulley 807, a synchronous belt 808, a large synchronous pulley 809, a large pin shaft 810, a tape feeding wheel 811, and a clamping wheel 812; the right end of the tape feeding track 806 is fixedly connected to the left end of the crossbeam 2, and the left end is fixedly connected to the guide wheel bracket 801; the guide wheel 802 is mounted on the guide wheel bracket 801. 01 Above; Motor 803 is fixed on the top of the conveyor belt 806, and its output shaft extends rearward to connect to the small synchronous pulley 807; The second cylinder 804 is hinged to the connecting part on the top of the conveyor belt 806, and its telescopic rod is hinged to the upper part of the connecting rod 805; The front and rear ends of the large pin shaft 810 are connected to the conveyor belt pulley 811 and the large synchronous pulley 809 respectively; The synchronous belt 808 connects the small synchronous pulley 807 and the large synchronous pulley 809; The clamping wheel 812 is connected to the lower middle part of the front rod of the connecting rod 805 and is located below the conveyor belt pulley 811.
[0049] When belt feeding is required: Motor 803 operates, driving the belt feeding wheel 811 to rotate via the small synchronous pulley 807, synchronous belt 808, and large synchronous pulley 809; simultaneously, the second cylinder 804 operates, driving the clamping wheel 812 to a suitable position via connecting rod 805 to work together with the belt feeding wheel 811 to press the strapping belt, thus achieving belt feeding. Guide wheel 802 guides the conveying of the strapping belt, which is then transported below the belt feeding wheel 811.
[0050] Example 9
[0051] from Figure 1 , Figure 2 , Figure 8 , Figure 9 As can be seen, the cantilevered semi-automatic baling machine of this utility model includes a feeding assembly 8, which further includes a small pin 813 and a third bearing 814. The small pin 813 is connected to the front and rear rods of the connecting rod 805. The clamping wheel 812 is sleeved on the small pin 813. The third bearing 814 is provided between the front and rear ends of the inner hole of the clamping wheel 812 and the small pin 813. The middle part of the large pin 810 passes through the middle part of the feeding track 806 and the third bearing 814 is provided between it and the support part on the feeding track 806.
[0052] The clamping wheel 812 rotates relative to the small pin 813 via the third bearing 814 to convey the packing strap. The large pin 810 rotates via the third bearing 814 to drive the feed wheel 811.
[0053] The working principle of this cantilever-type semi-automatic baling machine is as follows: When the steel coil 9 is transported to the baling position, the first cylinder 65 operates to push the through-sword guide groove 62 to the left side of the belt track I4 to form a complete belt track; the belt reel 7 begins to feed the baling strap. After the baling strap passes through the guide wheel 802, the feeding wheel 811, the clamping wheel 812, the belt track II5, the belt track I4, and the through-sword guide groove 62, the baling strap is manually pulled upwards onto the steel coil. The cantilever crane assembly 3 is then pulled to rotate in front of the belt track II5, and the manual baling head 35 is pulled onto the steel coil to fasten the strap. After baling is completed, the cantilever crane assembly 3 leaves the belt track II5, and the through-sword guide groove 62 leaves the belt track I4 and returns to the initial position.
[0054] In this utility model, a cantilever-type semi-automatic baling machine is used where the strapping is fed by the machine, with manual intervention only required during the buckling process. Therefore, the advantages of this utility model are: 1. It ensures baling quality, improves baling efficiency, avoids safety accidents, is simple in equipment, has low cost, and does not require a large site area; 2. The manual baling head moves left and right and up and down to the appropriate position for buckling, enabling baling of steel coils of different diameters and expanding the baling range; 3. The cantilever assembly can rotate: when baling is not required, the cantilever assembly can be rotated to a suitable area away from the steel coil, preventing the manual baling head from being burned by the high temperature of the transported steel coil and preventing the cantilever assembly from obstructing the on-site working environment; when baling is required, the cantilever assembly can be rotated to a position near the belt track II for buckling.
Claims
1. A cantilever-type semi-automatic baling machine, characterized in that: It includes a column (1), a crossbeam (2), a cantilever assembly (3), a belt track I (4), a belt track II (5), a piercing assembly (6), a belt reel (7), and a belt feeding assembly (8); the column (1) and the belt reel (7) are fixed on the foundation and located at both ends of the support roller (10), the piercing assembly (6) is connected to the foundation and can move left and right, the cantilever assembly (3) and the crossbeam (2) are set up vertically, the right end of the crossbeam (2) is fixedly connected to the upper end of the column (1), the right end of the cantilever assembly (3) is connected to the upper end of the column (1), the belt track I (4) is fixed on the left side of the column (1), the belt track II (5) is fixed below the crossbeam (2), the belt track I (4) and the belt track II (5) are in the same plane, and the belt feeding assembly (8) is fixedly connected to the left end of the crossbeam (2).
2. The cantilevered semi-automatic baling machine according to claim 1, characterized in that: The sword-piercing assembly (6) includes a bracket (61), a sword-piercing guide groove (62), a linear guide rail (63), a slider (64), and a first cylinder (65); the bracket (61) is fixed on the foundation, and the linear guide rail (63) is fixed on the bracket (61); the sword-piercing guide groove (62) is connected to the top of the slider (64), the slider (64) is slidably connected to the linear guide rail (63), and the first cylinder (65) is fixed on the bracket (61), and its piston rod is connected to the sword-piercing guide groove (62) through a first screw (66).
3. The cantilevered semi-automatic baling machine according to claim 1, characterized in that: The cantilever crane assembly (3) includes a manual packing head (35), a cantilever crane bracket (36), and a hook assembly (38); the right end of the cantilever crane bracket (36) is connected to the upper end of the column (1), the hook assembly (38) is connected to the left end of the cantilever crane bracket (36), and the manual packing head (35) is connected to the lower part of the hook assembly (38).
4. A cantilevered semi-automatic baling machine according to claim 3, characterized in that: The cantilever crane assembly (3) also includes a pin (31), a first bearing (32), a cover plate (33), and a second screw (34). The right connecting part of the cantilever crane bracket (36) is located between the upper and lower mounting plates on the upper part of the column (1). The pin (31) passes through the upper mounting plate, the inner hole of the cantilever crane bracket (36), and the lower mounting plate. The two cover plates (33) are pressed tightly on the upper and lower surfaces of the upper and lower mounting plates respectively. The upper and lower second screws (34) are connected to the upper and lower end faces of the pin (31) respectively and press the upper and lower cover plates (33). The upper and lower first bearings (32) are provided between the upper and lower ends of the inner hole of the cantilever crane bracket (36) and the pin (31).
5. A cantilevered semi-automatic baling machine according to claim 3, characterized in that: The cantilever assembly (3) also includes multiple carriages (37) which are connected to the cantilever support (36).
6. A cantilevered semi-automatic baling machine according to claim 1, characterized in that: The hook assembly (38) includes a connecting plate (381), a connecting pin (382), a second bearing (383), a locking nut (384), and a hook plate (385). The lower left side of the cantilever bracket (36) is connected to an I-beam, and a connecting plate (381) is provided at the front and back of the bracket. A second bearing (383) is provided between the front and back connecting plates (381) and the I-beam. The connecting pin (382) passes through the second bearing (383) and the upper part of the connecting plate (381) and is connected to the locking nut (384). The hook plate (385) is located between the front and back connecting plates (381). The connecting pin (382) passes through the hook plate (385) and the lower part of the front and back connecting plates (381) and is connected to the locking nut (384). The manual packing head (35) is connected to the bottom hole of the hook plate (385) through the hook.
7. A cantilevered semi-automatic baling machine according to claim 6, characterized in that: The hook assembly (38) also includes a spacer (386), and a spacer (386) is provided between the hook plate (385) and the front and rear connecting plates (381).
8. A cantilevered semi-automatic baling machine according to claim 1, characterized in that: The belt feeding assembly (8) includes a guide wheel bracket (801), a guide wheel (802), a motor (803), a second cylinder (804), a connecting rod (805), a belt feeding track (806), a small synchronous pulley (807), a synchronous belt (808), a large synchronous pulley (809), a large pin (810), a belt feeding wheel (811), and a clamping wheel (812); the right end of the belt feeding track (806) is fixedly connected to the left end of the crossbeam (2), and the left end is fixedly connected to the guide wheel bracket (801); the guide wheel (802) is mounted on the guide wheel bracket (801); the motor (803) 03) Fixed on the top of the conveyor belt (806), its output shaft extends rearward to connect to the small synchronous pulley (807); the second cylinder (804) is hinged to the connecting part on the conveyor belt (806), and its telescopic rod is hinged to the upper part of the connecting rod (805); the front and rear ends of the large pin shaft (810) are connected to the conveyor belt pulley (811) and the large synchronous pulley (809) respectively; the synchronous belt (808) is connected to the small synchronous pulley (807) and the large synchronous pulley (809); the clamping wheel (812) is connected to the middle and lower part of the front rod of the connecting rod (805) and is located below the conveyor belt pulley (811).
9. A cantilevered semi-automatic baling machine according to claim 8, characterized in that: The belt feeding assembly (8) also includes a small pin (813) and a third bearing (814). The small pin (813) is connected to the front and rear rods of the connecting rod (805). The clamping wheel (812) is sleeved on the small pin (813). The third bearing (814) is provided between the front and rear ends of the inner hole of the clamping wheel (812) and the small pin (813). The middle part of the large pin (810) passes through the middle part of the belt feeding track (806) and the third bearing (814) is provided between it and the bracket part on the belt feeding track (806).