A yarn package stacking device

Abstract

The utility model discloses a kind of yarn bobbin stacking devices, including rack, lifting mechanism located in rack and switching mechanism located in the upper part of rack, rack includes storage tank, the upper part of storage tank is opening, lifting mechanism includes lifting platform and second driver, lifting platform is located in storage tank, lifting platform is connected with second driver, lifting platform moves up and down by second driver, to cover the opening in the upper part of storage tank, second driver is fixedly connected with rack, switching mechanism includes movable plate and fourth driver, movable plate is connected with fourth driver, movable platform moves horizontally by fourth driver, to cover the opening in the upper part of storage tank or with the opening in the upper part of storage tank misregistration.The utility model can realize the automatic stacking operation of two layers of yarn bobbins by setting conveying mechanism, first pushing mechanism, lifting mechanism and switching mechanism, and the efficiency is high.

Description

Technical Field

[0001] This utility model relates to automated stacking equipment, and more specifically, to a yarn bobbin stacking device. Background Technology

[0002] After the yarn bobbins are manufactured, they need to be packed into cardboard boxes and transported to textile factories. According to the needs of some users, the packaging boxes need to be stacked with two layers of yarn bobbins. Currently, this is done manually before packing into the cardboard boxes, which is inefficient and therefore urgently needs to be improved. Utility Model Content

[0003] The purpose of this utility model is to overcome the shortcomings of the prior art and provide a yarn bobbin stacking device. By setting a conveying mechanism, a first pushing mechanism, a lifting mechanism and a switching mechanism, it can realize the automatic stacking operation of two layers of yarn bobbins with high efficiency.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: a yarn bobbin stacking device, comprising a frame, a lifting mechanism located within the frame, and a switching mechanism located on the upper part of the frame. The frame includes a storage trough with an opening at the top. The lifting mechanism includes a lifting platform and a second driver. The lifting platform is located within the storage trough and is connected to the second driver. The lifting platform moves up and down via the second driver to cover the opening at the top of the storage trough. The second driver is fixedly connected to the frame. The switching mechanism includes a movable plate and a fourth driver. The movable plate is connected to the fourth driver and moves horizontally via the fourth driver to cover the opening at the top of the storage trough or to be misaligned with the opening at the top of the storage trough.

[0005] Furthermore, it also includes a conveying mechanism and a first pushing mechanism. The conveying mechanism is arranged along the length of the frame, and the first pushing mechanism is located above the frame and opposite to the switching mechanism. The storage tank is located between the first pushing mechanism and the switching mechanism. The first pushing mechanism moves horizontally through the conveying mechanism to move closer to or further away from the switching mechanism.

[0006] Furthermore, the first pushing mechanism includes a support plate, a first driver is fixed on the upper part of the support plate, a first push plate is provided below the support plate, and the telescopic rod of the first driver is fixedly connected to the first push plate.

[0007] Furthermore, it also includes a positioning mechanism located on the upper part of the frame. The positioning mechanism is arranged opposite to the first pushing mechanism. The positioning mechanism includes a positioning plate and a third driver. The positioning plate is directly opposite the first pushing plate. The positioning plate moves horizontally by the third driver so that it is positioned above the storage tank or misaligned with the upper opening of the storage tank.

[0008] Furthermore, it also includes a second pushing mechanism located on the upper part of the frame. The second pushing mechanism includes a second pushing plate and a fifth driver. The second pushing plate moves horizontally by the fifth driver so that it is positioned above the storage tank or misaligned with the upper opening of the storage tank. The moving trajectory of the second pushing plate forms a right angle with the moving trajectory of the movable plate.

[0009] Furthermore, the upper part of the frame is provided with a placement platform, which is located on the side of the storage tank away from the switching mechanism.

[0010] Furthermore, a screw is threadedly connected to the bottom of the storage tank, and the upper end of the screw is located inside the storage tank. The lifting platform moves up and down to abut or disengage from the upper end of the screw.

[0011] Furthermore, the conveying mechanism includes a conveyor frame fixed above the machine frame, a horizontal conveying belt installed on the conveyor frame, a guide rail fixed to the side of the conveyor frame, a support plate fixedly connected to one side of the belt, a groove adapted to the guide rail provided in the support plate, the guide rail being embedded in the groove, and the belt reciprocating horizontally to drive the first pushing mechanism to move horizontally reciprocating along the guide rail.

[0012] Furthermore, the support plate and the belt are fixedly connected by a connecting plate and a clamp. The vertical section of the connecting plate abuts against the outer side of one side of the belt and the clamp abuts against the inner side of the belt. The connecting plate and the clamp are locked together by bolts. The conveying mechanism also includes a drag chain belt arranged along its length. One end of the connecting plate is fixed to the support plate and the other end is fixed to one end of the drag chain belt. The other end of the drag chain belt is fixed to the conveyor frame.

[0013] Furthermore, the inner walls on both sides of the storage tank are provided with sliding grooves arranged along its length. The movable plate includes a hinge seat located at its lower part and corresponding to the sliding groove. A pulley is hinged to the outside of the hinge seat. The sliding groove is sleeved on the outside of the pulley. Rollers are fixed on both sides of the inside of the frame near the storage tank. The lower part of the movable plate abuts against the upper part of the roller.

[0014] The frame also includes a first support, a second support, a third support, and a fourth support. The first support is fixedly connected to the conveying mechanism, the second support is fixedly connected to the positioning mechanism, the third support is fixedly connected to the switching mechanism, and the fourth support is fixedly connected to the second pushing mechanism. The first driver, the second driver, the third driver, the fourth driver, and the fifth driver are all cylinders.

[0015] In summary, this utility model has the following beneficial effects:

[0016] After three yarn bobbins are placed side-by-side on the upper part of the lifting platform, the platform descends, placing the three yarn bobbins in the storage tank. Once the yarn bobbins on the upper part of the lifting platform are in the storage tank, the fourth drive moves the movable plate until it closes the upper opening of the storage tank. At this point, the movable plate is directly above the lifting platform, with its upper surface lower than the surface of the placement platform. After three yarn bobbins are placed side-by-side on the upper part of the movable plate, the fourth drive quickly resets the movable plate, causing the three yarn bobbins on the upper part of the movable plate to fall onto the three yarn bobbins on the upper part of the lifting platform, achieving automatic stacking of two layers of yarn bobbins. Once the upper layer of yarn bobbins is stacked on top of the lower layer, the lifting platform rises again to reset, ensuring that both layers of yarn bobbins are located on the upper part of the frame. Attached Figure Description

[0017] Figure 1 This is a structural schematic diagram of the present invention from a first-view perspective;

[0018] Figure 2 for Figure 1 A partial schematic diagram;

[0019] Figure 3 This is a structural schematic diagram of the present invention from a second perspective;

[0020] Figure 4 for Figure 3 Enlarged view at point A;

[0021] Figure 5 This is a sectional view of the main view of this utility model;

[0022] Figure 6 for Figure 5 Enlarged view at point B;

[0023] Figure 7 This is a schematic diagram of the structure of the present invention in operation;

[0024] Figure 8 This is a top view of the present invention.

[0025] Reference numerals: 1. Frame; 11. Placement platform; 12. Storage tank; 13. First support; 14. Second support; 15. Third support; 16. Fourth support; 17. Screw; 18. Slide groove; 2. Conveying mechanism; 21. Conveying frame; 22. Belt; 23. Guide rail; 24. Limiting block; 25. Drag chain; 26. Motor; 3. First pushing mechanism; 31. Support plate; 32. Connecting plate; 33. First driver; 34. First push plate; 4. Lifting mechanism; 41. Lifting platform; 42. Second driver; 5. Positioning mechanism; 51. Positioning plate; 52. Third driver; 6. Switching mechanism; 61. Movable plate; 62. Guide groove; 63. Fourth driver; 64. Hinge; 7. Second pushing mechanism; 71. Second push plate; 72. Fifth driver; 8. Clamping piece; 9. Roller; 10. Pulley; 100. First conveyor belt; 200. Second conveyor belt. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1:

[0028] like Figures 1 to 8 As shown, this embodiment discloses a yarn bobbin stacking device, including a frame 1, a lifting mechanism 4 located within the frame 1, and a switching mechanism 6 located on the upper part of the frame 1. The frame 1 has a placement platform 11 on its upper part. The frame 1 includes a storage trough 12 located on the side of the placement platform 11. The upper part of the storage trough 12 has an opening, which is rectangular. The lifting mechanism 4 includes a lifting platform 41 and a second driver 42. The lifting platform 41 is located within the storage trough 12 and is connected to the second driver 42. The lifting platform 41 moves up and down via the second driver 42 to cover the upper opening of the storage trough 12. The second driver 42 is fixedly connected to the frame 1 and is a cylinder fixed to the lower part of the storage trough 12. The telescopic rod of the second driver 42 is inserted into the storage trough 12 and fixed to the lower part of the lifting platform 41. In the initial state, the lifting platform 41 covers the opening, and the upper surface of the lifting platform 41 is not higher than the surface of the placement platform 11. Figure 7 As shown, in this embodiment, after three yarn bobbins are placed side by side on the upper part of the lifting platform 41, the lifting platform 41 descends, so that the three yarn bobbins are located in the storage tank 12.

[0029] like Figure 1As shown, the switching mechanism 6 includes a movable plate 61 and a fourth actuator 63. The movable plate 61 is connected to the fourth actuator 63. The movable plate 61 moves horizontally via the fourth actuator 63 to cover the upper opening of the storage tank 12 or to be misaligned with the upper opening of the storage tank 12. The fourth actuator 63 is a cylinder, preferably a rodless cylinder. The fourth actuator 63 is fixed to the upper part of the frame 1 via a third bracket 15. The movable plate 61 is fixedly connected to the slider of the rodless cylinder. Figure 7 As shown, when the lifting platform 41 lowers the yarn bobbins, the upper surface of the yarn bobbins in the storage trough 12 must be lower than the lower surface of the movable plate 61. In this embodiment, the distance between the two should be controlled within three millimeters to reduce the shaking when the upper yarn bobbins are stacked. When the yarn bobbins located on the upper part of the lifting platform 41 are in the storage trough 12, the fourth driver 63 drives the movable plate 61 to move until the movable plate 61 covers the upper opening of the storage trough 12. At this time, the movable plate 61 is directly above the lifting platform 41, and the placement platform 11 is located... The storage trough 12 is located away from the switching mechanism 6. The upper surface of the movable plate 61 is lower than the surface of the placement platform 11. When three yarn bobbins are placed side by side on the upper part of the movable plate 61, the fourth driver 63 drives the movable plate 61 to quickly reset. At this time, the three yarn bobbins located on the upper part of the movable plate 61 will fall onto the three yarn bobbins located on the upper part of the lifting platform 41, realizing the automatic stacking of two layers of yarn bobbins. After the upper layer of yarn bobbins is stacked on the lower layer of yarn bobbins, the lifting platform 41 rises and resets, so that both layers of yarn bobbins are located on the upper part of the frame 1.

[0030] The upper surface of the movable plate 61 is provided with a guide groove 62. The lower end of the yarn bobbin located on the upper part of the movable plate 61 is inserted into the guide groove 62, thereby achieving the positioning of the yarn bobbin.

[0031] like Figure 6 As shown, the inner walls of both sides of the storage tank 12 are provided with sliding grooves 18 arranged along its length. The movable plate 61 includes a hinge seat 64 located at its lower part and corresponding to the sliding groove 18. A pulley 10 is hinged to the outer side of the hinge seat 64. The sliding groove 18 is sleeved on the outer side of the pulley 10. Rollers 9 are fixed on both sides of the inside of the frame 1 near the storage tank 12. The lower part of the movable plate 61 abuts against the upper part of the roller 9. The roller 9 is rotatably connected to the inner wall of the frame 1. By setting the roller 9 and the pulley 10, not only can the movable plate 61 be guided to move, but the support effect of the movable plate 61 can also be improved, making the movable plate 61 more supportive and its movement smoother.

[0032] like Figure 5As shown, a screw 17 is threadedly connected to the bottom of the storage tank 12. The upper end of the screw 17 is located inside the storage tank 12. The lifting platform 41 moves up and down, abutting or disengaging from the upper end of the screw 17. By rotating the screw 17, the screw 17 can be raised and lowered. By adjusting the height of the screw 17, the lifting distance of the lifting platform 41 can be limited, thereby meeting the needs of stacking two layers of yarn bobbins of different heights.

[0033] like Figures 1 to 4 As shown, it also includes a conveying mechanism 2 and a first pushing mechanism 3. The conveying mechanism 2 is arranged along the length of the frame 1. The first pushing mechanism 3 is located above the frame 1 and is arranged opposite to the switching mechanism 6. The storage tank 12 is located between the first pushing mechanism 3 and the switching mechanism 6. The first pushing mechanism 3 moves horizontally through the conveying mechanism 2 to move closer to or further away from the switching mechanism 6. Specifically, the conveying mechanism 2 in this embodiment is prior art, specifically a screw rotation mechanism. The technology of driving the first pushing mechanism 3 to move horizontally and reciprocally through the screw transmission mechanism is prior art.

[0034] The first pushing mechanism 3 includes a support plate 31, with a first driver 33 fixed to the upper part of the support plate 31 and a first push plate 34 located below the support plate 31. The telescopic rod of the first driver 33 is fixedly connected to the first push plate 34. The support plate 31 is connected to the conveying mechanism 2. The first driver 33 is a cylinder used to drive the first push plate 34 to move up and down. Figure 1 and Figure 8 As shown, the first conveyor belt 100 is an external intermittent conveyor belt used to transport yarn bobbins from right to left to the right side of the placement platform 11. When a yarn bobbin is located on the first conveyor belt 100 near the placement platform 11, the first driver 33 drives the first pusher plate 34 to descend, so that the first pusher plate 34 is located on the side of the yarn bobbin away from the storage tank 12. Then, the conveying mechanism 2 drives the first pushing mechanism 3 to move to the left, and the first pusher plate 34 can quickly push the yarn bobbin past the placement platform 11 and to the upper part of the lifting platform 41 or the movable plate 61 located at the upper opening of the storage tank 12. After the yarn bobbin is in place, the first driver 33 drives the first pusher plate 34 to rise, and the conveying mechanism 2 drives the first pushing mechanism 3 to descend, thereby performing the pushing operation of the next yarn bobbin.

[0035] As shown in the figure, it also includes a positioning mechanism 5 located on the upper part of the frame 1. The positioning mechanism 5 is arranged opposite to the first pushing mechanism 3. The positioning mechanism 5 includes a positioning plate 51 and a third driver 52. The positioning plate 51 is directly opposite the first pushing plate 34. The positioning plate 51 is moved horizontally by the third driver 52 so that it is positioned above the storage tank 12 or misaligned with the upper opening of the storage tank 12. The third driver 52 is a cylinder and is fixed above the frame 1 by a second bracket 14. The switching mechanism 6 is located below the positioning mechanism 5 and does not contact the positioning mechanism 5. Figure 7 As shown, before the first pushing mechanism 3 pushes the yarn bobbin, the third driver 52 drives the positioning plate 51 to move horizontally above the storage tank 12. The first pushing mechanism 3 can push the yarn bobbin located on the far left to the top of the storage tank 12 and make it abut against the side of the positioning plate 51, thereby ensuring that the yarn bobbin is located above the storage tank 12. Both the positioning plate 51 and the first pushing plate 34 are V-shaped, and the outer contour of the yarn bobbin is circular. Through the V-shaped design, the yarn bobbin can be self-positioned when pushing the yarn bobbin.

[0036] like Figure 1 As shown, it also includes a second pushing mechanism 7 located on the upper part of the frame 1. The second pushing mechanism 7 includes a second pushing plate 71 and a fifth driver 72. The second pushing plate 71 moves horizontally via the fifth driver 72 to position itself above the storage tank 12 or offset from the upper opening of the storage tank 12. The moving trajectory of the second pushing plate 71 forms a right angle with the moving trajectory of the movable plate 61. Specifically, the fifth driver 72 is a cylinder and is fixed to the upper part of the frame 1 via a fourth bracket 16. Figure 8 As shown, there is a distance between the second push plate 71 and the positioning plate 51. The height of the second push plate 71 is higher than the height of a yarn bobbin. When the lifting platform 41 rises and resets, so that both layers of yarn bobbins are located on the upper part of the frame 1, the fifth drive 72 can drive the second push plate 71 to move. The second push plate 71 pushes the two layers of yarn bobbins onto the external second conveyor belt 200. The second conveyor belt 200 then transports the two layers of yarn bobbins to the next process.

[0037] Example 2:

[0038] like Figures 1 to 4As shown, the difference between Embodiment 2 and Embodiment 1 is that the conveying mechanism 2 in this embodiment is not a screw drive mechanism. The conveying mechanism 2 in this embodiment includes a conveying frame 21 fixed above the frame 1. The conveying frame 21 is fixedly connected to the upper part of the frame 1 through a first bracket 13. A horizontal conveying belt 22 is installed on the conveying frame 21. The belt 22 is driven by a motor 26. The motor 26 is fixedly connected to the conveying frame 21. The transmission method between the motor 26 and the belt 22 is existing technology. A guide rail 23 is fixed to the side of the conveying frame 21. The support plate 3... 1 is fixedly connected to one side of the belt 22. The support plate 31 is provided with a guide groove (not shown in the figure) adapted to the guide rail 23. The guide rail 23 is embedded in the guide groove. The belt 22 reciprocates horizontally to drive the first pushing mechanism 3 to move horizontally and reciprocally along the guide rail 23. Specifically, the support plate 31 and the belt 22 are fixedly connected by a connecting plate 32 and a clamping piece 8. The vertical section of the connecting plate 32 abuts against the outer side of one side of the belt 22 and the clamping piece 8 abuts against the inner side of the belt 22. The connecting plate 32 and the clamping piece 8 are locked by bolts.

[0039] like Figure 1 As shown, when the motor 26 is working, it drives the belt 22 for transmission. The belt 22 synchronously drives the support plate 31 to move horizontally, thereby driving the first pushing mechanism 3 to move horizontally. Through the transmission of the belt 22, the first pushing mechanism 3 has a faster transmission speed and higher efficiency. Furthermore, the cooperation of the guide groove of the guide rail 23 makes the horizontal movement of the first pushing mechanism 3 more stable. The side of the conveyor frame 21 is also fixed with a limit block 24 by bolts. The distance between the limit block 24 and the first pushing mechanism 3 is less than the length of one side of the belt 22. By setting the limit block 24, the moving distance of the first pushing mechanism 3 can be mechanically limited. In this embodiment, at least two position sensors are also set at the conveyor mechanism 2 to limit the moving distance of the first pushing mechanism 3. The moving distance of the first pushing mechanism 3 can be realized by PLC control. The control principle is ordinary displacement control, which is existing technology.

[0040] Furthermore, the conveying mechanism 2 also includes a drag chain 25 arranged along its length. The drag chain 25 is existing technology. One end of the connecting plate 32 is fixed to the support plate 31 and the other end is fixed to one end of the drag chain 25. The other end of the drag chain 25 is fixed to the conveying frame 21. By setting the drag chain 25, the stability of the movement of the first pushing mechanism 3 can be further improved.

[0041] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A yarn bobbin stacking device, characterized in that, The device includes a frame (1), a lifting mechanism (4) located within the frame (1), and a switching mechanism (6) located on the upper part of the frame (1). The frame (1) includes a storage tank (12) with an opening at the top. The lifting mechanism (4) includes a lifting platform (41) and a second driver (42). The lifting platform (41) is located within the storage tank (12) and is connected to the second driver (42). The lifting platform (41) moves up and down via the second driver (42) to cover the opening at the top of the storage tank (12). The second driver (42) is fixedly connected to the frame (1). The switching mechanism (6) includes a movable plate (61) and a fourth driver (63). The movable plate (61) is connected to the fourth driver (63). The movable plate (61) moves horizontally via the fourth driver (63) to cover the opening at the top of the storage tank (12) or to be misaligned with the opening at the top of the storage tank (12).

2. The yarn bobbin stacking device according to claim 1, characterized in that, It also includes a conveying mechanism (2) and a first pushing mechanism (3). The conveying mechanism (2) is arranged along the length of the frame (1). The first pushing mechanism (3) is located above the frame (1) and is arranged opposite to the switching mechanism (6). The storage tank (12) is located between the first pushing mechanism (3) and the switching mechanism (6). The first pushing mechanism (3) moves horizontally through the conveying mechanism (2) to move closer to or away from the switching mechanism (6).

3. The yarn bobbin stacking device according to claim 2, characterized in that, The first pushing mechanism (3) includes a support plate (31), a first driver (33) is fixed on the upper part of the support plate (31), and a first push plate (34) is provided below the support plate (31). The telescopic rod of the first driver (33) is fixedly connected to the first push plate (34).

4. A yarn bobbin stacking device according to claim 3, characterized in that, It also includes a positioning mechanism (5) located on the upper part of the frame (1). The positioning mechanism (5) is arranged opposite to the first pushing mechanism (3). The positioning mechanism (5) includes a positioning plate (51) and a third driver (52). The positioning plate (51) is directly opposite the first pushing plate (34). The positioning plate (51) is moved horizontally by the third driver (52) so that it is positioned above the storage tank (12) or misaligned with the upper opening of the storage tank (12).

5. A yarn bobbin stacking device according to claim 3, characterized in that, It also includes a second pushing mechanism (7) located on the upper part of the frame (1). The second pushing mechanism (7) includes a second push plate (71) and a fifth driver (72). The second push plate (71) moves horizontally by the fifth driver (72) so that it is located above the storage tank (12) or misaligned with the upper opening of the storage tank (12). The moving trajectory of the second push plate (71) and the moving trajectory of the movable plate (61) are at right angles.

6. A yarn bobbin stacking device according to claim 1, characterized in that, The frame (1) is provided with a placement platform (11) on the upper part, and the placement platform (11) is located on the side of the storage tank (12) away from the switching mechanism (6).

7. A yarn bobbin stacking device according to claim 1, characterized in that, The bottom of the storage tank (12) is threaded with a screw (17), the upper end of the screw (17) is located inside the storage tank (12), and the lifting platform (41) moves up and down to abut or disengage from the upper end of the screw (17).

8. A yarn bobbin stacking device according to claim 3, characterized in that, The conveying mechanism (2) includes a conveying frame (21) fixed above the frame (1), a horizontal conveying belt (22) is installed on the conveying frame (21), a guide rail (23) is fixed on the side of the conveying frame (21), a support plate (31) is fixedly connected to one side of the belt (22), a guide groove adapted to the guide rail (23) is provided in the support plate (31), the guide rail (23) is embedded in the guide groove, and the belt (22) reciprocates horizontally to drive the first pushing mechanism (3) to move horizontally along the guide rail (23).

9. A yarn bobbin stacking device according to claim 8, characterized in that, The support plate (31) and the belt (22) are fixedly connected by a connecting plate (32) and a clamp (8). The vertical section of the connecting plate (32) abuts against the outer side of one side of the belt (22) and the clamp (8) abuts against the inner side of the belt (22). The connecting plate (32) and the clamp (8) are locked together by bolts. The conveying mechanism (2) also includes a drag chain (25) arranged along its length. One end of the connecting plate (32) is fixed to the support plate (31) and the other end is fixed to one end of the drag chain (25). The other end of the drag chain (25) is fixed to the conveyor frame (21).

10. A yarn bobbin stacking device according to claim 3, characterized in that, The storage tank (12) has sliding grooves (18) on both sides of its inner wall, which are arranged along its length. The movable plate (61) includes a hinge seat (64) located at its lower part and corresponding to the sliding groove (18). A pulley (10) is hinged to the outside of the hinge seat (64). The sliding groove (18) is sleeved on the outside of the pulley (10). Rollers (9) are fixed on both sides of the inside of the frame (1) near the storage tank (12). The lower part of the movable plate (61) abuts against the upper part of the roller (9). The frame (1) further includes a first support (13), a second support (14), a third support (15) and a fourth support (16). The first support (13) is fixedly connected to the conveying mechanism (2), the second support (14) is fixedly connected to the positioning mechanism (5), the third support (15) is fixedly connected to the switching mechanism (6), and the fourth support (16) is fixedly connected to the second pushing mechanism (7). The first driver (33), the second driver (42), the third driver (52), the fourth driver (63) and the fifth driver (72) are all cylinders.

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