Carriage tilt correction device for vertical loopers

Abstract

To correct the inclination of a carriage in a vertical looper in which metal strips are caused to travel by their being successively stretched over a plurality of looper rollers provided on the carriage and over a plurality of fixed rollers provided at a lower position corresponding to the looper rollers.SOLUTION: A carriage inclination correcting device in a vertical looper includes a length adjustment device 17 that adjusts a length of a chain 12a1, 12a2, 12b1, 12b2 from which an end part of a carriage 10 provided with a looper roller 11 is suspended. The carriage is moved in a vertical direction from a horizontal state, an amount Y of vertical movement of the carriage and an amount X of inclination of the carriage after the movement are obtained, and a ratio of the amount of inclination to the amount of vertical movement is calculated. When the carriage is vertically moved, the length of the chain is adjusted by the length adjustment device so that the carriage becomes horizontal, based on the ratio of the amount of inclination to the amount of vertical movement.SELECTED DRAWING: Figure 7

Description

[[Technical Field]]

[0001] The present invention relates to a carriage inclination correcting device for a vertical looper, which corrects inclination of a carriage caused by difference in elongation of chains suspending the carriage when a metal strip such as a steel strip is sequentially wound around a plurality of looper rollers provided on the carriage of the vertical looper and a plurality of fixed rollers provided at lower positions corresponding to the looper rollers, and is caused to travel. [[Background Art]]

[0002] Conventionally, when performing continuous treatment such as continuous annealing on a metal strip such as a steel strip, as disclosed in Patent Documents 1 to 4, in order to cope with fluctuations in the conveying speed of the metal strip and connection of metal strips, a plurality of looper rollers are provided on a carriage provided to be liftable in a vertical looper, and a plurality of fixed rollers are provided at lower positions corresponding to said looper rollers, a metal strip such as a steel strip is sequentially wound around said looper rollers and fixed rollers to travel, and if necessary, said carriage is lowered to reduce the distance between the looper rollers provided on the carriage and the fixed rollers.

[0003] When the carriage is provided to be liftable as described above, in those disclosed in Patent Documents 1 and 2, both axial sides of the looper rollers on the carriage provided with the looper rollers are suspended by chains or wires, and the chains or wires suspending the carriage are used by sprockets or winding drums to lift and lower the suspended carriage up and down.

[0004] Here, as described above, when a carriage equipped with looper rollers is suspended by chains or wires on both axial sides of the looper rollers and work continues for a period of time, the chains or wires suspending the carriage gradually stretch due to the weight of the carriage and the tension of the metal strip. In particular, as shown in Patent Document 2, if the lengths of the chains or wires suspending the carriage differ on both axial sides of the looper rollers, the longer chain or wire stretches more, causing the carriage to tilt. When the metal strip is passed sequentially between the looper rollers and fixed rollers and driven through, the metal stop may meander or vibration may occur, making operation difficult and potentially damaging the metal strip.

[0005] Therefore, in the devices described in Patent Documents 1 to 4, laser sensors, inclinometers, displacement sensors, etc., were used to measure the distance from the floor to the carriage and the inclination angle of the carriage's upper surface, and these results were fed back to adjust the horizontal position of the carriage in real time by extending or retracting electric jacks, etc.

[0006] However, using electronic devices such as laser sensors presented problems such as the inability to adjust the carriage to a horizontal position due to the influence of the factory's operating environment and equipment vibrations, as well as the need for complex control and expensive sensors, resulting in high costs. [Prior art documents] [Patent Documents]

[0007] [Patent Document 1] Japanese Patent Publication No. 2012-223771 [Patent Document 2] Japanese Patent Application Publication No. 4-339520 [Patent Document 3] Patent No. 6814323 [Patent Document 4] Japanese Patent Application Publication No. 8-267139 [Disclosure of the Invention] [Problems that the invention aims to solve]

[0008] The present invention aims to solve the aforementioned problems when adjusting the horizontal position of a carriage in a vertical looper, where a metal strip is sequentially passed over multiple looper rollers provided on the carriage and multiple fixed rollers provided below corresponding to the looper rollers, and then driven through the carriage for processing.

[0009] In particular, the present invention aims to easily correct the tilt of a carriage caused by differences in the elongation of the chains suspending the carriage when the axial sides of the looper rollers in a carriage equipped with looper rollers are suspended by a chain, and the chains suspending the carriage are driven by a sprocket to raise and lower the carriage. [Means for solving the problem]

[0010] In the carriage tilt correction device for a vertical looper according to the present invention, in order to solve the above-mentioned problems, a metal strip is sequentially stretched over a plurality of looper rollers provided on the carriage and a plurality of fixed rollers provided at a lower position corresponding to the looper rollers and is driven along it, at least four ends on both sides in the longitudinal direction perpendicular to the axial direction on both sides of the looper rollers on the carriage where the looper rollers are provided are suspended by a chain, and the carriage is raised and lowered by driving the chain from which the carriage is suspended in this manner with a sprocket, in the carriage tilt correction device for a vertical looper, at least one side in the axial direction of the looper rollers on the carriage and the ends on both sides in the longitudinal direction A length adjustment device is provided to adjust the length of the chain from which the section is suspended. The length adjustment device adjusts the carriage, which is tilted due to the difference in the elongation of the chains provided on both sides of the looper roller in the axial direction, to a horizontal state. In this state, the sprocket drives each chain to move the carriage up and down. The amount of vertical movement of the carriage and the amount of inclination of the carriage after the movement are determined, and the ratio of the amount of inclination to the amount of vertical movement is calculated. When moving the carriage, which is in a horizontal state, up and down, the length adjustment device adjusts the length of the chain on at least one side of the looper roller in the axial direction so that the carriage becomes horizontal, based on the ratio of the amount of inclination to the amount of vertical movement.

[0011] Furthermore, as with the carriage tilt correction device in the vertical looper according to the present invention, a difference in the elongation of the chains provided on both sides of the looper roller in the axial direction causes the carriage to tilt. After adjusting the tilted carriage to a horizontal state using a length adjustment device, the chains are driven by a sprocket to move the carriage vertically. The amount of vertical movement of the carriage and the amount of tilt of the carriage after the movement are determined, and the ratio of the amount of tilt to the amount of vertical movement is calculated. When moving the horizontal carriage vertically, the length of the chain on at least one side of the looper roller in the axial direction is adjusted using the length adjustment device based on the ratio of the amount of tilt to the amount of vertical movement so that the carriage becomes horizontal. This allows the carriage to be moved horizontally in a simpler and lower-cost manner compared to conventional methods that use laser sensors, inclinometers, or displacement sensors to measure the distance from the floor to the carriage and the tilt angle of the carriage's upper surface, and then use these results to adjust the carriage's horizontal state by extending or retracting an electric jack in real time.

[0012] In the carriage tilt correction device for a vertical looper according to the present invention, an adjustment bolt that is raised and lowered by an electric jack is used as the length adjustment device on the carriage, and one end of the chain can be attached to the adjustment bolt. Then, the length of the adjustment bolt that is raised and lowered by the electric jack is adjusted based on the ratio of the amount of tilt to the amount of vertical movement, so that the carriage moves vertically while remaining horizontal.

[0013] Furthermore, in the carriage tilt correction device for a vertical looper according to the present invention, the carriage tilted due to the difference in the elongation of the chains provided on both sides of the looper roller in the axial direction is adjusted to a horizontal state by the length adjustment device, and in this state, each chain is driven by the sprocket to move the carriage upward, and the amount of upward movement of the carriage and the amount of tilt of the carriage after the movement are determined, and the ratio of the amount of tilt to the amount of upward movement is calculated, and when moving the carriage in the horizontal state in the vertical direction, the length adjustment device can be used to adjust the length of the chain on at least one side in the axial direction of the looper roller so that the carriage becomes horizontal based on the ratio of the amount of tilt to the amount of upward movement.

[0014] Furthermore, in the carriage tilt correction device for a vertical looper according to the present invention, the amount of tilt can be determined by the difference between the position of the carriage end on one axial end side of the looper roller and the position of the carriage end on the other axial end side of the looper roller. In this way, the ratio of the amount of tilt to the amount of vertical movement of the carriage can be easily calculated. [Effects of the Invention]

[0015] In the carriage tilt correction device for a vertical looper according to the present invention, the carriage, which has tilted due to a difference in the elongation of the chains provided on both sides of the looper roller in the axial direction as described above, is adjusted to a horizontal state by the length adjustment device. Then, the chain is driven by a sprocket to move the carriage in the vertical direction, and the amount of vertical movement of the carriage and the amount of tilt of the carriage after the movement are determined. The ratio of the amount of tilt to the amount of vertical movement is calculated, and when moving the carriage in the horizontal state in the vertical direction, the length of the chain on at least one side in the axial direction of the looper roller is adjusted by the length adjustment device based on the ratio of the amount of tilt to the amount of vertical movement so that the carriage is always horizontal. As a result, the carriage can be moved in a horizontal state more easily and at lower cost than conventional devices. [Brief explanation of the drawing]

[0016] [Figure 1] This is a schematic front view showing a carriage tilt correction device for a vertical looper according to one embodiment of the present invention, in which a metal strip is sequentially stretched over a plurality of looper rollers provided on the carriage and a plurality of fixed rollers provided at a lower position corresponding to the looper rollers, and the carriage on which the looper rollers are provided is suspended by a chain, and the chain is driven by a rotating sprocket to raise and lower the carriage. [Figure 2] This is a schematic perspective view showing the carriage tilt correction device in the vertical looper according to the above embodiment, in which a carriage equipped with multiple looper rollers is suspended by a chain, and the carriage is raised and lowered by driving the chain with a rotating sprocket. [Figure 3] The diagram shows a schematic side view of the carriage tilt correction device in the vertical looper according to the above embodiment, in which a motor rotates each sprocket provided on the other axial end of the looper roller, winding up each chain and raising the carriage to the upper position. [Figure 4]In the carriage inclination correction device for a vertical looper according to the above embodiment, it is a schematic side view showing a state where each sprocket provided on the other axial end side of the looper roller is rotationally driven to rewind each chain and lower the carriage to a lower position. [Figure 5] In the carriage inclination correction device for a vertical looper according to the above embodiment, it is a schematic side view showing a state where the elongation of the chain attached to one axial end side of the looper roller is larger than that of the chain attached to the other axial end side of the looper roller, so that the end of the carriage on the one axial end side of the looper roller is at a lower position than the end of the carriage on the other axial end side of the looper roller, and the carriage is inclined. [Figure 6] In the carriage inclination correction device for a vertical looper according to the above embodiment, it is a schematic side view showing a state where when the carriage is inclined as shown in FIG. 5, the protruding length of the adjustment bolt is adjusted by the electric jack provided on one axial end side of the looper roller, so that the carriage is brought into a horizontal state. [Figure 7] In the carriage inclination correction device for a vertical looper according to the above embodiment, when the carriage is moved upward after being adjusted to a horizontal state as shown in FIG. 6, it shows a state where the end of the carriage on one axial end side of the looper roller is higher than the end of the carriage on the other axial end side of the looper roller, and it is a schematic side view showing a state where the movement amount for moving the carriage upward and the inclination amount of the carriage after movement are obtained to calculate the ratio of the inclination amount to the vertical movement amount. [Figure 8] In the carriage inclination correction device for a vertical looper according to the above embodiment, it is a schematic side view showing a state where after the carriage is adjusted to a horizontal state as shown in FIG. 6, the carriage is moved upward using the present invention. [Figure 9] It is a detailed drawing for explaining the tooth pitch of the sprocket and the pitch of the chain links. BEST MODE FOR CARRYING OUT THE INVENTION

[0017] Hereinafter, a carriage inclination correcting device in a vertical looper according to an embodiment of the present invention will be specifically described with reference to the accompanying drawings. Note that the carriage inclination correcting device in a vertical looper according to the present invention is not limited to those shown in the following embodiments, and can be appropriately modified and implemented without changing the gist of the invention.

[0018] In the vertical looper P used in this embodiment, as shown in FIG. 1 and FIG. 2, a metal strip S is sequentially wound around a plurality of looper rollers 11 provided on a carriage 10 and a plurality of fixed rollers 21 provided at lower positions corresponding to the looper rollers 11, so that the metal strip S travels.

[0019] Here, in the carriage 10 provided with the looper rollers 11 as described above, chains 12a1, 12a2, 12b1, 12b2 are respectively attached to ends on both sides in the longitudinal direction orthogonal to the axial direction of the looper rollers 11 on both sides in the axial direction, so that the carriage 10 is suspended. The chains 12a1, 12a2 attached to ends on both sides in the longitudinal direction orthogonal to the axial direction at one axial end side of the looper rollers 11 are respectively wound from sprockets 13a1, 13a2 provided above the ends on both sides in the longitudinal direction orthogonal to the axial direction at the one axial end side of the looper rollers 11 onto sprockets 13a3, 13a4 provided above the ends on both sides in the longitudinal direction orthogonal to the axial direction at the other axial end side of the looper rollers 11. Meanwhile, the chains 12b1, 12b2 attached to ends on both sides in the longitudinal direction orthogonal to the axial direction at the other axial end side of the looper rollers 11 are respectively wound around sprockets 13b1, 13b2 provided above the ends on both sides in the longitudinal direction orthogonal to the axial direction at the other axial end side of the looper rollers 11. Ends of the chains 12a1, 12a2, 12b1, 12b2 are attached to a weight 14, so that the carriage 10 is suspended and held by the chains 12a1, 12a2, 12b1, 12b2.

[0020] Then, the motor 15 rotates the sprockets 13a3, 13a4, 13b1, and 13b2, which are provided at the upper part of both ends in the longitudinal direction perpendicular to the axial direction on the other axial end of the looper roller 11. As shown in Figure 3, the rotating sprockets 13a1, 13a2, 13a3, 13a4, 13b1, and 13b2 wind up the chains 12a1, 12a2, 12b1, and 12b2, raising the carriage 10 to the upper position. On the other hand, as shown in Figure 4, the sprockets 13a3, 13a4, 13b1, and 13b2 are rotated in the opposite direction, and the rotating sprockets 13a1, 13a2, 13a3, 13a4, 13b1, and 13b2 unwind the chains 12a1, 12a2, 12b1, and 12b2, lowering the carriage 10 to the lower position.

[0021] Here, as described above, the metal strip S is sequentially stretched over the multiple looper rollers 11 provided on the carriage 10 and the multiple fixed rollers 21 provided at a lower position corresponding to the looper rollers 11, and when the metal strip S is run, stretching occurs in each chain 12a1, 12a2, 12b1, and 12b2 over time.

[0022] In that case, the total length of the chains 12a1, 12a2 that are connected to the adjustment bolt 17b of the electric jack 17a of the carriage 10, and that follow a path from sprockets 13a1, 13a2 provided on the upper part of both ends in the longitudinal direction perpendicular to the axial direction on one axial end of the looper roller 11, to sprockets 13a3, 13a4 provided on the upper part of both ends in the longitudinal direction perpendicular to the axial direction on the other axial end of the looper roller 11, and that connect to the upper end of the weight 14, is longer than the total length of the chains 12b1, 12b2 that are connected to the mounting bolt 17c of the carriage 10, and that follow a path that follows a path that is wrapped around sprockets 13b1, 13b2 provided on the upper part of both ends in the longitudinal direction perpendicular to the axial direction on the other axial end of the looper roller 11, and that connect to the upper end of the weight 14. Therefore, if each chain 12a1, 12a2, 12b1, and 12b2 elongates over time, the overall elongation (length) of the longer chain 12a1 and 12a2 will be greater than the overall elongation (length) of the shorter chain 12a1 and 12a2.

[0023] Therefore, when the carriage 10 is lowered while the elongation of the chains 12a1 and 12a2 attached to both ends in the longitudinal direction perpendicular to the axial direction at one axial end of the looper roller 11 is greater than that of the chains 12b1 and 12b2 attached to both ends in the longitudinal direction perpendicular to the axial direction at the other axial end of the looper roller 11, as shown in Figure 5, the end of the carriage 10 at the axial end of the looper roller 11 to which the chains 12a1 and 12a2 are attached is lower than the end of the carriage 10 at the other axial end of the looper roller 11 to which the chains 12b1 and 12b2 are attached, and the carriage 10 is inclined downward from the other end to the one end.

[0024] In order to adjust the tilted carriage 10 to a horizontal position using the length adjustment device 17, in this embodiment, adjustment bolts 17b are provided on both sides in the longitudinal direction perpendicular to the axial direction at one axial end of the looper roller 11 on the carriage 10 on which the looper roller 11 is provided, and the chains 12a1 and 12a2 at both ends in the longitudinal direction perpendicular to the axial direction at one axial end of the looper roller 11 are attached to the adjustment bolts 17b, respectively. On the other end of the looper roller 11 on the carriage 10 on which the looper roller 11 is provided, mounting bolts 17c are provided on both sides in the longitudinal direction perpendicular to the axial direction at the other axial end of the looper roller 11 on which the looper roller 11 is provided, and the chains 12b1 and 12b2 at both ends in the longitudinal direction perpendicular to the axial direction at the other axial end of the looper roller 11 are attached to the mounting bolts 17c, respectively.

[0025] Here, when the length to which the adjustment bolt 17b protrudes upward by the electric jack 17a is increased, one axial end of the looper roller 11 on the carriage 10 moves downward, while when the length to which the adjustment bolt 17b protrudes upward is decreased, one axial end of the looper roller 11 on the carriage 10 moves upward.

[0026] Then, as shown in Figure 5, if the end of the carriage 10 on one axial end of the looper roller 11 to which the chains 12a1 and 12a2 are attached is lower than the end of the carriage 10 on the other axial end of the looper roller 11 to which the chains 12b1 and 12b2 are attached, causing the carriage 10 to be tilted downward from the other end to the one end, then, as shown in Figure 6, the length to which the adjustment bolt 17b protrudes upward is shortened by the electric jack 17a (see A in the figure), and the axial end of the looper roller 11 on the carriage 10 is moved upward to adjust the carriage 10 so that it is horizontal.

[0027] In this mechanism, chains 12b1 and 12b2 are bent only once by sprockets 13b1 and 13b2, while chains 12a1 and 12a2 are bent twice by sprockets 13a1, 13a2, 13a3, and 13a4. Therefore, it was found that the elongation of chains 12a1 and 12a2 is greater than that of chains 12b1 and 12b2 due to frictional heat generated by the bending and straightening.

[0028] As shown in Figure 9, the links 42 of the chain 41 mesh with the teeth 44 of the sprocket 43 to drive the chain. There is dimensional clearance between the pitch L1 of the chain links and the pitch L2 of the sprocket teeth, so even if the pitch of the chain links increases (stretches) by a small amount, it can still mesh with the teeth of the sprocket and drive the chain.

[0029] In that state, after adjusting the carriage 10 to a horizontal position as described above, the motor 15 rotates each sprocket 13a1, 13a2, 13a3, 13a4, 13b1, 13b2 to move the carriage 10 upward. As shown in Figure 7, even if the same number of teeth are fed by the sprockets 13a1, 13a2, 13a3, 13a4, 13b1, 13b2, the ends on both sides in the longitudinal direction perpendicular to the axial direction at one end of the looper roller 11 are attached. Because the pitch elongation of the attached chains 12a1 and 12a2 is greater than the pitch elongation of the chains 12b1 and 12b2 attached to the other axial end of the looper roller 11, the winding amount increases, and the end of the carriage 10 on the axial end of the looper roller 11 to which chains 12a1 and 12a2 are attached becomes higher than the end of the carriage 10 on the other axial end of the looper roller 11 to which chains 12b1 and 12b2 are attached, causing the carriage 10 to tilt upward from the other end to the one end.

[0030] Therefore, in this embodiment, as shown in Figure 7, when the carriage 10 is moved upward, the amount of vertical movement Y of the carriage 10 and the amount of inclination X of the carriage 10 after the movement are determined by finding the difference between the position of the end of the carriage 10 on one axial end of the looper roller 11 and the position of the end of the carriage 10 on the other axial end of the looper roller 11, and the ratio of the amount of inclination X to the amount of vertical movement Y (X / Y) is calculated, and this calculated ratio of the amount of vertical movement Y to the amount of inclination X (X / Y) is input to the control device 30. Any method can be used to measure the amount of inclination X.

[0031] In this embodiment, after adjusting the carriage 10 to a horizontal position as described above, the motor 15 rotates each sprocket 13a1, 13a2, 13a3, 13a4, 13b1, and 13b2 to move the carriage 10 in the vertical direction, and based on the ratio of the amount of inclination X to the amount of vertical movement Y (X / Y) calculated as described above, the control device 30 adjusts the length of the adjustment bolt 17b that protrudes from the electric jack 17a so that the carriage 10 moves in the vertical direction while remaining horizontal.

[0032] In short, as the carriage 10 rises from the state in Figure 6 (lowered end) to the state in Figure 8 (upper end), the length of the adjustment bolt 17b protruding upward is gradually increased in proportion to the height of the carriage 10.

[0033] Specifically, when raised to its upper limit, the upward protrusion length of the adjustment bolt 17b is as shown by B in Figure 8, which is longer by dimension X than the state shown by A in Figure 6.

[0034] As a result, the carriage tilt correction device in the vertical looper P according to this embodiment only requires the operation of proportionally changing the length of the adjustment bolt 17b of the electric jack 17a as the carriage 10 moves up and down between the upper end and the lower end, and does not require complex real-time fine adjustments using sensors as in the past. Therefore, the carriage 10 can be moved vertically while maintaining a horizontal position in a simple and low-cost manner.

[0035] For convenience, this explanation describes correcting the tilt of carriage 10 by raising or lowering it only once. However, in reality, it takes a long time for the effects of chain stretching to become apparent, so it is not necessary to do this every time. It is sufficient to do it after each of the multiple raising and lowering cycles of carriage 10.

[0036] In this example, the horizontal position was adjusted by raising the carriage 10 and reducing the length of its protrusion above the adjustment bolt 17b. However, the horizontal position could also be adjusted by lowering the carriage 10 in the same manner, or by increasing the length of its protrusion above the adjustment bolt 17b. [Explanation of Symbols]

[0037] 10: Carriage 11: Looper Roller 12a1: Chain 12a2: Chain 12b1: Chain 12b2: Chain 13a1: Sprocket 13a2: Sprocket 13a3: Sprocket 13a4: Sprocket 13b1: Sprocket 13b2: Sprocket 14: Weight 15: Motor 17: Length adjustment device 17a: Electric jack 17b: Adjustment bolt 17c: Mounting bolts 21: Fixed roller 30: Control device 40: Sprocket 41: Chain 42: Link 43: Sprocket 44: Teeth A: Protrusion length of the adjustment bolt B: Protrusion length of the adjustment bolt L1: Pitch of chain links L2: Sprocket tooth pitch P: Vertical louver S: Metal strip X: Amount of slope Y: Distance

Claims

1. In a carriage tilt correction device for a vertical looper, a metal strip is sequentially stretched over a plurality of looper rollers provided on a carriage and a plurality of fixed rollers provided below corresponding to the looper rollers and driven along them, at least four ends on both sides in the longitudinal direction perpendicular to the axial direction on both sides of the looper rollers on the carriage where the looper rollers are provided are suspended by chains, and the carriage is raised and lowered by driving the chains that suspend the carriage in this manner with a sprocket, the carriage tilt correction device is provided to adjust the length of the chains that suspend the ends on both sides in the longitudinal direction on at least one side in the axial direction of the looper rollers on the carriage, and the loop A carriage tilt correction device for a vertical looper, characterized in that the carriage tilted due to the difference in the elongation of the chains provided on both sides of the looper roller in the axial direction is adjusted to a horizontal state by the length adjustment device, each chain is driven by the sprocket to move the carriage vertically, the amount of vertical movement of the carriage and the amount of tilt of the carriage after the movement are determined, the ratio of the amount of tilt to the amount of vertical movement is calculated, and when moving the horizontal carriage vertically, the length of the chain on at least one side of the looper roller in the axial direction is adjusted by the length adjustment device so that the carriage becomes horizontal based on the ratio of the amount of tilt to the amount of vertical movement.

2. A carriage tilt correction device for a vertical louver according to claim 1, characterized in that, as the length adjustment device, an adjustment bolt that is raised and lowered by an electric jack is used on the carriage, and one end of the chain is attached to the adjustment bolt.

3. A carriage tilt correction device for a vertical looper according to claim 1, characterized in that the carriage tilted due to the difference in the elongation of the chains provided on both sides of the looper roller in the axial direction is adjusted to a horizontal state by the length adjustment device, in this state the chains are driven by the sprocket to move the carriage upward, the amount of upward movement of the carriage and the amount of tilt of the carriage after the movement are determined, the ratio of the amount of tilt to the amount of upward movement is calculated, and when moving the carriage in the horizontal state in the vertical direction the length adjustment device adjusts the length of the chain on at least one side of the looper roller in the axial direction so that the carriage becomes horizontal based on the ratio of the amount of tilt to the amount of upward movement.

4. A carriage tilt correction device for a vertical looper according to any one of claims 1 to 3, characterized in that the amount of tilt is determined by finding the difference between the position of the end of the carriage on one axial side of the looper roller and the position of the end of the carriage on the opposite axial side of the looper roller.

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