Carriage inclination correcting device in vertical looper

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 tilt correction device for a vertical looper, which corrects the tilt of the carriage caused by a difference in the elongation of the chain suspending the carriage when a metal strip such as a steel band is passed over and run between multiple looper rollers attached to the carriage of the vertical looper and multiple fixed rollers attached below the looper rollers in sequence. [Background technology]

[0002] Conventionally, when performing continuous processing such as continuous annealing on a metal strip such as a steel strip, in order to deal with fluctuations in the conveying speed of the metal strip and to deal with the connection of the metal strip, as shown in Patent Documents 1 to 4, a vertical looper has been provided with multiple looper rollers on a carriage that can be raised and lowered, and multiple fixed rollers are provided at positions below the looper rollers so as to correspond to the looper rollers, and the metal strip such as a steel strip is run by being passed over the looper rollers and fixed rollers in turn, and if necessary, the carriage is lowered to shorten the distance between the looper rollers and fixed rollers provided on the carriage.

[0003] In order to mount the looper roller on a carriage so that it can be raised and lowered as described above, the looper roller is suspended on both axial sides of the carriage on which it is mounted by a chain or wire, and the chain or wire suspending the carriage in this manner is used by a sprocket or winding drum to raise and lower the suspended carriage.

[0004] Here, as described above, when a carriage equipped with a looper roller is suspended by a chain or wire on both axial sides of the looper roller and operation continues for a period of time, the chain or wire suspending the carriage gradually stretches due to the carriage's own weight and the tension of the metal strip. In particular, as shown in Patent Document 2, if the lengths of the chain or wire suspending the carriage are different on both axial sides of the looper roller, the longer suspending chain or wire will stretch more and the carriage will tilt. As a result, when the metal strip is passed over the looper roller and fixed roller in turn and made to run, the metal stop will meander or vibrate, making operation difficult or damaging the metal strip.

[0005] For this reason, in the devices shown in Patent Documents 1 to 4, laser sensors, inclinometers, displacement sensors, etc. are used to measure the distance from the floor to the carriage and the inclination angle of the top surface of the carriage, and these results are fed back to extend and retract electric jacks, etc. in real time to adjust the horizontal state of the carriage.

[0006] However, using electronic devices such as laser sensors can be affected by the factory environment and vibrations in the equipment, making it impossible to adjust the carriage to a horizontal position. In addition, complex controls and expensive sensors are required, resulting in high costs. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Laid-Open 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 [Problem to be solved by the invention]

[0008] The present invention aims to solve the above-mentioned problems that arise when adjusting the horizontal state of a carriage in a vertical looper in which a metal strip is passed over and processed by passing it between multiple looper rollers mounted on the carriage and multiple fixed rollers mounted below the looper rollers.

[0009] In particular, the present invention aims to provide a mechanism for easily correcting tilting of the carriage caused by a difference in stretch of the chain suspending the carriage when both axial sides of the looper roller on which the looper roller is mounted are suspended by a "chain" and the chain suspending the carriage is driven by a sprocket to raise and lower the carriage. [Means for solving the problem]

[0010] In order to solve the above-mentioned problems, the tilt correction device for a carriage in a vertical looper according to the present invention has a metal strip that is wound around a plurality of looper rollers provided on a carriage and a plurality of fixed rollers provided at positions below the looper rollers in order to run the metal strip, and at least four ends of the metal strip on both sides of the axial direction of the looper roller on the carriage on which the looper roller is provided, on both sides of the longitudinal direction perpendicular to the axial direction, are suspended by chains, and the chain suspending the carriage is driven by a sprocket to raise and lower the carriage. a length adjusting device for adjusting the length of the chain from which the looper roller is suspended, and the carriage, which has been tilted due to the difference in elongation of the chains provided on both sides of the axial direction of the looper roller, is adjusted to a horizontal state by the length adjusting device; in this state, the chains are driven by the sprockets to move the carriage in the vertical direction, and the amount of vertical movement of the carriage and the amount of inclination of the carriage after movement are determined, and the ratio of the amount of inclination to the amount of movement in the vertical direction is calculated; and when the carriage, which is in a horizontal state, is moved in the vertical direction, the length adjusting device adjusts the length of the chain on at least one side of the axial direction of the looper roller based on the ratio of the amount of inclination to the amount of movement in the vertical direction so that the carriage is horizontal.

[0011] In the case of the carriage tilt correction device for a vertical looper according to the present invention, a carriage that has tilted due to a difference in the elongation of the chains on both sides of the axial direction of the looper roller is adjusted to a horizontal state using a length adjustment device, and then the chain is driven by a sprocket to move the carriage up and down, 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 the carriage, which is in a horizontal state, is moved up and down, the length adjustment device adjusts the length of the chain on at least one side of the axial direction of the looper roller based on the ratio of the amount of tilt to the amount of vertical movement so that the carriage is horizontal. This makes it possible to move the carriage in a horizontal state more simply and at lower cost than conventional methods that use a laser sensor, inclinometer, displacement sensor, etc. to measure the distance from the floor to the carriage and the tilt angle of the top surface of the carriage, and then use these results to adjust the horizontal state of the carriage by extending or retracting an electric jack, etc. in real time.

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

[0013] In addition, in the carriage tilt correction device for a vertical looper according to the present invention, the carriage, which has tilted due to the difference in elongation of the chains on both sides of the axial direction of the looper roller, 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, the amount of upward movement of the carriage and the amount of tilt of the carriage after movement are determined, and the ratio of the amount of tilt to the amount of upward movement is calculated, and when the carriage, which is in a horizontal state, is moved up and down, the length adjustment device can adjust the length of the chain on at least one side of the axial direction of the looper roller based on the ratio of the amount of tilt to the amount of upward movement so that the carriage is horizontal.

[0014] In addition, in the device for correcting the inclination of a carriage in a vertical looper according to the present invention, the amount of inclination can be calculated by determining the difference between the position of the end of the carriage at one axial end of the looper roller and the position of the end of the carriage at the other axial end of the looper roller. In this way, it is possible to easily calculate the ratio of the amount of inclination to the amount of movement of the carriage in the up and down direction. [Effects of the Invention]

[0015] In the carriage tilt correction device for a vertical looper of the present invention, the carriage, which has become tilted due to a difference in the elongation of the chains on both sides of the axial direction of the looper roller as described above, is adjusted to a horizontal state using a length adjustment device, and then the chain is driven by a sprocket to move the carriage up and down, the amount of vertical movement of the carriage and the amount of tilt of the carriage after movement are determined, and the ratio of the amount of tilt 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 axial direction of the looper roller based on the ratio of the amount of tilt to the amount of vertical movement so that the carriage is always horizontal.This makes it possible to move the carriage in a horizontal state more simply and at lower cost than conventional devices. [Brief explanation of the drawings]

[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 passed over and run between multiple looper rollers provided on the carriage and multiple fixed rollers provided at positions below the looper rollers, and the carriage on which the looper rollers are provided is suspended by a chain, which is driven by a rotating sprocket to raise and lower the carriage. [Figure 2] This is a schematic oblique view showing the carriage equipped with multiple looper rollers suspended by a chain in the carriage tilt correction device for a vertical looper according to the embodiment, and the chain is driven by a rotating sprocket to raise and lower the carriage. [Figure 3] This is a schematic side view showing the state in which, in the carriage tilt correction device for a vertical looper according to the embodiment described above, the motor drives and rotates each sprocket provided on the other axial end side of the looper roller, winding up each chain and raising the carriage to the upper position. [Figure 4]This is a schematic side view showing the state in which the sprockets provided on the other axial end side of the looper roller are rotated to rewind each chain and lower the carriage to the lower position in the carriage tilt correction device for a vertical looper according to the embodiment described above. [Figure 5] This is a schematic side view showing a state in which, in the carriage tilt correction device for a vertical looper of the above embodiment, the chain attached to one axial end of the looper roller has elongated more than the chain attached to the other axial end of the looper roller, and the end of the carriage at one axial end of the looper roller is positioned lower than the end of the carriage at the other axial end of the looper roller, causing the carriage to tilt. [Figure 6] This is a schematic side view showing the state in which, in the carriage tilt correction device for a vertical looper according to the embodiment, when the carriage is tilted as shown in Figure 5, the length of the protruding adjustment bolt is adjusted by an electric jack provided on one axial end side of the looper roller to bring the carriage into a horizontal position. [Figure 7] This is a schematic side view showing a state in which, in the carriage tilt correction device for a vertical looper according to the embodiment described above, when the carriage is adjusted to a horizontal state as shown in Figure 6 and then moved upward, the end of the carriage at one axial end of the looper roller becomes higher than the end of the carriage at the other axial end of the looper roller, and the amount of upward 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. [Figure 8] FIG. 7 is a schematic side view showing the state in which the carriage is moved upward using the present invention after being adjusted to a horizontal state as shown in FIG. 6 in the device for correcting carriage tilt in a vertical looper according to the embodiment. [Figure 9] FIG. 2 is a detailed diagram illustrating the pitch of the teeth of the sprocket and the pitch of the links of the chain. BEST MODE FOR CARRYING OUT THE INVENTION

[0017] The following is a detailed description of a carriage tilt correction device for a vertical looper according to an embodiment of the present invention, based on the accompanying drawings. Note that the carriage tilt correction device for a vertical looper according to the present invention is not limited to the embodiment shown below, and can be modified as appropriate within the scope of the invention.

[0018] In the vertical looper P used in this embodiment, as shown in Figures 1 and 2, the metal strip S is passed over a plurality of looper rollers 11 provided on a carriage 10 and a plurality of fixed rollers 21 provided at positions below the looper rollers 11 in order, so that the metal strip S runs.

[0019] Here, in the carriage 10 provided with the looper roller 11 as described above, chains 12a1, 12a2, 12b1, 12b2 are attached to both ends of the looper roller 11 in the longitudinal direction perpendicular to the axial direction on both sides of the axial direction and suspended from the looper roller 11, and the chains 12a1, 12a2 attached to both ends of the looper roller 11 in the longitudinal direction perpendicular to the axial direction on one end side of the axial direction are respectively connected to sprockets 13a1, 13a2 provided at the top of both ends of the looper roller 11 in the longitudinal direction perpendicular to the axial direction on one end side of the axial direction of the looper roller 11 and are respectively connected to axles 13a1, 13a2 on the other end side of the axial direction of the looper roller 11. The chains 12b1 and 12b2 attached to the other axial end of the looper roller 11 at both ends in the longitudinal direction perpendicular to the axial direction are wound around sprockets 13b1 and 13b2 attached to the other axial end of the looper roller 11 at both ends in the longitudinal direction perpendicular to the axial direction, respectively, and the ends of each chain 12a1, 12a2, 12b1 and 12b2 are attached to weights 14, so that the carriage 10 is suspended and held by each chain 12a1, 12a2, 12b1 and 12b2.

[0020] Then, motor 15 rotates sprockets 13a3, 13a4, 13b1, and 13b2 provided at the top of both longitudinal ends perpendicular to the axial direction at the other axial end of looper roller 11, and as shown in FIG. 3, the rotating sprockets 13a1, 13a2, 13a3, 13a4, 13b1, and 13b2 wind up the chains 12a1, 12a2, 12b1, and 12b2, raising carriage 10 to the upper position. On the other hand, as shown in FIG. 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 carriage 10 to the lower position.

[0021] Here, as described above, when the metal strip S is passed over the plurality of looper rollers 11 provided on the carriage 10 and the plurality of fixed rollers 21 provided at positions below the looper rollers 11 in sequence, and the metal strip S is allowed to run, elongation occurs in each of the chains 12a1, 12a2, 12b1, and 12b2 over time.

[0022] In this case, the overall length of chains 12a1, 12a2 that are connected to adjustment bolt 17b of electric jack 17a of carriage 10, and that follow a path from sprockets 13a1, 13a2 provided at the top of both longitudinal ends perpendicular to the axial direction at one axial end of looper roller 11, to sprockets 13a3, 13a4 provided at the top of both longitudinal ends perpendicular to the axial direction at the other axial end of looper roller 11, and that are connected to the upper end of weight 14, is longer than the overall length of chains 12b1, 12b2 that are connected to mounting bolt 17c of carriage 10, and that are wound around sprockets 13b1, 13b2 provided at the top of both longitudinal ends perpendicular to the axial direction at the other axial end of looper roller 11, and that are connected to the upper end of weight 14. Therefore, when elongation occurs in each of the chains 12a1, 12a2, 12b1, and 12b2 over time, the overall elongation (length) of the longer chains 12a1 and 12a2 becomes greater than the overall elongation (length) of the shorter chains 12a1 and 12a2.

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

[0024] In order to adjust the inclined carriage 10 to a horizontal state using the length adjustment device 17, in this embodiment, adjustment bolts 17b that can be raised and lowered by electric jacks 17a are provided on both sides of the longitudinal direction perpendicular to the axial direction at one axial end of the looper roller 11 of the carriage 10 on which the looper roller 11 is mounted, and chains 12a1, 12a2 at both ends of the longitudinal direction perpendicular to the axial direction at one axial end of the looper roller 11 are attached to the adjustment bolts 17b, while mounting bolts 17c are provided on both sides of the longitudinal direction perpendicular to the axial direction at the other axial end of the looper roller 11 of the carriage 10 on which the looper roller 11 is mounted, and chains 12b1, 12b2 at both ends of 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.

[0025] Here, when the length by which the adjustment bolt 17b protrudes upward is increased by the electric jack 17a, one axial end of the looper roller 11 on the carriage 10 moves downward, whereas when the length by 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 carriage 10 at one axial end of looper roller 11 to which chains 12a1 and 12a2 are attached is positioned lower than the end of carriage 10 at the other axial end of looper roller 11 to which chains 12b1 and 12b2 are attached, causing carriage 10 to tilt downward from the other end to one end, then, as shown in Figure 6, the length by which adjustment bolt 17b protrudes upward is shortened using electric jack 17a (see A in the figure), and one axial end of looper roller 11 on carriage 10 is moved upward, thereby adjusting carriage 10 so that it is in a horizontal position.

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

[0028] As shown in Figure 9, links 42 of a chain 41 mesh with teeth 44 of a sprocket 43 to drive the chain, but there is a dimensional margin 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, the chain can still mesh with the teeth of the sprocket to drive the chain.

[0029] In this state, after adjusting the carriage 10 to a horizontal position as described above, when the sprockets 13a1, 13a2, 13a3, 13a4, 13b1, and 13b2 are rotated by the motor 15 to move the carriage 10 upward, as shown in FIG. 7, even though the chains 12a1, 12a2 and the chains 12b1 and 12b2 are fed by the sprockets 13a1, 13a2, 13a3, 13a4, 13b1, and 13b2 with the same number of teeth, the chains 12a1, 12a2 and the chains 12b1 and 12b2 are attached to both ends in the longitudinal direction perpendicular to the axial direction at one end of the axial direction of the looper roller 11. Since the pitch elongation of the chains 12a1, 12a2 attached to the looper roller 11 is greater than the pitch elongation of the chains 12b1, 12b2 attached to the other axial end of the looper roller 11, the amount of winding up increases, and the end of the carriage 10 at one axial end of the looper roller 11 to which the chains 12a1, 12a2 are attached becomes higher than the end of the carriage 10 at the other axial end of the looper roller 11 to which the chains 12b1, 12b2 are attached, causing the carriage 10 to tilt upward from the other end side toward the one end side.

[0030] 7, in this embodiment, when the carriage 10 is moved upward, the vertical movement amount Y of the carriage 10 and the tilt amount X of the carriage 10 after the movement are determined by calculating the difference between the position of the end of the carriage 10 at one axial end of the looper roller 11 and the position of the end of the carriage 10 at the other axial end of the looper roller 11, and calculating the ratio (X / Y) of the tilt amount X to the vertical movement amount Y, and inputting the calculated ratio (X / Y) of the tilt amount X to the vertical movement amount Y to the control device 30. Any method may be used to measure the tilt amount X.

[0031] In this embodiment, after the carriage 10 is adjusted to a horizontal state as described above, the motor 15 rotates each of the sprockets 13a1, 13a2, 13a3, 13a4, 13b1, and 13b2 to move the carriage 10 in the vertical direction as described above. Based on the ratio (X / Y) of the amount of tilt X to the amount of vertical movement Y calculated as described above, the control device 30 adjusts the length of the adjustment bolt 17b that protrudes by the electric jack 17a, so that the carriage 10 can be moved in the vertical direction while remaining horizontal.

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

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

[0034] As a result, the carriage tilt correction device for the vertical looper P of this embodiment only needs to proportionally change the length of the adjustment bolt 17b of the electric jack 17a as the carriage 10 moves up and down between the upper and lower ends, and does not require complex real-time fine adjustments using sensors as in the conventional case, so the carriage 10 can be moved up and down while maintaining it horizontal, simply and at low cost.

[0035] For the sake of convenience, the tilt correction operation for carriage 10 is described here as being performed by simply raising and lowering carriage 10 once, but in reality, it takes a long time for the effects of chain stretching to appear, so it is not necessary to perform this operation every time carriage 10 is raised and lowered multiple times.

[0036] Also, here, the horizontal state was adjusted by raising the carriage 10 and reducing the length of protrusion above the adjustment bolt 17b, but the horizontal state can also be adjusted in the same manner by lowering the carriage 10, or by increasing the length of 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 bolt 21: Fixed roller 30: Control device 40: Sprocket 41: Chain 42: Link 43: Sprocket 44: Teeth A: Protruding length of the adjustment bolt B: Protruding length of adjustment bolt L1: Chain link pitch L2: Sprocket tooth pitch P: Vertical looper S: Metal strip X: Tilt amount Y: Amount of movement

Claims

1. In a device for correcting the inclination of a carriage in a vertical looper, a metal strip is passed over and run between a plurality of looper rollers provided on a carriage and a plurality of fixed rollers provided below the looper rollers in correspondence with the looper rollers, and at least four ends of the metal strip on both sides of the longitudinal direction perpendicular to the axial direction of the looper roller on the carriage on which the looper roller is provided are suspended by chains, and the chain suspending the carriage is driven by a sprocket to raise and lower the carriage. The device further comprises a length adjusting device for adjusting the length of the chain suspending the ends of the metal strip on both sides of the longitudinal direction on at least one side of the axial direction of the looper roller on the carriage, A carriage tilt correction device for a vertical looper, characterized in that a carriage that is tilted due to the difference in elongation of the chains on both sides of the axial direction of the looper roller 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 up and down, the amount of vertical movement of the carriage and the amount of tilt of the carriage after movement are determined, and the ratio of the amount of tilt to the amount of vertical movement is calculated, and when moving the carriage that 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 axial direction of the looper roller based on the ratio of the amount of tilt to the amount of vertical movement so that the carriage is horizontal.

2. 2. The device for correcting the inclination of a carriage in a vertical looper according to claim 1, wherein the length adjustment device is an adjustment bolt that is raised and lowered by an electric jack on the carriage, and one end of the chain is attached to the adjustment bolt.

3. 2. A device for correcting the tilt of a carriage in a vertical looper as described in claim 1, characterized in that the carriage, which has been tilted due to the difference in elongation of the chains on both sides of the axial direction of the looper roller, is adjusted to a horizontal state by the length adjustment device, and in this state, the chains are driven by the sprockets 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, and the ratio of the amount of tilt to the amount of upward movement is calculated, and when the carriage, which is in a horizontal state, is moved up and down, the length adjustment device adjusts the length of the chain on at least one side of the axial direction of the looper roller based on the ratio of the amount of tilt to the amount of upward movement so that the carriage is horizontal.

4. A device for correcting the inclination of a carriage in a vertical looper as described in any one of claims 1 to 3, characterized in that the amount of inclination is calculated as 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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