JPH0372738B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a control mechanism for the yarn feeding speed of a yarn feeding device for a circular knitting machine. The present invention therefore relates to a feeding tape speed control mechanism configured to feed the tape while controlling the feeding speed.

[Conventional technology]

Conventionally, drive pulleys whose radius can be expanded or contracted have been disclosed under the name of expansion pulleys in Japanese Patent Publication No. 30-2203, Japanese Patent Publication No. 1021-1973, and Japanese Patent Publication No. 708-1973. a first disc with a radial guide groove formed therein, a second disc with a spiral guide groove formed therein, a pin that slides within the radial guide groove, and the spiral guide groove. a plurality of movable blocks having pins sliding therein and forming an operating radius;
By rotating the discs in relative opposite directions, the movable block was moved in the radial direction and the operating radius was changed. A circular knitting machine equipped with the drive pulley whose radius can be freely changed is disclosed in Japanese Patent Publication No. 18427/1983. This is because an endless feed tape that controls the yarn feeding speed in a circular knitting machine equipped with a plurality of yarn feeding mechanisms is connected to a pair of guide pulleys and a driving pulley to drive the driving pulley. ,
A first disc with a radial guide groove formed therein, a second disc with a spiral guide groove formed therein, a pin that slides within the radial guide groove, and a pin that slides within the spiral guide groove. It is configured to have a variable radius by being equipped with a plurality of movable blocks having sliding pins and forming an operating radius. When changing the yarn feeding speed, that is, the speed of the feed tape, the operation of the circular knitting machine is temporarily stopped, a stepladder or other step is prepared, and the first and second disks of the drive pulley are moved. Warm up the fixing nut that is fixed to the drive shaft, and
After rotating the two discs relative to each other and moving the rotating block in the radial direction to change the operating radius, tighten the fixing nut and rotate the first disc and the second disc.
and the disk are fixed to the drive shaft in such a manner that they cannot rotate relative to each other. As the operating circumference of the drive pulley changes due to the above operation, the tension of the feeding tape changes. This is adjusted to an appropriate tension by adjusting the tension adjustment mechanism. Try operating the stopped circular knitting machine and check whether the desired tape speed, that is, the yarn feeding speed is reached. If the yarn feeding speed is not the desired one, stop the circular knitting machine again and return to the desired yarn feeding speed. Repeat the above operations until a yarn feeding speed of . That required work.

[Issue to be solved]

In this way, in a conventional circular knitting machine equipped with an expansion pulley, when changing the yarn feeding speed, the circular knitting machine must be stopped and the fixing nut must be loosened to change the radius. There is a problem that work efficiency is extremely low. Furthermore, if the fixing nut is not tightened or is forgotten after adjusting the feed speed, the radius will change during operation, resulting in knitting damage. Furthermore, when loosening the fixing nut and rotating the two disks, there is a problem that the block will come off unless it is turned as horizontally as possible. Furthermore, since the tension of the feeding tape changes each time the radius is changed, there is a complication in that the tension must be readjusted each time by the tension adjustment mechanism. In this way, in conventional circular knitting machines equipped with an expansion pulley, it was possible to manually adjust the yarn feeding speed, but this required an extremely complicated procedure and was costly in terms of effort and time. The problem was that it was very inefficient. Therefore, the present invention aims to provide a speed control mechanism for the feed tape of a circular knitting machine that can automatically control the radius adjustment of the expansion pulley and the adjustment of the tension of the feed tape that changes accordingly. An invention is an object.

[Means to solve the problem]

In order to solve the above problems, in the feeding tape speed control mechanism according to the present invention, an endless feeding tape that controls the yarn feeding speed in a circular knitting machine equipped with a plurality of yarn feeding mechanisms is connected to a pair of guide pulleys and driven by a pair of guide pulleys. In a speed control mechanism for a feed tape in a circular knitting machine that is driven by being hooked onto a pulley, a first disc in which a radial guide groove is formed and a second disc in which a spiral guide groove is formed. and a plurality of movable blocks comprising a pin that slides in the radial guide groove and a pin that slides in the spiral guide groove to configure an operating radius, and the drive pulley is configured to have a variable radius. , a differential gear mechanism that moves the movable block in the radial direction by differentially moving the first disc and the second disc to vary the operating radius; and a differential gear mechanism that drives the differential gear mechanism. The apparatus is constructed of a dynamic gear mechanism driving means and an interval control means for increasing and decreasing the interval between the pair of guide pulleys in conjunction with the expansion and contraction of the radius of the drive pulley by the differential gear mechanism. be.

[Effect]

In the present invention, the radius of the two discs of the drive pulley is changed by mutually rotating them using a differential gear mechanism, so the speed of the tape being fed by the drive pulley is increased. The yarn feeding speed, whose speed is controlled by the feed tape, also changes. By expanding or contracting the interval between the guide pulleys in conjunction with the change in the radius of the drive pulley, the tension of the feeding tape that has changed due to the change in the diameter of the drive pulley is corrected to an appropriate state.

【Example】

The feeding tape speed control mechanism according to the present invention will be explained in detail below with reference to the drawings. FIG. 1 is a partially cutaway plan view of a feeding tape speed control mechanism according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the same embodiment. In the drawings, 1 is an expansion pulley, 4 is an operating gear mechanism, 5 is a control motor, 11a is an upper lid, 11b is a lower lid, 12 is a radially movable block, 1
Reference numeral 2a indicates a guide pin provided upright on the upper surface of the block 12, 12b indicates a guide plate provided on the lower surface of the block 12, 13 indicates a radial guide groove carved in the radial direction on the inner surface of the lower cover 11b, and 14 indicates an inner surface of the upper cover 11a. A helical guide groove is formed in a spiral shape, and L is a drive shaft that is rotationally driven by a drive motor MT as a pulley drive means to rotate the upper cover 11a. In the feeding tape speed control mechanism configured as described above, the upper lid 11a of the expansion pulley 1
When the lower lid 11b and the lower lid 11b are rotated with respect to each other by the operating gear mechanism 4, the guide pin 12a and the guide plate 12b slide in the radial guide groove 13 and the spiral guide groove 14, so that the block 12 slides in the radial direction. Therefore, the radius R of the working circumference formed by the outer peripheral surface of the block 12 changes, the circumferential speed of the working circumference changes, and the speed of the feed tape 3 changes. Therefore, the feeding speed of the yarn S, which is fed between the feed tape 3 and the feed pulley 10, changes. Further, in the drawings, 2a and 2b are guide pulleys, 6a and 6b are screw screws with mutually opposite pitch external threads, and 51 is rotationally driven by the control motor 5 in conjunction with the operating gear mechanism 4, Gears for rotating the screws 6a and 6b, 6c and 6d are internally threaded sliding bodies into which the screws 6a and 6b are screwed, and 7 is the guide pulley 2a and 2b and the sliding bodies 6c and 6d. The slide tubes 8a and 8b integrally formed are slidably fitted onto the guide shafts, and 9a and 9b are limit switches for detecting the movement limits of the guide pulleys 2a and 2b, which are installed upright on the slide tube 8a. It is operated by a pin 10. In the tension correction mechanism having the above configuration, block 1 of the expansion pulley 1
The radius R of the operating circumference formed by the outer peripheral surface of 2
When this changes, the tension of the feed tape 3 changes, so the tension of the feed tape 3 is kept constant by the guide pulleys 2a and 2b, which move in conjunction with the movement of the block 12. That is, when the operating gear mechanism 4 is operated by the control motor 5 to widen the radius of the expansion pulley 1, the control motor 5 rotates the screws 6a and 6b, so that the guide pulleys 2a and 2b are mutually moved. By separating them, the tension of the feed tape 3 is kept constant. In addition, when reducing the radius of the expansion pulley 1, the screw screws 6a, 6b
Rotate the tension pulleys 2a and 2a in the opposite direction to the above, and
By placing 2b close to each other, the tension is kept constant. Since the screws 6a and 6b are threaded with opposite pitches, by changing the direction of rotation by the control motor 5, the guide pulleys 2a and 2b can be moved away from or close to each other. Naturally, even if the screws 6a and 6b are not oppositely pitched and are the same screw, if they are separated and rotated in opposite directions, the guide pulleys 2a and 2b can be moved apart or close to each other in the same manner as described above. It's possible. Since the slide tubes 8a and 8b slide while being regulated by the guide shaft 7, even if the tension of the feed tape 3 is strong, the guide pulleys 2a and 2b can be slid by the screw screws 6a and 6b. . The sliding range of the slide tubes 8a, 8b, that is, the movement limits of the guide pulleys 2a, 2b are limited by limit switches 9a, 9b. The details of the operating gear mechanism 4 are as shown in FIG. In the drawing, when operating at a constant tape feed rate, the drive motor
When the shaft L of the expansion pulley 1 is driven by the MT, the gear K fixed to the shaft L rotates together with the upper lid 11a, and the engaged gear J
rotates. Therefore, gear I, which is fixed to gear J, rotates gear H with which it is meshed. When gear H rotates, gear G meshing with it
rotates, causing gear D, which is fixed by axis C, to rotate. When the gear D rotates, the gear E that meshes with it rotates, and the fixed lower cover 1
1b also rotates in the same manner as the upper lid 11a. In this way, when the diameter changing control motor 5 is stopped, the upper cover 11a and the lower cover 11b rotate simultaneously, and the rotation speed is determined by the drive motor MT. However, when the upper cover 11a and the lower cover 11b are relatively rotated to slide the block 12, the control motor 5 is rotated and the worm gear A is rotated.
Rotate. The rotation of worm gear A causes gear B to rotate. As the gear B rotates, the shaft C also revolves around the shaft L. Therefore, the rotation transmitted from the shaft L changes depending on the revolution of the shaft C, and the rotation of the lower lid 11b is different from the rotation of the upper lid 11a. At this time, whether the axis L is rotating or stopped,
The upper lid 11a and the lower lid 11b rotate by a predetermined angle. In this way, the upper cover 11a and the lower cover 11b rotate relative to each other, so that the block 12 slides in the radial direction and the operating radius R changes. Therefore, since the feeding speed of the feeding tape 3 changes and the yarn feeding speed changes, the size of the stitches can be changed. Moreover, at this time, there is no need to adjust the tension of the feed pulley 3.

【effect】

In the feeding tape speed control mechanism according to the present invention, the radius of the drive pulley is changed by mutually rotating the two discs of the drive pulley using the differential gear mechanism. The speed of the driven feed tape changes, and the yarn feeding speed whose speed is controlled by the feed tape also changes. By expanding or contracting the interval between the guide pulleys in conjunction with the change in the radius of the drive pulley, the tension of the feeding tape that has changed due to the change in the diameter of the drive pulley is corrected to an appropriate state. Therefore, it is possible to change the radius of the drive pulley while operating the circular knitting machine, resulting in the effect of significantly improving work efficiency. In addition, since the interval between the guide pulleys is controlled to expand or contract in conjunction with the expansion or contraction of the radius of the drive pulley,
The tension of the feeding tape, which changes each time the radius of the drive pulley is changed, is automatically corrected, which has the effect of saving the effort of tension adjustment. In this way, the adjustment of the radius of the expansion pulley and the adjustment of the tension of the feed tape, which changes accordingly, can be automatically controlled in conjunction with each other, so the yarn feeding speed of the circular knitting machine can be adjusted This provides the advantage of being able to continuously and freely change the drive pulley, guide pulley, or feeding tape without stopping the operation or directly touching the drive pulley, guide pulley, or feeding tape during operation. Therefore, by controlling the differential gear mechanism drive means using control signals from a computer or the like, it has become possible to provide a circular knitting machine with functions not previously available.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view of a feeding tape speed control mechanism according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the same embodiment. 1... Expansion pulley, 2a, 2b
...Guide pulley, 3...Feeding tape, 4...
Differential gear mechanism, 5... Control motor (differential gear mechanism driving means), 12... Movable block, 11a, 1
1b...Upper lid, lower cover (disk),...Feeding tape speed control mechanism,...Tension correction mechanism, MT...
Drive motor (pulley drive means), R...diameter, S
……thread.

Claims (1)

[Claims] 1. A circular knitting machine equipped with a plurality of yarn feeding mechanisms, in which an endless feed tape for controlling the yarn feeding speed is hooked between a pair of guide pulleys and a drive pulley to be driven. A feeding tape speed control mechanism includes a first disk having a radial guide groove formed therein, a second disk having a spiral guide groove formed therein, and a pin sliding within the radial guide groove. a drive pulley configured to have a variable radius, including a plurality of movable blocks including a pin that slides in the spiral guide groove and forming an operating radius; A differential gear mechanism that moves the movable block in the radial direction by differentially moving the first disc and the second disc while rotating and driving the movable block to vary the operating radius; and the differential gear mechanism. A differential gear mechanism driving means, and a tension of the feeding tape is kept constant by expanding and contracting the distance between the pair of guide pulleys in conjunction with the expansion and contraction of the radius of the drive pulley by the differential gear mechanism. 1. A feeding tape speed control mechanism comprising: a maintaining interval control means.