CN112095216B

CN112095216B - Yarn tension adjusting device

Info

Publication number: CN112095216B
Application number: CN202010541805.2A
Authority: CN
Inventors: 柴本尊辉
Original assignee: Shima Seiki Mfg Ltd
Current assignee: Shima Seiki Mfg Ltd
Priority date: 2019-06-18
Filing date: 2020-06-15
Publication date: 2022-08-09
Anticipated expiration: 2040-06-15
Also published as: KR20200144485A; JP2020204106A; KR102393164B1; EP3753887B1; EP3753887A1; CN112095216A

Abstract

The invention provides a yarn tension adjusting device, wherein, the bidirectional movement for contacting and separating one opposite surface relative to the other opposite surface when increasing and decreasing the force of a spiral spring can be realized by a compact and cheap structure, thereby inhibiting the device from upsizing and realizing the cost reduction. In a yarn tension adjusting device for adjusting tension applied to a yarn clamped between opposite surfaces of opposite first and second disks, the first disk is configured to be capable of contacting and separating on the same axis with respect to the second disk. The first disk is provided with a permanent magnet, while the second disk is provided with an electromagnet connected to a power supply so that the magnetic pole can be changed and the amount of current flow can be changed. A coil spring constantly biasing the opposing surface of the first disk to approach the opposing surface of the second disk is mounted in compression between a screw member screwed to one end of the shaft and the back surface side of the opposing surface of the first disk.

Description

Yarn tension adjusting device

Technical Field

The present invention relates to a yarn tension adjusting device for adjusting tension applied to a yarn sandwiched between opposing surfaces.

Background

In general, in such a yarn tension adjusting device, in order to avoid the yarn from the bobbin from being pulled out more than necessary, the yarn tension adjusting device is provided in an antenna base device of the flat knitting machine, and an appropriate tension is applied to the yarn sandwiched between the opposing surfaces of the opposing pair. One of the opposing surfaces is configured to be able to contact and separate from the other opposing surface, and the other opposing surface is constantly biased by a coil spring provided on the one opposing surface. The coil spring includes a screw member screwed to a shaft end extending in the expansion and contraction direction, and the tension applied to the yarn between the opposing surfaces is adjusted by increasing or decreasing the biasing force of one of the opposing surfaces with respect to the other opposing surface side as the length in the expansion and contraction direction is changed by the tightening or loosening operation of the screw member.

As such a yarn tension adjusting device, a device is known which adjusts tension applied to an upper yarn on a yarn feeding path of a sewing machine which supplies the upper yarn from a creel to a needle (see patent document 1). The yarn tension adjusting device includes a coil spring that constantly applies a force to one of the opposing surfaces so as to approach the other opposing surface side, and a plunger that is pressed by an electromagnetic solenoid, and adjusts the tension of the upper yarn in a wide range in a state where the pressing force that cannot be provided by the biasing force of the coil spring is applied to the other opposing surface side by adding the pressing force of the plunger to the biasing force of the coil spring.

[ Prior Art document ]

[ patent document ]

[ patent document 1 ] Japanese patent laid-open publication No. 2002-210279

Disclosure of Invention

However, in the above-described conventional yarn tension adjusting device, although the biasing force of the biasing means such as a coil spring is increased by the pressing force of the plunger, the biasing force of the biasing means cannot be reduced. Therefore, in order to reduce the biasing force of the biasing means, it is necessary to newly add a mechanism including a plunger that is moved by pressing one opposing surface in a direction away from the other opposing surface by the electromagnetic solenoid. However, if two mechanisms including plungers that press one opposing surface in both directions of contact and separation with respect to the other opposing surface by an electromagnetic solenoid are provided in order to increase or decrease the biasing force of the biasing means, the apparatus itself becomes very large in size and the cost increases.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a yarn tension adjusting device that can perform bidirectional movement for bringing one opposing surface into contact with and away from the other opposing surface when increasing and decreasing the biasing force of a biasing unit without using 2 mechanisms each including an electromagnetic solenoid and a plunger, and that can reduce the cost while suppressing the size of the device itself.

In order to achieve the above object, the present invention is premised on a yarn tension adjusting device including a yarn tension adjusting device main body that adjusts tension applied to a yarn sandwiched between opposing surfaces. Further, one of the two opposing surfaces is configured to be able to be brought into contact with and separated from the other opposing surface, and a permanent magnet is provided on the one opposing surface side, while an electromagnet connected to a power supply so that a magnetic pole can be changed and an amount of current can be changed is provided on the other opposing surface side. A biasing unit is provided on the one opposing surface side, and the biasing unit always elastically biases the one opposing surface so as to approach the other opposing surface side.

Further, the biasing unit may include a biasing force changing unit that changes a biasing force of the biasing unit.

The operation of changing the biasing force of the biasing unit by the biasing force changing unit may be electrically operated by an electric unit.

Further, the yarn tension adjusting apparatus main body may be applied to an antenna base device of a flat knitting machine.

[ Effect of the invention ]

As described above, by providing the permanent magnet on the one opposing surface side opposing the yarn across the yarn, providing the urging means for constantly urging the one opposing surface toward the other opposing surface side, and providing the electromagnet capable of changing the magnetic pole on the other opposing surface side, if the magnetic pole of the electromagnet is changed, the attraction force and the repulsion force opposing the polarity of the permanent magnet can be obtained. Therefore, the biasing force of the biasing means is increased by the attractive force when the magnetic pole of the electromagnet is changed to the polarity different from that of the permanent magnet, and the biasing force of the biasing means is decreased by the repulsive force when the magnetic pole of the electromagnet is changed to the same polarity as that of the permanent magnet. In this way, the yarn tension adjusting device is configured by the permanent magnet and the urging means on the one opposing surface side and the electromagnet capable of changing the magnetic pole and changing the amount of energization on the other opposing surface side, and thus, the bidirectional movement of bringing one opposing surface into contact with and out of contact with the other opposing surface when the urging force of the urging means is increased or decreased is performed in accordance with the switching of the attraction force and the repulsion force caused by the change of the magnetic pole of the electromagnet and the magnitude of the attraction force and the repulsion force caused by the amount of energization to the electromagnet, and it is not necessary to use 2 mechanisms each including an electromagnetic solenoid and a plunger. This can reduce the cost while suppressing the size increase of the yarn tension adjusting device itself.

Further, by the biasing force of the biasing means, a constant tension can be applied to the yarn sandwiched between the opposing surfaces without depending on the magnetic force, and the power consumption can be reduced.

In addition, although the permanent magnet is provided on the side of one opposing surface that moves relative to the other opposing surface in the state where the biasing means is provided, the mechanism for increasing and decreasing the biasing force of the biasing means is lighter than the side of the other opposing surface that includes the electromagnet. This makes it possible to exhibit high responsiveness of the one opposing surface to the attractive force and the repulsive force due to the change in the magnetic pole and the change in the amount of energization of the electromagnet.

Further, by providing the biasing unit with a biasing force changing unit that changes the biasing force, the biasing force can be changed without depending on the magnetic force of the permanent magnet and the electromagnet, and the tension applied to the yarn can be arbitrarily applied. Further, with the biasing force by the biasing means as a reference, it is preferable to perform constant tension control or control such as applying tension at an arbitrary timing, and power consumption can be further reduced.

Further, by providing the urging force changing means with an electric means for electrically changing the urging force of the urging means, the urging force of the urging means of each yarn tension adjusting device can be electrically changed, and the manual operation of changing the urging force of the urging means can be eliminated. In this case, since the biasing force of the biasing unit by the electric unit is changed based on the tension value detected by the tension sensor, the tension sensor can monitor the tension of the yarn, and the tension sensor can also cope with the tension fluctuation due to external factors such as the accumulation of yarn waste.

Further, by applying the yarn tension adjusting device main body to the antenna base device, it is possible to replace the conventional yarn tension adjusting device in which the opposing surfaces are biased only by the biasing force of the biasing means in each antenna base device having a relatively large space, without difficulty in installation.

Drawings

Fig. 1 is a perspective view of an antenna base device provided with a yarn tension adjusting device according to an embodiment of the present invention.

Fig. 2 is a perspective view of the yarn tension adjusting device of fig. 1.

Fig. 3 is a cross-sectional view of the yarn tension adjusting device of fig. 2.

[ Mark Specification ]

1 antenna station device

2 yarn tension adjusting device

20 yarn tension adjusting device body

211 opposing faces of the first disk (one opposing face)

221 opposite surface of the second disk (opposite surface of the other side)

24 permanent magnet

25 electromagnet

27 spiral spring (forcing unit)

28 screw component (forcing change unit)

Y yarn

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a perspective view of an antenna base device including a yarn tension adjusting device according to an embodiment of the present invention. As shown in fig. 1, the antenna base device 1 is provided in plural on a flat knitting machine not shown, and includes yarn tension adjusting devices 2, and the yarn tension adjusting devices 2 independently adjust the tension applied to the yarn Y drawn out from each yarn bundle. The yarn tension adjusting device 2 is attached to the base end side (upstream side of the yarn feeding path) of the frame 10 of the antenna base device 1.

A plurality of side tensioners are provided on the side surface of the flat knitting machine, and the side tensioners take slack or the like when the yarn Y to which tension is applied by the antenna base device 1 is fed to the knitting needle, and a plurality of yarn feeding paths are densely present due to the side tensioners.

The antenna base device 1 further includes a tension arm 11 extending toward the tip above the frame 10. Reference numerals 12 to 17 denote yarn guide portions through which the yarn Y is guided. The yarn Y pulled out from the yarn bundle is fed to the carriage (not shown) side from the yarn guide 16 and the yarn guide 17 of the tension arm 11 through the yarn guide sections 12 to 15 in a state where tension is applied by the yarn tension adjusting device 2. At this time, since the yarn guide section 13 is provided at the tip of an arm that swings up and down with the vicinity of the base end side of the frame 10 as a rotation axis, the arm swings and yarn breakage can be detected when the yarn Y breaks.

Fig. 2 shows a perspective view of the yarn tensioning device 2 from fig. 1, and fig. 3 shows a sectional view of the yarn tensioning device 2 from fig. 2. As shown in fig. 2 and 3, the yarn tension adjusting device 2 includes a yarn tension adjusting device main body 20, and the yarn tension adjusting device main body 20 applies tension to the yarn Y sandwiched between the

opposing surfaces

211 and 221 of the opposing first and

second disks

21 and 22 to adjust the tension.

The first and

second disks

21, 22 are provided on the same shaft 23, and the second disk 22 of the two

disks

21, 22 is fixed to the other end side (right end side in fig. 3) of the shaft 23. On the other hand, the first disc 21 is movably provided on the shaft 23. That is, the first disk 21 is provided on the shaft 23 so that the opposing surface 211 (one opposing surface) can be in contact with and separated from the opposing surface 221 (the other opposing surface) of the second disk 22.

The first disc 21 is provided with a substantially annular permanent magnet 24 on the back side of the opposing surface 211. On the other hand, the second disc 22 is provided with an electromagnet 25 on the back side of the opposing surface 221. The electromagnet 25 is connected to a power supply (not shown) via an inverter (not shown) for changing the direction and amount of current flow so that the magnetic pole and the amount of current flow can be changed, and the change is controlled by a controller of the weft knitting machine (not shown).

The electromagnet 25 includes an iron core 251 and a coil 252 wound around the iron core 251, and the facing surface 221 side of the second disk 22 serves as a magnetic pole surface. The first and

second disks

21 and 22 are made of a nonmagnetic material such as stainless steel. The other end of the shaft 23 is fitted into the core 251.

Further, a substantially circular insertion hole 231 is provided in the shaft 23 at a position corresponding to the position between the facing

surfaces

211, 221 of the first and

second disks

21, 22. A communication groove 232 communicating with the outside is provided in the insertion hole 231, and tension is applied to the yarn Y inserted through the insertion hole 231 between the facing

surfaces

211, 221 of the first and

second disks

21, 22 via the communication groove 232.

The first disc 21 is provided with a coil spring 27, and the coil spring 27 serves as a biasing means that constantly biases the opposing surface 211 of the first disc 21 elastically so as to approach the opposing surface 221 of the second disc 22. The coil spring 27 is attached to a portion between the screw member 28 screwed to one end (left end in fig. 3) of the shaft 23 and the back surface side of the opposing surface 211 of the first disc 21 in a compressed manner in a state where the extending and contracting direction thereof is aligned with the upper side of the shaft 23. In this case, the screw member 28 moves in the expansion/contraction direction of the coil spring 27 on the shaft 23 by the manual tightening operation (changing operation), and functions as a biasing force changing means for changing the biasing force of the coil spring 27.

Therefore, in the present embodiment, the permanent magnet 24 is provided on the first disk 21 facing each other with the yarn Y interposed therebetween, the coil spring 27 that constantly biases the facing surface 211 of the first disk 21 toward the facing surface 221 of the second disk 22 is provided, and the electromagnet 25 whose magnetic pole can be changed is provided on the second disk 22, so that if the magnetic pole of the electromagnet 25 is changed by the inverter, an attraction force and a repulsion force are obtained that oppose the polarity of the permanent magnet 24. Since the electromagnet 25 is connected to the power supply so as to be able to change the amount of current, the attraction force and the repulsion force with respect to the permanent magnet 24 are variable according to the amount of current.

Therefore, the biasing force of the coil spring 27 is increased by the attractive force when the magnetic pole of the electromagnet 25 is changed to the polarity different from that of the permanent magnet 24, while the biasing force of the coil spring 27 is decreased by the repulsive force when the magnetic pole of the electromagnet 25 is changed to the polarity identical to that of the permanent magnet 24. In this way, the yarn tension adjusting device 2 is configured by the permanent magnet 24 of the first disk 21, the coil spring 27, and the electromagnet 25 of the second disk 22, which can change magnetic poles and can change the amount of energization, whereby the movement in both directions of bringing the opposing surface 211 of the first disk 21 into contact with and out of contact with the opposing surface 221 of the second disk 22 when increasing or decreasing the biasing force of the coil spring 27 is performed in accordance with the switching of the attractive force and repulsive force due to the change of the magnetic poles of the electromagnet 25 and the magnitude of the attractive force and repulsive force due to the amount of energization to the electromagnet 25, and it is not necessary to use 2 mechanisms each including an electromagnetic solenoid and a plunger. This can reduce the cost while suppressing an increase in size of the yarn tension adjusting device 2 itself.

Further, the urging force of the coil spring 27 can apply a constant tension to the yarn Y sandwiched between the opposing

surfaces

211, 221 of the first and

second disks

21, 22 without depending on the magnetic force, and power consumption can be reduced without requiring constant supply of power to the electromagnet 25.

In addition, although the permanent magnet 24 is provided on the first disk 21 that moves relative to the opposing surface 221 of the second disk 22 in the state where the coil spring 27 is provided, the mechanism for increasing and decreasing the biasing force of the coil spring 27 is lighter than the second disk 22 provided with the electromagnet 25. Accordingly, in the case of a flat knitting machine having a required speed such as timing of switching the tension of the yarn between the press knitting and the pull knitting, that is, timing of reversing the carriage, high responsiveness of the first disc 21 can be exhibited according to the attraction force and the repulsion force caused by the change of the magnetic pole of the electromagnet 25.

Further, since the screw member 28 having the coil spring 27 mounted in compression between the screw member 28 and the first disk 21 functions as an urging force changing means for changing the urging force of the coil spring 27 by tightening or loosening, the urging force can be changed without depending on the magnetic force of the permanent magnet 24 and the electromagnet 25, and the tension on the yarn Y can be arbitrarily applied. Further, the control of constant tension and the control of applying tension at an arbitrary timing are preferable with reference to the biasing force by the coil spring 27, and power consumption can be further reduced.

Further, since the yarn tension adjusting device main body 20 is applied to the antenna base device 1 of the flat knitting machine, it can be installed without difficulty in each of the antenna base devices 1 on the upper side where a space is relatively large compared to a portion where a plurality of yarn feeding paths are densely present due to a plurality of side tensioners like the side surface of the flat knitting machine, instead of the conventional yarn tension adjusting device in which the opposing surfaces are urged only by the urging force of the urging means.

The present invention is not limited to the above embodiment, and includes other various modifications. For example, in the above-described embodiment, the screw member 28 is manually tightened or loosened when the biasing force of the coil spring 27 is changed, but the screw member may be electrically tightened or loosened by an electric unit such as a motor. Thus, the biasing force of the coil spring of each yarn tension adjusting device can be electrically changed, and the manual tightening and loosening operation of the screw member can be eliminated. Further, since the biasing force of the coil spring by the electric unit is changed based on the tension value detected by the tension sensor, the tension of the yarn can be monitored by the tension sensor, and the tension fluctuation due to external factors such as the accumulation of yarn waste can be dealt with.

In this case, since the point that the biasing force of the coil spring is changed by the tightening/loosening operation of the screw member according to the rotation amount of the motor is not at the middle of knitting by the flat knitting machine but at a timing before knitting, the control of the tension during knitting is not required to be sensitive, and a compact and inexpensive motor can be used.

In the above embodiment, the coil spring 27 is used as the biasing means, but it may be an N-shaped plate spring or an M-shaped plate spring, and these plate springs may be attached by compression between the screw member at one end of the shaft and the back surface side of the opposing surface of the first disk.

In the above-described embodiment, the yarn tension adjusting device 2 is provided in the antenna base device 1 of the flat knitting machine, but it is needless to say that the yarn tension adjusting device may be provided at any place by avoiding each side tensioner on the side surface of the flat knitting machine as long as the yarn is fed from the yarn bundle to the knitting needle before the yarn is fed to the knitting needle.

Claims

1. A yarn tension adjusting device comprising a yarn tension adjusting device body having a first disk and a second disk facing each other, a first facing surface of the first disk and a second facing surface of the second disk facing each other, the yarn tension adjusting device body adjusting tension applied to a yarn sandwiched between the first facing surface and the second facing surface,

the first opposing surface is configured to be capable of contact separation with respect to the second opposing surface,

a permanent magnet and a biasing unit are provided on the first opposing surface side, while an electromagnet connected to a power supply so that the magnetic pole can be changed and the amount of current flow can be changed is provided on the second opposing surface side,

the urging unit elastically urges the first opposing surface so as to approach the second opposing surface side all the time, the urging force of the urging unit is increased by an attractive force when the magnetic pole of the electromagnet is changed to a polarity different from the permanent magnet, and the urging force of the urging unit is decreased by a repulsive force when the magnetic pole of the electromagnet is changed to the same polarity as the permanent magnet, and the magnitudes of the attractive force and the repulsive force are changed by changing the amount of energization of the electromagnet,

the first disk and the second disk are formed of a non-magnetic body.

2. Yarn tensioning device according to claim 1,

the urging unit includes an urging force changing unit that changes the urging force of the urging unit.

3. Yarn tensioning device according to claim 2,

the changing operation of the biasing force of the biasing unit by the biasing force changing unit is electrically performed by an electric unit.

4. A yarn tension adjusting device according to any one of claims 1 to 3,

the yarn tension adjusting device main body is applied to an antenna table device of a flat knitting machine.