JPS63258373A - Thread tension control device - Google Patents

Abstract

PURPOSE:To make uniform thread tension control possible by constituting such that a spring having retractive spring force is arranged to surround a peripheral surface of a pulley rotatably attached to a shaft and one end of the spring is connected to a rod lever while the other end connected to a pin extending out of a control handle. CONSTITUTION:A thread passes through a thread guide and further between a thread guide 2 on a fixed thread passage 3 and a thread guide 6 is a thread passage lever 6 in a zigzag line. The thread passage lever 6 is rotated by the tension of the running thread together with a rotary shaft and swings in the direction to approach the fixed thread passage 3. At this time, a rod lever 16 fixed on the rotary shaft also swings together with the swing of the thread passage lever 6. As a result, a coil spring 15 is extended against its spring force. As the spring force of the coil spring 15 increases, a force is exerted to pull back the thread passage lever 6. As the thread tension and the spring force of the coil spring 15 balance, a constant tension is always applied to the running thread.

Description

[Detailed description of the invention] [Industrial fields of application] This invention relates to a thread tension adjustment device.

K Conventional technology λ Conventionally, in one second of the thread tension adjustment device, a biasing force by a spring is applied to the thread 3 lever, and the thread guide on the thread guide lever and the thread guide on the thread guide mount are moved in a zigzag manner. Passing number-
There is a thread tension adjustment device that always applies a constant tension to the thread, but the biasing force l of the spring applied to the thread guide lever is solely based on a clockwork spring, and the biasing force can be adjusted by rotating the adjustment knob. Adjustments were made by tightening or loosening the mainspring.

Problems to be Solved by the Invention K] The conventional thread tension adjustment device described above obtains the biasing force using a mainspring spring, so when adjusting the biasing force, the adjustment knob must be rotated many times. Adjustments must be made by squeezing or loosening the springs, and it is difficult to keep the biasing force constant, especially the biasing forces of the numerous thread tension adjustment devices installed on the machine stand. Problems such as the applied biasing force fluctuating during use were recognized. This invention was made with the aim of solving these problems.

Means for Solving Problem K] The thread tension adjusting device of the present invention has a fixed thread path on one surface of a casing, and a thread path lever that has one end pivotally supported on a rotating shaft and swings by the biasing force of a spring. In a thread tension adjustment device, which is provided opposite to each other and has an adjustment handle on the other side that changes the biasing force of the spring, a thread tension adjustment device is provided that surrounds the outer circumferential surface of a pulley that is rotatably mounted on a shaft to adjust the tension in the contraction direction. A spring having a biasing force is mounted, one end of the spring is engaged with a rod lever fixed to an end of a rotating shaft that fits into the shaft, and the other end is engaged with a pin extending from an adjustment handle. The problem was solved by providing at least one member inside the casing.

K-Function] Since the yarn tension adjusting device of the present invention has the above-mentioned configuration, the tension of the yarn passing in a zigzag pattern between the yarn guide on the fixed yarn path and the yarn guide on the yarn path lever causes The thread guide lever rotates together with the rotating shaft and swings in a direction approaching the fixed thread guide, but as the thread guide lever swings, the rod lever fixed to the rotating shaft also swings, and as a result, the spring exerts a biasing force. As the yarn is stretched against the tension and the biasing force of the spring increases, a force in the direction of pulling it back is applied to the thread guide lever, creating an equilibrium relationship between the tension of the thread and the biasing force of the spring, and the running thread It has the effect of always applying a constant tension to the

K implementation example 1 The present invention will be described in detail below with reference to the drawings.

1 to 4 are diagrams showing a first embodiment of the present invention, in which one side of a casing 1 consisting of a box body 1a and a lid body 1b (in the illustrated example, the beneficial body 1b side) A fixed yarn path 3 having a yarn guide 2 and a yarn path lever 6 are provided facing each other. The fixed thread path 3 is screwed to the lid 1b, and the thread path lever 6 has one end supported by a rotating shaft 4 provided at the center of the lid 1b so as to be swingable as the rotating shaft 4 rotates.

The fixed thread guide 3 and the thread guide lever 6 are arranged in a V-shape, and as the thread guide lever 6 swings, their tips approach and separate from each other, and the thread guide 2 of the fixed thread guide 3 and the thread of the thread guide lever 6 The guides 5 can be located alternately with each other. On the other side of the casing 1, an adjustment handle 7 is fitted into a protrusion 8 of the casing 1b.
The adjustment handle 7 is rotatably pressed against the surface of the case 1a of the casing 1 by the biasing force of a spring 9 similarly fitted into the convex portion 8. A pin 11 is fixed to the extending portion 10 of the adjustment handle 7, and the tip of the pin 11 extends into the inside of the casing 1 through an arcuate slit 12 centered on the convex portion 8 provided on the casing 1a. .

Inside the casing 1, a shaft 13 having the same centerline as the rotating shaft 4 and rotatably fitting the rotating shaft 4 therein.
A pulley 14 is rotatably mounted on the pulley 14, and a coil spring 15 having a biasing force in the contraction direction is mounted surrounding the outer peripheral surface of the pulley 14. One end of the coil spring 15 is fixed to the end of the rotating shaft 4. A U-shaped rod lever 16 which extends along the lower surface of the pulley 14 and whose tip protrudes from the periphery of the pulley 14 and is bent upward is engaged with the tip of a U-shaped rod lever 16, and whose other end is a pin extending from the extension 10 of the adjustment handle 7. 1
1 to form a spring member S. However, as is clear from the above description, the yarn path lever 6 is configured to be able to swing freely together with the rod lever 16 about the rotating shaft 4, but its swing range is limited to the range in which it engages the fixed yarn path 3 and the rod lever 16. It is limited by a stopper pin 17. The stopper pin 17 is provided on the casing 1a so as to protrude into the casing 1, and its tip protrudes into the locus of the swinging rod lever 16. The positions where the lever pins 1 to 17 are provided are the positions where the thread path lever 6 is most open with respect to the fixed thread path 3.

Further, as mentioned above, the pin 11 fixed to the extension part 10 of the adjustment handle 7 extends into the device main body 1 through the slit 12 bored in the device main body 1, so that the rotation angle of the pin 11 is the same as that of the slit 12. Regulated by length.

Further, the adjustment handle 7 is provided with a pointer 18 on the side opposite to the extending portion 10, and a scale 19 is engraved on the surface of the casing 1a of the casing 1 in correspondence with the pointer 18. . 20 is an independent thread guide provided on the lid 1b of the casing 1.

Next, the adjustment of thread tension using this embodiment will be described.

The thread Y passes through an independent thread guide 20 and between the thread guide 2 on the fixed threader 3 and the thread guide 5 on the thread guide lever 6 in a zigzag pattern, and the tension of the running thread causes the thread guide lever 6 to rotate. It rotates together with the shaft 4 and swings in the direction approaching the fixed thread path 3, but as the thread guide lever 6 swings, the rod lever 16 fixed to the rotating shaft 4 also swings, and as a result, the coil spring 15 The coil spring 15 is stretched against the biasing force.
As the biasing force increases, a force in the direction of pulling it back acts on the thread guide lever 6, creating an equilibrium relationship between the tension of the thread and the biasing horn of the coil spring, which always maintains a constant tension on the running thread. can give. Therefore, now turn the adjustment handle 7 into the second position.
When rotating in the direction of arrow B shown in the figure, the coil spring 15 is further stretched against the (=I force), so the biasing force against the yarn guide lever 6 is increased and stronger tension is applied to the running yarn. Therefore, by rotating the adjustment handle 17 left and right to adjust the biasing force of the coil spring 15 depending on the type, thickness, etc. of the running yarn, it is possible to apply the optimum tension to the yarn.

However, the range in which the tension can be adjusted in the first embodiment is limited to the range of the biasing force that can be applied to the coil spring 15 on the spring member S. Therefore, a second embodiment of the device of the present invention, which can further expand the tension adjustment range, will be described below.

Note that the plan view of the second embodiment is completely different from FIG. 1 used to explain the first embodiment, so the plan view of the second embodiment is shown in FIGS. 1 and 5.

Referring to FIG. 6, the same components as those in the first embodiment will be described with the same reference numerals.

Referring to FIGS. 1, 5, and 6, on the lid 1b side of the casing 1, a fixed thread 3 having a thread guide 2 and a thread guide lever 6 are provided facing each other. .

The fixed thread path 3 is screwed to the lid 1b, and the thread path lever 6 has one end pivotally supported by a rotating shaft 4 provided at the center of the variable body 1b so as to be swingable as the rotating shaft 4 rotates. The thread guide 2 of the fixed thread path 3 and the thread guide of the thread threading lever 6 are arranged in a V-shape, and as the thread guide lever 6 swings, their tips approach and separate from each other. 5 can be located alternately with each other. The configuration described above is completely different from the first embodiment.

On the other hand, a rotating shaft 22 is provided on the other surface of the casing 1, and a shaft 23 is fitted on the same axis as the rotating shaft 4, and a wing nut 21 is screwed onto one end of the rotating shaft 22. When the wing nut 21 is tightened, the rotating shaft 22 is prevented from rotating and becomes freely rotatable when loosened. Furthermore, an adjustment handle 7 is fitted onto the shaft 23, and is rotatably pressed against the surface of the casing 1a by the biasing force of a spring 9. Further, a pin 11 is fixed to the extending portion 10 of the adjustment handle 7, as in the first embodiment, and the tip of the pin 11 is attached to the box 1a in an arc-shaped sling 1 centered on the shaft 23. -12 into the interior of the casing 1.

Inside the casing 1, a shaft is located on the same axis as the shaft 13 and on which the rotating shaft 22 is fitted, facing a spring member 3a having exactly the same configuration as the spring member S in the first embodiment. A pulley 24 is rotatably mounted on the pulley 23, and a coil spring 25 having a biasing force in the contraction direction is mounted surrounding the outer peripheral surface of the pulley 24. One end of the coil spring 25 is fixed to the end of the rotary shaft 22, extends over the upper surface of the pulley 24, and has an inverted U-shaped rod lever 26 whose tip protrudes from the periphery of the first pulley 24 and is bent in the F direction. The other end of the spring member sb is engaged with a pin 11 extending from an extension 10 of the adjustment handle 7.

Therefore, both the end of the coil spring 15 of the spring member Sa and the end of the coil spring 25 of the spring member sb are locked to the pin 11, and the rod lever 16. An engaging portion 27 that can be brought into contact is formed.

, and the configuration of other parts in this second embodiment is completely different from the configuration detailed in the first embodiment.

Next, the adjustment of yarn tension using the second embodiment device will be described.

As in the first embodiment, the thread Y passes through an independent thread guide 20 and travels in a zigzag pattern between the thread guide 2 on the fixed thread path 3 and the thread guide 5 on the thread path lever 6. .

First, by loosening the wing nut 21 and rotating the rear thread guide lever 6, which allows the rotary shaft 22 to freely rotate, in the direction of arrow C shown in FIG.
The rod lever 26 is pressed while being in contact with the rod lever 16 at the engaging portion 27, and then when the wing nut 21 is tightened, the rotation of the rotating shaft 22 is blocked and the rod lever 26 stretches the coil spring 25 against the biasing force. The rod lever 16 is rotated away from the rod lever 26 due to the biasing force of the coil spring 15 in the contraction direction, returning the thread guide lever 6 to its old position, and as a result, only the spring member 3a moves the thread. It acts as a biasing force against the lever 6 and takes part in adjusting the tension of the thread.

If it becomes necessary to apply a strong tension to the running yarn that cannot be adjusted by the spring part + a - S a alone, loosen the wing nut 21 and the rotating shaft 22 will be able to rotate freely. The coil spring 25, which has been stretched and held in a fixed state, contracts due to its urging force and rotates the rod lever 26, and the engaging portion 27 causes the rod lever 1 to be rotated.
6, the rod lever 16 swings as the thread guide lever 6 swings due to fluctuations in thread tension, and at the same time the rod lever 26 also swings, causing the coil spring 15 and the coil to move against the thread guide lever 6. The biasing forces of both springs 25 act, and as a result, both spring members Sa and sb cooperate to adjust the tension of the thread. Therefore, according to the second embodiment, it is possible to adjust a much larger tension than when adjusting the thread tension using the spring member Sa alone.

Therefore, according to the second embodiment of the present invention, the adjustable tension range can be greatly changed from the case where only the spring member Sa acts to the case where both the spring members 3a and sb act.

Although the second embodiment has been described using two spring members, it is also possible to use three or more spring members to expand the range in which the tension can be adjusted.

K Effects of the Invention As described in detail above, the thread tension adjusting device of the present invention includes a thread path fixed on one surface of the casing, and a thread path lever whose one end is pivotally supported on a rotating shaft and swings by the biasing force of a spring. are provided facing each other, and the other side is equipped with an adjustment handle for changing the biasing force of the spring. A spring having a biasing force of Since at least one spring member is provided inside the casing,
Due to the tension of the thread passing in a zigzag pattern between the thread guide on the fixed thread path and the thread guide on the thread guide lever, the thread guide lever rotates together with the rotating shaft and swings in a direction closer to the fixed thread path. However, as the thread guide lever swings, the rod lever fixed to the rotating shaft also swings, and as a result, the spring is stretched against the biasing force and the biasing force of the spring increases. A conventional thread tension adjustment device is one in which a force is applied in the pullback direction, creating an equilibrium relationship between the tension of the thread and the biasing force of the spring, resulting in an action that always gives a constant tension to the running thread. Because the device used exclusively the biasing force of the mainspring spring, when adjusting the biasing force, the adjustment knob had to be rotated many times to tighten or loosen the mainspring spring, making it difficult to keep the biasing force constant. In particular, it was difficult to keep the biasing forces of the numerous thread tension adjustment devices attached to the machine table constant, and the biasing forces once adjusted sometimes fluctuated during use. Since the device of the invention is based on a spring member equipped with a spring, it is possible not only to finely adjust the tension, which could not be achieved with the conventional device, but also to adjust the tension of the thread uniformly with ultra-high sensitivity. becomes possible, and of course -H
The force of the spring adjusted by the adjustment handle does not change during use, and the biasing force of the springs of the numerous tension adjustment devices can be easily adjusted by simply aligning the adjustment handle's fingers ↑1 to the scale. can be made constant easily and quickly.

Furthermore, in the present invention, the range in which the tension can be adjusted is greatly expanded by using not only one spring member but also a plurality of spring members. The tension could be easily adjusted.

[Brief explanation of drawings]

Fig. 1 is a plan view of the thread tension adjusting device of the present invention, Fig. 2 is a partially cutaway bottom view showing a first embodiment of the same device, and Fig. 3 is a first embodiment taken along the line ■-■ in Fig. 1. FIG. 4 is a plan view showing the inside of the casing with the lid 1b removed in the first embodiment, and FIG. 5 is a partially cutaway bottom view of the second embodiment of the device of the present invention. Figure, Figure 6 is Figure 1■
FIG. 7 is a partially sectional side view of the second embodiment taken along line -■. S, Sa, Sb...Spring members. 1... Case sink, 3... Fixed thread path. 4.22... Rotating shaft, 6... Thread guide lever. 7... Adjustment handle, 11... Pin. 13, 23...Bearing portion, 14.24...Pulley 15, 25...Coil spring.

Claims (1)

[Claims] 1. On one surface of the casing, a fixed yarn path and a yarn path lever, one end of which is pivotally supported by a rotating shaft and swings by the biasing force of a spring, are provided facing each other, and the other surface is provided with a In the thread tension adjustment device equipped with an adjustment handle that changes the biasing force of the spring, a spring having a biasing force in a contraction direction is mounted around the outer peripheral surface of a pulley rotatably mounted on a shaft. A thread having at least one spring member inside the casing, one end of the spring being engaged with a rod lever fixed to the end of the rotating shaft that fits into the shaft, and the other end being engaged with a pin extending from the adjustment handle. Tension adjustment device. 2. The thread tension adjusting device according to claim 1, wherein the thread guide lever has an end pivotally supported at the other end of a rotating shaft having a rod lever fixed to one end. 3. Inside the main body of the device, a plurality of spring members are provided with shafts positioned on the same axis, and one spring member has a rod lever fixed to one end, and the other end of the rotating shaft supports the end of the thread guide lever. The other spring member has a rotating shaft fixed to one end, and a nut for controlling the rotation of the rotating shaft is screwed to the other end of the rotating shaft, and on the rod lever of each spring member there is a locking mechanism for the rod levers to abut each other. The thread tension adjusting device according to claim 1, wherein a joint portion is provided.