JPS61239062A - Yarn feeder of automatic circular knitting machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Field of Industrial Application) This invention is directed to a yarn feeding device of an automatic circular knitting machine, specifically, a yarn feeding device disposed between a knitting unit and a bobbin wound with yarn as a knitting material. This invention relates to a yarn feeding device.

(Prior Art) Yarn supplied to the knitting section of an automatic circular knitting machine is wound around a bobbin, and is unwound from the bobbin as the braiding acid operates. In such a knitting machine, there is a step of knitting ultrafine rubber thread as a knitting material.

Rubber thread has the property of stretching when tension is applied. If stretched rubber thread is knitted, uneven knitting will occur, so when feeding it, use a thread feeder to forcibly unwind it from the bobbin to prevent tension exceeding a predetermined value from being applied. It is then supplied to the editing department.

It is also conceivable to operate the yarn feeding device only when a tension of a predetermined value or more is generated in the yarn.

(Problem that ellR tries to solve) In conventional yarn feeding devices, if the yarn feeding speed in the device and the knitting speed in the knitting section do not completely match, there will be a problem between the device and the knitting section. The thread stretches or becomes loose. There are problems in that when the thread stretches, thread breakage occurs frequently, and when the thread becomes slack, the loosened thread becomes entangled with surrounding members. Although it is technically possible to adjust the yarn feed speed with high precision, the device is expensive and there remains a problem in terms of cost. Furthermore, when the yarn feeding device is operated only when excessive tension occurs, the yarn under tension will be knitted if the yarn feeding is not started quickly. There is a problem.

(Means for Solving the Problems) The present invention is an automatic system with a simple structure, easy speed adjustment, and quick start-up that operates to eliminate the tension only when a tension exceeding a predetermined value is generated in the thread. A thread feeding device of a circular knitting machine that engages the thread pulled out from the bobbin,
a tension detection means that is activated to output a tension generation signal when a tension of a predetermined value or more is generated in the thread between the knitting component and the bobbin; a feed roller which is placed in close proximity and constantly rotates in the yarn pay-out direction at a speed faster than the knitting speed of the knitting composition section; a movable guide member, driven by a tension generation signal from the tension detection means, and a drive means for moving the movable guide member in a direction that brings the thread between the tension detection means and the bobbin into pressure contact with the circumferential surface of the feed roller; It consists of a thread feeding means.

(Function) The thread pulled out from the bobbin is guided to the knitting section via the tension detection means. When a problem occurs in drawing out the thread from the bobbin, tension is generated in the thread between the bobbin and the knitting component, and when the value of this tension exceeds a predetermined value, the tension detection means issues a tension generation signal. This signal activates the yarn feeding means, and the movable guide member presses the yarn against the circumferential surface of the feeding roller. As a result, the thread 5 is forcibly pulled out from the bobbin and its tension is released.

When the tension in the yarn is eliminated, the tension detection means cancels the tension generation signal, stops the operation of the yarn feeding means, and releases the pressure contact between the yarn and the feed roller.

(Example) Hereinafter, the present invention will be described in detail based on the illustrated example.

First, the present invention will be explained in detail with reference to FIG.

In the figure, reference numeral 1 indicates a well-known knitting unit of an automatic circular knitting machine, and reference numeral 2 indicates a bobbin around which a thread 3 made of a thin rubber thread is wound. The yarn pulled out from the bobbin 2 is guided to the knitting section 1 via a tension detection means 4. Bobbin 2
The thread 3A between the knitting part 1 and the knitting part 1 is engaged with a guide part 6 formed by bending at one end of the detection lever 5.
It has a nearly right angle. The tension detection means 4 includes a detection lever 5. It consists of a sensor 7 and a spring 8 as a biasing means. Between the bobbin 2 and the tension detection means 4,
Yarn feeding means 9 are arranged.

Each structure will be explained based on FIGS. 2 to 6.

The detection lever 5 is formed by bending a steel wire,
The Daruma-shaped annular portion 10 formed at the base end of the substrate 1
The support shaft 12 is pivotably engaged with a support shaft 12 co-located on the surface of the support shaft 1. A bearing 13 made of synthetic resin is fitted onto the support shaft 12, and the annular portion 10 is elastically engaged with a groove 13a of the bearing 13. The detection lever 5 is bent at a substantially right angle, and a light shielding member 14 is fixed to the bent portion.

The sensor 7 includes a light emitting element and a light receiving element, which are arranged on the movement trajectory of the light shielding member 14.

The sensor 7 is fixed to the surface of the substrate 11 by a bracket 15. This sensor 7 is turned on when the detection lever 5 moves from a home position, which will be described later, and outputs a tension generation signal. Bracket 15
A lever guide 16 is fixed to the lever guide 16 for reliably returning the detection lever 5, which has been swung due to excessive tension generated in the thread, to its home position.

One end of a spring 8 is locked near the base end of the detection lever 5. The other end of the spring 8 is locked to a pin 17 that is flush with the surface of the substrate 11. The spring 8 gives the swingable detection lever 5 a swinging habit toward a position where its light blocking member 14 blocks the optical axis of the sensor 7 . The elasticity of the spring 8 is set to be slightly larger than the normal thread pulling force that is applied to the detection lever 5 and is associated with the knitting operation of the knitting section 1 . Therefore, when a tension of less than a predetermined value is applied to the thread, the detection lever 5 is activated by the elasticity of the spring 8.
The light shielding member 14 is swung to a home position (solid line position in FIG. 1 and FIGS. 2 and 3) where the sensor 7 is turned off.

The thread feeding means 9 is arranged in the thread passage between the bobbin 2 and the guide section 6, and is connected to the feeding roller 18.degree. drive motor 19. Pinch roller 20 as a movable guide member, fixed thread guide 21. It consists of a driving means 22. The feed roller 18 is made of a resin such as polyacetal, and is arranged on the front side of the substrate 11, and is constantly rotated in the direction of the arrow by a drive motor 19 fixed on the back side of the substrate.

The speed of the drive motor I9 is adjusted by operating a speed WRa device (not shown), and the drive motor I9 is
8 is rotationally driven at a speed faster than the yarn composition speed in the knitting section 1.

The pinch roller 20 is made of a high-friction elastic material such as rubber, and is rotatably supported by a support shaft 23 passing through a hole 11a formed in the substrate 11. The support shaft 23 is fixed to a support lever 25 that is swingably supported about a shaft 24 that is equivalent to the back surface of the substrate 11 . One end of a spring 26 is locked to the support lever 25 . Spring 2
The other end of the pinch roller 20 is attached to the support lever 25 by the elasticity of a spring 26 that is locked to a pin 27 that is attached to the substrate.
The movement behavior is given in the direction of moving away from 8. The movement behavior of the support lever 25 is regulated by the support shaft 23 abutting against the edge of the hole 11a. When the movement of the support lever 25 is restricted, the pinch roller 20 has its circumferential surface spaced apart from the circumferential surface of the feed roller 18, as shown in FIG. Feed roller 18 and pinch row
It is desirable that the distance between the circumferential surfaces of the rollers 20 is set as small as possible to the extent that normal movement of the yarn 3A is not hindered.

The fixed thread guide 21 has a guide member 28 made of a material with low friction and excellent wear resistance, for example, ceramic, through which the thread pulled out from the bobbin 2 is passed, at one end of the fixed thread guide 21. As shown in FIG. 3, this guide member 28 guides the thread 3A between the guide portion 6 of the detection lever 5 and the bobbin 2 so that it passes between the circumferential surfaces of both rollers 18 and 20 facing each other. The position has been set as desired. The base end of the fixed thread guide 21 is fixed to the surface of the substrate 11 by a screw 29.

The driving means 22 includes a solenoid 30 fixed to the back surface of the substrate 11 via a bracket (not shown) and the lever 25 described above. The actuator 31 of the solenoid 30 is pivotally attached to the support lever 25 by engaging a pin 32 with an elongated hole 25a formed at one end of the support lever 25. Actuator 31 is adapted to retract when solenoid 30 is energized. The solenoid 30 is actuated by the tension generation signal issued by the tension detection means 4, and the actuator 31 is retracted to swing the support lever 25 against its tendency to press the pinch roller 20 against the feed roller 18. It is turned off by canceling the tension generation signal of the tension detection means 4.

The operation of the embodiment of the present invention configured as above will be explained.

As shown in FIG. 1, the thread 3 pulled out from the bobbin 2 is pulled through the guide member 28 of the fixed thread guide 21 and hooked on the guide part 6 of the detection lever 5, and then is passed through the knitting part 1.
is being supplied to. The thread 3 is unwound from the bobbin 2 as the knitting section 1 performs the knitting operation. thread 3 from bobbin 2
When the yarn 3A is unraveled smoothly, the tension below the predetermined value associated with the movement of the knitting part is applied to the thread 3A between the bobbin 2 and the knitting part 1, as shown by the solid line in FIG. , fixed thread guide 21. It is guided through the guide section 6.

At this time, the detection lever 5 is located at the home position shown in FIG. 3 due to the elasticity of the spring 8, and the sensor 7 is turned off. Since the solenoid 30 is turned off, the pinch roller 20 as a movable guide member
is placed at a position spaced apart from the feed roller 18 (see reference numeral 20A in FIG. 5 and FIG. 3). Therefore, the thread 3A between the guide member 28 and the guide section 6 is moved between the feed roller 18 and the pinch roller 20.

Now, assume that the thread 3 is no longer smoothly unwound from the bobbin 2 due to the threads getting entangled with each other.

Since tension is applied to the yarn 3A between the bobbin 2 and the knitting part 1 due to the knitting part operation, the yarn 3A is gradually elongated. When the tension of the stretched thread exceeds the elasticity of the spring 8, the thread 3A causes the detection lever 5 to swing as shown by the broken line in FIG. When the tension of the thread 3A exceeds a predetermined value, the detection lever 5 is pulled by the thread and swings counterclockwise about the support shaft 12, as shown in FIG. When the light blocking member 14 moves from the position where it blocks the optical axis of the sensor 7, the sensor 7 is turned on and the tension detection means 4 issues a tension generation signal. This tension generation signal is transmitted to the solenoid 30 via a control circuit (not shown). When the solenoid 30 is turned on, the actuator 31 retracts and swings the support lever 25 counterclockwise about the support shaft 24. When the support lever 25 swings, the pinch roller 20 supported by it is moved by 1 force, and its circumferential surface contacts the circumferential surface of the feed roller 18, which is rotating in the direction of the arrow, and is driven to rotate. (See solid line 20 in FIG. 5 and FIG. 7). Due to the contact between both rollers 18 and 20,
The thread 3A was drawn between the two.

It is held between both rollers. The thread held between the two rotating rollers is forcibly pulled out from the bobbin 2. Since both rollers are rotated at a speed faster than the knitting speed of the knitting section 1, the yarn 3A held between them can reach a predetermined value of the yarn as shown by the chain line in FIG. In order to eliminate the above tension, it is rapidly fed toward the knitting section 1.

As the excessive tension in the thread 3A is eliminated, the detection lever 5 swings toward the home position where the sensor 7 is turned off by the elasticity of the spring 8. When the thread tension becomes less than a predetermined value, the detection lever 5 turns off the sensor 7 and cancels the tension generation signal, as shown in FIG. sensor 7
When the solenoid 30 is turned off, the current to the solenoid 30 is cut off, and the small tension action on the support lever 25 is released. As a result, the pinch roller 20 is returned to its original position as shown in FIG. 3 (in the dashed line position in FIG. do. The time during which the solenoid 30 is on, in other words, the time t during which the yarn is fed by both rollers 18 and 20, is the time required for the excessive tension generated in the yarn 3A to be eliminated. It is better to eliminate the excessive tension generated in the yarn as soon as possible, so the feed roller 18 and the pinch roller 2
Pinch roller 2 is used in order to set the mutual spacing between 0 and 0 as small as possible and to reduce the load on the solenoid 30.
It is desirable that the movable parts such as 0 etc. be lightweight.

As described above, when a tension of a predetermined value or more is generated in the thread, this is detected by the detection lever 5 and the sensor 7, and the tension is eliminated by feeding the thread with the thread feeding means 9.

The yarn feeding action is repeated every time a tension of a predetermined value or more is generated in the yarn.

It is desirable to detect the tension generated in the thread as sensitively as possible. In this regard, in this embodiment, since the detection lever 5 is swingably supported by the support shaft 12, even minute excessive tensions can be detected. In order to detect overtension, it is not particularly necessary to provide elasticity to the detection lever 5, but M3
In order to prevent yarn breakage due to shock absorption when excessive tension in A suddenly occurs, it is more effective to provide elasticity.

FIG. 8 shows different examples of detection levers. FIG. 5(a) shows an example in which the guide portion 6A is provided in the middle portion of the detection lever 5A, and FIG. 2(b) shows an example in which the detection lever 5B is bent into a hairpin shape. In the figure (a), since the lever ratio is set large, a minute overtension can be detected, and in the figure (b), the length of the substrate 11 can be shortened. 8th
Although each figure shows an example in which the detection lever is formed from a steel wire, the detection lever shown in FIG. 2(a) may also be formed from a plate material. When the detection lever is made of steel wire, it is extremely easy to attach and detach it from the support shaft. Further, a guide member having high wear resistance may be provided in the guide portions 6, 6A.

Next, referring to FIG. 9, another embodiment of the present invention will be described. This embodiment is characterized by the structure of the movable guide member.

A fixed guide 210 that guides the thread 3A between the tension detection means 4 and the feeding means 90 (not shown) is fixed on the upper surface of the substrate 110.

A feed roller 180 made of a high friction material such as rubber is arranged on the upper surface of the substrate 110.

The roller 180 has its circumferential surface positioned on the side of a locus (3B) along which the thread 3B normally moves between the fixed guide 210 and a bobbin (not shown). feed roller 180
is constantly rotated in the direction of the arrow by a drive motor 190 fixed to the bottom surface of the substrate. This roller 1
It goes without saying that the knitting section 80 is rotationally driven at a speed higher than the knitting speed of the knitting section 1. A movable guide member 250 is provided on the lower surface of the substrate 110 so as to be swingable around a support shaft 240 . A bent portion 200 is formed at one end of the movable guide member 250 to which a guide member 280 through which the thread 3B is drawn is fixed. This bent portion 200 passes through a long hole 110a formed in the substrate 110 and protrudes from the upper surface of the substrate. The guide member 280 faces the circumferential surface of the feed roller 180, and both guides 210, 2
The yarn drawn through 80 is made to correspond to the circumferential surface of the feed roller 180. The movable guide member 250 includes a spring 260.
The clockwise rocking behavior is given by This swinging behavior is regulated by the bending portion 200 abutting against the edge of the elongated hole 110a. At the other end of the movable guide member 250, an actuator 310 of the solenoid 300 is provided.
is pivoted. This solenoid 300 is turned on by a tension generation signal from the sensor 7 and the detection lever 5 (see FIG. 1). If the tension of the thread unwound from the bobbin is less than a predetermined value, the sensor 7 will not output a tension generation signal, so the movable guide member 250 is at the solid line position, and the position where the thread is separated from the feed roller 180. When the tension generation signal is issued, the solenoid 300 turns on and pulls the actuator 310 to swing the movable guide member 250 counterclockwise. As the movable guide member 250 swings, its bent portion 200 is moved to the chain line position. Then, the guide member 280
A portion of the thread 3B that has been drawn through the fixed guide 210 is brought into pressure contact with the circumferential surface of the feed roller 180. At this time, since the feed roller 180 is rotated in the direction of the arrow, the thread 3B pressed against it is forcibly unwound from the bobbin 2 due to the friction of the roller, and the thread 3B is forcibly unwound from the bobbin 2 (see FIG. 1). sent towards. When the excessive tension in the thread is eliminated by feeding the thread, the detection lever 5 returns to the home position and the sensor 7 is turned off. When the sensor 7 is turned off, the tension generation signal of the tension detection means is canceled and the solenoid 300 is turned off. As a result, the movable guide member 250 returns to the solid line position and separates the thread 3B from the circumferential surface of the feed roller 180.

The yarn feeding operation by the feed roller 180 and the movable guide member 250 is repeated every time a tension of a predetermined value or more is generated in the yarn. Although FIG. 9 shows an example in which only one movable guide member is provided facing the feed roller 180,
If the fixed guide 210 is also made movable, the winding angle between the thread 3B and the feed roller 180 can be made larger when excessive tension occurs, so that the thread can be fed more reliably.

(Effects of the Invention) As described above, the thread is forcibly removed from the bobbin using a relatively simple structure that only presses the thread against the constantly rotating feed roller when tension of a predetermined value or more is generated in the thread. According to the present invention, in which the above-mentioned tension is canceled by pulling out the yarn, the start-up of the yarn overtension eliminating operation is quick, and the speed of yarn feeding and the knitting composition speed in the knitting composition part are adjusted with high precision. This allows thread feeding without thread breakage.

[Brief explanation of drawings]

Fig. 1 is a perspective view schematically showing an embodiment of the thread feeding device of an automatic circular knitting machine of the present invention, Fig. 2 is an exploded perspective view showing an embodiment of the thread feeding device, and Fig. 3 is the same as the above. FIG. 4 is a front view, FIG. 4 is a side view of the same as above, FIG. 5 is a bottom view of same as above, and FIG. 6 is an enlarged view showing an example of the detection lever. FIG. 7 is a front view showing the action of FIG. 3 and shows the yarn feeding operation, FIG. 8 is a front view showing different examples of the detection lever, and FIG. 9 is a perspective view showing another embodiment of the present invention. It is a diagram. DESCRIPTION OF SYMBOLS 1...Knitting part, 2...Bobbin, 3...Thread, 4...
...Tension detection means, 9... Yarn feeding means, 18...
・Feed roller, 20,250...movable guide member,
30,300...Solenoid. Figure 1 Figure 2 Figure 5 Figure 9 Figure δ Figure

Claims (1)

[Scope of Claims] A yarn feeding device that is disposed between a knitting section of an automatic circular knitting machine and a bobbin on which yarn is wound, and guides yarn supplied from the bobbin to the knitting section, the bobbin a tension detection means that engages with the yarn pulled out from the yarn to detect the tension of the yarn supplied to the knitting section, and outputs a tension generation signal when a tension of a predetermined value or more is generated in the yarn; A feed roller that keeps the yarn between the means and the bobbin close to its peripheral surface and constantly rotates in the yarn payout direction at a speed faster than the knitting speed of the knitting component; A movable guide member placed in between and facing the feed roller is actuated by a tension generation signal from the tension detection means to press the thread between the tension detection means and the bobbin against the peripheral surface of the feed roller. A yarn feeding device for an automatic circular knitting machine, comprising a yarn feeding means comprising a driving means for moving the movable guide member in the same direction.