JPH0355575B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a yarn feeding device that makes it possible to remove yarn slack caused by idle feeding and to feed the yarn with light tension.

[Conventional technology]

In conventional flat knitting machines, when feeding yarn Y from the bobbin to the knitting needles of flat knitting machine A as shown in Figure 3, the yarn is hung to take up slack or side Approximately 16 to 18 g of tension is applied to the thread by applying a tension device such as the tension T, top spring S, compensator, spring tension plate, etc., and the carriage C is intermittently reciprocated in the left and right direction until the end of the carrier box B is applied. Yarn was fed to the knitting needles from a feeder (also called a thread opening) provided at the top. When knitting a knitted fabric with knitting width L, carrier box B is knitted with knitting width L.
It was necessary to feed the yarn even more and then turn it back, and when knitting the extra yarn pulled by the sliding movement in the opposite direction, it was necessary to use a spring to tension it so that it would not loosen downward from the basket. Even in circular knitting machines, the threads were kept under tension by springs to prevent them from loosening.

[Problem to be solved by the invention]

When tensioning thread using a spring, the tension of the thread is strong, so it is difficult to use thin or weak thread, and it takes a high level of skill to adjust the tension according to the size and weight of the thread. A problem arose that required further investigation. Particularly on flat knitting machines that feed the carrier box more than the knitting width, the length of yarn that is pulled extra varies depending on the knitting method, so it is very difficult to tension it with a spring, causing dropped stitches. This was causing holes. Furthermore, in the case of high-quality products, where the knitting width is increased according to the body shape as shown in Figure 2 without changing the sliding range of the carrier box, the amount of yarn skip feeding changes as the knitting progresses. There was also a problem in removing yarn slack due to idle feeding. Further, since the reaction force of the spring varies depending on the type of yarn and the degree of knitting, there is a problem in that the strength of the tension varies greatly depending on the difference in the spring reaction force.

The present invention was made in view of the fact that there is a limit to the amount of yarn that can be used for knitting when tensioning the yarn using springs.The purpose of the present invention is to tension the yarn using air suction without using springs. The purpose is to provide a yarn feeding device that is lightly tensioned, and was previously published in Japanese Patent Application Laid-Open No. 62-78242,
The object of the present invention is to improve upon Japanese Patent Application No. 62-99432 and to provide a yarn feeding device that can easily remove slack in the yarn caused by idle feeding.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a yarn feeding device in which an exhaust passage is provided on the inlet side of an insertion hole and an air intake passage is provided on the exit side of the insertion hole, and a nozzle that jets air toward the inlet from the outlet side of the insertion hole is provided. A solenoid valve that is opened and closed by a detector is connected between the nozzle and the compressor, and the nozzle is operated during the return process of empty feed.

[Effect]

The thread passed through the insertion hole is sucked in the return direction by the suction path communicating with the outlet side, and is also sucked in the return direction by the discharge path that discharges air toward the inlet side. Furthermore, when the yarn becomes slack due to idle feeding, air is jetted from the nozzle from the outlet side of the insertion hole toward the inlet, so that the loosened yarn is instantly returned.

〔Example〕

Hereinafter, the structure of the yarn feeding device according to the present invention will be explained based on the drawings of the embodiments. 1. The structure 2 is laminated in parallel with more than the number of yarns required for knitting, and side plates 2a are placed on both sides of the structure.
is attached to the yarn supplying body, and passes through the yarn insertion holes 3 in each of the main bodies 2, 2' constituting the yarn supplying body 1, and
The intake port 4 and the exhaust port 5 are inserted through the intake port 4 and the exhaust port 5 in the stacking direction of the frames 2 and 2' that intersects the insertion hole 3.
One side of the hole is closed by a side plate 2a, and an air constriction part 13 is provided in the middle of the insertion hole 3, and the outlet side from the constriction part 13 is divided into a front insertion part 3a, and the inlet side from the constriction part 13 is divided into a rear insertion part 3b. do. This constricted portion 13 is formed by making a part of the insertion hole 3 smaller in diameter, or by inserting a small cylinder 26 into the insertion hole 3.
The main body 2 has an air intake passage 14 communicating between the front insertion part 3a and the intake port 4, and the exhaust port 5 and the rear insertion part 3b.
Either an exhaust passage 15 is provided to communicate between 5 so that air can be released toward the entrance of the insertion hole 3. In addition, the air intake passage 14 of the main body 2 is provided with a thread reservoir 7 that communicates with the front insertion portion 3a, and the thread reservoir 7 is provided with a ventilation hole 17 for distributing sucked air.
An extraction hole 7a is provided at the bottom to prevent the air sucked into the suction path 14 from the insertion hole 3 from creating a vortex in the thread pool 7, and to prevent the thread Y sucked into the thread pool 7 from forming a vortex.
While the threads are prevented from being twisted or entangled, thread waste can be sucked through the extraction hole 7a. Air vents 6 and 16 are provided in the intake and exhaust passages 14 and 15, respectively, so that the amount of air passing through the intake and exhaust passages 14 and 15 can be finely adjusted by the air vents 6 and 16.

Reference numeral 8 denotes a nozzle provided at the outlet side of each insertion hole 3. The nozzle 8 is provided in an inclined state so that air can be jetted from the front insertion part 3a toward the inlet. 18
The solenoid valve 19 is connected to each of the hoses 28. The solenoid valve 19 includes valve close detectors 9a and 9b that detect when the carriage C reaches both ends of the knitting width L, and valve open detectors 9c and 9d that detect the turning point of each carrier box B.
is connected. Valve closure detectors 9a and 9b are mainly attached to the bobbin support base, and close all solenoid valves 19 when the passage of carriage C is detected, and valve open detectors 9c and 9d are mainly attached to the stopper of each carrier box B. When the carrier box B reaches the stopper, the solenoid valve 19 provided in the nozzle 8 of the insertion hole 3 corresponding to the carrier box B is opened, and air is jetted out from the nozzle 8 during the return stroke of the empty feed. do.

10 is a yarn feeding device provided in front of the yarn supplying body 1;
The feeding device 10 pivotally supports upper and lower rollers 11 and 12, slips and rotates until the yarn Y is used, and moves the yarn Y through the insertion hole 3 of the yarn feeder 1 from the upper roller 11 according to the knitting.
Feed yarn Y to . 30 is an air supply/intake blow connected to the yarn supply body 1; the air supply/intake blow 30 includes an intake hose 31 connected to the intake port 4 of the yarn supply body 1; an exhaust hose 32 connected to the exhaust port 5 of the yarn supply body 1; An air supply port 33 for blowing air from the entrance to the exit of the insertion hole 3 is provided, and a 31 filter 36 is connected to the intake side of the air supply/intake blow 30.

Reference numeral 20 denotes a yarn breakage detector attached to the front of the yarn supplying body 1. The detector 20 is attached to an arm 25 extending forward from the yarn supplying body 1. Pass the yarn Y to be fed, and
The movable piece 21 is floated from the contact point 22 under the tension of
The yarn breaks and contacts the contact point 22, and the flat knitting machine A is stopped, the air supply/intake blow 30 is stopped, and the broken yarn Y is instantly sucked into the intake port 4 from the front insertion part 3a. It is desirable that the yarn feeder 1 to which the yarn feeding device 10 and the yarn breakage detector 20 are attached is provided on a carriage 35 that can move and fix both the air supply and intake blow 30.

Since the yarn feeding device of the present invention has the above structure, when used in a flat knitting machine A, it is placed on the side of the flat knitting machine A as shown in FIG.
0, and an exhaust hose 32 to the exhaust port 5, and the compressor 18 connects the yarn feeder 1 to the
A hose 28 is connected to each nozzle 8 provided in the insertion hole 3, and the air supply/intake blow 30 and compressor 18 are operated together with the flat knitting machine A.

In order to pass the yarn Y through each insertion hole 3 of the yarn feeder 1, first suction from the intake port 4 by the air supply/intake blow 30,
After blocking the exhaust to the exhaust port 5 and stopping the suction and exhaust to the insertion hole 3, one thread tip is put into the entrance of one insertion hole 3 from the yarn feeding device 10, and from the entrance of the insertion hole 3 to the exit. After blowing air through the air inlet 33 of the blow 30 and passing the yarn Y through the insertion hole 3, the yarn Y passed through the insertion hole 3 is passed through the movable piece 21 of the detector 20, and stretched to the knitting needle. do. The other yarns Y are passed one by one through each insertion hole 3 of the yarn supplying body 1 by the same means, and each yarn Y is passed through the movable piece 2 of the detector 20.
Pass it through.

When the air supply/intake blow 30 is started in the above state, air is sucked through the intake port 4 of the yarn supplying body 1, and the air is discharged from the exhaust port 5 of the yarn supplying body 1. Since the intake port 4 communicates with the front insertion part 3a via the intake path 14, air is sucked into the intake port 4 from the front insertion part 3a, and the thread Y is pulled in the return direction by the suction air flow. On the other hand, the exhaust path 1 communicating with the exhaust port 5
5 opens toward the entrance of the insertion hole 3, so the yarn Y is also pulled in the return direction by the air flow released from the exhaust path 15. Insertion hole 3 of yarn supplying body 1
The tension of the thread Y passed through can be adjusted by adjusting the amount of suction from the front insertion part 3a by an air vent 6 provided in the intake path 14, or by adjusting the amount released by using an air vent 16 provided in the exhaust path 15. Alternatively, by adjusting the amount of air passing through both air vents 6 and 16, 3 to 6
You can be as tense as g.

On the other hand, the air forcedly sent from the compressor 18 toward each nozzle 8 is closed by the solenoid valve 19 corresponding to each nozzle 8, but when the carrier box B reaches the turning point, the valve open detectors 9c and 9d
When the solenoid valve 19 is activated, the solenoid valve 19 opens and air is vigorously jetted from the nozzle 8 toward the entrance of the insertion hole 3. A part of the air jet ejected from the nozzle 8 is discharged from the entrance of the insertion hole 3, and a part is sucked into the intake port 4 through the air intake path 14, so that the thread Y passed through the insertion hole 3 is absorbed into the air jet. Therefore, the suction passage 14 is pulled in the return direction, and the slack of the yarn Y caused by the idle feeding is communicated with the front insertion part 3a.
The yarn is sucked into the suction passage 14 and collected in the yarn reservoir 7 provided in the suction path 14. When the solenoid valve 19 is opened by the valve open detectors 9c and 9d, the carriage C is activated by the valve close detector 9.
When it reaches points a and 9b, it closes, stopping air jetting from the nozzle 8, and preventing a large tension from being applied to the yarn Y.

It should be noted that the yarn feeding device of the present invention is not limited to the above structure, and for example, the positions of the intake port 4 and the exhaust port 5 relative to the frame 2 may be provided above or below the insertion hole 3. reach your goal. Also, a hose 28 is branched and connected from the compressor 18 to the nozzle 8 provided in each insertion hole 3, and a solenoid valve 19 is connected to each nozzle 8.
The valve open detectors 9c and 9d of the carriage C corresponding to the insertion hole 3 of the nozzle 8 are connected to each solenoid valve 19, while the valve close detectors 9a and 9b are connected to all the solenoid valves 19 in common. The same purpose can be achieved even if the threads are connected together, and since the yarn supplying body 1 is constructed by laminating the frame bodies 2, yarn supplying bodies 1 having different numbers of threads inserted can be freely configured.

〔Effect of the invention〕

Since the yarn feeding device of the present invention is configured as described above, it produces the effects described below.

The yarn is passed through the insertion hole of the yarn feeder, and the outlet side of the insertion hole is communicated with the suction side of the air supply/intake blow, and the suction air pulls the yarn in the return direction, while air is supplied to the entrance side of the insertion hole. Since the exhaust side of the blower is connected and the exhaust air released toward the inlet side pulls the yarn in the return direction, the tension of the yarn can be reduced to less than 6g, making it difficult to use in the past. To enable even thin threads or weak threads to be used without thread breakage, and to enable high-speed knitting of weak threads. In addition, the thread waste attached to the threads is sucked into the intake port through the holes in the thread pool, reducing knitting losses and defective products, thereby stably supplying high-quality, uniform knitted fabrics with good texture. can. In particular, even if yarn breaks during knitting, the yarn returns instantly due to the airflow, so air blowing and knitting machines can be stopped faster than with spring-type systems, and recovery is also easier. Even if the yarn becomes slack, the air flow and the air ejected from the nozzle are instantly sucked up by the jet, making it possible to knit uniformly without unevenness. Needless to say, it has a practical effect as a yarn feeding device that feeds yarn with a constant tension.

[Brief explanation of drawings]

FIG. 1 is a usage state diagram of the yarn feeding device according to the present invention;
Figure 2 is a front view of the knitted product, Figure 3 is a front view of the flat knitting machine, Figures 4, 5, and 8 are longitudinal sectional views of main parts showing examples of the structure of the yarn pool, and Figure 6 is a front view of the flat knitting machine. FIG. 7 is a cross-sectional view showing an example of the structure of the air intake passage, FIG.
Figure 0 is a side view showing an example of the connection of the air supply/intake blow.
FIG. 1 is a schematic view showing an example of air supply from a nozzle, and FIG. 12 is a front view showing an example of use of the yarn feeding device of the present invention. DESCRIPTION OF SYMBOLS 1... Yarn feeder, 2... Body, 2a... Side plate, 3... Insertion hole, 3a, 3b... Insertion part, 13... Throttle part, 4... Intake port, 14... Intake path, 5... Exhaust port, 15... Exhaust path , 6, 16...air vent, 7...thread pool, 7a...bleed hole, 17...vent hole, 8...nozzle, 18...compressor, 9a, 9b...valve closure detector, 9c, 9d
...Valve open detector, 19... Solenoid valve, 10... Yarn feeding device, 20... Yarn breakage detector, 21... Movable piece, 22...
Contact, 30... Air supply/intake blow, 28, 31, 32...
Hose, 33...Air supply port, 35...Dolly, A...Flat knitting machine, B...Carrier box, C...Carriage, 3
6...Filter, P...Computer, R...Guide rail, S...Top spring, T...Side tension,
Y... Thread.

Claims (1)

[Scope of Claims] 1. The thread Y passes through the insertion hole 3 in the yarn supplying body 1, and is provided with an intake port 4 and an exhaust port 5, and an intake path 14 is communicated with the intake port from the middle part of the insertion hole. An exhaust passage 15 opens toward the entrance from the exhaust port on the entrance side of the hole.
On the other hand, a nozzle 8 for jetting air toward the inlet is provided in the front insertion part 3a on the outlet side from the connection part of the intake passage, and an air supply/intake blow 30 is connected between the intake port and the exhaust port. Compressor 1
Yarn feeding device with air flow connected to 8. 2. A solenoid valve 19 is provided between the nozzle 8 and the compressor 18, and valve closure detectors 9a and 9b are activated when the carriage C passes through the solenoid valve, and valve open detection is activated at the turning point of the carrier box B. 2. The yarn feeding device using air flow according to claim 1, wherein the yarn feeders 9c and 9d are connected to each other.