JPH02307943A - Fiber-feeding and drawing device - Google Patents

Abstract

PURPOSE:To prevent the torsion of a fiber and simplify the structure of the subject device by disposing a fiber-pulling mechanism, a fiber-drawing mechanism, a fiber-holding device and a fiber-pressing device between a pair of fiber clampers to reduce the mechanically moving portions thereof. CONSTITUTION:A fiber l is held with a pair of clampers 2a, 2b, pressed between a pair of fiber-holding devices 7 with the guide roller 81 of a fiber-pressing device 8 and subsequently cut with a cutter 4. The fiber is pulled in the cavity 52 of a guiding box 51 with a blower nozzle 56 and, when the free end of the fiber reaches near the fiber-holding device 7, the amount of the blown air from the air blower 56 is reduced and a fiber-drawing mechanism 6 is operated to pull the fiber in the fiber-pulling hole of a dropper, heald or reed.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a yarn supply and pull-through device for pulling yarn through thread-through holes such as heddles, healds, droppers, reeds, etc. in a weaving fabric preparation process.

(b) Prior Art The woven fabric preparation process involves drawing the warp threads through each threading hole of the heald, dropper, or reed. Various devices have been developed for performing such operations, and one of the newer devices is a "yarn supply device" described in Japanese Patent Laid-Open Publication No. 63-315647. As shown in FIG. 12, the device described in this publication uses a cutter C to cut one end of the thread l stretched between the thread tensioning beams a and b, and then the device is installed near the cutter C. warp chuck d,
A warp holding hook e provided approximately midway between both beams a and b allows the warp portion from the warp holding hook e to its own end cut by the cutter to be captured by a long suction installed along the yarn elongation direction. Suction is made into the suction chamber in the box through the slit, and then the warp threads are pulled down by the warp thread pull-down hook g moving along the suction box f to guide the free end of the warp threads near the drawing hole of the heald i. It is something.

However, this device has a relatively large number of purely mechanical moving parts to move the yarn, which not only makes the mechanism complicated and increases the cost of the device, but also limits the ability to increase the processing speed. Furthermore, since the structure is such that the free end portion of the warp yarns is sucked into the suction chamber through the slit of the suction box, a large amount of vacuum capacity is used, resulting in a problem of large energy consumption.

(C) Problems to be Solved by the Invention The problems to be solved by the present invention are to reduce the number of mechanically operating parts in the thread supply and drawing device as much as possible, thereby increasing the speed of the thread drawing operation.

The goal is to reduce air consumption and improve efficiency.

(d) Means for Solving the Problems The present invention comprises a pair of yarn clampers that hold the yarn at two positions spaced apart by a desired distance, and a pair of yarn clampers that are provided close to one of the yarn clampers to hold the yarn. In a yarn supplying and pulling device that includes a cutter that cuts the yarn and passes the yarn cut by the cutter into a threading hole of a heald, dropper, reed, etc., a blower nozzle that sprays air pressure onto the yarn is located near the other yarn clamper. and a thread guide box for accommodating the loosened part of the thread blown by the blower nozzle, with the chain thread in between. A thread-drawing block is provided which is movable in a direction substantially perpendicular to the direction in which the chain thread extends, and is provided with a nozzle hole for blowing compressed air and a thread guide groove for guiding the thread into the opening of the nozzle hole. A yarn gripping device for gripping the chain yarn with a force smaller than the force used to pull the yarn by the blower nozzle and a yarn pushing device for causing the yarn gripping device to grip the yarn are installed at a position on the side of the one yarn clamper. It is configured by being placed in between.

(e) Function In the above configuration, the thread is clamped in a tensioned state by the pair of thread clampers, and the thread is pushed into the thread gripping device by the thread pushing device to be held. Next, after cutting with a cutter, pressurized air is blown toward the guide box using a blower nozzle, and the thread is blown into the guide box with the middle part slackened by the action. At this time, since the thread is held by the gripping device, it is pulled against the gripping force of the gripping device, so that the free end of the yarn cut by the cutter is drawn toward the gripping device. When the free end of the thread comes close to the gripping device, the structure of the guide box stops the blowing of the thread into it, even with air blown from the blower nozzle. In this state, when the blowing pressure from the blower nozzle is lowered and the thread threading block is moved, the thread approaches the threading hole of the heald, dropper, etc. while being guided to the open end of the nozzle hole by the action of the guide groove. At this time, the part near the free end of the yarn is gripped by the gripping device, and the guide box side tends to be constantly blown into the guide box by the air flow from the blower nozzle (with a smaller force than at the beginning).
acts on the thread, so a constant tension always acts on the thread. Finally, when the thread threading block approaches the threading hole, compressed air is blown from the nozzle hole to draw the thread through the threading hole.

(F) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a thread supplying and drawing device 1 of this embodiment is shown. This device 1 includes a pair of yarn clampers 2a and 2b of a known structure arranged apart from each other for holding a linearly stretched yarn l at two separate locations, and one yarn clamper 2.
A leeching unit 3 of a known structure is provided in the vicinity of the leeching unit 3, and a cutter 4 is provided in the vicinity of the leeching unit 3 and cuts the yarn gripped by the yarn clampers 2a and 2b. A thread pulling mechanism 5 that is provided close to each other and pulls the thread, a thread pulling mechanism 6 that is provided close to the cutter 4 side of the thread pulling mechanism 5, and a thread pulling mechanism 6 that is provided close to the cutter 4 side of the thread pulling mechanism 6. A thread gripping device 7 and a thread pushing device 8 are provided.

The thread pulling mechanism 5 has a thin box-shaped guide box 51 that extends in a direction substantially perpendicular to the stretching direction of the thread i, and a blower nozzle 56 that blows compressed air toward the inside of the guide box. are placed facing each other. Information box 51
As shown in FIG. 4, there is a cavity 52 with different widths at the top and bottom.
is formed, and the front end of the string of the cavity 52 is open to the outside, and the rear end (the right end in the figure) is closed. A large number of air vent holes 5 are provided on the rear end side of the guide box 51 and communicate with the cavity 52.
3 is formed. Near the center of the lower side of the information box 51,
As shown in FIG. 5, one or more auxiliary nozzle holes 54 are formed to blow compressed air toward the rear end. A nozzle hole 57 is formed in the blower nozzle 56 for blowing compressed air into the lower part of the cavity 52 of the guide box 51.

The thread-pulling mechanism 6 includes a guide rod 61 extending in a direction substantially perpendicular to the stretching direction of the stretched thread l, a thread-pulling block 62 movably supported by the guide rod 61, and a cylinder 68 that moves the thread-pulling block. It is equipped with

As shown in FIGS. 6 to 8, the thread drawing block has a cubic shape, and has a nozzle hole 64 that opens on the front surface 63 on the left side of the thread, and a cross section V that positions the thread at the open end of the nozzle hole 64. A shaped guide groove 65 is formed.

The nozzle hole 64 is adapted to be connected via a through hole 66 to a source of pressurized air (not shown).

As shown in FIG. 9, the thread gripping device 7 holds disks 71 and 72, each having annular convex portions 73 and 74 defined by a pair of conical surfaces, on a spindle 75 with the convex portions facing each other. The disc 72 is rotatably attached to the other disc 72 by a spring 76.
oppressed by the side. By gripping the thread between the convex portions 73 and 74, a certain degree of resistance is applied to the tension acting on the thread.

This resistance force can be adjusted by adjusting the strength of the spring 76, and is adjusted to be smaller than the force with which the blower nozzle 56 blows the yarn into the guide box. As is clear from FIG. 6, the disks 71 and 72 are arranged at positions aligned with the guide grooves formed in the thread-pulling block 62.

The thread pushing device 8 is composed of a guide roller 81 that engages with the thread l and pushes the thread between a pair of disks 71 and 72, and a cylinder 82 that pushes the guide roller 81. In addition, 5 is a guide rod provided at the open end of the cavity 52 of the guide box 51, 6 is a guide rod for thread pulling in front of the guide box, and b is a beam around which the thread 1 is wound.

In the apparatus having the above configuration, the yarn ρ is moved by the yarn clampers 2a and 2b.
While gripping the thread l, the guide roller 81 of the thread pushing device 8 is pushed out to push the thread l between the pair of disks 71 and 72 of the thread gripping device 7, and in this state, the cutter 4 cuts the thread.

Next, when compressed air is blown into the cavity 52 of the guide box 51 from the blower nozzle 56, the air flows through the extraction hole 52 at the rear end of the cavity.
However, the thread is blown into the cavity and pulled up against the force of the thread gripping device 7, as shown in FIG. By the time the free end of the thread cut by the cutter reaches near the thread gripping device 7, the thread blown into the cavity has also reached the vicinity of the removal hole, so no force to pull the thread further acts on the thread. It disappears. Therefore, the thread stops in this state. Therefore, the force of blowing out compressed air from the blower nozzle 56 is reduced.

Next, when the cylinder 68 of the thread pulling mechanism 6 advances the thread pulling block to the left in FIG.
The dropper d is positioned at the open end of the nozzle hole 64 and approaches the holding device e of the dropper d, as shown in FIG. 3, so that the nozzle hole 64 and the hole f of the holding device are aligned. In this process, the blowing force of the compressed air blown out from the blower nozzle 56 is smaller than it was at the beginning (less than the resistance force by the thread gripping device), so as the thread pulling block moves forward, the air blows from inside the cavity 52 of the guide box 51. The yarn is pulled out and drawn out one after another, but since at least compressed air is blown out from the blower nozzle, a force acts to bias the yarn into the guide box. For this reason, it is feared that the thread 1 has enough tension to prevent it from slackening.

After the thread drawing block 62 approaches the holding device e and stops, compressed air is blown from the nozzle hole 63 toward the hole f of the holding device e, and the thread r is aligned with the hole through the hole. Pass the thread through the threading hole h (Fig. 10) of the dropper d. Although this embodiment has described the thread being pulled through the dropper d, it can be carried out in the same manner with either a heald or a lead.

In the above embodiment, the yarn pushing device 8 was composed of a guide roller and a cylinder, but as shown in FIG. Alternatively, you can separate them and push the thread between them.

(g) Effects The present invention can produce the following effects.

■By blowing compressed air into the guide box and pulling the thread together, you can prevent the thread from twisting.

■The speed of the thread can be increased because the speed of the compressed air blows out instantly.

■The structure of the device can be simplified due to the small number of purely mechanical thread transfer parts.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the entire yarn supplying and drawing device according to the present invention;
2 and 3 are views similar to FIG. 1 but showing different operating positions; FIG. 4 is a cross-sectional view of the guide box taken along line IV-IV in FIG. 1; and FIG. is a longitudinal cross-sectional view of the guide box, Fig. 6 is a plan view of the thread-pulling mechanism, Fig. 7 is a side sectional view of the thread-pulling block, Fig. 8 is a front view of the thread-pulling block, and Fig. 9 is a diagram of the thread gripping device. 10 is a plan view of the dropper, FIG. 11 is a diagram showing a modification of the thread pushing device, and FIG. 12 is a diagram showing a modification of the thread pushing device.
The figure shows an example of a conventional yarn supply device. 1: Yarn supply pulling device 2a, 2b: Yarn clamper 4: Cutter 5: Yarn pulling mechanism 51: Guide box 56: Blower nozzle 6: Thread pulling mechanism 62: Thread pulling block 64: Nozzle hole 64: Guide groove 7: Yarn Grasping device 8: Thread pushing device Patent applicant: CKD Co., Ltd. Ai! ? Book 3 figure L1 figure tail 6 figure Gai 71! I J, 5' illustrated book 10
Figure q Figure tail If Figure 1a

Claims (1)

[Claims] A pair of yarn clampers that hold the yarn at two positions at a desired interval, and a cutter that is provided close to one of the yarn clampers to cut the yarn, and the yarn cut by the cutter is In a thread supplying and pulling device that passes the thread through the threading hole of a heddle, dropper, reed, etc., a blower nozzle that blows air pressure onto the thread and a portion of the thread that has become slack due to the blowing from the blower nozzle are accommodated near the other thread clamper. A thread guide box is provided with the thread sandwiched therebetween, and a nozzle hole for blowing compressed air toward the thread passing hole is provided at a position closer to the one thread clamper than the thread guide box, and an opening of the nozzle hole is provided. A thread pulling block in which a thread guide groove for guiding the thread is formed is provided so as to be movable in a direction substantially perpendicular to the stretching direction of the thread, and the thread is placed at a position closer to the one thread clamper than the thread drawing block. A yarn supply and drawer characterized in that a yarn gripping device that grips the yarn with a force smaller than the force used to pull the yarn by a blower nozzle, and a yarn pushing device for causing the yarn gripping device to grip the yarn are provided with the yarn sandwiched between them. Device.