JPH02216243A - Weft storing device in loom - Google Patents

Abstract

PURPOSE:To smoothly wind and store special yarn such as glass yarn with controlling bending of the yarn minimum by using a device comprising fixed outer cylinder, intermediate cylinder and inner cylinder and winding the yarn on storing drum through yarn guide rotating with contouring circular orbit by rotary driving of the intermediate cylinder. CONSTITUTION:Yarn Y released from yarn feeder is inserted into a yarn guide 21 in an intermediate cylinder 20 and excitation coil 11 is connected to alternative electric source to generate rotary magnetic field interlinking with the intermediate cylinder 20 and make the intermediate cylinder relatively rotate to the fixed outer cylinder 10 and simultaneously restrict relative rotation of the inner cylinder 30 to the fixed outer cylinder 10 through magnetic pieces 12 and 32, thus the yarn Y proceeds to the arrow direction and is wound on outer periphery of storing drum at rest 31 through the yarn guide 21 and stored, and simultaneously kept on the drum 31 by keeping pin 13. Next, the keeping pin 13 is evacuated to releasing position and a weft nozzle is worked, then the yarn Y is released from the storing drum 31 and picked into opening of warp.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a weft storage device for a drum-type loom for storing a predetermined length of weft in a shuttleless loom.

Prior Art There are two types of drum-type weft storage devices used in shuttleless looms: a fixed drum type and a rotating drum type. , the latter winds and stores yarn fed through a fixed yarn guide onto a rotating drum. The yarn wound around the drum is unwound from the drum through a weft insertion means such as a weft insertion nozzle or a rapier at a predetermined mechanical rotation angle of the loom, and is inserted into the warp shedding as a weft.

Fixed drum types allow you to easily control the amount of stored yarn because you only need to rotate the lightweight yarn guide.Furthermore, since the drum is fixed, there is no locking mechanism to control the locking and unwinding of the yarn. Easy to combine with pins and widely used. On the other hand, the rotating drum type has a fixed thread guide, so there is less bending of the thread during winding, and it is preferred for use with special threads such as glass yarn.
The heavy drum rotates, and the locking pin and its driving mechanism must be mounted inside the drum, making the overall structure extremely complex.

Problems to be Solved by the Invention When using the prior art, the fixed drum type and the rotating drum type each have their advantages and disadvantages as described above, so they are used depending on their purpose. is the reality. That is, from the viewpoint of controllability and simple structure, the fixed drum type is advantageous, but this has the problem that it cannot be used for yarns such as glass yarn because the yarn is excessively bent.

In addition, the thread guide in the conventional fixed drum type is
Its base is disposed coaxially with the drum, and its tip extends diagonally from the rear of the drum to the outer peripheral position of the rear end of the drum, and rotates behind the drum while drawing a conical trajectory. Therefore, there was a problem that the length of the entire device in the axial direction became excessive, making it inconvenient to install it on a loom.

SUMMARY OF THE INVENTION In view of the problems of the prior art, an object of the present invention is to provide a fixed outer cylinder, an intermediate cylinder, and an inner cylinder, form the drum on one end surface of the inner cylinder, and form the thread guide on the intermediate cylinder. Although it is a fixed drum type, there is no excessive bending of the yarn, so it can be well applied to special yarns including glass yarn, and the length in the axial direction can be significantly shortened. An object of the present invention is to provide a novel weft storage device for a loom.

Means for Solving the Problems The present invention has a structure in which a fixed outer cylinder, an intermediate cylinder that is relatively rotatably inserted into the fixed outer cylinder and has a thread guide formed in the axial direction, and an intermediate cylinder that an inner cylinder that is relatively rotatably inserted into the cylinder and has a storage drum on one end surface for winding and storing the yarn from the yarn guide; and rotation driving means for the intermediate cylinder;
The gist thereof is to include a magnet piece that restrains the relative rotation of the inner cylinder with respect to the fixed outer cylinder.

Note that as the rotation driving means, an excitation coil formed on the fixed outer cylinder and generating a rotating magnetic field that interlinks with the intermediate cylinder, or a rotation transmission mechanism that transmits rotational torque to the intermediate cylinder can be used.

Further, the thread guide may be curved in the rotational direction of the intermediate tube, and furthermore, the intermediate tube may include two or more yarn guides that differ in at least one of the curving direction and the radius of curvature.

With this configuration, when the intermediate cylinder is rotationally driven by the rotation transmission mechanism, the yarn supplied via the yarn guide formed in the intermediate cylinder is not wound onto the storage drum formed in the inner cylinder. Can be stored. At this time, the thread guide is
The yarn guide is formed in the axial direction of the intermediate tube and is long in the front-rear direction of the intermediate tube (and the entrance end of the yarn guide, into which the yarn from the yarn supplying body is introduced, draws a circular locus approximately equal to the diameter of the intermediate tube). , the outlet end of which can be opened at a position immediately adjacent to the outer periphery of the rear part of the storage drum, so that bending of the yarn can be minimized. Since the magnet pieces provided between the fixed outer cylinder and the fixed outer cylinder can be opposed to each other with a small gap sufficient for the thread to pass through, a necessary and sufficient restraining force can be easily obtained.

If an excitation coil that generates a rotating magnetic field is used as a rotation drive means, the principle of an induction motor will cause the intermediate cylinder to
Rotational torque can be applied electrically, and if a rotation transmission mechanism is used, rotational torque can be mechanically transmitted to the intermediate cylinder from the outside. As the rotation transmission mechanism at this time, any mechanism such as a belt, chain, or gear mechanism can be used.

By curving the thread guide in the direction of rotation of the intermediate cylinder, the direction of the entrance/exit end of the thread guide can be aligned with the traveling direction of the thread, so that bending of the thread at the entrance/exit end of the thread guide can be further reduced.

By forming two or more yarn guides with different curved directions and curvature radii on the intermediate cylinder, the rotational direction of the intermediate cylinder, that is, the winding of the yarn around the storage drum can be adjusted depending on the direction and the rotational speed of the intermediate cylinder. The most suitable thread guide can be selected and used as appropriate.

Example Examples will be described below with reference to the drawings.

The weft storage device (hereinafter simply referred to as the storage device) of a loom consists of a fixed outer cylinder 10, an intermediate cylinder 20, and an inner cylinder 30 arranged coaxially (Fig. 1). A storage drum 31 is provided in a protruding manner.

The fixed outer cylinder 10 is a cylindrical body that is fixedly installed at a predetermined position on the loom frame via a mounting base (not shown),
An excitation coil 11 is embedded in the inner surface thereof. It is assumed that the excitation coil 11 generates a rotating magnetic field interlinking with the intermediate cylinder 2o when excited from an AC power source (not shown). A ring-shaped magnet boulder 12a is attached to the rear end surface of the fixed outer cylinder 7, O, and a magnet piece]2 is attached to the inner surface of the ring-shaped magnet boulder 12a.
．． 12... are buried. However, magnet piece 12.1
2... indicates that a plurality of magnets are arranged in the circumferential direction of the magnet holder 12a.

A locking pin holder 13a is provided protruding from the front end surface of the fixed outer cylinder 0, and a locking pin 13 is attached to the tip thereof.

The locking pin 13 is located at a locking position where it protrudes in line with the surface of the storage drum 31 by a driving mechanism (not shown);
It can take an unraveling position where it is retracted from the surface of the storage drum 31.

The intermediate cylinder 20 is connected to the bearing BGI via the BGI.
It is a cylindrical member inserted into the fixed outer cylinder 10 so as to be relatively rotatable. The intermediate cylinder 20 has a thread guide 21 in its axial direction.
A mail 21 is formed at the entrance end of the thread guide 21.
A is provided, and its outer end is slightly curved inward. The intermediate cylinder 20 is entirely made of a conductive member, and can be rotated by receiving rotational torque from the rotating magnetic field from the excitation coil 11. In addition, the intermediate cylinder 20
The thread guide 21 is modeled after the squirrel cage rotor of an induction motor.
By the bars that form this and the bars that do not form this,
The entire structure may be formed into a cage shape.

The inner cylinder 30 is inserted into the intermediate cylinder 20 via bearings BG2 and BG2 so as to be relatively rotatable. Inner cylinder 3
A storage drum 31 is protruded from the front end surface of the yarn Y, and when the inner cylinder 3o and the intermediate cylinder 2o are rotated relative to each other, the yarn Y from the yarn guide 21 is wound and stored on the storage drum 31. It is now possible to do so. However, storage drum 3
1 is a plurality of divided drum pieces 31a arranged in the circumferential direction;
31a... is formed as an aggregate. Each divided drum piece 31a has a sloped outer circumferential side from its base to its tip.
The surface thereof consists of a sloped portion 31b and a parallel portion 31c at the front end. Further, it is assumed that the locking pin 13 moves forward and backward relative to the parallel portion 31c.

A ring-shaped magnet holder 3 is attached to the rear end surface of the inner cylinder 30.
Magnet pieces 32, 32... are arranged via 2a. The magnet pieces 32, 32... are attached to the fixed outer cylinder 1.0 side through a small gap d sufficient for the thread Y to pass through.
... are arranged so as to face each other. Further, it is assumed that the mutually opposing magnet pieces 12 and 32 exert an attractive force on each other and restrain the relative rotation of the inner cylinder 30 with respect to the fixed outer cylinder core o.

Now, when an AC power source is connected to the excitation coil 11,
The excitation coil 11 generates a rotating magnetic field that interlinks with the intermediate cylinder 20, thereby allowing the intermediate cylinder 20 to rotate relative to the fixed outer cylinder 10. On the other hand, the inner cylinder 30 is restrained from rotating relative to the fixed outer cylinder 10 via the magnet pieces 12.12...32.32.

Therefore, if the yarn Y unwound from a yarn feeder (not shown) is inserted through the yarn guide 21 of the intermediate tube 20, the yarn Y will be
The yarn is supplied in the direction indicated by the arrow in the figure, passes through the yarn guide 2, and can be stored on the outer periphery of the stationary storage drum 31. However, the yarn Y is locked by the locking pin 13 and is restrained from unwinding from the storage drum 31.
It is assumed that the tip is restrained by a clamper, weft inserting nozzle, etc. (not shown).

When the predetermined number of turns of yarn Y is wound or stored on the storage drum 31, if the locking pin 13 is retracted to the unwinding position, the yarn Y
Since the yarn Y can be unwound from the storage drum 31, by releasing the clamper and operating the weft insertion nozzle in this state, the yarn Y can be inserted into the warp opening.

However, each weft insertion member including the locking pin 13 and the weft insertion nozzle is controlled to operate at a predetermined machine rotation angle by a weft insertion control device (not shown).

The amount of yarn Y wound on the storage drum 31 is determined by a winding amount sensor (not shown).
By detecting the number of turns and controlling the rotation of the intermediate cylinder 20, it is possible to always maintain an appropriate amount. Volume 1 at this time
To control this, the intermediate cylinder 20 may be operated intermittently and its average rotational speed may be controlled, or the frequency of the AC power source that excites the excitation coil 11 may be controlled. Also,
Without using a winding amount sensor, the intermediate cylinder 20 is adjusted such that the rotation amount of the intermediate cylinder 20 is a predetermined ratio to the rotation amount of the loom.
The rotation of 0 may be controlled synchronously.

Other embodiments Instead of being electrically driven by the excitation coil 11 of the fixed outer cylinder 10, the intermediate cylinder 20 may be mechanically driven from an external drive source via the belt B (second figure)
. The belt B is wound around the outer periphery of the rear part of the intermediate cylinder 20, and is drawn out to the outside through a through hole 10a provided in the fixed outer cylinder]0. Since it can be mechanically connected to the main shaft of the loom, the amount of yarn Y wound around the storage drum 31 can be easily controlled.

The belt B may be wound around the front end of the intermediate cylinder 20 (FIG. 3). The lower front side of the fixed outer cylinder 10 is made thicker (
The notch allows the belt B to be attached to and removed from the intermediate cylinder 20 extremely easily. Note that here, the intermediate cylinder 20 is rotationally driven by the motor M.

Even if the belt B is wrapped around the rear end of the intermediate tube 20, the magnet pieces 12, 12, 32, 32, etc. are fixed on the outer tube 10.
, by disposing it in the middle part of the intermediate cylinder 20, the belt B can be easily hooked and unhooked as in the previous embodiment (FIG. 4). In addition, here, belt B is
It is covered by belt cover BC.

In each of the above embodiments, it is sufficient for the bell l-B to form a rotation transmission mechanism that transmits rotational torque to the intermediate cylinder 20.
Any type of transmission member can be used, such as a chain-gear mechanism.

Moreover, the thread guide 21 formed in the intermediate cylinder 20 is
Instead of forming it in a straight line in the axial direction of the intermediate cylinder 20, it can also be formed in a curved line in the rotational direction of the intermediate cylinder 20 (
Figure 5). The yarn Y that is unwound from the yarn supply body YB, passes through the yarn guide 21, and is wound around the storage drum 31 is passed through the yarn guide 21 at the entrance and exit end of the yarn guide 20 in the rotational direction of the intermediate cylinder 20 (20 Moreover, it curves smoothly inside the thread guide 21 and can change its direction, so that the traveling direction of the thread Y at the entrance/exit end of the thread guide 2] and that of the thread guide 21 can be changed. The direction can be matched, and the risk of damage to the yarn Y, which has poor flexibility, can be minimized.

Note that when the direction of rotation of the intermediate cylinder 20 is reversed, it is preferable to reverse the direction of curvature of the thread guide 21 as well (double-dashed line in the figure).
. Further, the radius of curvature of the thread guide 21 may be optimally changed depending on the rotational speed of the intermediate cylinder 20, and generally, the radius of curvature is preferably made smaller as the intermediate cylinder 20 rotates at a higher speed. Furthermore, one intermediate cylinder 20 has a plurality of thread guides 21 with various curvature radii and directions of curvature including a straight line.
．． 21... can also be formed. The most suitable yarn guide 21 can be selected and used depending on the operating conditions of the loom.

Note that each of the above embodiments has been exemplified as a so-called weft length measuring storage device that is equipped with the locking pin 13 and has a length measurement function of the yarn Y, but this invention does not include the locking pin 13, This can be applied as is to a weft storage device that simply has a storage function.

As described in detail, according to the present invention, a fixed outer cylinder, an intermediate cylinder, and an inner cylinder are provided, and a yarn guide and a storage drum are formed in the intermediate cylinder and the inner cylinder, respectively. When the intermediate cylinder is driven to rotate, the yarn unwound from the yarn feeder is introduced into the inlet end of the yarn guide which rotates in a circular trajectory, and the outlet end opens at a position immediately adjacent to the rear outer periphery of the storage drum. After that, the windings can be stored on the storage drum, so the bending of the yarn can be minimized, and therefore,
Although it is a fixed drum type, it can be well applied to special yarns such as glass yarn, and in addition, a special member such as a conventional rotating hollow yarn guide is attached at the rear of the storage drum. Since this is not necessary, the overall dimension in the axial direction can be significantly reduced, which is an extremely excellent effect.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an entire center cross section showing an embodiment. FIGS. 2 to 4 show a first embodiment showing different embodiments, respectively.
It is a figure equivalent figure. FIG. 5 is a schematic explanatory diagram of an intermediate cylinder showing another embodiment. Y... Thread 10... Fixed outer tube 11... Excitation coil 13... Locking pin 20... Intermediate tube 21... Thread guide 30... Inner tube 31... Storage drum 12 ...Magnet piece 32...Magnet piece

Claims (1)

[Scope of Claims] 1) a fixed outer cylinder; a fixed outer cylinder inserted into the fixed outer cylinder so as to be relatively rotatable;
an intermediate cylinder having a yarn guide formed in the axial direction; an inner cylinder having a storage drum on one end surface that is relatively rotatably inserted into the intermediate cylinder and winds and stores the yarn from the yarn guide; A weft storage device for a loom, comprising a rotational drive means and a magnet piece that restrains the relative rotation of the inner cylinder with respect to the fixed outer cylinder. 2) The weft storage for a loom according to claim 1, wherein the rotation driving means is an excitation coil formed on the fixed outer cylinder and generating a rotating magnetic field interlinked with the intermediate cylinder. Device. 3) The weft storage device for a loom according to claim 1, wherein the rotation drive means is a rotation transmission mechanism that transmits rotation torque to the intermediate cylinder. 4) Claims 1 to 3, wherein the thread guide is curved in the rotational direction of the intermediate cylinder.
A weft storage device for a loom according to any one of paragraphs. 5) The weft of a loom according to any one of claims 1 to 3, wherein the intermediate tube includes two or more of the yarn guides that differ in at least one of a bending direction and a bending radius. Storage device.