JP2631229B2 - Weft length storage device for loom - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a weft length measuring and storing device for a rotary drum type loom, and in particular, to a weft of a loom capable of reliably controlling a locking pin on a rotary drum. It relates to a length measuring and storing device.

2. Description of the Related Art A weft measuring and storing device of a drum type loom (hereinafter, simply referred to as a length measuring device) includes a rotating drum type in which a weft is wound on a drum by rotating a drum, and a rotating arm type in relation to a fixed drum. Is roughly divided into a fixed drum type for winding a weft. In the former, when winding the weft, there is little bending in the path of the weft, and therefore, it is not difficult to feed out the weft from the yarn supplying body to the drum. When using a weft yarn that may have a great influence on quality, it can exhibit excellent performance.

In such a rotating drum type length measuring device, the weft wound on the drum is properly locked at a predetermined time during a weaving cycle, and the unwinding of the weft is performed by using a circumferential surface of the drum. It is common to use a locking pin that moves in and out of the device. In order to drive and control the locking pin that rotates with the drum on the rotating drum, a special device is indispensable. That is, a plate cam and a cam follower are housed inside a drum, and a locking pin is driven via these cam mechanisms (for example, Japanese Patent Application Laid-Open No. 56-91042), a brush and a slip ring or a rotary transformer. A device that transmits electric energy from the outside through the device to drive an electromagnetically driven locking pin has been proposed (Japanese Patent Application Laid-Open No. 56-1981).
No. 26038). In particular, the latter one is excellent in responsiveness since the locking pin is of an electromagnetic drive type, and can be well applied to a jet loom that operates at high speed.

Problems to be Solved by the Invention According to such a conventional technique, when a mechanical structure such as a cam mechanism is used, the structure becomes complicated and there is a problem of lack of quick response operation. In the case where electric energy is transmitted by the slip ring, the problem that the overall reliability is insufficient due to the wear of the sliding portion is inevitable.

In the case of transmitting electric energy via a rotary transformer, since the sliding portion is not included, the reliability is not reduced. On the other hand, the fixed coil and the rotary coil forming the rotary transformer face each other. Mechanical dimensions tend to be large because
In particular, when a plurality of rows of locking pins are provided, it is necessary to form a separate rotary transformer for each row, so that it is extremely difficult to form the whole compact. .

SUMMARY OF THE INVENTION In view of the above-mentioned problems in the prior art, an object of the present invention is to directly electromagnetically drive a locking pin on a rotary drum by a fixed coil without using a means for transmitting electric energy such as a brush or a rotary transformer. Accordingly, it is an object of the present invention to provide a weft length measuring and storing device for a loom, which has high reliability, is excellent in responsiveness, and has a very simple and compact overall structure.

Means for Solving the Problems According to a configuration of the present invention for achieving the above object, a fixed coil is provided inside a rotary drum coaxially with the rotary drum, and a plunger portion of a locking pin is provided at an outer peripheral portion of the fixed coil. When the fixed coil is energized, the locking pin is sucked over the entire circumference of the fixed coil so that the locking pin moves in and out toward the inner surface side of the rotating drum, and the peripheral side surface of the rotating drum. The gist of the present invention is to perform the locking operation and the unwinding operation of the weft wound on the woof.

In addition, a plurality of locking pins may be provided in the circumferential direction of the rotating drum, and furthermore, the fixed coil and the locking pin
It may be arranged in multiple rows in the axial direction of the rotating drum.

According to this configuration, the locking pin is disposed on the rotating drum and rotates with the rotating drum, while the fixed coil is disposed coaxially with the rotating drum inside the rotating drum. However, the plunger portion of the locking pin faces the outer peripheral portion of the fixed coil, and when the fixed coil is energized, the locking pin is attracted over the entire circumference of the fixed coil. Therefore, the forward / backward movement of the locking pin on the rotating drum can be controlled depending on whether or not the fixed coil is energized. In addition, at this time, since the lead wire of the fixed coil can be directly drawn out to the outside, no special electric energy transmission is required.

Therefore, if a plurality of locking pins are arranged in the circumferential direction of the rotating drum along the outer peripheral portion of the single fixed coil, these locking pins can be driven and controlled simultaneously.
If the fixed coils and the locking pins are provided in multiple rows in the axial direction of the rotary drum, the upstream locking pin and the downstream locking pin are individually driven and controlled, so that they are wound and stored therebetween. Reliable feeding control of the weft can be executed.

 It works as described above.

Embodiments Hereinafter, embodiments will be described with reference to the drawings.

The length measuring device includes a rotating drum 11, a plurality of locking pins 20, 20...
11 and a fixed coil 12 inside (see FIG. 1, FIG.
Figure).

The rotating drum 11 includes a tapered portion 11a for winding and storing the weft WF, and a bearing 11b. In the bearing 11b, the bearing is rotatably supported on the support member 13 via bearings 11c, 11c. Have been. A drive belt 14 is wound around the bearing 11b between a drive shaft (not shown).

The locking pins 20, 20,... Are arranged on the tapered portion 11a of the rotating drum 11 at equal intervals in the circumferential direction. The locking pin 20 includes a pin body 21 that penetrates from the inner surface side to the outer surface side of the rotating drum 11 through a through hole 11d formed in the tapered portion 11a,
A compression spring 22 that constantly biases the outer surface of the rotary drum 11 with respect to the pin body 21 is provided.
A flange portion 21a for pressing one end of the compression spring 22 is formed, and a mountain-shaped block-shaped plunger portion 21b is provided at a base end portion.
Are formed. Furthermore, on the inner surface of the rotating drum 11,
A spring case 11e for holding the compression spring 22 is formed.

The fixed coil 12 includes a coil main body 12a provided coaxially with the rotary drum 11 at a distal end of a support member 13 projecting into the rotary drum 11, and a yoke 12b for housing the coil main body 12a. That is, the yoke 12b is formed at the tip end of the support member 13 by a magnetic material into a disk shape having a thickness capable of accommodating the coil body 12a, and the circumferential surface thereof has a gap.
12c, and the shape of the circumferential surface is determined by the asymmetrical slopes 12d and 12e.
And it is finished in a shape compatible with this.

The length measuring device having such a configuration is used for measuring and storing one pick of the weft WF by winding the weft WF around the peripheral side surface of the rotary drum 11 (FIG. 2). That is, weft
WF drives the drive belt 14 in the direction of the arrow K in the figure to rotate the rotary drum 11 in the direction of the arrow K1.
The yarn is unwound from the yarn feeder WF1, passed through a fixed yarn guide YG, wound around the peripheral side surface of the rotating drum 11, and stored for length measurement. At this time, when the locking pins 20, 20,... Protrude on the peripheral side surface of the rotary drum 11, the weft WF is
No unwinding from 11. On the other hand, the weft insertion nozzle N
Supply the weft insertion fluid to the
.. Are withdrawn from the peripheral side surface of the rotary drum 11 toward the inner side thereof, the weft WF is unwound from the rotary drum 11 and is caused to fly by a fluid jet from the weft insertion nozzle N, and a warp (not shown) The weft can be inserted into the opening.

In order to release the locking state of the weft WF by locking the weft WF by releasing the locking pins 20, 20,... What is necessary is just to control the energization state of the exciting current to the coil 12. That is, when the exciting current is not supplied to the coil body 12a of the fixed coil 12, no electromagnetic attraction acts on the plunger portion 21b of the locking pin 20, so that the pin body 21 is 11 is pushed outward (FIG. 3 (A)), and therefore, its tip protrudes on the peripheral side surface of the rotating drum 11, and is in a state of neglecting the weft WF.

In this state, when an exciting current is applied to the coil body 12a, the plunger portion 21b is attracted by the magnetic flux φ leaking to the outside of the gap 12c of the yoke 12b.
21 is drawn inside the rotary drum 11 while compressing the compression spring 22 (FIG. 2B). Therefore, at this time, if the movement stroke d2 of the pin body 21 and the protrusion height d1 of the pin body 21 when the fixed coil 12 is not energized are set so that d1 ≦ d2, the locking pin 20 can When the fixed coil 12 is energized, the whole of the fixed coil 12 retreats inward from the peripheral side surface of the rotating drum 11, and the locked state of the weft WF can be released.
In this way, the locking pin 20 that has retreated into the rotating drum 11 can return to the original position by expanding the compression spring 22 by cutting off the power supply to the fixed coil 12.

Here, the entire fixed coil 12 is a support member.
13, the coil body 12a
For example, an electric wire (not shown) for supplying a current to the tubular support member 13 can be drawn out through the inside of the tubular support member 13.

The locking pins 20, 20,... On the rotating drum 11 are all fixed to the fixed coil 12 by the plunger portions 21b, 21b.
Are arranged in the circumferential direction of the rotary drum 11 so as to face the circumferential surface of the rotary drum 11. Therefore, the fixed coil 12 has a magnetic flux φ sufficient to attract the locking pins 20, 20. , It is possible to cause all the locking pins 20, 20,... To retreat into the rotating drum 11 at the same time by energizing the coil body 12a.

It is assumed that one or more arbitrary number of locking pins 20, 20,... Can be provided.

Another Embodiment The locking pins 20, 20,... And the fixed coils 12, 12 can be arranged in multiple rows in the axial direction of the rotary drum 11 (fourth embodiment).
Figure). The fixed coils 12, 12 are excited at different timings or controlled so as not to be excited, so that the upstream locking pins 20, 20,.
20, 20 ... can be individually driven and controlled.
By separating the weft WF wound and stored between the two,
More accurate weft WF feeding control can be realized. In this embodiment, it is preferable that a shielding member made of a non-magnetic material be interposed between the fixed coils 12 and 12 in the intermediate portion of the fixed coils 12 and 12 in order to reduce leakage of magnetic flux between them.

The fixed coil 12 may be formed by a plurality of coil bodies 12a, 12a,... Divided in the circumferential direction of the rotary drum 11, and iron cores 12b, 12.. The coil body at this time
The excitation pins 12a, 12a... Can simultaneously drive all of them or cut off the excitation to control the driving of the locking pins 20 facing the circumference of the fixed coil 12. Since the direction of the magnetic flux generated by each coil body 12a and the driving direction of the locking pin 20 can be matched, a large attractive force can be easily applied to the locking pin 20. Note that also in this embodiment, the locking pin 20 is
Arrange multiple objects in the circumferential direction of 11
Needless to say, it can be arranged in a double row in the axial direction of the rotary drum 11 together with the rotary drum 12.

Effects of the Invention As described above, according to the present invention, the rotating drum, the locking pin in the circumferential direction of the rotating drum, and the fixed coil coaxial with the rotating drum are provided inside the rotating drum,
The locking pin is opposed to the circumferential portion of the fixed coil, and the locking pin is sucked over the entire circumference of the fixed coil. The electromagnetic force can be electromagnetically controlled with respect to the peripheral surface of the rotating drum, and at this time, the exciting current for the fixed coil can be supplied directly from outside without passing through any special electric energy transmitting means. Therefore, there is an excellent effect that the reliability is high, the responsiveness is excellent, and the whole structure can be made extremely simple and compact.

In addition, even when a plurality of locking pins are provided in the circumferential direction of the rotating drum, or when the locking pins are provided in multiple rows in the axial direction of the rotating drum, there is also a practically excellent effect that it is possible to easily cope with the case. .

BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 show an embodiment, FIG. 1 is a longitudinal sectional view of the entire structure, FIG. 2 is a perspective explanatory view of a use state, and FIGS. 3 (A) and 3 (B). FIG. 2 is an enlarged explanatory view of a main part of FIG. 1 for explaining an operation state. FIG. 4 is a diagram corresponding to FIG. 1 showing another embodiment. FIG. 5 is an explanatory cross-sectional view showing another embodiment. WF ... weft 11 ... rotating drum 12 ... fixed coil 20 ... locking pin 21b ... plunger

Claims (3)

(57) [Claims] A rotating drum, and a locking pin that rotates with the rotating drum and that can be inserted into and removed from an inner surface toward an outer surface with respect to a peripheral side surface of the rotating drum; In a weft length measuring and storing device of a loom that performs a locking operation and an unwinding operation of a weft wound around a peripheral side surface of a drum, a fixed coil is disposed inside the rotary drum, coaxially with the rotary drum, The plunger portion of the locking pin faces the outer peripheral portion of the fixed coil, and when energizing the fixed coil, the locking pin is sucked over the entire circumference of the fixed coil. Weaving length measuring and storing device for looms. 2. A weft length measuring and storing device for a loom according to claim 1, wherein a plurality of said locking pins are arranged in a circumferential direction of said rotary drum. 3. A weft measuring device for a weaving machine according to claim 1, wherein said fixed coil is arranged in two rows in the axial direction of said rotary drum. Storage device.