JPS5953746A - Weft yarn density variable control apparatus - 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 The present invention relates to a control device for freely changing the weft density of a woven fabric.

The weft yarn is driven into the warp yarn by a reeling motion, and the density of the weft yarn is determined by the winding amount of the winding device.

Conventionally, the weft density has been set by changing the gear ratio of the winding device by changing the gear ratio and changing the winding speed of the woven fabric. According to this conventional means, it is impossible to change gears during operation, so the weft density cannot be changed during operation.

Therefore, an object of the present invention is to freely change the winding speed of the woven fabric during the operation of the loom, especially within one period with a certain number of weft insertions, and to freely change the 14 thread density of the woven fabric. The point is to provide the means to do so.

Based on the above object, the present invention interposes a continuously variable transmission, particularly a differential gear mechanism, in the rotation transmission path between the main motor of the loom and the winding roll of the woven fabric, and between the input and output, The rotation ratio is changed periodically in synchronization with the number of weft insertions.

Hereinafter, the present invention will be specifically explained based on an embodiment shown in the drawings.

First, FIG. 1 shows a variable weft density control device 1t1 of the present invention in relation to a part of a loom. The warp yarns 2 pass from the feed-out beam 4 to the feed-out roll 5, form a path 7 by the vertical movement of the belt 6, and at that position are pressed against the reed 9 while intersecting with the weft yarns 3, thereby forming the woven fabric. 8 and roll 101
Winding roll 11° Roll 12 and then winding beam 13
It is wound up. The beating motion of the reed 9 and the rotational force of the take-up roll 11 are provided by a main motor 14. That is, 140 rotations of the main motor are transmitted to the 5'J lawn mower 4RS, 4.ll716 via the main shaft 15. Here, the reed beating mechanism 16 gives a swinging motion to the reed 9,
The rotation of the main motor 14 for driving the inserted weft yarn 3 into the weft position is applied to the winding roll 11 via transmission shafts 17 and 18. Therefore, the winding roll 11
is the luck of the main motor 14 i.e. R&<3A MI#
In synchronization with this, the woven fabric 8 is wound up for the I1Mth time.

The present invention also provides the main motor 14 and the winding roll 1.
A differential gear mechanism 19 as a continuously variable transmission type is interposed between the rotation transmission path and the rotation transmission shaft 17 and 18, and the gear ratio between the input and output of the differential ITf vehicle mechanism 19 is In addition, an encoder 21 is connected to the main motor 14, and a control device 22 is operated based on this (7) x 7 near-da output to perform this control. The rotation of the pulse motor 20 is controlled by the output of the device n22.

The above-mentioned differential gear mechanism 19 is, for example, composed of a bevel gear train, the input gear 23 of which is fixed to the transmission shaft 17 on the side of the main motor 14, and the output gear 24 is one. ,
An intermediate gear 25 that is fixed to the transmission shaft 18 on the side of the winding roll 11 and also meshes with these input gears 23 and output gears 24 is rotatably attached to the arm 27 of a gear 26 that is rotatable with respect to the transmission shaft 17. The float 26 is supported by
It meshes with an RZ 28 driven by a pulse motor 20.

Furthermore, as shown in FIG. 2, the control device 22 connects a pulse calculation setting circuit 30, an oscillation frequency dividing circuit 31, a selection circuit 32, a driver 33, and a pulse motor 20 to the keyboard 29 in the 1000th order. A counter 34 and a weft insertion number calculator 35 are sequentially connected to the encoder 21, and a selection circuit 32
Further, a forward/reverse switching circuit 36 is connected between the pulse calculation setting circuit 30, the number of weft insertions, the trowel 35, and the driver 33.

Next, the function and series of operations of the variable weft density control bag ff1l will be explained with reference to FIG. 3. The operator operates the keyboard 29 to input the reference density DO, maximum density DI, minimum density D2 . When data such as the repetition period T in relation to the number of weft insertions P is input, these data are sent to the pulse division setting circuit 30. Therefore, the pulse calculation setting circuit 30 determines those densities Do, DI
, the pulse frequency corresponding to D2 is emitted at t13'i"L"
When drive pulses of these pulse frequencies are set in the membrane outer circumferential circuit 31, the number of weft insertions PO corresponding to the repetition period T is calculated, and the value is set in the forward/reverse switching circuit 36.

On the other hand, the rotational force of the main motor 14 is
19, it is transmitted to the take-up 90-rule 11.

Now, if the rotation speed of the input gear 23 is N23 and the rotation speed of the output gear 24 is N24, these are the rotation speed N of the gear 26.
26 is expressed by the following formula.

* ”e N24 = 2 N26 N23 The above formula is based on the number of revolutions N23 tb Weft insertion number PC main motor 14
Even when the number of rotations (number of rotations) is constant, the number of rotations N
26 indicates that it increases or decreases depending on the rotational speed N of the chivalrous smoke 20 and its direction. Therefore, the control device 22 detects the rotation speed of the main motor 140 based on the encoder output from the encoder 21, and periodically changes the rotation speed N of the pulse motor 20 in synchronization with the number of weft insertions P. In other words, the control device L! The counter 34 of t, 22 counts the encoder output from the encoder 21, that is, the number of pulses, and sends it to the weft insertion number calculator 35. , the number of weft insertions P is set to it H, and the result is sent to the selection circuit 32. Therefore, the selection circuit 32 selects the frequency according to the number of weft insertions, so the driver 3
3 gives the pulse motor 20Vca an appropriate rotational speed. Further, every time the heald is inserted corresponding to a half cycle of the period T, the forward/reverse switching circuit 36 reverses the excitation direction by the pulse distributor inside the driver 33, and periodically switches the rotation direction of the pulse motor 20. In this way, pulse motor 2
As shown in FIG. 3, the rotational speed N at 0 changes, for example, in a sine curve shape within the range of the normal rotational speed N1 and the reverse rotational speed N2 with the number of weft insertions P. As a result, Volume 111
The rotational speed of the sirol 11 also changes at the same period. Therefore, the weft density is the standard density 1). , and changes in a similar sine curve shape in the range from the highest density DI to the lowest density D2.

In the above embodiment, the differential gear mechanism 19 is used as the continuously variable transmission, but this continuously variable transmission may be a normal continuously variable transmission such as a PIV continuously variable transmission or a cone type continuously variable transmission. ri'
may be accomplished. Further, the operating device is not limited to a pulse motor, but may also be formed of another type, for example, a DC type variable speed motor.

Furthermore, in the above embodiment, the pulse motor 20 repeats normal rotation and idle rotation with zero rotation as a reference, but the rotation speed of the pulse motor 20 is centered around a certain reference rotation speed other than zero rotation. The speed increase and deceleration in the same rotational direction may be set to be repeated at a cycle T.

In the present invention, the gear ratio of the continuously variable transmission between the main motor and the take-up roll can be freely changed while the loom is running, so the weft density of the woven fabric can be set to a desired value. The settings can be adjusted quickly, and the control device still allows for periodic changes in weft yarn density, resulting in a woven fabric with a unique texture that combines coarse and fine texture.

[Brief explanation of drawings]

Fig. 1 is a skeleton diagram of the variable weft density control device of the present invention, Fig. 2 is a block diagram of the control device, and Fig. 3 is a graph showing the relationship between the number of weft insertions, the rotation speed of the pulse motor, and the weft density. . 1... Weft density variable control device, 2... Warp,
3... Cotton thread, 8... Woven fabric, 11... Winding υ roll, 14... Main motor, 17.18
...Transmission shaft, 19...Differential vehicle support as a continuously variable transmission, 20...Manufacturer (!: l, pulse motor, 21...encoder, 22... Control device. 23

Claims (2)

[Claims] (1) A continuously variable transmission is interposed in the rotation transmission path between the main motor, which is the motive force for the beating motion, and the winding roll of the woven fabric, and an operating device for changing the rotation ratio is provided in the continuously variable transmission. and also install the encoder to the main motor,
A weft density variable control device characterized in that a control device is provided between the encoder and the operating device to control the operating device according to the encoder output. (2) A patent claim characterized in that the continuously variable transmission is constituted by a differential gear mechanism, and the operating device is constituted by a variable speed motor that rotates an intermediate gear of the differential gear mechanism. Lead (? Thread density variable control device) as described in Range 1.