JPS636135A - Method for measuring length of weft yarn in shuttleless loom - 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 Object of the Invention (Field of Industrial Application) This invention relates to a weft length measuring method in a shuttleless V& machine.

(Prior Art) Generally, in a chef's room, it is necessary to constantly measure the amount of weft inserted by the jet fluid and maintain it at a constant value. For example, Japanese Patent Laid-Open No. 57
There is one shown in No.-29640. This device locks and unwinds the weft yarn stored on the drum at regular intervals using a solenoid bin installed so that it can approach and separate from the outer peripheral surface of the drum. The sensor detects the passage of the clock and outputs a signal to the control system, which starts the counting operation. When this count reaches a predetermined value set corresponding to the required amount of weft insertion, a solenoid pin locks the weft onto the outer peripheral surface of the drum and stops the weft insertion operation.

In this type of device, even if fluff or the like passes through the detection area of the sensor, the sensor may detect this and output an erroneous signal to the control system, resulting in malfunction of the control system.

The frequency of malfunctions caused by this control system increases in proportion to the number of times the sensor is activated.

Therefore, in the above-mentioned device in which the sensor detects the passing of the weft each time one turn of the weft is unwound, the number of malfunctions caused by the control system increases, and the length of the weft may not be accurately measured.

In addition, in the weft supply device disclosed in Japanese Patent Application Laid-open No. 59-125944, when the weft stored on the drum is pulled out, a detector detects the first unwinding and the next unwinding, and a detection signal is generated. is output to the control system, and the weft insertion end time is calculated based on the time between the first detection signal and the next detection signal. Then, the solenoid pin is brought into contact with the outer peripheral surface of the drum in accordance with the calculated timing,
The unwinding of the weft threads is regulated.

However, even in this device, since the detector operates twice, the detector frequently outputs false signals due to the passing of fluff, etc., and there is still room for improvement in preventing weft length measurement errors caused by malfunctions in the control system. There is.

(Problems to be Solved by the Invention) As described above, this invention attempts to solve the problem that malfunctions of the control system occur during weft insertion, resulting in many errors in weft length measurement. An object of the present invention is to provide a method for measuring weft length in a shuttleless loom, which can perform highly accurate weft length measurement by reducing the number of operations for detecting weft unwinding.

Structure of the Invention (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention provides an operation in which the weft thread locking means is separated from the drum during one weft insertion, and an initial unwinding of the weft threads. The method detects the motion and measures the time between re-movements, calculates the time required for unwinding the weft necessary for weft insertion based on this measured time, and operates the weft thread locking means based on the result of this calculation. A method is adopted in which the weft threads come into contact with the outer peripheral surface of the drum to prevent unraveling of the weft threads.

(Function) By employing the above-described means, the present invention detects only the passage of the weft that is first rewound when inserting the weft.

(Example) Hereinafter, an example embodying the present invention will be described in detail with reference to the drawings.

A motor 2 whose speed is controlled by a motor rotation speed control device 1 such as an inverter is mounted and supported on one side of the loom (not shown), and a drive gear 4 is fixed to the front end of a motor shaft 3 of the motor 2. has been done.

Above the drive gear 4 is a driven gear 5 that meshes with the drive gear 4.
is arranged, and the rotating shaft 6 of the driven gear 5 is provided with a thread guide hole 6a along the axis. The rotating shaft 6 is supported in the front by a support frame 7 so as to be relatively rotatable, and can pass through a first locking gear 8 fixed to the front surface of the support frame 7 and rotate integrally with a hollow rotating bracket 9. installed on. A cylindrical thread winding arm 10 is fixed to the rotating bracket 9 so as to be oblique to the rotating shaft 6, and its front end is opened near the outer circumferential surface, which will be described later.

A second locking gear 12 facing the rotating bracket 9 is supported at the tip of the rotating shaft 6 so as to be relatively rotatable, and a drum 11 is mounted on the front surface of the second locking gear 12.
It is fixed via 3.

Then, the weft yarn Y supplied from the cheese T is passed through the yarn guiding hole 6as.
The thread can be wound on the thread winding surface of the drum 11 via the thread winding arm 10.

A support 14 is fixed to the rotating bracket 9, and a pair of planetary gears 17 and 18 fixed to both sides of the support 14 via a mounting shaft 15 are attached to the first and second locking gears 8. .12 and mesh with each other. And motor 2
When the rotating shaft 6 and rotating bracket 9 rotate with the rotation of Because they revolve while meshing, both locking gears 8 and 12 do not rotate, and as a result, the bracket 13 and the drum 1
1 is held stationary. Note that the drum 11 can also be maintained in a stationary state by known means, such as using a magnet or a weight.

An electromagnetic solenoid S is located near the front outer peripheral surface of the drum 11.
A locking pin 19 is provided as a weft locking means that is projected and retracted at a position, and an electromagnetic solenoid S is electrically connected to a control section C via a solenoid drive section 20. Then, the electromagnetic solenoid S is energized based on a signal output from the control section C, and the locking pin 19 engages with the outer peripheral surface of the drum 11 so as to be able to come into contact with and separate from the drum 11. The drawing-out of the weft yarn Y is regulated.

Same (a first reflective photoelectric sensor 21 having a light emitting part and a light receiving part is arranged near the front outer peripheral surface of the drum 11,
It is detected whether or not more than a predetermined number of weft yarns Y are stored on the outer peripheral surface of the drum 11. This photoelectric sensor 21 is electrically connected to a control section C via a waveform shaping section 22, and controls the operation of the motor 2 via the control section C according to the amount of weft Y stored on the drum 11. be.

Further, a second reflective photoelectric sensor 23 is disposed near the front outer circumferential surface of the drum 11 with a phase difference of 180° from the locking pin 19, and a second reflective photoelectric sensor 23 is disposed with a phase difference of 180° from the locking pin 19. At the time of sowing, the first unwinding of the same weft Y is detected.

The photoelectric sensor 23 is electrically connected to a control section C via a waveform shaping section 24 and a timer 24a.

In addition, the reference numeral 27 in FIG. 1 indicates a main nozzle, into which the weft yarn Y unwound on the outer circumferential surface of the drum 11 is drawn by a fluid jet.

As shown in FIG. 3, the computer 28 of the control section C
(Central processing unit CPU, read-only memory IJROM,
A preset required weft insertion amount n (indicating the number of turns on the drum 11) of the weft Y is input into the memory RAM (comprised of a readable and rewritable memory RAM).

As shown in FIG. 1, the locking pin 19 is in contact with the outer peripheral surface of the drum 11, and the outer peripheral surface of the drum 11 has a weft thread Y.
The required amount is stored by winding. At this time, the motor 2 is stopped and the thread winding arm 10 is also in a stationary state. When the machine base rotates from this state and the machine base rotation angle reaches a predetermined value, the control unit C operates the solenoid drive unit 20 and the timer 2 based on the detection signal from the machine base rotation angle detection device 26.
An operation command is output to 4a.

The solenoid driving section 20 demagnetizes the electromagnetic solenoid S based on an operation command from the control section C, and moves the locking pin 19 away from the outer peripheral surface of the drum 11 as shown in FIG. At the same time, the timer 24a is activated by the control unit C.
The time measurement operation starts based on the operation command from.

When the locking pin 19 separates from the outer peripheral surface of the drum 11, the drum 1
The weft yarn Y wound and stored on the outer peripheral surface of the drum 11
The weft Y is fed into the main nozzle 27 and weft insertion is started.

During the weft insertion described above, as the weft Y is pulled out,
As the weft yarn Y on the drum 11 is unwound, the second reflective photoelectric sensor 23 detects the passage of the weft Y to be rewound first. Then, the photoelectric sensor 23 outputs a weft passage signal to the timer 24a, and stops the time measurement operation of the timer 24a. Therefore, the timer 24a measures the time t from when the locking pin 19 leaves, that is, from the start of weft insertion until the weft Y is unwound by the first half turn, and outputs the measured time to the control section C.

Then, the control unit C determines the time required to unwind the required amount of weft insertion based on this measured time t, that is, the value obtained by multiplying the difference between the required amount of weft insertion n inputted in advance and the initial unwinding amount by t. (n - 1/2) 2 t is calculated, and (n - 3/2) 2 t has elapsed since the first half-winding rewind, and (n
-1/2) 2 t, an operation command is sent to the solenoid drive unit 20, taking into account a slight response delay.

Therefore, the locking pin 19 protrudes during unwinding of the nth winding yarn,
By contacting the outer peripheral surface of the drum 11, the unwinding of the weft Y is restricted to n turns, and weft insertion is completed.

Furthermore, when the amount of the weft yarn Y wound around and stored on the drum 11 gradually decreases while the weft yarn Y is being pulled out and the amount of storage becomes less than a predetermined amount, the first photoelectric sensor 21 detects this and detects the amount of weft yarn storage. A signal is output to control section C. Then, control section C
Based on this stored amount detection signal, sends an operation command to the motor 2 until the amount of weft Y stored on the outer peripheral surface of the drum 11 becomes equal to the required weft stored amount.

As described above, in the present invention, when inserting the weft yarn Y, only the passage of the weft yarn Y to be rewound first is detected by the photoelectric sensor 23.
detects it and outputs a weft passing signal to the control section C, which then measures the time required for one weft insertion based on the start of weft insertion and this passing signal. Therefore, the frequency of detection errors caused by foreign substances such as fluff is reduced, and detection accuracy is extremely high. Therefore, there are fewer malfunctions of the control unit C, and stable measurement operations can be performed.

Effects of the Invention As detailed above, the present invention detects the movement of the weft yarn locking means away from the drum and the first unwinding operation of the weft yarn during one weft insertion, and calculates the time between the re-operations. Based on this measured time, the time required for unwinding the weft yarn required for weft insertion is calculated, and based on the calculation result, the weft yarn locking means is brought into contact with the outer circumferential surface of the drum to prevent weft unwinding. By doing this, the operation to detect weft unwinding is reduced (by
It exhibits the excellent effect of being able to perform highly accurate weft length measurements.

[Brief explanation of drawings]

FIG. 1 is a side view showing an embodiment embodying this invention;
Figure 2 is a partially cutaway side view showing changes from Figure 1;
The figure is a block diagram showing the control section. Drum 11, weft locking pin 19, weft Y.

Claims (1)

[Claims] 1. The rotational drive mechanism winds and stores the weft yarn around the outer circumferential surface of the drum, and the weft locking means that comes into contact with the outer circumferential surface of the drum prevents the unraveling of the weft yarn, and when inserting the weft, the weft yarn locking means is attached to the outer circumferential surface of the drum. This is a weft length measurement method in which the weft threads are pulled out at a distance from each other, and the weft thread locking means detects the movement of the weft threads separating from the drum and the initial unwinding action of the weft threads during one weft insertion. Based on this measured time, the time required for unwinding the weft yarn required for weft insertion is calculated, and based on the calculation result, the weft locking means is brought into contact with the outer peripheral surface of the drum, and the weft yarn is unwound. A weft length measurement method for shuttleless looms that prevents unwinding.