JPH01213438A - Controller for length-measuring reservoir for multicolor use - Google Patents

Abstract

PURPOSE:To provide the subject controller so designed that a changeover switch is actuated according to the change in levels of signals such as weft yarn- selection signal from a weft yarn-selection device, and a feed motor is connected to a low-speed-setting device to effect low-speed rotation. CONSTITUTION:A changeover switch 19 is actuated according to the change, between weft yarn-selecting period and non-selecting period, in levels of signals such as weft yarn-selection signals from a weft yarn-selecting device 17 or output signals from a following control circuit 7, thus making a changeover of the output system. During the non-selection period, low-speed-signals from a low-speed-setting device 2 is inputted into a motor-driving circuit 9 in the form of speed-command signals.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a multicolor length measurement storage device for a loom, and more particularly to an improvement in a rotation control device for a feed motor thereof.

BACKGROUND OF THE INVENTION When weft yarns are alternately selected in a multicolor length measurement storage device, the length measurement storage device temporarily suspends length measurement storage operation during a non-selection period. If there is such a pause period, the feed motor of the length measurement storage device will repeat on and off operations, and the tension of the weft thread will change significantly between the length measurement and rest periods, causing weft thread stiffness. This has a negative effect on normal horizontal movement.

Prior Art Therefore, the invention of JP-A No. 59-53743 and the invention of JP-A No. 6
The invention of No. 1-194255 has already disclosed that during the non-selection period, the rotation of the feed motor is not stopped but is continuously rotated at a low speed. However, both of the above conventional techniques require complicated calculations and cannot be put into practical use unless a complicated control circuit is used. Therefore, a simple and practical device for the above control is desired.

OBJECTS OF THE INVENTION Therefore, it is an object of the invention to realize low-speed rotation during non-selection periods with a simple circuit.

Solution to the Invention In view of the above object, the present invention focuses on changes in the weft thread selection signal from the weft thread selection device or the output signal level of the follow-up control circuit, and switches a changeover switch in accordance with changes in these signal levels. This causes the feed motor to be connected to a lower speed setter during non-selection periods.

Therefore, this feed motor is conventionally driven by a follow-up control circuit during the selection period of the weft thread,
It follows the rotation of the loom, but during non-selection periods, it is continuously driven at a low speed by the low speed setting device.

As a result, according to the present invention, frequent on/off of the feed motor, occurrence of vibration, etc. can be avoided, and such necessary control can be realized with a simple circuit configuration.

Structure of the Invention FIG. 1 shows the structure of multicolor, for example, two-color length measurement storage bags W1 and their respective control devices 2.

Each length measuring storage device l is electric type, and a rotary arm 4 is driven by a feed motor 3, and by the rotational movement of this rotary arm 4, the length of the weft yarn 5 is measured by the number of turns necessary for wefting the weft yarn 5 onto the drum 6. I store it while doing so.

Each control device 2 controls the feed motor 3 and includes a follow-up control circuit 7, a low-speed control circuit 8, and a motor drive circuit 9.

The follow-up control circuit 7 is a part that controls the amount of rotation of the feed motor 3 by following the rotation of the loom during the selection period of the weft thread 5, and is assembled by the basic speed setting device lO1 correction counter 11, encoder 12, etc. It is being That is, the basic speed setter 10 is connected to the summing point 14 via the switch 13 in order to provide the basic speed signal (1). Also, the correction counter 11
is connected to the output terminal of the AND gate 15 at the up input terminal, and connected to the encoder 12 connected to the feed motor 3 at the down input terminal, and via the D-A conversion circuit 16 at the output side. It is connected to the summing point 14 to provide a corrected speed signal 2. In addition,
The operating section 13a of the switch 13 and one input end of the AND gate 15 are connected to the weft thread selection device 17, and are operated by the weft thread selection signal C1 as its output. The input end is connected to loom rotation pulse generating means 18. The basic speed signal ■1 and the corrected speed signal ■2 are added together at a summing point 14, and the speed command signal V
3, and finally becomes the speed command signal v5 via the changeover switch 19 in the low speed control circuit 8, and the motor drive circuit 9
becomes the input.

Further, the low speed control circuit 8 controls, during the non-selection period of the weft thread 5,
This is for rotating the feed motor 3 at a low speed, and includes a low speed setting device 20 and an AND gate 23 in addition to the changeover switch 19 described above. This low speed setting device 20 is connected to the contact point of the changeover switch 19 in order to give a low speed signal v4,
Also, the AND gate 23 has a changeover switch 19 on the output side.
It is also connected to the setting switch 21 and the knot circuit 22 on the input side.

The knot circuit 22 is connected to the weft selection device 17 on the input side and is operated by a weft selection signal CI.

Operation of the Invention FIG. 2 shows the operating status of one of the control devices 2. As shown in FIG.

The weft selection device 17 inserts one weft 5 into a lO pick weft during a selection period in one repeat cycle under a preset weft selection pattern, for example (IOXIO), and then inserts the other weft 5 into an IO pink weft. I'm going to put it in. For this reason, the weft selection signal CI changes the signal level every 1O pick, and during the 0 selection period in which the selection period and the non-selection period are regulated, the weft selection signal c1 is
Since the switch 13 is set to the "H" level, the switch 13 is operated by the operation unit 13a and set to the on state, and the AND gate 23 is set to the "L" level from the knot circuit 22.
"Since the level signal is being received, the changeover switch 19
is set to remain at the position of contact a. Therefore, the feed motor 3 is rotated at the basic speed by the speed command signals V3 and v5 corresponding to the basic speed signal Vl.

In this state, while the loom is operating, the loom rotation pulse generating means 18 generates a pulse proportional to the amount of rotation of the loom, so the AND gate 15 outputs the "H" signal of the weft selection signal C1.
The pulse is corrected based on the level of the counter 11.
is fed into the amplifier input terminal. At the same time, the rotation amount of the feed motor 3 is detected by the encoder 12,
A feedback pulse corresponding to the amount of rotation is sent to the down input terminal of the correction counter 11.

Therefore, since the correction counter 11 outputs a signal corresponding to the difference between both pulse signals as a deviation, the D-A converter circuit 16 converts a digital signal corresponding to the deviation into an analog correction speed signal v2. It is sent to addition point 14 as . In this way, the speed command signals v3 and v5 are the sum of the basic speed signal Vl and the positive or negative corrected speed signal v2, and the speed of the feed motor 3 follows the magnitude of the signal. Adjust.

Therefore, the motor speed V rises at a predetermined slope at the beginning of the weft selection period, and settles down to a constant speed while overshooting. In this way, the follow-up control circuit 7 controls the amount of rotation of the feed motor 3 while following the motor of the loom. As a result, the weft thread 5 is
Only the storage IL required for filling is stored on the drum 6.

In this way, when the horizontal insertion of the IO pick is completed for one length measurement storage device 1, the storage operation necessary for the horizontal insertion of the IO pick for the other length measurement storage device 1 is started in the same way.

And, one length measurement storage device l also during the non-selection period,
The operation of the low speed control circuit 8 causes the feed motor 3 to rotate continuously at a low speed. That is, when the weft selection signal C1 falls to the "L" level, the AND gate 2
One input terminal of the gate 3 receives a "H" level signal from the NOT circuit 22, so if the setting switch 21 is set to the on state, the AND gate 23 generates an "H" level operation signal. Then, the drive unit 19a is driven, the changeover switch 19 is changed from contact A to contact O, and the output system is switched. As a result, during the non-selection period, the low speed signal v4 of the low speed setter 20 becomes the speed command signal v5 and is applied to the motor drive circuit 9 as it is.

As a result, the feed motor 3 continues to rotate continuously at a low speed even during the non-selection period. During this time, the rotating arm 4 preliminarily stores the necessary amount of weft yarn 5 on the outer peripheral surface of the drum 6 in preparation for the next weft insertion. Of course, the signal level of this low speed signal (4) is set to a value that sufficiently stores the necessary weft yarn 5 in preparation for the next weft insertion over the non-selection period. In addition,
In the process of switching from the selection period to the non-selection period, the speed of the feed motor 3 rotates due to inertia, and the correction speed signal ■2
changes in the negative direction.

As described above, in this embodiment, the changeover switch 19 is selectively switched depending on the signal level of the weft selection signal C1, so that the output system of the speed command signal v3 for follow-up control during the selection period and the output system of the speed command signal v3 for follow-up control during the selection period and the output system of the speed command signal v3 for the follow-up control during the selection period are Low speed signal ■
4 output systems can be easily switched.

Note that if the setting switch 21 is set to the OFF state, the changeover switch 19 will not be automatically switched, so the low speed control circuit 8 will not function, and therefore the tracking control circuit 7 will not function during the non-selection period. The feed motor 3 is then stopped. Note that the motor drive circuit 9 only allows rotation in one direction (forward rotation), and when the speed command signal V5 is negative, the feed motor 3 stops without rotating in the reverse direction.

By the way, in the weft selection pattern (IOXIO), when the rotation speed of m machine is 600 (rpm) and the feed motor speed at low speed rotation is 180 (rpm), the maximum preliminary winding amount is:
Compared to when such low-speed control is not performed, the number of turns increases by three turns, which is not an inconvenient amount.

Other Embodiments In the above embodiment, the changeover switch 19 is switched in relation to the signal level of the weft selection signal C1. but,
This switching can also be done by other signals.

First, the embodiments shown in FIGS. 3 and 4 are examples in which the changes in the speed command signal v3 during the non-selection period are focused on, and the changeover switch 19 is switched based on the change in the signal level. For this purpose, the low-speed control circuit 8 includes a comparison circuit 24 and a storage circuit 25. The comparison circuit 24 has one input terminal connected to, for example, the contact a side of the changeover switch 19, and the other input terminal connected to the reference setter 26.
It is connected to the set input terminal and reset input terminal of the memory circuit 25 on the output side. This memory circuit 25 is constituted by a timer or the like that generates a "H" level output for a preset time, and is connected in series with the setting switch 21 between the comparator circuit 24 and the drive section 19a of the changeover switch 19. It is connected.

During the selection period, the speed command signal ■3 is set to a high level, so the comparison signal Ql of the comparison circuit 24 is set to ``H''.
The memory circuit 25 falls from the level to "L" level.
is set to reset state. Therefore, if the setting switch 21 is set to the on state, the changeover switch 19 is switched to the contact a side. However, when switching from the selection period to the non-selection period, the speed command signal ■3 changes to a low level, so the comparison circuit 24 corresponds to the level change and changes the comparison signal Q1 from the "L" level to the H level. Therefore, the memory circuit 25 generates a drive signal Q2 of "H level" for a preset time t, and switches the changeover switch 19 from contact a to contact on the condition that the setting switch 21 is in the on state. In this way, during the non-selection period, the low speed signal 4 of the low speed setter 20 is given to the motor drive circuit 9 as the speed command signal V5.

Note that this time t is set in advance to be longer than the non-selection period according to the weft selection pattern.

Next, the embodiment shown in FIG. 5 is an example in which the necessary functions are realized by the digital arithmetic circuit 27 without using analog arithmetic elements. That is, this digital arithmetic circuit 27 is
Part of the functions of the follow-up control circuit 7 and the low-speed control circuit 8 are executed based on the calculation program. The input/output relationship in this case is expressed by the following equation using the symbols in the figure.

Vo = (Vl +Vc) HCI +V4 ・5
-CI Of course, here too, the setting switch 21 is provided to select the low speed control function during the non-selection period.

Effects of the Invention In the present invention, the changeover switch is automatically switched in accordance with changes in the signal level during the weft selection period and non-selection period, and automatically changes from follow-up control during the selection period to low-speed control during the non-selection period. This prevents frequent on/off control of the feed motor and the occurrence of weft thread stretching while the feed motor is stopped.

In particular, the switching control described above can be easily realized using a simple selection switch, a low-speed speed setting device, and a means for switching the selection switch. It can be easily incorporated into the internal multicolor measurement storage device, making it easy to put into practical use.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a control device of the present invention, FIG. 2 is an operation time chart of the above control device, FIG. 3 is a block diagram of a control device according to another embodiment, and FIG. 4 is a block diagram of another embodiment. FIG. 5 is a block diagram of still another embodiment. 1. Length measurement storage device, 2. Control device, 3. Feed motor, 4. Rotating arm, 5. Weft, 6. Drum, 7. Follow-up control circuit, 8. Low speed control circuit. 9...
Motor drive circuit, 10...Basic speed setting device, 11.
- Correction counter, 12... Encoder, 17... Weft selection device, 18... Loom rotation pulse generating means, 19...
Changeover switch, 20...Low speed setting device, 24...
-Comparison circuit, 25...memory circuit, 27...digital arithmetic circuit. Figure 7

Claims (3)

[Claims] (1) The feed motor (3) drives the rotary arm (4), and the movement of the rotary arm (4) causes the drum (6
) In the multi-color length measurement storage device (1) that stores the weft (5) while measuring its length on the weft (5), follow-up control generates a speed command signal by following the rotation of the loom during the selection period of the weft (5). A circuit (7), a low speed setter (20) that sets a low speed signal during a non-selection period, and a switch that switches between the output system of this low speed setter (20) and the output system of the follow-up control circuit (7). During the non-selection period of the switch (19) and the weft thread selection signal, the changeover switch (19) is switched from the output system of the follow-up control circuit (7) to the low speed setting device (2).
0); a motor drive circuit (9) that controls the rotation of the feed motor (3) in accordance with the speed command signal and the low speed signal; A control device (2) for a multicolor length measurement storage device, comprising: (2) The rotary arm (4) is driven by the feed motor (3), and the movement of the rotary arm (4) causes the drum (6
) In the multi-color length measurement storage device (1) that stores the weft (5) while measuring its length on the weft (5), follow-up control generates a speed command signal by following the rotation of the loom during the selection period of the weft (5). A circuit (7), a low speed setter (20) that sets a low speed signal during a non-selection period, and a switch that switches between the output system of this low speed setter (20) and the output system of the follow-up control circuit (7). Switch (19), follow-up control circuit (
A comparison circuit (24) outputs a comparison signal during the non-selection period according to the output level of the control circuit (7). ), a low speed control circuit (8) including a memory circuit (25) and a drive section (19a), and a motor that controls the rotation of the feed motor (3) in accordance with the speed command signal and the low speed signal. A control device (2) for a multicolor length measurement storage device, characterized in that it comprises a drive circuit (9). (3) The control device (2) according to claim 1 or 2, wherein a part of the follow-up control circuit (7) and the low-speed control circuit are constituted by an arithmetic circuit (27).