JPH0219217B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a weft needle control device in a warp selection device of a jiacard machine that selectively drives each weft needle based on pattern information without using pattern paper, and particularly relates to a weft needle control device in a warp selection device of a jiacard machine. This invention relates to a device that prevents an operating free piston from malfunctioning due to residual magnetism of a solenoid that energizes it.

The selection of warp threads in conventional jia carding machines uses a series of thick papers with weaving information punched in advance according to the weaving pattern, and these papers are connected in an endless band and passed through the cylinder of the loom. Each rotation of the loom, one sheet is fed and pressed against the horizontal needle via a mechanical link mechanism, and the horizontal needle is selectively pressed and moved depending on the presence or absence of punched holes in the pattern paper at that time. The corresponding needle is removed from the knife, and in this way, the warp threads associated with these needles are selected while distinguishing between the needles that will be pulled up when the knife is raised and those that are not, to create the required shed. ing. However, selecting such patterned paper not only requires a great deal of effort and expense to create shibori paper with weaving information, but also requires special techniques, as well as difficulty in attaching and detaching it to the Jiya Guard machine, transporting it, storing it, and managing it. It takes a lot of effort and space,
In addition, the pitch of the punch holes in the patterned paper differs depending on the region of production, or the weaving mechanism may differ depending on the textile industry even in the same production region. There are problems such as the need for

In addition, especially in recent years, jacquard fabrics have become increasingly diverse and sophisticated as lifestyles have improved, and woven patterns have become extremely complex or luxurious, making them highly fashionable and increasing the fashion cycle. It is very difficult to predict in a situation where the process is fast and the duration is short, so it is absolutely necessary to make samples or products by trial weaving in a short period of time.
Due to these changes in the market structure, it is essential to quickly produce a wide variety of small-lot products, and it is also required for Jia card machines to directly select and drive each horizontal needle with an actuator, without using a pattern paper. ing. However, in this case, it is extremely difficult to directly drive the horizontal needles using existing actuators such as solenoids and cylinders due to the shape of the horizontal needle pitch, which is only about 4 to 5 mm, and it is expensive. It has disadvantages such as becoming

On the other hand, in order to be able to arrange the solenoid corresponding to the horizontal needle to obtain sufficient driving force, the horizontal needle and the suction piece of the suction solenoid are connected with a wire, so that the pitch interval of the horizontal needle can be expanded. has been proposed.

However, although this method is more realistic than directly driving the cross needle with a solenoid, etc.
The structure was complicated and large, and not only did it take time to assemble and adjust it to the loom, but it was also not advantageous in terms of cost. Therefore, it has not been possible to fully satisfy the conventional market demands mentioned above.

Furthermore, in response to this problem, the present applicant has provided a weft needle control device for a warp selection device of a jacquard machine as shown below, thereby solving the above-mentioned problems. The conventional example will be explained below with reference to the drawings.

FIG. 1 is a plan view of the entire conventional horizontal needle control mechanism, showing the attachment mechanism to the loom main body. In the figure, reference numeral 1 denotes a solenoid holder which is suspended horizontally on a bracket fixed to a frame or the like on the warp selection device side, and a large number of solenoids 2 are held in this solenoid holder so as to pass through its plate thickness. Each of these solenoids 2
The spacing between them is equal, and the pitch dimension is set to be extremely small. 3 is solenoid holder 1
A post protruding from the back side of the insulating mounting board 4 is fastened and held by screws 5 on this post.
The rear end of each solenoid 2 is supported on this mounting board 4, and the lead terminals of each solenoid 2 are led out.

On the other hand, in front of the solenoid holder 1, a housing 6 is disposed in place of the cylinder of the Jacquard machine and integrated with an interlocking member (not shown) that slides horizontally in response to the swinging motion of the cylinder operating arm. . This housing 6 repeatedly moves forward and backward relative to the horizontal needles with each movement of the loom.

The housing 6 is provided with sliding holes 7 at equal intervals corresponding to the number of horizontal needles through which the horizontal needles can penetrate, and one free piston 8 is installed in each of these sliding holes 7. Built-in so that it can slide freely.
The free piston 8 has the same outer diameter over its entire length, but a ring-shaped locking groove 9, which is wider than at least the wall thickness of a movable stopper to be described later, is provided near the end facing the horizontal needle.

A movable stopper 10 that can slide perpendicularly to the sliding direction of the free piston 8 is provided on the front surface of the housing 6.
Also provided is a locking hole 11 having the same diameter as or slightly larger than the sliding hole 7 of the housing 6.

Reference numeral 12 denotes four guides attached to the housing 6 with screws 13, along which the movable stopper 10 horizontally slides in the left-right direction. 14 is a spring, and one end of this spring 14 is connected to the bracket 10' on the housing 6 side.
The other end is connected to the movable stopper 10, and constantly urges the movable stopper 10 to the right in FIG. A regulating piece for regulating the amount of movement of the movable stopper 10 is provided on the right side of the housing 6.

On the other hand, a pair of guide holes 16 are bored at the left and right ends of the housing 6, into which a guide pin 18 having a conical portion 17 at the tip is slidably inserted. The portion 17 is inserted through a guide hole 19 provided in the movable stopper 10 so as to face the guide hole 16 thereof. These guide holes 16 and 19 have approximately the same size, and a guide hole 19 is formed at the end of the conical portion 17.
Regulating pin 20 to prevent more than the required amount from escaping from the
is inserted.

Note that the guide pin 18 is always urged rearward (toward the solenoid holder 1 side) by a spring 21 that is engaged between the guide pin 18 and the housing 6.

22 corresponds to the number of free pistons 8,
These are horizontal needles located in front of them.

Next, the operation of the horizontal needle control mechanism will be described.

As shown in FIG. 2A, the situation before the loom starts operating is that the housing 6 is moved back the most and the rear end surfaces of all the free pistons 8 are maintained in contact with each solenoid 2.

Now, if the jiacard machine is operated and a current based on the data of the weaving pattern is applied to, for example, the first and third solenoids 2 from the top, the housing 6 will move as shown in FIG. 2b. Move forward in the same direction in sync. At this time, the second free piston 8 receives frictional resistance and the housing 6
On the other hand, the first and third free pistons 8 are attracted to each solenoid 2 by the energization of the solenoids 2 and remain at their original positions.

At this time, the rear end surface of the horizontal needle 22 corresponding to the attracted free piston 8 is located at the locking hole 1 of the movable stopper 10.
1 and enters into the sliding hole 7 of the housing 6.

In this state, the movable stopper 10 receives the elastic force of the spring 14 as the solenoid 2 is stopped from being energized and the guide pin 18 retreats within the guide hole 16 of the housing 6. and slide to the right. That is, the movable stopper 10 acts to reduce the diameter of the sliding hole 7. Thus, the second free piston 8
The locking hole 1 of the movable stopper 10 is inserted into the locking groove 9.
The periphery of the solenoid 1 is locked, and further return to the solenoid 2 side is prevented (FIG. 2c). Note that the energizing and stopping of the solenoid and the movement of the movable stopper 10 do not necessarily need to be activated at the same timing.

Subsequently, the housing 6 moves further forward, but only the free piston 8 that is not attracted by the solenoid 2 is locked around the locking hole 11 in the locking groove 9 and moves forward, and the horizontal needle 22 is moved forward. It comes into contact with the rear end surface and pushes it forward. on the other hand,
The other attracted free piston 8 is the horizontal needle 22
Even if it comes into contact with the horizontal needle 22, it will not be pushed by it and slide to the right inside the sliding hole 7, thereby pushing out the horizontal needle 22.

Next, when the housing 6 completes its forward movement and then starts its backward movement, the free piston 8 remains in the state shown in FIG. After the rear end surface of the free piston 8 that has been attracted to the solenoid 2 comes into contact with the solenoid 2, it is subsequently pushed back into the sliding hole 7. Then, the movable stopper 10 is moved to a position where the free piston 8 is free to move, that is, before the free piston 8 that has been attracted earlier is pushed back and its tip surface collides with the movable stopper 10, that is, in FIG. 2a. returned to the indicated position. Further, when the housing 6 is retracted almost to the rearmost position, the free piston 8 that was not attracted earlier also comes into contact with the solenoid 2. Note that the selective energization of the solenoid 2 is started from this moment until the housing 6 is retracted to the rearmost position.

In this way, the solenoid 2 does not directly move the horizontal needle, but only at the beginning of the operation of the control mechanism, the solenoid 2 is energized. Therefore, according to this conventional example, the biasing force of the solenoid 2 is slightly smaller than the sliding resistance of the free piston 8, that is, the lowest resistance force that can follow the movement of the housing 6 by an appropriate frictional force. As long as it is large, it is sufficient, and as a result, the solenoid for driving the horizontal needles having a pitch interval of 4 to 5 mm can be sufficiently miniaturized. In other words, even a small solenoid can reliably perform the desired horizontal needle pressing operation.

However, in such a conventional cross needle control device, when the housing 6 retreats to the maximum extent after the operations shown in FIGS. If the solenoid 2 that has been activated is not energized in the next cycle, the unenergized solenoid 2
Since the free piston 8 has a residual magnetism due to the energization in the previous cycle, the free piston 8 will continue to be attracted to the solenoid 2, causing a problem in which the free piston 8 will not move to the left following the movement of the housing 6. It was hot.

The present invention improves such conventional problems by, after energizing the selected solenoid 2 in each cycle, continuing to supply the selected solenoid 2 with an alternating current whose amplitude decreases transiently toward zero,
The residual magnetism, that is, the magnetic flux density when the energization of the solenoid 2 is stopped, is maintained at approximately zero to reliably prevent the free piston from malfunctioning.For this purpose, current is selectively supplied to each solenoid 2. After a predetermined period of time after a solenoid selection operating circuit supplies a current for holding a free piston to a selected solenoid, an alternating current signal generating circuit is provided that supplies an alternating current that gradually attenuates toward zero to the selected solenoid. This invention provides a weft needle control device in a warp selection device of a machine.

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 3 shows a control circuit that selects each solenoid 2 and controls the application of pulse current and AC decay current for a predetermined time, and 31 is a solenoid drive for energizing each solenoid 2 for a predetermined time to attract the free piston 8. The circuit is adapted to be supplied with a drive current shown in FIG. 4a for each cycle of horizontal hand drive. A mixing circuit 33 is also connected to this circuit 31 via an amplifier 32, and this is connected to a switch of a switch circuit 35 which is selectively opened and closed at a predetermined timing by a timer 34. Furthermore, the aforementioned solenoid 2 is connected to each of these switches. 36 is a differentiating circuit connected to the amplifier 32, connected to this is an attenuation signal generating circuit 37 which outputs an AC attenuated signal of a predetermined level when the signal of the differentiating circuit 36 falls, and this is also connected to the mixing circuit 33. ing.

Next, the operation of such a control circuit will be explained.

Now, in one warp selection cycle, when the solenoid 2 to be driven is determined, the switch of the switch circuit 35 connected to the corresponding solenoid 2 is closed by the timer 34 for a predetermined period of time. This time is set based on the solenoid drive current input to the circuit 31 (FIG. 4a). This solenoid drive current is input to the mixing circuit 33 via the amplifier 32 and also to the differentiating circuit 36. The differentiating circuit 36 extracts pulses as shown in FIG. 4b from the rise and fall of the solenoid drive current, and using the negative pulses as a reference, the attenuation signal generating circuit 37 extracts the pulses as shown in FIG. 4c. An attenuated signal is generated and inputted to the mixing circuit 33. Thus, in the mixing circuit 33, FIG.
As shown in FIG. 2, a signal consisting of a continuous DC signal and an AC attenuated signal is supplied to the selected solenoid 2 via one of the switches. In this case, although the levels and timings of the AC attenuated signal and the DC signal do not necessarily have to match in consecutive parts, it is desirable that the AC attenuated signal does not fall below the level of the DC signal. Further, it is desirable that the timer 34 is set to a time _T3 or longer, which includes both signal periods _T1 + _T2 . Furthermore, the signal period _T2 does not necessarily need to be set to a length such that the AC attenuation signal becomes zero. That is, even if the AC attenuation signal is cut off on the way to zero, the magnetic flux remaining due to this cutoff need not be so large as to interfere with the operation of the solenoid 2.

In this way, since the AC damping current is input to each solenoid 2 after the predetermined energizing operation, the residual magnetism is immediately removed, and the operation of the free piston 8 in the next cycle can be made smoother. This allows warp thread selection to be carried out without error.

As explained above, according to the present invention, by applying an AC attenuation signal to the solenoid that drives the horizontal needle control free piston after applying a predetermined attraction current, This has the advantage that residual magnetism can be effectively removed, thereby making the free piston movement smoother and more accurate in the next cycle of warp selection.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view showing the entire conventional horizontal needle control device, FIGS. 2 a, b, and c are plan views of the main parts showing the control order of the horizontal needle, and FIG. 3 is a plan view of the main part showing the control sequence of the horizontal needle. Similarly, FIGS. 4a to 4d are signal waveform diagrams of each part of the control circuit. 1...Solenoid holder, 2...Solenoid, 6...
Housing, 8...Free piston, 10...Movable stopper, 22...Horizontal needle, 32...Amplifier, 33...Mixing circuit, 34...Timer, 35...Switch circuit, 36
...Differential circuit, 37...AC attenuation signal generator.

Claims (1)

[Claims] 1. A solenoid disposed in a holder to correspond to the group of horizontal needles of the jiacard machine, a housing disposed in front of this holder so as to move forward and backward with each cycle of the loom, and A free piston is mounted to be slidable in a direction and is provided to face the solenoid, and a free piston that slides in the left and right direction with respect to the housing engages other free pistons other than the free piston that is attracted to the solenoid. A variable stopper is provided, and the free piston to be operated is selected by the initial energization of the solenoid, and the subsequent movement of the housing causes the free piston to push the horizontal needle. In the warp selection device for a jacquard machine, the drive circuit for the free piston is connected to an alternating current attenuation signal generation circuit that continues to supply an alternating current attenuation current after the free piston is actuated. Needle control device.