JPS583060B2 - How to synchronize the main shaft of a warp knitting machine and the pattern control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for synchronizing a pattern control device and a main shaft of a warp knitting machine, particularly a Russell knitting machine.

In conventional warp knitting machines, the stitch pattern is controlled by a pattern device, and as shown in FIGS. 1 and 2, the pattern device connects a guide bar 1 carrying a guide 1a to a push lever 2 and a push rod 3. The shog lever 4 includes a shog lever 4 whose movement is controlled through the shog lever 4, a pattern chain 5 which controls the movement of the shog lever 4, a drive device 6 which drives the pattern chain, and a tension spring device 7 which tensions the push rod.

The chain link of the pattern chain 5 is formed as a cam whose height changes according to the amount of movement of the guide bar 1, and the shog lever 4 moves as a cam follower according to the height change of the chain link, and the movement of the shog lever moves the push rod. The amount of movement of the guide bar is controlled through the guide bar.

Conventional control methods for warp knitting machines require a chain length equivalent to the length of one cycle of the knitting pattern, and in the case of complex patterns, a very long chain is required. , the occupied space becomes larger and the equipment becomes more complicated.

For example, the assembly of chain links as cams becomes complicated.

Moreover, the chain links must be rearranged each time the pattern is changed, and the time and manpower required for this cannot be ignored, and the impact on productivity cannot be ignored.

Further, in the case of lace knitting, etc., the guide bar usually has 10 to 20 axes, and the knitting machine can now use up to about 38 axes.

Moreover, it is necessary to control each guide bar individually.

Conventionally, one pattern chain is provided for each guide bar, so as the number of guide bars increases, not only does it take more time to assemble the chain links, but the pattern device becomes increasingly large-scale.

Moreover, the noise of the chain becomes extremely loud. To solve these drawbacks, an effective means is to store the handle as an electric signal in a storage device, operate the pulse smoke according to the handle signal, and thereby control the guide bar.

However, even when positioning is performed by numerical control using a pulse motor instead of the conventional pattern chain guide positioning, synchronization is achieved between the main shaft of the knitting machine and the guide bar, and the needle The movement of the guide bar must be coordinated with the movement of the guide bar.

That is, the guide bar must swing and the lateral positioning must be performed while the needle is in a depressed state.

If this timing is not correct, the thread may get caught on the needle or the thread may not wrap properly on the needle.

Furthermore, since the maximum follow-up pulse speed of the self-starting frequency of pulse motors is generally determined for each motor, it is necessary to control the moving speed of the guide bar in accordance with its characteristics.

This is because it is undesirable for the guide bar to move suddenly when the rotational speed of the main shaft is low.

In short, synchronizing the movement of the main axis of the knitting machine and the movement of the guide bar, and the rise (slow-up) and fall (slow-down) as the movement of the pulse motor itself.
It is necessary to perform speed control for this purpose and to synchronize the spindle and handle control device.

An object of the present invention is to provide a method for achieving this synchronization in an automatic warp knitting machine in which the guide is controlled by a pulse motor.

As shown in Figure 3, the speed of the pulse motor itself is controlled by the speed of the rise (slow-up) and the fall (slow-up).
One conceivable method for speed control (for slowdown) is to first detect the rotation angle of the spindle and then perform pulse speed control in accordance with the detected signal, but this is currently difficult.

It is also possible to perform pattern control as shown in Fig. 3 using a pulse signal of 1 per cent, regardless of the rotation of the main shaft, but for each guide, for example, one
If 0 sets of patterns are prepared and 30 guides are controlled, a total of 300 sets of patterns must be calculated and controlled.

Based on these considerations, the present invention has been developed to finish generating a scheduled number of pulses within the handle control angle range as handle control time out of the angle corresponding to one course of spindle feed, and to make sure that the pulse interval is within the handle control angle range as handle control time. Prepare an encoder (pulse generator) configured to increase or decrease gradually at the beginning and end of the angle range, and attach it to the main shaft of the knitting machine so that it is in a positional relationship that synchronizes with the movement of the guide bar. The output pulses of the encoder control the pulse smoke and therefore the guide bar.

The present invention will be described below with reference to an embodiment shown in FIG.

10 is a pattern, 11 is a pattern analyzer thereof, and the analyzed pattern 10 is stored in a storage device, for example, a computer 12, as an electric signal S1 or via a perforated tape.

Sometimes, the design 10 is stored in the storage device 12 via a tape 13 created manually.

During operation, first, the control unit 14 is instructed to perform the first call course to the storage device 12.

Next, a drive command is given to the rotational speed control device 18 from the control unit 14 in response to the drive command So from the push button, and the main shaft motor 19 is
to drive.

At the same time, a handle signal call signal S5 is sent from the control unit 14 to the storage device 12, and the handle fingers 4s2 for one course are sent to the storage device 12.
The signal is then sent to the pulse distributor 15 and stored in a temporary storage device in the pulse distributor 15.

Note that one course is the amount of information necessary to simultaneously control all guide bars once, and corresponds to controlling the movement of all guide bars by moving one link of a conventional pattern chain.

When the main shaft is rotated, a rotary encoder 20 connected directly or indirectly to the main shaft is rotated, and according to the present invention, the encoder 20 determines the pattern knitting period by the needles in advance in the angle corresponding to one course of the main shaft. A predetermined number of pulses S3 are generated within a handle control angle range set as the remaining handle control time excluding the handle control angle, for example, 0 to 220° in FIG.

However, the pulse intervals of this pulse train S3 are not uniform, but gradually decrease at the beginning of the handle control angle range and gradually increase at the end.

This is to match the operating characteristics of a pulse motor.

FIG. 5 schematically shows a specific example of an encoder suitable for generating such an irregularly spaced pulse train, in which a rotary light shielding disk 32 is arranged between a light source 30 and a light receiving element 31. The disk has a large number of transparent windows or slits 33 along the periphery of the disk, and the slits 33 create an irregularly spaced pulse train as shown in FIG.

This pulse train Sz is sent to the pulse distributor 15 and the control section 14.

In this case, the first and last pulses of the pulse train S3 applied to the control section 14 control generation and disappearance of the pattern command calling signal S5 and the pattern command sending signal S4 of the control section 14.

A plurality of encoders 20 are provided to cover the maximum movement amount of one course.

For example, if the maximum amount of movement of the guide in one course is 14 pitches, seven encoders are directly connected to the main shaft.

These seven encoders generate seven sets of code signals into a pulse train having a number of pulses corresponding to the code signals,
two sets of pulse trains with a pulse train having a divisor of pulses;
That is, 14 sets of pulse trains are generated in the pulse generator. For example, if 12 pulses are required per pitch movement, 168, 156, 144, 132, 12 pulse trains are generated.
With seven encoders of 0, 108, and 96 pulses, 14 sets of pulse trains up to a minimum of 12 pulses can be obtained as their divisors.

On the other hand, if it is desired to obtain 14 sets of pulse trains, 14 encoders can be provided, but it takes up space and is expensive, so it is more effective to reduce the number of encoders.

Each one of the plurality of pulse trains S3 sent to the pulse distributor 15 is temporarily stored in the pulse distributor 15, and is selected and sent to the drive device 16 according to the handle signal S2 sent out by the signal S5. It will be done.

At that time, each drive device 16a, 16b,...16
A pulse train addressed to one of the plurality of pulse trains S3 is individually selected and sent to n in accordance with the pattern command signal.

This allows individual pulse motors 7a, 17b,...
. . 17n are rotationally controlled, and the guide bars associated with them are moved and positioned under the submerged state of the needle.

The movement of the guide bar is thus controlled.

(2) When the course is completed, the control section 14 sends a pattern command call signal S5 to the storage device 12 in response to the next pulse train S3 from the encoder 20, and the above process is repeated.

Generally, one course of patterns is formed every time the main shaft rotates once.

Normally, pattern knitting is performed using needles during the first 100 or 60 degrees of one rotation of the main shaft and the last 100 or 60 degrees of one rotation, and positioning of the guide is performed within the remaining 7 or 240 degrees.

Therefore, in the pulse train S3 sent to the pulse distributor 15, a predetermined number of pulses are sent to the pulse distributor 15 in a range of 240°, which is the guide positioning section, and the pulse train is distributed by the pulse distributor.

However, since the intervals between the pulses constituting the signal S4 from the control section change according to the pattern shown in FIG. 3, each pulse motor 17a, 17b...
-... 17n rotates slowly just before knitting begins and after knitting is completed during one rotation of the main shaft, in other words, at the start of movement of the guide bar and at the time of positioning, and rotates slowly to completely synchronize with the movement of the needle. Try to synchronize.

FIG. 7 shows the pulse frequency (
PPS), which attempts to complete guide bar feeding within an angular range of 200 degrees in one rotation of the main spindle.

In this pattern, the pulse speed of 300PPS is linearly slowed up to 2500PPS during the rotation angle of the spindle from 0 to 81°, and then the pulse speed is increased to 2500PPS until 119°.
S, the guide bar is fast forwarded, and then the speed is slowed down to 300 PPS while the speed reaches 200°, and the movement of the guide bar is stopped.

If the total number of pulses generated is, for example, 196 pulses, then
71 pulses will be generated between 0 and 81 degrees, 54 pulses between 81 degrees and 119 degrees, and 71 pulses between 119 degrees and 200 degrees.

The inter-pulse angle Pθ at the rising or falling edge of the pattern in FIG. 3 or FIG. 7 can be determined as follows.

If Apps pulses are output while rotating at Rrpm, then Rθ is, and if the pulse interval of A narrows linearly, A becomes A.
It is expressed by the linear equation -a(n-1)+b.

Therefore, It can be found as

For example, in the case of the pattern in Figure 7, when n-1, A=3
00, when n=71, A=2500, so a=220/7, b=300.

That is, if it is rotating at R=300, the required Pθn
It is.

In the case of the pattern shown in FIG. 7, the pulse rate of 300 PPS corresponds to Pθ=6°, and the pulse rate of 2500 PPS corresponds to approximately 45'.

As described above, according to the present invention, the timing of the movement of the guide bar and the movement of the needle can be perfectly matched to the performance of the pulse motor, and can be easily adjusted.

[Brief explanation of the drawing]

Figures 1 and 2 are schematic diagrams of a conventional warp knitting machine, Figure 3 is a pulse speed pattern for pulse motor drive that is to be formed by the method of the present invention, and Figure 4 is a diagram to which the synchronization method of the present invention can be applied. Electrical block diagram for warp knitting machine control, Fig. 3
FIG. 6 is a diagram showing the principle of an encoder that generates a pulse train in the pattern shown in the figure. FIG. 6 is a diagram showing a pulse waveform generated by this encoder, and FIG. 7 is a diagram showing one of its pulse velocity patterns. DESCRIPTION OF SYMBOLS 10... Design, 12... Storage device, 14... Control part, 15... Pulse distributor, 17a, 17b...
・17n...Pulse motor, 20...Rotary encoder.

Claims (1)

[Claims] 1. In a method of synchronizing the main shaft of a warp knitting machine having a pattern control device that controls the movement of the guide bar with balsmoke and the pattern control device, the rotation angle of the main shaft of the warp knitting machine is controlled directly or indirectly. In this case, this encoder detects a preset number of angles corresponding to one course of spindle feed over a pattern control angle range set as pattern control time, excluding the period of pattern knitting by needles. The output pulse of the encoder is configured to generate a pulse and the pulse speed is slowed up at the beginning of the handle control angle range and slowed down at the end, and the output pulse of the encoder is sent to a pulse distributor to A method for synchronizing a main shaft of a warp knitting machine and a pattern control device, characterized in that a distributor selectively distributes output pulses from the encoder according to pattern command pulses and sends them to each of the pulse motors.