JPH041100B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a knitting machine, and particularly to a knitting machine having a needle selection timing generating means for generating needle selection timing.

[Prior Art] FIG. 7 shows an example of the configuration of a solenoid drive circuit used to drive the knitting needles of a conventional knitting machine.

In this figure, SW1 and SW2 are switches that energize the solenoid SOL, and E1 and SW2 are switches that energize the solenoid SOL.
E2 is the power supply for solenoid operation. By turning on (closed) the switch SW1 or SW2, the direction of the current flowing through the solenoid SOL changes, so that the set and reset strokes of the solenoid SOL can be obtained. This solenoid
SOL generally uses bipolar electromagnets.

The stroke time of solenoid SOL at this time is
Determined by constants specific to the solenoid SOL. That is, the current i flowing through the solenoid SOL is determined by: i=E/R (1-e ^-R/Lt ). Here, R is resistance, E is voltage, L is coil inductance, and t is time.

Therefore, as shown in the characteristic curve A shown in FIG.
Afterwards, a predetermined stroke is obtained. In addition, the current flowing through the solenoid SOL after energization starts rises as shown in the characteristic curve A above, but the solenoid
The stroke of SOL starts after a predetermined time _T1 after the start of energization, as shown by characteristic curve B shown in FIG.
The minimum operating cycle of the solenoid SOL (the cycle at which it can operate at the highest speed) is time Ta.

FIG. 9 shows the operating principle of a solenoid drive device used in a conventional circular knitting machine.

In FIG. 9, a jack 203 is embedded in a rotating cylinder 206.
3 moves up and down along the groove of the cylinder 206. The solenoid 201 is a general polarized solenoid that moves the action plate 202 toward or away from the cylinder 206 along the direction of arrow Q depending on the direction of the current flowing through the coil.

Since the cylinder 206 is rotating in the direction of the arrow P, when the action plate 202 is close to the cylinder 206, it scoops up the pad 204 and rotates in the direction of the arrow R.
Lift the jack 203 through the path. Then, the knitting needles 205 interact with yarn (not shown) to form a stitch. Conversely, the action plate 202 is the cylinder 20
6, the pad 204 is not linked and moves along the path of arrow R', so the jack 203 is not lifted and no stitches are formed.

The sensor disk 207 is provided with teeth corresponding to the positions of the jacks 203, and the sensor 209 detects the position of each jack 203 by detecting the teeth. Further, the sensor disk 208 is provided with one tooth, and the sensor 210 detects this tooth to detect the reference position of the cylinder 206. The timing of energizing the solenoid 201 is determined by detecting the teeth. The knitting machine control device 211 outputs a current to the solenoid 201 to drive the solenoid 201 according to the pattern information stored inside the knitting machine control device 211 in accordance with the position information detected by the sensors 209 and 210.

10 and 11 show examples of operation timing of the solenoid 201.

Note that FIG. 10 shows the operation timing of the solenoid 201 when the cylinder 206 rotates at a low speed, and FIG. 11 shows the operation timing of the solenoid 201 when the cylinder 206 rotates at a high speed.

At time t ₁ , the sensor 209 is connected to the sensor disk 2
When tooth 07 is detected, a set pulse AA-1 is sent to the solenoid 201. After time Ta, the solenoid 201 is in the set state. Then, at timing P after t ₂ hours from time t ₁ , the action plate 202
The pad 204 comes into contact with the pad 204. Then, from time t ₁
After time Tc, a reset pulse AA-2 is sent to the solenoid 201, and the solenoid 201 enters the reset state. It is assumed that the time _tl from time _t1 until the action plate 202 and pad 204 come into contact divides the pulse period Tc into l:m.

However, as shown in FIG.
6 is rotated at high speed, the pulse period Tc' becomes shorter than the pulse period Tc at low speed, and the timing P' at which the pad 204 and the action plate 202 come into contact naturally becomes earlier. However, since the response time Ta for the solenoid 201 to change from the reset state to the set state is fixed, if the cylinder 206 is rotated at high speed, the action plate 202 and the pad 204 will close together before the action plate 202 reaches the complete set state. Conventional knitting machines had the inconvenience of contact.

Therefore, for example, as disclosed in Japanese Patent Application Laid-open No. 121552/1983, the rotational speed of the cylinder 206 is detected, and the solenoid 201 is adjusted in proportion to the detected speed.
A method has been proposed in which the action plate 202 and the pad 204 are brought into proper contact by shifting the pulse timing applied to the pad 204.

[Problems to be Solved by the Invention] However, in an actual knitting machine, a plurality of solenoids 201 are provided and the action plate 202 is multi-staged, so there is a limit to shifting the solenoid energization timing as described above. There was a problem. Next, this point will be explained in detail.

FIG. 12 shows the operation of a knitting machine in which the action plate 202 is multi-staged.

In FIG. 12, four solenoids 201 and four action plates 202 are provided. Furthermore, a sensor disk 207 for detecting the timing of energization of the solenoid 201 includes a jack 20.
Teeth are provided to correspond to position 3.
In this example, the number of solenoids 201 is four, but in a general knitting machine, about 16 to 24 solenoids are provided.

Therefore, since the number of teeth provided on the sensor disc 207 becomes large, the interval between the teeth becomes short, and the time T from when the sensor 209 detects one tooth to when it detects the next tooth also becomes short. . Therefore, the energization shift time of the solenoid 201 is also limited to within the time T, so even if the cylinder 206 is rotated at high speed, the energization shift time of the solenoid 201 cannot be increased.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a knitting machine that can solve these problems and increase the knitting speed of the knitting machine even in a multi-stage knitting machine.

[Means for solving the problems] In order to achieve such an object, the present invention has the following features:
A plurality of knitting needles moving in a certain direction, a first detection means for detecting the moving speed of the knitting needles, a second detecting means for detecting the moving position of the knitting needles, and a plurality of detecting means for detecting the moving speed of the knitting needles and the moving position of the knitting needles. A storage means that stores in advance the knitting needles to form a stitch from among the knitting needles and the drive timing at which the knitting needles should be driven as needle selection information, and the moving speed of the knitting needles detected by the first detection means and the second detection means. The method includes an extracting means for extracting needle selection information from the storage means in accordance with the detected moving position of the knitting needles, and a driving means for driving the knitting needles to form a stitch based on the needle selection information extracted by the extracting means. It is characterized by

[Operation] According to the present invention, the timing of driving a plurality of knitting needles is stored in the storage means in association with the position and rotational speed of the knitting needles. Then, the first detection means detects the rotational speed of the knitting needle, and the second detection means detects the rotational position of the knitting needle, and the extraction means reads needle selection information corresponding to the detected rotational speed and rotational position from the storage means. Next, based on the read needle selection information, the driving means selectively drives the knitting needles so as to form stitches. In this way, since the drive timing of the knitting needles can be stored in advance in the storage means, the drive timing of the knitting needles can be variably set according to the drive characteristics of the drive means and the rotational speed of the knitting needles. The knitting speed can be increased.

[Examples] Examples of the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an example of the configuration of an embodiment of the present invention. In FIG. 1, the same parts as in the conventional example shown in FIG. 12 are given the same reference numerals.

In FIG. 1, 512 is an encoder that detects the rotational position of the cylinder 206, and the encoder 512 generates an A-phase signal, a B-phase signal, and an origin signal indicating a reference position in proportion to the rotational angle. In addition,
The A-phase and B-phase signals are signals for detecting the rotation direction.

FIG. 2 shows an example of pulse timing generated by the encoder 512.

In FIG. 2, each time the cylinder 206 passes the reference position, an encoder 512 generates a pulse as an origin signal. Furthermore, encoder 5
12 is the A phase depending on the rotational position of the cylinder 206;
Generates a B-phase pulse. The phases of A phase and B phase are different, and by detecting this phase shift,
The direction of rotation of cylinder 206 is detected. In this example, the number of jacks 203 is set to 400, and the number of A-phase and B-phase pulses generated by encoder 512 during one rotation of cylinder 206 is set to 2000.

FIG. 3 shows the operation timing generator 51 shown in FIG.
An example of the configuration of No. 3 is shown below.

In FIG. 3, 702 is a forward/reverse determination circuit. The forward/reverse determination circuit 702 inputs the A phase signal, the B phase signal, and the origin signal from the encoder 512.
A pulse signal having the same number of pulses as the phase signal and the B-phase signal and indicating the direction of forward rotation or reverse rotation (hereinafter referred to as a forward rotation pulse signal) is output. Note that since the forward/reverse determination circuit 702 is well known, detailed explanation thereof will be omitted.

A counter 703 counts the pulse train of the normal rotation pulse signal 702, and is reset by the origin pulse 702b. 704 is a read only memory (ROM). The ROM704 contains cylinder 2.
The origin position information of 06 and each position information are stored in advance. In this example, the memory 704 has, for example, an address space of 2 ¹⁸ =262144 addresses, each address has 2 bits of information, and the read output (2 bits of information) of this address is the memory read signal 704a. and is output to the knitting machine control device 211 as 704b.

705 is an addition/subtraction counter, and the addition signal 70
It has two input terminals: 5a and subtraction signal 705b. The addition/subtraction counter 705 adds the input pulse train of the addition signal 705a to the value held by the addition/subtraction counter, and subtracts the pulse train of the subtraction signal 705b. Then, the count value Q ₀ of the addition/subtraction counter 705
~Q ₆ are output to memory 704 and comparator 707, respectively.

Here, from the addition/subtraction counter 705 to the comparator 70
The signal output to 707a will be referred to as an internal speed signal 707a. A signal 707b instructs the drive motor to control the rotational speed of the cylinder 206, and is input from an input switch (not shown) or the like.

Comparator 707 compares the values of external speed command signal 707b and internal speed signal 707a, and transfers the comparison results to addition/subtraction counter 705 via AND circuits 708 and 709 as comparison information 707c and 707d. When the value of the internal speed signal 707a is greater than the value of the external speed command signal 707b, a "true" value is output to the comparison information 707c, and conversely, the value of the internal speed signal 707a is greater than the value of the external speed command signal 707b.
When the value is smaller than the value, a "true" value is output to the comparison information 707d.

Note that when both the internal speed signal 707a and the external speed command signal 707b have the same value, the comparison information 7
The "for" value is output to 07c and 707d.

706 divides the frequency of the above-mentioned normal rotation pulse signal 702a at a predetermined ratio set in advance, and in this example, one frequency divided output signal 706a for five normal rotation pulses is output to the AND circuit 708. ,709
Output to.

FIG. 4 shows an example of the address structure of the memory 704 shown in FIG.

In FIG. 4, the address space of memory 704
The 262144 address is divided into 128 parts of 2048 addresses, and a normal pattern with position information and origin information is written in the area from the first address of each division to the address plus 2000 addresses.

FIG. 5 shows an example of a pulse waveform corresponding to the contents stored in the memory 704 shown in FIG.

In FIG. 5, 801a is the knitting machine control device 21
This is a digital value indicating position information 803 (corresponding to the memory read signal 704a shown in the third diagram) to be sent to the memory read signal 704a shown in FIG. 802 is a digital value indicating origin information 804 (corresponding to the memory read signal 704b shown in the third figure).

In the 128 divided address areas of the memory 704, origin information having different phases and positional information of the cylinder position corresponding to the energization timing to each coil 201, that is, the energization timing, are stored in advance in a pattern. There is. In this example, as described above, the number of pulses generated by the encoder 512 in one cycle is 2000,
Since the number of jacks is set to 400, the memory 704 sequentially generates one piece of position information 803 for every five encoder pulses in order to determine the operation timing of each jack.

Furthermore, if each pattern of position information is set so that the phase is shifted by one pulse, the number of patterns is 128, and one piece of position information is determined for every five encoder pulses, so 128/5 = 25.6 ≒ 25, and it is possible to shift the solenoid drive timing by the amount of time corresponding to the 25 jacks before the current one.

Next, the operation of this embodiment will be explained with reference to FIGS. 3 and 6.

FIG. 6 shows an example of the signal waveform of this embodiment.

In FIG. 6, when A-phase and B-phase encoder pulses are sent from the encoder 512 as the cylinder 206 rotates, the forward/reverse determination circuit 702 generates a forward rotation pulse signal 702a shown in FIG.
Normal rotation pulse signal 7 from the time the origin pulse is generated
When the number of generated pulses (corresponding to the rotational position) of 02a is counted by the counter 703, this counting result is stored in the lower addresses (A0 to A10) of the memory 704.
is output as

The normal rotation pulse signal 702a is frequency-divided by a frequency divider 706, and a frequency-divided output signal 706a is generated. time
At T ₁ , when the rotational speed of the cylinder 206 shifts from low speed (external speed command signal "0") to high speed (external speed command signal "3"), the comparator 707 changes the value of external speed command signal 707b to "3". It is compared with the value "0" of the internal speed signal 707a. At this time,
Since external speed command signal>internal speed signal, comparison information 707d is “true” and comparison information 706c is “false”.
The pulses of the frequency-divided output signal are sequentially added and counted by the addition/subtraction counter 705. Next, when the addition/subtraction counter 705 counts "3", the value of the internal speed signal 707a becomes equal to the value of the external speed command signal 707b, and the comparison information 707c, 707d both become "false", so the count value of the addition/subtraction counter 705 becomes stable at “3”. Since this count value is sent to the upper address (A11 to A17) of the memory 704, the solenoid drive pattern determined by the upper address is determined.

When the external speed command signal 707b is “0”, the value of the addition/subtraction counter 705 is “0”, that is, A11
~A17=0, and the first pattern is selected. (See Figure 4).

Therefore, the address indicated by the counter 703 from among the first patterns in the memory 704, that is, the position information corresponding to the rotational position of the cylinder 206, is sent to the knitting machine control device 211 as a memory read signal 704a. The knitting machine control device sequentially drives each solenoid 201 in synchronization with this memory read signal 704a.

As mentioned above, when the external speed command signal 707b switches from "0" to "3", the addition/subtraction counter 705 changes the number from "0" to "1" to "2" to "3".
Each time the solenoid drive pattern is counted, the solenoid drive pattern is also sequentially selected from "0" to "1" to "2" in synchronization with the frequency-divided output signal 706.
That is, as shown in FIG. 6, position information TG-2 of pattern 1 is sent to the knitting machine control device 21 from time T ₂ , and position information TG- ₃ of pattern 2 is sent to the knitting machine control device 21 from time T 3.
Sent to 1. Therefore, a plurality of solenoids 201
The drive timing of each can be shifted.

For example, in the example shown in FIG. 6, the shift time of the memory read signal 704a is a→
It shows that the length increases sequentially from b to c.

Even when the rotation speed of the cylinder 206 is switched from high speed to low speed, the shift time of the memory read signal 704a is sequentially shortened and sent to the knitting machine control device 211 in the reverse procedure to that described above.

In this way, in this embodiment, the driving timings of all the jacks to be driven are configured as one pattern in correspondence with the position of the cylinder 206, and a plurality of the above patterns are stored in advance according to the rotational speed of the cylinder 206. , the jack drive timing according to the rotational position of the cylinder 206 and the rotational speed of the cylinder 206 detected during operation is instructed based on the stored pattern information. There is no need to shift control the drive timing, and furthermore, it is possible to have a shift time corresponding to a position several jacks ahead of the jack drive position in advance, so the cylinder 206 can be rotated at a higher speed. Therefore, the knitting speed of the knitting machine can be increased.

In this embodiment, one read-only memory is used as the memory 704, but a random access memory whose memory contents can be freely rewritten is used, and needle selection timing information according to the stitch pattern is written in the random access memory. Alternatively, by selectively selecting a memory to be used from among a plurality of read-only memories, it is possible to deal with a plurality of stitch patterns. Furthermore, since the contents of the memory 704 can be rewritten, the response characteristics of the solenoid may vary, or even if the needle selection timing changes due to replacement of the solenoid, the information in the memory 704 can be rewritten in response to the change. You can easily adjust the solenoid mechanism without having to replace the memory.
It is also possible to greatly simplify complicated adjustment work.

Further, in this embodiment, the number of jacks and memory addresses have been explained using specific numbers, but it goes without saying that these numbers and addresses may be set as desired according to the specifications of the knitting machine.

[Effects of the Invention] As explained above, according to the present invention, the jack drive timing is stored in memory in advance in correspondence with the cylinder position and cylinder rotation speed, so that the knitting speed of the knitting machine can be increased. can do. Furthermore, according to the present invention, the output timing of the needle selection position information can be sequentially shifted even when the knitting speed is changed or the solenoid drive timing varies, so even if the knitting speed of the knitting machine is increased. For example, the effect that the pad forming the knitting needle drive mechanism and the action plate are in reliable contact with each other and that damage to related equipment can be prevented can be obtained.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing an example of the configuration of an embodiment of the present invention, FIG. 2 is a timing chart showing an example of the output waveform of the encoder 12 shown in FIG. FIG. 4 is a block diagram showing an example of the configuration of the memory 7 shown in the third diagram.
FIG. 5 is an explanatory diagram showing an example of the address structure of the memory 704 shown in FIG. 3. FIG. 6 is a timing chart showing an example of the operation timing of the embodiment of the present invention. Figure 8 is a circuit diagram showing a configuration example of a conventional solenoid drive circuit, Figure 8 is an explanatory diagram showing the response characteristics of a conventional solenoid, Figure 9 is a schematic diagram showing the operating principle of a conventional knitting machine, 10 and 11 are timing charts showing the operation timing of the solenoid 201 shown in FIG. 9, and FIG. 12 is a schematic diagram showing the configuration of a conventional example. 201... Solenoid, 202... Action plate, 2
04...Putted, 205...Knitting needle, 206...
Cylinder, 211...Knitting machine control device, 512...
Encoder, 513...Operation timing generation section.

Claims (1)

[Claims] 1. A plurality of knitting needles that move in a fixed direction, a first detection means that detects the moving speed of the knitting needles, a second detection means that detects the moving position of the knitting needles, and a moving speed of the knitting needles. a storage means that stores in advance, as needle selection information, a knitting needle to form a stitch from among the plurality of knitting needles and a drive timing to drive the knitting needle in association with the movement position of the knitting needle; and the first detection means. Extracting means for extracting the needle selection information from the storage means according to the detected movement speed of the knitting needle and the movement position of the knitting needle detected by the second detection means; and the needle selection information extracted by the extraction means. A knitting machine characterized by comprising: drive means for driving knitting needles to form the stitches based on the above. 2. In the knitting machine described in claim 1,
A knitting machine characterized in that the plurality of knitting needles move in a circumferential direction. 3. The knitting machine according to claim 1 or 2, wherein the storage means is a memory whose stored contents can be freely rewritten.