JPH0322280Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a spinning machine for spinning, especially a drawing machine, and is used to process fibers such as wool raw material made into one or more slivers, such as carding. It is used as a device to draft this sliver and create a new sliver.

[Prior Art] Conventionally, when making yarn from raw materials for silk spinning, such as wool, after washing and drying the tangled raw materials,
They are unraveled using a device called a card to form a fiber bundle called a single sliver, and the single or multiple slivers are combined and drafted while being combed using a drawing machine equipped with a combing device called a gill. A single thread of sliver is created, and then this sliver is repeatedly combed and drawn using a drawing machine, and the sliver is kneaded as necessary to produce a single thread.

The structure of the drawing machine that performs the above-mentioned combing and drafting is as shown in FIG. 1. That is, as shown in FIG. 2, a rotary comb 3a is provided between the feed roller pair 1 and the front roller pair 2.
Alternatively, a combing gill 3 having a parallel-moving comb 3b as shown in FIG. The conveying speed of the front roller pair 2, which conveys the sliver 4 while drawing it out from the gill 3, is set at a preset drafting rate (draft rate).
Based on this, for example, if the draft rate is 5, the ratio of the combing speed of the front roller pair 2 and the combing speed of the gill 3 (same as the conveying speed of the feed roller pair 1) is 5:1. Therefore, if the sliver 4 with a weight of 50 g per 1 m passes through the drawing machine 10, the weight of the sliver 4 is 10 g per 1 m.
is drawn into a sliver 4 with a weight of .

Furthermore, an unevenness detector 5 for detecting thickness unevenness of the sliver 4 is provided close to and upstream of the feed roller pair 1, and the thickness unevenness detected by the unevenness detector 5 is stored in a mechanical storage device 6. .

Further, the feed roller pair 1, the front roller pair 2, and the gill 3 are driven by one drive motor M via a plurality of gears 7 and pulleys 8. That is, to prevent the sliver 4 from being cut or jammed in the gill 3, when the drawing machine is operated, the feed roller pair 1, the front roller pair 2, and the gill 3 start rotating at the same time to maintain a constant draft rate. While maintaining the specified speed,
Conversely, when stopping the operation, the speed is lowered while maintaining a constant draft rate, and the machine is stopped at the same time.

However, when starting and stopping, a considerable load is applied to the front roller to stretch the sliver, which causes disturbances in the motor's rotational speed ratio. Situations that lead to entanglement occur. In other words, even if both motors try to start and stop at the same time, the front roller has to pull the sliver at 2 to 12 times the speed of the feed roller, so a pressure (load) of several hundred kg is required on the front roller.
The motor requires large torque. This torque overcomes the load and requires a large torque from the motor connected to the front roller. However, when starting and stopping, the motor has to rotate at low torque, so the front roller motor does not generate enough output torque, and the front roller motor is delayed in operation, so both motors do not operate at the same time. Alternatively, even if both motors operate at the same time, the front roller cannot achieve a predetermined rotation and the conveying speed ratio of both rollers is not constant, making it impossible to obtain a uniform sliver.

For example, as shown in Figure 19A, there is no problem when the sliver is flowing continuously, but when the sliver starts or stops, the two motors do not operate at the same time mainly due to the reasons mentioned above, so As shown in B to E, non-uniformity occurs in the sliver. In Figure B, the feed roller starts rotating a little slower than the front roller at startup, or stops earlier at stop. Figure C shows when the phenomenon of figure B has become significant, and if the phenomenon progresses further, the sliver will break. Contrary to B in the same figure, D in the same figure shows a case where the front roller starts a little later than the feed roller at the time of starting, or stops a little earlier at the time of stopping. When this phenomenon becomes noticeable, the thickened sliver becomes disordered and winds up. In E of the same figure, B, C, and D of the same figure occur simultaneously.

The draft rate of the drawing machine 9 needs to be changed sequentially according to the raw materials, products, processes, etc. Therefore, the draft rate of the drawing machine 9 is usually set in the range of 1 to 10. In this case, it is possible to set gears at intervals of 0.15, and in that case, it is necessary to prepare about 20 gears, and the task of replacing the gears is time-consuming as many gears have to be replaced, and the workability is by no means good. I couldn't say that. Furthermore, it is practically difficult to set the draft rate to a value within 0.15 intervals of the draft rate using only the gear 7 and the pulley 8. Furthermore, in order to adjust the thickness unevenness of the sliver 4, the drive motor M and an expensive continuously variable transmission 1 between the front roller pair 2
When the uneven thickness of the sliver 4 stored in the storage device 6 comes just before the front roller pair 2, the uneven thickness of the sliver 4 is taken out as a signal and sent to the pressure oil via the control valve 11. A drawing machine 9 is provided, which sends the amount of water to a hydraulic actuator 12 and controls the gear ratio of the continuously variable transmission 10 by operating the hydraulic actuator 12.

However, in the case of such a drawing machine 9,
Since a device as shown in the schematic diagram of FIG. 4, a continuously variable transmission 10, etc. are used as the storage device 6,
The range of unevenness adjustment is limited to ±25%, and with recent drawing machines that perform carding at high speed and low responsiveness, it is difficult to adjust the thickness unevenness of sliver 4 of 1 m or less, for example, due to the delay in control. Return Sliver 4
There were problems such as creating unevenness in the normal thickness area behind the uneven thickness area. This is storage device 6
However, a large number of pins 6C are provided on a circular guide 6B that rotates together with a rotating shaft 6A that rotates in synchronization with the feed roller pair so as to be slidable in an axial direction parallel to the rotating shaft 6A, and the pins are moved by the operation of the unevenness detector 5. The push lever 6D moves in the left-right direction in FIG. 4, thereby causing the pin 6C to slide and memorize the unevenness of the sliver 4, and the displaced portion is moved to a predetermined position by the rotation of the rotating shaft 6A. When the movement is made, the sliding displacement amount is taken out by the pin follower 6E and the control valve 11 is operated. This problem was caused by the fact that there is an unavoidable considerable delay time in the propagation of the transmitted signal, which acts as a response delay on the high-speed drawing machine 9.

[Purpose of the invention] The purpose of the invention is to eliminate the need to change gears when changing the draft rate, and to align the fibers while adjusting the uneven thickness of the sliver at the desired draft rate. A spinning machine that can even out the uneven thickness and prevent the sliver from wrapping around and cutting.
In particular, we provide drawing machines.

[Structure of the invention] In order to achieve the above object, the structure of the invention includes a pair of feed rollers for conveying the sliver;
a thickness unevenness detection unit that detects thickness unevenness of the sliver; a storage unit that sequentially stores the sliver thickness unevenness signal detected by the thickness unevenness detection unit; and a first rotational drive that drives the feed roller pair. a front roller pair that conveys the sliver while drawing it out from the feed roller pair; a second rotary drive source that drives the front roller pair; and braking the rotation of the first rotary drive source and the second rotary drive source. an electromagnetic brake that controls the rotation of the one rotary drive source,
Synchronize the rotation of the other rotary drive source with a predetermined rotational speed ratio, and according to the uneven thickness of the sliver stored in the storage unit so that the thickness of the sliver output from the front roller pair is constant. a rotation control circuit that controls the rotation of the two rotational drive sources, and a control signal output to the first rotational drive source and the second rotational drive source at a predetermined brake release level when the spinning machine is started; , when the electromagnetic brakes for both drive sources are simultaneously released and the control signals output to the first rotational drive source and the second rotational drive source reach a predetermined brake activation level when the spinning machine is stopped, The spinning machine is characterized in that it includes an electromagnetic brake control circuit that simultaneously starts operating electromagnetic brakes for both of the drive sources.

[Examples] The present invention will be described below by giving examples and referring to the drawings.

FIG. 5 is a schematic diagram showing the drawing machine 19 according to the first embodiment of the present invention, in which 20 is a pair of feed rollers 22 for conveying the sliver 4 to a gill 21 for carding;
is a first motor and corresponds to a first rotational drive source that drives the gill 21 and the feed roller pair 20,
23 is a pair of front rollers that pulls out the combed sliver 4 sent out from the gill 21 and conveys it while drafting it; 24 is a second motor; 2 is an AC variable speed motor that changes its rotational speed according to the power frequency like the first motor 22, and 25 is a measuring roller pair whose lower roller is displaced according to the thickness unevenness of the sliver 4. ,2
6 is a position sensor that converts the displacement of the measuring roller pair 25 into an electric signal, and the measuring roller pair 25 and the position sensor 26 correspond to an unevenness detecting section. 27, 28
represent first and second pulse generators that detect the rotational speeds of the first motor 22 and the second motor 24, respectively. Reference numeral 29 represents a rotation and electromagnetic brake control circuit that controls the first motor 22 and the second motor 24 and the electromagnetic brakes 43 and 44 that brake these motors.

As shown in the block diagram of FIG. 6, the rotation and electromagnetic brake control circuit 29 includes a central control section 30, which includes a push button switch PB0 for inching and a push button switch PB1 for starting. and a power switch 31 consisting of a push button switch PB2 for stopping;
When soft-starting and soft-stopping the first and second motors 22 and 24, the volume VR1 and VR2, which set the timing for activating and releasing the electromagnetic brakes 43 and 44 described later, and the carding speed of the gill 21 (conveyance of the feed roller pair 20) A volume VR4 is provided to adjust the transport speed of the front roller pair 23. Then, from the central control unit 30, the first motor 2
2. Control signals a and b for the second motor 24 are
Volumes VR3, VR4 and 1st, respectively, mentioned above.
Control signals a′,
b' is output to the first and second inverters 34 and 35, and each inverter 34 and 35 supplies AC power with a frequency corresponding to the voltage value of the control signals a' and b' to the first motor 22 and the second motor 24, respectively. supply to. still,
While the control signal b is sent from the volume VR4 to the second addition circuit 33, it is added or subtracted by the unevenness adjustment addition circuit 36.

In addition, each motor 22, 2 rotates according to the AC frequency output from each inverter 34, 35.
The rotation of No. 4 is caused by the pulse signals e and f having frequencies synchronized with the rotation output from the first and second pulse generators 27 and 28 provided for the rotation shafts of the respective motors. frequency/voltage converter 37,
38 into analog voltage signals g and h, respectively, and the first and second tachometers 39 and 40
The rotational speed of each motor 22, 24 is displayed.

Further, in order to feed back the rotational speed detected from the first motor 22, the analog voltage signal g output from the first frequency/voltage converter 37 is sent to the central control unit 30 and the first comparison circuit 41, At 41, the central control unit 30 controls the volume.
It is compared with the control signal a output via VR3. The comparison results are the normally open contact R11 of the first relay RY1 and the semi-fixed fine adjustment volume VR.
5 to the first adder circuit 32,
The first inverter 3 adjusts the voltage value of the control signal a.
The rotational speed of the first motor 22 is controlled to reach the target rotational speed by increasing or decreasing the output frequency of 4. On the other hand, in order to feed back the rotational speed detected from the second motor 24, a second comparator circuit 42 receives the analog voltage signal h and the volume from the central control unit 30.
VR4 is compared with the control signal b output via the unevenness adjustment adding circuit 36, and the comparison result of the comparison circuit 42 is sent to the second relay via the normally open contact R12 of the first relay RY1 and the semi-fixed fine adjustment volume VR6. The voltage value of the control signal b is outputted to the adding circuit 33, and the output frequency of the second inverter 35 is increased or decreased, thereby controlling the rotational speed of the second motor 24 to reach the target rotational speed.

Furthermore, as shown in FIG. 7, when the control signals for the first motor 22 and the second motor 24 reach a predetermined voltage level at the time of starting and stopping the motors, the central control unit 30 simultaneously starts the motors using the electromagnetic brakes 43 and 44. and stop. Specifically, when starting, the electromagnetic brakes 43 and 44 are released at the voltage level set by volume VR1 (predetermined brake release level), and when stopping, the electromagnetic brakes 43 and 44 are released at the voltage level set by volume VR2 (predetermined brake activation level). A brake signal i commanding operation is issued. Note that although the predetermined brake release level is different from the predetermined brake operation level, these two levels may be the same value and can be set as appropriate within a range that does not impair the electromagnetic brake effect. That is, the first motor 2
2. The second motor 24 has different loads applied to each motor, so it is difficult to completely control the rotational speed immediately after the motor starts or immediately before it stops.
In the frequency range of ~ several Hz, the output frequency of each inverter 43, 44 is controlled, but during that time, the first and second electromagnetic brakes 43, 44
The feed roller pair 20, the gill 21, and the front roller pair 23 are held in a stopped state by simultaneously acting to prevent the sliver 4 from being cut or caught in the gill 21.

The first and second inverters 34 and 35 are set by turning on the start push button PB1 and turning on the stop push button PB2.
The normally open contacts R21 and R22 of the second relay RY2, which are reset when the control signal a or b reaches a predetermined level by ON, respectively, output the output.
ON-OFF control is performed.

Furthermore, a feedforward control signal j for unevenness adjustment is sent to the unevenness adjustment addition circuit 36 via a normally open contact R13 of the first brake relay RY1. This feedforward control signal j is determined by the displacement of the measuring roller pair 25, which is converted into an electrical signal K by the position sensor 26.
The thickness of the sliver 4 is detected, and the electrical signal K is
The reference voltage is adjusted by the adjustment resistor VR7 and compared in the comparator circuit 50, and voltages exceeding or insufficient with respect to the reference voltage are sent to the comparator circuit 50 as an unevenness detection signal l.
The unevenness detection signal 1 is outputted from the device and displayed as thickness unevenness on an unevenness display meter 51 indicating excess/deficiency, and is stored in a semiconductor analog memory 52 as a storage device. This analog memory 52
has a maximum of 2500 addresses in this embodiment, and the pulse signal m output from the first pulse generator 27
The voltage value of the unevenness detection signal l is sequentially stored in each address. The unevenness detection signal l once stored in the analog memory 52 has the number of addresses set by the digital set switch 53,
That is, the address is retrieved again from the address stored by the previous pulse by the number Q of pulses of the pulse signal m,
An amplifier 54 which takes the uneven reproduction signal l' and changes the amplification factor in accordance with the draft rate with VR8, and a two-input offset voltage adder circuit 5 via a manual switch S1.
Sent to 5. In addition, the offset voltage adding circuit 55
Other inputs include the aforementioned VR, depending on the draft rate.
An offset voltage Vos set by a volume VR9 in conjunction with a volume VR9 is applied via a manual switch S2 and sent to an electronic volume 56. The electronic volume 56 uses a transistor or the like to attenuate the input signal based on the control signal and outputs it.The electronic volume 56 is outputted from the analog memory 52, and the voltage is adjusted by the amplifier 54 and the offset voltage adding circuit 55 according to the draft rate. , the uneven reproduction signal l' is adjusted by this electronic volume 56 according to the current analog voltage signal g of the first frequency/voltage conversion circuit 37,
It is assumed to be a feedforward control signal j. That is,
The thickness unevenness of the sliver 4 detected by the position sensor 26 is detected as a voltage signal of the same magnitude whether during soft start control or soft stop control as shown in FIG. 7, or during steady high speed operation control. be done. Therefore, if control is performed directly based on the uneven reproduction signal l' during soft start control or soft stop control, it will result in overcontrol.
When the analog voltage signal g is at the highest voltage at the volume VR10 of 7, the offset voltage addition circuit 55
100% of the signal output from electronic volume 5
6, and is appropriately attenuated according to the value of the analog voltage signal g to become the feedforward control signal j. Furthermore, the position sensor 26 detects irregularities in the feedforward control signal j, and
The uneven portion controls the rotational speed of the front roller pair 23 so that the unevenness is eliminated when the card is discharged from the tip of the gill 21, but the control system of the drawing machine has a control system that is not affected by the carding speed. Since there is a unique response sending time, the number of pulses Q of the pulse signal m of the first motor 22 is set by the digital set switch 53 only in response to the distance from the measuring roller pair 25 to the front roller pair 23. In the method of reproducing the unevenness detection signal l once stored at the previous address, the control will be delayed as the rotational speed of the first motor 22 increases. Therefore, it is necessary to reduce the number of pulses Q according to the value of the analog voltage signal g. The electronic volume 5 described above is responsible for reducing this pulse number Q.
This is a delay adjustment electronic volume 58 similar to 6, and reduces the number of pulses Q set in the digital set switch 53 by a predetermined amount in accordance with the analog voltage signal g. Note that the volume VR11 represents a volume for fine adjustment.

Next, the operation of this embodiment configured as above will be explained.

In this embodiment, the rotation speed ratio between the first motor 22 and the second motor 24 is set to 4, and the first motor 22
The gear ratio for transmitting the rotation of the second motor 24 to the feed roller pair 20 and the gill 21 is the same as the gear ratio for transmitting the rotation of the second motor 24 to the front roller pair 23, and the draft rate is set to "4", that is, the reference feed roller A case will be described in which the front roller pair 23 is rotated at a conveyance speed that is four times the speed of the roller pair 20 and the gill 21.

The control signal a output from the central control unit 30 to the first addition circuit 32 is applied to the contact R11 and the volume VR5 according to the comparison result between the control signal a and the analog voltage signal g similarly output to the first comparison circuit 41. is added to the differential voltage output via the control signal
It is sent to the first inverter 34 as a'. As shown in FIG. 8, the control signal a is controlled in volume so that it is gradually raised to a predetermined level Va (1.5V in this embodiment) over a certain period of time _t1 after the start.
It is output from the central control unit 30 via VR3.
Further, from the central control unit 30, a control signal b is always adjusted to a voltage four times that of the control signal a at a volume VR4 (for example, the voltage _V1 of the control signal a at time α is four times the control signal at time α). The voltage V ₂ of voltage b) is outputted, and is sent to the second addition circuit 33 as well as the control signal a via the unevenness adjustment addition circuit 36.
and is sent to the second comparison circuit 42. Further, when the drawing machine 19 is stopped, the control signals a and b are made to have a voltage of 0 over a certain period of time, contrary to the time when the drawing machine 19 is started.
Then, in the second addition circuit 33, the control signal b is corrected (added) according to the comparison result of the second comparison circuit 42. This correction is performed at the second frequency/
A signal representing the rotational speed of the second motor 24 converted into an analog voltage signal h by the voltage conversion circuit 38, and a control signal b output from the central control unit 30 and voltage-adjusted by VR4 according to the draft rate. are compared in the second comparison circuit 42, and the difference is the contact point R.
12. Second adder circuit 3 via volume VR6
3 and is added to the control signal b, and the control signal
b′ and change the output frequency of the second inverter 35,
The rotational speed of the second motor 24 is changed and controlled so that the value of the analog voltage signal h becomes the same as the voltage value output from the unevenness adjustment adding circuit 36. Therefore, as shown in FIG. 9, the change in the comparison result (output) of the second comparison circuit 42 is fed back to the control signal b in the second addition circuit 33, and the control signal b' is formed and sent to the second inverter 35. The rotational speed of the second motor 24 is controlled to obtain a desired draft rate.

While the drawing machine 19 is combing and drafting the sliver 4, the position sensor 2 detects the uneven thickness of the sliver 4.
6, the unevenness is treated as an electric signal K, which is compared with a reference voltage corresponding to the reference thickness in a comparator circuit 50, and the difference is stored in an analog memory 52. Then, the set number of pulses after adjusting the delay time appropriately according to the analog voltage signal g.
When the same number of pulse signals m as Q' are input, the uneven reproduction signal l' is adjusted by the amplifier 54, the offset voltage adding circuit 55, and the electronic volume 56, and is made into the feedforward control signal j. The signal is sent to the unevenness adjustment adding circuit 36 via R13, and the rotation of the second motor 24 is controlled by adjusting the output of the second inverter 35 so as to eliminate the detected unevenness. As a result, when the position sensor 26 detects thick unevenness in the sliver 4, the rotation speed of the front roller pair 23 increases when the uneven part is discharged from the gill 21, and the draft rate temporarily increases. , the thickness of the sliver 4 discharged from the drawing machine 19 is made uniform. Conversely, when the position sensor 26 detects thin unevenness in the sliver 4, the rotational speed of the front roller pair 23 is slowed down when the uneven part is discharged from the sliver 21.
The draft rate temporarily decreased and the drawing machine 19
To make the thickness of the sliver 4 discharged more uniform.

As shown in FIG. 7, during soft start control or soft stop control, the output signal of the offset voltage addition circuit 55 is controlled in accordance with the analog voltage signal g input to the electronic volume 56 via the amplifier 57. , the final feedforward control signal j.

As mentioned above, the drawing machine 19 of this embodiment is
The drive sources that drive the feed roller pair 20 and gill 21 and the drive source that drives the front roller pair 23 are different, and while the two drive sources are synchronized, a constant rotational speed ratio is controlled to maintain the draft rate, and the sliver Measure the thickness unevenness of 4 Roller 2
5. Detected by the position sensor 26, the detected uneven portion is discharged from the gill 21, and while it reaches the front roller pair 23, the rotational speed of the front roller pair 23 is changed to eliminate the unevenness. The rotation of the pair 23 is controlled.

For this reason, when collecting a plurality of slivers 4 and combing and drafting them into a sliver 4 of a desired thickness, the draft rate can be easily changed by simply adjusting the volumes VR3 and VR4 without replacing gears, etc. Furthermore, the thickness unevenness of the relatively short sliver 4 as shown in FIG. 10a, which has been difficult in the past, can be eliminated and made uniform as shown in FIG. 10b. In this embodiment, it is possible to adjust the thickness unevenness of the sliver 4 over ±50% and make it uniform.

In the above embodiment, the rotation of the uneven front roller pair 23 is controlled, but on the contrary, the control signal b is directly output to the second addition circuit 33 as shown in FIG. At the same time, the control signal a is outputted to the first addition circuit 32 via the unevenness adjustment addition circuit 36', and the polarity of the feedforward control signal j outputted via the contact R13 is inverted by the inversion circuit 60. The feed forward control signal j' may be inputted to the unevenness adjusting addition circuit 36' to control the rotational speed of the feed roller body 20 and gill 21 to eliminate unevenness.

Next, a second embodiment of the present invention will be described.

In this embodiment, the rotation and electromagnetic brake control circuit 2
9' is constructed using a microcomputer, and will be described below with reference to FIGS. 12 to 14.

FIG. 12 shows a block diagram, in which reference numeral 80 indicates the first pulse generator 27, the second pulse generator 28, the power switch 31, and the volumes VR1, VR2, VR3'.
Input and calculate signals and set value data output from the first motor 22, the second motor 24, or the first, second,
A central processing unit (hereinafter simply referred to as CPU) that performs processing for controlling the operation of the electromagnetic brakes 43, 44, etc., 81 is a read-only memory (hereinafter simply referred to as ROM) in which the control program and necessary control data are stored. 82 is a random access memory (hereinafter simply referred to as RAM) in which data input to the rotation and electromagnetic brake control circuit 29' and calculation data are temporarily read and written; 83 is an input port (not shown); An input section equipped with a multiplexer that selectively inputs the signals of each volume, an A/D converter that converts the analog signal output from the multiplexer into a digital signal, etc., 84 is an input port (not shown), an output port, Input signal waveform shaping circuit, first and second
Motors 22, 24 and first and second electromagnetic brakes 4
3. Input/output section equipped with 44 drive circuits, 8
5 represents a bus line that interconnects the CPU 80, ROM 81, RAM 82, input section 83, and input/output section 84, and through which each data is transmitted.

Next, the flowchart of the control program is shown in the 13th section.
This will be explained with reference to FIG.

FIG. 13 shows the motor rotation control processing routine, which is the main routine, in which the power switch 31 of the drawing machine is turned on (reset), and first, in step 100, the soft start/stop control set by VR1 and VR2 is started. Draft rate data set based on the voltage level and the volume of VR3' is input.

Then, in the following step 101, VR
3' based on the draft rate set by
The frequency ratio of the pulse signals output to the motor 22 and the second motor 24, that is, the rotation speed ratio, is determined, and the first and second electromagnetic brakes 43 and 44 are turned on, and then in step 102, the rotation and electromagnetic brakes are turned on. The soft start/control circuit 29' will be described later.
Stop control processing is performed, and further step 103
It is determined whether the pulse output flag is set or not, and if it is not set, after stopping the pulse signal output to each motor 22, 24,
The process of this step 102 is performed again, and the pulse output flag is set to the soft start/soft start flag of the previous step 103.
Similar processing is repeated until it is set in the stop control processing routine. And step 10
If it is determined in step 3 that the pulse output flag is set, the process moves to the next step 104.

In step 104, a pulse signal with a predetermined frequency is applied to the first and second motors 22, 24.
Then, in step 105,
The actual rotational speed of each motor is detected from the pulse signal proportional to the rotational speed of the motor generated by the first and second pulse generators 27 and 28. Based on this rotational speed, the draft rate is adjusted in the next step 106. A judgment is made. If the draft rate matches the draft rate set in the volume VR3', the process directly proceeds to step 109,
Thereafter, the processing of this routine is repeated in the same way, and in step 106, the draft rate is set to VR.
If the draft rate is insufficient (smaller) than the draft rate set in step 3', the process of step 107 is performed to increase the draft rate, and the frequency of the pulse signal output to the second motor 24 is increased by a certain amount. , the process moves to step 109, and conversely, the draft rate is
If the draft rate is higher than the one set in VR3', take step 10 to lower the draft rate.
After performing the process of step 8 and reducing the frequency of the pulse signal output to the second motor 24 by a certain amount, the process moves to step 109. In the following step 109, the measurement roller pair 25 and the position sensor 26 detect the thickness unevenness of the sliver 4, and the detected analog data is converted into digital data.
The data is stored in a predetermined area in the RAM 82, and in the next step 110, unevenness data detected and stored a predetermined time ago according to the distance from the measuring roller pair 25 to the tip of the gill 21 or the rotational speed of the first motor 22 is stored in the RAM 82. taken out and played.

Then, in accordance with the reproduced unevenness data and the draft rate, the current pulse frequency is increased or decreased in step 111, and then in step 10 described above.
Proceed to step 2.

By performing such processing, the thickness unevenness of the sliver 4 is eliminated and the sliver 4 is made uniform, and the sliver 4 is carded and drafted to a desired draft rate.

Next, FIG. 14 shows a flowchart for performing "soft start/stop control" processing showing electromagnetic brake control by the rotation and electromagnetic brake control circuit 29'.

When the processing of this routine is executed, Step 2
It is determined whether a predetermined period of time has elapsed since entering the soft start control or soft stop control in step 01, and if it is determined that the predetermined period of time has elapsed (time up), the soft start or soft stop control is no longer necessary. Since it is determined that this is the case, the processing of this routine is immediately terminated.

On the other hand, if it is determined that the predetermined time has not elapsed, then the process moves to step 202.

In step 202, it is determined whether the current process is a process for performing a soft start or a process for performing a soft stop, based on the state of the power switch 31.
03, the frequencies of the pulse control signals output to the first and second motors 22 and 24, which have already been determined, are each set at a fixed rate, for example, 5%.
In the following step 204, it is determined whether the pulse control signal output to the first motor 22 has reached the frequency of the predetermined brake release level set by VR1, and if the determination is "NO", then If it is determined that the frequency is at the predetermined brake release level, the pulse output flag is set in step 205, and the first and second electromagnetic brakes are activated in step 206. 43 and 44 are canceled (OFF) to end the processing of this routine.

On the other hand, if it is determined in step 202 that soft stop processing is currently requested, the process proceeds to step 207, where output is output to the already determined first and second motors 22 and 24. The frequency of the pulse control signal output to the first motor 22 is decreased by a fixed rate, for example, 5%, and in the subsequent step 208, the frequency of the pulse control signal output to the first motor 22 is set to the frequency of the predetermined brake operation level set in VR1. It is determined whether or not you have become accustomed to it, and the answer is "NO".
If it is determined that the frequency is at the predetermined brake operation level, the process of this routine is immediately terminated, and if it is determined that the frequency is at the predetermined brake operation level, at step 209,
At the same time as resetting the pulse output flag, at the subsequent step 210, the first and second electromagnetic brakes 4 are activated.
3 and 44 are activated (ON) to complete the processing of this routine.

Therefore, soft start and soft stop control of the first motor 22 and the second motor 24 can be performed by the process shown in the flowchart of FIG. 14 above.

As described above, the rotation and electromagnetic brake control circuit 29' also has a microcomputer configuration.
Control similar to that is possible.

As described in detail above, the drawing machine 11 of this embodiment stops the rotation of the motors 22 and 24 by the electromagnetic brake 2 at the time of starting.
43 and 244, and when a predetermined brake release level is reached, the operations applied to the two motors 22 and 24 are simultaneously released. In other words, since it is possible to start and stop the motors 22 and 24 at a point where the loads on both rollers are equal, that is, at a level where the torque of the motors 22 and 24 is generated to some extent, the motors 22 and 2 can be started and stopped without being affected by the loads on both rollers.
4 rotates smoothly, and the rotational speed ratio of both motors 22 and 24 is controlled to be constant. and both motors 22,
If the rotational speed ratio of 24 is constant, the thickness of the sliver will be uniform because the thickness of the sliver will be uniform. Therefore, it is possible to prevent the sliver from being entangled or cut during starting and stopping.

Next, a third embodiment of the present invention will be described with reference to FIG. 15.

This embodiment is equipped with a feed roller pair 20, a gill 21, and a first motor 22 for driving them as in the previous embodiment, and in place of the front roller pair 23 of the first embodiment, two pairs of front rollers 2 are provided.
3A, 23B are replaced with the measuring roller pair 25, two pairs of measuring rollers 25A, 25B are used as the position sensor 2.
Two position sensors 26A and 26B are provided in place of the position sensor 6, and the respective front roller pairs 23A and 23B are
This figure shows a case where two slivers 4A, 4B can be combed and drafted by one drawing machine 50 at completely different draft rates. Therefore, the rotation and electromagnetic brake control circuit (not shown) includes two circuits as shown in FIG. 6.

In addition, the rotation and electromagnetic brake control circuit 29, 2
9', an unevenness detection section, a pair of front rollers, and a large number of second motors 24 as necessary.
Combing and drafting of slivers with various draft rates can be performed simultaneously with one drawing machine. Alternatively, the front roller pair 23 may be made into a pair, and a plurality of gills 21 and feed roller pairs 20 may be provided so that drafting can be carried out between the gill 21 and the feed roller pair 20.

According to the present embodiment described above, it is possible to comb and draw multiple slivers with different draft rates using one drawing machine, and the installation space is required to be approximately that of one machine, making it economical. This makes it possible to provide a drawing machine with high performance.

The above description has been made with particular reference to a drawing machine, but it goes without saying that the mechanism of the above embodiment can be applied not only to a drawing machine but also to a spinning machine in a subsequent process.

[Effects of the invention] As detailed above, the spinning machine of the invention is
As shown in Figure 7, when the spinning machine is started, if the control signal supplied to the motor is below a predetermined brake release level, the rotation of the motor is stopped by the electromagnetic brake, and only when the predetermined brake release level is reached, the electromagnetic brake is released. On the other hand, when the spinning machine is stopped, if the control signal supplied to the motor is greater than the predetermined brake activation level, the electromagnetic brake is released and the motor rotates, and when the predetermined brake activation level is reached, the electromagnetic brake is activated. It is equipped with an electromagnetic brake control circuit that operates the brake. 1st
As shown in Figure 7, if the torque at the start is weak, stop both motors with the electromagnetic brakes, and when the motors produce a certain amount of torque, release the electromagnetic brakes on both motors and let them rotate. It becomes easier to match the rotational speed. Also, when stopping, the electromagnetic brakes on both motors are released and the motors are rotated until a certain amount of torque is produced, and when the torque becomes weak, stopping both motors with the electromagnetic brake will reduce the rotational speed ratio of both motors. It becomes easier to get everything together. Therefore, a uniform sliver as shown in FIG. 18 can be manufactured.

In addition, the spinning machine of the present invention drives the feed roller pair and the front roller pair with separate motors that can control the rotational speed, and also reduces the uneven thickness of the sliver that is combed and drawn on the upstream side of the fiber processing section. The draft rate, that is, the conveyance speed ratio between the feed roller pair and the front roller pair is precisely changed in accordance with the detected and memorized unevenness. Therefore, the draft rate can be changed quickly without changing gears like in the past, and the uneven thickness of the sliver can be adjusted over a wide range from short to long, thick to thin. The sliver can be made evenly and evenly, and a sliver with a good finish can be processed. In addition, since the gear ratio is not fixed by gears, etc., the draft rate can be set completely freely, and the cost is lower than that of incorporating a continuously variable transmission or assembling gears into a complicated configuration. The noise is low and the weight of the device can be reduced.

Furthermore, by providing multiple pairs of feed rollers or pairs of front rollers for one gill, it is possible to draft and comb multiple slivers with a single spinning machine, each with a different draft rate. Therefore, it is possible to obtain excellent effects such as improvement of device capacity and ease of securing installation space.

[Brief explanation of the drawing]

Figure 1 is a schematic configuration diagram showing a conventional drawing machine, Figure 2
3 and 3 are schematic diagrams showing the configuration of a gill, FIG. 4 is a schematic diagram showing a conventional unevenness storage device, FIG. 5 is a schematic diagram showing the drawing machine of the first embodiment of the present invention, and FIG. 7 is a block diagram showing details of the rotation and electromagnetic brake control circuit, FIG. 7 is a graph showing the output timing of the brake signal h and the voltage waveform of the control signal, and FIG. 8 is a graph showing the output timing of the brake signal h and the voltage waveform of the control signal. FIG. 9 shows the control signal that is the output of the second addition circuit 33 when the second motor 24 is controlled to maintain a predetermined draft rate by feedback control. b', FIG. 10 is a graph explaining the operation of the first embodiment, FIG. 11 is a block diagram of the main part when the rotation of the feed roller pair 23 is constant, and FIG. 12 is the second embodiment of the present invention. A block diagram showing the rotation and electromagnetic brake control circuit of the embodiment, FIGS. 13 and 14 are flowcharts of the control program, FIG. 15 is a schematic diagram showing the third embodiment of the present invention, and FIG. 16 is a diagram showing the control program from the inverter. A time chart of the pulse output to the motor, Fig. 17 is a time chart of the rotational speed of the first motor and the second motor,
Figure 18 is a front view of the sliver and rollers when starting and stopping, Figure 19A is an explanatory diagram of the conventional one-motor drawing machine and the sliver of the present invention during steady operation, and Figures B to E are the front views of the sliver and rollers when starting and stopping. FIG. 2 is an explanatory diagram of the sliver when synchronization cannot be achieved when starting and stopping a two-motor type drawing machine. 1, 20...Feed roller pair, 2, 23, 2
3A, 23B... Front roller pair, 3, 21...
...Gill, 4,4A,4B...Sliver, 22...
...First motor, 24...Second motor, 25...Measuring roller pair, 30...Central control unit, 34...First
Inverter, 35...Second inverter, 52...
Analog memory, 29, 29'... Rotation and electromagnetic brake control circuit, 43, 44... Electromagnetic brake.

Claims (1)

[Scope of Claim for Utility Model Registration] A pair of feed rollers that conveys the sliver, a thickness unevenness detection section that detects thickness unevenness of the sliver, and sequential storage of the sliver thickness unevenness detected by the thickness unevenness detection section. a first rotational drive source that drives the feed roller pair; a front roller pair that conveys the sliver while drawing it from the feed roller pair; a second rotational drive source that drives the front roller pair; an electromagnetic brake that brakes the rotations of the rotational drive source and the second rotational drive source, synchronizing the rotation of the one rotational drive source with the rotation of the other rotational drive source at a predetermined rotational speed ratio, and a rotation control circuit that controls the rotation of the two rotational drive sources according to the uneven thickness of the sliver stored in the storage unit so that the thickness of the sliver output from the front roller pair is constant; When the control signals output to the first rotational drive source and the second rotational drive source reach a predetermined brake release level, the electromagnetic brakes for both of the drive sources are simultaneously released, and when the spinning machine is stopped, an electromagnetic brake control circuit that simultaneously starts operating electromagnetic brakes for both of the drive sources when a control signal output to the first rotation drive source and the second rotation drive source reaches a predetermined brake operation level; A spinning machine characterized by being equipped with the following.