JPS5947714A - Electromagnetic solenoid drive circuit for sewing machine drive unit, etc. - Google Patents

Abstract

PURPOSE:To simplify a drive circuit and reduce the number of its switching element by such an arrangement wherein No.2 switching element for driving an electromagnetic solenoid is connected in parallel to No.1 flywheel circuit, and at the same time, it is connected to a DC power source through No.1 switching element for chopping, and further No.2 flywheel circuit connected in parallel to the electromagnetic solenoid is connected to No.2 switching element. CONSTITUTION:When a DC signal is given to the input terminal (j) of a transistor 109, the transistor 109 is turned on. At this time, said DC signal is also given to a pulse circuit 113, therefore single pulse is given to OR gate 103. As a result of this, a transistor 106 is caused to become conductive condition continuously through a circuit of a transistor 105 and resistors 104, 104' while single pulses are being generated, regardless a signal from an oscillating means 102, and an electromagnetic solenoid is electrified and performs perfect operations. Upon completion of single pulses, the transistor 106 repeats ON and OFF by the output of the oscillating means 102 and the electromagnetic solenoid is impressed with a chopped voltage.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sewing machine drive device equipped with an electromagnetic solenoid F that is mounted on a sewing machine driven by an electric motor and used for backstitching. Related to the important solenoid drive circuit in etc.

Conventional configuration and its problems In general, sewing machine control, and in particular control of industrial sewing machines, uses an electric motor to control the sewing speed, the sewing speed, and the speed of the sewing machine. This is done by operating an electromagnetic solenoid attached to the controller.The control technology is improving year by year as technology advances. However, on the other hand, there is little room for improvement in the electromagnetic solenoid, which is the driving part, and the delay in response and unevenness of the electromagnetic solenoid are one of the bottlenecks in creating a highly accurate sewing machine drive system. It has become. For example, if we take an electromagnetic solenoid for reverse stitching, the response delay is the same as when sewing reverse stitches.
1, which tends to be a fatal problem when it comes to formation.
The response delay of an electromagnetic solenoid can be considered to be due to mechanical factors and electrical delays, but if we focus only on the latter, the following can be said.

First, the response time when the drive signal is manually operated is naturally a function of the applied voltage. In order to obtain a faster response, it is desirable to increase the applied voltage as high as possible and use it in a so-called overvoltage condition.

However, in this case, there is a problem of temperature rise, and it cannot be used continuously for a long time. As a solution to this problem, turn on the electromagnetic solenoid after suction ends.

Applying an intermittent OFF voltage to perform so-called Choso Bink control is a commonly used technique (4. are shown in Figures 2 and 4, respectively.

In FIG. 1, 1 is a DC power supply, 21d- is an electromagnetic solenoid, 3 is 1 to run sister, and 4 is a flywheel tie-off 1-. In FIG. 2, B shows the human input waveform of the input terminal ib of the transistor 3, C shows the waveform of the current flowing through the electromagnetic solenoid 2, and D shows the operating time of the electromagnetic solenoid 2. When the input terminal shown in FIG. 2B is input manually, the 1-run sister 3 turns on and off.
When on 11h, electromagnetic solenoid 1 to 2.1-run shift/evening 3, DC power supply 1 circuit, and when off, electromagnetic solenoid 1-2
, the current flows through the circuit of diodes 1-4 as shown in FIG. 2G, and the electromagnetic solenoid 2 operates. child! diode 4
Since no series impedance is connected to the transistor 3, the discharge time constant when the transistor 3 is off is large, and a current waveform with relatively few ripples can be obtained as shown in FIG. 3C. Therefore, during the chopping operation, there is relatively little buzzing noise from the electromagnetic solenoid, and good results can be obtained. On the other hand, at time t4, when a signal is issued to reset the electromagnetic solenoid 1-'', the current naturally decreases slowly, resulting in an off response time t5-'' of the electromagnetic solenoid 1-''.
t4 comes late.

On the other hand, FIG. 3 is the same as the example in FIG. 1 except that an impedance 5 is inserted in series with the diode 14, and the same parts are given the same numbers and their explanation will be omitted. If impedance 5 exists in this way, the discharge time constant becomes small,
The current waveform flowing through the electromagnetic solenoid 2 has a relatively large ripple as shown in Fig. 4 C', which increases the risk of the electromagnetic solenoid 2 emitting a loud noise, and the power loss at the impedance 5 cannot be ignored. It has the disadvantage that it becomes 1. However, on the other hand, at time t4, the electromagnetic solenoid 2
When a signal is given to restore the OFF response time, the delay time 15-14 of the OFF response time should naturally be a small value, as shown in FIG. 4D'', and better response characteristics can be obtained than in FIG. .As a solution to these conflicting problems in Figures 1 and 3, we have developed an electromagnetic solenoid (both during chopping and when off) V circuit (diodes 1-4 and impedance 5 circuit in Figure 3). An example of a circuit that has been conventionally used is shown in FIG. 6, and its operating waveforms are shown in FIG. 7.

In FIG. 5, 21 is a DC power source, 22 is an electromagnetic solenoid, and 23 is a mechanism for moving the electromagnetic solenoid.
Tunshisk, 24 is a diode for flywheel, 25
is an impedance element such as a resistor r126 represents the transistor 1 to ζ which shows the impedance element 25.
Human power (verbal waveform, D″i: human power waveform to the input terminal Ib″ of l/transistor 23, C1/ is the current waveform flowing through the electromagnetic solenoid 22, D″ is? I: Magnetic strain, Noi 12
2 operations are shown respectively.

Now, the copy shown in Figure 7B is applied to the human end A,
When the 1-rise register 23 is turned on at time t1'', then J''L
- The l-range nut 26 is turned on in synchronization with -. When transistor 26 is turned on, impedance element 25 becomes short-circuited, resulting in a circuit equivalent to that shown in FIG.

From time t3'', the transistor 23 starts to perform pink operation, but at this time the circuit is in a state equivalent to that shown in Figure 1 as described above, so the current flowing through the electromagnetic solenoid 22 is as shown in Figure 7 C''. The result is a good one with less ripple. On the other hand, time 1. When // is reached and a signal is input to restore the electromagnetic solenoid, the transistor 26
is not in the off state, resulting in the circuit being in the state shown in FIG.

Therefore, the current of the electromagnetic solenoid is quickly reduced, and good response characteristics with little delay can be obtained.

As mentioned above, if the circuit shown in Fig. 5 is used, the shortcomings of the respective circuits of Figs. 1 and 3 described above can be covered and good operation of the electromagnetic solenoid can be obtained. It has the following drawbacks.

(2) Since it is necessary to synchronize the transistor 26 with the transistor 23, an additional synchronization circuit is required.

(fi), Since the l-run transistor 26 and the transistor 23 constitute a circuit, I am trying to drive multiple 'electromagnetic solenoids.
One by one, 1-La 7 sister is a must-have.

The above drawbacks become more of a problem as the number of electromagnetic solenoids to be driven increases.

Note that in FIG. 6, the transistor 26 in FIG.
This figure shows an example in which the Swiss tinc element 2a such as R is replaced, and other points are the same.

OBJECTS OF THE INVENTION The present invention aims to provide a more desirable sewing machine drive device, etc. by eliminating the synchronous circuit and suppressing the increase in switching elements in the conventional example described in -1- and making an electromagnetic solenoid respond with a simple circuit purchase. It is something.

Structure of the Invention The present invention connects a second main notching element for driving an electromagnetic solenoid in parallel with the first flywheel circuit, connects it to a DC power source via a first notching element for chopping, and further connects the electromagnetic solenoid 1 and A second flywheel circuit connected in parallel is connected to a second neutralizing element.

DESCRIPTION OF EMBODIMENTS The structure and operation of a circuit according to the present invention will be explained below based on embodiments.

FIG. 8 shows an example of a circuit according to the present invention, and FIG. 9 shows its operating waveforms. Further, FIG. 10 shows a more specific example of the circuit shown in FIG. 8.

In FIG. 8, 41 is a DC power supply, 42 is a first switching element for chopping (represented by a transistor here), 43 is a diode for the first flywheel connected in series with the switching element 42, 44 and 48 is an electromagnetic solenoid, 46 and 49 are the electromagnetic solenoids 44.
48 respectively, a second switching element (
46 and 50 are impedance elements, and 47 and 51 are diodes for the second flywheel, which are connected in series to the impedance elements 46 and 60 and in parallel to each electromagnetic solenoid 44 and 48. 3. FIG. 9 E is the input terminal waveform to the input terminal e of the first switching element 42, F is the second main switching element 45
0 input terminal - input terminal waveform to rf, G is 71 magnetic solenoid 440'' 11L flow waveform, H is second switching element 4
The input terminal waveform to the input terminal 9 is shown, and ■ indicates the current waveform of the electromagnetic solenoid 48.

At minute time tlo, in order to operate the electromagnetic solenoid 44, a signal having the waveform shown in FIG. Applying a signal with the waveform shown in E, 1-
After the transistor 42 becomes conductive until time 1++, the pink operation begins.

At this time, the flywheel/lif flow of the electromagnetic solenoid 44 during the chopping operation is caused by the diode 4 for the first flywheel.
3, a good current waveform with less ripple is obtained. -When the force 11r reaches time t12 and a signal is input to the input terminal (f) to return the electromagnetic solenoid 44, the l transistor 45 turns off, and the energization to the electromagnetic solenoid 44 stops 1. Electromagnetic solenoid 4
The flywheel circuit No. 4 is inevitably switched to a second flyboil circuit consisting of a series circuit of a diode 47 and an interference element 46. As a result, the direct current flowing through the electromagnetic solenoid quickly decreases, resulting in good response characteristics.

The operation of the electromagnetic solenoid 44 has been explained above, but
The same can be said for the operation of the electromagnetic solenoid 48. Even if more electromagnetic solenoids are connected in the same way, the above-described operation holds true for the fidget 71j: magnetic solenoid. However, at this time, it is necessary that the respective electromagnetic solenoid operations do not overlap in time.

The present invention has been briefly explained above, and below, a more specific circuit configuration and operation will be explained based on FIG. 10.

In FIG. 10, 101 is a DC power supply, 102 is an oscillation means for generating a chopping signal, 103 is an OR gate for taking O of the oscillation means and a pulse circuit to be described later, and 104, 104' and 105 are 1 is a drive means for driving the 106 element, and in this circuit example, each resistor.

JJHji and 1-Ransisk, 106 ij, the first main node element for chopping (represented by a transistor here), 10A is the quarto element for the first flywheel, 108 and 114 are the base resistors, 109 and 1
15 is a second suinotinku element-r for driving an electromagnetic solenoid.
(represented here by transistors), 110 and 11
Reference numeral 6 represents a 7F magnetic solenoid, 111 and 117 represent impedance elements, 112 and 118 represent diodes for the second flywheel, and 113 and 119 represent pulse circuits that generate Φ metal pulses of a constant width.

Now, in order to operate the electromagnetic solenoid 110, when a bending signal is manually applied to the input terminal Ij of the l-run nut 109, the l-run nut 109 is turned on. At the same time, the DC signal is also input to the I-no pulse circuit 113, and a single pulse is input to the OR gate 103.

As a result, the transistor 105, the resistors 104, 104
While the intermediate pulse is being outputted, the 1-range nut 106 becomes continuously conductive through the circuit ', regardless of the boost from the oscillation means 102, and the electromagnetic solenoid 110 is energized, preventing complete operation. 1) After the completion of the optical pulse during writing 1), the output of the oscillation means 102 turns the 1-run signal generator 106 on and off, and the electromagnetic solenoid 110
A chopped voltage is applied to. At this time, the flywheel circuit flow is the diode 1-107 for the flywheel.
A good current flows through the 'NU magnetic solenoid with less ripple.

On the other hand, when a signal is input to the input terminal Ij to restore the electromagnetic solenoid 110, the transistor 109 is turned off, and at the same time, the flywheel circuit is switched to a series circuit of the impedance element 111 and the flywheel diode 112, and the current immediately increases. Good responsiveness is obtained due to the decrease in

The operation of the electromagnetic solenoid 116 is similar to that of the electromagnetic solenoid 1.
This is explained in 10 operations.

In the circuit shown in FIG. 10, if the oscillation means 102 is constituted by an oscillation circuit whose oscillation period can be varied, a 7-day pink period can be obtained that is suitable for an electromagnetic solenoid.

Effects of the Invention Does the present invention have the following features? 1st evening 71, (1) What is the first Suinochinku base for Chiyono Pink?
IJ: Magnetic solenoid Since the switching element for driving the solenoid is separated, the circuit can be simplified.

(2) The second switching element for driving the H-magnetic sononoid also functions as a switching element for the Norai foil circuit cut-off PIF river, and as a result, it is possible to avoid reducing the number of switching operations. , /) - Therefore, the greater the number of electromagnetic solenoids, the longer the effectiveness.

[Brief explanation of the drawings] Figure 1 shows a conventional sewing machine! A circuit diagram of the first example of the 711:fB solenoid drive circuit at
21i21 &:l: Its operating waveform diagram, Figure 3 is the same (
7. The circuit I of the second example 1, FIG. 4 is its operating waveform diagram, and FIG. 6 is a circuit diagram of a fourth example of the conventional example in which the transistor 26 in FIG. 6 is replaced with an element 36 such as an SCR, FIG. 7 is an operating waveform diagram of the circuit in FIG. 6, and FIG. The figure is a circuit diagram of an embodiment of an electromagnetic solenoid drive in a sewing machine drive device or the like of the present invention, FIG. 9 is an operating waveform diagram thereof, and FIG. 10 is a more specific circuit diagram of FIG. 8. . 44.48,110,116・・Electromagnetic 1st solenoid, 42,106・・・1st switch solenoid, 46
．． 49,109,115...Second sinotinck element, 43,107...First flywheel circuit (diode), 47,51,112,118...Second
Flywheel circuit (diode'), 46°50.1
11,117...To Invida. Name of agent: Patent attorney San Nakao Ri3 and 1 other person Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 5

Claims (4)

[Claims] (1) 'lIf magnetic solenoid 1- and this solenoid 1
-' and is controlled to repeatedly turn on and off periodically; a first flywheel circuit connected to the first switching element I;
A second switching element is connected in parallel with the flywheel circuit, and a second switching element is connected in series to the second switching element. 1. A magnetic solenoid drive circuit for a sewing machine drive device, etc., which is equipped with a magnetic solenoid and a second flywheel circuit connected in parallel to the electromagnetic solenoid. (2) An electromagnetic solenoid drive of the sewing machine drive device 1'1 or the like according to claim 1, wherein a constant is set so that the impedance of the first flywheel circuit is smaller than the impedance of the second flywheel circuit. circuit. (3) Connect the second switch element to each electromagnetic solenoid 1-
An electromagnetic solenoid 1 drive circuit for a sewing machine drive device or the like according to claim 1, in which a plurality of electromagnetic solenoids are connected in parallel. (4) 1) An oscillation circuit capable of using the first switching element -r described in iJ as an oscillation layer Jν] and a Parnu circuit that generates a neutral voltage in synchronization with the operation of the second main switching element A. 4"+1'j'l' produced by OR circuit 1:j
An electromagnetic solenoid drive circuit for the sewing machine drive device according to the first item of the request.