JPH04102725A - Controller of electromagnetic tooth clutch - Google Patents

Abstract

PURPOSE:To simplify release by setting a plural number of applied electric currents of an electromagnetic tooth clutch, selecting a desired setting value, commanding a steering drive and selecting a setting value suitable for a drive condition. CONSTITUTION:An electromagnetic tooth clutch 10 is installed with a rotor 1 free to rotate on the inside of a stator 3 installed with an exciting coil 4, and a magnetic circuit S is formed between the rotor 1 and an armature 5. An adapter plate 8 on the driven side is fixed on the armature 5. An input shaft and an output shaft are connected to each other by engagement of tooth rings 7, 6. A rotation drive unit is rotated by way of selecting a desired setting value from a setting circuit to set a plural number of applied electric currents on an exciting coil by a selection circuit. Connection with a driven unit is released by way of selecting and commanding a setting value suitable for this drive condition by a change-over control circuit. Accordingly, no torque limiter is required and it is possible to easily release it.

Description

Detailed Description of the Invention [Object of the Invention] a) Industrial Application Field The present invention relates to a control device for an electromagnetic tooth clutch interposed between a rotary drive device and a driven device, and particularly relates to a control device for an electromagnetic tooth clutch interposed between a rotary drive device and a driven device. The present invention relates to an electromagnetic tooth clutch control device that can engage and disengage a clutch with a desired disengagement torque suited to the state.

b) Prior Art In this type of electromagnetic tooth clutch, it is necessary to engage and disengage the clutch with a desired disengagement torque in order to prevent generation of excessive load torque.

For this reason, there are some conventional clutches in which an electromagnetic tooth clutch is provided with a mechanically actuated torque limiter in several stages, as disclosed in, for example, Japanese Utility Model Publication No. 53-48941.

In addition, in order to perform this torque limiter function electrically by the electromagnetic tooth clutch itself, the present applicant previously filed a patent application.
There is also a device in which the excitation coil of the electromagnetic tooth clutch proposed in No. 281890 is supplied with an applied current necessary for overload protection operation during steady operation.

C) Problems to be Solved and Attempted by the Invention However, in the former mechanically operated L-L limiter, the assembly may become unstable due to precision or long-term use, and may require maintenance or inspection work. There are some problems, such as being complicated or complicated.

In addition, for both the former and the latter, even if the release torque is set so that the desired overload protection is activated during steady operation, there may be cases where the machine accelerates, decelerates, stops suddenly, or inching, such as in a stamping machine. If operation is required,
Since it is necessary to reset I7 to a corresponding disengagement torque, it is impossible to follow these various operating conditions and perform the desired overload protection operation.

However, even during steady operation, it is necessary to reset the torque limiter release torque depending on the load conditions on the output side.
In this case, the machine had to be stopped.

SUMMARY OF THE INVENTION Therefore, the present invention aims to provide an electromagnetic tooth clutch control device for solving these conventional problems.

[Structure of the invention]

a) Means for Solving the Problems The gist of the present invention is to interpose an electromagnetic tooth screw between a rotary drive device and a driven device, to interlock with the rotary drive device (2) to follow the driven device, and to Control the applied current of χ・1 to the excitation coil of the electromagnetic two-scratch,
The desired departure!・With the control device which operates the clutch to engage and disengage, there is a setting circuit that can set the applied current of the front sear excitation coil to a plurality of values, and a desired setting value is selected from this setting circuit. a set value selection circuit, and a switching control circuit that instructs the rotary drive device to perform a desired rotational drive; This is the control position for the electromagnetic tooth clutch.

b) Effect In each setting circuit, the applied current value of the excitation coil required for the release torque corresponding to various operating states of the rotary drive device such as a motor can be set during operation or stop. When the drive state of the rotary drive device is switched by the switching control circuit, each set value is selected by the set value selection circuit and applied to the excitation coil of the electromagnetic tooth clutch.

Therefore, if the load torque becomes excessive in any operating state, the electromagnetic tooth clutch can immediately respond to this and release the connection between the rotary drive device and the driven device.

C) Examples The present invention will be explained in detail below based on the illustrated examples.

First, the electromagnetic tooth clutch 10 used here is rotatably attached to the rotor 1 through a ball bearing 2 inside the stator 3 on which the excitation coil 4 is attached, for example as shown in riJ3 figure (a). When the excitation coil 4 is energized, a magnetic circuit S is formed between the stator 3, rotor 1, and armature 5. Further, the armature 5 is fixed to an adapter plate 1/-1-8 via a leaf spring 9, and a driven side boob, gears, etc. are attached to this adapter plate 8.

Then, in step 7, when the excitation coil 4 is energized, it is drawn toward the armature 5 or the coil 4, and as shown in FIG. 3(b), the last ring 6 @6A fixed to the armature 5 is fixed to the rotor 1. It meshes with the teeth 7A of the tooth ring 7 to connect the human power shaft and the output shaft, and torque is transmitted from the driving side to the driven side. Furthermore, when the excitation coil 4 is de-energized, the magnetic flux of the magnetic circuit S disappears and the leaf spring 9 is released from the armature 5 or the rotor 1 by the restoring force, and the engagement between the tooth rings 6 and 7 is released and the driven side Torque is no longer transmitted to.

A flange 11 is provided on the outer periphery of the tooth ring 6 fixed to the armature 5, as shown in FIG. is provided. This sensor] 2 is, for example, a proximity sensor equipped with a light emitter and a light receiver, and a bracket 13 is attached to a fixing member (not shown).
It is attached via. The sensor 12 receives the reflected light of the optical signal irradiated 17 from the projector to the flange 11 by the receiver and converts it into an electrical signal, and depending on the strength of the signal, the sensor 12 adjusts the positional distance L1 of the tooth ring 6 or the tooth ring 7 to be engaged with the tooth ring 6 or the tooth ring 7. It is detected whether it is present or within the position interval L2 of the released state.

Next, a method of controlling the electromagnetic tooth clutch 10 will be explained with reference to the block diagram in FIG. 1 and the waveform diagram in FIG. 2.

In this electromagnetic tooth clutch 10, the disengaging torque T for clutch operation is determined in direct proportion to the applied current (2) applied to the excitation coil 4. Therefore, in this application, a plurality of desired output torques can be selected depending on the operating condition of the motor. The circuit is configured such that the applied current necessary for each clutch operation can be set within the range of the minimum holding current and the maximum rated current.

The setting circuit 14 in FIG. 1 sets various reference currents Is for determining the applied current 1d necessary to energize the exciting coil 4 and disengage the electromagnetic tooth clutch 10 when it is overloaded. . This setting circuit 14 includes, for example, an inching setter 14a that sets a reference current (inching signal) Sl necessary for determining the disengagement torque T1 during inching, and an inching setter 14a that sets the reference current (inching signal) Sl necessary for determining the disengagement torque T2 during acceleration. An acceleration setting device 14b that sets a reference current (acceleration signal) S2, a deceleration setting device 14c that sets a reference current (deceleration signal) S3 necessary to determine the withdrawal torque T3 during deceleration, and a deceleration setting device 14c that sets the reference current (deceleration signal) S3 for determining the withdrawal torque T3 during deceleration. A steady operation setting device 14d that sets the reference current (steady operation signal) S4 necessary to determine the torque T4, and a reference current (sudden stop signal) S5 necessary to determine the withdrawal torque T5 at the time of sudden stop. A large number of setting devices such as the sudden stop setting device 14e are provided,
Each setting device can change the setting value arbitrarily.

The set value selection circuit 15 selects one of the setters 14a to 14e according to a command from the switching control circuit 16, and outputs an inching signal S, an acceleration signal S2. Deceleration signal S3. Steady operation signal S4. A corresponding one of the sudden stop signals S5 is outputted to the comparison circuit 17 as a reference current Is.

The switching control circuit 16 includes, for example, non-lock type operation switches SWI and SW arranged on the control panel 20 that give switching commands for inching, acceleration, deceleration, and sudden stopping.
2, SW8, and SW5, and a steady operation display lamp PL that displays when the motor reaches the steady operation rotation speed by operating the acceleration operation switch.

When one of these operation switches is selectively operated, a corresponding command signal Sx from the switching control circuit 16 can cause the set value selection circuit 15 to output a desired reference current Is, and this command signal Sx is transmitted to the inverter circuit. A corresponding drive command is given to the motor 19 via the motor 18. Incidentally, when the acceleration operation switch SW2 is operated and the motor reaches the rotation speed for steady operation, a confirmation signal So is fed back from the inverter circuit 18 to the switching control circuit 16, and the steady operation setting value is selected based on this. A command is sent to the set value selection circuit 15.

The switching control circuit 16 also includes, for example, a lock type start switch SWO disposed on the control panel 20.
By operating this start switch, the switching control circuit 16 gives a command signal SO for engaging the clutch to the set value selection circuit 15, and the set value selection circuit 15 outputs a start signal P1.

This starting signal P1 includes an applied current a for promoting starting which has different peak values before the applied current for setting disengagement torque, an applied current for promoting connection, an applied current C for disengagement holding, and disengagement holding by the minimum coupling current. The applied current d is a set of pulse waveforms that change over time, and by sequentially applying this starting signal P1 to the excitation coil 4 of the electromagnetic tooth clutch 10, the operation at the time of starting the electromagnetic tooth clutch 10 is controlled. It is stabilizing. That is, first, in order to shorten the suction time of the armature 5, an applied current is applied to promote starting by a peak value a so that the tooth ring 6.7 quickly starts engaging and operating at the same time as the excitation coil 4 is energized. Then, in order to reduce the sliding torque between the teeth 6A and 7A of the tooth ring 6.7 which are attracted by the wave height value a and engage with each other, to prevent tooth wear and to reduce heat generation due to the energization of the excitation coil 4, the wave height value is reduced. An applied current is applied to promote the connection by (-1).Then, an applied current is applied to maintain the separation by a peak value C to prevent the engagement between the tooth rings 6 and 7, which are rotated and driven in the connected state, from being separated by the rotation start torque. Finally, an applied current is applied to maintain the connection at a peak value d necessary to maintain the detachment holding torque TO and maintain the engagement between the tooth rings 6 and 7.
Since it is necessary to change the energization time for the peak value a and the peak value C depending on the load, the energization time can be arbitrarily set variably within the setting value selection circuit 1-5, for example.

When the armature position detection circuit 22 is brought into a state in which the tooth ring 6.7 is engaged by the start signal pI,
An electrical signal from the sensor 12 that detects this is input, and based on this, a position detection signal P2 is generated and output to the set value selection circuit 15.

This position detection signal P2 acts at 1° with respect to the command signal Sx from the switching control circuit 1-6 (7) and a kind of gate signal, and the clutch is engaged by the start signal P1, and the position detection signal Unless P2 is input to the set value selection circuit 15, the set value selection circuit 15 does not function even if each operation switch of the switching control circuit 16 is operated (7).

Therefore, the clutch is brought into the engaged state by the starting signal P1, and then the switching control circuit 16 is operated 17, and each signal 5l is set to a desired value by the setting circuit 14 according to the command.
-55 is selected and the reference current i is selected from the set value selection circuit 15.
s are sequentially output to the comparison circuit 17.

The comparison circuit 17 sequentially compares this reference current Is with a current obtained by feeding back the applied current Id that is actually energized to the excitation coil 4 of the electromagnetic tooth clutch 10, and makes corrections based on the results of this comparison. The necessary correction current No. is output to the pulse generation circuit 23 at the next stage. This correction current Io includes, for example, a reference current Is and a deviation current Δi between the reference current Is and the applied current Id fed back.

The pulse generation circuit 23 converts the correction current No. sequentially sent from the comparison circuit 17 into a correction pulse signal Ip and outputs it to the next stage drive circuit 24. This correction pulse signal rp is, for example, converted from an analog peak value of the reference current Is into a digital signal with a corresponding pulse width, and converts the analog peak value of the deviation current Δ1 into a digital signal with a corresponding pulse width. It is created by adjusting the pulse width by using a correction pulse signal that has been A-D converted into a digital signal.

The drive circuit 24 sequentially converts the corrected pulse signal Ip into an analog value of the peak value corresponding to the pulse width, and applies this to the excitation coil 4 of the electromagnetic tooth scratch 0 as an applied current 1d. If this applied current 1d tries to fluctuate during driving, it will be corrected sequentially based on the comparison results.
In particular, it is possible to keep the applied current d for setting the disengagement torque constant from changing due to the temperature rise of the excitation coil 4 due to energization, and to make the disengagement torque value of the electromagnetic race clutch 10 a stable torque value.

Next, a case where the electromagnetic tooth clutch 10 with the control device is used as a driven device 1ffi 25 in a folding machine of a printing device for newspapers or the like will be described with reference to FIG.

In this folding machine, a printed roll paper 25 is sent out in a continuous state through a drying process, and is folded in two between a folding roller 28 while being straightened by a former 27, and then folded into two on a cutting side 29. At the same time, each folding cylinder 30
, 31, fold this in half again and send it out L50-L32
It is designed so that it is sent to the next process. In particular, in order to keep the tension of each folding cylinder 3° 31 constant and protect each expensive folding cylinder 30, 31 from accidents caused by paper cuts or paper jams, the drive shaft of the rotating shaft motor 19 of each folding cylinder 30, 31 is A tooth clutch 10 is used to connect the two. In this case, for example, the rotating shaft of the motor 1-9 is attached to the tooth ring 7 side of the electromagnetic tooth clutch 10, and the rotating shaft of each folding cylinder 30, 31 is connected to the tooth ring G side of the electromagnetic tooth clutch 1o via a coupling or the like. Connect in such a way that the shaft is attached.

In use 17, first, the start switch SWO of the switching control circuit 16 is operated (7, the electromagnetic tooth clutch 10 is brought into the connected state by the start signal P1).

Next, the switching control circuit 16 is operated by intermittently operating the switching switch SW1. In this case, the motor 19 is intermittently driven via the inverter circuit 18 by the operation of the inching switch SW1, and at the same time, the applied current Id created based on the inching signal S1 output by the selection of the set value selection circuit 15 is The excitation coil 4 of the electromagnetic tooth clutch 10 is energized to set the disengagement torque T1 during inching. Therefore, if the load torque exceeds the release torque T1 due to an abnormality such as a paper jam, the electromagnetic tooth clutch 1
0 operates to disengage and stop transmission, and each folding cylinder 30, 3
1 is protected.

If there is no abnormality in the above inching, then the acceleration switch is operated to accelerate the motor 19 and set the disengagement torque T2 during acceleration based on the acceleration signal S2 for the electromagnetic tooth clutch 10. When the accelerated motor 19 reaches a predetermined rotation speed, a confirmation signal SO fed back from the inverter circuit 18 to the switching control circuit 16 sends a steady operation signal S to the set value selection circuit 15.
A command signal is issued to select T4, and based on this, the tooth clutch 10 is switched to the disengaging torque T4 during steady operation.

Furthermore, if you want to stop the motor] 9 while decelerating it from a normal operating condition, or if you want to stop it suddenly due to an abnormality, operate the deceleration switch SW3 or the sudden stop switch SW5 to decelerate or stop the motor 19 in the same manner as described above. At the same time as causing the electromagnetic tooth clutch 10 to perform a sudden stop operation, the disengagement torque T3 or disengagement torque T is applied to the electromagnetic tooth clutch 10 based on the deceleration signal S3 or the sudden stop signal S5.
5 settings are made.

Therefore, unlike the conventional case, it is possible to set the disengaging torque for the electromagnetic tooth clutch 10 in accordance with various operating conditions of the motor 9, and this setting operation does not stop the driven device 25. This can improve work efficiency.

It should be noted that the present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the gist.

For example, in the case of a rotary drive device, it is also possible to apply the present invention to an engine or the like in addition to the motor. Moreover, the switching operation by the operation switch in the above embodiment is programmed in advance and stored in the switching control circuit as a sequencer, so that the switching operation is automatically performed. may be simplified.

〔Effect of the invention〕

As is clear from the embodiments described above, in the present invention, the electromagnetic tooth clutch itself functions as a torque limiter, so there is no need for a torque limiter, which was conventionally provided separately from the electromagnetic tooth clutch, which simplifies the device and improves reliability. You can measure your improvement.

In addition, the problems associated with conventionally used mechanical torque limiters, such as their operation becoming unstable due to precision and long-term use, and complicated maintenance and inspection work, are solved. In the electromagnetic tooth clutch of the present invention in which the disengagement torque is set by controlling the current, the magnetic force weakens in proportion to the square of the distance between the magnetic poles of the teeth, so disengagement is easy and highly reliable operation can be obtained.

In particular, it is possible to adjust the disengagement torque by automatically selecting the appropriate setting value from among multiple setting values that can be set arbitrarily, so the drive state of the rotary drive device such as a motor can be changed or connected. In addition, it is possible to easily cope with changes in the load conditions of the driven device, and to make adjustments during operation without stopping the operation of the rotary drive device and the driven device.

[Brief explanation of drawings]

Fig. 1 is an overall block diagram of the electromagnetic tooth clutch control device according to the present invention, Fig. 2 is a waveform diagram of the main parts of the device, and Fig. 3 is a part showing the configuration and operation of the electromagnetic tooth clutch portion of the device. FIG. 4 is a side view showing an enlarged main part of the electromagnetic tooth clutch, and FIG. 5 is an explanatory diagram of a printing press in which the electromagnetic tooth clutch control device according to the present invention is used. be. [Explanation of symbols] 1... Rotor 2... Ball bearing 3... Stator 4... Excitation coil 5 Armature 6, 7 Tooth ring 6A7A...
Teeth 8 - Adapter plate 9 - Leaf spring 10 - Electromagnetic tooth clutch 1 - Flange 12 - Sensor 13 - Mounted on plate 14 Setting circuit 1-5 - Setting selection circuit 16 - Switching control circuit 17 - Comparison circuit
18・-Inno 1-Tater circuit 19・Motor 2
0... Control panel 22, armature core position detection circuit 23, pulse generation circuit 24, drive circuit 25, driven device (q) (b) Fig. 4

Claims (1)

[Claims] An electromagnetic tooth-scratch is interposed between a rotary drive device and a driven device, the driven device is driven in conjunction with the rotary drive device, and the current applied to the excitation coil of the electromagnetic tooth-scratch is A control device configured to perform control to engage and disengage a clutch at a desired disengagement torque, the control device comprising: a setting circuit capable of setting a plurality of currents applied to the excitation coil; and selecting a desired setting value from this setting circuit. and a switching control circuit that instructs the rotary drive device to perform a desired rotational drive and instructs the set value selection circuit to select a set value that is compatible with the driving state of the rotary drive device. An electromagnetic two-scratch control device that is characterized by: