JPH03143493A - Washing machine such as dry-cleaner - Google Patents

Abstract

PURPOSE:To enable the rotation/stop of a handling drum to be exactly detected by setting the rotation/stp detector of the handling drum consisting of a sensor for detecting the rotation of the handling drum, a differentiating circuit for differentiating processing signal from the sensor, and a one-shot multivibrator for generating output based on signal from the differentiating circuit. CONSTITUTION:The rotation/stop of a handling drum is detected at three positions. Before the previous washing process comes to an end and deliquefying process starts, a main motor 7 is driven at a washing rotational-speed by a variable speed motor controller 14 via an interface 12 from a CUP 13. When the deliquefying starts, then the motor is driven at a deliquefying rotational speed by the variable speed motor controller 14 via the interface 12 from the CPU 13. In this state, by the control of the CPU 13, the deliquefying is performed for a specified time. During the washing, also during the deliquefying, the reinforcing rib 5a of a handling drum side V-pulley 5 is detected by a sensor 9, and the output of pulse is generated, and via a differentiating circuit 10, the output of a one-shot multivibrator 11 is monitored by the CPU 13, and so the stop of the handling drum 4 can be detected.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a washing machine, such as a dry cleaner or a water washer/dehydrator, which is equipped with a device for detecting rotation stoppage of a processing drum.

(Prior art) When washing with a washing machine such as a dry cleaner or a washing machine, a processing drum is rotated at high speed during one cycle of washing to centrifugally separate the solvent and moisture in the clothes. , called the deliquification process).

On the other hand, in recent years, as clothing has become more diverse, an inverter motor is used in the drive system of the processing drum, and the washing rotation speed
Increasingly, there are cases where the rotational speed for dewatering can be freely selected.

Such inverter-equipped dry cleaners and water dehydrators are controlled so that after the dewatering process, they quickly decelerate and stop from high speed rotation in order to move on to the next process, in order to shorten the process time as much as possible. Ru.

For example, as a stopping method, you can either equip the inverter control circuit with a discharge resistor and use regenerative braking to stop it, or turn off the impark control system and let the motor free run, and then use a mechanical brake to stop it. This method has been adopted. In any case, as long as an inverter is used, the motor must be completely stopped due to the characteristics of the inverter as a condition for decelerating from high speed rotation to the next process of cleaning rotation.

Conventionally, the method of detecting whether the motor has completely stopped is to measure the time it takes for the processing drum to stop.
This data was stored in the control device of the dry cleaner or water washer/dehydrator, and based on the stored data, control was performed to a certain extent to give a sense of abandonment.

(Problem to be Solved by the Invention) As described above, in the conventional technology, control was performed in which the rotation of the processing drum was stopped by time control based on actual measurement data, and the process was moved to the next step at a final stage. However, with this control method, if there is a malfunction in the discharge resistor during regenerative braking, such as burnout or disconnection of the resistor, or if there is a mechanical failure in mechanical brakes, a fixed period of time will be applied in either case. The processing drum did not stop during the process, and after a predetermined period of time had passed while still rotating, it automatically moved to the next process, which could lead to damage to the inverter body. In addition, even in the event of a momentary power outage, the inverter motor will be in a free-running state, and even with regenerative braking,
Even with a mechanical brake system, control becomes impossible, and in this case, the only option is to wait for the processing drum to stop naturally and then restart the machine. If the inverter motor is restarted while it is free-running, there is a risk of damage to the inverter itself, so the operator must confirm that the processing drum has completely stopped before pressing the start button. be.

As described above, the conventional techniques have disadvantages in terms of control and operation, and it has been desired to realize a reliable and inexpensive processing drum rotation stop detection device.

The present invention was developed in response to the above needs, and is a dryer equipped with a device that accurately detects the stoppage of rotation of the processing drum regardless of whether it is driven by an inverter or not, and transmits this to the control device of the main body of the machine. The purpose is to provide a washing machine such as a cleaner.

(Means for Solving the Problems) For this reason, the present invention provides variable distance control as a processing drum drive motor. In washing machines such as dry cleaners that use a motor with a 711 device and have a control device that controls each part of the machine, there is a sensor that detects the rotation of the processing drum, a differential circuit that differentially processes the signal from the sensor, and a differential circuit that processes the signal from the sensor. The present invention is configured to include a processing drum rotation stop detection device consisting of a one-shot multi-pipe rake that outputs an output based on a signal from a circuit, and serves as a means for solving the above problem.

This can be described specifically as follows.

(Near the reinforcing rib of the drive pulley of the processing drum 11,
For example, by attaching a proximity switch and rotating a drive pulley, the proximity switch outputs pulses equal to the number of reinforcing ribs.

(2) The pulse output from the proximity switch is connected to an electronic circuit, and the rising edge is used as a trigger signal to activate a one-shot multi-by-break.

(3) If pulses are continuously input from the proximity switch within the operating time of the one-shot multi-pipe rake, the output of the one-shot multi-vibrator continues.

(4) Therefore, the operation time of the one-shot multi-by-break is set to a time slightly longer than the pulse interval of the proximity switch when the rotation of the processing drum is decelerated and immediately before it stops.

(5) In this way, the state in which the output of the one-shot multi-pipe rake is turned off becomes the stopped state of the processing drum.

(Function) (1) One-shot multivibrator output is OFF
Since this state is the stopped state of the processing drum, if you connect the output of the one-shot multi-by-break to the control device of a dry cleaner or water washer/extractor and move to the next process depending on that state, for example, Even if there is a problem with the discharge resistor or mechanical brake, the process will not proceed to the next process until the one-shot multi-by-break output is turned off.

(2) Even if the inverter motor is free-running due to a momentary power outage, there is no need to worry about damaging the inverter if restarting is not performed until the output of the one-shot multi-high break is turned off.

(3) Since the one-shot multi-high break is triggered by the rising edge of the proximity swing output, it will not malfunction even if the reinforcing rib of the processing drum drive pulley stops exactly at the proximity swing position.

(Example) Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments.

All the figures relate to the present invention, and FIG. 1 shows a schematic diagram of a dry cleaner for explaining one embodiment of the present invention, in which clothes and the like are cleaned using an organic solvent such as perchlorethylene.

Figure 2 is a configuration diagram of the drive system of the same dry cleaner, Figure 3 is an external view of the drive system shown in Figure 2, and Figure 4 is an example of a process chart showing the 1 cycle from cleaning to drying of the dry cleaner. show. FIG. 5 is a control block diagram of the drum rotation/stop detection device which is the main component of the present invention, and FIG. 6 is an operation time chart thereof.

In FIG. 1, when the clothes 2 are put into the processing drum 4 through the door 1 and the door 1 is closed to start operation, the process ΦL is generally carried out in the steps shown in FIG. 3 is a processing tank in which a processing drum 4 rotates. Garment 2 in processing drum 4
is cleaned by a container (pumped from a solvent tank).

In FIGS. 2 and 3, 4 is a processing tram, 5 is a drum-side V pulley directly connected to the processing drum, and the V pulley 5 has a plurality of reinforcing ribs 5 extending from its outer circumference toward the center axis
A is provided.

Reference numeral 6 indicates a motor-side V-pulley that is directly connected to the shaft of a variable-speed controlled motor (main motor) 7 having a variable-speed motor control device 14 such as an inverter, and 8 a motor-side V-pulley connected to the drum-side V-pulley 5 and the motor-side V-pulley 6. The passed V-belt 9 is attached to a fixed part of the machine close to the reinforcing rib 5a of the V-boo U5 on the drum side, and is turned on and off each time the reinforcing rib 5a passes by the rotation of the V-boo IJ5. This sensor consists of a proximity switch or photoelectric switch that generates pulses.

In FIG. 5, numeral 10 is a differentiation circuit that differentiates the ON-OFF pulse output from the sensor 9, such as a proximity switch or a photoelectric switch, to create a rising edge and a falling edge. Reference numeral 11 denotes a one-shot multi-high break that generates an output for a predetermined time using the rising edge output from the differentiating circuit 10 as a trigger signal. This determined time can be freely changed by changing the constants of the resistor and capacitor (none of which are shown) in the one-shot multi-high break 11. Also, since the one-shot multi-high break 11 generates an output for a predetermined time each time a trigger signal (rising edge) is applied, for example, if the trigger signal is continuously applied for a shorter time than the predetermined time, the one-shot multi-high break high break 1
The output of 1 generates an output for a predetermined time after the last trigger signal is applied, and generates a continuous output waveform for the entire time until it is turned off.

12 receives a signal from the one-shot multivibrator 11, sends a signal to the variable speed motor control device 14,
This is an interface for exchanging signals with the CPU 13, which plays a central role in controlling the tri-cleaner.

Next, its effect will be described.

When the clothes 2 are introduced through the door l of the treatment tank 3 of the dry cleaner and the operation is started, the operation is generally performed according to the steps shown in FIG. There are three locations.

Now, if we look at the stage where cleaning in the pre-washing process is finished and the process moves to deliquification, up until then the main motor 7 has been driven by the variable speed motor control device 14 from the CPU 13 via the interface 12 at the cleaning rotational speed. When entering the liquid, the CPU 13 to the interface 1
2 at the dewatering rotational speed by a variable speed motor controller 14. In this state, the liquid is removed for a predetermined period of time under the control of the CPU 13. During cleaning and dewatering, the sensor 9 detects the reinforcing lip 5a of the V-pulley 5 on the drum side, and as shown in FIG. 6, the pulse interval output from the sensor 9 is short, and the one-shot multi-by-break The output of No. 11 continues to be in the ON state.

Once dehydration is complete, the next step is deceleration. The command is transmitted from the CPU 13 to the variable speed motor control device 14 via the interface 12, and the main motor 7 enters deceleration control.

When deceleration control is started, the pulse interval output from the sensor 9 gradually becomes longer, and by the time the main motor 7 stops, the reinforcing rib 5a of the drum-side V-pulley 5 has passed the sensor 9 position. Either the reinforcing rib 5a stops exactly at the position of the sensor 9 and the sensor output remains in the ON state. Even in the latter state, since the one-shot multi-by-break 11 is triggered via the differentiating circuit 10, signal processing can be performed in the same way as in the former state.

When the main motor 7 stops after deceleration, the sensor 9
Since the pulse from 1 is no longer input to the one-shot multi-by break 11 via the differentiating circuit 10, the output of the one-shot multi-by break 11 is turned off T seconds after the last trigger is applied.

The CPU 13 monitors this state via the interface 12, and the one-shot multi-by-break 11
When the output is turned off, it is assumed that the processing drum 4 has stopped, and the dry cleaner advances to the next process, that is, the water washing process.

Thereafter, the process proceeds to a washing process, a rinsing process, and a drying process in the same manner.

In this way, if the ON time of the one-shot multi-by-break 11 is set to be slightly longer than the pulse interval time from the sensor 9 just before the rotation of the processing drum 4 stops,
Can determine when rotation has stopped.

In addition, if there is a momentary power outage or the like during operation during deliquid rotation, the main motor 7 becomes uncontrollable by the variable speed motor control device 14 and enters a free running state. When the main motor 7 is free running, the processing drum 4
There is no choice but to wait for the brake to stop naturally, but at this time as well, the sensor 9 detects the reinforcing lip 5a of the drum side V-pulley 5 and outputs a pulse, and the one-shot multi-by-break is generated via the differentiating circuit 10. Since the CPU 13 monitors the output of the processing drum 11, it is possible to detect the stoppage of the processing drum 4.

(Effects of the Invention) As described above in detail, the apparatus of the present invention provides the following excellent effects.

(1) Even if the deceleration control circuit or mechanism of a motor with variable speed control such as an inverter breaks down, damage to the variable speed control device can be prevented.

(2) Even if the motor becomes free-running due to a momentary power outage, damage to the variable speed control device can be prevented as long as the motor is not restarted.

(3) When the process is decelerated and stopped after the liquid removal operation to move on to the next process, the judgment is made via the rotation stop detection circuit of the processing drum, allowing for fine-grained and accurate control.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of a dry cleaner according to an embodiment of the present invention, FIG. 2 is a configuration diagram of the drive system of the same dry cleaner, and FIG.
The figure is an external view of the drive system, Figure 4 is a process diagram of the dry cleaner, Figure 5 is a control block diagram of the drum rotation stop detection device, which is the main component of the present invention, and Figure 6 is the operating time of the device. It is a chart. Explanation of the main parts of the diagram 7 - Main motor 9 - Sensor 10 - Differential circuit 11 - One-shot multi-vibrator 14 - Variable speed motor control device Fig. 1 77 Fig. 2 B Fig. 3 j Figure 5

Claims (1)

[Claims] In washing machines such as dry cleaners that use a motor with a variable speed control device as the motor for driving the processing drum and have a control device that controls each part of the machine, a sensor that detects the rotation of the processing drum and a signal from the sensor are installed. A washing machine, such as a dry cleaner, characterized by being equipped with a processing drum rotation stop detection device consisting of a differential circuit that performs differential processing and a one-shot multivibrator that outputs an output based on a signal from the differential circuit.