JPH04324598A - Abnormality annunciator - Google Patents

Abstract

PURPOSE:To easily confirm abnormal equipment through senses of sight and hearing by warning the abnormality of equipment by changing the flashing cycle of an indicator lamp and/or ringing-and-stopping cycle of an alarm. CONSTITUTION:A switching circuit 9 which is constituted to input an error signal generated from a screw feeding machine 2 and another error signal B from a screw tightening machine 4 when abnormality occurs and switches a capacitor for deciding the time constant of the cycle generation circuit of a control circuit in accordance with the generating source of the signal A or B when the signal A or B is inputted is provided. This abnormality annunciator 8 which alarms the abnormality of a screw tightening device 1 is constituted of the control circuit 5, indicator lamp 6, alarm 7, and the circuit 9. In addition, the abnormality annunciator 8 informs the source of abnormality, whether the screw feeding machine 2 or screw tightening machine 4, by changing the flashing cycle of the lamp 6 and/or ringing-and-stopping cycle of the alarm 7 in accordance with the cycle of an alternating signal.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abnormality alarm device that warns of the occurrence of an abnormality in a device such as a screw tightening device.

0002

2. Description of the Related Art FIG. 5 is a system diagram of a conventional abnormality notification device and screw tightening device. In FIG. 5, reference numeral 1 denotes a screw tightening device for automatically tightening screws on a workpiece, and is composed of a screw feeder 2, a screw tightening robot 3, and a screw tightening machine 4.

Reference numeral 5 denotes a control circuit that drives an indicator lamp 6 and an alarm 7 based on signal outputs from the screw feeder 2 and the screw tightener 4 in the event of an abnormality. Reference numeral 8 denotes an abnormality alarm device for notifying an abnormality in the screw tightening device 1, which includes an indicator lamp 6 and an alarm 7.
and a control circuit 5.

Next, the operation of the conventional device will be explained. The screw tightening robot 3 controls the screw feeder 2 and the screw tightening machine 4 by a built-in control circuit, receives the screw from the screw feeder 2, positions it at a predetermined position on the workpiece, and tightens the screw with the screw tightening machine 4. I do.

The screw feeder 2 outputs an error signal A when an abnormality occurs in screw feeding. Further, the screw tightening machine 4 outputs an error signal B when an abnormality occurs in screw tightening. on the other hand,
The abnormality notification device 8 inputs the error signal A and/or B to the control circuit 5 and drives the display lamp 6 and the alarm 7.

[0006] When the abnormality alarm device 8 operates to drive the display lamp 6 and alarm 7, it causes the display lamp 6 and alarm 7 to blink and stop ringing or to turn on and ring at a predetermined period.

[0007]

[Problems to be Solved by the Invention] Since the conventional abnormality notification device is configured as described above, it is possible to detect when an abnormality in screw supply or screw tightening occurs, or when both screw supply and screw tightening occur. When an abnormality occurs, the control circuit 5 only has the function of turning on and off the display lamp 6 and alarm 7 at a predetermined cycle, or lighting and sounding, so it is likely that there is an abnormality in the screw feeder 2 or the screw tightening machine 4. It is not easy to know whether the problem is abnormal or both, and if it is used on an assembly line, it takes time to find out which device in the screw tightening device 1 is abnormal, which worsens productivity. There were issues such as how to

[0008] This invention was made in order to solve the above-mentioned problem, and it is possible to detect which equipment is abnormal by changing the flashing cycle and/or ringing cycle of the alarm when an abnormality occurs in the equipment. The purpose is to obtain a notification device.

[0009]

[Means for Solving the Problems] The abnormality notification device of the present invention includes an alternating signal generating means that generates an alternating signal whose period is changed depending on the type of error signal input when an equipment abnormality occurs;
In response to this alternating signal, a notification means is provided to notify which equipment is abnormal by blinking and/or ringing and stopping.

0010

[Operation] In the abnormality notification device according to the present invention, since the notification means changes the blinking period and/or the ringing/stopping period according to the period of the alternating signal, it is possible to notify which equipment is abnormal.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a system diagram of an abnormality notification device according to an embodiment of the present invention, and reference numerals 1 to 8 indicate the same or equivalent parts as those of the conventional device, and the explanation thereof will be omitted.

In FIG. 1, reference numeral 9 indicates the screw feeder 2 in the event of an abnormality.
The capacitor for determining the time constant of the period generating circuit of the control circuit 5 is configured to input the error signal A generated from the screw tightening machine 4 and the error signal B generated from the screw tightening machine 4. This is a switching circuit that switches between

An abnormality alarm device 8 that warns of abnormalities in the screw tightening device 1 is composed of a control circuit 5, an indicator lamp 6, an alarm device 7, and a switching circuit 9.

FIG. 2 is a detailed circuit diagram of the switching circuit 9 and control circuit 5. In Figure 2, Q1 is a switching transistor whose emitter is grounded, and the base side is a series-connected bias resistor R connected between the power supply and ground.
1 and R2 and the input terminal of the error signal B, and its collector is connected to one end of the time constant determining capacitor C1. The switching transistor Q2, the bias resistors R3 and R4, and the time constant determining capacitor C2 are constructed in the same manner as described above, but the switching transistor Q2 is adapted to input the error signal A to its base. The other ends of the time constant determining capacitors C1 and C2 are connected to each other and connected to the output terminal of the switching circuit 9.

The period generating circuit is composed of a multivibrator consisting of resistors R5 to R8, capacitors C3 and C4, and transistors Q3 and Q4. The base of the transistor Q3 is connected to the output terminal of the switching circuit 9, and the other end of a capacitor C3 whose one end is grounded.

The resistors R9 and R10 and the transistor Q5 are configured to invert and amplify the output of the period generating circuit, and are a drive circuit that drives the display lamp 6 and the alarm 7 with the output. The switching circuit 9 and the control circuit 5 constitute an example of an alternating signal generating means, and the display 6 and the alarm 7 constitute an example of a notification means.

Next, the operation will be explained with reference to FIGS. 1 and 2. Under normal conditions, error signals A and B are not generated, so both switching transistors Q1 and Q2 are turned on by the action of bias resistors R1 to R4, and the period of the period generating circuit is determined by the resistance value of resistor R6 and capacitor C3. ，
It depends on the combined capacity of C1 and C2.

For example, when an error occurs in the screw supply and the error signal A is output from the screw feeder 2, the switching transistor Q2 is turned off and the capacitor C2 is released from the ground, so that the output of the period generating circuit is The period of (collector voltage of transistor Q4) depends on the resistance value of resistor R6 and the combined capacitance of capacitors C3 and C1.

Here, transistors Q3, Q4, resistor R
A period generating circuit consisting of capacitors C1, C3, and C4 is oscillating. At this time, O of transistor Q3
At the time of FF, Q4 is ON and the output of the period generating circuit is at "L" level, and the period is determined by the resistance value of resistor R6 and the combined capacitance of capacitors C1 and C3. When the transistor Q3 is turned on, the output of the period generating circuit is the "H" level, and the period is determined by the resistance value of the resistor R5 and the capacitance of the capacitor C4.

As a result, the output of the period generating circuit is as shown in FIG.
The signal waveform has a period T1 shown in (a), and the period T1
is longer than in other abnormal situations described below.

When an abnormality occurs in screw tightening from normal operation and error signal B is output from the screw tightening machine 4, the switching transistor Q1 turns OFF and the capacitor C1
is released from the ground, so the period of the period generating circuit depends on the resistance value of resistor R6 and the combined capacitance of capacitors C3 and C2. However, since the capacitance of capacitor C2 is smaller than that of capacitor C1, Its period T2 shown in (b)
is shorter than the period T1.

Furthermore, when an abnormality occurs in both screw supply and screw tightening, the switching transistors Q1 and Q2 are turned off, and the period of the output of the period generating circuit depends on the resistance value of the resistor R6 and the capacitance of the capacitor C3. , Figure 3(c
) is the shortest period T3.

As described above, the period of the period generating circuit can be changed according to the occurrence of each abnormality, and the output of the drive circuit consisting of the transistor Q5 and the resistors R9 and R10 (signal waveform that is an inversion of the signal waveform in FIG. 3) ) can change the blinking cycle of the display lamp 6 and the ringing/stopping cycle of the alarm device 7.

In the case of this embodiment, the period during which the indicator lamp 6 and the alarm 7 repeatedly light up and sound is constant when the output of the period generator circuit is at "H" level, and the period during which they do not light up or sound is different. .

Furthermore, in the above embodiment, the period generating circuit of the control circuit 5 uses a multivibrator, but the period generating circuit is a blocking oscillation circuit whose period is determined by the time constant of a resistor and a capacitor. The same effect as in the above embodiment can be expected.

Even if the period of the lighting time of the indicator lamp 6 and the period of the sounding time of the alarm device 7 are changed, the same effect as in the above embodiment can be expected; in this case, the output terminal of the switching circuit 9 is connected to the capacitor C4 side of the period generating circuit. All you have to do is connect the . The output waveform of the period generating circuit in this case is shown in Figure 4, and Figure 4(a)
4B shows the case of an abnormality in screw supply, FIG. 4B shows the case of an abnormality in screw tightening, and FIG. 4C shows the case of an abnormality in screw supply and screw tightening.

In each of the embodiments described above, the indicator lamp 6 and the alarm 7 are turned on and sound when the period generating circuit is at the "H" level, but they may be turned on and sound when the period generation circuit is at the "L" level.

Furthermore, even if there are not two error signals,
Even if there are three or more, the same configuration can be achieved, and the same effects as in each of the above embodiments can be achieved. Furthermore, if either the indicator lamp 6 or the alarm 7 is present, an abnormality can be notified.

Furthermore, even if the control circuit is configured to input an error signal as in the conventional case, the same effects as in the above embodiment can be obtained.

[0030]

As described above, according to the present invention, a device is configured to be alarmed by a difference in blinking period and/or ringing/stopping period, so that it is possible to visually and/or aurally identify which device is abnormal. It is easy to know, problems can be resolved quickly, and when used on assembly lines, productivity can be minimized and productivity can be improved.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an abnormality notification device according to an embodiment of the present invention.

FIG. 2 is a specific circuit diagram of a switching circuit and a control circuit in FIG. 1;

FIG. 3 is a signal waveform diagram of the period generating circuit when the device is abnormal.

FIG. 4 is a signal waveform diagram of a period generating circuit when a device is abnormal according to another embodiment.

FIG. 5 is a configuration diagram of a conventional device.

[Explanation of symbols]

5 Control circuit 6 Indication lamp 7 Alarm device 8. Abnormality alarm device 9 Switching circuit

Claims (1)

[Claims] Claim 1: An alternating signal generating means for generating an alternating signal whose cycle is changed depending on which device the error signal is inputted from among the devices that generate the error signal at the time of an abnormality; An abnormality notification device characterized by comprising a notification means for notifying an abnormality of the device by blinking and/or ringing.