JPH0881858A - Safety device for cloth fell area of loom - Google Patents

Abstract

PURPOSE: To prevent the rate of operation of a loom from deteriorating by avoiding an unnecessary stop of the loom due to the entry of fly wastes, etc., into a cloth fell area in the loom of the type of sensing the entry of foreign materials into the cloth fell area with an optical type safety sensor and outputting an operation stop signal. CONSTITUTION: This safety device for a cloth fell area is obtained by interposing a timer T1 between a sensing circuit 1 for entry of foreign materials capable of sensing the entry of the foreign materials into the cloth fell area 5 with a safety sensor and outputting a signal S1 for the entry of the foreign materials and a control circuit 3 capable of receiving the signal S1 for the entry of the foreign material from the sensing circuit 1 and outputting an operation stop signal S2 for the loom and increasing the set delay time thereof from the upper limit of a light shielding time with fly wastes, etc. Even if the fly wastes, etc., enter the cloth fell area 5 when the operation signal is ON, the light shielding time thereof is shorter than the set delay time of the timer T1. Thereby, although the signal S1 for the entry of the foreign materials is temporarily generated from the sensing circuit 1, the signal does not continue. The operation stop signal S2 is not outputted from the control circuit 3 corresponding to the signal S1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cloth fell area safety device for a loom, and more particularly to a loom of a type that detects an intrusion of a foreign substance into the cloth fell area by an optical safety sensor and outputs an operation stop signal. The improvement of the detection function in.

[0002] In this specification, the "body and the like" are all things such as the body of an operator which should be the object of detection of invasion to the cloth fell area, and the safety sensor has a relatively long light-shielding time. Refers to something. In addition, with "such as cotton wool",
All things that should not be detected as invasion into the cloth fell area, such as floating cotton wool, and those that have a relatively short light-shielding time although the safety sensor blocks light. In addition, "the operation signal is ON" is not limited to a state in which the loom is normally operating, but may be an automatic repair device (APR).
It also includes a state in which the vehicle is in an operating state.

[0003]

2. Description of the Related Art In a loom, in order to prevent an accident such as an injury caused by an operator being inadvertently pinching his / her finger between the temple or the temple cutter and the reed during normal operation or inching operation. It is common practice to place optical safety sensors in the cloth fell area. That is, when a foreign substance such as a body enters the cloth fell area and the safety sensor is shielded from light, a loom operation stop signal is generated by detecting this.
A system for automatically stopping the loom has already been proposed and put into practical use.

[0004]

By the way, the foreign substances that enter the cloth fell area are not limited to the body, and inevitably fly dust or the like that floats around the loom also enters the cloth fell area. Naturally, the cotton wool or the like that has entered the cloth fell area also shields the safety sensor, and in response to this, the safety device outputs an operation stop signal, and as a result, the loom stops. However, it is not the body or the like that actually invades the cloth fell area, but the floss or the like, so in this case, it is not necessary to stop the loom. However, if the loom is forced to stop, the operating rate of the loom will decrease.

The present invention relates to a loom of a type in which an optical safety sensor detects an intrusion of a foreign matter into the cloth fell area and outputs an operation stop signal, in which the loom is unnecessarily stopped due to invasion of cotton wool into the cloth fell area. It is an object of the present invention to avoid the above and prevent the loom operating rate from decreasing.

[0006]

A foreign matter intrusion detection circuit that detects a foreign matter intrusion into a cloth fell area by a safety sensor and outputs a foreign matter intrusion signal, and a loom stop signal in response to the foreign matter intrusion signal from the detection circuit The gist is that a timer is provided between the control circuit for outputting and the set delay time is longer than the upper limit of the light blocking time due to the cotton wool or the like.

[0007]

When the operation signal is on, even if cotton dust or the like enters the cloth fell area, the light shielding time is shorter than the delay time set by the timer. Therefore, although the foreign matter intrusion signal is temporarily generated from the detection circuit, it does not continue, and the control circuit does not output the operation stop signal in response to this.

If the body or the like invades the cloth fell area when the operation signal is on, the light shielding time is longer than the delay time set by the timer. Therefore, the foreign matter intrusion signal output from the detection circuit continues, and in response thereto, the operation stop signal is output from the control circuit.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example of a safety device according to the present invention. When the operation switch SW is operated, it outputs an operation signal in a known operation circuit to start the operation of the loom. The foreign matter intrusion detection circuit 1 is configured to include a safety sensor that generates detection light across the cloth fell area 5 and a relay R2. The foreign matter intrusion detection circuit 1 outputs a foreign matter intrusion signal S1 when the safety sensor is shielded from light, and the relay R2 operates.

The operation switch SW is a contact C3 of the relay R3.
-1 constitutes a self-holding circuit.

The timer T1 is an off-delay timer in the illustrated example, and closes the contact CT1 connected to the control circuit 3 after a lapse of a set delay time from when the timer is turned off. The control circuit 3 outputs the operation stop signal S when the contact CT1 is closed.
2 is output. The delay time of the timer T1 is set to be larger than the upper limit of the light blocking time due to cotton wool or the like. For example, when the light-shielding time due to cotton wool is in the range of 2 to 4 sec, the set delay time of the timer T1 is set to be larger than 4 sec. The control circuit 3 outputs the operation stop signal S2 when the contact CT1 is closed.

The contact C1 of the relay R1 is a normally closed contact,
The contact C2 of the relay R2 is a normally open contact, and the contacts C3-1 and C3-2 of the relay R3 are normally open contacts.

The timer T1 is not limited to the off-delay timer, but an on-delay timer may be used.
In that case, the ON / OFF switching relationship between each relay and the contact is appropriately changed.

An example of the operation of the safety device according to the present invention will be described with reference to FIGS. In the state shown in FIG. 1, the operation switch SW is not yet operated and the operation signal is off. Therefore, the relays R1 to R3 are all off,
Contact C1 is closed and contacts C2, C3-1, C3-2
Are all open. Since the contact C1 is closed, the timer T1 is on and therefore the contact CT1 is open. Of course, neither the foreign matter intrusion signal S1 nor the operation stop signal S2 has been output yet.

FIG. 2 shows a state in which the loom has started to operate normally and continues to operate. In the state shown in this figure, when the operation switch SW is operated, the relay R3 is turned on and the contacts C3-1 and C3-2 are closed. As a result, even if the self-holding circuit operates and the operation of the operation switch SW is released (that is, the operation switch SW is opened), the operation signal remains ON and the loom continues to operate. That is, the present invention can be operated, the relay R2 remains off, and the contact C2 remains open. Therefore, relay R1 remains off and contact C
1 also remains closed and timer T1 does not run in this state.

FIG. 3 shows the state when foreign matter has entered the cloth fell area 5. In the figure, the one-dot chain line shows a large hand shape in the form of a body, and the small circle represents a cotton swab. In any case, since the safety sensor is shielded from light, the detection circuit 1 outputs the foreign matter intrusion signal S1. As a result, the relay R2 is turned on and the contact C2 is closed. Then, at this time, since the loom is already in operation, the contact C3-1 is already closed, the relay R1 is turned on, the contact C1 is opened, and the timer T1 starts counting. However, since the set delay time has not yet been reached at this point, the contact CT1 is not closed. That is, the operation stop signal S2 is not yet output from the control circuit 3.

FIG. 4 shows a state in which foreign matter such as cotton wool has left the cloth fell area 5. Since the fly cotton leaves the cloth fell area 5 within the set delay time of the timer T1 from the time when the cloth fell into the cloth fell area 5, the safety sensor is not shielded from light at this time. The foreign matter intrusion signal S1 is no longer output. Therefore, the relay R2 is turned off, the contact C2 is opened, the relay R1 is turned off, and the contact C1 once opened in the state of FIG. 3 is closed. As a result, the timer T1 is turned on to stop counting and reset. Therefore, the contact CT1 remains open, and the control circuit 3 does not output the operation stop signal S2.

That is, in the case of fly cotton or the like, the cloth fell area 5
Since the detector circuit 1 once outputs the foreign matter intrusion signal S1 even if it intrudes into, the output state is canceled within the delay time set by the timer T1. Therefore, even if the foreign matter has entered the cloth fell area 5, the control circuit 3 does not output the operation stop signal S2, and the loom continues to operate.

FIG. 5 shows a state in which a foreign body such as a body remains in the cloth fell area 5 for a time longer than the set delay time of the timer T1 from the start of entering the cloth fell area 5. As shown in the figure, even at this time, the body and the like remain in the cloth fell area 5, and the safety sensor continues to shield the light,
The detection circuit 1 continues to output the foreign matter intrusion signal S1. Therefore, relay R2 remains on and contact C2 remains closed. Therefore, the relay R1 remains on,
In the state of FIG. 3, the contact C1 that has been opened once is still open. As a result, the timer T1 remains off and continues counting from the time the foreign matter intrusion signal S1 is output, and counts up after the set delay time elapses, and the contact CT1 is closed, so that the control circuit 3 outputs the operation stop signal S2.

That is, in the case of the body, the cloth fell area 5
The detection circuit 1 continues to output the foreign matter intrusion signal S1 and remains there for the set delay time or longer, and the output state is not canceled within the set delay time of the timer T1. Therefore, the timer T1 closes the contact CT1 and the control circuit 3
Outputs an operation stop signal S2 to a known circuit, and the loom is stopped to prevent danger.

[0021]

[Effects of the Invention] Even if cotton wool or the like enters the cloth fell area, the operation stop signal is not output from the control circuit due to the short light-shielding time, and the loom continues to operate. Therefore, the operating rate of the loom does not decrease due to unnecessary stoppage. However, when the body or the like intrudes, the operation stop signal is output from the control circuit and the loom stops operating due to the large light-shielding time. Therefore, the original function of the cloth fell area safety device is not impaired.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a state of the device of the present invention when a driving signal is off.

FIG. 2 is a circuit diagram showing a state of the device of the present invention when a driving signal is turned on.

FIG. 3 is a circuit diagram showing the state of the device of the present invention when a foreign matter enters the cloth fell area.

FIG. 4 is a circuit diagram showing a state of the device of the present invention when the fly is separated from the cloth fell area within a set delay time when the foreign matter is the fly etc.

FIG. 5 is a circuit diagram showing a state of the device of the present invention after a lapse of a set delay time or more when a foreign substance is a body or the like.

[Explanation of symbols]

 1 foreign matter intrusion detection circuit 3 loom operation control circuit 5 weaving area S1 foreign matter intrusion signal S2 operation stop signal

Claims (1)

[Claims] 1. A foreign matter intrusion detection circuit which detects a foreign matter intrusion into a cloth fell area by a safety sensor and outputs a foreign matter intrusion signal, and a foreign matter intrusion signal output from the detection circuit to output a loom operation stop signal. A cloth fell area safety device for a loom, comprising a control circuit and a timer interposed between the control circuit and the set delay time thereof being larger than an upper limit of a light blocking time due to a cotton fly or the like.