JPH0632292Y2 - Traction control device for sanding belt in belt sander machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention detects the position of the edge of a sanding belt that runs endlessly and circulates, and drives a steering roller based on the detection signal to perform sanding. The present invention relates to a running trajectory control device for a sanding belt in a belt sander machine in which the traveling trajectory is corrected by moving the belt in the width direction.

Problems to be Solved by the Related Art and Invention Conventionally, as a device of this type, two light emitters are provided on one side of the sanding belt on one side of the sanding belt to sandwich the sanding belt. 2 are spaced apart from each other and receive light from the light emitters on the opposite side 2
Each receiver is connected to a relay controller that sends and stops an operation signal according to whether or not it receives light. Each relay controller is connected to an air cylinder for driving the steering roller. Connect the solenoid switching valve that controls the air supply direction to the relay so that it switches between energized and deenergized so that the relay switches between conduction and non-conduction when there is no operating signal. When the ends move inward toward the center of the belt and the light from both light emitters is received by the light receivers respectively, the relay controller is activated by the actuation signals from both relay controllers, and the electromagnetic switching valve is activated. Excited,
By moving the air cylinder in one direction and tilting the axis of the steering roller in one direction, the sanding belt is moved to the outside, and the movement of the sanding belt to the outside causes the edges of both to emit light. When both light receivers are in the non-light receiving state by blocking the front surface of the, the relay becomes non-conductive and the electromagnetic switching valve becomes non-excited, the air cylinder drives in the opposite direction and the axis line of the steering roller tilts in the opposite direction. It is known that the sanding belt is moved inwardly by this, and the sanding belt is reciprocated within a certain range in the width direction to run on a substantially constant orbit. In the part of the circuit that detects the position of the edge of the deing belt, two light receivers are used corresponding to the light emitters, and the relay controller is connected to each of them. Concrete is complex, moreover, since the light receiver and the relay controller is expensive, cost there has been a costly drawback production.

As a means for solving the above problems, as a means for solving the above problems, the running orbit control device for the sanding belt in the belt sander machine of the present invention is designed so that the end of the endless sanding belt that circulates runs. On one side of the sanding belt, two transmitters that emit signals such as light and ultrasonic waves are arranged at intervals in the width direction of the sanding belt, and on the other side, signals from each transmitter are arranged. One receiver for receiving is arranged so that the first transmitter on the side closer to the center of the sanding belt can always transmit, and the second transmitter on the far side can switch between transmitting and stopping. A relay controller for sending and stopping an actuation signal in response to the presence / absence of reception of the receiver, and the relay controller is provided with a second
Connect a relay that switches the transmission state of the transmitter and the drive direction of the drive mechanism that moves the sanding belt in the width direction by alternately tilting the axis of the steering roller, and based on the reception state of the receiver, the drive mechanism is connected. The driving direction of the sanding belt is switched and the sanding belt is alternately moved in the width direction to correct the traveling path of the sanding belt.

The operation and effect of the present invention With the above configuration, the running track of the circulating sanding belt is shifted to the one side where the edge of the detecting side approaches the center of the belt, and the edge of the ear is the first transmission. When it moves to a position beyond the receiver, the signal from the first transmitter is received by the receiver, whereby an operation signal is output from the relay controller and the relay becomes conductive, and the second transmitter starts transmitting. , The drive mechanism is switched in one direction and the axis of the steering roller tilts in one direction, which causes the sanding belt to gradually move to the other side in the width direction. When the end comes to the position corresponding to the front surface of the first transmitter, the signal from the first transmitter is blocked by the sanding belt and cannot be received by the receiver, but the signal from the second transmitter is transmitted as described above. Because it is received by the receiver ,
While the relay controller keeps outputting the operation signal, the relay is kept in the conducting state, the second oscillator is kept in the transmitting state, and the drive mechanism is kept in the one-way switching drive state. When it moves to the side and the edge of the sanding belt moves to the position in front of the second transmitter, the signal from the second transmitter is also blocked by the sanding belt and is not received by the receiver. The operation signal of the controller stops, the relay becomes non-conductive, the second transmitter stops transmitting, the drive mechanism is switched in the opposite direction, the axis line of the steering roller tilts in the opposite direction, and sanding The belt starts to move to one side in the width direction again, and the edge of the sanding belt separates from the front surface of the second oscillator in the middle of the movement. The receiver does not receive, -The operation signal from the controller remains stopped, the relay is maintained in the non-conductive state, the second oscillator is maintained in the transmission stopped state, and the drive mechanism is maintained in the state of switching drive in the reverse direction. When it moves to one side and the edge of the sanding belt passes over the front of the first transmitter, the first transmitter is always transmitting, so that signal is received by the receiver and the same operation as described above is performed. As a result, the sanding belt moves to the other side, and by repeating these operations, the sanding belt travels on a substantially constant track while repeating the reciprocating motion in the width direction within a certain range.

As described above, according to the present invention, in the circuit for detecting the position of the edge of the sanding belt, the receiver and the relay controller that occupy the expensive parts are provided as one, respectively, and the manufacturing cost is reduced by half compared with the conventional device. It can be greatly reduced, the circuit is simple and the failure rate is reduced.
The entire device can be made compact, and the amount of electricity consumed can be reduced, so that the operating cost can be reduced.

Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a belt sander to which the present invention is applied. A sanding frame 2 installed correspondingly on a material feeding table 1 has a driven roller 3 and a driving roller 4 at the front and rear of its lower end, and an upper end. The steering roller 5, which will be described later in detail, is supported, and an endless sanding belt 6 is provided between them.
The work material a is placed on the material feeding belt 8 and fed in the direction of the arrow, and the sanding belt 6 is applied to the work material a by the treading pad 9 provided between the driving roller 4 and the driven roller 3. The sanding belt 6 is circulated in the direction of the arrow while being pressed to grind the workpiece a. The steering roller 5 is mounted on the upper end of the tension ram 10 in a horizontal plane. The ram 10 is pivotally supported by a steering frame 11 that is freely swingable, and the ram 10 is pneumatically upwardly urged to impart tension to the sanding belt 6, and the rudder As shown in FIG. 2, the lower end of the steering arm 12 hung on the front end of the steering frame 11 has a tip of a piston rod 15 of a steering air silling 14 mounted on the sanding frame 2. Fitted into the fitting groove 16 formed,
As the piston rod 15 moves back and forth, the axis A of the steering roller 5 swings in a certain angle range between A ₁ and A ₂ on the horizontal plane.

In the above-mentioned sanding frame 2, the first light emitter 21 and the second light emitter 22 are arranged at a constant interval in the width direction of the sanding belt 6 so as to correspond to the front edge of the sanding belt 6. And the tip of the two light emitters 2
One that is mounted in a diagonally inward posture that points on the extension line of the intermediate position of 1, 22 and that can receive the beams emitted from both light emitters 21, 22 on the opposite side of sandwiching the sanding belt 6 The light receiver 23 is disposed and attached to the main body frame 24.

Next, the orbit control circuit will be described with reference to FIG. 2. The AC power supply 24 is connected to the first light emitter 21 and the second light emitter 22.
A control unit 25 including a DC power source unit 26 having one end connected to each other and a photoelectric conversion unit 27 that opens and closes a relay switch 28 is connected, and the photoelectric conversion unit 27 is connected to a light receiver 23, and the light receiver 23 When the light is received, the switch 28 is closed, and a relay 29 for opening and closing the first and second switches 31 and 32 in cooperation with the excitation and non-excitation of the coil 30 is provided at the subsequent stage of the control unit 25. , One end of the coil 30 is connected to one contact 28a of the relay switch 28 and the other end is connected to the AC power supply 24, and both contacts of the first switch 31 are connected to the other contact 28b of the relay switch 28 and an air contact. The solenoids of the 4-port 2-position electromagnetic switching valve 35 for switching the air supply path from the supply source 34 are connected to the solenoids of the second switch 32. Contacts, a DC power supply unit 26 described above,
When the relay switch 28 is connected to the second light emitter 22, the coil 30 of the relay 29 is energized to actuate the first and second switches 31 and 32 to close, and the first light emission described above is performed. Since the other terminal of the light emitting device 21 is directly connected to the other end of the DC power supply unit 26, the first light emitting device 21 always emits a beam, while the second light emitting device 22 has a relay 29. Is connected to the DC power supply unit 26 via the second switch 32, and emits a beam only when the second switch 32 is closed. The solenoid of the switching valve 35 is excited, and the two connecting ports 41 and 42 of the electromagnetic switching valve 35 are respectively connected to the front chamber 14a and the rear chamber 14b of the steering air cylinder 14 described above.
It is connected to the.

Next, the operation of this embodiment will be described.

When the traveling path of the sanding belt 6 shifts to the back side and the front edge of the sanding belt 6 moves to the back side of the first light emitter 21, as shown in FIG. 3, the beam from the first light emitter 21 is received. The relay switch 28 is closed via the photoelectric conversion unit 27 of the control unit 25, and the coil 30 of the relay 29 is energized to receive the light.
1, 32 are closed, the second light emitter 22 is turned on by the closing of the second switch 32 to emit a beam, and the electromagnetic switching valve 35 is switched by the closing of the first switch 31, and the rear of the air cylinder 14 is closed. The air is supplied to the chamber 14b and the air in the front chamber 14a is discharged, whereby the piston rod 15 advances and the steering frame 11 moves the ram 10
The shaft A of the steering roller 5 tilts counterclockwise to the position A ₁ by rotating the steering belt 5 by a certain angle in the counterclockwise direction, whereby the sanding belt 6 gradually moves to the front side,
On the way, as shown by the chain line in the figure, when the edge of the sanding belt 6 comes to the front surface of the first light emitter 21, the beam from the first light emitter 21 is blocked by the sanding belt 6 to receive light. Although the light is not received by the device 23, the beam is emitted from the second light emitter 22 and is received by the light receiver 23 as described above. Therefore, the relay switch 28 remains closed and the relay 29
The first and second switches 31 and 32 are kept closed, the second light emitter 22 is kept in the light emitting state, and the electromagnetic switching valve 35 is kept in the above switching state. When it moves to the front side and the edge of the sanding belt 6 moves to the position in front of the second light emitter 22, as shown in FIG. 4, the beam from the second light emitter 22 is also blocked by the sanding belt 6. Is not received by the light receiver 23,
When the relay switch 28 of the control unit 25 is opened and the coil 30 of the relay 29 is de-energized, the first and second switches 31 and 32 are opened, the second light emitter 22 stops emitting light, and The solenoid of the switching valve 35 is de-energized, the air supply path is switched, air is supplied to the front chamber 14a of the air cylinder 14, and air is discharged from the rear chamber 14b, whereby the piston rod 15 moves backward, When the steering frame 11 swings clockwise, the axis A of the steering roller 5 tilts clockwise to the position A ₂ , whereby the sanding belt 6 begins to move to the back side, and in the middle thereof. As shown in FIG. 2, the edge of the sanding belt 6 is separated from the front surface of the second light emitter 22, but as described above, the second light emitter 22 is in a state where the light emission is stopped. Therefore, the light receiver 23 does not receive light, and the relay switch 28 remains open.
The first and second switches 31 and 32 are kept open, the second light emitter 22 is kept in the light emission stopped state, and the electromagnetic switching valve 35 is kept in the above switching state, so that the sanding belt 6 is Moving further back, as shown in FIG. 3,
When the edge of the sanding belt 6 passes over the front surface of the first light emitter 21 again, since the first light emitter 21 always emits a beam, the beam is received by the light receiver 23, and the same operation as described above is performed. As a result, the sanding belt 6 again moves to the front side, and by repeating these operations, the edge of the sanding belt 6 repeats the reciprocating motion in the width direction within a certain range B and travels on a substantially constant orbit. To do.

In the above embodiment, the photoelectric switch device including the light emitters 21 and 22 and the light receiver 23 is exemplified as the device for detecting the edge position of the sanding belt 6, but instead of this,
An ultrasonic switching device consisting of a transmitter that emits ultrasonic waves and a receiver that receives the ultrasonic waves may be adopted. For such an ultrasonic transmitter that emits a signal in a divergent manner, two transmitters are used. The vessels may be arranged in a parallel posture. Further, the light emitters 21 and 22 and the light receiver 23, or the ultrasonic wave transmitter and the receiver may be arranged so as to face each other in the opposite direction to the above embodiment with the sanding belt 6 interposed therebetween.

Further, the drive mechanism of the steering roller 5 is not limited to the one using the air cylinder 14 shown in the above-mentioned embodiment, but may be another method such as one using forward / reverse drive of a motor or one using a solenoid. May be.

[Brief description of drawings]

FIG. 1 is a side view of a belt sander to which an embodiment of the present invention is applied, FIG. 2 is a circuit configuration diagram of this embodiment, and FIGS. 3 and 4 are circuit configuration diagrams for explaining the operation thereof. 5: Steering roller, 6: Sanding belt, 11: Steering frame, 12: Steering arm, 14: Air cylinder,
15: Piston rod, 16: Fitting groove, 21: First light emitter, 22: Second light emitter, 23: Light receiver, 25: Control unit, 28: Relay switch, 29: Relay, 35: Electromagnetic switching valve

Claims (1)

[Scope of utility model registration request] 1. Two oscillators, which emit signals such as light and ultrasonic waves, are provided on one side of the end of an endless sanding belt which circulates and which sandwiches the sanding belt, in the width direction of the sanding belt. And one receiver for receiving a signal from each of the transmitters is arranged on the opposite side from the first transmitter on the side close to the center of the sanding belt. A relay controller which is always transmitted and allows the second transmitter on the far side to switch between transmitting and stopping and transmitting and stopping an operation signal to the receiver depending on whether the receiver is receiving or not. And a drive mechanism for moving the sanding belt in the width direction by alternately tilting the transmission state of the second transmitter and the axis of the steering roller depending on the presence or absence of the operation signal to the relay controller. Connect a relay that switches between the Then, the driving direction of the driving mechanism is switched based on the reception state of the receiver, and the sanding belt is alternately moved in the width direction, so that the traveling trajectory of the sanding belt is corrected. A traveling orbit control device for a sanding belt in a belt sander characterized by the following: