JPS6140613B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a thin plate cutting apparatus that automatically cuts a plate material of an arbitrary shape from a thin plate.

Conventionally, when cutting an arbitrary shape other than a rectangle from a plate material such as a glass plate, such as an oval or a potbellied shape, a wooden mold of the same shape as the cutting shape is formed in advance, and this wooden pattern is pressed against the plate material. A roller or the like was pressed along the periphery of the mold and moved several times to cut the mold. In such conventional board cutting, it is very expensive to form a wooden mold of the same shape as the board cutting shape, so there is a drawback that the boarded items are expensive. In order to fit it along the periphery of the mold, the periphery of the wooden mold would wear down, resulting in deformation of the wooden mold, and after a certain amount of use, a new wooden mold had to be made.

This invention was made in view of the above circumstances, and includes recording the shape of the cutout in advance on a magnetic sheet, and providing a magnetic sensor that detects the recorded shape and moves along the shape. It is an object of the present invention to provide an automatic board cutting device for cutting a thin plate, which can automatically cut a board into an arbitrary shape by moving a cutting blade, and which eliminates the need for a wooden mold.

The present invention will be described below based on embodiments shown in the accompanying drawings.

As shown in FIGS. 1 and 2, guide rails 2 and 2' are provided on both sides of a horizontal table 1 on which a plate glass A is placed, and guide rails 2 and 2' are provided in parallel with the table 1. The member 3 has side portions 4, 4' fixed on both sides thereof movably attached to guide rails 2, 2'. An X-axis motor 5 is provided on the side portion 4' of the bar material 3,
When this motor 5 is rotated, the bar material 3 moves along the guide rails 2, 2'.

A slider 6 that is movable in the axial direction of the bar material 3 is attached to the bar material 3, and when the Y-axis motor 7 provided on the slider 6 is rotated, the slider 6
moves along the bar material 3. A vertically movable lifting shaft 8 is attached to the slider 6 and extends vertically downward, and a holder 10 for holding a cutting blade 9 is fixed to the lower part of the lifting shaft 8.
The slider 6 also has a sensor group 1 arranged above the lifting shaft 8 and consisting of a plurality of magnetic sensors 11a, 11b...
1 is fixed. Note that the lifting shaft 8 is driven by an air cylinder or the like.

Above the sensor group 11, a support member 14 including a top plate 12 for supporting the magnetic sheet B is erected from a support plate 13 provided parallel to the guide rail 4'.
It is rotatably mounted on the This top plate 12
is restricted from rotating to the right by coming into contact with the support plate 13 to a position where it is almost parallel to the table 1, and from this state to the left due to the structure of the support member 14, the rotation is controlled by the dashed-dotted line in FIG. As shown in
It is installed so that it can rotate up to 180 degrees (see Figure 3). Note that the magnetic sheet B is fixed to the top plate 12 with double-sided tape or a suitable support member, but another table parallel to the table 1 is provided,
It may be placed on this table and prevented from moving by using a presser cover or the like from above.

The table 1 is constructed of a belt conveyor 15 so that the glass plate A can be conveyed, and the glass plate A is equipped with an air suction device (not shown) to prevent the glass plate on the table 1 from moving.
It is fixed by suction.

Next, the control means of the above-mentioned board cutting device will be explained based on the drawings from FIG. 4 onwards.

As shown in FIG. 4, a curve D of an arbitrary shape (in FIG. 4, it is a potbellied shape) is drawn with a magnetic pen on the magnetic sheet B whose surface is magnetized to the south pole. As shown in Figure 5, the center of curve D is N
The north pole is magnetized at the boundary between the pole and the south pole and has a predetermined width on the inside (note that the north pole may be magnetized with a predetermined width on the outside). Further, the sensor group 11 consists of eight magnetic sensors 11a, 11b...11h arranged concentrically and at equal intervals, and each magnetic sensor outputs an electric signal proportional to the strength of the magnetic field. They are selected or adjusted, such as by amplifiers, to generate the same electrical signal for the same magnetic field strength.

As shown in FIG. 6, when the start signal is input to the X-axis motor speed command device 17 and the Y-axis motor speed command device 18, which receive the start signal from the start switch 16, the The shaft motor 7 is driven at the maximum speed Vo. In addition, the start signal and each magnetic sensor 1 of the sensor group 11
Electrical signals a, bb... from 1a, 11b...11h
... h is input to the adder 19, each of the electrical signals a,
b...h is added and the average value is output as an average value signal, and when the average value becomes zero for the first time after the start signal is input, the curve D
A curve detection signal is generated to indicate that the curve has been detected. Further, when the start signal is input, the moving direction storage section 20 to which the start signal is input stores the moving direction signal as the b direction. In addition, the elevating shaft 8 is lowered in response to the curve detection signal, and the cutting blade 9 comes into contact with the plate glass A.

A stop signal from the stop switch 21, an average value signal and a curve detection signal from the adder 19, a pulse signal from the pulse oscillator 22, and a magnetic sensor 1
Electrical signals a, b,... from 1a, 11b...11h
The signal processing unit 23 which receives h as an input enters a reset state in which signal processing is stopped by the stop signal,
A set state is entered in which signal processing is performed in accordance with the curve detection signal, and a signal is issued that is valid only in the set state. That is, when the magnetic sensor is in the set state and a pulse signal is input, the comparator 24 selects the electric signals a, b...h that match or most closely approximate the average value signal, and selects the magnetic sensor. , a magnetic sensor facing this magnetic sensor (for example, if the magnetic sensor 11a is selected, the opposing magnetic sensor is 11e) is selected and stored in the tangential direction sensor storage section 25 as the magnetic sensor in the connection direction. Make me remember. In addition, two magnetic sensors located perpendicular to the magnetic sensor stored in the connection direction sensor storage unit 25 (for example, if the stored magnetic sensors are 11a and 11e, two magnetic sensors located perpendicular to the magnetic sensor stored in the connection direction sensor storage section 25) The magnetic sensor is 11c, 11
The average value generating section 26 to which the electric signal h is inputted outputs an average value speed Vm based on the average value of the electric signals inputted from the magnetic sensor.

The moving direction determining section 27 receives as input the moving direction signal from the moving direction storage section 20 and the tangential direction magnetic sensor from the tangential direction detection sensor storage section 25.
The smaller rotation angle from the moving direction signal to the magnetic sensor in the tangential direction is selected and stored in the moving direction storage unit 20 as a new moving direction signal, and the selected magnetic sensor in the tangential direction is set in the moving direction. If the signal is orthogonal to the signal, the one in which the detection signal of the magnetic sensor in the selected connection direction is closer to zero is stored.

Further, a speed calculator 28 receives the moving direction signal from the moving direction storage section 20 and the average speed Vm from the average value signal generating section 26, and operates at the maximum speed.
Based on Vo and the average speed Vm, X and Y speed signals Vx and Vy are output to the X and Y axis motor speed command devices 17 and 18. The X and Y speed signals Vx and Vy are as follows: Vx=√ ² + ₂ cos (θ ₀ + θ) (1) Vy=√ ² + ₂ sin (θ ₀ + θ) (2). Here, θ=ten ^-1 Vm/Vo θ ₀ = nπ/4, and n is when the moving direction signal is in the a direction.
a, b, c...h so that it becomes 1 in the 0b direction
It is an integer starting from 0 and ending at 7.

Next, the operating method etc. of this invention will be explained.

First, slider 6 is on the leftmost side,
In addition, the X-axis motor 5 and the Y-axis motor 7 are operated by manual switches (not shown), and the magnetic sheet B is supported on the top plate 12 so that the origin is at the lowest point (see FIG. 1). , and place the plate glass A at a predetermined position on the table 1. Next, when the start switch 16 is operated, a start signal is issued, and the maximum speed Vo of the motors 5 and 7 is input to the X and Y axis motor speed command devices 17 and 18, respectively, and the X and Y speed signals Vx and Vy are Vo, and the motors 5 and 7 are each driven by Vo. Furthermore, since the sensor group 11 does not detect the curve D when the motors 5 and 7 start driving, but detects the S pole where the magnetic sheet B is magnetized in advance, the average value signal of the adder 19 is , is not zero and the sensor group 11 is curve D
When the center of the sensor group 11 coincides with the curve D, it becomes zero, and a set signal that activates the signal processing section 23 is generated.

When the signal processing section 23 enters the set state,
Every time a pulse signal from the pulse oscillator 22 (the frequency of this continuously emitted pulse signal is determined by accuracy, motor speed, etc.) is input, the comparator 24 calculates the average value signal from the adder 19. The connection direction sensor storage unit 2 selects the detection signal that matches or is most similar to the magnetic sensor in the connection direction.
5, and the average value generating section 26 generates an average value velocity Vm based on the average value of the detection signals from the magnetic sensors arranged perpendicular to the stored magnetic sensor.

Further, based on the signal from the connection direction sensor storage section 25 and the movement direction signal from the movement direction storage section 20, the movement direction determination section 27 stores a new movement direction signal in the movement direction storage section. This new direction of movement and the average speed to compensate for the direction of movement.
Based on Vm, the speed calculation unit 28 outputs X and Y speed signals Vx and Vy as shown in equations (1) and (2), and based on these speed signals, the X and Y axis motors 5 and 7 is driven.

For example, the relationship between the sensor group 11 and the curve D at the time when the pulse signal is emitted from the pulse oscillator 22 is such that the center of the sensor group 11 is slightly shifted from the curve D, as shown in FIG. Assuming that the moving direction stored in the moving direction storage unit 20 so far is the direction of the magnetic sensor 11b, and the average value signal of the adder 19 is the closest value to the detection signal of the detection sensor 11a, the tangential direction sensor The magnetic sensors 11a and 11e are selected in the storage unit 25, and the movement direction storage unit 20 stores the new movement direction of the magnetic sensor 11a as the movement direction, and also stores the magnetic sensors 11a and 11e located perpendicularly to the magnetic sensor 11a and 11e as the movement direction. Based on the average speed Vm corresponding to the average value of the detection signals from the sensors 11c and 11g (this Vm is output with a sign opposite to the actual sign), the speed Vu and the speed Vu are calculated as shown in FIG. Since the sensor group 11 moves along the actual curve D, board cutting can be performed based on the curve recorded on the magnetic sheet B.

After moving along the curve D several times in the manner described above, the glass plate A can be bent and released, and the slider 6 is stopped by operating the stop switch 21.

The lifting shaft 8 is lowered by the set signal from the adder 19 to bring the cutting blade 9 into contact with the plate glass A.
Raised by the stop signal. Further, it is desirable that the stop signal be issued even when the power is turned on to the device of the present invention, so that abnormal operation does not occur after the power is turned on. Furthermore, the number of magnetic sensors is arbitrarily determined depending on the accuracy, and the material to be cut out may be a thin plate of iron, synthetic resin, or the like instead of glass.

As described above, the present invention provides a group of magnetic sensors that detect a curve drawn on a magnetic sheet, and uses a detection signal from the sensor group to move a slider provided with the magnetic sensor and a cutter along the curve. Because of this, there is no need for a wooden mold as in the past, and there are advantages in that arbitrary board cutting can be done automatically. In addition, the magnetic sheet can be used indefinitely by erasing and recording the board cutting curve.
It is possible to produce a board of any shape at a very low cost.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway plan view showing an example of this invention, Fig. 2 is a front view of Fig. 1, Fig. 3 is an enlarged view of the main part of Fig. 1, and Fig. 4 depicts a cutout curve. FIG. 5 is a graph showing magnetism in a cross section taken along the line E-E, FIG. 6 is an explanatory diagram showing an example of a magnetic sensor group, and FIG. 7 is a block diagram showing an example of the present invention. It is a diagram. A...Plate glass, 1...Table, 2, 2'...
...Guide rail, 3...Bar material, 4, 4'...Side part, 5, 7...Motor, 6...Slider, 8...
Lifting shaft, 9... Cutting blade, 10... Holder, 11...
...Sensor group, 11a, 11b...Magnetic sensor, 1
2...Top plate, 13...Support plate, 14...Support member, 15...Belt conveyor, 16...Start switch, 17...X-axis motor speed command device, 18
... Y-axis motor speed command, 19 ... Adder, 2
0...Movement direction storage unit, 21...Stop switch, 22...Pulse oscillator, 23...Signal processing unit, 24...Comparison unit, 25...Connection direction sensor storage unit, 26...Average value generation unit, 27 ...Movement direction determination section, 28...Speed calculation unit.

Claims (1)

[Claims] 1. A top plate supporting a magnetic sheet is provided parallel to the table above the table on which the thin plate is placed, and a slider is provided between the top plate and the table so as to be movable independently in the vertical and horizontal directions. A magnetic sensor group for detecting the cutout curve recorded on the magnetic sheet is installed on the upper part, and a cutter is installed below the magnetic sensor group so as to be movable up and down.The slider is moved along the curve based on the detection signal of the magnetic sensor group. A device for cutting a sheet from a thin sheet, which is provided with a control means for moving the thin sheet and extracts a shape having the same shape as a curve recorded on a magnetic sheet from the thin sheet.