JPH044111B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a rake-equipped rotary shear that successively cuts a traveling sheet-like material by a set cutting length using a rake-equipped rotary shear.

``Prior art'' Conventionally, a rotary shear was used as a control device to control the cutting of material by set cutting length.
The one shown in Publication No. 46385 is known. To briefly explain this, as shown in FIG. 4, the material 11 is traveling in the direction indicated by an arrow 12, and the rotary shear 13 is rotationally controlled by a motor 14. A rotary encoder 16 is rotationally driven by a roller 15 that rolls into contact with the material 11, and a pulse is generated from the rotary encoder 16 every time the material 11 moves by a certain length, and this pulse is input to a control device 18. On the other hand, the rotary encoder 19 is driven by the rotation of the motor 14, and pulses are generated in accordance with the rotation, and these pulses are also input to the control device 18. The set cutting length L _p is input from the setting device 21 to the control device 18 .

The control device 18 controls the traveling speed of the material 11 detected from each pulse of both rotary encoders 16 and 19 so that the rotation speed of the blade of the rotary shear 13 becomes the same speed when cutting the material 11. , the pulses of the rotary encoder 16 are counted to detect the moving length of the material 11, and the pulses of the rotary encoder 19 are counted to detect the moving length of the blade of the rotary shear 13, and from these and the set cutting length L _p The material is controlled to be cut in a state where the material protrudes from the cutting edge of the rotary shear 13 by a set cutting length L _p .

When the diameter of the rotating circle of the cutting edge of the rotary shear 13 is D, if the rotational circumference πD of the blade is equal to the set cutting length L _p , then if the rotary shear 13 is rotated at approximately the same speed, The material can be cut to a set cutting length by rotation, and the speed of the blade during cutting can be made to match the speed of the material. The set cutting length at this time is called the synchronization length _Ls .

If the set cutting length L _p is longer than the synchronization length L _s , the speed is decelerated once during one revolution of the rotary shear 13 to let the material go a little, and then the material traveling speed and the blade moving speed are synchronized during cutting. The control device 18 performs control to increase the speed as shown in FIG. Therefore, the speed control for the rotary shear is as shown in FIG. 5A. In FIG. 5A, V ₁ is a speed synchronized with the material speed, and time t _c indicates the material cutting time.

If the set cutting tone L _p is shorter than the synchronous tone L _s ,
As shown in Fig. 5B, during one revolution of the rotary shear, the speed increases above the cutting speed V ₁ and then decelerates.
Control is performed to cut in synchronization.

"Problems to be Solved by the Invention" In the conventional rotary shear shown in Fig. 4, when the set cutting length L _p becomes shorter than the synchronous length L _s , a short period of time occurs as shown in Fig. 5 B. It becomes necessary to suddenly accelerate the motor 14 and then suddenly decelerate it. In order to accelerate and decelerate the shear in this way, it is necessary to use a motor 14 with high horsepower.
Accordingly, the machines become larger and more expensive. However, in reality, the larger the motor, the greater the inertia, which makes it difficult to cut short pieces. Reducing the rotating diameter D of the rotary shear's cutting edge makes it possible to cut relatively short lengths, but there are limits to mechanically reducing the drum diameter of the rotary shear, such as the drum shaft being deflected in the width direction of the material 11. There is.

Therefore, when the set cutting length L _p becomes shorter, the actual situation is that the material traveling speed has no choice but to be reduced accordingly. As shown in Figure 6A, the synchronization length L _s is
Taking an 880mm machine as an example, if the maximum cutting speed is 240m/min, if the length is shorter than 880mm, the maximum cutting speed will decrease rapidly.
If the set cutting length is 220 mm, the material traveling speed must be, for example, 20 m/min. In a shear line where the sole purpose is cutting, there is no problem with lowering the line speed, but this will result in lower productivity operations. In online cutting in many processes where various processing is performed before cutting, processing speed is the main factor.
You can't lower the line speed just for cutting. In that case, you end up not being able to make short products and have no choice but to cut them into long pieces. After that, it must be recut offline, which requires additional yards, equipment, and manpower.

By the way, when cutting thin and soft sheet-like materials such as paper and film, it is not necessary to synchronize the blade speed with the material traveling speed, but simply setting the blade speed faster than the material traveling speed. It has the characteristic that a relatively good cut can be obtained.

In addition, when cutting a sheet-like material, a good cut can be obtained by cutting from one edge to the other, like cutting with scissors. For this kind of cutting, rotary shears often have straight cutting edges, but are installed at an angle (RAKE), as shown in Figure 3A when the cylindrical drum is unfolded. A shear with a rake of this kind, which is extremely slight but usually less than 1°, is often used. The purpose of this invention is to take advantage of the above two features, and one is to reduce the material speed even when the set cutting length is shorter than the synchronous length, as shown in Fig. 6B, regardless of the cutting length. Maximum running speed of cutting material is 240m/
The purpose is to provide a shear that will remain at min. However, in this case, as will be described later, if the installation of the shear is fixed, the four corners of the rectangular shape of the cut sheet will be different from each other due to a change in the cutting length. Therefore, another object of the present invention is to
By automatically changing the intersection angle of the shear installation base with respect to the sheet running direction as the cutting length setting is changed, the rake can cut sheets at a constant angle regardless of the cutting length. Our objective is to provide a rotary shear with an attached rotary shear.

"Means for Solving Problems" According to the present invention, there is provided a rotation control means for controlling the rotation of a rotary shear, and an intersection angle for changing the angle formed between the rotation axis of the rotary shear and the running direction of the sheet material. Control means are provided.

This rotation control means causes the rotation of the shear to follow the travel of the sheet-like material at a constant ratio determined by the set cutting length, and controls the shear so that the shear drum rotates once when the sheet-like material travels by the set cutting length. control the rotation of

On the other hand, the crossing angle control means is configured to be able to change the angle between the rotation axis of the shear and the running direction of the sheet-like material by rotation of a motor, and drives the motor to rotate in accordance with changes in the set cutting length. Change the intersection angle.

Because of this configuration, even if the set cutting length is shorter than the synchronous length, the rotational speed of the shear is increased according to how short it is, and the material is successively cut to the set cutting length at a nearly constant rotational speed. cut,
In addition, since the material is a thin sheet, it can be cut with a relatively good cut edge, and the angle between the material running direction and the shear rotation axis is automatically changed according to the set cutting length, so that the sheet material can be cut at all times. Can be cut at the same angle.

Embodiment FIG. 1 shows a control system in an embodiment of the present invention, and parts corresponding to those in FIG. 4 are given the same reference numerals. Pulses from the encoder 16 generated in response to the running of the sheet material 11 are transmitted to the rotation control means 3.
1, pulses from the rotary encoder 19 generated in response to the rotation of the blade of the rotary shear 13 are also input to the rotation control means 31, and furthermore, the set cutting length L _p from the setting device 21 is also input to the rotation control means 3.
1 is input.

The rotation control means 31 rotates the sheet material 1 at a constant ratio determined by the input set cutting length L _p .
A speed control loop is provided that causes the rotation of the shear to follow the travel of the shear. That is, in this example, the pulses of the encoder 16 are multiplied by 1/L _p in a multiplier 32 as described later, and the output thereof is converted into a voltage corresponding to the output pulse frequency of the multiplier 32 in a frequency-voltage converter 33. The converted voltage is input to the analog adder 34. On the other hand encoder 19
The pulses from the shear 13 are converted into a voltage corresponding to the pulse frequency by the frequency-voltage converter 35, and a voltage corresponding to the rotational speed of the blade of the shear 13 is obtained. This voltage is input to an analog adder 34 and the difference between it and the output of the frequency voltage converter 33 is calculated.
4 is controlled. As a result, the motor 14 is controlled to follow the reference speed of the frequency-voltage converter 33.

Here, the multiplier 32 will be briefly described. When the currently set cutting length L _p is equal to the synchronous length L _s , the multiplier of the multiplier 32 required to make the rotational speed of the blade of the shear 13 match the traveling speed of the material 11 is defined as m. When the set cutting length L _p is smaller than the synchronous length L _s (L _p < L _s ), in order for the blade of the shear 13 to rotate once by moving the material 11 by L _p , the traveling speed of the material 11 must be The rotation angle of the blade of rotary shear 13 is
Just multiply it by L _s /L _p . Therefore, the multiplier in the multiplier 32 is mL _s /L _p . In this way, if the set cutting length L _p is shorter than the synchronous length L _s , the shear 1
When the rotational speed of the blade 3 is increased and the material 11 moves by the set cutting length L _p , speed control is performed so that the blade of the rotary shear 13 rotates once every time. However, as mentioned above, if the speed is slower than the synchronous length L _s , the cut will be poor, so if the set cutting length L _p is longer than the synchronous length L _s (L _p L _s ), the multiplier of 32 is a fixed value. m
shall be.

The rotation control means 31 makes such a speed control loop into a minor loop, and also provides a positioning control loop as a major loop to position and control and set the rotation angle of the blade of the shear 13 every unit length of the material 11, for example, 0.05 mm. Positioning during the run is performed so that the material is cut with the tip of the material protruding from the shear blade by the cutting length L _p . Therefore, encoder 1
Digital adder 3 every time 6 pulses are input.
7, the numerical value G/L _p is added, and each time a pulse is input from the encoder 19, the numerical value K is subtracted by the digital adder 37. The output of this digital adder 37 is converted into an analog voltage by a DA converter 38, and the analog voltage is supplied to an analog adder 34 as a correction signal.

In a state where this positioning control is stable, the rotation angle of the shear 13 is servoed to the movement of the material 11 in a state where the addition input and the subtraction input in the digital adder 37 are equal. For example, the circumferential length of the roller 15 that contacts the material 11 is 400.02 mm, and the encoder 1
6 and 19 each output 8000 pulses per rotation, and the reduction ratio of the reducer 39 interposed between the motor 14 and the rotary shear 13 is 1:2.4.
When the material 11 is fed by the set cutting length L _p mm, the pulses generated from the encoder 16 are L _p /400.02×8000, and the pulses generated from the encoder 19 during one revolution of the shear 13 are 8000×2.4. If positioning control is performed correctly, the change in the output of the digital adder 37 will be O, that is, L _p /400.02×8000×G/L _p =8000×2.4×K. Therefore, it is sufficient to set K=G/400.02×2.4. G is a parameter that can be called sensitivity and may have any value, but if it is too large, the weight of one pulse from the encoder becomes large, making control unstable.

In the rotation control means 31, the set cutting length L _p from the setting device 21 is input to the divider 41;
The calculation of G/L _p is performed in the step 1, and the result is given to the digital adder 37 as an addition constant. Further, K is provided from the setter 42 to the digital adder 37 as a subtraction constant. However, for the same reason as speed rape, if the set cutting length L _p is longer than the synchronous length L _s (L _p
L _s ) fixes the output of the divider 41 to G/L _s . Then, similar to the control shown in FIG. 4, the speed waveform shown in FIG. 5A is created. The method may be a conventional one, but here we will explain a method using the above control means used when L _p <L ₄ as is, as an example. In the rotation control means 31 that rotates the shear once while traveling by L _p , in this case also, the divider 41 outputs G/
There is no problem if L _p is outputting. However, since we do not want the speed to drop below the synchronous speed (the speed when cutting the synchronous length L _s ) due to the cut, we fix the output of the divider 41 to G/L _s .
All you have to do is deduct that amount. Current setting cutting length
If the total number of pulses generated from the encoder 16 when the material 11 travels by L _p is nL _p , then nL _p
It is sufficient to correct by (G/L _p -G/L _s )=nG (1-L _p /L _s )=N. Therefore, in the rotation control means 31, the setting device 2
The set cutting length L _p from 1 and the synchronization length L _s from the setter 43 are input to the calculator 44 to calculate the above N,
The N is added to the adder 37 every time one cutting is completed. Since this is only the case when L _p L _s , N is negative. When the cutting is completed and N is added, the outputs of the adder 37 and the DA converter 38 become negative and decelerate as shown in FIG. 5A. However, since the accumulation of G/L _s comes into effect after that, the adder 37 converges to zero, and the shear accelerates accordingly, and the shear 13 increases as the material 11 moves.
Cutting begins with the rotation angles of the two servos synchronously servoing.

Next, in this invention, the rotary shear 13 with a rake is used, and the angle between the rotation axis of the rotary shear 13 and the moving direction of the material 11 is the set cutting length.
Changed according to L _p . The necessity of this will be discussed below. When the rotating drum of the rotary shear 13 with rake is unfolded, the cutting edge is a slightly inclined diagonal line as shown in Fig. 3A, as mentioned before, and there is a screw thread on the drum as shown in Fig. 3B. It's getting better. The rake is tan ⁻¹ l/W. In order to cut like scissors, cutting continues for a certain angle from the start of cutting to the completion of cutting, when viewed from the rotation angle of the drum. This cutting edge rotation angle θ° (FIG. 3C) is θ=l/L _s ×360°. In addition, the rotating shaft of the rotating drum is slightly inclined with respect to the running direction of the sheet-like material 11, as shown in _FIG . Material 11 as you progress
is cut in the width direction, and the material 11 completes the cutting at the other side edge P ₂ of the material 11. When it is desired to cut the material at _the cutting angle H (the angle between _the side edge of the material and the cutting line) _{in FIG} .

Next, find the length λ of _{1 p} . As mentioned earlier, in this invention, the set cutting length L _p is equal to the synchronization length L _s
If it is shorter, the rotation is controlled by setting the apparent synchronous length to L _p . In other words, the drum rotates once at a nearly constant speed while the material advances L _p . The length λ of the material advanced during the cutting angle θ of the cutting edge is therefore λ=L _p ×θ/360=L _p /L _s ×l. That is, λ must be changed in accordance with the change in L _p .

Therefore, in the present invention, when the set cutting length L _p is shorter than the synchronous length L _s , the angle between the rotating shaft of the rotary shear and the material travel angle is changed in accordance with the set cutting length L _p . As shown in FIG. 1, the set cutting length L _p from the setter 21 is input to the calculator 71, which calculates λ. The encoder 72 is driven by the rotation of the motor 63, the pulses from the encoder 72 are counted by the counter 73, the difference between this counted value and the calculation result of the arithmetic unit 71 is taken by the digital adder 74, and the pulse of the digital adder 74 is The output is converted into an analog signal by a DA converter 75. encoder 7
2 pulses are supplied to the frequency-voltage converter 76 to obtain a voltage corresponding to the rotational speed of the motor 63. The difference between this and the output of the DA converter 75 is calculated by the analog adder 77, and the output is used to calculate the speed. Motor 63 is driven through amplifier 78. In other words, motor 63
The rotation of the rotary drum 56, that is, the angle of the axis of the rotary shear 13 with respect to the material running direction, is controlled, and a value corresponding to the angle is obtained as the count value of the counter 73, and this and the calculation result of the calculator 71 are combined. If there is a difference, the motor 63 is rotated so as to eliminate this difference, and the angle between the axis of the rotary shear 13 and the material running direction is changed to a desired angle. Note that when the set cutting length L _p is longer than the synchronization length L _s , the calculator 71 outputs a fixed value l. In this case, the encoder 72 may be absolute rather than incremental, and the counter 73 may be replaced by a code reader. For example, as shown in FIG. 2, the rotary shear 13 is provided with fixing bases 51 and 52 facing each other across the material 11 from the width direction.
The rotary shear 13 is held between these fixed stands 51 and 52. Supports 53 and 54 are disposed facing each other on the fixed tables 51 and 52, and the supports 53,
A fixed lower blade 55 is attached across the space between the blades 54 and 54. Further, a rotating drum 56 is rotatably held between the supports 53 and 54. An upper blade 57 with a rake is attached to the circumferential surface of the rotating drum 56. The rotation of the motor 14 on the fixed base 52 is transmitted to the rotating drum 56 via the speed reducer 39 . The speed reducer 39 and the rotating drum 56 are coupled by a flexible coupling 58. The support 54 is allowed to rotate slightly about a pivot 59.

On the other hand, one end of the ball screw 62 is rotatably connected to the support 53, and the other end is connected to the motor 6 on the fixed base 51.
It is connected to the rotating shaft of No. 3. By rotating the screw 62, the support base 53 can be slid on the fixed base 51 about the pivot 59.
The material 11 is inserted between the lower blade 55 and the rotating drum 56, and is cut by the lower blade 55 and the upper blade 57 as the drum 56 rotates.

In the above description, the lower blade of the rotary shear 13 is a fixed blade, but the present invention can also be applied to a rotary shear in which the lower blade also rotates. Further, various calculations can be performed by an electronic computer. For example, in FIG.
DA converter 38, 75, divider 41, arithmetic unit 4
4, 71, and counter 73 may be configured to be processed by an electronic computer. Furthermore, in the above description, cutting is possible not only when the set cutting length L _p is shorter than the synchronization length L _s but also when it is longer. It can be simplified by omitting .

``Effects of the Invention'' As described above, according to the present invention, there is no need for rapid acceleration/deceleration rotation control even when the set cutting length is shorter than the synchronous length, and high-speed operation can be achieved with a relatively small motor. . Therefore, there is no need to change the material traveling speed, and even if the cutting length is short as shown in FIG. 6B, for example, cutting can be performed at the maximum material traveling speed of 240 m/min.

However, with only this rotation control, as long as the rake-equipped shear has the disadvantage that the cutting angle of the material, that is, the four corners of the quadrilateral, changes depending on the cutting length, in the present invention, the cutting angle of the material changes depending on the set cutting length. Since the intersection angle between the rotation axis of the shear and the material running direction is automatically changed by the intersection angle control means, the cutting angle of the material remains constant even if the set cutting length is changed.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the electrical configuration of an example of a rotary shear with a rake according to the present invention;
Figure 2 is a perspective view showing an example of the mechanism of the present invention, Figure 3A
Figure 3B is a perspective view of the same shear drum; Figure 3B is a perspective view of the rotary shear drum;
Figure 3C is a diagram showing the rotation angle of the drum necessary for cutting, Figure 3D is a diagram showing the angle between the rotary shear and the material, and Figure 4 is a block diagram showing a conventional rotary shear control device. , FIG. 5 is a diagram showing an example of the change over time in the rotational speed of the rotary shear in the control device of FIG. 4, and FIG. Diagram A
is the case of the conventional shear, and FIG. 6B is the case of the shear of the present invention.

Claims (1)

[Scope of Claims] 1. In a rotary shear with a rake that cuts a traveling sheet-like material intersecting the traveling direction thereof, the shear is applied to the traveling sheet-like material at a constant ratio determined by a set cutting length. rotation control means for controlling the rotation of the shear so that the shear follows the rotation and the shear rotates once when the sheet-like material travels by the set cutting length; It is configured such that the angle formed with the running direction can be changed by rotation of a motor, and is characterized by comprising a crossing angle control means for driving the motor in accordance with the set cutting length to change the crossing angle. Rotary shear with rake.