JPS63102894A - Rotary shear with rake - Google Patents

Abstract

(57) [Abstract] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

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

``Prior Art'' Conventionally, a control device disclosed in Japanese Patent Publication No. 52-46385 is known as a control device for controlling the cutting of a material by a set cutting length using a rotary shear. To briefly explain this, as shown in FIG. 4, the material 11 is traveling in the direction indicated by the arrow 12, and the rotary shear 13 is controlled by the motor 4 to rotate multiple times.

A rotary encoder 16 is rotationally driven by a roller 15 that rolls into contact with the material 11, and every time the material 11 moves a certain distance from the rotary encoder 16, a .P. russ is generated, and this .P russ is input to a control device 18. On the other hand motor 4
The rotation of the rotary encoder 19 drives the rotary encoder 19, and a noculus is generated in accordance with the rotation, and this noculus is also input to the control device 18. The set cutting length is input from the setting device 21 to the control device 18 .

The control device 18 makes sure that the traveling speed of the material 11 detected from each of the rotary encoders 16 and 19 and the rotation speed of the blade of the rotary shear 13 are the same speed when cutting the material 11. At the same time, 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. Set cutting length from L. The material is controlled to be cut in a state in which only the material protrudes from the cutting edge of the rotary ringer 13.

When the diameter of the rotating circle of the cutting edge of the rotary shear 13 is D,
The rotational circumference πD of the blade and the set cutting length. If they are equal, if the rotary shear 13 is rotated at approximately the same speed,
With just one rotation, the material can be cut to the set cutting length in one 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 synchronous length.

Setting cutting length. If the length is longer than the synchronous length, the rotary shear 13 decelerates once during one rotation to let the material pass for a while, and then increases the speed so that the material traveling speed and the blade traveling speed are synchronized during cutting. The control device 18 performs the control. Therefore, the speed control for the rotary shear is as shown in FIG. 5A. In FIG. 5A, (1) is a speed that is synchronized with the material speed, and time t0 indicates the material cutting time.

Setting cutting length. If is shorter than the synchronous length, then the fifth
As shown in FIG. B, during one rotation of the rotary shear, the speed is increased from the cutting speed v1 and then decelerated, and cutting is performed in synchronization.

"Problems to be Solved by the Invention" In the conventional rotary shear shown in Fig. 4, when the set cutting length Ld becomes shorter than the synchronous length L8, the problem occurs in a short period of time as shown in Fig. 5B. It becomes necessary to rapidly accelerate the motor 14 and then rapidly decelerate it.

In order to accelerate and decelerate the shear in this manner, it is necessary to use a motor 14 with a high horsepower, and the machine becomes correspondingly large and expensive. However, in reality, the larger the motor, the greater the inertia, so it is difficult to cut short pieces. Reducing the rotational diameter of the rotary shear's cutting edge allows relatively short cutting lengths, but mechanically reducing the drum diameter of the rotary shear may cause deflection of the drum shaft in the width direction of the material 11. has its limits.

Therefore, the setting cut length is longer. The reality is that if the length becomes shorter, there is no choice but to reduce the material running speed accordingly.

As shown in Figure 6A, if we take a machine with a synchronous length of 880 mm IJ as an example, the maximum cutting speed is 240 m1.
If the cutting length is 880 min, the maximum cutting speed decreases rapidly, and if the set cutting length is 220 min, the material traveling speed must be 20 m/min, for example. In a shear line where the sole purpose is cutting, there is no problem even if the line speed is lowered, but this results in lower productivity operations.

In online cutting in many processes where various processing is performed before cutting, processing speed is the main factor, so it is not possible to reduce the line speed just for cutting. In that case, you can't make short products and have 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; it is simply necessary to set the blade speed faster than the material traveling speed. It is characterized by a relatively good cutting edge.

In addition, when cutting a sheet-like material, a good cut can be obtained by cutting from one edge to the other, as with scissors. To prevent such cutting, rotary shears often have straight cutting edges, but are installed at an angle (RAKE), as shown in FIG. 3A when the cylindrical drum is unfolded. In many cases, a shear with a rake of about 1° or less is used, although it is extremely small. The purpose of this invention is to take advantage of the above two features, and one is to change the cutting length as shown in Figure 6B without slowing down the material speed even when the set cutting length is shorter than the synchronous length. The object of the present invention is to provide a shear which allows the maximum running speed of cutting material to remain at 240 m/min regardless of the cutting speed. 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.

Another object of the present invention is to automatically change the intersection angle with respect to the sheet running direction when the shear installation changes the setting of the cutting length, thereby cutting at a constant angle regardless of the cutting length. To provide a rotary shear with a rake that can produce a sheet with a smooth surface.

"Means for Solving the Problem" According to the present invention, there is provided a rotation control means for controlling the rotation of the rotary shear, and an intersection angle for changing the angle 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 rotates the shear so that the shear drum rotates exactly once when the sheet-like material travels by the set cutting length. control.

On the other hand, the crossing angle control means is configured to be able to change the angle formed by the rotation axis of the shear and the running direction of the sheet material by the rotation of the motor, and rotates the motor in accordance with the change in the set cutting length. The intersection angle is changed by driving.

Because of this structure, even if the set cutting length is shorter than the synchronous length, the rotation 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 constant rotation speed. Since the material is a thin sheet, it can be cut with a relatively good cutting edge, and the angle between the material running direction and the shear rotation axis is automatically changed according to the set cutting length. Sheet material can always be cut at the same angle.

"Embodiment" Fig. 1 shows a control system in an embodiment of the present invention, and Fig. 4 shows a control system in an embodiment of the present invention.
Parts corresponding to those in the figure are given the same reference numerals. Pulses from the encoder 16 generated in response to the traveling of the sheet material 11 are supplied to the rotation control means 31, and pulses from the rotary encoder 9 generated in response to the rotation of the blades of the rotary shear 13 are also rotationally controlled. The set cutting length L0 from the setting device 21 is also input to the rotation control means 31.

The rotation control means 31 is provided with a speed control loop that causes the rotation of the shear to follow the travel of the sheet material 11 at a constant ratio determined by the input set cutting length. That is, in this example, the encoder is multiplied, the output thereof is converted by the frequency-voltage converter 33 into a voltage corresponding to the output pulse frequency of the multiplier 32, and the converted voltage is input to the analog adder 34. be done. On the other hand encoder 19
The /4' rus from is converted by the frequency-voltage converter 35 into a voltage corresponding to the /l russ frequency, 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 taken, and the motor 4 is controlled by the output of the analog adder 34 through a speed amplifier 36. As a result,
The motor 4 is controlled to follow the basic speed of the frequency-voltage converter 33.

Here, the multiplier 32 will be briefly described. Currently set cutting length L
When is equal to the synchronous length L, the multiplier of the multiplier 32 required to make the rotational speed of the blade OS of the shear 13 match the traveling speed of the material 11 is defined as m. If the set cutting length is the synchronous length and the width is small (Lo<L), in order for the blade of the shear 13 to rotate exactly once when the material 11 moves by L, the traveling speed of the material 11 must be Become. In this way the cutting length is set to a synchronous length.

If the length is too short, the rotational speed of the blade of the rotary shear 13 is increased accordingly, and when the material 11 moves by the set cutting length L0, speed control is performed such that the blade of the rotary shear 13 rotates exactly once. However, as mentioned above, if the speed is slower than the synchronous length, the cutting margin will be poor, so if the set cutting length L0 is longer than the synchronous length (L0≧L3), the multiplier of the multiplier 32 is set to 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 control the unit length of the material 11, for example, 0°05.
The rotation angle of the blade of the shear 13 is positioned and controlled for each gourd, and positioning is performed during travel so that the tip of the material is cut with the tip of the shear protruding beyond the blade of the shear by a set cutting length L0. Each time a pulse from the encoder 16 is input, a value G/L0 is added by the digital adder 37, and a value K is subtracted by the digital adder 37 each time a pulse is input from the encoder 19. 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 circumference of the row 215 that contacts the material 11 is 400 mm.
．． 02m, encoder 16°19 is 8 in one rotation each.
00074 rus, and the reduction ratio of the reducer 39 interposed between the motor 14 and the rotary shear 13 is set to 1:2.
4, the material 11 has the set cutting length. When delivered, the pulse generated by the encoder 19 during one rotation of the encoder shear 13 is 8000×2.4. If positioning control is performed correctly, the digital adder 37 may output the signal. G is a parameter that can be called sensitivity and may have any value, but if it is too thick, the weight of 1 nonlus from the encoder becomes large, making control unstable.

The cutting length is set by the setting device 21 in the rotation control means 31 . is input to the divider 41, and the divider 41 divides G/
The calculation of L0 is performed, 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 the speed loop, if the set cutting length L0 is a synchronous length and is longer (Lo≧Ls), the output of the divider 41 is changed to G/
T, fixed at 8. Then, similar to the control in FIG.
Make the speed waveform shown in Figure A. Although a conventional method may be used for this purpose, an example will be described in which a method using the above-mentioned control means used in Lo<Ls is used as is. In the rotation control means 31 that rotates the shear once while traveling by Lo, in this case as well, VL is input from the divider 41.

If it is output, there is no problem. However, because we do not want to reduce the speed below the synchronous speed (the speed when cutting the synchronous length) due to the cut, we set the output of the divider 41 to G/
Since it is fixed at L, all you have to do is subtract that amount. Now set cutting length. When the material 11 travels, the encoder 16 outputs the set cutting length from the setting device 21 in the rotation control means 31. , the synchronization length of the setter 43, and are input to the calculator 44 to calculate the above N.
is added to the adder 37 every time one cutting is completed. This is L
Since this is only the case when 0≧L3, 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, after that, the accumulation of G/L3 becomes effective, so the adder 37 converges to zero, and the shear accelerates accordingly, and cutting begins with the rotation angle of the shear 13 servoing in synchronization with the movement of the material 11. .

Next, in the present 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 changed depending on the set cutting length. The necessity of this will be discussed below. When the rotating drum of the rotary shear 13 with a rake is unfolded, the cutting edge becomes a slightly inclined diagonal line 9 as shown in Fig. 3A, as described above, and on the drum, as shown in Fig. 3B. It has a spiral shape. The rake is 1114. In this way, 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 θ0 (FIG. 3C) is. In addition, as shown in FIG. 3B, the rotating shaft of the rotating drum is slightly inclined with respect to the running direction of the sheet material 11, and the cutting edge contacts the material 11 at a point P on one side edge, causing the rotating drum to rotate. As the cutting progresses, the material 11 is cut in the width direction, and the cutting of the material 1 is completed at the other side edge P2 of the material 11. When the material is to be cut at a cutting angle H (the angle between the side edge of the material and the cutting line) in the third drawing, that is, when the material is to be cut at a closed angle, the rotating drum shaft is installed at P1P2.

Next, find the length λ of the lower pan. As mentioned earlier, in this invention, the set cutting length. If is shorter than the synchronization length L8, then the apparent synchronization length is calculated. to control rotation. In other words, it's all about the materials. As it advances, the drum rotates once at a nearly constant speed. Therefore, the length of material λ that advances during the cutting angle θ
It's dechiru. That is, λ must be changed in accordance with the change in L.

Therefore, in the present invention, when the set cutting length is 9 times shorter than the synchronous length Ls, the angle between the rotary shaft of the rotary shear and the material traveling angle is changed in accordance with the set cutting length L0. As shown in FIG. 1, the cutting length is set by the setting device 21. is input to the arithmetic unit 71, and λ is calculated. The encoder 72 is driven by the rotation of the motor 63, and the A? A digital adder 74 calculates the difference between this counted value and the calculation result of the calculator 71.
and the output of the digital adder 74 is sent to the DA converter 7.
5 to convert it to an analog signal. The pulses of the encoder 72 are supplied to the frequency-voltage converter 76 to obtain a voltage corresponding to the rotational speed of the motor 63, and the difference between this and the output of the DA converter 75 is taken by the analog adder 77, and the output is Motor 63 is driven through speed amplifier 781. In other words, the rotation of the motor 63 controls the angle of the axis of the rotary drum 56, that is, the rotary shear 13, with respect to the material running direction, and a value corresponding to the angle is obtained as the count value of the counter 73, and this and the calculation of the calculator 71 If there is a difference between the results, 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. Please note that the cutting length is set. is longer than the synchronization length Ls, the arithmetic unit 71 outputs a fixed value t. In this case, the enneader 72 may be an absolute instead of an incremental one, and a code reader may be used instead of the counter 73. For example, as shown in FIG. 2, the rotary shear 13 is provided with fixing bases 51 and 52 facing each other, sandwiching the material 11 in the width direction, and these fixing bases 51.
The rotary shear 13 is held for 52 hours. Supports 53 and 54 are disposed facing each other on fixed bases 51 and 52, and a fixed lower blade 55 is mounted between the supports 53 and 54. Further, a rotating drum 56 is rotatably held between 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 body 54 is configured to be able to rotate slightly around a pivot 59.

On the other hand, one end of the ball screw 62 is rotatably connected to the support body 53, and the other end is connected to the rotating shaft of a motor 63 on the fixed base 51. 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 the lower blade 55 and the rotating drum 5.
6, and the lower blade 5 is inserted through the rotation of the ram 56.
5 and the upper blade 57.

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, and for example, in FIG. The functions of the divider 41, the arithmetic unit 44.71, and the counter 73 may be configured to be processed by an electronic computer. Furthermore, in the above, the setting cutting length. Cutting is possible not only when the cut length is shorter than the synchronization length L3, but also when it is longer, but if it is used only when the set cut length is shorter than the synchronization length, it may be possible to simplify it by omitting the arithmetic unit 44, for example. can.

``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 running speed, for example,
Even if the cutting length is short as shown in Figure B, it is possible to cut the material at a maximum speed of 24 ohms/distribution.

However, with only this rotation control, as long as the shear is equipped with a rake, the cutting angle of the material, that is, the four corners of the quadrilateral, will change depending on the cutting length. Since the intersection angle between the rotating shaft 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 the drawing]

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, FIG. 2 is a perspective view showing an example of the mechanism of the present invention, and FIG. 3A is a state in which the rotary drum of the rotary shear is unfolded. Figure 3B is a perspective view of the same shear β dam, Figure 3C is a diagram showing the rotation angle of the drum necessary for cutting, Figure 3 is a diagram showing the angle between the rotary shear and the material, FIG. 4 is a block diagram showing a conventional rotary shear control device, and FIG. 5 is a diagram showing an example of a change in rotational speed of the rotary shear over time in the control device shown in FIG.
FIG. 6 is a diagram showing an example of the relationship between the set cutting length and the cutting speed of the material that can be cut.
Figure B shows the case of the shear of the present invention.

Claims (1)

[Claims] (1) In a rotary shear with a rake that cuts the traveling sheet-like material intersecting the traveling direction, the rotation of the shear follows the traveling of the sheet-like material at a constant ratio determined by the set cutting length, and a rotation control means for controlling the rotation of the shear so that the shear rotates once when the sheet-like material travels by the set cutting length, and an angle between the rotational axis of the shear and the running direction of the sheet-like material. A rotary shear with a rake, characterized in that the rotary shear is configured to be able to change the cross angle by rotation of a motor, and further comprises cross angle control means for driving the motor to change the cross angle according to the set cutting length.