JPS5937200B2 - Full rotary cutting machine - Google Patents

Description

[Detailed Description of the Invention] Conventionally, a blade mechanism for cutting paper, plastic, and other film-like coils to arbitrary lengths has a fixed blade and a rotating blade.
A plunger solenoid or rotary solenoid is used as the power for the rotary blade, and without rotating the rotary blade once, it rotates back and forth only by a certain angle necessary for cutting work, cutting the coil in the forward rotation and moving the rotary blade to the starting position in the backward rotation. It was a mechanism to restore the coil to its original state and secure a passage for the coil.

The disadvantage of this mechanism is that when the feed speed is slow, it is possible to cut well without any problems, but when cutting paper equivalent to printing paper at the operating speed of a commonly available plunger or rotary solenoid, it can be cut without any accidents. Maximum paper feed speed is 3
up to m/mn. At higher feed speeds, the first to third
As shown in the figure, it becomes impossible to cut. FIG. 1 shows a state in which the rotary blade 1 is in the starting position and there is a suitable path gap between the fixed blades 2 for the paper 3 traveling in the direction of the arrow. FIG. 3 shows a state in which the solenoid is activated, the rotary blade rotates forward at a certain angle, completes cutting the paper, and reaches the end of rotation. Since the paper 3 moves forward in the direction of the arrow at a constant speed even after cutting is completed, the paper 3 rides on top of the rotary blade 1 while the rotary blade rotates back in the direction of the arrow, and the rotary blade returns as shown in Figure 2. When the rotation is completed and the paper 3 is restored to the starting position, the paper 3 passes over the rotary blade, and the next cutting becomes impossible. In addition, in this cutting mechanism, the rotary blade 1 and the fixed blade 2 rub against each other twice during one cutting operation, so they wear out in a short period of time. The present invention eliminates the above-mentioned drawbacks, the rotary blade rotates fully in the same direction as when cutting, does not impede paper feeding, and the rotary blade and fixed blade rub only once in each cutting, reducing the amount of wear. After cutting is completed, the rotary blade stops at a starting position that does not interfere with paper feeding, making it possible to feed and cut paper at high speed. Furthermore, in the present invention, the paper cutting point is limited from the position of the starting point, and the maximum rotation angle of the return torque generated from the return spring of the rotary blade is made to coincide with the time of cutting the paper at a position rotated more than 180 degrees from the starting point, and the electromagnetic This is a device that reduces the output of the clutch and the torque of the motor for rotating the power shaft to obtain cutting characteristics with light weight, small size, and low power consumption.

Examples of the present invention will be described below.

FIG. 4 is a front view of the apparatus of the present invention, and FIG. 5 shows the relationship among the rotary blade, fixed blade, and paper at the time of startup.

The rotary blade 1 is supported by bearings 4 and 5, and has a pin 6 at the left shaft end at a position eccentric to the rotation axis of the rotary blade 1. A helical spring 8 whose one end is fixed to the base 7 is attached to the pin 6 and is pulled toward the base. The pin 6 is installed so that when the helical spring is compressed to its shortest length, the rotating blade 1 stops at a starting point where the paper 3 can pass sufficiently between the fixed blade 2 and the fixed blade 2, as shown in FIG. The strength of the spring 8 is necessary and sufficient to restore the rotary blade to the starting point position from any rotation angle when the rotary blade is in an unloaded state. A flange coupling 9 made of a soft magnetic material is fixed to the right shaft end of the rotary blade 1. The right side of the coupling ring 9 is provided with a suitable roughening process or a friction plate for torque transmission by friction. On the left side of the coupling ring 9 is a slip ring 10.
Attach. The conductive band 11 of the slip ring 10 is insulated from other features carried on the slip ring 10 which are made of non-conductive material. The conductive band 11 is not placed around the entire circumferential surface of the slip ring, but is placed only between the corners where power is to be transmitted from the power shaft 14 by the electromagnetic clutch 20. This angle is 1800 degrees from the starting point of rotary blade 1.
This includes the rotation angle until the paper cutting is completed. Two plastics 12 are in contact with the slip ring 10, and at the starting point they are in contact with the starting end on the conductive band 11 of the slip ring 10, so that the two plastics 12 are electrically connected. This circuit is connected to an operating circuit for the electromagnetic coil 20, which will be explained later. When the slip ring 10 rotates simultaneously with the rotary blade 1 until the paper cutting is completed, the slip ring 1
This circuit is cut because it touches the non-conductor part of 0. Opposed to the coupling ring 9 is a power shaft 14 having a flange coupling 13 made of a soft magnetic material with a friction plate or a friction plate on the end face.
is fixed to the power shaft 14 in the rotational direction, and is attached so that it can freely slide over a certain distance in the axial direction. Further, a helical spring 15 having a tensile force is installed in the center of the coupling 9 and the coupling 13, and the coupling 13 is separated from the coupling 9. A belt sheave 16 is fixed to the right end surface of the power shaft 14, and is always rotated in one direction by a belt 17. The rotational axis of the power shaft 14 is held by a bearing 18 so as to be aligned with the rotational axis of the rotary blade 1. The outer peripheries of the coupling rings 9 and 13 are aligned with the inner diameter of the electromagnetic coil 19 fixed to the base plate 7. The electromagnetic coil 19 and the coupling rings 9, 13 are loosely fitted and constitute an electromagnetic clutch 20 capable of transmitting the power necessary for cutting paper. 6-7 show electromagnetic clutch operating circuit diagrams. FIG. 6 shows the command circuit, and FIG. 7 shows the main circuit. At the starting point, the conductive band 11 and brush 12 of the main circuit are connected. All other switches are set to ``off.'' At the start of cutting, command switch L1 is turned on, time switch Tm is turned on, electromagnetic switch X1 is turned on, and command switch L1 is immediately turned off, but electromagnetic switch X1 is held by the time switch circuit.
The main circuit electromagnetic switch X2 and the magnetic clutch electromagnetic coil 19 are excited to form the main circuit. After the main circuit configuration is completed, the time switch Tm is turned off, the command circuit returns to the starting state, and the electromagnetic switch X1 is turned off in the main circuit.
Next, create a circuit using electromagnetic switch X2. When the slip ring 10 rotates and the conductive band 11 and plastics 12 are turned off, the electromagnetic switch X2 is turned off. Thereafter, the return spring returns the slip ring 10 to the starting point, the conductive band 11 and the plastic plug 12 are turned on, and the main circuit is restored to the state at the time of starting, waiting for the next disconnection command. Figures 8 to 11 show how the various parts of this cutting machine work together. The left end of each figure is the operating status of the return spring 8, the right side is the rotary blade 1,
The cutting operation of the fixed blade 2 and the paper 3 is shown on the right, with the circumferential surface of the slip ring 10 developed in a plane, and the relative positions of the conductive band 11 and the plastic 12 are shown. The right end shows the operating conditions of the coupling rings 9, 13 and the spring 15. FIG. 8 shows the situation in the starting position. The two plastics 12 are in contact with the conductive band 11 and conductive, but since the electromagnetic switch is not transmitted. Rotary blade 1 is pulled by spring 8 and fixed blade 2
The paper 3 is held with a sufficient passage gap between the paper 3 and the paper 3. FIG. 9 shows a state in which the electromagnetic switch X2 is turned on. The brush 12 passes through the conductive band 11, excites the electromagnetic coil 19, attracts the coupling 13 to the coupling 9, and starts transmitting power to the rotary blade 1 in the direction of the arrow.
The coupling ring 13 rotates over 1800 degrees from the starting point while stretching the return spring 8. FIG. 10 shows the state immediately before the conductive band 11 is separated from the plastic 12 after paper cutting is completed.
The rotary blade 1 continues to be driven by the electromagnetic clutch 20 from the starting point until the conductive band 11 is separated from the plastic 12, and even when the electromagnetic clutch 20 is separated and the electromagnetic clutch 20 is opened as shown in FIG. Therefore, the rotation proceeds further and is stopped by the force of the return spring 8 at the position shown in FIG. Thereafter, a similar cycle is performed by a cutting command. This interleaf 3
Since the traveling direction of the paper 3 and the rotating direction of the rotary blade 1 are the same, a cutting accident will not occur until the feeding speed of the paper 3 becomes considerably higher than the speed of the rotary blade 1. In the example, the paper feed speed was changed from 1 m/Mn to 13 m/Mn with the cutting edge rotation radius of the rotary blade 1 being 1 cTn and the rotation speed of the power shaft 14 being 200 RPM, and cutting was possible without any problems even at 13 m/Mn.
In addition, the cutting life of the blade is 300,000 cuts, which is a vast improvement over the 180,000 cutting life of conventional reciprocating rotary blades. The no-load torque of the device is TOkg, and the torque required for paper cutting is T.
It is assumed that 8l<g1, the torque by the return spring 8 is Tθ, and its maximum torque is TOm. Further, if the torque to be transmitted by the electromagnetic clutch is TWl, and the maximum torque is Twm, the following relationship holds true. If the paper cutting position is within a range of 1800 degrees from the starting point, both the latch and the power motor will need to be large.

When the paper cutting position is between 180 degrees and 360 degrees from the starting point, in order to minimize the maximum transmission torque Twm in the rotation angle range of 180 degrees to 3601 degrees, the position is Tθ=TOm.

In this case, that is, if the paper cutting position is between 180θ and 360 degrees from the starting point, the transmitted torque is between 00 and 1
At rotations up to 80°, in addition to the no-load torque TO of the cutting device, there is a torque Tθ in the opposite direction to the torque transmitted by the return device.
On the other hand, after 180 tons, the torque Tθ caused by the return device becomes in the same direction as the transmitted torque, so the transmitted torque Tθ is returned from the sum of the no-load torque TO and the paper cutting torque Ts. This means that the torque Tθ caused by the device only needs to be smaller.

In the return device using the return spring 8 in the above embodiment, the return torque has opposite directions and symmetrical torque characteristics in the ranges of 0 return to 1800 and 180 to 360 return. Return torque Tθ within the range of
The load will be reduced within the range of 180 to 360 tons by the amount that becomes the load. In order to minimize the transmitted torque, it is sufficient that the Twm between the rotary blades 0 and 1800 and the Twm in the rotation angle range of 180 and 360 rotations are the same. That is, TOm=%Ts above 0-180
Maximum transmission torque Twm when cutting at a rotation angle of O = T
Maximum transmission torque Twm=TO+%Ts when cutting at a rotation angle of 180 to 360 m than O+Ts+TOm
It can be seen that it is quite small.

In other words, the position where the torque from the return device in the rotating direction of the rotary blade is maximum is the cutting position of the rotary blade, and the tension of the return spring is set so that the torque from the return device at that position is % of the paper cutting torque. Just adjust it.

The actual measurement value in the above example is idling torque To=0.4
kg 1, the cutting torque Ts = 8.4 kg-, the maximum return torque angle is 1000 and 260°, and the maximum return torque T0m
= 4.2 kg per unit, and the required transmission torque of the electromagnetic clutch was measured by changing the cutting position angle of the rotary blade. As a result, the results shown in Table 1 were obtained.

As shown in Table 1, when the cutting position of the rotary blade coincides with the rotation angle of 260° at which the torque of the return spring is maximum, the required maximum transmission torque of the electromagnetic clutch becomes the minimum. Next, we measured the maximum torque angle of the return spring and the required maximum torque of the electromagnetic clutch when paper was cut with the same device by adjusting the cutting rotation angle of the rotary blade to 260° and changing the maximum torque of the return spring. Shown in Table 2.

As shown in Table 2, maximum return spring torque T0m=%
The case of T8=4.2 kg-c minimizes the required maximum torque of the electromagnetic clutch. In the present invention, the type of electromagnetic clutch, its operating circuit, the type of return spiral spring, the arrangement of each component, etc. do not necessarily have to be as in the embodiments.

As long as it does not interfere with the function of the device of the present invention, a commercially available electromagnetic friction clutch, powder electromagnetic clutch, or other electromagnetic clutch may be used as the electromagnetic clutch, and the position of the rotating blade can be detected without using a slip ring or a time switch. Alternatively, the electromagnetic clutch may be operated by specifying the rotational position using a handshake. Also, the power shaft may be directly connected to the motor. As described above, in the device of the present invention, the spring-based return device deforms the spring of the return device in the first half of one rotation of the rotary blade, and releases the deformation of the spring in the second half, which is necessary for paper cutting. As a structure that reduces large torque, the transmitted torque can be minimized, so that the electromagnetic clutch and rotation motor can be made smaller and the power consumption can be reduced.

[Brief explanation of drawings]

Figures 1 to 3 are operational relationship diagrams of a conventional cutting machine, Figure 4 is a front view of an embodiment of the present invention, Figure 5 is a relationship diagram at the time of startup, Figures 6 to 7 are operating circuit diagrams, 8 to 11 are operation explanatory diagrams. 1: Rotating blade, 2: Fixed blade, 3: Paper, 6: Pin, 7: Base, 8: Spring, 9: Coupling, 10: Slip ring, 11: Conductive band, 12: Plastic, 14: Power shaft, 15
: Spring, 19: Electromagnetic coil, 20: Electromagnetic clutch, L1
: Command switch, Tm: Time switch, X1: Electromagnetic switch, X2: Electromagnetic switch.

Claims (1)

[Scope of Claims] 1. In a cutting machine that cuts a film-like coil passing between a fixed blade and a rotary blade to a desired length, a magnetic clutch is connected as appropriate from a power shaft that always rotates in one direction to a drive device that rotates the rotary blade from a starting position; a switch that disconnects the coil and releases the magnetic clutch at a certain rotational position after rotating more than 180 degrees from the starting position; and a return device that applies load torque fluctuations to the shaft by a structure that continuously deforms a spring as it rotates, and the magnet is set at a position where the spring deformation is minimum in the return device as the starting position of the rotary blade. A fully rotary cutting machine characterized in that even after the clutch is released, the rotary blade is fully rotated in the same direction as the cutting rotation direction by a return device to return to the starting position and stop, thereby cutting the high-speed traveling coil. 2 The return device has a structure in which a pin that rotates eccentrically with respect to the axis of the rotary blade and a fixed base are connected by a tension spring, and the position where the torque from the return device in the rotational direction of the rotary blade is maximum is the position of the rotary blade. 2. The fully rotary cutting machine according to claim 1, wherein the cutting position is set to , and the torque applied to the rotary blade by the return device at this time is set to approximately 1/2 of the torque required for cutting the coil.