JP2000254892A - Cutting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve cutting efficiency easily through simple constitution without any trouble. SOLUTION: This device presses paper sheets cut by driving a sheet press plate 3 through drive of a hydraulic cylinder 8 and the pressed paper sheets are cut by driving a cutting blade through drive of a hydraulic cylinder 9. In this case, this cutting device is provided with a timer 12 to output after a lapse of a time which starts from the starting of drive of a hydraulic cylinder 8 and is set with an object being thin in thickness of paper sheets to be precut; and a thickness detecting circuit 13 to detect and output a stop of a sheet press plate 3 from a stop of a pulse from a pulse generator 10 to generate a pulse during movement of the sheet press plate 3. Drive of a hydraulic cylinder 9 is started by one, being more rapid, of the output of the timer 12 and the output of the detecting circuit 13, and a time required for a cutting process is shortened regardless of the thickness of paper sheets to be cut.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cutting device.

[0002]

2. Description of the Related Art A cutting table used for trimming sheets to a predetermined size or trimming edges of a bound sheet bundle is, for example, shown in FIG. 2 and the sheet 1 so that the sheet 1 does not shift at the time of cutting.
And a cutting blade 4 for cutting the paper pressed by the paper pressing plate 3.

The paper holding plate 3 is connected to a tension spring 5 via a chain 6 and to a piston rod 8 a of a single-acting hydraulic cylinder 8. The paper pressing plate 3 is normally held at a position above the mounting table 2 by the spring force of the tension spring 5, and the piston rod 8 a of the hydraulic cylinder 8 is driven at the time of cutting to descend against the spring force of the tension spring 5, and Table 2
The upper sheet 1 is pressed and tightened. After the cutting, the spring returns to the position above the mounting table 2 by the spring force of the tension spring 5. Reference numeral 7 denotes a sprocket for guiding the chain 6.

The cutting blade 4 is connected to a piston rod 9a of a double-acting hydraulic cylinder 9 and is normally held at a position above the mounting table 2 by the hydraulic cylinder 9, and the piston rod 9a of the hydraulic cylinder 9 is driven downward during cutting. The paper 1 on the mounting table 2 is cut. After the cutting, the piston rod 9a of the hydraulic cylinder 9 is driven up and returned to and held at a position above the mounting table 2.

[0005] The cutting apparatus thus constructed is provided with a control device for generating a signal for driving each of the hydraulic cylinder 8 for driving the paper holding plate 3 and the hydraulic cylinder 9 for driving the cutting blade 4. This control device is provided with a timer for setting the time between the driving of the hydraulic cylinder 8 and the driving of the hydraulic cylinder 9. That is, the driving of the cutting blade 4 is started later than the driving of the paper pressing plate 3 for the time set by the timer, and the cutting is performed while the paper 1 is securely pressed by the paper pressing plate 3. 4 to 6 show this operation. FIG. 4 shows a state in which both the sheet pressing plate 3 and the cutting blade 4 are in the waiting position above the mounting table 2, and FIG. FIG. 6 shows a state immediately after the sheet 1 is pressed, and FIG. 6 shows a state in which the cutting blade 4 is driven and cut while the sheet pressing plate 3 presses the sheet 1.

[0006]

By the way, the time set in this timer is such that the cutting by the cutting blade 4 is performed by the sheet pressing plate 3.
In general, in order to avoid preceding (pressing the sheet before pressing) the sheet 1 by pressing, the thickness of the sheet to be cut is usually thinnest (in this case, the time required for the sheet pressing plate 3 to reach the sheet is the shortest). The time is taken into consideration, i.e., the time from the start of driving of the paper press plate 3 to almost immediately before reaching the paper (the position where the cutting blade 4 does not reliably lead the paper press plate 3).

However, in such a setting, if the thickness of the sheet to be cut is large, the time from when the sheet pressing plate 3 is driven to when it reaches the sheet is shortened. There is a problem that the cutting processing efficiency is inferior because it is delayed after a certain time from the start of driving of the plate 3 and is delayed. In order to eliminate the delay in the drive start of the cutting blade 4, it is sufficient to change the time set in the timer in accordance with the thickness of the sheet to be cut. However, it takes time and effort to change the time. However, there is a problem that the cutting efficiency is further deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and has as its object to provide a cutting apparatus that can easily increase the cutting processing efficiency with a simple configuration and without any trouble.

[0009]

According to a first aspect of the present invention, there is provided a first driving unit for driving a sheet pressing plate, a second driving unit for driving a cutting blade, and a first driving unit for driving the cutting blade. And a control device for driving the second driving means after the driving, the cutting device is configured to press the sheet positioned on the mounting table with the sheet pressing plate and cut with the cutting blade,
The control device includes a timer that outputs a predetermined time after the start of driving of the first driving unit and a detection unit that detects and outputs the thickness of the sheet to be cut, and outputs the timer and the detection unit. The driving of the second driving means is started by the earlier output of the above.

According to a second aspect of the present invention, the detecting means for detecting the thickness of the sheet to be cut according to the first aspect of the present invention is detected by stopping the first driving means after driving. And

According to the present invention, a timer for setting the moving time of the sheet holding plate to a position where the cutting blade does not precede the sheet holding plate regardless of the thickness of the sheet to be cut, and detecting and outputting the thickness of the sheet to be cut. Detection means, the output of the timer from the start of the movement of the paper presser plate or the output of the detection means, whichever is earlier, for example, the output of the timer when the thickness of the paper is thin, and the detection when the thickness is thick, Since the driving of the cutting blade is started by the output of the means, cutting can be performed in the shortest time in a state where the sheet is securely pressed regardless of the thickness of the sheet to be cut.

Further, when the thickness of the sheet to be cut is detected by detecting the stop after the movement of the sheet pressing plate, a thickness gauge or a position detection sensor for the sheet to be cut is omitted, and a simple configuration can be achieved.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a circuit diagram of a control device of the cutting device according to the embodiment of the present invention, FIG. 2 is a timing diagram of the control device of FIG. 1, and FIG. 3 is a schematic configuration diagram of the cutting device according to the embodiment of the present invention. is there. 1 to 3, the same portions are denoted by the same reference numerals.

Since the schematic configuration of the cutting apparatus shown in FIG. 3 has been described above, its description is omitted here, but reference numeral 10 in FIG. 3 denotes a pulse generator that generates a pulse by rotation of the sprocket 7. That is, when the piston rod 8a of the hydraulic cylinder 8 is driven and the paper presser plate 3 descends, the chain 6 moves, the sprocket 7 meshing with the chain 6 rotates, and the rotation is transmitted to the pulse generator 10. Generates a number of pulses at predetermined intervals.

In FIG. 1, reference numeral 11 denotes a cutting start switch,
12 is a timer, 13 is a circuit for detecting the thickness of the sheet to be cut,
14 is an OR circuit, 15 is an electromagnetic valve for switching and controlling the hydraulic pressure of a hydraulic cylinder 8 (first driving means) for driving the paper holding plate 3, and 16 is a hydraulic cylinder 9 for driving the cutting blade 4.
This is an electromagnetic valve that controls switching of the hydraulic pressure of (second driving means).

The timer 12 sets the time required for the cutting blade 4 to reach the lowering position (hereinafter, referred to as a predetermined position) of the sheet pressing plate 3 which does not precede the sheet pressing plate 3. Operates by turning on and outputs a signal after the set time elapses. The sheet thickness detection circuit 13 for cutting receives the output pulse of the pulse generator 10, and when the output pulse stops, determines that the sheet presser plate 3 has reached the sheet to be cut and outputs a signal. OR circuit 14
Receives the output of the timer 12 and the output of the sheet thickness detection circuit 13 and outputs to the electromagnetic valve 16 when either one or both of the outputs are input.

The control device having the above-described configuration includes the mounting table 2
When the positioning of the sheet 1 to be cut upward is completed and the cutting start switch 11 is turned on, the electromagnetic valve 15 is switched and the hydraulic pressure is supplied to the hydraulic cylinder 8. By this supply, the piston rod 8a is pushed out, and the paper pressing plate 3 connected to the tip thereof descends toward the paper 1 and eventually the paper 1
And presses the sheet 1 against the mounting table 2 to maintain the state.

When the paper presser plate 3 moves, the pulse generator 10 generates a pulse P as shown in FIG.
0 is generated, and the pulse is input to the thickness detection circuit 13. When the sheet pressing plate 3 reaches the sheet 1, the sheet pressing plate 3 is almost stopped, and the pulse P0 from the pulse generator 10 is stopped. At this time, the thickness detection circuit 13
The signal P2 is output as shown in FIG. On the other hand, when the cutting start switch 11 is turned on, the timer 12 is operated, and when the set time T1 elapses as shown in FIG.
2 outputs a signal P1.

If the thickness of the sheet 1 to be cut is large and the uppermost surface of the sheet 1 is located above a predetermined position (a position close to the sheet pressing plate 3 during a waiting period), the cutting start switch 11 is turned on. Accordingly, as shown in FIG. 2B, the pulse P0 from the pulse generator 10 stops after the time T2, and the output P2 from the thickness detection circuit 13 after the time T2. In this case, the distance until the paper pressing plate 3 reaches the paper 1 is shorter than the distance to the predetermined position.
Is shorter than the set time T1 of the timer 12, the output P2 from the thickness detection circuit 13 is output earlier than the output P1 from the timer 12, and the electromagnetic valve 16
3 is switched by the output P2. By this switching, the hydraulic pressure is supplied to one cylinder chamber partitioned by the piston of the hydraulic cylinder 9, and the oil in the other cylinder chamber is discharged. The supply of the hydraulic pressure pushes out the piston rod 9a, and the cutting blade 4 connected to the tip of the piston rod 9a descends toward the sheet 1 to cut the sheet 1.

If the thickness of the sheet 1 to be cut is thin and the uppermost surface of the sheet 1 is located below a predetermined position (a position away from the sheet pressing plate 3 during a waiting period), FIG.
The time T2 during which the pulse P0 from the pulse generator 10 is generated is extended, and the output from the timer 12 is output earlier than the output from the thickness detection circuit 13. In this case, the output from the timer 12 causes 16 is switched, the piston rod 9a is pushed out, and the cutting blade 4 connected to the tip of the piston rod 9 descends toward the sheet 1 to cut the sheet 1. That is, after the cutting start switch 11 is turned on, the driving of the cutting blade 4 is started by the output of the timer 12 or the output of the thickness detection circuit whichever is earlier, and the output of the later is invalidated.

When the sheet 1 is cut, the electromagnetic valves 15 and 16 are switched and the oil in the hydraulic cylinder 8 is discharged. Due to this discharge, the sheet pressing plate 3 returns to the position above the mounting table 2 by the spring force of the tension spring 5, and waits until the next cutting start switch 11 is turned on. The hydraulic cylinder 9 discharges oil in one cylinder chamber partitioned by a piston, and supplies hydraulic pressure to the other cylinder chamber. The supply of the hydraulic pressure causes the piston rod 9a to be retracted, and the cutting connected to the distal end thereof. The blade 4 rises and returns to the position above the mounting table 2, and then waits until there is an output of the timer 12 or an output of the thickness detection circuit. After the sheet 1 is cut, the thickness detection circuit 13 and the timer 12 are reset.

In the above embodiment, the hydraulic pressure cylinder drives the sheet pressing plate 3 and the cutting blade 4, but the driving means of the sheet pressing plate 3 and the cutting blade 4 is not limited to the hydraulic cylinder. Further, the thickness detection is performed by detecting the stop of the thickness of the sheet to be cut after the movement of the sheet pressing plate, but the sheet pressing plate reaches the sheet based on information on the number of sheets to be cut and the measurement result of the thickness. The measurement may be performed by calculating the time, or may be performed by using a position detection sensor such as a photo sensor.

[0023]

As described in detail above, according to the present invention,
Regardless of the thickness of the sheet to be cut, cutting can be performed in the shortest time while the sheet is securely pressed, and cutting processing efficiency can be improved. Further, when the thickness of the sheet to be cut is detected by detecting the stop after the movement of the sheet pressing plate,
The thickness of the sheet to be cut can be easily detected with a simple configuration.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a control device of a cutting apparatus according to an embodiment of the present invention.

FIG. 2 is a timing chart of the control device of FIG. 1;

FIG. 3 is a schematic configuration diagram of a cutting device according to an embodiment of the present invention.

FIG. 4 is a diagram illustrating the operation of the cutting apparatus.

FIG. 5 is a diagram illustrating the operation of the cutting apparatus.

FIG. 6 is a diagram illustrating the operation of the cutting apparatus.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 paper 2 paper mounting table 3 paper holding plate 4 cutting blade 5 tension spring 6 chain 7 sprocket 8 hydraulic cylinder (first driving means) 9 hydraulic cylinder (second driving means) 10 pulse generator 11 cutting start switch 12 timer 13 Paper thickness detection circuit 14 OR circuit 15, 16 Electromagnetic valve

Claims (2)

[Claims] 1. A first driving unit for driving a sheet pressing plate, a second driving unit for driving a cutting blade, and a control device for driving the second driving unit after driving the first driving unit. A cutting device configured to press the sheet positioned on the mounting table with the sheet pressing plate and cut the sheet with the cutting blade, wherein the control device is configured to set a predetermined constant from the start of driving of the first driving unit. A timer that outputs after a period of time and a detecting unit that detects and outputs the thickness of the sheet to be cut, and starts driving the second driving unit by the output of the timer or the output of the detecting unit, whichever is earlier. A cutting device, comprising: 2. The cutting apparatus according to claim 1, wherein the detecting means detects the stop by stopping the first driving means after driving.