JP2578225B2 - Sheet cutting equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a sheet cutting device for automatically and automatically cutting a sheet continuously conveyed by a conveyor.

(Prior Art) Sheets such as cardboard and paper are usually produced continuously on a series of production lines. Therefore, the sheet cutting apparatus is provided with a rotary blade (shear) that cuts in synchronization with the line speed in order to cut the sheet at an accurate size without stopping the operation of the line. The appearance configuration of the prior art and the device of the present invention are not particularly changed. FIG. 1 shows an external configuration diagram of a sheet cutting apparatus, and FIGS. 3 and 4 show configuration diagrams of a conventional typical control device.

 Hereinafter, a conventional technique will be described with reference to these drawings.

As shown in FIGS. 1, 3, and 4, a shear 10 is obliquely attached to the peripheral surface of the shear cylinder 9 so that a running sheet can be cut continuously. A shear PLG5 for measuring the rotational position of the shear 10 in conjunction with the rotation of the shear drive motor 6 for rotating the shear cylinder 9 is provided, and a pulse from the shear PLG5 is output to a shear PLG counter 20.
Is counted. When the line moves, a material position signal (pulse) corresponding to the rotation of the measuring vehicle is sent from the measuring vehicle PLG4 in conjunction with the measuring vehicle, the measuring vehicle PLG counter 18, five preprint counters 29 to 33, and a tip cutting counter 39. To enter the,
Each is counted. Of course, depending on the specifications, the leading edge of the sheet can be neatly trimmed,
There is a case where one or both of the preprint cutting which cuts the sheet aiming at the preprint is not necessary, and five preprint counters 29 to 33 corresponding to the preprint cutting, and latches corresponding to the respective counters are provided. 34 ~
38, one shot 26, quinary counter 27 and decoder 28,
In addition, the tip cutting counter 39 and the latch 40 corresponding to the tip cutting may not be required. The cut completion sensor 1 is mounted near the position where the upper and lower shears 10 mesh with each other, and outputs one pulse each time the shear cylinder 9 rotates to cut the sheet.
~ 33 each latch 34 ~ 38, tip cutting counter 39 latch 4
0, the value of the corresponding counter is latched (held) by the cut completion latch 23 of the measurement vehicle PLG counter 18. Further, the measuring vehicle PLG counter 18 and the shear PLG counter 20 are reset (cleared to 0) in synchronization with the timing immediately after the completion of the latch.

The preprint mark sensor 2 outputs one pulse each time one preprint mark 7 on the sheet is detected, and the pulse is used to latch the value of the measurement vehicle PLG counter 18 by the preprint mark latch 24 of the measurement vehicle PLG counter 18. And
Further, the quinary counter 27, the decoder 28, and the one-shot 26 reset the preprint counters 29 to 33 in order (clear to 0).

The leading edge detection sensor 3 detects the leading edge of the first sheet and outputs one pulse. The leading edge cutting counter 39 is reset (cleared to 0) by the pulse.

The sampling clock gives a sampling period necessary for control, and thereby, the measurement vehicle PLG counter 18
Measurement car PLG counter 1 with sampling clock latch 25
In addition to latching the value of 8, the latch 21 of the shear PLG counter 20 latches the value of the shear PLG counter 20.

On the other hand, the interrupt controller 13 responds to an interrupt request from the cut completion sensor 1, the pre-print mark sensor 2, the leading edge detection sensor 3, and the sampling clock.
An interrupt is issued to U14, and a control operation is performed based on the results of resetting, latching, and the like of the above-described counter to control the shear drive motor 6. The method of calculating the target command value for the shear is disclosed in Japanese Patent Application Laid-Open No. 60-232815, and the description thereof is omitted here.

(Problems to be Solved by the Invention) Conventionally, as described above, the device is composed of a large number of PLG counters and a group of latches that latch their values for each interrupt condition, so that the circuit of the device becomes very complicated. ,
Material costs increase and the cost of the product itself increases. Also, since many counters and latch circuits must be formed on the board, the size of the board becomes large, so that noise,
There is a problem that the number of failures due to poor contact of the wiring and the like increases.

It is an object of the present invention to provide a sheet cutting apparatus which can solve the above-mentioned conventional problems.

(Means for Solving the Problems) For this reason, the present invention relates to a sheet cutting apparatus for cutting a sheet continuously conveyed by a conveyor to a predetermined length or a mark printed on the sheet in advance. A pair of shears for cutting, a shear PLG that measures the rotational position of the shear, a cut completion sensor, a measurement vehicle and a measurement vehicle PLG that detect the position and speed of the sheet, a preprint mark sensor that detects marks on the sheet, and a sheet A tip detection sensor that detects the tip of the sensor, a control device that performs control and calculation based on detection signals from each of the sensors, and a drive motor that drives the chassis ring under the control of the control device, cutting completion, preprint mark detection, In addition to using a D-latch that can latch control interrupt factors such as detection of the leading edge and sampling clock, The configuration is such that the counters and latches are kept to the minimum necessary by separating each of the interrupt factors to be input next, and this is a means for solving the above-mentioned problem.

(Operation) According to the present invention, the counter / latch portion of the control device, which has conventionally been composed of eight sets of counters and ten sets of latches, can be realized with only three sets of counter / latches, and the scale of the control device is very large. Simplified.

(Examples) Hereinafter, representative examples of the present invention will be described with reference to the drawings.

The arrangement of the various sensors and the PLG of the sheet cutting device is as shown in FIG. 1, and there is no particular difference from the conventional device.

FIG. 2 shows a configuration diagram of a control device according to one embodiment of the present invention. In the figure, 1 is a cut completion sensor, 2 is a preprint mark sensor, 3 is a leading end detection sensor, 4 is a measuring vehicle PLG, 5 is a shear PLG, 6 is a shear driving motor, 11 is a D latch, and 12 is a R / L S flip-flop, 13 is an interrupt controller, 14 is a CPU, 15 is an R / S flip-flop, 16 is a preprint / leading PLG counter, 17 is a preprint /
Latch of the tip PLG counter 16, 18 is a measuring car PLG counter,
19 is a latch of the measuring vehicle PLG counter 18, 20 is a shear PLG counter, 21 is a latch of the shear PLG counter 20, and 22 is a motor control output D / A.

The four interrupt factors of cut completion, preprint mark, leading edge detection, and sampling clock are input to a D latch 11 which can collectively latch them.

Now, when one interrupt factor is generated and input to the D-latch 11, the corresponding flip-flop of the R / S flip-flop 12 for storing an event (factor) is set at the rising edge thereof and input to the interrupt controller 13. Then, the CPU 14 is interrupted.

On the other hand, the R / S flip-flop 15 for closing the event (factor) is set, the D latch 11 is collectively latched, and the interrupt factor generated later and the inside of the circuit are logically disconnected by the D latch 11. Actually, only the first factor is accepted inside the circuit, and the later factor is not allowed to enter the inside of the D latch 11 from the entrance. This state is for the CPU 14 to release the event (factor) closure. It is held for a period until the pulse is completed. However, there is a gate delay before the D-latch 11 is collectively latched, and the interrupt factor that occurred in a very short time and a plurality of factors that occurred at the same time are latched as they are without being separated and enter the inside of the circuit. In such a situation, if the interrupt request register of the interrupt controller 13 is monitored during the interrupt processing routine, an accurate processing routine can be devised, Even if the lower-level interrupt factor disappears due to the pulse, control can be continued without any trouble.

Pre-print / tip PLG counter 16 and its latch 17
Provides usability exceeding the circuit shown in FIG. 4 with a little software support.

First of all, preprint cutting and tip cutting are exclusive, so they cannot both occur at the same time, and the two types can be shared by a set of counter latches.

Also, if an interrupt factor from the preprint mark sensor 2 is never generated, the preprint / leading edge PLG counter 16 and its latch 17 operate in exactly the same manner as the conventional leading edge cutting counter 39 and its latch 40. The conventional control algorithm can be applied as it is. Next, if an interruption factor from the leading edge detection sensor 3 is made to never occur, the preprint / leading PLG counter 16 and its latch 17 are replaced with the conventional five preprint counters.
It provides a function equivalent to or higher than the operation of the latches 29-33 and their latches 34-38.

 This will be described in detail below.

In the memory (RAM) of the CPU 14, a buffer of n preprint mark counters and a pointer indicating the buffer are provided. When n = 5, the function is equivalent to that of the conventional circuit.
If n> 5, a buffer that could not be obtained conventionally can be secured. Each time the preprint mark sensor 2 detects a mark, it clears the contents of the buffer of the pointer that is currently pointing, and adds the counter value latched in the latch 17 of the preprint / tip cutting PLG counter 16 to the other buffers. ,
Advances the pointer by one. The value of the pointer ranges from 0 to (n-
1) or n endless (or similar) from 1 to n.

When the cut completion sensor 1 detects the cut completion,
The counter value latched in the latch 17 of the pre-print / tip-cut PLG counter 16 is added to all the buffers, and the pointer is not advanced. The distance to the mark 7 is stored. Measurement vehicle PLG counter 18
Has the same function as the conventional one, but the latch 19 of the measuring car PLG counter has three conventional latches (the cut-off latch 23 of the measuring car PLG counter, the preprint mark latch 24 of the measuring car PLG counter, and the measuring car PLG counter Of the sampling clock latch 25) can be played by one. The shear PLG 20 and its latch 21 are the same as in the conventional system.

(Effects of the Invention) As described above in detail, according to the present invention, the counter / latch portion (pre-print mark cutting and tip cutting) of the control device, which conventionally has 8 sets of counters and 10 sets of latches. ) Can be realized with a configuration of only three sets of counters and latches, greatly simplifying the scale of the control device and improving the reliability. Further, since the number of parts constituting the apparatus is reduced, the material cost is reduced, and finally the cost of the product can be reduced.

[Brief description of the drawings]

FIG. 1 is an external view of a sheet cutting apparatus, FIG. 2 is a view of a control apparatus according to a typical embodiment of the present invention, FIG. 3 is a view of a conventional control apparatus, and FIG. FIG. 2 is a partial detailed configuration diagram of the device. Description of main parts in the drawing 1... Cut completion sensor 2... Preprint mark sensor 3... Tip detection sensor 4... Measuring vehicle PLG 5... Shear PLG 6... Shear drive motor 7. … Control device 9… Shear cylinder 10… Shear 11… D latch 12… R / S flip-flop (for event storage) 13… Interrupt controller 14… CPU 15… R / S flip-flop (event head) 16) Pre-print / tip cutting counter 17 ... Pre-print / tip cutting counter latch 18 ... Measurement car PLG counter 19 ... Latch of measurement car PLG counter 20 ... Sher PLG counter 21 ... Sher PLG Counter latch 22: D / A for motor control output

Claims (1)

(57) [Claims] In a sheet cutting apparatus for cutting a sheet continuously conveyed by a conveyor to a predetermined length or a mark printed on the sheet in advance, a pair of sheet cutting shears and rotation of the shears are provided. A shear PLG for measuring the position, a cut completion sensor, a measuring vehicle and a measuring vehicle PLG for detecting the position and speed of the sheet, a preprint mark sensor for detecting a mark on the sheet, a leading edge detection sensor for detecting a leading edge of the sheet, A control device that performs control and calculation based on detection signals from each sensor, and a drive motor that drives the shear cylinder controlled by the control device,
Using a D-latch that can collectively latch control interrupt factors such as cut completion, preprint mark detection, leading edge detection, and sampling clock, and separating each of the sequentially input interrupt factors, a counter and latch A sheet cutting device characterized by minimizing the number of sheets.