KR840001502B1 - How to control the copy position in the cylinder axis direction - Google Patents

Abstract

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Description

How to control the copy position in the cylinder axis direction

1 is a schematic diagram of a copier to which a control method according to the present invention is applied.

2 is a block diagram of a masking circuit illustrated in FIG.

3A and 3B illustrate an original printed on an image cylinder and an engraving document mounted on a digitizer table.

4A and 4B are developed views of main portions of the recording cylinder and the image cylinder.

5 is a graph showing the moving speeds of the pickup and recording head.

6 is a block diagram of one embodiment of the position controller illustrated in FIG.

7 is a block diagram of another embodiment of the position controller illustrated in FIG.

FIG. 8 is a block diagram of one embodiment of a queue control circuit illustrated in FIG.

9 is a time-chart of the pulse signal of FIG.

The present invention relates to a method for axially controlling the copying position on a recording film installed on a recording cylinder for use in a copier such as a color syringe or color facsimile.

When a large number of originals installed in an image cylinder are scanned by a pickup head to obtain an image signal, a copy having various copy ratios is installed in the recording cylinder at a predetermined arrangement position by using the image signal according to a predetermined trimming of the image by the recording head. Copiers such as color syringes that are accurately recorded on recording films have not yet been developed. One of the reasons is that the radiation position on the recording film cannot be controlled in the axial direction of the recording cylinder.

In the conventional image scanning and recording apparatus, for example, the moving speed of the recording head is fixed in the recording cylinder axial direction, but the moving speed of the pickup head in the same direction varies with the radiation magnification while the image is photoelectrically scanned. To change the radiation magnification. However, in this embodiment, the response time to the voltage supplied to the motor for driving the pickup head is unstable (i.e., the time at which the motor reaches the speed corresponding to the supplied voltage after the supply voltage is changed is determined before supply). Depending on the voltage, the difference between the voltage after supply, and the like), there is a drawback that the starting point of the radiation in the recording cylinder axial direction is shifted by several scan lines.

The object of the present invention is to avoid the above-mentioned drawbacks and to accurately position the copying on the recording film, and to control the copying position in the cylinder axial direction on the recording film installed in the recording cylinder for use in a stable and reliable copier. To provide a way.

The present invention provides a method for detecting a distance between a recording start point of each copy and a pickup head and a recording head distance from the scanning start point of each original on the basis of the position at which the recording head moves at a constant speed and passes. Controlling the moving speed of the pickup head according to the distance detected and the copy ratio so that the recording start point of the copy is simultaneously scanned by the pickup head and the recording head, and installed on the recording cylinder in the cylinder axial direction for use in the copier. A method for controlling the copy position on a recording film is provided.

BEST MODE Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 illustrates a copier, such as a color syringe, capable of copying at various copy ratios on a recording film to a predetermined placement position according to a predetermined trimming of an image to which the method according to the present invention is applied. The recording cylinders 14 are rotated at a constant speed by the synchronous motors 2 and 15, respectively.

Originals No. 1 to No. 3 mounted on the original cylinder 1 are scanned photoelectrically and continuously by the pickup head 4, and the pickup head 4 is used to obtain an image signal input to the calculation circuit 9; It moves along the screw rod 6 by the motor 5 in the image cylinder axial direction.

The conventional type computing circuit 9 used in the conventional color syringe has calculated color control conditions such as logarithmic conversion, color correction, classification control, line magnification control, and the like. The color control conditions for each original are set from the data preset circuit 22 to the arithmetic circuit 3 by timing pulses drawn out from the masking circuit 11. The image signal calculated in the computing device 9 is sent to an analog-to-digital converter 10 described later as an A / D converter.

By using the sampling pulses generated in the timing controller 8 based on the clock pulses generated by the rotary encoder 3 and the linear encoder 7 in the A / D converter 10, the image signal is It is converted into a digital image signal and supplied to the masking circuit 11.

2 shows pulse counters 30, 31, trimming point setters 32, 34, 36, 39, size comparators 33, 35, 37, 39, and AND gates 40-. 43 illustrates a specific embodiment of the masking circuit 11 illustrated in FIG. Each of the trimming point setters 32, 34, 36, 38 is composed of shift registers 44-46, 47-49, 50-52, 53-55 in the data preset circuit 22, respectively. It is connected to each. In the shift registers 44 to 55, the trimming points P ₁ , P ₂ , P ₃ , P ₄ , of the original pictures No. 1 to No. 3 provided on the image cylinder 1 developed as shown in FIG. 3A are shown in FIG. 3A. It is set as the number of pulses from the origin P (0,0) indicating the coordinates of P ₅ and P ₆ .

For example, in the shift registers 44 and 47, distances corresponding to the coordinates XP ₁ and XP ₂ of the X-axis of the trimming points P ₁ and P ₂ of the original picture No. ₁ are set as the number of pulses, and the shift register 50 In 53, distances corresponding to the coordinates Y _P1 and Y _P2 in the Y-axis direction of the trimming points P ₁ and P ₂ of the same original are set as the number of pulses. The coordinates of the trimming point of the original picture are detected in advance by an observer (not shown) attached to the pickup head 4, and are set in the data preset circuit 22 together with the copy ratio and the copying condition of the original picture.

In the remaining shift registers 45, 48, 51, 54 and shift registers 46, 49, 52, 55, the distance corresponding to the coordinates of the trimming points of the original Nos. 2 and 3 is described above. It is set as the number of pulses in one way. Each shift register in the data preset circuit 22 is controlled by a shift pulse at the same timing as when setting copy conditions of each original in the arithmetic circuit 9, that is, before each original is photoelectrically scanned.

When the number of pulses of the X clock pulses generated by the timing controller 8 is equal to or greater than the value set in the trimming point setter 32 counted by the pulse counter 30, the size comparator 33 generates the high level signal H. Outputs When the number of pulses of the X clock pulse is less than or equal to the value set in the trimming point setter 32, when the number of pulses of the Y clock pulse is more than or equal to the value set in the trimming point setter 36, and the number of pulses of the Y clock pulses is the trimming point setter ( When less than or equal to the value set in 38, the other size comparators 35, 37 and 39 output the high level signal H in the same manner as described above.

Therefore, as shown by the broken line in FIG. 3A, the image signals corresponding to the trimming portions of the original Nos. 1 to 3 are output from the masking circuit 11 in the order of the scanning lines. The image signal output from the masking circuit 11 is written in the address given by the digitizer 23 of the buffer memory 12 constituting the sizer by the write pulse generated by the timing controller 8.

The addressing of the buffer memory 12 is performed by the digitizer 23 as follows. That is, as for the printed documents on which original numbers No. 1 to 3 are arranged according to a predetermined copy ratio, a fixed digitizer table corresponding to the origin P '(O', O ') of the recording cylinder 14 is provided as shown in FIG. 3B. do. Then, the coordinates (X _P1 ′, Y _P1 ′) of the points P ₁ ′, P ₂ ′ ‥ ‥ P ₆ ′ of the copy on the printed document corresponding to the trimming points P ₁ , P ₂ ‥‥‥ P ₆ of the original, (X _P2 ′, Y _P2 ′)... (X _P6 ′, Y _P6 ′) are read by a cursor and stored in the address memory of the batch data register 24. The picked-up image signal between the points P ₁ and P ₂ of the original No. ₁ is successively recorded at the address in the buffer memory 12 corresponding to the coordinates Y _P1 ′ -Y _P2 ′ in the Y direction on the digitizer 23.

The buffer memory 12 constituting the size setter has a capacity corresponding to one scanning line of the recording cylinder 14 in its circumferential direction, and its address number "0" on the surface of the recording cylinder 14 in its circumferential direction. Corresponds to the origin. The reading of the image signal from the buffer memory 12 is performed by the linear encoder 20 coaxially attached to the linear encoder 20 and the recording cylinder 14 attached to the recording head 17 depending on a predetermined copy ratio. Based on the clock pulse generated by (16), the read pulse generated by the timing controller 21 is read out from the address number "0" in the address order.

The image signal read out from the buffer memory 12 is converted into an analog image signal by a digital-analog converter (hereinafter referred to as a D / A converter) 13 by the motor 18 through the screw rod 19. Supplied to the driving recording head 17, the recording head 17 controls the exposure amount to record the duplicate image on the recording film provided in the recording cylinder 14.

In this case, however, the coordinates X _P1 ′, X _P2 ′,... On the engraving original read by the digitizer 23 are used. X _P6 ′ and the coordinates of the trimming point of the original X _P1 , X _P2 . The relationship between X _P6 , that is, the relationship of the cylinder axial position between the original and the corresponding radiation, is not determined so that exact positioning of the radiation cannot be performed.

Position control of the radiation in the cylinder axial direction according to the present invention is performed as follows.

The pickup head when the recording head 17 scans the origin P ″ (0 ″, 0 ″) of the recording cylinder 14 located at the distance X ₂ before the point P ₁ ″ corresponding to the trimming point P ₁ as shown in FIG. 4A. If (4) scans the position of the front part located at the distance X ₁ before the trimming point P ₁ of the original picture on the image cylinder 1 as shown in Fig. 4B, the movement speed of the pickup head 4 and the recording head 17 is The distance (absolute value) and time in the cylinder axial direction are shown in FIG. 5, indicated by the horizontal and vertical axes.

When the recording head 17 is moved to the distance X ₂ at time t ₃ , the pickup head 4 should be moved to the distance X ₁ for t ₂ times. Also after the trimming point P _{1 in} FIG. 4B (ie after the distance X ₁ ), the pick-up head 4 must be moved at a constant speed corresponding to the radiation magnification M ₁ . However, if the voltage supplied to the motor 5 for driving the pickup head 4 is changed to change the rotation speed, the rotation speed at which the motor 5 is changed while the pickup head 4 moves the distance Δl. Takes any time t ₂ -t ₁ that is stable at (actually this is an integer). Therefore, the voltage supplied to the motor 5 must be changed until after time t ₁ after starting start to obtain this distance Δl.

Starting movement of the pick-up head 4 from the starting position when a corresponding voltage is applied to the Motor that the size ratio M ₁ so as to change the moving speed of the pick-up head 4, corresponding to the size ratio M ₁ at time t ₁ after the start The corresponding magnification M ₂ will be obtained as follows. Of course, in this case, it is assumed that the motors 5 and 18 for driving the pickup head 4 and the recording head 17 are kept at a stable rotational speed from the starting position.

When the rotation speed of the recording cylinder 17 is R (fixed value), and the moving distance of the recording head 17 in the cylinder axial direction during one rotation of the recording cylinder 14 is L (fixed value), the time t ₂ is as follows. same.

이므로Therefore, when the copy magnification is M ₁ , the moving speed of the pickup head 4 is

Because of

therefore,

Also,

Then, the size M ₂ is obtained By canceling the formula (1) (2) and from the t _1, t ₂ (3) as follows.

In other words, the pick-up head 4 until it reaches the position of the x ₁ -Δℓ initially the rate of starting and reaches the position of the movement while the speed -Δℓ x ₁ corresponding to the size M ₂ in the cylinder axial direction M ₁ A motor 5 which drives the pickup head 4 by the position controller 25 illustrated in FIG. 1 so that scanning of an arbitrary point of the original picture and recording of a point corresponding to an arbitrary point of copying are simultaneously performed. It can be easily inferred from the results that the copy position is easily determined because the correction voltage is applied to it.

6 shows a pulse counter 60, 61, a set counter 62, 63, a multiplier 64, a magnification preset circuit 65, a D / A converter 66, 67, 75 connected to the counter. Position controller 25 comprising a differential amplifier 68, switch circuits 69 and 74, adder 70, arithmetic circuit 71 such as a central processing unit (CPU), and registers 72 and 73 It shows a specific embodiment of the.

As described above, corresponding to the radiation magnifications M ₁ and M ₂ in the position controller 25 to move the pickup head 4 at a speed corresponding to the size M ₂ in the cylinder axial direction until X ₁ -ΔL is reached. The voltage is calculated in advance in the arithmetic circuit 71 corresponding to the data supplied from the batch data register 24 and the data preset circuit 22 and written in registers 72 and 73 in advance. The pick-up head to reach the x ₁ -Δℓ before and voltage corresponding to x ₁ After reaching the voltage -Δℓ copy magnification and the copy magnification corresponding to M ₂ M ₁ is D from the register 73 and the register 72 / It is sent to the adder 70 through the A converter 75.

On the other hand, the voltage pick-up head at a speed corresponding to a reproduction ratio M ₂ of the cylinder axis direction, which pick-up head 4, the switch circuit 69 until it reaches ₁ x -Δℓ is opened corresponding to the copy magnification M ₂ ( 4) is supplied from the adder 70 to the motor 5 to move.

When the pickup head 4 reaches x ₁ -ΔL, the voltage corresponding to the radiation magnification M ₁ and the correction voltage to be supplied to the motor 5 are obtained as follows.

Each counter 60, 61 counts X _in and X _out clock pulses, and each of the pulses is each controlled by the timing controller 8 or 21 per rotation of the image cylinder 1 or the recording cylinder 14, respectively. Is generated. For example, if the fourth-degree x ₁ and x ₂ in the preset counter 62, 63 is set a value of x ₁ and x _{2 in} x values, and x is subtracted _out by the clock pulse signal x ₁ -x Print _in and x ₂ -x _out . The signal x ₂ -x _out output from the preset counter 63 is sent to the D / A converter 67 and converted into the analog voltage signal V _uut . The signal x _1- x _in output from the preset counter 62 is sent to the multiplier 64 and multiplied by the radiation magnification M ₁ set in the magnification preset circuit 65. The multiplied signal is then supplied to the D / A converter 66 and converted into the analog voltage signal V _in .

The signal V _in mill V _out corresponding to M ₁ (x ₁ -x _in ) and x ₂ -x _out is calculated as V _out -V _in , i.e. to obtain signal V _R , x ₂ -x _out -M ₁ (x _1- x _in ) is sent to the differential amplifier 68 where it is performed. When the pickup head 4 is located between x ₁ -ΔL and x ₁ , the output signal V _R from the differential amplifier 68 is controlled by the switch circuit 69 via one input terminal of the adder 70, The moving speed of the pickup head 4 is controlled so that the signal V _R is zero. On the other hand, after the pick-up head 4 reaches x ₁ -ΔL, the voltage corresponding to the radiation magnification M ₁ causes the D / A converter 75 to be controlled by controlling the switch circuit 74 as described above from the register 72. It is applied to the other input terminal of the adder 70 through. Therefore, the pickup head 4 is supplied to the motor ₅ with the voltage V _M1 corresponding to the radiation magnification M ₁ and the correction voltage R _R as the pickup head 4 is moved from x ₁ -ΔL to x ₁ . At the same time that it is moved at a distance x ₁ on No. ₁ , the recording head 17 is moved at a distance x ₂ on the recording film, and the voltage corresponding to the radiation magnification M ₁ after the pickup head 4 arrives at the distance x ₁ . Since it is supplied to this motor, the pickup head 4 is controlled to move at a speed corresponding to the radiation magnification M ₂ .

The preset counter 63 and the arithmetic circuit 71 correspond to the coordinates in the x-direction read by the digitizer 22 at points P ₁ ′, P ₃ ′ and P ₅ ′ (see FIG. 3) on the engraving original. The value is set. The preset counter 62 and the arithmetic circuit 71 are provided with the dice of the pick-up head 4 when the recording head 17 is in a position corresponding to the points P ₁ ′, P ₃ ′ and P ₅ ′ on the printed document. The corresponding value is set.

The value to be set in the arithmetic circuit 71 of the preset counters 62 and 63 is obtained in advance and stored in the batch data register 24. For example, when the recording head 17 is moved to a predetermined position, the recording head 17 has a fourth value in which Δℓ corresponding to the response time of the motor is fixed without failure and a value corresponding to the following radiation magnification is set. It is located at X ₄ -ΔL in the figure. The copy magnification set from the data preset circuit 22 to the magnification preset circuit 65 and the calculation circuit 71 is set at the same time that a predetermined value is set in the preset counters 62, 63 and the like.

FIG. 7 shows another embodiment of the position controller 25 of FIG. 1, which is a cue control circuit 77, pulse counters 78, 80, preset circuits 79, 81, 83, multipliers. (82), subtractor 84 with large and small discrimination function, latch circuits 85 and 86, inverter 87, correction pulse generator 88, AND gates 89 and 92, magnification pulse generator 90 ) And an OR gate 91.

Before the pickup head 4 reaches x ₁ -Δl, a pulse signal having a frequency corresponding to the radiation magnification M ₂ generated by the magnification pulse generator 90 is generated by the pickup head 4 at the radiation magnification in the cylinder axial direction. The motor 5 is supplied to the motor 5 through the AND gate 92 and the OR gate 91 so as to move at a corresponding speed. Then, when the pickup head 4 reaches x ₁ -Δl, the value x ₁ sent out from the preset circuit 79 in the pulse counter 78 is subtracted by x _in clock pulses and the pulse counter 70 receives the signal x _The signal x _1- x _in is outputted to the multiplier 82 multiplied by the radiation magnification M ₁ set _in the preset circuit 83. The multiplied signal M ₁ (x ₁ -x _in ) is supplied to one input terminal of the subtractor 84.

On the other hand, in the pulse counter 80, the value x ₂ applied from the preset circuit 87 is subtracted by x _out clock pulses supplied to the pulse counter 50 via the queue control circuit 77, and the pulse counter 80 ) Sends a signal x ₂ -x _out to the other input terminal of the subtractor 84.

In the subtractor 84, an operation of x ₂ -x _out -M ₁ (x ₁ -x _in ) is performed, and when the operation result is positive (+) or negative (-), the subtractor 84 is output terminal D ₁ or The high level signal H is output to D ₂ . That is, when the high level signal H is output from the terminal D ₁ , the moving speed of the pickup head 4 is lower than the predetermined moving speed. In this case, the correction pulse signal generated by the correction pulse generator 88 while the high level signal H is drawn out from the output terminal D ₁ is sent to the OR gate 91 through the AND gate 89 to be multiplied. It is added to the pulse signal corresponding to the radiation magnification M ₁ generated by the pulse generator 90. The signal output from the OR gate 91 is applied to the motor 5 through the AND gate 92 to increase the moving speed of the pickup head 4.

When the high level signal H is output from the output terminal D ₂ of the subtractor 84, the moving speed of the pickup head 4 is faster than the set moving speed. In this case, the high level signal (H) that the terminal (D _2), the pulse signal corresponding to the magnification M ₁ to be supplied is generated by the scale pulse generator 90 for output to the Motor (5) to the AND gate (92 Stops by) decreases the moving speed of the pickup head 4.

Therefore, the pickup speed of the pickup head 4 is set by the pickup head 4 as the original No. The recording head 17 is controlled to move at a distance x ₂ on the recording film while being moved at a distance x ₁ of one phase.

When multiple originals are copied as shown in FIG. 4, the preset circuits 78, 80 and 83 are cleared after the first original is processed, and then the copying conditions and the copy ratio for the next original are set in the preset circuit.

The latch circuits 85 and 86 latch the output signal of the subtractor 84 by a latch pulse in a short time so that the pulse counters 78 and 80 and the subtractor 84 output stable results. The latch pulse is generated from the leading edge of the x _in clock pulse.

When the input timings of the x _in clock pulses and the x _out clock pulses overlap, an operation in the subtractor 84 becomes unstable and an incorrect operation result is latched in the latch circuits 85 and 86. In this case, the queue control circuit 77 controls the timing of the x _out clock pulses so that the x _in and x _out clock pulses do not overlap.

8 shows an AND gate 93 to 95, an OR gate 96, a D flip-flop circuit 97, a monostable multivibrator 98 to 102, inverters 103 to 106, and a delay circuit 107. One embodiment of a conventional queue control circuit 77 composed of < RTI ID = 0.0 >

9 shows the time difference art of the pulse signal of FIG.

When the trailing edge of the x _in clock pulse is overlapped with the leading edge of the x _out clock pulse as shown _in FIG. 9, the timing of the x _out clock pulse is slightly delayed or shifted so that the timing of the x _in and x _out clock pulses is separated at a short distance.

The X _out clock pulse is applied to one input terminal of the AND gate 93 and the flip-flop circuit 97. The pulse signal P ₁ from the x _in clock pulse is generated by the monostable multivibrator 98, the inverter 105 and the monostable multivibrator 99, and is flip-flop circuits through the inverter 103. It is applied to the terminal D of 97 and the other terminal of the AND gate 93.

The output signal from the AND gate 93 is delayed by the delay circuit 107 to output the signal P ₃ to one input terminal of the AND gate 94. The output signal from the flip-flop circuit 97 is inverted by the inverter 104 and the output signal P ₂ of the inverter 104 is applied to the other input terminal of the AND gate 94. The output signal of the flip-flop circuit 97 is also supplied to one input terminal of the AND gate 95, and the signal P ₁ is sent to the other input terminal of the AND gate 95 through the monostable multivibrator 100. do. The output signal from the AND gate 94 and the output signal P ₄ from the AND gate 95 are applied to the OR gate 96. The output signal from the OR gate 96 passes through the monostable multivibrator 102 to obtain the pulse signal P ₅ sent to the pulse counter 50 illustrated in FIG.

The output signal P ₄ is applied to the flip-flop circuit 97 through the inverter 106 and the monostable multivibrator 101 to reset the flip-flop circuit 97.

While the invention has been described and illustrated with respect to one particular embodiment employed as described above, there may be many modifications and variations without departing from the scope of the invention. For example, the image cylinder and the recording cylinder can be connected and driven by one motor.

Claims (1)

A method for controlling a copying position on a recording film mounted on a recording cylinder in a cylinder axial direction for use in a copier, the method comprising: starting point of recording of each copy image and each original image based on a reference position at which the recording head moves at a fixed speed Detecting the distances of the pickup head and the recording head from the scanning start point of the image, and at the detected distance and each copy magnification such that the scanning starting point of the original picture and the recording starting point of the copy are scanned substantially simultaneously by the pickup head and the recording head. Therefore, the copy position control method comprising the step of controlling the feed rate of the pickup head.

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