JPH02220880A - Printing apparatus - Google Patents

Abstract

PURPOSE:To always form a printing image on printing paper at a predetermined position by reading stored correction data when a printing speed is changed to adjust the position of the image printed on the printing paper. CONSTITUTION:When a printing speed is altered, the correction data of a printing position is referred in order to correct the shift of the printing position generated by the altered printing speed and the number of pulses corresponding to the data is supplied to a pulse motor 50 through a pulse starting device 50A. The number of the pulses supplied to the pulse motor 50 from the pulse starting device 50A is supplied corresponding to altered printing position set data. Thereafter, at each time when the printing position is altered or the printing speed is altered, this processing is performed and the number of the pulses supplied to the pulse motor 50 is altered and a slide plate 56 is moved in either one of upward and downward directions. That is, the feed timing of the printing paper P fed and supplied from a guide roller 62 to a plate cylinder 20 is altered and the printing position is altered.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a printing device suitable for adjusting the position of an image printed on printing paper.

(Prior art and its problems) As a conventional printing device, those shown in FIGS. 8 and 9 are known.

In FIG. 8, a stencil paper (not shown) whose one end is fixed to a clamp mechanism 21 is wound around the plate cylinder 20, and the plate cylinder 20 rotates in the direction of arrow C.

Further, the printing paper P is conveyed in the direction of the arrow while being held between the guide roller 62 and the timing roller 63, and the printing paper P
is arranged between the plate cylinder 20 and the press roller 40, the printing process on the printing paper P is performed by the pressing operation of the press roller 40 against the plate cylinder 20 side.

In this example, the position of the printed image formed on the printing paper P is adjusted by adjusting the timing at which the printing paper P is sent toward the plate cylinder 20 in accordance with the rotational position of the plate cylinder 20.

For example, as shown in FIG. 8(a), when feeding of printing paper P is started from the position of the clamp mechanism 21, a subprint image P1 is obtained as shown in FIG. 8(b). It turns out. That is, assuming that the transport direction of the printing paper P is the "top" direction and the opposite side is the "bottom" direction, the printed image P1 is formed closer to the "top" direction in this example.

On the other hand, as shown in FIG. 9(a), the clamp mechanism 21 is
When the feeding of the printing paper P is started from this position, a printed image P1 is obtained as shown in FIG. 3(b).

That is, in this example, the print image P is formed closer to the "ground" direction of the print paper P.

The reason why the image positions differ in this way is that when the plate cylinder 20 is rotated in the direction of arrow C, feeding of the printing paper P starts from when the clamp mechanism 21 is located, and when the clamp mechanism 21 is located. Compared to starting the feeding of the printing paper P when it is in the position ■, the paper feeding timing is earlier when it starts feeding the printing paper P when it is in the position ■.In the example shown in FIG. This is due to the fact that the printed image P is obtained closer to the "ground" direction as the sheet feeding timing is earlier.

As described above, in the conventional printing apparatus, the position of the print image P1 formed on the printing paper P is determined by the feeding timing of the printing paper P that is fed to the plate cylinder 20 side. Therefore, if this paper feeding timing is constant, the position of the printed image will always be constant.

However, in the conventional apparatus as described above, even if the printing speed changes, the position of the printed image is adjusted only by the paper feeding timing as described above. There was a problem in that it shifted toward the ground.

That is, in this type of apparatus, for example, the printing paper P conveyed from the left in FIG. and is sent to the plate cylinder 20 side. In this case, as the printing speed increases, the conveyance speed of the printing paper P toward the guide curler increases.

On the other hand, when the conveyance speed toward the guide roller side increases in this way, the impact force when the printing paper P is sandwiched between the guide roller 62 and the timing roller 63 becomes large, and as a result, the impact force between the guide roller 62 and the timing roller 63 increases. The amount it bites into also increases. Therefore, the standby position where the printing paper P is stopped between the guide roller 62 and the timing roller 63 approaches the plate cylinder side as the printing speed increases. On the other hand, this state can be equated to a case where the sheet is fed toward the plate cylinder 20 at an early timing. For this reason, for example, if the printing speed increases, the printed image position will be
It will shift toward the ground J direction (see Figure 9(b)).

(Object of the Invention) In view of the above problems, it is an object of the present invention to provide a printing device that can always form a printed image at a desired position on printing paper even if the printing speed changes.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a printing apparatus capable of variably setting the printing speed, including a vertical adjustment means for adjusting the position of an image printed on printing paper; a correction data storage means for storing print position correction data in order to correct printing position deviation caused by a change in speed; and a correction data storage means for reading out the print position correction data stored in the storage means according to the variable setting state of the printing speed; The present invention is characterized by comprising a drive control means for driving and controlling the vertical adjustment means according to data.

(Explanation of Examples) An embodiment of this invention will be described below.

Note that the same components as those in the conventional example described above will be described with the same reference numerals.

FIG. 1 is an external view of a printing apparatus 1 according to the present invention.

In the figure, a lid 2 is attached to one side of the upper part of a case 1a of a printing device 1 with a hinge 2a (see Figure 3), etc., so that the lid 2 can be opened and closed. It is configured to set the base paper S at a predetermined position.

Further, as shown in FIG. 2, the case 1a is provided with an operation panel 5 such as a flat keyboard, and this operation panel 5 includes a numeric keypad 5a for setting the number of prints, a print start key 5b, a print stop key 50, Print position adjustment key 5d
, a print speed setting key 5e, and a display section 5f such as an LCD display for displaying the set number of prints and the like.

FIG. 3 shows the internal mechanism of the printing device 1 according to the present invention.

In the figure, the cylindrical plate cylinder 20 has its own central axis 20
It is rotatably supported around c by a machine frame (not shown). This plate cylinder 20 has a porous structure and has a clamp mechanism 21 on the outer periphery.
It is configured to intermittently lock one end of the stencil paper S.

That is, the clamp mechanism 21 includes a strip-shaped permanent magnet 22 fixed to the outer peripheral surface of the plate cylinder 20 and extending along one generatrix thereof, and a shaft 23 extending along the axial direction of the plate cylinder 20. It has a pivotally supported movable clamp piece 24. Further, a gear 25 is attached to one end of the shaft 23, and the plate cylinder 20 is attached to the initial rotational position (
When the lever 26 is in the position shown in FIG. 3), a drive gear 27 supported by one end of the lever 26 meshes appropriately. The lever 26 is supported on a machine frame (not shown) by a pivot 28, and when the solenoid 29 is not energized, it is biased counterclockwise in the figure by the spring force of a spring 30 to separate the drive gear 27 from the gear 25. On the other hand, when the solenoid 29 is energized, it rotates clockwise in the figure against the spring force of the spring 30, and the drive gear 27 is connected to the gear 25 of the plate cylinder 20 at the initial rotation position. It is designed to mesh. The drive gear 27 is rotated as appropriate by an electric motor 31 attached to the lever 26, which rotates the gear 25, and the clamp piece 24 is moved between a clamp position where it is attracted to the permanent magnet 22 and a counterclockwise direction in the figure from the clamp position. It is configured to be rotated between the fully open position and the fully open position rotated by approximately 180 degrees.

The plate cylinder 20 is drivingly connected to a sprocket 34a provided coaxially with the central axis 20c, and this sprocket 34a
is drivingly connected to a drive sprocket 34b of a motor 33 by an endless chain 32. With this power transmission device, the plate cylinder 20 is rotated counterclockwise in the figure intermittently or continuously by the motor 33.

Further, a printing ink supply means 35 is provided in the direction of the plate cylinder 20, and this printing ink supply means 35 is disposed so that its outer peripheral surface contacts the inner peripheral surface of the plate cylinder 20, and its center A squeegee roller 36 rotatable around a shaft 37, and a doctor rod 38 extending along the roller DJ line direction with a predetermined gap from the outer peripheral surface of the squeegee roller 36.
The squeegee roller 36 is rotationally driven in the same direction as the plate cylinder 20 in synchronization with the rotation of the plate cylinder 20, thereby supplying the printing ink in the ink pool A to the inner peripheral surface of the plate cylinder 20. It is configured as follows. That is, as the squeegee roller 36 rotates, the printing ink in the ink pool A is
The ink passes through the gap between this roller and the doctor rod 38, and at that time, the ink is measured to form a printing ink layer with a thickness of - on the outer peripheral surface of the squeegee roller 36. As it rotates, it is supplied to the inner peripheral surface of the plate cylinder 20 and used for printing.

Further, 40 is a press roller for pressing the printing paper P against the plate cylinder 20.

On the other hand, the paper feed tray 4 is provided with a pinion 48 connected to an output transmission mechanism that transmits the output of a motor (not shown), and a rack 49 that is engaged with the pinion 48. The rack 49 is provided substantially perpendicular to the paper feed tray 4 and has a wave-like engagement portion 49a to be engaged with the pinion 48, so that the paper feed tray 4 is also moved up and down as the pinion 48 rotates. That is, the paper feed tray 4 is moved up and down in accordance with the amount of printing paper P set on the paper feed tray 4, so that the paper feed mechanism 60 can easily take in the printing paper P.

The paper feeding mechanism 60 includes a paper feeding roller 61 made of rubber or the like.
It is composed of a guide roller 62, a timing roller 63, etc., and the printing paper P picked up from the second most paper sheet P stacked on the paper feed tray 4'2 by the paper feeding roller 61 is The paper is further conveyed to the guide roller 62 side by the paper roller 61, and is temporarily held in a state where a predetermined loop is formed between the guide roller 62 and the timing roller 63.

Incidentally, in this embodiment, a vertical adjustment mechanism 300 is provided that adjusts the operation of the guide roller 62 so that a printed image can be formed at a desired position on the printing paper P regardless of the printing speed.

Hereinafter, the vertical adjustment mechanism 300 will be described in detail with reference to FIGS. 4 and 5.

FIG. 4 shows a schematic configuration of the vertical adjustment mechanism 300, in which the chain 32 suspended from the drive sprocket 34b of the motor 33 rotates counterclockwise (in the direction of arrow E), and the large diameter roller 51. Plate cylinder 2 via small diameter opening = 52a
0, and further connected to the drive sprocket 34b of the motor 33 via the small diameter rollers 52b, 52c, 52d, the cam pulley 53, the small diameter rollers 52e, 52f, 52g, 52h, and again the large diameter roller 51. has been done.

Further, a guide roller cam 55 is mounted on the rotating shaft 54 of the cam pulley 53, and as will be described later, the rotation start timing of the guide roller 62 is adjusted by the operation of the guide roller cam 55.

On the other hand, 50 is a pulse motor rotated by the operation of the print position adjustment key 5d or the print speed setting key 5e, and is configured so that its rotational force is converted into minute vertical movement of the slide plate 56 via the deceleration mechanism 110. There is.

That is, the speed reduction mechanism 110 includes a small diameter gear 57. attached to the axis of the pulse motor 50. It consists of a large diameter gear 58 that meshes with the small diameter gear 57 and a control rod 59 that is screwed into a through hole (not shown) provided along the central axis of the large diameter gear 58. are integrated.

Therefore, the rotational force of the pulse motor 56 is decelerated by the small-diameter gear 57 and the large-diameter gear 58, and further converted into minute vertical movement by the control rod 59, so that the slide plate 56 is also moved vertically. .

Incidentally, the small diameter gears 52C and 52h are attached to the slide plate 56. Therefore, the pulse motor 5
When the slide plate 56 is moved up and down by driving the small diameter gears 52c and 52h, the small diameter gears 52c and 52h are also moved up and down accordingly.

On the other hand, FIG. 5 shows a fan-shaped gear 67 with which the guide roller cam 55 comes into contact.

This fan-shaped gear 67 is rotatable around a shaft 65, and has a thread 73 cut in its arcuate portion to mesh with a thread 62a provided on the guide roller 62. Further, a locking part 71 to which one end of a spring 68 is fixed is provided on one side edge of the sector gear 67, and the other end of the spring 68 is fixed to a protrusion 72.
is always urged counterclockwise by the tension of the spring 68. The locking portion 71 is configured to be lockable at a desired location within the elliptical locking hole 69, and by changing the locking position of the locking portion 71, the tension of the spring 68 can be adjusted as appropriate. It is configured.

In addition, at the apex portion of the fan-shaped gear 67 bent in an L-shape,
A bearing 66 is rotatably provided via a shaft 66a, and this bearing 66 is in contact with the guide roller cam 55.

The vertical adjustment mechanism 300 is configured as described above, and its operation will be explained next.

Here, for example, the "ground" direction button of the print position adjustment key 5d on the operation panel 5 is operated, and the print image is changed to "ground".
A case in which they are formed shifted in the direction will be described.

In this embodiment, when an image movement operation is performed to shift the image toward the "down" direction, the slide plate 56 is configured to move in two directions in FIG. 4.

By the way, the chain 32 is rotating counterclockwise (in the direction of arrow E). Therefore, when the slide plate 56 moves upward, the small diameter gears 52c and 52h also move upward, and the chain 32 as a whole moves counterclockwise (in the direction of arrow E), and the cam pulley 53 also moves counterclockwise. rotated clockwise.

As a result, the guide roller cam 55, which rotates in conjunction with the cam pulley 53, is also rotated counterclockwise.

On the other hand, when the guide roller cam 55 rotates counterclockwise as described above, the bearing 66 of the protruding portion 55a of the cam 55
The timing of contact will also be earlier. For this reason, the rotation timing of the fan-shaped gear 67 in the clockwise direction (arrow F direction) also becomes earlier. Therefore, the rotation start time of the guide roller 62 becomes earlier, and the timing at which the printing paper P is fed to the plate cylinder 20 side also becomes earlier. This is equivalent to moving the clamp mechanism 21 to the position (2) as shown in FIG.

For this reason, the printed image is formed from the "ground" direction, as shown in FIG. 3(b).

In this way, by operating the print position adjustment key 5d provided on the operation panel 5, the image position can be adjusted as appropriate.

By the way, in the above example, for convenience of explanation, the case where the print position adjustment key 5d is operated and the vertical adjustment mechanism 300 operates is explained, but in this embodiment, as will be described later,
The number of pulses given to the pulse motor 50 also changes depending on the printing speed set by the printing speed setting key 5e, so that a printed image is always stably formed at a desired location on the printing paper P regardless of the printing speed. It is configured so that

Returning to the explanation of FIG. 3 again, 1. Around the plate cylinder 20, above the paper feed table 4, there is a stencil paper removal mechanism 70. A printed paper peeling claw 80 is provided at a position facing the paper feed mechanism 60, and this claw 80 is used to remove the printed paper after printing has been completed from the plate cylinder 20, and the peeled paper is removed from the plate cylinder. Due to the rotational force given by the rotation of 20, the sheets fly to the lower right side in the figure, and are successively stacked and held on the sheet discharge table 3.

On the stencil set plate 100 on which the stencil paper S is set, there is provided an optical sensor 101 that detects the presence or absence of the stencil paper S. When it is detected that the stencil paper S is set on the stencil paper set board 100, Either one of the feed rollers 102 and 103 is rotationally driven to move the stencil paper S onto the conveyance path 10.
7 to the clamp mechanism 21.

As explained above, in the printing apparatus 1 in this embodiment, the stencil paper S is conveyed to the clamp mechanism 21, the leading end of which is clamped to a part of the plate cylinder 20, and the stencil paper S is placed on the outer peripheral surface of the plate cylinder 20. After wrapping and applying ink to the stencil paper S, printing is performed by wrapping and pressing the printing paper P against the outer peripheral surface of the printing cylinder, and each mechanism is controlled by a microcomputer.

By the way, the feature of this embodiment device is that when information that affects the print position is given to the device by operating the print position adjustment key 5d or print speed setting key 5e on the operation panel 5, the information is Based on this, the rotation speed of the pulse motor 50 is controlled, and the vertical adjustment mechanism 300 is configured to operate in order to obtain a printed image at a desired location on the printing paper P.

FIG. 6 shows the electrical components of the printing apparatus 1 as described above.

In the figure, a CPU 200 composed of a microprocessor or the like includes a ROM 210 storing programs for controlling various mechanisms within the device, and an operation panel 5. Optical sensor 101 for detecting the presence or absence of stencil paper S. Duplicate paper S
an optical sensor 90 that detects when the plate cylinder 20 has been conveyed to a position where it can be clamped, and a plate cylinder drive motor 33 that constitutes a plate cylinder drive unit that rotates the plate cylinder 20 in divided rotations or continuous rotation.
゜ Paper feed roller drive motor 60M, conveyance roller drive motor 102M that conveys the stencil paper S, clamp mechanism 2
1. Plate discharge mechanism (stencil paper removal mechanism) 70, pulse motor 50. A pulse start device 50A that supplies a number of pulses corresponding to the print position data and print speed data, and a pulse start device 50A that temporarily stores the calculation results of the microprocessor, as well as print number setting information or print speed setting keys manually entered from the numeric keypad 5a of the operation panel 5. A RAM 220 that stores positional deviation correction data from time to time in order to correct printing positional deviations caused by changes in the printing speed information set by the print position adjustment key 5e or the print position information set by the print position adjustment key 5d.
are connected to each other.

Next, the processing procedure of the apparatus of this embodiment will be explained according to the flowchart shown in FIG.

When the stencil sheet S (original) is set on the stencil sheet setting plate 100, this is detected by the optical sensor 101 (step 501 affirmative), and the numeric keypad 5a of the operation panel 5 is pressed.
Print quantity setting information.

Furthermore, when print speed information and print position information are input using the print speed setting key 5e and print position adjustment key 5d, the respective input information is stored in the RAM 220.
(Steps 502 and 50)
3,504), which is one of the conditions for the subsequent printing process.

Next, when the print start key 5b is pressed (step 5
05 (affirmative), the clamping mechanism 21 is activated based on a command from the CPU 200, and the stencil paper S used in the previous printing and wrapped around the plate cylinder 20 is released from the clamped state, and is then released by the plate discharging mechanism 70. Plate cylinder 2
It is peeled off from the outer circumferential surface of 0 and discarded in a plate disposal box (not shown) (step 506).

Next, the conveyance roller drive motor 102M is driven by a command from the CPU 200, so that the conveyance roller 102
is rotationally driven, and the stencil paper S is conveyed to the clamp mechanism 21. When the leading edge of the stencil paper S reaches the clamp mechanism 21, this is detected by the optical sensor 90, and the detection signal is transmitted to the CPU 200, which issues a command to clamp the leading edge of the stencil paper S. Clamp mechanism 2
Send for 1. Therefore, one side edge of the stencil paper S is clamped by the clamp mechanism 21.

Thereafter, in response to a command from the CPU 200, the plate cylinder driving motor 33 is driven to rotate the plate cylinder 20 counterclockwise in the figure, and the stencil paper S is wound around the outer peripheral surface of the plate cylinder 20 (step 507).

In the next step 508, printing processing is performed based on the print number setting information, print speed setting information, and print position setting information stored in the RAM 220.

That is, in this printing process, the plate cylinder driving motor 33 that rotationally drives the plate cylinder 20 is controlled based on the printing speed setting information and printing position setting information stored in the RAM 220, and the printing position is adjusted according to the printing speed. The rotation start timing of the guide roller 62 is controlled so that the printing process at the print position according to the correction data and print position setting information is executed. That is, the CPU 200 comprehensively judges the print position correction data in order to correct the positional deviation caused by the print position and the set print speed of the print position setting information stored in the RAM 220, and thereby The number of pulses to be supplied to the pulse motor 50 is determined by controlling the pulse motor 50. Therefore, if the print position is set in the "ground" direction using the print position setting key 5d shown in FIG.
0. As a result, from the guide roller 62 to the plate cylinder 2
The feeding timing of the printing paper P that is conveyed toward 0 becomes earlier, and the position of the image formed on the printing paper P shifts toward the "ground" direction.

On the other hand, when the printing position is set in the "top" direction, the timing of feeding the paper conveyed from the guide roller 62 toward the plate cylinder 20 is delayed, and the image position formed on the printing paper P is set in the "top" direction.
direction.

Note that in the initial settings when the power is turned on, the print position is set to the center of the top and bottom. Therefore, data indicating this is also stored in the print position information set in the RAM 220.

Based on the information stored in the RAM 220 as described above, the plate cylinder 20. The press roller 40 is driven, the paper feed mechanism 60, the squeegee roller 36, etc. are operated, and printing is performed (step 508).

Next, the CPU 220 determines whether or not the number of printed sheets P on which printing has been completed has reached the set number of sheets to be printed (step 5
09). Here, when the set number of prints is reached (step 509, affirmative), the printing process ends. On the other hand, if the set number of prints has not been reached (step 509
In step 510, the CPU 200 first confirms that the printing speed has not been changed by operating the printing speed setting key 5e on the operation panel 5 (No), and then confirms that the printing position has not been changed by operating the printing position adjustment key 5d. (Step 512 is negative to confirm that there is no such thing), and the next printing process is performed based on the previous printing conditions (Step 508).

On the other hand, if there is a change in printing speed (step 51)
0 affirmative), the print position correction data is referred to in order to correct the print position deviation caused by the newly changed printing speed, and the number of pulses corresponding to the data is supplied to the pulse motor 50 via the pulse starting device 50A. (step 511).

Further, it is determined whether or not there is a change in the print position using the print position adjustment key 5d (step 512), and if there is no change, printing processing is performed under the above correction conditions (step 508). On the other hand, if there is a change in the print position using the print position adjustment key 5d (Yes in step 512), the changed information is rewritten in the RAM 220, and pulses corresponding to the data are supplied to the pulse motor 50 (step 513). ).

Note that the print position correction data stored in the RAM 220 in advance is determined by observing the print image shift that occurs at each print speed based on the image position printed at the minimum print speed.
The amount of movement of the slide plate 56 necessary to correct the deviation is stored as pulse number data to be supplied to the pulse motor 50 which is the drive source for moving the slide plate.

Therefore, in the subsequent printing process, the pulse starting device 5
The number of pulses supplied from 0A to the pulse motor 50 is supplied according to the changed print position setting information. Thereafter, each time the print position is changed by operating the print position setting key 5d, and each time the print speed is changed by the print speed setting key 5e, the above process is performed, and the number of pulses supplied to the pulse motor 50 is changed. As a result, the slide plate 56 shown in FIG. 4 is moved either up or down. That is, the feeding timing of the printing paper P that is conveyed and fed toward the plate cylinder 20 by the guide roller 62 is changed, and the printing position is changed.

As described above, the printing apparatus according to the present embodiment reads out the print position correction data stored in the RAM 200 according to changes in printing speed, and controls the vertical adjustment mechanism 300 according to the correction data. When printing, even if the initial printing speed and final printing speed are different, it is possible to obtain a printed matter with a constant printing position.

(Effects of the Invention) As described above, the printing device according to the present invention includes means for adjusting the position of an image printed on printing paper, and storage of correction data for correcting printing position deviation caused by a change in printing speed. When the printing speed changes, the stored correction data is read out and the position of the image printed on the printing paper is adjusted, so even if the printing speed changes, the image is always printed at the desired position on the printing paper. It has effects such as being able to form images.

[Brief explanation of the drawing]

FIG. 1 is an external view of a printing device according to the present invention, FIG. 2 is an explanatory diagram showing an operation panel, FIG. 3 is an overall schematic diagram showing the internal mechanism of the printing device, and FIG. 4 is a diagram used in the printing device. FIG. 5 is an explanatory diagram of the case where the guide roller cam is in contact with the fan-shaped gear in FIG. 4, and FIG. 6 is a block diagram showing the electrical configuration of the printing device. FIG. 7 is a flowchart showing the overall operation of the stencil printing apparatus described in "1", and FIGS. 8 and 9 are explanatory diagrams of a conventional printing apparatus. 1...Printing device 5...Operation panel 5d...Printing position adjustment key 5e...Printing speed setting key 20...Plate cylinder 30...Motor 50...Pulse Motor 55...Guide roller cam 56...Slide plate 57...Fan gear 200...CPU 220...RAM 300...Vertical adjustment mechanism! Fig. Fig. 5 Noro 3 (timing roller) (a no. (a) j Fig. 8 Fig. 9 (b)

Claims (1)

[Claims] 1. A printing device capable of variably setting the printing speed, comprising: a vertical adjustment means for adjusting the position of an image printed on printing paper; a correction data storage means for storing position correction data; and a drive for reading out the printing position correction data stored in the storage means according to the variable setting state of the printing speed and driving and controlling the above-mentioned vertical adjustment means according to the data. A printing device comprising: a control means;