JPH06135111A - Printer - Google Patents

Abstract

PURPOSE:To obtain a printer having a simple structure for conducting perfect printing and a structure for supplying unprocessed base printing paper to a non-printing surface at the time of single-side printing and preveting a wasteful use of base printing paper at this supplying time and a wasteful use of printing paper in the erroneous selection of a printing surface. CONSTITUTION:Lap parts 1A, 10A are formed by splitting a part of the peripheral walls of a pair of plate cylinders 1, 10. The lap parts 1A, 10A can clamp the tip end of base printing paper, thus eliminating a need for a conventional clamping mechanism. Furthermore, when a single-side printing is selected, the action position of the plate making device 3 or 13 is determined so that unprocessed base printing paper can be wound on the plate cylinder opposed to a non-printing surface. If unprocessed base printing paper is wound on the plate cylinder opposed to a non-printing surface upon selection of a single-side printing, this base printing paper is used intact for the reduction of the use amount of the base printing paper. A control part is provided for allowing single-side printing after giving a warning and changing over the plate making devices 3, 13 if unprocessed base printing paper is wound on the printing-side plate cylinder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing machine,
Particularly, the present invention relates to a structure for printing on both sides of one sheet.

[0002]

2. Description of the Related Art Conventionally, a stencil printing device is known as one of printing devices, and this printing device winds a printing base paper corresponding to a plate punched by a plate making device on a plate cylinder having an ink passage structure. It is equipped with a structure that allows the ink to seep out from the inside of the plate cylinder and transfer the ink to the paper that is in close contact with the base paper. The plate cylinder is provided with a clamp mechanism that clamps the front end of the printing base paper for winding the printing base paper, and the clamp mechanism includes a swingable holding claw attached to the surface of the plate cylinder. Is configured.

By the way, in the above-mentioned printing apparatus,
In recent years, it has been desired to reduce the printing cost by reducing the paper consumption.

For this reason, there has been a demand for double-sided printing in which both sides of the paper are printed. In this double-sided printing, once the printed paper is removed from the plate cylinder, the back side of the paper faces the printing base paper on the plate cylinder. It is designed to be fed by feeding in the state of being made.

However, in handling such a sheet, there are problems that the procedure for re-feeding the sheet is troublesome or that it takes a lot of time to obtain double-sided printing.

Therefore, conventionally, as shown in FIG. 6, a pair of plate cylinders A1 and A2 are provided, and a printing base paper having a content to be printed on each surface of the plate cylinders A1 and A2 is wound. However, there has been proposed a structure in which a sheet fed from the sheet feeding device B is passed between plate cylinders, and at this time, the plate cylinders are pressed against each other to enable printing on both sides of the sheet.

[0007]

By the way, in general, the surface of the plate cylinder is provided with clamp mechanisms C1 and C2 for holding the leading edge of the printing base paper. The clamp mechanisms C1 and C2 are the surface of the plate cylinder. Often protrudes from. For this reason, the plate cylinder is placed in advance at a position separated by at least a distance including the protruding height of the clamp mechanisms C1 and C2, for example, about 10 mm, and it is necessary to contact from this position and press the paper. I won't.

Therefore, in order to bring the plate cylinders into contact with each other from positions separated from each other, it is necessary to move the plate cylinders at a relatively high speed. Of these, the image behind the clamp position may not be printed.

However, when the plate cylinder is brought into contact with the plate cylinder at such a high speed from a distant position, the impact sound generated when the plate cylinder comes into contact with the plate cylinder is very large, and the impact sound is generated by the plate cylinder. 1
It will occur at every rotation.

Further, in order to move a relatively heavy plate cylinder at high speed to cause repeated collisions, it is necessary to increase the rigidity of the plate cylinder. Therefore, the plate cylinder and a drive unit for moving the plate cylinder are solid. I have to make it. Therefore, there has been a problem that the weight of the entire apparatus including the plate cylinder is significantly increased and the cost of the apparatus is significantly increased.

Therefore, in order to prevent the interference with the above-mentioned clamp mechanism, a structure has been proposed in which one of the plate cylinders is provided with a recess into which the clamp mechanism can be inserted (for example, Japanese Patent Laid-Open No. 3- 197078).

However, according to such a proposed structure, not only is it difficult to form the concave portion on the peripheral surface of the plate cylinder, but also when the ink supply mechanism is provided inside the plate cylinder, the ink A structure for retracting the ink supply roller at high speed is also necessary to prevent interference when the ink supply roller of the supply mechanism approaches the recess, and the structure is considerably complicated, including measures for ink leakage in the recess. Inevitably, as a result, the cost of the device may increase.

In a printing apparatus capable of such double-sided printing, for example, when performing single-sided printing, it is necessary to prevent ink from adhering to the back side of the surface of the printing paper on which the image is formed. Will be required.

Therefore, when performing single-sided printing in a printing apparatus capable of double-sided printing, as described above, unprinted printing paper is fed out to the plate cylinder facing the back side of the printing surface. You must set the non-printable state. Therefore, when single-sided printing is selected, it is necessary to replace the printing base paper wound around the plate cylinder one by one.

When single-sided printing is selected, if printing is performed without knowing that an unmade printing base paper is wound around the plate cylinder on the side corresponding to the printing side, A printing error may be found after printing, and the printing paper may be wastefully consumed.

Therefore, in view of the above-mentioned problems in the conventional printing apparatus, it is an object of the present invention to provide a printing apparatus having a structure capable of double-sided printing with a simple structure.

It is a further object of the present invention that when the state of double-sided printing is switched to single-sided printing,
Supplying unprinted printing base paper to the non-printing side, wasteful consumption of the printing base paper at the time of this supply, and wasteful consumption of printing paper when the wrong printing side is selected An object of the present invention is to provide a printing device having a structure capable of performing the above.

[0018]

In order to achieve this object, the invention according to claim 1 is provided with an ink supply mechanism inside, and a front end of a printing base paper corresponding to a plate is divided by dividing a part in the circumferential direction. It is characterized in that at least one pair of rotatable porous cylindrical plate cylinders, which are formed with a superposed portion which can be contacted and separated for sandwiching, are arranged so as to face each other.

The invention according to claim 2 is characterized in that opposing cylindrical plate cylinders are connected to each other at their rotary driving parts by an up-and-down moving device, and the up-and-down moving device is constituted by a gear train. .

The invention according to claim 3 is characterized in that the gear train of the up-and-down moving device is set such that the number of teeth of adjacent gears is the same or an integral multiple.

According to a fourth aspect of the present invention, one of the divided portions of the overlapping portion is located on the outer diameter line of the cylindrical plate cylinder, and accordingly, the cylindrical plate cylinders are slightly separated from each other from the outer peripheral surface thereof. It is characterized by being placed in a different position.

The invention according to claim 5 is characterized in that the cylindrical plate cylinders are set so as to continuously press each other while the printing paper is being fed.

According to a sixth aspect of the present invention, an ink supply mechanism is provided inside, and a superposed portion that can be brought into contact with and separated from is divided so as to sandwich a front end of a printing base paper corresponding to a plate by dividing a part in the circumferential direction. A printing apparatus in which at least one set of rotatable porous cylindrical plate cylinders are arranged so as to face each other, and the printing base paper is fed to each plate cylinder in accordance with the number of the cylindrical plate cylinders, and the printing is performed. A plurality of plate-making devices for setting plate making or non-plate making, and a means for selecting the printing state on the front and back surfaces of the printing paper by selecting the plate cylinders facing the front and back surfaces of the printing paper; A plate discharging unit for removing the printing base paper mounted on the cylinder and a unit for selecting the printing state are connected to the input side, and the plate making apparatus and the plate discharging apparatus are connected to the output side, and Cylindrical plate cylinder for single-sided printing A control unit that sets the position of the plate making apparatus so as to feed out the unprinted printing base paper to one side, and the control unit, when single-sided printing is selected, controls the plate cylinder facing the back surface of the corresponding printing surface. The unprinted printing base paper is fed to the side, and when the unprinted printing base paper is wound, the printing base paper is discharged from the plate cylinder facing the back side until the printing conditions are changed. The feature is that the plate cylinders are pressed against each other so as not to exist.

According to a seventh aspect of the present invention, the control section is connected to the display section on the output side, and the plate is not made by a signal from the means for selecting the plate cylinder and selecting the printing state on each side of the printing paper. When it is determined that the cylindrical plate cylinder on the side where the printing base paper is not mounted is selected for printing, a warning signal is output to the display unit to indicate that single-sided printing is impossible. It has a feature.

According to an eighth aspect of the present invention, the control unit selects the plate cylinder to select a printing state on each of the front and back sides of the printing paper, and a side from which the unmade printing base paper is mounted by a signal from the means. When performing printing with the cylindrical plate cylinder of No. 1, switch to the plate making device for the cylindrical plate cylinder on the side opposite to the cylindrical plate cylinder that is equipped with this unmade printing base paper, and perform the plate making process according to the original image. It is characterized by outputting a signal for performing.

[0026]

According to the present invention, by sandwiching the leading end of the printing base paper in the overlapping portion formed in a part in the circumferential direction, the conventionally used clamp mechanism becomes unnecessary, and this clamp mechanism exists. Compared with the case, the plate cylinders facing each other can be brought closer to each other and brought into contact with each other at the time of printing.

According to the present invention, since the gear train is used in the up-and-down moving device, it is possible to prevent the up-and-down position from being displaced due to stretching or the like as in the case of using a belt or the like.

According to the present invention, the unprinted printing base paper can be mounted on one of the plate cylinders to press the plate cylinders against each other, so that one-sided printing can be performed on the printing paper.

According to the present invention, the printing conditions are changed when the unprinted printing base paper is wound around the plate cylinder which is opposed to the plate cylinder selected for single-sided printing but is circular. Until then, it is possible to maintain the state in which the unprinted printing base paper is wound, and to save the labor of winding the unprinted printing base paper each time single-sided printing is selected.

Further, according to the present invention, when the unprinted printing base paper is wound around the plate cylinder selected for single-sided printing, single-sided printing can be performed with the plate cylinder set in this condition. While warning that there is no printing plate, the printing base paper made by switching the operating state from the plate making device for this plate cylinder to the plate making device located on the plate cylinder side facing this plate cylinder It is possible to prevent the occurrence of a printing error due to.

[0031]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic view showing the structure of the essential part of the present invention. The feature of this embodiment is that a pair of cylindrical plate cylinders are arranged so as to face each other with an extremely small gap. .

That is, in the figure, reference numerals 1 and 10 denote the first and second plate cylinders, respectively.
The second plate cylinders 1 and 10 are arranged so as to face each other at a position where they can press the printing paper to be fed together. Since the plate cylinders 1 and 10 have the same structure, the first plate cylinder 1 will be described below as an example. Regarding the second plate cylinder 10, the first plate cylinder 1
10 is added to the reference numerals of the components used in FIG.

Although not shown in detail, the first plate cylinder 1 is based on a metal plate having a large number of holes in the area corresponding to the printing base paper winding portion in the circumferential direction and serving as an ink passage portion. On the outer surface thereof, a forward and backward rotatable cylindrical member having an ink permeable structure in which a screen layer made of, for example, polyester fiber is arranged, and a superposed portion 1A is provided at a part in the circumferential direction. . This overlapping portion 1A is
The peripheral wall of the plate cylinder 1 is divided, and the divided one 1A1 is positioned on the circumference of the regular diameter of the first plate cylinder 1,
The other divided 1A2 has a circumferential length longer than that of the divided position and has the same diameter as the diameter of the first plate cylinder 1, and the leading end is located inside the one 1A1. Therefore, since the other divided 1A2 is in a state in which the diameter is contracted at a position facing the divided one 1A1, it stores the bending force for returning to the normal diameter, and in FIG.
As shown by the chain double-dashed line, for example, the other divided 1A1,
By pushing 10A1 open, a space into which the front end of the printing base paper can be inserted can be formed. Further, since the divided other 1A2 is given the habit of closely adhering to the inside of the one 1A1 by the bending force, the divided one 1A2 is divided by releasing the opening after inserting the front end of the printing base paper.
The leading edge of the printing base paper is clamped together with A1 and 10A1.

On the other hand, an ink supply unit 2 is arranged inside the first plate cylinder 1, and the ink supply unit 2 approaches or abuts on the inner peripheral surface of the first plate cylinder 1 to form a first ink. It is provided with an ink supply roller 2A capable of interlocking with the plate cylinder 1 and a doctor roller 2B fixed in close proximity to the ink supply roller 2A with a predetermined gap. In the ink supply unit 2, for example, the ink discharged from the ink supply pipe 2C provided on the support shaft of the first plate cylinder 1 is formed at the position facing the ink supply roller 2A and the doctor roller 2B. After being accumulated in a pool and kneaded by both of these rollers, the kneaded ink is conveyed by an ink supply roller 2A to a position where it and the first plate cylinder 1 face each other.

In the vicinity of the peripheral surface of the first plate cylinder 1, the first plate-making device 3 and the first peeling claw 5 for peeling the paper are provided.
Further, a second plate making device 13 and a second peeling claw 14 are arranged near the peripheral surface of the second plate cylinder 10, respectively.

Although not shown in detail, the first and second plate making apparatuses 3 and 13 accommodate, for example, a roll-shaped printing base paper, and an original image is formed on the printing base paper by a thermal head and a platen roller. It is designed to be drilled accordingly. Then, the first and second plate making devices 3 and 13
The plate-making state and the plate-making state are respectively set by a signal from the control section. The control unit will be described later.

Further, the first and second peeling claws 4, 14
Is fixed with the leading end positioned at a position separated from the peripheral surface of the first plate cylinder 1 by a predetermined gap. The predetermined gap is an extremely small gap in consideration of the absence of a member corresponding to the clamp mechanism E shown in FIG. In FIG. 1, reference numeral 5 indicates a paper discharge tray, reference numeral 6 indicates a paper feeding device that can feed the printing paper, and the printing paper fed from the paper feeding device 6 is an image position on the plate cylinder. The registration roller 6A is used to set the alignment with the sheet, and the sheet is fed toward the plate cylinder.

On the other hand, the first and second plate cylinders 1 and 10 are rotationally driven by the structure shown in FIG.

The first and second plate cylinders 1 and 10 described above include
The first plate cylinder gear 7 and the second plate cylinder gear 17 are integrated with the supporting shafts that support them. A drive gear 18A fixed to the output shaft of the drive motor 18 meshes with the second plate cylinder gear among the plate cylinder gears, and
The plate cylinder gear 7 and the second plate cylinder gear 17 are provided with idle gears 19 that mesh with each other. Second plate cylinder 10
Is provided so that it can rotate only without being displaced by a support portion of a printing device (not shown).
A can always mesh with the second plate cylinder gear 17.

The idle gear 19 is composed of the first and second plate cylinders 1,
It is possible to roll around the first and second plate cylinder gears 7 and 17 via the first connecting arm 20 and the second connecting arm 21 that are rotatably attached by the support shaft of 10. The idle gears 19 can be linked with each other by a connecting link 22. In addition, of the first and second connecting arms 20 and 21,
One end of a moving rod 23 is attached to the second connecting arm 21 located on the side of the second plate cylinder gear 17, and the idle gear 19 is rotated on the second plate cylinder gear 21 by moving this end in the arrow direction. It can be moved. Therefore, the gear train including these gears constitutes a planetary gear mechanism, and the number of teeth between the gears is set to be the same as that of the adjacent gears or set to an integral multiple relationship, as shown in FIG. The number of gear teeth in the gear train is, for example, idle gear 1
9 have the same number of teeth, and the first and second plate cylinder gears 7 and 17 have the same number of teeth and the idle gear 1
It is set to an integral multiple of 9 teeth.

The first and second planetary gear mechanisms are used.
The rotary drive mechanism for the plate cylinders 1 and 10 constitutes an upside-down movement device having a function of adjusting the phase between the first and second plate cylinders. That is, when the moving rod 23 is displaced, the idle gear 19 meshing with the second plate cylinder gear 21 rolls according to the displacement amount.
Is transmitted to the idle gear 19 meshing with the first plate cylinder gear 6, and the first plate cylinder gear 6 rotates through the rotation of the idle gear 19. Since the phase of the other plate cylinder can be adjusted with respect to the phase of the one plate cylinder, the printing start position can be matched between the first and the second plate cylinders. Further, rotation transmission between the first and second plate cylinders 1 and 10 having the printing start position set in this way is performed between the idle gears 19 and between the idle gear 19 and the first and second idle gears 19.
The meshing with the second plate cylinder gear is set so that the same teeth mesh with each other at the same position. Therefore, if the ratio of the number of teeth is, for example, 1: 1, the same teeth always mesh with each other, and
If it is 1: 2 or 1: 3, the same teeth will mesh with each other every two or three revolutions. Even if the meshing accuracy including the gear machining accuracy is poor, the first and second plate cylinders It is possible to obtain a state in which the relative positional relationship at does not change.

The first plate cylinder 1 with respect to the second plate cylinder 10 is
It is provided so that it can be moved in and out. For this reason, the support shaft of the first plate cylinder 1 is attached to the swinging end side of the swingable first plate cylinder arm 24 whose base end is supported by the immovable portion of the printing apparatus, and An eccentric cam 25 is arranged near the swinging end of the first plate cylinder arm 24, and the pressing spring 2 has the habit of pulling the second plate cylinder 10 side with respect to the eccentric cam 25.
The oscillating end of the first plate cylinder arm 24 comes into contact with the urging force of 6. The eccentric cam 25 is provided to bring the first plate cylinder 1 into contact with and separate from the second plate cylinder 10, and until the leading edge of the printing paper is clamped by the overlapping portions 1A and 10A of the plate cylinder. Separates the first plate cylinder 1 from the second plate cylinder 10 in a direction away from the second plate cylinder 10, and then brings the first plate cylinder 1 into contact with the second plate cylinder 10 when the leading edge of the printing paper is completely clamped. Rotate to displace in the direction.

On the other hand, the above-mentioned control unit has the configuration shown in FIG.

That is, the control section 27 is mainly composed of, for example, a microcomputer 27A,
On the input side via the I / O interface 27B, for example, a selection unit 28 for the printing surface of the printing paper, the first plate making device 3, the second plate making device 13, the first plate ejecting device 29, the second plate making device
Of the first plate making device 3 are connected to the output side of the plate discharging device 30 and the single-sided / double-sided printing selecting means 31.
The drive unit of the second plate making device, the drive units of the first and second plate discharge devices, the display unit 32, and the motor drive unit 33 are connected to each other. The printing surface selecting unit 28 and the single-sided / double-sided printing selecting unit 31 described above are members that select the plate cylinder used when printing on one side of the printing paper and select between the double-sided printing mode and the single-sided printing mode. And these choices are made by the operator.

The control unit 27 is a microcomputer 27.
A ROM 27C and a RAM 27D connected to A are provided, the ROM 27C stores a sequence program for a printing process, and the RAM 27D stores data necessary for the sequence program. RAM
In 27D, when the plate-made printing base paper in the first and second plate making apparatuses 3 and 13 is fed out, this state is taken in as data, and when the unmade plate-making print base paper is fed out. This state is taken in as data.

Then, in the control unit 27, the operating states of the first and second plate making apparatuses 3 and 13 are set by discriminating the one-sided / two-sided printing of the document and the plate cylinder to be used. Has become. In addition, for example, for double-sided printing, the first and second plate-making devices are fed from the first and second plate-making devices.
When it is determined that single-sided printing is selected when the printing base paper punched on the plate cylinders 1 and 10 is wound, it is wound on the plate cylinder corresponding to the non-printing side. The printing base paper is discharged, and a signal for feeding out the unprinted printing base paper from the plate making device is output to the plate cylinder.

Furthermore, when the fact that the above-mentioned unprinted printing base paper is wound is stored in the RAM 27D and printing is continuously performed under the same conditions as the one-sided printing executed before that, it is not Do not operate the plate-making device and plate-discharging device that are provided in correspondence with the plate cylinder on the side where the printing base paper for the plate making is wound, and leave the unprinted printing base paper that has been wound up to now as it is. It is designed to be used. This means that when a single-sided original is selected, the condition of continuous single-sided printing is the same as that of the single-sided printing executed before that, that is, without rewinding the unprocessed printing base paper one by one, that is, When the plate cylinder around which the unprinted printing base paper is wound is the same, the printing base paper of the plate making is used as it is, so that the consumption of the printing base paper is reduced.

Further, in the control unit 27, when performing single-sided printing, if the plate cylinders on which the unprinted printing base paper is to be wound are different, this state is warned by the display unit 32. ing.

By the way, in the case of single-sided printing, it is more advantageous to print an image on the front surface of the printing paper in order to confirm the printing state. For example, by mistake, in the case of single-sided printing, the back surface of the printing paper is When an instruction to wind the printing base paper is made by selecting the plate cylinder side opposite to, the image is printed on the back surface of the printing paper, which is a so-called printing error. Therefore, when the single-sided printing is selected, the control unit 27 instructs the front surface of the printing paper to be wound when the printing cylinder is instructed to be wound by the plate cylinder facing the back side of the printing paper. The operating state of the plate making device is switched so that the printing base paper made by the plate making device is fed to the opposite plate cylinder. As a result, in the case of single-sided printing, printing can be performed on the surface of the printing paper, which is the easily visible side.

Next, the operation will be described. FIG. 4 is a flow chart for explaining the procedure of the printing operation executed by the control unit 27. In the flowchart shown in FIG. 4, the first plate cylinder 1 corresponds to the plate cylinder facing the front surface of the printing paper in single-sided printing, and the second plate cylinder faces the back surface of the printing surface. The case 10 will be described as an example. In the figure, the control unit 27 determines whether or not double-sided printing is performed based on the presence / absence of a signal from the printing surface selection unit 28 and the signal from the single-sided / double-sided printing selection unit 31 (ST1). In this determination, when the one-sided printing is performed, the signal from the printing surface selection unit 28 is input.
In the case of double-sided printing, the first and second plate cylinders 1, 1
It is determined whether or not the printing base paper, which is the plate 0, is wound according to the plate making conditions from the first and second plate making apparatuses 3 and 13 (ST2). The plate making status in each of the plate making apparatuses 3 and 13 used for this judgment is the contents judged by this data because the data corresponding to whether or not the plate making process has been performed at this stage is registered in the RAM 27D. When the preprinted printing base paper is wound around the first and second plate cylinders 1 and 10, the plate discharge processing of the printing base paper is performed (ST3), and further, according to the new image, the first, In the second plate making apparatus 3 and 13, perforation processing is performed to make a plate, and at the same time, the printing base paper subjected to the plate making is fed (ST4, ST5).

On the other hand, by rotating the eccentric cam 25 in accordance with the feeding of the printing base paper, the first plate cylinder arm 2
4 is swung in the direction in which the first plate cylinder 1 is separated from the second plate cylinder 10 (ST6). In this state, the overlapping portion 1 of the first and second plate cylinders 1 and 10 is provided by means not shown.
The other divided 1A2 and 10A2 of A and 10A are pushed open to form a space for inserting the leading end of the printing paper (ST7). The opening at the overlapping portion is maintained until the leading end of the printing base paper is completely inserted, and the rotation amount of the drive motor used for feeding out whether the insertion of the leading end of the printing base paper is completed, etc. Determined by the information of
(ST8). When the front end of the printing base paper is completely inserted into the overlapping portions 1A and 10A, the first plate cylinder 1 is moved to the first plate cylinder arm 24 as the eccentric cam 25 returns to the initial position.
The state in which the second plate cylinder 10 can be brought into contact with the second plate cylinder 10 is set by the swing return of the second plate cylinder, and the second plate cylinder gear 17 is rotationally driven by the drive motor 18 at this point (ST9). And
When the printing base paper is wound in this manner, the printing paper is fed and discharged as in the normal printing operation, and thus the operation control of the peeling claws 4 and 14 is executed. ST10).

If it is determined in step (ST1) that the printing is not double-sided printing, it means single-sided printing. In this single-sided printing, it is determined whether the printing is on the front surface of the printing paper (ST11). ). As described above, this determination is performed because it is convenient to perform printing on the front surface of the printing paper when checking the printing status. For example, in the operation panel, the single-sided printing mode is set. Selection of the plate cylinder to be used in accordance with the selection, that is, the first plate cylinder 1 facing the front side of the printing paper is used, or the second plate cylinder 1 facing the back side of the printing paper is used.
It is determined according to the selection situation of whether to use 0.

When it is instructed to set the original for printing on the front surface, that is, to use the first plate cylinder 1, the second plate cylinder 10 facing the back surface of the printing paper in FIG. It is determined whether or not the printing base paper wound around is an unmade plate (ST12). When the printing base paper wound on the second plate cylinder 10 is an unmade plate, the plate discharging process from the second plate cylinder 10 is stopped (ST13).
This is for saving the need to wind the unprinted printing base paper again when the unprinted printing base paper is already wound around the second plate cylinder 10. The printing base paper for plate making is maintained in a wound state until new printing conditions, that is, a state where the printing base paper which has been made as a plate is wound around the second plate cylinder. Then, in order to perform printing on the front surface of the printing paper, a plate discharge process from the first plate cylinder 1 is executed, a plate making process is performed by a punching process in the first plate making device 3, and a printing base paper is fed. (ST14 to ST16).

Further, for example, when the single-sided printing on the surface of the printing paper is selected but the unprinted printing base paper is not wound on the second plate cylinder 10, the display unit 32 is used.
A warning message is displayed at step 17 (ST17) to alert the operator that the print mode cannot be selected with the printing base paper wound on the plate cylinder at this stage, and the printing process is executed carelessly. In this case, waste of the printing base paper is avoided.

Further, when single-sided printing is selected and printing is not performed on the front surface of the printing paper, that is, because it is the front surface, it is erroneous that the first plate cylinder 1 should be selected. When an instruction to use the plate cylinder 10 of No. 1 is given, a warning is displayed that a plate cylinder that does not correspond to the front side printing is selected, and the first cylinder facing the front side is displayed.
The winding of the preprinted printing base paper on the plate cylinder 1 is set.

That is, in this case, the selected plate cylinder is not perforated by the plate-making apparatus, and the plate-making printing paper is fed to the first plate cylinder 1 facing the surface of the printing paper. Switching the operation of the device is performed. Therefore, in this case, it is determined whether or not the unprinted printing base paper is wound around the first plate cylinder 1, and when the unmade printing base paper is wound, the plate discharge of the printing base paper is performed. Processing is performed, and the printing base paper that has been subjected to the plate-making processing by the first plate-making device 3 is fed toward the first plate cylinder 1 (ST18 to S
T22). In this case, it is assumed that the unprinted printing base paper is wound around the second plate cylinder, and if the unmade printing base paper is not wound, the printing base paper is discharged. Then, the process of winding the unmade printing base paper is executed.

According to the present embodiment described above, the rotation transmission from the second plate cylinder gear 17 to the first plate cylinder gear 7 does not use a belt or the like having a change in elongation, and the gear train is not used. By multiplying the number of teeth of the gear of
Since it is possible to always obtain the same meshing of teeth without causing a phase shift, it is possible to prevent the shift of the image leading end position between the first and second plate cylinders.

[0059]

As described above, according to the present invention, when printing is performed on both front and back surfaces of printing paper with the plate cylinders facing each other,
Since the overlapping portion is formed on the peripheral wall of the plate cylinder to be used as the clamp mechanism, the member protruding from the surface of the plate cylinder can be eliminated. Therefore, the facing distance between the facing plate cylinders can be made extremely small, which makes it possible to reduce the moving stroke at the time of pressing and reduce the impact noise.

In addition, since the moving stroke can be made small, it is not necessary to make the rigidity to be the same, but it is possible to prevent the weight of the apparatus including the plate cylinder from increasing.

Further, according to the present invention, when single-sided printing is selected in a state where double-sided printing can be performed, one plate cylinder, that is, the plate cylinder opposite to the non-printing surface, is not preprinted. When the single-sided printing is selected and the unprinted printing base paper is wound on the plate cylinder facing the non-printing surface at this stage, the printing base paper of Since the unprinted printing base paper is not wound, wasteful consumption of the printing base paper can be prevented.

Further, according to the present invention, when single-sided printing is selected, when an unmade printing base paper is wound around the plate cylinder facing the surface to be printed, this state is displayed as a warning. It is possible to prevent wasteful printing, and when the unprinted printing base paper is wound, especially when the plate cylinder facing the back side of the printing paper is selected, When unprinted printing base paper is wound, it is possible to switch the operating status of the plate making device so that the printing base paper is fed to the plate cylinder facing the surface of the printing paper. Can be prevented.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing a main configuration of a printing apparatus according to the present invention.

FIG. 2 is a schematic diagram for explaining the configuration of a drive system used in the configuration of the main part shown in FIG.

FIG. 3 is a block diagram for explaining a configuration of a control unit used in the configuration of the user unit shown in FIG.

FIG. 4 is a flowchart for explaining the operation of the control unit shown in FIG.

5 is a flowchart for explaining a continuous part of the flowchart shown in FIG.

FIG. 6 is a schematic diagram showing a conventional example around a plate cylinder portion in a printing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st plate cylinder 1A Overlapping part 1A1 One of the divided overlapping parts 1A2 The other of the divided overlapping parts 3 1st plate making device 4 Separation claw 10 2nd plate cylinder 10A Overlapping part 10A1 Of the overlapping overlapping parts One 10A2 The other one of the divided overlapping parts 13 Second plate making device 16 First plate cylinder gear 17 which is a part of the up-and-down moving device 17 Second plate cylinder gear 18 which is a part of the up-and-down moving device 18 Drive motor 19 Up-and-down moving device An idle gear 24 that forms a part of the first plate cylinder arm 25 an eccentric cam 27 a control unit 28 a document reading unit 29 a first plate ejection device 30 a second plate ejection device 32 a display unit

Claims (8)

[Claims] 1. A rotatable porous body which is provided with an ink supply mechanism inside thereof and is formed with a superposed portion which can be brought into contact with and separated from in order to hold a front end of a printing base paper corresponding to a plate by dividing a part in a circumferential direction. A printing apparatus, in which at least one pair of flexible cylindrical plate cylinders are arranged so as to face each other. 2. The printing apparatus according to claim 1, wherein the cylindrical cylinders facing each other have their rotational driving units connected to each other by a vertical movement device, and the vertical movement device is constituted by a gear train. 3. The printing device according to claim 2, wherein the gear trains of the up-and-down movement device are set such that the number of teeth of adjacent gears is the same or an integer multiple. 4. The printing apparatus according to claim 1, wherein one of the divided portions is located on the outer diameter line of the cylindrical plate cylinder, and in accordance with this, the cylindrical plate cylinders are more than the outer peripheral surface thereof. A printing device that is located slightly apart. 5. The printing device according to claim 1, wherein the cylindrical plate cylinders are set to be continuously pressed against each other while the printing paper is being fed. 6. A rotatable porous body which is provided with an ink supply mechanism inside, and is formed with a superposed portion which can be brought into contact with and separated from the peripheral portion of the printing base paper corresponding to a plate by dividing a part in the circumferential direction. A printing device in which at least one set of cylindrical plate cylinders are arranged so as to face each other, and the printing base paper is fed to each plate cylinder in accordance with the number of the above-mentioned cylindrical plate cylinders, and a plate-making or unmaking plate of the printing base paper to be fed out. Setting means, a means for selecting the printing state on each of the front and back sides of the printing paper by selecting the printing cylinders facing the front and back sides of the printing paper, and mounted on the cylindrical printing cylinder. The plate discharge means for eliminating the printing base paper and the means for selecting the printing state are connected to the input side, the plate making device and the plate discharge device are connected to the output side, and in the case of single-sided printing of the original. One of the above cylindrical plate cylinders And a control unit for setting the position of the plate-making device so as to feed out the printing base paper, and when single-sided printing is selected, the control unit prints an unprinted plate on the plate cylinder side facing the back surface of the corresponding printing surface. In addition to unwinding the base paper, if an unmade printing base paper is wound,
A printing apparatus which presses the printing cylinders so that the printing base paper is not discharged from the printing cylinders facing the back surface until the printing conditions are changed. 7. The printing apparatus according to claim 6, wherein the control unit has a display unit connected to the output side, and a signal from a unit for selecting a plate cylinder and a printing state on each of the front and back sides of the printing paper. , When it is determined that the cylindrical plate cylinder on the side where the unprinted printing base paper is not mounted is selected for printing, a warning signal is output to the display unit to indicate that single-sided printing is impossible. The printing device to display. 8. The printing apparatus according to claim 7, wherein the control section mounts the unprocessed printing base paper in response to a signal from the means for selecting the plate cylinder and selecting the printing state on each of the front and back surfaces of the printing paper. When performing printing with the cylindrical plate cylinder on the side that is mounted, switch to the plate-making device for the cylindrical plate cylinder on the side opposite to the cylindrical plate cylinder that is equipped with this unprinted printing base paper, and respond to the original image. A printing device that outputs a signal for performing plate making processing.