JP3294364B2 - Stencil printing machine with plate making function - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a stencil printing apparatus having a plate making function, and more particularly to a stencil printing apparatus having a plate making function including a plate cylinder having an ink passing structure.

[0002]

2. Description of the Related Art As a stencil printing machine with a stencil making function, a stencil making means for making a stencil on a stencil sheet, and a stencil sheet made by the stencil making means are wound around an outer peripheral surface thereof and are provided with an ink squeezing mechanism in an inner cylindrical portion. A plate cylinder having an ink passage structure that is driven to rotate around its own central axis, a printing ink supply unit that supplies printing ink to the ink squeezing mechanism, and a stencil sheet that is wound and mounted on the outer peripheral surface of the plate cylinder. A press roller for pressing the printing paper, and a paper feeding unit for supplying the printing paper one by one between the plate cylinder and the press roller, and a stencil printing start button provided on the operation panel is operated by the user. Thereby, the stencil sheet is stencil-made by the stencil making means, and the stencil sheet having the stencil wrapped around the outer peripheral surface is mounted thereon. A stencil printing apparatus with a stencil making function configured to automatically perform stencil printing on printing paper by operating the press roller and the paper feeding unit is already known, for example, Japanese Patent Publication No. Sho 62-30117. It is indicated in the gazette.

[0003]

In the stencil printing apparatus with the stencil making function described above, the printing ink is pushed into the ink-permeable porous structure by the ink squeezing mechanism from the inner peripheral side of the plate cylinder. The printing cylinder is impregnated with the required volume of printing ink in the part and stencil printing is performed by bleeding the printing ink on the outer peripheral surface of the printing cylinder, that is, the stencil sheet mounting surface. In order for the cylinder to impregnate the required volume of printing ink in the porous structure, it is necessary to make a break-in to adapt the printing ink to the plate cylinder.

This break-in is started by operating a stencil printing start button. In the normal printing mode as described above, a non-perforated stencil sheet is wrapped around the outer peripheral surface by stencil making with a blank document, and is mounted. Can be performed by rotating the printing ink supply means, the press roller, and the paper supply means over a predetermined time, but in this case, the paper supply means also operates as usual, and Since the paper is fed, the printing paper may be wasted, and forcing the user to perform these special operations increases the burden on the user and reduces the operability of the stencil printing apparatus with a stencil making function. .

[0005] For this reason, conventionally, break-in of a plate cylinder is generally performed by a dedicated machine or the like at a factory of a manufacturer.
However, if the plate cylinder breaks in at the manufacturer and this is left in stock for a long period of time, the printing ink deteriorates due to the aging of the printing ink, and the plate cylinder is included during shipping and sales. The performance of certain printing inks may be reduced.

[0006] In particular, a dedicated plate cylinder is prepared for each color for changing colors and the like, and as shown in Japanese Patent Publication No. 62-28758, the plate cylinder can be exchanged with respect to the printing apparatus main body in a cartridge type. When the printer is installed, if the stock cylinder of each color that has been broken in is kept in stock so that the dealer can immediately deliver the cylinders of each color, the plate cylinders can be left for a long period due to unsold products. The possibility that the printing ink contained in the plate cylinder at the time of shipment and sale is already deteriorated is increased.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and requires no special machine, troublesome operation, and wasteful consumption of printing paper, and the break-in of the plate cylinder can be provided to the user. It is an object of the present invention to provide a stencil printing machine with a stencil making function, which is improved so that it can be easily carried out at a delivery stage and eliminates the adverse effects of early break-in regardless of the period of leaving the printing drum in a store or the like.

[0008]

According to the present invention, there is provided a stencil making means for making a stencil on a stencil sheet, and a stencil sheet produced by the stencil making means is wound around an outer peripheral surface of the stencil sheet. A plate cylinder having an ink passage structure which has an ink squeezing mechanism and is driven to rotate around its own central axis,
Said ink squeegeeing mechanism of the ink reservoir is metered printing ink supply means printing ink to the unit, the ink
Checks whether the printing ink volume in the pool is more than a predetermined value.
Detected and turned off when the printing ink volume is less than the specified value
An ink amount sensor for outputting a signal, a press roller for pressing a printing sheet against a stencil wrapped around the outer peripheral surface of the plate cylinder, and a sheet of printing paper supplied one by one between the plate cylinder and the press roller In a stencil printing apparatus with a stencil making function having a supply means, a mode setting operation means for selectively setting a normal printing mode and a break-in mode,
When a normal printing mode is set, the stencil sheet is stencil-made by the stencil making means, and the stencil sheet having the stencil wrapped around the outer peripheral surface is mounted thereon, and the printing cylinder is rotated to drive the printing ink supply means and the press. roller, the supply means each is operated through a series of control for stencil printing on the printing paper, there when the break-in mode is set
And, when the output of the ink amount sensor is an OFF signal , the unprinted stencil sheet is wound around the outer peripheral surface of the plate cylinder and mounted, and the plate cylinder is rotationally driven to drive the printing ink supply means and A stencil printing apparatus with a stencil making function, comprising: control means for operating the press roller to adjust the printing ink to the plate cylinder.

[0009]

According to the above configuration, when the normal print mode is set, the same normal stencil printing as in the related art is performed. On the other hand, when the break-in mode is set,
An unprinted stencil sheet is wound around the outer circumference of the plate cylinder and installed.
The operation of rotating the plate cylinder to operate the printing ink supply means and the press roller to adapt the printing ink to the plate cylinder, that is, the break-in of the plate cylinder is automatically performed by a normal machine.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 shows an embodiment of a stencil printing apparatus having a stencil making function according to the present invention. A stencil printing apparatus with a plate making function includes a document reading unit 11, a plate making unit 13, a printing unit 1
5 is provided.

An original reading unit 11 is an image scanner.
And has a line image sensor 17 for reading an image of a document conveyed in the sub-scanning direction, and a document feed roller (platen roller) 19 for conveying the document in the sub-scanning direction.

The plate making section 13 includes a base paper roll section 21, a thermal head 23 composed of a plurality of point heating elements arranged in a row, a base paper feed roller (platen roller) 25, and a base paper feed roller 27. , Stencil guide rollers 29, 31, 33, and stencil cutter 35, and a plurality of dot heating elements of the thermal head 23 selectively and individually generate heat, thereby forming dots on the heat-sensitive stencil sheet M. performs thermal perforation plate making in-matrix, and performs the cutting of the stencil sheet M after plate-making by stencil cutter 35.

The printing unit 15 has an ink-permeable plate cylinder 37 of a porous structure which is driven to rotate counterclockwise in the figure around its own central axis, and the plate cylinder 37 has a stencil clamping device on its outer periphery. The stencil sheet M is wound around the stencil sheet M by clamping the leading end of the stencil sheet M by the stencil clamping device 39. It should be noted that the plate cylinder 37 is attached to the base paper
Only the printing effective area excluding the arrangement portion 9 has a porous structure.

A squeegee roller 41 is disposed in the plate cylinder 37 so as to be rotatable about its own central axis, and is in sliding contact with the inner peripheral surface of the plate cylinder 37. An ink squeezing mechanism is provided by a doctor roller 45 forming an ink reservoir 43 together with the ink roller 41.

In the plate cylinder 37, an ink bottle 47 as an ink supply source is replaceably arranged. The printing ink in the ink bottle 47 is sucked out by an ink supply pump 49 and is stored in an ink reservoir by a delivery pipe 51. 43
Sent out to

The ink sump 43 includes an ink sump 4
3 is provided with an ink amount sensor 53 for detecting whether or not the capacity of the printing ink is equal to or more than a predetermined value. The ink amount sensor 53 outputs a signal indicating a detection result to a control system described later. This ink amount sensor 53 is a 3-283
No. 42, it may be of a capacitance type.

A press roller 55 is provided below the plate cylinder 37. The press roller 55 is moved up and down substantially in synchronization with the rotation of the plate cylinder 37 by a cam mechanism (not shown). Plate cylinder 3 in the range corresponding to the porous structure area of
7 presses the printing paper P against the stencil sheet M wound and mounted on the outer peripheral surface of the printing paper P.

On one side of the printing unit 15, a paper feeding unit 57 is provided.
On the other side of the printing unit 15, a paper discharging unit 65 is provided.

The paper supply section 57 includes a paper supply table 59 on which the print papers P are stacked and placed, a pickup roller 61 for taking out the print papers P one by one from the paper supply table 59, and a print cylinder P with the plate cylinder 37. A timing roller 63 is provided between the press roller 55 and the press roller 55 at a predetermined timing.

The paper discharge section 65 includes a stripping claw 67 for peeling the printing paper P from the plate cylinder 37, a paper discharge feed belt section 69,
And a discharge tray 71 on which printed printing papers are stacked.

On one side of the printing unit 15, there is provided a plate discharging unit 77 including a plate discharging roller 75 for peeling the used stencil sheet M from the plate cylinder 37 and sending it into the plate discharging box 73.

[0023] Figure 2 shows an embodiment of a control system of consisting such above configuration prepress function stencil printer. This control system is composed of a C
A PU 81, a ROM 83 storing a control program,
A RAM 85 for storing input information and the like as needed, and receives the ink amount sensor 53, other various sensors (not shown), signals output from switches, and signals from key operation of the operation panel 87, and inputs the original reading unit 11, An operation command is output to each of the plate making unit 13, the printing unit 15, the sheet feeding unit 57, the sheet discharging unit 65, and the plate discharging unit 77.

The CPU 81 inputs information on whether or not the printing ink volume in the ink reservoir 43 is equal to or larger than a predetermined value from the ink amount sensor 53. And outputs a command to drive the drive motor 49m of the ink supply pump 49. When the capacity of the printing ink in the ink reservoir 43 is equal to or more than a predetermined value, the drive motor 49m of the ink supply pump 49 is stopped. Is output. Thus, the operation of the ink supply pump 49 is controlled in accordance with the volume of the printing ink in the ink reservoir 43, and the printing ink is metered and supplied to the ink reservoir 43 by the ink supply pump 49. Note that this ink supply control is effectively performed only when the plate cylinder 37 is driven to rotate and the squeegee roller 41 is rotated accordingly.

The operation panel 87 is provided with a mode setting key 93 for selecting and setting a normal print mode and a break-in mode, in addition to the plate making print start key 89 and the number of prints setting key 91. Represents a mode setting operation means operated by the user.

The CPU 81 executes a control program,
Basically, when the normal print mode is set by the mode setting key 93, the original image is read by the original reading section 11, and the stencil sheet M is made by the stencil section 13 based on the original image. The finished stencil sheet M is wound around the outer peripheral surface and mounted, and the plate cylinder 37 is rotationally driven by the main motor 37m to operate the press roller 55, the paper supply unit 57, and the paper discharge unit 65 to perform stencil printing on the printing paper P. When the break-in mode is set, a series of controls to be performed are performed.
The stencil sheet M, which is not made, is wound around the outer peripheral surface of the plate cylinder 37 by mounting the stencils 5 and 27, and the stencil sheet 37 is attached to the main motor 37.
By controlling the rotation of m, the ink supply pump 49 and the press roller 55 are operated to control the printing ink to adapt to the plate cylinder 37.

FIG. 3 shows an operation flow of the stencil printing machine with a stencil making function according to the present invention. In this operation flow, it is first determined whether or not the break-in mode is set by the mode setting key 93 (step 10).
If the mode is not the break-in mode, it is determined whether or not the normal print mode is set by the mode setting key 93 (step 20).

If the normal print mode has been set, it is monitored that the plate making print start key 89 is operated next (step 30). If the plate making print start key 89 is operated, the plate discharge section 77 is operated. Then, the used stencil sheet M mounted on the plate cylinder 37 is peeled off from the plate cylinder 37, and a plate discharging process for discarding and transporting it into the plate discharging box 73 is performed (step 40). Is read, and a document reading / plate making process for making a plate on the stencil sheet M is performed by the plate making section 13 based on the document image (step 50).

Next, the perforated stencil sheet M is sent to the plate cylinder 37 by the stencil feed rollers 25 and 27, and the leading end of the stencil sheet M is clamped by the stencil clamping device 39. After the clamping of the stencil sheet M is completed, the main motor 37m , The rotation of the plate cylinder 37 is started, and a stencil sheet M is wound around the outer peripheral surface of the plate cylinder 37 to perform a plate-making process (step 60). Incidentally, in the stencil sheet M is a predetermined length in the stencil loading process Hara
The paper is cut by the paper cutter 35.

When the printing is completed, the press roller 55, the paper feeding unit 57, and the paper discharging unit 65 are each operated in a predetermined manner under the rotational driving of the printing drum 37 by the main motor 37m, and the printing paper P is formed. The normal printing process for performing stencil printing is performed in the same manner as in the related art (step 70). This normal printing process is continued until the printing of the number of prints set by the number-of-prints setting key 91 is completed, and when the printing of the number of prints is completed, the printing operation is stopped (steps 80 and 90).

In this normal printing process, the ink amount sensor 53 monitors the volume of the printing ink in the ink reservoir 43, and the printing of the ink reservoir 43 detected by the ink amount sensor 53 is performed in the same manner as in the related art. The drive of the ink supply pump 49 by the drive motor 49m is controlled according to the amount of ink, and the amount of printing ink in the ink reservoir 43 is maintained at an appropriate value.

When the break-in mode is set, it is first determined whether or not the output signal of the ink amount sensor 53 is ON, that is, whether or not the amount of printing ink in the ink reservoir 43 is equal to or more than a predetermined value. (Step 100). When the output signal of the ink amount sensor 53 is on, that is, when the volume of the printing ink in the ink reservoir 43 is equal to or more than a predetermined value, the break-in has already been performed and it is not necessary to perform the break-in again. Cancel the in-mode setting.

On the other hand, if the output signal of the ink amount sensor 53 is not on, it is monitored that the prepress printing start key 89 is operated next (step 110). Thermal head 23
While the operation is stopped, the unstenciled stencil sheet M is sent to the plate cylinder 37 by the stencil feed rollers 25 and 27, and the leading end of the stencil sheet M is clamped by the stencil clamping device 39. The rotation of the plate cylinder 37 is started by the motor 37m, and the stencil sheet M is wound around the outer peripheral surface of the plate cylinder 37 to perform a stencil printing process (step 12).
0). It should be noted that the stencil sheet M is also cut by the stencil cutter 35 at a predetermined length in this plate-making process.

When the printing is completed, the press roller 55 is operated under the rotational drive of the printing drum 37 by the main motor 37m. At this time, the paper feed unit 57 and the paper discharge unit 65 are not operated, and no paper is fed. Accordingly, the press roller 55 is pressed against the unperforated stencil sheet M wound around and mounted on the outer peripheral surface of the plate cylinder 37. Further, since the stencil sheet M which has not been made is wound around the outer peripheral surface of the plate cylinder 37 and mounted, the ink amount sensor 53 is turned on by the ink reservoir 4.
At the start of the break-in, there is no printing ink in the ink reservoir 43, so the ink amount sensor 53 outputs an OFF signal. Thus, at the start of the break-in, the ink supply pump 49 is driven by the drive motor 49m, and the printing ink in the ink bottle 47 is supplied to the ink reservoir 43 (step 130).

The printing ink supplied to the ink reservoir 43 is sent to the inner peripheral surface of the plate cylinder 37 by the squeegee roller 41, and the printing cylinder 3 is moved while the press roller 55 is operating.
7 by squeezing.

The ink amount sensor 53 continuously monitors the amount of printing ink in the ink reservoir 43 (step 14).
0) When the required volume of the printing ink is impregnated into the porous structure portion of the plate cylinder 37, the ink volume of the ink reservoir 43 increases thereafter, and the ink volume of the ink reservoir 43 increases to a predetermined value. Then, the drive of the ink supply pump 49 by the drive motor 49m is stopped, the rotation of the plate cylinder 37 by the main motor 37m is stopped, and the operation of the press roller 55 is stopped, thereby completing the break-in (step 150).

[0037]

Although the present invention has been described in detail with reference to specific embodiments, the present invention is not limited to these embodiments, and various embodiments can be made within the scope of the present invention. Some will be apparent to those skilled in the art.

[0039]

As can be understood from the above description, according to the stencil printing apparatus with a stencil making function according to the present invention, when the break-in mode is set, the unstenciled stencil sheet is wound around the outer peripheral surface of the plate cylinder. The break-in for rotating the plate cylinder to operate the printing ink supply means and the press roller to adapt the printing ink to the plate cylinder is automatically performed by a normally used machine. It is possible to easily perform the break-in of the plate cylinder immediately before the start of actual use at the user without the need for operation and wasteful consumption of the printing paper. This avoids the adverse effects of early break-in, regardless of the length of time the plate cylinder is left in a store or the like. In addition, the break-in of the plate cylinder is performed without adding special parts and devices in a normal stencil printing machine with a stencil making function for performing normal printing,
It is convenient.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of a stencil printing apparatus with a plate making function according to the present invention.

FIG. 2 is a schematic configuration diagram showing one embodiment of a control system of the stencil printing apparatus with a plate making function according to the present invention.

FIG. 3 is a flowchart showing an operation flow of the stencil printing machine with a stencil making function according to the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 11 original reading section 13 plate making section 15 printing section 23 thermal head 35 stencil cutter 37 plate cylinder 41 squeegee roller 47 ink bottle 49 ink supply pump 53 ink amount sensor 55 press roller 57 paper feed section 65 paper discharge section 77 plate discharge section 81 CPU 87 Operation panel 93 Mode setting key

Claims (1)

(57) [Claims] 1. A stencil making means for making a stencil on a stencil paper, and a stencil paper made by the stencil making means is wound around an outer peripheral surface of the stencil paper. a plate cylinder of the ink passage structure to be, and the ink squeegeeing mechanism of the ink reservoir is metered printing ink supply means printing ink to the unit, the Lee
Whether the printing ink volume of the ink pool is more than a predetermined value
If the printing ink volume is less than the specified value,
An ink amount sensor that outputs an OFF signal, a press roller that presses printing paper against a stencil wrapped around the plate cylinder, and a sheet of printing paper supplied between the plate cylinder and the press roller one by one A stencil printing apparatus with a stencil making function, comprising: a mode setting operating means for selectively setting a normal printing mode and a break-in mode; and a stencil sheet by the stencil making means when the normal printing mode is set. The stencil sheet having the stencil made is wound around the outer peripheral surface and mounted, and the printing cylinder is rotationally driven to operate the printing ink supply means, the press roller, and the supply means to perform stencil printing on the printing paper. Performs a series of controls, and when the break-in mode is set ,
On the other hand, when the output of the ink amount sensor is an OFF signal , the unprinted stencil sheet is wound around the outer peripheral surface of the plate cylinder and mounted, and the plate cylinder is rotationally driven to operate the printing ink supply means and the press roller. A stencil printing machine with a stencil making function, comprising: control means for performing control for adjusting the printing ink to the plate cylinder.