JP3149059B2 - Stencil printing method and stencil printing machine - 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 method and a stencil printing machine, and more particularly to a rotary stencil printing method and a stencil printing machine in which set-off of printed matter is prevented.

[0002]

2. Description of the Related Art In a stencil printing machine, as shown in FIG. 3, a sheet discharge table 1 is pulled out of a main body and a side plate 2 is set to the width of a printing sheet. The printing paper discharged from the plate cylinder 3 at the time of printing is transported substantially horizontally to the upper end of the paper discharge tray along the guide plate 4, stopped by the upper stopper 5 shown in FIG. It is designed like. this is,
By using the height difference between the sheet discharge unit and the bottom surface of the sheet discharge table 1, it is possible to increase the time until the printing sheets overlap, thereby preventing the image from being rubbed or set off.

However, when the printing paper is large, when the printing paper is thin, or when the printing speed is slow, when the printing paper is accumulated on the paper output tray 1, the paper is stored on the paper output unit and the paper output tray 1. The height difference from the top surface of the printing paper is eliminated,
If the leading edge of the printing paper hangs down, the surface of the previously printed paper may be rubbed, resulting in an unclear image or stain on the back of the printing paper. As a method of solving this problem, there is a method of forming the shape of the paper discharge unit so that the print paper to be discharged is formed in a U shape.

[0004]

In the above-described method, when the number of printing papers on the paper discharge tray 1 is small, the leading end of the printing paper hangs down and the surface of the paper printed earlier is less rubbed. However, even when the leading end of the printing paper does not hang down, if the printing paper accumulates on the paper output tray 1, the paper output unit and the paper output tray 1
The height difference between the upper printing paper is eliminated, the time from when printing is performed to when the paper is overlapped is shortened, and the ink cannot be dried or penetrated until the ink does not set off, so that set-off occurs.

An object of the present invention is to solve the above-mentioned problems, and an object of the present invention is to provide a rotary stencil printing method and a stencil printing method which do not cause image rubbing or set-off even when printing paper is stored on a paper discharge tray. To provide a printing machine.

[0006] In the rotary stencil printing method, at the start of printing, the paper output tray is moved to the position where the leading edge of the discharged printing paper is already discharged.
Make sure that the printed paper is not rubbed so that it is at the highest position, calculate the number of prints at the start of printing, print until the specified number is reached, and discharge the specified number of sheets after calculation. The position of the paper tray is lowered by a specific amount, printing is performed again until the specific number of sheets is reached, and after calculating the specific number of sheets, the operation of lowering the position of the paper discharge tray again by a specific amount is repeated. In a rotary stencil printing method and a rotary stencil printing machine characterized in that printing can be interrupted when a position is detected, the discharge tray can be moved between upper and lower limits, and the number of printed sheets can be reduced. Depending on the paper output tray,
Make sure that the leading edge of the printed paper does not
Height so that it is at the highest position
The number of prints is calculated at the start of printing, and it becomes a specific number
A mechanism that prints up to the specified number of sheets, and then lowers the paper ejection tray by a specific position after calculating the specific number of sheets, a mechanism that starts printing when the paper ejection tray is at the upper limit and calculates the number of printed sheets, and a paper ejection tray A rotary stencil printing machine is provided which comprises a mechanism capable of detecting the lower limit and interrupting printing.

Next, the present invention will be described based on embodiments.
FIG. 1 is a block diagram showing an operation flow of the stencil printing method of the present invention, and FIG. 2 is a schematic view of a sheet discharge table of the stencil printing machine of the present invention. When the plate making start button on the operation panel (not shown) is pressed, first, it is checked whether or not the printing paper remains on the paper discharge tray. No printing paper remains in the normal state.

A counter (not shown) for counting the number of stored printing sheets is reset. At the same time, the motor 6 rotates so that the discharge tray reaches the upper limit, and the discharge tray upper / lower limit switch 13 is detected by the upper limit actuator 12. In this state, printing preparation is completed. When the print start button on the operation panel (not shown) is pressed and printing starts, a counter (not shown) that counts the number of stocked print sheets (not shown) starts counting in conjunction with a print number counter (not shown), The counter is 2
When it reaches 5, the motor 6 rotates and the set one step is lowered by 6 mm. If the upper / lower limit switch 13 is detected by the lower actuator 11, printing is interrupted.
A message is displayed on an operation panel (not shown). If not detected, this operation is repeated until printing is completed.

When the initially set number of prints is completed on an operation panel (not shown), the next time the plate making start button on the operation panel (not shown) is pressed, there is printing paper on the paper output tray. The counter for counting the number of stored printing papers (not shown) which is detected by the paper presence / absence sensor 14 waits until printing starts without being reset, and continues counting after printing starts.

The present embodiment is merely an example of the operation and structure, and any other structure can be used as long as the paper discharge tray moves up and down according to the number of prints stored in the paper discharge tray. Good.

[0011]

As is apparent from the above description, according to the present invention, even if the printing paper is stored in the paper discharge tray or the tip of the printing paper hangs down, the surface of the previously printed paper is rubbed. To provide a rotary stencil printing method and a rotary stencil printing machine in which the time from when printing is performed until the paper overlaps is always constant, so that image rubbing and set-off do not occur. Was completed.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating an operation flow of the present printing method.

FIG. 2 is an explanatory view showing an example of a lifting structure of a paper discharge table.

FIG. 3 is a schematic configuration diagram of a rotary stencil printing machine.

FIG. 4 is a schematic perspective view of a paper discharge tray.

[Description of References] 1 Discharge base 2 Side plate 3 Plate cylinder 4 Guide plate 5 Stopper 6 Motor 7 Worm gear 8 Worm wheel gear 9 Axis 10 Gear 11 Lower limit actuator 12 Upper limit actuator 13 Upper and lower limit switch of paper tray 14 Paper presence / absence sensor

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B65H 31/18 B41L 13/04 B65H 31/08

Claims (2)

(57) [Claims] In a rotary stencil printing method, at the start of printing, a discharge tray is set to a position where the leading end of the discharged printing paper is already discharged.
Make sure that the printed paper is not rubbed so that it is at the highest position, calculate the number of prints at the start of printing, print until the specified number is reached, and discharge the specified number of sheets after calculating. The position of the paper tray is lowered by a specific amount, printing is performed again until the specific number of sheets is reached, and after calculating the specific number of sheets, the operation of lowering the position of the paper discharge tray again by a specific amount is repeated. A rotary stencil printing method characterized in that printing can be interrupted when a position is detected. 2. A rotary stencil printing machine, with the paper receiving tray to be able to move between the upper and lower limit, the paper receiving tray in accordance with the number of printed sheets, the leading end of the printing paper which is discharged, already discharge paper
Ensure that it does not rub the printed paper
And calculate the number of prints when printing starts.
Print until the specified number is reached and calculate the specified number
A mechanism that lowers the paper tray by a specific position later ,
It is characterized by a mechanism for starting printing when the paper output tray is at the upper limit and calculating the number of prints, and a mechanism capable of detecting that the paper output tray is at the lower limit and interrupting printing. Rotary stencil printing machine.