JP2901082B2 - Printer - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing press, and more particularly to a printing press characterized by detection control of a master wound around a drum unit.

[Conventional technology]

The printing press uses the operation unit to discharge the used master on the drum unit, and to process the plate making process of winding the new master and the drum unit around the drum unit, and the printing process of printing the image formed on the master on the paper from the paper feeding unit. It is configured to perform selection.

[Problems to be solved by the invention]

Conventional printing presses have not been provided with a mechanism for detecting and determining the presence or absence of a master wound around a drum unit.

Therefore, in the plate making process, even when the used master is not wound around the drum portion, it cannot be detected, and an unnecessary plate discharging operation is performed.

Conversely, even if the used master is left on the drum part even if the master discharge operation is performed due to a master discharge error, this cannot be detected. There was a problem that printing was not possible.

On the other hand, in the printing process, if the new master is not wrapped around the drum part, it cannot be detected and the printing operation starts.Therefore, the paper sticks to the drum part with ink, and the paper is discharged. There is a phenomenon that the paper rolls up without being discharged to the sheet. In this case, printing cannot be normally performed as it is, so the drum portion must be pulled out of the machine body and the wound paper must be peeled off. In addition, since the peeled paper has ink on one side, it cannot be used for printing paper. Further, since the peeling is performed by the user's hand, the ink adheres to clothing and hands. Was. Also, if the plate-making process is executed with the reeds wound up, this sheet is stuck on the drum part and will not be discharged, so it will become a jam in the plate discharge section, or a new master will be wound on the sheet. There was also a problem that it was.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned various problems at the time of executing each process by not detecting a master, and to provide a printing machine that can always execute an appropriate process.

[Means for solving the problem]

The purpose of the above operation is to perform a plate making process of discharging a used master on the drum unit and winding a new master around the drum unit, and a printing process of printing an image formed on the master on paper from a paper feeding unit. In the printing press selected and executed, a detecting means for detecting a master wound on the drum unit, and when a plate making process is selected from the operation unit, the used master is wound on the drum unit by the detecting means. Is detected by providing control means for instructing a plate discharging operation.

At that time, the control means, after the plate making process is selected from the operation unit, after the plate discharging operation is completed, when it is detected that no master remains on the drum unit, it instructs a plate making operation, and after the plate discharging operation, When it is detected that the used master is still wound, a warning is displayed and the plate making operation is stopped.

Further, the control unit, when a printing process is selected from the operation unit, when the detection unit detects that the master is wound around the drum unit,
When a printing operation is instructed and the detection means cannot detect that the master is wound around the drum portion, a warning is displayed and the printing operation is stopped.

[Action]

The control means instructs a plate discharging operation when a signal from the detecting means determines that the used master is wrapped around the drum portion during the plate making process, and after the plate discharging operation, the master remains on the drum portion. It detects that it is not connected and instructs the plate making operation.

On the other hand, when executing the printing process, the control means
It detects that a new master is wrapped around the drum unit and gives an instruction for a printing operation. If not, the printing operation is stopped.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view of an embodiment of a printing press according to the present invention, wherein 1 is a machine main body, 2 is a control section (control means), 3 is a document reading section, 4 is a display section, 5 is an operation section, 6 is paper, 7
Is a master, 8 is a thermal head, 9 is a drum unit, 10 is a sensor unit (detection means), 11 is a paper feeding unit, 12 is a paper discharging unit, 13 is a plate discharging unit, and 14 is a plate making unit.

FIG. 2 is a longitudinal sectional view of the vicinity of the drum unit 9 during printing, FIG. 3 is a perspective view of the drum unit 9, FIG. 4 is a plan view of the operation / display panel, and in FIG. Reference numeral 21 denotes a screen unit. In FIG. 3, reference numeral 22 denotes a light absorbing portion. Further, in FIG. 4, reference numeral 23 denotes a printing start key, 24 denotes a plate making start key, and 25 denotes an LED.

Here, the general printing operation will be briefly described.
First, when the plate making start key 24 is pressed to execute the plate making process, the used (printed) master wound around the drum unit 9 is discharged to the plate discharging unit 13 by a known plate discharging operation. An operation of winding a new master 7 (perforated) on which an image has been written by the thermal bed 8 according to the reading result of the document reading unit 3 around the drum unit 9 is performed.

On the other hand, when the printing process is executed by pressing the print start key 23, the ink 20 is applied to the paper 6 fed from the paper feeding unit 11 at the contact position with the drum unit 9 by the mesh portion of the screen unit 21 and the image pattern. The image is supplied through a hole 7a of the master 7 to be formed, whereby an image is formed on the sheet 6.

Returning to FIG. 1, a sensor unit 10 including a reflection type photo sensor for detecting winding of the master 7 is provided on the outer peripheral portion of the drum unit 9. The control unit 2 performs a control operation as described later.

FIG. 5 is a control block diagram, in which the control unit 2 and each unit described in FIG. 1 are electrically connected as shown. Reference numeral 19 denotes a printing execution unit that performs the above-described paper feeding operation, the operation of supplying the ink 20 to the paper 6 at the contact point of the paper 6 with the master 7 wound around the drum unit 9, and other related operations. The mechanism is shown.

FIG. 6 is a detection block diagram of the master 7, in which 15 is an oscillating unit, 16 is a noise filter unit, 17 is a voltage amplifying unit, and 18 is a voltage comparing unit. An oscillating unit 15 is provided at the front stage to always emit light, a voltage signal corresponding to the received light on the light receiving side is amplified by a voltage amplifying unit 17 through a nozzle filter unit 16, and compared with a reference voltage by a voltage comparing unit 18 and output. ing. Here, components other than the sensor unit 10 are assembled in the control unit 2.

FIG. 7 is a flow chart showing the contents of the plate making process;
FIG. 8 is a flow chart showing the contents of the printing process. The control operation of the printing press of this embodiment shown in FIGS. 1 and 5 will be described based on these flow charts.

 First, the plate making process will be described with reference to FIG.

When a plate making process is selected by depressing the plate making start key 24 (FIG. 4) of the operation section 5, this selection signal is taken into the control section 2. If the original is set in the original reading section 3 (YES in 7-1), it is detected whether or not the master 7 is wound around the drum section 9 (7-2). When the master 7 is not wound, light from the light emitting side of the sensor unit 10 facing the light absorbing unit 22 (FIG. 3) is absorbed by the light absorbing unit 22, and the reflected light does not reach the light receiving side. When the master 7 is wound around the drum unit 9, the reflected light reaches the light receiving side because the master 7 has a high reflectance. Thus, the presence or absence of the master 7 can be detected and determined by the sensor unit 10 and the control unit 2.

The control unit 2 fetches the selection signal from the plate making start key 24 and the master presence signal from the sensor unit 10 and calculates according to a predetermined program, and then performs the above-described plate discharge operation command (7-3). In the plate discharging section 13, the used master 7 wound around the drum section 9 is peeled off and stored. After confirming that the master 7 is not wound around the drum section 9 (NO at 7-4), the reading and prepress operation commands are issued from the control section 2 and the thermal head 8 is moved to the position of the master 7 corresponding to the original. A plate is made by making a hole (7-5) and wound around the drum 9 (7-6).

On the other hand, if a plate discharge occurs and the used master 7 is wound around the drum unit 9 after the plate discharge operation (YES at 7-4), the plate discharge operation is performed again (7-7).
The winding of the master 7 of the drum unit 9 is detected again by the sensor unit 10 (7-8). If the plate discharge has been completed successfully (NO in step 7-8), the process proceeds to the plate making operation in step 7-5. If the plate discharge error continues (YE in step 7-8).
S), the LED 25 of the display unit 4 blinks and a warning is displayed (7-).
The plate making process is stopped together with 9) (7-10).

If the used master 7 has not been wound around the drum section 9 after the original is set (NO in 7-2), since there is no need to discharge the plate, the process jumps to step 7-5 and immediately proceeds to the plate making operation. enter.

Next, the printing process will be described with reference to FIG. 8. When the printing process is selected by pressing the print start key 23 (FIG. 4), the selection signal is taken into the control unit 2. Then, it is determined whether a new master 7 is wound around the drum unit 9 in the same manner as described above. If the master 7 is wound around the drum section 9 (8-
(YES in 1), a command is issued from the control unit 2 to the print execution unit 19, and the print operation is executed (8-2). When the master 7 is not wound around the drum section 9 (see
NO), the LED 25 of the display unit 4 flashes and a warning is issued (8-3)
At the same time, the printing process is stopped (8-4).

If you press the prepress start key 24 here, LED2
5 disappears, skips the above-described plate discharging operation, and immediately enters the plate making operation.

〔The invention's effect〕

As described above, according to the present invention, the control means
During the plate making process, when a signal from the detecting unit determines that the used master is wound around the drum unit, a plate discharging operation is instructed, and no master remains on the drum unit after the plate discharging operation. Is detected, and a prepress operation is instructed.

On the other hand, when executing the printing process, the control means
It detects that a new master is wrapped around the drum unit and gives an instruction for a printing operation. If not, the printing operation is stopped.

Therefore, troubles such as winding of the paper around the drum portion, winding of a new master on the wound paper, or double winding of the master can be prevented.

[Brief description of the drawings]

FIG. 1 is a block diagram of an embodiment of a printing press according to the present invention, FIG.
FIG. 3 is a longitudinal sectional view of the vicinity of the drum portion during printing, FIG. 3 is a perspective view of the drum portion, FIG. 4 is a plan view of the operation / display panel, and FIG.
FIG. 6 is a control block diagram of a printing press according to the present invention, FIG. 6 is a block diagram of a master detection block, and FIGS. 7 and 8 are flowcharts showing control contents according to the present invention. 2. Control part, 5 ... Operation part, 9 ... Drum part, 10 ... Sensor part.

Claims (5)

(57) [Claims] 1. A plate making process for discharging a used master on a drum unit and winding a new master around the drum unit, and a printing process for printing an image formed on the master on paper from a paper feeding unit. A printing unit selected and executed by the unit, a detecting unit for detecting a master wound around the drum unit, and when a plate making process is selected from the operation unit, the used unit winds the used master around the drum unit by the detecting unit. And a control means for instructing a plate discharging operation when detecting that the printing operation has been performed. 2. The method according to claim 1, wherein the control means instructs a plate making operation when it is detected that no master remains on the drum after the plate making process is selected from the operation section and the plate discharging operation is completed. The printing press according to claim 1, wherein 3. The plate-making operation according to claim 2, wherein the control means displays a warning and stops the plate-making operation when detecting that the used master is still wound after the plate discharging operation. Printer. 4. The control means instructs a printing operation when a printing process is selected from the operation unit and when the detection means detects that a master is wound around the drum unit. The printing press according to claim 1. 5. The control unit displays a warning when a printing process is selected from the operation unit and when the detection unit cannot detect that a master is wound around the drum unit, and displays a warning. The printing press according to claim 1, wherein the printing operation is stopped.