JPH0444367Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a two-sheet detector for a sheet-fed printing press that is applied to eliminate unauthorized paper feeding in a sheet-fed printing machine feeding section.

[Conventional technology]

Generally, in offset sheet-fed printing presses, the second
As shown in the figures to FIG.
It is placed on an endless tape 07 and fed so as to stop at a front abutment claw 09 provided at the front end of a front abutment plate 08 of the register section.

The front end of the sheet 06 is gripped by a swing gripper 010, pulled out, and delivered to the first intermediate cylinder 011 of the first color printing unit 02. After that, the printing paper 06 passes through the path of the arrow to the impression cylinder 012 and the blanket cylinder 01.
3, the first color is printed, and the second intermediate color is 014.
The paper then reaches a second color printing unit 03, where the second color is printed and then the paper is discharged through a paper discharge section 04.

Since the positions of the front pawl 09 and the swing gripper 010 are shifted so as not to hinder their respective movements, the paper 06 can be delivered from the front pawl 09 to the swing gripper 010 without any hindrance.

Next, in order to detect irregularities in the position and other irregularities of the paper 06 that is fed from the paper feed section 01 toward the front abutment claw 09, that is, incorrect paper feeding, various types of markings are placed on the front end of the front abutment plate as shown in Fig. 4. Detectors are provided, and the main ones are a two-sheet detector 015, a register detector 016, and an overshoot detector 017.

The two-sheet detector 015 electrically confirms that there is only one sheet of paper, and when two or more sheets of paper are sent, it immediately issues a command to stop printing, stops paper feeding, and prevents damage. This is a device that prevents paper generation and machine damage.

[Problem that the invention attempts to solve]

In conventional sheet-fed printing presses, the electric control circuit for the two-sheet detector is independent of the drive unit power supply, and its use or non-use is controlled by a separate switch on the operation panel. Therefore, when the switch is on, the two-sheet detector works, but when it is off, even if two or more sheets overlap, it does not work and is sent to the printing cylinder.

As a result, the following problems occurred, and it was difficult to solve them: (1) Damage to the blanket of the rubber cylinder.

(2) Bending of each cylinder (rubber cylinder, impression cylinder, intermediate cylinder).

(3) Occurrence of paper waste.

[Means for solving problems]

(1) Install a two-pole selective power switch branching off from the electric circuit leading from the drive unit power switch to the drive unit.

(2) Connect two detectors to one pole of this two-pole selective power switch, and connect an alarm to the other pole.

[Effect]

With the two-sheet detector with an alarm configured as described above, even if you forget to turn on the power switch of the two-sheet detector and start operating the machine, you will immediately notice due to the alarm's sound, and the two-sheet detector Since the power to the detector can be turned on, accidents can be prevented.

〔Example〕

FIG. 1 shows an embodiment of the present invention, and is a layout diagram of two-sheet detectors in a sheet-fed printing press with an alarm.

The two-sheet detector of the sheet-fed printing press according to the present invention is the first
As shown in the figure, a drive unit power switch 21, a two-pole selection type power switch 23 provided branching from the electric circuit from this power switch to the drive unit 21, and one pole 24 of this power switch It is comprised of two detectors 25 that are connected and an alarm 27 that is connected to the other pole 26 of this power switch 23. 28 is a control panel, and 29 is a two-piece detector 25.
This is a feedback circuit.

If the two-sheet detector configured as in the present invention is used, while the printing press is running with the drive section power supply switch 21 turned on, the two-sheet detector 25 may be left in the unused state, i.e., the power is turned off, due to some work-related circumstances. When the switch 23 is turned off with respect to the pole 24 and turned on with respect to the pole 26, current flows through the alarm device 27 and the operator is notified of the state by an alarm.

Conventionally, if a worker turns on a machine switch while the two-sheet detector is off, the two-sheet detector will not operate, often causing the above-mentioned problems.

However, in a printing press in which the present invention is implemented, an alarm goes off at the same time as the machine is restarted, alerting the operator to any abnormality, thereby making it possible to prevent trouble from occurring.

[Effect of idea]

If the machine is started with the two-sheet detector turned off, an alarm will sound and the operator will be reliably notified, thereby eliminating problems that previously occurred, such as damage to the blanket cylinder bellows due to failure to detect two sheets, and damage to the blanket cylinder of each cylinder. Problems such as bending and paper waste can be reliably prevented.

[Brief explanation of the drawing]

FIG. 1 is a layout diagram showing an embodiment of the two-sheet detector of the sheet-fed printing press of the present invention. Figures 2 to 4 are conventional examples; Figure 2 is a front view of a sheet-fed printing press; Figure 3 is a front view of a sheet-fed printing press;
The figure is a front view of the front abutment claw and the swing gripper part, and FIG. 4 is a plan view of the end of the front abutment plate. 21... Drive unit power switch, 22... Drive unit,
23... 2-pole selection type power switch, 24... 1-pole,
25...2 detectors, 26...other pole, 27...
...Alarm, 28...Control panel, 29...Feedback circuit.

Claims (1)

[Scope of utility model registration request] A two-pole selective power switch is installed in the circuit branching from the electric circuit leading from the drive unit power source to the drive unit, and one pole of the power switch is equipped with a two-sheet detector for the paper feed section, and the other pole is equipped with an alarm. A two-sheet detector for a sheet-fed printing press, which is characterized by being connected to a device.