SU133897A1 - Device for shutting down the onslaught of the printing cylinder of a sheet-fed printing press in the event of non-feeding or incorrect feeding of sheets - Google Patents

Description

A device is known for shutting down the onslaught of a printing cylinder of a sheet press of a machine during non-feeding or incorrect feeding of sheets, including electrocontact and photoelectric control devices, amplifying and rectifying electronic circuitry and actuating relays for switching off the onset, switching off the feeder and transferring the maschine from an auxiliary electric motor.

In the described invention, in order to improve performance, together with the executive relays, a system of limit switches and contacts is activated, triggered when the printing cylinder is lowered and the feeder is fed to the next sheet and automatically turns on the machine to the operating mode.

A schematic diagram of the device is shown in the drawing.

The operation of the device is as follows.

When the handle / samonaclada is turned on, the contacts of the end switch 2 mounted on the maschine slipway close. The executive relay 3 is turned on via the contacts of the limit switch 4, which are closed when the on-off voltage is off.

An onslaught solenoid 5 is activated through the contacts of the end switch 2 when the magnetic actuator 6 of the main motor is turned off. Onslaught 5 solenoid prepares the onset of the onset.

The onset of activation occurs at a certain position of the printing cylinder, the rotation of which is carried out by an auxiliary engine (not shown in the drawing).

When the onset is turned on, the limit switch 4 switches and breaks the actuation circuit of the executive relay 3,

If the sheet feeder does not feed the sheet or feeds the weighted sheet when the sheetframe is in operation, contact 7 is closed.

No. 133897-2 -

ical probe in the relay circuit 8, which is triggered by closing the contact I closing the sheet at the time of stopping before the stops of the patch table.

When two sheets are fed, the operation of the relay 8 is controlled by a photoelectric monitoring device 10 and an electronic amplifier 11.

By contact 12, relay 8 switches on relay 13, which is then blocked by its contact 14 and contact 15.

Pin 15 opens at the start of the sheet in front of the stops of the patch table.

When the relay 13 is triggered, the solenoid of the onset 5 and the magnetic starter 6 of the main engine are turned off. The printing cylinder is lowered, switches the limit switch 4, and switches on relay 3, which, with its contact 16, prepares the operation circuit of relay 17 in case of the repeated operation of relay 8 (when sheet feeding is repeated incorrectly)

When the next sheet is laid out to the stop m, the contact 15 is opened, the relay 13 is turned off and the onslaught 5 solenoid is turned on, after which the limit switch 2 by contact 18 turns on the magnetic starter 6. The machine again works from the main engine, but at the first speed, as a circuit of starters 19, 20, 21 (the combination of which changes the speed of the machine) is opened by the contact 22 of the relay 23.

After removing the white sheet by pressing the button 24, the power supply circuit of the relay 23 is broken and the machine switches to the desired speed.

When the sheet sheet is re-fed incorrectly, the relay 17 is activated, with its contactor m 25 it opens the power supply circuit of the relay 26 and the magnetic starter 6 of the main motor is switched off. The solenoid 27 is turned on, which knocks out the handle / feeder; the contacts of the end switch 2 are opened and the onset solenoid 5 is switched off.

Subject invention

A device for shutting down the onslaught of the printing cylinder of a sheet of printing paper during non-supplying or incorrect feeding of sheets, including electrical contact and photoelectric control devices, amplifying and rectifying electronic circuitry and actuation relays for switching off the pressure, turning off the feeder and switching the machine to work from the auxiliary electric motor, that, in order to increase productivity, a system of limit switches and contact comrade, triggered when lowering the impression cylinder and the feeding of the next sheet feeder and the machine automatically including the working mode.