SU123973A1 - The device for switching on the onset of the printing cylinder - Google Patents

Description

Devices are known for activating the onslaught of the printing cylinder, for example, sheet-fed rotary printing machines, made in the form of a four-link hinged link, the slave link of which is equipped with eccentric sleeves rigidly connected to the bearing pins of the print cylinder. The driving link is connected to a gear wheel that interacts with the second gear wheel which receives periodic rotation from the main shaft of the machine via intermediate gears. In known devices, the second gear is rotated by a ratchet mechanism.

In the described device, it is given in a periodic rotation from a crank with a roller mounted on the main shaft and interacting with a four-ply Maltese cross rigidly fastened to the second gear wheel. A crankcase is rigidly connected to a sector that enters the cylindrical recesses of the Maltese cross at times of its height, and the sector is mounted on the main shaft on the sliding tongue and can move along the shaft under the action of a pusher driven by an electromagnet.

These distinctive features of the device make it possible to increase the reliability of its operation.

FIG. 1 and 2 shows a diagram of the device from the front and side.

On high-speed sheet-fed rotary machines, the on-off and on-off switching is performed by moving the printing cylinder / with respect to the printing cylinder 2. This movement is performed by a tracking device. The bearing pins of the printing cylinder / are connected with eccentric sleeves 3, rotated by means of a connecting rod 4 and crank 5 fixed on shaft 6. Shaft 6 with crank 5 receive periodic rotation from crankshaft 7 with roller 6, no. 123973

on the main shaft 9n interacting with the four-Maltese cross 10. The latter is rigidly fixed to the gear wheel 11, which is engaged with the gear wheel 12, mounted on the shaft 6. Continuous rotation of the crankshaft 7 and its interaction with the Maltese cross 10 causes through gear wheels 11 and 12, crankshaft 5 and connecting rod 4, periodically turning the eccentric sleeves 3 and bringing the printing cylinder 1 closer to the plate cylinder 2 or withdrawing it. A temporary fixation of the mechanism in the period after the end of the interaction of the crank 7 with the corresponding groove of the Maltese cross 10 is carried out by sector 13 mounted on the shaft 9 and entering into the notches 14 of the Maltese cross, and the fixation of the mechanism in the position of the Maltese cross produced by sector 15, rigidly connected to crank 7 and entering into the cylindrical recesses of the 14th maltese cross. Sector 15 is mounted on the shaft 9 on a sliding key and can mix along the shaft under the action of a spring-loaded pusher 16 driven by two electromagnet 17. The electromagnet is turned on and off via relays 18, controlled by a cam 19 sitting on shaft 6. When the electromagnet 17 is turned on, sector 15, moving along the shaft 9, enters the recess 14 of the Maltese cross 10 and prevents its arbitrary rotation.

Subject invention

Claims (2)

1. A device for activating the onslaught of the printing cylinder, for example, sheet-fed letterpress rotation masks, made in the form of a hinged four-link, the driven link of which is equipped with eccentric sleeves rigidly connected to the bearing pins of the printing cylinder, and the driving link is connected to the gear wheel interacting with the second toothed cylinder a wheel that is periodically rotated from the main shaft of the machine by means of intermediate gears, characterized in that, in order to increase the reliability of the operation of the device and, second gear is rigidly fixed chetyrehpazovy Maltese cross driven by a periodic rotation of the crank pulley mounted on the main shaft. 2. The form of the device according to claim 1, characterized in that the crank is rigidly connected to the sector that enters the cylindrical notches of the Maltese cross at times of its height, with the sector mounted on the main shaft on the sliding key and can be displaced along the shaft by the pusher driven by an electromagnet.