SU876491A1 - Sheet fed printing machine - Google Patents

Description

(54) SHEET PRINTING MACHINE

  one;

FIELD OF THE INVENTION The invention relates to printing machinery and can be used in operational printing.

The known sheet printing machine, mainly for operational printing, contains a printing device, a printing unit including a printing cylinder with a flexible printing form, a printing cylinder and a dyeing apparatus, and a receiving device I).

A disadvantage of the known sheet press is that a part of the time of the technological cycle is spent on unproductive readjustment and adjustment of the paper passing system.

The purpose of the invention is to increase productivity by reducing the time for changeover.

The goal is achieved by the fact that in a sheet press machine, mainly for an operative polygraph, containing a sheet-feeding device, a printing unit, switching off the plate cylinder with a flexible printing form, a printing cylinder and an inking machine, and a sheet-receiving device, the printing unit is equipped The mold has a closed loop and freely covers the plate cylinder and the support roller, while the sheet feeder has a sensor for the position of the junction point of the printing form.

 The lines of contact of the printing cylinder and the knurling roller of the dyeing apparatus with the forme cylinder are arranged in different positions.

and RHOES from the vertical plane and below the horizontal plane, passing through the QF cut through the axis of the form cylinder.

The drawing shows a printing machine, a general view.

Sheet printing machine, mainly for operational printing, contains 1 printed on the page

15 knot, including printing cylinder 2, plate cylinder 3 with flexible printing form 4 and inking unit 5 having an overlap roller 6. A support roller 8 is mounted on the rack 7 of the print f unit. Flexible printing form 4 is closed

 contour and freely covers the plate cylinder 3 and the support roller 8. The circumference of the plate cylinder is 3 mei

above the circumference of the printing plate 4. The printing cylinder 2 is driven not by the actuator 9.

The contacts of the printing cylinder 2 and the rolling roller 6 of the inking apparatus with the forme cylinder 3 are located on opposite sides of the vertical plane below the horizontal plane passing through the axis of the plate cylinder 3. The sheet supplying device 10 has a sheet feed mechanism and sliding stops 12. Printed sheets output TC to the sheet-receiving device 13. The sheet-feeding device 10 has a sensor 14 of the position of the interface of the printing plate, which is triggered when a luminous flux is emitted through the gap 15 between the edges mi printing form light source 16.

Printed flexible form 4 in expanded form is entered manually between the printed 2 and the 3 form cylinders so that its left and right edges lie

to support 8, which is pre-extended to a size corresponding to the size of the printing plate 4, and serves as a support when connecting two coits of the printing plate 4.

The machine works as follows.

After connecting the ends of the printing plate 4, the machine is ready for operation. The ends of the printing form 4 are assembled with one of the known methods (for example, by means of adhesive tape), so that the connection point of the ends does not interact with the knurling roller 6 of the inking device, there are provided shoulders at the ends of the printing form 4.

- Printing is carried out in a manner known for sheet presses. The actuator 9 is turned on, which causes the printing cylinder and the plate cylinder 3 and rollers of the colouration apparatus 5 to rotate. According to the signal of the sensor 14, when the light flux from the source of light 16 passes through it through the gap 15 formed by the edges of the printing form 4.

A mechanical connection is also possible between the gap 15 and the front stops 12 by means of a finger-contact sliding on the printing plate 4. The ink on the printing plate 4 is applied with a knurled roller 6 edge: juicy apparatus. The printed sheet is output to the sheet receiving device 13.

A distinctive feature of the car in-. It is possible to print on any kind of paper with ordinary {harmless} inks. The advantage of the proposed device is a quick (2 min) change of shape. The possibility of using different forms of length, which expands the technological capabilities of the machine without rebuilding its nodes.

Claims (2)

1. Sheet-fed printing machine, mainly for operational printing, containing a sheet-feeding device, a printing unit including a plate cylinder with a flexible printing form, a printing cylinder and an inking machine, and a sheet-receiving device, characterized in that, in order to increase productivity reduced time for readjustment, the printing unit is equipped with a supporting roller, and the flexible printing plate has a closed loop and freely covers the plate cylinder and the supporting roller. 2. The machine according to claim I, characterized in that the contacts of the printing cylinder and the knurling roller of the inking apparatus with the form cylinder are located on opposite sides of the vertical plane and below the horizontal plane, the passage - sh. through the axis of the plate cylinder. . Sources of information taken into account in the examination I. USSR author's certificate U 1108061, cl. B 41 F5 / 02, 1956 (prototype).