RU1784568C - Device for automatic paper sheet feeding - Google Patents

Description

1

(21) 4896436/12

(22) 12.27.90

(46) 12/30/92. Bull. Number 48

(71) Scientific and Production Association of Printing Engineering

(72) V.I. Stepanchikov

(56) German Patent No. 2241910. class 8 65 H 3/08, 1975.

(54) DEVICE FOR FEEDING SHEETS

(57) SUBSTANCE: in a device for transporting sheets, the drive axle supporting the lateral racket supports is hollow, connected to the pneumatic system, has air ducts that are located along its generatrix and are oriented at an angle to the working surface of the lateral racket supports. 2 silt

The invention relates to the printing industry, in particular to feeders for sheet printing machines.

A device for feeding sheets of a feeder is known, comprising a table for placing the foot, vacuum suction cups for gripping the upper sheet of the foot and moving it to the receiving shaft with a pressure roller and arranged along the front wall of the table with the possibility of angular rotation of the axle with lateral stop rails installed along it.

A disadvantage of the known device is that it is not always ensured that the sheets of paper are well inserted between the pickup roller and the pinch roller. This is due to the fact that in modern feeders of sheet-fed printing machines, when a sheet of paper moves from the stocks into the interaction zone of the pressure roller with the receiving shaft, its leading edge sags and moves along the working surface of the inclined racks, in contact with it. This means that the sheet practically decelerates, as a result of which its leading edge enters the action zone of the pinch roller with the receiving shaft with a skew or bent, which

ultimately leads to a decrease in the reliability and quality of the sheets fed.

The purpose of the invention is to improve the reliability and quality of the sheets fed into the interaction zone of the pressure rollers with the receiving shaft of the feeder of the feeder.

This goal is achieved due to the fact that the proposed device for feeding sheets of the feeder has a system for supplying compressed air, and the axis with the lateral support racks installed along it is hollow and has holes located between the lateral support racket, the axes of which are directed towards the table and are located at an acute angle to the working surfaces of the lateral racks, while the axis cavity is connected to a system for supplying compressed air

Figure 1 shows the proposed device for feeding sheets of the feeder, the emphasis-racket of which is depicted at the moment standing in a vertical position at the front edge of the upper part of the stocks, side view; figure 2 is the same front view.

The feeder sheets feeder contains stacker table 1, vacuum suction cups 2, receiving shaft 3, pinch rollers 4, hollow axis 5, holes 6, pin

WITH

00

4 SL O 00

racket 7 air ducts 8 compressed air systems

The proposed feeder sheet feeder operates as follows.

The slipway of 9 sheets of paper, mounted on the gantry table 1, rises, by measure 10, to the level at which the front upper edge is 5-1 mm wide by 5-7 mm of the top edge of the ytiopoB tS31tftTeT03 7 in the vertical position. 9, the sheet-feeding system of the feeder is turned on. In this case, the vacuum suction cups 2 perform horizontal reciprocating motion, the stop rails 7 — the swinging, receiving shaft 3 and the pressure rollers 4 — rotational movement, and air is constantly supplied from the holes b, falling from the air ducts 8 of the compressed air supply system Before starting the movement of the sheet from the stocks 9, which is provided by vacuum suction cups 2, the swinging racks 7. mounted on the hollow axis 5, stand at the edges of the edge of the upper part of the stocks 9 so that their working surfaces are in a vertical position. In this case, under the action of air coming from the holes 6, the leading edges of the sheets of the upper part of the berths 9 are in a fluffy state and, thereby, favorable conditions are created for moving true in the direction of feeding them into the machine. These conditions are also preserved during the passage of the leading edge of the sheets over the racket supports 7, which, until the start of the movement of the sheet, separated from the stocks 9, are tilted in the direction of movement of the sheet, skipping its front edge into the action zone of the pressure rollers 4 s

the receiving shaft 3, and acting through the air supplied from the holes b, on the lower surface of the front edge of the sheet separated from the stock 9.

When the sheet is started to be driven by the receiving shaft 3 and the pressure rollers 4, the vacuum in the suction cups 2 is turned off and they release the sheet, and the racket-7 stops turn towards the slipway 9 and again stand upright. In this case, the leading edges of the upper sheets are again in a fluffy state.

The technical and economic effect of the proposed device in comparison with the prototype is to increase the reliability and quality of paper sheets introduced into the interaction zone of the pressure rollers with the receiving roller of the feeder, which, in turn, increases the productivity of the printing machine and reduces paper waste.

Claims (1)

The claims A feeder for feeding sheets of a feeder comprising a table for placing a foot. vacuum suction cups for gripping the upper sheet of the foot and moving to the receiving shaft with a pressure roller and arranged along the front wall of the table with the possibility of angular rotation of the axis with lateral stop rails installed along it, characterized in that, in order to increase the reliability in operation and the quality of the fed sheets , it has a system for supplying compressed air. And the axis is hollow and has openings located between the lateral racket rails, the axes of which are directed towards the table and are located at an acute angle to the working the surfaces of the lateral racket rails, wherein the axis cavity is connected to the compressed air supply system. 4 5 8 2 Che3 te 2