RU1781151C - Device for piecewise separation of sheets from stack and subsequent feed to working zone - Google Patents

Abstract

Essence: in the device for piece separation of sheets there is a table for placing the foot and located on its opposite sides from the side opposite to the sheet issuing direction, two means for gripping the sheet, each of which includes an arm placed at an angle to the longitudinal axis, a lever with a lateral stop and a gripping an element made in the form of a perforated cylinder, and the perforation holes are arranged in the form of an isosceles triangle, the apex of which is directed from the longitudinal axis of the table, and the angle between the gripping elements E is 45. 3 ill.

Description

The invention relates to printing equipment, in particular to feeders of sheet materials, e.g. sheets of paper for printing folding and other machines.

It is an object of the present invention to increase operational reliability and expand technological capabilities by allowing low density sheets to be fed.

In FIG. 1 shows a General view of the device; in FIG. 2 is a view A in FIG. 1; in FIG. 3 is a section BB in FIG. 2

 The device for separating the sheets from the stack by one piece and feeding into the working area comprises a table 1 arranged on the side of the table opposite to the sheet feeding direction and, on its opposite sides, a pair of sheet gripping means, each of which has a gripping element 2 made in the form of a cylindrical suction element with perforation 3

on its working surface, made in the shape of an isosceles triangle, the vertex of which is directed from the longitudinal axis of table 1. The angle between the gripping element 2 and the longitudinal axis of table 1 is 45. To remove the top sheet of paper from table 1, there is a sheet-feeding element 4 with drive 5. Side the stops 6 and the rear stops 7 are mounted on the gripping elements 2. The press-blower 8 is connected via the lever 9 to the drive 10. The lever 11 is mounted on the lever 9, and the limit switch 13 is fixed on the bracket 12.

The device operates as follows.

A stack of 14 sheets of paper is laid on the goal 1, the side stops 6 and the rear stops 7, the gripping elements 2 are oriented relative to the foot 14, above its corners.

When creating a vacuum in the perforation channels 3 of the gripping elements 2 from the stack 14, the intake air stream is separated

the angle of the top sheet of paper and rises to touch the gripping element 2, envelops its working surface, covering the perforation 3. The angle of the top sheet of paper is raised above the stack 14.

After that, the press-blower 8 mounted on the lever 9 is lowered to the angle of the foot 14 under the folded top sheet of paper. As the lever 9 is lowered, the slide 11 runs into the limit switch 13, which commands the supply of compressed air under the top sheet. In this case, the press-blower 8 compresses the foot 14.

Then, the supply of vacuum to the gripping elements 2 is turned off and the supply of vacuum to the sheet-feeding element 4 begins. As a result, the upper sheet of paper is removed from the stack 14. After lifting the presser-blower 8 upwards using the drive 10, the cycle is repeated.

Owing to such a design of the device for piece-wise separation of sheets from the stack and feeding into the working area, it became possible to increase reliability and expand technological capabilities.

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Claims (1)

SUMMARY OF THE INVENTION A device for separating sheets from a stack by one piece and feeding into a work area, comprising a table for placing the stack, placed on the side of the table opposite to the sheet feeding direction and on its opposite sides a pair of sheet gripping means, each of which includes placed at an angle to the longitudinal axis a table with the possibility of swinging in a plane perpendicular to the table, a lever and a gripping element, characterized in that, in order to increase the reliability of work and expand technological capabilities by providing the possibility of feeding sheets of low density, each means for gripping the sheet has a side stop mounted on the lever behind the gripping element along the swing of the lever, and the gripping element is made in the form of a cylindrical suction element with perforation on its working surface, made in the shape of an isosceles triangle, the apex of which is directed from the longitudinal axis of the table, while the angle between the gripping element and the longitudinal axis of the table is 45 °. -7  L FIG. / 14 fig 3