US2038877A - Sheet separating and feeding device - Google Patents

Description

April 28, 1936.

G. SPIESS SHEET SEPARATING AND FEEDING DEVICE Filed June 29, 1934 7n ken in H ll JI Patented Apr. 28, 1936 PATENT orriciz SHEET SEPARATING AND FEEDING DEVICE Georg Spiess, Leipzig, Germany Application June 29, 1934, Serial No. 133,111 In Germany July 5,1933

4 Claims. (oi. 2111- -27) This invention relates to a device for separating and conveying sheets from piles, the sheets being lifted off from the pile and conveyed by a suction member stationarily arranged above the latter at a distance therefrom. The sheets have to move over this distance between the pile and the suction member and will do so more or less easily according to the thickness and quality of the sheets. In case of thin sheets several of 1o them may be simultaneously drawn up by the suction member, whereas the suction will be insufiicient for thicker sheets which thus are drawn up only slowly and causeservice troubles. This circumstance gives rise to defects in the operation of the machine in the case of the known devices. I

It is the principal object of the present invention to provide means for eliminating these defects by providing on the device a suction roller stationarily disposed above the pile and extending. over the whole width thereof, and an air blast member stationarily arranged in advance of the pile and extending overthe whole width thereof, whereby an air blast forming a continuous sheet extending over the entire sheet width is obtained, and means for adjusting said air blast in respect ofthe ,pile. Further objects of theinvention will become apparent fromthe hereinafter contained description with reference to the accompanying drawing. v

By way of example, the invention is illustrated in the accompanying drawing, all details of a sheet separating and feeding device being omitted which are not necessary for understanding the invention.

Figure 1 is an elevation of the device according to the inventionand Fig. 2, a plan thereof.

Referring to the drawing, an adjusted sheet pile I on a table 2 is advanced by the transport bands 3 of a pile conveying device, not shown, in the direction of a sheet feeding device in the form of a roller 4 to such an extent that the tip of the paper pile is always in a position most favorable for sheet separation. In the feeding frame 5 a roller 6 is disposed to which the arms l are secured for carrying the shaft a of a suction conveyor roller 9 which is rotated in known manner. One of the arms i is provided with a stop arm l0 which is drawn by a spring ii against an adjustable stop formed by the set screw R2. The set screw 52 serves for regulat ing the height of the suction roller Q relative to the pile support or feeding roller. The suction roller 9 extends over the entire width of the pile are table and can thus act on the full length of the front edge of sheets of greatest width. Several circumferential rows of suctionholes beginning at the ends of the roller may be rendered inoperative in known manner. 5'

Between the front edge of the'table 2 or an extension plate i3 and the feeding roller 4 a hollow ledge It having a triangular cross section and pins at its ends is arranged with the pins in the arms I5 secured to a shaft iii. A stop arm I! of this shaft is drawn by a spring it against a set screw is disposed at the feeding frame, so that the hollow ledge M can be adjusted as to its height relative 'to the roller 4 and the suction roller e by means of the set screw IS. The ledge M can be moved about its end pins in the arms and fixed in position so as to adjust also at will the inclination of the ledge surface, in which a series of blast nozzles is arranged, relative to the surface of the pile.

When the rear edge of a sheet in the process of being conveyed has passed the row of the suction nozzles of the suction roller 9, the front edge of the top sheet of the pile will be caught by the suction roller and drawn up over its entire length. The gap formed between the drawn up front portion of the top sheet of the pile and the sheet underneath will thus cover the entire width of the pile, so that the air coming out .of the blast nozzles preferably distributed over the full width of the pile will sweep over the entire area of the cohering sheets and separate them.

If desired, provisions may be made for a control of the suction and blast air, though it is not necessary, so as to insure a certain spacing in the succession of the sheets and to stop the air blast when the sheets are drawn up.

1. In a device for separating and feeding sheets from a pile of paper the combination of: a suction roller stationarily disposed above said pile and'extending over the whole width thereof; said suction roller being adapted to separate and feed the sheets from the pile; means for adjusting said suction roller in respect of the pile;

and air blast member stationarily arranged in advance'of the pile and extending over the whole width thereof whereby an air blast'forming a continuous sheet extending over the entire sheet width is obtained; and means for adjusting said air blast member in respect of the pile.

2. In a device for separating and feeding sheets from a pile of paper the combination of: a suction roller stationarily disposed above said pile table and extending over the wholewidth 55,

' thereof; levers arranged above the pile table and member; and means adapted to regulate the position of saidlevers and therewith the position of said air blast member relative to the pile; in-

dependently of the pile feed.

3. In a device for separating and feeding sheets from a pile of paper arranged in echelon the combination of a suction roller stationarily disposed above said pile and extending over the whole width thereof; said suction when being adapted to separate and feed the sheets from the pile; means for adjusting said suction roller in respect of the pile; an air blast member stationarily arranged in advance of the pile and extending over the whole width thereof whereby an air blast forming a continuous sheet extending over the entire sheet width is obtained; and

means for adjusting said air blast member in respect of the pile independently of the pile feed. 4. In a device for separating and feeding sheets from a pile of paper arranged in echelon sition of said levers and thus the position of said suction roller relative to the pile; an air blast member arranged stationarily in advance of the pile and extending over the whole width thereof whereby an air blast forming a continuous sheet extending over the entire sheet width is obtained; levers carrying said air blast member; and means adapted to regulate the position of said levers and therewith the position of said air blast member relative to the pile independently of the pile feed. 7

GEORG SPIESS.

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