US1653958A - Sheet-feeding mechanism for rotary printing machines - Google Patents

Description

Dec. 27, 1927. 1,653,958

6. F. GREEN SHEET FEEDING MECHANISM FOR ROTARY PR INTING MACHINES Filed Jan. 23. 1926 INVENT R ATTORNEY Patented Dec. 27, 1927.

UNITED STA CHARLES FREDERICK GREEN, OF ROMFORDQENGLANI), ASSIGNOR TO A. DICK COlVf- TES, PATENT OFFICE.

may, on onIoaGo,rLr.INoIs, AconPonA'rIon or ILLINOIS,

sneer-FEEDING Mechanism non ROTARY PRINTING MACHINES. f

Application filed January 23;1926, Serial No. 83,282, and in 'Great Biitain January 14, 19

The present invention relates to sheet feeding n'iechanism for rotary printing machines, and is an im iirovement in or modification of the construction disclosed in my prior application Serial No. 3218, filed January 19, i925, for sheet feeding mechanism for rotary printing machines. In said prior application I have" disclosed means for ensuring accurate sheet feeding'to rotary printing mai'u chines, the said means comprising sheet feeding mechanism wherein a sheet of paper is introduced either by hand or bywautomatic mcans between a pair of rotating feed rollers which carry the sheet of paper against it a fence or stop, the said fence being Subsequently actuated. by mechanism which moves it out of the path of the sheet, thus releaslng the sheet so that the feed rollers carry it forward between the impression roller and the printing cylinder.

The feed roller gears as well as the roller surfaces were afforded continuous rotation and had just sufficient pressure between them to feed the sheets through while the sheets were free, but the pressure being light enough to permit the rollers to slide over the sheets when the front edges of the sheets were positioned against the fence or stop.

It has been found in practice that the rotating feed rollers pressing against the sheet of paper prior to the actual feeding of the sheet into the machine sometimes marks the paper, or where very thin paper is used it has sometimes happened that a sheet prior to passing into the machine is injured by being forced against the stop or fence by the feed rollers. I

. The principal object of the present inven' tion is to provide means whereby the pressure between the feed rollers is relieved while the fence or stop is obstructing the passage of the sheet, so that marking of, or injury to, the sheets is overcome. Other objects of this invention will be in part obvious and in part pointed out hereinafter.

In accordance with the present invention I provide means for slightly lifting the arms carrying the upper feed roller while the fence or stop is obstructing the passage of the-sheet.

The means for lifting the arms carrying the upper feed roller comprises arms secured at one end directly or indirectly to the rocking shaft or bar to which the fence or stop is secured, the free ends of the arms passing all) under and lifting the ends of'the pivoted arms carrying the upper feed rollers, the raising of said arms to separate the feed rollers taking place when the fence or stop prevents the paper passing into the machine.

In order that a clearer understanding of my invention may be had, attention is hereby directed to the accompanying drawings forming part of this application andillustratingone possible embodiment of my invention. 1n the drawings, Fig. l is a front view of-a rotary printing machine with whichqthe invention is embodied; Fig. 2 is a cross sectional detail View of the feedrollers showing one of thefarms relieving the pressure between the rollers, the view" being taken on the line 2-2 of Fig. 1; Fig. 3 is a similar view to Fig. 2 but shows the arm in its inoperative position; and Fig. 4 is a detail View of one of the arms. Similar reference characters refer to similar parts throughout the several views of the drawmgs.

In the drawings 10 designates the type form support or cylinder of the machine to which is secured in any convenient manner the printing form or stencil. The support 10 is secured to discs 11 mounted on the shaft 12 carried between the side frames 13 of the machine. One of the discs 11 has secured to it or has formed integral therewith a spur gear 21 which, through a suitable train of gearing, drive-s a pinion 34 secured to the lower feed roller shaft 33. The said pinion 34 drives a further pinion 38 secured to the upper feed roller shaft 36, the said shaft being supported in the ends of counterbalanced arms 87 pivotally secured between the side frames 13 of the machine. To the shaft 12 is secured a cam 22, the surface 22 of which depresses a roller 25 secured to a slide 26 housed in a slot formed in astud 27 secured to one of the frames 13 of the machine. The other end of the slide is connected to a short lever 28 secure-d to a rocking shaft 29 pivoted between the side frames. A spur 3O fashioned on said lever 28 is secured to one end of a spring 31, the other end of the spring being secured over a pin on the side frame 13, whereby slide 26 is urged into raised position.

To the shaft 29 are secured a number of upstanding plates 32 which form a vertical stop or fence extending a little above, a little below, and a little behind the feed rollers 33 i ers 33 and 36.

on roller shafts 33, the end of shaft 33 being mounted in the side frames 13.

Secured to the rocking shaft '29, as by screws 50 or [like means, are collars 51 which support arms 52, the free ends of which are bent over so as to pass under the arms 37 to relieve the pressure between the feed roll- It will be observed that when the rock shaft 29 is turned in a clockwise direction by the cam surface 22 depressing the slide 26 through its roller 25, the arms ,52 are taken out of contact with the arms 37 and the feedroller 36 makes firmer contact with the roller 33, or if actualpartition of the rollers has been effected they engage to cause the sheet to be "fed into the machine since the lowering of the arms 52also entails a corresponding withdrawal of the fence or gate from the path of the paper, that is to say, the arms 52 are taken from the position shown in Fig. 2 to about the position shown in Fig. 3. It is to be understood that the degree of Jartition of the feed rollers is always insufhcient to cause disconnection of the gears 34: and 38. a

As many changes could be made in the above construction and as many apparently widely diiierent embodiments ofthis invention could be made without departing from the scope thereof, u it is intendedthat all ingarms connected at one end to a roe 'ng shaft or bar to which the fence or stop is secured, the otherends of said arms being free and passing under and lifting the ends of pivotedarms carrying the upperfeed roller. t i a i This specification signed this 12 day of Jan, 1926. a a a a v CHARLES FREDERICK GREEN.

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