US915632A - Sheet-conveying mechanism for printing-presses. - Google Patents

Description

F. 0. STOGKHOLM. SHEET CONVEYING MECHANISM FOR PRINTING PRESSES.

APPLICATION FILED NOV.27,1907.

Patented Mar. 16, 1909.

UNITED STATES PATENT OFFICE.

SHEET-CONVEYING- MECHANISM For. rnm'rme-rnnssns.

Specification of Letters Patent.

Patented March 16, 1909.

Application filed November 27, 1907. SeriaLNo. 464,084.

To all whom it may concern:

.Be it known that I, FRANK C. STOOKHOLM, a citizen of the United States, residing in Philadelphia, Pennsylvania, have invented certain Improvements in Sheet-Conveying Mechanism for Printing-Presses, of which the following is a specification.

My invention consists of a certain imrovement in the sheet-conveying mechan- ISIII for rinting presses forming the subject of my etters Patent No. 667,604, dated February 5, 1901, the object of my present invention being to prevent smearing of the freshly printed sheets by reason of movement of a conveyer belt over the surface of thes'ame at a time when said sheets are confined under pressure between the two belts. This object I attain in the manner herein after set forth, reference being had to the accompanying drawing, in which- Figure -l is a View of sufficient of a printing press and of the lower portion of the sheet conveying mechanism operating in conjunction therewith to illustrate my present invention; Fig. 1 is a viewof the upper portion of said sheet conveying mechanlsm, and Fig. 2 is an enlarged view of one of .the belt guiding rollers illustratingl the relation in respect to one another of t e conveyer'belts atthe time of their passage around said roller. v

In the drawing, 1 represents part of the frame of an Ordinaryhigh-Speed press, 2 the" delivery fan or fiier'ofthe. same, and 3 a shaft constituting, or driven from, one of the shafts of the press and having a-sprocket wheel 4, for the reception of a chain belt 7 which drives a larger sprocket wheel 8 and passes aroun'd idler ul eys 9, 10, and 11.

The delivery mec anism of the pressis usually provided with a series of delivery. belts 14 disposed side by side, but hereinafter, for convenience, but one of these belts will be referred to as the action of all of them is the same; The belt passes around adrum or pulley 13, loosely mounted on a shaft 12 of the press, and driven at a proper rate of speed by any suitable mechanism. The belt 14 passes around a drum 25 and alsoaround suitable guide pulle s 17, disposed in the course which the be t is designed to travel, preferably in such manner that said belt is. compelled to follow a zigzag course, as shown in t e drawing, the return run of the belt passing over guide ulleys 21.

In connection with the main delivery belt is employed a supplementary belt 16, which is driven by a drum 15 on the shaft of the sprocket wheel 8, and also passes around the drum 25 and the guide rollers 17, the. return run of said belt being properly directed by guide rollers22, and the two belts being so disposed that the printed sheets are gripped between them and carried forward thereby to the delivery point.

So far as described, the mechanism-is the same as before, but in the mechanism as patented, the two belts were always in contact with the printed sheets during their conveyance from the drum 25 to-thepoint of delivery, and as it is extremely difiicult, if not impossible, to drive the two belts always at precisely the same surface speed creeping or crawling of one belt in respect to the other had a tendency tofsmear the freshly printed sheets, especially at the points where the belts passed around the pulleys, and said sheets were therefore subjected to relatively heavy pressure. I find that this objection can be overcome by making one of the belts narrower than the other, and recessing those of the guide rollers or drums which are so located that the narrower b'elt is'innermost when the belts are passing around the same, whereby, during the time that said narrower belt is thus assing around such drums or rollers, it wil be free from contact with the printed sheets, or will not be pressed into forcible contact with the same, the sheet being confined between] the outer belt and those portions of the drum or roller which are of full diameter, as shown in Fig. 2, and those portions of the drum or roller being usually smoothand polished and traveling at the same surface speed as the belt which holds the printed sheets in contact with them. In

.the' present instance I have shown the belt 16 as t e narrower belt, since the belt 14 is the main carrying or driving belt, the function of the belt 16 being to maintain the printed sheets in contact with said driving belt and preventbackward slipping of the same durmg their upward travel. As the printed sheets are not subjected to such heavy pressure when assing those of the ide rollers at which t e supplementary be t 16 is the outermost of the pairas they are when passing those rollers at which the main or driving belt 14 is outermost, I find that the freeing of the freshly printed sheets from contact with the supplementary belt, where" said sheets pass around the latter rollers, is sufficient to grevent the smearing of said she as heretofore been experienced.

I claim ets which 1. The combination, in sheet conveying 5 mechanism for printing .presses, of a pair of conveyor belts, one narrower than the other,

10 and the drum.

2. The combination, in sheet conveying mechanism for printing presses, of a main driving or carrying belt, a sup lementary belt cooperating therewith an of lesser width than the same, and guide drums or rollers for said-belts, those of said drums or rollers at which the narrower belt is innermost being recessed for the rece tion of the same, whereby the sheets are c amped between the wider belt and the drum.

In testimonywhereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

FRANK O. STOOKHOLM.

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