US1427530A - Means for steadying paper carried by smut-sheet machines - Google Patents

Description

' J. E. GILBERT AND G. W. HARRIS. MEANS m s TEADYING PAPER CARRIED BY SMUT SHEET MACHINES.

APPLICATION FILED MAIL I, I920.

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James E. GILBERT AND ens-nu w. natal-us, or cnicaao, rnninors, ASSIGI-IORS To PATENT GILBERT SLIP-SEEEIING IMACHINE GOMIANY, OF GIcIfLCAG-U, ILLINOIS, A COB,-

IPORA'IION OF ILLINOIS.

MEANS FOR STEADYING PAPER CARRIED BY S1VIUT-SHEET MACHINES.

Application filed March 1,

To all whom it may concern Be it lrnown that we, JAIVIES E. GILBERT and GLENN WV. Haunts, citizens of the United States, residing at Chicago, county of Cook and State of Illinois, have invented a certain new and useful Improvement in Means for Steadying Paper Carried by Smut-Sheet Machines, of which the following is a specification.

Patent Number 966,739 to J. E. Gilbert, issued August 9, 1910, illustrates and claims a machine for taking care of sheets of printed or lithographed matter between the time they receive the impression of ink and the time they are sufficiently dried to prevent offsetting when placed on a pile. roadly speaking that machine includes the use of an intermittently moving and successively folding stripoi cloth between which successive sheetsot printed paper are placed immediatelyon being printed, and in which they are carried until sufficiently dry to be automatically delivered from the machine, all as will more fully appear from the inspection of said patent.

In that machine a section of a continuous strip of cloth is temporarily stretched between supports during which time it is reterred to as aprint sheet support. \Vhile this section of cloth is being fed into position in the support the paper to be taken care of travels along and is carried by it to the position where it is to be smutted by the succeeding section of cloth. A single sheet of paper cannot, for obvious reasons, be carried, far and at a high rate of speed unless retained by some sort of a-device in proximity to this print sheet support. In practice it is necessary that a moving tape or belt be located above the path of travel oi the surface of the print sheet support and a proper distance from it so that any breath of wind tending to elevate the paper 0E from the moving print sheet support will only move it into proximity with the tape and thus the paper will, while moving, be re tained and steadied in its position on the moving print sheet support.

In a machine out the type of said Gilbert patent the cloth, a part o1 which constitutes the print sheet support, is moved by a roller 70 of said patent. This roller starts initially at the position of Figure 21 and travels Specification of Letters Patent. Patgnted A114)! 29 1922 is? n 1920. Serial lilo. 362,534.

through the positions of Figures 22 23. 2 and 25 to the position of Figure 26 where the printsheet support 105 of that figure is attached to a vertical guide of the machine after which the roller is withdrawn from un der the print sheet support and the print sheet il carried thereon. The section of cloth thus stretched as a print sheet support and sustained by the frame of the machine is neces-" sarily subject to sag which means that as soon as the tension of roller 70 is removed at position Figure 26, of said Gilbert patent, and the roller begins to recede from under the print sheet support and print sheet the cloth has a tendency. to sagdown on both sides of the roller 70. This creates by the moving action of the roller, a serious agitation of 'he print sheet support and consequently of the print sheet on it, which tends to throw the now laterally stationary print sheet on the now fastened print sheet support up against the moving tape which was initially provided to guide it into place with consequent smearing of the printed matter on the print sheet. n the Gilbert patent roller 70 travels on a straight track 53 and this injurious result necessarily follows iromthe return of the roller 70 on that straight path. The object of this invention is to so construct the roller moving mechanism viz., the track on which it travels, and so mount it with reference to the sustaining tape mechanism that the injurious results describedare avoided.

The invention consists in means applicable to a machine of the Gilbert patent class, which can be easily and conveniently made, and which operates to obtain the desired obje'ct. Particularly the invention consists in and out of combination, with other parts of the use of a track for the travel or: the roller which carries the print sheet support, as a result of whose use the injurious result is avoided. More particularly the invention consists in features and details of construction hereafter more fully set forth in the specification and claims.

Referring to the drawings in which like numerals denote like parts throughout the several views,

Figure 1 is a side view of so much of a machine of the class described as is necessary to illustrate this invention.

' Figure 2 is a similar view of the machine of the same type constructed under the ,old practice and without this invention, as illustrating the disastrous results which can and do happen.

In each figure the numeral 10 designates a vertical upright frame member across which extends a horizontal bar 12 carrying one or more rollers 14, placed one behind the other as viewed in the drawings, .over which one or more guiding tapes 16 heretofore referred to, travel in the direction indicated by the arrow 18. In Figure 1 the portion of cloth which forms .the print sheet support is designated as 20 While the adjacent portion frequentl referred to in said prior patent asthesmut sheet is marlred 22. The corresponding portions of cloth in Figure 2 are designated respectively 24 and 26. As in said prior patent the cloth referred .to is attached at the juncture of the print sheet support and the smut sheet to a bar 28 adapted when fed over into the position of Figures 1 and 2, to slide downward in suitably formed guides 30 in the frame member 10. As in said prior patent the cloth has been carried over to this position just described by the movement of rollers to a position well to the left of that shown in the figures and. corresponding to that of Figure 26 of said prior patent, after which said roller has been moved in the direction of the arrows 32 to the position shown. The rollers 70 which manipulate the cloth are sustained on a frame 34 carried by track rollers 36 which are reciprocated backward and forward in the trackways, to be hereafter described, by any suitable mechanism, one form of which may be that shown in said Gilbert prior patent. In the structure of this invention shown in Figure 1 .these rollers 36 are supported upon a downwardly curved track rail 38 and held thereon by a parallel guide rail 40, each conforming in general to the curvature of sag assumed by the smut sheet 22 and other sections of cloth 42 previously folded into position in the machine in the manner made clear heretofore herein and in said prior Gilbert patent.

In view of the fact that the track rail 38 is thus curved downward the smut sheet sup port 20 starts to assume its natural clownward curvature, i. e., that of the sheets 22 and 42 almost immediately, that the roller 70 deposits bar 28 and starts to move to the right. The result is that the print sheet 44 carried by this print sheet support also settles down to as low a point as possible with the result that, as shown in the drawing, the right hand end of the print sheet is never elevated to a suflicient height so that it can strike the lower tape 16. For purposes of illustration print sheet 44 has been shown as though it were a comparatively stiff, rigid sheet of cardboard. In practice when lighter paper is used the extreme right hand end may not stick up as does the end of print sheet 44 but the agitation of the paper on the print sheet support caused by the passage of roller 70 to the right is suflicient so that almost any part of the paper might fly up and strike the moving tape 16 were the track of this invention not used as shown in Figure 1.

Figure Qshows the disastrous result which occurs in ordinary practice where the roller 70 is guided by a perfectlv straight trackrail 50 which utterly fails to conform to the downward curvature of the sheets of cloth 26 and 52, the latter corresponding to In this case the left hand end of the print sheet 54, especially designated 54, strikes against the lower moving tape 16 with the resulting smearing of the inkimpression on the print sheet 54. As before, if stiff cardboard is not used roller 70 agitates the softer paper sufiiciently so that almost any part'of it may fly up and strike the moving tape.

To a layman the structure may look simple but in actual practice it has been anything but obvious and has proved so desirable that machines actually installed with straight tracks have been altered at the cus tomers expense to install adevice of this invention.

Having thus described our invention what we claim as new and desire to secure by Letters Patent is 1. In mechanism of the class described, a suitable frame, a flexible print sheet support, movable from a position outside the machine to a position where it is stretched approximately horizontally across the ma chine, means carrying the print sheet support to said stretched position and witlr drawing from under said print sheet support and in substantial contact therewith, a track guiding said print sheet support moving mechanism so shaped that in withdrawing the print sheet support it is given a minimum amount of agitation by the passage of said supporting mechanism.

2. In mechanism of the class described, a frame, a flexible print sheet support stretchable across the frame, a stretching mecha nism, and a track traveled by the stretching mechanism in placing the print sheet support across the frame conforming approximately to the curvature of the sag in the stretched print sheet support.

3. In mechanism of the class described, a supporting frame, a print sheet support, print sheet support moving mechanism for stretching said support across the frame, a print sheet being carried therewith as it is stretched, means above the path of travel and the print sheet support as it moves to this position adapted to retain the-print sheet on the print sheet support, and a track guiding said print sheet support moving mechanism as it is withdrawn from underneath the print sheet support which so guides said moving mechanism that the print sheet on the support is not thrown into contact with the guiding mechanism.

4:. In mechanism of the class described, the combination of a frame supporting a tape movable longitudinally thereof, a print sheet support stretchable across the machine below said tape, and in proximity thereto a moving member moving in contact with the underside of said print sheet support to place it in position and withdrawing from said position in a path immediately underneath said print sheet support, and a track device for supporting said print sheet moving mechanism curved distinctly away from the path of travel of the tape with the result that movement of the print sheet moving mechanism from under the print sheet support does not sufiiciently agitate paper on the print sheet support to cause it to engage the tape.

5. In mechanism of the class described, a suitable frame, a flexible print sheet support stretched approximately horizontally across the machine, means requiring movement across the frame in approximately the plane of the print sheet support and in substantial contact therewith, a track guiding said means which requires movement, so shaped that as the latter is moved across the machine it gives a minimum amount of agitation to the print sheet support.

In witness whereof we have hereunto subscribed our names.

JAMES E. GILBERT. GLENN w. HARRIS.

Witnesses:

CHAS. E. GILBERT, DWIGHT B. CHEEVER.

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