US73195A - Island - Google Patents

Description

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C. POTTER, JB., OF WESTEBLY, RHODE ISLAND.

Letters Pat/:nt No. 73,195, dated January-7, 1868.

IMPROVEMENT IN PRINTING-PRESSES.

TO ALL WHOM IT MAY CONCERN:

Beit known that I, C. POTTER, Jr., of Westerly, in the county of Washington, and State of Rhode Island, have invented a new and useful Improvement in Drum-Cylinder Printing-Presses; and that the following description, taken in connection with the accompanying drawings hereinafter referred to, forms a full'and exact specification of the same, .wherein I have set forth the nature and principles of my said improveme'nt, by which my invention may be distinguished from all others of a similar class, together with such parts as I claim, and desire to have'seeured to me by Letters Patent'.

This invention consists in hanging or arranging the cylinder of that kind of printing-presses known as the drumfcylinder, in such a. manner that the cylinder may be raised at any time or at the will of the operator, so as to -be inoperative or incapable of giving any impression.

The object of the invention is to give the operator or attendant entire control over the pressure-cylinder, so that in case of a sheet of paper being improperly set or presented to the cylinder,` or. the failure'of a sheet being presented to it at all, the pressure-cylinder, by being raised, will obviate many diiculties attending the above-mentioned contingencies. In the accompanying sheet of drawings- Figure 1 represents a. side sectional view of a press provided with my invention, taken in the line x ir, iig. 2.

Figure 2, a front view of the same. i

Similar letters of reference indicate like parts. y v

A represents the frame of a drum-cylinder printing-press, and B the reciprocatingr form-bed thereof. These parts may be of usual construction, and therefore do not require a special description. C represents the drumcylinder, which is constructed as usual, but hung in a novel way1 as follows: The shaftD of this cylinder-passes -eccentrically through its bearings E E, as shown clearly in ig. 1, and these bearings are fitted in boxes F,

which are placed between guides a a, at each side of the frame A, and are adjusted at a greater or less height by 'means of set-screws Iz. The bearings E E are allowed to turn freely in the boxes F, and each bearing has a toothed segment or partially-toothed pinion, G, keyed upon it, (see iig. 2,) and these segments or pinions gear into segment-racks H H, which are at the upper ends of radius arms I I, connected at their lower endsto a shaft, J, in the lower part of the frame A. 'On one end of the shaft D of the drum-cylinder, there is keyed a wheel or pulley, K, having a bar, c, attached to its inner side, and to one side ofthe frame A there is attached a bent lever, L, which, when its outer end is pressed down, bears against the radius armfIin the rear of it, and throws the rack- H at the upper end of said arm backward, thereby turning both pinions G, as both radius arms I are operated in consequence of being connected by the shaft J, and both bearings E will be turned, and the drum-cylinder C raised so as to be free from the form on hed B, owing to its shaft D passing eccentrically through said bearings. The drum-cylinders only remain elevated during one revolution of the d1'un1cylinder C, as the bar c on the inner side of the wheel or pulleys K, comes in contact with a` pin, al, projecting from the segment H, which is by the side of the wheel or pulley K, and throws said 4segment back to its original position, so that the drum-cylinder is automatically lowered to a working position in time to receive a sheet and press it upon the form on bed B.

In printing, the advantages derived by having the press so constructed that the impression may be thrown of at thewill of the operator without stopping the press are many and important, and among them may be enumerated the following:`

If the feeder or operator fails to get the sheet properly to the guides, the sheet, if taken at all by the nippers, is printed out of register and is spoiled, and both the paper and presswork are lost. This occurs often, and is the source of great loss in printing.

Again, if the nippers fail to takethe sheet atall, then the impression is taken upon the blanket, the tympan-1 sheet, or the overlays, in which case, the next two or three sheets are spoiled by the offsetting ofthe ink from the blanket, or tympan-sheet, or overlays g' but what is of much more serious consequence many times, is, thatv the overlays, which sometimes take days in getting ready for a single form, are, after a few false impressions,- so injured as to require to be made over again.

Again, in very tine work', much rolling of the form is required, and for such work the presses have to be made with additional rollers, as the forms pass under the inkingrollers and back but once to each impression,

"lds 2 thereby rendering necessary very great additional cost in their construction, while they are still liable to the' same objections enumerated in the two preceding paragraphs; while, if the impression could be prevented being taken, at the will of the operator, he could roll or ink his form as many times as he liked before taking the' impression. i I

So important, in fact, are these points in presses, that most of the book-work, and by far the largest share of the ne cut-work, are done on the bed and platen" press lrnown as the Adams patent press, having the facilities for throwing olf the impressions, and the advantages thereby derived as enumerated above, while in the presses known as cylinder printing-presses, wiz, those having a reciprocating form or type-bed, and a con tinuous rotary movement of the cylinder, giving an impression to each revolution of the cylinder, it, though exceedingly desirable, has never been accomplished, though the latter class 'of presses are, at the present day, probably more numerous than any other in use.

I have, in my improvements now made, accomplished. successfully the desired result, and the important parts of it are shown in the drawings accompanying this application. And in order to enable others to make and use said invention, the following description isvgiven ofthe saidimprovement I vIn the model, the shcet-nippers were not made, but their position indicated only, and the time of taking the sheet is immediately after the nipper-edge of impression-surface, as indicated, passes out from under the feed-table, when the cylinder is revolvedl in the direction of the arrow, and the time for impression to commence is when the nipper-edgc, thus indicated, comes into a position next the bed H, vertically, under vthe shaft of the cylinder. l l

Having thus described my invention, I claim as new, and desire to secure by Letters Patent, in printingpresses known as cylinder printing-presses, having a reciprocating form-bed for holding and carrying the type, and a cylinder having a continuous rotary movement, and making one revolution to each impression, working in combination with the bed impression- Il.V The combination of the eccentric bearing E, adj ustablc box F, segmental pinions G, segments H, lever L, and cylinder C, substantially as described for the purpose specified.

v 2. The wheel K and cam c, in combination with the eccentric bearing E, for the purpose of returning the cylinder after having been lifted to its original position before taking a sheet, substantially as herein shown and described.

C. POTTER, JR.

Witnesses:

WM. F. McNAMAnA, ALEX. F. ROBERTS.

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