USRE3500E - Improvement in printing-presses - Google Patents

Description

tluitd glatte To all whom it mwy concern..-

Beit known that I, LEMUnL T. WELLS, of the city and county of St. Louis, in the State of Missouri, have invented a new andruseful Improvement in Printing- Presses; and I hereby declare the following to be a full, clear, and exact description thereof, reference being had to the accompanying drawings, making'part of this specification. Y

It being necessary, for convenience of feeding, that the platen should stand at about an angle of thirty degrees from the horizontal, it is customary, in order to secure the above position, and at the same time to econ-I omize the power expended in opening and closing the press, to give the type-bed a leaning position forward.

This feature is objectionable, particularly in printing large forms, because the central type, beinginefiimotion ofthe press, and this takes place occasionally, even when the clamps are forced so tight as to injure the type which is situated at the margin.

Another circumstance which renders the swinging platen ill adapted to large sheets, is the great power that is required to swing the arms and platen suficiently to afford the requisite opening for feeding and delivery.

By my plan of construction, I am able to produce a lwide opening, by means of a short, powerful crank.

It is my aim, in this invention, to extend the use f'ulness of the vibrating press, by presenting the bed and platen in their most convenient respective positions, both for printing and for feeding, without too great an expenditure of power in swinging the arms, and without the liability of' displacing the-type.

In the accompanyingdrawings` Figure 1 is a side elevation of -a my invention; y

Figure 2 is a rear elevation; and Figure 3, a front elevation. thereof. The actuating-mechanism,and the various devices' for gathering, distributing, andl applying the ink, not diliering essentially from other plans now in use, need no specific description.

The bed-I is permanently attached, in a vertical or somewhat back-leaningA position, to the frame.

The arms V may be' vibrated by the usual crank R and pitman S, the length of the latter being adjustable by-a suitable screw, T, or its equivalent. b

The platen U, instead-of havinga uniform vibration with the arms V, is capacitatedA for a distinct rotation upon a pivot, X X.

press embodying ciently sustained, are liable to be shaken out by the v LEMUEL T. WELLS, or sT. LOUIS, MISSOURI. Letters Patent No. 12,568, dated M arclt 20, 1855; extended seven years; reissue No. 3,500, (la-ted .Time 8, 1869.

vINHPROVEN!!!N' T IN PRINTING-PRESSES.

The Schedule referred to in these Letters Patent and making part of the same.

This distinct rotation is effected bythe reaction of a stationary pin, a, projectingfrom the frame, and against' which, at a certain-stage of its opening motion, the lower portion of the platen impinges. This results in a compound motion of the platen, as follows:

The platen, at first n'oving with the arm a distance suficivnt to lift the sheet square off ofthe type, then impinging against the pin n, the lower edge is held nearly stationary, while the upper or outer edge immediately' sinks or settles down, so'as to present the platen` in any approach to a horizontal position that. may be deemed to best facilitate the action of feeding.

The term rotatiom in the p'necedingand subsequent passages of this specification, does not imply a complete revolution, but such partial rotation as may be requisite to effect the object in view.

The sheets being customarily pointed (adjusted to their place) at their lower edge, this' nearly stationary condition of the lower .part of the platen at the time of feeding is of the greatest convenience, and very much expedites andfacilitates the accurate placing of the sheet, the hand not having to place and adjust the sheet upon a retreating surface. v

The facility for any desired opening of the platen without much expenditure of power, and also the secure position of the type, enable me to apply this most economical form of press than are now practicable. When not under the action of' the pin n, the lower edge of the platen is held down firmly against the arms V by the spring X and rods W; but I do not desire to be understood as confining my claim to any specific means of rotation or retraction, as the former may Abe accomplished by a link, eccentric-groove, orv other device, and the latter by a c'am or weight.

I claim herein as new, and of my invention- 1. A turning or partially-rotating platen, upon a vibrating armor arms, substantially as and for the purpose set forth.

2. The platen U, hinged or pivod to vibrating arms V, in combination with the stationarylpin or pins n and retracting-springs X,or equivalent devices. for the purposes explaine A In testimonyl of which invention, I hereunto set my hand.

LEMUEL T. WELLS. Witnesses:

Oms. WELLS: y

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