US111776A

US111776A - Presses

Info

Publication number: US111776A
Authority: US
Publication date: 1871-02-14
Anticipated expiration: 1888-02-14

Description

ditched glatte are can.

Letters Patent No. 111,776, dated February 14, `1871.

'IMPROVEMENT IN ADJUSTABLE ATTACHMENTS OF CAMS FOR FLIERS `OF PRINTING- PRESSES.

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

To all whom, it may concern.-

Be it known that I, CHARLES POTTER, Jr., ofPlainfield, n1 the county ot' Union, in the State of -N ew Jersey, have invented a new and useful Improvement in Printing-Presses; and Ldo hereby declare that the following is a full and exact description thereof. My invention relates to il'nprovements for operating the fly which removes the sheets. It has been come mon to operate these by a cam or wild-cat which lifts the fly every time during a portion of its' revolution by a wedge-like operation, and allows it to fly downward again by the action of a spring. It is necessary that the period of this release andfly movement shallbe changeable with each change in the size of the sheets. Itis also desirable that the cam or wild-cat7 which I will hereafter term simply the cam, shall be readily removable when under some circumstances it is desirable to opera-te the cam withoutthe fly, and shall induce noserious evils when a press, through any mismanagement or carelessness, is turned backward.

My invention fulfills all these conditions very successf'ully.,

I will proceed to describe what I consider the best means for carrying ont my invention.

The accompanying drawing forms a part of this specification.

Figure I isa side view of the cam, with the novel Afastening and adjusting means. v

Figure II is a section on the line-S Soi' Fig. I.

Figure III represents the modification of the forms of the parts which I consider equivalent.

Similar letters of reference indicate corresponding parts in all the figures.

A is a shaft, and B is the cani which is to be adjustahly held thereon. lhe shaft A is contracted a little where it receives the cam, and it terminates a little within the hub of the cani.

A' is a terminal piece fitting on or close Vto the emh of the shaft, and compelled 'to turn therewith by means of pins a a, which are fixed in the piece A, 'and project into holes in the shaft A, as represented.

- C is a thumb-screw, which confines the terminal piece A to the shaft A, andholdsit nearly in contact' v with the end of the shaft, or allows it to move away therefrom within considerable limits, according as the screw C is adjusted.

Directing attention now to the modification shown in Fig. II, it will be seen that the cam rests against the perpendicular shoulder on one side, andy is pressed.

against that shoulder bythe force of the screw C applied through the medium of the-piece A', which latter is conical and tits into a corresponding conical seat on the adjacent end of the hub of the cam.

Directing attention now to Fig. III, it will be observed that the construction is similar except that the shoulder on the shaft A is conical, and that the corresponding or adjacent surface of the cam is corref spondingly excavated, while the piece A ts ainst the other end of the hub, with a shoulder which is perpendicular to the axis.V Either form may be used with success.

IVith either form, by slacking the screw C, and thus releasing the terminal piece A', the latter moves ax' tracts its diameter, at or near the point of entering the A cam, bythe letter m, and. I will designate the surface on the opposite end of' the cam, which may also be termed the end of the hub of the cam, by n.

The cam is held against turning around entirely by the friction or traction at these points. The traction on the surface m'conveys the force directly from the shaft A to the cam. The traction on the surface m con veys thc`force bet weeu these parts indirectlythro ugh the medium of the terminal piece A. But as the latter is compelled to turn with the shaft through'the medium of the strong pins c a, the effect is the same whether the principal part of the force is derived through the surface on or the surface n. A,

'Ihe tract-ive force is increased with a given amount of end pressure by making the surface conical. In the form shown in FigfII more than halfthe force is transmitted throughthe piece A'. In the other form, Fig. Ill, more than half is transmitted directly. I

can make either of the surfaces conical at pleasure.

I caninake both conical with good'effect, in which case the terminal piece A and its adjacent surfaces will be as shown in fig. II, while the snrfacem' will be also conical, as shown in fig. III. It may be also practicable to construct the work successfully with both of the shoulders perpendicular, but I have not tried this,'and I do not propose to. 1 esteem the conical surfaces very greatly preferable.

lhe ordinary mode of fixing the cam upon the shaft is by inserting a set-screw or pinching-screw through the hub and bearing against the shaft diametrically.'

There are several evils incident to this arrangement which my invention eompletely'avolds. The shaft is liable to become indented by the point of' the screw, and such indentations interfere greatly with any subsequent nice adjustment. f The cam with such arrangement can beadjusted at points widely differing from its former position, or it may be adjusted exactly in its former position, but it l cannot be adjusted near it without liability of the end of the screw slipping into the dent and bringing the cam toits old position.

Another serious evil with the old arrangement is the injury t'o the surfaces, when in consequence of a turning of the machine backward the earn is hooked against the fly-rod, and is forcibly held so' thatit cannot be turned while the shaft continues to revolve.

This causes an abrasion of the snrface of the shaft I find, with the conical surfaces, thatl 'a moderate pressure of the screw C is sufficient .to hold the cam. Y The cones must not be made too tapering. I esteem it important that the cani shall be able to slipin case of any extraordinary strain.

A special advantage due to my invention which has not yet been referred to, is the nearly complete cern tainty that the screw Ojwill slaeken of litself when the printing-press is turned backward so as 'to hook orarrest the cam. Y

The friction of the piece A', under the' wide collar" of the vscrew U, is su'eient to turn it backward under such circumstances and set the cam free. All' that is necessary in such case then is to readj ust the cam, and the press is ready to work as before, without anypart having been strained.

I claim as my invention- The within-described improvement in the tlymech` anism 1n printing-presses, consist-ing of the terminal piece A', and the locking means a, arranged to serve relatively tothe shaft A, the'axially-adjusting,r -mean's O, and ily-cam B, substantially as and for thel purposes herein set forth.

In testimony whereof I have hereunto in presence of two snbseribing witnesses.

C. POTTER, JR,

set myun'ame Witnesses THOMAS D. Swanson.

U. C. LIvINGS.