US284607A - campbell - Google Patents

Description

(No Model.) 2 SheetsSheet 1.

A.. OAMPBELL. ME GHANISM FOR SHIFJ TING THEv ANGLE ROLLERS 0F PRINTING PRESSES. No. 284,607; Patented Sept. 11, 1883,

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A. CAMPBELL. MECHANISM FOR SHIFTING THE ANGLE ROLLERS 0F PRINTING PRESSES.

No. 284,607. PatentedSept/ll, 1883...

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I I T By hLS flttorneys,

N PtrERs. Pmlouuw -l hon Washinllon. n.c.

UNITED STATES PATENT OFFICE.

MOLOUGHLIN, on

NEW YORK, N. Y.

' MECHANISM FOR SHIFTING THE ANGLE-ROLLERS 0F PfilNTlNG-PRESSES.

t IE]i1CIFI(3'ATION forming part of Letters Patent No. 284,607, dated September 11, 1883.

Application filed March 5,1883. (No model.)

To all whom it may concern.

Be it known that I, ANDREW CAMPBELL, a citizen of the United States, residing at Brooklyn, Kings county, New York, have invented certain Improvements in Mechanism for Shifting the Angle-Rollers of PrintingPresses, of which the following is a specification.

I11 mounting the inking-rollers of a printing-press certain of these rollers are mounted to extend obliquely across the line of movement of the reciprocating part to which the ink is to be applied, or on which the ink is to be distributed. Vhen fixedly mounted at predetermined angles, the rollers do not distribute perfectly, as they always present the same points on their surfaces to the same points on the-reciprocating surface.

My invention seeks to correct these defects in the distribution-by shifting the roller so as to change its angle a little at each movement of the reciprocating part, so that it may not present itself at the same angle to the said part twice in a great number of reciprocatory movements of the latter. In fact, I make the movements of the parts incommensurate, so that it may require an almost infinite number of reciprocations to bring the parts-back to their same relative positions as at starting that is to say, it is possible to so construct the mechanism that the angle-roller will not present itself twice at the same angle to the same point on the reciprocating part in amillion revolutions of the printing-cylinder. Thus I am enabled toeffect a near approach'to perfection in the distribution of the ink.

The mechanism I prefer to employ in carrying out my invention is illustrated in the accompanying drawings, wherein Figure 1 is a mutilated side elevation of a part of a printing-press, showing the 0011- struction and arrangement of the mechanism for shifting the rollers.

end elevation of the same, taken on line 2 2 in Fig. 1. Fig. 3 is a plan, and Fig. 4 is a modification, that will be referred to hereinafter.

Let A represent a part of the side frame of a printing-press of any kind, and B a rabbetstrip or angle-strip mounted on and secured to said frame. In the angle of the strip B is mounted a slide, 0, which is retained in place,

Fig. 2 is a sectional but permitted to slide a limited distance longitudinally, by means of bolts a, which play in slots in B. In the slide 0 are mounted the forked swivel-bearings b b for the angle-rollers D. The other ends of these rollers are simi larly mounted; but the forked bearings at that end need not be mounted in a slide.

In order to shift the angle of the rollers, I employ the mechanism which I will now describe.

Iendent from the slide 0 is an arm, 0, which is coupled to aconnecting-rod, (I. On the end of this rod is a strap which embraces an eccentric, e, on a shaft, f, mounted in the pressframe. Mounted also on the said shaft f is a disk or wheel, The shaftf may be made rotative, and the eccentric e and disk 9 be fixed thereon; or the shaft may be fixed, and the eccentric and disk. be mounted loosely thereon. In this case, however, the eccentric and disk must be secured together.

Mounted loosely on shaft f is an arm, 7:,

into the periphery of the disk {1 when the arm is moved forward, and to slip over its surface when the arm is moved backward. The arm k may be caused toreciprocatein anyway; but I prefer to couple its pendent end to a con said rod to a crank, k, on a shaft, Z; This shaft may be mounted in the press-frame and be driven from the same mechanism that reciprocates the bed of the press. When the crank k rotates, the arm h is swung back and forth on shaft f. This causes pawli to bite on disk 9 and rotate it intermittently. The eccentric 6 will also be rotated intermittently, and the slide 0 be thus caused -to move by steps or intervals in one direction a distance equal to the throw of the eccentric, and back again by steps. Now, if the crank k be arranged to bed, it will be seen that each intermittent movement of the rollers will correspond with a reciprocation of the bed, and thus the angle of the rollers will be changed at each of said reciprocatory movements of the bed. Now, if it requires, say, twenty revolutions of crank it to produce one revolution of the disk (/,then the rollers will be capable of assuming ten different angles with respect to the akis of the which bears a pawl or dog, 2', arranged to bite necting-rod, j, and to couple the other end of turn once at each reciprocation of the pressmovement of the bed; but in order to vary these angles to an almost infinite extent I make the circumference of the disk 9 incommensurable with the throw of the pawl i-that is to say, the circumference of the disk is not divisible by the annular intermittent impulse imparted by .the pawl without a remainder. Thus the rollers will not present themselves twice at the same angle to the same part of the reciprocating bed, except at long intervals. The revolutions of the crank k might also be made non-synchronous with the movements of the reciprocating bed, and also incommensurable therewith-that is to say, the crank may not make its revolutions at the same time with the reciprocation of the bed, nor in the same period.

The mechanism may be so arranged that the rollers will shift their angles while the bed is passing under them, or the shifting may be done while the rollers are unemployed.

In lieu of a crank, k, arranged to give a regular oscillating movement to the pawl or dog i, I may employ a cam to move said pawl forward, and a spring, 172, to retract it, as shown in Fig. 4; or any otherwell-known mechanical means may be employed for actuating said pawl.

In lieu of a smooth disk, 9, I may employ a ratchet-wheel with fine teeth, and in lieu of the lifting dog or pawl i, I may employ a friction-brake shoe of a well-known construction.

In order to prevent the disk from being rotated backward, I employ a gravity dog or pawl. a, mounted as shown in Fig. 1.

The rollers may be mounted in such a man ner as to always stand at some angle, more or less acute, with the axis of the movement of the bed. This is shown in Fig. 3, where the full lines show the rollers at their most acute angle with the axis of the bed, and the dotted in this; and I may also employ a crank in lieu of the eccentric c.

Having thus described my invention, I claini 1. In a printing-press, means, substantially the reciprocating bed, and whereby the rollers are presented to the bed at constantly-varying angles, in order to effect a better-distributi on of the ink, substantially as set forth.

2. As a means for shifting the angle of the angle-rollers of aprinting-press, a slide mounted on the press-frame to receive the swiveled bearings of the rollers, the said bearings and mechanism, substantially as described, for inr parting an intermittent step-by-step motion to said slide, substantially asset forth.

3. As a means for shifting the angle of the angle-rollers of a printing-press, aslide mounted on the press-frame to receive the swiveled bearings for the rollers, the said bearings, a connecting-rod, and eccentric arranged to in1- part to said slide a reciprocating motion, a disk, 9, arranged to rotate with the eccentric, and means, substantially as described, for imparting an intermittent rotating motion to said disk 9, substantially as setforth.

4. As a means for shifting the angles of angle-rollers for printing-presses, a slide mounted on the press-frame and provided with bean ings for ,one end of the roller, a connecting-rod V and eccentric arranged to impart a reciprocatory motion to the said slide, adisk, 'q, mounted to rotate with said eccentric, and a radiallymounted pawl, 'i, or itsspecified equivalent, provided with means for imparting to said pawl aswinging reciprocating motion, where by the disk will be intermittently rotated, the distance through which-said pawl moves be ing incommensurable with the measure of the circumference of the disk 9, substantially as and for the purposes set forth.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

ANDREWV CAMPBELL.

\Vitnesses:

D. E. FARRELL, A. R. HILLYER.

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