US1545184A - Printing machinery - Google Patents

Description

July 7, 1925.

T. F'. ELSWORTH PRINTING MACHINERY Filed 00$. 22, 1923 2 Sheets-Sheet .1

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I11L11/%O14 118 worth $3 July 7, 1925.

T. F. ELSWORTH PRINTING MACHINERY Filed Oct. 22. 1923 2 Sheets-Sheet 2 Inve miter T E E68 war-271 Patented July 7, 1925.

cairn!) STATES PATENT OFFECE.

THOMAS FRANK ELSWORTH, OF LEEDS, ENGLAND, .AS'SIGNOR OF ONE-HALF TO GEORGE MANN AND COMPANY, LIMITED, OE LEEDS. YORK, ENGLAND.

PRINTING MACHINERY.

Application filed October 22, 1923. Seria1 No. 670,210.

To all whom it may concern:

Be it known that I, THOMAS FRANK Enswon'rrr, a subjectof the King of Great Britain and Ireland, and residing at Rycroft, 15 Davies Avenue, Roundhay, Leeds, in the county of York, England, have invented certain new and useful Improvements in and Relating to Printing lViachinery, of which the following is a specification.

This invention relates to improvements in printing machinery, particularly those of the kind described in United States Patent specification No. 1,210,202,1916.

Reference to the said patent specification will show that the transfer cylinder is geared directly with the continuously rotating impression cylinder, that the revolutions of the cylinders are similar, and that the printed sheet is taken from and re-transferred to the impression cylinder at the same peripheral point thereon, but at a different radius relative to the axis of the said cylinder.

The object of the invention is to overcom the ditliculty experienced with machines of this type in taking one sheet from the impression cylinder without disturbing in any way the other sheet lying underneath since the edges of the two sheets are on the same peripheral point on the cylinder.

With this object, the invention consists in the novel features of construction and the combination of parts to be hereinafter described and more particularly pointed out in the claims.

Referring to the accompanying drawings which illustrate by way of example one embodiment of the invention 2- Figure 1 is an elevation showing the position of the impression and transfer cylinder when the printed sheet is being transferred from the former to the latter;

Figure 2 is similar to Figure 1 showing the position in which the printed sheet is being re-transferred from the transfer to the impression cylinder;

Figure 3 is a sectionalview on line AB of Figure 2;

Figure 4 is a plan view of Figure 1 looking in the direction of the arrow.

The impression cylinder 1 is provided with impression grippers 2 which are operated by any known means. Mounted above the grippers 2 are additional grippers 3 called delivery grippers, also operated by known means, the use of which will be hereinafter described. The transfer cylinder 1 is provided with grippers 5 actuated by rnown means. It is also provided with a toothed wheel 6 gearing with similar toothed wheel 7 rigidly mounted upon the impression cylinder. The toothed wheel 6 is provided with a boss 8 mounted coaxially with the transfer cylinder. On one end of the boss 8 is mountedloosely a member 9 which is fixed to the transfer cylinder by means of nuts and set screws 10 which pass through slots 11 in said member 9. By slackening the nuts the relative positions of the member 9 and the transfer cylinder can be altered so that the position for the co-operation of the grippers can be adjusted. The member 9 is provided with a double guide 12 which is set at an angle to a diameter of the transfer cylinder. In this guide 12 a driving member 13 is provided which is adapted to slide therein.

The toothed wheel 6 is provided with a suitable boss 14 to which is pivotally mounted a rocking lever 15. The other end of the rocking lever 15 is pivotally connected to the driving member 13 by means of a pin 16 orthe like. In this manner the transfer cylinder, 4, is yieldingly connected to the tooth wheel, 6. The other end of the boss 8 of the toothed wheel 6 is provided with a cam member 17' loosely mounted on said boss coaxially with the impression cylinder and connected to the framing of the machine so as to be kept stationary by means of a link member 18. This cam member 17 is provided with internal grooves 19, 19- into which is fitted a switclipiece 20 which slides therein on the rotation of the transfer cylinder. The centre of this switch-piece 20 is pivotally connected to the centre of the end of the link member 15 on the opposite side to which the driving member 13 is pivoted. As the toothed wheel 6 is rotated by the wheel 7, the transfer cylinder and the switch-piece 20 rotate together. The switchpiece 20 as it slides in the grooves 19, 19

rocks the lever 15 either away from or fore the grippers on the transfer cylinder co-operate with the delivery grippers 3 on the impression cylinder instead of the grip =pers Qas in Figure 1.

The printed sheet is retransferred to the impression cylinder at a point on the periphery of the latter different from that at which the sheet was transferred to the trans- -fer cylinder, but this point is situatedat the same radial height "from the impression cylinder.

In the figures the cam 17 is so arranged with two grooves 19, 19 that the switchpiece 20 is displaced so as to perform one revolution in the groove 19 and the next revolution in the groove 19, thus coming back to its initial position after every two revolutions. The machine thus performs two revolutions for each cycle. The cycle need not, however, comprise only two revolutions but any number may be used.

The flange of the toothed wheel-(Sis provided with openings or slots 21 through which the nuts 10 which hold the member 9' one or more revolutions of said cylinder the sheet is transferred to the grippers 5 onthe transfer cylinder at a point on the line -D, the grippers 2 'beingreleased automatically by any well known means not shown in the drawing.

The transfer cylinder rotates, and during its rotation is moved relatively to the toothed advance of the impression cylinder and -co-,[ operates-amth the delu 'ery grippers 3-onthe impression cylinder. At this point the grippers 5 are released and the delivery grippers 3 secure the sheet to the impression cylinder, said impression cylinder then set forth.

described without'depairting from the spirit of the invention.

. Having now described my invention what I claim as new and desire to secure by Letters Patent is 1. In a printing machine, the combination comprising an impression cylinder, a transfer cylinder, gripping means on said transfer cylinder for holding the sheets of paper vand means for alternately advancing and retarding said transfer cylinder relatively to said impression cylinder so that said gripping means may register alternately with twodistinct points on the periphery of saidimpressioncylinder, as set forth;

2. In a printing machine, the combination comprising an impression cylinder, a trans fer cylinder, a plurality of sets of grippers on said impression cylinder, 3. set of grippers on said transfercylinder, and means for alternately advancing and retarding saidtransfer cylinder relatively to said im pression cylinder so that the transfergrippers may co-act alternately with two sets of impression grippers, :as set forth.

3. Ina printing machine the combination comprising an impression cylinder, a. trans fer cylinder, a toothedwheel m'o'un ted upon the transfer cylinder, means ford'riving'the transfer cylinder from the impression cyl inder, and means fora-lternately advancing and retarding one of said cylinders relatively to the other, said means including a yielding connection between said toothed wheel and transfer cylinder together with a cam member and switch plate for varying the position of said yielding connection, as

4;. In a printingnnaehine the combinatimi comprisingan impression cylinder, a transfer cylinder rotating at the same number of revolutions as said impression cylirxler, two "sets of grippers mounted on said impmsskm cylinder, one set of grippers mounted on said transfer cylinder, and means for alter- 'nately advancing and retarding the transfer cylinder :so that its grippers :co-act first with one set and then with the other set ofgri person the impression cylinder, as set fortli.

In testimony whereof 'I have signed my nameto this specification;

THOMAS FRANK ELSWORTH,

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