US979845A - Gripper mechanism for cylinder-presses. - Google Patents

Description

APPLICATION FILED Jun 16, 1910 Patented Dec. 27, 1910.

3 SHEETS-SHEET 2.

NHL

P. GUILLO.

GRIPPER MECHANISM r011 CYLINDEB- PRESSES.

APPLICATION FILED JUNE 16, 1910.

Patented Dec. 27, 1910 w sw 3 SHEETS-SHEET 3.

To all whom it may concern:

earns GRIPPER MECHANISI I FOR CYLINDEZ-ZPBESSES.

Specification of Letters Patent.

Patented Dec. 27, 1910.

Application filed June 16, 1910. Serial No. 567,175.

Be it known that I, HARRY P. GUILLo, of llevere. in the county of Suffolk and'State of Massachusetts, a citizen of the United States, have invented an Improved Gripper illechanism for Cylinder-Presses, of which the following is a specification. I

My ,invention relates particularly to the means whereby pressure is applied to the grippers to cause them to hold the paper firmly against the impression cylinder and also to the means whereby they are caused to-engage and release the paper.

My invention will be understood by reference to the drawings in which- Figure 1 is an end view of an impression cylinder to which mechanism is attached embodying my invention. Fig. 2 shows the other end of the same cylinder together with mechanism embodying my invention in another form as will be explained below,- and Fig. 3 is a front view of the impression cylinder showing the gripper-operating mechanism in elevation-a portion of. the central portion of the cylinder beingomit, ted. Fig. l is a perspective view of the tumbler lever, and Fig. 5 isa perspective view of the spring abutment. I.

In the drawings A. 's the impression cyiinder which is mounted on trunnions in the frame A of the press and is rotated in any convenient way. It may be of any length and cooperate With the feed and other mechanism as usual. It is. provided with a gap )6 of proper character" to receive the shaft B and grippers G as described below. The shaft B is mounted in the end'or hearing walls of the cylinder and, when the cylinder is of sufficient length to require it, in intermediate bearings. This shaft carries the grippers C which depend in number upon the length of the cylinder. They and the shaft and its bearings are of the usual character and need not be especially de-' scribed. They cooperate in the usual manner with front gauges .C afeed board C and strippers C of any; convenient form.

My improvement relates to the control of the shaft B which causes the grippers to close upon the sheet and to open to release the sheet. WVhere the cylinder is short, the

gripper-operating mechanism need be located at one end only. Where the cylinder is long there is danger that the torsion of the shaft will affect the EtCClll'itlt oneration of e grippers and hence the desirability of the use of mechanism at ea'ch'end of the shaft to prevent this torsion.

As showninfi 1, there is mounted on oneend of the shaft B a tumbler lever D so (see Fig. 4) which comprises a casting having a hub (Z containing a socket by means ofwhich it is attached to the shaft B by a pin or otherwise to turn it. On its opposite side it-has a groove open at each end to engage the tumbler stud g or g by which as the cylinder rotates the tumbler lever Will be turned to turn the shaft and lift the. r.ippers as below described. The tumbler ever also has a cam surface (Z and an arm d to .which a spring is connected for holdin the gr1ppers in operative or disengaged POSltlOIlJ,

The spring above referred to is marked E- and is carried on a rod 6 one end of which 7 5 has an enlargement by which it is pivotally attached. to the arm (Z the said.enlargement having a shoulder 6 The other .end

of the rod slides in a block 6 having trunnions a which set into hearings in one end 8'0 of a yoke lever F which is pivoted at F to the cylinder A thus securing a rockin bearing-for that end of the rod 6. One en of the spring E bears against the shoulder e and the other against the block 6", the 285 spring being held under considerable compression. The farther and of the yoke lever F carries a cam roll f which rides on the cam surface (P. It is held against this cam surface by the spring E. The important novelty and value of this construction as it seems to me is the fact that the spring while it is always under compression between the shoulder a and one end of the yoke lever F suflicient to give the grippers: tight hold v on the paper never materially changes its stress. This is because of the. movements of the yoke lever F which turns freely on its pivot F and acts as a floating abutmentto the spring, the cam surface d beingshaped to allow for the necessary movements of the yoke lever at those moments when particular stress,is brought to bear upon the spring. Thus the grippers will always be under heavy tension and at the same time during the releasing movement described below movements of the tumbler which might otherwise increase the stress on the spring will be compensated for by the yiel mg of the yoke lever the amountof which 110.v

is controlled by thecam surface.

The only movement given to the tumbler lever is that which is necessary to move the grippers into and out of engaging relation with the paper and this is accomplished by means of -tumbler studs mounted :in the frame in the. usual we The portion of the irame A shown in big. '3 has in it-two studs g, 9 eachof which is connected to a lever the end of which (9, g is shown in the drawing. "llhis construction is well known and need not be further described.

It is such that at the proper time a stud" sheet.

is pushed into the path of the tumbler to engage it and cause it to turn the shaft B so that the grippers will grip the paper and the study is pnshedinto the path of the tumbler to cause itto turn the grippers to release the paper.

J is a stop which, engages the tumbler and prevents it from being turned too far on the opening of the grippers.

The operation of the form of my invention described above is as follows: Fig. 1 shows in full lines the gripper, gripper tumbler and other parts in gripping position. The pin 9 has been thrown in to engage the gripper tumbler and cause it as it is carried by the cylinder (which moves in the direction of the arrow) to grip the paper It .will be borne in mind that the cylinder rotates continuously. The sheet has been fed While the grippers are open over. the feed board C so that its front edge en- 4 gages the front'gages (3 When the grippers have gripped a sheet the stud g is withdrawn and the cvlinder rotates carrying the front edge of the sheet the desired distance,

say about a. complete; revolution, when the stud g is projected intothe path of the tun1- bier and engages the corner d et the wall. of the cove d 05: the tumbler'as the cylinder continues itemization. This engagement of the tumbler causes its rotation to a sufficient extent to turn the grippers back, the groove allowing the tumbler to pass the stud. This is illustrated in dotted lines in Fig. 1. This rotation of the tumbler tends to comioress the spring- E and would put it to, considerable straln except I Ioz the compensatlng action of the yoke lever F and cam suriaec 0Z upon which runs the roll 7 on the farther arm of theyoke lever F. Such stress is unnecessary, the only time when stress is needed being during the time when the spring must press the grippers against the paper] After its work is finished the stud g is withdrawn and the cylinder keeps on its rotation until as it reaches the sheet-receiving position the stud g is projected into the path of the turnbler and engages it at the proper time, turning it and the grippers into gripping position. The tumbler thus takes the posltion shown in dotted lines in Fig. 1. and there re mains until as the cylinder continues .to rotate the tumbler strings the pin g which has 3 requires it.

the grippers are holding the sheet is coiicen tale with the axis of the shaft, but the rest oi the cam surface is shaped to allow the block 6 which serves as an abutment for the spring, to yield slightly as the-pressure on the spring due to the rotating of the tumbler In Fig. 2 there shown without a groove but connectedwith and controlled by a spring suitably mounted in so far as it bears a.t one end against what may be termed a floating abutment.

The tumbler is lettered B and its cam sur face 1 It has a hub d? by which it is at tached to the shaft 3 from which it derives its motion. its spring is lettered E and it is mounted like the springilil about a rod having a shoulder a" against which one end of the spring rests, and means of pivotal attachment with the tumbler l3 and also against a block 5 like the blocl; e in the end of a slide F This slide F runs a dove-tailed. groove concentric with the cylinder in the bracket F attached to the end of thecylinder and carries at the end opposite is a tumbler constructed as to that against which the spring bears a cam 1 roll 7 which engages the cam surface d. In this case as before a spring having a floats ing abutment serves to control the tumbler under substantially the sametens'ion at all times, the cam surface serving to allow thefioating abutment to yield when any un-' necessary stress is given to the spring due to the turning of the tumbler.

I have showntwo forms of my invention, but I do not mean to limit myse'lfto these forms or to theii precise arrangement. The floating abutment shown in Fig. 53 may he used with the tumbler-shown in Fig. and

the floating abutment shown in Fig. "lmay be used at the farther end of the cylinder if thought bcst.---without change other than would naturally occur to one skilled in the art.

What I claim as my invention is: Y

1. ln.combi11ation with a gripper shaft,

a tumble lever, a floating abutment and a spring one end of which engages said tumbier lever, the other. end of said spri 'ig en gaging said floating abutment, and means for controlling the movements of Said abutnient.

2.111 combination with a gripper shalt, a tumbler" lever, means for turning It, a

floating abut1n.ent,1 and a spring one end of which engages said tumbler lever and. the

other said floating abutment, and. means for controlling the movements of said abutment to maintain said spring at substantially constant tension. 7 a

3. In combination with a grippershaft, a tumbler lever, means for turning it, a, floating abutment, end a spring one end of which engages said tumbler lever and the. other said floating abutment, and means for cont-rolling themovements of said abutment comprising a cainroll connected to said abutment and a cam lo 'ated to control the movements of said cam roll.

4. In, combination with a gripper shaft, a tumbler lever, means for turning it, a floating abutment, and a spring one end of which engages said tunibier lever and the other said floating abutment, and means for controlling the movements of said abutment comprising a cam roll connected to said abutment and :1.- Cam located on said tumbler lever to be engaged'by said cam roli.

5. In con'ibination With a gripper shaft, 2t tumbler lever, means for turning it, a floating abutment, end a. spring one end of which engages.saidtumbler lever and the other said floating abutment, and means for controlling theinovements of said abutment comprising a inovabl'e support for said abutment carryingfa cam roll, a. cam. located on said tumbler lover adapted to be engaged by said can: no?! as and for the purposesset forth.

HA RR Y P. GU Lib" Wit-nee M. .l FLAHERM, Gnome Lenore-m.

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