US2186513A - Margin bar for printing cylinders - Google Patents

Description

Jan. 9, 1940. H. A. w. WOD

i MARGIN BAR FOR PRINTING CYLINDERS Original Filed March 2l, 1954 whNl NQS

Patented Jan. 9, 1940 y IJISJrl-"eosrivr11sA vP.efriarlr OFFICE MARGIN BAR FOR PRINTING CYLINDERSy Henryv A.` Wise Wood, New York, N. Y., assigner to Wood Newspaper Machinery Corporation,

New York, N. Y., a corporation of Virginia Original application March 21, 19734, Serial No.

k 716,560. Divided and' this application yNovember 19, 1936, Serial No. 111,561. RenewedMay e 2 claims. (o1. 1015378) the same length tolerances are permitted so that the margin bar follows the plate and performs its function of holding the straight edge of the plate against thej cylinder; to provide means whereby the plate can grow on the cylinder, as it passes in and out 'of the impression a large number of times, without buckling the plate andr causing trouble Vand Without impairing the margin bars function of holding down the straight edges of the plates; andto provide means whereby the tendency ofthe trailing edge of the plate to crowd against the margin bar while the leading edge works away from it will be avoided and both edges will be securely held against the cylinder. k

Other objects and advantages of the invention will appear hereinafter. f

Reference is to be had to the accompanying drawing, in which Fig. 1 is an elevation showing half the length I of the cylinder and disclosing a movable margin bar carrying a pivoted operating end;

Fig. 2 is a sectional View on the line 2-2 of Fig. 1; Y

Fig. 3 is a longitudinal sectional View on the line 3-3 of Fig. l, and

Fig. 4 is a cross sectional end View, similar to Fig. 2, showing the position the parts assume as the plate cylinder rotates.

A T-slot is provided in the cylinder and on its bottom or floor 34 tapers toward the axis of the cylinder asfit progresses from its outer edge toward the middle of the plate cylinder 2, as shown in Figure `3. A slide 35 is provided to t in the T-slot in cooperation ,with an operating rod 39. The top 34a of the slot is parallel to the bottom in the formshown.

Each T-shaped margin bar 36 is pivotally attached vto the bar 35 by a longitudinal rod 31 and rests on the ledgesZG of two plates P. The pivotal mounting of the margin bar yaccommodates the motions of 'the plates. I'he slide 35 is moved by means substantially the same as described in connection with the original case 716,560 led March 21, 1934. It comprises a member 38 secured to the rod 39 by lock nuts 49.. The rod 39 is shownl parallel to the bottom 34 of the slot. The rod carries a spring 4|, one end of which projects against a bracket 44 fastened to the cylinder 2.` The other end of the spring bears against the slide 35. A collar 43 onfthe rod 39 serves to move. the slide 35 to the right automatically when the plates are to' be unclamped.

.This motion elevates the margin bar 36 fromk the ledges 26 on the plates P and thereby releases them., When the plates are clamped the spring 4l forces the slide 35 tothe left thereby bringing the marginr bars 36 rmly down against the ledges 26.

On account of the longitudinal taper of the floor of the slot, each margin bar lifts, as a whole, away from the cylinder and releases the pressure which has been exerted against the two ledges 26 of each plate P when the plate is unclamped. Any

longitudinal motion of this slide along the T-slot works away from it, as shown in Fig. 4.

The object of `the construction shown is( to l provide means whereby, regardless of the crowding of the plate against the margin bars; on one side and moving away on the other', the pivoted bar 36 rests against both ledges and securely holds the straight edge of the plate against the cylinder.`

It will beseen ytl'ierrefo're that a yieldable construction is shown in the margin bar, or in the relation between two margin bars, so that, if the plates are not manufactured exactly the same length, the margin bar will hold the plateA and perform its function perfectly. Also the plate can grow from passing in and out of the impression andthe margin bar willyield to it so that no buckling will takeplace and there will be no impairment of the eniciency of the margin bar inder .having a slot, of a slide in the slot, said slot .having a slanting iioor and top, whereby, as the slide is moved along the slot it will movek outwardly or inwardly in a radial direction and a. margin bar pvoted to said slide and having flanges for engaging the ledges of two printing plates located adjacent thereto and on opposite sides thereof.

2. The combination with a printing plate cylinder having a'T-shaped slot therein provided with a slanting floor and top surface, a slide in said slot engaging the floor, a rod passing through the slide, an end clamp connected with said slide, Wherebtr when the end clamp is moved longitudinally the rod and slide will be moved longitudinally and the slanting oor will cause the slide to move radially, and a margin bar pivotally mounted on the slide on a longitudinal axis and having flanges on both sides vfor holding printing plates.

HENRY A. WISE WOOD.

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