US1692814A - Printing press - Google Patents

Description

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2 Sheets-Sheet 1 IN V EN TOR ATTORNEY Nov. 27, 1928.

Filed April 20, 1923 I Nov. 27, 1928.

M. W. BRUESHABER PRINTING PRESS 2 Sheets-Sheet 2 Filed April 20, 1923 Patented Nov. 27, 1928.

UNITED STATES PATENT OFFICE.

MARTIN W. BRUESHABER, OF CHICAGO, ILLINOIS, ASSIGNOR TO GOSS PRINTING PRESS COMPANY, A CORPORATION OF ILLINOIS.

PRINTING PRESS.

Application filed April 20, 1923. Serial No. 633,399.

The invention relates to printing presses and more particularly to novel means in rotary printing presses to insure steady and true running of the form cylinders, especially at high speeds.

Objects and advantages of the invention will be set forth. in part hereinafter and in part will be obvious herefrom, or may be learned by practice with the invention, the same being realized and attained by means of the instrumentalities and combinations pointed out in the appended claims.

The invention consists in the novel parts, constructions, arrangement-s, combinations and improvements herein shown and described.

The accompanying drawings, referred to herein and constituting a part hereof, illustrate one embodiment of the invention, and together with the description, serve to explain the principles of the invention.

Of the drawings:

Fig. 1 is a. fragmentary side elevation with parts in section and with parts shown more or less diagran'imatically of a portion of a printing press embodying the invention;

Fig. 2 is a fragmentary detail vertical section showing on an enlarged scale the parts at the central left hand side of 1;

Fig. 3 is a fragmentary top plan, with parts in horizontal section, and with parts broken away on the line 33 of Fig. 1

Fig. 4 is a view showing a modified form of the device; and

Fig. 5 is a fragmentary section corresponding to the lower central partof Fig. 3, but showing a portion of the form cylinder in secti on.

The invention is directed to insuring steady and true running of the cylinders of a printing couple, and especially the form cylinder, in fast rotary presses, and especially to effecting this without necessarily in anywise chang ing the standard construction of the printing couples, inking mechanisms and coopcrating parts.

More particularly the invention provides means bearing on the surface of the form cylinder, and acting substantially or approximately in the line of, and in opposition to, the printing thrust between the form and impression cylinders, the device being simple and inexpensive, occupying but little space and being located ina convenient place and, as stated, necessitating no changes in the usual construction of a standard press.

More particularly as embodied, in a press having the cooperating plate and form cylinders of multi-nlate length, usually fourplat-es long, the form cylinder has, in fixed position thereon, the centrally-located plate-retaining or clamping ring of usual construction. concave shoe, or other bearing member, bears against this stationar plate-clamping ring. and is located approximately substantially in the line of the printing thrust exerted between the cylinders, that is, it has an effective and sufficient component of pressure along the line of thrust to efficiently perform the steadying and truing function.

The shoe is mounted on a cross beam which is preferably conveniently located between the form inking rollers and in a position not to interfere with the handling of the form rollers or any parts of the mechanism. The shoe or like bearing member is. regulable or adjustable as to its pressure upon the form cylinder. The steadying and truing device may be mounted directly on the line of the printing thrust except where this will render the handling of the form rollers or other parts di'llicult. or unhandy.

Other features of the invention will be primarily set forth in connection with the following detailed description of the invention, but it will be understood that the foregoing general description and the following detailed description are illustrative and exemplary but are not restrictive of theinvention.

Referring now in detail to the embodiment of the invention illustrated by way of example in the accompanying drawings, a printing couple is shown, having a form cylinder 1, with a. shaft 2, which is journaled in bearings 3 at either side, these hearings being carried in the side frames 4 of the press. The web of paper 00 is shown running about the ii'npression cylinder andbeing printed upon by the form or plate cylinder. I

Cooperating with the impression cylinder 1 is a form cylinder 8, having a shaft 9 journaled in bearings 10, which are likewise carried in the side frames 4 of the press, these bearings being shown in a conventional man- A suitable inking mechanism (shown in part only and more or less conventionally) supplies ink to the plates upon the form cylinder, and as shown, form rollers 11 and 12 are mounted in the usual manner, and are run in "contact with the semi-cylindrical plates on the form cylinder. The form rollers are supplied with ink by an ink drum 13, and this in turn is supplied bv any suitable mechanism from an ink fountain (not shown).

The semi-cylindrical stereotype plates, or other printing plates 14, are held upon the cylinder by suitable means, the usual means being a series of clamping rings, and the pres ent invention is shown preferably applied to such a standard construction and arrangement. The form cylinder is of muitiplal'e length, and a plate clamping ring 15 is carried in xed position centrally of the cylinder, the ring having the usual beveled undercut along each side thereof, beneath which the correspondingly beveled arcuate edges of the printing plates fit to hold them in position. A plurality of intermediate plate-clamping rings 16, which may be of the usual type or form are shown, these being movable or positionable longitudinally of the cylinder to receive, to hold and to release the plates in the usual manner. Likewise plate clamping end rings 17, which are also movable lengthwise of the cylinder for holding two outside plates or series of plates are shown.

In the preferred embodied form of the invention, the cylinder-engaging steadying and truing member is a shoe 25, having an arcuate face 26 shaped and positioned to bear on the cylindrical outer periphery of the stationary or fixed plate-clamping ring 15. This shoe is variably and regulably positioned so as to bear upon the clamping ring with sufficient force to compel the form cylinder to run true, and to prevent any wabbling or sag of the cylinder, while on the other hand the friction is not such as to be practically objectionable. This steadying and truing pressure is applied medianly and in fact preferably absolutely centrally of the form cylinder, and is applied successfully and effectively to the periphery or exterior of the ordinary cylinder structure without requiring any changes to be made therein. 7

The pressure is also exerted approximately, or to a highly proportionate degree, in the line of the printing thrust between the form cylinder and the impression cylinder. In the drawings this steadying and truing device is ap plied between the form inking rollers 11 and 12, as this constitutes a convenient location therefor where it will not interfere with the handling of any of the usual mechanism.

The steadying and truing shoe, or equivalent device could be optionally applied above the form inking roller 11 and absolutely in the line of the printing thrust exerted between the cylinder. In its present position a very large, and sufiicient component of the steadying and truing pressure is exerted along the line of printing thrust.

In the embodied form of mounting for the steadying and truing device, a beam or strut 27 extends across between the side frames 4 of the press, and at its ends it has flanges 28 and 29 abutting on the inside faces of the side frames 4 of the press, and secured thereto by bolts 30. In the preferred form there are also incorporated devices for variably positioning the shoe, or other steadying and truing member, to regulate its relative position and consequcntlv the amount of pressure exerted upon the form cylinder. As embodied, the central part of the beam 27 is cut away to fit the width of the shoe (as will be best seen from Figs. 3 and 5) and the shoe is preferably seated upon a supporting bar 35, fixed to the beam 27 in suitable manner, as by screws 36, the bar extending across the opening or recess in the beam, and the shoe resting upon the top thereof.

Also fitting slidingly in the recess in the beam 27, behind the shoe 25, is a beveled wedge or block 38, the rear surface 39 of the wedge resting against the back wall 40 0f the opening in beam 27, and the front surface 41 of the wedge being in contact with the rear surface 42 of the shoe 25. The block is slightly beveled upwardly and forwardly in Fig. 2 so that as it is moved downwardly it will cause the shoe to move outwardly and to exert greater pressure on the form cylinder, and when the wedge or block 38 is moved upwardly the reverse will he the case.

The embodied form of means for movingthe block 38 comprises a bolt 45 fitting rotatablv in a longitudinally disposed aperture in the wedge or block 38, and having a retaining nut 46 screw-threaded on the bottom end thereof. On the upper face of the block 38, the bolt 45 is shouldered outwardly and is of increased diameter, and this part is provided with a screw'thread 49, which screws into a tapped screw-thread 50, formed in a corresponding orifice or opening in the top of the beam 27. Thus by rotating the bolt 16, by a screw driver or other convenient tool inserted 1 into the slot 51, the block 38 may be moved upwardly or downwardly, and the shoe 25 thereby moved inwardly or outwardly slightly in a radial direction with respectto the from cylinder and the plate clamping ring 15 upon which the shoe bears, to regulate the pressure upon the form cylinder.

In Fig. 4 a modified form is shown wherein a plurality of rollers 58 and 5a are mounted in'the shoe 25 the rollers in this case constituting the elements bearing upon the ring 15, although the intermediate part or parts of the shoe may also be used as a steadying andtruing surface. For most uses, however, the shoe 25 bearing directly upon the plate clamplU-i ing cylinder, as shown in the preceding figures and as already fully described, will be found preferably and most efiicacious.

The invention in its broader aspects is not limited to the specific mechanisms shown and described but departures may be made therefrom Within the scope of the accompanying claims Without departing from the principles of the invention andwithout sacrificing its chief advantages.

lVhat I claim is 1. A rotary printing press including in combination a form cylinder, an impression cylinder, means for supplying ink to the form cylinder comprising an ink drum and two form rollers, and a member engaging medianly With the exterior of the form cylinder to insure true running thereof, said member being mounted in the space between the ink to resist the major component of thrust from i the impression cylinder.

2. A rotary printing press including in combination a form cylinder, an impression cylinder, means for supplying ink to the form cylinder comprising an ink drum and tWo form rollers, and a variably positionable, concave bearing member engaging medianly With the exterior of the form cylinder to insure true running thereof, said member being mounted in the space between the ink drum, form rollers and form cylinder so as to resist the major component of thrust from the impression cylinder.

In testimony whereof, I have signed my name to this specification.

MARTIN W. BRUESHABER.

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