US2078378A - Apparatus for and method of cooling a printing couple - Google Patents

Description

p ilzflwsz I G. A. PRESS 2, 78,378

APPARATUS FOR AND METHOD OF COOLING A PRINTING COUPLE Filed July 20, 1935 h r. 3i I I O I I. H: I I LL- "m g I I I I: 1 -5 I *I- m I I N I II N I IIII l-r I I f I I l I I I I lml ll In I I III III l I I I I I l .90 I I 234 I I I I I I I: I I I I I l u I I I ,I

I l I I I I W I l dp In I... 2? TO R 9 11' N i I B Y MUM ATTORNEYS I Patented Apr. 27, 1937 UNITED STATES PATIENT OFFICE APPARATUS FOR AND METHOD OF COOL- ING A PRINTING COUPLE tion of New York Application July 20,

2 Claims.

My invention relates to a new and improved method of cooling a printing couple, and to a new and improved apparatus for cooling a printing couple.

One of the objects of my invention is to provide improved means for cooling a printing couple which is used in rotary gravure presses.

Another object of my invention is to provide a mechanism whereby the impression roll oi a. printing couple is directly cooled.

Another object of my invention is to provide a simple and efilcient mechanism for this purpose.

Other objects of my invention will be set forth in the following description and drawing which illustrates a preferred embodiment thereof, it be-' ing understood that the above statement of the obJects of my invention is intended to generally explain the same without limiting it in any rranner.

Fig. 1 is a front elevation, partly in section, illustrating one embodiment of my invention.

Fig. 2 is'an end elevation of Fig. 1.

Fig. 3 shows a modification. This is an elevation, partially in section.

The invention is described particularly with reference to a rotary gravure-machine. However, the invention is not necessarily limited to this type of printing press.

The ordinary rotary gravure printing press has a rotating form cylinder I, and a rotating impression cylinder 2, having a sleeve or jacket 3, which is made of rubber or other resilient material.

The form cylinder l is .suitably etched, corresponding to the picture or other matter which is to be printed.

As shown in Fig. 1, the rubber sleeve 3 has a peripheral portion which is forced with suitable pressure against the form cylinder I.

The web of paper W is led between the form cylinder l and the resilient sleeve 3.

In apparatus of this type, the peripheral part of the rubber sleeve 3 is deformed by the pressure along the area of contact with the web W. The pressure deforms a part of said peripheral part of the rubber sleeve 3, from its predetermined and normal cylindrical contour. That part of sleeve 3 which is not directly adjacent the web W springs back to said normal cylindrical shape. The deformation results in the heating of the sleeve 3, thus lowering the life thereof, epecially ii the printing press is operated at high speed. 1

In order to force the sleeve 3 against the form cylinder I, with suitable pressure, a cooling and pressure cylinder 4 is utilized. This cooling cylinder 4 can be filled with water or other cooling 1935, Serial No. 32,378

medium, and if desired, any suitable cooling medium, such as water, a gas or the like, can be continuously forced through the cooling cylinder 4, in order to cool the same and to maintain it at any desired temperature.

The printing press is provided with a frame F, of any suitable construction.

A slide S is mounted for vertical sliding movement, at each end of the frame F.

The up and down sliding movement of the slide S, is guided by means of guide members 5 and 6, which may be integral with the frame. Each slide S is provided with end plates 1, which are connected to said slide by means of removable lastening members 8. The plates 1 overlap and slidably contact with the guides 5 and 6.

i The cooling roller 4 is mounted in suitable bearings which are provided in the slides S, so that the cooling roller 4 moves 41p and down in unison withthe slides S. Likewise, the ends of the impression roll 2 are mounted in bearings B, which are connected to the slides S.

The printing press is provided with any suitable means (not illustrated in the drawing) for forcing the slides S downwardly, until the peripheral portion of the sleeve 3 is forced against the web W, with the desired pressure. The periphery of the resilient sleeve 3 is also pressed against the cooling cylinder 4 so that the said cooling cylinder 4 contacts with any suitable predetermined area of said periphery of the sleeve 3, thus producing a strong cooling effect. Any suitable means (not shown) may be utilized for forcing cooling roll 4 against the periphery of sleeve 3. with any desired pressure.

The cooling roll or cylinder is provided with an inlet pipe Ill, and an outlet pipe H, so that water or any other medium can be forced continuously through the cooling cylinder 4. The

. cooling cylinder 4 can becompletely filled with water (if this is the cooling medium) or said cooling cylinder 4 can be partially filled with water or with any, other cooling liquid.

It will be noted that the resilient sleeve 3 is directly cooled by means of conduction, along a zone or area which is spaced from the zone or area which is pressed directly against the web W.

The cooling roll 4 and the rubber sleeve 3 turn in unison. I prefer to have the cooling roll 4 of greater diameter than the enlarged peripheral portion of the resilient sleeve 3, but I do not wish to bev limited to any particular ratio in this respect.

The pipes l0 and H are held in brackets l2 and I4, which are connected to the slides S.

inner end with a plate l5, which may be longi-. tudinally adjusted, by means of threaded members i6 which are connected directly to the end walls of the reduced ends of the cylinder 4. Each reduced end of the cylinder 4 is provided with a nipple i! into which the adjacent end of the pipe in or the pipe ll fits in a liquid-tight manner.

The pipes l0 and H may be made of armored rubber, or other suitable flexible material.

The resilient periphery of the impression cylinder 2 may be of any suitable type, such as one or more blankets, etc.

In Fig. 3, I have shown the paper web W between an internally cooled impression cylinder 4 which has a. resilient rubber sleeve J, and a printing cylinder I. This embodiment is similar to that shown in Figs. 1 and 2, save the jacket J is internally cooled, by contact with the internally cooled cylinder 4, through which water or other cooling medium can be sent.

The embodiment shown in Figs. 1 and 21s preferable to that shown in Fig. 3, because the rubber sleeve is a poor conductor 01 heat, so that the external cooling of said rubber sleeve, shown in Figs. 1 and 2, is superior to the internal cooling shown in Fig. 3.

I have shown a preferred embodiment of my invention but it is clear that numerous changes and omissions can be made without departing from its spirit.

2,078,878 'Each of the pipes l0 and ii is provided at its I claim:

1. In combination, a turnabie form cylinder,

a turnabie impression cylinder having an outer sleeve made of resilient material, a hollow cooling roller turnably mounted in bearings, vertically slidable means adapted to support said bearings, said impression cylinder also having bearings which are vertically movable, said form cylinder contacting with said resilient sleeve along an external portion of said sleeve, said cooling cylinder contacting with said sleeve along another external portion thereof, said cooling cylinder being located above said impression cylinder, and means adapted to cool the internal wall of said cooling cylinder.

2. In combination, a turnabie form cylinder, a turnabie impression cylinder having an outer sleeve made of rubber, vertically movable slides, said impression cylinder having its ends mounted in bearings which are located on said slides, a hollow and turnabie cooling cylinder having its bearings located in said slides, means adapted to cool the internal wall of said cooling cylinder, said cooling cylinder being located above said impression cylinder, said cooling cylinder contacting with an external portion .01 said sleeve, said form cylinder contacting with another external portion of said sleeve.

GUSTAVE A. FRIESS.

Images