US2450312A - Web cutting mechanism - Google Patents

Description

Sept. 28, 1948. P. l.. ToLLlSoN WEB CUTTING MEcHANrsM Filed March 9, 194e N y &9 mw ...mu

A wm N KN n 1 1 1 IL. L l, u N m /J Vi ww h bw mw, NQS S MY l u v A v u v v v v l Y K A u v v v f S me Patented Sept. 28, 1948 WEB CUTTING MECHANISM Paul L. Tollison,

to Wood Newspaper Machinery North Plainfield, N. J., assigner Corporation,

Plainfield, N. Si., a corporation of Virginia Appiication March 9, 1946, Serial No. 653,401

4 Claims.

This invention relates to printing presses, particularly to folding and severing mechanism associated therewith especially in newspaper plants.

For many years it has been accepted as inevitable that a press room be extremely noisy during operation of the presses. It is now recognized that a high noise level is productive of unnecessary fatigue and possible impairment of hearing in those who must work under it. It is therefore a principal object of this invention to reduce press room noise level.

I have found that one of the principal sources of noise in a. high speed press installation of the type usually found in newspaper plants is the normal operation of the knife box cheek woods. This noise derives from two phases of the cheek wood operation. The first and least objectionable is caused by the cheek wood striking the unsevered web of paper as rotation of the cutting cylinder causes the knife box to approach the folding cylinder. The other and most bothersome noise arises from the impact of the cheek woods with their stops in their outward travel along the knife blade after the severance of the paper. Accordingly, the particular objects of this invention are to provide an improved construction for the cheek pieces of the knife box that will avoid this principal source of noise and will, at the same time,

be adapted for use in existing knife boxes as a repair orfreplacement for existing cheek Woods, without making any substantial alterations.

An embodiment of my invention is described in connection with the appended drawings, in which:

Fig. 1 is a partial cross-section through the cutting cylinder II and folding cylinder Ii! of the cutting couple of a high speed rotary press, taken at the moment of cutting action and illustrating an embodiment of my invention; and

Fig. 2 is a longitudinal section taken on the line -5 of Fig. 1.

As shown in Fig. 1, the severance of the paper I3 is accomplished by drawing it between the cutting cylinder II and the folding cylinder Ill of a cutting couple- The folding cylinder I0 is provided with one or more cutting rubbers I4 spaced to cooperate with a knife or knives I5 held in one or more knife boxes I2 on the cutting cylinder II. To free the severed web I3 effectively from the knife I5, it has been well known for many years to provide the knife with extensible cheek pieces which move outward along the knife towards its cutting edge as the knife and cutting rubbers draw apart, thereby to push the web clear of the blade.

In the disclosed embodiment of my invention, these cheek pieces are represented by the cheek 4woods I6 on either side of the blade I5. These cheek woods are pressed outward from the axis of the cylinder Il toward the serrated cutting edge of the blade I5 by the post carried springs I?, but are retained within the knife box I2' by the stop shoulders I8.

The cheek woods I6 are provided at each end with a dash pot control device which checks their' return against the stop shoulders I8 under the influence of springs I'I. This dash pot device, as illustrated in Figs. 1 and 2, comprises a connecting rod 23 which at one end is pivotally connected to the cheek Wood I6 by the pin 24 and at its other end carries a piston 25 slidable in a check cylinder 26. This cylinder is full of fluid, preferably of the sort used in hydraulic shock absorbers, and is closed at its inner end by the plug 21. It is further provided with a system of passages connecting the spaces in the cylinder 26 above and below the stroke of the piston 25.

Passage 28 which opens into cylinder 26 a short distance above the bottom of the stroke of piston 25 is connne'cted through the passage 29 to the passage 3l! which opens into cylinder 26 above the piston 25 when the cheek wood I6 begins its outward motion under the influence of the springs I'I. Fluid flows rapidly through passage 28 which is of comparatively large diameter and thence through passages 29 and 30 also of comparatively large diameter from the bottom of the piston 255 to its top. Thus the initial outward motion of the piston 25 is scarcely checked at all by hydraulic action. However, as the cheek wood I6 nears its full extension, but before it comes in contact with the stop shoulder I8, the piston 25 closes off the opening of the passage 28 into the cylinder 26 and fluid trapped under the piston 25 must ow through the relatively restricted passage 3l into passages 29 and 30 in order to reach the space at the top of the piston 25. Thus the rapid outward motion of the cheek wood I6 is checked and becomes an easing into Contact with the shoulder stop I8.

In order to permit the easy inward movement of the cheek wood I6 as it comes in contact with the unsevered web I3 at the next cutting operation, the relatively large passages 32 and 33 are provided at the bottom and top of the stroke of piston 25. VThese passages 32 and 33 are interconnected through the `bal-l check valve 34 which permits passage of fluid through it only from the top of the piston 25 to the bottom.

I have described this invention in connection with an embodiment directly applicable to existing machinery. I do not wish to be limited to the details thereof but instead by the scope of the appended claims.

I claim:

1. In the cutting couple of a printing press, a. knife box, a knife therein, cheek woods on either sideof said knife, said cheek woods being movable Vparallel to said knife and'perpendicular to its cutting edge, cylinders carried by said knife box, pistons running in said cylinders and., connected to said cheek woods, the travel of said. pistons in said cylinders being limited and thereby limiting the outward travel of saidcheek-woods# so that the outer surfacesV thereofdo not;pass: beyond said cutting edge, passages v,connecting the:

inner and outer portions of said cylinders lying on opposite sides of said pistons and 4fluid in said cylinders.

2. The combination Vof claim l in which the passages connecting, the inner and outer portions of each of saidf cylinders comprise .two .relatively largeiorices into the inner portion of the cylinder, two orificesl into the outer portion of the oylinder one. relatively,I large and one relatively small, apassageconnecting oneofsaid inner and the4 larger of said' outer Vorifices, a ball check valve in said passage permitting loutward ilow 'onlyfana'dditional relatively-large orifice intermediate saridfinner andsaid outer orices but so locatedas to be,outward of. the outer surface of said piston except during. thenal portions of its outward travel, anda second passage inter'- connecting. .the other" of saidinner,` the smaller of saidouterr and said additional orices.

3. In the cutting couple of a printing press, a knife box, a knife in said knife box, cheek pieces on either side of said knife movable parallel to said knife and perpendicular to its cutting edge, springs for moving said cheek pieces outwardly relative to the cutting edge of said knife and a dashpot connected between said cheek pieces and said knife box for cushioningthe outward movement of said cheek pieces.

4. In the cutting couple of a printing press, a knife box, a knife in said knife box, cheek pieces on either side of said knife movable parallel to said knife and perpendicular to its cutting edge,

springs for moving said cheek pieces outwardly relative to the cutting edge of said knife, cylinders carried by said-knife box, pistons running in said cylinders and connected to said cheek pieces, fluid in said cylinders and means forming restricted uid passages between the portions of said cylinders lying on opposite sides of said pistons whereby the outward movement of. said pistons andthe connectedzcheek vpieces is cushioned.-`

PAUL L. TOLLISON..

REFERENCES CITED The following references are of recordlin the file of this patent:

UNITED STATES PATENTS Number Name Date 419,835 Crowell Jan-21, 1890 422,576 Eager March4,-1'890 586,327 Agnew July 13, 1897 2,038,333 Bachmann Apr, 21, 1936

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