US1996333A - Paper feed tension mechanism - Google Patents

Description

rApril 2, 1935. A. w. HARRIES PAPER FEED TENSION MECHANISM Filed Deo. 2, 1932 2 Sheets-Sheet l April 2., 1935. A. w. HARRlEs l PAPER FEED TENSION MECHANISM Filed DecQ 2, 1952 2 Sheets-Sheet 2 x'IO w Fig. 4.

NVENTOR ,eZr/'hw WEa/rries BY www, a,

ATTORNE y.;

Patented Apr. 2, 1935V ffy-PAPER FEED,

"' London,l England Arthur william' nii-rits, jrwitkenhsnngana; i i

assigner to Lynton-Broolie-` Company Limited,

This invention relates to tensioningdevices y,for

the feeding of sheets'of 'pap'erfin webform through` printing machines'inwhich the-feed tothe impression cylinder is intermittent, therotaton of y the impression cylinder being'divided into print'- f ing and non-printing `periods andi-the 'feed ofthe paper ceasing during-the non-printing periodi*V According to the present invention two, ormore,

iiexible arms are adapted to bear against the web where it engages a guide roller so as to place a tension during the printing operationen the stretch of paper passing lto the impression cylinder'from the roller, these tension arms being swungr clear of the web at the end lof each printing operation, a second tension :devicecomprising rollers carried on a swinging frame being vadapted to fall onto and to take up the slack inthe'web land place a tension on it during the non-printing In the accompanying l.drawings in 'which similar reference charactersrelate to like parts in all the guresz- Figure 1 is a general view of a rotary printing machine with an intermittent paper rfeed and provided with tension devices constructedaccording to the invention.

Figure 2 is an elevation to a larger scalelof the are a pair of resilient blades 8` and on' one of tension mechanism.

Figure 3 is a plan View of Figure 2.1

Figure 4 an elevation similar to Figure 2 but showing the parts inanother position and Figure 5 a partial sectionl on the line A-B `Figure 4.

The impression cylinder is shown at c, being driven by the intermediate shaft d from the motor e, the paper feed roller shaft at f andthe web of paper fed through the machine at y. Mounted in bearings h on the side frames i of the machine is a guide roller k from which the stretch of paper g passes to the impression'cylinderc and disposed below the. roller lc is a shaft m that is rotatively carried in the frames z' and on which are mounted a pair of iiexible tension arms n. The shaft m is extended at both ends beyond the frames i and on one such extended end is fixed a bar o to which is lconnected the rod p which is actuated by the cam q mounted on the .impression cylinder shaft r. A bar s with an anchoring spring t is fixed to theother extended end of the shaft m.

' The cam lqY is so rshaped and its operation so timed that when the printing operation commences the rod p by the operation of the :cam q and through the link rod or bar o rotates the shaft m so that the arms n are brought up against the stretch of paperfg' "whereit-engagesthe guide roller lcasshown inY Figure 4, the bar s being also swung over and the springt compressed, the stop"ulimiting themovement. Tension is thus placed on the stretch of --paper g during the printing 'operation and at the end-of same the cam q acts.' on the rodp toswingfthe arms n through the; bar! o'- andbyfrotation of the'shaft m back tor theirformerlposition clear of the web as shown-inFigureZ.v t 5 y I' j `iv`rlhe swinging tension frame :v comprises the side bars v that are of curvedr formation as shown andi arev pivotally mounted attheir rear ends on 'the shaftwcarriedinvtheside frames 1 so that the' frame :z: can lswing'freely `up and down, the

upward Amovement'of the frame being elected bythe camV 'j on the shaft f operating the rod .a 'connectedto the rear end 'of one of the side bars v, 'but it falls into itsflowerposition by gravity.

Astation'aryV paperguide roller 2 is fixed on L the side frames i ytowards the rear of the frame and a -frontftension'bar 3, that co-operates with the two bars 4 and 5 mounted in the side bars 'o towards the front of the frame :c to place a tension on the web, is carried by the guide hangers 6 fixed on the sideframes i.' Mounted vonv the rod 'lhrotatably carried in thev side frames i the outerV extended ends'of the rod 1 is iixed aA bar 9-with an anchoring spring vIl! that maintains soV the bar 9 normally against the stop I I and thereby holds the blades 8 in the position Figure 4. e

. At theV end of arms n are swung clear of the web (Figure 2) the tension frame a: falls automatically, the shape and operation of the cam y permitting, into the position shown in this figure whereby the paper web g allowed during the printing operation to sag ,between the rollers k andv2 (Figure 4) shown in the printing operation when the n is drawn taut by the three bars 4, 3, and 5 and the stretch of paper g between the guide roller y' l lc and the impression cylinder c taut during Athe printing operation and to take up the accumulated slack in the web g between this roller 1c and the next guide roller 2 during the non-printing period.

It will be obvious that the tension devices described may also be employed in connection with machines of the platen type where there is an intermittent paper feed. n

What I-claim` 1. In combination, a rotary chine, comprising an impression cylinder, a giiide roller adjacent said cylinder, a second guide roller disposed between said nrst .rollstand the source of Websupply, a tensioning device adapted to engage said"v yebwhere the web engages said rst i roller during the printing period to keep the stretch of web between the iirst roller and said cylinderftaut, fand a second tensioning device adapted to engage said web at al point between said guide rollers during the non-printing period to take up the slack in the streteii of wenbetween said relleis- 2. In eoinbination, a. rotar-Y wel@ printing ina,- enine, eompiising Repression. orlindeiry, a snide roller adiaeent'saideylinder, a seeond guide roller interposed netweenisaid sourde of; web supe ply and the: first rollerl a tensioning device in- @lading a. plurality ofc-,ilegible aims adapted to bear against the webwheraitengages. said roiler to. place a 4tension dining the printing period on the stretch of webpassingfro1n said first roller to, the cillinder, cam opeiated means for Vswingingsaid arms clear of.- tne web at the end of each printing period, a Second tensioning means including aswinging frame and a plurality of bars on said'iraxne adaptedto fallY against said web between said rollers dllliiignthe nim-printing period to place a tension .uponsaid web and thereby take' upv the slack` in saidweli between said rollers, and cani Operated means, for mov-ing said frame and bars ,away from said,- ,webl aty the end of each non-.printing period.v

3'. In combination. a. Wehrprinting'macliine web printing ma-v comprising an impression cylinder, a pair of tensioning devices both located at one side of the impression cylinder, means for moving one of said tensioning devices against the web during the printing period and means for moving the other of said tensioning devices against the web during the non-printing period, the first tensioning device engaging the Web at a `point closer to the impression cylinder than'that at which the second tensioning device engages the web.

4. A tensioning device for the web of paper f ed througha; printing machine comprising web tensioning means, means engaging said web tensioning means for operating said tensioning means onlyat predetermined intervals, a second web tensioning means'engaging said web at a point` different from that at which said rst mentioned tensioning means engages said web, and means foroperating said second web tensioning means only at predetermined intervals not coinaident with. said nist mentioned inten/aia.l

5- Aitensioning device. for the web of paper fed. through. a, piintinginaehine comprising web tensioning.- means, means engaging said. web tensioning means for operating vsaid tensioning means only during the printing. period, a second Web. -tensi@ning means engagingsaid web at. a

Apoint diierent, from that at which said first mentionel tensioning *means*engagesr said web, and means for operating said second tensioning means. only during the non-printing period.

'6, A tensioning device forthe web of paper fed through. a printing machine comprising web tensioning means, means engaging Said web tensioning means for operating said tensioning means only during the printing period, a second tensioning means engaging said web. at. a. point different fiom that at` Which said rst mentioned tensioning means engages said web, and means for operating said second web tensioning means only during the non-,printing period..

ARTHUR WILLIAM I-IARRIES.

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