US2011505A - Paper cutting and delivery mechanism for web cylinder lithographing or printing presses - Google Patents

Description

Aug. 13, 1935. w H sMlTH 2,011,505

` PAPER CUTTING AND DELIVERY MECHANISM FOR WEB CYLINDER LITHOGRAPHING OR PRINTING PRESSES Filed Sept. 16, 1933 5 Sheets-Sheet 1 Aug. 13, 1935. W. H. SMITH 2,011,505

PAPER CUTTING AND DELIVERY MECHANISM FOR WEB CYLINDER LITHOGRAPHING OR PRINTING PRESSES 5 Sheets-Sheet 2 Filed Sept. 16, 1933 R m I Aug. 13, 1935.

H. SMITH 2,011,505

W. PAPER CUTTING AND lDELIVERY MECHANISM FOR WEB CYLINDERLITHOGRAPHING OR PRINTING PRESSES Filed Sept. 16, 1935 5 Sheets-Sheet 5` /Nl//VTR.

M/TH.

7' TORNEYJ.

Patented Aug. 13,1935

UNITED STATES PATE NT OFFICE f PAPER CUTTING AND DELIVERY MECHA- NISM FOR WEB CYLINDER LITHOGRAPH- ING R PRINTINGPRESSES walter nai-pia smith, Taranto, ontario, canada Application september 1e, 193s, serial Np. esimo s claims. (o1. 164-68) My invention relates to improvements in paper cutting and delivery mechanism for web cylinder lithographing or printing presses, and the object of the invention is to devise a, device by which paper web of any desired weight may be cut at great speed and controlled after cutting so that a perfect vertical pile may be formed of the severed sheets without adjustment being necessary on account of the varying weight or thickness ofthe stack being printed and cut, in which the web is fed to the knife by changing the normal path of the web. and compelling it to assume a direction oftravel in a straight line contrary to its normalvcurve, in which the cutter may be adjusted while the machine is running either to advance or retard the cut -while the machine is in motion to vary the cut with relation to the print, in which means are provided for accelerating the travel of the severed sheet to advance it in relation to the advancing web to move it out of the path of such web before the next sheet is severed, and in-which means are provided for preventing the web following the rotary cutter owing to the upward displacement of air caused by the high speed of the revolving rotary cutter orowing sometimes to static electricitywhich is frequently present in 'printing presses and preventing the proper delivery of the cut sheet, and it consists'essentially of the arrangement and construction of parts as hereinafter more particularly explained.

Fig. 1 is a plan view of my cutting and delivery mechanism carried by the rear end of the main frame of the press. e e l Fig. 2 is a side elevationv of the mechanism illustrated in Fig. 1. j

Fig. 3 is a sectional vlew'on line `3--3 Fig. 1.

Fig. 4 is a detail elevation of a portion of the opposite side of the machine shown inFlg. 2.

Fig, `5 is a sectional view. through the rotary cutter and adjacent partsl and showing the compressed air discharge nozzle inthe cutter.

g. 6 is a front elevation of a portion of the rotary cutter, the upper portion of part thereof being in section.

Fig. 7 is a sectionalview on line 'l-lof Fig. 6.

Fig. 8 is a front elevation of the parts illus# trated in Fig. 6. v

In the drawings like letters of reference indicate corresponding parts in each figure. v

I and 2 are the side po ions of the main frame of the cylinder press, each portion I and 2-cara rying a bearing standard 3 in which are jour'- nalled Athe conveyor roller 4 and conveyor wheel shaft 5 carrying the conveyor. wheels 5x, the shaft in the standards movable bearing blocks 8 held 3 so that they are carried by gravity onto the web l as it passes over the conveyor roller 4. 8 are standards in which is jour` shaft 9 upon which the rotary cutter l0 is mounted to revolve therewith. 'I'he cutter shaft 9 ,is driven from any suitable power, not shown.

10 is a stationary ledger blade mounted between theside members l and 2 so asi to coact with the knife Il)x of the rotary cutter Ill. Il is a plate which extends between the periphery of theconveyor roller 4 and the cutting edge of the ledger blade |00, the opposite edge of the plate II being veryy closely adjacent to the periphery of the conveyor roller l being slightly up-turned at the periphery of the roller as shown so as to strip ofi the web therefrom as it travelsv forward. The plate Il ,is suitably mounted in a stationary position such as upon the cross rod l2 by the brackets i3.' g

i4 is a feed roller which is the bearing ystandards by` the upper surface such web as it passes around the conveyor roller 4 opposite the point where the plate Il strips the web4 from the roller I and thereby aids in performing such stripping operation and forcing the paper web out of its normal path of travel onto the surface of the plate Ii so that, as it travels thereover, it will have a tendency to cling to such surface and hold the paper or other material absolutely i'lat as it travels to the cutting point so that the length of paper fed to the cutter after each cutting operation will be exactly the same and will have no tendency to be slightly altered by any looseness in the set of the paper during this part of the conveying operation.

It will thus be seen that by changing the normal path of the web and compelling it to assume a path of travel in a straight line :contrary to its normal 'curve and as it travels in its normal path, isdeilnitely forced onward by the roller l and wheels I and will cling to the surface of the plate -Ii in -a straight .line the edge of the blade of the rotary cutter engages therewith. The curved edge Il` of the plate Il engages the roller l and strips the web therefrom, thel rotationof the roller 4 forcing the web forward and into contact with the plate i I as the web passes over the upper surface thereof. i The engagement of the blade with thepaper will serve to momentarily stop the forward'travel of the paper web at that point and, as the feed being mounted in of the web is driven by plugged end of .to carry the sheets 2 of the roller 4 is continuous, there will be a slight tendency for the paper to buckle upward, the amount of buckle depending upon the weight of the paper fed -to the cutting blade. If the paper is very light such as an onion skin paper, there will be only a tendency to buckle slightly adjacent to the blade of the rotary cutter and as the weight of the paper used increases the extent of the buckling will increase rearwardly so that in stii paper or card board the buckle will take somewhat the form illustrated by dotted lines A in Fig. 3.

After the sheet is severed each sheet must be individually conveyed away from the cutting point to the point of deposit and for this purpose I provide an endless conveyor I5 mounted, at one end, upon a driven drum shaft I5 provided, at its end, with a small pulley I1 driven from the pulley I8 secured to the conveyor roller 4 through the belt I9 connecting the pulleys I1 and I8 together. By this means the conveyor I5 will be driven at a very much accelerated speed to the speed of the conveyor roller 4 and will, therefore, serve when cut rearwardly at a very much higher speed than the speed of travel of the web 1.

In order to counteract upward lift upon the stack as it advances past the rear side of the rotary cutter, I provide a duct 91 extending through the shaft 9 leading, at its inner end, into a cylindrical chamber 9 from which extends tangential discharge nozzles 91 which discharge compressed air at the rear of the cutting blade IIIX. The discharge is timed by a timing valve which I will now describe.

The outer end of the shaft 9 is plugged as indicated at 58 (see Fig. 6). 59 is a compressed air inlet formed in a bearing 69 in which the the shaft 9 is journalled. 6I is a cut-OIT chamber communicating on one side with the bore of ,the journal 60 and onthe other side with the inlet 59. The duct9x is provided with a port 62 which registers with the open side of the cut-olf chamber 6I during approximately 80 of the revolution ofthe shaft so as to feed compressed air to the nozzles 91 to direct it against the web as the nozzles pass from the dotted line position to the full line position shown in Fig. 5 forcing the paper web downward towards the dotted position shown in this figure carrying it out of the inuence of the upward pull of the revolving cutter until acted upon by the compressed air jets of the pipe 20. By this means it will be seen that a blow is directed in a given path at a predetermined time to blow the sheet forcibly away from the cutter and onto the accelerated travelling delivering means.

In order to ensure that the sheets, immediately after they are cut, engage at their leadingedge with thesurface ,of the conveyor I5, I provide a transverse air pipe v20 which is suitably perforated to provide a series of air jets as indicated at 2| which blow upon the upper face of the cut sheet so as to immediately force it into close-frictional contact with the surface of the conveyor I5 so that it immediately engages therewith and is carried rapidly rearward. As the cut sheet is carried rearward by the conveyor I5, it is engaged by the idler discs 22 which are mounted in arms 23 carried by a cross rod 24 mounted in standard brackets 25 forming part of main brackets 26 extending rearward from the side portions I and 2 of the frame of the press.

21 and 28 are the side walls of a sheet re- I ward as the` pile The side walls 21 and ceivingk receptacle, 29 being the bottom which is adjustably mounted as indicated at 39, mechanism being provided to convey the bottom downof paper sheets build-up within the receptacle. This mechanism is not shown as it forms no part of the present invention. 28 are supported in any suitable manner such as by the hangers 3I carried by a cross rod 32 mounted in the brackets 26.

33 are vertical bars secured to a cross bar 34, bar' projecting upward adjacent the periphery of the forward roller I6l of the conveyor I5 at a height to permit the free passage of the cut sheet thereover. At the opposite or rear side of the sheets receiver, I provide depending bars 35-preferably mounted at their l upper end on a rod 36 mounted, at its ends, in the brackets 26, such bars extending above the path of travel of the cut sheet. When the cut sheet is impelled forward at a high rate of speed it passes into the sheet receiver striking the bars 35 at its forward edge and has then a tendency to rebound back so as not to properly enter the re-v ceiver. In order to obviate this, I provide aseries of fingers 31 mounted, at their rear end, lin a rocking shaft 38 which is mounted in the brackets 26 and provided, at its ends, with arms 39 and 48, the arm 39 being connected by a link 4I to a leverl 42 pivotally mounted at 43 and carrying a cam roller 44 journalled thereon.

45 is a cam which is secured to the end of the cuttershaft 9 so as to revolve therewith, the arm 42 being vspring held rearwardly by the spring 46. It will thus be seen that as the cutter shaft 9 re volves to.- rotate the cutterit also,,by means of- 31 alternately up and down, to and from the dotted position illustrated in Fig. 3 so that as each sheet is fed into the receiver and engages the bars 35, the fingers against such sheet knocking it directly downward onto thetop of the pile, any tendency to rebound being then taken by the bars 33 thereby holding each sheet definitely in position to form a perfectly vertical pile.

Inorder to advance or retard the cutting edge of the knive IIIx which is driven from the conveyor roller 4 through the gears 41, 48, 49 and 59, the gear 41 is secured to the feed roller 4 and the gear 50 to the cutter shaft 9. The gears 48 and 49 are idlers intermeshingtogether and with the gears 41 and 59. The idler gears '48 and 49 are mounted on studs 48x and 49* mounted in a link 5I. 52 isa link connecting the stud 49x with the cutter shaft 9. 53 is an arm secured to the stud end 4x of the feed roller 4 and through the opposite end of which the stud 4I!x extends. 54 is a worm quadrant formed integral with the arm 53 and 55 is a worm meshing therewith and secured to a spindle 56 journalled in s -table bearings and operated by a hand wheel 51.`

By rotating the hand wheel the parts may be adjusted to and from a dotted position such as that indicated in the drawings to adjust the cutting edge of the cutting knife circumferentially to advance or retard the cut at any time during the operation of the machine. l

From this description it will be seen that I have devised a machine by which webs of varying thickness one with the other may be accurately fed to the cutter. soK that each sheet is cut exactly the same length and when cut conveyed to the sheet receiver and received 'so that the rebound of the sheet discharged at high speed against each sheet being carried vertically do-wnward at the point of rebound onto the top of the vertical pile .instead of being carried back by such rebound to engage the next delivered sheet and consequently ensuring of the building of a pile, the opposite walls of which are parallel and preferably vertical without interference with the sheets pass-- .ing from the point of discharge.

What I claim as my invention is:

1. In a cutting and delivery mechanism for a cylinder press, the combination with the rotary cutter and the feed roller, of gears secured to the cutter and feed roller shafts, intermeshing idler gears meshing with the gears of the cutter and feed roller, a link connection swung upon the cutter and feed roller shafts on which the idlers are mounted, and a manually operable worm gear for adjusting the position of the links around the cutter and feed roller shafts.

2. In'a cutting and delivery mechanism for cylinder presses, the combination with a conveyor roller over which the paper web is fed to pass downward, of a substantially horizontal plate extending from the periphery of the roller` adjacent its horizontal diameter, and an idler roller contacting with the web and spaced from the conveyor roller and plate a distance sufficient to hold the web closely adjacent to both roller .and plate. x

3. In a cutting and delivery mechanism for cylinder presses, the combination with a revolving cutter, means for feeding a freshly printed web in a horizontal direction towards the cutter, a sheet receiver, means for engaging the imprinted face of the web for conveying each sheet from the cutting point to the receiver at an accelerated speed.' and means opposing and having no mechanical Contact with the freshly printed face of the web for pressing the web into contact with thev conveying means.

4. A device for severing a freshly printed web vinto sheets comprising in combination a stationary blade over which the sheet passes printed side up, a revolving cutter coacting with the stationary blade to sever the sheet and force the cut edge of the severed sheet down and away from the stationary blade positively and out of the path of the on-coming cut end of the travelling web and a travelling conveyor travelling at a greater speed than the web and on which the sheet is carried,

and means for pneumatically holding the sheets in contact with the conveyor.

5. In a cutting and delivery mechanism for cylinder presses.l the combination with a rotary cutter and feed roller shafts, intermeshing idler gears meshing with the gears of the cutter and feed roller, a link connection swung upon the cutter and feed roller shafts on which the idlers are mounted, and manually controlled means for adjusting the position of the links around the cutter and feed roller shafts.`

6. In a cutting and delivery mechanism for cylinder presses, the combination with a web feeding mechanism, of a rotary cutter coacting with the feeding mechanism to cut the web into sheets, a compressed air duct leading axially through the body of 'the cutter, nozzles leading tangentially from the duct to the periphery of the cutter, and means for supplying air to the duct and nozzles after the cutting of each sheet and during the upward travel only of the cutter.

7. In a cutting and delivery mechanism for cylinder presses, the combination with the press and a rotatable cutter to which the printed web is fed printed side up, of a high speed horizontal conveyor spaced below the cutting level and onto which the sheets as they are cut are dropped successively, and means having no mechanical Contact with the freshly printed face of the sheet for pressing the opposite or unprinted face of the sheets into contact with the conveying means.

8. In a cutting and delivery mechanism for cylinder presses, the combination with a conveyor i roll over which the web is adaptedto travel longitudinally, of a rotary cutter located above the path'of travel of the web and coacting with the ledger blade to cut the web into sheets, and means incorporated in the structure of the cutter for directing compressed air against the severed sheet adjacent its following edge as such edge passes adjacent the rear of the cutter.

WALTER HAROLD SMITH.

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