US2684117A - Slitter for printing presses - Google Patents

Description

July 20, 1954 J. R. WOOD SLITTER FOR PRINTING PRESSES 2 Sheets-Sheet 1 Filed Sept. 8, 1951 INVENTOR. JvMe-s 9. W000 I! I WM,

. ,4;- mveys J. R. WOOD 2,684,117

SLITTER FOR PRINTING PRESSES July 20, 1954 2 Sheets-$heet 2 Filed Sept. 8, 1951 9 3 a 5 404/ J 0 3? L Ill 22a aam'fi 5;: I flu H' -H I T 3.9 IP 1 I INVENTOR.

Arra 6' Patented July 20,1954

UNITED STATE$ PTENT OFFICE SLITTER FOR PRINTING PRESSES James R. Wood, Cleveland, Ohio, assignor to Harris-Seybold Company, Cleveland, Ohio, a

corporation of Delaware Application September 8, 1951, Serial No. 245,698

7 Claims.

This invention relates to improvements in slitters for printing presses, that is to say devices for slitting a sheet or a web into two or more parts as it travels through a printing press. In order to protect the surface of the cylinder with which the slitting wheel cooperates it is desirable to place a narrow band of thin metal around the cylinder against which the cutting wheel may bear. In the use of the device the rotating cutter gradually a groove in the band, and in order to make a clean cut in the paper sheet or Web despite the slight clearance thus formed the cutter must be advanced slightly toward the band from time to time. If however this adjustment should be carried to the extent that the slitting Wheel should cut entirely through the band it would injure the surface of the cylinder. The present invention is directed to the provision of an adjusting means which may be set at the time the band is placed in position so as to permit the necessary series of adjustments and to prevent adjustment being carried too far;

One of the objects of the invention therefore is the provision of an improved adjusting means for advancing a slitter a small increment at. a time, having provision for preventing further movement after the predetermined extent of adjustment has been attained.

Another object is the provision of means for readily settin the adjusting means and adjustment limiting means when a new band is mounted on the cylinder.

Other objects and features of novelty will appear as I proceed with the description of that embodiment of the invention which, for the purposes of the present application, I have illustrated in the accompanying drawings, in which Fig. 1 is a general side view, partly in section, of the slitter, its mounting and its adjusting means.

Fig. 2 is a plan View of the same.

Fig. 3 is a detail plan View of a band mounting means which may be employed in connection with the invention, the view looking substantially in the direction of arrow 3 of Fig. 1.

Fig. 4 is an elevational view partly in section on the line t i of Fig. 1.

Fig. 5 is a detail view partly in section on the line 5-5 of Fig. 2, showing the adjusting means on a larger scale, and

Fig. 6 is an end view of the adjusting means, showing the gauge wheel for limiting the adjusting movement.

In Fig. 1 of the drawing a printing press cylinder, such as an impression cylinder, is'indicated at it. A thin band I i of steel or other metal surrounds the cylinder. In a gap 12 of the cylinder there is mounted by means of studs M a casting l5 having an inclined projection 53 to which one end of the band H is secured by means of a clamping plate it and machine screws ll. The other end of the band is fastened by means of a clamping plate 58 and machine screws it to a slide 23. A band tightening element 25 with reversely threaded ends and a hexagonal center has its ends threaded into the projection 55 and the slide 29, so that as the element is turned in the proper direction by the application of a wrench to the hexagonal portion thereof the band it is caused to grip the cylinder it firmly. A setscrew 22 threaded laterally into the slide it may be screwed down against the element 2i for lockingit in adjusted position. The casting may be provided with a horn 23 for guiding the band into the gap without sharp turns.

M is a transverse brace rod mounted in the frame of the printing press. A keyway 25 is machined therein. A key 25 is mounted in the Ireyway and held against movement by a screw 2? breaded into the brace rod. A bracket 23 shaped to closely embrace a portion of the rod is mounted on the rod, is held from rotational movement thereon by the key 26 which fits into a transverse slot 29 formed in the bracket, and is held from movement longitudinally of the rod by a setscrew 3i]. The bracket is thus rigidly supported.

The forward end of bracket 28 is bifurcated to receive an upwardly extending arm 3!, these two parts being connected by a pivot 32. At its upper end arm 3? is bifurcated to receive an annular slitter 33 which is mounted by means of a ball bearing on a pivot 34 secured in the bifurcations of the arm, the parts bein so disposed that the slitter is positioned opposite the center line of band ii.

011 the upper arm 33 there is a bifurcated rearward extension which receives and is pivotally connected to a small block 36, the pivot being shown at 37. This block is bored to receive the reduced forward end of an adjusting rod a pin 3Q being driven through registering holes in the block and rod to connect the parts together. Rod 38 extends loosely through a hole in an upwardly extending projection 43 on bracket 58. In front of this projection a washer ii surrounding the rod bears against the projection and forms an abutment for a coil sprin 42 which also surrounds the rod and bears at its front end against a loose collar 33 backed by a nut M on the threaded forward portion of the rod, which nut may be 3 threaded down to the desired extent to compress the spring and which may be held in adjusted position by a lock nut 25.

An adjusting nut st of relatively large diameter is threaded upon the threaded rear end of the rod 38 and has a central boss which bears against the rear face of projection 40. As it is turned clockwise as viewed in the drawings it draws the rod rcarwardly against the force of spring 52 and holds the slitter 33 retracted. When turned a small increment counterclockwise it permits the spring 32 to advance the rod accordingly. The periphery of the nut as is toothed as indicated at i, and these teeth are engaged by a wedge shaped detent 52 which is yieldably forced upward by a spring 53 in the pocket of the bracket in which the detent is slidably mounted. The movement of the nut counterclockwise by the operator a distance of one tooth permits the rod to advance a small increment only, as is necessary at intervals because of the grooving of the band i l by the action of the slitter.

Since the band is quite thin it is desirable that the forward adjustment of the slitter be limited to avoid cutting completely through the band and into the cylinder. For this purpose I provide means for limiting the number of teeth or" the nut which may be advanced rotatably into engagement with the detent 52. This means will now be described. The nut 5i is provided with an integral reaiwardly extending hub 55. Loosely mounted on this hub there is a gauge wheel 55 which has a considerable surface area adapted to engage the rear surface of nut 50, and these surfaces are adapted to be brought into and held in good frictional contact by means of a collar 5? that is threaded onto the extremity of hub 55. When the collar 51 is tightened on the hub, parts and 5e move with the nut as it is turned for adjusting the rod 58. To limit this turning movement gauge wheel 58 may be provided with a cutout 53 in its periphery, the ends of which constitute stops for engagement with the head of a stud screwed into a threaded hole in bracket 28. The peripheries of gauge wheel 56 and collar 5? are preferably knurled for easy operation.

When a new bansL ii is to be installed, collar 5'! is loosene and nut 56 is turned clockwise to retract the arm 3 l. The band is then put in position and tightened. The nut 56 may now be turned coiuiterclockwise to advance the slitter until it touches the in other words until it is positioned to properly sever a sheet of paper. Then the gauge wheel 56 is turned on the hub 55 until the cutout 58 stands in the position of 6, after which the collar 5! is turned down to hold the gauge wheel at tightly against the nut 5% The device is then ready for operation. After a given amount of use the slitter begins to form a groove in the and the cut formed in the paper becomes somewhat ragged, When the operator notes this effect he turns counterclockwise the nut to which the gauge wheel is clamped to advance the nut one tooth. This is repeated from time to time as necessary to maintain a cle n out until the left end of the cutout 53 as viewed in 6 engages the head of stud 59, which prevents further adjustment of the slitter and advises the operator of the fact that the installation or" a new band is necessary.

Having thus described my invention, I claim:

1. Paper slitting means for use in connection with a cylinder of a printing press, comprising a band removably fixed on said cylinder, at fixed rigid bracket, a slitter to slit paper passed between said band and said slitter, means for adjustably positioning said slitter toward or away from said cylinder comprising a rod slidably supported by said bracket, a nut threadably mounted on the rod on the side of said bracket remote from said cylinder, means for biasing said rod towards said cylinder, a gauge wheel concentric with said nut and attached thereto, means for limiting the amount of rotation of said gauge wheel to an angle such that the rod may be advanced a distance less than the thickness of said band, said gauge wheel being angularly adjustable with respect to said nut, and means for locking said nut and wheel together in a selected angular relation.

2. A slitting means as defined in claim 1, wherein said means for limiting the amount of rotation of said gauge wheel comprises a cutout in its periphery, and a stud mounted in said bracket extending into said cutout limiting the movement of said gauge wheel through a dis tance dependent upon the spacing of the ends of said cutout.

3. A slitting means as defined in claim 1, wherein the means removably attaching said gauge wheel to said nut comprises an extended hub of the nut upon which said gauge wheel is loosely mounted, said hub being exteriorly threaded, and a collar threaded on said hub for securing said gauge wheel to the nut in a selected angular relation.

4. Paper slitting means for use in connection with a cylinder of a printing press, comprising a band removably fixed on said cylinder, 3, fixed rigid bracket, an arm pivoted thereto, a slitter mounted in said arm to slit paper passed between said band and said slitter, a threaded rod pivoted to said arm and extending loosely through a hole in said bracket, spring means interposed between said bracket .and said arm tending to advance said slitter toward said cylinder, an adjusting nut threaded on said rod and bearing on the side of said bracket remote from said cylinder, a gauge wheel concentric with and attached to said nut, cooperating stop means carried by said bracket and gauge wheel for limiting the amount of rotation of said wheel and nut to a given angle of predetermined size, which angle limits movement of said slitter to an amount less than the thickness of said band, and means for accomplishing a relative adjustment of said stop means around the axis of said rod to vary the position of the angle through which adjustment of the wheel and nut is possible.

5. Paper slitting means for use in connection with a cylinder of a printing press, comprising a band removably fixed on said cylinder, a fixed rigid bracket, an arm pivoted thereto, a slitter mounted in said arm to slit paper passed between said band and said slitter, a threaded rod pivoted to said arm and extending loosely through a hole in said bracket, spring means interposed between said bracket and said arm tending to advance said slitter toward said cylinder, an adjusting nut threaded on said rod and bearing on the side of said bracket remote from said cylinder, said nut having a rearwardly extending hub, a gauge wheel loosely mounted on said hub, the extremity of the hub being exterior-1y threaded, a clamping collar threaded on said hub for clamping the gauge wheel against the adjusting nut, spaced stops on said wheel and a projection on said bracket adapted for engagement with said stops to limit the extent of movement of the wheel to an angle such that said spring may advance said rod. a distance less than the thickness of said band.

6. Paper slitting means as defined in claim 5, wherein the periphery of said nut is provided with teeth, and a spring detent for engagement with said teeth to hold the nut in selected angular positions as the rod is adjusted forward step by step by said nut and said spring means.

7. Paper slitting means as defined in claim 6, wherein said gauge wheel is provided with a cutout in its periphery, the ends of which constitute said spaced stops adapted to engage said projection on the bracket.

References Cited in the file of this patent UNITED STATES PATENTS Number Name Date Holm a- July 5, 1887 Hoff Sept. 7, 1920 De Pamphilis Oct. 1, 1929 Lefkowitz Nov. 12, 1940 Webster Sept. 17, 1946

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