US2360653A - Adjustable slitter for printing presses and the like - Google Patents

Description

Oct. 17, 1944. J DAVlDSON 2,360,653

ADJUSTABLE SLITTER FOR PRINTING. PRESSES AND THE LIKE Filed Feb. 28, 1941 A INVENTOR JOHN A. DA V/DSO/V BY am I ATTORNEY Patented Oct. 17, 1944 ADJUSTABLE SLITTER FOR PRINTING PRESSES THE LIKE John A. Davidson, Brooklyn, N. Y.

Application February 28, 1941, Serial No. 381,187

2 Claims.

This invention relates to slitters and perforators particularly adapted for use on printing 7 presses of the off-set type and the like.

When sheets are being printed on presses of the indicated type, it is preferred to slit or perforate said sheets as they pass over the impression cylinder. In accomplishing this operation, reat care must be exercised not to injure the cylinder by scoring or in any other manner. Also great difiiculty is encountered in positioning the slitter or perforator with respect to the printed sheet and this difiiculty is magnified when several such devices are simultaneously employed.

The invention, therefore, has for its primary object the provision of a slitter or perforator which can be micrometrically positioned so as to slit or perforate accurately along the line desired and with an exact degree of pressure whereby proper slittin or perforating is had without danger to the impression cylinder. Another object of the invention is to provide a slitting or perforating device which may be roughly positioned with respect to the impression cylinder of a press and then micrometrically and accurately adjusted to operate along a designated line and at a proper pressure.

The invention is further characterized by the simplicity of its structure, the ease with which it may be applied to a press, and assurance that, once set, it will maintain its position until readjusted.

With the foregoing and many other objects, features, and advantages in mind reference is now made to the accompanying drawing in which a preferred embodiment of the invention is illus trated, the following specification being based thereon.

In the drawing:

Fig. 1 is a plan view of a slitter or perforator incorporating the features of the invention, and shown partly in cross-section;

Fig. 2 is a side view thereof; and

Fig. 3 is a fragmentary detail sectional view as taken on the line 3-3 of Fig. 2.

Presses of the indicated type are provided with a member 5 in the form of a rod or tub which is positioned in spaced relation to the impression cylinder shown at 6.

The slitting or perforating device, as at present contemplated, comprises a housing 1 arranged to be clamped on the bar 5 as by means of the clamp member 8 pivotally connected to said housing at 9 and locked by the screw or bolt means ID.

The housing 1 is preferably formed with a slideway H for a cutter holding unit l2 which is longitudinally movable therethrough. The cutter holding unit may comprise the slide 13 at one end of which is rotatably mounted a cutter M which may be a slitter orperforator, and which is provided atthe other end with a threaded stud I5. The latter portion preferably protrudes through an opening l6 formed ina wall ll of the housing 1. A compressionspring H3 or other suitable means may be arranged around the stud l5 and confined between the wall I! and the slide l3 to urge the cutter holding unit in a direction towards the impression cylinder 6.

In order to control the longitudinal position of the cutter holding unit and for accurately locating the edge of the cutter M with respect to the surface of the impression cylinder, an adjusting nut I9 is provided. This nut is preferably made in the form of a hand manipulatable member having a threaded seat 20 for the stud I5 and held by the spring I 8 against the housing wall H. In order to obviate creeping of the nut I9 and to provide a means for determining the end-wise adjusting movement of the cutter holding unit, a detent 2| having successive en agement with a plurality of circumferentially arranged depressions 22, which are formed in the housing wall [1 is provided.

It may be seen from the foregoing that the edge of the cutter may be accurately positioned with respect to the impression cylinder to give a desired degree of cutting pressure, and that, knowing the pitch of the screw thread on the stud l5, and counting the clicks of the detent, the forward or retracting movement of the cutter may be accurately ascertained so that the adjusted position of the cutter may be known. If desired, a scale may be provided to disclose both the movement of the cutter with respect to the housing or of the impression cylinder and the rotational movement of the nut l9. Thus, in the manner of a micrometer, an accurate reading of the cutter position with respect to the surface of the impression cylinder may be had. 7

The device is also provided with means for adjusting the cutter to a desired position along the length of the impression cylinder. For this purpose there is preferably provided a rack 23, which by means of clamps 24 may be secured to the bar 5. The rack, in this manner may be roughly positioned.

The housing I is provided with a Worm 25 or other suitable member having engagement with the rack 23, said worm being disposed in a bore 26 in said housing and said rack being preferably relatively movable in a passage 21 formed therein. The worm 25 may be provided with extensions having bearing in the housing, and one or both of said extensions may be further extended as at 28 and formed for cooperative engagement with an adjusting tool for rotating said Worm.

In order to accurately locate the cutter along the impression cylinder, the clamp 8 is eased by loosening the screw or bolt means ID to free the slide housing for longitudinal movement along the tube 5. A suitable tool is then applied to the extension 28 to rotate the worm 25 which, because of its engagement with the rack 23, causes traverse of the housing I along the bar 5. When the cutter M is accurately positioned along a desired point of the impression cylinder, the clamp 8 is tightened and the tool removed.

From the foregoing it is evident that a simple and highly efficient device has been provided for universal adjustment of a slitting, piercing or perforating cutter. However, the principle of the inventionas herein disclosed may be incorporated in structures varying in arrangement and proportion from the illustrated form of the invention Without departing from the spirit and scope of the invention as hereinafter claimed.

Having thus described my invention what I claim as new, and desire to secure by Letters Patent, is:

l. A device of the character described comprising a housing having a slideway and a. plurality of circumferentially-arranged depressions, a member adapted for movement in said slideway, a cut ter on said member, means engaged between said housing and said member for urging said cutter in a direction away from said housing, screw means, manually operable means attached to said screw means for drawing said member and said cutter towards said housing, and means associated with said manually-operable means adapted for successive engagement with said depressions.

2. A device of the character described comprising a housing having a slideway and a plurality of circumferentially-arranged depressions, a member adapted for movement in said slideway, a cutter on said member, means engaged between said housing and said member for urging said cutter in a direction away from said housing, screw means, manually operable means attached to said screw means for dramng said member and said cutter towards said housing, said screw means comprising a threaded stud carried by said memher, a nut engaged with said stud and detent means between said nut and said housing adapted for successive engagement with said depressions for maintaining said nut in adjusted position.

JOHN A. DAVIDSON.

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