US3069952A

US3069952A - Cutting machine having rotatable pivotal shearing means

Info

Publication number: US3069952A
Authority: US
Inventors: Roksvaag Lars
Original assignee: Individual
Current assignee: Individual
Priority date: 1957-09-20
Filing date: 1958-09-19
Publication date: 1962-12-25
Anticipated expiration: 1979-12-25
Also published as: GB860962A

Description

Dec. 25, 1962 L. RQKSVAAG 3,0699952 CUTTING MACHINE HAN/NIN@ ROTATABLE PIvoTAL SNEANING MEANS Filed sept. 19, 195s 2 sheets-sheet 1 F'IG.7.

Dec- 25, 1962 L. RoKsvAAG 3,069,952

CUTTINGHMACHINE HAVING ROTATABLE PIVOTAL SHEARING MEANS Filed Sept. 19, 1958 2 Sheets-Sheet 2 FIG. l0.

INVENTOR LARS ROKSVAAG BY /zm, QM www ATTORNEY 3,669,952 CUTTING MACHINE HAVING RGTATABLE PIVTAL SI-MAKING MEANS Lars Rolrsvaag, Norbygaten 44, Oslo, Norway Filed Sept. 19, 1958, Ser. No. '762,166 Claims priority, application Norway Sept. 2i), 1957 1 Claim. (Cl. Sli- 316) The present invention relates to machines for the cutting of blanks, in particular punch cards, by cutting a paper ribbon which is fed from a roll.

Strict requirements are made with regard to the length of such cards and the feeding mechanism and the cutting device therefore must operate in perfect synchronism.

In the machine according to the invention, this problem is solved by feeding the paper ribbon over a rotatable drum on which the cutting knife proper is mounted and partakes in the rotation of the drum. The paper ribbon is kept in pressure engagement with the drum surface by a feeding device preventing any gliding of the paper over the drum surface, to the effect that the paper ribbon and the cutting knife are always moving at the same speed. The knife is pivotably mounted on the drum and co-operates with a stationary control mechanism. A plurality of such cutting knives are arranged circumferentially of the drum, the spacing of the knives corresponding to the length of the cards to be cut.

The invention is illustrated in the enclosed drawing, in which FIGURE 1 is an elevation, partly in section of the machine, and FIGURE 2 a side view corresponding to FIGURE l, but with some details deleted. FIGURE 3 is an elevation of the cutting knife, and FIGURE 4 iS a plan view of the same. FIGURE 5 is a partial sectional view perpendicular to the drum axis. FIGURE 6 is an axial sectional view of the drum. FIGURE 7 is a Vertical section of a guiding member, and FIGURE 8 is a plan view of the same. FIGURE 9 is a fragmentary enlarged view partly in section and partly in elevation of the entire mechanism. FIGURE 10 is an enlarged fragmentary plan View showing one of the cutting knives and its supporting means.

rl`he machine comprises a drum 1 having a shaft 34 which is rotatably mounted in bearings 2 in a frame 3, the shaft 34 being rotated by any conventional drive means not shown. Above the drum 1 a feeding device is mounted in a casing 4 positioned at a certain distance from the circumference of the drum and mounted in a frame 5. In the casing d pressure rollers 6 are mounted and are urged against the paper ribbon 7 by spring means, not shown. The rollers 6 are adapted to perform a restricted movement only, an abutment being arranged for the purpose of preventing the rollers from engaging the drum proper when the drum is running without paper ribbon. The paper ribbon 7 is fed from a roll, not shown, and, when the machine is to be started, the leading end of the ribbon is inserted between the drum 1 and the rollers 6. On the passage from the feed roll to the pressure rollers, the paper ribbon may be provided with printed matter by means of conventional printing rollers engaging the drum.

Spaced along the circumference of the drum 1, at one end face of the same a plurality of knives 3 are pivotably mounted, such knives performing a swinging movement in dependence on the rotation of the drum. As shown in FIGURES 3 and 4, each knife is pivoted on a stationary counter-knife or fixed blade 9 on a pivot 1i) and is maintained in resilient engagement with the counterknife by means of a screw'spring, not shown, located inside a nut 11 which is screwed on to a screw threaded end portion of the pivot 1t). The counterknife is provided with holes 12 adapted to receive screws 12 for securing the counter-knife to the drum 1 structure.

The cutting knife 8 is at the end opposite to the cutting blade and outside the pivot 10 provided with a forked extension 13 which is provided with holes 35 for the pivot 35 of a rod 14 which at its opposite end, is connected to a slide 1S. The slide 15 is provided with a pin 16 which is in engagement with a. cam groove 17 disposed eccentrically to the drum axis 34 and formed in a stationary disc 18 so that when, during the rotation of the drum, the pin moves through the curved cam groove 17, the slide is moved radially inwardly and outwardly on the drum, this motion being transmitted to the knife `8 through the rod 14 and the crank arm or extension 13. 'Ihe engagement of the pin 16 in the groove 17 preferably is p erformed through a rolle-r 36 arranged at the end of the pin for the purpose of reducing friction and wear. Due to the fact that the pin 16 is guided in a groove and does not rest on the circumference of a disc, the movement of the knife is independent of the centrifugal force.

In order that the knife may cut the paper ribbon completely, grooves must be provided in the drum surface adapted to receive the knife edge during the nal portion of the knife movement, but in consideration of the printing possibly to be effected on the paper by means of a printing roller, and because of the pressure rollers, such groove must be closed when the knife is in raised position. This is effected by means `of a filler member which is shown in FIGS. 5 and 6, of which FIG. 5 is a partial sectional view perpendicular to the drum axis and FIG. 6 is an axial sectional view of the ller member and the device operating the same.

In FIG. 5, 19 is a groove provided in the drum surface. The drawing also shows the position of the knife 8 adopted upon completed cutting movement. As is shown in FIGURES 5, 9 and 10, the stationary knife blade 9 extends completely through the groove 19 which is axially coextensive with the drum. The ends of the blade 9 respectively are anchored by bolts 12 to the

structural members

29 and 31 at opposite ends of the drum for rotation with the drum. Due to their operative association with the drum, these

members

29 and 31 may be regarded as part of the drum structure. The filler member is shown at 20 and consists in a sheet having overtu rned end edges or guiding means 21 which each engages a groove 22 to either side of the drum. The member 20 may be moved radially up and down along the grooves 22 by means of a rod Z3 which is connected to the member through rigid links 24 which make the member 20 perform a reciprocal movement in radial direction by movement of the rod in axial direction. The rod 23 is guided in openings 25 through

members

29 and 31 at either end of the drum and is at its left hand end as shown in FIGURES 1 and 6, which projects beyond the end face of the drum, provided with a roller 26 which is under influence of a stationary cam 27 which extends for a short distance along the end face of the drum. When, as shown in FIGURE 6, the roller 26 engages the cam surface 27, the rod 23 is moved to the left in the drawing and the filler member 20 is pulled radially into the groove 19, and when the rollerl has passed the cam 27, the rod is moved to the right by a spring ZLS so as to return the member Ztl to its outward position.

The said guiding means 21 and 25 of the ller member Z0 and the rod 23 respectively, are arranged in the

members

29, 30 secured to either end of the drum. The member 30 shown in FIGS. 7 and 8 in a vertical section and in a plan View, respectively also serves as a guide to the slide 15 pivoting the cutting knife 8. The member 30 consists of a part with U-shaped section, through the transverse portion 31 of which the member is secured to the end surface of the drum. The part 31 also is provided with a groove 22 for guiding the overturned end 21 of the ller member 20 and also with the guide opening 25 for the rod 23. The legs of the guide member also are provided with ribs 32 providing guide faces to the slide 15v which is provided with corresponding grooves in both side faces. The member 29 at the opposite end of the drum is not equipped with any knife control means and consequently merely consists of a plateformed member similar to the transverse portion 31 of the member 30. The

members

29, 30 also serve to secure the counter knife 9, as they are each provided with a screw threaded hole 33 adapted to receive the screws 12 passing through the holes 12' of the counter knife 9. When the knives 9 are mounted in the manner indicated, the drum surface may be so ground that the counterknife is in perfect alignment with the cylindrical drum surface.

The cutting action is effected shortly after each knife has passed the feeding device 4, and the card severed which has a tendency to adhere to the drum surface is pushed olf by a pin, not shown, which is supported in the drum wall and iniluenced by a stationary cam face.

I claim:

Machine for cutting blanks from a continuously advanced ribbon comprising, in combination, a rotatable drum over which said ribbon is passed, said drum having a recess in its circumferential surface and extending parallel to the rotational axis of said drum from one edge of said surface to the other edge thereof, a fixed blade mounted in said recess and flush with said surface,

said blade extending parallel to said axis and outwardly d l ing an extension projecting beyond said pivot, a stationary cam member disposed outwardly of said knife extension and having a cam groove in its inwardly facing surface, means connected to said knife extension and engaging in said cam groove for producing pivotal movement of said knife into and out of said recess as said drum rotates, a ller member mounted in said recess beside said fixed blade for movement between an outer position flush with said surface and an inner position permitting said knife to enter said recess, and means for moving said ller member and comprising a rod mounted in said drum for movement parallel to said axis, said rod extending beyond said other edge, a cam follower on said rod beyond said other edge, a fixed cam engageable by said cam follower, means connecting said rod and said ller member to move the latter inwardly when said cam follower engages said cam, said cam being positioned t-o engage said cam follower when said knife is about to move toward said recess, and means to move said ller member outwardly when said cam follower leaves said cam.

References Qited in the le of this patent UNITED STATES PATENTS Laukhui Nov. 12, 1912 Bacon Sept. 27, 1887 Gates Feb. 23, 1904 Macfarren July 3, 1934 Hale Aug. 6, 1935 Regalia June 16, 1953 FOREGN PATENTS 457,946 Great Britain Dec. 9, 1936