US1962761A - Feeding and cutting mechanism - Google Patents

Description

June 12, 1934. 5. J. CAMPBELL FEEDING AND CUTTING MECHANISM Original Filed March 24, 1928 gwuentov Patented June 12, 1934 UNITED STATES FEEDING AND CUTTING MECHANISM Samuel J. Campbell, Green Bay, Wis.

Original application March 24, 1928, Serial No. 264,410, new Patent 1,878,437. Divided and this application May 26,

1 Claim.

This invention relates to improvements in feeding and cutting mechanism. The present application is a division of my co-pending application No. 264,410 filed March 24, 1928 and relating to 5 a napkin folder in which the feeding and cutting mechanism of the present invention is shown.

It is the object of the present invention to improve the facility with which paper webs may be severed, regardless of the type of paper in the web.

It is a further important object of the invention to provide an arrangement in which the rate of feed of the paper Web may be varied within limits by changing the rate of operation of the feed roll without changing the rate of operation of the cut-off rolls. This last mentioned feature of the invention also serves the additional purpose of compensating for wear in the felt covers of the feed rolls.

In the drawing:

Figure 1 is a fragmentary transverse section through web feeding and cutting mechanism embodying the present invention as it appears in the napkin folding machine shown in my parent application.

Figure 2 is a fragmentary end elevation of the portion of the machine frame shown in Fig. 1, as viewed from its opposite side.

Like parts are identified by the same reference characters throughout the several views.

The machine frame comprises end standards such as that shown at 45, connected by tiebolts 47.

The paper web is fed over a guide roll 16 and across the usual triangle plates 17 to the usual felted feed rolls l8 and 19 whose shafts 52 and 53 are interconnected by gears 110 to rotate in unison.

The paper web is delivered by the feed rolls 18 and 19 on to one of a pair of cutting rolls 4Q 20 and 21, the former being provided with a knife at 23 and the latter with the usual registering slot at 22. The cutting rolls 20 and 21 are mounted respectively on shafts 58 and 56 which are interconnected by gears 112 and 111. Shaft 56 may be primarily operated by the source of power which drives the machine.

To transmit motion from shaft 56 to the shafts 52 and 53 which carry feed rolls 18 and 19, I provide on the outside of the machine frame, as shown at Fig. 2, gears 54 and 55 which are removably mounted on their respective shafts so as to be interchangeable with gears of other ratios, thus providing for a variation in the speed of the feed rolls relative to the cutting rolls. It will 55 be noted that the pitch circle of gear 55 is somewhat smaller than the circumference of roll 21, so that the peripheral speed of roll 21 will exceed somewhat the peripheral speed of the feed rolls 18 and 19, and in exchanging gears 55 and 54 for 0 others this condition is normally preserved so 1930, Serial No.

that the peripheral speed of roll 21 is always greater than any of the variable feeds available in feed rolls 18 and 19. The rate of movement of the paper web is determined by the feed rolls 18 and 19, the difference between this rate and the peripheral rate of cutting rolls 20 and 21 being accommodated by a slight slipping of the rolls on the web.

The slightly higher rate of lineal travel of the surfaces of rolls 20 and 21 as compared with the felted surfaces of rolls l8 and 19, ensures that the web will be held snugly about the periphery of cutting r011 21, and also ensures a clean cut by knife 23 regardless of the character of the paper which is being converted. The cutting blade will operate smoothly on the softest napkin under such circumstances.

The peripheral speed advantage of the cutting rolls is preferably sufiicient so that the length of the napkin may be varied within limits while preserving the speed advantage of the cutting rolls. For this purpose the gears 54 and 55 are interchangeable with other gears varying in number of teeth to change by comparatively minute amounts the rate of feed of the felted rolls 18 and 19 with respect to the constantly timed outting operation performed by knife 23 during the rotation of rolls 20 and 21.

Thereby the length of the napkin may be varied to satisfy commercial requirements of, for exam-- ple, twelve to fourteen inches and the wear in the felt covers of the feed rolls may also be compensatedfor by proper change gears. This makes it possible to use the felted rolls over longer periods of time without replacing than has heretofore been possible while keeping a substantially constant length of the blank severed by the cut-off rolls.

It will of course be understood that the rate changing gears 54 and 55 are merely illustrated and used for convenience as compared with any other rate changing mechanism for connecting shafts 56 and 52, and are understood to be equivalent to any standard form of rate changing means in this combination.

I claim:

In a device of the class described, the combination of a pair of cutting rolls arranged to slidably engage a web to be cut, a pair of feeding rolls supported in offset relation to said cutting rolls, means interconnecting said pairs of rolls and providing for a higher peripheral speed of said cutting rolls than of said feeding rolls, and means for driving said rolls.

SAMUEL J. CAMPBELL.

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