US1700906A - Means of severing traveling webs of material into strips - Google Patents

Description

Feb. 5, 1929.

W. E. MOLINS MEANS OF SEVERING TRAVELING WEBS OF MATERIAL INTO STRIPS Filed Oct. 1926 2 Sheets-Sheet 1 Feb. 5, 1929. 1,700,90

W. E. MOI-INS MEANS OF SEVERING TRAVELING WEBS 0F MATERIAL INTO STRIPS Filed Oct. 1926 2 Sheets-Sheet 2 INVENTOR y m, a@4-%M*@M Patented Feb. 5, 1929.

PATENT OFFICE.

UNITED STATES WALTER EVERETT MOLINS, OF DEPTFORD, LONDON, ENGLAND.

MEANS OF SEVERING TRAVELING WEBS OF MATERIAL INTO STRIPS.

Application filed October 7, 1926, Serial No. 140,163, and in Great Britain October 15, 1925.

This invention is for improvements in or relating to means of severing a traveling web of material into strips in such a manner as to obviate the liability of the strips being deflected out of the normal path of the traveling web during the cutting operation.

The invention is applicable, not exclusively, to cigarette making machines of the continuous rod type wherein cork or like tipped cigarettes are manufactured. The tips are severed from a traveling web of cork or like material and each tip is fed on to a traveling web of cigarette paper which has previously been treated with an adhesive at the parts where the tips are to be applied.

It is important in a machine of this character to endeavour to feed the strips on to the web of cigarette paper in such a manner that the side edges of the tips are in alignment with the side edges of the traveling web of cigarette paper, and that when the cigarette paper is rolled around the continuous rod of tobacco the adjoining edges of each tip register correctly with one another.

In practice it has been found that when working at high speeds it is extremely difiicult both to feed the strips in correct alignment with the web of cigarette paper, and also to ensure that the top and bottom edges of each tip are in register when the web is rolled. The ditliculty arises mainly because the web, from which the tips are cut, is defiected during the shearing operation and consequently the commencement and termination of the cut is effected at points which are not directly opposite to one another on the web. Further the deflection of the web causes the tips to be fed out of alignment upon the web of cigarette paper.

It will be appreciated that the difiiculties referred to above are liable to occur in other devices where a travelling web of paper is severed into lengths, for example on printing machines where an impression is periodically imprinted upon a web of paper and the web severed into strips which are thereafter used as wrappers, labels, and the like.

It is an object of the present invention to provide means whereby strips are cut from a traveling web of material in such a manner that the web is not deflected during the shearing operation thereby permitting the strips to be fed in correct alignment.

The present invention consists of a means of cutting a traveling web of material (for example cork or the like) into strips which comprises moving two cutting blades relatively to one another, in such a manner that a str p is cut from the web by a cutting action which commences simultaneously at opposite points on the edges of the web and terminates substantially at the mid-width of the web.

Further the present invention consists in the provision of a pair of blades for cutting tips from a traveling web, adapted to move relatively to one another, in such a manner that the cutting action commences simulta neously at opposite points on the edges of the web and terminates substantially at the mid-width of the web.

Further the present invention consists of a cutting device of the type which comprises a pair of cutting blades adapted to move relatively to one another to shear a traveling web of material, into strips, characterized by one blade being shaped relatively to the other so that the cutting action commences simultaneously at the two extremities of the blades and terminates substantially at the midwidth thereof.

The invention is hereinafter more particularly described with reference to the accompanying drawings, in which Fig. 1 illustrates a cutting mechanism constructed according to the present invention, as applied to a cork tipping apparatus of a cigarette making machine.

Fig. 2 is a detailed side elevation of the fixed cutting blade illustrated in Fig. 1.

Fig. 3 is a side elevation of Fig. 2.

Fig. 4 is a plan view of Fig. 2.

Figs. 5 and 6 show one construction of the rotary blade of the cutting mechanism constructed according to the present invention.

Figs. 7 and 8 illustrate a modification of the rotary cutting blade illustrated in Figs. 5 and 6.

Fig. 9 is a perspective view of the fixed cutting blade, and

Fig. 10 is a fragmentary side elevation of the fixed cutting blade illustrated in Fig. 2 in direction A.

Referring to Fig. 1 of the drawings, a web of cork 1 is adapted to be fed, by means of a pair of continuously rotating rollers 2 and 3, towards a cutting device which comprises a fixed blade 4 and a rotary blade 5. The web 1 is adapted to be fed forwardly until the leading edge thereof engages with a web 6 of cigarette paper drawn around a roller 7.

As the leading edge of the web 1 of cork, meets the web 6 of cigarette paper, the edge 8 of a fiat face 9 on a roller 9 grips the cork and presses it upon the web of cigarette paper. As the web of cork is pressed upon the web of cigarette paper, the rotary blade 5 moves the web of cork into engagement with the fixed blade 4 so as to sever a tip from the web.

In order to ensure that the web 1 of cork is not deflected during the shearing operation of the rotary cutting blade 5, the cutting edge 13 of the fixed blade 4 is curved away from the rotary blade 5 in the manner illustrated in Fig. 4.

Due to the fact that the centre portion of the fixed cutting blade is located farther away from the rotary blade than the extremities of the same, the cutting face of the fixed blade is given a convex formation in the manner illustrated in Fig. 9, so that the edge of the rotary cutting blade engages with each point on the edge of the fixed blade during the entire cutting operation.

One method of forming a convex face on the under side of the fixed blade 4 comprises mounting two screws 10, one at either extremity of the blade which are adapted to bear upon the extremities of the same to give a concave formation to the under side of the blade. When the concave face has been formed on the blade, the same is machined until the curvature is removed, whereupon the screws 10 are slackened and a convex curvature of the desired radius is produced upon the cutting face of the fixed blade 4.

Referring to Figs. 5 and 6, which illustrate in detail a construction of the rotary blade 5, the cutting edge 11 is arranged parallel to the rotational axis of the blade. The fixed blade 4 is mounted relatively to the said rotary blade, in such a manner that a line joining the extremities of the curved edge of the fixed blade, lies parallel to the axis of the rotary blade. Preferably the rotary blade is constructed in the manner illustrated in Figs. 7 and 8, wherein the rotary blade is provided with a pair of curved surfaces 12, which are adapted to engage with the extremities of the cutting edge of the fixed blade 4, so as to allow the cutting edge 11 to be brought smoothly into engagement with the curved edge 13 of the fixed blade 4, thereby obviating any jar to the respective cutting edges.

It will be appreciated that although the invention hereinbefore set forth has been particularly described with reference to a cork tipping apparatus for a cigarette making machine, the same may be applied to any type of machine, wherein a strip of material is continuously fed through the machine and adapted to be severed into strips.

What I claim as my invention and desire to secure by Letters Patent is l. A cutting device comprising in combination, a rotary blade and a fixed blade having the cutting edge thereof curved away from the edge of the rotary blade and shaped in such a manner that the extremities of the two blades simultaneously engage with one another, as the rotary blade revolves, and thereafter shear one over the other to terminate the cutting operation at substantially the mid- Width of the two blades.

2. A cutting device comprising in combination, a rotary blade and a fixed blade having its cutting edge curved away from the rotary blade and the cutting face of the fixed cutting blade being of a convex formation and arranged so that the two blades simultaneously engage at their extremities as the rotary blade revolves and shear one over the other to disengage at substantially the midwid'th thereof.

3. A cutting device which comprises a rotary blade having its cutting edge parallel to its rotational axis, and a fixed blade mounted with the extremities of its edge lying in a line parallel to the rotational axis of the rotary blade, the cutting edge of the fixed blade being curved away from the edge of the rotary blade and the cutting face of said fixed blade being of convex formation so that the two blades simultaneously engage at their extremities as the rotary blade revolves, and shear one over the other to disengage at substantially the mid-width thereof.

In testimony whereof I hereunto afiix my signature.

WALTER EVERETT MOLINS.

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