US2518838A - Knife - Google Patents

Description

' A. TEMPE Aug. 15,1950

KNIFE 2 Sheets-Sheet 1 Filed June 6, 1946 Aug. 15, 1950 A. TEMPE 2,518,838

8 KNIFE Filed June e, 1946 2 Sheets-Sheet 2 flnire fmpe Patented Aug. 15, 1950 UNITED STATES PATENT OFFICE s 2,518,838 V t KNIFE Andre Tempe, West Orange, N. J.

Application J true 6, 1946, Serial No. 674,900 1 Claim. (cum-58) Q The present invention relates to improvement in knives intended for use in Scotch tape dispensing machines.

The purpose of the knives herein disclosed is to ;provide,means for severing the Scotch tape from the-feed roll of the machine when it is :desired to detach a given portion of the: length of the tape. 1

.blade. i Another object thereof is to provide a simple,

efficient and inexpensive cutting member for a tape dispensing machine which has the desired characteristics of sturdiness, dependability and ease in extricating itself 'from'the sticky or gummy surface of the tape;

A further object thereof is to provide a knife for the purpose set forth in which a plurality of abutting phonograph needles is provided for penetration with their sharp points into the sticky texture of the Scotch tape which adheres toithe feed roll into one of the peripheral grooves of which the knife retractedly extends;

A still further object thereof is to provide a specially shaped knife for use in a tape dispensing machine designed with the idea in 'view of adapting it'to penetrate the gummy tape known I .as Scotch tape without sticking to the severed parts thereof after the cutting operation is completed by the knife. I have found in practice that a series of closely contiguous phonograph needles with sharp points is best fitted to engage the sticky material of this kind of tape because the several points can separately be retracted from the sticky tape at the same time'by one cutting stroke of the knife more readily because presenting inappreciable surfaces which would not be the case if a straight edged knife blade were used. In the latter case, the entire surface of the edge of the cutting knife would engage at all points the sticky material of the tap during the cutting operation with the result that-at times the severed portions of the tape would cling onto the knife after the same is retracted out of cutting position withrespect to the feed roll.

Another object thereof is to provide varied types of multipoint cutting knives for interchangeable use in the tape dispensing machine.

The knife in each case, composed of the multiplicity of phonograph needles or'th'e like has a .cutting stroke imparted to it in the machine that directs it to enter any of a circumferentially .or the like.

With a cutter as'herein disclosed in at least one embodiment thereof, when one portion of the cutter becomes dull the cutter can be shifted orturned to bring into operative position a new or sharp cutting portion; A knife of this kind will therefore provide a longer useful life tha one having onl one cutting portion.

With the above and other objects in view, my invention consists in the arrangement, combination and details of construction disclosed in the drawings and specification, and then more particularly pointed out in the appended claim.

, In the drawings, wherein similar reference characters designate similar parts throughout the respective views, Figure 1 is a plan view, partly in section of th knife, forming the main part of my invention, 7

Figure 2 is a cross section taken on line 2-2 of Figure l, e 1

Figure 3 is a cross section taken on line 3-3- of Figure 1,

Figure 4 is a section taken on line i4 of ure 1,

Figure 5 is an end elevation of a modified form of my invention,

Figure 6 is a fragmentary section taken online 6-6 of Figure 5, I r a Figure 7 is an end elevation of a bushing flange, Figure 8 is a front end elevation of a mandrel, Figure 9 is a fragmentary view showing in end elevation a modified form of knife,

Figure 10 is a fragmentary side view of a wheel 1 carrying the knife,

Figure 11 is an end view of a mandrel, showing it partly broken away to disclose the anchorage for the pointed needles forming the cutter,

Figure 12' shows another modification of my invention,

Figure 13' is a transverse section of another modification of this invention, and

Figure 14 is a fragmentary front elevation of a further modification of this invention.

In the drawings, which are merely illustrative of my invention, all the parts of my invention are disclosed.

In the type of machine to which my knife appertains, there is shown a feed roll, intermittently rotated by an operating lever, all as set forth in my patent application on the machine hereinbefore adverted to. The Scotch tape as it is fed along the machinecofi the tape reel is wound up upon the afeed'roll and adheres to same in doing so. When the feed roll is intermittently rotated any given number of times it can be made to deliver a determinate portion of the length of the tape desired. The knife performs the function of penetrating the gumm or sticky material of the tape while the latter is adhering to the periphery of the feed roll which carries the tape forwardly. It does this in order to cut off the desiredportion of tape from the remainder of the tape on the tape reel.

In" order to'facilitate severing of the tape at the" desired point on the periphery of the feed roll, it isnecessary to cut the tape in such a manneras to minimize sticking of the severed portions of the tape still on the feed roll upon the cutting parts of the knife. For this purpose the knife of my design present a plurality of closely contiguoussharp points for penetration of the sticky tape material to sever it immediately, and to permit removal ofthe knife to inoperative position without any part'of the tape sticking to it.

In Figure l is disclosed a particular movable framein which'my knife is mounted. This is the frame forming part of the complete Scotch tapedispensing machine. This frame consists of apair of oppositely arranged arms H], II having bars I2 and is secured thereto upon their outer sides. Screws M arethreaded through'the bars l2 and I3 into theframe arms Ill and H, while the-heads'l5 of the screws are countersunk into the bars; This serves to unite the frame arms and bars-together in removable relation. There is a cross bar l1 connecting together at opposite ends the arms and'bars so they project in parallel relation at right angles to said cross bar. On arm II is apin I5 which is'engagedby a cam on the machine for imparting movement to the frame to make the -knife support an operating stroke'of' cutting the tape.

The knife mounted upon the-frame carries out the multi-point idea of my invention. It consists of a plurality of longitudinally extending phonograph needles having very sharp points. These needles aredesignated'zll and their sharp points are designated 2!, the tips thereof being denoted at 22.

A block IS has a mortised fit in the central part of the cross bar l'l'. The bar has the mortise l8 receiving the block snugly therein so'it is completely housed therein. Tie bolts 23 pass through the block and bar I i to clamp these parts secure- 1y together against the inter-posed row of phonograph needles Zl! as shown in Figure 3. For this purpose complemental semispherical depressions are formed as a continuous row upon both bar and clock. Those of the 'bar are designated l9b and those on the block Ma. The shanks of the needles 2G repose in these semispherical depressions which close against opposing halves of the diameters of the needles. In this manner the needles are c am ed in position in the frame.

It will be seen that the inner ends of all of the needles 2IJ terminate in lon itudinal alignment in the frame, and-fthat .the shank of all needles are in closely abutting relation for the entire row of needles. The row of needles extends longitudinally between arms I6 and H. In Figure 1 it appears that the needles 20 are of varying lengths and that they are arranged in the frame in such a manner that their points 2| form an arcuate cutting edge along the length of the knife thus composed. Therefore, the center needle is the longest and the needles recede inwardly from this center needle until the shortest ones are at the ends of the row. 54 designates the V-shaped notches intervening between the needle points 21.

In Figure 12 is illustrated a modified form of my invention. Here a series or row of phonograph needles are mounted in closely contiguous order abuttingly upon a mandrel 250, which is bored out as at 45. The several needles are shown formed with reduced inner ends 45 providing'annular shoulders 46 hereat. The outer surface of the mandrel is correspondingly formed with l'inearly arranged rows of phonograph needle receiving notches. The reduced inner ends 35 of the needles 33 are snugly fitted into the notches of the mandrel so that their shoulders rest upon: the periphery of the latter. The needles are'retained by friction in the mandrel. In this form of myinvention the needles are also shown to be of varying lengths with the longest needle arranged at the center of the mandrel. The entire line of needlepoints is acurved arcuate one,'convex with-respectito the axis of the mandrel;

In Figure 5, another form of my invention is disclosed. In-this-type; the cutting device is designed vto be mounted also'upon a mandrel but no longer are linear'rows' ofneedlesemployed but radiating needles arranged P in" a circular row. Figuredshowslthe mannerof assembling these various parts. The mandrel-is of the lever type, being .denoted'at 28; The mandrel is formed with acoaxial forwardly: extending screw'bolt 29 whose front'sfa'ce is designated 27. This boltisscrew threaded along its length.

A bushing this employedwhich is formed with abase fiange'3l at'rone "endand with upsettable fingers or arms-35 at its-other end. The bushing 30 fits around ithe'screw'bolt 29 and has its base flange-3i abutting the'shoulder of the mandrel 26 formed by reducing the diameter'of the screw bolt-29; The base flange 3| of the'bushing is formed with-,a circumferential series of holes 32. Themandrel has a pin 33 arranged flush with its peripheral edge as shown in Figure 8. When. the base flange 3Iof bushing 30 is presented in abutting'relation with the mandrel '26, the pin 33 of thelatter takes into one of the-"holes 32 of the base flange of the bushing.

Aplurality-of-phonograph needles or similar pointed members 38 areemployed for the purpose of being arranged into wheel formation as shown in'Figure-5. A-disk'SIa has an operiing'through which bushing 30 projects so as to mount the disk .upon this bushing; The inner'ends of the needles 38 are interposed between the base flange 3| of-the bushing and this disk 3min such a manner that the needles. are-clamped therebetween-frictionally; Initially; the upsettable fingers 35 of the bushing are brought back into contacting engagement with disk 3la so as to close the disk against" the needles 33. The

needles, thus initially inserted between the disk 31a and" the base flange 3! as between oppositely arrangedretaining walls, may now manually or otherwise be distributed so that while their innermost ends contactftheperiphery of the bushing 'llljtheir shanks will be caused to be spread apart sets to radiate like spokes from a wheel. The inner ends of these needles 38 abut as at 55a, but each pairof successive needles divergeoutwardly from the bushing,*leaving elongated V-shaped spaces 55 between the several needles 38. The needles having thus been properly spread apart and anchored between the flange 3| and the disk 31a, a washer 36 is slid over the screw bolt 29, and made to contact the fingers 35 of the bushing 30. Then anut 3'! is screwed home on the screw bolt 29, and clamps against the fingers 35 and causes these fingers to be solidly mashed against the disk 31a, which in turn presses against all of the needles 38 with a clamping action. In this manner all of the needles are anchored in position.

' In Figure 11 a mandrel 26a is providedlwith linear rows of the phonograph or other needles, which rows of needles form a scanty number of radiating sets upon the periphery of the mandrel, three sets being illustratedin Figure 11. The needles 43 comprising each linear set have their sharplmints arranged in convex disposition with respect to the axis of the mandrel 26a. 'These needles have their inner reduced ends 45 anchored firmly and removably into the mandrel peripheral surface, or they may be screwed in if desired.

In Figure 9 another modified form of my invention is disclosed. The mandrel 26 is of the same form of construction as is shown in Figure 6. However, as shown in Figure 10, the circumferentially extending series of radially disposed needles 42 which radiate from the mandrel are formed integrally or cast in one piece with a wheel or disk 4|. This wheel has a central opening 4la, through which the screw bolt '2l projects to properly center the wheel upon the mandrel.

The screw bolt 27 forms a coaxial continuation of the mandrel here as in Figure 6. A washer 35 is mounted upon the screw bolt and bears directly against the wheel or disk 4|. A nut 31 screws home upon this bolt for jamming the washer against the wheel, and the wheel against the mandrel endwise of the latter.

The use and operation of my invention is as follows.

It will be understood, as reference to the disclosure in my divisional application for patent on the complete machine assembly will reveal, hereinbefore adverted to, that any of the types of knives illustrated in the drawings are used in connection with the feed roll of the machine, which feed roll is itself covered by another divisional patent application of mine filed of even date with the application on theeomplete machine assembly.

The feed roll is formed with parallel rows of annularv grooves peripherally thereof, and also with transversely disposed grooves or slots which intersect the annular grooves. In this manner spaced apart lugs are provided upon the feed roll and bridged across these in succession peripherally of the roll is a longth of Scotch tape being unwound from the tape reel which is mounted at the rear end of the machine.

When the actuating crank handle of the machine turned, a portion of the tape unwound from the reel is wound up upon the feed roll, and is in flat contact therewith. The depressible frame for the knife shown in Figure l is located on the machine in a position where the row of n e e dle points may be thrust into any of the transfeed roll, across which a portion of the tape to be severed is bridged. The frame is depressed, and the'phonograph needles are brought down into a slot and caused to penetrate the transverse line of the bridged portion cfthe tape, on the feed roll The needle points separatelyenter the material of the stick gummed tape, and all of them at the sametime perforate the tape but at the sametime-spread 'out the perforations until they merge with one another to completely sever the -tapej From Figure 1 it is seen that the taperingfendsfzl of the needle points act as spreaders'to enlarge the holes made in the tape by the points 22 of the needles. The separate points also are able effectively to extricate themselves from the sticky material of the tape quickly, without lifting the tape in adhering relation.

Thetapes' come in varying widths and the feed roll will accommodate all such varying widths. The arcuate line of needle pcintspresented by some of the types of knives illustrated in the drawings, which is convex with respectto the base line of these needles, is made to serve the office of increasing the spreading action of the needles at the center of the tape to be severed and decreasing the amountofspreading done-on the holes by the needle points forming same at the ends of the tape. It is evident that the descent of the knife composed of such arcuate series of needles raises the end needle points above the tape slightly with respect to the needles in the center which fully penetrate the tape.

This results in quickly retracting the needles from the tape after the required portion thereof has been detached because the margins of the tape would ordinarily be stripped off from the feed roll more rapidly than the center portion, and so at the margins frictional engagement of the knife is at a minimum.

There is also provided a type of knife in which phonograph needles are not employed. Instead there is illustrated a row of individual cutting points formed upon rods, or else upon wheels, as may be desired. The characteristic of this type of cutter is that each separate pointed element consists of a two-faced member. The oppositely inclined faces 49 and 50 of each cutting element converge peripherally to form cutting edges 55. The points of these elements are designated 53 and the same tapering surfaces thereof are provided as are provided upon the points of the phonograph needles. Here however, the oppositely arranged sides or faces 5|, 52 of the cutting elements converge to form the tapering portions. This form of knife operates in the same way already explained in connection with the phonograph needles.

In Figure 6 is shown a type of cutter where the mandrel 26 upon which the needles are mounted has a swinging action instead of a reciprocating one as is true of the frame shown in Figure 1. Lowering of the lever mandrel results in depressing the row of needles into the required transverse slot of the feed roll; the mandrel could be made to rotate as it swings downwardly to position the cutter in the slot.

The form of cutter mounting shown in Figures 6 and 9 is such that entry of the pin 33 of the mandrel into any of the openings 32 of the centering flange or disk of the needle carrier prevent independent rotation of the mandrel with respect to the carrier and vice versa. In Figure 6 it is seen that by removing the nut 31, sufficient friction can be taken off the disk 3|a that binds against the needles to permit any of the latter to be removed.forsreplacement purposes In Figure 3 :by removing the :block .I9the needles can also beieasily removed.- Where the cylindrical row'iofphonograph needles mounted wheel-like isused aso-shown in Figure 5,-the-same gradu ated depth of penetration of the successive needle points is had as has been hereinbefore described since the teeth everywhere on th peripheryof the mandrel present arcuate lines ofneedle points.

InFigures 11 and 13 thetype of knife shown lends itself to intermittent rotation to present any of the successive rows.- of needle points against the tape to be severed. Intermittent feed means is present inwthe complete machineefor this purpose.

IrdQ nOt mean to confine'myself to the-exact details of construction herein disclosed but claim all: variations falling within the purviewf the appended claim. I

What I desire'to claim and secure by patent is:

In combinationwith a mandrel, a screw bolt formed as a coaxial reduced continuation "there of,: a bushing having abase flange-said bushing surrounding. the screw bolt with its base flange abutting vthe mandrel endwise, said mandrel and base fiangehaving-a spin and holexconnection .to prevent independent rotation of the bushing upon the screw bolt, a disk fitting saidbushing, a circu: lar-series of phonograph needles having their in: ner ends seated upon said bushing held between the base fiange and-thedisk, said bushing having upsettablearms-bent back against saiddisk to retain said disk upon the bushing, and a nut screwing home on said screw bolt and abutting the upsettable arms to clampv the-same against the disks vr ANDRE lEMPE.

REFERENCES'. CITED The following referencessare of record file of this :patent:

UNITED STATES PATENTS 1,958,694 Chandler 'May 15, 193.4

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