US2496365A - Wear take-up adjusting means for reciprocating knives of clothcutting machines - Google Patents

Description

Feb. 7, 1950 w. AARON WEAR TAKE-UP ADJUSTING MEANS FOR RECIPROCATING KNIVES 0F CLOTH-CUTTING MACHINES Filed July 17, 1946 IN V EN TOR.

Patented Feb. 7, 1950 WEAR TAKE UP ADJUSTING MEANS FOR RECIPROCATING KNIVES OF CLOTH- CUTTING MACHINES William Aaron-, Brooklyn, N. Y. Application July 17, 1946, Serial No. 684,191

3 Claims. (01. 30-273) This invention relates to cloth-cutting machines which are equipped with reciprocating knives; and the invention has reference, more particularly, to a novel construction of knife or cutting blade for such machines.

The invention has for an object to, -provide a construction of knife or cutting blade for clothcutting machines which is providedwith novel coupling means adapted to permit its adjustment relative to its driving means in such manner as v to change its operative position in the. machine, whereby to compensate for recession ofits cutting edge due to grinding down thereof bythe knife sharpening means with which cloth cutting machines of modern design are usually provided.

Other objects of this invention, not at. this time more particularly enumerated, will be understood from the following detailed description of the same.

Illustrative embodiments of this invention are shown in the accompanying drawings, in which:

Fig. 1 is a fragmentary side elevational view of a cloth-cutting machine of the reciprocating knife or cutting blade type, as equipped with the novel blade structure according to this invention; and Fig. 2 is a fragmentary front elevational view of the same, with parts in section.

Fig. 3 is an enlarged fragmentary view showing the novel coupling means of the blade as initially engaged with the blade drivingmeans, the machine standard and blade guide being shown in section; and Fig. 4 is a view similar to that of Fig. 3, but showing the novel coupling .means of the blade as adjusted relative to the blade driving means, whereby to advance the 7;

position of the blade cutting edgev in compensation for cutting edge wear.

Fig. 5 is a fragmentary face view of a modified form of cutting blade provided with the novel coupling means of this invention; and .Fig. 6 is a fragmentary face view of a. cutting bladeprovided wth a modified form of the coupling means.

Similar characters of reference are employed in the above described views, to indicate corresponding parts.

Referring to the drawings, the reference character I0 indicates the basevof a cloth-cuttin machine, from which rises the standard H in connection with the upper end of which is supported the head I 2 by which the motor andblade driving mechanism of the machine is carried. The standard II is provided with the usual forwardly open slot or guideway l3, in which the cutting blade, when it is operatively mounted-in ciprocating the cutting blade comprises a vertically reciprocable slide block M which runs in the slideway l5 with which the head I2 is provided. Said slide block I4 is reciprocated by a motor driven crank-wheel I 6, or like suitable 'means, to which it is operatively connected by a connecting rod l1. Means is provided at the .lower end of said slide block M for detachably coupling thereto the cutting blade I 8; said means comprising a dependent arm l9 which terminates in a coupler jaw 29, from one face of which projects an externally screw-threaded coupler stud 2| which is unitary therewith. Threaded onto said coupler stud 2| is a clamp nut 22 which is provided with a base flange 23 to oppose said coupler jaw 20. The upper end of the cutting blade I8 is ordinarily bifurcated to provide a notch for the reception of the coupler stud 2!, so that said blade end portion straddles the latter, whereupon it may beclamped between the coupler jaw 20 and the clamp nut 22, when the latter is tightened home on the coupler stud 2|, thus rigidly coupling the blade to the driving means by which it is vertically reciprocated in the slot or guideway 13 of the standard, and in such relation to the latter that its cutting edge 24 projects freely and forwardly from the same.

In modern cloth-cutting machines of. the reciprocating cutting blade type, means (not shown but familiar to the art) is provided which may be brought into' service from time to time, as

necessity requires, whereby to resharpen the ex- -It is to avoid this waste, and to permit extended use of a blade beyond the period when it would have to be discarded, which is the object of this invention to attain. To attain this objective, I have constructed the upper end of the blade in such manner as to permit its forward advancing adjustmentrelative the means by which it is operatively coupled to the reciprocating or driving mechanism therefor, whereby an additional amount of the blade material is made available for service, and subject to further sharpening thereof. To this end, the upper end portion of the machine, is reciprocated. The meansfor rethe blade I8 is provided with a bifurcated formabe longitudinally reciprocated thereby.

may be sharpened from time to time.

tion affording a downwardly extending entering notch 25 intermediate the arms 23 thereof. Said notch 25 communicates at its lower or inner end with a coupler stud receiving opening or transverse seating slot 27 of a height conforming to the vertical diameter of the coupler stud 2i, and of a width substantially exceeding the transversediameter or width of said coupler stud 2i. .Said opening or seating slot 21 is bounded on its outer or forward side by a perpendicular margin of shoulder 28 and on its inner or rearward side by a similar perpendicular margin or shoulder 28.

Preferably, the opposite sides of said coupler stud 2| are cut away to form perpendicular fiat abutsition in the machine, and in coupled relation to the driving mechanism therefor, the clamp nut 22'being loosened, the back edge portion of the blade is entered in the guideway 13 of the standard I l, and then the blade is pushed up ward to pass the coupler stud 2| through the notch 25 and entranceway 33 and into the receiving opening or seating slot 21. When thus disposed, the blade IB is adjusted so as to abut'the outer or forward margin or shoulder .28 of the opening or slot 21 against the outer or forward abutment face 30 of the coupler stud 2|, thus positioning the blade in operative perpendicular position, with its cutting edge 24 outwardly projecting from the guideway 13 of the standard I After the blade is thus operatively positioned, the clamp nut 22 is tightened home on the coupler stud 2|, wherebyto clamp the blade between the flange 23 of said clamp nut 22 and the coupler jaw 29. Owing to the provision of the bearing tongue 32, a generous and adequate bearing surface above the coupler stud 2! is provided on one face of the blade for frictional engagement by the coupler jaw 20, and on the opposite face of the blade for frictional engagement by the flange 23 of the clamp nut 22, whereby the blade is firmly gripped in an adequately balanced manner both above and below the coupler stud 2i, and thus strongly and non-shiftably coupled in operative relation to the slide block it so as to Such initial coupled relat on of the blade l8 to the driving mechanism therefor is shown more particu arly in Fig. 3.

During use of the thus initially mounted blade [8, as the cutting edge 24 thereof dulls, the same Such sharpening, as repeated, wears down said cutting edge 24, thereby causing it to "recede toward the standard I I. When, under such circumstances, the cutting edge 24 approaches the standard too closely for further eflicient operation, the blade may be adjusted laterallyto advance the receded cutting edge relative to the standard I I, whereby to again permt effective operation thereof and further continued use of the blade. To accomplish this, the clamp nut 22 is loosened to release engagement of the blade by the flange 2-3 thereof,

whereupon the blade may be moved laterally out- "ward until theinner or-rear'ward marginor Springing from the inner side of at 4 shoulder 29 of the seating slot 21 abuts the inner or rearward abutment face 3| of the coupler stud 2|, thus perpendicularly aligning the blade in such advanced position (see Fig. 4). After the blade is thus adjusted, the clamp nut 22 is again tightened home so as to bind the blade between its flange 23 and the couplerjaw 20. In

this adjusted position of the blade, the tongue 32 continues to dispose its opposite surfaces respectively for engagement by the coupler jaw 20 and clamp nut flange 23, so that the blade is strongly gripped and bound both above and below the seating slot 21 in a balanced grip adapted to firmly hold the blade subject to operation in its advanced position. It will be obvious, that, as thus repositioned, not only may further use of .the blade be made, but further resharpening of its cutting edge 24 may be carried out, until the latter recedes to the point where further use is impractical, and discarding of the blade finally unavoidable. The additional use, however, which the adjusted advance of'the blade permits adds greatly to the length of useful life of the'blade, and conserves the material thereof with resultant economy.

If desired, the adjustable blade may be provided with an additional rearward cutting edge .24 (see Fig. 5.), whereby the, blade may be reversed after one edge, as edge 24, has been consumed, thus further adding to the useful life of theblade. v

In Fig. 6 I have shown'a somewhat modified form of the coupling end portion of the blade, whereby instead of a single bearing tcngue32, 1 provide two bearing tongues 32' and 32" respectively springing from opposite sides of the notch 25, but separated to provide an intermediate entranceway 33' leading to the underlying seating slot 21. It will be apparent that said bearing tongues 32' and 32" provide the desiredbearing surfaces above the coupler stud 21 subject to the grip of the coupler jaw 20 and clamp nut flange 23. Having now described my invention, I claim: 1. In a cloth-cutting machine of the reciproeating knife type, in combination with the vertically reciprocated coupler jaw of the machine, a

screw-threaded coupler stud projecting from said jaw, a clamp-nut threaded onto said coupler stud, a knife attachable to said coupler jaw, said coupler stud being provided at respective oppositesides with perpendicular abutment faces, said knife having a bifurcated upper end port on pro; viding the same with a downwardly extending entering notch which terminates at its lower end in a transverse seating slot to receive the extension therethrough of said coupler stud, said seating, slot being of substantially greater width than the transverse width of said stud and of a height corresponding to the vertical diameter of said stud, said seating slot having perpendicular side margins respectively subject to abutmentby the respective abutment faces of said stud according to the laterally adjusted position of said 7 callyreciprocated couplerjaw of the machine, a

screw-threaded coupler stud projecting from said jaw, a clamp-nut threaded onto said coupler stud, a knife attachable to said coupler jaw, said coupler stud being provided at respective opposite sides with perpendicular abutment faces, said knife having a bifurcated upper end portion providing the same with a downwardly extending entering notch which terminates at its lower end in a transverse seating slot to receive the extension therethrough of said coupler stud, said seating slot being of substantially greater Width than the transverse Width of said stud and of a height corresponding to the vertical diameter of said stud, said seating slot having perpendicular side margins respectively subject to abutment by the respective abutment faces of said stud according to the laterally adjusted position of said knife relative to said stud, and said knife end portion having a clamp nut bearing tongue springing from one side of said entering notch but terminating short of the opposite side of the latter to provide an entranceway of a width adapted to pass said stud therethrough and into said seating slot, said bearing tongue being disposed to overhang said seating slot, whereby to be lapped by said clamp nut, in common with other areas of the knife adjacent said seating slot, so as to grip and rigidly hold said knife between said nut and coupler jaw in selected laterally advanced adjusted position.

3. In a cloth cutting machine of the reciprocating knife type as defined in claim 2, wherein the knife is provided with both forward and. rearward cutting edges, whereby to be both reversible and laterally adjustable relative to its coupled connection with the coupler jaw.

WILLIAM AARON.

REFERENCES CITED UNITED STATES PATENTS Name Date Banger Dec. 15, 1942 Number

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