US1994385A - Edge trimming attachment - Google Patents

Description

March 12, 1935. CHUDNER 1,994,385

EDGE TRIMMING ATTACHMENT Filed Jan. 23, 1934 2 Sheets-Sheet 1 INVENTOR WITNESSES Z 4 fl y 2.9 BY Jose 1h C(zudzzer ATTpai'u EYS March 12, 1935.

J. CHUDNER EDGE TRIMMING ATTACHMENT Filed Jan. 25, 1934 2 Sheets-Sheet 2 WITNESSES INVENTOR [1590/1 fi/zudn'er BY M W W I ATTOR Y5 Fatenteci Mar. 12, 1935 I UNITED- STATES, PATENT OFFICE 1' i i ,,l,994,3 85 7 r EDGE TRIMMING ATTAC MENT" I 'Josepl1 Chudner, Brooklyn-N. Y. 7 Apmsatmn January 23', m4; Serial No. 707.993

' 3 Claims. 401.112. 122) f i This invention relates toa deviceor attachment accomplished by the employment of a pivot on which may be used advantageously in conjunction arbor23, fixedly secured to a short arm 24 secured with a sewing machinels'euthat goods -can be to the shaft 22 by a pin 25. The blade 19 has-a stitched and edge trimmed in one operation. hole in one end thereof which-receives the re 5 .Some of the advantages of the device or atduced adjacent end 26 of the shaft 22, and said- 5 tachment are: it enables convenient adjustments blade is also secured to the outer end of the arbor to suit varieties of work and to compensate for 23, by a screw 27. The shaft 22 is supported by wear of'parts thereof; it preventsmaterial from the bearings 18, and has axial and also rocking interfering with the proper operation of the movement in said bearings. The bar 20 is held lO needIe, by turning the trimmed portion sidewise in place by the bed 10, plate 12 and block 14, and and, at the same time, allows anoperator to clear: also bya set screw 28 carried by a lug 29 on the ly view the work while operatingthe machine to block 14. The block 14 has a groove 30 to receive secure accurate workwith clean cut edges; and it one edge of the bar 20. By loosening the screw 28, embodies novel features of constructionandop the-barg20 may be slid to various positions of 15 erationwhereby sewing machines already in use adjustment in order to trim the material or cloth: 5

may be equipped with cutters without requiring at various distances with respect to. the line of V alteration of the machines. V stitching indicated at 31. The bar is cut away The invention consists in the improvements, as as at 32 to accommodate a suitable tool for ad-v hereinafter described and claimed and as illusjusting it. Theshearing line of the elements 19 20 trated by way of example in the, accompanying and 20 will be adjacent the edge of the material 20, drawings, in which or cloth being fed in the usual manner, and said.

Figure 1 is a plan view of the device or attachline will be parallel to the stitching line 31, as ment operatively connected with portions of a shown most clearly in Fig. 1. Resilient means is sewing machine; employed to yieldingly hold the'blade 19 against Fig. 2 is a View looking at the under side of the the cutting edge 21 to thus steady the blade 19 5 cutter unit; and keep it in proper relation with respect to the Fig. 3 is a section taken on the line 3-3 of edge 21. The resilient means consists of a strip V 33 of spring steel and this strip 33 is substantially Fig. 4 is a section taken on the line 4-4 of 'L-shaped and has one end thereof secured to Fig. 1, a portion of the link being broken away; the part 14 by a screw 34, and its opposite end has 30 Fig. 5 is an end view of the connection applied a notch 35 therein so that said end may be disto the feed lifting rock. posed against a shoulder 36 on the projecting end The device or attachment, by way of example, of the shaft 22 opposite that having the blade 19. is shown applied to a sewing machine, and in the The shaft 22 is grooved to provide the shoulder 36 35 drawings there are illustrated portions of the maand the reduced portion of the shaft is disposed 35 chine directly involved consisting of a bed 10, a in the notch 35, as shown in Fig. 2. The spring feed lifting rock 11, supported by suitable bearings strip 33 constantly urges the shaft 22 axially in on the under side of the bed 10 near the rear, and one direction to yieldingly hold the blade 19 a throat, feed and needle plate 12, which is deagainst the cutting edge 21 of the bar 20. The

40 tachably secured to the bed 10 by screws 13, the block 14 has a recess 3'? in the under side thereof 40 plate 12 being flush with the upper surface of the to accommodate the arbor 23 and the arm 24 and bed 10. so that the block will serve as a guard therefor.

The device or attachment includes a unit which The block embodies a stop 38. When the screw 28 is secured in position with respect to the needle. is loosened for the purpose of adjusting the bar p The unit includes a part or block 14, which is se- 20, the blade 19 may be adjusted at the same time, 45 cured to the plate 12 by screws 15 and to the bed by reason of the fact that the shaft 22 may have 10 by a screw 16. The block 14 has a projection axial movement and also by reason of theresil- 17 over which the material or cloth M to be iency of the spring strip 33. If the blade 19 is stitched and trimmed rides. The block 14 also emremoved for any reason, the stop 38 will be enbodies spaced bearings 18. The unit also includes countered by the end of the arbor 23 which pro- 50 a trimming or shearing couple consisting of a jects through the arm 24, and thus prevent disknife, cutter or trimmer blade 19, and a bar 20 placement of the shaft by the spring strip 33. having a shearing or cutting edge 21 with which The blade 19 is secured to move or rock in a the blade 19 cooperates. The blade 19 is secured vertical plane with respect to the cutting edge 21,

to a shaft 22 for movement therewith. This is' to produce the shearing or trimming action in 55 which is disposed eccentric to the center or axis of the element 42, as shown in'Fig. 5. The element 42 is held against rotation by a set screw 44 screwed in a tapped hole in the piece 39. A

link 45 has its upper end pivotally and slidablyconnected with the arbor 23, andthe lower end of the link is connected with the pivot 43'. It' will now be understood that the blade 19 will have rocking motion imparted thereto in response to the rocking motion of the rockl'l, through the intervention of the shaft 22, arm

derstood that the rock 11 will beput in motion when the sewing machine is being operatedirr the usual manner for stitching the material or cloth. Asthe material or cloth is being fed in the usual manner to be stitched, an edge portion thereof will be trimmed off in the same operation.

The blade- '19 has an upwardly projecting por- 7 tion- 46 which serves as a guard and deflector to cause the cut edges of the material or 'cloth to niove away from the needle so as not to inte'rfe're with the proper operation thereof. p I When it is desired to adjust the-blade 19' for 7 any reason, such as to compensate for a decrease in the size of the blade due to repeated sharpen-ing thereof, the set screw 44 may be loosened and the" element 42 rotated to change the position 'of the pivot 43, to thereby adjust the blade with respect to the cutting edge 2l for the proper cutting'o'r trimming action. Attention is also cal-led to the fact that the sliding connection betweenthe upper end of the link 45 and the arbor 2 3, enables 24,, arbor 23, link 45, element 42, and piece 39. It is to be unadjustments to be made to the cutting bar 26 and parts interthe blade 19 without detaching the posing the arbor 23 and the rock 11.

1. In an edge trimming attachment for a sew ing machine, a shaft mounted for axial and rocking movement, a cutter having one end connected with one end of said shaft, an arm secured to said shaft, an arbor fixed at its opposite ends to' the arm and cutter in spaced relation to said, shaft; and means so connectedw-itli arbor to rock said cutter, yet allowing axial movement of the shaft.

2. In an edge trimming attachment, a block embodying" bearings, a shaft supported for rocking movement by said bearings, a cutter having one end connected with a projecting end of the shaft, said block having a recess in the under side thereof, an arm secured to said shaft and dispe'sed saidree'ess, an arbor fixed to the and cu-tter and extending in said recess, and

I as to cause motion of the arbor, arm and shaft,

means'connected with the arborto' cause motion of maroonarm and shaft; te rock said cutter. g 1

3'. In an edge-trimmingattachment for a sewing machine, a fixed part havingbearings; a

shaft supported bysaid bearings for axial and rocking movemenman arm secured to said shaft"- intermediate the ends of the shaft, a bar having acutting edge on one end thereof, a cutting blade having one'e'ndsecured to said shaft, an arboffixed at-its opposite ends to said blade and atmftdi mount theblade for rocking motion with'said' shaft 'toproducea shearing faction inconmnction with saidcutting edge,- resilient'means-se cured to said fixed part and engaged with said v shaft to urge it axially in-o'ne direction to main- 7 tai-n said-bladein eooperative'slrearing' relation to 'said cutting'edge, and meansf-connected wi'tfr" the arbor to operate the latter to ing motion to the blade. 6

JOSEPH CHUDNEBQW

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