Патент USA US2105346код для вставки
Jan. 11, 1938. ' F.,M. CARD ' 2,105,346 SEWING AND TRIMMING MACHINE Filed May 12, 1936 77 1/91 3' Sheets-Sheet l Jan. 11, 1938. 2,105,346 F. M. CARD‘ SEWING AND TRIMMING MACHINE Filed May 12, 1936 3 Sheets-Sheet 2 amen/10f» ?ederio 1”. Card Jan. 11, 1938. F. M.‘ CARD 2,105,346 SEWING AND TRIMMING MACHINE Filed May 12, 1936 3 Sheets-$11691; 3 1% 3 ‘W"M5 ?edera'c M Cami ‘mwm = ' Patented Jan. 11, 1938 2,105,346 UNITED STATES PATENT OFFICE \ 2,105,346 SEWING AND‘ TRIMIMING MACHINE Frederic M. Card, Bridgeport, Conn., assignor to The Singer Manufacturing Company, Eliza beth, N. J., a corporation of New Jersey Application May 12, 1936, Serial No. 79,231 ' . 4 Claims. This invention relates to improvements in trim mer mechanisms and more particularly in trim mer mechanisms of sewing machines, the inven _ tion having for its primary object to provide a . durable actuating means for a trimmer mecha nism adapted to effect the production of smoothly trimmed and sharply curved work-edges. With the above and other objects in view, as will hereinafter appear, the invention comprises 1 0 5the devices, combinations and arrangements of parts hereinafter described in connection with the accompanying drawings which illustrate a preferred embodiment of the invention and in' P which? Fig. 1 is a rear side elevation, partly in section, (Cl. 112-127) frame I | swings about an axis in parallelism with the axis of rotation of the main shaft 6. Swing ing movements are imparted to the frame H by a crank-arm l3 at one end of a rock-shaft l4, journaled horizontally in the bracket-arm 4, as more fully illustrated and described in U. S. Pat ent No. 1,884,404, Oct. 25, 1932, W. C. VanNess et al. The needle |ll cooperates, in the formation of lock-stitches, with the usual loop-taker (not shown) disposed within the upper end of the 10 frame post 2. In the operation of the sewing machine, the work is continuously advanced by a feed-wheel l5 projecting through a suitably slotted throat plate l6 secured upon the upper end of the work 15 of a sewing machine provided with the improved supporting post 2, the line of feed lying in the trimmer-actuating mechanism. vertical plane of lateral movement of the needle H1. The feed-wheel |5 may be rotated by any Fig. 2 is an en larged front end elevation, of the machine, partly in section. Fig. 3 is a detail view in elevation 20 of the trimmer-knife throw-in lever. Fig. 4 is a top plan view, partly in horizontal section, of the sewing machine and the trimmer-actuating mechanism combined therewith. Fig. 5 repre sents a substantially vertical section of the coun 25 ter-shaft crank and pitman. Fig. 6 represents a longitudinal section of the crank-actuated pit man, taken substantially on the line 6—6 of Fig. 5. Fig. '7 represents a transverse section of the pitman, taken substantially on the line '|—'| of 30 Fig. 6. The present invention constitutes an improve ment in the trimmer-actuating mechanism of the pending U. S. patent application of Roy Painter, Serial No. 66,012, ?led Feb. 27, 1936. Re: 35 ferring to the drawings, the improved trimmer actuating mechanism is illustrated as embodied in a sewing machine having a frame comprising a bed-plate I, from one end of which rises a work supporting post 2. Upon the opposite end of the 40 bed-plate | is the supporting standard 3 of a bracket-arm 4 which terminates at its free end in a head 5 overhanging the work-supporting post 2. Rotatably journaled in the bracket-arm 4 is a 4 (21 horizontally disposed main actuating shaft 6 carrying at one end a combined belt-pulley and balance-wheel 1. At itsopposite end, the main shaft 6 is provided with a crank-disk 8 oper atively connected to reciprocate a vertically dis 50 posed needle-bar 9 carrying at its lower end a needle Ill. The needle-bar 9 is journaled for endwise reciprocation in suitable bearings pro vided in a swinging frame || pivotally hung at its upper end upon a fulcrum-pin l2 suitably se 55 cured in the bracket-arm head 5 so that the suitable actuating mechanism, the present feed~ wheel actuating mechanism being similar to that disclosed in the above noted U. S. Patent No. 1,884,404. It will be understood that the needle I0, while-in the work, moves laterally in the di rection of feed and that the return movements of the needle are effected while out of the work, so that the feeding of the Work is assisted by the needle. Opposed to the feed-wheel is a presser roller |‘| closely adjacent to and at one side of the plane of needle-reciprocation, said presser roller being carried by the lower end of the usual spring-depressed presser-bar |8 journaled for vertical movements in the bracket-arm head 5. Secured, by screws l9, to the under side of the bracket-arm 4 is a trimmer bracket 20, providing bearings in which a knife-bar 2| is journaled for endwise reciprocation in a vertically inclined path. Carried by the lower end of the knife-bar 20 25 30 35 2| is a knife-holder 22 to which a work-severing element in the form of a straight-edge trimmer knife 23 is secured by screws 24. While the cut- 40 ting edge of the knife is straight, it is preferably inclined downwardly in the direction of feed, as illustrated in dotted lines in Fig. 2 of the drawings. The trimmer-knife 23 has a path of movement to sever the work substantially par allel to the line of seam formation and at the side of the path of the needle opposite to the presser roller |‘|. Suitably secured upon the knife-bar 2| is a collar 25 pivotally connected by a link 26 to an 50 arm 21 of a bracket carried by the lower end of an actuator-bar 28. The actuator-bar 28 is con ?ned to vertical reciprocation in suitable guide slots provided in the bracket-arm head 5, said P bar 28 having in its outer edge a notch 30 adapt- "0 2 2,105,346 ed to receive a coupling-pin 3|. The coupling pin 3| is carried by the free end of a crank-arm 32 extending horizontally forward from one end of a rock-shaft 33 disposed substantially parallel Extending rearwardly from the rock-shaft 33 and rigidly secured thereto is a forked rock-arm 55, the spaced members 5| and 52 of which are provided with horizontally alined apertures slid- , ably receiving a pin 53 disposed substantially to the main shaft 6, said rock-shaft 33 being journaled for rocking and endwise movements in bearing-lugs 34 upon the machine bracket-arm, parallel to the rock-shaft 33. The pin 53 has a longitudinal bore 54 preferably receiving a Wick at the rearward side thereof.’ 55, said bore 54 being intersected .bycagplural . . .. 1 U1. ity of radial ducts 56 provided in said pin. to 10 rock-'shaft 33 has a circumferential groove 35 ' conduct lubricant to the bearing faces in the 10 embraced by a suitably notched ear 36 upon a 1_ rock-arm members 5| and 52 for the pin 53. Rigidly secured by a screw 51 upon the slide The trimmer throw-out hand-lever 3?. I _ hand lever 31 is pivotally mountedupon a horizon ‘pin 53,‘ between the rock-arm members 5|, 52, is the apertured lower end of a vertically dis tally disposed fulcrum-screw 39 extending trans 15 versely of the main shaft 6 and threaded into a, posed pitman 58. At its opposite end, the pit 15 At its end opposite to the crank-arm 32, the boss 40 upon the machine bracket-arm 4;.- The hand-lever 3'! depends below the bracket-arm vman 58 is apertured to pivotally embrace a crank~ pin 59, extending from a crank-disk 65 at one end 4 so as to be conveniently accessible fromthe 1‘ of a rotary counter-shaft 6|. front side of the machine, said hand-lever be ing spring biased in a direction to releasably hold the coupling pin 3| in the notch’ 35 of the ac-. tuator-bar 28. A coil-spring 4| has its-opposite ends connected to the bracket-arm- 6 and to: the knife-bar 2| to’ retract said knifeebar- from op 25 erative position and thereby to- raise the actua The pitman 58 is _,restrained against movement endwise of the crank-pin 59 by a collar 62 suitably secured‘upon said crank-pin Thecounter-shaft 6| is‘ disposed substantially parallel to the ' main shaft" 6; and; is journaled in ?anged bearing-bushings 63 and. 54 suitably secured in horizontally apertured lugs‘ to disconnect the coupling-pin fromv the actua 65 and 66 of a bearing-bracket 6'|.v The bracket 25 67 is secured by screws 68 upon the machine. bracket-arm’ 74 so that the counter-shaft bears tor-bar 28. ing lugs of said bracket 61 extend rearwardly tor-bar 28 when‘ the hand-‘lever 3'! is operated . r : Suitably secured upon the trimmer-bracket-ZB, at the rearward side thereof, is an auxiliary from the bracket-arm 4. bracket-plate 26' havingits upper end‘spaced ter-shaft 6| is a groovedpulley69= connected by a belt 16 to a pulley '|| carried by the ro-" tor-shaft 12 of an electric motor 13... Theelec from the bracketZll to receive'therebetween a throw-in hand-lever for the trimmer-knife. This hand-lever comprises complemental leverV-"rnem-v ' bers 42, 43 ‘pivotally mounted adjacent each oth er uponastud-bolt 44. The member 42 has a . ~ Suitably secured upon one: end of the coun 30 trio motor 13 is mounted upon a bracket ;14_>se-. cured by screws 15 uponzthe' rearward side of the supporting standard 3 of‘ the sewing‘ ma laterally offset extension 45‘ overhanging the up chine bracket-arm, said electric motor 13 being per end of the lever-member 43 and to this ex; preferably provided with an electric-currentcon trolling switch 16.7 The pulleys 69' and "H are preferably proportioned so that thecounter-shaft 40 6| is rotated at a lower rate ofv speed than the speed of rotation of the rotor-shaft 12; In order to supply lubricant to the counter. shaft bearings, the bracket-lugs 65~and 66: are each provided with upstanding and vertically 45 tension is suitably secured'a bentspring/ 46 bear, 40 ing against the lever-member 43 below the piv otal axisthereof; said spring 46 functioning to yieldingly hold the lever-members 42, 43 against relative movement. The. lever-member 43 of said hand~lever is yieldingly- held by a spring ‘ (3? against a fixed stop-pin 43 extending inwardly from the bracket-plate Zll'and determining: the normal inoperative position of the hand-lever 62, 43. The offset extension. 45' of the lever-mem ber .42 is‘ adapted to engagethe upper end of 50 the knife-bar '2|~ upon operation of the hand lever 42, 43 and, as the bent spring 46 isstrong er than the spring 41, the knife-bar 2! may be depressed by said hand-lever until the coupling pin 3| enters the notch 38 in theactuator-bar 23. However, as theVthrow-in movement-cf the knife-bar 2;! serves to initiate reciprocation. of theactuator-bar 28 by the rock-shaft 33,‘ the rapidly succeeding’ rising movement of the knife bar 2| with the actuator-bar 28 reacts against 60 the hand-lever extension 45 before the member . 43‘ of the hand-lever can be released by the op erator. It is at this time, primarily, that the spring 46 functions to permit the member 52 of the hand-lever to-yield relatively to the mem ber 43, thereby absorbing the vibratory action apertured bosses ‘H, the apertures 18>in'said bosses (Fig. 5) being alined with lug-apertures 79 forming lubricant’ wells below the bushing.; apertures in said lugs. Each bushing’ 63011 64, is diametrically apertured to provide a restricted 50 duct- 86, connecting the boss-aperture. 18' with the shaft-bearingv face of the bushing, and a larger duct 8| alined with'thelug-well 19. Pref erably, a wick 82 is disposed in thenwell 19; and extends throughthe bushing-duct 8| into’ con 55 tact’ with the counter-shaft’ 6|. VThe boss-ap erture 18 is yieldingly closedyat its upper end by a suitable spring-pressed valve 83,v while the bushing, 63 or 64, is provided in itsshaft-bear ing face withintersecting spiralgrooves 84. , Oil 60 introduced i-ntothe boss-aperture 18, through the valve 83, passes through the'ducts 80 and 8| into the well 19, from which it is conducted by the wick 82 to the shaft and is distributed by the bushing-grooves.“ lengthwise andcircum 65 that would otherwise be transmitted to the hand ferentially of the shaft-bearing face of the bush of the operator. The hand-lever member 43 is, inthe present instance, provided with a headed mg. stud 49 which serves as a steadying guide for of with a bore 85 (Fig. 6) of which the upper end is enlarged to form a reservoir 86 adjacent 70 the lower arm of the member 52 of saidhand lever. From the foregoing description it will be understood that the trimmer-knife carrying bar 2| maybe connected to and disconnected from the rock-shaft 33 at the will of the opera-_ tor during'the operation of the machine. > ' The pitman 58 is provided longitudinally there the cranképin 59. Intersecting. the lower por-_ tion of the reservoir 86 is a transverse pitman; bore 87 conneoting'said reservoirwith the crank pin bearing face of the. pitman. Disposed in the transverse bore 81 is a wick 88in wipingengage 75 2,105,846 ment with the crank-pin 59. The upper end of the reservoir is, preferably, yieldingly closed by a spring-pressed valve 89, while the lower end of the pitman-bore 85 is alined with a radial duct 90 provided in the tubular slide-pin 53. Partly embracing the crank and pitman con nection between the counter-shaft GI and the rock-arm members 5|, 52, is an oil-guard bracket 9| which is substantially C-shaped in vertical 10 section, said bracket having a laterally extending shank 92 secured by screws 93 to the under side of the bracket-lug 65. The lower portion of the bracket 9| has side walls 9|’, thereby to provide a well for collecting lubricant thrown off by the 15 actuating mechanism embraced by the bracket. From the foregoing description, it will be un derstood that when the electric motor 13 is in operation, the rocker comprising the rock-shaft 33 and its crank-arms 32 and 50 is continuously 20 actuated, the reciprocation of the trimmer-knife 23 being dependent upon whether or not the cou pling pin 3! is in operative engagement with the actuator-bar 28. By swinging the hand-lever 31 to the right, as viewed in Fig. 1, the rock-shaft 25 33 is shifted endwise to disconnect the coupling pin 3| from the actuator-bar 28. The slide-pin 53 connection between the pitman 58 and the rock-arm 50 leaves the pitman 58 unaffected by the endwise movements of the rock-shaft 33. It will be further understood that the trimmer knife 23 may be rendered inoperative by discon necting the electric motor 13 from its source of power, whereby the sewing machine may be op 35 erated without actuating any portion of the trimmer mechanism. On the other hand, the trimmer mechanism and the work-feeding mech anism of the sewing machine may be caused to operate conjointly, without stitching, by merely 40 removing the needle 10 from the needle-bar. Having thus set forth the nature of the inven tion, what I claim herein is:-— 1. The combination with a sewing machine having a rotary actuating shaft, and stitch-form ing mechanism deriving actuation from said shaft, of a trimmer mechanism comprising a re ciprocatory trimmer-knife actuating bar, a driv ing shaft rotatable independently of said sewing machine actuating shaft, a counter-shaft opera tively connected to rotate with said driving shaft, a two-armed rocker having one arm operatively connected to said trimmer-knife actuating bar, an actuating member pivotally connected to the 3 other arm of said rocker, and means carried by said counter-shaft for actuating said member. 2. The combination with a sewing machine having a rotary actuating shaft, and stitch-form ing mechanism deriving actuation from said 5 shaft, of a trimmer mechanism comprising a re ciprocatory trimmer-knife actuating bar, an elec trio-motor operable independently of said sew ing machine actuating shaft, a counter-shaft, driving connections for rotating said counter shaft from said electric motor, a crank-member carried by said counter-shaft, a rock-shaft hav ing a plurality of crank-arms, one of.said crank arms being operatively connected to said trim mer-knife actuating bar, and a pitman connect 15 ing the counter-shaft crank-member and the other arm of said rock-shaft. 3. The combination with a sewing machine having a rotary actuating shaft, and stitch-form ing mechanism deriving actuation from said shaft, of a trimmer mechanism comprising a reciprocatory trimmer-knife actuating bar, a rocker shiftable lengthwise of its pivotal axis into and out of operative engagement with said bar, manually operable means for axially shifting 25 said rocker, a driving shaft rotatable independ ently of said sewing machine actuating shaft, a counter-shaft operatively connected to said driv ing shaft, and an axially shiftable pivotal con nection between said rocker and said counter 30 shaft. 4. The combination with a sewing machine having a frame including a work-support and a bracket-arm overhanging said work-support, and stitch-forming and work-feeding mechanisms 35 carried by said frame, of a trimmer mechanism comprising a reciprocatory trimmer-knife actu ating bar mounted in said bracket-arm, an end wise shiftable rock-shaft journaled in said brack et-arm, a crank-arm carried by said rock-shaft 40 adapted to be coupled to and disconnected from said actuating bar, an electric motor mounted upon said frame and having a rotor shaft, a counter-shaft journaled upon said bracket-arm, driving connections between said rotor and coun ter-shafts, a crank-member carried by said 45 counter-shaft, a second crank-arm carried by said rock-shaft, a pitman connection between said crank-member and said second crank-arm providing for endwise movements of said rock shaft, and means for endwise shifting said rock 50 shaft. FREDERIC M. CARD.