Патент USA US2108138код для вставки
Feb. 15, 1938. ' R. s. PAINTER ' , 2,108,138 SEWING AND TRIMMING MACHINE Filed Feb. 27, 1936 4 Sheets-Sheet 1 ‘ Feb. 215, 1938. R. s. PAINTER I 7 2,108,138 SEWING AND TRIMMING MACHINE Filled Feb. 27, 1956 F 2% 2 a2 H 4 Sheets-Sheet 2 1\. \. __ 4. ..)iIii., ®[.:PQ . Z My 2 P _ @ W a, 1T; ‘a wmJ E b .0U .w w v@ 2% aw 2 mvbw _ V9pm .@ \ ® _@ @mu. Mmw #0 Feb» E5, 193%. I R. s. PAINTER SEWING AND TRIMMING MACHINE Filed Feb; 27, 1936 4 Sheets-Sheet 5 Patented Feb. 15, 1938 2,18,138 UNITED STATES PATENT OFFICE 2,108,138 SEWING AND TRIM'M'ING MACHINE‘ Roy Stanley Painter, Hannibal, Mo., assignor to The Singer Manufacturing Company, Elizabeth, N. J ., a corporation of New Jersey Application February 27, 1936, Serial No. 66,012 14 Claims. (Cl. 112-127) This invention relates to improvements in nected by the usual link 9 with a needle-bar H! trimmer mechanisms and more particularly to carrying at its lower end a needle I i, said needle trimmer mechanisms of sewing machines, the in bar i0 being journaled for vertical reciprocation vention having for its primary object to provide a in suitable bearings provided in the bracket-arm sewing machine with an ei?cient and commer head 5. The needle H cooperates, in the forma- 5 cially practical trimmer mechanism adapted to tion of lock-stitches, with the usual loop-taker I2 effect the production of smoothly trimmed and disposed within the frame-post 2. sharply curved edges in work, conjointly with The work is intermittently advanced by a drop the stitching operation. feed mechanism including a feed-bar l3 disposed A more speci?c object of the present invention vertically within the post 2 and carrying at its 10 is to improve the quality of the product obtained upper end a feed-dog M. The feed-dog 14 by the use of sewing machines ?tted for simul operates through a suitably slotted throat-plate taneously stitching the edges and undertrimming l5 secured upon the post 2 and is opposed in its the linings of shoes, etc. rising movement by a presser-roller it closely Another object of this invention is to provide adjacent to and at one side of the path of needle- 1.5 a work~severing trimming machine having a reciprocation. The presser-roller I6 is carried work-feeding mechanism with means for con by the lower end of the usual spring-depressed trolling the relative speeds of operation of the presser-bar ll journaled for vertical movements work-feeding and work-severing mechanisms. in suitable bearings provided in the bracket-arm With the above and other objects in view, as head 20 20 will hereinafter appear, the invention comprises Depending from the under side of the bracket the devices, combinations and arrangements of arm 4 is a frame-boss l8 provided with a flattened parts hereinafter described in connection with lower face affording a seat for a trimmer-bracket the accompanying drawings, in which: l9 ?xedly secured to said boss by screws 20. (0 LI Fig. 1 is a rear side elevation, partly in section, Journaled in suitable bearings provided upon the 25 of a sewing machine provided with the improved trimmer-bracket I9 for endwise reciprocation in trimmer-actuating mechanism. Fig. 2 is a front a vertically inclined path is a knife-bar 2| carry end elevation, partly in section, showing the ing, at its lower end, a knife-holder 22 to which bracket-arm and work-supporting post of the a Work-severing element in the form of a 130 sewing machine. Fig. 3 represents a top plan straight-edge trimmer-knife 23 is secured by 30 view of the sewing machine, with the bracket screws 24. While the cutting edge of the knife arm shown in longitudinal section. Fig. 4 is a is straight, it is preferably inclined downwardly detail view in side elevation of a portion of the in the direction of feed, as illustrated in dotted trimmer-knife actuator bar and its driving stud. lines in Fig. 2 of the drawings. The trimmer Fig. 5 represents a rear side elevation of the knife 23 has a path of movement to sever the 35 sewing machine mounted upon a supporting table Work substantially parallel to the line of seam provided at the under side thereof with a treadle formation and at the side of the needle I l oppo controlled electric-transmitter for driving the site to the presser-roller Hi. The movement of sewing machine, certain parts of the sewing ma the trimmer-knife in a vertically inclined path 40 chine being omitted. transverse to the plane of the work results in the 40 Referring to the drawings, the present inven production of undercut trimmed edges and, ac tion is illustrated as embodied in. the commer cordingly, in the trimming of shoe linings the cially well known Singer No. 51W56 sewing and trimmed edge of the lining is concealed by the underedge-trimming machine. This sewing ma beveled edge of the shoe-upper, as is well under 45 chine has a frame comprising a, bed-plate I, stood in the art. 45 from one end of which rises a work-supporting post 2. Upon the opposite end of the bed-plate I is the supporting standard 3 of a bracket-arm 4 which terminates at its free end in a head 5 over hanging the work-supporting post 2. Journaled in the bracket-arm 4 is a horizon tally disposed main actuating shaft 6 carrying at one end a combined belt-pulley and balance wheel ‘I. At its opposite end, the main shaft 6 is 5;, provided with a crank-disk 8 operatively con As heretofore constructed, the underedge cut ting trimmer-knife has usually been actuated from the main shaft of the sewing machine to reciprocate once for each needle reciprocation. When stitching and trimming in sharp curves, 50 occurring particularly in shoe production, the work is not only advanced by the feeding mecha nism of the machine but is also sharply turned by the operator between successive reciprocations Of the trimmer-knife, according to the desired 55 2 2,108,138 work-edge outline. As a consequence, successive straight cuts made by the trimmer-knife intersect each other at an angle and the trimmed edge of the work presents an objectionable appearance. It has been heretofore proposed to overcome this dif?culty by reciprocating the trimmer-knife twice for each needle-reciprocation, by the pro vision of suitable actuating connections with the main shaft of the machine, but this proposal has 20 N) Cal 30 motor 49. The eccentric 41 is elongated to pro vide for the requisite sliding movement of the fork of the rock~arm ‘25 upon said eccentric when the rock-shaft 33 is shifted endwise to dis connect the coupling pin (it from the actuator bar 28. The electric-motor 48 is disposed so that its rotor~shaft is substantially parallel to and pref erably at substantially the same level as the main shaft 5 of the sewing machine, said electric ll) proven unsatisfactory for several reasons and particularly because of the lack of durability of motor being mounted upon a suitable bracket 59 the trimmer mechanism when operated at twice ' secured by screws 5!. upon the rearward side of the frequency of the needle reciprocations at the ' the machine bracket-arm (l. The electric-motor higher speeds of operation of the sewing machine. has the usual current-controlling switch 52 and derives its power from suitable source, The present invention obviates the diiiiculties in through current leads 53, so that the electric herent in the prior known arrangements in a motor may be operated independently of the op simple and novel manner, eration of the sewing machine. A guard-bracket Suitably secured upon the knife-bar 21 is a 54 houses the eccentric 4i and the forked end of collar 25 pivot-ally connected by a link 28 to an the rock-arm llli, said guard-bracket having a arm 2? of a bracket rigidly carried by the lower supporting shank 55 secured by screws, as 5'5, end of an actuator bar 28. The actuator bar 23 upon the ?attened upper face of the bearing-lug is con?ned to vertical reciprocation in suitable guide-slots 29 provided in the bracket-arm head 31% which is adjacent to the rock-arm 46. The sewing machine is preferably mounted 5, said bar 28 having in its outer edge a notch 36 adapted to receive a coupling-pin. 3!. The upon a supporting table at the under side of coupling-pin 3! is carried by the free end of a which is disposed sewing machine driving means crank~arm extending horizontally forward of any usual or suitable character. As illustrated in Fig. 5 of the drawings, this sewing machine from one end of a rock-shaft 33 disposed sub driving means may comprise an electric-trans stantially parallel to the main shaft 5, said rock mitter having a supporting frame 5'! suitably 30 shaft 33 being journaled for rocking and end secured to the under side of the machine-sup wise movements in bearing-lugs 3ft upon the machine bracket-arm, at the rearward side porting table 58. Carried by said frame 51 is an electric motor 59 having a rotor-shaft 60 upon thereof. At its end opposite to the crank-arm 32, the which is secured a driving clutch-member 6| for rotation therewith. Adapted to frictionally en rock-shaft 33 has a circumferential groove 35 gage the driving clutch member 6| is a driven embraced by a suitably notched car 36 upon one arm 31' of angular hand-lever 3?, 38. The clutch-member 52 which is peripherally grooved hand-lever 3'1, 38 is pivotally mounted upon a to form a belt-pulley connected by a belt 63 with horizontally disposed fulcrum-screw 39 extending the pulley ‘i of the sewing machine. The driven transversely of the main shaft 6 and threaded clutch-member 62 may be shifted endwise of the 40 rotor-shaft 69, into frictional engagement with into a boss llil upon the machine bracket-arm G. The arm 3? of the hand-lever depends below the the driving clutch-member 6!, by a lever 64 piv bracket-arm 4 so as to be conveniently accessible otally mounted upon an arm 65 extending from from the front side of the machine, while the the transmitter-frame 5?. The lever 64 is con nected by an adjustable rod 66 to a suitable arm 38 of said lever is acted upon by a spring 4! to yieldingly shift the rock-shaft 33 in a direction treadle 81. By operation of the treadle 61, the to effect driving engagement by the coupling pin lever Gil may be actuated against the action of a 3i with the actuator bar 28. A coil-spring £52 has spring 68 to bring the clutch~member 62 into its opposite ends connected to the bracket-arm I3 frictional engagement with the clutch-member and to the knife-bar 2i to retract said knife-bar 6!, thereby to drive the sewing machine. The, speed of operation of the sewing machine may, and thereby to raise the actuator-bar 28 into in operative positions of said bars, when the hand lever 3'5, 33 is operated to disconnect the cou pling-pin 3i from the actuator-bar 28. Pivctally mounted upon the trimmer-bracket i9 is a hand-lever as which is yieldingly held in inoperative position by a spring M. The upper end of this lever 153 has a lateral extension 155 adapted, upon operation of said lever, to engage the upper end of the knife-bar 2i and to depress said knife-bar against the action of the spring 42. Being connected to the knife-bar M, the actuator-bar 23 is likewise depressed by opera tion of the hand-lever 43, until the notch 39 of the bar 28 is in alinement with the coupling-pin 3|, whereupon said coupling-pin enters the notch 39 under the influence of the spring 4|. It will, therefore, be understood that the trimmer-knife carrying bar I?! may be connected to and discon ' nected from the rock-shaft 33 at the will of the operator during the operation of the machine. Extending rearwardly from the rock-shaft 33’ and rigidly secured thereto is a rock~arm 136 having a forked free end embracing an eccentric . 4‘! carried by the rotor-shaft 4-8 of an electric of course, be varied by permitting slippage be tween said clutch-members. It is to be under stood, however, that the present invention is not limited to the speci?c form of sewing machine driving means described, as any other suitable speed-controlling power transmitting device may be employed. From the foregoing description, it will be under stood that when the electricemotor L19 is in opera tion, the rock-shaft 3;’; derives rocking movements from the eccentric All carried by the rotor-shaft d8 of the electric-motor. Upon operation of the hand-lever 5-3, the actuator~bar 28 is coupled to the crank-arm of said rock-shaft, thereby transmitting reciprocatory movements to the knife-bar 2i which may, at will, be disconnected from its actuating mechanism by manipulation of the hand-lever 3?, 38. The rotor-shaft d8 of the electric-motor $19 ro tates at a substantially constant speed, prefer~ ably at least equal to the maximum speed of rota tion of the main shaft 6 of the sewing machine. Therefore, when the sewing machine is operated at maximum speed and the motor 559 is running, 2,108,138 3 the trimmer-knife 23 reciprocates once for each needle reciprocation. However, it is only in sub reciprocated from said shaft, of a trimmer mech anism comprising a reciprocatory trimmer-ele stantially straight line stitching that the sewing ‘ment having effective work-severing movements machine is operated at maximum speed. As the adjacent said needle, a rotary actuating shaft dis Cir work is not sharply turned during substantially posed substantially parallel to and rotatable in straight stitching operations, the successive straight cuts performed by the trimmer-knife 23 are in alinement or so nearly in alinement that the trimmed edge of the work presents a smooth 10 appearance. On the other hand, the stitching of sharp curves is necessarily performed at slow speeds of opera tion of the sewing machine and, at such slower speeds, the trimmer-knife of the present invention continues to operate at the same speed as before. For example, if the trimmer-knife performs 2800 reciprocaticns per minute and the sewing machine is operated at a speed of 400 stitches per minute, the trimmer-knife will have seven work-severing 20 strokes for each needle reciprocation. Conse quently, when the work is sharply turned by the operator at the slower speeds of operation of the sewing machine, the intersections of successive cuts performed by the trimmer-knife approach each other so closely that smooth trimming is maintained. The present improvement therefore provides means for actuating the stitch-forming and trimming mechanisms at speeds having a ratio variable at will during the operation of the 30 machine. Sewing machines of the present type are often used merely for stitching operations and, for this purpose, it has heretofore been the usual practice to throw the trimmer-knife out of operation by means of the hand-lever 3'5, 38, leaving in opera tion the portion of the trimmer mechanism in cluding the actuating eccentric and the fork em braced thereby. While the present arrangement includes this trimmer throw-out expedient, it 40 need only be used when changing frequently from trimming to non-trimming operations. For any extended periods of operation of the sewing ma chine during which the trimming mechanism is not used, the operation of the electric-motor 49 45 may be discontinued, thereby minimizing wear of the eccentric it‘! and the fork of the rock-arm 46 embracing said eccentric. If the sewing machine needle is omitted, the machine is adapted for trimming purposes alone. In this case, the speed of effective action of the feeding mechanism of the machine may likewise be varied at will relative to the frequency of re ciprocation of the trimmer-knife, to provide for smoothly severing sharply curved work by means of a machine adapted to trim straight runs at high dependently of said needle-reciprocating shaft, and operative connections with said actuating shaft for reciprocating said trimmer-element. 3. The combination with a sewing machine hav ing a work-support, stitch-forming mechanism 10 including a reciprocatory needle and work-feeding mechanism, of a trimmer mechanism including a trimmer-element having Work-severing move ments adjacent said needle in a path inclined vertically to said work-support, and means oper able independently of said stitch-forming and Work-feeding mechanism for reciprocating said trimmer-element. 4. In a sewing machine, the combination with simultaneously operable stitch-forming and Work-trimming mechanisms, of means for actu ating said mechanisms at relative speeds having ratio variable at will during the operation of said machine, and means operable at will during the operation of the machine for interrupting the effective action of said work-trimming mech anism. 5. The combination with a sewing machine having a reciprocatory needle and needle-recip rocating mechanism, of a trimmer mechanism including a trimmer-element having effective work~severing movements adjacent said needle, means operable independently of said needle-re ciprocating mechanism for actuating said trim mer mechanism, and means operable at will dur ing the operation of the machine for substan tially instantaneously interrupting the effective action of said trimmer mechanism. 6. In a sewing machine, the combination with simultaneously operable stitch-forming and work-severing movements adjacent said needle, an electric motor operable independently of said needle-reciprocating mechanism, and operative connections with said electric motor for recip speed. rocating said knife. As illustrated in the accompanying drawings, the trimmer mechanism assembly includes the usual edge-guide and adjusting devices, which 8. The combination with a sewing machine having a needle-reciprocating mechanism, of a 60 are, however, not herein referred to in detail, as a description thereof is considered unessential to an understanding of the present invention. Having thus set forth the nature of the inven tion, what I claim herein is:— 1. The combination with a sewing machine hav ing a reciprocatory needle and needle-reciprocat ing mechanism, of a trimmer mechanism includ ing a reciprocatory knife having effective work severing movements adjacent said needle, and means operable independently of said needle-re ciprocating mechanism for reciprocating said knife. 2. The combination with a sewing machine having stitch-forming mechanism including a 75 rotary needle-reciprocating shaft and a needle 40 work-trimming mechanisms, of means for actu ating said mechanisms at relative speeds having a ratio variable at will during the operation of said machine, and means operable at will dur ing the operation of the machine for throwing 45 said work-trimming mechanism out of and into effective action. 7. The combination with a sewing machine having a reciprocatory needle and needle-recip rocating mechanism, of a trimmer mechanism including a reciprocatory knife having effective reciprocatory trimmer-element,_an electric m0 tor having a rotor-shaft operable independently 60 of said needle-reciprocating mechanism, an ec centric carried by said rotor-shaft, and actuating connections for reciprocating said trimmer-ele ment from said eccentric. 9. The combination with a sewing machine 65 having a frame and a needle-reciprocating mech anism mounted upon said frame, of a recipro catory trimmer-knife carrier mounted upon said frame, an electric motor mounted upon said frame and operable independently of said needle 70 reciprocating mechanism, and operative connec tions with said electric motor for reciprocating said trimmer-knife. 10. The combination with a sewing machine having stitch-forming mechanism including a 75 2,108,138 rotary needle-reciprocating shaft and a needle reciprocated from said shaft, of a trimmer mech anism comprising a reciprocatory trimmer-ele Cl 10 ment having effective work-severing movements adjacent said needle, an electric motor having a rotor shaft disposed substantially parallel to and operable independently of said needle-recip rocating shaft, and means for reciprocating said element from said rotor-shaft. 11. The combination with a sewing machine having a reciprocatory needle and needle-recip rocating mechanism, of a trimmer mechanism including a trimmer-element having effective work-severing movements adjacent said needle, 15 an electric motor operable independently of said needle-reciprocating mechanism, operative con nections with said electric motor for actuating said trimmer mechanism, and means operable at will during the operation of said electric motor for substantially instantaneously interrupting the effective action of said operative connections. 12. The combination with a sewing machine having a frame including a work-support and a bracket-arm overhanging said work-support, 25 a rotary needle-reciprocating shaft journaled in said bracket-arm, a vertically reciprocatory nee dle actuated from said shaft, and work-feeding mechanism, of a trimmer mechanism supported by said bracket-arm and comprising a recipro catory trimmer-element having a work-severing path of movement adjacent to and inclined ver tically to the path of needle reciprocation, an electric motor operable independently of and having a rotor-shaft disposed substantially par allel to said needle-reciprocating shaft, a rock shaft, means for imparting rocking movements to said rock-shaft from said rotor-shaft, and means connected to said rock-shaft and discon~ nect-ible therefrom at will during the operation of the machine for reciprocating said trimmer element. 13. In a sewing machine, in combination, a reciprocatory needle and a reciprocatory work~ severing trimmer-element adapted to be oper 15 ated at a variable ratio of reciprocation-fre quencies, means for reciprocating said needle, means for reciprocating said trimmer-element, and means for varying said ratio comprising con trolling means for operating said sewing machine at di?erent speeds. 14. The combination with a sewing machine having a reciprocatory needle, of a trimming mechanism including a reciprocatory work-sev ering element, variable-speed driving means for 25 controlling the frequency of reciprocation of said needle, and substantially constant-speed driving means for reciprocating said element. ROY STANLEY PAINTER.