Патент USA US2108139код для вставки
Feb. 15, 1938. R. s. PAINTER 2,108,139 TRIMMING‘ MACHINE Original Filed Feb. 27, 1956 4 Sheets-Sheet l 27 :1_\\ 35 5 I I I V Feb. 15, 1938. ‘R. ‘s. ‘PAINTER. ' 2,108,139 TR IMMING MACHINE original; Filed Feb. 27, 1936 2929' 4 Sheets-Sheet 2 10a (Iniet Feb. 15, 1938. R. s. PAINTER 2,108,139 TRIMMING MACHINE Original Filed- Feb. 27, 1936 5.9 ' mm” 63 ‘ 14.;ii? i 4 Sheets-Sheet 4 ZdttdSt Patented Feb. 15, 1938 UNITED STATES PATENT OFFICE 2,108,139 TRIMMING MACHINE Roy Stanley Painter, Hannibal, Mo., assignor to The Singer Manufacturing Company, Elizabeth, N. J., a corporation of New Jersey Original application February 27, 1936, Serial No. 66,012. Divided and this application October 20, 1936, Serial No. 106,524 9 Claims. (CI. 12-51) 5 the main shaft 6 in any usual or suitable man ner, and preferably so that the feed-dog 9 has one effective work-advancing movement for each sharply curved work-edges. rotation of the main-shaft 6. As feeding mech Another object of this invention is to provide a trimming machine, having a work-feeding mechanism, with means for controlling the rel ative speeds of operation of the work-feeding and 10 work-severing mechanisms. With the above and other objects in view, as will hereinafter appear, the invention resides in the trimming and work-feeding mechanisms hereinafter described in connection with the ac companying drawings, in, which: Fig. 1 is a rear side elevation, partly in section, of a machine provided with the improved trim mer-actuating mechanism. Fig. 2 is a front end elevation, partly in section, showing the bracket 20 arm and work-supporting post of the machine. Fig. 3 represents a top plan view of the ma chine, with the bracket-arm shown in longitudi— nal section. Fig. 4 is a detail view in side ele— vation of a portion of the trimmer-knife actu ator bar and its driving stud. Fig. 5 represents a rear side elevation of the machine mounted upon a supporting table provided at the under side thereof with a treadle-controlled electric~ 30 dog 9. The feed-bar 8 derives its actuation from This invention relates to improvements in trimming machines and has for its primary ob ject to provide a machine particularly adapted to eifect the production of smoothly severed and transmitter for driving the machine, certain parts of the machine being omitted. As described in my copending patent appli cation Serial No. 66,012, ?led Feb. 27, 1936, of which this application is a division, the present invention is illustrated in the drawings as em CR anisms of this character are old and well known in the sewing machine art, it has been deemed unessential to an understanding of the present invention to illustrate and describe any speci?c 10 form of feed-dog actuating mechanism. The feed-dog 9 operates through a suitably slotted throat-plate H! secured upon the upper end of the post 2 and is opposed in its work-en gaging movement by a presser-roller H. The presser-roller H is carried by the lower end of the usual spring-depressed p-resser-bar l2 jour naled for vertical movements in suitable bear ings provided in the bracket-arm head 5. Depending ‘from the under side of the bracket arm 4 is a frame-boss l3 provided with a ?at tened lower face affording a seat for a trimmer 20 bracket I6 ?xedly secured to said boss by screws I5. J ournaled in suitable bearings provided upon the trimmer-bracket i 4 for endwise reciprocation in a vertically inclined path is a knife~bar 55 carrying, at its lower end, a knife-holder H to 5 which a work-severing element in the form of a straight-edge trimmer-knife I8 is secured by screws I9. While the cutting edge of the knife is straight, it is preferably inclined downwardly 30 in the direction of feed, as illustrated in dotted lines in Fig. 2 of the drawings, the trimmer knife I8 having a path of movement to sever the work substantially parallel to the line of feed. C23 Or bodied in a sewing machine to provide a combined The movement of the trimmer-knife in a verti ance with the present invention, the thread han dling mechanisms of the sewing machine may be 40 omitted and that the machine may be employed the work results in the production of undercut trimmed edges and, accordingly, in the trimming of shoe linings the trimmed edge of the lining is concealed by the beveled edge of the shoe-up 40 per, as is well understood in the art. As heretofore constructed, the underedge cut stitching and underedge-trimming machine. However, it is to be understood that, in accord solely for trimming purposes. Referring to the drawings, the machine has a frame comprising a bed-plate I, from one end of which rises a work-supporting post 2. Upon the opposite end of the bed-plate is the supporting standard 3 of a bracket-arm 4 which terminates at its free end in a head 5 overhang ing the work-supporting post 2. Journaled in the bracket-arm 4 is a horizontally disposed main actuating shaft 6 carrying at one end a combined belt-pulley and balance-wheel l. The work to be trimmed is preferably inter mittently advanced by a drop-feed mechanism including a feed-bar 8 disposed vertically within 55 the post 2 and carrying at its upper end a feed_— cally inclined path transverse to the plane of 35 ting trimmer-knife has usually been actuated from the main shaft of the sewing machine to reciprocate once for each needle reciprocation. When trimming in sharp curves, occurring par ticularly in shoe production, the work is not only advanced by the feeding mechanism of the machine but is also sharply turned by the op erator between successive reciprocations of the trimmer-knife, according to the desired work edge outline. As a consequence, successive straight cuts made by the trimmer-knife inter sect each other at an angle and the trimmed edge of the work presents an objectionable ap 55 2 2,108,139 pearance. It has been heretofore proposed to overcome this difliculty by reciprocating the trim mer-knife twice foreach rotation of the main shaft of the machine, but this proposal has proven unsatisfactory for several reasons and particu larly because of the lack of durability of the trimmer mechanism when operated at the higher speeds of operation of the machine. The present invention obviates the di?iculties inherent in the 10 prior known arrangements in a simple and novel manner. Suitably secured upon the knife-bar i5 is a collar 20 pivotally connected by a link 25 to an arm 22 of a bracket rigidly carried by the lower end of an actuator bar 23. The actuator bar 2-3 is con?ned to vertical reciprocation in suitable guide-slots 24 provided in the bracket-arm head 5, said bar 23 having in its outer edge a. notch 25 adapted to receive a coupling-pin 26. The cou pling-pin 26 is carried by the free end of a crank arm 2? extending horizontally forward from one end of a rock-shaft 28 disposed substantially parallel to the main shaft 6, said rock-shaft 28 being journaled for rocking and endwise move ments in bearing-lugs 29 upon the machine bracket-arm, at the rearward side thereof. At its end opposite to the crank-arm 2?, the rock-shaft 28 has a circumferential groove 3i) em braced by a suitably notched ear 3| upon one 30 arm 3'2 of an angular hand-lever 32, 33. The hand-lever 32, 33 is pivotally mounted upon a horizontally disposed fulcrum-screw 34 extend ing transversely of the main shaft 5 and threaded into a boss 35 upon the machine bracket-arm 4. The arm 32 of the hand-lever depends below the bracket-arm 4 so as to be conveniently accessible from the front side of the machine, while the arm 33 of said lever is acted upon by a spring 36 to yieldingly shift the rock-shaft 28 in'a direction to 40 effect driving engagement by the coupling pin 25 with the actuator bar 23. A coil-spring 31 has its opposite ends connected to the bracket-arm A and to the knife-bar Hi to retract said knife-bar and thereby to raise the actuator-bar 23 into in 45 operative positions of said bars, when the hand lever 32, 33 is operated to disconnect the cou pling-pin 26 from the actuator-bar 23. Pivotally mounted upon the: trimmer-bracket I4 is a hand-lever 38 which is yieldingly held in inoperative position by a spring 39. The upper end of this lever 38 has a lateral extension 130 adapted, upon operation of said lever, to engage the upper end of the knife-bar t5 and to depress said knife-bar against the action of the spring 3i’. Being connected to the knife-bar !6, the ac tuator-bar 23 is likewise depressed by operation of the hand-lever 33, until the notch 25 of the bar 23 is in alinement with the coupling-pin 25, whereupon said coupling~pin enters the notch 25 under the influence of the spring 36. It will, therefore, be understood that the trimmer-knife carrying bar it may be connected to and dis connected from the rock-shaft 23 at the will of the operator during the operation of the ma chine. Extending rearwardly from the rock-shaft 22 and rigidly secured thereto is a rock-arm 4! hav ing a forked free end embracing an eccentric I32 carried by the rotor-shaft d3 of an electric-motor 44. The eccentric 132 is elongated to provide for the requisite sliding movement of the fork of the rock-arm 13! upon said eccentric when the rock shaft 28 is shifted end-wise to disconnect the cou pling pin 2% from the actuator-bar 23. The electric-motor lid is disposed so that its 75 rotor-shaft is substantially parallel to and pref erably at substantially the same level as the main shaft 6 of the machine, said electric-motor being mounted upon a suitable bracket 45 secured by screws 46 upon the rearward side of the machine CI bracket-arm 4. The electric-motor has the usual current-controlling switch Li? and derives its power from any suitable source, through current leads 48, so that the electric-motor may be op erated independently of the operation of the ma 10 chine feeding mechanism. A guard-bracket 49 houses the eccentric ‘i2 and the forked end of the rock-arm it, said guard-bracket having a supporting shank 58 secured by screws, as 5i, upon the flattened upper face of the bearing-lug 29 which is adjacent to the rock-arm 4!. The trimming machine is preferably mounted upon a supporting table at the under side of which is disposed trimming machine driving means of any usual or suitable character. As illustrated in 20 Fig. 5 of the drawings, this driving means may comprise an electric-transmitter having a sup porting frame 52 suitably secured to the under side of the machine-supporting table 53. Carried by said frame 5.2 is an electric motor 5*‘; having 25 a rotor-shaft 55 upon which is secured a driv ing clutch-member 5'6 for rotation therewith. Adapted to frictionally engage the driving clutch member 55 is a driven clutch-member 5'! which is peripherally grooved to form a belt-pulley con 30 nected by a belt 58 with the pulley ? or" the trim ming machine. The driven clutch-member 51 may be shifted endwise of the rotor-shaft 55, in to frictional engagement with the driving clutch member 56, by a lever 59 pivotally mounted up on an arm 63 extending from the transmitter frame 52. The lever 59 is connected by an ad iustable rod 6| to a suitable treadle 62. By oper ation of the treadle 62, the lever 59 may be actu ated against the action of a spring 83 to bring 40 the clutch-member 5'! into frictional engagement with the clutch-member 5'6, thereby to drive the trimming machine. The speed of operation of the trimming machine may, of course, be varied by permitting slippage between said clutch-mem bers. It is to be understood, however, that the present invention is not limited to the speci?c form of trimming machine driving means de scribed, as any other suitable speed-controlling 50 power-transmitting device may be employed. From the foregoing description, it will be un derstood that when the electric-motor M is in operation, the rock-shaft 2B derives rocking movements from the eccentric I32 carried by the rotor-shaft 43 of the electric-motor. Upon op 55 eration of the hand-lever 33, the actuator-bar 23 is coupled to the crank-arm 2'! of said rock-shaft, thereby transmitting reciprocatory movements to the knife-bar l6 which may, at will, be discon nected from its actuating mechanism by manip ulation of the hand-lever 32, 33. The rotor-shaft d3 of the electric-motor 134 rotates at a substantially constant speed, pref erably at least equal to the maximum speed of rotation of the main shaft 6 of the trimming ma chine. Therefore, when the trimming machine is operated at maximum speed and the motor 124 is running, the trimmer-knife l8 reciprocates once for each work-advancing movement of the feed 70 dog 55. However, it is only in substantially straight line trimming that the machine is operated at higher speeds and that the successive straight cut-s performed by the trimmer-knife l? are in alinement or so nearly in alinement that the 75 2,108,139 trimmed edge of the work presents a smooth appearance. On the other hand, the trimming of sharp curves is necessarily performed at slow speeds of operation of the machine and, at such slower speeds, the trimmer-knife of the present inven tion continues to operate at the same speed as before. For example, if the trimmer-knife per forms 2800 reciprocations per minute and the machine is operated at a speed of 400 revolutions per minute of the main shaft 6, the trimmer knifewill have seven work-severing strokes for each feeding movement. Consequently, when the work is sharply turned by the operator at the slower speeds of operation of the machine, the intersections of successive cuts performed by the trimmer-knife approach each other so closely that smooth trimming is maintained. The pres ent improvement therefore provides means for actuating the trimming mechanism: at speeds having a ratio variable at will during the opera tion of the machine. As illustrated in the accompanying drawings, the trimmer mechanism assembly includes the usual edge-guide and adjusting devices, which 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. In a trimming machine, the combination 3 substantially parallel to the line of feed, means for varying the speed of operation of said feed ing mechanism relative to the frequency of re ciprocation of said trimmer-element without stopping the machine, and means operable at will during the operation of the machine for in terrupting the effective action of said trimmer element. . 5. In a trimming machine, the combination with a work-support and mechanism for feeding 10 sheet-material Work in the plane thereof, of trimming means including a reciprocatory trim mer-element having a Work-severing cutting edge substantially parallel to the line of feed, means for varying the speed of operation of said feeding mechanism relative to the frequency of reciprocation of said trimmer-element without stopping the machine, and means operable at will during the operation of the machine for throwing said work-trimming mechanism out of and into effective action. 6. The combination with a trimming machine having a work-feeding mechanism including a feed-dog, of a trimmer mechanism including a reciprocatory knife having effective work-sever ing movements adjacent said feed-dog, said knife having its cutting edge substantially parallel to the line of feed, an electric motor operable in dependently of said work-feeding mechanism, with means for supporting and marginally feed ing sheet material work in the plane thereof, of trimming means including a reciprocatory ply and operative connections with said electric mo 30 tor for reciprocating said knife. 7. The combination with a trimming machine having a work-feeding mechanism, of a recipro catory trimmer-element having a work-severing ting edge substantially parallel to the line of feed, an electric motor having a rotor-shaft op trimming element having a work-severing cut- ‘ cutting edge substantially parallel to the line of 1 feed, and means to vary the work-advancing speed of the feeding means relative to the fre quency of reciprocation of the trimming-element without stopping the machine. 2. A trimming machine having a frame includ ing an upstanding work-supporting post and a bracket-arm overhanging said post, a work-feed ing mechanism including a feed-dog operating through the free end of said post, a trimmer mechanism supported by said bracket-arm and including a reciprocatory trimmer-element hav ing effective work-severing movements adjacent said feed-dog, and means operable independently of said feeding mechanism for actuating said trimmer mechanism. 3. A trimming machine having a frame includ ing a work-support and a bracket~arm over hanging said work-support, a work-feeding mechanism, a trimmer mechanism supported by said bracket-arm and including a reciprocatory trimmer-element having a work-severing path of movement inclined vertically to said work-sup port, said trimmer element having its cutting 60 edge substantially parallel to the line of feed, and means to Vary at will the relative speed ratio of said work-feeding and trimmer mechanisms dur ing the operation of the machine. 4. In a trimming machine, the combination with a work-support and mechanism for feeding sheet-material work in the plane thereof, of trim ming means including a reciprocatory trimmer element having a work-severing cutting edge erable independently of said work-feeding mech anism, an eccentric carried by said rotor-shaft, and actuating connections for reciprocating said 40 trimmer-knife from said eccentric. 8. The combination with a trimming machine having a frame including a work-support and a bracket-arm overhanging said work-support, a rotary actuating shaft journaled in said brack et-arm, and a work-feeding mechanism actuated - from said shaft, of a trimmer mechanism sup ported by said bracket-arm and comprising a re ciprocatory trimmer-element having a. work severing path of‘ movement inclined to said work-support, an electric motor operable inde pendently of and having a rotor-shaft disposed substantially parallel to said actuating shaft, a rock-shaft, means for imparting rocking move ments to said rock-shaft from said rotor-shaft, and means connected to said rock-shaft and dis connectible therefrom at will during the opera tion of the machine for reciprocating said trim me-r-element. 9. In a trimming machine, in combination, a work-advancing feed-dog and a reciprocatory 60 trimmer-element operable at a variable ratio of relative frequencies, means for actuating said feed-dog, means for reciprocating said trimmer element, and means for varying said ratio com prising controlling means for operating said feed-dog at different speeds. ROY STANLEY PAINTER.