US1498650A - Sewing machine - Google Patents

Description

afimmre 2 B924,

H. 0. FLETC ER SEWING MACHINE L E 1 m N u TW m u, N m E n 3 mm A s I m e & J m 6, R I

Filed Nov. 21,

June 24, 1924. 1,498,650

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- H.O.FLETCHER .SEWING MACHINE Filed Nov. 21, 1919 16 Sheets-Sheet l6 WITNESSES:

INVENTOR HENRY O.FLETGHER ATTORNEY Patented June 24, 1924,

UNITED STATES PATENT OFFICE.

HENRY O. FLETCHER, QIE BRIDGEIQBT. CONNECTICUT, .FiSSIGNOR 130 THE SINGER MANUFACTURING coiaranr. or at.

CORPORATION- OF SEWING MACHINE.

Application filed. November 21,

To all whom it may concern Be it known that I, HENRY O. FL CHER, a citizen of the United ritates, residing at Bridgeport in the county of Fair-field and tltate of Connecticut, have invented certain new and useful Improvements in Sewing Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to sewing machines being more particularly designed for lock stitch outsole or rapid stitchers for sewing shoes. and provides for improvements in the various sewing instrumentalities and combinations 01? such instrumentalities with each other in novel relationships to produce so perior results.

A novel awl actuating mechanism is provided, the awl being driven by a cam on the main cam shaft, the operating connections for giving the piercing and retracting movement to the awl including improved means for allowing for. the feed motion which is produced by a different cam path on the same cam disc.

Means is also provided by which the feed may be varied from a point convenient to the operator, this means requiring but slight movement to produce the desired adjustment, thus making it unnecessary for the operator to remove his hand from the shoe for any considerable time during the stitching perat It is also desirable to provide for initially positioning the awl with respect to the needle and other stitch forming instrumentali; ties in setting up the machine or for insert ing a new awl or needle, and the present invention provides means whereby the initial position of the awl may be very accurately adjusted and in a very simple and expeditious manner.

The present invention providesalso for positively pulling off the thread from the wax pot whereby .the thread measurer is released from; this duty. This construction causes the tension of the thread pulled ofi by the thread n'ieasurer to be controlled err tirely by the tension device without superposing thereon as has heretofore been the case. tension due to the wax stripper gland of the wax pot which is of variable amount being modified by frequent settings by the operator according to the condition of the thread and wax. This enables the tension to fierial No. 339,637.

be held uniform regardless of variations in the adjustments of any part beside the tension device.

A. looper mechanism deriving its entire motion from a single double throw cam groove is also provided, the looper being caused to lay the loop in the thread finger and the barb of the needle and thereafter to take a position with its eye in line with the thread as it is drawn up by the needle and shuttle hook and thereafter pulled down by the take-up. to prevent reeving of the thread thereover. The looper mechanism is readily removable and when in position is counterbalanced to hold it in osition and to reduce wear between the cam and its fol= lower.

A. novel means of driving the shuttle is provided together with improved means for insuring the engagement of the shuttle hook with the loop and the removal of the latter from the needle. This latter means entirely removes the loop from the needle in spread condition and thereafter moves the loop bodily out oi the path of the needle and into the path of the shuttle hook. thus insuring positive and certain action. A resilient element in the shuttle drive also provides against any sudden erking on the thread as the shuttle hook engages the loop. The shuttle and drive mechanism. together with the thread transfer for removing the loop from the needle and presenting it to the shuttle. are held in cooperative relation by a casing and may be assembled and disassembled as a unit with relation to other parts of the machine.

Improvements also reside in the presser foot, the take-up. and the thread look. A novel. thread men surer is also provided, which has provision by which the position of the locking of the upper and lower threads in the work may be adjusted, and which. also measures of? thread in accordance with the thickness of the work being sewed.

Another novel feature of the invention comprises a stop motion by which the sewing instrumentalities are arrested at a deter mined point in. their cycle of operations, and thereafter the presser foot is raised and the thread lock opened by power to facilitate removal of the work from the machine.

A selective sliding gear transmission is also provided which may be interposed in the machine drive at will and by which its ill speed is reduced to anyone of a plurality of speeds each lower than the normal speed to facilitate sewing about the toe of a shoe.

g A preliminary depression of a treadle serves and combinations of parts will appear from a description of one embodiment of the invention illustrated in the accompanying drawings in which,-

Fig. 1 is a front elevation partly in sec tion of the upper portion of the machine;

Fig. 2 is a top plan thereof;

Fig. 3 is a rear elevation;

Fig. 4 is a left hand elevation, the hand wheel being removed and the main shaft shown in section;

Fig. 5 is a detail elevation of a portion of the needle and awl mechanism;

' Fig. 6 is a detail section of a smaller portion of the same mechanism;

' Fig. '7 is a side elevation of the same;

Figs. 8 and 9 are detail views of a portion of the awl actuating mechanism;

Fig. 10 is a longitudinal vertical section through the shuttle drive casing;

Fig. 11 is a plan of the mechanism therein, the casing being removed;

Fig. 12 is a fragmentary view showing the shuttle drive member and the thread transferrer in front elevation;

Fig. 13 is a sectional view taken substantially on the line 13-13 of Fig. 11;

Fig. 14 is a disassembled perspective of a portion of the shuttle drive mechanism;

Figs. 15 to Y 19 are diagrammatic views showing various relative positions of the needle, shuttle hook, and thread transferrer;

Fig. 20 is a section through the looper cam and looper on line 2020 of Fig. 21:

Fig. 21 is an elevation of the same parts;

Figs. 22 and 23 are diagrammatic views showing the action of the looper with relation to the thread finger andneedle;

Fig. 24 is a detail front elevation of the presser foot mechanism;

Fig. 25 is a side elevation of the same;

Fig. 26 is a fragmentary cross section of a portion of this mechanism;

Fig. 27 is a rear elevation of the same portion;

Fig. 28 is a top plan of the presser foot mechanism;

Fig. 29 is a side elevation of the same, with parts in section and parts removed;

Fig. 30 is a detail plan partly in section of a portion of a thread lock and threadmeasurer mechanism;

Fig. 31 is a fragmentary view of the thread measurer and take-up in one position;

Fig. 32 is a more complete view showing these and certain other instrumentalities in a dii'ferent position;

Fig. 33 is a longitudinal section through the stop mechanism; I

Fig. 34 is a cross section on line 34-34 of Fig. 33;

Fig. 35 is a detail partly in section of a' portion of the same mechanism;

Fig. 36 is a cross section on line 36-36 of Fig. 33;

Fig. 37 is a cross section on line 3737 of Fig. 33; V

Fig. 38 is an end elevation of the stop mechanism F lg. 39 is a partial cross section on the perspective of Fig. 46 is a longitudinal cross section through the speed-reducing mechanism on' line 46-46 of Fig. 48:

F 47 is a detail of a cam mechanism: Fig. 48 is a horizontal section through the machine base showing some of the drive mechanism in plan;

F 49 is a cross section through the speed-reducing mechanism along the line 49--49 of Fig. 46; and

Fig. 50 is a cross section along the line 5l')--50 of Fig. 46. I

il ecdle and awl motion.

Z indicates the usual machine head having a cam shaft S mounted for rotationtherein and suitably driven and having the usual hand wheel D on one end. This cam shaft has fixed thereon a series of cam discs A B and C. Extending at the right hand side of the machine head is a bracket member F. YVithin this bracket member is mounted a slide H adapted for movement transversely of the machine said slide having at its left extremity an upwardly extending post T.

Extending from the head Z is a bracket K. said bracket K and the post T having their free extremities provided with aligned openings in which are mounted oppositely di-.

rected studs W and K, respectively (see Figs. 5 and 6). Upon the stud W is mounted the needle sector 4 carrying a hook needle P of the usual form and also serving as a support for the needle guide Pi. Upon the stud X is pivotally mounted the awl sector carrying the awl O. The stud X is hollow and provides a guide opening for a pin W projecting iron: the stud W whereby the awl and needle sector are kept in proper alignn ent at all times, the parts being so arranged as to permit longitudinal increment of the and sector for feeding the work. Disc B is supplied with a race cam groove in which engages a cam roll 1 whichis carried by an oscillating lever 2, the latter being supported for rocking movement on a shaft 328011 the machine frame. The tree extremity of the lever 2 is pivotally connected through a link 3 to an arm formed on the needle sector 4 whereby rotation of the cam disc serves to actuate the needle. Cain disc C has formed therein face .cain groove in w-hicl'i is a roll .5 carried by a reve -1c also rockable on h Shaft .328. The awl sector 7 has a rearwardly extending arm .8, the extremity of said arm being in substantial vertical alignment with the tree extremity of the lever 6, said free extremity of lever 6 being forked to provide spaced apart ears .9, 9?; said ears being provided with aligned openings in which mounted a stud screw 10, on e 'end of which has screw threaded en.- gagement with the opening in the ear v9. Freely rotatable on the stud 110 is a sleeve 11, the .extnemities of which abut against the inner surtaces of the ears 9, 9, respectively, said sleeve having projecting from diametri cally opposite sides a pair of pivot studs 12, 12?. 13 is a short link having its end 14 enlarged and pnovided with a central opening 1-5,'said opening being of a diameter slightly greater than that of the sleeve 11. Enlarge merit 14 is provided upon one face with a bearing surface 16 terminating in a shoulder 17 and against said bearing surface and shoulder is arranged to be positioned a cover plate 18, screws 19 being provided for. se curing said plate in fixed relation against the enlargement portion 14 of the link. The ting surfaces of the parts 14 and 18 are provided with co rnpjle nental sem rcircular openings, which, when the plate is in proper position, provide journal openings for the pivot studs 12, 12*. The opposite faces of the parts 14 and 18 are cut or beve-led away as indicated at 20, 21, respectively, whereby to permit the link 13 to rock lengthwise of studlOby reason of the arrangentient of the pivots 12, 12 carried by sleeve 11 on said stud. The opposite end of the link 13 is provided with an enlarged extremity 14 having a bearing surface 16 and a shoulder 17 against which is secured a. cover plate 18, the parts being similar to those already described. The parts 14 and 18 are provided with'c-oinpleniental openings forming journals wherein are pivot: ally supported'bearing studs 12 and 1% carried upon a sleeve 11 which in turn is mounted for rocking movement on a headed stud 10 fixed within the extremity of the a m 8 carr ed y the aw sect r, the deto lever .6 l 301111". groove said lever being pivoted at .4 upon the upper end Off link 45. The link pivoted at its lower end upon a stud 46, stud extending through aligned openings in a pair of spaced apart plates 4'? attached by means of screws, or other suitable devices, to a pair of posts 49, i0 upstanding from the slide ll (see Figs. 1 and 4). The posts 50 are provided with oj ienings in which are mount ed a pair of set screws 49, 50, respectively, the extremities of d screws being arranged to bear against the link 45 at opposite sides thereof, opposite stud 44, whereby to adjust the angular position of the link 45 a ut its pivot 46. .itdjacent the lower extremity of the lever 38 is a. thin plate or fin 51 extending outwardly from the post T, said plate being provided. with a series of openings 52, tor the reception 01" a pair of pins .53, 53 said pins passing through the plate and extending into the path of the end of lever 43 adjacent block 42. By means of said pins the limits of movements of block within the slot 41, may be adjustahl fixed.

54 is a friction plate arranged to bear against a curved surface 51 provided upon the edge of plate 5:31, said. members 54 being supported upon the end of a slide rod carried within an opening 56 in the lever 43. spring 57 serving to press the member 54 againstthe surface 51, the curv-atrufe oi the latter surface, as well of the slot 41, be ing formed with the stud 44 as a center.

(Ill 1'? AwZ mechanism operation.

reason of the above arrangement of par. it will be clear that on rotation of cam disc C the rocking movement produced by cam roll 5 on the lever 6 in a vertical plan will be transmitted through the link to the awl sector 7 whereby the aw] will have imparted to it the desired oscillation for penetrating and retracting from the work.

Rotation of the cam disc (I will also rock the lever 38 and through the slot 41 block 42 and lever 43 will impart a sliding movement to the slide member H. is they member H carries the post T, upon which is mounted the aw-l sector, the. latter will have imparted thereto a transverse movement sufficient to feed the work, the universal connections between the sector and the link '13, and also between the link 13 and the lever 6, permitting such movement to take place freely.

adjustment of the lever 43, as by means of handle'58, the amount of movement of the slide H may be varied at the will of the operator, the stud pins 53, 53 serving to determine such variation of adjustment within fixed limits, and the friction n'iember 54 serving to keep the lever l3 in its proper adjusted position. It should be noted that the feed finishes at the same point for all ad.- justments of feed length.

By manipulation of the set screws 419 and the position of the pivot 44 may be varied, whereby adjusting the position of the slide H, together with the awl sector relatively to the lever 38, this adjustment serving to take care of inaccuracies in the setting of the a wl as well as for slight variations in the mechanisn'i, due to wear.

The handle 58. carried by lever 13 is in a position to be easily manipulated by the operator, requiring merely an. upward or downward blow to give the necessary change in adjustment of the feed length, thus requiring the operator to remove his hand from the work for only a short period.

T bread pull- 0 77 This mechanisn'i is shown in detail in Figs. 4 and 32.

Extending rearwardly from the head Z is a bracket which provides a bearing 61 for a thread tension roll 62. The bracket at 60 provides a guide 63 in which travels a roller 64C, carried upon a pin 65 fixed in the lower end of a link 66. The upper end of link 66 ispivoted at 67 to the forked extremity 68 of a rearward extension 6 of the awl operating lever 6. 70 is a stud fixed near the lower end of link 66 and provides a bearing for a thread. guide roller 71. 7 2 is a. secondary bracket extending from the guide 63 and has fixed therein a pin. 73, having rotatable thereon a thread engaging roll. 74. As shown in Fig. 32, the thread passes from the. wax pot E over roll 7 1, under roll 71 and around tension roll 62, thence through the thread lock, the thread measurer and the take-up.

The operation of the thread pull-off is follows: In the operation of the machine the link 66 will be moved downwardly. as the awl is retracted. from the work, and as the thread is held in the thread clamp at this time, roll 71 in passing down the guide 63 and between tension roll 62 and guide roll 741 will serve to draw the thread from the sup- Looper mechanism.

This mechanism is shown in detail in Figs. 20 to 23, inclusive.

As constructed the looper lever 100 carries at its outer end an angular looper arm 101, which has at its upper end an offset thread eye 102. Lever 100 is provided at its opposite end with a 'ball103, adapted to engage in a double throw cam groove 104 of substantially circular cross section in cam disc B. Lever 100' is guided to move in a plane by means of guides 106 and 106 supported by the frame F of the machine, lever 100 being provided with an enlarged portion forming a slide. 107 ei'igaging between the guides. A double-forked link 108 7 carried by pin 109 is pivoted to lever 100 at 110, the

fork jaws engaging on either side thereof.

The ball 103' can move transversely to the axis of shaft S by means of the pivotalv shown in Fig. 3 the cam groove 104 varies V in the direction of the axis of shaft S, and as shown in Fig. 20 also varies radially therefrom, whereupon both movements are imparted to ball 103 by a single cam. (lam groove has a lateral opening 104 (Fig. 20) for insertion and removal of the ball 103, and pin 109 carries a coil spring 109 acting to raise link 108 to hold the ball in place, and to relieve the walls of the cam groove from its weight.

The operation of the looper mechanism is as follows: The cam groove 10 1 is so cut as to time the operation of the looper with relation to the needle, in the following manner:--As the awl pierces the work the looper moves to the position shown in Fig. 22 in a single plane away from the needle path,

at which time the usual thread finger 111 is positioned to receive the thread As the needle descends the looper follows the path shown substantially in the arc of a circle around the needle about 270 or three fourths of a revolution. Thismotion serves to lay the thread inthe thread finger 111 which then draws back and in the barb of the needle as shown in Fig. 28. The needle then begins to retract through the work, carrying the loop of thread with it, the thread. finger moving forward to deliver thread thereto, and as soon as the needle is out of the way the loopermoves by an almost radial path to the center of the are it has been describing, to a position directly under the hole in the work through which the needle has passed. As the needle further retracts, it is thereforeseen that the thread is pulled up in a straight path through the hole in the work, and through the eye of the looper. The looper remains substantially in this position during the taking'of the loop 7 from the barb of the needle and the taking thereof by the shuttle hook, the passing of the loop around the shuttle and the action of the take-up in drawing down theloop through

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