US940054A - Sole-sewing machine. - Google Patents

Description

T. G. PLANT.

SOLE SEWING MACHINE. APPLIOATION FILED mum, 190s. RENEWED APR. 14,1909.

Patented NOV. 16. 1909 4 SHEETS-SHEET 1.

T. G. PLANT. SOLE SEWING MACHINE. APPLICATION FILED FEBML 1908. RENEWED APR. 14,1909. 940,054. Patented Nov. 16, 1909.

4 SHEETS-SHEET 2.

.y 04 inventor Atty T. G. PLANT.

SOLE'SEWING MACHINE.

APPLICATION FILED FEBA, 190s. RENEWED APR. 14,1909.

Patented'Nov. 16. 1909.

4 SHBETSSHEET 3.

t ..m rl. @P pm T b ww wm 0 ZUufnesses:

T. G. PLANT. SOLE SEWING MACHINE. APPLIUATION FILED PEBA, 1908. RENEWED APR. 14,1909.

g i ,0? 8 l a w 4 m a my ix 7 -D .i =5: i

fru/entai" r hoinasaPlant I -al lc results. retain the increased or clamping pressure of THOMAS G. PLANT, OF BOSTON, MASSACHUSETTS.

SOLE-SEWING MACHINE.

sienna.

Specification of Letters Patent.

Patented Nov. 16, 1909.

Application filed February 4, 1908. Serial No. 414.161. Renewed April 14, 1909. Serial No. 489,893.

T all'whom it may concern:

Be it known that l. Tnoius G. PLANT, a citizen of the United States. residing at Boston. in the county of Suti'olk and State of Massachusetts, have invented an improvement in Sole-Sewing Machines, of which the following description, in connection with the accompanying drawings, is a specification, like numerals on the drawings representing like parts.

The invention to be hereinafter described relates to sole sewing machines of the gen eral type described in United States Letters Patent No. 473,870, dated April 26, 1892. in machines of this type, the work has been supported upon a stationary table and held in place by a movable presser foot capable of being locked in work clamping position,

- at which time. obviously, the work could notbe adjusted or itsposition changed. It was ncces.-ar v. however, that he work be fed and also removed from the machine. therefore. provision as made in said patented ma chine to release the clamping action of the presser toot when the awl was in the work during the feeding movement and again at "the completion of each stitch formation.

. ever. neither the awl nor the needle was in the material. so that machine control of the work was lost. and it was liable to be moved by theoperative with obviously objection- Attempts have been made to the presser foot'upon the work, and the consequent machine control thereof. at. all times. except during the intervals of feed, and means have been provided under the control of the operative for unlocking the presser toot atdesired times. In thus unlocking the presser foot betweenteed movements b v these prior methods. however. it has been necessary to retain in action the devicesfor giving the increased pressure. in other words, it' the operative found it desirable to adjust. or manipulate the work, lic \\'a called upon to unlock the presser toot white the increased pressure was maintained. and then hit the presser toot against. the force of the devices impartil'ig the increased pressure.

Vit'h these considerations in view. the present invention aims to do away with the necessity of thus manipulating the presser foot while the. increased pressure is maintained, thus avoldmg stress upon the maclnneand operative; to provide means for relieving the increased pressure prior to unbe made clearby the following descriptionand accompanying drawing of one form or embodiment ot the invention and its identifyin g features.

In the drawings Figure 1 is an' end elevation of a sole sewing machine embodying the present invention. only sutlicient of the sewing devices being illustrated to make clear, to one skilled in the art, the cornice-- tion and relation of the invention thereto, the presser toot being shown in raised position: Fig. 2 is a view similar to Fig l, with the press-er foot in lowered and increased pressure position: Fig. 3 is a front elevation of the machine viewed from the left. Fig. 1, parts of the sewing instrumentalitics being omitted for clearness of illustration. and a part of the frame being in section; Fig. 4

is a sectional detail on the line -l--l. Fig. .l'

5 is a sectional detail on the line Fig. 2: Fig. (3 is a section on the broken line t2-6. I ig. 3, showing a form of reversing and stopping'device; and Fig. 7 is a detached detail of the slide and adjacent parts.

The machine frame 1 ma be of appropriate character to provide support for the working parts. Jourualed in bearings 2, 2, Fig. 3, is the main shaft 4: having thereon the several cams 5, l0, 7 and Sfor imparting motion to the machine elements.

' Referring to Figs. 1 and '2. the worktable 9 is appropriately supported from the frame work of the. machine. and may be as indicated in Patent No. H3370 to which reference has been made. The presser foot 10 is carried by an elbow shaped lever 11 loosel mounted upon a stud or like appropriate support 12 projecting from a bracket 13 formed as part of or secured to the machine framing. At its rear end the lever 11 has connected to it a link ll. which extends looselv-through a lug 1.") on the arm 16 also mounted .ioselv upon the support 12 or a suitable boss upon the lever 11. and above said lug the link it is surrounded lie ' ed to be engaged by a washer 17, which is acted upon by a spring 18, adjustable as to its'force by a nut 19 screwed upon the end 20 of said link 14.

The rear end with ratchet teeth or a ratchet dog 21 adaptat times b one or more 22, said pawls being (:arried by a lever 23, fulcrumed on the machine frame by means of a pin or stud 24. The rear end of the lever 11 is likewise provided with ratchet teeth or a ratchet dog 25, adapted to be engaged by pawls 26 mounted at27 upon the machine frame, said pawls having rearward extensions 28 adapted to be engaged by the widened end 29 ofthe lever 23 when said lever is depressed to trip the pawls. A stud 30' projecting from the machine frame serves to trip the 23 is sufficiently depressed.

To the lever 11 at 32 is connected the vertically movable frame 31 normally under pawls the lifting action of a suitable spring 33 tending to maintain the presser foot in light engagement with the work. The pawls 22 are engaged by aspring 35 carried by the lever 23 and said spring acts to normally turn the pawls into engagement with the ratchet teeth or ratchet dog 21. acting on the pawls 26 normally turns them into locking engagement with the ratchet teeth or ratchet dog 25. I

The parts so far described, with the exception of possible details as to form and the mounting of the spring 34, are and may be substantially as pointed out in Patent-No. 473,870.

Mounted loosely uponthe stud 24 is an said arm having secured thereto a pin 37 carrying a roll 38 traveling in the cam path-39, Figs. 1 and 2, of a cam 40, secured to the main shaft '4.

Disposed. between the arm 36, and the substantially horizontal portion of the lever 23,,

is a slide 41 having the cam grooves or slots 42 and 43. These cam slots, best, shown in Figs. 4, 5 and 7, extend longitudinally of the slide 41 and for part of their length are substantially straight or devoid of relative divergence, but near the end of the slide,

the left end viewing Fig. 7 their relative divergence is greatest. The pin 37, on the side of the arm 36 adjacent the slide 41, carries a roll 44, 4 and 5, which travels in the groove or slot 42 of the slide 41; and the lever 23, on the side adjacent the slide 41, carries a roll 45 mounted on a pin or stud 16, said roll 45 traveling in the other groove or slot 43 of the slide 41.. From this con struction it will be apparent that the lever 23' derives motion from the cam groove 39 only through the arm 36 and interposed slide 41, and that movement 'of said slide 41 longitudinally will turn the lever 23 upon its fulcrum by virtue of the relative divergence of the grooves or slots 42, 43. In

of the arm 16 is provided pawls 22 when-the lever A spring 34 the arrangement ofgrooves or slots illus trated, their relation is such that upon moving the slide 41 forward, or from the posi tion shown in Fig. 2 to that shown in Fig. 1, the lever arm 23 will be turned in a downward directionupon itsfulcrum pin or stud 24; and by reverse movement of the slide said lever arm 23 will be raised. I This dire c tional movement is arbitrary, however, as it will be at once obvious that changes will suggest themselves in carrying into practical formthis feature of the invention.

The lever 23 is provided with a slot 47, Figs. 1 and 2, through which projects a pin 48 secured to the slide 41, said pin 48 preferably carrying a. roller, as indicated. Pivoted to the machine frame at 49 is a shifting arm 50, the upper portion of which engages the pin 48'or-its roller, preferably by means -of the bifurcated end portion 51, whereby movement of the shifting arm 50 upon. its pivot longitudinally between the lever 23 and the operating arm 36.

Mounted upon the a hand lever 52 portion, at 53, the link 54, which extends rearward to and is connected with the shift ing arm 50 by a pin 55, Figs. 2, 3, 4 and 5. The pin 55 projects beyond the nut 56, Figs. 3 and 4, and has secured to itoneendofa spring 57 the other end being connected to a pin 58 secured to the main frame, said spring 57, Fig. 1, thus acting .to draw the arm 50 toward the rear,- as will be apparent. WVith the parts disposed as in Fig. 1, it will be apparent to those skilled in the art, that upon rotation of the shaft 4, the riser of the cam groove 39 acting upon the roll 38 of the ar'm 36 will cause the lever 23 to be depressed, thereby unlocking the pawls 22 and 26 from the ratchet teeth or dogs 21 and 25 respectively, at which time the presser foot is held in work engagement by the light spring 33 alone. formed and timed with reference to the operation of the awl, that the above unlocked condition occurs when the awl has enteredthe material and continues during the feed' movement, and' then, preferably just prior to the withdrawal of the awl, the action of thrcam groove 39 raises the lever 23 to biiug the presser' foot into position of increased pressure, where it may remain until after the awl has again penetrated the work. Thus, except when the awl is in the material or during the intervals of feed, the'presser foot is in position of increased pressure, due to the action of the pawls, spring 18 and connections, as will be readily understood by those familiar with this class of machines.

To release the work during intervals between feed movements, to put in new work, or to adjust the work for any purpose, as, for instance, when a thread breaks land a having jointed to its lower The parts are so 49 will cause the slide 41 to. move' fresh start is to be made, it was heretofore necessary in this type of machine to unlock ahe presser foot from its lower holding pawls while the Full increased pressure due to the spring 18 was acting, and to then raise and hold the presser foot against this pressure with one hand, while,. with the otheigthe shoe might be manipulated. In the present invention this condition is obviated, it-being only necessary to push the handle from the position shown in Fig. :3 to that 1'. that. the link fi-L turns the arm upon its tulcrmn pin 49, thus moving the slide 41 forward into the position indicated in Fig. l, which has the effect of lowering the lever 23. as described, thus relieving the increased pressure of the presser foot in the first instance by lowering the pawls 22, while still in engagement with ratchet teeth 21,,the distance between the lower part of said pawls and the pin 30, after which the pawls 22 are i ripped by the pin 30, and the pa-Wls 26 are tripped to unlock the presse'r foot, Which is now entir ly free with the exception of the be t s ngaction due to spring 33. Thus it will oe'clear that the presser foot can be rel ased at any time to permit adjustment of earl; and when so released or unlocked that the increased pressure is not maintained.

The work having been adjusted, it is desirable to reapply the increased pressure, and lock the presser foot. This is done by the present. invention by movement of thehandle 52 from its position, Fig. 1, to that of Fig. 2, such movement of the handle causing a reverse-action of the slide 41, so that as the diverging or cam portions of the slots or grooves in the slide 41 act upon their associated rolls on the arm 36 andlever 23 respectively, the latter is raised, thus allowing .the pawls'22 and 26 to engage their respective ratchet dogs, and then, by further upward movement of lever 23, to lift the end of the arm 16,- thereby applying the in creased pressu1",'th'e pawls 26,'at such time, again acting to lock the presser foot in such position of increased pressure.

hen the handle 52 is moved to release tlw'presser toot, it is desirable that it may be raised clear of the work at times. and as one means of accomplishing this result. there is, in the present invention, a stop or shoulvown in Fig. 1,.the result being der 5%). l*igs. l, 2 and 3, formed by a plate secured by screws (30, or otherwise, to the. presser toot lever 11, the construction being such that upon iea'rward movement of the. handle .32. said handle, after releasing the presscr foot both from the action of the increased pressure devices and its locking pa wls. will contact with the stop or shoulder 5.9 and raise the presser foot to its full} raised position, Fig. '1. such action being-effected against the light spring 33.

In order that the presser toot may be antomatically returned to its position of increased pressure and locked in such position, the tension of the spring 57, acting to turn the shiftingarm :70, may be such as to move the slide ell rearward when the handle 52 is released, with the result. that the lever 23 will be raised, the pawls be thrown into engagement with their ratchet dogs, the increased pressure be restoredand the presser foot be'locked in its position of increased pressure.

\Vhen it becomes desirable to remove the work at. the end of asewing operation and to place anew piece of work in the machine, obviously, the awl and needle must be out of the work and the presser foot must be raised, in other Words, the machine should be stopped or brought to rest with these parts in such predetermined position. To insure that the press-er foot shall be released from its position of increased pressure and. unlocked, and that it be raised into substantially the position indicated in Fig. 1, when the machine is finally brought. to rest, the present invention provides means, operative as the machine approaches its final stopping position, to automatically place the presser foot in the desired relation with respect to the work.' As one means of securing this end, provision is'made for reversing the action of the machine parts when a sewing operation is con'ipleted. such reversal being utilized to move the slide l1 and depress the lever 23, as will now be described.

shaft 4 has loosely mounted thereon a driv- Referring to Fi s. 3 and 6, the driving pivotally mounted on the machine frame 63,-

Fig. '3, one arm of which is provided with a yoke 64 engaging a ring-65 loosely mounted on the hub 66 of the clutchmember (31;

the other arm 67 of said lever bein con-- nected at (38 to a treadle rod (39. Obviously, any well known means may be employed to shift the clutch member 61.

Fixed to the shaft at, as by the key 70, is the fast 'clutch member 71, Figs. 3 and (3, suitable friction material 72 being interposed betweenthe members 61 and Tl, so that the latter may be appropriately driven from the former when the two are brought together, as will be readily understood. Loosely mounted on the hub 72", Fig. h. of the clutch member 71, a step arm 73 to which, at H. is secured one end of a coiled spring 75, the other end of said spring being secured to the clutch member 71. at 76. From this it will be clear with the machine in operation that should the clutch member 61 be disengaged from the member 71, and

the stop arm 73 be stopped from rotation i with member 71, the latter will be moved for some distance by the momentum ofthe machine elements, thus winding up the spring 75, and that the tension of the wound spring will first bring the machine to a stop without shock and then reverse the same .until finallyarrested, as will now be explained.

A stud or pin 77, Fig. 6, secured to the machine frame extends parallel to thedrivshaft 4, and has mounted thereon a sleeve 78 free to turn and slide thereon.

Projecting from the sleeve 78 is an arm 7 9, carrying a stop fingerv 80, appropriately se-' The sleeve cured there by suitable bolts 81. 7 8 and stop finger 80. are normally influenced by a spring 82, see dotted lines ing to move movable in the opposite direction by means of a bell crank lever 83, pivoted at 84 to the machine frame, and connected by a treadle rod 85 to a suitable treadle, not necessary to illustrate, but preferably the same as that from the to'which the rod 69 is connected.

The stop arm 73 projects a short distance beyond the face of the cluteh"member 71, or as shown in Fig. 3, a little to the right thereof, so that if the stop finger is permitted to be moved by its spring 82 to the left,

Fig. 3, it will be in position to be engaged by the advancing edge of the stop arm 73, and thus arrest its further movement; This position of the only be assumed when the clutch member '61 is disengaged from the other clutch memas stated, the rods 69 and 85 bar 71, since, are connected to or operated by the same treadle.

- On the face of the clutch member 71 is a cam or stop '86, Figs. 3 and 6. This cam stop 86, as shown in Fig. 3, does not extend face of the clutch member 71 as far as does'the stop arm 78, so that should the treadle be released and thestop finger 80 be moved by its spring 82 toward the face of the clutch member 71, the said stop finger will ride upon the. face of the said' clutch member and rise over the inclined surface 87 of the cam stop 86 and, upon being met by the stop arm 73, will arrest said stop arm as hereinbefore pointed out. The spring'75' having been wound or tensioned by the continued movement of the clutch member 71 after the stop arm 73 has.

Fig. 3, tendthem to the left, Fig. 3, or to-v ward the face of clutch member 71,a nd are strike the stopfinger 80 in tion,

stop finger, however, can

clearly understood by those clutch member '71 without shock, the arm 79, Fig. 6, has secured the'reto a brake-shoe 89, said brake-shoe being preferably adjustable on said arm as by the slot 90 and bolt 91.- Thus, as the stop arm 73 strikes the stop finger-80, it will turn the. sleeve 78 about the stud 77 and apply the brake, the brake being normally held from engagement with the clutch member 71 by means of a spring 92 Fig. '6, one end of which is secured to a pro-. jection 93 on the arm 79, and the other end' to a pin 94 connected to the machine frame.

When the clutch member- 71 has been.

brought to rest and then reversed by the spring'7 5, the end 88 of the cam stop 86 will the reverse direcand to cushion this shock, the sleeve 78 has projecting therefrom a toe 95 which 'bears upon a stop pin 96contained in a seat 97 and normally held.- in its position by means of a spring 98.

Mounted on the machine frame, Figs. 1

and 2, is a studshaft 99 carrying an arm 100 loosely mounted thereon, the lower end "of said arm being connected at 101 to a link 102 having a bifurcated end 103engag1ng the shifting arm 50 preferably. bymeans of an extension .of the pin 57, as shown in Fi 1 and 5. said pin having a head 1041 or maintaining the link 102m proper engage-,-

ment therewith.

Mounted upon a pin 105 carried at the upper end of the lever or arm 100 is a dog 106 having at its end a. roll 107 bearingupon the peri hery-of a camv 108 carried by the main sha 4. This dog 106 is normally acted upon by a spring 109, one end of which is connected to said dog at 110 and the other to a pin 111 carried by a collar 112 on the stud shaft 99, the tendency of said spring being to. normally turn the dog from the dotted line position, Fig. 2, into its full line position, a stop 113 being provided to limit the run of the ,dog in the direction of the arrow, Fig. 2.

From the construction described, it will be that during the normal operation of the machine, the roll 107 on the dog 106 will ride idly upon its cam 108, the spring 109 yielding as the riser of its cam passes under the roller 107. On the reverse movement of the cam 108, however, the riser 108*, see dotted lines, Figs. 1 and 2, will act upon the dog 106 in the reverse direction, and as said dog.

is now held from turning in the reverse directlon by means of the pm 113, the riser skilled in the art 108* will move the lever 100 about its stud shaft 99 as the riser of the cam 108 passes from the position indicated in Fig. 2 to that indicated in' Fig. 1, the result being that the link 102 acting upon the shifting arm 50 will cause the'slide 41 to be moved forward and to the'left from the position shown in 2 to that shown in Fig. 1, with the result that the increased pressure upon the presser foot will first be released,then', the presser foot will be unlocked, and by further move mentof the slide and shifting arm 50, the link 54: will turn the handle about its fulcrum 12-, causing itto contact with the stop 59 and thereby raise the presser foot entirely from the work. The operation of the machine will be clear to those skilled in the art without further elucidation, it being noted that when the treadle is depressed, it will act through the treadle rods 69 mil 85 to cause the clutch member 61 to be thrown into engagement with the clutch member 71,

and simultaneoasly therewith the bell crank 83, through its pin connection 11-1 with the sleeve 78, will cause the stop finger 80 to be withdrawn from its stopping position. At each rotation of the main shaft, thelever 23 will be operated to release the presser foot from its position of increased presure duringthe intervals of feed,-and should it be desirable at any time to adjust the work upon the table, or if for any reason it bee'o'mes desirableto raise the presser foot, the handle 52 can be moved by the attendant from the position shown in Fig. 2. to that shown in Fig. 1, the result of which is that the increased pressure upon the presser foot will first be relieved altogether, and, then, the presser foot will be unlocked further movement of the handle 52 causing the presser foot to be lifted clear of the work. On releasing the handle 52, the presser foot will be again restored to its position of increased pressure and locked in such position, preferably by means of the spring 57, as herein.- before explained. On the completion of a sewing operation, the attendant will release the treadle with the result that the clutch members will be disengaged, and the stop finger 80 will move to the left, Fig. 3, to be engaged by the stop arm 73, the momentum of the machine carrying the clutch member 71 a part of the revolution until the spring 75stops and reverses the clutch member and the machine parts, bringing them to rest in a predetermined position, as before noted. This reverse motion of the machine parts and the driving shaft 4 causes the riser 108* to act upon the dog 106, and, through the connecting devices, as already described, move the slide 41, thereby relieving the presser footfrom increased pressure, unlocking it, and raising it to a position free of the work.

Vhile the present invention has been described in detail as embodied in the mechanical structures herein selected forillustrative purposes, it is to be understood that the invention and its identifying. characteristics are not circumscribed by these details, which may be varied. It is believed to be broadly nei'v in a machine of this general character to provide means for giving to a presser foot a position of increased PI'QSSUL" and locking the same, and to provide means for first relieving the presser foot of its increased pressure and then unlocking it so that it may be moved at any time free of the work, whether by the operative or by the action of the me. chanical parts themselves.

Claims.

1. in a sole-sewing machine, the combination with a -work support, of a movable presser-foot, means to force said resser-foot against the work on the work support with a normally light'pressure, means to increase .said pressure at intervals. and to lock said presser-foot when the ressure has been increased, and means an er control of the operative to successively release. the pr'esserfoot. from increased pressure and to unlock the prcsser-i'oot.

2. In asole-sewing machine, the combination of a work support, a movable presserfoot, means to force said presser-foot against the work on the work support with a normally light pressure, means to increase said pressure at intervals and to lock said presserfoot when the pressure has been increased, means under control of the operator to release the presser-foot from increased pres-- sure and then unlock the presser-foot, and to restore such increased pressure and lock the pressure. p p v 3. In a sole-sewing machine, thecombination of a work support, a movable presserfoot, means to force said pressenfoot against the work on the work support with a. normally light pressure, means to increase said pressure at intervals and to lock said pre'ss'erfoot when the pressure has been increased, meansunder control of the operator to re lease the presser-foot from increased pres sure and thereafter unlock the presser-foot, and automatically acting means to restore such increased pressure and lock thep'resser foot in its position of increased pressure.

4. In a sole-sewing machine, the combination with a work support, of a movable presser-foot, means to force said presserfoot.

against the work on the work support with a normally lightpressure, means to increase said pressure at intervals and to lock said presser-footwhen the pressure has been increased, means under control of the operator to release the presser-foot from increased pressure and to thereafter unlock the presser foot, and means for thereafter lifting the presser foot from the work 5. 'In a sole-sewingmachine, the combination of a work support, a movable presserfoot, means to force the presser-footagainst the work on the work support with a normally light pressure, means to increase said pressure at intervals and to lock the resserfoot 'in its position of increased pressure, means operative by stopping the machine to pre'sse'r foot again in its position of increased a normally light pressure, means to increase said pressure at intervals and to lock the presser-foot in its position of increased pressure, means for reversing the movement of the shaft, and means operative on such reverse movement to release the presser foot from increased pressureand to unlock the presser-foot.

7. In a sole-sewing machine, the combination with a work support, of a movable presser-foot, a spring acting with a normally light tension to force the presser-foot against the work on the work support, means to increase'the pressure of the pres'ser-foot upon the work at intervals and to lock the PT GSSEF-fOOt in position of increased pressure, and means under control of the operative to first relieve the presser-foot of said increased pressure and thereafter unlock said resser-foot.

8. In a sole-sewing machine, the combination with a work support, of a movable resser-foot, a spring acting with a normally light tension to force the presser-foot against the work on the work support, means to increase the pressure of the presser-foot upon'the work at intervals and to lock the resser-foot in position of increased pressu e, means under control of the operative to first relieve the pressenfoot of said'increased pressure and 'thereafter to unlock said presser-foot, andmeans to automatically rcstore the increased pressure of the presser-foot and to lock said presser-foot in position of increased pressure.

9. A sole-sewing machine comp 'ising, in combination, a work support, feeding devices to move the work at intervals, a presserfoot, means to produce pressure of the presser-foot upon thework; means to increase said pressure of the presser-foot at intervals and to lock the presser-foot in position of increased pressure during inter 'als between 'teed'mm'ements, means under control of the operator to relieve the presscr-foot from such increased pressure and to then unlock the presser-foot atdesircd times during the intervals between food movements, and means to automatically restore the increased pressure of the presser-foot and to lock the press'er-foot in positidn.

10. A sole-sewing machine having in combination a driving shaft, a cam operated thereby, a work support, a presser-foot normally held against the work with a light pressure, means including a lever operated at intervals from said cam to increase the pressure of the presser-foot upon the work and to lock the presser-foot in. osition of increased pressure, and means ormoving said lever independent of the cam forreleasingthe increased pressure of the pre'sserfoot and unlocking the same.

11. A sole-sewing machine having, in combination, a shaft, driving and stopping means therefor including means for rovers ing the rotation ofsaid shaft as the ma chine is finally brought to rest, a cam on said shaft, a work support, a presser-footnormally held in light contact with the work, means to increase the pressure of the presser-foot upon the work at intervals and lock it in position of increased pressure, and means rendered effective by the said cam upon reverse movement thereof to release the increased pressure of the presser-foot and unlock the same.

12. In a sole'-sewingmachine,the combination of a shaft, driving and stopping means therefor including means for reversing the I rotation of said shaft as the machine is finally brought to rest, a work support, a presser-foot normally held in light contact with the work on said support, a lever, lever operating means for periodically moving said lever from said shaft to increase the pressure of the resser-foot and lock it in position of increased pressure, and means operative on reverse movement of said shaft for moving said lever independentof said lever operating means to release increased pressure of th\e presser-foot and unlock the same.

13, In a machine of the character described, the combination of a driving shaft, starting and stopping mechanism therefor, a work support, a. presser-foot and means to force it with a light pressure upon the work placed on said support, means including a lever and its actuating cam operated from the driving shaft to increase the pressure of the presser-foot upon the work at. intervals and to lock the presser-foot in position of increased pressure, means independent of said actuating cam for moving said lever to release the presser-foot from its position'of increased pressure and to unlock the same as the machine is stopped and to restore said increased pressure and lock the presser-foot in its position of increased pressure wheu' said shaft at intervals, a pawl movable with said lever, means operated by said pawl for imparting increased pressure to the presser foot, a locking awl for holding the press-01 foot in pos tion of increased pressure. and

means under control of the operative to successively relieve the presser foot of increased pressure and to unlock said locking'pawl.

15. in a sole sewing machine, the' combination of a driving shaft, a relatively m ov able work support and presser-foot, means to relatively move said work support and resser-foot to hold the work between them 1neans to increase the pressure of the work support and resser-foot upon the work, means for rever'slng' the movement of the driving shaft, and means operative on such reverse movement to release thework from said increased pressure.

16. In a sole-sew1ng machine, the comb nation of a driving shaft, a relatively movable work-support and presser-foot, means for relatively moving said work-support and presser-foot to hold the work between them, means to increase the pressure of the work-supportand resser-foot upon the work, means for arresting the driving shaft and causing its movement to be reversed and the machine stopped witlr the parts in predetermined position, and means operative on such reverse movement to re lease the work from said increased pressure. In testimony whereof, I have signed my name to this specification, in the presence of

Images