US1190199A - Presser-foot mechanism for sewing-machines. - Google Patents

Description

P SIOSTROM. PRESSER 'FOOT MECHANISM FOR SEWING MACHINES.

APPLICATION man MAR. 21. I915.

1,190.199. Patented July 4,1916.

5 SHEETS-SHEET I H u 1 Tlibwsses: l'rwenlor: 0kg? W .Pelez; Q'fiaslrom,

um mums nzrzns m. Pnurou'mc. msmmmm. 114 a P. SJOSTROM. v PRESSER FOOT MECHANISM FOR SEWING MACHINES.

APPLICATION FILED MAR. 27. I915.

Patent ed July 4, I916.

lhpenlor: feter'josbmm, by l i Witnesses afl W 6 4 P. SJOSTROM.

PRESSER FOOT MECHANISM'FOR SEWING MACHINES.

APPLICATION FILED MAR. 27. 1915.

1 ,1 90, 1 99 Patented July 4, 1916.

5 SHEETS-SHEET 3.

Inventor: leler joslrom,

P. SJOSTROM. PRESSER FOOT MECHANISM FOR SEW ING MACHINES.

. APPLICATION FILED MAR-27, I915. 1,190,199.

Patented July 4, 1916. v

5 SHEETS-SHEET 4.

' Inventor:

- l'elcr josh'om,

by I

Pr SJOSTROM.

PRESSER FOOT MECHANISM FOR SEWING MACHINES.

APPLICATION HLED'MAR.27. 1915.

5 SHEETS-:SHEET 5.

. Inventor: l'ebcr yo-sham,

1n: nonms runs an. Puamrrua. wuumsmu. n. a

Patented July 4, 1916.

IETER SJ'OSTROM, 01?

MACHINERY COMPANY, MASSACHUSETTS.

MAPLEWOOD, MASS or BOSTON,

ACHUSETTS, ASSIGNOR TO VICTOR SHOE MASSACHUSETTS, CORPORATION OF PB'ESSER-FOOT MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Original application filed February 17, 1915, Serial No. 9,465.

Divided and. this application filed March 27,

1915. Serial No. 17,943.

To all whom it may concern:

Be itknown that 1, PETER SJOSTROM, a subject of the King of Sweden, and a resident of Maplewood, in the county of Middlesex and State of Massachusetts, have in vented certain new and useful Improvements in Presser-Foot Mechanisms for Sewing-Machines, of which the following is a specification.

This invention relates to presser foot mechanisms for machines for sewing heavy material such as leather, and particularly to that class of machines known as welt sewing machines, and is a division of an application filed by me Feb. 17, 1915, and numbered 9,465.

The object of the present invention is "to provide a new and improved presser foot mechanism which will be automatically'operated to accommodate the presser foot to various thicknesses of material while the presser foot is also adapted to be removed from the work when desired without afiecting the automatic devices for actuating said presser foot. v 1

Another object of the invention is to profor automatically controlling the amount of thread drawn from the source of supply whereby the required amount of thread for various thicknesses assured.

The invention consists of certain novel features-of construction and arrangement of parts which will be fully understood by reference to the description of the drawings and to the claims hereinafter given.

Of the drawings: Figure 1 represents a side elevation of a machine embodying the principles of the present invention. Fig. 2 represents a sectional detail showing the opposite side of the presser foot mechanism. Fig. 3 represents a plan of the presser foot mechanism and the thread regulating vices. Fig. 1 represents a front elevation of the machine. Fig. 5 elevation of the same, and Fig. 6 represents a vertical section of the same. 1

Similar characters designate like parts throughout the figures of the drawings.

In the drawings, 19 is a connector the lower end of which is connected to any wellknown form of driving mechanism, while which bearings said vide said presser foot mechanism with means of material is always the opposite end engage the awl carrier represents a left end upon a pin upon the needle carr1er45 the upper lever 20 loosely mounted upon a stud 21 nonrevolubly mounted in a boss 22 formed upon 1 the frame 23,- the base 2 1 of which is adapted to be secured to any well-known form of support. The lever 20 is securedby means of the-bolt 26 to the gear segment 27, the hub '28 of which is mounted upon the stud 21 about the axis of which it is adapted to be oscillated.

By means of the connector 19, oscillatory movement may be'imparted to the gear segment 27, the lever 20 moving through an arc the ends of which are indicated by the dotted outlines a and b of the lever end. The teeth of the gear segment 27 mesh with the teeth of the 'gear 29 secured to a shaft 30 mounted in bearingsvin the frame 23, in shaft is adapted to be oscillated by means of the gear segment 2 The'shaft3O has a disk member 31' having formed thereon radial shoulders 3233 which are adapted to be engaged by a pin 34; extending laterally from the gear29. This pin 34, during theoscillation of the gear 29, will impart movement to the disk i with either of the shoulders ermitting said disk to remain at a standstill at the beginning of the movement of said pin 34 in either direction, that is, while traveling from the shoulder 32 to the shoulder 33 or vice versa. I

The disk 31 is provided with a cam projection 35 adapted to engage the truck 36 on a lever 37 pivoted at 38 to the frame 22 of said lever 37 being provided with a bearing member 39 adapted to when it is desired to feed the work. The awl carrier 40 is provided with the usual curved awl 11. The

truck 36 is retained normally in contact with the cam 35 by the spring 37 X which forces the front end of the lever 37 upwardly, this outward movement being limited by the stop pin 38*.

The bearing member 39 consists of a screw threaded to the end of the lever 37 and held in adjusted position by means of the clamping nut 42. The awl carrier 40 is mounted 13 extending through ears formed said pin being the clamping prevented from rotating by end is pivotally connected to a 31 when contactmg 3233, while Patented July 4., ram.

screw 46. The needle carrier 45 is provided with the usual curved barbed needle 47 and oscillates about the stud 47 fixed in the frame 23. The needle carrier 45 is provided with a radial arm 45 to the end of which is pivoted one end of a connector 106 the o posite end of which is pivoted at 105 to the disk 105 secured to and oscillating with the driving shaft 30. It is obvious that the oscillatory movement of the shaft 30 will be imparted, through the connector 106*, to the needle carrier 45 and in turn to the awl carrier 40. This awl carrier 40 is normally separated from the needle carrier-45 by the spring 48 being compressed when by the movement of the lever 37 theawl carrier 40 is moved toward the needle carrier 45 to feed the work.

For a detailed description of the work feeding mechanism reference may be made to the application #9465 hereinbefore referred to. A stud 50 is mounted'in the frame 23 which serves as a pivot for the presser foot carrier 58 having secured thereto the presser foot 59. 7

he carrier 58 has an upward extension 60'formed thereon by which the presser foot may be lifted from the work. The carrier 58 also has a rearward extension 61 to which is secured a ratchet plate .62 having a plurality of ratchet'teeth 63 formed thereon in an arc of a circle concentric with the pivot 64 of a pawl lever 65, the outer end of which has articulated thereto, at 66, a pawl 67 normally engaging the ratchet teeth 63. The pawl 67 is preferably secured by means of a pin 69 to a lever 68, also pivoted at 66. The lever 68 has secured thereto one end of a spring 70, the opposite end of which is secured to a fixed pin 71, the tension of said spring normally retaining the pawl 67 in engagement with the ratchet teeth 63. The forward end of the lever 68 is positioned within the forked end 72 of a hand lever 73 pivoted at 64 to said pivot 64 consisting of a stud extending through the lever 73 and the presser foot carrier 58 and being threaded to the lever all as shown in dotted lines in Fig. 3. The lever 68 is also provided on its under side with a cam projection 74 adapted to be engaged at predetermined times by a cam projection 75, upon a cam disk 76 secured to the shaft 30, inorder to disengage the pawl 67 from the ratchet teeth 63. The lever 65 is provided with a truck 77 adapted to be engaged by a cam 78 also mounted upon the shaft 30. The presser foot carrier 58 is also provided with a laterally extending arm 79 to which is secured one end of a spring 80 the opposite end of which is secured to a member 81 pivoted at 82 to the rear of the frame 23. The member 81 is also provided with a lateral cylindrical projection 83 extending over the lateral extension 79 which the presser foot carrier 58,

extension is provided with an upwardly extending flange 84 provided with a perforation through which the thread T passes from the source of supply between the projection 83 and the upper surface of the extension 79, then downwardly through a hole 85 in said extension and upwardly through another hole 86 therein over said projection 88 and downwardly through the hole 87 in said extension along the under face of said extension 79 to an eye 88 and then downwardly into the wax pot 89.

The thread T passes from the wax pot 89 to the work as fully described in the appli cation hereinbefore mentioned, the slack in the thread being controlled by the take up lever 98 pivoted at 101 and moved about said pivot by the connector 103 pivoted at one end at 102 to said take up while its opposite end. is pivotally connected at 104 to the disk 105. The shaft 30 extends beyond the left end of the machine and has adjustably secured thereto the arm 134 having a truck 135 at its outer end positioned in a cam groove 136 formed in a curved arm 137 of a lever 138. This lever 138 is pivoted at 139 and is provided with an oppositely ex tending arm 140 having formed on its outer end a gear segment 141. The teeth of this gear segment 141 engage the teeth of the pinion 142 secured to the shaft 143 formed upon the shuttle drive 144. The shuttle 14.5 is mounted in a suitable fixed raceway 146 having pivoted thereto, at 147, a cap 148 which is adapted to be locked by a bolt 149.

The lever 81 is provided with a boss 151 to which is threaded an adjusting member 152, said member having threaded thereto a locknut 153 and also having a string 154interposed between saidinut and boss and surrounding the member 152. The nut 153 has a flat-sided contact with the inner face of the lever 65 as indicated in Fig. 3 of the drawings. This member 152 is for the pur pose ofregulating the distance thelock of the stitch will be from the face of the work being operated upon, it being obvious that by adjusting the member 152 this lock may be located at any distance from the surface within reasonable limits. fact that all of the instrumentalities that assist in the formation ofthe stitch are opy means of the oscillating driving shaft 30 and if the time of operation of the thread measuring device is varied relatively to the operations of the other instrumentalities the location of the lock of the stitch will also be varied, this location depending on the amount of thread measured off. As the measurement of the thread is due to the movement of the lever 81 about its pivot and as this movement is caused by the engagement of the shoulder 162 with the end of the member 152 it isobvious that by varying the position of the engaging and of the member This is due to the I ping contact with the work.

152 the operation of the thread measuring device will be correspondingly varied and as a consequence the location of the lock of the stitch from the surface of the work will be similarly varied. WVhen the member 152 has been adjusted for any particular work its position remains unchanged and at each os cillation of the cam shoulder 162 the same amount of movement will be imparted to the lever 81.

As the operation of the machine continues, when there is any variation in the thickness of the material, the measurement of the thread will be automatically changed by the variation in the position of the presser foot upon said material. This is due to the fact that the thread measurer 83 and the presser foot 59 are equidistant from the fulcrum 54 so that when the presser foot is lifted a given distance to accommodate an increased thickness of material the lowering of the extension 79 will pull out more thread to accommodate this increased thickness of material. i/Vhen for any reason it is desired to pull out a quantity of thread T from the source of supply the operator may accom-' plish this by lifting the lever 81 and thereby drawing out the necessary length of thread which may then be pulled through the work support 118. When the work is to be inserted, the operator seizes the handles 607 3 and other releases the pawl 67 from the teeth 63, thereby permitting the presser foot 59 to be lifted. When the work has been positioned, the presser foot 59 is moved into con tact with the work and the handles 60-73 are released, thus permitting the pawl 67 to return into engagement with the teeth 63.

During the operation of the machine, the parts 58-65 and 68 are normally locked together, the cam 78 acting upon the roller 77 and retaining the presser foot 59 in grip- WVhen the feeding operation is about to occur, the gripping pressure upon the work will be released by the roller 77 entering the depression 160 in the cam 78 and the spring causing the presser foot to be slightly lifted from the work. The continued oscillation of the shaft 30 will cause the cam throw 161 to act upon the cam projection 74 and release the pawl 67 from the teeth 63 so that the presser foot 59 at the completion of each feeding operation may accommodate itself to any variations in the thickness of the work when returning into contact therewith. At this time the projection 74 is in contact with the cam and acts as a fulcrum whereby the action of the spring 7 0 will pull down the rear end of the member 65 and lift the front end thereof, thus causing the presser foot to be moved into light contact with the work after Which the cam throw 161 being removed from conby pressing them toward each tact with the projection 7 1 the pawl 67 will engage the teeth 63 and the continued reverse movement of the cam 7 8f willcause the presser foot togrip the work. It isobvious that the presser foot 59 is first brought into light contact with the work and subsequently the gripping pressure thereon is effected by the cam 78 and that this gripping pressure is the same regardless of the thickness of the material.

The spring 70 is of considerable importance in the operation of the machine. Under normal conditions it retains the pawl 67 in engagement with the ratchet teeth 63 in whatever position the presser foot 59 may be. WVhen new work is to be inserted it is desirable that the presserfoot 59 should be raised sufficiently to facilitate the positioning of the work upon the work support 118. To permit the lifting of the presser foot the pawl 67 is disengaged from the teeth 63 by the movement of the lever 68 about its pivot 66 against the tension of said spring 70; This movement of the lever 68 is accomplished by the movement of the lever 73 about its pivot 64, the operator gripping the handles 60-73, and pressing them toward each other. As soon as the pawl 67 has been disengaged from the teeth 63 the presser foot carrier 58 may be freely moved about its pivot 54 to lift the presser foot 59 while the work is being inserted, after which the operator releases the handles 60-73 and the spring 70 moves the presser foot 59 into light contact with the work after which the spring 70 will immediately act to move the pawl 67 into engagement with the teeth 63 and prevent any accidental lifting of the presser foot. At this time the presser foot is only in light contact with the work but when the cam 7 8 acts upon the roller 77 the carrier 58 is moved about its pivot 5i and the presser foot 59 is brought into gripping contact with the work. During this move' ment of the carrier 58 the pawl 67 is retained in contact with the teeth 63 by the spring 70 and if the ratchet plate 62 is moved the full length of a tooth 63 the spring 7 0 will cause the pawl 67 to be moved into engagement with the next tooth.

When the feeding operation is about to occur the roller 77 will enter the depression 160 in the cam 78 and permit the spring 70 to pull down the rear arm of the carrier 58 and slightly lift the presser foot 59 from the work. During this pulling down movement the pawl 67 will be held tightly enough against the teeth 63 by the spring 70 so that the carrier 58, lever 65,pawl 67, and lever 68 will act as if formed integral. At the completion of the work feeding operation, the pawl 67 will be disengaged from the teeth 63 by the cam throw 161acting upon the projection 74 of the lever 68 and mov- 'ing it about its pivot 66 against the tension of the spring 70. While the pawl 67 is disengaged from the teeth 63 and the projection 74 is on the highest part of the periphery of the cam 75 the spring 70 will pull down on the rear end of the lever 68, and as this is pivoted at 66 t0 the lever 65 it follows that the rear end of this lever 65 will also be moved downwardly and with the projection 74 as a fulcrum the front end will be moved upwardly, causing the carrier 58 to be moved about its fulcrum 54 and the presser foot 59 brought into light contact with the work. The same action occurs when the operator releases the handles 6073 after inserting new work. Subsequently in the reverse movement of the cam 75 the throw 161 on the work is always will pass beneath the projection 7 1 and the lever 68 will then be moved about its pivot 66 and the pawl 67 will become engaged with the teeth 63. After the pawl has become engaged with the ratchet teeth continued reverse movement of the shaft will cause the cam 78 to lift the roller 77 and move the carrier 58 about its fulcrum 54 with the presser foot 59 in gripping pressure with the work. The gripping pressure the same and is not applied until after the presser foot 59 has been brought into light contact with the work by means of the spring 7 0.

At every oscillation of the cam the end 162 thereof will act upon the member 152 to move the lever 81 about the pivot 82, thereby moving the lateral projection 83 away from the extension 79 and measuring off the required amount of thread to form the stitch. This projection 83 is normally retained in contact with the upper face of the extension 79 and binds on the thread T,

passing through the flange 81 to the open- '1ng'85. It is obvious that when this extension assumes a lower position, due to the increased thickness of the work, a greater 7 amount of thread will be delivered inasmuch as the-limit of the upward movement of the lever 81- is always the same.

In the operation of the machine, the operator grasps the handles 60 and 73, moving them toward each other, thereby disengaging the pawl (37 from the teeth 63, thus permitting the presser foot 59 to be moved upwardly about the fulcrum 5 1 of the presser foot carrier. The work is then placed upon the work support 118 and the operator then releases the handles 60 and 73, permitting the spring 70 to move the presser foot 59 into contact with the upper face of the work, time being moved into engagement with the teeth 63, and locking the various members together. The distance of the lock of the stitch from the surface of the work may be determined accurately by the adjustment of the member 152. The gear segment 27 is then oscillated in any wellknown manner.

the pawl 67 at the same This oscillation of the segment 27 will impart oscillatory movement to the gear and through this gear 29 to the main driving shaft 30. The pin 3 1 on the gear 29 will coact with the shoulders 32 and 33 of the cam member 35 and move this cam mem ber 35 at the end of the movement of the pin 34 in either direction. The movement of the cam 35 will operate the lever 37 moving it about its pivot 38 and cause the bearing member 39 to force the awl carrier 10 toward the needle carrier 15, the awl 1-1 at this time being in the work and causing the work to be fed so that the puncture therein caused by the awl will be brought into the plane of the needle 47, the awl 11 on completing its reverse movement being returned to its normal position by means of the spring 48. This reverse movement of the awl carrier does not occur until the point of the awl is entirely free from the under face of the work. During every oscillation of the cam 35 the heel portion 162 thereof coacts with the adjustable member 152 and raises the lever 81 about its pivot 82 against the tension of the spring 80. This lifting of the lever 81 will cause the lateral projection 83 thereon to be moved upwardly away from the extension 79 on the presser foot carrier 58, thus drawing from the source of supply the necessary length of thread T for the formation of the next stitch. Nermally the presser foot 59 is retained in gripping contact with the Work by means of the cam 78 acting upon the roll 77 mounted upon the lever pivoted at one end to the presser foot carrier 58 and at the other to the pawl lever 68. When the feeding operation is about to take place the depression 169 in the cam 78 permits the roll 77 to be lowered and the presser foot 59 to be raised by means of the spring 70. The cam throw 151 immediately acts upon the pawl lever (38 to disengage it from the teeth 63 and the spring then acts upon the lever 65 with the roll 77 as a fulcrum and causes the presser foot to be brought into light contact with the upper surface of the work in its fed positi on. The return movement of the cams and 78 will cause the pawl (37 to first .J

engage with the teeth 63 and then as the roll 77 moves from the depression onto the higher portion of the cam 78 the presser foot 59 will be forced into gripping contact with the work.

It is obvious that by this construction means is provided whereby at every movement of the work the presser foot may adjust itself for variations in thickness of the material. It is obvious also that by the presser foot 59 changing'its position for varying thicknesses of material, the lateral extension 79 on the carrier 58 will be raised or lowered and consequently a lesser or greater amount of thread T will be drawn from the source of supply, and to take care of these variations in the thickness of the material being acted upon.

It is believed that the operation and many advantages of this machine will be fully understood from the foregoing description.

Having thus described my invention, I claim:

1. In a machine of the class described, the combination of a stitch forming mechanism; a member for actuating said mechanism adapted to be oscillated during the formation of each stitch; means for oscillating said member; a work support; a presser foot mechanism; and a cam on said oscillating member for actuating said presser foot mechanism.

2. In a machine of the class described, the combination of an oscillating member; means for oscillating said member; a cam on said member; a work support; a presser foot provided with a rearward extension having ratchet teeth; a pivoted pawl engaging said teeth and controlled by said cam; and means pivoted to said presser foot extension for moving said pawl about its pivot.

3. In a machine of the class described, the combination of an oscillating member; means for oscillating said member; a cam on said member; a work support; a presser foot provided with a rearward extension having ratchet teeth; a lever pivoted thereto and controlled by said cam; a pawl pivoted to the free end thereof; resilient means for retaining said pawl in engagement with said teeth; and means for disengaging said awl.

p 4. In a machine of the class described, the combination of an oscillating member; means for oscillating said member; a cam on said member; a work support; a presser foot provided with a rearward extension having ratchet teeth; a lever pivoted thereto and controlled by said cam; a pawl pivoted to the free end of said lever; resilient means for retaining said pawl in engagement with said teeth; and automatic means for disengaging said pawl at a predetermined time.

5. In a machine of the class described, the combination of a work support; a presser foot provided with a rearward extension having ratchet teeth; a cam controlled lever pivoted thereto; a pawl pivoted to the free end of sald lever and having an arm provided with a cam engaging projection; resilient means for retaining said pawl in engagement with said teeth; and means for disengaging said pawl.

6. In a machine of the class described, the combination of a work support; a presser foot provided with a rearward extension having ratchet teeth; a cam controlled lever pivoted thereto; a pawl pivoted to the free end of said lever and having an arm provided with a cam engaging projection; re-

silient means for retaining said pawl in engagement with said teeth; and a cam adapted to engage said projection and disengage said pawl.

7 In a machine of the class described, the combination of a work support; a presser foot provided with a rearward extension having ratchet teeth; a cam controlled lever pivoted thereto; a pawl pivoted to the free end of said lever and having an arm provided With a cam engaging projection; resilient means for retaining said pawl in engagement with said teeth; a cam adapted to engage said projection and disengage said pawl; and a forked lever pivoted to said extension and adapted in its movement about said pivot to disengage said pawl.

8.. In a machine of the class described, the combination of a work support; a pivoted presser foot having a rearward extension provided with a lateral arm with a pluralityof thread holes therein; a coacting pivoted lever having a rounded projection; a spring interposed between said arm and lever to retain said projection in contact with the upper face of said arm; an oscillating member; and means on said'oscillating member for moving said lever about its pivot to measure the thread passing around said lever projection and through the thread holes in said arm.

9. In a machine of the class described, the combination of a worksupport; a pivoted presser foot having a rearward extension provided'with a lateral arm with a plurality of thread holes therein; a coacting pivoted lever having a rounded projection; an adjustable member on said lever; a spring interposed between said arm and lever to retain said projection in contact with the upper face of said arm; an oscillating member; and means on said oscillating member coacting with said adjustable member for moving said lever about its pivot to measure the thread passing around said lever projection and through the thread holes in said arm.

10. In a machine of the class described, the combination of a pivoted presser foot; a thread measuring device controlled thereby; and a single oscillating member for ac tuating both-said presser foot and measuring device.

11. In a machine of the class described, the combination of a pivoted presser foot having a rearwardly extending arm with a plurality of thread holes therein; a pivoted lever having a lateral projection coacting with said arm over which the thread passes between two of said thread holes; and means for moving said lever relatively to said arm to measure the thread. 1

12. In a machine of the class described, the combination of a pivoted presser foot having a rearwardly extending arm with a plurality of thread holes therein; a pivoted lever having a lateral projection coacting with said arm over which the thread passes between two of said thread-holes; and oscillating means for moving said lever relatively to said arm to measure the thread.

13. In a machine of the class described, the combination of a pivoted presser foot having a rearward extension and a lateral arm with a plurality of thread holes; a pivoted lever having a lateral projection coacting with said arm over which the thread passes between two of said thread holes; means for moving said lever relatively to said arm to measure the thread; a plurality of ratchet teeth on the free end of said extension; a pawl engaging therewith; and cam mechanism for controlling the engagement of said pawl.

14. In a machine of the class described,

the combination of a pivoted presser foot having a rearward extension and a lateral arm with a plurality of thread holes; a pivoted lever having a lateral projection coacting with said arm over which the thread passes between two of said thread holes; means for moving said lever relatively to said arm to measure the thread; a plurality of ratchet teeth on the free end of said extension; a pawl engaging therewith; cam mechanism for controlling the engagement of said pawl; and manually operated means for disengaging said pawl. 15. In a machine of the class described, the combination of an oscillating shaft; a gear secured to said shaft having a lateral projection; a member loosely mounted on said shaft adapted to be intermittently engaged by said projection; and a thread measuring device operable by said loosely mounted member.

16. In a machine of the class described, the combination of an oscillating shaft; a gear secured to said shaft having a lateral projection; a member loosely mounted on said shaft adapted to be intermittently engaged by said projection; a thread measuring device; and an adjustable member thereon adapted to be engaged by said loosely mounted member to operate said thread measuring device.

17. In a machine of the class described, the combination of a stitch forming mechanism; a driving shaft for actuating said mechanism adapted to be oscillated during the formation of each stitch; a work support; a presser foot; and means controlled by said Copies of this patent may be obtained for five cents each, by addresalng'the position of the stitch in the oscillating driving shaft for actuating said presser foot.

18. In a machine of the class described, the combination of a stitch forming mechanism; an oscillating driving shaft for actuating said mechanism adapted to be oscillated during the formation of each stitch; a work support; a presser foot; and cam members on said oscillating driving shaft for actuating said presser foot.

19. In a machine of the class described, the combination of an oscillating driving shaft; a work support; a pivoted presser foot having a rearward extension provided with a lateral arm with aplurality of thread holes therein; a coacting pivoted lever having a rounded projection; an adjustable member on said lever; a spring interposed between said arm and lever to retain said projection in contact with the upper face of said arm; and, means on said oscillating driving shaft coacting with said adjustable member for moving said lever about its pivot to measure the thread passing around said lever projection and through the thread holes in. said arm to determine the locking work.

20. In a machine of the class described, the combination of an oscillating driving shaft; a work support; a pivoted presser foot having a rearward extension provided with a lateral arm with a plurality of thread holes therein; a coacting pivoted lever having a rounded projection; an adjustable member on said lever; a spring interposed between said arm and lever to retain said projection in contact with the upper face of said arm; and means on said oscillating driving shaft coacting with said adjustable member for moving said lever about its pivot to measure the thread passing around said lever projection and through the thread holes in said arm to determine the locking position of the stitch in the Work.

21. In a machine of the class described, the combination of an oscillating member; a thread 'measuring device having a lateral lug thereon; a member threaded to said lug and adapted to be engaged by said oscillating member; a nonrevoluble nut on said threaded member; and a spring surrounding said member between said nut and lug.

Signed by me at Boston, Mass, this 17th day of March, 1915.

7 PETER SJOSTROM. fitnesses lVAL'rnR E. LOMBARD; NATHAN C. LOMBARD.

Commissioner 61? Eatents,

Washington, D. C.

Images