US1224423A - Take-up-actuating mechanism for sewing-machines. - Google Patents

Description

P. SJOSTROM.

TAKE-UP ACTUATING MECHANISM FOR SEWING MACHiNES.

APPLICATION FILED AUG.4, 1915.

1,224,423. Patented May 1, 1917 5 SHEET'SSHEET Fe & 'asiram P. SJOSTROM.

TAKE-UP ACTUAHNG MECHANISM FOR SEWING MACHINES.

APPLICATION FILED AUG4, 1915.

1 ,22 %Q3, Patented May 1, 1917'.

5 SHEETS-SHEET 2.

was PETERS co.. FHOYD-LIYHQ. WASHINGTON, 0 c

P SJOSTROM.

TAKE-UP ACTUATING MECHANISM FOR SEWING MACHINES.

APPLICATION FILED AUG.4,I915.

LQMAQS, Patented May1,1917.

5 SHEETSSHEET 3.

fur NORRIS PLYERs co PHOTO-LITHO WASNINCNN. u. c.

P. SJOSTROM.

TAKE-UP ACTUATING MECHANISM FOR SEWING MACHINES.

APPLICATION FiLED AUG.4, 191s.

1,22%,23. Patented May 1, 1917.

5 SHEETS-SHEET 4.

nu: NORRIS 1 5m; -;u.,/-wom LIVNII. WAbu/NUYON, u c

P. SJOSTROM.

TAKE-UP ACTUATING MECHANISM FOR SEWING MACHINES.

APPLICATION HLED AUG-4, I915.

Patnted May 1, 1917.

5 SHEETS-SHEET 5 @skra n45 mum/s PCYERS c0 PNOTO-LH'HO WASNINGTUN, c c.

TIYnTTnn STATES PATENT OFFTQE.

PETER SJ'OSTROM, OF MAPLEWOOD, MASSACHUSETTS, ASSIGNOR T0 VICTOR SHOE MACHINERY CO., OF LYNN, MASSACHUSETTS, A CORPORATION OF. MASSACHU- SETTS.

Specification of Letters Patent.

Patented May 1, 1917.

Original application filed February 17, 1915, Serial No. 9,465. Divided and this application filed. August 4,

1915. Serial No. 43,899.

To all whom it may concern:

Be it known 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 invented certain new and useful Improvements in Take-Up-Actuating Mechanisms for Sewing-Machines, of Which the follow- .ing is a specification.

This invention relates to takeup actuating mechanisms for machines for sewing heavy material such as leather, and particularly to that class of machines known as welt sewing machines.

The present invention is a division of another application filed by me Feb. 17 1915, and numbered 9,465.

Heretofore the takeup lever of a lock stitch sewing machine has been actuated by mechanisms driven from a main driving shaft rotatable in bearings in the frame and the principal object of the present invention is to simplify the construction and operation of this class of sewing machines by providing the machine with a main driving shaft which is adapted to oscillate in its bearing and which is provided with means for actuating the takeup lever during each oscillation and also has mounted thereon other means for actuating all of the mechanisms for forming a lock-stitch.

The invention consists in securing to an oscillating driving shaft a disk having pivotally connected thereto one end of a link the opposite end of which is pivotally connected to the takeup lever at a point inter mediate its pivot and the outer end of said lever.

The invention further consists in so curving the connector or link between said disk and lever that it will partially inclose the driving shaft during its movement.

The invention consists in 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 plan of a machine embodying the principles of the present invention.

Fig. 2 represents a front elevation of the same.

Fig. 3 represents an end elevation of the same.

Fig. 1 represents a vertical section of the same on line 44: on Fig. 2.

Fig. 5 represents a partial vertical section on line 55 on Fig. 2, and

Fig. 6 represents a horizontal section of the same on line 66 on-Fig. 5.

Similar characters designate like parts throughout the several figures of the drawmgs.

In the drawings, 20 is an oscillating lever to which movement is imparted by means of the connector 19 from any suitable source of power.

The lever 20 is secured'by 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.

The teeth of the gear segment 27 mesh with the teeth of the gear 29 secured to the driving shaft 30 mounted in bearings in the frame 23 in which bearings the said shaft is adapted to be oscillated by means of the gear segment 27 The machine is provided with a presser foot mechanism, a work feeding mechanism, a shuttle driving mechanism, and a thread placing mechanism, all as shown and described in said original application. As these devices form no part of the present invention they are not herein described, as

reference may be made to the original application for a complete description of the construction and operation of either of these mechanisms.

During the oscillation of the gear segment 27 the lever 20 moves through an arc of a circle from the dotted position a to the dotted position Z), as indicated in Fig. 3 of the drawings. The shaft 30 has loosely mounted thereon a disk member 31 having formed thereon radial shoulders 3233 which are adapted to be engaged by a pin 34: extending laterally from the gear 29. This pin 34, during the oscillation of the gear 29, will impart movement to the disk 31 when contacting with either of the upon the shaft 30.

shoulders 3233, while permitting said disk to remain at a standstill at the beginning of the movement of said pin 3% in either direction, that is, while traveling from the shoulder 32 to the shoulder 33 or vice versa.

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 23, the opposite end of said lever 37 being provided with a bearing member 39 adapted to engage the awl carrier 10 when it is'desired to feed the work. The awl carrier 10 is pro 'vided with the usual curved awl 11. The truck 36 is retained normally in contact with the cam 35 by the spring 37 which forces the front end of the lever 37 outwardly, this outward movement being limited by the stop pin 38*.

The needle carrier 45 is provided with the usual curved barbed needle 17 and oscillates about the stud 4' fixed in the frame 23.

A presser foot carrier 58 is pivoted at 5 1, said carrier having secured thereto the presser foot 59. The 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 6-1 supported by the carrier 58. On the pivot 64 is mounted 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 6% to the presser foot carrier 58, said pivot 64 consisting of a stud extending through the lever 73 and the presser foot carrier 58 and being threaded to the lever 65. The lever 68 is also provided on its under side with a cam projection 7% adapted to be engaged at predetermined times by a cam projection 75, upon a cam disk 76 secured to the shaft 30, in order to disengage the pawl 67 from the ratchet teeth 63. The lever is provided with a truck 77 adapted to be engaged a cam 78 also mounted 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 extension is provided with an 65 upwardly extending flange 841 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 83 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 wax pot 89 is clamped to the frame 23 by means of the clamping bolt 90 mounted in a projection 91 (see Fig. 2) formed upon one end of said wax pot. Olamped to one of the inner faces of the wax pot 89 by means of the clamping bolt 92 (see Fig. 2) is a plate 93. This plate 93 is provided at its lower end with a roll 94c partially around which the thread T passes, said thread then passing upwardly through the stripper 95- which serves to remove from the thread the surplus wax. The thread then passes to a roll 96 mounted upon the frame 23 from which roll the thread passes to an inner roll 97 mounted upon the thread takeup lever 98, said lever being also provided with an outer thread roll 99 to which the thread passes from the inner roll 97. Intermediate the rolls 97 and 99 and mounted upon the.

frame 23 is a roll over which the thread T is adapted to pass when the takeup lever 98 is in its lowest'position. When the takeup lever 98 is moved downwardly the coaction of the guide rolls 97 and 99 and the stationary roll 100 will form two loops in the thread, thereby obtaining the required amount of thread with onehalf the move ment of the lever 98 that would be necessary if said roll 100 was not used. This takeup lever 98 is pivoted to the stud 21 by the screw 101 and at 102 has pivoted thereto a curved connector 103, the upper end of which is pivoted at 10 1 to a cam disk 105 mounted upon and movable with the shaft 30. This connector 103 is provided with a recess 106 the walls of which are adapted to partially inclose the shaft 30 during the operation of the machine, the use of the said curved connector 103 being necessary to obtain the proper throw of the takeup lever 98 with relation to the timing of operation of the stitch forming mechanism.

The cam 105 is provided with a path 107 in. which is positioned a truck 108 mounted upon the rear end of the lever 109 pivoted at 110 and having mounted on its front end the thread placing member 115. The cam disk 105 has also pivotally con nected thereto at 105 one end of a curved connecting member 106*, the opposite end of which is articulated to an arm 45* extending upwardly from the needle carrier 45, said carrier 45 having oscillatory movement imparted to it through the connector 106 by the oscillation of the cam disk 105.

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.

WVhen for any reason it is desired to pull out a quantity of thread T from the source of supply the operator may accomplish 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 6073 and by pressing them toward each other releases the pawl 67 from the teeth 63, thereby permitting the presser foot 59 to be lifted. WVhen the work has been positioned, the presser foot 59 is moved into contact with the work and the handles 6073 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 gripping contact with the work. When 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 70 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 75 and acts as a fulcrum whereby the action of the spring 70 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 contact with the projection 74 the pawl 67 will engage the teeth 63 and the continued reverse movement of the cam 78 will cause the presser foot to grip the work.

It is obvious 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.

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 88 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 84 to the opening 85.

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

Extending downwardly from the work support 118 is a thread guard 120 secured at its lower end to the frame 23. On the rear face of the thread guard 120 is a roll 121 over which the thread T passes from the roll 99 on its way to and through the slot 119 in the work support 118.

The thread guard 120 has projecting rearwardly from its rear face the two fingers 122 with which the thread T contacts as it passes from the roll 121 to the work. To the hub of the lever 109 is secured a spring finger 123 the upper end of which is positioned between the projecting fingers 122. This spring member 123 is so constructed that when the lever 109 is moved forwardly about its pivot the end thereof between the fingers 122 will come into contact with the thread T at this point and force it against the rear face of the thread guard, thereby creating sufficient friction thereon as to grip the thread and prevent further movement thereof ,under normal conditions.

In the operation of the machine, the operator grasps the handles 60 and 73, moving them toward each other, thereby disengaging the pawl 67 from the teeth 63, thus permitting the presser foot 59 to be moved upwardly about the fulcrum 54 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, the pawl 67 at the same time being moved into engagement with the teeth 63, and locking the various members together.

The gear segment 27 is then oscillated by any suitable means. This oscillation of the segment 27 will impart oscillatory movement to the gear 29, and through this gear 29 to the main driving shaft 30. The pin 34 on the gear 29 will coact with the shoulders 32 and 33 of the cam member 35 and move this cam member 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 40 toward the needle carrier 45, the awl 41 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 41 on completing its reverse movement being returned to its normal position by means of the spring 48. This reverse movement of the awl carrler does not occur unt l the point of the pawl is entirely free from the under face of the work.

Any required feed of the thread may be obtained by adjusting the feed controlling member 49. 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. Normally 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 65 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 160 in the cam 7 8 in the movement of the latter comes to a point 0 posite the roll 77 and permits said roll 7 to be lowered and the presser foot 59 to be raised by means of the spring which retains the pawl 67 in engagement with the ratchet 63 and simultaneously pulls down the rear end of the rearward extension 61 of the presser foot carrier 58. The cam throw 161 immediately acts upon the pawl lever 68 to disengage it from the teeth 63 and the spring 70 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 position. The return movement of the cams and 78 will cause the pawl 67 to first engage with the teeth 63 and then as the roll 77 moves from the depression 160 onto the higher portion of the cam 78 the presser foot 59 will be forced into grippingcontact 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. This amount of thread drawn from the source of supply will be taken upduring the downward movement of the takeup lever 98 and when this lever 98 moves upwardly there will be a given amount of .slackness in the thread T between the roll 100 and the roll 99 and there will be notension upon the under thread when the stitch forming operation occurs. This slackness in the thread T is taken up when the thread is being drawn over the highest point of the shuttle 145.

This makes a very compact machine with parts reduced to a minimum, which is very effective in its operation, all of the operat-, ing devices being driven from a single oscillating driving shaft.

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 sewing machine provided with mechanism for forming a lock stitch, the

combination of a main driving shaft adapted to be oscillated and provided with means for actuating said stitch forming mechanism at each oscillation; a thread takeup lover; a disk on said drive shaft and oscillating therewith; a connector pivotally connected at opposite ends to said disk and lever; and means for imparting oscillatory movement to said main driving shaft.

2. In a sewin machine provided with mechanism for forming a lock stitch, the combination of a main driving shaft adapted to be oscillated and provided with means for actuating said stitch forming mechanism at each oscillation; a thread takeup lever, a disk on said drive shaft and oscillating therewith; a curved connector pivotally connected at opposite ends to said disk and lever and adapted to partially inclose said driving shaft during its movement about the axis of the pivotal connection with said disk; and means for imparting oscillatory move ment to said main driving shaft.

3. In a sewing machine provided with mechanism for forming a lock stitch including a presser foot mechanism, the combination of a main driving shaft adapted to be oscillated and provided with means for actuating said stitch forming mechanism at each oscillation; means controlled by the presser foot mechanism for measuring the thread; a thread takeup lever; means on said oscillating driving shaft for operating said presser foot mechanism; a disk secured to said oscillating driving shaft; and a connector pivoted at one end to said disk and at the other end to said lever at a point intermediate the outer end and the pivot of said lever.

4. In a sewing machine provided with mechanism for forming a lockstitch, the combination of a main driving shaft adapted to be oscillated and provided with means for actuating said stitch forming mechanism at each oscillation; a disk on said drive shaft and oscillating therewith; a thread takeup lever below said disk; a connector pivoted at one end to said lever and pivoted at the other end to said disk at a point above and to the rear of said shaft, said connector being pro vided with a recess in its forward edge adapted to inclose said shaft during the oscillation of said disk; and means for imparting oscillatory movement to said main driv ing shaft.

5. In a sewing machine provided with mechanism for forming a lockstitch, the combination of a main driving shaft adapted to be oscillated and provided with means for actuating said stitch forming mechanism at each oscillation; a member on said drive shaft and oscillating therewith; a thread takeup lever below said member and pivoted to the frame of said machine at a point to the rear of said shaft; a connector pivoted at one end to said lever and pivoted at the other end to said member at a point above and to the rear of said shaft, said connector being provided with a recess in its forward edge adapted to inclose said shaft during the oscillation of said member; and means for imparting oscillatory movement to said main driving shaft.

6. In a sewing machine provided with mechanism for forming a lockstitch, the combination of a main driving shaft adapted to be oscillated and provided with means for actuating said stitch forming mechanism at each oscillation; a pivoted thread takeup lever; a disk on said shaft above said lever; a connector between said lever and disk so pivoted to the latter that a gradually increasing movement will be imparted to the takeup lever during its operation of drawing thread from the source of supply; and means for imparting oscillatory movement to said driving shaft.

Signed by me at Boston Mass this 3rd day of August 1915.

PETER SJOSTROM.

Witnesses:

WALTER E. LOMBARD; NATHAN O. LoMBARn.

Genius of this patent may be obtained. for five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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