US1151767A - Thread-measuring device for sewing-machines. - Google Patents

Description

E. ERICKSON.

THREAD MEASURING DEVICE FOR SEWING MACHINES.

APPLICAHON FILED SEPT. 8. 1914.

2 SHEETS-SHEET I.

E. ERICKSON.

THREAD MEASURING DEVICE FOR SEWING MACHINES.

APPLICAHON FILED SEPT. s. 1914.

1 1 5 ,7'6'7. Patented 31, 1915.

2 SH SHEET 2.

wmsesr Me m? r Edward Embksam,

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EDWARD EBICKSON, OF LYNN, MASSACHUSETTS,

ASSIGNOR TO VICTOR SHOE MACHINERY 00., OF BOSTON, 1VTASSACHUSETTS, A CORPORATION OF MASSA- CHUSETTS.

THREAD-MEASURING DEVICE FOR SEWING-MACHINES.

Specification of Letters Patent.

Patented Aug. 31, 1915.

Application filed September 8, 1914. Serial No. 860,798.

To all 107mm it may concern Be it known that I, ED\VARD ERICKSON, a subject of the King of Sweden, and a resident of Lynn, in the county of Essex and State of Massachusetts, have invented certain new and useful Improvements in Threadl\1easiu-ing Devices for Sewing-Machines, of which the following is a specification.

This invention relates to thread measuring devices for sewing machines and more particularly to such thread measuring devices which are automatically adjusted to pull off varying amounts of thread in accordance with the thickness of the work be ing operated upon.

The object of the invention is to provide a thread measuring device which will be simple and efficacious and capable of operation at high rates of speed. The various features employed to the accomplishment of thisobject, and such others as may hereinafter appear, will best be understood from the following description and accompanying drawings of the preferred embodiment of the invention.

Of the drawings:

Figure 1 is a vertical section through a sewing machine embodying the present invention. Fig. 2 is a detail view of the thread locking and pulling-off mechanism, and Fig. 3 is a detail View, looking in the opposite direction from Fig. 1, showing the presser foot and its operative connections with the main cam.

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

The general structure of the sewing machine shown in the drawings may be and preferably is the same as that of the machine shown and described in another application filed by me on December 28, 1912, Serial No. 739,056, saidoriginal application having matured into Patent No. 1,137,198, dated April 27, 1915. as in that application, the machine frame 10 is provided with bearings to support the main shaft 11 upon which are mounted cams for actuating the several parts of the machine. The presser foot 12 is carried on the end of the lever 13 which is pivotally mounted at 11 andwhich isactuated to :lift the presser foot, once during'the formation of each stitch, by the action of a gear 16 which meshes with a segmental rack 15 on the presser foot lever. The gear is actuated through connections w th a cam path 17 on a cam 18 and mechanism generally indicated at 19 to lock the presser foot while the awl pierces the work, all as fully described in the prior application.

The course of the thread through the machine is shown in Fig. 1. The thread enters the machine from any suitable source of supply through a guide 20 and then leads to the locking and pulling off device, which will be hereinafter described, and then into a wax pot 21. The wax pot contains a roll 22 around which the thread passes to receive its coating of wax and a stripper 23 which removes the superfluous wax therefrom. From the stripper the thread passes through an eye in theend of a light spring 24 which serves to takeup anyslack thread which may occur during the formation of a stitchand then around a fixed roll 25 and around the rolls 26 on the takeup lever'27 and to the stitch forming instrumentalities. The rolls26 on the takeup lever coact with a fixed roll 28 to set the stitch as described in the above mentioned application; In the illustrated embodiment of the invention the takeup lever ispositively actuated in both directions by a pair of cams 29 and 30which engage a fork 31 on the rear ofthe'lever.

The thread locking and pulling: off device is shown on an enlarged scale in Fig. 2. The thread passes through a diagonal hole 32 in ablock 33 and then down the fiat'back surface of the block to a hole 31 through 10 in engagement'with a cam ll on the main shaft 1.1.

The 1 01140 is actuated only by the higher portion of the cam so that the pin 35 is moved to a fixed point away from'thej block 33 but allowedzto return into contact there with in whatever position the block may be found. It is apparent that the movement of the pin 35 away from the block 33 will pull thread from the source of supply, the thread extending from the pin 35 through the wax pot to the work being held taut during the movement of said pin 85 by the member 22, the stripper 23 and the takeup mechanism. As the block forms an abutment for the pin, the thread which lies on the flat rear surface of the block is gripped between the pin and the block, thus locking the thread to resist the strain of setting the stitch.

In order that the amount of thread pulled off may vary in accordance with the thickness of the work, provision is made for ad justing the position of the block 33 through connections with the presser foot so that the pulling off movement of the pin 35 is varied. The block is mounted on an arm 4L5 pivoted at 46 on the machine frame and connected at its end with the arm 37 by a spring 47. The arm 45 is also connected by a link l8 with an extension 4-9 of the presser foot lever 13. By this construction the block 83 is moved to the right in Fig. 1 when the thickness of the work increases, and as the pin 35 is connected with the block by the spring 47, the pin follows the block so that the next movement of the pin will pull off a correspondingly greater amount of thread. It is apparent that the length of thread pulledoil will vary directly with the distance between the. presser foot and the work support.

Connections are made with a treadle, not

' shown in the drawings, whereby the presser foot may be lifted and the thread unlocked. The upper end of the treadle rod 51 is connected with an arm 52 extending from a rock shaft 53 which causes the presser foot to be unlocked when the shaft is turned, as is described in the prior application. The treadle rod also carries a pin 54: which, after the presser foot is unlocked, engages an arm 55 extending from the arm 45 and lifts the presser foot through its connection with the arm 45.

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

Having thus described my invention, I claim:

1. In a device of the character described, the combination of a work support, a presser foot movable toward and from the work support, a thread pulling member, means independent of said presser foot for actuating the pulling member whereby it is always moved to a predetermined point on its thread pulling movement, a thread engaging abutment to position the pulling member in its inoperative condition and with which it coacts to lock the thread, a spring for normally retaining said pulling member in contact with said abutment, thereby locking the thread, and connections between the abutment and the presser foot whereby the abutment is moved in accordance with the movement of the presser foot.

2. In a device of the character described, the combination of a work support, a presser foot movable toward and from the work support, a thread engaging block, a thread pulling member normally coacting with said block to lock the thread, means independent of said presser foot for actuating the pulling member, means actuated by the presser foot whereby the position of said block is changed and the movement of the pulling member is varied in accordance with the thickness of the work engaged by the presser foot, and yielding means connecting said presser foot actuated means with the pulling member.

ln a device of the character described, the combination of a work support, a presser foot movable toward and from the work support, a block engaging the thread at two points, a thread pulling member engaging the thread between said two points, means for holding said memberyieldingly against the block, means for actuating the pulling member and connections between the presser foot and the block whereby the block is moved in accordance with the thickness of the work engaged by the presser foot.

4. In a device of the character described, the combination of a work support, a presser foot movable toward and from the work support, a thread pulling member, means for actuating the pulling member, a thread engaging block coacting with the pulling member to lock the thread, connections between the block and the presser foot, and means for moving the block to unlock the thread and lift the presser foot.

5. In a device of the character described, the combination of a work support, a presser foot movable toward and from the work support, a thread pulling member, an arm carrying an abutment to limit the movement of the pulling member, a spring for normally retaining said pulling member in con tact with said abutment, a link connecting the arm and the presser foot, and means for moving the arm to lift the presser foot.

6. In a device of the character described, the combination of a work support, a presser foot movable toward and from the work support, a thread pulling member, means for actuating the pulling member, a coacting thread engaging block, a spring to hold the pulling member against the block to lock the thread, connections between the block and the presser foot whereby the position of the block is varied in accordance with the thickness of the work, and manually act ated means for moving the block.

.7. In a device of the character described, the combination of a work support, a presser foot movable toward and from the work support, a thread pulling member, an arm carrying an abutment to limit the movement of the pulling member, a spring for normally retaining said pulling member in contact with said abutment, a link connecting the arm and the presser foot, and a reciprocating member controlled by the operator for moving the arm to lift the presser foot.

8. In a device of the character described, the combination of a work support; a pivoted presser foot coacting therewith provided with a rearward extension; a pivoted arm; a link between said extension and arm; an abutment on said arm; an oscillating arm provided with a, lateral pin; a spring between said pivoted arm and said pin-carrying arm normally retaining said lateral pin in contact with said abutment to lock the thread; and a cam for moving said pin-carrying-arm about its pivot against the tension of said spring.

9. In a device of the character described, the combination of a work support, a presser foot movable toward and from the work support, a thread engaging block movable into various positions by the movement of said presser foot due to different thicknesses of material engaged by said presser foot, a

movable member engaging the thread on said block and adapted to pull the thread therefrom during its movement, means for holding said member yieldingly against the block and locking the thread, and means independent of the oresser foot for moving the thread pulling member away from said block always to a predetermined point.

10. In a device of the character described, the combination of a work support, a presser foot movable toward and from the work support, a thread engaging block movable into various positions by the movement of said presser foot due to different thicknesses of material engaged by said presser foot, a movable member engaging the thread on said block and adapted to pull the thread therefrom during it; movement, means for holding said member yieldingly against the block and locking the thread, and a revoluble cam for moving the thread pulling member away from said block always to a predetermined point.

Signed by me at Boston, Mass, this 11th day of August, 1914.

EDWARD ERICKSON. lVitnesses:

WALTER E. LoMBARD, EDWARD F. ALLEN.

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

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