US1064406A - Machine for sewing boots and shoes. - Google Patents

Description

A. WARD & A. S. GENT. MACHINE FOR SEWING BOOTS AND SHOES.

APPLICATION FILED OGT. 24, 1911.

Patented June 10, 1913.

3 SHEETS-SHEET 1.

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COLUMBIA FLANOGRAPH cO..wASiuNGToN, 0. c4

A. WARD & A. S. GENT. v MACHINE FOE SEWING BOOTS AND SHOES.

APPLICATION FILED OUT. 24, 1911.

Patented June 10, 1913.

3 SHEETSSBEET 2.

[raven/271 5. m- M COLUMBIA PLANOGRAFH 1:13., WASHINGTON, n. c.

A. WARD & A. S. GENT.

MACHINE FOR SEWING BOOTS AND SHOES.

APPLICATION FILED 00124, 1911,

Patented June 10, 1913.

' 3 SHEETS-SHEET 3.

COLUMBIA PLANOGRAPH c0., WASHINGTON, D. c.

UNTTE STATES PATENT @FFTQE.

ARTHUR WARD AND ALBERT SAMUEL GENT, OF NORTHAMPTON, ENGLAND, ASSIGN- ORS TO THE UNIVERSAL SHOE MACHINERY COMPANY LIMITED, OF NORTHAMP- TON, ENGLAND.

MACHINE FOR SEWING BOOTS AND SHOES.

Application filed October 2 1, 1911.

To a?! 10710711 it may concern.

Be it known that we, ARTHUR \VAnn and ALBERT SAMUEL GENT, formerly of 27 York road, Northampton, England, both subjects of the King of Great Britain, and residents of Cleveland Works, Cleveland Road, Northampton, England, have invented new and useful Improvements in Machines for Sewing Boots and Shoes, of which the follow ing is a specification.

The present invention has reference to chain stitch machines for sewing welted boots and shoes and turnshoes and the object of the invention is to improve the construction of such machines so that they will work at an improved rate of speed.

In rapidly driven sewing machines for the above purpose difficulties are found to arise in connection with the thread measur ing mechanism which is apt to put an undue strain upon and break the thread.

The present invention is directed to the improvement of the machine so that the thread shall be properly measured and laid in the needle, and the stitches tightened.

The improvements will now be described and the points of novelty hereinafter pointed out in the claims.

In the accompanying drawings, Figure 1 shows a side elevation partly in section, of part of a welt sewing machine embodying our improvements, Fig. 2 is a side elevation of the opposite side of the machine. Fig. 3 shows detachably the striker and its connections and the tappet, and Figs. 1 and 5 are enlarged front and sectional elevations of the brake wheel.

Referring to Figs. 1, 1 and 5:-1 is the brake wheel over which the thread 2 passes from the wax pot (not shown in the drawings, being of usual construction). This brake wheel 1 which occupies the position in the machine usually occupied by the tensionwheel, diflers therefrom in that it is mounted to turn freely upon a boss 3 bolted to the framework 4 of the machine. This boss 3 is formed with a loose segmental portion 5 and between the two parts 3 and 5, and resting in recesses formed in the part 3, are springs 6 tending to force the two parts 3 and 5 apart, and against the inside of the brake wheel 1 mounted thereon. The boss 3 is also provided with an outer threaded portion? upon which is mounted a IlOIl-IGX" Oluble washer 8 and nuts 9, for holding the Specification of Letters Eatent.

brake wheel 1 in position.

Patented June 10, 1913.

Serial No. 656,538.

This arrange ment allows a free movement of the brake wheel 1 and at the same time owing to the spring boss bearing upon the inside thereof, puts a slight friction thereon, sufficient to prevent the wheel overrunning when the thread is being intermittently drawn off. It also allows of a very free movement of the thread when drawn upon by the measuring mechanism to be presently described. The thread passes from the brake wheel 1 to a thread measuring device, for measuring off the desired quantity of thread required for each stitch according to the thickness of the work (seam substance) being sewn. Attached to the framework of the machine and in a line with the path of thread 2 are two pulley wheels 10 and 11, and intermediate between the two pulley wheels 10 and 11, and on the opposite side of the thread 2 is situate a vertically movable pulley wheel 12. Upon the welt guide slide 13, which may be of the usual construction, is mounted in suitable bearings a short horizontal shaft 14 carrying at one end a crank pin 15, and at the other end a tappet, or pivoted lever 16 see Figs. 2 and 3. The crank pin 15 is con.- nected to a slide 17 upon which is mounted the pulley wheel 12 above mentioned. The slide 17 is guided in its movements by the guiding piece 18 which is pivotally mounted in the framework of the machine as at 18*,

see Figs. 1 and 3. The tappet 16 is held in its normal position by means of the spring 19 attached thereto and to the welt guide slide 13. The tappet 16 is operated by a striker 20 which has at its back end a boss 21 which is pivoted on a stud fixed in a bell crank lever 22 which is pivoted on a stud 23 fixed in a convenient position on the main frame. Also fixed conveniently on the main frame is a stud 24 on which is mounted a, cam lever 25 which engages by means of a cam roll 26 with the cam 27. This cam lever 25 is connected to the bell crank lever 22 by means of a link 28 connected at either end by studs 29 and 30. It will thus be seen that at each revolution of the cam 2'? the striker 20 will be given a thrust due to the cam lever 25 actuating the bell crank lever 22, thus striking the tappet 16. This in turn rocks the crank pin 15 and draws down the slide 17 carrying the pulley wheel 12. In order to enable the desired quantity of thread to be drawn from the wax pot it is clamped in advance of the pulley wheel 12 by means of the clamping device 31. This device 31 is actuated by a rocking shaft 32, cam lever 33, cam roll 34: and cam Thus it will be seen that the clamping device when rocked bears on the roll 11 and holds the thread. securely during the downward movement of the pulley wheel 12.

lt will be noted that the distance between the forward point of the striker 20 in its normal position, and the tappet 16, is a variable one according to the thickness of the work being sewn and that therefore the range of movement of the pulley wheel 12 will also be a variable one; in consequence it will draw a longer or shorter length of thread from the waX pot as circumstances require. After passing the measuring clevice the thread 2 then passes to a fixed pulley wheel 36 and around the spring-actuated auxiliary take-up 37 to the usual take-up 3S, and thence through the looper 39 to the work as usual.

In Fig. 2, as is the lever supporting the looper 39, and 19 is the thread finger. ldounted upon the arm 50 of the machine, which arm carries the usual cam levers, is a bracket 51. This bracket 5]. is provided with a cylindrical portion 52 containing a plunger 52*, a compression spring 53, and an adjusting screw 54. The upper end of the looper lever 48 has upon its outer side a. cup-shaped socket 55 situated approximately opposite similar cup shaped socket 4 56 formed in the end of the plunger 52*.

The two cup shaped sockets and 56 are connected. by a double ball connection 57, in such a manner that the spring 53 tends to force the looper lever roll 58 against the surface of its cam while at the same time it allows the looper lever to swing freely under the action of its roll 59 when operated by its cam groove. This method of mounting the spring for keeping the looper levr rolls 58 and 59 against their respective cam surfaces, insures the said rolls accurately following the paths of the said cams, and obviates the jumping of the rolls, so frequently a source of defective action of the machine when running at a high rate of speed and also allows of a new spring being rapidly and easily inserted if desired without dismantling other parts of the machine.

The operation of the machine is as follows :To start sewing the work is held in position against the boot rest guide and the thread passed around the thread finger as usual. The pricker then enters the work, the boot rest guide is unlocked, and the welt guide slide 13 is also unlocked and Qoples of this patent may be obtained for pushed back by its cam lever. The pricker then feeds the work and causes it to come in direct line with the needle. The welt guide slide 13 is then allowed by its cam lever to come back to the work and together i the pulley wheel 11 and the pulley wheel 12- is then operated by means of the striker 20 and tappet 16 to measure a length of thread for the next stitch. When the and is right back, the threadfinger again takes the thread and the looper 39 with the thread circles the needle. At the same time the channel guide and the pricker are moved back for a fresh feed. The needle then retires carrying the loop through the work. The pricker again enters and feeds the work for the next stitch. The needle again enters the work, through the loop already around it, to take a fresh loop from the looper 39. The take-up 3S and auxiliary take-up 37 take up the slack thread and tighten the aforesaid loop around the needle and so set the stitch. The new loop is then drawn through the work by the needle and the above cycle of operations repeated. What we claim and desire to secure by Letters Patent of the United States is 1. In a chain stitch machine for sewing welted boots and shoes and turnshoes, a thread measuring device and means for regulating the same, comprising a welt guide slide, a tappet carried by the welt guide slide for operating the said measuring device and a striker for operating the tappet, the arrangement being such that the dis tance of the tappet from the striker may be varied automatically by the thickness of the work, substantially as described.

2. In a chain stitch machine for the Durpo-se specified, a thread measuring device comprising two fixed pulley wheels, a movable pulley wheel acting intermcdiate of the fixed pulley wheels, a clamping device for the thread, a welt guide slide, a tappet mounted on the welt guide slide for operating the movable pulley wheel, a striker for operating the tappet and means for operating the striker, substantially as described.

In testimony whereof we have signed our names to this specification in the presence of two subscribing witnesses.

ARTHUR IVARD. ALBERT SAMUEL GENT.

Witnesses C. B. LiDnoN, R. lViLLIAMs.

five cents each, y ess ng the Gore-missions at n s Washington, 1). G.

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