US1468317A - Wax-thread sewing machine - Google Patents

Description

W. C. MEYER WAX THREAD SEWING MACHINE Sept. 18 1923. 1,468,317

Original Filed April 28 1917 3 Sheets-Sheet 1 javenfor Sept. 18 1923. 1,468,317

W. C. MEYER WAX THREAD SEWING MACHINE Ox 'iginal Filed April 28 1917 3 Sheets-Sheet 2 fivenfiz?" Sept. 18,1923. 1,468,317

W. C. MEYER WAX THREAD SEWING MACHINE Original Filed April 28 917 3 Sheets-Sheet 5 i Z; ,16 3a 3.54

V E 1 254- :E ,6; M

i H E f WILLIAM' c.

Originalapplicatioi filed April 28, 1917, Serial No. 165,107.

, a citizen of the United States, residing at Beverly, in the county of Essex. and State of Massachusetts, have invented certain new and useful Improvements in W aX-Thread Sewing Machines; and I 'do hereby. declare the following to be afull, clear, and exact description of the invention, such as will enable others skilled in the art to which-1t appertains to make and use-the same.

This invention relates to wax thread sew-' ing machines and, more particularly, to take-up mechanisms for such machines.

The invention is particularly designed to applied to chain stitch machines for sewmg inseams' of shoes, and is illustrated in this application as embodied in such a ma chine. The invention is not to be regarded as limited, however,to machines of this particular class but certain features thereof may be applied to other machines. 2

l The primary object of the present inven- "tion is to produce a wax thread sewing ma chine having a take-up mechanism which" may be readily regulated to operate in a certain reliable and improved manner on threads having different degrees of elasticity. 1.

With this object in view, the invention consists in certain novel and improved constructions, arrangements and combinations of parts hereinafter described and particularly pointed out in the claims,-the advantages of which will be obvious to those skilled in the art. r

This application constitutes a division of application Serial No. 165,107, filed April 28,1917, and in the accompanying drawings the-invention is illustrated as embodied inthe. machine forming the subject-matter of said application. 1

The features of the invention will be readily understood from the drawings illustrating the invention in its preferred form, and the following detailed description of the constructions therein shown. r

In the drawings, Fig. 1 is a view in side elevation of a machine embodying the invention illustrating-a portion of the head of the machinewith certain parts of the frame removed to showinore clearly the structure. Fig.2 is a detail plan view, partly in section,

HIEYER, 015' BEVERLY, MASSACHUSETTS.

illustrating the take-up mechanism accompanying face 46 formed on retain V e srenoa iueonmnny CORPORATION, or PATEESON, nnwannsnv, A oon-roaarron on NEW JERSEY. a

WAX-THR A snwnve acrame.

Fig. 3 is a view in side elevation of the mechanism shown in Fig. 2; Fig. 4 is an under side plan view illustrating a portion of the mechanism shown in Figs. 2 and 3; Fig. 5 is a view in side elevation of the mechanism shown in Fig. 4; Fig. 6 is a view similar to Fig. 5 illustrating certain of the parts in different positions; and Fig. 7 is a detail sectional view taken substantially on the line 77 of Fig. 6.

The machine illustrated in the drawings is provided with a curved hook needle 2, a feed point'or awl l, a looper 6, a tension wheel 7, a channel guide 8, a back gage l0 and a back rest 12. All of these parts have the same construction, arrangement and mode of operation as of the machine-illustrated and described in appli'cants application referred to above, and a further description of the same in this application is unnecessary.

The take-up as herein illustrated consists of a roll 16, mounted on the forward end of an arm 18, carried by a lever 20 pivoted on a stud 22. The lever 20 is actuated from a cam lever 2 (Fig. l) pivoted on a stud 26, the

- Divided and this application filed September Serial No. 252,970.

the corresponding parts forward end of the lever 20, to prevent lateral play ofthe arm The arm is acted upon by a spring 38 coiled about the stud 85 and having oneend engaged beneath a pin 40 mounted on the arm, and the other end engaged beneath a pin 12 mounted on the lever 20. This spring tends to maintain the arm in its upper limiting position relative to the lever 20, with a stop the arm in engagement with a stop face 48 formed on the lever.

The arm 18 is cut away at an angle to the stop face 46, as indicated at 50, so that the arm is enabled to swing downwardly, relatively to the lever 20, from its upper position. The downward swinging movement of the arm 18 relative to the lever 20 is limited by the engagement of an adjustable abutrelative to the lever.

ment screw 52 threaded into a projection 54 on the arm with the stop face 48 on the lever. The abutment screw is held in ad{ justed position in said projection, by means of asetscrew 56. The thread passes from the tension wheel 7 under a thread roll 58 mounted on the frame plate 59, then over the thread roll 16 and through the eye of the looper file the work. The arm 18, when free to swing relatively to the take-up lever 20,has the action of an auxiliary take-up or similar slack thread controller, said arm actingv to control the slack in the thread during the first part of the retracting stroke of the takegup lever. During the loop drawing stroke of the take-up leverthe arm 18, under the resistance exerted by the thread, swings relatively to the takeup lever against the tension of the spring 38 until the abutment screw 52 engages the stop face a8 on saidv take-up lever,after which the arm moves as one with the lever. During the first partof the retracing stroke of the take-up lever, the arm l8swings in the opposite direction rela tively to the lever 20 under the action of the spring 88 until the stop face 16 on said arm engages the stop face 48 on the take-up lever,

thus keeping the thread taut between the tension device and the work at this period in a cycle of stitch-forming operations. At this time the looper is encircling the needle and laying thethread in the needle barb, and the action of the arm 18 in keeping the thread taut insures the proper threading of the needle by the looper.

In sewing with thread, the elasticity of which is very slight, such as linen thread, it is found to be desirable that the arm 18 be arranged to operate as above described, to controlthe slack in the thread and keep the thread taut durin the first part of the retracting. stroke of the take-up lever to insure the threading of the needle. In sewing with thread, however, the elasticity of which is relatively great, such as cotton thread, it has been found that the stitches ordinarily will be tightened andset in a more uniform andreliable manner with the arm 18 secured rigidly to the take-uplever so as to move as onetherewith throughout both forward and retracting strokes of'the takeup lever, and that the thread will be kept taut during the first part of the retracting stroke of the take-up lever by the elasticity of the thread itself. To enable this latter result to be secured, mechanism is provided for locking the arm. 18 rigidly to the takeup lever 20. In the construction illustrated, the locking mechanism for the arm 18 comprises a lockingarm 6O pivoted on a boss 62 on the take uplever 20, and constructed toembrace the lower part of the take-up lever as shown clearly in Figs. 2 and 7. The arm 60 is providedwith a projection 6 f constituting an abutment for engagement with the upper the position shown in take-up lever 20, the a m GQ isswungforwardly and upwardly to locate the projection (it thereon above the lateral projection 66, as shown in Fig. 5. lVith the arm 60 in Fig. 5, the arm 18 will be held from swinging movement relative to the lever20. In order to hold the arm 60 either in the position shown in Fig. 5, or

that shown in Fig. 6, a retainingdevice is provided. This retaining device consists of a ball 68 mounted in a bore. in the arm 60 and acted upon by a'coiledspring 70, said ball being arranged to engage in either of the recesses 72 and '74 formed in the take-up lever 20. These recessesare so located that when the arm 60 is in the position shown in Fig. 6, the retaining ball 68 is engaged in the recess 72, and when the arm 60 is in the position shown in Fig. 5, theball is. engaged in the recess 74. The retaining device will hold the arm 60 in either of its positions, but will permit the arm to bemoved readily from one of such positions to the-other. The rearward movement of the arm 60 is limited by the engagement of; the forwardly directed end of a projection 76 formed on the arm with the pin 12; This projection may also serve as an operating handlefor the arm 60 to be grasped by the operator in manipulating the arm. 7 i f Having explained the natureand object of the invention and having specifically described a machine embodying the,various features of the invention in their preferred forms, what is claimed is:

1. A- wax thread sewing machine having, in combination, stitch-forming devices including a hook needle, alooper, take-up mechanism comprising a take-up lever, an arm pivotally mountedon the forward end of the lever, a take-up roll carried by the arm, a spring acting on the arm andtending to swing the same in one direction relatively I from movement relative to. the lever. V

2. A wax thread sewing machine having,

in combination, stitch-forming devices including a hook. needle, a looper,*take-up mechanism comprising-a take-up lever, an arm having an abutment pivotally mounted on the forward end of the lever, a take up roll carried by the arm, a spring acting on iao the arm and tending to swing the same in one roll-carrying arm from movement in oppodirection relatively to the lever, a stop for sition to the action of the spring'when the limiting the movement ofthe arm relative locking arm is in one position, and to be 10 to the lever under the action of the spring, located out of position to engage the abut- 5 and an adjustably mounted locking arm havment on the roll-carrying arm When said 7 ing an abutment arranged to engage an abutlocking arm is in another position.

ment on the roll-carrying arm tolook the WILLIAM C. MEYER.

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