US1017440A - Shoe-sewing machine. - Google Patents

Description

W. C. MEYER.

SHOE SEWING MACHINE.- APPLICATION FILED NOV. 4, 1904.

Patented Feb. 13, 1912.

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' W. G.'MEYER.

SHOE SEWING MACHINE.

APPLICATION FILED NOV.4,1904.

Patented Feb. 13, 1912.

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gait @6566- W. O. MEYER.

SHO-E SEWING MACHINE.

APPLICATION FILED NOV. 4,1904, I 1 0 340, Patented Feb. 13, 1912.

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WILLIAM C. MEYER, F BOSTON, MASSACHUSETTS, ASSIGNOR TO UNITED SHOE MACHINERY COMPANY, OF PATERS ON, NEW JERSEY, A CORPORATION (IF NEW JERSEY.

SHOE-SEWING MACHINE.

To all whom it may concern Be it known that I, \VILLIAM C. Marne, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Shoe-Sewing Machines; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable other skilled in the artto which it appertains to make and use the same.

The present invention relates to an improvement in sewing machines and more particularly in sewing machines of I the curved hook needle, chain-stitch wax-thread type known welt and turn machines.

In the operation ofthe well-known Goodyear welt and turn machine, illustrated with substantial accuracy in the patent to French and Meyer, No. 412,?0t, dated Octo her 8, 1889, the stitch is set by the take-up which pulls upon the loop of thread standing around the shank of the needle while the latter is in the work thereby bringing the thread which forms the stitch into its final position in the seam. Inasmuch as the tightness of the seam depends upon the tension upon the thread at this time this machine in practical operation has been run under as great a tension as the thread would stand, but this tension has been measured not by the liability of the thread 'to break at this time in the operation of the machine, but by the liability of the thread to break last part of the retracting stroke This is because during the thread pulling stroke of the take-up the thread extends around the soft material of the between substance and the smooth surface of the shank of the needle while during the last part of the retracting stroke of the needle the thread is bent around and reeves slightly through the small throat of the needle so that with the same strain on the liable to break at Thus it will be seen that the would stand during of the needle.

this time.

mined the maximum tension which could be used on the machine and precluded the use of as much tension as was desired, and in tact desirable, to be used during the opera .tion of the take-up. The object of the'present invention is to reorganize and improve the chain-stitch Specification of Letters Patent.

Application filed November 4, 1904.

invention and will Patented Feb. 13, 1912. Serial No. 231,342.

tension mechanism operating to subject the thread to certain tension during the time the needle is making its retracting stroke and to a certain increased tension during the time the take-up is acting to tighten the loop of thread standing around the shank of the needle while it is in the materials.

Other features of the invention will be pointed out in connection with the description of the illustrated embodiment of the be specifically defined in the claims. In the accompanying drawings illustratmg the preferred form of the invention, shown in connection with the well-known Goodyear welt and turn machine which is illustrated with substantial accuracy in the patent ream- 1 to, only so much of the machine is shown as is necessary for a complete understanding or" the present invention and the parts not herein referred to may be, and preferably are, the same as in said patented machine.

Figure l is a side elevation of the machine, unessential parts being omitted. Fig. 2 1s rear elevation and Fig. 3 is a plan showing the tension. device in section.

The illustrated embodiment of the invention is described as follows :The needle N, the take-up T, the auxiliary take-up t, the looper L, the thread finger F, the welt guide G (back gage, in case of a turn machine) and back rest R are constructed, organized and operated in substantially the manner illustrated and described in said patent:- The tension wheel or thread truck JV is loosely mounted upon the st d l secured in the bracket 2 projected rearwardly fro and secured to the rear portion of the head H of the machine. This thread truck 4V may be of any usual construction, the illustrated embodiment thereof consisting of two plates 3 and 4 provided with intermeshing fingers and forming thereby a groove for the reception of the thread which disks or plates are embraced upon opposite sides by plates 5 and 6 clamped together by rivets 7. Mounted upon and secured to the thread truck Wzis abrake wheel 8 which is conveniently secured to the thread truck W by the rivets 7 above referred to, Eelt washers '9 and 10 m I int-r,

' ception of the brake wheel 8 the foregoing construction is substantially identical with the corresponding parts in said patented n1a- The tension releasing lever 16 is conchine. nected by the chain 18 with the bell crank lever 19 which in turn supports the rod 20 by which connection is had with the main shaft of the machine in the manner illustrated in the patent to La Chapelle, No. 488,505, December 20, 1892. The brake wheel 8 is adapted to be borne upon by the brake shoe 2]. provided with a felt face. The brake shoe is carried by the lever .22 pivoted at .28 ina double support 2% projected upward from the tension bracket 2. Theopposite end of the lever 22 is pivotally connected with a rod 25 which passes through a hole in a pin 26 carried by the arm 27 of the cam lever pivoted at .29 upon a stationary part of the machine. The cam lever is provided upon its other arm 28 with a cam roll which enters a cam path in the cam. disk 30 mounted upon the main shaft of the machine. The rod 25 is provided below the pin 26 with an adjusting nut 31 and a set not 32. The rod 25 above the pin 26 is embraced by a spring 38 which bears upon the pin 26 at one end and upon a washer 34 held in place on the rod 25 by a nut 35. The nuts Stand 35 afford means of adjustment.

It has not beenconsidered necessary to illustrate the cam path in the cam disk '30 by means of which the supplemental tension is operated, as any person skilled in the artcould construct the same from the present description without the exercise of more,

. than the ordinary skill of the designer.

tension exerted upon the thread by the trio- The above described. arrangement is such that during the running of the machine the .tion of the felt washers 9 and 10 upon the spring 12, is constant.

tension wheel, owing to the pressure of This tension will be referred to as the normal tension. It'determines the/tensionupon the threadat all times during the operation of the machine except during-those times whenthe extraordinary or supplemental tension is exerted thereon by what will be termed the supplemental tension, which is enerted by the brake shoe 21 upon the brake wheel. '8. This sup-- 7 fplemental tension is timed with relation to the takaup so that it is exerted during the time the take-up 'isrising, that is to say, dur- The washer 11 is providedneedle, and means for exerting an increased tensionupon the thread during the time the take-up is making its thread pulling stroke.

It is to be notedthat it is only essential that the normal tension be exerted upon the thread during the last .part of the retracting stroke of the needle because this is the only time during its retracting stroke when the thread is liable to reeve through the throat of the needle under strain.

plemental tension be applied during that portion of the stroke of the take-up while it is acting to set the stitch.

It is to be observed that while I have described my invention as embodied in a Ina-1; chine 1n which the normal and the supple mental tension are both applied to the thread through the same tension wheel by means of two devices which, the one constantly and the other intermittently, act thereon, my invention is not necessarily limited to such construction as other forms of mechanism might be substituted therefor without departure from the invention. For example, it is not essential to my invention, viewed in its broader aspects, that the spring exerting the normal resistance to the rotation of the tension wheel should act thereon while the supplemental tension is acting. Again, it will be understood that it is within the purview of my invention entirely to dispense withjthe spring 12 and to provide a cam path tor-actuating a single tensionrel-easing device he provided for use I Furthermore, it 15 only essential that the increased or sup tilt lild

in removing the sewed shoe from the machine. This tension releasing device is the same as that described and illustrated in the patent to La Chapel'la' llt will be understood that the intermittently acting supplemental tension is exerted upon the thread only during the time the take-up is rising, and consequently that it is not exerted upon the thread when the needle is back and.

when the parts are in the position which.

be embodied in other and different forms within the purview of my invention as described herein.

lVhat is claimed is l. A chain-stitch, shoe sewing machine, having, in combination, a needle, a looper, a stitch setting take-up, a constantly acting normal tension, and an intermittently acting supplemental tension operating during the stitch-setting movement of the take-up to increase the tension on the thread, substantially as described.

2. A chainstitch, shoe sewing machine, havi-ng,in combination, a needle, a looper, a stitch-setting take-up, a normally operative tension mechanism for exerting a constant tension upon the thread during the operation of the machine, a supplementary ten sion mechanism operative during the setting of the stitch, and means for relieving the constant tension to remove and enter the work, substantially as described.

3. A chain-stitch, shoe sewing machine, having, in combination, a needle, a looper, a stitch-setting take-up, a tension mechanism acting to exert tension upon the thread during the retracting stroke of the needle, and a supplementary tension mechanism acting to increase the tension exerted. upon the thread during the stitch setting movement of the take-up, substantially as described.

4:. A chain-stitch, shoe sewing machine, having, in combination, a needle, a looper, a stitclrsetting take-up, a tension device operating to exert a uniform and relatively light tension upon the thread during the re tracting stroke of the needle and an increased tension during the setting of the stitch, and means for adjusting the tension device to vary the amount of increase in the tension without affecting the uniform and relatively light tension exerted thereby on the thread during the retracting stroke of the needle, substantially as described.

In testimony whereof Iaflix my signature, in presence of two Witnesses.

I WILLIAM C. MEYER.

\Vitnesses:

HORACE VAN EVEREN, ALFRED H. HILDRETH.

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