US727384A - Feeding mechanism for sewing-machines. - Google Patents

Description

PATENTED MAY 5, 1903.

J. KUHLBR.

FEEDING MECHANISM FOR SEWING MACHINES.

APPLIUATION FILED MAY 22. 1899.

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PATENTED MAY 5, 1903.

J. KUHLER. FEEDING MECHANISM FOR SEWING MACHINES.

APPLICATION FILE D MAY 22, 1899.

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PATENT JULIUS KCHLER, OF LIMBACH, GERMANY.

SPECIFICATION forming part of Letters Patent No. 727,384, dated May 5, 1903.

Application filed May 22, 1899. Serial No. 717,792. (No model.)

To all whom it may concern:

ing-machine maker, ofLim bach, Saxony, Germany, have invented certain Improvements in Feeding Mechanism for Sewing-Machines; and I do hereby declare thenature of this invention and in what manner the same is to be performed to be particularly described and ascertained in andby the following statement.

My said invention relates to an intermittent and positive movement ofthefeed-rolls of sewing-machines for joining together hosiery and the like fabrics bywhich I obtain nearly four times the working speed (up to three thousand stitches a minute) as compared With machines hitherto. constructed. In combination with this said mechanical movement I have constructed a special mechanism to vary the length of stitches, which is absolutely necessary to enable the machine to be used forsewingdilferent gages of fabric.

In all sewing-machines for selvaged hosiery the fabric to be stitched passes between two feed-rolls, and in consequence of this a variable motion of the said feed-rolls will also cause a various length of stitches.

In order to clearly describe my said invention, reference is hereinafter made to the accompanying drawings, in which Figure 1 is a side view with parts in section; Fig 2, a plan View of the parts shown in Fig. 1; Fig. 3, a sectional view of a modification; Fig. 4, a plan View of the parts shown in Fig. 3; Fig. 5. a view, similar to Fig. 3, of a further modification.

In order to obtain an intermittent and positive motion of the said feed-rolls, a wormgearing is used, the worm of which, besides being continuously rotated, can bedisplaced longitudinally on its shaft. One part of this longitudinal motion, from the left to the right, is actuated very quickly. It turns the said feed-rolls to the extent of thelength of one stitch. The other part of this said longitudinal motion, from the rightto the left back again, is actuated very slowly and causes the worm-wheel to remain stationary. During this time the stitch-forming parts of the machine are operated to form the stitch. In order to obtain a high speed, it is necessary to have all motions of a positive nature and to simplify the construction as much as possible. I have therefore directly connected the worm g with the eccentric g, so that both form one solid piece.

In order to make the worm g, Figs. 2 and 4, slide longitudinally on its shaft 9 the worm and the eccentric g, directly fixed to the said Worm, have a splined connection with their shaft and a pin h, the stud of which is directly fastened to the plate of the machine,

catches in the said eccentric groove g. The shaft 9 of the worm. and the said eccentric derives a continuous rotation from the main shaft 70, Fig. 1, by means of the equally large worm-wheels m m Fig. l, and nr'fi, Fig. 2, so that the worm g makes exactly the same number of revolutions per minute as the main shaft 70. As the worm g is directly connected with the eccentric g, the said eccentric must thus have the same rotation as the said worm g, and the said worm g with the said eccentric g are slid to and fro on their shaft 9 at every revolution of the main shaft k. Because one part of the longitudinal movement of the worm 9 causes the worm-wheel cl to remain stationary this rotation of the said worm-wheel d is stopped regularly at each revolution of the main shaft 7a to allow the needle to penetrate the fabric and the stitch-forming mechanism to form the stitch. As this operation requires some time, it is necessary that during one revolution of the main shaftk the worm-wheel (Z, and in combination with it the feed-rolls of the machine, should remain stationary a longer time than is required to move the said feed-rolls to the extent of the length of one stitch. This arrest of the worm-wheel dis depending of the form of the eccentric 9, Fig. 2, without influencing the regularity of the intermittent movement of the said feed-rolls. By the means just described I obtain a regular intermittent motion of the said feed-rolls,which also is of a positive nature.

In combination with this aforesaid mechanism or mechanical movement of the feedrolls of sewing-machines I'have constructed a special mechanism to vary the length of stitches to enable the machine for sewing different gages of fabric.

The Worm-wheel d, Figs. 1 and 2, does not directly impart its motion to the back feedroll a, Fig. 1, but is connected with a cogwheel t,which imparts the motion of the wormgearing g d to the shaft 0 of the said back feed-roll a by means of the gearing s and r, Fig. 5. The gear 8, Fig. 5, is fixed to a lever M, Fig. 4, which can be turned on the pivot of the worm-wheel cl. In order to always remain in its right position and to obtain the proper gear of the cog-wheels s and r, Fig. 5, the said lever u is fastened on its other end by a thumb-screw p. When altering the stitch, the cog-wheel r, Fig. 5, must be taken otf'to be replaced by another one, and the lever u must be turned according to the size of the cog-wheel r to allow the cog-wheels s to gear with this said wheel '2".

Instead of taking the wheel 1' oif and replacing it by another one the following two ways of simplification are possible:

First, on the shaft 0 of the-back feed-roll a, Figs. 1 and 2, three or more cog-Wheels r r 4", connected to each other and of differentdiameters, are mounted so that they can be displaced higher or lower. Each of these cogwheels 1" r r may be provided with a ring or die q. The lever a in this case is provided with a projection u, and instead of being kept in position by a thumb-screwp, Fig. 4, it may be pressed by means of a spring a on the disk or ring q of the then acting wheel '1" r W, so giving the exact distance between this acting wheel 4" r r and the pinion .9. When altering the length of stitch, the cogwheels 1" r r must be placed in such a'position that the pinion or gear 8 gears with the wheel at the time required. The spring a presses the lever 21, and the gear 3, which is mounted on said lever tt, always in the right position, so that never too much nor too little friction is caused, because the projection u of the said lever it, sliding on the ring or disk q of the acting wheel "I" or r r fixes the distance of the gearing.

Second. Three or more cog-wheels 1" 7* r Figs. 3 and 4, are fastened steady to the shaft 0 of the back feed-roll a, so that the largest wheel is at the top. The pinion or gear 3 in this case is displaceable on its shaft and is made just as broad as the wheels 7" r r on the shaft 0 together. This said pinion s rotates around a bar 8, the position of which as regards being placed higher or lower may be altered on the bolt of the lever 11.. If it is required to change the stitch, the thumb-screw 19, Fig. 4, is loosened and the lever u is placed aside as far as it is required to allow the pinion 8 to be placed so that it will gear with the acting wheel r or 1" r Having done so, the lever u is fastened again. The pinion 3 being as thick as the cog-wheels r r r together, the gearing cannot get lost.

By the construction and arrangement of parts hereinbefore described all the motions are of a positive nature. There is thus no dependence on springs or their resilient action, and as a consequence a very high speed and a quiet and steady action are attainable.

Having now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 1. In combination, the feed-rolls of a sewing-machine, a continuously-rotating worm g which is also longitudinally movable on its shaft, a worm-wheel d gearing with the said worm, 850., connections between the worm and the feed-rolls and an eccentric g directly connected with the said worm, the worm and said eccentric having a splined connection with their shaft, means for driving the shaft, and a pin h for moving the worm longitudinally on its shaft, to impart a positive intermittent motion to the feed-rolls of sewingmachines, substantially as described.

2. In combination, the feed-rolls of a sewing-machine, a continuously-rotating worm g which is also longitudinally movable on its shaft, a worm-wheel d gearing with the said worm, 850., connections between the worm and the feed-rolls, and an eccentric g directly connected with the said worm, the worm and said eccentric having a splined connection JULIUS KoI-ILER.

Witnesses:

EUGEN NUBUL, J. G. MONAGHAN.

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