USRE15051E - William gentry shelton - Google Patents

Description

W. G. SHELTON.

szwms MACHINE MOTOR.

APPLICATION FILED NOV- 2511919. Reissued Feb. 22 1921.

UNITED STATES WILLIAM oim'rnr snnnron, or NEW YORK, N. Y.

SEWING-MACHIN E MOTOR.

Specification of Reissued Letters Patent. Reissued Feb, 22, 1921,

Original No. 1,247,732, dated November 27, 1917, Serial No. 166,787, filed May 7, 1917. Application for reissue filed November 25,

To all whom it maiy concern:

Be it known that I, WILLIAM GENTRY SHELTON, a citizen'of the United States of America, residing in'the borough of -Manhattan, city, county, and State of New York,

have invented certain new and useful Im-' provements in Sewing-Machine Motors, of which the following is a specification.

The objectvof this invention is to provide an electric sewing machine motor continuously rotatable in one direction which is so vation, applied to the driving wheel of a sewing machine, the outline of such driving wheel, sewing-machine arm and table being shown in this view;

Fig. 2 is a View showing the motor in ele vation, part' of its frame being broken away and its pulley applied to the pulley or driving wheel of a sewing machine, the point of application being on the side opposite to that represented in Fig. 1, and

Fig. 3 is an elevational view of the moto and a portion of the pulley or driving wheel at substantially right angles to that of Fig. 1, looking at this from the right-hand side.

Considerable difiiculty has been experienced in sewing-machine motors heretofore in use owing to the fact that some sewing machines are driven in one direction-of rotation and some in the other at the oint of to application of the electric driver. his has necessitated the use of reversing switches, or, in some instances, shifting the pulley from one end of the armature shaft to the other. A motor built according to my improvement is capable of application, without any change in its working parts whatsoever,

. to either side of the driving pulley of the sewing machine for the purpose ofeffecting drive in opposite directions. Certaln of the parts of a sewing machine are shown in outline in the drawings, there being a table a 5 shown supporting a conventional form of head 6 in, which is mounted ahorizontally disposed shaft 7 carrying a-wheel 8. This wheel, as is well known, is called by various Figure 1 shows my improved motor in ele-,

1919. Serial No. 3 10,6405.

names, according to the viewpoint of the one mentioning it; It serves the purpose, of course, of a fly-wheel, a hand-wheeh, and, in the present connection, a driving-wheel. For the purposes of simplicity this wheel 8 will be referred to as a pulley or driving pulley. The motor casing 9 is shown piv-- otally mounted upon a standard 10; having a base 11 resting upon, and preferably frictionally engaging, the sewing machine table 5: The pivots 12 are shown connected to the motor casing 9 nearer the pulley end than the other end of the casing whereby the gravity of the casing has a tendency to hold this in an upright position with the armature shaft 13 1n a substantially vertical position. A. pulley 14 is shown mounted upon the armature shaft 13. This pulley is made of some suitable material to driv ingly engage the pulley '8 of the sewing machlne. The wheel 8 in most sewing machines is provided wlth a rounding contour, and g the pulley is shown concaved to securely engage and conform tothe shape of the member which it engages. It has heretofore been thought necessary to provide a comparatively'large low-speed motor for driving a sewing machine by a frictional en-' gagement with the pulley 8. The size of the motor has in some respects controlled the point of application of the driving pulley. I have discovered that a small high speed motor is very eflicient in this connection and that, owing to the smallness of the motor, it is possible to have this'90 located when in use practicall y under the pulley 8 or between such pulley and the sewing machine table 5. By this means the tractive engagement takes place at the side of the pulley 8 and the motor automatically slows down to the requirement. of itsuse. Of course, the employment of afoot-com trolled rheostat inconnection with power motors of various kinds is so. well known that specific illustration and description in on the present instance is unnecessary.

The force of engagement between the pulleys 8 and 14 may be provided for by varying the amount of metal in the lower part of the motorcasing, as, for instance,- by 'putlob ting the right amount of metal in the hub' 15 at the end of the casing opposite the pulley. A cable 16 leading the current into the motor is also shown entering at the lower, 3 end of the casing, which also adds to the tendency of the motor to assume an upright posltion. In some instances it may be found desirable to apply spring pressure, a conmotor is as follows: Assuming that the motion of the sewing machine in Figs. 1 and 3 of the illustration is in the direction of the arrow 8 and the motor is built to run as indicated by the arrow 14 from left to right, then the manner of applying the motor is to place the left-hand side of the motor pulley 14 against the right-hand side of the pulley 8 in Fig. 1. The weight of the various parts then has a tendency to, bring the pulleys into suflicient driving engagevment. can, of course, be augmented in various ways.

This weight, as above explained,

. If it is desired to operate the machinewith the motor tl 1us,.ap'plied, it is merely necessary to permit the proper amount of electric current to enter the motor. If the correct direction of rotation of the sewing machine is in the direction of the arrow 8", the manner of applying the motor is merely to swing it on its pivots 12 and press therighthand side-of thepulley 14 against the lefthand side of the pulley 8, see Fig. 2. This, then, with the driver still running in the same direction, "will deliver the correct rotation to the sewing machine. In either of theseapplications of the motor it will be seen that the motor is capable ofoccupying for causing the armature shaftto normally a position substantially beneath the pulley 8."

@ Although but onepracticable embodiment of the invention is illustrated, yet it will be apparent that various changes may be made within the scope of the claims without de arting from the spirit of the invention.

hat I claim is .1. A sewing machine motor comprising a support for resting upon and..-frictionally engaging the table of a sewing machine, an

electric motor, pivotally mounted onsuch support, and means acting upon the motor assumea substantially vertical position, and

apulley carried by the armature shaft forengagingthe driving pulley of the sewing:

machine; p 2. A sewing machine motorcomprising a support for restingupon and frictionall'y engaging the table of a sewing machine, an

electric motor, rotatable fin one'direction; and pivotally-mounted on such support, and

vertical position, and a pulley carried by the armature shaft for engaging the driving pulley of a sewing machine.

4:. A sewing machine motor comprising an electric motor rotatable in one direction, a

support to which the motor is pivotally mounted, the pivotal point being above the center of gravity of the electric motor and the parts being so proportioned that the armature shaft normally assumes a vertical position, and a pulley carried by the armature" shaft for engaging either side of the driving pulley of a sewing machine for effecting rotation in the desired direction.

5. In a sewing machine motor, the combination with an electric motor provided with a casing, a support therefor, pivots carried by the motor casing at a point above its center of gravity and mountedin said support, the armature shaft being adapted to assume a vertical position incident to gravity, and a pulley mounted upon said armature shaft for engaging the driving pulley of a sewing machine. 6. A sewing machine. motor according to claim'5, having means acting on the motor casing for augmenting the actionof gravity.

7. In combinationfwith the, sewing machine motor of claim 5, a spring acting on the casing for urging the armature shaft toward a vertical position.

. 8. A sewing machine motor comprising a motor having a driving pulley and a support, said motor having a pivotal mounting on said support, said driving pulley having its axis at an incline and adapted to swing toand from'the side of the hand wheel of a sewing machine, andvmeans for pressing of the crown thereof.

pivotally mounted motor, with a driving pulley, and meansv adapted to press said motor around its pivotal axis, in a verti ing wheel of a sewing machine on one side 9. A sewing machine motor comprising a' callyinclined position, against the driving I wheel of aysewing machine the pulle 7 axis? motor .su stan- 1 and, said pivotal axis of the tially intersecting.

q I 10. A sewlng machine motor comprising I a pivotally mounted motor with a driving 1 rection of rotation of said motor.

11. A sewing machine motor comprising a support and a motor pivotally mounted on said support, said motor having a drivingpulley, and being movable around said pivotal axis to bring said driving pulley against one side or the other of the driving wheel of a sewing machine, whereby said sewing machine driving wheel may be driven in one direction or the other, as may be required, without reversing the direction of rotation of said motor.

12. A sewing machine motor comprising a support and a motor pivotally mounted on said support, said motor having a drivin pulley, and being movable around sai pivotal axis to bring said driving pulley against one side or the other of the drivin wheel of a sewing machine, whereby said sewing machine driving wheel may be driven in one direction or the other, as may be required, said support and motor having a combined weight sufficient to maintainit in frictional contact with the table of a sewing machine during the running of the motor.

13. A sewing machine motor comprising a support, and a motor, a single pivotal connection between said motor and support, and means adapted to press said motor around its pivotal axis, in an inclined posi-' tion against either side of the driving wheel of a sewing machine, whereby said driving wheel may be drivenin one direction or the other without reversing thedirection of rotation of said motor.

In witness whereof, I have hereunto signed my name.

WILLIAM GENTRY SHELTON.

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