US1909581A - Power transmitting mechanism - Google Patents

Description

May 16, 1933 c. w. HDOUBLER POWER TRANSMITTING MECHANISM Filed Sept. 17, 1930 i i Patented May 16, 1933 i ,i

UNITED STATES PATENT OFFICE CHARLES W. HDOUZBLER, OF SPRINGFIELD, MISSOURI '.POWER TRANSMITTING MECEANISMI Application led September 17, 1930. Serial No. 482,555.

This invention relates in general to im- A further specific object of the invention is provements in power transmitting mechato provide improved mechanism for driving nisms, and relates more s ecitically to imand for effecting manipulation of devices for proved mechanism especia ly applicable to winding cord or thread upon a spool, reel,

electrically operated sewing machines, the bobbin or the like. 55 present invention constituting an improve- With the .above and other objects in view, ment upon certain features of the invention which will become apparent as the descripcovered by my former Patent No. 1,472,588 tion proceeds, the present invention comgranted October 30, 1923 relating to Elecprises the improved power transmitting trically driven sewing machines. mechanism especially applicable to electri- 50 A general Object 0f the invention is t0 pro- Gally Operated Sewing maClliIieS SllbStaDtially vide improved power transmitting mechaas set forth in the claims and all equivalents nism which is simple.. and compact in conthereof. struction, and which is moreover highly et'fi- In the accompanying drawin the same cient in operation. Itis also a general obreference characters designate te same or 35 j ject of the invention to provide improved mosimilar parts in the several views: tion transfer mechanism which is especially Fig. 1 is a side elevation of that portion of applicable to power driven sewing machines the improved electrically operated sewing or the like. machine which relates to the present inven- While some of the prior electrically opertion, parts having been broken away to more 70 ated sewing machines are relatively eiicient clearly show the interior structure; in operation, the motor is usually so disposed Fig. 2 is a fragmentary view looking at that the general appearance of these machines the bottom of the machine with a portion of is unsightly and distorted, due to having the the bottom cover broken away to more clearmotor attached as an appendage. Aside from ly show the interior structure, the view being 75 this defect all sewing machines now on the taken at right angles to that shown in Fig. 1; market have an excessive number of moving and parts exposed at the exterior of the machine. Fig. 3 is a side elevation of the improved It is, therefore, one of the more specific obbobbin. v

ject-s of the present invention to overcome Referring to the drawing, ythe numeral 4 90 these objectionable features of the prior Inaindicates the frame of a sewing machine. chines and to provide an electrically operated An electric'inotor 5 is positioned centrally sewing machine of unitary structure with the within the lower portion of the frame 4, and motor concealed .entirely within the confines surrounds a horizontal drive shaft 6, the iield of the frame. portion 7 of the motor being supported con- 95 A further specific object of the invention centrically of the shaft, between two lugs 8 is to provide a power operated seWing-maby means of screws 9.

chine having concealed and readily manipu- The armature 10 of the motor 5 is supportlable means for operating 'the bobbin .re-A ed upon a tubular shaft 11 which is provided winding spindle. at its forward end with an annular groove 12 9 Another speciiic object of this invention is and a clutch member 13, this tubular shaft to provide a means for permitting substantial 11 being journaled directly upon the drive concealment of the bobbin rewind device of shaft 6.

a sewing machine within the frame when A corresponding clutch member 13 is also not in use. journaled on said drive shaft adjacent to and 9 Still another specific object of the invensuitably disposed for engagement with the tion is to provide a bobbiln that will autoclutch member 13, the clutch member 13 matically take the thread, without the necesbeing provided with an oil throwing disk 14. sity of first startingr the thread by hand windand with an integr l tubular sleeve 15 which ing as in the prior machines. supports a pinion 16. The pinion 16 meshes 100 with a gear wheel 17 supported upon an integral sleeve extension 18 of a pinion 18 which is journaled upon a counter shaft 19. The pinion 18 meshes with another gear wheel 20 which is attached to the drive shaft 6 by a pin 21 or in any other suitable manner.

It now becomes apparent that when the two clutch members just described are engaged, as shown in the drawing, rotary motion may be transmitted from the armature 10 to the drive shaft 6 at a redctermined lesser speed of rotation than that of the rotary speed of the armature, and that the armature and the shaft w'ill travel in the same direction of rotation with minimum friction losses.

The armature 10 of the motor is also provided with a commutator 22 in which the segments are elongated to permit the armature to be slid back and forth on the drive shaft 6 without interrupting contact with the carbon brushes 23 sup rted in the brush holders 24. These brus holders 24 are retained in slotted lugs 25 by means of screws 26, contact between said brushes and the field coils 27 being had through the medium of metal clips 28 which are gripped by the metallic portions of the brush holders 24 and are attached to the Iield lead wires 29.

Another clutch member 30 is secured to the commutator end of the armature so as to cooperate with a corresponding clutch member 31 provided with an extending flange portion 31 mounted in any suitable manner on the front side of a pinion 32. The pinion 32 is slidably supported upon the drive shaft 6 and meshes with a gear wheel 33 secured to a shouldered shaft 34. The shaft 34 is journaled in the frame 4 and has a split, resilient spindle-like end 34 protruding at the back of the standard portion of the frame 4. The split end 34 of the spindle is adapted to drivingly engage the bobbin 35 by yielding lateral pressure of the bifurcations, during winding of the bobbin.

Owing to the confined location of the winding spindle in the present invention, it would be diicult to start a bobbin preparatory to winding, by the usual method of Iirst giving the thread a few turns around the bobbin stem by hand in order to give the thread a grip on said stem. A short slot 35? is therefore provided in the rim of one side of each of the bobbins 35 to automatically enga the thread as will be hereinafter explain the 55 moment the bobbin is rotated.

To facilitate winding of the bobbins, a headed pin 36 is provided for conveniently supporting the thread supply spool. The s l supporting pin 36 may be mounted in tiigowall of the standard portion of the frame 4, in such manner that it may be easily pressed back into the standard when not in use, or the pin may be readily withdrawn when required, being restrained against complete withdrawal by a small peg 37 extending through the pin near its inside tension thread guide is also guide consisting of two flange 38 loosely mounted on a headed pin 39 su ported by a lug 40 at the back corner of t e bed-plate portion of the frame 4. Tension is imparted to the thread passing over the guide, by means of a light coil s ring 41 encircling the headed pin 39 and) yieldingly en aging the lug 40 and the inside disk 38 t should now be apparent that in order to operate the bobbin winding spindle 34', it is only necessary to shift the connections from the clutch in front of the motor to the clutch at the rear thereof, and to accom lish this, a properly formed lever 42 is provided. The lever 42 is pivoted to the frame b a shouldered screw 43 and is provided wit 1 a pin 44 rigidly supported and so positioned as to centrally engage the annular groove 12 in the end of the tubular armature shaft 11. The arrangement is such that the lever 42 may be o erated from the top of the bed or sewing ate by means of an upright handle 45 whic 1 is supported on the disengaged end of said lever 42, the handle being just long enough to penetrate the sewing plate through a slot 46 provided in said plate. Throwing the lever 42 back, slides the armature backward through the medium of the pin 44, and thereby disengages the front clutch members and engages those clutch elements which opcrate the bobbin winding device at the rear, and, of course, vice versa.

s a means for yieldingly support-ing the lever 42 and to hold either predetermined set of clutch members in engaged position, a flat spring 47 is secured to the frame by a screw 48; said spring being formed and positioned to produce yielding pressure a ainst the lever. The spring 47 is adjustab e as to pressure, by means of an adjustment screw 49; and the spring is also provided with two slight V-shaped indentures 47 running crosswise thereof and so positioned that the two angular detents formed by the said indentures on the opposite side of thc spring will simultaneously yieldingly engage the two edges of the lever.

The well known tendenc of the magnetic field portion of a motor to raw the armature toward its true magnetic center relative to the field, assures positive functioning of the forward clutch members 13 and 13 so that irrespective of whether the coo rating jaws on the clutch members interloc at the time the lever 42 is thrown forward, these jaws will be forced into interlocking position by the magnetic action when the armature begins to rotate, and thus pull the end of thc lever 42 into the yieldingly retained position betliveenQthe detents on the spring 47 as shown m 1 Toginsure similar functioning of the rear clutch members 30 and 31, a short coil spring extremity. A rovided, this disks 38 and 50 is introduced around the shaft 6 between and abutting a bearing 51 and a flange 52. The flange 52 is secured to the pinion 32 in any suitable manner and cooperates with the flange portion 31 vto retain the pinion, which is loosely journaled on the shaft-6, always in' mesh with the ear wheel 33. When a rearward pressure 1s brought to bear against the leverk handle the yielding resistance of the spring 47 will be overcome, and the armature will slide rearwardly upon the shaft 6 by means of the pin 44 engaging the annular groove 12. This `rearward shifting of the armature of the motor will disconnect the front set of clutch members 13, 13 and will cause the clutch member 30 to be pressed into engagement with the clutch member 31, thereby compressing the coil spring 50 so that in case the detents of the clutch members should not exactly register when brought together, the coil spring will positively establish a driving connection when the armature is rotated.

Winding of a bobbin is accomplished by first throwing the lever 42 backwardly in the manner just described, thereby interrupting the driving connection with the sewing mechanism, and, by the same act, establishing a driving .connection with the bobbin winding device. The headed pin is then drawn outwardly to its eXtreme position, and the spool of thread is slipped onto the pin. The loose end of the thread is then drawn around the pin portion of the thread guide between the two disks 38, 38 and back under the stem of the bobbin 35 and held upright and rearwardly by hand, to cause the thread to bear against the edge of the rear or outside flange of the bobbin. The motor is then started and the first revolution of 'bobbin causes the thread to enter the peripheral slot and thereby causes the bobbin to begin windmg.

When the bobbin has been sufficiently wound or supplied with thread, the thread may be severed and the bobbin freely removed from the bifurcated end of the shaft. 34, the resilient bifurcations ofwhichprovide a frictional driving connection during the'winding operation. After the spool of thread has been removed from the pin 36, this pin may be pushed into the frame 4, thus concealing the pin. The lever 42 may then be shifted forwardly to re-establish the driving connection between the forward clutch members 13, 13 and to simultaneously interrupt the driving connection between the rear clutch members 30,31.

From the foregoing description, it will be apparent that the present improvement provides an extremely simple, compact and conveniently operable ypower` s transmitting mechanism for im arting motion from the driving motor to t e bobbin winding device of a sewing machine. The formation of the bobbin 35 with a peripheral notch 35 in one of the side flanges thereof, provides simple and effective means for starting the thread winding, and the improved guide wheel insures uniform distribution of the thread upon the bobbin hub.

It should be understood that it is not desired to limit the invention to the exact details of construction herein shown and described, for various modifications within the scope of the appended claims, may occur to persons skilled in the art.

IVhat I claim as my invention is:

1. In combination, a driven shaft, a motor for driving said shaft, said motor comprising an armature surrounding and movable along said shaft, means when the armature is in one position for transmitting motion from said armature to said shaft and rotating said shaft at a certain speed of rotation, means journaled on said shaft and when the armature is in another position for alternately transmitting motion from said armature to another source of power utilization at a different speed of rotation, and means for moving the armature longitudinally on the shaft. 2. In combination, a driven shaft, a motor for driving said shaft, said motor comprising an armature surrounding and movable along said shaft, means at one end of said armature and when the armature is in one position for transmitting motion therefrom to said shaft, means journaled on said shaft at the opposite end of said armature and when the armature is in another position for alternately transmitting motion from said armature to another source of power utilization, and means for moving the armature longitudinally on the shaft.

3. In combination, a driven shaft, a motor for driving said shaft, said motor comprising an armature movable along said shaft, means for transmitting motion from said armature and when the armature is in one position to said shaft at lower speed than that of said armature, means disposed .concentrically of said shaft land when the armature is in another position for alternately transmittin motion at another speed than that of sai armature to another source of power utilization, and means for moving the armature longitudinally on the shaft.

4. In combination, a driven shaft, a motor for driving said shaft, said motor comprising an armature embracing said shaft and mov` able longitudinally thereon, means including a clutch for transmitting motion from said armature to said shaft when the armature is in one position, means including another clutch for alternately transmitting motion from said armature to another source of power utilization when the armature is in an other position, and common means for controlling the movement of the armature and the operation of both of said clutches.

5. In combination, a dri-ven shaft, a motor for driving said shaft, said motor comprising an armature embracing and movable along said shaft, means includindg a clutch 5 for transmitting motion from sai armature to said shaft, means including another clutch for alternately transmitting motion from said armature to another source of power utilization, and a lever for moving said armature l0 to control the actuation of both of said clutches.

6. In combination, a driven shaft, a motor for driving said shaft, said motor comprising an armature surrounding and movable along said shaft, means for transmitting motion from said armature to said shaft, means for alternately transmitting motion from said armature to another source of power utilization, a lever for moving said armature along said shaft, and means for utilizing the magnetic field of said motor to place said lever in a Iredetermined position.

7. n combination, a driven shaft, a motor for driving said shaft, said motor comprising an armature movable along said shaft,

means at one end of said armature for transmitting motiontherefrom to said shaft when the armature is in one position, and a resiliently restrained clutch adjacent the oppoa site end of said armature for alternately transmitting motion from said armature to another source of power utilization when the motor is in another position, and means for moving the armature longitudinally on said shaft.

8. In combination, a driven shaft, a motor for driving said shaft, said motor comprising an armature surrounding and longitudinally movable on the shaft, means when the armature is in one position for transmitting motion from the armature to the shaft to cause said shaft to rotate at a slower rate of speed than the armature, means when the armature is in another position and the shaft is at rest for transmitting motion to another source of power utilization, and means for nlllotng the armature longitudinally on said s a p 9. In combination, a driven shaft, a sleeve journaled and longitudinally movable on said shaft, a motor for driving said shaft comprising an armature mounted on the sleeve i and movable therewith, means co-acting with l one end portion of the sleeve when 1n one position on the shaft for transmitting motion from the armature to the shaft, other means co-acting with the opposite end portion of the sleeve when in another position on the shaft for transmitting motion from the ar- 00 mature to another source of power utilization, and means for moving the sleeve and the armature longitudinall on the shaft.

In testimony whereo I alx my signature.

05 CHARLES W. HDOUBLER.

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