US1556688A - Motor attachment for sewing machines - Google Patents

Description

Patented Oct. 13, 1925.

frosrnn F. HIL L IX, .or c EvELAitn "onto, vassIeiiion", To, wnlrni snwme COMBQANTYQ F L VEI AN r .1 );v s QOB'RQBATIQNI QF OHIQE mcronsarrncniwnnmroasnwme meenmnsg Applicationrfiled' April-.15,

To. all whom itmay. concern: I

Be it known that I, Fos'rnn F. H ll-LIX, a citizen; oft-he; United. States, residing-at Cleveland, in the county of Guyahcgafand State of; Ohio, have/invented acert'ain new and useful Improvement in MotonAttache ments for. Sewing Machines, of which. the following is 2 a full, I clear. andv exact description.

This invention relates to motoriattachr ments for sewing machines and has t'or its object the; provision of. anew. mounting or manner of supporting the =motor; from the head by which an exceed in gly simple motor support may be ut-ilizedwvhichat the-same time brings about a; very compact. arrange ment, and-an exceedingly eflicient drivingz relationv betwee'nithe friction driving-pulley. of the motor and the hand heelof the sewing machine head. Y i f g v A further. object is;t'o provide amounting which isespecially adapted for;sewingv ma? chines of the portable type, the mounting being of such a nature; that when the motor is supported on thehead it does not project outwardly beyond the.;-b.a se -;so.- as to. require any change in or enlargement: OfE'l'llG. case whichis designed to be-fitted 0ver .-t-he head. Still urther5the invention aims to provide a mounting wherein the friction driving pulley of the. motor may be maint-ained in good -.driving relationship with the hand wheel of the head; and .which candoe ad.- justedit conditions require, to vary the pressure between the pulley and hand wheel without altering the position.ofsthcmotor, or requiring't-he use of springs: to. cause the desired frictional engagement between the pulley and hand wheclt Stillfurther the invention aims to provide a driving. pulley which has a yieldable. fi ic tional driving. portion ,w hich maintains-its shape'under high speed conditions andlpossesses toa very high: degree the feature of durability. v i e The invention may be. briefly summarized as consistingin certain novel details of; construction and. combinations and arrangements. of. parts which willlb'e described ill-.tli specification and point ed out inrthe append ed claims.

In the accompanying sheet of'drawings wherein I have shown that embodiment of my invention wherein-the attachment. is appliedto a so-called portal-file sewing machine,

1922. swarm. 5149, 830

Fig. 1' is a rearviewofiathe machine with the motor applied; in drlving relation to the andwhe lgpartsbeing in sectionyllig. Q S an end; viewlooking toward the right of Fig. 1.; Fig. 3zisa detail.-v-iew showingi'n section. the.frictiondrivingpulley Eig; 4 is a face: view of? the a bracket by. which the motor is: attached to the; en'dof the head; gszasect onal view t rough hebmc let alongthel'ine 5 5:ot Fig.4, showingaportionof the head to. which the bracket is; atachedyand: Fig p a iew: o he bracket: attached to't'the" headta portion of the latter being shown in section.

l efi rr ngi to he raw-ings, 1c .repr sents .the upright: portion of: the; arm of the head-of-thesewing machineand 1 1' the' liorizontal; portiom. Likewise-'12 represents the hand. wheel: and 13 the wooden base upon which the hea'dis mounted, the1sewingzmachine. shown" being standard. sewingfmw chineiof the portablegtype, which when not in use is; adapted to: be enclosed. in; a case, and when 1 in use; is supported on, a; table or other convenientsupport,

For the purpose ofielectrically' drivingthe sewing machine, I provide. In improved motor attachment which .incln esia small electric motor 14. ;In.this.instance the motor is mounted on the lpr-i ght. portion 10 of the arm of the. head, and itiisarranged beneath the hand wheel alongside. the .end of the head; slightly to: the: rear thereofi. o Further, it will ;be :noted that the motora isssupported in inclined position-iwith 'its axis. in. an. in"- clined line which 1 intersects rand is at, right angles to the axis of. the; shaft on which the hand wheeli12 is mounted. To. bring; this about the lowerendlof motor is 6X- tended. slightly into a ,recess 1j3f of the .base in. order-.tliat a motor 1 of. the size having sufficient. power. to. drive .th emachine at high speed .may be positioned as shown; A

furtheraadvantage, of .this feature lies in; the fact that a v,rlieostat. may. be employed with this. motorv located; in. the base without; reqniring any external conductors to connect the motonto the'r-heostat. I

By reference to 1' and 21 it; willtbe observed. that. no. partoi'the motor projects beyondtlieontlineor. confines ofthevbjase .13, so that :itloecomes' iinnecessary to enlarge-the caseeinwhichthelhead of the machine. is designed to; be enclosed when thee machine is not in use. i

llO

This arrangement of the motor allows for an exceedingly simple but efficient supporting or attaching means between the motor and head. This is in the form of a bracket 15 which is preferably formed of sheet metal, though it may be formed of cast metal, for with the pulley referred to presently, the bracket need not be of spring material. This bracket has a portion 15 which lies flat against, and is secured to the head, and in this instance to a flat boss 10 cast on the end face of the upright portion of the head a short distance above the base 13. This bracket is preferably secured to the boss by a single screw 16 passing centrally through the portion 15 of the bracket, and the bracket is then held from turning on the boss by a pair of tongues 15 which are bent inwardly into notches at the top and bottom of the boss 10*. Additionally the bracket is provided with a laterally offset and downwardly extended portion 15 which is secured to the frame or body of the motor.

In this manner the motor is effectively supported by a bracket which can be pro duced inexpensively, and which may or may not be of spring material, with the driving member of the motor in proper relation to the hand wheel.

The driving means between the motor and hand wheel is in the form of a tapered friction pulley 17 which is secured on the upper end of the motor shaft 18 in the manner shown in the drawings, the pulley being tapered and engaging the outer side face of the hand wheel rim. It will be obvious therefore, that a proper driving relation between the motor and hand wheel can be obtained by adjusting the pulley lengthwise of the motor shaft and then by securing it in place by means of a set screw 19 or equivalent means. The adjustability of the pulley is particularly useful when a rigid bracket is employed, or if the bracket is formed of spring or elastic material when the spring or elasticity is not relied on to hold the pulley in engagement with the hand wheel.

As a further feature of this mounting I have provided a pulley which has noiseless driving engagement with the hand wheel, and which is capable of years of use without requiring replacement, and very little, if any adjustment lengthwise of the motor shaft. The pulley here shown is composed of a body portion 17 of rubber whose out-er periphery is tapered as shown. In forming this pulley opposite sides thereof are squeezed and held between a pair of disks 17 and 17, the former being larger than the latter, and both being preferably concaved inwardly somewhat, substantially as shown in Fig. 3. In this instance the body of rubber 17 and the clamping disks 17 and 17 are slipped onto a sleeve 17 of a size which will fit onto the motor shaft 18, this sleeve having at one end a shoulder or enlargement 17 through which the set screw 19 passes. In assembling the parts the disk 17 is first slipped onto the sleeve and is moved up against the shoulder 17 Then the body of rubber and larger disk 17 are slipped onto the sleeve and the disks are clamped together and the smaller end of the sleeve opposite the shoulder 17 e is peened over or expanded as shown at 17 to hold the parts in their proper relationship.

The clamping pressure produced on the rubber by the disks 17 and 17 bulges out the rubber between the disks and puts it under tension. Then the periphery is cut off, leaving a flat tapered surface which is designed to engage the handwheel 12. By so forming the pulley, inasmuch as the driving surface is under tension, and has a nat ural tendency to move inward the inherent stresses in the rubber'resist the action of centrifugal force, and as a result the rubber will not bow outwardly and be displaced by centrifugal force when the motor is operated at high speed. Additionally a very durable wear resisting driving surface is provided.

While I have shown the preferred construction, modifications may be made in the arrangement of certain of the parts without departing from the spirit and scope of my invention. For example, the main features of the mounting may be employed without employing a tapered pulley, and a driving pulley construct-ed on the principle of that described above may be utilized advantageously with the motor supported on the arm in a different position with respect to the hand wheel.

Having described my invention, I claim:

1. In combination with a sewing machine having a head with a hand wheel, a motor, and a bracket securing the motor to the head, said motor having a tapered pulley frictionally engaging the hand wheel and secured on the motor shaft so that it may be adjusted lengthwise thereof to vary the pressure of the pulley on the hand wheel.

2. In combination with a sewing machine comprising a head having a shaft and a hand wheel, a motor attachment comprising a motor supported from the head with its axis at substantially right angles to the axis of the shaft and hand wheel and having a tapered friction driving pulley engaging the hand wheel and secured to the motor shaft so that it may be adjusted lengthwise thereof to vary the pressure between the pulley and hand wheel.

In testimony whereof, I hereunto aflix my signature.

FOSTER F. HILLIX.

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