US1270929A - Presser-foot mechanism for sewing-machines. - Google Patents

Description

A. H. DE VOE.

PRESSERVFOOT MECHANISM FOR SEWING MACHINES.

APPLICATION FILED SEPT. 2. m5.

Patented July 2, 1918.

WITNESSES: 1 A l/I/l/E/VTOR 7; 4 23 J57; /4 M m: noRRrs PETERS ca, mom-Limo" WASHINGTON. n. c

ADBERT H. DE VOE, 0F WESTFIELD, NEW JERSEY, ASSIG-NOR TO THE SINGER MANUFAC- TUBING COMPANY, A CORPORATION OF NEW JERSEY. V

JERE$SEB-FOOT MECHANISM FOR SEWING-MACHINES.

Specification of Letters Patent.

Application filed September 2, 1915. Serial No. 48,594=.

To all whom it mag concern:

Be it known that I, ALBERT H. Dn Von, a citizen of the United States, residing at Westfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Presser-Foot Mechanisms for. Sewing-Machines of which the following is a specification, reference being had therein to the accompanying drawings.

This invention has for its primary object to provide means for fully controlling the position of a sewing machine presser-foot from beneath the support of the sewing ma chine in order that the hands of the operator may be entirely free for the adjustment and other manipulation. of the work.

In its preferred embodiment, the machine is provided with a spring-pressed presserbar having fixed thereon a collar affording a shoulder to receive the thrust of a loose sleeve also applied thereto and actuated by a lifting rock-lever operatively connected with a treadleor knee-lever eneath the work-table and constituting the primary presser-bar lifting means. The sleeve is provided with a lateral stud to aflord a shoulder for engagement with either of two cam portions or a detaining shoulder of a finger-lever preferably adapted to serve not only as a detent but as an auxiliary lifter for raising the sleeve and with it the presser-bar independently of the primary lifting-lever.

The finger-lever is fulcrumed below and intermediate its extreme lateral positions and is formed witha slot embracing the lat eral stud ofthe sleeve with one substantially straight cam-edge in tangential relation with an imaginary circle concentric with its fulcrum and normally restin upon the said stud. .Thus, in the rise of t e sleeve under the action of the primary lifting lever, the engagement of such cam-edge therewith will cause the finger-lever under its inertia to progressively assume difl'erent positions in which its centerof gravity remains upon. the same side of thefulcrum, or to move by mo mentum into a position-wherein its center of gravity upon the opposite side of the fulcrum to. cause said stud to enter a recess or pocket upon. the opposite sideof said slot affording a detaining shoulder for positive engagement with the stud. The position. which the finger-lever assumes is determined by the speed of rising movement of the sleeve, a comparatively slow movement of the latter insuring the continued contact of the stud with the cam-edge of the slot so that the release of the sleeve by the primary lift-v ing lever permits the sleeve to drop without obstruction, while a more rapid rise of the sleeve under the action of the primary lifting lever causes the swinging of the fingerlever by momentum to the opposite side of its fulcrum for entrance of the stud into its detaining recess or pocket. In this position of the linger-lever, the sleeve, and hence the presser-bar, is locked in its upper or Workreleasing position. i 3 i The detaining pocket of the fingerdever is flared so as to produce an outwardly inclined outer edge, and the slight lift. of the sleeve beyondnormal raised position serves by engagement of its stud with said inclined edge to throw the lever into opposite extreme or releasing position with itstangential cam edge in contact with the lateral stud of the sleeve, whereby release of the primary lifting lever permits the sleeve to freely descend and the presser-bar to fall for engagement of the presser-foot With'the work.-

It is thus evident that the quickness with which the primary lifting lever is actuated determines whether the detaining fin gerlever shall-assume releasing or detaining position, and hence whether the Presser-foot shall promptly descend upon the work upon the release of the primary lifting lever" or whether it shall remain elevated for a subsequent actuation of the primary lifting lever for unlocking the presser-bar from raised position. I

The invention will loe understood by reference to the accompanying drawings, in which Figure 1 is a rear side elevation of a Singer No. 62 doubleechain-stitch machine provided with the present improvement, and Fig. 2 a front end view of the same with the face-plate removed. Fig. 3 is a view of the presser-bar lifting device similar to. Fig. 2 but with the finger-lever represented in dif-. ferent full and dotted linepositions. Fig. 4: is a'perspective view of the detaining fingerlever and its fulcrum-pin. y i i As represented in the drawings, the machine frame comprises the base -1 from which rises the hollow standard .2 sustainingthe tubular overhanging arm 3 terminating in Patented July 2, this.

ion

the head 4:, the base having vsecured thereon naled the reciprocating needle-bar 6 earrying the needles 7 and the forward and rearwardpressel barsfi and 9, normally pressed downwardly by means of thesprings '10 and 11 and having secured upon their lower ends the forward and rearward resser-feet 12 and 13 opposed to the work-plate 5 and the eedzd gle c The presse'r-bar' 9 has fixed thereon by means of the set-screw '15 the 'collar 16 formed with a forked lateral extension embracing the bar' 8, andhas applied thereto beneath said collar the loose sleeve '17 pro videdatthe lower end with a lateral extension 18 projecting beneath and'adapted to' fengage the under face of the collar 19 fixed uponthe'presser-bar 8 by means of the set-screw 20. The sleeve '17 is formed with a rearwardly projecting boss 21 provided with fthe pin 22 which enters an elongated aperture 23 at theforward end of thelprim'ary" presser-foot' lifting rock-lever 24 which is fulcrmned intermediate. its ends upon the stud-screw 25 tapped into the rear, ward side of the tubular arm 3. The lever 2hasin its rearward ai man aperture 26 e-nteredfbylthe hooked upper end of the rod 27 p'a'ssingfthrough the work-plate 5 and having fixed" thereon the; collar 28 formed with an apertured lateral lug 29 to which is lnieele'verlrod 30 by means of which the lever 24 isrocked in a manner well known to lift the sleeve'17 and with it the presser bars 8' and 9 and'the presser-feet carried thereby. A

Fixed within the lower portion of the bracket-arm head 4 is the fulcrumpin 31 upon "which is mounted the enlarged lower or hu b portion 32' of the finger-lever '33 which is provided above the fulcrum-pin inner" with the slot 34: having in the side adjacent the' body portion of the 'lever the substantially straig'hflcam-ed'ge 35 in tangential relation with an imaginary circle concent'ricl vvithtlie fulcrumqa'i'n 31, and "having in the outer "portion of its opposite edge the lateral flaring recess or. pocket 36 formed with the detent shoulder 37 and the upwardly andioutwardl inclined cam ,edge38.

' sliding sleeve .1 carries aibller-stud of the operating treadle or knee-lever, and the rise of the sleeve 17 carries the stud 3i) upward in continuous contact with the camedge 35, the body of thelever 33 swinging upwardly but remaining upon the same side of a vertical line passing through the fulcrum-pin 31, as represented in dotted lines in Fig. '3. In case the operator desires the presser-feet to remain in raised position after release of thelifting lever 21, a. quick movement of the latter causes the stud 39 to swing the lever 33 with sufiicient speed to cause its momentum to carry it into its opposite extreme position at the opposite side of the fulcrum-pin 31, whereby it is caused to assume the locking position represented in fulllines in Fig.3, with the stud 39 resting upon the detaining shoulder 37. The release 'of the lever 26 under such condition leaves the presser-feet locked in their raised positions. In order to lower the presser feet upon the work, a slight actua tion of the lever 24 to elevate the sleeve 17 above its normal locked position causes the engagement of the stud 39 with the cam edge 38 to swing the lever 33 by momentum into unlocking position whereby it is released fromthe pocket 36 and is caused under the action of the springs 10 and 11 to ride down the cam edge 35 while the lever 33 gradually assumes normal position, represented in Figs. 1 and 2.

While according to the present invention the lever 33 serves primarily as a detent ,for maintainingthe presser-feet elevated at the will. of the operator, the sloti34l has upon the side opposite the cam edge a diver-gently inclined cam edge 40 so disposed that the operator may effect the lifting of the Presser-feet by hand by shifting the lever 33 from the position represented in Fig. 2 to the full line position represented in Fig, 3,

In theinachine represented in the drawings, two pressenbars are shown each provided with a presser-foot, but it is evident that the present improvement is equally adapted for embodiment in machines employing only a single presser-foot. It is also evident that the present improvement is not-'liniitedto the particular construction and arrangement of parts herein shown and described, its .leading'feature being the provision for control of the period during which the presser-foot remains elevated by means disposed beneath the work-plate so that the hands of the operator may be entirely free to manipulate. the work.

Having thus set forth the nature of the invention, what I claim herein 1. Ina sewing machine, in combination, a

presser-foot, a lifter therefor, and means movable by'and adapted to continue its movement independently of said lifter for detaining the presser-foot raised when .desired.

2. In a sewing machine, in combination, a presser-foot, a detent-lever provided with release and detaining portions for control of the action of the resser-foot, connecting means between said lever and the presserfoot, a lifter for the presser-foot, and connections between said lifter and said detentlever for causing movement of the detentlever from the'lifter whereby the presserfoot may be detained raised or released from a raised position when desired.

3. In a sewing machine, in combination, a Presser-foot, a lifter therefor, and a detent for maintaining the presser-foot raised and controllable through said lifter by a single application of force to be either effective or ineffective in maintaining the presser-foot raised after it has been elevated.

4. In a sewing machine, in combination, a presser-foot, a lifter therefor provided with means for locking the presser-foot in raised position, and a second lifter adapted to operate the first-named lifter to render it either effective or ineffective for locking the presser-foot in raised position.

5. In a sewing machine, a presser-foot, a lever, a treadle connection to said lever, and means operable through said treadle connection and lever for raising and either locking in raised position or releasing said presserfoot by a single application of foot power in the same direction.

6. In a sewing machine, a presser-foot, two separate and distinct presser-foot lifting levers, one of which is shaped to detain the Presser-foot raised, said presser-foot lifting levers being operatively connected to the presser-foot in such wise that operation of one lever to elevate the foot may be utilized to effect a detaining of the Presser-foot raised by the other.

7. In a sewing machine, a presser-foot, lifting mechanism including a lifting lever operated from below the machine, and a de tent shaped to hold the presser-foot raised and controlled by said lever to effect a looking of the presser-foot in raised position whereby the presser-foot may be moved from work-engaging position and held elevated or lowered as desired by a single application of foot power.

8. In a sewing machine, a presser-foot, treadle and hand operable lifting levers operatively connected with said presser-foot for permitting it to be moved by either hand or foot power, said hand operable lifting lever being capable of manipulation by said treadle operable lifting lever to efiect a look ing of the presser-foot in raised position and through a momentary application of footpower.

9. In a sewing machine, a presser-foot, a lever, a treadle connection for moving said lever and thereby lifting said presser-foot, and means operatively arranged with relation to said lever and presser-foot for se curing said presser-foot in raised position whereby through rapid and slow applications of foot power the Presser-foot may be elevated with or without respectively a securing thereof in raised position.

10. In a sewing machine, a resser-bar, a presser-foot carried thereby, a lever connected to said bar, a treadle connection for mov ing said lever and lifting said bar and presser-foot, a detent operatively connected to said bar, said detent being shaped to permit the elevation of said presser-foot with or without a locking thereof in raised position and said detent being actuated through its connection with the resser-bar when the bar is lifted by an application of foot-power through the treadle connection.

In testimony whereof, I have signed my name to this specification.

ALBERT H. DE VOE.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Welshman, h. e.

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