US1947827A - Knee-control mechanism for electric sewing machines - Google Patents

Knee-control mechanism for electric sewing machines Download PDF

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Publication number
US1947827A
US1947827A US619203A US61920332A US1947827A US 1947827 A US1947827 A US 1947827A US 619203 A US619203 A US 619203A US 61920332 A US61920332 A US 61920332A US 1947827 A US1947827 A US 1947827A
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US
United States
Prior art keywords
knee
slide
bar
sewing machine
controller
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US619203A
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English (en)
Inventor
Daniel H Chason
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Singer Co
Original Assignee
Singer Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Singer Co filed Critical Singer Co
Priority to US619203A priority Critical patent/US1947827A/en
Priority to FR757428D priority patent/FR757428A/fr
Application granted granted Critical
Publication of US1947827A publication Critical patent/US1947827A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/14—Devices for changing speed or for reversing direction of rotation
    • D05B69/18—Devices for changing speed or for reversing direction of rotation electric, e.g. foot pedals
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T74/00—Machine element or mechanism
    • Y10T74/20—Control lever and linkage systems
    • Y10T74/20528—Foot operated
    • Y10T74/2054—Signal

Definitions

  • This invention relates to electric sewing machines of the table or cabinet type adapted to rest upon the floor and has for an object to provide such a machine with an improved knee-control mechanism for regulating the speed of the sewing machine while in use.
  • a further object of the invention is to provide a knee-control mechanism for an electric sewing machine, the knee-engaged element of which is shiftable to an inconspicuous or concealed inoperative position and which, when in working position, follows the movements of the operator's knee with a parallel motion, without rubbing upon or sliding relative to the knee.
  • the invention comprises the devices, combinations and arrangements of parts hereinafter set forth and illustrated in the accompanying drawings of a preferred embodiment of the invention, from which the several features of the invention and the advantages attained thereby will be readily understood by those skilled in the art.
  • Fig. 1 is a frag-'- mentary front side elevation of a sewing machine table embodying the invention.
  • Fig. 2 is a horizontal section through one corner of the table, showing the knee-control mechanism in top plan.
  • Fig. 3 is a section on the line 33, Fig. 2, with the woodwork omitted.
  • Fig. 4 is a section substantially on the line 44, Fig. 2.
  • Fig. 5 is a section on the line 5-5, Fig. 4.
  • Fig; 6 is a section on the line 6-6, Fig. 4.
  • vFig. '7 is a disassembled perspective view of one end of the controller-lever and its reinforcing means.
  • Fig. 8 is a section through the reinforced end of the controller-lever and
  • Fig. 9 is a disassembled perspective view of the operating slide-bar and guide elements of the mechanism.
  • FIG. 1 represents an electric sewing machine head including the motor 2 and hand-wheel 3 which is installed as usual in a drop-head sewing machine table or cabinet having a table-top 4, corner legs one of which is shown at 5, a front Wall 6, and end walls one of which is shown at '7.
  • the designation sewing machine table as used herein, has a. broad significance and is intended to include a sewing machine support of any known cabinet, stand or table type adapted when in use to rest upon the floor.
  • Screwed to the end wall '7 of the table is one leg 8 of an angular supporting plate the other leg 9 of which is screwed to the front wall 6 of the table.
  • a motor-controller-unit or rheostat 10.01 the well known carbon-compression type disclosed, for example, in the patent to Chason. No. 1,792,818, of Feb. 1'7, 1931.
  • Such a controllerunit includes an operating pull-rod or draw-bar 11 carrying the bow-spring bridging contactmember 11 which, when pulled downwardly, contacts with and gradually decreases the electrical resistance of the stacks of carbon disks 11 between the terminal screws 12 connected in series with the sewing machine motor, thus increasing the speed of the motor.
  • the recovery spring 13 raises the draw-bar 11 to its oil position when the down-pull on such draw-bar is relieved.
  • the lower screw-threaded end of the draw-bar 11 carries the adjustable flanged nut 14 which is engaged by the apertured rearward end of a lever 15 fulcrumed on thescrew l6 threaded into the supporting-plate-leg 8.
  • a lug 17 on the lever 15 enters a notch 17' in the flange of the nut 14 to prevent accidental turning of the nut 14 when the device is operated.
  • the lever 15 is formed at its forward end with a downturned tip terminating in an inclined lower edge 18 which is reinforced and covered by a U-shaped wear-strip 19 of hardened steel having a rounded bottom edge 19' and held in place by means of the rivet 20.
  • the trough-shaped guide 22 which slidably receives a slide-bar comprising two sections 23, 24 held clamped together by a-thumb-screw 25 which passes freely through a clearance slot 26 in the bottom wall of the guide 22.
  • the thumbscrew 25 has a clamping shoulder 27 at the base of the reduced and threaded shank 28.
  • the shank 28 passes through a slot 29 in the slidebar section 24 and is screwed into the tapped hole 30 in the slide-bar section 23 which latter is in the form of an inverted trough receiving and embracing the section 24.
  • the slide-bar section 23 is formed at its free end with ahinge-loop 31 for the hinge-pin 32 connecting the hinge-loops 33 at the upper end of the knee-extension arm 34 which depends from the slide-bar 23, 24 to a position within reach of the operators knee indicated at 7c.
  • the arm 34 is inclined away from a position normal to the slide-bar 23, 24 in the direction in which the slide-bar is moved by the operator. Pressure of the operators knee exerted laterally in the direction of the arrow, Fig. 1, therefore causes a slight lifting or upward camming of the arm 34 which tends to balance any cramping or binding tendency of the slidebar 23, 24 in the guide 22 due to the application of the lateral knee-pressure to the arm 34 at a point below the level of the slide-bar.
  • the slide-bar section 24 is formed at its end remote from the arm 34 with upstanding ears 36 which support the bearing pin 37 for the three anti-friction rollers 38, 39 and 40.
  • the intermediate roller 38 is somewhat smaller in diameter than the outer rollers 39, 40 and operatively engages the inclined lower edge 19 of the wear-strip 19, as shown in Figs. 3 and 4.
  • the outer rollers 39 and 40 track upon the bottom wall of the guide 22 and an end-piece 41 having a flange 42 overhanging the roller 39, as shown in Fig. 3, is secured to the guide 22 to resist upward movement of the roller 39 under any twisting tendency of the slide-bar 23, 24 in the guide 22.
  • the slide-bar 23, 24 is biased in opposition to the force of the operators knee by means of the spring 43 which is anchored at one end to the pin '44 on the slide-bar section 24 and at its opposite end to the clip 44' embracing the left-hand end of the guide 22.
  • a cover-plate 45 protects the spring 43 and has a depending side wall 46 which is screwed to one side wall of the guide 22, as shown in Fig. 5.
  • a stop-pin 47 Projecting upwardly from the bottom wall of the guide 22 is a stop-pin 47 which enters the slot 48 in the slide-bar section 24 and limits the endwise movement of the slide-bar in opposite directions.
  • a suitable cover 49 encloses and pro- "tects the controller-unit 10. This cover is secured to the angle-plate-leg 8 by the screw 50.
  • Any suitable means may be provided to produce enough friction in the hinge-joint between the bar 24 and arm 34 to retain the arm 34 in any position to which it may be shifted relative to the bar 24.
  • a leaf-spring 35 Fig. 4, which is curved at one end to frictionally engage or press upon the hinge-loop 31.
  • a knee-controller for electric sewing machines comprising a supporting plate adapted for attachment to a sewing machine table, a troughshaped member carried by said supporting plate and constituting a guideway, a slide-bar mounted in said guideway, a knee-extension hinged to said slide-bar, and an electric motor-controller unit connected to be operated by said slide-bar.
  • An electric sewing machine motor-controller comprising a guideway, a slide-bar received in said guideway and having, at one end three coaxial rollers the outer two of which track upon said guideway, a knee-shift depending from said slide-bar, a variable resistance unit, and a movable member for operating said unit having an inclined edge engaging the intermediate one of said rollers.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US619203A 1932-06-25 1932-06-25 Knee-control mechanism for electric sewing machines Expired - Lifetime US1947827A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US619203A US1947827A (en) 1932-06-25 1932-06-25 Knee-control mechanism for electric sewing machines
FR757428D FR757428A (fr) 1932-06-25 1933-06-23 Mécanisme de commande destiné à être manceuvré à l'aide du genou, pour machines à coudre électriques

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US619203A US1947827A (en) 1932-06-25 1932-06-25 Knee-control mechanism for electric sewing machines

Publications (1)

Publication Number Publication Date
US1947827A true US1947827A (en) 1934-02-20

Family

ID=24480883

Family Applications (1)

Application Number Title Priority Date Filing Date
US619203A Expired - Lifetime US1947827A (en) 1932-06-25 1932-06-25 Knee-control mechanism for electric sewing machines

Country Status (2)

Country Link
US (1) US1947827A (fr)
FR (1) FR757428A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2952164A (en) * 1959-07-13 1960-09-13 Singer Mfg Co Operating mechanism for sewing machine controllers
US5544600A (en) * 1994-04-25 1996-08-13 Dbh Limited, Inc. Knee control mechanism for industrial sewing machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2952164A (en) * 1959-07-13 1960-09-13 Singer Mfg Co Operating mechanism for sewing machine controllers
US5544600A (en) * 1994-04-25 1996-08-13 Dbh Limited, Inc. Knee control mechanism for industrial sewing machine

Also Published As

Publication number Publication date
FR757428A (fr) 1933-12-26

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