US3777686A - Linear action knee lifters - Google Patents

Linear action knee lifters Download PDF

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Publication number
US3777686A
US3777686A US00267847A US3777686DA US3777686A US 3777686 A US3777686 A US 3777686A US 00267847 A US00267847 A US 00267847A US 3777686D A US3777686D A US 3777686DA US 3777686 A US3777686 A US 3777686A
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US
United States
Prior art keywords
carriage member
rockshaft
motion
knee shift
carriage
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
US00267847A
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English (en)
Inventor
J Hage
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.)
SSMC Inc
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
Application granted granted Critical
Publication of US3777686A publication Critical patent/US3777686A/en
Assigned to SSMC INC., A CORP. OF DE reassignment SSMC INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SINGER COMPANY, THE
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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

Definitions

  • ABSTRACT A knee shift for a sewing machine is disclosed which converts linear motion of a carriage having a kneepad adjustably attached thereto to rotary motion of a rockshaft; which can be used, through suitable linkage and leverage, to actuate an intermittently operating mechanism as for example a presser foot lifter.
  • Two modifications are shown including a ramp and cam follower arrangement wherein the ramp cam surface may be shaped to provide a uniform actuating force with, for example, any given presser lifting device.
  • knee shift devices to enable the operator to raise the cloth presser device without the use of her hands for a variety of-purposes including removing the fabric at the end of the sewing operation, repositioning of the fabric after partially completing a seam or for inserting an additional piece of material under the presser device.
  • the advantage of the knee shift is that an operator may raise the presser foot by use" of her knee while her hands are otherwise engaged in gripping the fabric or securing a new piece of material to place under the presser foot. It is, therefore, an aid to efficient operation and utilization of the sewing machine.
  • the usual presser device utilizes resilient members, generally coil springs to exert pressure on the fabric.
  • resilient members generally coil springs to exert pressure on the fabric.
  • the force required to be exerted is greater than that required for low speed machines in order to overcome the inertia of the presser system which would interfere with proper feeding and sewing.
  • the amount of force required to lift these presser systems is substantial initially and increases rapidly.
  • FIG. 1 is a front elevational view of a sewing machine containing one embodiment of the invention
  • FIG. 2 is a bottom plan view of the embodiment shown in FIG. 1;
  • FIG. 3 is a side view of the embodiment shown in FIG. 1 taken from line 3-3'in FIG. 1;
  • FIT. 4 is an exploded perspective of the embodiment of FIG. 1 indicating the relative positions of the various parts;
  • F IG. 5 is a front elevational view of a sewing machine containing a second embodiment of the invention, and;
  • FIG. 6 is a bottom plan view of the embodiment shown in FIG. 5.
  • an industrial sewing machine 1 is supported on leveling feet 2 by a submerged table 3 having an opening 4 through a sewing machine sump 5 protrudes.
  • the submerged table 3 is supported from a work table 7 by supporting rods 6, the work table 7 having cut out 8 through which the machine 1 extends.
  • a knee shift device 10 supported by a supporting block 12 which is affixed to the submerged table by screws 11.
  • the knee shift device 10 includes a track 15 having a back portion 16 from which protrude two spaced horizontal rails 17.
  • An extension 18 to the left end of the back portion 16 supports a roller 19, the periphery 20 of which projects slightly above the lower horizontal rail 17.
  • a stop 21 is affixed to one end of the upper horizontal rail 17 above the extension 18 to the back portion 16.
  • a pair of holes 22 in the track 15 accomodates a pair of screws 23 to affix the track member to the support block 12.
  • a carriage member 25 is constructed with a front portion 26 and horizontal rails 27 spaced to nest within the horizontal rails 17 of the track 15.
  • Aroller 28 is affixed to the carriage member 25 between the horizontal rails 27 at the right end of the carriage member.
  • the periphery 29 of the roller 28 extends slightly below the lower horizontal rail 27 of the carriage member 25.
  • a stop 30 is affixed adjacent the roller on the lower horizontal rail 27.
  • the carriage member 25 moves within the track 15 supported on one end by the roller 28 contacting the lower horizontal rail 17 of the track member 15.
  • the opposite end of the carriage member 25 is supported by the roller 19 carried by the track member 15. Movement of the carriage to the extreme left position is impeded by the stops 21 and 30, interfering with the rollers 28 and 20 respectively.
  • a ramp element 33 containing a cam surface 34 is attached by screws 35 to the carriage member 25.
  • a right angle retainer 38 held by screws 11 to the support block 12 retains the carriage member 25 within the horizontal rails 17 of the track 15.
  • a clamp 51 fastened to the carriage member 25 by screws 50 carries the horizontal arm 53 of a bracket 49 adjustably held in place by clamping screw 52.
  • a kneepad 55 is affixed to the vertical arm 54 of the bracket 49 by means of a clamping screw 56.
  • Supports 40 affixed to the submerged table 3 by screws 41, provide bearing and support for a rockshaft member 42 in a direction transverse to the carriage member 25.
  • a block 45 adjustably attached to the rockshaft member 42 by screws 46 carries a cam follower 47 at the end of a lever 48 projecting from the block.
  • the block 45 is positioned on the rockshaft member 42 so that the cam follower 47 abuts the cam surface 34 of the ramp element 33.
  • Position of the rockshaft member 42 within the supports 40 is maintained by collars 43 attached to the rockshaft member by screws 44 (FIG. 3).
  • a lever 60 On the opposite end of the rockshaft member 42 from block 45 is adjustably attached a lever 60.
  • a rod 61 is attached to the end of lever 60 and projects through hole 58 in the submerged table and in the work table (not shown) and extends to a lever depending from a second rockshaft 62 in the sewing machine. Rotation of rockshaft 62 results in elevation of the presser foot 63 of the sewing machine 1.
  • the cam surface 34 may be tailored by the characteristics of the presser system of the sewing machine 1 by creating curvatures as indicated in FIGS. 1 and 4.
  • the curvature is designed to give the greatest rotation of the rockshaft member 42 and consequent elevation of the presser foot 63, while the spring pressure of the presser system is relatively low.
  • the greatest change of cam surface 34 therefore occurs in area 36 during the initial motion of the kneepad 55.
  • the rate of change of the curvature in area 37 is considerably less than that in area 36.
  • the induced motion of the presser foot 63 will, correspondingly, be somewhat sl'ower.
  • the net result provided by the curve of cam surface 34 will be to create a uniform force required on kneepad 55 to elevate the presser foot 63.
  • FIGS. 5 and 6 is shown another embodiment of the device similar in all respects except without the use of ramp element 33 and cam follower 47.
  • a rod 66 is attached onto the vertical arm 54 of the bracket 49 through a universal connector 65 affixed to one end of the rod.
  • a second rod 68 also having a second universal connector 65 affixed to one end is joined to this first rod by means of clamp 67 which allows their combined length to be readily changed.
  • the second universal connector 65 is attached to a lever 69 whose end is held in a connection 70 affixed to the rockshaft member 42.
  • adjustments for the horizontal position of the kneepad 55 are accomodated by lengthening or shortening the rods 66 and 68 through loosening of clamp 67 and retightening of this clamp when the proper position of the horizontal arm 53 of the bracket 49 in the clamp 51 has been achieved.
  • Horizontal positioning of the kneepad 55 will have a minimal effect on the amount of force required to actuate the knee shift device 10.
  • kneepad 55 is achieved by relocating the horizontal arm 53 of the bracket 49 within the clamp 51 attached to carriage member 25.
  • Vertical positioning of kneepad 55 is achieved by relocating the kneepad vertically on the vertical arm 54 of the bracket 49.
  • a knee shift device for a sewing machine having an intermittently operating mechanism comprising; a track, a carriage member means on said carriage member which constrain it to move along a straight line parallel, said track, a knee shift pad, means securing said knee shift pad to said carriage member, a rockshaft member supported transversely of said carriage member and track and including means adapted for operative connection to said intermittently operated mechanism, and means converting the linear motion of said carriage member to rotary motion of said rockshaft member.
  • a device as claimed in claim 1 wherein the means converting the linear motion of said carriage member to rotary motion of said rockshaft member includes,
  • a knee shift device as claimed in claim 1 wherein the means securing said knee shift pad to said carriage member includes:
  • a knee shift device as claimed in claim 4 wherein the means converting linear motion of said carriage member to rotary motion of said rockshaft member includes;
  • a knee shift device as claimed in claim 5 wherein said linkage includes a pair of rods, one pivoted to said bracket and the other pivoted to said lever; and a clamp adjustably connecting said rods, whereby movement of said bracket along the path of motion of said carriage member may be accommodated by extending or contracting the clamped length of the rods.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US00267847A 1972-06-30 1972-06-30 Linear action knee lifters Expired - Lifetime US3777686A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US26784772A 1972-06-30 1972-06-30

Publications (1)

Publication Number Publication Date
US3777686A true US3777686A (en) 1973-12-11

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ID=23020378

Family Applications (1)

Application Number Title Priority Date Filing Date
US00267847A Expired - Lifetime US3777686A (en) 1972-06-30 1972-06-30 Linear action knee lifters

Country Status (3)

Country Link
US (1) US3777686A (enrdf_load_stackoverflow)
JP (1) JPS5328599Y2 (enrdf_load_stackoverflow)
GB (1) GB1405766A (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4567838A (en) * 1983-03-23 1986-02-04 Fritz Gegauf Aktiengesellschaft Bernina-Nahmaschinenfabrik Apparatus and process for dropping feed dog and lifting presser foot simultaneously
US4957053A (en) * 1988-08-12 1990-09-18 Liu Hsiao C Linking mechanism for sewing machine
US5220877A (en) * 1991-10-07 1993-06-22 Martin Redovian Presser foot lifter attachment for sewing machine
US20100000453A1 (en) * 2008-07-01 2010-01-07 Brother Kogyo Kabushiki Kaisha Knee lever for sewing machine
US20140373765A1 (en) * 2013-06-25 2014-12-25 Zeng Hsing Industrial Co., Ltd. Knee-controlled motor control device for a motor-driven presser mechanism of a sewing machine

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1668408A (en) * 1925-03-02 1928-05-01 Carl O Johnson Fan
US2067038A (en) * 1935-11-26 1937-01-05 Singer Mfg Co Presser-lifter actuating device for sewing machines
US2250992A (en) * 1937-07-09 1941-07-29 Eleanor C Kaier Presser-foot lifter for sewing machines
US2664841A (en) * 1952-02-27 1954-01-05 Singer Mfg Co Presser lifter actuating mechanism for sewing machines
US3340836A (en) * 1965-10-15 1967-09-12 Singer Co Knee shift mechanisms for sewing machines

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1668408A (en) * 1925-03-02 1928-05-01 Carl O Johnson Fan
US2067038A (en) * 1935-11-26 1937-01-05 Singer Mfg Co Presser-lifter actuating device for sewing machines
US2250992A (en) * 1937-07-09 1941-07-29 Eleanor C Kaier Presser-foot lifter for sewing machines
US2664841A (en) * 1952-02-27 1954-01-05 Singer Mfg Co Presser lifter actuating mechanism for sewing machines
US3340836A (en) * 1965-10-15 1967-09-12 Singer Co Knee shift mechanisms for sewing machines

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4567838A (en) * 1983-03-23 1986-02-04 Fritz Gegauf Aktiengesellschaft Bernina-Nahmaschinenfabrik Apparatus and process for dropping feed dog and lifting presser foot simultaneously
US4957053A (en) * 1988-08-12 1990-09-18 Liu Hsiao C Linking mechanism for sewing machine
US5220877A (en) * 1991-10-07 1993-06-22 Martin Redovian Presser foot lifter attachment for sewing machine
US20100000453A1 (en) * 2008-07-01 2010-01-07 Brother Kogyo Kabushiki Kaisha Knee lever for sewing machine
US8161897B2 (en) * 2008-07-01 2012-04-24 Brother Kogyo Kabushiki Kaisha Knee lever for sewing machine
US20140373765A1 (en) * 2013-06-25 2014-12-25 Zeng Hsing Industrial Co., Ltd. Knee-controlled motor control device for a motor-driven presser mechanism of a sewing machine

Also Published As

Publication number Publication date
JPS4951456U (enrdf_load_stackoverflow) 1974-05-07
JPS5328599Y2 (enrdf_load_stackoverflow) 1978-07-18
GB1405766A (en) 1975-09-10

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Legal Events

Date Code Title Description
AS Assignment

Owner name: SSMC INC., A CORP. OF DE, CONNECTICUT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SINGER COMPANY, THE;REEL/FRAME:005041/0077

Effective date: 19881202