US3913507A - Workpiece guide for sewing machine - Google Patents

Workpiece guide for sewing machine Download PDF

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Publication number
US3913507A
US3913507A US471645A US47164574A US3913507A US 3913507 A US3913507 A US 3913507A US 471645 A US471645 A US 471645A US 47164574 A US47164574 A US 47164574A US 3913507 A US3913507 A US 3913507A
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US
United States
Prior art keywords
guide
workpiece
path
cover plate
station
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
US471645A
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English (en)
Inventor
Konrad Pollmeier
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.)
Duerkoppwerke GmbH
Original Assignee
Duerkoppwerke GmbH
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 Duerkoppwerke GmbH filed Critical Duerkoppwerke GmbH
Application granted granted Critical
Publication of US3913507A publication Critical patent/US3913507A/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
    • D05B35/00—Work-feeding or -handling elements not otherwise provided for
    • D05B35/10—Edge guides
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05D—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES D05B AND D05C, RELATING TO SEWING, EMBROIDERING AND TUFTING
    • D05D2207/00—Use of special elements
    • D05D2207/02—Pneumatic or hydraulic devices

Definitions

  • a sewing machine has a sewing surface along which the workpiece is passed through a sewing station.
  • a fixed guide element has a guide edge extending parallel to the workpiece path next to the station.
  • a cover element is spaced above the surface and is displaceable between an operative position overlying the path and overhanging the guide edge to define with this guide edge and with the sewing machine working surface a guide slot, and an inoperative position lying outside the path in back of the guide edge.
  • a pneumatic cylinder is provided to displace this cover element between these two positions and is coupled to the sewing machine drive so that the cover element is in its operative position when the machine is operating at high speed but is displaced into an inoperative position when the machine is operated at low speed for precise stitching.
  • the present invention relates to a workpiece guide fora sewing machine.
  • Such a holddown is generally formed as a plate extending outwardly from the guide edge. It serves in addition to prevent the goods being stitched from riding up over the guide edge or from bunching at the sewing station.
  • Yet another object is the provision of an improved workpiece guide for a sewing machine.
  • yet another object is to provide such a workpiece guide which overcomes the above-given disadvantages.
  • a workpiece guide comprising a fixed guide element having a guide edge extending along the workpiece path adjacent the sewing station, and a cover plate which is spaced above the surface and is displaceable between an operative position overlying the path and overhanging the guide edge to define therewith and with the surface a guide slot for the workpiece, and in operative position lying outside the path and in back of the guide edge, that is on the other side of the guide edge from the sewing station.
  • Means is provided to displace the cover plate between the operative and inoperative position.
  • Such an arrangement allows the holddown plate or cover element to be spaced relatively closely to the sewing surface whenever precise guiding of the workpiece is necessary, while when a thickened portion of the workpiece, such as the hem or foot of a stocking,
  • this cover element is displaced out of the workpiece path, thereby allowing maneuvering of the workpiece by hand.
  • the sewing machine has a two-speed drive, allowing it to be operated at a relatively fast running speed and a relatively slow precision-sewing speed.
  • the actuating means for the cover element is connected to this twospeed drive so as to hold the cover element in the operative position when the machine is operating at high speed and inoperative position when operating at low speed, thereby automatically displacing the cover element out of the workpiece path when precise stitching must be made.
  • a sensor which detects the thickened area of the workpiece and automatically displaces the cover element frrom the operative to the inoperative position.
  • the guide element having the guide edge is a metal plate secured to the sewing machine working surface
  • the cover element is a pivoted metal plate lying on top of the guide element and defining therewith a guide slot having a thickness approximately equal to that of the guide element.
  • This cover element is pivoted on the guide element and is operated in accordance with this invention by'its own small pneumatic cylinder.
  • means is provided for displacing the cover element and guide element transversely to the workpiece path and toward and away from the sewing station. This allows the seam spacing from the edge of the workpiece to be adjusted.
  • FIG. 1 is a top view partly in diagrammatic form of the arrangement according to the present invention.
  • FIG. 2 is a side view taken in the direction of arrow ll of FIG. 1.
  • a sewing machine has sewing table or surface 1 to which is secured as also shown in FIG. 2 a bottom guide plate 10 having a guide edge 11 turned toward a sewing station S. Goods to be stitched are fed to the station S in a path generally indicated by arrow P and parallel to a section 1 ll of the guide edge 1 l.
  • the sewing station S is provided with a vertically reciprocal needle 7 adapted to be received in a hole 5 in the surface 1.
  • Conventional feed pads 4 are provided for advancing the workpiece in the direction of arrow P and a presser foot 8 is adapted to hold the workpiece down on these feeders 4.
  • a two-speed sewing machine drive 9 serves to operate the needle 7 and feeders 4.
  • a cover plate 20 Pivoted on a bolt 25 welded to the plate 10 is a cover plate 20 having a foot 23 which can overhang the edge 11 over top of the path P and define a guide slot 12 adapted to snugly receive the workpiece.
  • Another plate 30 overlies the plate 20 and is secured via bolts 3 passing through slots 2 perpendicular to the path P. These bolts 3 also secure the plate 10 to the surface 1, this plate 10 being similarly formed with slots 2 so as to allow the entire arrangement to be displaced in the direction of double-headed arrow a shown in FIG. 1.
  • the plate 20 is provided with an actuating arm 22 formed at its end with a slot 24 in which a pin 63 carried on a fork 62 in turn on the piston rod 61 of a pneumatic cylinder 6 serves to displace the foot 23 between the solid-line position and the dot-dash position shown in FIG. 1.
  • This cylinder 6 is carried on a flange 17 bent up from the plate 30.
  • a compressor 13 is connectable via a valve 14 to the cylinder 6, which is itself urged by an internal spring into the solid-line position of FIG. 1. Opening of the valve 14, as for example by a foot switch 15, causes the cylinder to push the arm 22 and swing the cover plate 20 behind the guide edge 11. This allows a thicker part of the workpiece to pass through the stitching station S.
  • this foot pedal 15 is also connected to the two-speed drive 9 so that on normal runs which can be sewn at high speed the cover plate is in the operative, solid-line position but when a difficult region must be stitched the pedal 15 is depressed to swing the cover plate 20 out of the way and simultaneously slow down the sewing speed.
  • Sensor 16 is also provided upstream of the sewing station S so as to detect the thick part of the workpiece and operate the valve 14, thereby automatically swinging the cover plate 20 out of the way.
  • a sensor 16 in use in a machine for stitching stocking or hosiery can comprise a photocell which detects the thick dark regions of the foot and waistband of hose.
  • a sensor 16 may slow down the drive 9 as described above.
  • the guide edge 1 1 comprises the straight section 1 l 1 next to the sewing station S and a curved section 211 upstream or in front of the station S and curved away from an imaginary line L running parallel to the path P and lying on the section 111.
  • cover plate spaced above said surface, overlying said guide element and overhanging said edge in an operative position of overlying said path to define therewith and with said edge a guide slot for said workpiece
  • cover plate spaced above said surface and overlying said guide element, said cover plate being displaceable between an operative position overlying said path and overhanging said guide edge to define therewith and with said surface a guide slot for said workpiece, and an inoperative position lying outside said path to the side of said edge opposite said station;
  • said guide further comprising means connected to said means for displacing and operating same to position said cover plate in said operative position on operation of said machine at said fast rate and for automatically positioning said cover plate in said inoperative position of said machine at said slow rate.
  • a workpiece guide for a sewing machine wherein the workpiece is passed on a sewing surface along a path through a stitching station, said guide comprising: a guide element fixed to said surface and having a guide edge extending along said path adjacent said station;
  • cover plate spaced above said surface and overlying said guide element, said cover plate being displaceable between an operative position overlying said path and overhanging said guide edge to define therewith and with said surface a guide slot for said workpiece, and an inoperative position lying outside said path to the side of said edge opposite said station;
  • sensing means upstream in said path from said station for detecting an increase in thickness of said workpiece and connected to said means for displacing and operating same to automatically position said cover in said inoperative position on detection of such an increase in thickness.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US471645A 1973-05-23 1974-05-20 Workpiece guide for sewing machine Expired - Lifetime US3913507A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE7319362 1973-05-23

Publications (1)

Publication Number Publication Date
US3913507A true US3913507A (en) 1975-10-21

Family

ID=6638758

Family Applications (1)

Application Number Title Priority Date Filing Date
US471645A Expired - Lifetime US3913507A (en) 1973-05-23 1974-05-20 Workpiece guide for sewing machine

Country Status (4)

Country Link
US (1) US3913507A (fr)
FR (1) FR2230775B3 (fr)
GB (1) GB1441722A (fr)
IT (1) IT1012637B (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019448A (en) * 1975-03-12 1977-04-26 Rockwell-Rimoldi S.P.A. Workpiece guide for sewing machines
US4075957A (en) * 1975-07-21 1978-02-28 Rockwell-Rimoldi S.P.A. Workpiece guide for sewing machines
US4114546A (en) * 1977-04-30 1978-09-19 Pfaff Industriemaschinen Gmbh Sewing machine with a workpiece guide mechanism
US4133279A (en) * 1976-03-16 1979-01-09 Siegfried Wajcmann Sewing apparatus
US4164192A (en) * 1978-11-30 1979-08-14 The Singer Company Sewing machine motor speed limiting by pattern selection
US4211177A (en) * 1979-04-30 1980-07-08 The Singer Company Automatic slow speed for skip stitch mode
US4664045A (en) * 1985-05-30 1987-05-12 Kochs Adler Ag Sewing machine for producing an edge-parallel seam

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761401A (en) * 1953-11-13 1956-09-04 Singer Mfg Co Elastic tape guides and tensioning means for sewing machines
US3752100A (en) * 1971-10-20 1973-08-14 Union Special Machine Co Hem folding attachment

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2761401A (en) * 1953-11-13 1956-09-04 Singer Mfg Co Elastic tape guides and tensioning means for sewing machines
US3752100A (en) * 1971-10-20 1973-08-14 Union Special Machine Co Hem folding attachment

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4019448A (en) * 1975-03-12 1977-04-26 Rockwell-Rimoldi S.P.A. Workpiece guide for sewing machines
US4075957A (en) * 1975-07-21 1978-02-28 Rockwell-Rimoldi S.P.A. Workpiece guide for sewing machines
US4133279A (en) * 1976-03-16 1979-01-09 Siegfried Wajcmann Sewing apparatus
US4114546A (en) * 1977-04-30 1978-09-19 Pfaff Industriemaschinen Gmbh Sewing machine with a workpiece guide mechanism
US4164192A (en) * 1978-11-30 1979-08-14 The Singer Company Sewing machine motor speed limiting by pattern selection
US4211177A (en) * 1979-04-30 1980-07-08 The Singer Company Automatic slow speed for skip stitch mode
US4664045A (en) * 1985-05-30 1987-05-12 Kochs Adler Ag Sewing machine for producing an edge-parallel seam

Also Published As

Publication number Publication date
FR2230775B3 (fr) 1977-03-18
GB1441722A (en) 1976-07-07
FR2230775A1 (fr) 1974-12-20
IT1012637B (it) 1977-03-10

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JPH0131397B2 (fr)
ES226907A1 (es) UN DISPOSITIVO TOMADOR DE BUCLES PARA UNA MáQUINA DE COSER EN ZIG-ZAG