US3545393A - Sewing machine with removable stitching plate - Google Patents

Sewing machine with removable stitching plate Download PDF

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Publication number
US3545393A
US3545393A US784390A US3545393DA US3545393A US 3545393 A US3545393 A US 3545393A US 784390 A US784390 A US 784390A US 3545393D A US3545393D A US 3545393DA US 3545393 A US3545393 A US 3545393A
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US
United States
Prior art keywords
plate
lugs
stitching
sewing
sewing machine
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
US784390A
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English (en)
Inventor
Gunter Meier
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.)
GM Pfaff AG
Original Assignee
GM Pfaff AG
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 GM Pfaff AG filed Critical GM Pfaff AG
Application granted granted Critical
Publication of US3545393A publication Critical patent/US3545393A/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
    • D05B73/00—Casings
    • D05B73/04—Lower casings
    • D05B73/12—Slides; Needle plates

Definitions

  • the present invention relates to sewing machines, more particularly to a removable stitching plate mounted within an.
  • the screws may no longer properly fit in the depressions of the stitching plate, whereby to result in damage to the work or sewing material being operated on, as well as in other defects and drawbacks.
  • screwing and unscrewing of the plates is both time-consuming and troublesome to the ordinary sewing machine user or operator.
  • an iinportant'object of the present invention is the provision of an improved removable stitching plate for sewing machines of the referred to type which may be firmly locked in the operative position without requiring any special securing means; which requires no special tools for its removal and mounting; which can be removed and reinserted instantly and readily by mounting means accessible from the upper side
  • the invention involves generally the provision of a stitching plate for a sewing machine of the referred to type slidably supported, between an inoperative and an operative position and flush with the cloth plate or sewing table of the machine, by apair of shoulders upon the opposite edges of a rectangular opening of said cloth plate or table.
  • the same is provided with mounting lugs projecting from the opposite edges thereof adjoining said shoulders, said lugs being adapted to loosely fit, in the inoperative position of the plate, suitable recesses in the edges of said opening, to enable easy insertion and withdrawal, and said lugs adapted, in theoperative position of said plate, to resiliently engage or look with corresponding ledges or abutments of said table disposedwithin said edges and adjoining said recesses.
  • the mounting lugs in the operative position of the stitching plate are displaced from the'adjoining i'ecessesby a distance equal to the width of the lugs, whereby. to result in a minimum distance or movement between the operative and inoperative positions of the plate.
  • the stitching plate is furthermore provided in a known manner with a suitable aperture, to enable the passage of the needlein its operative position, and where a four-motion feed dog is provided, a further oblong aperture being having a length in excess of the feed stroke or total advance movement of said dog, is provided, to enable ready passage of the dog during'operation.
  • the difference between the length of the oblong aperture and the length of the feed dog is ad vantageously in excess of the width of the mounting lugs, to
  • the lugs project from the edges of the stitching plate at an angle in the downward direction and the cloth plate is formed with corresponding inclined abutment surfaces or ledges, to result in a firm resilient yet easily releasable locking engagement in the operativeposition of the plate, in a manner as will become v further apparent as the description proceeds in reference to the drawing
  • the stitching plate is removably mounted in a separate intermediate or damping plate of elastic material which is, in turn, secured in an opening of the sewing table or cloth plate of the machine, and the stitching plate may be further locked or arrested in its operative position by means of an auxiliary locking plate or slide mounted in said table.
  • the mounting of the stitching plate in a separate intermediate supporting plate, being secured to an opening in the sewing table with a sufficient play or, clearance, has the added advantage of enabling a ready alignment of the plate with the of the sewing table; and which is both simple in construction and suitable for ready structural incorporation in conventional sewing machines.
  • the nuthem! 1 denotes the cloth plate or sewing table of a conventional sewing machine from which extends the overhanging arm 2 terminating in a head within which is mounted the reciprocating needle, bar 9 carrying a needle 10.
  • Item 4 denotes an intermediate supporting plate of elastic material,
  • the stitching plate 7 has a first aperture 8, to enable passage of the needle 10 during operation for cooperation with the lower stitch-forming tools (not shown), to produce lockstitches in the work being operated on in a manner well known.
  • a lower feed dog 12 is provided, operated according to the well known four-motion principle and mounted below the plate 7, the latter has a further opening, or pair of openings, 11, to enable passage of the dog during operation.
  • the stitching plate 7 has a pair of outwardly projecting mounting lugs 13 disposed on the opposite sides thereof adjoining said shoulders, said lugs adapted to resiliently engage, in the operative position of the plate shown in the drawing, corresponding ledges or abutments 14 in the opening 6 of the intermediate plate 4, whereby to firmly resiliently lock the stitching plate in the operative position with the cloth plate, or intennediate plate 7 in the example shown, by virtue of the inherent elasticity of the materials.
  • the stitching plate 7 is formed with cuts 15 extending laterally of the lugs 13 and, in order to enable a ready removal 'from and reinsertion in the intermediate plate 4, the opening 6 in the-plate 4 is formed with lateral recesses 16 in the opposite edges thereof adjoining the lugs 13, said lugs being displaced, in the operative position of the plate, from the recesses 16 by a predetermined distance being less than the difference between the length of the aperture 11 and the length of the feed dog 12, for the purpose as pointed out hereinbefore.
  • the difference between the length of the aperture 11 and the length of the dog 12 slightly exceeds the maximum operating stroke of the dog in accordance with conventional practice.
  • a cover plate 17 sliding upon the ledges of the opening serves to lock plate 7 in the operative position.
  • the stroke or displacement of the plate 7 from its inoperative position to its operative position, and vice versa, or maximum displacement of the lugs 13 from the recesses 16 in the operative position of the plate is equal to the width of the lugs, whereby to ensure a maximum locking effect with a minimum operat ing stroke or displacement.
  • the width of the recesses 16 is slightly in excess of the width of the lugs 13, whereby to provide a loose fit of the lugs within the recesses in the inoperative position of the plate 7.
  • the plate 7 may be removed and reinserted without any special tools by simply displacing the same from its operative position shown to the inoperative position with the lugs 13 loosely fitting the recesses 16. Reinsertion is then effected in reverse sequence, as will be further described in the following.
  • the lugs 13 may be offset, to extend in a direction parallel to the plane of the plate 7 and to interlock with corresponding ledges upon the edges of the opening 6 in the plate 4. Besides, instead of arranging the lugs 13 on the opposite edges of the plate 7, they may be disposed on the opposite sides of the apertures 11 for cooperation with suitable complementary locking elements or abutments extending from the intermediate plate 4 or table 1, respectively.
  • the sewing machine In use, in order to effect the removal of the stitching plate 7 from its operative position shown, the sewing machine is arrested ,with the needle in the up-position corresponding to the feed dog being in the starting position of its quadrilateral feed movement, that is, a position adjoining the lower edge of the apertures 11. This position is most favorable for the safe removal and reinsertion of the stitching plate.
  • the locking slide 17 In order to remove the plate, the locking slide 17 is at first sufficiently withdrawn in the rearward direction, whereupon plate 7 is displaced in the same direction until the lugs 13 are positioned in the recesses 16, this operation being facilitated by the roughened gripping surfaces 18 upon the upper surface of the stitching plate. The latter may then be removed by withdrawalin the upward direction, to provide ready access to the lower stitch-forming tools for cleaning and the carrying out of adjustments or repairs.
  • Reinsertion of the stitching plate 7 is effected in reverse sequence by at first applying the same to the opening 6 with the lugs 13 loosely fitting the recesses 16 and subsequently displacing it in .the forward direction until the lugs engage the abutments 14, to firmly lock the plate with the table 1 or intermediate plate 4, respectively.
  • a sewing machine comprising in combination:
  • a sewing table consisting at least in part of resilient material having a U-shaped opening formed therein and a slide mounted flush with said table and having an edge forming a rectangular opening with said U-shaped opening, the opposite edges of said U-shaped opening being provided with recesses;
  • said stitching plate having a first aperture, to enable passage of said needle, and a second aperture, to enable passage of said feed dog, during a stitching cycle in the operative position of said plate;
  • said lugs loosely fitting said recesses, in the retracted position of said plate and resiliently locking, by virtue of the resiliency of the material, with said abutments in the operative position of said plate.
  • said recesses having a width slightly in excess of the width of said lugs, and said lugs being displaced, in the operative position of said plate, from the adjoining recesses by a distance substantially equaling the width of said lugs.
  • said second aperture being parallel to said shoulders and having a length in excess of the length of said dog, and the stroke of displacement of said stitching plate between its operative and its retracted positions being less than the difference between the length of said second aperture andthe length of said dog.
  • said second aperture being parallel to said shoulders and having a length in excess of the length of said dog, said recesses having a width slightly in excess of the width of said lugs, said lugs being displaced in the operative position of said stitching plate, from the adjoining recesses by a distance substantially equal to the width thereof, and the width of said lugs being less than the difference between the length of said second aperture and the length of said dog.
  • a sewing machine comprising in combination:
  • a sewing table consisting at least in part of resilient material and having a U-shapekl opening and a slide mounted flush with said table and having an edge forming a rectangular opening of variable width with said U- shaped opening, the opposite edges of said U-shaped opening provided with recesses;
  • a stitching plate slidably supported by said shoulders flush with said table, to enable operation thereof between an operative and a retracted position, said plate having an aperture to enable passage of said needle in the operative position,

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US784390A 1967-12-18 1968-12-17 Sewing machine with removable stitching plate Expired - Lifetime US3545393A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP30589U DE1980501U (de) 1967-12-18 1967-12-18 Naehmaschine mit einer abnehmbaren stichplatte.

Publications (1)

Publication Number Publication Date
US3545393A true US3545393A (en) 1970-12-08

Family

ID=33368032

Family Applications (1)

Application Number Title Priority Date Filing Date
US784390A Expired - Lifetime US3545393A (en) 1967-12-18 1968-12-17 Sewing machine with removable stitching plate

Country Status (3)

Country Link
US (1) US3545393A (de)
CH (1) CH485902A (de)
DE (1) DE1980501U (de)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3799091A (en) * 1971-10-12 1974-03-26 Pfaff Ind Masch Slide for protection of an opening in the base plate of a sewing machine
FR2225985A5 (de) * 1973-04-13 1974-11-08 Manufrance
US4221181A (en) * 1979-06-04 1980-09-09 The Singer Company Throat plate for above the bed feed system
US4395962A (en) * 1981-09-23 1983-08-02 The Singer Company Straight stitch throat plate for a sewing machine
US4694763A (en) * 1980-08-20 1987-09-22 Ssmc Inc. Sewing machine bed slide retention
US5775245A (en) * 1996-05-10 1998-07-07 The Singer Company N.V. Bed slide device of a sewing machine
US20140373766A1 (en) * 2013-06-24 2014-12-25 Janome Sewing Machine Co., Ltd. Needle plate of sewing machine

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3799091A (en) * 1971-10-12 1974-03-26 Pfaff Ind Masch Slide for protection of an opening in the base plate of a sewing machine
FR2225985A5 (de) * 1973-04-13 1974-11-08 Manufrance
US4221181A (en) * 1979-06-04 1980-09-09 The Singer Company Throat plate for above the bed feed system
US4694763A (en) * 1980-08-20 1987-09-22 Ssmc Inc. Sewing machine bed slide retention
US4395962A (en) * 1981-09-23 1983-08-02 The Singer Company Straight stitch throat plate for a sewing machine
US5775245A (en) * 1996-05-10 1998-07-07 The Singer Company N.V. Bed slide device of a sewing machine
US20140373766A1 (en) * 2013-06-24 2014-12-25 Janome Sewing Machine Co., Ltd. Needle plate of sewing machine
US9139942B2 (en) * 2013-06-24 2015-09-22 Janome Sewing Machine Co., Ltd. Needle plate of sewing machine

Also Published As

Publication number Publication date
CH485902A (de) 1970-02-15
DE1980501U (de) 1968-03-07

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