US3054365A - Lockstitch shoe sole sewing machines - Google Patents

Lockstitch shoe sole sewing machines Download PDF

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Publication number
US3054365A
US3054365A US750392A US75039258A US3054365A US 3054365 A US3054365 A US 3054365A US 750392 A US750392 A US 750392A US 75039258 A US75039258 A US 75039258A US 3054365 A US3054365 A US 3054365A
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US
United States
Prior art keywords
thread
machine
shoe sole
sewing machines
shoe
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
US750392A
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English (en)
Inventor
Joseph R Ioannilli
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.)
United Shoe Machinery Corp
Original Assignee
United Shoe Machinery Corp
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
Priority to FR1230924D priority Critical patent/FR1230924A/fr
Application filed by United Shoe Machinery Corp filed Critical United Shoe Machinery Corp
Priority to US750392A priority patent/US3054365A/en
Priority to CH7611359A priority patent/CH374879A/de
Application granted granted Critical
Publication of US3054365A publication Critical patent/US3054365A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C23/00—Tools; Devices not mentioned before for moulding
    • B22C23/02—Devices for coating moulds or cores
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B15/00—Machines for sewing leather goods
    • D05B15/02—Shoe sewing machines
    • D05B15/04—Shoe sewing machines for lock-stitch work
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B65/00—Devices for severing the needle or lower thread
    • D05B65/006—Devices for severing the needle or lower thread with heated tools

Definitions

  • the present invention relates to lock stitch shoe sole sewing machines and, more particularly, to improvements in the type of sewing machine which is provided with locking loop forming and inserting devices as distinguished from the type having a locking thread carrying shuttle, about which each loop of machine or needle thread is passed in forming a conventional lock stitch seam.
  • the invention is not limited to shoe sewing machines of the loop lock form but is capable of use to advantage with machines for insert ing stitches of other forms.
  • the invention is intended to facilitate and simplify the operation of machines similar to that disclosed in an application for United States Letters Patent Serial No. 543,321, filed October 28, 1955 in my name (now Patent No. 2,877,725, granted March 17, 1959).
  • a preferred practice therefore, still comprises severing thread from a shoe at the end of a seam by employing a hand-held knife and withdrawing only that amount of thread with the shoe at the end of a seam needed for severing closely to the shoe where the thread end will be inconspicuous.
  • the thread required in sewing shoes either with welts, insoles and uppers for an inseam or with welts and outsoles for an outseam is of such large size that the resistance offered to the passage of a knife edge contributes to the problem of severing the thread, which is generally impregnated with wax or other compound to lubricate its passage through the shoe parts, to seal the interstices between thread fibers against entry of contaminating materials and to seal the perforations formed by the stitches after insertion.
  • the difficulties are far greater than are met with light weight sewing machines employing a dry thread of a size which may readily be broken merely by tension exerted on the final stitch of a seam.
  • Other objects of the invention more particularly relating to a sewing machine having loop lock forming and inserting devices, include improving the arrangement and mode of operation for a needle loop retractor and a locking threaded loop carrying and inserting finger mechanism, so arranged that a more reliable construction than heretofore is obtained with greater durability and ease of operation than in the machine of the prior application. It is also :a purpose of the invention to improve the operation of the prior machine by the addition of thread pulloff devices acting in stopping and starting the machine to insure accurate and reliable positioning of the end of the thread remaining in the machine for successfully forming a new stitch in a seam.
  • threads ordinarily employed in sewing machines and particularly those of the shoe sole sewing type are subject to relatively heavy stresses approaching and frequently surpassing their yield points during normal sewing operations.
  • these yield points may reach an intensity of pounds under operating conditions of normal temperature and humidity.
  • the characteristics of thread are further improved by a moderate application of heat controlled carefully to avoid any approach to that temperature which will reduce the yield point appreciably.
  • One purpose for the thread treatment is to retain uniformly in the thread a maximum amount of tensile strength consistent with toughness and elastic capabilities.
  • the use of fiber modifying materials and moderate heat increases the difficulties met in the use of a knife edge for severing the thread in a sewing machine.
  • the present invention proposes the use of thread severing means arranged to be engaged with the thread at the end of a seam and heated to a relatively hightemperature above that which begins to reduce the tensile strength of the thread to such an extent that it is rendered capable of-unlimited yielding action under a relatively light pull exerted against the last formed stitch in the seam without displacing that stitch.
  • the heat of the severing means acts to evaporate the fiber modifying solutions on the thread and is constructed to be mounted directly on one member of a clamp for the Work piece, so close to the work-engaging surface thereof that the thread may be severed with an inconspicuous end remaining on the work piece without heating the Work piece to a temperature which will be injurious to the latter.
  • a nipper jaw also is mounted on the work clamp in a manner to deflect the thread into engagement with the heated severing member, so as to exert a severing pull on the thread, as well as to hold the severed end remaining in the machine at a position conducive to the proper formation of the first stitch in a new seam.
  • the severing means comprises an electrical resistance member, the tempera- 4 accomplished by connecting it to the driving and stopping mechanism.
  • FIG. 1 is a view in front elevationof the left hand portion of a shoe outsole stitching machine, including features of the present invention, parts of the machine having been broken away and reduced in height to enable the use of a larger scale in the remaining parts of the illustration.
  • the needle thread loop retractor co-operates with a loop spreader and the needle, each loop of needle thread being withdrawn from the work in the form of an open triangular loop which defines a plane at an angle to the line of the seam being inserted, together with actuating mechanism effective to cause the spreader to enter each loop of thread from that side of the point of operation opposite to the completed stitches of a scam, the retractor both engaging and lifting the thread from the needle hook with a continuous movement.
  • the loop lock stitch sewing machine of the prior application employs means for measuring a predetermined length of thread for each stitch and at least one thread lock co-op'erating with the measuring means is provided against which thread lock each stitch is set in the work.
  • means for measuring a predetermined length of thread for each stitch and at least one thread lock co-op'erating with the measuring means is provided against which thread lock each stitch is set in the work.
  • FIG. 2 is an enlarged view of a portion of the machine shown in FIG. 1;
  • FIG. 3 is a sectional view on an enlarged scale, looking along the line III-III of FIG. 2 and showing the position of a shoe at the end of a seam in the machine of that figure;
  • FIG. 4 is a view in rear elevation and on a slightly reduced scale of a portion of the driving and stopping mechanism in the machine;
  • FIG. 5 is a similar view on a larger scale of a portion of the mechanism shown in FIG. 4*but with additional parts broken away to illustrate more clearly the underlying parts of 'FIG. 4;
  • FIG. 6 is a detail view in right side elevation of a treadle connected part in the driving and stopping mechanism of FIG.'5;
  • FIG. 7 is a plan view of a portion of the same mechanism showing a locking thread pull-off with the parts illustrated in positions assumed while the machine is at FIG. 8 is a similar view of the parts of the locking thread pull-off in positions assumed while sewing operations are continuing;
  • FIG. 9 is a sectional detail view in rear elevation on a somewhat enlarged scale taken along the line IX--IX of FIG. 8;
  • FIG. 10 is a sectional detail view on a somewhat smaller scale, looking from the right side of the machine and illustrating the positions of the parts just before the machine comes to rest .at the end of a seam;
  • the 'thread'lock serves two purposes; one to assist the measuring means in withdrawing thread in the proper predetermined length from the supply for completion of each stitch in a seam and the other to prevent displacement of the thread end during operation of the pull-ofi at the end of the seam.
  • FIG. ll is a similar view of some of the parts in front of those shown in FIG. .10, illustrating their positions during sewing operations;
  • FIG. 12 is an enlarged front view of portions of the machine surrounding the point of sewing operations, illustrating a locking thread severing member
  • FIG. 13 is a detail view. in right side elevation showing the operations of the locking threadsevering member on a shoe illustrated in section;
  • FIG. 14 is a view in left side elevation of the locking thread severing member in a modified for-m having a thread directing guard to insure proper engagement of the thread therewith;
  • FIG. 16 is a sectional detail view in left side elevation illustrating a thread measuring action performed by the locking thread measuring member
  • FIG. 17 is a sectional detail view on a further enlarged scale of a locking thread friction device as viewed in the direction of the arrow XVII in FIG. 16;
  • FIG. 18 is a detail plan view of a needle thread severing member mounted on the work support ofthe machine, together with a thread end clamping device;
  • FIG. 20 is asectional detail'view in frontelevation and on a slightly enlarged scale, looking along the line XX-XX' of FIG. 18, and showing the construction of

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US750392A 1958-07-23 1958-07-23 Lockstitch shoe sole sewing machines Expired - Lifetime US3054365A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR1230924D FR1230924A (enrdf_load_stackoverflow) 1958-07-23
US750392A US3054365A (en) 1958-07-23 1958-07-23 Lockstitch shoe sole sewing machines
CH7611359A CH374879A (de) 1958-07-23 1959-07-23 Schuhnähmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US750392A US3054365A (en) 1958-07-23 1958-07-23 Lockstitch shoe sole sewing machines

Publications (1)

Publication Number Publication Date
US3054365A true US3054365A (en) 1962-09-18

Family

ID=25017680

Family Applications (1)

Application Number Title Priority Date Filing Date
US750392A Expired - Lifetime US3054365A (en) 1958-07-23 1958-07-23 Lockstitch shoe sole sewing machines

Country Status (3)

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US (1) US3054365A (enrdf_load_stackoverflow)
CH (1) CH374879A (enrdf_load_stackoverflow)
FR (1) FR1230924A (enrdf_load_stackoverflow)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4098208A (en) * 1976-07-17 1978-07-04 Pfaff Industriemaschinen Gmbh Sewing machine having a device for initiating the movement of the thread catcher of a thread cutting device

Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE311048C (enrdf_load_stackoverflow) *
DE310510C (enrdf_load_stackoverflow) *
US567888A (en) * 1896-09-15 Sewing-machine
US612150A (en) * 1898-10-11 Shoe-sewing machine
US1106800A (en) * 1895-05-20 1914-08-11 Goddu Sewing Machine Company Sewing-machine.
US1169909A (en) * 1910-10-03 1916-02-01 United Shoe Machinery Ab Sewing-machine.
US1194515A (en) * 1916-08-15 Oscar l
US1467284A (en) * 1917-05-28 1923-09-04 Blake C C Inc Thread-measuring mechanism for sewing machines
US2245796A (en) * 1936-01-18 1941-06-17 Frank A Larson Thread measuring and locking device for sewing machines
US2337611A (en) * 1940-08-17 1943-12-28 United Shoe Machinery Corp Shoe sewing machine
US2492147A (en) * 1947-07-30 1949-12-27 United Shoe Machinery Corp Thread holding and cutting device for shoe sewing machines
US2535294A (en) * 1947-04-10 1950-12-26 George N Kumbera Thread cutter
US2558353A (en) * 1948-02-17 1951-06-26 Norman M Zalkind Automatic trimmer foot
US2592463A (en) * 1946-10-10 1952-04-08 Warner Brothers Co Machine for cutting, processing, and/or seaming fabric or like sections and product thereof
US2619060A (en) * 1948-11-16 1952-11-25 United Shoe Machinery Corp Thread cutter for shoe sewing machines
US2877725A (en) * 1955-07-14 1959-03-17 United Shoe Machinery Corp Loop lock stitch shoe sewing machines

Patent Citations (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE311048C (enrdf_load_stackoverflow) *
DE310510C (enrdf_load_stackoverflow) *
US567888A (en) * 1896-09-15 Sewing-machine
US612150A (en) * 1898-10-11 Shoe-sewing machine
US1194515A (en) * 1916-08-15 Oscar l
US1106800A (en) * 1895-05-20 1914-08-11 Goddu Sewing Machine Company Sewing-machine.
US1169909A (en) * 1910-10-03 1916-02-01 United Shoe Machinery Ab Sewing-machine.
US1467284A (en) * 1917-05-28 1923-09-04 Blake C C Inc Thread-measuring mechanism for sewing machines
US2245796A (en) * 1936-01-18 1941-06-17 Frank A Larson Thread measuring and locking device for sewing machines
US2337611A (en) * 1940-08-17 1943-12-28 United Shoe Machinery Corp Shoe sewing machine
US2592463A (en) * 1946-10-10 1952-04-08 Warner Brothers Co Machine for cutting, processing, and/or seaming fabric or like sections and product thereof
US2535294A (en) * 1947-04-10 1950-12-26 George N Kumbera Thread cutter
US2492147A (en) * 1947-07-30 1949-12-27 United Shoe Machinery Corp Thread holding and cutting device for shoe sewing machines
US2558353A (en) * 1948-02-17 1951-06-26 Norman M Zalkind Automatic trimmer foot
US2619060A (en) * 1948-11-16 1952-11-25 United Shoe Machinery Corp Thread cutter for shoe sewing machines
US2877725A (en) * 1955-07-14 1959-03-17 United Shoe Machinery Corp Loop lock stitch shoe sewing machines

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4098208A (en) * 1976-07-17 1978-07-04 Pfaff Industriemaschinen Gmbh Sewing machine having a device for initiating the movement of the thread catcher of a thread cutting device

Also Published As

Publication number Publication date
CH374879A (de) 1964-01-31
FR1230924A (enrdf_load_stackoverflow) 1960-09-21

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