US3104634A - Looptakers and thread case construction - Google Patents

Looptakers and thread case construction Download PDF

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Publication number
US3104634A
US3104634A US192250A US19225062A US3104634A US 3104634 A US3104634 A US 3104634A US 192250 A US192250 A US 192250A US 19225062 A US19225062 A US 19225062A US 3104634 A US3104634 A US 3104634A
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US
United States
Prior art keywords
thread
needle
case
nose
thread case
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
US192250A
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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
Application filed by United Shoe Machinery Corp filed Critical United Shoe Machinery Corp
Priority to US192250A priority Critical patent/US3104634A/en
Priority to FR933502A priority patent/FR1354088A/fr
Priority to CH553063A priority patent/CH407717A/de
Application granted granted Critical
Publication of US3104634A publication Critical patent/US3104634A/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
    • 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
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/08—Loop takers, e.g. loopers for lock-stitch sewing machines
    • D05B57/10—Shuttles
    • D05B57/14—Shuttles with rotary hooks

Definitions

  • a well known form of outsole stitcher comprises a curved hook needle and a looptaker in the form of a rotary hook for casting loops of thread withdrawn from the work by the needle about a stationary locking thread case inside the rotary hook to form stitches.
  • the rotary hook is journaled in a split raceway and driven by gears two or three revolutions during each sewing cycle.
  • the thread case is retained against rotation by a pair of alternately engaging reciprocating pins slidable in a stationary casing
  • the pins enter notches in the thread case and are alternately withdrawn to permit passage of the needle loop.
  • the rotary hook and thread case construction included in such conventional stitchers suffers from inadequate lubrication, an excessive rate of wear, noisy operataion and most importantly, a limitation on sewing speeds.
  • An important object of the present invention is accordingly to increase attainable sewing speeds of outsole stitchers.
  • a related object is to extend substantially the useful life of outsole stitchers operated at higher speedsthan have heretofore been attained.
  • Another object is to achieve economy in the manufacture of outsole stitchers by reducing the number and complexity of especially produced component parts.
  • Still another object is the reduction of noise and vibration attending the high speed operation of outsole stitchers.
  • the locking thread case is retained against rotation by a nose connected to the case by a releasable detent.
  • the nose is engaged by a fixed abutment member and as a result movingretainers such as the reciprocating pins described in connection with conventional machines are thus entirely eliminated.
  • the nose is formed with a surface over which the thread passes as the needle loop is being expanded by the rotary hook. The contour of the nose is also such that it.
  • the detent connecting the nose to the thread case is releasable to permit the thread case to revolve with the rotary hook without damage in the event that lint and thread fiber accumulations or other obstructions cause binding together of the hook and case.
  • FIG. 1 is a fragmentary view in front elevation of an outsole stitcher including a threadcase and rotary hook mounted and driven according to the present invention
  • FIG. 2 is a View in cross section taken along the line II-II of FIG. -1 and particularly depicting details of the rotary hook drive;
  • FIG. 3 is a view of parts of the rotary hook and locking thread case shown in FIGS. 1 and 2, here depicted in exploded relationship;
  • FIG. 4 is a view of the rear of the rotary hook and thread case assembly of FIG. 3, as viewed from the didirection of the arrow IV of FIG. 3;
  • FIG. 5 is a viewof the side of the thread case in which the rotary hook and thread case retainer abutment are fragmentarily illustrated in cross section.
  • the present invention is embodiedin a machine comprising a frame 10 shown fragmentarily in FIGS. 1 and 2 in which is journaled a sewing shaft 12 for operating Work feeding and stitch forming instrumentalities of the machine.
  • a work piece illustratedin FIG. 1 as consisting of an outsole 14 and a welt 16 rests on a Work support 18 and is clamped by a presser. foot 20, the work support and presser foot comprising a work clamp while being pierced by an awl 22 to form an opening for a curved hook needle 24.
  • the needle 24 penetrates through the work piece 14, 16 passing through an opening previously formed by theawl 22 and is threaded by a looper 26 which has previously laid the needle thread indicated at 28 behind a thread finger 30 for thread storage to be released later in the sewing cycle as the needle is withdrawn from the work.
  • a loop spreader 32 for entry of a looptaker or rotary hook beak 34.
  • the thread handling, work piercing and Work feeding devices described thus far are constructed and arranged in a conventional manner and form no part of the present invention which is directed more particularly to the means for interlocking the needle thread 28 with a locking thread 36 as will now be described. It will also be appreciated that for purposes of the present invention Work feed may be accomplished either continuously or intermittently by the work clamp, the awl, the needle or a combination of these.
  • a looptaker body 42 rotatably mounted on a supporting plate 44- by means of thin-race ball bearings 46.
  • the beak 34 is integral with the body 42 which at its outer end is connected to an annular pulley 48 providing a central passage for replenishment of a locking thread supply 50 as will be explained.
  • the central opening of the pulley 48 is counterbored at its outer end and the inner end of the pulley is of reduced diameter to clamp the inner races of the bearings 46 against a shoulder on the body 42, clamping pressure being applied by screws 52 passing loosely through the pulley and engaging the threads 'of'tapped holes in the looptaker body.
  • the outer races of the bearings 46 are seated in a counterbored opening in the plate 44 and are clamped therein by a thin retainer 54 which coincides in shape with the plate 44 and is secured to the plate by means of screws one of which is shown at 56 in FIG. 3.
  • a cup shaped thread case 58 Fitted inside the loopt-aker body 42, as best shown in FIGS. 3 to 5 inclusive, is a cup shaped thread case 58 formed with an interrupted flange 60 which engages a guideway 62 machined partly in the looptaker body and complemented by a portion 64 formed in an arcuate keeper 66.
  • the thread case in the looptaker assembly is free to remain stationary as the looptaker is rotated about it.
  • the keeper 66 is pinned to the body 42 by a dowel 68 and retained in position by three screws 70.
  • the thread case 58 includes an end wall surface 72 and an integral perforated stud 74.
  • a retainer nose 76 formed with a cylindrical shank 78 is received loosely within the stud 74 and is held in place by a screw 8t) having an enlarged slotted head which, with the outside of the stud 74, serves as a guide and retainer for a locking thread spool 82.
  • the nose 76 is tapered from a thin section coinciding with the central portion of the thread case to a section of maximum thickness at the eriphery of the thread case. In the thickest portion there is formed an opening in which is received a ball 84 backed by a compression spring 86.
  • the ball 84 enters a spherical depression or socket 88 in the surface 72, the ball and socket comprising a detent arrangement which cooperates with means to be described to hold the thread case against rotation with the looptaker under normal operating conditions but releases the thread case to revolve with the looptaker in the event that an obstruction causes binding of the thread case to the looptaker.
  • a flexible cogged belt 90 driven by a flanged pulley 92 mounted on an inclined intermediate shaft 94.
  • the cogs on the belt 90 enter grooves in the pulley 48 and 92 to maintain the proper time relationship between the looptaker and the other instrumentalities of the machine.
  • the shaft 94 carries a bevel gear pinion 96 meshing with a gear 98 keyed to the sewing shaft 12.
  • the tooth ratio of the pinion 96 and the gear 98 is 1 to 3 so that the beak 34 of the looptaker is driven through three complete revolutions for each revolution of the sewing shaft 12.
  • the support for the shaft 94 is designed both for ease and economy of manufacture and for. convenience and accessibility for maintenance.
  • the frame is formed with an integral hollow extension 100 terminating at its outer end in a shelf 102, to which the plate 44 is fixedly secured.
  • a headed sleeve 1414 Received withinthe extension 100 is a headed sleeve 1414 in which the shaft is journaled and which may be readily removed from the machine for replacement of component parts and for adjustment.
  • the shaft 94 is rotatable at its inner end in a double row thrust ball bearing 106, having a snap ring 1% entering a groove in its outer race to act as a shoulder.
  • the outer race is fixedly secured in the sleeve104 by a clamp ring 110 through which loosely pass screws 112 engaging the threads of tapped holes in the sleeve.
  • the shaft 94 rotates in a ball bearing 114, the outer race of which is pressed into the bore of the sleeve 104.
  • the inner races of the bearings 106,. 114 are clamped in position on the shaft 94 by a tubular spacer 116 and anut 118 threaded on the outer end of the shaft. Screws 120 clamp the sleeve 104 to the frame extension 106 and are quickly removed for Withdrawal of the sleeve in order to replace or adjust the pinion 96, or the bearings 1G6 and 114.
  • the thread case is retained against rotation with the looptaker by an upward projection 122, seen in FIGS. 1 and 2, which engages a sloping lead surface 124 of the nose 76, best seen in FIGS. 1 and 5,.
  • a tapered' passage 125 (FIG. 5 into which the needle loop enters after having been passed about the thread case in order to be released from the case as the needle loop is being contracted by conventional takeup action.
  • the nose 76 as seen in FIGS. 2 and 3, is formed with a concave differentially tapered back surface 130.
  • Such a configuration is advantageous in affording a high degree of control over the flow of the needle loop as will be appreciated from the showing of FIGS.'1 and 4 in which the forward leg of the needle loop at the time of entry of the beak 34 into the loop is identified by the reference character A and the rearward leg at the same time is over the open front of the case so that the loop isgiven A a half twist in the process of passing over the thread case.
  • FIG. 1 which represents maximum expansion of the needle loop theleg B here de-.
  • B has assumed a chordal position across the open end of the threadcase and the leg A here. denoted as A extends from the looptaker throat 136 over the ledge 134. drops off the ledge 134 and because of the shape of the back surface 139 of the nose continues to lag behind the leg B.
  • the relative positions of the legs after the leg A, has dropped off the ledge 134, are illustrated in FIG.
  • Another advantage inherent in the contour of the surface'130 is the fact that the leg A lies over a minimum thickness of the nose 76 so that in efiect the presence of the nose does not add appreciably v to the thread requirement of the loop and consequently has an insignificant effect on thread wear attributable to repeated passage of successive thread portions through the Work piece.
  • the bearings 46 upon which the looptaker is rotatably supported and the flexible shock absorbing upwardly biasing character of the drive provided by the belt 90 by assuring continued concentricity of looptaker rotation over an extended useful life contribute materially to the success of the present thread case retainer arrangement over an extended period of machine utilization.
  • the bearings 46 may include a quantity of sealed-in lubricant, wear is minimized without the risk of soiling the work piece.
  • FIG. 1 Another advantage of the present construction may be seen from FIG. 1 in which it will be observed that the axis of rotation of the looptaker is displaced laterally from the plane of the needle and the lower corner of the plate 44 has been cut away to provide an unobstructed view of the sewing point to the operator without increasing the thread requirement of the needle loop.
  • Another advantage lies in the fact that the line of centers of the pulleys 43 and 92 is inclined approximately 45 from the vertical, thereby removing the shaft 94 and the gearing 96, 98 from the most congested area directly behind the sewing point, an important factor in simplifying actuating connections for the needle, the awl and the work clamping instrumentalities, particularly in a single shaft machine in which the present invention is embodied.
  • stitch forming and thread manipulating instrumentalities including a hook needle for withdrawing from the work, carrying loops of needle thread, a cup shaped thread case having an inner end wall and enclosing a supply of locking thread, and a rotary looptaker formed with a beak for entering and passing the needle thread loops about the thread case, the combination of .a nose on the outside of the end Wall of the thread case, fixed abutment means engaging the nose to retain the thread case against rotation, and driving means including a cogged belt for continuously rotating the looptaker in timed relation with the needle and other stitch forming and thread manipulating instrumentalities.
  • a lock stitch shoe outsole sewing machine having a sewing shaft, a work support, stitch fonrning and thread manipulating instrumentalities including a curved hook needle for withdrawing from the work, carrying loops of needle thread, a cup shaped thread case having an inner end wall and enclosing a supply of locking thread, and a rotary looptaker formed with a beak for entering and passing the needle thread loops about the thread case, the combination of a nose on the outside of the end wall of the thread case, fixed abutment means engaging the nose to retain the thread case against rotation in either direction, an inclined shaft driven by the sewing shaft and a cogged belt for continuously rotating the looptaker in timed relation to the sewing shaft.
  • a lock stitch shoe outsole sewing machine having a sewing shaft, a work support, stitch forming and thread manipulating instrumentalities including a curved hook needle for withdrawing from the work, carrying loops of needle thread, a cup shaped thread case having an inner end wall and enclosing a supply of locking thread, and a rotary looptaker formed with a beak for entering and passing the needle thread loops about the thread case, the combination of a nose on the outside of the end wall of the thread case, abutment means engaging the nose to retain the thread case against rotation and defining with the nose a tapered passage for the loops, an inclined shaft driven by the sewing shaft and a cogged belt connecting the inclined shaft and the lo-optaker for continuously rotating the looptaker in timed relation to the sewing shaft.
  • stitch forming and thread manipulating instrumentalities including a hook needle for withdrawing from the work, carrying loops of needle thread, a cup shaped thread case having an end wall and enclosing a supply of locking thread, and a rotary looptaker formed with a beak for entering and passing the needle thread loops about the thread case, the combination of a nose on the outside of the end wall of the thread case, detent means releasably coupling the nose to the thread case under conditions of normal torque and abutment means engaging the nose to retain the thread case against rotation.
  • stitch forming and thread manipulating instrumentalities including a hook needle for withdrawing from the work, carrying loops of needle thread, a cup shaped thread case having an end wall and enclosing a supply of locking thread, and a rotary looptaker formed with a beak for entering and passing the needle thread loops about the thread case, the combination of a nose pivotally mounted concentrically with the loopt-aker on the outside of the end Wall of the thread case, detent means releasably coupling the nose member to the thread case under conditions of normal torque and abutment means engaging the nose to retain the thread case against rotation.
  • stitch forming and thread manipulating instrumentalities including a hook needle for withdrawingfro-rn the work, carrying loops of needle thread, a cup shaped thread case having an end wall and enclosing a supply of locking thread, and a rotary looptaker formed with a beak for entering and passing the.
  • a nose releasably coupled to the outside end wall of the thread case, the nose being formed with a concave surface over which the needle loop flows in being passed about the thread case, and an abutment means engaging the nose to retain the thread case against rotation.
  • stitch forming and thread manipulating instrumentalities including a hook needle for Withdrawing from the work, carrying loops of needle thread, a cup shaped thread case having an end wall and enclosing a supply of locking thread, and a rotary looptaker formed with a beak for entering and passin the needle thread loops about the thread case, the combination of a nose releasably coupled to the outside end wall of the thread case, the nose being formed with a concave surface over which the needle loop flows in being passed about the thread case and a sloping lead surfiace "and a projection engaging the nose to retain the thread case against rotation and defining with the sloping lead surescape from the thread case.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US192250A 1962-05-03 1962-05-03 Looptakers and thread case construction Expired - Lifetime US3104634A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
US192250A US3104634A (en) 1962-05-03 1962-05-03 Looptakers and thread case construction
FR933502A FR1354088A (fr) 1962-05-03 1963-05-02 Machine à coudre les chaussures à points noués
CH553063A CH407717A (de) 1962-05-03 1963-05-02 Doppelsteppstichschuhnähmaschine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US192250A US3104634A (en) 1962-05-03 1962-05-03 Looptakers and thread case construction

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US3104634A true US3104634A (en) 1963-09-24

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CH (1) CH407717A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267893A (en) * 1963-05-22 1966-08-23 United Shoe Machinery Corp Thread case kicker mechanisms
US3307509A (en) * 1964-12-31 1967-03-07 United Shoe Machinery Corp Outsole sewing machines

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2049369A (en) * 1936-07-28 Lockstitch sewing machine
US2780188A (en) * 1952-07-05 1957-02-05 United Shoe Machinery Corp Lockstitch sewing machines
US3038429A (en) * 1960-03-04 1962-06-12 Singer Mfg Co Lock stitch sewing machine

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2049369A (en) * 1936-07-28 Lockstitch sewing machine
US2780188A (en) * 1952-07-05 1957-02-05 United Shoe Machinery Corp Lockstitch sewing machines
US3038429A (en) * 1960-03-04 1962-06-12 Singer Mfg Co Lock stitch sewing machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267893A (en) * 1963-05-22 1966-08-23 United Shoe Machinery Corp Thread case kicker mechanisms
US3307509A (en) * 1964-12-31 1967-03-07 United Shoe Machinery Corp Outsole sewing machines

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Publication number Publication date
CH407717A (de) 1966-02-15

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