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WO1996001778A1 - Double bobine automatique - Google Patents

Double bobine automatique Download PDF

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Publication number
WO1996001778A1
WO1996001778A1 PCT/US1994/010480 US9410480W WO9601778A1 WO 1996001778 A1 WO1996001778 A1 WO 1996001778A1 US 9410480 W US9410480 W US 9410480W WO 9601778 A1 WO9601778 A1 WO 9601778A1
Authority
WO
WIPO (PCT)
Prior art keywords
bobbin
thread
bobbins
dual
housing
Prior art date
Application number
PCT/US1994/010480
Other languages
English (en)
Inventor
Steven Chang
Original Assignee
Steven Chang
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 Steven Chang filed Critical Steven Chang
Priority to AU77297/94A priority Critical patent/AU7729794A/en
Publication of WO1996001778A1 publication Critical patent/WO1996001778A1/fr

Links

Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B59/00—Applications of bobbin-winding or -changing devices; Indicating or control devices associated therewith
    • D05B59/04—Devices for changing the bobbin
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D05B57/28—Applications of bobbins for storing the lower thread
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B59/00—Applications of bobbin-winding or -changing devices; Indicating or control devices associated therewith

Definitions

  • An improvement in existing sewing machine bobbin transfer, replacement and respooling methods is provided whereby two bobbins are constantly kept together inside a housing which contains bobbin casings.
  • the housing is designed so that it can hold the bobbin casings, catch thread from the newly filled bobbin, cut said thread when commencing respooling and wrap the thread around the bobbin casings and sewing needle to complete required stitches.
  • “Male” and “female” type connectors between the bobbins allow them to spin in unison inside the casings. While one bobbin is supplying thread for stitching into the fabric, the other is being respooled. At a predetermined instant corresponding to the number of bobbin revolutions required to empty the full bobbin, the full and empty bobbins (and casings) are rotated inside the housing. Depending on the particular type of sewing machine the bobbins may be rotated automatically by electromechanical or electromagnetic means or manually by use of a lever arm attached to the bobbin casings.
  • Each bobbin casing is provided with a groove. Once the bobbins have switched positions, the bobbin thread (under tension) travels along the grooves from the full bobbin to the empty bobbin. A hook on the empty bobbin then catches this thread to enable respooling to commence.
  • Rovin et al. U.S. Patent No 4,002,130
  • the procedure of transferring the bobbins from rewinding to sewing positions requires various mechanical components including actuators, cams, gear drives, etc. which results in a bulky frame needing to be bolted to the existing sewing machine.
  • Mardix et al. (U.S. Patent No. 5,143,004) teaches a sewing apparatus which comprises a sewing needle, a bobbin for feeding thread to the sewing needle, a rotary housing containing the bobbin and its case, a sensor for sensing the non-feeding of thread to the sewing needle and an automatic extraction-loading device for extracting an empty bobbin and replacing it with a full one.
  • This automatic bobbin-reloading system also utilizes a series of rotary actuators, pistons, etc. to remove and refill bobbins.
  • an optical sensor to detect bobbin thread-breakage or -exhaustion further adds to the complexity of the device.
  • Kos as (U.S. Pat. No. 4,681,050) teaches a bobbin in run-out detector and bobbin changing mechanism.
  • the mechanism comprises a carriage which supports a rotatable turret that holds a pair of bobbins.
  • the run-out detector similar to that of Mardix, is also an optical sensor device. This machine however is limited in that upon detection of an empty bobbin, it must stop the sewing operation to rotate the turret to move the full bobbin into the sewing position, retract the empty bobbin and replace it with the full bobbin. Further, once the full bobbin is in position, an additional step to resynchronize the hook and bobbin is employed before sewing can continue.
  • the subject invention discloses such a device in that it is a single unit that replaces current bobbin assemblies. Two bobbins nestled in a side-by-side configuration "float" inside a housing and are never physically removed from the unit when transfer takes place. Rather, the bobbins rotate 180° within the housing from the "sewing" position to the "filling" position.
  • the end cap of the housing replaces the existing bobbin thread hook and the entire unit is connected directly to the main driveshaft of the sewing machine.
  • the thread is supplied by a single external source and constantly remains taut, allowing for automatic rethreading of the needle and refilling of the empty bobbin.
  • thread-exhaustion detection is linked directly to bobbin revolutions.
  • a preset value of revolutions is programmed into the machine (either by manual digital counter or by computerized monitoring) so that when the set value is reached, bobbin transfer is automatic. Since the preset value is determined by thread thickness and number of thread rotations on the bobbin, the bobbin is always fully exhausted when the preset value is reached.
  • Figure 1 is a side view of dual bobbin mechanism attached to the drive shaft of the sewing machine.
  • Figure 2 is a cross-sectional view of the dual bobbin mechanism attached to the driveshaft of the sewing machine.
  • Figure 3 is an exploded view of the dual bobbin mechanism.
  • Figure 4 is a perspective view of the left and right side bobbins removed from their casings.
  • Figure 5 is a top view of the left and right side bobbins removed from their casings.
  • Figure 6 is a perspective view of the left and right side bobbin casings with bobbins in place.
  • Figure 7 is top view of the left and right side bobbin casings with bobbins in place.
  • Figure 8 is an exploded perspective view of one bobbin casing, bobbin casing cap and retaining spring clip. Detailed Description of the Invention
  • a single housing containing two bobbins, thread hook and means for rotating and refilling bobbins replaces existing systems or components.
  • the mechanism is attached directly to the main driveshaft of the sewing machine thereby replacing the existing sewing head.
  • Thread for refilling the empty bobbin is supplied by the main thread supply, fed through the driveshaft and into the housing.
  • the number of revolutions required to empty a bobbin in the sewing position corresponds to revolutions required to fill a bobbin in the refilling position. Since this number is predetermined and programmed into the machine, transfer of bobbins is instantaneous and without waste or unexpected exhaustion of thread.
  • the preferred embodiment of the mechanism fully assembled and ready for operation is shown in Figure 1.
  • the mechanism should be fashioned from durable materials to minimize the effects of heat and/or warpage due to friction.
  • the housing (1) and thread hook housing cap (2) should be made of a metal or alloy, preferably steel, so as to maintain their dimensions and integrity during operation.
  • the unit is mounted on the outer rotating driveshaft (5) of the sewing machine which sits on the stationary inner shaft (6) .
  • the needle (4) is also shown in Figure 1 for the purpose of orienting the device with existing sewing machine components.
  • Figure 2 is a cross-sectional view of the dual bobbin mechanism.
  • the unit is attached to the outer driveshaft (5) by a set screw (8) which allows the unit to be removably secured to the machine for the purpose of servicing or replacement with the existing bobbin assembly.
  • the mechanism is provided with a brass sleeve bearing (7) between the inner shaft (6) and the outer driveshaft (5) . Since all models of sewing machines do not have the same bobbin configuration, the method by which the mechanism rotates on the shaft may also be by other means including ball or roller bearings.
  • the two bobbins (10 and 11) are oriented in a side by side manner.
  • the left side bobbin (10) is provided with a tab or protrusion on its outer edge (18) and the right side bobbin (11) is provided with a complementary indentation (19) on its outer side. They are held in position relative to one another inside the housing by bobbin casings (12 and 13) .
  • Each of the two casings are provided with covers (3 and 14) to provide access to the bobbins when necessary.
  • the covers are secured to the casings by means of a retaining spring clip (15) .
  • Each combined bobbin casing and cover is fashioned in a hemispherical shape so that when placed adjacent to each other, they form a nearly spherical body in which the bobbins (10 and 11) reside.
  • the inner surfaces of the housing (1) and thread hook housing cap (2) combine to form a spherical shape of nearly identical dimensions to those of the bobbin casings and covers.
  • FIG 3 is an exploded view of the unit.
  • the right side bobbin (11) fits inside the right side bobbin casing (13) .
  • the right side bobbin casing (13) is enclosed on one side by the right side bobbin casing cap (14) .
  • the bobbin casing cap is provided with a spring lever clip mechanism (15) to lock it in place on the casing as well as an axial shaft on which the right side bobbin (11) sits to permit free rotation of the bobbin within the casing.
  • the assembled right hand bobbin, casing, cap and clip then fits into the housing (1) .
  • the left side bobbin (10) is assembled into the left hand side of bobbin casing (12) with left side bobbin casing cover (3) and clip (15) in place in a similar manner.
  • FIG. 8 An exploded view of the left side bobbin casing, cover and clip is shown in greater detail in Figure 8.
  • the left hand bobbin casing (12) then fits inside the thread hook housing cap (2) .
  • the thread hook housing cap (2) is provided with male threads which then screw into place onto the housing (1) which is provided with female thread grooves to receive the thread hook housing cap (2) .
  • the entire unit is then inserted on the rotating outer drive shaft (5) of the sewing machine and secured by the set screw (8) .
  • FIG. 4 shows a side-by-side view of the bobbin casings removed from the housing with bobbins in place.
  • Both bobbin casings (12 and 13) contain grooves (20 and 21) cut into the casings to allow the thread from the main thread supply to pass from the filled bobbin to the empty bobbin during the bobbin switching process. The grooves further act as a needle pocket which allow the sewing needle (4) access to the thread during sewing.
  • a completely assembled dual bobbin housing will contain the following: a full left side bobbin with thread coming up through groove (20) to catch needle (4) , a right side bobbin empty whereby thread (9) from the main thread supply is hooked by the right side bobbin hook (17) so that refilling can commence, a manual digital counter or computerized monitor which counts bobbin revolutions and has been preset to the number of revolutions required to empty the full left side bobbin (10) .
  • sewing can commence. Sewing proceeds in a normal fashion with bobbin thread being hooked by thread hook housing cap (2) and fed around needle (4) and dual bobbin assembly to complete the required stitch pattern. Once the preset number of bobbin revolutions is reached, the left and right side bobbin casings (12 and 13) will automatically switch positions, i.e. left side will rotate 180° to right side and right side will rotate 180° to left side. Since the empty bobbin (11) was rotating at the same speed as full bobbin (10) , it was being refilled by the main thread supply at the same rate at which thread was being removed from full bobbin (10) .
  • the rotation of the bobbin casings may be effected by any means necessary and include but are not limited to electromagnetic, magnetic, or electromechanical means.
  • the means of counting the bobbin revolutions reach the preset value, it will trigger the mechanism for rotating the bobbin casings.
  • a lever arm connected to the housing can be operated to rotate the bobbin casings.
  • the thread (9) from the main thread supply is subsequently dragged around the bobbin casing during rotation.
  • the thread (9) from the main thread supply begins to travel across the groove (21) of the just-rotated casing (13) containing the full bobbin (11) through the groove (20) of casing (12) to the now empty bobbin (10) . Since the main thread supply is always under constant tension, thread (9) is compelled to travel along the grooves of the two bobbin casings until it reaches its original position at the extreme right side end of the now empty bobbin (10) . Sewing operation can then immediately recommence with the thread (9) being between the left side and right side bobbin casings, caught by the thread hook housing cap, cut by said hook, grabbed down by needle (4) and stitched.
  • this device results in momentarily halting the sewing process while bobbins are switched, thread hook and needle are prepared for next stitch and the empty bobbin is prepared for refilling.
  • the advantages of this mechanism over previous types of bobbin changing systems is that bobbins are never removed from their casings to effect respooling. Further, the simplicity of design eliminates the need for cumbersome bobbin switching means including carriages, cams, rotating arms, etc. This reduction in the number of moving parts reduces the possibility of breakdown due to frictional heat, build-up of residual thread fuzz around thread hook rotary, and loss of lubrication, thereby increasing reliability of the overall system and improving machine and operator efficiency.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

L'invention concerne un mécanisme automatique à deux bobines. Un logement (1) contenant deux bobines disposées côte à côte (10 et 11) avec l'aiguille à coudre (4) passant par une ouverture entre la paire de bobines remplace le système usuel à bobine unique. Les deux bobines coopèrent dans un système de traction, avec une bobine fournissant le fil supplémentaire à piquer dans le tissu, alors que l'autre bobine reçoit simultanément du fil d'une source externe. Lorsque la première bobine est vidée, les deux bobines sont tournées de 180° dans le logement. La seconde bobine, qui est maintenant pleine, est en position pour fournir le fil de piquage continu alors que la première bobine est en position pour être remplie du fil fourni par la source externe. On a également prévu un nouveau capuchon (2) pour le crochet à fil qui permet d'enfiler automatiquement le fil sur l'aiguille et de couper le fil arrivant de la source externe.
PCT/US1994/010480 1994-07-07 1994-09-16 Double bobine automatique WO1996001778A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU77297/94A AU7729794A (en) 1994-07-07 1994-09-16 Automatic dual bobbin

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US27185394A 1994-07-07 1994-07-07
US08/271,853 1994-07-07

Publications (1)

Publication Number Publication Date
WO1996001778A1 true WO1996001778A1 (fr) 1996-01-25

Family

ID=23037373

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1994/010480 WO1996001778A1 (fr) 1994-07-07 1994-09-16 Double bobine automatique

Country Status (2)

Country Link
AU (1) AU7729794A (fr)
WO (1) WO1996001778A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805719A (en) * 1972-11-13 1974-04-23 Chevrier A Lock stitch loop-taker attachment for sewing machines
US4002130A (en) * 1975-09-22 1977-01-11 Automatech Industries, Inc. Automatic bobbin rewinding for sewing machines
US4681050A (en) * 1983-02-23 1987-07-21 Nikolaos Kosmas Bobbin in run-out detector, and a bobbin changing mechanism incorporating the detector
US5143004A (en) * 1987-11-25 1992-09-01 Mardix Bar Cochva Sewing apparatus including automatic bobbin reloading

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3805719A (en) * 1972-11-13 1974-04-23 Chevrier A Lock stitch loop-taker attachment for sewing machines
US4002130A (en) * 1975-09-22 1977-01-11 Automatech Industries, Inc. Automatic bobbin rewinding for sewing machines
US4681050A (en) * 1983-02-23 1987-07-21 Nikolaos Kosmas Bobbin in run-out detector, and a bobbin changing mechanism incorporating the detector
US5143004A (en) * 1987-11-25 1992-09-01 Mardix Bar Cochva Sewing apparatus including automatic bobbin reloading

Also Published As

Publication number Publication date
AU7729794A (en) 1996-02-09

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