US2690725A - Means for automatically exchanging bobbins in sewing machines - Google Patents

Means for automatically exchanging bobbins in sewing machines Download PDF

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Publication number
US2690725A
US2690725A US381776A US38177653A US2690725A US 2690725 A US2690725 A US 2690725A US 381776 A US381776 A US 381776A US 38177653 A US38177653 A US 38177653A US 2690725 A US2690725 A US 2690725A
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Prior art keywords
looper
magazine
bobbin case
shifting shaft
bobbin
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US381776A
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English (en)
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Schumann Herbert
Clauss Emil
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GM Pfaff AG
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GM Pfaff AG
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    • 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

Definitions

  • This invention relates to certain improvements in the device for exchanging bobbins in sewing machines which has been described in our copending application Ser. No. 302,895.
  • the empty bobbin with bobbin case is seized by a grip claw carrier disposed axially parallel to the loop catch which executes a combination of axial and pivotal movements, is lifted from the seat in the loop catch and subsequently dropped during the pivotal movement of the grip claw carrier, while at the same time a bobbin case with a full bobbin is picked up from the magazine and deposited in the seat in the loop carrier.
  • a further object of the invention is to improve the cooperation between the grip claw carrier, the hook and the container or magazine feeding the full bobbins.
  • the shifting shaft which is arranged in the bed plate of the machine, parallel to the loop catch or looper shaft, with the grip claw carrier flxedly mounted thereon, is provided with a shift pin which is guided in straight and helical grooves or slots of a sleeve enclosing the shifting shaft.
  • the previous control mechanism for the grip claw carrier consisting of a springurged toothed rack and a cam, can be dispensed with whereby the device is simplified and its reliability increased. Also, the stitch-forming members arranged below the bed plate thus remain freely accessible.
  • a radial adjustment of the grip claw carrier is rendered possible.
  • Such adjustment permits accurate alignment of the claws in relation to the looper and the magazine which is preferably shaped in the form of a tubular cartridge.
  • 'Ihe releasing member for feeding the bobbin cases in the cartridge may suitably be provided on the holder of the cartridge for operation by a cam arranged on the shifting shaft of the control mechanism.
  • FIG. 1 is a perspective view of a sewing machine having the invention applied thereto, as viewed from below, with the device for mechanically changing the bobbins in the position of rest.
  • Fig. 2 is a perspective view of the shifting shaft with the control members, the compression spring, the catch member and the grip claw carrier.
  • Fig. 3 is a perspective view of the control case
  • Fig. 4 is a perspective view of a spring member for the control
  • Fig. 5 is a perspective view of a guide rod including the slide member
  • Fig. 6 is a side View of a discarding claw
  • Fig. 7 is a side view of an inserting claw
  • heFig. 8 is a perspective View o1'
  • Fig. 9 is a perspective view of a cartridge tube with cap
  • Fig. 10 is a perspective view of the insert of the cartridge
  • Fig. 11 is a cross-section of a guide pin, on the line XI-Xl of Fig. 10, and
  • Fig. 12 is a fragmentary perspective view of the machine and the bobbin exchanging device, viewed from below, with the cartridge holder in open position.
  • al1 parts of the bobbin. exchanging device are secured in and on the forward bearing body I and the rearward bearing body 2 for the looper shaft.
  • the shifting shaft 3 is mounted for axial and rotary motion in the forward bearing body I and in a casing 44 screwed to the rearward bearing body 2.
  • Two sleeve members 5 and 6 with complementary end faces surround the shifting shaft 3 and in their turn 'are accommodated in a tubular casing 4.
  • the sleeve member 5 is secured against changes of its position in an axial direction on the one hand by a nose 'l engaging the inner face of a recess B of the casing I and on the other hand by the bearing body 2 to which the casing 4 is screwed.
  • the member 6 is provided with a collar 9 which is urged against the casing 4 by a cover II screwed on a thread I0 of casing l.
  • the member 8 is secured against rotation by a pin I2 on the casing l which pin is engaged in a groove I3 of collar 9.
  • the sleeve member 5 is slightly adjustable in an angular or circumferential direction by two adjusting screws I4 and I5 in casing 4 which in turn is secured to the rearward bearing body 2 with the aid of two fixing pins I6 and embodiment of the invention is shown by way of ascrew I8 extending througha bore I1.
  • Each 0f the two sleeve members B'and 6 has ascenso two guide slots
  • the two slots are relatively displaced by 180". From the slots I9 and 20 only the upper ones are visible in Fig. 2.
  • a spring tongue 23 secured by a screw 22.
  • the front end 24 of the tongue is enlarged and fits in a. recess 25 of the sleeve member 5.
  • end 24 of the spring tongue is thickened and fitted on its under side to the outer diameter of the shifting shaft 3 and on its end face to the helical face of the sleeve member 6 which together with the adjacent helical face of the sleeve member forms a helical slot 26.
  • the angular or rotational adjustment of the sleeve member 5 by fractions of a millimeter does not impair the operation of the pin and slot connection, but is sunicient for accurate adjustment of the grip claws.
  • a compression spring 29 Clamped between the cover of the casing 4 and a catch 28 secured on the shifting shaft 3 by means of two screws 21 is a compression spring 29 with two washers 30. Said spring causes the return of the Ashifting shaft 3 into the position of rest and thus the lifting-out and swinging motion, through the pin and slot connection.
  • the front end of the shifting shaft 3 is provided with a groove 3
  • a guide rod 33 is secured on the forward bearing body by means of a screw 34 and by means of a screw 35 on the rearward bearing body 2.
  • Guided thereon is a slide member 36 whose fork 31 engages in an annular groove 38 of the catch 28.
  • a pin 39 of the slide member 36 forms the connecting element to the means for operating the device for exchanging the bobbins.
  • a grip claw carrier 40 is secured on the shifting shaft 3 by means of a conical pin 4
  • Leaf springs 41 are secured on the grip claw carrier 40 by means of screws 45 and press with their free ends on conical pins 48, Figs. 6 and 7, of the grip claws 44 and 45.
  • the two grip claws 44 and 45 differ from each other only by the formation of their hook-shaped members 49 and 50 which are rotatably mounted on a bridge member 5
  • the discarding claw 44 has a smooth hook member 49 and the inserting claw 45 has a hook member 50 provided with a nose 53 and serving to release the bobbin case B automatically from the grip claw when inserting a bobbin case B with full bobbin into the lopper of the machine, by the nose 53 striking against the lower part of the bobbin case and moving a hook 54 out of engagement with the bobbin case.
  • Both forms of the hook member have the same hook 54 and a set pin 55; they are under action of a compression spring 56 seated in a recess of bridge member 5
  • the effect of this arrangement is hereinafter described in greater detail.
  • is formed as a fork 6
  • a depression 52 for the screw 43 is provided on the upper cylindrical part of each of the grip claws.
  • a scraper 63 is guided in a groove 64 in the forward bearing body VI, parallelly to the looper shaft, and secured by means of a knurled screw S5 passing through a guide slot 66.
  • the parts becoming operative when stripping olf a bobbin case with empty bobbin are a cam surface 88 and a forcing pin 69 on the front end of the scraper 63.
  • a magazine or cartridge 10 having a mouthpiece 1
  • a bottom plate 16 has two guide pieces 11 and 18 of different size fitting in corresponding recesses 19 and 80 of the cartridge tube. Secured in the bottom plate 16 is a 'guide pin 8
  • has an approximately semicircular cross section with a guide ridge 86 which is provided with dwells or grooves 81, 88, and 89.
  • the head 90 of the guide pin is shaped similarly to the holding pin for the bobbin case in the looper of the machine, but the mushroom shape of the head which in case of the holding pin for the bobbin casing is formed by an annular groove, in this case is interrupted in that the guide pin cross section partly extends up to this head.
  • the bottom 85 of the feeding sleeve 82 is provided with a bevelled face 9
  • s provided with a guide groove 98 into which terminates a shift slot 91.
  • a recess 98 is provided for free passage of the bobbin case, since the wall of the mouthpiece opposed to the recess encloses the -bobbin case more closely than the tube oi' the container or magazine.
  • the magazine is secured in its position by a bore 99 in the magazine tube and a groove
  • the magazine holder substantially consists of a holder plate
  • is secured to the forward bearing body l of the machine by means of two screws
  • 09 projects through the carrier shell
  • a bent member I I0 is fastened on the holding plate
  • a releasing lever I I2 is pivotally mounted on the holding plate.
  • 5 is revolubly received in a recess of the holding plate
  • 02 is hingedly connected to the holding plate by means of a hinge pin
  • 02 is formed with a rectangularly bent-'off member forming a handle
  • the grip claw carrier 40 secured on the shifting shaft 3 is moved towards the looper of the machine and the magazine in such a manner that the discarding claw 44 seizes the empty bobbin casing in the looper and the inserting claw 45 seizes the full bobbin case in the magazine.
  • accurate angular adjustment of the grip claws being possible by adjustment of the sleeve member 5, and thus of the slots I9, by the screws I4 and i5 acting upon the nose 1.
  • the cam 32 which is freely movable on the shifting shaft 3 and guided in the groove 3
  • the inserting claw 45 inserts the full bobbin case into the looper, while the discarding claw 44 executes an idle stroke. Then follows a second revolving motion of 180 of the grip claw carrier.
  • the gripping of the bobbin cases by the grip claws 44 and 45 takes place in such a way that the bobbin case B is at rst engaged by the fork member 8l and then by the hook member 43 or 50.
  • the hook members are movably mounted n the bridge and acted upon by the compression spring 58, so that the hook 54 is permitted to slide over the nose
  • the adjustingpin 55 and thecatch devices on the bridges of the grip claws cooperate with the 6 scraper 83 in such a way that theadiusting pins Il run against the cam face 88 as the grip claw carrier 40 is swung, thereby being' moved in an anti-clockwise direction, referring to Figs.
  • the feeding sleeve 82 is urged against the bottom plate 18, with compression of the spiral spring 83, to such an extent that the slide or bobbin case hinge '8l catches in the groove Il.
  • the bobbin cases with full bobbins are threaded on the guide pin 8
  • is covered with bobbin cases throughout its free length, the feeding sleeve 82 is released from the groove 81 by digital pressure on the hook 94.
  • all bobbin cases, with the exception of the foremost one, are under the pressure of the helical spring 83.
  • the foremost bobbin case B is released from the pressure of the feeding spring because the bobbin case hinge of the next bobbin case is held in the groove 88.
  • the full insert is now introduced into the magazine 10.
  • the guide'members 11 and 18 of different size ensure the correct alignment of the bobbin cases in relation to the mouthpiece 1
  • the closure cap 12 is put In order to insert the magazine into the machine, it is urged into the downwardly swung shell
  • the inserting claw 45 at rst picks the foremost bobbin case B from the mouthpiece 1
  • the cam 32 moves the releasing lever
  • the bobbin case is released from the groove 88 and advanced by action of the helical spring 83, until its bobbin case hinge
  • 25 slides secures the bobbin case additionally against rotational displacement on the guide pin 8l.
  • the remailling supply of bobbin cases has been advanced by the length of one bobbin case, until the bobbin case hinge of the actual second bobbin case is held by the groove 88.
  • LA device for mechanically exchanging the bobbins in the looper of a sewing machine having a bed plate, a looper, and a looper shaft, said device comprising a magazine adapted to be filled with a plurality of bobbin cases with full bobbins.
  • a shifting shaft shiftably and rotatably mounted on the bed plate of the machine, parallel to the looper shaft, a grip claw carrier fixedly mounted nsl on said. shifting shaft and having a pair of grip claws, means for automatically and successively moving each of the bobbin cases in the magazine into a preparatory yielding position at the forward end thereof.
  • the shifting shaft for lifting the empty bobbin case from its seat in the looper and discarding it, picking up the next full bobbin case from the forward end of the magazine, and inserting said bobbin case into the looper in a position ready for sewing
  • the latter means comprising a guide pin secured in the shifting shaft, and a sleeve surrounding the shifting shaft and provided with straight and helical recesses for guiding said guide pin.
  • a device for mechanically exchanging 'the bobbins in the looper. of a sewing machine having a bed plate, a looper, a looper shaft, a forward and a rear bearing for the looper shaft said device comprising a magazine adapted to be filled with a plurality of bobbin cases withfull bobbins, a casing secured to the rearward bearing body, a shifting shaft shiftably and rotatably mounted in the forward bearing body and in said casing, a grip claw carrier xedly mounted on said shifting shaft and having a pair of grip claws, means for automatically and successively moving each of the bobbin cases in the magazine into a preparatory yielding position at the forward end thereof, and means for imparting 'a combination of axial and pivotal motions to said shifting shaft for lifting the .empty bobbin case from its seat in the looper and discarding it, picking up the acations ing a bed plate, a looper.
  • said device comprising a magazine adapted to be filled with a plurality of bobbin c ases'with full bobbins, a casing secured to the rearward bearing body, a shifting shaft shiftably and rotatably mounted in-the'forward bearing body and in said casing, a grip claw carrier flxedly mounted on said shifting shaft and hav-4 ing a pair of gripclaws, means for automatically and successively moving each of the bobbin cases in the magazine into a preparatory yielding position at the forward end thereof, and means for imparting a combination of axial and pivotal motionsto said shifting shaft for lifting the empty bobbin case from its seat in the looper and discarding it.
  • the latter means comprising a guide pin secured in the shifting shaft, and two complementary sleeve members accommodated in the casing and defining between their adjacent end faces straight and helical slots for guiding said guide pin, one of said sleeve members being rotatively adjustable.
  • a device for vmechanically exchanging the bobbins in the looper of a sewing machine having a bed plate, a looper, a looper shaft, a forward and a rearward bearing body for the looper shaft, said device comprising a magazine adapted to be filled with a plurality of bobbin cases with full bobbins, a casing secured to the rearward bearing body, a shifting shaft shiftably and rotatably mounted in the forward bearing body and in said casing, a grip claw carrier i'lxedly mounted on said shifting shaft and having a pair of grip claws, means for automatically and successively moving each of the bobbin cases in the magazine into a preparatory yielding position at the forward end thereof, and means for imparting a combination-of axial and pivotal motions to said shifting shaft for lifting next full bobbin case from the forward end of A the empty bobbin case from its seat in the looper and discarding it, picking up the next full bobbin case from the forward end of the magazine, and inserting said
  • a device for mechanically exchanging the bobbins in the looper of a sewing machine having a bed plate, a looper, and a looper shaft. a forward and a rearward bearing body for the looper shaft, said device comprising a magazine adapted to be filled with a plurality of bobbin cases with full bobbins, a casing secured to the rearward bearing body, a shifting shaft shiftably and rotatably mounted in the forward bearing body and in said casing, a grip claw carrier tlxedly mounted on said shifting shaft and having a pair of grip claws, means for automatically and successively moving each of the 'bobbin cases in the magazine into a preparatory yielding position at the forward end thereof, and means for imparting a combination of axial and pivotal motions to said shifting shaft for lifting the empty bobbin case from its seat in the looper and discarding it, picking up the 9 next full bobbin case from the forward end of the magazine, and inserting said bobbin case into the looper in a position ready
  • a device for mechanically exchanging the bobbins in the looper of a sewing machine havmg a bed plate, a looper, and a looper shaft, a forwardand a rearward bearing kfor the looper shaft
  • said device comprising a magazine adapted to be lled with a plurality of bobbin cases with full bobbins, a casing secured .to the rearward bearing body, a shifting shaft shiftably and rotatably mounted in the forward bearing body and in said casing, agrip claw carrier xedly mounted on said shifting shaft and having a pair of grip claws, means for automatically and successively moving each of the bobbin cases in the magazine into a preparatory yielding position at the forward end thereof, and means for imparting a -combination of axial and pivotal motions to said shifting shaft for lifting the emptybobbin case from its seat 'in the looper and discarding it, picking up the next full bobbin case from the forward end of the magazine, and inserting said bob
  • a device for mechanically exchanging the bobbins in the looper of a sewing machine having a bed plate, a looper, and a looper shaft, a forward and a rearward 'bearing for the' looper shaft said device comprising a magazine adapted to be filled with a plurality of bobbin cases with full bobbins, a casing secured to the rearward bearing body, a shifting shaft shiftably and rotatably mounted in the forward bearing body and in said casing, a grip claw carrier flxedly mounted on said shifting shaft and having a pair of grip claws, means for automatically and successively moving each of the bobbin cases in the magazine into a preparatory yielding position at the forward end thereof, and means for imparting a combination of axial and pivotal motions to said shifting shaft for lifting the empty bobbin case from'its seat in the looper and discarding it, picking up the next full bobbin case from the forward end of the magazine, and inserting said bobbin case into the looper in
  • a device for mechanically exchangingA the bobbins in the looper of a sewing machine having a bed plate, a looper, and a ⁇ looper shaft comprising a magazine adapted to be filled with a plurality of bobbin cases with full bobbins, a shifting shaft shiftably and rotatably mounted onv the bed plate, a grip clavP carrier fixedly mounted on said shaft and having a pair of grip claws, means 'for automatically and successively moving each .of the bobbin cases in the magazine into a preparatory yielding position at the forward end thereof, and means for imparting a combination of axial and pivotal motions to saidl shifting shaft for lifting the empty bobbin case from its seat in the looper and discarding it, picking up the next full bobbin case from the forward e ⁇ nd of the magazine, and inserting said bobbin case into the looper in a position ready for sewing, the latter means comprising a guide pin secured in the shifting shaft,
  • a sleeve surrounding the shifting shaft and provided with straight and helical recesses for guiding said guide pin, a movable hook member provided on the front end of each of the grip claws. a pressure spring acting upon said hook member, and an adjusting pin secured to the end of the hook member facing away from the point of the hook.
  • a device for mechanically exchanging the bobbins in the looper of a sewing machine having a bed plate, a looper,and a looper shaft comprising a magazine adapted to be filled with a plurality of bobbin cases with full bobbins, a shifting shaft shiftably and rotatably mounted on the bed plate, a grip claw carrier xedly v mounted on said shaft and having a pair of grip claws, each of said grip claws having a bridge with two vgrooves and a catch pin adapted to cooperate therewith, means for automatically and successively moving each of the bobbin cases in the magazine into a preparatory yielding posivtion at the forward end thereof, and means for imparting a combination of axial and pivotal motions to said shifting shaft for lifting the empty bobbin case from its seat in the looper and discarding it, picking up the next full bobbin case from the forward end of the magazine, and inserting said bobbin case into the looper in a position ready for sewing, the
  • a device for mechanically exchanging the bobbins in the looper of a sewing machine having a bedl plate, a looper, and a looper shaft comprising a magazine adapted to be filled with a plurality of bobbin cases with full bobbins, a shifting shaft shiftably and rotatably mounted on the bed plate, a grip claw carrier iixedly mounted on said shaft and having a pair of grip claws, one for lifting and discarding the empty and one for inserting the full bobbin and bobbin case, each of said grip claws having a bridge with two grooves and a catch pin adapted to cooperate therewith, means for automatically and successively moving each of the bobbin cases in the magazine into a preparatory yielding position at the forward end thereof, and means for imparting a combination of axial and pivotal motions to each shifting shaft for lifting the empty bobbin case from its seat in the looper and discardingit, picking up the next full'bobbin case from the forward end of the magazine, and inserting said
  • a'sleeve surrounding the shifting shaft and provided with straight and helical recesses for guiding said guide pin, a movable hook member provided on the front end of each of the grip claws, a pressure spring acting upon said hook member, and an adjusting pin secured to the end of the hook member facing away from the point of the hook, the hook member on the inserting grip claw being provided, on the side facing away from the pressure spring, with a nose projecting in the form of a ridge, whose lower face extends parallel to the direction of the hooks.
  • a device for mechanically exchanging the bobbins in the looper of a sewing machine having a bed plate, a. looper, and a looper shaft comprising a magazine adapted to be illled with a plurality of bobbin cases with full bobbins, a shifting shaft shiftably and rotatably mounted on the bed plate, a grip claw carrier xedly mounted on said shaft and having a pair ofgrip claws, means for automatically and successively moving each of the bobbin cases in the magazine into a preparatory yielding position at the forward end thereof, and means for imparting a combination of axial and pivotal motions to said shifting shaft for lifting the empty bobbin case from its seat in the looper and discarding it, picking up the next full bobbin case from the forward end of the magazine.
  • the latter means comprising a. guide pin secured in the shifting shaft, a sleeve surrounding the shifting shaft and provided with straight and helical recesses for guiding said guide pin, a scraper provided on the bed plate of the machine and being adiustable parallel to the looper shaft, said scraper having a forcing pin and a cam edge, and set pins arranged on the grip claws in such a way that the cam .edge projects into the path of travel of said Set pins.
  • a device for mechanically exchanging the bobbins in the looper of a sewing machine having a bed plate, a looper, and a looper shaft comprising a magazine adapted to be filled with a plurality of bobbin cases with full bobbins, said magazine having a guide pin whose front end is shaped similarly to the retaining pin for the bobbin case in the looper of the machine, a shifting shaft shiftably and rotatably mounted on the bed plate, a grip claw carrier fixedly mounted on said shaft and having a pair of grip claws, means for automatically and successively moving each of the bobbin cases in the magazine into a preparatory yielding position at the forward end thereof, and means for imparting a combination of axial and pivotal motions to said shifting shaft for lifting the empty bobbin case from its seat in the looper and discarding it, picking up the next full bobbin case from the forward end of the magazine, and inserting said bobbin case into the looper in a position ready for sewing, the latter means comprising
  • a device for mechanically exchanging the bobbins in the looper of a sewing machine having a bed plate, a looper, and alooper shaft, said del2 vice comprising a magazine adapted to be filled with a plurality of bobbin cases with full bobbins, said magazine having a guide pin whose front end is shaped similarly to the retaining pin for the bobbin case in the looper of the machine, said guide pin being provided with a guide ridge and with catch grooves in said guide ridge, a shifting shaft shiftably and rotatably mounted on the bed plate, a grip claw carrier ilxedly mounted on said shaft and having a pair of grip claws,
  • the latter means comprising a guide pin secured in the shifting shaft, and a sleeve surrounding the shifting shaft and provided with straight and helical recesses for guiding said guide pin.
  • a device for mechanically exchanging the bobbins in the looper of a sewing machine having a bed plate, a looper, and a looper shaft comprising a magazine adapted to be filled with a plurality of bobbin cases with full bobbins, said magazine having a guide pin whose front end is shaped similarly to the retaining pin for the bobbin case in the looper of the machine, said guide pin being provided with a guide ridge and .with catch grooves in said guide ridge, a bottom -plate in which said guide pin is secured and which is provided with guide members of different size, a shifting shaft shiftably and vrotatably mounted on the bed plate, a grip claw carrier fixedly mounted on said shaft and having 'a pair of grip claws, means for automatically and successively moving each of the bobbin cases in the magazine into a preparatory yielding position at the forward end thereof, and means for imparting a combination of axial and pivotal motions to said shifting shaft for lifting the empty bobbin case from its seat in
  • a device for mechanically vexchanging the bobbins in the looper of a sewing machine having a bed plate, a looper, and a looper shaft comprising a magazine adapted to be filled with a plurality of bobbin cases with full bobbins, 'said magazine having a guide pin whose front end is shaped similarly to the retaining pin for the bobbin case in the looper of the machine, said guide pin being provided with a guide ridge and with catch grooves in said guide ridge, a bottom plate in which said guide pin is secured and which is provided with guide members of different size, a shifting shaft shiftably and rotatably mounted on the bed plate, a grip claw carrier iixedly mounted on said shaft and having a pair of grip claws, means for automatically and successively moving each of the bobbin cases in the magazine into a preparatory yielding position atthe forward end thereof, and means for imparting a combination of axial and pivotal motions to said shifting shaft for lifting the empty bobbin
  • the latter means comprising a guide pin secured in the shafting shaft, a sleeve surrounding the shifting shaft and provided with straight and helical recesses for guiding said guide pin, and a feeding sleeve with stepped diameters and a shifting member shaped similarly to the upper part of a bobbin case.
  • a device for ⁇ mechanically exchanging the bobbins in the looper of a sewing machine having a bed plate, a looper, and a looper shaft said device comprising a magazine adapted to be lled with a plurality of bobbin cases with full bobbins, said magazine being provided with a safety bore and a safety groove and having a guide pin whose front end is shaped similarly to the retaining pin for the bobbin case in the looper of the machine, a shifting shaft shiftably and rotatably mounted on the bed plate, a grip claw carrier xedly mounted on said shaft and having a pair of 'grip claws, means for automatically and successively moving each of the bobbin cases in the magazine into a preparatory yielding position at the forward end thereof, and means for imparting a combination of axial and pivotal gnotions to said shifting shaft for lifting the empty bobbin case from its seat in the looper and discarding it, picking up the next full bobbin case from the forward end of the magazine, and in
  • a device for mechanically exchanging the bobbins in the looper of a sewing machine having a bed plate, a looper, and a looper shaft comprising a magazine adapted to be ililed with a plurality of bobbin cases with full bobbins, a bipartite magazine holder secured to the bed plate of the machine and including a safety angle member' fastened to the movable part and a safety pin inserted in the fixed part thereof, said magazine having a guide pin whose front end is shaped similarly to the retaining pin for the bobbin casein the looper of the machine, a shifting shaft shiftably and rotatably mounted on the bed plate, a grip claw carrier xedly mounted on said shaft and having a pair of grip claws, means for automatically and successively moving each of the bobbin cases in the magazine into a preparatory yielding position at the -forward end thereof, and means for imparting a combination of axial and pivotal motions to said shifting shaft for lifting the empty bobbin case
  • a device for mechanically exchanging the bobbins in the looper of a sewing machine having a bed plate, a looper, and a looper shaft comprising a magazine adapted to be filled with a plurality of bobbin cases with full bobbins, a bipartite magazine holder secured to the bed plate of the machine and including a safety angle 4member fastened to the movable part and a safety pin inserted in the fixed part thereof, a spring-urged releasing lever pivotally mounted on the magazine holder, said releasing lever engaging the cam of the shifting shaft and entering into the magazine in its swung-out position, through an opening in the magazine, said magazine having a guide pin whose front end is shaped similarly to the retaining pin for the bobbin case in the looper of the machine, a shifting shaft shiftably and rotatably mounted on the bed plate, and having a cam, a grip claw carrierfixcdly mounted on said shaft and having a pair of grip claws, means Afor automatically and successively moving each of

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Replacing, Conveying, And Pick-Finding For Filamentary Materials (AREA)
  • Spinning Or Twisting Of Yarns (AREA)
US381776A 1951-08-09 1953-09-23 Means for automatically exchanging bobbins in sewing machines Expired - Lifetime US2690725A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE309894X 1951-08-09
DE745185X 1952-09-24
DEP8418A DE947664C (de) 1951-08-09 1952-09-25 Einrichtung zum mechanischen Spulenwechsel bei Naehmaschinen

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US2690725A true US2690725A (en) 1954-10-05

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US2733676D Expired - Lifetime US2733676A (en) 1951-08-09 Device for automatically exchanging
US381776A Expired - Lifetime US2690725A (en) 1951-08-09 1953-09-23 Means for automatically exchanging bobbins in sewing machines

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US (2) US2690725A (fr)
CH (2) CH309894A (fr)
DE (1) DE947664C (fr)
FR (2) FR1064762A (fr)
GB (2) GB721975A (fr)
NL (1) NL93071C (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2808795A (en) * 1955-12-12 1957-10-08 New York Trust Company Automatic thread cutter for sewing machines
US3308777A (en) * 1963-06-26 1967-03-14 Mefina Sa Rotary hook sewing machine
US3376838A (en) * 1966-02-01 1968-04-09 Ivanhoe Res Corp Bobbin changer for sewing machines
US3747547A (en) * 1971-02-23 1973-07-24 Bobbin Monitor Corp Bobbin changing mechanism method and product
US4186677A (en) * 1978-05-08 1980-02-05 Sacchetti Alfred D Automatic color bobbin changer
WO1990015894A1 (fr) * 1989-06-22 1990-12-27 Carl Schmale Gmbh & Co. Kg Machine de remplacement automatique de canettes, notamment pour machines a coudre a point noue
US5315944A (en) * 1989-06-22 1994-05-31 Carl Schmale Gmbh Machine for automatically changing lower-thread bobbins
US5787826A (en) * 1995-05-08 1998-08-04 Vezzoli; Osvaldo Control for the automatic replacement of the lower thread bobbin for sewing machines
US20070056490A1 (en) * 2003-11-17 2007-03-15 Tokai Kogyo Mishin Kabushiki Kaisha Bobbin changer apparatus for sewing machine
US20080011213A1 (en) * 2006-07-11 2008-01-17 Tokai Kogyo Mishin Kabushiki Kaisha Bobbin changer apparatus for sewing machine

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NL265223A (fr) * 1960-05-28
US3145673A (en) * 1962-10-02 1964-08-25 Singer Co Control device for lock stitch sewing machine
US3981256A (en) * 1975-05-09 1976-09-21 J. P. Stevens & Co., Inc. Magnetic automatic bobbin changer for sewing machines
US4002130A (en) * 1975-09-22 1977-01-11 Automatech Industries, Inc. Automatic bobbin rewinding for sewing machines
US4223618A (en) * 1978-02-09 1980-09-23 Gateway Industries, Inc. Automatic bobbin changer and apparatus for a sewing machine
ATE30929T1 (de) * 1983-02-23 1987-12-15 Nikolaos Kosmas Austauschvorrichtung fuer greiferspule bei naehmaschine und leergangdetektor dafuer.
JP2733873B2 (ja) * 1989-06-22 1998-03-30 カルル シユマーレ ゲゼルシヤフト ミツト ベシユレンクテル ハフツング ウント コンパニー コマンデイトゲゼルシヤフト 本縫いミシン用の下糸ボビンを自動的に巻き上げかつ交換する機械
DE19913043C2 (de) * 1999-03-23 2001-09-27 Philipp Moll Einrichtung an Näh- oder Stickmaschinen zum Wechseln der Spule für den Greiferfaden

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US1087703A (en) * 1913-07-31 1914-02-17 Frank H Weitz Bobbin-holder ejector.
US2298871A (en) * 1940-11-08 1942-10-13 Willcox & Gibbs Sewing Machine Sewing machine
US2507470A (en) * 1946-10-17 1950-05-09 Willcox & Gibbs Sewing Machine Bobbin case removing and replacing mechanisms for sewing machines

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US906987A (en) * 1904-12-01 1908-12-15 Edmund Albert Angus Shuttle-replenishing mechanism.
AT103031B (de) * 1922-12-11 1926-04-10 Henry George Bedell Nähmaschine.

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US1087703A (en) * 1913-07-31 1914-02-17 Frank H Weitz Bobbin-holder ejector.
US2298871A (en) * 1940-11-08 1942-10-13 Willcox & Gibbs Sewing Machine Sewing machine
US2507470A (en) * 1946-10-17 1950-05-09 Willcox & Gibbs Sewing Machine Bobbin case removing and replacing mechanisms for sewing machines

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2808795A (en) * 1955-12-12 1957-10-08 New York Trust Company Automatic thread cutter for sewing machines
US3308777A (en) * 1963-06-26 1967-03-14 Mefina Sa Rotary hook sewing machine
US3376838A (en) * 1966-02-01 1968-04-09 Ivanhoe Res Corp Bobbin changer for sewing machines
US3747547A (en) * 1971-02-23 1973-07-24 Bobbin Monitor Corp Bobbin changing mechanism method and product
US4186677A (en) * 1978-05-08 1980-02-05 Sacchetti Alfred D Automatic color bobbin changer
WO1990015894A1 (fr) * 1989-06-22 1990-12-27 Carl Schmale Gmbh & Co. Kg Machine de remplacement automatique de canettes, notamment pour machines a coudre a point noue
US5315944A (en) * 1989-06-22 1994-05-31 Carl Schmale Gmbh Machine for automatically changing lower-thread bobbins
US5787826A (en) * 1995-05-08 1998-08-04 Vezzoli; Osvaldo Control for the automatic replacement of the lower thread bobbin for sewing machines
US20070056490A1 (en) * 2003-11-17 2007-03-15 Tokai Kogyo Mishin Kabushiki Kaisha Bobbin changer apparatus for sewing machine
US20080011213A1 (en) * 2006-07-11 2008-01-17 Tokai Kogyo Mishin Kabushiki Kaisha Bobbin changer apparatus for sewing machine
US7614354B2 (en) * 2006-07-11 2009-11-10 Tokai Kogyo Mishin Kabushiki Kaisha Bobbin changer apparatus for sewing machine
CN101104988B (zh) * 2006-07-11 2011-09-07 东海工业缝纫机株式会社 缝纫机的梭心更换装置

Also Published As

Publication number Publication date
GB721975A (en) 1955-01-19
DE947664C (de) 1956-08-23
GB745185A (en) 1956-02-22
US2733676A (en) 1956-02-07
CH338085A (de) 1959-04-30
NL93071C (fr)
CH309894A (de) 1955-09-30
FR1064762A (fr) 1954-05-18
FR65297E (fr) 1956-02-08

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