US3160127A - Adjusting means for a differential feed - Google Patents

Adjusting means for a differential feed Download PDF

Info

Publication number
US3160127A
US3160127A US179613A US17961362A US3160127A US 3160127 A US3160127 A US 3160127A US 179613 A US179613 A US 179613A US 17961362 A US17961362 A US 17961362A US 3160127 A US3160127 A US 3160127A
Authority
US
United States
Prior art keywords
shaft
setting
main
auxiliary
linkage
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
US179613A
Other languages
English (en)
Inventor
Orth Hans
Wenz Herbert
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GM Pfaff AG
Original Assignee
GM Pfaff AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by GM Pfaff AG filed Critical GM Pfaff AG
Application granted granted Critical
Publication of US3160127A publication Critical patent/US3160127A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B27/00—Work-feeding means
    • D05B27/02—Work-feeding means with feed dogs having horizontal and vertical movements
    • D05B27/08—Work-feeding means with feed dogs having horizontal and vertical movements with differential feed motions

Definitions

  • the invention relates to sewing machines and is particularly concerned with sewing machines of the type having a pair of feed dogs, a main feed dog and an auxiliary feed dog, each of which is provided with a stitch setting means, the positions of which are determined by the angular positions of setting shafts and wherein a spring biases the setting shaft for the main feed dog toward one direction of rotation.
  • this object is achieved by a coupling spring arranged in the rod connection between the two setting shafts Which elfects positive engagement of an abutment that is in contact with the setting shaft for the auxiliary feed dog against a counter abutment which has a connection with the gear rods of the main feed dog.
  • the coupling spring merely turns the setting shaft for the auxiliary feed dog in the same angular position as that of the setting shaft for the main feed dog so that its force is not directed against the tacking lever or manipulator.
  • the coupling spring is arranged in such a manner that its effective force is opposite to the effective force of the spring which engages the setting shaft for the man feed dog.
  • the coupling spring presses the setting shaft of the auxiliary feed dog into the same angular position as that of the shaft of the main feed dog against a minimum feed abutment of the auxiliary feed dog. This may be accomplished in different ways, such as with torsion springs or pull springs.
  • suitable pedal operation it is possible to obtain the increasing shirring which is desirable in 3,16%,i2? Fatented Dec. 8, 1964 machines of this type. The heavier the pressure on the pedal, the more shirring of the material is obtained.
  • FIG. 1 is a front elevational view of the machine
  • FIG. 2 is one embodiment of the setting device for the differential feed
  • FIG. 3 is a second embodiment of the new arrangement
  • FIG. 4 is a perspective view of the mechanism illustrating the arrangement of the feed dogs ad of the driving means therefor;
  • FIG. 5 is a view showing the coupling of FIG. 3 from the bottom taken in the direction of the arrow U.
  • the main setting shaft 2 for the main feed dog 35 and the auxiliary setting shaft 3 for the auxiliary feed dog 38 are journalled in the work plate 1 parallel relative to each other with a space therebetween, and are secured against axial movement by screws 6 mounted in bridge members '7 and having studs 5 extending into circumferential grooves 4
  • a linkage means including a linkage connecting member in the form of a two armed lever 8 is clamped onto main setting shaft 2 for the main feed dog 35 and has one arm connected to one end of a ball headed pull bar 9, the other end of which is connected to an arm of a two armed stitch setting lever 10.
  • the latter is mounted on a stitch setting shaft 11 journalled in the arm standard and extends with a ball headed end 12 of its other arm into a cam groove 13 in a rotatable setting disk 14 and which determines the feed length of the main feed dog 35.
  • a torsion spring 16 biased at one end against the work plate of the machine and at the other end against a screw 15 of the main setting shaft 2 turns the shaft 2 in a manner that by way of the pull bar 9 the ball head 12 of the stitch setting lever 10 comes to rest against the cam 13 at A.
  • a bridge 17 is rotataby mounted around the auxiliary setting shaft 3 for the auxiliary feed dog 38 and presents a linkage arm 17a which is connected by way of a connecting bar 18 with the other arm of the double armed lever 8.
  • a further shaft 27 is rotatably journalled. This shaft is driven in a manner not illustrated by way of a belt connected to the arm shaft of the machine.
  • Cams 28, 29 are secured to the shaft 27, and they are encompassed by cam bars 38, 31, respectively.
  • two coaxially arranged shafts 32, 33 are journalled in the base plate 1.
  • the inner shaft 33 extends partly from the shaft 32.
  • the forked lever 34 is firmly connected with the shaft 32, and the main feed dog 35 is linked thereto by means of the feed dog bar 36.
  • the forked lever 37 is firmly connected to the shaft 33, and the feed bar 39 which is provided with the auxiliary feed dog 38 is connected thereto.
  • the feed bars 36, 39 each have a forked end 40, 41, respectively, into which extend lifting cams 43, 44, respectively, which are secured to the shaft 42. As the shaft 42 rotates, the lifting cams 43, 44 impart the required lifting movements to the feed dogs 35, 38.
  • Two guide links 46, 47 are linked to the cam bar 38 by means of a bolt 45.
  • the guide link 46 is rotatably connected by means of a bolt 48 with a lever49 which is secured upon the setting shaft 2 or 182 of the main feed dog 35.
  • the guide link 47 is rotatably fastened by means of a bolt 50 to a lever 51 which is secured at its hub upon the shaft 32 of the main feed dog 35.
  • Two guide links 53, 54 are linked to the cam bar 31 by means of a bolt 52.
  • the guide link 53 is rotatably connected by means of a bolt 55 with a lever 56, which in turn is fastened to the auxiliary setting shaft 3 or 1113 of the auxiliary feed dog 38.
  • the guide links 54 is rota ably secured by means of a bolt 57 to a lever 58 which is secured at its hub upon the shaft 33 of the auxiliary feed dog 38.
  • the levers 49, 58 and guide links 46, 47 and 53, 54 have the same effective length.
  • a hollow shaft 130 provided with a. pawl 129 is arranged upon and fixedly secured to a stitch setting shaft 111 journalled in the standard of the machine. tened to this hollow shaft, to the end of which a ball headed draw bar 128 is linked which is connected to one arm of a linkage connecting member in the form of a two armed lever 127 that is secured to the auxiliary setting shaft 103 which is journalled in the work plate.
  • a second hollow shaft 133 is journalled on the hollow shaft 130 and is provided with a pawl or abutment member 132 and has fastened thereto a two armed stitch setting lever 110, one arm of which extends with the ball headed end 112 into the cam of a setting disk 14 arranged laterally of the standard of the machine for controlling the feed length of the feed dogs in the manner illustrated in FIG. 2.
  • a ball headed draw bar 109 is linked with one arm of linkage connecting means including a two armed lever 108 that is fixedly secured .to the main setting shaft 102 journalled in the work plate.
  • a pressure spring 116 biased at one end against the work plate and at the other end against the other arm of lever 198 turns the setting shaft 102 for the main feed dog 35 with the associated lever gearing in a manner that the ball headed end 112 of the arm of the stitch setting lever 110 engages the cam of setting disk 14.
  • a limiting or abutment member 134 which is rotatably mounted which is provided with two abutment screws 119 and 128, which are disposed in the path of movement of the pawl or abutment member 132 secured to the hollow shaft 133.
  • Two overload straps 136 which are connected with one another by a tension spring 135 are journalled in the limiting member 134 and press the pawl 129 fixed upon hollow shaft 130 into corresponding position with the abutment 137 provided upon the limiting member.
  • FIG. 4 shows the position of the linkage system for the zero position of the feed dogs 35, 38. In this position the junction of levers 49 or 56 defined by the bolts 48, 50 or 55, 57 is located at the guide links 46, 47 and 53, 54 in the projected imaginary axes of rotation 48, 50 and 55, 57.
  • the guide guide links 46, 47 and 53, 54 are pivotally moved about these axes of rota- Since the junction 50 or 57 is in alignment with the axes of rotation, no movement of the guide link 47 or 54 is transmitted to the lever 51 or 58, so that they as well as the shafts 32 and 33 are at a standstill.
  • the setting disk 14 (FIG. 2) is rotated manually ill]. a clockwise direction, then also the two setting shafts 2, 3 or 102, 103 rotate correspondingly by way of the associated linkage connections and thus assume the same angular position.
  • Each setting shaft is associated with a guide link system.
  • the axis of rotation 48 or 55 of the particular guide link system is adjusted by Way of lever 49 or 56 with respect to the junction 50 or 57, so that with the reciprocating movement of the cam bar'30 or 31 the guide link 46 or 53 effects a true rotary movement about the axis of rotation 48 or 55, while the guide link 47 or 54, besides being subject to this rotary movement, is also subjected to a lifting or thrust movement.
  • This thrust movement causes the lever 51 or 58 to effect a pivotal movement about the shaft 32 or 33.
  • the feed dog movement can be adjusted in a continuous manner.
  • the two feed dogs effect movements of the same magnitude.
  • the setting in the arrangement in accordance with FIG. 2' can be effected by means of setting screws 19, 20 below the base plate and in the arrangement in accordance with FIG. 3 with the setting screws 119, 120-above the base plate.
  • the setting screw 20 or 120 forward and turning back the screw 19 or 119, the angular position of the shaft 3 or 103 and the position of the guide link 53 are such that the guide mechanism 52-58 imparts to the auxiliary feed dog 38 a feed movement which is greater than that of the main feed dog 35.
  • Both of the coupling springs 23 or 123 of these arrangements press the setting shaft for the auxiliary feed dog against an adjustable abutment.
  • a predetermined maximum feed length is temporarily desired for the auxiliary feed dog, then it is possible by suitably turning back the set screws 19 or 119 to adjust the magnitude of feeding.
  • the maximum feed length is set by pressing down a pedal to which the draw bar 26 is linked which co-operates with a crank lever 25 which is secured to the setting shaft for the auxiliary feed dog.
  • the coupling spring 23 or 123 after release of the pedal reestablishes the original condition.
  • a stretching effect of the material is obtained in that the screw 20 or 120 is turned back and screw 19 or 119 is adjusted correspondingly.
  • the angular position of the setting shaft 2 or 102 and the setting of the guide link 46 then are such that the guide mechanism 46-51 imparts a feeding movement to the main feed dog 35 that is greater than that of the auxiliary feed dog 38.
  • the operating bar 24 or 124 is pressed against the pressure of spring 16 or 116, and thus the setting shafts for the main feed dog and for the auxiliary feed dog are rotated to such an extent by way of the connecting gear of the setting shafts that their direction of feed is reversed.
  • Mechanism for controlling the cooperation of a main feed dog and of an auxiliary feed dog to adjust the differential feed of a sewing machine comprising a main setting shaft for a main feed dog and an auxiliary setting shaft for an auxiliary feed dog, linkage means including a linkage connecting member for each said shaft, each disposed in fixed position on its respective shaft, and a linkage arm for each shaft, linkage connecting said linkage arms for transmitting movement from one said shaft to the other, an abutment member having at least one arm operatively associated with said linkage means, a stitch setting shaft including an operating bar and a stitch setting lever arm mounted on said stitch setting shaft and having an arm linked to said main setting shaft, a biasing spring imparting bias to said main setting shaft in one direction, a coupling spring arranged in said linkage means between said connecting members of said shafts and biasing said auxiliary dog setting shaft in a direction opposite to the bias of said main shaft, said coupling spring having at least one end in engagement with one said connecting member, and abutment means including said at least one arm
  • Mechanism for controlling the cooperation of a main feed dog and of an auxiliary feed dog to adjust the differential feed of a sewing machine comprising a main setting shaft for a main feed dog and an auxiliary setting shaft for an auxiliary feed dog, linkage means including a linkage connecting member for each said shaft, each disposed in fixed position on its respective shaft, and a linkage arm for each shaft, linkage connecting said linkage arms for transmitting movement from one said shaft to the other, an abutment member having at least one arm operatively associated with linkage means, a stitch setting shaft including an operating bar and a stitch setting lever arm mounted on said stitch setting shaft and having an arm linked to said main setting shaft,
  • a biasing spring imparting bias to said main setting shaft in one direction
  • a coupling spring arranged in said lnkage means between said connecting members of said shafts and biasing said auxiliary dog setting shaft in a direction opposite to the bias of said main shaft, said coupling spring having at least one end in engagement with one said connecting member, and abutment means including said at least one arm of said abutment member and adjustable abutment means biased by said coupling spring by way of said linkage means into force transmitting engagement with said one arm and compelling said auxiliary shaft to follow the movements of said main setting shaft, said coupling spring being a helical spring having one end connected to the connecting member of said auxiliary setting shaft and the other end to said abutment means, and said abutment means being disposed around said auxiliary setting shaft.
  • Mechanism for contnolling the cooperation of a main feed dog-and of an auxiliary feed dog to adjust the differential feed of a sewing machine comprising a main setting shaft for a main feed dog and an auxiliary setting shaft for an auxiliary feed dog, linkage means including a linkage connecting member for each said shaft, each disposed in fixed position on its respective shaft, and a linkage arm for each shaft, linkage connecting said linkage arms for transmitting movement from one said shaft to the other, an abutment member having at least one arm operatively associated with said linkage means, a stitch setting shaft including an op erating bar and a stitch setting lever arm mounted on said stitch setting shaft and having an arm linked to said main setting shaft, a biasing spring imparting bias to said main setting shaft in one direction, a coupling spring arranged in said linkage means between said connecting members of said shafts and biasing said auxiliary dog setting shaft in a direction opposite to the bias of said main shaft, said coupling spring having at least one end in engagement with one said connecting member, and a
  • Mechanism for controlling the cooperation of a main feed dog and of an auxiliary feed dog to adjust the differential feed of a sewing machine comprising a main setting shaft for a main feed dog and an auxiliary setting shaft for an auxiliary feed dog, linkage means including a linkage connecting member for each said shaft, each disposed in fixed position on its respective shaft, and a linkage arm for each shaft, linkage connecting said linkage arms for transmitting movement from one said shaft to the other, an abutment member having at least one arm operatively associated with said linkage means, a stitch setting shaft including an operating bar and a stitch setting lever arm mounted on said stitch setting shaft and having an arm linked to said main setting shaft, a biasing spring imparting bias to said main setting shaft in one direction, a coupling spring arranged in said linkage means between said connecting members of said shafts and biasing said auxiliary dog setting shaft in a direction opposite to the bias of said main shaft, said coupling spring having at least one end in engagement with one said connecting member, and abutment means including said at least one arm
  • Mechanism for controlling the cooperation of a main feed dog and of an auxiliary feed dog to adjust the diflerential feed of a sewing machine comprising a main setting shaft for a main feed dog and an auxiliary setting shaft for an auxiliary feed dog, linkage means including a linkage connecting member for each said shaft, each disposed in fixed position on its respective shaft, and a linkage arm for each shaft, linkage connecting said linkage arms for transmitting movement from one said shaft to the other, an abutment member operatively associated with said linkage means, a stitch setting shaft including an operating bar and a stitch setting lever arm mounted on said stitch setting shaft and having an arm linked to said main setting shaft, a biasing spring imparting bias to said main setting shaft in one direction, a coupling spring arranged in said linkage means between said connecting members of said shafts and biasing said auxiliary dog setting shaft in a direction opposite to the bias of said main shaft, said coupling spring having at least one end in engagement with one said connecting member, and abutment means comprising a double armed

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US179613A 1961-07-20 1962-03-14 Adjusting means for a differential feed Expired - Lifetime US3160127A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP27563A DE1125744B (de) 1961-07-20 1961-07-20 Einrichtung an Naehmaschinen mit einem Hauptstoffschieber und einem Hilfsstoffschieber zum Verstellen des Differential-Vorschubes

Publications (1)

Publication Number Publication Date
US3160127A true US3160127A (en) 1964-12-08

Family

ID=7370886

Family Applications (1)

Application Number Title Priority Date Filing Date
US179613A Expired - Lifetime US3160127A (en) 1961-07-20 1962-03-14 Adjusting means for a differential feed

Country Status (4)

Country Link
US (1) US3160127A (enrdf_load_stackoverflow)
JP (1) JPS499048B1 (enrdf_load_stackoverflow)
DE (1) DE1125744B (enrdf_load_stackoverflow)
GB (1) GB937339A (enrdf_load_stackoverflow)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4527497A (en) * 1982-12-27 1985-07-09 The Singer Company Differential feed system with safety device
US5014635A (en) * 1988-11-29 1991-05-14 Aisin Seiki Kabushiki Kaisha Device for controlling feeding quantity of a sewing machine

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
IT1073022B (it) * 1976-10-13 1985-04-13 Rockwell Rimoldi Spa Comando per un dispositivo di regolazione del trasporto differenziale di una macchina per cucire
JPS62148787A (ja) * 1985-12-23 1987-07-02 三和シヤツタ−工業株式会社 シヤツタ−
JPS62180191U (enrdf_load_stackoverflow) * 1986-05-06 1987-11-16

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2341448A (en) * 1941-05-07 1944-02-08 Singer Mfg Co Feeding mechanism for sewing machines
US2782742A (en) * 1951-06-30 1957-02-26 Hess Otto Sewing machine

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2341448A (en) * 1941-05-07 1944-02-08 Singer Mfg Co Feeding mechanism for sewing machines
US2782742A (en) * 1951-06-30 1957-02-26 Hess Otto Sewing machine

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4527497A (en) * 1982-12-27 1985-07-09 The Singer Company Differential feed system with safety device
US5014635A (en) * 1988-11-29 1991-05-14 Aisin Seiki Kabushiki Kaisha Device for controlling feeding quantity of a sewing machine

Also Published As

Publication number Publication date
JPS499048B1 (enrdf_load_stackoverflow) 1974-03-01
GB937339A (en) 1963-09-18
DE1125744B (de) 1962-03-15

Similar Documents

Publication Publication Date Title
US3160127A (en) Adjusting means for a differential feed
US3141428A (en) Wheel-feed mechanism for sewing machines
US4512272A (en) Sewing machine reversible feeding mechanism
GB1509055A (en) Workpiece feed device on sewing machines
US5182999A (en) Sewing machine feeder drive and stitch-length adjustment mechanism
US3636899A (en) Top feed mechanism for overedge sewing machine
US3301207A (en) Looper drive mechanism for chainstitch sewing machines
US3202121A (en) Differential feed control and indicator for sewing machines
US4633796A (en) Sewing machine material feeder
DE2155068C2 (de) Nähmaschine mit zwei relativ zur Näheinrichtung bewegbaren, trommelförmigen Stoffauflagestützen
US4271776A (en) Workpiece feeding device for a sewing machine
JPH0523465A (ja) ミシン
DE6926302U (de) Obertransportvorrichtung an naehmaschinen
US3262410A (en) Sewing machine work-feeding mechanism
GB1002888A (en) Improvements in or relating to stitch control mechanisms for sewing machines
DE843955C (de) Antriebseinrichtung fuer schrittweisen Vorschub bei umlaufenden Vorschubeinrichtungen an Naehmaschinen
US4328759A (en) Sewing machine with a stitch setting device
GB2121446A (en) Stitch adjustment device for sewing machines
SE304670B (enrdf_load_stackoverflow)
US4413582A (en) Workpiece feeding device for a sewing machine
CA1083889A (en) Adjustable feed member for sewing machines
JPS6143416Y2 (enrdf_load_stackoverflow)
DE492188C (de) Doppelsteppstichnaehmaschine fuer Schuhwerk mit einer beim Abstellen der Maschine sich loesenden Verbindung zwischen der Naehwelle und dem Nadeltraeger
GB971862A (en) Improvements in or relating to stitch controls for plural-feed sewing machines
US4425860A (en) Workpiece feeding device for a sewing machine