US3163138A - Needle positioning apparatus for powerdriven sewing machines - Google Patents

Needle positioning apparatus for powerdriven sewing machines Download PDF

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Publication number
US3163138A
US3163138A US276889A US27688963A US3163138A US 3163138 A US3163138 A US 3163138A US 276889 A US276889 A US 276889A US 27688963 A US27688963 A US 27688963A US 3163138 A US3163138 A US 3163138A
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United States
Prior art keywords
stop member
needle
shaft
motor
stop
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Expired - Lifetime
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US276889A
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English (en)
Inventor
Schenkengel Emerich
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GM Pfaff AG
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GM Pfaff AG
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Publication date
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Publication of US3163138A publication Critical patent/US3163138A/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/22—Devices for stopping drive when sewing tools have reached a predetermined position

Definitions

  • a desired predetermined position such as the up or down position, or position of withdrawal from or insertion in the work or fabric, respectively.
  • stopping in the up position is necessary for the threading of the needle or changing the position of the work, while the down position is required for the turning of the work relative to the needle during a sewing operation.
  • the desired positions may be adjusted manually in a known manner by rotation of the hand or balance wheel after the power drive has been disconnected or the machine brought to a stop.
  • FIG. 1 is an elevational view of a sewing machine embodying needle stop apparatus constructed in accordance with the principles of the invention
  • FIG. 2 is a partial perspective view more clearly showing the needle stop control mechanism embodied in FIG. 1, the position shown corresponding to the operative position of the parts in effecting a needle positioning operation;
  • FIG. 3 is an electrical wiring diagram of the control apparatus of the invention.
  • the invention involves generally the provision, in connection with a powerdriven sewing machine of the type having a drive shaft, an electric motor to drive said shaft, a reciprocating needle operably coupled with said shaft, such as through a crank or the like mechanism, control means to start and stop said motor for the carrying out of a sewing operation, and a work presser foot having actuating means, such as a conventional presser foot lifting lever, to operate the same between a first or lowered and work-engaging position and a second predetermined or raised position of disengagement from the work, of needle positioning apparatus comprising essentially a first stop member radially extending from and rotating together with said shaft, a second stationary and adjustable stop member, preferably in the form of a double lever pivotally supported upon the casing of the sewing machine.
  • Said second stop member is normally resiliently urged, by the action of a biasing spring or the like, to a retracted position, or position out of the path of rotation of the first stop member, to allow of free and unobstructed rotation of the machine during its normal use or operation.
  • auxiliary control and operating means being effective in response to the operation of the presser foot actuating means or lever to a position beyond said predetermined or raised position, in such a manner as to advance said second stop member into the path of said first stop member, to thereby arrest said shaft in a predetermined angular position by the first stop member forming an abutment upon restarting of the machine at a reduced operating speed.
  • the first stop member may have an angular position in relation to said shaft, or the needle oscillating path, respectively, such as to arrest or stop the'needle in the up position. In the same manner, displacement of the stop member by will result in the needle stoppage in the down position, as will be understood.
  • the driving motor is advantageously rotated at reduced speed during the needle positioning operations, such as by simultaneously controlling an auxiliary operating circuit in synchronism with the operation of said second stop member through a remote controlled auxiliary electric switch, or equivalent remote control and motor starting means.
  • the use of the presser foot lifting lever as a means to control the needle positioning apparatus in accordance with the underlying concept of the present invention has the advantage, among others, of simplicity of construction and ease of operation, whereby to render such a needle stop especially suitable for structural incorporation in conventional, including household-type, sewing machine. Further details regarding the operation of and the means for carrying into effect the invention will become more apparent from the following detailed description of the embodiment shown by the drawing.
  • the numeral 1, FIG. 1 denotes the sewing table of a conventional sewing machine comprising further a casing 2 composed in a known manner of an upright and overhanging arm being parallel to said table and terminating in a sewing head 3.
  • the drive or armshaft 4 mounted within the overhanging arm of the casing 2 is the drive or armshaft 4 carrying a flywheel 5 at one end and a crank 6 at its opposite end, the latter forming part of the coupling mechanism between said shaft and the reciprocating needle mounted in the head 3, in a manner well known to and understood by those skilled in the art.
  • a pulley 8 Secured to the shaft of an electric driving motor 7 mounted within the upright of the casing 2 is a pulley 8 which is coupled with the flywheel 5 through a transmission belt 9 or the like, to drive the shaft 4.
  • a brake or stop element it! which has a front edge 11 forming a shoulder or first stop member rotating together with the shaft 4.
  • a bracket 12 secured to the inside of the casing 2 serves as a support "for a double operating lever 13 being pivoted thereto by a screw 14 and forming a second adjustable stop cooperating with the rotating stop in the manner further I described in the following.
  • a second stop member 15 having a front edge 16 arranged relative to a projection 17 of the bracket 12, whereby the latter serves as an abutment to absorb the impact force upon the lever 13 upon the stop member 10 striking the member 15 as shown in the drawing during the operation of the device described in the following.
  • the opposite arm of the stopping lever 13 carries a pin 18 being parallel to the pivot axis and to the end of which is linked an operating rod or bar 19.
  • Bar 19 is provided with a pair of vertical longitudinal slots 21 and 22, the latter serving to guide said bar in the *vertical direction by the headed screw 24 passed through slot 22 and being secured to an angular support or bracket 23 mounted upon the inside of the casing 12.
  • the operating bar 19 and lever 13 are urged to a normal or inoperative position, such as by the action of a spring 27 having one end secured to the casing 2, as at 26, and having its opposite end secured to said lever, as at 25, whereby to cause the stop member 15 to be in retracted position from or out of the path of rotation of the stop member 10, as distinct from the operative or engaged position of the stops shown in the drawing.
  • the operating lever 13 is fitted with a further (vertical) arm 28 including an angle with the remaining lever arms and having linked to its upper end end a U-shaped connecting element 29 to which is, in turn, secured one of the ends of the flexible wire 39 of a Bowden cable 31 forming a remote control mechanism and leading to an auxiliary motor control provided for the carrying out of o a needle positioning operation.
  • a further (vertical) arm 28 including an angle with the remaining lever arms and having linked to its upper end end end a U-shaped connecting element 29 to which is, in turn, secured one of the ends of the flexible wire 39 of a Bowden cable 31 forming a remote control mechanism and leading to an auxiliary motor control provided for the carrying out of o a needle positioning operation.
  • Extending from the lever arm 28 below the element 2? is an auxiliary actuating member 32, in the form of a knurled rod or the like as shown, and projecting to the outside of the machine through a slot of the casing 2.
  • the Bowden mechanism comprises a threaded sleeve 34 passing the wire and being secured to a support 36 which is mounted upon the casing 2 by the aid of a screw 35 and held in place by a securing nut 37.
  • the core or wire 36 of the cable 31 extends into the interior of a control or switch box 38 being mounted below the sewing table 1, the end of the wire 34 forming a threaded portion 59 being fitted with an actuating member 40 which is fixed in position by a pair of securing nuts 41.
  • a compression spring 42 encircling the portion 39 of the wire 33.
  • an electric switch 43 preferably in the form of a snap or micro switch and having an actuating lug or the like 44 arranged to be engaged by the member 40 by a pull upon the wire 30 upon rotation of the operating lever 13 to its operative position shown in the draw- Journaled in a bore of the casing 2 is a pin or trunnion 45 to which is secured the presser foot lifting lever 46 by means of a screw 47.
  • a coupling pin 48 adapted to move within and to be coupled with the slot 21 of the connecting bar U.
  • the conventional presser foot lifting rod 49 may be supported at its upper end in a known manner by a bore and threaded sleeve (not shown) in the head 3 of the machine.
  • a compression spring 52 encircling the lifting rod 49 and engaging said threaded sleeve (not shown) at one end and engaging a lifting sleeve 53 secured to said rod at its opposite end, serves to normally urge the presser foot to the work-engaging or lowered position, while a lateral arm 54 connects the sleeve 53 with the actuating or lifting lever 46 for the raising and lowering of the presser foot, in a manner customary with conventional sewing machines.
  • the lead 55 connects one pole of the driving motor '7 with one terminal of a suitable power source the remaining terminal of which is connected, through the flexible lead 59, to the other pole of the motor through a conventional variable starting resistance 57 comprising an operating or sliding contact 58.
  • a suitable operating device such as a foot pedal (not shown) for the starting and normal operation of the motor during the carrying out of a sewing operation.
  • a lead 6i serially including the switch 43 which, in the example shown, comprises a pair of fixed contacts 61 and 62 and a bridging contact, to temporarily connect the motor to the power source through a predetermined portion of said resistance, to operate the motor at a reduced speed during a needle positioning operation, in a manner as will become further apparent from the following description of the operation of the invention.
  • Item 64 is a usual interference-suppression capacitor connected in parallel to the switch contacts 61 and s2.
  • the drive motor 7 of the sewing machine is energized by way of the starter-resistance 57 and slidable contact 58 to drive the machine via the pulley 8, belt 9 and the flywheel 5.
  • the starter ⁇ not shown) is returned to its rest position, as shown in FIG. 3, thereby arresting the machine at a random position of the shaft 5- and, in turn, of the needle within its oscillating path.
  • the pin 48 and slot 21 are so designed as to cause said pin to be normally disengaged from said slot, that is, in the lowered position of the presser foot, and to enter and engage said slot during raising of the presser foot for the operation of the lever 13 and stop member 15 into the path of the stop member 10, in the manner shown and described.
  • the switch contacts 61 and 62 are bridged or closed and the motor 7 energized through the resistance 57, in such a manner as to start rotation of the shaft 4 and, in turn, of the stop member 10 at a reduced speed, compared with the normal operating speed of the sewing machine, in the direction of the arrow A shown in the drawing, until the front edge 11 of the stop member It) strikes the front edge 16 of the stop member 15 in the manner shown, whereby to arrest the shaft 4 and with it the needle in a predetermined such as the up position, depending upon the design and relation of the members, as will be readily understood.
  • the needle may also be positioned in the lowered or workengaging position of the presser foot by the operation of the auxiliary member 32 towards the left, or in the direction of the arrow 13, whereby to again adjust the lever 13 and to control the switch 43 in substantially the same manner as described.
  • the coupling pin 48 is disengaged from the slot 21 of the connecting bar 19, whereby the latter will remain without effect on the presser foot or needle positioning operation, respectively.
  • needle positioning apparatus comprising an auxiliary operating circuit for said motor, to operate said motor at reduced speed compared with its normal operating speed, a first stop member carried by and rotating with said shaft, a second adjustable stop member, resilient means to normally urge said second stop member to a position of retraction from the path of rotation of said first stop member, an electrical switch in said auxiliary circuit, and common operating means effective in response to the operation of said presser clamp to an auxiliary position beyond said predetermined position, to advance said second stop member into the path of said first stop member against the action of said resilient means and to close said circuit and start said motor at reduced
  • said first stop member having an angular position relative to the needle oscillating path such as to arrest said shaft in the up position of said needle.
  • said second stop means being comprised of a double lever having a first arm carrying a stop operable into and out of the path of said first stop member, and means to operably connect the second arm of said lever with said presser clamp actuating means in said predetermined presser clamp position.
  • said needle being coupled with said shaft through a crank extending radially from said shaft and having a shoulder, and said first stop member being aflixed to the periphery of said shoulder.
  • said second stop member being comprised of a double lever having a first lever arm carrying an abutment element operable into and out of the path of said first stop member
  • said remote control means being comprised of a third arm of said lever including an angle to said first and second arms, and a Bowden cable connecting said third lever arm with said switch.
  • said second stop member being comprised of a double lever having a first arm carrying an abutment element operable into and out of the path of said first stop member, and means to couple said second arm with said presser foot actuating lever comprising a slidable member having one end linked to said second lever arm and provided with a slot, and a pin rotatable with said actuating lever and adapted to enter and effect operative connection with said slot in said raised presser foot bar position.
  • said motor control means comprising a variable starter resistance serially c-onnectible to a power source and said motor, and said auxiliary control means including a predetermined fractional portion of said resistance connectible to said source and motor by said switch.
  • needle positioning apparatus for sewing machines including means to independently operate said second stop member and switch, to carry out a needie positioning operation in the lowered position of said presser foot.
  • said first stop member being angularly related to said shaft such as to arrest said shaft in the up position of said needle.
  • said needle being coupled with said shaft through a crank extending radially from said shaft and having a shoulder, and said first stop member being afiixed to said shoulder.
  • needle positioning apparatus for sewing machines as claimed in claim 5, including a fixed abutment member adapted to absorb the impact force upon said second member upon engagement by said first stop member.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US276889A 1962-05-02 1963-04-30 Needle positioning apparatus for powerdriven sewing machines Expired - Lifetime US3163138A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEP29302A DE1149596B (de) 1962-05-02 1962-05-02 Einrichtung an Naehmaschinen mit elektromotorischem Antrieb zum Stillsetzen in einervorbestimmten Stellung der Nadelstange

Publications (1)

Publication Number Publication Date
US3163138A true US3163138A (en) 1964-12-29

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Application Number Title Priority Date Filing Date
US276889A Expired - Lifetime US3163138A (en) 1962-05-02 1963-04-30 Needle positioning apparatus for powerdriven sewing machines

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US (1) US3163138A (de)
AT (1) AT242486B (de)
CH (1) CH441961A (de)
DE (1) DE1149596B (de)
GB (1) GB964168A (de)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2277475A (en) * 1940-04-09 1942-03-24 Samuel B Bilger Sewing machine
US2921547A (en) * 1956-07-16 1960-01-19 Trimless Inc Needle positioning devices for sewing machines
US2962992A (en) * 1958-10-01 1960-12-06 Singer Mfg Co Control for electric sewing machines

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE184133C (de) *

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2277475A (en) * 1940-04-09 1942-03-24 Samuel B Bilger Sewing machine
US2921547A (en) * 1956-07-16 1960-01-19 Trimless Inc Needle positioning devices for sewing machines
US2962992A (en) * 1958-10-01 1960-12-06 Singer Mfg Co Control for electric sewing machines

Also Published As

Publication number Publication date
CH441961A (de) 1967-08-15
AT242486B (de) 1965-09-27
DE1149596B (de) 1963-05-30
GB964168A (en) 1964-07-15

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