US3563196A - Drive arrangement for sewing machines - Google Patents

Drive arrangement for sewing machines Download PDF

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Publication number
US3563196A
US3563196A US834691A US3563196DA US3563196A US 3563196 A US3563196 A US 3563196A US 834691 A US834691 A US 834691A US 3563196D A US3563196D A US 3563196DA US 3563196 A US3563196 A US 3563196A
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United States
Prior art keywords
countershaft
shaft
drive
belt
support
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Expired - Lifetime
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US834691A
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English (en)
Inventor
Karl Nicolay
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Duerkoppwerke GmbH
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Duerkoppwerke GmbH
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Publication date
Application filed by Duerkoppwerke GmbH filed Critical Duerkoppwerke GmbH
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Publication of US3563196A publication Critical patent/US3563196A/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/10—Electrical or electromagnetic drives
    • D05B69/12—Electrical or electromagnetic drives using rotary electric motors

Definitions

  • the drive arrangement comprises an electric motor whose countershaft is provided with belt drive sheaves at axially spaced locations thereon.
  • the countershaft is pivoted relating to the motor assembly below the fabric feed table of the machine about an axis laterally offset from the shaft axis but parallel thereto and against a spring establishing belt tension.
  • the machine arm or head is tiltable about a horizontal axis and entrains the countershaft with it to eliminate the need for disconnecting the belts passing around the needle-driveshaft pulley and one of the sheaves.
  • buttonhole-stitching machines which may be automatically or manually operated to stitch the border of a closed area which may be cutthrough to constitute an eyelet or buttonhole.
  • Such machines can be generically described as buttonholestitching machines even though the formations produced in the fabric may be eyelets or have other functions than that of receiving a button.
  • such machines have a fabric feed table and a post upstanding therefrom.
  • a horizontal arm extends from the post in a cantilever structure and defines at the end of this arm, remote from the post a sewing machine head in which an upright needle is reciprocable toward and away from the fabric feed table.
  • the head may also include apressure foot, a camshaft arrangement for driving the needle, a zigzag drive arrangement or the like.
  • the post of the machine is usually provided with a needle drive shaft carrying a pulley (needle drive pulley) which may be connected to an electric motor or to a shaft in common with a number of such machines which, in turn, is driven by an electric motor.
  • a needle drive shaft carrying a pulley needle drive pulley
  • the post of the machine is usually provided with a needle drive shaft carrying a pulley (needle drive pulley) which may be connected to an electric motor or to a shaft in common with a number of such machines which, in turn, is driven by an electric motor.
  • a socket-shaped base upon which the sewing machine arm and table are mounted.
  • this base it is known to provide a stitch-forming mechanism which is designed to grip the thread through the fabric by the needle to form the stitch, which may be a chainstitch, double-chainstitch or the like.
  • the stitch-forming means may include a gripper adapted to form loops in the threads below the worktable, means for feeding a gimp cord or fillet into the stitching location for incorporationin the stitch as a reinforcing or filler member. 7
  • the drive beneath the table may operate cutter means or the like for severing the cord or thread, cutting the fabric etc.
  • cutter means or the like for severing the cord or thread, cutting the fabric etc.
  • the stitch-forming mechanism below the worktable includes a drive shaft (stitch-former drive shaft) r mounted in the base or housing of the sewing machine and driven independently of the needlejdr'ive shaft.
  • a drive shaft switch-former drive shaft
  • the stitch-former drive shaft and the needle drive shaft are independent operation of the stitch-former drive shaft and the needle drive shaft. They may, of course, be operated by a common drive source without diminishing the independent relationship under discussion.
  • the principal object of the present invention to provide an improved drive assembly for sewing machines of the character described in which casting off of the belt from a pulley is no longer required when the arm is to be tilted.
  • Another object of this invention is t to provide an improved drive mechanism for a buttonhole-stitching machine of the general character described.
  • the drive motor is flexibly coupled, according to an essential feature of the present invention, with a countershaft mounted for swinging movement relative to the motor shaft, and carrying a drive pulley which is connected to the needle drive pulley by a respective belt.
  • the pivotal axis of the lever carrying the countershaft and the axis of rotation thereof do not deviate substantially from codirectionality with the shaft of the needle drive assembly.
  • the countershaft is connected at one end via a compensating coupling, flexible coupling or universal joint with the drive motor and at the other end is journaled in a lever which is fulcrumed upon a pivot rod or axle extending parallel to the countershaft.
  • the swinging stroke of the lever is, moreover, adjustably established between a pair of stops and a spring is provided to urge the lever downwardly to apply the desired tension to the belts.
  • the spring moreover, isset to yield before the tensile limit of the belt is reached, thereby precluding breakage of the belt when the sewing machine arm is swung upwardly.
  • the countershaft is, therefore, swi'ngable about its coupling at the motor side thereof, the compensating coupling being constituted, for example, as a flexible joint permitting alignment or disalignment of the motor shaft with respect to the countershaft.
  • the motor shaft may be keyed to a drive pulley which is connected by a further belt to the drive member of the mechanism within the base of the machine.
  • the needle drive shaft and its pulleyand the stitch-former drive shaft and pulley have horizontal axes lying in different vertical planes.
  • the pulleys on the countershaft and motor shaft, according to the present invention - lie directly below the needle drive pulley and the stitch-former drive pulley, the countershaft and the pivot axis thereof running athwart the base of the machine and substantially diagonally with respect-to the two shaftsof the machine and at an inclination to .the vertical planes thereof.
  • FIG. 1 is a front view of a buttonhole sewing machine provided with the drive of the present invention
  • FIG. 2 is a cross-sectional view taken along the line II-ll of FIG. 1, but illustrating with dot-dash. lines bind the plane of the section;
  • FIG. 3 is a left-sideelevational view of the machine assembly of FIG. ,1;
  • FIG. 4 is a right side elevational view thereof;
  • FIG. 5 is a view similar to FIG. '4 showing the machine arm in another position;
  • FIG. 6 is a detail view of a portion of the machine.
  • the sewing machine of the present invention comprises an upwardly open base ,2,contain ing a stitch-forming mechanism driven by the stitch-former drive shaft 4 extending laterally to the left and having ,a horizOntal axis as shown in FIG. 2.
  • the base 2 is mounted upon a support table 19 and receives.
  • a pivotal worktablejl' surmounted by an upright post 1"" carrying the arm ltwhose portions lying be head 1" receives a vertically reciprocable needle assembly 1a which, via the drive unit 9:; is operated by the needle drive shaft 9.
  • the arm assembly 1 is pivotally mounted on the support 2 at a horizOntal pivot 3 which extends parallel to the horizontalaxis of the shafts 4 and 9.
  • the shaft 4 lies in a lower horizontal plane than the axis of pivot 3 and carries a V-belt pulley 5 which, in turn, is connected by the crossed V-belt 6 with the V-belt sheave 7 on the countershaft 8.
  • the needle drive shaft 9 extends laterally to the right (FIG. 4); and in' a vertical plane different from that of pivot 3 or the axis of shaft 4 (H6. 3) and in a horizontal plane above the pivot 3.
  • the shaft 9 carries a handwheel 9b which may be rotated by the operator to manually raise or lower the needle s assembly, and a V-belt pulley 10 connected by an uncrossed V-belt 11 with a V-belt sheave secured to the countershaft 8.
  • the pulleys 5 and 10 lie in different vertical planes and the pulleys 7 and 12 are disposed directly beneath them, so that the belts 6 and 11 lie substantially in vertical planes.
  • the crossed belt 6 of the belt drive 5, 6, 7 does not have its upwardly and downwardly extending stretches in contact at the crossover point and V-belts can be used without stress which would cause deterioration of these belts belts.
  • the drive is turned on, the shafts 4 and 9 of the buttonhole-stitching machine are driven continuously and the machine may be assembled in batteries with other similar machines and/or controlled automatically by a programming system as described in the aforementioned patent and application and machines of the same class.
  • the shaft 8 carrying the V-belt pulley 12 has a journaled extremity 8a projecting axially beyond the pulley l2 and rotatable within a spherical roller bearing 13 of the type illustrated and described at page 13-2 of Mechanical Design and Systems Handbook, Rothbart, McGraw-Hill Book Company, N.Y., 1964.
  • the bearing l3 is held in place by a washer 8b on the shaft and 8a and is received in the free end of a lever or arm 14.
  • Arm 14 has a split hub 14a (see also FIG. 6) which releasably receives a bushing 22 whose head 22a is constituted by an outwardly extending flange at the outer end of this bushing forming a shoulder which rests against the hub 14a.
  • a nut 28 is threaded on to the right-hand end of a fixed pivot axle 15 which is supported in a pair ofjournal blocks 20, 21 depending on respective arms from theunderside of the support table 19 (see H6. 1).
  • the nut 28 clamps a washer 28a axially against the end 220 a sleeve 22 which, in turn, is nonrotatably seated against the bearing block 21 to permit the hub 14a, which is split at 14b, to rotate about the axis of the shaft 15 as represented by the arrow A, i.e. counterclockwise in FIG. 5 when the arm assembly 1 is swung in the clockwise sense (arrow B) to afford access to the underside of the table 1 and to the interior of the base 2.
  • the slot 14b also facilitates removal of the arm 14 from the shaft 15 to permit changing of the belt adapted to pass around the sheave 12.
  • the nut 28 is removed and the bushing 22 and the lever 14 withdrawn from shaft 15.
  • a locking collar 27 anchors the shaft 15 against axial movement to the right (FIG. 2) and rests against the left-hand flank of the block 21.
  • a bolt 24 has its head 24a pivotally connected at 24b to the lever 14 at a location intermediate the fulcrum and free ends of the lever' and extends through an opening in an eye 25 whose pivot can be seen at 25 a in FIG. 1 as affixed to the bearing block 21 above the shaft 15.
  • l Between the head of the bolt 24 and the pivot 25, l provide a helical compression spring 26 under precompression to surround the bolt 24.
  • the stiffness of this spring is dimensioned such that the yielding force of the spring is smaller than the force which would overtension the belt 11.
  • To adjust the belt tension one need only use the nuts 27 provided at the threaded end of the bolt 24 emerging from the pivot eye 25.
  • the nuts 27 are backed off, whereas a tightening of the nuts on the bolt reduces the belt tension.
  • the compression of the spring 26 should be such that it yields before the tensile limit of the belt is achieved.
  • I provide a flexible coupling of the compensating type to allow swinging movement of the shaft 8 about a horizontal pivot which-is represented at C in FIG. 5, the coupling 16 forming a flexible universal joint accommodating misalignment of the end of shaft 8 and the end of motor shaft 17a when the lever 14 is swung upwardly.
  • the flexible coupling may be of the type described at pages 27-l9 ff. of Mechanical Design and Systems Handbook, Rothbart. McGraw-Hill Book Company, N.Y., 1964.
  • this coupling has a pair of coupling halves 16a and 16b respectively connected to the end of shaft 8 and to the stub of shaft 17a which projects to the right beyond the V-belt sheave 7.
  • the shaft 17a forms part of an electric motor 17 which is fixed on an arm 18, the latter being in turn clamped by a pinned collar 49 against the support block 20.
  • Arm 18 is adjustable (arrow D) about the shaft 15 and can be locked in place by the tightening of a nut 29 and the left-hand end of the shaft 15.
  • the grooves of the pulley 5 and the sheave 7 are covered over the sections about which the belt 6 is slung, with protective shields or covers 30 and 31 respectively anchored to the table 1 and to the shaft 15 and which closely fit about the respective pulleys to prevent the belt 6 from jumping from the pulley and sheave in the event of a reduction in the interaxial distance between between the motor 17 and the shaft 4.
  • motor 17 In the normal driving operation of the machine, motor 17 is driven and directly entrains its sheave 7 while the shaft 8 is driven by this motor via the flexible coupling 16. The weight of motor 17 holds the belt 6 at the desired tension. Similarly, the spring 26 biases the lever 14 in the clockwise sense (F IG. 5) and maintains tension on the belt 11 which is driven by the sheave 12 keyed to the shaft 8.
  • a sewing machine assembly comprising a support; a needle-actuating upper machine portion pivotally mounted on said support for swinging movement about a generally horizontal axis and provided with at least one drive shaft offset therefrom; a motor, a countershaft driven thereby and located below the pivotal axis of said upper portion; a belt drive interconnecting said shaft; and means enabling swinging movement of said countershaft to follow the movement of said upper portion upon the displacement thereof about its axis said electric motor being mounted on said support and including a motor shaft in axial alignment with said countershaft, said means enabling swinging movement of said countershaft including a device connecting one end of said countershaft with said motor shaft and permitting relative flexing movement of the other end of said countershaft; and means supporting said countershaft remote from said device on said support while permitting said flexing movement of the end of said countershaft whereby said belt drive remains interconnected during said movement of said upper portion.
  • said supporting means includes alever fulcrumed about an axis parallel to the axis of said motor shaftbut axially spaced therefrom and a spherical self-aligning bearing on said lever rotatably receiving said countershafi. y r
  • said belt drive includes a V-belt sheave anchored to said countershaft close to said lever, a V-belt pulley anchored to said drive shaft and a V-belt connecting said pulley with said sheave.
  • said spring means includes a bolt articulated to said lever, a pivotal eye mounted on said support and slidably receiving said bolt, and a helical compression spring surrounding said bolt and received under precompression between said support and said lever.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US834691A 1968-06-26 1969-06-19 Drive arrangement for sewing machines Expired - Lifetime US3563196A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1760743A DE1760743C3 (de) 1968-06-26 1968-06-26 Nähmaschinenantrieb

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US3563196A true US3563196A (en) 1971-02-16

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US834691A Expired - Lifetime US3563196A (en) 1968-06-26 1969-06-19 Drive arrangement for sewing machines

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DE (1) DE1760743C3 (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3695620A (en) * 1969-04-17 1972-10-03 Itsuki Ban Tape drive speed changing apparatus
US3768324A (en) * 1971-03-11 1973-10-30 Plenty & Son Ltd Automatic belt tensioning device
US3799089A (en) * 1972-05-08 1974-03-26 G Tolle Swingable hook carrier arm
US4162059A (en) * 1977-08-29 1979-07-24 Fletchall Cleo L Portable winch
US4350104A (en) * 1981-10-15 1982-09-21 The Singer Company Sewing machine motor mount
US4469036A (en) * 1982-10-04 1984-09-04 The Singer Company Electrically isolating sewing machine motor mount
US4570555A (en) * 1983-10-21 1986-02-18 Durkoppwerke Gmbh Drive device for a two-threaded chain-stitch buttonhole sewing machine
US20170067195A1 (en) * 2015-09-09 2017-03-09 Frankl & Kirchner GmbH & Co KG Fabrik für Elektromotoren u. elektrische Apparate Drive Motor Attachment Assembly for a Sewing Machine
US20170260670A1 (en) * 2016-03-08 2017-09-14 Toyota Motor Engineering & Manufacturing North America, Inc. Sewing apparatus
US20180044830A1 (en) * 2016-08-15 2018-02-15 Juki Corporation Sewing machine and sewing system
USD881951S1 (en) * 2018-01-25 2020-04-21 H.S. Machinery Co., Ltd. Motor of sewing machine
USD923459S1 (en) 2018-01-25 2021-06-29 H. S. Machinery Co., Ltd. Motor bracket of sewing machine

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3695620A (en) * 1969-04-17 1972-10-03 Itsuki Ban Tape drive speed changing apparatus
US3768324A (en) * 1971-03-11 1973-10-30 Plenty & Son Ltd Automatic belt tensioning device
US3799089A (en) * 1972-05-08 1974-03-26 G Tolle Swingable hook carrier arm
US4162059A (en) * 1977-08-29 1979-07-24 Fletchall Cleo L Portable winch
US4350104A (en) * 1981-10-15 1982-09-21 The Singer Company Sewing machine motor mount
US4469036A (en) * 1982-10-04 1984-09-04 The Singer Company Electrically isolating sewing machine motor mount
US4570555A (en) * 1983-10-21 1986-02-18 Durkoppwerke Gmbh Drive device for a two-threaded chain-stitch buttonhole sewing machine
US20170067195A1 (en) * 2015-09-09 2017-03-09 Frankl & Kirchner GmbH & Co KG Fabrik für Elektromotoren u. elektrische Apparate Drive Motor Attachment Assembly for a Sewing Machine
US20170260670A1 (en) * 2016-03-08 2017-09-14 Toyota Motor Engineering & Manufacturing North America, Inc. Sewing apparatus
US10240271B2 (en) * 2016-03-08 2019-03-26 Toyota Motor Engineering & Manufacturing North America, Inc. Sewing apparatus
US20180044830A1 (en) * 2016-08-15 2018-02-15 Juki Corporation Sewing machine and sewing system
US10626535B2 (en) * 2016-08-15 2020-04-21 Juki Corporation Sewing machine and sewing system
USD881951S1 (en) * 2018-01-25 2020-04-21 H.S. Machinery Co., Ltd. Motor of sewing machine
USD923459S1 (en) 2018-01-25 2021-06-29 H. S. Machinery Co., Ltd. Motor bracket of sewing machine

Also Published As

Publication number Publication date
DE1760743C3 (de) 1974-02-28
DE1760743A1 (de) 1972-01-20
DE1760743B2 (de) 1973-08-02

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