US2033671A - Feeding mechanism for sewing machines - Google Patents

Feeding mechanism for sewing machines Download PDF

Info

Publication number
US2033671A
US2033671A US731379A US73137934A US2033671A US 2033671 A US2033671 A US 2033671A US 731379 A US731379 A US 731379A US 73137934 A US73137934 A US 73137934A US 2033671 A US2033671 A US 2033671A
Authority
US
United States
Prior art keywords
crank
roller
connecting rod
arm
rollers
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
US731379A
Other languages
English (en)
Inventor
Bach Louis
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of US2033671A publication Critical patent/US2033671A/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
    • D05B27/10—Work-feeding means with rotary circular feed members
    • D05B27/18—Feed cups

Definitions

  • My invention relates to improvements in feedfeeding rollers.
  • the object of the improvements is to provide a feeding mechanism which is simple in construction and reliable in operation, and with this object in View my invention consists in providing a mechanism for rotating the rollers, in whichin addition to the main crank pins a third or subsidiary crank pin is provided, which is out of alignment with the main crank pins, the connecting rod taking the form of a bell crank lever, or. of a'triangle.
  • Fig. 1 is a sectional elevation showing the Work feeding mechanism
  • Fig. 2 isa plan view of portions of Fig. 1, with parts in section,
  • Figs. 3 and 4 are respectively a plan view and an"elevation showing a part of the mechanism
  • Figs. 5 and 6 are diagrams showing the crank mechanism and illustrating the operation thereof.
  • Fig. 7 is a diagrammatic view similar to Fig. 5 showing a modified form of crank mechanism.
  • the work feeding mechanism comprises a pair of feeding rollers I and 2 which are adapted to be intermittently rotated through the intermediary of a vertical shaft 3 carrying the feeding roller I and a spur gear 4, the said spur gear being operatively connected with the main driving shaft of the machine by mechanism imparting intermittent rotary movement thereto.
  • the spur gear 4 is in mesh with a spur gear 5 fixed to a shaft 6, and the shafts 3 and 6 are mounted in suitable bearings provided on the frame 'I of the machine.
  • the shaft 6 projects upwardly Vbeyond the said frame, and it is formed with a reduced top part 8 providing a pivot on which an arm 9 is mounted, the said arm being located between a shoulder 8 formed on the shaft 6 and a crank disk I0 fixed to the reduced portion 8 of the shaft B.
  • the arm 9 is angular or curved in shape, and at its free end it is formed with' an eye I2 providing a bearing for a vertical shaft I3.
  • a crank disk I4 is secured which is located above the eye I2, and the disks I0 and I4 carry crank.
  • crank pins I5 and I6 which are connected by a connecting rod I8, I9. If the said crank pins were connected by an ordinary connecting rod, such as is indicated in Fig. 2 by a straight dotted line I'I, and if the crank pins I5 and I6 were on ⁇ dead centres, regular transmission of rotary movement from the crank pin I5 to the crank pin I 5 would not be possible.
  • the connecting rod is connected with a subsidiary crank pin 2I which is out of alignment with the crank pins I5 and I6, and accordingly the connecting rod is not straight, as is indicated by the dotted line I'I, but curved or angular, and it consists of two branches I8 and I9, the subsidiary crank pin 2
  • both the arm ⁇ 9 and the connecting rod not only provides for the proper operation of the connecting rod with-- out the difficulty of dead center but producesV a second very beneficial result.
  • the connecting rod and the arm 9 are thus curved away from above the feed rollers 2 and 1 so that a clear view can be had at all times of the work being. sewed.
  • the height of the connecting rod and the arm 9 above the feed rollers can be adjusted as required, nevertheless it is of great advantage to have the rod curved away from the tops of the rollers so that there is a clear line of unobstructed vision directly to the point of stitching.
  • is fixed to a crank disk 22 the pivot bolt 23 of which is loosely mounted in a bore of the arm 9. It will be understood that the said crank pin is not directly needed for transmitting movement from the shaft 6 to the roller 2, but it is important in so far as it enables the driven crank pin IB to pass through its dead centre, as will be explained hereinafter.
  • a spu ⁇ gear 25 is secured which is in mesh with a spur gear 26 secured to a shaft 21 carrying the feeding roller 2.
  • the spur gears 25 and 26 and their shafts are mounted and confined in a housing 28 which is formed with an upwardly directed sleeve 29 through which the shaft I3 is passed, the said sleeve being formed with a reduced top part 30 engaging in a corresponding socket made in the eye I2, the sleeve 29 being fixed to the eye I2 by means of a clamping screw 3I.
  • the housing 28 is formed with a sleeve 32 which provides a bearing for the shaft 2'I of the feeding roller 2, and the spur gearing 26. Therefore the roller 2 is connected with the machine only through the arm 9.
  • the arm 9 is adapted to be rocked about the reduced end 8 of the vertical shaft 6 to which the crank disk I9 is fixed.
  • the arm 9 is acted upon by a spring 35 so that the rollers I and 2 engage each other with a certain pressure.
  • the said spring is embedded in a sleeve 36 secured to the frame of the machine, a screw 31 being provided for regulating the tension of the spring. With its free end the spring 35 bears on a shoulder 38 provided on the arm 9 so that the pressure of the roller 2 on the roller I depends on the tension of the spring 35.
  • roller 2 is rocked away from and towards the roller I by moving in a plane, and, preferably, in a horizontal plane. Thereby the stitch forming devices are not interfered with.
  • an arm 4i] is secured, which is formed at its free end with a head 4I for the needle, a slot 42 being made in the said head for the passage of the needle.
  • the feeding rollers I and 2 are perfectly smooth and plane on their top faces, and therefore it is not necessary to provide marginal slots in the rollers for the passage of the needle.
  • the branches I8 and I9 of the connecting rod are rigidly connected with each other.
  • said connecting rod preferably may be angular in form, as is shown in Figs. 2, 5 and 6, or, it may take the form of a triangle as is indicated in Fig. '7 by the line 45 representing a solid rod.
  • the connecting rod is pivotally mounted on three crank pins I5, I 6 and 2
  • crank pins In Figs. 5 and 6 I have shown the said crank pins, the cranks I 0, I4 and 22 and their axes 8, I3 and 23. In Fig. 5 the said parts are shown in the positions in which the cranks I0 and I4 pass through their dead centres. If the crank I0 is the driving member, and if the third crank mechanism 2I, 22, 23 were not provided, the said driving member would not be able to move the opposite end of the connecting rod through the dead centre of the crank I4. However, by transmitting the movement through the curved or angular rod I8, I9 and the intermediate crank 22, the solid branch I8 of the connecting rod causes corresponding movement of the crank 22 when the crank I5 is rotated in clockwise direction, as is indicated in Fig.
  • crank 22 is not in its dead centre relatively to the crank III, and therefore the intermediate crank 22 carries along the crank I4 by means of the branch I9 of the connecting rod, which branch is rigidly connected with the branch I8. Therefore the operation is the same as if all the crank pins I5, I6 and 2
  • Fig. 6 I have shown the parts in the positions in which the cranks I4 and 22 are relatively to each other in their dead centres. It will again be understood that the movement is not interfered with by the said cranks being in their dead centres, because with the crank I0 rotating in clockwise direction the other cranks are carried along by reason of the solid angular rod I8, I9.
  • the driving mechanism of the machine is made simple in construction, by jointing the connecting rod to three cranks located out of alignment with one another. Further, the operation of the machine is simple, because the transmitting devices may be provided at one part only of the machine where they do not interfere with sewing.
  • the outer feeding roller 2 By mounting the outer feeding roller 2 so that the said feeding roller and the mounting thereof may be rocked away from the roller I a cardan joint may be dispensed with.
  • the rockable arm 9 and the connecting rod carried thereby may be disposed at any suitable height, so that the said parts do not hinder the attendant guiding the fabric or attending to other work. Further, the parts may have any desired shape. As appears from Fig.
  • the intermediate crank 2I may be located any suitable distance away from the line I'I, and accordingly the arm 9 and the connecting rod I8, I9 may extend laterally as far as is desired for providing free room at the stitch forming part of the machine.
  • the mechanism for driving the outer roller 2 at a, definite height or above the said roller, and the said power transmitting mechanism may also be disposed below the plane of the rollers I and 2 and at any desired depth.
  • a driving mechanism for sewing machines the combination, with a pair of feeding rollers, of a driving shaft in driving engagement with one of said rollers, an arm rockingly mounted on said driving shaft and having the other roller mounted thereon, a spring acting on said arm for pressing the roller mounted thereon into engagement with the first-named roller, and crank mechanism connecting said driving shaft and the roller mounted on said arm.
  • crank mechanism comprises a connecting rod and three cranks engaging the said connecting rod and located out of alignment with one another.
  • a driving mechanism for sewing machines the combination, with the feeding rollers, of a driving shaft intermittently rotated in one direction connected with one of said rollers, and mechanism connecting the driving shaft with the other roller, said mechanism including three cranks having their axes parallel, the axis of one crank being located laterally with respect to the plane containing the other two axes, and a single link in the general shape of a bell crank lever connecting said cranks.
  • a housing depending from said arm a bearing for the roller carried by said housing and gearing connecting said roller and said crank mechanism and being mounted in said housing.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US731379A 1933-03-04 1934-06-19 Feeding mechanism for sewing machines Expired - Lifetime US2033671A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEL83286D DE608515C (de) 1933-03-04 1933-03-04 UEberwendlichnaehmaschine mit zwangslaeufig angetriebenen Vorschubkesseln

Publications (1)

Publication Number Publication Date
US2033671A true US2033671A (en) 1936-03-10

Family

ID=7981872

Family Applications (1)

Application Number Title Priority Date Filing Date
US731379A Expired - Lifetime US2033671A (en) 1933-03-04 1934-06-19 Feeding mechanism for sewing machines

Country Status (3)

Country Link
US (1) US2033671A (fr)
DE (1) DE608515C (fr)
FR (1) FR773790A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114381871A (zh) * 2021-12-27 2022-04-22 际华三五零六纺织服装有限公司 一种平缝机脉动式可纠偏送布装置

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114381871A (zh) * 2021-12-27 2022-04-22 际华三五零六纺织服装有限公司 一种平缝机脉动式可纠偏送布装置

Also Published As

Publication number Publication date
FR773790A (fr) 1934-11-26
DE608515C (de) 1936-05-05

Similar Documents

Publication Publication Date Title
US2033671A (en) Feeding mechanism for sewing machines
US2643625A (en) Work feeding mechanism for sewing machines
US1715119A (en) Sewing machine
US2410240A (en) Feeding mechanism for quilting machines and the like
GB533958A (en) Overedge sewing machine
US2014916A (en) Needle-vibration controlling mechanism for zigzag-stitch sewing machines
US2102202A (en) Differential feed device for sewing machines
US1191232A (en) Sewing-machine.
US2045340A (en) Zigzag stitching machine
US2043749A (en) Feeding mechanism for sewing machines
US2398652A (en) Sewing machine
US2049292A (en) Duplex feeding mechanism for sewing machines
US2133229A (en) Sewing machine
GB867725A (en) Improvements relating to stitch adjusting devices for sewing machines
US1878146A (en) Sewing machine
US865149A (en) Sewing-machine.
US2028016A (en) Sewing machine
US3020865A (en) Sewing machine for producing variable stitches
US1348176A (en) Glove-sewing machine
USRE22094E (en) Sewing machine
US2720854A (en) Sewing machine thread ratio control
US2759442A (en) Sewing machines
US2111394A (en) Sewing machine
US935847A (en) Sewing-machine.
US3242890A (en) Sewing machine for sewing decorative stitches