US3795207A - Mechanism for laterally vibrating the needle of a zigzag sewing machine - Google Patents

Mechanism for laterally vibrating the needle of a zigzag sewing machine Download PDF

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US3795207A
US3795207A US00333259A US3795207DA US3795207A US 3795207 A US3795207 A US 3795207A US 00333259 A US00333259 A US 00333259A US 3795207D A US3795207D A US 3795207DA US 3795207 A US3795207 A US 3795207A
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needle bar
bar gate
arm
sewing machine
lever arm
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G Tolle
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B3/00—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing
    • D05B3/02—Sewing apparatus or machines with mechanism for lateral movement of the needle or the work or both for making ornamental pattern seams, for sewing buttonholes, for reinforcing openings, or for fastening articles, e.g. buttons, by sewing with mechanisms for needle-bar movement
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B57/00—Loop takers, e.g. loopers
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2501/00—Wearing apparel
    • D10B2501/06—Details of garments
    • D10B2501/062—Buttonholes

Definitions

  • ABSTRACT A mechanism for positively jogging a needle bar gate laterally from a rotary actuator within the constricted space of a sewing machine frame.
  • An arm extending from the needle bar gate and an arm of a lever in the machine frame which is rocked by the rotary actuator are interconnected and both arms are flexible only in one common plane to accommodate differences in the arcuate paths of motion thereof, the arms being otherwise rigid to transmit lateral jogging motion in a positive manner to the needle bar gate.
  • the present invention provides a mechanism for positively jogging a needle bar gate in both directions .utilizing only a minimum amount of space within the sewing machine frame. Because the parts of the mechanlsm are compactly arranged and positively interconnected, deflections and tolerance accumulations are minimized and an accurate high speed needle jogging mechanism results; A'- problem arises with the compact arrangement of positively interconnected parts in that differences in the arcuate paths of motion of the various interconnected parts must be reconciled.
  • FIG. 1 represents a side elevational view partly in vertical cross-section of'a sewing machine having this invention applied thereto, 2
  • FIG. 2 is a disassembled perspective view of the needle bar vibrating mechanism of this invention
  • FIG. 3 is a cross-sectional view taken substantially along line 3-3 of FIG. 1 showing the assembled needle bar vibrating mechanism of this invention
  • FIG.'4 is a cross-sectional'view taken substantially along line 4-4 of FIG. 1 showing the assembled needle bar vibrating mechanism of this invention.
  • FIG. 5 is a perspective view of the assembled flexible arms of the mechanism of this invention.
  • FIG. 1 illustrates a sewing machine to which the needle jogging mechanism of this invention may be applied.
  • the sewing machine illustrated in FIG. 1 is a buttonhole sewing machine including a stationary frame portion 11 in which a needle carrying bar 12 is sup-
  • the needle bar 12 is endwise reciprocable in a needle bar gate 20 which is formed with conical sockets 21 engageable by trunnion pins 22 secured in the stationary frame portion 11.
  • the trunnion pins define a pivotal axis A-A about which the needle bar gate can swing to impart lateral vibratory movement to the needle bar for forming zigzag stitches which are necessary to produce a buttonhole.
  • the needle bar is reciprocated endwise in the needle bar gate by means of a lateral stud extending from the needle bar and embraced by a drive link 31 which also embraces a crank pin 32 secured on a main shaft 33 in the stationary frame portion 11.
  • the drive link 31 may be bifurcated as at 34 to embrace a stabilizing bracket 35 to prevent interference between the swinging movement of the needle bar gate and the endwise reciprocatory movements imparted to the needle bar by the drive link 31.
  • a sprocket on the main shaft meshes with a timing belt 41 which extends into driving relation with a sprocket 42 carried on a countershaft 43 journaled in "the stationary frame portion 11. It is a crank'44 on the countershaft' 43 which in partaking of rotary movement gives rise to the lateral jogging motion-imparted to the needle bar gate.
  • the 'co -pending application Ser. No; 333,257 filed Feb. I6, 1973 which is incorporated herein by reference may be referredto for a detailed description of a mechanism for varying the positionand amplitude of movement of the crank 1 that the mechanism of this invention for transmitting lateral. jogging movements to the needle'bar is adapted to the compact space requirements of a buttonhole sewing machine with high speed operating characteristics.
  • the needle bar gate 20 is formed with a projection carrying a pivot pin 51 on which a bracket 52 is journaledu
  • the angular relation of the bracket 52 to the needle bar gate 20 is influenced by a headed screw 53 which passes through a clearance aperture 54 in the bracket and is threaded into the needle bar gate, and a set screw 55 threaded in the bracket
  • the freeextremity of the leaf spring 57 is embraced by a conical split block 58 on which a spherical ball 59 ofa universal connection 60 is'forced by a nut 61 which engages threads 62 formed on the split block.
  • a lever arm 73 Secured as by a rivet to a flange 71 extending from a spherical socket 72 which embraces the spherical ball 59 and forms partof the universal connection 60, is a lever arm 73 preferably provided by a flat leaf spring.
  • the lever arm 73 forms one arm of a bell crank lever indicated generally as 74. Secured to each side of the lever arm 73 is an apertured spacer block 75 and a rigid lever arm 76. Each of the lever arms 76 is formed with a fulcrum aperture 77 and also formed with a substantially radial slot 78. A bushing 79 arranged in the fulcrum aperture 77 accommodates a fulcrum pin 80 threaded into a boss 81 of the stationary frame portion 11. Rivets 82 serve to sustain the lever arms 76 and spacer block 75 in assembled relation with respect to the lever arm 73.
  • a drive link 90 embracing the crank pin 44 also embraces a headed pivot pin 91 which may be secured in selected positions along the radial slots 78 of the rigid lever arms 76 by a clamp nut 92 threaded on the pivot pin 91 preferably with a washer-sleeve 93 interposed between the pivot pin 91 and each of the lever arms 76.
  • a headed pivot pin 91 By adjustment of the pivot pin 91 along the slots 78 the amplitude of zigzag movements derived from the crank pin 44 may be changed.
  • the position of the needlebar gate may be adjusted about the pivotal axis A-A to effect a positional adjustment of the needle bar gate without influence upon the amplitude of zigzag movement.
  • the flat leaf spring 57 forms a part of an arm projecting from the needle bar gate in a plane substantially perpendicular to the pivotal axis A-A of the needle bar gate.
  • the lever arm'73 must be capable of movement laterally inorder to accommodate the arcuate path 8-8 of the arm 57. Such accommodation is provided by theflexibility of the lever arm 73 resulting from the construction of the lever arm 73 v as a leaf spring.
  • the lever arm 73 since it turns about the fulcrum pin 80 providing a fulcrum axis C-C for the bell crank lever 74, will move in an arcuate path indicated as D-D.
  • the arm 57 mustbe capable of movement out of its usual plane in order to accommodate this arcuate path D-D of the lever arm 73.
  • Such accommodation is provided as a result of the construction of the arm 57 as a leaf spring, As shown in FIG. 5, the arm S7'and the lever arm 73 are each formed of flat leaf spring material arranged substantially perpendicular to each other so as each to be flexible only in a common plane X-X.
  • the arm 57 and the lever arm 73 will be rigid'and, therefore, able to transmit forces in a positive manner.
  • the plane X-X is parallel to both the pivotal axis A-A of the needle bar gate and to the fulcrum axis C-C of the bell crank lever 74.
  • the motion derived from the crank pin 44 may be transmitted into positive lateral jogging movements of the needle bar gate in each direction. Because of the flexibility of the arms 57 and 73 in the common plane X-X, the angular paths of motion of the interconnected elements of the mechanism for transmitting the needle jogging motion can be accommodated.
  • a sewing machine having a needle carrying bar endwise reciprocable in a gate pivotally supported on an axis fixed in the sewing machine frame, and a rotary actuator journaled in said frame for vibrating said needle bar gate laterally, mechanism operated by said rotary actuator for shifting said needle bar gate positively in each direction of lateral vibration characterized by an arm projecting from said needle bar gate, a lever arm pivotally supported on a fulcrum axis fixed in said sewing machine frame, said lever arm being articulated by a universal connection to said needle bar gate arm, means in said needle bar gate arm and in said lever arm 'providing'for flexibility of each of said arms only in a common plane which is substantially parallel to the pivotal axis of said needle bar gate and to the fulcrum axis of said lever arm, and a drive link operatively connecting said rotary actuator with said lever arms 2.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)

Abstract

A mechanism for positively jogging a needle bar gate laterally from a rotary actuator within the constricted space of a sewing machine frame. An arm extending from the needle bar gate and an arm of a lever in the machine frame which is rocked by the rotary actuator are interconnected and both arms are flexible only in one common plane to accommodate differences in the arcuate paths of motion thereof, the arms being otherwise rigid to transmit lateral jogging motion in a positive manner to the needle bar gate.

Description

United States Patent 1191 A Tolle 1 1 Mar. 5, 1974 1 1 MECHANISM FOR LATERALLY VlBRATlNG THE NEEDLE OF A ZIGZAG SEWING MACHINE [76] Inventor: Gunter Tolle, 752 Bruchal 4/ Wendclinusstr. l5, Bruchsal, Germany -22 Filed: Feb. 16, 1973 2| 1 Appl. N6; 333,259
'[30] Foreign Application Priority Data May 6, 1972 Germany 2222370 52 us. c1 112/158 R 51 I Int. Cl D05b 3/02 [58] Field o Search.. .l l2/65, 66, 73, 158 R, 158 B, 112/158 c [56] References Cited UNITED STATES PATENTS 2,618,231 11/1952 Turner 112/158 R X 4/1959 Amman 112/158 X 10/1962 Hirk. 112/1511 X Primary E aminerWerner HQ Schroeder Attorney, Agent, or FirmMarshall .1. Breen; Chester A. Williams, Jr.; Robert Smith [57] ABSTRACT A mechanism for positively jogging a needle bar gate laterally from a rotary actuator within the constricted space of a sewing machine frame. An arm extending from the needle bar gate and an arm of a lever in the machine frame which is rocked by the rotary actuator are interconnected and both arms are flexible only in one common plane to accommodate differences in the arcuate paths of motion thereof, the arms being otherwise rigid to transmit lateral jogging motion in a positive manner to the needle bar gate.
2 Claims, 5 Drawing Figures PAIENTED 51974 SHEEI 1 0F 2 1 MECHANISM FOR LATERALLY VIBRATING THE NEEDLE OF A ZIGZAG SEWING MACHINE BACKGROUND OF THE INVENTION The problem of imparting lateral jogging motion to a needle bar gate in a sewing machine is facilitated when ample space is provided because differences in arcuate paths of motion as between interconnected parts may then be minimized. Solution to problem is also facilitated in sewing machines driven at moderate or slow speeds wherein the needle bar gate may be positively driven in only one direction and spring biased in the other direction.
The present invention provides a mechanism for positively jogging a needle bar gate in both directions .utilizing only a minimum amount of space within the sewing machine frame. Because the parts of the mechanlsm are compactly arranged and positively interconnected, deflections and tolerance accumulations are minimized and an accurate high speed needle jogging mechanism results; A'- problem arises with the compact arrangement of positively interconnected parts in that differences in the arcuate paths of motion of the various interconnected parts must be reconciled.
- 'BRIEFSUMMARY .OF THE INVENTION DEVSCRIFTION OF THE, DRAWINGS With the above and other objectsand advantages in view this invention is illustrated in a preferred embodiment in the accompanying drawings in which:
FIG. 1 represents a side elevational view partly in vertical cross-section of'a sewing machine having this invention applied thereto, 2
FIG. 2 is a disassembled perspective view of the needle bar vibrating mechanism of this invention FIG. 3 is a cross-sectional view taken substantially along line 3-3 of FIG. 1 showing the assembled needle bar vibrating mechanism of this invention,
FIG.'4 is a cross-sectional'view taken substantially along line 4-4 of FIG. 1 showing the assembled needle bar vibrating mechanism of this invention, and
FIG. 5 is a perspective view of the assembled flexible arms of the mechanism of this invention.
FIG. 1 illustrates a sewing machine to which the needle jogging mechanism of this invention may be applied. The sewing machine illustrated in FIG. 1 is a buttonhole sewing machine including a stationary frame portion 11 in which a needle carrying bar 12 is sup- The needle bar 12 is endwise reciprocable in a needle bar gate 20 which is formed with conical sockets 21 engageable by trunnion pins 22 secured in the stationary frame portion 11. The trunnion pins define a pivotal axis A-A about which the needle bar gate can swing to impart lateral vibratory movement to the needle bar for forming zigzag stitches which are necessary to produce a buttonhole.
The needle bar is reciprocated endwise in the needle bar gate by means of a lateral stud extending from the needle bar and embraced by a drive link 31 which also embraces a crank pin 32 secured on a main shaft 33 in the stationary frame portion 11. The drive link 31 may be bifurcated as at 34 to embrace a stabilizing bracket 35 to prevent interference between the swinging movement of the needle bar gate and the endwise reciprocatory movements imparted to the needle bar by the drive link 31.
For deriving the lateral jogging movements of the needle bar, a sprocket on the main shaft meshes with a timing belt 41 which extends into driving relation with a sprocket 42 carried on a countershaft 43 journaled in "the stationary frame portion 11. It is a crank'44 on the countershaft' 43 which in partaking of rotary movement gives rise to the lateral jogging motion-imparted to the needle bar gate. The 'co -pending application Ser. No; 333,257 filed Feb. I6, 1973 which is incorporated herein by reference may be referredto for a detailed description of a mechanism for varying the positionand amplitude of movement of the crank 1 that the mechanism of this invention for transmitting lateral. jogging movements to the needle'bar is adapted to the compact space requirements of a buttonhole sewing machine with high speed operating characteristics.
Referring to FIGS. 2 and 3, the needle bar gate 20 is formed with a projection carrying a pivot pin 51 on which a bracket 52 is journaleduThe angular relation of the bracket 52 to the needle bar gate 20 is influenced by a headed screw 53 which passes through a clearance aperture 54 in the bracket and is threaded into the needle bar gate, and a set screw 55 threaded in the bracket The freeextremity of the leaf spring 57 is embraced bya conical split block 58 on which a spherical ball 59 ofa universal connection 60 is'forced by a nut 61 which engages threads 62 formed on the split block.
Secured as by a rivet to a flange 71 extending from a spherical socket 72 which embraces the spherical ball 59 and forms partof the universal connection 60, is a lever arm 73 preferably provided by a flat leaf spring.
The lever arm 73 forms one arm of a bell crank lever indicated generally as 74. Secured to each side of the lever arm 73 is an apertured spacer block 75 and a rigid lever arm 76. Each of the lever arms 76 is formed with a fulcrum aperture 77 and also formed with a substantially radial slot 78. A bushing 79 arranged in the fulcrum aperture 77 accommodates a fulcrum pin 80 threaded into a boss 81 of the stationary frame portion 11. Rivets 82 serve to sustain the lever arms 76 and spacer block 75 in assembled relation with respect to the lever arm 73.
A drive link 90 embracing the crank pin 44 also embraces a headed pivot pin 91 which may be secured in selected positions along the radial slots 78 of the rigid lever arms 76 by a clamp nut 92 threaded on the pivot pin 91 preferably with a washer-sleeve 93 interposed between the pivot pin 91 and each of the lever arms 76. By adjustment of the pivot pin 91 along the slots 78 the amplitude of zigzag movements derived from the crank pin 44 may be changed. By adjustment of the headed screw 53 and the set screw 55, the position of the needlebar gate may be adjusted about the pivotal axis A-A to effect a positional adjustment of the needle bar gate without influence upon the amplitude of zigzag movement.
As indicated in FIGS. 1 and 2, the flat leaf spring 57 forms a part of an arm projecting from the needle bar gate in a plane substantially perpendicular to the pivotal axis A-A of the needle bar gate. The extremity of the flat leaf spring 57 to which the universal connection 60 is secured, therefore, will move in'an'arcuate path indicated at 8-8 in FIG. 3. The lever arm'73 must be capable of movement laterally inorder to accommodate the arcuate path 8-8 of the arm 57. Such accommodation is provided by theflexibility of the lever arm 73 resulting from the construction of the lever arm 73 v as a leaf spring.
As indicated in FIG. 4, the lever arm 73 since it turns about the fulcrum pin 80 providing a fulcrum axis C-C for the bell crank lever 74, will move in an arcuate path indicated as D-D. The arm 57 mustbe capable of movement out of its usual plane in order to accommodate this arcuate path D-D of the lever arm 73. Such accommodation is provided as a result of the construction of the arm 57 as a leaf spring, As shown in FIG. 5, the arm S7'and the lever arm 73 are each formed of flat leaf spring material arranged substantially perpendicular to each other so as each to be flexible only in a common plane X-X. [n all other directions the arm 57 and the lever arm 73 will be rigid'and, therefore, able to transmit forces in a positive manner. As shown in FIG. 3, the plane X-X is parallel to both the pivotal axis A-A of the needle bar gate and to the fulcrum axis C-C of the bell crank lever 74. By this arrangement the motion derived from the crank pin 44 may be transmitted into positive lateral jogging movements of the needle bar gate in each direction. Because of the flexibility of the arms 57 and 73 in the common plane X-X, the angular paths of motion of the interconnected elements of the mechanism for transmitting the needle jogging motion can be accommodated.
The accommodation of different paths of motion of the interconnected elements of the needle jogging mechanism is accomplished in so satisfactory a manner by this invention that extremely small radii of the arms 57 and 73 with consequent large angular movements thereof may be tolerated successfully with the result that the mechanism of this invention may be accommodated in very compact space. Extremely narrow buttonhole machines which permit closer spacing so that adjacent buttonholes may be simultaneously stitched close together may be made using this invention.
Having set forth the nature of this invention, what is claimed herein is: v
1. A sewing machine having a needle carrying bar endwise reciprocable in a gate pivotally supported on an axis fixed in the sewing machine frame, and a rotary actuator journaled in said frame for vibrating said needle bar gate laterally, mechanism operated by said rotary actuator for shifting said needle bar gate positively in each direction of lateral vibration characterized by an arm projecting from said needle bar gate, a lever arm pivotally supported on a fulcrum axis fixed in said sewing machine frame, said lever arm being articulated by a universal connection to said needle bar gate arm, means in said needle bar gate arm and in said lever arm 'providing'for flexibility of each of said arms only in a common plane which is substantially parallel to the pivotal axis of said needle bar gate and to the fulcrum axis of said lever arm, and a drive link operatively connecting said rotary actuator with said lever arms 2. A sewing machine as set forth in claim 1 characterized in thatthe means in both said needle bar gate arm and said lever arm for providing flexibility only in a common plane comprises flat leaf springs forming at least a part of each of said arms, saidflat leaf springs being arranged in substantially mutually perpendicular relationship. 7

Claims (2)

1. A sewing machine having a needle carrying bar endwise reciprocable in a gate pivotally supported on an axis fixed in the sewing machine frame, and a rotary actuator journaled in said frame for vibrating said needle bar gate laterally, mechanism operated by said rotary actuator for shifting said needle bar gate positively in each direction of lateral vibration characterized by an arm projecting from said needle bar gate, a lever arm pivotally supported on a fulcrum axis fixed in said sewing machine frame, said lever arm being articulated by a universal connection to said needle bar gate arm, means in said needle bar gate arm and in said lever arm providing for flexibility of each of said arms only in a common plane which is substantially parallel to the pivotal axis of said needle bar gate and to the fulcrum axis of said lever arm, and a drive link operatively connecting said rotary actuator with said lever arm.
2. A sewing machine as set forth in claim 1 characterized in that the means in both said needle bar gate arm and said lever arm for providing flexibility only in A common plane comprises flat leaf springs forming at least a part of each of said arms, said flat leaf springs being arranged in substantially mutually perpendicular relationship.
US00333259A 1972-05-06 1973-02-16 Mechanism for laterally vibrating the needle of a zigzag sewing machine Expired - Lifetime US3795207A (en)

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DE2222370A DE2222370C3 (en) 1972-05-06 1972-05-06 Zigzag sewing machine

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JP (1) JPS571273B2 (en)
DE (1) DE2222370C3 (en)
FR (1) FR2184277A5 (en)
GB (1) GB1426761A (en)
IT (1) IT979622B (en)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2618231A (en) * 1950-05-05 1952-11-18 Singer Mfg Co Control means for sewing machines
US2883951A (en) * 1954-03-30 1959-04-28 Flii Borletti D P A Device for actuating the needle bar of zig-zag sewing machines
US3057310A (en) * 1960-03-01 1962-10-09 William F Hirk Monogramming and embroidering machines

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2618231A (en) * 1950-05-05 1952-11-18 Singer Mfg Co Control means for sewing machines
US2883951A (en) * 1954-03-30 1959-04-28 Flii Borletti D P A Device for actuating the needle bar of zig-zag sewing machines
US3057310A (en) * 1960-03-01 1962-10-09 William F Hirk Monogramming and embroidering machines

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DE2222370A1 (en) 1973-11-08
JPS4922234A (en) 1974-02-27
FR2184277A5 (en) 1973-12-21
JPS571273B2 (en) 1982-01-09
DE2222370B2 (en) 1974-04-25
GB1426761A (en) 1976-03-03
IT979622B (en) 1974-09-30
DE2222370C3 (en) 1975-01-02

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