US3699910A - Cam selector mechanisms for sewing machines - Google Patents

Cam selector mechanisms for sewing machines Download PDF

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Publication number
US3699910A
US3699910A US171935A US3699910DA US3699910A US 3699910 A US3699910 A US 3699910A US 171935 A US171935 A US 171935A US 3699910D A US3699910D A US 3699910DA US 3699910 A US3699910 A US 3699910A
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United States
Prior art keywords
cam
pattern
stack
control
control block
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
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US171935A
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English (en)
Inventor
John A Urciola
Walter H W Marsh
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Singer Co
Original Assignee
Singer Co
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Filing date
Publication date
Application filed by Singer Co filed Critical Singer Co
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Publication of US3699910A publication Critical patent/US3699910A/en
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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B19/00—Program-controlled sewing machines

Definitions

  • ABSTRACT A cam selecting machine for a zigzag sewing machine needle jogging mechanism in which a single control block is formed with not only camming means for shifting a cam follower relatively to a cam stack, but also with camming means correlated therewith for removing the cam follower out of tracking relation with the cam stack during each cam selecting manipulation.
  • the objects of this invention are attained by the provision of an integral control block shiftably supported relatively to a cam follower and formed not only with cam surfaces for influencing the relative position of the cam follower along the stack of cams, but also formed with cam surfaces for removing the follower from the cam stack during each selecting motion.
  • FIG. 1 represents a top plan view of a sewing machine in which the top cover plate has been removed to expose the mechanism with this invention applied thereto,
  • FIG. 2 is a front elevational view of the sewing machine of FIG. 1, and
  • FIG. 3 is an exploded perspective view of the needle jogging mechanism and the cam selecting mechanism of this invention.
  • This invention is illustrated in the accompanying drawings as applied to a conventional sewing machine having a bed 11 from which rises a standard 12 supporting a bracket arm 13 overhanging the bed.
  • a main shaft 14 is journalled in the sewing machine bracket arm and carries a balance wheel pulley 15 which is driven by a belt 16 from an electric motor 17 which may be supported on the sewing machine standard 12.
  • a crank mechanism 18 on the main shaft 14 is operatively connected to impart endwise reciprocatory movements to a needle carrying bar 19 and to impart oscillatory movement to a needle thread take-up 20.
  • the needle carrying bar 19 is journalled for endwise reciprocatory movement in a gate 25 which is pivotally supported in the sewing machine bracket arm on a stud 26. Secured by a set screw 28 in the gate is a connecting pin 27 by which a bracket 29 is pivoted to the needle bar gate.
  • a needle jogging drive link 30 is secured to the bracket 29 by a fastening screw 31.
  • a rounded nose 32 formed on the drive link 30 is maintained by a spring 33 against a radial shoulder 34 which is formed on an oscillating lever 35.
  • the lever 35 is pivoted on a shoulder screw 36 to a needle positioning bracket 37 supported for turning movement on a pivot pin 38 secured in the sewing machine bracket arm.
  • a bell crank lever 40 with a handle 41 projecting exteriorly of the frame is fulcrummed on a shoulder screw 42 in the machine frame.
  • the lever 40 carries a pin 43 passing through a slot 44 in the drive link 30 by which the rounded nose 32 on the drive link will be shifted along the radial shoulder 34 of the oscillating lever 35 to vary the width of zigzag stitching in proportion to the distance of the nose 32 from the screw 36 on which the oscillating lever is pivoted.
  • An eccentric pin 45 is threaded in the needle positioning bracket 37 and secured in selected position therein by a lock nut 46 passing through a slot 47 in a needle position adjusting lever 48.
  • the lever 48 is fulcrummed on a stud 49 in the bracket arm 13 and is formed with a handle 50 projecting exteriorly of the machine frame.
  • the neutral position of needle vibration may be regulated to occur to the left, right or center of the field of zigzag stitching.
  • These positions of adjustment may be defined by a detent plunger shiftably supported in the bracket arm and urged by a spring 151 into a respective one of the locating notches 152 formed beneath the lever 48.
  • cam follower lever arm 59 is formed with a hub portion 60 (FIG. 3) which is slidably pivoted on the stud 49.
  • the cam follower lever arm is formed with a cam follower finger 61 adapted to track the periphery of any selected one of the pattern cams 52, 53 or 54.
  • the cam follower lever arm is formed with an abutment finger 62 which occupies a position in engagement with a vertical elongate rib 63 formed on the oscillating lever 35.
  • the above described pattern cam influenced needle jogging mechanism is typical of a conventional arrangement well-known in the art of zigzag sewing. This mechanism is well adapted to accommodate the pattern cam selecting mechanism of this invention although other known types of needle jogging mechanisms may also accommodate the present cam selecting arrangement advantageously.
  • the stud 49 is formed at the top with a threaded axial hole 65 to accommodate a shoulder pivot screw 66 by which a throw-out lever 67 for the cam follower lever arm is fulcrummed.
  • One arm 68 of the throw-out lever 67 is formed with a finger 69 adapted to abut the vertical rib 63 of the oscillating lever 35.
  • the other arm 70 of the throw-out lever 67 carries a follower pin 71 which may take the form of an eccentric pin threaded into the lever arm 70 and locked thereon by a lock unit 72.
  • a light coil spring 73 is arranged between the throw-out lever 67 and the cam follower lever arm 59.
  • the coil spring 73 encircles the stud 49 and engages the throw-out lever 67 with one extremity and the cam follower lever arm 59 with the other extremity.
  • the coil spring 73 provides not only a light downward bias on the cam follower lever arm 59 tending to slide the lever'arm 59 downwardly along the stud 49; but also provides a light turning movement urging the cam follower lever arm 59 away from the periphery of the pattern cams 52, 53 and 54.
  • the force exerted by the spring 73 tending to turn the cam follower lever arm away from the cam stack is preferably only a small fraction of the force exerted by the spring 33 urging the needle jogging linkage toward the pattern cams.
  • this invention provides for selection of any one of the pattern cams 52, 53 or 54 to be tracked by the finger 61 of the cam follower lever arm 59 by a simple mechanism employing an integral control block 80.
  • the control block is formed with an elongate slot 81 adapted to embrace the stud 49 so that the control block is slidably pivoted on the stud 49.
  • An in temal lip 82 bordering the slot 81 is constrained in an annular groove 84 in the stud so that the groove provides an abutment for supporting the control block.
  • the control block may be deformed to snap the lip into the groove.
  • the control block 80 is arranged on the stud 49 between the groove 94 and the hub 60 of the cam follower lever arm 59.
  • control member is formed with a first control cam surface 85 comprising a series of steps 86, 87 and 88 differentiated by dimension in height and equal in number to the number of pattern cams 52, 53 and 54 in the pattern cam stack.
  • a sloping ramp 89 is formed between each of the steps to ease the transition from one step to the other.
  • the control block 80 is formed with a second control cam surface 95 preferably comprising a serrated confirmation of alternating cam lobes 96 and depressions 97.
  • the second control cam surface 95 on the control block 80 is tracked by the follower pin 71 on the throwout lever 67.
  • an operator influenced lever 100 which is pivoted on a shouldered screw 101 in the machine frame is formed with a handle 102 located exteriorly of the machine frame.
  • a connection pin 103 carried in the control block passes through an aperture 104 in the lever 100 so that by turning the handle 102 the sewing machine operator may slide the control block relatively to the stud 49 for cam selection.
  • An arched spring washer 105 may be constrained against the lever 100 by the screw 101 frictionally to maintain any selected position of the lever 100.
  • the first and second control cam surfaces 85 and 95 on the control block 80 are correlated relatively to each other when the block is manufactured so that the control block may be tailored for a particular sewing machine.
  • the follower throw-out lever 67 will be operated by a lobe 96 of the second control cam surface to free the pattern cam follower finger 61 from the cam stack during each shift of the cam follower lever arm axially along the stud 49 by the first control cam surface 85.
  • the follower pin 71 of the throw-out lever 67 will traverse a lobe 96 of the second control cam surface 95 forcing the needle jogging mechanism away from the cam stack and allowing the light coil spring 73 to move the cam follower finger 61 from the cam stack so that interference therebetween will be obviated.
  • the depressions 97 in the second control cam surface 95 are positioned to influence the follower pin 71 of the throw-out lever to release the needle jogging linkage in positions in which each of the steps 86, 87 and 88 of the first control cam surface are effective, so that the pattern cam follower will be returned into pattern cam tracking relation in each of the possible cam follower positions.
  • the mechanism of this invention therefore, provides for a single integral control member which may be formed by a molding process and in which the relationship between the follower selecting cam surface and the follower retracting cam surface may be predetermined and fixedly established in the control block.
  • the control block thus can be tailoredto match the cam selection requirements of any machine construction, and adjustment or assembly during manufacture of the machine is completely obviated.
  • a cam selection mechanism for a needle jogging mechanism in the frame of a zigzag sewing machine in which a cam follower arm interposed between the needle jogging mechanism and any selected one pattern cam of a stack of pattern cams is slidably pivoted on a stud which extends relatively to an abutment in the machine frame substantially parallel to the stack of pattern cams, said cam selection mechanism comprising an integral control block slidably pivoted on said stud between said cam follower arm and said machine frame abutment, a manual influenced actuating member in said sewing machine operatively connected to said control block, a first control cam surface formed on said control block and engageable with said cam follower arm to shift said cam follower arm axially along said stud into tracking relation with any selected one of the pattern cams in said stack, a second control cam surface formed on said control block, and linkage carried by said sewing machine and responsive to said second control cam surface for separating said cam follower arm from tracking relation with said pattern cam during shift of said cam follower arm by
  • a cam selection mechanism as set forth in claim 1 in which means are provided by biasing said needle jogging mechanism toward said cam stack and said linkage responsive to said second control cam surface member formed with an elongated stud embracing slot, said first control cam surface comprising a series of steps formed along said slot differentiated by dimension in the direction in which the slot passes through said control block and equal in number to the number of pattern cams in said pattern cam stack, and in which said second control cam'surface comprises a series of alternate lobes and depressions varying in dimension perpendicular to the direction in which the slot passes through said control block.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US171935A 1971-08-16 1971-08-16 Cam selector mechanisms for sewing machines Expired - Lifetime US3699910A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US17193571A 1971-08-16 1971-08-16

Publications (1)

Publication Number Publication Date
US3699910A true US3699910A (en) 1972-10-24

Family

ID=22625704

Family Applications (1)

Application Number Title Priority Date Filing Date
US171935A Expired - Lifetime US3699910A (en) 1971-08-16 1971-08-16 Cam selector mechanisms for sewing machines

Country Status (5)

Country Link
US (1) US3699910A (enExample)
BR (1) BR7205571D0 (enExample)
FR (1) FR2150053A5 (enExample)
GB (1) GB1395626A (enExample)
IT (1) IT963600B (enExample)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2636181A1 (de) * 1975-08-11 1977-02-17 Janome Sewing Machine Co Ltd Kurvenscheiben-waehlvorrichtung
US4060044A (en) * 1976-02-09 1977-11-29 Shigeaki Kuramochi Toy sewing machine
US4066029A (en) * 1976-01-12 1978-01-03 The Singer Company Electromechanical remote cam selector for sewing machines
US4086861A (en) * 1977-02-16 1978-05-02 The Singer Company Electro-mechanical actuator
US4106419A (en) * 1976-03-16 1978-08-15 Mefina S.A. Sewing machine
US4109597A (en) * 1977-08-31 1978-08-29 The Singer Company Electro-mechanical actuator
FR2412634A1 (fr) * 1977-12-22 1979-07-20 Mefina Sa Machine a coudre a point zigzag
US4301754A (en) * 1978-06-03 1981-11-24 Sharp Kabushiki Kaisha Electric sewing machine
US4411209A (en) * 1982-07-06 1983-10-25 The Singer Company Cam selector mechanism for sewing machines
US4497267A (en) * 1984-03-19 1985-02-05 The Singer Company Low torque pattern selecting mechanism for a sewing machine

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3003442A (en) * 1954-12-16 1961-10-10 Nippon Sewing Machine Mfg Co L Stitch selector means for automatic zigzag machines
US3043252A (en) * 1959-06-13 1962-07-10 Ankerphoenix Nahmaschinen Ag Zigzag sewing machine with fancystitch selector
US3091200A (en) * 1960-09-14 1963-05-28 Sanshin Jiguzagu Mishin Seizo Pattern cam arrangement for sewing machines
US3177835A (en) * 1961-09-08 1965-04-13 Koyo Seiko Company Ltd Automatic pattern zigzag sewing machine
US3435788A (en) * 1965-11-08 1969-04-01 Mefina Sa Sewing machine
US3503350A (en) * 1967-11-20 1970-03-31 Singer Co Sewing machine cam selector mechanisms

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3003442A (en) * 1954-12-16 1961-10-10 Nippon Sewing Machine Mfg Co L Stitch selector means for automatic zigzag machines
US3043252A (en) * 1959-06-13 1962-07-10 Ankerphoenix Nahmaschinen Ag Zigzag sewing machine with fancystitch selector
US3091200A (en) * 1960-09-14 1963-05-28 Sanshin Jiguzagu Mishin Seizo Pattern cam arrangement for sewing machines
US3177835A (en) * 1961-09-08 1965-04-13 Koyo Seiko Company Ltd Automatic pattern zigzag sewing machine
US3435788A (en) * 1965-11-08 1969-04-01 Mefina Sa Sewing machine
US3503350A (en) * 1967-11-20 1970-03-31 Singer Co Sewing machine cam selector mechanisms

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2636181A1 (de) * 1975-08-11 1977-02-17 Janome Sewing Machine Co Ltd Kurvenscheiben-waehlvorrichtung
US4084523A (en) * 1975-08-11 1978-04-18 Janome Sewing Machine Co. Ltd. Cam selecting device for a sewing machine
US4066029A (en) * 1976-01-12 1978-01-03 The Singer Company Electromechanical remote cam selector for sewing machines
US4060044A (en) * 1976-02-09 1977-11-29 Shigeaki Kuramochi Toy sewing machine
US4106419A (en) * 1976-03-16 1978-08-15 Mefina S.A. Sewing machine
US4086861A (en) * 1977-02-16 1978-05-02 The Singer Company Electro-mechanical actuator
US4109597A (en) * 1977-08-31 1978-08-29 The Singer Company Electro-mechanical actuator
FR2412634A1 (fr) * 1977-12-22 1979-07-20 Mefina Sa Machine a coudre a point zigzag
US4301754A (en) * 1978-06-03 1981-11-24 Sharp Kabushiki Kaisha Electric sewing machine
US4411209A (en) * 1982-07-06 1983-10-25 The Singer Company Cam selector mechanism for sewing machines
US4497267A (en) * 1984-03-19 1985-02-05 The Singer Company Low torque pattern selecting mechanism for a sewing machine

Also Published As

Publication number Publication date
IT963600B (it) 1974-01-21
BR7205571D0 (pt) 1973-07-10
FR2150053A5 (enExample) 1973-03-30
GB1395626A (en) 1975-05-29

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AS Assignment

Owner name: SSMC INC., A CORP. OF DE, CONNECTICUT

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SINGER COMPANY, THE;REEL/FRAME:005041/0077

Effective date: 19881202