US3503350A - Sewing machine cam selector mechanisms - Google Patents

Sewing machine cam selector mechanisms Download PDF

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Publication number
US3503350A
US3503350A US684425A US3503350DA US3503350A US 3503350 A US3503350 A US 3503350A US 684425 A US684425 A US 684425A US 3503350D A US3503350D A US 3503350DA US 3503350 A US3503350 A US 3503350A
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US
United States
Prior art keywords
cam
arm
cam follower
post
bell crank
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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US684425A
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English (en)
Inventor
Danilo P Buan
August Monteiro
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.)
SSMC Inc
Original Assignee
Singer Co
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Filing date
Publication date
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Publication of US3503350A publication Critical patent/US3503350A/en
Anticipated expiration legal-status Critical
Assigned to SSMC INC., A CORP. OF DE reassignment SSMC INC., A CORP. OF DE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SINGER COMPANY, THE
Expired - Lifetime legal-status Critical Current

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    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B19/00—Programme-controlled sewing machines

Definitions

  • a cam selector mechanism for a multi-cam zigzag sewing machine in which the spring bias exerted by the needle jogging control linkage on the cam follower is withdrawn from the cam follower during ca-m selection by operation of the same cam selecting mechanism by Which the cam follower is shifted from one. cam to another so that the cam follower is substantially free of frictional drag while being moved from one cam to another.
  • This invention relates to zigzag sewing machines having a plurality of individually selectable pattern cams for producing predetermined patterns of zigzag stitches, and more particularly, to operator influenced mechanisms for effecting selection of the pattern cam which will be utilized to influence the zigzag stitching.
  • the cam follower When it is desired to change the zigzag stitch pattern of such known sewing machines, the cam follower must be moved sufficiently far from the cam stack so that it can clear the pattern cam edges during the relative shifting movement and in so doing, the bias exerted by the needle jogging control linkage must be overcome.
  • Another object of this invention is to provide an improved cam selector mechanism in accordance with the foregoing object in which the spring bias of the needle jogging linkage is withdrawn from the cam follower during cam selection by manual operation of the same cam selecting mechanism by which the cam follower is shifted from cooperation with one cam to another.
  • FIG. 1 is a top plan view of a sewing machine with the top cover removed to show the improved cam selector mechanisms
  • FIG. 2 is a perspective view of the cam selector mechanism for the forward cam follower with the handle of the cam selector mechanism for the rear cam follower shown in phantom;
  • FIG. 3 is a perspective view of the cam selector mechanism for the rear cam follower with the handle of the cam selector mechanism for the forward cam follower shown in phantom.
  • FIG. 1 the invention is shown embodied in a sewing machine having a frame 11 of which the top of a standard 12, a bracket arm 13 extending laterally from the top of the standard, and a sewing head 14 at the free end of the bracket arm are shown.
  • the top cover is removed to show the inside of the bracket arm.
  • a control panel 15 is connected to the front of the bracket arm and standard.
  • a needle bar gate 20 mounted in the sewing head is a needle bar gate 20.
  • the needle bar gate is pivotally connected at an intermediate portion to the sewing head by a hinge pin 21.
  • a needle bar 22 is slidably mounted in the front end of the needle bar gate. Endwise reciprocating motion is imparted to the needle bar by a conventional crank mechanism indicated generally at 23.
  • the crank mechanism is mounted on the head end of an arm shaft 24 which extends longitudinally through the bracket arm and is journaled in two partitions 25 and 26, one in the head end of the bracket arm and the other in the top of the standard.
  • a handwheel 27 is mounted on the standard end of the arm shaft. Pivotally connected to the rearmost end of the needle bar gate by a pivot screw 28 is a connecting rod 29, the free end of which extends into the bracket arm.
  • An integrating plate 30 is pivotally connected to the free end of the connecting rod by a vertical hinge pin 31.
  • Pivotally mounted in the bottom of the bracket arm in the vicinity of the integrating plate by a pivot pin 32 is a bell crank 33 having two arms 34 and 35.
  • One of the arms of the bell crank is formed in the shape of a hook.
  • a main tension coil spring 36 is stretched between the hooked arm 34 of the bell crank and a stud 37 in the sewing head biasing the other arm of the bell crank against the integrating plate States Patent of R. E. Johnson, No. 2,862,468, granted Dec. 2, 1958.
  • the cam stack includes a vertical cam shaft 39 which is journaled in the bottom of the bracket arm.
  • Rotation is imparted to the cam shaft through a worm 40 on the arm shaft and a mating worm wheel 41 on the cam shaft.
  • a plurality of cams 42 having peripheral cam surfaces 43 are mounted on the cam shaft and are fixed to rotate with the cam shaft by a vertical pin 44.
  • cam follower mechanisms mounted in the bracket arm beside the cam stack are two cam follower mechanisms indicated generally at 45 and 46.
  • the cam follower mechanisms are mounted on two posts 47 and 48 which are carried vertically in the bottom of the bracket arm parallel to the cam shaft.
  • the front cam follower mechanism 45 is illustrated with the parts associated therewith.
  • a bell crank 49 is mounted on the forward post.
  • the bell crank includes a collar 50 by which it is slidably mounted on the post, a free arm 51, and a cam follower arm 52.
  • the cam follower arm extends between the cam stack and the integrating plate 30 and has a cam following projection 53 which tracks the peripheral cam surface 43 of one of the, cams, as well as a contacting surface 54 which contacts the integrating plate.
  • Slots 55 corresponding to vertical spacing of the cams are formed in the post 47, and a slot 56 is formed in the collar to communicate with a selected one of the slots in the post.
  • the bracket is pivotally connected by a pivot screw 59 to a crank arm 60.
  • the crank arm is perpendicularly connected to oneof two arms 61 and 62 of a U-shaped bracket 63 which is pivotally mounted on a rod 64 with the rod spanning the two arms of the bracket.
  • the rod is slidably journaled in two bosses 65 and 66 in the bracket arm.
  • a hollow sleeve 67 is pivotally mounted on the rod with one end connected to the innermost arm 62 of the U-shaped bracket 63.
  • a bearing flange 68 is formed on the free end of the hollow sleeve.
  • a crank arm 69 is formed on the free end of the outermost arm 61 of the U-shaped bracket 63 and extends through the front of the bracket arm and the control panel.
  • a knob 70 is pressed onto the free end of the last mentioned crank arm 69.
  • the cam follower arm 52 of the bell crank is biased away from the peripheral cam surface 43 of one of the cams and towards the integrating plate 30 by a torsion spring 71 mounted by a screw 72, on the bracket 58.
  • a limb 73 of the torsion spring bears against the free arm 51 of the bell crank 49.
  • FIG. 3 the rear cam follower mechanism 46 is illustrated together with the parts associated therewith.
  • a bell crank 74 is slidably pivoted on the rear post 48.
  • the bell crank 74 includes a collar 75 by which it is slidably mounted on the post, a free arm 76, and a cam follower arm 77.
  • the cam follower arm extends between the cam stack and the integrating plate 30 and has a cam follower 78 which tracks the peripheral cam surface 43 of one of the cams and a contacting surface 79 which contacts the integrating plate.
  • Slots 80 corresponding to the vertical spacing of the cams are formed in the post 48 and a slot 81 is formed in the collar 75 to communicate with a selected one of the slots in the post.
  • a blade 82 extending perpendicularly from a bracket 83 slidably seats in the slot 81 in the collar and in one of the slots 80 in the post.
  • the bracket 83 is pivotally connected by a pivot screw 84 to a crank arm 85 which is fast on a collar 86 by which the crank arm 85 is secured on the end of the rod 64 by a set screw 87.
  • Also mounted on the rod 64 by a set screw 88 is a bracket 89 which is mounted between the arms of the U-shaped bracket 63.
  • a crank arm 90 is formed on the bracket 89 and extends through the front of the bracket arm and the control panel.
  • a knob 91 is pressed onto the free end of the last mentioned crank arm 90.
  • a bell crank throw-out lever 92 is pivotally mounted on the rear post, as shown in FIG. 2.
  • the lever 92 has a free arm and a contacting arm 94 which extends between the cam stack and the integrating plate for contacting the integrating plate.
  • a bracket 95 is mounted on the free arm 93 of the throw-out lever by two screws 96.
  • the bracket 95 has an upwardly extending bearing arm 97 which contacts the end of the bearing flange 68 on the sleeve 67 and an arm 98 having a notch "99.
  • the bearing flange 68 on the sleeve 67 thus constitutes projection means on the operator influenced assembly 63, 67, 70 by which the throw-out lever can be operated.
  • a tension coil spring 100 is stretched between the notch 99 and a second notch 101 in an arm 102 on a second bracket 103 mounted in the bracket arm by two screws 104.
  • the tension coil spring 100 biases the contacting arm 94 of the bell crank lever away from the integrating plate 30 and biases the upwardly extending bearing arm 97 against the end of the bearing flange 68 on the sleeve.
  • a second bell crank throw-out lever 105 is pivotally mounted on the rear post, as shown in FIG. 3.
  • the second throw-out lever is held on the post by a split ring clip 106 and has a U-shaped free arm 107 having two limbs 108 and 109 and a cross-bar 110- between the limbs.
  • the rear post 48 spans the two limbs with the cross-bar oriented vertically and parallel to the post.
  • the second throw-out lever 105 also has a contacting arm 111 which extends between the cam stack and the integrating plate 30 for contacting the integrating plate.
  • the crank arm 85 on the end of the rod 64 constitutes a projection means on the operator influenced rod 64 by which the throw-out lever 105 can be operated by contacting the forward edge of the cross-bar 110 of the U-shaped free arm of the second throw-out lever.
  • the free arm 76 of the bell crank cam follower 74 on the rear post contacts the rear edge of the cross-bar 110 to hold the contacting arm 111 of the throw-out lever 105 out of contact with the integrating plate 30 except while cam selection is being accomplished.
  • the crank arm 69 is released causing the perpendicularly extending blade 57 to seat in the appropriate slot 55 in the post to lock the bell crank arm follower 49 against axial movement on the post.
  • the contacting arm 94 of the throw-out lever 92 is allowed to be pulled away from the integrating plate 30 by the tension coil spring 100, and the main tension coil spring 36 biases the integrating plate against the contacting surface 54 of the cam follower arm 52.
  • the foregoing movement causes the throw-out lever 105 to pivot, with the contacting arm 111 of the throw-out lever pushing the integrating plate 30 against the force of the main tension coil spring 36 out of contact with the contacting surface 79 of the cam follower arm 77.
  • the shifting movement of the crank arm 85 on the end of the rod 64 also pushes the perpendicularly extending blade 82 out of the slot 80 in the rear post so that the bell crank cam follower 74 is free to move axially on the post.
  • the perpendicularly extending blade although out of contact with the post, remains in the edge of the slot 81 in the collar.
  • crank arm 90 causes the bell crank cam follower 74 to move downwardly on the post while counterclockwise cranking movement of the crank arm causes the bell crank cam follower to move upwardly on the post.
  • the cam follower 78 is held far enough away from the cam surfaces 43 of the cams 42 by the action of the cross bar 110 of the U-shaped free arm 107 of the second throw-out lever 105 against the free arm 76 of the bell crank cam follower 74 to clear all of the cams, and the integrating plate 30 is held out of contact with the contacting surface 79 of the cam follower arm 77 by the contacting arm 111 of the second throw-out lever 105.
  • the cam follower arm 77 can be moved to a position opposite another cam without contacting the integrating plate.
  • the crank arm 85 is released causing the perpendicularly extending blade 82 to seat in the appropriate slot 80 in the post to lock the bell crank arm follower 74 against axial movement on the post.
  • the contacting arm 111 of the second throw-out lever 105 is moved away from the integrating plate 30 by action of the main tension coil spring 36 through the free arm 76 of the bell crank cam follower 74 on the rear post, and the main tension coil spring biases the integrating plate against the contacting surface 79 of the cam follower arm 77.
  • cam followers 53 and 78 can be moved to other cams to change the stitch pattern.
  • the invention permits the foregoing movements without hindrance from the integrating plate 30 to sharply reduce wear of parts and without adding any new operations on the part of the operator.
  • the integrating late is moved out of the way of a cam follower arm 52 or 77 during the very same operation by which the cam follower arm is moved to another cam.
  • a cam selector mechanism comprising operator influenced cam follower shifting means carried on said sewing machine for shifting said cam follower into tracking relation with any selected one of said plurality of pattern cams, a bell crank throw-out lever shiftably supported on said sewing machine in spaced relation to said cam follower, said bell crank throw-out lever having an effective position in engagement with said needle jogging control linkage and sustaining said needle jogging control linkage out of said biased position against said cam follower, and a projection carried by said operator influenced cam follower shifting means for engaging a free arm of said bell crank throw-out lever and maintaining said bell crank throw
  • cam follower is a bell crank lever having a free arm which contacts the free arm of the bell crank throw-out lever to shift the contacting arm of the bell crank throw-out lever out of engagement with the needle jogging control linkage when the bell crank cam follower is in contact with the cam surface of one of the cams.
  • a needle jogging control linkage including an integrating plate engageable by said plurality of cam followers, and spring means biasing said integrating plate against said plurality of cam followers
  • a cam selector mechanism comprising separate operator influenced cam follower shifting means carried on said sewing machine, one cooperating with each of said plurality of cam followers for shifting said cam followers into tracking relation with any selected one of said plurality of pattern cams, separate throw-out member shiftably supported on said sewing machine and associated one with each of said plurality of cam followers, said throw-out members each having an effective position in engagement with said integrating plate and sustaining said integrating plate out of said spring biased position against the cam follower associated with said throw-out member, and means carried by each of said separate operator influenced cam shifting means for shifting and maintaining in effective position that one of said throw-out members which is associated with the cam follower shifted by said operator influenced means during shift of the
  • each of the throw-out members are bell crank levers and each of the operator influenced cam follower shifting means includes a projection means which bears against a free arm of one of said bell crank levers to pivot a contacting arm of one of said bell crank levers against the integrating plate to move the integrating plate out of contact with the cam follower when the cam follower is being moved from one cam to another.
  • each of the two cam followers is slidable and pivotally mounted on a separate post each of said posts being substantially j parallel to the cam shaft, and in which the two throw-out member bell crank levers are pivotally mounted on the same one of the posts;

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
  • Treatment Of Fiber Materials (AREA)
US684425A 1967-11-20 1967-11-20 Sewing machine cam selector mechanisms Expired - Lifetime US3503350A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US68442567A 1967-11-20 1967-11-20

Publications (1)

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US3503350A true US3503350A (en) 1970-03-31

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Family Applications (1)

Application Number Title Priority Date Filing Date
US684425A Expired - Lifetime US3503350A (en) 1967-11-20 1967-11-20 Sewing machine cam selector mechanisms

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US (1) US3503350A (de)
BR (1) BR6804118D0 (de)
DE (2) DE6807456U (de)
FR (1) FR1592689A (de)
GB (1) GB1200520A (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3596618A (en) * 1970-04-17 1971-08-03 Singer Co Automatic buttonhole mechanisms for zigzag sewing machines
US3699910A (en) * 1971-08-16 1972-10-24 Singer Co Cam selector mechanisms for sewing machines

Citations (1)

* 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

Patent Citations (1)

* 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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3596618A (en) * 1970-04-17 1971-08-03 Singer Co Automatic buttonhole mechanisms for zigzag sewing machines
US3699910A (en) * 1971-08-16 1972-10-24 Singer Co Cam selector mechanisms for sewing machines

Also Published As

Publication number Publication date
DE6807456U (de) 1969-05-08
DE1809517A1 (de) 1969-10-16
BR6804118D0 (pt) 1973-04-12
FR1592689A (de) 1970-05-19
GB1200520A (en) 1970-07-29

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Legal Events

Date Code Title Description
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