US3766871A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Zig zag sewing machine
Assignee: Maruzen Sewing Machine Co Ltd
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Filing: 1972-07-07
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Granted: 1973-10-23
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Expires: 1992-07-07
Abstract
Abstract A zig zag sewing machine has a stack of built-in cams, one of which controls the stitch length while the remainder control the zig zag stitch pattern. One of a series of drop-in cams is removably mounted coaxially on said stack. A first cam follower connected with the needle bar is selectively movable into registration with each of the stacked zig zag cams and the dropin cam. A second cam follower connected to the stitch length control mechanism of the machine is selectively movable into registration with the stitch length control cam. The means for selectively moving said followers are integrated and controlled by a single knob so that when the first cam follower is moved into registration with any one of the zig zag cams in the stack, the second cam follower is disposed in registration with the stitch length control cam and, when the first cam follower is moved into registration with the drop-in cam, the second cam follower is automatically moved out of registration with the stitch length control cam to render the operation thereof ineffective. A third cam follower connected to the second cam follower is disposed in registration with the drop-in cam and is arranged to control the stitch length when the built-in stitch length cam is rendered ineffective.
Inventors
- 👤 K Mastuda
- 👤 T Nishigami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 07:58
CPC Classifications
D; D05; D05B; D05B19/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
367 words
In a sewing machine having stitch width regulating mechanism and stitch length regulating and reversing mechanism, a plurality of built-in rotatable cams arranged coaxially in stacked relation, the lowermost cam controlling the stitch length and reverse feed and the remaining cams superposed thereon and controlling the stitch pattern, a removable cam having upper and lower cams and superposed on said stack of cams, the lower cam controlling the stitch pattern and the upper cam controlling the stitch length and reverse feed, a first cam follower arranged to cooperate with said cams and mounted for pivotal and axial movement on a shaft disposed in parallel relation to said cams, said follower being connected to said stitch width regulating mechanism, means for selectively shifting said first cam follower axially of said shaft to align said follower in registration with one of said cams in said stack except the lowermost cam and also with the lower cam of said removable cam, first means for rocking said first cam follower momentarily out of engagement with said cams as said follower is axially shifted from one cam to an adjacent cam, a second cam follower mounted for pivotal and axial movement on another shaft disposed in parallel relation to said cams, said second cam follower being connected to said stitch length regulating and reversing mechanism, said second cam follower arranged to cooperate with the lowermost cam in the stack, a third cam follower operatively connected to said second cam follower for conjoint movement and arranged to cooperate with the upper cam of the removable cam, second means for moving said second cam follower out of cooperative engagement with said lowermost cam and rendering the same ineffective when said first cam follower is moved into cooperative registration with the lower cam of said removable cam, a single control means operatively connected to each of said first and second means for selectively moving said first follower into registration with any one of the cams in said stack or with the lower cam of said removable cam, said second follower when said first follower is in registration with the lower cam being disposed out of registration with the lowermost cam and rendering the same ineffective.
Claim 2
Dependent Claim
367 words
In a sewing machine having stitch width regulating mechanism and stitch length regulating and reversing mechanism, a plurality of built-in rotatable cams arranged coaxially in stacked relation, the lowermost cam controlling the stitch length and reverse feed and the remaining cams superposed thereon and controlling the stitch pattern, a removable cam having upper and lower cams and superposed on said stack of cams, the lower cam controlling the stitch pattern and the upper cam controlling the stitch length and reverse feed, a first cam follower arranged to cooperate with said cams and mounted for pivotal and axial movement on a shaft disposed in parallel relation to said cams, said follower being connected to said stitch width regulating mechanism, means for selectively shifting said first cam follower axially of said shaft to align said follower in registration with one of said cams in said stack except the lowermost cam and also with the lower cam of said removable cam, first means for rocking said first cam follower momentarily out of engagement with said cams as said follower is axially shifted from one cam to an adjacent cam, a second cam follower mounted for pivotal and axial movement on another shaft disposed in parallel relation to said cams, said second cam follower being connected to said stitch length regulating and reversing mechanism, said second cam follower arranged to cooperate with the lowermost cam in the stack, a third cam follower operatively connected to said second cam follower for conjoint movement and arranged to cooperate with the upper cam of the removable cam, second means for moving said second cam follower out of cooperative engagement with said lowermost cam and rendering the same ineffective when said first cam follower is moved into cooperative registration with the lower cam of said removable cam, a single control means operatively connected to each of said first and second means for selectively moving said first follower into registration with any one of the cams in said stack or with the lower cam of said removable cam, said second follower when said first follower is in registration with the lower cam being disposed out of registration with the lowermost cam and rendering the same ineffective.
Claim 3
Dependent Claim
24 words
The invention as defined in claim 1 including means for selectively varying the stitch length and stitch width independently of said cams and followers.
Claim 4
Dependent Claim
81 words
The invention as defined in claim 1 in which the means for selectively axially shifting said first cam follower includes a first fulcrumed lever having one end operatively engaged with said follower and having a member depending from the other end, and in which the control means includes a rotatable shaft carrying an eccentric cam, the depending member being in engagement with said cam and arranged to be moved by the rotation of said cam thereby to rock said first lever.
Claim 5
Dependent Claim
69 words
The invention as defined in claim 3 in which the means for rocking said first cam follower includes an extension arm and a second fulcrumed lever having one end engaging said arm and in which the rotatable shaft carries a face cam having uniformly spaced valleys and ridges engaged by the other end of said second lever, the movement of said first and second levers being in timed relation.
Claim 6
Dependent Claim
115 words
The invention as defined in claim 3 in which the second cam follower is spring biased normally to cooperatively engage with said lowermost cam and the means for moving said follower includes the first fulcrumed lever having an extension carrying a pin, an actuating member having a finger operatively engaging said second cam follower and a link connected at one end to said actuating member, the opposite end of said link having an elongated slot in which the pin is slidably received, said pin when engaged with the end of said slot effecting rocking of said actuating member to cause the finger to shift said second cam follower out of registration with said lowermost cam.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |