Machine element or mechanism – Mechanical movements – Rotary to alternating rotary
Patent
1974-11-01
1977-11-01
Scott, Samuel
Machine element or mechanism
Mechanical movements
Rotary to alternating rotary
F16H 2140
Patent
active
040560120
ABSTRACT:
A warp knitting machine includes a linkage system for translating the rotational motion of a drive crank into a back and forth movement suitable for a weft inserting mechanism. The linkage system includes five separate linkage elements. A first linkage element drives a second linkage element which in turn causes a third linkage element to rotate around a fixed reference point. A fourth linkage element is connected to the junction of the second and third linkage elements at one end and at the other end is connected to a fifth linkage element. The fifth linkage element is pivoted in the center thereof. The rotational motion of the first linkage element causes the fifth linkage element to move in a backward and forward direction. The linkage elements are arranged relative to one another according to a special relationship which helps to smooth out the accelerative forces and to prevent dead points where the linkage elements may lock. The smoother accelerative characteristic is achieved in part by making the distance between the fixed end of the third linkage and the pivot point of the fifth linkage less than the effective length of the third linkage itself. Additionally, the effective length of the third linkage element is deliberately made greater than the distance from the pivot section of the fifth linkage to the point of connection between the fourth linkage and the fifth linkage.
REFERENCES:
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patent: 2830455 (1958-04-01), Harmon
patent: 2873611 (1959-02-01), Biermann
patent: 2946243 (1960-07-01), Gothe
Ratliff, Jr. Wesley S.
Scott Samuel
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