Eccentric drive for a dobby
AssigneeSulzer Brothers Limited
InventorHans Demuth
Life of this patent
Estimating the term…
Abstract
The eccentric drive for moving the heddle frames between a top shed position and a bottom shed position is constructed to form symmetrical sheds not only for large frame movements but also for small frame movements. In one embodiment, the link between the cam-actuated lever and the deflecting lever is pivoted on the deflecting lever and secured to one of a plurality of positions on the cam-actuated lever. These positions are located on a curved line which has a center of curvature located away from the axis on which the link is mounted on the deflecting lever. These positions are formed by a toothing, a row of apertures or an elongated slot.
Claims9
An eccentric drive for driving a heddle carrying frame in a weaving machine, said drive comprising
- at least one frame actuating linkage;
- a spindle;
- a double-armed deflecting lever pivotally mounted on said spindle and connected at one end to said frame actuating linkage to reciprocate said linkage in response to pivoting of said lever;
- a pivotally mounted lever;
- and
- a link having one end pivotally mounted on one of said deflecting lever and said pivotally mounted lever about a pivot axis and having an opposite end secured to the other of said deflecting lever and said pivotally mounted lever at one of a plurality of points on a curved adjusting line, said line having a center of curvature located away from said pivot axis whereby said line deviates from a circular arc having a center of curvature coincident with said pivot axis when said drive is in a bottom-shed position.
In a dobby having a plurality of heddle carrying frames, an eccentric drive for moving said frames between a top-shed position and a bottom-shed position, said drive including
- at least one frame actuating linkage;
- a spindle;
- a double-armed deflecting lever pivotally mounted on said spindle and connected at one end to said frame actuating linkage to reciprocate said linkage in response to pivoting of said lever;
- a pivotally mounted lever;
- and
- a link having one end pivotally mounted on one of said deflecting lever and said pivotally mounted lever about a pivot axis and having an opposite end secured to the other of said deflecting lever and said pivotally mounted lever at one of a plurality of points on a curved adjusting line, said line having a center of curvature located away from said pivot axis whereby said line deviates from a circular arc having a center of curvature coincident with said pivot axis when said drive is in a bottom-shed position.
Dependencies are inferred from the claim text.