| 摘要 |
A dobby for a weaving loom, of the type in which each dobby element associated with a heddle frame or group of heddle frames comprises an actuating lever actuated by a reciprocating movement, a double swinging lever pivoted thereon and of which the ends are provided with fastening hooks, this double swinging lever being actuated by two cross-pieces carried by oscillating supports and common to all the elements of the dobby, and two retaining hooks adapted to selectively cooperate with the fastening hooks, each of these retaining hooks comprising on the one hand a first or main portion pivoted on the frame and which bears the hooking nose, on the other hand, a second selection portion pivoted on the first, connected thereto by a spring and stop system, and receiving the action of the weave mechanism, the whole being such that this mechanism may achieve the selection of the double swinging lever in question by displacing the second portion of one of the retaining hooks before the corresponding fastening hook has arrived at the end of backward stroke, this retaining hook being latched in the manner of a pawl on passage of said fastening hook to hook therebehind, while with each of the two rows of retaining hooks of the dobby there is associated a locking bar actuated by a reciprocating movement and which cooperates with the first portion of each hook of the row in question to lock this portion either in a retracted position for which the retaining hook in question cannot retain the corresponding fastening hook, or on the contrary in the engaged position for which this first portion hooks to said fastening hook, which bars alternately release the first portions of the retaining hooks during the selection, one for even strokes, the other for odd strokes, wherein in each element the second or selection portions of the two retaining hooks are actuated during selection by a single member associated with the pattern mechanism. |
