Fig. 29. Rack Method of Lifting Griffe.
When using the cradle lever on a double action machine, it is necessary to have two different sizes of lifting cranks to allow extra lift for the difference in length of the levers, owing to one of the levers working on the inside of the other. The length of levers used is about 30 inches for the longer end, from fulcrum to connection of lifting rod, and 13 inches for the shortest end on the longer lever. Fulcrum to connection of lifting arm on the shorter lever is 25 inches, and 10 inches on the shorter end. The double crank is made so that the one with the 12-inch stroke is attached to the shorter lever, and the 10-inch stroke operates the longer lever.
Fig. 30. Pulley and Belt for Lifting Griffe.
The cradle lever lift is used only on machines that have the harnesses attached to them by the cross tie system, because by the straight tie system the machine is turned in the opposite direction; that is, one set of cards would be over the cloth in the loom, and the other set over the warp; and in the cross tie system the cards are over the sides of the loom or over shuttle boxes.
The top lever lift is considered by many to be the best method of operating the griffes, and this method can be used whether the harnesses are attached by the straight tie or the cross tie system. All that is required to be changed is that where as in the straight tie both the levers are on the same stud, and fixed to one support, the levers for the cross tie are placed on separate studs with separate supports. The reason for using separate supports and studs is to meet the different positions of the griffe bar. (See Fig. [28].)
Other lifting methods have been successfully tried on double action machines; one being a rack movement shown in Fig. [29] and another a pulley and belt lift shown in Fig. [30].
The rack movement is as follows: A 1½-inch iron shaft is supported in bearings fixed to the top of the machine. This shaft extends over the end of the machine. The supports are bolted to the cross rail of the griffe, and on these supports the racks are fixed. The shaft passes between the two racks, and the gear is fixed on the shaft in contact with the rack. An arm is set-screwed on the outer end of the shaft, and to this arm a long lifting rod is attached. The bottom of the rod is placed on a stud attached to the face of a round iron plate that is set-screwed on the pick cam shaft.