Patent GB-132618-A (GB)
IPC: D03D43/00
Abstract: 132,618. Ter Weer, B. H. Sept. 21, 1918. Change-box motions.-In drop-box motion in which the drop-box is positioned by lifting-hooks controlled by needles and one or two main card chains and cylinders, an independently-actuated auxiliary cylinder is provided, and the cylinders are interconnected and so arranged that the main cylinders can be controlled directly through their cards or indirectly through their cards and those of the auxiliary cylinder as described below. As shown in Fig. 1, main cylinders 5, 9 with card chains 1, 10 are rotatably mounted on an oscillated lever 7, pivoted at 8, and are turned by ratchet-wheels 17, 76 and pawls 16, 23, which are connected by links 19, 25 to levers 20, 26 pivoted at 21 and resting on cards 28 on a cylinder 29. The cards 28 have projections 70, 27 arranged according to pattern to raise the levers 20, 26 respectively and hold the pawls 16, 23 out of action. The cylinder 29 is rotated by a ratchetwheel 32 and a pawl 23 pivoted to an arm 34 on a shaft 35, which is constantly oscillated by a lever 37 and a pin 38 on the rising and falling rod 4 carrying the lifting-bar for the hooks controlled by the needles on which the cards of the main cylinders act. The pawl 33 may be held raised out of action by a tumbler lever 39 on a shaft 40, which can be turned to lower the lever 39 by an arm controlled by a spring needle. 44 belenging to the set on which the card chain 1 acts and operated by an end extension of one of the cards. An end extension of one of the cards 10 also acts on a spring needle to rock a lever engaging a pin on another arm on the shaft 40 and thus lower the lever 39. The cylinder 5 thus acts to stop and start the cylinder 9, and vice versa, through the projections 27, 70 and the levers 26, 20. The auxiliary cylinder 51, provided according to the invention, carries an endless band 54 with projections 53, and is rotated by a ratchet-wheel and a pawl 56 pivoted to an arm 57 on the constantly oscillated shaft 35. A spring 61 normally holds the pawl 56 inoperative, and is engaged by pins 58 on a bent arm 59, which is moved to the right to render the pawl operative when a spring needle 60 is pushed in by an end extension of one of the cards of the chain 10. A lever 62 on a shaft 63 rests on the band 54, and a curved lever 64 on the same shaft supports a guided pin 66 under the pawl 23, the arrangement being such that, when a projection 53 raises the lever 62, the pin 66 is lowered and allows the pawl 23 to become operative to turn the cylinder 9. The auxiliary cylinder 51 thus controls the operation of the main cylinder 9, and the projections 53 on its band 54 may be arranged to stop the rotation of the cylinder 9 for the insertion of a number of wefts of the same colour. The cylinder 9 may be provided with a second ratchetwheel with its teeth arranged in the opposite direction to those of the wheel 76 and adapted to be engaged by a counterbalanced pawl arranged below the cylinder and engaged by an extension of the pin 66, so that the auxiliary cylinder acts to control the direction of rotation of the cylinder 9 and the weaving of fabrics with symmetrical patterns is facilitated, projections and spaces being arranged alternately on the band 54. The provision of an additional projection enables the rotation of the cylinder 9 to continue in the same direction. When the loom is stopped, a shaft is turned by a loom part or a foot-pedal connected by a rod or wire to an arm on the shaft, and several arms on the shaft connected by links to the various pawls render these inoperative, while a cranked bridle on the shaft presses back the lifting-hooks.