Abstract: A variable speed drive system for a carding machine employs a variable pitch pulley assembly that rotates the feed cylinder and doffer cylinder at a constant slow speed as the sliver is made up to the coiler can, and after a predetermined time lapse the speed of the feed cylinder and doffer automatically and progressively increase at a fixed speed ratio from the slow speed condition to a constant high speed condition. If the sliver is not made up properly within the time lapse, the operation of the feed cylinder and doffer cylinder is automatically terminated.

Abstract: A variable speed drive system for a carding machine employs a variable pitch pulley assembly that rotates the feed cylinder and doffer cylinder at a constant slow speed as the sliver is made up to the coiler can, and after a predetermined time lapse the speed of the feed cylinder and doffer automatically and progressively increase at a fixed speed ratio from the slow speed condition to a constant high speed condition. If the sliver is not made up properly within the time lapse, the operation of the feed cylinder and doffer cylinder is automatically terminated.

Abstract: A high production textile card system is provided with an automatic variable speed drive system for driving the doffing cylinder from the main cylinder at a slow speed during system start-up and then progressively increasing the speed of the doffing cylinder after start-up. A variable speed belt drive system and clutch system are responsive to the sliver detector switch at the coiler can to control the rotation of the doffing cylinder after the system startup time has elapsed, to either terminate the rotation of the doffing cylinder if the sliver has not been properly threaded through the coiler head, or to increase the speed of rotation of the doffing cylinder with respect to the speed of rotation of the main cylinder.