Each piece to be registered by the counter moves in the direction of arrow P and runs against lever 1, turning it clockwise about fixed axis A. This turns ratchet wheel 2 and pawl 3 through one tooth about axis A. Pawl 4 turns about fixed axis C and prevents reverse rotation of wheel 2. Disk 5 with a scale indicates the number of pieces that have passed the counter. Disk 5 is zeroed (returned to its initial position) by pressing projection a of cam 6 which forces pawls 3 and 4 away from ratchet wheel 2. Then wheel 2 together with disk 5 is turned backwards by wound-up spiral spring 7 to their initial position. Springs 8 and 9 return lever 1 and cam 6 to their working position when projection a is released.
$1845$LR,M$