Ski jump stack height sensor

Apparatus for inverting and stacking sheet members to a predetermined height, the apparatus comprising:

• a. inverter means including a rotatable inverter disc having at least one sheet member carrying slot;
• b. stacking means for receiving individual sheet members from said carrying slot in stacked relationship;
• c. contact switch means having an actuator element positioned proximate the location of a top edge of the stack at the predetermined height;
• d. stack contacting means including at least one finger element movable in a direction substantially parallel to the surface of the top sheet member from a first position engageable with the top member of the stack, across said top edge, and to a second position engageable with said switch actuator element for stack heights less than the predetermined eight and not engageable for stack heights greater than the predetermined height, the movement of said one finger element being interrelated with the rotation of said inverter disc for moving said finger element at least after receipt of each sheet member;
• and
• e. control means responsive to said switch means and operatively connected to said stacking means for lowering the stack.