Turn yellow lever counterclockwise: blue shaft rotates clockwise and move down at rate of Sd mm/rev.
Turn yellow lever clockwise: blue shaft rotates counterclockwise and move up at rate of Su mm/rev.
Block of gear and pulley (in pink) receives rotation from a motor via a belt (not shown). The yellow lever controls the motor (start, stop and rotary direction) by limit switches (not shown).
The blue shaft has prismatic joint with the pink block (cyan keys).
Orange cone clutch has prismatic joint with red nut.
- When the orange clutch engages with violet gear block (rotating idly on the blue shaft), it makes the red nut and the violet block rotate together, the shaft moves down.
Sd = (1 – (Z1Z3)/(Z2Z4))*L
Z1, Z2, Z3, Z4 are tooth numbers of pink, large green, small green and violet gears respectively.
L: lead of helical joint (blue screw and violet nut) in mm.
In this video Z1 = Z3 = 25; Z2 = Z4 = 35; Sd = 0.5L
Alter the tooth numbers for desired Sd.
- When the orange clutch engages with fixed grey cone the red nut is immobile, the blue shaft moves up. Su = L, faster than Sd.