In a shaper machine, the mechanism for tool movement is

Explanation:

Quick return mechanism: 

• It is an apparatus to produce a reciprocating motion in which the time taken for travel in return stroke is less than in the forward stroke.
• A quick return mechanism converts the circular motion into reciprocating motion (repetitive back and forth linear motion).
• This mechanism is mostly used in shaping, planning, and slotting machines.
• In the shaper, the rotary motion of the drive is converted into the reciprocating motion of the ram by the mechanism housed within the column or the machine.
• In a standard shaper, metal is removed in the forward cutting stroke, while the return stroke goes idle and no metal is removed during this period.
• The quick return mechanism is so designed that it moves the ram holding the tool at a comparatively slower speed during the forward cutting stroke, whereas during the return stroke it allows the ram to move at a faster speed to reduce the idle return time.