Finisher including height adjustment unit

A finisher comprising:

• a first portion extending in a vertical direction and including a height adjustment unit;
• a second portion extending from the first portion in a lateral direction and including a finishing unit to perform a finishing process;
• and
• a stacker to receive paper discharged from the finishing unit, the stacker extending in an opposite direction to the second portion in the lateral direction,
• wherein the height adjustment unit is to adjust a height of the second portion from an installation surface, the height adjustment unit including:
• a motor;
• and
• a gear assembly coupled to the motor to adjust the height of the second portion.

A non-transitory computer-readable recording medium on which instructions for automatically controlling a height of a finisher is recorded, the non-transitory computer-readable recording medium comprising:

• instructions to receive, from an image forming apparatus, identification information of the image forming apparatus;
• instructions to obtain a docking height of the image forming apparatus;
• instructions to obtain a height of a second portion of the finisher;
• instructions to, if the height of the second portion is different from the docking height of the image forming apparatus, automatically change the height of the second portion and transmit docking instructions to the image forming apparatus;
• and
• instructions to, if the height of the second portion matches the docking height of the image forming apparatus, transmit the docking instructions to the image forming apparatus.