A sheet processing apparatus includes a first holding unit configured to hold one or more sheets and movable in a sheet transport direction, a first drive unit configured to move the first holding unit in a first direction along the sheet transport direction, a biasing member that biases the first holding unit in a second direction opposite to the first direction, and an energy storage unit that stores energy discharged from the biasing member.

A system comprises a device (300) for receiving and transporting objects and a generator (402). The device (300) has an adjusting mechanism (305, 306) and a base (304) that can be adjusted in height by means of the adjusting mechanism (305, 306). The adjusting mechanism (305, 306) is designed in such a way that the base (304) can be lowered by a weight of objects received. The adjusting mechanism (305, 306) is also able to be connected or is connected to the generator (402) in such a way that the generator (402) is driven and converts mechanical energy into electrical energy while the base (304) is being lowered.

A conveyance apparatus according to the disclosure includes a conveyance unit that conveys a sheet, a flapper movable between a first position and a second position, a flapper moving unit that moves the flapper to the first position when power is supplied, a door to open a predetermined conveyance path and a second conveyance path, a detection unit that detects an occurrence of an abnormal state relating to the conveyance apparatus, and a control unit that, in a case where the detection unit detects the occurrence of the abnormal state while a sheet is conveyed to the first conveyance path by the conveyance unit and the flapper is in the first position, stops a sheet conveyance operation of the conveyance unit and inhibits the flapper from moving to the second position by continuing to supply power to the flapper moving unit.

A sheet processing apparatus includes a first holding unit configured to hold one or more sheets and movable in a sheet transport direction, a first drive unit configured to move the first holding unit in a first direction along the sheet transport direction, a biasing member that biases the first holding unit in a second direction opposite to the first direction, and an energy storage unit that stores energy discharged from the biasing member.

A sheet processing apparatus includes a first holding unit configured to hold one or more sheets and movable in a sheet transport direction, a first drive unit configured to move the first holding unit in a first direction along the sheet transport direction, a biasing member that biases the first holding unit in a second direction opposite to the first direction, and an energy storage unit that stores energy discharged from the biasing member.

A conveyance apparatus according to the disclosure includes a conveyance unit that conveys a sheet, a flapper movable between a first position and a second position, a flapper moving unit that moves the flapper to the first position when power is supplied, a door to open a predetermined conveyance path and a second conveyance path, a detection unit that detects an occurrence of an abnormal state relating to the conveyance apparatus, and a control unit that, in a case where the detection unit detects the occurrence of the abnormal state while a sheet is conveyed to the first conveyance path by the conveyance unit and the flapper is in the first position, stops a sheet conveyance operation of the conveyance unit and inhibits the flapper from moving to the second. position by continuing to supply power to the flapper moving unit.

Provided is an apparatus with automatic belt tensioning. A winding seat includes a first gear and a winding portion fixed at the first gear. A belt is windable around the winding portion, and the first elastic element is connected with the winding portion thus to wind the belt around the winding portion. A rotation preventing element includes a protrusion. When the protrusion retains the first gear, the winding portion is locked to prevent the belt being wound. When the belt is pulled, it drives the protrusion to be separated from the first gear and drives the winding portion to rotate. When the belt is released and the winding speed of the belt is decreased to a certain degree, the protrusion retains the first gear to prevent the belt being wound.