Sheet conveyance apparatus controlling direction for conveying sheet, and image forming apparatus

A sheet conveyance apparatus, comprising:

• a guide member configured to guide a sheet in a first direction in a first state, and guide the sheet in a second direction in a second state;
• a driving source configured to generate a driving force for changing a state of the guide member from the first state to the second state;
• a transfer member configured to change the state of the guide member from the first state to the second state by being moved by the driving force generated by the driving source;
• a control unit configured to control the driving force of the driving source;
• and
• a measurement unit configured to measure a movement amount of the transfer member,
• wherein the control unit is further configured to, by measuring the movement amount of the transfer member while changing the driving force of the driving source, determine a relation between the movement amount of the transfer member and a load of the driving source.

An image formation apparatus, comprising:

• a sheet conveyance apparatus, and
• an image forming unit configured to form an image on a sheet conveyed by the sheet conveyance apparatus,
• wherein
• the sheet conveyance apparatus comprises:
• a guide member configured to guide a sheet in a first direction in a first state, and guide the sheet in a second direction in a second state;
• a driving source configured to generate a driving force for changing a state of the guide member from the first state to the second state;
• a transfer member configured to change the state of the guide member from the first state to the second state by being moved by the driving force generated by the driving source;
• and
• a control unit configured to control the driving force of the driving source,
• wherein the control unit is further configured to set the driving force of the driving source to a value smaller than a force necessary to move the transfer member and greater than zero when the guide member is in the first state, and subsequently cause the driving force of the driving source to increase to a value larger than the force necessary to move the transfer member when the guide member is in the first state.