Abstract: An optional device is for an electrical machine. The optional device is mountable to the electrical machine without electrical connection to the electrical machine. The optional device includes a duct, an air flow sensor, an air purifier, and a controller. Through the duct, an air flow containing an exhaust gas from the electrical machine is guided. The air flow sensor is configured to detect presence or absence of the exhaust gas from the electrical machine. The air purifier is configured to purify the exhaust gas and discharge the purified exhaust gas into an atmosphere. The controller is configured to control an operation of the air purifier based on an output from the air flow sensor.

Abstract: A staple remover for removing a staple from a bundle of papers fastened with the staple includes: a deformation assisting part that bends a part of the bundle, where the bundle has been fastened with the staple, with respect to a longitudinal direction of the staple; and a first blade inserted between the bent bundle and the staple, and removing the staple from the bundle, wherein the deformation assisting part includes a support part that supports the bundle, a communicating space is formed in the support part to allow a front surface and a back surface of the support part to communicate with each other in a thickness direction of the bundle, the bundle is disposed with the communicating space located below the staple, and the bundle enters the communicating space to be bent, by being caught between the support part and the first blade.

Abstract: A drawer unit includes: a drawer member allowed to shift toward a storage unit in an inserting direction, or shift from the storage unit in a drawing direction; a lock member rotatably supported by the drawer member; a first regulation member that engages with the lock member to regulate a shift of the drawer member when the drawer member is located at a first position; a second regulation member that engages with the lock member to regulate a shift of the drawer member when the drawer member is located at a second position; and an operation unit that receives a first operation that rotates the lock member in the drawing direction to allow engagement between the lock member and the first regulation member, and a second operation that rotates the lock member in the inserting direction to allow engagement between the lock member and the second regulation member.

Abstract: An electrical machine includes an exhaust fan and an exhaust port on which an optional device is mounted. The optional device includes a duct, an electric fan, and an air flow sensor. Through the duct, an exhaust gas from the exhaust port is guided. The electric fan draws in the exhaust gas flowing through the duct and discharges the exhaust gas into an atmosphere. The air flow sensor detects presence or absence of the exhaust gas flowing from the electrical machine. The air flow sensor includes an air path partitioned from an inside of the duct by a partition wall. The air path includes an exhaust gas and an exit port. The exhaust gas intake port includes an opening facing the exhaust gas. The exit port communicates with the atmosphere at a position outside the duct.

Abstract: A drawer unit includes: a drawer member allowed to shift toward a storage unit in an inserting direction, or shift from the storage unit in a drawing direction; a lock member rotatably supported by the drawer member; a first regulation member that engages with the lock member to regulate a shift of the drawer member when the drawer member is located at a first position; a second regulation member that engages with the lock member to regulate a shift of the drawer member when the drawer member is located at a second position; and an operation unit that receives a first operation that rotates the lock member in the drawing direction to allow engagement between the lock member and the first regulation member, and a second operation that rotates the lock member in the inserting direction to allow engagement between the lock member and the second regulation member.

Abstract: An optional device is for an electrical machine. The electrical machine includes an exhaust fan and an exhaust port on which the optional device is mounted. The optional device includes a duct, an electric fan, and an air flow sensor. Through the duct, an exhaust gas from the exhaust port is guided. The electric fan draws in the exhaust gas flowing through the duct and discharges the exhaust gas into an atmosphere. The air flow sensor detects presence or absence of the exhaust gas flowing from the electrical machine. The air flow sensor includes an air path partitioned from an inside of the duct by a partition wall. The air path includes an exhaust gas and an exit port. The exhaust gas intake port includes an opening facing the exhaust gas. The exit port communicates with the atmosphere at a position outside the duct.

Abstract: An optional device is for an electrical machine. The optional device is mountable to the electrical machine without electrical connection to the electrical machine. The optional device includes a duct, an air flow sensor, an air purifier, and a controller. Through the duct, an air flow containing an exhaust gas from the electrical machine is guided. The air flow sensor is configured to detect presence or absence of the exhaust gas from the electrical machine. The air purifier is configured to purify the exhaust gas and discharge the purified exhaust gas into an atmosphere. The controller is configured to control an operation of the air purifier based on an output from the air flow sensor.