A waste ink conveying device includes a waste ink tank installed in a tank installed part, and a tank cover opening/closing the tank installed part. The tank cover includes a nozzle, a nozzle operation part and a cover locking part. The nozzle flowing a waste ink is inserted in an inflow port in the waste ink tank. The nozzle operation part switches projecting and retracting of the nozzle to insert and retract the nozzle to the inflow port. The cover locking part switches locking and unlocking of closing of the tank cover. If the cover locking part is in a locking state and the nozzle is in a retracting state, the cover locking part can be switched to an unlocking state. If the cover locking part is in the locking state and the nozzle is in a projecting state, the cover locking part cannot be switched to the unlocking state.

A waste ink conveying device includes a waste ink tank installed in a tank installed part, and a tank cover opening/closing the tank installed part. The tank cover includes a nozzle, a nozzle operation part and a cover locking part. The nozzle flowing a waste ink is inserted in an inflow port in the waste ink tank. The nozzle operation part switches projecting and retracting of the nozzle to insert and retract the nozzle to the inflow port. The cover locking part switches locking and unlocking of closing of the tank cover. If the cover locking part is in a locking state and the nozzle is in a retracting state, the cover locking part can be switched to an unlocking state. If the cover locking part is in the locking state and the nozzle is in a projecting state, the cover locking part cannot be switched to the unlocking state.

In some examples, an apparatus can include a print substance gauge to indicate a quantity of print particles an imaging device is capable of receiving at a particular time, and an authentication mechanism coupled to a locking mechanism, the authentication mechanism includes instructions to: determine a quantity of print particles within a print particle container, and unlock the locking mechanism when the print substance gauge indicates that the imagining device is capable of receiving the quantity of print particles within the print particle container.

In some examples, an apparatus can include a print substance gauge to indicate a quantity of print particles an imaging device is capable of receiving at a particular time, and an authentication mechanism coupled to a locking mechanism, the authentication mechanism includes instructions to: determine a quantity of print particles within a print particle container, and unlock the locking mechanism when the print substance gauge indicates that the imagining device is capable of receiving the quantity of print particles within the print particle container.

A printing apparatus includes a detection unit configured to detect that a predetermined user operation for unlocking an opening and closing portion is made on a predetermined screen displayed on a display portion in a state where the opening and closing portion is locked, an unlock unit configured to, in a case where the predetermined user operation is detected to be made, unlock the opening and closing portion, and an execution unit configured to, in a case where the predetermined user operation is detected to be made, execute predetermined preparation processing on a printing portion.

A printing apparatus includes a detection unit configured to detect that a predetermined user operation for unlocking an opening and closing portion is made on a predetermined screen displayed on a display portion in a state where the opening and closing portion is locked, an unlock unit configured to, in a case where the predetermined user operation is detected to be made, unlock the opening and closing portion, and an execution unit configured to, in a case where the predetermined user operation is detected to be made, execute predetermined preparation processing on a printing portion.

It is disclosed a safety interlock mechanism that comprises: a plurality of interlock switches having a first contact and a second contact; an actuator mechanically coupled to each interlock switch, the actuator having an active position wherein the actuator acts on the switch so that the first contact is in conductive state and having a passive position wherein the actuator acts on the switch so that the second contact is in conductive state; and a detection circuit connected one of the interlock switches; wherein the plurality of interlock switches are connected in series through the first contact and the detection circuit is connected to the second contact being the detection circuit an active circuit to determine the position of the actuator.

It is disclosed a safety interlock mechanism that comprises: a plurality of interlock switches having a first contact and a second contact; an actuator mechanically coupled to each interlock switch, the actuator having an active position wherein the actuator acts on the switch so that the first contact is in conductive state and having a passive position wherein the actuator acts on the switch so that the second contact is in conductive state; and a detection circuit connected one of the interlock switches; wherein the plurality of interlock switches are connected in series through the first contact and the detection circuit is connected to the second contact being the detection circuit an active circuit to determine the position of the actuator.

An image forming apparatus includes a main CPU 70. During an unused period in which the image forming apparatus is not used, the main CPU 70 detects, based on the output of a first operation detection sensor, the presence of a first operation, which is an operation that causes a concern that consumable items or the like may be stolen. When the main CPU 70 detects the first operation, theft alert audio which indicates that there is a concern that consumable items or the like may be stolen is output from a speaker. Also, the main CPU 70 transmits an email to a pre-registered destination which includes a theft alert message, which indicates that there is a concern that consumable items or the like may be stolen.

An image forming apparatus includes a main CPU 70. During an unused period in which the image forming apparatus is not used, the main CPU 70 detects, based on the output of a first operation detection sensor, the presence of a first operation, which is an operation that causes a concern that consumable items or the like may be stolen. When the main CPU 70 detects the first operation, theft alert audio which indicates that there is a concern that consumable items or the like may be stolen is output from a speaker. Also, the main CPU 70 transmits an email to a pre-registered destination which includes a theft alert message, which indicates that there is a concern that consumable items or the like may be stolen.