An image formation apparatus according to one or more embodiments includes: an engagement part to which a replacement unit with a first communication part is detachably attachable; a second communication part configured, in a state where the replacement unit is attached to the engagement part, to communicate wirelessly with the first communication part of the replacement unit; and a control unit programmed to control the second communication part. In a process of causing the second communication part to communicate wirelessly with the first communication part a plurality of times, the control unit detects a change in a response from the first communication part.

An image forming apparatus including a consumable to be used for image formation. The image forming apparatus includes: a usage amount detector configured to detect a cumulative value of a usage amount of the consumable and a remaining amount of the consumable; a predictor configured to predict a period that allows use of the consumable based on the remaining amount detected by the usage amount detector; and a determination unit configured to generate a delivery request signal for prompting a delivery request for the consumable when the period that allows the use predicted by the predictor is smaller than a predetermined number-of-day threshold value. The image forming apparatus avoids performing processing for generating a delivery request signal by the determination unit after the start of the use of the image forming apparatus until a predetermined condition is satisfied.

An image forming apparatus including a consumable to be used for image formation. The image forming apparatus includes: a usage amount detector configured to detect a cumulative value of a usage amount of the consumable and a remaining amount of the consumable; a predictor configured to predict a period that allows use of the consumable based on the remaining amount detected by the usage amount detector; and a determination unit configured to generate a delivery request signal for prompting a delivery request for the consumable when the period that allows the use predicted by the predictor is smaller than a predetermined number-of-day threshold value. The image forming apparatus avoids performing processing for generating a delivery request signal by the determination unit after the start of the use of the image forming apparatus until a predetermined condition is satisfied.

An image forming apparatus including a consumable to be used for image formation. The image forming apparatus includes: a usage amount detector configured to detect a cumulative value of a usage amount of the consumable and a remaining amount of the consumable; a predictor configured to predict a period that allows use of the consumable based on the remaining amount detected by the usage amount detector; and a determination unit configured to generate a delivery request signal for prompting a delivery request for the consumable when the period that allows the use predicted by the predictor is smaller than a predetermined number-of-day threshold value. The image forming apparatus avoids performing processing for generating a delivery request signal by the determination unit after the start of the use of the image forming apparatus until a predetermined condition is satisfied.

An image forming apparatus including a consumable to be used for image formation. The image forming apparatus includes: a usage amount detector configured to detect a cumulative value of a usage amount of the consumable and a remaining amount of the consumable; a predictor configured to predict a period that allows use of the consumable based on the remaining amount detected by the usage amount detector; and a determination unit configured to generate a delivery request signal for prompting a delivery request for the consumable when the period that allows the use predicted by the predictor is smaller than a predetermined number-of-day threshold value. The image forming apparatus avoids performing processing for generating a delivery request signal by the determination unit after the start of the use of the image forming apparatus until a predetermined condition is satisfied.

An image forming apparatus includes a processing unit, a main frame, a drive source, and a door-type positioning panel. The processing unit performs at least part of image formation. The main frame supports the processing unit such that the processing unit is pulled out or housed. The drive source is provided on the main frame and connected to a first end of a processing drive shaft of the processing unit to provide rotative power. The door-type positioning panel positions and supports a second end of the processing drive shaft by using an insert hole. An end of the door-type positioning panel is supported by the main frame such that the panel swings on a support axis. The door-type positioning panel includes a fit hole that is closer to a swinging end of the panel than to the support axis and fits to a positioning shaft provided on the main frame.

An image forming apparatus includes a processing unit, a main frame, a drive source, and a door-type positioning panel. The processing unit performs at least part of image formation. The main frame supports the processing unit such that the processing unit is pulled out or housed. The drive source is provided on the main frame and connected to a first end of a processing drive shaft of the processing unit to provide rotative power. The door-type positioning panel positions and supports a second end of the processing drive shaft by using an insert hole. An end of the door-type positioning panel is supported by the main frame such that the panel swings on a support axis. The door-type positioning panel includes a fit hole that is closer to a swinging end of the panel than to the support axis and fits to a positioning shaft provided on the main frame.

An image forming apparatus includes an apparatus body and a unit detachably mounted to the apparatus body and comprising a unit body, a cam, a first movement member, and a second movement member. The unit includes a first contact portion, an urging portion, and a second contact portion. The second movement member is attachable to the first movement member in a first manner or a second manner. A detection pattern of a detection signal differs between a state in which the second movement member is in contact with the first contact portion and a state in which the second movement member is in contact with the second contact portion, and differs between a state in which the second movement member is attached in the first manner and a state in which the second movement member is attached in the second manner.

An image forming apparatus including a consumable to be used for image formation. The image forming apparatus includes: a usage amount detector configured to detect a cumulative value of a usage amount of the consumable and a remaining amount of the consumable; a predictor configured to predict a period that allows use of the consumable based on the remaining amount detected by the usage amount detector; and a determination unit configured to generate a delivery request signal for prompting a delivery request for the consumable when the period that allows the use predicted by the predictor is smaller than a predetermined number-of-day threshold value. The image forming apparatus avoids performing processing for generating a delivery request signal by the determination unit after the start of the use of the image forming apparatus until a predetermined condition is satisfied.

An information processing apparatus that transmits a print job to an image forming apparatus configured to start print processing upon receiving a print job even in a state where a post-processing device corresponding to post-processing designated in the print job is not mounted on a post-processing apparatus. The information processing apparatus is configured to receive information about the post-processing device from the image forming apparatus, transmit based on the received information the print job to the image forming apparatus when determining that the post-processing device corresponding to the post-processing designated in the print job is mounted on the post-processing apparatus, and not to transmit the print job to the image forming apparatus when determining that the post-processing device corresponding to the post-processing designated in the print job is not mounted on the post-processing apparatus.