Image forming device

Abstract

The invention provides an image forming device, which enables heated air of an IU peripheral space (19) to pass through and be discharged from an air supply path (82) of a transverse conveying path (39) and a circulation path (58). When a conveyed paper (S) of the circulation path (58) are conveyed to a timing roller (35), the paper (S) is contemporarily stopped in the circulation path (58) according to the correct time of conveying paper (S) to the timing roller (35). When the temperature of the IU peripheral space (19) is lower than a regulated value, the paper (S) is contemporarily stopped, and thereby the front end of the paper (S) is placed at a first position (X1). When the temperature of the IU peripheral space (19) is higher than a regulated value, the paper (S) is contemporarily stopped, and thereby the front end of the paper (S) is placed at a second position (X2), and the air supply path (82) cannot be blocked by the paper (S) which is contemporarily stopped.

Description

technical field [0001] The present invention relates to an image forming apparatus having a function of forming an image on a first surface and a second surface of a sheet. Background technique [0002] As a conventional electrophotographic image forming apparatus, there are Figure 22 An image forming apparatus configured as shown. [0003] Figure 22 It is a diagram showing a schematic configuration of a tandem color printer, which has a double-sided printing function for forming a color image on the first side and the second side of paper. The following operations are performed in double-sided printing. [0004] That is, image forming units (IU) 901Y to 901K for Y (yellow), M (magenta), C (cyan), and K (black) are formed on photosensitive drums 911Y to 911K by developing parts 912Y to 912K. The electrostatic latent image is developed with toner. [0005] The toner images developed on the photosensitive drums 911Y to 911K are multi-transferred onto the intermediate tran...

AI Technical Summary

Problems solved by technology

[0016] According to this standby control, although the paper S1 and S2 can be avoided from colliding on the conveyance path 931, the following problem arises: from the aspect of shortening the length of the circulation path 951 due to the demand for miniaturization of the device, if the paper S1 Standby within 951, the rear end of the paper S1 blocks the air supply path 961, and the air supply path 961 is blocked

Even if the feeding timing of the paper S2 is delayed in this way, if the paper S1 is waiting in the circulation path 951, the situation that the air supply path 961 is blocked by the paper S1 cannot be changed, and the temperature rise of the IU cannot be suppressed.

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