JPH0468041U - - Google Patents

Description

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a transfer sheet conveyance device in an image forming apparatus according to this invention, FIG. 2 is a simplified schematic configuration diagram showing the entire color copying machine equipped with the transfer sheet conveyance device, FIG. 4 is a schematic diagram showing the state in which the sheet leading edge regulating portion of the transfer sheet passage regulating member has been moved to a position where it allows the transfer sheet to pass, and the state in which it has been moved to a position where its leading edge is brought into contact and prevented from passing. ,
FIG. 5 shows the dimensional relationship of each part so that the transfer sheet passage regulating member clamps the transfer sheet between a pair of registration rollers and then moves the sheet leading end regulating member to a position where the transfer sheet is allowed to pass. The schematic diagrams, FIGS. 6 and 7, are used to explain the inconvenience when the sheet leading edge regulating section moves to a position that allows the transfer sheet to pass before the transfer sheet is held between the pair of registration rollers. 8 is an overall configuration diagram showing an embodiment in which the transfer sheet conveying device according to this invention is applied to different types of image forming apparatuses, and FIG. 9 is an explanatory diagram showing the different stages of transfer sheet conveyance. FIGS. 10 and 11 are perspective views for explaining that skew is likely to occur when the skew occurs. FIGS. FIG. 6...Gritzper, 12...Photosensitive drum, 17
...Transfer position, 20...Transfer sheet conveyance device, 2
6, 55... Registration roller pair, 27... Transfer sheet passage regulating member, 28, 37... Spring, 29...
...Solenoid (drive source), 33... Sheet tip regulating section, 34... Registration roller engaging section, 35, 3
9...Roller, 35a, 35b...Shaft portion, 40...
...Conveyance path, P...Transfer sheet.

Claims (1)

[Claims for Utility Model Registration] 1. Provided on the upstream side of conveyance of the transfer sheet from the transfer position where the image formed on the photoconductor is transferred to the transfer sheet in the image forming apparatus, and for aligning the transfer sheet with the image on the photoconductor. In a transfer sheet conveying device equipped with a pair of registration rollers that are conveyed at a predetermined timing, one roller of the pair of registration rollers is held so as to be able to be pressed against and separated from the other roller, and the roller is moved close to the pair of registration rollers. a transfer sheet passage regulating member in which the sheet leading edge regulating portion is movable between a position where the leading edge of the transfer sheet is brought into contact between the pair of registration rollers and the transfer position to prevent the sheet from passing, and a position where the leading edge of the transfer sheet is allowed to pass; is disposed, and one roller of the pair of registration rollers moves toward the other roller in conjunction with the movement of the sheet leading edge regulating portion of the transfer sheet passage regulating member between a position that blocks passage of the transfer sheet and a position that allows passage of the transfer sheet. 1. A transfer sheet conveying device for an image forming apparatus, characterized in that the transfer sheet is moved to a position where it is separated from the sheet and a position where it is pressed against the sheet. 2. The transfer sheet conveying device in the image forming apparatus according to claim 1, wherein a part of the transfer sheet passage regulating member is engaged with a shaft portion of one of the pair of registration rollers;
A transfer sheet conveying device in an image forming apparatus, characterized in that the transfer sheet passage regulating member is driven by a single drive source to cause the sheet leading end regulating portion and one roller of a pair of registration rollers to interlock with each other. . 3. In the transfer sheet conveyance device in an image forming apparatus according to claim 1 or 2, when the transfer sheet passage regulating member moves from a position where the sheet leading end regulating member prevents passage of the transfer sheet to a position where the transfer sheet is allowed to pass, the registration roller An image forming apparatus characterized in that, after one roller of the pair clamps the transfer sheet with the other roller, the sheet leading end regulating section moves to a position where the transfer sheet is allowed to pass. Transfer sheet conveyance device.