JP3217159B2 - Transfer paper separation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer paper separating apparatus for separating transfer paper adhered to an image carrier from an image carrier when a toner image is transferred in an electrophotographic image forming apparatus. It is about.

[0002]

2. Description of the Related Art Conventionally, various transfer paper separating apparatuses for separating transfer paper on which a toner image has been transferred from an image carrier have been proposed. For example, a two-layer structure of an insulator and a conductor, in which a separation assisting member having a neutralization brush is provided or an auxiliary electrode for more effectively performing separation in addition to a neutralization electrode of transfer paper is provided. is there. These are all intended to separate the transfer paper using the curvature of the image carrier.

[0003]

However, in the above-described conventional transfer paper separating apparatus, the use environment is not always the same, and if the temperature and humidity are different or the type of transfer paper is different, Poor separation may occur. If this separation failure occurs, a paper jam (jam) may occur,
There has been a problem that an abnormal image is generated because the transfer paper rubs against another member facing the transport path. Therefore,
An object of the present invention is to provide a transfer paper separating apparatus which can solve the conventional problems described above and can always perform good transfer paper separation even when the use environment and the type of transfer paper are different. It is an issue.

[0004]

SUMMARY OF THE INVENTION The gist of the present invention is to provide a static elimination member for removing charge from a transfer sheet in order to separate transfer sheet adhered to an image carrier by a transfer operation. In a transfer paper separating apparatus for separating transfer paper according to a curvature of a body, the charge removing member is provided between the transfer paper separated from the image carrier and the image carrier after the transfer operation.
Transfer paper with poor separability separated from the image carrier
There to be provided in the position where neutralizing effect is increased about.

[0005]

Therefore, when the transfer paper adhered to the image carrier is separated by the curvature of the image carrier by the transfer operation, if the separability is poor, the transfer paper is bent toward the neutralizing member so as to approach the same. . At this time, since the charge of the transfer paper is eliminated by the neutralizing member, the separability is enhanced, the bending of the transfer paper returns, and the transfer paper is transported along a normal transport path.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a waste toner container 2 is provided in proximity to a belt-shaped photoreceptor 1 serving as an image carrier, and a transfer path 5 for transfer paper in which a transfer charger 3 and a registration roller 4 are disposed on the lower surface side. At the lower surface of the toner container 2, that is, at a position between the separated transfer paper and the belt-shaped photoreceptor 1, a charge elimination brush 6, which is a charge elimination member for removing electric charge of the transfer paper, is attached. Place and transport guide plate 7
However, a fixing roller 8 is disposed at a rear end position of the transport guide plate 7. In this configuration, after the transfer paper adheres to the belt-shaped photoreceptor 1 and the toner image is transferred by the transfer charger 3, if the separability is poor, as shown in FIG. (The arrow indicates the path of the transfer paper), and the closer it is, the greater the charge removal effect that removes the charge on the transfer paper.
Separability also improves. As a result, the bend returns due to the strength of the transfer paper, and returns to a path close to the regular transport path along the transport guide plate 7. If the static elimination brush 6 is not provided, as shown in FIG. 3, if the transfer paper has poor separability, the transfer paper advances so as to contact the bottom surface of the waste toner container 2. Is more likely to occur.

Further, as shown in FIG. 4, when the charge removing brush 6 is provided below the transfer path near the transfer charger 3, when the transfer paper has poor separation, the charge removing brush 6 is moved away from the charge removing brush 6 instead. , The separation property cannot be increased. Therefore, if the setting is made to enhance the static elimination effect, the effect is obtained when the separability is somewhat poor (arrow a), but excessive static elimination is performed at normal times when the separability is not bad, so that it does not follow the transport guide plate 7 on the contrary. (Arrow b), the transportability may be deteriorated. But,
In the above-described embodiment (where the charge removing brush 6 is provided on the lower surface of the waste toner container 2), the charge removing brush 6
Since the distance between the transfer sheet and the transfer sheet is relatively large, the charge is not excessively removed, and the transfer path of the transfer sheet along the transfer guide plate 7 is maintained.

Further, another embodiment will be described. In FIG. 5, a static elimination brush 6 is fixed to a side surface of the waste toner container 2 facing the belt-shaped photoreceptor 1, and the other portions have the same configuration as in the above-described embodiment. Also in this configuration, the separation property of the transfer paper has the same operation and effect as the above embodiment. Further, instead of the belt-shaped photoconductor 1, a photoconductor drum 9 is used.
FIG. 6 shows an embodiment in the case of an image forming apparatus using the image forming apparatus. In FIG. 1, the transfer path of the transfer paper is a photosensitive drum 9.
, The distance between the transfer unit including the transfer charger 3 and the fixing device including the fixing roller 8 is relatively short, and the discharging brush 6 is disposed on the transport path behind the transfer unit on the transport path. , At a position close to the photosensitive drum 9.

In this configuration, after the transfer paper has adhered to the photosensitive drum 9 and the toner image has been transferred by the transfer charger 3, if the separation property is poor, the transfer paper is moved in the direction of the charge removing brush 6 to the toner. When approaching, the static elimination effect is increased and the separability is improved. Therefore, the transfer paper returns to the regular conveyance path depending on the strength of the transfer paper, and proceeds toward the fixing device. If the transfer paper separating device has a separating claw, a configuration in which a neutralizing brush is provided on the shaft of the separating claw may be employed.

[0010]

As described above, the image forming apparatus is provided between the image bearing member and the transfer paper in which the charge removing member is separated from the image bearing member.
Transfer paper with poor separability separated from the carrier has a more effective neutralization effect.
Since there is provided the raised position, neutralization effect when poor separation of the transfer sheet is high can increase the isolation, and charge removing effect when the isolation is usually low, because it does not adversely affect the transport properties Regardless of the environment and the type of transfer paper, good separation can always be performed. In addition, since the separability is improved, it is possible to prevent an abnormal image due to paper jam or rubbing.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing a transfer paper separating apparatus according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the operation of the separation device of the present invention.

FIG. 3 is an explanatory diagram illustrating an operation of a transfer sheet when a charge removing member is not attached.

FIG. 4 is a schematic configuration diagram illustrating a separation device in which a static elimination member is provided below a transport path.

FIG. 5 is a schematic configuration diagram showing another embodiment in which the arrangement of the charge removing member is changed.

FIG. 6 is a schematic configuration diagram of a separation device showing an embodiment when an image carrier is a photosensitive drum.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Image carrier 6 Static elimination member

Claims (1)

(57) [Claims] A transfer member that removes a charge of the transfer sheet to separate the transfer sheet attached to the image carrier by a transfer operation, and separates the transfer sheet based on a curvature of the image carrier. In the apparatus, the static elimination member is located between a transfer sheet separated from the image carrier after the transfer operation and the image carrier ,
A transfer paper separating device, wherein the transfer paper separated from the transfer paper having a poorer separation property is provided at a position where the static elimination effect increases .