JPS6312355Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention provides a peeling belt that is provided in contact with the vicinity of the end of an image carrier in an image forming apparatus of an electrophotographic copying machine, for example, and that guides the end of the transfer material away from the image carrier. The present invention relates to an apparatus having a cleaning blade for removing residual toner on an image bearing member.

An explanation will be given below using an electrophotographic copying machine as an example.

A conventional peeling device will be explained with reference to FIGS. 1 and 2.

The photosensitive drum 1 is rotated around a drum shaft 2 in the direction of the arrow by a drive device (not shown). The thin peeling belt 3 is fixed at one end by hanging around a fixed shaft 4, and the other end is provided with a spring 5 and stretched so as to be in contact with the circumferential surface of the photosensitive drum 1. A peeling roller 7 is disposed on the downstream side of the transfer charging device 6 in close proximity to the photosensitive drum 1 with respect to the traveling direction of the transfer paper, and is driven by a drive device (not shown) to maintain a speed equal to the transfer paper feeding speed of the photosensitive drum 1. It rotates to convey the transfer paper at a circumferential speed. The circumferential surface of the peeling roller 7 is made of a material with a large coefficient of friction, such as rubber. Furthermore, a peeling roller 8 is pressed onto the circumferential surface of the peeling roller 7.
It rotates according to the

In a copying machine using such a peeling device, after a charging/exposure process is performed by a well-known means (not shown), a magnetic sleeve 15 is provided as a developing device, for example, and magnetic toner is deposited on the outer periphery of the magnetic sleeve. By attracting the toner and applying the toner onto the electrostatic latent image on the photosensitive drum 1, the toner image formed on the photosensitive drum 1 is moved along the guide plates 12 and 13 by a pair of conveyance rollers 10 and 11. The transfer charger 6 performs the transfer onto the transferred paper. At this time, one side edge of the transfer paper is placed on the peeling belt 3 and the photosensitive drum 1 is
It can be attached tightly to the top. After that, the side edges of the transfer paper are
The photosensitive drum 1 is peeled off along the peeling belt 3 in a direction away from the circumferential surface of the photosensitive drum 1, and is fed out while being sandwiched between the circumferential surface of the peeling roller 7 and the peeling roller 8. and,
The cleaning blade 14 removes residual toner from the surface of the photosensitive drum 1 from which the transfer paper has been peeled off.

By the way, normally, in order to improve the accuracy of the gap between the outer circumference of the magnetic sleeve 15 and the outer circumferential surface of the photosensitive drum 1, rollers 16 whose outer diameter is increased by a predetermined gap distance are provided at both ends of the sleeve. The configuration is such that it is brought into contact with the top.

In this case, the two contact rollers 16 provided at both ends of the sleeve are provided at positions corresponding to non-image areas on the photosensitive drum 1.

However, although the blade 14 as a cleaning device is set to a length that sufficiently covers the image area, toner tends to adhere to the blade surface during scraping, and a small amount of toner often adheres to the blade surface from both ends of the blade. Toner may leak and adhere to the surface of the photosensitive drum in the form of thin streaks.

Therefore, when the photosensitive drum abutting rollers 16 are provided at both ends of the developing sleeve 15 as described above, when the toner is sandwiched between the abutting rollers 16 and the photosensitive drum 1, the surface of the photosensitive drum 1 is This may cause damage or problems such as the gap width not being accurate.
It is necessary to prevent streaks of toner leaking from the blade end 14a from coming into contact with this abutting roller 16.

Therefore, for example, in the magnetic sleeve 15, the cleaning blade end 14a is disposed between the magnetized image area end 15a and the inner end 16a of the abutting roller 16.

However, when an electrophotographic copying machine and a peeling belt configured in this manner are used, the end portion 14a of the cleaning blade may overlap the position of the peeling belt 3 in order to reduce the size of the transfer machine.

Therefore, since the peeling belt is lightly pressed onto the outer circumferential surface of the photosensitive drum, streaks of toner leaking from both ends of the cleaning blade will adhere to the peeling belt, and may damage or damage the outer circumferential surface of the photosensitive drum. There is a risk of damaging the peeling belt and shortening the life of the parts.

Therefore, the present invention aims to reduce the size of the image forming apparatus by reducing the size of the cleaning blade end 14.
Even if a overlaps the position of the separation belt, the toner leaking from the edge of the blade will not adhere to the separation belt and will not damage the outer peripheral surface of the photosensitive drum or the separation belt. This increases the durability of these parts.

That is, the present invention that achieves the above object is provided with a transfer material side end portion that is provided near the end of the image carrier in contact with the image carrier along the moving direction of the image carrier, and for peeling the transfer material from the image carrier. The image forming apparatus includes a peeling belt for guiding the toner away from the image bearing member, and a cleaning blade for removing residual toner on the image bearing member, the peeling belt moving in the direction of movement of the image bearing member. The notch portion is located at a position that overlaps with the end of the cleaning blade when viewed from above, contacts the image carrier, and has a notch portion at a portion corresponding to the outside of the image area.

An embodiment of the present invention will be described below with reference to FIG. FIG. 3 is a perspective view showing essential parts of an embodiment of the present invention. In the figure, 17 is a peeling belt using an embodiment of the present invention, and a cutout 17a
is provided. This notch 17a is provided over the portion where the belt 17 contacts the drum 1 in the direction of rotation of the drum 1, and is provided over the portion where the belt 17 contacts the drum 1.
In the width direction, the cleaning blade 14a
It is provided at a position corresponding to that of the end portion. Therefore, even if the toner leaking from the blade end 14a forms streaks 18 and remains on the circumferential surface of the drum 1 as shown in the figure, the residual toner 18 does not adhere to the belt 17 and flows through the notch 17a. pass through the area of Therefore, it is possible to prevent damage to the circumferential surface of the drum 1 or the peeling belt 17, thereby increasing the durability of these parts. Furthermore, by cutting the peeling belt to an appropriate width, it is possible to prevent the belt from deteriorating due to rubbing against the surface of the drum 1 without reducing the strength of the peeling belt. can increase the durability of

In the above embodiment, the positional relationship between the cleaning blade, the developing sleeve, and the peeling belt has been described using examples, but the present invention is not limited to these examples.

[Brief explanation of drawings]

FIG. 1 is a side view of a conventional peeling device, FIG. 2 is a perspective view of a conventional peeling device, and FIG. 3 is a perspective view of a peeling device using an embodiment of the present invention. In the figure, 1...photosensitive drum, 3...separation belt, 7...
Peeling roller, 8... Peeling roller, 14... Cleaning blade, 14a... Cleaning blade end, 15... Magnetic sleeve (developing sleeve), 16... Contact roller, 17... Peeling belt,
17a... Notch.

Claims (1)

[Claims for Utility Model Registration] A device is provided near the end of the image carrier so as to be in contact with the image carrier along the moving direction of the image carrier, and the side edge of the transfer material is image-bearing in order to peel the transfer material from the image carrier. In an image forming apparatus that includes a peeling belt for guiding the image carrier away from the body and a cleaning blade for removing residual toner on the image carrier, the peeling belt is attached to the end of the cleaning blade when viewed in the moving direction of the image carrier. Located in a position that overlaps with
An image forming apparatus characterized by having a notch in a portion that contacts the image carrier and corresponds to the outside of the image area.