JPS6333706B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a release agent coating device that has an improved mounting structure for a coating member that applies a release agent using a fixing roll in a copying machine that employs a heat fixing method.

Conventionally, in this type of copying machine, a release agent is applied to the fixing roll using a felt-like application member in order to prevent the toner image transferred to the paper from being offset to the fixing roll. However, as shown in Fig. 1, the conventional applicator c is screwed to the support a with a fixing device b, which makes it troublesome to replace if it gets dirty, and the part that contacts the fixing roll gets dirty. This has disadvantages such as being uneconomical because it is difficult to reuse.

This invention was made with the aim of eliminating such drawbacks, and it is possible to easily attach and detach the applicator to the support, and even if the contact part with the fixing roll becomes soiled, the copying member can be reused by changing the position. The purpose of this invention is to provide a release agent coating device for a machine, thereby facilitating replacement work and extending the life of the coating member.

An embodiment of the present invention will be described below in detail with reference to an embodiment shown in FIG. The fixing roll 1 is heated to a high temperature, and a pressure roll 2 is pressed against the surface of the fixing roll 1 .
Reference numeral 3 designates the main body of this device, which has a felt-like applicator member 5 whose lower end side is immersed in a mold release agent tank 4. The upper end side of this applicator member 5 is bent into a substantially dogleg shape. One end is pressed against the surface of the fixing roll 1, and the other end is attached to an attachment member 7 supported by a support 6. Support 6
Both ends of the support 6 are attached to a copying machine frame (not shown), and the attachment member 7 attached to the horizontal portion 6a of the support 6 has a substantially U-shaped cross section using a plate spring or the like. One side of the mounting member 7 is inclined low toward the fixing roll 1 side, and a large number of locking protrusions 7a are cut and raised on the upper surface at intervals in the longitudinal direction.
The back surface of the upper end side of the application member 5 is locked to a to prevent it from shifting toward the fixing roll 1 side.

Further, a cleaning blade 8 is provided above the coating member 5 so as to insert the coating member 5 between it and the mounting member 7. This cleaning blade 8 cleans the surface of the fixing roll 1, and at the same time prevents the application member 5 from slipping out above the locking projection 7a.

Note that it is of course possible to prevent the application member 5 from slipping out upwards by using other slip-off prevention members instead of the cleaning blade 8. Further, reference numeral 9 in the figure is a blade that regulates the amount of release agent applied to the fixing roll 1 to be constant.

As described in detail above, this invention provides a large number of locking protrusions 7a on the mounting member 7, and the locking protrusions 7a
Since the applicator member 5 is locked in place, it is easier to install and remove the applicator member 5 compared to the conventional fixing device, which makes it possible to replace the applicator member 5 in a short time and efficiently. Fixing roll 1
If the contact area with the fixing roll 1 becomes contaminated, it can be reused by simply pulling out one end of the coating member 5 and changing the contact position with the fixing roll 1, making it extremely economical compared to conventional systems that had to be replaced only once. It is true. Moreover, if the attachment member 7 is formed of a leaf spring or the like, the application member 5 can be evenly pressed against the fixing roll 1 due to its elasticity, so that the release agent can be evenly applied to the fixing roll 1.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a conventional coating device, FIG. 2 is a perspective view showing an embodiment of the present invention, FIG. 3 is a side view, and FIG. 4 is a perspective view of a mounting member. 1 is a fixing roll, 5 is an application member, 7 is a mounting member, and 7a is a locking protrusion.

Claims (1)

[Claims] 1. One end side of the coating member 5 that applies a release agent to the surface of the fixing roll 1 can be freely engaged and detached from the locking protrusion 7a of the mounting member 7, which has a large number of locking protrusions 7a in the axial direction of the fixing roll 1. A release agent applicator for a copying machine that is fixed to a .