JPS62178289A - Image forming device - Google Patents

Abstract

PURPOSE:To stably maintain the efficiency of heat reflection over a long period by forming a curved surface part on a base frame of an image forming device body so that the lower side of a fixing means is surrounded by the base frame and forming a heat reflection processing layer on the surface of the curved part. CONSTITUTION:A developer image formed on a photosensitive body in a copying device is transferred to paper P by a transfer device. Then, the paper P is peeled off the photosensitive body by a peeling off device and delivered to a fixing device 21 through a carrier line 18. The device 21 is constituted of a fixing means 33 consisting of a heat roller 31 to be an upper roller including a heater lamp 30 and a press roller 32 to be a lower roller rotationally contacted with the heat roller 31 and the heat reflection means 34 surrounding the lower side of the means 33. The means 34 is constituted by forming the curved surface part 35a on the synthetic resin-made base frame 35 of the copying device body so as to surround the lower side of the means 33 and forming the reflection processing layer 36 on the surface of the curved surface part 35a. Thus, heat reflection efficiency stable over a long period can be maintained without generating thermal deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Objective of the Invention 1 (Industrial Application Field) The present invention relates to an image forming apparatus such as an electronic copying machine, and particularly relates to a fixing means having a heat source and a lower surface of the fixing means. Improvement of an image forming apparatus having a fixing device that is equipped with a heat reflecting means surrounding the side and heats and fixes a developer image on an image support that passes through an image support transport path formed in an image forming apparatus main body. Regarding.

(Prior Art) Usually, in an image forming device such as a copying machine, there is a fixing means consisting of a heat roller, which is an upper row roller with a built-in heater lamp, and a pressure roller, which is a lower roller that rolls into contact with the heat roller, and this fixing means. An eight-fixing device is used, which is equipped with heat reflecting means surrounding the bottom side of the fixing device. However, the conventional heat reflecting means consists of a heat reflecting plate made of a curved sheet metal, and is configured to be fixed to the base frame of the main body of the image forming apparatus via a fixing device such as a screw.

(Problems to be solved by the invention) In this way, the conventional type requires a heat reflector and a fixture, which not only requires a large number of parts and a large number of assembly steps, but also requires a heat reflector made of sheet metal. Therefore, there is a problem that thermal deformation may occur and stable reflection efficiency cannot be obtained over a long period of time.

The present invention was made based on the above circumstances, and its purpose is to have a simple structure, reduce the number of parts and assembly man-hours, and provide stable reflection efficiency over a long period of time without deformation of the curved surface. An object of the present invention is to provide an image forming apparatus that can maintain a good fixing function.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above problems, the present invention includes a fixing means having a heat generation source and a heat reflecting means surrounding the lower surface side of the fixing means. and an image forming apparatus having a fixing device for heating and fixing a developer image on an image support passing through an image support transport path formed in an image forming apparatus main body, wherein the heat reflecting means is It is formed integrally with the base frame of the image forming apparatus main body so as to surround the lower surface side of the fixing means, and is composed of a curved surface portion whose surface is coated with a heat reflective treatment layer.

(Function) In other words, in the present invention, a curved surface portion is formed on the base frame of the main body of the image forming apparatus so as to surround the lower surface side of the fixing means, and a heat reflective treatment layer is applied to the surface of the curved surface portion to prevent heat. Since it is used as a reflection means, there is no need for an independent heat reflection plate or fixture, reducing the number of parts and assembly man-hours.Furthermore, it is possible to obtain stable reflection efficiency over a long period of time without deforming the curved surface. Become.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. FIG. 2 is a schematic vertical front view of a copying apparatus as an image forming apparatus, and its configuration is as follows.

In the figure, reference numeral 1 denotes a copying apparatus main body as an image forming apparatus main body.A document table 2 is provided on the top surface of the copying device main body 1 so as to be able to freely move back and forth, and an operation panel is provided on the front edge of the top surface. ing.

In addition, a paper feed cassette 3 is provided on the right side of the copy 8i main body 1.
A cassette cover 4 of the paper feed cassette 3 serves as a manual paper feed table 5 for manually feeding paper P as an image support.

A drum-shaped photoreceptor 6 is provided approximately at the center of the main body 1 of the copying apparatus, and a charging device 7 is provided around the drum-shaped photoreceptor 6. Exposure device 8. Developing device9. Transfer device 1o, peeling bag @11.
and cleaning device 12 are sequentially arranged.

Further, in the lower part of the main body 1 of the copying machine, paper P supplied from an automatic paper feeder 15 equipped with a paper cassette 3 and paper P supplied from a manual paper feed tray 5 are connected to the photoreceptor 6. A paper transport path 18 is formed as an image support transport path leading to a paper discharge tray 17 provided on the left side of the copying apparatus main body 1 via an image transfer section 16 between the image transfer device 10 and the copying apparatus main body 1 .

Further, an aligning roller pair 20 is arranged on the upstream side of the image transfer section 16 of the paper conveyance path 18, and a fixing bag @21 and a paper ejection roller pair 22 are arranged on the downstream side.

During the copying operation, the photoreceptor 6 is driven by a drive mechanism (not shown) in the direction of the arrow in the state shown in FIG. The exposure lamp 23 lights up. and,
First, the charging device 7 uniformly charges the document image, and the exposure device 8 forms an image of the document set on the document table 2 on the photoreceptor 6, thereby forming an electrostatic latent image thereof. Next, the electrostatic latent image on the photoreceptor 6 is sent as a developer image to the transfer device 10 side by a developing device 9 that uses a two-component developer consisting of toner a and carrier b.

On the other hand, the automatically or manually fed paper ff1P is fed via a pair of aligning rollers 20, and the developer image previously formed on the photoreceptor 6 is transferred onto the paper P by the action of the transfer device 10. Next, the paper P is separated into a release bag fa! by AC corona discharge. 11, it is peeled off from the photoreceptor 6, passes through a conveyance path 18, and is sent to a fixing device. Here, the developer image is used M P1. : The fused and fixed bond is discharged onto the paper discharge tray 17 by the paper discharge roller pair 22.

Note that after the developer image is transferred onto the paper P, the residual toner remaining on the photoreceptor 6 is cleaned by the cleaning device 12, and the next copying operation is ready.

Further, the fixing device 21 has a structure as shown in detail in FIG.

That is, this fixing device 21 includes a heat roller 3 that is an upper roller that has a built-in heater lamp 30 that is a heat generation source.
1 and a pressure roller 3 which is a lower roller in rolling contact therewith.
The fixing means 33 includes a heat reflecting means 34 that surrounds the lower surface side of the fixing means 33.

The heat reflecting means 34 has a curved surface portion 35a formed on the synthetic resin base frame 35 of the copying apparatus main body 1 so as to surround the lower surface side of the fixing means 33.
It is constructed by applying a reflective treatment layer 36 to the surface of a.

The reflective treatment layer 36 is formed, for example, by painting or plating a reflective material, or by pasting silver paper or the like.

In the figure, 37 is a thermistor that measures the temperature of the heat roller 31, 38 is a cleaning blade that cleans (suspends) the surface of the heat roller 31, 39 is a separation claw that separates the paper P from the heat roller 31, and 40 is a fixing means 33. A paper ejection switch 41 detects the paper P ejected from the fixing means 33, and a paper ejection switch 41 detects the paper P to which the developer image has been transferred.
This is a guide plate that guides between the roller 31 and the pressure roller 32.

Further, reference numeral 42 denotes a cover surrounding the upper part of the fixing means 33, and heating 43 is formed by this cover 42 and the heat reflecting means 34 surrounding the lower part of the fixing means 33.

Thus, the paper P onto which the developer image has been transferred is transferred to the fixing device 21.
The heat roller 3 is conveyed to the side, and the leading edge of the paper P is driven via a drive system (not shown) via a guide plate 41.
1 and the pressure roller 32, and are conveyed while being held therebetween. At this time, since both the rollers 31 and 32 are heated and in contact with each other with a predetermined pressure, the developer image on the paper P is fixed to the paper P by heat/pressure. Thereafter, the paper is delivered to the pair of paper discharge rollers 22.

On the other hand, the heat radiated downward from the fixing means 33 is reflected by the heat reflecting means 34 and is prevented from being transmitted to the base frame 35 etc., and the inside of the heating v43 is always kept at a good atmospheric temperature. There is.

The heat reflecting means 34 has a reflective treatment layer 36 applied to the surface of a curved surface 35a directly formed by the base frame 35 of the copying apparatus main body 1, and is different from the conventional curved sheet metal heat reflecting plate. As such, there is no risk of thermal deformation and stable reflection efficiency can be obtained over a long period of time.
There are fewer parts and fewer assembly steps.

[Effects of the Invention] As explained above, the present invention includes a fixing means having a heat generation source and a heat reflecting means surrounding the lower surface side of the fixing means, and an image support formed in the main body of an image forming apparatus. The image forming apparatus includes a fixing device that heats and fixes a developer image on an image support body passing through a body conveyance path, the heat reflecting means being integral with a base frame of the image forming apparatus body and fixing the developer image on the image support body passing through a body conveyance path. It consists of a curved surface portion that is formed so as to surround the lower surface side of the means and has a heat reflecting layer applied to the surface. Therefore, it is possible to provide an image forming apparatus that has a simple configuration, requires less parts and assembly man-hours, has no deformation of the curved surface, has a stable reflection efficiency of 1q over a long period of time, and can maintain a good fixing function. It produces such effects.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, and FIG. 1 is a schematic longitudinal sectional front view of the main parts, and FIG. 2 is a schematic longitudinal sectional front view of the image forming apparatus. 1... Image forming apparatus main body (copying apparatus main body), 18...
- Image support conveyance path (paper conveyance path), 21...Fixing device, 30...Heating source (heater lamp), 31...Heat roller, 32...Press roller, 33...Fixing means , 34... Heat reflecting means, 35... Base frame,
35a...Curved surface portion, 36...Reflection treatment layer.

Claims (2)

[Claims] (1) Development on an image support that is equipped with a fixing means having a heat source and a heat reflection means surrounding the lower surface side of the fixing means, and that passes through an image support transport path formed in the main body of the image forming apparatus. An image forming apparatus having a fixing device that heats and fixes a toner image, wherein the heat reflecting means is formed integrally with a base frame of the image forming apparatus main body and surrounding a lower surface side of the fixing means. An image forming apparatus comprising: a curved surface portion having a heat reflective treatment layer applied to the surface thereof; (2) The image forming apparatus according to claim 1, wherein the base frame is made of synthetic resin.