JPH01133462A - Picture forming device - Google Patents

Abstract

PURPOSE:To display a stable reading function by providing an interrupting means to thermally interrupt the heating source of a picture forming means and the reading part of a picture reading means. CONSTITUTION:A picture forming device 1 has a picture reading means 2 to build in a reading part 3 to execute the reading scanning of picture information stuck to an original and a picture forming means 4 with a laser beam supported in the condition to mount a picture forming means 2 on an upper surface. The travelling area in an enclosure 5 of the reading part 3 is formed, a bottom plate part 9A to draw the bottom surface side of the picture forming means is formed by a heat insulating material and thus, heat rollers 15A and 15B equipped with a fixing function which is the heating source of the picture forming means 4, and the reading part 3 are thermally interrupted.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to an image forming apparatus, and more specifically, an image reading means such as a scanner that reads image information attached to a document; The present invention relates to an image forming apparatus that is combined with an image forming means such as a printer that forms an image based on the image information read by the image reading means.

(Prior Art) Generally, in an image forming apparatus that combines an image reading means and an image forming means, the image reading means is generally disposed above the image forming means.

In such a configuration, the bottom plate of the image reading means faces near the heat roller as a heat generation source in the image forming means, and therefore the bottom plate of the image reading means is exposed to the heat generated by the heat roller. It is heated, and this heat is further transmitted to the sensor section of the reading section and the reading processing circuit in the image reading means.

As a result, there was a problem in that the characteristics of the sensor section changed, the electrical characteristics of the reading processing circuit changed, and when the reading section read image information, the effects of noise etc. occurred and prevented stable reading operations. .

(Problems to be Solved by the Invention) As described above, in the conventional apparatus, there is a problem in that the reading function of the image reading means cannot be properly performed due to the influence of heat from the image forming means.

SUMMARY OF THE INVENTION Therefore, it is an object of the present invention to provide an image forming apparatus that can eliminate the influence of heat from an image forming means and perform stable reading operations.

[Structure of the Invention] (Means for Solving the Problems) The present invention includes a document holding section that holds a document with image information attached thereto, and a reading section that performs reading scanning on the document held by the document holding section. and an image forming device that forms an image while generating heat based on the image information read by the reading section, wherein the image forming device has a heat generation source of the image forming device and a reading device of the image reading device. It is equipped with heat insulating means to thermally isolate the parts from each other.

(for production) The operation of the apparatus having the above configuration will be explained below.

With this device, when performing a reading operation on a document and performing an image forming operation, heat from the heat generation source of the image forming means is also transmitted to the image reading means.

At this time, the heat insulating means thermally isolates the heat generation source of the image forming means and the reading section of the image reading means, so the temperature rise in the reading section is almost eliminated and its reading function is performed normally. .

(Example) Examples of the present invention will be described in detail below.

The image forming apparatus 1 shown in FIG. 1 and FIG. It has an image forming means (laser beam printer) 4 using a laser beam that is supported in a mounted state.

The image forming means 2 includes a housing 5, a transparent glass document placement plate 6 horizontally disposed on the upper surface of the housing 5, and a side of the document placement plate 6, and A document conveyance means 7 provided inside the housing 5, and the reading section 3 which performs reading scanning on the document placed on the document placement plate 6 and the document conveyed by the document conveyance means 7, respectively. A first bottom plate part 9A, a second bottom plate part 9B, which are arranged separately, form a running area 9 in the housing 5 of the reading section 3 and define the bottom side of the image forming means 2, and the document placement plate 6. A platen cover 10 has a top surface covered and is connected to the housing 5 so as to be openable and closable, and has a predetermined inclination angle so that a document can be inserted into the document transport means 7 from the top surface when the cover is in an open state. Equipped with

The reading section 3 includes an exposure lamp 11 that illuminates the original placed on the original placing plate 6. 12. An optical system such as a Selfox lens that optically reads image information attached to a document. A sensor section 13 such as a CCD sensor that converts the read information imaged by the optical system 12 into an electrical signal. A reading circuit board 14 is built in to process the read information output from the sensor section 13 and send it to image forming means.

The first bottom plate portion 9A is made of a heat insulating material, and as shown in FIGS. 1 and 2, a heat roller 15 is provided with a fixing function, which is a heat source of the image forming means 4, which will be described later.
It is arranged at a position facing the vicinity of A and 15B. Further, the second bottom plate portion 9B is arranged at the same level as the first bottom plate portion 9A, and separated from the first bottom plate portion 9A with an interval of, for example, about 5M.

The reading unit 3 is driven and controlled by a driving means (not shown) so that the position shown in FIG. 1 is a normal stop position (home position), and thereby the heat roller 15A
, 15B is blocked by the first bottom plate portion 9A, so that there is almost no thermal influence on each element of the reading section 3 that is normally located at the stop position.

That is, the first bottom plate part 9A and the second bottom plate part 9B function as a heat insulating means for blocking heat from the heat rollers 15A and 15B.

The heat insulating means may include a band-shaped heat insulating member 16 made of a heat insulating material mounted between the bottom plate portions 9A and 98, as indicated by diagonal lines in FIGS. 1 and 2.

Further, when reading and scanning the original on the original placing plate 6, the reading unit 3 is driven by a driving means (not shown) into the first position.
When traveling in the traveling area 8 in the six directions shown by the arrows shown in the figure and scanning the original transported by the original transporting means 7, the driving means (not shown) moves the direction indicated by the arrow B.
The vehicle is configured to travel in a travel area 8 in the direction shown in FIG.

In this case, in the image forming apparatus 1 of this embodiment, the reading section 3 spends an overwhelming majority of the time in the normal stop position, including when the power is turned on.

Although not shown in FIGS. 1 and 2, the boundary between the first bottom plate part 9A and the second bottom plate part 9B, through which the reading part 3 passes, does not hinder the smooth running of the reading part 3. Needless to say, it is formed flat.

The image forming means 4 includes a case 22 and an image forming section 17.
, a fixing section 18 formed by the heat rollers 15A and 15B, a paper feed cassette 19 containing copy paper for supplying the copy paper as an image forming medium to the image forming section 17, and a paper ejection roller 2OA. 20B and paper output tray 2
1.

The image forming section 17 includes a laser light source 23 that emits a laser beam, the optical system 24 that performs optical modulation and writing scanning based on reading information output from the reading section 3 on the laser beam, and the optical system 24 that performs writing scanning on the laser beam. A photoconductor drum 25 receives a light-modulated laser beam from an optical system 24 and forms an image on the outer circumference according to the read information, and an image formed on the outer circumference of the photoconductor drum 25 is electronically generated. The image forming apparatus includes a transfer section 26 that transfers images onto copy paper using a photographic method.

The heat rollers 15A and 15B of the fixing unit 18 are heated to, for example, about 190° C. so that the fixing operation can always be performed when the power is turned on.

Next, the operation of the device having the above-mentioned configuration will be explained, mainly focusing on the function of the first bottom plate portion 9A, which is a heat insulating means.

When this device is powered on, the reading section 3 stops at the normal stop position shown in FIG.
5B is heated to about 190°C. By heating the heat rollers 15A and 15B to about 190° C., the heat from the heat rollers 15A and 15B reaches the first bottom plate portion 9A through the upper surface of the case 22, but the first bottom plate portion 9A is made of a heat insulating material. Moreover, since the first bottom plate part 9A and the second bottom plate part 9B are arranged separately, the temperature of the first bottom plate part 9B hardly increases due to the heat insulation function of the first bottom plate part 9A. As a result, the sensor section 13. of the reading section 3 which is normally located at the stop position. The heat from the heat rollers 15A and 15B is not transmitted to the reading circuit board 14 and the like, and changes in characteristics due to temperature increases can be prevented, and a stable reading function can be achieved.

The Kibatsu-uta is not limited to the above-mentioned embodiment, and various modifications can be made within the scope of the gist thereof.

For example, in the above-mentioned embodiments, a case has been described in which a heat insulating means consisting of the bottom plate of the image reading means is provided, but the entire bottom plate may be made of a heat insulating material, or the upper surface of the case of the image forming means may be made of a heat insulating material. This can also be done by

[Effects of the Invention] According to the present invention described in detail above, since the reading section of the image reading means is thermally isolated from the heat generation source of the image forming means by the heat insulating means, the temperature rise in the reading section is almost eliminated. , it is possible to provide an image forming apparatus that exhibits a stable reading function.

[Brief explanation of the drawing]

FIG. 1 is a schematic sectional view showing a device according to an embodiment of the present invention, and FIG. 2 is a schematic perspective view showing main parts of the device. 1... Image forming device, 2... Image reading means, 3...
・Reading section, 4... Image forming means, 9A... First bottom plate part forming heat insulating means, 9B... Second bottom plate part forming heat insulating means, 15A, 15B... As heat source heat roller.

Claims (2)

[Claims] (1) An image reading means having a document holding section that holds a document with image information attached thereto, and a reading section that scans the document held by the document holding section; In an image forming apparatus having an image forming means that forms an image while generating heat based on the image forming apparatus,
An image forming apparatus comprising: a heat insulating means for thermally insulating a heat source of the image forming means and a reading section of the image reading means. (2) The heat insulating means includes forming a first bottom plate portion near the heat generation source out of a heat insulating material among the bottom plate portions that define a running area of the image reading means facing the heat generation source of the image forming means, and the reading portion is 2. The image forming apparatus according to claim 1, wherein the second bottom plate part, which is present in large numbers, is arranged separately from the first bottom plate part.