JPH11208062A - Image forming device - Google Patents

Abstract

[PROBLEMS] To provide an image capable of providing a transparent sheet having a color-developing property even when used with an OHP or the like, which can prevent scattering of light due to the elimination of minute irregularities on the surface of a toner-attached portion of the transparent sheet. A forming device. In response to a request to print an image on a transparent sheet, a transparent sheet is transported from a first sheet supply unit to a printing unit, where the transparent sheet is subjected to print processing and transported. Further, at the timing of completion of fixing in the printing unit 2, the sheet is transported from the second sheet supply unit 4 in a state where the protective sheet is peeled off by the protective sheet peeling unit 4c,
After adjustment by the sheet edge adjusting means 5, the sheet synthesizing roller 6
Then, the printing surface of the transparent sheet is combined with the surface of the second transparent sheet having the adhesive layer, and the paper is pressed by the pressure roller 7 and discharged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus for performing a printing process in accordance with print image data input from the outside, and more particularly, to a transparent sheet used in an OHP or the like, wherein toner is applied to the transparent sheet. The present invention relates to an image forming apparatus that performs a printing process by fixing toner after being placed.

[0002]

2. Description of the Related Art Conventionally, a laser is scanned on a photosensitive member formed by a drum or a belt based on print image data input from the outside to form an electrostatic latent image, and the latent image is developed on the photosensitive member with toner. Copiers and laser beam printers are image forming devices that transfer toner from a photoconductor onto a sheet (paper, etc.) and heat and press the sheet to melt and fix the toner. Besides, a transparent sheet used for an OHP (overhead projector) can be printed.

[0003]

However, in the conventional image forming apparatus, when printing on a transparent sheet, a lot of fine irregularities are formed on the surface of the toner adhering portion due to insufficient melting of the toner and the like, and light is generated. When the transparent sheet is used with OHP or the like, there is a problem that the color developing property is remarkably reduced.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and has been made in consideration of the above-described problem, and an image forming apparatus having a printing unit for performing a printing process on a transparent sheet supplied from a sheet supplying unit is provided. A second sheet supply means for supplying a second transparent sheet having an adhesive layer to the sheet, a sheet synthesizing means for combining the two conveyed sheets, and simultaneously conveying the transparent sheet printed by the printing means. This is an image forming apparatus in which a second transparent sheet is transported from a second sheet supply unit, and a printing surface of the transparent sheet and a surface of the second transparent sheet having an adhesive layer are bonded by a sheet combining unit.

[0005] By bonding the printed surface of the transparent sheet and the surface of the second transparent sheet having the adhesive layer in this manner, the unevenness of the printed surface of the transparent sheet due to the toner is smoothed by the adhesive layer of the second transparent sheet. Be transformed into

Further, the image forming apparatus is provided with a pressurizing means for applying pressure to the bonded sheets and / or a heating means for heating the downstream side of the sheet synthesizing means.

[0007] With such a configuration, the adhesion between the two sheets can be further improved.

Further, the second sheet supply means includes a sheet storage cassette for storing a sheet in which a peelable protective sheet is adhered to the surface of the second transparent sheet having the adhesive layer.
The image forming apparatus is provided with a protective sheet peeling unit for peeling off the protective sheet of the sheet supplied from the sheet storage cassette, and a protective sheet storage cassette for storing the peeled protective sheet.

With such a configuration, the adhesive layer of the second transparent sheet is prevented from being dried or stained, or is prevented from adhering to unnecessary portions during supply.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic diagram illustrating the configuration of an image forming apparatus according to the present invention. The image forming apparatus 1 includes a printing unit 2, a first sheet supply unit 3, a second sheet supply unit 4, a sheet edge adjustment unit 5, and a sheet. It comprises a synthesizing roller 6, a pressure roller 7, and a paper discharge tray 8.

In the present embodiment, the printing means 2 is a schematic configuration diagram using a laser beam printer as an example, and a laser light source 2a which emits input print image data as an optical signal,
A plurality of lens systems 2b, a polygon mirror 2c, a charger 2
d, a photoreceptor drum 2e, a plurality of developing devices 2f for each color, a transfer drum 2g, a fixing device 2h including a heating roller and a pressure roller, and a transparent sheet supplied from the first sheet supply means 3 is used as a conventional image. The printing process is performed in the same manner as in the forming apparatus, and the sheet is supplied to the sheet synthesizing roller 6.

The first sheet supply means 3 comprises a tray 3a for storing transparent sheets, a supply roller 3b, and the like, and supplies the transparent sheets to the printing means 2.

The sheet stored in the tray 4a of the second sheet supply means 4 is a second transparent sheet having an adhesive layer having transparent glue or the like adhered to one side, and a protective sheet (such as a film) is provided on the surface of the adhesive layer. Is included).
As described above, since the protective sheet is stuck, the adhesive device can be prevented from adhering to other mechanisms in the tray 4a or while the sheet is being supplied. Can be prevented. The protective sheet has a supply roller 4b, a protection sheet peeling means 4c, and a protection sheet collection tray 4d. The protection sheet is peeled off from the second transparent sheet by the protection sheet peeling means 4c. The protection sheet thus conveyed is transported to the protection sheet collection tray 4d, and the second transparent sheet is supplied to the sheet synthesizing roller 6.

The sheet edge adjusting means 5 includes a sheet synthesizing roller 6 for overlapping the edges of the transparent sheet conveyed from the printing means 2 and the second transparent sheet conveyed from the second sheet supply means 4 so as to overlap each other. This is a means for adjusting the start of supply to the container.

The sheet synthesizing roller 6 synthesizes the transparent sheet conveyed from the printing means 2 and the second transparent sheet conveyed from the second sheet supply means 4.

The pressing roller 7 presses the sheet synthesized by the sheet synthesizing roller 6 to bring the sheet into close contact.

The paper discharge tray 8 is a tray for storing sheets conveyed from the pressure roller 7.

Next, the operation of the above configuration will be described. In response to a request to print an image on the transparent sheet, the transparent sheet is transported from the first sheet supply unit 3 to the printing unit 2, where the transparent sheet is subjected to print processing and transported. Further, at the timing of completion of fixing by the printing means 2, the sheet is conveyed from the second sheet supply means 4 with the protective sheet peeled off by the protective sheet peeling means 4 c, adjusted by the sheet edge adjusting means 5, and then adjusted by the sheet combining roller 6 The printing surface of the transparent sheet is combined with the surface of the second transparent sheet having the adhesive layer, and the paper is pressed by a pressure roller 7 and discharged.

By synthesizing the printing surface of the transparent sheet and the surface of the second transparent sheet having the adhesive layer as in the present invention, fine irregularities formed in the toner-fixed portion of the transparent sheet are reduced. Since the unevenness is smoothed by filling the transparent sheet 2 with the adhesive layer, the scattering of light due to the unevenness is reduced, and the color developability when projected as a transparent image by OHP or the like is improved. Further, since the toner is not formed directly on the surface, the durability against peeling, aging, and contamination of the toner is improved. Further, even if the transparent sheet is made thinner, the strength is maintained because it is combined with the second transparent sheet, and the heat capacity is reduced because the transparent sheet is made thinner. As a result, the density fluctuation is reduced, the toner is easily melted, the fixability is improved, and the color developability is improved.

In this embodiment, the case where the protective sheet peeling means 4c and the protective sheet collecting tray 4d are provided has been described. However, without providing these, the adhesive layer is adhered to the transparent sheet by pressing or heating. A second transparent sheet made of a material is stored in the tray 4a, and is adhered at the time of passing through a pressure roller 7 as a pressing means, or a heating roller as a heating means is provided downstream of the sheet synthesizing roller 6 to heat the sheet. Both sheets can be adhered together by sticking at the time of passage of the roller or by providing a pressing unit and a heating unit downstream of the sheet synthesizing roller 6 and sticking them at the point of passage as in the fixing device 2h. It may be.

[0021]

As described above in detail, according to the image forming apparatus of the present invention, the printing surface of the transparent sheet and the surface of the second transparent sheet having the adhesive layer are bonded by the sheet synthesizing means. , Light can be prevented from being scattered due to the elimination of minute irregularities on the surface of the toner adhering portion of the transparent sheet,
An image forming apparatus that can provide a transparent sheet having a coloring property even when used with an OHP or the like.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram illustrating an image forming apparatus of the present invention.

[Explanation of symbols]

 1: Image forming apparatus 2: Printing unit 2a: Laser light source 2b: Lens system 2c: Polygon mirror 2d: Charger 2e: Photoconductor drum 2f: Developing unit 2g: Transfer drum 2h: Fixing unit 3: First sheet supply unit 3a : Tray 3b: Supply roller 4: Second sheet supply means 4a: Tray 4b: Supply roller 4c: Protective sheet peeling means 4d: Protective sheet collection tray 5: Sheet edge adjusting means 6: Sheet synthesizing roller 7: Pressure roller 8: Output tray

Claims (3)

[Claims] 1. An image forming apparatus comprising: printing means for placing a toner on a transparent sheet supplied from a sheet supply means, fixing the toner, and performing a printing process.
The second for supplying a second transparent sheet having an adhesive layer on one side
And a sheet synthesizing means for combining the two conveyed sheets, and simultaneously conveying the transparent sheet printed by the printing means, and simultaneously outputting the second transparent sheet from the second sheet supplying means. An image forming apparatus, wherein the sheet is conveyed and the printed surface of the transparent sheet is bonded to the surface of the second transparent sheet having an adhesive layer by the sheet synthesizing means. 2. The image forming apparatus according to claim 1, further comprising a pressurizing unit for applying pressure to the bonded sheets and / or a heating unit for heating the bonded sheets, on a downstream side of the sheet combining unit. 3. A sheet storing cassette for storing a sheet in which a peelable protective sheet is attached to a surface of the second transparent sheet having an adhesive layer, the sheet being supplied from the sheet storing cassette. 2. The image forming apparatus according to claim 1, further comprising a protection sheet peeling unit that peels off the protection sheet of the sheet, and a protection sheet storage cassette that stores the peeled protection sheet. 3.