JPH06194816A - Sheet heating device - Google Patents

Abstract

PURPOSE:To preheat a sheet without making an entire device large or making power consumption high in a sheet heating device heating the sheet after evaporating moisture inside the sheet by preheating. CONSTITUTION:A driving roller 53, plural driven rollers 54, and plural regulating rollers 57 are rotatably arranged around a heating roller 51 so that they are respectively supported by opposed side plates. An endless belt 56 is laid over the rollers 53 and 54 to be pressed against the roller 51 and the outer peripheries at both ends of the roller 51 are pressed against the roller 57 so as to rotatably support the roller 51. A shaft-like rotating body 60 pressing the sheet S against the roller 51 is supported to be arranged in parallel with the roller 51 by the opposed side plates on the front side of the insertion position (a) of the sheet S. The sheet S is preheated in a state where it is pressed on the roller 51 by the rotating body 60.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a copying machine, printer,
The present invention can be applied to sheet-using devices such as facsimiles and printing machines that record on sheets such as paper and envelopes. Specifically, in such a sheet-using device, an endless belt is pressed against the outer periphery of the heating roller, a sheet is inserted between them, and the sheet is conveyed along with their rotation,
The present invention relates to a sheet heating device that applies heat to the sheet with the heating roller to perform, for example, development, image fixing, and drying.

[0002]

2. Description of the Related Art When a sheet heating device of this type is rapidly heated with high heat, a rapid evaporation of water contained in the sheet may cause abnormalities in a recorded image or wrinkles on the sheet. Sometimes.

Therefore, conventionally, there is a sheet heating apparatus of this type which preheats the sheet, dries the sheet by the preheating, and then heats the sheet with high heat.

In such a sheet heating apparatus, for example, as shown in FIG. 9, a heating roller 2 having a heating element 1 incorporated therein is rotatably provided, and a plurality of rollers 3 are provided around the heating roller 2. ...... are arranged, the endless belt 4 is stretched between the rollers 3, and pressed against the outer periphery of the heating roller 2, and the seat between the heating roller 2 and the endless belt 4 is arranged. A portion of the endless belt 4 is stretched to provide a stretched portion 4a in front of the insertion position B of S, and another stretched portion 4a is pressed against another endless belt 5.

When the heating roller 2 is heated by the heating element 1 and the endless belts 4 and 5 are driven to rotate by rotationally driving the heating roller 2, the heating roller 2 moves to the endless belt 4. Heat is transmitted. Then, the sheet S is inserted between the endless belts 4 and 5, and sandwiched between them to be conveyed. At that time, the heat of the endless belts 4 and 5 preheats the sheet S to evaporate the moisture in the sheet S. After that, steam is allowed to escape from the sheet S exiting between the endless belts 4 and 5, the sheet S is inserted from the insertion position a between the heating roller 2 and the endless belt 4, and the sheet S is conveyed as they rotate. However, the sheet S is heated by the heating roller 2 to develop the sheet S, fix the image, or dry the sheet S.

[0006]

However, in such a sheet heating apparatus, since the sheet S is preheated between the stretched portion 4a of the endless belt 4 and another endless belt 5, the size of the entire apparatus is increased. Moreover, there is a problem that the thermal efficiency of the heating roller 2 is lowered and the power consumption is increased.

Therefore, an object of the present invention is to preheat a sheet in a sheet heating apparatus which preheats the sheet to evaporate the moisture in the sheet and then heats the sheet without increasing the size of the apparatus or increasing the power consumption. Is to be able to give.

[0008]

Therefore, what is stated in claim 1 is, for example, as shown in the following illustrated embodiment,
A sheet heating in which the endless belt 56 is pressed against the outer periphery of the heating roller 51, the sheet S is inserted between them, and the sheet S is heated and discharged by the heating roller 51 while conveying the sheet S as they rotate. In the device 45, a rotating body 60 that temporarily presses the insertion sheet S against the heating roller 51 and preheats it before the sheet insertion position B between the heating roller 51 and the endless belt 56.
Is provided.

According to a second aspect of the present invention, for example, as shown in the following illustrated embodiment, in the seat heating device 45 of the first aspect, the endless belt 56 is wound around the rotating body 60, and the insertion sheet S is inserted. The rotating body 6
0 is pressed against the heating roller 51 through the endless belt 56.

[0010]

According to the first aspect of the present invention, the sheet S is temporarily pressed against the heating roller 51 by the rotating body 60 before the sheet insertion position B, and the sheet is directly moved by the heating roller 51. Preheat S.

According to the first aspect, the rotating body 60 and the endless belt 56 are both driven.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 3 shows an overall schematic configuration of a diazo copying machine equipped with a sheet heating apparatus according to an embodiment of the present invention.

This diazo copying machine, as shown by the dotted line,
A sheet feeding section A is provided on the lower left side of the apparatus main body 10, an exposure section B is provided on the right side of the sheet feeding section A, a separation / conveyance section C is provided on the upper left side of the exposure section B, and the separation / conveyance section is provided. A developing section D is provided on the upper right side of C.

The paper feed section A is provided with an original manual feed table 13 on the upper side, and a paper feed cassette 14 accommodating a sheet S which is a photosensitive paper is attached on the lower side thereof. A document transport path 16 is provided in the transport direction on the right side of FIG.
After that, the merging and conveying path 19 is linearly provided. The document feed path 16 has a first feed roller pair 15 in order from the left in the drawing,
The detection means 17 and the first stopper 18 are arranged respectively.
Further, a sheet conveying path 21 is provided in the right sheet feeding direction in the drawing from the sheet feeding cassette 14. The sheet conveying path 21
Is connected to the confluent transport path 19.

Then, the document P is inserted from the manual document feeding table 13 into the document conveying path 16 through the first feed roller pair 15 which is slightly separated in advance. Then,
The original P is detected by the detecting means 17, the retractable first stopper 18 blocking the original conveying path 16 is retracted, and the first feed roller pair 15 is brought into pressure contact with the original P to rotate the original P. The sheet is conveyed through the conveying path 16 to the confluent conveying path 19. At the same time, the sheet feeding roller 20 is rotated to feed the sheet S out of the sheet feeding cassette 14.
Then, the sheet P is conveyed to the merging / conveying path 19 through the sheet conveying path 21, and is merged with the original P to be superposed. afterwards,
The original P and the sheet S are passed through the second feed roller pair 22 which are separated from each other in advance, and are brought into contact with the second stopper 23 which can be retracted to align the leading ends. Then, the second stopper 23 is retracted, and the overlapped sheet S and document P are fed to the exposure section B by the second feed roller pair 22.

In the exposure section B, a transparent cylinder glass 26 containing a fluorescent lamp 25 is rotatably provided, and a driving roller 27 and a plurality of driven rollers 28 are arranged around the cylinder glass 26, An endless belt 29 is stretched between the rollers 27 and 28, and the endless belt 29 is pressed against the outer peripheral surface of the cylinder glass 26.

Then, the fluorescent lamp 25 is turned on, the sheet S and the document P are inserted between the cylinder glass 26 and the endless belt 29, and the sheet S and the original P are exposed by the light energy of the fluorescent lamp 25 while being sandwiched and conveyed between them. Sheet S
Form a latent image on top. Then, the exposed sheet S
Then, the document P is sent to the separation / conveyance unit C.

The separating / conveying section C has a pickoff plate 32 whose one end is pressed against the outer peripheral surface of the cylinder glass 26. Further, a document suction means 34 and a sheet suction means 35 each having a suction fan (not shown) are provided on the left and right sides of the conveyance path 33 in the figure. The document adsorbing means 34 is configured such that a conveying belt 38 is stretched between a driving side conveying roller 36 and a driven side discharging roller 37.

Then, the sheet S and the document P that have exited the exposure section B are guided by the pickoff plate 32 to the conveyance path 33 of the separation / conveyance section C. Then, while the document P is sucked by the document suction means 34, the sheet S is sucked by the sheet suction means 35.
Is sucked to separate the original P and the sheet S. Then, one of the separated originals P is conveyed by the conveyance belt 38 and the original discharge rollers 39 pressed against the original to a document discharge tray 40.
Discharge on top. The other sheet S is the sheet conveying roller 4
1 and the intermediate transfer roller pair 42, etc., and conveys them to the upper developing section D.

The developing section D is equipped with the sheet heating device 45 according to the present invention. And this sheet heating device 4
At 5, the sheet S is heated while being conveyed to develop the latent image.
After the development, the pair of discharge rollers 46 discharges the document P onto the copy tray 47 to complete the copy of the original P.

By the way, the sheet heating device 45 described above is used.
Is configured in detail as shown in FIGS. Reference numeral 50 in FIG. 2 denotes one of the side plates facing each other on the left and right. On the inner surfaces of the facing side plates 50, a plurality of regulating rollers 57 ... Then, the outer circumferences of both ends of the heating roller 51 are applied to the restriction rollers 57, ... And the heating roller 51 is rotatably provided between the opposing side plates 50. A driving roller 53 is provided around the heating roller 51.
And a plurality of driven rollers 54 .. Both ends of the driving roller 53 and the driven roller 54 are rotatably provided on the opposite side plate 50. An endless belt 56 is stretched between the driving roller 53 and the driven roller 54, and the endless belt 56 is pressed against the outer peripheral surface of the heating roller 51 to heat the heating roller 5.
1 is pressed against the regulation roller 57 .... Then, the insertion side of the sheet S between the heating roller 51 and the endless belt 56 is the sheet insertion position B, and the ejection side is the ejection position B. The heating roller 51 has a cylindrical shape and a heating element 52 is provided at the center thereof. The heating element 52
Is formed by penetrating the holes 50a of the opposite side plate 50 at both ends.

Now, before the sheet insertion position B,
Rotating body 60 that presses the sheet S against the heating roller 51
To provide. The rotating body 60 has a shaft shape, both ends of which are rotatably supported by the facing side plates 50, and is provided in parallel with the heating roller 51. On the other hand, a pick-off plate 61 is arranged at the discharge position B of the sheet S, and the tip of the pick-off plate 61 is appropriately urged by urging means to lightly press the outer peripheral surface of the heating roller 51. Further, a thermistor 62 which is supported by the pick-off plate 61 and detects the surface temperature of the heating roller 51, and a safety means 63 which maintains the surface temperature of the heating roller 51 at an appropriate temperature are arranged.

As shown in FIG. 1, in the above-described sheet heating device 45, the heating roller 51 is heated by the heating element 52 during development, while the driving force of the driving motor is appropriately transmitted to the driving roller. 53 is rotationally driven. Then, the driving roller 53 rotationally drives the endless belt 56 to rotate the heating roller 51, and the rotary body 60 to rotate. Then, the sheet S fed from the separating / conveying unit C is inserted between the rotating body 60 and the heating roller 51 as shown in FIG. At that time, the sheet S is temporarily pressed against the heating roller 51 by the rotating body 60, and the sheet S is preheated by the heating roller 51 to evaporate the moisture in the sheet. Then, the rotating body 60 and the heating roll
After allowing the steam to escape from the sheet S passing between the rollers 51, the sheet S is inserted from the insertion position B between the heating roller 51 and the endless belt 56. Then, while the heating roller 51 and the endless belt 56 are rotated, the sheet S is conveyed while the heating roller 51 applies high heat to the sheet S to develop the latent image. After the development, the sheet S attached to the outer peripheral surface of the heating roller 51 is peeled off by the pick-off plate 61 and discharged from the discharge position b.

In the sheet heating device 45 of the illustrated embodiment described above, the rotary body 60 is, for example, a rigid body roll.
4, the roller shaft 66 is movably inserted into a guide groove 65 provided in the opposite side plate 50 as shown in FIG. 4, and one end of the roller shaft 66 is hooked on the biasing member 67. The heating roller 51 is pressed by the urging force of. Here, the biasing member 67 is supported by the opposing side plate 50, and the other end is appropriately hooked thereto.

However, the rotating body 60 is formed by an elastic roller, and its roller shaft is rotatably supported by the opposite side plate 50, and the heating roller is heated by the elasticity of the elastic roller as shown in FIG. -It may be configured to press against the la 51.

In the illustrated embodiment described above, the rotating body 6
0 was directly pressed against the heating roller 51. However, as shown in FIG. 6, the rotating body 60 includes the rollers 68, 68 hung on the opposite side plate 50 and the rollers 68, 68.
The endless belt 69 may be formed around the endless belt 69, and the endless belt 69 may be pressed against the heating roller 51.

Furthermore, in all the above-mentioned embodiments,
The rotating body 60 is provided regardless of the endless belt 56.
However, as shown in FIGS. 7 and 8, similarly, the endless belt 56 that is wound around the plurality of driven rollers 54 ... And wound around the heating roller 51 is also wound around the rotating body 60 and is supported between the opposing side plates 50. The endless belt 56 may be temporarily separated from the outer periphery of the heating roller 51 by the guide roller 71 and then wound around the outer periphery of the heating roller 51 again, and the endless belt 56 may be rotationally driven by the rotation of the rotating body 60, for example. The position where the endless belt 56 is once separated from the outer periphery of the heating roller 51 by the guide roller 71 is referred to as the sheet insertion position B in the present invention. The heating roller 51 is
Similarly, it is supported by a plurality of regulation rollers 57 ....

Thus, in the embodiment shown in FIGS. 7 and 8, the endless belt 56 is rotationally driven by the rotation of the rotating body 60, and the heating roller 51 heated by the heating element 52 is rotated. Then, the insertion sheet S sent from the separating / conveying unit C is temporarily pressed against the heating roller 51 by the rotating body 60 via the endless belt 56, and the heating roller 51 is heated.
Then, the sheet S is preheated to evaporate the moisture in the sheet S. Then, the sheet S is inserted from the sheet insertion position B between the heating roller 51 and the endless belt 56, high heat is applied and developed as in the above-described embodiment, and the sheet is discharged from the discharge position B.

[0029]

Therefore, according to the present invention, in the sheet heating apparatus, the sheet is preheated by pressing the sheet against the heating roller by the rotating body before the sheet insertion position. The entire device can be downsized by omitting such a long endless belt or another endless belt, and the heat energy of the heating roller escapes less, which prevents the reduction of thermal efficiency and consumes it. The power can be reduced.

According to the second aspect of the invention, since the rotary body and the drive roller are commonly used, the number of parts can be reduced and the size can be reduced.

[Brief description of drawings]

FIG. 1 is a side view of a sheet heating apparatus according to an embodiment of the present invention.

FIG. 2 is a perspective view of the sheet heating apparatus.

FIG. 3 is an overall schematic configuration diagram of an internal mechanism in a diazo copying machine including the sheet heating device.

FIG. 4 is a side view of the sheet heating apparatus showing an example of a specific configuration of pressing a rotating body of the sheet heating apparatus.

FIG. 5 is a side view of a sheet heating apparatus showing another example of its specific configuration.

FIG. 6 is a side view of a sheet heating apparatus according to another embodiment of the present invention.

FIG. 7 is a side view of a sheet heating apparatus according to still another embodiment.

FIG. 8 is a perspective view thereof.

FIG. 9 is a vertical sectional view of a conventional sheet heating apparatus.

[Explanation of symbols]

 45 seat heating device 51 heating roller 56 endless belt 60 rotating body S seat Y seat insertion position

Claims (2)

[Claims] 1. A sheet that is heated by the heating roller and discharged while the endless belt is pressed against the outer periphery of the heating roller, a sheet is inserted between them and the sheet is conveyed along with their rotation. In the heating device, before the sheet insertion position between the heating roller and the endless belt, a rotating body that temporarily presses the inserted sheet against the heating roller to preheat it is provided. Heating device. 2. The seat according to claim 1, wherein the endless belt is wound around the rotating body, and the insertion sheet is temporarily pressed against the heating roller by the rotating body via the endless belt. Heating device.