JP2568577Y2 - Decurling device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a decurling apparatus used for a facsimile, for example, for removing curling of roll paper as a recording paper.

[0002]

2. Description of the Related Art Conventionally, the above-mentioned curl removing device used for a facsimile or the like includes, for example, Japanese Patent Publication No. 1-57.
No. 019, a curving guide provided at a changing point of the transport path of the roll paper fed from the roll paper tray, a curl removing roller engaging with the curving guide, and the curling removing roller being attached to the curving guide. Pressing means for applying a constant pressing force to the pressing means, and a bearing for movably supporting a support shaft of the curl removing roller along an elongated hole provided on both side plates of the apparatus. A device has been proposed in which the roll paper is separated from the curved guide portion in proportion to the tension received from the roll paper to prevent the tension of the roll paper from being reduced due to the size of the roll paper and the occurrence of uneven feeding. ing.

[0003]

However, in the device disclosed in Japanese Patent Publication No. 1-57019, the curl removing device includes a curl removing roller, a pressing means for the curl removing roller, and a support shaft of the curl removing roller. Therefore, it is considered that there are problems in that the number of parts is large, the structure is complicated, and the cost is also increased because parts such as bearings are required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is relatively simple in structure by reducing the number of parts as much as possible, and at the same time, it is possible to surely reduce the cost while ensuring the roll paper ( It is an object of the present invention to provide a curl removing device capable of removing curl of recording paper).

[0005]

In order to achieve the above object, a curl removing device according to claim 1 abuts on a roll paper fed from a roll paper tray to bend the roll paper, and according to the tension of the roll paper. and an elastic deformation to curl removing plate having a spring property of changing the bending angle of the roll paper Te, the curl removing plate is openable cover
Formed at the free end of the recording head protection plate
When the cover is opened, it cooperates with the recording head protection plate.
To protect the recording head from being exposed .

[0006]

According to the curl removing device of the present invention, the curl is forcibly bent in the direction opposite to the curl direction by the curl removing plate having a spring property, and the curl is removed. Thus, the number of parts can be reduced.

Further, the curl removing plate is provided with an openable and closable
At the free end of the recording head protection plate located behind the bar
And cooperates with the recording head protection plate when the cover is opened.
To protect the recording head from exposure .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is a cross-sectional view of the facsimile, and the original paper set on the original tray 1 is
The document is separated one by one by a document sheet separation and feed mechanism A having a sheet feed roller 2 and a separation sheet 3 made of rubber or the like pressed with a constant pressure against the sheet feed roller 2 to read downstream. Sent to part B. Then, it is sandwiched between the pressure roller 4 provided in the reading section B and the paper feed roller 5, and comes out of the light source 7 disposed between the paper feed roller 5 and the paper discharge roller 6, so that the original paper The reflected light is reflected by the two mirrors 8a and 8b and is input to the CCD 9 for reading, and the read original sheet is discharged from the discharge roller 6 to the outside.

An upper cover 3 is provided on the rear upper surface of the facsimile.
0 is provided to be openable and closable by rotating about a shaft 31 provided at the rear. This upper cover 30
The recording section C is attached to the back side of the recording medium.

On the other hand, a thermal head 13 supported by a heat radiating plate 11 connected to a relay board 10 and urged downward by a spring 12 is provided in the recording section C.
Platen roller 14 located below and in pressure contact with
And are provided. Then, the roll paper 17a at the maximum diameter or the roll paper 17b at the minimum diameter stored in the roll paper tray 15 wound around the paper tube 16 is curled by a curl removing plate 18 having a spring property. After the curl is removed by the removing device D, it is printed when passing between the thermal head 13 and the platen roller 14, discharged to the receiving paper tray 19, and cut by the cutter 21 supported by the cutter support frame 20. Have been like that.

In FIG. 1, reference numeral 22 denotes a recording paper detection sensor for detecting the presence or absence of roll paper, reference numeral 23 denotes an operation panel, and reference numeral 24 denotes a power supply. FIG. 1 shows the details of the curl removing device D.

That is, on the side of the thermal head 13 of the roll paper tray 15, there is provided a curved guide portion 25 projecting upward and forming a changing point of the transport path of the roll paper. The plate 18 is arranged so as to face the curved guide portion 25, and is formed so as to extend further downward and then bend upward toward the thermal head 13. The curl removing plate 18 is integrated with a free end of a recording head protection plate 26 disposed so as to cover above the roll paper 17a, 17b in order to protect a recording head for reception including the thermal head 13. The curl removing device D is thus formed.

The head protection plate prevents a finger or foreign matter from entering the thermal head when the upper cover is opened. The curl removing plate and the thermal head protection plate are formed by bending one elastically deformable metal plate having a width slightly larger than the width of the roll paper at two places, and fixing the metal plate to the upper cover with screws 33. In addition, the number of parts can be significantly reduced as compared with the conventional apparatus, and the assembling process can be facilitated.

Next, the operation of the curl removing device D will be described. The roll papers 17a and 17b are provided with a curved guide portion 25 which is a change point of the transport path, and a curved guide portion 25.
The thermal head 1 is located at a position facing the
The curl is removed by being forcibly bent at the bent portion 18a of the curl removing plate 18 having a spring property and bent in the direction opposite to the curl direction.

When the diameter of the roll paper is large, the degree of curl is relatively small and the weight of the entire roll paper is heavy, so that the tension applied to the roll paper at the time of paper feeding increases. Then, the curl removing plate is elastically deformed to raise the bending point 18a, and the angle of bending of the roll paper at that point becomes an obtuse angle. Therefore, the effect of curl removal is low, and the roll paper is prevented from curling in the opposite direction.

On the other hand, when the use of roll paper advances and the diameter of the roll paper decreases, the degree of curl increases and the roll paper itself becomes lighter, so that the tension applied to the roll paper also decreases. Then, the bent portion of the decurling plate is lowered by its own elasticity. Then, the angle of curvature of the roll paper at the bent portion becomes an acute angle. Therefore, the effect of the curl removal is increased, and the curl is reliably removed.

The degree of the curl removing plate is set so that the curl of the roll paper is replaced and the curl is not reversed in the opposite direction regardless of the diameter of the roll paper.

In the illustrated embodiment, the decurling plate 1
8 is constituted by a single sheet extending over the entire width of the roll paper 17a, 17b.
Although an example is shown in which an opening 18b through which the paper 2 can pass is provided, a part of the roll paper 17a, 17b is locally brought into contact with the roll paper 17b, and the recording head protection plate 26 is bent.
May be provided with a slit at the connecting portion with the spring, so that a spring property can be provided through the slit.

The curl removing plate and the thermal head protection plate can be formed integrally with the upper cover. In addition, the present invention can be variously modified without departing from the spirit thereof.

[0020]

[Effect of the invention] As is clear from the above description,
ADVANTAGE OF THE INVENTION According to this invention, a curl removal apparatus can be comprised by reducing the number of parts as much as possible, thereby making it possible to achieve a comparatively simple structure and cost reduction.
When the cover is opened, the curl removing plate and the recording
To prevent the recording head from being exposed in cooperation with the pad protection plate.
Hands around the recording head when opening the cover
Direct contact can be prevented.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a main part of an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the facsimile.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 2 ... Paper feed roller 3 ... Separation piece sheet 7 ... Light source 9 ... CCD 13 ... Thermal head 14 ... Platen roller 15 ... Roll paper tray 17a, 17b ... Roll paper 18 ... Curl removing plate 25 ... Curving guide part 26 ... Recording head protection Plate A: Document paper separating and feeding mechanism B: Reading unit C: Recording unit D: Curl removing device

Claims (1)

(57) [Scope of request for utility model registration] The present invention has a resiliency in which the roll paper is bent by contacting the roll paper fed from a roll paper tray and elastically deformed according to the tension of the roll paper to change the bending angle of the roll paper. It has a curl removing plate ,
The decurling plate is disposed behind a cover that can be opened and closed.
Formed at the free end of the recording head protection plate
When the recording head is opened, the recording head
A decurling device for protecting a pad from being exposed .