JPH0711050U - Original carrier sheet - Google Patents

Abstract

(57) [Summary] [Object] To provide an improved original carrier sheet that can effectively suppress slippage phenomenon between front and back films, which leads to defective feeding and deterioration of read image quality. A sheet S formed by binding a transparent surface film 1 and a base film 2 together at a side portion a, wherein an inner surface 2A of the base film 2 facing the surface film 1 is subjected to a texturing process or a surface coating process. It consists of a roughened surface.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a carrier sheet for documents conveyed to a scanner unit such as a facsimile machine.

[0002]

[Prior art]

 When sending a document to the scanner section of a facsimile machine, if the transmitted document is a special document listed below, a carrier sheet is used to prevent troubles such as document jams in the transport path. I. Bold manuscripts of wrinkles, curls, and corners b. Documents smaller than the minimum size c. Documents with a particularly thin paper d. Torn manuscript e. Transparent manuscript F. When sending small manuscripts in a batch. Ink or glue-free originals. In addition, manuscripts coated on the back or front, carbon paper on the back, manuscripts with holes, and manuscripts that have been pasted together.

As illustrated in FIG. 6, the carrier sheet S is usually formed by welding a transparent surface film 1 and a white base film 2 on one side of the upper side a or binding them together to form two sheets. As shown in the figure, when the original D is sandwiched between the films with the original surface facing up, the surface film 1 is repeated toward the reading side of the scanner section. It is set to the inset position.

[0004]

[Problems to be solved by the device]

 However, when a document is transmitted using the current carrier sheet S, slip easily occurs between the front and back films 1 and 2 of the sheet S conveyed to the scanner unit, and this slip causes a feeding failure. In some cases, the read image quality of a document image that is raised or caught in the sheet S may be significantly deteriorated.

As a cause of this, in a roller-pad type separating / feeding mechanism that is usually mounted in a facsimile apparatus, a frictional force that acts to separate the original sheet D into the carrier sheet S from the front and back sides acts, The above-mentioned one-side bound carrier sheet S is likely to cause slips in the vertical direction, and the surface side of the sheet S is formed of a glossy and slippery transparent film 1. It is considered that the slip of the front and back films 1 and 2 is further promoted during the transportation due to the following phenomenon.

FIG. 4 and FIG. 5 show a conveyance state of a carrier sheet S for gripping a document (not shown) with respect to a scanner section of a facsimile apparatus. In FIG. 4, reference numeral 3 denotes an entrance side of a document conveyance path. The separation roller 4 arranged is a separation pad which is elastically contacted with the separation roller 3, 5 is an extraction roller arranged on the exit side of the document conveyance path across the reading unit (scanning line) SCL, and 6 is attached to the extraction roller. Shows a press roller (nip roller) that is in contact with and is driven to rotate.

First, in the feeding start state shown in FIG. 4, the carrier sheet S fed by the separating roller 3 passes through the reading unit SCL of the conveying path, and then the leading end a thereof is driven in association with the separating roller 3. The eject roller 5 and the press roller 6 are nipped and discharged. At that time, due to the above-described frictional separation action of the separation pad 4, there is a tendency that slip (slack) 1 s in which the surface film 1 is relatively advanced in the vicinity of the leading end of the sheet S is likely to occur.

Next, paying attention to the time when the feeding is completed as shown in FIG. 5, when the rear end of the carrier sheet S separates from the nip point between the separation roller 3 and the separation pad 4, the surface film 1 is relatively moved as described above. Since the front end 1e of the front surface film 1 precedes the rear end 2e of the base film 2, the rear end 1e of the surface film 1 escapes from the nip point of the separation pad 4 as shown in FIG.

However, normally, the separation roller 3 is arranged so that it can be switched to a rotation-free state after the sheet S (original) is nipped by the extraction roller 5 and the press roller 6, so that the separation roller 3 is separated in this state. The back tension is applied only to the base film 2 which is still nipped by the pad 4. Then, the feeding speed V1 of the surface film 1 is abnormally increased as compared with the feeding speed V2 of the base film 2, and as a result, as shown by the chain double-dashed line in FIG. It will be promoted more and more.

Thus, if only the front surface film 1 is preferentially conveyed, the original document (not shown) sandwiched by the carrier sheet S cannot be sufficiently fed, so that the original image read by the reading unit SCL is in the sub-scanning direction. If the surface film 1 becomes a stretched image, and the surface film 1 floats from the original, it reflects light from the light source and hinders accurate image reading.

The present invention provides an improved original carrier sheet that can effectively suppress the slip phenomenon between the front and back films, which may lead to defective feeding and deterioration of read image quality, based on the above consideration results. is there.

[0012]

[Means for Solving the Problems]

 A document carrier improved and devised based on the present invention is a sheet in which a transparent surface film and a base film are bound together at their sides, and the inner surface of the base film facing the surface film is roughened by an appropriate means. It is made up of faces.

[0013]

[Action]

 If the inner surface of the base film is roughened, the coefficient of surface friction is increased and slippage with the surface film is suppressed.

[0014]

【Example】

 FIG. 1 shows an embodiment of a carrier sheet according to the present invention. The structure and form of the carrier sheet S are not different from the conventional ones, and the transparent surface film 1 and the white base film 2 are welded or bonded at one side of the upper side a to be bound together.

However, as shown in FIG. 2, the inner surface 2A of the base film 2 facing the surface film 1 is finished to have a rough surface having roughness. As a means for roughening the inner surface 2A of the base film 2, a surface coating treatment including a texture treatment or a printing treatment can be applied.

However, if the inner surface 2 A of the base film 2 is roughened, the coefficient of friction of the surface is increased, so that the slippage with the surface film 1 may occur directly or between the surface film 1. It will be blocked through the original document, and the slip between them will be suppressed.

Therefore, it is possible to effectively prevent problems such as a defective transfer due to excessive slip between the surface film 1 and the base film 2 and deterioration of read image quality of a document image.

FIG. 3 shows, as another embodiment, a case where the present invention is applied to a two-side bound carrier sheet S formed by binding an upper side portion a and a side portion b on one side.

In order to further enhance the slip prevention effect, the inner surface of the surface film 1 facing the base film 2 may be roughened, but generally, if the surface of the film is roughened, the film becomes cloudy. In many cases, providing the surface film 1 on the image reading side causes a problem in terms of ensuring transparency.

[0020]

[Effect of the Invention] As described above, in the carrier sheet of the original according to the present invention, due to the simple device of only roughening the inner surface of the base film facing the surface film, the reflow caused by the slip between the films It is possible to effectively avoid problems such as defectiveness and deterioration of read image quality.

[Brief description of drawings]

FIG. 1 is a perspective view of a carrier sheet showing an example.

2 is an enlarged cross-sectional view of a portion of the carrier sheet shown in FIG.

FIG. 3 is a perspective view of a carrier sheet showing another embodiment.

FIG. 4 is a schematic cross-sectional view of a document conveyance path showing a state where a carrier sheet is started to be fed.

FIG. 5 is a schematic cross-sectional view showing the state of the carrier sheet at the end of feeding.

FIG. 6 is a perspective view showing an outline of a carrier sheet and a method of using the same.

[Explanation of symbols]

 S Carrier sheet a, b Sides D Original 1 Surface film 1e Rear edge 1s Slip 2 Underlayer film 2A Inner surface (rough surface) 2e Rear edge 3 Separation roller 4 Separation pad 5 Extract roller 6 Press roller SCL Scanning section (scanning) line)

Claims (1)

[Scope of utility model registration request] 1. A carrier sheet for an original, which is a sheet obtained by binding a transparent surface film and a base film together at their sides, wherein the inner surface of the base film facing the surface film is roughened.