JPH01249493A - Protective sheet for printing paper for use on printer - Google Patents

Abstract

PURPOSE:To perform clear printing and secure supply of printing papers to a printing part by one sheet at a time to the last sheet, by covering the printing side of the lowermost one of the printing sheet with a sheet having substantially the same shape as that of the printing paper and provided with data indicative of inhibition of paper supply. CONSTITUTION:The printing side 5a of the lowermost one 5 of a plurality of printing papers 5 stacked is covered with a sheet 23, so that the printing side 5a of the lowermost printing paper 5 is not stained with fingerprints or the like when the stack of the papers is placed into a paper-supplying tray 14, and clear printing can be performed. The lowermost printing paper 5 is not supplied together with the second lowest printing paper 5. The printing papers 5 placed on a bottom plate 15 of the tray 14 can be fed securely and smoothly to a printing part 4 by one sheet at a time to the last one, by pressing the papers 5 against a paper-supplying roller 6 with a constantly fixed pressure by a turning of a paper-supplying lever 16 and an energizing force of a torsion spring 19.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a dye sublimation thermal transfer type color printer, etc., in which printing paper (photographic paper) is brought into contact with a platen, and color printing is performed by a print head via an ink ribbon. Concerning a protective sheet for printing paper for printers.

B1 Overview of the Invention The present invention is a protective sheet for printing paper for a printer that prints on the printing paper in a printing section in the printer, which protects a plurality of sheets stacked and fed sequentially from the top to the printing section in the printer. By covering the printed side of the lowest printed paper with a sheet that has approximately the same shape as the printed paper and has information indicating that paper feeding is prohibited, multiple sheets of printed paper are stacked. It is possible to prevent the print surface of the lowest print paper from becoming dirty and print clearly on the print paper, and when feeding the second print paper from the bottom to the printing unit, the lowest print paper This system prevents paper from being fed at the same time as the printer, thereby ensuring that each sheet of paper is fed to the print section of the printer one by one until the end.

[Prior Art] For example, a printer is known in which a print paper fed from a paper feed tray is completely wrapped around a platen, and a print head prints on the print paper via an ink ribbon. The general structure of this printer will be explained with reference to FIG. 6. Reference numeral 30 is a printer, and in the upper and lower positions facing the printing section 31 in the printer 30, there is a paper discharge section 32 and a paper feed section KS.
33 are arranged respectively. A paper feed roller 34 as a paper feeding means is provided at a position near the paper feeding section 33 between the paper ejection section 32 and the paper feeding section 33, and a print paper 35 is placed on the paper feeding section 33. A paper feed tray 37 having a bottom plate 36 is detachably provided.

A compression coil spring 38 is interposed between the paper feed tray 37 and the bottom plate 36, so that the printed paper 35 stacked on the bottom plate 36 is always pressed against the paper feed roller 34. The print paper 35 is conveyed to the platen 39 of the printing unit 31 by the paper feed roller 34 and wrapped around the platen 39. The print paper 35 is printed by the print head 40 of the printing unit 31, and is then discharged via the paper discharge roller 41. They are discharged to a section 32 and stacked.

D1 Problems to be Solved by the Invention However, when a plurality of sheets of print paper 35 are stored in the paper feed tray 37 of the conventional printer 30, dirt such as fingerprints is likely to be attached to the print surface of the lowest print paper 35. There was a drawback that clear prints could not be made due to the stains. Also,
Since the lowest printed paper 35 is in contact with the metal bottom plate 36 of the paper feed tray 37, the second printed paper 35 from the lowest is moved to the printing section 31 due to the difference in the coefficient of friction between the two.
There was a problem in that when paper was fed to the printer, the lowest printed paper 35 was also fed together.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a protective sheet for printing paper for printers that can protect the printed surface of the lowest printing paper from stains such as fingerprints.

[Means for solving the problem] The print surface of the lowest print paper of a plurality of sheets of print paper stacked up, which are sequentially fed into the printing section of a printer from the top to the top, has a shape that is approximately the same as that of the print paper. , and covered with a sheet having information indicating that paper feeding is prohibited.

[Function] Since the printed surface of the lowest printed paper in a stack of multiple sheets of printed paper is covered with a sheet and is in contact with it, the printed surface of the lowest printed paper is prevented from becoming dirty, and Even when the second print paper is fed to the printing section of the printer, the lowest printer paper is not fed together with it.

Further, when the print paper of the lowest printer paper is fed to the printing unit, it is known that the print paper is out due to information indicating that feeding of the sheet is prohibited.

[Example] Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

In Fig. 2, l is a color printer using a dye sublimation thermal transfer method.On the right side of the front side, there is a shelf-shaped paper feed tray tray holder 2 and a paper output tray tray 3, which face the printing section 4 located on the left side. They are arranged on the lower and upper sides respectively.

Above the paper feed tray receiver 2, a pair of paper feed rollers 6.6 are rotatably supported via a spindle 7 as paper feed means for conveying the print paper 5 one sheet at a time to the printing section 4. In addition, there is a printing section 4 between the printing section 4 and the paper output tray receiver 2.
A paper ejection roller 8, which sends out the printed paper 5 to the paper ejection tray receiver 3 side, is rotatably supported via a support shaft 9. Further, approximately at the center of the printing section 4, a platen 1O is rotatably supported via a support shaft 11.

The printing section 4 on the lower side of the platen 10 serves as a ribbon cartridge storage section I3 that stores the ribbon cartridge 12.

Further, a paper feed tray 14 is removably housed in the paper feed tray holder 2. This paper feed tray 14 is made of resin, and has an opening 14a having the same shape as the opening 2a at a position corresponding to the opening 21 of the paper feed tray receiver 2. Also, the fifth
The right end 15a in FIG. 5 of a metal channel-shaped bottom plate 15 on which a plurality of sheets of printed paper 5 are stacked and placed is fitted into the elongated hole 2c on the right side in the figure to support it. be.

The left end 15b of the bottom plate 15 in the figure has a curved shape so that, for example, 1 to 100 sheets of printed paper 5 can be pressed against the paper feed roller 6 with a constant paper feeding pressure.

Further, below the opening 2a of the paper feed tray receiver 2, a paper feed lever 16 is mounted on a support shaft 17 for moving the left end 15b side of the bottom plate 15 of the paper feed tray 14 until it comes into contact with each of the paper feed rollers 6. It is rotatably supported through the support. This spindle 1
7 is provided with an actuating plate 18. When the operating plate 18 is rotated by a drive mechanism (not shown), the paper feed lever 16 can be freely rotated in a direction to push up the bottom plate 15 of the paper feed tray 14. Further, a torsion spring 19, which is engaged with the paper feed lever 16 and the operating plate 18, is wound around the support shaft 17. Due to the biasing force of the torsion spring 19, the paper feed lever 16 is constantly biased upward.

Furthermore, a pair of light-reflecting paper sensors 20 as detection means for detecting the presence or absence of print paper 5, etc. are installed approximately directly below both sides of the support shaft 7 of the pair of paper feed rollers 6;
20 is provided via a mounting plate 21.

As shown in FIG. 1, the print papers 5 are stacked in the paper feed tray 14 with the print surface 5a facing down. Furthermore, codes (information) 5b, 5b are printed at predetermined positions on the upper and lower edges of the printed surface 5a of the printed paper 5, as shown in FIG. In addition, Fig. 3 shows an OH
P paper 22 is shown. Print side 2 of this OHP paper 22
Codes 22b, 22b are also printed on the upper and lower edges of 2a at positions symmetrical to the left and right sides of the printed paper 5.

Reference numeral 23 in FIG. 4 is a sheet made of synthetic paper made of translucent resin, which constitutes the gist of the present invention. This sheet 23 is formed to have approximately the same shape as the printed paper 5, and protects the printed surface 5a of the lowest stacked printed paper 5. Codes (information) 23b, 23b indicating prohibition of paper feeding are printed on the edges.

The codes 23b, 23b are detected by the pair of paper sensors 20, 20 described above.

According to the above embodiment, the paper feed lever 16 rotates upward from the horizontal state to push the bottom plate 15 in the paper feed tray 14 toward the pair of paper feed rollers 6. Press it against the paper roller 6.

At this time, the print paper 5 is reliably pressed against each paper feed roller 6.6 with a predetermined pressure contact force due to the flexural deformation of the torsion spring 19. At this time, print surface 5+L of print paper 5
must be facing downward, which is caused by the pair of paper sensors 2 on both sides of the pair of paper feed rollers 6.
If the state shown in FIG. 1 is determined by 0 and 20, the downward direction is detected. Also, a black code 5 is attached to both ends of the print paper 5.
b.

If 5b is not present, it is detected that the front and back sides are reversed (printed side 5a is facing upward). Furthermore, as shown in FIG.
b, 5b, if the arrangement is reversed, it is identified as OHP' paper 22, and as shown in FIG. , "Out of paper" is detected.

In this way, the printed surface 5a of the lowest printed paper 5 of the stacked plurality of printed papers 5 is covered with the sheet 23 and is in contact with the printed paper 5, so that the printed surface 5a of the lowest printed paper 5 is When the tray 14 is stored, it is not contaminated with fingerprints, etc., and clear prints can be made.

Furthermore, when feeding the second print paper 5 from the bottom to the printing section 4 of the printer main body 1, the bottom printer paper 5 is fed together with the second print paper 5 from the bottom. The printed paper 5 placed on the bottom plate 15 of the paper feed tray 14 is moved to the paper feed lever 16 side by a complicated paper feeding mechanism or the like due to the rotation of the paper feed lever 16 and the biasing force of the torsion spring I9. Paper feed roller 6 without any stage
1 to the end of the printing part 4.
It is possible to transport and feed sheets one by one reliably and smoothly.

In particular, even when printing on the OHP paper 22, by covering the printing surface 22+L with the sheet 23, the same functions and effects as those of the printing paper 5 can be achieved.

H9 Effects of the Invention As described above, according to the present invention, the print surface of the lowest print paper of a plurality of stacked print papers that are sequentially fed into the printing unit in the printer from the top to the top is Since it is covered with a sheet that has approximately the same shape as the paper sheet and has information indicating that paper feeding is prohibited, it prevents the print surface of the lowest print paper of a stack of multiple sheets of print paper from becoming dirty and allows clear printing. At the same time, when feeding the second print paper from the bottom to the print section, it prevents the paper from being fed simultaneously with the bottom print paper, ensuring that one print paper at a time is fed to the print section of the printer until the end. Paper can be fed to

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of a plurality of sheets of printed paper stacked on a paper feed tray showing an embodiment of the present invention, FIG. 2 is a plan view of the printed paper, FIG. 3 is a plan view of OHP paper, and FIG. 5 is a sectional view of the printer, and FIG. 6 is a schematic diagram illustrating the structure of a conventional printer. DESCRIPTION OF SYMBOLS 1... Printer, 4... Printing part, 5... Print paper, 51L... Print surface, 23... Sheet, 23
b...Code (information).

Claims (1)

[Claims] (1) The printed surface of the lowest printed paper in a stack of multiple sheets of printed paper that is fed sequentially from the top to the printing section of the printer has approximately the same shape as the printed paper, and feeding is prohibited. A protective sheet for printing paper for a printer, characterized in that the sheet is covered with a sheet having information indicating.