Abstract:
A printing paper discharging apparatus comprises a discharge roller, a take-out roller engaged with and driven by the discharge roller, guide members fixed on the take-out roller and provided with elastic blades for instantly pushing the trailing edge of printing paper into a paper box, thereby obtaining a complete discharging of the printing papers.

Description:
BACKGROUND OF THE INVENTION 
     1. Field of the Invention 
     The present invention relates to an apparatus for discharging a printing paper in a color video printer which is capable of completely discharging printing papers into a paper box by providing guide members for guiding the discharge of printing papers at a take-out roller which is engaged with a discharging roller. 
     2. Description of the Prior Arts 
     In general, a color video printer is constituted such that a printing paper is fed by a pair of feed rollers along a paper passage which is defined by an upper guide and a lower guide. After passing through the paper passage, the printing paper is transferred between a pinch roller and a grip roller and then located below a donor cassette containing a film therein. When the trailing edge of the printing paper is located between the pinch roller and the grip roller, the printing paper is pressed on a platen roller together with the film from the donor cassette by a thermal print head. The printing paper which is in contact with the platen roller is inversely transferred by an inverse rotation of the grip roller and at this moment a predetermined picture image is printed on the printing paper. Then, the printing paper is discharged into a paper box by a discharge roller and a take-out roller. 
     A conventional color video printer with such a typical discharging path is illustrated in FIG. 1. As shown in FIG. 1, the conventional color video printer comprises a pair of feed rollers 1a and 1b on which a feed belt 1c is wound, a roller 2a rotatably mounted below the feed roller 1a for preventing a double feeding, a donor cassette guide 3 fixed adjacent to the roller 2a, an upper and a lower guides 4 and 5 for defining a passage 30, a grip roller 6 and a pinch roller 7 engaged with each other, a platen roller 8 rotatably mounted in front of the rollers 6 and 7, a thermal print head 9 pivotably mounted over the platen roller 8, a donor cassette 10 supported by donor cassette guides 3 and 3a between the thermal print head 9 and the platen roller 8, a take-out roller 11 and a discharge roller 12 engaged with each other and provided at the rear side of the lower guide 5, and a paper box 13 supported at the rear side of the discharge roller 12 by a support member 14. 
     In FIG. 1, reference numeral 5a denotes a printing paper guide, 13a a rim portion of the paper box 13, 15 a printing paper, 16 a cam, 17 a link mechanism, and 18 a film. 
     The color video printer as shown in FIG. 1 operates as follows. 
     A shown in FIGS. 1 and 2, a printing paper 15 is fed by the feed rollers 1a and 1b and passes through the paper passage 30 defined by the upper and lower guides 4 and 5. And then, the printing paper 15 is transferred between the donor cassette guide 3a and the printing paper guide 5a by the grip roller 6 and the pinch roll 7. At this moment, when the trailing edge of the printing paper 15 is located between the grip roller 6 and the pinch roller 7, the thermal print head 9 rotates toward the platen roller 8 by the operation of the cam 16 and the link mechanism 17 so that the printing paper 15 and the film 18 contained in the donor cassette 10 are pressed on the platen roller 8. In this state, the grip roller 6 transfers the printing paper 15 in the inverse direction while rotating in the inverse direction by a separate driving source and thermal print head 9 prints a predetermined picture image on the printing paper 15. And then, the printing paper 15 is discharged into the paper box 13 by a take-out roller 11 and the discharge roller 12 through the passage 30 formed between the upper and lower guides 4 and 5. 
     In such a conventional color video printer, the printing paper 15 is not completely discharged into the paper box 13 at times, that is a phenomenon that the trailing edge of the printing paper 15 is hung over the rim portion 13a of the paper box 13 occurs frequently. In that case, since the trailing edge of the printing paper is raised upwardly, the next printing paper is caught by the previous printing paper in a continuous printing operation. In such a state, the discharge roller and the take-out roller are rotated continuously so that the picture image on the printing paper may be damaged. 
     SUMMARY OF THE INVENTION 
     Accordingly, it is an object of the present invention to provide an apparatus for discharging a printing paper for use in a color video printer which is capable of completely discharging a printing paper into a paper box by pushing the trailing edge of the printing paper with elastic members fixed on a take-out roller. 
     Another object of the present invention is to provide an apparatus for discharging a printing paper for use in a color video printer, which comprises a discharge roller, a take-out roller engaged with and driven by the discharge roller, and guide members having elastic blades fixed on the take-out roller. 
     Other objects and further scope of applicability of the present invention will become apparent from the detailed description given hereinafter. It should be understood, however, that the detailed description and specific examples, while indicating preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art from this detailed description. 
     Briefly described, the present invention relates to an apparatus for discharging a printing paper into a paper box for use in a color video printer which comprises a paper passage defined by upper and lower guides, a discharge roller provided at the outlet side of the paper passage, a take-out roller engaged with and driven by the discharge roller for discharging a printing paper into a paper box, and guide members fixed on the take-out roller for pushing the trailing edge of the printing paper into the paper box. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     The present invention will become more fully understood from the detailed description given hereinbelow and the accompanying drawings which are given by way of illustration only, and thus are not limitative of the present invention, and wherein: 
     FIG. 1 is an elevational front view showing the configuration of a conventional color video printer; 
     FIG. 2 is a detailed view of the portion &#34;A&#34; of FIG. 1; 
     FIG. 3 is a front elevational view showing the conventional discharge roller and take-out roller; 
     FIGS. 4A to 4C are views showing the discharge roller and the take-out roller according to the present invention, in which: 
     FIG. 4A is a view showing the take-out roller provide with fixing grooves for fixing guide members; 
     FIG. 4B is a view showing a state that guide members are fixed to the fixing grooves of the take-out roller; and 
     FIG. 4C is a sectional view taken along the line I--I of FIG. 4B; 
     FIG. 5 is a plane view showing the paper discharge portion according to the present invention; 
     FIGS. 6A to 6C are sectional views showing the operation of the paper discharge portion of the present invention, in which: 
     FIG. 6A is a view showing the guide member in a state that a printing paper is engaged between the discharge roller and the take-up roller; 
     FIG. 6B is a view showing the guide member in a state that the trailing edge of the printing paper is laid on the rim portion of a paper box; and 
     FIG. 6C is a view showing a state that the printing paper is inserted into the paper box by the operation of the guide member. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENTS 
     Referring now in detail to the drawings for the purpose of illustrating preferred embodiments of the present invention, the apparatus for discharging a printing paper for use in a color video printer as shown in FIGS. 4A to 4C, comprises a discharge roller 12, a take-out roller 11 which is engaged with the discharge roller 12 and is formed with fixing grooves 11a at its ends, and guide members 20 fixed to the fixing grooves 11a of the take-out roller 11. 
     The guide member 20 is made in a mould by an elastic material such as a rubber, a flexible synthetic resin or the like, and includes a tubular fixture 20a to be inserted into an fixed on the fixing groove 11a and one or more elastic blade 20b formed integrally therewith. It is preferable that the elastic blade 20b has a length enough to reach the rim portion 13a of the paper box 13. 
     In addition, it is also preferable that the tubular fixture 20a of the guide member 20 has a diameter smaller than that of the take-out roller 11 so that when the elastic blade 20b is wrapped around the tubular fixture 20a on account of the printing paper 15 being engaged between the take-out roller 11 and the discharge roller 12, the elastic blade 20b is positioned within the fixing groove 11a of the take-out roller 11, and thus does not protrude outwardly. 
     Referring to FIG. 5, there is shown a paper discharge portion in which a position sensor 19 for detecting the position of a printing paper is disposed on a corner edge of the paper box 13. As shown in FIG. 5, in a state that the printing paper 15 has not completely been inserted into the paper box 13, that is, in a state that the trailing edge of the printing paper 15 is laid on the rim portion 13a of the paper box 13, as shown in dotted line in FIG. 5, the driving force is continuously applied to the discharge roller 12 so that the take-out roller 11 which is in engagement with the discharge roller 12 rotates continuously, thereby the elastic blades 20b push the trailing edge of the printing paper 15 into the paper box 13. 
     The apparatus for discharging printing paper of the present invention operates is as follows: 
     As shown in FIGS. 6A to 6C, the printing paper 15 which is transferred along the paper passage 30 formed between the upper and lower guides 4 and 5, is engaged between the discharge roller 12 and the take-out roller 11 and discharged in the direction indicated by arrows X. That is, when the printing paper 15 is located between the take-out roller 11 and the discharge roller 12, the guide members 20 are rotated together with the take-out roller 11 and the elastic blades 20b are wrapped and extended repeatedly. When the printing paper 15 is taken out from the discharge roller 11 and the take-out roller 12 as shown in FIG. 6B, the elastic blades 20b of the guide member 20 are extended by their original elasticity and push instantly the trailing edge of the printing paper 15 so that the printing paper 15 is completely inserted into the paper box 13, as indicated in solid line in FIG. 6C. 
     When the printing paper 15 is completely inserted into the paper box 13 as described above, the position sensor 19 detected the condition and stops the rotation of the discharge roller 12 and the take-out roller 11. 
     As described above in detail, the present invention provides the effect that it is possible to completely discharge the printing paper into a paper box by providing elastic guide members at the take-out roller, thereby preventing the picture image printed on the printing paper from being discharged. 
     The invention being thus described, it will be obvious that the same may be varied in many ways. Such variations are not to be regarded as a departure from the spirit and scope of the invention, and all such modifications as would be obvious to one skilled in the art are intended to be included in the scope of the following claims.