Abstract:
A paper output structure includes a printer enclosure and a paper output extending device. The paper output extending device includes a pivot shaft, a drive gear, and a toothed bar which is capable of internal telescopic extension by means of a drive gear which includes a great gear portion and a first small gear portion. A printed sheet of paper is slightly stretched so as to be dropped uncrinkled and perfectly flat into the output tray.

Description:
BACKGROUND 
     1. Technical Field 
     The present disclosure relates to printers, particularly to a paper output structure of a printer. 
     2. Description of Related Art 
     A paper becomes weak in a printer after it is printed, especially in an ink-jet printer which can make the paper damp. When the paper is delivered to the paper output structure of the printer, the paper may be crinkled. 
     Therefore, there is room for improvement within the art. 
    
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
       Many aspects of the embodiments can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the embodiments. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views. 
         FIG. 1  is an exploded, isometric view of a paper output structure of a printer in accordance with one embodiment of the present disclosure. 
         FIG. 2  is an exploded, isometric view of an extending teeth bar of  FIG. 1 . 
         FIG. 3  is an assembled view of the structure of  FIG. 1 . 
         FIG. 4  is another assembled view of the structure of  FIG. 1 . 
     
    
    
     DETAILED DESCRIPTION 
     The disclosure is illustrated by way of example and not by way of limitation in the figures of the accompanying drawings in which like references indicate similar elements. It should be noted that references to “an” or “one” embodiment in this disclosure are not necessarily to the same embodiment, and such references mean “at least one.” 
       FIGS. 1 and 2  show a paper output structure of a printer in accordance with one embodiment. The paper output structure includes a printer enclosure  10  and a paper output shaft  30 , and a paper output extending device  50 . 
     The printer enclosure  10  includes a bottom panel  11  and two side panels  13  extending from the bottom panel  11 . The two side panels  13  are substantially perpendicular to the bottom panel and substantially parallel to each other. Each side panel  13  defines a first pivot hole  131  and a second pivot hole  133 . 
     The paper output shaft  30  includes a shaft body  31  received in the first pivot hole  131  and a plurality of paper output wheels  33 . 
     The paper output extending device  50  includes a pivot shaft  51 , two drive gears  53  mounted on the pivot shaft  51 , and two extending teeth bars  55 . 
     Each drive gear  53  includes a great gear portion  531  and two small gear portions  533  placed on opposite sides of the great gear portion  531 . 
     The extending teeth bar  55  includes a first teeth bar  551  and a second teeth bar  553 . The first teeth bar  551  defines a slot  5511 . The slot  5511  defines a main part  5513  and two sliding parts  5515  communicating with the main part  5513 . The cross section of the second teeth bar  553  is T-shaped. The second teeth bar  553  includes a teeth bar body  5531  and two sliding portions  5533  extending from the teeth bar body  5531 . The teeth bar body  5531  slides in the main part  5513  of the slot  5511  and the sliding portions  5533  slides in the sliding parts  5515 . The first teeth bar  551  includes two lines of first teeth  5517  located on opposite sides of the slot  5511 . The two lines of first teeth  5517  are arranged in a first direction. The slot extends in the first direction. The teeth bar body  5531  of the second teeth bar  553  includes a line of second teeth  5535  for engaging the great gear portion  531 . The line of second teeth  5535  is also arranged in the first direction. 
       FIG. 3  shows assembly, wherein the second teeth bar  553  corresponds to the slot  5511  of the first teeth bar  551  and the sliding portions  5533  of the second teeth bar  553  slide into the sliding parts  5515  of the slot  5511 , thereby the second teeth bar  553  is slidably mounted in the first teeth bar  551 . The pivot shaft  51  is mounted in the second pivot hole  133  of the printer enclosure  10  and the extending teeth bars  55  are placed under the paper output shaft  30  to engage the drive gear  53 . At this time, the first teeth  5517  of the first teeth  551  engage the small gear portion  533  and the second teeth  5535  of the second teeth bar  553  engage the great gear portion  531 . 
     Referring to  FIG. 4 , in use, the pivot shaft  51  of the paper output extending device  50  is rotated by a motor in a first rotation direction when a paper is ready to be output, thereby driving the drive gear  53  to rotate. The drive gear  53  drives the extending teeth bars  55  to move out. The second teeth bar  553  moves faster than the first teeth bar  551  because the diameter of the great gear portion  531  is greater than that of the small gear portion  533 , thereby the second teeth bar  553  moves relative to the first teeth bar  551 . When a paper is being output, an end of the paper is driven to be placed on the extending teeth bar  55 , thereby the extending teeth bar  55  supports the paper. The pivot shaft  51  rotates along a second rotation direction opposite to the first rotation direction to drive the extending teeth bar  55  to move inward when the paper is almost completely output. The second teeth bar  553  moves faster than the first teeth bar  551  when the greater gear portion  531  engages the second teeth bar  553 . The second teeth bar  553  moves faster than the first teeth bar  551  until the second teeth bar  553  is received in the slot  5511 . Thereby, the paper can be stretched completely flat for being placed on an paper output tray (not shown) 
     It is to be understood, however, that even though numerous characteristics and advantages of the embodiments have been set forth in the foregoing description, together with details of the structure and functions of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in the matters of shape, size, and arrangement of parts within the principles of the present disclosure to the full extent indicated by the broad general meaning of the terms in which the appended claims are expressed.