JPS6241148A - Printer - Google Patents

Abstract

PURPOSE:To enable a blank to be inserted without opening and closing a veil roller by fixing the veil roller to a veil roller shaft to be located between ribs. CONSTITUTION:When a platen gear 20 is driven, a veil roller shaft 16 and a veil roller 17 are rotated through a veil gear 18. Since the veil roller 17 overlaps somewhat a rib 12, friction acts between a blank 13 and the veil roller 17 and the blank 13 is sent with its rigidity by the rotation of the veil roller 17. Thus, even if the lower end of the blank 13 leaves a platen 10, the blank 13 can be pulled up to the last. Also, since the veil roller 17 is not pressed against the platen 10, a friction roller 23 and the veil roller 17 are spaced from each other by a predetermined distance. Thus, the leading end of the blank 13 guided to a blank guide portion 14a of a top cover 14 in inserting the blank is easily introduced onto ribs 12 and inserted automatically between the rib 12 and the veil roller 17 by the rotation of the veil roller 17.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to printers, and more particularly to bail roller mechanisms.

[Prior Art] In a type of printer in which the printer is rotationally driven to feed paper, a bail roller mechanism is provided so that the paper can be pulled up to the end even if the bottom edge of the paper comes off the platen.

FIG. 4 is a schematic side view of a printer equipped with a conventional bail roller mechanism. A friction roller 3 and a leaf spring 4 are arranged below the printing section so that the paper 2 is brought into pressure contact with the platen l which is driven at 0 rotations. A bail roller 5 is disposed above the printing section. The bail roller 5 is a fulcrum shaft 6
A fixed shaft 8 fixed to a lever 7 swingably supported on the
It is rotatably mounted on the

Therefore, normally when the platen 1 is rotated, the friction roller 3° and the bail roller 5 cooperate with the platen 1 to feed the paper 2. Then, printing is performed on the paper 2 one after another, and the bottom edge of the paper 2 is moved to the friction roller 5. 3, the lower end of the paper 2 separates from the platen l, but the leaf spring 4
Since the paper 2 is pulled up to the end by the action of the bail roller 5, it is possible to print up to the bottom edge of the paper 2.

Therefore, there are few restrictions on the printing layout, and for example, a "page" can be printed at the bottom of the paper 2.

[Problems to be Solved by the Invention] Since the bail roller 5 is in pressure contact with the platen L, when inserting the paper 2, when the bail roller 5 is in pressure contact with the platen 1, there is a gap between the platen L and the bail roller 5. It is difficult to insert paper 2. Therefore, when inserting paper, it is necessary to swing the lever 7 to open and close the bail roller 5, making the operation complicated. To insert it automatically again.

It is necessary to swing the lever 7 using a solenoid or the like, which poses a problem of high cost.

SUMMARY OF THE INVENTION An object of the present invention is to provide a printer in which paper can be inserted without opening or closing the pail opening, and which can print to the bottom edge of the paper.

[Means for Solving the Problems] The structure of the present invention for solving the problems of the above-mentioned prior art will be explained with reference to FIGS. 1, 2, and 3 corresponding to embodiments. A case 11 located above the platen 10 is provided with a plurality of ribs 12. A top cover 14 is provided above the rib 12 and has a paper guide portion 14a for guiding the paper 13 to the rib 12. A bail roller shaft 16 is rotatably provided on the top cover 14 so as to be positioned above the ribs 12, and a bail roller 17 is fixed to the bail roller shaft 16 so as to be positioned between the ribs 12. A bail gear 18 is fixed to one end of the bail roller shaft 16, and this bail gear 18 is connected to the platen shaft 19 of the platen 10.
It meshes with a platen gear 20 fixed to.

[Example] An example of the present invention will be described below with reference to FIGS. 1, 2, and 3. Case 1 located on the E side of the platen 10
1 is provided with a plurality of ribs 12. This rib 12
A top cover 14 is formed with a paper guide portion 14a for guiding the paper 13 to the ribs 12 above, and is attached to a support shaft 15.
It is provided so that it can swing freely around the center. A bail roller shaft 16 is rotatably provided on the top cover 14 so as to be positioned above the ribs 12, and a bail roller 17 is fixed to the bail roller shaft 16 so as to be positioned between the ribs 12. A pale gear 18 is fixed to one end of the bail roller shaft 16, and this pale gear 18 meshes with a platen gear 20 fixed to a platen shaft 19 of the platen 10. Here, when the pale gear 18 is engaged with the platen gear 20, the rib 12 and the bail roller 17 are designed to slightly overlap. In addition, in Figure 1, 21 is the print head,
221f plate/<ne, 23 indicates a friction roller.

Next, the effect will be explained. When the platen gear 2° is driven by means not shown, the bail roller shaft 16 and the bail roller 17 are rotated via the pail gear 18. As described above, since the bail roller 17 slightly overlaps the rib 12, friction acts between the paper 13 and the bail roller 17, and the rotation of the bail roller 17 causes the paper 13 to be fed by its rigidity. Therefore, paper 1
Even if the lower end of the sheet 3 separates from the platen 10, the sheet 13 can be pulled to the end.

Further, since the bail roller 17 is not in pressure contact with the platen 10, a constant distance is maintained between the friction roller 23 and the bail roller 17. Therefore.

Top force when inserting paper /, < -14 paper guide section 1
The leading edge of the paper 13 guided by the rib 12-
)-, and the rib 1 is guided by the rotation of the bail roller 17.
2 and bail roller 1711JI automatically.

[Effects of the Invention] As is clear from the following explanation, according to the present invention, paper can be automatically inserted without opening or closing the bail roller.

[Brief explanation of drawings]

Figure i1 is a partially cutaway schematic perspective view showing an embodiment of the present invention, Figure 2 is a side sectional view of Figure 1, Figure 3 is an explanatory diagram showing the relationship between the ribs and the bail roller, and Figure 4 is a schematic perspective view showing an embodiment of the present invention. FIG. 2 is a diagram explaining the principle of a conventional example. lO Nibraten. ll: case, 12: rib. 13: Paper, 14 Nidotsubu cover. 14a: Paper guide section, 16: Bail roller shaft, 17: Bail roller, 18: Pail gear, 19 Nibra ten shaft, 20 Nibra ten gear. Figure 3 Figure 4

Claims (1)

[Claims] A top cover includes a plurality of ribs provided on a part of the case located above the rotationally driven platen, and a paper guide section provided corresponding to the ribs to guide the paper toward the ribs. , a bail roller shaft rotatably provided on the top cover in correspondence with the ribs, a bail roller fixed to the bail roller shaft so as to be located between the ribs, and the bail roller so as to mesh with a platen gear of the platen. A printer characterized in that it is equipped with a bail gear fixed to a shaft.