JP2554901B2 - Automatic paper feed mechanism - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an automatic paper feed mechanism for a printer that uses cut paper.

[Prior Art] A schematic configuration of a conventional automatic sheet feeding mechanism will be described with reference to FIGS. 8 and 9. As shown in FIG. 8, the recording paper P1 and the friction member 18
Is pressed against the paper feed belt 13 by the urging force of the spring members 101 and 102, and one or a plurality of recording papers P4 is moved by the friction member 18 by rotating the paper feed belt 13 in the direction of arrow E.
Be transported to. The plurality of recording papers fed are separated by the friction member 18 into a single paper, and are fed on the paper guide 17 to the paper feeding mechanism 29 in the recording device. Next paper feed belt 13
Is stopped, and the pressing of the recording paper P1 and the friction member 18 against the paper feeding belt 13 is released by a release means (not shown) as shown in FIG. The fed recording paper P3 is conveyed by the paper feeding mechanism 29 in the direction of arrow J1 and recording is started, but at this time, the paper feed belt 13 does not rotate.

[Problems to be solved by the invention]

However, the above-mentioned conventional techniques have the following problems. As shown in FIG. 9, after the feeding is completed, a plurality of recording sheets P4 are overlapped on the friction member 18, and the recording sheet P3 fed in this state is moved in the direction of arrow J1 by the sheet feeding mechanism 29. When carrying and recording, a plurality of recording papers P4 on the friction member 18 are carried by the recording paper P3 in the direction of arrow J1 due to friction between the papers, and a paper jam occurs, or when sequentially feeding paper. There was a problem such as double feeding. Further, after the recording paper P3 is ejected, when the paper drawer 3 is pulled out in the arrow X direction for replacing the recording paper in the automatic paper feeding device, the recording paper P4 on the friction member 18 is put in the automatic paper feeding device. There were problems such as being left behind.

Therefore, the present invention solves such a problem,
You can easily change the recording paper at the intended place,
The purpose is to provide a highly reliable automatic paper feed mechanism that does not cause paper jams or double feeding.

[Means for solving problems]

In the automatic paper feeding mechanism of the present invention, the recording paper fed to the paper feeding mechanism provided in the recording device by the paper feeding means such as the paper feeding roller or the paper feeding belt is conveyed in the forward direction by the paper feeding mechanism. At that time, the sheet feeding means is rotated in the reverse direction with respect to the sheet feeding direction.

〔Example〕

An embodiment of a thermal transfer printer having an automatic sheet feeding mechanism according to the present invention will be described with reference to FIGS. 1 to 7. FIG. 1 shows the appearance of a thermal transfer printer having an automatic paper feed mechanism according to the present invention. In the figure, 1 is a front panel, 2 is operation switches, 3 is a paper drawer, 4 is a film cassette door, and 5 is a stacker. , 6 are cases. FIG. 2 is a sectional view of the mechanical portion of the thermal transfer printer as viewed in the direction of arrow A in FIG. P1 is the paper stored in the paper drawer 3 before recording, and P2 is the paper stored in the stacker 7 after recording is completed. Q is an ink film, and an unused ink film Q1 is wound around the supply core 8 and a used ink film Q2 is wound around the winding core 9 and stored in the film cassette 10. The automatic paper feed mechanism includes a paper feed belt 13 spanned between a paper feed drive shaft 11 and an idle shaft 12, a hopper 14 rotatably mounted on the paper drawer 3, and a hopper 14 urged by a spring member 100. A hopper lever 15 for rotating in the direction of arrow B, a separator 16 and a friction member 18 for separating one sheet of a plurality of fed sheets, a spring member 101 for rotating the separator 16 in the direction of arrow C, and a paper guide. It is composed of 17. The hopper lever 15 is rotated in the direction of arrow D by the biasing force of the spring member 100, the hopper 14 is lifted in the direction of arrow B, and the recording paper P1 is pressed against the paper feed belt 13. At the same time, the biasing force of the spring member 101 causes the separator 16 to rotate in the direction of arrow C, and the friction member 18 mounted on the separator 16 is pressed against the paper feed belt 13. In this state, the sheet feeding drive shaft 11 is rotated in the direction of arrow E1 by a driving means (not shown) to start automatic sheet feeding. FIG. 3 shows a state in which only one sheet of paper fed from a plurality of sheets is separated. By rotating the paper feed belt 13 in the direction of arrow E1, one or more recording papers are separated by the separator 16
Will be sent to. A friction member 18 is attached to the pressing portion of the separator 16 against the paper feeding belt 13, and the friction coefficient between the paper feeding belt 13 and the paper is μ1, the friction coefficient between the paper is μ2, and the paper and the friction member 18 are. If the friction coefficient between and is μ3, μ1, μ
The relationship between 2 and μ3 is μ1>μ3> μ2.
On the friction member 18 mounted above, only one recording sheet in contact with the paper feed belt 13 is separated and sent to the paper guide 17.
Further, the recording paper separated on the friction member 18 and sent to the paper guide 17 is narrowed by the paper feed roller 19 and the paper pressing roller 20 which constitute the main paper feed mechanism as shown in FIG. After being conveyed, the rotation of the paper feed drive shaft 11 is stopped and the automatic paper feed is completed.

The recording mechanism includes a head 21, a platen 22, and pressing rollers 25 and 26 rotatably supported at both ends by levers 23 and 24.
And a fulcrum 27 of the head 21 and levers 23 and 24,
Spring members 102, 103 hooked to the head 21 and levers 23 and 24 to press the platen 22 against the pressing roller 21 and the pressing rollers 25 and 26,
104 is attached and is composed of a moving frame 28 which moves in the arrow H direction and the arrow I direction by a driving means (not shown). After the automatic paper feeding is completed, the hopper lever 15 is rotated in the direction of arrow F in FIG. 4 and the separator 16 is rotated in the direction of arrow G by a means (not shown) to press the recording paper P1 and the friction member 18 against the paper feeding belt 13. At the same time, the moving frame 28 is moved in the direction of arrow I by a driving means (not shown),
Recording preparation is completed by pressing the head 21 and the pressing rollers 25 and 16 against the platen 22.

FIG. 5 shows the start of recording. The drive roller (not shown) rotates the paper feed roller 19 in the direction of arrow K1 to convey the automatically fed recording paper P3 in the direction of arrow J1, and at the same time, the drive unit (not shown) rotates the winding core 9 in the direction of arrow N. Then, recording is performed while conveying the ink film Q in the direction of arrow M. When the supplied recording paper P3 is conveyed in the direction of arrow J1,
A plurality of recording sheets P4 sent to the friction member 18 are recording sheets.
The paper feed drive shaft 11 is rotated in the direction of arrow E2 so as not to be conveyed in the direction of arrow L due to friction with P3. In the case of color recording, the paper feed roller 19 is rotated in the arrow K1 direction during recording and in the arrow K2 direction during paper return, and the recording paper P3 is reciprocated a predetermined amount three or four times in the arrow J1 direction and the arrow J2 direction. After that, the recording paper P3 is discharged in the direction of the arrow J1, and the recording paper P3 is stored in the stacker 7 by using the own weight of the recording paper P3. After recording,
The moving frame 28 is moved in the direction of arrow H to return the mechanical body to the initial state shown in FIG. The state shown in FIG. 2 is also a mechanical state when the film cassette 10 accommodating the recording paper P1 and the ink film Q is replaced, and the moving frame 28 is sufficiently moved in the direction of the arrow I, and the head 21 and the pressing roller 25 and 26 is at a position where it does not hinder the exchange of the film cassette 10.

FIG. 6 shows a method of exchanging consumables with the mechanical portion in the state shown in FIG. To replace and replenish the recording paper P1, pull out the paper drawer 3 in the direction of arrow X, set the recording paper, and then
The paper drawer 3 is pushed again in the arrow Y direction.
The film cassette 10 can be replaced by the film cassette door 4
Open, pull out the film cassette 10 in the direction of arrow X,
The new film cassette is pushed in the direction of the arrow Y and the film cassette door 4 is closed. Also, recording paper that has been recorded
For P2, open the stacker door 5 as shown in Fig. 7 and take it out.

〔The invention's effect〕

As described above, according to the present invention, when the automatically fed recording paper is conveyed in the forward direction, the paper feeding belt is rotated in the direction opposite to the paper feeding direction. Even if the paper is conveyed in the forward direction by the main paper feeding mechanism, the plural recording sheets left on the friction member are not conveyed in the forward direction, and the double feeding and the paper jamming during the automatic feeding are prevented. In addition, when pulling out the paper drawer for exchanging and replenishing the recording paper, the paper drawer can be pulled out without leaving any one of the recording paper in the recording device, so the effect that the exchange and replenishment of the recording paper can be easily performed is expected. I can.

[Brief description of drawings]

FIG. 1 is a diagram showing the external appearance of a thermal transfer printer having an automatic paper feeding mechanism according to an embodiment of the present invention. 2 to 5 are views showing the internal structure of the thermal transfer printer provided with the automatic paper feeding mechanism in the embodiment of the present invention. FIG. 6 is a diagram showing replacement of consumables of the thermal transfer printer having the automatic paper feeding mechanism in the embodiment of the present invention. FIG. 7 is a diagram showing a method for taking out recorded paper from a thermal transfer printer having an automatic paper feeding mechanism in the embodiment of the present invention. 8 and 9 are views for explaining a conventional automatic paper feed mechanism. 1 …… Front panel 2 …… Operation switches 3 …… Paper drawer 4 …… Film cassette door 5 …… Stacker door 6 …… Case 7 …… Stacker 8 …… Supply core 9 …… Winding core 10 …… Film Cassette 11 …… Feeding drive shaft 12 …… Idle shaft 13 …… Feeding belt 14 …… Hopper 15 …… Hopper lever 16 …… Separator 17 …… Paper guide 18 …… Friction member 19 …… Paper feed roller 20… … Paper press roller 21 …… Head 22 …… Platen 23 …… Lever 24 …… Lever 25 …… Press roller 26 …… Press roller 27 …… Support point 28 …… Moving frame 29 …… Paper feed mechanism 100 …… Spring member 101: Spring member 102: Spring member 103: Spring member 104: Spring member P: Recording paper Q: Ink film

Claims (1)

(57) [Claims] 1. A plurality of recording sheets are pressed against a sheet feeding means such as at least one sheet feeding roller or a sheet feeding belt, and the recording sheets are fed one by one up to a sheet feeding mechanism provided in the recording apparatus. In an automatic paper feed mechanism for feeding paper, the paper feed means is rotated in a recording paper feed direction to feed the recording paper to the paper feed mechanism provided in the recording device, and then the recording paper is fed to the paper feed means. An automatic paper feed mechanism, characterized in that the pressing of paper is released and the paper feed means is rotated in a direction opposite to the recording paper conveyance direction.