JPS62183363A - Method for feeding recording paper - Google Patents

Abstract

PURPOSE:To feed a recording paper by a constant amount even if a platen roller of different diameter is used, by a method wherein the recording paper is fed by a paper feed means and slipped on the platen roller. CONSTITUTION:A paper feed means 15 provided between a platen roller 14 and a holder 12 consits of a feed roller 16 and a pinch roller 17, and the former is driven by a drive means 18 similarly to the platen roller 14. The peripheral speed of the feed roller 16 is set to a specified speed appropriate to a printing on a recording paper 21, and the peripheral speed of the platen roller 14 is set higher than the specified speed. The coefficient of friction and the pressing force are so selected that the force of feeding the recording paper 21 by the platen roller 14 is set smaller than that by the feed roller 16, whereby the platen roller 14 slips and the recording paper 21 is fed at the same speed as the peripheral speed of the feed roller 16.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a recording paper conveyance method, and more particularly to a recording paper conveyance method in a recording section.

[Technical background of the invention]

FIG. 2 conceptually shows a conventional recording device.

In this recording device, a recording paper roll 1 is held in a holder 2, and the leading edge of the recording paper 3 fed out from the recording paper roll 1 is in pressure contact with a thermal recording pad 4 and a platen roller 5. will be waited for. This recording paper 3 is conveyed by a platen roller 5 and simultaneously recorded by a thermal recording head 4. - The recording paper 3 on which the recording of the page has been completed is cut by the auto cutter 6, and the discharge roller 7
The paper is ejected to a tray, etc. On the other hand, the unrecorded recording paper that has been cut is returned to recording by reversing the platen roller 5 until its leading edge reaches the vicinity of the recording pad 4.

Note that in FIG. 2, reference numeral 8 indicates a driving means for the platen roller 5. As shown in FIG.

[Problems with background technology]

Incidentally, in the recording apparatus described above, the amount of feed of the recording paper 3 when printing is performed by the thermal recording head 4 depends on the circumferential speed of the platen roller 5.

On the other hand, the platen roller 5 needs to press the recording paper 3 with an appropriate nip width, needs a friction coefficient higher than a predetermined value in order to convey the recording paper 3 at a specified speed, and has high durability. In order to satisfy these conditions, the outer periphery is formed of an elastic material such as rubber.

Therefore, the platen roller 5 cannot necessarily be said to be stable against heat, and its outer diameter may change due to the heat from the recording pad 4, resulting in uneven feeding of the recording paper 3. There was that.

[Purpose of the invention]

SUMMARY OF THE INVENTION In view of the above-mentioned circumstances, it is an object of the present invention to provide a recording paper conveyance method that can always keep the recording paper feeding amount constant during recording by a thermal recording head.

[Summary of the invention]

Therefore, in the present invention, a paper conveyance means is provided between the recording paper roll holder and the recording section consisting of a thermal recording head and a platen roller, and the recording paper conveyance speed by this paper conveyance means is set as required for recording. At the same time, the conveying speed of the recording paper by the platen roller is set to a speed faster than the prescribed speed, and the conveying force of the recording paper by the platen roller is set to the conveying force of the recording paper by the paper conveying means. The recording paper is slid between the platen roller and the recording paper roll and conveyed over the thermal head at a speed that depends on the paper conveyance means. The above objectives have been achieved.

[Embodiments of the invention]

The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 shows a recording apparatus for implementing the recording paper conveyance method according to the present invention.

In this recording apparatus, a recording paper roll 11 is held in a holder 12. Further, in this recording apparatus, a paper conveyance means 15 is disposed between the platen roller 14 that comes into contact with the heat-sensitive recording pad 13 and the holder 12. This paper conveying means 15 is composed of a feed roller 16 and a pinch roller 17.
6 is driven by a driving means 18 similarly to the platen roller 14.

Further, in this recording apparatus, an automatic cutter 19 and a discharge roller are disposed downstream of the platen roller 14.

In this recording apparatus, the circumferential speed of the feed roller 16 is set to a prescribed speed appropriate for printing on the recording paper 21 fed out from the recording paper roll 11, and the circumferential speed of the platen roller 14 is set to the specified speed. is set faster than the speed. Furthermore, in this recording apparatus, the platen roller 1
4 and the recording paper 21, the dynamic friction coefficient between the thermal head 13 and the recording paper 21 is μm, the pressure contact force between the thermal head 13 and the platen roller 14 is N, and the friction coefficient between the drive roller 16 and the recording paper 21 is μ0. When the load force on the pinch roller 17 is F, and the pressure force between the drive roller 16 and the pinch roller 17 is L, the friction coefficient and pressure force are selected so that μDXL+F≧(μ, −μH)N>0 μDxL>F. do. Thereby, the force of conveying the recording paper 21 by the platen roller 14 is made smaller than the force of conveying the recording paper 21 by the feed roller 16.

In the recording apparatus configured in this manner, when the recording paper 21 is conveyed by the driving force of the feed roller 16 of the sheet conveyor ff115 and the driving force of the platen roller 14, the platen roller 14 is However, as described above, the conveyance force of the recording paper 4 by the platen roller 14 is smaller than the conveyance force of the recording paper 4 by the feed roller 16, so the platen roller 14 slips, the recording paper 21 is conveyed at the same speed as the peripheral speed of the feed roller 16, and recording is performed by the recording rad 13. And -
The recording paper 21 on which the recording of pages has been completed is cut by the auto cutter 19.
The paper is cut by the machine and discharged from the device by a discharge roller.

Further, the cut unrecorded paper 21 is returned by reversing the platen roller 14 and the feed roller 16 until the leading edge reaches the vicinity of the recording pad 13.

In the above embodiment, in order to make the conveyance force of the recording paper 21 by the platen roller 14 smaller than the conveyance force of the recording paper 21 by the feed roller 16, a fluorine compound with a low coefficient of friction is applied to the outer peripheral surface of the platen roller 14. In addition, the feed roller 16 is made of metal, ceramics, or the like having a small coefficient of thermal expansion, or the roller material is coated with the material by thermal spraying or the like.

Further, in the above embodiment, the paper conveying means 15 is composed of the feed roller 16 and the pinch roller 17, but the pinch roller 17 may be replaced with a plate.

〔Effect of the invention〕

As explained above, in the recording paper transport method according to the present invention, a paper transport means is disposed between the thermal recording head and the holder of the recording paper roll, and the recording paper is transported at a speed that depends on the paper transport means. Since the platen roller and the recording paper are made to slide so that the platen roller and the recording paper slide, the recording paper feed amount does not change even if the diameter of the platen roller changes due to the heat of the thermal recording head with a simple configuration. The amount can always be kept constant.

[Brief explanation of drawings]

FIG. 1 is a conceptual diagram showing an embodiment of a recording apparatus for carrying out the recording paper transport method according to the present invention, and FIG. 2 is a conceptual diagram showing a conventional recording apparatus. 11...recording paper roll, hill...holder, 13...
Thermal recording head, 14...Platen roller, 15...
・Paper transport means, 16...Feed roller, 17...
- Pinch roller, 21...recording paper.

Claims (1)

[Claims] A paper conveying means is arranged between the recording paper roll holder and the recording section consisting of a thermal recording head and a platen roller, and the speed at which the recording paper is conveyed by this paper conveying means is set to a specified speed required for recording. At the same time, the conveyance speed of the recording paper by the platen roller is set to a speed higher than the specified speed, and the platen roller is slid against the recording paper by the difference in speed, so that the recording paper is unwound from the recording paper roll. A recording paper conveyance method characterized in that the recording paper is conveyed over the thermal recording head at a speed that depends on the paper conveyance means.