JPS6031982A - Paper-discharging mechanism - Google Patents

Abstract

PURPOSE:To prevent a printing paper from being stained or damaged, by a method wherein a paper-discharging roller part discharges a paper in conjunction with a paper-feeding action while being oscillated, in a printer. CONSTITUTION:When a paper-feeding mechanism rests, levers 51 are lifted up to the side of stoppers 54 against springs 52 by frictional forces between a driving roller 11 and a printing paper 7 and between driven rollers 24 and the paper 7 and by a driving force of a motor 4, the motor 4 is stopped by an operation of a detector 55, the levers 51 are supported, and since neither of the rollers 11, 24 slide against the paper 7, the paper is prevented from being stained or broken. When the paper-feeding mechanism is operated and the paper 7 is let out, the levers 51 are oscillated in the direction of the stoppers 53 by being pulled by the springs 52, driving of the motor 4 is started by a signal from the detector 55, and the paper is discharged by the rotation of a roller assembly 1 and an idler assembly 2. In this case, a buffer corresponding to the oscillating distance can be imparted to the drive of the motor 4, so that the paper is prevented from jamming due to sagging and from being broken due to over-tensioning.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a paper ejection mechanism that ejects printing paper fed from a paper feed mechanism of a printer to the outside of a device housing.

Conventionally, this type of paper ejecting mechanism has a driving row 211 . A roller assembly 1 consisting of a driving gear 12, a driven pulley 13, and a driven roller 21. Driven gear 22. Connection shaft 23. It is comprised of an idler assembly 2 consisting of a holding plate 24, a drive belt 3, a motor 4, paper guides 5 and 6, and a paper feed mechanism 8.

The printing paper 7 fed out by the paper feeding mechanism 8 is guided by the paper guides 5 and 6, is held between a drive roller 11 and a driven roller 12, and is ejected from the apparatus housing by the drive of the motor 4.

Normally, a printer feeds paper intermittently based on commands from a host device, so when the paper feeding operation is paused, the drive roller 11 and driven roller 12 are rotated slidingly relative to the printing paper 7. Please leave paper feed mechanism 8
It is necessary to control the drive body stop of the motor 4 in response to the drive signal. If the driving roller 11 and the driven roller 12 are rotated slidingly relative to the printing paper 7 while the paper feeding operation is at rest, there is a drawback that the portion of the printing paper 7 that is in contact with the roller becomes dirty or torn. Ta.

In addition, the drive roller 1] and the driven roller 12 wear out in a short period of time.
The drawback was that it deteriorated and maintenance costs were high.

Furthermore, the driving roller 1 is provided with an appropriate frictional force necessary for ejecting the printing paper and a low frictional force when performing sliding rotation.
1 and the driven roller 12, special materials and adjustments are required, resulting in high costs.

When controlling the drive and pause of the motor 4 by receiving all the drive signals from the paper feed mechanism 8, the paper feed drive signal usually repeats irregular intermittent interruptions, so the paper feed mechanism! In order to prevent the print paper from jamming due to slack or tearing due to excessive tension between the 1II8 and the paper ejection mechanism, a complicated mechanism and precision similar to the paper feed mechanism were required, and the manufacturing cost was high. .

By making the paper ejection roller swingable, the present invention has a buffer corresponding to the swinging distance of the ejection roller to absorb printing paper fed out due to irregular intermittent paper feeding operations and pauses of the paper feeding mechanism. The present invention provides a paper ejecting mechanism that eliminates the above-mentioned drawbacks by ejecting printing paper from a paper feed mechanism.

Next, the present invention will be described in detail with reference to the drawings showing one embodiment of the present invention.

Referring to FIG. 3, one embodiment of the present invention includes a drive roller 1
1, and a drive gear 12. A roller assembly 1 consisting of a driven pulley 13 and a driven roller 24. Driven gear 22. An idler assembly 2 consisting of a connecting shaft 25 and a roller assembly 11. A pair of levers 51a and 51b that hold the drive pulley 42 and can swing around shafts 56a and 56b, a pair of springs 52-a and 52-b that bias the levers 51a and 51b in the paper ejection direction, and a lever. 51-a,
51- Stopper 5 that limits the swing range of each
3-a, 53-k), 54-a, 54-b, and motor 4
a detector 55 for obtaining a drive signal, and a motor pulley 41 for transmitting power. Drive pulley 42 and belt 3
1.32 years.

Next, the operation will be explained with reference to FIG. When the paper feeding mechanism stops, the lever 51 is lifted toward the stopper 54 against the tension of the spring 52 due to the frictional force between the driving roller 11, the driven roller 24, and the printing paper 7, and the driving force of the motor 4.
The motor 4 stops driving in response to a signal from the detector 55 which activates the detector 55, and the lever 51 is held at the dashed line in FIG. Next, when the paper feeding mechanism operates and the printing paper 7 is fed out, the lever 51 is pulled by the spring 52.
The motor 4 swings in the direction of the stopper 53 and starts driving in response to a signal from the detector 55, and the roller assembly 1 and idler assembly 2 are rotated.
As the printing paper 7 rotates, the printing paper 7 is discharged to the outside of the device housing.

In the above operation, when the paper feeding operation is paused, the motor 4 is stopped, so the drive roller 11. Since the driven roller 24 does not rotate smoothly relative to the printing paper 7, the printing paper will not be soiled or torn, and even if the paper feeding mechanism irregularly intermittents the paper feeding operation, it will not rotate smoothly between the stoppers 53 and 54. The drive of the motor 4 can be buffered in response to the paper feed signal by the distance that the lever 51 swings, so that the printing paper will not become jammed due to sagging or be torn due to excessive tension.・ 5-Furthermore, when the paper feeding operation is stopped [-, the drive unit is also stopped, so there is less wear and deterioration, and the drive roller 1
1. A paper ejection mechanism that does not require special materials or adjustments for smooth rotation of the driven roller 24 and the printing paper 7, is low cost, and is easy to assemble can be obtained.

As explained above, in the present invention, the paper ejection roller section
By ejecting paper in conjunction with the paper feed operation instead of swinging, the paper ejection mechanism does not stain or tear the printing paper, has a long life, is low cost, and is easy to assemble. can get.

[Brief explanation of the drawing]

FIG. 1 is a side view schematically showing a conventional paper ejection mechanism;
FIG. 2 is a perspective view showing details of the main part of FIG. 1, FIG. 3 is a perspective view showing an embodiment of the present invention, and FIG. 4 is a side view showing details of the main part of FIG. be. 1... Roller assembly, 2... Idler assembly, 4... Motor, 11... Drive roller, 24... Driven roller, 51 lever, 5
5 Detector. Convex Agent Patent Attorney Susumu Uchihara 74 Kaisho GO-31982 (3)

Claims (1)

[Claims] a pair of roller parts that sandwich the printing paper fed out from the paper feed mechanism; means for holding the roller parts so as to be swingable in the running direction of the printing paper; and a limiting means for limiting the movable range of the roller parts. , comprising a detector for detecting that the roller section is biased toward one side of the limiting means, and a motor for rotationally driving the roller section, and controlling drive of the motor by a signal from the detector. Features a paper ejection mechanism.