JPH04144877A - Recording paper discharge device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a recording paper ejection device in a recording apparatus that uses rolled recording paper, such as a facsimile, a printer, and a copying machine.

(Prior Art) Conventionally, in a facsimile machine 21, for example, which includes a recording device that uses rolled recording paper as shown in FIG.
There was a problem that 3 was curled up. This is because rolled recording paper is normally used after a long period of time has passed after being manufactured at a factory, so it develops curls during that time. , the portion wound near the paper tube has a strong curl. Therefore, when a portion of the recording paper with a reduced remaining amount is ejected, it becomes almost impossible to properly stack it on the tray.

(Problems to be Solved by the Invention) The present invention solves the problems of the prior art as described above, and aims to correct the curl caused by the curl of the rolled recording paper at the ejection section of the recording device, so that the tray is properly placed. It is an object of the present invention to provide a recording paper ejecting device in which recording paper is stacked.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a paper sheet that is installed in the recording paper ejection section of a recording device that uses rolled recording paper, and that has a partially convex shape and a smooth surface. A configuration that includes a recording paper guide member having a bent portion serving as a guide surface, and a belt that conveys the recording paper by pressing the recording paper against the convex bent portion and sliding it to correct curling. shall be.

It is effective for the convex bent portion to have an angle of 90° or less between the entrance surface and the exit surface of the recording paper, and
The configuration is further provided with a recording paper detection means, and the drive of the belt is controlled by the recording paper detection signal. Alternatively, means is further provided to apply negative pressure to the back side of the recording paper conveyance section of the belt, so that control of negative pressure on the back side of the belt and negative pressure release is synchronized with driving and stopping operations of the belt.

(Function) According to the above configuration, when the recorded recording paper is ejected,
The recording paper is strongly pressed against the convex bent portion of the guide member by the belt and is squeezed in a state where it is bent in the opposite direction to the curl, so that the curl is corrected and the recording paper is discharged.

Therefore, the tray is loaded correctly.

(Example) Hereinafter, embodiments will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which numeral 1 denotes a recording apparatus that uses a roll of recording paper (hereinafter referred to as roll paper) 2. As shown in FIG. The roll paper 2 is thermal recording paper here,
It is wound around a paper tube 3, and the printed surface is the outside surface of the roll. 4 is a thermal head, and 5 is a platen roller. When recording necessary information on recording paper, the thermal head 4 is brought into pressure contact with the platen roller 5 via the recording paper 2a pulled out from the roll paper 2, and a stepping motor (not shown) is used. While conveying the recording paper 2a by the platen roller 5 driven by the recording paper 2a, a print signal is given to the thermal head 4 in synchronization with the recording paper 2a, and recording is performed sequentially.

Reference numeral 6 denotes a cutter, which operates when a series of recording is completed and cuts the recording paper 2a. 7 is a pair of paper ejection rollers.

The roll paper 2 usually takes a certain period of time after it is manufactured at a factory until it is used. Therefore, a curling habit is formed during that time. In order to remove this, the recording paper 2a pulled out from the roll paper 2 is first conveyed by a decurling roller 8 while being bent in a direction opposite to the curling direction, and then sent to the printing section. However, in reality, it is not very effective, and the paper is printed while retaining its curl, and is ejected by the paper ejection roller pair 7.

Reference numeral 8 denotes a guide member that guides the recorded recording paper discharged by the pair of paper discharge rollers 7, and a part of the guide member has a convex curved surface that is very smooth and serves as a guide surface with low frictional resistance. It has a section 8a. This bent portion 8a is
As shown in FIG. 2, the angle θ formed by the entrance surface and the exit surface of the recording paper is an acute angle of 90° or less. Reference numeral 9 denotes a belt that conveys the recording paper by pressing and sliding the recording paper against at least the convex bent portion 8a of the guide member 8, and is circulated in the direction of the arrow by a driving roller 10 and driven rollers 11 and 12. Moving. The belt 9 is made of a flexible and highly elastic material such as urethane rubber, silicone rubber, etc. whose outer peripheral surface produces a large frictional force when it comes into contact with the back surface of the recording paper. 13 is the guide member 8
This is a recording paper detection switch attached to the recording paper detection switch, and outputs a detection signal when the leading edge of the recording paper is detected by the actuator 13a. Note that the conveyance distance from the paper ejection roller pair 7 to the actuator 13a is set shorter than the minimum length of the recording paper to be cut after printing. The guide member 8, the belt 9, its driving portion, the detection switch 13, and the like constitute the recording paper ejecting device of the present invention.

Reference numeral 14 denotes a paper ejection tray, and as shown in FIG. 3, ribs 14a are provided on both sides of the central portion, the height of which gradually increases toward the leading edge in the direction of movement of the ejected recording paper. . Reference numeral 15 denotes a presser bar that presses the recording paper discharged onto the paper discharge tray 14, around the middle of the two ribs 14a.

Next, the operation of this embodiment will be explained. The recording paper discharged by the pair of paper discharge rollers 7 is guided between the guide member 8 and the belt 9, and when its leading edge hits the actuator 13a of the recording paper detection switch 13, the detection switch 13 is activated and outputs a detection signal. do. The detection signal starts a transport motor (not shown), and the drive roller 10 starts rotating.
Belt 9 begins its circular movement. The recording paper is conveyed by the frictional force of the belt 9 and guided to the bent portion 8a. At this bending portion 8a, the recording paper is strongly pressed against the bending portion by the belt 9, and is ejected to the paper ejection tray 14 while being bent in a direction opposite to the curl and being squeezed.

Note that the rear end of the recording paper is located at the actuator 1 of the transport motor.
After passing through 3a, the drive continues for a predetermined time and then stops.

In this embodiment configured as described above, the recording paper with the curl is squeezed in the direction opposite to the curl by the bent portion 8a provided on the guide member, so that the curl is corrected and the paper is ejected. Ru. Furthermore, the recording paper discharged to the paper discharge tray 14 is supported by the ribs 14a on both sides in the width direction, and its central portion is pushed down by the presser bar 15, so that the recording paper is given stiffness and, therefore, the recording paper is are stacked in a stable state without curling on the paper discharge tray 14 as in the conventional case.

Note that a great correction effect can be obtained by making the angle θ between the recording paper entrance surface and the exit surface of the bent portion 8a an acute angle of 90 degrees or less.

In FIG. 1, a chamber is provided on the back side of the recording paper transport section of the belt 9, and means (not shown) for creating a negative pressure in this chamber are provided.

The belt 9 is divided into a plurality of belts in the width direction, and a large number of holes are provided in the chamber wall corresponding to the gaps between the belts to draw air from the belt surface side. Further, the negative pressure means is controlled by a detection signal from the detection switch 13, and is configured to create and release negative pressure in the chamber in synchronization with driving and stopping operations of the belt.

With this configuration, since the recording paper is conveyed in close contact with the belt 9, the reliability of conveyance is significantly increased.

In the above embodiment, a recording apparatus using thermal recording paper as the roll paper was described, but the invention is not limited to this, and other recording methods using roll paper, such as a thermal transfer method or an electrostatic recording method, may be used. The present invention can also be applied to recording devices such as the following.

(Effects of the Invention) As described above, according to the present invention, the curl of the roll paper is corrected at the discharge section, so that the paper can be normally stacked on the paper discharge tray.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of an embodiment of the present invention, FIG. 2 is a sectional view of a bent portion of a guide member, FIG. 3 is a perspective view of a paper ejection tray, and FIG. 4 is a conventional ejection tray. FIG. 3 is a diagram showing a curled state of recording paper. 1...Recording device, 2...Roll paper, 4.
...Thermal head, 5 ...Platen roller, 8
...Guide member, 8a...Bending portion, 9...
Belt, 13... Recording paper detection switch. Patent Applicant Rico Co., Ltd. Agent Hisashi Hoshino Figure 1

Claims (6)

[Claims] (1) A recording paper guide member installed in a recording paper ejection section of a recording device that uses a roll of recording paper, and having a partially convex bent portion with a smooth guide surface; What is claimed is: 1. A recording paper discharging device comprising: a belt that transports the recording paper in a manner that presses and slides the recording paper on a bent portion of the shape of the belt to correct curling of the recording paper. (2) Claim (1) characterized in that the convex bent portion has an angle of 90° or less between the entrance surface and the exit surface of the recording paper.
) recording paper ejection device. (3) A recording paper discharge device having the configuration according to claim (1), further comprising recording paper detection means. (4) The recording paper discharge device according to claim 3, wherein the recording paper detection means controls the drive of the belt based on the recording paper detection signal. (5) A recording paper discharging device according to claim (4), further comprising means for applying a negative pressure to the back side of the recording paper conveyance section of the belt. (6) The recording paper discharge device according to claim (5), wherein control of negative pressure on the back side of the belt and release of negative pressure by the negative pressure means is synchronized with driving and stopping operations of the belt.