JPS62108673A - Recording paper ejecting device - Google Patents

Abstract

PURPOSE:To eject a sheet of recording paper with a simple constitution by sandwiching the sheet of recording paper between the upper part of a clamp bar, when the bar pressing the front end of the sheet of recording paper is opened, and a paper ejecting roller so as to press the paper ejecting roller. CONSTITUTION:The dimension of the sheet of recording paper 5 is formed a little longer than the circumference of a drum, and the titled device is constituted so that the rear end of the sheet of recording paper 5 is positioned just over a clamp bar 2 when the front end of the sheet of recording paper is pressed with the clamp bar 2. When a recording on the sheet of recording paper 5 is completed and the sheet of the recording paper 5 is ejected, a cam 3 is rotated by 180 deg. and the clamp bar 2 is pressed up with a lever 4. By pressing up the bar, the outside 2a of the bar 2 sandwiches the rear end part of the sheet of recording paper 5 and presses up a paper ejecting roller 16, and thereby, a recording paper pressing roller 17 is pushed away from the drum, and also, the sheet of recording paper 5 from which a clamping is eliminated is ejected with the rotation of the paper ejecting roller 16 in a counterclockwise direction.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a recording paper ejection device of a recording apparatus having a function of automatically attaching and removing recording paper to a drum.

2. Description of the Related Art A conventional apparatus of this kind is a conventional apparatus in which the leading edge of a recording paper 31 fed from a mounting table 30 is clamped by a holding means 32 and a drum 33 is rotated counterclockwise, as shown in FIG. 5 (at). ,
The recording paper 31 is wound around the drum 33 by the pinch roller 34 which is in contact with the drum 33 and is moved to the drum 33. After recording is completed, when the recording paper 33 is reversed clockwise at a predetermined position as shown in FIG. The recording paper was then ejected by advancing to the mounting table 30+ (for example, in Japanese Patent Laid-Open No. 59-1
71676).

Alternatively, as shown in FIG. 6, after recording is completed, the drum 39 is stopped at a predetermined position, the clamp by the bar 36 is released,
By displacing the bottle 1,000 liters] - 3τ to :37 to apply a pressing force to the drum, this pinch roller 37 is driven to rotate clockwise, and the recording paper 38 is ejected in the direction of the arrow by the frictional force on its outer periphery. (For example, JP-A-50-13
5915).

Problems to be Solved by the Invention However, in the former case, a control means for reversing the drum at a predetermined position is required, which complicates the construction accordingly. In addition, in the case of paper ejecting means that utilizes the lifting of the trailing edge due to the rigidity of the recording paper, in the case of recording paper with low rigidity, the trailing edge may come into close contact with the drum due to static electricity, etc. Paper ejection becomes unstable. In the latter case, for example, if the drum is used as a platen in a thermal printer and the outer periphery is made of comb material, etc., the friction between the recording paper and the drum will be great, so the ejection force by the pinch roller will be reduced. , there are problems such as unstable discharge action.

The present invention was made in view of the above-mentioned problems, and eliminates the need for reversing the drum, and improves the rigidity of the recording paper.
It is an object of the present invention to provide a recording paper ejecting device that is independent of the material of the outer periphery of a drum.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention makes the circumference of the drum shorter than the length of the recording paper so that the trailing edge of the recording paper when wound around the drum is extends over the front end clamp bar;
When the drum stops at a position where the bar can be opened and closed, a paper ejection roller supported by a pair of arms that can pivot about one end is positioned directly above the bar, and is also attached to the arm. A supported paper holding roller contacts the outer periphery of the drum at the front in the direction of rotation of the drum near the paper ejection roller, and the paper ejection roller is maintained at a constant distance from the bar by contact with the bar. It is.

According to the above-described structure, when the drum around which the recording paper is wound stops at a predetermined position and the bar is opened, the front end of the recording paper is unclamped, and the upper part of the bar holds the rear end of the recording paper. Push up the paper ejection roller while holding it between the paper ejection rollers.

Therefore, the trailing edge of the recording paper is separated from the drum regardless of the rigidity of the recording paper.

Since the paper press roller is separated from the drum as the two feet are pushed up, there is no friction between the drum and the recording paper when the paper is ejected, even if the outer periphery of the drum is made of rubber. Here,
When rotation in the recording paper rewinding direction is input to the paper discharge roller, the trailing edge of the recording paper advances to the paper discharge guide path and the paper is ejected, so there is no need to rotate the drum in the reverse direction.

Embodiment FIG. 1 shows a thermal transfer type recording apparatus to which a recording paper discharge device according to an embodiment of the present invention is applied, in which 16 and 7 are drums whose outer periphery is made of comb material, and 2 is a drum that clamps the front end of the recording paper. A force is constantly applied toward the center of the drum, and only when the drum is stopped at the position shown in the figure can it be moved up and down by the operation of the lever 4 caused by the rotation of the cam 3. Reference numeral 5 denotes recording paper, which has a size such that its rear end can cover the row side 2a of the bar 2 when it is wound around the drum 1. 6 is a thermal head, which is always given a force toward the center of the drum, and when recording, the recording paper 5
, the transfer film 7 is sandwiched and pressed against the drum surface, and is separated from the drum surface by the rotation of the cam 8 and the displacement of the lever 9 except during recording. 10 is a supply reel for the transfer film 7, 11 is a take-up reel, and 12 is a - for the recording paper 5.
13 is a paper feed roller of an automatic paper feed section that separates and feeds the recording paper 5 one by one toward the drum 1; and 14 is a recording paper ejection table that also serves as a lid of the recording paper storage box 15. Reference numeral 16 denotes a paper ejection roller whose outer periphery is made of a high-friction gong for removing the recording paper from the drum during paper ejection, and 17 a paper ejection roller that prevents the trailing edge of the recording paper from shifting due to paper floating when the drum is stopped.

A recording paper pressing roller 18 is a discharge roller for guiding the recording paper 5 to a discharge table 14'' in cooperation with a pressing spring plate 19. The following description will be given with reference to FIG. 2, which is a plan view. The paper ejection roller 16 has its shaft connected to the ejection roller $11.
+ 20 / One end of this is supported by a pair of art 21 which is rotatably supported, and the counterclockwise rotation of the paper ejection rollers l1ql12o is transmitted through a pair of hels I and 22. The recording paper presser roller 17 is also rotatably supported by an electric motor 21. 23 is a motor, which drives the ejection roller 18 counterclockwise via a gear train 24. 25 is a paper discharge guide plate, and a paper discharge path 26 is provided between the arm 21 and the paper discharge guide plate 25.
is formed.

The recording paper ejecting device configured as above (the operation thereof will be explained below).

FIG. 3 and FIG. 4 are operation explanatory diagrams.

In FIG. 3, the paper feed command (paper feed from this [cola 13 rotates, the topmost recording paper 5 is fed from the recording paper stack 12, and its front end is pushed up by the action of the cam 3 and the lever 4). When the bar 2 enters the opening of the bar 2, an entry detection control means (not shown) operates, and the cam 3 first rotates.As a result, the lever 4 is displaced to the position shown in FIG. is closed and the front end of the recording paper is clamped, and the recording paper presser roller 17, which had been kept away from the drum 1 from the outside 2al of the bar, comes into contact with the drum 1, and then the rotation of the drum 1 is stopped. This rotation causes the recording paper 5 to be wound around the drum 1. When the bar 2 reaches a predetermined position past the recording section 6a of the round head 6, the cam 8 rotates 180 degrees and the lever 9 causes the recording paper 5 to be wound around the drum 1. The released thermal head 6 moves toward the center of the drum 1, and as shown in FIG. 1, the recording section 6a presses the film 7 and the recording paper 5 against the drum, and recording begins.

FIG. 1 shows a state in which the drum 1 has made exactly one revolution after the start of the right-handed operation.

When recording is completed, the cam 8 is rotated 1800 times as shown in FIG. 4 by a control means (not shown), the thermal head 6 is moved away from the drum 1 by the lever 9, and then the drum is stopped at a predetermined position. \-.

The cam 3 is rotated 18 (f), and the bar 2 is pushed up by the lever 4. This push-up causes the outer side 2a of the bar 2 to eject the paper through the rear end of the recording paper 5. The presser roller 17 is moved away from the drums 1 and 1, and the recording paper 5, whose front end clamp has not been released, is loosened from being wound around the drum 1.

The rear end of the recording paper 5 is connected to an arm 21 and a recording paper pressing roller 17.
, is subjected to a pressing force by the paper ejection roller 16 due to the weight of the paper ejection roller 16 and the like.

Here, the motor 23 (FIG. 2) is commanded to rotate, and the discharge roller 18 and paper discharge roller 17 rotate counterclockwise. The paper ejection roller I7 advances the rear end of the recording paper 5 toward the paper ejection path 26 by the frictional force of its outer periphery, and the paper ejection roller 18.
J-The recording paper 5 is pushed in the direction of arrow 27 by the pressing spring plate 19.
The whole is discharged onto the discharge table 14.

Effects of the Invention As is clear from the above description, the present invention makes the circumferential length of the drum smaller than the length of the recording paper so that the trailing edge of the recording paper when wound around the drum is 10 pages/1. - When the bar is opened, the trailing edge of the recording paper is held between the outside and the paper ejection roller, and the paper ejection roller is rotated after the paper press roller is separated from the drum. This has the effect of being able to solve problems caused by the rotation of the drum, the rigidity of the recording paper, the material of the outer periphery of the drum, etc.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of a recording apparatus to which a recording paper ejection device according to an embodiment of the present invention is applied, FIG. 2 is a plan view of the paper ejection and ejection roller periphery in FIG. 5(ar) and 5(b'+ are schematic configuration and operation explanatory diagrams of a conventional recording paper discharging device, and FIG. 6 is a schematic configuration and operational diagram of another conventional recording paper discharging device. It is an explanatory diagram of the operation. 1... Drum, 2... Bar for clamping the front end of recording paper,
5... Recording paper, 16... Paper ejection roller, 17... Recording paper presser, 18 - Ejection roller, 19... Pressing spring plate, 20... First, output roller shaft, 21 Arm ,
22... Belt, 23... Motor, 26... Paper discharge path.

Claims (1)

[Claims] a rotatable drum for winding a recording paper of a certain size; a bar for clamping the front end of the recording paper between the outer periphery of the drum over the entire length of the drum; A device that can be opened and closed on the outer periphery of the drum when it is closed, clamps the front end when it is closed, and releases the clamp when it is opened, and when it is wound around the drum. a drum having a circumferential length determined such that the rear end of the recording paper overlaps the front end of the recording paper outside the clamp portion of the bar; A pair of arms are rotatably supported by a shaft with the bar as a fulcrum, and both ends of the shaft are rotatably supported at the other end of the arm, and when the bar is in the closed position, it presses against the drum surface. When the paper holding roller, the paper ejection roller whose both ends are supported by the arm between the rotating support section and the recording paper holding roller and are driven by rotational input, and the bar are in the open position, the above-mentioned means for the outside of the clamp part of the bar to push up the paper ejection roller; and this pushing up to separate the recording paper pressing roller from the drum; A recording paper discharge device comprising means for holding a recording paper and rotating a paper discharge roller to advance the trailing edge in one direction.