JPH0380387B2 - - Google Patents

Description

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

BACKGROUND ART As shown in FIG. 5a, in a conventional device of this type, when a recording paper 31 fed from a mounting table 30 is clamped at its leading end by a holding means 32 and a drum 33 is rotated counterclockwise, the drum 33 is rotated counterclockwise. The recording paper 31 is wound around the drum 33 by the pinch roller 34 that is in contact with the drum 33 . After recording is completed, when the drum 33 is rotated clockwise at a predetermined position as shown in FIG. 30
The recording paper was ejected by advancing upward (for example, Japanese Patent Laid-Open No. 171676/1983).

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, and the pinch roller 37' is displaced to 37 to apply a pressing force to the drum. 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, Japanese Patent Laid-Open No. 135915/1982).

Problems to be Solved by the Invention However, according to this configuration, in the former case,
A control means is required to reverse the drum at a predetermined position, and the configuration becomes complicated accordingly. In addition, paper ejecting means that utilizes the lifting of the trailing edge due to the rigidity of the recording paper may cause the trailing edge to come into close contact with the drum due to static electricity if the recording paper is of low rigidity. 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 rubber, the friction between the recording paper and the drum will be large, 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 does not require reversing the drum.
It is an object of the present invention to provide a recording paper ejecting device that is not related to the rigidity of the recording paper or the material of the outer periphery of the 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 The front end is extended over the clamp bar, and when the drum is stopped at a position where the bar can be opened and closed, a paper ejection roller supported by a pair of arms that can pivot with one end as a fulcrum is positioned directly above the bar. Also, the paper holding roller, which is also supported by the above arm, comes into contact with the outer periphery of the drum at the front in the direction of rotation of the drum near the paper ejection roller, and this contact causes the paper ejection roller to maintain a certain distance from the bar. It has a structure that allows it to be maintained with.

Operation 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 clamp at the front end of the recording paper is released, and the upper part of the bar is moved to the rear end of the recording paper. Push up the paper ejection roller while holding the sheet between the paper ejection roller and the paper ejection roller. Therefore, the trailing edge of the recording paper is pulled away from the drum regardless of the rigidity of the recording paper. Furthermore, since the paper pressing roller is separated from the drum as the paper is pushed up, no friction occurs between the drum and the recording paper during paper ejection, even if the outer periphery of the drum is made of rubber. Here, when rotation in the rewinding direction of the recording paper is input to the paper ejection roller, the trailing edge of the recording paper advances to the paper ejection guide path and the paper is ejected, so there is no need to reverse the drum.

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.
is a drum whose outer periphery is made of rubber, and 2 is a bar that clamps the front end of the recording paper. A force is always applied toward the center of the drum, and cam 3 rotates only when the drum is stopped at the position shown in the figure. It can be moved up and down by operating the lever 4. Reference numeral 5 denotes recording paper, which has a size such that its rear end can cover the outside 2a of the bar 2 when it is wound around the drum 1. Reference numeral 6 denotes a thermal head, which is always applied with force in the direction of the center of the drum. During recording, it presses the drum surface across the recording paper 5 and transfer film 7, and when not recording, it presses the drum surface through the rotation of cam 8 and lever 9. is separated from the drum surface by the displacement of . 10 is a supply reel for the transfer film 7, 11 is a take-up reel, 12 is a single stack of recording paper 5, and 13 is a paper feed roller of an automatic paper feeding unit that separates and feeds the recording paper 5 one by one toward the drum 1. , 14 is a recording paper ejection stand which also serves as a lid of the recording paper storage box 15. 1
Reference numeral 6 denotes a paper ejection roller whose outer periphery is made of high-friction rubber material in order to remove the recording paper from the drum during paper ejection, and 17 a paper holding roller that prevents the rear end of the recording paper from shifting due to paper floating when the drum is stopped. , 18 are discharge rollers for guiding the recording paper 5 onto the discharge stage 14 in cooperation with the pressing spring plate 19. The following description will be given with reference to FIG. 2, which is a plan view. Paper ejection roller 1
6 has its shaft supported by a pair of arms 21 that are rotatably supported at one end by the discharge roller shaft 20, and is connected to the discharge roller shaft 20 via a pair of belts 22.
The counterclockwise rotation of the recording paper pressing roller 17 is transmitted, and the shaft of the recording paper pressing roller 17 is rotatably supported by the arm 21 as well. A motor 23 rotates the discharge roller 18 counterclockwise via a gear train 24. Reference numeral 25 denotes a paper discharge guide plate, which forms a paper discharge passage 26 between it and the arm 21.

The operation of the recording paper ejecting device configured as described above will be described below.

3 and 4 are operation explanatory diagrams.

In Fig. 3, paper feed roller 1 is
3 rotates, and the top recording paper 5 is fed from the stack 12 of recording paper, and when its front end enters the opening 2' of the bar 2, which is pushed up by the action of the cam 3 and the lever 4. , a control means based on entry detection (not shown) operates, and first the cam 3 rotates 180 degrees. As a result, the lever 4 is moved to the position shown in FIG. 1, the opening 2' is closed, and the front end of the recording paper is clamped, and the front end of the recording paper is moved away from the drum 1 by the outer side 2a of the bar via the paper ejection roller 16. The recording paper pressing roller 17 comes into contact with the drum 1, and then rotation of the drum 1 is commanded, and the recording paper 5 is wound around the drum 1 by this rotation. When the bar 2 reaches a predetermined position past the recording section 6a of the thermal head 6, the cam 8 rotates 180 degrees, and the thermal head 6, which is released from the lever 9, moves toward the center of the drum 1. As shown in the figure, the recording section 6a presses the film 7 and the recording paper 5 against the drum, and recording is started. FIG. 1 shows a state in which the drum 1 has made exactly one revolution after the start of winding.

When the recording is completed, the cam 8 is rotated 180 degrees by a control means (not shown) as shown in FIG. 4, 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. Rotate cam 3 180° and push bar 2 up using lever 4. By this pushing up, the outside 2 of the bar 2
a pushes up the paper ejection roller 16 via the rear end of the recording paper 5, so that the paper pressing roller 17 is moved away from the drum 1, and the recording paper 5, whose front end clamp is released, is wrapped around the drum 1. Loosen up.

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

Here, the motor 23 (FIG. 2) is commanded to rotate, and the ejection roller 18 and paper ejection roller 17 rotate counterclockwise. The recording paper 5 is advanced toward the paper ejection path 26, and the entire recording paper 5 is moved to the ejection tray 1 as shown by the arrow 27 by the ejection roller 18 and the pressing spring plate 19.
4 Drain on top.

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 rear end of the recording paper when wound on the drum covers the outside of the front end clamp bar of the recording paper. 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 presser roller is separated from the drum. This has the effect of solving problems caused by the rigidity of the 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 discharge device according to an embodiment of the present invention is applied, FIG. 2 is a plan view of the paper discharge and the vicinity of the discharge roller in FIG.
3 and 4 are diagrams for explaining the operation, FIGS. 5a and 5b are diagrams for explaining the general structure and operation of a conventional recording paper discharging device, and FIG. 6 is a schematic diagram for explaining the operation of another conventional recording paper discharging device. FIG. 2 is a configuration and operation explanatory diagram. 1... Drum, 2... Bar for clamping the front end of the recording paper, 5... Recording paper, 16... Paper ejection roller, 17
... Recording paper holding roller, 18 ... Ejection roller, 1
9...Press spring plate, 20...Discharge roller shaft, 21
...Arm, 22...Belt, 23...Motor,
26...Paper discharge passage.

Claims (1)

[Claims] 1 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, and a bar for clamping the front end of the recording paper between the outer circumference of the drum and the drum in the direction of rotation. When in a specific position, it can be opened and closed around the outer circumference of the drum.
When it is closed, clamp the front end above,
The device is configured to release the clamp when opened, and the device is configured such that the rear end of the recording paper when wound around the drum overlaps the front end of the recording paper outside the clamp portion of the bar. A drum having a defined circumference, a pair of arms that are separated and opposed to each other in the length direction of the drum, and whose ends are rotatably supported by a shaft serving as a fulcrum, and the other end of this arm. It is rotatably supported on both sides of the shaft by the
When the bar is in the closed position, the bar is supported at both ends by the arm between the recording paper pressing roller that presses the drum surface and the rotating support section and the recording paper pressing roller, and is driven by rotational input. When the paper ejection roller and the bar are in the open position, the outside of the clamp portion of the bar pushes up the paper ejection roller, and this pushing up causes the recording paper pressing roller to be removed from the drum. At the same time as separating the
A recording paper ejecting device comprising means for sandwiching a trailing edge of the recording paper between the outside of the clamp portion and the paper ejecting roller, and rotating the paper ejecting roller to advance the trailing edge in one direction.