JPS5943375B2 - Roll paper support device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a roll paper support device, and more particularly to a roll paper support device in a facsimile machine.

Roll paper supporting devices generally use roll paper as their recording paper. The roll paper is supported by a roll paper support shaft that is rotatably supported by a frame, is sent to the recording section by a feeding roller, and is cut by a cutter every time recording is completed. When replenishing or exchanging roll paper, the roll paper loaded first engages the feeding roller at its tip, so when replenishing or exchanging roll paper, the roll loaded first engages with the feeding roller. The paper must be rewound, disengaged from the feed roller, and then the roll of paper must be removed. SUMMARY OF THE INVENTION An object of the present invention is to provide a roll paper support device that is improved so as to be able to quickly and easily rewind the previously filled roll paper when replenishing or replacing the roll paper as described above. According to the present invention, this purpose is to provide a roll paper support shaft rotatably supported by a frame, a first gear provided on the roll paper support shaft, and a first gear provided on the roll paper support shaft and the first gear. and a one-way clutch that transmits only the rotational force in the roll paper rewinding direction from the first gear to the roll paper support shaft; a second gear that does not mesh with the first gear and meshes with the first gear when rotated by a predetermined angle or more in the roll paper rewinding direction from the non-rewinding position; This is achieved by a paper roll support device which includes a manual handle for rotating said second gear and biasing means for returning said second gear to a non-rewinding position.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 1 is a longitudinal cross-sectional view showing one embodiment of a roll paper support device according to the present invention, and FIG. 2 is a cross-sectional view taken along the line ---■ in FIG.

The roll paper support device has two plate-shaped frames 1 and 2 provided at a predetermined distance from each other. The support shaft 5 is rotatably supported via bearing members T and 8 attached to both ends thereof. The roll paper support shaft 5 supports the paper tube portion 1 of the roll paper 9 at a portion located between the frames 1 and 2.
It has a large-diameter shaft portion 11 that fits into and supports 0. As shown clearly in FIG. 2, the roll paper 9 reaches the feed roller 12, passes between the recording electrode 13 and the back roller 14, reaches the cutter 15, and is further developed. - The image is sent to the fixing device 16.

The bearing members 7 and 8 integrally have handling knobs 17 and 18 for attaching and detaching the roll paper support shaft 5.

The roll paper support shaft 5 carries a gear 19, and a one-way clutch 2 is connected between the gear 19 and the roll paper support shaft 5.
0 is set.

The one-way clutch 20 is configured to transmit only the rotational force in the unwinding direction of the roll paper, that is, the rotational force in the clockwise direction as viewed in FIG. 2, from the gear 19 to the roll paper support shaft 5. Further, the frame 1 rotatably supports a gear 22 via a shaft 21. The gear 22 has a notch 23 as a toothless part on a part of its outer periphery, and when the gear is in the initial position as the roll paper non-rewinding position as shown in FIG. When the notch portion 23 is located at the meshing position with the gear 19, it does not mesh with the gear, and when the notch portion 23 is rotated by a predetermined angle or more from the initial position, the notch portion 23 comes out of the meshing position with the gear 19. It is designed to mesh with the gear. The gear 22 also meshes with a gear 25 attached to a shaft 24 rotatably supported on the frame 1. The gear 25 is rotatable between a stop lever 26 attached to the shaft 24 and an initial stop pin 27 and a turn stop pin 28 attached to the frame 1, and has a torsion coil as a biasing means. The spring 29 applies a spring force in the counterclockwise direction as viewed in FIG. 2, and initially the stop lever 26 is in a rotational position where it abuts the initial stop pin 27, as shown in FIG. be. Further, a manual handle 30 is attached to the shaft 24. When the manual handle 30 is rotated clockwise in FIG. 2 by the operator against the action of the torsion coil spring 29, the gears 25 and 22 are rotated in the directions indicated by the arrows.

Due to the rotation of the gear 22, the notch 23 is disengaged from the meshing position with the gear 19, and by meshing with the gear 19, the gear 19 is driven to rotate clockwise as viewed in FIG. This rotational force is transmitted to the roll paper support shaft 5 via the one-way clutch 20, thereby causing the roll paper 9 supported on the shaft to
is rotated clockwise as viewed in FIG. 2, that is, in the roll paper rewinding direction, and the roll paper 9 is rewound. As a result, the roll paper that had been engaged with the feed roller 12 is now released. At this time, the stop lever 26 comes into contact with the turn stop pin 28, and the manual handle 30 can no longer be rotated clockwise as viewed in FIG. 2. As described above, when the manual handle 30 is released after the stop lever 26 comes into contact with the turn stop lever 28, the manual handle 30, shaft 24, and gear 25 are rotated by the torsion coil spring 2.
9, the stop lever 26 is rotated counterclockwise as viewed in FIG. 2 until it comes into contact with the initial stop pin 27. Due to this rotation, the gear 22 returns to its initial position in which the notch 23 is located in the meshing position with the gear 19, and is disengaged from the meshing with the gear 19 again. During the return rotation of the gear 22, the gear 19 is rotated counterclockwise as seen in FIG. The temperature is not transmitted to the roll paper support shaft 5. In addition, when the manual handle 30 is released and the stop lever 26 is in a free state in contact with the initial stop pin 27, the gear 22 is disengaged from the gear 19, so the roll paper support shaft 5 is It can rotate freely without being subjected to the load of the return mechanism. Although the present invention has been described in detail with respect to specific embodiments above, it is understood that the present invention is not limited thereto and that various embodiments are possible within the scope of the present invention. This will be obvious to businesses.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a roll paper support device according to the present invention, and FIG. 2 is a sectional view taken along the line of FIG. 1, 2... Frame, 3, 4... V groove, 5... Roll paper support shaft, 7, 8...
Bearing member, 9... Roll paper, 10...
Paper tube section, 11... Large diameter shaft section, 12...
Feeding roller, 13... Recording electrode, 14...
...Back roller, 15...Katsuta one, 16...
...recording/fixing device, 17, 18...
Ndringnov, 19...Gear, 20...
...One-way clutch, 21...Shaft, 22...
... Gear, 23 ... Notch, 24 ...
...shaft, 25...gear, 26...stop lever lever 2T...initial stop pin,
28・ ・ ・ ・ Turn stop tsupa pin, 29・
...Torsion coil spring, 30...Manual,
Ndol.

Claims (1)

[Claims] 1. A roll paper support shaft rotatably supported by a frame, a first gear provided on the roll paper support shaft, and a roll paper unwinding device provided between the roll paper support shaft and the first gear. a one-way clutch that transmits only the rotational force in the direction from the first gear to the roll paper support shaft; a second gear that does not mesh and meshes with the first gear when rotated by a predetermined angle or more in the roll paper rewinding direction from a non-rewinding position; a manual handle for rotating the second gear; A roll paper support device comprising: urging means for returning the second gear to a non-rewinding position.