JPS622186Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrostatic recording device having a developing device used in, for example, a facsimile machine, and particularly relates to an improvement in the recording paper moving means of the paper feeding mechanism.

There are several configurations of electrostatic recording devices depending on the arrangement of rollers, etc., but in the pre-cut method,
The main configuration is approximately as shown in FIG. Referring to FIG. 1, the structure and operation of the pre-cut type electrostatic recording apparatus shown here will be briefly explained.

The leading end of the recording paper 1 wound into a roll is guided in a predetermined direction by a guide roller 2, and inserted between a capstan 3 and a pinch roller 4 that presses against the capstan 3. The rotation of the capstan 3 is transmitted from a rotary drive motor 5 via a belt and a pulley. Similarly, the rotation is transmitted from the rotary drive motor 5 to rotate the pulley 9, and the back pressing roller 7 is rotated together via the pulley 9 and the support shaft 8. The recording paper 1 that has passed between the capstan 3 and the pinch roller 4 is inserted between the back pressure roller 7 and the electrostatic recording head 11 that is in contact with it, and then cut into a predetermined size by a cutter 12. Katsuta 12
The cut recording paper 1 is inserted between another capstan 14 rotated by the rotary drive motor 5 and another pinch roller 13 in pressure contact with the capstan 14,
As a result, the cut recording paper 1 passes over the developing device 15.

Toner 10 containing a magnetic material is stored in the developing device 15, and is developed here. The developed recording paper 1 is conveyed to the recording paper conveyance belt 16 stretched over rollers 18, 19, 20, and 21 while being adsorbed by the vacuum, passes through the fixing device 17, is fixed, and is fixed in the direction indicated by the arrow. Paper is ejected in direction 6.

It is well known that the above-mentioned pre-cut method has the advantage that there is no margin at the leading edge of the recording paper and the recording paper can be used economically.

However, on the other hand, the leading edge of the recording paper has the disadvantage that it may constantly become "clogged" when passing through the back pressure roller 7, the cutter 12, the developing device 15, and the fixing device 17.
In other words, since the recording paper itself is very thin,
A "clog" may also occur due to some inconvenience. Therefore, although various designs have been made in the past in order to prevent this from occurring, they are still not perfect. Especially when passing through the developing machine 15, the recording paper introduction guide 2
Since the distance between the developing device 2 and the rotating drum 24 is extremely narrow, 0.5 to 0.8 mm, "clogging" is likely to occur in the developing device 15.

Conventionally, in order to eliminate this "clog", the transfer path on the exit side of the developing device 15 has been designed to be wide. Since the transfer path is designed to be wide on the exit side, the recording paper 1 is easily attracted to the recording paper conveyance belt 16. However, no countermeasures have been taken on the entrance side, so if the leading edge of the recording paper 1 gets jammed in the developing machine 15 for some reason, the trailing part will bend and wind up around the capstan 14 as shown in FIG. There was a risk that it would be turned around. Once the recording paper 1 is wound around the capstan 14, it is difficult to remove it, and if the paper is continuously fed as it is, there is a risk of damaging the equipment in some cases.

The present invention was developed in view of the drawbacks of the conventional methods. Even if the leading edge of the recording paper becomes jammed in the developing machine, the flexible part of the recording paper will not be wound around the capstan and will be ejected out of the paper feeding path. This system detects paper jams and stops equipment, etc., and one embodiment of the present invention will be described in detail below with reference to the drawings. Note that there is no difference from the conventional example except for the paper feed roller portion on the upstream side of the developing machine, so a description thereof will be omitted. Further, the same parts as in the conventional example are given the same reference numerals.

In FIGS. 3 and 4, a capstan 23 serves as a paper feed roller similar to other conventional capstans 14, but a circumferential groove 25 is cut on the outer periphery, and a paper feed path 26 is provided. Recording paper 1 ejected from
The free end of the guide 27 that guides the flexible portion 1a of
It is buried in the groove 25. Reference numeral 28 denotes a guide roller that comes into contact with the upper left part of the capstan 23 near where the guide 27 is buried, and rotates together with the capstan 23 to eject the flexible portion 1a of the recording paper 1. Reference numeral 29 denotes another guide provided opposite to the guide 27, which also restricts the flexible portion 1a of the recording paper 1. Reference numeral 30 denotes a swing guide rotatably attached to a shaft 32 located downstream of the capstan 23 and parallel to the capstan shaft 31, and is easily lifted by the flexible portion 1a of the recording paper 1. . 33 is provided on the downstream side of the guide roller 28 for discharging the flexible portion 1a of the recording paper 1;
A photo sensor detects the bending part 1a, and when the bending part 1a is detected, it issues a command to stop the entire facsimile machine.

If the leading edge of the recording paper 1 bends 34 and gets jammed between the introduction guide 22 of the developing device 15 and the rotating drum 24, the capstan 23 and the pinch roller 13 continue to rotate, so that the following part of the recording paper 1 is jammed. will flex and lift the free end of the swing guide 30. Then, the flexible portion 1a of the recording paper 1 is moved along the swing guide 30 to the pinch roller 13 and the capstan 2.
When it is guided to the contact portion 3 and further extended, it is held and transferred by the capstan 23 and the guide roller 28, and rises between the guides 27 and 29 disposed opposite to each other. When the bending portion 1a rises to a certain extent, it is detected by the photo sensor 33, and the facsimile device stops after a certain period of time has elapsed. Since the facsimile machine stops with the flexible portion 1a not wrapped around the capstan 23 and slightly extending from between the guides 27 and 29, the operator can
By pulling out the paper, the jammed recording paper 1 can be easily removed.

As mentioned above, according to the present invention, even if the leading edge of the recording paper becomes jammed in the developing machine, the flexible part will not wrap around the capstan, so the facsimile machine can be used for a long time until the problem is resolved. There is no need to stop the equipment and there is no risk of damaging the equipment.

Furthermore, since the facsimile device can be automatically stopped when the bending portion is formed, less recording paper is wasted.

Although the present invention relates to the paper feeding mechanism of a facsimile machine, the present invention can be implemented with any thin strip-shaped object; for example, a video tape recorder or a normal tape. It can also be implemented as a tape transport mechanism in a recorder.

[Brief explanation of the drawing]

1 and 2 are a front view and an enlarged view of the main parts showing the schematic structure of a conventional example, and FIGS. 3 and 4 are an enlarged view of the main parts and a perspective view thereof showing an embodiment of the present invention. be. DESCRIPTION OF SYMBOLS 1... Recording paper, 1a... Flexible portion, 13... Pinch roller, 23... Capstan, 26... Paper feeding path, 28... Guide roller, 30... Rocking guide, 33... Photo sensor.

Claims (1)

[Claim for Utility Model Registration] 1. Paper feeding rollers facing each other to sandwich and transport the recording paper from the front and back sides, and one paper feeding roller that contacts one of the paper feeding rollers to move the bent portion of the recording paper out of the paper feeding path. A guide roller for ejecting the paper, a swinging guide located downstream from the paper feed roller to guide the flexible part of the recording paper to the contact area between the paper feed roller and the guide roller, and a free end that is connected to the paper feed roller. a guide disposed close to a contact portion of the guide roller and guiding a flexible portion of recording paper discharged from the guide roller;
Disposed on the downstream side of the guide roller, it serves as a means for detecting the deflection of the recording paper, and when the recording paper is deflected, the deflection is ejected to the outside of the paper feeding path, and the deflection phenomenon is also detected. A paper feeding mechanism for a facsimile device characterized by the following. 2. A paper feeding mechanism for a facsimile machine according to claim 1, wherein the paper feeding roller is a capstan and a pinch roller. 3. A paper feeding mechanism for a facsimile apparatus according to claim 1 or 2, wherein the means for detecting the deflection of the recording paper is a photo sensor.