JPH0138119Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Technical Field) This invention relates to a device for detecting the end of a roll paper.

(Prior Art) In devices such as electrophotographic copying machines, diazo copying machines, and facsimiles that feed paper using roll paper, for example, the free end of a roll paper detection member is brought into contact with the circumferential surface of the roll paper, The roll paper detection member is rotated as the diameter of the paper roll decreases, and a switch for generating a roll paper end signal is activated at the rotational displacement position of the roll paper detection member when the roll paper runs out. In order to alert the operator to this, roll paper end lamps and other lights are turned on.

This type of roll paper detection member is
As exemplified in Publication No. 2107, the elasticity of a spring gives the roll paper a rotational habit in the direction of decreasing the winding diameter, and when no roll paper is loaded, the roll paper detection member It is in a state where it has advanced to the roll paper loading area. Therefore, when loading a new roll paper into the paper feed position, the roll paper presses against the free end of the roll paper detection member and pushes the member around against the elasticity of the spring. Therefore, the roll paper detection member may be deformed by the pressing force, or the surface of the roll paper may be damaged. This kind of problem can be solved by retracting the roll paper detection member from the area occupied by the roll paper loading in advance, but conventionally, such evacuation was done manually, and this type of work was extremely time consuming. It was a hassle.

(Purpose) The purpose of this invention is that when the roll paper is removed,
The roll paper detection member is automatically moved away from the roll paper loading area so that it does not get in the way of loading a new roll paper, thereby preventing deformation of the roll paper detection member, and preventing roll paper detection. It is an object of the present invention to provide a roll paper end detection device that eliminates the need for manual evacuation work of members.

(Structure) The structure of the present invention will be described below based on examples.

In FIGS. 1 and 2, a roll paper detection member 1 is rotatably supported by a support member 3 fixedly provided on a paper feed unit housing 2. As shown in FIGS. A roller 4 is installed at the rising free end of the roll paper detection member 1.
is attached, and a switch actuating member 5 is fitted and fixed to one end of the rotating base end of the roll paper detecting member 1. The reset member 6 is attached to the paper feed unit housing 2.
The reset member 6 is pivotally connected to a loading plate 7 fixed to the side by a riveted shaft 9, and a roller 11 is attached to one arm end of the reset member 6, and a roller 11 is attached to the other arm end. A stopper pin 10 is implanted.

Tight springs 12 and 13 are hung between the members 5 and 6 and the immovable pins, respectively.
Among them, the spring 13 has a stronger elasticity than the other spring 12.

Here, in FIG. 2, the paper feed unit housing 2
is adapted to be pulled out from the main body of a copying machine or facsimile machine in a direction perpendicular to the axial direction of the roll paper 16, and in this state, the roll shaft 17 of the roll paper 16 to be loaded is pulled out from both opposing sides. Insert into the U-shaped notches 18 and 19 of the loading plates 7 and 8. Note that the reference numeral 21 in FIG. 2 is an end face presser for the roll paper, and the reference numeral 22 in FIG. 1 is a winding core around which the roll paper is wound.

The roll shafts 17, 17 shown in FIG.
8, 19, the roll shaft 17 on the back side
then push down the roller 11 and release the reset member 6.
is rotated clockwise from the imaginary line position to the solid line position around the riveted shaft 9 against the elasticity of the spring 13 in FIG.

Then, the stopper pin 10, which has been restricting the counterclockwise rotation of the switch actuating member 5 due to the elasticity of the spring 12 at the imaginary line position, is displaced to the solid line position and releases the switch actuating member 5. At this time, the loaded roll paper 16 and the rollers 4 of the roll paper detection member 1 come into contact with each other. In this state, the switch actuating member 5 is
Since it is in contact with the roll paper 16, it is held following the solid line position. Note that when the diameter of the roll paper is relatively small, by releasing the switch actuating member 5 as described above, the member 5, together with the roll paper detection member 1, causes the rollers 4 to come into contact with the roll paper. Rotate counterclockwise until .

In this way, the reset member 6 resets the roll paper 16.
When the roll paper detection member 1 is not loaded at the paper feeding position shown in FIG. 1, the roll paper detection member 1 is held at the solid line position, which is retracted from the roll paper loading area. Further, the reset member 6 is configured so that when the roll paper is loaded,
By rotating and displacing in conjunction with this loading, the switch actuating member 5 is released and the roll paper detecting member 1
The above holding operation is canceled.

Here, in FIG. 1, assuming that the roll paper loading has been completed, the paper feed unit casing 2 that has been pulled out is pushed into the back of the apparatus main body, and then the leading edge of the rolled paper is placed on the paper feed roller pair 23. Put it in your mouth.

In this state, as the paper feed roller pair 23 rotates in the direction of the arrow to feed paper, the winding diameter of the roll paper gradually decreases, and accordingly, the roll paper detection member 1 detects that the switch is activated. Under the elasticity of the spring 12, the member 5 is rotationally displaced in the direction in which the winding diameter of the roll paper decreases, that is, in the counterclockwise direction.

While the roll paper detection member 1 rotates, when the roll paper wound around the winding core 22 runs out, the roll paper detection member 1 reaches the position shown by the imaginary line, and at this time, the switch actuating member 5 moves to the position shown by the imaginary line. As shown in
Micro switch 2 for generating roll paper end signal
4 to turn on the roll paper end lamp (not shown).

At the same time, the roll paper cutter 25 disposed above the apparatus rotates to cut the paper, and the paper feed roller 23 stops to complete the paper feeding operation. The operator who operates this type of device detects the illumination of the roll paper end lamp, removes the remaining cut paper pieces, and removes the winding core 22 shown in FIG. Pull it out.

Then, the reset member 6 whose roller 11 portion was pressed by the roll shaft 17 until now,
The elasticity of the spring 13 rotates counterclockwise around the rivet shaft 9, and the roller 11 rises to the imaginary line position, and the stopper pin 10 pushes and moves the switch actuating member 5 from the imaginary line position to the solid line. Rotate into position. At this time, the roll paper detection member 1
It rotates from the imaginary line position to the position shown by the solid line, that is, a position retracted from the roll paper loading occupied area, and is held at this rotated position. In this state, load the next new roll paper.

In this way, when trying to load a new roll paper, the roll paper detection member 1 is already retracted from the roll paper loading area, so it is necessary to deform the roll paper detection member or remove the roll paper. There is no risk of damaging the surface. Also,
When loading roll paper, there is no need to manually rotate the roll paper detection member 1 clockwise.

In the present invention, the roll paper used is, for example, photosensitive paper in the case of a diazo copying machine, but this type does not matter, and the roll paper may also be plain paper transfer paper for PPC copying machines. You can use paper, facsimile paper, or other materials.

(Effects) As described above, according to the present invention, the roll paper detection member is configured to retreat from the roll paper loading area before loading the roll paper, so that the roll paper detection member deforms when loading the roll paper. There is no risk that the surface of the roll paper will be damaged, and there is no need to manually move the roll paper detection member.

[Brief explanation of the drawing]

FIG. 1 is a front view of an apparatus according to an embodiment of the present invention, and FIG. 2 is a perspective view of essential parts of the apparatus according to the embodiment. 1... Roll paper detection member, 5... Switch operating member, 6... Reset member, 16... Roll paper,
24...Switch.

Claims (1)

[Claims for Utility Model Registration] The central axis 17 is connected to the notch 18 for the roll paper device,
The free end 4 is in pressure contact with the circumferential surface of the roll paper loaded by dropping the roll paper into the roll paper 19, and the free end 4 is rotated to follow the decrease in the winding diameter of the roll paper to detect the end of the roll paper. Movable roll paper detection member 1
and a switch 24 that generates a roll paper end signal when the roll paper detection member detects the end of the roll paper. a switch actuating member 5 that actuates the switch when the detecting member detects the end of the roll paper; one end 11 is located within the path of the central axis that falls into the notch, and the other end 10 is located near the switch actuating member. The switch member is disposed between the notch and the switch member, and an intermediate portion between the one end and the other end is rotatably supported by a shaft 9, so that when the center shaft falls into the notch, the one end becomes the center of the switch member. and a reset member 5 which is pushed and moved by a shaft and which pushes the switch actuating member around at the other end to rotationally displace the roll paper detection member to a position where it is retracted from the roll paper loading area. Termination detection device.