JPS612626A - Paper size detecting device - Google Patents

Abstract

PURPOSE:To simplify the change-over operation upon changing of paper sizes with the use of a paper size detecting device which is energized when a paper feeder is set on a copying machine, by slidably holding magnets arranged to be opposed to magnetic sensing elements, such that the position of each magnet may be displaced back and forth, and left and right. CONSTITUTION:A paper size detecting device is arranged such that a plurality of magnetic sensing elements 15, 15a, 15b are attached to the body of a copying machine, and a plurality of magnets 18, 18a, 18b are attached to side walls of a paper feeder removably attached to the body, at positions which oppose the magnetic sensing elements. There are provided a means for sliding and securing these magnets 18, 18a, 18b to positions other than the positions which affects the magnetic sensing elements 15, 15a, 15b, and a means for urging the magnets 18, 18a, 18b toward the magnetic sensing elements 15, 15a, 15b so that the positions of the magnets may be changed in accordance with the size of papers.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a paper size detection device when a copying machine is equipped with a paper feeder for supplying copy paper.

Conventional Structure and Problems Traditionally, paper size detection devices for copying machines have been equipped with multiple reed switches in the main body of the device. It depends on attaching one magnet that corresponds to the
When the paper feeder is attached to a copying machine, a method is adopted in which the copying machine detects which size of paper the paper feeder is attached to. This method can be expected to operate easily and reliably, but in recent years, a type of paper feeder that can be changed to a plurality of paper sizes using a single paper feeder has come into widespread use. Therefore, if you change the paper size stored in the paper feeder,
It was necessary to remove and attach the magnet mentioned above. For this reason, screw tightening work is required.
For general users, this work is troublesome and there are inconveniences such as losing the magnet. Furthermore, in the case of a large-capacity paper feeder, the paper feeder itself is heavy and difficult to remove. In this way, with the above methods,
This method has the drawback of poor workability and a lot of wasted time when changing the paper size.

OBJECTS OF THE INVENTION The present invention eliminates the drawbacks of the above-mentioned conventional examples and provides a paper size detection device that has a simple configuration and is freely variable according to the paper size of copy paper stored in a paper feeder.

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention includes an apparatus main body and a paper feeder that is removably attached to the apparatus main body, a plurality of magnetic sensing elements are arranged in the apparatus main body, and a plurality of magnetic sensing elements are arranged in the apparatus main body, and A plurality of magnets are provided on a side wall at a position corresponding to the magnetic sensing element, a means for sliding and fixing the plurality of magnets out of the operating position of the magnetic sensing element, and an urging means for urging the plurality of magnets toward the magnetic sensing element. Depending on the paper size of the copy paper stored in
This allows you to change the .

DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the drawings. 1st
The figure is a cross-sectional side view of essential parts according to an embodiment of the present invention. In the figure, 1 is the main body of a copying machine, and the amount of paper fed is a paper feed opening 3 with a member 2, and a paper feed side of the paper feed opening. A paper feed roller 4 is disposed at the tip to constitute a paper feed section. 6 is a leg of the copying machine 1. 6 is a paper feeder, and a paper guide section 7 is integrally formed therein.

Separation rollers 8 are arranged so as to rotate in pressure contact with the two most sets of copy sheets 1o carried on a loading table 9 which is raised and lowered by a lifting means (not shown). Reference numerals 11a and 11b serve as guides for feeding one sheet of copy paper separated by the upper and lower paper guide plates to the paper feed roller 4. can be attached to and detached from the paper feed amount [ ] 3 of the apparatus main body 1 in the front and back directions of the paper feed direction.

A first support member 13 and a second support member 14 are disposed near the paper feed side tip of the paper feed guide section 7 with respect to the side wall 12 of the tip. This first and second support member 13.14
may be constructed integrally or separately. A plurality of magnets are held in variable positions by the side wall 12 and the first and second supports 13 and 14, and the paper size is detected in accordance with the magnetic detection element 16 provided on the side of the main body 1 of the apparatus. It has become so.

FIG. 2 is a partially sectional plan view of the paper size detection device, and FIG. 3 is a side view of the person-staff section. The configuration and operation will be explained below using these drawings.

16. 16a and 16b are hollow guide cylinders with ribs 17 formed on the top and bottom of one end as shown in FIG.
and the first support part 13. Elongated holes are formed in the side wall 12 and the first support member 13 in a direction transverse to the paper feeding direction, and the guide cylinder is held by ribs 17 so as to be slidable in the transverse direction. Inside the hollow of this guide cylinder, there is a magnet 18 at the tip, 1 sa
, I Bb holders 19, 19a, 19 provided with
b is movably arranged. The rear end of this boulder:
Bins 2o, 20a, and 20b are formed in the second support control 4, and each of the bottles is inserted and held in a horizontal elongated hole similar to that described above.

Therefore, 1 and 2 operate by following the sliding movement of the guide cylinder.
1.21&, 21b is an elastic member such as a spring that is disposed around the outer circumference of the bottle and biases the boulder in the paper feeding direction;
2.22a and 22b are engaging protrusions that are configured to be fitted and locked into notches 23.2sa and 23b formed in the respective guide cylinders. Then, there is a litho which operates by detecting magnetism in the device main body 1 located close to and corresponding to the magnets 18° 18a, 18b provided at the tips of the porters 19° 19a, 19b which are slidably held by these guide cylinders. Magnetic sensing elements such as inches 15, 16! L, 16
kl is installed. Note that 24 is a spacer provided between the side wall 12 and the first support member 13.

Next, an example of the arrangement operation according to the paper size of the copy paper stored in the paper feeder 6 will be explained.

As shown in FIG. 2, when the engaging protrusion 22 of the holder 19 equipped with the magnet 18 is fitted into the notch 23 of the guide cylinder 16, the holder 19 protrudes from the side wall 12 in the paper feeding direction due to the biasing force of the spring 21. , located within the magnetic action range of the reed switch 16. At this time, if the engagement and locking positions of the engagement protrusion and the notch are set and configured in advance, the position can be set without contacting the reed switch. If one end of the hole is formed so that the magnet is located at the center of the reed switch, it will function as a positioning stopper and facilitate positioning.

The holder 191L in the center of the figure has the retaining protrusion 22 cut out by pressing the magnet 18a or pulling the pin 20a.
31L, and turn the holder 1911 in the direction of the arrow so that its engagement protrusion 22m comes into contact with the outer surface of the guide cylinder 16&. In this way, this state is maintained by the spring 211L. Therefore, the magnet 18a is positioned outside the magnetic action range of the reed switch 15a. Further, like a reed switch, the guide cylinder 16a is slid in a direction transverse to the paper feeding direction to fix the guide cylinder 16a in a fixed position. Note that the holder 19 described above regarding the holder 19b at the bottom in the figure
Since it has the same configuration as , the explanation will be omitted. In this way, it is possible to change the magnetic action position of multiple reed switches and the magnets corresponding to the reed switches, so
It is only necessary to change the arrangement according to the paper size to be accommodated, and it can be easily changed to match the paper size without replacing the magnet as in the conventional case.

Needless to say, the above configuration can also be applied to a normal paper feed cassette.

Advantages of the Invention As detailed above, according to the present invention, the position of the magnet corresponding to the magnetic sensing element is configured to be slidable in the front, back, right, and left directions, so that the switching operation when changing the paper size can be easily performed. is obtained. In other words, there is no need to use any tools such as tightening screws, and even a general user, not a professional service person, can easily perform the switching operation, and there is no risk of losing the switch. Furthermore, it has excellent effects such as not only excellent operability but also high reliability due to its simple structure and low manufacturing cost.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of essential parts when a paper feeder equipped with a paper size detection device according to an embodiment of the present invention is attached to the main body of the device, and FIG. 2 is a partially sectional plan view of the same paper size detection device. Third
The figure is a cross-sectional side view taken along line A of the person. 1...Copying machine, 3...Paper feed opening, 6...Paper feeder, 7...Paper feed guide section, 12...Side wall, 13.
...First support member, 14...Second support member, 15°15&, 15b---Magnetic sensing element, 1
6.16J16b... Guide member, 17...
・Rib, 18°182L, 18b=-' magnet, 19
, 19u, 19b... Holder, 20.2
0 & , 20b... Bin, 21 , 21 & ,
21 b-=...-elastic member, 22, 22L. ,-,, 22b...Engaging protrusion, 23, 23a
, 23b=...notch. Figure 2/2241.3 Figure 3

Claims (2)

[Claims] (1) A device main body and a paper feeder that is detachable from the device main body, and a plurality of magnetic sensing elements are arranged in the device main body, and a plurality of magnetic detection elements are arranged on a side wall of the paper feeder at positions corresponding to the magnetic detection elements. magnets, and means for sliding and fixing the plurality of magnets out of the operating position of the magnetic sensing element and urging means for urging the plurality of magnets toward the magnetic sensing element according to the paper size of the copy paper accommodated. A paper size detection device characterized by being configured so that its position can be changed. (2) The paper feeder has first and second paper feeders arranged near its side wall.
a support member, a guide member having a rib that is inserted between the side wall of the paper feeder and the first support member and slides thereon, and a guide member having a magnet at its tip and whose rear end is supported by the second support member. Claim 1, further comprising: a holder slidably provided within the guide member; and an elastic member biasing the holder toward a magnetic sensing element provided in the device main body. Paper size detection device described in Section 1.