JPH075080Y2 - Sheet detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a sheet detection device for detecting a sheet material in, for example, a facsimile or a printer.

<Prior Art> Facsimile devices and the like widely used today convey a roll-shaped recording sheet to a recording portion to perform predetermined recording, and detect this when the recording sheet is near the end. It is a general practice to give a warning about the replacement of the recording sheet.

To detect the end of the recording sheet, a belt-shaped end mark is printed near the end of the sheet, and a sensor attached at the end mark passing position displays a predetermined message when the end mark is detected.

However, since the end mark is printed near the width direction side end of the recording sheet, when using recording sheets of different sizes, for example, when using B4 size and A4 size recording sheets, Sensors are installed at the B4 size position and A4 size position respectively, or sensor mounting holes are provided at the B4 size position and A4 size position of the device main body, and the two sensors are mounted according to the size of the recording sheet used. The sensor was fitted in any of the holes and attached.

<Problems to be solved by the invention> However, although the number of sensors used for recording is one in the above configuration, it is not efficient because two sensors are attached, and the number of parts is low in terms of cost. It is possible that the higher the price, the higher the price.

Further, the above configuration is efficient in that only one sensor is used, but any one of the two sensor mounting holes is left open, so that there is a possibility that foreign matter may enter from there. There is.

The present invention solves the above-mentioned conventional problems, and provides a sheet detection device capable of detecting sheet materials of a plurality of sizes with a single sensor and preventing foreign matter from entering through the sensor mounting hole. To do.

<Means for Solving the Problems> Means according to the following embodiments for solving the above-mentioned conventional problems include mounting holes for a plurality of sheet detection sensors which are perforated at a predetermined interval in the apparatus main body, and A sheet detection sensor and a hole filling member that can be fitted into any of the plurality of mounting holes have a sensor unit that is provided corresponding to the plurality of mounting holes and that is mounted on the apparatus body,
In the sensor unit, when the sheet detection sensor and the hole filling member are fitted into the plurality of mounting holes, even if the fitting positions of the sheet detection sensor and the hole filling member are changed, the sheet detection sensor and the hole filling member are changed. Is formed so that it can be fitted into the plurality of mounting holes.

<Operation> According to the above means, when the sensor unit is mounted in the mounting hole, the position of the sensor member can be changed by changing the orientation by 180 degrees, and at that time, the sensor mounting hole in the portion without the sensor member is Since it is filled with a hole filling member or the like, it is possible to prevent foreign matter or the like from entering through the sensor mounting hole.

<Example> Next, an example to which the above means is applied will be described with reference to the drawings.

[First embodiment]

As a first embodiment, an embodiment in which the above means is applied to a sheet detecting device for detecting an end mark of a recording sheet in a facsimile machine will be described.

FIG. 1 is a configuration explanatory view of an apparatus main body and a sensor unit, and FIG. 2 is a sectional explanatory diagram showing a mounting configuration of the sensor unit.

In FIG. 1, reference numeral A denotes a facsimile machine main body, which will be described later, and two sensor mounting holes 1a and 1b are formed at predetermined positions at predetermined intervals. The two sensor mounting holes 1a and 1b are formed in the same shape.

Further, B is a sensor unit attached to the apparatus main body A, and a sensor member 3 made of a reflection type sensor and a hole filling member 4 on the electrical board 2 are the sensor attachment holes.
It is attached at the same interval as that of 1a and 1b.
Further, both the sensor member 3 and the hole filling member 4 are formed in a shape that can be fitted into the sensor mounting holes 1a and 1b.

The holes 5 formed in the sensor unit B are screw holes when the unit B is attached to the apparatus main body A.

When the sensor unit B having the above structure is attached to the apparatus body A, as shown in FIG. 2 (A), the sensor member 3 out of the two attachment holes 1a and 1b of the apparatus body A is attached.
Is fitted into one of the sensor mounting holes 1a, and the hole filling member 4 is fitted into the other sensor mounting hole 1b.
The sensor unit B is attached to the apparatus main body A by.

Further, when changing the position of the sensor member 3, the screw 6 is removed and the direction of the sensor unit B is changed by 180 degrees as shown in FIG. 2 (B) to fit the sensor member 3 into the sensor mounting hole 1b. The hole filling member 4 is fitted into the other sensor mounting hole 1a and fixed with a screw.

As described above, the position of the sensor member 3 can be changed by changing the direction of the sensor unit B by 180 degrees. Further, when the sensor unit B is attached to the main assembly A of the apparatus, the hole filling member 4 is fitted into the hole of the two sensor mounting holes in which the sensor member 3 is not fitted, and the hole is closed to prevent foreign matter. It is possible to prevent the mixture of such as.

Next, an example in which the sensor mounting mechanism is applied to a sensor for detecting an end mark on a recording sheet of a facsimile machine will be described with reference to FIG.

FIG. 3 is a schematic sectional view of the facsimile machine A.
Briefly describing the overall configuration, R is an original reading system, and a plurality of originals 8 stacked on the original table 7 also serving as a device cover with the original surface facing down have guide members 9 at both ends. Guided by, the pre-conveyance roller 10 and separation roller
11 separate sheets are conveyed one by one from the bottom.
12a, 12b and a pair of discharge rollers 13a, 13b while being transported at a constant speed, is illuminated by a light source 14, and the reflected light reaches a photoelectric conversion element 17 such as a CCD via a mirror 15 and a lens 16 to be converted into an electric signal. Then, this signal is transmitted to a predetermined recording system.

When the recording signal is input to the recording system W, the platen roller
18 rotates in the direction of arrow a and roll-shaped thermal recording sheet 19
While the sheet is being conveyed, the recording head 20 generates heat according to the image signal, and a predetermined image is recorded on the recording sheet 19. The recording sheet 19 after recording is cut from the trailing edge of the image by the cutter 21 and stored in the reversing tray 22. Reference numeral 23 in the drawing denotes an opening for taking out the recording sheet 19 after recording.

In the facsimile machine having the above-mentioned structure, the roll holder 24 for storing the roll-shaped recording sheet 19 can selectively store the B4 size recording sheet 19 and the A4 size recording sheet 19 by centering. The recording sheet used for the above device
Both sides of the back of 19 are near the end (about 60 cm from the end)
The end mark is printed on the sheet with a color different from the background color of the sheet.

Further, between the roll holder 24 and the platen roller 18 of the apparatus main body A, the sensor mounting holes 1a and 1b having the above-described configuration (see FIG. 1) are bored, and the sensor units described above are mounted in the mounting holes 1a and 1b. B is attached.

The position of the one sensor mounting hole 1a is formed at a position where the end mark passes when the A4 size recording sheet 19 is used, and the position of the other sensor mounting hole 1b is the B4 size. When a recording sheet is used, it is formed at a position where the end mark passes.

Therefore, when using the A4 size recording sheet 19,
As shown in FIG. 2 (A), the sensor member 3 composed of a reflection type sensor is attached so as to fit into the sensor attachment hole 1a. When the recording sheet 19 of B4 size is used, as shown in FIG.
So that it fits into the sensor mounting hole 1b.

By attaching the sensor unit B to the apparatus main body A as described above, the end mark can be detected when recording sheets of different sizes are selectively used by one sensor.

Further, although sensor mounting holes are formed at positions corresponding to the respective sizes of the recording sheet, since the hole filling member 4 is fitted into the mounting holes into which the sensor member 3 is not fitted to close the mounting holes, No foreign matter is mixed in through the holes.

[Second embodiment]

Next, as a second embodiment, an embodiment in which a sensor unit is attached to one sensor attachment hole will be described.

As shown in FIG. 4, a sensor mounting hole 1c, which is a symmetrical long hole, is formed in the main body A of the apparatus, and a sensor unit B is formed.
The sensor member 3 and the hole filling member 4 are integrally formed and symmetrically formed so that the shape thereof can be fitted into the sensor mounting hole 1c. Further, the sensor member 3 is arranged at a position deviated from the center of the sensor unit B.

When attaching the sensor unit B to the apparatus body A, the sensor unit B is attached to the sensor mounting hole.
Attach by fitting in 1c.

Even with the above structure, the position of the sensor member 3 can be changed by changing the direction of the sensor unit B when fitting the sensor unit B into the sensor mounting hole 1c.

Therefore, in the example of the first embodiment described above, when the sensor unit B is attached to the apparatus main body A, the sensor member 3 is located on the left side of the center of the sensor attachment hole 1c as shown in FIG. 5 (A). When it is fitted so that it becomes a position where the end mark of the A4 size recording sheet can be detected,
As shown in FIG. 5 (B), change the orientation of the sensor unit B.
When the sensor member 3 is fitted 180 degrees apart so that it is on the right side of the center of the sensor mounting hole 1c, the sensor mounting hole is located so that the end mark of the B4 size recording sheet can be detected. By configuring the shapes of 1c and the sensor unit B, the same effect as that of the first embodiment can be obtained.

[Other Examples]

In the above-described first embodiment, the positions of the sensor mounting holes 1a and 1b are provided at positions where the A4 size and B4 size end marks can be detected, but the positions of the sensor mounting holes 1a and 1b are not limited to the size. It is natural.

Further, although the example in which one sensor unit B is attached is shown in the first embodiment, a plurality of the sensor units B may be provided.

Also, when the sensor unit B is attached to the apparatus body A, the sensor unit B may be attached to the apparatus body A, for example, without being limited to the case where the sensor unit B is attached with a screw as in the first embodiment. Further, if the hole filling member 4 is configured to be fit in the sensor mounting hole,
The hole filling member 4 also serves as a mounting holder for the sensor unit B, and the hole filling member B can be easily mounted by simply fitting the hole filling member B into the sensor mounting hole.

Further, in the first embodiment, the example in which the sensor unit B detects the end mark of the recording sheet has been shown, but the attachment mechanism does not need to be limited to only the recording device. It may be provided on the conveyance path to detect the size of the document or the like.

<Effect of the Invention> As described above, according to the present invention, when the sensor unit is attached to the main body of the apparatus, the sensor unit can be attached by changing the direction of the unit. Therefore, one sensor member can detect a plurality of locations, Moreover, when the sensor unit is attached, the hole filling member prevents unnecessary holes from remaining in the apparatus main body, so that it is possible to prevent foreign matter and the like from entering through the sensor attachment hole.

Further, since the sensor member and the hole filling member are configured as a sensor unit, it is not necessary to prepare a separate component for the hole filling, the cost of the component can be reduced, and the manufacturing process can be simplified.

[Brief description of drawings]

FIG. 1 is a configuration explanatory view of a sensor unit and a sensor mounting hole, FIGS. 2 (A) and 2 (B) are state explanatory diagrams when the sensor unit is mounted on the apparatus main body, and FIG. 3 is the sensor mounting mechanism. Illustration of the application of the
4 and 5 are explanatory views of other embodiments. A is a recording apparatus main body, B is a sensor unit, 1a, 1b and 1c are sensor mounting holes, 2 is an electrical equipment substrate, 3 is a sensor member,
4 is a hole filling member, 5 is a screw hole, 6 is a screw, 7 is a document mounting table, 8 is a document, 9 is a guide member, 10 is a pre-conveying roller,
11 is a separation roller, 12a and 12b are conveying rollers, 13a and 13b are discharge rollers, 14 is a light source, 15 is a mirror, 16 is a lens, 17 is a photoelectric conversion element, 18 is a platen roller, 19 is a recording sheet, and 20 is a recording sheet. Head, 21 is cutter, 22 is tray, 23 is open, 24
Is a roll holder.

Claims (3)

[Scope of utility model registration request] 1. A mounting hole for a plurality of sheet detection sensors, which is perforated at a predetermined interval in an apparatus body, and a sheet detection sensor and a hole filling member which can be fitted into any of the plurality of mounting holes. And a sensor unit provided to correspond to the plurality of mounting holes for mounting to the apparatus main body, wherein the sensor unit is used when the sheet detection sensor and the hole filling member are fitted into the plurality of mounting holes. A sheet detection device, wherein the sheet detection sensor and the hole filling member are formed so that they can be fitted into the plurality of mounting holes even if the fitting positions of the sheet detection sensor and the hole filling member are changed. 2. The sheet detection device according to claim 1, wherein the mounting holes of the plurality of sheet detection sensors are symmetrical holes formed at predetermined positions of the apparatus body. apparatus. 3. The sheet detecting device according to claim 1, wherein the sheet detecting sensor detects an end mark near the end of the sheet.