JPH06293447A - Mounting structure for paper sheet sensor - Google Patents

Abstract

PURPOSE:To simplify assembly and to reduce the number of parts. CONSTITUTION:Support parts 30 and 31 are integrally formed on the inner surface of the front of a main frame 1. The support parts 30 and 31 comprises engaging pieces 32 and 33 provided at respective tips with engaging recessed parts 32a and 33a; and screw lock parts 34 and 35. Engaging protrusion parts 38a and 39a are integrally formed to the ends on one side of base sheets 38 and 39 of sheet sensors 28 and 29 and through-holes 38b and 39b are formed on the other end side. First, engaging protrusion parts 38a and 39a at the ends on one side of the base sheets 38 and 39 are engaged with the engaging recessed parts 32a and 33a of the engaging pieces 32 and 33 of the main frame 1. Under this state, sheet sensors 28 and 29 are securely arranged to the support parts 30 and 31 of the main frame 1 in a way that a screw 46 is screwed in the screw holes 34a and 35a of screw lock parts 34 and 35 through the through-holes 38b and 39b on the other end side of the base sheets 38 and 39.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a sheet sensor for detecting a sheet transported in a sheet transport passage in a facsimile machine or the like.

[0002]

2. Description of the Related Art Generally, for example, a document transfer passage for transferring a read document is formed in a frame of a facsimile machine. The image on the original is read by the image sensor and the read image data is transmitted while the original is being transported through the original transport path.

Further, a paper sensor is arranged in the apparatus frame so as to face the document transfer passage. Then, by detecting the document conveyed in the document conveying path by the paper sensor, the operation timing of the feed roller for imparting the document to the document, the operation timing of the image sensor, the occurrence of paper jam, etc. Trying to recognize.

Conventionally, a pair of screw fastening portions are formed on the device frame, and the paper sensor is attached to the device frame by screwing both ends of the substrate of the paper sensor to the respective screw fastening portions. It was

[0005]

Therefore, in the conventional apparatus, it is necessary to screw both end portions of the substrate of the paper sensor to the respective screw-fastening portions, which increases the number of assembling steps and complicates the work of mounting the paper sensor. In addition, there is a problem that the number of parts such as screws to be used increases.

The present invention has been made in order to solve the above problems, and an object thereof is to provide a paper sensor mounting structure which can be easily assembled and can reduce the number of parts. To do.

[0007]

In order to achieve the above object, according to the present invention, a sheet sensor for detecting a sheet transported in the apparatus frame is disposed so as to face the sheet transport path. In the mounting structure of the apparatus, an engaging portion and a screwing portion are formed on the apparatus frame, and the other portion of the sensor is screwed to the screwing portion in a state where a part of the paper sensor is engaged with the engaging portion. The paper sensor is configured to be attached to the apparatus frame by being stopped.

[0008]

Therefore, according to the present invention, in order to mount the paper sensor, a part of the paper sensor is first engaged with the engaging portion of the apparatus frame, and in this state, the other portion of the paper sensor is attached to the apparatus frame. Secure with screws on the screws. Therefore, only a part of the paper sensor needs to be engaged, and the screwing is performed only at one place, so that the assembling is easy and the number of parts such as screws to be used is small.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in a facsimile machine will be described below with reference to the drawings.

As shown in FIG. 3, a main frame 1 as a device frame of a facsimile machine is made of a synthetic resin material, and a cover frame 2 made of a metal plate is attached to an upper surface of the main frame 1 by a spindle 3 so as to be openable and closable. Has been.
A top cover 4 made of a synthetic resin material is fixed on the cover frame 2 and is opened / closed and rotated integrally with the cover frame 2. On the upper surface of the top cover 4, an operation panel 5 having various operation keys and a liquid crystal display unit is formed, and an original support surface 6 for stacking and supporting the original P1 is formed. The bottom cover 7 is formed of a metal plate, and is fixed to the lower surface of the main frame 1 with screws so as to cover the lower surface opening. The metal bottom cover 7 and the cover frame 2 increase the rigidity of the entire apparatus.

An original insertion port 8 is formed in the top cover 4, and an original transfer passage 9 as a paper transfer passage is provided between the main frame 1 and the cover frame 2 so as to correspond to the original insertion port 8. Has been formed. Then, the document P1 on the document supporting surface 6 is inserted into the apparatus through the document insertion port 8 thereof, and the feeding roller 10 and the separation pad 1 are also provided.
In cooperation with 1, the sheets are separated one by one, and the document transfer passage 9
Sent inside. Further, in the middle of the document transfer passage 9, the drive rollers 12a and 13a which can be positively rotated and the drive roller 1 are provided.
Two sets of feed rollers 12 and 13 composed of driven rollers 12b and 13b that are in pressure contact with 2a and 13a are arranged, respectively. Then, the document P1 in the document transfer passage 9 is fed by the rotation of the feed rollers 12 and 13, and is discharged to the outside from the document discharge port 14 at the front end of the apparatus.

The first sheet sensor 28 is arranged on the upstream side of the feeding roller 10 so as to face the document transfer passage 9. When the document P1 on the document supporting surface 6 is inserted into the apparatus through the document insertion port 8 and the front end of the document P1 is detected by the sheet sensor 28, the feeding roller 10 and the feed rollers 12 and 13 are operated. Is rotated. As a result, the lowermost original P1 among the originals P1 on the original support surface 6 is fed into the original transfer passage 9 and
Transferred inside.

A reading window 15 is formed in the main frame 1 between the two sets of feed rollers 12 and 13 so as to face the document transfer passage 9. Then, the document P transferred through the document transfer passage 9 through the reading window 15
1 is irradiated with light from a light source 16 composed of an LED. Then, the reflected light from the original P1 passes through a plurality of mirrors 17 and lenses 18 and an image sensor 19 composed of a CCD.
Then, the image on the original P1 is read.
In addition, a mounting frame 20 is provided on the lower surface of the main frame 1.
Are fixed by screws or the like, and the light source 16, the mirror 17, the lens 18, and the image sensor 19 are mounted and supported on the mounting frame 20.

The second sheet sensor 29 is provided between the feed roller 12 on the upstream side and the reading window 15 so that the document transfer passage 9 is provided.
It is arranged so as to face. Then, the document transfer passage 9
When the front end of the first original P1 transported inside is detected by the paper sensor 29, the rotations of the feeding roller 10 and the feed rollers 12 and 13 are temporarily stopped. In this state, when a predetermined operation key such as a start key on the operation panel 5 is operated, the feeding roller 10 and the feed rollers 12 and 13 are rotated again, and the transfer of the first original P1 is restarted.
At the same time, the light source 16 and the image sensor 19 are activated, and the image sensor 19 reads the image on the original P1.

At this time, when the other original P1 is still present on the original supporting surface 6 and the original P1 is detected by the first paper sensor 28, the original P1 on the original supporting surface 6 is first detected. The document P1 is continuously fed and transferred, and the image on the document P1 is also continuously read. Then, the last document P1 on the document supporting surface 6
When the trailing edge of the original P1 is detected by the first paper sensor 28 after being fed in, the feeding roller is fed a predetermined time after the trailing edge of the original P1 is detected by the second paper sensor 29. The rotation of 10 and the feed rollers 12 and 13 is stopped. At the same time, the operations of the light source 16 and the image sensor 19 are stopped, and the original P1 by the image sensor 19 is stopped.
The reading of the above image is completed.

The first and second sheet sensors 28, 29
The configuration and its mounting structure will be described in detail later. On the other hand, a paper storage portion 21 is formed in a substantially middle portion of the main frame 1, and a roll-wound recording paper P2 is stored in the paper storage portion 21. Platen roller 22
Is rotatably supported on the main frame 1, and a thermal head 23 is provided on the lower surface of the cover frame 2 so as to face the platen roller 22 thereof.
Is supported through. Then, the recording paper P2 sent out from the paper storage unit 21 is supported on the platen roller 22 by the thermal head 23, and is fed by the rotation of the platen roller 22. Then, with the recording paper P2 supported on the platen roller 22, the thermal head 23 is based on the received image data and the like.
Thus, printing is performed on the recording paper P2.

The recording paper P2 after printing is provided between the pair of upper and lower paper guides 25, and the movable blade 26a of the cutter mechanism 26 and the fixed blade 2.
It is ejected to the outside of the apparatus through the space between 6b and 6b and placed on the recording paper tray 27. When the printing of the image data for one page is completed, the movable blade 26a of the cutter mechanism 26 is actuated, and the recording paper P2 is cut between the movable blade 26a and the fixed blade 26b.

Next, the first and second sheet sensors 2
The configurations of Nos. 8 and 29 and the mounting structure thereof will be described in detail. As shown in FIGS. 1 to 5, support portions 30 and 31 for mounting and supporting the first and second sheet sensors 28 and 29 are formed on the inner surface of the front portion of the main frame 1, respectively. 1 and 2 are partially cutaway perspective views showing the main frame 1 of the facsimile apparatus from the bottom. The respective support portions 30 and 31 include engagement pieces 32 and 33 as engagement portions,
The engaging pieces 32, 33 have screw fastening portions 34, 35 arranged laterally at predetermined intervals.

The engaging pieces 32, 33 are the main frame 1
Is integrally formed on the inner surface of the so as to project downward, and engaging recesses 32a and 33a are formed at the tips thereof. Similarly to the engaging pieces 32 and 33, the screw fastening portions 34 and 35 are integrally formed on the inner surface of the main frame 1 so as to project downward, and the screw holes 34a and 35a thereof are opened downward. Further, the engagement protrusions 36, 3 are formed on the inner surface of the main frame 1 so as to be adjacent to the screw fastening portions 34, 35.
7 is integrally formed so as to project downward. Long hole 1
a and 1b are engaging pieces 32 and 33 and screw fastening portions 34 and 35.
And is transparently provided on the main frame 1.

On the other hand, the first and second sheet sensors 2
Reference numerals 8 and 29 designate substrates 38 and 39 having a rectangular shape in plan view, supports 40 and 41 having a U-shaped cross section fixed on the substrates 38 and 39, and rotatable to the supports 40 and 41. It has supported sensor fillers 42 and 43. Photointerrupters 44, 45 are provided on the inner surfaces of the supports 40, 41.
Are attached, and the light emitting elements 44a and 45a and the light receiving element 4 are attached.
4b and 45b are arranged to face each other with the sensor fillers 42 and 43 interposed therebetween.

As shown by the solid lines in FIGS. 4 and 5, the light emitting elements 44a and 45a are always connected to the light receiving element 44.
Light reaching b and 45b is blocked by the sensor fillers 42 and 43, and the paper sensors 28 and 29 are in the off state. From this state, as shown by the chain line in FIGS. 4 and 5,
When the sensor fillers 42 and 43 are rotated and fallen down,
The light from the light emitting elements 44a and 45a is applied to the sensor filler 4
Light receiving elements 44b and 45b without being blocked by 2, 43
Detected by. As a result, the paper sensors 28, 29
Turns on.

As shown in FIGS. 1 to 5, one end of the substrate 38, 39 of each sheet sensor 28, 29 is engaged with the engaging recess 32a, 33a of the engaging piece 32, 33. The compound convex portions 38a and 39a are integrally formed. Then, the engaging protrusions 38a and 39a are respectively replaced with the engaging recesses 32a and 33.
By engaging with a, the ends of the substrates 38, 39 of the paper sensors 28, 29 are positioned with respect to the engaging pieces 32, 33 of the main frame 1.

Further, the substrate 38 of each paper sensor 28, 29,
On the other end side of 39, through holes 38b and 39b are formed so as to correspond to the screw holes 34a and 35a of the screw fastening portions 34 and 35, respectively, and engageable with the engaging protrusions 36 and 37. The joint holes 38c and 39c are transparently provided. And
Engagement holes 38c, 39c of the substrates 38, 39 with the engagement protrusions 38a, 39a engaged with the engagement pieces 32, 33.
Are engaged with the engagement protrusions 36 and 37, the paper sensors 28 and 29 are moved to the support portions 30 and 30 of the main frame 1, respectively.
Positioned with respect to 31. In this state, the substrate 3
The through holes 38b and 39b of 8 and 39 correspond to the screw holes 34a and 35a of the screw fastening portions 34 and 35 of the main frame 1, respectively. Then, in this state, the through holes 38b, 3
As shown in FIG. 2, the paper sensors 28 and 29 are connected to the support portions 30 of the main frame 1 by screwing the screws 46 into the screw holes 34a and 35a through 9b and tightening them.
It is fixedly arranged at 31.

Then, the paper sensors 28, 2 as described above are used.
In the attached state of 9, the tip ends of the sensor fillers 42 and 43 are positioned in the sheet transfer passage 9 through the elongated holes 1a and 1b of the main frame 1. Then, the above-mentioned document P
That the front end of 1 is detected by the first and second paper sensors 28 and 29 means that the sensor fillers 42 and 43 are laid down by the original P1 and the paper sensor is detected as shown by the chain line in FIGS. 4 and 5. This is when 28 and 29 are turned on. Similarly, the rear end of the original P1 is the paper sensor 2 as described above.
8 and 29 means that the original P1 is passed over the sensor fillers 42 and 43, and the fillers 42 and 43 are returned and rotated from the laid state as shown by the solid lines in FIGS. 4 and 5. And the paper sensors 28 and 29 are turned off.

Now, in the facsimile apparatus constructed as described above, the first and second paper sensors 28 and 29 are used.
In order to attach the paper, first, the paper sensors 28, 29
Engaging projections 38a formed on one ends of the substrates 38, 39 of
39a is engaged with the engagement recesses 32a, 33a of the engagement pieces 32, 33 of the respective support portions 30, 31 of the main frame 1. Next, in this state, the engagement holes 38c and 39c formed on the other end side of the substrates 38 and 39 of the paper sensors 28 and 29, respectively.
Are engaged with the engagement protrusions 36 and 37 of the main frame 1. As a result, the sheet sensors 28 and 29 are positioned with respect to the support portions 30 and 31 of the main frame 1.

Then, in this state, the through holes 38b, 39b of the substrates 38, 39 correspond to the screw holes 34a, 35a of the screw fastening portions 34, 35 of the main frame 1, respectively. Then, in this state, the screws 46 are screwed into the screw holes 34a, 35a through the through holes 38b, 39b and tightened, so that the first and second paper sensors 28, 29 are removed as shown in FIG. Each support part 3 of the main frame 1
It is fixedly arranged at 0 and 31. And this paper sensor 2
In the mounting state of No. 8 and 29, the sensor fillers 42 and 4
The leading end of the sheet 3 is positioned in the sheet transfer passage 9 through the long holes 1a and 1b of the main frame 1.

As described above, in this embodiment, first, one ends of the substrates 38 and 39 of the paper sensors 28 and 29 are engaged with the engagement pieces 32 and 33 of the main frame 1. In this state,
The other ends of the substrates 38, 39 of the paper sensors 28, 29 are engaged with the engaging protrusions 36, 37 of the main frame 1 to be positioned, and the screw fixing portions 34 of the main frame 1,
The first and second sheet sensors 28 and 29 can be fixedly arranged on the respective support portions 30 and 31 of the main frame 1 by simply screwing them to 35. That is, the paper sensor 28,
One end of the base plates 38 and 39 of 29 need only be engaged, and screwing can be performed only on the other end side of the base plates 38 and 39. Therefore, unlike the conventional case, the paper sensor 28,
Since it is not necessary to screw both ends of the 29 substrates 38 and 39, respectively, the assembling is simple and the number of parts such as the screws 46 to be used can be reduced.

Further, in this embodiment, the paper sensors 28 and 29 are provided on the main frame 1 which constitutes the basic frame of the apparatus.
Support portions 30 and 31 for mounting and supporting the are integrally formed. That is, in this embodiment, the mainframe 1
Not only constitutes the appearance of the apparatus but also constitutes a part of the document transfer passage 9 and also serves as a support frame for mounting and supporting various devices. Therefore, it is not necessary to newly provide a support frame for mounting and supporting the paper sensors 28 and 29 separately from the frame forming the external appearance of the apparatus, and the apparatus configuration can be simplified and the manufacturing cost can be reduced. can do.

The present invention is not limited to the above-described embodiments, and the configurations of the respective parts can be modified and embodied as follows without departing from the gist of the present invention. (1) Appropriately change the shapes of the support portions 30, 31 and the like. (2) Do not provide the engaging protrusions 36 and 37 of the supporting portions 30 and 31. Even if the engagement protrusions 36 and 37 are not provided, the ease of assembling the paper sensors 28 and 29 is not significantly affected. (3) The present invention may be embodied not only in a facsimile machine but also in a mounting structure of a paper sensor arranged in a recording paper transfer passage of a printer, for example.

[0030]

As described above in detail, according to the present invention, it is possible to easily perform the assembling, and it is possible to reduce the number of parts, which is an excellent effect.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing from a bottom surface a state before a paper sensor is attached to a main frame, showing an embodiment in which a paper sensor attachment structure of the present invention is embodied in a facsimile apparatus.

FIG. 2 is a partially cutaway perspective view showing a state in which the paper sensor is attached to a main frame from a bottom surface.

FIG. 3 is a cross-sectional view of a facsimile device.

FIG. 4 is an enlarged cross-sectional view of an essential part of a paper sensor.

5 is a cross-sectional view taken substantially along the line AA in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main frame as apparatus frame, 9 ... Original transfer path as paper transfer path, 28 ... First paper sensor, 29 ... Second paper sensor, 30 ... Support section, 31 ... Support section, 32 ... Engagement Engaging pieces as parts, 33 ... engaging pieces as engaging parts, 34 ... screwing parts, 35 ... screwing parts, 3
8 ... Board, 39 ... Board, 46 ... Screw.

Claims (1)

[Claims] 1. A mounting structure for a sheet sensor, which is arranged so as to face a sheet transfer path in an apparatus frame and detects a sheet transferred through the path, wherein an engaging portion and a screw are fixed to the apparatus frame. And a part of the paper sensor is engaged with the engaging part, and the other part of the sensor is screwed to the screwing part to attach the paper sensor to the device frame. Sensor mounting structure.