JPH04329753A - Sheet document reader - Google Patents

Abstract

PURPOSE:To make the size of the reader small and to reduce the cost by using a document tip sensor in common with a maintenance cover switching sensor. CONSTITUTION:This reader is provided with a maintenance guide 1 having an automatic document feeder, provided to replace a pickup roll 5 and a feed roll 6 of the automatic document feeder, turnable around a fulcrum and having a stopper structure of a lever section of a document tip sensing means 2, a pressure spring 3 pressing the document tip sensing means 2 onto the said stopper, a document presence detection means 4 detecting whether or not a document is set, a document carrier section 14 and a read section.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a sheet document reading device, and more specifically, it can be applied to facsimiles, digital copiers, sheet scanners, etc., and in particular, it is a sheet document reading device that can reduce the size and cost of equipment. Regarding equipment.

0002

2. Description of the Related Art In recent years, the need for faster and larger information processing has been rapidly increasing, and the demand for sheet document reading devices is no exception. However, contrary to these demands, the lifespan of paper feed rollers and the like has become extremely short because the system has not been fundamentally updated.

[0003] Therefore, the demand for improving the maintainability of paper feed rollers has naturally increased in line with the above-mentioned demand, and it has become an essential condition for recent equipment that paper feed rollers and the like can be easily replaced. Ultimately, service costs (maintenance costs) will be significantly lower if replacement can be done without screws, that is, without the use of tools.

0004

[Problems to be Solved by the Invention] However, when the above-mentioned screwless method is adopted, problems such as forgetting to close the maintenance cover or half-locking tend to occur.In order to prevent this, maintenance covers are required. An opening/closing detection sensor is required, and if this opening/closing detection sensor is introduced, the equipment becomes larger and costs become higher.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a sheet document reading device that can downsize the device and reduce costs by using a document leading edge detection sensor that also serves as a maintenance cover opening/closing detection sensor. There is.

[0006]

[Means for Solving the Problems] In order to achieve the above object, a sheet document reading device according to the present invention has an automatic document feeder, and is provided for replacing a pickup roller and a feed roller of the automatic document feeder, A maintenance guide which is rotatable about a fulcrum and has a stopper structure for a lever portion of a document leading edge detection means, a pressure spring which presses the document leading edge detection means against the stopper, and a pressure spring which detects whether or not a document is set. The apparatus includes a document presence/absence detecting means for detecting the presence or absence of a document, a document conveying section, and a reading section.

[0007]

[Operation] In the present invention, as shown in FIGS. 1 and 2, the opening and closing of the maintenance guide 1 can be detected without using a special cover opening/closing sensor by the interlocking operation of the maintenance guide 1 and the document leading edge detection sensor 2. Therefore, it is possible to realize downsizing and cost reduction of the equipment.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained below based on the drawings. FIG. 1 is a schematic diagram showing the configuration of a sheet document reading device according to an embodiment of the present invention. In FIG. A maintenance guide 1 is provided for maintenance of the separating section, particularly for replacing the pickup roller 5 and the feed roller 6, is rotatable about a fulcrum O, and has a stopper structure for the lever section of the document leading edge detection sensor 2. There is. It is placed below the document leading edge detection sensor 2,
It has a pressure spring 3 that presses the document leading edge detection sensor 2 against a stopper, a document presence/absence detection sensor 4 that detects whether or not a document is set, a document transport section 14 (8 to 13), and a reading section. It has become.

Next, FIG. 2 is a perspective view showing the configuration of a sensor section according to an embodiment of the present invention. In FIG. 2, the same reference numerals as in FIG. 1 indicate the same or corresponding parts, and 21
a is a sensor lever, 21b is a shutter, and 21c is a photointerrupter. In this embodiment, opening/closing of the maintenance guide 1 is detected by a claw portion 20 on the maintenance guide 1, a document leading edge detection sensor 2, and a pressure spring 3. Next, FIGS. 3 and 4 are diagrams for explaining the operation according to one embodiment of the present invention. In FIG. 3, the same reference numerals as those in FIGS. 1 and 2 indicate the same or corresponding parts.

Here, FIG. 3(a) shows the maintenance guide 1 in an open state for maintaining the paper feed roller 5 and feed roller 6, or in a half-locked state (half-open). At this time, since the claw 20 of the maintenance guide 1 is released, the document leading edge detection sensor 2 is applied an upward force by the pressure spring 3, and is placed coaxially with the center of rotation of the sensor lever 21a. , the rotatable light-shielding shutter 21b is the photointerrupter 21
Turn on c. When a document is inserted in this state, the document presence/absence detection sensor 4 is turned on, and the document leading edge detection sensor 2 is also turned on. Since this state cannot normally occur, the system determines that the cover is open (see FIG. 4).

Next, FIG. 3(b) shows the maintenance guide 1.
In this state, the claw 20 of the maintenance guide 1 pushes down the lever part of the document leading edge detection sensor 2 to the normal state, the document leading edge detection sensor 2 is turned off, the document is set, and the process continues as usual. The document can be fed, and the leading edge of the document can also be detected as shown in FIG. 3(c).

As described above, in this embodiment, due to the interlocking operation of the maintenance guide 1 and the document leading edge detection sensor 2,
Since the opening/closing of the maintenance guide 1 can be detected without using a special cover opening/closing sensor, it is possible to downsize the device and reduce costs.

[0013]

According to the present invention, by using a sensor for detecting the leading edge of a document and also serving as a sensor for detecting opening/closing of the maintenance cover, it is possible to downsize the apparatus and reduce costs.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing the configuration of a sheet document reading device according to an embodiment of the present invention.

FIG. 2 is a perspective view showing the configuration of a sensor section according to an embodiment of the present invention.

FIG. 3 is a diagram illustrating an operation according to an embodiment of the present invention.

FIG. 4 is a diagram illustrating an operation according to an embodiment of the present invention.

[Explanation of symbols]

1 Maintenance guide 2 Original edge detection sensor 3 Pressure spring 4 Original presence/absence detection sensor 5 Pick up roller 6 Feed roller 14 Original transport section

Claims (1)

[Claims] Claim 1: An automatic document feeder comprising a pickup roller (5) and a feed roller (5) of the automatic document feeder.
6), which is rotatable about a fulcrum and has a stopper structure for the lever part of the document leading edge detection means (2); A pressure spring (
3), a document presence/absence detection means (4) for detecting whether or not a document is set, a document conveying section (14), and a reading section.