JP2001133905A - Picture reader - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use one fixing pin member to fix two carriages to a main body frame when transporting a picture reader and to easily attach and detach this fixing pin. SOLUTION: A fixing pin 30 is inserted to insertion holes provided in a bottom plate 3 of a main body frame 2 and two frames 12 and 16 to fix a full-rate carriage 11 and a half-rate carriage 15 which are provided as a scanner of a picture reader. After elasticity of an elastic claw part 37 in the lower end part is used to detain claw members provided in respective part, the fixing pin 30 is fixed and held by the elastic claw part 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a means for fixing two carriages constituting a scanning device of an image reading apparatus.
In particular, the present invention relates to a device that can easily fix and hold the two carriages to the main body frame when transporting the image reading device.

[0002]

2. Description of the Related Art In an image reading apparatus provided in combination with an image forming apparatus such as a facsimile apparatus or a copying machine, a scanning apparatus is arranged along the lower surface of a platen on which an original is set, and the scanning apparatus is moved in a sub-scanning direction. It is provided as possible. The scanning device includes a full-rate carriage provided with a lamp as a light source and a first mirror, and a half-rate carriage provided with two mirrors (second and third mirrors). The scanning device follows the movement of the full-rate carriage. The half-rate carriage is configured to move at half speed. Then, the light of a lamp provided on the full-rate carriage is irradiated on the image surface of the original, the reflected light is reflected via a plurality of mirrors and the like, and the image is formed by a lens toward photoelectric conversion means such as a CCD. The optical signal is converted into an electric signal, and the CCD outputs an image signal as a digital signal. The digital signal obtained as described above is used not only as a transmission signal of the facsimile apparatus but also transmitted to the writing means in the image recording section of the copying machine, and used to write the optical information on the photosensitive member.

[0003]

The two carriages arranged in the scanning device are slid on guide rail members provided in the main body frame so as to be movable at the time of reading an image of a document. I have. In the case where the image reading device is assembled at a factory and then transported and delivered to a user, for example, the two carriages of the scanning device are immovably fixed, and even if a shock or the like during transportation is applied, the two carriages are not moved. It is protected so that the provided mirrors and the like are not affected.
In order to fix the two carriages, conventionally, two carriages are individually fixed to the main body frame, and the two carriages are fixed by one fixing means. As the fixing means, for example, the main body frame and the carriage are fixedly held using an insertion member such as a bolt and an auxiliary fixing member. There is a problem in that it is troublesome to remove the fixing means when setting the device to a usable state.

An object of the present invention is to provide a fixing means which can easily fix two carriages to a main body frame by using one member having a simple structure, and can be easily removed.

[0005]

SUMMARY OF THE INVENTION The present invention relates to an image reading apparatus for reading a document image by moving a scanning member comprising a full rate carriage and a half rate carriage disposed below a platen glass. According to a first aspect of the present invention, the two carriages are provided with locking holes, and a fixing pin inserted from a bottom plate of a main body frame of the apparatus is inserted into the locking holes of the two carriages. Is fixed integrally with the main body frame. Therefore, when the image reading apparatus is transported, the scanning body can be easily fixed by using the fixing pin having a simple structure.

The invention according to claim 2 is characterized in that an elastic body is provided at one end of the fixing pin on the body frame side, and a locking portion for locking to a full rate carriage is provided at the other end. Then, the impact is absorbed by the elastic action of the fixing pin, and the work of attaching and detaching can be easily performed.

According to a third aspect of the present invention, the locking portion provided at the other end of the fixing pin is formed in a shape that can be inserted through a locking hole provided in the full rate carriage, and by rotating the fixing pin. It is characterized in that it has a shape that can be locked on the upper surface of the full rate carriage. By using the fixing pins, the carriage can be fixed satisfactorily.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The configuration of an image reading apparatus according to the present invention will be described with reference to the illustrated example. The example shown in FIG.
FIG. 2 is a side view of the image reading apparatus 1, showing an apparatus applicable to a multifunction peripheral with a copying machine or a facsimile apparatus or an image reading apparatus used as a scanner for a personal computer. In the image reading apparatus 1, a platen 5 is disposed on an upper portion of a main body frame 2, and an image of a document D set on the platen 5 is scanned by a scanning device 10 that reciprocates in a sub-scanning direction along a lower surface of the platen 5. It is configured to read. For the original set on the platen 5, the elastic body 4 of the platen cover 4 positioned on the upper surface thereof
By pressing a, the image surface of the document is brought into close contact with the platen 5 to enable reading.

A scanning device 10 in which the platen 5 is disposed inside a frame in which the platen 5 is disposed is provided with a full-rate carriage 11 in which a lamp 13 and a mirror m1 are disposed, as in an image reading device generally used in the related art. Half-rate carriage 15 on which two mirrors m2 and m3 are arranged
Are movably provided. The two carriages 1
The driving device 6 for driving the first and the first 15 has the two carriages 11 and 15 mounted on belts 9 and 9a wound around pulleys 8 and 8a provided on a driving shaft 7, respectively.
The two pulleys 8 and 8a are formed so that the diameter of the pulleys 8 and 8a is 2: 1 so that the half-rate carriage 15 is driven at half the speed of the full-rate carriage 11.

In the image reading apparatus 1, a full-rate carriage 11 that moves at a constant speed in the length direction of a document,
The half-rate carriage 15, which is moved at half the speed of the full-rate carriage 11, is reciprocally moved in conjunction with the half-rate carriage 15, and the light of the lamp 13 irradiates the image surface of the document set on the platen 5. Then, the reflected light of the light illuminating the original is reflected via mirrors m1, m2 and m3 provided on the two carriages 11 and 15, respectively.
Is reflected on the CCD 19 through the lens 18,
A digital signal obtained by converting optical information into an electric signal is output to a processing device such as a copying machine combined with an image reading device. Image information as a digital signal obtained by the CCD 19 can be used as a transmission signal in a facsimile machine. When the image reading apparatus is used in combination with a copying machine or a multifunction machine including a facsimile machine and a copying machine, the image information can be transmitted to a recording unit and printed on a recording sheet. Further, when the image reading device is used in combination with a computer or the like, the image reading device is also used to create a document or the like combined with other arbitrary information using the image information.

The full-rate carriage 11 and the half-rate carriage 15 are configured as shown in FIG.
Places the lamp 13 at a predetermined position on the frame 12.
Also, a mirror m arranged on the half-rate carriage 15
2 and m3 are arranged using a mirror holder 17 mounted and fixed to the carriage frame 16.

As shown in FIG. 2, the two carriages 11 and 15 constituting the scanning device 10 and the bottom plate 3 of the main frame 2 are provided with pin insertion holes for mounting fixing pins during transportation. 20, 22, and 24 are arranged respectively.
Each of the pin insertion holes is provided with an enlarged portion on both sides of a circular hole. For example, the insertion hole 20 is integrally provided with enlarged portions 21 on both sides thereof, and a fixing pin 30 is provided. And a claw member protruding from the side of the rod body can be inserted. The frame upper plate 12a of the full-rate carriage 11 and the frame 16 of the half-rate carriage 11 have insertion holes 22, 24 and expanded portions 23, 25, respectively.
And are arranged. The pin insertion holes 20, 22, 24
Are arranged in pairs in the main scanning direction of the image reading apparatus at the same intervals.
When the pins 1 and 15 are moved in the sub-scanning direction in FIG. 1, they are formed at positions where the pin insertion holes 20, 22, and 24 overlap.

The pin insertion holes 20 provided in the bottom plate 3 of the main body frame 2 and the pin insertion holes 22 and 24 provided in the two carriages 11 and 15 are positioned at vertically overlapping positions to fix the fixing pins 30. FIG. 3 shows a state where the camera is mounted. As shown in FIG. 3, the two carriages 11, 1
5 and pin insertion holes 2 provided in the bottom plate 3 of the main body frame, respectively.
0, 22, and 24 are stopped so as to overlap, and the fixing pin 30 is inserted from the lower surface of the bottom plate 3 and rotated by 90 °, so that the two carriages are held at the fixed position using the fixing pin 30. Can be.

A fixing pin 30 used to fix the two carriages is configured as shown in FIG. 4, and is integrally formed using a plastic material such as polypropylene. The elastic claw portion 37 formed as a thin member at the portion can exhibit particularly large elasticity. FIG. 5 is a plan view of the fixing pin 30 as viewed from above while the fixing pin 30 is mounted, and FIG. 6 is a state of the lower part viewed from the line AA. FIG.
As shown in FIG. 6, the fixing pin 30 is a small-diameter upper rod 3.
1 and a lower rod 35 having a large diameter. An upper claw 32 and an intermediate claw 33 are provided on the top and lower parts of the upper rod 31 so as to protrude to both sides via a shaft. Further, a lower rod 3 connected to a lower end of the upper rod 31 is formed.
5 is provided with a wide and long elastic claw 37 integrally provided at the lower end thereof, and a lower claw 36 disposed above the elastic claw 37 at a predetermined interval. The fixing pin 30 is fixed in a state where the fixing pin 30 is positioned on the bottom plate and pressed from below by the elastic claws 37.

Frame 1 of the half-rate carriage
6, an intermediate claw 33 is located on the upper surface, and a lower rod 35
The frame 16 is fixed between these steps. Further, the upper plate 12a of the full-rate carriage 11 performs a fixing operation with the upper end claw 32 positioned above the upper plate 12a. As described above, in order to fix the two carriages 11 and 15 using one fixing pin 30, three claw members 32, 33, and 3 provided on the fixing pin 30 are used.
6 are formed so as to protrude in the same direction.
The elastic claws 37 provided at the lower end of the zero are disposed so as to protrude in the same direction or an arbitrary direction. Then, through the expanding portion provided in each of the pin insertion holes 20, 22, 24,
After the claw member of the fixing pin 30 is mounted, the claw member is turned at an angle of 90 degrees with respect to the axis, so that the claw member is locked at a position outside the expanded portion as shown in FIGS. Is pressed against the lower surface of the bottom plate 3 to maintain the fixed state.

As shown in FIG. 3, when the image reading apparatus is transported or moved in a state where the fixing pins 30 are mounted and the two carriages 11 and 15 are fixed, the fixing is released by the user. Then, on the lower surface of the bottom plate 3 of the main body frame, the fixing pin 30 is turned by 90 ° about the axis through the elastic claw portion 37 or another projecting member. And
By pulling down the fixing pin 30 at a position where each claw member coincides with the enlarged portion of the insertion hole, the two carriages 11,
15 can be released. Further, the fixing pins 30 removed as described above are mounted on a holding portion provided on the frame of the image reading apparatus and stored, so as to cope with the next operation such as movement.

In the fixing pin 30, the two rod members, the upper rod 31 and the lower rod 35, can be configured to have a cross-shaped cross section. Any configuration is possible. Also, in the claw member provided as the locking means, the shape of the portion to be protruded to the side, the length of the protrusion, etc. can be arbitrarily set. It can be configured to correspond to the shape of the hole. Further, when the interval between the stop portions of the plate members of the two carriages 11 and 15 is large, the height of the intermediate claw 33 may be increased, or may be changed to any other shape. It is.

[0018]

Since the image forming apparatus of the present invention is constructed as described above, two carriages are provided with locking holes, and the fixing pins inserted from the bottom plate of the main body frame of the apparatus are used as the above-mentioned two. By inserting the two carriages into the locking holes of the two carriages and fixing the two carriages integrally with the main body frame, the fixing of the scanning body can be performed using a simple fixing pin at the time of transportation of the image reading apparatus or the like. It can be done easily.
In addition, an elastic body is provided at one end of the fixing pin on the main body frame side, and a locking portion for locking to the full rate carriage is provided at the other end. Can also be easily performed. Further, a locking portion provided at the other end of the fixing pin is formed in a shape that can be inserted through a locking hole provided in the full rate carriage, and is locked on the upper surface of the full rate carriage by turning the fixing pin. The carriage can be satisfactorily fixed by using the fixing pins.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram illustrating a configuration of an image reading device.

FIG. 2 is a plan view of two carriages.

FIG. 3 is an explanatory diagram of a state where two carriages are fixed.

FIG. 4 is an explanatory diagram showing a configuration of a fixing pin.

FIG. 5 is a plan view of an upper end portion of the fixing portion.

FIG. 6 is a plan view taken along line AA of FIG. 4;

[Explanation of symbols]

1 image reading device, 2 main body frame, 3
Bottom plate, 4 platen cover, 4a elastic body, 5
Platen, 6 drive, 7 drive shaft, 8
Pulley, 9 belt, 10 scanning device, 1
1 full rate carriage, 12 frames, 1
3 ramps, 15 half rate carriage, 1
6 frames, 17 mirror holders, 18
Lens, 19 CCD, 20/22/24 pin insertion hole, 21/23/25 expanding part, 30 fixing pin, 31 upper rod, 32 upper end claw, 33
Intermediate pawl, 35 lower rod, 36 lower pawl, 37 elastic pawl.

Claims (3)

[Claims] 1. An image reading apparatus for reading a document image by moving a scanning body comprising a full rate carriage and a half rate carriage disposed below a platen glass, wherein said two carriages are provided with locking holes. An image reading apparatus, wherein a fixing pin inserted from a bottom plate of a main body frame of the apparatus is inserted into a locking hole of the two carriages, and the two carriages are fixed integrally with the main body frame. 2. The fixing device according to claim 1, wherein an elastic body is provided at one end of the fixing pin on the main body frame side, and a locking portion for locking to a full rate carriage is provided at the other end. Image reading device. 3. A locking portion provided at the other end of the fixing pin is formed in a shape that can be inserted through a locking hole provided in the full rate carriage, and by rotating the fixing pin, an upper surface of the full rate carriage is formed. The image reading device according to claim 1, wherein the image reading device has a shape capable of engaging with the image reading device.