JPS6014270Y2 - Copy machine document feeder - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a document feeding device for a copying machine.

It is equipped with a document feeding belt wrapped around a belt roller, and by sandwiching the document between the belt and the contact glass, the document is fed onto the contact glass by the frictional force between the belt and the document, and there, the document is fed onto the contact glass. A document feeding device for a copying machine that performs exposure by irradiating light is well known.

In this type of device, since the original surface of the original is fed so as to rub against the contact glass, dirt such as ink and carbon from the original is likely to adhere to the contact glass.

This dirt, as well as dust and the like adhering to the contact glass, are transferred to the surface of the belt, and these dirts cause deterioration in the quality of copied images and instability in document feeding.

For this reason, conventionally it was necessary to periodically clean the surface of the belt or replace the belt, but cleaning and replacing the belt was not possible due to the structure of the belt roller being attached to the side plate of the feeder main body. Due to this problem, the entire device must be disassembled, which is not only time-consuming, but also requires the work to be entrusted to a specially skilled person.

SUMMARY OF THE INVENTION An object of the present invention is to provide a document feeding device that eliminates the above-mentioned conventional drawbacks and allows an operator to easily clean and replace the belt.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

In FIG. 1, 1 is a copying machine main body, 2 is a document feeding device, and the document feeding device 2 is rotatably and detachably attached to the copying machine main body 1 via a shaft 3, and the document feeding device 2 is the second
As shown in the figure, it can be opened more than 90 degrees relative to the copying machine main body 1.

As is already well known, the document feeding device 2 feeds the document 5 inserted in the direction of arrow A from the document insertion table 4 and sends the document 5 to the feed roller 6.
and the pinch roller 7, and feed it along the guide plate 8 to the belt conveying section 9.

The belt conveyance unit 9 includes a belt 12 for feeding documents wrapped around belt rollers 10 and 11.
2 is disposed so as to cover the exposure plate 13 (for example, contact glass) of the copying machine main body 1.

Note that the belt roller 10 is drivingly connected to a drive motor 14.

The original 5 conveyed by the belt 12 is stopped by a stop claw 15, where it is irradiated by an exposure lamp 16 and copied by a copying device (not shown).

After exposure, the original 5 is conveyed again by the belt 12, and then stored in the stacker 17 via a conveyance roller.

In the document feeding apparatus according to the present invention, the belt conveying section 9 is configured as a unit independent from the main body of the document feeding apparatus. Next, the belt conveying section 9 will be explained.

In FIGS. 3 and 4, a driving belt roller 10
is rotatably mounted on a frame 18.19, and the driven belt roller 11 is supported on the frame 18.19 via a belt tension release mechanism which will be described later.

As shown in FIG. 3a, the frames 18 and 19 are held within the main body side plates 20 and 21 of the document feeding device 2, and in this example, one end 18 of the frame is rotatably attached to the main body side plate 20, and the frame The other end 19 is detachably attached to the main body side plate 21.

That is, the frame 18 is connected to the main body side plate 20 via a hinge 22, and the frame 19 is provided with a locking device 23 for fixing to the main body side plate 21.

In FIG. 4, two locking devices 23 are provided, one on the left and one on the left.

This lock device 23 includes a lock pin 24, a pin holder 25 in which a groove is formed to engage with the lock pin, and a slider 26 that holds the lock pin 24 in engagement. Planted on 19th,
A pin holder 25 is fixed to the main body side plate 21.

Further, a guide groove 27 is formed in the slider 26, and a pin 28 attached to the frame 19 is fitted into the guide groove 27, so that the slider 26 can be moved horizontally in FIG. 4.

Ends of tension springs 29 are respectively engaged with the left and right sliders 26, and the left and right sliders 26 are respectively connected to arrows 13. B
'It is constantly subjected to elastic action in the direction of force.

A rotatable cam follower 30 is provided at mutually opposing ends of the left and right sliders 26, and the cam follower 30
is in pressure contact with the oval cam 31 disposed between the sliders 26 by the action of the tension spring.

The egg-shaped cam 31 is symmetrically formed vertically and horizontally, and when rotated from the position shown by the solid line to the position shown by the chain line in FIG. It is set in a shape that allows it to move in the B' force direction.

Note that 32 is a cam operating arm for rotating the egg-shaped cam 31.

The driven belt roller 11 is rotatably mounted on one end of a belt roller arm 33 as shown in FIG.
It is pivoted to.

A long hole 35 is formed at the other end of the belt roller arm 33.

A pin 36 is loosely fitted in the elongated hole 35 and is fixed to a click arm 37 which is pivotally connected to the frame 18.19.

The other end of a tension spring 38, which has one end fixed to the frame 18.19, is fixed to the pin 36.
8, the clinic arm 37, and the belt roller arm 33 constitute a belt tension release mechanism.

In the toggle mechanism, in the state shown in FIG. 4, the tension spring 38 rotates the click arm 37 counterclockwise about the shaft 37a, and the pin 36 fixed to the click arm 37 rotates in the direction of the elongated hole 35. The belt roller arm 33 is pressed clockwise about the shaft 34.

At this time, the click arm 37 presses against the stop pin 39 to position each of the above components, and in this state, the distance between the axes of the belt rollers 10 and 11 is maximized.

Note that 40 is a stop pin for stopping the belt roller arm 33 when the distance between the axes of the belt rollers 10 and 11 is shortened.

Next, a description will be given of an operation for removing the belt of the document feeding device configured as described above.

First, the document feeding device is S゛9009 as shown in Fig. 2.
00 turns, the cam actuating lever 32 of the locking device 23 is rotated from the position shown by the solid line to the position shown by the chain line in FIG. 4, and the oval cam 31 is rotated from the state shown by the solid line to the state shown by the chain line.

When the oval cam 31 rotates and reaches the state shown by the chain line, the cam follower 30 follows due to the action of the tension spring 29, and the left and right sliders 26 move in directions B and B', respectively.

At this time, the shape of the oval cam 31 is set so that the slider 26 moves to the position where the end of the slider 26 opens the groove of the pin holder, so that the locking device 23 is locked. It will be canceled.

When the locking device is released, the belt conveying section 9 can rotate in the direction of the arrow around the hinge 22 as shown in FIG. 3, and the belt conveying section 9 is retracted from the document feeding device.

In this state, a constant tension is applied to the belt 12, and since the belt cannot be easily removed, it is necessary to operate the belt tension release mechanism.

In FIG. 4, in order to release the belt tension, the belt roller 11 is simply pushed down in the direction of arrow C with a predetermined force, that is, a force that reverses the direction of the tension spring 38 with respect to the click arm 37. .

In this way, the belt roller arm 33 rotates counterclockwise about the shaft 34, and with this rotation, the click arm 37 rotates clockwise about the shaft 37a.

(Fig. 5) At this time, the click arm 3 of the tension spring 38
The direction of the elastic action on 7 changes, and the click arm 37
The direction is to rotate the clockwise.

Then, the action of the changed tension spring gives rotational action to the belt roller arm 33 in the direction of arrow C via the click arm 37, and the belt roller arm 33 is moved to the stop pin 40.
It stops when it comes into contact with.

This narrows the distance between the axes of the belt rollers 10 and 11, releases the tension on the belt 12, and allows the belt to be removed.

According to the above structure, the document feeding device 2 is rotated S90°, the lock is released by simply operating the cam operating lever 32, and the belt tension is increased by pushing down the belt roller 11 with a predetermined force. The belt can be removed with a very simple operation so that it can be released, and therefore the belt can be replaced or cleaned very easily.

Note that after replacement or cleaning, the belt may be attached by following the reverse procedure.

Further, the belt tension release mechanism of the above embodiment has the pin hole 36
Because the contact glass 13 and the belt 12 are loosely fitted into the elongated hole 35, when the document feeding device is twisted or lifted relative to the copying machine body, the gap between the contact glass 13 and the belt 12 is partially closed. It has the function of automatically correcting inconveniences that become increasingly serious.

Furthermore, if the amount of twisting and floating is less than the play of the pin 36, the stop claw 15 formed on the belt roller arm works until it hits the contact glass 13, and the gap between the belt and the contact glass is automatically adjusted. It will be done.

FIG. 6 shows another embodiment of the belt tension release mechanism. In this example, the frame 18 is mounted so that it can be folded in half, and its mounting point 41 is connected to the center line connecting the axes of the belt rollers 10 and 11. It is located above 1.

Therefore, the frame 18b on the belt roller 11 side tries to rotate counterclockwise due to the tension of the belt 12, but is held by being pressed against the stop pin 42 fixed to the frame 18a.

To release the belt tension, the frame 18b may be rotated clockwise as shown by the chain line, and for this purpose a rotation lever may be attached to the frame 18b.

The present invention is advantageous in that it is easy to remove and install the belt as described above, and even an ordinary operator can replace and clean the belt.

Although preferred embodiments of the present invention have been described above, the present invention should not be limited to the above embodiments.

For example, as the locking device, an appropriate means that can position and fix the frame and the main body side plate can be used.

It goes without saying that any suitable belt release mechanism can be used as long as it can narrow the distance between the axes of the belt rollers.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the usage state of the document feeding device according to the present invention, FIG. 2 is an explanatory diagram showing the rotating state of the document feeding device, and FIG. 3 is an explanatory diagram showing the rotation state of the document feeding device, and FIG. 3 is the line Explanatory diagram as seen from the direction, 4th
5 is a cross-sectional view of the belt conveyance section showing a state in which the belt tension is released, and FIG. 6 is an explanatory view showing another embodiment of the belt tension release mechanism. 2... Original feeding device, 10, 11...
Belt roller, 12...Belt, 13...
...Exposure plate, 18°19...Frame, 22.
...Hinge, 23...Lock device.

Claims (1)

[Scope of utility model registration request] Copying that is equipped with a document conveying belt wrapped around a plurality of belt rollers, and by sandwiching the document between the belt and an exposure plate, the document is fed onto the exposure plate by the frictional force between the belt and the document. In a document feeding device of a machine, the belt includes a belt roller around which the belt is wound, a frame rotatably supporting the belt roller, and a belt tension release mechanism interposed between the frame and at least one belt roller. A conveyance unit is provided, one side of the belt conveyance unit is rotatably supported on the document feeder body, and the other side is removably attached to the document feeder body via a locking device. The feeding device.