JPH0331132A - Overhead projector - Google Patents

Abstract

PURPOSE:To automatically feed a manuscript on a manuscript mount section without impairing the miniaturization of a device by providing a fed manuscript storage section and a discharged manuscript storage section in a support base, and conveying the manuscript while the support base is erected. CONSTITUTION:A manuscript stored in a fed manuscript storage section 24a is conveyed to the position where the contact with a holding roller 42 is secured on a manuscript mount section 18 by the drive of manuscript conveying means 40 and 44 and the holding roller 42, and the manuscript is projected at this position while a support base 12 is erected on a base 10. The manuscript is subsequently carried into a discharged manuscript storage section 24a and automatically stocked by the drive of the holding roller 42 and manuscript conveying means 40 and 44.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an overhead projector in which a support base for supporting an optical system is rotatably attached to a base having a document placement section. .

(Prior Art) Traditionally, overhead projectors have two types: a transmissive type that shines light from below the document and reflects it onto a mirror above, and a reflective type that shines light from above the document and reflects it below the document. Of these, especially the reflective type,
It has the advantage of being small and lightweight, but in order to make it easier to carry, a device has also been developed in which a support stand that supports the optical system is foldable with respect to a base having a document placement section.

On the other hand, in recent years, in order to save the effort of setting a document on the document placement section in such an overhead projector, a device incorporating a device for automatically conveying the document has been proposed. Specifically, JP-A-61-123
As shown in Publication No. 437, two cassettes, a paper feed cellar 1= and a collection cassette, are provided below the document placement section, and while the document is inverted from the paper feed cassette to the document placement section above. After being carried out, the original is carried into a collection cassette below, or the automatic document feeder (ADF) installed in a copying machine has a paper feeder installed on one side of the original placing unit. There are known devices in which a tray is provided and a paper discharge tray is provided on the other side.

[Problem to be solved by the invention]

In the A-bar Rad projector described in the above publication, it is necessary to transport the original from the paper feed cassette located below the original document tray after it has been inverted 1800 degrees upwards, and a certain inversion radius must be ensured. Must be. Therefore, it is necessary to provide a certain distance or more between the document placement section and each JJ set, and a large installation space is required below the document placement section, which hinders miniaturization of the device. becomes.

In particular, since the purpose of a foldable overhead projector is to be miniaturized, it is very difficult to apply this device.

Also, unlike a copying machine, an overhead projector must pass light through the space above the document, and the above-mentioned AD
It is not possible to use a conveyor belt that spreads over the entire surface of the contact glass as in F. Therefore, conventionally, as shown in the above-mentioned publication, measures have been taken such as moving the feed roller up and down as appropriate on the side of the document placement section, which has led to a complicated structure.

On the other hand, even in the case where lays 1 are provided on both sides of the original document placement section, additional installation space must be added for this purpose, which inevitably increases the size of the apparatus.

In view of these circumstances, it is an object of the present invention to provide an overhead projector that is capable of automatically transporting documents into and out of a document placement section using a cylinder structure without hindering miniaturization of the entire device. purpose.

[Means to solve the problem]

The present invention includes a base having a document placement section, and a support that is rotatably attached to the base in a raised position and a lowered position, and is provided with an optical system on its head. In the overhead projector, a fed document storage section and a discharged document storage section are provided in the support base, and a path from the fed document storage section to the document placement section and a passageway from the document placement section to the discharged document storage section are provided. A document transport means is provided in the passage leading to the storage section,
A holding roller that can rotate in both forward and reverse directions is provided at the entrance of the document placement section, and when the document is carried out from the fed document storage section with the support stand in the upright position, the end portion of the document and the holding roller Controlling the driving of the document conveyance means and the holding roller so as to convey the document onto the document placement section to a position where contact with the document placement section is ensured, and to carry the document from the document placement section to the ejected document storage section. It is equipped with control means to

[For production]

According to the above configuration, with the support stand standing upright with respect to the base, the document stored in the fed document storage section is moved onto the document placement section by the drive of the document transport means and the holding roller. The original is transported to a position where contact is ensured, and the projection of the original is performed at this position. Thereafter, the document is carried into the ejected document storage section by the drive of the holding roller and the document conveying means, and is automatically stocked.

〔Example〕

An embodiment of the present invention will be described based on the drawings.

The overhead projector shown here includes a base 10 having a rectangular shape in plan view, and a support 12 having a planar shape that almost matches the base 10. (lower end) is attached to one side edge of the base 10 so as to be rotatable (foldable) about the horizontal axis 14.

That is, the support stand 12 has an upright position (use position) as shown in FIG. 3 with respect to the base 10, and a fall position (storage position) as shown in FIG.

Further, an outer cover 13 as shown in FIGS. 5 to 8 is provided between the base 10 and the support 12. This outer cover 13 is partially or entirely composed of a spring, and has a degree of freedom to expand and contract in response to opening and closing of the support base 12.

An optical system unit 16 is provided at the head of the support stand 12. Four large openings are formed on the upper surface of the base 10, and a Fresnel lens (original resting section) 1 is placed inside these recesses.
8 is disposed, and a reflection mirror (not shown) is disposed below this Fresnel lens 18.

The optical system unit 16 includes a light irradiation lamp 19, a lens 20, a projection mirror 22, etc.
2 can be raised and lowered to a desired angle with respect to the support base 12.

Next, the document conveyance mechanism installed in this overhead projector will be explained.

Inside the support stand 12, there is an inner tray 24a and an outer tray 24 that extend over almost the entire area and open upward.
b is provided, and the opening is closed with M25. At the bottom of these trays 24a, 24b, locking claws 26 as shown in FIG. 4 are provided, and as shown in FIGS. A rotating presser plate 28 and a compression spring 30 that urges the presser plate 28 toward the locking claw 26 are provided, and the lower end of the document 32 is held between the locking claw 26 and the presser plate 28. It is now possible to

A lever 34 as shown in FIG. 5 is provided on each presser plate 28 to project sideways, and this lever 34 is led out to the outside of the support base 12 through a long hole 36 provided in the side wall of the support base 12. By operating this lever 34 from the outside, the holding plate 28 can be manually rotated.

Near the lower end of each tray 24a, 24b, oval conveyance rollers (document conveyance means) 36a, 36b and circular conveyance rollers (document conveyance means) 38a, 38b are arranged. A cleaning pad (original transport means) 40 is provided at the contact position. The cleaning pad 40 is made of cloth, sponge, or the like, and cleans the surface of the original 32 by coming into contact with it.

Note that in this embodiment, the conveyance rollers 36a, 3
The shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape of the shape 6b 6b is elliptical in the circumferential direction changes in the circumferential direction as long as it changes toward the original 32 and moves toward and away from the document 32 as it rotates.

On the other hand, a retaining roller 42 extending in the width direction (depth direction in FIG. 1) holds a bracket 43 (FIG. 3) at the proximal peripheral edge (entrance portion) of the Fresnel lens 18 disposed on the base 10. A cleaning pad (original conveying means) 44 is also provided at a position on the base 10 side in contact with the holding roller 42 .

A path switching pawl 46 is provided between the holding roller 42 and each conveying roller 38a, 38b. This passage switching pawl 46 is connected to a switching solenoid 48 (see FIG. 9 below).
By driving the holding roller 42, the holding roller 42 is switched between the position shown in FIG. 6 and the position shown in FIGS. 7 and 8.
A passage connecting the outer tray 1 to the tray 24b and a passage connecting the holding roller 42 and the inner tray 24a are alternately formed.

Further, document detection sensors 51 and 52 are provided at upstream and downstream positions of the holding roller 42, respectively, and their detection signals are input to a control device 50 as shown in FIG. There is.

This control device 50 controls each transport roller 3 based on detection signals from various sensors including the sensors 51 and 52, and input signals from operation buttons 54 arranged at appropriate positions on the main body.
6a, 36b, 38a, 38b1 The drive control of the holding roller 42 and the switching solenoid 48 is performed.

Next, the operation of this overhead projector will be explained.

First, as shown in FIGS. 1 and 3, the support stand 12
With the tray in the upright position, M25 above each tray in the support stand 12 is opened (double-dashed line in FIG. 1), and originals are loaded into the inner tray 24a. In this overhead projector, the inner tray 24a and the outer tray 24b are configured to alternately serve as a fed document storage section and a discharged document storage section. , the case where the outer side 1 to the lay 24b are used as a discharged document storage section will be described.

As shown in FIG. 5, the specific procedure for the above set is to rotate the presser plate 28 by operating the lever 34 protruding from the presser plate 28 of the inner side 1 to the lay 24a. A gap is created between the plate 28 and the locking claw 26.

After inserting the lower end of the original 32 into this gap,
When the lever 34 is released, the lower end of the document 32 is held between the holding plate 28 and the locking claw 26 by the elastic force of the compression spring 30. At this time, the manuscript 32 has its front (
Set so that the (down) side faces the presser plate 28.

In this state, by operating the operation button 54,
First, one document 32 is carried out from the inner tray 24a,
The terminal end of the original 32 (the eighth
It is carried out to a position where the left end (in the figure) comes into contact with the holding roller 42. Then, when the projection of the original 32 is completed, the operation button 54 is operated again, so that the original 32 is carried into the outer tray 24b, and the next original 32 is carried out from the inner tray 24a. is started.

This operation will be explained in detail with reference to the time chart of FIG. First, the original 3 on the Fresnel lens 18
2, when the operation button 54 is operated (point A in FIG. 10), a control signal is output from the control device @ 50 to the holding roller 42 and the switching solenoid 48, and the holding roller 42 switches to the Figures 5-8 clockwise (rightward)
By rotating the original 32 on the Fresnel lens 18, the movement of the original 32 on the Fresnel lens 18 is started, and the passage switching claw 46
The position is switched to the position shown in FIG. 6, that is, the position forming a passage from the holding roller 42 to the outer tray 24b. Thereafter, the conveyance roller 38b is rotationally driven to start carrying the document 32 into the outer tray 24b.

Note that if the document detection sensor 52 does not detect a document at the time when the operation button 54 is operated (for example, when feeding the first document), it is determined that there is no document on the Fresnel lens 18. The document collection operation is not performed.

Next, the final edge of the transported original 32 is detected by the original detection sensor 51.
At the point in time (point B), the drive of the holding roller 42 is stopped, the transport rollers 36a and 38a are rotationally driven, and the operation of transporting the next document 32 from the inner tray 24a is started (point B). (Status shown in Figure 6). Then, the driving of the conveyance roller 36a is stopped while the conveyance roller 36a has rotated half a rotation, and the path switching pawl 46 is switched to the position shown in FIG. By rotating the holding roller 42 in the opposite direction (to the left in the figure), the document 32 begins to be fed onto the Fresnel lens 18 (the state shown in FIG. 7).

On the other hand, on the side of the outer tray 24b, a conveyance roller 36b is rotationally driven, and the long diameter portion of this conveyance roller 36b holds down the entire original document 32 carried in, as shown in FIG. By pushing down the plate 3 28 against the elastic force of the compression spring 30, the final conveyance of the document 32 is started. Then, the holding plate 28 is released while the conveying roller 36b has rotated half a rotation, and the carried-in original 32 is sandwiched between the holding plate 28 and the locking claw 26 together with other originals. At this point, the rotation of the transport roller 38b is also stopped, and the conveyance of the original 32 is completed.

After that, the original 32 is carried out from the inner tray 24a.
The time when the document detection sensor 51 detects the final end of the document (0 point)
Then, the path switching claw 46 is returned to the intermediate position, and the drive of the holding roller 42 is stopped, so that the conveyed document 32 is set on the Fresnel lens 18 at a position where its terminal end contacts the holding roller 42. The state shown in FIG. 8 is reached. Therefore, in this state, the document 32 can be recovered by again rotating the holding roller 42 in the clockwise direction in the figure.

Note that after all the documents 32 have been carried into the outer tray 34b, by performing the reverse operation to the above, the outer tray 24b is transferred to the document feed tray and the inner tray 2.
4a can be used as a document discharge tray.

As described above, according to this overhead projector, a necessary document can be automatically supplied onto the Fresnel lens 18. Moreover, since the document storage section 32 is all accommodated within the support stand 12, this does not hinder miniaturization of the overhead projector.

Here, in a conventional device in which a paper feed section and a paper ejection section are provided below the Fresnel lens 18, a large space is required to secure a radius for reversing the document 1800 degrees, but in this overhead projector, The base 10 stands from the support stand 12 that stands up to nearly 900 degrees with respect to the stand 10.
Since the original 32 is carried out at the same time as the original 32 and then carried into the support table 12, there is no need for space for reversing the original, and the size is reduced to almost the same level as an overhead projector that does not have an automatic original transport mechanism. It is possible to advance the development of

5 Furthermore, when conveying the document 32 onto the Fresnel lens 18, the conveyance is stopped at a position where contact between the end of the document 32 and the holding roller 42 can be ensured.
2 can be recovered by simply rotating the holding roller 42 in the opposite direction, and no complicated structure is required. Further, this holding roller 42 also has the effect of holding the document during projection. Moreover, the holding roller 42 holds the original 32
Since it only comes into contact with the terminal end of the document 32, it does not have any influence on the projection of the document 32.

Furthermore, if a passage switching claw 46 as shown in this embodiment is provided, the document can be guided to each tray 24a, 24b more reliably, and both trays 24a, 24b can be alternately switched between the document storage section and the output section. It becomes possible to use it as a paper document storage section.

Note that the present invention is not limited to such embodiments, and may take the following embodiments as examples.

(1) In the above embodiment, two trays, an inner tray and an outer tray, are provided, but in the present invention, only a single tray, which serves as a fed document storage section and a discharged document storage section, is provided. You can also do this. In this case, for example, the document stack may be fed from one side and ejected from the other side.

(2) In the above embodiment, the cleaning pad 40°44
Although the document is conveyed by the rollers and rollers, it is of course possible to convey the document by a pair of rollers that are in pressure contact with each other as in a general apparatus.

(3) In the above embodiment, the timing for stopping the fed document is determined based on the detection signal of the document detection sensor, but if the size of the document to be set is fixed,
The timing may be set based on the amount of rotation of each roller. In this case as well, it is necessary to stop the supplied document 32 at a position where its trailing end comes into contact with the holding roller 42 .

(4) In the present invention, the number, specific shape, and structure of the document conveyance means and holding rollers are not limited.

〔Effect of the invention〕

As described above, the present invention provides a feeding document storage section and a discharging document storage section in the support stand of a foldable overhead projector, and transports the document with the support stand in an upright position. Therefore, by utilizing the existing space, it is possible to automatically feed the original onto the original document placement section without hindering the miniaturization of the apparatus.

Moreover, since the holding roller maintains contact with the original while the original is fed onto the original placing section, the original can be retrieved and held during projection with a simple configuration of simply rotating the holding roller. be able to. Furthermore, since the holding roller only contacts the trailing edge of the document, it does not affect the projection of the document in any way.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view of an overhead projector according to an embodiment of the present invention, FIG. 2 is a side view showing the overhead projector in a stored state, FIG. 3 is a perspective view showing the overhead projector in an expanded state, and FIG. The figure is a front view showing the document locking structure of the overhead projector, Figures 5 to 8 are cross-sectional side views showing the main parts of the overhead projector, and Figure 9 is the control device provided in the overhead projector. FIG. 10 is a block diagram showing the input and output of the controller, and FIG. 10 is a time chart of control signals output by the controller. DESCRIPTION OF SYMBOLS 10... Base, 12... Support stand, 16... Optical system unit, 18... Fresnel lens (document placement part),
24a...inner tray (feed document storage section and discharged document storage section), 24b...outer tray (feed document storage section and discharged document storage section), 32...document, 36a. 36b, 38a, 38b--Conveyance roller (document conveyance means), 40.44...Cleaning pad (document conveyance means) 42...Holding roller, 50...Control device (control means).

Claims (1)

[Claims] 1. A base having a document placement part, and a support base that is rotatably attached to an upright position and a down position with respect to the base, and has an optical system provided on its head. In the overhead projector, a fed document storage section and an ejected document storage section are provided in the support base, and a path from the fed document storage section to the document placement section and a path from the document placement section to the ejected document storage section. A document conveying means is provided in the passage, a holding roller rotatable in both forward and reverse directions is provided at the entrance of the document placement section, and the document is carried out from the feeding document storage section with the support base in the upright position. The document is conveyed onto the document placement section to a position where the terminal end thereof is in contact with the holding roller, and the document is conveyed from the document placement section to the ejected document storage section. 1. An overhead projector comprising: a control means for controlling driving of the holding roller and the holding roller.