JPH0331127A - Overhead projector - Google Patents

Abstract

PURPOSE:To automatically convey and clean a manuscript concurrently by providing a cleaning member cleaning the manuscript surface by the contact with it at the position in contact with manuscript conveying rollers, and pinching and conveying the manuscript between the cleaning member and the manuscript conveying rollers. CONSTITUTION:A manuscript is pinched and conveyed between conveying rollers 38a and 38b and a cleaning member 40. The surface of the manuscript is brought into contact with the cleaning member 40 and cleaned.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an overhead projector in which document conveyance is performed automatically.

[Conventional technology]

Conventionally, with overhead projectors, users had to manually place originals one by one on a document resting section such as a Fresnel lens, but this type of work was extremely difficult. In recent years, there has been progress in the development of devices that automatically transport the documents.

Specifically, as shown in Japanese Unexamined Patent Publication No. 123437/1983, a paper feed cassette and a collection cassette are provided below the document placement section, and the documents are transferred from the paper feed cassette to the document placement section above. After the document has been conveyed to the cassette below, the document is transported to a lower collection cassette, or a device such as an automatic document feeder (ADF) installed in a copying machine that feeds the document to one side of the document tray. A device is known in which a paper tray is provided and a paper output tray is provided on the other side.Here, the document is generally transported by rotation of a pair of transport rollers that are in pressure contact with each other. It has become.

[Problem to be solved by the invention]

There are many things that happen. Conventionally, users have manually cleaned the surface of each document one by one, but this work has become tedious.

SUMMARY OF THE INVENTION In view of the above circumstances, an object of the present invention is to provide an overhead projector that can automatically convey a document and clean the surface of the document at the same time.

[Means to solve the problem]

In an overhead projector equipped with an original transport roller, the present invention provides a cleaning member that cleans the surface of the original by contacting the original surface at a position in contact with the original transport roller, and the cleaning member is sandwiched between the cleaning member and the original transport roller. (Claim 1)
).

Further, the number of the document transport rollers is plural, and a first cleaning member is provided at a position where it contacts any of the document transport rollers, and the first cleaning member is in contact with another document transport roller, and the first cleaning member comes into contact with the document. It is more effective if the second cleaning member is provided at a position where it contacts the surface opposite to the surface to be cleaned (claim 2).
).

[For production]

First, according to the overhead projector according to the first aspect of the present invention, the document is conveyed while being sandwiched between the conveyance roller and the cleaning member, so that the surface of the document comes into contact with the cleaning member and is cleaned.

Further, according to the overhead projector according to the second aspect, the first cleaning member cleans one side of the document, and the second cleaning member cleans the other side of the document.

〔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 about a horizontal shaft 14. That is, the support stand 12 has an upright position (use position) with respect to the base 10 as shown in FIG. 3, and a lowered position (storage position) as shown in FIG.

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. A recess with a large opening is formed on the upper surface of the base 10, and a Fresnel lens (original mounting section) 1 is placed inside the recess.
8 is disposed, and a reflection mirror (not shown) is disposed below this Fresnel lens 18.

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

Next, the document conveyance mechanism provided 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 a lid 25. At the bottom of these trays 24a and 24b, locking claws 26 as shown in FIG. 4 are provided, and as shown in FIGS. and a compression spring 30 that biases the presser plate 28 toward the locking pawl 26 so that the lower end of the document 32 is sandwiched between the locking pawl 26 and the presser plate 28. It has become.

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 are oval conveyance rollers 36a, 36b and circular conveyance roller 38a.
, 38b are provided. Roughly speaking, as a feature of this overhead projector, each conveyance roller 38a, 3
A cleaning pad (first cleaning member) 40 is provided at a position in contact with the cleaning pad 8b. The cleaning pad 40 is made of a relatively soft material such as cloth or sponge, and has the function of cleaning the surface of the original 32 by coming into contact with it.

On the other hand, a holding roller 42 extending in the width direction (depth direction in FIG. 1) of the Fresnel lens 18 disposed on the base 10 is connected to the support roller 42 via a bracket 43 (FIG. 3). It is attached to the 12 side. And base 10
A cleaning pad (second cleaning member) 44 is also provided at a position in contact with this holding roller 42 on the side. This cleaning pad 44 is located below the holding row 542, and the cleaning pad 44 is located below the holding row 542.
It is arranged so that it contacts the surface opposite to the surface it contacts.

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 FIG. 7.8.
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.

Furthermore, 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 conveyance roller 36a based on detection signals from the sensors 51 and 52 and input signals from operation buttons 54 arranged at appropriate positions on the main body.

36b, 38a, 38b, holding roller 42, and switching solenoid 48 are controlled.

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

First, open the lid 25 above each tray (double-dashed line in Figure 1) and set the original in the inner tray 24a.In this overhead projector, the inner tray 24a and the outer tray 24b are used as the original feed tray and the original output tray. Although it is configured to alternately serve as a paper tray, a case will be described here in which the inner tray 24a is used as a document feed tray and the outer tray 24b is used as a document discharge tray.

As shown in FIG. 5, the specific method of setting the above-mentioned set is to rotate the presser plate 28 by operating the lever 34 protruding from the presser plate 28 of the inner tray 24a. A gap is created between the locking claw 26 and the locking claw 26. After inserting the lower end of the original 32 into this gap, by releasing the lever 34, the elastic force of the compression spring 30 moves the lower end of the original 32 between the presser plate 28 and the locking claw 26. It becomes a state where it is sandwiched between. At this time, the original 32 is set so that its front surface 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 document 32 is carried out to a position where the trailing edge of the document 32 contacts the holding roller 42 on the Fresnel lens 18 . Then, when the projection of this original 32 is completed, the operation button 54 is pressed again.
is operated, the document 32 is transferred to the outer tray 2.
4b and the next document 32 is transferred to the inner tray 24a.
It will be carried out.

The operation at this time will be explained with reference to the time chart of FIG. 10. First, when the projection of the document 320 onto the Fresnel lens 18 is completed, the operation button 54 is operated (point A in FIG. 10), and a control signal is output from the control device 50 to the holding roller 42 and the switching solenoid 48. , the holding roller 42 is rotated clockwise (
At the same time, the position of the passage switching pawl 46 is changed to the position shown in FIG. 6, that is, the position that forms the passage from the holding roller 42 to the outer tray 24b. At this time, the document 32 is collected into the support stand 12 while being sandwiched between the holding roller 42 and the cleaning pad 44, and its lower surface (back surface) comes into contact with the cleaning pad 44 and is automatically cleaned. .

Thereafter, the conveyance roller 38b is rotationally driven to start carrying the document 32 into the outer tray 24b. At this time, the front (down) side of the original 32 (
(right side in FIG. 6), that is, the cleaning pad 44
Since the surface opposite to the surface that was in contact with the cleaning pad 40 contacts the cleaning pad 40, this surface is also automatically cleaned, and as a result, both sides of the carried-in document 32 are cleaned.

Note that if the document detection sensor 52 does not detect a document at the time when the operation button 54 is operated, it is determined that there is no document on the Fresnel lens 18, and 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). At this time as well, the surface (right side in FIG. 6) of the transported document 32 comes into contact with the cleaning pad 401 and is cleaned.

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. Holding roller 42
By rotating in the opposite direction to the above (towards the left in the figure),
The preparation for feeding the original 32 onto the Fresnel lens 18 begins. Thereafter, when the conveyed original 32 actually passes through this holding roller 42, the lower surface (back surface) of the original 32 comes into contact with the cleaning pad 40 and is cleaned, and as a result, both surfaces of the original 32 are cleaned.

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 the entire stock document together with the presser plate 28 with the document 32 carried in sandwiched therebetween as shown in FIG. By pushing down against the elastic force of the compression spring 30, the final conveyance of the document 32 is started. Then, this conveyance roller 3
6b is rotated half a turn, the presser plate 28 is released, and the document 32 that has been transported 2 is held between the presser plate 28 and the locking claw 26 together with other documents. At this point, the rotation of the transport roller 38b is also stopped, and the transport 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.

As mentioned above, with this overhead projector,
Each conveyance roller 38a, 38b and cleaning pad 40
By conveying the document while being sandwiched between the holding roller 42 and the cleaning pad 44, the necessary document can be automatically supplied onto the Fresnel lens 18 and recovered. Moreover, during this conveyance, each of the cleaning pads 40.degree. 44 comes into contact with the document 32, so that the surface 3 of the document 32 is automatically cleaned, thereby eliminating the need for manual cleaning by the user as in the prior art. Further, since each cleaning pad 40, 44 has both the functions of transporting the document and cleaning the document, the cost is not increased compared to the conventional overhead projector provided with a pair of transport rollers.

Furthermore, like the overhead projector shown in this embodiment, a cleaning pad 40, which is a first cleaning member, is in contact with one surface of the document 32, and a second cleaning pad 40 is in contact with the other surface of the document 32.
By making contact with the cleaning pad 44, which is a cleaning member, it is possible to clean both sides of the document 32 at once.

In the above embodiment, an overhead projector is shown that performs both document supply and document collection, but the present invention can also be applied to a device that performs only one of these functions. Further, the present invention is not limited to the folding type as described above, and any overhead projector having a function of automatically conveying a document can be applied. in this case,
If the cleaning member is provided at a position in contact with the front side of the document in the document collection path, there is an advantage that hand marks and ink from writing that adhere to the document during use can be removed from the document immediately after use.

Further, in the present invention, the shape and structure of the conveyance rollers (conveyance rollers 38a and 38b in the above embodiment) with which the cleaning member comes into contact are not limited. It may also be one using a roller. However, by using a long roller extending in the axial direction, the document and the cleaning member can be brought into uniform contact in the width direction, and the cleaning effect can be further enhanced.

Further, in the present invention, the cleaning member may be made of any material or structure, as long as it is soft enough not to damage the surface of the document and has a function of cleaning the surface. The roller with which this cleaning member comes into contact may also be selected appropriately depending on the structure.

〔Effect of the invention〕

As described above, in the present invention, the cleaning member is brought into contact with the document conveyance roller, and the document is conveyed while being sandwiched between the rollers. Therefore, the document can be conveyed and cleaned simultaneously with a simple structure and automatically. There are effects that can be done. This eliminates the need for manual cleaning by the user, further improving work efficiency.

Furthermore, according to a device in which a first cleaning member is provided at a position in contact with one side of the document and a second cleaning member is provided on the other side, both sides of the document are cleaned at once while the document is being transported. There is an effect that can be done.

[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 input of the control device provided in the overhead projector. FIG. 10, a block diagram showing the output, is a time chart of control signals output by the control device. 6 32-...Manuscript, 36a, 36b, 38a, 38b...
- Conveyance roller (document conveyance roller), 4o...Cleaning pad (first cleaning member), 42...Holding roller (document conveyance roller), 44...Cleaning pad (
second cleaning member).

Claims (1)

[Claims] 1. In an overhead projector equipped with a document transport roller, a cleaning member that cleans the surface of the document by contacting with the surface of the document is provided at a position in contact with the document transport roller, and this cleaning member and the document transport roller An overhead projector characterized in that a document is conveyed while being sandwiched between the two. 2. The overhead projector according to claim 1, comprising a plurality of document conveyance rollers, and a first cleaning member provided at a position where it contacts any document conveyance roller, and which contacts the other document conveyance rollers and cleans the document. An overhead projector characterized in that a second cleaning member is provided at a position in contact with a surface opposite to the surface with which the first cleaning member contacts.