JPH05139556A - Projected document carrying device - Google Patents

Abstract

PURPOSE:To enable storage of many documents in a document cassette by reducing the thickness per document of a storing part, and reduce the required space of a carrying passage by reducing the thickness of a carrying mechanism. CONSTITUTION:Out of a plurality of documents stored in a document cassette 5, the desired document located on the document taking-out position is pushed out by means of a pushing mechanism 8. The pushed-out document is carried to the document setting position by means of a carrying mechanism 10, and returned to the document cassette 5 by means of the carrying mechanism 10 after projecting. Reduction in the thickness of the device can be realized by making separation between the pushing-out mechanism 8 and the carrying mechanism 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection document feeder for a projector for arbitrarily selecting a plurality of documents stored in a document cassette and feeding them to a document setting position of an optical projection means.

[0002]

2. Description of the Related Art Conventionally, there are many known mechanisms for taking out projected originals stored in a shelf-shaped original cassette. For example, the one disclosed in Japanese Utility Model Laid-Open No. 62-129539 is designed to take out an original using a magnet. Further, the one disclosed in Japanese Utility Model Laid-Open No. 52-27725 has a plurality of arms for taking out and storing a document. However, in this case, the originals can be taken out only in the order in which they are stored on the shelves. In addition, the actual exploitation 63-10
The one disclosed in Japanese Patent No. 1935 has a structure in which one end of the original is grasped in order to take out the original, and therefore, the thickness (height) of the original containing portion per one sheet becomes large.

On the other hand, when the original taken out from the cassette is conveyed to the projection unit, generally, as shown in FIG. 5, the original 35 is conveyed by being sandwiched between the rollers 36 and 37. In this case, one of the rollers is a driving roller and the other is a driven roller. This is to prevent the document from skewing or falling off as the document moves, which ensures reliable and accurate conveyance. If the object to be conveyed is a heavy object, the necessary friction occurs between the lower roller and the upper roller, so it is possible to omit the upper roller. The upper roller is also required because the deviation from the conveyance path occurs due to vibration and pulsation during conveyance. However, if the rollers are arranged above and below so as to sandwich the original, there is a problem that a large space is required in the vertical direction of the original conveying path.

[0004]

SUMMARY OF THE INVENTION According to the present invention, as in the case of the above-mentioned conventional example, the document storing portion per one sheet in the document cassette becomes thick, so that the number of documents that can be stored is reduced or the document is conveyed. The present invention is intended to solve the problem that a large space is required as a conveyance path because two rollers are used, and an object thereof is to provide a projection document conveying apparatus configured to be thin and compact. ..

[0005]

In order to achieve the above object, the present invention is as follows. (1) A pushing mechanism for pushing a document placed at a document take-out position from a document cassette, and a set document pushed out. And a transport mechanism for transporting the projected document from the document setting position to the document cassette.

Further, (2) a roller supporting the lower surface of the original and rotating with the movement of the original is provided, and the portion of the original that is in contact with the roller is made of a magnetic material or a magnetic material adhered. The north pole and the south pole are alternately magnetized in the direction.

[0007]

According to the above construction (1), if the rear end of the document is pushed out by the thin push-out member provided in the push-out mechanism, the thickness of the storage portion for each document can be reduced. , Many originals can be stored in the original cassette,
Further, if the claws are engaged with the concave portions provided on both side surfaces of the frame of the pushed-out document to pull it, the conveying mechanism can be made thin.

According to the configuration of (2), the magnetic material of the portion of the document that contacts the roller and the N pole and the S pole formed on the peripheral surface of the roller attract each other and are exactly sandwiched between the two rollers. Since the document is bound by, the document will not skew or fall off. Further, since the number of rollers is only one, it is possible to make the document conveying path thin.

[0009]

Embodiments will be described in detail below with reference to the drawings. FIG. 1 shows a projector 1 equipped with a projected original conveying apparatus according to an embodiment of the present invention, which includes an optical projection means including a projection lamp 2, a Fresnel lens 3, a projection lens (not shown), a mirror and the like. I have it. A contact glass 4 is arranged above the Fresnel lens 3. Reference numeral 5 denotes a document cassette in which a plurality of projection documents 6 are stored in a horizontal state, and an elevating device 7 is provided to position a desired document at a take-out position. Reference numeral 8 denotes an extruding mechanism for extruding the document 6 positioned at the take-out position from the cassette, and a rod-shaped extruding member 9 is inserted through a hole formed on the back surface of the cassette to push the rear end of the document. Reference numeral 10 denotes a transport mechanism that holds one end of the pushed document and transports it to the document setting position of the optical projection means, and also returns the projected document to the cassette.

FIG. 2 shows the structure of the document holding section of the transport mechanism 10. The projection original 6 is attached to a frame 11, and recesses 12 are formed on both side surfaces at one end of the frame. The document holding portion 15 is provided with a claw 16 that engages with the recess 12 of the document frame 11. The claw member 17 having the claw 16 formed at one end is
It is possible to rotate around an axis provided in its approximate center,
The pawl 16 is always urged by a spring member (not shown) so as to always face in the arrow X direction. A pin 18 is provided at the other end of the claw member 17 and is in contact with an edge portion of a lever 19 which is slidable in the Y and Y'directions. An inclined portion 20 is provided at the edge of the lever 19, and therefore, when the lever 19 is slid in the Y direction,
The pawl member 17 is moved so that the pin 18 rides on the inclined portion 20 and the pawls 16 open each other. Further, a pin 21 is planted in the lever 19 and is engaged with a long hole 23 provided obliquely in a plate cam 22 movable in the arrow Z direction.

Next, the operation of this embodiment will be described. When performing projection, if a desired document is selected by a document selection means (not shown), the elevating device 7 operates and the document cassette 5 moves, so that the desired document 6 is located at the document take-out position. Then, the pushing member 9 of the pushing mechanism 8 pushes the rear end of the document, and the document 6 is pushed out.

When the document 6 is pushed out, both sides of the leading end of the frame 11 open the claws 16 of the document holding section 15 of the transport mechanism 10, and when the document 6 reaches a predetermined depth, the claws 16 are recessed on both side surfaces of the frame 11. Engage with. Then, the transport mechanism 10 moves to set the document 6 at the document setting position of the projection unit.

The set original is projected on a screen (not shown) when the projection lamp 2 is turned on. When the projection is completed, the transport mechanism 10 returns to the initial position and inserts the original 6 into the cassette 5. Then, when the lever 19 is moved in the arrow Y direction, the claw 16 is detached from the concave portion 12 of the document frame 11, and at the same time, the plate cam 22 moves in the Z direction and pushes the front end of the document frame 11, so that the document 6 is It is completely stored in the document cassette 5.

In the present embodiment configured as described above, since the rear end of the original is pushed by the thin push-out member 9 in order to take out the original 6 from the cassette 5, the thickness of the storage portion per original is increased. Therefore, a large number of originals can be stored in the original cassette 5. Further, since the transport mechanism for transporting the pushed original document to the projection unit is also configured to pull by engaging the claws 16 with the concave portions 12 provided on both side surfaces of the original frame 11, this can also be formed thin.
The space between the Fresnel lens and the contact glass can be reduced.

FIG. 3 shows another embodiment of the present invention, in which parts having the same names as those in FIG. 1 are designated by the same reference numerals.
Here, the document feeder is provided with a roller 30 that supports the lower surface of the document when the document is transported from the document cassette 5 to the document setting position of the projection unit and rotates with the movement of the document.

FIG. 4 shows the details of the original 6 and the roller 30. The portion of the original 6 in contact with the roller 30 (frame portion) is made of a magnetic material, or a magnetic material is attached. It is composed. On the other hand, the roller 30 has a north pole and a south pole in the circumferential direction.
The poles are alternately magnetized, and the number of magnetized poles is determined by the size, weight, conveyance speed, etc. of the document frame.

Next, the operation of this embodiment will be described. roller
The original 6 provided with the magnetic material and conveyed on the 30 is attracted to the roller by the magnetic force lines 31 emitted from the roller 30. When the roller 30 is used as a driving roller, the attraction force between the roller and the original is equal to the frictional force between the normal transport roller and the transported object, or the nip force between the two rollers. Thereby, the transportation is performed. When the roller 30 is used as a driven roller, the rolling friction resistance at the time of conveyance increases, but by comparison with that, the lower roller 30 alone does not cause misalignment or meandering of the document at the time of conveyance, and it is accurate. The merit of being transported is great.

In the present embodiment constructed as described above, since there is only one roller 30 that supports the lower side of the original as a conveying roller, the space between the Fresnel lens 3 and the contact glass 4 should be narrowed. Therefore, the overall thickness can be reduced.

In general, it is widely practiced to project two originals in an overlapping manner. In this case, an original set between the Fresnel lens 3 and the contact glass 4 and an original placed on the contact glass 4 are projected. Although two sheets are projected in an overlapping manner, in the conventional configuration in which two originals are conveyed by the two conveying rollers, the two originals are too far apart and are located outside the depth of field of the projection lens, resulting in a clear image. I can't get it. It is conceivable to project the upper roller to the side of the contact glass to reduce the distance between the originals, but this is not preferable in terms of appearance and is not realistic due to various restrictions.

By narrowing the space between the Fresnel lens 3 and the contact glass 4 as in this embodiment, it is possible to clearly project even when two originals are stacked.

[0021]

As described above, according to the present invention,
(1) Since the thickness of the storage section for each original can be reduced, a large number of originals can be stored in the original cassette. Further, the transport mechanism for transporting the document between the document cassette and the document setting position of the projection unit can also be made thin, and thinning and compactness can be realized as a whole.

(2) Since the transport roller is composed of only one roller that supports the lower surface of the original and magnetically attracts it, the transport path can be made thinner and the transport path is accurate and reliable. Further, even when two originals are superposed, a clear projection can be achieved.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a projector including a document feeder according to an embodiment of the present invention.

FIG. 2 is a perspective view of a document holding portion of the transport mechanism in the embodiment.

FIG. 3 is a cross-sectional view of a projector including a document feeder according to another embodiment of the present invention.

FIG. 4 is a detailed configuration diagram of a document and rollers of the embodiment.

FIG. 5 is a diagram showing a conventional transport roller.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Projector, 2 ... Projection lamp, 3 ... Fresnel lens, 4 ... Contact lens, 5 ... Original cassette, 6 ... Original, 8 ... Extrusion mechanism, 10 ... Conveying mechanism, 30 ... Roller.

Claims (2)

[Claims] 1. A conveyance device for arbitrarily selecting and taking out a plurality of framed projection originals stored horizontally in an original cassette and conveying them to an original setting position of an optical projection means, which is set at an original extraction position. Projection characterized by comprising a push-out mechanism that pushes out the positioned document from the document cassette, and a transport mechanism that transports the pushed document to the document set position and transports the projected document from the document set position to the document cassette. Document feeder. 2. A transport device for transporting a projected document from a document cassette to a document setting position of an optical projection means, comprising a roller that supports the lower surface of the document and rotates with the movement of the document, and is in contact with the roller of the document. The part is made of a magnetic material or a magnetic material adhered, and the roller is circumferentially N-shaped.
A projected original transporting device, wherein poles and S poles are alternately magnetized.