JPH07146514A - Projecting device - Google Patents

Abstract

PURPOSE:To prevent an image projected on a screen in the midst of feeding an original from getting unseemly and to improve a presentation effect by turning off a light source in the midst of feeding the original in a device irradiating an original image with light and projecting it. CONSTITUTION:A one chip microcomputer(MCOM) 36 principally controls feeding the original. Respective signals are inputted in the MCOM 36 by a remote control reception part 21 and a film mark sensor 15 detecting a film end mark, and the MCOM 36 outputs a signal for turning on/off a motor 22 and a lamp 106. When the advance button of a remote controller is depressed, the motor 22 is rotated and stopped after the original is fed by a specified amount until it is placed on a platen glass. After a counter in the MCOM 36 counts that a specified time elapses until feeding the original by inertia is perfectly stopped, the lamp 106 is turned on. When the remote controller is operated to project the next original, the lamp 106 is turned off first and the motor 22 is rotated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a projection device such as an overhead projector (OHP) for irradiating an original image with light from an exposure section and projecting it onto a screen.

[0002]

2. Description of the Related Art An overhead projector (OHP) device equipped with a conventional document feeder will be described with reference to FIG. The OHP device 201 is a device for projecting an image onto a screen (not shown) by irradiating an original conveyed on a platen glass 202 by an original conveying device described later with light from an exposure section. The document transporting device holds a document by sandwiching it with a transport film 51 and a pressing film 52, and these are long and made of a transparent film wider than the width of the document.

A document is placed on the transport film 51, and the document is transported as the transport film 51 is wound up. On the other hand, the pressing film 52 presses the upper surface of the original on the conveying film 51 to prevent the original from curling and prevent the original from being damaged.

Further, frame marks (not shown) are provided at predetermined intervals at the widthwise end of the transport film 51. By detecting this frame mark by the frame detection sensor 53, a desired document is conveyed and set on the exposure section.

The first winding means 54 winds one end of the long transport film 51 and the pressing film 52, and as shown in FIG. 10, it is located outside the reading area (platen glass) of the exposure unit of the OHP device 201. A first transport roll 54a that winds the transport film 51 and a first press roll 54b that winds the press film 52 are rotatably attached between the front and rear frames and are arranged on the right side (outside 202). The positional relationship between the first transport roll 54a and the first pressing roll 54b is such that the first transport roll 54a is on the lower side, as shown in FIG.
The first pressing roll 54b is arranged so that it is on the upper side.

The second winding means 55 is for winding the other ends of the long conveying film 51 and the pressing film 52, and as shown in FIG. 10, outside the reading area (platen glass) of the exposure section of the OHP device 201. A second transport roll 55a that winds the transport film 51 between the front and rear frames and a second press roll 55b that winds the pressing film 52 are rotatably attached between the front and rear frames.

The stretching means is a transport film with a document sandwiched between them.
The pressing film 52 and the pressing film 52 are stretched so as to be closely attached to each other on the platen glass 202 of the OHP device 201, and the right roller pair 56a, 56b is provided on the right side outside the reading area of the exposure section.
And a left roller 56c is provided on the left side outside the reading area. Further, as shown in FIG. 10, the transport film 51 and the pressing film 52 pass above the lower right roller 56a and below the left roller 56c, so that the platen glass 20
2 It is designed to be stretched tightly on top. Further, the upper right roller 56b is also rotatably attached to the front and rear frames in the same manner, and the lower right roller is provided by a spring (not shown).
It is biased to 56a. By passing the transport film 51 and the pressing film 52 between the right roller pair 56a, 56b, the two films 51, 52 are brought into close contact with each other.

Further, a remote control receiver is provided on the operation panel 57 of the document feeder, and the remote controller (remote controller) (not shown) can be used to remotely control the driving instructions of the left and right motors (not shown).

As shown in FIG. 10, a feed tray 58a for feeding a document and a movable tray 58b are attached near the first winding means 54, respectively, and the movable tray 58b is swung by the swing of the upper right roller 56b. Are configured to be evacuated. Further, the supply tray 58a is provided with a document detection sensor (not shown) for detecting the presence or absence of a document, and a reflection type sensor is used as the document detection sensor.

As shown in FIG. 10, the right roller pair 56a,
A frame detection sensor 53 is provided between 56b and the first transport roll 54a so as to sandwich the transport film 51. A transmissive sensor is used for this frame detection sensor 53,
A coma mark for blocking light, which is provided at the end portion of the width direction of 51, is detected.

Further, 59a and 59b are document guides, which are fixed to front and rear side plates (not shown), and the purpose thereof is the first transport roll 54a or the second transport roll.
When the document wound around 55a is sent out, the document is guided between the transport film 51 and the pressing film 52, and when the document is wound around the first transport roll 54a or the second transport roll 55a together with the transport film 51, the document is transported to the first roll. The guide is provided to smoothly wind the first transport roll 54a and the second transport roll 55a without collision.

[0012]

However, in the conventional OHP apparatus 201, since the platen glass 202 is exposed by the exposure unit and the image is projected on the screen even during the document transportation by the document transportation apparatus, There was a problem described in.

(1) The space between the originals is dazzling because the light is directly projected on the screen through the transparent conveying film 51 and the pressing film 52.

(2) When exchanging a document, the transport film 51 and the pressing film 52 holding the document are wound up, so that the scrolling document image is projected on the screen, so that the viewer can follow the projected image with his / her eyes. There is a risk that the eyes may become tired and discomfort may occur.

The present invention solves the above-mentioned problems of the prior art, and an object of the present invention is to eliminate the unpleasantness of the image projected on the screen during the transportation of the original document, thereby contributing to a more effective presentation. The present invention is to provide a projection device.

[0016]

A typical configuration according to the present invention for achieving the above object is a projection device for projecting a document image onto a screen by irradiating a document image with light from the exposure unit. A document transporting means for transporting the light source to the sheet, and a control means for controlling ON / OFF of the light source in the exposure section,
The control means controls the light source to be turned off while the document feeding means is feeding the document.

[0017]

According to the above construction, the control unit turns off the light source in the exposure section while the document transporting unit is transporting the document, so that the scrolling document image is projected on the screen or the light is directly projected on the screen. Can be prevented.

[0018]

【Example】

 [First Embodiment]

Next, an example of the document feeder of the present invention will be described with reference to the drawings. Figure 1 shows an OHP using a document feeder
FIG. 2 is an external view of the apparatus, and FIG. 2 is an OH equipped with a document feeder
FIG. 3 is an explanatory view of a cross-sectional structure of the apparatus P, FIG. 3 is an explanatory view of a drive system of the original conveying apparatus, FIG. 4 is an explanatory view of the configuration of a pickup roller of the original conveying apparatus, FIG.
FIG. 3 is a block diagram showing a control system of a P apparatus and a document feeder.

(Overall structure)

First, referring to FIG. 1, the overall structure of the OHP device B equipped with the document feeder A according to the present embodiment will be described. This is the OH shown in FIG.
It is mounted on the P-device B and automatically sends out the OHP original 1 used for the OHP device B. That is, between the conveying film 2 made of a long transparent film and the pressing film 3 made of a long transparent film, a manuscript 1 is made from a plurality of manuscript bundles one by one in a page order by a separating and conveying mechanism described later. Is conveyed and pinched, and both films 2 and 3 are conveyed by the film conveying means 4 so as to be in close contact with the exposure section 101 while holding the original 1 therebetween. The transport film 2 and the pressing film 3 are the second winding means 6
The first winding means 5 is driven to rotate so that both films 2 and 3 are wound. Manuscript 1 above
Is a platen glass sandwiched between the transport film 2 and the pressing film 3 and disposed in the exposure section 101 of the OHP device B.
102 is transported onto. The original 1 is irradiated with light from the exposure unit 101, and its transmitted light is projected on a screen (not shown) through a reflecting mirror 104 and a lens 105, which are projection means supported above by an arm 103,
It is configured to magnify and project the image described in the document.

(Structure of OHP device)

Next, the specific structure of the OHP device B will be described. In FIG. 2, 106 is a lamp which is a light source and is installed in the exposure section 101. In addition, a reflector 107, a lens 108, and a mirror 10 are provided near the lamp 106.
Each is equipped with 9. The light emitted from the lamp 106 is reflected by the reflection plate 107 or directly reflected by the lens 10
The light is diffused through the mirror 8, reflected by the mirror 109, and emitted toward the document on the platen glass 102. The platen glass 102 incorporates a Fresnel lens inside, and when the light diffused from the lamp 106 to the platen glass 102 passes through the platen glass 102, a reflection mirror 104
The light is focused so as to enter the lens 105 via. The light image that has passed through the lens 105 is enlarged and projected on a screen (not shown).

Next, the structure of each part of the document feeder A will be described in detail.

(Separation / Conveyance Mechanism)

In FIG. 2, 7 is a feeding tray,
This is a stack of documents. The document stack is placed on the feed tray 7 along the guide member 8 in the order of pages from the top with the image surface facing upward. 9 is a pickup roller,
The feeding roller 10 is pivotally supported by a swing arm 11 which is swingable around a feeding roller shaft 10a. When the feeding operation is started, the swing arm 11 rotates in the clockwise direction and presses the pickup roller 9 to the uppermost side of the original stack, so that the originals 1 are sequentially fed from the uppermost side. Feed roller 10 above
Is for feeding the document 1 supplied by the pickup roller 9 to the downstream side. Reference numeral 12 denotes a separation roller, which is pressed against the feeding roller 10 by a spring (not shown). The separating roller 12 has a built-in one-way clutch, and is driven by the side plate of the document conveying apparatus A only when the feeding roller 10 rotates counterclockwise around the separating roller shaft 12a having a rotation stop. Is configured. The document 1 is separated and conveyed one by one by a feeding roller 10 and a separating roller 12 which rotate in the same direction, and a feeding upper guide is provided.
The leading end is guided to the nip between the film transport roller pairs 4a and 4b by being guided by the lower guide 13a and the lower feed guide 13b. Reference numeral 14 is a feeding sensor for detecting the leading edge and the trailing edge of the document 1.

(Conveying film and pressing film)

The transport film 2 and the pressing film 3 hold the original 1 so as to sandwich it, and are made of a transparent film which is long and wider than the width of the original 1. It is preferable that the film is thin if the strength is maintained, and a film having a thickness of about 25 μm to 60 μm is preferably used. As a material, a material having good light transmittance and stable heat resistance is preferable, and for example, a polyethylene terephthalate film or the like is preferably used.

The original film 1 is placed on the transport film 2, and the original document 1 is transported as the transport film 2 is wound. On the other hand, the pressing film 3 presses the upper surface of the original 1 on the transport film 2 to move the original 1
Of the original 1
Is to prevent scratches.

A film end mark 2a is provided at the end of the transport film 2 at the widthwise end of the transport film 2, as shown in FIG. The transport operation of the original 1 is started with the position where the film end mark 2a is detected by the film mark sensor 15 as the home position of the transport film 2.

(Film transport section)

Both ends of the transport film 2 are fixed to the first transport roll 5a equipped in the first winding means 5 and the second transport roll 6a equipped in the second winding means 6, and the film transport roller is used. The pairs 4a and 4b and the tension roller 16 are in close contact with the pressing film 3. Further, the pressing film 3 has both ends fixed to a first pressing roll 5b equipped in the first winding means 5 and a second pressing roll 6b equipped in the second winding means 6, and similarly, a film conveying roller. The pair of films 4a and 4b and the tension roller 16 are in close contact with the transport film 2.

The film transport roller pairs 4a and 4b are
Film transport upper roller 4a and film transport lower roller 4b
Are in pressure contact with each other at a pressure of 1 kgf to 2 kgf, and control the transport of the transport film 2 and the pressing film 3, and
A pair of separating / conveying originals 1 is fed / separating roller pair 1
It is pulled out from 0 and 12 and sandwiched between the above-mentioned transport film 2 and the pressing film 3 and transported.

(First winding means)

The first winding means 5 is for winding one end of the long transport film 2 and the pressing film 3 and is arranged outside the reading area of the exposure section 101 of the OHP device B as shown in FIG. To be done. In the present embodiment, as shown in FIGS. 2 and 3, a first transport roll 5a, which is arranged on the left side outside the reading area of the exposure unit 101, around which the transport film 2 is wound, and a first pressure roll 5b around which the pressure film 3 is wound are provided. It is rotatably attached to the front and rear frames.

That is, as shown in FIG. 3, flanges 5a ₁ and 5a ₂ having side regulating portions for regulating the deviation of the conveying film 2 are fitted to the opening portions at both ends of the first conveying roll 5a with a slight pressure. The flanges 5a ₁ and 5a ₂ are rotatably fitted and attached to the first transport roll shaft 5c. The transport film 2 is fixed to the outer periphery of the first transport roll 5a with cellophane tape or the like, and the transport film 2 is wound by the rotation of the first transport roll 5a.

Further, flanges 5b ₁ and 5b ₂ having side regulating portions for regulating the deviation of the pressing film 3 are fitted to the opening portions on both ends of the first pressing roll 5b with a slight pressure, and the flanges 5b ₁ and 5b ₂ are fitted. Is rotatably fitted and attached to the first pressing roll shaft 5d. The pressing film 3 is fixed to the outer periphery of the first pressing roll 5b with cellophane tape or the like, and the pressing film 3 is wound by the rotation of the first pressing roll 5b.

(Second winding means)

The second winding means 6 winds the other ends of the long transport film 2 and the pressing film 3 and is arranged outside the reading area of the exposure section 101 of the OHP device B as shown in FIG. It is what is done. In this embodiment, as shown in FIGS. 2 and 3, the second transport roll 6 is arranged on the right side outside the reading area of the exposure section 101 and around which the transport film 2 is wound.
A and a second pressing roll 6b around which the pressing film 3 is wound are rotatably attached to the front and rear frames.

That is, as shown in FIG. 3, flanges 6a ₁ and 6a ₂ having side regulating portions for regulating the deviation of the conveying film 2 are fitted to the openings at both ends of the second conveying roll 6a with a slight pressure. The flanges 6a ₁ and 6a ₂ are rotatably fitted and attached to the second transport roll shaft 6c. The transport film 2 is fixed to the outer circumference of the second transport roll 6a with cellophane tape or the like, and the transport film 2 is wound by the rotation of the second transport roll 6a.

Further, flanges 6b ₁ and 6b ₂ having side regulating portions for regulating the deviation of the pressing film 3 are fitted to the opening portions of both ends of the second pressing roll 6b with a slight pressure, and the flanges 6b ₁ and 6b ₂ are fitted. Is rotatably fitted and attached to the second pressing roll shaft 6d. The pressing film 3 is fixed to the outer circumference of the second pressing roll 6b with cellophane tape or the like, and the pressing film 3 is wound by the rotation of the second pressing roll 6b.

(Stretching means)

The tension roller 16 and the film transport roller pair 4a, 4b are used to transport the transport film 2 holding the original 1 therebetween.
And the pressing film 3 on the OHP device B platen glass 10
It is to be stretched so that it is positioned closely on top of each other. In this embodiment, as shown in FIG. 2 and FIG.
A tension roller 16 is arranged on the left side of the reading area 1 and a film conveying roller pair 4a, 4b is arranged on the right side of the reading area.

The tension roller 16 is made of a hollow pipe material, and the flange 16 is provided at the opening at both ends.
a ₁ and 16 a ₂ are fitted with a light pressure, and the flanges 16 b ₁ and 16 a
The b ₂ are mounted rotatably engaged to the tension roller shaft 16b. Both ends of the tension roller shaft 16b are fixed to a flange or the like with screws or the like. Figure 2
As shown in FIG. 3, the pressing film 3 is wound around the outer circumference of the tension roller 16, and the transport film 2 is further wound around the outer circumference of the tension roller 16 so that they are in close contact with each other. By moving the transport film 2 and the pressing film 3 to the left and right, it is possible to prevent the tension roller 16 from being driven to rotate, thereby causing scratches and the like on the transport film 2 and the pressing film 3.

(Discharging means)

In FIG. 2, numeral 17 is a scooping mylar, and when the document 1 sandwiched between the transport film 2 and the pressing film 3 is transported to the right in the figure, the leading end of the document 1 is a film transport roller. When passing through the nip portion of the pair 4a, 4b, the leading edge of the document 1 is guided to the discharge path by the scooping mylar 17. The carrier film 2 and the pressing film 3
By further moving the document 1 to the right, the leading edge of the document 1 is detected by the discharge sensor 18, and the pair of discharge rollers 19 are driven to rotate to convey the document 1 and discharge it to the feed tray 7. The discharge roller pair 19 is a discharge roller 19a to which driving force is transmitted.
And a discharge roller 19b which is pressed against this by light pressure and rotates by rotation.

(Remote control)

In FIG. 2, reference numeral 20 denotes a remote controller, which has a forward button 20a and a backward button 20b. Reference numeral 21 denotes a remote control receiver which remotely controls the driving / stopping of the document feeder A in response to a signal transmitted from the remote controller 20.

(Drive system)

Next, the drive system of the document feeder A is shown in FIG.
Will be described with reference to. Reference numeral 22 denotes a motor, which is a drive source for driving the entire document feeder A, and is a stepping motor. The output shaft of this motor 22 is a pulley
22a is fixed. An endless timing belt 23 is wound around the pulley 22a. The pulley 24a is connected to an electromagnetic clutch 24 attached to one end of the feed roller shaft 10a, and is attached to one end of a rotation shaft of a discharge roller 19a. The pulley 19c and the pulley 4c attached to one end of the rotation shaft of the film transport upper roller 4a are respectively wound to transmit the driving force.

The feeding roller 10 and the pickup roller 9 are driven as follows. When the motor 22 is driven, the driving force is transmitted to the pulley 24a connected to the electromagnetic clutch 24 via the timing belt 23. At this time the electromagnetic clutch 24
When is turned on, the driving force is transmitted to the feeding roller shaft 10a, and the feeding roller 10 fixed to the feeding roller shaft 10a is rotationally driven. The feeding roller 10 has a separating roller 12 of 200 g to 30 g.
Pressed with a force of about 0 g. As described above, the one-way clutch is attached to the separating roller 12, and there is a rotation stopper for the side plate when the document 1 is fed, that is, when the feeding roller 10 rotates in the clockwise direction in FIG. Since the separation roller shaft 12a is difficult to form, the outer circumference of the separation roller 12 becomes a friction piece. When the original 1 is discharged, that is, the feeding roller
When 10 rotates counterclockwise in Fig. 2, the separation roller
Reference numeral 12 is rotated by being driven by the feeding roller 10 or the original document 1 located therebelow.

The coefficient of friction μ of the feeding roller 10 is set higher than the coefficient of friction μ of the separating roller 12, and a plurality of originals are fed by the feeding roller 10 and simultaneously separated by the separating roller 12. Since the brake is applied, only the uppermost original 1 is fed. Since this structure is a so-called known friction separating mechanism, detailed description thereof will be omitted.

Next, driving of the pickup roller 9 will be described with reference to FIGS. 3 and 4. In FIG. 3, the feeding roller shaft 10a has a pulley 10b and a pickup roller shaft 9
A pulley 9b is attached to each a, and an endless timing belt is provided between the pulley 10b and the pulley 9b.
There are 25 wrapped around. Therefore, when the feeding roller 10 rotates, the driving force is transmitted to the pickup roller 9 via the timing belt 25.

Further, as shown in FIG. 4, both ends of the pickup roller shaft 9a are fixed to swing arms 11a and 11b, and a pulley 9b is rotatably attached to the pickup roller shaft 9a. Convex portions for transmitting the rotational force are formed on both side surfaces of the pulley 9b and are engaged with the convex portions of the pickup roller cores 9c ₁ and 9c ₂ . Further, a compression spring 9d is fitted between the pickup roller core 9c ₁ and the pulley 9b, and friction pieces 9e ₁ and 9e
The pickup roller cores 9c ₁ and 9c ₂ are pressed against the swing arms 11a and 11b via e ₂ . Further, pickup roller rubbers 9f ₁ and 9f ₂ are attached to the outer circumferences of the pickup roller cores 9c ₁ and 9c ₂ , respectively.
It is to give a conveying force to the.

That is, when the feeding roller 10 rotates, the driving force is transmitted to the pulley 9b via the timing belt 25, and the rotational force is transmitted to the swing arm 11 via the friction pieces 9e ₁ and 9e _2.
It is transmitted to a and 11b. At this time, since the swing arms 11a and 11b are configured to be rotatable around the feeding roller shaft 10a,
The swing arms 11a and 11b rotate around the feed roller shaft 10a, and the pickup roller 9 itself swings. For example, at the time of feeding an original, the feeding roller 10 rotates in the clockwise direction in FIG. 2 and the rotation of the pickup roller 9 rotates in the clockwise direction via the timing belt 25. At the same time, the swinging arms 11a and 11b move. By the frictional force of the swing arm 11
The a and 11b rotate clockwise around the feeding roller shaft 10a and are placed on the document stack, and press the document stack. When the pickup roller 9 further rotates, a force for conveying the original 1 is obtained by the frictional force with the original 1.

Next, in FIG. 3, the rotation of the motor 22 is transmitted to the pulley 4c, and the pulley 4c is fixed to the upper film conveying roller 4a.
a rotates. Since the film transport lower roller 4b is pressed by the film transport upper roller 4a, the rotational force of the film transport upper roller 4a is transmitted to the film transport lower roller 4b via the transport film 2 and the pressing film 3 and is driven to rotate. .

In FIG. 3, the rotation of the motor 22 is transmitted to the pulley 19c via the timing belt 23, and the pulley 19c is fixed to one end of the rotating shaft of the discharging roller 19a, so that the discharging roller 19a rotates. . Also discharge roller 19b
Is pressed by the discharge roller 19a, and the discharge roller pair
A conveying force for conveying the document 1 conveyed to 19 can be obtained.

In addition to the pulley 4c, two pulleys 4d and 4e are attached to the rotary shaft of the above-mentioned film conveying roller 4a, and these pulleys 4d and 4e have a built-in one-way clutch. An endless timing belt 26 is wound around the outer circumference of the pulley 4d, and the timing belt 26 is attached to one end of the first transport roll shaft 5c and the pulley 5e and the first pressing roll shaft 5d.
Is wound around a pulley 5f fixed to one end of the.

A gear 5g is provided on the first pressing roll shaft 5d.
Is fixed, and the gear 5g meshes with the one-way gear 27. The one-way gear 27 is attached to a caulking shaft 28 fixed to a frame, and is assembled so that the one-way gear 27 locks with the caulking shaft 28 when the gear 5g rotates counterclockwise in FIG.

A torque limiter 29 is attached to the first pressing roll shaft 5d as shown in FIG. 3, and the pulley 5f is rotated by the flange 5b ₁ from the first pressing roll shaft 5d via the torque limiter 29. And the first pressing roll 5b, which is pressed into the outer periphery of the pressing roller 5b, rotates to wind the pressing film 3.

On the other hand, a torque limiter 30 is attached to the first transport roll shaft 5c as shown in FIG. 3, and the rotation of the pulley 5e is rotated from the first transport roll shaft 5c via the torque limiter 30 to the flange 5a _1. And the first transport roll 5a, which is pressed into the outer periphery of the transport roll, rotates to wind up the transport film 2.

An endless timing belt 31 is wound around the outer circumference of the pulley 4e. The timing belt 31 includes a pulley 6e fixed to one end of the second conveying roll shaft 6c and a second pressing roll shaft 6d. It is wound around a pulley 6f fixed at one end.

A gear 6g is fixed to the second transport roll shaft 6c, and the gear 6g meshes with the one-way gear 32. The one-way gear 32 is attached to the caulking shaft 33 fixed to the frame, and the gear 6g is shown in FIG.
The one-way gear 32 is assembled so as to lock with the caulking shaft 33 when rotated in the clockwise direction.

Further, as shown in FIG.
As shown in, the torque limiter 34 is attached,
Rotation of the pulley 6e is transmitted to the flange 6a ₁ via the torque limiter 34 from the second transport roll shaft 6c, and rotates the second conveying rolls 6a which is press-fitted on the outer periphery thereof, winding the conveying film 2.

On the other hand, as shown in FIG.
As shown in, the torque limiter 35 is attached,
Rotation of the pulley 6f is transmitted to the flange 6b ₁ via the torque limiter 35 from the second pressing roll shaft 6d, the second pressing roll 6b being press-fitted into an outer periphery thereof to wind the film 3 presser to rotate.

(Film transport operation)

First, the transport operation of the transport film 2 and the pressing film 3 when transporting the original 1 from the feeding tray 7 onto the platen glass 102 will be described. In FIG. 3, when the motor 22 is driven in the clockwise direction, the driving force is transmitted to the pulley 4c via the timing belt 23, and the pulley 4c is fixed to the film conveying upper roller 4a. Rotates clockwise. Since the film-conveying lower roller 4b is pressed against the film-conveying upper roller 4a, the film-conveying roller pair 4 nips and advances the original 1.

When the film transport upper roller 4a rotates in the clockwise direction, the one-way clutch in the pulley 4d locks and rotates, and the pulleys 5f and 5e rotate via the timing belt 26. The pulleys 4d, 5f, 5e
The number of teeth in the case of the speed of the pressing film 3 and the conveying film 2 wound around the first pressing roll 5b and the first conveying roll 5a is higher than the conveying speed of the pressing film 3 and the conveying film 2 in the film conveying roller pair 4, respectively. The torque limiter 2 is set to be even faster.
The original 1 on the platen glass 102 is conveyed without wrinkles because the pressing film 3 and the conveying film 2 are pulled via the 9 and 30, respectively. Further, when the film transport upper roller 4a rotates in the clockwise direction, the pulley 4e is configured to rotate freely without the one-way clutch locking.

By rotating the first pressing roll 5b and the first conveying roll 5a, the pressing film 3 and the conveying film 2 are conveyed to the left in FIG. At this time,
The second pressing roll 6b and the second conveying roll 6a rotate in the clockwise direction, respectively, but the one-way gear 32 meshed with the gear 6g fixed to the second conveying roll shaft 6c is the caulking shaft 33.
The second transport roll shaft 6c is fixed so as to be locked. At this time, the second transport roll shaft 6c and the flange 6a
₁ causes the torque limiter 34 to slip. As a result, back tension is applied to the transport film 2 and the transport film 2 can be transported without wrinkling.

As described above, the second conveyor roll shaft 6
Since c is fixed, the pulley 6e fixed to the second transport roll shaft 6c is also fixed, and the timing belt 31 wound around the outer periphery thereof is also fixed.
Also fix f. Since the pulley 6f is fixed to the second pressing roll shaft 6d, the second pressing roll shaft 6d and the flange 6b ₁ cause the torque limiter 35 to slip. As a result, back tension is applied to the pressing film 3 so that the pressing film 3 does not have wrinkles.
Can be transported.

Next, the transport operation of the transport film 2 and the pressing film 3 when transporting the document 1 from the platen glass 102 onto the feed tray 7 will be described. In FIG. 3, when the motor 22 is driven in the counterclockwise direction, the film transport upper roller 4a rotates in the counterclockwise direction, and the one-way clutch in the pulley 4e locks and rotates. 6f, 6
e rotates. The number of teeth of the pulleys 4e, 6f, 6e is such that the speed of the pressing film 3 and the conveying film 2 wound around the second pressing roll 6b and the second conveying roll 6a is the pressing film 3 and the conveying film 2 in the film conveying roller pair 4, respectively. It is set to be faster than the conveying speed of the original in any case. Further, since the pressing film 3 and the conveying film 2 are pulled respectively via the torque limiters 34 and 35, the original 1 on the platen glass 102 is conveyed without wrinkles. It Further, when the film transport upper roller 4a rotates counterclockwise, the pulley 4d is configured to rotate freely without the one-way clutch locking.

By rotating the second pressing roll 6b and the second conveying roll 6a, the pressing film 3 and the conveying film 2 are conveyed rightward in FIG. At this time,
The first pressing roll 5b and the first transporting roll 5a rotate counterclockwise, respectively, but the one-way gear 27 meshed with the gear 5g fixed to the first pressing roll shaft 5d locks the caulking shaft 27 so that The first pressing roll shaft 5d is fixed. At this time, the first pressing roll shaft 5d and the flange 5b ₁ causes a slip in the torque limiter 29. As a result, back tension is applied to the pressing film 3 and the pressing film 3 can be conveyed without wrinkling.

As described above, since the first pressing roll shaft 5d is fixed, the first pressing roll shaft 5d is fixed.
The pulley 5f fixed to the above is also fixed, and since the timing belt 26 wound around the outer periphery thereof is also fixed, the pulley 5e is also fixed. The pulley 5e is the first transport roll shaft 5c.
The first transport roll shaft 5c and the flange 5a ₁ slip due to the torque limiter 30 because they are firmly fixed to each other. As a result, back tension is applied to the transport film 2 and the transport film 2 can be transported without wrinkling.

(Structure of control unit)

Next, the document feeder A and the document feeder A
The control unit of the OHP device B equipped with will be described with reference to the block diagram shown in FIG. In FIG. 6, the control operation of the document feeder A is performed by a well-known one-chip microcomputer (hereinafter referred to as "MCOM") having a built-in ROM, RAM and the like.
Say) 36 is mainly performed. At the input ports P _{0 to} P ₃ of the MCOM 36, a remote control receiver 21 for receiving a signal from the remote controller 20 described above, a film mark sensor 15 for detecting the film end mark 2a on the transport film 2, a fed document. Each signal is input from the discharge sensor 18 or the like which detects 1.

The output ports F ₀ to F of the MCOM 36 are also
Reference numeral ₂ denotes an ON / OFF operation of a motor 22, which is a drive source for driving each roller required to convey the original document 1, the transport film 2 and the pressing film 3, and the fed original document 1
Output signal for performing ON / OFF operation of the electromagnetic clutch 24 that controls the interval of the, and ON / OF of the lamp 106 of the OHP device B
An output signal for performing the F operation is output.

The reading of the input signals, the ON / OFF operation of the load, etc. are executed according to the program stored in the ROM in the MCOM 36.

(Mechanism for setting home position of transport film)

In FIG. 2, a photo sensor is used as the film mark sensor 15, and the film mark sensor 15 is fixed to the frame. The film mark sensor 15 is arranged at a position corresponding to the end of the transport film 2. When the film end mark 2a written on the transport film 2 is transported, the film end mark 2a is a light-shielding mark. It is detected because it exists. Therefore, the film edge mark 2a is arranged at the leading edge of the transport film 2 that can be conveyed, and the home position is set in accordance with the position of the film edge mark 2a after the power is turned on.

(Document transport operation)

Next, the document conveying operation by the document conveying device A will be described with reference to FIG. First, the original stack is placed on the feeding tray 7 and the leading end is abutted against the separation roller 12. When the forward button 20a is pressed using the remote controller 20, the motor 22 rotates in the clockwise direction to rotate the film transport upper roller 4a in the same direction to transport the transport film 2 and the pressing film 3 to the left in FIG. To do. Then, the first transport roll 5a and the first pressing roll 5b are rotated while slipping at high speed to wind up the transport film 2 and the pressing film 3.

Next, the electromagnetic clutch 24 is operated to rotate the feeding roller 10 in the clockwise direction. At the same time, the pick-up roller 9 also rotates clockwise while the swing arm 11
Is rotated in the clockwise direction around the feeding roller shaft 10a, the pickup roller 9 is placed on the document stack, and further pressed. At this time, the feed roller 10 and the separation roller
Sequentially fed into 12 nip parts. The friction coefficient μ between the feeding roller 10 and the original (OHP sheet) 1 is determined by the separation roller.
Since it is set to be larger than the friction coefficient μ between 12 and the original 1, even if two originals 1 enter the nip portion, only the upper original 1 is conveyed.

Next, when the leading edge of the separated and conveyed original 1 is detected by the feeding sensor 14, the original 1 is nipped by the film conveying roller pair 4. After that, the original 1 is fed to the transport film 2
After being sandwiched between the pressing film 3 and conveyed by about 50 mm, the electromagnetic clutch 24 is turned off. Since the force with which the pair of film conveying rollers 4 conveys the original 1 is set to be larger than the conveying force obtained in the separating and conveying section,
When the electromagnetic clutch 24 is turned off, the original 1 is conveyed only by the film conveying roller pair 4, and the feeding roller 10 and the separation roller 12 are driven to rotate and the original 1 is pulled out from the nip portion.

At the same time when the trailing edge of the original 1 passes the feeding sensor 14, the length of the original 1 is first measured. That is, the distance is calculated by the number of steps given to the motor 22 from when the feeding sensor 14 is turned on to when it is turned off, and the length of the document 1 can be recognized. The half of the length of the original 1 is the length from the rear edge of the original to the center of the original, and
The drive of the motor 22 is controlled so that the image center of the exposure unit 101 of the P-apparatus B coincides with it, and the motor 22 is stopped. Then, when the forward button 20a of the remote controller 20 is pressed, the original 1 on the next page is transferred to the platen glass 10 of the OHP device B by the above-described operation.
2 Set on. Hereinafter, when the page is advanced, the above operation is repeated.

Next, the conveying operation for returning the page of the original 1 will be described. When you press the backward button 20b on the remote control 20,
The motor 22 rotates counterclockwise to rotate the film transport upper roller 4a in the same direction to transport the transport film 2 and the pressing film 3 to the right in FIG. And the second
The transport film 6 and the pressing film 3 are wound by rotating the transport roll 6a and the second pressing roll 6b while slipping at high speed.

Next, the electromagnetic clutch 24 is operated to rotate the feeding roller 10 in the counterclockwise direction. At the same time, while the pickup roller 9 also rotates counterclockwise, the swinging arm 11 rotates counterclockwise about the feeding roller shaft 10a to retract the pickup roller 9 from the feeding tray 7. The original 1 is conveyed in the right direction in FIG. 2, and when it passes through the nip portion of the filmy conveying roller pair 4, the leading end of the original 1 is picked up by the scooping mylar 17 and guided to the discharge path.
Then, when the leading edge of the document 1 is detected by the discharge sensor 18, the pair of discharge rollers 19 is operated and the document 1 is nipped and conveyed by the pair of discharge rollers 19. After the discharge sensor 18 is turned on, the document 1 is conveyed by a predetermined amount and the center of the document 1 on the previous page is located at the OHP device B.
Of the motor 22 so that the image center of the exposure unit 101 of the
Stop driving. At this time, the document 1 is discharged and stacked on the feeding tray 7.

With the above operation, the originals 1 are moved forward or backward so that the originals are loaded on the feeding tray 7 while keeping the page order of the set of originals set with the image side facing upward. Sequential access is possible without breaking.

According to the above-described structure, the presenter can start the presentation simply by placing the originals 1 stacked in page order on the feed tray 7 and operating the remote controller 20. You can quickly prepare for sets and presentations.

Further, since the original document 1 is conveyed in page order and can be arbitrarily accessed, when the original document 1 that has been used once is reused or when the original document 1 is searched for, the target original document 1 can be smoothly moved.
Can be accessed.

When the presenter changes, the manuscript 1 that has been used once can be discharged onto the feeding tray 7 to collect the manuscript 1, and the next presenter can put the original stack on the feeding tray 7. It can be replaced smoothly in a short time just by placing it. Further, since the originals 1 discharged onto the feeding tray 7 are collected in page order, there is no need to rearrange them.

If another original 1 is inserted between the originals 1 during the presentation, the original 1 to be inserted is placed on the feeding tray 7 and is fed to insert the originals 1 between arbitrary originals. Is also possible.

(Lamp ON / OFF operation)

Next, the ON / OFF operation of the lamp 106 provided in the exposure section 101 of the OHP device B will be described. When the power of the OHP device B is turned on and the document stack is placed on the feeding tray 7 and the forward button 20a is pressed using the remote controller 20, the motor 22 is rotated and the document 1 is placed on the platen glass 102.
After being conveyed by a predetermined amount until it is placed on the motor, the motor 22 is stopped. Then, the motor 22 is stopped and the original 1 due to inertia
The lamp 106 is turned on after the counter in the MCOM 36 counts that a predetermined time or more until the conveyance of the above is completely stopped. That is, the lamp 106 is turned on after the elapse of time or more from the time when the forward button 22a is pressed until the document 1 is set on the platen glass 102.

When the projection of the original 1 is completed, the forward button 20a is pushed again using the remote controller 20 to push the platen glass.
A signal is sent to 102 to convey the next original 1, and the remote control receiver 21 receives this signal and at the same time the lamp 106 is turned on.
FF. The motor 22 is rotated after this, and the lamp 106
Is turned off and then conveyance is started. Thereafter, when advancing the original 1 to the next page, the same operation is repeated.

When the document 1 is moved backward, that is, when the backward button 20b of the remote controller 20 is pressed to set the next document 1 on the platen glass 102, the lamp 106 is turned on / off by the backward button 20b as in the case of forward movement. Take control.

According to the above configuration, the lamp 106 in the exposure unit 101 is controlled so as not to be turned on while the original 1 is switched to the next original 1 after the projection of the original 1 is finished. It is possible to prevent the original image to be projected from being projected on the screen and to prevent light from being directly projected on the screen through the transparent area between the originals. Therefore, the audience does not have to follow the image projected on the screen during the transportation of the document in the presentation, and the eyes are not tired or unsightly, and the presentation can be performed more effectively. it can.

Since frequent ON / OFF control of the lamp 106 may shorten the life of the lamp 106, the light amount of the lamp 106 in FIG. The object of the present invention can also be achieved by controlling.

[Second Embodiment]

Another example of the OHP device shown in the first embodiment will be described with reference to FIG. Since the schematic configurations of the OHP device and the document conveying device are the same as those in the first embodiment, the same members are designated by the same reference numerals and the description thereof is cited.

In this embodiment, a light shielding means for shielding the exposure from the exposure section 101 is provided in the vicinity of the lens 105 supported by the arm 103. In FIG. 7, reference numeral 301 is a motor that can be driven to rotate in the forward and reverse directions, and a gear 302 is fixed to the rotation shaft thereof. 303 is a fan-shaped shutter, and a fulcrum 304
It is attached so as to be rotatable around. This shutter
A gear portion 303a is formed on the circular arc surface of 303, and the gear portion 303a meshes with the gear 302. 305,
306 is a limit switch, and the shutter 303 is a fulcrum 304
The rotation of the shutter 301 is stopped by defining the rotation range of the shutter 303 by stopping the drive of the motor 301 by rotating about the center and hitting both side surfaces.

While the document is being transported, that is, while the document is being transported, that is, while the forward button 20a or the backward button 20b of the remote controller 20 is being pressed to transport the next document 1 onto the platen glass 102, the motor 301 is activated to rotate in the normal direction. By driving (rotating in the counterclockwise direction), the shutter 303 is rotated in the direction of the arrow (clockwise direction) in FIG. 7 to cover the front of the lens 105 and block the optical path. Then, the side surface of the shutter 303 hits the limit switch 306 and pushes it to stop the driving of the motor 301. As a result, the exposure from the exposure unit 101 during the conveyance of the document is completely blocked, and the light image is not projected on the screen.

When the motor 22 for conveying the original 1 is stopped and the next original 1 is set on the platen glass 102,
Reverse rotation (clockwise rotation) by starting the motor 301
By driving it, the shutter 303 is rotated in the direction opposite to the arrow direction (counterclockwise direction) in FIG.
Retreat from the optical path of 5. Then, the shutter 303
The side surface of the motor hits the limit switch 305 and pushes it to stop the drive of the motor 301. As a result, the original 1 set on the platen glass 102
It is possible to project an original image obtained by exposing the image on the screen by the exposure unit 101.

[Third Embodiment]

Next, another example of the OHP device shown in the first embodiment will be described with reference to FIG. Since the schematic configurations of the OHP device and the document conveying device are the same as those in the first embodiment, the same members are designated by the same reference numerals and the description thereof is cited.

In this embodiment, the same light-shielding means as in the second embodiment is arranged beside the lens 108 in the exposure section 101. In FIG. 8, a shutter 303 is attached to the side of the lens 108 so as to be rotatable around a fulcrum 304 provided on a support member 307. The shutter 303 covers the front side of the lens 108 and blocks the optical path passing through the lens 108 while the document is being conveyed. The drive mechanism and the light blocking operation of the shutter 303 are the same as those in the second embodiment.

According to the above structure, the light emitted from the lamp 106 passes through the lens 108 after being reflected by the reflecting plate 107, but the optical path is blocked by the shutter 303, so that the exposure is performed outside the OHP device B. More effective light shielding is possible without leakage.

[Fourth Embodiment]

Next, another example of the OHP device shown in the first embodiment will be described with reference to FIG. Since the schematic configurations of the OHP device and the document conveying device are the same as those in the first embodiment, the same members are designated by the same reference numerals and the description thereof is cited.

In this embodiment, the light-shielding means is provided on the side of the original conveying apparatus A. In FIG. 9, 401a and 401b are shutters, which are fulcrums 402a and 402 provided on the frame of the document feeder A on both the left and right sides of the platen glass 102.
It is attached so as to be rotatable around b. Above shutter
A gear 403 is provided on the rotation side of 401a, and a pulley 404 is integrally formed on the rotation side of the shutter 401b. 407 is a motor that can be driven to rotate in the forward and reverse directions, and a pulley gear 406 and a pulley 405 are formed on its rotation shaft. The pulley gear 406 is the shutter 401.
a gear 403 of the timing belt 40 is engaged between the pulley 405 and the shutter 404 of the shutter 401b.
8 wound.

The shutters 401a and 401b are used to convey a document, that is, to use the forward button 20a or the backward button of the remote controller 20.
While the next original 1 is being conveyed on the platen glass 102 by pressing 20b, the pulley gear 406 is activated by activating the motor 407 to drive it in the normal direction (rotate in the counterclockwise direction).
The shutters 401a and 401b are rotated in the direction of the arrow in FIG. 9 via the pulley 405 and the timing belt 408 to cover the platen glass 102 and block the optical path.

When the next document 1 is set on the platen glass 102 after the document feeding operation is completed, the motor 40
9 is driven to rotate in the reverse direction (rotate in the clockwise direction) to rotate the shutters 401a and 401b in the direction opposite to the direction of the arrow in FIG. 9 and retract from the optical path on the platen glass 102. Stand at the position indicated by the solid line. As a result, an original image obtained by exposing the original 1 set on the platen glass 102 by the exposure unit 101 can be projected on the screen.

[0112]

As described above, according to the present invention, the document image to be scrolled is projected on the screen or the light is reduced by shutting off the exposure by the exposure unit or reducing the light amount of the light source while the document conveying unit conveys the document. Can be prevented from being projected directly on the screen. Therefore, the audience does not have to follow the image projected on the screen while the document is being conveyed in the presentation, and the eyes are not tired or unsightly, and the presentation can be performed more effectively. .

[Brief description of drawings]

FIG. 1 is an OHP using the document feeder according to the first embodiment.
It is an external view explanatory drawing of an apparatus.

FIG. 2 is an explanatory cross-sectional configuration diagram of an OHP device equipped with a document feeder.

FIG. 3 is an explanatory diagram of a drive system of a document feeder.

FIG. 4 is an explanatory diagram of a configuration of a pickup roller of a document feeder.

FIG. 5 is an explanatory diagram of a transport film.

FIG. 6 is a block diagram showing a control system of an OHP device and a document feeder.

FIG. 7 is an explanatory diagram showing a configuration of an OHP device according to a second embodiment.

FIG. 8 is an explanatory diagram showing a configuration of an OHP device according to a third embodiment.

FIG. 9 is an explanatory diagram showing a configuration of an OHP device according to a fourth embodiment.

FIG. 10 is an explanatory diagram of a conventional document feeder.

[Explanation of symbols]

A ... Original transport device B ... OHP device 101 ... Exposure unit 102 ... Platen glass 103 ... Arm 104 ... Reflective mirror 105, 108 ... Lens 106 ... Lamp 107 ... Reflector plate 109 ... Reflective mirror 1 ... Original 2 ... Transport film 3 ... Pressing Film 4 ... Film transport means 4a, 4b ... Film transport roller pair 4c, 4d, 4e, 5e, 5f, 6e, 6f, 10b, 19
c, 22a, 24a, 404, 405 ... pulley 5 ... first winding means 5a ... first transport roll 5b ... first pressing roll 5c ... first transport roll shaft 5d ... first pressing roll shaft 5g, 6g, 302, 403 ... Gear 6 ... 2nd winding means 6a ... 2nd conveyance roll 6b ... 2nd pressing roll 6c ... 2nd conveyance roll shaft 6d ... 2nd pressing roll shaft 7 ... Feed tray 8 ... Guide member 9 ... Pickup roller 9a ... Pickup roller shaft 10 ... Feed roller 10a ... Feed roller shaft 11 ... Swing arm 12 ... Separation roller 12a ... Separation roller shaft 13a ... Feed upper guide 13b ... Feed lower guide 14 ... Feed sensor 15 ... Film mark Sensor 16 ... Tension roller 17 ... Scooping mylar 18 ... Ejection sensor 19 ... Ejection roller pair 19a ... Ejection roller 19b ... Ejection roller 20 ... Remote control 21 ... Remote control receiver 22, 301, 407 ... Motors 23, 25, 26, 31, 408 ... Timing belt 24 ... Electromagnetic clutch 27, 32 ... One-way gear 28, 33 ... Caulking shaft 29, 30, 34, 35 ... Torque limiter 36 ... MCOM 303, 401 a, 401 b ... Shutter 304, 402 a, 402 b ... Support point 305, 306 ... Limit switch 307 ... Support member 406 ... Pulley gear

Claims (4)

[Claims] 1. A projection device for projecting a document image onto a screen by irradiating the document image with light from an exposure unit, and a document transport unit for transporting the document onto the exposure unit, and ON / OFF control of a light source in the exposure unit. And a control unit, wherein the control unit controls the light source to be turned off while the document conveying unit conveys the document. 2. A projection device for projecting a document image onto a screen by irradiating the document image with light from an exposure section, and document control means for transporting the document onto the exposure section, and control for controlling the light amount of a light source in the exposure section. The projection device is characterized in that the control unit controls the light amount of the light source to be lower than that during exposure of the document while the document transport unit is transporting the document. 3. A projection device for projecting a document image onto a screen by irradiating the document image with light from an exposure unit, and a document transport unit for transporting the document onto the exposure unit, and an optical path from a light source in the exposure unit to the screen. And a light-shielding unit capable of advancing and retreating, wherein the light-shielding unit advances to the optical path and shields light while the document conveying unit is conveying the document. 4. The projection device according to claim 1, 2, or 3, wherein the projection device is an overhead projector.