JPH0822073A - Overhead projector Document feeder device and overhead projector - Google Patents

Abstract

(57) [Abstract] [Purpose] Overhead projector (hereinafter OHP)
In No. 16, a measure is provided that does not hinder the use of the next presenter such as when the presenter left the OHP document on the OHP document feeder to turn off the power, or when a sheet remains inside the device. provide. [Structure] Therefore, the O
A tray sheet detection sensor 30 for detecting the presence / absence of an HP document and a sheet detection sensor for detecting the presence / absence of an OHP document in the OHP document feeder are provided, and the OHP document conveying means is controlled by an output signal from either of them. Configured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet conveying apparatus (original feeder) which can be mounted on an overhead projector for projecting a sheet original having information such as images and graphs on a screen, and an overhead provided with this sheet conveying apparatus. The present invention relates to a projector (hereinafter referred to as "OHP").

[0002]

2. Description of the Related Art This type of OHP device has been widely used in technical presentations and other applications.

[0003]

However, the following problems have often been encountered with these applications. That is, 1) In an OHP document feeder for holding and transporting an OHP document between upper and lower transparent transport films, if the previous presenter turns off the power while leaving the OHP document on the feeder, the next presenter However, when he tried to convey his own document without noticing it, there was a problem that the upper limit of the number of stored documents could be caught and the document could not be conveyed any more.

2) In an OHP document feeder that conveys an OHP document sandwiched between upper and lower transport films of this type, if the previous presenter left the OHP document on the feeder and turned off the power, or Even if there is no original sheet on the paper tray, the sheet remains inside the apparatus, and when the paper feeding / conveying operation is performed, there is a problem that there is no room for the conveying film.

3) Furthermore, due to the above reasons, in the worst case, the device may be broken or destroyed, and the reliability of the device may be greatly affected.

The present invention has been made in view of the above situation, and even if the previous user left the original on the OHP feeder or inside the apparatus, the next OHP user can use it without any trouble. The purpose is to provide a means of obtaining.

[0007]

Therefore, according to the present invention, an OHP document feeder of this type is provided as an OHP document feeder for nipping and conveying an OHP document between upper and lower transparent conveying films. And a tray sheet detecting means for detecting the presence or absence of the OHP original placed on the original feeding tray, as well as a conveying means for conveying the conveying film and the OHP original. In addition, OH is placed in the OHP document feeder.
It is intended to achieve the above-mentioned object by providing a sheet detecting means for detecting the presence or absence of the P document and further by controlling the conveying means by the output of each detecting means. It is a thing.

[0008]

With the above-described configuration of the present invention, the previous OHP
Even if the user leaves the OHP original on the feeder or the sheet remains inside the apparatus, the next OHP user can use it without trouble by appropriately controlling the conveying means.

[0009]

EXAMPLES The present invention is described below based on examples:
FIG. 1 shows a configuration diagram of an OHP document feeder (hereinafter referred to as “OHP feeder”). OHP feeder is OH
It is mounted so as to cover the document placement surface of P16. The operator can stack the displayed originals on the OHP feeder in advance and perform remote operation (single original feeding / fine original position fine adjustment / original discharging) by an infrared remote controller (not shown) or the like.

1 is an OHP projected by the OHP 16.
It is a manuscript. A tray sheet detection sensor (not shown) for detecting whether or not a sheet is set on the paper feed tray is provided in the paper feed tray. A pickup roller 2 is interlocked with the conveyance motor 5 and the electromagnetic clutch 4 to separate and convey the document 1 from the upper side. 3 is a paper feed roller.

The separated and conveyed original 1 reaches the position of the registration sensor 13 through the conveying path, is further conveyed, and is pinched by the nip roller 9 which rotates in conjunction with the conveying motor 5 and the transparent upper conveying film 10 and the lower side. It is sandwiched by the transport film 11 and transported to the display stage in the direction of arrow F and stopped.

At this time, it is possible to measure the length of the document currently being conveyed and the position of the document 1 being conveyed by the number of output pulses of the clock sensor 7 detected while the registration sensor 13 is on. is there. 6 is a clock sensor 7
Shows a clock disc of.

In this way, the original 1 stopped on the display stage is conveyed by the transport film 1 as required by the operator.
It is also possible to make fine adjustments by slightly moving 0 and 11. The document 1 that has finished being displayed is further conveyed from the display stage, is wound around the film winding roller 8d, and is conveyed in a state in which the next document has a certain interval.
In this way, this operation is performed until all the originals 1 are displayed.

When the document display is completed and the displayed document is discharged, the transport motor 5 is rotated in the reverse direction to transport the document 1 in the direction opposite to the document transport direction (arrow R).
The original conveyed from the film winding roller 8d is
When passing through the display stage and leaving the nip roller 9, the upper transport film 10 and the lower transport film 11 are released. When the document 1 is further conveyed, the document is scooped upward at the branch point of the conveyance path, and the document advances toward the paper ejection path.

The original document 1 that has entered the paper ejection path is ejected out of the apparatus by the paper ejection roller 12 as it is. Paper ejection sensor 14
Monitors the conveyance state of the original on the paper discharge path. A sheet detection sensor (not shown) for detecting the sheets accumulated in the apparatus is provided.

This operation is repeated until all the originals are ejected. At this point, the home position marker on the transport film is detected by the film marker sensor 15, and it is confirmed that the transport film is at the home position.

FIG. 2 shows a circuit block diagram of the OHP feeder. The OHP feeder in this embodiment is a one-chip microcomputer (hereinafter referred to as "microcomputer").
It is mainly composed of. The microcomputer 23 has a ROM 24 storing a control program, a RAM 25 as a work area for arithmetic operations, and an E ² PRO as a non-volatile memory.
M26 etc. are connected.

At the input port of the microcomputer 23, a registration sensor 13 provided on the transport path, a sheet discharge sensor 14 provided on the sheet discharge path, a film marker sensor 15 for detecting the reference position of the transported film, and a paper feed. A tray sheet detection sensor 30 for detecting sheets on the tray, a sheet detection sensor for detecting sheets inside the apparatus, various setting switches 21 and the like are connected.

Further, the interrupt terminal of the microcomputer 23 receives key information from the clock sensor 7 for obtaining the document movement amount reference clock from the rotation of the clock disk directly connected to the shaft of the carry motor 5 and the infrared remote controller. The infrared remote control sensor 22 and the like are connected. In addition, the output port of the microcomputer is equipped with a conveyance motor 5, an electromagnetic clutch 4, and a display LED.
Etc. loads are connected.

Next, FIG. 3 shows an explanatory view of the OHP feeder document stop position control. Usually, since the display original is desired to be placed in the center of the display stage, the original is placed so that the center of the display original is aligned with the center of the display stage.

Therefore, the amount of original conveyance until the center of the original moves to the center of the display stage is k ₀ + (L + K) / 2 where L is the length of the display stage k is the length of the original in the conveying direction k _{0 is the} registration sensor 13 to It is expressed as the distance to the edge of the display stage.

By the way, L and k ₀ are values determined in terms of the apparatus configuration, but k is not uniform due to the size of the document placed and the difference between vertical and horizontal feed. Therefore, k needs to be measured during document transportation.

FIG. 4 shows the output states of the registration sensor 13 and the clock sensor 7 shown in FIG. 2 during document conveyance.
By measuring the number of clock pulses while the document is passing through the registration sensor, the document length (k) = the number of clock pulses × the amount of document advance per pulse can be obtained.

FIGS. 5 and 6 are explanatory views of the document interval control.

When the original is placed in the center of the display stage, the next original is not placed on the display stage (display section).
The document spacing shown below is required.

(L−K) / 2 where: L is the length of the display stage k is the length of the document in the conveying direction Further, when the document placed on the display stage is slightly moved and fine adjustment is performed, the maximum fine adjustment is performed. The following document intervals are required so that the leading edge of the next document does not reach the display stage even if the document is moved by an amount.

Δk + (L−k) / 2 where L is the display stage length k is the document length in the transport direction, Δk is the maximum amount of fine adjustment of the document, and FIG. 7 shows the transport motor drive circuit. The carry motor drive circuit is composed of a transistor bridge circuit for rotating the carry motor forward and backward.

As an example, when the motor current I _M flows in the A ← B direction, if the rotation direction is the document advance direction, CP
When U turns on each transistor Q2, Q3, Q5,
The document moves in the forward direction. The power supply voltage supplied to the carry motor 5 (FIGS. 1 and 2) can be stepped down to an arbitrary value by PWM control of the ON signal of the switching transistor Q5 of the switching circuit.

As a result, the rotation speed of the carry motor 5 can be controlled arbitrarily. Therefore, the document conveyance speed can be changed by changing the ON signal pulse width of the switching transistor Q5 according to the setting of the conveyance speed. Further, by driving the document conveyance speed at a low speed for a short motor-on time and monitoring a predetermined number of clock pulses, the document position fine adjustment operation (advancing direction) can be performed.

In order to set the original transport direction to the return direction, the motor current I _M can be set to the A → B direction and the same control as above can be performed.

(Other Embodiments) FIG. 8 shows another embodiment of the carry motor drive circuit. The carry motor drive circuit is composed of a transistor bridge circuit for rotating the carry motor forward and backward.

As an example, when the motor current I _M flows in the A ← B direction and the rotation direction is the forward direction of the document, the CPU
When the transistors Q2 and Q3 turn on, the document moves in the forward direction. The power supply voltage supplied to the carry motor 5 can be effectively reduced by PWM-controlling the ON signal of the transistor Q2.

As a result, the rotation speed of the carry motor 5 can be controlled as desired. Therefore, the document conveyance speed can be changed by changing the ON signal pulse width of the transistor Q2 according to the setting of the conveyance speed. Further, by outputting the on-pulse signal of the transistor Q2 for a short time, the document position fine adjustment operation (forward direction)
It can be performed.

In order to set the original transport direction to the return direction, the motor current I _M can be set to the A → B direction and the same control as above can be performed.

FIG. 9 shows a flow chart of the document feeding check sequence when the power is turned on. When the power is turned on, first in step S50, it is checked whether or not the film is in the home position. When the transport film is at the home position, it is in a standby state for an operation signal from the infrared remote controller (step S52). If the transport film is not at the home position, the transport film home position marker search operation is started in step S54, and the transport film is advanced by a predetermined amount m in the advance direction.

If the home position marker can be detected during that time, the transport film is stopped at that time (step S58), and the operation signal standby state from the infrared remote controller is entered (step S52).

During this time, if the home position marker cannot be detected, the transport film is stopped and the feeding operation is ended (step S60).

Next, in step S62, the transport film is advanced in the returning direction by a predetermined amount of 2 m. If the home position marker can be detected during that time, the transport film is stopped at that point and the operation signal standby state from the infrared remote controller is entered (step S58).

During this time, if the home position marker cannot be detected, the transport film is stopped and the returning operation is completed (step S66).

At this point, it is determined that the manuscript of the former presenter is still caught inside the OHP feeder, and step S68
Press to move all documents. This operation is step S70.
It continues until the transport film home position marker is detected in step S58, and if it is detected, step S58.
Then, the transport film is stopped, and in step S52, the operation signal standby state from the infrared remote controller is entered.

FIG. 10 shows a flowchart of another embodiment of the document remaining check sequence at power-on. When the power is turned on, first, it is checked whether or not the original document remaining flag "1" is written in the E ² PROM 26 shown in FIG. 2 (step S80). This flag is written so that it becomes "1" at the time when the original is conveyed and caught and becomes "0" at the time when all the originals are discharged.

If the original remaining flag is "0", the flow advances to step S82 to enter the operation signal standby state from the infrared remote controller. If the original remaining flag is "1", it is determined that the original presenter's original is still caught in the OHP feeder, and the entire original discharging operation is started in step S84.

This operation is continued until the transport film home position marker is detected in step S86. If detected, the transport film is stopped in step S88, and the document remaining flag "0" is set in step S90. In step S82, a standby state for an operation signal from the infrared remote controller is entered.

Next, the entire operation sequence will be described with reference to the flowchart shown in FIG. 11; the initial operation is performed from the time when all originals are written so as to be "0" when they are ejected as described above. This means that the process is completed (step S100). Next, in step S200, an operation standby state is entered, and if an operation signal is detected by the infrared remote control light receiving sensor 22 (FIG. 2), the CPU 23
The signal contents are analyzed to determine whether the single-sheet feed operation mode, the fine investigation mode, or the all-document discharge operation mode is determined, and the one-sheet feed operation mode sequence, the fine adjustment operation mode sequence, the all-document discharge operation mode Send a command to each operating mode sequence to execute the sequence.

Here, 1 according to the flowchart of FIG.
The sheet feeding operation will be described; first, it is determined whether or not a command for the single sheet feeding operation mode has been sent from the operation standby state (step S300), and if so, the conveyance motor 5 and the electromagnetic motor in FIG. The clutch 4 is turned on (step S400) to separate and feed the document from the upper side. Next, the leading edge of the separated and fed document is the registration sensor 1
Pulse count after passing 3 (step S500)
Then, the amount of movement of the document and the length of the document are started to be measured. If the leading edge of the document is caught by the nip roller 9 (FIG. 3), the electromagnetic clutch 4 is turned off and the sheet feeding operation is completed (step S6).
The pulse count at 00 turns off the electromagnetic clutch in step S700).

Since the original is sandwiched between the upper transport film and the lower transport film, it is transported as it is, and if the rear end of the document is detected by the registration sensor 13, it should be placed at the center of the display stage rather than the length of the original. After counting the number of pulses (step S800), the carry motor 5 is turned off (step S1000). The transport speed at this time is
It is possible to select one of a plurality of set values and select the transport speed for the single-sheet feeding operation.

In step S1000, when the carry motor 5 is turned off, the process proceeds to step S1100, and it is determined whether the fine adjustment operation is to be performed. If the fine adjustment operation mode is selected here, the process proceeds to step S1500 to perform the fine adjustment operation. . However, if the fine adjustment operation mode is not selected here, the process advances to step S1200 to determine whether to feed the next original. Here, if the next original is not fed,
In step S1300, it is determined whether or not it is the document discharge operation. If it is the document discharge operation, the process advances to step S1400 to perform all document discharge processing, and returns to the initial step S100.

If the document discharge operation is not selected in step S1300, the process returns to step S1100. If the next original feeding operation is selected in step S1200, the flow advances to step S1600 to perform the transport film processing, the original number excess and the original number counting processing in step S1700, and then the flow returns to step S400. The above is the overall operation.

Next, the sequence of the fine adjustment operation mode will be described with reference to the flowchart of FIG. 12; first, if the fine adjustment operation mode is entered, the transport film process is performed in step S100, and then the process proceeds to step S150, in which the fine adjustment amount clock is supplied. Set the pulse (the pulse value here can be set arbitrarily). Then step S200
Then, it is determined whether or not the counting of the clock pulse is completed, and if the counting is not completed, the step S20 is performed.
At 0, wait for the count to finish. When the counting is completed in step S200, the process proceeds to step S250 to carry out the transport film ending process. The fine adjustment operation mode is performed as described above.

Next, the danger avoidance mode of the apparatus is shown in FIG.
Will be described based on the flowchart of step S20.
In 01, it is determined whether or not the OHP document 1 is placed on the tray of the OHP document feeder device shown in FIG. 1. If not, the process proceeds to step S2002,
If it is placed, the process proceeds to step S2003. Then, in step S2002, it is determined whether or not the OHP document 1 is loaded in the OHP document feeder device. Similarly, in step S2003, it is determined whether the OHP document 1 is loaded in the OHP document feeder. Steps S2002 and S2
At 003, if the OHP original 1 is not loaded in the OPH original feeder, the processing is ended without performing the subsequent processing.

However, here, if the OHP document 1 is still loaded in the OHP document feeder, the process proceeds to step S2004, and the sheet discharge control is performed. Then, if it is confirmed here that all the sheets have been discharged, the process proceeds to step S2005.
In step 06, the sheet discharge control is stopped, and the process ends. By performing the above operation when the power is turned on or between the first presenter and the second presenter,
Even if the document is left on the P feeder, it can be correctly discharged from the apparatus until the next user uses it, and no trouble occurs.

[0052]

As described above, according to the present invention,
The previous speaker who used the overhead projector
An OHP feeder device and an overhead projector equipped with this device, which enables the user to correctly discharge the document from the device before the next use even if the document is left on the HP feeder. Could be provided.

That is, even if the previous presenter left the original document left on the OHP feeder, the next user will correctly eject it from the device before using it without any trouble.
This overhead projector allows presentation presentation without worrying about the number of sheets.

Furthermore, with the above-mentioned configuration, there is no fear of causing a failure or destruction of the device, the operator can use the device with peace of mind, and the reliability of the device is greatly improved. It was possible to provide an overhead projector equipped with.

[Brief description of drawings]

FIG. 1 OHP feeder configuration diagram

FIG. 2 is a block circuit diagram of an OHP feeder.

FIG. 3 is an explanatory diagram of document stop position control

[Figure 4] Illustration of original length measurement

FIG. 5 is an explanatory diagram of document interval control (part 1)

FIG. 6 is an explanatory diagram of a document interval control (No. 2)

FIG. 7: Conveyor motor drive circuit diagram

FIG. 8 is another embodiment of the conveyance motor drive circuit diagram.

FIG. 9: Manuscript remaining check sequence

FIG. 10 is a flowchart of another embodiment of FIG.

FIG. 11 is an overall operation sequence flowchart

FIG. 12 is a flow chart of a fine adjustment operation mode sequence.

FIG. 13: Risk avoidance mode sequence flowchart

[Explanation of symbols]

 1 OHP Original 2 Pickup Roller 3 Paper Feeding Roller 4 Electromagnetic Clutch 5 Conveying Motor 6 Clock Disc 7 Clock Sensor 8a-8d Film Winding Roller 9 Nipping Roller 10 Upper Conveying Film 11 Lower Conveying Film 12 Paper Ejecting Roller 13 Registration Sensor 14 Ejecting Paper sensor 15 Film marker sensor 16 OHP (overhead projector) 23 CPU 30 Tray sheet detection sensor

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shunji Sato 3-30-2 Shimomaruko, Ota-ku, Tokyo Canon Inc.

Claims (5)

[Claims] 1. An OHP document feeder for sandwiching and transporting an overhead projector document (hereinafter referred to as an OHP document) between upper and lower transparent transport films, and a transport means for transporting the transport film and the OHP document. And the OH placed on the document feed tray.
An OHP document feeder, comprising a tray sheet detecting means for detecting the presence or absence of a P document. 2. An OHP document feeder for nipping and transporting an OHP document between upper and lower transparent transport films,
An OHP document feeder device comprising: a transport unit for transporting the transport film and an OHP document, and a sheet detection unit for detecting the presence or absence of the OHP document in the OHP document feeder. 3. The conveying film and the OHP according to the output signals of the tray sheet detecting means and the sheet detecting means.
The OH according to any one of claims 1 and 2, characterized in that it is configured to control a conveying means for conveying an original.
P document feeder device. 4. The conveying film and the OHP according to the output signals of the tray sheet detecting means and the sheet detecting means.
4. The OH according to claim 3, wherein the control of the feeding direction of the feeding means for feeding the document is prohibited.
P document feeder device. 5. OH according to any one of claims 1 to 4.
An overhead projector comprising a P document feeder device.