JPH0469372B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an overhead projector, and more particularly to an automatic document feeder that automatically feeds a document onto a document table.

[Prior art]

Conventional overhead projector (hereinafter referred to as
(abbreviated as OHP), when explaining the content projected on the screen, the explainer or explanation assistant had to manually replace the OHP manuscript one after another while explaining at the same time. When changing to a document, the user's attention is focused on replacing the original, resulting in problems such as interruptions in the explanation, or delays in the timing of replacement, making it difficult to provide a smooth explanation.

[Purpose of the invention]

The present invention is intended to eliminate and improve the above-mentioned drawbacks of the prior art. An object of the present invention is to provide an OHP automatic document feeder that can automatically replace a document with the next document, thereby solving the above-mentioned problems.

[Structure of the invention]

The automatic document feeder for an OHP according to the present invention includes a delivery device equipped with a delivery roll and a first motor, a delivery roll and a second motor, respectively, at the front and rear positions of a document table formed on the top surface of the main body of the OHP in the document transport direction. A discharge device equipped with a motor is provided, and a start switch drives the first and second motors to discharge the original on the document table by the discharge roll, and at the same time, the next document is placed on the document table by the delivery roll. The first and second motors of the sending device and the ejecting device are stopped by detecting the passage of the document sent onto the document table by the sending device using a microswitch.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an OHP automatic document feeder, and the automatic document feeder of the present invention has the following features:
A sending device 4 provided at the front in the transport direction of the document 3 on the document table 2 on the top surface of the OHP main body 1, an ejecting device 5 provided at the rear in the transporting direction, and a starting switch 6 for starting the sending device 4 and the ejecting device 5. , a micro switch 7 that detects the passage of the document 3 fed onto the document table 2 by the feed device 4 and stops the drive of the feed device 4 and the discharge device 5.

The feeding device 4 includes a feeding section 8 that stores a plurality of original documents 3 and separates and feeds the documents one by one, a feeding roller 9 that conveys the fed originals 3 onto the document table 2, and a feed roller 9 that drives the feeding section 8. The ejecting device ₅ includes a ejecting roll 11 for ejecting the document 3 to the outside of the machine and a second motor M1 for driving the ejecting roll 11.
It is composed of M ₂ .

The feeding section 8 is a well-known device commonly used in copying machines and the like, and is equipped with a feeding roller 10 that separates and feeds the originals 3 one by one.

In this embodiment, the start switch 6 is a remote control operation box 1 pulled out from the OHP main body 1.
2, and the explainer can operate the start switch 6 by holding this operation box 12 at hand. The micro switch 7 is installed in the vicinity of the delivery roll 9 in the OHP main body 1, and is used to detect the passage of the sheet-like original 3. In this embodiment, the mechanical It is configured to operate when pressed.

Next, the operation of an embodiment of the present invention will be explained using FIG. 3, which is an electric circuit diagram thereof.

The first and second motors M ₁ and M ₂ are connected in parallel with the power source 13 , and these motors and the power source 13
A starting switch 6 and a micro switch 7 are connected in parallel to one of the connection terminals.

When replacing the original 3, when the explainer turns on the start button 6 of the operation box 12 held at hand,
The first and second motors M ₁ and M ₂ start driving in synchronization, and the delivery roll 9 and discharge roll 11 connected thereto start rotating at the same time. At this time,
The lowest original 3 among the many stored originals 3 is sent from the sending device 4 and the feeding section 8 to the sending roll 9 by the feeding roll 10, and the original 3 is conveyed from the sending roll 9 onto the document table 2. At the same time, the discharge roll 10 discharges the already projected original 3 out of the machine.

Also, during this time, the leading edge of the document 3 sent to the document table 2 passes over the micro switch 7, so the micro switch detects this and turns on, and the explainer releases the start switch 6 on the operation box 12 to start the process. Even after the switch is turned off, the circuit between the motors M ₁ and M ₂ and the power supply 11 is closed, so the motors M ₁ and M ₂ continue to rotate, and the replacement of the document 3 is completely completed. The delivery roll 9 and the discharge roll 11 are driven up to this point.

When the end of the document 3 being conveyed onto the document table 2 passes over the micro switch 7, the micro switch 7 is turned off and the circuit is opened, so that the motors _M1 and
The rotation of M ₂ is stopped, and the rotation of the delivery roll 9 and the discharge roll 11 is stopped.

The above operation will activate the start switch on the control box.
This is automatically performed every time the switch is turned on, and the original 3 that has been projected and the explanation has been completed is ejected from the original table 2, and the next original is sent to the original table 2 and replaced.

〔Effect of the invention〕

The present invention has the above-described configuration, and the document can be automatically conveyed and ejected by pressing a button manually, so the operator does not have to worry about operating the projector. This has the effect of allowing you to concentrate on explaining the images on the screen.

[Brief explanation of the drawing]

FIG. 1 is an overall perspective view showing one embodiment of the present invention, FIG. 2 is a schematic sectional view showing the main mechanism of FIG. 1, and FIG. 3 is an electric circuit diagram showing electrical connections of the present invention. be. Explanation of symbols, 1... Overhead projector main body, 2... Original table, 3... Document, 4... Feeding device, 5... Ejecting device, 6... Start switch, 7
... Micro switch, M ₁ , M ₂ ... Motor.

Claims (1)

[Claims] 1. Provided in front of the document table formed on the top surface of the main body of the overhead projector in the document conveyance direction,
a sending device including a sending roll that sends out the original onto the document table; a first motor that drives the sending roll; and a discharge roller that is provided at the rear of the document table in the document transport direction and that discharges the document on the document table. an ejection device including a second motor for driving the ejection roll; a start switch for operating the first and second motors; An automatic document feeder for an overhead projector, comprising a feeder and a microswitch for controlling the ejector.