JPS6340446A - Manual system scanner - Google Patents

Abstract

PURPOSE:To prevent data transfer failure from occurring and to avoid misreading by executing an alarm display by means of a display means at the time of detecting the speed faster than a prescribed value. CONSTITUTION:If the speed of manual operation by an operator's manual operation exceeds that of inside data processing, a time monitor circuit 12 outputs an output signal informing of the excess, and a brake part driving circuit 14 is driven. With the trigger of the brake part driving circuit 14, a current flows in a coil wound to a magnet 31, a brake for damping 32 is drawn, and the tip of it is pressure-welded to a rubber roller 61, whereby the braking of said roller 61 is attainable, and misreading can be prevented.

Description

TECHNICAL FIELD The present invention relates to a manual scanner, and more particularly to a manual scanner suitable for preventing reading errors.

2. Description of the Related Art Conventionally, there is a manual scanner as a device that is manually moved over the surface of a document and optically reads image information (data) on the surface of the document. An example of the configuration of this conventional manual scanner is shown in FIG. In FIG. 5, ■ is a light source for illuminating the original 6, 2 is an image sensor for extracting image data from the reflected light from the original 6, and 13 is a timing detector for detecting the timing for extracting image data. , 4 are light sources 1. Image sensor 2. Timing detector 3. A control circuit for controlling the external interface circuit 5 and transmitting the image data read from the original 6 to an external device (not shown) as digital signal data; 5 is for transmitting the data extracted from the image sensor 2 to the outside; This is an interface circuit. A perspective view of a manual scanner having such a configuration is shown in FIG. This is the fifth
This figure shows details of the timing output mechanism of the timing detector 3 of the manual scanner shown in the figure. In Figure 6, 6
1 is a rubber roller that rotates when the scanner is scanned by manual operation, 62 is an encoder fixed on the same axis as the rubber roller 61, 63 is a photosensor provided to sandwich the encoder 62, and 64 is a sensor from the photosensor 63. A printed circuit board on which a pulse generator, etc. that generates timing based on the output is mounted, 65 is an illumination LED that irradiates light onto the document surface, 66 is a mode changeover switch,
67.68 are side plates provided at both ends of the rubber roller 61;
69 is a frame board, 70 is a frame board, and 7] is a PSU board. A timing signal can be generated based on the movement of the rubber roller 61 of these mechanisms on the document surface.

In the case of this method, data from the image sensor 12,
To transfer the DATA signal shown in FIG. 7, the pulse signal T1 generated from the timing detector 3 generates a signal T2, which is used as a clock.

Then, at time t7, one data block (for example, 172
8 bits) transfer is completed. However, if the manual operation is performed too quickly, the rubber roller 61. The rotation of the encoder 62 becomes faster and the period of time t1 becomes shorter.1. <12
In this case, there is a problem that t2 is re-triggered during the transfer of one block, t2 is disturbed, and a data transfer failure occurs. This data transfer failure is caused by
This may cause scanner reading errors.

Purpose The purpose of the present invention is to provide a manual scanner that can eliminate such conventional problems, monitor the speed of manual operation by an operator, and prevent reading errors in order to prevent data transfer failures. be.

Configuration - In order to achieve the object described above, the manual scanner of the present invention includes a light source that irradiates light onto the document surface, a sensor that detects reflected light from the document surface and extracts image data, and a sensor that detects the reflected light from the document surface and extracts image data. A manual scanner having a timing generator that generates synchronization timing for image data transfer is provided with a means for detecting the manual operation speed and a display means for displaying an alarm to the operator. The system is characterized in that when the speed of

Hereinafter, the configuration of the present invention will be explained in detail using examples.

FIG. 1 is a configuration diagram of a control section of a manual scanner showing an embodiment of the present invention. This is provided in the control circuit 4 of a manual scanner as shown in Fig. 5, and since the overall configuration of the manual scanner is the same as the conventional one, please refer to Fig. 5. . Here, the broken line portion is provided in the control circuit 4, and the display device 15
is installed at a position where the operator can see it visually, and the brake device 16 is installed at a position where it can brake the rubber roller 61 as shown in FIG. Time monitoring circuit 11゜ Time monitoring circuit 12゜ for monitoring the second time ゜ Alarm drive circuit 132 for driving an alarm by the output of the time monitoring circuit 11 2 Braking section for driving the braking device 16 by the output of the time monitoring circuit 12 Drive circuit 14. Consists of a data transfer circuit j7 that transfers data.

In this embodiment, 12)1. shown in FIG. Before this becomes the time monitoring circuit 1. By checking L and 12, setting an alarm using the alarm drive circuit 13, and applying braking using the brake section drive circuit 14,
This prevents the occurrence of data transfer failures and prevents reading errors in manual scanners. The operation shown in FIG. 1 will be explained below.

The signal from the timing detector 3 is input to the time monitoring circuit 11 and compared with a preset time, and if the period is less than that, the alarm drive circuit 13 is triggered and the display device]5 drive to flash a lamp or generate an alarm sound.

Further, the signal from the timing detector 3 is simultaneously input to the time monitoring circuit 12, and similarly, when the signal reaches a predetermined time or less, the control section drive circuit 14 is triggered to control the braking section? f1
．． 7 to drive the s and limit the speed? The signal from rza)(hereafter kakki・)H Harade device 3 is,
It is also input to the data transfer circuit 17. Since the operation of the data transfer circuit 17 is the same as the conventional one, the details will be omitted.

FIG. 2 is a diagram for explaining details of the time monitoring circuit 11.12 in FIG.
2, and (b) shows a time chart of the circuit.

The pulse A from the timing detector 3 is input to the first time measuring circuit 21, which always outputs a B signal with a time width of tB. Also, based on this, the second time measurement circuit 22
outputs a signal C having a time width tc. These outputs are input to the AND circuit 23, and (j B + j c
) < j +, D does not come out, but (1B+1
゜)〉When tl is reached, a signal D is output and can be used as a trigger for the next circuit.

FIG. 3 is a diagram of the braking mechanism of the braking device 16 of FIG. 1.

This shows a method of applying a brake to the rubber roller 61 shown in FIG. 6 using a magnet. In FIG. 3, 61 is a rubber roller (see FIG. 2), 31 is a magnet for bringing the braking brake 32 into pressure contact with the rubber roller 61, 32 is a braking brake for the rubber roller 61, and 33 is for releasing the brake from the rubber roller 61. It is a spring to keep it in place.

The rubber roller 61 can be braked by attaching the braking mechanism having such a configuration to the timing detection mechanism shown in FIG. For example, a coil or the like is wound around the magnet 31, and the terminal drawn out from the coil is connected to the first terminal.
It is connected to the brake section drive circuit 14 shown in the figure. and,
When the manual operation speed exceeds the internal data processing speed due to manual operation by the operator, the time monitoring circuit 12 outputs an output signal notifying this fact, and the brake section drive circuit 14 is driven. The trigger of the brake drive circuit 14 causes current to flow through the coil wound around the magnet 31, pulling the brake 32 and pressing its tip against the rubber roller 61. This makes it possible to brake the rubber roller 61, thereby preventing reading errors and the like. Furthermore, when the operating speed decreases below a certain constant speed, the output from the control section drive circuit 14 is turned off. With this off operation, no current flows through the coil of the magnet 31, and the pressure of the braking brake 32 against the rubber roller 61 is released by the force of the spring 33.

Furthermore, if a rubber roller or the like is not used as a timing detector, it is also possible to have an obstacle protrude directly onto the document surface. An example of this is shown in FIG.

In FIG. 4, a brake rubber 41 provided on a brake 42 is driven by a magnet 45 and is pressed directly against the document surface. Thereby, reading errors can be prevented. In addition, in the above drive, the rear end 44 of the brake 42 is made of a material that is attracted to the magnet 45,
It is normally kept away from the magnet 45 by a spring 43.

In this embodiment, an example in which the display device 15 and the braking device 16 are provided has been described, but it is also possible to provide only the display device 15 and notify the operator of an abnormality through an alarm display or an alarm warning sound.

Effects As explained above, according to the present invention, it is possible to monitor the manual operation speed by the operator to prevent data transfer failures, and to prevent reading errors.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of a control section of a manual scanner showing an embodiment of the present invention, FIG. 2 is a diagram for explaining details of the time monitoring circuit shown in FIG. 1, and FIG. A diagram of the braking mechanism of the braking device, FIG. 4 is a diagram showing another braking mechanism of the braking device, FIG. 5 is a diagram showing a configuration example of a conventional manual scanner, and FIG. 6 is a perspective view of the conventional manual scanner. , FIG. 7 is a time chart of the timing detector of FIG. 11.12: Time monitoring circuit, 13: Alarm drive circuit,
14: Braking unit drive circuit, 15: Display device, 16: Braking device, 31.45 Magnet, 6 rubber roller.

Claims (1)

[Claims] (1) A manual device that has a light source that irradiates light onto the document surface, a sensor that detects light reflected from the document surface and extracts image data, and a timing generator that generates synchronized timing for transferring the extracted image data. The type scanner is provided with a means for detecting the manual operation speed and a display means for displaying an alarm to the operator, and when the detection means detects a speed exceeding a predetermined value, the display means displays an alarm. Features a manual scanner.