JPS61175801A - Moving body runaway preventing device - Google Patents

Abstract

PURPOSE:To only execute an operation once again at the time of a malfunction of a control circuit, to eliminate to execute once again setting a moving body, and to execute very easily the recoverability by resetting automatically the control circuit by the second detecting means, in case the moving body has run away. CONSTITUTION:If a control circuit 201 containing a CPU becomes a runaway state due to noise, etc. in the course of its operation, it cannot receive a detecting signal of a read start position sensor 21 and a read end position sensor 22, therefore, it becomes impossible to transfer a normal signal (stop signal) to a motor driving circuit 200. As a result, a motor 18 rotates continuously, a light shielding plate 23 operates an abnormality detecting sensor 24 or 25, an abnormality detecting signal which has passed through an OR circuit 203 is inputted to a resetting circuit 204, and from the circuit 204, a reset signal is inputted to the circuit 201. When the reset signal is applied, the CPU in the inside of the circuit 201 executes its initializing once again.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention is used in an image reading device that scans and reads a moving body such as a microfilm image full-photodetector within a predetermined range. The present invention relates to a moving body runaway prevention device that prevents a moving body from running out of control.

(Prior Art) Conventionally, in order to increase the search speed of microfilm and efficiently search for a desired image, a movable object such as a photodetector scans the film image of the microfilm to read the image, and then an electric Image reading devices that convert signals into signals and store them on optical disks and the like are well known.

In this type of device, a detector for the moving body is provided at an image reading start position and a reading end position, respectively, and the drive of the moving body is controlled by signals from the detectors.

That is, when the moving object scans the image and reaches the image reading end position, the drive motor is stopped, reversed to return to the original image reading start position tlt, and when it reaches the reading start position (t), the drive motor is stopped. In addition, in order to prevent the moving object from running out of control without stopping at the reading start position or the reading end position, the reading position is set to be outside the movement range of the moving object at the reading start position and the weir end position. A limit switch, etc. was installed to open and close the drive circuit.In other words, when the moving object went out of control, the moving object switched the microswitch, cut off the motor drive circuit, and stopped the motor.
This prevents damage to the drive system due to runaway of the moving body, such as wire breakage when the moving body is wire-driven.

(Problem to be Solved by the Invention) However, in the case of such a conventional example, even if the CPU that controls the drive of the motor malfunctions due to noise etc., the moving object will run out of control and the motor will not be activated in order to switch the limit switch. will stop. In case of CPU malfunction, CPUt
- If you reset it and perform the operation again, it will operate normally, which is different from runaway caused by other causes such as a defect in the detector that detects the position of the moving object or a defect in the motor drive circuit. In the case of other causes, repair is required, but in the case of a CPU malfunction, it is only necessary to reset the CPU, which can be handled by the user. However, if the limit switch switches and the motor stops, the user must manually return the moving object to its original position, which is difficult for the user and requires specialized There was a problem in that it was inconvenient to have to call a service person.

The present invention has been made to solve the problems of the prior art, and its purpose is to distinguish between cases where a moving object runs out of control due to noise etc. and cases where it runs out of control due to other causes. An object of the present invention is to provide a runaway prevention device for a movable body that does not forcibly shut down a motor drive circuit when the vehicle runs out of control due to noise or the like.

(Means for Solving the Problems) Therefore, in order to achieve the above object, the mobile object runaway prevention device of the present invention includes a first detection means for detecting the stop position of the mobile object, and a first detection means for detecting the stop position of the mobile object. a second detection means that detects that the moving object has moved out of a predetermined movement range from the first detection means; and a second detection means that resets the drive control circuit of the moving object when the second detection means detects the moving object. and a reset means for outputting a reset signal.

(Example) The present invention will be explained below based on the illustrated example. Second
The figure shows a microfilm image reading device to which the moving object prevention device according to the fourth embodiment is applied.

As shown in Figure 2, the middle plate 2 is parallel to the bottom plate l of the main body of the device.
0, a microfilm retrieval means is fixed.

Furthermore, a lighting unit 5 consisting of a halogen lamp 2, a lens 3, and a mirror 4 is attached to the bottom plate 1.
The light flux illuminates the stage 6 on which the microfilm F retrieved through the 2°9 window in the middle plate is stopped. This illumination light flux forms an image on the pupil of the magnifying lens 7 in order to correct unevenness in light amount and improve efficiency. An image area of one frame of the illuminated microfilm F is imaged onto a one-dimensional sensor surface by a magnifying lens 7 and a mirror 9. The mirror 9 is supported by a support member (not shown) on the side plate of the retrieval means so as to be inclined at 45° with respect to the optical axis. The image forming surface of the microfilm F is formed. On this imaging plane is a one-dimensional sensor lO
are arranged so as to be able to scan the imaging plane along guide shafts 12 and 13 fixed to the back side plate 11 and arranged on the companion guide panel 19. This one-dimensional sensor 10 is fixed to a sensor carriage 14 as a movable body. The sensor carriage 14 is connected to a wire 17 that is passed around a drive motor pulley 15 fixed to a drive motor 18 and a fixed pulley 16 fixed to a guide panel 19, and the rotation of the drive motor 18 causes the guide shaft 12 and It is scanned back and forth along 13.

The image read by the one-dimensional sensor described above is output as a -'B fine copy image by a laser beam printer, an inkjet printer, or the like. The above-mentioned apparatus converts an image into an electrical signal, and is therefore effective in transmitting the image, storing it in a disk memory, etc., and performing image processing such as enlarging/reducing and editing.

Figure 1 shows a detailed diagram of the mobile object runaway prevention device.
The guide panel 19 is provided with a reading start position sensor 21 and a reading end position sensor 22 as first detection means for detecting a reading start position and a reading end position of an image. Each sensor 21, 22 uses a U-shaped interrack that integrates a light receiving element and a light emitting element, and a light shielding plate 23 attached to the sensor carriage 14 blocks the light from the light emitting element for detection. It has become.

Further, in order to detect abnormal driving of the sensor carriage 14, abnormality detection sensors 24 and 25 as second detection means are provided outside the reading start position sensor 21 and the reading end position sensor 22. This abnormality detection sensor 24, 25
Interac is also used.

Further, limit switches 26 and 27 for forcibly stopping the motor 18 are provided outside the abnormality detection sensors 24 and 25. The actuators of the limit switches 26 and 27 are pressed by the light shielding plate 23 described above to switch from on to off.

FIG. 3 shows a circuit diagram of the device of this embodiment. In the figure, 200 is a motor drive circuit to which the motor 18 is connected and a limit switch 26.
27 are connected in series. 201 is a control circuit, which includes a reading start position sensor 21 and a reading end position sensor 22.
A control signal for controlling the drive of the motor is output to the motor drive circuit 200 based on the detection signal from the motor drive circuit 200 . 20 more
2 is an abnormality detection circuit, which is connected to the abnormality detection sensors 24 and 25 via an OR circuit 203, and when either abnormality detection sensor 24 or 25 detects the sensor carriage 14, an abnormality detection signal is sent from the OR circuit 203. is input. Further, the OR circuit 203 is connected to the control circuit 201 via a reset circuit 204, and is configured to input a reset signal to the control circuit 201 when an abnormality detection signal is input. The abnormality detection circuit 202 is also connected to limit switches 26.27.
27 is forcibly turned off, the abnormality detection circuit 202
It is designed to block. Note that 205 is an operation panel, which is connected to the control circuit 201 as well as the abnormality detection circuit 2.
02 so that when an abnormality is detected, it is displayed that there is an abnormality.

Next, the operation will be explained according to the flowcharts shown in FIGS. 4 and 5. When reading an image, the sensor carriage 14 is first moved to the reading start position (STEPI).
. FIG. 5 shows a detailed diagram of the initial setting, and first the motor 18 is stopped (STEP 2t). Next, it is determined whether the reading start position sensor 21 or the reading end position sensor 22 is on (STEP 22). Sensor is off and 6
The fid motor 18 is reversed (STEP 23). However, the direction in which the motor 18 rotates is normal and reverse in the direction in which the sensor carriage 14t moves toward the reading end position.

Next, it is determined whether the reading start position sensor 21 is on (STEP 24). If the reading start position sensor 21 is not on, the motor 18f is stopped (STEP 25).

If the sensor is on in 5TEP22, it is determined whether the reading start position sensor 21 is on (STE
P26). If the sensor is on, proceed to 5TEP25.

If the reading start position sensor 21 is not turned on at 5TEP24, the process returns to 5TEP23 and the reading start position sensor 21 is turned on.
Rotate the motor 18 in reverse until it turns on.

When the initial settings are completed, the process proceeds to 5TEP2, and it is determined whether there is a reading start command from the operation panel.

If there is no command to start reading, it waits. When there is a command to start reading, the process advances to 5TEP3 and the motor I8 is rotated in the normal direction to move the sensor carriage 14 forward and perform image scanning ft-. Next 5TE
Proceeding to P4, it is determined whether the reading end position sensor 22 is on or not. That is, the motor 18 is rotated forward until the reading end position sensor 22 is turned on, and when the sensor carriage 14 turns on the reading end position sensor 22, the motor 18 is stopped (STEP 5). The stop of the motor 18 may be delayed by a timer after the reading end position sensor 22 is turned on. After stopping the motor 18,
That is, after the image reading is completed, the motor 18 is reversed to return the sensor carriage 14 to its original position (STEP 6). Furthermore, it is determined whether the sensor carriage 14 has reached the reading start position sensor 21, that is, whether the reading start position sensor 21 is turned on (STEP 7). When the reading start position sensor 21 turns on, the motor 18 is stopped (ST
EP8). After the motor 18 stops, the initial settings are returned.

If the control circuit 201 including the CPU goes out of control due to noise or the like during operation, the reading start position sensor 21
Since it becomes impossible to receive the detection signal from the reading end position sensor 22, it becomes impossible to transmit a normal signal (stop signal) to the motor drive circuit 200. Then, the motor 18 continues to rotate, the light shielding plate 23 operates the abnormality detection sensor 24 or 25t-, and the OR circuit 203t-
The passed abnormality detection signal is input to the reset circuit 204,
The reset signal is sent from the reset circuit 204 to the control circuit 201.
(STEP 9). When the reset signal is applied, the CPU inside the control circuit 201 is reset from the initial settings (STEPIO).

The abnormality detection signal is generated by a reset circuit 204 consisting of a mono multi-IC, etc., at the rising edge from 0 to 1 as shown in FIG.
01 is converted into a pulse of time t, which prevents the control circuit 201 from being permanently in the reset state.

Note that whether or not there is an abnormality is displayed on the operation panel 205 by the abnormality detection circuit 202.

In this embodiment, the case where it is applied to a microfilm image reading device has been described, but it can be applied to any drive device in which a moving body is reciprocated within a predetermined range.
The present invention can also be applied to a runaway prevention device for a scanning mirror in an optical system of an electrophotographic copying machine, a reading head for an optical disk, etc. as a moving object.

(Effects of the Invention) The present invention has the above-described configuration and operation, and since the control circuit is automatically reset by the second detection means when the moving object goes out of control, in the case of a malfunction of the control circuit, , the user only has to redo the operation, eliminating the need to reset the moving object as in the past, and making repairs extremely easy.

[Brief explanation of drawings]

FIG. 1 is a schematic perspective view of the main parts of an image reading device to which a moving object runaway prevention device according to an embodiment of the present invention is applied, FIG. 2 is a schematic overall perspective view of the device shown in FIG. 1, and FIG. Fig. 2 is a circuit diagram of the device, Fig. 4 is a 70-chart for drive control of a moving body,
Figure 5 is a flowchart of the initial settings in Figure 4, and Figure 6 (
A), (B), and (C) are explanatory diagrams of input and output signals of the reset circuit of FIG. 3. Explanation of symbols 14...Sensor carriage (movable body) 18...Motor 21...Reading start position sensor (first detection means) 22
...reading end position sensor (first detection means) 24,
25... Abnormality detection sensor (second detection means) 26,
27...Limit switch 201...Control circuit agent Patent attorney Kazunobu Sera (l) 3rd
Figure I8 Figure 4

Claims (1)

[Claims] In a drive device that reciprocates a movable body within a predetermined range, a first detection means for detecting a stop position of the movable body;
a second detection means for detecting that the movable body has moved out of a predetermined movement range of the movable body from the first detection means; and when the second detection means detects the movable body, the movable body moves. A moving object runaway prevention device comprising: a reset means for outputting a reset signal for resetting a drive control circuit of the moving object.