JPS61251268A - Alarm circuit - Google Patents

Abstract

PURPOSE:To recognize an abnormality easily by an operator even when a power source is broken after the abnormality in a moving condition of a moving material to be detected by adding a power source monitor means, an unvolatile memory means capable of electrically writing and a control means. CONSTITUTION:Before an operator recognizes an abnormality, when a power source is broken by any reason, an alternating current power source monitor circuit 1 generates a power source breaking signal of 'yes' and informs to a control circuit 5 that the power source is broken. The control circuit 5 designates a memory circuit 3 to write an abnormal signal. The processing is performed within a time after a power source breaking signal E goes to 'yes' until a secondary side direct current power of a facsimile equipment is extinguished and which is determined by a time constant of a power source rectifier circuit. When the power source is closed again, the control circuit 5 designates to read the abnormal signal stored in the memory circuit 3 in accordance with with the power source breaking signal E of 'low', and the read abnormal signal is transferred to a display circuit 4 and the contents of the abnormality is displayed again.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an alarm circuit, and more particularly to an alarm circuit for detecting and displaying an abnormality in the moving state of an object in a facsimile machine.

[Conventional technology]

? In the axis device, in order to detect abnormalities in the movement state of moving objects such as originals and recording paper, passage detection such as optical sensors are installed at at least two locations in the paper transport path, the paper introduction section and the paper ejection section. A device is installed to measure the time interval of paper passing signals from each passing detector, and when the measured value exceeds a preset time, it is detected as an abnormality such as a paper jam or a stoppage of paper, and the display is displayed. The details of the abnormality are displayed to alert the operator.

On the other hand, even when sending, if there are many originals to be sent, the operator places the originals in the automatic paper feeder and performs the sending operation.-1 After confirming that the transmission has started, the operator leaves the facsimile machine and performs daily work. is normal.

K while the operator is away from the facsimile machine.

After a jam or running stop occurs and an abnormality is detected,
If the power to the facsimile machine is cut off for some reason, the information about the detected abnormality will disappear, and when the power is restored, even though the cause of the abnormality has not been removed,
Since no abnormality is displayed, the operator cannot tell that there is an abnormality.

[Problem that the invention seeks to solve]

In other words, when conventional alarm circuits monitor dynamic state changes to detect an abnormality in the moving state of a moving object by measuring the time it takes to move between at least two passing detectors, it is difficult to detect an abnormality. If the power is turned off after the power is turned off, there is a drawback that it will not be possible to indicate that an abnormality has occurred when the power is turned on again.

[Means for solving problems]

The alarm circuit of the present invention includes a power supply monitoring means that outputs a power-off signal that is generated when the primary power of the device is cut off and disappears when it is turned on again, and a power supply monitoring means that outputs a power-off signal that is generated when the primary side power of the device is cut off and disappears when the device is turned on again. an abnormality detection means that generates a signal; a storage means that stores the abnormal signal and is electrically writable without being erased in a power-off state; and a display means that displays abnormality contents in response to the abnormal signal; When a power-off signal is generated after the occurrence of an abnormal signal, write control of the abnormal signal to the storage means is performed while the secondary power of the device remains, and when the power-off signal disappears, read control and transfer to the display means are performed. and control means for performing control.

〔Example〕

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

FIG. 1 is a block diagram showing an embodiment of the present invention, and the alarm circuit includes an AC power supply monitoring circuit 1, an abnormality detection circuit 2, a memory circuit 3, a display circuit 4, and a control circuit 5.

In FIG. 1, an AC power supply monitoring circuit l is provided on the input side of a commercial AC power supply (hereinafter referred to as a power supply) to the facsimile machine, and constantly monitors the power supply status to the facsimile machine to prevent power failure. It generates a power-off signal E that is "high" when the power is connected, and "low" when the power is connected.

The abnormality detection circuit 2 includes an abnormality signal generation circuit 21 and two passage detectors 22 and 23, as shown in FIG. FIG. 2 shows a case where an abnormality in document running is detected. When a plurality of documents are loaded into the automatic grinding unit 6 and transmission is started, the documents are fed out one by one, and each document is fed out by a pair of rollers 8 and 9, the document is conveyed along a document conveyance path C shown by a dashed dotted line, and is discharged to the outside of the apparatus.

During the conveyance process, when the leading edge of the document reaches the document introduction section AK, the passage detector 22 detects the document and sends a passage signal 221.
occurs. Next, the manuscript is read by the reading section 7, and then
When the trailing edge of the document passes through the document discharge section B, the passage detector 2
3 detects the trailing edge of the document and generates a passing signal 231. Note that the reading unit 7 uses a light source 71. It is equipped with a lens 72 and a one-dimensional image sensor 73, and outputs an image signal according to the shading information on the document.

The abnormal signal generation circuit 21 includes a counter and a data transmitter.

A setting value corresponding to a predetermined time length is set in advance in the counter, and when the passing signal 221 is supplied, counting of the time clock is started, and when the passing signal 231 is supplied, the counter is set to an initial value. However, the predetermined length of time is the time -t'', which is the time period for the document to pass from the document introducing section A to the document discharging section B plus the margin.

If the cuff count exceeds the set value before the passing signal 231 is supplied, a count over pulse is generated. This indicates that the document is abnormally stopped (for example, jammed) between the document introduction section A and the document discharge section B for some reason.

The data oscillator is a circuit that generates predetermined code data for displaying the content of the abnormality, and holds the count-over pulse from the counter, and also outputs the predetermined code data as an abnormal signal and supplies it to the control circuit 5.

In FIG. 1, when the control circuit 5 receives an abnormal signal,
This is transferred to the display circuit 4, and the display circuit 4 displays the details of the abnormality on the display.

Now, suppose that the power is cut off for some reason before the operator confirms that there is an abnormality. AC power supply monitoring circuit 1 is “high”
A power-off signal is generated to notify the control circuit 5 that the power has been turned off.

When the power-off signal E becomes "no-y", the control circuit 5
Abnormality confirmation signal F for checking whether there is an abnormality in the abnormality detection circuit 2
'i is supplied, and if the abnormality detection circuit 2 has detected an abnormality by the time it receives the abnormality confirmation signal F (a count over pulse has occurred), it supplies an abnormality signal to the control circuit 5.

The control circuit 5 instructs the storage circuit 3 to write the received abnormal signal. The memory circuit 3 is a memory element (for example, E"F ROM) whose memory contents are not lost even in a power-off state and can be written and erased electrically. The control circuit 5 performs the above processing when the power-off signal E is activated. This is executed within the time determined by the time constant of the power supply rectifier circuit after the "high" K is turned on until the secondary DC power of the facsimile machine disappears.

When the secondary DC power disappears, the abnormality detection circuit 2 and the display circuit 4 return to their initial states, and the detected abnormality information is erased. When the power is turned on again, the control circuit 5 becomes "low"
In response to the power-off signal E, an instruction is given to read out the abnormal signal stored in the memory circuit 3, and the read abnormal signal is displayed on the display circuit 4.
The error details will be displayed again. Display circuit 4 and memory port i! ! 3 is set to the initial state when the operator resets the alarm.

It should be noted that the control circuit 5 can be easily realized by being configured with a one-chip microprocessor, which is a low-speed processing and low-cost logic element, and processing with its software.

〔Effect of the invention〕

As described above, the alarm circuit of the present invention detects an abnormality in the movement state of a moving object by adding a power supply monitoring means, an electrically writable nonvolatile memory means, and a control means. Only when there is a power outage after that, the abnormality information is stored in the storage means while the secondary DC power remains, and when the power is turned on again, the abnormality information is read out from the storage means and displayed. Even if an error occurs, the operator can easily recognize that there is an abnormality, which enables appropriate accident handling, improves operability, and simplifies the control steps for memory control.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of the present invention, and FIG. 2 is an explanatory diagram showing an example of abnormality detection according to the present invention. In the figure, 1... AC power supply monitoring circuit, 2...
--- Abnormality detection circuit, 3... Memory circuit, 4.
... Display circuit, 5 ... Control circuit. Shiba 1 Shizuku 2

Claims (1)

[Claims] A power supply monitoring means that outputs a power-off signal that is generated when the device's primary power is turned off and disappears when it is turned on again; and an abnormality detection means that monitors the moving state of the object and generates an abnormality signal when an abnormality is detected. a storage means for storing the abnormal signal, the storage contents of which do not disappear in a power-off state and are electrically writable; a display means for displaying the abnormal contents in response to the abnormal signal; When the power-off signal is generated, the abnormal signal is controlled to be written to the storage means while the secondary side power of the device remains, and when the power-off signal disappears, readout control and transfer control to the display means are performed. An alarm circuit comprising control means for performing the following.