JPS58166083A - Hammer alarm detecting method - Google Patents

Abstract

PURPOSE:To prevent erroneous printing, missing in printing, and damage of type wheels, in a type selecting type printer, by generating abnormal signals when a current is not flowed at the time the current should be flowed to a hammer solenoid and when the current is flowed during the nonconducting period. CONSTITUTION:When a printing timing control signal is sent to a control circuit 4 from a type selection control part 5 at the type selection, the control circuit 4 controls the ON and OFF of a hammer driving circuit 3, and the control is performed so that an exciting current is flowed to the solenoid 1. When a detected signal is sent from a current detecting part 2 before the type selection, the control circuit 4 makes an alarm generating circuit 8 generate an alarm signal and stops the type selection operation. The control is performed so as to turn OFF the exciting current to the solenoid 1. When the control is performed by the control circuit 4 so that the hammer driving circuit 3 is turned ON and the solenoid 1 is energized, but the current is not detected by the current detecting part 2, the alarm signal is generated by the same way.

Description

Detailed Description of the Invention (υ Technical Field of the Invention) The present invention relates to a hammer alarm detection method, and in particular to a type selection type printer, which can correctly detect an abnormal state of a type striking I/hammer and detect erroneous printing, omitted characters, and type wheel. This invention relates to a hammer alarm detection method that can reliably prevent the destruction of cast iron.

(RI GI2 US Technology and Problems) For example, type selection type serial printers use a magnet to print the selected type on paper, and when a current is applied to the solenoid to energize it, the hammer protrudes. Printing is performed by hitting the selected type at the same time. Therefore, if a failure occurs and current does not flow through this solenoid, incorrect printing or omissions will occur, so the failure condition will be detected correctly. For this reason, conventionally, the current flowing through the hammer solenoid was monitored, and an alarm was generated if the current did not flow at all or was abnormally large.

However, in such a type selection type serial printer, in order to select and print a type by rotating a petal-shaped type wheel, the striking pin of the hammer must be brought out to the east before the type wheel rotates. This may cause typographical errors or damage to the type wheel. Also, if the hammer solenoid tube is energized after type selection is completed, the hammer drive circuit may malfunction or fuse. If current does not flow to the hammer solenoid due to a break in the signal line, etc., it may cause omissions.

However, such failures cannot be detected accurately by simply detecting the presence or absence of the current flowing through the hammer solenoid, and the amount of current flowing through the hammer solenoid as described above. This may result in damage to the type wheel.

(3) Purpose of the invention The purpose of the present invention is to solve these problems.
Rather than simply monitoring the state of the current flowing through the hammer solenoid, it is possible to check whether current is flowing through the hammer solenoid when it should be flowing or whether current is flowing when it should not be flowing. An object of the present invention is to provide a hammer alarm detection method for accurately detecting the occurrence of a failure.

(4) Configuration of generator 11- To achieve this purpose, the hammer alarm detection method of the present invention detects the current flowing through the hammer solenoid and generates an alarm.
A current detecting means for detecting the current flowing through the hammer solenoid, an electrically conductive side means for reporting when current flows in the hammer solenoid and when no current flows, and an electrically conductive side signal transmitted from the electronic measuring means. It has an operation layer monitoring technique that generates an abnormal signal based on the current signal transmitted from the current detection means, and detects an abnormality when the current flowing through the hammer solenoid does not flow when it should be energized or flows during the non-energized period. It is characterized by generating a signal.

(5) Embodiment of the Invention An embodiment of the present invention will be explained based on Figures 1jII# and 22.

Figure 1 shows the configuration of one embodiment of the present invention, and Figure 02 shows its operation imfIm.

In the figure, l is a solenoid, 2. 3 is a current detection unit, 3 is a hammer drive path, 4 is a control circuit, 5 is a type selection control unit, 6 is a type selection circuit, and 7 is a digital/analog conversion unit (hereinafter referred to as D).
/A converter], 8 is an alarm generation circuit, and 9 is a fuse.

Solenoid l drives a hammer for a printer that strikes the type tube on the type wheel.

When this solenoid 1 is excited with a pulse current of a predetermined amplitude t, the hammer is driven and the printing tube is activated.

The current detection llI2 detects the current flowing through the solenoid 1, and outputs a pulse voltage corresponding to the magnitude t of the current only during the period when the current is flowing through the solenoid 1.

The hammer drive circuit 3 outputs a pulsed excitation current to the solenoid l in order to drive the hammer tube for the printer, and the large current value tr is an anada signal transmitted by the D/A converter 7. The output period of the excitation current is determined by the ON signal period transmitted from control-s4.

The control circuit 4 performs on/off control of the current flowing through the solenoid 1, and also monitors whether the current flowing through the solenoid 1 is in a normal state or not, and outputs an excitement detection signal to the alarm generation circuit 8 in the event of an abnormality. The fact that the current flowing through solenoid l is in an abnormal state means: ■ current is not flowing during the period when it should be flowing through solenoid l, and @ current is flowing during the period when current is not flowing through solenoid l. θ is abnormally large or abnormally small.

The type selection control section 5 performs control to select the special type to be printed and drive it to the hammer striking position, and also controls when the size of the type to be printed is small (for example, [
2 punctuation marks), the hammer is driven with a rather small current, and if the type is large, the hammer is driven with a rather large current.
drive the engine.

It controls each machine during printing to ensure uniform density printing and to avoid damaging the paper by hitting punctuation marks too strongly.

The type selection circuit 6 controls the type wheel so as to select the type to be printed based on the type signal transmitted from the type selection control section 5 and to bring the type to the position where it is to be struck by the hammer.

In order to control the driving force of the hammer, the D/A/R converter 7 outputs a 7-digit signal to the hammer drive circuit 3 to control the magnitude of its output current pulse, and also controls type selection. It converts the digital signal instructed from section 5 into an analog signal.

The alarm generating circuit 8 operates to generate an alarm when an abnormality detection signal is output from the Il control circuit 4, and outputs that an abnormal state has occurred.

The operation of the present invention will be explained with reference to FIG.

■ When the printer operates in the T1 diagram, the print timing control signal necessary to drive the hammer when the type selection is made is transmitted from the type selection control unit 5 to the control circuit 4, Based on this, the hammer drive circuit 3 is controlled to be turned off so that the excitation current flows through the solenoid l. Therefore, am control path 4
If the current detection signal is not transmitted from the current detection unit 2 and the solenoid l is not energized before type selection, it is a normal state, and therefore type selection control is executed.

■ However, before selecting type, the hammer drive circuit 3
If the current detection unit 2 detects that the solenoid L is energized even though the solenoid L is turned off, and transmits this to the control circuit 4, the control circuit 4 detects that a failure has occurred in the hammer drive circuit 3. It is determined that this has occurred, and an abnormality detection signal is output, causing the alarm generation circuit 8 to output an alarm signal. At this time, the control circuit 4 causes the character selection control circuit 5 to stop the character selection operation, and also controls to turn off the excitation current to the solenoid 1.

■ In addition, a print timing control signal indicating that the type selection control has been performed is transmitted from the type selection control section 5, which causes the control circuit 4 to turn on the 1-meter drive circuit 3 and cause the excitation current to flow through the solenoid l. At this time, if the current detection section 2 detects a current, it is determined that the current is normally flowing through the solenoid 1. The reason why the solenoid 1 is energized for a certain period of time is that the energizing current is turned off. The hammer is driven by the excitation of the solenoid l for a certain period of time, and predetermined printing is performed.

■ By the way, the control circuit 4 should turn on the hammer drive circuit 3 to energize the solenoid L (if the current detection section 2 does not detect a current even after controlling the hammer drive circuit 3, the control circuit 4 should turn on the hammer drive circuit 3 to energize the solenoid L). It is determined that there is a failure, a failure in the signal line, a disconnection in the solenoid l, or a disconnection in the fuse 9, and outputs an abnormality detection signal to cause the alarm generation circuit 8 to generate an alarm signal.Of course, at this time The control circuit 4 stops the character selection operation and also turns off the hammer drive circuit 3.

In the above description, a faulty layer is detected by detecting the presence or absence of current in the solenoid before and after selecting type, but it is also possible, of course, to determine a fault by detecting the magnitude of the current when current flows through the solenoid. It is something that can be added.

(6) Effects of the Invention According to the present invention, the same detection method can detect failure states in which current flows to the solenoid when it should not, and fault states in which current does not flow to the solenoid when it should. can do.

Therefore, it is possible to reliably prevent typographical errors due to failure of the hammer drive circuit, disconnection of signal lines, etc., prevent damage to the print wheel, and detect omitted characters.

[Brief explanation of drawings]

Figure 1 is a configuration diagram of an embodiment of the present invention, and Figure 2 is an explanation of its operation. In the figure, l is a solenoid, 2 is a current detection unit, 3 is a hammer drive circuit, 4 is a control circuit, 5 is a type selection control unit, 6 is a type selection circuit, 7 is a D/A conversion unit, and 8 is an alarm generation circuit. ,
9 each indicates a fuse. Patent Applicant Fujitsu Limited Attorney Akira Yamatani

Claims (1)

[Claims] (13) In the hammer alarm detection method that detects the current flowing through the hammer solenoid and generates an alarm, there is a current detection means that detects the current flowing through the hammer solenoid, and detects when the current m flows through the hammer solenoid and when it does not. energization prediction means for reporting, and operation state monitoring means for generating an abnormal signal based on the energization prediction signal transmitted from the electronic measurement means and the current signal transmitted from the current detection means, which flows to the hammer solenoid. The hammer alarm detection method is characterized by generating an abnormal signal when current does not flow when it should or flows during a non-current period.