JPS6153054A - Dot impact type printing apparatus - Google Patents

Abstract

PURPOSE:To prevent the decrease of the life of an ink ribbon and a dot head magnet respectively by controlling the length of a current flowing time to the dot head magnet with printing on a rather thick slip blank and a rather thin roll blank respectively. CONSTITUTION:A current flowing time to a dot head magnet is changed with a roll blank and a slip blank. That is, a high level output signal Sv is sent out from a slip blank detector 16, since the slip blank 8 is not set to a slip guide 7, when the printing to a receipt blank 3 and a jounal blank 4 is carried out, a transistor 24 is ON operation, the resistance value of a time constant circuit is made smaller than the series resistance value of resistances 22 and 25, and the time constance of monostable multivibrator is made smaller. Therefore, the current flowing time is shorten, and a suitable impact force is made. Moreover, the low level output signal Sv is sent out from the slip blank detector 16 and OFF action is operated by the transistor 24, when the slip blank is set to the slip guide 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dot impact printing device that prints by striking a dot head onto a sheet of paper via an ink ribbon.

[Prior Art] Conventional dot impact printing devices print on relatively thin roll paper such as receipt paper and journal paper, and on relatively thick slip paper such as authentication slips. Since the time during which the dot head magnet was energized during printing was the same, the impact force on the paper was always constant.

[Problems to be Solved by the Invention] For this reason, if the energization time is set based on printing on slip paper, clear printing can be made with a moderate impact force on slip paper, but there is no impact on roll paper. The force is too strong, which shortens the life of the ink ribbon, and the constant energization time causes severe wear on the dot head magnet, leading to a shortened lifespan.

Note that if the energization time is set based on printing on roll paper, the impact force when printing on slip paper is too weak and the printing becomes unclear, resulting in a problem that this method is rarely used.

This invention has been made in view of the above-mentioned problems, and it is possible to control the length of the current application time to the dot head magnet for printing on comparatively thick slip paper and printing on comparatively thin roll paper, thereby increasing the length of the ink ribbon. It is an object of the present invention to provide a dot impact type printing device which can prevent a reduction in the lifespan of a dot head magnet and a reduction in the lifespan of a dot head magnet.

[Means for Solving the Problems] The present invention selectively inks relatively thin roll paper such as receipt paper and journal paper and relatively thick slip paper such as authentication slips using an ink ribbon using a dot impact method. In the printing device that performs printing, there is a slip paper detector that detects the insertion set of slip paper, and a long oscillation time width is set in response to the slip paper detection output from this detector, and a slip paper non-detection output from this detector. It consists of a monostable multivibrator whose oscillation time width is set short and outputs a dot head magnet energization time signal corresponding to the set oscillation time width in response to the dot head drive signal. This allows the time for which electricity is applied to the dot head magnet to be varied.

[Function] With this configuration of the present invention, when relatively thick slip paper is inserted and set, the oscillation time width of the monostable multivibrator becomes longer, and the time for energizing the dot head magnet becomes longer. The dot head operates with a strong impact force, but when printing on roll paper without slip paper set, the oscillation time width of the monostable multivibrator becomes shorter and the time for energizing the dot head magnet becomes shorter, and the dot head produces a weaker impact force. It works.

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

FIG. 1 is a configuration diagram of the main parts, 1 is a platen, 2 is a pinch roller that pinches and sends the receipt paper 3 and journal paper 4, which are rolled paper, between the platen 1, and 5 is the receipt paper 3 and journal paper. This is a paper pan for sending out 4. 6 is a dot head mechanism arranged opposite to the platen 1; 7 is a slip guide interposed between the dot head mechanism 6 and the platen 1 and guides the slip paper 8; 9 is a ribbon cassette; 10 is a stamp;
11 is a stamp holder and 12 is a cutter. The dot head mechanism 6 is provided with a dot wire that performs an impact motion toward the platen 1, a dot head magnet that selectively moves the dot wire forward and backward, and the like. The dot head mechanism 6 and ribbon cassette 9
is mounted on a carrier 13, which is movable along a guide shaft 14,15. The slip paper 8 is attached to the tip of the slip guide 7.
A slip paper detector 16 is provided to detect the set state of the paper.

FIG. 2 shows the circuit configuration of a control section for controlling the energization time for the dot head magnet, and 21 is a commercially available linear IC (NE555), which is an IC for constructing a monostable multivibrator. Said linear IC21
is provided with a THR terminal, a DIS terminal, an OUT terminal, and a TRIG terminal, and the THR terminal and DIS terminal are connected, and the connection point between C (capacitor) and R (resistance) of the CR time constant circuit is connected to the connection point. By connecting, a rectangular wave signal with a time width to = 1.1XRo XC is output from the OUT terminal at the timing when a signal is input to the TRIG terminal. However, Ro is the resistance value of the resistor R, and C11 is the capacitance of the capacitor C. Specifically, a series circuit of a resistor 22 and a capacitor 23 is connected between the Vc terminal and the ground, and the connection point of the resistor 22 and capacitor 23 is connected to the linear IC.
The connection point between the THR terminal and the DIS terminal of No. 21 is connected. A PNP type transistor 24 is connected to the resistor 22.
A resistor 25 is connected in parallel through the resistor 25.

A resistor 2 is connected between the emitter and the base of the transistor 24.
6 is connected. The output signal Sv from the slip paper detector 16 is input to the base of the transistor 24 via an inverter 27 and a resistor 28. The output signal Sv is a signal that becomes low level when slip paper 8 is detected, and becomes high level when no slip paper 8 is detected. A signal Sin generated during printing operation is supplied to the TRIG terminal of the linear IC 21.

In the apparatus according to the embodiment of the present invention having such a configuration, when printing is performed on receipt paper 3 and journal paper 4 without printing on slip paper 8, slip paper 8 is not set in slip guide 7. Therefore, a high level output signal 3v is sent from the slip paper detector 16. Thus, the transistor 24 is turned on, and in this state, the resistance value of the time constant circuit becomes the resistance value of the parallel circuit of the resistor 22 and the resistor 25, and becomes small. In other words, the time constant of the monostable multivibrator becomes smaller. Therefore, in this state, as shown in FIG. 3, when the signal Sin is supplied to the TRIG terminal of the linear IC 21 during printing operation, the time width t2 is relatively short from the 0UTI terminal.
The rectangular wave signal S out2 is output, and the signal 3 o
The dot head magnet is energized by ut2.

However, the energization time of the dot head magnet at this time is shortened, and the impact force of the dot head on the paper is relatively weak, but the impact force on the receipt paper 3 and the journal paper 4 is moderate.

Furthermore, when the slip paper 8 is set on the slip guide 7 in order to perform printing on the slip paper 8, a low level output signal 3v is sent from the slip paper detector 16. Thus, the transistor 24 is in an off-operation, and in this state, the resistance value of the time constant circuit becomes the resistance value of the resistor 22 and becomes large. In other words, the time constant of the monostable multivibrator increases. Therefore, in this state, when the signal Sin is supplied to the TRIG terminal of the linear IC 21 during the printing operation as shown in FIG.
t1 is output, and the dot head magnet is energized by the signal S outl. However, the energization time of the dot head magnet at this time becomes long, and the impact force of the dot head on the paper is relatively strong, and the impact force on the slip paper 8 is moderate.

In this way, when printing on the receipt paper 3 and journal paper 4, the impact force is weakened, and when printing on the slip paper 8, the impact force is strengthened, so that printing is always performed with an impact force that matches the thickness of the paper. It can print clearly on any paper. In addition, the dot head magnet is energized for a long time only when printing on the slip paper 8, and is shortened when printing on the receipt paper 3 or journal paper 4, so the degree of wear of the dot head magnet is not so severe that there is a risk of shortening its life. There is no such thing.

Furthermore, since the impact force is weakened when printing on the receipt paper 3 or the journal paper 4, the ink ribbon is not worn out so much and there is no risk of shortening its life.

Next, another embodiment of the invention will be described with reference to the drawings.

Note that the same parts as in the above embodiment are given the same reference numerals, and detailed explanations will be omitted.

As shown in Figure 4, this uses a series circuit of resistors 29 and 30 as the resistance of the time constant circuit, and the resistor 3o is N
PN type transistors 31 are connected in parallel, and the base of the transistor 310 is connected to the inverter 27 via a resistor 32.
It is connected to the output terminal of , and further connected to the +VC terminal via a resistor 33. In this case, when the slip paper detector 16 detects the slip paper 8, it sends out a high level output signal 5V,
When not detected, a low-level output signal Sv is sent out, which is the opposite of the previous embodiment.

In this device, when the slip paper detector 16 detects the slip paper 8 and sends out a high level output signal of 3V, the transistor 31 is turned off and the resistance value of the time constant circuit is changed by the series circuit of the resistors 29 and 30. Increase the time constant. However, at this time, the time width of the signal 3out output from the OUT terminal of the linear IC 21 becomes longer, and the impact force of the dot head becomes stronger. Furthermore, when the slip paper detector 16 does not detect the slip paper 8 and sends out a low-level output signal Sv, the transistor 31 turns on and short-circuits the resistor 30, so that the resistance value of the time constant circuit is only the resistor 29. , and its time constant becomes smaller. However, at this time, the time width of the signal 5out output from the OUT terminal of the linear IC 21 becomes shorter, and the impact force of the dot head is weakened. In this way, also in this embodiment, when the slip paper 8 is set, the impact force of the dot head is strengthened, and when the slip paper 8 is not set and printing is performed on the receipt paper 3 or the journal paper 4, the impact force of the dot head is weakened. Therefore, in this case as well, the same effects as in the above embodiment can be obtained.

[Effects of the Invention] As described in detail above, according to the present invention, the length of the energization time to the dot helad magnet is controlled for printing on relatively thick slip paper and printing on relatively thin roll paper, and thereby It is possible to provide a dot impact type printing device that can prevent a decrease in the life of an ink ribbon and a decrease in the life of a dot rad magnet.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a main part showing an embodiment of the present invention, FIG. 2 is a circuit diagram of a main part of the same embodiment, and FIG. 3 is a diagram showing input and output signal waveforms of the monostable multivibrator shown in FIG. , FIG. 4 is a main circuit diagram showing another embodiment of the present invention. 3...Receipt paper, 4...Journal paper, 6.
...Dot head mechanism, 8...Slip paper, 9...
・Ribbon cassette, 16...Slip paper detector, 2
1... Trinia IC (NE555), 22
．． 25.29.30...Resistor, 23...Capacitor, 24.31...Transistor.

Claims (1)

[Claims] In a printing device that selectively prints on relatively thin roll paper such as receipt paper and journal paper, and relatively thick slip paper such as authentication slips using the dot impact method via an ink ribbon, the slip paper insertion set is used. The oscillation time width is set long in response to the slip paper detector and the slip paper detection output from this detector, and the oscillation time width is set short in response to the slip paper non-detection output. Consists of a monostable multivibrator that outputs a dot head magnet energization time signal corresponding to a set oscillation time width in response to a drive signal, and can vary the dot head magnet energization time depending on roll paper and slip paper. A dot impact printing device featuring: