JPH0427032B2 - - Google Patents

Description

[Detailed description of the invention]

INDUSTRIAL APPLICATION FIELD The present invention relates to a band-type line printer with improved printing quality. Prior Art As shown in FIG. 6, a conventional band-type line printer runs an endless band 3 on which type 2 is formed on the upper surface over a platen 1, and overlays a ribbon 4 and paper 5 on top of the type 2. The paper 5 is moved perpendicularly to the band 3, and the hammer coils 7 respectively provided in the plurality of hammers 6 arranged to face the printed characters of the band 3 are driven. When the desired type 2 arrives at a predetermined position, the magnet 7 is driven to apply impact energy to the hammer 6 to print. Note that the hammer 6 arranged on the band 3
For example, 136 are provided. The letters of the endless band 3 which move in one direction in front of the row of hammers are arranged out of alignment with the spacing of the hammers so that a predetermined number of letters are simultaneously opposed to the hammers in each row. By the way, the circuit that drives this hammer 6 is connected to the terminal D of the D flip-flop 8 as shown in FIG.
Hammer drive data (HDDA) is input to terminal CK, hammer set pulse (HSP) is input to terminal CK, hammer reset pulse (HRP) is input to reset terminal RE, and further to set terminal (SET) via resistor _R1 . The logic circuit power supply voltage Vcc is connected to the terminal. An output terminal Q of this D flip-flop 8 is connected to a strobe terminal of a comparator 9, and a reference voltage V _R for the hammer drive current is input to the positive terminal of the comparator 9.
The output of the comparator 9 is input to the base of a transistor 10, and the collector of this transistor 10 is connected via the hammer coil 7 to the hammer driving power supply voltage _VH . Also transistor 1
The emitter of 0 is connected to the ground via a resistor R ₂ and also to the negative terminal of the comparator 9, forming a constant current circuit. Conventional band-type line printers configured in this way use hammer drive data (HDDA)
When the hammer set pulse (HSP) occurs, the D flip-flop 8 is set, and when the hammer set pulse (HSP) occurs next, a strobe is input from the output terminal Q of the D flip-flop 8 to the comparator 9. At that time, the comparator 9 outputs a voltage to the base of the transistor 10, and the transistor 10 is turned on, causing current to flow through the hammer coil 7, but the voltage at the negative terminal of the comparator 9 reaches the reference voltage V _R connected to the positive terminal. Currents having the same value flow, the hammer 6 is driven, and the paper 5 is printed. The impact energy of the hammer 6 is small when there is only one piece, and large when there are six pieces, for example, using a copy adjustment that is provided to change the reference voltage V _R for the hammer drive current input to the comparator 9. By moving the copy adjustment knob according to the number of copies of paper 5,
A certain amount of energy is applied from the hammer coil 7 to the hammer 6, respectively. Problems to be Solved by the Invention However, in general, when comparing the surface area of printed characters "." and "M", it is clear that the surface area of "." is smaller, that of "M" is larger, and that of other printed characters. Although the impact energy varies depending on the number of copies, the impact energy during printing is constant, so for large area characters, the impact energy per unit area changes. becomes smaller, so
There was a problem in that the printing became thinner and the impact energy per unit area became larger for small-area characters, so there was a tendency for holes to form in the paper. Means for Solving the Problems In order to solve the above-mentioned problems, the present invention arranges a ribbon on the upper surface of the printing type of an endless band provided with a large number of running printing characters, and crosses the ribbon perpendicularly to the above-mentioned band on the upper surface of the ribbon. In a band-type line printer, a paper is sent to a predetermined position on the paper, and the desired type that has traveled to a predetermined position on the paper is struck by one or more of a number of hammers to print on the paper. The hammer is characterized in that the typefaces that can be hit are arranged in groups of approximately the same area, and the hammer is driven with impact energy set for each group of typefaces. Effect According to the present invention, type is divided into a plurality of groups according to its surface area, for example three groups, large, medium, and small, and the characters in each group are placed in positions where they can be struck simultaneously with a hammer. The positions are shifted and arranged for each group, and the impact energy is changed for each group to print. Embodiment FIG. 1 is a diagram showing an arrangement of hammers for explaining the principle of the present invention, and the hammer 6 is, for example,
There are 136 pieces, and on endless band 3 there are 128 pieces.
One set or a plurality of sets of examples of printed characters each having one set of 5 printed characters are arranged. The arrangement intervals of the letters and hammers are staggered so that a predetermined number of letters out of the 128 letters are opposed to a predetermined number of hammers of the hammer 6 at the same time. For example, as shown in the table, when the first timing pulse is issued, every eighth character 11 ₁ , 11 ₉ , 11
₁₇ , ......, 11 ₁₁₃ , 11 ₁₂₁ 16 pieces are every 9th hammer 6 ₁ , 6 ₁₀ , 6 ₁₉ , ......, 6 ₁₂₇ , 6
₁₃₆ and can be printed. Then, the printed characters 11 ₁ , corresponding to these first timing pulses are
11 ₉ , 11 ₁₇ , ......, 11 ₁₁₃ , 11 ₁₂₁ are all small-area characters like "''" and "'", and are opposed to the hammer at the second and third timing pulses. 11 ₂ , 11 ₁₀ , 11
₁₈ , ......, 11 ₁₂₂ and 11 ₃ , 11 ₁₁ , 11 ₁₉ ,
......, 11 ₁₂₃ is a large typeface,
The printed characters corresponding to the fourth to eighth timing pulses have a medium area.

[Table] With this arrangement, when the timing pulse is input, the hammers will be 6 ₁ , 6 ₁₀ ,
......, 6 ₁₃₆ , or all of them are simultaneously driven with small impact energy, and when a timing pulse is input, the opposing hammers 11 ₂ , 11 ₁₀ , ......, 11 ₁₁₄ Any one of 6 ₂ , 6 ₁₁ , 6 ₁₂₈
One or more or all of them are simultaneously driven with large impact energy. Note that the number of large-area print characters is about twice the number of small-area print characters, so when the timing pulse is input, the large-area print characters 11 ₃ , 11 ₁₁ , ......, 11 ₁₁₅
The hammers 6 ₃ , 6 ₁₂ , ..., 6 ₁₂₉ facing each other are driven with a large amount of energy. Also, when the timing pulse ~ is input, the other hammers 6
is driven by intermediate energy. FIG. 2 is a circuit diagram of a hammer drive circuit according to an embodiment of the present invention, in which 7 is a hammer coil, 9 is a comparator, and 10 is a transistor, and this constant current circuit is the same as the conventional example shown in FIG. 7 above. However, in this embodiment, the analog switches 12 ₁ , 12 ₂ , 12 ₃ are connected to the positive terminal of the comparator 9, and the analog switch 12 ₁ receives the voltage V _L applied to the large area type.
is input, and the voltage V _M applied to the medium area type is input to the analog switch 12 ₂ , and the voltage V _S applied to the small area type is input to the analog switch 12 ₃ .
are input respectively. Also, in order to drive these analog switches 12 ₁ , 12 ₂ , 12 ₃ ,
Signals L(N), M(N), and S(N) are input, respectively. It is also connected to the strobe terminal of the same comparator 9 through an OR gate 17. FIG. 3 is a circuit diagram of a signal circuit for outputting a signal S(N) for driving a small-area type according to an embodiment of the present invention. A pulse is input, hammer drive data (HDDA) is input to terminal CK, hammer reset pulse (HRP) is input to reset terminal RE, and logic circuit power supply voltage Vcc is input to set terminal SET via resistor _R3 . has been done. The output terminal Q of this D flip-flop 13 is connected to the output terminal Q of the D flip-flop 13.
It is connected to terminal D of 4. In addition, a hammer set pulse (HSP) is input to the terminal CK of the D flip-flop 14, a hammer reset pulse (HRP) is input to the reset terminal RE, and the logic circuit power supply voltage Vcc is input to the set terminal SET via the resistor _R3 . and the signal S(N) is output from the output terminal Q.
is output. FIG. 4 is a circuit diagram of a signal circuit for outputting a signal M(N) for driving a medium area type according to an embodiment of the present invention, in which D flip-flops 13 and 14 and the signals input thereto are the same. , in this circuit, a timing pulse ~ is input to the terminal D via the OR gate 15. FIG. 5 is a circuit diagram of a signal circuit for outputting a signal L(N) for driving a large area type according to an embodiment of the present invention, in which the D flip-flops 13 and 14 and the signals input thereto are the same. In this circuit, a timing pulse is input to the terminal D via the OR gate 16. Next, the operation of the signal circuit shown in FIG. 3 of the present invention will be explained. First, when a timing pulse is input, the print data from the user system and the character band data of the line printer are compared, and when hammer drive data (HDDA) is generated, the D flip-flop 13 is set. Next, hammer set pulse (HSP)
When the hammer reset pulse (HRP) arrives, the D flip-flop 14 is set and the signal S(N) is generated from the output terminal Q.
(N) continues to occur. When this signal S(N) is generated, the analog switch ₁₂₃ of the hammer drive circuit shown in FIG. 2 is turned on, and a drive current corresponding to small area type is applied to the hammer coil 7. Next, when a hammer reset pulse (HRP) is input to each terminal RE, the D flip-flops 13 and 14 are cleared, the signal S(N) disappears, and the analog switch ₁₂₃ is also turned off.
Hammer drive current is cut off. Similarly, in the signal circuit of FIG.
(N) is produced by the timing pulse ~,
Also in FIG. 5, the signal L(N) is produced by a timing pulse. In this way, the printed characters divided into groups by their respective timing pulses are
Since printing can be performed by changing the impact energy, printing can be performed with a constant printing pressure, thus improving printing quality. Effects of the Invention As is clear from the above explanation, the present invention can change the impact energy given to the hammer according to the size of the surface area of the type, so it is possible to reduce the variation in printing pressure, and the printing This has the advantage that quality can be improved.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram for explaining the principle of the present invention, FIG. 2 is a circuit diagram of a hammer drive circuit according to an embodiment of the present invention, and FIGS. 3 to 5 are circuit diagrams of a signal circuit of the present invention. FIG. 6 is a schematic diagram of a part of a band-type line printer, and FIG. 7 is a circuit diagram of a conventional hammer drive circuit. 1... Frame, 2... Type, 3... Endless band, 4... Ribbon, 5... Paper, 6... Hammer, 7... Hammer coil, 9... Operational amplifier, 10... Transistor, 11... Print, 12
...Analog switch, 13,14...D flip-flop.

Claims (1)

[Scope of Claims] 1. A ribbon 4 is arranged on the upper surface of the type of an endless band 3 provided with a large number of traveling type characters, and a paper 5 is fed perpendicularly to the band on the upper surface of the ribbon, and a predetermined portion of the paper is conveyed. This is a band-type line printer that prints on the paper by hitting the desired type that has traveled to the position with opposing hammers 6, and the arrangement spacing of the hammers and type are adjusted so that a plurality of types each face the hammer separately for each predetermined number. In the case where the arrangement intervals are staggered, the above-mentioned band is set so that the typefaces that can be struck simultaneously by the plurality of hammers facing each other form a group of approximately the same area and are arranged in a predetermined order, and the band corresponds to each type group. a plurality of setting circuits V _L , V _M , V _S that set the amount of electricity to generate the impact energy; and a circuit 12 ₁ to select one of the plurality of setting circuits according to the arrangement order of each type group. 12 ₃ ,
L(N), M(N), S(N)), and a band type line printer characterized in that the hammer is driven by impact energy set for each type group.