JPS6323164Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a drive circuit for an electronic typewriter, and more specifically, to a drive circuit for an electronic typewriter equipped with a serial printer in which a type carrier on which type is formed in multiple stages can be rotated and shifted up and down. This is because if there are no consecutive key input signals within a certain period of time, the type carrier is selected to the lowest visible position, the motor for driving the serial printer is stopped, and the operator The purpose of this invention is to allow easy confirmation of printed data on paper immediately after printing, and to reduce power consumption and prevent noise generation by stopping the motor. Another object of the present invention is to make it possible to vary the time from when the key input signal is interrupted until the motor is stopped, depending on the skill of the operator.

In an electronic typewriter, the printer motor is started by turning on the main power supply or by the first key input signal, and after the motor has started up to steady rotation, the desired symbol is printed on the paper based on the key input signal. It's becoming like that. In order to improve the printing speed, the motor continues to rotate at a steady speed regardless of the presence or absence of continuous key input signals, and maintains a standby state in which printing can be performed immediately even when there is no key input signal. This configuration is not too disadvantageous in terms of power consumption in an electronic typewriter installed in an office that uses a commercial power source, for example, but in a portable battery-powered electronic typewriter, the power consumption increases and the battery lifespan increases. significantly reduced.

The present invention has been developed in view of the above points, and provides a drive circuit suitable for use in a battery-powered electronic typewriter equipped with a serial printer in which visible positions can be selected by shifting the type wheel up and down. Hereinafter, the details of the present invention will be explained with reference to an illustrated embodiment.

FIG. 1 is a schematic perspective view showing an example of a serial printer P used in an electronic typewriter according to the present invention. In the figure, 1A and 1B are side frames that form part of the frame of the printer, and a carriage C is movably installed on two guide shafts 2 and 3 that span between the side frames 1A and 1B. There is. 4 is a type carrier mounted on the above-mentioned carriage C so as to be rotatable and shiftable up and down, consisting of an assembly of disc-shaped type wheels stacked in four stages, and a total of 96 symbols are formed on its outer periphery. It has been done. The carriage C includes:
A plurality of rotating shafts are inserted through the shaft, and each of these rotating shafts is connected to each rotating body in the carriage C by a spline connection (a connection that allows them to rotate together but to be able to slide freely on the shaft). That is, a shift cam 6 in a carriage C is spline-coupled to the shift shaft 5, and a shift lever 7 engaged with a cam groove 6a of the shift cam 6 rotates around a support shaft 8, thereby moving the type carrier 4 around the shaft. The supported holder 9 moves up and down to select the shift position of the type carrier 4. A gear 11 in a carriage C is spline-coupled to the type selection shaft 10, and as the gear 12 meshes with the gear 11, it is spline-coupled to the central axis of the gear 12 via an Oldham joint or the like. The type carrier 4 rotates, and the rotating position of the type carrier 4 is selected (type selection). Further, a hammer drive/carry cam 14 in the carriage C is spline-coupled to the hammer drive/carry shaft 13, and the hammer drive/carry cam 14 is spline-coupled to the hammer drive/carry shaft 13. The hammer drive cam of the raising cam 14 drives the hammer 15 which is pivotally supported by the carriage C, and selectively moves the desired type wheel in the type carrier 4 which has been selected and stopped at the desired shift position and rotation position to move the paper. Ink is applied by an ink roller 17 to a type carrier 4 held by a platen 16 (not shown) and pressed against it for printing. Then, in the second half of one rotation of the hammer drive/carry shaft 13, the carry cam (half circumferential screw-shaped tooth portion) of the hammer drive/carry cam 14 moves one pitch along the rack 18. Accordingly, a carry operation of the carriage C is performed.

The shift shaft 5, the type selection shaft 10, and the hammer drive/carry shaft 13 each protrude by a predetermined amount to the outside of the side frame 1A, and a rotation transmission/control unit is compactly attached to the outside of the side frame 1A. Connected to M. The rotation transmission/control unit M includes a gear train, a cam group, a clutch group, an electromagnet, etc., and selectively controls the rotation of the DC motor 19, which always rotates in one direction, in response to a print start command. Axis 5, 1
0,13. Reference numeral 20 denotes a dry battery which serves as a driving power source for the electric typewriter, and the above-mentioned DC motor 19, electromagnet, etc. are of course driven by this battery.

In the above configuration, when the DC motor 19 starts rotating based on a printing command, first the character selection shaft 10
At the same time, the shift shaft 5 rotates, and both shafts 5, 10
As soon as the rotational transmission between the drive shaft 13 and the DC motor 19 is interrupted by the clutch, that is, as soon as the shift selection and the rotation selection of the type carrier 4 are completed, the hammer drive/carry shaft 13 and the DC motor 19 is connected by a clutch, and the shaft 13 rotates once, and the hammer drive (printing operation) and the subsequent carry operation of the carriage C are performed. When this is completed, the hammer drive/carry shaft 13 is rotated. It automatically stops (the connection with the motor is cut off) and shifts the shift shaft 5 again.
At the same time, the type selection shaft 10 begins to rotate. That is, unless there is a motor stop signal, the DC motor 19 is configured to continue rotating at all times. The continuous shift selection, rotation selection, printing, and carry operations for each digit are performed by turning on and off the clutch based on the combined output of the cam group and electromagnetic control.

The shift position of the type carrier 4 can be selected in five stages, and there are four shift positions in which the four type wheels face the striking surfaces of the hammers 15, respectively, and four shift positions in which the type carrier 4 is located at the lowest stage. It is possible to select a visible position (visible position) for each type wheel that does not face the striking surface of the hammer 15, and the type carrier 4 is placed in the visible position.
When positioned, the operator can easily see the data on the paper immediately after printing.
Further, by the combined output of the cam group by selecting the visible position of the type carrier 4 and a plurality of specific rotation stop positions of the type carrier 4,
Carriage C return, carriage C spacing, back spacing, and paper feeding operations are performed respectively, and when continuous operation is required, the DC motor 19 is operated even when the type carrier 4 is in the visible position. It is configured to rotate continuously. Further, the shift position of the type carrier 4 is detected by a detection disc 21 fixed to the shift shaft 5.
Detection pulses for visible positions, which are rotation reference positions, and timing pulses corresponding to each shift position are output. The rotational position of the type selection shaft 10 and the rotational position of the type carrier 4 can also be detected.
Similarly, a detector 26 consisting of a detection disc 24 fixed to the type selection shaft 10 and a corresponding photo sensor 25 outputs a detection signal of the rotation reference position and the rotation position corresponding to each type. It's summery.

In addition, the rotation transmission/control unit M, the carriage C
Since the details of the peripheral structure are not directly related to the present invention, further explanation will be omitted, but if necessary, please refer to Japanese Patent Application No. 123040 filed earlier by the applicant of the present invention.

Figure 2 shows the serial printer S shown in Figure 1 above.
1 shows a drive circuit for an electronic typewriter equipped with an electronic typewriter.

In the figure, a keyboard 30 (key input means) has a print symbol input key, a carriage space key, a carriage backspace key, a carriage return key, a paper feed key, etc. Pressing down causes the serial printer P to perform various necessary operations, and key input signals from the keyboard 30 are encoded by the encoder 31 and input to the key input register 32. The key input register 3
2 temporarily stores key input signals and sequentially outputs command signals for printer operation at timings that match the control system at the subsequent stage.

33 is a timer (timer means) which determines whether or not the key input signals from the keyboard 30 are continuous within a certain period of time, and is set at the first key input signal after the main power is turned on, and a predetermined timer is used. As long as there is a continuous key input signal within the predetermined time (width), the set state is maintained and the set signal _S1 is output; on the other hand, when there is no key input signal continuously within the predetermined time, the reset state is maintained. and outputs a reset signal _S2 . 34 is a time setting switch (time setting means) for setting the time prescribed by the timer 33;
Now, each operator can set the time range according to his or her skill level, with experts setting a relatively short time and beginners setting a relatively long time. . That is, as will be described later, if there is no key input signal continuously within the time specified by the timer 33, the printer DC motor 19 will stop after the type carrier 4 has been lowered to the visible position. If a beginner shortens the setting time to the same extent as an expert, the DC motor 19 will often stop in the middle of a key input operation, and the DC motor 1
Initial power consumption to start up 9 to steady rotation,
This is because it takes time and becomes uneconomical.

35 is a logic means controlled by the output from the timer 33, and is controlled by the main power supply 36 turn-on signal _S3 ;
A motor start signal S4 is output to the printer control circuit ₃₇ in response to a set signal S1 from the timer 33 based on the first key input signal, and the motor start signal _S4 is outputted to the printer control circuit 37.
7 starts the DC motor 19 of the serial printer P. On the other hand, the logic means 35 receives the reset signal S ₂ from the timer 33.
When the character carrier 4 of the serial printer P arrives, it outputs a VP signal _S5 for lowering the type carrier 4 to the visible position, whereby the printer control circuit 37 selects and stops the type carrier 4 of the serial printer P to the visible position.

Reference numeral 38 denotes a detection means consisting of the detectors 23 and 26, which detects the shift position and rotational position of the type carrier 4, and after the DC motor 19 starts to rotate normally, the signal from the detection means 38 and the key are detected. A gate 39 detecting the presence or absence of a signal from the input register 32
An operation command signal S ₆ based on the key input signal is output to the printer control circuit 37 via the printer control circuit 37 . That is, when the DC motor 19 starts to start,
As long as there are continuous key input signals within the time specified by the timer 33, the printer control circuit 37 sequentially performs the operations specified by the key input register 32 based on the signals continuously output from the key input register 32. A print command is output to the serial printer S, and the serial printer S
Printing operations, spacing operations, etc. are performed continuously. 40 is a reset signal _S2 from the timer 33 and the detection means 38.
This logical means opens the gate in response to the visible position detection signal _S7 from the serial printer P and supplies _a motor stop signal _S8 to the printer control circuit 37. The DC motor 19 is stopped until a new key input signal is received. That is, when the key input signals are not consecutive within the specified time determined by the timer 33,
The serial printer S is designed to stop the DC motor 19, which is the drive source, after pushing down the type carrier 4 to the visible position.This allows the operator to easily read the data on the paper immediately after printing. In addition to making it possible to see the difference in time, it is also possible to reduce motor power consumption and standby noise during unnecessary key operation waiting time that exceeds a certain period of time.

As described above, according to the present invention, in an electronic typewriter equipped with a serial printer in which a type carrier on which type is formed in multiple stages can be rotated and shifted up and down, key input signals continuously arrive within a certain period of time. Since the motor stops when there is no need to wait for an unnecessary key operation, it is possible to reduce not only power consumption and standby noise, but also wear on the mechanism. In addition, since the type carrier is positioned in a visible position before the motor stops, the operator can easily see the data on the paper immediately after printing during the key input operation time, which is extremely convenient. Since the motor is stopped by the output of the print detection signal and the timer, the type carrier is always in a visible position when the motor is stopped. It is also possible, for example, to adopt an operating mode in which the type carrier is selected to be in a visible position during a spacing operation to improve visibility. In addition, since the time specified by the timer can be freely varied depending on the operator's skill level, the key input time interval required for continuous printing can be set according to the operator's skill level. As a result, for example, even when a beginner performs a key operation with a long key input time interval, an appropriate time is set to suit the beginner, which eliminates the inconvenience of the motor frequently stopping during the key input operation. It has a remarkable effect.

[Brief explanation of the drawing]

The drawings all relate to one embodiment of the present invention; FIG. 1 is a schematic perspective view of a serial printer, and FIG. 2 is a drive circuit of an electronic typewriter. P... Serial printer, C... Carriage,
M... Rotation transmission/control unit, 4... Type carrier, 5...
...Shift axis, 6...Shift cam, 7...Shift lever, 15...Hammer, 30...Keyboard (key input means), 32...Key input register, 33
...Timer (timer means), 34...Time setting switch (time setting means), 35...Logic means, 3
7...Printer control circuit, 38...Detection means, 4
0...logical means.

Claims (1)

[Scope of claim for utility model registration] A carriage that is transported across printing paper,
In an electronic typewriter equipped with a serial printer that is equipped with a type carrier on which type is formed in multiple stages so as to be rotatable and shiftable up and down, and prints by pressing the type carrier and printing paper relative to each other, (a) printing symbols; (b) a key input register that stores input information from the key input means; (c) a key input register that stores input information from the key input means; (d) time setting means for making the fixed time specified by the timer means variable by manual operation; (e) an output from the key input means; a printer control circuit that, when inputted continuously within a certain period of time, continuously rotates the motor of the serial printer and gives a print command to the serial printer to cause the serial printer to perform the operation specified by the key input register; (f) When the output from the key input means is interrupted for more than a certain period of time, the output from the timer means causes the printer control circuit to move the type carrier to the lowest visible position ( (g) an output from said timer means when the output from said key input means is interrupted for more than a predetermined time; and logic means for stopping the motor of the serial printer based on the output of the detecting means of the serial printer that detects a certain condition.