JPS5812623B2 - injisouchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a printing device which selects a type formed on the outer peripheral surface of a printing wheel, drives a printing hammer, and prints on a recording paper interposed between the type and the printing hammer. Regarding.

In this kind of conventional printing device, which selects the type formed on the outer peripheral surface of the printing wheel and prints by driving the printing hammer, the printing wheel is always rotated at a constant speed, and the printing on the printing wheel is When the desired type to be printed reaches a predetermined position, this is detected and the printing hammer is driven to print, and printing is performed while the pick print wheel is rotating.

In a printing device that prints while rotating the printing wheel, the rotation of the printing wheel and the drive of the printing hammer must be perfectly synchronized, so the mechanism is very complex and adjustment is extremely difficult. It's a hassle.

Furthermore, since the type and the print marks are in a state of relative movement, the print may be rubbed, which poses a problem in terms of print quality.

As a way to improve the above-mentioned problem, it is conceivable to print by stopping the printing wheel each time a character on the printing wheel is selected.

However, when stopping the rotation of the printing wheel mechanically or electrically, it is difficult to stop the printing wheel instantaneously using a brake signal, and when the brake is applied, the printing wheel causes damped vibration around the stopping point. while stopping after a predetermined time.

For this reason, the printing hammer must be driven in anticipation of the stopping time after the printing wheel is braked.

In this case, the time required for the printing wheel to stop differs because the rotational speed of the printing wheel differs depending on the drive rotation distance from one stopped state to the next stopped state.

Therefore, the printing hammer is driven in anticipation of the maximum time required for stopping, but if this is done, all printing takes a long time and the printing speed decreases.

The present invention has been made in view of the above points, and in a printing device that stops the printing wheel each time printing, the driving rotation of the printing wheel is improved by changing the driving timing of the printing hammer according to the rotational driving distance of the printing wheel. It is an object of the present invention to provide a printing device that can efficiently control printing regardless of distance.

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

In FIG. 1, reference numeral 11 denotes a printing wheel made of, for example, an insulating material, and on its outer circumferential surface, letters such as 0, 1, 2, etc. are formed in a row, and an example of a motor is an wafer pulse motor 12. Driven by steps.

This motor 12 is driven and controlled by a motor control section 13.

Further, a conductive portion 11a is formed on the side surface of the printing wheel 11, extending from the center toward a reference position on the circumferential surface, such as a position where a printed character "0" is formed.

A contact piece 14 is disposed so as to come into sliding contact with the side surface of the printing wheel 11 on which the conductive portion 11a is formed.

This contact piece 14 is connected to the V power source via a resistor 15, and detects the reference position of the printing wheel 11 by coming into contact with the conductive portion 11a as the printing wheel 11 rotates.

A reference position signal of the printing wheel 11 detected by the contact piece 14 is sent to the motor control section 13 .

Further, a printing hammer 16 is provided so as to face the type forming surface of the printing wheel 11 with a predetermined distance therebetween.

This printing hammer 16 is driven by a hammer drive circuit 11, and printing is performed on a recording paper 18 interposed between the printing wheel 11 and the printing hammer 16 by striking the printing surface of the printing hammer 16.

In this case, the recording paper 18 is sequentially transferred to the side with the printing operation, and the printing surface of the printing wheel 11 is coated with an ink roller (
(not shown).

A step memory 19 is connected to the motor control section 13.

This step memory 19 stores code data corresponding to the printed characters formed on the printing wheel 11, and outputs the code data for the printed characters facing the printing hammer 16 as the printing wheel 11 rotates.

The code data output from the step memory 19 is sent to a coincidence circuit 20 and also to a hammer control circuit 21, the details of which will be described later.

The matching circuit 20 and hammer control circuit 21 are supplied with print data from a buffer register 22.

That is, this buffer register 22 temporarily stores print data given from, for example, the computer control unit 23, and the print data stored in this buffer register 22 is sequentially read out from the first data and sent to the matching circuit 20 and the hammer. The signal is sent to the control circuit 21.

The matching circuit 20 compares the data given from the buffer register 22 and the step memory 19, and outputs a "1" signal if they match.

This "1" signal is sent to the motor control section 13 as a stop command signal, and is also sent to the hammer drive circuit 17 as a drive signal via the gate circuit 24.

The gate circuit 24 is gate-controlled by the output of the hammer control circuit 21, and is configured to close the gate while the hammer control circuit 21 is applying the 1'' signal.

Further, the output signal of the matching circuit 20 is sent as a clear signal to the buffer register 22 via the delay circuit 25.
The data read from the buffer register 22 to the matching circuit 20 is cleared.

The hammer control circuit 21 also includes a motor control circuit 1.
3 and the output signal of the matching circuit 20 are supplied.

The hammer control circuit 21 performs a subtraction operation between the data provided from the buffer register 22 and the data provided from the step memory 19, and controls the gate circuit 24 based on the subtraction result to control the drive of the hammer drive circuit 17. The details are shown in Figure 2.

In FIG. 2, numeral 31 is a subtraction circuit that subtracts the data provided from the step memory 19 from the data provided from the buffer register 22, and the subtraction output is sent to the storage circuit 33 via the AND circuit 32.

The AND circuit 32 is gate-controlled by a start pulse given from the motor control section 13.

The memory contents of the memory circuit 33 are stored in the AND circuit 34.
is set in the subtraction counter 35 via the subtraction counter 35.

In this case, the AND circuit 34 is gated by the output of a monostable multivibrator 36 to which the output of the coincidence circuit 20 is applied as a trigger signal.

The subtraction counter 35 is a clock pulse crc generated every predetermined time when the memory contents of the memory circuit 33 are set.
Synchronization L is sequentially stepped down, and the Nlft signal is output until the count reaches zero.

The output signal of this subtraction counter 35 is transmitted to the hammer control circuit 21.
This output signal is sent to the gate circuit 24 as a gate control signal.

That is, the hammer control circuit 21 controls the gate circuit 24 according to the driving rotation distance from the stopped state of the printing wheel 11 to the next stopped state by the operation of the subtraction circuit 31 and the subtraction counter 35, and controls the hammer drive timing. It was designed to do this.

In this case, the period of the clock pulse that drives the subtraction counter 35 is the time width during which the output of the subtraction counter 35 is "1", that is, the operation time width T is the period from when the stop command to the motor 12 is given to when the motor 12 Set this to match the time until it stops reliably.

Next, the operation of the apparatus of the present invention configured as described above will be explained.

When print data is output from the computer control section 23, this print data is first stored in the buffer register 22.

When the print data is stored in the buffer register 22, the leading data is read out and sent to the coincidence circuit 20 and also to the subtraction circuit 31 in the hammer control circuit 21.

At this time, since the subtraction circuit 31 is given the code data corresponding to the printed character facing the hammer 16 from the step memory 19, the data read from the buffer register 22 and the data given from the step memory 19 are different. A subtraction operation is performed between.

For example, when the print data read from the buffer register 22 is "8" and the data given from the step memory 19 is "6", a subtraction operation of r 8-6 = 2 J is performed in the subtraction circuit 31. .

Further, the print data read from the buffer register 22 is sent to the motor control section 13 as a start signal.

As a result, the seven-point controller 13 starts operating as shown in FIG. 3a, drives the motor 12, and applies a start pulse shown in FIG.

The AND circuit 32 opens its gate in response to the start pulse, and the subtraction output of the subtraction circuit 31, for example "2", is sent to the storage circuit 33 and temporarily stored therein.

On the other hand, the motor control section 13 sends a step signal to the step memory 19 for each step of driving the motor 12, and sequentially advances the designated address in the step memory 19.

As a result, data for the printed characters facing the hammer 16 are sequentially read out from the step memory 19 in accordance with the rotation of the printing wheel 11 and sent to the matching circuit 20.

The matching circuit 20 compares the printing data given from the buffer register 22 with the printing data given sequentially from the step memory 19 in accordance with the rotation of the printing wheel 11, and if they match, the data is changed as shown in FIG. 3C. Outputs a match signal.

This coincidence signal is sent to the motor controller 13 as a stop command signal, and the motor controller 13 stops the motor 12.

Further, the output signal of the matching circuit 20 is transmitted to the gate circuit 24.
It is also sent as a trigger signal to the monostable multivibrator 36 in the hammer control circuit 21, and the monostable multivibrator 36 outputs the pulse signal shown in FIG. 3d.

This output signal opens the gate of the AND circuit 34, and the data "2" stored in the storage circuit 33 is inputted to the subtraction counter 35 via the AND circuit 34.

When data is set in this subtraction counter 35, its output signal becomes ゜゛1'' and the gate of the gate circuit 24 is closed.

Therefore, the output of the matching circuit 20' is blocked by the gate circuit 24 and is not sent to the hammer 1 drive circuit 17.

When the data is set, the subtraction counter 35 starts a step-down operation in synchronization with the clock pulse, and repeats "1" until the counter content reaches zero, as shown in FIG. 3e.
It is outputting a signal.

Therefore, the time width T during which the subtraction counter 35 outputs the "1" signal changes depending on the set contents of the subtraction counter 35.

When the content of the subtraction counter 35 becomes zero, the output of the subtraction counter becomes "0", the gate of the gate circuit 24 is opened, and as shown in FIG. The match signal shown in Figure C is the gate circuit 24.
The signal is sent to the hammer drive circuit 17 via.

As a result, the hammer drive circuit 17 operates, and the printing hammer 16
is driven to print designated data, in this case "8", on the recording paper 18.

That is, after a stop command is issued to the thousand-point controller 13, the printing hammer 16 is driven after waiting for the subtraction counter 35 to complete its operation.

In this case, as described above, the operating time width T of the subtraction counter 35 is set to match the time from when the stop command for the motor 12 is given until the motor 12 stops reliably, as described above. , the printing hammer 16 is driven and printing is performed with the printing wheel 11 stopped.

Further, the output signal of the matching circuit 20 is delayed for a predetermined time via a delay circuit 25 and then sent to the buffer register 22 as a clear signal, and the leading data in the buffer register 22 is erased by this clear signal. .

By erasing this leading data, the next data in the buffer register 220 becomes the leading data, and the matching circuit 220
etc., and the printing operation as described above is started.

The data stored in the buffer register 22 in this manner is sequentially read out and printed on the recording paper 18.

In this case, the hammer control circuit 21 controls the step memory 1 when the printing wheel 11 is in a stopped state when starting the printing operation.
A subtraction operation is performed between the data sent from the buffer register 22 and the print data sent from the buffer register 22, and the time width T of the output signal is changed based on the subtraction result to adjust the drive timing of the printing hammer 16. is under control.

Since the rotational speed of the printing wheel 11 differs depending on the drive rotation distance from one stopped state to the next stopped state, the time from when it is brake-controlled until it stops differs.

The time required for the printing wheel 11 to stop is determined by the drive rotation distance, so as described above, the time required for the printing wheel 11 to stop is determined by the driving rotation distance.
By setting the driving timing of the printing hammer 16 according to the driving rotation distance of 1, the printing hammer 16 can be driven immediately after the printing wheel 11 stops, thereby eliminating wasted time and improving printing efficiency. .

In the above embodiment, the driving rotation distance of the printing wheel 11 and the time required for stopping the printing wheel 11 are proportional to each other. It varies depending on whether a stepping motor is used and how it is driven.

However, once the conditions are determined, the direction and amount of change in the time required for stopping are determined, so the operation settings of the hammer control circuit 21 can be made.

As described above, according to the present invention, since the printing operation is performed while the printing wheel is stopped, the printing mechanism is extremely simple, and the drive timing of the printing hammer is adjusted according to the driving rotation distance of the printing wheel. Since the printing hammer is controlled, the printing hammer can be driven immediately after the printing wheel stops, thereby eliminating wasted time and providing a printing device that can perform efficient printing control.

[Brief explanation of the drawing]

Fig. 1 is a circuit system diagram showing an embodiment of the present invention, Fig. 2 is a circuit system diagram showing details of the hammer control circuit in the same embodiment, and Fig. 3 is a timing chart for explaining the operation of the embodiment. It is a chart. 11... Printing wheel, 12... Motor, 1
3...Motor control unit, 17...Hammer drive circuit, 19...Step memory, 21...
...Hammer control circuit.

Claims (1)

[Claims] 1. A printing wheel with printed characters formed on its outer circumferential surface, a hammer disposed opposite to the printing wheel, a motor that rotationally drives the printing wheel, and a motor that faces the hammer when the printing wheel is stopped. a storage means for storing the stop character position of the printed characters; a detection means for detecting the print character position of the printing wheel rotationally driven by the motor during printing operation; and means for driving the hammer after a time corresponding to a rotational distance of the printing wheel indicated by the stop character position and the print character position when the motor starts the stop operation. printing device.