JPS6048344B2 - How to adjust the flight time of the printing hammer - Google Patents

Description

[Detailed Description of the Invention] This invention provides a method for adjusting the flight time of a printing hammer in a line printer, and more specifically, a method for automatically setting the optimal adjustment position of a flight time adjustment means compatible with the printing hammer using an electric screwdriver. This article relates to a new adjustment method.

In general, percussion-type line printers are equipped with a configuration that constantly adjusts the flight time of the printing hammer for each digit to an optimal value in order to prevent misalignment of printed characters and deterioration of print quality. ing. As a conventional flight time timing adjustment structure, a structure in which the position of a backstop of a hammer magnet is mechanically adjusted back and forth is popular. however,
In this conventional adjustment method, the adjustment screw is adjusted using a screwdriver, and this work requires a skilled technique, and the adjustment work for each digit of the printing hammer, which usually consists of 13 digits, requires a great deal of effort. This method requires a lot of time and effort, and is therefore technically and economically unfavorable.

In view of the above-mentioned circumstances, the present invention aims to provide a new method for adjusting the flight time of a printing hammer that is technically and economically superior. Briefly stated, the present invention calculates the average value of the flight time measured based on the test operation of the printing hammer to be adjusted during the adjustment.
It compares the flight time with the reference value of the hammer, converts the deviation value into an electric signal, and then inputs it to an electric screwdriver equipped with a rotational drive means for rotationally driving the shaft body, and the deviation value of the electric screwdriver is The present invention is characterized in that the adjustment amount of the mechanical flight time adjustment means provided corresponding to the printing hammer is changed by the shaft body rotated by the corresponding amount. Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an example of implementing the flight time adjustment method of the present invention, which includes a data control unit 1, a data transfer unit 2, a drive unit 3,
It is composed of an electric screwdriver 4.

Note that 1 indicates data, address, and control signal lines. The data control unit 1 includes a central processing unit (CPU) 11 and a memory 12, and
PULL consists of a microprocessor that generates various commands according to the program, and also calculates the average value of multiple pieces of measurement data (described later) regarding the flight time of the printing hammer, and then performs a comparison operation between the average value and a reference value. The deviation value is then converted into a pulse signal to be generated, and a display signal indicating the digit number of the printing hammer that requires adjustment is generated. The memory 12 stores in advance the program data for adjusting the flight time of the printing hammer and the 136-digit standard value data of the flight time of the printing hammer. It stores flight time measurement value data for each flight. Data transfer unit 2 is an interface. Thus, the potential level of each data transferred between the data control unit 1 and the line printer 5 is converted.

In addition to the above series of printing mechanisms, the line printer 5 includes:
In response to the print command from the aforementioned Pull, the print hammer 51 for each digit is activated. A printing control circuit 54 is provided to drive and control the hammer coil 52 and the armature 53, respectively, and the hammer 51 for each digit during testing.
Measuring means 55 is provided for measuring the flight time of the aircraft. The flight time measuring means 55. Various types have been known so far, for example, Japanese Patent Application Laid-Open No. 52-2822
3 and JP-A-55-963 can be used. On the other hand, the electric screwdriver 4 is connected to the flight time adjustment screw 5 for each digit in the line printer 5 described above.
6, and includes a step motor 42 that rotates a shaft 41 in steps, and a digital display 43 that displays the digit number of the printing hammer to be adjusted.

The drive unit 3 is for driving the step motor 42 and the digital display 43 of the electric driver 4, and includes a signal level conversion circuit 31, a motor drive circuit 32, and a display drive circuit 33. . More specifically, the signal level conversion circuit 31 inputs and amplifies a pulse signal based on the deviation value of the flight time generated from the Cpull, and the motor drive circuit 32 responds to the amplified output to generate the pulse signal. In addition to driving the motor 42, the display drive circuit 33 decodes the digit number display number (digital signal) of the hammer to be adjusted generated from the Cpull to generate a segment drive signal. Next, a method for adjusting the flight time in the above configuration will be explained with reference to the flowchart shown in FIG. 1c
The pu11 issues a test operation command to the printing hammer of the first digit in the line printer 5 according to the program.

2. The printing hammer 51 is driven by the printing control circuit 53 and the hammer coil 52 in response to this command, and the flight time of the hammer at this time is measured by the flight time measuring means 55.

3. The measurement value data is input to a storage area specified by the CPU in the memory 12 via the interface 2 and is temporarily stored.

Thereafter, such an operation is repeated several dozen times, and as a result, the memory 12 stores measurement value data for several tens of times. 4c
The pu11 sequentially reads out and inputs the measured value data from the memory 12, and calculates the average value.

The 5 CPU 11 compares the hammer flight time reference value read from the memory 12 with the average value.

6. If the deviation value as a result of the comparison exceeds a predetermined standard range, Cpull outputs a number of pulse signals corresponding to the deviation value.

7cpu11 also outputs a display signal corresponding to the digit number "1" of the printing hammer at this time.

This display signal is converted into a segment drive signal by the display drive circuit 33, and then input to the digital display 43 built into the electric screwdriver 4 to display "00I". 8 Based on this display, the operator confirms that the printing hammer to be adjusted is the first digit, and aligns the shaft body 41 of the electric screwdriver 4 with the corresponding flight time adjustment screw 56.

9 On the other hand, the pulse signal train is transmitted to the signal level conversion circuit 3.
1, the motor drive circuit 32 is sequentially driven by the number of pulses, and the step motor 42 incorporated in the electric driver 4 is sequentially rotated step by step.

As a result, the electric screwdriver 4 is aligned with the adjustment screw 56.
The shaft body 41 rotates by a predetermined angle to adjust the adjustment screw. In this way, the flight time of the printing hammer for the first digit is set to the optimum value. O However, if the deviation value based on the comparison result is within the predetermined standard range, C
PULL issues a test operation command to the next second digit printing hammer without outputting the pulse signal and display signal.

Note that this second digit measurement value data is rewritten in the memory 12 with the previous first digit measurement value data. From then on,
This operation is repeated for the printing hammers from the 3rd digit to the 13th digit. ◎When all flight time adjustments for the 13-lucid printing hammer are completed, an instruction to that effect is given by the numerical display of "000" on the digital display 43, thereby completing the flight time adjustment work.
As is clear from the above description, the method for adjusting the flight time of a printing hammer of the present invention compares a reference value and a measured average value of the flight time of the printing hammer to be adjusted, and The main idea is to adjust the flight time adjustment means corresponding to the hammer by rotating it by the deviation value, so the adjustment work not only does not require advanced technology but also takes a lot of time. I don't.

Therefore, it is extremely advantageous in terms of working efficiency and cost reduction. As a flight time adjustment means, in addition to those related to the hammer magnet described above, a position adjustment mechanism for a hammer collision energy absorbing member provided between a type drum and a printing hammer is also known, and the present invention is also applicable to the present invention. This adjustment mechanism is also applicable.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of the method for adjusting the flight time of a printing hammer according to the present invention, and FIG. 2 is a flowchart for explaining this adjustment method. 1: Data control unit, 2: Data transfer unit, 3
: Drive unit, 4: Electric screwdriver, 5: Line printer, 11: Central processing unit, 12: Memory, 31: Level conversion circuit, 32: Motor drive circuit, 33: Display drive circuit, 41: Shaft body, 42: Step motor, 43: Digital display, 51: Printing hammer, 52: Hammer coil, 53: Amateur, 54: Printing control circuit, 55: Flight time measuring means, 56: Flight time adjustment screw,
1: Signal line.

Claims (1)

[Claims] 1. A method for adjusting the flight time of a printing hammer in a line printer, wherein the average flight time of the printing hammer to be adjusted is determined based on the test operation of the printing hammer during the adjustment. Compare it with a time reference value, convert the deviation value into an electric signal, input it to an electric screwdriver equipped with a rotational drive means to rotate the shaft body, and rotate the electric screwdriver by an amount corresponding to the deviation value. A method for adjusting flight time of a printing hammer, characterized in that the adjustment amount of a mechanical flight time adjustment means provided corresponding to the printing hammer is changed by a shaft body. 2. The method for adjusting the flight time of a printing hammer according to claim 1, wherein the electric screwdriver includes a display section that displays a digit number of the printing hammer to be adjusted.