JPS5973979A - Automatic printing regulation mechanism - Google Patents

Abstract

PURPOSE:To align printed characters on one straight line while aligning impact timings of all hammers, by a method wherein elements each for detecting the impact timing of each hammer are provided on a type drum and the flight time of the hammer is regulated. CONSTITUTION:Piezoelectric elements 7 each corresponding to one line are embedded in the type drum of a type line printer corresponding to each figure to fabricate a maintenance command. The operation of the maintenance command prints the part of the piezoelectric element 7 at every one figure and repeated to the max. numbers of figures of the apparatus. When a magnet is excited at every each figure by this operation, the count-up of a counter 10 is started by the signal from a control circuit 13 and, when the piezoelectric element 7 of the type drum 1 is struck by a hammer 5, the counter 10 is stopped through rotary shaft and a brush 9. The difference of the value of the counter 10 at this time and a reference flight time value is taken by difference circuit 11 and an exciting drive power source 6 is driven by timing shifted corresponding to the difference value thereof.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Technical Field of the Invention The present invention relates to automatic adjustment of the amount of deviation in the flutter time of a magnetic hammer in a type line printer.

(2) Background of the technology, conventional technology, and problems In type drum printers, a hammer driven by a magnet strikes the ink ribbon, and when the hammer hits the printing paper between the ink ribbon and the type drum, the hammer hits the printing paper between the ink ribbon and the type drum. The type on the type drum located at is printed on the paper. FIG. 1 shows a conceptual diagram of a conventional type drum printer.

In FIG. 1, 1 is a type drum, 2 is an ink ribbon, 3 is a drum rotating shaft, 4 is an excitation coil, and 5 is a printing hammer.

Generally, the time from when the excitation coil 4 of the magnet is excited until the hammer 5 hits the type drum 1 is called flight time.

This flight time normally has a large amount of variation due to manufacturing variations in the magnet and hammer 5, etc.

This resulted in uneven printing, and the printing did not line up in a straight line on the paper, making it difficult to read.

(3) Purpose of the Invention The purpose of the present invention is to provide a type drum type printer device.
To improve the printing quality of a printer device by correcting one-key printing unevenness and thereby eliminating printing unevenness.

(4) Structure of the Invention The present invention detects the keystroke timing of the magnetic hammer with an honest element on the type drum to obtain the keystroke timing of the magnetic hammer.Therefore, by automatically adjusting the magnet excitation timing, flight irregularities of the print hammer can be eliminated. There is a special enemy in losing the .

(5) Implementation sequence of the invention Embodiments of the present invention will be described in detail below with reference to FIG.

In FIG. 2, steps 1 through 6 are as explained in FIG. 1. 6 is an excitation current source for the magnet. The excitation current dα6 is controlled by the control circuit 13, and causes the excitation current to flow through the excitation coil to excite the magnet. Reference numeral 7 designates a piezoelectric element on the drum, and when the hammer 5 hits it, it generates a current, which is sent to the control circuit 13 via the bus of the rotating shaft 3 and C8. The magnet control circuit 13 can know the actual hammer keying timing from the signal from the pressure element 7. From this timing, it knows the deviation from the flight time design and automatically adjusts the magnet excitation timing from the deviation signal. If you make the correct correction, you can obtain a type drum that is completely free of flight deviation.

FIG. 3 shows an automatic print adjustment mechanism centered on the circuit of the present application. In the figure, 1 is a type drum, 7 is a piezoelectric element, 9 is a brush,
10 is a counter, 11 is a differential circuit, and 12 is a memory.

A maintenance command is created by embedding the piezoelectric elements 7 for one line of the type drum lK corresponding to each digit.

The maintenance command operation prints the piezoelectric element 7 one digit at a time, and repeats the operation until the maximum number of digits of the device is reached.

When the magnet is excited for each digit by this operation, the counter 10 starts counting up in response to a signal from the control circuit 13, and when the hammer hits the pressure element of the type drum 1, the rotary shaft 3. The counter 10 is stopped via the brush 9.

A difference circuit 11 calculates the difference between the value of the counter 10 at that time and the standard flight time value, and stores the difference value in the memory 12 for each digit. The value is reflected in the excitation time during actual printing operation.

That is, when the maintenance operation is completed and the normal O operation is started, the control circuit 13 reads the difference value from the memory 12 in accordance with the printed digit, and at a timing shifted by the difference value, the excitation current shown in FIG. power source 6.

As a result, the timing of the hammer hitting the type drum 1 is the same for each ti, and the printed characters are arranged in a straight line on the same paper, making the printing quality uniform and easy to read.

(6) Effects of the Invention The present invention eliminates printing unevenness and provides uniform cylinder printing quality.

[Brief explanation of the drawing]

Figure 1 is a diagram showing the conceptual configuration of a conventional printer; Figure 2;
FIG. 3 shows a printer device having automatic print adjustment based on flight time detection according to the present invention. l2γ Divination drum 2: Ink ribbon 3: (8-character drum rotation axis 4; Hammer drive magnet 6: Printing c/7 6: Magnet drive 2; Piezoelectric element 8: Flight timing signal feedback bus 9: Brush 10: Counter 11: Differential circuit 12: Memory

Claims (1)

[Claims] An automatic print adjustment mechanism in a type drum type printer device, characterized in that an element for detecting the keystroke timing of a magnetic hammer is provided on the type drum, and the flight time of the hammer is adjusted based on a signal from an upper 7Q element.