JPH05261929A - Automatic print unit angle-correction device - Google Patents

Abstract

PURPOSE:To provide a device wherein deflection of ink droplets and a slant of print result due to the moving speed of a print medium are automatically corrected in an electrifying control type ink jet printer. CONSTITUTION:The subject device in an ink jet printer that performs print by discharging ink droplets 2 is achieved from a constitution wherein a function adjusting an inclination of a print character and a small sized stepping motor 8 controlled by a micro-processor are directly connected at a support metal part 5 fixing a print unit 1. Thereby, it is possible to automatically adjust an angle of the print unit in relation to a slant of a print character. Whenever moving speed of a print medium is varied, an inclination of the print unit is automatically corrected. As a result, the effect wherein the good print without an inclination even when an arrangement of a manufacturing line is omitted and so on is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing unit supporting metal fitting for a charge control type inkjet printer.

[0002]

2. Description of the Related Art A printing method of a charge control type ink jet printer is performed by ejecting ink droplets to be deflected to reach a moving object to be printed and form dot characters by the ink particle group. Therefore, when printing on a printing object that is moving at high speed, in the order in which the ink droplets reach the printing object,
The characters are printed in a tilted state. Therefore, insert a spacer between the printing unit and the printing unit mounting bracket, or use a printing unit support bracket with a tilt adjustment function.
I was manually adjusting the inclination while checking the inclination of the printed characters. Therefore, when the moving speed (conveyor speed) of the print object changes, the inclination of the printed characters changes, and the inclination adjustment is required each time. On the other hand, no device for automatic tilt adjustment that follows the moving speed of the printing object is found.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to automatically correct the inclination of a print character of an ink jet printer even if the speed of an object to be printed changes.

[0004]

SUMMARY OF THE INVENTION The above object is to provide a speed detector and a printing unit for detecting a moving speed of an object to be printed by directly connecting a stepping motor for controlling the number of revolutions with a pulse number to a support metal fitting for supporting the printing unit. The number of pulses is generated by the microcomputer that controls the angle adjustment, and the stepping motor is rotated by the number of pulses to automatically correct the inclination of the printed characters with respect to the print object of the printing unit. To be done.

[0005]

[Operation] A speed detector for directly detecting a moving speed of an object to be printed by directly connecting a stepping motor for controlling the number of rotations to a supporting metal member for supporting the printing unit, and a microcomputer for controlling an angle adjustment amount of the printing unit. The number of pulses is generated, and the stepping motor is rotated by the number of pulses to correct the inclination of the printed character with respect to the printing object of the printing unit. This eliminates the need for troublesome print unit tilt adjustment. Further, even if the moving speed of the printing object changes, it is not necessary to correct the inclination each time, and the setup of the production line can be simplified.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an embodiment of a printing unit angle automatic correction device of the present invention. In FIG. 1, the ink droplet 2 discharged from the printing unit 1 reaches the print target 4 on the conveyor 3. Characters are printed in an inclined state due to the deflection of the ink droplets 2 and the moving speed of the print target 4 (moving speed of the conveyor 3). Therefore, the printing unit 1 itself is rotated to correct the inclination of the printed characters. The printing unit 1 is fixed to the support fitting 5 with the fixing knob 6, and the support fitting 5 and the stepping motor 8 are attached.
Are directly connected by a connecting tool 7. The printing unit 1 supported by the support fitting 5 rotates by the rotation of the stepping motor 8 and the characters whose inclination is corrected are printed.

Next, a method of controlling the stepping motor 8 for finely adjusting the tilt angle of the printing unit 1 will be described with reference to FIG.

In FIG. 2, an object to be printed 4 on the conveyor 3
The moving speed of the printing object 4 is measured by the speed detector 10 that detects the moving speed of the print object. The microcomputer 9 which has received the signal from the speed detector 10 detects the distance between the printing unit 1 and the printing unit 1 which have been INPUT in advance, and the ink droplet 2
From the deflection amount and the moving speed of the printing object 4, an appropriate angle correction amount is obtained, converted into a pulse number, and sent to the stepping motor 8. The stepping motor 8 finely adjusts the tilt angle of the printing unit 1 with the received number of pulses. Further, even if the feeding speed of the printing object 4 changes, it follows it and corrects the inclination angle of the printing unit 1.

[0009]

According to the present invention, the angle of the printing unit can be automatically adjusted with respect to the inclination of the printed characters. Even if the moving speed (conveyor speed) of the printing object changes, the inclination of the printing unit can be automatically corrected each time. This simplifies the setup of the production line. Even if the moving speed of the printing object is fast, there is an effect that it is possible to perform clear printing without inclination.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing an embodiment of the present invention.

FIG. 2 is a configuration diagram of a control unit of the present invention.

[Explanation of symbols]

1 ... Printing unit, 2 ... Ink droplets, 3 ... Conveyor, 4 ...
Printed material, 5 ... Supporting metal fitting, 6 ... Fixed knob, 7 ... Connecting tool, 8 ... Stepping motor, 9 ... Microcomputer, 10 ... Speed detector.

Claims (2)

[Claims] 1. A support metal fitting for mounting a printing unit of an ink jet printer for ejecting ink droplets for printing, the support metal fitting having a function of adjusting a tilt of a print character and a small stepping motor controlled by a microcomputer. Characteristic printing unit angle automatic correction device. 2. A printing unit angle, comprising a speed detector for detecting a moving speed (conveyor speed) of an object to be printed, and operating a stepping motor so as to change an inclination of the printing unit in association with a detection signal. Automatic correction device.