JPS62255177A - Printer - Google Patents

Abstract

PURPOSE:To enhance an ink platen in durability and to enable a sharp printing to be kept for a long period of time, by a method wherein the ink platen runs in a printing line's direction together with a printing head while varying its relative position to the printing head in a printing line's direction and in a printing paper feeding direction. CONSTITUTION:An ink platen 1 is; rotatably held through a bearing 5 by a hold body 4 being slidably set onto a shaft 3, slidably mounted on a square shaft 6, and rotated due to the rotation of the square shaft 6. With an actuation of a motor 12, a printing head 7, being held by a carriage 8 and the holding body 4, and the platen 1 synchronously move to conduct printing on a printing paper 11. At this time, since a pulley 13 is made larger than a pulley 14 in diameter, the platen 1 is travelled in a printing line's direction together with the printing head 7 while varying its relative position to the printing head 7. On the other hand, the ink platen 1 is travelled in a feeding direction of the printing paper 11 due to the rotation of the square shaft 6 by the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to printers, and particularly to a printing method in an ink platen type printer that uses an ink platen having an ink-impregnated porous material as a printing surface. be.

(Prior Art) Recently, various printers have been used as terminal devices for office automation equipment such as personal computers and word processors, and one of them is an ink platen type printer.

In this method, a print head and an ink platen having an ink-impregnated porous material as a print surface are placed facing each other with a predetermined gap, and the print paper is guided into the gap to be used as a character forming element of the print head. This printer prints characters, symbols, figures, etc. on printing paper by selectively striking the surface of the ink platen with a printing wire.

The printing mechanism of the ink platen printer is as shown in Fig. 3, where (a) shows the state before printing, 7a is the printing wire,
Reference numeral 11 indicates a printing paper, and reference numeral 2 indicates an ink-impregnated porous body. In this state, the ink-impregnated porous body 2 is uniformly impregnated with ink.

(b) shows a printing state, in which the printing wire 7a hits the surface of the ink-impregnated porous body 2, and the ink on the surface of the ink-impregnated porous body 2 is transferred to the surface of the printing paper 11, and printing is performed. Surface deformation and decrease in ink concentration occur in the portion 2a of the impregnated porous body 2 that is hit by the printing wire 7.

Therefore, immediately after the printing operation is completed, as shown in (C), the portion 2a of the ink-impregnated porous body 2 to be struck by the printing wire 7a.
is in a state where the surface is depressed and the ink concentration is lower than other parts, and after a predetermined period of time, as shown in (d), the struck part 2a of the ink-impregnated body 2 recovers from the depression and the ink from other parts is removed. Replenishment also makes the ink density uniform.

Considering the above-mentioned printing mechanism of an ink platen type printer, the ink-impregnated porous material has the strength to withstand the beating by the printing wire, and in order to smoothly advance the cycle of the above-mentioned printing mechanism and improve printing performance. It is preferable that the material has appropriate elasticity, and a sintered nylon resin body impregnated with ink is suitable for this purpose.

In addition, by increasing the length of the effective printing part of the ink-impregnated porous material, it is possible to avoid frequently hitting the same spot with the printing wire, thereby preventing damage to the surface, and recovering the dents in the area hit by the printing wire. and preferred to give time for ink replenishment.

However, it is extremely difficult to form a long nylon resin sintered body in terms of dimensional accuracy, and the ink platen does not have a long effective printing area that spans the entire width of the printing paper.
Printing has been performed using a relatively short platen while moving the platen in the print line direction in synchronization with the print head.

(Problems to be Solved by the Invention) As described above, when printing is performed while moving the short ink platen in synchronization with the print head, if both move at exactly the same speed, the same location on the surface of the ink-impregnated body is continuously printed. The surface is easily damaged, and there is not enough time for the dents in the hit area to recover and replenish the ink, which may cause holes in the printing paper or the inability to print clearly. disadvantages arise.

Furthermore, in order to solve the above-mentioned drawbacks, it is conceivable to provide a difference in the moving speed of the ink platen A and the print head B as shown in FIG. As shown in the figure, the striking points of the printing wire overlap in a part of the diagonal line 3, and in order to avoid this and increase the difference, it is necessary to increase the width of the ink platen, which results in difficulties in manufacturing. becomes.

In view of the current situation as described above, the present invention was created as a result of extensive research into a printing method for ink platen printers that can increase the durability of the ink platen and maintain clear print over a long period of time. It is something.

(Means for Solving the Problems) That is, the present invention provides a print head and an ink platen having an ink-impregnated porous material on its surface as a print surface, which are arranged facing each other with a printing paper interposed therebetween. In an ink platen type printer that prints on print paper by selectively striking the surface of the ink platen, the ink platen is positioned relative to the print head in the print line direction and print paper feed direction. This printer is characterized in that it moves in the printing line direction while changing its position.

(Function) The present invention is constructed as described above, and its function is achieved by moving the ink-impregnated platen in the print line direction together with the print head while changing the relative position of the ink-impregnated platen with respect to the print head in both the print line direction and the printing paper feeding direction. The printing operation is performed using the entire effective printing surface of the body, increasing the durability of the ink-impregnated body and ensuring clear printing over a long period of time.

(Example) In FIG. 1, 1 is an ink platen, and the ink platen 1 has a plurality of ink-impregnated porous bodies formed by impregnating a nylon resin sintered body with inks of different colors as printing surfaces. 2 on the surface.

The ink platen 1 is rotatably held via a bearing 5 by a holder 4 that is slidable with respect to a shaft 3, and the ink platen 1 has a square shaft 6 that is inserted through the bearing 5 and the ink platen 1.
It is slidable relative to the shaft 6 and rotated by the rotation of the square shaft 6, thereby selecting a printing color and moving the relative position with respect to the print head in the printing paper feeding direction, which will be described in detail later.

Further, in the ink platen I, the holder 4 is connected to the shaft 3 and the bearing part 5.
When it is moved along the ffj axis 6 in the print line direction via the holder 4, it is moved together with the holder 4.

A print head 7 having a print wire as a character forming element is fixed to a carriage 8, and the carriage 8 is guided by guide shafts 9 and 10 and is slidable in the print line direction.

Print paper IN, ink platen 1 placed opposite
The ink is sent in the six directions of the arrows through the gap between the ink platen I and the printing head 7, and is selectively struck by the printing wire of the printing l\rad on the surface of the ink-impregnated porous body 2, which serves as the printing surface of the ink platen I. , Ink platen I of printing paper 11
Characters, symbols, figures, etc. are printed on the side surface in a predetermined color.

Next, tili[l[ of ink platen I and print head 7
To explain the N structure, pulleys 13 and 14 having different diameters are fixed to the rotating shaft 12a of the motor 12.
The pulley diameter of pulley 13 is larger than that of pulley 14.

15 is a wire for transmitting the driving force of the motor 12 to the carriage 8, and the wire 15 is fixed to the carriage 8 by a screw I9 and is connected to a guide roller 16.1.
The hook is passed through 7.18, and both ends are wound and fixed to the pulley 13.

Further, 20 is a wire for transmitting the driving force of the motor 12 to the holder 4, and the wire 20 is fixed to a part of the holder 4 with a screw 24 and the guide rollers 21, 22.
．． 23 and both ends are wound and fixed to the pulley 14.

Therefore, when the rotating shaft 12a rotates with the operation of the motor 12, the wires 15 and 20 each have one end connected to the other end.
and 14, and the other end is unwound by an amount equal to the winding distance, and both the carriage 8 and the holder 4 move to the left or right of the printing line. The held print head 7 and ink platen 1 move synchronously to perform a printing operation on the printing paper 11.

As mentioned above, the diameter of the pulley 13 is larger than the diameter of the pulley 14, so naturally the print head 7 driven via the pulley 13 is moved at a faster speed than the ink platen 1, and the print head of the ink platen 1 is This means that the relative position with respect to 7 in the printing line direction is being changed and moved together.

In FIG. 2, as shown by the arrow, first, assuming that printing is to be performed from left to right on the printing paper Il, the printing tip of the printing head 7 and the ink platen 1 are located at the left end position B of the maximum printing width of the printing paper 11.
First, the initial position is adjusted so that the left edge of the effective printing width of .

Next, based on the maximum print width I7 of the print paper 11 and the effective print width 1 of the ink platen I, if the ratio of the diameters of the pulley I3 and the pulley 14 is L/(L-1), then the print tip of the print head 7 When it reaches the right end C of the maximum printing width of the printing paper II, it coincides with the right end of the effective printing width of the ink platen 1, and the printing operation is performed using the entire effective printing width of the ink platen 1.

In the above embodiment, one motor is used and two pulleys with different diameters are fixed to the rotating shaft to change the moving speed of the print head and the ink platen. It is also possible to use two motors, one for the ink platen and one for the ink platen, to provide a difference in moving speed.

Next, regarding the movement of the ink platen 1 in the feeding direction of the printing paper 1 which is perpendicular to the printing line direction, the ink platen 1 is configured to be rotated by a square shaft 6 as shown in FIG. This is done by rotating the square shaft 6 by a motor (not shown).

Further, as shown in the embodiment, when the ink platen 1 has a plurality of ink-impregnated porous bodies 2 of different colors as printing surfaces to perform color printing, the square shaft 6 is similarly rotated to select the color.

3 and 4 show the striking points of the printing wire on the surface of the ink-impregnated porous body 2 when the relative position of the ink platen 1 with respect to the print head 7 is changed in both the printing line direction and the printing paper feeding direction. ing.

In FIGS. 3 and 4, (a) shows the movement of the ink platen A and the print head B, and (b) shows the hitting points by the printing wire on the surface of the ink-impregnated porous body 2, It has been shown that it is possible to avoid hitting the exact same points or points that match each other continuously as in the conventional method.

Therefore, if such a printing method is adopted, sufficient time is provided for the dents to recover and ink to be replenished before the point that has been struck once is struck again.

FIG. 5 shows the locus of the striking point by the printing wire on the surface of the ink-impregnated porous body 2, and (a) shows the conventional example in which the ink platen moves only in the printing line direction together with the printing head. , (b) and (C) are cases in which the ink platen according to the present invention changes its relative position with respect to the print head and moves in the print line direction and in the printing paper feeding direction perpendicular to this.

As shown in FIGS. 5(b) and 5(C), by appropriately determining the printing start position and the amount of change in the relative position of the ink platen to the print head, the entire effective printing area of the ink platen can be used to print with the printing wire. Printing work can proceed smoothly without continuously overlapping the striking points.

(Effects) The present invention has the above-described structure and operation, and the surface of the ink-impregnated porous body, which becomes the printing surface in an ink platen printer, has dots continuously overlapped over the entire effective printing surface. Since the ink is struck in a state that avoids being damaged, the dent at the striking point is restored and ink is replenished smoothly, ensuring good printing performance and durability over a long period of time.

Therefore, it becomes possible to use an ink platen with a relatively short printing width as an ink platen of an ink platen type printer, and it becomes possible to easily manufacture a nylon sintered body for forming an ink platen with high precision.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the main parts of the present invention, FIG. 2 is a diagram showing the positional relationship between the print head and the ink platen, FIGS. 3 to 5 are diagrams showing the printing state of the present invention, and FIG. The figure shows the printing of an ink platen printer-I! - A diagram showing the mechanism, and FIG. 7 is a diagram showing a conventional printing state.

Claims (1)

[Claims] A print head and an ink platen having an ink-impregnated porous material on the surface as a printing surface are arranged facing each other with printing paper interposed therebetween, and printing is performed by selectively hitting the surface of the ink platen with a printing wire as a character forming element of the print head. An ink platen type printer that prints on paper, characterized in that the ink platen moves in the print line direction while changing its relative position relative to the print head in the print line direction and the print paper feeding direction.