JPS62103145A - Printing method on printing device - Google Patents

Abstract

PURPOSE:To form a clear character by a weak impact force, by moving either a platen or a printing element in both going and returning directions by a very small distance relatively to the other side in printing operation of a printing element. CONSTITUTION:If the key on a keyboard 20 is operated, CPU20 drives a type selection motor 11 and arranges a type 12b by opposing it to the printing row of a platen 2. Then, CPU20 drives a motor 7, moves a carriage 6 forward to a printing position, drives a solenoid 16 and arranges a printing ribbon 17 at a lift position facing the printing row of the platen 2. CPU20 drives a solenoid 13, a printing hammer 14 is actuated and a type 12b is struck onto the platen 2. At that time, a printing paper 3 is moved by very small distance (one step content of paper feed motor, approx, 1mm) in both advancing and up. Thereby, the shock sound can be lessened by setting the slight striking force of a printing element and the printing can be clearly carried out.

Description

Detailed Description of the Invention (Industrial Application Field) This invention moves the printing element step by step along the printing line of the platen, and performs a printing operation each time it is placed at each movement position, so that the printing element moves forward of the platen. The present invention relates to a printing method in a printing device that prints on printing paper on a platen via a printing ribbon placed on a printing ribbon.

(Prior art and problems to be solved by the invention) Conventionally,
When performing printing operations with this type of printing device,
With the selected printing element facing the printing paper on the platen, and with the paper feeding operation, ribbon winding operation, etc. stopped, the printing element is struck by a hammer.

However, in this conventional printing device, in order to print clear characters, the printing element is struck with strong force, and the striking action is performed with the paper feeding and ribbon winding operations stopped. However, there was a problem in that loud noises were likely to be generated depending on the impact force applied to various parts due to the tapping action.

(Object of the invention) This invention was made in view of the above circumstances, and
The purpose of this invention is to provide a printing method for a printing device that can reduce the impact noise by setting the striking force of the printing element to a low level, and that can also print clearly.

(Means and operations for solving the problem) In order to achieve the above object, in this invention, during the printing operation of the printing element, at least one of the platen or the printing element is moved slightly relative to the other. I try to move it back and forth.

Therefore, the printing ribbon and printing paper are displaced relative to each other, shearing stress is applied to the printing ribbon, and the ink in the printing ribbon is reliably transferred and adhered from the printing ribbon to the printing paper, and clear characters are formed with a weak impact force. Ru.

(Example) An example embodying the present invention will be described below with reference to the drawings. First, to explain the structure of a typewriter used to carry out the printing method of the present invention, as shown in FIG. The printing paper 3 is supported around its outer periphery. A pair of guide shafts 4.5 extending parallel to the platen 2 are installed on the frame 1, and a carriage 6 is supported on both guide shafts 4, 5 so as to be movable along the platen 2.

The frame 1 is provided with a carriage drive device consisting of a carriage drive motor 7, four rollers 8, a wire 9, etc., and one end of the wire 9 suspended between the rollers 8 is connected to a pulley 10 of the carriage drive motor 7. At the same time, the other end is fixed to the carriage 6. Then, the carriage drive device is activated based on a predetermined print signal, and the carriage 6 is reciprocated along the platen 2.

As shown in FIG. 2, a type selection motor 11 consisting of a step motor is mounted on the carriage 6. On the output shaft 11a of the type selection motor 11, a type wheel 12 is attached at its center portion 12c, and the type wheel 12 has type characters 12b, each of which is a printing element of the present invention, on the outer end surface of a plurality of radial spokes 12a on the platen side. ing.

Then, by rotating the type selection motor 11, the selection operation of the type 12b is performed, and the selected predetermined type 1 is selected.
2b is arranged opposite to the print line of the platen 2.

Further, a printing hammer 14 operated by a hammer solenoid 13 is placed on the carriage 6 so as to face the printing line of the platen 2.

Furthermore, a ribbon cassette (not shown) that accommodates a printing ribbon 17 in a windable manner is disposed on the carriage 6, and a portion of the printing ribbon 17 is placed between the platen 2 and the type 12b of the type wheel 12. Exposed for driving. This printing ribbon 17 is then wound up by a ribbon drive motor 15 shown in FIG.
A ribbon lift solenoid 16 lifts the ribbon to a printing position facing the platen 2.

Then, the preselected type 12b is arranged facing the printing line of the platen 2, and with the printing ribbon 17 lifted to the printing position, the type 12b is struck toward the platen 2 by the printing hammer 14. , characters are printed on the printing paper 3 on the platen 2 via the printing ribbon 17.

As shown in FIG. 1, a paper feed motor 18 consisting of a step motor that can rotate in both forward and reverse directions is supported on one inner surface of the frame 1, and the rotation of its output shaft 18a is transmitted by a rotation transmission mechanism consisting of a plurality of gears. 19 to the rotating shaft 2a of the platen 2, and by rotating the platen 2, the printing paper 3 is fed line by line.

Next, the electrical configuration of a typewriter will be explained with reference to FIG.
PU21 is a carriage drive circuit 22. Type selection drive circuit 23. The carriage drive motor 7, the type selection motor 11 and the hammer solenoid 13 . Ribbon drive motor 15
and the ribbon lift solenoid 160 and the paper feed motor 18, respectively, to drive each motor and each solenoid in a predetermined order.

Now, the operation of the typewriter constructed as described above and the printing method will be explained based on the flowchart shown in FIG. First, when a predetermined key on the keyboard 20 is operated, step S1. In step S2, CPU2
0 drives the type selection motor 11 to rotate the type wheel 12, so that the type 12b corresponding to the operated key is placed facing the print line on the platen 2.

Next, the CPU 20 drives the carriage drive motor 7 in steps S3 and S4 to move the carriage 6 step by step to the printing position. Next, CPtJ20 performs step S.
5, the ribbon lift solenoid 16 is actuated to place the print ribbon 17 at a lift position facing the print line on the platen 2. When the printing preparation is completed through the above process, the CP
U20 starts driving the hammer solenoid 13 in the next step S6. The printing hammer 14 is actuated by the hammer solenoid 13, and the previously selected printed character 12b is struck by the hammer 14 toward the platen 2.

At this time, during the operation of the hammer 14, a process is performed to move the printing paper 3 by a very small amount (in this embodiment, one step of the paper feed motor, approximately in) in the forward and reverse 100-line feeding directions. .

That is, the CPU 20 controls the paper feed motor 1 in step S7.
8 to rotate the platen 2 in the forward direction and transport the printing paper 3 by one step in the forward direction of line feeding. Next, in step S8, after a waiting time of 1 ms has elapsed, the platen 2 is now rotated in the opposite direction, and the printing paper 3 is moved by one step in the opposite direction to the line feeding direction. and,
After waiting again for one period in step SIO, it is determined in step S11 whether or not the drive time of the hammer solenoid 13 has ended, and if the result is No, the processes from step 37 to step SIO are repeated. It will be done. on the other hand,
If the determination result is YES, the CPU 20 stops driving the printing hammer 14 in the next step S12, and in the next step S13, drives the ribbon drive motor to wind up the used printing ribbon. - End the character bone printing cycle.

Incidentally, since the platen 2 is reciprocated at high speed in steps 87 to SIO, the printing paper 3 actually moves by a much smaller amount than the movement amount 1fl corresponding to one step angle.

As described above, in this embodiment, when striking the type 12b based on the drive of the hammer solenoid 3, the printing paper 3 is reciprocated by a small amount relative to the type 12b together with the platen 2. Even if the striking force is set to be weak, shear stress acts on the printing ribbon 17, and the printing ribbon 1
7 can be reliably transferred to the printing paper 3,
Clear printing is possible. Furthermore, impact noise can be made extremely small.

Note that the present invention is not limited to the embodiments described above, and for example, both the platen and the printing element may be moved relative to each other during the printing operation, or the printing element may be moved relative to the platen.

In addition, as the printing element, we adopted a golf ball-shaped print head with a large number of print characters on the outer periphery, a badminton shuttlecock-type print head with a large number of print characters on the outer periphery of the opening, and a wire dot-type print head. It can also be embodied in a printing device.

(Effects of the Invention) As described in detail above, the present invention has excellent effects in that it is possible to reduce the impact noise by setting the striking force of the printing element to be weak, and to perform clear printing.

[Brief explanation of drawings]

FIG. 1 is a plan view of a typewriter embodying this invention.
FIG. 2 is an enlarged sectional view of main parts, FIG. 3 is a block diagram showing the electrical configuration of the typewriter, and FIG. 4 is a flow chart. In the figure, 2 is a platen, 3 is printing paper, 12b is a printing element, and 17 is a printing ribbon.

Claims (1)

[Scope of Claims] 1. The printing element (12b) is moved step by step along the printing line of the platen (2), and performs a printing operation each time it is placed at each moving position. In a printing device that prints on printing paper (3) on a platen (2) via a disposed printing ribbon (17), when the printing element (12b) performs a printing operation, the platen (2) or the printing element (12b) ) is moved back and forth by a minute amount relative to the other.