JPS62119054A - Ink roll type dot printer - Google Patents

Abstract

PURPOSE:To decrease printing energy and power consumption as well as noise, by a construction wherein the periphery of a drum is separated into a plurality of sections and dot-form projections are disposed at different positions in every section. CONSTITUTION:Dot-form projections 802 are disposed in 12 positions among 14 sections of a sheet 8 so as not to be lined up with each other. When a predetermined dot comes to a printing position 19 for printing, a motor 14 is so energized as to be reversely rotated. At this time, the motor 14 will rotate in the direction of Arrow B, but being securely stopped at the specified place because a non-reverse lever 24 and a ratchet gear 152 are brought into contact with each other. When the motor 14 is brought to a halt, a conduction of a printing coil allows a hammer 6 to press down projections 801 against the sheet 8, which enables printing of the projections 802 on a printing paper 12. Thus, a character can be formed by similarly repeating the printing when a required dot comes to the printing position.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a technique for printing characters on printing paper.

[Prior Art] Conventionally, printers that print characters on printing paper drive needle-shaped pins with electromagnets, etc., and the movement causes them to collide with the printing paper via an ink ribbon, printing dots on the printing paper. Generally, characters are printed based on the structure of the dots.

[Problems to be solved by the invention] Since such printers use an ink ribbon, the ink that has permeated into the ink ribbon must be transferred to the printing paper, so it is necessary to transfer the ink that has penetrated into the ink ribbon to the printing paper. It was necessary to print the pins with a very large amount of energy, resulting in high power consumption. Also, the sound of the paper colliding with the printing paper became louder, resulting in a very loud noise. Furthermore, a mechanism for feeding the ink ribbon is required, which is quite expensive in terms of cost. Furthermore, in the case of ink ribbons, the mesh of the ink ribbon has an adverse effect on printing quality.

The present invention is a mechanism to eliminate such drawbacks, and its purpose is to reduce printing energy and power consumption. Another object of the present invention is to provide a quiet printer by reducing printing noise. Furthermore, it is an object of the present invention to provide an inexpensive printer without the expensive structure of an ink ribbon mechanism. Another objective is to improve print quality, especially clarity.

[Means for Solving the Problems] In the present invention, the outer periphery is divided into a plurality of parts, a dot-shaped projection is provided for each division, and the position of the dot-shaped projection is changed for each division. A drum with a rubber sheet attached is provided, an ink roller is brought into contact with these dot-shaped protrusions to apply ink, and a hammer and an electromagnet work together to press the dot-shaped protrusions from the inside to print dots on printing paper. The protrusions with different dot positions are printed several times so that these dots form characters. By doing this, it is possible to realize a dot printer using an ink roll, which requires less printing energy, and provides a printer that consumes less power, makes less noise, and is inexpensive.

[Example] An example of the present invention will be described using FIG. 1, FIG. 2, and FIG. 3.

FIG. 1 is a perspective view, FIG. 2 is a side sectional view, and FIG. 3 is a plan sectional view.

1 is a frame. Reference numeral 2 denotes a first printing yoke, which is screwed to both ends of the frame 1. The first printing yoke 2 has long strip portions 201 and 202 at both ends, and has a U-shaped yoke portion 203 in the center. A second printing yoke 3 is provided to cover this U-shaped portion. Second
The printing yoke 3 has holes corresponding to the digits, and the holes 301
The printed core 5 is caulked and installed. A printing coil 4 is provided in the U-shaped interior of the first printing yoke 2, a printing iron core 5 is placed in the center hole of the printing coil 4, and a printing suction plate 7 is inserted into a recess 601 provided in the hammer 6. This is the provision. When the printing coil 4 is energized, the printing suction plate 7
is attracted to the printed iron core 5 and moves. At this time, the hammer 6 also moves together with the print suction plate 7.

A sheet 8 and a sheet receiver 9 are rotatably arranged around the first printing yoke 2. The seat receiver 9 has a hole 901 on its outer periphery, and a protrusion 801 provided on the seat 8 fits into the hole 901.

One end of the seat support 9 is rotatably supported by a bearing 10. The bearing 10 is fixed to a long strip 201 at one end of the first printing yoke 2. The sheet 8 has dot-shaped protrusions 802 on its surface, and corresponding protrusions 801 on its back side. The dot-shaped protrusions 802 are provided at 12 positions out of the 14 divisions of the sheet 8, and all of the 12 positions of the dot-shaped protrusions are different from those of the protrusions 801. 4, dot position A311, dot position B812, C813.
, D814, H815, H816, G317, H818
, l819, J820, H821, and H822. When the hammer 6 presses the protrusion 801, the protrusion 802 protrudes and transfers ink to the printing paper 12 along the platen 11. 13 is an ink roll. A motor 14 is directly connected to one end of the seat receiver 9. The protrusion 902 of the seat receiver 9 enters the recess 151 of the outer case 15 of the motor 14, and the rotation of the motor 140 is directly transmitted to the seat receiver 9.

The motor 14 includes a motor coil frame 16, a motor yoke 17, a motor magnet 18, an outer case 15, and a motor magnet yoke 20. This is a so-called outer rotor type step motor. The motor coil frame 16 is fixed to the long strip 202 of the first printing yoke 2, and also serves as a bearing for the outer case 15. Two-phase coils are wound around the motor coil frame 16, resulting in a total of four coils. When a predetermined pulse of electricity is applied to these coils, the outer case 15, motor magnet 18, and motor magnet yoke 20 are integrated. It rotates. Ratchet teeth 152 are provided on the outer periphery of the outer case 15, and the lever 24 for preventing reverse rotation is provided with ratchet teeth 152.
, so that it rotates in the direction of arrow A, but not in the direction of arrow B. (See Figure 8). 2
2 is a paper feed rubber, and 23 is a paper feed gear.

When the intermittent teeth 903 provided on the sheet receiver 9 mesh with the paper feed gear 23, the paper feed rubber 22 rotates by a predetermined angle and feeds the printed paper 12 by a certain amount.

Reference numeral 25 denotes a reset spring, which serves as a mechanical contact point, and is activated by a cam 904 provided on the seat receiver 9 to generate a reset spring per rotation of the seat receiver 9.
A reset pulse is issued once.

The arrangement of the protrusions 802 on the sheet 8 is shown in FIG.

The sheet 8 is shown in an unfolded state, with the vertical axis indicating the position and the horizontal axis indicating the digit. The protrusions 802 are arranged in a staggered manner,
One hammer width has a width of two digits, and one hammer can control two digits of width. motor 14
When the is rotated in the direction of arrow A, printing position 19 starts with "Space 3", then "Space 4" and "Position 1" are printed.
” “Position 2” and so on. This relationship is expressed in the position column of the time chart in FIG. To explain the relationship between dot positions and positions, in the case of the first digit, position 1 has dot position A3.
11, dot position B812 is provided at position 3, dot position C813 is provided at position 5, and dot positions DEFGHIJKL are provided at positions 7.9, 11, 13°, 15.17, 19, and 21.23, respectively. There is. Also, in the case of the second digit, position 2 has dot position A3.
11 is at position 4, dot position B812 is at position 6.8, 10, 12, 14, 16°18.20
, 22 and 24, respectively, dot positions CDEFGHIJK
L is provided.

The operation of the mechanism having the above configuration will be explained.

First, the position of the space 3 of the sheet 8 is at the position facing the hammer 6 (printing position 19). Here, the motor 14 is energized and rotated in the direction of arrow A. The energization mode of the motor 14 is to energize the four coils of the motor 14 as shown in the time chart in Figure 6.
As shown in the figure, motor coil (1) to motor coil (4)
The state of pulses applied to transistors (1) to (4) connected to is shown. The motor energization mode number 915462A8 shown in the time chart (FIG. 6) will be explained. 9 energizes motor coils (1) and (4); 1 energizes motor coil (1); 5 energizes (1) and (3); 4 energizes (3);
), 6 is (2) (3), 2 is (2), A is (2) (4)
, 8 means that each of (4) is energized.

Here, in order for the motor 14 to rotate normally, the motor energization mode 915
It is sufficient to energize in the order of 46'2A8. Also, the relationship between the energization mode and the position of the motor 14 is shown in FIG. 5. If the odd number is excited by A, and the even number is excited by 5, the printing position 1
A predetermined dot is placed at 9. Print position 19
If you want to print when a predetermined dot arrives on the
The energization mode is such that the motor 14 is energized in the reverse direction. At this time, the motor 14 tries to rotate in the direction of arrow B, but
The anti-reverse lever 24 and the ratchet teeth 152 come into contact with each other, and the motor 14 is reliably stopped at a predetermined position. This motor 1
If the printing coil is energized with the printing coil 4 stopped, the hammer 6 presses the protrusions 801 on the sheet 8 and the protrusions 802 can be printed on the printing paper 12.

Similarly, when the necessary dots arrive at the printing position, they are printed several times to form a character. For example, if you want to print 1 as shown in Figure 11, dot position B in Figure 4.
812, H815, H816, H818, J820, H
It is sufficient to print when 821 and H822 come to the printing position.

When the position where no printing is to be reached comes, the motor 14 is moved as it is.
continues to rotate in the direction of arrow A. When the position reaches "position 24", the dot selection printing ends. When the motor 14 is further rotated, the intermittent teeth 903 provided on the sheet receiver 9 mesh with the paper feed gear 23 to feed the paper. A reset pulse is issued during this paper feeding.

Since this structure is directly connected to the motor 14 and the sheet 8, when the motor 14 is stopped for printing, the sheet receiver 9
It can also be stopped.

Furthermore, when the motor 14 is stopped for printing, it is energized so that it rotates in reverse, and at this time, the reverse movement of the motor 14 is quickly stopped at a predetermined position by the reverse stop plate 24 and the ratchet teeth 152. Therefore, the seat receiver 9 can also be stopped.

As shown in Fig. 7, this is the conventional motor 14 as shown by the broken line.
The movement becomes as shown by the solid line, and the motor 14 is stopped for a short time t.

When the motor 14 is stopped for printing, a mode of energization that gives reverse rotation is performed, but in the present invention, this mode of energization is continuously turned ON and OFF, and the consumption of the motor 14 at this time is The average current is as shown in FIG. 8, which is much smaller than the current value (indicated by the broken line) in the case of the always-ON state.

[Effects of the Invention] According to the present invention, the outer periphery is divided into a plurality of parts, and a rubber-like sheet is provided with dot-shaped protrusions whose positions are changed for each division, and an ink roller transfers ink to the dot-shaped protrusions. By printing dot-like protrusions many times, it is possible to print characters with a dot configuration. Therefore, the energy required for transfer can be extremely small by using an ink roll. Also, since the rubber sheet is interposed in the collision during printing, the noise is very low. Furthermore, since the dot I printer is realized using an ink roll, there is no need for a complicated feeding mechanism such as an ink ribbon, and the ink roll itself is inexpensive, resulting in a very inexpensive printer.

Furthermore, transferring ink applied to rubber dots onto printing paper provides much better print clarity and quality than transferring ink to printing paper via an ink ribbon.

[Brief explanation of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a side sectional view,
FIG. 3 is a plan sectional view. FIG. 4 is a diagram showing the positional relationship of dot-shaped protrusions in an embodiment of the present invention. FIG. 5 is a developed diagram of the character arrangement of C I in the embodiment of the present invention. FIG. 6 is a time chart 1 of an embodiment of the present invention. FIG. 7 is a diagram showing the movement of the motor in the embodiment of the present invention. FIG. 8 is a diagram showing the amount of current consumed by the motor according to the embodiment of the present invention. FIG. 9 is a diagram showing ratchet teeth and reverse rotation prevention means in an embodiment of the present invention. FIG. 10 is a diagram showing a circuit for driving a motor according to an embodiment of the present invention. FIG. 11 is a diagram showing an example of printing according to an embodiment of the present invention. 1...Frame 2...First printing yoke 3...Second printing yoke 4...Printing coil 5...・Printing iron core 6---・8 Itinerary hammer 7・・・・・・Printing suction plate 8・・・・・・・・・Sheet 9・・・・・・・Sheet receiver 10・・・・・Printing Bearing 11...Platen 12...Printing paper 13...Ink roll 14...Motor 22...Paper feed rubber 23...・・Paper feed gear 24 ・・・Return stopper lever 25 ・・・Reset spring 152 ・・・Ratchet teeth 802 ・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・・ ・ ・ ・ ・ . . . . . . . . . . . . . . . Mackerel M Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] a drum whose outer periphery is divided into a plurality of parts and a rubber-like sheet with dot-like protrusions provided for each division is attached to the outer periphery; a printing means comprising an electromagnet and a hammer that performs printing by pressing from the inside of the drum; a motor that drives the type drum;
It consists of an ink roller that contacts the outer periphery of the drum and applies ink to the dot-shaped protrusions, and a platen that is placed opposite the drum. An ink roll type dot printer characterized by changing the position of dot-like projections each time.