JPS629036B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a small printer used for, for example, an electronic cash register (hereinafter abbreviated as ECR), and its purpose is to print data with the same content on two continuous sheets of paper. The object of the present invention is to provide an extremely small, lightweight, inexpensive, and simple printing device that can print simultaneously.

Generally, in ECR, the same data is printed on two sheets of paper at the same time, one is used as a paper to hand to the customer (receipt), and the other is used as paper for storage in the store (journal). Paper is typically stored in rolls.

By the way, in this type of conventional ECR printing device, two printing devices are driven by the same printing control signal to print the same print data on two sheets of paper at the same time, or one device can print two sheets of paper at the same time. Even if it is possible to print on several sheets of paper at the same time, it is extremely large and
In addition to being heavy, the mechanism was complicated and expensive.

For this reason, a single printing device uses plain paper and pressure-sensitive paper, and print data is recorded using an ink ribbon on the plain paper used as a receipt, while copying data is recorded on the pressure-sensitive paper used as a journal. Attempts have been made to simplify the printing device by adopting a structure for printing, but the pressure-sensitive paper used as the journal is expensive and is easily stained by inadvertent pressure.

Furthermore, since most of the conventional printers use an ink ribbon as the printing medium, the life of the ink ribbon is short and the print quality is not very good.

The present invention was developed in view of the above points, and uses plain paper of normal thickness that does not require high running costs, an ink sponge that has extremely excellent ink life and printing quality, and a single DC motor. The present invention provides a compact, lightweight and simple ECR printing device that uses only one drive source and two small trigger electromagnets.

The details of the present invention will be explained below with reference to an embodiment shown in FIGS. 1 to 3.

In the figure, reference numeral 1 denotes a type wheel spindle rotatably held between frames 2A, 2B, and 2C, which has an approximately oval cross section, and has thick diameter portions 1a, 1a-A as shown in FIG.
Narrow diameter portions 1b, 1b-A, 1b-C and step portion 1
c, 1c-A.

The narrow diameter portions 1b, 1b-C of the type wheel shaft 1 protrude by a predetermined amount to the right side of the frame 2A and to the left side of the frame 2C, and a ratchet 3 is fixed to the projected narrow diameter portion 1b, and a gear is attached to the narrow diameter portion 1b. 4 and 5 are mounted so as to be rotatable separately relative to the type wheel axle 1, and gears 4-A and 5-A are mounted on 1b-C so as to be rotatable separately relative to the type wheel axle 1. It is installed as shown. Reference numeral 6 denotes a first clutch means provided between the gear 4 and the ratchet 3 (namely, the type wheel shaft 1), which controls rotational transmission between the gears 4 and 1. 7 is a second clutch means provided with a cam groove 7a on the outer periphery;
It is located between the gears 4 and 5, and controls rotation transmission between the gears 4 and 5. 7-A has a cam groove 7a on the outer periphery.
The third clutch means provided with A controls the rotation of gear 5-A and gear 4-A.

Reference numeral 8 denotes a first electromagnet, which drives an actuating rod 9 that controls the two clutch means 6 and 7;
One end 9a is connected to the ratchet 3, and the other end 9b
are capable of engaging with the cam grooves 7a, respectively. When one end 9a of the operating rod 9 is engaged with the ratchet 3, the other end 9b is separated from the cam groove 7a, and conversely, the other end 9b is engaged with the cam groove 7a.
When the operating rod 9 is engaged with the cam groove 7a, the one end 9a functions as a so-called mechanical flip-flop that separates from the ratchet 3, and when the operating rod 9 is engaged with the cam groove 7a, the gear 4 and the type wheel shaft 1 (the ratchet 3)
When the operating rod 9 is engaged with the ratchet 3, the gears 4 and 5 rotate together, and the gears 4 and 5 become unable to transmit rotation. Rotation cannot be transmitted to the type wheel shaft 1.

8-A is a second electromagnet that drives an operating rod 9-A that controls the third clutch means 7-A, and the operating rod 9-A is engageable with the cam groove 7a-A. There is. Then, the operating rod 9-A is connected to the cam groove 7a-A.
When engaged with gear 4-A and type wheel shaft 1
are in a state of rotating together, and on the other hand, the operating rod 9
When A is not engaged with the cam groove 7a-A, the gears 4-A and 5-A rotate together, and
The gear 4-A and the type wheel shaft 1 are unable to transmit rotation.

10 is a DC motor that always rotates in one direction, gears 11, 11-A attached to its shaft 10-a mesh with the gears 4, 4-A, and the rotation of the motor 10 is caused by the rotation of the gears 4, 4-A. is alternatively transmitted to the type wheel set 1 and the gear wheels 5, 5-A.

12, 12-A is a hammer drive shaft supported between frames 2A, 2B, and 2C, and cam 1 for driving the hammer.
3... is installed.

14, 4-A is a gear attached to the hammer drive shaft 12, 12-A, and meshes with the gear 5, 5-A.
15, 15-A is a hammer shaft pivotally supported between frames 2A, 2B, and 2C, and each hammer body 16, 1 has a striking surface 16a, 16a-A extending over the printing width of one line.
6-A is installed.

17, 17-A is a guide shaft with a non-circular cross section for carriage transfer, which will be described later, which is supported between the frames 2A, 2B, and 2C, and the gears 18, 18-A attached to the ends are connected to the gears 5, 5-. meshes with A. 19,19-A
is a rack shaft held between frames 2A, 2B, and 2C so as to be rotatable by a predetermined amount, and to which racks 20, 20-A for carriage transfer are attached. 2
1,21-A is a carriage, its base 21a,
The guide shafts 17, 17-A are inserted into the circular holes 21a-A (see FIG. 2), and the carriages 21, 2
1-A is capable of sliding on guide shafts 17, 17-a. 22, 22-a are the base parts 21a, 2
The guide shaft 1 is a screw body that is rotatably held so that it does not fall out below 1a-A.
The screw body 22, 22-A has a so-called spline shaft connection that rotates integrally with the screw body 7, 17-A and is slidably held in the axial direction. The above mentioned rack 2
0,20-A meshes. The screw body 22,
Although the toothed portion of 22-A is not shown, half the circumference of the toothed portion is formed in the circumferential direction, and the remaining half of the circumference is formed in a spiral shape, and the first half of the guide shaft 17, 17-A rotates a half turn. In this case, the spiral teeth of the screw bodies 22, 22-A and the racks 20, 20-A do not mesh with each other, and the guide shaft 1
7,17- Screw body 2 in the second half rotation of A
2,22-A spiral teeth and rack 20,20-
A meshes with the screw bodies 22, 22-A, that is, the carriages 21, 21-A are transferred by an amount equivalent to one digit.

23, 23-A is a second type wheel for numerical symbols, and the thick diameter portion 1 of the type wheel shaft 1 provided at its center
The type wheel shaft 1 is inserted through a substantially oval-shaped hole (not shown) that coincides with the cross section a, 1a--A, and rotates integrally with the type wheel shaft 1. -A and the narrow diameter portions 1b, 1b-A. Also, this second type wheel 23, 23-
Insert the carriage 2 into the annular groove A (not shown).
The arms 21b, 21b-A of 1, 21-A are engaged (see Fig. 2), and the carriage 21, 2 is rotatably held by the carriage 21, 21-A.
Transported together with 1-A.

24,24-A is the first for function symbol
Insert the thin diameter portions 1b, 1b-A into a substantially oval-shaped hole (not shown) that matches the cross section of the narrow diameter portions 1b, 1b-A of the type wheel shaft 1 provided at the center of the type wheel. It rotates integrally with the type wheel shaft 1, and
It slides only on the narrow diameter portions 1b and 1b-A of the type wheel shaft 1. 25, 25-A has one end connected to carriage 2.
1, 21-A, the other end of which is attached to the frames 2B, 2C, is used to constantly move the carriages 21, 21-A in the right direction in FIG. 1 (i.e.,
When the carriages 21, 21-A return to the home position, the racks 20, 20
-A rotates and disengages the racks 20, 20-A from the screw bodies 22, 22-A, thereby acting to rapidly return the carriages 21, 21-A to the home position. do. 2
6, 26-A is a second spring attached to the type wheel shaft 1 between the frames 2A, 2B and the first type wheels 24, 24-A, and is used to rotate the first type wheels 24, 24-A. Always press to the left in Figure 1.

In the waiting state for starting printing for one line shown in the first figure, the spring force of the first springs 25, 25-A is set larger than the spring force of the second springs 26, 26-A. As a result, the second type wheel 23, 23-A
presses the cylindrical portions 24a, 24a-A on the side surfaces of the first type wheels 24, 24-A, and the first type wheels 2
4, 24-A to face the striking surfaces 16a, 16a-A of the hammer bodies 16, 16-A, and the second type wheels 23, 23-a to face the striking surfaces 16a, 16a-A of the hammer bodies 16, 16-A.
- Notches 16b and 16b provided in A are opposed to A. The notches 16b, 16b-A provided in the hammer body 16, 16-A are used for the carriage 21,
Masks 27 and 27-A made of elastic thin metal plates are arranged opposite to the notches 16b and 16b-A and have a width approximately corresponding to the moving distance of one digit of the mask 21-A.
is arranged. The masks 27, 27-A have a width substantially equal to the width of the notches 16b, 16b-A, and the hammer bodies 16, 16-A and the masks 27, 27
- Printing paper 28, 28-A interposed between
When the hammer body 16, 16-A is activated, the mask 27, 27-A prevents unnecessary printing by the printing paper 28, 28-A.
It is housed in the notches 16b, 16b-A together with a part of the .

29, 29-A is the carriage 21, 21-
Two sets of type wheels 24, 24- are attached to A.
An ink supply means for supplying ink to A and 23, 23-A, which includes an ink roller 30, 30-A impregnated with ink, and the ink roller 30, 30
- A is pivotally supported and the carriages 21, 21-A
Ink roller cover 3 detachably attached to
1, 31-A and ink roller cover 31, 31
-A to press the ink rollers 30, 30-A to elastically contact the type wheel. In addition, in FIG. 2, 33, 33-A,
34, 34-A are stoppers, and the stoppers 33, 33-A, 3 are connected by springs (not shown), respectively.
This is to prevent the hammer bodies 16, 16-A and the racks 20, 20-A from moving, to which rotational force is applied in the direction 4, 34-A.

Next, a printing operation using the above-described configuration will be explained.

In the return state of the carriages 21 and 21-A in FIG. 1, that is, in the waiting state to start printing one line,
As described above, the first type wheels 24, 24-A are the striking surfaces 16a, 16a- of the hammer bodies 16, 16-A.
The second type ring 23, 23-A faces the mask 27, 27-A. Further, the operating rods 9, 9-A of the electromagnets 8, 8-A are pressed by a spring (not shown), and the cam grooves 7a, 7a-A of the second and third clutch means 7, 7-A are pressed. The rotation of the motor 10 is therefore controlled via the gear 4, the first clutch means 6, the type wheel set 1 and the ratchet 3.
is in a state where it can be transmitted.

When the motor 10 rotates in this state, the type wheel shaft 1 rotates as described above, rotating each of the two sets of type wheels 24, 24-A and 23, 23-A. During the first rotation, each of the two sets of type wheels 2 is
4, 24-A and 23, 23-A, apply ink to the printed symbol portions on the outer periphery. And the type wheel 23,
During the next rotation of 23-A and 24, 24-A, the electromagnets 8, 8A operate based on the printing command, and the operating rods 9, 9-A operate the second and third clutch means 7, 7-. At the same time as the cam grooves 7a, 7a-A of
, the first clutch means 6 is turned off, and rotational transmission between the type wheel set 1 and the motor 10 is interrupted. Therefore, the type wheel set 1 stops and the first
The type wheels 24, 24-A of the hammer bodies 16, 16-A hit the striking surfaces 16a, 24-A of the desired function symbols.
16a-A and stop. Although the excitation of the electromagnets 8, 8-A for selecting the type mentioned above is temporary, the operating rods 9, 9-A are connected to the cam grooves 7a, 7a-A of the second and third clutch means 7, 7-A. When the motor 10 is disengaged from the clutch, the rotation of the motor 10 is immediately transmitted to the second and third clutch means 7, 7-A and the gears 5, 5-A via the gears 4, 4-A, as described above. Second and third clutch means 7, 7
- With the rotation of A, the operating rods 9b, 9 are biased toward the second and third clutch means 7, 7-A by springs.
-A is in elastic contact with the cylindrical outer peripheral surface of the clutch means 7, 7-A, and the next cam grooves 7a, 7a-A of the second and third clutch means are opposed to the operating rods 9b, 9-A. Until the actuating rods 9b, 9-A are depressed, one end 9a of the actuating rod 9 engages with the ratchet 3 to turn off the first clutch means 6 (rotation cannot be transmitted) and to 3, clutch means 7, 7
- A is in the ON state (rotation transmission is disabled).

Therefore, with the first type wheels 24, 24-A stopped facing the striking surfaces 16a, 16a-A,
The rotation of the motor 10 is transmitted to the gears 5, 5-A,
Gears 14, 14-A meshing with the gears 5, 5-A
The gears 18, 18-A are also rotated to rotate the hammer drive shafts 12, 12a-A and the guide shafts 17, 17.
- Rotate A synchronously. Hammer drive shaft 12, 12
- When A rotates, in the first half of the rotation, the protrusion 13-a of the hammer driving cam 13 (see Figure 2)
presses the back surface of the hammer bodies 16, 16-A, causing the hammer bodies 16, 16-A to rotate around the hammer shafts 15, 15-A. Therefore, the striking surfaces 16a, 16
a-A is pressed against the first type wheel 24, 24-A via the printing paper 28, 28-A (see FIG. 2), and a desired function symbol is written at the last position of the printing paper 28, 28-A. Print. During this time, the guide shafts 17, 17-A are also connected to the hammer drive shafts 12, 12-A.
However, as mentioned above, the guide shaft 1
In the first half rotation of 7, 17-A, the spiral teeth of the screw bodies 22, 22-A become loose 20,
20-A does not mesh with the hammer body 16 described above,
After the rotation of the guide shafts 17, 17-A is completed (although not shown, the hammer bodies 16, 16-A automatically return to the non-printing position by the spring).
Screw body 22, 22-A in the second half rotation of A
The spiral teeth of the racks 20, 20-A are engaged with each other, and the carriages 21, 21-A are moved through the first springs 25, 25-A by an amount equivalent to one digit. The type rings 24, 24-A are the masks 2
7,27-A.

Along with this, the second type wheel 23, 23-A
is separated from the position facing the masks 27, 27-A and hits the striking surfaces 16a, 1 of the hammer bodies 16, 16-A.
Move to the position opposite 6a-A. Drive of the hammer bodies 16, 16-A and the carriage 21,
When the transfer of one digit of 21-A is completed, in other words, the hammer drive shafts 12, 12-A and the guide shaft 1
When the clutch 7, 17-A completes one rotation, the second and third clutch means 7, 7-A rotating synchronously with the clutch 7, 7-A rotate half a rotation, and the second and third clutch means 7, 7-A The cam grooves 7a, 7a-A reach the position facing the operating rods 9, 9-A, and the operating rods 9, 9-A pressed by the springs fall into the cam grooves 7a, 7a-A, and the operating rods One end 9a of the clutch 9 disengages from the ratchet 3, turning the first clutch means 6 on and the second and third clutch means 7, 7-A off. Therefore, the rotation of the motor 10 is transmitted only to the type wheel shaft 1, and the rotation of the motor 10 is transmitted to the type wheel shaft 1 of each of the two sets.
3, 23-A and 24, 24-A return to the rotating state again. In this state, as described above, the electromagnets 8, 8-A are excited based on the subsequent printing command to select type, drive the hammer bodies 16, 16-A,
The carriage 21, 21-A is transferred for one digit, and the second type wheel 23, 2 is transferred to the second digit from the last position.
3-A, the desired numerical symbol is printed at a predetermined distance from the function symbol on the printing paper 28, 28.
-A, and the carriages 21, 21-A are further transferred to the upper digit side. At this time, the first type ring 24, 24-A is connected to its cylindrical portion 24a, 24a-A.
is in contact with the stepped portions 1C and 1C-A of the type wheel shaft 1, so that it is prevented from moving further in the direction of the upper digits and remains in the position facing the masks 27 and 27-A, and from this point on, Only the second type wheel is transported together with the carriages 21, 21-A, and the printing paper 2
Numerical symbols are printed in order from the lower digits to 8,28-A. When one line of printing is completed, the carriages 21, 21-A return command causes the racks 20, 20-A to be rotated by appropriate electromagnetic means, and the racks 20, 20-A and the screw body 22,
22-A and remove the engagement with the carriages 21, 21.
-A is returned to the home position by the tensile force of the first springs 25, 25-A, the first and second type wheels 24, 24-A and 23, 23-A
returns to the state shown in the first diagram and prepares to print a new line. Thereafter, if printing is performed for each line in the same manner, desired print data can be obtained.

The above is a case where printing is performed on two sheets of printing paper 28, 28-A, but for example, when printing on only one sheet of printing paper when receipt issuance is stopped in ECR etc., the above-mentioned 3. By turning off the clutch means 7-A (that is, turning off the electromagnet 8-A), the hammer drive shaft 12-A and the guide shaft 17-A become unrotatable, and the hammer body 16-A becomes unrotatable, as described above. Rotation of A and carriage 21-A are not carried out. Therefore, no printing is performed on the second printing paper 28-A.

As detailed above, according to the present invention, it is possible to selectively print on two sets of printing paper with a single motor.
Therefore, a compact two-seater printer with a simple mechanism can be provided, which is of great value.

[Brief explanation of the drawing]

The drawings all relate to one embodiment of the present invention; FIG. 1 is a partially simplified plan view, FIG. 2 is a sectional view of the main part,
FIG. 3 is a perspective view of the type wheel shaft. 1... Type wheel shaft, 1C, 1C... A step part (stopper means), 3... Ratchet, 4, 4-A, 5, 5
-A...Gear, 6...First clutch means, 7...Second
clutch means, 7-A... third clutch means,
8...First electromagnet, 8-A...Second electromagnet, 9...
First operating rod, 9-A... Second operating rod, 10... Motor, 12, 12-A... Hammer drive shaft, 13... Cam, 14, 4-A... Gear, 15, 15-A... Hammer shaft , 16, 16-A...hammer body, 16a, 16
a-A...beating surface, 16b, 16b-A...notch,
17,17-A...Guide shaft, 18,18-A...Gear, 19,19-A...Rack shaft, 20,20-A
...Rack, 21, 21-A...Carriage, 22,
22-A...Screw type, 23,23-A...Second
Type wheel, 24, 24-A...first type wheel, 2
5,25-A...first spring, 26,26-A...second spring, 27,27-A...mask, 28,28
-A...Printing paper.

Claims (1)

[Claims] 1. Two serial printers are installed side by side in which motors selectively drive the type wheel shaft, the hammer drive shaft, and the drive shaft of the carrying screw body through clutches, and the two serial printers are driven by a single motor. At the same time, the type wheel shafts of the two serial printers are made a common shaft, and each serial printer is individually provided with a clutch for transmitting rotation from the motor to the hammer drive shaft and carry screw body drive shaft. , a printing device characterized in that it is configured to drive two serial printers simultaneously or to drive only one of them.