JPS6359877B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ink ribbon feeding mechanism, and relates to an ink ribbon feeding mechanism of an ink ribbon case (ink ribbon cassette) in which a plurality of ink ribbons such as a printing ribbon and a correction ribbon are housed in one case. This relates to the feeding mechanism.

Among printers that use ink ribbons, most printers used for typewriters are equipped with two types of ribbon: a printing ribbon and a correction ribbon for correcting characters printed by mistake. I'm getting used to it. In particular, since typewriters are equipped with two types of ribbons, a printing ribbon and a correction ribbon, there is no need to erase mistakenly printed characters with an eraser, etc., and the correction ribbon can be used in the same position where the mistake was printed. By performing the operation of printing characters, characters printed by mistake can be automatically erased, which is extremely convenient for typewriter users.

However, on the other hand, the printing ribbon feeding mechanism,
The separate correction ribbon feeding mechanism makes the ribbon feeding mechanism quite complex. In particular, serial printers that have a structure in which a ribbon mechanism and a ribbon case are mounted on a carriage have the disadvantage that the carriage becomes large, making the entire typewriter large and expensive. Furthermore, the conventional type has a complicated mechanism, so it is also quite difficult to replace the ribbon.

The purpose of the present invention is to eliminate the above-mentioned drawbacks, and specifically, it is a small and inexpensive ink ribbon constructed in such a way that two types of ribbons are housed in one case so that both can be used freely. To provide a feeding mechanism.

Hereinafter, details of the present invention will be explained with reference to embodiments shown in the drawings.

FIG. 1 and subsequent figures explain one embodiment of the present invention, and FIG. 1 shows the structure of a serial printer's carriage. In the figure, a carriage, designated as a whole by reference numeral 1, has a printing wheel 2 on its front surface, and the printing wheel 2 is rotationally controlled by a motor 3. A mounting plate 5 for pivotally supporting an ink ribbon outer case 4 is provided above the carriage 1. Inside the ink ribbon outer case 4, a solenoid 8 for switching between two types of ribbons, a printing ribbon 6 and a correction ribbon 7, is attached to the upper surface of the carriage with a structure as will be described later. Further, an electromagnetic element 10 is attached to the front upper surface of the carriage 1 to perform printing by hitting the printing wheel 2 against the platen 9, and also to feed the ribbon by operating in the opposite direction. . A hammer 11 slidably attached inside the electromagnetic element 10 moves return levers 12 and 13 for printing operation in a direction opposite to the printing direction to feed the ribbon.

An enlarged view of the ribbon feeding mechanism described above is shown in FIGS. 2 and 5. That is, a lever 13 is rotatably provided in a space formed in front of the ink ribbon outer case 4, and one end of a lever 14 faces the lever 13. The lever 14 is formed into a substantially L-shape, and its bent portion is rotatably supported on a shaft 15.
One end of the torsion coil spring 16 wound around the ink ribbon is engaged with the side wall of the ink ribbon outer case 4, and the other end is
The lever 14 is engaged with a protrusion 14a protruding from one end thereof. Therefore, the lever 14 is given the habit of rotating counterclockwise in FIG.

Along with the lever 14, the pin 18 is inserted with the lever 17 facing the lower side of the lever 14.
It is rotatably attached to the ink ribbon outer case 4 via. This lever 17 has one end facing below the lever 14, and one end of a spring 20 is hooked to a pin 19 protruding from the upper surface of the other end.
Pin 21 protruding from the ink ribbon outer case 4 side
is attracted to.

As shown in FIG. 5, one end of the lever 14 is
It extends in a bent manner to the outside of the ink ribbon outer case 4, and a ratchet 23 is rotatably attached to its tip via a pin 22. pin 22
is wound with a torsion coil spring 24, one end of which is locked to the lever 14 side, and the other end is locked to a pin 23a protruding from the ratchet 23.
Therefore, the ratchet 23 is given a clockwise rotational habit in FIG.
It has a meshing relationship with 5. Ratchet wheel 2
5 is integrally provided with a pulley 26, and a belt 28 is stretched between this pulley 26 and a pulley 27 fixed to one end of a shaft around which the printing ribbon 6 is wound. There is. Therefore, solenoid 8
is not activated and lever 13 and lever 14 face each other,
When the lever 13 is rotated and the lever 14 is rotated, the ratchet wheel 2 is rotated through the ratchet 23.
5 is rotated one pitch, and the belt 28 and pulley 27
The printing ribbon 6 is fed one pitch through the .

On the other hand, as shown in FIG. 5, the lever 17 also extends in a bent manner on the back surface of the ink ribbon outer case 4, and a ratchet 30 is rotatably supported on a pin 29 protruding from the outer surface of the tip thereof. ing.
A torsion coil spring 31 is wound around this pin 29, one end of which is locked to the lever 15.
The other end is locked to a pin 30a protruding from the ratchet 30. Therefore, the ratchet 30 is the fifth
In the figure, a counterclockwise rotational behavior is given. A ratchet wheel 32 is rotatably supported on the side of the lever 17, and a pulley 33 is provided integrally with the ratchet wheel 32. This pulley 33 and a pulley 34 fixed to a shaft around which the correction ribbon 7 is wound
A belt 35 is stretched between the two. Therefore, when the solenoid 8 is actuated, one end of the lever 17 and the lever 13 are opposed to each other, and the lever 17 is rotated by the rotation of the lever 13, the ratchet wheel 32 rotates one pitch via the ratchet 30. Then, the correction ribbon 7 is run one pitch via the belt 35 and pulley 34.

The printing ribbon 6 and the correction ribbon 7 are run vertically in parallel, and during printing, as shown in FIG.
The solenoid 8 is not activated and the ink ribbon outer case 4 is kept horizontally, but the fourth
As shown in the figure, the solenoid 8 is activated and the ink ribbon outer case 4 is rotated via the shaft 36 at the rear end, so that the correction ribbon 7 faces the platen 9.

Next, details of the internal structure of the ink ribbon outer case 4 will be explained. As shown in FIG. 6, the ink ribbon inner case 37 is removably attached in the space above the ink ribbon outer case 4. As shown in FIG. The spool 3 is inside the ink ribbon inner case 37.
8 is accommodated. The spool 38 is structured to be slidable in the axial direction and engageable in the rotational direction with respect to a shaft 39 that is integrated with the front air pulley 27. Further, this shaft 39 is connected to the correction ribbon 7 inside the ink ribbon outer case 4 as shown in FIG.
A supply roll 40 is attached. The supply roll 40 is fitted through a hub 41 into a cylinder 42 which is fitted into a cylindrical portion 4a that is integral with the ink ribbon outer case 4 and which guides the shaft 39.

On the other hand, a disk 43 is fixed to the shaft 39 inside the pulley 27 by a pin 44.
A disc spring 4 is installed between the pulley 27 and the disc 43.
5 is loaded with bullets, a predetermined pressing force is applied to the pulley 27, and the pulley 27 is structured to be able to idle when a load greater than a predetermined load is applied.

On the other hand, in FIG. 7, a spool 50 is fitted within the ink ribbon outer case 4 to the shaft 46 on which the pulley 34 is fitted, while being restricted in the rotational direction. A disk 47 is fixed to the shaft 46 inside the pulley 34 by a pin 48. Disc 47 and pulley 34
A disc spring 49 is loaded between the two. Therefore, like the pulley 27, the pulley 34 is configured to idle when a load of more than a predetermined value is applied.

Further, a shaft 51 integral with the ink ribbon inner case 37 is protruded inside the ink ribbon inner case 37, and a supply roll 53 is connected to the shaft 51 via a hub 52.
However, they are fitted while being restricted in the rotational direction.

By the way, as shown in FIG. 6, a shaft 54 integrated with the pulley 26 extends upward through the ink ribbon outer case 4, and a feed roller 55 for the printing ribbon 6 is fixed to this shaft 54. ing.
A pressure roller 56 is in contact with this feed roller 55. pressure roller 5
6 is rotatably supported on one end of a lever 58 which is rotatably attached to the ink ribbon outer case 4 via a pin 57. The lever 58 is given elasticity by a leaf spring 59 (FIG. 8) so that the pressure roller 56 is pressed toward the feed roller 55. Therefore, the printing ribbon 6 is sent by the frictional force between the feed roller 55 and the pressure roller 56.

Based on the above structure, when the ink ribbon inner case 37 is fitted into the ink ribbon outer case 4 as shown in FIG. Guide member 60 integrally provided on the inner case 37 side
The feed roller 55 and the pressure roller 5 are brought out in contact with guide pins 61 and 62 provided at the tip of the ink ribbon outer case 4.
6 and is wound onto a spool 38.

On the other hand, as shown in FIG. 8, the correction ribbon 7 is led out from the supply roll 40 and guided in contact with a guide member 63 provided integrally with the ink ribbon outer case 4. The ink ribbon passes between a feed roller 64 and a pressure roller 65, which are rotatably provided in the ink ribbon outer case 4 in contact with the guide pins 62 and 61, and is wound onto the spool 50. The pressure roller 65 is the same as the pressure roller 5.
6, it is provided at the tip of a lever 67 rotatably supported via a pin 66, and is pressed against the feed roller 64 by a leaf spring 68.

Since this embodiment is configured as described above,
Since the feeding mechanism for feeding the printing ribbon and correction ribbon separately is housed in one outer case, there is no need to provide feeding mechanisms on the inside and outside as in the past, and the carriage can be made smaller. Also,
Because it has a structure that allows the ink ribbon inner case containing the printing ribbon to be removably fitted, the two
Since different types of ribbons can be easily loaded and unloaded from the carriage at the same time, ribbons can be replaced away from the printer.

Although the above explanation has been given as an example of application to a serial printer, it goes without saying that the invention can also be applied to other types of printers.

As is clear from the above description, according to the present invention, two types of ribbons are housed in one case, and each ribbon is selectively activated by a common biasing means (lever 13 in the embodiment). Since the ink ribbon can be fed, it is possible to obtain a small, lightweight, and inexpensive ink ribbon feeding mechanism with a small number of parts.

[Brief explanation of drawings]

The figures are for explaining one embodiment of the present invention, and FIG. 1 is a side view of the state mounted on a carriage, and FIG.
The figure is a perspective view explaining the ribbon feeding mechanism, Figures 3 and 4 are side views explaining the positional relationship between the platen and the ribbon, Figure 5 is a perspective view seen from the back of the ink ribbon outer case, and Figure 6. 7 is an enlarged sectional view of the main part of the ribbon case, FIG. 7 is a longitudinal side view of the ink ribbon case, FIG. 8 is a cross-sectional plan view of the ink ribbon outer case, and FIG. 9 is an ink ribbon inner case fitted. Transverse plan view of the ink ribbon outer case, 1st
FIG. 0 is a longitudinal side view illustrating the ribbon feeding mechanism. 1... Carriage, 4... Ink ribbon outer case, 9... Platen, 6... Printing ribbon, 7...
...Correction ribbon, 13, 14, 17...Lever,
23,30...Ratchet, 25,32...Ratchet wheel, 26,27,33,34...Pulley, 28,35...Belt, 55,64...
Feed roller, 56, 65...pressure roller.

Claims (1)

[Claims] 1. Winding the first ink ribbon pulled out from the first supply spool onto a first take-up spool;
The second ink ribbon pulled out from the second supply spool is wound onto a second take-up spool, and the first ink ribbon and the second ink ribbon are placed in a case so that they are parallel to each other in the width direction. a first ribbon feeding mechanism for rotating the first take-up spool and a second ribbon feeding mechanism for rotating the second take-up spool; A first driving member for operating the feeding mechanism and a second driving member for operating the second ribbon feeding mechanism are rotated in the case so that they are arranged in parallel in the width direction of the ink ribbon. an ink ribbon cassette that can be supported; and a shifting means for shifting the ink ribbon cassette to a first position where the first ink ribbon faces the printing position and a second position where the second ink ribbon faces the printing position. and when the ink ribbon cassette is in the first position, it is engageable with the first drive member, and when the ink ribbon cassette is in the second position, it is engageable with the second drive member. biasing means disposed at a position such that the ink ribbon cassette is shifted, and biasing means selectively engages with and biases the first drive member or the second drive member; An ink ribbon feeding mechanism characterized in that the first ink ribbon or the second ink ribbon is selectively fed. 2. The biasing means is a lever that operates in conjunction with the return of a hammer for striking the first ink ribbon or the second ink ribbon. ink ribbon feeding mechanism.