JPS59109382A - Ink ribbon cassette - Google Patents

Abstract

PURPOSE:To prevent defective effects, such as poor print and increased loading of cassette shifting mechanism, etc. even if paper material of high rigidity is used, by installing a rotating unit sticking out beyond an ink ribbon in the neighborhood of entrance and exit of an ink-ribbon cassette. CONSTITUTION:In a printing apparatus equipped with a card-holder 8 for connecting tightly a sheet of printing paper 2 onto a platen 1, in the neighborhood of the exit 7'e and 7'f of the ink-ribbon cassette 7' a rotating unit, for example, a pair of cylindrical rollers 7'C and 7'C protruding from the ink-ribbon 6 are provided respectively. By this mechanism, in case of using paper material 2 of high rigidity and increased thickness, by reaction of the paper of this nature, if the card-holder 8 is pushed in a direction of leaving away from the platen 1 and inclined to go back to the side of cassette, the card-holder 8 is stopped by the rollers 7'C and 7'C located at the end of the cassette 7'.

Description

TECHNICAL FIELD The present invention relates to an ink ribbon cassette, and more particularly to an ink ribbon cassette for accommodating an ink ribbon in a printing device equipped with a card boulder for guiding printing paper onto a platen.

2. Description of the Related Art FIGS. 1 and 2 show the conventional configuration of a printer head section of a daisy-wheel printer, which is a printing device using this type of ink ribbon cassette.

The cylindrical body indicated by the reference numeral 1 is a platen that transports the printing paper 2 and also serves as a printing stand. Reference numeral 3 denotes a carriage, which includes a daisy wheel 4 as a printing means and a hammer 5 that hits the daisy wheel 4 during printing;
An ink ribbon cassette (hereinafter referred to as cassette) 7 containing an ink ribbon 6 is mounted, and moves parallel to the platen 1 during printing.

Further, at the frontmost part of the carriage 3 on the platen 1 side, there is a card boulder 8 which is curved along the platen 1 and guides the printing paper 2 so as to be attached onto the platen 1 via a fixing part 9. Fixed.

The cassette 7 is generally U-shaped and has two protruding arms 7a and 7a at the front, each of which is open at its tip, with one serving as an outlet for the ink ribbon and the other serving as an inlet. The ink ribbon 6 is stretched between them. That is, the ink ribbon 6 is stretched over the end surfaces of the arm portions 7a, 7a.

In the daisy wheel 4, a portion of the wheel 7c is arranged between the arms 7a of the cassette 7 and close to the stretched tape 6.

Further, the hammer 5 is located behind the daisy wheel 4 and has an arm portion 7a.
, 7a.

Also, the part whose shape is indicated by a two-dot chain line in the original number 10 in Figure 2 is a ribbon guide, which covers the ink ribbon 6 that runs during printing so that it does not come into contact with the daisy wheel 4. It is arranged so as to sandwich the wheel.

With the above configuration, during printing, the ink ribbon 6 is moved at a predetermined pitch by a printer drive mechanism (not shown), and the ink ribbon 6 is moved at a predetermined pitch by a shift machine (not shown) and a groove.
is shifted upward, and the position of the ink ribbon 6 is lifted from the position shown in FIG. 2 to a position facing the type 4a of the daisy wheel 4.

When using thick and stiff paper, even if the position of the platen 1 is adjusted by the platen manifold to cover the paper thickness, the printing paper 2 that is bent along the platen 1 will not be able to handle the stiffness of the paper. The card boulder 8 is pushed away from the platen 1 by the force of the repulsion.

As a result, the card boulder 6 is warped around the fixed point 9 of the carriage 3'' from the position indicated by a solid line and reference numeral 6 in FIG. 2 to the position indicated by a two-dot chain line and reference numeral 8a.

As a result, since the ink ribbon 6 is stretched overlapping the end surfaces of the arm portions 7a and 7a, the ink ribbon 6 and the card boulder 8 come into contact with each other.
As the ink ribbon 6 runs, the carbon of the ink ribbon 6 is scraped by the card holder 8, which may cause the print to become faint or to be missing.

In addition, due to the contact between the card boulder 8 and the ink ribbon 6, the vertical shaft movement of the cassette 7 during printing cannot be performed smoothly, which increases the burden on the shift mechanism and may cause the shift mechanism to malfunction or be damaged. .

As a countermeasure for the above-mentioned drawbacks, methods have been proposed in which the card boulder 8 is made thicker or a reinforcing metal fitting is provided on the card holder 8 in order to increase the rigidity of the card boulder 8 and make it less likely to warp.

However, especially in a daisy-wheel printer, the distance between the daisy-wheel 4 and the platen 1 cannot be increased due to structural problems, so the thickness of the card boulder 8 cannot be increased.

In addition, reinforcing metal fittings cannot be provided up to the second part of the card holder 8 because it will be difficult for the operator to see the printed characters. Moreover, mounting the reinforcing metal fittings poses a problem when feeding the metal to a high position.

Therefore, neither of the two methods could overcome the conventional drawbacks.

The present invention was made in view of the above points.
In the ink ribbon cassette of the printing device of the type mentioned above,
The purpose of the present invention is to provide an inexpensive and simple configuration that can prevent disadvantages such as printing defects and increased burden on the cassette shift mechanism that conventionally occur when thick and stiff printing paper is used in a printing device. .

EXAMPLES The present invention will be described in detail below based on examples shown in the drawings. In each figure, the same or corresponding parts as in FIGS. 1 and 2 are designated by the same reference numerals, and their explanations are omitted.

FIG. 3 shows a cassette 7' according to the present invention, in which the overall shape of the cassette 7' is approximately U-shaped like the conventional one, and the arm portions 7'a, 7'
However, the tips of the arm portions 7'a and 7/a have a two-step shape with a step, and the outer side of each protrudes.

Cylindrical rollers 7'c, 7'c are rotatably fitted to the protruding portion via their rotation shafts 7'd, 7'd, and the outer circumferences of the rollers 7'c, 7'c are protruding. From the outside 'Jt11 +- is faced.

On the other hand, the retracted inner portions of the tips of the arms 7'a and 7'a are released, and these serve as the lower output '6 and lower input 'f of the ink ribbon 6, and the ink ribbon is inserted between them. 6 is hung. That is, the ribbon 6 is attached to the most advanced rollers 7'c and 7'c of the cassette 7 as shown in FIG.
The suspension is placed at a distance l from the leading edge of the line.

Furthermore, bosses 7'b, 7'b for attachment to the carriage 3 are planted on both sides of the cassette 7'.

Next, the configuration of the printer head section of the daisy-wheel printer equipped with the cassette 7' according to the present invention (FIG. 3) is shown as the fifth factor.

Similar to the conventional configuration shown in FIG. 1, the gear ridge 3 is provided with a card holder 8, and a daisy wheel 4 whose upper H3 is covered and a hammer 5 are mounted on the ribbon guide 1°.

However, at the rear of the carriage 3, there is planted a support base 3a which has a notch that serves as a bearing and has rotatable claws 11 attached to its outer surface, and the cassette 7' is attached to the boss 7c. 7'b, 7'b is the claw 11 on the bearing part of the support base 3a.
It is removably and rotatably fitted through the carriage 3, and is rotatably mounted on the carriage 3.

Also, one arm 7'a of the cassette 7' on the carriage 3
A ribbon solenoid 12 is arranged below (the front side of the beef cow) for pushing up the cassette 7', that is, the ink ribbon 6 during a printing operation.

On the other hand, the force upper door' is always urged downward by a return spring (not shown), and the ink ribbon 6 is shifted up and down via the return lever and the ribbon solenoid.

Lower ink ribbon entry and exit lower part of saw set 7'
The ink ribbon 6 stretched between the card holder 8 and the ribbon guide 10 is inserted between the card holder 8 and the ribbon guide 10. However, when ordinary printing paper 2 is used, as shown in FIG. There is a gap between the outer peripheries of the rollers 7'c, 7'c and the card holder 8, so that they do not come into contact with each other.

With the above configuration, the printing operation is performed in the same manner as in the conventional configuration described above. During printing, the ink ribbon 6 is moved at a predetermined pitch by a drive mechanism (not shown). At the same time, the ribbon solenoid 12 is energized and its drive shaft pushes the cassette 7' and the ink ribbon 6 is shifted to one side.

During this time, if thick and stiff paper is used as the printing paper 2, the stiffness of the printing paper 2 of 7c will result in
Due to the force, the card holder 8 is pushed away from the platen 1 and warped toward the cassette 7', but the card holder 8 is pushed against the rollers 7'c, 7'c at the tip of the cassette 7'.
Uke is stopped.

As shown in FIG. 4, the stretched position of the ink ribbon 6a is retracted by a distance l from the outer periphery of the rollers 7'c, 7'c, so that the card holder 8 and the ink ribbon 6 are
No contact with a.

Also, the card holder 8 and the rollers 7'c and 7/c are 1
Since the friction due to the contact of the river is rolling friction, the load on the ribbon solenoid river 2 that shifts the cassette 7' upwards is not very large.

In the above embodiment, the cassette 7' is provided with a roller 7'c, but it goes without saying that a ball may be provided in place of the roller.

As is clear from the second explanation, according to the present invention, in the ink ribbon cassette of the above-mentioned type of printing device equipped with a card holder, the ink ribbon protrudes from the ink ribbon in the vicinity of the ink ribbon outlet and the ink ribbon inlet. Adopting a configuration with a rotating member prevents printing defects when printing on thick, strong paper and reduces the added burden on the shift mechanism that shifts the ink ribbon up and down. and protect the shift mechanism.

Furthermore, the present invention can be constructed easily and inexpensively by using rollers such as inexpensive molded products.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing the main structure of a daisy-wheel printer equipped with a conventional ink ribbon cassette, Fig. 2 is an explanatory diagram showing the warpage of the card holder due to the printing paper of the printing device shown in Fig. 1, and Fig. 3 is FIG. 4 is an overall perspective view of the ink ribbon cassette according to the present invention, showing the positional relationship between the card holder and the ink ribbon. fT plan view, 5th! FIG. 1 is a perspective view showing the main part configuration of a daisy-wheel printer equipped with a third ink ribbon cassette. 1...Platen 2...Print paper 3...
Carriage 4...Dizzy wheel 5...
Hammer 6... Ink ribbon 7'... Ink ribbon cassette 7'C... Roller 7'e...
Exit 7'f...Inlet 8...Card holder 10...Ribbon guide 12...Ribbon solenoid

Claims (1)

[Claims] Printing of a printing device equipped with a card holder that guides the printing paper onto the platen (= in the ink ribbon cassette that stores the ink ribbon to be used, the vicinity of the ink ribbon outlet and inlet (2. Rotating member that protrudes beyond the ink ribbon) An ink ribbon cassette characterized by being provided with.