JPS5912200Y2 - dot printer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a dot type printer in which the dot head is moved back from the platen when replacing the ribbon cassette.

In general, in dot-type printers, the gap between the head tip and the platen is extremely small, around 0.5 mm. Therefore, when replacing the printer's ink ribbon, with conventional printers, the head does not retreat relative to the platen, so the ribbon is inserted. It is very time-consuming to do so, and since the ribbon is manually inserted into a ribbon guide provided at the tip of the head, there is also the disadvantage that the ribbon gets dirty on the hands.

In addition, after inserting the ribbon, it is necessary to visually check whether the ribbon is properly placed in the ribbon guide, and then to feed the ribbon by hand by turning the knob on the ribbon cassette in order to eliminate the slack in the ribbon. Replacing the ribbon cassette was quite troublesome.

The present invention was developed in view of the above circumstances.The head mounting base for fixing the dot head is mounted so as to be movable back and forth in the platen direction. The object of the present invention is to provide a dot-type printer in which the ribbon cassette can be easily replaced, and the ribbon cassette does not stain hands.

Embodiments of the present invention will be described below with reference to the drawings.

In the figure, reference numeral 1 denotes a platen part, whose both ends are rotatably supported by a frame 3 via a shaft 2.

On the other hand, a support plate 4 fixed to the frame 3 has a head support shaft 5 that penetrates and is fixed to the support plate 4, and a head support shaft 5 that is slidably inserted into a long hole 6 bored in the support plate 4. Head support shafts 7 are provided at a predetermined distance from each other and parallel to the platen portion 1.

A long hole 10 through which the head support shaft 5 is slidably inserted and an insertion hole 11 through which the head support shaft 7 is slidably inserted are bored at both ends of the head mount 9 on which the dot head 8 is placed and fixed. , each of the head support shafts 5 is inserted into these elongated holes 10 and through holes 11.
, 7 are inserted therethrough, and the head mounting base 9 is supported so as to move parallel to the platen portion 1.

Further, the head mount 9 is movable back and forth in the platen direction through the head support shafts 7 and 5 within the elongated hole 6 provided in the support plate 4 and the elongated hole 10 provided in the head mount 9. Supported.

The other end of a coil spring 13, which has one end secured to a protrusion 12 protruding from the support plate 4, is secured to one end of the head support shaft 7. The head mount 9 is biased rearward with respect to the platen portion 1.

A cassette guide 15 on which a ribbon cassette 14 is hung is fixed to the frame 3 behind the head mount 9.

As shown in FIG. 2, the ribbon cassette 14 is provided with an integral oval-shaped claw 16 on its back surface to be hooked to the cassette guide 15, and has an engaging hook 16 drilled in the cassette guide 15 at its tip. Retaining convex portion 1 that engages with concave portion 17
8 is installed protrudingly.

Further, on the front surface of the ribbon cassette 14, a pressing piece 19 having elasticity that presses the head support shaft 7 toward the platen when the ribbon cassette 14 is loaded is provided.

Furthermore, cassette arms 21, 21 for guiding the ink ribbon 20 within the cassette 14 are protruded from both ends of the ribbon cassette 14.

The length of the cassette arms 21, 21 is such that when the claw 16 of the ribbon cassette 14 is hooked to the cassette guide 15 and the ribbon cassette 14 is loaded, the tips 22, 22 of the cassette arms 21, 21 are The ribbon guide 23 attached to the tip of the head mount 9 is set to be located between the maximum forward position and the maximum backward position with respect to the platen direction.

The head mounting base 9 is configured to reciprocate at a constant speed parallel to the platen section 1 by a carriage mechanism (not shown), and the platen section 1 is moved by a line feeding mechanism (
(not shown).

According to such a configuration, when the ribbon cassette 14 is not loaded, the mounting base 9 (as shown in FIG. 3a)
is moved backward in the platen direction due to the biasing force of the coil spring 13, so a large gap is created between the ribbon guide 23 provided at the tip of the head mount 9 and the platen portion 1.

Next, insert the ink ribbon 20 in the ribbon cassette 14 as shown in FIG.
As shown in FIG.
．． 22, the claw 16 of the ribbon cassette 14 is hooked to the cassette guide 15, and the retaining protrusion 18 provided at the tip of the claw 16 is engaged with the engagement recess 17 of the cassette guide 15 to complete the ribbon cassette. When the ribbon cassette 14 is loaded, the pressing piece 19 protruding from the ribbon cassette 14 presses the coil spring 1.
In order to press the head support shaft 7 against the biasing force of 3, the head mount 9 advances toward the platen as shown in FIG. The distance is maintained and set.

At the same time, the ink ribbon 20 is stretched by the ribbon guide 23 and set in a printable state.

Therefore, before loading the ribbon cassette 14, the dot head tip 8a is largely retracted from the platen 1, so it is extremely easy to insert the ink ribbon 20.
In addition, cassette arms 21 are attached to both ends of the ribbon cassette 14.
, 21 are provided, and the ribbon guide 23 stretches the ink ribbon 20 when the ribbon cassette 14 is loaded, so there is no need to eliminate slack in the ink ribbon 20.

As described above, in the present invention, the head mount for fixing the dot head is mounted so as to be movable back and forth in the platen direction, and when the ribbon cassette is attached or removed, the head mount is moved backward, and after loading, the head mount is moved forward. In addition, a pair of cassette arms are provided protruding from the ribbon cassette to the platen to guide the ribbon, making it extremely easy to insert the ink ribbon between the head tip and the platen. To provide a dot type printer in which a ribbon cassette can be easily replaced without having to hold and insert the ribbon cassette.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing an embodiment of the present invention, Fig. 2 a,
1) is a top view and a side view of the ribbon cassette of the same embodiment, and FIGS. 3a and 3) are explanatory views of the same embodiment. 1...Platen section, 3...Frame,
6...Elongated hole, 7...Support shaft, 8
...Dot, head, 9...Head mounting base, 13...Spring, 14...
Ribbon cassette, 19... Pressing piece, 21...
...Cassette arm.

Claims (1)

[Scope of utility model registration request] A frame for rotatably supporting the platen, a dot head placed opposite to the platen, a dot head mounting base for mounting and fixing the dot head, and a dot head mounting base for guiding the dot head mounting base in a direction parallel to the platen. and a support shaft that passes through an elongated hole formed in the frame and is supported by the frame and moves the dot head mounting base back and forth in the direction of the platen within the longitudinal range of the elongated hole. A spring that biases the mounting base in the direction away from the platen, a ribbon cassette that is removably installed on the frame on the side that sandwiches the dot head and faces the platen, and a ribbon cassette that protrudes from the ribbon cassette toward the platen and carries the ink cartridge. and a pair of cassette arms for guiding, and when the ribbon cassette is mounted, a part of the ribbon cassette comes into contact with the front support shaft to advance the dot head mounting base toward the platen against the biasing force of the spring. A dot-type printer characterized by the following features: