JPH078225Y2 - Ribbon cassette holding device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a ribbon cassette holding device.

2. Description of the Related Art First, a conventional example is shown in FIGS. Reference numeral 1 denotes a ribbon base. The ribbon base 1 is provided with a guide groove 2 whose rear end is opened in an expanded state, and a bending piece 3 which is a locking portion. 4 is a ribbon cassette. The ribbon cassette 4 is a flat cassette case 5 in which a long ink ribbon 6 is housed, and a ribbon feeding mechanism is built in one side of the cassette case 5. Reference numeral 7 is a winding shaft that constitutes one part of the ribbon feeding mechanism. Has been formed. Further, a pair of left and right arms 9 for pulling out the ink ribbon 6 are provided on both sides of the front portion of the cassette case 5. Further, on both sides of the rear side of the rear surface of the cassette case 5, there are projections 10 slidably held in the guide grooves 2 and members for elastically engaging the bending pieces 3 and contacting the rear surface of the ribbon base 1. The pawl 11 is integrally formed. These locking claws 11
The gap between the bottom surface of the cassette case 5 and the bottom surface of the cassette case 5 is determined so that the top surface of the ribbon base 1 can be inserted without play.

Further, as shown in FIG. 6, 12 is a printing portion formed by the platen 13 and the printing head 14 facing each other, 15 is a paper transport path, and a feed roller 17 for feeding the paper 16 is provided in the paper transport path 15. It is provided.

Next, the operation will be described. When the front portion of the ribbon cassette 4 is placed on the ribbon base 1 and the protrusion 10 is inserted into the guide groove 2, the locking claw 11 engages with the bending piece 3. As a result, the ribbon base 4 is positioned by fitting the projection 10 and the guide groove 2, and is prevented from being pulled out in the insertion direction by the engagement of the locking claw 11 and the bending piece 3. In this state, print head
Printing is performed on paper 16 by 14.

Problems to be Solved by the Invention The locking claws 11 prevent the ribbon cassette 4 from coming off in the insertion direction, and also come into contact with the back surface of the ribbon base 1 to press the ribbon cassette 4 from the ribbon base 1, It cannot be fixed by floating from the ribbon base 1 at the front part of the cassette 4 on the arm 9 side. Therefore, there is a problem that the ink ribbon 6 comes into contact with the paper 16 and stains the paper 16.

Means for Solving ProblemsProviding a ribbon cassette in which a long ink ribbon is housed in a cassette case with a built-in ribbon feeding mechanism, and a ribbon base on which the cassette case is mounted, the cassette case is provided. A flexible claw that abuts against the back surface of the ribbon base and a projection are integrally formed on both sides of the rear surface of the back surface, and a guide groove that slidably holds the projection on the ribbon base and the engagement member. A locking portion that engages with the pawl is formed, projecting pieces are formed on both sides of the front portion of the cassette case, and a fitting portion into which these projecting pieces are fitted is formed on the ribbon base.

Therefore, the cassette case is positioned with respect to the ribbon base by fitting the guide groove and the protrusion, and the engaging claw and the engaging part prevent the cassette case from slipping off in the insertion direction. By contacting the back surface of the ribbon base with the pawl, the rear portion of the cassette case is prevented from floating with respect to the ribbon base, and the front portion of the cassette case is prevented from floating with respect to the ribbon base by fitting the protrusion and the fitting portion.

Embodiment An embodiment of the present invention will be described with reference to FIGS. The same parts as those described in FIGS. 4 to 6 are designated by the same reference numerals, and the description thereof will be omitted. Projecting pieces 18 are formed on both sides of the front portion of the cassette case 5 on the arm 9 side, and fitting portions 19 to which these protruding pieces 18 are fitted are formed on both front portions of the ribbon base 1.

In such a configuration, when the front portion of the ribbon cassette 4 is placed on the ribbon base 1 and the projection 10 is inserted into the guide groove 2, the bending piece 3 is engaged with the locking claw 11 and the projection piece 18 is fitted. Fit into the joint 19. As a result, the ribbon base 4 is positioned in the left-right direction by fitting the protrusion 10 and the guide groove 2 and fitting the protrusion 18 and the fitting portion 19, and the locking claw 11 and the bending piece 3 are also provided.
By engaging with, the retainer in the insertion direction is prevented. Further, since the locking claws 11 abut on the rear portion of the rear surface of the ribbon base 1, the rear portion of the cassette case 5 does not float from the ribbon base 1, and the protrusion 18 is pressed to the ribbon base 1 side by the fitting portion 19. Therefore, the cassette case 5 is entirely held in close contact with the surface of the ribbon base 1.
Therefore, the ink ribbon 6 pulled out between the arms 9 is always located at a fixed position, and the portion other than the portion to be printed does not touch the paper 16 and stain the paper 16.

Since the present invention is configured as described above, the cassette case is positioned with respect to the ribbon base by fitting the guide groove and the protrusion, and the cassette case is positioned by the engagement of the locking claw and the locking portion. The locking of the cassette case against the ribbon base is prevented by preventing the detachment in the insertion direction and preventing the rear part of the cassette case from floating with respect to the ribbon base by abutting the locking claw on the back surface of the ribbon base. It is possible to prevent the front part of the printer from floating, thus avoiding a situation in which the ink ribbon pulled out to the printing unit is positioned at a fixed position and the ink ribbon inadvertently contacts the paper and stains the paper. Has the effect of being able to.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is an exploded perspective view, FIG. 2 is a bottom view showing a mounting state of a cassette case on a ribbon base, and FIG. FIG. 4 is a side view showing a state in which the cassette case is attached to the ribbon base in cross section, FIG. 4 to FIG. 6 show a conventional example, FIG. 4 is an exploded perspective view, and FIG. FIG. 6 is a bottom view showing a mounted state, and FIG. 6 is a side view showing a mounted state of the cassette case with respect to the ribbon base with a partial cross section. 1 ... Ribbon base, 2 ... Guide groove, 3 ... Bending piece (locking part), 4 ... Ribbon cassette, 5 ... Cassette case, 6 ... Ink ribbon, 7 ... Winding shaft (ribbon feed) (A part of mechanism), 10 ... projection, 11 ... locking claw, 12 ... printing section, 18 ... projection piece, 19 ... fitting section

Claims (1)

[Scope of utility model registration request] 1. A cassette case having a ribbon feed mechanism built-in, comprising a ribbon cassette containing a long ink ribbon and a ribbon base on which the cassette case is mounted, the rear part of the rear surface of the cassette case. A flexible claw that abuts the back surface of the ribbon base and a protrusion are integrally formed on both sides, and a guide groove that slidably holds the protrusion on the ribbon base and the claw are provided. A ribbon characterized in that a locking portion to be engaged is formed, projecting pieces are formed on both sides of a front portion of the cassette case, and a fitting portion into which these projecting pieces are fitted is formed on the ribbon base. Cassette holding device.