JPH0880657A - Cassette case - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a cassette case that prevents the case and the cover from being welded while being displaced, has a good appearance, and does not interfere with internal parts. Further, in a cassette case having a core such as an ink ribbon cassette, a cassette case is provided in which the core axis does not deviate and ribbon running is good. [Structure] A cassette case formed by joining the outer peripheral portion of a case and a cover. Protrusions perpendicular to the joint surface are provided on the case and the cover at different positions from each other, and a contact surface with which the inner surface or the outer surface of the protrusion provided on the case and the cover can contact is provided. , Is formed on the other side.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a cassette case. More specifically, when joining the case and cover,
The present invention relates to a cassette case provided with protrusions and recesses so as not to be displaced by pressure or the like. In the present specification, “bonding” is a concept that means the unification of two members by welding with ultrasonic waves or adhesion with an adhesive.

[0002]

2. Description of the Related Art In a conventional cassette case and cover, a pin is provided on one side and a hole is formed on the other side so that the pin can be fitted into the case. It is designed to be fitted into.

In such a cassette case, the diameter of the pin is as large as about 1.5 mm (the strength is insufficient below this) and a considerable space is required to form a hole for inserting the pin. However, there is a drawback that the case cannot be downsized and the cost cannot be reduced. Further, in this local fitting, when a force from the outside of the cassette case is applied (for example, when dropped), a gap is generated in the fitting portion between the case and the cover, and the case is easily deformed.

Therefore, ultrasonic welding, in which ultrasonic waves are applied while applying pressure to the joint surfaces to heat the joint surfaces to a high temperature, does not require a fitting such as the above-mentioned pin and welds even if the joint area is small. It became popular because it was possible.

As shown in FIG. 6 (a), this ultrasonic welding is performed while sandwiching the case 53 and the cover 54 with the anvil 51 and the horn 52 and applying a load of about 40 kgf / m ² to the welding surface 55. Be done.

Generally, the case and cover of the cassette case are made of a thermoplastic resin such as ABS, AS, HIPS, etc., and as shown in FIG. An energy director) 56 is provided. Energy director 5
Reference numeral 6 is for concentrating the ultrasonic energy applied to the welding surface 55, and when vibration by ultrasonic waves is applied while applying pressure, the temperature rapidly rises due to frictional heat due to ultrasonic vibration. Therefore, the energy director 56 melts in a short time of about 1 second, and the welding surface is welded. Figure 6
In (c), the width W of the bottom side of the energy director 56 is usually about 0.3 mm, and the height H is 0.
It is about 2 to 0.3 mm.

By the way, in the cassette case to which the ultrasonic welding method is applied in this way, as shown in FIG. 7, a frame 60 is provided so as to project in order to secure the joint surface of the side portion. FIG. 7A is a perspective view showing an essential part of an example of a cassette case, and FIG. 7B is an enlarged view of part A of FIG. 7A. Protrusions 58 and recesses 59 are provided at appropriate positions on the frame 60. Four sets of the protrusions 58 and the recesses 59 are provided near the corners of the case 53 and the cover 54, and mainly play a role of fixing the positions of the case 53 and the cover 54 during ultrasonic welding.

[0008]

In such a conventional cassette case, the projection 58 is provided on the case 53 and the recess 59 is provided on the cover 54. Therefore, as shown in FIG. 8, when the case 53 tries to shift inward (in the direction of the arrow) with respect to the cover 54, the contact surface 61 inside the protrusion 58 contacts the contact surface 62 of the recess 59. , It does not shift in the direction of the arrow.

However, on the contrary, when the case 53 tries to shift to the outside (in the direction of the arrow) with respect to the cover 54, there is a possibility that the case 53 may shift because there are no surfaces that abut against each other. This deviation tends to occur in the process of applying pressure during ultrasonic welding, and it is about 0.5 mm at the maximum, but in addition to poor appearance, the case or cover hits internal parts and the axis of the core shifts. If a problem occurs, especially in an ink ribbon cassette or the like, if the axis of the core shifts, a problem will occur such that ribbon running is overloaded and running fails.

In view of the above circumstances, it is an object of the present invention to provide a cassette case that prevents the case and the cover from being welded while being displaced, has a good appearance, and does not interfere with internal parts.

Further, in a cassette case having a core such as an ink ribbon cassette, it is possible to provide a cassette case in which the axis of the core is not displaced and ribbon running is good.

[0012]

A cassette case according to the present invention is a cassette case formed by joining the outer peripheral portion of a case and a cover, wherein projections perpendicular to the joining surface are formed on the case and the cover, respectively. And a contact surface with which the inner surface or the outer surface of the protrusion provided on each of the case and the cover can come into contact with,
It is characterized by being formed on the other side.

Alternatively, in the ink ribbon cassette formed by joining the outer peripheral portions of the case and the cover, one of the case and the cover has a cross section perpendicular to the joining surface and horizontal to the joining surface. It is characterized in that a trapezoidal recess is formed so that its upper bottom is open, and that the other has a protrusion having the same shape as the recess and fitted into the recess.

[0014]

In the cassette case of the present invention, since the projection and the contact surface perpendicular to the joining surface are provided on the cover and the case, respectively, there is no fear that the cover is displaced and joined to the case. .

By inserting the projection having the same cross section as the recess into the recess having the trapezoidal cross section, the cover is not displaced and joined to the case.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The cassette case of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is an explanatory view of one embodiment of the cassette case of the present invention, FIG. 2 is a partially cutaway perspective view of FIG. 1, FIG. 3 is a sectional view of a welding surface, and FIG. 4 is another cassette case of the present invention. FIG. 5 is a perspective view of a main part showing another embodiment of the cassette case of the present invention.

In FIG. 1, the cassette case of the present invention comprises a case 1 and a cover 2.
Each has a protrusion 3 and a recess 4.

In FIG. 2, the protrusion 3 provided on the case 1 is perpendicular to the joint surface 5. Further, the protrusion 3 provided on the cover 2 and the protrusion 3 provided on the case 1 are provided at different positions so as not to collide with each other.

The recess 4 faces the projection 3 and is open to the outside. The concave portion 4 is for accommodating the protrusion 3 in the outer peripheral side surface, and also has contact surfaces 6, 7,
8 forming. The contact surface 6 that corresponds to the bottom of the recess 4 provided in the cover 2 contacts the inner side surface 9 of the protrusion 3 provided in the case 1. As a result, the cover 2 does not shift outward with respect to the case 1.

The inner surface of the protrusion 3 provided on the cover 2 contacts the contact surface 6 of the case 1 so that the cover 2 is not displaced inward with respect to the case 1. Therefore, the projection 3 and the contact surface 6 prevent the cover 2 from being displaced inwardly and outwardly.

In the cassette case shown in FIGS. 1 and 2, the projection 3 is provided on the joint surface 5, so that the projection 3 does not project to the outside of the outer peripheral portion but is housed in the recess 4 in the outer peripheral side surface. It has become. Further, in the present invention, it is particularly intended to correct the defect that the cover is displaced inward and outward, and the protrusion 3 among the contact surfaces 6, 7, 8 forming the concave portion 4
The contact surface 6 for contacting the inner side surface 9 of the above is indispensable, but the contact surfaces 7, 8 for preventing lateral displacement are not necessary.

It is also possible to provide the protrusion 3 inside the joint surface 5. In that case, a contact surface is provided so as to contact the outer surface of the protrusion 3.

FIG. 3 shows a preferable position of the energy director formed on the welding surface when the cassette case is ultrasonically welded. The cassette case of the present invention is intended to be fixed so as not to shift during joining. Therefore, in addition to the example shown in FIG. 3, it is possible to exert an effect in the case of adhering with an adhesive agent, but it is particularly effective in a joining means that needs to apply a constant pressure in the vertical direction, such as ultrasonic welding. sell.

In FIG. 3, the energy director 2
6 is the center line 25 of the thickness of the frame 22 which provides the joint surface.
It is provided outside. The energy director 26 is preferably provided so as to be slightly closer to the center line 25 than the center of the lower surface 22a of the frame 22, that is, L1 <L2. The cassette case has a clean appearance because there is no fear that it will flow out and form extra protrusions.

FIG. 4 shows an external appearance of an ink ribbon cassette containing a narrow ink ribbon as an example of a cassette case. In this ink ribbon cassette, a case 31 and a cover 32 rotatably support a core 33 that winds and holds the ink ribbon. In the present invention, the case 31 and the cover 32 have projections 34 and 35, respectively.
And a contact surface is provided. Therefore, it is not displaced and joined, and the axial center of the core 33 is not displaced. Therefore, an extra load is not applied during ribbon running, stable running is achieved, and as a result, good printing is achieved.

FIG. 5 is a cutaway perspective view of a main part showing another embodiment of the cassette case of the present invention. In FIG. 5, a case 41 is formed with a recess 44 having a trapezoidal cross section, and a cover 42 is formed.
A projection 43 having the same shape as the recess 44 is provided in the.

The recess 44 includes a lower bottom surface 46 and hypotenuse surfaces 47, 4
8 is perpendicular to the joint surface 45, and the upper bottom side is opened along the side surface along 49. When the projection 43 is inserted into the recess 44, the oblique sides 47 and 48 can prevent the cover 42 from shifting outward. Further, the lower bottom surface 46 prevents the cover 42 from being displaced inward. Further, the oblique sides 47 and 48 do not cause lateral displacement.

[0029]

As described above, in the ink ribbon cassette of the present invention, the cover will not be displaced even if pressure is applied during joining. Therefore, the appearance is sharp, and in an ink ribbon cassette having a core or the like, the axis of the core matches the cover and the case without error, and the ribbon travels well. In addition, it is possible to manufacture a cassette case that can sufficiently fulfill its function.

[Brief description of drawings]

FIG. 1 is an explanatory view of an embodiment of a cassette case of the present invention.

2 is a partially cutaway perspective view of FIG. 1. FIG.

FIG. 3 is a sectional view of a welding surface.

FIG. 4 is a perspective view showing another embodiment of the cassette case of the present invention.

FIG. 5 is a cutaway perspective view of a main part showing still another embodiment of the cassette case of the present invention.

FIG. 6 is a cross-sectional explanatory view of the welding surface of the cassette case to which the ultrasonic welding method is applied.

FIG. 7 is an explanatory diagram showing a main part of an example of a conventional cassette case.

FIG. 8 is a sectional view of a main part of a conventional cassette case.

[Explanation of symbols]

 1, 31, 41, 53 Cases 2, 32, 42, 54 Covers 3, 34, 35, 43, 58 Protrusions 4, 44, 59 Recesses 5, 45 Bonding surfaces 6, 61, 62 Contact surfaces 9 Inner surface

Claims (2)

[Claims] 1. A cassette case in which a case and a peripheral portion of a cover are joined to each other, wherein projections perpendicular to the joining surface are provided at different positions on the case and the cover, respectively. A cassette case, characterized in that an abutting surface with which the inner side surface or the outer side surface of the protrusion provided on each of the above can abut, is formed on the other side. 2. An ink ribbon cassette formed by joining outer peripheral portions of a case and a cover, wherein one of the case and the cover has a cross section perpendicular to the joining surface and horizontal to the joining surface. A cassette case, characterized in that a trapezoidal recess is formed so that its upper bottom is open, and the other has a protrusion having the same shape as the recess and that can be fitted into the recess.