JPH03189978A - Tape cartridge - Google Patents

Abstract

PURPOSE:To improve moldability and rigidity by forming a central part corresponding to the label adhesion surface of the inside surface of an upper wall in such a projecting state that it is higher than the circumferential surface of the central part and is evenly swollen extending over the whole range of the label adhesion surface. CONSTITUTION:On the assumption that the label adhesion surface 2 is provided in a recessed state to the central part of the outside surface of the upper wall 1a of a main body case 1 made of plastic so that it is lower than the circumferential surface 4 thereof, the central part 3 corresponding to the surface 2 of the inside surface of the wall 1a is formed in the projecting state that it is higher than the circumferential part 5 of the part 3 and is evenly swollen extending over the whole range of the surface 2. By forming the central part 3 of the inside surface of the wall 1a in the projecting state and making it thick in such a way, the thickness of the surface 2 can be secured and the rigidity is improved. Thus, the rigidity and the moldability are improved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tape cartridge, and relates to an improvement in the cross-sectional structure of a label pasting portion of a main body case of the tape cartridge.

[Conventional technology]

As a conventional tape car 1-ridge, there is, for example, a VIS type tape car as shown in FIGS. 3 and 4.

In the case 1 made of plastic, a label attachment surface 2 is formed in the center of the outer surface of the upper wall 1a in a concave shape so as to be lower than the surrounding surface 4 by the thickness of the label. On the other hand, the central portion of the inner surface of the upper wall 1a corresponding to the label pasting surface 2 and the peripheral surface thereof are formed on the same plane without distinction. Therefore, the label pasting portion of the upper wall 1a is thinner than the surrounding area.

[Problem to be solved by the invention]

However, the cross-sectional structure of the upper wall 1a as described above has problems in terms of its shaping and strength, and there is room for improvement. In other words, as shown in the cross-sectional structure of the molding die in FIG. Because of the sudden expansion, the flow velocity and pressure suddenly decreased, gas components within the resin appeared, and as shown in FIG. 3, color unevenness, cloudiness, etc. occurred in part A. This phenomenon occurred noticeably when the gate 7 was positioned on the label application surface 2, impairing the appearance.

Further, as shown in FIG. 4, if a spring 6 for pressing the reel 9 is fixed to the center part of the inner surface of the upper wall 1a corresponding to the label pasting part 2, the reaction force W of the pressing force P to the reel 9
This causes a state in which a deforming force is applied to the thin wall portion, which is thinner and has lower rigidity than other portions, resulting in deformation as shown by the broken line in FIG. 4, especially in a high temperature environment. This was a factor that impaired the heat resistance performance of the tape cartridge.

The present invention has been made to solve these problems, and an object of the present invention is to improve the moldability and rigidity of the label attachment portion of the upper wall without making any ingenuity in the cross-sectional shape.

[Means to solve the problem]

In the tape cartridge of the present invention, for example, as shown in FIG. 1, a recess is formed in the center of the outer surface of the upper wall 1a of the main body case 1 made of plastic so that the label sticking surface 2 is lower than the surrounding surface 4. The central part 3 corresponding to the label pasting part 2 on the inner surface of the upper wall 1a is higher than the peripheral surface 5 of the central part 3 over the entire range of the label pasting surface 2. , it is formed into a flat convex shape.

Connecting portion 3 between the convex central portion 3 and its peripheral surface 5
a, and the connecting portion 2a between the concave label sticking portion 2 and its surrounding surface 4 may be formed on a vertical surface, but are preferably formed on an inclined surface.

[Effect]

By forming the central portion 3 of the inner surface of the upper wall 1a into a convex shape and adding thickness, the thickness of the label sticking surface 2 can be ensured and the rigidity can be increased. For example, increasing wall thickness by 20% will reduce deflection by 70%. Therefore, even when the reel pressing spring 6 is fixed to the central portion 3 of the inner surface of the upper wall 1a, deformation in a high temperature environment due to the reel spring reaction force can be suppressed.

In addition, by forming the central portion 3 of the inner surface of the upper wall 1a in a convex shape to make the wall thickness uniform from the label sticking surface 2 to the surrounding area, and by forming the connecting portions 3a and 2a into inclined surfaces, the shape Sometimes the resin flows evenly and smoothly. The same thing can be said when molding is performed by positioning the gate 7 in the label pasting part 2.

〔Effect of the invention〕

According to the tape cartridge of the present invention, the central part 3 corresponding to the label pasting part 2 on the inner surface of the upper case la is formed in a convex shape to ensure the thickness of the fixed label pasting surface 2 and increase the rigidity. It can effectively prevent deformation in high-temperature environments due to spring reaction force, and has substantially excellent heat resistance.

In addition, by forming the central part 3 of the inner surface of the upper wall 1a in a convex shape and forming the connecting parts 3a and 2a in inclined surfaces, the thickness of the upper wall 1a is made uniform and the fluidity of the resin is improved. Therefore, it is possible to obtain an excellent appearance with very little color unevenness or clouding around the label sticking surface 2.

〔Example〕

An embodiment of the tape cartridge according to the present invention will be described with reference to FIGS. 1 and 2.

A label sticking surface 2 is formed in the center of the outer surface of the upper wall 1a of a main body case 1 made of plastic in a concave shape so as to be lower than the peripheral surface 4 by the thickness of the label. In addition, the central portion 3 corresponding to the labeling surface 2 on the inner surface of the upper wall 1a is
Over the entire range of the labeling surface 2, it is formed into a flat convex shape that is higher than the peripheral surface 5 by approximately the amount of the recess of the labeling surface 2, so that the wall thickness t of the labeling surface 2 is equal to the peripheral surface 4.・The thickness was set to be equal to or close to the wall thickness T between 5 and 5.

The connecting portion 2a between the label pasting surface 2 and its peripheral surface 4 is formed as an inclined surface, and the connecting portion 3a between the convex central portion 3 and its peripheral surface 5 is also parallel to the connecting portion 2a. , was formed on a slope similar to this.

When the wall 1a having such a cross-sectional shape was injection molded with the gate 7 positioned on the label pasting surface 2, color unevenness and cloudiness around the label pasting surface 2 were greatly improved.

In addition, a reel pressing spring 6 was fixed on the surface of the central portion 3 to press the reel 9, and this was placed in a high temperature environment.
The deformation caused by the reel spring reaction force was extremely small.

[Brief explanation of drawings]

1 and 2 show an embodiment of the tape cartridge according to the present invention, FIG. 1 is a sectional view of the main part of the upper wall, and FIG. 2 is a view of the main part on the inner surface side of the upper wall. FIG. Figures 3 to 5 show conventional tape cartridges, with Figure 3 being an overall plan view, Figure 4 being a sectional view of essential parts, and Figure 5 being a sectional view of a molding die. ...Body case, 1a...Top wall, 2...Label pasting (-1 side, 2a, 3a...Connection part, 3...Central part, 4, 5...・Surrounding surface, 6... Reel press, 7 ・ ・ ・ ・ ・ Gate. Invention: Yoshiyuki Aritaka, Hiroshi Yamanaka

Claims (1)

[Claims] 1. Upper wall (1a) of plastic main body case (1)
The label attachment surface (2) is attached to the center of the outer surface of the outer surface (4).
), the center portion (3) of the inner surface of the top wall (1a) corresponding to the labeling surface (2) is lower than the labeling surface (2). A tape cartridge characterized in that the central portion (3) is formed in a flat convex shape that is higher than the peripheral surface (5) over the entire range. 2. A connecting part (3a) between the convex central part (3) and its peripheral surface (5), and a connecting part (2a) between the concave labeling surface (2) and its peripheral surface (4). 2. The tape cartridge according to claim 1, wherein each of the curved lines (1) is formed on an inclined surface. 3. The tape cartridge according to claim 1, wherein a reel pressing spring (6) is fixed to the convex central portion (3) of the inner surface of the upper wall (1a). 4. The tape cartridge according to claim 1 or 2, wherein a gate (7) is positioned on the label application surface (2).