JPH03120681A - Tape cartridge - Google Patents

Abstract

PURPOSE:To directly protrude a former cover molded article without being vertically shifted at the time of protruding it from a mold by providing a rectangular recessed part where a protruding pin is inserted into the back-side of the former cover. CONSTITUTION:The former cover 6 is formed in a form in such a way that an upper edge 6a is bent almost perpendicular to the direction of the back and the central part of the horizontal direction of the back of the upper edge 6a is set in a protruding position. Then, the rectangular recessed part 14 formed by inserting the protruding pin P into the position is provided. Thus, the former cover 6 is directly protruded in the direction of an arrow a without being horizontally shifted by the mold releasing resistance when a sliding core C forming a bearing piece 10 being an under cut part is mold-released in the direction of an arrow b since the former cover 6 protrudes while it is held lest it is horizontally shifted.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an improvement of a tape cartridge equipped with a front cover with a back cover for protecting the tape, and in particular takes measures against molding defects in the front cover. .

[Conventional technology]

As a conventional tape cartridge of this type, for example,
There is one for 8 Ringu videos as shown in Fig. 6 and Fig. 6. There, there are tapes 2 on the left and right inside of the main body case, S1.
The reels 3, 3 on which are wound are rotatably housed and arranged. The tape 2 is led out from one reel 3 to the front side of the main body case l, passes through a tape loading pocket 4, and is wound onto the other reel 3. A plastic front cover 6 is rotatably attached to the main body case 1 to cover and protect the front side of the tape 2 led out to the front side of the main body case 1. The tape cartridge can be freely switched between a closed position in which the front side of the tape 2 is covered when not in use and an open position in which the front side is opened when in use.

Further, within the tape loading pocket 4, a back cover 8 is attached to the back side of the front cover 6. This back cover 8 covers the back side of the tape 2, more specifically, the back side including the lower side thereof and the top side of the opening of the pocket 4 when not in use.

In FIG. 6, the back cover 8 is a plastic molded product with a generally T-shaped cross section, and has a rotating shaft 9 near the center of each of its left and right edges in the vertical direction. The bearing piece 10 is rotatably pivoted into each shaft hole 10a of the bearing piece 10. Further, a sliding shaft 11 is provided at the left and right edges of the back cover 8 at a position lower than the rotating shaft 9, and this is attached to the left and right side walls 12 in the pocket 4.
・Approximately S-shaped back cover guide groove 1 provided in each of the 12
3 so that it can slide freely.

The front cover 6 and the back cover 8 open upward from the closed position shown by solid lines in FIG. 6, respectively. That is, when the front cover 6 is rotated upward from the closed position, the back cover 8 follows this and rotates around the rotating shaft 9 while sliding the sliding shaft 11 upward along the back cover guide groove 13. 6.
It opens upwards as shown by the two-dot chain line in the figure.

[Problem to be solved by the invention]

As described above, the front cover 6 has a protruding bearing piece 10 for assembling the back cover 8, and the shaft hole 10a is provided at the tip of the bearing piece 10. The problem arises when molding the front lid 6 of this shape. During this molding, since the shaft hole 10a of the bearing piece 10 becomes an undercut portion, it is removed by a slide core C as shown in FIG. Furthermore, after the front cover 6 is molded, it is projected from the mold in the direction of the arrow a shown in FIG. Due to the mold release resistance of C, the front lid molded product was likely to shift to the left or right, causing molding defects such as impairing the appearance and dimensional accuracy of the molded product. In the worst case, one of the left and right undercaft portions (shaft hole 10a) could protrude without being removed, and the bearing piece 10 could be damaged.

The present invention has been made to solve these problems, and by making the above-mentioned shape modification to the front cover, the front cover molded product can be displaced from side to side when it is ejected from the mold. The purpose is to make the molded product protrude straight without causing any defects such as damage to the bearing piece, and to finally obtain a molded product with good appearance and dimensional accuracy.

[Means to solve the problem]

In the tape cartridge of the present invention, as shown in FIGS. 1 and 2, for example, a protruding bottle P is inserted into the back side of the front lid 6 to prevent displacement in the left and right direction when the front lid 6 is molded. It has a rectangular recess 14 formed by.

[Effect]

In this case, when the front cover 6 is molded, the rectangular protruding pin P bites into the recess 14, so that the front cover 6 is held in place so as not to shift in the left-right direction and is protruded, so that the bearing piece that becomes the undercut part is removed. Even when the slide core C molding the slide core 10 is released from the mold in the direction of the arrow, the front cover 6 is not shifted left or right due to the mold release resistance, and is projected straight in the direction of the arrow a.

〔Effect of the invention〕

According to the tape cartridge of the present invention, by simply providing a rectangular recess 14 into which the protruding bottle P bites into the back side of the front lid 6, the front lid 6 having the bearing piece 10 serving as the underside part can also be attached to the bearing piece. To obtain a front cover molded product that can protrude straight without being displaced due to the movement of a slide core C for molding a slide core 10, has no defects such as damage to a bearing piece 10, and has good appearance and dimensional accuracy. be able to.

〔Example〕

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

Since the overall configuration of the tape cartridge shown in this embodiment is almost the same as that of the conventional tape cartridge described above, similar parts are given the same reference numerals and the explanation thereof will be omitted.
Only the points that are different from the conventional front lid 6 in shape will be explained.

In FIGS. 1 and 2, the front lid 6 is formed with its upper edge 6a bent at a substantially right angle toward the back surface, and the center portion of the back surface of the upper edge 6a in the left and right directions protrudes. It has a rectangular recess 14 formed by setting the protrusion pin P into the position. Ejecting pin P
A rectangular one is used to ensure that it bites into the recess 14.

The recess 14 is located at other locations on the back side of the front lid 6, for example, at the first
They may be provided at the left and right ends of the upper edge 6a of the front lid 6, respectively, as shown by two-dot chain lines in the figure.

In this way, the recess 14 of the front lid 6, which is a molded product, is
If a square ejecting pin P is inserted into the front cover 6 and the front cover 6 is held so as not to shift in the left-right direction and protrudes, the slide core C of the front cover 6 will be released from the shaft hole 10a of the bearing piece 10. Even when doing so, the front cover 6 does not shift to the left or right due to the mold release resistance of the slide core C, and is pushed straight in the direction of the arrow a by the pressure of the end surface P' of the ejection pin P. Therefore, a good molded product was obtained without damaging the bearing piece 10 or impairing its appearance or dimensional accuracy.

[Brief explanation of drawings]

1 and 2 show an embodiment of the tape cartridge according to the present invention, FIG. 1 is a rear view of the front cover, and FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1. . 3 to 6 show a conventional tape cartridge, FIG. 3 is a rear view of the front cover, FIG. 4 is a sectional view taken along the line EV-IV in FIG. 3, and FIG. 5 is an external perspective view. , FIG. 6 is an enlarged sectional view taken along the line Vl--Vl in FIG. 5. 1...Body case, 2...Tape, -Front cover, -Back cover, -Rotating shaft, 10...10a, 14...P...Bearing piece, -Shaft hole, -Concavity,・Extrusion pin. Fig. 1 Old tree by Tanii Kamiki

Claims (1)

[Claims] 1. A front cover (6) that covers the front side of the lead-out part of the tape (2) led out to the front side of the main body case (1), and the back side of the front cover (6). A back cover (8) is attached to the back cover (8) and is attached to the back cover (8) to cover the back side of the lead-out part of the tape (2), and is attached to the back cover (8) so as to be openable and closable. Rotating shaft (9
) is integrally protruded with a bearing piece (10) having a shaft hole (10a) that supports the front cover (6), and a protruding pin (P) is inserted on the back side of the front cover (6) during molding of the front cover (6). A tape cartridge characterized by having a rectangular recess (14) formed by biting.