JPH047936Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a mold for forming a tape cartridge, and more specifically, to the mold structure of the retaining pin portion for fixing the reel presser spring provided on the inner surface of the main body case. It has characteristics.

[Conventional technology]

Conventionally, a tape cartridge as shown in FIG. 4, for example, has upper and lower plastic cases 1a and 1b.
The main body case 1 is formed by integrally joining together in a butt shape.
Tape reels 3, 3, on which the tape 2 is wound, are rotatably positioned on the drive shaft insertion holes opened in the lower case 1b, and tape guides 5, 3 are installed on the left and right sides of the front of the main body case 1. 5, the tape 2 is led out from one tape reel 3 to the front surface of the main body case via these tape guides 5, 5, and wound onto the other tape reel 3. A front cover 6 is attached to the front side of the main body case 1 so as to be openable and closable, and in the closed state covers and protects the outer front surface of the tape 2.

In such a tape cartridge, as shown in FIG. 5, a reel pressing spring 7 is assembled on the inner surface of the upper case 1a to constantly press and bias the tape reels 3, 3 toward the lower case 1b. This reel pressing spring 7 has a pair of front and rear stop holes 8, 8 in the center in the left and right longitudinal direction, and a stop pin 9, which integrally projects from the inner surface of the upper case 1a, and 9 and position it into the locking hole 8 of the locking pin 9.
The protruding end is fixed to the inner surface of the upper case 1a by welding by caulking using ultrasonic waves or simply by press-fitting the stop pin 9 into the stop hole 8.

The stop pin 9 for fixing the reel presser spring 7 in this way is integrally molded on the inner surface of the case at the same time as the upper case 1a is injection molded from plastic material, and the stop pin 9 is formed in the mold for the molding. The recessed part for this purpose is usually carved directly into the mold. In some cases, the concave part can also be nested. However, as shown in FIG. 10, this nested member has concentric recesses 10 for forming the retaining pin 9, and this insert 13 is used only for retaining the retaining pin 9.
It is simply a countermeasure in case of variations in height or diameter, allowing the parts to be replaced economically.

[Problem that the invention attempts to solve]

The problem arises when changing the size and shape of the reel pressing spring 7 in the same tape cartridge. In this case, the overall shape and size of the upper case 1a of the tape cartridge are the same, but only the pitch and position of the stop pin 9 for fixing the reel presser spring 7 are changed. For example, in order to reduce the cost of the reel presser spring 7, the width of the reel presser spring 7 as shown in FIG. 3a is made narrower as in the spring 7 shown in FIG. This is a case where the pitch is to be reduced.

In such a case, either modify the entire mold to change only the pitch of the stop pitch part, or
Alternatively, if a new one is to be manufactured, the manufacturing period required is not short and the cost is extremely high.

In view of this point, the purpose of this invention is to improve the structure of only the portion of the mold that forms the stop pin described above, thereby making it possible to easily and inexpensively respond to changes in the stop pin and its position. .

[Means for solving problems]

In order to achieve the above object, in the present invention, as illustrated in FIG. 1, in a mold for plastic molding a main body case 1 having a retaining pin 9 for fixing a reel presser spring integrally protruding from the inner surface of the case, On the premise that the part having the recess 10 for forming the retaining pin is to be the insert 11, the insert 11 is rotatably incorporated, and the recess is located at a position offset from the center of rotation. It is set so that there are 10. The rotation of the insert 11 may be performed either while it is still incorporated in the mold, or if it is rotated once removed from the mold.

[Effect]

In such a case, by rotating the insert 11, the position of the recess 10 for forming the stop pin 9 can be changed.

[Effect of idea]

According to the present invention as described above, by rotating the insert 11, the pitch and position of the stop pin 9 can be changed. Moreover, the modification to such a nested structure has the advantage that it can be done significantly more simply and at a lower cost than the effort and cost required to rebuild or modify the entire mold.

[Embodiment 1] Figures 1 to 3 show a first embodiment of the present invention, in which the pitch of the stopper hole 8 of the reel presser spring 7 is set as the mold 12 for the upper case 1a of the tape cartridge. a and the smaller b
The structure is configured to be able to correspond to the current situation. That is, in the molding die 12, a portion having a recessed portion 10 for forming the retaining pins 9, 9 for fixing the reel presser spring is set as the insert 11 for the cavity piece 15. This insert 11 is formed into an elliptical shape, and the mold 1
Tighten the bolt 14 from the back side of 2, loosen the bolt 14 once, and pull it out from the mold 12.
The insert 11 is rotated 180 degrees and assembled into the mold 12 again, and a recess 10 for forming a stop pin 9 is provided at a position offset from the rotation center O of the insert 11 in the major axis direction. These two nests 11,1
1 is shown by the imaginary line in FIG. 1, when both inserts 11 are reversed and reassembled in order to bring the recessed portions 10 closer to each other, the pitch between the recessed portions 10 becomes b, and in the same figure, As shown by the solid line, when the recesses 10 are reversed to separate them from each other, the recesses 1
The pitch between 0 and 10 is set to be a.

In such a case, the pitch of the retaining pins 9 can be made to correspond to both a and b by simply reversing the insert 11.

Instead of forming the insert 11 in an elliptical shape, it may be formed in a circular or square shape as shown in FIGS. 6a and 6b.

[Embodiment 2] FIG. 7 shows the embodiment of the present invention shown in FIG.
In this case, two recesses 10, 10 for forming the stop pin 9 are provided in one circular insert 11, so that the insert 11 can freely rotate around the center O.

According to this, by rotating the insert 11, only the angle of the stop pins 9, 9 can be changed without changing the pitch. Therefore, for example, as shown in FIG.
It is possible to correspond to one having a pair of locking holes 8, 8 of the same pitch at the left and right positions as shown in FIG. 8.

[Embodiment 3] FIG. 9 shows a third embodiment of the present invention, in which two small circular inserts 11a having one recess 10 at each eccentric position and two large circular inserts 11b are used. A large circular insert 11 is installed so that each insert 11a can rotate around the center _O1 .
b is assembled into the mold 12 so as to be rotatable around the center _O1 .

When two types of inserts 11a, 11b are combined in this way, both the pitch and angle of the stop pins 9, 9 can be changed. As a result, the positions of the stop pitches 9, 9 can be set over the entire area indicated by the hatched area S in the figure.

[Brief explanation of the drawing]

1 to 3 show a first embodiment of the present invention, in which FIG. 1 is a plan view of the nested part of the molding die, FIG. 2 is a sectional view taken along the - line in FIG. Figures a and b are plan views showing reel presser springs with different stopper hole pitches. FIG. 4 is an external perspective view of the tape cartridge, and FIG. 5 is an internal plan view of the upper case. FIG. 6 is a plan view showing a modified example of the nested shape of the mold of the present invention. Figures 7 and 8
The figures show a second embodiment of the present invention, with FIG. 7 being a plan view of the nested part of the mold, and FIG. 8 being a plan view of the reel presser spring. FIG. 9 is a plan view of a nested part of a mold showing a third embodiment of the present invention. FIG. 10 is a plan view of a nested portion of a conventional mold. 1... Main body case, 2... Tape, 3... Tape reel, 7... Reel presser, 8... Stopping hole, 9... Stopping pin, 10... Recessed part, 11...
Insert, 12...Mold for molding.

Claims (1)

[Scope of utility model registration request] A mold for molding a main body case 1 from plastic, in which a stop pin 9 for fixing a reel presser spring is integrally protruded from the inner surface of the case. The insert 11 is configured to be rotatable, and
A mold for forming a tape cartridge, characterized in that the recessed portion 10 is set at a position offset from the center of rotation.