JPH0351828Y2 - - Google Patents

Description

[Detailed description of the invention] [Technical field] This invention is a tape cartridge that is characterized by the screw fastening points of the upper and lower plastic cases that constitute the main body case, especially the screw fastening points at the front left and right corners. It is.

[Background technology]

FIGS. 6 and 7 show typical conventional examples, in which upper and lower cases 1a and 1 forming the main body case 1 are shown.
This figure shows the screw fastening locations at the front left and right corners of the lower case 1b, in which a boss 14a with a rectangular screw pilot hole 13 is protruded from both front corners of the lower case 1b, and a boss 14a with a diameter larger than the outer diameter of the boss is shown. A base 16 is formed to bulge out approximately half the circumference inside the case. The problem is this large diameter boss base 16.

In other words, a guide roller 6 for guiding the tape 3 to the front of the case is provided inside the inner corner of the case, but this guide roller 6 is supposed to face the large-diameter boss base 16. The distance _C1 between the two is extremely small. In reality, this distance C ₁ is approximately 0.8 mm. Therefore,
When assembling the tape, the tape 3 gets caught on the upper end 16a of the boss base 16, as shown in FIG. 7, and when the upper case 1a is connected with the lid, the tape 3 gets caught between the lower case 1b and the problem. I'm there. Such defects occur when the tape is assembled using an automatic machine, such as when the guide pin 5 or the guide roller 6
This is further facilitated because it is customary to insert a sleeve around the outer periphery of the tube. Upper case 1 for lower case 1b
This is especially true when a is guided in a misaligned position.

In addition, if the boss base 16 has a large diameter and a thick wall, uneven heat shrinkage deformation during molding of the lower case, so-called sink marks, will occur on the lower surface of the case as shown by the symbol A in the figure, and this will affect the parallel flatness of the case. Not only does this reduce the tape runnability, but it also impairs the appearance and reduces the product value. Furthermore,
The presence of thick parts requires a lot of time to cool down the mold, which also causes a decrease in productivity.

In order to solve this problem, the configurations shown in FIGS. 8 and 9 have been proposed.

By making the boss base 16 the same diameter as the boss 14a, this prevents the tape from riding on the boss base 16, which was seen in the conventional example, and increases the distance _C2 between the boss base 16 and the guide roller 6. Take tape 3
In addition, by reducing the thickness of the boss base 16 in some areas, the aforementioned sink mark can be effectively prevented. However, as shown in FIG. 9, the tape 3 tends to be biased toward the boss base 16 at the large interval _C2 .
There is still a problem in that the tape 3 gets caught when fitting the lid of the upper case 1a.

Furthermore, it is known from Japanese Utility Model Publication No. 57-44544 that the inner circumferential side surface of the boss base 16 is formed into a downwardly expanding inclined surface. According to this, the tape 3 is attached to the boss base 1
It can be installed by dropping it along the inclined surface without touching the top surface of the device 6. However, even in this case, the attached tape 3 tends to be biased toward the boss base 16 side, so the upper end of the tape 3 is inclined toward the boss 14a side along the inclined surface, and the upper case 1 is attached to the lower case 1b.
It is unavoidable that the tape 3 gets caught between the upper and lower cases 1a and 1b when the tape 3 is put on.

[Purpose of invention]

Therefore, an object of the present invention is to provide a tape carton that can be easily assembled without the lower edge of the tape 3 getting caught on the upper end of the boss base 16 when the tape 3 is guided and attached to the lower case 1b from above. It's to get the trick.

Another object of the present invention is to provide a tape cartridge in which the tape 3 is not sandwiched between the upper and lower cases 1a and 1b even when the upper case 1a is placed on the lower case 1b.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a tape cartridge having the above-mentioned basic configuration, in which the inner circumferential side surface 16b of the boss base 16 is formed into a vertical surface as shown in the figure, and the boss base 16 is formed with the boss 14a. The upper case 1a is formed to have a slightly larger diameter than the outer diameter of the upper case 1a, and the distance C between the boss base 16 and the guide roller 6 provided in the main body case 1 to face the boss base 16 is set large. The peripheral wall portion 18 of the engagement hole 17 on the case inner side has an inner peripheral side surface 18b formed into a tapered surface that tapers toward the hole edge side.
The tapered end 18a of 8 is the upper end 1 of the boss base 16.
6a is required to face butt-like.

〔Example〕

FIG. 1 illustrates a standard Phillips tape cartridge. The main body case 1 is made by screwing together upper and lower plastic cases 1a and 1b in a lid-like manner, and has driving shaft insertion holes 2, 2 that pass through the upper and lower sides on the left and right sides of the center part. A pair of hubs 4, 4, around which the tape 3 is wound, are positioned above the drive shaft insertion holes 2, 2 and are rotatably mounted, and tape guide pins 5, 5 are installed at the front left and right of the main body case 1. The tape guide rollers 6, 6 are integrally protruded from the case 1b, and are rotatably mounted via support shafts 7, 7 made of separate metal pins. In addition, this support shaft 7,
may be erected integrally from the lower case 1b.
In this way, the tape 3 is guided by the guide pins 5 and guide rollers 6 and is fed out from one of the supply hubs 4 through the erasing head insertion slot 8, recording/playback magnetic head insertion slot 9, and pinch roller insertion slot 10 on the front of the case. The winding hub 4 passes through the winding hub 4 in turn and is wound onto the other winding hub 4.

When assembling a tape cartridge having such a structure, the guide roller 6 is inserted into the lower case 1b from above, the hubs 4, 4 around which the tape 3 is wound are attached, and the tape 3 is moved along a predetermined tape path. Through,
After installing other required parts, upper case 1a
Attach the tapping screws 11 to the upper and lower cases 1a and 1b at a total of 5 locations at the four corners and the front center.
This results in a screw connection.

For this screw connection, a screw insertion hole 12 is provided in each screw fastening location of the upper case 1a, and a boss having a screw pilot hole 13 opposite to the screw insertion hole 12 is provided in the lower case 1b. 14a, 14a, 1
4b, 14b, and 14c are erected.

Among these bosses, the present invention deals with the bosses 14a, 14a located at the front left and right corners of the lower case 1b, which are close to and opposite to the guide rollers 6, 6.

In Figures 2 to 5, the boss 14 in question
a, 14a is a base 16 that extends from the corner of the peripheral wall 15 of the lower case 1b toward the inside of the case.
A cylindrical protrusion is formed on the upper surface, and the upper surface of the base is flush with the upper surface of the peripheral wall 15, that is, the case dividing surface f, so that when the upper case 1a is fitted with the lower case 1b, the boss 14a is It fits into a positioning engagement hole 17 on the upper case 1a side which is connected to the screw insertion hole 12.

In the tape cartridge of this basic form, in the present invention, the inner circumferential side surface 16 of the boss base 16 is
b is formed in a vertical plane, and the boss base 16 is connected to the boss 1.
4a, and the distance C between the boss base 16 and the guide roller 6 installed inside the main body case 1 so as to face the boss base 16 is at the narrowest part.
Set it large so that it is 1.2 to 1.8 mm. and,
The inner circumferential wall 18 of the engagement hole 17 in the upper case 1a is formed into a curved tapered surface that tapers toward the hole edge. 18a is arranged to butt against the upper end 16a of the boss base 16 when the upper case 1a is placed over the lower case 1b.

Note that in order to eliminate the tape getting caught on the upper end 16a of the boss base 16, it is desirable to make the upper end 16a as small as possible, but if it is completely eliminated, the tapered end 18a of the peripheral wall 18 facing it will become a sharp edge. In this case, the upper end 16a is formed with a small portion remaining to the extent that there is no problem in practical use.

Although the illustrated example is as described above, it goes without saying that the present invention broadly includes ultra-small tape cartridges, such as so-called microcassettes and video tape cartridges.

[Effect of the invention] According to the invention as described above, the boss base 1
6 and the opposing guide roller 6 is set to be large, so when the tape 3 is inserted from above between the two 16 and 6 during assembly,
The lower edge of the tape 3 is the upper end 16 of the boss base 16
It is unlikely that the tape 3 will remain stuck to the boss base 16a, and even if it does get caught temporarily, the tape 3 will surely fall inward from the upper end 16a of the boss base with a slight movement. Moreover, the tape 3 inserted between the boss base 16 and the guide roller 6
Even if the inner peripheral side surface 16b is in contact with the inner peripheral side surface 16b, since the inner peripheral side surface 16b is formed as a vertical surface,
The tape 3 stands vertically, and when the upper case 1a is placed over the lower case 1b under this condition, the peripheral wall portion 18 of the engagement hole 17 of the upper case 1 is aligned with the tapered inner peripheral side surface 18b. Since the boss 14a is introduced into the engagement hole 17 with the tapered end 18a positioned outside the tape 3, the inner peripheral side surface 18b is always in contact with the upper edge of the tape 3 and the tape 3 is It will be pushed to the inside of the case (towards the guide roller 6) without any difficulty. Therefore, it is possible to completely eliminate the tape 3 from being caught between the upper and lower cases 1a and 1b even when the sleeve is fitted onto the guide roller 6 and the tape is assembled by an automatic machine, as well as when it is done manually.

Further, since the boss base 16 has a small wall thickness, the occurrence of sink marks therein can be well prevented, and the case can be molded with high precision.

[Brief explanation of the drawing]

Figures 1 to 5 illustrate the tape cartridge according to the present invention, where Figure 1 is a partially cutaway plan view, Figure 2 is a plan view of the main part of the lower case, and Figure 3 is the upper case. 4 is a longitudinal sectional view of the main part, and FIG. 5 is an exploded perspective view of the main part. 6 and 7 show a conventional example, with FIG. 6 being a plan view of the main part and FIG. 7 being a longitudinal sectional view thereof. 8 and 9 show a further improved conventional example, in which FIG. 8 is a plan view of the main part, and FIG. 9 is a longitudinal sectional view thereof. 1...Main case, 1a...Upper case, 1b...
...lower case, 3...tape, 4...hub, 6...
Guide roller, 11...Tapping screw, 12...
...Screw insertion hole, 13...Screw pilot hole, 14a...Boss, 15...Surrounding wall, 16...Boss base, 16a...
...Top end of boss base, 17...Engagement hole, 18...Peripheral wall of engagement hole, 18a...Tapered end of peripheral wall, C
...The distance between the boss base and the guide roller.

Claims (1)

[Scope of claim for utility model registration] Main case 1 is upper and lower cases 1 made of plastic.
a and 1b are connected with tapping screws in a lid-like manner, and at the screw fastening points at the front left and right corners of the main case 1, from the corners of the peripheral wall 15 to both front corners of the peripheral wall 15 of the lower case 1b. A boss base 16 is extended inward toward the inside of the case, and a boss 14a with a screw hole 13 that protrudes from the top surface of the peripheral wall 15 is provided on the top surface of the base 16, and is provided at the front of the upper case 1a. In a tape cartridge having a positioning fitting hole 17 into which the boss 14a fits and a screw insertion hole 12 connected thereto are formed at both corners, the inner circumferential side surface 16b of the boss base 16 is formed to be a vertical surface. , the boss base 16 is formed to have a slightly larger diameter than the outer diameter of the boss 14a, and the distance C between the boss base 16 and the guide roller 6 installed in the main body case 1 to face the boss base 16 is increased. The inner peripheral wall 18 of the engagement hole 17 in the upper case 1a has an inner peripheral side surface 18b formed into a tapered surface that tapers toward the hole edge. 18. A tape cartridge characterized in that a tapered end 18a of the boss base 16 faces an upper end 16a of the boss base 16 in abutting manner.