JPH0510304Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention relates to a tape cartridge in which a liner sheet is installed, and is characterized by means for preventing displacement of the liner sheet during assembly.

[Conventional technology]

Fig. 4 shows a typical example of a conventional tape cartridge, which is made up of upper and lower plastic cases 1a and 1b that are butted together and connected with screws, etc., and has drive shaft insertion holes 2 on the left and right sides of the center of the main case 1. ,2
A pair of hubs 4 around which the tape 3 is wound are positioned above each drive shaft insertion hole 2 and rotatably accommodated, and the upper and lower edges of the tape 3 and the upper and lower cases 1a,
Liner sheets 5a and 5b, which are made of polyethylene terephthalate, polytetrafluoroethylene, or the like and have excellent lubricity properties, are interposed between the inner surfaces of the inner surfaces of the inner surfaces 1b and 1b.

When assembling this, as shown in Fig. 5, the lower liner sheet 5b, the left and right hubs 4, 4 with the tape 3 wound thereon, and the upper liner sheet 5a are assembled in order into the lower case 1b, and then the upper liner sheet 5b is assembled into the lower case 1b. The case 1a is placed over the top and bottom cases 1a and 1b, and several parts of the upper and lower cases 1a and 1b are connected using tapping screws or the like. Generally, the lower case 1b is placed on a jig on an automatic assembly line and is assembled while being moved intermittently.

The problem is misalignment of the upper liner sheet 5a during assembly. That is, until the lower case 1b is covered with the upper case 1a, the upper liner sheet 5a is simply placed on the hub 4 and the layer of tape 3 wound thereon. Easy to shift. If the upper case 1a is covered with the liner sheet 5a shifted, the boss 9 protruding from the inner periphery of the drive shaft insertion hole 2 of the upper case 1a will not fit correctly into the hole 10 of the liner sheet 5a, causing the sheet 5a to between the boss 9 and the upper end surface of the hub 4, and between the peripheral walls 11, 1 of the upper and lower cases 1a, 1b.
If the product gets caught between the two abutting surfaces, it becomes a defective product.

Therefore, as a conventional measure to prevent liner sheet displacement, a configuration as shown in FIG. 6 has been well known. These seat position regulating pins 7, 7 are located at the front and rear of the left and right center portions of the inner bottom surface of the lower case 1b.
is formed high, and when the upper liner sheet 5a is placed on the hub 4, the front and rear edges of the sheet 5a are respectively locked to sheet position regulating pins 7, 7 to regulate the position of the sheet 5a. It is. Third
In the figure, the upper liner sheet 5a has position regulating parts 8, 8 made of holes, notches, etc., and the sheet position regulating pins 7, 7 are connected to these position regulating parts 8, 8.
I get stuck in it.

[Problem that the invention attempts to solve]

However, before the upper case 1a is covered, the seat position regulating pins 7, 7 often do not completely fit into the position regulating parts 8, 8 provided at the front and rear of the upper liner sheet 5a. Even in the stuck state, the position regulating parts 8, 8 can easily come off from the pins 7, 7. In particular, when the lower case 1b is moved on an automatic assembly line, the liner sheet 5a is likely to shift due to the impact of the movement.

Moreover, the liner sheet 5a is not limited to a flat one. In order to demonstrate the tape holding function, the sixth
There is a tendency to use a liner sheet 5a that is curled as shown by the imaginary line F in the figure. This degree of curl is large in the free state, and it is actually impossible to regulate the position of the upper liner sheet 5a using only the conventional sheet position regulating pins 7, 7. To further mention this point, when the liner sheet 5a is placed on the hub 4, the central part of the sheet 5a in the front and back direction is shaped like a valley and contacts the upper edge of the tape 3 between the left and right sides. Although,
Its front and rear edges have a raised shape.
Therefore, the height of the seat position regulating pins 7, 7 protruding from the inner bottom surface of the lower case 1b is limited.
It is difficult to fit the sheet 5a into the position regulating portions 8, 8, which are made of holes, notches, etc.

[Purpose of invention]

This invention focuses on this fact, and it is possible to cover the upper case 1a not only when the upper liner sheet 5a is flat, but also when it is curled and slightly misaligned on the hubs 4, 4. The purpose is to improve the workability of automatic assembly by allowing correction to the correct position.

[Means for solving problems]

In order to achieve the above object, the present invention takes the form of assembling a tape cartridge in which an upper case 1a is placed over a lower case 1b in which a hub 4 around which a tape 3 is wound and an upper liner sheet 5a are pre-assembled. assume something.

In addition, in the present invention, corner cut-off portions 13 are provided at each of the four corners of the upper liner sheet 5a, and sheet positioning ribs 14 that contact or are close to the edges of the corner cut-off portions 13 from the inner surface of the upper case 1a are provided.
is provided to protrude higher than the height of the peripheral wall 11 of the upper case 1a, and when the upper case 1a is placed over the lower case 1b, the sheet The upper liner sheet 5a is corrected to the correct position by positioning ribs 14.

[Effect]

Now, on the assembly line, as shown in FIG. 3, the lower liner sheet 5b,
The hub 4 wrapped with the tape 3 and then the upper liner sheet 5a are installed in this order. At this time, it is assumed that the liner sheet 5a is slightly displaced on the hubs 4, 4. Under this condition, upper case 1a
When the liner sheet 5a is covered, the sheet positioning rib 14 on the upper case 1a side corrects the misalignment of the liner sheet 5a from its four sides toward the center. At this time, for example, the tip of the sheet positioning rib 14 on the side in the direction of deviation of the liner sheet 5a is
Although the sheet 5a is pressed against the edge near the corner cut portion 13 on the surface, the sheet 5a slides on the tip of the rib 14 due to the elastic repulsion force and is corrected in the opposite direction to the misalignment direction. Liner sheet 5a corrected in this way
At the same time, when the peripheral wall 11 of the upper case 1a abuts against the peripheral wall 12 of the lower case 1b, the liner sheet 5a
The holes 10, 10 of the upper case 1a are fitted into the bosses 9, 9 of the upper case 1a.

[Effect of idea]

As explained above, according to this invention, the sheet positioning ribs 14 that are in contact with or close to the edges of the cut-off portions 13 at the four corners of the upper liner sheet 5a are moved from the inner surface of the upper case 1a to the height of the peripheral wall 11 of the case 1a. When the upper case 1a is covered with the hub 4 in the lower case 1b, it is possible to
The upper liner sheet 5a was corrected from its four sides toward the center and placed in the correct position. Therefore, when the liner sheet 5a is placed on the hub 4 in the lower case 1b, and then the upper case 1a is placed over the lower case 1b, the assembly can be performed without any problems such as the liner sheet 5a getting caught. It came to this.

〔Example〕

An embodiment of the tape cartridge according to this invention will be described below.

Since the overall structure of the tape cartridge is substantially the same as that of the conventional tape cartridge described above, the same reference numerals are given and the explanation thereof will be omitted, and only the points different from the conventional sheet positioning means will be explained.

In FIGS. 1 to 3, corner cut portions 13 are formed by cutting off the four corners of the upper liner sheet 5a in an arc shape or diagonally, respectively. on the other hand,
Seat positioning ribs 14, 14 are provided to protrude higher than the height of the peripheral wall 11 from the inner surfaces of the left and right peripheral walls 11, 11 of the upper case 1a at two locations, front and rear. that rib 1
4 and the corner cut-off portions 13, when the upper liner sheet 5a is in the normal position where the left and right holes 10, 10 are fitted into the left and right bosses 9, 9 of the upper case 1a, the four seat positioning ribs 14 are set so that they are in contact with or close to the edges of the cut-off portions 13 at the four corners of the liner sheet 5a.

The height of the seat positioning rib 14 is the lower case 1b.
By setting the liner sheet as high as possible so as to be close to the inner surface of the rib 14, the elastic repulsion force generated when the liner sheet 5a is pressed by the rib 14 can be increased, and the effect of correcting the liner sheet 5a to the normal position can be further enhanced. This is preferable in this respect.

Seat position regulating pins 7, 7 are provided protruding from two places in the front and back of the center in the left and right direction on the inner surface of the upper case 1a, and the height of the pins 7 is also equal to the seat positioning rib 1.
Similarly to 4, set higher than the height of the peripheral wall 11,
When the upper case 1a is placed on the upper case 1a, these pins 7, 7 move into position regulating portions 8, 8, which are formed by holes or notches provided at the front and back of the upper liner sheet 5a on the lower case 1b side.
Try to fit into it. According to this, it is advantageous that the upper liner sheet 5a can be positioned more accurately.

Note that the lower liner sheet 5b is positioned using the holes 1 provided in the sheet 5b in the same manner as in the conventional example shown in FIG.
This is done by fitting the screws 0 and 10 into the bosses 9 and 9 of the lower case 1b.

[Brief explanation of the drawing]

Figures 1 to 3 show an embodiment of the tape cartridge according to the present invention, with Figure 1 being an internal plan view of the upper case, and Figure 2 showing the hub around which the tape is wound and the upper liner sheet. FIG. 3 is an internal plan view of the assembled lower case, and is a longitudinal sectional front view of the main part showing a state in the middle of being covered with the upper case. Figures 4 and 5 show a conventional tape cartridge. Figure 4 is a plan view showing the inside of the lower case with the upper case removed, and Figure 5 shows the state before the upper case is covered. FIG. FIG. 6 is a longitudinal sectional side view of a lower case showing still another conventional example. 1...Main case, 1a...Upper case, 1b...
...lower case, 3...tape, 4...hub, 5a...
... Liner sheet, 11 ... Peripheral wall of upper case, 1
3...Corner drop portion, 14...Positioning rib.

Claims (1)

[Scope of utility model registration request] The hubs 4, 4 around which the tape 3 is wound, the liner sheet 5a placed thereon, and the lower case 1b
and an upper case 1a that is placed over the lower case 1b. Corner cut portions 13 are provided at each of the four corners of the liner sheet 5a, and the upper case 1
The sheet positioning rib 14 that contacts or is close to the edge of the corner cut portion 13 from the inner surface of the upper case 1a
A tape cartridge characterized in that the tape cartridge is protruded higher than the height of a peripheral wall 11 of the tape cartridge.