JPS60229286A - Tape cartridge - Google Patents

Abstract

PURPOSE:To prevent gaps of both sides from ventilating with each other to prevent the entry of dust by constituting in such a way that the bottom of a dust cover abuts on the front plate bottom of a case front cover in a meandering state to the outside rather than to the inner face of the front plate. CONSTITUTION:When a front cover 9 of a case main body 1 is closed, a dust cover 12 rotates along a pivot 13 according to its self-weight, and its bottom edge 12 abuts on that of a front plate 10 of the front cover 9 and closes. A recessed part 19 is formed by cutting off a corner of a bottom face 10b of the front plate 10 so that the top of a bottom edge 12b of the cover 12 can match to the recessed part 19, both of which abut completely each other. Since a gap between the recessed part 19 and a part 20 bypasses, dust hardly enters into a space S from the bottom even if the defective contact touching occurs between abuted faces.

Description

[Detailed Description of the Invention] The present invention provides a tape cartridge in which a tape protection front cover with a dust cover attached to the front of the main body case is pivotally mounted so that the front cover of the case can be switched between a closing position and an upward open position. The purpose of this invention is to improve the dust seal provided by the dust cover.

In the video tape cartridge shown in the figure, a front cover 9 that closes the front side of the main body case 1 is pivotally attached to the main body case 1.
When not in use, the front cover 9 covers and protects the outside of the front surface of the tape 2 led out to the front of the case.3 At the left and right center of the front edge of the case 1, there is a tape loading member for the magnetic recording device. If the pocket 7 that allows the insertion of the pocket 7 is formed with a series of wide and large recesses on the left and right sides, the tape 2 is likely to be coated by dust that enters from the lower and upper surfaces of the opening of the pocket 7, and the tape 2 will not touch the tape 2. There are many opportunities to touch it.

Therefore, a dust cover 12 is arranged inside the front lid 9 at the location where the pocket 7 exists, and the dust cover 12 closes the inner side including the lower side of the tape 2 and the upper surface of the opening of the pocket 7 when not in use. It has been proposed to prevent dust from adhering to 2.

However, as shown in FIG. 10, in the currently proposed method, it is difficult to bring the lower end of the dust cover 12 into close contact with the vertical inner surface 10a of the front plate 10 of the front cover 9 due to dimensional accuracy. can be.

A gap g is created between the two, and dust flows from this gap g to the front cover 9.
This tends to invade the tape insertion space S between the tape and the dust cover 12, and there is room for improvement.

Focusing on this fact, the present invention does not require very strict dimensional accuracy and only slightly changes the shape of the lower end of the front plate 10 of the front cover 9 or the lower end of the dust cover 12. A gap g that easily allows dust to enter is prevented from forming directly between the front plate 10 of the front cover 9 and the lower end of the dust cover 12.

Hereinafter, the details will be explained based on the drawings. One drawing shows an example of a video tape cartridge, and in FIGS. 1 to 3, 1 is a main body case. A pair of tape reels 3 on which the tape 2 is wound are rotatably mounted on the left and right sides of the main body case l on each drive shaft insertion hole 5 provided in the bottom wall 4 of the case. It has tape guide members 6, 6 on the front left and right sides, and these guide members 6
6, the tape 2 is led out from one tape reel 3 to the front of the case and wound onto the other tape reel 3.

Reference numeral 7 denotes a pocket into which a tape loading member of the magnetic recording device can be inserted, and is formed in a large recessed manner in the left and right center portions of the front line of the main body case l.

Reference numeral 9 denotes a front cover for protecting the tape, which consists of a front plate 10 and connecting pieces 11 and 11 connected rearward from the left and right ends of the front plate 10.
11, and a front plate 10 is pivotally connected to the left and right side walls of the main body case 1 via left and right connecting pieces 11, 11, so as to be freely rotatable between a case front closing position and an upward open position B. This front lid 9 is biased to rotate by a spring member 8 to a closed position.

and is locked in the closed position. When the tape cartridge is loaded into the magnetic recording device, the front cover 9 opens upward and the tape 2 can be pulled out to the front of the case by a tape loading member on the magnetic recording device side that is inserted into the pocket 7 from below.

4 and 5, reference numeral 12 denotes a dust cover 12 disposed inside the front lid 9 at the location where the pocket 7 is present.
It is. This dust cover 12 has pivots 13 protruding from the left and right ends of the upper and lower intermediate parts.

In addition, cam followers 15, 15 are respectively provided on projecting pieces 14, 14 extending from the inner side of the left and right ends, and the front lid 9
Left and right brackets 1 hanging from the upper end of the front plate 10 of
The pivot shafts 13, 13 are rotatably connected to the pockets 6, 16, and the cam followers 15, 15 are fitted into substantially S-shaped cam grooves 17, 17 formed on the left and right sides of the pocket 7, respectively. When the front plate 10 of the front cover 9 is in a closed vertical position, the dust cover 12 rotates around the pivot 13 due to its own weight balance so that the lower end of the dust cover 12 is aligned with the lower end of the inner surface 10a of the front cover 10. Accordingly, the inner side including the lower side of the tape 2 running inside the front plate 10 is closed, and the upper surface plate portion 12a of the dust cover 12 also closes the upper surface of the opening of the pocket 7. When the front cover 9 opens, the cam follower 15 is guided by the cam groove 17, and the dust cover 12 moves upward together with the front cover 9 without interfering with the tape 2 at all, as shown by the imaginary line in FIG. 7
Leave the front side open.

The present invention provides a front lid 9 equipped with such a dust cover 12, in which the inner surface 10 of the front plate 10 of the front lid 9 when not in use.
The problem is the contact between a and the lower end of the dust cover 12.

That is, in the closed state of the front lid 9 shown in 6th FyJ,
A recess 19 is formed on the front lid 9 side by dropping the corner between the inner surface 10a and the lower end surface 10b of the front plate 10.

This recess 19 is a vertical contact surface 1 reaching the lower end surface Job.
9a, and a downwardly inclined connecting surface 19b connecting the corresponding surface 19a and the inner surface 10a. on the other hand,
The lower end 12b of the dust cover 12 is bent horizontally toward the front plate 10, and the recess 19 extends in the left and right direction from the front end face 20 of the horizontal lower end 12b facing the front plate 10.
Form into a shape that matches. And dust cover 12
The lower end end surface 20 of the front plate 10 is preferably in full contact with the abutting surface 19a and the connecting surface 19b of the lower end recess 19, and in some cases may be closely opposed to each other.

What is important here is that the vertical abutment surface 19a of the recess 19 is stepped outward from the inner surface tOa of the front plate 10 within the thickness range of the front plate 10, so that the lower end end surface 20 of the dust cover 12 goes around to the outside of the inner surface tOa of the front plate 10 and directly communicates with the outside directly under the inner surface of the front plate 10. There is no gap g as in the conventional case. In other words, the lower end surface 2 of the dust cover 12 with respect to the recess 19
Even if there is a defect in the end of 0, the gap g created between 1 and 19 and 20 is bypassed, so dust is difficult to enter from the lower part into the tape insertion space S between the front plate 10 and the dust cover 12.

Incidentally, the shape of the recess 19 is as shown in the above embodiment.

If the connecting surface 19b is formed with a downward slope,
The lower end surface 20 of the dust cover 12, which matches the shape of the recess 19, naturally has a vertical abutting surface 20a and an inclined surface 2.
0b.

Since the upper end corner of the tip surface 20 is chamfered, even if the dimensions of the butt between the tip surface 20 and the four parts 19 are set strictly, the tip surface 20 can smoothly wrap around and fit into the recess 19. However, the perpendicular abutment surface portion 20a and the inclined surface portion 20b are likely to come into close contact with the vertical abutment surface 19a and the connection surface 19b, respectively.

Note that the present invention is not limited to the above-mentioned embodiment.1 For example, as shown in FIG.
A recess 21 is formed at the corner between the tip surface 20 and the inner surface at the lower end of the
The lower end of the dust cover 12 may be in surface contact with the lower end of the inner surface 10a of the front plate 10, and with the abutting surface 19a and connecting surface 19b of the recess 19, respectively.

Further, as shown in FIG. 8, a recess 19 is formed at the corner where the inner surface 10a and the lower end surface 10b of the front plate 10 of the first front cover 9 intersect, and a portion of the recess 19 corresponding to the connecting surface 19b is formed. The circular protrusion 23 formed at the tip of the lower end 12b of the dust cover 12 may be formed into a concave curved surface and fit loosely into the recess 19.

Further, as shown in FIG. 9, the corner where the inner surface 10a and the lower end surface 10b of the front plate 10 intersect is formed into an inclined contact surface 19a, and the tip end surface 20 of the lower end 12a of the dust cover 12 is formed on the front plate 10. It may be formed into an inclined surface that makes surface contact with the oblique contact surface 19a on the side.

Further, the design can be changed as appropriate, such as by forming a recess 19 in the lower end of the inner surface 10a of the front plate 10 and fitting the lower end of the dust cover 12 into the recess 19.

In addition, the mechanism for moving the dust cover 12 up and down in conjunction with the opening/closing operation of the front cover 9 may also use a link mechanism instead of the cam groove 17 and cam follower 15 described above. Further, the top plate portion 12a of the dust cover 12 does not have to completely seal the opening top surface of the pocket 7 when the front lid 9 is closed.

As explained above, according to the present invention, when the front cover 9 is closed, the lower end of the dust cover 12 wraps around the lower end of the front plate 10 of the front cover 9 to the outside than the inner surface 10a of the front plate 10. It was designed so that they were in contact with each other or closely facing each other. Therefore, the lower end of the dust cover 12 is connected to the front plate 10.
Even if the dust cover 12 does not come into close contact with the front plate 10, which may result in poor contact, the gap g created between the lower end of the dust cover 12 and the front plate 10 will not be in a direct line but will be detoured. When using the tape 2, dust may enter from below the pocket 7.
A simple structure can effectively and reliably prevent adhesion to surfaces.

[Brief explanation of the drawing]

FIG. 1 is an external perspective view of a tape cartridge according to the present invention, FIG. 2 is a partially cutaway vertical side view, and FIG. 3 is a plan view. Fig. 4 is a plan view of the main parts showing the relationship between the front lid and the dust cover, which are the constituent members of the present invention, and Fig. 5 is a longitudinal side view thereof.
FIG. 6 is an enlarged longitudinal sectional side view of the main part. FIG. 7, FIG. 8, and FIG. 9 are longitudinal sectional side views of essential parts showing different embodiments of the present invention. FIG. 10 is a longitudinal sectional side view of the main parts of the conventional example. 1... Main body case. 2...Tape. 3...Tape reel. 6...Tape guide member. 7...Bokello 9...Front lid. 10...Front plate of front lid. 10a...Inner surface of the front plate. 11... Connecting piece of front lid. 12...Dust cover. 12b...Lower end of the dust cover. 13...Axis. 15...Cam follower. 16...Bracket. 17...Cam groove. 19... Concavity. 19a...Top side. 19b...Connection surface. 20... Tip surface of the lower end of the dust cover. Patent Applicant: Hitachi Maxell Ltd. Figure 4 Figure 5 Figure 9 Figure 6 Figure 8 Figure 1O

Claims (1)

[Scope of Claims] +l) A main body case l which houses a tape reel 3 on which a tape 2 is wound, and a recess formed in the left and right center of the front edge of the main body case 1 to facilitate tape loading on the magnetic recording device side. A pocket 7 into which a member can be inserted, and connecting pieces 11 , 11 are connected rearward to the left and right ends of the front plate 10 , and the front plate 10 is attached to the left and right side walls of the main body case 1 via the left and right connecting pieces 11 , 11 . A front lid 9 is pivotably connected to enable switching between a front closed position and an upwardly opened position. It is provided with a dust cover 12 which is disposed at the location where the pocket 7 exists and closes the inner side including the lower side of the tape 2 running inside the front plate 10 of the front cover 9 in the closed position. Front lid 9 when the lower end is in the closed position
The tape cartridge is arranged to abut or closely face the front plate 10 of the front plate 10 in a state that extends outward from the inner surface 10a of the front plate 10.