JPS6338789B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention is a tape cassette that is most suitable for application to a recording/reproducing device such as a video tape recorder. The present invention relates to a tape cassette in which the rotation of both reels in the tape feeding direction is restricted by engaging the ratchet portions of a pair of reels.

[Summary of the invention]

The present invention provides a slidable sliding body having a pair of locking pawls, and presses this sliding body with a biasing means to engage both of the locking pawls with the ratchet portions of the pair of reels. In a tape cassette that restricts the rotation of the tape in the tape feeding direction, by providing a pair of notches in the rear end surface of the sliding member and the rear wall of the lower half, the rear end surface of the sliding member and the rear wall of the lower half are The biasing means can be inserted extremely easily between the two.

[Conventional technology]

This type of tape cassette is provided with a reel locking device to prevent the reel housed inside from being accidentally rotated when the tape cassette is not in use. Conventionally, a ratchet portion is formed on the outer periphery of a pair of reels that are rotatably housed.
A sliding body is provided so as to be able to move in and out of the intermediate portion of both reels, and this sliding body is provided with a pair of elastic locking pawls that are engaged with the ratchet portions, respectively. The movable body is pressed by the biasing means to slide toward the intermediate portion, thereby causing the locking pawls to engage with the ratchet portions, thereby regulating the rotation of the reels in the tape feeding direction. Something was warm.

[Problem that the invention seeks to solve]

Conventionally, a compression spring, for example, has been inserted between the rear end surface of the slider and the rear wall of the lower half as a biasing means for the slider. Both locking pawls must be securely engaged with the ratchet portions of both reels. Therefore, it is necessary to insert the compression spring with an initial stress applied thereto, and conventionally this insertion has been done while compressing the compression spring while holding down the sliding body manually. For this reason, the work was extremely troublesome and time consuming, resulting in poor work efficiency. Further, when replacing the compression spring, it is troublesome to take out the compression spring, which is extremely inconvenient during repair.

Therefore, the present invention allows the biasing means to be inserted extremely easily between the rear end surface of the sliding member and the rear wall of the lower half.

[Means for solving problems]

The present invention provides a pair of notches facing each other in a rear end surface of the sliding body opposite to the locking pawl and a rear wall of the lower half opposite to the rear end surface, and is formed by cutting out the upper end surface of the sliding body and the upper end surface of the rear wall.

[Effect]

According to the present invention, since a pair of notches are provided in the rear end surface of the sliding body and the rear wall of the lower half,
The biasing means is inserted between the rear end surface of the slider and the rear wall of the lower half while being held by an insertion member or the like,
After the biasing means is brought into contact with the rear end surface and the rear wall, the insertion member etc. can be removed. Therefore, the biasing means can be inserted very easily.

〔Example〕

An embodiment in which the present invention is applied to a tape cassette for a video tape recorder will be described below with reference to the drawings.

First, as shown in FIG. 3, a tape cassette 1 is made up of upper and lower halves 2 and 3 molded from synthetic resin that are fitted together, and a magnetic tape (hereinafter simply referred to as tape) 4 is wound inside this tape cassette 1. A pair of left and right tape reels 5 and 6 are rotatably housed. The tape 4 is passed along the front opening 7 of the tape cassette 1, and when the tape cassette 1 is installed in the cassette mounting position of a video tape recorder (not shown), the tape cassette 1
A loading means is inserted into the bottom opening 8 of the
The tape 4 is configured to be loaded. In addition, 9 is a front lid that covers the front opening 7, 10 and 11 are reel hubs of tape reels 5 and 6, and 12
and 13 are a pair of left and right reel fitting holes provided in the bottom wall 3a of the lower half 3, and the reel hubs 10, 11 are inserted into these reel fitting holes 12, 13.
The lower ends of the two are rotatably fitted to each other.

Next, as shown in FIGS. 1 to 3, ratchet portions 15 and 16 are formed on the outer peripheries of the lower flanges 5a and 6a of both tape reels 5 and 6, respectively. On the other hand, the bottom wall 3a of the lower half 3 of the tape cassette 1 is provided with a sliding body 17 made of synthetic resin and shaped into a rectangular parallelepiped. This sliding body 17 is arranged on the rear side of the intermediate part 18 of both tape reels 5 and 6, and on both left and right sides thereof, there are a pair of guide walls 19 that are integral with the bottom wall 3a and the rear wall 3b of the lower half 3. 20 are provided. And sliding body 17
is slidable in the front-rear direction (in the direction of arrows a and b in FIG. 1) so as to be guided by both guide walls 19 and 20 so as to be able to move in and out of the intermediate portion 18. And a compression spring 2 which is a biasing means
1 is inserted with both ends thereof being in contact with the rear end surface 17a of the sliding body 17 and the rear wall 3b of the lower half 3, respectively.

Thus, the compression spring 21, which is the biasing means for the sliding body 17 described above, is configured to be inserted extremely easily between the rear end surface 17a of the sliding body 17 and the rear wall 3b of the lower half 3. That is, Figures 4 to 6
As shown in the figure, a pair of notches 28, 2 are formed on the rear end surface 17a of the sliding body 17 and the rear wall 3b of the lower half 3, which is opposed to the rear end surface 17a.
9 is provided. This pair of notches 28,2
9 is an intermediate position between both guide walls 19 and 20, and the upper end 17b of the sliding body 17 and the upper end surface 3c of the rear wall 3b.
It is notched up to. Further, 30 and 31 are a pair of spring insertion members, and both ends of the compression spring 21 are held between the spring insertion members 30 and 31. As shown in FIG. 5, the dimensions l and w of both notches 28 and 29 are larger than the dimensions l' and w' of both spring insertion members 30 and 31 (l>l', w>w'). has been done. Then, as shown in FIG. 4, both ends of the compression spring 21 are held by the spring insertion members 30 and 31 against the spring force, and are conveyed above a predetermined position. After this, the spring insertion members 30 and 31 are lowered, and the rear end surface 1 of the slider 17 is lowered as shown in FIG.
7a and the rear wall 3b of the lower half 3. Then, the spacing between the spring insertion members 30 and 31 is gradually widened, and the spring insertion members 30 and 31 enter the notches 28 and 29, respectively. At this time, the formation dimensions l and w of both notches 28 and 29 are the formation dimensions l' and w of the spring insertion members 30 and 31.
Since the spring insertion members 30 and 31 are formed larger than w', the spring insertion members 30 and 31 have both notches 28 and 29 as shown in FIG.
Go completely inside. Therefore, both ends of the compression spring 21 are connected to the rear end surface 17a of the sliding body 17 and the lower half 3, respectively.
It comes into contact with the rear wall 3b of. Then, the spring insertion members 30 and 31 are raised, and the insertion of the compression spring 21 is completed. In this way, the rear end surface 17a of the sliding body 17 and the lower half 3 are brought into contact with both ends of the compression spring 21.
Since notches 28 and 29 are provided in the rear wall 3b, respectively, the compression spring 21 can be inserted into the spring insertion members 30 and 3.
After inserting the compression spring 21 by the means described in 1 and bringing both ends of the compression spring 21 into contact with the rear end surface 17a of the sliding body 17 and the rear wall 3b of the lower half 3, the spring insertion member 3 is inserted.
0.31 can be extracted. Therefore, the compression spring 21 can be inserted very easily. Also, when taking out the compression spring 21, the spring insertion members 30, 31
The compression spring 21 can be held between the spring insertion members 30 and 31 after being inserted into the notches 28 and 29, respectively, in advance. Therefore, the compression spring 21 can be taken out very easily.

Next, as shown in FIGS. 1 to 3, a pair of left and right locking pawls 22 and 23 are provided at the front end of the sliding body 17 to engage with both the ratchet portions 15 and 16. The locking pawls 22 and 23 are integrally formed with the sliding body 17 made of synthetic resin, and are thinly molded to have appropriate elasticity.
And both the locking claws 22 and 23 are attached to the tips 22 of these
They are formed in an arcuate or inclined shape so that the distance between them increases as they reach a and 23a. Further, a pin insertion hole 24 is provided in the bottom surface of the sliding body 17. Further, in the bottom wall 3a of the lower half 3, a long hole 25 is formed in the front-rear direction and interlocks with the pin insertion hole 24. When the tape cassette 1 is mounted at the cassette mounting position of a video tape recorder, the lock release pin 26 provided at the cassette mounting position is inserted into the pin insertion hole 24 through the elongated hole 25.

The locking devices for the tape reels 5 and 6 are constructed as described above, and as shown by solid lines in FIG. Ratchet part 15,
It meshes with 16. The tape reel 5 is rotated in the direction of arrow c in FIG. 1 by the locking pawl 22.
Further, rotation of the tape reel 6 in the direction of the arrow d in FIG. 1 is prevented by the locking claws 23, respectively. Therefore, even if vibration or the like is applied to the tape cassette 1 in this state, the tape 4 passed along the front opening 7
never loosens. Also a pair of tape reels 5,
When an impact or the like is applied to the reel hubs 10 and 11 of No. 6, the tape reel 5 or 6 moves in the direction of arrow c or d in Fig. 1.
Even if rotational force in the direction is applied, the tape reel 5 or 6 will not become unlocked.

Next, when the tape cassette 1 is installed in the cassette loading position of the video tape recorder and a record button or play button (both not shown) is operated, the pair of tape reels 5 and 6 are unlocked. That is, when the tape cassette 1 is installed in the cassette mounting position, as shown in FIG. It is inserted into the pin insertion hole 24 of the sliding body 17. When the record button, playback button, etc. is operated, the lock release pin 26 automatically moves to the position shown by the imaginary line in FIG. 2 and is locked. Therefore, the sliding body 17
moves in the direction of arrow b in FIG.
The ends 22a and 23a of 23 are both tape reels 5,
It comes off from the ratchet parts 15 and 16 of 6. In this way, the locking device for the tape reels 5 and 6 locks both tape reels 5 and 6 until just before the tape cassette 1 is installed in the cassette mounting position and recording or playback operation is performed.
This is to ensure that the When the stop button (not shown) is operated after the recording or reproducing operation is completed, the second lock release pin 26 is pressed.
The lock is released at the forward position shown by the phantom line in the figure. Then, the sliding body 17 is moved back in the direction of the arrow a in FIG. 15, 16
The two tape reels 5 and 6 are reliably locked again.

Although one embodiment of the present invention has been described below, the present invention is not limited to the embodiment, and various effective changes can be made based on the technical idea of the present invention.

For example, the biasing means for the sliding conductor 17 is a compression spring 2
The material is not limited to 1, and may be a leaf spring, rubber, or the like.

The present invention is applicable to tape cassettes for various recording and reproducing devices other than video tape recorders and various other information processing devices.

〔Effect of the invention〕

As described above, the present invention provides a pair of notches in the rear end surface of the sliding body and the rear wall of the lower half.
When inserting the biasing means of the sliding body between the rear end face and the rear wall, it can be inserted very easily using an insertion member or the like. Therefore, the troublesomeness of conventional manual work is eliminated, and the work efficiency can be significantly improved. Furthermore, when the urging means needs to be replaced, it can be attached and detached very easily. It is also possible to mechanize the insertion of the biasing means, and it is also possible to automate the assembly work.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a tape cassette for a video tape recorder, and FIG. 1 is a diagram illustrating the locking and unlocking of both tape reels by both locking claws of a sliding member. FIG. 2 is a cross-sectional view taken along the - line in FIG. 1, FIG. 3 is a partially cutaway plan view of the top wall of the tape cassette, and FIG. FIGS. 5 and 6 are perspective views of the main parts showing the method, and plan views of the main parts showing the method of inserting the biasing means. In addition, in the symbols used in the drawings, 1...Tape cassette, 3...Lower half, 3b
... Rear wall, 3c ... Upper end surface, 5, 6 ... Tape reel, 15, 16 ... Ratchet part, 17 ...
sliding body, 17a...rear end surface, 17b...upper end surface,
18... Middle part, 21... Compression spring (biasing means),
22, 23...Latching claws, 28, 29...Notches.

Claims (1)

[Scope of Claims] 1. A ratchet part is formed on the outer periphery of a pair of rotatably housed reels, and a sliding member is provided so as to be able to move in and out of the middle part of both reels. The sliding body is provided with a pair of elastic locking claws that are engaged with the ratchet portions, and the sliding body is pressed by a biasing means to slide toward the intermediate portion, thereby engaging both of the above-mentioned engagements. In a tape cassette configured such that a locking pawl is engaged with both of the ratchet portions to restrict the rotation of the two reels in the tape feeding direction, a rear end surface of the sliding body opposite to the locking pawl, and a rear end surface of the slider. A pair of notches are provided in the rear wall of the lower half facing each other, and the pair of notches are cut out to the upper end surface of the sliding body and the upper end surface of the rear wall. tape cassette.