JPS6331257Y2 - - Google Patents

Description

[Detailed description of the invention] This invention is a tape cartridge that, when loaded into a recording/playback device, releases the reel brake using a tape end detection lamp on the side of the recording/playback device that is inserted into the main body case. This is how it was done.

In a typical video magnetic tape cartridge, a reel brake is applied to prevent the tape reel inside the main body case from rotating and loosening when not in use. And when I loaded it into the video deck,
The brake release member on the video deck side is inserted into the main body case and the reel brake is released, and the tape end detection lamp on the video deck side is also inserted into the main body case so that the beginning and end of the tape can be optically detected. ing.

However, conventionally, an insertion hole for a brake release member and an insertion hole for a tape end detection lamp were separately provided through the bottom wall of the main body case. Therefore, the shape of the main body case becomes complicated, which is disadvantageous in that dust easily enters the main body case. In addition, when attempting to downsize the tape cartridge, there is a disadvantage in that the installation of the reel brake means and the like is restricted due to the position, resulting in a lack of space.

Focusing on this fact, this invention eliminates the dedicated insertion hole for the brake release member and uses only the insertion hole for the tape end detection lamp, and the tape end detection lamp also has the function of the brake release member. The purpose is to eliminate the problems of the conventional system.

A further object of the present invention is to improve the arrangement position of the lamp insertion hole and the brake piece for applying the reel brake, thereby effectively detecting the tape end accurately and preventing tape slack.

In other words, in the present invention, insertion holes for tape end detection lamps are provided through the front left and right positions of the bottom wall of the main body case, and support shafts installed from the bottom wall of the case are installed in the vicinity of each lamp insertion hole. The pair of brake pieces are each pivoted horizontally,
A part of each brake piece is placed over each lamp insertion hole to enable the brake release operation of each brake piece using the tape end detection lamp on the deck side. It is swing-biased so that it abuts and engages the engaging teeth from the front.

The details will be explained below based on the drawings.

1 and 2 show an example of a video tape cartridge, the main body case 1 of which is made up of upper and lower plastic cases 1a and 1b joined together in a lid-like manner. The tape reels 3, 3 on which the tape 2 is wound are positioned over the transparent drive shaft insertion holes 5, 5 in the case bottom wall 4 and rotatably mounted, and tape guide members 6, 6 are disposed, and the tape 2 is led out from one tape reel 3 to the front of the case via these tape guide members 6, 6, and wound onto the other tape reel 3.

A pocket 7 into which a tape loading pin is inserted is formed in the front of the main body case 1.
A front cover 8 for protecting the tape is pivotally attached to the front side of the tape so that it can be opened and closed, and when the video deck is loaded, the front cover 8 opens upward and the tape 2 can be pulled out to the front of the case.

Each tape reel 3 has flanges 1 on the top and bottom of the hub 9.
0, 11, and engagement teeth 12 are continuously formed on the outer periphery of the lower flange 11, and is constantly pressed by both free ends of a leaf spring 14 fixed to the inner top surface 13 of the main body case 1. It is biased downward.

The tape 2 has a transparent leader tape and a trailer tape connected to both ends thereof.

Lamp insertion holes 15, 15 are transparently provided on the front left and right sides of the case bottom wall 4 at positions near the left and right center behind the tape guide members 6, 6, and when the tape cartridge is loaded into the video deck, the tape on the video deck side is inserted. An end detection lamp 16 is inserted into each lamp insertion hole 15, and the end detection lamp 16 is inserted into each lamp insertion hole 15.
The light from the tape 2 passes through the transparent tape portions at both ends of the tape 2 and enters the transparent holes 17 and 1 in the left and right side walls of the main body case 1.
7 and reaches the tape end sensor (start sensor/end sensor) on the video deck side, where the starting and ending ends of the tape 2 are detected. In FIG. 1, the symbol P indicates the sensor optical path.

In FIGS. 3 to 5, support shafts 18 are provided upright from the case bottom wall 4 at positions near the lamp insertion holes 15 on the left and right front sides of the main body case, and a pair of brake pieces 19 are attached to each support shaft 18. The intermediate boss portions 19a are fitted and pivotally supported so as to be horizontally swingable, and each brake piece 19 is brought into a position where its tip 19b abuts and engages with the engagement teeth 12 of each tape reel 3 facing each other using a spring member 20. The base end 1 of each brake piece 19 is energized by swinging.
9c facing above each lamp insertion hole 15. When the tape end detection lamp 16 is inserted into the lamp insertion hole 15, the lamp 16 comes into contact with the base end 19c of each brake piece 19, causing each brake piece 19 to move so that its tip 19b is The spring member 20 is in a position where it is removed from the engaging teeth 12 of the tape reel 3.
The basic structure is such that it is forced to swing against the

However, the lamp 16 is a cover 16b of the light source 16a.
The upper end of each brake piece 19 has a conical shape.
The lower surface of the base end portion 19c of the cover 16b is formed into an inclined guide surface 21, and the upper end of the cover 16b is formed on the inclined guide surface 21.
It is designed so that it acts in contact with the In addition, the base end 19c of each brake piece 19 is raised high to block external light from the transparent window 22 provided in the upper case 1a, thereby preventing malfunction in detecting the end of the tape.

Furthermore, the contact force of each brake piece 19 to each tape reel 3 by the spring member 20 increases
is set so that it acts in the direction of arrow A in the figure, that is, in the direction of moving it toward the rear of the case, to prevent as much as possible the occurrence of tape slack due to the tape reel 3 moving toward the front of the case when not in use. I have made it possible. The spring pressure of the spring member 20 does not need to be sufficient to push the tape reel 3 toward the rear of the case.

Note that the brake piece 19 may be used instead of the above embodiment.
has a boss portion 19a at its base end, and this boss portion 19a is pivotably fitted onto the support shaft 18 so that the intermediate portion of the brake piece 19 faces above the lamp insertion hole 15. Good too.

As explained above, according to the tape cartridge according to the invention, the transparent lamp insertion hole 15 in the case bottom wall 4 is a hole into which the original tape end detection lamp 16 is inserted, and at the same time, the reel brake It also serves as a release hole. Therefore, the number of holes provided through the case bottom wall 4 can be reduced, so that the internal shape of the main body case 1 can be improved as a means for preventing dust from entering the case through the through holes. This can be simplified as much as possible, and the brake piece 19 can be effectively arranged using the lamp insertion hole 15, which is particularly advantageous when trying to downsize the tape cartridge. In particular, in the present invention, lamp insertion holes 15, 15 are provided at the front left and right positions of the bottom wall 4 of the main body case 1, and a pair of lamps 16, 16 are inserted into each lamp insertion hole 15, 15.
Each shall be inserted separately. Therefore, the lamp 16 is located at the front central portion of the main body case 1.
Unlike the case where the tape is inserted, the lamp 16 is close to the tape 2 and the sensor optical path P is also short, so it is less susceptible to disturbance from incident light from the outside, and the tape end detection is accurate and malfunctions are avoided. It can be made into something that doesn't exist. Then, each brake piece 19 has its tip 19b connected to each tape reel 3 on the left and right from the front.
Since each tape reel 3 is biased so as to abut and engage, it acts to press each tape reel 3 toward the rear of the case, and is also effective in preventing the tape 2 from loosening toward the front of the case.

[Brief explanation of the drawing]

The drawings show an embodiment of the tape cartridge according to the present invention, and FIG. 1 is a partially cutaway plan view;
Figure 2 is a cross-sectional view taken along the - line in Figure 1, Figure 3 is a plan view of the main parts, and Figure 4 is a - line sectional view in Figure 3.
A line sectional view and FIG. 5 are perspective views of important parts. 1...Body case, 2...Tape, 3...Tape reel, 4...Bottom wall of main body case, 11...Flange, 12...Engaging tooth, 15...Lamp insertion hole, 16...Tape end Detection lamp, 18...
... Support shaft, 19 ... Brake piece, 20 ... Spring member.

Claims (1)

[Scope of Claim for Utility Model Registration] Flanged tape reels 3, 3 on which the tape 2 is wound are placed on the left and right sides of the inside of the main body case 1 above the drive shaft insertion holes 5, 5 transparently provided in the bottom wall 4 of the main body case 1. At least the tape reel 3 should be rotatably mounted, the engaging teeth 12 should be formed on the outer periphery of the flange 11 of each tape reel 3, and tape end detection lamps should be provided at the front left and right positions of the bottom wall 4 of the main body case 1. 16, 16 lamp insertion holes 15, 15 are transparent, respectively; and on the front left and right sides of the main body case 1, there are support shafts erected from the bottom wall 4 in the vicinity of each lamp insertion hole 15, 15. A pair of brake pieces 1 via 18, 18
9 and 19 are each pivoted so as to be horizontally swingable, a portion of each brake piece 19 and 19 faces above each lamp insertion hole 15 and 15, and each brake piece 19 and 19 is attached to its tip. 19b,1
9b is provided with means 20, 20 for swinging and biasing the tape reels 3, 3 into a position in which they abut and engage with the engaging teeth 12, 12 of each tape reel 3, 3 from the front; The tape end detection lamp 16 is brought into contact with a part of each brake piece 19, and the brake piece 19 is swung to a position where its tip is removed from the engagement teeth 12 of the tape reel 3. A tape cartridge featuring the following.