JPH0731424Y2 - Reel breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a reel brake device, and in particular, an engaging portion is provided on the outer peripheral portion of one flange, and a brake lever is engaged with this engaging portion to reel the reel. The present invention relates to a reel brake device adapted to perform braking of the above.

[Outline of the Invention] In the present invention, an arm is provided on a brake lever for braking a reel, and when the brake lever moves axially in the direction of the other flange, the arm has an outer peripheral portion of the other flange. To prevent damage to the tape-shaped recording medium wound around the reel by the claw portion at the tip of the brake lever.

[Prior Art] A tape cassette has been conventionally used for recording and / or reproducing by a VTR. This tape cassette is as shown in FIGS. 7 and 8.
The magnetic tape 1 is wound around a reel hub 2. The reel hub 2 is provided with upper and lower flanges 3 and 4 and is housed in a predetermined position in the lower half 5. A pawl 7 formed at the tip of the brake lever 6 is rotationally biased by a spring 9 so as to engage with a gear-shaped engaging portion 8 formed on the outer peripheral surface of the lower flange 4, This prevents the magnetic tape 1 from loosening when not in use.

[Problems to be Solved by the Invention] When assembling a tape cassette equipped with such a reel, as shown in FIG. 8, in particular, flow on the conveyor without the upper half forming the cassette casing. It has become. Therefore, the brake lever 6 is lifted upward due to vibrations, etc.
Is a gear-shaped engaging portion 8 formed on the outer peripheral portion of the flange 4.
There is a possibility that the magnetic tape 1 may be damaged by coming into contact with the outer peripheral surface of the magnetic tape 1 as shown in FIG. When the magnetic tape 1 is damaged in this way, a problem occurs that the defective rate of the tape cassette increases.

The present invention has been made in view of these problems, and in the process of assembling the tape cassette, even if the brake lever for preventing rotation of the reel rises,
An object of the present invention is to provide a reel brake device in which a tape-shaped recording medium wound around a reel is not damaged.

[Means for Solving Problems] According to the present invention, flanges are provided at both ends in the axial direction of a reel around which a tape-shaped recording medium is wound, and engaging portions are provided on the outer peripheral side of one flange. In a device for braking a reel by engaging a claw of a brake lever with a portion, a boss portion is provided at an intermediate position in the length direction of the brake lever, and the brake lever can be rotated at the boss portion. The brake lever engaging portion is provided on one end side with respect to the boss portion, and the pawl is provided on the other end side with respect to the boss portion, and the pawl engages with the engaging portion of the flange by a spring. The brake lever is urged to rotate in such a manner that an arm extending in a direction substantially parallel to the axial direction of the reel near the claw is provided on the brake lever, and Wherein the dimension between opposite end portions of the farther from each other the arm and the pawl in the linear direction 2
When the brake lever is moved in the axial direction, the arm comes into contact with the outer peripheral portion of another flange before the pawl is disengaged from the engaging portion of the flange. The pawl is prevented from rotating so that the pawl is inserted between the flanges at both ends and enters the center side of the reel so that the pawl does not come into contact with the tape-shaped recording medium wound around the reel. It was done.

[Operation] Therefore, according to the present invention, even if the brake lever is lifted up when the tape cassette is assembled, the arm contacts the outer peripheral portion of the other flange, so that the tape is wound around the reel. It is possible to prevent the tape-shaped recording medium from coming into contact with the tape-shaped recording medium, thereby preventing the tape-shaped recording medium from being damaged.

[Embodiment] The present invention will be described below with reference to an embodiment shown in the drawings. 2 and 3 show an essential part of a tape cassette for a VTR according to an embodiment of the present invention. A reel hub 12 is arranged in a cassette casing 11 shown by a chain line in FIG. It is like this. The reel hub 12 is provided with flanges 13 and 14 at both ends in the axial direction. A magnetic tape 15 is wound around the outer peripheral surface of the reel hub 12 between the flanges 13 and 14. A brake lever 16 is arranged near the reel hub 12 and engages with a gear-like engaging portion 17 formed on the lower flange 14 of the reel hub 12 to prevent the reel hub 12 from rotating.

Explaining the brake lever 16 in more detail, the lever 16 has a boss portion 18 approximately at the center in the lengthwise direction, and the boss portion 18 has a pin 11 implanted in the half 11.
19 is fitted, and is urged to rotate by a spring 20 wound around the pin 19. The lever 16 is provided with a locking projection 21 for locking the spring 20. A claw 22 is formed at the tip of the lever 16 and is engaged with the gear-shaped engaging portion 17.

Further, an arm 23 is formed on the lever 16 so as to come into contact with the upper flange 13 when the brake lever 16 is lifted. That is, the dimension between the ends of the arm 23 and the pawl 22 on the opposite side in the axial direction of the reel 12 away from each other is larger than the dimension between the upper and lower flanges 13 and 14, and the brake lever 16 is a pin. The arm 23 comes into contact with the outer peripheral portion of the upper flange 13 before the pawl 22 is lifted up along the line 19 and is disengaged from the engaging portion 17 of the flange 14. The spring 20 is also used as the spring of the lock lever 24. The lock lever 24 is for locking the cassette lid 25 in the closed state.
It is adapted to be engaged with the engagement holes 26 of 25. The end of the reel brake 16 opposite to the claw 22 with respect to the boss 18 is a brake lever engaging portion 27, and an operating member (not shown) engages with this engaging portion 27 to prevent the reel brake from engaging. It is designed to be released.

In the structure described above, the brake lever 16 shown in FIG. 3 is urged to rotate by the spring 20, and the claw 22 provided on the tip side thereof is formed on the outer peripheral surface of the lower flange 14. It is adapted to engage with the gear-shaped engaging portion 17,
This prevents the reel hub 12 including the flange 14 from rotating. Therefore, the brake lever 16 prevents the reel hub 12 from rotating unintentionally, and the magnetic tape in the casing 11 is prevented.
15 will be prevented from sagging.

Further, the brake lever 16 has an arm 23 as described above.
Are formed. The arm 23 contacts the upper flange 13. That is, since the dimension between the upper end of the arm 23 and the end of the claw 22 on the lower end side in the axial direction of the reel 12 is larger than the distance between the upper and lower flanges 13 and 14, the brake lever 16 is Boss 18 pin
Even if it floats so as to move upward with respect to 19, the arm 23 contacts the outer peripheral portion of the upper flange 13 before the pawl 22 separates from the gear-like engaging portion 17 of the lower flange 14. Has become.

Therefore, even when the brake lever 16 is lifted due to vibration when moving on the conveyor in a state where the upper half of the cassette casing 11 is not assembled, the arm 23 of the lever 16 moves upward as shown in FIG. Flange 13
Of the brake lever 16 is prevented from coming into contact with the magnetic tape 15. Therefore, the magnetic tape 15 can be prevented from being damaged, and the number of defective tape cassettes can be reduced. Alternatively, the step of inspecting the magnetic tape 15 for damage by the brake lever 16 is not necessary.

The shape of the arm 23 is not necessarily limited to that shown in FIG. 1, but may be the shape shown in FIG. In this case, an arm 23 is formed so as to extend above the claw 22 and an engaging projection 28 is provided on the front surface of the arm 23 so that the arm 23 also serves as a spring hook. Therefore, with such a configuration, it is possible to further simplify the structure of the brake lever 16.

Alternatively, as shown in FIG. 5, the arm 23 may be connected to the side of the locking projection 21 that locks the spring 20. In this case, it is desirable that the height of the arm 23 is slightly higher than that of the locking projection 21 so that the arm 23 surely contacts the upper flange 13. Alternatively, as shown in FIG. 6, it is possible to form the arm 23 on the back side of the locking projection 21 so as to extend obliquely rearward.

[Advantages of the Invention] As described above, the present invention provides a boss portion at an intermediate position in the longitudinal direction of the brake lever, rotatably supports the brake lever at the boss portion, and supports the brake lever at one end side with respect to the boss portion. Along with the brake lever engaging part, a claw is provided on the opposite side to the boss part, and the spring biases the brake lever so that the claw engages with the engaging part of the flange. , The brake lever is provided with an arm extending in a direction substantially parallel to the reel axial direction, and the dimension between the arm and the claw end on the opposite side in the reel axial direction which is farther from each other is larger than the distance between the two flanges. However, when the brake lever moves in the axial direction, the arm comes into contact with the outer peripheral portion of the other flange before the pawl is disengaged from the engaging portion of the flange. The brake lever is prevented from rotating so as to enter the center of the reel so that the pawl does not come into contact with the tape-shaped recording medium wound around the reel.

Therefore, according to the present invention, when the brake lever floats and moves in the axial direction of the reel, the arm comes into contact with the outer peripheral portion of another flange before the pawl is disengaged from the engaging portion of the flange. This prevents the claws of the brake lever from interfering with the tape-shaped recording medium wound on the reel between the flanges at both ends.
It is possible to avoid damaging the tape-shaped recording medium.

[Brief description of drawings]

FIG. 1 is an external perspective view of a brake lever constituting a reel brake device according to an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of a reel engaged with the brake lever, and FIG. 3 is equipped with a reel. FIG. 4 is a perspective view of a brake lever according to a modification, FIG. 5 is a perspective view of a brake lever according to another modification, and FIG. 6 is a perspective view of another modification. An external perspective view of such a brake lever,
FIG. 7 is a vertical cross-sectional view of a reel in which a brake lever of a conventional tape cassette is moved upward, and FIG. 8 is a plan view of essential parts of a tape cassette including the reel. The names of the main parts in the drawings are as follows. 12 …… Reel hub 13 …… Upper flange 14 …… Lower flange 15 …… Magnetic tape 16 …… Brake lever 17 …… Gear-like engaging part 18 …… Boss part 19 …… Pin 20 …… Spring 21 …… For engaging Protrusion 22 …… Claw 23 …… Arm 27 …… Brake lever engaging part 28 …… Engaging protrusion

Claims (1)

[Scope of utility model registration request] Claims: 1. Flanges (13) and (14) are provided at both ends in the axial direction of a reel around which a tape-shaped recording medium (15) is wound, and an engaging portion (17) is provided on the outer peripheral side of one flange (14). And a hook (22) of the brake lever (16) is engaged with the engaging portion (17) to brake the reel, the intermediate position in the longitudinal direction of the brake lever (16). A boss portion (18) is provided on the boss portion (18), the brake lever (16) is rotatably supported by the boss portion (18), and a brake lever engaging portion (27) is provided on one end side with respect to the boss portion (18). And the claw (22) is provided on the other end side with respect to the boss (18), and the claw (22) causes the flange (14) to move by a spring (20).
The brake lever (16) is rotationally biased so as to be engaged with the engaging portion (17) of the arm (23), and the arm (23 extending near the claw (22) in a direction substantially parallel to the axial direction of the reel. ) Is provided on the brake lever (16), and the dimension between the opposite ends of the arm (23) and the pawl (22) in the axial direction of the reel is the two flanges (13).
When the brake lever (16) moves in the axial direction,
Before the pawl (22) is disengaged from the engaging portion (17) of the flange (14), the arm (23) is attached to another flange (1).
The brake lever (16) is rotated so that the claw (22) comes into contact with the outer peripheral portion of 3) and enters the center side of the reel between the flanges (13) and (14) at both ends. A reel brake device, characterized in that the claw (22) is prevented from coming into contact with the tape-shaped recording medium (15) wound around the reel.