JPH0138763Y2 - - Google Patents

Description

[Detailed explanation of the invention] This invention is a video tape recorder (hereinafter referred to as VTR).
The present invention relates to a tape braking device for a video tape recorder that applies braking to one reel during the tape loading and unloading operations.

Conventionally, in a VTR, the appropriate back tension applied to the magnetic tape during loading is applied to both the supply reel and the take-up reel. Therefore, the magnetic tape is mainly pulled out from one reel, which has the weaker force, and when unloading, It was wound onto one reel to take up the slack. This has the disadvantage that the position of the tape on the reel moves due to repeated loading and unloading operations. Furthermore, the amount of movement of the magnetic tape currently results in different results depending on the diameter of the tape and the type of cassette tape.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tape braking device for a video tape recorder that can eliminate the above-mentioned conventional drawbacks and reduce the amount of tape movement.

The present invention includes a loading drive member that drives a loading member for pulling out a magnetic tape, and a first operation member that is driven in conjunction with the operation of the loading drive member immediately after the loading and unloading operations of the loading drive member start and immediately before the end. and a second operating member, and a brake member group formed to brake one reel only during the stroke, excluding immediately before and immediately after the end of loading and unloading, in conjunction with the operation of the first operating member and the second operating member. It has been established.

An embodiment of the braking device for a video tape recorder according to the present invention will be described below with reference to FIGS. 1 to 4. Reference numeral 1 denotes a chassis, and a large number of parts described below are attached to the chassis 1. 2 is a capstan motor that drives the capstan 3;
A pinch roller 4 presses and presses a magnetic tape (not shown) against the capstan 3. 5 is a cylinder motor that drives the cylinder 6, and 7 is a loading motor 9 that drives the loading drive member 8 of the loading worm wheel, which is a reel motor. 10 is a supply reel, 11 is a take-up reel, and 12 is a supply sub-brake, which is a friction member 12b rotatably attached to a shaft 12c (see FIG. 2) and brakes the supply reel 10.
It has a pin 12a at its end that is engaged with an elongated hole 13a of the sub-brake drive arm 13. 1
4 is a sub-brake operation arm with one end connected to the shaft 14c
It is rotatably mounted with a pin 14a and an elongated hole 14b. 15 is a sub-brake operating rod, and 16 is a brake spring.

17 and 18 are Roden Rod 27c respectively.
This is the loading member for the supply loading pin and take-up loading pin attached to the.
19 is a first operating member of the brake rod operating arm that operates the sub-brake operating rod 15; 20 is a second operating member of the pinch roller operating arm that moves the pinch roller 4 to the crimping position;
Reference numeral 1 denotes a pinch roller operating rod that connects the pinch roller 4 and the second operating member 20. Sub-brake operation rod 15, brake spring 16,
A brake member group 28 is formed by the sub-brake drive arm 13, the supply sub-brake 12, the pinch roller operating rod 21, the brake operating spring 25 for returning the sub-brake operating rod, the pinch roller arm 29 of the pinch roller 4, and the like. 22 is pinch roller pressure spring 2
4 is a pinch roller pressing arm for pressing the pinch roller 4; 23 is a pinch roller operation spring for moving the pinch roller 4 from the pressing position to the release position; and 26 is a catcher for holding and fixing the loading pin 18.

FIG. 2 shows the stopped state before the tape loading operation, and by rotating the loading drive member 8 of the loading worm wheel in the direction of arrow A, the brake rod is operated by the pin 8c set on the loading drive member 8. The first operating member 19 of the arm is rotated in the direction of arrow B and is stopped in the state shown in FIG. By rotating the first operating member 19, the sub-brake operating rod 15 is moved to the brake operating spring 2.
The sub-brake operating rod 15 is pressed and driven in the direction of the arrow C against the tension of the sub-brake operating rod 15.
The sub-brake drive arm 1 is urged to rotate about the shaft 13c by the brake spring 16.
The pin 13d on the top 3 is rotated in the direction of arrow D. Therefore, the supply sub-brake 12 fitted in the elongated hole 13a on the sub-brake drive arm 13 is rotated in the direction of the arrow H, and the supply reel 1 is rotated.
Friction member 12 of supply sub-brake 12 to 0
The pressing contact caused by b is released. In this operation, the pinch roller 4 is pulled by the pinch roller operation spring 23 and released from pressure contact with the capstan 3.

When a play operation is performed from this stopped state, a tape loading operation is performed, and as shown in FIG. 3, the loading member of the loading pin (the loading member on the supply loading pin side is not shown) 18
Due to the movement in the direction of the arrow R, a magnetic tape (not shown) is pulled out of the cassette housing and is about to be loaded onto a predetermined tape path. FIG. 3 shows the operating position immediately after starting loading (immediately before completing unloading). With the play operation, the loading motor 7 starts rotating, and the loading drive member 8 rotates in the direction of the arrow. By also rotating the pin 8c on the loading drive member 8 in the direction of the arrow, the first operating member 19 of the brake rod operating arm receives the force of the brake operating spring 25 via the sub-brake operating rod 15 and rotates it in the direction of the arrow. move. As the sub-brake operating rod 15 moves in the direction of the arrow R, the sub-brake drive arm 13 also rotates in the direction of the arrow N due to the urging force of the brake spring 16, and the supply sub-brake 12 fitted in the elongated hole 13a also rotates. The supply sub-brake 12 is rotated in the direction of the arrow R using the pin 12a. Therefore, the friction member 12 of the supply sub-brake 12
b to supply reel 10 and brake spring 1
An operation of bringing them into pressure contact and applying a braking force using the tension shown in step 6 is performed.

Further, as the loading drive member 8 rotates in the direction indicated by the arrow, the loading member 18 is moved into the guide groove (not shown) by the loading rods 27a, 27b, 27c and the loading rod 27c that are engaged with the spring 8b on the loading drive member 8. By being wound along the direction of the arrow, the magnetic tape moves forward in the direction of the arrow H, and the magnetic tape is pulled out of the casing. At this time, since the supply sub-brake 12 is in contact with and presses the supply reel 10, the magnetic tape is pulled out and loaded only from the take-up reel 11.

As the loading drive member (loading worm wheel) 8 rotates in the direction of the arrow, the loading rods 27a, 27b, 27c are wound up and the loading member 18 is engaged with the catcher 26 and held and fixed. When the pin 8c rotates in the direction of the arrow, it kicks up one end 20b (see FIG. 4) of the second operating member 20 of the pinch roller operating arm and rotates the second operating member 20 in the direction of the arrow. By rotating the second operating member 20 in the direction of the arrow, the pinch roller operating rod 2
1 in the direction of arrow W in FIG. 4, rotate the pinch roller 4 in the direction of arrow C, and then
Crimp it. Here, as the pinch roller 4 rotates to the crimping state, the pin 4c planted on the pinch roller arm 29 of the pinch roller 4 rotates, thereby forming a long hole 14b into which the pin 4c is fitted and locked. The sub-brake operating arm 14 is rotated in the direction of the arrow y. Therefore, the pin 14a on the sub-brake operation arm 14 raises the sub-brake drive arm 13 against the tension of the brake spring 16 and rotates it in the direction of the arrow mark, thereby moving the supply sub-brake 12 in the direction of the arrow mark. The friction member 12b is removed from the supply reel 10 by rotating in the direction shown in FIG.

Furthermore, the unloading operation is performed in the exact opposite manner to the loading operation described above.

In this way, when a play operation is performed from a stopped state, the loading member 18 pulls out the magnetic tape from inside the cassette case, applies braking force to the supply reel 10 for a short period of time during this pulling process, and then releases the braking force when loading is complete. unlock. Then, if you perform other operations from the play state, it will go into the unloading state, and the supply reel 1 will also be in the unloading state.
0, braking is applied only during most of the unloading and is released upon completion of unloading. In this manner, during loading and unloading, the tape is pulled out from only one reel and wound onto the reel from which it was pulled out, so that movement of the tape position can be prevented.

In the above embodiment, the case where the brake is applied to the supply reel side has been described, but the effect is the same even if the brake is applied to the take-up reel side.

Since the tape braking device of the video tape recorder of this embodiment is configured as described above, by applying braking force to one reel only during most of the loading and unloading steps, loading and unloading can be repeated. This can prevent the tape position from moving forward or from moving as described below. Furthermore, since the amount of movement of the magnetic tape is small due to loading, it is easy to provide an additional mechanism for cueing functions by fast forwarding and rewinding. When recording continuously on a single tape, such as during scheduled recording, problems such as unrecorded portions occurring at the seams of recordings, or overlapping recording onto a portion of the previous recording section and cutting are avoided. You can do less.

As described above, the tape braking device for a video tape recorder of the present invention has the advantage of being able to reduce the amount of tape movement, making it easier to accommodate a mechanism for adding a cueing function.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the tape braking device for a video tape recorder of the present invention, FIG. 2 is a plan view of the main part of the braking device shown in FIG.
FIG. 4 is a plan view showing a state immediately after loading is started or immediately before unloading is completed by a play operation from the state shown in the figure, and FIG. 4 is a plan view showing a state from the state shown in FIG. 3 to a state where loading is completed. 6...Cylinder, 8...Loading drive member,
10... Supply reel, 11... Take-up reel, 17, 18... Loading member, 19...
...First operating member, 20... Second operating member, 28...
...Brake parts group.

Claims (1)

[Scope of utility model registration request] It has a loading mechanism that pulls out the magnetic tape in a housing with two reels and winds it around a cylinder with a rotating head to form a predetermined tape path.
In a video tape recorder that uses only one reel to supply the magnetic tape that is pulled out from the housing and to wind the magnetic tape that is rewound into the housing during unloading, the magnetic tape is pulled out from inside the housing. A loading drive member that drives the loading member, a brake arm that has a braking member at one end and brakes one of the two reel stands, and is driven by the loading drive member and unloading is completed. a first operating arm that operates the brake arm to release braking on the reel stand, and operates the brake arm to apply braking to the reel stand when a loading operation is started;
A second operating arm is driven by the loading drive member, and when the loading operation is completed, pinches the magnetic tape to the capstan and presses the pinch roller, and also operates the brake arm to release the brake on the reel stand. and
A tape braking device for a video tape recorder, characterized in that the brake arm is actuated by the loading drive member.