JPH042432Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a tape loading device for loading a tape onto a rotating head drum by reciprocating a tape guide block on which the tape is hooked. It is.

[Summary of the idea]

The present invention provides a tape loading device in which a tape is loaded onto a rotating head drum by the tape guide block when the tape guide block on which the tape is hooked moves back and forth on the guide rail. A cam pin is formed on one side of the guide lock, and a cam groove is formed on the other side, and the cam pin and the cam groove cooperate to cause the tape guide block to largely rotate toward the rotating head drum immediately before the loading is completed. Therefore, the slanted tape guide pin is located behind the guide roller (tape guide) during loading, but just before loading is completed, it is rotated significantly to approach the head drum side, and the tape is held at a predetermined slant. It is designed to be supplied and delivered at the corner. Therefore, during loading, the slanted tape guide pin does not pull the tape out of the reel, so there is no difference in tension between the top and bottom of the tape, which prevents the tape from stretching on one side. At the same time, the space factor is improved.

[Conventional technology]

Conventionally, a pair of tape guide blocks disposed on both sides of a rotating head drum are hooked onto tape guides and guide pins, and the tape guide blocks are moved.
A tape loading device is known in which the tape is loaded by winding the tape around a rotating head drum at a predetermined angle. In a recording/reproduction device using such a tape loading device, the tape guide block must be positioned so that a force exceeding an allowable range is not applied to the magnetic tape during loading, that is, when the tape guide block moves. It can be decided. Further, after the loading is completed, the attitude of the tape guide block is determined so that a force exceeding an allowable range is not applied to the magnetic tape when the tape runs in recording mode or playback mode. The attitude of the tape guide block during loading and the attitude of the tape guide block after loading may differ significantly depending on the model of the recording/reproducing apparatus.
For this reason, just before the loading is completed, the tape guide block is rotated greatly to change its attitude significantly, so that a force exceeding an allowable range is not always applied to the tape.

[Problem that the invention attempts to solve]

However, in the conventional tape loading device, the mechanism for largely rotating the tape guide block as described above has a complicated structure using many parts such as a timing belt and gears, and also takes up a large space. It was exactly what I needed. For this reason, the structure of the entire device becomes complicated and the device cannot be miniaturized.

[Means for solving problems]

The present invention was devised in order to solve these problems, and uses a cam pin formed on one side of the guide rail and tape guide block in cooperation with a cam groove formed on the other side. Then,
The tape guide block is configured to be rotated greatly just before loading is completed.

[Effect]

Immediately before the loading is completed, the tape guide block is largely rotated by the cam pin and the cam groove, so the number of parts required for this rotation is reduced.

〔Example〕

An embodiment in which the present invention is applied to a tape loading device for an 8 mm VTR will be described below with reference to the drawings.

First, with reference to FIG. 2, an outline of the main parts of this VTR in a loading completed state will be explained.

The 8mm VTR main body 1 is composed of a main chassis 2 and a slide chassis 3 that slides on the main chassis 1. A drum base 5 having a pair of left and right guide grooves 6, 7 is attached to the main chassis 2. The guide groove portion 6 branches into branch grooves 6a and 6b at a branch portion 6c. A rotary head drum 4 is rotatably attached to the drum base 5 in an inclined state. The slide chassis 3 has a guide groove 18.
A moving guide rail 9 in which a guide groove portion 19 is formed and a moving guide rail 10 in which a guide groove portion 19 is formed are attached. In the state immediately before the loading is completed, the end portions 9a of the moving guide rails 9, 10,
10a are in contact with the end portions 5a of the drum base 5, respectively, so the guide grooves 6 and 18 are connected to form one guide groove 30, and the guide grooves 7 and 19 are connected to form one guide groove. guide groove 3
1 is formed. Tape guide blocks 11 and 12 are slidably attached to guide grooves 30 and 31, respectively. Tape guide block 11
A tape guide 13 consisting of a guide roller is vertically attached to the tape guide 13, and a guide pin 15 is attached at an angle. A tape guide 14 consisting of a guide roller is vertically attached to the tape guide block 12, and a tape guide pin 16 is attached at an angle. The magnetic tape 17 pulled out from a tape cassette (not shown) is wound diagonally around the circumferential surface of the rotating head drum 4 at a predetermined angle via the tape guide 13 and guide pin 15 of the tape guide block 11. The tape is loaded via the tape guide 14 and guide pin 16 of the guide block 12.
In the above-mentioned loading completion state, the magnetic tape 17 mounted between the guide pin 15 of the tape guide block 11 and the rotary head drum 4 is placed in a state in which the magnetic tape 17 is not subjected to a load that exceeds the allowable range during running. pin 15
The posture and position of the object are maintained.

Next, Fig. 1A, Fig. 1B, Fig. 1C, and Fig. 3
The details of the configuration of the tape guide block 11 will be explained with reference to the drawings.

Tape guide block 11 as shown in FIG.
A guide pin 20 having a locking portion 20a formed at its tip is attached to the opposite side of the tape guide 13, and a locking portion 21a is formed at an intermediate portion of the guide pin 20 at a certain distance. A guide pin 21 is attached. Guide pin 2
The locking portion 20a of No. 0 is biased upward in FIG. 3 by a leaf spring 32a of a mounting portion 32 attached to the drum base 5. Further, the tape guide block 1 is secured by the locking portions 20a and 21a.
1 is the guide groove 3 of the drum base 5 in FIG.
It is prevented from coming off from 0. Therefore, these guide pins 20 and 21 can move along the guide groove portion 6. The connecting link 22 has one end 22
A is attached to the tip 21b of the guide pin 21, and the other end 22b is attached to a loading gear (not shown). The loading gear is comprised of first and second gears that are rotatably mounted near the rotary head drum 4 along the outer periphery of the rotary head drum 4. During loading, the tape guide block 11 reciprocates in the guide groove 30 by the clockwise rotation of the first gear, and the tape guide block 11 reciprocates in the guide groove 30 by the counterclockwise rotation of the second gear. The block 12 moves forward in the guide groove 31.

As shown in FIGS. 1A, 1B, and 1C, a cam pin 29 is integrally formed on the right outer side of the fifth guide groove 6 of the drum base.
In relation to this, the back surface of the tape guide block 11 has an opening 24 at one end, a straight section 25, a curved section 26,
A cam groove 23 consisting of a straight portion 27 and an opening 28 at the other end is formed. Therefore, when the tape guide block 11 moves forward in the guide groove 30,
The side surface of the cam groove 23 and the cam pin abut. That is, the tape guide block 11 connects the cam pin 29 and the cam groove 23 immediately before the loading is completed.
The guide pins 20 and 21 are largely rotated so as to be guided by the branch grooves 6a and 6b, respectively.

Next, the operation of the 8mm VTR body 1 having the above configuration will be explained.

As shown in FIG. 1, when loading the magnetic tape 17 onto the rotary head drum 4, the first gear is rotated clockwise. Through the connecting link 22, the tape guide block 11 moves upward in FIG. 2 within the guide groove 30 with the guide pins 20 and 21 being guided. Similarly, the second gear is rotated counterclockwise, and the tape guide block 12 moves upward in the guide groove 31 in FIG. At this time, as shown in FIGS. 1A and 1B, the cam pin 29 is first inserted into the cam groove 23 from the opening 24 at one end of the cam groove 23 of the tape guide block 11, and then the cam pin 29 is inserted into the cam groove 23. From the straight part 25 to the curved part 2
Slide up to 9. At this time, the guide pin 20 passes through the branch part 6c where the guide groove part 6 branches into branch grooves 6a and 6b, and slides to approximately the middle part of the branch groove 6a, while the guide pin 21 slides to the branch part 6c. move. Then, as shown in Fig. 1B, the cam pin 2
9 strongly contacts the lower right side wall portion 26a of the curved portion 26 of the cam groove 23, this side wall portion 26a
a receives a force directed to the right in FIG. 1B by the cam pin 29. Due to this rightward force, the tape guide block 11 in which the cam groove 23 is formed tends to rotate counterclockwise in FIG. 1B, with the guide pin 20 being approximately the center of rotation. Therefore, the guide pin 2 located at the branch part 6c
1 does not slide toward the branch groove 6a, but slides toward the branch groove 6b.

When the tape guide block 11 moves further forward,
The cam pin 29 passes through the straight portion 27 and enters the cam groove 23.
It escapes from the other end opening 28. During the escape, the guide pin 21 moves from the branching portion 6c to the branching groove 6b.
Move inside enough. Therefore, after the escape, the guide pin 21 does not slide in the branch groove 6a but slides in the branch groove 6b, and the guide pin 20 slides in the branch groove 6a. In this way, guide pin 2
Since the guide pins 20 and 21 slide in different branch grooves 6a and 6b at the branch portion C, the tape guide block 11 to which these guide pins 20 and 21 are attached is rotated significantly in the counterclockwise direction in FIG. 1B. While moving, it moves to its final forward position shown by the solid line in FIGS. 1C and 2, and loading is completed. Then, during the forward movement, tape ejection (unloading) is performed by a process completely opposite to that described above.

The present invention has been described below with reference to its embodiments, but the present invention can be modified in various ways without departing from the technical idea of the present invention. For example, in the embodiment, the cam pin 29
is provided on the drum base 5, and a cam groove 23 is provided on the tape guide block 11, but the cam pin 29 is provided on the tape guide block 11.
It is also possible to provide the tape guide block 11 with a cam groove 23 and the drum base 5 with a cam groove 23. Further, in the embodiment, the guide groove portion 6 is branched into branch grooves 6a and 6b at the branch portion 6a, but the portion separating the branch groove 6a and the branch groove 6b is removed to separate the branch groove 6a and the branch groove 6b. May be integrated.

[Effect of idea]

As described above, according to the present invention, when loading the tape onto the rotary head drum while the tape guide block hooks the tape and moves forward on the guide rail, the tape guide block A cam pin formed on one side of the rail and the tape guide block cooperates with a cam groove formed on the other to cause the tape guide block to rotate significantly. Therefore,
The slanted tape guide pin does not pull out the tape from the reel during loading, so there is no difference in tension between the top and bottom of the tape when it is pulled out, which prevents the tape from stretching on one side. Furthermore, the number of parts can be significantly reduced compared to the case where a large number of parts such as timing belts and gears are used.

Further, only small parts such as the cam pin and the cam groove are used, and since these parts can be formed integrally with the guide rail and tape guide block, almost no space is required for these parts. Therefore, the space factor becomes extremely good.

Furthermore, since the rotation is performed by a simple mechanism consisting of a cam pin and a cam groove, there is almost no possibility of failure, which improves reliability.

Furthermore, since the cam pins and cam grooves can be formed very easily, the cost for forming them is extremely low.

[Brief explanation of the drawing]

The drawings show an embodiment in which the present invention is applied to a tape loading device for an 8 mm VTR, and FIGS. 1A to 1C are diagrams explaining the operation of the tape guide block, and FIG. FIG. 3 is a plan view of the main parts, and is a vertical sectional view of the tape guide block shown in FIG. 1C. In addition, in the symbols used in the drawings, 4... Rotating head drum, 5... Drum base (guide rail),
9, 10...Movement guide rail (guide rail),
11, 12... Tape guide block, 17...
Magnetic tape (tape), 23...cam groove, 29...
...It's Kampin.

Claims (1)

[Claims for Utility Model Registration] 1. A guide rail attached near the outer periphery of a rotating head drum, and a tape guide block that is attached to the guide rail so as to be able to reciprocate and wrap tape around the rotating head drum at a predetermined angle. In the tape loading device, a guide roller and an inclined tape guide pin are attached to the upper part of the tape guide block for sequentially hooking the tape during the forward movement, and the guide rail has a branching part. 1st in
A guide groove branching into a branch groove and a second branch groove is formed, and first and second guide pins are formed at the lower part of the tape guide block to move along the guide groove, and the guide rail and the tape guide The block has a cam pin formed on one side and a cam groove that can be engaged with the cam pin on the other side, and the tape guide block is formed by the cooperation of the cam pin and the cam groove immediately before the loading is completed. The tape loading device is characterized in that the second guide pin rotates significantly so as to be guided by the second branch groove. 2. The cam groove is formed continuously from the open end and parallel to a line connecting the first and second guide pins, and the cam groove is formed in parallel with the line connecting the first and second guide pins, and a straight line portion for moving the guide pin to the first branch groove; and a straight line portion that slides continuously from the straight line portion while coming into contact with the second guide pin when the second guide pin approaches the branch portion to move the second guide pin. The tape loading device according to claim 1, further comprising a curved portion that is moved to the second branch groove.