JPH0422423Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to magnetic recording and reproducing devices, and more particularly to improvements in a mechanism for loading magnetic tape from a cassette into a cylinder having a rotating head.

[Prior Art] Conventionally, tape loading mechanisms of magnetic recording and reproducing devices such as video tape recorders include an arm type,
A groove guide link method, a groove guide disk method, etc. have been devised. However, these conventional systems have a large number of parts, are complex, and move large parts, so the loading mechanism occupies a large proportion of the machine. In addition, an escape mechanism is absolutely necessary to eliminate errors in the stopping position of the loading leader, but using a cam or a clutch increases the number of parts, complicates the mechanism, and increases the size. There are disadvantages such as inviting

[Purpose of invention]

An object of the present invention is to reduce the ratio of the tape loading mechanism to the entire device.

Another object of the present invention is to simplify the structure of the tape loading mechanism by reducing the number of parts.

Still another object of the present invention is to provide a tape loading mechanism suitable for miniaturization.

[Structure of the idea]

In order to achieve the above objects and eliminate the drawbacks of the prior art, the present invention includes a loading leader for pulling out a magnetic tape from a cassette and winding it onto a predetermined position on a rotating cylinder, and a loading leader provided between the cassette and the cylinder. , a rotating shaft having a spiral groove on its surface, a moving member that moves in the longitudinal direction on the shaft as the shaft rotates, a lever that connects the loading leader to the moving path, and movement of the loading leader. The gist of the present invention is that a tape loading mechanism is constructed from a groove that regulates a path and a drive source that rotates the shaft.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

In Figure 1, loading leaders 3 and 4
The tape 9 is pulled out from inside the cassette 7 and moved to a position near the drum 2, which is positioned by the V-blocks 10 and 11. At this time, the loading leaders 3 and 4 are moved to the chassis (). It is configured to move according to grooves 5 and 6 on 1.

To describe the above-mentioned configuration in more detail, in FIG. 2, the motor 36 includes a pulley 35, a belt 34,
A shaft 28 is rotated via a pulley 33, and a worm gear 30 and a worm gear 29 are press-fitted into the shaft 28, and rotate together with the shaft.

Note that since the loading leader 3 and the loading leader 4 have the same configuration and operation, the configuration and operation of the loading leader 3 side will be explained. The worm wheel 26 meshes with the worm gear 30. The worm wheel 26 is press-fitted into the shaft 12 having a spiral groove. Further, as shown in FIG. 4, a moving member 16 is incorporated into the shaft 12 so as to be slidable in the longitudinal direction of the shaft.

A pin 40 is press-fitted into the moving member 16,
It fits into the spiral groove of the shaft 12. Therefore, when the shaft 12 rotates, the moving member 16
If the rotation of the shaft is restricted, the moving member 16 will move in the B direction relative to the shaft 12 when the shaft rotates in the C direction, and move in the A direction when the shaft rotates in the D direction.

Furthermore, as shown in FIG. 3, a pin 38 is press-fitted into the loading leader 3, and the arm 14 is rotatably supported on this pin.
A pin 39 is also press-fitted into the movable member 16, and the arm 14 is rotatably supported on this pin as well. Therefore, as the moving member 16 moves, the loading leader 3 moves along the groove 5.

With the above-described structure, the loading leader 3 is moved from inside the cassette to the vicinity of the drum in the following manner. FIG. 5a shows the state while the loading leader 3 is in the intermediate position. Now, when the moving member 16 is about to move in the Y direction, a force in the H direction is generated on the shaft due to friction loss between the loading leader 3 and the groove 5, but the compression spring 22 The position of the shaft 12 does not change in order to generate a large force. Similarly, when moving in the Z direction, the compression spring 20 does not change the position of the shaft 12.

FIG. 5b shows a case where the loading leader 3 has reached a fixed position near the drum, and the loading leader 3 cannot move in the G direction, and the moving member 16 also cannot move. In this state, if the shaft 12 is further rotated in the direction in which the moving member 16 moves in the G direction, the shaft 12 will move from FIG. 5a to FIG. 5b.
Move to the right, as in the state of . As a result, the compression spring 22 will be compressed. As a result, the force generated by the compression spring 22 becomes a pressing force necessary for the loading leader 3 to be pressed against the V-block 10 and positioned.

FIG. 5c shows a state in which the loading leader 3 has returned to the inside of the cassette and cannot be moved in the H direction, and the moving member 16 is also unable to move.
When the shaft 12 is further rotated in the direction in which the moving member 16 moves in the H direction, the compression spring 20 is compressed and the shaft 12 is moved to the left. In other words, this operation can absorb errors in the return position of the loading leader 3 within the cassette.

Further, in FIG. 5, the driving source can be moved even after the V-block of the loading leader is crimped or after it has returned completely into the cassette, which is convenient for performing other operations.

[Effect of idea]

As mentioned above, according to the present invention, only the loading leader, lever, and moving members are moved, so the volume occupied by the device is small, and it can be implemented with a simple mechanism with a small number of parts, which is extremely effective for downsizing the machine. It's advantageous.

[Brief explanation of drawings]

1 and 2 are schematic configuration diagrams of one embodiment of the present invention, FIG. 3 is a diagram showing the relationship between the moving member and the loading leader in this embodiment, and FIG. 4 is a diagram showing the shaft and loading leader in the above embodiment. Detailed drawings of moving parts,
FIGS. 5a, 5b and 5c are explanatory diagrams of the operation of the above embodiment, respectively. 1... Chassis, 2... Cylinder, 3, 4...
Loading leader, 5, 6... groove, 7... cassette, 8... reel, 9... tape, 10, 1
1...V block, 12, 13...Shaft, 1
4, 15... Arm, 16, 17... Moving member,
18, 19...Bearing, 20-23...Compression spring,
24, 25... Bearing, 26, 27... Worm wheel, 28... Shaft, 29, 30... Worm gear, 31, 32... Bearing, 33, 35...
Pulley, 34...belt, 36...motor,
37...Main chassis, 38, 39...Pin.

Claims (1)

[Claims for Utility Model Registration] A magnetic recording and reproducing device that draws out a magnetic tape from a cassette equipped with the magnetic tape and winds it around a cylinder equipped with a rotating magnetic head to record and reproduce signals on the magnetic tape. A loading leader for pulling the tape out of the cassette and wrapping it around the cylinder at a prescribed position; a rotating shaft having a spiral groove on its surface and provided between the cassette and the cylinder; and a rotating shaft having a spiral groove on its surface. a moving member that is engaged with the shaft and moves in the longitudinal direction on the shaft as the shaft rotates; a lever that rotatably connects the loading leader and the moving member; and a lever that regulates the moving path of the loading leader. A groove, a drive source for rotating the shaft, a bearing for movably supporting the shaft in an axial direction, and a compression spring provided between an end of the shaft and the bearing. Features a tape loading mechanism for magnetic recording and reproducing devices.