JPS63291247A - Mechanism for adhering by pressing pinch roller of tape recorder - Google Patents

Abstract

PURPOSE:To smoothly perform a switching operation, by providing a driving device to drive a pinch roller to a waiting position and the driving device to drive it from the waiting position to an adhering position by pressing position on a capstan shaft separately. CONSTITUTION:When a recording or a reproducing operation is performed, a slider 12 starts to move, and the control pin 11d of a second gear 11 is abutted with the inclined plane 13a2 of a projection 13a, and furthermore, the second gear 11 is turned in a clockwise direction. Next, since a first gear 10 engaged with the second gear 11 is rotated in a counterclockwise direction, a sliding lever 7 is moved downward via a turning plate 9. Thereby, a sliding lever 6 is moved downward via the spring force of a spring 8, and a pinch arm 1 is rotated in the clockwise direction, and the pinch roller 1b is pressurized contact with the capstan shaft 14 in a state sandwiching a tape by the spring force of the spring 8. And when the slider 13 is moved further, the control pin 11d responds to a horizontal plane 13a3 which continues to hold the pressurizing contact state of the pinch roller 1b with the capstan shaft 14. In such a way, a driving force optimum for respective operation can be obtained.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention is applied to a tape recorder, particularly a digital audio recorder or a video tape recorder, in which a pinch roller is attached to the capstan shaft in order to press the pulled-out tape against the capstan shaft and send it out. This invention relates to an improvement of a pinch roller crimping mechanism for moving toward an axis.

[Conventional technology]

Like a digital audio recorder or video tape recorder (with the tape pulled out from the cassette half and wound around a rotating drum with a magnetic head,
In a tape recorder that runs a tape, the pinch roller must be located inside the tape in the cassette half before pulling out the tape, and
During the process of pulling out the tape, the amount of movement must be increased in order to pull out a considerable amount of the tape, similar to the tape pull-out member.Furthermore, during playback, recording, or video recording after the tape is pulled out, the capstan shaft must be moved from the standby state. It was necessary to apply pressure to the tape with the tape sandwiched between the two. In other words, the pinch roller performs two operations: pulling out the tape and pressing the tape onto the capstan shaft.

[Problem that the invention seeks to solve]

By the way, conventionally, the first drive device that performs the first operation and the second drive device that performs the second operation were performed by rotating one gear or moving a slide plate. However, the amount of rotation of the gear or the amount of movement of the slide plate is considerably large, and therefore the force for rotation or movement is also large, resulting in a large drive device.

In addition, the force that moves the pinch roller to the standby position and the force that presses the pinch roller in the standby position against the capstan shaft must be large, but the balance of these forces must be balanced by a single drive device. Another problem was that it was extremely difficult to implement.

[Purpose of the invention]

The present invention is intended to solve the above-mentioned problems, and involves using separate drive devices to drive the pinch roller to its standby position and from the standby position to its crimping position on the capstan shaft. This allows the force to reach the standby position and the force to reach the crimping position to be obtained separately.Also, by switching from the standby position to the crimping position by gear coupling, the switching operation can be performed smoothly. The object is to provide a roller crimping mechanism.

[Summary of the invention]

The present invention aims to achieve the above-mentioned object, and its gist is that after the pinch roller is displaced to a standby position by a first drive means, the pinch roller is moved to a capstan shaft by a second drive means. This is a mechanism in which a member displaced by the first driving means and a member displaced by the second driving means are connected by a gear connection.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described with reference to the drawings. Reference numeral 1 denotes a pinch arm that is supported by a shaft 1a on a chassis (not shown), and has a pinch roller 1b supported at its tip. Reference numeral 2 denotes a drawer arm supported by a shaft 2a on the chassis, and a fan-shaped gear 2b is formed on the drawer arm. Reference numeral 3 designates a connecting arm that is pivotally supported by a shaft 3a on the projecting piece 2c of the drawer arm 2, and has an elongated hole 3b formed at its tip end, and a connecting arm 3 formed in the elongated hole 3b on the lower surface of the pinch arm 1. A pin IC is inserted.

4 is a gear meshed with the fan-shaped gear 2b of the drawer arm 2, and 5 is a drive gear meshed with the gear 4, which is connected to a drive source such as a motor (not shown). Note that this drive source is driven when the tape cassette is loaded into the mechanical section and the operation of pulling out the tape from the tape cassette is started.

6.7 is a guide pin 5a implanted in the chassis.

Two sliding levers are slidably supported with guide holes 6b and 7b guided by guide holes 7a, and a spring 8 is stretched between them. The base end of the pinch arm 1 described above is connected to the tip of the sliding lever 6 by a pin 1d and a hole 6C.

Reference numeral 9 denotes a rotary plate supported by a shaft 9a on the chassis, and a long hole 9 is inserted into the pin 7C implanted in the sliding lever 7 described above.
b has been inserted. A first gear 10 is integrally attached to the rotary plate 9, and has several teeth 10a. A second gear 11 is supported by a shaft 11a on the chassis, and similarly to the first gear 10, several teeth 11b are formed.

Reference numeral 12 denotes a coiled spring wound around the rotational fulcrum of the first gear 10, and one end of which is a protrusion 12 formed on the chassis.
a, and the other end is engaged with a protrusion 11c formed on the second gear 11 described above. The return spring force of the coiled spring 12 applies a counterclockwise rotational force to the second gear 11. Note that the second gear 11
is formed so as not to rotate counterclockwise from the horizontal state shown in FIG.

Reference numeral 13 indicates a control pin li formed on the lower surface of the second gear 11, which is a slider that starts moving in the right direction by a drive source such as a motor that is driven when a recording or playback operation is performed.
A protrusion 13a is formed that abuts on the protrusion 13a and rotates the second gear 11 clockwise against the spring force of the coil spring 12. The protrusion 13a includes a vertical portion 13a engaged with the control pin lid, an inclined surface 13a2 inclined upward from the vertical surface 13a, and a horizontal surface 13a3 extending horizontally from the inclined surface 13at. There is.

Note that 14 is a capstan shaft.

Next, to explain the operation based on the above configuration, when a tape cassette (not shown) is loaded in the state shown in FIG. 1, a drive source such as a motor is driven and the drive gear 5
, gear 4, and fan-shaped gear 2b, the drawer arm 2 is rotated clockwise. When the drawer arm 2 is rotated, the pinch arm 1 is rotated clockwise via the connecting arm 3 and brought close to the capstan shaft 14. Furthermore, when the pinch arm 1 is rotated clockwise, the sliding lever 6 connected to the pinch arm 1 moves downward, and the sliding lever 7 also moves downward. Then, the rotating plate 9 is rotated counterclockwise by the sliding lever 7, and the first gear 1 is rotated accordingly.
0 is rotated in the same direction as the rotating plate 9, the tooth portion 10a of the first gear 10 and the tooth portion 11b of the second gear 11 are meshed with each other, and as the first gear 10 rotates, second gear 1
1 is slightly rotated clockwise against the spring force of the coiled spring 12. In this state, the control pin 1 of the second gear 11
1d corresponds to the inclined surface 13a2 of the slider 13.

The above state is the state shown in FIG. 2, and when a recording or playback operation is performed from this state, the slider 13 starts moving rightward by a drive source such as a motor (not shown).

Therefore, the control pin lid of the second gear 11 has the protrusion 13a.
The second gear 11 is further rotated clockwise. When the second gear 11 is further rotated, the first gear 10 meshing with the second gear 11 is rotated counterclockwise, so that the sliding lever 7 is rotated via the rotating plate 9. Move downward. As a result, the sliding lever 6 moves downward via the spring force of the spring 8,
Therefore, the pinch arm 1 is rotated clockwise, and the pinch roller 1b is pressed against the capstan shaft 14 with the tape sandwiched therebetween by the spring force of the spring 8, as shown in FIG. In this state, when the slider 13 moves further, the control pin lid corresponds to the horizontal surface 13a, and the pinch roller 1b continues to be in pressure contact with the capstan shaft 14.

Furthermore, when the recording or playback state is changed to the stop state, the slider 13 returns to the left, so the control pin lid
is removed from the inclined surface 13az of the protrusion 13a, and the second gear 11 returns to the state shown in FIG. 2 by the spring force of the coiled spring 12.

Also, when the tape cassette is ejected, the second
Since the drive gear 5 rotates in the opposite direction to the rotational direction from the state shown in the figure, the pull-out arm 2 is rotated clockwise, and therefore the pinch arm 1 is rotated counterclockwise via the connecting arm 3. As a result, the sliding lever 6.7 is pulled upward and the rotating plate 9 is rotated clockwise.
Tooth portions 10a and llb of the first gear 10 and the second gear 11
At the same time, the second gear 11 is rotated counterclockwise by the spring force of the coil spring 12, and the second gear 11 is disengaged from the first gear.
This returns to the state shown in the figure.

〔Effect of the invention〕

As described above, in the present invention, the drive device for driving the pinch roller to the standby position and the drive device for driving from the standby position to the crimping position to the capstan shaft are performed by separate drive devices. The force to the crimping position and the force to the crimping position can be obtained separately. Therefore, it is easy to obtain the optimum driving force for each operation, resulting in smooth operation, and also from the standby position to the crimping position. Since the switching is performed by gear coupling, it is possible to reliably press the pinch roller to the capstan shaft, which requires a large driving force, without slipping or the like.

[Brief explanation of the drawing]

The figures show an embodiment of the pinch roller crimping mechanism of a tape recorder according to the present invention, FIG. 1 is a plan view showing an initial state, FIG. 2 is a plan view showing a state shifted to a standby state, and FIG. FIG. 2 is a plan view showing a recording or playback state. ■...Pinch arm, 1b...Pinch roller, 2.
...Drawer arm, 3...Connection arm, 6,7...
Sliding lever, lO...first gear, 11...second gear, 12...coiled spring, 13...slider. Patent applicant Pioneer Corporation α′ C Figure 1

Claims (1)

[Claims] a pinch arm that displaces the pinch roller to a standby position by a drive means driven in response to an operation of pulling out a tape in a tape cassette; a first gear that displaces in response to the displacement of the pinch arm; a second gear that is meshed with the first gear when the gear is in a standby position; and a second gear that is meshed with the first gear in response to recording or playback operation, and a second gear that is meshed with the first gear when the gear is in a standby position. 1. A pinch roller crimping mechanism for a tape recorder, comprising a second driving means rotated in a direction to press against a capstan shaft.