JPH1125544A - Tape recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simply constituted tape recorder which is capable of changing over the tape running direction without mechanical operation and easily operating the changeover of the running mode. SOLUTION: Intermediate gears 7, 8 always engaging with a capstan gear 2 are freely rotatably mounted a changeover lever 4 capable of sliding and turning, and the turning of the changeover lever 4 allows the engagement or unengagement of these intermediate gears with reel gears 13, 16. On the other hand, an FR gear 9 is provided, which is movable to the positions engaging or unengaging with the capstan gear 2 and hub driving gears 12, 15. At the time of sound recording/reproducing operation, either one of the intermediate gears is made to engage with the reel gear in accordance with the rotating direction of the capstan gear 2, and at the fast forwarding time, the FR gear 9 is made to engage with either one of the hub driving gears by operating an FR plate 20, and also both of the intermediate gears come to the unengaged state with the reel gears, then the tape running is executed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape recorder,
More specifically, the present invention relates to a structure of a magnetic tape traveling drive system of a tape recorder.

[0002]

2. Description of the Related Art In a conventional magnetic tape traveling mechanism of an automatic reverse type tape recorder, when switching between forward and reverse traveling directions, a forward and a reverse side reel driving of a reel shaft drive gear system is used. By switching the meshing state of the gear system, the forward or reverse side tape hub driving reel shaft is driven, and the magnetic tape can be run in the forward or reverse direction.

[0003] A recording / playback mode, for example, FF
-In switching to the fast-forward mode such as REW, in addition to the switching operation of the forward and reverse running directions, the state in which the tape hub driving reel gear integrated with the tape hub driving reel shaft is driven, The meshing state of the gears is switched between a state in which the rotating reel gears connected to the reel shaft are driven.

[0004]

However, in the above-mentioned conventional tape recorder, when switching the tape running direction and switching between the recording / playback mode and the fast-forward mode, the meshing of a plurality of intermediate gears is required. Since the state is switched, a complicated switching operation mechanism is required, and it is difficult to reduce the size of the apparatus. Further, in the so-called review operation, it is necessary to simultaneously switch the tape running direction and switch to the fast-forward mode, so that the operation is particularly complicated.

[0005] The present invention has been made to solve the above-mentioned problems, and the switching of the tape running direction is performed by:
For example, the operation can be performed without mechanical operation by reversing the rotation direction of the motor and the capstan gear just by operating the electric switch, and the configuration is simple even when a switching mechanism to the fast-forward mode is provided. It is an object of the present invention to provide a tape recorder which can be reduced in size and cost.

[0006]

A first tape recorder according to the present invention comprises a capstan gear rotatable integrally with a capstan shaft, a pair of rotating reel gears, and a pair of rotating gears which are always meshed with the capstan gear. Rotatably supports the intermediate gear, and is rotatable around the rotation center of the capstan gear, and is also movable in a direction substantially perpendicular to a line connecting the rotation centers of the pair of rotation reel gears. A swinging member, and in the first mode, moving the swinging member so as to approach the line segment so that one of the pair of intermediate gears rotates according to a rotation direction of the capstan gear. In the second mode, the swing member is moved away from the line segment, and both of the pair of intermediate gears are engaged with the pair of rotary reel gears. Re and and a control member for controlling so as not mesh well. In the tape recorder, in the first mode, the swing member is moved so that any one of the pair of intermediate gears meshes with any one of the pair of rotating reel gears, and in the second mode, The swing member is moved in the opposite direction, and control is performed such that none of the pair of intermediate gears mesh with any of the pair of rotary reel gears.

The second tape recorder of the present invention is the above-mentioned first tape recorder, further comprising a first tape hub driving gear connected to one of the pair of rotary reel gears via a slip mechanism; A second tape hub driving gear coupled to the other of the pair of rotating reel gears via a slip mechanism, and selectively meshing with the first tape hub driving gear or the second tape hub driving gear; And an intermediate gear for high-speed driving. In the above-mentioned tape recorder, the high-speed driving intermediate gear meshes with the capstan gear in the second mode by the control member, and any one of the first tape hub driving gear and the second tape hub driving gear. The intermediate gear for high-speed driving is moved to a meshing position.

In a third tape recorder according to the present invention, in the first or second tape recorder, the capstan gear and the pair of intermediate gears do not clog in rotation in the second mode. In addition, the tooth width is smaller than the standard tooth profile of a commonly used gear, and the diameter of the root circle is smaller.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are plan views showing an operation state of a magnetic tape traveling drive system in a tape recorder according to an embodiment of the present invention. FIG. 1 is for recording / reproduction in a forward direction, and FIG. The state at the time of tape fast forward in the forward direction is shown. FIG. 3 is a cross-sectional view of FIG.
FIG. 4 is a cross-sectional view taken along the line BB 'of FIG. FIG. 5 is an exploded perspective view around the capstan axis of the traveling drive system.

The magnetic tape traveling drive system of the tape recorder according to the present embodiment mainly includes a capstan section, a reel section,
An intermediate gear unit, a high-speed driving intermediate gear unit, and an operation unit are provided. However, although not shown in FIG. 1 and the like, the tape recorder includes a drive motor, a magnetic recording / reproducing head, a pinch roller, a traveling direction switching switch, a recording / reproduction switching switch, and other operation members in addition to the traveling drive system. Shall be provided.

The capstan section is a member driven by a drive motor as a belt as shown in FIG. 1 and the like, and includes a pulley 1 also serving as a flywheel, and a capstan gear 2.
And the capstan shaft 3 are configured as an integrated member. The capstan shaft 3 includes a main body 51.
Is rotatably supported by the shaft support portion 51a.

The reel section is rotatably supported by support shafts 52 and 53 fixed to the main body 51, and has a tape hub drive shafts 11 and 14 at its distal end and a pair provided integrally with the drive shafts. Certain first and second tape hub driving gears (hereinafter, referred to as hub driving gears) 12, 15 and rotatably supported by the support shafts 52, 53, and a slip mechanism above the hub driving gears 12, 15. A pair of first and second rotary reel gears 13,
16.

The first gears are for traveling in the forward direction, and the second gears are for reverse traveling. Further, the first and second rotary reel gears 13, 16
A line connecting the center of the axis is defined as a line segment L0.

The intermediate gear portion includes a switching lever 4 serving as a swing member for supporting the intermediate gear, and a pair of first and second intermediate gears 7 and 8 rotatably supported by support shafts 5 and 6.
And an urging spring 34 for urging the switching lever 4 toward the reel portion.

The switching lever 4 has, at its center, an elongated hole 4a which is slidably and rotatably fitted into the shaft support portion 51a, and cam portions 20d, 20e of the FR plate 20, which will be described later.
It has a projection 4b fitted into the recess 20c, and stoppers 4e, 4f fitted at both ends thereof in a state of being movable in the lever sliding direction with respect to the main body recess 51b. The first and second intermediate gears 7 and 8 are rotatably supported on the switching lever 4 by support pins 5 and 6 at positions parallel to the line L0. 2
Is engaged.

The sliding direction of the switching lever 4 is a direction orthogonal to the line L0 of the reel section.
With the right and left movement operation of the R plate 20, the cam portions 20d, 2
When the protrusion 4b is pulled out by the contact hole 0e, the protrusion 4b slides in a direction away from the line segment L0, and as shown in FIG.
1b and the stoppers 4e and 4f abut against each other,
Intermediate gears 7, 8 are the first and second rotary reel gears 1
It is held in a non-meshed state separated from both 3 and 16.

When the FR plate 20 is returned to the neutral position, the projections 4b are released from the cam portions 20d and 20e,
When it is on the cam portion 20c, it moves in a direction approaching the line segment L0 by the urging force of the urging spring. In this state, as shown in FIG. 1, the main body concave portion 51b and the stopper 4e,
The switching lever 4 is rotatable by an amount corresponding to the play between the first intermediate gear 7 and the first rotary reel gear 13, or the second intermediate gear 8 and the second rotary reel, depending on the direction of rotation. One of the gears 16 meshes.

Since the switching lever 4 moves in the direction perpendicular to the line L0 as described above, the first and second intermediate gears 7, 8 supported by the lever, and the gear The center-to-center distance between the capstan gear 2 and the captive gear 2, which is always in mesh, is slightly changed. In the state where the distance between the centers changes, in the case of the gear adopting the standard tooth profile, a meshing state occurs, and smooth rotation cannot be obtained.

Therefore, in the present embodiment, the tooth profile of each of the first and second intermediate gears 7 and 8 and the capstan gear 2 is defined by the JIS standard or the like as shown in the tooth profile enlarged view of FIG. The tooth shapes 7a and 8a have a smaller tooth width B1 and a smaller root diameter db1 with respect to the tooth width B0 and the root diameter db0 of the standard gear 61. In FIG. 6, dp indicates the pitch circle diameter. By adopting the gear shape as described above, it is possible to prevent the meshing of the engagement as described above.

The high-speed driving intermediate gear portion is disposed at a substantially central position between the capstan gear 2 and the first and second hub driving gears 12 and 15, and is a single high-speed driving fixed to the shaft 10. It is composed of an FR gear 9 as an intermediate gear.

The shaft 10 is slidably fitted into a V-shaped cam groove 51d of a cam member 51c (see FIGS. 4 and 5) fixed to the main body 51 and a U groove 21b of an FR plate described later.
The V-shaped cam groove 51d is driven by the U-shaped groove 21b.
When the FR gear 9 is at the center position, the FR gear 9 is held in a non-meshing state separated from the capstan gear 2 and the first and second hub driving gears 12 and 15. When the shaft 10 is at both ends of the V-shaped cam groove 51d, the FR gear 9
Is the capstan gear 2 and the first hub drive gear 1
2, or meshes with the capstan gear 2 and the second hub drive gear 15, respectively.

The operation unit is a tape fast-forward direction switching operation control member, and includes an FR plate 20 having a drive pin 20b guided in the left-right direction by a main body guide pin 54 and capable of sliding operation; And a control lever 21 rotatably supported by a main body-side support shaft 63 having a U-groove 21a into which the shaft fits and a U-groove 21b into which the FR gear shaft 10 is slidably fitted.

The FR plate 20 can be moved to three operation positions. That is, it moves to a neutral position P20A, which is the recording / reproducing position in FIG. 1, a forward fast-forward position P20F (see FIG. 2) moved leftward from the neutral position by a switching operation, and a reverse fast-forward position P20R moved rightward. It is possible.

An operation lever 21 driven via a drive pin 20b in accordance with the operation of moving the FR plate 20.
Similarly, from the recording / reproducing position neutral position P21A to the forward fast forward position P21F or the reverse fast forward position P21.
Rotated to 21R. The rotation of the operation lever 21 moves the FR gear support shaft 10 along the V-shaped cam groove 51d.
The R gear 9 can be moved to a position where it does not mesh with each gear and a position where it meshes with any of the hub drive gears and the capstan gear 2.

Next, a description will be given of the operation of the tape recorder of the present embodiment configured as described above during traveling by the tape traveling drive system. In the first mode, ie, the mode for recording / reproducing, the FR plate 20 is positioned at the center position P20A as shown in FIG. In this state, the operation lever 2
1 is also at the neutral position P21A, and the FR gear 9 is not meshed with any of the capstan gear 2, the first hub drive gear 12, and the second hub drive gear 15. Therefore, the hub drive shafts 11 and 14 are not rotated at high speed. On the other hand, the support lever 4 is in the released state because the projection 4b is on the concave portion 20c of the cam portion of the FR plate 20, and moves in the direction approaching the line segment L0 (the direction approaching the reel portion side). I have.

At the time of recording / playback in the forward direction, the capstan gear 2 is rotated clockwise by the drive motor. The switching lever 4 in the above-described state is rotated clockwise in the same direction as the capstan gear 2 by the driving reaction force. Then, the stopper 4e contacts the reel-side end surface of the main body concave portion 51b, and the stopper 4f contacts the non-reel-side end surface of the main body concave portion 51b (see FIG. 1).

The switching lever 4 tilted as described above.
Then, as shown in FIG. 3, the first intermediate gear 7 meshes with the first rotating reel gear 13, and the second intermediate gear 8 retreats and is separated from the second rotating reel gear 16. . Accordingly, the first hub drive shaft 11 is rotated clockwise by the first rotating reel gear 13 via the slip mechanism 32, and the magnetic tape runs in the forward direction for recording or reproduction. Will be

On the other hand, during recording / playback in the reverse direction, the capstan gear 2 is rotated counterclockwise by the drive motor. The switching lever 4 in the state approaching the line segment L0 rotates counterclockwise in the same direction as the capstan gear 2 by the driving reaction force thereof, and the stopper 4f side faces the main body concave portion 51.
b abuts on the reel-side end surface, and the stopper 4e is
1b is in contact with the end surface on the side opposite to the reel.

In the switching lever 4 inclined as described above, the second intermediate gear 8 meshes with the second rotary reel gear 16, and the first intermediate gear 7 retreats to the first rotary reel gear 13. It is far away. Accordingly, the second hub drive shaft 14 is rotated counterclockwise by the second rotating reel gear 16 via the slip mechanism 33, and the magnetic tape runs in the reverse direction for recording or reproduction. Will be

As described above, the tape recorder of the present embodiment does not require any mechanical operation, and simply switches the rotation direction of the drive motor to change the rotation direction of the drive motor. The direction of movement of the tape during recording / playback can be switched by performing counterclockwise switching.

Next, when performing the fast forward in the forward direction in the fast forward mode as the second mode, the FR plate 20 is moved to the forward fast forward position P20F on the left as shown in FIG. Along with this movement, the switching lever 4 has its projection 4b pressed by the cam portion 20d of the FR plate 20, and moves away from the line segment L0 (the direction opposite to the reel portion).
And the stoppers 4e and 4f are both in contact with the end face of the main body recess 51b on the side opposite to the reel. In this state, both the intermediate gears 7 and 8 are held in a non-meshing state separated from the rotary reel gears 13 and 16.

Further, as the FR plate 20 moves to the forward fast-forward position P20F, the operation lever 21 rotates clockwise. At this time, the shaft 10 is V
It moves along the cam groove 51d, and as shown in FIG.
The gear 9 meshes with the first hub drive gear 12 and the capstan gear 2. When the capstan gear 2 is rotated clockwise by the drive motor in this meshing state, the first hub drive shaft 11 is directly driven clockwise at a high speed directly without passing through the slip mechanism, and the magnetic tape is moved at a high speed in the forward direction. Let it run.

Next, when fast-forwarding in the reverse direction,
The FR plate 20 is moved to the right reverse fast-forward position P20R. Along with this movement, the switching lever 4 has its projection 4b moved to the cam portion 20e of the FR plate 20 in the same manner as described above.
, And moves in a direction away from the line segment L0 (in a direction opposite to the reel portion). In this state, both the intermediate gears 7 and 8 are held in a non-meshing state separated from the rotary reel gears 13 and 16.

Further, as the FR plate 20 moves to the reverse fast-forward position P20R, the operation lever 21 rotates counterclockwise. At this time, the shaft 10 moves along the V-shaped cam groove 51d by the U groove 21b, and the FR gear 9 meshes with the second hub drive gear 15 and the capstan gear 2.
When the capstan gear 2 is rotated counterclockwise by the drive motor in this meshing state, the second hub drive shaft 14 is driven at high speed directly in the counterclockwise direction without going through the slip mechanism, and the magnetic tape is moved in the reverse direction. Drive at high speed.

At the time of cue review, the magnetic head (not shown) is set at the reproduction position in the forward or reverse fast-forward state and the tape is run in the fast-forward direction. As described above, the first or second hub drive shafts 11, 14 are directly driven without the intervention of the slip mechanism, so that a high torque can be obtained.

In the traveling drive system of the above embodiment, the support shaft 10 of the FR gear 9 has a cam member 51c.
Is guided by the V-shaped cam groove 51d.
The hub drive gear and the capstan gear move to a meshing and non-meshing position. Therefore, the above FR
As a modified example of the gear guide support mechanism, a structure in which the support shaft 62 of the FR gear 9 is directly fixed to the operation lever 21 as shown in a cross-sectional view of the meshed state of the gears in FIG. .

In this modification, the rotation of the operation lever 21 directly moves the FR gear 9 selectively between the meshing position and the non-meshing position with respect to the first or second hub driving gears 12 and 15. And fast-forwarding can be performed. However, the FR gear 9 is always meshed with the capstan gear 2, and during recording / reproduction, the FR gear 9 rotates with no load.

As described above, according to the tape recorder of the present embodiment, the switching of the tape running direction at the time of recording / reproducing can be performed only by switching the rotating direction of the drive motor, thereby simplifying the operation.

Further, the switching of the traveling direction at the time of rapid traverse can be performed only by the switching operation of the single FR gear 9,
The mechanism becomes simple. Further, since the torque transmission path is simple, high torque driving in the cue / review operation is possible. Further, switching between the traveling drive system in the recording / playback state and the fast-forward state can be performed only by operating the FR board 20.

The tape running drive system of the tape recorder of the present embodiment is a symmetrical gear drive system. As described above, the structure of the gear switching mechanism is simple, the performance is stable, and the number of parts is reduced. Reduction and miniaturization are possible. Further, since the mechanism is simplified, the amount of force required for switching is reduced, the output of the drive motor can be set small, a smaller motor can be applied, and a thin drive belt can be used. Further, it is effective for power saving.

[0041]

As described above, according to the tape recorder of the first aspect of the present invention, the swing member is moved between the first mode and the second mode by operating the control member. Since the intermediate gear supported by the swinging member is configured to be positioned at a position where it can mesh with the rotary reel gear and a position where it does not mesh with the rotary reel gear, it is possible to switch between the rotary drive state and the non-drive state of the rotary reel gear. It can be configured with a simple mechanism.

According to the tape recorder of the second aspect of the present invention, in addition to the effect of the tape recorder of the first aspect, the high speed driving intermediate gear is further moved by the control member in the second mode. Since the high-speed driving intermediate gear meshes with the capstan gear and meshes with one of the first tape hub driving gear and the second tape hub driving gear, the tape hub driving gear can be formed with a simple configuration. It can be selectively driven.

According to the tape recorder of the third aspect of the present invention, in addition to the effects of the tape recorder of the first or second aspect, the tooth width of the tooth profile of the capstan gear and the intermediate gear is reduced, and the bottom of the tooth is reduced. When the diameter is reduced and the second mode is set, clogging of the capstan gear and the intermediate gear can be prevented, and smooth rotation can be obtained.

[Brief description of the drawings]

FIG. 1 is a plan view of a tape traveling drive system of a tape recorder according to an embodiment of the present invention in a recording / reproducing state.

FIG. 2 is a plan view of the tape traveling drive system in the tape recorder of FIG. 1 in a fast-forward state.

FIG. 3 is a sectional view taken along line AA ′ of FIG. 1;

FIG. 4 is a sectional view taken along line BB ′ of FIG. 2;

FIG. 5 is an exploded perspective view around a capstan gear of the tape recorder of FIG. 1;

6 is an intermediate gear applied to the tape recorder of FIG. 1,
FIG. 3 is an enlarged view showing a tooth profile of a capstan gear.

FIG. 7 is a sectional view showing a modification of the guide support mechanism for the FR gear in FIG. 4;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 2 ... Capstan gear 3 ... Capstan shaft 4 ... Switching lever (swing member) 7 ... First intermediate gear (intermediate gear) 8 ... Second intermediate gear (intermediate gear) 9 ... FR gear (high speed driving intermediate) 12) First hub driving gear (first tape hub driving gear) 13 ... first rotating reel gear (rotating reel gear) 15 ... second hub driving gear (second tape hub driving gear) 16 ... Second rotating reel gear (rotating reel gear) B1 ... tooth width db1 ... diameter of root circle L0 ... line segment connecting the rotation center of rotating reel gear

Claims (3)

[Claims] A capstan gear rotatable integrally with a capstan shaft, a pair of rotating reel gears, and a pair of intermediate gears always meshing with the capstan gear are rotatably supported, and the rotation of the capstan gear is performed. An oscillating member rotatable about the center and movable in a direction substantially perpendicular to a line segment connecting the rotation centers of the pair of rotary reel gears; In the second mode, the gear is moved so as to approach the line segment so that one of the pair of intermediate gears meshes with one of the pair of rotary reel gears according to the rotation direction of the capstan gear. A control member configured to control the moving member to move away from the line segment and to prevent any of the pair of intermediate gears from engaging with any of the pair of rotating reel gears. Tape recorder, wherein the door. 2. A first tape hub driving gear connected to one of the pair of rotary reel gears via a slip mechanism, and a second tape hub driving gear connected to the other of the pair of rotary reel gears via a slip mechanism. And a high-speed driving intermediate gear capable of selectively meshing with the first tape hub driving gear and the second tape hub driving gear. Further, in the second mode, the high-speed driving intermediate gear meshes with the capstan gear, and the high-speed driving intermediate gear engages with either the first tape hub driving gear or the second tape hub driving gear. The tape recorder according to claim 1, wherein the driving intermediate gear is moved. 3. The capstan gear and the pair of intermediate gears have a smaller tooth width and a lower root circle than a standard gear shape of a commonly used gear so as not to cause rotational jam in the second mode. 3. The tape recorder according to claim 1, wherein the diameter of the tape recorder is small.