JP2625807B2 - Tape direction switching device for magnetic recording tape playback device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for switching a tape reproducing direction and a fast-forwarding direction in a magnetic recording tape reproducing apparatus.

2. Description of the Related Art Usually, a magnetic recording tape reproducing apparatus is provided with a device for switching a reproducing direction and a fast-forward direction of a tape. Such a magnetic tape reproducing apparatus is disclosed in, for example, JP-A-61-123040.
No. 6,086,045.

In the conventional magnetic recording tape reproducing apparatus, the switching between the reproducing direction and the fast-forwarding direction is performed by moving a gear, which is a drive transmitting means for reproduction or a drive transmitting means for fast-forward, by a driving force of a solenoid, and meshing the gears. The direction was switched by converting Further, the switching is used as a driving force to move the magnetic head forward or backward, or to move a pinch roller sandwiched for winding the tape forward or backward.

Problems to be Solved by the Invention In such a conventional magnetic recording tape reproducing apparatus, the gears are moved by the driving force of the solenoid, so that the meshing is shocking, and the apparatus is easily broken. Further, there is a problem that many solenoids and other parts are required.

The present invention has been made to improve the conventional magnetic recording tape reproducing apparatus described above, and can reduce the number of parts,
An object of the present invention is to provide a tape direction switching device of a magnetic recording tape reproducing device capable of extending the life of each component.

Means for Solving the Problems A description will be given of a tape direction switching device of a magnetic recording tape reproducing apparatus to which the present invention is applied to solve the above problems.

The tape direction switching device is provided with a stopper and a plurality of cam surfaces on a cam member driven by a motor. The tape playback direction switching member that engages with one of the cam surfaces is removably provided to the forward playback drive transmission means and the reverse playback drive transmission means and engages with the head chassis on which the magnetic head is mounted. doing.

According to the present invention, the cam member is driven by the motor,
The playback direction switching member engages with either the forward playback drive transmission means or the reverse playback drive transmission means following the cam surface, and the fast feed direction switching member follows the cam surface to forward forward drive transmission. And the head chassis is moved to cancel the transmission of the driving force of the forward reproduction drive transmission means or the reverse reproduction drive transmission.

Embodiments Hereinafter, embodiments of a tape of a magnetic recording tape reproducing apparatus provided with a tape direction switching device of the present invention will be described in detail. In the apparatus of this embodiment, the reproduction operation mode (A-side PLAY, B-side PLAY) and the fast-forward operation mode (A-side F
It has a loading operation mode (LOAD), an ejection operation mode (EJECT), a standby mode, and a switching mode. These basic modes are selected and combined to provide an apparatus having various functions.

The reproduction operation mode mentioned here is a mode in which the tape runs at a normal speed and the magnetic head picks up a signal. A-side playback operation mode (A-side
PLAY) and a B-side reproduction operation mode (B-side PLAY). The fast-feeding operation mode is a mode in which the tape is wound at a higher speed than usual and the magnetic head slightly retreats. A mode in which a signal is slightly picked up. FF) and a B-plane speed feed operation mode (B-plane FF). The rewind operation mode (REW) refers to the case where the operation is the same as the fast-forward operation mode, but the running direction of the tape is reversed. That is, the A-side rewinding operation mode (A-side REW) is the B-side high-speed operation mode (B-side F
F), the B-side rewinding operation mode (B-side REW) is nothing but the A-side high-speed feeding operation mode (A-side FF). The loading operation mode means that the tape pack is transported from the outside of the apparatus and is loaded at a fixed reproduction position, and the position of the tape winding mechanism and the magnetic head is advanced to the reproduction operation mode.
The discharging operation mode is an operation opposite to the loading operation mode.
That is, it means that the tape winding mechanism, the magnetic head, and the like are retreated from the reproducing operation mode to the standby mode, and the tape pack is transported from the fixed reproduction position to the outside of the apparatus. Standby mode means that the tape pack is not inserted or stopped (PA
USE), in which the tape is stopped running and the magnetic head is retracted. The switching mode is a switching between the above modes.

FIG. 1 is a perspective view of the entire deck section of an embodiment of a magnetic recording tape reproducing apparatus to which the present invention is applied, and shows a state before a tape pack 1 is loaded, that is, a standby mode. FIG. 2 is the same view, but is an overall view rotated 90 ° clockwise about the vertical axis (ZZ ') from the direction of FIG. FIG. 3 is an overall view showing the state in which the tape pack 1 is loaded and in the reproducing operation mode, as viewed from the same direction as FIG. 4 is an exploded view in the same direction as FIG. 2, FIG. 5 is an exploded view of a main part in the same direction as FIG. 1, FIG. 6, FIG. 7 is an exploded view of a main part in the same direction as FIG. 8 and 9 are exploded views of essential parts viewed from below by rotating 90 ° counterclockwise about the vertical axis of FIG. 1, FIG.
FIG. 11 is an exploded view of a main part in the same direction as FIG. X-
The X ', YY', and ZZ 'axes indicate the directions in the respective drawings. FIG. 12 is a block diagram schematically showing the entire circuit configuration.

In the apparatus of the embodiment shown in these drawings, each operation is performed by a loading motor M1, a reel driving motor M2, and a solenoid S.
And a sensor for detecting each operation. For convenience of explanation of the configuration, each part mainly driven by the loading motor M1, each part mainly driven by the reel driving motor M2, each part mainly driven by the solenoid S, each part of the sensor and its surroundings, and the whole circuit The description will be made sequentially in outline.

<< Structure of Each Part Driven Mainly by Loading Motor M1 >> As shown in FIGS. 1 and 2, a first guide plate 5, a second guide plate 6, and a reel shaft chassis 50 are attached to the main body chassis 2. The loading motor M1 is attached to the reel shaft chassis 50. The motor M 1 and the movable plate 16 engaged with the tape holder 3 and the carriage 4 are connected by drive transmission means 8. The carriage 4 is engaged with the first guide plate 5 and the second guide plate 6. For this reason, the tape holder 3 connected to the carriage 4 is provided with these guide means 4.5.
6 can be moved.

As shown in FIG. 5, the shape of the tape holder 3 is an inverted U-shape having a sufficient dimension with respect to the tape pack 1, and the vicinity of the entrance of the tape pack 1 is tapered. The tape holder 3 is supported by a link plate 18 by a shaft 17, and the claws 3 a and 3 b of the tape holder 3 are engaged with holes of the carriage 4. The axis 21 of the link plate 18 is the movable plate 16
Through the long hole 16a, and is engaged with the linear guide long hole 5a of the first guide plate 5. The shaft 20 of the carriage 4 is the shaft hole of the link plate 18.
The rotating plate 7 is rotatably supported by passing through the long hole 16 b of the movable plate 16 and the bent guide long hole 5 b of the first guide plate 5. That is, the tape holder 3 and the link plate 18 are sandwiched between the tape holder 3 and the link plate 18 so that the vertical portion 4a of the carriage 4 is sandwiched between the tape holder 3 and the link plate 18.
, The link plate 18 and the carriage 4 can be rotated. The shaft 24 of the movable plate 16 is a bent guide slot of the first guide plate 5.
5b, and the shaft 25 is also engaged with the linear guide slot 5a. The shaft 22 of the carriage 4 is engaged with the guide slot 5a, and rotatably supports the rotary plate 7 outside thereof. Further axis
22 includes a spring 27 between the movable plate 16 and the link plate 18 described above.
The springs 28 are respectively extended between the shafts 21 and 21. The shaft 23 of the carriage 4 is engaged with the linear guide slot 6a of the second guide plate 6.

A spacer 148 is provided between the carriage 4 and the tape holder 3.
Are sandwiched between the carriage 4 and the carriage 4.
A rotation stopper 146 pivotally supported is provided. The rotation stopper 146 is urged clockwise by a spring 147,
6a is engaged with the notch 5c of the first guide plate 5, and the folded portion 146b protrudes to the position where the tape holder 3 sandwiches the cassette tape. A holding plate 144 is attached to the carriage 4 at a position corresponding to the opening 3c of the tape holder 3. Set plate 1
44 is made of a plate material having a spring property, and a plastic projection 145 is attached to the lower surface. The cassette tape 1 sandwiched between the tape holders 3 has a winding hole 102 (see FIG. 1).
Is suppressed by the protrusion 145, and it becomes absorbingly stable.

The drive transmission means 8 shown in FIG. 1 is a general term for a group of gears that converts the rotation of the loading motor M1 into linear motion and transmits the linear motion to the movable plate 16. These gear groups include a worm 10, a worm gear 11, a gear 29 coaxial with the worm gear 11, and a reduction gear train connected to the rotation shaft of the loading motor M1 shown in FIG. 6 and FIG.
12, a gear 13 and a rack 14 formed on a movable plate 16. In addition, a gear 31 coaxial with the gear 13 meshes with the cam gear 32 as a member driven by the rotation of the loading motor M1.

As shown in FIGS. 4 and 6, the head chassis 30 is provided with a magnetic head 40 for picking up signals from the tape. The head chassis 30 is slidable in the XX 'direction with respect to the main body chassis 2 by sliding pins 36, 37, and 38 implanted in the main body chassis 2 respectively in the guide holes 30a, 30b, and 30c. is there. The tip portion 30d of the head chassis 30 is in contact with a shaft 44 of a rotating lever 43 which is supported by the main body chassis 2 by a shaft 42. Further, a spring 41 is stretched between the head chassis 30 and the main body chassis 2 to be urged. Therefore, the rotating lever 43 is also constantly biased in the counterclockwise direction. The pin 45 attached to the lower side of the rotating lever 43 is in a positional relationship in which it contacts the upper cam surface 32a of the cam gear 32. When the tape pack 1 is not in the apparatus, the convex portion of the upper cam surface 32a is in contact with the pin 45. That is, in the state shown in FIG. 1, the head chassis 30 is prevented from moving in the X 'direction. However, when the loading motor M1 rotates and the concave portion of the upper cam surface 32a comes into contact with the pin 45, the head chassis 30
Advance in the X 'direction.

Note that a spacer is appropriately interposed between the head chassis 30 and the main body chassis 2 in order to arrange a mechanism for switching traveling, which will be described later.

<< Configuration of Each Part Driven Mainly by Reel Drive Motor M2 >> As shown in FIGS. 6 and 8, a reel drive motor M2 having a fixed rotation direction is mounted on the upper surface of the main body chassis 2. I have. The pulley 60 attached to the rotating shaft of the motor M2 passes through a hole in the main body chassis 2 and protrudes to the lower surface. Flywheels 62 and 63 are rotatably mounted on the lower surface of the main body chassis 2, and the belt 61 is connected to the pulley 60.
Between these flywheels 62 and
Reference numeral 63 indicates that the motor M2 always rotates in the opposite direction while the motor M2 is rotating. As shown in FIG. 9, an integral gear 62a is formed on the flywheel 62, and its shaft forms a capstan 62c. Gears 63a and 63b are formed integrally with the flywheel 63, and the shaft thereof constitutes a capstan 63c. Gear 63b is a reduction gear train
The gear 67 meshes with 65, 66, 67, and the switching cam gear 70
Of the outer peripheral gear missing portion 70c.

As shown in FIGS. 6 and 7, a reel shaft 87 and a reel shaft 88 are supported by a reel shaft chassis 50 mounted on the main body chassis 2 via shock absorbing springs 91 and 92, respectively. The reel shaft 87 is provided with a B-surface speed feed gear 77 and a B-surface reproduction gear 113, and the reel shaft 88 is mounted with an A-surface speed feed gear 78 and an A-surface reproduction gear 114 in tension with a torsion spring.

As shown in FIG. 10, a slide chassis 85 is slidably engaged with the upper surface of the main body chassis 2 in the YY ′ direction. A pin 86 is attached to the lower surface of the slide chassis 85 and penetrates a guide hole 2a opened in the main body chassis 2 to engage with the upper cam surface 70b of the switching cam gear 70. The cam surface 70b has a convex portion on one half of a circumference of 180 ° and a concave portion on one half.

Two idler gears 93 and 94 are supported on the chassis 2. That is, the shaft of the idler gear 93 is attached to the idler gear holding plate 95 through the escape hole 2b of the chassis 2. The idler gear holding plate 95 is supported by the chassis 2 so as to be rotatable by a shaft 105, and is urged inward (Y direction) by a spring 103 being suspended. Chassis 2
The rotation stopper 97 supported by the shaft is
It is in a positional relationship to be able to face and contact the projection 107 of 95 (see FIG. 6). The idler gear 94 is mounted in a symmetrical positional relationship with the idler gear 93. That is, the idler gear holding plate 9
6, relief hole 2c, shaft 106, spring 104, rotation stopper 98, protrusion 1
08 is symmetrical with respect to the corresponding portions with respect to the ZZ 'axis.

As shown in FIG. 4, elongated holes 97a and 98a are formed in the rotation stoppers 97 and 98, respectively, and engage with projections 109 and 110 attached to the lower surface of the head chassis 30, respectively. Therefore, when the head chassis 30 is retracted in the X direction (standby mode), the rotation stoppers 97 and 98 are pushed in the X direction, and the idler gears 93 and 94 are pushed.
Are both free. When the head chassis 30 has advanced in the X 'direction, the rotation stoppers 97 and 98 can also return to the X' direction. On the other hand, as shown in FIG. 11, the idler gear holding plates 95 and 96 have one ends facing the folded portions 85b and 85c of the slide chassis 85, respectively.

Pinch rollers 117 and 118 are rotatably supported on the chassis 2 via roller stands 123 and 124, respectively.
The roller stand 123 is urged counterclockwise by a torsion spring 119, and the roller stand 124 is
Is biased clockwise. Further, a pin 121 is attached to the roller stand 123, and a pin 122 is attached to the roller stand 124. The pins 121 are in a positional relationship of contacting the head chassis 30 and the slide chassis 85. Pin 12
2 is the same. When the head chassis 30 is retracted in the X direction (standby mode), the pins 121 and 122 are pushed by the pin chassis and the pinch rollers 117 and 118 are both retracted.

When the head chassis 30 advances in the X 'direction, the pins 121
And 122 are disengaged from the head chassis 30 and abut the slide chassis 85. At this time, when the cam gear 70 rotates and the slide chassis 85 moves leftward (in the Y direction shown by the arrow) according to the movement from the convex portion to the concave portion of the cam surface 70b,
Reference numeral 124 rotates clockwise, and the pinch roller 118 advances to contact the capstan 62c. At the same time, the roller base 123 is pushed back and rotated clockwise, and the pinch roller 117 retreats from the capstan 63c. The return 85c pushes the idler gear holding plate 96 by the movement of the slide chassis 85 in the Y direction, and rotates clockwise against the bias of the spring 104. Therefore, the idler gear 94 retreats in the Y direction and maintains a free state. On the other hand, the idler gear holding plate 95 is
The idler gear 93 is not restricted by the turning back 85b and is pulled by the spring 103, and the idler gear 93 advances in the Y direction. In this state, the idler gear 93 includes the flywheel gear 62a and the A-side reproduction gear 114.
Mesh with.

When the slide chassis 85 moves in the Y 'direction due to the rotation of the cam gear 70, the pinch roller 117 advances and comes into contact with the capstan 63c.
Step back from c. The idler gear 93 moves backward, and the idler gear 94 moves to the flywheel gear 63a and the B-side reproducing gear 1.
Engage with 13.

That is, when the slide chassis 85 as the playback direction switching member moves in the Y direction, the engagement between the idler gear holding plate 95 and the forward playback drive transmission means constituted by the idler gear 93 is released, and the idler 93 is moved to the flywheel gear.
The driving force is transmitted by meshing with the 62a and the A-side reproduction gear 114. Also, when the slide chassis 85 moves in the Y 'direction, the engagement between the idler gear holding plate 96 and the reverse direction drive transmission means constituted by the idler gear 94 is released, and the idler gear 94 is moved to the flywheel gear 63a and the B-side playback. The driving force is transmitted by meshing with the gear 113.

As shown in FIGS. 10 and 11, a cutout hole 85a is formed in the slide chassis 85, and the switching plate 80 passes through the cutout hole 85a and is held rotatably with respect to the chassis 2 by a shaft 81.
The slide chassis 85 and the switching plate 80 are connected by a shaft 82. On the other hand, a drive plate 130 for fast-feed switching is rotatably supported on the chassis 2. Pin 8 on switching plate 80
3 is attached and is engaged with the drive plate 130. The driving plate 130 has a chevron shape at the tip, and the inclined portions 130a and 130
has b. Further, a gear holding plate 74 is rotatably supported by a shaft 75 on the chassis 2. The gear holding plate 74 is bent and passes through the cutout hole of the chassis 2. A pin 76 is implanted on the upper surface side and engages with the long hole 80a of the switching plate 80. As shown in FIG. 9, coaxial switching gears 72 and 73 are pivotally supported on the lower surface side of the gear holding plate 74. Switching gear
Reference numeral 72 faces the flywheel gears 63a and 63b. The switching gear 73 faces the B-surface speed feed gear 77 and the A-surface speed feed gear 78.

When the cam gear 70 rotates to move the slide chassis 85 to the left (in the Y direction shown by the arrow) according to the movement of the cam surface 70b, the switching plate 80 is pushed by the shaft 82, and the switching plate 80 is rotated counterclockwise in FIG. Rotate. Here, when the driving plate 130 rotates counterclockwise by the action of the cam surface 70a and the driven member 132 described later, the inclined portion 130a hits the pin 83 and pushes, and the switching plate 80 further rotates. Therefore, the gear holding plate 74 rotates clockwise in FIG. 11 around the shaft 75 (counterclockwise in FIG. 9).
To rotate. When the gear holding plate 74 rotates counterclockwise from the position shown in FIG. 9, the gear 72 meshes with the gear 63a, and the gear 73 meshes with the B surface speed feed gear 77 (see FIGS. 6 and 7). When the slide chassis 85 moves rightward (in the direction indicated by the arrow Y '), the switching plate 80 rotates clockwise in FIG. Further, when the driving plate 130 rotates by the action of the cam surface 70a and the driven member 132, the inclined portion 130b hits the pin 83, and the switching plate 80 further rotates. The gear holding plate 74 rotates counterclockwise in FIG. When the gear holding plate 74 rotates clockwise from the position shown in FIG. 9, the gear 72 meshes with the gear 62a, and the gear 73 meshes with the A-plane speed feed gear 78.

That is, the driven member 132 serving as the fast-feed direction switching member
When the driving plate 130 rotates with the rotation, a pin fixed to the switching plate 80 according to the moving position of the slide chassis 85
The rotation direction of the switching plate 80 is determined by the contact of the 83 with the inclined portion 130a or the inclined portion 130b of the drive plate 130. The gear holding plate 74 rotates in accordance with the rotation direction of the switching plate 80, the gear 72 selectively meshes with the gear 62a or the gear 62b, and the gear 73 engages with the B-side fast-forward gear 77 or the A-side fast forward gear 78. The driving force is transmitted selectively. As described above, according to the moving position of the slide chassis 85, that is, the current tape reproducing direction, the inclined portions 130a and 130b of the driving plate 130, the switching plate 80, the gear holding plate 74, the gear 72, and the gear 73 move in the forward direction. It is configured as a high-speed drive transmission means or a reverse-direction high-speed drive transmission means.

<< Structure of Each Unit Driven Mainly by Solenoid S >> As shown in FIG. 11, a solenoid S is mounted on the upper surface of the main body chassis 2, and the plunger 136 has irregularities. A rotating lever 13 is provided on the lower surface of the main body chassis 2.
1 is rotatably supported by a shaft 137. Rotating lever
On the 131, a first projection claw 131a, a second projection claw 131b, and a third projection claw 131c are formed. The first protrusion claw 131a is loosely fitted in the opening of the main body chassis 2 and protrudes from the upper surface of the chassis, and is engaged with the plunger 136. A driven member 132 is rotatably supported by the chassis 2 and engages with a third protrusion 131c of the rotating lever 131 (see FIG. 9). Follower member 13
9 is urged counterclockwise in FIG. 9 by a spring 139.

As shown in FIGS. 8 and 11, the switching cam gear 70
The two gear missing portions 70c are opposed by 180 ° on the outer circumference, the cam surface 70b has a convex half on the upper side and a concave half on the upper side, and 180 ° on the lower side.
同一 The same cam surface 70a is formed opposite to each other, and the stopper projection 70d and the urging protrusion are further
70e is formed. The lower cam surface 70a has a missing portion 70f, and the pin 133 of the driven member 132 is located when the rotation of the cam gear 70 is stopped. A pin 134 attached to the driven member 132 is engaged with an opening of the drive plate 130 and the head chassis 30 for switching between fast feeds. The second protrusion 131b of the rotation lever 131 is engaged with the stopper protrusion 70d of the cam gear 70. A biasing bar 140 is pivotally supported by the chassis 2 and is biased by a spring 141. This urging bar 141 engages with the urging projection 70e of the cam gear 70,
The cam gear 70 is urged clockwise in FIG. As described above, the pin 86 of the slide chassis 85 is engaged with the cam surface 70b of the cam gear 70 (see FIG. 10), and the gear 67 is opposed to the gear missing portion 70c (see FIG. 9).

The solenoid S is controlled by a control circuit described later, and is sucked for a fixed time. Plunger by operation of solenoid S
When the 136 is sucked, the first projection 131a of the rotating lever 131 is pulled, and the rotating lever 131 is rotated.
Move away from the 0 stopper projection 70d. Therefore, the cam gear 70 is slightly rotated by the urging of the urging bar 140 and the spring 141. The cam gear 70 is rotated by the driving force of the motor M2 when the gear missing portion 70c rotates and the outer peripheral gear meshes with the gear 67. The gear missing portion 70c is provided at every 180 °. If the operation of the solenoid S is completed within 180 ° rotation, the rotating lever 131 is also in the biased state, so that the next gear missing portion 70c faces the gear 67. , Until the stopper projection 70d engages with the second projection 131b, that is, stops by rotating by 180 °. The rotation of the cam surface 70b causes the slide chassis 85 to move rightward (or leftward). When the rotation lever 131 rotates, the driven member 132 also rotates. If the suction time is short, the driven member 132 returns with the force of the spring 139 while the pin 133 of the driven member 132 does not engage with the cam surface 70a of the cam gear 70 and remains at the missing portion 70f. After the return, the pin 133 passes outside the cam surface 70a, so that the driven member 132 does not rotate. During the suction of the solenoid S, the driven member 132 rotates toward the center of the cam gear 70, so that if the suction time is long, the pin 133 engages with the rotating cam surface 70a. Therefore, the driven member 132 has the cam surface 70a.
, The pin 134 drives the head chassis 30 and the fast-feed switching drive plate 130. That is, the driven member 132
With the rotation of, the head chassis 30 is returned in the X direction.
When the driving plate 130 is driven, the switching plate 80 rotates as described above.

<< Configuration of Sensor and Its Peripheral Parts >> As shown in FIG. 4, a wiring board 53 is mounted on the second guide plate 6, and a switch SW1 is mounted on the wiring board 53. Further, an actuator 54 is pivotally supported on the tape pack insertion line of the second guide plate 6.
Axis 23 presses the actuator 54 to operate the switch SW1. Tape loading can be detected.

Similarly, a switch SW3 is mounted on the second guide plate 6. An operating end 85d is formed on the slide chassis 85, and the operating end 85d is engaged with a toggle lever of the switch SW3. Whether the slide chassis 85 is moving rightward or leftward can be detected. That is, it is possible to detect whether the vehicle is traveling on the surface A or traveling on the surface B.

Similarly, a switch SW5 is attached to the second guide plate 6, and an actuator is provided near the insertion port of the tape pack 1.
55 is supported and the tape pack 1 is
When the actuator 55 is inserted or pulled out, the actuator 55 rotates (operates the switch SW5. The tape insertion can be detected.

As shown in FIGS. 6 and 7, a wiring board 51 is mounted on the reel shaft chassis 50, and a switch SW2 is mounted on the wiring board 51. A bent portion 30e is formed in the head chassis 30 to operate the switch SW2. That the head chassis 30 has advanced in the X 'direction,
That is, tape reproduction can be detected by the switch SW2.

Similarly, a switch SW4 is attached to the wiring board 51. Actuator 4 for operating switch SW4
0 is supported by the reel shaft chassis 50 for the rotation function.
The actuator 4 is urged counterclockwise by a spring 52. On the other hand, on the lower surface of the cam gear 32, a lower cam surface 32b is provided.
(Shown by chain lines in FIG. 7). In the standby mode, the tip end portion 49a of the actuator 49 abuts on the convex portion of the lower cam surface 32b and is prevented from rotating. But the loading motor
When M1 rotates and the concave portion of the cam surface 32b comes into contact with the tip portion 49a, the actuator 49 can rotate. When the tape pack 1 is a metal tape, a metal tape detection hole 1a (see FIG. 1) is provided. Actuator
The protrusion 49b of the 49 is located at a position facing the metal tape detection hole 1a when the tape pack 1 is at the reproduction fixed position.
If the tape pack 1 is a metal tape, a loading motor
When M1 rotates, the actuator 49 rotates, and is detected by the switch SW4. That is, it is possible to detect whether or not the equalizer is necessary.

As shown in FIG. 8, a gear 77 of the reel shaft 87 and a reel shaft 88 are supported on the reel shaft chassis 50, and both the lower surface of the gear 77 of the reel shaft 87 and the lower surface of the gear 78 of the reel shaft 88 The reflection part Ref and the light absorption part Abs are separately painted. On the reel shaft chassis 50, a photoreflector PR1 is provided at a position facing the lower surface of the gear 77, and a photoreflector PR2 is provided at a position facing the lower surface of the gear 78. Therefore, the reel shaft 87, the output of the photoreflector PR1 and the photoreflector PR2,
The rotation of the reel shaft 88 can be detected. That is, the end of the tape can be detected.

<< Schematic Configuration of Entire Circuit >> FIG. 12 is a block diagram schematically showing the entire circuit. In the figure, 150 is a control circuit for controlling the operation of the entire apparatus, 151 is a drive circuit for supplying drive power to each part of the apparatus, 152 is a preamplifier for amplifying an audio signal from the magnetic head 40, 15
Reference numeral 3 denotes a mute circuit for cutting unnecessary signals, and reference numeral 154 denotes a circuit for detecting that there is no audio output. BS1 to BS5 are basic operations such as fast tape feed (FF) and tape rewind (RE
This is a board switch for selecting each operation of W), tape ejection / stop (EJECT / STOP), and tape running switching (PRO). The same basic operation, tape loading (LOAD)
Automatically starts when a tape pack is inserted, and playback (PL
AY) is controlled so as to automatically start after tape loading, tape running switching, tape end detection, etc., so that no separate switch is provided. BSC5 to BSC8 are switches for selecting an operation other than the above basic operations. In addition, the loading motor M1, the reel driving motor M2, and the solenoid S are the respective drive sources, the switches SW1, the switches SW2, the switches SW3, the switches SW4, the switches SW5, the photoreflectors PR1, and the photoreflectors PR2 have the functions described above. Each sensor has the following. The deck mechanism is a mechanical part described above.

A representative example of the operation of the magnetic recording tape reproducing device of the above embodiment will be described with reference to a flowchart and a time chart.

<< Tape Loading Operation >> FIG. 13 (a) is a flowchart, and FIG. 13 (b) is a time chart.

When the tape pack 1 is inserted into the tape holder 3 from the state shown in FIG. 1, the stopper 146 rotates and the engagement with the first guide plate 5 is released. When the tape holder 3 and the carriage 4 are further pushed by hand, the shaft 21 is extended while the spring 27 is extended, the shaft 21 is a linear portion of the guide elongated hole 16b of the guide elongated hole 5b, and the shaft 22 is The guide slot 5a and the shaft 23 slide along the guide slot 6a, respectively, and the shaft 23 rotates the actuator 54 to switch the switch SW1. This switching triggers the mute circuit 153 to operate, and the loading motor M1 rotates forward.
The rotation of motor M1 is worm 10 → worm gear 11 / gear 29
It is converted into a linear motion via a reduction gear train 12 → a gear 13 → a rack 14 and a movable plate 16. The movable plate 16 has a shaft 24 with a guide slot 5b.
Of the carriage 4 and the tape holder 3 since the shaft 25 slides in the guide slot 5a and advances, and the inclined portion of the guide slot 16b hits the shaft 20 of the carriage 4 that was ahead. Also proceed together. Because of being pulled by the springs 27 and 28, the shaft 20 advances to the falling position of the guide slot 5b, then falls along the falling, and the carriage 4 rotates about the shafts 22 and 23. The rotation plate 18 also rotates as the shaft 21 while being held down by the shaft 20, and receives the swing from the shaft 17 and the carriage 4.
The tape holder 3 is lowered by receiving the pressure. As a result, the shaft holes 101 and 102 of the tape pack 1 fit into the reel shafts 87 and 88, respectively, and the tape pack 1 comes to the reproduction fixed position shown in FIG.

On the other hand, the rotation of the loading motor M1 is rotated by the gear 31 coaxial with the gear 13.
To the cam gear 32. When the cam gear 32 of the motor M1 rotates, the pin 45 moves in the X 'direction according to the upper cam surface 32a. Therefore, the rotation lever 43 rotates, and the head chassis 30 advances in the X 'direction. This is detected by the switch SW2. In response to the signal from the switch SW2, the rotation of the loading motor M1 is stopped, the reel driving motor M2 is rotated, and the mute circuit 153 is instructed to output sound. Thus, the tape loading operation ends, and the reproducing operation starts.

<< Tape Ejection Operation >> FIG. 14 (a) is a flowchart, and FIG. 14 (b) is a time chart.

Board switch BS3 (EJECT / STOP) from the state of Fig. 3
By pressing, the mute circuit 153 operates. If the switch SW2 is on (reproducing state), then leave the switch SW2 off (fast-forwarding or rewinding state).
To stop. Next, the loading motor M1 is rotated in the reverse direction. The tape pack 1 is discharged after the mechanical operation reverse to the tape loading operation. The head chassis 30 moves backward in the X direction. When the switch SW1 is switched, the motor M2 is stopped, and the tape discharging operation ends.

<< Tape running switching operation >> FIG. 15 (a) is a flowchart, and FIG. 15 (b) is a time chart.

This is an operation to start reproduction after changing the tape running direction.
When the board switch BS4 (PRO) is pressed, the mute circuit 153 operates. The solenoid S is sucked for 100 mSec. The rotation lever 131 rotates, and the cam gear 70 rotates 180 ° with the stopper released. The rotation of the cam surface 70b causes the slide chassis 85 to move leftward (or rightward). As a result, the pinch rollers 118 (or 117) advance and the capstan 62c
(Or 63c) and pinch roller 117 (or 11
8) is retracted from the capstan 63c (or 62c), the idler gear 94 (or 93) is retracted, and the idler gear 93 (or 94) is moved to the flywheel gear 62a (or 63a) and the A-side regeneration gear 114 (or B-side regeneration). Meshes with the gear 113). At this time, since the suction time of the solenoid S is short, the rotating lever 131 is driven by the lower member
It returns before engaging with 70a. With this, the tape running switching is completed. Therefore, if a command is issued to output sound from the mute circuit 153, the reproducing operation starts.

<< Tape Fast Feeding Operation >> FIG. 16 (a) is a flowchart, and FIG. 16 (b) is a time chart.

For example, it is assumed that the board switch BS1 (FF) is pressed during A-side reproduction. First, the mute circuit 153 operates, and then the solenoid S is sucked for 250 mSec. The rotation lever 131 rotates, the cam gear 70 rotates, the slide chassis 85 moves rightward (in the direction of the arrow Y '), and the switching plate 80 rotates. Further, since the suction time of the solenoid S is long, the rotation lever 131 is held at the rotation position, and the driven member 132 is engaged with the lower cam surface 70a. The drive plate 130 rotates by the action of the driven member 132, and the switching plate 80 engaged with the drive plate 130 rotates. As a result, the gear holding plate
74 rotates, the gear 72 meshes with the gear 62a, and the gear 73
It meshes with the surface speed feed gear 78. On the other hand, as the driven member 132 rotates, the head chassis 30 slightly retreats. This starts the tape fast-feed operation.

<< Tape rewinding operation >> FIG. 17 (a) shows a flowchart, and FIG. 17 (b) shows a time chart. This flowchart is obtained by connecting the flowchart of FIG. 16A to the flowchart of FIG. That is, as can be seen from the flowchart, the board switch is used for the tape rewind operation.
When BS2 (REW) is pressed, the above-described tape running switching operation and the tape high-speed feeding operation are combined and sequentially executed. This starts tape rewinding.

In addition to each of these operations, detection of an audio signal during fast-forward (or rewind), switch SW3 (detection of A / B running), switch SW4 (metal tape detection), switch SW5 (tape insertion) Detection), photoreflectors PR1 and PR
Combining the functions of 2 (tape end detection), for example, automatic equalizer setting, fast-forward playback (CUE) operation, repeat playback (REPEAT) operation, automatic cue selection (TPS) operation, etc. are executed by commands from the control circuit. It is possible.

Effect of the Invention As described above, a magnetic recording tape reproducing apparatus provided with a tape direction switching device to which the present invention is applied operates different switching members on different cam surfaces by changing the operation time of a solenoid. is there. Since the switching member is not actuated by the driving force of the solenoid, the switching member does not hit other members by impact, so that a failure of the device can be prevented. Also, the number of parts can be greatly reduced.

[Brief description of the drawings]

1 and 2 are perspective views of the entire deck portion, which is a main part of an embodiment of a magnetic recording tape reproducing apparatus provided with a tape direction switching device to which the present invention is applied, and FIG. 4, FIG. 4 is an exploded view in the same direction as FIG. 2, FIG. 5 is an exploded view of a main part in the same direction as FIG. 1, FIG.
FIG. 7 is an exploded view of a main part in the same direction as FIG. 1, FIG.
FIG. 10 is an exploded view of a main part viewed from below, FIGS. 10 and 11 are exploded views of the main part in the same direction as FIG. 2, FIG. 12 is a schematic block diagram of the entire circuit configuration, and FIG. FIG. 14 (b) is a flowchart of the tape loading operation, FIG. 14 (b) is a time chart thereof, FIG. 14 (a) is a flowchart of the tape discharging operation, FIG. 14 (b) is a time chart thereof, and FIG. FIG. 16 (b) is a flowchart of the tape running switching operation, FIG. 16 (b) is a time chart thereof, FIG. 16 (a) is a flowchart of the tape high-speed feeding operation, and FIG.
FIG. 17 (a) is a flowchart of the tape rewinding operation,
FIG. 3B is a time chart thereof. M1 ... Motor for loading, M2 ... Motor for reel drive S ... Solenoid 1, ... Tape pack 2 ... Main body chassis 3, ... Tape holder 4 ... Carriage 5,6 ... Guide plate 7 ... Rotating plate, 8 Drive transmitting means 10 Worm, 11 Worm gear 12 Reduction gear train, 13, 29, 31 Gear 14 Rack 16 Movable plate 18 Link plate 30 ... Head chassis 32 ... Cam gear, 40 ... Magnetic head 43 ... Rotating lever, 50 ... Reel shaft chassis 60 ... Pulley, 62, 63 ... Fly wheels 62c, 63c ... Capstan, 70 ... … Cam gears 72, 73… Switch gears, 77, 78… High-speed feed gear 85 …… Slide chassis, 87, 88 …… Reel shafts 93, 94 …… Idler gears 95, 96 …… Gear holding plates 97, 98… Rotation stoppers 101, 102 Rewind holes 113, 114 Regeneration gear 117, 118 Pinch roller 130 Drive Plate, 131: Rotating lever 132: Follower member, 136: Plunger 144: Holding plate, 146: Rotating stopper BS1 to BS5: Operation selection switches SW1 to SW5: Switches PR1, PR2: Photo Reflector

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Shuichi Fukuda 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama, Kanagawa Prefecture Inside Matsushita Communication Industrial Co., Ltd. (72) Masakazu Kashikawa, Tsunashima-Higashi, Kohoku-ku, Yokohama, Kanagawa Prefecture 4-3-1 1-1 Matsushita Communication Industrial Co., Ltd. (72) Inventor Kaoru Watanabe 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture Matsushita Communication Industrial Co., Ltd. (72) Inventor Shogo Nakayama Yokohama-shi, Kanagawa Prefecture Matsushita Communication Industrial Co., Ltd. (72) Inventor Noboru Ishii 4-3-1 Tsunashima Higashi, Kohoku-ku, Yokohama-shi, Kanagawa Prefecture

Claims (1)

(57) [Claims] A cam member driven by a motor is provided with a plurality of cam surfaces, and a tape reproduction direction switching member engaged with one of the cam surfaces is provided to a forward reproduction drive transmission unit and a reverse reproduction drive transmission unit. The fast-forward direction switching member for the tape, which is detachably disposed and engages with another one of the cam surfaces, is detachably engageable with the forward fast-forward drive transmitting means and the backward fast-forward drive transmitting means. The reproducing direction switching member is engaged with one of the forward reproducing drive transmitting unit and the reverse reproducing drive transmitting unit by being engaged with the head chassis provided with the magnetic head and being driven by the cam member. When driven by the cam member, the fast feed direction switching member engages with either the forward fast feed drive transmitting means or the reverse fast feed drive transmitting means and moves the head chassis to reproduce the forward play. Drive transmission means or reverse Tape direction switching device of the magnetic recording tape and reproducing apparatus, characterized in that to release the transmission of the driving force of the countercurrent regeneration drive transmission means.