JP2553876Y2 - Tape recorder - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette tape recorder, and more particularly, to a cassette tape recorder capable of performing a backward play (R-PLAY).

[0002]

2. Description of the Related Art Since a large-capacity solenoid is required for a solenoid that uses a solenoid as a drive source for switching operations such as play, fast-forward, and rewind, a cam gear driven by a flywheel gear is used as a main drive source. A driving device for a cassette tape recorder that performs the above operations is disclosed in
No. 142765.

[0003]

[Problems to be Solved by the Invention] However, in the above-mentioned conventional device, since each switching operation is controlled by a plurality of solenoids, an operation arm is required for each solenoid, and the mechanism is complicated. There was a problem. Also, since the weight of the solenoid is large and expensive, the weight of the entire tape recorder increases, and
There was a disadvantage that the cost was high.

[0004] The present invention has been made in view of the above points, and its purpose is to provide a solenoid with one solenoid.
An object of the present invention is to provide a lightweight and inexpensive tape recorder by using only one.

[0005]

According to the tape recorder of the present invention, a cam gear having a toothless portion and a gear rotated in one direction by a tape drive motor are meshed by the operation of a trigger arm driven by a solenoid. The head chassis supporting the magnetic head is driven by the cam, and a play direction selection slider slidably supported by the head chassis is driven by a cam groove having a branch provided on the cam gear, and branch control of the cam groove is performed. The selector slider is driven by the trigger arm to select any one of fast forward, rewind, and play, and its position is controlled by the solenoid timing control. By driving the head chassis through The drive stroke of the head chassis set by the position of the select slider, further, it is the rotation of the fast feed intermediate gear arm those configured to control based on the position of the select slider.

In the tape recorder, a pinch roller holder and an intermediate gear arm for low-speed feeding are driven by integral movement of the head chassis and a play direction selection slider, and a high-speed feeding is performed by a select slider driven by the cam gear. It is configured to drive an intermediate gear arm.

Further, in the tape recorder, a pinch roller pressed against the forward-direction capstan or the backward-direction capstan is selected according to the position of the play direction selection slider, and the moving direction of the intermediate gear arm for low-speed feeding is selected. It is what was constituted.

[0008]

According to the tape recorder of the present invention, since the magnetic head, the pinch roller holder, the intermediate gear arm for high-speed feeding and the intermediate gear arm for low-speed feeding are driven by the cam gear, the capacity of the solenoid can be small, and the solenoid can be used. Since only one is used, the weight of the tape recorder is small and the mechanism is simple.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A tape recorder according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing a tape recorder according to an embodiment of the present invention. In the figure,
Reference numeral 1 denotes a chassis made of sheet metal, to which a plastic mechanical base 2 is fastened. Reference numeral 3 denotes a tape drive motor, which is fastened to the mechanical base 2. A pulley 3a is fixed to the rotation shaft of the tape drive motor 3. The forward direction capstan 4 is rotatably supported by a bearing provided on a housing 10 fastened to the chassis 1. The forward direction capstan 4 includes a gear 4 b and a flywheel 4.
a is fixed. The retraction capstan 5 is rotatably supported by a bearing provided on a housing 11 fastened to the chassis 1. A flywheel 5 a is fixed to the retraction capstan 5. The pulley 7 is rotatably supported on the shaft 6.

FIG. 2 shows a belt 9 wound around each pulley.
The state of is shown. FIG. 2 is a diagram viewed from above in FIG. Pulley 3a, pulley 7, and flywheel 4a rotate counterclockwise, and flywheel 5a rotates clockwise. As shown in FIG. 3, the shaft 6 is rotatably supported on the mechanical base 2 via a bearing, and the shaft 6 has a gear 6
a, the friction plate 6b and the stopper 6c are fixed.
A compression coil spring 8 is arranged between the pulley 7 and the stopper 6c, and the pulley 7 is pressed against the friction plate 6b. The friction torque between the pulley 7 and the friction plate 6b is so large that the pulley 7 and the friction plate 6b do not slip during normal tape feeding, and not so large that the tape breaks at the tape end.

Reference numeral 12 shown in FIG. 1 is a head chassis.
The chassis 1 is slidably supported in the front-rear direction and urged forward by a spring (not shown). A magnetic head housing 13 is fixed to the head chassis 12, and the magnetic head housing 13 holds the magnetic head at 180 °.
It is rotatably supported. A gear 14 provided integrally with the magnetic head meshes with a fan gear 15 rotatably supported by the magnetic head housing 13. A torsion coil spring 16 hung between the fan gear 15 and the magnetic head housing 13 stabilizes the two rotation positions of the fan gear 15.

Reference numeral 17 denotes a play direction selection slider which is supported by the head chassis 12 so as to be slidable in the left-right direction.
The groove of the downward bent portion 17a provided on the play direction selection slider 17 is engaged with the projection 18a of the cam groove driven slider 18, and the play direction selection slider 17 is driven in the left and right direction by the cam groove driven slider 18. . The groove 17b of the play direction selection slider 17 is engaged with an arm provided integrally with the fan gear 15, and the play direction selection slider 1
Numeral 7 rotates the fan gear 15 to reverse the magnetic head.
One of the upward bent portions 17c and 17d provided on the play direction selection slider 17 is engaged with one of the inner arms of the torsion coil springs 23 and 24 provided on the pinch roller holders 19 and 20. One of the projections 17e and 17f of the play direction selection slider 17 is engaged with either the left or right arm of the torsion coil spring 26 provided on the intermediate gear arm 25 for low-speed feeding. The drawing shows a case where the play direction selection slider 17 is at the position in the tape forward direction, and only the protrusion 17f is shown by a dotted line for the position in the tape backward direction.
The pinch roller holders 19 and 20 are rotatably supported on shafts provided in the housings 10 and 11, respectively, and rotatably support the pinch rollers 21 and 22. The outer arms of the torsion coil springs 23 and 24 provided on the pinch roller holders 19 and 20 are in pressure contact with the projections 2c and 2b of the mechanical base 2, and the pinch rollers 21 and 22 are usually separated from the capstans 4 and 5. .

The slider 27 is supported by the chassis 1 so as to be slidable in the front-rear direction, and the select slider 28 is supported by the slider 27 so as to be slidable in the left-right direction. The cam gear 29 is rotatably supported by a shaft 2a provided integrally with the mechanical base 2. The trigger arm 30 is rotatably supported by a shaft 2 d provided integrally with the mechanical base 2, and is urged clockwise by a tension coil spring 31 hung between the trigger arm 30 and the mechanical base 2. The upward movement of the cam gear 29 and the trigger arm 30 is regulated by the chassis 1. The trigger arm 30 is further engaged with a plunger 32a of a solenoid 32 fixed to the chassis 1.

The intermediate gear arm 25 for low-speed feeding is rotatably supported by the chassis 1, and rotatably supports the gear assembly 33 by a shaft 25a which is provided upright. The structure of the gear assembly 33 is shown in FIG. As shown in the figure, a gear 40 is press-fitted into a base 39 rotatably supported on a shaft 25a, and a compression coil spring 42, a gear 41 and a felt 43 are arranged therebetween. That is, a friction clutch is formed by the gear 40, the felt 43, and the gear 41, and the friction torque is not large enough to slip the tape from the capstan during play.

The gear 34 is rotatably supported by the mechanical base 2, and its large gear meshes with the large gear of the gear 6a. The intermediate gear arm 35 for high-speed feeding is rotatably supported by the mechanical base 2 via a shaft 35a, and is urged to a neutral position shown in the figure by a torsion coil spring (not shown). The intermediate gear arm 35 for high-speed feeding has an intermediate gear 3
6, 36 are rotatably supported. Supply side reel base 3
Numeral 7 is rotatably supported by the mechanical base 2, and a large gear 37a is integrally formed at an upper portion and a small gear 37b is integrally formed at a lower portion. The take-up reel base 38 is rotatably supported by the mechanical base 2, and has a large gear 38 a at the upper part and a small gear 3 at the lower part.
8b are integrally formed.

FIGS. 4 and 5 show the relationship between the cam gear 29 and the trigger arm 30. FIG. FIG. 4 shows a state where the cam gear 29 is at the rotation position in the tape recorder stop state.
In this state, the force of the spring for urging the head chassis 12 is applied to the cam 29e provided on the cam gear 29 via the bent portion 27a of the slider 27, and the cam gear 29 is urged clockwise. The protrusion 29 provided on the trigger arm 30 is provided with a stopper 29 c provided on the trigger arm 30.
0a, the cam gear 29 is stopped. At this time, the gear around the cam gear 29 has the toothless portion 29a facing the gear 4b, and the gear 4b and the cam gear 29 are not meshed.

In the state shown in FIG. 4, when the solenoid 32 is energized for 50 msec, the plunger 32a rotates the trigger arm 30 counterclockwise against the elasticity of the tension coil spring 31 to engage the stopper 29c with the projection 30a. Is released, the cam gear 29 rotates clockwise, comes into mesh with the gear 4b, and is further driven clockwise by the gear 4b to rotate to the position shown in FIG. At this time,
The slider 27 is moved to the rearward position in FIG.

FIG. 5 shows a state in which the cam gear 29 is in a rotating position in a tape recorder play state, a fast-forward state, or a rewind state. In this state, the force of the spring biasing the head chassis 12 is applied to the select slider 28 and the slider 27.
The cam gear 29 is urged clockwise through the bent portion 27a of the cam gear 29 via the bent portion 27a.
Abuts on a projection 30a provided on the trigger arm 30, and the cam gear 29 is stopped. At this time, the gear around the cam gear 29 has the toothless portion 29b facing the gear 4b, and the gear 4b and the cam gear 29 are not meshed.

In the state shown in FIG. 5, when the solenoid 32 is energized for 50 msec, the plunger 32a rotates the trigger arm 30 counterclockwise against the elasticity of the tension coil spring 31 to engage the stopper 29d with the projection 30a. Is released, the cam gear 29 rotates clockwise, comes into mesh with the gear 4b, is further driven clockwise by the gear 4b, and is rotated to the position shown in FIG. At this time,
The slider 27 is moved to the forward position in FIG.

FIGS. 6 and 7 show the relationship between the cam gear 29 and the cam groove driven slider 18. FIG. The state of the back surface of the cam gear 29 is drawn by a dotted line, and the state of the front surface is not described. The rotational position of the cam gear 29 is the same between the state in FIG. 4 and the state in FIG. 6, and the same in the state in FIG. 5 and the state in FIG. The cam groove driven slider 18 is urged rightward by the torsion coil spring 44, and the right end thereof is in contact with the projection 30b of the trigger arm 30 in the state of FIG. In addition,
The biasing force of the torsion coil spring 44 is smaller than the biasing force of the tension coil spring 31. Projection 18 of cam groove driven slider 18
b is engaged with a cam groove 29f having a branch formed on the back surface of the cam gear 29.

As described above, 50 ms from the state shown in FIG.
When the solenoid is energized by ec, the cam gear 29 rotates to the position shown in FIG. 150 ms after energizing the solenoid
When the solenoid is energized immediately before the passage of ec, the trigger arm 30 rotates counterclockwise, and the projection 18b passes through the groove outside the cam groove 29f, and the cam groove driven slider 1
8 is not moved, but 150m after energizing the solenoid
If the solenoid is not energized immediately before the lapse of sec, the trigger arm 30 rotates clockwise and the protrusion 18
"b" passes through the groove inside the cam groove 29f, and the cam groove driven slider 18 is moved leftward to the state shown in FIG. At this time, the play direction selection slider 17 is moved leftward by the projection 18a, and the magnetic head is in the reversed state (R-PLA).
Y position).

FIGS. 8 to 10 show the relationship between the select slider 28 and the trigger arm 30. FIG. FIG. 8 shows a state where the cam gear 29 is in the state (stop state) shown in FIG. The protrusion 28f of the select slider 28 is engaged with the hole 30c of the trigger arm 30, and the select slider 28 is moved in the left-right direction by the trigger arm 30. The downward bent portion 12b of the head chassis 12 protrudes into the hole 28b of the select slider 28 and the hole 27b of the slider 27, and the head chassis 12 is pushed backward by the select slider 28. The head chassis 1
2 does not show a portion other than the bent portion 12b.

When the solenoid is energized from the stop state shown in FIG. 8, as described above, the cam gear starts rotating, and the bent portion 27a of the slider 27 moves in the direction of the arrow to push the select slider 28. When the select slider 28 advances in the direction of the arrow, it presses the bent portion 12b. When the solenoid is energized for 50 msec and then the energization is stopped, the trigger arm 30 rotates clockwise when the select slider 28 is pressed against the bent portion 12b, and the select slider 28 is moved to the left position shown in FIG. is there. In addition,
The clockwise rotation of the trigger arm 30 is limited by the contact between the end surface 28c of the hole of the select slider 28 and the bent portion 12b. When the cam gear rotates to the play position in this state, the head chassis 12 largely moves backward. At this time, when the play direction selection slider 17 is at the right position, that is, the normal rotation position of the head, the bent portion 17d pushes the inner arm of the torsion coil spring 23 to press the pinch roller 21 against the capstan 4 and feed the tape to the right. . Also,
A torsion coil spring 26 provided on the intermediate gear arm 25 for low-speed feeding has a projection 17e of the play direction selection slider 17.
To rotate the intermediate gear arm 25 for low-speed feeding clockwise. Accordingly, the small gear of the gear 6a meshes with the gear 40 of the gear assembly 33, and the gear 41 meshes with the large gear 38a of the take-up reel base 38. That is, take-up torque is applied to the take-up reel base 38 via the clutch of the gear assembly 33. The magnetic head is in contact with the tape, and the tape recorder plays forward (F-
PLAY) state. Also, when the head chassis 12 moves backward in the above state, the play direction selection slider 17
Is in the left position, that is, in the head reverse position, the bent portion 17
c pushes the inner arm of the torsion coil spring 24 to press the pinch roller 22 against the capstan 5 to feed the tape to the left. Also, the projection 17f of the play direction selection slider 17
Pushes the right arm of the torsion coil spring 26 provided on the low-speed intermediate gear arm 25 to rotate the low-speed intermediate gear arm 25 counterclockwise. Therefore, the gear 34
Meshes with the gear 40 of the gear assembly 33 and the gear 41 meshes with the large gear 37a of the supply reel base 37. That is, the take-up torque is applied to the supply-side reel base 38 via the clutch of the gear assembly 33. The magnetic head is in contact with the tape, and the tape recorder enters a backward play (R-PLAY) state.

When the solenoid is energized from 150 msec to 300 msec after the solenoid energization is started from the cam gear stop state, and when the solenoid energization is stopped thereafter, the bending portion 12b moves the select slider 28 to the position shown in FIG.
In the intermediate position shown in (1), the slider 27 is pushed by the edge 27c of the hole 27b. That is, the trigger arm 30 is urged in the counterclockwise direction immediately before the upper surface of the step of the hole 28b of the select slider 28 comes into pressure contact with the bent portion 12b, and the protrusion 28a of the select slider 28 becomes the protrusion of the intermediate gear arm 35 for high-speed feeding. It is urged clockwise before it presses 35b. Also, the select slider 28
The bent portion 12b is pressed in a state where the end surface 28d of the hole is in contact with the bent portion 12b. At this time, the stroke of the head chassis 12 is small, and the pinch roller does not come into pressure contact with the capstan. Also, the intermediate gear arm 25 for low-speed feeding is used.
Is rotated by the protrusion 25 b and the end face 1 of the hole of the head chassis 12.
Limited by contact with 2a, gear 40 of gear assembly 30 does not mesh with gear 6a or 34. The projection 35b of the intermediate gear arm 35 for high-speed feed is pushed by the right inclined end face of the projection 28a of the select slider 28, and the intermediate gear arm 35 for high-speed feed rotates counterclockwise, and the intermediate gear 36 on the right is the large gear and the winding of the gear 6a. Intake reel base 3
The small take-up reel base 38 meshes with the small gear 38b of No. 8 is rotated counterclockwise at a high speed. The select slider 28 receives a reaction force in the left direction.
e supported by the end face 2f and the end face 28d of the hole 28b.
Is supported by the bent portion 12b, and the select slider 28 does not move leftward. The magnetic head is lightly in contact with the tape. When the magnetic head is in the normal rotation position, the magnetic head is in the normal rotation position fast-forward (F-FF) state. -RE
W) state.

When the solenoid is energized from 150 msec to 450 msec from the start of energization of the solenoid from the cam gear stop state, and then energization of the solenoid is stopped, the bending portion 12b is turned by the select slider 28 as shown in FIG.
At the right side position indicated by 0, the slider 27 is pushed by the edge 27c of the hole 27b. That is, immediately before the upper surface of the step of the hole 28b of the select slider 28 comes into pressure contact with the bent portion 12b, the trigger arm 30 has the protrusion 28a of the select slider 28
Until the protrusion 35b of the select slider 28 is pressed, the bent portion 12b is pressed while the end surface 28e of the hole of the select slider 28 is in contact with the bent portion 12b.
At this time, the stroke of the head chassis 12 is small, and the pinch roller does not come into pressure contact with the capstan. In addition, the rotation of the intermediate gear arm 25 for low-speed feeding is caused by the protrusion 25b.
The gear 40 of the gear assembly 30 does not mesh with the gear 6a or 34, limited by the contact between the gear 40 and the end surface 12a of the hole of the head chassis 12. The protrusion 35b of the intermediate gear arm 35 for high-speed feed is the protrusion 2 of the select slider 28.
8a, the intermediate gear arm 35 for high-speed feed is rotated clockwise, and the intermediate gear 36 on the left is
The large gear and the small gear 37b of the supply side reel base 37 mesh with each other, and the supply side reel base 37 is rotated clockwise at high speed.
The select slider 28 receives a rightward reaction force, but the protrusion 2
8g is supported by the end face 2g of the guide 2e of the mechanical base 2, and the end face 28e of the hole 28b is supported by the bent portion 12b, so that the select slider 28 does not move rightward. The magnetic head is in light contact with the tape, and if the magnetic head is in the normal rotation position, the magnetic head is rotated forward (F-
(REW) state, and if the magnetic head is in the reversing position, the magnetic head is in a reversing position fast forward (R-FF) state.

FIG. 12 shows a time chart of the state transition described above. In the figure, the starting point of transition to each state shown in the upper part is indicated by a vertical line below it. The periods indicated by the alphabets A to L at the bottom indicate transition periods. The time is indicated by a number in msec units. In addition, the upper line of the graph indicates solenoid energization, and the lower line indicates stop of solenoid energization.

[0027]

According to the tape recorder of the present invention, the magnetic head, the pinch roller holder, the intermediate gear arm for high-speed feed and the intermediate gear arm for low-speed feed are driven by the cam gear, so that the capacity of the solenoid can be small. Since only one solenoid is used, the weight of the tape recorder is small and the mechanism is simple. Further, since the magnetic head, the pinch roller holder, the intermediate gear arm for high-speed feeding and the intermediate gear arm for low-speed feeding are driven by one cam gear, operation noise is reduced.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing a tape recorder according to an embodiment of the present invention.

FIG. 2 is a diagram showing a motor drive system of the tape recorder.

FIG. 3 is a sectional view showing a part of the tape recorder.

FIG. 4 is a plan view showing a part of the tape recorder.

FIG. 5 is a plan view showing a part of the tape recorder.

FIG. 6 is a plan view showing a part of the tape recorder.

FIG. 7 is a plan view showing a part of the tape recorder.

FIG. 8 is a plan view showing a part of the tape recorder.

FIG. 9 is a plan view showing a part of the tape recorder.

FIG. 10 is a plan view showing a part of the tape recorder.

FIG. 11 is a sectional view showing a part of the tape recorder.

FIG. 12 is a time chart showing a state transition of the tape recorder.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 chassis 2 mechanical base 3 tape drive motor 4 forward-direction capstan 5 backward-direction capstan 6 shaft 7 pulley 8 compression coil spring 9 belt 12 head chassis 18 cam groove driven slider 25 intermediate gear arm for low-speed feed 27 slider 28 select slider 29 cam gear 30 Trigger arm 35 Intermediate gear arm for high-speed feed 37 Supply-side reel table 38 Rewind-side reel table

Continuation of the front page (51) Int.Cl. ⁶ Identification code Agency reference number FI Technical display location G11B 15/44 602 G11B 15/44 602N 602V 611 611D 621 621A

Claims (3)

(57) [Scope of request for utility model registration] A cam chassis having a toothless portion meshes with a gear rotated in one direction by a tape drive motor by an operation of a trigger arm driven by a solenoid, and a cam chassis of the cam gear supports a magnetic head. When driven, the play direction selection slider slidably supported by the head chassis is driven by a cam groove having a branch provided in the cam gear, and the branch control of the cam groove is performed by controlling the energization timing of the solenoid, and the rapid feed is performed. By driving the select slider for selecting any one of rewind and play by the trigger arm and controlling its position by controlling the energization timing of the solenoid, and driving the head chassis via the select slider, The drive stroke of the head chassis is The tape recorder is configured to be set according to the position of a target slider, and to further control the rotation of the intermediate gear arm for high-speed feeding based on the position of the select slider. 2. A pinch roller holder and a low-speed intermediate gear arm are driven by an integral movement of the head chassis and a play direction selecting slider, and a high-speed intermediate gear arm is driven by a select slider driven by the cam gear. 2. The tape recorder according to claim 1, wherein 3. The apparatus according to claim 1, wherein a pinch roller which presses against the forward-direction capstan or the backward-direction capstan is selected according to the position of the play-direction selection slider, and the moving direction of the intermediate gear arm for low-speed feeding is selected. 2
Tape recorder.