JPH0132192Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a control mechanism for a tape recorder, and in particular, a control mechanism for a tape recorder that can smoothly perform mode conversion operations without using a solenoid, has quiet operating noise, and can be constructed in a small size. The purpose is to provide.

Conventional tape recorder control mechanisms include multiple solenoids, such as a pinch roller crimping solenoid and a magnetic head base movement solenoid, and each solenoid is operated by a control signal from an electric circuit corresponding to each mode of operation. The configuration was such that the mode could be switched to a predetermined mode. However, in this conventional mechanism, the suction force of the solenoid is used for each predetermined mode to abruptly move and stop to switch modes, which generates shocks and crashing noises when changing modes, which is bothersome and also makes the device difficult to operate. It has disadvantages such as being complicated, large-sized, expensive, and consumes a lot of power.

The present invention eliminates the above-mentioned drawbacks, and an embodiment thereof will be described below with reference to the drawings.

FIG. 1 is a plan view of an embodiment of the tape recorder control mechanism of the present invention applied to a so-called auto-reverse type tape recorder, which is an automatic reciprocating type reversing tape recorder, in a stop mode state.

In Fig. 1, reference numeral 1 denotes a chassis base, and a head base 3 equipped with a magnetic head 2, which can rotate 180 degrees with respect to the tape running direction and change the track position, is installed on the front center upper surface of the chassis base so as to be movable in the directions of arrows _Y1 and _Y2 . There is. The head base 3 is provided with elongated holes 4 at three locations parallel to the direction of movement, and pins 5 implanted in the chassis base 1 are inserted into these holes to regulate the direction of movement of the head base 3. Furthermore, limiting protrusions 6 are provided at both rear ends of the head base 3 by rising portions. On the upper surface of both front ends of the chassis base 1, a pinch roller 7 is rotatably attached to the tip.
A, 7b, and a right pinch roller arm 10 and a left pinch roller arm 11 are provided, which are pivotally connected to two pins 8, 9 implanted in the chassis base 1, respectively. In addition, pinch roller arm 1
0 and 11 are urged to rotate in one direction by the elastic force of return coil springs 14 and 15 whose ends are hooked to fixing pins 12 and 13 installed above the chassis base 1. In addition, the pinch roller arm 10,
11 is pivotally connected to the rising part of each rear end, one end is locked to a falling part adjacent to the stopping part of each return spring 14, 15, and the other end is connected to each pinch roller 7a, 7b. Pinch roller compression torsion springs 16 and 17 are attached to the rising portions adjacent to the pinch rollers. In addition, pinch roller arm 1
0 and 11 come into contact with the limiting protrusions 6 at both rear ends of the head base 3 when returning to the stop mode position after the end of reproduction, and are kept in the stop mode position.

A head holder 18 is fixed to the head base 3 by two screws 19, and is passed through a shaft 20 integrated with the head 2. A head reversing gear 21 is fixed to this shaft 20. Further, the front wall of the holder 18 has a fan-shaped arc portion with teeth.
A fan-shaped gear 22 that meshes with the gear 21 to reverse the head 2 is rotatably attached to the shaft, and the other end opposite to the tooth portion passes through the chassis base 1 and is connected to a pin implanted on the lower surface of the chassis base 1. It is inserted into a U-shaped groove at one end of a head lever 24 which is rotatably attached to a head lever 23.

In the center of the chassis base 1 are two flywheels 29, 30 having capstans 25, 26 and fixed rollers 27, 28, respectively.
is provided at the bottom of the chassis base. Incidentally, a belt 33 made of COM is stretched around the outer periphery of the flywheels 29, 30 and the motor pulley 32.

34 is a motor for fast forwarding and rewinding mode, which is disposed on the underside of the chassis base 1;
A gear 36 is fixed to the upper surface of the gear. Further, the shaft 35 has a gear 37 rotatably attached to the tip thereof.
It rotatably supports an arm 38 having a
Gear 37 meshes with gear 36. Furthermore, gear 3
6 and arm 38 have a slip clutch (not shown).
is provided so that the arm 38 rotates in the same direction according to the rotational direction of the motor 34 by the frictional force of the sliding clutch, thereby transmitting rotational driving force to either the supply reel table 39 or the take-up reel table 40. It is set in.

Reference numeral 41 denotes a brake arm, which has elongated holes 42 parallel to the movement direction (arrows Y ₁ and Y ₂ directions) at two locations, and pins 4 implanted in the chassis base 1 into these holes.
3 is inserted. The brake arm 41 is pivoted to a pin 44 implanted in the chassis base 1, and has one end fixed to a locking pin 45 implanted in the chassis base 1, and the other end attached to a locking portion 46 of the brake arm 41. Due to the elastic force of the spring 47, the rising portion 48 adjacent to the elongated hole 42 is brought into pressure contact with each reel stand 39, 40 to apply a braking force.

The take-up idler 49 has two take-up idlers 50 and 51 which are rotatably attached to the shaft by a day lift lever, and two pins 52 installed on the upper surface of the chassis base 1 are connected to two positions parallel to the moving direction. It is inserted into the elongated hole 53 and is mounted so as to be movable in the directions of arrows X ₁ and X ₂ . Further, a U-shaped self-retaining torsion spring 54 is fixed to the center of the take-up lever 49. Reference numeral 55 is a Y-shaped pinch roller lever whose central portion is pivotally connected to a pin 56 implanted in the chassis base 1, and passes through the opening of the chassis base 1 on the right side of the center and comes into contact with the pinch roller cam 57 on the lower surface. A retaining pin 58 is implanted. Further, the lever 55 has two Y-shaped protruding parts 59 and 60 at each end, and is in contact with the pinch roller compression springs 16 and 17, so that the pinch roller arm 10 Alternatively, by rotating 11, pinch roller 7a
to the capstan 25 or pinch roller 7.
b is brought into pressure contact with the capstan 26.

Reference numeral 61 denotes a head base arm (operating member) which is rotatably attached to the upper surface of the chassis base 1 by a pin 62, and a pin 63 is implanted at the tip thereof and is fitted into a notch in the head base 3. Further, a pin 65 is implanted in the center of the head base arm 61 to pass through an opening in the chassis base 1 and to be inserted into a cam groove 64' of a head base cam 64 (cam member) on the lower surface of the chassis.

2 and 3 are a plan view and a side view of the main parts of the mechanism of the present invention. In FIG. 3, the control motor 66 is provided below the chassis base 1, and is attached to a disk base 67 that is fixed to the chassis base 1 by a support shaft or the like. On the other hand, the motor 6
A gear 68 is fixed to the upper shaft of the motor 6, and rotation transmission gears 69, 70, 71, and 72, which are similarly rotatably attached to the disk base 67, mesh with each other.
6 is transmitted to the head base cam 64.

The tape recorder control mechanism 80 is generally composed of a head base cam 64, a contact plate 73, a printed circuit board 75, and a head base arm 61.

A contact plate 73 is fixed to the bottom surface of the head base cam 64 by two pins 74 on both side edges, and both end arms of the contact plate 73 are rectangular, and the contact pieces 73a and 73b at the tips are bent into a dogleg shape. It curves and extends downward.

As shown in FIG. 4, a printed circuit board 75 facing the bottom surface of the head base cam 64 has a terminal 75 at its end.
a to 75e, and the terminal 75a is placed on the rotation locus of the tip portions 73a to 73b of the contact plate 73.
~75e is connected to the semicircular contact _75c-1 ,
75 _e-1 and radial contacts 75 _a-1 to 75 _a-4 , 75 _b-
1 to 75 _b-4 , 75 _d-1 , and 75 _d-2 . Both end portions 73a and 73b of the plate 73 are attached to contact points on the board 75 in a state in which both arms are elastically bent and are in pressure contact with each other, and slide on each contact point to adjust the head base cam 64 to each mode The position is detected by generating an electrical control signal for the rotation angle position according to the rotation angle position. Also,
Terminals 75a to 75e of the board 75 are connected to an electric circuit 76 that controls the motor 66.

Next, the operation of the control mechanism of the tape recorder having the above configuration will be explained for each mode with reference to FIGS. 5 to 7. Furthermore, since the tape recorder of this embodiment to which the mechanism of the present invention is applied is an auto-reverse machine, the forward side operation and the reverse side operation are symmetrical and the same, and as shown in Figs. 2 and 3. Since the shape of the cam groove 64' of the cam 64 of the control mechanism and the contact pattern on the board 75 are symmetrical between the forward side and the reverse side, only the operation on the forward side will be explained, and the explanation on the reverse side will be omitted. .

(1) Forward playback and recording mode (see Figure 5) When the operator operates the forward playback mode,
The counterclockwise rotation of the motor 31 is transmitted to both flywheels 29, 30 via a motor pulley 32 and a belt 33, and the rotation is transmitted to both flywheels 29, 30 through a motor pulley 32.
6 starts rotating. At the same time, the motor 66 starts rotating counterclockwise and the transmission gears 69, 70, 71, 7
2, the head base cam 64 is rotated clockwise. Following the rotation locus of the cam groove 64', the head base arm 61 rotates counterclockwise around the pin 62, and the pin 63 at the tip of the arm 61 moves the head base 3 in the direction of arrow _Y1 , causing the magnetic head to move. A tape 81 is attached to the head 2. At the same time, the head base arm 61 is connected to the brake arm 4.
1 pin 41a, and move the arm 41 in the direction of arrow Y ₁
direction, and the braking force on both reel stands 39 and 40 is released.

FIG. 6A shows the amount of movement of the head base 3 that moves according to the rotation angle of the head base cam 64, FIG. 6B shows the amount of movement of the pinch roller arms 10 and 11, and FIG.
7 shows the direction in which the magnetic head is reversed, and FIG. cam 6
4, the contact pieces 73a and 73b of the contact plate 73 on the bottom surface of the cam 64 touch the printed circuit board 7.
5. Move from the upper stop position. That is, in Figure 4,
As the cam 64 rotates 120 degrees clockwise, the inner contact piece 73a slides on the forward side semicircular contact 75c _-1 , and the outer contact piece 73b slides on the stop contact 75.
Reproduction and recording contact 75 from _d-1 to _a-2 , board 75
The end terminals 75a and 75d are brought into conduction to generate an electrical control signal, as shown in FIGS. 6A, B, and D.
It is detected that the head base 3 has moved by stroke ₄ to the reproduction position ₁ where the tape 81 is attached to the head 2 and the position where the pinch roller 7a is pressed against the capstan 25. Therefore, the electrical circuit 76
The motor 66 is stopped and the head base 3 is fixed at a predetermined playback position via the cam 64. Note that the radial contact pattern is such that contacts from the terminal 75a and contacts from the terminal 75b are arranged alternately.
When the contact plate 73 rotates, the same signal is generated alternately, but the detection position is determined by the order of the signals generated by the electric circuit 76, the rotation direction of the motor 66, the operating switch for mode setting, etc. Because of this, the position can be detected without any problem.

As the head base cam 64 rotates, the cam 6
The pinch roller cam 57 that engages with the chassis base 1 rotates counterclockwise, and the rotation of the pinch roller cam 57 causes the pinch roller lever 55 to rotate around the pin 56 implanted in the chassis base 1 via the pin 58. The pinch roller 7a is brought into pressure contact with the tape 81 and driven to pinch the tape 81. At the same time, the lever 55 moves the take-up lever 49 in the direction of arrow _X1 ,
The take-up idler 5 is activated by the elastic force of the spring 54.
0 fixed below the capstan 25
7 and the take-up reel stand 40, the rotation of the flywheel 29 is transmitted to the take-up reel stand 40, and the tape 81 sent out by the capstan 25 and the pinch roller 7a is wound up on the take-up reel stand 40. Enters forward playback state. Therefore, the tape 81 runs at a constant speed while attached to the head 2, and is recorded or reproduced.

(2) Forward fast forward mode/reverse winding mode (see Figure 7) When the fast forward mode is operated (reverse rewind mode operated), the control motor 66 rotates counterclockwise and the transmission gears 69, 70, 71, 72 rotate cam 6
4 rotates clockwise from the stop mode position, and the rotation of the arm 61 causes the brake arm 41 to move in the direction of the arrow.
Move in the _Y1 direction and release the braking action on both reel stands 39 and 40. The base 3 is rotated by the rotation of the cam 64.
is the arrow for this stroke ₃ (see Figure 6 A)
Moving in the _Y1 direction, the contact piece 73a of the contact plate 73 connects to the forward side semicircular contact 75c _-1 ,
When the contact piece 73b reaches the fast-forward mode contact 75b _-1 , it connects the terminals 75c and 75b to generate an electrical control signal and detect the forward mode position. The generation of the control signal causes the electric circuit 76 to stop the motor 66 and fix the head base 3 in the fast forward mode position. At this time, the head 2 is separated from the tape 81, and the pinch rollers 7a and 7b are also separated from the capstans 25 and 25.
It is separated from 6. When the motor 66 stops,
The fast forward/rewind motor 34 rotates counterclockwise in response to a signal from the electric circuit 76, and the arm 38 rotates counterclockwise due to the frictional force of the sliding clutch between the gear 36 and the arm 38, causing the motor 34 to rotate. A gear 37 is used to transmit the driving force to the reel stand 40.
is meshed with the gear of the reel stand 40. Therefore, the reel stand 40 rotates the tape 81 by the rotation of the motor 34.
is wound at high speed and enters the fast-forward mode.

(3) Forward cueing mode (see Figure 8) When operating the forward cueing mode, motor 6
The cam 64 rotates clockwise due to the rotation of the tape 6, and the head base 3 lightly attaches the tape 81 to the head 2 for a stroke ₂ with a small tape winding load.
(See Figure 6A) in the direction of arrow _Y1 . At this time, the contact piece 73a of the contact plate 73 reaches the contact point 75e _-1 , the contact piece 73b reaches the contact point 75a _-4 ,
The terminals 75e and 75a are brought into conduction to generate a control signal and detect the cue mode position. The control signal causes electric circuit 76 to stop motor 66 and fix head base 3 in the cue mode position. Incidentally, as shown in FIG. 6B, the pinch roller 7a has not moved to stroke ₄ and is separated from the capstan 25. When the motor 66 stops, the motor 34 rotates counterclockwise, the arm 38 rotates in the same direction, and the gear 37
is meshed with the gear of the reel stand 40. Therefore, the reel stand 40 rotates at high speed to take up the tape 81 while keeping it lightly attached to the head 2, and the tape 81 enters the cueing mode.

(4) Pause mode (see Figure 5) When you operate the pause mode to temporarily interrupt the playback or recording mode, the motor 66
rotates clockwise, and the cam 64 returns approximately 30 degrees counterclockwise. At this time, the contact piece 73a of the contact plate 73 slides on the semicircular contact 75c _-1 , the contact piece 73b comes into pressure contact with the contact 75b _-2 , and the terminals 75c and 7
5b is made conductive to generate a control signal and detect the temporary stop mode position. Therefore, the motor 66 is stopped in response to an instruction from the electric circuit 76, and the head base 3 and the pinch roller 7a are fixed at the temporary stop mode position via the cam 64. That is, as shown in FIGS. 6A and 6B, the head base 3 has a stroke with the tape 81 attached to the head 2 in the same way as in the playback mode.
The pinch roller lever 55 returns to the stop position after moving for _one minute, and the pinch roller 7a is separated from the capstan 25, and the take-up lever ₄₉ moves in the direction of arrow and capstan roller 2
7 and enters the pause mode state.

As mentioned above, the control mechanism of the tape recorder according to the present invention includes a cam member having a cam portion and rotated by a control motor, and a cam member that engages with the cam portion and moves according to the rotation of the cam member to perform various mode conversions. an operating member, a contact piece integrally provided on the bottom surface of the cam member, and a wiring board comprising a plurality of contacts facing the bottom surface of the cam member and arranged at rotation locus positions of the contact piece. When the operation member reaches the desired mode conversion position due to the rotation of the cam member, the contact piece contacts the contact point on the wiring board at a position corresponding to the rotation position of the cam member, so that the operation member changes to the desired mode conversion position. Since it is configured to output an electrical control signal using a solenoid, there is no collision noise that occurs when a solenoid is used during mode conversion.
Modes can be changed smoothly and quietly according to the shape of the cam groove, and since the shape of the cam groove of the cam member and the position of the contact points are formed according to each mode, the rotational position and mode state of the cam member can be changed as appropriate using electrical signals. can be detected,
It is particularly effective for mode position detection control of auto-reversing machines with a large number of modes, and can easily respond to changes in the number of modes, for example, and can save power consumption by rotating the control motor only when changing modes. Furthermore, since multiple solenoids are not used, the configuration is simple and compact, and can be manufactured at low cost.The magnetic head moves smoothly during playback mode, etc., so even if the tape is installed in a loose state, it can be used as a tape guide, etc. It has features such as not damaging the tape and causing no adverse effects on the tape due to the heat generated by the solenoid.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the tape recorder control mechanism according to the present invention in a stop mode state, FIG. 2 is a plan view of the main parts of the control mechanism in a head reversal mode state, and FIG. Fig. 4 is a diagram showing the rotational position of the contact piece with respect to each contact in the stop mode, Fig. 5 is a plan view of the forward regeneration mode state, Fig. 6 A, B, C, D 7 is a diagram of the head base, pinch roller, head direction, and control signal with respect to the rotation angle of the head base cam, respectively, and FIG. 7 is a plan view of the forward rapid traverse mode state. 2...Magnetic head, 3...Head base, 7
a, 7b...Pinch roller, 10, 11...Pinch roller arm, 18...Head holder, 25,
26... Capstan, 27, 28... Laura,
29, 30...flywheel, 31...drive motor, 33...belt, 34...motor for fast forward and rewind mode, 38...arm, 39...supply reel stand, 40...take-up reel stand, 41...Brake arm, 49...Take-up lever, 5
0,51...Taitaup idler, 55...
Y-shaped pinch roller lever, 57...Pinch roller cam, 61...Head base arm, 64...
Head base cam, 64'...cam groove, 66...
...control motor, 69-72...rotation transmission gear,
73...Contact plate, 73a, 73b...
... Contact piece, 75 ... Printed circuit board, 75a to 75e
...Terminal, 75 _a-1 ~ 75 _a-4 , 75 _b-1 ~ 75 _b-4 ,
75 _c-1 , 75 _d-1 , 75 _d-2 , 75 _e-1 ...Contact, 7
6... Electric circuit, 80... Tape recorder control mechanism, 81... Magnetic tape.

Claims (1)

[Claims for Utility Model Registration] (1) A cam member having a cam portion and rotated by a control motor, and a cam member that engages with the cam portion and moves in accordance with the rotation of the cam member to perform various mode conversions. A wiring board comprising: an operating member that rotates; a contact piece integrally provided on the bottom surface of the cam member; and a plurality of contacts facing the bottom surface of the cam member and arranged at rotation locus positions of the contact piece. Therefore, when the operating member reaches the desired mode conversion position due to the rotation of the cam member,
A control mechanism for a tape recorder configured to output an electric control signal according to the mode conversion position by abutting the contact piece with a contact point on the wiring board at a position corresponding to the rotational position of the cam member. (2) The output electric control signal stops the rotation of the control motor.Claim No. (1)
Control mechanism of the tape recorder described in Section 1.