JPH0355128Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a head board drive mechanism that can be used, for example, in a tape recorder for an answering machine.

For example, there is a double cassette tape recorder as a tape recorder for answering machines. This type of tape recorder has two types: a playback cassette tape that plays back a prerecorded message and sends it to the other party when the other party calls, and a recording cassette tape that records the message from the other party. It has become a double cassette tape recorder using This type of double cassette tape recorder that has been commonly used in the past has been of the type in which two cassettes are loaded in parallel in the horizontal direction.
However, this type of system has the problem that it is essentially the same as installing two tape recorders, and the installation area becomes large. Therefore, only one set of magnetic heads, pinch rollers, capstans, etc. is provided, and the playback cassette and recording cassette are loaded one on top of the other, and these stacked cassettes are moved integrally in the thickness direction of the cassette. It has also been proposed to selectively perform reproduction and recording by The one described in Japanese Patent Application Laid-open No. 57-24150 is one of them. However, according to the conventional tape recorder with stacked cassettes, in order to selectively perform playback and recording, it is necessary to move the two cassettes in a stacked state. This requires space for two cassettes to move, which increases the size of the tape recorder and makes it impossible to reduce the installation area sufficiently.

SUMMARY OF THE INVENTION An object of the present invention is to provide a head board drive mechanism for a tape recorder that is capable of reducing the overall size and installation area, and has a relatively simple configuration.

The feature of this invention is that in a tape recorder in which a recording cassette and a playback cassette are stacked in two layers, a head board is fitted into the upper and lower guide grooves, and the head board is moved back and forth by an assist cam. However, a switching mechanism is provided below the head board for causing the head board to enter either the upper or lower side of the bifurcated guide groove in response to a selection signal.

The invention will now be described with reference to the illustrated embodiment, which is configured as a tape recorder for an answering machine.

1 to 5, a pair of left and right (top and bottom in FIG. 1) guide walls 12, 12 are fixed on the chassis 1 at its front. The guide walls 12, 12 have guide grooves 13, 14 of the same shape on the front side and the back side, respectively. These guide grooves 13 and 14 have approximately horizontal grooves 13a and 14a on the front side, respectively, and grooves 13a and 14a in the near horizontal direction.
upper grooves 13b, 14b and lower grooves 13c, which branch into two from a and 14a toward the back;
14c. A head board 2 is mounted on the chassis 1 so as to be movable in the front-rear and up-down directions. Two pins 2a, 2a are fixedly planted on both left and right end surfaces of the head board 2, and these pins 2a, 2a are connected to the guide groove 1.
3 and 14, respectively. The head board 2 is urged to move downward and forward by the elastic force of a spring 15 applied between the head board 2 and the chassis 1. This urging force causes the pins 2a, 2a to move to the grooves 13a, 14a on the front side of the guide grooves 13, 14. The head substrate 2 is provided with magnetic heads 16, 17 and a pinch roller 18. A sliding plate 3 is provided between the chassis 1 and the head board 2.
is provided so as to be slidable in the front-rear direction by appropriate guide means. A pair of guide shafts 3 are provided on the sliding plate 3.
a, 3a are fixedly implanted, and these guide shafts 3a, 3
In a, a guide hole 2 provided in the head substrate 2 is shown.
d and 2d are fitted, and the head substrate 2 is guided in vertical movement by the guide shafts 3a and 3a.

As shown in FIG. 5, a bent part 3b is formed at the front end of the sliding plate 3, and this bent part 3b has a bell-crank-shaped assist that can rotate about a shaft 19. A pin 4a at the end of one arm of the lever 4 comes into contact with it. Assist lever 4 has spring 20
The pin 4a is urged to rotate in a direction away from the bent portion 3b of the sliding plate 3, but the pin 4b fixed to the other arm end of the assist lever 4 is attached to the outer periphery of the assist cam 5. By contacting the cam edge, the rotation due to the biasing force is restricted. Then, when the assist cam 5 rotates, the pin 4b is pushed by the cam edge, the assist lever 4 is rotated counterclockwise, and the bent part 3b of the sliding plate 3 is pushed backward by the pin 4a, and the pin 4b is pushed by the cam edge. hand,
The head board 2 is adapted to be moved rearward. The assist cam 5 is connected to the shaft 2 integrally with the gear 21.
It is rotatably provided around 2. gear 21
The gear 21 is designed to mesh with the pinion 23 of the drive source 6, but the gear 21 is formed with two toothless portions 21a, so that the gear 21 and the pinion 23 cannot mesh with each other at these toothless portions. It's summery. There are two pins 26, 2 on the top of the gear 21.
6 is firmly implanted, and the pinion 23 is attached to the missing teeth 21a, 2
When facing one of the pins 1a, the pin 26,
One arm of the spring 27 hits one of the springs 26, and the elastic force of the spring 27 biases the gear 21 to rotate in the clockwise direction in FIG. and pinion 23
It is becoming possible for the two to engage with each other. A pin 21b is fixedly planted on the lower surface of the gear 21. pin 2
One end of a control rod 9, which is rotatably provided in a horizontal plane about a shaft 24, comes into contact with 1b. The control rod 9 is urged to rotate clockwise in the figure by a spring 25. On the lower surface of the gear 21, other pins 21c and 21d are closely fixed on the same radius as the fixed position of the pin 21b. The spacing between the pins 21c and 21d is such that one end of the control rod 9 can fit therein, and when one end of the control rod 9 is in contact with the pin 21c, one end of the control rod 9 Even when the pinion 23 is in contact with the pin 21d, the pinion 23 faces the toothless part 21a of the gear 21, and the spring 27
The gear 21 is urged to rotate by. A pin 28 is fixed to the other arm end of the control rod 9. A control member 29 whose position in the longitudinal direction is controlled by the solenoid 8 is in contact with the pin 28 . In a normal state in which the solenoid 28 is not energized, the control rod 9 rotates due to the biasing force of the spring 25, and one arm of the control rod 9 engages the pin 21 of the gear 21.
b, 21c, and 21d, and resists the rotation biasing force of the gear 21 by the spring 27.
It is designed to prevent rotation of 1. When the solenoid 8 is energized, the control member 29 is attracted and rotates the control rod 9 against the biasing force of the spring 25.
1c and 21d, the gear 21 is rotated by the biasing force of the spring 27, and the gear 21 is meshed with the pinion 23.

5 to 7, a guide plate 7 is provided at the front end of the chassis 1 so as to be rotatable in a vertical plane about a shaft 30. As shown in FIGS. One arm end 7a of the guide plate 7 is located below the head board 2. The guide plate 7 is biased by a spring 31 to rotate counterclockwise in FIG. However, the biasing force of the spring 31 in the direction of pushing up the head board 2 is smaller than the biasing force of the spring 15 in the direction of pushing down the head board 2.
Therefore, the head substrate 2 is normally biased in a downward direction. The guide plate 7 has a vertical bent portion 7d at the back and an inclined bent portion 7c at the front. The bent portion 7d is penetrated by a guide rod 10 that extends integrally from the control member 29. The front end of the guide rod 10 forms a bent portion 10a. Guide plate 7 as shown in Figure 6.
is rotated by the biasing force of the spring 31, the guide plate 10 is lifted by the bent portion 7d of the guide plate 7, and the bent portion 10 of the guide rod 10 is lifted up by the bent portion 7d of the guide plate 7.
a is arranged to face the bent portion 7c of the guide plate 7. On the other hand, when the guide plate 7 is pushed around by the head board 2 against the biasing force of the spring 31 as shown in FIG. 7, the guide rod 10 is pushed down by the bent portion 7d of the guide plate 7, and the guide rod The bent portion 10a of the guide plate 7 moves below the bent portion 7c of the guide plate 7.

The component including the sliding plate 3, the guide plate 7, the solenoid 8, the guide rod 10, the guide groove 13, etc., connects the pins 2a, 2a of the head board 2 to the guide groove 1.
3, 14 upper and lower groove portions 13b, 14b or 13
It constitutes a switching mechanism that allows entry into either one of c and 14c.

The solenoid 8 is controlled by a control circuit (not shown), and as will be explained later, signals having different time lengths are applied as selection signals for each operation mode to control the excitation time. , this allows switching to a predetermined mode.

In Figures 2 and 3, A is a recording cassette tape for recording messages from the other party;
B is a reproduction cassette tape for sending prerecorded messages to the other party. These cassette tapes are designed so that first, a reproduction cassette tape B is loaded, and then a recording cassette tape A is loaded on top of this. In this case, since the cassette tape has a thick portion and a thin portion, it is not possible to position the tape in a predetermined position simply by overlapping two cassettes, and a predetermined holding mechanism is required. Figures 1, 8 to 1
In FIG. 1, reference numeral 11 indicates the above-mentioned holding mechanism. The holding mechanism 11 includes a cassette receiving member 32, a bearing member 33 that pivotally supports the receiving member, and the receiving member 3.
It consists of a click spring 34 that urges the chassis 2 to rotate, and is provided at the rear end of the chassis 1, as shown in FIG. The shaft 32a of the cassette receiving member 32 is rotatably supported by a bearing member 33 in a vertical plane. The cassette receiving member 32 has an operating arm 32b that receives the rear edge of the lower surface of the playback cassette B when it is loaded, an upper rear edge of the playback cassette B, and a lower rear edge of the recording cassette A. It has a holding part 32c that should intervene between them. In a normal state in which no cassette tape is loaded, the cassette receiving member 32 is urged to rotate clockwise by the click spring 34, as shown in FIG. It is designed to advance onto the loading path of B. Further, when the reproducing cassette B is pushed down to a predetermined position and loaded from the above state, the working arm portion 32b of the cassette receiving member 32 is moved toward the cassette B.
It is designed to rotate counterclockwise when pushed by. As shown in FIG. 10, when the cassette B is in contact with the positioning members 35 and 36, the click spring 34 exceeds the point and the cassette receiving member 32 is now urged to rotate counterclockwise. The pressing portion 32c presses the upper edge of the rear end of the cassette B downward. The holding part 32
The vertical dimension of c is twice the height difference between the thick and thin parts of the cassette, and as shown in FIG.
Recording cassette A is held down by 2c.
When the cassettes A and cassette B are loaded in an overlapping manner, the thick part of cassette A overlaps the thick part of cassette B, and the thin part of cassette A overlaps the holding part 22c, so that cassette A becomes parallel to cassette B. It is designed to be loaded in a predetermined manner.

In FIG. 2, the contact piece of the detection switch 41 is located on the side of the groove 14b on the upper side of the guide groove 14 formed in the guide wall 12, and the pin 2a of the head board 2 is placed on the side of the groove 14b. When it enters the groove 14b, the contact piece is pushed by the pin 2a and the switch 41 is turned on.
Further, a contact piece of the detection switch 42 is located on the side of the groove 14c on the lower side of the guide groove 14,
When the pin 2a of the head board 2 enters the groove 14c on the lower side, the contact piece is pushed by the pin 2a and the switch 42 is turned on.

Next, the operation of the above embodiment will be explained. Now, the 8th
As explained with reference to FIGS. 11 to 11, it is assumed that after the reproducing cassette B is loaded, the recording cassette A is loaded thereon. In the normal state, the pin 4b of the assist lever 4 is
hits the mesial cam edge of the assist cam 5, and the assist lever 4 rotates clockwise in FIG.
Head board 2 moves to the front and magnetic head 1
6 and 17 are spaced apart from the cassette tape, and the pinch roller 18 is spaced apart from the capstan shaft. Further, as the head board 2 moves toward the front as described above, the pins 2a of the head board 2 move into the grooves 1 on the front side of the guide grooves 13 and 14.
3a and 14a, and the head 1
6, 17 and a pinch roller 18 are arranged to face each other in the middle of the two cassettes A and B.

In the above-described embodiment, suppose that a telephone call has come in the past. First, a short signal is output from a control circuit (not shown), and the solenoid 8 is momentarily excited by this signal. The control member 29 is attracted by the solenoid 8 by the excitation of the solenoid 8, the pin 28 is pushed by the control member 29, and the control rod 9 is rotated counterclockwise in FIG. 5 against the elasticity of the spring 25. One arm end of the control rod 9 escapes from the pin 21b of the gear 21. Gear 21 is its pin 26
is rotated within the range of the toothless portion 21a by being pushed by the elasticity of the spring 27, so that the gear 21 meshes with the pinion 23, and the gear 21 is driven by the drive source 6 through the pinion 23 as shown in FIG. It is rotated clockwise at . The guide rod 10 is pulled rearward by the excitation of the solenoid 8, and its bent portion 10a catches the bent portion 7c of the guide plate 7, causing the guide plate 7 to rotate against the elasticity of the spring 31. However, since the excitation of the solenoid 8 is instantaneous, the guide rod 10 returns to its current state just by momentarily touching the bent portion 7c of the guide plate 7. Gear 21 above
The assist cam 5 is also rotationally driven by the rotational drive of the assist cam 5, and the cam edge pushes the pin 4b to rotate the assist lever 4 counterclockwise in FIG. Push the bent portion 3b to slide the sliding plate 3 backward.
As the sliding plate 3 slides, the pins 3a, 3a move rearward, and the head board 2 fitted on the pins 3a, 3a is moved rearward. As the head board 2 moves, the pins 2a and 2a also move, but due to the elasticity of the spring 15, the head board 2
Since the pins 2a and 2a are urged to move downward, the pins 2a and 2a fall while being guided by the grooves 13c and 14c on the lower side of the guide grooves 13 and 14, and thus the magnetic heads 16 and 17 move downward. The pinch roller 18 contacts the tape of cassette B and presses the tape of cassette B against the capstan shaft. When the gear 21 rotates approximately half a turn and the pin 4b of the assist lever 4 hits the maximum diameter part of the assist cam 5, pushing the head board 2 to its limit position, the pin 2a hits the contact piece of the detection switch 42. Then, the switch 42 is turned on, thereby driving the reel stand and capstan shaft and supplying power to the reproduction amplifier circuit, etc., so that the message previously recorded on the cassette tape B is reproduced and transmitted to the other party. When the pin 4b of the assist lever 4 hits the maximum diameter part of the assist cam 5, the gear 2
The toothless portion 21a of the gear 21 faces the pinion 23, and the pin 21c of the gear 21 hits the end of one arm of the control rod 9, which has returned to its original state due to the elasticity of the spring 25.
1 is prevented from rotating, and the reproducing operation of the cassette B is maintained. In addition, in this state, one of the two pins 26, 26 of the gear 21 is connected to the spring 27.
5, the gear 21 is urged to rotate clockwise in FIG. 5, but the rotation of the gear 21 is prevented by the control rod 9 as described above.

When the reproduction of the reproduction cassette B is completed, a signal of intermediate length is outputted from the control circuit and applied to the solenoid 8. As a result, the solenoid 8 is energized, and as described above, the control rod 9 is rotated so that its one arm end escapes from the rotation path of the pin 21c of the gear 21, and the gear 21 is rotated by the biasing force of the spring 27. . The excitation time of the solenoid 8 is set to the time required for the pin 21c of the gear 21 and another pin 21d adjacent thereto to pass through the position of the end of one arm of the control rod 9. and the gear 21 are engaged again, and the gear 21 is rotationally driven. When the gear 21 rotates approximately half a turn, its toothless portion 21
a opposes the pinion 23 and the rotational drive stops,
Return to original position. The assist cam 5 rotates together with the gear 21, and the assist cam 5 and the assist lever 4 return to their original positions, and the head board 2 also returns to its original position as shown in FIG. Since the switch 42 is turned off at the beginning of this return operation, the reproduction operation is stopped at that point. Subsequently, a long signal is output from the control circuit and the solenoid 8 is energized for a relatively long time. The guide rod 10 is pulled due to the excitation of the solenoid 8, and the bent portion 10a of the guide rod 10 is pulled.
pushes the bent portion 7c of the guide plate 7 backward, causing the guide plate 7 to rotate counterclockwise in FIG.
As the guide plate 7 rotates, its one arm end 7a pushes up the head board 2 against the elasticity of the spring 15. On the other hand, due to the excitation of the solenoid 8, the control rod 9 escapes from the pin 21b of the gear 21, the gear 21 meshes with the pinion 23, and the assist cam 5 is rotated together with the gear 21.
The rotation of the assist cam 5 causes the assist lever 4 to rotate, thereby pushing the head board 2 backward. Here, the solenoid 8 is energized for a relatively long time, during which the head board 2 is pushed up as described above, so the head board 2 is pushed backward in this state.
Therefore, the pins 2a, 2a of the head board 2 are pushed up toward the grooves 13b, 14b on the upper sides of the guide grooves 13, 14. In this way, the head board 2 is pushed upward while being pushed backward, and the magnetic heads 16 and 17 come into contact with the tape of the upper cassette A, and the pinch roller 18
Press the tape from cassette A onto the capstan shaft. Further, the pins 2a, 2a are connected to the groove portion 13.
b, 14b turns on the switch 41, drives the reel stand and capstan shaft, and supplies power to the recording amplifier circuit, etc., and records the message from the other party in the cassette A. Note that when the gear 21 rotates approximately half a turn as in the case of regeneration described above, its toothless portion 21a faces the pinion 23, and at that point the solenoid 8 is demagnetized, so that the control rod 9 returns to its original position. The pin 21c of the gear 21 comes into contact with the end of one arm, preventing the gear 21 from rotating and maintaining the recording operation. As is clear from the above operation, the excitation of the solenoid 8 when switching to the recording mode is such that at least the pin 2a of the head board 2 is connected to the guide groove 13,
This means that the movement must be continued while moving from the front grooves 13a, 14a to the upper grooves 13b, 14b.

When the recording operation is completed, a signal with an intermediate length is output from the control circuit, which excites the solenoid 8, and as described above, the gear 21 and the assist cam 5 rotate approximately half a turn, and the head board 2 returns to its original position. to complete the series of operations. Furthermore, the switch 41 is turned off due to the return of the head board 2.

Note that the queue mode or review mode may be used to quickly search the contents recorded on the tape. In the above embodiment, when the head board 2 is pushed in the most, that is, when the pin 21c of the gear 21 is in contact with the end of one arm of the control rod 9, the solenoid 8 is momentarily activated by a short signal from the control circuit. This is done by being excited by the That is, when the solenoid 8 is momentarily energized while the pin 21c of the gear 21 is in contact with the control rod 9, the end of one arm of the control rod 9 momentarily escapes from the pin 21c and the gear 21 is slightly Immediately after allowing a certain amount of rotation, the solenoid 8 and the control rod 9 return to their original positions, and the pin 21d of the gear 21 moves to the control rod 9.
Rotation of the gear 21 is prevented by hitting the end of one arm of the gear. Since this slight rotation of the gear 21 is performed within the range of the toothless portion 21a, the gear 21 cannot mesh with the pinion 23. However, due to the slight rotation of the gear 21, the assist cam 5 also rotates slightly.
The assist lever 4 is slightly rotated by the biasing force of the spring 20, and the head board 2 is also slightly moved toward the front, so that the magnetic head is brought into a state in which it is in light contact with the tape. In this state, the reel stand is driven to rotate at high speed and the tape is transported at high speed, so that the signals recorded on the tape are reproduced at high speed, thereby making it possible to quickly search for a necessary recorded portion. When returning to the original position from the queue mode or the review mode, the solenoid 8 may be excited by a signal of intermediate length.

By the way, since the guide rod 10 passes through the bent portion 7d of the guide plate 7, when the head board 2 is pulled down to play the cassette tape B and the guide plate 7 is pushed down by the head board 2, , the guide plate 7 as shown in FIG.
The guide rod 10 is pushed down by the bent portion 7d of the guide plate 7, and the bent portion 10a is moved below the bent portion 7c of the guide plate 7. In this state, for example, a stop, queue, or review operation is performed. Even if the solenoid 8 is excited and the guide rod 10 is attracted, the bent portion 10a of the guide rod 10 does not come into contact with the bent portion 7c of the guide plate 7, and unnecessary force is applied to the guide plate 7. Never.

According to the present invention, a tape recorder in which a recording cassette and a playback cassette are stacked in two tiers is equipped with a magnetic head and a pinch roller, instead of moving the cassette tapes in two tiers as in the past. Since recording and playback can be performed selectively by moving the head board, less space is required to move the parts needed to switch between recording and playback, reducing the overall size and footprint. It is possible to provide a head substrate drive mechanism that can perform the following functions. In addition, in order to move two stacked cassette tapes while maintaining a predetermined position as in the past, a complicated positioning mechanism is required.
Since the present invention switches between recording and reproducing by moving the head board, it has the advantage of being relatively simple in construction.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the present invention, Fig. 2 is a side view of the same, Fig. 3 is an oblique view of the above, and Fig. 4 is an exploded oblique view showing the head board and guide groove portion of the embodiment of the above. , FIG. 5 is a perspective view showing the configuration of the main parts of the above embodiment, FIG. 6 is a side view showing the vertical guide mechanism of the head board of the above embodiment, and FIG. 7 is a separate view of the same guide mechanism. Fig. 8 is a side view showing the operating mode according to Fig. 6, Fig. 8 is a perspective view of the cassette holding mechanism used in the above embodiment, Fig. 9 is a side view of the same holding mechanism, and Fig. 10 is Side view showing another operating mode of the holding mechanism as above according to FIG. 9, No. 1
Figure 1 shows still another operating mode of the above holding mechanism.
It is a side view shown according to a figure. A... Recording cassette, B... Playback cassette, 2... Head board, 4... Assist lever,
5... Assist cam, 13, 14... Guide groove,
16, 17...Magnetic head, 18...Pinch roller.

Claims (1)

[Scope of utility model registration request] In a tape recorder in which a recording cassette and a reproducing cassette are stacked in two stages, a head board is fitted into the upper and lower guide grooves, and the head board is moved back and forth by an assist cam. A head board drive mechanism characterized in that a switching mechanism is provided below for causing the head board to enter either the upper or lower side of the bifurcated guide groove in response to a selection signal.