JPH0535461Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention relates to an idler switching mechanism for a cassette tape recorder, and is particularly used for idler switching in a reverse head type cassette tape recorder that is driven by a single motor. This paper relates to an optimal idler switching mechanism.

(Prior art) In conventional cassette tape recorders, multiple motors are used as drive sources, and multiple plunger solenoids are used as operating mode switching mechanisms to electrically switch between play (PLAY) and fast forward (F/F). , rewind (REW), cue, review, etc.

On the other hand, in recent years, reverse-head cassette tape recorders have become mainstream, and in this type of equipment, forward side play, cue, review, pause and reverse side play, cue, The robot must perform actions corresponding to each operation such as review and pause.

(Problems to be solved by the invention) The above-mentioned conventional cassette tape recorder uses multiple motors as drive sources, which increases costs. Since this is a device that has to be operated, it must be driven by a large-capacity plunger, which has disadvantages such as high power consumption and increased operating noise. In addition, especially in the head reversing type, the mechanism is complicated and large, and the operability is not good.

In order to eliminate the above-mentioned drawbacks of the conventional device, the inventor of the present invention has proposed that it can be driven by a single motor, and that a single control cam gear can perform play, cue, review, pause on the forward side, and play, cue, review, and pause on the reverse side. Although an operating mode setting mechanism for a cassette tape recorder capable of setting various operating modes such as pause has been proposed separately, the object of the present invention is to provide an idler switching mechanism related to such an operating mode setting mechanism.

(Means for Solving the Problems) The idler switching mechanism of the cassette tape recorder according to the present invention is equipped with a control cam gear that meshes with a drive gear and rotates by an operation action, and a magnetic head. a slide base whose forward or backward movement is controlled by a push-out cam provided on the cam gear; and a direction arm that has an engaging portion that engages with a cam portion formed on the cam gear and swings as the cam gear rotates. a trigger lever that swings to control the rotation of the control cam gear and also controls the swing of the direction arm; and a trigger lever that is activated by an operation mode setting operation to swing the trigger lever at a predetermined timing. a solenoid which is configured to hold the swing position for a predetermined period of time depending on the operating mode;
a direction slider that is engaged with one end of the direction arm and slid by the swinging of the direction arm, and the direction arm is formed on the cam gear to set each operation mode. A tape recorder configured to set each operation mode of forward play, cue, review, stop, and reverse play, cue, review, and stop by selectively engaging a cam portion of the tape recorder. And,
The slide base has an engagement pin that engages with a cam groove formed in the direction arm, and swings the idler component whose swing is controlled by the swing of the direction arm. The idler is held movably and is configured to switch and operate the idler depending on the state of engagement between the engagement pin and the cam groove in accordance with each of the operation modes.

(Function) When a solenoid is actuated by an operation action on a rotating drive gear such as a wheel gear arranged coaxially with the flywheel, a trigger is given to the control cam gear via the trigger lever, and the control cam gear is activated. The cam gear starts rotating by meshing with a rotating drive gear such as a capstan wheel. The cam gear has a cam part that performs various controls,
The direction arm swings as the cam gear rotates, and the magnetic head, pinch roller, etc. can be set to a predetermined operating state by the rotation of the cam gear. There is a cam part that moves the slide base mounted on the head forward against its elastic force by its rotation, and the head can be advanced to the cue, review, and even play positions. An engagement groove is formed in the direction arm, and the idler component, which is swingably held on the slide base, has an engagement pin that engages with the engagement groove. Depending on the state of engagement between the engagement pin and the engagement groove whose position changes as the direction arm swings, forward play, cue, review, stop, and reverse play are possible.
The idler component swings to correspond to operations such as queue, review, and stop, and the idler gear is switched to a predetermined state. In addition, fast forward (F・
Of course, it is also possible to perform F) and rewind (REW).

(Embodiment) An embodiment of the idler switching mechanism for a cassette tape recorder according to the present invention will be described based on the drawings.

Figure 1 is a diagram showing the overall layout, viewed from the loading side of the cassette tape, and details of the chassis and other parts are omitted to simplify the diagram. .

Figure 2 is a plan view showing only the drive source relationship, Figure 3 is a plan view showing the relationship between the reel stand and idler, and Figure 4 is the relationship between the drive gear, control cam gear, direction arm, etc. FIG. Note that FIGS. 1 to 4 all show the forward stop state.

FIGS. 5A and 5B are perspective views showing the control cam gear, with A being a perspective view as seen from the top side, and FIG. 5B being a perspective view seeing from the bottom side.

Figure 6 is a perspective view of the direction arm, Figure 7 is a perspective view of the direction arm.
The figure is a plan view showing the engaged state of the direction arm and the direction slider, Figure 8 is a rear view showing the head reversing mechanism, and Figure 9 is a plane view showing the relationship between the direction slider and the pinch roller. 10 is a rear perspective view of the idler component, FIG. 11 is a plan view showing the fast forward and rewind switching mechanism, and FIGS. 12 to 15 show the relationship between the control cam gear and direction arm. FIG. 12 shows the forward stop position at the first
Figure 3 shows the reverse stop position.

Fig. 14 is a plan view showing the reversal area of the head from forward to reverse, and Figs. 15 A to F are plan views showing the engagement positional relationship between the control cam gear and the engagement portion (pin) of the direction arm. and
A is the forward stop position, B is the forward play position, C is the forward cue position, D
indicates the reverse stop position, E indicates the reverse play position, and F indicates the reverse cue position.

16A to 16C are plan views showing the relationship between the control cam gear and the trigger lever, A shows the stop position for both forward and reverse, B shows the play position for both forward and reverse, and C shows the play position for both forward and reverse.
indicates the positional relationship of forward and reverse queues and reviews, respectively.

17A to 17D are plan views showing the positional relationship between the idler component and the direction arm;
indicates the positional relationship between the forward stop and play, B indicates the reverse stop and play position, C indicates the positional relationship between the forward queue and review, and D indicates the positional relationship between the reverse queue and review. .

FIG. 18 is a chart showing the operation timing of the first solenoid or the second solenoid accompanying each operation.

The basic structure of the idler switching mechanism of the cassette tape recorder according to the present invention includes a control cam gear 17 that meshes with and rotates the drive gear 16 by an operating action, and a magnetic head 25 mounted on the cam gear 17. Extrusion cam 186 provided
A slide base 15 whose forward or backward movement is controlled by
A direction arm 20 has engagement pins 21 and 22 that engage with the control cam gear 17 and swings as the cam gear rotates. Trigger lever 7 that controls the swinging of the lexion arm 20
, a solenoid 5 which is actuated by an operation mode setting operation to swing the trigger lever 7 at a predetermined timing and maintain the swing position for a predetermined time depending on the operation mode; and the direction arm 20 and a direction slider 25 that is engaged with one end 23 and slides by the swinging of the direction arm 20, and the direction arm 20 is formed in the cam gear 17 in each operation mode. By selectively engaging the setting cam parts 181 to 185,
The tape recorder is configured to have play, cue, review, and stop modes on the forward side and play, cue, review, and stop on the reverse side. Shion arm 2
The idler component 14 has engaging pins 360, 380, 382 that engage with cam grooves 201 formed at 0, and whose swing is controlled by the swing of the direction arm 20. It is held so as to be able to swing freely, and is configured to perform operations corresponding to each of the operation modes described above depending on the state of engagement between the engagement pins 360, 382 and the cam groove 201.

Next, the specific configuration will be described, starting with the overall configuration related to the idler switching mechanism.

First, to explain the drive source system, the first flywheel 1 and the second flywheel 2 are rotated by a motor 3 via a belt 4 that is stretched around the outer peripheral surface thereof in a substantially "S" shape. 1a and 2a each indicate a capstan. Reference numeral 5 designates a first solenoid, and its plunger 50 engages with the rear end of the trigger lever 7, which rotates about a shaft 70. As will be described in detail later, the trigger lever 7 is activated in response to an operation mode switching operation. 7. Reference numeral 6 denotes a second solenoid, and its plunger 60 engages with the rear end of a substantially "Y"-shaped switching lever 8 that rotates around a shaft 80, and swings the switching lever 8. This allows fast forward (F/F) and rewind (REW) mode switching.

As shown in FIG. 2, a switching drive gear 9 for switching and driving the take-up reel stand 11 and the unwind reel stand 12 in the forward state is supported by a holding block 91 that swings about a shaft 90. , a pulley 92 is disposed coaxially with the belt 10, and the belt 10 is suspended between the pulley 1b and the pulley 1b coaxially disposed with the first flywheel 1.
driven by. In addition, the take-up reel stand 11
rotates via the intermediate gear 13, but the switching drive gear 9 is always biased in the direction of meshing with the intermediate gear 13 (in the direction of arrow 9F). FIG. 3 shows the relationship between the idler component 14 and the switching drive gear 9, etc., and the idler component 14 is connected to the first
As will be explained later based on FIG. 0, they are arranged to be swingable with a slide base 15 in between. A magnetic head 26 is mounted on the slide base 15 and is always urged in a backward direction (downward in FIGS. 1 and 3) by a spring (not shown).
is made to come into contact with the tape and move back to separate from the tape.

As clearly shown in FIG. 4, the control cam gear 17 is rotated by the drive gear 16 coaxially provided on the first flywheel 1, but the control cam gear 17 has a toothless shape. In addition, as shown in FIG. 5, cam portions 18 and 19 are provided on the upper and lower surfaces.
are formed respectively. To specifically explain the configuration of the cam portion of this control cam gear 17, the control cam gear 17 is molded from engineering plastic, and the cam portion 18 on the upper surface side is approximately semicircular with the shaft 170 as the center. A cam 181 formed in the shape of a cam 181, a cam 182 shaped like a “dog” and continuously formed at one end of the cam 182 and slightly higher than the cam 181, a block cam 183 shaped like a trapezoid, An arcuate cam 184 located on the outer periphery and an arcuate cam 185 lower than this
and an extrusion cam 186 formed at the tip of the shaft 170, and by rotation of the extrusion cam, the cut and raised portion 1 of the slide base 15 is
By pushing 52, the slide base is moved forward against the elastic force. In addition, 1
Reference numeral 87 is a hole formed to correspond to the push-out cam 186, and the block cam 183 is formed at the edge of the hole. Further, the cam portion 19 on the lower surface side has two stopper cams 191, 192 formed at a predetermined interval on the outer periphery, and two stopper cams 191, 192 formed from the shaft 170 to the stopper cams 191, 192.
A substantially rectangular block cam 193 extending between
and "L" shaped cam 1 formed on the opposite side.
It consists of 94. Incidentally, an engagement pin 71 formed on the trigger lever 7 is adapted to engage with the cam portion 19 on the lower surface side, and the relationship between these will be explained later based on FIG. 16.

Reference numeral 20 denotes a direction arm that rotates around a shaft 200 and is biased clockwise by a coil spring 20a.As shown in FIG. At the same time, a bifurcated groove 201 serving as an engagement groove is formed on the other end side. Further, a side wall portion 202 is formed on the side of the bifurcated groove 201, and an “L”-shaped locking piece 203 is formed downward from the side edge of the bearing portion. A low engagement pin 21 and a high engagement pin 22 protrude downward near the outer edge of the central bent portion, respectively, so as to engage with the cam portion 18 on the upper surface side of the side cam gear 17. The one end 23 can be moved between four positions by swinging by the rotation of the control cam gear 17. Note that these relationships will be explained later based on FIGS. 12 to 15.

In FIGS. 1 and 4, 24 is a switching cam gear formed in a toothless shape, and is connected to the drive gear 1.
6 and is driven to perform switching between fast forward (FF) and rewind (REW), the specific configuration of which will be explained later based on FIG. 11.

Direction slider 2 arranged so as to be able to slide on the chassis as shown in Fig. 7
An engagement groove 250 is formed on the bottom side of 5,
One end 2 of the direction arm 20 is attached to this.
The engagement pin 231 of No. 3 is engaged with the one end portion 23.
The direction slider 25 is adapted to slide as the direction slider 25 moves four positions. 8th
As shown in the figure, a head mounting block 27 is fixed to the slide base 15, and a magnetic head 26 is attached to this so as to be reversible by a reversing mechanism 28. This reversing mechanism rotates a gear 280 that meshes with a gear fixed to the rotating shaft of the magnetic head 26 via a lever 281 formed as a part thereof, so that the magnetic head is reversed in a click-like manner by a spring 282. However, the lever 281 engages with an engagement hole 29 formed approximately in the center of the direction slider 25, so that the magnetic head 26 is reversed by the slide of the direction slider 25. It is composed of

Numerals 30 and 31 shown in FIG. 9 are pinch roller mechanisms, 30 is the reverse side, 31 is the forward side, and pinch rollers 32 and 33 are pinch arms that are supported by the chassis and rotate about shafts 300 and 310 as fulcrums. A coil spring 304 is inserted into the spring attachment bosses 303 and 313 provided on the pinch arms 301 and 311, respectively, and one end of the coil spring 304 is locked near the base of the pinch arms 301 and 311. and an engaging portion 15 whose other end is provided on the slide base 15.
3, and the pinch rollers 32, 33
The pinch arms 301, 311 are always biased in a direction to bring them into pressure contact with the capstans 1a, 2a, and the pinch arms 301, 311 are rotated as the slide base 15 moves forward or backward. Further, pins 302 and 312 are formed on the pinch arms 301 and 311, respectively, and are engaged with pinch roller control grooves 34 and 75 formed in the direction slider 25, respectively. Cut grooves 340 and 350 are formed in the pinch roller control grooves 34 and 35, respectively, for controlling whether or not the pinch roller is brought into pressure contact with the capstan.

FIG. 10 is a perspective view of the idler mechanism seen from the bottom side, and the idler gear 36 consists of two gears 361, 362 and an intermediate gear 37, which are overlapped with each other via a friction member such as felt so as to rotate in a slip manner. The two gears 361 and 362 are pivotally supported at one end of an idler plate 38 formed in a substantially "V" shape, and the intermediate gear 37 is pivotally supported at the other end. The gear 362 is the idler component 1
4 moves forward, the gear 361 meshes with the small diameter gear portion 94 provided on the drive gear 9, and the gear 361 meshes with the outer peripheral gear portion of the take-up reel stand 11 due to the swinging direction of the idler component 14, and the intermediate gear 37 meshes with the outer peripheral gear portion of the rewind reel stand 12. Further, the shaft pin 360 of the two gears 361, 362 is used as an engagement pin on the idler plate 38.
It protrudes downward from the back side.

A supporting piece 381 protrudes from the back side of the idler plate 38 at a predetermined height from the surface of the idler plate 38 at the bifurcated portion, and the base of the supporting piece 381, that is, the bifurcated portion A long engagement pin 380 is formed to protrude so as to be located at . Furthermore, a short engagement pin 382 is protruded from the middle portion of the support piece 381. Further, an engagement piece 383 is provided at a rear end of the back side of the idler plate 38 at a predetermined height from the surface of the idler plate 38.
is provided protrudingly, and the slide base 15 is arranged so as to be sandwiched between the surface of the idler plate 38, this engagement piece 383, and the support piece 381, and the engagement piece 383 slides as shown in FIG. Engagement piece 15 at the edge of the window hole 150 formed in the base 15
1, the idler component 14 is swingably held by the slide base 15, and the idler component 14 is always urged in the forward direction by a spring (not shown). It is held elastically.

Note that another pin 384 is formed at the base of this engaging piece 383 to engage with the edge of a window formed in the chassis. Further, the side wall portion 202 of the direction arm 20 has engagement pins 380, 382.
The engaging pin 382 and the shaft pin 360 are engaged with each other so as to be located between them.
01 by engaging the idler component 14.
is now subject to swing control. This relationship will be described later based on FIG. 17.

As shown in FIG. 11, the switching cam gear 24
A pressing cam 241 is formed on the upper surface, and a driving cam 242 and a stopper cam 24 are formed on the lower surface.
3 is formed, and a guide cam 244 extends from the shaft portion to the middle thereof, and is adapted to engage with a pin 82 projecting from one end portion 81 of the switching lever 8.

Reference numeral 39 denotes a slider that is slidably disposed on the underside of the chassis, and is always urged in the backward direction by a spring 43, and has a lever portion 40 on the rear end side and a pressing portion on the tip side. 41 are formed respectively, and the lever portion 40 engages with a pressing cam 241 formed on the switching cam gear 24, and when the lever portion 40 is pressed by the rotation of the switching cam gear 24, an elastic force is generated. We are moving forward against this. This slider 3
1 and 11 at the pressing part 41 by the forward movement of 9.
The brake plate 44 shown in the figure is moved forward against the resilient force to release the brakes on the reel stands 11 and 12. The brake plate 44 is PLAY
(FWD, RVS) and CUE, RVS (EWD,
RVS), the brake plate 44 is released by pushing up both left and right end surfaces of the brake plate 44 with the protrusions on the left and right upper ends of the slide base 15. This slider 39 has a substantially "Y"-shaped guide groove 42 formed on its back side, and an engagement pin 93 protruding from the tip of the holding block 91 is engaged in the guide groove 42. . The engagement pin 93 is connected to the guide groove 42.
The holding block 91 is oscillated depending on which side the holding block 91 is placed on, and the drive gear 9 is brought into mesh with the rewind reel stand 12 or the intermediate gear 13.

As shown in FIG. 11, the switching lever 8 is provided with a torsion coil spring 84 on its shaft, one end of which is extended and held by the holding portion 83, and can be engaged with the engagement pin 93. ing. That is, the switching lever 8 is always urged to rotate clockwise by the coil spring 45, and in the normal state, the torsion coil spring 8
The tip of 4 is away from the engagement pin 93,
Since the drive gear 9 is biased in the direction of the arrow 9F, when the slider 39 moves forward, the engagement pin 93 will enter the right side of the guide groove 42. When the slider 39 moves forward while being pulled, the torsion coil spring 84 contacts and presses the engagement pin 93, and the engagement pin 93 enters the left side of the guide groove 42.

Next, related mechanisms centering around the control cam gear 17 will be explained. In the explanation of the diagram, FWD is forward, RVS is reverse, CUE is cue, RVW is
indicates review, FF indicates first forward, and REW indicates rewind.

Figure 12 shows the location of FWD STOP.
The low engagement pin 21 and the high engagement pin 22 are located so as to straddle the arcuate cam 184. In this state, the engagement pin 231 protruding from one end 23 of the direction arm 20 is in the FWD STOP (PLAY) position, the direction slider 25 is in the position shown, and the pin of the FWD side pinch arm is in the FWD STOP (PLAY) position. 31
2 enters the cut groove 350, and the FWD side pinch roller is in contact with the capstan. FIG. 13 shows the RVS STOP (PRAY) position, where the engagement pins 21 and 22 are in the positions shown, and only the RVS side pinch roller is in contact with the capstan. FIG. 14 shows that the control cam gear 17 is in the 12th position.
It shows the region where the magnetic head reverses from FWD to RVS when rotating in the direction of arrow 17F from the state shown in the figure.

15A to 15F show the positional relationship between the cam portion 18 of the control cam gear 17 and the engagement pins 21, 22 of the direction arm 20 according to each operation as shown in the figures.

16A to 16C are diagrams showing the relationship between the cam portion 19 on the back side of the control cam gear 17 and the trigger lever 7, and are shown as seen through from the cassette tape loading side. Figure A shows both FWD and RVS STOP.
Figure B shows the PLAY position for both FWD RVS, and Figure C shows the CUE or RVW position for both FWD RVS. The trigger lever 7 is formed in a substantially dogleg shape, with three peaks formed on the tip side, and an engagement pin 71 formed on the innermost peak, and an engagement pin 71 continuously extending outward. Locking part 72,
73 are formed respectively. The above engagement pin 7
1 is adapted to engage with the cam portion 19, and the locking portions 72 and 73 are configured to hold the locking piece 203 of the direction arm 20, as will be explained later.

FIG. 17 is a diagram showing the relationship between the direction arm 20 and the idler component 14 (FIG. 10), and in the figure, the engagement relationship between the bifurcated groove 201, which is an engagement groove, and each pin of the idler component 14. It is shown as. Figure 17A is from FWD STOP to FWD
Showing the engagement relationship leading to PLAY, slide base 1
5, the shaft pin 360 and the engagement pin 38
0 moves in the direction of the arrow and reaches the position shown by the imaginary line. Therefore, the idler gear 36 as a whole is 36
It will operate in the direction shown by F1. Figure 17B shows the engagement relationship from RVS STOP to RVS PLAY, and the idler gear 36 as a whole is 36F.
It operates in the direction shown in 2. Figure 17C shows the positional relationship between CUE and RVW in FWD.
In this mode, the pin 384 engages with the edge of the window 100 formed in a convex shape on the chassis, so the entire idler does not move forward. Figure 17D is
It shows the positional relationship between CUE and RVW in RVS, and in this mode, the above-mentioned another engagement pin 382
Since the shaft pin 360 and the shaft pin 360 are locked in the position shown in the figure, the entire idler will not move forward.

Next, an example of operation will be explained.

The control cam gear 17 is set to rotate once at a predetermined speed, and the timing at which the first solenoid 5 or the second solenoid 6 should be operated in accordance with each operation is computer programmed. FIG. 18 is a timing chart of these, and in the figure, S1 indicates the first solenoid 5, and S2 indicates the second solenoid 6.

To explain the operation of FWD PLAY in FIGS. 15 and 16, the drive gear 16 is located at the first missing tooth 171 of the control cam gear 17 and rotates, but as shown in FIG. 18, When the first solenoid 5 (S1) is energized in a pulsed manner for a predetermined period of time from time 0, which is the STOP state, the engagement pin 71 of the trigger lever 7 hits the cam 193, thereby causing a small rotation start. The cam gear 17 meshes with the drive gear 16 and rotates approximately half a rotation, and the low engagement pin 21 moves while sliding on the inner surface of the cam 182. During this movement process, the first solenoid 5 is energized for a predetermined time as shown in FIG.
The locking portion 73 at the tip of the trigger lever 7 holds the locking piece 203 to prevent the direction arm 20 from rotating clockwise. This maintains the state in which the pin 312 of the forward side pinch arm corresponds to the cut groove 350 of the direction cylinder 25. In addition, the locking portion 73
Due to the hold of the locking piece 203, the high engagement pin 22 is located inside the cam 185, and the control cam gear 17 rotates clockwise from the initial position shown in FIG. By being located at the tooth 172, the state shown in FIG. 15B is achieved.At the same time, the cam 186 pushes up the cut and raised piece 152 of the slide base 15, thereby bringing the magnetic head 26 into contact with the tape, and setting the FWD PLAY state. be done. Note that due to the stop operation, the control cam gear 17 rotates a little, and the drive gear 16 rotates to the first position.
It is located at the missing tooth 171 and enters the STOP state as shown in FIG. 15A.

In the FWD CUE state shown in Fig. 15C, the setting at startup is almost the same as the setting for PLAY above, but as is clear from Fig. 18, during the above operation, the second energization is performed. Therefore, the engagement pin 22 passes through the outer surface of the cam 185, resulting in the state shown in FIG. 15C. In the case of this FWD CUE, the first solenoid 5 is then continuously energized while the control cam gear 17 is rotating, thereby holding it as shown in FIG. 16C. In addition,
In this state, the tip 74 of the trigger lever 7 is in the front side of the locking piece 203 (the upper side of the locking piece 203 in FIG. 4), and the cut grooves 340 and 350 of the direction slider 25 are both pinned. 302 and 312, the pinch roller cannot move forward, and the tape is not pressed by the pinch roller. Furthermore, the engagement between the cam 186 and the cut and raised piece 152 of the slide base 15 is
Although it is slightly lowered than during PLAY, the magnetic head 26 remains in contact with the tape even in this state and can detect (CUE) the magnetically recorded portion of the tape. The above-mentioned FWD CUE state is the same for FWD RVW, and the switching cam gear 24 is operated by the operation of the second solenoid 6 (S2) to switch between FF (fast forward) and REW (rewind). It is only set.

FIG. 15E shows the position of RVS PLAY. For example, in order to set from the FWD PLAY state in FIG. 15 to this RVS PLAY state, the position shown in FIG. As shown in the figure, the control cam gear 17 rotates clockwise, and the slide base 15 is lowered once by the cam 136 that engages with the cut-and-raised piece 152 of the slide base 15, thereby lowering the pinch roller 31 and the pinch arm 311. The pin 312 is disengaged from the cut groove 350, and the direction slider 25 is free to slide left and right.Then, the direction arm 20 swings greatly about the shaft 200, and the direction is adjusted. slider 25
slides to the right in FIG. 12, and the magnetic head is reversed within the area shown in the figure to become RVS. As in FWD PLAY, the magnetic head 26 comes into contact with the tape, and as shown in Figure 15E.
Enters RVS PLAY state. During this process, the engagement pin 21 is low and can freely pass over the cam 183. Even in this state, the control cam gear 17 rotates slightly due to the STOP operation, resulting in the STOP state shown in FIG. 15D.

To change from the RVS STOP state shown in Fig. 15D to the RVS PLAY state shown in Fig. 15E, energize the first solenoid (S1) at a predetermined timing from the 0 time point, which is the STOP state shown in Fig. 18. The control cam gear 17 rotates approximately one revolution and enters the state shown in FIG. 15E. In RVS CUE, the first solenoid (S1) is activated at the predetermined timing shown in FIG.
The state shown in FIG. 15F is set by energizing RVS, and this state is the same for RVS and RVW. Furthermore, the relationship between the trigger lever 7 and the cam portion 19 is the same as in the case of FWD described above, but
In the RVS CUE and RVS RVW, the locking piece 203 is locked and held on the locking portion 72 side of the trigger lever 7.

In the above operation, even if the slide base 15 moves forward, the idler structure 14 does not move forward or moves forward depending on the engagement state of the pin 384 of the idler structure 14, and when the slide base 15 moves forward, the gear 362 shifts to the drive gear 9. In the state where the cam grooves 201 are engaged with each other, the position of the cam groove 201 changes as the direction arm 20 swings, so the engagement pins 360, 380, 3
82 and the cam groove 201, the idler component 14 swings and the gear 361 engages or disengages with the take-up reel stand 11, or the intermediate gear 37 engages with the take-up reel stand 12. The idler is engaged or not engaged to perform idler switching operations corresponding to each operating mode.

In addition, as shown in FIG. 18, in FF and REW, the first solenoid 5 (S1) and therefore the control cam gear 17 do not function, and are switched by energizing the second solenoid 6 (S2). cam gear 24
This is done by operating the .

(Effect of the invention) According to the idler switching mechanism of the cassette tape recorder according to the invention, the solenoid is actuated by the operation action on the rotating drive gear such as the wheel gear disposed coaxially with the flywheel. Then, a trigger is applied via the trigger lever, and the control cam gear engages with a rotating drive gear such as a capstan wheel and starts rotating. The cam gear has a cam portion that performs various controls, and the rotation of the cam gear causes the direction arm to swing, allowing the magnetic head, pinch roller, etc. to be set in a predetermined operating state.

An engagement groove is formed in the direction arm, and an idler component is swingably held on the slide base on which the magnetic head is mounted. Since it has an engagement pin that engages with the engagement groove, forward side play is caused by the engagement state between the engagement pin and the engagement groove whose position changes as the direction arm swings. The idler gear can be switched to a predetermined state by driving the idler component to correspond to operations such as , cue, review, stop, reverse side play, cue, review, and stop. Note that it is of course possible to perform fast forwarding (FF) and rewinding (REW).

In this way, the idler switching mechanism in a one-motor type cassette tape recorder with a reversing head type mechanism can be used to perform switching corresponding to each operating mode, simplifying the mechanism and reducing costs. There is an effect that can be done.

[Brief explanation of the drawing]

The drawings show an embodiment of the idler switching mechanism for a cassette tape recorder according to the present invention, and FIG. , details of the chassis and various parts are omitted to simplify the drawing. Figure 2 is a plan view showing only the drive source relationship, Figure 3 is a plan view showing the relationship between the reel stand and idler, and Figure 4 is the relationship between the drive gear, control cam gear, direction arm, etc. FIG. Note that FIGS. 1 to 4 all show the forward stop state. Fifth
Figures A and B are perspective views showing control cam gears;
A is a perspective view as seen from the top side, and B is a perspective view as seen from the bottom side. Fig. 6 is a perspective view of the direction arm, Fig. 7 is a plan view showing the engaged state of the direction arm and the direction slider, Fig. 8 is a rear view showing the head reversing mechanism, Fig. 9 is a plan view showing the relationship between the direction slider and the pinch roller, FIG. 10 is a rear perspective view of the idler component, FIG. 11 is a plan view showing the fast forward and rewind switching mechanism, and FIGS. FIG. 15 is a plan view showing the relationship between the control cam gear and the direction arm, FIG. 12 showing the forward stop position, and FIG. 13 showing the reverse stop position. Fig. 14 is a plan view showing the reversal area of the head from forward to reverse, and Figs. 15 A to F are plan views showing the engagement positional relationship between the control cam gear and the engagement portion (pin) of the direction arm. where A is the forward stop position, B is the forward play position, C is the forward cue position, D is the reverse stop position, E is the reverse play position, and F is the reverse cue position. There is. Figure 16A
Figures 1 through C are plan views showing the relationship between the control cam gear and the trigger lever; A shows the stop position for both forward and reverse; B shows the play position for both forward and reverse; and C shows the forward and reverse cue position. and the positional relationship of the reviews. 17A to 17D are plan views showing the positional relationship between the idler component and the direction arm, A shows the forward stop and play positional relationship, B shows the reverse stop and play positional relationship, and C indicates the positional relationship between forward queues and reviews, and D indicates the positional relationship between reverse queues and reviews. FIG. 18 is an operation timing chart of the first solenoid or the second solenoid accompanying each operation. 3... Motor, 5... First solenoid, 6
...Second solenoid, 7...Trigger lever, 8
...Switching lever, 9...Drive gear, 14...Idler component, 15...Slide base, 16...
...Drive gear, 17...Control cam gear, 18,1
9...Cam part, 20...Direction arm,
21, 22...Engaging pin, 24...Switching cam gear, 25...Direction slider, 26...
...Magnetic head, 28...Head reversal mechanism, 201
...Bifurcated groove as an engagement groove, 360... Axis pin as an engagement pin, 380, 382, 383... Engagement pin.

Claims (1)

[Scope of utility model registration request] A control cam gear that meshes with a drive gear and rotates by an operating action; a slide base that is equipped with a magnetic head and whose forward or backward movement is controlled by a push-out cam provided on the cam gear;
a direction arm that has an engaging part that engages with a cam part formed on the cam gear and swings as the cam gear rotates; and a direction arm that swings to control the rotation of the control cam gear; A trigger lever that controls the swinging of the direction arm, and a trigger lever that is actuated by an operation mode setting operation to swing the trigger lever at a predetermined timing and maintain the swinging position for a predetermined time depending on the operation mode. and a direction slider that is engaged with one end of the direction arm and slides as the direction arm swings, and the direction arm is formed on the cam gear. By selectively engaging the cam portion for setting each operation mode, forward play, queue, review,
The tape recorder is configured so that play, queue, review, and stop operation modes can be set on the stop and reverse sides, and the slide base has a cam groove that engages with a cam groove formed in the direction arm. An idler component having a mating engagement pin whose swing is controlled by the swing of the direction arm is held swingably, and the engagement pin and the cam groove are engaged with each other. An idler switching mechanism for a cassette tape recorder, characterized in that the idler switching mechanism is configured to switch and operate the idler corresponding to each of the above-mentioned operation modes.