JPH10172200A - Magnetic head operation position maintaining mechanism for tape recorder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a simply structured and reasonably priced tape recorder lever operating mechanism for maintaining, in its forward position, a head chassis carrying a magnetic head and moving forward/backward with respect to a magnetic tape. SOLUTION: The ends of middle levers 80 and 81 are pushed by a head chassis driving swing lever 71 to be swung, the ends are engaged with recessed parts formed in the head chassis driving swing lever in the forward limit position of a head chassis, and then the head chassis is maintained in its forward position by the relationship of the engagement and a relationship between the pressing forces of a head chassis pressing spring and a spring provided in a pinch lever. Simultaneously, the pinch lever is maintained in a pushed state, or in a state where a pinch roller is in contact with capstans 21 and 23, by the other ends of the middle levers 80 and 81 positioned in sides opposite the ends with the center point of the swing rotation motions of the middle levers 80 and 81 placed therebetween and, by a simple and low-cost structure where only a plurality of levers are combined together, the head chassis and the pinch lever are displaced and held in their displaced positions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head advance position maintaining mechanism for a tape recorder, and more particularly, to a mechanical structure for maintaining a head chassis which carries a magnetic head and advances and retracts with respect to a magnetic tape at an advance position. It is about.

[0002]

2. Description of the Related Art The operation modes of a conventional small tape recorder include the following. Normal playback (forward playback, reverse playback): The magnetic tape is run at a constant speed (run at low speed), and the recorded signal is played. Automatic reversal: The end of the magnetic tape being reproduced is detected and the running direction is reversed. Manual reversal: The operator manually reverses the tape running direction as needed. High-speed reproduction: The magnetic tape runs at a high speed while reproducing the recording signal of the magnetic tape (commonly referred to as cue, review or inter-track detection). Winding and fast-forwarding: The magnetic head is separated from the magnetic tape, and the magnetic tape is wound at a high speed in the forward or backward direction. Others: Auto stop, etc. For example, Japanese Patent Laid-Open No. 7-326094 has proposed a small-sized tape recorder in which the operation mode is switched by an electronic control method by operating a light contact button.

[0003]

When such an operation mode is switched by an electronic control method by operating a light contact button (feather touch), an electromagnetic plunger for moving various levers is required, and the mechanism becomes complicated. However, there are disadvantages that the assemblability is complicated and the production cost is high.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a simple and inexpensive lever operating mechanism in which the operation mode is switched electronically by operating a light contact button. This object is achieved by employing a magnetic head operating position maintaining mechanism of a tape recorder having the following features. A head chassis that carries a magnetic head and is displaced between an advanced position where the magnetic head contacts the magnetic tape and a retracted position where the magnetic head separates from the magnetic tape; and a head chassis that is displaced from the retracted position to the advanced position. A swing lever for driving the head chassis, an urging spring for constantly urging the head chassis in the backward direction, a first position for supporting the pinch roller, and bringing the pinch roller into contact with the capstan; A pinch lever that swings between a second position away from the stan, a driving force transmitting spring member that elastically presses the pinch lever, a head chassis driving oscillating lever, and a driving force transmitting spring member And an intermediate lever interposed between the head chassis and the transmission lever to transmit the driving force from the former to the latter. When the chassis is moved from the retracted position to the advanced position, one end of the intermediate lever is pushed by the swing lever for driving the head chassis and swings, and the swing lever for driving the head chassis is moved to the forward limit position of the head chassis. The head chassis is maintained at the forward position by the relationship between the engagement and the biasing force of the biasing spring and the driving force transmitting spring member. A state in which the pinch lever is pushed by the other end of the intermediate lever located on the opposite side to the one end with respect to the center point of the swinging rotational movement of the lever, that is, the pinch roller is in the first position and is located on the capstan. A magnetic head operating position maintaining mechanism adapted to be maintained in contact. In the magnetic head operating position maintaining mechanism, in response to a switch operation for selecting each operation mode, the drive motor rotates forward and backward, and each operation such as normal rotation reproduction, reverse rotation reproduction, normal rotation fast forward, and reverse rotation fast forward is performed. A tape recorder of the type, wherein a pair of pinch levers each carrying the pinch roller, and a pair of pinch levers interposed between a swing lever for driving a head chassis and each of the pinch levers and engaged with both members, respectively. And the intermediate lever of the present invention. Hereinafter, one embodiment of the present invention will be described.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In this embodiment, a motor is rotated forward and reverse by electronic control in response to a switch operation for selecting each operation mode, so that forward rotation reproduction, reverse rotation reproduction, normal rotation fast forward, reverse rotation fast forward and the like are performed. The present invention relates to a tape recorder in which each operation is performed. Description of Drive Mechanism FIG. 1 is a schematic view of a drive mechanism 20 of a tape recorder as viewed from a side (back side) opposite to a tape cassette mounting side (referred to as a front side). Chassis 10 on which drive mechanism 20 is mounted
The inside of the cabinet (exterior box) of the tape recorder is divided into a front side and a rear side, a drive mechanism 20 is arranged on the rear side, a magnetic head is mounted on the front side on which the tape cassette is loaded, and the chassis 10 is mounted on the rear side. A pair of capstans that penetrate and protrude to the front side, a pair of pinch rollers that respectively contact and separate from the capstan, a pair of reel claws, and the like are provided.

The driving mechanism 20 has a motor M that can rotate forward and reverse as a driving source, and the driving rotational force of the motor M is applied to the first capstan pulley 21A, the guide pulley 22, the second capstan pulley 23A, and these components. The transmission is transmitted to the gear train by the wound drive belt 24. The guide pulley 23 integrally has a drive gear 25 on the lower side facing the chassis 10. That is, the second capstan pulley 23A and the driving gear 25 cannot rotate relative to each other. The drive gear 25 meshes with an intermediate gear 26 that is a reduction gear, and the intermediate gear 26 meshes with a large gear 27 that is a reduction gear. Each of the intermediate gear 26 and the large gear 27 is rotatably supported by a support shaft erected on the chassis 10. Large gear 27 located approximately in the center of chassis 10
Has a main gear 28 having a diameter smaller than that of the large gear 27 integrally below the chassis 10. That is, the large gear 27 and the main gear 28 cannot rotate relative to each other.

The main gear 28 has a sub gear 2 as a reduction gear.
The sub gear 29 can revolve around the main gear 28 while always meshing with the main gear 28. That is, the main gear 28 functions as a sun gear, and the sub gear 29 functions as a planetary gear. The sub gear 29 is the main gear 2
8 and is rotatably supported by an arm 34 of a rotating body 31 with an arm rotatably supported by a support shaft 30 in a coaxial relationship with the arm 8.
When the sub gear 29 is at the neutral position between the first operation mode switching control member 60 with partial gear teeth and the second operation mode switching control member 61 with partial gear teeth, the sub gear 29 meshes and An engagement projection 10A for preventing the 29 from floating is provided on the chassis 10 adjacent to the revolving orbit of the auxiliary gear 29. The rotating body with arms 31 includes a circular substrate 32, a sector-shaped flange 33 extending radially outward from a part of the periphery of the circular substrate 32, and a circular substrate at a position symmetrical to the sector-shaped flange 33 about the support shaft 30. It consists of an arm 34 extending from 32. The fan-shaped flange 33 is connected to the circular substrate 32 in a stepped manner, and a gap corresponding to the thickness of the circular substrate 32 that rotates along the surface of the chassis 10 is substantially equal to the thickness of the chassis 1.
It is secured between 0. The main gear 28 and the large gear 27 integrated therewith are located above the armed rotating body 31 (the chassis 1).
(A side far from 0), and is rotatably supported by a support shaft 30 so as to be able to rotate independently of the rotating body 31 with an arm.

In FIG. 1, a large gear 27 and a main gear 2
A first reel gear assembly 40 (including a forward take-up gear) and a second reel gear assembly 50 (including a reverse take-up gear) are disposed above both sides (upper position in the drawing) of the drive unit 8, respectively. Each of these reel gear assemblies includes a pair of large and small gears (low-speed gear and high-speed gear), and the arrangement structure thereof will be described later.

On the other hand, in FIGS. 1 and 2, a support shaft for supporting a first capstan pulley 21A and a second capstan pulley 23A disposed below both sides of the large gear 27 and the main gear 28 (a lower position in the drawing). The first capstan 21, which is
The support shafts 60A, 6
A first operation mode switching control member 60 having a partial gear tooth having 0B and a second operation mode switching control member 61 having a partial gear tooth are rotatably supported by the support shafts 60A and 60B. The first operation mode switching control member 60 with partial gear teeth is mainly formed of a sector gear body portion 60a and a curved bridge portion 60b.
An opening is provided between a and 60b so that interference with the first capstan 21 does not occur even when the member 60 rotates. Similarly, the second operation mode switching control member 61 with partial gear teeth is formed mainly of a sector gear body portion 61a and a curved bridge portion 61b, and an opening is provided between the two portions 61a and 61b. Even if 61 rotates, interference with the second capstan 23 does not occur. The gear portions of both members 60 and 61 are located at positions adjacent to the revolving orbit of the sub gear (planetary gear) 29, and mesh with the sub gear 29 that is revolving around the main gear (sun gear) 28. I have. In addition, the first with partial gear teeth
Operation mode switching control member 60, second with partial gear teeth
The operation mode switching control member 61 includes a bridge portion 60.
b, 61b and are urged by tension coil springs 62, 63 stretched between the projections of the chassis 10 and always return to the neutral position, and the sector gear body portions 60a, 61a
Are engaged with the revolving sub gear (planetary gear) 29. Further, the first and second operation mode switching control members 60 and 61 with partial gear teeth are
Each protrusion 100a, 10a of the tape running mode first switching lever 100 and the tape running mode second switching lever 101
0b, 101a, and 101b, respectively. These are a protruding portion 60d formed on the bridge portion 60b of the member 60, and a protrusion 60 protruding from the lower surface side (the side facing the chassis 10) of the bridge portion 60b.
e, the projection 6 protruding from the bridge portion 61b of the member 61
1d and 61e. When the member 60 rotates clockwise (FIG. 2), the overhang portion 60d pushes the projection 100a of the tape running mode first switching lever 100, and the member 60
When the lever rotates counterclockwise, the protrusion 60e moves the lever 1
Press the protrusion 100b of 00. When the member 61 rotates in the counterclockwise direction, the protrusion 61d of the tape running mode second switching lever 101 pushes the protrusion 101a, and the member 60 rotates.
When the lever rotates counterclockwise, the protrusion 61e moves the lever 1
Press the 01 projection 101b.

Description of Reel Gear (FIGS. 1, 2, and 3) The first reel gear assembly 40 and the second reel gear assembly 50 are composed of a large reel gear 40A, a small reel gear 40B (forward winding gear), and a large reel gear 50A. And small reel gear 50
B (reverse winding gear). Since the first and second reel gear assemblies 40 and 50 have substantially the same structure, only the second reel gear assembly will be described here, and the description of the structure of the first reel gear assembly will be omitted. The second reel gear assembly 50 is provided so as to penetrate the opening of the chassis 10 and straddle the front side and the back side of the chassis. The second reel gear assembly is a chassis 1
0, a bearing sleeve 51 fixedly mounted in the opening, a reel shaft 52 rotatably supported by the bearing sleeve 51,
A reel claw 52A press-fitted and fixed to the front end of the reel shaft 52 so as to be relatively non-rotatable, an umbrella-shaped flange 52B integrally attached to a rear end of the reel shaft 52, and a reel shaft 52 on the rear side of the chassis 10. The main components are a fitted clutch structure 53, and a large reel gear 50A and a small reel gear 50B fitted to the reel shaft 52 together with the clutch structure 53. The clutch structure 53 includes a shaft cylinder 53a having a flange 53b, a friction layer 53c (eg, made of felt) provided on the surface of the flange 53b on the side of the large reel gear 50A, and an umbrella-shaped flange 5
It comprises a first compression coil spring 53d interposed between 2B and the flange 53b, and a second compression coil spring 53e interposed between the large reel gear 50A and the small reel gear 50B. The shaft cylinder 53a rotates integrally with the reel shaft 52, but is movable within a predetermined range in the axial direction of the reel shaft. The small reel gear 50B (high-speed gear) is fixed to the end of the barrel 53a so as not to rotate relatively. Large reel gear 5
0A is rotatably fitted to the barrel 53a, and the power transmission from the large reel gear 50A to the barrel 53a (therefore, the power transmission to the reel shaft 52) is applied to the friction layer 53.
c, through the flange 53b. The pressing force of the large reel gear 50A against the friction layer 53c is:
When a large force that is obtained by the elastic restoring force of the second compression coil spring 53e and exceeds the frictional force between the friction layer 53c and the large reel gear 50A acts between the drive side and the driven side of the reel, the friction layer Sliding occurs between the large reel gear 53A and the large reel gear 50A. Further, the clutch structure 53
Is always urged toward the bearing sleeve 51 by the elastic restoring force of the first compression coil spring 53d interposed between the umbrella-shaped flange 52B and the flange 53b. Therefore, unless the inclined surface 101d of the tape running mode second switching lever 101 enters the lower surface of the small reel gear 50B and pushes up the small reel gear 50B against the urging force of the first compression coil spring 53d, the clutch structure 53 is seated on the flange portion of the bearing sleeve 51. FIG. 3 shows a small reel gear 50B, a large reel gear 50A, and a clutch structure 53.
Shows a state in which the auxiliary gear (planetary gear) 29 can be engaged with the small reel gear 50B, which is a high-speed gear, by being pushed up by the tape running mode second switching lever 101. Next, a description will be given of an operation mode switching mechanism composed of a group of levers interlocked with the rotation and revolution of the sub gear (planetary gear) 29.

Description of Operation Mode Switching Mechanism Head Chassis Driving Swing Lever 71: Swing Lever 7
1 drives the later-described head chassis 111 to an advanced position (operating position), and also includes the later-described intermediate levers 80 and 81.
The first pinch roller 90 and the second pinch roller 92 described later are displaced through the first and second capstans 21 and 23 so as to be brought into pressure contact with the first and second capstans 21 and 23. Chassis 1
0, a head chassis driving swing lever 71 is disposed between the first operation mode switching control member 60 with partial gear teeth and the second operation mode switching control member 61 with partial gear teeth. ing. The swing lever 71 is supported by a support shaft 70 erected on the chassis 10 so as to swing freely in a balance manner. The swing lever 71 has step portions 71a and 71b near both ends, and the outside, that is, the tip side, of the step portions 71a and 71b is lower than the center portion (lower toward the chassis 10).
This is to avoid interference between the rotating first operation mode switching control member 60 with partial gear teeth and the acute projections 60c, 61c of the second operation mode switching control member 61 with partial gear teeth. The swinging lever 71 has pin-shaped small protrusions 71c and 71d at both ends thereof, which are directed in a direction perpendicular to the opposite side to the chassis 10, and also has minute recesses (notches) 71e at both ends. , 71f, and is located on the center side of the steps 71a, 71b.
Locking projections 71g, 71 erected on the surface on the side facing
h. The swing lever 71 is a first operation mode switching control member 6 with a partial gear tooth that rotates in a certain operation state.
0, second operation mode switching control member 6 with partial gear teeth
The small projections 71c and 71d are pushed from the lower side in FIG. 2 by the sides of the acute angle projections 60c and 61c, respectively. The projection bases (small projections 71c, 71d) of the small projections 71c, 71d from the upper side in FIG.
Instead of itself, the main body portion of the swing lever 71) is pressed. The locking projections 71g and 71h are
Engagement projection 11 of head chassis 111 projecting from the front side to the rear side of chassis 10 through the opening of chassis 10
1a and 111b, respectively, and in the engagement relationship, the head chassis 111 is moved in the forward direction against the urging force of a head chassis return spring (torsion coil spring) stretched between the chassis 10 and the head chassis 111. (Upper side in FIG. 2).

First and second intermediate levers 80 and 81 (FIGS. 2, 7, 11, 15, and 19): The first intermediate lever 80 and the second intermediate lever 81 are forced by the swing lever 71. The first pinch roller 90 and the second pinch roller 92 are displaced so as to be in contact with the first capstan 21 and the second capstan 23 by pressing, respectively, and at the two swing limit positions of the swing lever 71. It has a function of locking to the swing lever 71 and holding the head chassis 111 at each swing limit position against the urging force of the head chassis return spring (torsion coil spring). First and second intermediate levers 80 and 81 which receive the rotational force of the first operation mode switching control member 60 with partial gear teeth and the second operation mode switching control member 61 with partial gear teeth via the swing lever 71, respectively.
Is a first operation mode switching control member 6 with partial gear teeth.
0, second operation mode switching control member 6 with partial gear teeth
1, the bridge portion 6 including the sharp projections 60c, 61c
0b, 61b and the chassis 10, and are supported by a support shaft so as to be swingably rotatable in a balance manner. It should be noted that the bridge portion 60b has a part of the bridge portion 61b including the acute angle projection 61c in a stepped shape higher than the other portions, that is, the entire portion including the acute angle projection 60c (ie, the bridge portion 61b has a stepped height). The intermediate levers 80 and 81 are positioned so as to be able to freely swing and rotate in a gap position between the chassis 10. The tip portions 80a of the first and second intermediate levers 80 and 81,
81a is pressed by the side near the minute recesses (notches) 71e and 71f of the head chassis driving swing lever 71 that swings and rotates, and the first and second intermediate levers 80 and 81 swing and rotate. At the respective swing limit positions of the swing lever 71, the tip portions 80a, 81a have minute recesses (notches) 71e, 71, respectively.
f. The other end of the first and second intermediate levers 80 and 81 is provided with a chassis 10.
Pin-like projections 80b and 81b are provided to extend to the front side of the chassis 10 through the openings. This projection 80
b and 81b respectively engage with a first pinch lever 91 and a second pinch lever 93 which are pivotally supported on the front side of the chassis 10 so as to be rotatable and rotatable. Each of the pinch levers 9 is fitted to the center of the pivoting rotation and both ends thereof are
The first pinch lever 91 and the second pinch lever 93 are respectively oscillated and rotated via one end of a torsion coil spring (not shown) for transmitting a driving force engaged with the first and the first pin 93 itself. ing. Due to the presence of the torsion coil spring for transmitting the driving force, the pinch rollers 90, 92 abut against the respective capstans 21, 23 elastically. In this sense, the driving force transmitting spring is not limited to the torsion coil spring. Similarly, the first pinch lever 91,
Another torsion coil spring (return spring for the pinch lever) is fitted in the center of the swing rotation of the second pinch lever 93, and the torsion coil spring includes the first pinch lever 91 and the second pinch lever 93. And the first pinch lever 91 and the second pinch lever 93 in the return direction (each pinch roller 90, 92).
In the direction away from each of the capstans 21 and 23), and the urging force is applied from the first pinch lever 91 and the second pinch lever 93 via the one end of the driving force transmitting torsion coil spring to the projection 80b. , 81b so that the first and second pinch levers 91, 93 return to the posture of FIG.

First and second pinch levers 91 and 93 (FIGS. 7, 11, 15, and 19): The first and second pinch levers 91 and 93 are disposed on the front side of the chassis 10. As described in the previous section, these arrangement positions are positions at which the projections 80b and 81b of the first and second intermediate levers 80 and 81 respectively engage. The first and second pinch levers 91 and 93 are supported by the support shafts 91A and 93A so as to be swingable and rotatable at the shaft cylinder portion which is the swing rotation center portion, and are respectively supported by the first and second capstans 21 and 23. It is located at the corresponding location. Also, the first and second pinch levers 91,
93 is a return direction (a direction in which the pinch roller is separated from the capstan) together with the first and second intermediate levers 80 and 81 by the return spring (torsion coil spring) for the pinch lever.
Is being biased toward. Thus, the swing lever 71 for driving the head chassis is forcibly rotated by the first operation mode switching control member 60 with partial gear teeth and the second operation mode switching control member 61 with partial gear teeth, and is rotated.
When pressing one end of each of the first and second intermediate levers 80 and 81, the first and second intermediate levers 80 and 81 move together with the first and second pinch levers 91 and 93, respectively, of the return spring for the pinch lever. When the first and second pinch rollers 90 and 93 are rotated by the first and second pinch rollers 90 and 93, the projections 80b and 81b push one end of the torsion coil spring (not shown) for transmitting the driving force. 2nd capstan 21, 23
, Respectively.

Tape running mode first and second switching levers 100 and 101 (FIG. 2): Tape running mode first and second switching levers 10 arranged on the rear side of chassis 10.
Reference numerals 0 and 101 denote members for engaging and disengaging with the respective gears of the first reel gear assembly 40 and the respective gears of the second reel gear assembly 50 to selectively switch between a low-speed gear and a high-speed gear. The first and second switching levers 100 and 101 are connected to the support shaft 1.
00A and 101A are swingably rotatably supported, and are reciprocally swingably rotated by the engagement relationship with the first operation mode switching control member 60 with partial gear teeth and the second operation mode switching control member 61 with partial gear teeth. The first switching lever 100 has a projection 100a for engaging with the member 60,
100b, a relatively large window 100c for selectively switching between the upper and lower two-stage reel gears, and a bent protruding piece 100e that can enter between the fan-shaped flange 33 of the armed rotating body 31 and the chassis 10. The projection 100b is formed by extending the main body portion of the first switching lever 100 with the same thickness, while the projection 100a is formed by the first switching lever 10
0, so that there is a gap between the protrusion 100 a and the chassis 10. Similarly, the second switching lever 101 has projections 101a and 101b for engaging with the member 61,
It has a relatively large window 101 c for selectively switching the stepped reel gear, and a bent protruding piece 101 e that can enter between the fan-shaped flange 33 of the rotating body with arm 31 and the chassis 10. The protrusion 101a is formed by extending the main body of the second switching lever 101 with the same thickness.
b is higher than the surface of the main body portion of the second switching lever 100 in a stepped manner, so that a gap exists between the projection 101b and the chassis 10. The windows 100c, 1
The upper side of FIG. 2c (FIG. 2) is formed in an arc shape corresponding to the reel axis, and the tip side is formed at both ends of the arc shape by using the thickness of the first and second switching levers 100 and 101. Two inclined surfaces 100 each of which becomes thinner
d and 101d. This inclined surface 100d,
Due to 101d, the arc-shaped portion smoothly enters under the reel gear (when the levers 100 and 101 swing and rotate in the direction of arrow A), and comes off smoothly (lever 10).
0 and 101 are pivotally rotated in the direction of arrow B).

Explanation of the parts on the front surface of the chassis (FIGS. 7 and 1)
1, FIG. 15, FIG. 19) On the front side of the chassis 10, a first reel gear assembly 40 is provided.
Reel claw 41A, first and second pinch rollers 90,
92, first and second pinch levers 91 and 93 supporting them, and reel claws 52 of the second reel gear assembly 50
A, a magnetic head 110, a head chassis 111 carrying the magnetic head 110, the head chassis 111
, Etc., which are provided at two stages in a forward position. The head chassis 111 is held by a plurality of guide pieces of the chassis 10 so that it can slide forward and backward along the surface of the chassis 10, and a torsion stretched between the head chassis and the chassis 10. It is always urged to return to the retracted position (the lower position in FIG. 7) by a coil spring (not shown). The head chassis 111 has a pair of protruding pieces 111a and 111b protruding toward the chassis 10, and these engage with the locking projections 71g and 71h of the swing lever 71 for driving the head chassis, respectively. ing. Due to the above-mentioned respective engagement relationships generated when the swing lever 71 swings and rotates, the lever 71
As a result, the head chassis 111 is moved forward against the urging spring force. The head chassis 111 also has a locking projection 111c on one side.

Further, adjacent to the head chassis 111, the locking plate 11 slides along the surface of the chassis 10 so as to be able to advance and retreat toward the head chassis 111.
2 are arranged and held by a plurality of guide pieces of the chassis 10 like the head chassis 111. Lock plate 1
12 is a projection 1 on the side adjacent to the head chassis 111.
12a, recesses 112b, 112c, and an S-shaped compression spring 11 on the side remote from the head chassis 111.
2d. The compression spring 112 d
And act to press against the side of the head chassis 111. Due to this pressing relationship, the locking projection 111c fits into the recess 112b or the recess 112c. That is, the head chassis 111
Is in the retracted position, the locking projection 111c is
b, when the head chassis 111 is in one of the two forward positions, the locking projection 111c is in the recess 112c. When the head chassis 111 is in the most advanced position,
Although the locking projection 111c is located in the recess 112c,
In a state where the head chassis 111 is slightly retracted from the most advanced position without engaging with the projection 112a, the locking projection 111c engages with the projection 112a, and the head chassis driving swing lever 71 does not swing. Despite being in a non-tilt state (a state in which the head chassis 111 is not forcibly pressed), the head chassis 111 is held without returning to the retracted position. Locking plate 112 from head chassis 111
Is performed manually by an operator as a tape cassette removal (eject) operation. When the locking plate 112 is retracted against the urging force of the S-shaped compression spring 112d, the head chassis 111 is retracted to the last retreat position, and the locking projection 111c is moved by the urging force of the S-shaped compression spring 112d. Therefore, the head chassis 11 again
It fits in the recess 112b of the locking plate 112 pressed against the first side (FIG. 19). This state is maintained until the swing lever 71 is moved next time. Hereinafter, the operation of this embodiment will be described for each operation mode.

Description of Operation Modes As described above, in this embodiment, in response to a switch operation for selecting each operation mode, the motor is rotated forward / reverse by electronic control, so that normal rotation reproduction, reverse rotation reproduction, normal rotation fast forward, The present invention relates to a tape recorder in which each operation such as reverse rotation and fast forward is performed, and each operation of forward rotation and reverse rotation is performed in a similar manner. Therefore, the description of the operation mode may be made from either the forward rotation or the reverse rotation operation mode. However, since the structure of the reel gear assembly has been described only for the take-up reel at the time of the reverse rotation reproduction, the description of the reverse rotation reproduction operation is given. Let's start with. Reverse Playback Operation (FIGS. 4 to 7): FIG. 4 shows the drive mechanism at the first stage of shifting from the pause (stop) state shown in FIG. 2 to the reverse playback operation. In the illustrated state, the motor M rotates in the reverse rotation direction (counterclockwise direction), and the rotation is transmitted to the first capstan pulley 21A and the second capstan pulley 23A via the drive belt 24, and the first and second rotations are performed. The second capstans 21 and 23 rotate. Further, the rotational force of the second capstan pulley 23A is transmitted to the main gear 28 through a path of a drive gear 25, an intermediate gear 26, a large gear 27, and a main gear (sun gear) 28 integrated with the large gear 27. Is done. The main gear 28 rotates in the reverse direction (counterclockwise direction), and accordingly, the rotating body 31 with the arm that carries the sub gear 29 shifts in the counterclockwise direction. Until the auxiliary gear 29 meshes with the gear portion of the second operation mode switching control member 61 with partial gear teeth, the rotating body with arm 3
Revolves with the transition rotation of 1, but does not rotate. FIG.
In the state (1), the auxiliary gear 29 is already engaged with the member 61 and revolves while rotating, whereby the member 61 is rotated in the counterclockwise direction.

When the revolution and rotation of the sub gear 29 further progress, and the rotation of the member 61 in the counterclockwise direction proceeds, the side of the member 61 pushes one end of the swing lever 71 for driving the head chassis, and The moving lever 71 swings clockwise, the tip portion 81a of the second intermediate lever 81 is pushed by the swing lever 71, and the second intermediate lever 81 swings counterclockwise. During this time, the rotation of the swing lever 71 is opposed to the urging force of the torsion coil spring that urges the head chassis 111 to the retracted position and the urging force of the torsion coil spring that urges the second pinch lever 93 in the return direction. The rotation of the second intermediate lever 81 is performed against the biasing force of the torsion coil spring that biases the second pinch lever 93 in the return direction. On the other hand, the projection 61d of the second operation mode switching control member 61 with partial gear teeth pushes the projection 101a of the tape running mode second switching lever 101 (the projection 101b and the projection 61d have different height levels.
The lever 101 supported on the support shaft 101A swings clockwise to rotate, and the window 101 does not interfere with each other.
The lower left side of c reaches a position close to the reel shaft 52 of the second reel gear assembly 50 (FIGS. 4 and 5). In this state, the large reel gear 50A of the second reel gear assembly 50,
The small reel gear 50B is at the lowered position, the small reel gear 50 is seated on the flange portion of the bearing sleeve 51, and the large reel gear 50A is at a height level at which it meshes with the auxiliary gear 29. The head chassis 111 carrying the magnetic head 110 moves forward by the swinging rotation of the two members 71 and 81, the second pinch lever 93 swings and the second pinch roller 92 moves forward.

When the swing rotation of the two members 71 and 81 further progresses and reaches the swing limit position of both members, the recessed portion (notch) 71f of the swing lever 71 is provided with the tip 8 of the second intermediate lever 81.
1a is engaged. At this point, the auxiliary gear 29 is disengaged from the gear portion of the second operation mode switching control member 61 with partial gear teeth (FIG. 5). After the rocking lever 71 is released from the forcing force of the member 61, the rocking lever 71 should return and rotate counterclockwise under the biasing force of the torsion coil spring for the head chassis 111. The engagement of the distal end portion 81a with the place 71f allows the second intermediate lever 81 to function as a return prevention stopper, and prevents the return swing rotation of the swing lever 71. In this state, the second pinch roller 92 is brought into contact with the rotating second capstan 23 with the elastic force of the driving force transmitting torsion coil spring pressed by the projection 81b of the second intermediate lever 81, and The head chassis 111 has reached the most advanced position,
The magnetic head 110 comes into contact with the set magnetic tape (FIG. 7). The auxiliary gear 29 released from the second operation mode switching control member 61 with partial gear teeth continues to revolve in the counterclockwise direction in FIG. On the other hand, the member 61 released from the swing lever 71
Returns to the initial position (FIG. 2) by the elastic restoring force of the tension coil spring 63. As a result of the continuous revolution, the sub gear 29 comes to mesh with the large reel gear 50A (FIG. 6). When a load is applied to the sub gear 29 due to this meshing, the sub gear 29 starts rotating clockwise due to the meshing relationship with the main gear 28 that continues to rotate, and the large reel gear 50A rotates counterclockwise. The rotation of the large reel gear 50A is controlled by the friction layer 5
3c, is transmitted to the flange 53b and the shaft cylinder 53a, and is transmitted to the reel shaft 52 and the reel claw 52A which rotate integrally with the shaft cylinder 53a, and the reel of the tape cassette fitted to the reel claw 52A takes up the magnetic tape. To start. During this time, the magnetic tape is sandwiched between the second pinch roller 92 and the rotating second capstan 23, and the reverse reproduction operation is performed.

Reverse fast-forward operation, pause operation (FIGS.
FIG. 11): Here, a case in which reverse fast forward is performed during the reverse playback operation shown in FIG. 6 will be described. When an instruction of the reverse fast-forward operation is given to the apparatus by the instruction of the operation button, the motor M starts reverse rotation in the clockwise direction, and the large gear 2
7. The main gear (sun gear) 28 and the rotating body 31 with the arm rotate clockwise, the sub gear 29 supported by the rotating body 31 with the arm starts revolving clockwise, and the large reel gear 5
Depart from OA. The detached sub gear 29 is connected to the main gear 28.
, And meshes with the gear portion of the second operation mode switching control member 61 with partial gear teeth, starts rotation and rotates the control member 61 clockwise (FIG. 8). By this rotation, the acute angle projection 61 of the control member 61 is formed.
c pushes the pin-shaped small protrusion 71d of the swing lever 71 for driving the head chassis, and the slight engagement relationship between the tip portion 81a of the second intermediate lever 81 and the minute recess (notch) 71f of the swing lever 71 is established. Immediately, the swing lever 71 swings counterclockwise by the urging force of the return coil spring for the head chassis 111, and returns from the inclined posture to the initial standby posture (see the posture shown in FIG. 9). On the other hand, the locking plate 112
Is urged toward the head chassis 111 by its own S-shaped compression spring 112d, so that the head chassis 111 released from the swing lever 71 is returned from the state shown in FIG. 7 by a spring urging force acting on itself. However, as shown in FIG.
Projection piece 111 of head chassis 111 located in 12c
c is disturbed by the engagement relationship with the projection 112a of the locking plate 112, and the head chassis 111 is in the initial standby position (retracted position).
Can't return to That is, the head chassis 11
1 is a distance at which the protrusion 111c can slightly move within the recess 112c (see the position of the protrusion 111c in FIGS. 7 and 11).
It only retreats from the most advanced position. Therefore,
The magnetic head 110 supported by the head chassis 111 also slightly retreats from the most advanced position.

When the rotation of the control member 61 proceeds due to the rotation of the sub gear 29, the protrusion 61e pushes the protrusion 101b, and the tape running mode second switching lever 101 swings around the support shaft 101A. As a result, the window 10 of the lever 101
The portion 1c moves to the lower left direction, and the inclined surface 101d at the upper right side of the window 101c enters below the small reel gear 50B seated on the flange portion of the bearing sleeve 51 (FIG. 9). Small reel gear 50B, clutch structure 53
Then, the large reel gear 50A is lifted along the reel shaft 52 (FIG. 3). In the state shown in FIG. 9, the rotation of the motor M in the clockwise direction stops, and accordingly, the rotation of the main gear 28 and the sub gear 29 also stops, and immediately, the motor M starts rotating in the counterclockwise direction. When the instruction of the temporary stop (stop) operation is given, the rotation of the motor M in the clockwise direction continues without stopping. This will be described later. When the motor M starts rotating in the counterclockwise direction, the main gear 28 starts rotating in the counterclockwise direction, the sub gear 29 starts rotating in the clockwise direction, and rotates the control member 61 in the counterclockwise direction. However, in the state of FIG. 9, a spring biasing force that returns in the counterclockwise direction has already been applied to the control member 61. Then, the auxiliary gear 29 starts revolving in the counterclockwise direction, and immediately separates from the gear portion of the control member 61. At this time, the control member 6
1 only returns to the initial state shown in FIG. 2 and does not apply a forcing force to the swing lever 71 for driving the head chassis.

The sub gear 29 revolves counterclockwise until it engages with the small reel gear 50B at the raised position. The main gear 28 continues to rotate in the counterclockwise direction, and after engaging with the small reel gear 50B, the sub gear 29 starts to rotate in the clockwise direction, and the small reel gear 50B and the shaft cylinder 53a integrated therewith (accordingly, , The clutch structure 53) rotates counterclockwise, and at the same time, the reel shaft 52
Also, the reel pawl mounted thereon rotates counterclockwise (high-speed rotation) (FIG. 10). Thus, the reverse fast forward operation is performed. This fast-forward operation is equivalent to a rewind operation during normal rotation reproduction. On the other hand, if the instruction of the temporary stop (stop) operation is given instead of the instruction of the reverse fast forward operation, the rotation of the motor M continues without stopping at the time shown in FIG. To the intermediate position between the first operation mode switching control member 60 with partial gear teeth and the second operation mode switching control member 61 with partial gear teeth, and meshes with the locking projection 10A. The rotation stops and a pause operation state is set.

When an instruction for a reverse rotation reproducing operation is given after a predetermined reverse fast forward is executed, the motor M is stopped and then starts to rotate clockwise, and the sub gear 29 is rotated by the small reel gear 50.
FIG. 8, which is an explanatory diagram of a case in which the motor revolves in the clockwise direction after being separated from B and shifts from the reverse rotation reproducing operation to the reverse rapid forward operation;
After the state shown in FIG. 9, the motor M further revolves, and is released from the engagement with the auxiliary gear 29 and the motor M stops when the second operation mode switching control member 61 with partial gear teeth returns to the initial standby position. Next, the motor M starts rotating in the counterclockwise direction, and after passing through the states shown in FIGS. 4 and 5, returns to the state shown in FIG. 6, and the reverse rotation operation is performed. Fig. 4 →
In the process leading to FIG. 6, all components operate as described above. When an instruction for a pause operation is given to the machine after execution of the reverse rotation operation, the motor M stops and then rotates clockwise to reach the state shown in FIG. 2 in which the auxiliary gear 29 is engaged with the locking projection 10A. M stops. The front side of the chassis 10 at this time is in the state shown in FIG. 11 (see the relationship between the head chassis 111 and the locking plate 112).

Forward reproduction operation (FIGS. 12 to 15): The forward reproduction operation is similar to the reverse reproduction operation, and is performed in a symmetrical relationship. Therefore, a part of the description is omitted. When an instruction for the normal rotation reproduction operation is given, the motor M starts rotating clockwise in the state shown in FIG. 2 and is transmitted to the first capstan pulley 21A and the second capstan pulley 23A via the drive belt 24. Then, the first and second capstans 21 and 23 rotate. Further, the rotational force of the second capstan pulley 23 </ b> A is
5 → intermediate gear 26 → large gear 27 → a main gear (sun gear) 28 integral with the large gear 27 is transmitted to the main gear 28. The main gear 28 rotates in the forward direction (clockwise),
Along with this, the rotating body with arm 31 carrying the auxiliary gear 29 shifts clockwise to rotate. Until the sub gear 29 meshes with the gear portion of the first operation mode switching control member 60 with partial gear teeth, the sub gear 29 revolves with the transitional rotation of the armed rotating body 31 but does not rotate. The auxiliary gear 29 is a control member 60
FIG. 12 shows a state in which the sub gear 29 that has received the load starts to rotate in the counterclockwise direction and the control member 60 starts rotating in the clockwise direction. FIG.
Has a symmetrical relationship with FIG. 4 which is an explanatory diagram of the reverse reproduction operation. Thereafter, the control member 60 pushes the swing lever 71 for driving the head chassis, and the swing lever 71 swings in the counterclockwise direction to be in the state of FIG. 13 (corresponding to FIG. 5).
In this state, the distal end portion 80a of the first intermediate lever 80 is engaged with the minute recess (notch) 71e of the swing lever 71, the sub gear 29 is disengaged from the control member 60, and the swing lever 71 is It will not return to its initial position when released from the force of 60.

At this time, the head chassis 111 has been moved to the most advanced position by the engagement relationship between the locking projection 71h of the swing lever 71 and the projection 111b (FIG. 15). Further, the first pinch lever 91 that engages with the projection 80 b of the first intermediate lever 80 swings from the initial position, and the first pinch roller 90 contacts the first capstan 21. The protruding piece 111c of the head chassis 111 is
Twelve recesses 112c are not engaged with the protrusions 112a. On the other hand, the projecting portion 60d of the first operation mode switching control member 60 with partial gear teeth pushes the projection 100a of the tape traveling mode first switching lever 100, and the lever 100 supported by the support shaft 100A swings counterclockwise. It rotates to reach a position where the lower right side of the window 100c is close to the reel shaft of the first reel gear assembly 40 (FIG. 1).
3). In this state, the large reel gear 40A and the small reel gear 40B of the first reel gear assembly are at the lowered position, and the large reel gear 40A is at a height level at which it meshes with the auxiliary gear 29.

In the state shown in FIG. 13, the auxiliary gear 29 is disengaged from the first operation mode switching control member 60 with partial gear teeth, and continues revolving clockwise together with the rotating body 31 with arms. On the other hand, the member 60 released from the swing lever 71 returns to the initial standby position by the elastic restoring force of the tension coil spring 62. As a result of the continuous revolution, the sub gear 29 comes into mesh with the large reel gear 40A of the first reel gear assembly 40 (FIG. 1).
4). When a load is applied to the sub gear 29 due to this meshing, the sub gear 29 starts to rotate in the counterclockwise direction due to the meshing relationship with the main gear 28 that continues to rotate, and the large reel gear 4
OA rotates clockwise. The rotation of the large reel gear 40A is transmitted to the reel shaft and the reel pawl 41A, and the reel of the tape cassette fitted to the reel pawl 41A starts winding the magnetic tape. During this time, the magnetic tape is sandwiched between the first pinch roller 90 and the rotating first capstan 21, and the normal rotation reproducing operation is performed.

Forward rotation fast-forward operation, pause operation (FIG. 1)
6, FIG. 17): Here, a case in which the normal rotation fast-forward is performed during the normal rotation reproducing operation shown in FIG. 14 will be described. When an instruction for a forward rotation fast-forward operation is given to the apparatus by an instruction of the operation button, the motor M starts reverse rotation in the counterclockwise direction, and the large gear 27, the main gear (sun gear) 28, and the armed rotating body 3
1 rotates in the counterclockwise direction, the sub gear 29 supported by the rotating body 31 with the arm starts revolving in the counterclockwise direction, and separates from the large reel gear 40A. The detached sub gear 29 is
Revolves according to the rotation of the main gear 28, and the first
It meshes with the gear portion of the operation mode switching control member 60, starts rotation, and rotates the control member 60 counterclockwise. Due to this rotation, the acute angle projection 60 c of the control member 60 pushes the pin-shaped small projection 71 c of the swing lever 71 for driving the head chassis, and the tip 80 of the first intermediate lever 80.
a and the minute recess (notch) 71e of the swing lever 71 is immediately released, and the head chassis 111
By the urging force of the return coil spring, the swing lever 71 swings clockwise and returns from the inclined posture to the initial standby posture (see the posture shown in FIG. 9). On the other hand, the locking plate 11
2 is urged toward the head chassis 111 by its own S-shaped compression spring 112d. Therefore, the head chassis 111 released from the swing lever 71 is caused by a spring urging force acting on itself from the state shown in FIG. Even if it is to be returned, as shown in FIG. 11, the protrusion 1 of the head chassis 111 located in the recess 112c of the locking plate 112
The head chassis 111 cannot return to the initial standby position (retracted position) because 11c is obstructed by the engagement relationship with the projection 112a of the locking plate 112. That is, the head chassis 111 only retreats from the most advanced position by a distance (see the position of the protruding piece 111c in FIGS. 15 and 11) in which the protruding piece 111c can slightly move in the recess 112c. Therefore, the magnetic head 1 supported by the head chassis 111
10 also retreats slightly from the most advanced position.

When the rotation of the control member 60 is advanced by the rotation of the sub gear 29, the protrusion 60e pushes the protrusion 100b, and the tape running mode first switching lever 100 swings around the support shaft 100A. As a result, the window 10 of the lever 100
The portion 0c shifts to the lower right direction (FIG. 16: corresponding to FIG. 8),
The slope 100d at the upper left side of the window 100c is
The small reel gear 4B enters under the small reel gear 40B and
0B, the large reel gear 40A is lifted along the reel axis. In the state shown in FIG. 17, the motor M moves counterclockwise.
Of the main gear 28 and the sub gear 29 also stop, and immediately, the motor M starts to rotate clockwise. If the instruction of the temporary stop (stop) operation is given, the rotation of the motor M in the counterclockwise direction continues without stopping. This point has been described along with the description of the reversing operation, and is exactly the same in a symmetric relationship. When the motor M starts rotating clockwise, the main gear 28 starts rotating clockwise, and the sub gear 29 starts rotating counterclockwise to rotate the control member 61 clockwise. In the state shown in FIG. 17, since the spring biasing force returning in the counterclockwise direction has already acted on the control member 61, the load on the auxiliary gear 29 is close to zero, and the auxiliary gear 29 revolves clockwise. Is started, and the control member 60 is immediately separated from the gear portion. At this time, the control member 60 only returns to the initial state shown in FIG. 2, and does not apply a forcing force to the swing lever 71 for driving the head chassis.

The sub gear 29 revolves clockwise,
The small reel gear 40B at the raised position is engaged.
The main gear 28 continues to rotate in the clockwise direction, and after engaging with the small reel gear 40B, the sub gear 29 starts to rotate in the counterclockwise direction, and the small reel gear 40B, the reel shaft and the reel mounted thereon. The pawl rotates clockwise (high-speed rotation) (FIG. 18). Thus, the normal rotation rapid traverse operation is performed. This fast-forward operation is equivalent to a rewind operation during reverse playback.

When a forward rotation reproducing operation is instructed after the execution of the predetermined forward rotation fast forward, the motor M stops and then starts rotating counterclockwise, and the sub gear 29 is rotated by the small reel gear 4.
0B, revolve in the counterclockwise direction, and further revolve after passing through the states of FIGS.
When the first operation mode switching control member 60 with the partial gear teeth is released from the engagement with the motor M, the motor M is stopped by the rotation that returns to the initial standby position. Next, the motor M starts rotating clockwise, and after passing through the states shown in FIGS. 12 and 13, returns to the state shown in FIG. 4, and the normal rotation reproducing operation is performed. When an instruction for a pause operation is given to the machine after the execution of the normal rotation reproduction operation, the motor M stops and then rotates in the counterclockwise direction, and the sub gear 29 meshes with the locking projection 10A.
And the motor M stops. The front side of the chassis 10 at this time is in the state shown in FIG. 11 (see the relationship between the head chassis 111 and the locking plate 112).

[0031]

As is apparent from the above description, there has been provided a simple and inexpensive magnetic head operating position maintaining mechanism in a tape recorder in which the operation mode is switched electronically by operating a light contact button. In the present invention, the one end of the intermediate lever is pushed by the head chassis driving swing lever and swings, and at the forward limit position of the head chassis, the one end portion is formed in the recess formed in the head chassis drive swing lever. The head chassis is maintained at the forward position by the relationship between the engagement relationship and the biasing force of the biasing spring for the head chassis and the spring member for transmitting the driving force, and at the same time, the center of the swinging rotational movement of the intermediate lever. A state in which the pinch lever is pushed via the driving force transmitting screw member by the other end of the intermediate lever located on the opposite side to the one end with respect to the point, that is, the state in which the pinch roller is in contact with the capstan The head chassis and pinch lever are displaced by a simple and inexpensive structure consisting only of combining multiple levers, and they are moved to the displaced position. It is possible to equity.

[Brief description of the drawings]

FIG. 1 shows a drive mechanism of a tape recorder as one embodiment of the present invention on a rear side (a tape cassette mounting side is a front side).
FIG. 2 is a view as viewed from the center of FIG.

FIG. 2 is a drawing showing the drive mechanism of the tape recorder as viewed from the rear side, similarly to FIG. 1, but mainly showing an operation mode changing member such as a lever.

FIG. 3 is a sectional view showing a reel gear assembly of the tape cassette.

FIG. 4 is a rear view similar to FIG. 2, showing a first transition stage from a pause mode to a reverse playback mode.

FIG. 5 is a rear view similar to FIG. 2, showing a second transition stage from the pause mode to the reverse playback mode.

FIG. 6 is a rear view similar to FIG. 2, showing a state at the time of reverse playback.

FIG. 7 is a drawing of a part of the drive mechanism of the tape recorder as viewed from the front side, and shows a positional relationship of a head chassis, a pinch roller and the like during reverse rotation reproduction.

FIG. 8 is a rear view similar to FIG. 2, showing a first transition stage from the reverse playback mode to the fast-forward mode.

FIG. 9 is a rear view similar to FIG. 2, showing a second transition stage from the reverse playback mode to the fast forward mode.

FIG. 10 is a rear view similar to FIG. 2, and shows a state at the time of a reverse fast forward operation.

FIG. 11 is a view similar to FIG. 7 showing a part of the drive mechanism of the tape recorder as viewed from the front side, and shows a positional relationship of a head chassis, a pinch roller and the like during a pause or a fast-forward operation.

FIG. 12 is a rear view similar to FIG. 2, showing a first transition stage from a pause mode to a normal rotation playback mode.

FIG. 13 is a rear view similar to FIG. 2, showing a second transition stage from the pause mode to the normal rotation playback mode.

FIG. 14 is a rear view similar to FIG. 2, showing a state at the time of normal rotation reproduction.

FIG. 15 is a drawing of a drive mechanism of the tape recorder as viewed from the front side, and shows a positional relationship of a head chassis, a pinch roller and the like during normal rotation reproduction.

FIG. 16 is a rear view similar to FIG. 2, showing a first transition stage from the normal playback mode to the fast forward mode.

FIG. 17 is a rear view similar to FIG. 2, showing a second transition stage from the normal playback mode to the fast forward mode.

FIG. 18 is a rear view similar to FIG. 2, showing a state at the time of normal rotation rapid traverse operation.

FIG. 19 is a view of a part of the drive mechanism of the tape recorder as viewed from the front side, and shows a positional relationship between a head chassis, a pinch roller, and the like after the tape cassette is taken out.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Chassis 10A Locking protrusion 20 Drive mechanism 21 1st capstan 21A 1st capstan pulley 22 Guide pulley 23 2nd capstan 23A 2nd capstan pulley 24 Drive belt 25 Drive gear 26 Intermediate gear 27 Large gear 28 Main gear ( 29 Sun auxiliary gear (planetary gear) 30 Support shaft 31 Rotating body with arm 32 Circular board 33 Sector-shaped flange 34 Arm 40 First reel gear assembly 40A Large reel gear 40B Small reel gear 41A Reel claw 50 Second reel gear assembly 50A Large reel gear 50B Small reel gear 51 Bearing sleeve 52 Reel shaft 52A Reel claw 52B Umbrella-shaped flange 53 Clutch structure 53a Shaft tube 53b Flange 53c Friction layer 53d First compression coil spring 53e Second compression coil spring 60 First operation with partial gear teeth Mode switching Control member 60a fan-shaped gear body 60b bridge 60c acute projection 60d overhang 60e projection 61 second operation mode switching control member 61a with partial gear teeth 61a sector gear body 61b bridge 61c acute projection 61d, 61e projection 62; 63 Tension coil spring 70 Support shaft 71 Head chassis driving swing lever 71a, 71b Stepped portion 71c, 71d Pin-shaped small protrusion 71e, 71f Micro recess (notch) 71g, 71h Locking protrusion 80 First intermediate lever 80a Tip Part 80b Projection 81 Second intermediate lever 81a Tip part 81b Projection 90 First pinch roller 91 First pinch lever 91A Support shaft 92 Second pinch roller 93 Second pinch lever 93A Support shaft 100 Tape running mode first switching lever 100A Support shaft 100a, 1 0b Projection 100c Window 100d Inclined surface 100e Curved protrusion 101 Tape running mode second switching lever 101A Support shaft 101a, 101b Projection 101c Window 101d Inclined surface 101e Curved protrusion 110 Magnetic head 111 Head chassis 111a, 111b, 111c Projection 112 Stop plate 112a Projection 112b, 112c Recess 112d S-shaped compression spring M Motor

Claims (2)

[Claims] A head chassis which carries a magnetic head and is displaced between an advanced position where the magnetic head contacts the magnetic tape and a retracted position where the magnetic head is separated from the magnetic tape; Swing lever for displacing the head chassis from the front to the forward position, an urging spring for constantly urging the head chassis in the backward direction, a first position for carrying a pinch roller and bringing the pinch roller into contact with the capstan A pinch lever that swings and displaces between the pinch roller and a second position away from the capstan; a driving force transmitting spring member that elastically presses the pinch lever; An intermediate lever interposed between the lever and the driving force transmitting spring member to transmit driving force from the former to the latter; When the head chassis is moved from the retracted position to the advanced position by the swinging movement of the swinging lever, one end of the intermediate lever is pushed by the head chassis swinging lever and swings,
At the forward limit position of the head chassis, the one end is engaged with a recess formed in the head chassis driving swing lever, and the engagement relationship is determined by the urging spring and the driving force transmitting spring member. The head chassis is maintained at the forward position by the relationship with the force, and at the same time, the other end of the intermediate lever is located on the opposite side to the one end with respect to the center point of the swinging rotational movement of the intermediate lever. A magnetic head operating position maintaining mechanism for a tape recorder, wherein a state in which a pinch lever is pressed, that is, a state in which a pinch roller is in a first position and in contact with a capstan is maintained. 2. A tape recorder of a type in which a drive motor rotates forward and backward in response to a switch operation for selecting each operation mode, and each operation such as forward rotation reproduction, reverse rotation reproduction, forward rotation fast forward, and reverse rotation fast forward is performed. A pair of the pinch levers each carrying the pinch roller, and a pair of the pinch levers interposed between the swing lever for driving the head chassis and the pinch levers and engaged with both members, respectively. 2. The apparatus according to claim 1, further comprising the intermediate lever.
3. A magnetic head operating position maintaining mechanism for a tape recorder according to claim 1.