JP2001056988A - Magnetic recording/reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the occurrence of worn particles from an abutting position between a torsion spring and a spring receiving part in a magnetic recording/ reproducing device constructed in such a manner that by engaging the engaging part of a driving arm with the engaged part of a slider cam, the slider cam is moved following the movement of the driving arm. SOLUTION: This magnetic recording/reproducing device is provided with a slider cam for moving a cassette holder to a specified loading position, a driving arm for moving this slider cam, and a torsion spring 80 for pressing an engaging pin 77 to an engaged port formed in the slider cam by an elastic force, one end 80b thereof being connected to the slider cam and the other end 80a being connected to the engaging pin 77 formed in the driving arm. In the position of contact between the torsion spring 80 and the engaging pin 77, a spring receiving member 78 made of a resin and having a bent recess 78a corresponding to the sectional shape of the torsion spring 80 is disposed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus, and more particularly, to a slider cam that moves with the rotation of a drive arm when an engagement section of a drive arm is engaged with an engagement section of the slider cam. The present invention relates to a magnetic recording / reproducing apparatus having a configuration as described above.

[0002]

2. Description of the Related Art Generally, in a magnetic recording / reproducing apparatus such as a digital audio tape recorder (DAT), an inserted tape cassette is mounted at a predetermined recording / reproducing position in the apparatus. Is provided from the inside of the apparatus.

The cassette loading / unloading mechanism generally includes a cassette holder into which a tape cassette is loaded, and a loading and unloading of the tape cassette to a predetermined recording / reproducing position in the apparatus by urging the cassette holder horizontally and vertically. And a drive arm for driving the slider cam. The shaft arranged on the side of the cassette holder is formed on the chassis side wall of the magnetic recording / reproducing apparatus and is engaged with the L-shaped groove, so that the cassette holder moves in the horizontal and vertical directions along the L-shaped groove. It has a possible configuration. The slider cam is configured to be movable on a chassis of the magnetic recording / reproducing apparatus, and an inclined groove (cam) is formed on a side wall thereof.

[0004] The inclined groove is configured to engage with a shaft provided on the side of the cassette holder. Therefore, when the slider cam moves on the chassis, the cassette holder moves while the movement direction is regulated by the L-shaped groove and the inclined groove. As a result, the cassette holder performs a predetermined tape cassette loading / unloading operation. The slider cam is driven by a drive arm provided on the chassis. The drive arm is configured to be rotated by a mode motor, and an engagement pin that engages with an engaged opening formed in the slider cam is provided at the tip of the drive arm. Also, when the slider cam is driven by the drive arm, a torsion spring is arranged between the slider cam and the engagement pin to prevent rattling between the engaged port and the engagement pin engaged with the slider cam. The torsion spring prevents the occurrence of the rattling by constantly pressing and biasing the engaging pin against the edge of the engaged port.

[0005]

FIG. 8 is an enlarged view showing the vicinity of an engagement pin provided in a conventional magnetic recording / reproducing apparatus. As shown in the figure, an engaging pin 177 has a post portion 177a that comes into contact with an edge of an engaged opening of a slider cam (not shown), and a torsion spring 180
Of the spring receiving portion 178 (the end 18
0a is referred to as a contact surface 178a).

A flange 177b is formed below the spring receiving portion 178 integrally with the post 177a.
Further, a torsion spring 180 is provided above the spring receiving portion 178.
A detachment prevention plate 179 is provided to prevent the end 180a of the cover member 180 from detaching from the engagement pin 177. By the way, since the slider cam is moved by the rotation of the drive arm as described above, the engagement state between the engaged port and the engagement pin changes with the rotation of the drive arm.
The contact state between the zero end 180a and the spring receiving portion 178 also changes. Specifically, the end 18 of the torsion spring 180
0a is displaced on the spring receiving portion 178 in the direction in which the end portion 180a extends (the direction perpendicular to the paper surface of FIG. 8), and is also displaced in the directions indicated by arrows C1 and C2 in the figure.

However, conventionally, as described above, the contact surface 1
78a is a flat surface, and the contact surface 17
8a, end 1 of torsion spring 180 having a circular cross section
80a is configured to be in contact therewith. For this reason, the end 1
80a and the contact surface 178a are in point contact with each other,
a slides in the direction perpendicular to the paper surface of FIG. 8 and the arrows C1 and C2 in the drawing with respect to the contact surface 178a, and there is a problem that the contact surface 178a is liable to wear.

Further, when the end portion 180a is largely displaced in the directions of the arrows C1 and C2 in the drawing, the end portion 180a comes into contact with the separation preventing plate 179 or the flange portion 177b, which also generates abrasion powder. There was a problem that would. As described above, when the end portion 180a and the spring receiving portion 178 (the detachment preventing plate 179 and the flange portion 177b) come into contact with each other and generate abrasion powder, the abrasion powder may adhere to other devices such as the rotary cylinder 5, This may hinder proper magnetic recording / reproducing processing.

Further, the end portion 180a and the spring receiving portion 178 are provided.
It is conceivable to suppress the generation of abrasion powder by applying grease between the (prevention plate 179 and the flange 177b). However, in this case, the grease may adhere to other devices. The present invention has been made in view of the above points, and an object of the present invention is to provide a magnetic recording / reproducing apparatus capable of suppressing generation of abrasion powder from a contact position between a torsion spring and a spring receiving portion.

[0010]

According to the present invention, there is provided a slider cam for moving a cassette holder, on which a tape cassette is mounted, to a predetermined mounting position by moving on a chassis. A drive arm for moving the slider cam by rotating when the tape cassette is inserted and ejected, and one end connected to the slider cam; And a torsion spring that has the other end connected to the engaging portion and presses and biases the engaging portion against the engaged portion by an elastic force. A spring receiving member formed of resin and having a concave portion corresponding to a cross-sectional shape of the torsion spring is provided at a position where the torsion spring and the engaging portion are connected. It is characterized in that it has set.

As described above, by disposing the spring receiving member having the concave portion corresponding to the cross-sectional shape of the torsion spring, the torsion spring and the concave portion come into surface contact, and the contact area can be increased. Further, the movement of the torsion spring can be restricted by engaging with the concave portion. Therefore, it is possible to suppress the generation of wear powder between the spring receiving member and the torsion spring, thereby preventing the adverse effects of the wear powder from occurring on other devices. It can be performed. Further, since the spring receiving member is formed of a resin, a concave portion corresponding to the cross-sectional shape of the torsion spring can be easily formed.

[0012]

Next, embodiments of the present invention will be described with reference to the drawings. 1 and 2 show a magnetic recording / reproducing apparatus 1 (hereinafter, simply referred to as an apparatus 1) according to an embodiment of the present invention. In each drawing, a digital audio tape recorder (DAT) is shown as an example of the device 1. FIG. 1 is a plan view and a front view of the device 1, and FIG. 2 is an exploded perspective view of the device 1.

The device 1 is a digital audio tape recorder (DAT) of a rotary type as described above.
In brief, a cassette mounting / dismounting mechanism 3, a reel driving mechanism 4, a rotary cylinder 5, a tape loading mechanism 6, protection mechanisms 8A and 8B, a mode switching mechanism 20, and the like are arranged on the chassis 2. Reel drive mechanism 4
Is a mechanism for rotationally driving the supply-side reel 9 and the take-up reel 10. Each of the reels 9 and 10 is set in a mode of the apparatus 1 (for example, a recording / reproducing mode, a fast-forward / rewind mode, a fast-forward search / rewind search mode, etc.).
Thus, the rotation speed, rotation direction, and the like are controlled. For this reason, a reel swing idler gear (not shown), various gears, pulleys, idlers, and the like (not shown) are compactly arranged in the reel drive mechanism 4.

The rotary cylinder 5 is mounted on a drum base 7. In this rotary cylinder 5, a magnetic tape (not shown) drawn from a tape cassette is wound around a predetermined angle, and performs magnetic recording / reproducing processing on the magnetic tape as the tape runs. The tape loading mechanism 6 is a mechanism for pulling out the magnetic tape from the tape cassette and winding the magnetic tape around the rotary cylinder 5 over a predetermined angle. This tape loading mechanism 6 is shown in FIG.
Is driven by a mode switching mechanism 20 shown in FIG.

The tape loading mechanism 6 employs the so-called M loading in this embodiment. The tape loading mechanism 6 is driven by the mode switching mechanism 20 as described above, and the pair of loading bases 12, 1 are driven.
The magnetic tape 3 is moved along guide grooves 14 and 15 formed in the drum base 7, and the magnetic tape is loaded or unloaded accordingly. Loading posts 16 and 1 for loading a magnetic tape are placed on the pair of loading bases 12 and 13.
7 and inclined poles 18, 19 are erected.

The mode switching mechanism 20 includes a mode switching gear (not shown), a link, a mode switching plate, and the like. The mode switching gear is configured to be driven to rotate by a mode switching motor 20. Each mechanism (cassette mounting / dismounting mechanism 3, tape loading mechanism 6, etc.) constituting the apparatus 1 is connected to the mode switching plate, and the mode switching plate is moved to a predetermined mode switching position by the mode switching motor 20. Thus, the mode of the device 1 is switched.

The pinch roller arm 39 is also rotated by the mode switching mechanism 20. When the pinch roller arm 39 is rotated by the mode switching mechanism 20, the pinch roller 22 provided on the pinch roller arm 23 causes the magnetic tape to move the capstan motor 11.
Is pressed against the capstan shaft, which is the rotating shaft of. Accordingly, the tape traveling speed and the tape traveling direction of the magnetic tape are controlled according to the rotational speed and the rotational direction of the capstan motor 11.

The cassette loading / unloading mechanism 3 is for loading a tape cassette (not shown) at a predetermined recording / reproducing processing position in the apparatus 1. This cassette loading / unloading mechanism 3
In brief, it includes a cassette holder 24 into which a tape cassette is inserted and mounted, a slider cam 27 movable on the chassis 2 in the directions of arrows X1 and X2 in the figure, a drive arm 70 for moving the slider cam 27, and the like. .

The cassette holder 24 has a bottom plate 45 disposed below the pair of side guides 25 and a top plate 4 disposed above.
6 is arranged in a housing shape, and a tape cassette is inserted and mounted in its internal space. On both sides of the top plate 46, a cassette pressing spring 47 for pressing the upper surface of the tape cassette inserted and mounted in the cassette holder 24 is provided.
Are arranged. The tape pressing spring 47 presses the tape cassette against the bottom plate 45, thereby preventing the tape cassette from rattling in the cassette holder 24.

At the center of the top plate 46, a cassette locking spring 48 is provided. The cassette locking spring 48 has a function of locking the tape cassette in the cassette holder 24 by engaging with a locking groove formed on the upper surface of the tape cassette. Also,
On each side guide 25, shafts 49 and 50 extending outward are implanted. This shaft 4
Reference numerals 9 and 50 are engaged with inclined grooves 58 and 59 formed in the slider cam 27 to be described later, and L-shaped elongated holes 43 and 4 formed in the side wall 26 erected on both sides of the chassis 2.
4 is engaged. In addition, the shaft 50 and the L-shaped long hole 44
A bush 68 is interposed between the shafts and the respective bushes 68 are rotatably fixed to the shaft 50 by screwing a screw 67 to the shaft 50.

The slider cam 27 is integrally formed by press-molding a plate-like material, and has an upper plate 55 and a side plate 56. The upper plate 55 is provided with protection mechanisms 8A and 8B described later, and the side plate 56 is provided with inclined grooves 58 and 59 through which the shafts 49 and 50 provided on the cassette holder 24 are inserted and engaged.
(Cam) is formed. An engaged port 60 is formed at a substantially central position of the upper plate 55, and a spring mounting pin 61 to which a torsion spring 80 described later is mounted is provided upright at a position near the engaged port 60. I have.

The movement locus of the cassette holder 24 is determined by the inclined grooves 58 and 59 formed in the slider cam 27.
And an L-shaped elongated hole 4 formed in the side wall 26 of the chassis 2
3, 44. Accordingly, when the slider cam 27 is moved in the direction of arrow X1 in the figure by the drive arm 70, the shaft 4 provided in the cassette holder 24 and engaged with the inclined grooves 58, 59 of the slider cam 27.
9 and 50 are guided and moved by the L-shaped long holes 43 and 44 as the slider cam 27 moves.

As a result, first, the cassette holder 24 moves horizontally in the direction of the arrow X1 in the figure and then moves downward, and the tape cassette mounted on the cassette holder 24 is transported to a predetermined recording / reproducing position in the apparatus 1. When the slider cam 27 moves in the direction of the arrow X2 in the figure, the cassette holder 24 performs an operation reverse to the above, and moves from a predetermined recording / reproducing position to a predetermined ejecting position (a position at which the tape cassette is mounted to and removed from the cassette holder 24). Move to.

The drive arm 70 includes a push section 72, an arm section 73, a lever section 74,
And an engaging portion 77 and the like. Bush part 7
2 has a cylindrical shape having a shaft hole 72a at the center thereof, and is supported by a shaft 71 erected on the chassis 2. Thereby, the drive arm 70 is configured to be rotatable around the shaft 71.

The arm portion 73 extends horizontally from the upper portion of the push portion 72, and an engaging portion 77 is formed at the tip thereof. The lever portion 74 extends downward from the upper portion of the push portion 72, and the distal end portion 74a is bent to have an L-shape. A pin 75 is provided at the tip 74a so as to protrude downward.

The pin 75 is connected to a mode switching gear of the mode switching mechanism 20 through an elongated hole 81 formed in the chassis 2 as shown in FIG. Accordingly, when the mode switching mechanism 20 is driven, the drive arm 70 is moved around the shaft 71 as indicated by an arrow A in FIG.
It rotates in the directions indicated by 1 and A2. The engagement portion 77 formed at the distal end of the arm portion 73 is engaged with the slider cam 27 by being inserted into the engaged hole 60.
Therefore, when the drive arm 70 rotates in the direction of arrow A1, the slider cam 27 moves in the direction of arrow X2 in the figure, and when the drive arm 70 rotates in the direction of arrow A2, the slider cam 27 moves in the direction of arrow X1 in the figure. It is configured to move to.

The slider cam 27 is connected to the drive arm 7.
0, a torsion spring 80 is provided between the slider cam 27 and the engaging portion 77 in order to prevent rattling between the engaged port 60 and the engaging portion 77.
Are arranged. One end 8 of this torsion spring 80
0a is hooked on the engaging portion 77, and the other end portion 80b is hooked on the spring hooking portion 69 of the slider cam 27. Then, the engagement portion 77 is formed by the elastic force of the torsion spring 80.
Is constantly pressed and urged to the edge of the engaged opening to prevent the above-mentioned rattling.

FIG. 7 is an enlarged view of the engagement portion 77. As shown in the figure, the engaging portion 77 includes a post portion 77a that abuts on an edge of the engaged opening 60 formed in the slider cam 27, and an end portion 80
and a resin receiving portion 78 with which a contacts. A flange portion 77b is formed integrally with the post portion 77a at a lower portion of the spring receiving portion 78, and an end portion 80 of the torsion spring 80 is further formed at an upper portion of the spring receiving portion 78.
a preventing release plate 7 from separating from the engagement portion 77.
9 are provided.

Here, the spring receiving portion 7 at the position where the spring receiving portion 78 and the end portion 80a of the torsion spring 80 contact each other.
Paying attention to the shape of No. 8, in the present embodiment, a curved concave portion 78a is formed at this contact position. This curved concave portion 78
a is formed so as to have a shape corresponding to the cross-sectional shape of the torsion spring 80. Thus, the spring receiving portion 7
By forming the curved concave portion 78a corresponding to the cross-sectional shape of the torsion spring 80 on the torsion spring 8, the torsion spring 80 and the spring receiving portion 78 (curved concave portion 78a) come into surface contact, and the contact area can be increased. Also, the torsion spring 80
By engaging with the curved concave portion 78a, the movement in the directions of arrows C1 and C2 in the figure is restricted.

Therefore, the generation of wear powder between the spring receiving member 78 and the torsion spring 80 can be suppressed. As a result, it is possible to prevent the adverse effects caused by the abrasion powder from adhering to other devices, and to ensure a favorable magnetic recording / reproducing process. Further, since the spring receiving member 78 is formed of resin, the curved concave portion 78a corresponding to the cross-sectional shape of the torsion spring 80 can be easily formed. Further, by using a resin material having good slipperiness as a material of the spring receiving member 78,
Grease can be eliminated. Therefore, it is possible to prevent the grease from adhering to other devices, and it is also possible to secure a favorable magnetic recording / reproducing process.

The protection mechanisms 8A and 8B have a function of preventing the cassette holder 24 from being unnecessarily displaced on the chassis 2 when the tape cassette is not mounted. Therefore, this protection mechanism 8
The cassette holder 24 does not move even if a foreign substance other than a tape cassette is inserted into the apparatus 1 by A and 8B. This can prevent foreign matter from entering the device 1 and prevent the device 1 from being damaged by foreign matter insertion. Hereinafter, a specific configuration of the protection mechanisms 8A and 8B will be described.

The protection mechanism 8A and the protection mechanism 8B are arranged substantially vertically symmetrically in the state shown in FIGS. 1 and 3A. Therefore, the corresponding components of the protection mechanisms 8A and 8B will be described with the same reference numerals. Protection mechanism 8
A and 8B are arranged on the upper plate 55 of the slider cam 27, so that the slider cam 27 moves in the directions of arrows X1 and X2 in FIG. Each of the protection mechanisms 8A and 8B includes a protector cam arm 30, a protector arm 36, first and second engagement recesses 35 and 40, and the like.

The protector cam arm 30, as shown in an enlarged view in FIG. 4, has a structure in which a cassette engaging arm 31, a cam 32, a first lock piece 33 and the like are integrally formed. A shaft hole 43a is formed in the protector cam arm 30, and the shaft hole 43a is supported by a support shaft 34 erected on the slider cam 27. Therefore, the protector cam arm 30 is rotatably supported by the support shaft 34.

The protector cam arm 30 has a cam portion 32, and its formation position is selected at the end opposite to the formation position of the cassette engagement arm portion 31 with respect to the shaft hole 43a. . The cam portion 32 is a concave portion having a substantially trapezoidal shape, and a driven portion 37 of a protector arm 36 described later is engaged with the cam portion 32. At the time of this engagement, the driven portion 37 is configured to be displaceable within the cam portion 32.

The first lock piece 33 is formed so as to protrude toward the side wall 26 erected on the chassis 2. The first lock piece 33 is attached to the side wall 26 in the unmounted state.
(See FIG. 1). On the other hand, the protector arm 36
As shown in an enlarged manner in FIG.
And the second lock piece 38 is integrally formed. A shaft hole 39 a is formed in the protector arm 36, and the shaft hole 39 a is supported by a support shaft 39 erected on the slider cam 27. Therefore, the protector arm 36 is rotatably supported by the support shaft 39.

The driven portion 37 is formed so as to be engaged with the cam portion 32 formed on the protector cam arm 30 as described above. The second lock piece 38 is formed so as to project toward the side wall 26 erected on the chassis 2. The first lock piece 33 is configured to engage with a second engagement recess 40 formed in the side wall 26 in the unmounted state.

The protector arm 36 has a spring retaining portion 36a, and a coil spring 57 is stretched between the spring retaining portion 36a and the slider cam 27. The coil spring 57 generates an elastic force for urging the protector arm 36 to rotate in a direction indicated by an arrow B1 in FIG. Therefore, this protector arm 36
Is transmitted to the protector cam arm 30 by the cam portion 32 being engaged with the cam portion 32, and the protector cam arm 30 is moved by the elastic force of the coil spring 57 in FIG.
(A) is urged to rotate in the direction indicated by arrow D1. However, each of the arms 30 and 36 has a configuration in which the first and second lock pieces 33 and 38 are engaged with the side wall 26 of the chassis 2 as described above, whereby further rotation is restricted. I have.

Next, the operation of the protection mechanisms 8A and 8B configured as described above will be described. In FIG. 1, when the tape cassette is inserted into the cassette holder 24 in a normal state (inserted in the direction of arrow X1) in the protection mechanism 8A in the unmounted state located on the right side, the leading end of the tape cassette is inserted with this insertion operation. The portion engages with and presses the cassette engaging arm portion 31. Therefore, the protector cam arm 30 rotates about the support shaft 34 against the elastic force of the coil spring 57, whereby the first lock piece 3
3 also rotates, and the first engagement recess 35 and the first lock piece 33
Is disengaged.

When the protector cam arm 30 rotates as described above, the cam portion 32 also rotates, so that the protector arm 36 also pivots via the driven portion 37 engaged with the cam portion 32. The rotation is urged about the center. As described above, when the protector arm 36 rotates, the second lock piece 38 also rotates with the rotation, and the engagement between the second engagement recess 40 and the second lock piece 38 is released. Thereby, the slider cam 27 is mounted on the chassis 2.
Is movable.

On the other hand, when the tape cassette is inserted into the cassette holder 24 in an abnormal state (for example, when the tape cassette is inserted at an angle, etc.), the protector cam arm 30
Does not rotate normally, so the first and second lock pieces 3
3, 38 maintain the state engaged with the first and second engagement recesses 35, 40. Therefore, the slider cam 27 maintains the state locked to the chassis 2.

As described above, by providing the protection mechanisms 8A and 8B, the movement of the slider cam 27 (ie, the cassette holder 24) with respect to the chassis 2 is restricted except when the tape cassette is inserted in a normal state. Therefore, it is possible to prevent foreign substances from entering the device 1.
By the way, the protection mechanism 8A, 8B having the above configuration
Is installed on the slider cam 27 in advance at the time of assembling the apparatus 1 and then incorporated. Therefore, if the arms 130 and 136 are simply rotatably supported by the support shafts 134 and 139 as in the related art, when the protector arm 136 is excessively rotated by the elastic force of the coil spring 157, the arm of the protector arm 136 is turned off. When the driven portion 37 is separated from the cam portion 132 of the protector cam arm 130,
As described above, the engagement of the gears 30, 136 is released, and various problems such as a reduction in assembling workability occur (see FIG. 8).

On the other hand, in the present embodiment, a rotation restricting piece 62 for restricting the rotation of the protector arm 36 at a predetermined position.
(Detailed in FIGS. 2 and 3A). The rotation restricting piece 62 is provided within the range of rotation of the protector arm 36 which is rotationally urged by the elastic force of the coil spring 57 (this range is also a range where the coil spring 57 is not permanently deformed), and It is provided at a predetermined rotation position before reaching a disengagement position where the engagement between the cam arm 30 and the protector arm 36 is released.

With this configuration, even if the protector arm 36 is rotated in the direction in which the protector arm 36 is disengaged from the protector cam arm 30, the protector arm 36 cannot be disengaged from the protector arm 36 before the engagement between the arms 30, 36 is released. Engages with the rotation restricting piece 62 to restrict its rotation. Therefore, by providing the rotation restricting piece 62, the engagement of the arms 30, 36 can be reliably prevented from being released.

Thus, when the slider cam 27 is mounted on the chassis 2, the process of engaging the protector cam arm 30 and the protector arm 36, which is conventionally required, becomes unnecessary, and the assembling efficiency of the device 1 is improved. Can be. In addition, it is possible to prevent the arms 30 and 36 from being excessively rotated by the assembling worker during assembling, and to prevent permanent deformation (damage) of the coil spring 57.

Further, in this embodiment, the rotation restricting piece 62 is constituted by a cut-and-raised portion formed integrally with the slider cam 27. Therefore, the number of parts and the number of assembling steps can be reduced as compared with the configuration in which the rotation restricting piece 62 is provided as a separate part on the slider cam 27, and thus the cost of the apparatus 1 can be reduced. In the above-described embodiment, the rotation restricting piece 62 is engaged with the protector arm 36 at the predetermined position to restrict the rotation thereof.
It is also possible to adopt a configuration that engages with the predetermined position and regulates its rotation.

[0046]

As described above, according to the present invention, the torsion spring and the concave portion come into surface contact and the contact area can be widened, and the movement of the torsion spring can be restricted by engaging with the concave portion. Therefore, it is possible to suppress generation of wear powder between the spring receiving member and the torsion spring. As a result, it is possible to prevent other devices from being adversely affected by the abrasion powder, so that a good magnetic recording / reproducing process can be performed.

Further, since the spring receiving member is formed of resin, a concave portion corresponding to the sectional shape of the torsion spring can be easily formed.

[Brief description of the drawings]

FIG. 1 shows a magnetic recording / reproducing apparatus according to an embodiment of the present invention, in which (A) is a plan view and (B) is a front view.

FIG. 2 is an exploded perspective view of a magnetic recording / reproducing apparatus according to one embodiment of the present invention.

3A and 3B show a slider cam provided in a magnetic recording / reproducing apparatus according to one embodiment of the present invention, wherein FIG. 3A is a plan view, FIG. 3B is a front view, and FIG. It is.

FIG. 4 is a plan view of a protector cam arm provided in the magnetic recording / reproducing apparatus according to one embodiment of the present invention.

FIG. 5 is a plan view of a protector arm provided in the magnetic recording / reproducing apparatus according to one embodiment of the present invention.

FIGS. 6A and 6B show a drive arm provided in a magnetic recording / reproducing apparatus according to an embodiment of the present invention, wherein FIG. 6A is a plan view and FIG. 6B is a front view.

FIG. 7 is an enlarged view showing an engagement pin of the drive arm.

FIG. 8 is an enlarged view showing an engagement pin of a drive arm provided in a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 2 Chassis 3 Cassette loading / unloading mechanism 4 Reel drive mechanism 5 Rotary cylinder 6 Tape loading mechanism 8A, 8B Protect mechanism 11 Capstan 20 Mode switching mechanism 21 Mode switching gear 24 Cassette holder 27 Slider cam 30 Protector cam arm 31 Cassette engaging arm 32 Cam part 33 First lock piece 35 First engagement concave part 36 Protector arm 37 Follower part 38 Second lock piece 40 Second engagement concave part 47 Cassette holding spring 57 Coil spring 60 Engaged opening 61 Spring mounting pin 62 Rotation restricting piece 70 Drive arm 71 Shaft 72 Bush part 73 Arm part 74 Lever part 75 Pin 77 Engagement part 78 Spring receiving member 78a Curved concave part 80 Torsion spring 80a, 80b End part

Continued on the front page (72) Inventor Masahiro Harima 1601 Sakai, Atsugi-shi, Kanagawa Prefecture F-term in Atsugi Works, Mitsumi Electric Co., Ltd. 5D094 AA01 AB06 AB07 BC15 BD15 EB11 EB13 EC20

Claims (1)

[Claims] 1. A slider cam for moving a cassette holder, on which a tape cassette is mounted, to a predetermined mounting position by moving on a chassis, and an engaging portion, which engages with an engaged portion formed on the slider cam. A drive arm that rotates and moves the slider cam when the tape cassette is inserted and ejected; and a drive arm having one end connected to the slider cam and the other end connected to the engagement portion. A magnetic recording / reproducing device comprising: a torsion spring for urging the engaging portion toward the engaged portion by an elastic force having the torsion spring; wherein at a position where the torsion spring and the engaging portion are connected,
A magnetic recording / reproducing apparatus comprising a spring receiving member formed of resin and having a concave portion corresponding to a cross-sectional shape of the torsion spring.