JP4106824B2 - Magnetic recording / reproducing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a magnetic recording / reproducing apparatus, and more particularly, to a magnetic recording / reproducing apparatus having a cleaning mechanism for cleaning a capstan shaft by contacting the capstan shaft.
[0002]
[Prior art]
Generally, in a magnetic recording / reproducing apparatus such as a digital audio tape recorder (DAT), the inserted tape cassette is mounted at a predetermined recording / reproducing position in the apparatus, and the tape cassette is ejected from the apparatus after the recording / reproducing process is completed. A cassette loading / unloading mechanism is provided.
[0003]
This cassette loading / unloading mechanism generally includes a cassette holder on which a tape cassette is loaded, and a slider cam for loading and unloading the tape cassette at a predetermined recording / reproducing position in the apparatus by urging and moving the cassette holder in the horizontal and vertical directions. And a drive arm for driving the slider cam.
The shaft disposed 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 horizontally and vertically along the L-shaped groove. It has a possible configuration.
[0004]
The slider cam is formed on the side wall of the chassis of the magnetic recording / reproducing apparatus and is engaged with the linear groove. Therefore, the slider cam is configured to be movable in the horizontal direction along the linear groove. An inclined groove (cam) is formed on the side wall of the slider cam.
This inclined groove is configured to engage with a shaft disposed on the side of the cassette holder. Accordingly, 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 tape cassette held in the cassette holder is transported between a predetermined mounting position (position where magnetic recording / reproducing processing is performed) in the apparatus and an ejection position (position where the tape cassette is inserted into and removed from the cassette holder). Is done.
[0005]
The drive arm is configured to be rotated by a mode motor, and an engagement portion that engages with the slider cam is formed at the tip of the drive arm. Therefore, the slider cam is driven by the rotation of the drive arm, whereby the slider cam moves on the chassis.
On the other hand, the magnetic tape pulled out from the tape cassette is pressed against the rotating shaft of the capstan motor (hereinafter referred to as the capstan shaft) by the pinch roller, and is thereby configured to run at a constant speed at the rotating speed of the capstan motor. Yes.
[0006]
When the capstan shaft is contaminated, the magnetic tape cannot run stably at a constant speed. For this reason, a cleaning mechanism for removing dirt adhering to the capstan shaft is provided in the magnetic recording / reproducing apparatus.
FIG. 12 shows an example of a cleaning mechanism provided in a conventional magnetic recording / reproducing apparatus. As shown in the figure, the cleaning mechanism 185 is roughly constituted by a cleaning arm 186 and a cleaning cam member 186.
[0007]
The cleaning arm 186 is rotatably attached to a support shaft 183 provided in the capstan motor, and is thus configured to be rotatable in the directions of arrows E1 and E2 in the drawing. A blade-shaped cleaning portion 190 is formed at the end of the cleaning arm 186 in the direction of the arrow X2 in the drawing. The cleaning unit 190 abuts against the capstan shaft 111 (indicated by the alternate long and short dash line), so that dirt attached to the capstan shaft 111 can be removed.
[0008]
Also, a spring hooking hole 191 is provided at the end of the cleaning arm 186 in the direction of the arrow X1, and the other end of a coil spring whose one end is connected to the chassis is connected to the spring hooking hole 191. Is done. Due to the elastic force of the coil spring, the cleaning arm 186 is always urged to rotate in the direction of arrow E1 in the figure.
On the other hand, the cleaning cam member 186 has a substantially columnar shape, and is rotatably attached to a support shaft 184 provided in the chassis. Therefore, the cleaning cam member 186 can rotate in the directions of arrows F1 and F2 in the drawing. Has been. The cleaning cam member 186 has a pair of pin engaging wall portions 193A and 193B that come into contact with a driving pin 181 (shown by an alternate long and short dash line) disposed on a slider cam (not shown). Further, the cleaning cam member 186 is formed with a flange 195, and the cleaning arm 186 is configured to engage with the cam portion 194 formed on the cleaning cam member 186 at the lower portion of the flange 195. Has been.
[0009]
Next, the operation of the cleaning mechanism 185 will be described.
FIG. 12 shows an ejected state of the magnetic disk device (a state where the tape cassette is in a position where it is attached to and detached from the cassette holder). In this ejected state, magnetic recording / reproducing processing is not performed, so that the magnetic tape is not in contact with the capstan shaft 111. Therefore, the capstan shaft 111 is cleaned by the cleaning mechanism 185 using this ejection time.
[0010]
At the time of ejection, the drive pin 181 has moved to the limit in the direction of the arrow X2 in the figure. In this state, the cleaning arm 186 has a recessed portion 194A (small diameter with respect to the rotation center) in the cam portion 194 of the cleaning cam member 187. Is engaged). For this reason, the elastic force of the coil spring displaces in the direction of the arrow E1 in the figure, so that the cleaning unit 190 comes into contact with the capstan shaft 111, so that the cleaning process for the capstan shaft 111 is performed.
[0011]
On the other hand, when cassette loading is started, the slider cam starts to move in the direction of arrow X1, and accordingly, the drive pin 181 also moves in the direction of arrow X1. In the ejected state, the pin engaging wall portion 193 </ b> A formed on the cleaning cam member 187 is positioned on the movement locus of the drive pin 181. Therefore, the drive pin 181 engages with and presses the pin engaging wall portion 193A as it moves, whereby the cleaning cam member 187 is urged to rotate in the direction of arrow F1 in the figure.
[0012]
When the cleaning cam member 187 rotates in the F1 direction, the protruding portion 194B (portion having a large diameter with respect to the rotation center) of the cam portion 94 is engaged with the cleaning arm 186, and thus the cleaning is performed. The arm 186 is urged to rotate in the direction of arrow E2 in the figure against the elastic force of the coil spring. Accordingly, the cleaning unit 190 is separated from the capstan shaft 111, and the cleaning process for the capstan shaft 111 is completed.
[0013]
In the magnetic recording / reproducing process for the magnetic tape, since the cleaning unit 190 is separated from the capstan shaft 111, the cleaning arm 186 does not interfere with the running of the magnetic tape.
[0014]
[Problems to be solved by the invention]
Incidentally, the cleaning cam member 187 constituting the cleaning mechanism 185 as described above is disposed on the support shaft 184 provided in the chassis. In this arrangement, the pin engagement wall portions 193A and 193B formed on the cleaning cam member 187 must be positioned on the movement locus of the drive pin 181 and disposed on the support shaft 184.
[0015]
However, since the cleaning cam member 187 is a substantially cylindrical member and has a small shape, the cleaning cam member 187 is disposed at a position that is erroneously deviated from the proper position (the state shown in FIG. 12 is the proper position). Will occur.
Conventionally, when the cleaning cam member 187 is erroneously mounted on the support shaft 184 as described above, a mechanism for returning the cleaning cam member 187 to an appropriate position has not been provided. For this reason, the conventional magnetic recording / reproducing apparatus has a problem that the cleaning mechanism 185 does not function properly and the cassette loading operation cannot be normally performed due to this.
[0016]
For example, as shown in FIG. 13, when the cleaning cam member 187 is attached at a position rotated in the arrow F1 direction from the appropriate position (position shown in FIG. 12), the drive pin 181 moves in the arrow X1 direction. When the drive pin 181 is disposed at an appropriate position, the drive pin 181 does not come into contact with the pin engaging wall portion 193A that should come into contact, but comes into contact with the back side of the pin engaging wall portion 193B.
[0017]
Therefore, after the drive pin 181 moves in the arrow X1 direction, when the ejection operation is performed again and the drive pin 181 moves in the arrow X2 direction, the drive pin 181 is immediately separated from the back side of the pin engaging wall portion 193B, The cleaning cam member 187 maintains a state of being rotated in the direction of the arrow F1. That is, the cleaning arm 186 is locked at a position away from the capstan shaft 111, and the cleaning process for the capstan shaft 111 cannot be performed thereafter.
[0018]
The present invention has been made in view of the above points, and even when the cam member (cleaning cam member) is not properly disposed, the magnetic recording can automatically correct the cam member to the proper position. An object is to provide a playback device.
[0019]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, the present invention is characterized by the following measures.
The invention according to claim 1
A cleaner arm that is rotatably disposed on the chassis, and abuts against the capstan shaft as it rotates to clean the capstan shaft;
A cam member rotatably disposed on the chassis and provided with a cam portion that engages with the cleaner arm; and a cam member that rotates the cleaner arm by a displacement of the cam portion accompanying the rotation;
By moving on the chassis, the cassette holder on which the tape cassette is mounted is mounted / removed to / from a predetermined mounting position, and has a drive pin that engages with the cam member and rotates the cam member as it moves. With slider cam
In a magnetic recording / reproducing apparatus comprising:
An engaging portion is formed at a position closer to the cam member than an arrangement position of the drive pin of the slider cam;
When the cam member is at a position deviated from an appropriate position, the engaging portion is engaged with the cam member as the slider cam moves, and the cam member is rotated to the appropriate position. It is a feature.
[0020]
According to the first aspect of the present invention, even when the cam member is disposed at a position deviated from an appropriate position, the cam member is disposed at a position closer to the cam member than the position at which the drive pin is disposed as the slider cam moves. The engaged portion is first engaged with the cam member, and the cam member is rotated to an appropriate position. Thus, when the drive pin engages with the cam member, the cam member is always in an appropriate position, so that the slider cam cannot be moved and the capstan shaft cannot be cleaned. Can be prevented.
[0021]
The invention according to claim 2
The magnetic recording / reproducing apparatus according to claim 1.
The engaging portion is a bent piece formed integrally with the slider cam.
According to the second aspect of the present invention, the engaging portion can be formed easily and at low cost by configuring the engaging portion by the cut-and-raised portion formed integrally with the slider cam.
[0022]
The invention according to claim 3
The magnetic recording / reproducing apparatus according to claim 1 or 2,
An engagement portion passage portion is formed in the cam member, and the engagement portion passage portion is positioned on a movement locus of the engagement portion in a state where the cam member is located at the proper position. It is what.
[0023]
According to the third aspect of the present invention, the engaging portion engages with the cam member only when the cam member is improperly mounted, and passes through the engaging portion passage when the cam member is properly mounted. Thus, the cam member is not engaged. Therefore, even if the engagement portion is provided on the slider cam, the operation at the time of cleaning the cam member is not hindered by the engagement portion.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
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) that is 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.
[0025]
The apparatus 1 is a rotary type digital audio tape recorder (DAT) as described above, and roughly speaking, on the chassis 2, a cassette loading / unloading mechanism 3, a reel driving mechanism 4, a rotating cylinder 5, a tape loading mechanism 6, and a protection mechanism 8A. , 8B, the mode switching mechanism 20, the cleaning mechanism 85, and the like are provided.
[0026]
The reel drive mechanism 4 is a mechanism for rotationally driving the supply side reel 9 and the take-up side reel 10. The reels 9 and 10 are configured such that their rotation speed, rotation direction, and the like are controlled by the mode of the apparatus 1 (for example, recording / reproducing mode, fast forward / rewind mode, fast forward search / rewind search mode, etc.). Yes.
The rotating cylinder 5 is attached to the drum base 7. The rotating cylinder 5 is wound with a magnetic tape (not shown) drawn from the tape cassette over a predetermined angle, and performs magnetic recording / reproducing processing on the magnetic tape as the tape travels.
[0027]
The tape loading mechanism 6 is a mechanism for pulling out the magnetic tape from the tape cassette and winding it around the rotating cylinder 5 over a predetermined angle. In this embodiment, the tape loading mechanism 6 employs so-called M loading, and is driven by the mode switching mechanism 20 so that the pair of loading bases 12 and 13 are formed along the guide grooves 14 and 15 formed in the drum base 7. The magnetic tape is loaded or unloaded along with the movement. On the pair of loading bases 12 and 13, loading posts 16 and 17 and inclined poles 18 and 19 for loading the magnetic tape are erected.
[0028]
The mode switching mechanism 20 includes a mode switching gear, a link, a mode switching plate, etc. (not shown). The mode switching gear is configured to be rotationally driven by the mode switching motor 20. Further, each mechanism (cassette loading / unloading mechanism 3, tape loading mechanism 6, etc.) constituting the apparatus 1 is connected to the mode switching plate, and the mode switching motor 20 moves the mode switching plate to a predetermined mode switching position. Thus, the mode of the device 1 can be switched.
[0029]
Further, the pinch roller arm 39 is also configured to be 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 disposed on the pinch roller arm 23 moves the magnetic tape to the capstan shaft 11 a which is the rotation shaft of the capstan motor 11 (detailed in FIG. 8). Press contact. Thereby, the tape running speed and the tape running direction of the magnetic tape are controlled according to the rotation speed and the rotation direction of the capstan motor 11.
[0030]
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. The cassette loading / unloading mechanism 3 roughly includes a cassette holder 24 into which a tape cassette is inserted and loaded, a slider cam 27 that is movable on the chassis 2 in the directions of arrows X1 and X2, and a drive that moves the slider cam 27. It is comprised by the arm 70 grade | etc.,.
[0031]
The cassette holder 24 has a casing shape in which a bottom plate 45 is disposed below the pair of side guides 25 and a top plate 46 is disposed on the top, and a tape cassette is inserted and mounted in the internal space. The In addition, cassette pressing springs 47 that press the upper surface of the tape cassette inserted and mounted in the cassette holder 24 are disposed on both sides of the top plate 46. The cassette pressing spring 47 presses the tape cassette against the bottom plate 45, thereby preventing the tape cassette from rattling within the cassette holder 24.
[0032]
A cassette locking spring 48 is disposed at the center position of the top plate 46. The cassette locking spring 48 functions to lock the tape cassette in the cassette holder 24 by engaging with a locking groove formed on the upper surface of the tape cassette.
Each side guide 25 is provided with shafts 49 and 50 extending outward. The shafts 49 and 50 engage with inclined grooves 58 and 59 formed in the slider cam 27 described later, and L-shaped long holes 43 and 44 formed in the side walls 26 standing on both sides of the chassis 2. Is configured to engage. A bush 68 is interposed between the shaft 50 and the L-shaped elongated hole 44. Each bush 68 is rotatably fixed to the shaft 50 by screwing a screw 67 to the shaft 50. Yes.
[0033]
The slider cam 27 is integrally formed by press-molding a plate-like material, and has a configuration having an upper plate 55 and a side plate 56. Protect mechanisms 8A and 8B, which will be described later, are disposed on the upper plate 55, and inclined grooves 58 and 59 (cams) into which the shafts 49 and 50 provided on the cassette holder 24 are inserted and engaged with the side plate 56. ) 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 is attached is provided upright at a position near the engaged port 60.
[0034]
The movement trajectory of the cassette holder 24 is determined by inclined grooves 58 and 59 formed in the slider cam 27 and L-shaped long holes 43 and 44 formed in the side wall 26 of the chassis 2. Therefore, when the slider cam 27 is moved in the direction of the arrow X1 in the drawing by the rotation of the drive arm 70, the shafts 49 and 50 provided in the cassette holder 24 and engaged with the inclined grooves 58 and 59 of the slider cam 27 are As the cam 27 moves, it is guided by the L-shaped elongated holes 43 and 44 to move.
[0035]
As a result, the cassette holder 24 is first moved horizontally in the direction of the arrow X1 in the figure and then moved downward, and the tape cassette mounted on the cassette holder 24 is conveyed to a predetermined recording / reproducing position in the apparatus 1. Further, when the slider cam 27 moves in the direction of the arrow X2 in the figure, the cassette holder 24 performs the reverse operation to the above, and from the predetermined recording / reproducing position to the predetermined eject position (position where the tape cassette is attached to and detached from the cassette holder 24). Move to.
[0036]
As shown in an enlarged view in FIG. 6, the drive arm 70 includes a push part 72, an arm part 73, a lever part 74, an engagement part 77, and the like. The bush portion 72 has a cylindrical shape having a shaft hole 72 a at the center thereof, and is supported by a shaft 71 erected on the chassis 2. As a result, the drive arm 70 is configured to be rotatable about the shaft 71.
[0037]
The arm portion 73 extends in the horizontal direction from the upper portion of the push portion 72, and an engaging portion 77 is formed at the tip portion thereof. The lever portion 74 extends downward from the upper portion of the push portion 72, and the tip end portion 74a is bent to have an L shape. And the pin 75 is arrange | positioned at this front-end | tip part 74a so that it may protrude below.
[0038]
The pin 75 is connected to the mode switching gear of the mode switching mechanism 20 through a long hole 81 formed in the chassis 2 as shown in FIG. Therefore, when the mode switching mechanism 20 is driven, the drive arm 70 rotates about the shaft 71 in the directions indicated by arrows A1 and A2 in FIG.
Further, the engaging portion 77 formed at the distal end portion of the arm portion 73 is engaged with the slider cam 27 by being inserted through the engaged port 60. Therefore, when the drive arm 70 rotates in the direction of the arrow A1, the slider cam 27 moves in the direction of the arrow X2, and when the drive arm 70 rotates in the direction of the arrow A2, the slider cam 27 moves in the direction of the arrow X1. It is configured to move to.
[0039]
Further, when the slider cam 27 is driven by the drive arm 70, in order to prevent rattling from occurring between the engaged port 60 and the engaging portion 77, the slider cam 27 is interposed between the slider cam 27 and the engaging portion 77. Is provided with a torsion spring 80. One end portion 80 a of the torsion spring 80 is hooked on the engaging portion 77, and the other end portion 80 b is hooked on the spring hooking portion 69 of the slider cam 27. Then, the elastic force of the torsion spring 80 always presses and urges the engaging portion 77 against the edge portion of the engaged port, thereby preventing the occurrence of backlash.
[0040]
FIG. 7 is an enlarged view showing the engaging portion 77. As shown in the figure, the engaging portion 77 is made of resin and has a post portion 77a that comes into contact with the edge portion of the engaged port 60 formed in the slider cam 27 and an end portion 80a of the torsion spring 80 that comes in contact with the post portion 77a. The spring receiving portion 78 is provided. A flange 77 b is formed integrally with the post portion 77 a at the lower portion of the spring receiving portion 78, and the end portion 80 a of the torsion spring 80 is detached from the engaging portion 77 at the upper portion of the spring receiving portion 78. A detachment preventing plate 79 is provided to prevent this.
[0041]
When attention is paid to the position where the spring receiving portion 78 and the end portion 80 a of the torsion spring 80 abut, a curved concave portion 78 a is formed at the abutting position of the spring receiving portion 78. The curved recess 78 a is formed to have a shape corresponding to the cross-sectional shape of the torsion spring 80.
Thus, by forming the curved concave portion 78a corresponding to the cross-sectional shape of the torsion spring 80 in the spring receiving portion 78, the torsion spring 80 and the spring receiving portion 78 (curved concave portion 78a) are brought into surface contact and widen the contact area. be able to. Further, the torsion spring 80 is engaged with the curved recess 78a, so that the movement in the directions of the arrows C1 and C2 in the drawing is restricted. As a result, the generation of wear powder between the spring receiving member 78 and the torsion spring 80 can be suppressed, and the occurrence of adverse effects caused by the wear powder adhering to other devices can be prevented. Recording / reproduction processing can be ensured.
[0042]
Further, since the spring receiving member 78 is made of resin, the curved recess 78a corresponding to the cross-sectional shape of the torsion spring 80 can be easily formed. Furthermore, the use of a resin material with good slipperiness as the material of the spring receiving member 78 can eliminate the need for grease. Therefore, it is possible to prevent the grease from adhering to other devices, and it is possible to ensure a good magnetic recording / reproducing process.
[0043]
Next, the protect mechanisms 8A and 8B will be described. The protect mechanism 8A and the protect mechanism 8B are disposed substantially symmetrically in the vertical direction in the state illustrated in FIGS. 1 and 3A. Accordingly, the corresponding components of the protect mechanisms 8A and 8B will be described with the same reference numerals.
The protect 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, even if a foreign object other than the tape cassette is inserted into the apparatus 1 by the protect mechanisms 8A and 8B, the cassette holder 24 does not move. Thereby, it can prevent that a foreign material penetrate | invades into the apparatus 1, and can prevent the damage of the apparatus 1 by foreign material insertion.
[0044]
The protection mechanisms 8A and 8B are disposed on the upper plate 55 of the slider cam 27, and are thus configured to move in the directions of arrows X1 and X2 in the drawing as the slider cam 27 moves. The protect mechanisms 8A and 8B are generally constituted by a protector cam arm 30, a protector arm 36, first and second engaging recesses 35 and 40, and the like.
[0045]
As shown in FIG. 4 in an enlarged manner, the protector cam arm 30 has a structure in which a cassette engaging arm portion 31, a cam portion 32, a first lock piece 33, and the like are integrally formed. A shaft hole 43 a is formed in the protector cam arm 30, and the shaft hole 43 a 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.
[0046]
Further, the protector cam arm 30 has a cam portion 32, and the formation position thereof is selected as the opposite end portion with respect to the formation position of the cassette engagement arm portion 31 around the shaft hole 43a. The cam portion 32 is a concave portion having a substantially trapezoidal shape, and a follower portion 37 of a protector arm 36 to be described later is engaged with the cam portion 32. During this engagement, the driven portion 37 is configured to be displaceable within the cam portion 32.
[0047]
The first lock piece 33 is formed so as to protrude toward the side wall 26 erected on the chassis 2. This 1st lock piece 33 is comprised so that it may engage with the 1st engagement recessed part 35 formed in the side wall 26 in the unmounted state (refer FIG. 1).
On the other hand, as shown in an enlarged view in FIG. 5, the protector arm 36 has a configuration in which a driven portion 37 and a second lock piece 38 are integrally formed. A shaft hole 39 a is formed in the protector arm 36, and this 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.
[0048]
The driven portion 37 is formed to protrude so as to engage with the cam portion 32 formed on the protector cam arm 30 as described above. Further, the second lock piece 38 is formed so as to protrude 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 an unmounted state.
[0049]
The protector arm 36 has a spring hooking portion 36 a, and a coil spring 57 is stretched between the spring hooking portion 36 a and the slider cam 27. The coil spring 57 generates an elastic force that biases the protector arm 36 in the direction indicated by the arrow B1 in FIG.
Therefore, the protector arm 36 is transmitted to the protector cam arm 30 when the cam portion 32 is engaged with the cam portion 32, and the protector cam arm 30 is shown by an arrow D1 in FIG. It is urged to rotate in the direction indicated by. However, as described above, the arms 30 and 36 are configured such that further rotation is restricted when the first and second lock pieces 33 and 38 engage with the side wall 26 of the chassis 2. Yes.
[0050]
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 the normal state (inserted in the direction of the arrow X1) in the unmounted protect mechanism 8A located on the right side, the leading end of the tape cassette accompanies this insertion operation. The portion engages with and presses the cassette engaging arm portion 31. Therefore, the protector cam arm 30 rotates around the support shaft 34 against the elastic force of the coil spring 57, whereby the first lock piece 33 also rotates, and the first engagement recess 35 and the first The engagement with the lock piece 33 is released.
[0051]
In addition, when the protector cam arm 30 is rotated as described above, the cam portion 32 is also rotated, so that the protector arm 36 is also centered on the support shaft 39 via the driven portion 37 engaged with the cam portion 32. It is urged to rotate. As described above, when the protector arm 36 is rotated, the second lock piece 38 is also rotated accordingly, so that the engagement between the second engagement recess 40 and the second lock piece 38 is released. As a result, the slider cam 27 is movable with respect to the chassis 2.
[0052]
On the other hand, when the tape cassette is inserted into the cassette holder 24 in an abnormal state (for example, in a case where the tape cassette is inserted in an inclined state), the protector cam arm 30 does not rotate normally. The lock pieces 33 and 38 are kept engaged with the first and second engaging recesses 35 and 40. Therefore, the slider cam 27 is kept locked to the chassis 2.
[0053]
As described above, by providing the protection mechanisms 8A and 8B, the movement of the slider cam 27 (that is, the cassette holder 24) with respect to the chassis 2 is restricted except when the tape cassette is inserted in a normal state. Intrusion into the apparatus 1 can be prevented.
In this embodiment, a rotation restricting piece 62 for restricting the rotation of the protector arm 36 at a predetermined position is provided (detailed in FIGS. 2 and 3A). This rotation restricting piece 62 is within the rotation range of the protector arm 36 that is biased by the elastic force of the coil spring 57 (this range is also a range in which the coil spring 57 is not permanently deformed), and the protector. The cam arm 30 and the protector arm 36 are provided at a predetermined rotation position before reaching the disengagement position where the engagement is released.
[0054]
With this configuration, even if the protector arm 36 is rotated in the direction to release the engagement with the protector cam arm 30, the protector arm 36 is rotated before the engagement between the arms 30 and 36 is released. The rotation is restricted by engaging with the restriction piece 62. Therefore, by providing the rotation restricting piece 62, it is possible to reliably prevent the engagement of the arms 30 and 36 from being released. Since the rotation restricting piece 62 is formed by a cut-and-raised portion formed integrally with the slider cam 27, the number of parts is smaller than that of the structure in which the rotation restricting piece 62 is provided as a separate part on the slider cam 27. And the number of assembly steps can be reduced, so that the cost of the apparatus 1 can be reduced.
[0055]
Next, the cleaning mechanism 85 will be described mainly with reference to FIGS. 3 and 8 to 11.
The cleaning mechanism 85 generally includes a cleaning arm 86, a cleaning cam member 87, a drive pin 81, an engagement piece 82, and the like. The cleaning arm 86 is rotatably attached to a support shaft 83 provided in the capstan motor 11, and is thus configured to be rotatable in the directions indicated by arrows E1 and E2 in FIGS. .
[0056]
A blade-shaped cleaning unit 90 is formed at the end of the cleaning arm 86 in the direction of the arrow X2 in the drawing. The cleaning unit 90 contacts the capstan shaft 11a of the capstan motor 11 (shown by a one-dot chain line in FIGS. 10 and 11), thereby removing the dirt attached to the capstan shaft 11a.
[0057]
Further, a spring retaining hole 91 is provided at the end of the cleaning arm 86 in the direction of the arrow X1, and a coil spring 88 having one end connected to the chassis 2 is connected to the spring retaining hole 91 (see FIG. 8). ) Is connected to the other end. Due to the elastic force of the coil spring 88, the cleaning arm 86 is always urged to rotate in the direction of arrow E1 in the figure.
[0058]
On the other hand, the cleaning cam member 87 has a substantially cylindrical shape as shown in FIG. This cleaning cam member 87 is rotatably attached to a support shaft 84 provided in the chassis 2, and is thus configured to be rotatable in the directions indicated by arrows F1 and F2 in FIGS. .
The cleaning cam member 87 is formed with a pair of pin engaging wall portions 93A and 93B that abut on the drive pin 81 provided on the slider cam 27, and has a substantially semicircular shape in a plan view. The flange portion 95 is formed. The cleaning arm 86 is configured to engage with a cam portion 94 formed on the cleaning cam member 87 at a lower portion of the flange portion 95.
[0059]
Further, no other components are formed on the upper portion of the flange portion 95, and this portion constitutes an engagement piece passage portion 97. When the cleaning cam member 87 is properly mounted, the engagement piece passage portion 97 is configured to move the engagement piece 82 when the engagement piece 82 moves in the direction of the middle arrow X1 as the slider cam 27 moves. It is comprised so that it can pass.
[0060]
Further, a position correcting wall 96 having a shape bent inward from the outer peripheral portion is formed at a predetermined position of the cleaning cam member 87. As will be described later, the position correcting wall portion 96 has a function of rotating the cleaning cam member 87 to an appropriate position when the engaging piece 82 abuts when the cleaning cam member 87 is erroneously mounted. It is what you play.
[0061]
The engaging piece 82 is formed by bending a part of the slider cam 27 as shown in FIG. That is, since the engaging piece 82 is formed of a bent piece formed integrally with the slider cam 27, the engaging piece 82 can be formed easily and at low cost.
Further, the arrangement position of the engagement piece 82 is closer to the cleaning cam member 37 than the arrangement position of the drive pin 81 on the slider cam 27, that is, the arrow X1 in the figure relative to the arrangement position of the drive pin 81. It is formed at a position separated by a predetermined amount in the direction. Further, the arrangement position of the engagement piece 82 is configured to face the engagement piece passage portion 97 formed in the cleaning cam member 87 in a state where the cleaning cam member 87 is properly mounted.
[0062]
Next, the operation of the cleaning mechanism 85 configured as described above will be described mainly with reference to FIGS. For convenience of explanation, the operation of the cleaning mechanism 85 when the cleaning cam member 87 is properly mounted will be described first.
FIG. 10 shows an ejected state of the magnetic disk device (a state where the tape cassette is in a position where it is attached to and detached from the cassette holder). In this ejected state, the magnetic recording / reproducing process is not performed, so the magnetic tape and the pinch roller 22 are not in contact with the capstan shaft 11a. Therefore, in this embodiment, the cleaning process of the capstan shaft 11a is performed using the cleaning mechanism 85 by utilizing this ejection time.
[0063]
At the time of ejection, the drive pin 81 and the engaging piece 82 have moved to the limit in the direction of the arrow X2 in the figure. In this state, the cleaning arm 86 is a recessed portion 94A (the cam portion 94 provided on the cleaning cam member 87). A portion having a small diameter with respect to the center of rotation). Therefore, the cleaning arm 86 is displaced in the direction of the arrow E1 in the figure by the elastic force of the coil spring 88 described above, so that the cleaning unit 90 comes into contact with the capstan shaft 11a, whereby the cleaning unit 90 cleans the capstan shaft 11a. Process.
[0064]
Note that when the cleaning unit 90 contacts the capstan shaft 11a, the control device of the device 1 (not shown) rotates the capstan motor 11 for a predetermined time, so that the cleaning process is performed over the entire circumference of the capstan shaft 11a. It has become.
On the other hand, when cassette loading is started, the slider cam 27 starts to move in the direction of the arrow X1 in the figure, and accordingly, the drive pin 81 and the engagement piece 82 also move in the direction of the arrow X1 in the figure. When the cleaning cam member 87 is properly mounted, the pin engagement wall portion 93A formed on the cleaning cam member 87 is configured to be positioned on the movement locus of the drive pin 81 and is engaged. The single passage portion 97 is configured to be positioned on the movement locus of the engagement piece 82.
[0065]
Accordingly, the drive pin 81 engages with and presses the pin engaging wall portion 93A as it moves, and thereby the cleaning cam member 87 is urged to rotate in the direction of arrow F1 in the figure. When the cleaning cam member 87 rotates in the direction of the arrow F1 in this way, the protruding portion 94B (portion having a large diameter with respect to the rotation center) of the cam portion 94 is engaged with the cleaning arm 86, and thus cleaning is performed. The arm 86 is urged to rotate in the direction of arrow E2 in the figure against the elastic force of the coil spring 88. As a result, the cleaning unit 90 is separated from the capstan shaft 11a, and the cleaning process for the capstan shaft 11a is completed.
[0066]
Further, the engaging piece 82 passes through the engaging piece passing portion 97 with the movement. Therefore, when the cleaning cam member 87 is properly mounted, the engaging piece 82 does not act on the cleaning cam member 87 at all. In the magnetic recording / reproducing process for the magnetic tape, since the cleaning unit 90 is separated from the capstan shaft 11a, the cleaning arm 86 does not interfere with the running of the magnetic tape.
[0067]
Next, the operation of the cleaning mechanism 85 when the cleaning cam member 87 is improperly mounted will be described.
As described above, when the cleaning cam member 87 constituting the cleaning mechanism 85 is disposed on the support shaft 84 provided in the chassis 2, the pin engagement wall portions 93 </ b> A and 93 </ b> B are on the movement locus of the drive pin 81. It is necessary to position and arrange so as to be located in However, since the cleaning cam member 87 is a substantially cylindrical member and has a small shape, the cleaning cam member 87 may be erroneously disposed at a position deviated from an appropriate position (the state shown in FIG. 10 is an appropriate position). This is as described above.
[0068]
In the following description, as shown in FIG. 11, when the cleaning cam member 87 is disposed at a predetermined angle in the direction of arrow F1 from the proper position (position shown in FIG. 10) (incorrectly mounted). As an example, the operation of the cleaning mechanism 85 at the time of mounting will be described.
In the erroneous mounting state shown in FIG. 11, the back surface portion of the pin engaging wall portion 93 </ b> B formed on the cleaning cam member 87 is located on the movement locus of the drive pin 81, and the position correcting wall portion 96 is The engagement piece 82 is positioned on the movement locus.
[0069]
The position correcting wall 96 has a long length G (indicated by an arrow in FIG. 11). Further, when it is formed so as to protrude below the cleaning cam member 87 (see FIG. 9B), it engages with a crescent-shaped long hole 99 (see FIG. 8) formed in the chassis 2, so The rotation range of the cleaning cam member 87 is limited to the range of the long hole 99. Therefore, when the cleaning cam member 87 is erroneously attached to the support shaft 84, the position correcting wall portion 96 is necessarily positioned on the movement locus of the engagement piece 82.
[0070]
When cassette loading is started in the above-described erroneous mounting state, the slider cam 27 starts to move in the direction of the arrow X1 in the figure, and accordingly, the drive pin 81 and the engagement piece 82 also move in the direction of the arrow X1.
In the erroneous mounting state of FIG. 11, the back surface portion of the pin engaging wall portion 93 </ b> B is positioned on the movement locus of the driving pin 81. Therefore, in the configuration in which the engaging piece 82 is not provided as in the related art, the driving pin The cleaning cam member 87 once rotates in the direction of the arrow F1 in the figure by the movement of the arrow 81 in the direction of arrow 81, but after that, when the ejecting operation is performed again and the driving pin 81 moves in the direction of the arrow X2, the driving pin 81 As described above, the pin engagement wall portion 193B is immediately separated from the back side and locked.
[0071]
However, in the present embodiment, as described above, the engaging piece 82 is formed at a position closer to the cleaning cam member 37 than the position where the drive pin 81 is disposed. Therefore, in the configuration of the present embodiment, before the drive pin 81 contacts the back surface portion of the pin engaging wall portion 93B, the engaging piece 82 contacts the position correcting wall portion 96 first, and this is moved in the direction of the arrow X1. Press.
When the engagement piece 82 presses the position correcting wall portion 96 in this way, the cleaning cam member 87 rotates in the direction of the arrow F2 in the figure. This rotation direction is a direction in which the cleaning cam member 87 is directed to the proper mounting position. In the state where the engaging piece 82 pushes the position correcting wall portion 96 along with the movement in the direction of the arrow X1 in the drawing, and the engaging piece 82 is separated from the position correcting wall portion 96, the cleaning cam member 87 is properly attached. Rotate to position. Then, in the state where the cleaning cam member 87 is rotated to the proper mounting position as described above, the drive pin 81 comes into contact with the pin engaging wall portion 93A for the first time. Therefore, the processing after the drive pin 81 comes into contact with the pin engaging wall portion 93A is the same operation as described above as the operation at the time of proper mounting.
[0072]
As described above, according to this embodiment, even if the cleaning cam member 87 is disposed at a position shifted from the proper position, the cleaning cam is moved more than the position where the drive pin 81 is disposed as the slider cam 27 moves. The engaging piece 82 disposed at a position close to the member 87 is first engaged with the cleaning cam member 87 (position correcting wall 96), and the cleaning cam member 87 is rotated to an appropriate position.
[0073]
As a result, when the drive pin 81 engages with the cleaning cam member 87, the cleaning cam member 87 is always automatically in the proper mounting position, so that the slider cam 27 cannot be moved, Further, it becomes possible to reliably prevent the capstan shaft 11a from being cleaned.
[0074]
【The invention's effect】
As described above, according to the present invention, various effects described below can be realized.
According to the first aspect of the present invention, when the drive pin engages with the cam member, the cam member is always in an appropriate position, so that the slider cam cannot be moved or the capstan shaft is moved. It is possible to prevent the cleaning of the ink from becoming impossible.
[0075]
According to the second aspect of the present invention, the engaging portion can be formed easily and at low cost by configuring the engaging portion with the cut-and-raised portion formed integrally with the slider cam.
According to the third aspect of the present invention, even if the engaging portion is provided on the slider cam, the engaging portion does not hinder the operation during the cleaning of the cam member, and a reliable cleaning process is performed. Can do.
[Brief description of the drawings]
1A and 1B show a magnetic recording / reproducing apparatus according to an embodiment of the present invention, in which FIG. 1A is a plan view thereof and FIG. 1B is a front view thereof.
FIG. 2 is an exploded perspective view of a magnetic recording / reproducing apparatus according to an embodiment of the present invention.
FIGS. 3A and 3B show a slider cam provided in a magnetic recording / reproducing apparatus according to an embodiment of the present invention, FIG. 3A is a plan view thereof, FIG. 3B is a front view thereof, and FIG. It is.
FIG. 4 is a plan view of a protector cam arm provided in a magnetic recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 5 is a plan view of a protector arm provided in a magnetic recording / reproducing apparatus according to an embodiment of the present invention.
6A and 6B show a driving arm provided in a magnetic recording / reproducing apparatus according to an embodiment of the present invention. FIG. 6A is a plan view thereof, and FIG. 6B is a front view thereof.
FIG. 7 is an enlarged view showing an engagement pin of a drive arm.
FIG. 8 is an exploded perspective view for explaining an arrangement position of a cleaning mechanism provided in a magnetic recording / reproducing apparatus according to an embodiment of the present invention.
FIG. 9 is an enlarged perspective view showing a cleaning cam member constituting a part of the cleaning mechanism, (A) is a top view and (B) is a bottom view.
FIG. 10 is a diagram showing a state where a cleaning cam member is in an appropriate position.
FIG. 11 is a view for explaining a mechanism in which a cleaning cam member automatically returns to an appropriate position.
FIG. 12 is a diagram for explaining the configuration and operation of a cleaning device mounted on a magnetic recording / reproducing apparatus which is a conventional example (part 1);
FIG. 13 is a diagram for explaining the configuration and operation of a cleaning device mounted on a magnetic recording / reproducing apparatus which is a conventional example (part 2);
[Explanation of symbols]
2 Chassis
3 Cassette loading / unloading mechanism
4 Reel drive mechanism
5 Rotating cylinder
6 Tape loading mechanism
8A, 8B protection mechanism
11 Capstan motor
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 1st engagement recessed part
36 Protector Arm
37 Follower
38 Second lock piece
40 Second engaging recess
47 Cassette holding spring
57 Coil spring
60 engaged port
61 Spring mounting pin
62 Rotation restricting piece
70 Drive arm
71 shaft
72 Bush part
73 Arm
74 Lever part
75 pin
77 Engagement part
78 Spring receiving member
78a Curved recess
80 Torsion spring
81 Drive pin
82 Engagement piece
85 Cleaning mechanism
86 Cleaning arm
87 Cam member for cleaning
88 Coil spring
90 Cleaning section
93A, 93B Pin engaging wall
94 Cam
96 Wall for position correction

Claims (3)

A cleaner arm that is rotatably disposed on the chassis, and abuts against the capstan shaft as it rotates to clean the capstan shaft;
A cam member rotatably disposed on the chassis and provided with a cam portion that engages with the cleaner arm; and a cam member that rotates the cleaner arm by a displacement of the cam portion accompanying the rotation;
By moving on the chassis, the cassette holder on which the tape cassette is mounted is mounted / removed to / from a predetermined mounting position, and has a drive pin that engages with the cam member and rotates the cam member as it moves. In a magnetic recording / reproducing apparatus comprising a slider cam,
An engaging portion is formed at a position closer to the cam member than an arrangement position of the drive pin of the slider cam;
When the cam member is at a position deviated from an appropriate position, the engaging portion is engaged with the cam member as the slider cam moves, and the cam member is rotated to the appropriate position. A magnetic recording / reproducing apparatus. The magnetic recording / reproducing apparatus according to claim 1.
The magnetic recording / reproducing apparatus according to claim 1, wherein the engaging portion is a bent piece formed integrally with the slider cam. The magnetic recording / reproducing apparatus according to claim 1 or 2,
An engagement portion passage portion is formed in the cam member, and the engagement portion passage portion is positioned on a movement locus of the engagement portion in a state where the cam member is located at the proper position. A magnetic recording / reproducing apparatus.

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