JP2623754B2 - Magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called cassette type magnetic recording / reproducing apparatus using a tape cassette, and in particular, when taking out a cassette, reels until the reels in the cassette are locked. The rotation transmitting recess provided on the inner peripheral surface of the bearing hole and the rotation transmitting convex provided on the outer peripheral surface of the shaft of the reel stand are not disengaged from each other so that the tape is not removed when the cassette is taken out. To prevent loosening and prevent tape damage caused by loosening of the tape (for example, damage caused by the tape coming into contact with the front lid of the cassette or damage caused by the tape being pinched by the front lid). It is made possible.

[Summary of the Invention] The present invention includes a reel base on which a reel in a tape cassette is mounted, and a reel unlocking pin for unlocking a reel in the tape cassette. Then, when the reel of the tape cassette is mounted on the reel base (hereinafter, referred to as the time when the tape cassette is mounted), the reel unlocking pin enters the tape cassette to unlock the reel, and the tape cassette is released. When the reel of the tape cassette is released from the reel base after being ejected from the cassette mounting position (hereinafter, referred to as “tape cassette ejection”), the reel lock release pin comes out of the tape cassette to unlock the reel. In the magnetic recording / reproducing apparatus, the center of the reel base is located at the center of the reel of the tape cassette. Provided with a shaft portion fitted in a bearing hole formed,
In the axial direction of the outer peripheral surface of the shaft portion, a convex portion (drive claw) that fits into a rotation transmitting concave portion provided in the axial direction of the inner peripheral surface of the bearing hole is interposed via a spring for projecting the convex portion. When the tape cassette is mounted, the projection for transmitting rotation is slid in the compression direction of the spring against the spring force of the spring for releasing the claw when the tape cassette is mounted, and the tape cassette is ejected. In some cases, the rotation transmitting projection is slid in the tape cassette discharging direction by the spring force of the spring so that the rotation transmitting concave and projection are kept fitted until the reel is locked. The tape is not loosened when the tape cassette is ejected, and tape damage caused by loosening of the tape (damage caused by the tape coming into contact with the front lid or damage caused by the tape being caught by the front lid, etc.) ) Can be prevented beforehand.

[Prior Art] For example, a magnetic recording / reproducing apparatus such as a cassette type VTR generally has a reel 2 in a tape cassette 201 as shown in FIG.
02, a reel unlocking pin 301 for unlocking, and a reel base 302 for mounting the reel 202 in the tape cassette 201.
The reel table 302 has the tape cassette 201
A shaft portion 303 that fits in a bearing hole 210 provided in a central portion of the reel 202 is provided, and an axial direction of an outer peripheral surface of the shaft portion 303 is provided in an axial direction of an inner peripheral surface of the bearing hole 210. Rotation transmitting projection 304 (driving claw) that fits into the rotation transmitting concave 211
When the tape cassette is mounted, the reel unlock pin 301 enters the tape cassette 201 to unlock the reel 202, and when the tape cassette is ejected, the reel unlock pin 301 comes out of the tape cassette 201. Thus, the reel 202 is unlocked.

That is, a tape cassette 201 used in this type of magnetic recording / reproducing apparatus generally includes a pair of left and right reels 202, 202 for supply and take-up in a cassette housing 205 composed of upper and lower halves 203, 204. The pair of reels 20
At 2,202, a magnetic tape 206 is wound. The reel 20
2 is formed by providing upper and lower flanges 208 and 209 at the upper and lower ends of the hub 207, and has a circular bearing hole 210 formed at the center of the hub 207 and opening on the lower surface side. The inner circumferential surface of the hole 210 is provided with a plurality of rotation transmitting recesses 211... 211 at predetermined circumferential intervals.
Are formed in the axial direction. The lower end of the hub 207 is fitted into a reel base fitting hole 213 provided in the lower half 204 by being pressed and urged downward by a leaf spring 212 fixed to the inner surface of the upper half 203.

Also, the lower half 204 has a reel lock release pin introduction port 2
14 is formed, and inside the cassette housing 205,
An unlocking member 215 is provided to close the reel unlocking pin introduction port 214, and when the reel unlocking pin 301 is introduced into the cassette housing 205 from the reel unlocking pin introducing port 214, the reel unlocking pin 301 The unlocking member 215 is rotated by the
A pair of left and right reels 2 with reel lock arms 216, 216
02,202 is unlocked. The reel lock arms 216, 216 are formed in a plane U-shape as shown in FIG.
217 is provided, and the other end is provided with a pressed portion 218 pressed by the lock release member 215,
A bearing portion 219 is formed in one corner (corner portion) in the vertical direction, and a pivot shaft 22 erected on the lower half 204 in the bearing portion 219.
It is attached so that it can rotate in the horizontal direction by fitting 0. Then, a rotating force is applied by a spring 221 so that the lock claw 217 comes into contact with the peripheral surface of the reel 202 and is fitted (engaged) with concave grooves (teeth portions) 222... The rotation of the reel 202 is prevented. Further, as shown in FIG. 9, the unlocking member 215 is formed in a lateral L-shape by a horizontal plate portion 223 extending in the horizontal direction and a vertical plate portion 224 erected on the horizontal plate portion 223. In addition, a horizontal shaft 225 is provided at a continuous portion of the horizontal plate portion 223 and the vertical plate portion 224, that is, at a corner, and the shaft 225 is provided on a bearing portion 226 provided on the lower half 204. The vertical plate-like portion 224 is attached so as to be pivotable in the vertical direction by pivoting.
Abuts against the pressed portion 218 of the reel lock arm 216,
The horizontal plate portion 223 contacts the lower half 204, and the lower half 20
The reel lock release pin introduction port 214 provided at 4 is closed.

Unless the unlocking member 215 is pressed by inserting the reel unlocking pin 301 or the like into the reel unlocking pin introduction port 214, the reel 202 is kept locked by the reel lock arm 216, and the tape cassette 201 is When the playback device reaches the cassette mounting position, the tip of the reel lock release pin 301 is connected to the reel lock release pin introduction port 214.
, And comes into contact with the horizontal plate-shaped portion 223 of the unlocking member 215, and rotates the unlocking member 215 to
To press the pressed portion 218 of the reel lock arm 216, rotate the reel lock arm 216 against the spring force of the spring 221 to unlock the reel 202, and put the reel 202 in a state where the reel 202 can freely rotate. When the tape cassette is ejected, the unlocking member 215 is
Is released, the reel lock arm 216 turns the reel 2
02 is locked so that free rotation of the reel 202 is prevented.

The reel lock release timing when the tape cassette is mounted and the reel lock switching timing when the tape cassette is ejected are simultaneous, that is, when the tape cassette is mounted, the height position of the tape cassette 201 at the time when the reel lock release is completed, At the time of ejecting the cassette, the tape cassette 201 at the time when the reel lock is completed.
Height positions were the same.

By the way, in the magnetic recording / reproducing apparatus using the tape cassette 201 having the above-described reel lock mechanism, at the time of switching the reel lock, the rotation transmitting concave portion 211 and the convex portion 304 are fitted. And
There is a method in which these concave and convex portions 211 and 304 are not fitted. The former representative is the VHS method, and the latter representative is β
(Beta) method. In other words, the latter type of magnetic recording / reproducing apparatus includes a reel unlock pin 301 for unlocking the reel 202 in the tape cassette 201, and a tape cassette 2
And a reel base 302 on which the reel 202 in the tape cassette 201 is mounted.
A shaft 303 is fitted into a bearing hole 210 provided at the center of the shaft 303, and the bearing hole 2 is provided in the axial direction of the outer peripheral surface of the shaft 303.
When a tape cassette is mounted, a protrusion is fitted to a rotation transmission recess provided in the axial direction of the inner peripheral surface of the inner peripheral surface of the tape cassette.
After releasing the lock of 202, the concave and convex portions 21 for rotation transmission
1,304 are fitted to each other.

[Problems to be Solved by the Invention] In the latter type of magnetic recording / reproducing apparatus, after releasing the reel lock as described above, the rotation transmitting concave and convex portions 211 and 304 are fitted to each other. Therefore, when the shaft portion 303 fits into the bearing hole 210, the concave portion 211
When the tape cassette is ejected, there is an advantage that even if the phases of the projections 304 and the projections 304 are slightly shifted, the reels 202 to 304 rotate and the projections 304 and the projections 211 smoothly engage with each other. Since the reel lock is performed after the protrusion 304 and the projection 304 are disengaged from each other, the magnetic tape 206 is loosened due to vibration or the like from the time when the projection 304 is disengaged from the recess 211 until the reel lock is completed. Thus, there is a problem in that the magnetic tape 206 is damaged by being in contact with the front lid of the cassette or the magnetic tape 206 being pinched by the front lid. (The former method has a problem opposite to the latter method.) The present invention has been made to solve the above-mentioned conventional problems as a problem (object).

[Means for Solving the Problems] A reel lock releasing pin for unlocking a reel in a tape cassette, and a reel base on which a reel in the tape cassette is mounted, the reel base being provided with the tape cassette A shaft portion that fits in a bearing hole provided in a central portion of the reel, and a rotation transmitting recess provided in an axial direction of an inner peripheral surface of the bearing hole in an axial direction of an outer peripheral surface of the shaft portion. The magnetic recording / reproducing apparatus according to claim 1, further comprising a rotation transmitting protrusion (drive claw) fitted to the tape cassette, wherein the reel lock release pin unlocks a reel in the tape cassette when the tape cassette is mounted. An inclined surface is provided at the upper end of the tape cassette, and when the tape cassette is mounted, the convex portion is rotated by the inclined surface so as to be fitted with the concave portion, and a convex portion for rotation transmission is slidable on the shaft portion. The projection is spring-loaded in the tape cassette mounting direction by a spring for projecting the projection, and the projection for transmitting the rotation is resisted by the reel against the spring force of the spring for projecting the projection when the tape cassette is mounted. When the tape cassette is ejected, the rotation transmitting projection is slid in the tape cassette ejecting direction by the spring force of the spring, so that the rotation is transmitted until the reel is locked. Is kept in a fitted state between the convex portion and the concave portion.

[Operation] When the tape cassette is mounted, if the phase of the rotation transmitting projection on the reel base is out of phase with the rotation transmitting concave of the reel base, the rotation transmitting convex on the reel base is used. The lower end of the portion between the recesses for rotation transmission on the reel side (convex portion) hits the inclined surface on the upper end of the reel, and the projection for rotation transmission on the reel base rotates to rotate the convex portion and the projection. The positions of the rotation transmitting recesses on the reel side coincide with each other, and the rotation transmitting projections on the reel base and the reel rotation transmitting recesses are immediately fitted. When the tape cassette is ejected, the rotation transmitting projection slides in the tape cassette ejection direction by the spring force of the projection resilient spring, and remains engaged with the recess until the reel is locked. Is locked, the protrusion and the recess are disengaged. When the protrusion and the recess are disengaged, the reel is already in a locked state. It is possible to reliably prevent the magnetic tape from being loosened due to unnecessary rotation of the reel, and to prevent damage to the magnetic tape when removing the tape cassette.

Embodiment Next, the present invention will be described with reference to FIGS.

FIG. 1 is a sectional view of a main part of a magnetic recording / reproducing apparatus 1 of the present invention and a main part of a tape cassette.
And a reel base 3 on which the reel 102 in the tape cassette 101 is placed. The reel base 3 is provided with a reel 102 in the tape cassette 101. A shaft portion 4 fitted in a bearing hole 103 provided in a central portion of the shaft portion 4 is provided, and a rotation transmitting shaft provided in an axial direction of an inner peripheral surface of the bearing hole 103 in an axial direction of an outer peripheral surface of the shaft portion 4. A projection (drive claw) 5 for rotation transmission that fits into the recess 105 between the projections 104, 104 is provided, and the projection 5 is attached to the shaft 4 so as to be slidable in the axial direction. Then, the shaft portion 4 is formed by the spring 6 for projecting a coil-shaped convex portion.
Is pushed upward.

As shown in FIG. 2, the reel bases 3 are provided on two (one pair of left and right) chassis 7 corresponding to the supply side reel and the take-up side reel in the tape cassette 101, When the tape cassette is mounted, one reel base supports a supply-side reel, and the other reel base supports a take-up reel. These two reel bases are disposed below the chassis 7. The table is driven to be switched by a table drive mechanism.

A reel lock release pin (lever) 2 is provided between the pair of left and right reel stands 3 and 3. When the tape cassette is mounted, the reel lock release pin introduction port 107 provided in the lower half 106 of the tape cassette 101 is used to set the cassette. After entering into the housing 108, the inclined surface 2a at its tip presses the unlocking member 109 against the spring force of the lock spring 110, and the reel lock claw 111 locks the supply-side and take-up side reels. Is to be released. Reference numeral 112 denotes an upper half which forms the cassette housing 108 together with the lower half 106.

As shown in FIG. 1, the shaft portion 4 is formed in a cylindrical shape, and a flange 8 for preventing a convex portion is provided on the outer periphery on the upper end side, and a cap for a rotary bearing is provided on the inner periphery. A part 9 is formed. The lower end side opening is fitted to the boss 10 erected on the reel base 3 so as to be erected on the reel pedestal 3, and the front end is attached to the bearing cap part 9. Are rotated by the fitted rotation shaft 11.

As shown in FIGS. 3 to 5, the convex portions 5 are formed at three places on the outer peripheral surface of the cylindrical base portion 12 at intervals of about 120 ° in the circumferential direction. The base portion 12 is fitted to the outer periphery of the shaft portion 4 so as to be slidable with respect to the shaft portion 4. The projections 5 are formed by the spring force of a projection spring 6 interposed between the base 12 and the upper surface of the reel base 3.
The upper end of 12 is pushed up above the shaft portion 4 until it contacts the flange portion 8. The height of the upper ends of the projections 5... 5 is set such that the reel lock of the tape cassette 101 is released before the reel lock of the tape cassette 101 is released by the reel lock release pin 2 when the tape cassette 101 is lowered. Is set so as to be at a position where the lower end of the concave portion 105 is fitted.

The spring force (spring constant) of the spring 6 for projecting the convex portion is set to be smaller (smaller) than the spring force (spring constant) of the reel holding spring 113 of the tape cassette 101.
When the tape cassette is mounted, the reel 102
When the lower end of the convex portion 104 of the reel 102 and the upper end of the convex portion 5 of the shaft portion 4 come into contact with each other because the concave portion 105 and the convex portion 5 of the shaft portion 4 are out of phase, the reel 102 is locked. The convex portion 5 to the base portion 12 of the shaft portion 4 can be pressed down while being held, and the phase of the concave portion 105 and the convex portion 5 are immediately adjusted by rotating the reel base 3 after the cassette is mounted. For this reason, the convex portion 104 of the reel 102 is formed in a substantially triangular plane whose width becomes narrower toward the front end (outer peripheral side), and the lower end thereof is formed on an inclined surface 13 which is inclined upward. . The convex portion 5 of the shaft portion 4 is formed in a substantially quadrangular shape in a plane, and the upper end thereof has a central portion 14 in the radial direction.
The three inclined surfaces 15, 16, 17 in the clockwise, counterclockwise, and outer peripheral directions are formed with the boundary as the boundary.
The protrusions 5 of the shaft 4 are rotated by 4, 15 and 16, and the position of the recess 105 of the reel 102 and the protrusion 5 of the shaft 4 are immediately adjusted by the rotation of the reel base 3 after the cassette is mounted. Is to be fitted. And cassette tape 10
As 1 descends, the reel lock is released first, and then the convex portion 5 to the base portion 12 are pushed down on the upper surface of the bearing hole 103 of the reel 102 against the spring force of the spring 6 for projecting the convex portion. Reference numeral 18 denotes a reel base 3 surrounding the boss 10.
A cylindrical spring receiving cylinder erected on the upper side, a spring 6 for projecting a convex portion is mounted in the cylinder 18, and a circumferential surface of the cylinder 18 has an interval of 120 °. The grooves 19 ... 19 are formed to prevent the protrusions 5 ... 5 from being unnecessarily rotated, and to form the protrusions 5 ... 19.
5 to guide the vertical movement.

The magnetic recording / reproducing apparatus of the embodiment is configured as described above, and when the tape cassette 101 is lowered, the bearing hole of the reel 102 is formed.
The protrusion 5 is pressed down until the reel lock is released while compressing the spring 6 for projecting the protrusion on the upper surface of the 103.

Also, when the tape cassette is ejected, when the tape cassette is lifted, it is pushed up in the tape cassette ejecting direction by the spring force of the spring 6 for projecting the projection, and the concave portion 105 of the bearing hole 103 and the shaft portion are locked until the reel 102 is locked. Thus, the fitting state of the projections 5 of the fourth 4 is maintained.

[Effect of the Invention] As described above, according to the magnetic recording / reproducing apparatus of the present invention, when the tape cassette is mounted, the convex portion is rotated by the inclined surface provided at the upper end of the rotation transmitting convex portion on the reel base. Then, it is immediately fitted into the rotation transmitting recess on the reel side. When the tape cassette is ejected, the rotation transmitting projection is slid in the tape cassette ejection direction by the spring force of the projection spring, and the rotation transmission until the reel in the tape cassette is locked. After the reel is locked, the fitting of the concave and convex parts is released after the fitting state of the concave and convex parts is maintained, so that the reel locking is completed after the conventional fitting of the concave and convex parts is released. In the meantime, it is possible to reliably prevent the magnetic tape from being loosened due to vibration or the like and the magnetic tape being loosened and coming into contact with the front cover of the cassette or being damaged by being caught by the front cover. There is an effect that can be.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a main part of a magnetic recording / reproducing apparatus of the present invention and a main part of a tape cassette, FIG. 2 is a perspective view of the main part, and FIG. 3 is a plan view of a rotation transmitting projection (drive claw). Fig. 4
5 is a side view of the same, FIG. 6 is a plan view of a reel unlocking section, FIG. 7 is a cross-sectional view of a conventional example, and FIG. 8 is a plan view of the reel unlocking section. FIG. 9 is a sectional view of the same. DESCRIPTION OF SYMBOLS 1 ... Magnetic recording / reproducing apparatus, 2 ... Reel lock release pin (lever), 3 ... Reel base, 4 ... Shaft part, 5 ... Convex part (driving claw), 6 ... Spring, 101 ……
Tape cassette, 102 ... reel, 103 ... bearing hole, 105
…… Recess.

Claims (1)

(57) [Claims] A reel lock release pin for releasing a lock of a reel in the tape cassette; and a reel base on which a reel in the tape cassette is mounted. The reel base has a center of a reel in the tape cassette. A shaft portion that fits in a bearing hole provided in the portion is provided, and in the axial direction of the outer peripheral surface of the shaft portion, a rotation transmitting recess provided in the axial direction of the inner peripheral surface of the bearing hole is fitted. A magnetic recording / reproducing device provided with a rotation transmitting convex portion and releasing the lock of the reel in the tape cassette with the reel lock releasing pin when the tape cassette is mounted, wherein an inclined surface is provided at an upper end of the convex portion; At the time of mounting the tape cassette, the convex portion is rotated by the inclined surface so as to be fitted to the concave portion, and a rotation transmitting convex portion is slidably attached to the shaft portion, and the convex portion is convex. Bullet Springs in the tape cassette mounting direction with a spring for use, and when the tape cassette is mounted, the rotation transmitting convex portion is slid in the compression direction of the spring against the spring force of the spring for projecting the convex portion using the reel. At the same time, at the time of discharging the tape cassette, the rotation transmitting convex portion is slid in the tape cassette discharging direction by the spring force of the spring, and the rotation transmitting convex portion and the concave portion are engaged with each other until the reel is locked. A magnetic recording / reproducing apparatus characterized in that it is maintained.