JPH0548372B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an autoloading device which is suitably used in, for example, a magnetic tape recording/reproducing device, and which automatically inserts a cassette pack to an insertion position using a drive source. Regarding.

BACKGROUND OF THE INVENTION For example, in a magnetic tape recording/reproducing device, a power transmission mechanism that combines a plurality of gears, etc. is generally used to transmit the driving force of a motor to a mechanism that loads or ejects a magnetic tape. In a power transmission mechanism including such gears, a plurality of gears are combined so as not to rattle each other. Further, a motor generally continues to rotate due to the inertial force of the motor's rotor even after the power for driving the motor is cut off.

Problems to be Solved by the Invention Therefore, when loading or unloading a magnetic tape cassette, the continuous rotation due to the inertial force of the motor causes an excessive force to be generated, for example, between the gears of the power transmission mechanism. may come into play. Parts may be damaged by such excessive force, so in order to prevent such damage, various parts were manufactured using materials or structures with relatively high strength. . Therefore, a problem arises in that a magnetic tape recording/reproducing device using such parts becomes unnecessarily large.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, to prevent damage to various parts due to continued rotation due to the inertial force of the motor when loading a cassette bag, and to provide an autorot loading device with a compact structure. The purpose is to provide equipment.

Means for Solving the Problems The present invention provides an auto-loader that inserts a cassette bag to a complete insertion position by driving a movable piece having a locking part that engages with a reel hole of the cassette bag and pressing the locking member. a locking member having a fan-shaped driving gear at one end and engaging the moving piece at the other end to move the moving piece to the insertion completion position; a second gear that is integrally formed with the first gear and has a notch in the circumferential direction; a second gear that is coaxial with the second gear and rotatable with respect to the second gear; a third gear that is mutually displaceable in the axial direction with the second gear; the third gear is biased by a spring toward the second gear in the axial direction, and the second gear and the third gear are brought into frictional contact; The autoloading device is characterized by comprising: a spring that rotates the load; a fourth gear that meshes with the second gear and the third gear; and a drive source that rotationally drives the fourth gear.

Effects According to the present invention, for example, the drive source drives the fourth gear,
This fourth gear meshes with the second gear and the third gear.
A notch is formed in the second gear in the circumferential direction,
It is integrally formed coaxially with the first gear. Further, the third gear is coaxial with the second gear and is configured to be mutually rotatable, and can be mutually displaced in the axial direction and come into frictional contact with the second gear. Further, a spring is provided that biases the end surfaces of the second gear and the third gear that are in sliding contact with each other in a direction toward each other.

Further, the first gear meshes with a fan-shaped drive gear formed at one end of the locking member. The end portion of the locking member is engaged with a movable piece having a locking portion that engages with the reel hole of the cassette bag.

Therefore, when the fourth gear is meshing with the remaining portion of the second gear other than the notch, the power of the drive source is transmitted to the second gear via the fourth gear and the second gear.
The signal is transmitted to the first gear formed integrally with the gear, and is transmitted by the driving gear via the locking member to the locking member and further to the cassette pack, thereby driving the cassette pack. On the other hand, the driving state of the drive source is stopped with the fourth gear facing the notch of the second gear. Therefore, even if the power of the drive source continues due to inertial force even after the cassette pack reaches the insertion completion position,
This power is converted into friction between the second gear and the third gear that meshes with the fourth gear, and is absorbed.

The remaining power of the drive source therefore prevents excessive forces from acting on parts of the autoloading device and thus prevents damage to the autoloading device or the cassette pack. In addition, since the configuration for realizing such an effect can be easily realized as described above, the configuration of the autoloading device can be downsized.

Embodiment FIG. 1 is a plan view of an embodiment of the present invention, FIG. 2 is a front view of this embodiment, FIG. 3 is a right side view of this embodiment, and FIG. 4 is a front view of this embodiment. FIG. 5 is a left side view of the embodiment, FIG. 5 is a rear view of the embodiment, and FIG. 6 is an exploded perspective view of a portion of the embodiment. The configuration of this embodiment will be described with reference to these drawings. A gripping member 3 for gripping the magnetic tape cassette 2 has an upper wall 4, a side wall 5, and a lower wall 6. Upright protrusions 8 and 9 are formed on the upper wall 4 on the downstream side in the insertion direction 7 of the magnetic tape cassette 2. Locking protrusions 10 and 11 are formed upstream of these protrusions 8 and 9 in the insertion direction. A magnetic head 12 for recording and/or reproducing the magnetic tape cassette 2 held by the gripping member 3 is fixed to a chassis 13.

The swinging member 14, which can be angularly displaced with respect to the gripping member 3, has a pair of upper walls 15, 16, and a pair of upper walls 15, 16.
a connecting portion 17 connecting the two on the upstream side in the insertion direction 7;
It has a back wall 18 that connects the upper walls 15 and 16 on the downstream side in the insertion direction 7, and brackets 19 and 20 that extend downward on the downstream side of the upper walls 15 and 16 in the insertion direction 7. The brackets 19 and 20 are formed with pivots 21 and 22 which are pivotally supported on the chassis 13 so as to be angularly displaceable, and an insertion hole 23 is formed upstream of the pivot 22 of the bracket 20 in the insertion direction 7. Upper wall 1
5 and 16 on the upstream side in the insertion direction 7, there are engagement holes 24,
25 are formed, and the rising protrusions 8 and 9 fit into these engagement holes 24 and 25.

Engagement protrusions 26 and 27 formed on the most upstream side in the insertion direction of the upper walls 15 and 16 fit between the locking protrusions 10 and 11 and the upper wall 4, and It is located at the bottom of the diagram. This allows the upper wall 1
When 5, 16 are in a horizontal position, the upper wall 4 of the gripping member 3 is also kept in a horizontal position. Further, when the upper walls 15 and 16 of the swinging member 14 are angularly displaced around the pivot shafts 21 and 22 so that the gripping member side faces downward, the gripping member 3 is connected to the engagement holes 24 and 25 and the rising protrusions 8 and 9. Angular displacement is possible around an axis perpendicular to the insertion direction 7 connecting the two.

The moving piece 28 is connected to the upper walls 15 and 16 of the swinging member 14.
A guide groove 3 that fits into a guide hole 29 formed between
0,31 and the upper wall 15,1.
6 and a hanging portion 33 which hangs down below 6, and a guide shaft 34 which is specially mentioned above. Drooping part 33
can come into contact with the downstream end of the magnetic tape cassette 2 in the insertion direction 7.

A guide shaft 34 formed in the movable piece 28 fits into a long hole 37 formed in an arm 36 of the locking member 35 . A shaft hole 38 is formed on the opposite side of the arm 36 from the elongated hole 37 . The base 3 of this locking member 35
9 is connected to the arm 36 by a connecting portion 40 that hangs down from the arm 36, and a shaft hole 41 is formed in the base 39 coaxially with the shaft hole 38. A driving gear 44 and a torsion spring 45 are inserted in this order between the shaft holes 38 and 41 to drive a pivot 42, a shaft member 43, and a locking member 35, which are provided upright on the chassis 13, as will be described later. Configuration is mediated.

FIG. 7 is a plan view of the drive gear 44, and FIG. 8 is a sectional view taken along the section line - in FIG. The configuration of the drive gear 44 will be described with reference to FIGS. 6 to 8. That is, the pivot 42 is inserted through the insertion hole 46 formed along the axis of the shaft member 43, and this shaft member 43 is inserted into the drive gear 44 through the shaft member 4.
It is inserted through an insertion hole 48 formed in a diameter corresponding to the large diameter portion 47 of No. 3. The drive gear 44 has a cylindrical portion 49,
a meshing part 50 that is formed integrally with the cylinder part 49, extends in the radial direction with respect to the axis of the cylinder part 49, and has a circumferential length and a predetermined number of teeth in the circumferential direction; A locking piece 51 integrally formed and protruding downward in the position shown in FIG.
including.

Referring again to FIGS. 1 to 6, the torsion spring 45 is wound around the cylindrical portion 49 of the driving gear 44, and one end 52 of the torsion spring 45 is connected to the base 39 of the locking member 35. The locking member 3 comes into contact with a locking protrusion 53 erected at the end opposite to the shaft hole 41 of the locking member 3.
5 is biased by a spring around the axis of the shaft hole 38 in a counterclockwise direction (direction of arrow A1) in FIG. Further, the other end 54 of the torsion spring 45 comes into contact with the locking piece 51 of the drive gear 44, thereby biasing the drive gear 44 clockwise in FIG. 1 (in the direction of arrow A2). Further, the locking member 35 is angularly displaceable around the axis of the shaft hole 38, and the drive gear 44 is angularly displaceable around the axis of the insertion hole 48.

At both ends along the longitudinal direction of the approximately L-shaped drive lever 55, there are a fitting protrusion 56 that is fitted into the insertion hole 23 of the swinging member 14 so as to be freely angularly displaceable, and a sliding protrusion that is a follower as described later. 57 are provided so as to protrude in a common direction. Further, a fitting hole 59 is formed in the bent portion of the drive lever 55, into which a pivot shaft 58 provided in the chassis 13 and extending to the right in FIG. 1 is fitted.
Further, a damping mechanism 61 having a cam groove 60 corresponding to the sliding protrusion 57 which is a follower is arranged.

9 is an exploded perspective view of the damping mechanism 61, FIG. 10 is a plan view of the damping mechanism 61, FIG. 11 is a cross-sectional view taken along the section line XI-XI in FIG. FIG. 12 is a cross-sectional view of the configuration including the first and second gears 62 and 63 integrally, as seen from the section line XII-XII in FIG. 10. Figures 6 and 9 to 1
The configuration of the damping mechanism 61 will be described with reference to FIG. The damping mechanism 61 is integrally formed coaxially with a first gear 62 having a diameter D1 and teeth formed by a predetermined circumferential length L1, and has a diameter D2 D1<D2. ...(1) and includes a second gear 63 in which a notch 64 having a predetermined circumferential length L2 is formed. The shaft portion 6 is located on the opposite side of the second gear 63 from the first gear 62.
5 protrudes, and the shaft portion 65 includes a large diameter cylindrical portion 66 and a small diameter cylindrical portion 67. A fitting protrusion 68 is formed at a predetermined position in the circumferential direction of the small diameter cylindrical portion 66 so as to protrude up to the diameter of the large diameter cylindrical portion 66 . Also, this first gear 6
2. A pivot (not shown) fixed to the chassis 13 or the like is inserted into the second gear 63 and the shaft portion 65, and an insertion hole 69 is provided to rotatably hold the first gear 62, the second gear 63, etc. It is formed. Further, an annular sliding contact portion 70 is formed on the surface of the second gear 63 on the shaft portion 65 side over the entire circumference.

Further, a third gear 72 is disposed, which has a shaft hole 71 that is rotatably fitted into the large-diameter cylindrical portion 66 of the shaft portion 65, and has the same diameter and number of teeth as the second gear 63.
The shaft portion 65 passes through the shaft hole 71 of the third gear 72 and is fitted into the fitting hole 74 of the cam member 73. That is, the shape of the fitting hole 74 corresponds to the shape of the shaft portion 65, and therefore, the fitting protrusion 68 of the shaft portion 65 is fitted into the fitting hole 74, and the fitting protrusion 68 of the shaft portion 65 is fitted into the fitting hole 74. A locking recess 75 is formed in which the second gears 62 and 63 lock against the cam member 73 so that they do not rattle. Further, when the shaft portion 65 is fitted into the fitting hole 74, the step portion 76 between the large diameter cylindrical portion 66 and the small diameter cylindrical portion 67 of the shaft portion 65 corresponds to the step portion 76 of the fitting hole 74. portion 77 , and the shaft portion 65
This prevents the inside of the fitting hole 74 from shifting downward in FIG.

The axial length L3 of the large diameter cylindrical portion 66, the thickness L4 of the sliding contact portion 70, and the thickness of the third gear 72.
L5 and the ninth portion of the cam member 73 from the stepped portion 77.
The height L6 to the upper surface of the figure is selected so that the following formula holds.

L3>L4+L5+L6...(2) Therefore, the third gear 72 is the large diameter cylindrical portion 6 of the shaft 65.
6 and can be displaced in its axial direction.
The sliding contact portion 7 of FIG. 9 of such a third gear 72
A spring 80 is provided that elastically presses the sliding surface 78, which is the surface facing the sliding surface 78, against the sliding surface 79, which is the surface facing the sliding surface 78 of the sliding portion 70. The spring 80 is housed in a housing groove 81 provided around the entire circumference of the fitting hole 74 of the cam member 73.
Such a configuration allows the third gear 72 to come into frictional contact with the second gear 63.

A pivot shaft 82 is fixed to the lower surface of the upper wall 15 of the swinging member 14 in FIG. 6, and a locking lever 84 having a shaft hole 83 that fits into the pivot shaft 82 from below is arranged. The locking lever 84 has a metal plate shape, for example, and has a connecting portion 8 extending parallel to the upper wall 15.
5, and a locking piece 86 is formed in the connecting portion 85 on the upstream side in the insertion direction 7, bent in a direction intersecting the longitudinal direction of the connecting portion 85, and abutting against the chassis 13 from above in FIG. A locking protrusion 88 that fits into a fitting hole 87 formed in the upper wall 15 of the swinging member 14 is formed at the connecting portion between the connecting portion 85 and the locking piece 86 .

A plate-shaped driving part 89 that hangs downward in FIG. 6 is integrally formed on the downstream side of the linking part 85 in the insertion direction 7. Furthermore, a locking protrusion 91 is formed at a connecting portion between the connecting portion 85 and the driving portion 89 to fit into a fitting hole 90 formed at a position different from the fitting hole 87 in the upper wall 15 . That is, the locking protrusion 8
By fitting the locking levers 8 and 91 into the fitting holes 87 and 90, the locking lever 84 is prevented from falling off the pivot shaft 82. In addition, the locking lever 84
In the connecting portion 85 of , near the downstream end in the insertion direction 7, the locking lever 84 is angularly displaced around the axis of the shaft hole 83 in the clockwise direction in FIG. 1 (in the direction of arrow B1 in FIG. 6). A spring 92 is provided to bias the spring so as to do so. The bracket 19 of the swinging member 14 is also provided with a spring 93 that biases the swinging member 14 so as to angularly displace the swinging member 14 in the clockwise direction in FIG. 4 (in the direction of arrow B2 in FIG. 6).

One end 96 of a torsion spring 95 is fixed to a support shaft 94 that projects upward from the upper wall 15 of the swinging member 14 in FIG. The other end 98 of the torsion spring 95 is fixed in the hole 97 . This twisting spring 95
spring biases the support shaft 94 and the fitting hole 97 in directions away from each other. As a result, the movable piece 28 is resiliently displaced between two stable positions: a position where the displacement ends in the upstream direction in the insertion direction 7 and a position where the displacement ends in the downstream direction.

A rotating shaft 99 that drives the magnetic tape (not shown) of the magnetic tape cassette 2 is transmitted with power from a motor 100 and is driven to rotate. Further, a worm 102 is attached to the output shaft of a motor 101 serving as a power source, and meshes with a worm wheel 103 .
A reduction gear 104 is provided above the worm wheel 103 (in the direction toward the front of the paper in FIG. 1), integrally and coaxially with the worm wheel 103. Below the gear 105 that meshes with this reduction gear 104 (first
A fourth gear which meshes with the first and second gears 62 and 63 of the damping mechanism 61 (toward the back side of the drawing)
Gears 106 are fixed integrally and coaxially. Here, the damping mechanism 61 and the fourth gear 106 constitute a power transmission device. Further, a loading detection switch 107 for detecting the insertion state of the magnetic tape cassette 2 into the magnetic tape deck 1 is connected to the locking piece 5 of the drive gear 44.
It is arranged so that conduction/cutoff occurs at 1.

The operation of this embodiment will be described below with reference to FIGS. 1 to 6.

(1) In the state before the magnetic tape cassette 2 is inserted, the movable piece 28 is at the displacement end position on the upstream side in the insertion direction 7 of the magnetic tape cassette 2, and is stabilized by the spring force of the torsion spring 95. ing. Therefore, the locking member 35 is angularly displaced in the direction of arrow A1 in FIG. 1 and is in a stable state. At this time, the driving gear 44 has its meshing portion 50
The vicinity of the upstream end in the direction of the arrow A1 meshes with the vicinity of the downstream end of the first gear 62 of the damping mechanism 61 in the rotational direction C1. Further, the motor 101 is not driven, and the locking member 35 is fixed at the above position.

Further, the swinging member 14 is in a state of being angularly displaced around the axes of the pivots 21 and 22 in the direction opposite to the arrow B2 direction, and is maintained parallel to the chassis 13 together with the gripping member 3. At this time, the locking lever 84 is angularly displaced around the axis of the shaft hole 83 in the direction of arrow B1 due to the spring force of the spring 92.
The locking piece 86 is in contact with the chassis 13 from above, so that the swinging member 14 is
Angular displacement in the direction of arrow B2 around the axis of B2 is prevented.

FIG. 13 is a developed view of the cam member 73 in the circumferential direction. With reference to FIGS. 6 and 9 together,
The state of the cam member 73 will be explained. The cam member 73 is continuous with a first cam surface 108 having the same height in the axial direction and one end in the circumferential direction of the first cam surface 108, and extends in a direction away from the third gear 72 (first
a second cam surface 109 inclined downward (in FIG. 3);
Continuing from the second cam surface 109, the first cam surface 1
A third cam surface 110 formed at the same height on the lower side in the axial direction than 03, and a third cam surface 110
and a fourth cam surface 111 that is continuous with and slopes upward.

In the cam member 73 having the above-described configuration, the sliding protrusion 57 which is the follower of the drive lever 55 is located at one end position 112 of the cam groove 60.
The vehicle is stopped at a rest position 113 that is a length l1 away from the vehicle.

As the magnetic tape cassette 2 is pushed in in the insertion direction 7, the insertion direction 7 of the magnetic tape cassette 2
The downstream end presses the moving piece 28 in the direction of arrow 7. At this time, a locking portion 114 formed at the end of the movable piece 28 in the direction opposite to the direction of the arrow 7 so as to protrude toward the magnetic tape cassette 2 is connected to the reel hole of the magnetic tape cassette 2 on the downstream side in the direction of the arrow 7. They fit together and are fixed to each other. Along with this, the locking member 35 is angularly displaced around the axis of the shaft hole 38 in the direction opposite to the arrow A1 direction, and the locking protrusion 53 of the locking member 35 is moved toward the loading detection switch 10.
7 to start the motor 101.

The power of the motor 101 is powered by a worm 102, a worm wheel 103, a reduction gear 104, and a gear 10.
5 and the fourth gear 106 in this order,
Second and third gears 63 and 72 of damping mechanism 61
transmitted to. At this time, the notch 64 of the second gear 63 faces to the right in FIG.
rotationally driven in the direction. Therefore, the first gear 6
2 meshes with the meshing portion 50 of the drive gear 44, and angularly displaces it around the axis of the shaft hole 38 in a direction opposite to the arrow A1 direction. Therefore, the pressing portion 115 of the drive gear 44 presses the locking portion 116 of the locking member 35, and angularly displaces the locking member 35 in the direction opposite to the arrow A1 direction.

With this angular displacement, the movable piece 28 to which the guide shaft 34 is fixed, and therefore the inserted magnetic tape cassette 2, are pulled in the direction of arrow 7. When the angular displacement of the locking member 35 further progresses, the hanging portion 33 of the movable piece 28 moves to the locking lever 8.
4 in the insertion direction 7, the locking lever 84 is angularly displaced around the axis of the shaft hole 83 in the direction opposite to the arrow B1 direction, that is, in the counterclockwise direction in FIG. Due to this angular displacement, the locking piece 8
6 and the chassis 13 are disengaged from each other.

After the loading detection switch is activated, the sliding protrusion 57, which is the follower of the drive lever 55, is
The first cam surface 108 of the cam member 73 is moved to the stop position B.
1 to the end of the first cam surface 108 in the direction of arrow C2, and therefore the pivot shaft 2 of the swinging member 14
No angular displacement about the axes 1 and 22 has occurred.

The sliding protrusion 57 continues from the first cam surface 108,
It slides on the second cam surface 109. At this time, the sliding projection 57 is displaced downward in FIGS. 6 and 13, and therefore the drive lever 55 is angularly displaced around the axis of the fitting hole 59 in the direction of arrow D1. Therefore, the fitting protrusion 56 of the drive lever 55 and the swinging member 14 connected through the insertion hole 23 are angularly displaced in the direction opposite to the direction of arrow B2 in FIG.
The locking piece 86 of the locking lever 84 is in a floating state from the chassis 13.

During this period, the sliding protrusion 57 moves on the third cam surface 1.
10, and therefore the locking piece 8
6 and the chassis 13 can be easily disengaged with a relatively small force.

At this point, when the sliding protrusion 57 reaches the vicinity of the end of the third cam surface 110 in the direction of arrow C2,
The locking member 35 continues to be displaced in one direction and the opposite direction, and therefore the meshing portion 50 of the drive gear 44
passes through the upstream end of the first gear 62 in the direction of arrow C1, and the mutual meshing state is released. Therefore, the subsequent angular displacement of the damping mechanism 61 is not transmitted to the drive gear 44. On the other hand, the locking member 35 is maintained in a stable state at the displacement end position on the downstream side in the insertion direction 7 by the torsion spring 95.

Next, the sliding protrusion 57 moves on the third cam surface 111. At this time, the spring 93 causes the arrow B to
A sliding protrusion 57 of a drive lever 55 connected to a swinging member 14 that is spring-biased in two directions.
gradually moves upward in FIGS. 6 and 13 along the fourth cam surface 111 due to the spring force of the spring 93 and the like. Therefore, the drive lever 5
5 is angularly displaced in the direction of arrow D2 around the axis of the fitting hole 59, and accordingly, the swinging member 14 is angularly displaced in the direction of arrow B2. Near the end position of this angular displacement, the loading detection switch 107 activates the swinging member 14.
The magnetic head 12 comes close to and comes into contact with the magnetic tape of the magnetic tape cassette 2 or 7.

On the other hand, as described above, the gripping member 3 is attached so as to be freely angularly displaceable along the axis connecting the swinging member 14 and the engagement holes 24 and 25, and therefore is housed in the gripping piece 3 and is attached to the movable piece 28. The magnetic tape cassette 2 fixed by the locking part 114 can be displaced downward while maintaining the horizontal state, so that the magnetic tape of the magnetic tape cassette 2 can face the magnetic head 12. .

The sliding protrusion 57 moves the fourth cam surface 111 toward the arrow C2.
When the second gear 63 passes in the direction and comes into contact with the lower surface of the third gear 73 between the stop portion 117 of the cam member 73 and the third gear 73, the notch 64 of the second gear 63 is in a state facing the fourth gear 106. Therefore, the driving force of the fourth gear 106 is transmitted to the second gear 63, and the fourth gear 106 is in mesh with only the third gear 72. At this time, the magnetic tape cassette 2 housed in the gripping member 3 is in a downwardly displaced working position, and the swinging member 14 is elastically biased in the direction of arrow B2 by the spring force of the spring 93. Therefore, the gripping member 3, and therefore the magnetic tape cassette 2, are maintained in a stable state without wobbling at the displacement end position.

Therefore, the music signals stored on the magnetic tape of the magnetic tape cassette 2 are transferred to the magnetic head 1.
For example, even when playing by 2,
It is possible to reduce wow and flutter in the reproduced sound, and to prevent the magnetic tape from undesirably vibrating and causing chattering noise.

As mentioned above, the storage protrusion 57 is located on the fourth cam surface 1.
11, the electric power that was energizing the motor 101 may be cut off. In such a case, even if the motor 101 continues the previous driving state due to inertia, the fourth gear 106 and the second gear 63 have been disengaged as described above, so this driving The force is not transmitted to the second gear 63 and is transmitted to the fourth gear 10.
6 rotates only the third gear 72. As explained with reference to FIG. 9, the third gear 7
2 is the sliding surface 7 of the second gear 63 by the spring 80.
Therefore, the driving force due to the inertia of the motor 101 is converted into frictional heat due to the frictional contact between the second gear 63 and the third gear 72, and the driving force is attenuated. 10
1 can be stopped without unnecessarily applying excessive force to any component to which the driving force of motor 101 is transmitted.

On the other hand, since the second gear 72 has been disengaged from the drive gear 44, it is angularly displaced in the direction of arrow C1 in the same way as the third gear 72 due to the frictional contact with the third gear 72. , the stop portion 117 of the cam member 73, which is integrally formed with the second gear 63, comes into contact with the sliding protrusion 57, causing the second gear 63 to undergo unnecessary angular displacement and mesh with the fourth gear 106 again. Prevented.

(2) Next, when trying to eject the magnetic tape cassette 2 from the magnetic tape deck 1, for example, press an ejection start button (not shown) to move the magnetic head 12 out of contact with the magnetic tape of the magnetic tape cassette 2. and move the motor 101 to the
The fourth gear 1 is rotated in the opposite direction to the case of (1).
06 in the counterclockwise direction (direction of arrow D4) in FIG. As mentioned above, the third gear 72 meshing with the fourth gear 106 is rotationally driven in the clockwise direction (arrow C2 direction) in FIG. The second gear 63 is also angularly displaced in the same direction, and the second gear 63 is again connected to the fourth gear 106.
and starts angular displacement in the direction of arrow C2.

Here, the third gear 63 may have a circumferential groove 119 formed therein, as shown in FIGS. 6 and 10. Therefore, the second gear 3 corresponding to the circumferential groove 119 can elastically bend radially inward, and can easily start meshing with the fourth gear 106.

At this time, when the sliding projection 57 moves in the direction of arrow C1 along the fourth cam surface 111, the sliding projection 57 moves along the fourth cam surface 111 in the direction of arrow C1.
7 is displaced downward in FIGS. 6 and 13, and therefore the drive lever 55 is angularly displaced around the axis of the fitting hole 59 in the direction of arrow D1. Along with this angular displacement, the fitting protrusion 56 of the drive lever 55
The swinging member 14, which is connected to the through hole 23, is angularly displaced in the direction opposite to the arrow B2 direction,
The gripping member 3 containing the magnetic tape cassette 2 is lifted upward.

At the stage when the sliding protrusion 57 reaches the third cam surface 112, the first gear 62 meshes with the drive gear 44,
The drive gear 44 is angularly displaced around the axis of the shaft hole 38 in the counterclockwise direction (arrow A1 direction) in FIG. Therefore, the movable piece 28 connected to the locking member 35 by the guide shaft 34 is moved in the opposite direction to the insertion direction 7, so that the locking lever 84 is inserted into the drive part 89 in the direction 7. is released, and the locking lever 84 is released from the spring 92.
The spring force causes an angular displacement in the direction of arrow B1.
Such an operation is performed while the sliding protrusion 57 is sliding on the third cam surface 110, so that the locking piece 86 of the locking lever 84 is engaged with the chassis 1.
3 and moves away from the chassis 13.

When the sliding protrusion 57 passes the second cam surface 109, the sliding protrusion 57 is displaced upward in FIGS. 6 and 13, and the swinging member 14 is therefore moved in the direction of arrow B2 by a predetermined angular displacement amount. The locking piece 86 of the locking lever 84 can be reliably engaged with the chassis 13.

Next, after the sliding protrusion 57 reaches the first cam surface 108, the angular displacement of the locking member 35 in the A1 direction is continued, and the downstream end of the magnetic tape cassette 2 in the insertion direction 7 is 28 hanging part 33
It continues to move in the insertion direction 7 and the release direction. If this movement continues, the loading detection switch 107 is shut off, for example, and the motor 101
The drive power to is cut off. At this time, moving piece 2
8 is elastically displaced toward the upstream side in the insertion direction 7 by the spring force of the spring 95, and is brought into a stable state at the displacement end position. In this way, the magnetic tape cassette 2 is ejected in a direction opposite to the insertion direction 7, and the moving piece 28 stops at the end position of the guide hole 29 of the swinging member 14 in the direction opposite to the insertion direction 7.
In this way, the ejection operation of the magnetic tape cassette 2 is completed.

On the other hand, even if the energizing power to the motor 101 is cut off once the above-described ejection operation of the magnetic tape cassette 2 is completed, the motor 101 continues to be driven by the inertia of the rotor. There may be cases where Such driving force is transmitted to the second gear 63 via the fourth gear 106, and angularly displaces the second gear 63 in the direction of arrow C2 as described above, so that it meshes with the fourth gear 106. The drive gear 44 is angularly displaced in the direction of arrow A1, but the drive gear 44 can be angularly displaced independently of the locking member 35 as described with reference to FIG.

Therefore, in such a case, the driving gear 44 is angularly displaced in the direction of arrow A1 against the spring force of the torsion spring 45 while the locking member 35 is stopped at the position where the displacement in the direction of arrow A1 ends. Ru. That is, the driving force caused by the inertial force of the motor 101 is resolved by making the torsion spring 45 do work, and as the driving force of the motor 101 attenuates, the spring force of the torsion spring 45 increases The driving force is exceeded, the pressing portion 115 of the driving gear 44 is displaced so as to come into contact with the locking portion 116 of the locking member 35, and the driving state of the motor 101 is stopped.

The present invention is not only implemented in a magnetic tape deck 1 using a magnetic tape cassette 2, but also
It can be widely implemented in conjunction with various devices using other types of recording media.

In the third gear 63, the circumferential groove 1
19 and the notch 64, a circumferential groove similar to that of the third gear 63 on the opposite side in the circumferential direction may be formed.

Furthermore, by using the configuration of the above-described embodiment, as described in the case (1) above, it is possible to maintain the arrangement of the locking member 35, etc., in the state before the magnetic tape cassette 2 is inserted. Even if an attempt is made to insert the magnetic tape cassette 2 while the motor 101 is not being driven, the magnetic tape cassette 2 will be elastically ejected to the outside due to the spring force of the torsion springs 95 and 45. This can prevent incorrect operations.

Effects As described above, according to the present invention, even if the power of the drive source continues due to inertia force even after the cassette pack reaches the insertion completion position, this power is transferred to the fourth gear. is converted into friction and absorbed between the meshing third gear and second gear, so excessive force may not be applied to each part of the autoloading device due to the remaining power of the drive source. be prevented,
Therefore, damage to the autoloading device or the cassette pack can be prevented, and the mechanism for achieving this effect can be downsized.

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the present invention, Fig. 2 is a front view of the embodiment, Fig. 3 is a right side view of the embodiment, and Fig. 4 is a left side view of the embodiment. 5 is a rear view of this embodiment, FIG. 6 is an exploded perspective view of a portion of this embodiment, FIG. 7 is a plan view of the drive gear 77, and FIG. 8 is seen from the cutting plane line - of FIG. 7. Cross section, No. 9
10 is a plan view of the damping mechanism 61, FIG. 11 is a sectional view taken along the section line XI-XI in FIG. 10, and FIG. 12 is a first gear 6.
2 and a cross-sectional view of the configuration related to the second gear 63,
FIG. 13 is a developed view in the circumferential direction of the cam member 73 showing the cam surfaces 108 to 111 provided on the damping mechanism 61. DESCRIPTION OF SYMBOLS 1... Magnetic tape deck, 2... Magnetic tape cassette, 3... Gripping member, 7... Insertion direction, 8,
9... rising protrusion, 13... chassis, 14...
... Swinging member, 21, 22 ... Pivot, 23 ... Insertion hole, 24, 25 ... Engagement hole, 28 ... Moving piece, 2
9... Guide hole, 33... Drooping part, 34... Guide shaft, 35... Locking member, 55... Drive lever, 5
6... Fitting protrusion, 57... Sliding protrusion, 61... Damping mechanism, 62... First gear, 63... Second gear,
64... Notch, 72... Third gear, 73... Cam member, 78, 79... Sliding surface, 84... Locking lever, 86... Locking piece, 95... Torsion spring, 1
01... Motor, 106... Fourth gear, 108...
...First cam surface, 109... Second cam surface, 110...
...Third cam surface, 111...Fourth cam surface.

Claims (1)

[Scope of Claims] 1. An autoloading device that inserts a cassette pack to a complete insertion position by driving a movable piece having a locking portion that engages with a reel hole of the cassette pack and presses the locking member. a locking member having a fan-shaped drive gear at one end and whose other end engages with the movable piece to move the movable piece to the insertion completion position; a first gear meshing with the drive gear; , a second gear that is integrally formed with the first gear and has a notch in the circumferential direction; and a second gear that is coaxial with the second gear and rotatable with respect to the second gear, and that is axially connected to the second gear. a third gear that is mutually displaceable; a spring that biases the third gear toward the second gear in the axial direction to bring the second gear and the third gear into frictional contact; An autoloading device comprising: a fourth gear that meshes with the second gear and the third gear; and a drive source that rotationally drives the fourth gear.