JP2002100089A - Cassette positioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decrease the number of parts and the number of production processes in a cassette positioning device. SOLUTION: The bottom surface 12 of a chassis is bent at a right angle to the cassette loading slot for forming a positioning part 131. When a cassette is carried by a cassette holder, an engagement hole 137 of the cassette faces the part 131, slides the front-back sloping part of the part 131 and stops at a prescribed position of the sloping part. Thus, the cassette is horizontally and vertically positioned. As the part 131 is formed by bending the surface 12, both numbers of parts and production processes can be decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cassette positioning device for positioning a tape cassette at the end of loading in a magnetic recording / reproducing apparatus such as a video tape recorder.

[0002]

2. Description of the Related Art Conventionally, VTR (Video Tape Recorder)
In some cases, a front loading method is adopted in which a tape cassette is inserted substantially horizontally from the front surface of a housing and loaded. In the front loading method, when a tape cassette is inserted into the cassette holder from the front of the housing, the cassette holder moves to the tape loading device, and the cassette tape is loaded into the tape loading device. When the tape cassette is set at a predetermined position, the tape in the tape cassette is pulled out by the tape loading device.

In the helical scan system, a tape drawn from a tape cassette is wound around a cylinder. That is,
The tape loading device has a pair of tape pull-out members (hereinafter, referred to as sliders) that pass from near the tape cassette to near one end of the cylinder and move to near the other end of the cylinder. And the tape is wound around the cylinder. As a result, recording and reproduction on the tape can be performed.

Incidentally, the cassette holder moves along a guide groove provided in a guide plate of the chassis. That is, a guide post is provided on the bracket of the cassette holder at the front and rear, and the guide post is inserted into two guide grooves provided on the guide plate and slid to enable horizontal transfer of the cassette holder. ing.

The cassette holder is driven in a horizontal direction along a guide groove by an arm assembly for transmitting the rotational force of a loading motor. Further, the arm assembly transfers the cassette holder vertically along the guide groove,
Mount the cassette on the reel base. In this case, the cassette is pressed against the reel base by a torsion spring provided on the arm assembly.

At the end of cassette loading, it is necessary to determine the position and height of the tape cassette. For this positioning and height determination, a post member is attached to the bottom surface of the chassis.

[0007]

As described above, conventionally, in order to determine the position and height of the tape cassette at the end of cassette loading, it is necessary to attach a post member to the bottom surface of the chassis. In addition, there is a problem that an operation of mounting the post member is required.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and the number of components is reduced by bending a bottom surface of a chassis to be a member for determining the position and height of a tape cassette. It is an object to provide a cassette positioning device capable of reducing the number.

[0009]

According to a first aspect of the present invention, there is provided a cassette positioning apparatus in which the reel base is mounted for positioning a cassette transported by a cassette transport mechanism for mounting the cassette on the reel base. And a positioning portion formed by bending a bottom surface of the chassis to be formed.

In the first aspect of the present invention, the cassette is mounted on a reel base by a cassette transport mechanism. When the cassette is mounted on the reel base, the positioning of the cassette is performed by a positioning portion formed by bending the bottom surface of the chassis.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view of a magnetic recording / reproducing device in which a cassette positioning device according to an embodiment of the present invention is incorporated, as viewed from above. FIG. 2 shows FIG.
FIG. 2A is an explanatory view showing the cassette holder removed from FIG. 2, FIG. 2A is a view seen from above, and FIG.
It is the figure seen from the A direction side of (a). 3 is an explanatory diagram showing FIG. 1 viewed from another direction, FIG. 3 (a) is a diagram viewed from the back, and FIG. 3 (b) is a diagram viewed from the side in the direction B in FIG. 3 (a). FIG. FIG. 4 is a side view showing the positioning portion 131 in FIG. 1 in detail.

In FIGS. 1 to 3, the chassis 11 comprises
It has a bottom surface 12 and both side surfaces (guide plates) 13 and 14, and a cylinder 22 is arranged on the bottom surface 12. The cylinder 22 is provided rotatably with a predetermined inclination angle with respect to the chassis 11.

In a tape cassette (not shown), a supply hub and a take-up hub (not shown) are provided, and the tape is wound around these hubs to be stored. On the chassis 11, a supply reel table 23 and a take-up reel table 2 are provided.
4 is rotatably mounted on a shaft implanted on the chassis 11, and the cassette loading hub and the take-up hub are respectively connected to the supply reel table 23 by cassette loading.
And the take-up reel table 24. The rotation of the capstan motor 28 is transmitted to the supply reel table 23 and the take-up reel table 24 via the gear box 25, and the supply reel table 23 and the take-up reel table 24 are rotatable according to the operation mode.

When the cassette loading is completed, the tape take-out surface of the tape cassette is moved to the cylinder 22 by the cassette loading mechanism described later.
Is arranged at a position facing the peripheral surface of the. Then, the tape cassette is engaged with a positioning portion 131 to be described later, and the horizontal position and the height thereof are defined.

On the other hand, when the cassette loading is completed, a pair of tape pull-out members 3 and 4 which guide the movement of the tape pull-out member to a portion which passes from near the position of the cassette holder 90 to near the front end of the cylinder 22 and to near the rear end of the cylinder 22. Are formed in the chassis 11.
The sliders 3 and 4 are guided by these guide grooves 1 and 2,
It is slidable between a base end position of the guide grooves 1 and 2 near the front end of the cassette holder 90 and a terminal end position of the guide grooves 1 and 2 near the rear end of the cylinder 22.

The sliders 3 and 4 are constructed by attaching rotatable guide rollers 26 and 27 to shafts each having a flange. When the tape cassette is inserted into the housing and cassette loading is completed, the slider 3,
4 is located near the front end of the cassette holder 90. At this time, the guard panel on the front of the tape cassette opens, and the back of the tape in the cassette half (surface opposite to the magnetic recording surface)
The peripheral surfaces of the guide rollers 26 and 27 of the sliders 3 and 4 are located at the positions.

When the cassette loading is completed, the supply hub is freely rotatable so that the tape can be pulled out from the tape cassette. That is, when the sliders 3 and 4 move toward the rear end of the cylinder 22 along the guide grooves 1 and 2 while the tape is in contact with the peripheral surfaces of the rear ends of the guide rollers 26 and 27, the tape is taped. It is drawn out of the cassette and travels while being guided by guide rollers 26 and 27. When the tape is running, the guide rollers 26 and 27 are provided with flanges at both ends thereof.
The tape is prevented from coming off the guide roller.

More specifically, on the tape traveling path, there are disposed a cylinder 22, various poles for defining the traveling path, various heads for performing magnetic recording and reproduction, and the like. A guide roller 27, a supply tape guide pole 31, a tension pole 32, a take-up tape guide pole 33, a guide roller 26, a capstan roller 34, and a guide pole 35 are disposed near the guard panel when the cassette loading is completed. When the cassette loading is completed, the rear surface of the tape bridged between the supply hub and the winding hub in the tape cassette faces the rear end of these peripheral surfaces. The guide roller 27 and the guide pole 31 move simultaneously with the slider 4, and the guide roller 26 and the guide pole 33 move simultaneously with the slider 3.

An erasing head 40 and a guide pole 36 are disposed beside the guide groove 2, and an ACE head 41 and a guide pole for forming an audio track and a control track are provided beside the guide groove 1. 37 are provided. Further, a pinch roller 38 is also provided facing the capstan roller 34.

After the cassette loading is completed, the sliders 3 and 4 move toward the rear end of the cylinder 22 along the guide grooves 1 and 2 so that the tape is pulled out from the supply hub, and the guide pole 36, the full-width erasing head 40, It is wound around the peripheral surface of the cylinder 22 via the guide roller 27 and the supply-side tape guide pole 31, and further, the take-up side tape guide pole 33, the guide roller 26, the head 41, the guide pole 37, the capstan roller 34 and the pinch roller. 38 and are wound on a winding hub via a guide pole 35.

The tension pole 32 moves to the vicinity of the guide pole 36 during the movement of the slider 4 and comes into contact with the back surface of the tape, so that the tape tension can be adjusted. When the tape loading is completed, the pinch roller 38 moves to the capstan roller 34 side so that the tape can be pressed against the peripheral surface of the capstan roller 34 on the peripheral surface.

The pinch roller 38 is rotatable, and the capstan roller 34 rotates in response to the rotation of the capstan motor 28, thereby rotating with the tape interposed. Thereby, the tape can be transported. As shown in FIG. 3, the rotation of the capstan motor 28 is
6 is also transmitted. The pulley clutch 46 transmits the rotational force of the capstan motor 28 to the supply reel table 23 and the take-up reel table 24 via the gear box 25. As a result, the tape can be run according to various modes.

The tape loading is performed by utilizing the rotational force generated by a loading motor 51 provided on the side surface 14 of the chassis 11. The rotational force of the loading motor 51 is transmitted to the worm 80.
A rotatable worm wheel 5 is provided on the side of the chassis 11.
2 is provided, and a front loading cam gear (hereinafter, referred to as
The rotational force is transmitted to the FL cam gear 81). A joint gear 53 meshing with the FL cam gear 81 is rotatably provided on the rear surface of the chassis 11. A cam switch drive gear 54 meshing with the joint gear 53 is rotatably provided on the rear surface of the chassis 11. The torque of the loading motor 51 is transmitted from the worm 80 to the cam switch drive gear 54 via the worm wheel 52 and the joint gear 53.

Hook 5 provided on the back of chassis 11
A slider cam 57 is slidably attached to each of the sliders 5 and 56. The slider cam 57 is a plate-like member having a shape corresponding to the mode, and meshes with the cam switch drive gear 54 by teeth formed linearly on one end side. The slider cam 57 moves to a horizontal position according to the rotation of the cam switch drive gear 54.

A loading drive gear 58 is provided between the base ends of the guide grooves 1 and 2 so as to be rotatable around a shaft 59 implanted in the chassis 11. The loading drive gear 58 meshes with teeth formed linearly on the other end of the slider cam 57, and rotates in accordance with the linear movement of the slider cam 57. First and second arms 60, 61 are provided between the guide grooves 1, 2 on the opposite side of the loading drive gear 58 from the meshing portion with the slider cam 57.

The first and second arms 60 and 61 are rotatably provided by shafts 66 and 67 implanted in the chassis 11. The first arm 60 has a gear portion 63 having teeth formed on a part of a disk, and an arm portion 62 integrally formed with the gear portion 63. The second arm 61 has a gear portion 65 in which teeth are formed in a part of a disk, and an arm portion 64 formed integrally with the gear portion 65. Gear 63,
Numerals 65 mesh with each other and rotate in mutually opposite directions.

A notch gear 68 integrally formed on the surface of the gear portion 63 is provided coaxially with the gear portion 63. The notch gear 68 meshes with a tooth 69 formed on a part of the outer periphery of the loading drive gear 58. The rotation of the loading drive gear 58 causes the gear 63 to rotate, and the gear 65 also rotates.

At the ends of the arms 62 and 64, connecting members 7 are respectively provided.
One end of each of the shafts 2 and 73 is pivotally mounted on the shaft. Connecting member 7
The other ends of the sliders 2 and 73 are pivotally mounted on engaging portions 7 and 8 provided at the rear ends of the sliders 3 and 4, respectively. At the rotation end position of the loading drive gear 58 at the start of tape loading, the arm portions 62 and 64 of the first and second arms 60 and 61 have the distal ends located near the base ends of the guide grooves 1 and 2 and the sliders. The reference numerals 3 and 4 are adapted to stop at the base ends of the guide grooves 1 and 2.

The slider 4 is integrally formed with a stop member 75 projecting toward the surface of the chassis 11. When the sliders 3 and 4 are located at the base ends of the guide grooves 1 and 2, the stop member 75 is stopped. 75 contacts the tension arm 76.
Unloading stopper 7 on the surface of chassis 11
9 is provided to project from the tension arm 76.
The unloading stopper 79 prevents movement of the slider 4 in the unloading direction. That is, the position of the guide roller and the tape guide at the time of unloading is defined by stopping the slider 4 in a state where the stop member 75 is in contact with the tension arm 76 and the unloading stopper 79.

The loading motor 51 drives not only the tape loading mechanism but also the cassette loading mechanism. That is, the side surface 14 of the chassis 11
FL cam gear 81 meshed with the worm wheel 52
Are provided rotatably. Loading motor 51
Is transmitted to the FL cam gear 81 via the worm 80 and the worm wheel 52.

Hook 8 provided on side surface 14 of chassis 11
A front loading drive slider (hereinafter, referred to as an FL drive slider) 82 is slidably attached to a locking portion 84 at the tip of the rotating shaft of the 3 and FL cam gear 81.

The FL drive slider 82 is a plate-like member having a shape corresponding to the mode, and a guide pole 85 is planted toward the surface of the FL cam gear 81. A guide groove 86 is formed on the surface of the FL cam gear 81, and a guide pole 85 implanted in the FL cam gear 81 is engaged with the guide groove 86 and slid, whereby the FL cam gear 81 rotates. Thus, the FL drive slider 82 can be slid. FL drive slider 8
A cutout portion 87 that engages with the engaging portion 92 of the arm assembly 120 is formed at the end of the second arm.

The arm assembly 120 is swingable about a shaft 141 provided on the side surface 14 of the chassis 11,
The drive slider 82 slides to engage the engaging portion 92 with the chassis 11.
Is moved in the front-rear direction, thereby swinging about the shaft 141. Engagement groove 1 of arm assembly 120
27, the guide post 107 of the cassette holder 90 is inserted.
The cassette holder 90 is driven in the horizontal and vertical directions.

The cassette holder 90 has left and right brackets 96 and 97 connected by a bottom plate 95. The left bracket 96 has a pair of front and rear guide posts 1.
05 and 106 are planted, and a guide post 107 is planted in the right bracket 97.

A pair of guide grooves 112 and 111 into which guide posts 105 and 106 are slidably inserted are formed on the side surface 13 of the chassis 11 for transferring the cassette holder 90 in the horizontal and vertical directions. . One guide groove 113 into which the guide post 107 is slidably inserted is formed on the side surface 14 of the chassis 11.

The guide grooves 111 to 113 are provided in the chassis 1
1 is a groove formed through both side surfaces 13 and 14,
It extends in the horizontal direction on the upper side of the side surfaces 13 and 14, and extends vertically downward on the rear end side of the chassis 11. Guide post 10
5 and 106 are inserted into guide grooves 112 and 111, respectively, and guide post 107 is inserted into guide groove 113.
The guide posts 106, 105, and 107 are provided with guide grooves 111.
, The cassette holder 90 is moved horizontally from the cassette insertion port side, and further, the cassette holder 90 is moved vertically downward at the rear end side of the chassis 11 so that the bottom plate 95 of the cassette holder 90 is moved to the chassis. 11 can be positioned near the bottom surface 12.

An arm assembly 120 is employed to transfer the cassette holder 90 horizontally and then vertically downward to press the cassette holder 90 against the chassis 11. The arm assembly 120 includes
It is constituted by a plate 121, a left bracket 122 and a right bracket 123. The plate 121 has a flat plate shape, and both ends have fitting portions 1 of the brackets 122 and 123.
24, 125, the left and right brackets 122,
123 are connected.

The cassette holder 9 is attached to the left bracket 122.
An engagement groove 126 into which the guide post 105 of the left left bracket 96 is inserted is provided. The engagement groove 126 has an elongated shape corresponding to the horizontal and vertical movement of the guide post 105. That is, the guide post 105 of the cassette holder 90 is engaged with the engagement groove 1 of the arm assembly 120.
26 and guide groove 11 provided on side surface 13 of chassis 11
2 at the same time.

On the other hand, the right bracket 123 is provided with an engaging groove 127 into which the guide post 107 of the right bracket 97 of the cassette holder 90 is inserted. Engagement groove 12
Reference numeral 7 denotes an elongated shape corresponding to the movement of the guide post 107 in the horizontal and vertical directions, and an insertion port for inserting the guide post 107 is provided at the upper part. That is, the guide posts 107 of the cassette holder 90 are simultaneously inserted into the engagement grooves 127 of the arm assembly 120 and the guide grooves 113 provided on the side surface 14 of the chassis 11. As described above, the arm assembly 120 moves the shaft 1 fixed to the side surface 14 of the chassis 11 by moving the engagement portion 92 in the front-rear direction of the chassis 11 by the FL drive slider 82.
It swings around 41.

When the longitudinal direction of the bracket 123 is substantially parallel to the bottom surface 12 of the chassis 11, the guide post 107 in the engagement groove 127 is moved by a predetermined urging member.
To the bottom surface 12 side of the chassis 11. Thus, the tape cassette is pressed against the bottom surface 12 of the chassis 11 at the end of the cassette loading.

FIG. 4 shows the vicinity of the positioning portion 131 at the end of the cassette loading as viewed from the direction C in FIG.

As shown in FIG. 1, the positioning section 131
The bottom surface 12 of the chassis 11 is formed by bending at right angles to the cassette insertion direction. The positioning portion 131 has a top portion 134 having a predetermined width relatively narrow in the direction of the cassette insertion opening at the upper end, and an inclined portion inclined at predetermined taper angles a and b from the top portion 134 toward the wide base end side. 132 and 133 are provided. The inclined portion 132 faces the cassette insertion port side, and the inclined portion 133 faces the cylinder 22 side.

The width of the crown 134 in the direction of the cassette insertion opening is equal to the width of the opening 13 of the engagement hole 137 formed in the cassette 135.
6 is set smaller than the width of the cassette 135 in the direction of the cassette slot, and the width of the inclined portions 132 and 133 at the position where the height from the bottom surface 12 of the chassis 11 is a predetermined height is smaller than the width of the cassette 135 in the direction of the cassette slot. The width of the mating hole 137 is set to be substantially the same as the width in the cassette insertion direction. Also, the inclined portion 132
Is set smaller than the inclination angle b of the inclined portion 133. The engaging hole 137 of the cassette 135 is the inclined portion 1
The position of the positioning section 131 is set so as to define the horizontal position of the cassette 135 while being supported by the cassettes 32 and 133.

Next, the operation of the embodiment configured as described above will be described.

FIG. 2 shows a state before the cassette holder 90 is mounted. The cassette holder 90 includes a left bracket 96.
Guide post 105 is engaged with engagement groove 126 of left bracket 122 of arm assembly 120 and side surface 13 of chassis 11.
Into the guide groove 112 and guide post 106
The guide post 107 of the right bracket 97 is provided in the engagement groove 127 of the right bracket 123 of the arm assembly 120 at the insertion opening 119 provided in the side surface 14 of the chassis 11 in a state in which is inserted into the guide groove 111 of the side surface 13. The guide groove 1 in the engagement groove 127 and the side surface 14 of the chassis 11 from the opening
13, the side surfaces 13, 1
Attached between four.

FIG. 3B shows a state in which the guide post 107 is guided into the engagement groove 127 and the guide groove 113. FIG. 1 shows that the cassette holder 90 is the side 1 of the chassis 11.
The state attached between 3 and 14 is shown. In the state of FIG. 1, a tape cassette (not shown) is inserted into the cassette holder 9.
0, and pushed into the rear end of the chassis 11, the cassette detection lever 11
7 is pushed, and the cassette holder 90 is
5 to 107 are guided by the guide grooves 112, 111, 113 on the side surfaces 13, 14 of the chassis 11 and slide to be transferred to the horizontal rear end side of the chassis 11.

When the cassette holder 90 is transferred to a predetermined position in the horizontal direction, the loading motor 51 is moved.
Starts to rotate. The rotation of the loading motor 51
The power is transmitted to the FL drive slider 82 via the worm 80, the worm wheel 52, and the FL cam gear 81, and slides the FL drive slider 82 toward the rear end of the chassis 11.

As a result, the engaging portion 92 of the arm assembly 120 moves to the rear end side of the chassis 11, and the right bracket 1
Reference numeral 23 swings around the shaft 141 so that the upper end moves toward the rear end of the chassis 11. The arm assembly 120 moves the guide posts 105 and 107 along the guide grooves 112 and 113 by the engagement grooves 126 and 127 by swinging the left and right brackets 122 and 123, and transfers the cassette holder 90 horizontally rearward and further vertically. Transfer downward.

As a result, during the downward transfer of the tape cassette 135, the opening 136 of the engaging hole 137 is
Face 34. When the cassette holder 90 is further lowered in this state, the tape cassette 135 moves downward while the inner surface of the engagement hole 137 of the tape cassette 135 abuts on the inclined portion 132 or the inclined portion 133.

Finally, the engagement holes 137 of the tape cassette 135 are supported near the lower ends of the inclined portions 132 and 133, and the tape cassette 135 is positioned in the horizontal and vertical directions.

During the transfer of the cassette holder 90, the tape cassette 135 may slightly move toward the cassette insertion port in the cassette holder 90. However, the taper angles of the inclined portions 132 and 133 are
Since the taper angle “b” in the cylinder direction is set to be larger than the taper angle “a” in the cassette insertion port direction side, the top 134 of the positioning portion 131 is formed in the opening 136 of the engagement hole 137 of the cassette 135. Is definitely located within the range. Thus, even when the tape cassette 135 is displaced in the cassette holder 90, it is possible to reliably position the tape cassette 135.

In this case, the arm assembly 120
Is located closest to the rear end of the chassis 11, and the left and right brackets 122 and 123 are in a state where the longitudinal direction is substantially parallel to the bottom surface 12 of the chassis 11. In this state,
The guide post 107 in the engagement groove 127 is pressed against the bottom surface 12 of the chassis 11 by a predetermined biasing member, and the cassette holder 90 is pressed against the bottom surface 12 of the chassis 11 to supply the cassette with the cassette supply hub and take-up. Hub is reel base 2
It is crimped to 3,24.

When the pressure-bonding of the cassette is completed, tape loading for winding the tape around the cylinder 22 is performed by the tape loading device.

As described above, in this embodiment, since the positioning portion is formed by bending the bottom surface of the chassis, it is possible to reduce the number of parts and the number of steps. it can.

[0055]

As described above, according to the present invention, the number of parts is reduced and the number of working steps is reduced by bending the bottom surface of the chassis to serve as a member for determining the position and height of the tape cassette. It has the effect that it can be done.

[Brief description of the drawings]

FIG. 1 is a plan view of a magnetic recording and reproducing device in which a cassette positioning device according to an embodiment of the present invention is incorporated, as viewed from above.

FIG. 2 is an explanatory view showing the cassette holder removed from FIG. 1;

FIG. 3 is an explanatory diagram showing FIG. 1 viewed from another direction.

FIG. 4 is a side view showing the vicinity of a positioning portion in FIG. 1 in detail.

[Explanation of symbols]

11 chassis, 12 bottom, 13, 14 side, 90
... cassette holder, 120 ... arm assembly, 131 ... positioning part.

Claims (3)

[Claims] A positioning section formed by bending a bottom surface of a chassis on which the reel base is mounted, in order to position the cassette conveyed by a cassette conveyance mechanism for mounting the cassette on the reel base. Characteristic cassette positioning device. 2. The cassette positioning apparatus according to claim 1, wherein the positioning section has a support section for supporting the cassette, and performs positioning of the cassette not only in a horizontal direction but also in a height direction. . 3. The positioning portion is formed by bending a bottom surface of the chassis in a direction substantially perpendicular to an insertion direction of the cassette, and a pair of inclined portions having a width narrower toward an upper end thereof is formed in the front and rear directions in the cassette insertion direction. 2. The cassette positioning device according to claim 1, wherein the taper angle on the insertion port side of the cassette is set smaller than the taper angle on the opposite side.