JPH11213488A - Tape loading mechanism of magnetic recording and reproducing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a tape loading mechanism of a magnetic recording/ reproducing device capable of contriving the reduction of cost by reducing the number of components and also capable of easily and surely performing the control of the press-fixing of pole bases to an unloading position. SOLUTION: In this tape loading mechanism, poles 12 are mounted for pulling out a magnetic tape to wind it onto a rotary drum, and the mechanism is furnished with pole bases 11, 11' moving back and forth between an unloading position and a loading finish position along guide grooves 5, 5' of a chassis 4, loading arms 16, 16' for moving these pole bases back and forth along the guide grooves, loading gears 17, 17' for turning these loading arms, and twist coil springs 20, 20' for controlling the press-fixing of the pole bases to prescribed positions, then the loading gears are integrally formed on the base end parts of the loading arms and the both end sides of the twist coil springs are respectively supported to the tip end sides of the loading arms and the pole bases.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape loading mechanism of a magnetic recording / reproducing apparatus such as a video tape recorder (VTR) for drawing a magnetic tape from a tape cassette and winding it around a rotating drum.

[0002]

2. Description of the Related Art FIG. 6 shows a tape loading mechanism for a VTR of this type.

[0003] The tape loading mechanism 1 of this VTR
Reference numeral 0 'denotes a pair of left and right guide grooves 5 and 5' formed in the chassis 4 by attaching the inclined pole 12 and the guide roller 13 for pulling out the magnetic tape 2 from the tape cassette 1 and winding it around the rotary drum 3. A pair of pole bases 11 on the supply side and the take-up side which reciprocate between the unloading position and the loading completion position along
11 'and rotatably supported by the chassis 4 on the support shafts 14 and 14', and the pole bases 11 and 11 'are connected to the guide grooves 5 and 5 via the intermediate links 15 and 15'. ′, And a pair of loading arms 16 and 16 ′ that reciprocate along
Loading gears 17, 1 for rotating 6, 6 '
7 ', one end of which is locked to each of the loading arms 16 and 16', and the other end of which is locked to each of the loading gears 17 and 17 'so that the pole bases 11 and 11' are crimped to the loading completed position. Each coil spring 18,1
8 '.

The loading gear 17 on the supply side meshes with the loading gear 17 'on the take-up side, and a pinion 17a is integrally formed on the loading gear 17 on the supply side. This pinion 17a
Are engaged with a rack 19a of a control plate 19 which reciprocates along the lower surface of the chassis 4 by a drive motor (not shown) or the like.

The forward movement of the control plate 19 (movement in the direction of arrow A in FIG. 6) causes the loading gear 17 on the supply side to move clockwise and the loading gear 17 'on the take-up side to move counterclockwise. The rotation causes the loading arms 16, 16 'coaxial with the loading gears 17, 17' to rotate in the same direction, respectively.
16 ', each intermediate link 15, 15' and each pole base 1
The pole bases 11 and 11 ′ move along the guide grooves 5 and 5 ′ of the chassis 4 and pull out the magnetic tape 2 of the tape cassette 1 toward the rotating drum 3 by the link mechanism composed of the link mechanisms 1 and 11 ′.

Each of the pole bases 11 and 11 'is connected to the chassis 4
When each of the guide grooves 5, 5 'comes to the loading completion position at the upper end in the drawing, the limiter is operated by the coil springs 18, 18' interposed between the loading arms 16, 16 'and the loading gears 17, 17'. The mechanism operates so that the pole bases 11, 11 'are crimped to the loading completed position. Further, the pressing force at this time is also obtained by friction between the toothless portion 17b of the pinion 17a of the loading gear 17 on the supply side and the rack 19a of the control plate 19.

A similar technique relating to the tape loading mechanism 1 'of this VTR is disclosed in Japanese Patent Application Laid-Open No. 5-182317.

[0008]

However, in the conventional VTR tape loading mechanism 10 ', the components are on one side, the pole base 11 (11'), the intermediate link 15 (15 '), and the loading arm 16 (16'). ), Loading gear 17 (17 ') and coil spring 18
(18 '), which was as high as 5 points, which was costly. In addition, a lock mechanism is required to regulate each of the pole bases 11 and 11 'to the unloading position at the lower end of each of the guide grooves 5 and 5' of the chassis 4. This also increases the number of components and the cost. . In addition, each pole base 1
In order to obtain a crimping force for restricting the pressure of 1, 1 'to the loading completion position, the loading gear 1 on the supply side is required.
Since the pinion 17a of No. 7 is provided with the toothless portion 17b, the wear of the toothless portion 17b was large.

Accordingly, the present invention has been made to solve the above-mentioned problems, and it is possible to reduce the number of parts to reduce the cost, and to simplify the crimping control of the pole base to the unloading position. An object of the present invention is to provide a tape loading mechanism of a magnetic recording / reproducing apparatus that can reliably perform the operation.

[0010]

According to the first aspect of the present invention, at least a pole for pulling out a magnetic tape and winding it around a rotary drum is attached, and an unloading position and a loading completion position are arranged along a guide groove formed in a chassis. And a loading arm linked to the pole base for reciprocating the pole base along the guide groove, a loading gear for rotating the loading arm, and the pole base. In a tape loading mechanism of a magnetic recording / reproducing apparatus having a torsion coil spring for restricting pressure bonding to a predetermined position, the loading gear is integrally formed at a base end of the loading arm, and the loading gear is formed at a distal end side of the loading arm and the pole base. Supporting both ends of the torsion coil spring, Characterized in that were freely respectively crimped restricted to the unloading position and the loading completion position Rubesu.

According to a second aspect of the present invention, in the tape loading mechanism of the magnetic recording and reproducing apparatus according to the first aspect, a control plate is provided on the chassis so as to be reciprocally movable,
A pinion of the loading gear meshes with a rack provided on the control plate, and a cam follower provided on the loading arm is slidable on a cam provided on the control plate.

According to a third aspect of the present invention, in the tape loading mechanism of the magnetic recording / reproducing apparatus according to the first aspect, a wide portion is provided on the guide groove on the loading completion position side of the pole base, and from the wide portion, the guide groove is formed. And a reverse T-shaped retaining portion protruding from the lower surface of the pole base is freely inserted into the inside of the pole base, and the retaining portion is inserted into the wide portion on the side of the chassis where the pole base is completely loaded. A guide is sometimes provided to guide and restrict the position of the pole base to a predetermined position.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 are plan views showing a tape loading mechanism of a VTR as a magnetic recording / reproducing apparatus according to an embodiment of the present invention.

The tape loading mechanism 10 of this VTR
Is mounted with an inclined pole 12 and a guide roller 13 for pulling out the magnetic tape 2 from the tape cassette 1 and winding it around the rotary drum 3, and a pair of left and right guide grooves 5, 5 formed in a metal chassis 4. ′, A pair of pole bases 1 on the supply side and the take-up side which reciprocate between the unloading position and the loading completion position.
1, 11 'and the pole bases 11, 20' via respective torsion coil springs 20, 20 ', which are rotatably supported on the chassis 4 by the support shafts 14, 14' and function as torsion springs. 11 'is provided with a pair of loading arms 16, 16' made of synthetic resin for reciprocating the guide 11 'along the guide grooves 5, 5'.

1 to 3 and FIGS. 5 (a), 5 (b),
As shown in (c), each of the pole bases 11 and 11 'is made of metal and is formed in a block shape having a predetermined shape. The moving guide pins 11a and 11b are integrally formed to protrude. In the center of the lower surface of each of the pole bases 11 and 11 ', an inverted T-shaped retaining portion 11c is integrally formed to protrude.
The retaining portion 11c of each of the pole bases 11 and 11 'is formed by a wide portion 5b formed on one end 5a side (at the upper end in the drawing, on the loading completion position side of each pole base) serving as a stopper of each of the guide grooves 5 and 5'. It is designed to be inserted and assembled. That is, the wide portion 5b of each guide groove 5, 5 '
Width B of each pole base 11, 11 '
1c and the width D of the other portions of the guide grooves 5, 5 'are wider than the width D of the guide grooves 5, 5'. Is wider than the width D of the other portion.

Further, the wide portions 5b of the guide grooves 5, 5 '
Of the pole bases 11, 11 'to the wide portion 5b on the chassis 4 near the rotary drum 3.
A columnar guide 6 is provided to guide the respective pole bases 11 and 11 'so as not to hit the rotary drum 3 when the 1c is inserted. That is, the wide portion 5b of each guide groove 5, 5 '
When the retaining portions 11c of the respective pole bases 11 and 11 'are inserted into the guide base 6, the lower portions of the opposing side surfaces 11d of the respective pole bases 11 and 11' contact the peripheral wall of each guide 6 and the posture thereof is shown in FIG. In such a way, it is regulated so that it does not become unstable.

As shown in FIGS. 1 to 3, a loading gear 1 is provided at the base end of each of the loading arms 16, 16 '.
7, 17 'are integrally formed. The loading gear 17 integrally formed on the base end of the loading arm 16 'on the supply side and the loading gear 17' integrally formed on the base end of the loading arm 16 'on the take-up side are engaged with each other. A pinion 17a is further formed integrally with the loading gear 17 on the side (lower side of the base end of the loading arm 16 on the supply side). The pinion 17a meshes with a rack 19a of a control plate 19, which is made of synthetic resin and reciprocates along the lower surface of the chassis 4 by a drive motor (not shown) or the like. Further, a cam 19 provided above the rack 19a of the control plate 19 is provided on the lower surface of the middle part of the loading arm 16 on the supply side.
A cylindrical boss (cam follower) 16b that slides on b is integrally formed.

FIGS. 1 to 3 and FIGS. 4 (a), (b),
As shown in (c), the pair of torsion coil springs 20 and 20 'on the supply side and the take-up side have the same shape, and have C-shaped both ends 20a and 20a and the winding part 2 at the center.
0b. As shown in FIG. 2, one end 20a of each of the torsion coil springs 20, 20 'is pivotally supported by a tip of each of the loading arms 16, 16' so as not to come off, and the other end of each of the torsion coil springs 20, 20 '. A pin 20a is pivotally supported by a guide pin 11b of each of the pole bases 11 and 11 'so as to be able to be prevented from coming off. The winding part 20b at the center of each torsion coil spring 20, 20 'is shown in FIG.
As the unloading state shown in FIG. 4A, the loading halfway shown in FIG. 4B (initial state), and the loading completed state shown in FIG. It is designed to be elastically deformed into a state of a shape. Thus, the pole bases 11 and 11 'are unloaded at the unloading position (on the lower end 5c side serving as a stopper for each of the guide grooves 5 and 5') and the loading completed position (the stoppers for the respective guide grooves 5 and 5 'in the figure). The crimping is restricted to the upper end 5a).

The tape loading mechanism 1 of the above embodiment
0, as shown in FIG. 1, each pole base 11,
At the unloading position 11 ', the torsion coil springs 20, 20' act in the direction of extension, and the positions of the pole bases 11, 11 'are moved to the respective torsion coil springs 20, 2'.
With the urging force of 0 ', the pressure can be easily and reliably regulated to the unloading position (the lower end 5c of each guide groove 5, 5'). In other words, each pole base 11,
When the lower end of 11 'comes into contact with the lower end 5c of each guide groove 5, 5', a crimping force is generated by each torsion coil spring 20, 20 '.

When the control plate 19 moves forward (moves in the direction of the arrow A in FIG. 1), the loading arm 16 on the supply side is rotated by a clock via a loading gear 17 integrally formed at the base end of the loading arm 16. The loading arm 16 'on the take-up side rotates counterclockwise via a loading gear 17' integrally formed at the base end of the loading arm 16 ', and the loading arms 16 and 16'. And each torsion coil spring 20, 20 'and each pole base 11, 1
1 ′, each pole base 11,
11 'moves along the guide grooves 5, 5' of the chassis 4 to pull out the magnetic tape 2 of the tape cassette 1 toward the rotating drum 3.

Each of the pole bases 11 and 11 ′ is mounted on the chassis 4.
When the upper end 5a of each of the guide grooves 5, 5 'comes to the loading completed position, the elasticity of each torsion coil spring 20, 20' interposed between each of the loading arms 16, 16 'and each of the pole bases 11, 11'. The limiter mechanism is actuated by the urging force, and the above-mentioned pole bases 11 and 11 'are crimped to the loading completed position. At the loading completion position, when the upper ends of the pole bases 11 and 11 'come into contact with stoppers (not shown) provided near the upper ends of the guide grooves 5 and 5', the crimping force of the torsion coil springs 20 and 20 'is applied. Has occurred. The pressure force at this time is also obtained by friction between the toothless portion 17b of the pinion 17a of the loading gear 17 on the supply side and the rack 19a of the control plate 19.
During the loading of 1 ', the boss 16b of the loading arm 16 on the supply side is
A pressure force is obtained by sliding on the cam 19b. As a result, the pinion 17a of the pinion 17a of the loading gear 17 on the supply side, which has conventionally occurred when the respective pole bases 11 and 11 'are crimped to the loading completed position.
7b is reduced.

In the tape loading mechanism 10, loading gears 17, 17 'are integrally formed at the base ends of the loading arms 16, 16', and the conventional intermediate links 15, 15 'and coil springs 18, 18'. Is also used by one torsion coil spring 20, 20 ', so that the total number of components can be reduced from five to three on one side, and the cost can be reduced accordingly. . Further, the torsion coil springs 20 and 20 'can also serve as a locking mechanism for restricting the pressure of the respective pole bases 11 and 11' to the unloading position of the lower end 5c of each of the guide grooves 5 and 5 'of the chassis 4. From this point of view, the number of components can be reduced, and the cost can be further reduced.

Further, each guide groove 5 on the chassis 4
Since the guides 6 are provided at predetermined positions near the rotary drum 3 of the wide portion 5b of the 5 ', the retaining portions of the pole bases 11, 11' to the wide portions 5b of the guide grooves 5, 5 '. 1
At the time of insertion of 1c, the lower portion of the opposing side surface 11d of each pole base 11, 11 'hits the peripheral wall of each guide 6 and its posture does not become unstable as shown in FIG. 5b, when the retaining portions 11c of the respective pole bases 11, 11 'are inserted into the respective pole bases 11, 1'.
1 'does not contact the rotating drum 3.

According to the above-described embodiment, the pole base is slidably slid along the elongated guide groove. However, the pole base is slid along the elongated (concave) guide groove. It may be free.

[0026]

As described above, according to the tape loading mechanism of the first aspect of the present invention, the loading gear is integrally formed at the base end of the loading arm, and the loading gear is twisted to the distal end side and the pole base. Since both ends of the coil spring are supported and the pole base is freely press-regulated at the unloading position and the loading completion position, the number of components can be reduced and cost can be greatly reduced.

According to the tape loading mechanism of the present invention, a control plate is provided on the chassis so as to be reciprocally movable, and a rack provided on the control plate is engaged with a pinion of the loading gear and provided on the control plate. By making the provided cam slidable on the cam follower provided on the loading arm, it is possible to reduce abrasion of the toothless portion of the pinion of the loading gear which applies a pressing force when the loading of the pole base is completed.

According to the tape loading mechanism of the third aspect of the present invention, a wide portion is provided on the guide groove on the side of the pole base where the loading is completed, and the inverted T projecting from the wide portion into the guide groove on the lower surface of the pole base. A guide for restricting the position of the pole base to a predetermined position when the stopper is inserted into the wide portion is provided on the side of the chassis pole base where the loading is completed, while allowing the character-shaped stopper to be freely inserted. Thereby, when the retaining portion of the pole base is inserted into the wide portion of the guide groove, the posture of the pole base can be stabilized and the contact between the pole base and the rotating drum can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a plan view showing an unloaded state of a tape loading mechanism of a magnetic recording and reproducing apparatus according to an embodiment of the present invention.

FIG. 2 is a plan view showing a state during the loading of the tape loading mechanism.

FIG. 3 is a plan view showing a completed loading state of the tape loading mechanism.

FIG. 4A is an explanatory view showing a state of a torsion coil spring when the tape loading mechanism is unloaded.
(B) is an explanatory view showing the state of the torsion coil spring at the beginning of loading of the mechanism, and (c) is an explanatory view showing the state of the torsion coil spring at the time of completing loading of the mechanism.

FIG. 5A is an explanatory view of assembling the pole base of the tape loading mechanism into a guide groove, FIG. 5B is an explanatory view of a case where the pole base is unstable in posture, and FIG. FIG. 4 is an explanatory diagram in a case where a position is regulated by a guide.

FIG. 6 is a plan view showing an unloading state of a tape loading mechanism of a conventional magnetic recording / reproducing apparatus.

[Explanation of symbols]

 Reference Signs List 2 magnetic tape 3 rotating drum 4 chassis 5, 5 'guide groove 5b wide portion 6 guide 10 tape loading mechanism 11, 11' pole base 11c retaining portion 12 inclined pole (pole) 16, 16 'loading arm 16b boss (cam follower) 17, 17 'Loading gear 19 Control plate 19a Rack 19b Cam 20, 20' Torsion coil spring 20a, 20a Both ends

Claims (3)

[Claims] At least a pole for pulling out a magnetic tape and winding it around a rotating drum is attached, and a pole base that reciprocates between an unloading position and a loading completion position along a guide groove formed in a chassis; A loading arm linked to the pole base for reciprocating the pole base along the guide groove, a loading gear for rotating the loading arm,
In a tape loading mechanism of a magnetic recording / reproducing apparatus having a torsion coil spring for restricting the pole base from being pressed at a predetermined position, the loading gear is integrally formed at a base end of the loading arm, and a distal end side of the loading arm and the A tape loading mechanism for a magnetic recording / reproducing apparatus, wherein both ends of the torsion coil spring are supported by a pole base and the pole base is freely press-fitted to the unloading position and the loading completion position. 2. The tape loading mechanism for a magnetic recording / reproducing apparatus according to claim 1, wherein a control plate is provided on the chassis so as to be reciprocally movable, and a pinion of the loading gear is meshed with a rack provided on the control plate. ,
A tape loading mechanism for a magnetic recording / reproducing apparatus, wherein a cam follower provided on the loading arm is slidable on a cam provided on the control plate. 3. The tape loading mechanism for a magnetic recording / reproducing apparatus according to claim 1, wherein a wide portion is provided on the guide groove on a side of the pole base where loading of the pole base is completed, and the pole base is inserted from the wide portion into the guide groove. While the inverted T-shaped retaining portion protruding from the lower surface of the pole base is made freely insertable, the pole base is inserted into the wide portion at the loading completion position side of the pole base of the chassis. A tape loading mechanism for a magnetic recording / reproducing apparatus, wherein a guide for regulating a position to a predetermined position is provided.