JP3133573B2 - Reel base drive - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reel drive unit in a magnetic recording / reproducing apparatus such as a video tape recorder (VTR).

[0002]

2. Description of the Related Art In a magnetic recording / reproducing apparatus such as a VTR and a DAT, a method of driving a reel base by a capstan motor is generally used for a small and lightweight mechanism. that time,
In the REC or PLAY mode and the FFWD or REW mode, the tape speed is greatly different, so that the rotation speed of the reel base changes greatly. However, greatly changing the rotation speed of the capstan motor is characteristically disadvantageous. Therefore, the reduction ratio from the capstan motor to the reel base is generally set to a large value in the REC or PLAY mode.

FIG. 6 shows a conventional example using a timing belt. In the REC / PLAY mode, the timing belt 101, the idler gear 1
The rotation is transmitted to the reel base large gear 103 through the gear 02.
The idler gear 102 is rotated clockwise (CW) by a friction mechanism provided between the idler gear 102 and the idler lever 104.
Perform a swing motion. At this time, idler gear 1
The second stopper 105 is restricted by the first stopper 105 so as not to be caught in the reel base large gear 103. In the FFWD / REW mode, to reduce the reduction ratio as described above, for example, the relay gear 106
And the small gear 108 of the reel base is engaged in the rotation, and the rotation is transmitted. Since the idler gear 102 also performs a swing operation, the second stopper 109 is operated so that the idler gear 102 and the large reel base gear 103 do not mesh with each other.
It is necessary to regulate the swinging motion.

Next, the hard brake 110 will be described. When entering the STOP mode from the FFWD / REW mode, it is necessary to apply the hard brake 110 in order to rapidly stop the rotation of the reel base. As one of the hard brake opening / closing methods, there is a method that operates in conjunction with a pinch roller attaching / detaching operation. However, although it is effective when entering the STOP mode from the PLAY mode, the FFWD / REW mode which does not involve the pinch roller attaching / detaching operation causes the S mode.
It cannot be used when shifting to the TOP mode.

[0005]

It is necessary to provide a second stopper mechanism for restricting the swinging operation of the idler gear in the FFWD / REW mode. Furthermore, FFWD
Since it is necessary to provide a dedicated mechanism for opening and closing the hard brake in the / REW mode, there is a problem that the number of parts increases.

[0006]

According to the present invention, there is provided a reel stand driving apparatus comprising: a drive gear arranged on a straight bisector connecting the centers of a pair of reel stands; an idler gear meshed with the drive gear; A swing lever having a piece, a pair of relay gears arranged on the left and right sides of the drive gear, always meshing with each other and meshing with any of the reel bases according to an operation mode, and are arranged coaxially with the drive gear. And a pair of restricting tongues that engage the engaging tongues with the rotating levers. A plurality of notches corresponding to each operation mode and a hard brake release operating piece are provided, and the rotation lever is set to a predetermined mode by engaging the holding lever with the notch. By using Without providing the over key release mechanism,
Idler gear swing regulation in FFWD / REW mode,
And a hard brake opening / closing operation.

[0007]

With the above arrangement, in the REC / PLAY mode, the rotating lever on which the pair of relay gears are mounted is held at the neutral position, and one of the restricting pieces of the swing lever comes into contact with the stopper pin, thereby restricting the position. In this state, the idler gear meshes with the large gear on the reel base to drive the reel base. FFWD
In the / REW mode, the rotating lever rotates, and the operating piece of the rotating lever rotates the brake piece to both reel bases to release the brake, and the relay gear meshes with the small gear of the reel base. To drive the reel base. At this time, the engaging tongue of the swing lever is held in a state where the abutment position is regulated by the one regulating tongue of the rotating lever, so that the idler gear is separated from the gear of the reel base.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific embodiment of the present invention will be described below with reference to the drawings. 1 is an external perspective view of a main part of the present invention, FIG. 2 is a plan view of a STOP mode, and FIG. 3 is a REC / P.
FIG. 4 is a plan view of the FFWD mode, and FIG. 5 is a sectional view of a main part.

In FIG. 2, 1 is a capstan motor,
Reference numerals 2 and 3 are a supply-side reel base and a take-up reel base, respectively. As shown in FIG. 5, the reel bases 2 and 3 are integrally formed with reel wings 2d and 3d to be fitted with a hub (not shown) in the cassette tape and small gears 2b and 3b, and felts 2e and 3b. Large gears 2a, 3a are rotatably inserted through 3e. Reference numeral 4 denotes a cylinder, 5 denotes a chassis, and 6 denotes a drive gear integrally formed with a pulley gear 6a. The pulley gear 6a meshes with the capstan motor gear 1a. Reference numeral 7 denotes a timing belt, and reference numeral 8 denotes a driven pulley on which the timing belt 7 is wound. The pulley 8 is integrally formed with a small gear 8a and a large gear 8b. 9 is an idler gear meshed with the small gear 8a of the driven pulley 8, and 10 and 11 are outer peripheral portions 2c and 3 of the reel bases 2 and 3.
c is a hard brake that is rotatable on shafts 5d and 5e fixed on the chassis 5 that brakes the reel bases 2 and 3 by abutting on the shafts 5d and 5e.

An idler lever 12 has an idler gear 9 as shown in the sectional view of FIG.
And a felt 13 is interposed therebetween to form a friction mechanism. The idler lever 12 has an engaging tongue (first
Engaging means) 12a is bent, and edges (second regulating means) 12b and 12c for rotation control are formed. Reference numeral 14 denotes a stopper pin implanted on the chassis 5, and the pin 14 is provided on a bisector of a straight line connecting the center axes 5a and 5b of the reel bases 2 and 3. Reference numerals 15 and 16 denote relay gears. The relay gears 15 and 16 are disposed on the left and right sides of the large gear 8b of the driven pulley 8, always mesh with the large gear 8b, and rotate around the support shaft 5c of the pulley 8. It is rotatably provided on a rotating lever 17 which rotates.

The relay gears 15 and 16 selectively mesh with any of the small gears 2b and 3b of the second and third reels according to the operation mode, and rotate the corresponding reel base 2 or reel base 3. A plurality of notches 17a, 17b, 17c are formed at one end of the rotating lever 17, and a follower pin 17d is fixedly implanted at the other end. The rotating lever 17 further includes a pair of regulating tongue pieces (first regulating means) 17e and 17f,
First regulating surfaces 10a, 11a of hard brakes 10, 11
The first operating piece (first operating means) 17g facing the second brake piece and the second operating pieces (second operating means) 17h and 17i facing the second regulating surfaces 10b and 11b of the hard brakes 10 and 11 are integrally folded. It is curved (see FIG. 1).

Reference numeral 18 denotes a cam groove 1 with which a follower pin 17d engages.
The cam gear 18 is formed with a cam gear, and the cam gear 18 rotates by obtaining a rotational driving force from a driving source such as a motor (not shown) via a speed reduction mechanism (not shown). 19 is the cutout 17
a, 17b, and 17c, a flexible holding lever having a pawl 19a that engages modestly with the hard brakes 10, 1;
It is a spring spanned between one.

Next, the operation of the present invention will be described. FIG. 2 shows the STOP mode. In the STOP mode, the notch 17b of the holding lever 19 is
In a state where 9a is engaged, the relay gears 15, 16 and the idler gear 9 are all separated from the reel bases 2, 3.
The hard brakes 10, 11 are in contact with the outer peripheral portions 2c, 3c of the two reel stands 2, 3 to brake the two reel stands 2, 3.

By the REC or PLAY operation, as shown in FIG. 3, the capstan motor 1 is turned counterclockwise (CC
W), the idler gear 9 is driven through the CCW via the capstan gear 1a, the pulley gear 6a, the driving pulley 6, the timing belt 7, the driven pulley 8, and the small gear 8a.
Rotate to The rotation of the small gear 8a to CW causes the idler lever 12 to rotate to CW, so that the idler gear 9 meshes with the large gear 3a of the reel base 3 and moves the reel base 3 to CW.
To rotate. At this time, one end edge (second restricting means) 12c of the idler lever 12 abuts on the stopper pin 14, so that the idler gear 9 and the large gear 3a of the reel base 3 swing more than necessary. The operation is regulated. The hard brakes 10 and 11 are released in conjunction with a cam (not shown) that performs a pinch roller pressing operation.
In the REC or PLAY mode, there is a gap g between the engaging tongue piece 12a of the idler lever 12 and the regulating tongue piece (regulating means) 17e of the rotating lever 17, as shown in the figure. Does not hinder swing motion.

When the FFWD operation is performed, as shown in FIG. 4, rotation of the cam gear 18 to CW causes the rotation lever 1 to rotate.
7 rotates to the CCW centering on the shaft 5c, the claw 19a engages with the notch 17c, and holds the rotation lever 17 at a predetermined position in the FFWD mode. By the rotation of the rotation lever 17,
The relay gear 16 meshes with the small gear 3b of the reel base 3, and rotates the reel base 3 at high speed to CW. CW of driven pulley 8
The idler lever 12 also rotates to CW due to the rotation of the idler lever 12, but the engagement tongue piece (first engagement means) 1 of the idler lever 12
The edge of 2a is a restricting tongue of the rotating lever 17 (controlling means).
The idler gear 9 and the large gear 3a of the reel base 3 do not mesh with each other because the rotation of the idler gear 9 is restricted.

In the FFWD mode, the CC of the rotating lever 17
Due to the rotation to W, the first operating piece 17g presses the first regulating surface 10a of the hard brake 10, rotates the brake 10 to CCW about the shaft 5d, and releases the braking to the reel base 2. . The second operating piece 17i of the rotating lever 17 presses the second regulating surface 11b of the brake 11, and the brake 11
Is rotated to CW about the shaft 5e to release the braking on the reel base 3.

In the REW mode, the CCW of the cam gear 18
, The rotation lever 17 rotates to CW. As a result, the pawl 19a engages with the notch 17a, and the relay gear 15 meshes with the small gear 2b of the reel base 2. The swinging mechanism and the hard brake opening / closing mechanism of the idler lever 12 operate in the opposite manner to that in the FFWD mode.

[0018]

According to the configuration of the present invention, the idler gear swinging and the hard brake opening / closing operation in the FFWD / REW mode can be performed without providing a dedicated mechanism for swinging the idler gear and opening / closing the hard brake. This is effective in reducing the number of parts and reducing the size and weight of the mechanism.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a main part.

FIG. 2 is a plan view in a STOP mode.

FIG. 3 is a plan view in a REC / PLAY mode.

FIG. 4 is a plan view in the FFWD mode.

FIG. 5 is a sectional view of a main part.

FIG. 6 is a plan view of a conventional mechanism.

[Explanation of symbols]

 2,3 reel base 8 driven pulley (drive gear) 9 idler gear 10,11 hard brake 10a, 11a first regulating surface 10b, 11b second regulating surface 12 idler lever 12a engaging tongue piece 12b, 12c edge (second regulation) Means) 14 Stopper pin 15, 16 Relay gear 17 Rotating lever 17e, 17f Restriction tongue (first restriction tongue) 17g First operation piece (first operation means) 17h, 17i Second restriction piece (second operation means) ) 19 Holding lever

Claims (4)

(57) [Claims] 1. A swing idler means disposed on a bisector of a straight line connecting the centers of a pair of reel bases and meshing with a drive gear, and disposed on the left and right sides of the drive gear and constantly meshed according to an operation mode. A pair of relay gear means meshing with any of the reel bases, and a pair of braking means having first and second regulating surfaces and urged to control the pair of reel bases, respectively. A first actuating means for engaging the relay gear means with the first regulating surface to release the braking of the one braking means, and a pair of engaging means for engaging the second regulating surface to release the braking of the other braking means. And a second actuation means. 2. A swing idler means which is arranged on a bisector of a straight line connecting the centers of a pair of reel stands and meshes with a drive gear, and which is arranged on the left and right sides of the drive gear and always meshes with each other according to an operation mode. A rotating lever having a pair of relay gears meshing with any one of the reel bases and disposed coaxially with the drive gear, a flexible holding lever for holding the rotating lever in each operation mode, A pair of control means having first and second regulating surfaces and urged to brake the pair of reel bases respectively; a first engaging means provided on the idler means; A pair of first regulating means for engaging the first engaging means and regulating the position of the idler means;
A first actuating means for engaging the first regulating surface to release the braking of the one braking means, and a pair of second operating means for engaging the second regulating surface to release the braking of the other braking means; An operating means and a notch which engages with the holding lever are formed integrally with each other. 3. The reel stand driving device according to claim 2, wherein the first and second regulating surfaces are formed on surfaces substantially orthogonal to each other (90 °). 4. A drive gear arranged on a bisector of a straight line connecting the centers of a pair of reel stands, a swing lever having an idler gear and an engagement tongue engaged with the drive gear, and a left and right side of the drive gear. A pair of relay gears, which are always meshed with each other and mesh with any one of the reel bases according to the operation mode, and a rotating lever arranged coaxially with the driving gear; A pair of regulating tongues engaging the engaging tongue and a plurality of cutouts corresponding to the respective operation modes. The reel base driving device, wherein the rotation lever is set to a predetermined mode by engaging the holding lever with the notch.