JPH03100956A - Magnetic tape unit - Google Patents

Abstract

PURPOSE:To reduce the number of parts and to reduce man-hour for production by abutting first and second control plates to an FF.FR idler arm equipped with a projecting part, and regulating the turn of the FF.FR idler arm. CONSTITUTION:In a play mode, a cam plate 12 is turned while being interlocked with a cam gear 16 and a control post 13 pushes an abutting part 31 of a first control plate 11. Accordingly, a C part of the plate 11 is abutted to the side surface of an FF.FR idler arm 4 and a D part of the plate 11 is abutted to the projecting part of the arm part 4. Thus, the tun of the arm 4 in clock-wise and counter-clock-wise directions with the idler post 6 as a center is blocked. Accordingly, when a tape is taken up, an idler gear 5 is turned and a right side reel 2 is rotated. However, the arm 4 is not turned. When the tape is rewound, the rotation torque of the gear 5 is transmitted to a left side reel 1 and the arm 4, however, is not turned.

Description

[Detailed Description of the Invention] [Industrial Field of Application] This invention provides FF/FR switching depending on the direction of rotation of the idler gear.
This invention relates to a magnetic tape device in which an FF-FR idler gear engages one of a pair of reels via an idler arm.

[Prior Art] As a conventional magnetic tape device, for example, Japanese Patent Laid-Open No. 63-21
The one shown in Japanese Patent No. 3147 is known.

In this case, the winding and unwinding operations of the tape are performed by rotating the cam gear, which allows the first plate cam and the second plate cam to overlap each other.
The plate cam moves and eventually releases the support lever, rotates the support lever, and meshes the idler provided at the tip of the support lever with the reel.

[Problems to be Solved by the Invention] In the magnetic tape device configured as described above, parts such as a locking arm and a support lever are interposed between the movement of the plate cam and the release of the restraint of the support lever. There were problems in that the cost increased and the number of assembly steps also increased.

The present invention has been made to solve these problems, and aims to provide a magnetic tape device with a reduced number of parts, manufacturing costs, and assembly man-hours.

[Means for Solving the Problems] A magnetic tape device according to the present invention includes first and second control plates that are interlocked with the rotation of a cam gear, and an FF-FR idler gear that meshes with a reel at a distal end. and an FF-FR idler arm having a convex portion at the base end.

[Operation] In the present invention, the rotation of the FF-FR idler arm is restricted by the first and second control plates coming into contact with the FF-FR idler arm having the convex portion.

[Example] Fig. 1 and Figs. 3 to 7 are plan views of main parts of a digital audio tape recorder (DAT) which is a magnetic tape device, and 1 is a reel shaft 9 fixed to a reel base. 2 is a left reel that is freely supported; 2 is a right reel that is rotatably supported on a reel shaft 8 fixed to a reel base; 3 is an FF-FR idler gear that is rotatably provided on an idler gear center shaft 7; 5 is an idler boss. 4 is an FF-FR idler arm supported by the idler center shaft 7 and rotatably supported by the idler post 6, and has the shape shown in FIG. 2E; 4a is the FF-FR idler arm 4; This is a convex portion formed at the end of the .

11 is a first control plate having the shape shown in FIG. 2A and has a limit post 18 and a lever post 19; 10 is a first control plate provided overlapping the first control plate 11 and having the shape shown in FIG. 2B. 2, a control plate 12 is rotatable around the shaft 15, and has a control post 1-3 at one end and a cam post 14 at the other end; 16 is a cam gear that rotates around the shaft 1; Reference numeral 21 denotes a limit plate having the shape shown in FIG. 2C, which is provided overlapping the first control plate 11, and 20 is a sub-limit plate having the shape shown in FIG. 2D, which is provided overlapping the limit plate 21.

22 is a plunger, 23 is a limit plate 2 at one end
1 is a first spring that urges the limit plate 21 clockwise; 24 is a second spring provided between the limit plate 21 and the sub-limit plate 20; 25;
26. is a third spring provided between the first control plate 11 and the second control plate 10;
27.28 are the first, second and third units installed on the base.
, the spring force of the third spring 25 causes the first
The control plate 11 and the second control plate 10 attract each other, but the second guide post 2
7 comes into contact with the M portion of the second control heel plate 10,
The third guide post 28 comes into contact with a portion of the first control plate 11, and their movement is restricted.

Next, the operation of the DAT having the above configuration will be explained. In the magnetic tape standby mode in which rotation of the left reel 1 and the right reel 2 is prevented by a reel brake (not shown), the reel motor (not shown) rotates clockwise or counterclockwise, for example, to load a cassette. The FF-FR idler arm 4 is designed not to oscillate even when the FF-FR idler arm 4 is turned.

That is, at this time, as the cam gear 16 rotates, the arm/cam plate 12 rotates clockwise around the axis l+J, and the control post 13 presses the contact portion 30 of the second control plate 10, so that The B part of the first control plate 11 comes into contact with the G part of the FF-FR idler arm 4, and the second control plate 10
Since the A part of the FF-FR idler arm 4 is in contact with the convex part 4a of the FF-FR idler arm 4, the FF centering on the idler post 6 is
Clockwise and counterclockwise rotation of the F-FR idler arm 4 is prevented (see FIG. 1).

Next, the magnetic tape is pulled out from the cassette through a tape loading mechanism (not shown) by the rotation of the cam gear 16, and in the play mode state in which the magnetic tape is in contact with a rotating drum (not shown), the cam gear 16 is rotated. In conjunction with the rotation, the arm/cam plate 12 rotates counterclockwise around the shaft 15, and the control post 13 presses the contact portion 31 of the first control plate 11.

Therefore, 0 part of the first control plate 11 is FF
・Since the FR idler arm 4 is in contact with the H part, and the D part of the first control plate 11 is in contact with the 5 part of the convex part 4a of the FF/FR idler arm 4, the FF- FR idler arm 4 clock,
Counterclockwise rotation is prevented. Therefore, during play when the magnetic tape is wound, the idler gear 5 rotates, and the rotational torque is transmitted to the play idler gear (not shown).
The right reel 2 is rotated through the FF-FR idler arm 4, and a clockwise or counterclockwise rotational torque is applied to the FF-FR idler arm 4. However, when rewinding the magnetic tape, the rotational torque of the idler gear 5 is transferred to the left reel 1 via the play idler gear.
However, as in the case of magnetic tape winding, F
The F/FR eye arm 4 does not rotate.

Further, when the control post 13 presses the contact portion 31 of the first control plate 11 and the first control plate 11 moves to the right, the lever post 19 of the first control plate 11 moves to the F of the sub-limit plate 20. The sub-limit plate 20 rotates counterclockwise, and in conjunction with this, the limit plate 21 rotates counterclockwise via the first spring 23.
The plunger 22 enters the suction state (see FIG. 3).

Next, when the first control plate 11 is moved to the left by the rotation of the cam gear 16, the limit plate 21 and the sub-limit plate 20 do not rotate due to the attraction force of the plunger 22, and the limit plate 21
The limit post 18 of the first control plate 11 is in contact with the FF-FR idler arm 4, and the FF-FR idler arm 4 is in a free state in which rotation is not prevented from rotating from the first control plate 11 and the second control plate 10, that is, the magnetic tape The state changes from the play state to the FF/FR state (see Fig. 4).

In this state, rotate the reel motor and idler gear 5.
By rotating clockwise, the FF/FR idler arm 4 rotates clockwise around the idler post 6, and as a result, the FF-FR idler gear 3 rotates around the right reel 2.
, and the magnetic tape enters the FF mode (see Fig. 5).

In addition, by rotating the reel motor and rotating the idler gear 5 counterclockwise, the FF/FR idler arm 4 rotates counterclockwise around the idler post 6, and as a result, the FF-FR idler gear 3 is moved to the left reel 1. , and the magnetic tape enters the FR mode state (see Fig. 6).

When the magnetic tape is in the FF mode or FR mode, by releasing the attraction of the plunger 22, the limit plate 21 and the sub-limit plate 20 are rotated clockwise by the first spring 23, and the E of the limit plate 21 is rotated clockwise. The contact between the control plate 11 and the limit post 18 of the first control plate 11 is released. Therefore, the second spring 25
The spring force causes the first control plate 11 to move to the left, and as a result, the left reel 1 and the right reel 2 are instantly braked by the cooperation of the first control plate 11 and the second control plate 10. When in this brake mode, the rotation of the left reel 1 and the right reel 2 is stopped (see Figure 7).
Since the B part of the first control plate 11 is in contact with the G part of the FF-FR idler arm 4, the FF-FR
The R idler arm 4 is prevented from rotating clockwise around the idler post 6, and even if the idler arm 4 is rotated clockwise and the FF/FR idler gear 3 meshes with the left reel 1, the reel The motor is stopped and there are no problems.

Further, due to the rotation of the cam gear 16, the control post 13 of the cam plate 12 presses the contact portion 30 of the second control plate 10, changing the position of the second control plate 10 from the standby mode shown in FIG. 1 to the standby mode shown in FIG. When the reel 1 is moved to an intermediate position between the winding mode and the reel 1, the brake of only the left reel 1 is released. As a result, the idler arm 4 is rotated clockwise, and the FF is applied to the left reel 1.
- After the FR idler gear 3 meshes, the left reel 1 is rotated counterclockwise by the rotation of the reel motor, the magnetic tape is stored in the cassette, and the magnetic tape enters standby mode.

In the above embodiment, a DAT was explained as the magnetic tape device, but it goes without saying that the present invention can be applied to devices other than DAT.

[Effects of the Invention] As explained above, according to the magnetic tape device of the present invention, the first and second control plates come into contact with the FF-FR idler arm having the convex portion, thereby achieving the following effects.
Since the rotation of the FF-FR idler arm is regulated, the number of parts for regulating the rotation of the FF-FR idler arm is reduced compared to the conventional model.
This has the effect of reducing manufacturing costs and manufacturing man-hours.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a plan view of essential parts of a DAT showing an embodiment of the present invention, FIGS. 2A to 2E are plan views of the components shown in FIG. 1, and FIG. Figure 1 is a plan view of the DAT in play mode, Figure 4 is a plan view of the DAT in Figure 1 before FF-FR idler arm swing in FF/FR mode, Figure 5 is a plan view of the DAT in Figure 1 before swinging. FIG. 6 is a plan view of the DAT shown in FIG. 1 in the FR mode, and FIG. 7 is a plan view of the DAT shown in FIG. 1 in the brake mode. In the diagram, 1 is the left reel, 2 is the right reel, and 3 is the F
4 is an FF/FR idler gear, 4 is an FF/FR idler arm, 4a is a convex portion, 5 is an idler gear, 6 is an idler post, 10 is a second control plate, 11 is a second control plate, and 16 is a cam gear. In each figure, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] a pair of reels rotatably provided on the reel base; and a pair of reels rotatably provided on the reel base. an idler gear provided on the provided idler post; and an FF/FR idler arm, the base end of which is rotatably provided to the idler gear, and the distal end provided with an FF/FR idler gear that can mesh with the reel. Preparation, said FF・F
Rotation of the R idler arm about the idler post is regulated by the first and second control plates coming into contact with the FF/FR idler arm having a convex portion at its end. Magnetic tape device.