JPH064429Y2 - Pinch roller drive - Google Patents

Description

Detailed Description of the Invention [Outline] By switching one of the three states of the pinch roller by the movement of one cam plate, the drive source is unified and the mechanism is made thin.

[Field of Industrial Application] The present invention relates to a driving device for a pinch roller that requires three types of position control.

[Conventional technology]

In decks such as DAT (digital audio tape) and VTR (video tape recorder), the pinch rollers take three positions (cassette insertion / ejection position, pinch-off position, play position). A drive mechanism for moving the is required.

In the conventional pinch roller driving device, a mechanism (motor a → gear drive) for moving the pinch roller from the cassette insertion / ejection position (in the mouse of the cassette) to the pinch off position,
Some include a mechanism (motor b → rack) for moving from the pinch-off position to the play position.

Since this method uses two drive sources (motors a, b, etc.), the structure is complicated and is not suitable for downsizing.

FIG. 3 shows a one-drive-source type pinch roller driving mechanism that moves the pinch roller control lever 32 by using the groove cam 31 formed on the rotating disk 30.

[Problems to be solved by the invention]

The method of FIG. 3 has the advantage that only one drive source (motor) is required, but cannot be thinned because of the combined thickness t of the disk 30 and the lever 32. Further, unless the disc 30 has a large diameter, the movement amount of the lever 32 cannot be made large, so that there is a disadvantage that an extra space near the capstan is used.

An object of the present invention is to provide a thin one-driving-source type pinch roller driving device in which the position of the pinch roller can be controlled by moving one cam plate in parallel.

[Means for solving problems]

The present invention is an arm (2) that pivotally supports a pinch roller (1).
The gear (4) of (4) is engaged with the gear (5) in which the cams (7) and (8) having different rotational positions are coaxially integrated, and the cam plate (10) driven by the pinion (11) is at a different position. The cams (A) and (D) are abutted against the cams (7) and (8) sequentially with the movement of the cam plate, and the pinch roller (1) is moved to three positions. It is characterized by that.

[Action]

Since the position of the pinch roller can be switched in three ways by the movement amount of one cam plate, the overall thickness can be reduced. Further, since only one drive source is required for the cam plate, the structure is simple and the size can be reduced.

〔Example〕

FIG. 1 is an assembled perspective view showing an embodiment of the present invention, in which 1 is a pinch roller, 2 is a pinch roller arm which pivotally supports the pinch roller, and 3 is a pinch roller 1 which is a capstan (see FIG. 2). No. 20) of the arm 2 is a gear interposed between the U-shaped portion 2a of the arm 2. One end 3a of the spring 3 engages with one side 4a of the gear 4, and the other end 3b has a U-shaped portion 2
It engages with one side 2b of a.

5 is a gear that meshes with the gear 4, and its shaft 6 has cams 7, 8
Are integrated. A return spring 9 has one end 9a engaged with one side 5a of the gear 5 and the other end 9b fixed to a chassis or the like.

Reference numeral 10 denotes a cam plate, which linearly moves by engaging a pinion 11 driven by a motor with the rack 10a. This cam plate 10 has a cam A formed in a recess 10b.
And the cam D formed on the convex portion 10c. Cam A is in the plane that abuts C of cam 8, and cam D is cam 7
It is in the plane that collides with the E part of.

The operation will be described below with reference to FIG. 2 is at the cassette insertion / ejection position of the cam plate 10, and the cam A is the cam 8
It collides with the C section of. When the pinion 11 is rotated counterclockwise from this state, the cam plate 10 advances to the right in FIG. 2, and the cam A presses the C portion of the cam 8, so that the cam 8,
The cam 7 and the gear 5 integrally rotate counterclockwise. As a result, since the cam 4 rotates clockwise, the arm 2 also rotates in the same direction, and the pinch roller 1 rotates from the cassette insertion / ejection position to the pinch off position 1 '.

When the pinion 11 further rotates counterclockwise, the cam plate 1
Since the cam D of 0 abuts the E portion of the cam 7, the gear 5 further rotates counterclockwise, and the arm 2 moves to the play position 2 ″.
Since the pinch roller 1 ″ rotates up to the capstan 2
Crimp to 0.

When the pinion 11 is rotated in the opposite direction to the above operation, the cam 10 retracts in accordance with the amount of rotation, and the gear 5 rotates clockwise by the force of the return spring 9, so that the pinch roller 1 ″ moves to the pinch off position 1 'Or return to the cassette insertion / ejection position 1.

[Effect of device]

As described above, according to the present invention, the position of the pinch roller can be controlled in three ways by using only one cam plate, so that the device can be made thin and only one drive source is required, so the structure is simple. There is an advantage.

[Brief description of drawings]

 FIG. 1 is an assembled perspective view showing an embodiment of the present invention, FIG. 2 is a plan view showing the operation of the present invention, and FIG. 3 is a configuration diagram of a conventional pinch roller driving mechanism.

Claims (1)

[Scope of utility model registration request] 1. A gear (5) in which cams (7) and (8) having different rotational positions are coaxially integrated with a gear (4) of an arm (2) pivotally supporting a pinch roller (1). Then, the cams (A) and (D) at different positions of the cam plate (10) driven by the pinion (11) are made to sequentially abut against the cams (7) and (8) as the cam plate moves. A pinch roller driving device having a structure for moving the pinch roller (1) to three positions.