JPH0476183B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a pinch roller rotation press-contact mechanism for magnetic recording and reproducing devices such as VTRs and tape recorders.

Conventional Structure and Problems The pinch roller rotating pressing mechanism in a conventional magnetic recording/reproducing apparatus, for example, a VTR, has a structure as shown in FIGS. 3 and 4. That is, the third
In the figure, 1 is a main lever, and when this main lever 1 is moved in the direction of arrow a, an engagement pin 2 protruding from the main lever 1 is attached to one end of a rotating lever 4 rotatably attached to a fixed shaft 3. to rotate it in the direction of arrow b. A guide elongated hole 5 is provided at the other end of the rotating lever 4, and an engagement pin is provided in the elongated hole 5 to protrude from one end of a pinch roller arm 7 rotatably attached to a fixed shaft 6. 8 is loosely fitted. Therefore, when the rotation lever 4 rotates in the direction of arrow b, the pinch roller arm 7
rotates in the direction of arrow c. Pinch roller arm 7
A pinch roller 9 is rotatably supported at the other end. Therefore, when the pinch roller arm 7 rotates in the direction of the arrow c, the pinch roller 9 pulls out the tape 11 from the cassette 10 and removes the tape 11 from the cassette 10. As shown in FIG. 4, the tape 11 (omitted in FIG. 4) is brought near the capstan shaft 12. In this state, in the pinch roller arm 7, the fixed shaft 6
An engagement pin 13 provided between the pinch roller 9 and the pinch roller 9
is located in an engagement recess 16 provided at one end of a solenoid lever 15 rotatably attached to the fixed shaft 14. The other end of the solenoid lever 15 is connected to the operating rod 1 of the solenoid 18 via a link 17.
It is connected to 9. Therefore, when the solenoid 18 is operated, the operating rod 19 and the link 17 are pulled, and the solenoid lever 15 is rotated in the direction of arrow d, which causes the pinch roller 9 to move against the tape 11.
The tape 1 is also pressed against the capstan shaft 12.
1 is driven.

However, in the above conventional example, a separate solenoid 18 is required to press the pinch roller 9.
This has the disadvantage of increased weight and increased cost due to extra power consumption, especially for portable typography.
This is a problem with VTRs, tape recorders, etc.

OBJECT OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional tapes, and enables the pinch roller to pull out the tape from the cassette and press it onto the capstan shaft, thereby reducing weight and cost. It is an object of the present invention to provide an advantageous pinch roller rotation pressing mechanism for a magnetic recording/reproducing device.

Structure of the Invention In order to achieve the above object, a magnetic recording and reproducing device according to the present invention includes a rotatable pinch roller arm to which a pinch roller is rotatably attached, a directly movable main lever, and a main lever that is directly movable. For rotation, when the pinch roller arm is moved linearly in one direction, it engages with the first engaging portion provided on the main lever and rotates, thereby rotating the pinch roller arm until the pinch roller approaches at least the capstan shaft. a lever, a first link rotatably connected to the pinch roller arm, a second link rotatably connected to the first link via a moving pin, and a second link rotatably connected to the second link. a rotatable pressure contact lever connected to the main lever; and a second engaging portion provided on the main lever that engages the moving pin and expands both links when the main lever moves further in the direction. and a spring that biases the pinch roller in the direction of pressing the pinch roller against the capstan shaft via the pressing lever and both links.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In these drawings, substantially the same members as those in FIGS. 3 and 4 are given the same reference numerals, and explanations of necessary parts will be omitted.

In FIGS. 1 and 2, 20 is a first link rotatably connected to the pinch roller arm 7 via a connecting pin 20 at one end, and this first link 20 is movable at the other end. It is rotatably connected to one end of a second link 23 via a pin 22. The other end of the second link 23 is rotatably connected to the intermediate portion of the press lever 25 via a connecting pin 24. One end of the pressing lever 25 is rotatably supported by a fixed shaft 26, and a guide elongated hole 27 is formed in the other end. A fixed regulation pin 28 is loosely fitted into the guide elongated hole 22. Furthermore, the other end of the pressure welding lever 25 is provided with an arrow f.
A spring 29 is connected that exerts a biasing force in the direction. (One end of the spring 29 is connected to a fixing member, not shown). Further, the main lever 1 is provided with a rectangular notch 30, and one side edge 30a of this notch 30 can be engaged with the movable pin 22.

Next, the operation of the magnetic recording/reproducing apparatus having the above configuration will be explained. First, in the state shown in FIG. 1, when the main lever 1 is linearly moved in the direction of the arrow a, the engagement pin 2 of the main lever 1 engages with one end of the rotating lever 4, and moves it in the direction of the arrow b. This causes the pinch roller arm 7 to rotate.
rotates in the direction of arrow c. As a result, the pinch roller 9 pulls out the tape 11 from the cassette 10,
It is brought to the vicinity of the capstan shaft 12. During this operation, the pressure welding lever 25 is pulled by the spring 26, and the regulating pin 28 remains engaged with one side edge of the guide elongated hole 27, so that the position of the connecting pin 24 is maintained at the same position. In this state, the first link 20 is continuously opened to the second link 23. Immediately after the tape 11 has been pulled out, the engagement pin 2 is located below the guide plane 4a provided at one end of the rotating lever 4, and this guide plane 4a is parallel to the moving direction a of the main lever 1. Therefore, the rotation lever 4 no longer rotates, and
One side edge 3 of the notch 30 formed in the main lever 1
0a contacts the moving pin 22. In this state, if the main lever 1 is further moved in the direction of arrow a,
The moving pin 2 abuts one side edge 30a of the notch 30
2 moves in the same manner, and both links 20 and 23 are further expanded. As a result, the pinch roller arm 7 further rotates slightly in the direction of arrow c, and the pinch roller 9 comes into contact with the capstan shaft 12. While the pinch roller arm 7 can rotate in this manner, the pressing lever 25, which is tensioned by the spring 29, does not rotate, and therefore the position of the connecting pin 24 is maintained constant. However, after the pinch roller 9 contacts the capstan shaft 12, even if the movable pin 22 is moved by further movement of the main lever 1 in the direction of the arrow a and both links 20 and 23 are expanded, the pinch roller arm 7 is no longer in contact with the capstan shaft 12. Since the connecting pin 21 cannot be rotated, that is, the connecting pin 21 cannot be moved, the expansion of both links 20 and 23 is achieved by the rotation of the press lever 25 in the direction of the arrow g, resisting the biasing force of the spring 29 in the direction of f. It will be absorbed. As a result, the biasing force of the stretched spring 29 is transmitted via the pressing lever 25, both links 20 and 23, and the pinch roller arm 7, and the pinch roller 9 is pressed against the capstan shaft 12, thereby driving the tape as required. It is something that can generate force.

In the illustrated embodiment, the pinch roller 9 is brought close to the capstan shaft 12 when the tape 11 is pulled out by rotating the rotating lever 4. The roller 9 is the capstan shaft 12
It goes without saying that you may contact them.

Effects of the Invention As explained above, in the pinch roller rotation press-contact mechanism of the magnetic recording/reproducing apparatus according to the present invention, the pinch roller can pull out the tape from the cassette.
This is achieved by a rotating lever that cooperates with the first engaging part (engaging pin) of the main lever, and presses the pinch roller against the capstan shaft with the second engaging part (one side of the notch) of the main lever. This is achieved by a moving pin that cooperates with the rim), a pair of links, a lever for pressure contact, and a spring, so all movements can be transmitted mechanically, which has the effect of being significantly advantageous in terms of weight and cost. .

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing a pinch roller rotation pressure welding mechanism according to an embodiment of the present invention in its non-operating state, FIG. 2 is a schematic plan view showing the same mechanism in an operating state, and FIG. 3 is a conventional A schematic plan view showing the pinch roller rotation pressure welding mechanism in its non-operating state;
FIG. 4 is a schematic plan view showing the mechanism in operation. DESCRIPTION OF SYMBOLS 1... Main lever, 2... Engaging pin (first engaging portion, 4... Rotating lever, 7... Pinch roller arm, 9... Pinch roller, 12... Capstan shaft, 20... Third 1 link, 22... moving pin, 23... second link, 25... pressure contact lever, 29... spring, 30a... one side edge of notch (second engaging portion).

Claims (1)

[Claims] 1. A rotatable pinch roller arm to which a pinch roller is rotatably attached, a linearly movable main lever, and a first engagement provided on the main lever when the main lever is linearly moved in one direction. a first link rotatably connected to the pinch roller arm; a first link rotatably connected to the pinch roller arm; a second link rotatably connected to the first link via a moving pin;
a rotatable press-contact lever rotatably connected to the link; and a press-contact lever provided on the main lever that engages the moving pin and spreads both links when the main lever moves further in the direction. A pinch roller rotating press-contact mechanism for a magnetic recording/reproducing device is comprised of a second engaging portion, a press-contact lever, and a spring that biases the pinch roller in a direction to press the pinch roller against a capstan shaft via both links.