JPH0237145Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a pinch roller crimping device for a video tape recorder.

BACKGROUND ART In general, in a video tape recorder, in order to make the tape pulled out from a cassette and loaded run at a constant speed along a predetermined path, the tape is pressed onto a capstan shaft with a pinch roller, and this capstan shaft is adjusted to the tape running speed. It is designed to rotate at the same circumferential speed. This pressure bonding of the pinch roller is very often performed using a solenoid because it has a simple structure and can be driven reliably. However, in the past, for example, an arm supporting the pinch roller was directly connected to the rod of the solenoid via a connecting rod or the like, so that the driving force was directly transmitted to the pinch roller. However, in the conventional crimping mechanism, the solenoid is arranged parallel to the crimping direction, and therefore, when the solenoid is crimped onto the capstan shaft, the force required to hold the crimping mechanism must be entirely absorbed by the solenoid. Therefore, in order to maintain the pinch roller in the pressed state, it was necessary for the solenoid to constantly exert a large holding force during that time. Moreover, this also resulted in a considerable increase in the power consumption of the solenoid. Moreover, the tape loading mechanism and the loading motor that drives it are arranged closely around the pinch roller and capstan shaft, so space is extremely narrow and limited.
Selection of the solenoid installation position was extremely difficult due to space constraints.

DISCLOSURE OF THE INVENTION This invention was developed in view of the above points, and its purpose is to isolate the driving means such as a solenoid from the influence of the pressing force after pinch roller crimping, and to minimize the holding force of the crimping by the driving means. .

The purpose of this is to provide a drive means disposed along an axis that intersects at a predetermined angle with the direction in which the pinch roller is pressed onto the capstan shaft, and a lever that moves forward or backward along the intersecting axis when driven by the drive means. a biasing means that moves in the pressing direction in conjunction with the forward or backward movement of the lever body and urges the pinch roller in the pressing direction, and is arranged near the forward or backward movement path of the lever body. This can be achieved by using as a main component a pressing means that moves in a direction intersecting the path in conjunction with the forward or backward movement to further press the crimped pinch roller in the capstan axial direction. .

According to this invention, a driving means such as a solenoid is arranged on an axis that intersects at a predetermined angle with the direction in which the pinch roller is pressed onto the capstan shaft, and its driving force is applied to forward or backward movement along the intersecting axis. The lever body transmits a force to the pinch roller through a biasing means in conjunction with the forward or backward movement, and biases the pinch roller in the crimping direction;
In addition, since the pressed pinch roller is further pressed in the axial direction of the capstan by the pressing means, when the pinch roller is pressed, the drive means is completely removed from the line of action of the pressing force, and the pressing force is It will be almost completely cut off from the influence. Moreover, the pinch roller can be reliably held in the pressed state only by the urging by the urging means and the pressing action by the pressing means. Therefore, the load applied to the driving means after the crimping is reduced, and the holding force of the crimping by the driving means for holding the pinch roller in the crimping state can be minimized.

Moreover, the pinch roller can be held in a crimped state with minimal force. As a result, the amount of energy consumed by the driving means can be reduced.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the invention will be described in detail with reference to the drawings.

Figure 1 shows a video tape recorder (hereinafter referred to as VTR).
This is an example of a pinch roller crimping device (referred to as . The capstan shaft 11 is rotationally driven in a predetermined direction by a capstan drive motor (not shown) via a flywheel (also not shown). An arm 12 is supported on one side of the arm 12 by a shaft 13 so as to be horizontally rotatable. The arm 12 is formed in a U-shape with an open end, and a capstan shaft 11 is attached to the open end.
A pinch roller 14 is rotatably supported. A U-shaped frame 121 is formed protruding from one end of the arm 12, and rollers 32, 32, which will be described later, are pressed against the upper and lower sides of the frame 121.

A solenoid 15 is installed at a position on an axis R that is substantially orthogonal to an axis L along the pinch roller pressing direction on the base 10 and away from the axis L. A cam lever 17 is pivotally mounted to a rod 16 of the solenoid 15 so as to be horizontally rotatable. Cam lever 17
One end of the pinch roller 1 is attached along the orthogonal axis R.
It extends to one side of 4. A cam piece 18 is provided at one end of the cam lever 17 and projects toward the pinch roller 14 at a predetermined height h. Cam piece 1
8, an inclined surface 181 that slides into contact with a shaft 33 provided on a second lever 30, which will be described later, via a collar 34.
is formed so as to taper at a constant angle from the proximal end to the distal end. Further, an elongated hole 19 is formed near the tip of the cam lever 17 along the longitudinal direction.

A first lever 20 is arranged on the base 10 below the cam lever 17 so as to be substantially parallel to the cam lever 17. One end of the first lever 20 is pivotally mounted on the base 10 by a shaft 21. The other end extends in the direction of the solenoid 15, and one end of a spring 22 fixed on the base 10 via a fixture is attached to that end. As a result, the first lever 20 is urged toward the pinch roller 14 using the shaft 21 as a fulcrum. Also,
The rotation of the first lever 20 in the direction of the pinch roller 14 due to the bias of the spring 22 is restricted by contact with a locking piece 23 provided on the base 10 . Furthermore, a sliding shaft 25 that is slidably fitted into the elongated hole 19 of the cam lever 17 is protruded from the upper surface of the first lever 20 .

A second lever 30 is disposed between the pinch roller 14 on the base 10 and the cam lever 17. The second lever 30 is formed in a substantially U-shape with one end open, and its base end is supported by a shaft 31 so as to be rotatable in the horizontal direction. second lever 3
Protrusions 301, 301 are formed protrudingly on the upper and lower sides of one side of the arm 12, and rollers 32 that are pressed against and slide against the upper and lower sides of the side surface of the frame 121 provided on the arm 12 can roll on these protrusions 301, 301, respectively. installed. Furthermore, a shaft 33 is attached between the upper and lower open ends of the second lever 30, and a cylindrical collar 3 is attached to the outer periphery of the shaft 33.
4 is loosely fitted. The shaft 33 is the pinch roller 14
When the cam lever 17 is pressed onto the capstan shaft 11, the cam lever 17 comes into sliding contact with an inclined surface 181 formed on the cam piece 18 of the cam lever 17 via the collar 34. At this time, the rotation of the collar 34 reduces the frictional force between the two.

In this embodiment, illustrations of the loading ring, rotating cylinder, and peripheral mechanisms thereof are omitted for the sake of simplicity.

Next, the operation of the apparatus of this embodiment having the above configuration will be explained.

First, the pinch roller 14 shown in FIG.
h. ),
the tape is loaded along a predetermined path;
Next, when the VTR is operated for recording or playback, the solenoid 15 is energized and the rod 16 is attracted and shortened. Then, the cam lever 17 moves in the same shortening direction, and the cam piece 18 moves as shown in FIG.
The shaft 33 of the second lever 30 is pressed against the inclined surface 181 via the collar 34. Then, along with this movement, the shaft 33 moves along the inclined surface 181 from the base end toward the distal end while slidingly contacting the same. Then, as shown in FIG. 3, the second lever 30 rotates around the shaft 31, and its rollers 32, 32
It is pressed against the side surface of the frame portion 121 of No. 2. When the cam lever 17 further moves in the direction of the solenoid 15, the pinch roller 14 is urged by the rollers 32, 32 due to the rotation of the second lever 30.
The arm 12 is moved in the direction of the capstan shaft 11 using the shaft 13 that supports the arm 12 as a fulcrum. As a result, the pinch roller 14 is pressed against the capstan shaft 11 with the tape A sandwiched therebetween, as shown in FIG. Then the second
The lever body 30 is connected to the frame portion 121 of the rollers 32, 32.
It is positioned and locked in the crimp direction by the reaction force caused by pressing against the side surface.

In this state, when the cam lever 17 is further moved by the urging of the solenoid 15, the position of the second lever 30 is restricted in the crimping direction by contact with the rollers 32, 32 and the side surface of the frame portion 12, so as shown in FIG. As shown, the inclined piece 181 of the cam piece 18 passes over the shaft 33 of the second lever 30 as the cam lever 17 moves, and its top 182 rides on the shaft 33. As a result, the cam lever 17 rotates in a direction opposite to the pinch roller 14, as shown by an arrow 100, about the point supported by the rod 16 of the solenoid 15 as a fulcrum. Then, the sliding shaft 25 of the first lever 20 is urged in the direction of the arrow 100 by the inner surface of the elongated hole 19. As a result, the first lever 20 rotates about the shaft 21 in a direction opposite to the pinch roller 14 as shown by an arrow 101 against the bias of the spring 22.
Also, this causes the spring 22 to move toward the arrow 102 in FIG.
Stretch as shown in . When the spring 22 is expanded,
The returning force is transmitted from the first lever 20 to the cam lever 17 and from the cam lever 17 to the second lever 30, and through the rollers 32, 32, the pinch roller 14 is moved in the direction of the capstan shaft 11 as shown by the arrow 103. further suppressed.

This pressing force is constantly applied to the pinch roller 14 with a constant force while the solenoid 15 is attracted and the spring 22 is extended, and its movement in the return direction is suppressed. Therefore, the pinch roller 14 can be reliably held in a state in which it is pressed against the capstan shaft 11.

On the other hand, when the VTR operation is completed and the solenoid 15 is turned off, the cam lever 17 protrudes and returns to its original position due to the extension of the rod 16, and the pinch roller 14 moves the capstan shaft 11 by an operation substantially opposite to that described above.
It returns to its original position as shown in FIG.

Incidentally, contrary to the embodiment, the pinch roller may be pressed by the protruding operation of the solenoid 15. Moreover, it is also possible to reverse the arrangement relationship to that in the embodiment.

Furthermore, the second lever 30 may be omitted, and the arm 12 supporting the pinch roller 14 may be provided with a member having the same function as the shaft 33 and the collar 34.

FIG. 6 shows an example of this, and the same parts as in the above embodiment are given the same reference numerals, and the explanation thereof will be omitted.

In FIG. 6, the cam lever 17 and the first lever 20 are arranged closer to the side of the pinch roller 14. Cam lever 1 of arm 12
A shaft 41 is provided between the upper and lower sides of one side facing 7, and a collar 42 is loosely fitted around the outer periphery of this shaft 41. The shaft 41 is provided so as to face an inclined surface 181 formed on the cam piece 18 of the cam lever 17, and the shaft 41 is provided so as to face the inclined surface 181 formed on the cam piece 18 of the cam lever 17.
When it is crimped to the surface, it slides into contact with the inclined surface 181 and moves along the surface 181 in the direction of its tip. As a result of this movement, the pinch roller 14 moves in the direction shown by the arrow 103 in FIG. 7 and is pressed against the capstan shaft 11. In that case, the arm 12 does not require the frame portion 121. According to this, the configuration of the crimping mechanism is further simplified compared to the above embodiment, and the installation space thereof can be further reduced.

According to the above embodiment, the following effects can be expected.

The solenoid 15 is disposed at a remote location on the axis R perpendicular to the axis of action of the pinch roller 14 in the pressing direction, and is almost completely isolated from the influence of the pressing force during pressing. Therefore, the load applied to the solenoid after crimping can be significantly reduced or eliminated, and the holding force can be minimized or made unnecessary. Therefore, total power consumption can be reduced.

The top part 182 provided on the cam piece 18 rides on the shaft 33 due to the rotation of the cam lever 17, and the first
The pinch roller 14 is held more firmly in the pressed state by the return force caused by the extension of the spring 22 caused by the rotation of the lever 20, so that the pinch roller 14 is more securely held, and this alone provides sufficient holding force. is obtained.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of the pinch roller crimping device of the present invention, FIGS. 2 to 5 are plan views illustrating the crimping operation thereof, and FIG. 6 is a perspective view showing another embodiment of the pinch roller crimping device of the present invention. FIG. 7 is a plan view illustrating its operation. 10...Base, 11...Capstan shaft, A
... Tape, 14 ... Pinch roller, L ... Axis along the crimping direction, R ... Cross axis, 15 ... Solenoid (driving means), 17 ... Cam lever (lever body), (18 ... Cam piece, 181... Inclined surface, 3
0...Second lever, 33, 41...Shaft, 34,
42...Color, 121...Frame, 32,32...
...Roller) urging means, (19...long hole, 25...
Sliding shaft, 20...first lever, 22...spring,
182...top) presser means.

Claims (1)

[Claims for Utility Model Registration] (1) A device for crimping a pinch roller to a capstan shaft provided on a base via a tape, the pinch roller being attached to an axis intersecting the crimping direction on the base at a predetermined angle. a lever body that moves forward or backward along the intersecting axis when driven by the driving means; and a lever body that moves in the crimp direction in conjunction with the forward or backward movement of the lever body. a biasing means for biasing the pinch roller in the crimping direction; and a biasing means disposed near the forward or backward movement path of the lever body, and configured to move in a direction intersecting the path in conjunction with the forward or backward movement. A pinch roller crimping device comprising: pressing means for further pressing the crimped pinch roller in the axial direction of the capstan. (2) The pinch roller crimping device according to claim 1, wherein the driving means is constituted by a solenoid.