JPS58220265A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent a plastic deformation of a pinch roll, by a driving the pinch roll interlocking to the driving of a loading hole and detaching the pinch roll slightly from a capstan in a loading state of a tape. CONSTITUTION:A record locking switch is turned on in a recording mode, and an electric power supply switch is turned off. Thus the driving of a tape is stopped, and at the same time the revolution of a rotary drum is stopped. At the same time, a pinch roll 3 has a slight displacement from the press-contact position to the unloading position with a displacement of a lever 7. Then the roll 3 reaches a position 3' shown by a 1-dot chain line and is detached from a capstan 4. In this case, the roll 3 is displaced slightly from the loading position to the unloading position and reaches positions 2a'-2e' shown by alternate long and short dash line since the driving mechanisms of poles 2a-2e are coupled to the lever 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording/reproducing device, and includes a mechanism for slightly separating a pinch roller from a position where it is pressed against a capstan when the tape is stopped and the tape is in a loading state in a song writing mode. To provide a magnetic recording and reproducing device which prevents plastic deformation of the pinch roller and which does not cause the tape to be strongly rubbed by a video head when the tape is brought into loose contact with the rotating drum and the rotating drum is started to rotate again. The purpose is to provide.

In general home VTRs, separate drive mechanisms are used for the rope ink ball and the pinch roller, and the two are driven independently without being related to each other. Conventionally, a plunger solenoid is used for this pinch roller drive, but the VT
Now that it is desired to reduce the size of R, it is better not to use a plunger solenoid. For this reason, it is desirable that the pinch roller be driven in conjunction with the loading ball using a lever or the like, without using a plunger remade.

By the way, conventionally, when recording is interrupted by stopping the running of the tape in the recording mode, the tape is kept in a loaded state.

When turning on this state (for example, if you turn on the recording port/vine switch and turn off the power switch, the tape will stop running and the rotating drum will stop rotating, but the tape will not reach the outer circumferential surface of the rotating drum.) and is in pressure contact with the pinch roller capstan.Also, if the recording lock switch is turned on while the power switch is on to obtain the above condition, the power will be turned off after a predetermined period of time has elapsed. As a result, the rotation of the rotating drum is stopped as in the above case, while the tape is stretched over the rotating drum and the pinch roller is in pressure contact with the capstan.

In other words, in any case, in the conventional mode in which tape running is stopped and the tape is held in a loaded state, the pinch roller is in pressure contact with the capstan, and the tape is in pressure contact with the outer circumferential surface of the rotating drum. It is stretched with a certain tension. Therefore, if this mode is left in this mode for a long time, there is a risk that the pinch roller will be plastically deformed due to pressure contact with the capstan, and when the power is turned on again from this mode, the tape will start rotating due to the rotation of the rotating drum. There was a drawback that the tape was rubbed instantly and strongly by the video head, which could cause the tape to wear out.

The present invention is configured such that the pinch roller is driven in conjunction with the drive of the rope and the in-gepole, and the pinch roller is very slightly separated from the capstan when the tape is held in the loading state. The above-mentioned firepower is prevented, and an example thereof will be described below with reference to the drawings.

The figure shows a plan view of an embodiment of the magnetic recording angle main device according to the present invention. In the figure, when the cassette half 1 is installed in the main body, loading balls (hereinafter referred to as balls J) 2a to 2θ are in the position shown by broken lines inside the cassette half 1 in the unloading state, while the pinch The roller 3 is located at a relatively large distance from the capstan 4, as shown by the broken line.

Here, by turning on the shake/f switch (not shown), the balls 2a to 2e are displaced in the direction of the arrow and reach the position shown by the solid line. Due to the displacement of the balls 2a to 2θ, the magnetic tape 5 is pulled out from the cassette half 1, loaded onto a predetermined tape running path, and comes into contact with the rotating drum 6. ball 2
Ball at the same time as the displacement of a to 2e? The lever T, which is interlocked with the drive mechanisms ``a to 2e, is displaced, and the pinch lever T moves from the position indicated by the dashed line to the position indicated by the solid line, and is crimped onto the capstan 4. In this state, the tape is pressed. is run to perform recording and reproduction.Fia is a supply reel, 8b is a take-up reel, 9 is a full-width erasing head, 10 is an audio erasing head, and 11 is an audio control head.

In recording mode, record lock switch (not shown)
Turn on the power switch (not shown) and turn off the power switch (not shown). As a result, the running of the tape 5 is stopped, and the rotation of the rotating drum is also stopped, and the same FWj K, L/bar
Due to the displacement 7, the pinch roller 3 is very slightly displaced from the crimping position shown by the solid line to the unloading position shown by the broken line, and reaches the position (3) shown by the dashed-dotted line, where it is separated from the capstan 4.

In this case, since the drive mechanism of the balls 2a to 2e is linked to the lever 7, the balls 2a to 2ta are very slightly displaced from the loading position shown by the solid line to the unloading position shown by the broken line, and are The indicated position (2a-2
e).

Due to the very slight separation of the pinch roller 3 from the capstan 4, no pressure is applied to the pinch roller 3, and as a result, even if this state continues for a long time, the pinch roller 3 may be plastically deformed. disappears. On the other hand, balls 2a to 2e
Due to a very slight displacement of the tape 5, the tape 5 is no longer stretched around the rotating drum 6 with strong tension, and comes into contact with the rotating drum 6 with a very small amount of slack. Therefore, even if the power is turned on again in this state and the rotating drum 6 starts rotating, the tape 5
is not rubbed too hard by a video head (not shown), eliminating the risk of tape wear.

By the way, when the recording lock switch is turned on and the power switch is turned off in the recording mode as described above, the pinch roller 3 may be displaced to the unloading position shown by the broken line, which may cause the balls 2a to 2e to
The video head is also displaced to the unloading position shown by the broken line, and the position of the video head relative to the tape 5 when the power is turned off does not match the position of the video head relative to the tape 5 when the video head is put into the loading state again, resulting in continuous shooting. It will not be possible to implement it accurately. Therefore, in order to prevent this, it is necessary that the amount of displacement of the pinch roller 3 from the capstan 4 is extremely small from the position where it is pressed against the capstan 4.

As described above, the magnetic recording and reproducing apparatus according to the present invention links the displacement operation of the loading ball with the pressing operation of the pinch roller to the capstan and the operation of separating it from the capstan, thereby stopping the running of the magnetic tape. When in the mode where the magnetic tape is held in the loaded state, a mechanism is provided that moves the pinch roller slightly away from the position where it is pressed against the capstan, so that in the above mode, the tape is stretched over the rolling drum with strong tension. The video head contacts the rotating drum with very little slack, so that when the rotating drum is rotated again, the tape will not be strongly rubbed by the video head, and there is no risk of tape wear. Since no pressure is applied to the pinch roller,
Even if this mode continues for a long time, the pinch roller has features such as there is no risk of plastic deformation.

[Brief explanation of the drawing]

The figure shows a plan view of one embodiment of the device of the invention. 2a-2e, 2a'-2θ1...Loading ball, 3j31...Pinch roller, 4...Capstan, 5...Magnetic tape, 6...Rotating drum, 7...Lever.

Claims (1)

[Claims] The displacement operation of the loading ball is linked with the operation of pressing the pinch roller against the capstan and the operation of separating it from the capstan, thereby stopping the running of the magnetic tape and maintaining the magnetic tape in the loading state. Time,
A magnetic recording/reproducing device comprising a mechanism for slightly separating the pinch roller from a position where the pinch roller is pressed onto the capstan.