JPS6292255A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain the titled device coping with recording quick rewinding modes by providing a drive means moved while being in contact with a moving member while the mode of recording/reproduction is switched into the quick rewinding reproduction mode, where a band black wound around a supply reel turntable drives the tension arm in a direction not braking the supply reel turntable in the quick rewinding reproduction mode. CONSTITUTION:A tension arm drive lever 2 is energized by a spring 8 in the recording/reproducing modes and the 2nd contact part 2b and an end face 5 are not brought into contact with each other. Thus, a band brake 11 fitted to the arm 3 gives a change to a band framing force to the supply reel turntable 10 depending on the displacement of the tension arm 3 driven and displayed in response to the tension of a magnetic tape 13 to control the tension of the magnetic tape 13 in a constant level. In the transition to the quick rewinding reproduction mode, the moving member 1 is moved to the left up to the 2nd position, the 1st contact part 2a and a projection 1a and brought into contact with each other, and while the 1st contact part 2a overrides the projection 1a, the lever 2 is turned clockwise.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a magnetic recording/reproducing device.

Conventional technology As a conventional technology, for example, Japanese Patent Publication No. 58-15015
There is a magnetic recording/reproducing device as shown in Publication No. 7. The above-described conventional magnetic recording/reproducing device will be described below with reference to the drawings.

Fig. 5 is a diagram showing the operation of the main parts corresponding to the recording or reproducing mode of a conventional magnetic recording/reproducing device, and Fig. 6 is a fast reversal playback B? 1 is a main part operation diagram corresponding to FIG. In Figures 5 and 6,
A tension arm 17 having a pivot shaft 20 is biased counterclockwise by a tension spring 21 and
and an end surface 19. The tape guide 26 guides the magnetic tape 28. The cam 22 with 25 as a pivot shaft has a first cam surface 23a, a second cam surface 23b, and a third cam surface 2.
3C and a groove 24.

The operation of the conventional magnetic recording/reproducing apparatus configured as described above will be described below. In the recording or reproduction mode, the tension arm 17 and the cam 22 are the fifth
In the state shown in the figure, the tension arm 17 is rotated and displaced according to the tension of the magnetic tape 28, and the amount of displacement of the tension arm 17 is made to correspond to changes in the band braking force of a supply reel stand (not shown). , the tension of the magnetic tape 28 is controlled to be constant. When the recording or reproduction mode B changes to the fast reversing reproduction mode, the cam 22 rotates to the state shown in FIG. 3rd cam surface 2
3C, the tension arm 17 is rotated clockwise to release the band braking force on the supply reel stand (not shown), and
is configured to be able to freely rotate in the direction in which the magnetic tape 28 is wound.

Problems to be Solved by the Invention However, with the above configuration, different rotational positions of the cam are required for the recording or playback mode and the fast reversal playback mode, and the same rotational position of the cam requires different rotational positions for both front and rear playback modes. The problem was that it was not possible to respond to

In view of the above-mentioned problems, the present invention provides a magnetic recording/reproducing device that controls the rotation of a tension arm so that the same position of the member that rotates the tension arm can be used for recording or playback mode and fast reversal playback mode. It is something.

Means for Solving the Problems In order to solve the above-mentioned problems, the magnetic recording/reproducing device of the present invention changes the recording or reproducing mode when switching the operating mode of the device from the recording or reproducing mode to the fast reversing mode B. a moving member that moves from a first position corresponding to the first position to a second position corresponding to a transition section in which the recording or reproducing mode switches to a fast reversing reproducing mode, and then again to the first position in the fast reversing reproducing mode; Or, in Reproduction B, a tension arm with a band brake that wraps around the supply reel stand and brakes the supply reel stand comes into contact with a moving member and moves while switching from the recording or playback mode to the fast reversal playback mode. In addition, in the fast reversal mode, the tension arm drive means is provided for rotating the tension arm in a direction in which the band brake wrapped around the supply reel base does not brake the rotation of the supply reel base.

The zero-flash action is achieved by the above-described configuration, and the tension arm position, where the band brake brakes the rotation of the supply reel base according to the tension of the magnetic tape, corresponds to the recording or playback mode, and the band brake corresponds to the fast reversal playback mode. the tension arm position where the brake does not brake the rotation of the supply reel stand;
This can be realized by keeping the movable members in the same position.

Embodiment Below, a magnetic recording and reproducing apparatus according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is an operational diagram of the main parts of a magnetic recording/reproducing apparatus according to an embodiment of the present invention corresponding to the recording or reproducing mode, and FIG. FIG. 3 is a diagram showing the operation of the main parts corresponding to the fast reversal mode, and FIG. 4 is a schematic sectional view of the operation system.

1 to 4, 14 is a chassis, and the tape guide 12 is fixed to the chassis 14 and guides the magnetic tape 13 pulled out from a cassette (not shown). The shafts 6 and 7 are installed in the chassis 14, and the tension arm drive lever 2 and the tension arm 3 use the shafts 6 and 7 as pivot axes, respectively. When switching from recording or playback H to fast rewind playback mode, the chassis 14
A moving member 1 that moves horizontally above has a convex portion 1a. At this time, the convex portion 1a comes into contact with the first contact portion 2a, and the tension arm drive lever 2, which is biased in the opposite direction to the rotation direction by the tension arm drive lever biasing spring 8, is centered around the shaft 6. Rotate it counterclockwise. The tension arm 3, which is urged counterclockwise around the shaft 7 by the tension arm tension spring 9 and has the pin 4, rotates clockwise when the second contact portion 2b and the end surface 5 come into contact with each other. to release the band brake force of the band brake 11 on the reel stand IO.

The operation of the magnetic recording/reproducing apparatus configured as described above will be described below with reference to FIGS. 1 to 4.

First, in FIG. 1, the movable member 1 is in a first position corresponding to recording or reproduction B. At this time, the tension arm drive lever 2 is activated by the tension arm drive lever biasing spring 8.
, and is in a position where the second contact portion 2b and the end surface 5 do not contact each other. As a result, the tension arm 3 is in the state shown in FIG. By changing the band braking force applied to the stand 10, the tension of the magnetic tape 13 is controlled to be constant.

Next, in FIG. 2, the movable member 1, which was in the first position indicated by the broken line corresponding to the recording or reproduction mode, is moved to the first position indicated by the solid line in the transition section where the recording or reproduction mode is switched to the fast-return reproduction mode. It is moved to the left by a drive source (not shown) to the second position.

At this time, the first contact portion 2a and the convex portion 1a are in contact with each other, and
The tension arm drive lever 2 rotates clockwise while the first contact portion 2a rides over the convex portion 1a, but due to the biasing force of the tension arm drive lever biasing spring 9, the recording or reproduction Li shown in FIG. The second contact portion 2b corresponding to
and end face 5 return to a position where they do not come into contact with each other. In this transition section, the second contact portion 2b and the end surface 5 do not come into contact with each other, so that the band brake 11 changes the band brake force applied to the supply reel stand 10 according to the tension of the magnetic tape 13. The tension of the magnetic tape 13 is controlled to be constant.

Next, in FIG. 3, the movable member 1 is driven from a second position indicated by a broken line corresponding to a transition section where the recording or reproduction mode switches to a fast-return reproduction mode to a position indicated by a solid line corresponding to the fast-return reproduction mode. movement to the right by a source (not shown). However, the position indicated by this solid line corresponds to the first position corresponding to the recording or reproduction mode shown in FIG. Here, while the moving member 1 moves from the second position to the first position, the convex portion 1a and the first abutting portion 2a abut, and the tensigon arm driving means 2 rotates counterclockwise. , the second contact portion 2b and the end surface 5 come into contact with each other, and the tension arm 3
is rotated clockwise to loosen the winding of the band brake 11 around the supply reel stand IO. As a result, in the fast reversal mode, the band braking force of the supply reel stand 10 is released, and the supply reel stand 10 can freely rotate in the direction in which the magnetic tape 13 is wound.

Effects of the Invention As described above, the present invention has the following advantages:
A tension arm having a band brake that wraps around the supply reel stand and brakes the supply reel stand, and a tension arm that moves from the first position to the second position when switching the operating mode of the device from the recording or playback mode to the fast-return playback mode. A moving member that moves to the first position again, and a band that moves in contact with the moving member during switching from the recording or playback mode to the fast-return playback mode, and that wraps around the supply reel stand in the fast-return playback mode. By providing a tension arm driving means that contacts the tension arm so as to rotate the tension arm in a direction in which the brake does not brake the rotation of the supply reel base, recording or playback can be performed at the same position of the moving member with an extremely simple configuration. The tension arm can be controlled to a position that corresponds to the mode and fast rewind playback L3t'4t=. Furthermore, since the moving member stops only at the first position,
The position detection means and positioning means of the moving member have a simple structure.

[Brief explanation of drawings]

FIG. 1 is an operational diagram of the main parts of a magnetic recording/reproducing apparatus according to an embodiment of the present invention corresponding to the recording or reproducing mode, and FIG. 2 corresponds to the transition section when switching from the recording or reproducing mode to the fast reversing mode. Figure 3 is a diagram of the operation of the main parts corresponding to the fast reversal mode, Figure 4 is a sectional view of the main parts of the operating system, and Figure 5 is a diagram of the operation of the main parts corresponding to the fast reversal mode. FIG. 6 is a diagram showing the operation of the main parts corresponding to the reproduction mode B. FIG. DESCRIPTION OF SYMBOLS 1...Moving member, 2...Tension arm drive lever, 2a...First contact portion, 2b.
...Second contact portion, 3...Tension arm, 5...End face, 9...Tensiran arm drive lever biasing spring, 10... ...Supply reel stand, 11...Band brake, 13...
·Magnetic tape. Name of agent: Patent attorney Toshio Nakao (1 person) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] When switching the operation mode of the device from a recording or reproducing mode to a fast reversing reproducing mode, from a first position corresponding to the recording or reproducing mode to a transition section where the recording or reproducing mode is switched to the fast reversing reproducing mode. a moving member that moves to the first position again in the fast-return playback mode after passing through a corresponding second position; and a band that wraps around the supply reel stand and brakes the supply reel stand in the recording or playback mode. a tension arm having a brake; the tension arm moving in contact with the movable member during switching from the recording or reproducing mode to the fast reversing mode; and in the fast reversing mode, the tension arm is wound around the supply reel stand; A magnetic recording and reproducing apparatus comprising: tension arm driving means for rotating the tension arm in a direction in which a band brake does not brake the rotation of the supply reel stand.