JPS61151862A - Rotary head type magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To apply the prescribed tension to a magnetic tape and to obtain the satisfactory still pictures by keeping a supply reel turntable in a stop state with operation of a still picture reproduction mode and at the same time changing the position of a tension pin to increase the tension of the tape. CONSTITUTION:In a still picture reproduction mode a slider 43 slides toward an arrow mark K. Then a boss 44 is separated and an arm 40 is turned clockwise by a tension spring 42. A tooth groove 2a formed along the outer circumference of a supply reel turntable 2 engages a projection bar 40a of the arm 40. Thus the disk 2 is fixed. The revolution of a capstan motor 26 is stopped while a magnetic tape 6 is pressed to a capstan 23 by a pinch roller 24. Then the take-up side of the tape 6 is fixed. The force of a tension spring 39 is increased with shift of the slider 43. Thus a tension arm 11 is turned clockwise and the tape 6 pressed to the pin 12 is held with the prescribed tension.

Description

Detailed Description of the Invention [Field of Application of the Invention] The present invention relates to a rotating head type magnetic recording/reproducing device (hereinafter referred to as V
(referred to as TR).

[Background of the invention]

The first servo mechanism for VTRs was developed in the 1970s.
8-. 69554 is known. The conventional structure will be explained with reference to FIGS. 2 and 3. FIG. 2 is a plan view of the l'TR main body, and FIG. 3 is an explanatory diagram of the tension servo mechanism shown in FIG. 2. In the figure, 1 is a cassette with a supply reel 3 that fits into a supply reel stand 2 of one main body and a winder Jim I of one main body.
It includes a take-up reel 5 that fits into the J-ru base 4 and a magnetic tape 6. Reference numerals 7 and 8 denote drawing members, and the drawing member 7° 8 and the drawing roller 9 move along predetermined moving paths -1, (B), and ρ) from the positions indicated by broken lines, respectively, and pull out the magnetic tape 6. It is designed to be pulled out from a position within the cassette 1 so as to form a predetermined traveling route. The pulled-out magnetic tape 6 is attached to a pin 10, a tension pin 12 set on the tension arm 11, a pull-out roller 9, an inclined pin 13, and so on. A rotating cylinder 18 containing a magnetic head passes through a full-width erasing head 14, an in-bee dunnne roller 15, an entrance guide roller 16, and an entrance inclined pin 17.
wrapped around. Subsequently, the magnetic tape 6 pulled out from the rotary cylinder 18 is moved by an output side inclined pin 19, an output side guide roller 20%, an audio erasing head 21, an audio head 22, a capstan 23, and so on. The pinch roller 24 forms a travel path passing through the guide pin 25.

The magnetic tape 6 is driven in the direction of the arrow (j) by a capstan 23 driven by a capstan motor 26 and a pinch roller 24 which pinches and presses the magnetic tape 6 between the capstan 23. Mode switching such as stopping is performed by transmitting the rotational driving force of the loading motor 27 to a mode switching gear (not shown), and mode detection is performed by a rotary type switch (not shown) that meshes with the mode switching gear. ing.

In the recording/reproducing mode, magnetic recording signals on the magnetic tape 6 are recorded or read 9 by a magnetic head built into the rotary cylinder 18, but the magnetic tape 6 can be brought into contact with the magnetic head with a predetermined tension 1. This is desirable from the viewpoint of jitter (sideways shaking of the image) and head touch. Therefore, there is a tension servo mechanism that stably adds a predetermined tension to the magnetic tape 6, which will be described below. In FIG. 2, a tension band 29 with felt 2B pasted on the inside is wrapped around the supply reel stand 2.
), both ends of the tension band 29 are rotatably attached to a boss 52g attached to the boss receiver 50.51 and a boss 116 installed on the tension run arm 11, respectively.

The member 52 is a pin 3 planted on a substrate 53 shown in FIG.
4, and its position is determined by a torsion spring 36 which is engaged via a screw 37 and a pin 35.

The tension arm 11 is as shown in Figure $5.

It is rotatably attached to a pin 38 set on a base plate 33, and is urged to rotate clockwise by a tension spring 39. When the tension of the magnetic tape 6 becomes low, the tensile force of the tension spring 39 causes the tension pin 12 to move in the direction of the arrow (F1).
direction and pulls the tension band 29 in the direction of the arrow (G1). When the tension band 29 is pulled, the felt 28 presses the outer peripheral surface of the supply reel stand 2, applying rotational load to the supply reel stand 2. By applying this force, a tension force is added to the magnetic tape 6 wound on the supply reel 3 that fits into the supply reel stand 2. Conversely, when the tension force of the magnetic tape 6 becomes high, the tension force increases. The pin 12 is a tension spring 39
The tension band 29. is pushed in the direction of the arrow p) against the tensile force of the tension band 29. ) arrow (pushing in the force direction) reduces the tape tension by relaxing the pressure of the felt 28 on the supply reel base 2.

VT with a tension-increasing servo mechanism with the above structure
For still image playback (hereinafter referred to as methyl) in R, the mechanical mode is the same as the recording and playback modes, and the rotation of the tt capstan motor 260, which presses the pinch roller 24 shown in FIG. 1 and the magnetic chip 16, is stopped. method. However, in this method, the magnetic tape 6 tends to become gradually slack in the running path, that is, the tape tension tends to decrease due to motor vibration, magnetic tape striking by the magnetic head, etc. The looseness with the tape 6 becomes defective. If the tape tension setting is high.

Even if the tension drops slightly, it will not cause a magnetic tape touch failure, but if the tape tension setting is low,
This will be greatly affected by the decline in strength. In that case, there was a problem in that the magnetic head could not read the signals magnetically recorded on the magnetic tape 6, leading to interruptions in the image quality.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned circumstances, and provides a rotating head type magnetic recording and reproducing device that can stably obtain good still images by adding a predetermined tape tension to the magnetic tape during still image reproduction mode. It is intended to provide m+.

[Summary of the invention]

In the rotary head type magnetic recording/reproducing device of the present invention, the supply reel of a cassette mounted on a supply reel table is pulled out and wound around a rotating cylinder via a tension pin, an entry side inclined pin, etc., which are set on a tension arm. a magnetic tape that is wound onto the take-up reel of the cassette via an exit side tilt pin, a capstan, and a pinch roller, and is clamped and fixed between the capstan and the pinch roller in a still image playback mode;
The magnetic tape is rotatably supported by a pin set on the substrate and rotated by the tension of a spring to adjust the tape tension of the magnetic tape to a predetermined value via the tension pin. means for holding the supply reel stand in a stopped state, which is formed to be linked to the operation of the still image playback mode, and a means for holding the supply reel stand in a stopped state; and means for positioning it at a position where the tension increases.

[Embodiments of the invention]

Hereinafter, an embodiment of a rotary head type magnetic recording/reproducing apparatus according to the present invention will be described with reference to FIG. 1, where the same parts as those of the conventional one are denoted by the same reference numerals, and the explanation of the structure of the same parts will be omitted.

FIG. 1 is a detailed view of the vicinity of the tension arm. In the figure, the supply reel stand 2 is indicated by the arrow (1) at the recording/playback mode.
) direction. The slider 43 has an arrow (
The position is regulated by the rotation angle of a mode switching gear (not shown) which is formed so as to be slidable in the direction shown in FIG. It has become. The arm 40 is rotatable around a pin 41 set on a base plate 35 shown in FIG. 2, and is urged to rotate clockwise by a tension spring 42. When the boss 44 comes into contact with the side wall of the slider 43, the position is determined such that the projection piece 40 does not engage with the engaging portion of the tooth groove 2G. The tension spring 39 has one end fixed to the slider 43 and the other end attached to the tension arm 11 at a position where the tension pin 12 rotates clockwise. The arm 401, slider 43, and tension arm 11 are in the positional relationship shown by broken lines in the recording and reproducing modes. Therefore, the slider 43 is in contact with the boss 44, and the projection piece 40g is disengaged from the tooth groove 211. □ When this changes to still mode, first
-45 slides in the direction of arrow (4)). Therefore, the boss 44 that was in contact with the side wall of the slider 43 separates from the slider 43, and the arm 4o rotates clockwise due to the tensile force of the tension spring 42 and is formed on the outer periphery of the supply IJ-rule base 2. The provided tooth groove 21B and the protruding piece 40G of the arm 40 engage with each other, and the supply reel stand 2 is fixed. In this case, the second
When the rotation of the capstan motor 26 of the capstan 23 is stopped while the magnetic tape 6 is in pressure contact with the capstan 23 by the pinch roller 24 shown in the figure, the magnetic tape is
The professional winding side is fixed. And slider 4
3 moved in the direction of arrow (A), the tension spring 39
The tensile force increases, and the tension arm 11 is rotated clockwise. The magnetic tape 6, which is pressed against a tension pin 12 mounted on a tension arm 11, changes with respect to the tape running path during recording and reproduction. Thereby, the magnetic tape 6 can be held with a certain predetermined tension. Incidentally, the tension tension can be slightly adjusted at this time by changing the tensile force of the tension spring 39.

The arm 40 is arranged around the outer periphery of the supply reel stand 2 and is configured to rotate around a pin 41 when the slider 43 contacts the boss 44 and by the tension of the tension spring 42. and a slider 43 formed to be slidable in the direction of arrow (A) or in the direction of arrow (A) constitute means for holding the supply reel stand 2f at the stop position. In addition, a tension spring 39 is attached to the slider 43.
The other end of the tension spring 29 is placed at the position of the tension arm 11 where the tension arm 11 can increase the tension of the magnetic tape 6 via the tension pin 12 when one end is fixed and the slider 4S is in the still image playback mode position. A mounting is formed to constitute a means for displacing the position of the tension pin 12.

As described above, the rotary heged type magnetic recording and reproducing apparatus of this embodiment has a means for holding the supply reel stand in a stopped state, which is formed so as to be linked with each operation in the still image reproduction mode, and a means for maintaining the position of the tension pin in the above-mentioned manner. Since a means for displacing the magnetic tape to a position where the tension increases is provided, it is possible to add a predetermined tension point to the magnetic tape 1 during still playback of a VTR, and to maintain the tension stably. This makes it possible to stably obtain good still images.

〔Effect of the invention〕

As described above, the rotary head type magnetic recording and reproducing apparatus of the present invention has the effect of adding a predetermined tape tension to the magnetic tape during the still image reproduction mode and stably obtaining good still images. be.

[Brief explanation of the drawing]

FIG. 1 is a detailed view of the same part as the opening in FIG. 2 of the embodiment of the rotary head type magnetic recording/reproducing device of the present invention, #! Figure 2 is a plan view of a conventional rotary head type magnetic recording/reproducing device, and Figure 3 is a plan view of a conventional rotary head type magnetic recording/reproducing device.
FIG. 3 is an explanatory diagram of the tension servo mechanism shown in the figure. 1... Cassette 2... Supply reel stand 2e
L...Tooth groove 3...Supply reel 5...
・Take-up loop 6...Magnetic tape 11...Tension arm 12...Tension pin 17...
Entrance side inclined pin 18...Rotating cylinder 19...
Exit side tilt pin 23...Capstan 24...
Pinch roller 33... Board 38.41,...
Pin 59.42...Tension spring 40...
Arm 40B...Protrusion piece 43...Slider-1 Figure 2

Claims (1)

[Scope of Claims] 1. A tension pin pulled out from a supply reel of a cassette mounted on a supply reel stand and planted on a tension arm, an outlet inclined pin wound around a rotating cylinder via an inlet inclined pin, etc.; The magnetic tape is wound onto the take-up reel of the cassette via a capstan, a pinch roller, etc., and in the still image playback mode, the magnetic tape is sandwiched and fixed between the capstan and the pinch roller, and is rotated around a pin planted on the board. and the tension arm is movably supported and rotated by the tension of a spring to adjust the tape tension of the magnetic tape to a predetermined value via the tension pin, the stationary Means for holding the supply reel stand in a stopped state, which is formed so as to be linked to the operation of the image reproduction mode, and means for displacing the position of the tension pin to a position where the tension of the magnetic tape is increased are provided. A rotating head type magnetic recording/reproducing device characterized by: 2. The means for holding the supply reel stand in a stopped state is rotatably supported on the outer circumference of the supply reel stand via a pin, and applies tension of a spring to a locking portion formed on the outer circumference of the supply reel stand. an arm having a protruding piece formed to be engaged when not in contact with the slider, and the other end of which is formed so that the slider can come into contact with the arm, and the protruding piece is engaged with the locking part in a playback mode state; and the slider is formed to be in contact with the arm so as to release the tension pin, and to be separated from the arm in the still image playback mode, and the means for displacing the position of the tension pin is configured such that the slider is in contact with the arm so as to release the spring. The other end of the spring is attached to a position of the tension arm where the tension arm can increase the tension of the magnetic tape via the tension pin when one end is fixed and the slider is in a still image playback mode position. A rotary head type magnetic recording and reproducing device according to claim 1, wherein the rotary head type magnetic recording and reproducing device is formed.