JPH0555944B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a tape tension control device for stably running a magnetic tape in a magnetic recording/reproducing device.

[Conventional technology]

FIG. 2 is a plan view of essential parts showing an example of the configuration of a tape running system and a tape tension control device of a conventional cassette type magnetic recording/reproducing apparatus. In the figure, 1 is a tape supply side reel stand, 2 is a rotating shaft of the tape supply side reel stand 1, and 3 is a tension lever that has a tension pin 4 planted at one end and is rotatably attached to a rotating shaft 5. be. Further, a felt 7 is attached to a tension band 6 made of a phosphor bronze plate, and band holders 8, 1 are attached to both ends of the tension band 6.
0 is connected. A pin 9 planted on the other end of the tension lever 3 is rotatably attached to the band holder 8, and the band holder 10
is pin 1 planted on the deck base (not shown)
The felt 7 is rotatably attached to the reel base 1 and is configured so that the felt 7 winds the reel base 1. Further, the spring 12 is applied with a predetermined tension between a part of the tension lever 3 and the spring holder 13. 15 is a tape winding side reel stand, and 16 is a rotating shaft of the tape winding side reel stand. 17 is a tape supply side reel, 18 is a tape winding side reel,
The supply reel 17 and take-up reel 18 are loaded in a cassette 19 in parallel therewith. 20
is a tape, 21 is a tape guide drum (hereinafter simply referred to as a drum), and the drum 21 is connected to a rotating shaft 2.
It has a rotating upper drum and a fixed lower drum on the axis 1d, and a rotating magnetic head 21c provided facing the gap between both drums, and the lower end of the tape 20 is placed along a lead provided on the fixed lower drum. The tape 20 is helically guided on the circumferential surface of the drum 21 to record and reproduce signals. Reference numeral 22 denotes a pinch roller, which is rotated by a lever (not shown) in elastic contact with the circumferential surface of the capstan 23, and the tape 20 is held between the pinch roller 22 and the capstan 23 and transferred at a predetermined speed. . 24 is a control head, and 25 is an erase head. 26 and 27 are tape guide pins that regulate the tangent angle of the tape 20 to the lead of the drum 21;
8, 29, 30, and 40 are tape guide rollers. Impedance rollers 31 and 32 suppress vertical vibration of the tape 20.

Next, the operation will be explained.

The cassette 19 is installed as shown in the dashed line in FIG. set in place. Then, the tension pin 4 is set at a predetermined position, thereby applying tension to the tape 20, and the pinch roller 22 and the capstan 23 pinching the tape 20, so that the tape is rolled as shown in FIG. This is the state at the time of completion of the decoding. Then, the tape 20 is wound helically on the peripheral surface of the drum 21 along the lead of the fixed lower drum, thereby recording and reproducing signals. At this time, the braking force by the tape tension and tension band 6 and the spring 1 are applied around the shaft 5.
The tensile force due to 2 balances the moment.

[Problem that the invention seeks to solve]

Since the conventional tape tension control device is configured as described above, when the tension band 6 is loosened, the band expands due to the band's rigidity, and the balance of forces of the tape tension control device is not satisfied and the tape tension value is lowered. There was a problem in that this greatly increased the number of signals, making it difficult to record and reproduce stable signals.

This invention was made to solve the above-mentioned problems, and when controlling the tape tension, it is possible to prevent the movement of the tension lever from being absorbed by the deformation due to the rigidity of the tension band. It is an object of the present invention to provide a tape tension control device that can thereby improve stability in tape tension control and perform better signal recording and reproduction.

[Means for solving problems]

The tape tension control device for a magnetic recording and reproducing device according to the present invention includes a spread regulating member that regulates the spread by its rigidity when the tension band is relaxed.
It is provided at a position where it is always in sliding contact with one end of the tension band or with a band holder attached to the one end.

[Effect]

In this invention, the expansion regulating member that restricts the expansion of the tension band due to its rigidity when it is relaxed is provided at a position where it is always in sliding contact with one end of the tension band or with a band holder attached to the one end. , when the tension lever moves in the direction of loosening the tension band, the part of the tension change in the tension band that is spent on deformation due to the rigidity of the tension band is reduced, and the magnetic tape detected by the tension pin is reduced. Tension changes are efficiently fed back to the tension of the tension band. As a result, the reel stand can be appropriately braked during tape tension control, and the tension control performance of the magnetic tape can be improved.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the main parts of a tape tension control device according to an embodiment of the present invention. In the figure, 1 is a tape supply side reel stand, 2 is a rotating shaft of the tape supply side reel stand, and 3 is a rotating shaft of the tape supply side reel stand. This is a tension lever with a tension pin 4 mounted on it and a rotary shaft 5 which is freely rotatable. Further, a felt 7 is attached to the tension band 6, and band holders 8 and 10 are connected to both ends of the band 6.
The band holder 8 is rotatably attached to a pin 9 set on the other end of the tension lever 3, and the band holder 10 is rotatably attached to a pin 11 set on a deck base (not shown). The felt 7 is attached to the band 6 and the felt 7 is attached to the reel stand 1.
It is configured to wind. Also, spring 1
2 is a part of tension lever 3 and spring holder 1
A predetermined tension is applied between the two. Reference numeral 14 denotes an expansion regulating member which is placed in a position where it is always in sliding contact with the band holder 8 attached to one end of the tension band 6, and which restricts the expansion due to its rigidity when the tension band 6 is relaxed. (not shown), and is disposed so that one end abuts the band holder 8.

Next, we will discuss the effects.

In the tape tension control device configured as described above, the pin 4 moves in the direction indicated by the arrow A due to an increase in tape tension.
When the tension lever 3 is moved in the direction of
rotates around the rotating shaft 5, and the pin 9 installed at one end of the tension lever 3 moves in the direction of arrow B. At this time, the band holder 8 rotatably engaged with the pin 9 also moves, and the tension band 6
Band holder 8 is subjected to a force in the direction of arrow C due to its rigidity, but the expansion regulating member 14 prevents band holder 8 from rotating in the direction of arrow C due to the above force, and The band can be loosened efficiently, tension control can be followed accurately, and signals can be recorded and reproduced better.

In addition, in the above embodiment, the spread regulating member 14
Although it is configured to abut on the band holder 8 attached to the tension band 6, it may be configured so that it directly abuts on the end of the tension band 6 on the tension lever side.

〔Effect of the invention〕

As described above, according to the tape tension control device of the present invention, the expansion regulating member that restricts the expansion due to the rigidity of the tension band when the tension band is relaxed is attached to or attached to one end side of the tension band. Since the tension lever is provided in a position where it is always in sliding contact with the tension band holder, when the tension lever moves in the direction of loosening the tension lever, the tension change in the tension band is spent on deformation due to the rigidity of the tension band. The change in tension of the magnetic tape detected by the tension pin is efficiently fed back to the tension of the tension band. This allows the reel stand to be controlled appropriately in tape tension control, and the magnetic This has the effect of improving the tension control performance of the tape.

[Brief explanation of drawings]

FIG. 1 is a plan view of a main part showing a tape tension control device according to an embodiment of the present invention, and FIG. 2 is a main part showing an example of the configuration of a tape running system and a tape tension control device of a conventional cassette type magnetic recording/reproducing device. FIG. In the figure, 1 is the tape supply side reel stand, 2 is the rotating shaft of the reel stand 1, 3 is the tension lever, and 4 is the rotation axis of the reel stand 1.
is the tension pin, 6 is the tension band, 14
is an expansion regulating member. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] 1. A reel stand that rotates integrally with the tape supply reel of a magnetic recording and reproducing device, and a tape tension lever that detects the tension of the magnetic tape running at a predetermined position within the magnetic recording and reproducing device. and a tension band having one end engaged with the tension lever and applying braking to the reel stand in accordance with the movement of the lever, and controlling the tension of the magnetic tape when it runs. In this method, an expansion regulating member that restricts the expansion of the tension band due to its rigidity when the tension band is relaxed is arranged at a position where it is always in sliding contact with one end of the tension band or with a band holder attached to the one end of the tension band. A tape tension control device characterized by: