JPH01264653A - Tape tension controller - Google Patents

Abstract

PURPOSE:To change the set value of a tape tension by moving a fixed side hook position of the energizing spring fitted to an tension arm according to a using tape thickness. CONSTITUTION:When a cassette 11 is mounted, a detecting part 31 obtains respective kinds of information from the open and close of the hole. Based on the information, a control part 33 drives a motor 32, a gear 21 rotates a cam 20, and a pin 24 fitted in a cam groove is moved. According to it, a fixed side hook 18 is moved, and the energizing force of a spring 14 is changed. Thereafter, in the same way as conventional, for the position of a pin 9, the fact that a magnet piece 22 on a tension arm 12 is moved along with the swing of the arm 12 is detected as an electric signal by a Hall element 23. The signal is supplied to a reel motor 29, a rotation load to a reel 7 is adjusted, and the tape tension is controlled. By such a constitution, since a proper tension according to the tape thickness can be obtained, the signal can be stably recorded and reproduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a tape tension control system that uses a rotating head type magnetic recording and reproducing device that uses a cassette that stores a tape and a cassette that has various information such as the thickness of the tape. This relates to a control device.

[Conventional technology]

FIG. 5 is a plan view showing the outline of a rotating head type magnetic recording/reproducing device, in which (1) is a magnetic head, (2)
(3) is a cylinder unit consisting of a rotating cylinder equipped with a magnetic head (1) and a fixed cylinder having a tape running guide; (4) is a movable supply side tape guide for unloading and spirally winding around the cylinder unit (2); 5) is a capstan that rotates at a constant rotation speed, (
6) is a pinch roller for transmitting the rotational force of the capstan (5) to the magnetic tape, (7) is a supply reel that supplies the magnetic tape, (8) is a take-up reel that winds the magnetic tape, and (9) is a A tension pin detects the tape tension generated in the magnetic tape by its position, (10) is a guide ball that forms the running path of the magnetic tape, (11) is a cassette that stores the magnetic tape, (100) is a recording medium for magnetic signals. This is magnetic tape.

FIG. 6 is a perspective view showing a conventional tension control device for controlling tape tension, and in the figure (12) is a rotatable tension arm equipped with a tension pin (9);
(13) is the rotation fulcrum of the tension arm (12), (1
4) is a biasing bar 4 for biasing the tension arm (12) in one direction, (15) is a hook on the fixed side of the biasing spring (14), and (16) is a biasing bar with one end fixed and the other end tensioned. The tension band (17) fixed to the arm (12) and wound around the supply reel hub is placed coaxially with the supply IJ-7+/(force) and applies an appropriate load to the supply reel (7) during recording and playback. This is a supply reel hub for applying a constant tension to the magnetic tape (100).

Next, the operation will be explained. Supply side tape guide (3)
and take-up side tape guide (4) from I to the magnetic tape (
100) is pulled out from the cassette (11) and wound around the cylinder unit (2). Pinch roller at next 0 (6)
Insert the magnetic tape (100) and attach the capstan (5).
), the rotational force of the capstan (5) is transferred to the magnetic tape (100) via the pinch roller (6).
The magnetic tape (100) is transported at a constant speed. At this time, the magnetic head (1) attached to the rotating cylinder of the cylinder unit (2) causes the magnetic tape (1
A signal is recorded on the magnetic tape (00) or a signal recorded on the magnetic tape (100) is reproduced. Further, the magnetic tape (100) sent out by the capstan (5) and the pinch roller (6) is wound onto a take-up reel (8). During this recording and reproduction, the magnetic head (1) and the magnetic tape (100)
Tape tension is controlled to keep the contact state constant.

As shown in Fig. 6, the magnetic tee 7' (
100), this system is balanced by the tape tension and the spring force of the biasing spring (14).

If the tape tension decreases for some reason, this equilibrium point changes and the tension pin (9) moves toward the front. Then, the tension band (16) fixed to the tension arm (12) tightens and the supply side reel hub (
17), the load is increased to increase the tension on the magnetic tape (100).

Also, if the tape tension increases, the tension pin (9
) moves in the opposite direction to loosen the tension band (16), reducing the load on the supply reel knob (17) and reducing the tension on the magnetic tape (100). In this way the tape tension developed on the magnetic tape (ioo) is kept constant.

Conventional tape tension control devices are configured as described above, so there is only one type of tape tension setting, and when tapes with different thicknesses are used, differences in tape rigidity cause differences between the magnetic tape and the magnetic head. There are problems in that the contact state of the magnetic tape may change, making it impossible to record and reproduce stable signals, and when a thin tape is used, there is a risk of damaging the magnetic tape.

This invention was made to solve the above-mentioned problems, and it is possible to record and reproduce stable signals even when using tapes with different thicknesses, and to improve the tape tension to prevent damage to the tape. The purpose is to obtain a control device.

[Means to solve the problem]

The tape tension control device according to the present invention changes a set value to obtain an appropriate tape tension depending on the thickness of the tape used.

[For production]

The tape tension control device of this invention moves the position of the fixed side hook of the biasing device attached to the tension arm according to the difference in the thickness of the tape used, without changing the neutral position of the tension pin. This is used to change the tape tension setting.

[Embodiments of the invention]

An embodiment of the present invention will be described below with reference to FIG.
), (19) is the rotation fulcrum of the hook (18), (20) is a disc-shaped cam having a cam groove, (21) is a drive gear for rotating the disc-shaped cam (20), (2
2) is a magnet piece for detecting the position attached to the tension arm (12), and (23) is a piece of magnet for detecting the position of the tension arm (12) attached to the board (A) + converting changes in magnetic flux for detecting the position of the tension arm (12) to an electrical signal. (24) is a pin provided on the fixed side hook (18) for the rotatable biasing bi.
(29) is a supply reel (supply side IJ for applying rotational load to force) remoter.

In FIG. 2, (30) is a detection unit provided in the cassette (11) that provides various information such as tape thickness.

Referring to Figure 3, (31) is a detection unit that detects various information such as tape thickness, (32) is a motor that is a drive source for driving the disc-shaped cam (20), and (33) is a detection unit. Part (3
This is a control section that gives a signal to rotate the disk-shaped cam (20) to a position where a scraping force corresponding to the tape thickness can be obtained from the information obtained in step 1). In each figure, the same or corresponding parts as those of the conventional device are given the same reference numerals, and the explanation thereof will be omitted.

Next, the operation will be explained. Figure 2 is a perspective view from below of a cassette (11) containing various information such as tape thickness, and this cassette (11) can detect various information such as tape thickness by opening and closing the detection hole (30). . When this cassette (11) is loaded into the device, various information is detected by the information detection section (31). Based on that information, the cassette (11
) The appropriate tension of the magnetic tape (100) stored in the magnetic tape (100) can be detected. Based on this information, a current is applied from the control unit (33) to the motor (32), and the drive gear (21) rotates the disc-shaped cam (20) (this allows it to fit into the cam groove of the disc-shaped cam (20)). The fixed side hook (18) moves accordingly, and the biasing force of the biasing spring (14) changes.Hereafter, the tape tension is detected in the same way as before by using the tension pin (24). The position is detected by detecting the position of the tension arm (12).
) is detected by changing the magnetic flux to the Hall element (23) and extracting it as an electric signal. The rotational load on the supply reel (force) is adjusted from the signal by the supply side reel motor (29) f, thereby controlling the tape tension.

In the above embodiment, a disk-shaped cam (20) was used as a moving means for the fixed side hook (18) of the biasing bar 4 (14), but as shown in FIG. 25
) may be used.

Further, in the above embodiment, a method using a magnet piece (22) and a Hall element (23) was shown as a method for detecting the position of the tension pin (9), but as shown in FIG.
7) and a light receiving element (28), and the tension arm (
The light-receiving element (28) is
The position may also be detected by changing the amount of light irradiated.

〔Effect of the invention〕

As described above, according to the present invention, since the biasing force to the tension arm is configured to be variable, an appropriate tape tension can be obtained without changing the neutral position of the tension pin according to the thickness of the magnetic tape. In addition to being able to record and reproduce stable signals, since the neutral position of the tension pin does not change, the tension pin position detection section can be used in common regardless of the tape thickness.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a tape tension control device of a rotary head type magnetic recording/reproducing apparatus according to an embodiment of the present invention, FIG. 3 is a block diagram showing the configuration of the above embodiment, FIG. 4 is a perspective view showing a tape tension control device showing another embodiment of the present invention, and FIG. 5 is a schematic diagram of a rotary head type magnetic recording/reproducing device. The plan view and FIG. 6 are perspective views showing a conventional tape tension control device. In the figure, (7) is a supply reel, (9) is a tension pin, (12) is a tension arm, (14) is a biasing spring, (18) is a rotatable fixed side hook, and (20) is a disc shape. Cam, (21) is drive gear, (22) is magnet piece, (
23) is a pole element, (24) is a pin, (29) is a supply side reel motor, (31) is a detection unit, and (100) is a magnetic tape. Note that the same reference numerals in each figure indicate the same or similar parts.

Claims (1)

[Claims] (1) A rotary head type in which a rotary head divides and records signals diagonally on a tape-shaped recording medium, reproduces the signals, and uses a cassette that stores the tape-shaped recording medium and has various information such as tape thickness. A pin-like member is pressed by a spring against the tape-shaped recording medium pulled out from the cassette of the magnetic recording/reproducing device, and the tape tension is detected by the balance between the tape tension acting on the tape-shaped recording medium and the spring force, and the tape tension is controlled. A tape tension control device comprising: a rotatable member having a hook portion and a pin portion for fixing one of the springs; a cam member having a cam groove portion that fits with the pin portion; and a rotatable member having a cam groove portion that engages with the pin portion; a drive member that presses the tape-shaped recording medium; a position detection device for the pin-shaped member that presses the tape-shaped recording medium;
and a tape tension control device comprising a load applying device that applies a rotational load to the supply reel in the cassette.