JPH0543346U - PG coil position adjustment mechanism - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to develop a position adjusting mechanism capable of accurately and easily adjusting the position of a PG coil included in a magnetic sheet recording / reproducing apparatus. [Structure] The position of the PG coil is adjusted at a predetermined angle with respect to the radial direction of the magnetic sheet, and the PG coil is adjusted to the magnetic sheet.
Position adjustment along the rotation direction of the
Fine adjustment can be easily performed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a PG coil position adjusting mechanism provided in a recording / reproducing apparatus for recording on a magnetic sheet such as a video floppy disk and reproducing the recording.

[0002]

[Prior Art]

 FIG. 5 is a schematic partial sectional view of a magnetic sheet recording / reproducing apparatus using a 2-inch video floppy disk as a recording medium. As shown, the center core 2 of the floppy disc 1 is fitted into the guide portion 3b of the turntable 3a provided on the spindle motor 3 so that the yoke plate 4 of the floppy disc 1 is moved. It is sucked by the magnet 5, and the floppy disk 1 is chucked by the turntable 3a. The floppy disk 1 is rotatably provided in the disk case 1a. The rising portion of the yoke plate 4 is exposed on the surface of the center core 2 and serves as a magnetic portion 4a for detecting the rotation of the floppy disk 1.

The PG coil (pulse generator) 6 is a rod 8 with a male screw inserted into the coil 8 wound around the bobbin 7 and a female screw provided in the cylindrical portion of the bobbin 7 so as to be screwed. It is composed of an iron core 9 and is fixed to a support plate 10 attached to a device fixing plate 11 by a screw 12 so that the tip of the iron core 9 faces a part of the swivel region of the magnetic part 4a. ing.

The PG coil 6 detects the magnetism of the magnet 5 guided by the magnetic portion 4 a for each rotation of the floppy disk 1, and outputs one pulse as an electric signal each time the floppy disk 1 makes one rotation. To do. That is, the phase control of the information recorded on the floppy disk 1 according to the output pulse of the PG coil 6 and the reproduction information of the recording is performed.

The above-mentioned PG coil 6 can adjust the screwing amount of the iron core 9 to adjust the distance (PG gap) between the tip of the iron core 9 and the magnetic portion 4a to obtain a stable output pulse. it can.

Further, the position of the PG coil 6 can be adjusted by sliding the support plate 10. That is, as shown in FIG. 6, the device fixing plate 11 is formed with the adjusting long hole 13 which is made to be orthogonal to the radial direction of the floppy disk 1, and by loosening the screw 12, this length is adjusted. The position of the PG carp 6 can be adjusted by sliding the support plate 10 within the range of the hole 13. The screw holes of the support plate 10 are round holes, and the support plate 10 is fixed by tightening the screws 12 after the adjustment.

Due to such position adjustment of the PG coil 6, the distance A between the magnetic head 14 and the iron core 9 shown in FIG. 7 changes, and the timing of the output pulse of the PG coil 6 is determined. .. In this figure, B indicates the position adjustment direction of the PG coil 6, and C indicates the rotation direction of the floppy disk 1.

[0008]

[Problems to be solved by the device]

 In the case of the above-mentioned conventional example, since the position adjustment of the PG coil 6 is performed along the arrow B direction shown in FIG. 7, it is very difficult to adjust the position of the PG coil 6 which requires delicate adjustment. It was That is, since the adjustment is made by sliding on an approximate straight line along the circumference of rotation of the floppy disk 1, the adjustment range is extremely narrow, and the adjustment requires skill and labor-intensive work. It was.

Therefore, an object of the present invention is to develop a PG coil adjusting mechanism which can widen the position adjusting range of the PG coil as much as possible, and can perform highly accurate adjustment and easy adjustment work. ..

[0010]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention provides, as a first invention, a PG coil which is provided in a magnetic sheet recording / reproducing apparatus, detects rotation of a magnetic sheet, and outputs a pulse for each rotation. A PG coil equipped with an adjusting means for sliding the PG coil support member attached to the apparatus fixing portion to adjust the position of the PG coil at a predetermined angle with respect to the radial direction of the magnetic sheet. We propose a position adjustment mechanism.

As a second invention, in a PG coil which is provided in a magnetic sheet recording / reproducing apparatus, detects rotation of the magnetic sheet and outputs a pulse for each rotation, a PG coil attached to a device fixing portion. There is proposed a position adjusting mechanism for a PG coil, which is provided with an adjusting means for sliding the supporting member of (1) and adjusting the position of the PG coil along the rotation direction of the magnetic sheet.

[0012]

[Action]

 In the adjusting mechanism of the first invention, the position of the PG coil is adjusted so as to be displaced along a predetermined angle with respect to the radial direction of the magnetic sheet, so that the adjusting range is considerably widened. Further, this adjusting mechanism is advantageous because it can be implemented by a simple means structure.

In the adjusting mechanism of the second invention, since the position of the PG coil is adjusted so as to be displaced along the rotation direction of the magnetic sheet, the adjusting mechanism has a sufficiently wide adjusting range, and fine adjustment is easy. Becomes

[0014]

【Example】

 Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a main part configuration diagram showing a first embodiment. In this embodiment, a tilted elongated hole 15 for adjustment is provided in a device fixing plate 11, and a support plate 10 is provided by a screw 12 passing through the tilted elongated hole 15. Is attached to the device fixing plate 11. Others have the same structure as the conventional example.

The inclined elongated hole 15 is formed at a predetermined angle θ with respect to the radial direction of the floppy disk 1, and is set to an angle of 45 ° in this embodiment. According to this embodiment, the screw 12 is loosened and the support plate 10 is slid in the range of the slender elongated hole 15 to adjust the position of the PG coil 6.

That is, since the PG coil 6 is displaced along the arrow D shown in FIG. 2 by such an adjustment, the adjustment range F becomes wider than the adjustment range E in the conventional adjustment direction, Fine adjustment becomes easy. After the adjustment, the screws 12 are tightened to fix the support plate 10.

FIG. 3 is a main part configuration diagram showing a second embodiment. In this embodiment, a support shaft 16 is provided at a device fixing plate portion (not shown) corresponding to the rotation of the floppy disk 1. A support plate 17 pivotally attached is provided, and the PG coil 6 is fixed to the support plate 17. Further, the support plate 17 is fixed at a predetermined turning position by a screw 12 which allows an arcuate hole 18 formed in the device fixing plate 11 to pass therethrough. A nut (not shown) screwed into the screw 12 is provided on the back side of the device fixing plate 11. Other configurations of this embodiment are the same as those of the conventional example.

In this embodiment, the screw 12 is loosened, and the support plate 17 is rotated about the support shaft 16 as a fulcrum to adjust the position of the PG coil 6. With this adjustment, the position of the PG coil 6 is displaced along the rotation direction of the floppy disk 1. That is, since the position of the PG coil 6 is adjusted so as to be displaced along the turning locus f 1 of the magnetic portion 4a, the adjustment range becomes extremely wide, and highly accurate fine adjustment can be easily performed. The arrow line G shown in FIG. 4 indicates the adjustment direction, and the arrow line H indicates the adjustment range.

Although the embodiment of the present invention has been described above, the adjusting means including the supporting plate 10, the screw 12, and the adjusting long hole 13, or the screw 12, the support shaft 16, the supporting plate 17, and the adjusting arc-shaped hole. The adjusting means consisting of 18 can be arbitrarily changed. For example, the elongated hole 15 for adjustment is formed in the support plate 10, and the arcuate hole 18 for adjustment is similarly formed in the support plate 17. Good. In this case, the screw holes of the device fixing plate 11 are round holes.

[0020]

[Effect of the device]

 As described above, according to the present invention, since the position adjustment range of the PG coil can be widened, fine adjustment with high precision is extremely easy, and the adjusting means has a simple structure, which is suitable for practical use. Position adjustment mechanism.

[Brief description of drawings]

FIG. 1 is a main part configuration diagram showing a first embodiment.

FIG. 2 is an operation explanatory diagram of the first embodiment.

FIG. 3 is a main part configuration diagram showing a second embodiment.

FIG. 4 is an operation explanatory diagram of the second embodiment.

FIG. 5 is a schematic partial sectional view of a magnetic sheet recording / reproducing apparatus shown as a conventional example.

FIG. 6 is a configuration diagram showing a conventional PG coil position adjusting mechanism.

FIG. 7 is a diagram for explaining a conventional PG coil position adjusting mechanism.

[Explanation of symbols]

 1 Floppy Disk 3 Spindle Motor 4 Yoke Plate 4a Magnetic Part 5 Magnet 6 PG Coil 9 Iron Core 10 Support Plate 11 Device Fixing Plate 12 Screw 15 Inclined Long Hole 16 Spindle 17 Support Plate 18 Arc-Shaped Hole

Claims (2)

[Scope of utility model registration request] 1. A PG which is provided in a magnetic sheet recording / reproducing apparatus, detects rotation of a magnetic sheet, and outputs a pulse for each rotation.
In the coil, a supporting member of the PG coil attached to the apparatus fixing portion is slid to adjust the position of the PG coil at a predetermined angle with respect to the radial direction of the magnetic sheet. Coil position adjustment mechanism. 2. A PG which is provided in a magnetic sheet recording / reproducing apparatus, detects rotation of the magnetic sheet, and outputs a pulse for each rotation.
Position adjustment of the PG coil, characterized in that the coil is provided with adjusting means for sliding the support member of the PG coil attached to the apparatus fixing portion to adjust the position of the PG coil along the rotation direction of the magnetic sheet. mechanism.