JPH044679B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a detection device for detecting displacement of a reinforcing ring attached to an elastic rotary disk such as a floppy disk for an information recording/reproducing device or a sonosheet for a record player.

Conventionally, this type of rotary disk, for example, FIGS.
For floppy disks like the one shown in the figure,
A center hole 2 into which the drive shaft fits is provided at the center of the rotary disk 1, and a reinforcing ring 3 is attached coaxially around the center hole 2 to prevent the center hole 2 from being closed by the frictional torque transmitted from the drive shaft. Some have a structure that prevents damage to the edge 2a.

Attaching such a reinforcing ring to the rotary disk is important to protect the edge of the center hole of the rotary disk, but on the other hand, a high degree of accuracy is required for the attachment position.For example, when the hole diameter R ₁ is 28.575 mm, On the floppy disk,
A reinforcing ring with an inner diameter R ₂ of 28.75 mm is used,
When attaching this reinforcing ring along the opening periphery of the center hole of the floppy disk, it is necessary to adhere it with an accuracy of usually 1/100 to 2/100 mm so that it does not protrude from the center hole. ,Measurement using conventional optical sensors can only detect deviations in the adhesion position to an accuracy of at least 3/100 mm, so accurate recording and playback cannot be achieved by eccentric rotation of the rotary disk due to deviation in the adhesion position of the reinforcing ring. This has become impossible, leading to quality defects.

This invention was made under the above circumstances, and its purpose is to utilize the elasticity and dead weight of the rotating disk to strengthen the reinforcing ring attached around the center hole of the rotating disk. An object of the present invention is to provide a detection device capable of detecting positional deviation within a predetermined accuracy range.

In order to achieve the above-mentioned object, this invention positions a rotary disk having a reinforcing ring attached around the center hole on a pedestal, and the center of the rotary disk is positioned above the pedestal so as to be able to rise and fall freely. A detection body having an outer diameter that is extremely slightly smaller than the hole diameter of the hole is lowered toward the center hole of the rotary disk, inserted, and then raised, while a sensor is provided near the pedestal to detect the vertical state of the rotary disk. It is characterized by:

Hereinafter, the present invention will be explained in detail with reference to an illustrated embodiment.

As shown in FIG. 3, reference numeral 10 in the figure is a device for attaching the reinforcing ring 3 to the rotary disk 1, and the rotary disk 1 moving on the conveyor line 11 is fixed onto the first pedestal cylinder 13 using the first stopper 12. The first pedestal cylinder 13 is raised and inserted into the center hole 2 of the rotary disk 1 for positioning, and then the first pedestal cylinder 13 is moved upwardly and downwardly oppositely located above the first pedestal cylinder 13. The attachment cylinder 14 is lowered, and the reinforcing ring 3 held by the first attachment cylinder 14 is placed on the rotary plate 1 positioned by the first pedestal cylinder 13.
It has a structure in which it is pasted around the center hole 2 of. By this pasting device 10, the reinforcing ring 3
When the first stopper 12 is opened, the rotary disk 1 with the reinforcing ring 3 attached is transported to the reinforcing ring adhesion detection device 15 side, and is stopped against the second stopper 16, and the pressure sensor 17 detects the presence or absence of the reinforcing ring 3. After detecting this, the second stopper 16 is opened and the reinforcing ring attachment position detection device 18, which will be described later, is transported.

The reinforcing ring adhesion position detection device 18 is a fourth
As shown in Figures 1 and 5, there is a third stopper 19 that abuts and stops the rotary disk 1 to which the reinforcing ring 3 is attached, and a third stopper 19 that is inserted into the center hole 2 of the rotary disk 1 stopped by this stopper 19 and positioned. a second pedestal cylinder 20 , a detection body 21 inserted into the center hole 2 of the rotary disk 1 which is positioned opposite to and positioned above the second pedestal cylinder 20 ; It consists of a reflective sensor 22 that is set nearby and detects the vertical state of the rotary disk 1 which is lifted by the upward movement of the detecting body 21, and the detecting body 21 is configured to detect the diameter of the center hole 2 of the rotary disk 1. The outer diameter R ₃ (for example, 28.500 mm) is set to be extremely slightly smaller than R ₁ (for example, 28.575 mm).

That is, the detection body 21 is lowered and inserted toward the center hole 2 of the rotary disk 1, which is positioned by a pedestal cylinder 20 with a diameter of 28.450 mm, which is smaller than the diameter of the rotation center hole of the floppy disk, and then raised. When the rotary plate 1 is lifted, the reflective sensor 2 detects whether the rotary plate 1 does not lift up, or even if it lifts up, it immediately falls down due to its own weight (approximately 3 mm).
This is done by detecting the misalignment of the reinforcing ring 3 on the rotary disk 1 by making the determination in step 2. If the rotary disk 1 remains lifted up, it is identified as a defective product. Therefore, 1/10
This enables measurement with an accuracy of 0 to 2/100 mm.

As explained above, the present invention provides a reinforcing ring attached to the center hole of the rotary disk around the center hole.
By inserting a detection body with an outer diameter that is extremely slightly smaller than the hole diameter of the center hole, and detecting the lifting state of the rotary disk by the upward movement of this detection body, the attachment position of the reinforcing ring to the rotary disk can be determined. Since it is possible to measure the deviation, it can be expected to be more accurate than conventional measuring means using optical sensors, and has excellent practical effects.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an example of a rotary disk to which a reinforcing ring is attached, Fig. 2 is an enlarged sectional view of the main parts,
FIG. 3 is an explanatory diagram showing an embodiment of the reinforcing ring adhesion position detection device according to the present invention, which is incorporated in the reinforcing ring adhesion process and adhesion detection process to the rotary disk;
The same figure is an enlarged explanatory view of the main part, and FIG. 5 is an explanatory view showing a detection state by inserting a sensing body. DESCRIPTION OF SYMBOLS 1... Rotating disk, 2... Center hole, 3... Reinforcement ring, 20... Pedestal cylinder, 21... Sensing object, 2
2... Reflective sensor, R ₁ ... Hole diameter of center hole, R ₃
...Outer diameter of the object to be detected.

Claims (1)

[Claims] 1. A rotary disk with a reinforcing ring pasted around the center hole is positioned on a pedestal, and an outer diameter that is extremely slightly smaller than the hole diameter of the center hole of the rotary disk is positioned above the pedestal so that it can be raised and lowered. A reinforcing ring for a rotary disk, characterized in that a sensor is provided in the vicinity of the pedestal to detect the vertical state of the rotary disk, while the detection body is lowered toward the center hole of the rotary disk, inserted, and then raised. Adhesive position detection device.