JPS6034138Y2 - leading guide pin - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a leading guide pin on a loading desk, and particularly to a leading guide pin that causes less damage to the tape.

In a two-head recital or can type VTR, it is necessary to load and unload the magnetic tape to or from a cylinder with a rotating head, and one of these methods is loading as shown in Figure 1. Some use disks.

A loading disk 1 is arranged at a predetermined angle with respect to a cassette 2 (only a part of which is shown) as shown in the opening of FIG.
, leading guide pin 5, etc. are supported.

Although the drive means for the disk 1 is omitted, the disk is rotated in the direction of arrow A in FIG. 1A during loading and in the direction of arrow B during unloading.

When installed in the cassette 2, as shown in the figure, the leading guide pin 5 and the pinch roller are inserted into the notch 2a at the bottom of the cassette.
4 enters.

Therefore, when the disk 1 rotates in the direction A, the tape 2b is pulled out from the take-up reel by the leading guide pin 5 and wound around the cylinder 6 (the erasing head, tension pin, etc. are not shown).

In this case, since the cassette 2 and the disk 1 are tilted as shown in the figure, the tape 2b is pulled diagonally upward.

Therefore, the upper end portion 5a of the leading guide pin 5 is formed with an inclined portion 5a' whose diameter increases upwardly, and the tape 2
It has the function of pushing down the tape when drawing out b.

The leading guide is made of resin, and its upper end 5a is fixed to a metal pin 7 driven into the disk 1, so that the tape sliding portion 5b can rotate around the pin 7.

However, with this shape of the leading guide pin, the tape is pulled out by the leading guide pin itself during loading, and the take-up reel of the cassette 2 can rotate relatively freely, so abnormal force may be applied to the tape. However, it is a problem when unloading.

This is because, as shown in FIG. 3A, near the end of unloading, the upper end of the tape 2b contacts the larger diameter portion of the inclined portion 5a, and the lower end contacts the small diameter sliding contact portion 5b, and the tape is not placed in the cassette. The supply reel is braked because it needs to be stored.
Further, since the take-up reel is driven in the take-up direction, a force is applied to the tape in the direction of the arrow in FIG. 3A.

For this reason, there was a risk that the tape would be damaged, such as the upper end of the tape being stretched.

The present invention has been made in view of the above points, and proposes a leading guide pin that causes less damage to the tape.

FIG. 2 is a front view, a top view, and a bottom view showing the shape of the upper end portion 8 of the leading guide pin in an embodiment of the present invention.

The upper end part 8 consists of a cylinder 8a and an inverted truncated cone (slanted part) 8b extending downward from the cylinder (therefore, the lower end has a small diameter and has the same diameter as the sliding part) (as indicated by the broken line in Fig. 2). (Including the supplemented part) It has a notched shape as shown in the figure.

In other words, in a certain angular range from the center (approximately 90° in the figure)
) It has no sloped portion at all and has the same diameter as the sliding contact portion 5b.

This upper end portion 8 is fixed onto the disk 1 in place of the upper end portion 5a in the conventional example so that the direction of arrow C in the opening in FIG. 2 is directed toward the tape contact side.

That is, it is fixed onto the cylinder so that the cutout portion without the inclined portion is on the tape contact side.

In the leading guide pin using this upper end portion 8, the tape is pushed down by the remaining inclined portion 8b during loading as in the conventional case.

Furthermore, during unloading, the tape and the leading guide pin come into contact as shown in the opening in Figure 3, that is, the portion of the upper end 8 that has the same diameter as the sliding contact portion 5b also comes into contact, compared to the conventional example. The tape is less likely to be damaged.

As described above, the present invention is useful because it can prevent the tape from being damaged by the leading guide pin during unloading.

[Brief explanation of the drawing]

1 is a schematic plan view and a front view showing the relationship between a loading disk and a cassette; FIG. 2 is a front view, a top view, and a bottom view showing the upper end portion of an embodiment of the present invention; FIG. 3 shows the contact between the leading guide pin and the tape, and A is a perspective view of a conventional example, and A is a perspective view of an embodiment of the present invention. Explanation of main drawing numbers, 5...Leading guide pin, 8b
... Slope section, 1 ... Loading disc.

Claims (1)

[Claims for Utility Model Registration] A leading guide pin that is set up on a loading disk, comes into contact with the magnetic tape first during loading, and has a sloped portion at the top that increases in diameter upward, comprising: A leading guide pin characterized by having a notch on the side that contacts the magnetic tape.