JPH04137531U - Magnetic tape guide roller device - Google Patents

Abstract

(57) [Summary] [Purpose] In tape guide roller devices used in video tape recorders, etc., it is possible to significantly reduce tape running loss, prevent stick-slip, and reduce roller rotation loss. To provide an inexpensive magnetic tape guide roller device that effectively absorbs longitudinal vibration and allows easy adjustment of flange height. [Structure] A roller 3, which has a flange 3b at least at its lower end that abuts the side edge of the magnetic tape T to regulate the running position of the magnetic tape, and a threaded portion 3c at its upper end, is connected to the substrate 2. An adjustment screw 5 which is rotatably inserted into a shaft 1 implanted in the shaft 1, has a cylindrical hole opening downward, and has a threaded portion 5b screwed into the threaded portion 3c on the inner surface of the hole. is screwed together, and the bottom surface 5a of the hole is brought into contact with the tip of the shaft 1, so that the roller 3 is rotatably held on the shaft 1. A magnetic tape guide roller device is obtained.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention is used in video tape recorders, etc. to This relates to a guide roller device for magnetic tape that runs on a magnetic tape. It guides the magnetic tape along a predetermined path and also absorbs the longitudinal vibration of the magnetic tape. It is effective when applied to impedance rollers.

0002

[Conventional technology]

A conventional magnetic tape guide roller device will be described below.

0003 Figure 2 shows the tape running path (tape pattern) during recording and playback of an 8mm video tape recorder. This is an example of the following. The tape T is pulled out from the supply reel 6 of the cassette, and Post 7 regulates tape height, tension post stabilizes tape tension 8. Impedance roller 9, which absorbs the longitudinal vibration of the tape, adjusts the running height of the tape. A regulating roller post 10, an inclination to easily wrap the tape around the cylinder. Passes through the diagonal post 11 to a rotating shaft for recording on tape or playing back from tape. The cylinder 12 has a built-in head, and a cylinder 12 has a tilting mechanism to easily change the direction in which the tape travels. Diagonal post 13, roller post 14 that regulates the running height of the tape, roller post 1 5. Pass through the inclined post 16 to allow the tape to run horizontally, and then The tape is fed out using the shaft 17 and the pinch roller 18, and the running height of the tape is adjusted. The cassette is stored again on the take-up reel 20 of the cassette via the regulating post 19.

0004 FIG. 3 is a side sectional view showing the structure of the impedance roller 9. 21 is a shaft with a threaded portion 21a cut at the tip, which is press-fitted into the board 22. Ru.

[0005] 24 comes into contact with the lower edge of the magnetic tape T, and the magnetic tape T falls off downward. It is a lower flange that has a surface on its upper surface that regulates the It is movably inserted.

[0006] 23 is a compression spring inserted between the lower flange 24 and the base plate 22; The lower flange 24 is always urged upward.

[0007] 26 is a sleeve whose lower end is in contact with the upper surface of the lower flange 24; It is rotatably inserted into the shaft 21, and a roller 27 is rotatably inserted thereon. .

[0008] 28 is an annular body made of brass fitted to the upper end of the roller 27; This increases the inertia of the roller 27.

[0009] 29 is movably inserted into the shaft 21 so as to come into contact with the upper end of the sleeve 26. The adjustment nut 30 screwed into the threaded part 21a allows the upper flange to be moved upwardly. movement is regulated. That is, the sleeve 26 and the upper flange 29 The sleeve 26 is held between the lower flange 24 and the roller 27. By configuring the roller 27 to be slightly longer than the length of It is configured to rotate while in contact with the shaft 24.

0010 The operation of the magnetic tape guide roller device configured as above is explained below. I will explain about the work. First, to adjust the height of the lower flange 24, rotate the adjustment nut 30. By doing so, the lower flap, which is constantly receiving force from the bottom to the top due to the force of the compression spring 23, By pressing the flange 24 through the upper flange 29 and the sleeve 26, the upper and lower Slide adjustment is possible. With this adjustment, the lower end of the tape is aligned with the upper surface of the lower flange 24. Adjust the height so that it touches lightly. While the tape T is in contact with the outer periphery of the roller 27, By running, it can rotate together with the tape. At this time, the tape This structure absorbs vibrations in the vertical direction.

[0011]

[Problem that the idea aims to solve] However, in the above conventional configuration, the lower flange 24 does not rotate, so the tape Contact with edges increases loss, increases tape tension, and in some cases Stick-slip occurs, causing longitudinal vibrations in the tape. Laura again When rotating, it rotates with a wide contact area with the lower flange 24, which increases loss. , there is a problem that the inertia up effect of the brass 28 is reduced. Ta.

0012 This invention solves the above-mentioned conventional problems and eliminates the contact between the tape and the guide flange. Eliminates stick-slip and increased loss due to roller rotation, and reduces roller rotation loss. , an inexpensive magnetic tape guide roller that fully brings out the inertia-up effect. The purpose is to provide equipment.

[0013]

[Means to solve the problem]

In order to achieve this purpose, the magnetic tape guide roller device of the present invention has at least The lower end of both contacts the side edge of the magnetic tape to regulate the running position of the magnetic tape. A roller with a flange and a threaded part formed on the upper end is implanted into the substrate. It is rotatably inserted into the shaft and has a cylindrical hole that opens downward. An adjustment screw having a threaded portion on its surface that is threaded into the threaded portion, and screwed together both the threaded portions. At the same time, the bottom of the hole is brought into contact with the tip of the shaft, and the roller is moved into the shaft. It is rotatably held on a shaft.

[0014]

[Effect]

According to this configuration, the flap is in contact with the lower edge of the tape and regulates the running position of the tape. The lunge is formed integrally with the roller and configured to rotate together with the roller. This prevents increased loss and stick-slip due to contact between the tape and flange. In addition, since the roller is rotatably supported by the tip of the shaft, rotation loss of the roller is reduced. By effectively utilizing the inertia by reducing the inertia, the longitudinal vibration absorption effect of the tape is enhanced. Therefore, by having a tape guide height adjustment mechanism with a simple structure, an inexpensive magnetic It can be a tape guide roller device.

[0015]

【Example】

An embodiment of the present invention will be described below with reference to the drawings.

[0016] In Figure 1, 1 is a shaft with a spherical tip and is press-fitted into the substrate 2. . 3 is a flange 3b whose lower end touches the lower edge of the tape T and regulates its running position. It is a tape guide roller with a tape guide roller that is inserted into the shaft 1 and can be rotated lightly. 4 is circular It is press-fitted into the upper end of the tape guide roller 3 using brass.

[0017] 5 is an adjustment screw, which has a hole in the center that opens downward; A threaded portion that is threadedly engaged with a threaded portion 3c formed at the upper end of the tape guide roller 3 on the surface. 5b. This adjustment screw 5 screws together the threaded portion 5b with the threaded portion 3c. In the closed state, the bottom surface 5a of the hole is brought into contact with the tip of the shaft 1.

[0018] That is, the tape guide roller 3 is rotatably supported by contact with the tip of the shaft 1. The height position on the shaft 1 in the suspended state is regulated by the adjustment screw 5 held. It is.

[0019] Therefore, by rotating the adjusting screw 5 relative to the roller 3, , the height can be adjusted by adjusting the screwing state of the threaded parts 3c and 5b. be.

[0020] As described above, according to this embodiment, the flange that contacts the edge of the tape is aligned with the roller. Rotating the tape with your body reduces tape running loss and prevents stick-slip. In addition, it is possible to prevent rotation by making point contact with the spherical part at the tip of the shaft. Rotation loss can be extremely reduced, and the height of the flange can be adjusted using tape guides. This can be done by adjusting the rollers and adjustment screws, making it possible to construct an inexpensive adjustment mechanism. Ru.

[0021]

[Effect of the idea]

As described above, the present invention has a flap that comes into contact with the edge of the tape to regulate the height of the tape. The tape contacts the tape while rotating, greatly reducing tape running loss. It is also possible to prevent stick-slip from occurring. Also, the rotation loss of the roller can be reduced to point contact. The longitudinal vibration of the tape is absorbed by increasing the inertia. This is an inexpensive magnetic tape that enables the height of the flange to be easily adjusted using screws. A guide roller device can be realized.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a magnetic tape guide roller device according to an embodiment of the present invention.

[Fig. 2] A plan view for explaining the tape running route in the same embodiment.

[Figure 3] Cross-sectional view of a conventional magnetic tape guide roller device

[Explanation of symbols]

1 axis 2 Board 3 Tape guide roller 3b flange 3c Thread part 4 Brass 5 Adjustment screw 5b Threaded part

Claims (1)

[Scope of utility model registration request] Claim 1: A roller having a flange at least at the lower end that contacts the side edge of the magnetic tape to regulate the running position of the magnetic tape, and a threaded portion formed at the upper end is embedded in a substrate. An adjustment screw is rotatably inserted into the shaft, has a cylindrical hole opening downward, and has a threaded portion on the inner surface of the hole that is screwed into the threaded portion. A magnetic tape guide roller device in which the roller is screwed together and rotatably held on the shaft by bringing the bottom of the hole into contact with the tip of the shaft.