JPS62287461A - Tape guiding device for recording and reproducing device - Google Patents

Abstract

PURPOSE:To lower tape tension by stopping a roller guide of tape supply side of a rotary drum to use it as a fixed guide at the time of recording and reproducing and reverse recording and reproducing, and rotating only tape take-up side. CONSTITUTION:At the time of recording and reproducing of a video tape recorder, a tape 2 runs from a supply reel through the first roller guide 3, a first taper guide 5, a rotary drum 1, a second taper guide 6 and a second roller guide 4 as shown by the arrow mark and taken up on a take-up reel. In such a case, the rotation of the first roller guide 3 is stopped and used as a fixed guide. Assuming tape tension is increased by each fixed guide by 10g, and when back tension of 40g is supplied to the tape 2 of tape supply side, then tape tension of the rotary drum 1 goes to 60g, and tape tension of the tape 2 of tape take-up side goes to 70g. Thus, tape tension of tape supply side and tape take-up side can be held down to low level.

Description

[Detailed description of the invention] 3. Detailed description of the invention.

[Industrial Application Field] The present invention provides a recording and reproducing device capable of reverse recording and reproducing, which has a pair of roller guides on the tape supply side and the tape winding side of a rotating drum to change the tape running direction without increasing tape tension. The present invention relates to a tape guide device.

[Summary of the Invention] The present invention provides a tape guide device for the recording/reproducing apparatus such as a video tape recorder, in which one of the pair of roller guides located on the tape supply side is used during recording/reproducing and reverse recording/reproducing of the recording/reproducing apparatus. By using the roller guide as a fixed guide that applies tape tension, and the other roller guide located on the tape winding side as a tape feeding rotating roller, vertical vibration of the tape on the tape supply side etc. is prevented, and recording and playback are prevented. The tape tension on both the tape supply side and the tape winding side can be kept low regardless of the time or reverse recording/reproduction.

[Prior Art] In a video tape recorder (recording/playback device), tape is loaded in a spiral shape around the circumference of a rotating drum.

There is a so-called helical scanning method in which the video head is scanned by moving the video head. The tape is loaded onto the rotating drum by a tape guide device.

That is, the running direction of the tape supply side and tape winding side of the rotating drum is changed by a pair of roller guides, and the inclination angle of the tape to the rotating drum is changed by an entrance/exit taper guide (fixed guide). The drum and video head surface and the tape run and come into contact with each other at a predetermined tape tension.

[Problems to be Solved by the Invention] The roller guide can change the tape running direction without increasing tape tension, but when the roller guide rotates, the roller guide is tilted due to the influence of the tape tension. However, since the tape is subjected to the force of the upper tool depending on the tape running direction, longitudinal vibrations occur in the tape, resulting in a change in height in the tape running direction. To deal with this, a mechanism for adjusting the inclination of the roller guide was added to complicate the structure, and a fixed guide was used to increase the tape tension more than necessary.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a tape guide device for a recording/reproducing apparatus that can prevent longitudinal vibration of the tape and keep the tape tension low.

[Means for solving the problem] A tape recording and reproducing device capable of reverse recording and reproducing, which has a pair of roller guides on the tape supply side and tape winding side of a rotating drum to change the tape running direction without increasing tape tension. In the guide device, during recording/reproduction and reverse recording/reproduction, one of the pair of roller guides located on the tape supply side serves as a fixed guide for applying tape tension, and the other roller guide is located on the tape winding side. The guide is a tape feeding rotating roller.

[Function] During recording/reproduction and reverse recording/reproduction of the recording/reproducing device, one roller guide located on the tape supply side of the rotating drum stops rotating and feeds the tape while applying tension to the tape. The other roller guide on the take-up side feeds the tape while rotating.

[Example] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 and FIG. 2 show an example of the arrangement of tape guide devices in a helical type video tape recorder (recording/playback device). This tape guide device is a rotating drum! A pair of first . a second roller guide 3.4 and a pair of first . It has a second tapered guide 5.6.

As shown in FIG. 3, the above 1. Second roller guide 3
．． The lower end of 4 is connected to a brake mechanism 8.9 which is electrically connected to the system computer 7. These brake mechanisms 8 and 9 are activated by instructions from the system computer 7 to operate one of the roller guides (first roller guide 3 in FIG. 1 and roller guide 20 in FIG. 2) located on the tape supply side (S side in the figure). - Only the rotation of the guide 4) is locked and stopped.

Figure 1 shows tape 2 during recording and playback on a video tape recorder.
Fig. 2 shows the flow of the tape 2 during reverse recording and playback, but in both cases, at the loading portion of the tape 2 on the rotating drum 1, the tape 2 and the rotating drum ! A certain amount of tension is required for the head (not shown) to make contact. For example, the tape tension required for contact between the head of rotating drum 1 and tape 2 is 60 g.
Then, the tape tension applied to the tape 2 on the tape supply side and the tape winding side (T11 in the figure) during recording and reproduction of the video tape recorder is as follows.

During recording and playback of the video tape recorder shown in FIG. 1, the tape 2 is transferred from a supply reel (not shown) to a first roller guide 3 as shown by an arrow in the figure. First taper guide 51 rotating drum 1. 2nd taper guide 6, 20th-ra guide 4
and is taken up by a take-up reel (not shown).

In this case, the rotation of the 10th guide 3 is stopped and it becomes a fixed guide, and if the tape tension is increased by 10 g due to each fixed guide, then the tape 2 on the tape supply side is
If 0g of tension is applied, the tape tension of rotating drum j will be 609, and the tape tension of tape 2 on the tape winding side will be 70g (Table 1-I).
.

Table 1 This Table 1 shows the first. Tape supply side (S side) in each combination of rotation and stop of the second roller guide 3°4
This is a comparison of the tape tension on the tape winding side (T side). As a result, during recording and playback of the video tape recorder, the above embodiment in which the 10th guide 3 is stopped and the 20th guide 4 is rotated is more effective than Ike's @massage (from ■ to ■ in Table 1). The tape tension on both the supply side and the tape winding side can be held low. As a result, the inclination of each guide due to tape tension is eliminated, longitudinal vibration of the tape 2 in the running direction is prevented, and scratches on the edge portions of the tape 2 can be reliably prevented.

Furthermore, during reverse recording and playback of the video tape recorder shown in FIG. 2, the running direction of the tape 2 is reversed from that shown in FIG. The 10th roller guide 3 located on the tape winding side becomes a rotating roller for feeding the tape 2, so the tape tension on the tape supply side and the tape winding side can be adjusted as in the case of Fig. 1. Both can be lowered.

A pair of roller guides each having a built-in one-way clutch bearing and configured to rotate only in one opposite direction may be arranged on the tape supply side and the tape winding side of the rotary drum 1.

[Effects of the Invention] As described above, according to the present invention, during recording/reproduction and reverse recording/reproduction of a recording/reproducing device, the roller guide located on the tape supply side of the rotating drum is stopped among the pair of roller guides, and the fixed guide In addition, by rotating only the other roller guide located on the tape winding side, it is possible to reduce tape tension on both the tape supply side and the tape winding side regardless of any of the above cases. can. This makes it possible to prevent longitudinal vibration during tape travel due to the influence of the inclination of the tape guide.

[Brief explanation of drawings]

The drawings show one embodiment of this invention, and include Fig. 1,
FIG. 2 is a schematic diagram of tape guide installation, and FIG. 3 is a block diagram of a roller guide. ■... Rotating drum, 2... Tape, 3, 4... Roller guide.

Claims (1)

[Claims] Recording and playback and reverse recording and playback are performed in a tape guide device of a recording and playback device capable of reverse recording and playback, which has a pair of roller guides on the tape supply side and the tape winding side of a rotating drum to change the tape running direction without increasing tape tension. At times, one of the pair of roller guides located on the tape supply side serves as a fixed guide that applies tape tension, and the other roller guide located on the tape winding side serves as a tape feeding rotating roller. A tape guide device for a recording/playback device.