JPH02165455A - Recording or playback device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a recording or reproducing apparatus that draws out a tape from a cassette and winds it around a head drum to form a predetermined tape running path.

(Prior Art) Conventionally, in video tape recorders (hereinafter referred to as VTRs) and the like, a tape is pulled out from a power set and wound around a head drum to form a predetermined tape running path for various purposes such as recording and playback. A tape loading mechanism is adopted that enables this operation.

There are various types of tape loading mechanisms depending on the tape recording format and the design of the tape running path.

FIG. 5 shows an example of a tape running path of a conventionally commonly used VTR.

In the same figure, the tape T is moved from a cassette C loaded in a predetermined cassette mounting portion on the chassis 1 to supply side movable guide posts 2a, 2b and take-up side guide posts 3a, 3b.
The magnetic head is pulled out by a rotary head drum 4 which has a magnetic head therein and is wound at a predetermined angle around a rotary head drum 4 which is rotated by a motor at a predetermined number of revolutions. Further, 5 is a tension regulator bin that detects the tape tension and keeps it constant, 6 is an impedance roller, 7 is a capstan, 8 is a pinch roller, and 9 is a guide for the entrance to cassette C on the winding side of the cassette. The tape guide forms a tape running path together with the above-mentioned guide posts 2a, 2b, 3a, and 3b.

With the above configuration, as shown in the figure, the tape is pulled out from the supply line Rs, and the tension regulator bin 5,
Guide roller 6, guide posts 2a, 2b, rotating head drum 4, guide posts 3b, 3a, capstan 7,
A tape travel path for winding the tape onto the guide post 9 and the take-up reel Rt is formed.

Incidentally, in recent years in the field of VTRs, it has become extremely important to make the device smaller and lighter in order to improve its portability, and many attempts have been made to miniaturize the tape loading device itself in order to make it smaller and lighter. ing.

One effective means of downsizing the tape loading mechanism is to reduce the diameter of the rotary head drum itself, which occupies a large space within the device, and to downsize the entire mechanism accordingly.

When this method is adopted, in order to maintain tape format compatibility, the number of heads in the rotating head drum is increased, the rotation speed of the rotating drum is increased, and the wrapping angle of the tape around the rotating head drum is increased. It is necessary to take measures at the same time.

(Problem to be Solved by the Invention) However, as mentioned above, if the wrapping angle of the tape around the rotating head drum is widened (then, due to the synergistic effect of reducing the diameter of the head drum, the running load of the tape, that is, the tape tension increases). However, this effect becomes particularly large during high-speed running.For example, before and after a large load is applied to the rotating head drum, the tape tends to sag in the tape guide section that serves as the tape supply side, and this causes an increase in the tape wrapping angle. As a result, the tape guide posts are located close to each other, so they come into contact with the tape running oppositely and with other tape guide posts, further increasing the running load.If this effect is large, However, there is a risk that the tape itself will not be able to run, which is a serious problem that hinders the miniaturization of tape loading devices.

(Means for Solving the Problems) The present invention has been made with the aim of solving the above-mentioned problems, and its characteristics are that the tape is pulled out from the cassette, wound around the head drum, and then the predetermined tape is A plurality of guide posts including movable guide posts forming a running path are provided, and between predetermined guide posts that are close to each other among the guide posts, interference with the tape running system other than the guide posts to which the running tape is to be guided is prevented. A recording or reproducing device is equipped with an interference prevention means to prevent such interference.

Further, the present invention is provided with a movable guide post that pulls out the tape from the cassette and wraps it around the head drum to form a predetermined tape running path, and the movable guide posts are configured to form the tape running path at positions that are close to each other. This is a recording or reproducing apparatus in which interference prevention means for preventing interference between tapes running opposite to each other is arranged between the guide posts.

(Function) This prevents tapes from coming into contact with each other or with guide posts other than the opposing guide post to be guided, even if different parts of the tape guide post, that is, the tape running path are close to each other. can do.

(Embodiment) An embodiment of the recording or reproducing apparatus according to the present invention will be described below with reference to the respective figures.

FIGS. 3(a) and 3(b) respectively show the tape loading state and tape unloading state in the apparatus of the present invention.

In each figure, 10 is a main chassis, 11 is a rotary head drum rotatably arranged on the main chassis while being inclined at a predetermined angle, and 12 is inside a recess C1 formed in the front part of the cassette C in the unloading state. A movable tape supply side guide post 13 consisting of guide posts 12a and 12b that pulls out the tape from the cassette and wraps it around the rotary head drum 11 along with the tape loading operation is also formed at the front of the cassette C in the unloading state. The guide post 1 on the tape supply side is housed in the recess C1, and the tape supply side guide post 1 is
2 and guide posts 13a, 13 that pull out the tape T from the cassette and wrap it around the rotating head drum 11.
A movable tape winding side guide post 14 is in pressure contact with the tape during tape running to detect the tension of the tape T and keep it constant; 15 and 16 are tension regulator bins 14 and 14. Move the supplied tape to the movable guide post 1
A guide post that guides you to 2.

and a guide post composed of an impedance roller.

Also, 17 is a movable guide post that adjusts the tape T coming out from the tape winding side guide post 13 to a state parallel to the cassette C, 18 is a capstan, and 19 is in pressure contact with the capstan 18 with the tape in between to run the tape. A pinch roller 20 is a guide post that guides the tape sent out from the capstan to the cassette C.

On the other hand, 21 is a cassette mounting part 22 into which the cassette C is loaded.
It is a movable chassis formed with a cassette, and is arranged to be slidable back and forth with respect to the rotary head drum 11 in an unloading state and a loading state, and engages with the supply reel Rs and take-up reel Rt of a loaded cassette, respectively. Supply side 1 winding side reel stand 23a, 23 for rotating this
b is rotatably disposed, and a tension reginilevator bin 14. A pinch roller 19 and a guide post 20 are arranged so as to operate as will be described later to form a tape running path as shown in FIG. 3(a).

Next, the tape loading operation will be explained.

In the unloading state shown in FIG. 3(b), the movable chassis 21 is in a retracted position with respect to the rotary head drum 11, and the movable guide posts 12, 13, 17, the tensilon regulator bin 14, the pinch roller 19, the guide post 20 and the like are all housed in the recess C1 at the front of the cassette C. In this state, the cassette can be attached and detached by known means.

In this unloading state, when a tape loading operation is started by a control means (not shown), the tape supply side movable guide posts 12a and 12b, the tape winding side movable guide posts 13a and 13b, and the movable guide post 17
are operated by an operation mechanism (not shown), respectively, to pull out the tape T from the recess C1 of the cassette C and load it onto the rotary head drum 11, and at the same time, the movable chassis 21 is advanced toward the rotary head drum 11.

As a result, the pinch roller 19, tension regulator bin 14, and guide post 2o arranged on the movable chassis 21 move forward together with the movable chassis, and rotate outwardly by an interlocking mechanism (not shown) to pull out the tape from the recess C1 of the cassette C. Then, the tape loading state shown in FIG. 3(a) is reached.

On the other hand, according to this embodiment, if the rotary head drum 11 has a small diameter of 26.7φ and is compliant with, for example, an 8 mm video format, the winding angle of the tape around the rotary head drum 11 is determined by the video signal. The recording area and the PCM audio signal recording area are about 330 degrees, and the rotation speed of the rotary head drum 11 is 270 Or, p, m.

becomes.

Therefore, in the tape loading state, the movable guide post 12 on the tape supply side and the movable guide post 13 on the tape winding side are in a very close positional relationship.

Figures 1(a) and 1(b) are enlarged plan views of this part, and Figure 1(a) shows the state in which tape loading has been completed;
b) shows the state immediately before tape loading is completed. Further, FIG. 2 is a side view of the state shown in FIG. 1(a) as viewed from the direction of the arrow.

In each figure, 12c is a support member to which guide posts 12a and 12b are attached, and 13c is a support member to which guide posts 13a and 1 are attached.
3b is attached to the support member, 24 is the rotating head drum 1
1 on the main chassis l.

Due to the tape loading operation described above, the support member 12.13 is moved around the rotating head drum 11 along the guide grooves 24a and 24b for guiding the movable guide post 12.13 formed on the drum base 24, and the tape is moved around the rotary head drum 11. The tape is wound around the drum 11 and positioned at a predetermined tape loading position by positioning members arranged at the ends of the guide grooves 24a, 24b.

As shown in FIG. 2, the tape supply side guide post 12a
, 12b and tape winding side guide posts 13a, 13b
partially overlap in the axial direction, as shown in Figure 1 (
As shown in a), the gap is also extremely narrow, and if the tape slackens in this gap, the tape will be guided by the opposing guide post and run in the opposite direction, or the tape will run in the opposite direction, or the tape may run in the opposite direction or It is easy to come into contact with support members 12c, 13c, etc., which have poor surface roughness, and if they come into contact with them, the running load will increase significantly and the running of the tape will be hindered.

This kind of operation occurs in the tape loading state.
When the tape is reversed, for example, when performing high-speed rewinding, high-speed search in the reverse direction, reverse playback, etc., and the higher the speed, the more likely it is to occur. In other words, the supply reel stand 23a becomes a take-up reel, and its winding torque is weaker than when winding with the capstan 18.
This is because since the tape is on the supply side with respect to the rotating head drum 11, the tape tension at the guide posts 13a and 13b becomes weaker, and the tape becomes more likely to slacken.

Therefore, according to the present invention, the tape guide post 12 (1
An interference prevention member 25 for preventing tape interference is arranged between 2a, 12b) and 13 (13a, 13b) so that the slack tape does not come into direct contact with other guide posts or the tape running in the opposite direction. There is. This interference prevention member 25 is attached to a portion of the movable guide post 13 of the drum base 24 facing the front surface of the support plate 13c by known means such as adhesive or screwing. In addition, the interference prevention member is made of synthetic resin or metal and has a smooth surface, and because the tape slides on it, static electricity is likely to be generated. It can be grounded onto the main chassis 1 via. Therefore, it is effective not only for reducing the running load of the tape, but also for removing noise from video signals and other control signals.

In addition, in the example of FIG. 1 and FIG. 2, the case where the interference prevention member is attached to the drum base was explained, but as shown in FIG. You can also do that.

Further, an interference prevention member may be provided on the support member 12 side.

Furthermore, the present invention is not limited to disposing an interference prevention member between the movable guide posts 12 and 13 (the present invention can be applied to any guide means in a portion where tapes run close to each other). be.

(Effects of the Invention) As described above, according to the recording or reproducing apparatus of the present invention, the interference prevention member is arranged in the mutually close parts of the tape guide post so that the tapes running oppositely do not interfere with each other. Even if the tape becomes slack and bulges out of the tape running path, it will not interfere with the tape running system other than the guide post to be guided or other parts of the tape running path, thereby increasing unnecessary load on the tape running system. (There is no danger of interfering with tape running.

Therefore, it is necessary to downsize the device (as a result of reducing the diameter of the rotating head drum, the tape winding angle increases, and even if the tape guide posts are arranged close to each other, the tape may slide against other tapes and interfere with their running. This method is extremely effective in promoting miniaturization of the device, since it is possible to always achieve a good and high-speed tape running condition without any problems.

[Brief explanation of the drawing]

1(a) and 1(b) are partial plan views in different operating states for explaining the configuration of the recording or reproducing apparatus according to the present invention, and FIG. 2 is a partial plan view in the state of FIG. 1(a). 3(a) and 3(b) are plan views respectively showing the tape running path in the tape loading state and tape unloading state of the recording or reproducing apparatus according to the present invention; FIG. 5 is a partial side view showing another embodiment of the present invention, and FIG. 5 is a plan view showing an example of a tape running path in a conventional VTR. C...Cassette T...Tape lO...Main jar seat...Rotating head drum 2.13.17...Movable guide post 4...Tension regulator pin 5.16.20...Guide post Movable chassis 8... Capstan 9... Pinch roller 4... Drum base 5... Interference prevention member (Fig. 1 Cb) +2,13: Moving force (Fig. 3) b)

Claims (3)

[Claims] (1) A plurality of guide posts including a movable guide post that pulls out the tape from the cassette and wraps it around the head drum to form a predetermined tape running path are provided; What is claimed is: 1. A recording or reproducing device comprising an interference prevention means for preventing interference with a tape running system other than a guide post to which a tape is to be guided. (2) A movable guide post is provided for pulling out the tape from the cassette and winding it around the head drum to form a predetermined tape running path, and the movable guide posts are arranged to form the tape running path at positions close to each other;
A recording or reproducing apparatus characterized in that an interference prevention means for preventing interference between tapes running opposite to each other is arranged between the guide posts. (3) A recording or reproducing device according to claim (1) or (2), wherein the interference prevention member is made of a conductive material.