JPS63229657A - Half loading device - Google Patents

Abstract

PURPOSE:To prevent the damage of a tape or the like in a half loading device with a simple constitution by providing a tape leading-out means which leads out the tape and a control means which fixes the tape leading-out means to a prescribed position. CONSTITUTION:A tape leading-out means 23, which leads out the tape to match the tape to a fixed head at the time of switching the mode from the stop mode to the fast winding mode after loading of a tape cassette, and the control means which fixes the tape leading-out means 23 to a prescribed position are provided. The tape is in the led-out state in the stop mode as well as the fast winding mode. Consequently, the tape leading-out means 23 interlocking with a moving member 17 for mode control is fixed after being moved to a prescribed position by the first movement after tape loading, and movement of the moving member 17 and the tape leading-out means 23 do not interlock with each other, and half loading of the tape is executed in the stop mode and the fast winding mode. Thus, the damage of the tape is prevented without complicating the constitution and the malfunction of control signal reproducing is prevented.

Description

[Detailed description of the invention] A) Industrial application field The present invention is a VH3 type video tape recorder (VTR).
The present invention relates to a half loading device used for.

(b) Conventional technology In VH5 type VTRs, the tape is housed in a cassette in fast forward and rewind modes, and a dedicated head is often used for cueing and the like. However, there is a method that uses control signals to cue the beginning of a program, and in order to use this method, it is necessary to partially pull out the tape and bring it into contact with the control R/P head even in fast forward and rewind modes. There is.

For example, Japanese Patent Laid-Open No. 61-18475
There is one disclosed in Publication No. 5 (G11B15/665). This drives the tape drawer bin with drive means for winding the tape around the guide cylinder;
In the stop/early spring mode of the VTR, the tape comes into sliding contact with the control R/P head.

By the way, when the stop mode and the fast winding mode are performed in the same state as described above, the braking means of the reel stand must be controlled by a reel noid or the like. In other words, with only the drive means (motor) for tape loading, the VT
When trying to control various modes of R, the above configuration cannot be adopted.

On the other hand, when the stop mode and the fast-winding mode correspond to different states of the mechanism, half-loading may be performed in the fast-winding mode. But stop/
If operations such as fast forwarding are performed repeatedly, the tape is pulled out each time, which may damage the tape or make the tape winding around the fixed control R/P head unstable, resulting in inaccurate near counter reading. There is also a possibility that this will not be possible.

On the other hand, it is possible to increase the number of modes such as cassette loading mode, stop mode, and fast winding mode, so that half loading can be performed in stop mode and fast winding mode. In this configuration, since the number of modes to be controlled increases, the number of position detection means increases and the structure becomes complicated.

i/Sai Problems to be Solved by the Invention In the present invention, in a configuration in which the drive means for tape loading is shared and the mode of the mechanism is controlled, the number of states of the mechanism is not increased. The purpose of this invention is to prevent damage to the tape in a half-loading device without complicating the structure.

B) Means for solving the problem The present invention controls at least a stop mode and a fast winding mode by moving a moving member for mode control linked to a drive means for tape loading. When transitioning from the stop mode to the fast winding mode, the tape drawing means is provided for drawing out the tape and adhering it to the fixed head, and the regulating means is provided for fixing the tape drawing means at a predetermined position. It is characterized in that the tape is in a drawn out state in both the stop mode and the fast winding mode.

In other words, the tape pull-out means that is interlocked with the moving member for mode control is moved to a predetermined position by the first movement after the tape is attached, and then is fixed. is no longer relevant, so half-loading of the tape will be performed in stop mode and fast wind mode.

(f) Example Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 to 6 and 7 are plan views showing the main parts of the embodiment, Figure 4 is a plan view showing the tape running path, and Figures 5 and 6 are means for fixing the tape drawing means. It is a top view and a side view which show.

First, the tape running path will be explained based on FIG. 4. In the figure, (1) is a tape force set), (21 is a supply IJ), (3) is a take-up reel, (4) is a magnetic tape, (5) is a rotating guide cylinder with a rotating head, (
6) is a back tension detection pin, (7) is an impedance roller, (8) is a full width erasing head, (9) αQ is a pair of tape drawer members for winding the tape around the rotating guide cylinder (5), αD is audio/control R
/P head, 3 is a fixed guide, α3 is a pinch roller, 3 is a capstan, and 4 is a tape pull-out pin for half loading.

In FIG. 4, the tape running path when the cassette is installed is shown by a dashed line, a solid line in fast winding mode (fast forward 7 rewinds), and a broken line in playback mode.

In the VTR of this embodiment, when a cassette is loaded by a well-known method, the VTR is in a stop mode, and then as the loading motor (not shown) rotates, the mode changes to fast winding mode and playback mode. In the figure, the first
The figure shows when the cassette is installed, Figure 2 corresponds to the fast winding mode, and Figure 3 corresponds to the playback mode.

In FIGS. 1 to 3, 06) is a mechanism control slide lever (only a portion of which is shown, and is actually located on the back side of the mechanism chassis) that is moved in accordance with the rotation of the loading motor.

By moving this slide lever (1B+), the brake of the reel stand, the reel stand drive mechanism, etc. are controlled.

(171 is a pinch roller lever rotatably supported around a shaft (181 (planted on the chassis); one end (17a) of the pinch roller α3 is rotatably supported; the other end (17b) and the slide lever (16) are tensioned with a spring (1ω), and the slide lever (
As the pinch roller lever 161 moves, the pinch roller lever 〇η rotates. Also, the end of the pinch roller lever aη (17
In a), an engaging pin clip is planted.

(211 is a rotating lever that is rotatably supported around a shaft (support) installed on the chassis, and a cam surface (21a) that comes into contact with the engagement pin ■ is formed in a part of it. The tape pull-out lever (23) is supported rotatably around an axis (to) set on the chassis, and has a tape pull-out pin (■). A torsion spring (23a) which is fitted and whose end engages with the stopper pin (2) of the tape pull-out lever (23a) is biased counterclockwise.

Of course, the rotation of the rotation lever 圓- is changed to the tape drawer lever +2.
3), and is connected to the rotation lever 0υ and the tape pull-out lever by shaft @4, respectively. ■
is a fixed bracket with a fixed head αD.

In the stopped state in FIG. 1, when the cassette is mounted on the VTR, the pair of tape pull-out members (9) α0), the pull-out pin of the tape pull-out lever, and the capstan shaft are inside the tape.

The rotating lever (2υ) has a locking part (21b) on the cam surface (2υ).
1a) is formed at a position across the axis □□□.

This locking portion (21b) is in contact with the tip (1a) of a locking plate (31) (with a t17 ting), which will be described later, when the cassette is attached.

The locking plate (31) is fixed to the support plate (3) so as to rotate around the shaft can. In addition, the pin (to) regulates the movement of the locking plate Gυ, and the pin (to) is a groove (31a) of the locking plate (31).
). Further, a solenoid can is also fixed to the support plate (2), and the locking plate Gυ can be moved counterclockwise in FIG. On the other hand, the locking plate (3υ) is biased clockwise in the figure by a spring.

The support plate is fixed on the mechanism chassis with screws.Then, after temporary fixing, its position is adjusted to the notch (32a
) is adjusted by inserting a screwdriver or the like into the hole (52b) and rotating the support plate (support) around the hole (52b). Therefore, the holes (32c) (32d) have a slightly larger diameter.

Next, the operation will be explained according to FIGS. 1 to 3.

When the cassette is installed, the tape drawer lever does not move. At the slide lever position shown in FIG. 1, the main brake of the reel stand is in operation.

When the loading motor rotates in the tape loading direction, the opening of the slide lever α starts moving in the direction of arrow A), and the pinch roller lever α starts rotating counterclockwise in the figure.

As the pinch roller lever αη rotates, the pin ■ and the cam surface (21a) begin to come into contact with each other, and the tape pull-out lever (2
3) clockwise rotation is performed. Tape withdrawal is then started. At the same time, as the locking portion (21b) of the rotary lever (21b) rotates clockwise, the locking plate (31)
It is moved in the direction of arrow (2) against the bias of the cover spring (361).

When the cassette is loaded into the VTR by a well-known method,
In the VTR of this embodiment, the mode detection means (not shown) controls the movement of the slide lever (1fliJ) so that the mode is set to the playback mode and then returned to the stop mode. The process continues until the detection is detected.

When the playback mode is reached, the pinch roller lever (1
The rotation of η stops, and the state at this time is as shown in FIG. In this state, the rotation lever (Inc.) is rotating significantly, so the locking portion (21b) and the locking plate Gυ
At the point where the contact is released, the locking plate (3υ) reaches the position where it is regulated by the pin (to).

It is forced to return by a spring circle.

Thereafter, a command from the mechanism control circuit causes the loading motor to rotate in reverse and return to the stop mode. In other words, the slide lever (10) moves in the direction of arrow C, and the pinch roller lever α force rotates clockwise. (21C) and the side part (31b) of the locking plate (9).Therefore, the tape pull-out lever (23) is fixed at a certain position.Now,
The tape remains half-loaded even when the VTR next enters stop mode.

In other words, after the tape carrier cassette is installed, the tape is pulled out a little and attached to the fixed control R/P head in the stop mode and fast winding mode.

For this reason, the early spring mode position is set at a position where the cam surface (21a) of the rotary lever (manufactured by Co., Ltd.) and the pin (2) of the pinch roller lever αη do not come into contact, as shown in FIG.

The position of the locking plate G1) regulates the position inside the tape pull-out pin, so the position of the locking plate (9) is adjusted (as described above, this is done by adjusting the position of the support plate). The tape running path during loading is defined.

In other words, what determines the tape running path is independent from the drive system of the tape pull-out means. Therefore, there is no risk that the position of the tape pull-out pin will shift due to repeated tape loading and that the control signal reproduction during half zeroing will become unstable.

If there are modes other than stop, fast-winding, and playback to be set on the VTR, the following may occur.

For example, assume that there is a pause mode between the fast-winding mode and the playback mode, that is, the state shown in FIG. 3 is the pause mode. Then, the slide lever σ mark moves further in the direction of the arrow (A) to enter the playback mode (Fig. 7). In the reproduction mode, the tape is transferred by pressing the capsta 20 and the pinch roller σ3. In other words, the pinch roller α9 is not in contact with the capstan in the state shown in FIG.

In addition, in the state shown in FIG. 7, the pinch roller lever α is further rotated counterclockwise.

However, the tape drawer lever area is a rotary lever (211
Since the position is regulated by the locking plate Gυ, it is in the same position as in the half-loading state. In other words, the control R/P head α1) in the playback state (indicated by a broken line)
A nearby tape running path is also defined by the inside of the tape pull-out pin.

Therefore, by changing the position of the tape pull-out pin), the control R/P can be moved from the tape outlet of the guide cylinder (51)
The length of the tape (4) up to the head αυ will change. This means that mounting the control R/P head αυ is equivalent to changing its position. In other words, by adjusting the position of the locking plate (3υ), the control R/P head α
D position adjustment (Kta adjustment) becomes unnecessary.

Regarding the control R/P head, in addition to the above-mentioned X adjustment, height adjustment and azimuth adjustment are also performed.
By eliminating the need for iI&I adjustment, control R
/P The configuration of the head support means (which requires a 1M adjustment mechanism) can be simplified.

In each of the above modes, the main brake of the reel stand is released in the fast winding mode, and the drive of the reel stand is changed to slip drive in the playback mode. In pause mode, the pinch roller ■ and the capstan α are separated,
The mechanism is controlled by the position of the slide lever αe so that a brake is applied to the reel stand. Further, the tape pull-out pin θ is driven only immediately after the cassette is loaded.

Then, when it is necessary to release the restriction on the position of the tape pull-out pin ■, such as when taking out a cassette, the solenoid (to) is sucked, and the locking plate (9) is moved to release the restriction on the rotation lever (211). It is something that

Control of this solenoid can is performed by a mechanism control circuit. When performing half loading again, it is sufficient to move the slide lever (17) from the stop mode to a predetermined mode and then return to the stop mode.

(G) Effects of the invention Since malfunctions in reproduction can be prevented, the present invention is excellent as a half-loading device.

[Brief explanation of the drawing]

The drawings all relate to embodiments of the present invention, and FIG. 1, FIG. 2, FIG. 3, FIG. 4, FIG. 5, and FIG. 7 are plan views showing the main parts, and FIG. 6 is a plan view showing the main parts. FIG. Part...Slide lever (moving member), C31J...
Locking plate (regulating means).

Claims (1)

[Claims] (1) A half-loading device comprising a tape pull-out means that rotates and pulls out the tape in accordance with the movement of a movable member for mode control of a video tape recorder, and a regulating means that fixes the tape pull-out means at a predetermined position.