JPH03141069A - Tape stretcher - Google Patents

Abstract

PURPOSE:To prevent a tape from being damaged by a lead of a drum at the time of loading by moving one pair of tape moving bodies in changing specifically their posture with guide bodies respectively. CONSTITUTION:One pair of the moving bodies 11 and 13 equipped with tape guides and slant pins 9, 10 and 5, 14 are moved respectively in engaging the guide bodies 29 and 30 corresponding to guide pins with guide grooves 31 and 32 respectively. Then, the three-dimensional posture of the moving bodies 11 and 13 controlled, and the tape 28 of a cassette 27 is wrapped around the rotary drum 12 along the lead of the drum 12. Consequently, the tape is prevented from being damaged by the lead of the rotary drum at the time of loading, thus stretching the tape satisfactorily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tape loading device used in a video tape recorder or the like.

[Conventional technology]

In a cassette type recording and reproducing apparatus such as a video tape recorder, when a tape cassette is attached, the tape in the cassette is pulled out to a predetermined position and wound around a drum, and the tape is run in this state.

The drum, which is provided locally with a head for recording information on the tape and reproducing information recorded on the tape, is provided at an angle with respect to the plane on which the tape cassette is arranged.

When winding a tape around such an inclined drum, the tape is pulled out by a tape guide, and the movement path of this tape guide is such that the tape pull-out member that supports it and this tape pull-out member slide together. It is uniquely determined by the guide body.

Conventionally, the sliding surface of the guide body with the tape pull-out member is a non-flat cam surface, and by sliding the tape pull-out member along the guide body, the attitude of the tape guide is adjusted, and the tape is A tape mounting device that is designed to prevent the tape from falling off the guide is known. This is JP-A-63-2
It is disclosed in Japanese Patent No. 09055.

[Problem to be solved by the invention]

The above-mentioned prior art is preferable in that it controls the winding and storage of the tape while changing the posture of the tape guide so that the tape does not fall off the tape guide, and can reduce damage to the tape.

By the way, in order to realize the need to increase the recording time (or playback time) by 8 times, the thickness of the tape itself tends to become thinner and thinner.

However, when the tape thickness becomes thinner, the tape strength decreases extremely. FIG. 14 shows the relationship between the tape strength ratio and the recording time ratio when the tape strength is 1 when the tape thickness is 20 μm. As you can see from this figure, if the tape thickness is made thinner, the recording time will be longer, but the tape strength will be extremely reduced. As shown in FIG. 15, during winding, there is a high possibility that the tape will ride on the lead of the drum and be damaged, or that the tape edge will be pressed against the lead side and buckle, causing the tape to break.

SUMMARY OF THE INVENTION An object of the present invention is to provide a tape mounting device that can prevent the tape from being damaged by the lead of the drum when the tape is mounted on the drum.

(Means for Solving Problem II) In order to achieve the above object, a tape loading device of the present invention has the following features:
A rotatable drum having a lead on the outer periphery for guiding the tape, a pair of tape guides for pulling out the tape from the tape cassette and winding it around the drum, a pair of tape drawer moving bodies each supporting the tape guides, and a winder. A pair of guide bodies are provided for guiding the pair of tape guides while controlling the postures of the pair of tape guides so that the edge of the tape always follows the lead of the drum as the attachment progresses.

Further, the tape loading device of the present invention includes a drum having a lead on its outer periphery, a head provided on the drum for recording or reproducing information on the tape, and a tape that is pulled out from a tape cassette and wound around the drum.

and a pair of tape guides for storing the tape wound around the drum in a tape cassette, a pair of tape drawer moving bodies supporting the tape guides, and a pair of tape drawer moving bodies.

The posture of the tape guide is maintained approximately at the posture before the tape is drawn out from when the tape starts to be drawn until a part of the tape comes into contact with the drum, and then as the wrapping angle of the tape around the drum increases, the tape guide comes into contact with the drum. and a pair of guide bodies each having a sliding surface with respect to the tape drawer moving body so that the tape edge of the portion of the tape along the lead of the drum is formed.

Further, the tape mounting device of the present invention includes a rotatable drum having a lead, a head provided locally on the drum for recording information on the tape pulled out from the tape cassette, and reproducing the recorded information. A pair of tape guides for taking tape from a tape cassette and winding it around a drawer drum, a pair of tape drawer moving bodies supporting each of the tape guides, and adjusting the posture of the pair of tape guides as the winding progresses. A pair of guide bodies that control and guide each edge so that it always follows the lead of the drum.

It has a pair of movable correction guides that move while contacting the tape in conjunction with the movement of the tape guide during the tape drawing process, and control the tape wrapping angle around the tape guide.

[Effect]

The tape drawer moving body moves while being guided on the guide body while supporting the tape guide.

As a result, the tape is pulled out from the tape cassette while being pulled by the tape guide. When the tape is pulled out to a position where it contacts the drum, the tape guide guides the tape while changing its height and inclination so that the edge of the tape follows the lead provided on the drum. That is,
When the tape drawer moving body that supports the tape guide moves along the guide body, the tape drawer moving body moves while changing its attitude, and the tape guide moves together with an attitude corresponding to the movement, The guide body that winds the tape around the drum has a guide path formed in advance with the tape drawer moving body so that the tape guide is positioned so that the edge of the tape follows the lead of the drum while winding progresses. This eliminates problems such as the tape riding on the lead during winding.

〔Example〕

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

FIG. 1 is a plan view of a cassette-type magnetic recording and reproducing apparatus according to an embodiment of the present invention, showing a state in which the tape is pulled out. The tape 28 is wound around the rolls 1 and 26 within the cassette 27. inside the cassette.

Pins 2 and 25 are arranged. Further, the reproducing apparatus is rotatably provided with a drum 12 to which a head (not shown) for recording and reproducing information is attached. and,
In order to wind the tape 28 around this drum 12, tape guides 9, 15 are arranged on the tape drawer carriage 11.13. In addition, each of the movable bodies has tilt bins 10 and 10.
．． 14 are arranged and move together with the tape guide. Further, in synchronization with the movement of the tape guides 9 and 15, the movable correction guide 6.18 moves in such a manner as to press the tape 28 from the side opposite to the tape drawing direction. Further, in order to bring the tape 28 into contact with the capstan 21, the tape pull-out posts 4.23 are arranged to move and pull out the tape to both sides. Furthermore, the pinch roller 22 moves together with the tape pull-out post 23, and when the tape loading is completed, the tape 28 is attached to the capstan 21.
The structure is such that it can be crimped. Also, erase head 8
．． A fixing pin 7.degree. 17 for wrapping the tape 28 around the audio head 16 at a predetermined angle, and other fixing pins 3, 20, and 24 are arranged. Furthermore, fixed tilt guides 5 and 19 are arranged to further correct the tilt of the tape.

Furthermore, guide bodies 29 and 30 are arranged on both sides of the one-rotation drum 12, as shown in FIG.

The guide body is provided with guide grooves 31,32.

When the guide body 30 shown in FIG. 2 is viewed from the side, it is as shown in FIG. 3. In other words, the initial position of the drawer! As the drawer advances from the bottom in Figure 3, it bends downward and then upward again. In addition, Fig. 4 shows the state of the cross section from point A to D of the guide body 30 in Fig. 2, which was parallel at point A, tilted to the right at point B, and became parallel again at point 0. , and at point D it tilts to the left. The guide body 29 is also configured to curve in the vertical direction and incline to the left or right at each part, the details of which will be described later.

Further, the tape drawer moving bodies 11 and 13 have a similar structure, as shown in FIGS. 5 and 6. Here, the moving body 13 is shown, and the moving body 13 has a slider 3.
6.34 is formed, and 36 is the surface 3 of the guide body 30.
0-a section, and 34 slides on the back surface 30-b section of the guide body 30. Further, since the tape pull-out moving body 13 moves along the guide groove 32 of the guide body 30, a guide pin 33.35 is arranged on the lower surface of the tape pull-out moving body 11.13, and in this example, the slider 34 is , are arranged on the guide pin 33.

Next, the operation of this embodiment will be explained.

Before the tape is pulled out, the tape 28 is attached to pin 2.25 in Figure 1.
There are tape guides 9, 15, . . . on the inside of this tape. A tilt bin 10.14, tape drawer posts 4, 23, and a pinch roller 22 are arranged. Then, as the tape is drawn out, the tape is drawn out in the state indicated by symbols abcd in the figure. That is, when the tape 28 is moved to the position indicated by the symbol.

It begins to wrap around the rotating drum 12 slightly. At the same time, the movable correction guide 6.18 begins to contact the tape from the outside in the tape withdrawal direction.

Furthermore, the state indicated by symbol C is a state in which the tape has been drawn out. The state indicated by symbol d is a state in which tape drawing is completed. At this point, the movable correction guide 6.18 is completely separated from the tape 28.

As shown in FIG. 7, the drum 12 consists of a rotating drum 12a and a stationary drum 12b, and the stationary drum 12b has a lead 38 formed with a step for guiding the tape 28. By winding the tape along the lead 38, highly accurate tape positioning is possible, and damage to the tape at the stepped portion of the lead 38 can be prevented. Therefore, when drawing out the tape, it is necessary to control the position of the tape so that it follows the lead 38. That is, when the tape 28 comes into contact with the drum 12, the tape guide 9.15 changes its position so that the lower edge of the tape is along the lead of the drum, as shown in FIG. As the angle increases, the attitude of the tape guide is controlled as shown in FIG. 13 so that the tape edge always follows the drum lead during the winding process. In addition, Figures 12 and 13
The shaded portion of the tape in the figure represents the contact portion with the drum. In this embodiment, the height and inclination of the tape guides 9 and 15 are changed, and at the same time, the tape height is controlled by a movable correction guide so that the tape is pulled out along the lead.

Changing the tape guide posture when drawing out the tape is done by the following configuration, namely, the guide bodies 29 and 30.
As shown in FIGS. 2 to 4, as the tape is pulled out, its height and inclination to the left and right change. Therefore, the attitude of the moving body sliding on it also changes accordingly. Since the tape guide 9 and the inclined pin 1° are fixed on the movable body 11, their postures change according to the change in posture accompanying the movement of the movable body 11 sliding on the guide body. Similarly, the postures of the tape guide 15 and the inclined pin 14 also change depending on the posture of the movable body 13 at each position on the guide body 3o. In this case, the postures of both tape guides are changed so that the edge of the tape follows the lead 38 of the drum 12.

FIGS. 8 to 10 specifically show the posture of the tape guide that winds the tape so that the edge of the tape is aligned with the lead of the drum. That is, FIG. 8 shows how the height of the tape guides changes at each position during the process of pulling out the tape guides 9 and 15. Here, each position in the drawing process is expressed as a winding angle of the tape around the drum. Further, FIG. 9 shows the state in which the tape guides 9 and 15 are tilted forward and backward, and FIG. 1O further shows the state in which they are tilted left and right. In FIGS. 8 to 10, the state of the tape guide 9 is shown by a constant chain line, and the state of the tape guide 15 is shown by a solid line.

As can be seen from FIG. 8, the tape guide 9 does not change its height from the position where the cassette tape is stored to the position where the tape comes into contact with the drum. 9 maintains a state in which there is no inclination to the front or back or to the left or right. This is shown in Figure 9.

This is clear from FIG. The tape guide 9 gradually increases its height as the winding progresses after the tape starts contacting the drum. At the point where the wrapping angle is about half of the wrapping angle at the end of the mounting, it starts to descend, and then it rapidly descends to the end of the wrapping. Further, when the tape guide 9 is displaced in the height direction, the inclination also changes greatly. That is, as can be seen from FIGS. 9 and 10, the backward inclination increases as the winding progresses after the tape starts contacting the drum. Then, from a certain point, the backward inclination is gradually changed to a forward inclination, and the control is performed so that it finally becomes a forward inclination. When inclining in the left-right direction, the inclination to the right is initially increased, the inclination gradually becomes to the left in the middle, and finally the inclination is to the left.

On the other hand, the height of the tape guide 15 is changed as shown in FIG. In other words, the tape guide 15 has the same height as the other tape guides 9 until the tape contacts the drum by changing its height. After that, the tape guide 15 is controlled so that its height gradually decreases from the position where the tape contacts the drum 12, contrary to the tape guide 9, and starts to rise from a further advanced position, and finally begins to draw out the tape. The tape winding is completed at a higher position than before.

As can be seen from FIG. 9, the inclination in the front and back direction during the movement process of the tape guide 15 when drawing out the tape is not tilted in the front and back direction until the tape comes into contact with the drum, and the tape starts to contact the drum. When it reaches the drum wrapping area, it slopes sharply forward. Thereafter, the forward inclination changes to decrease, and the winding is completed in the backward inclination state. In addition, as shown in Fig. 10, the tape guide 15 does not incline in the left-right direction during the movement process. There is no inclination until the tape contacts the drum, and then it inclines to the right as winding progresses, and then to the left. It becomes a slope,
In the final stage, the slope to the left is increased further. This position of the tape guide allows the tape to be guided to the drum under the conditions that the edge of the tape follows the lead of the drum and the tape is stretched between posts, etc., so that no twisting occurs. This can be determined by calculation from the winding angle of the tape guide, the winding angle of the tape guide, the movable correction guide, and the relative positional relationship with the reel. The angle of separation is controlled to be approximately perpendicular to the axis of the guide. Thereby, even if the tape runs on the tape guide during tape withdrawal, displacement of the tape in the width direction can be suppressed to a minimum. That is, it is possible to prevent the edge of the tape from moving toward the flanges on the upper and lower sides of the guide for preventing the tape from falling off, causing the tape to break, or from climbing over the flange portions and damaging the tape.

In this way, by pulling out the tape while changing the height and posture of the tape guide, the tape position on the tape guide can be positioned at the center of the tape guide with high precision. 1st
FIG. 1 shows the tape height at the other posts of the tape guide when the tape guide is approximately close to position C in FIG. The broken line indicates the tape deviation when the tape guide is pulled out in the same state as the initial state without controlling the attitude of the tape guide. The solid line is
This is when the attitude of the tape guide is controlled.

If the posture of the tape guide is not controlled, the tape will deviate significantly from the tape guide, which may easily cause damage to the tape or the tape falling off the guide.
By controlling the posture, the tape runs in the center of the tape guide, resulting in a highly accurate tape guiding device.

In this embodiment, as shown in FIGS. 5 and 6, the guide body 30 is held between sliders 36 and 34 from both sides. Therefore, when drawing out the tape, tape tension T acts on the tape guide 15 and tries to tilt the tape drawing moving body in the direction of arrow E. However, since the slider 34 and 36 are positioned, the shape of the guide body 30 is guided with high precision. Also.

For example, a spring member 37 is provided at a position facing 34 so that the posture of the tape guide 15 can be maintained even when the tension T is small.

With this structure, the tape drawer moving body can be positioned with a light clamping force, the movement of the moving body is stabilized, and the positioning accuracy is improved.

〔Effect of the invention〕

According to the present invention, during the tape drawing process or tape storage process, the tape drawn out by the tape guide is held in an optimal three-dimensional state so that its edge follows the lead of the drum, thereby preventing damage to the tape. It can run stably even with thin tape.

[Brief explanation of the drawing]

FIG. 1 is a plan view of an embodiment of the present invention, FIGS. 2 to 4 are diagrams for explaining the guide body, and FIGS. 5 and 6 are side and front views of the tape drawer moving body, respectively. , FIG. 7 is a front view of the drum, FIGS. 8 to 10 are attitude state diagrams showing the amount of attitude change of the tape guide, and FIG. 11 is a diagram showing the tape height at posts. FIG. 12 and FIG. 13 are diagrams for explaining the state of tape winding in one embodiment of the present invention. FIG. 14 is a diagram showing the relationship between tape thickness and tape strength and the relationship between tape thickness and recording time. FIG. 15 is a diagram for explaining the problems of the conventional tape guide device. 1.26...Reel, 4,23...Tape drawer post, 6,18...Movable correction guide, 9,15...
・Tape guide, 10.14... Inclined pin 1.11.
13...Tape drawer moving body, 12...Drum, 2
8... Tape, 30... Guide body, 33.35...
Guide pin, depth 1 Fig. 1

Claims (1)

[Claims] 1. A rotatable drum around which a tape is wound along a lead provided on its outer periphery; a pair of tape guides for pulling out the tape from a tape cassette and winding it around the drum; a pair of tape drawer moving bodies each supporting a tape guide, and guiding the pair of tape guides while controlling the posture of the pair of tape guides as winding progresses so that the edge of the tape always follows the lead of the drum. A tape loading device having a pair of guide bodies. 2. A rotatable drum around which a tape is wound around a lead provided on the outer periphery; a head installed on the drum for recording or reproducing information on the tape; and a head for pulling out the tape from a tape cassette and winding it around the drum. a pair of tape guides for attaching the tape and storing the tape wound around the drum in the tape cassette; a pair of tape drawer moving bodies each supporting the tape guides; and a pair of tape drawers. The moving bodies are each guided, and the posture of the tape guide is maintained approximately at the posture before the tape is pulled out from the start of pulling out the tape until a part of the tape comes into contact with the drum, and then the tape guide is kept in the same position as before the tape is pulled out. As the wrapping angle increases, the sliding surface with the pair of tape drawer moving bodies is formed such that the edge of the tape in the portion of the tape in contact with the drum follows the lead of the drum. A tape mounting device having a pair of guide bodies. 3. A rotatable drum having a lead; a head provided around the drum for recording information on the tape pulled out from the tape cassette and reproducing the recorded information; a pair of tape guides for winding the drawer drum; a pair of tape drawer moving bodies supporting the tape guides; a pair of guide bodies that always control and guide the drum along the leads; and a pair of guide bodies that move while contacting the tape in conjunction with the movement of the pair of tape guides in the process of drawing out the tape, A tape mounting device that includes a pair of movable correction guides that control the angle at which the tape is wrapped around the guide. 4. A drum having a lead on its outer periphery that regulates the vertical position when the tape is running, a head that rotates around the center of the drum and records or reproduces information on the tape, and a drum that stores the tape. a tape guide that pulls out a tape from a cassette and stores the tape in the cassette; a movable correction guide that corrects the angle at which the tape is wrapped around the tape guide; and a movable correction guide that supports the tape guide and moves the tape guide. In the tape mounting device, the tape mounting device includes a tape drawer moving body that moves the tape drawer moving body, and a guide body that slides and guides the tape drawer moving body, the guide body changing the attitude of the tape guide from the start of tape drawing to the position of the tape. The tape is kept roughly in the same position as before the tape is pulled out until the tape starts to wrap around the drum, and then, in the process of increasing the winding angle of the tape around the drum, the edge of the tape always touches the lead of the drum. A tape loading device characterized by having a sliding surface with the tape drawer moving body that is controlled so as to follow. 5. The tape mounting device according to claim 4, wherein the tape drawer moving body has a structure in which it slides by holding sliding surfaces provided on both the front and back surfaces of the guide body. mounting equipment. 6. A rotatable drum having a lead, a pair of tape guides for pulling out the tape from a cassette storing the tape, and an angle of incidence and an angle of departure of the tape from the tape guide to approximately zero. a pair of first movable correction guides that perform correction in conjunction with the movement of the tape guide; a pair of tape drawer moving bodies that support and move the tape guide; and both sides of the drum. and has a sliding surface that slides on the movable correction guide, and the sliding surface controls the attitude of the pair of tape guides so that the edge of the tape always follows the lead of the drum. 1. A tape mounting device comprising: a pair of guide bodies formed in the first movable correction guide; and a pair of second movable correction guides that correct a tape wrapping angle around the first movable correction guide.