JPH0831063A - Tape loading device - Google Patents

Abstract

PURPOSE:To make boat parts thin by pressing the upper surface of a loading roller post in the direction toward the bottom surface by means of an elastic body made of a spring steel and limiting change in height. CONSTITUTION:Loading roller posts 10 and 11 are fixed by screwing female screw parts provided on the bottom surfaces thereof on the male screw parts of lock posts 105 and 106 erected in a boat 15. During an assembling process, hexagonal wrenches as adjusting jugs are inserted into hexagonal holes provide in the head parts of the loading roller posts 10 and 11, screwing parts with the male parts of the lock posts 105 and 106 are rotated and heights are adjusted. An elastic body 101 made of a stainless spring steel, etc., is fixed to the boat 15 by means of screw 103 and 104 while the head parts of the loading roller posts 10 and 11 are pressed in the direction toward the bottom surface by means of this elastic force. In order to eliminate the play of the screw part during height adjustment, it is nor necessary to provide a special member like a coil spring on the bottom parts of the loading roller posts 10 and 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape loading device in a magnetic recording / reproducing device.

[0002]

2. Description of the Related Art A conventional tape loading device will be described below.

FIG. 6 is a schematic structural view of a magnetic recording / reproducing apparatus having a conventional tape loading device.

In FIG. 6, 1 is a chassis, 2 is a tape cassette mounted on the chassis 1, and a supply reel 3 and a take-up reel 4 are arranged in the tape cassette 2. When the tape cassette 2 is mounted on the chassis 1, the supply side loading roller post 8, the tension post 9, the inclined post 16 and the winding side are provided in the notches 5, 6 and 7 formed in the front surface of the tape cassette 2. The loading roller posts 10 and 11, the pinch roller 12, and the auxiliary roller post 23 are inserted inside the magnetic tape 13, respectively.

Numerals 14 and 15 are boats on the supply side and the winding side, respectively. The boats 14 and 15 draw the magnetic tape 13 from the tape cassette 2 and attach it to the outer periphery of the rotary head cylinder 19 from the drawing position located inside the tape cassette 2 to the drawing position outside the tape cassette. The supply side boat 14 and the winding side boat 15 move.

Winding side loading roller posts 10 and 11 are attached to the winding side boat 15 via lock posts 105 and 106 as shown in FIG.
The supply side loading roller post 8 is attached to the supply side boat 14 as well as the winding side boat 15, and the inclined posts 16 are planted.

The magnetic tape 13 pulled out from the tape cassette 2 by the loading roller post and the inclined post passes through the capstan 20 supported by the bearing 21 from the audio control head 22 and the auxiliary roller post 23 on the winding side. The magnetic tape twist is corrected in the fixed inclined post 24 and converted to a normal horizontal traveling path, and then the reel 4 in the tape cassette 2 is taken up.

On the supply side, the fixed inclined post 2
The twist of the magnetic tape is corrected at 6, and after being converted to a normal horizontal traveling path, it passes through the tension post 9 to reach the supply reel 3 in the tape cassette 2.

Here, the state in which the winding-side loading roller posts 10 and 11 are attached will be described in detail.

As shown in FIG. 7, the winding side loading roller posts 10 and 11 are provided with screw parts provided on the lock posts 105 and 106 which are planted in the winding side boat 15, respectively. Is screwed into.

Reference numeral 107 denotes a screw, which is screwed into a screw hole penetrating from the take-up side boat 15 to the lock post 105 or 106, and biases the central axes of the take-up side loading roller posts 10 and 11 from the side surface to lock the lock. An appropriate frictional force is applied between the posts 105 and 106 and the central axes of the winding loading roller posts 10 and 11. This frictional force prevents the winding-side loading roller posts 10 and 11 from freely rotating around the center holes of the lock posts 105 and 106, and prevents the tape running height from changing.

In addition, the hexagon wrench 102 of the adjusting jig is
The winding side loading roller posts 10 and 11
7 is inserted into a hexagonal hole provided at one end of the magnetic tape in the direction of FIG. 7 and rotated to adjust the height of the winding-side loading roller posts 10 and 11 that regulate the running position of the tape. Is correctly attached to the rotary head cylinder 19.

FIG. 8 shows another conventional example, in which the winding-side loading roller posts 10 and 11 are urged by compression coil springs 108 and 109 in the directions of FIG. The backlash of the threaded portion of Fig. 8 is kept constant as shown in Fig. 8 to prevent the height change due to the backlash of the threaded portion of the winding side loading roller posts 10 and 11.

At the same time, by applying an appropriate frictional force to the winding-side loading roller posts 10 and 11, the winding-side loading roller posts 10 and 11 are provided.
Freely rotates about the center holes of the lock posts 105 and 106, and suppresses changes in the height of the loading roller posts 10 and 11 that regulate the position of the traveling magnetic tape.

Further, the height of the winding side loading roller posts 10 and 11 is adjusted by the hexagon wrench 102,
The magnetic tape is properly attached to the rotary head.

[0016]

However, in the conventional configuration of FIG. 7, it is necessary to provide the take-up boat 15 with a screw hole into which the screw 107 is screwed. Therefore, there is a limit to reducing the thickness of the take-up boat 15, and as a result, the dimension from the lower end of the magnetic tape to the lower end of the take-up boat 15 in FIG. 7 becomes large.

In addition, the structure of FIG. 8 of another conventional drawing also has the following problems. (1) That is, similar to the conventional example of FIG. 7, the winding side loading roller posts 10 and 11 and the winding side boat 1
Since it is necessary to insert an elastic body such as the compression coil spring 108 between the magnetic tape and the coil 5, there is a drawback that the dimension from the lower end of the magnetic tape to the lower end of the winding side boat 15 in FIG.

Although the winding side boat 15 has been described above, the same applies to the supply side boat 14.

(2) Further, in the conventional example of FIG. 8, compression coil springs 108 and 109 urge the winding-side loading roller posts 10 and 11 in the directions of FIG. The play of the threaded portion between them is kept constant in the state shown in FIG. 8 to prevent the change in height due to the play of the threaded portion of the winding side loading roller posts 10 and 11, but the direction of the thrust force by the hexagon wrench. When the height of the loading roller post is adjusted, the thrust force is applied when the hexagon wrench is inserted and rotated in the direction of Fig. 8 when the height of the loading roller post is adjusted. After adjustment, the compression coil spring returns to the service state by the urging force of the compression coil spring. Therefore, the height of the loading roller post that regulates the running position of the tape changes by the play of the screw during and after the adjustment, so that the magnetic tape is not accurately attached to the rotary head cylinder, which adversely affects the image and the like. There was a problem.

For example, the height change of the loading roller post due to the change from the state shown in FIG.
Even if it is about μm, the track width of the video tape is 58 μm to 19 μm. (In the NTSC system and VHS system, the former is the normal mode and the latter is 3
The value of the double mode) and the change of the height of the loading roller post that regulates the running position of the tape have a serious influence on the image quality and the like.

(3) Further, in the conventional example of FIG. 8, when the height of the loading roller post is adjusted, the backlash of the screw between the loading roller post and the lock post is urged by the thrust force generated by the hexagon wrench. The direction is opposite to the direction in which the play of the screw is biased by the biasing force of the elastic body. Therefore, in order to surely return the looseness of the screw from the thrust state of FIG. 8 during the height adjustment of the loading roller post to the adjusted thrust state, a relatively large spring urging force that overcomes the frictional force of the screw portion is applied. It had the necessary drawbacks.

The present invention solves the above problems, and an object of the present invention is to provide a tape loading device which realizes a thin and compact magnetic recording / reproducing device with high image quality.

[0023]

In order to solve the above-mentioned problems, a tape loading device of the present invention comprises a loading roller post having a threaded portion on the bottom surface, a boat having a threaded portion screwed into the threaded portion, and one end An elastic body coupled to the boat so as to restrain the upper surface of the loading roller post and to urge the loading roller post toward the bottom surface at the other end.

[0024]

According to the present invention having the above-described structure, the upper surface of the loading roller post is restrained by the elastic body and the height of the loading roller post is prevented from being changed by urging the loading roller post toward the bottom surface. The parts can be made thinner and smaller, and the size from the lower end of the magnetic tape to the lower end of the boat can be reduced.

Further, in the tape loading device of the present invention having the above structure, the direction of the loading roller post is biased when the height of the loading roller post is adjusted, and the looseness of the screw is biased by the biasing force of the elastic body. Since the directions are the same, the height of the loading roller post does not change due to the looseness of the screw during and after the adjustment.

Further, in the tape loading device of the present invention having the above-mentioned structure, the backlash of the screw is biased by the biasing direction of the loading roller post and the biasing force of the elastic body when the height of the loading roller post is adjusted. Since the directions are the same, it is not necessary to resist the frictional force of the screw part, and it is sufficient for the elastic body to have a force that urges the loading roller post in the direction of the screw part and maintains it in that state. The urging force of the elastic body can be set small.

[0027]

EXAMPLE An example of the present invention will be described below.

FIG. 1 is a schematic structural view of a magnetic recording / reproducing apparatus equipped with a tape loading apparatus according to an embodiment of the present invention,
2 is a perspective view of the loading roller post portion of the tape loading device, FIG. 3 is a front view of the roller post portion, and FIG. 4 (a) is a side view of the roller post portion as seen from the direction H in FIG. FIG. 4B is a side view of the roller post portion as viewed from the direction of T in FIG.

In FIG. 1, the configuration similar to the conventional one is shown in FIG.
The same reference numerals are given to omit detailed description.

In FIG. 1, 10 and 11 are loading roller posts, 101 is an elastic body, and each of the loading roller posts 10 and 11 has a lock post 105 in which a female screw portion provided on the bottom surface thereof is planted in a boat. And 106 are screwed and fixed to the male screw portions.

The loading roller post pulls out the magnetic tape and attaches it to the rotary head cylinder. The rotatable roller provided on the outer periphery of the loading roller post smoothly runs the magnetic tape, and the magnetic tape is guided along the tape guide of the rotary head cylinder. It plays an important role in regulating the running position of the magnetic tape so that the tape runs properly.

Further, as shown in FIG. 3, one end of the elastic body 101 restrains the heads of the loading roller posts 10 and 11, and one end of the elastic body 101 is elastically deformed from the two-dot chain line in FIG. 3 to the solid line state. The other end of the elastic body 101 is coupled to the boat 15 by a screw 103 so as to bias the head portion of the loading roller post toward the bottom surface.

For the elastic body 101, for example, a stainless spring steel material is used, and it is formed into a T shape as shown in FIG.

The biasing force of the elastic body 101 is as shown in FIGS.
Are shown as W ₁ , W ₂ , W ₃ and W ₄ . During manufacturing of the magnetic recording / reproducing apparatus, the magnetic tape 13 is correctly attached to the rotary head cylinder 19, and the loading roller posts 10 and 11 that regulate the running position of the tape in order to accurately run on the tape guide carved in the cylinder. Adjust the height of.

In this embodiment, the hexagonal wrench 102 of the adjusting jig is attached to the head of the loading roller post 10 or the like while the heads of the loading roller posts 10 and 11 are urged toward the bottom surface by the elastic body 101. By inserting into the provided hexagonal hole in the direction of c in FIG. 2 and rotating, the screw portion of the loading roller post and the screw portion of the boat rotate and the height of the loading roller post can be adjusted.

At this time, due to the thrust force when the hexagon wrench 102 is inserted into the hexagonal hole of the head of the loading roller post and rotated, the looseness of the screw part of the loading roller post and the lock post is shown in FIG. In this state, the looseness of the screw portion is held by the biasing force of the elastic body 101 toward the bottom surface in this state.

By the way, the urging forces W ₁ , W ₂ , W ₃ , and W ₄ generated by the elastic body 101 generate a rotational resistance force due to friction in the loading roller posts 10 and 11.

The torque T ₁ required to rotate the loading roller post 10 is shown below.

The loading roller post 1 generated between the elastic body 101 and the loading roller post 10.
The torque T ₂ required to rotate 0 is T ₂ = (W ₁ + W ₂ ) × μ ₁ × R (1) μ ₁ : elastic body 101 and loading roller post 10 from FIGS. 3 and 5.
It is the coefficient of friction that occurs between and.

The torque T ₃ required to rotate the loading roller post 10 generated in the screw portion between the loading roller post 10 and the lock post 105 is such that the load applied to the screw is (W ₁ + W ₂ ). Therefore, as is generally known from FIG. 3, T ₃ = (W ₁ + W ₂ ) × tan (θ ± φ) (2) θ = tan ⁻¹ (P / (π × d _e )) φ = tan ⁻¹ (μ ₂ / cos α) μ ₂ : The torque T ₁ required to rotate the loading roller post 10 due to the friction coefficient generated in the threaded portion between the loading roller post 10 and the lock post 105. From the above equations (1) and (2), T ₁ = T ₂ + T ₃ (3).

Further, the torque T ₄ required to rotate the winding-side loading roller post 11 is also calculated in the same manner as T ₁ .

That is, the urging forces W ₁ , W _{2 of the} elastic body 101
Alternatively, the spring strength of the elastic body is set so that the torque T ₁ due to W ₃ and W ₄ is greater than the torque applied by the tape sliding on the loading roller posts 10 and 11 and the torque generated by the impact applied to the loading mechanism. By setting, it is possible to prevent the height of the loading roller post from changing.

As described above, according to this embodiment, the upper surface of the loading roller post 10 or the like is restrained by the elastic body, and the loading roller post 10 or the like is urged toward the bottom surface to raise the height of the loading roller post 10 or the like. In order to prevent the change in the thickness, the parts of the boat 15 can be thinned and downsized, and the dimension from the lower end of the magnetic tape 13 to the lower end of the boat 15 can be reduced, and the magnetic recording / reproducing device can be thinned and downsized. Becomes

Further, according to this embodiment, the hexagon wrench 102 is adjusted when adjusting the height of the loading roller post 10 or the like.
The direction in which the screw between the loading roller post 10 and the like and the lock post 105 and the like is biased by the thrust force and the direction in which the backlash of the screw is biased by the biasing force of the elastic body 101 are the same, The height of the loading roller post 10 or the like does not change due to the looseness of the screw during and after the adjustment, and the height can be adjusted accurately.
It is possible to accurately run the tape guide on the tape guide and to perform high-quality magnetic recording and reproduction.

Further, according to this embodiment, the hexagon wrench 102 is used when adjusting the height of the loading roller post 10 or the like.
The direction in which the screw between the loading roller post 10 and the like and the lock post 105 and the like is biased by the thrust force and the direction in which the backlash of the screw is biased by the biasing force of the elastic body 101 are the same, As the urging force of the elastic body 101, it is sufficient if there is a force for holding the backlash of the screw portion in the slanted state of FIG. 3, and the urging force of the elastic body can be set to a small value. It is possible to improve efficiency, improve work efficiency, and reduce parts cost.

Even when a plurality of loading roller posts 10 and 11 are attached to the boat 15 as in this embodiment, one elastic body 101 can urge all the loading roller posts 10 and 11. It is possible to realize a tape loading device having a simple structure with a small number of parts.

In this embodiment, as shown in FIGS. 2 and 3, the screw 10 is used as a coupling means for the elastic body and the boat.
However, according to the present embodiment as described above, since the elastic body needs only a small biasing force to be applied to the roller post, the claw 1 protruding from the boat as shown in FIG. 5 is used.
Sufficient biasing force can be obtained by providing the elastic body with the hole 111 to be coupled with the claw 110, and a thin tape loading device with an extremely simple structure, and thus a thin, compact and high-quality magnetic field. A recording / reproducing apparatus can be realized.

[0048]

As described above, according to the present invention, the height of the loading roller post is changed by restraining the upper surface of the loading roller post by the elastic body and urging the loading roller post toward the bottom surface. In order to prevent this, the boat parts can be made thinner and smaller, the size from the lower end of the magnetic tape to the lower end of the boat can be made smaller, and the tape loading device can be made thinner and smaller.

Further, according to the present invention, the direction in which the loading roller post is urged when adjusting the height of the loading roller post and the direction in which the backlash of the screw is urged by the urging force of the elastic body are the same direction. As a result, the height of the loading roller post does not change due to looseness of the screw during and after adjustment, and accurate height adjustment can be performed, and the magnetic tape can be accurately placed on the tape guide of the rotary head cylinder. It is possible to realize a high quality magnetic recording / reproducing device by running the magnetic recording / reproducing device.

Further, according to the present invention, the direction in which the loading roller post is biased when adjusting the height of the loading roller post is the same as the direction in which the backlash of the screw is biased by the biasing force of the elastic body. It is not necessary to resist the frictional force of the screw part, and as the urging force of the elastic body, it is sufficient if there is a force that urges the loading roller post in the direction of the screw part and holds it in that state. The size can be set small, and the structure of the tape loading device can be simplified, the assembly can be facilitated, the work efficiency can be improved, and the cost of parts can be reduced.

[Brief description of drawings]

FIG. 1 is a schematic structural view of a magnetic recording / reproducing apparatus equipped with a tape loading device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a loading roller post portion of the tape loading device.

FIG. 3 is a front view of the loading roller post section.

FIG. 4 is a side view of the loading roller post section.

FIG. 5 is a perspective view of a loading roller post portion of the tape loading device according to the second embodiment of the present invention.

FIG. 6 is a schematic structural diagram of a magnetic recording / reproducing device including a conventional tape loading device.

FIG. 7 is a side view of a loading roller post portion of the tape loading device.

FIG. 8 is a front view of a loading roller post portion of a conventional tape loading device.

[Explanation of symbols]

 8 Supply Side Loading Roller Post 10,11 Winding Side Loading Roller Post 13 Magnetic Tape 14 Supply Side Boat 15 Winding Side Boat 19 Rotating Head Cylinder 101 Elastic Body 105,106 Rock Post

Claims (1)

[Claims] 1. A tape loading device in which a magnetic tape is attached to the periphery of a rotary head cylinder, a loading roller post having a threaded portion on a bottom surface, a boat having a threaded portion screwed to the threaded portion, and one end of the boat A tape loading device, comprising: an elastic body coupled to the boat so as to restrain an upper surface of the loading roller post and urge the other end of the loading roller post toward the bottom surface.