JPS6331058A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To attain the quick feeding and the rewinding while a traveling load is light and a tape is wound to a head drum by having a tape traveling bus formed so that an intersection line formed by the tape wound to a cassette and an orthogonal plane can be located near the tape sending point of a head drum and can pass through the outside of the head drum, at a tape sending side from the head drum. CONSTITUTION:The rotary shaft of a head drum 6 is inclined 7 approximately in the direction of two supplying side reels, the shaft is provided so as to be a little lower than the lower edge of a tape 2 of a cassette storing condition at the point where the height of a tape guiding lead is nearest a cassette 1, and the inclining angle of the rotary shaft of the head drum 6 is constituted to be a little larger than the inclining angle of a video track recorded on a tape 21. Further, at the tape supplying side to the head drum 6, an intersection 22 formed by the plane orthogonal to a tape supplied from the cassette and the plane orthogonal to the tape entering a head drum is formed so as to approximately parallel to the front surface of the cassette 1, and at the tape sending side, an intersection 23 formed by the plane orthogonal to the tape sent from the head drum 6 and the plane orthogonal to the tape wound to the cassette passes through the outside of the head drum 6.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a parallel two-reel cassette type magnetic recording and reproducing apparatus.

Conventional technology Conventional tape running methods can be broadly classified into the following four types.

(1) The tape fed from the cassette is fed to the head drum at the same height without being twisted, and the tape height difference and twisting are absorbed in the tape path from the head drum's delivery point to the take-up reel. Loading.

(2) Add a twist to the tape supplied from the cassette, change the running height, and supply it to the head drum, giving the tape a height difference and twist in the tape path from the head drum delivery point to the take-up reel. No, so-called new U loading.

(3) The tape supplied from the cassette is not subjected to any height difference or twist, but is supplied to the head drum with a height difference or twist applied near the tape supply point to the head drum; This is so-called M loading, which absorbs torsion and sends it to the take-up reel stand.

(4) Applying various height differences and twists to the power pit supply side tape and supplying it to the head drum, applying various height differences and twists to the tape from the sending point of the head drum, and returning it to the take-up reel stand.
So-called movie-style loading.

The advantages and disadvantages of methods (1) to (4) will be described below, but as is well known, when changing the running surface of the tape,
It is necessary to arrange the inclined boss 1 so that the tape entrance angle and the tape delivery angle are equal to each other on a line of intersection formed by two surfaces perpendicular to the tape. Furthermore, since the inclined post cannot theoretically be formed by a rotating roller, a traveling path in which the total value of the wrap angle around the inclined post is large has the disadvantage that the regular load of the tape is large.

Method (1) is a method used in stationary tapes that use beta cassettes, and has the advantage that the angle of winding around the inclined post used for twisting the tape is small and the running load can be reduced. The disadvantage is that the tape sent out from the head drum has a large downward angle, so if a path is formed that touches the audio drum or capstan, the overall thickness of the deck increases, and the cassette Since the reciprocating path of the tape is formed on the rear side of the head drum when viewed from the side, the overall plane of the deck becomes large.
There are limits to miniaturization, making it unsuitable for portable decks.

Method (2) was developed to reduce the drawback of method (1) that it is not suitable for miniaturization.
(Beta) Cassette portapull tilt and 8mm VTR
has been adopted. The advantage is that the torsion is absorbed on the tape supply side, so after the tape comes out of the cassette, it is twisted upwards and fed to the head drum. A path is formed and the thickness of the deck can be made smaller than in the U loading method of method (1). The disadvantages are that the number of guide posts increases logically to form such a path, resulting in a complicated mechanism, and that the rear side of the head drum when viewed from the cassette side Since the reciprocating path of the tape is still formed in , the method is inferior to method A5 in (3) and the method according to the present invention in terms of miniaturization of the entire deck.

Method (3) is VT using a V)-IS cassette.
The advantage of this method is that the tape guide is perpendicular to the chassis, and the mechanism is easy to configure.
Since there are fewer changes in the running of the tape in the vertical direction, the thickness of the deck can be made smaller than in methods (1) and (2). The disadvantage is that the winding around the inclined post has a large corner and therefore the running load is large, so it is not suitable for VTRs that require fast forwarding and rewinding while being wound around the head drum.

The method (4) is a method used in so-called camera-integrated VTRs, and focuses on miniaturization. The advantage is that the area occupied by the tape path can be designed compactly by adding various twists to the tape. The disadvantage is that the tape has a large twist, so the total value of the winding angle around the tilted position becomes very large, making it completely unsuitable for VTRs that require fast forwarding and rewinding while being wound around the head drum. do not have.

Problems to be solved by the invention If we try to miniaturize the deck as described above (3),
Method f4) is superior, and methods (1) and (2) are superior when trying to reduce the tape load.

The present invention makes the thickness of the deck smaller by setting the arrangement, angle of inclination, and direction of inclination of the head drum to values based on ideas different from conventional ones, making it possible to design the deck compactly, and making it possible to wrap it around an inclined post. The purpose of the present invention is to provide a magnetic recording/reproduction system in which the total value of the angle is very small, the running load is light, and the tape can be fast-forwarded and rewound while being wound around the head drum.

Means for Solving the Problems In the magnetic recording/reproducing apparatus of the present invention, the rotation axis of the head drum is tilted approximately toward the supply side reel stand, and the height of the tape guide lead provided on the head drum is closest to the cassette. The head drum is arranged such that its point is slightly lower than the bottom edge of the tape when it is stored in the cassette, and the tilt angle of the rotation axis of the head drum is slightly larger than the tilt angle of the video track recorded on the tape. On the tape supply side to the head drum, an intersection line formed by a plane perpendicular to the tape supplied from the cassette and a plane perpendicular to the tape entering the head drum is located near the tape supply port of the cassette. 114. Located on the head drum side when viewed from the cassette, formed at a small angle with the front surface of the cassette and almost parallel to the front surface of the cassette, and on the tape delivery side from the head drum, perpendicular to the tape delivered from the head drum. The intersection line formed by the plane and the plane perpendicular to the tape wound on the cassette is near the tape delivery point of the head drum and has a tape running path formed to pass outside the head drum. Features.

Function: Because of this configuration, (1) the tape does not pass through the rear side of the head drum when viewed from the cassette;

◎Since the head drum is tilted so that it almost faces the supply reel, there is little twisting of the tape in the vertical direction.

■On the supply side, where the twist is large, the guide post that pulls out the tape from the cassette is placed near the line of intersection formed by two planes perpendicular to the tape, so the corners are small when wrapping around the slanted post on the supply side. Become.

On the 0-winding side, the intersection line formed by the two planes perpendicular to the tape passes near the delivery point of one head drum, and by providing a guide post, the angle of approach to the inclined post is reduced.

Example Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 shows the running system of the magnetic recording/reproducing apparatus of the present invention, and FIG. 2 shows that the tape 24 has vA! It does not show how it is twisted using i-bost 25. FIG. 3 is a cross-sectional view of FIG. 2 at the tape center, where the tape 26 entering the inclined post 25 and the tape 27 being sent out intersect at the same angle as filQ28.
The profit I (α + β) of both corners indicates that the winding around the inclined post is a corner.

The configuration of FIG. 1 will be explained in detail. 1 is a cassette.

The diameter of the head drum 6 is 76 (lIn), the lead angle is 4.25°, and the tape winding angle around the head drum 6 is 216° because it is compatible with audio PCM. The rotating shaft 7 of the head drum 6 is almost connected to the supply reel stand 2.
When tilting in the direction of [252° in this example] at 5°, which is slightly larger than the lead angle, the supply tape passes near the feed-out post 4 of the cassette 1, and the head drum 6
On the winding side, an intersection line 22 parallel to the cassette 114 surface 1', which does not form the cassette front surface 1' and has a small angle, is generated, and on the winding side, it passes near the sending point of the head drum 6 and crosses the outside of the head drum 6. An intersection filGJ23 occurs.

Further, the height of the lead provided on the head drum 6 is 0.11 (in) lower than the lower end of 1-121 in the cassette 1 at the point where the head drum is closest to the cassette 1.

8 is a rotating guide roller, and when the cassette is stored, 8'
The guide roller 10 has a large diameter and rotates around 8" as a fulcrum to near the intersection line 22 on the supply side, reducing the angle of approach to the inclined post 9. 10 is a guide roller with a large diameter, which wraps around 80 degrees. Since the corners are turned to the right and the tape has the property of having little slippage, it has characteristics that can be used to determine the running speed and direction of the tape.

Reference numeral 11 denotes an erase head, which performs a pendulum motion about 11' during loading. 12 is the head drum 6 on the supply side
This is a roller post that determines the winding on the cassette, and is located at the 12' position when the cassette is stored. The center point 6'' for winding the tape around the head drum 6 is set 5 degrees counterclockwise from the point 6' closest to the cassette.

On the tape winding side, if a guide roller 13 is provided that determines the winding angle to the head drum 6, since the cross line 23 on the winding side passes near this guide roller 13, the approach angle to the inclined post 14 will be becomes smaller. The guide roller 13 and the inclined post 14 are 13' when stored in the cassette 1,
located at ill'. Further, 13 and 14 are provided on one piece body. 15 is the direction change day - arm, voice'? l! Winding is provided to the five-person head 16 and the audio recording/reproducing head 17. Further, the direction changing roller 15 rotates around the fulcrum 15' during loading. 18 is a 11↑I bustan, which is pressed against the pinch roller 20 to drive the tape and determine the tape feeding speed during recording and playback.

However, in the fast forwarding and rewinding states, the pinch roller 20 separates from the key ↑ knob stun 18, and the tape runs by the driving force of the reel 2.3.

Reference numeral 19 denotes a guide roller, which is located at 19' when the cassette is housed and rotates about 19'' as a fulcrum.Pinch roller 20 is at 20' when the cassette is housed and rotates about 20'' as a fulcrum.

The design specifications are not listed here. Note that the angles in the table are 0° from the center of the supply reel 2 toward the take-up reel 3, ``+'' in the counterclockwise a1 direction, and ``-'' in the clockwise direction.

(Left below) Guide post specifications diameter - φ76, lead angle -4,25°, winding angle = 216
With this configuration, (1) the tape does not run behind the head drum when viewed from the cassette, making it possible to reduce the size.

(2) Posts 12, 13, and 14 are the only ones that do not perform a simple rotation 1111 operation to bring each post into a tape running state, and posts 13, 14 are constructed on rigid members, and are substantially 2 Only book posts. For this reason, the mechanism is made of 111 parts, resulting in a mechanism with a small number of parts and therefore a low cost.

(3) Among the guide rollers constituting this running system, there is a roller 10 that can be designed to have a large diameter and a large wrapping angle, and this roller 10 is located outside the tape loop. Therefore, the roller 10 could be used to detect the speed of the tape and determine the running direction. This is because there is very little slippage with the tape. In the conventional method, providing a large diameter roller with a large wrap angle makes the mechanism difficult and complicated.

(4) It is obvious that the deep running system of the movie one-way type has a large load, so we actually tested the three conventional systems of U loading, prayer loading 1, and M loading and the running system according to the present invention. The table below does not show the calculated comparative data. In order to meet the conditions here, the diameter of the head drum, the winding angle and the lead angle are the same, and since the winding value of the erase head, audio erasing head, audio recording/playback head, etc. is constant regardless of the method, the slope is The load was determined by the angle of wrap around the post.

Determine the size of the load as shown in the table above. It is shown that the wrapping angle on the inclined post is very small, and the difference in tape center height that determines the thickness of the deck, that is, the difference between the maximum tape height and the minimum tape height, is very small.

(5) In this embodiment, since the tape path does not change due to the pressure contact of the pinch roller to the capstan/MI81I interference, there is no tape vibration in the control head, resulting in a mechanism with good editing accuracy.

According to the magnetic recording and reproducing apparatus of the present invention as described in detail,
The following effects can be obtained.

Since the tape does not pass behind the head drum when viewed from the O cassette, it can be made smaller.

Since the O-head drum is tilted so as to almost face the supply reel, there is less twisting of the tape in the vertical direction, and the tape can be made thinner.

On the supply side, where the twist is large, the guide post for pulling out the tape from the cassette is placed near the line of intersection formed by two planes perpendicular to the tape, so the angle can be made smaller when wrapping around the inclined post on the supply side.

On the 0 winding side, the line of intersection formed by the two planes perpendicular to the tape passes near the sending point of the head drum, so by moving the guide post D G, the angle of approach to the inclined post can be made smaller. , Therefore, the delivery angle is also small, and as a result, the running load is reduced.

[Brief explanation of drawings]

FIG. 1 is a plan view of a tape running system according to an embodiment of the present invention, and FIG.
The figure is a perspective view showing how the tape is twisted using the inclined post, and FIG. 3 is a sectional view of FIG. 2 taken at the tape center. 1... Cassette, 2... Supply reel, 3... Take-up reel, 4.5... Cullet post, 6... Head drum, 7... Head drum inclination direction, 8. 10.1
2... Supply side roller post, 9... Supply side inclined post, 11... Erase head, 13.15.19...
・Take-up side roller post, 14... Take-up side inclined post,
18... Key Bustan, 20... Pinch roller,
22... Supply side cross line, 23... Winding side cross line agent Yoshihiro Moriki 22

Claims (1)

[Claims] 1. Tilt the rotational axis of the head drum almost toward the supply side reel stand, so that the height of the tape guide lead provided on the head drum is at the point closest to the cassette and slightly lower than the bottom edge of the tape when the cassette is stored. the head drum is arranged such that the tilt angle of the rotation axis of the head drum is slightly larger than the tilt angle of the video track recorded on the tape, and on the tape supply side to the head drum, the tape supplied from the cassette is A line of intersection formed by a plane orthogonal to the tape entering the head drum and a plane orthogonal to the tape entering the head drum is located near the tape supply port of the cassette and on the head drum side when viewed from the cassette, and forms a small angle with the front surface of the cassette. On the tape delivery side from the head drum, there is a line of intersection formed by a plane perpendicular to the tape delivered from the head drum and a plane perpendicular to the tape wound on the cassette. A magnetic recording/reproducing device having a tape running path formed near the tape sending point of the head drum and passing outside the head drum.