JPH0520750A - Tape loading mechanism - Google Patents

Abstract

PURPOSE:To prevent unsymetrical extention of a tape on one side due to winding of the tape around a slant guide post in the midst of loading the tape in the tape loading mechanism including the slant guide post for displacing a tape path up and down. CONSTITUTION:A main link 58 capable of turning freely approximately back and forth is arranged in the vicinity of a slant guide 52 on the exit side, which moves back and forth, and a dedicated drawing post 57 that is vertical to a turning end part of the main link is supported, and during loading the tape, the above dedicated drawing post is positioned in the rear of the slant guide post so that the magnetic tape 6 cannot be wound around the slant guide post. Then, approximately simultaneously with completion of loading the tape, the dedicated drawing post is moved to be in front of the slant guide post to make the magnetic tape wound around the slant guide post.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel tape loading mechanism. More specifically, a tape guide post is provided for performing tape loading in which a predetermined tape path is formed by pulling out a tape from a tape cassette and winding the tape around a head drum or the like. The present invention relates to a tape loading mechanism including an inclined guide post for displacing, and it is possible to prevent one-sided elongation of the tape caused by winding the tape around the inclined guide post during the tape loading operation, and a means therefor. The present invention aims to provide a novel tape loading mechanism that does not impair the formation of the tape path in the tape loading completed state.

[0002]

2. Description of the Related Art A video tape player (VTR) and a rotary head type digital audio tape player (R-
Recording and reading of signals on a magnetic tape by a tape player equipped with a rotary head such as DAT) is a helical scan system in which a recording / reproducing magnetic head scans the recording surface of the magnetic tape in a direction inclined with respect to the traveling direction. Done by.

Therefore, in this type of tape player, a head drum having a cylindrical outer peripheral surface and a rotary magnetic head that moves along the outer peripheral surface is provided, and at least recording or reproduction is performed. Prior to that, the tape is loaded so that the magnetic tape is pulled out from the mounted tape cassette and a part of the magnetic tape passes through a predetermined tape path wound in a substantially spiral shape on the outer peripheral surface of the head drum. After that, the magnetic tape is made to run and the rotating portion of the head drum is rotated so that the magnetic head obliquely scans the recording surface of the magnetic tape.

The mechanism for performing the above-mentioned tape loading is a tape loading mechanism, which is usually provided with a plurality of freely movable tape guide posts, and the tape guide posts are provided in the cassette case of the tape cassette before the tape loading. When the tape is loaded, the tape guide posts are moved to the predetermined positions within the range from the left and right sides of the head drum to the rear, and the magnetic tape is placed inside the magnetic tape along the front surface. A part of the tape is wound around the head drum at a predetermined winding angle.

By the way, since the magnetic tape has to be wound around the head drum in a spiral shape, the shaft of the head drum is in the vertical direction, that is, the vertical direction when the cassette mounting surface is viewed as a horizontal plane (this direction). Is the same as the width direction of the magnetic tape in the tape cassette.) Or when it cannot be greatly tilted, the tape path is displaced in the vertical direction and the tape winding start position and winding position on the head drum are adjusted. Generally, the height of the end position is different from that of the end position.

In a tape loading mechanism for forming such a tape path, some inclined guide posts whose axial direction is inclined with respect to the vertical direction in order to smoothly displace the tape path in the vertical direction. Is used.

FIG. 12 shows an example a of a conventional tape loading mechanism having such an inclined guide post.

In the figure, b is a head drum, and c is a capstan arranged on the right side of the head drum b. The head drum b and the capstan c are provided on a chassis (not shown). The axis of b is substantially vertical.

Reference numeral d is a magnetic tape, and a portion located along the front surface of the tape cassette extends in the left-right direction through a position in front of the head drum b as indicated by a dashed line before the tape is loaded. ing.

Reference numeral e is a guide roller, f is a first inclined guide post, g is a second inclined guide post, and h is a vertical guide post. These guide rollers e, inclined guide posts f and g, and a vertical guide post h. Are movably supported by the chassis and are held at the initial position inside the magnetic tape d as indicated by the one-dot chain line before the tape loading.

Although the drawing shows only the guide post located on the right side of the head drum b when the tape loading is completed, in reality, various guide posts located on the left side of the head drum b are also provided. .

Then, when the tape loading is started, the guide rollers e, the inclined guide posts f and g, and the vertical guide posts h respectively move to the loading completion position indicated by the chain double-dashed line. That is, the first tilted guide post f moves to a position substantially right behind the head drum b, the guide roller e is located immediately behind it, and the second tilted guide post g is located on the left behind the capstan c. To the position, the vertical guide post h moves to the position on the right side of the rear of the capstan c, and the first inclined guide post f and the guide roller e move the second inclined guide post g and the vertical guide post h. After stopping, it is also displaced downward by a member that guides the moving system path and is tilted to the left.

Incidentally, when the tape loading is completed, the inclined guide post, the guide roller and the like not shown which are on the left side of the head drum b are displaced upward.

Thus, the magnetic tape d is pulled out from the tape cassette by a predetermined amount, and a part of the magnetic tape d is spirally wound around the outer peripheral surface of the head drum b, that is, from the winding start position to the winding end position. The tape is wound so as to be displaced downward, and the tape path from the winding end position is the first
The inclined guide post f, the guide roller e, and the second inclined guide post g are sequentially wound and displaced upward, and when they are separated from the second inclined guide post g, they reach the same height as the magnetic tape in the tape cassette. From there, it is wrapped around the capstan c and the vertical guide post h.

The vertical displacement of the tape path is performed in this way.

[0016]

By the way, when the tape is wound around the inclined guide post, the tape path defining member located in the front and / or rear of the inclined guide post in the tape path is inclined in a predetermined direction. Or at a position higher or lower than the inclined guide post, it is performed uniformly over the entire tape width.

However, the tape loading mechanism a
In this case, the tape path defining members positioned before and after the second inclined guide post g, that is, the guide roller e and the vertical guide post h, are both inclined to the second inclination from the start of the tape loading until just before the completion. Since the magnetic tape d is at the same height as the guide post g and is held in a vertical posture, the winding of the magnetic tape d around the second inclined guide post g is performed as shown by the solid line in FIG. Only the lower edge is tightly wrapped and the rest is lightly contacted or uncontacted.

Since the magnetic tape d is wound in such a state and is pulled out from the cassette case, the tension of the magnetic tape d becomes extremely high at its lower edge portion, and this portion is left over. A so-called one-sided elongation that extends to the part occurs.

[0019]

Therefore, in order to solve the above-mentioned problems, the tape loading mechanism of the present invention extends in the direction substantially perpendicular to the vicinity of the inclined guide post for tape loading and moves the inclined guide post. In the direction, a drawer-only post that moves between a first position preceding the inclined guide post and a second position retracted from the inclined guide post is provided, and the drawer-only post is the first while the tape loading is being performed. The tape is prevented from being wound around the tilted guide post by being held at the position, and the pull-out post is moved to the second position to wind the tape around the tilted guide post almost at the same time when the tape loading is completed. It is a thing.

[0020]

Therefore, in the tape loading mechanism of the present invention, since the tape is not wound around the inclined guide post during the tape loading, the attitude and the tape width of the tape path defining member positioned before and after the inclined guide post are not affected. Regardless of the position in the direction, it is possible to prevent one-sided elongation of the tape caused by winding the tape around the inclined guide post during the tape loading.

Since the pull-out post is separated from the tape substantially at the same time as the completion of the tape loading, the formation of a necessary tape path is not impaired, and the support member for supporting the pull-out post and its position control are performed. A high precision is not required for the means for performing the pulling-out operation, and therefore the provision of the pulling-out post is unlikely to increase the cost of the tape loading mechanism.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the tape loading mechanism of the present invention will be described below with reference to the embodiments shown in the accompanying drawings.

The embodiment shown in the drawings applies the present invention to a tape loading mechanism in a video tape recorder 1 which uses a tape cassette conforming to the 8 mm video standard in which the outer shape and dimensions are standardized. It was done.

Before explaining the video tape recorder 1,
An example 2 of a tape cassette used in the video tape recorder 1 will be described (see FIGS. 1 to 4).

Reference numeral 3 denotes a cassette case of the tape cassette 2, which has a relatively thin box shape in which two halves each having a rectangular shape when viewed in the thickness direction are integrally joined, and both left and right ends of a front surface 3a thereof. Tape outlets 4 and 4 are formed in the portion, and the tape outlets 4 and 4 are provided with in-cassette guides 5 and 5 extending in the thickness direction of the cassette case 3.

A pair of tape reels 7, 8 on which a magnetic tape 6 is wound inside the cassette case 3, that is, a supply-side tape reel 7 (hereinafter referred to as "S reel") and a winding-side tape reel 8 are provided. (Hereinafter, referred to as “T reel”.) Is rotatably housed and movably housed so that the axial distance between them can be expanded or contracted.

Reference numerals 9 and 9 denote reel holding plates, which are located at the bottom of the cassette case 3 so as to be offset to the left and right sides respectively.
In addition, the front end portion is rotatably supported by the bottom plate 10 of the cassette case 3, and the reel holding plates 9 and 9 are provided with two ends.
One tape reel 7 and 8 is rotatably supported separately. The reel holding plates 9 and 9 measure the axial distance between the two tape reels 7 and 8 as a standard axial distance according to the 8 mm video standard (hereinafter referred to as "standard axial distance").
4 and the open position shown in FIG. 4, that is, the axial distance between the two tape reels 7 and 8 is somewhat longer than the standard axial distance (hereinafter referred to as “enlarged axial distance”). The video tape recorder 1 is moved to the open position according to the movement when the reel base is moved by the video tape recorder 1, and is otherwise held at the standard position.

In the tape reels 7 and 8, the lower ends of the hubs 11 and 11 which are the tape winding portions are reel holding plates 9 and 9.
The reel support holes 9a and 9a (see FIG. 3) formed in the bottom support plate 10 are rotatably supported by the reel holding plates 9 and 9 and are formed in the bottom plate 10. It faces the outside of the cassette case 3 through 10a (see FIG. 3).

Reference numerals 9b and 9b are interlocking holes formed at the rotating ends of the reel holding plates 9 and 9.

The magnetic tape 6 emerges from the S reel 7 and is wound around one of the in-cassette guides 5 so that the cassette case 3
The tape is guided out into the cassette case 3 and reaches the T reel 8 from a position where the magnetic tape 6 is led out to the outside and wound around the other guide 5 in the cassette. It is located along the front surface 3a of the cassette case 3 while being stretched between them.

On the bottom plate 10 of the cassette case 3, a magnetic tape 6 stretched between the left and right guides 5 in the cassette.
A notch 10b is formed by largely notching the rear part of the notch 10b, and the notch 10b has a substantially forward trapezoidal shape. The notch 10b is entirely opened by moving the reel holding plates 9, 9 to the open position (see FIG. 4).

A recessed space 12 corresponding to the notch 10b in the cassette case 3 serves as a mouse portion into which a head drum or the like is inserted during recording or reproduction.

Reference numeral 13 is a lid for opening and closing the front surface 3a of the cassette case 3. As shown by the solid line in FIG. 3, the portion of the magnetic tape 6 which is stretched between the guides 5 and 5 in the cassette is stretched. It is movable between a closed position which is located so as to cover it from the front and an open position where the front side of the magnetic tape 6 is open as shown by the two-dot chain line in the figure, and the movement to the open position is performed by the video tape recorder 1. It is performed by the opening mechanism,
Otherwise, it is held in the closed position.

The tape cassette 2 is constructed as described above. Therefore, in the tape cassette 2, the front surface 3a of the cassette case 3 is closed by the lid body 13, and 2
The tape reels 7 and 8 are mounted on the video tape recorder 1 in a state where the axial distance between them is the standard axial distance.

The video tape recorder 1 includes a fixed portion 15 based on the fixed chassis 14 and the fixed chassis 14.
And a movable portion 17 based on a slide chassis 16 slidably supported by the.

The fixed chassis 14 is slightly larger than the planar shape of the tape cassette 2 and is in the left-right direction (the leftward direction in FIG. 1 is the left side, and the rightward direction is the right side. The downward direction is referred to as the front side, and the upward direction is referred to as the rear side.
The front and back of the tape cassette 2 are reversed. )
The main portion 18 has a long rectangular flat plate shape and a short guide wall 19 and 19 which is erected from both left and right edges of the main portion 18. The guide wall 19 and 19 has a guide groove 1 extending in the front-rear direction.
9a and 19a are formed. In addition, guide columns 20 and 20 are provided upright on both left and right front ends of the upper surface of the main portion 18. The guide columns 20 and 20 have a height about one third of the thickness of the tape cassette 2. ing.

Then, on the upper surface of the main portion 18 of the fixed chassis 14, the head drum 21 is provided at a position near the rear end of the central portion.
Further, a main motor 22 is fixed to the left side of the head drum 21, and a capstan motor 23 is fixed to the right side of the head drum 21, and a capstan 24 projects upward from the capstan motor 23. There is.

The head drum 21 is the fixed chassis 1
4 and the fixed drum 21a
The rotary drum 21b rotatably supported by the fixed drum 21a in a state of being positioned above a and the rotary drum 21 in a state of being positioned between the fixed drum 21a and the rotary drum 21b.
The magnetic tape is composed of a plurality of rotating magnetic heads (not shown) which are supported by b and move along the outer peripheral surface of the head drum 21, and whose axes extend in a direction substantially perpendicular to the main portion 18 of the fixed chassis 14. When recording or reproducing is performed for 6, the rotary drum 21b is rotated at a high speed, and the rotation is performed by a drum motor (not shown).

Reference numerals 25 and 25 'are guide members for guiding a moving system path of a tape loading block, which will be described later, and are arranged so as to be substantially in contact with the head drum 21 from the rear, and the left guide member 25 is at the left end thereof. Is inclined at the same height as the main part of the slide chassis 16 described later and the right end is positioned at a height slightly lower than the upper end of the fixed drum 21a, and the right guide member 25 'is The left end of the fixed drum 21a is also at the same height as the lower end of the fixed drum 21a, and the right end thereof is at substantially the same height as the main part of the slide chassis 16, which is also inclined upward to the right.

The left guide member 25 has a guide groove 25a whose left end is open, and the right guide member 25 has a guide groove 25a.
′ Is formed with guide grooves 25 ′ a whose right end is open, and these guide grooves 25 a, 25 ′ a are formed so as to extend in a substantially arc shape with the axis of the head drum 21 as the center.

Reference numeral 26 denotes an inclined guide post (hereinafter referred to as "inlet side inclined guide") provided upright on the left end of the left guide member 25, and the upper end of the inlet side inclined guide 26 is slightly left front. It is inclined to move to.

The slide chassis 16 is the fixed chassis 14.
The main portion 27 has a flat plate shape having substantially the same size as that of the main portion 18, and side walls 28, 28 raised from the left and right side edges thereof and a front wall 29 raised from the front side edge thereof.
Guide grooves 30, 3 extending in the front-rear direction are provided on both left and right side portions of 7.
0 is formed, and leg pieces 28a, 28a are vertically provided from the lower edges of the rear end portions of the side walls 28, 28.
Guide pins 31, 31 are provided on 28a so as to project leftward.

The guided pins 31, 31 are slidable in the guide grooves 19a, 19a formed in the fixed chassis 14, and the upper ends of the guide columns 20, 20 erected on the fixed chassis 14. Are slidably engaged with the guided grooves 30, 30 of the slide chassis 16, respectively,
As a result, the main portion 27 of the slide chassis 16 is at a position slightly higher than the main portion 18 of the fixed chassis 14, and is supported by the fixed chassis 14 slidably in the front-rear direction.

Incidentally, such a slide chassis 16 is
As shown in FIG. 1, as a whole, it is moved between a drawing-out position located in front of the head drum 21 and a drawing-in position facing the fixed chassis 14 so as to entirely overlap with the fixed chassis 14, as shown in FIG. The movement is performed by a moving mechanism (not shown) including the main motor 22 and the cam gear 32 provided on the fixed chassis 14.

A relatively large notch 33 having a substantially U-shape that opens rearward is formed at the center of the rear side edge of the main portion 27 of the slide chassis 16.
When is moved to the retracted position, the head drum 21 is positioned in the notch 33 (see FIG. 4).

34 is an S-side reel stand with which the S-reel 7 is engaged, and 35 is a T-side reel stand with which the T-reel 8 is engaged. These two reel stands 34 and 35 are spur gear-shaped gears. Parts 36, 36, and substantially disk-shaped reel mounting parts 37, 37 located at a position slightly higher than the gear parts 36, 36,
The reel mounting portions 37, 37 are composed of reel engaging shafts 38, 38 and the like protruding upward from the central portion.

The reel bases 34 and 35 are positioned so that the upper portions of the reel mounts 37 and 37 project upward from the main portion 27 of the slide chassis 16 and the axes between them. It is movably installed so that the distance between them can be increased or decreased.

That is, 39 and 40 are two reel stands 34,
It is a flat reel base lever that supports 35 separately.
These reel base levers 39 and 40 are the slide chassis 1
6 is located at a height slightly lower than that of the main portion 27, and is located at a position corresponding to the left half portion and the right half portion of the portion that is biased toward the front end side of the main portion 27 in the horizontal direction. The rear end portion is supported by the main portion 27 so as to be horizontally rotatable.
In the initial state in which the tape cassette 2 can be attached and detached, it is located at the initial position shown in FIG. 1 by the tensile force of the tension springs 41, 41 suspended between it and the slide chassis 16, and the slide chassis 16 is in the retracted position. Before starting the movement toward the two reel stands 3
It is moved to the open position with the distance between the axes of 4, 35 expanded.
This movement is also performed by the moving mechanism having the cam gear 33.

The axial distance between the two reel bases 34 and 35 when the reel base levers 39 and 40 are in the initial position is the same as the standard axial distance, and is in the open position. The axial distance between the reel bases 34 and 35 when moved to is the same as the enlarged axial distance.

Reel stand insertion holes 27a, 27a, which are relatively large and have a long hole shape, are formed in a substantially middle portion between the central portion and the left and right ends of the main portion 27. The upper portions of the reel mounting portions 37, 37 of 34, 35 are projected above the main portion 27 of the slide chassis 16 through the reel base insertion holes 27a, 27a.

Reference numerals 42 and 42 are interlocking pins erected on the rotating end portions of the reel base levers 39 and 40, and are formed on the main portion 27 of the slide chassis 16 and are the reel base levers 39 and 40.
Slots 27b, 27 extending in an arc shape around the rotation axis of
It is inserted through b and is projected upward.

A relatively short guide groove 27c is formed at a position on the left side of the rear end of the notch 33 in the main portion 27 of the slide chassis 16 and is displaced rearward as it goes rightward, and the right end is open. Further, the width 27h of the portion 27d (hereinafter, referred to as "link support portion") located on the right side of the rear end portion of the notch 33 is relatively small, and the link support portion 27d will be described later. Three links are supported.

Reference numeral 43 denotes a support seat 43 attached to the upper surface of the link support portion 27d for supporting an inclined guide post, a tape loading block, etc., which will be described later, and is a substantially pentagonal flat plate when viewed from above. Shaped guide part 4
4, and projecting rearward from the rear end of the right end of the guide portion 44,
In addition, the support portion 45, which is taller than the guide portion 44, is integrally formed, and the support portion 45 serves as the link support portion 27.
It is fixed to the main portion 27 of the slide chassis 16 with screws 46, 46, ... While seated in the rear portion of d.

The supporting portion 45 has a substantially U-shape that opens downward as viewed in the left-right direction (see FIG. 8), and the portion other than the front end portion thereof is slightly separated from the link supporting portion 27d. A relatively short guide groove 44 which has a space and which extends in a direction displacing rearward as it goes leftward at a position near the rear end of the guide portion 44 and whose left end is open.
a is formed.

Reference numeral 47 is a tape loading mechanism, and the tape loading mechanism 47 is the guide member 25, 2.
5'and two guide blocks to be described later, one inclined guide post and a flip guide, a drawer-only post, and means for controlling the position of the drawer-only post.

Reference numerals 48 and 48 'are guide blocks, which are movable bases 49 and 49', guide rollers 50 and 50 'supported by the movable bases 49 and 49', and inclined guide posts 51 and 51 '(hereinafter, " The slide chassis 16 is supported so as to be separately movable along the left and right guide grooves 27c and 44a provided in the slide chassis 16 before the slide chassis 16 reaches the retracted position. In this state, the guide rollers 50, 50 'and the left-side movable inclination guide 51 are held in a substantially vertical posture, and the right-side movable inclination guide 51' is tilted after being slightly tilted.

Reference numeral 52 denotes an inclined guide post (hereinafter referred to as "outlet side inclined guide") provided upright on the rear end portion of the support portion 45 of the support seat 43, and the outlet side inclined guide 52 is substantially in front. It is leaning down.

Reference numeral 53 designates a flip arm which has a substantially vertical flip guide 54 supported at one end thereof, and the flip arm 53 has a slide chassis 16 at a position near the other end.
In the initial state, that is, in the state where the slide chassis 16 is in the pulled-out position, the cam follower 55 (which is vertically installed at the other end of the main part 27 is rotatably supported at the rear end of the right end of the main part 27. The position of the fixed chassis 14 is shown in FIG.
By being regulated by the regulation cam 56 and the like attached to the rear side, it is held in a posture that extends in the substantially left-right direction as shown in FIG. 1, whereby the slide guide 54 is separated from the outlet side inclined guide 52 to the right by a slight distance. Is held in the initial position.

Reference numeral 57 is a drawer-only post. The pull-out post 57 is for preventing the magnetic tape 6 from being wound around the outlet side inclined guide 52 during the tape loading operation, and three links rotatably supported by the link support portion 27d. Supported by one of.

Reference numeral 58 is a main link, 59 is a controlled link, 60 is an intermediate link, and the pull-out post 57 is supported by the main link 58.

The main link 58 has a boss 62 in the form of a short cylinder on the lower surface of the base of a main portion 61 which is generally V-shaped when viewed from above.
And a post 57 for exclusive use of drawer is erected at the tip of the main portion 61. An insertion hole 61a reaching the lower surface of the boss 62 is formed in the base portion of the main portion 61, and a support hole 61b is formed in the middle portion of the main portion 61.

Reference numeral 63 denotes a support shaft extending in the vertical direction, and both ends thereof are separately supported by the center portion of the support portion 45 of the support seat 43 and the link support portion 27d, and the intermediate portion thereof is at the base portion of the main link 58. The main link 58 is rotatably inserted in the formed insertion hole 61a, whereby the main link 58 is supported rotatably in the horizontal direction at a portion in contact with the lower end of the outlet-side inclined guide 52 from the rear.

Reference numeral 64 is a torsion spring, the coil portion 64a of which is externally supported by the boss 62 of the main link 58, and the distal end portion of one arm 64b thereof is the link support portion 27.
The other arm 64c has its tip end locked to the rear edge of the main part 61 of the main link 58, and the elastic force of the torsion spring 64 causes the main link 58 to rotate counterclockwise as viewed from above. While the turning force in the direction is urged and the tip portion of the main portion 61 abuts the support seat 43 while not being pulled in the clockwise direction, the main seat 61 is held at the standby position shown in FIG. 7, and in this state, The post 57 for exclusive use of drawer is located a little behind the outlet side inclined guide 52.

The controlled link 59 is substantially L-shaped when viewed from above, and its bent portion is horizontally rotatable on a support shaft 65 provided upright on the upper surface of the rear end of the link support portion 27d. A controlled pin 66 is vertically provided on the lower surface of the tip of the short arm while being supported.

Both ends of the intermediate link 60 are provided through the joint shafts 67 and 67 'at the support hole 61b at the intermediate portion of the main portion 61 of the main link 58 and at the tip of the long arm of the controlled link 59. The support holes 59a are rotatably connected to each other.

Therefore, the main link 58, the controlled link 59, and the intermediate link 60 are connected so as to form a four-bar link including the link support portion 27d and the support seat 43,
When the main link 58 is in the standby position, the controlled pin 66 is located right behind the link support portion 27d.

Reference numeral 68 is a cam plate for controlling the position of the pull-out post 57 by controlling the position of the controlled pin 66. The cam plate 68 is fixed to the upper surface 23a of the capstan motor 23. The right side edge 69 is a cam edge.

The front end portion 69a (hereinafter referred to as "pressing portion") of the cam edge 69 is formed so as to be displaced rightward as it goes rearward, and the portion 6 following the pressing portion 69a is formed.
9b (hereinafter referred to as "holding portion") is formed so as to extend in the front-rear direction, and the rear end portion 69c (hereinafter referred to as "return portion") is formed so as to be displaced leftward as it goes rearward. ing.

The cam plate 68 is located at the same height as the lower part of the controlled pin 66.

Reference numeral 70 denotes a pinch roller arm having a pinch roller 71 rotatably supported at one end thereof, and reference numeral 72 denotes a tengu arm having a tenregi pin 73 provided upright at one end thereof. The portion is horizontally rotatably supported by the main portion 27 of the slide chassis 16, and in the initial state,
As shown in FIG. 1, the pinch roller 71 is held at the right side position of the right guide block 48 ′, and the tenon pin 73 is held at the left side position of the left guide block 48.

The movable part 17 is constructed as described above, and the space 74 inside the slide chassis 16 serves as a cassette mounting part to which the tape cassette 2 is removably mounted.

The mounting and removal of the tape cassette 2 from the cassette mounting portion 74 are performed with the slide chassis 16 in the pull-out position. This tape cassette 2
For mounting, the front surface 3a of the cassette case 3 is the head drum 2
Perform in the direction opposite to 1.

When the tape cassette 2 is mounted on the cassette mounting portion 74, the reel engaging shafts 38, 38 of the reel bases 34, 35 relatively move to the hub 1 of the tape reels 7, 8.
1 and 11 are inserted into the reel base engaging holes 11a and 11a (see FIG. 3), whereby the S reel 7 and the T reel 8 rotate integrally with the S side reel base 34 and the T side reel base 35, respectively. To be engaged.

Further, interlocking pins 42, 42 provided upright on the reel base levers 39, 40 are individually inserted through the interlocking holes 9b, 9b of the reel holding plates 9, 9 to support the S reel 7. The reel holding plate 9 and the S-side reel base lever 39
Further, the reel holding plate 9 supporting the T reel 8 and the T side reel base lever 40 are linked so as to be able to move integrally.

When the tape cassette 2 is mounted in the cassette mounting portion 74, the guide blocks 48, 48 'are also provided.
Guide rollers 50, 50 'and movable tilt guides 51,
51 ′, outlet side inclined guide 52, flip guide 54,
The pull-out dedicated post 57, the pinch roller 71, and the ten pin pin 73 are all located inside the magnetic tape 6 located along the front surface of the cassette case 3 (see FIGS. 1 and 2).

The lid 13 of the tape cassette 2 is moved to the open position in accordance with the operation of closing the cover (not shown) that opens and closes the upper surface of the cassette mounting portion 74, and the cassette case 3 slides when the cover is closed. It is crimped onto the upper surface of the main portion 27 of the chassis 16.

The tape cassette 2 is mounted on the cassette mounting portion 74 as described above.

Therefore, when a command for retracting the slide chassis 16 is issued, first, the reel base lever 39,
After the slider 40 is moved to the open position together with the reel holding plates 9 and 9 to increase the distance between the two tape reels 7 and 8, the slide chassis 16 is moved to the retracted position, and the slider arm 53 is moved therebetween. , The pinch roller arm 70 and the balance leg arm 72 are moved to predetermined positions to start tape loading, and then the guide block 4
8, 48 'are transferred onto the guide members 25, 25' to complete the tape loading.

That is, when the slide chassis 16 moves to the retracted position, the head drum 21 is relatively inserted into the mouse portion 12 of the cassette case 3, and the guides 5 and 5 in the cassette of the tape cassette 2 are inclined toward the entrance side. Guide 2
6 and the capstan 24. As a result, the magnetic tape 6, which has been positioned along the front surface of the cassette case 3 until then, moves to the inner side of the mouth portion 12 while the middle portion thereof is wound around the portion of the outer peripheral surface of the head drum 21 which faces substantially forward. And the left side portion from the intermediate portion is the inlet side inclined guide 26 and the left side guide roller 50.
The right part is wrapped around the guide roller 50 on the right.
′, Is wound around the outlet side inclined guide 52 and the capstan 24.

When the slide chassis 16 starts to move toward the retracted position, the flip follower arm 53 pivots rearwardly due to the cam follower 55 thereof being pushed substantially forward by the front end of the regulating cam 56. As a result, the portion of the magnetic tape 6 located between the guide 5 on the right side of the cassette and the capstan 24 is wound around the slide guide 54, and the balance leg arm 72 is released from its initial position. By doing so, it is rotated substantially rearward by the pulling force of a tension spring (not shown), so that the ten-legged pin 73 is positioned between the left cassette guide 5 and the inlet side inclined guide 26 of the magnetic tape 6. The part that is attached is wrapped.

Further, when the slide chassis 16 reaches the retracted position, the guide groove 27c of the slide chassis 16 and the guide groove 44a of the support seat 43 are connected to the guide grooves 25a and 25'a of the guide members 25 and 25 ', respectively. (Fig. 4
reference). From this state, the left guide block 48 passes through the left guide grooves 27c-25a, and the right guide block 48 'passes through the right guide grooves 44a-25'a to the loading completion position substantially right behind the head drum 21, respectively. The guide block 48 on the left side is moved to the left side of the rotary drum 2 in such a posture.
Located at approximately the same height as 1b, the right guide block 48
′ Is located at substantially the same height as the fixed drum 21a.

By the above, the tape loading is completed,
In this state, the magnetic tape 6 is passed through a required path.

That is, the magnetic tape 6 comes out from the S reel 7 and is located on the left side in the cassette guide 5-tenregi pin 73-entrance side inclination guide 26-guide roller 50-moving inclination guide 51-head drum 21-moving inclination guide 51 '. -Guide roller 50'-Outlet side inclined guide 52-Capstan 24-Flider guide 54-Right side cassette guide 5
Is wound in this order and reaches the T reel 8 through a pass.

Then, such a tape path is vertically displaced between the ten-legged pin 73 and the outlet side guide 52. That is, on the left side of the head drum 21, the magnetic tape 6 is wound around the ten-legged pin 73, the inlet side inclined guide 26, the guide roller 50, and the moving inclined guide 51, all of which are inclined in a predetermined direction. Is gradually displaced upward as it approaches, then downwardly displaced from the position where it is wound around the movable tilt guide 51, and is wound around the peripheral surface of the head drum 21 in a substantially spiral shape. All the paths are inclined in a predetermined direction, the moving inclination guide 51 ', the guide roller 50' and the exit side inclination guide 5
The tapes are gradually wound upward as they are wound on the sheet 2 sequentially, and when they are wound on the outlet side inclined guide 52, they return to the same height as the in-cassette guide 5.

The pinch roller arm 70 is fixed to the fixed chassis 1 immediately before the slide chassis 16 reaches the retracted position.
By a cam (not shown) provided in FIG. 4, the pinch roller 71 is pivoted to the right to the right, so that the slide chassis 16 reaches the retracted position and the pinch roller 71 is pressed against the guide 24 while sandwiching the magnetic tape 6.

When such tape loading is performed, the pull-out post 57 is provided with the outlet-side inclined guide 5
2 to a position preceding by 2, so that the exit side inclined guide 52 is provided until just before the tape loading is completed.
Do not let the magnetic tape 6 wrap around. Less than,
This operation will be described (see FIGS. 7 and 9 to 11).

When the tape cassette 2 is mounted, the outlet side inclined guide 52 is located in front of the magnetic tape 6. Further, when tape loading is performed, the outlet-side inclined guide 52 moves straight rearward, but when the tape cassette 2 is mounted, the pull-out post 57 is provided in the outlet-side inclined guide 52 with respect to the moving direction of the outlet-side inclined guide 52. The tape has come to a more retracted position (hereinafter referred to as “retracted position”) (see FIG. 7), and the tape in the state where the outlet-side inclined guide 52 and the drawer-only post 57 have such a positional relationship. Loading starts.

Then, when the slide chassis 16 moves toward the retracted position, the portion of the magnetic tape 6 located along the front surface of the cassette case 3 that faces the outlet side inclined guide 52 (hereinafter, " As shown in FIG. 9, the "outlet guide facing portion") is close to the outlet side inclined guide 52 with both side portions thereof being bridged by the right guide roller 50 'and the flip guide 54.

Further, when the slide chassis 16 reaches a position just before reaching the retracted position, the controlled pin 66 provided on the controlled link 59 comes into contact with the pressing portion 69a of the cam edge 69 of the cam plate 68, The controlled pin 66 is relatively pushed to the front right (see FIG. 10). As a result, the controlled link 59 is rotated clockwise, so that the intermediate link 60 is pulled substantially rearward and the main link 58 is rotated clockwise. As a result, the pull-out post 57 is moved to a position slightly ahead of the outlet-side inclined guide 52 (hereinafter, referred to as “leading position”), so that the outlet guide facing portion of the magnetic tape 6 is moved to the pull-out post 57. It is wound and separated from the inclined guide 52 on the outlet side by a distance.

Immediately after this, an intermediate portion of the magnetic tape 6 between the outlet guide facing portion and the portion wound around the flip guide 54 is wound around the capstan 24 from the front.

At this time, when there is no post 57 for exclusive use of drawing, the exit guide facing portion of the magnetic tape 6 is wound around the exit side inclined guide 52, and the winding is uneven tension in the width direction, that is, Although the tension on the lower edge is very high and the tension on the upper edge is extremely low, unbalanced tension is used. However, since the pull-out post 57 is standing vertically, the width of the magnetic tape is wound around it. The tension is uniform in all directions.

This state is held while the controlled pin 66 is in contact with the holding portion 69b of the cam plate 68.

Immediately before the slide chassis 16 reaches the retracted position, the controlled pin 66 separates from the holding portion 69b of the cam plate 68 and corresponds to the returning portion 69c. As a result, the main link 58 is rotated counterclockwise by the turning force given by the torsion spring 64, and the pull-out dedicated post 57 is returned to near the retracted position (see FIG. 11).

As a result, the pull-out post 57 is separated from the magnetic tape 6 forward, so that the outlet guide facing portion of the magnetic tape 6 is wound around the outlet side inclined guide 52. Immediately after this, the guide block 48 'is moved to the loading left position lower than the exit side inclined guide 52 while tilting to the left, so that the winding of the magnetic tape 6 around the exit side inclined guide 52 is uniform in the entire width direction. It is made with various tensions.

However, the winding of the magnetic tape 6 around the outlet side inclined guide 52 is performed almost at the same time when the slide chassis 16 reaches the retracted position, and until then, it is blocked by the dedicated pull-out post 57. As a result, the magnetic tape 6 is prevented from stretching on one side.

For recording or reproduction on the magnetic tape 6, the magnetic tape 6 is moved by the capstan 24 and the pinch roller 71 from the tape loading completed state, and
This is performed by rotating the rotating portion of the head drum 21, and the traveling magnetic tape 6 is given an appropriate tension by the rotational force urged by the ten-legged pin 73.

Reference numeral 75 denotes a swing lever provided substantially at the center of the front end of the upper surface of the main portion 18 of the fixed chassis 14, and an idler gear 76, which is rotated by transmitting the rotation of the capstan motor 23 at its rotating end. When the magnetic tape 6 travels, the idler gear 76 moves the gear portion 36 of the T-side reel stand 35 in accordance with the traveling direction of the magnetic tape 6.
Alternatively, the T reel 7 or the S reel 8 is rotated in the tape winding direction by meshing with the gear portion 36 of the S side reel stand 34.

When the tape cassette 2 is taken out, the slide chassis 16 is moved to the pull-out position and
Tape unloading, that is, winding of the tape on the tape reel is performed. That is, in this case, first, the guide blocks 48, 48 ′ are moved onto the guide grooves 27 c, 44 a and returned to the slide chassis 16, and then the slide chassis 16 is returned to the pull-out position, whereby the head drum 21. Goes out from the mouse portion 12 of the tape cassette 2, and the flip guide 54, the pinch roller 71, and the ten pin pin 73 are returned to the initial position. Then, the S reel 7 is rotated in the tape winding direction at the same time when the movement of the guide blocks 48, 48 'is started, whereby the magnetic tape 6 is wound around the S reel 7 without slack.

Even when this tape unloading is performed, the magnetic tape 6 is prevented from being wound around the outlet side inclined guide 52.

That is, when the slide chassis 16 moves toward the pulled-out position, the controlled pin 66 of the controlled link 59 rides on the holding portion 69b of the cam plate 68 and the controlled link 59 rotates clockwise. Since it is moved, the main link 58 is rotated in the same direction, whereby the drawer-only post 57 moves to the preceding position located behind the outlet-side inclined guide 52, comes into contact with the magnetic tape 6, and exits. The magnetic tape 6 is separated from the side tilt guide 52.

When the slide chassis 16 further moves toward the pull-out position, the magnetic tape 6 is separated from the capstan 24, and then the controlled pin 66 is moved to the cam plate 6.
8, the main link 58 is rotated in the counterclockwise direction by the turning force given by the torsion spring 64, and the pull-out post returns to the retracted position to return to the magnetic tape 6
Away from. In this state, the path of the outlet guide facing portion of the magnetic tape 6 is not contacted with the outlet side inclined guide 52 because the path is defined by the guide roller 50 ′ and the slide guide 54, and from this state, the head drum 2
Since the magnetic tape 6 is displaced rearward from the outlet side inclined guide 52 due to the withdrawal of 1 from the cassette case 3, the magnetic tape 6 does not come into contact with the outlet side inclined guide 52.

[0102]

As is apparent from the above description, the tape loading mechanism of the present invention performs tape loading for forming a predetermined tape path by pulling out a tape from the tape cassette and winding the tape around the head drum or the like. A tape loading mechanism including a tape guide post for moving the tape path in the vertical direction, the tape loading mechanism including a tape guide post for extending the tape path in the vertical direction near the tilt guide post. In the moving direction of the inclined guide post, there is provided a drawer-only post that moves between a first position preceding the inclined guide post and a second position retracted from the inclined guide post, and is drawn out during tape loading. The dedicated post is held in the first position and the tape is wrapped around the angled guide post. Prevents vignetting is of, wherein the complete and substantially simultaneous withdrawal dedicated post of the tape loading has to tape is wound around the second moving to inclined guide post into position.

Therefore, in the tape loading mechanism of the present invention, since the tape is not wound around the inclined guide post during the tape loading, the attitude and the tape width of the tape path defining member positioned in front of and behind the inclined guide post. Regardless of the position in the direction, it is possible to prevent one-sided elongation of the tape caused by winding the tape around the inclined guide post during the tape loading.

Since the pull-out post is separated from the tape substantially at the same time as the completion of the tape loading, the formation of a necessary tape path is not impaired, and the support member for supporting the pull-out post and its position are controlled. A high precision is not required for the means for performing the pulling-out operation, and therefore the provision of the pulling-out post is unlikely to increase the cost of the tape loading mechanism.

In the above embodiment, the pull-out post is made by utilizing the relative movement between the fixed chassis provided with the head drum and the slide chassis provided with the cassette loading portion and the tape loading mechanism. The position of the drawer-only post can be controlled by a simple means.

Further, in the above-described embodiment, the drawer-only post is provided with respect to the inclined guide post located on the outlet side of the head drum, but this drawer-only post is, if necessary, provided on the inlet side of the head drum. It may be provided for the post or both of them.

In addition, the structure or shape of the drawer-only post, the inclined guide post and other parts shown in the above embodiments are merely examples of the embodiment for carrying out the present invention. The technical scope of should not be construed in a limited way. In particular, in the above embodiment, the tape loading is performed inside the cassette case of the tape cassette, but it goes without saying that the tape loading can be performed outside the cassette case.

[Brief description of drawings]

1 shows an example in which the tape loading mechanism of the present invention is applied to a tape loading mechanism in a video tape recorder together with FIGS. 2 to 11. This figure shows a video tape recorder in a state before tape loading is started. It is a top view which shows the whole.

FIG. 2 is an enlarged perspective view showing a main part of a video tape recorder.

FIG. 3 is a view showing a state in which a tape cassette is mounted.
FIG. 3 is an enlarged sectional view taken along line III-III of FIG.

FIG. 4 is an enlarged plan view showing the video tape recorder in a tape loading completed state by horizontally cutting the tape cassette.

FIG. 5 is an enlarged perspective view showing an inclined guide post, a drawer-only post and members around the post.

FIG. 6 is an enlarged perspective view of a main part of the link and the like supporting the drawer-only post in an exploded manner.

FIG. 7 is a plan view showing a state before the tape loading is started by enlarging a portion including a pull-out dedicated post of the tape loading mechanism.

8 is an enlarged cross-sectional view taken along the line VIII-VIII in FIG.

FIG. 9 is a view showing a change in the position of the post for exclusive use of drawing with the passage of time along with FIGS. 10 and 11, and this figure is an enlarged plan view showing an essential part at a substantially intermediate point of tape loading.

FIG. 10 is an enlarged plan view showing a main part at a time point shortly before the completion of tape loading.

FIG. 11 is an enlarged plan view showing a main part in a tape loading completion state.

FIG. 12 is a plan view showing an example of a conventional tape loading mechanism.

[Explanation of symbols]

 2 Tape cassette 6 Tape 21 Head drum 47 Tape loading mechanism 50 Tape guide post 50 'Tape guide post 51 Tape guide post 51' Tape guide post 52 Tape guide post (tilted guide post) 53 Tape guide post 57 Drawer dedicated guide 73 Tape guide post

Claims (1)

Claim: What is claimed is: 1. A tape guide post for tape loading for forming a predetermined tape path by pulling out a tape from a tape cassette and winding the tape around a head drum or the like. Is a tape loading mechanism including an inclined guide post for vertically displacing the tape path, which extends in a direction substantially perpendicular to the inclined guide post and precedes the inclined guide post in the moving direction of the inclined guide post. The pull-out post that moves between the first position and the second position retracted from the inclined guide post is provided, and the pull-out post is held at the first position and tilted while the tape loading is being performed. Prevents tape from being wrapped around the guide post, and is almost the same as the completion of tape loading. Tape loading mechanism, characterized in that the pull-out only post is to tape is wound around the second moving to inclined guide post into a position to.