JPH07105601A - Tape loading mechanism - Google Patents

Abstract

PURPOSE:To make a tape loading(TL) member stabilize at the position where the TL is completed and also to attain to make a device small in size and thin in thickness by providing loading gears, rotating arms and extension coil springs. CONSTITUTION:By the rotating arms 25, 26 supporting the loading(L) gears 29, 31, the extension coil springs 38, 39 are extended with the turning of base members 16, 16' at the position where the loading is completed, and the rotating arms 25, 26 are turned clockwise by this tensile force. Then, the tips of 2nd arm pieces 22, 22' on loading arms 19, 19' are pressed by this turning force to generate the force press-contacting the base members 16, 16' of the TL members which are connected to these tips, on the receiving surfaces 14, 14 of positioning members 12, 12. Consequently, the press-contacting force to make the TL members abut and stabilize on the positioning members is positioning out of the moving routes of the TL members and a member transmitting the moving force, therefore, the whole device can be made small and thin by effectively utilizing the unused space in the device.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a novel tape loading mechanism. Specifically, regarding a tape loading mechanism that moves a magnetic tape from a cassette case to a predetermined position by a tape loading member, there is a design margin regarding the arrangement of the entire mechanism, and it is possible to reduce the size and thickness. It is an object of the present invention to provide a novel tape loading mechanism capable of stably running a magnetic tape.

[0002]

2. Description of the Related Art Conventionally, in a tape loading mechanism, a magnetic tape is wound around a head drum from an initial position where a tape loading member in which a vertical guide roller is erected on a base member can pull out the magnetic tape from a cassette case. The loading operation of moving to the tape loading completion position and the unloading operation of moving from the tape loading completion position to the initial position are performed, and the tape loading member at the tape loading completion position is vertically guided by the tape loading member. A mechanism for pressing the tape loading member onto the positioning member at the tape loading completion position and a vertical girder to prevent the magnetic tape traveling while being guided by the rollers from wobbling and causing a defective running of the magnetic tape. The running of the magnetic tape unit to be in that stable was taken by mechanism for the height adjustment of the Dorora.

FIG. 17 shows an example a of a conventional tape loading mechanism.

Reference numeral b is a mechanical chassis, and head drum c
And various mechanisms are arranged.

D and d are positioning members provided on the left and right of the head drum c at the rear of the mechanical chassis b, and e and e are base members f and f on which vertical guide rollers g and g and inclined guides h and h stand. The tape loading members i, i provided are loading arms having the tip thereof supporting the tape loading members e, e.

Reference numerals j and j denote loading gears which are rotatably supported on the mechanical chassis b and are synchronously rotated in opposite directions by a driving means (not shown). When loading tapes, the loading gears, that is, the left side. Loading gear j is rotated clockwise, and the right loading gear j is rotated counterclockwise.

The loading arms i, i have a first arm piece k, k whose one end is rotatably supported by the mechanical chassis b coaxially with the loading gears j, j and one end piece of which is the first arm piece k. , K are rotatably connected to the rotational ends of the tape loading members e and the base members f, f of the tape loading members e, e.
And a second arm piece 1 and 1 rotatably connected to each other.

M and m are coil spring-like limiter springs, both ends of which project outward, and their coil parts m1 and m.
1 is externally fitted to boss parts j1 and j1 protruding from the center of the loading gear j and j, and one arm m2 and m2
Is locked to the loading gears j and j, and the other arms m3 and m3 are elastically contacted with the pressed pieces k1 and k1 formed on the first arm pieces k and k.

Reference numerals j2 and j2 denote stopper walls formed on the loading gears j and j, and the pressed pieces k1 of the first arm pieces k and k pressed by the other arms m3 and m3 of the limiter springs m and m. , K1 for preventing the movement of the limiter springs m, m in the rotation direction. Therefore, in this state, the elastic force of the limiter springs m, m causes the loading arms i, i.
Is not working on.

However, the loading gears j and j are shown in FIG.
7, the loading arms i, i are folded in a substantially V-shape, and the tape loading members e, e are in the initial position.

When the tape cassette n is mounted at a predetermined cassette mounting position on the mechanical chassis b, the tape loading members e, e of the magnetic tape o are passed through the tape pulling surface of the tape cassette n. Located inside.

When the tape cassette n is mounted on the mechanical chassis b and a recording or reproducing command is issued, the tape loading members e, e are positioned inside the magnetic tape o located on the front surface of the tape cassette n. Move from the state toward the tape loading completion position. At this time, the tape loading members e, the base members f of the e, and the vertical guide rollers g provided on the f and the roller portions p of the g pull out the magnetic tape o from the tape cassette n.

That is, from the initial state, the loading gear j,
When j rotates in the loading direction, the first arm pieces k, k rotate integrally with the loading gears j, j,
The loading arms i, i are extended, and the tape loading members e, e move rearward.
Then, when the tape loading members e, e come into contact with the positioning members d, d, they are prevented from moving further backward, and the loading gears j, j are stopped when they are further rotated in the loading direction by a predetermined amount from this state. To do.

After the tape loading members e, e contact the positioning members d, d, the loading gears j, j
Is rotated relative to the loading arms i, i, the stopper walls j2, j2 thereof are released from the pressed pieces k1, k1 of the first arm pieces k, k and the limiter springs m, m are repulsed. The force acts on the loading arms i, i, and the elastic force of the limiter springs m, m is increased with the rotation of the loading gears j, j, and the tape loading members e, e are crimped to the positioning members d, d. Will be.

Then, the magnetic tape o is pulled out from the tape cassette n by a predetermined amount and a part of the pulled out magnetic tape o is wound around the outer peripheral surface of the head drum c, whereby the tape loading is completed.

FIG. 19 shows an example of a vertical guide roller g'used in a conventional tape loading member e ', and a shaft portion q of the tape loading member e', which is connected to a base member f ', is below the shaft portion q. Is a screw shaft portion q1, and the screw shaft portion q1 is screwed into a screw hole r provided in the base member f ′. The base member f'is a screw hole that extends in a direction perpendicular to the screw hole r from a substantially intermediate position of the screw hole r for screwing the vertical guide roller g ', and is opened on the outer surface of the base member f'. s is provided.

The screw shaft portion q of the vertical guide roller g '
The height of the vertical guide roller g'is adjusted by adjusting the screwing amount of 1 into the screw hole r, and then the fixing screw t is screwed into the screw hole s to screw the vertical guide roller g '. Tighten with respect to q1 to fix the height of the vertical guide roller g '.

FIG. 20 shows an example g "of a vertical guide roller of another conventional tape loading member e".

U is a support shaft whose lower end is fixed to the base member f ″, and its upper end u1 is a screw shaft.

V is a lower flange slidably fitted on the support shaft u, w is a coil spring fitted on the support shaft u between the lower flange v and the base member f ″, and x
Is a sleeve slidably fitted on the support shaft u on the lower flange v, and the roller portion p ″ is attached to the sleeve x.
Is rotatably fitted on the outside.

Reference numeral y denotes an upper flange, and a boss portion y1 and a flange portion y2 protruding laterally from a lower end portion of the boss portion y1.
Are integrally formed, and a screw hole y3 opened at the lower end thereof is formed in the boss portion y1, and the screw shaft portion u1 of the support shaft u is screwed into the screw hole y3.

Therefore, the height of the vertical guide roller g ″ is adjusted by adjusting the screwing amount of the upper flange y into the screw shaft portion u1.

[0023]

In the above-mentioned conventional tape loading mechanism a, a change in force is caused between the loading arm i and the loading gear j, which is in the transmission path of the moving force to the tape loading member e. Since a violent spring m has to be incorporated, the parts will be more crowded at the parts where the parts are crowded, and if a sufficient function is desired, the overall size of the mechanism will be increased, but at the same time, it will be necessary to suppress the size increase. Then, high precision of parts is required, resulting in high cost, but it is still impossible to achieve sufficient miniaturization.

Further, in the tape loading member e'shown in FIG. 19, the vertical guide roller g'is released by loosening its fixing screw for adjusting the height of the vertical guide roller g '.
Can be freely screwed in or unscrewed from the base member f ', but the friction coefficient of the screw shaft portion q1 of the vertical guide roller g'is too small and the vertical guide roller g'is slightly It will turn around with all the power,
It took skill and time to adjust the delicate height.

A fixing screw t for fixing the vertical guide roller g'to the base member f'is screwed from the side surface of the base member f ', and the tip of the fixing screw t is a screw shaft portion of the vertical guide roller g'. Since the vertical guide roller g'is fixed by being squeezed on the side surface of q1, the vertical guide roller g '
The work direction was different when adjusting the height and when fixing, and the workability was poor.

Further, due to the play between the screw shaft portion q1 and the screw hole r, the vertical guide roller g'is tilted in an arbitrary direction during adjustment when the fixing screw t is loosened, and the fixing screw t is narrowed down again for vertical guide. When the roller g'is fixed, the vertical guide roller g'is biased to one side, and there is a problem that the inclination of the vertical guide roller g'changes during the adjustment and after the fixing.

Further, in the case of FIG. 20, the support shaft u
Since the sleeve x is interposed between the vertical guide roller g ″ and the vertical guide roller g ″, the inclination of the vertical guide roller g ″ may change after the height adjustment. That is, there is a problem in that the sleeve x may tilt in an arbitrary direction due to the play between the support shaft u and the sleeve x, and the direction may change due to an external force after the adjustment.

[0028]

In order to solve the above-mentioned problems, the tape loading mechanism of the present invention includes a first one, which is housed in a tape cassette mounted on a mechanical chassis. A tape loading mechanism for pulling a magnetic tape located on the front side from a tape cassette to a predetermined position of a recording / reproducing section by a tape loading member located inside the magnetic tape. A tape loading member that moves on the mechanical chassis is provided, and a positioning member that stops the tape loading member at the tape loading completion position is provided, and the tape loading member is rotatably supported by the mechanical chassis. Is supported by the loading arm and is separated from the rotation axis of the loading arm. The connecting portion at the open position is connected to the drive gear at a position distant from the rotation axis of the drive gear, and the loading arm is rotated with the rotation of the drive gear to move the tape loading member. The rotation shaft of the drive gear is movable with respect to the mechanical chassis, and the rotation shaft of the drive gear is urged by a resilient force to move in one direction. By further rotating the loading member even after the loading member is stopped at the tape loading completion position by the positioning member, the moving force urged by the elastic member to the drive gear is applied to the loading arm via the drive gear. The moving force is converted into a pressing force for stopping the tape loading member at the loading completion position.

The second tape loading mechanism of the present invention is a tape loading mechanism using a tape loading member in which a vertical guide roller is erected on a base member, and the vertical guide roller has a roller portion. A flange portion provided below the roller portion and a shaft portion whose height can be adjusted by screwing or unscrewing it with respect to the base member are provided, and the shaft portion of the vertical guide roller is fixed in a certain direction. The fixing means for giving the inclination is provided.

[0030]

Therefore, the first aspect of the tape loading mechanism of the present invention is as follows.
In this case, since the pressure force that brings the tape loading member into contact with the positioning member and stabilizes it can be positioned outside the movement path of the tape loading member and the member that transmits the movement force to the positioning member, the component placement Space restrictions are reduced, each member can be arranged in a plane, and the entire device can be downsized and thinned by effectively utilizing the empty space in the device.

Further, since it is possible to secure a sufficient space for arranging the elastic means for crimping the tape loading member to the positioning member, it is possible to select an elastic means of a size corresponding to the required amount of force. Therefore, it is not necessary to use a smaller elastic unit even if a component having high accuracy and high quality is used, and the device can be manufactured at a lower cost.

In the second tape loading mechanism of the present invention, by imparting a slight inclination to the shaft portion of the vertical guide roller, a proper resistance to screwing or untwisting of the shaft portion with respect to the base member is provided. Can be given, which makes it possible to perform delicate height adjustment.

Further, after the height of the vertical guide roller is adjusted with respect to the base member, the fixing means can tilt the shaft portion of the vertical guide roller so that the shaft can be surely fixed, and the vertical guide roller can be moved when the tape is running. It is possible to prevent the inclination of the roller from changing.

[0034]

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.

Before describing the tape loading mechanism 1, the tape cassette 2 used in the tape loading mechanism 1 will be briefly described.

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

In the cassette case 3, a pair of tape reels 7 and 8 in which both ends of the magnetic tape 6 are separately fixed and wound, that is, a supply-side tape reel 7 and a take-up-side tape reel 8 are freely rotatable. It is stored.

The magnetic tape 6 emerges from the tape reel 7 on the supply side, is wound around one of the guides 5 in the cassette, is drawn out of the cassette case 3, and is wound around the other guide 5 in the cassette to be inserted into the cassette case 3. The magnetic tape 6 is introduced and reaches the take-up side tape reel 8. Therefore, a part of the magnetic tape 6 is located along the front surface of the cassette case 3 while being stretched between the two guides 5 in the cassette. There is.

On the front surface of the cassette case 3, between the tape outlets 4 and 4, there is formed a recessed space 9 into which a tape pull-out member described later is inserted, that is, a so-called mouth portion.

A mechanical chassis 10 of the video tape recorder using the tape loading mechanism 1 is provided with a recording / reproducing unit 11 in which a head drum and various mechanisms described later are arranged.

Numerals 12 and 12 are positioning members provided on the left and right of the head drum behind the mechanical chassis 10, and are provided so as to be positioned at the rear ends of the guide grooves 13, 13 formed in the mechanical chassis 10. The receiving surfaces 14, 14 that a tape loading member, which will be described later, abuts, are fixed so as to face forward.

Reference numerals 15 and 15 'denote vertical guide rollers 17, 17' and inclined guides 18, 1 on the base members 16, 16 '.
8'is an upright tape loading member.

Numerals 19 and 19 'are loading arms whose tips are connected to the base members 16 and 16' of the tape loading members 15 and 15 ', and the tape loading members 15 and 15' are guided to the guide grooves by a mechanism described later. Slide along 13 and 13 in the loading and unloading directions.

The loading arms 19 and 19 'have first arm pieces 21 and 21' having supported holes 20 and 20 'formed at their base ends, and the first arm piece 2 having one end thereof.
1, 21 'are rotatably connected to the rotational ends of the tape loading members 15, 15', and the other ends are base members 16, 1 '.
Second arm pieces 22, 2 rotatably connected to 6 '
2 ', and in the vicinity of the supported holes 20, 20' of the first arm pieces 21, 21 ', engaging elongated holes 23, 23' extending radially with respect to the supported holes 20, 20 '. Has been formed.

The loading arms 19, 19 '
Supported holes 20, 20 'of the first arm pieces 21, 21' of
Are rotatably supported by support shafts 24, 24 ′ which are erected on the mechanical chassis 10.

The support shafts 24 and 24 'have a large diameter portion 24a,
24'a and small diameter portions 24b, 24'b protruding from the upper ends of the large diameter portions 24a, 24'a.
24'b is inserted through the supported holes 20, 20 'of the first arm pieces 21, 21' of the loading arms 19, 19 '.

From this, the tape loading member 1
The members for transmitting the driving force to 5, 5'will be described, but in the following description, the tape loading members 15, 1,
Of the 5'and the loading arms 19 and 19 ', those located on the left side of the head drum are referred to as members on the supply side,
A member located on the right side of the head drum is referred to as a winding-side member.

Reference numeral 25 denotes a rotation arm on the supply side, which has a deformed triangular shape in a plan view and has a supported hole 25a at its front end.
However, a circular loose fitting hole 25b is provided at the rear end portion, and a spring hook portion 25c is provided at the left end portion.

Reference numeral 26 denotes a winding arm on the winding side, which has a planar V-shape and is deformed in a V shape. The left bent portion has a supported hole 26a, and the right end portion has a circular loose fitting hole 26b. A spring hook 26c is provided at the left end. A support shaft 26d for the intermediate gear is provided upright on the right bent portion.

In the rotating arms 25 and 26 described above, supported holes 27 a and 26 a are coaxially and rotatably supported by a supporting shaft 27 erected on the mechanical chassis 10, respectively. , 26 loose fitting holes 25b, 26a
Are loosely fitted to the large diameter portions 24a and 24'a of the support shafts 24 and 24 ', respectively. As a result, the turning range of the turning arms 25 and 26 is restricted.

A cylindrical bearing portion 28 is erected from the opening edge of the loose fitting hole 25b of the supply-side rotating arm 25, and a loading gear 29 on the supply side is rotatably fitted on the bearing portion 28. It is supported.

Further, the loose fitting hole 2 of the rotating arm 26 on the winding side.
A cylindrical bearing portion 30 is erected from the opening edge of 6b, and a loading gear 31 on the winding side is rotatably supported by the bearing portion 30 in an externally fitted shape.

Reference numeral 32 denotes an intermediate gear rotatably supported by a support shaft 26d of the winding arm 26 on the winding side. A small diameter gear 32a is formed in the upper half of the intermediate gear and a large diameter gear 3 is provided in the lower half.
2b is formed, and the small diameter gear 32 of the intermediate gear 32 is formed.
a is meshed with the loading gear 31 on the winding side.

An engaging pin 33 is erected on the supply side loading gear 29 at a position apart from the support shaft 28 thereof.
An engaging pin 34 is provided upright on the winding side loading gear 31 at a position away from the support shaft 30.

The engaging pin 33 is the engaging elongated hole 23 of the first arm piece 21 of the loading arm 19 on the supply side.
And the engaging pin 34 is the loading arm 19 'on the winding side.
Are slidably engaged with the engaging elongated holes 23 'of the first arm piece 21'.

A reduction gear 35 is supported by a support shaft 27 which supports the rotating arms 25 and 26, and the reduction gear 35 meshes with the large diameter gear 32b of the loading gear 29 and the intermediate gear 32. .

As described above, the reduction gear 35 and the loading-side loading gear 29 are directly meshed with each other, and the reduction gear 35
Since the take-up side loading gear 31 and the take-up side loading gear 31 are meshed with each other via the intermediate gear 32, when the reduction gear 35 rotates, the take-up side loading gear 31 rotates and the supply side loading gear 29 rotates. The opposite is true.

Reference numerals 36 and 37 denote spring hooks provided on the rear side of the mechanical chassis 10 in the vicinity of the positioning member 12 on the supply side. The spring hooks 36 and the spring hooks 25c of the rotation arm 25 on the supply side are provided. In the meantime, tension coil springs 38 and 39 are separately stretched between the spring hooking portion 37 and the spring hooking portion 26c of the winding arm 26 on the winding side, whereby the rotating arms 25 and 26 are rotated clockwise. The turning force in the direction is energized.

As described above, the rotating arms 25 and 26
A turning force in a clockwise direction is urged to the free arm holes 25b, 26b formed in the rotary arms 25, 26.
Support shafts 24, 2 whose edges are erected on the mechanical chassis 10.
The large diameter portions 24a, 24'a of the 4'are in contact with each other to prevent further rotation in the clockwise direction.

Reference numeral 40 is a drive gear, and the mechanical chassis 10
Support shaft 41 that is erected in front of the support shaft 27 that is erected on the
It is rotatably supported by.

Reference numeral 42 denotes a control arm, which has an arcuate gear portion 43, and a base end portion 44 extending leftward from the front end of the gear portion 43 so that the base end portion 44 thereof is rotatably supported on the left front side of the mechanical chassis 10 and in the middle thereof. The arm portion 42 having the engaging pin 46 protruding from the portion 45 is integrally formed so as to have a substantially L shape when viewed in a plan view.

Gear teeth are formed on the convex arc-shaped side edge of the gear portion 43 of the control arm 42, that is, the outer edge, and the gear teeth mesh with the drive gear 40.

A cam gear 47 is rotatably supported by the mechanical chassis 10 and is rotated by a driving means (not shown). Gear teeth are formed on the outer peripheral edge of the cam gear 47, and a cam groove 48 is formed on the upper surface of the cam gear 47. Has been formed.

The cam groove 48 has a first groove 48a extending approximately 120 degrees on one circumference located near the outer periphery of the shaft center of the support shaft 49 of the cam gear 47, and a first groove. A second groove 48b extending from the counterclockwise side end of 48a toward the vicinity of the support shaft 49 of the cam gear 47, and a support shaft 49 of the cam gear 47 from the center side end of the second groove 48b.
And a third groove 48c that extends in the counterclockwise direction at an angle of about 70 degrees on one circumference centered on the axis of the center.

The engagement pin 46 of the control arm 42 is slidably engaged with the cam groove 48 of the cam gear 47,
The control arm 42 rotates with the rotation of the cam gear 47.

According to the mechanism described above, when the cam gear 47 is rotated by the driving means (not shown), the cam gear 47-
The driving force is transmitted in the order of the control arm 42-the driving gear 40-the reduction gear 35, and the driving force is transmitted from the reduction gear 35 to the supply side loading gear 29 and the winding side loading gear 31. Then, each of the loading gears 29,
The rotation of 31 drives the loading arms 19 and 19 ′ to move the loading arms 19 and 19 ′ to move the tape loading members 15 and 15 ′ along the guide grooves 13 and 13.

Reference numerals 50 and 50 'are vertical guide roller adjusting mechanisms. The vertical guide roller adjusting mechanisms 50 and 50 'are provided on the respective tape loading members 15 and 15' and have the same structure. Therefore, in the following description, the vertical guide roller adjusting mechanism provided on one of the tape loading members 15 will be described. Only the roller adjusting mechanism 50 will be described. Regarding the vertical guide roller adjusting mechanism 50 ′ provided on the other tape loading member 15 ′, the same reference numerals as those given to the similar portions of the one tape loading member 15 will be used. A detailed description thereof will be omitted by adding a symbol with "'".

The vertical guide roller 17 includes a support shaft 51,
A lower flange 52 fixed to a position approximately one-third from below the support shaft 51, an upper flange 53 fixed to the upper end of the support shaft 51, and freely rotatable between the lower flange 52 and the upper flange 53. And a roller 54 supported on the lower flange 52, and a screw shaft portion 55 is vertically provided on the lower flange 52. An engagement groove 53a is formed on the upper surface of the upper flange 53.

A support hole 56 is formed at a position apart from the position where the inclined guide 18 of the base member 16 is erected, and a cylindrical support member 57 is press-fitted and fixed in the support hole 56.

The support member 57 includes a large diameter portion 57a and a large diameter portion 57.
The support member 57 has a small-diameter portion 57b continuously provided at the lower end thereof, and the support member 57 has a support hole 58 extending vertically through the support member 57 and a screw hole 59 communicating with the support hole 58 and opening on the upper surface of the large-diameter portion 57a.
And are formed. Then, the large-diameter portion 5 of the support member 57
Most of 7a is pressed into the support hole 56 of the base member 16, and the upper end of the large diameter portion 57a is slightly projected from the upper edge of the support hole 56. The portion of the large diameter portion 57a protruding from the upper edge of the support hole 56 serves as the boss portion 60 of the base member 16.

A recess 16a into which an adjusting screw described later is inserted is formed on the upper surface of the base member 16.

Reference numeral 61 is a guide lock member, which is a plate-like member having a substantially keyhole shape. A screw hole 62 is formed at the tip of the narrow portion 61a, and the boss portion is formed at the center of the wide portion 61b. A circular loose fitting hole 63 having an inner diameter slightly larger than the outer diameter of 60.
Are formed.

A fulcrum protrusion 64 is provided on the lower surface of the wide portion 61b so that the fulcrum protrusion 64 is formed at the edge of the loose fitting hole 63 on the side opposite to the narrow portion 61a. There is. Further, the action protrusions 65, 65 are provided on the upper surface of the wide portion 61b.
Are provided so that the action projections 65, 65 are loose fitting holes 63.
The guide lock member 61 is located at the edge of the guide lock member 61 and is spaced apart in the direction orthogonal to the longitudinal direction of the guide lock member 61.
And the line segment connecting 65 to the center of the loose fitting hole
It is formed so as to pass through a position shifted to the 1a side.

Further, an adjusting screw 66 is screwed into the screw hole 62 of the guide lock member 61 so that the lower end thereof projects considerably from the lower surface of the guide lock member 61.

In order to vertically install the vertical guide roller 17 on the base member 16, first, the loose fitting hole 63 of the guide lock member 61 is loosely fitted to the boss portion 60 of the base member 16, and then the lower portion of the vertical guide roller 17 is lowered. The screw shaft portion 55 extending from the flange 52 is screwed into the screw hole 59 formed in the boss portion 60 of the base member 16.

At this time, the guide lock member 61 is prevented from coming off upward by the lower flange 52 of the vertical guide roller 17 formed to have a diameter slightly larger than the diameter of the loose fitting hole 63.

As described above, the loose fitting hole 63 of the guide lock member 61 is loosely fitted in the boss portion 60 of the base member 16, but the center of the screw hole 62 of the guide lock member 61 is formed in the recess 16a of the base member 16. When the tip of the adjusting screw 66 screwed into the screw hole 62 so as to substantially coincide with the center is positioned in the recess 16 a, the center of the loose fitting hole 63 of the guide lock member 61 becomes the center of the boss portion 60 of the base member 16. Substantially the same, the action protrusion 6
The screw hole 5 formed in the boss portion 60 is a line segment connecting 5 and 65.
It is located on the side of the opposite narrow portion 61a side from the center of 9.

Therefore, the line segment connecting the two points where the action projections 65, 65 contact the lower flange 52 of the vertical guide roller 17 does not pass through the axis of the vertical guide roller 17.

When the adjusting screw 66 is screwed into the screw hole 62 of the guide lock member 61, the action projections 65, 65 located on the upper surface of the guide lock member 61 move upward with the fulcrum projection 64 as a fulcrum. The lower flange 52 is pushed upward to increase the frictional force between the screw shaft portion 55 and the screw hole 59 to prevent the rotation of the screw shaft portion 55 of the vertical guide roller 17, and to support the support shaft 51 of the vertical guide roller 17. Are fixed to the base member 16.

Next, the procedure for adjusting the height of the vertical guide roller 17 will be described.

First, the adjusting screw 66 screwed into the screw hole 62 of the guide lock member 61 is unscrewed back so that the screw shaft portion 55 of the vertical guide roller 17 fits into the screw hole 59 of the boss portion 60 of the base member 16. The screw shaft 55 is screwed in or unscrewed, and then the screwing amount of the screw shaft portion 55 into the screw hole 59 is adjusted.

Then, the roller 5 of the vertical guide roller 17
When 4 is located at a position generally adapted to the running height of the tape, the adjusting screw 66 is narrowed down to give an appropriate resistance to the screw hole 59 of the screw shaft portion 55. The moderate resistance referred to here means that when the vertical guide roller 17 is rotated by inserting a driver into the engaging groove 53a formed at the upper end of the upper flange 53 of the vertical guide roller 17, the vertical guide roller 1
It is in a state in which there is such a resistance that the vertical guide roller 17 does not rotate easily by hand force, or the vertical guide roller 17 does not rotate by hand force.

Then, when the vertical guide roller 17 is screwed in or unscrewed to bring the roller 54 to the prescribed height, the adjusting screw 66 screwed into the screw hole 62 of the guide lock member 61 is tightened. For example, vertical guide roller 1
The support shaft 7 is fixed to the base member 16. At this time, the two contact points between the action projections 65, 65 of the guide lock member 61 pushing the vertical guide roller 17 upward and the lower flange 52 of the vertical guide roller 17 connect the two contact points. Line segment is vertical guide roller 17
The vertical guide roller 17 is slightly inclined toward the adjusting screw 66 side because it is a position passing through the side opposite to the adjusting screw 66 side with respect to the shaft center of.

Below, the tape cassette 2 is attached to the video tape recorder whose height of the vertical guide rollers 17 has been adjusted.
A description will be given of a movement until the tape is loaded and the tape loading is completed.

When the tape cassette 2 is mounted on the mechanical chassis 10 at a predetermined cassette mounting position, the tape loading members 15 and 15 'are moved to the mouse portion 9 of the tape cassette 2.
Located within.

The state shown in FIG. 1 is a state in which each member is in the initial state. When a recording or reproducing command is issued from this initial state, the cam gear 48 is moved to the position shown in FIG. 1 by the loading motor and drive mechanism (not shown). To rotate clockwise.

Even when the cam gear 48 starts to rotate, while the engagement pin 46 of the control arm 42 is in the first cam groove 48a, that is, while the engagement pin 46 is moved into the second cam groove 48b. The control arm 42 is in the initial state.

While the engagement pin 46 of the control arm 42 is moved in the second cam groove 48b toward the third cam groove 48c, the control arm 42 is rotated counterclockwise and the control arm 42 is rotated. The drive gear 40 meshed with the gear portion 43 of the control arm 42 is rotated clockwise with the rotation of the counter gear 42 in the counterclockwise direction, and the reduction gear 35 meshed with the drive gear 40 is rotated counterclockwise. It is rotated around.

When the reduction gear 35 rotates counterclockwise, the loading-side loading gear 29 meshing with the reduction gear 35 is rotated clockwise, and the winding-side loading gear 31 passes through the intermediate gear 32. Is rotated counterclockwise. Then, the supply-side first arm piece 21 is rotated clockwise, and the winding-side first arm piece 21 'is rotated counterclockwise.

Then, the second arm pieces 22 and 22 'connected to the first arm pieces 21 and 21', respectively, are extended from the folded state so as to overlap the first arm pieces 21 and 21 '. The second arm piece 22,
The tip of 22 'moves rearward, whereby the base member 16 of the tape loading member 15, 15',
16 'is moved along the guide grooves 13, 13.

As a result, the tape loading member 1
5, 15 ′ moves from the position inside the magnetic tape 6 located on the front surface of the tape cassette 2 toward the tape loading completion position. At this time, the rollers 54, 54 'of the vertical guide rollers 17, 17' provided upright on the base members 16, 16 'of the tape loading members 15, 15'.
Pulls out the magnetic tape 6 from the tape cassette 2.

When the base members 16, 16 'of the tape loading members 15, 15' move along the guide grooves 13, 13 and come into contact with the receiving surfaces 14, 14 of the positioning members 12, 12, the base members 16 , 16 'are prevented from moving further rearward by the positioning members 12, 12. However, the control arm 42 is rotated counterclockwise until the engaging pin 46 moves into the third cam groove 48c of the cam groove 48.

Then, the magnetic tape 6 is pulled out from the tape cassette 2 by a predetermined amount and a part of the pulled-out magnetic tape 6 is wound around the outer peripheral surface of the head drum, whereby the tape loading is completed.

As described above, each loading arm 1
The rotation of 9, 19 'and the rotation of the control arm 42 are stopped when the engaging pin 46 of the control arm 42 moves into the third cam groove 48c of the cam groove 48 of the cam gear 44. Before the arm 42 stops its rotation, the base members 16, 16 'of the tape loading members 15, 15' come into contact with the receiving surfaces 14, 14 of the positioning members 12, 12 to prevent their movement. , Each loading gear 2
Even if 9, 9 try to rotate the loading arms 19, 19 ', the loading arms 19, 19' cannot be rotated.

Then, the loading gears 29 and 31, which are given the rotational force by the control arm 42, have their engaging pins 33 and 34 stopped to move by the positioning members 12 and 12, respectively.
Since it engages with the engaging slots 23 and 23 'formed in the first arm pieces 21 and 21' of the loading arms 19 and 19 'connected to the base members 16 and 16' of 5 ', respectively. The force of the engaging pins 33, 34 pushing the elongated holes 23, 23 'to the right acts as a force for rotating the rotating arms 25, 26 in the counterclockwise direction, and the rotating arms 25, 26 move counterclockwise. It is rotated in the rotating direction.

By rotating the rotating arms 25 and 26 in the counterclockwise direction, the large-diameter portion 2 of the support shafts 24 and 24 'is rotated.
The left edges of the loose fitting holes 25b, 26b of the rotating arms 25, 26 that were in contact with the rotating arms 25, 26 are separated from the support shafts 24, 24 'to the left, and the spring hook portions of the rotating arms 25, 26 are provided. The tension coil spring 3 hung between 25c and 26c and the spring hooks 36 and 37 of the mechanical chassis 10.
8, 39 are stretched.

Then, the stretched coil spring 3 is stretched.
The pulling force of 8, 39 acts as a force for rotating the rotating arms 25, 26 in the clockwise direction, and the rotating arms 25, 26
The loading gears 29 and 31 cause the loading arms 19 and 19 'to rotate in the clockwise direction.
Acting toward the rear so that the second arm pieces 22, 22 'are extended from the first arm pieces 21, 21' toward the tip of the second arm pieces 22, 22 '. The base members 16 and 16 'of the connected tape loading members 15 and 15' are pressed against the receiving surfaces 14 and 14 of the positioning members 12 and 12, respectively.
15 'is stably positioned at the loading completion position.

FIG. 16 shows a modified example 15A of the tape loading member, which is different from the above-mentioned tape loading member 15 in the shape of the guide lock member and the mounting method of the guide lock member. Therefore, the vertical guide roller 17A and the inclined guide 18 are provided on the base member 16A.
Is the same as the tape loading member 15 in that the base member 16A is slid along the guide groove 13 by the loading arm 19.

The vertical guide roller 17A has a support shaft 51.
A lower flange 52A fixed to a position of approximately one third from below the support shaft 51, an upper flange 53 fixed to an upper end of the support shaft 51, a lower flange 52A and an upper flange 5
3 and a roller 54 rotatably supported between
On the lower flange 52A, a shaft portion 67 having a screw shaft portion 55A formed on the lower portion thereof is vertically provided. Also, the upper flange 53
An engaging groove 53a is formed at the upper end of the.

A supporting hole 56 is formed at a position apart from the position where the inclined guide 18 of the base member 16A is erected, and a cylindrical supporting member 57 is press-fitted and fixed in the supporting hole 56.

The support member 57 includes a large diameter portion 57a and a large diameter portion 57.
The support member 57 has a small-diameter portion 57b continuously provided at the lower end thereof, and the support member 57 has a support hole 58 extending vertically through the support member 57 and a screw hole 59 communicating with the support hole 58 and opening on the upper surface of the large-diameter portion 57a.
And are formed. Then, the large-diameter portion 5 of the support member 57
Most of 7a is press-fitted into the support hole 56 of the base member 16A, and the upper end of the large diameter portion 57a is slightly projected from the upper edge of the support hole 56. The portion of the large diameter portion 57a protruding from the upper edge of the support hole 56 is the base member 16A.
It is the boss portion 60 of the.

It should be noted that the base member 16A is provided at a substantially intermediate position between the boss portion 60 and the inclined guide 18.
A screw hole 68 that penetrates vertically through A is formed, and an adjusting screw described later is screwed into the screw hole 68.

Reference numeral 61A denotes a guide lock member. The guide lock member 61A is formed in the shaft insertion hole 69 and the base member 16A through which the shaft portion 67 located below the lower flange 52A of the vertical guide roller 17A is inserted. Screw hole 68
Screw insertion hole 71 through which the adjusting screw 70 screwed into
And are formed entirely of elastic material.

The shaft portion 67 of the vertical guide roller 17A is loosely inserted in the shaft insertion hole 69 of the guide lock member 61A.
That is, the shaft portion 67 of the vertical guide roller 17A is inserted into the shaft insertion hole 69 of the guide lock member 61A, and when the upper surface of the guide lock member 61A abuts the lower surface of the lower flange 52A of the vertical guide roller 17A, the vertical guide roller 1
The flange portion 72 is formed by caulking the portion of the shaft portion 67 of 7A located below the guide lock member 61A. At this time, the guide lock member 61A is kept from being swaged by the collar portion 72, that is, the guide lock member 61A is kept rotatable with respect to the shaft portion 67 of the vertical guide roller 17A. .

The vertical guide roller 17A and the guide lock member 61A are assembled to the base member 16A by screwing the screw shaft portion 55A of the vertical guide roller 17A into the screw hole 59 of the support member 57 fixed to the base member 16A. , The adjusting screw 70 is screwed into the screw hole 68.

The vertical guide roller 17A is adjusted and fixed as follows. That is, the vertical guide roller 17A
The height is adjusted by screwing or unscrewing the screw shaft portion 55A into the screw hole 59 of the base member 16A, and the adjustment screw 70 is screwed into the base member 16A to fix it.

The vertical guide roller 17A is attached to the base member 16
When the roller 54 is positioned at a prescribed height by screwing in or untwisting with respect to A, the guide lock member 6
The adjusting screw 70 inserted into the screw insertion hole 71 of 1A is screwed into the screw hole 68 of the base member 16A. Then, the guide lock member 61A made of an elastic material is deformed, and
As shown in FIG. 6, the portion of the lower surface of the guide lock member 61A near the screw insertion hole 71 of the shaft insertion hole 69 is the flange 72.
The upper portion of the guide lock member 61A is elastically contacted with the lower flange 52A at a portion in the vicinity of the anti-screw insertion hole 71 of the shaft insertion hole 69 on the upper surface of the guide lock member 61A.
9 to prevent rotation of the screw shaft portion 55A of the vertical guide roller 17A, the support shaft 51 of the vertical guide roller 17A is fixed to the base member 16A, and the vertical guide roller 17 is slightly Inclining to the adjustment screw 66 side.

When the height of the vertical guide roller 17A is adjusted, the screwing amount of the adjusting screw 70 with respect to the screw hole 68 is adjusted to provide an appropriate resistance to the rotation of the screw shaft portion 55A with respect to the screw hole 59. You just have to join.

[0109]

As is apparent from the above description, the tape loading mechanism of the present invention includes the first one, which is housed in the tape cassette mounted on the mechanical chassis and is located at the front portion of the tape cassette. A tape loading mechanism for pulling the magnetic tape, which is located inside thereof, out of the tape cassette by a tape loading member and moving it to a predetermined position of the recording / reproducing section. And a positioning member for stopping the tape loading member at a tape loading completion position, and the tape loading member is supported by a loading arm rotatably supported by the mechanical chassis, At a position away from the rotation axis of the loading arm The connecting portion is connected to the drive gear at a position distant from the rotation axis of the drive gear, and the loading arm is rotated with the rotation of the drive gear to move the tape loading member in the loading and unloading directions. The rotating shaft of the drive gear is movable with respect to the mechanical chassis, and the rotating shaft of the drive gear is urged to move in one direction by elastic means, so that the driving gear is completely loaded. Sometimes the tape loading member further rotates after being stopped at the tape loading completion position by the positioning member, so that the moving force biased by the driving gear by the elastic means is applied to the loading arm via the driving gear, To convert the above-mentioned moving force into a pressing force for stopping the tape loading member at the loading completion position. Characterized in that way the.

The second tape loading mechanism of the present invention is a tape loading mechanism using a tape loading member in which a vertical guide roller is erected on a base member, and the vertical guide roller has a roller portion. A flange portion provided below the roller portion and a shaft portion whose height can be adjusted by screwing or unscrewing the base member are provided, and the shaft portion of the vertical guide roller is fixed in a certain direction. It is characterized in that a fixing means for giving an inclination of is provided.

Therefore, according to the first aspect of the tape loading mechanism of the present invention, the moving path of the tape loading member and the member for transmitting the moving force to the pressure loading force for bringing the tape loading member into contact with the positioning member and stabilizing it. Since it can be located outside, there are less restrictions on the space for arranging parts, and each member can be arranged in a plane. By effectively utilizing the empty space inside the device, the overall size and size of the device can be reduced. Can be realized.

Further, since it is possible to secure a sufficient space for arranging the elastic means for crimping the tape loading member to the positioning member, it is possible to select an elastic means of a size suitable for the required amount of force. Therefore, it is not necessary to use a smaller elastic unit even if a component having high accuracy and high quality is used, and the device can be manufactured at a lower cost.

According to the second tape loading mechanism of the present invention, the push-up member is brought into contact with the flange portion of the vertical guide roller so that the shaft portion can be appropriately screwed into or unscrewed from the base member. It is possible to provide resistance, which makes it possible to make fine height adjustments.

Further, after the height of the vertical guide roller is adjusted with respect to the base member, the fixing means tilts the shaft portion of the vertical guide roller in a certain direction so that the tape can be securely fixed. It is possible to prevent the inclination of the vertical guide roller from changing during traveling.

The shapes and structures of the respective portions shown in the above-mentioned embodiments and modified examples are merely examples of the embodiment in carrying out the present invention, and the technical scope of the present invention is thereby provided. It should not be construed as limiting.

[Brief description of drawings]

FIG. 1 shows an example of an embodiment of a tape loading mechanism of the present invention together with FIGS. 2 to 15, and is a plan view showing the whole before tape loading.

FIG. 2 is a plan view showing the entire structure after tape loading.

FIG. 3 is a view showing the action of the rotating arm on the loading arm together with FIG. 4, and is a plan view before the action.

FIG. 4 is a plan view after the operation.

5 shows a transmission system from the loading gear to the vertical guide roller together with FIG. 6, and this figure is a vertical sectional view showing the transmission system on the supply side.

FIG. 6 is a vertical sectional view showing a transmission system on the winding side.

FIG. 7 is a cross-sectional view showing a relationship between a drive gear and a reduction gear.

FIG. 8 is a sectional view showing a relationship between a rotating arm and a tension coil spring.

FIG. 9 shows the tape loading member together with FIGS. 10 to 15, and is an exploded perspective view of the tape loading member on the supply side.

FIG. 10 is an exploded perspective view of the tape loading member on the winding side.

FIG. 11 is a vertical sectional view.

FIG. 12 is a side view showing a state in which a vertical guide roller is not fixed before being partially cut away.

FIG. 13 is a side view showing a state in which a vertical guide roller is fixed and a part of which is cut away.

FIG. 14 is a plan view of a guide lock member.

FIG. 15 is a side view showing a part of a main part cut away.

FIG. 16 is a vertical sectional view showing a modified example of the tape loading member.

FIG. 17 is a plan view showing an example of a conventional tape loading mechanism.

FIG. 18 is a sectional view showing a main part of an example of a conventional loading arm.

FIG. 19 is a vertical sectional view showing a main part of an example of a conventional tape loading member.

FIG. 20 is a vertical cross-sectional view showing the main parts of another example of the conventional tape loading member.

[Explanation of symbols]

 1 Tape Loading Mechanism 2 Tape Cassette 6 Magnetic Tape 10 Mechanical Chassis 11 Recording / Reproducing Section 12 Positioning Member 15, 15 'Tape Loading Member 16, 16' Base Member 17, 17 'Vertical Guide Roller 19, 19' Loading Arm 23, 23 ′ Engaging slot (connecting part) 24, 24 ′ Support shaft (rotating fulcrum) 25 Rotating arm 26 Rotating arm 28 Bearing part (rotating shaft) 29 Loading gear (driving gear) 30 Bearing part (rotating shaft) 31 Loading gear (driving gear) 33 Engaging pin (connecting portion) 34 Engaging pin (connecting portion) 38 Tensile coil spring (resilient means) 39 Tensile coil spring (resilient means) 52, 52 'Lower flange (flange portion) 54, 54 'Roller (roller part) 55, 55' Screw shaft part (shaft part) 61, 61 'Guide lock member (push-up) Material) 61a, 61'a Narrow part (push-up adjustment part) 61b, 61'b Wide part (push-up part) 62, 62 Screw hole 63, 63 'Free fitting hole 65, 65' Working protrusion 66 Adjusting screw 15A Tape Loading member 17A Vertical guide roller 52A Lower flange (flange part) 55A Screw shaft part (shaft part) 70 Adjustment screw

Claims (8)

[Claims] 1. A predetermined recording / reproducing unit for pulling out a magnetic tape housed in a tape cassette mounted on a mechanical chassis and located on the front surface of the tape cassette from a tape cassette by a tape loading member located inside the tape cassette. And a tape loading member for moving the recording / reproducing unit and the mechanical chassis is provided on the mechanical chassis, and the tape loading mechanism is configured to stop the tape loading member at the tape loading completion position. A tape loading member is supported by a loading arm that is rotatably supported by the mechanical chassis, and a connecting portion located away from the rotation axis of the loading arm is located away from the rotation axis of the drive gear. Is connected to the drive gear with the The tape arm is rotated to move the tape loading member. The rotation shaft of the drive gear is movable with respect to the mechanical chassis, and the rotation shaft of the drive gear is supported by the elastic means. The moving force is applied to the drive gear by the elastic means so that the drive gear is further rotated after the tape loading member is stopped at the tape loading completion position by the positioning member when the loading is completed. The tape loading, wherein the urged moving force is applied to the loading arm via the drive gear, thereby converting the moving force into a pressing force for stopping the tape loading member at the loading completion position. mechanism. 2. A drive gear is rotatably supported by a rotary arm rotatably supported on a mechanical chassis, and a tension coil spring is stretched between the rotary arm and the mechanical chassis.
2. The tape loading mechanism according to claim 1, wherein the tension coil spring is an elastic means for urging a moving force of the tension coil spring to a rotation shaft of a drive gear. 3. An engagement pin is provided at an eccentric position of a drive gear, and the engagement pin is engaged with an engagement elongated hole formed at a position apart from a rotation fulcrum of a loading arm. 3. The connecting portion for transmitting the driving force from the driving gear to the loading arm, according to claim 1 or 2.
The tape loading mechanism described in. 4. A tape loading mechanism using a tape loading member in which a vertical guide roller is erected on a base member, wherein the vertical guide roller has a roller portion and a flange portion provided below the roller portion. The base member is provided with a shaft portion whose height can be adjusted by screwing the screw into or out of the base member, and a fixing means which tilts the shaft portion of the vertical guide roller in a certain direction. Tape loading mechanism. 5. The fixing means contacts the flange portion of the vertical guide roller from below and pushes the flange portion upward at a position slightly offset from the axial center of the vertical guide roller so as to be fixed to the axial portion of the vertical guide roller. The tape loading mechanism according to claim 4, wherein the tape loading mechanism is a push-up member capable of giving a tilt in a direction. 6. The push-up member includes a push-up portion and a push-up adjusting portion and is arranged on the base member, and the push-up member has a loose fitting hole externally fitted to the shaft portion of the vertical guide roller and the periphery of the loose fitting hole. A pair of action protrusions projecting upward at the portion, and the push-up adjusting portion is provided with a screw hole and an adjusting screw capable of adjusting the amount of downward projection from the push-up member by being screwed into the screw hole. ,
The point of contact of the adjusting screw with the base member is the point of force. When the adjusting screw is screwed in, the upper surface of the action projection contacts the flange of the vertical guide roller from below, and the shaft of the vertical guide roller. It has a structure that pushes up
The tape loading mechanism according to claim 5, wherein the pair of action protrusions are provided so that a line connecting the action points does not pass through the axis of the vertical guide roller. 7. The elastic means comprises an elastic pressing plate in which the elastic contact part and the elastic contact adjusting part are integrally formed of an elastic material, and an adjusting screw inserted into the elastic contact adjusting part of the elastic pressing plate. The elastic portion of the pressing plate is positioned outside between the flange portion of the vertical guide roller and the flange portion formed on the shaft portion, and the adjusting screw is screwed into a screw hole formed in the base member. Causes the elastic pressing plate to bend so that the elastic contact adjusting portion moves toward the base member side, and by this bending, one edge of the upper surface of the elastic contact portion is on the lower surface of the flange portion of the vertical guide roller and the lower surface of the elastic contact portion. The one edge of each elastically contacts the upper surface of the flange portion, and the two elastically contacting portions are located at positions facing each other with the axial center of the vertical guide roller interposed therebetween. Tape loading mechanism. 8. The screwing direction of the vertical guide roller with respect to the base member is the same as the screwing direction of the adjusting screw provided in the push-up adjusting section.
Alternatively, the tape loading mechanism according to claim 7.