JPS6314364A - Recording medium loading mechanism - Google Patents

Abstract

PURPOSE:To correct a phase shift automatically even should a phase shift be caused between the moving distances of two racks so as to try to move a recording medium carrier member again by providing a tooth missing part to one of the two racks. CONSTITUTION:If a phase shift is caused between racks 9, 9' when a cassette carrier 7 falls on a loading end position, since the cassette carrier 7 is descended with a tilt attitude, only a detection switch 82 outputs a prescribed signal. Then a motor is reversed to restore the cassette carrier 7 to the eject position. When the cassette carrier 7 rides on a horizontal part of its moving locus, a tooth missing part 78 formed to the right side rack 9' is opposed to the right side feed gear 11' soon and the right side rack 9' is released from the meshing with the feed fear 11' temporarily. Then the cassette carrier 7 is moved by just one pitch backward by the backward moving torque, the phase between the left/right racks 9, 9' is arranged and the cassette carrier 7 is moved to the eject position in such a state.

Description

DETAILED DESCRIPTION OF THE INVENTION The recording medium loading mechanism of the present invention will be explained according to the following items.

A. Industrial field of application B1 Overview of the invention C0 Background art [Figures 10 and 11 D3 Problems to be solved by the invention [Figures 10 and 11]
] Means F for solving the E1 problem, Example a, Outline of VTR [Figs. 2 to 5, and 8] b. Support body [Figs. [Figures 3 to 5, Figure 8 (d), Tape cassette loading mechanism [Figures 1 to 9]
Figure d-1, Drive part [Figure 3 d-2, Sliding body [Figures 2 to 6, Figure 8] d-2-a, Main part [Figure 2 to Figure 6, Figure 8] Figure 8 d-2-b, Force carrier support means Figures 3, 4, and 6] d-3 Cassette carrier [Figures 1 to 5, Figures 7 to 9] d -3-a, Cassette mounting plate [Fig. 1 to 3, Fig. 5, Fig. 7, Fig. 8] d-3-b, Side plate [Fig. 1 to 4, Fig. 7 to [Fig. 9] d-3-c, rack [Fig. 1, Fig. 4, Fig. 7 to Fig. 9] d-3-d Lid [Fig. 7, 8] d-3-e, Support of the cassette carrier [Figs. 2 to 4, 8, 9 d-4, 8 ribs of the cassette carrier and sliding body d-4- a Movement in the loading direction d-4-b, hyperactivity in the unloading direction d-5, detection switch [Fig. 8] d-6, operation for correcting the phase shift of the cassette carrier rack [Fig. 8, Figure 9] d-7, Loading operation and unloading operation of tape cassette d-7-a Loading operation d-7-b, Unloading operation G Effects of the invention (A. Industrial application field) The present invention is novel. This invention relates to a recording medium loading mechanism. Specifically, the eight parts are freely supported on the support body, are moved between the eject position and the loading completion position, are spaced apart from each other in a direction perpendicular to the movement direction, extend along the movement direction, and are supported on the support side. The recording medium transport member has two racks that mesh separately with two feed gears, and is moved by the rotation of the feed gears. A recording medium loading mechanism that moves the recording medium conveying member to the loading completion position with the recording medium loaded on the member, for example, a so-called linear skating system, in which loading of a tape cassette or magnetic disk cassette is performed. This relates to the recording medium loading mechanism in tape recorders, disk players, etc., in which recording media is loaded, and by improving the structure of the rack of the recording medium transport member, even if there is a misalignment between the two racks, the recording medium can be easily loaded. The present invention is intended to provide a novel recording medium loading mechanism 13 in which the above-mentioned phase shift is automatically corrected by redoing the eight shifts of the medium conveying member.

(B. Summary of the Invention) The recording medium loading mechanism of the present invention is movably supported on a support body, moves between an eject position and a loading completion position eight times, and is positioned spaced apart from each other in a direction orthogonal to the moving direction. The recording medium conveying member has two racks each of which is aligned with two feed gears that extend along the moving direction and are supported on the support side, and that is moved by the rotation of the feed gears. In the recording medium loading mechanism according to the present invention, by providing a toothless portion on one of the two ranks, even if a phase shift occurs between the movements of the two racks, the recording medium conveying member can be repositioned. The above phase shift is automatically corrected.

(c. Background Art) [Figures 10 and 11] Recently, recording media such as magnetic tapes and magnetic disks used in recording and reproducing systems are stored in predetermined cassette cases such as tape cassettes and electronic disk cassettes. There are many things.

In addition, recording/playback equipment that uses these recording media has
Usually, a recording medium loading mechanism is provided that includes a recording medium transport member that is moved between an eject position where the recording medium is loaded and unloaded and a loading completion position where the recording medium is loaded into the recording/playback section. The recording medium is mounted on the recording/reproducing section by moving the recording medium conveying member to a loading completion position with the recording medium placed on the recording medium conveying member.

There have been various types of recording medium loading mechanisms, one of which is a mechanism that extends along the direction of movement of the recording medium conveyance member and extends in a direction orthogonal to the eight directions of movement. There is a system in which two racks are provided that are separately engaged with two feed gears that are positioned apart from each other and are supported on the support side, and the recording medium conveying member is moved when the feed gears are rotated. .

FIGS. 10 and 11 schematically show m pieces a of such a tape cassette loading mechanism with two racks and two feed gears.

In the figure, b is a sliding body supported on the side of the outer casing C (only a part of its front plate is shown in the drawing) so as to be movable in the front and back direction, and the cassette carrier d is attached to the sliding body. It is supported so that it can move freely in the vertical direction.

The cassette carrier d includes two side plates e and e'' located apart from each other in the left and right direction, and a cassette mounting plate f whose left and right sides are attached to the two side plates e and e', The side plates e and e' are supported so as to be able to slide vertically on the sliding body.Furthermore, on the bottom and front surfaces of the side plates e and e', there are racks g extending continuously between these two surfaces. g' is formed, and the racks g and g' are meshed with two feed gears h and h' supported on the outer IC side.

Note that the feed gears h and h' are fixed to both ends of a rotating shaft i rotated by a motor.

Then, the cassette carrier d has come to the eject position where it protrudes outside the outer casing C when the rear end of the rack g1g' is engaged with the feed gears h and h'. By rotating counterclockwise in FIG. 10, rack g , the upper end of g' is the feed gear h,
In the state in which the tape cassette j placed on the cassette ll12 mounting plate f is engaged with the tape cassette h, the loading completion position is reached where the tape cassette j placed on the cassette 112 is mounted on the recording/reproducing section.

Note that the sliding body is pushed by the cassette carrier d while the cassette carrier d is moved along the horizontal part of its movement locus, and when the cassette carrier d comes to the eject position, almost all of the sliding body touches the front plate k of the outer casing C. When the cassette carrier d is moved from the eject position to the bending point position of the sideways letter shape of the movement trajectory, the front surface of the cassette carrier d reaches the opening l formed in the opening l. The retracted position is reached in such a way as to close the area.

(D Problems to be Solved by the Invention) [Figs. 10 and 11 Since the tape cassette loading mechanism a shown in Figs. 10 and 11 is configured as described above, for example, the sliding body If the slider is forcibly pushed into the outer casing C from the state where the cassette carrier d is in the drawer position, the racks g and g' of the cassette carrier d will move into the feed gears h and h'.
The racks g, g' will be pushed backwards while rotating against the load of the motor.
However, it may happen that the teeth of the feed gears h, h' are centered on one or more of the teeth of the feed gears h, h'.

In this case, the number of times the left rack g has passed over the teeth of the left feed gear h is the same as the number of times the right rack 8' has passed over the teeth of the right feed gear h'. In this case, there is no phase shift between the two racks g and g', but if the numbers of racks g and g' that have passed through the feed gears h and h' are different, the phase difference between the left and right racks g and g' will be different. The phase of will be shifted.

Then, when the cassette carrier d is located in the horizontal part of the movement trajectory, the positions of the two side plates e and e' are shifted in the front and back direction, and when it is located in the vertical part of the movement trajectory, 11, the two side plates e and e are in a vertically shifted position as shown by the two-dot chain line in FIG.

Therefore, when cassette carrier d is moved to the third loading completion position in this state, tape cassette j
Since the tape cassette J will arrive at the recording/playback section in an inclined position with both sides shifted vertically, the tape cassette J will be placed in the specified cassette position in the recording/playback section, with no bag attached to the neck. Therefore, if tape loading is performed in such a state, various troubles will occur with the tape loading mechanism, the magnetic tape being pulled out from the tape cassette J, etc.

Furthermore, once a phase shift occurs between the racks g and g', it is extremely difficult to correct this phase shift without disassembling the tape cassette loading mechanism a.

(E. Means for Solving the Problems) In order to solve the above problems, the recording medium loading mechanism of the present invention has one or more teeth removed from one of the two racks of the recording medium transport member. It has a tooth-missing part.

Therefore, according to the present invention, if a phase shift occurs between the two racks at the point where the feeding gear meshes with the feed gear, the recording medium conveyance member or the members constituting it will be distorted against the rigidity thereof. Since the two racks generate 8 forces in opposite directions, in this state, the recording medium conveying member is re-extended, and the tooth-missing portion formed on one rack is connected to the one feed gear. When the two racks reach the opposite position, one rack is released from engagement with one of the feed gears, and is automatically moved to a position where the two racks are in phase with the other rack by the force of the force.

(F. Embodiment) Details of the recording medium loading mechanism of the present invention will be described below according to the embodiment shown in the accompanying drawings.

The embodiment shown in the drawings is a video tape recorder (hereinafter referred to as rVTRJ) in which the recording medium loading mechanism of the present invention is used as a cassette loading method using a so-called linear skating method.
Say. ) is used in the tape cassette loading mechanism.

(a. Overview of VTR) [Figures 2 to 5, Figure 8 1 is a VTR.

2 is the outer casing of the VTRI, and its front panel 3 is an operation panel with a predetermined display window and operation buttons that have been outdated.
Also, in the left-right direction (in Figure 2, the direction diagonally downward to the left is the left side, and the direction diagonally upward to the right is the right side. In addition, the direction diagonally downward to the right in the same figure is the front side, and the direction diagonally upward to the left in the same figure is the front side. An elongated opening 4 is formed in the direction (the direction is the rear side. In the following description, directions will be referred to in this direction).

Reference numeral 5 denotes a sliding body supported so as to be slidable in the front and back direction on a support 6 fixed at a position substantially corresponding to the opening 4 in the outer casing 2, and a cassette carrier 7 is mounted on the sliding body 5. It is supported so that it can move freely up and down.

On the bottom and front end surfaces of the left and right side plates 8.8' of the cassette carrier 7, racks 9 are provided which extend continuously to the two surfaces.
．． 9' are formed and these racks 9.9' are meshed with a feed gear 11.11' rotated by a drive 10 provided on the support 6, and the cassette carrier 7 is connected to the racks 9.9'. 9' is moved horizontally by the feed gear 11, 11' to move it in the front-rear direction, and by being sent vertically, it is moved up and down.

Furthermore, while the cassette carrier 7 is being moved in the front-back direction, the sliding body 5 is moved in the front-back direction integrally with the cassette carrier 7, and thereby, as shown by the thin two-dot chain line in FIG. A position where the front end surface closes the opening 4 formed in the outer casing 2 (hereinafter referred to as the "retracted position").
As shown in FIGS. 2, 3, and 5, and as shown by the thick two-dot chain line in FIG. ).

When the sliding body 5 of the cassette carrier 7 reaches the pulled-out position, most of the cassette carrier 7 is placed outside the outer casing 2, that is, on the left and right side plates 8. 8' and the entire cassette mounting plate 12 forming the bottom of the cassette carrier 7 reach a position outside the outer casing 2 (hereinafter referred to as the "eject position"), and the sliding body 5 is in the retracted position, and when it reaches the lower end of the 8th stroke in the vertical direction, it is shown by the thin two-dot chain line in FIGS. The position indicated by the solid line in Figure 8, that is, the cassette mounting plate 1
The tape cassette 13 placed on the tape cassette 2 reaches a position (hereinafter referred to as the "r loading completion position") where the tape cassette 13 placed on the tape cassette 13 is mounted on a recording/reproducing section, which will be described later.

Therefore, the cassette carrier 7 moves eight times along a substantially horizontally tilted eight-turn trajectory, and the tape cassette 13 is placed on and taken out from the cassette carrier 7 while the cassette carrier 7 is at the eject position. Then, with the tape cassette 13 placed on the cassette carrier 7, the cassette carrier 7 is moved to the loading completion position, whereby the tape cassette 13 is loaded into the recording/reproducing section.

(b, Support) [Figures 3 to 5 The support body 6 consists of a lower chassis and an upper chassis.

14 is a lower chassis. The lower chassis 14 consists of a main part 15 formed in a substantially plate shape, a rear wall 16 formed upright from the rear end of the main part 15, a front wall and left and right side walls (not shown), and when viewed as a whole, It is formed into a substantially box-like shape with an open top surface.

17 is an upper chassis. The upper chassis 17 has a substantially square shape that is approximately one size larger than the outer shape of the lower chassis 14, and is formed into a substantially frame by the front piece 18, the rear piece 19, the gull 20, and the stone piece 21 that form the four sides of the square. It is formed in the shape of The rear end portions of the gull 20 and the stone piece 21 are positioned so as to protrude rearward from the rear piece 19, and the rear end of the gull 20 is located slightly rearward than the rear end of the stone piece 21. A guide shaft support piece 22, 22' (see FIG. 3) is formed at the end to protrude downward.

Further, the gull 20 and the stone piece 21 are formed with side pieces 23 and 23' (only their front ends are shown in FIG. 3) bent downward from their outer edges, and The front end portions of the side pieces 23, 23' are formed into guide shaft support pieces 23a, 23'a bent inward in an abbreviated shape.

24.24' is a guide shaft for slidably supporting the sliding body 5, and the rear end of the guide shaft 24.24' is supported by the rear guide shaft support piece 22.22'. The front end is supported by the front guide shaft support pieces 23a, 23'a, and therefore these two guide shafts 24, 24'
are arranged on both left and right sides of the upper chassis 17 so as to extend in the front and back direction.

25 (see FIG. 3) is a coil spring fitted onto the rear end of the left guide 1124. The action of this coil spring 25 will be described later.

26 is a crosspiece, and both left and right ends of the crosspiece 26 are connected to the right piece 20 and the stone piece 21.

As can be clearly seen from FIG. 3, among the mutually opposing side edges of the right piece 20 and the stone piece 21, the rear part of the part between the rear piece 19 and the crosspiece 26 protrudes more inward than the other parts. A guide piece 27.27' bent downward at a substantially right angle is formed in that part, and the front side edges 27a, 27'a of the guide piece 27.27' As shown in the figure, it is formed into a substantially inverted shape when viewed from the side. Note that this guide piece 27, 27' is attached to the cassette carrier 7.
This is a member for guiding the movement direction of the cassette carrier 7 when the movement in the front-rear direction and the movement in the up-down direction are continuous.

The upper chassis 17 configured in this manner has its rear piece 19 placed on the upper end of the rear wall 16 of the lower chassis 14 and screwed onto the rear wall 16, and its side pieces 23. The mounting pieces 23b and 23'b formed near the front end of the lower chassis 14 are fixed to the lower chassis 14 by being screwed to the mounting pieces formed at the upper end of the side wall (not shown) of the lower chassis 14. Ru.

As a result, the lower chassis 14 and the upper chassis 17 are combined, and the supporting body 6 having a substantially box shape as a whole is formed by warping, and two guides i ! th24.24' will be placed.

Incidentally, an opening approximately the same size as the opening 4 formed in the outer casing 2 is defined between the front wall (not shown) of the lower chassis 14 and the front piece 18 of the upper chassis 17. is arranged such that its opening approaches and opposes the opening 4 of the outer casing 2 from the rear side, and is fixed to the outer casing 2.

(c, recording/reproducing section) [Figures 3 to 5, Figure 8 28 is a recording/reproducing section.

Reference numeral 29 denotes a mechanical chassis that serves as the base of the recording/reproducing section 28. The mechanical chassis 29 is fixed to the upper surface of the main portion 15 of the lower chassis 14 of the support 6, and has a rotating magnetic head (not shown) approximately at the center of the rear thereof. Head drum 30 equipped with
is provided, and two reel stands 31, 31 are located near the front end of the reel stand and are spaced apart from each other in the left and right direction.
' is provided. 31a and 31'a are reel stands 31
．． 31' is the reel engaging shaft.

Four cassette positioning bins 32, 32' and 33.33' are erected at the front of the mechanical chassis 29, and these four cassette positioning bins 32, 32'
The two rear cassette positioning bins 32, 32' of the cassette positioning bins 33, 33' have a substantially conical insertion portion 32a at their upper ends.
, 32'a are formed, and the two front cassette positioning bins 33 and 33' are located near the front edge of the mechanical chassis 29, and the tape cassette 13 has a cassette case 34 that positions these cassettes. bottle 32
．． 32' and 33.33', the height relative to the recording/reproducing unit 28 is defined, and the rear cassette positioning bin is inserted into two positioning holes (not shown) formed on the bottom surface of the gusset case 34. By inserting the insertion portions 32a and 32'a of 32 and 32', the recording/reproducing section 28 is positioned in the horizontal direction.

Reference numeral 35 denotes a misplaced rotating bin, and the misplaced rotating bin 35 extends approximately toward the right from the upper end of a support piece 36 that is erected from approximately the center of the left side of the mechanical chassis 29 in the front-rear direction. It is provided so as to protrude horizontally, and is located at approximately the same height as the bottom surface of a left-behind hole, which will be described later, provided on the cassette carrier 7 when the cassette carrier 7 is located on its horizontal movement locus. .

(d. Tape cassette loading mechanism) [Figures 1 to 9] 37 is a tape cassette loading mechanism, and the tape cassette loading mechanism 37 moves the sliding body 5 and the cassette carrier 7, and the cassette carrier 7. It consists of a drive unit 10, cassette holding means, etc.

(d-1, drive unit) [Figure 3] 38 is a motor, and the motor 38 is connected to the lower chassis 14.
The drive pulley 39 is fixed to the rotating shaft 38a of the rear end inner surface of the left side wall (not shown).

Reference numeral 40 denotes a reduction pulley having a considerably larger diameter than the drive pulley 39, and the reduction pulley 40 is integrally formed with a gear portion 41 located on the right side thereof, and protrudes substantially horizontally from the lower chassis 14. It is rotatably supported by a pulley support shaft 42, and an endless transmission belt 43 is stretched between the reduction pulley 40 and the drive pulley 39.

44 and 45 are reduction gears located in front of the gear portion 41 of the reduction pulley 40, and these two reduction gears 4
4 and 45 are separately and rotatably supported by gear support shafts 46 and 47 protruding from the left side wall of the lower chassis 14, and the rear reduction gear 44 is a large gear having a relatively large diameter. 44a and a small gear 44b having a relatively small diameter located on the right side of the large gear 44a are integrally formed, and the large gear 44a meshes with the gear portion 41 of the reduction pulley 40, and the small gear 44b is meshed with the front reduction gear 45.

When the motor 38 rotates, the rotation is transmitted to the front reduction gear 45 through the transmission path of reduction pulley 39 - transmission belt 43 - reduction pulley 40 and its gear section 41 - rear reduction gear 44. , during such transmission, the rotational speed will be reduced to a predetermined rotational speed.

48 is a rotation axis. Most of the rotating shaft 48 is rotatably supported by a rotating shaft support member (not shown) provided on the front wall (not shown) of the lower chassis 14, and the feed gears 11, 11' are located near both left and right ends of the rotating shaft 48. are fixed separately, and furthermore, a driven gear 49 is fixed to the left end thereof, and the driven gear 49 meshes with the reduction gear 45 on the front side.

Therefore, when the motor 38 rotates, the driven gear 49 is rotated, so that the rotating shaft 48 is rotated, and thereby the feed gear 11.11' is rotated.

The motor 38 rotates clockwise when viewing the VTRI from the left side when loading is performed, moving the cassette carrier 7 six times from the eject position to the loading completion position, and also rotates the cassette carrier 7 from the loading completion position. When unloading to the eject position is performed, the rotation is counterclockwise. Accordingly, the feed gear 11,11' is rotated counterclockwise when loading is performed, as viewed from the left side of the VTRI, and is rotated clockwise when unloading is performed.

(d-2, sliding body) [Figs. 2 to 6, 8] (d-2-a, main part) [Figs. 2 to 6, 8] the parts are spaced apart from each other in the left-right direction, and
Two side plates 50, 50' facing each other substantially parallel to each other and the side plate 5
The front plate 51 connecting the front ends of 0.50' is formed to form a substantially U-shape that is long in the front-rear direction when viewed from the top and bottom, and its width, that is, the distance between the outer surfaces of the side plates 50 and 50'. The length is approximately equal to the length in the left-right direction of the opening 4 formed in the outer casing 2, and the length in the front-rear direction is approximately the same as the length in the front-rear direction of the upper chassis 17. It has a length.

The side plates 50 and 50' are formed so that their cross-sectional shapes form a substantially U-shape that opens inwardly, and the left side plate 50 is slightly longer than the right side plate 50'.

A reinforcing material 52 is provided in the shape of a bridge between the upper pieces 50a, 50'a of the side plates 50, 50' in the front-rear direction, and a reinforcing member 52 is provided near the front end of the upper pieces 50a, 50'a. There is a concave portion 53 having a substantially inverted trapezoidal shape when viewed from the left and right directions.
．． 53' is formed.

An insertion portion 54 protruding outward is formed at the upper part of the outer surface of the U-shaped intermediate piece 50b of the left side plate 50 at approximately one-third of the rear end. Insertion holes 55.55 are formed at both front and rear ends of the portion 54.

In addition, in substantially the same way, an insertion hole protruding outward is also provided in the upper half of the approximately one-third portion of the outer surface of the U-shaped intermediate piece 50'b of the right side plate 50' near the rear end. A portion 54' is formed, and an insertion hole 55' is formed in the insertion portion 54'.

The sliding body 5 is connected to the two wooden guide shafts 24 supported by the upper chassis 17 in the insertion holes 55, 55 and 55'.
．． 24' is slidably inserted into the support body 6.
The third
As can be clearly seen from the figure, the front end surface of the insertion portion 54, 54' is brought into contact with the guide shaft support pieces 23a, 23'a of the side pieces 23, 23' of the upper chassis 17, so that the insertion portion 54, 54' is moved from the drawn-out position. The 8th shift forward will be blocked (d-2-
b, cassette carrier support means) [Figures 3, 4, and 6] 56.56 and 56'56'' (see Figures 3 and 6) are intermediate pieces 50b, 50 of the side plates 50.50' These two protrusions 56, 56 and 56 are protrusions formed approximately at the central part in the front-rear direction of the inner surface of the 'b, so as to be opposed to each other in the front and rear directions and to extend along the vertical direction. ′,
A guide groove 57.56' extends along the vertical direction.
57' are formed, and these guide grooves 57.57'
The lower end is opened in the lower piece 50C150'c of the side plate 50.50'.

Also, 58.58' is the intermediate piece 50b of the side plate 50.50'.
, 50"b, the guide grooves 57 and 57' are formed on the inner surface of the front end.
The guide groove 58, 58' is a guide groove formed to extend in the vertical direction and has approximately the same structure as the guide groove 58, 58'.
The lower ends of the lower pieces 50c and 50'c are also opened.

Incidentally, the above-described guide grooves 57, 57' and 58, 58' are slidably engaged with engaging portions, which will be described later, formed on the cassette carrier 7, so that the cassette carrier 7
is supported by the sliding body 5 so as to be movable vertically.

5, 59' is a rotating shaft having a length of about one-third of the side plate 50.50', and pinion gears 60.60, 60', 60' are provided at both ends of the rotating shaft 59.59'. The rotating shaft 59.59' is fixed, and the front one of the pinion gears 60.60 and 60', 60' is connected to the rotating shaft 59.59'.
60' is located at a position of the lower end of the inner surface of the side plate 50.50' that corresponds to a position slightly rearward from the front guy F i:i 58.58'.
Bearing portions 61, 61, . . . formed on the inner surface of 50'
(In the drawing, only the one formed on the right side plate 50' is shown.) It is rotatably supported.

The pinion gears 60, 60, 60', and 60' are positioned so that part of their outer circumferential surface slightly protrudes from the inner end of the side plate 50, 50'.

(d-3, Cassette Carrier) [FIGS. 1 to 5, FIGS. 7 to 9] The cassette carrier 7 has a cassette mounting plate 12 on which a tape cassette 13 is mounted, and a cassette mounting plate 12 on which a tape cassette 13 is mounted. It consists of two side plates 8, 8' located on the left and right sides, a lid for opening and closing the front surface M62 of the tape cassette 13, and the like.

(d-3-a, cassette mounting plate) [Figures 1 to 3,
5, 7, and 8] The cassette mounting plate 12 is formed into a substantially rectangular plate shape that is long in the left-right direction when viewed as a whole, and its size is as shown in FIG. As can be seen clearly, the external shape is approximately the same as that of the cassette case 34 of the tape cassette 13.

A notch 63 is formed in a portion of the cassette mounting plate 12 other than both left and right ends near the rear end, and positioning pieces 64 and 64 project upward from both left and right ends of the rear end. ' is formed, and the left and right corners of the front end are cut out in the shape of an abbreviation, and the front end is bent diagonally upward from the front end between the L-shaped cutouts. A bent piece 65 is formed, and two reel stand insertion holes 66 are formed in a portion between the notch 63 provided at the rear end and the front end, and are spaced apart from each other in the left-right direction.
66' is formed.

Reference numeral 67.67' denotes a side piece that stands upward from a position near the rear end of the left and right edges of the cassette mounting plate 12, and a side piece 67.67' stands up upward from a position near the rear end of the left and right side edges of the cassette mounting plate 12. A support bin 68, 68' is provided as a cover and a support bin 68, 68' which protrudes substantially horizontally. Reference numeral 69 (see FIG. 3) is a stopper that protrudes toward the right side from a position on the rear side of the side piece 67' of the right side of the cassette mounting plate 12, and this stopper 69 has a lid portion to be described later. This is to hold it in place.

Reference numerals 70 and 70' (see FIG. 8) are switch suppressing pieces provided so as to protrude downward from both left and right sides of the bottom surface of the cassette mounting plate 12;
Reference numeral 70' is used to press a detection switch, which will be described later, for detecting whether or not there is an inclination in the posture of the cassette carrier 7 when it reaches the loading completion position.

(d-3-b, side plates) [FIGS. 1 to 4, 7 to 9] The left and right side plates 8.8' of the cassette carrier 7 correspond to the length of the cassette mounting plate 12 in the front and back direction. It has approximately 1.5 times the length, and its width is equal to that of the left and right side plates 5 of the sliding body 5.
The width is approximately equal to the width between the opposing surfaces of 0.50', and a recessed portion 71.71' is formed in approximately one third of the upper surface near the front end.

Reference numeral 72.72' denotes a decorative portion that has a substantially horizontally tilted shape when viewed from the side, and the decorative portion 72.72' is a portion of the inner surface of the side plate 8.8' that corresponds to the recessed portion 71.71'. It is formed to protrude inward from the

In the cassette mounting plate 12, mounting pieces (not shown) projecting upward from the front portions of both left and right edges are inserted from below into groove-like portions (not shown) formed in the above-mentioned decorative portions 72, 72'. The decorative portion 72.8 is fixed to the side plate 8.8' by screwing into the mounting piece a screw inserted through a screw insertion hole formed in the side plate 8.8'.
The inner surface of 72' is the side piece 67, 67 of the cassette mounting plate 12.
' is located on approximately the same plane.

73.73' is an engagement pin projecting outward from the upper end of the front end of the side plate 8.8' substantially horizontally, and 74.7
Reference numeral 4' denotes an engagement piece that extends along the vertical direction on the outside of a portion near the rear end of the side plate 8.8' and is formed in a substantially oval shape when viewed from above.

Reference numeral 75.75' denotes a guided bin that projects outward from the upper end of the rear end of the side plate 8.8' substantially horizontally.

Further, 76.77, 76', and 77' are guide racks formed to extend vertically on the outer surface of the side plate 8.8'.
7' located on the front side 76.76' is formed on the front side of the recessed part 71.71', and 7' located on the rear side
7.77' is formed on the front side of the engagement piece 74.74'.

(d-3-c, rack) [Fig. 1, Fig. 4, Fig. 7 to Fig. 9] Also, as mentioned above, the left and right side plates 8, 8' of the cassette carrier 7 have their bottom and front edges. A rack 9.9' extending continuously on the surface is formed, and a portion (hereinafter referred to as "horizontal portion") 9a of these racks 9.9' is formed on the bottom surface of the side plate 8.8'. 9'a and the part formed on the front end surface of the side plate 8.8' (hereinafter referred to as the "vertical part") 9b
, 9'b are continuous (hereinafter referred to as "continuous section").

) 9c and 9'c are formed to extend in a substantially arc shape.

A notched portion 78 is formed by removing two ridges from a portion of the horizontal portion 9'a of the rack 9' formed on the left side plate 8' near the aGN portion 9'c.

(D-3-d, i) [Figures 1 to 3, Figure 5,
7, FIG. 8] Reference numeral 79 indicates a left-hand part for rotating the front cover 62 of the tape cassette 13. Side pieces 79b, 79b protrude forward at a substantially right angle from both left and right ends of the main portion 79a, forming a substantially U-shape, and the front ends of the left and right sides 79b, 79b are used to place a cassette. The misplaced support pin 68 protrudes from the side pieces 67, 67' of the plate 12.
．． 68' is rotatably supported.

One half of a torsion spring 80 (shown only in FIG. 3) fitted onto the right side support pin 68' is attached to the right side piece 79b of the left side 79. As a result, a counterclockwise rotation force is applied to the misplaced item 79 in the counterclockwise direction in FIG. 5, and when no force is applied to rotate it clockwise, the right side piece 79b The main portion 79 is brought into contact with the stopper 69 formed on the cassette mounting plate 12 from above.
a is held in a substantially vertical position (hereinafter referred to as the "non-raised position"), and in this state, the main portion 79a approaches the positioning pieces 64 and 64' of the cassette storage plate 12 from behind. be located.

A push-up piece 81 (see FIG. 3) that slightly protrudes to the right is formed at the lower end of the left side piece 79b, and when the tape cassette 13 is placed on the cassette placement plate 12, The lower edge of the left side of the front surface M62 is located on this push-up piece 81.

Further, the lower end surface of the main portion 79a is formed in a so-called chamfered slanted shape, as can be seen clearly in FIG.

(d-3-e, Support of cassette carrier) [Figs. 2 to 4, 8, and 9] The cassette carrier 7 configured in this way has the sliding body 5 and the feed gear 11.11. ′ is supported as follows.

That is, the cassette carrier 17 has its engagement pins 73,73
' are slidably engaged with the front guide grooves 58, 58' formed in the side plates 50, 50' of the sliding body 5, and the engaging pieces 74, 74' are engaged with the front guide grooves 58, 58' formed in the side plates 50, 50' of the sliding body 5, Side plate 5
It is slidably engaged with a rear guide groove 57.57' formed at a diameter of 0.50', and is supported by the sliding body 5 so as to be movable in the vertical direction.

When the cassette carrier 7 is supported by the sliding body 5 in this manner, the guide racks 76, 77, 76', and 77' formed on the side plates 8, 8' of the cassette carrier 7 are rotatably supported by the sliding body 5. The pinion gears 6o, 60
and 60', 60'. Therefore,
The cassette carrier 7 has two pinion gears 60.6 at both front and rear ends of its side plate 8.8' which are rotated in synchronization with each other.
0, 60', and 60', the height of the cassette carrier 7 is always maintained at the same level, so that the attitude of the cassette carrier 7 is always maintained horizontally.

Further, the position of the cassette carrier 7 at the upper end of its movement stroke in the vertical direction (hereinafter referred to as the "floating position").

), the top surface of the side plate 8.8' is aligned with the top surface of the side plate 50.50' of the sliding body 5, and the bottom plate of the side plate 8.8' is also aligned with the bottom surface of the side plate 50.50'. The decorative portion 72.72' formed on the side plate 8.8' is located at approximately the same height as the inverted trapezoidal recess 53.53' formed on the side plate 50.50' of the sliding body 5. It will be located in line with.

Furthermore, the cassette carrier 7 is shown in FIGS. 4, 8, and 9.
As can be clearly seen from the drawings, the rack 9.9' meshes with the feed gear 11.11' supported on the support 6 side.

(d-4, cassette carrier and sliding body #J) Thus, the cassette carrier 7 and the sliding body 5 are moved as follows.

(d-4-a, movement in the loading direction) From the state where the sliding body 5 is at the pull-out position, that is, the state where the cassette carrier 7 is at the eject position, the feed gear 11.11
When ' is rotated counterclockwise, the horizontal parts 9a, 9'a of the rack 9.9' are sent rearward, so that the cassette carrier 7 is held in its floating position and the rack 9.9' is rotated counterclockwise. The sliding body 5 is also moved rearward integrally with the sliding body 5.

When the slider 5 reaches a position slightly before reaching its retracted position, the continuous portions 9c, 9'c of the rack 9.9' of the cassette carrier 7 are engaged with the feed gear 11.11', and at this point From this point on, the amount of rearward movement of the cassette carrier 7 is gradually decreased, and the amount of downward movement thereof is gradually increased.

From this point on, the guided bins 75 and 75' provided at the rear end of the cassette carrier 7 are aligned with the front edges 27a and 27 of the guide pieces 27 and 27' formed on the upper chassis 17, which form a substantially inverted shape. 'a and the front edges 27a, 27'a
B is now moved from sliding contact to , and as a result,
The moving direction of the cassette carrier 7 is guided so that the eighth shift follows a substantially inverted-shaped moving locus.

At the same time, when the sliding body 5 is pulled in to a position slightly before reaching its retracted position, the rear end surface of the insertion part 54 of the left side plate 70 is connected to the coil spring 25 fitted onto the left guide glaze 24. , and begins to compress it, the repulsive force of the coil spring 25, that is, the forward pressing force is applied to the sliding body 5, and this pressing force is also applied to the cassette carrier 7, so that The rack 9.9' is made to be pressed against the feed gear 11.11', so that the continuous part 9c of the rack 9.9',
9”c and vertical parts 9b, 9'b and feed gear 11.11'
This will ensure that the mesh is maintained securely.

Then, at approximately the same time as the sliding body 5 reaches its retracted position, the vertical portions 9b, 9'b of the rack 9.9' of the cassette carrier begin to mesh with the feed gear 11.11'.
From this state, the cassette mounting plate 7 is moved exclusively downward.

Note that when the cassette carrier 7 is moved downward, the guide racks 76, 77, 76 formed on the side plate 8.8' of the cassette carrier 7 move downward.
', 77' are pinion gears 60.
60, 60', and 60' are all rotated synchronously as they move downward.

As shown by the thin two-dot chain line in FIG.
When the cassette carrier 7 descends until it is located at approximately the same height as the upper end surfaces of 2.32' and 33.33', a stopper (not shown) prevents the cassette carrier 7 from moving downward. It will reach the completion position.

In this state, the rack 9 of the cassette carrier 7
．． As shown in FIGS. 4 and 8, the upper ends of the vertical portions 9b, 9'b of the 9' are engaged with the feed gears 11.11', and the guide racks 76.77.76', 77 ' has its upper end meshed with pinion gears 60, 60, 60', 60'.

When the cassette carrier 7 reaches the loading completion position, the cassette carrier 7 is prevented from moving upward by a locking means (not shown) provided on the mechanical chassis 29.

(d-4-b, O shift in the unloading direction) Also, from the state where the cassette carrier 7 has reached the loading completion position, the lock on the cassette carrier 7 by the locking means described above is released, and the feed gear 11.11
When ' is rotated clockwise, the vertical parts 9b and 9'b of the racks 9 and 9' of the cassette carrier 7 are sent upward, so that the cassette carrier 7 is moved toward the floating position, and the cassette carrier 7 is moved a little towards the floating position. When it rises to the front position, the continuous parts 9c and 9'c of the rack 9.9' are connected to the feed gear 11.1.
1', the upward movement of the 3rd shift is gradually reduced,
Moreover, the amount of forward movement is gradually increased. Therefore, from this point on, the cassette carrier 7 begins to press the sliding body 5 forward, and the sliding body 5 begins to be moved forward from its retracted position.

Then, the cassette carrier 7 reaches the floating position when the horizontal portions 9a, 9'a of the rack 9.9' begin to mesh with the feed gear 11.11', and is now moved exclusively toward the front. When the sliding body 5 reaches the pull-out position, forward movement thereof is prevented, and the cassette carrier 7 reaches the eject position.

In addition, this situation! In the pawl, the rack 9.9' of the cassette carrier 7 is engaged with the rear end of its horizontal part 9a, 9'a with the feed gear 11.11', and the guide rack 76.77
．． 76' and 77' have pinion gears 60.6 at their lower ends.
0, 60', 60' are meshed.

(d-5, detection switch) [Fig. 8] 82.82' is a detection switch provided on the mechanical chassis 29, and the detection switch 82.82' , that is, the position in which the left and right sides are not shifted in the vertical direction (
Hereinafter, this will be referred to as the "regular posture." ) is a switch for detecting whether or not the loading completion position has been reached.

These detection switches 82 and 82' each have two contact pieces 82a located vertically apart from each other.
and 82a, 82'a and 82'a, and the contact pieces 82a, 82a and 82'a, 82'a are lowered to the loading completion position by the switch suppressing pieces 70, 70' of the cassette carrier 7. It is placed in a position where it can be pressed.

Therefore, when the cassette carrier 7 comes down to the loading completion position in the normal posture, these detection switches 82, 82' are activated by any of the contact pieces 82a, 82ai and 82', as shown by the solid line in FIG. a, 82'a are also brought into contact with each other by being pressed by the switch pressing pieces 7o, 70', and thereby a predetermined signal is output from the two detection switches 82, 82'.

However, the cassette carrier 7, for example,
As shown by the dotted chain line, when the right side comes down to the loading completion position with the right side higher than the left side, 2
The contact pieces 82a, 82a of the left detection switch 82 of the two detection switches 82, 82' are in contact with each other,
In this state, the cassette carrier 7 moves downward by -3'! ,
11 is stopped, the contact pieces 82'a and 82'a of the right detection switch 82' remain separated.

Therefore, in such a case, a signal will be output only from the left detection switch 82, thereby detecting that the cassette carrier 7 has descended to the loading completion position in an inclined position.

In a control circuit (not shown), when the cassette carrier 7 descends to the loading completion position and a predetermined signal is output from both of the two detection switches 82, 82', a predetermined operation such as tape loading operation is started. If a signal is output from only one of the two detection switches 82, 82', the motor 38 is rotated in the reverse direction, that is, counterclockwise, to move the cassette carrier 7 to the eject position. configured to return.

(d-6, Operation for correcting the phase shift of the rack of the cassette carrier) [Figs. 8 and 9] By the way, when the cassette carrier 7 comes to the eject position, the cassette carrier 7 and the sliding body 5 are moved to the outer casing 2. Since it is positioned so as to protrude from the formed opening 4, if the sliding body 5 is pressed and forced into the outer casing 2 from that state, the two racks 9 of the cassette carrier 7 It is possible that the phase of the part meshing with the feed gear 11 and 11' between . will be automatically fixed by redoing the .

The operation for correcting such a phase shift will be explained with reference to FIGS. 8 and 9.

As an example, the phase shift between the racks 9 and 9' is a shift in which the meshing position of the right rack 9' with the feed gear 11' is one mesh behind the meshing position of the left rack 9 with the feed gear 11. It is assumed that

In addition, if such a phase shift occurs between the racks 9.9', the rigidity of the side plates 8.8', the cassette mounting plate 12, etc. on which the left and right racks 9.9' are formed will be affected. This results in forces moving in opposite directions. Therefore, in the case of the phase shift described above, the horizontal portions 9a, 9''a of the rack 9.9' are connected to the feed gear 11.11'.
When engaged with the rack 9 on the left side, there is a B facing forward.
A force is generated, and a rearward moving force is generated in the right rack 9', and the vertical part 9b of the rack 9.9'
, 9'b are engaged with the feed gears 11, 11', an upward moving force is generated on the left rack 9, and a downward moving force is generated on the right rack 9'.

Therefore, when the cassette carrier 7 comes down to the loading completion position in this state, the upper end of the vertical portion 9b of the left rack 9 is connected to the left feed gear, as can be clearly seen from FIG. 9(A). 11, but the right rack 9
' is engaged with the right feed gear 11' at a position one pitch below the upper end of the vertical portion 9'b, and in this state the downward movement of the cassette carrier 7 is stopped.

Therefore, the cassette carrier 7 comes down in an inclined position with its right side located one pitch above the rack 9.9' from its left side, as shown by the two-dot chain line in FIG. As shown, only the left detection switch 82 outputs a predetermined signal.

As a result, it is detected that the cassette carrier 7 has not come down to the recording/reproducing section 28 in a normal position, so the motor 38 is reversed and the feed gears 11, 11' are rotated clockwise. Therefore, cassette carrier 7
is returned to the eject position.

When the cassette carrier 7, which is being returned to the eject position in this way, comes to rest on the horizontal part of its 8th shift trajectory, it will soon move to the right rack 9' as shown in FIG. 9(B). The formed toothless portion 78 faces the right feed gear 11'.

As a result, the rack 9' on the right side is temporarily connected to the feed gear 1.
1', and in this state, the power 8 generated in the right rack 9', that is, the rearward movement force, causes it to be pushed backward one pitch at a time. become.

As shown in FIG. 9(C), the left and right racks 9
．． The phases between the positions 9' and 9' are aligned, and the cassette carrier 7 is moved to the eject position in this state.

Incidentally, when the cassette carrier 7 that has been returned to the eject position in this manner is moved again to the loading completion position, it will come down this time in a normal posture without tilting with respect to the recording/reproducing section 28. , two detection switches 82, 82' contact pieces 82a and 82a, 82'a and 82
'a' will come into contact with each other as shown by the solid line in FIG. Therefore, this time the two detection switches 82.82
A predetermined signal is outputted from both 1 and 2, and the next predetermined operation, for example, a tape loading operation, is started.

(d-7. Tape cassette loading and unloading operations) The tape cassette loading and unloading operations performed by the tape cassette loading mechanism 37 configured as described above are performed as follows.

(d-7-a, loading operation) First, the loading operation will be explained.

When the loading operation is started with the tape cassette 13 placed on the cassette@placement plate 12, the sliding body 5 is moved rearward, and the tape cassette 13 is rotatably placed on both left and right sides of the cassette carrier 7. The left and right sides of the cassette case 34 are held from above by the supported cassette holders 83, 83'. When the sliding body 5 reaches a position slightly before reaching the retracted position, the misplacement tray 79 provided on the cassette carrier 7 is removed from the mechanical chassis 29, as shown by the thick two-dot chain line in FIG. By riding on the left-behind rotation pin 35, it is rotated slightly clockwise, whereby the push-up pieces 81 formed in the seven left-behind pins move toward the front surface M6 of the tape cassette 13.
2 is pushed upward, the front surface M62 begins to be rotated from the closed position where the tape pull-out surface 34a of the cassette case 34 is closed to the open position where the tape pull-out surface 34a is opened.

From this state, the sliding body 5 moves fBj to its retracted position.
As the cassette carrier 7 moves downward, the 8 ml
At the same time as the cassette carrier 7 reaches the loading completion position, the cassette case 34 of the tape cassette 13 is placed on the upper end surface of the cassette positioning pins 32, 32' and 33, 33' that are set upright from the mechanical chassis 29. The insertion portion 32a132'a formed on the rear cassette positioning pin 32.32' is inserted into a positioning hole (not shown) formed on the bottom of the tape cassette 13 placed on the tape cassette 13. The tape cassette 13 is positioned in the horizontal direction and the height direction with respect to the recording/reproducing section 28.6 Then, the tape cassette 13 is mounted on the recording/reproducing section 28, and in this state, the misplaced tape 79 is moved approximately 90' clockwise. Therefore, the front surface N62 of the tape cassette 13 reaches the open position, and as a result, the tape draw-out surface 34a of the cassette case 34 is opened facing the head drum 30. In addition, the reel stand 31 is inserted into the engagement hole of a tape reel (not shown) housed in the cassette case 34.
．． The reel engaging shafts 31a and 31'a of 31' are inserted relative to each other.

Incidentally, when the cassette carrier 7 reaches the loading completion position in this manner, if the phases between the two racks 9 and 9' of the cassette carrier 7 are out of phase, the cassette carrier 7 is This is detected by the detection switches 82 and 82', and the cassette carrier 7 is returned to the eject position as described above, and while being returned in this manner, the phase The discrepancy will be corrected.

(d-7-b, Unloading Operation) Next, the unloading operation will be explained.

When the unloading operation starts from the state where the cassette carrier 7 has reached the loading completion position, the cassette carrier 7 is first moved to the floating position, and then moved forward while pressing the sliding body 5. The moving body 5 is moved to the pull-out position, and the cassette carrier 7 is moved to the eject position! a.

Then, while the cassette carrier 7 is moved eight times to the floating position, the front surface M62 of the tape cassette 13 is returned from the open position to the closed position, and while the cassette carrier 7 is being moved forward, the cassette presser 83 The holding of the tape cassette 13 by .83' is released.

(G. Effects of the Invention) As is clear from the above description, the recording medium loading mechanism of the present invention is movably supported by a support body, and eight ribs are provided between the eject position and the loading completion position. It has two racks that are spaced apart from each other in a direction perpendicular to the direction of movement, extend along the direction of movement, and mesh separately with two feed gears supported on the support side, and when the feed gears are rotated, 8 The present invention is characterized in that one of the two racks is provided with a tooth-missing portion in which one or more teeth are removed.

That is, according to the present invention, if a phase shift occurs between the two racks, the recording medium transport member will be distorted against the rigidity of the members constituting it. Therefore, from this state, move the recording medium conveying member in a predetermined direction so that the toothed portion faces one of the racks, and the toothed portion faces one of the feed gears. When the two racks reach the opposite position, one rack is released from meshing with one of the feed gears, and the moving force automatically moves the two racks to a position where they are in phase with the other rack.

According to the present invention, even if a phase shift occurs between the two racks, the phase shift can be automatically corrected by redoing the eight rotations of the recording medium conveying member.

In the embodiment described above, a detecting means is provided for detecting whether or not the posture of the recording medium conveying member when it reaches the loading completion position is out of phase between the two racks, and the When it is detected that the recording medium transport member has been loaded, a part of the recording medium transport member is returned to the eject position and the recording medium transport member is automatically moved to the loading completion position again. By doing so, it is possible to automatically correct the phase shift between the two racks of the recording medium transport member.

Further, in the above-mentioned embodiments, the present invention is applied to a recording medium loading mechanism of a tape recorder whose recording medium loading method is a so-called linear skating method, but the present invention is not limited to such an example of application. It is not a thing that is supported BwJ by a support body, is moved between an eject position and a loading completion position, and is spaced apart from each other in a direction orthogonal to the movement direction, and extends along the movement direction and is on the side of the support body. It can be applied to various recording medium loading mechanisms that have two racks that mesh separately with two feed gears supported by the feed gear, and have only a few recording medium transport members that are moved when the feed gears are rotated. .

[Brief explanation of the drawing]

1 to 9 show an example of an implementation in which the recording medium loading mechanism of the present invention is applied to a tape cassette loading mechanism of a VTR. FIG. 1 is a bottom view of a cassette carrier, and FIG. FIG. 3 is a plan view of the tape cassette loading mechanism, FIG. 4 is a partially omitted side view of the tape cassette loading mechanism, and FIG.
The figure is a side view of the main parts showing the tape cassette loading operation, Fig. 6 is an enlarged perspective view of the sliding body, Fig. 7 is an enlarged perspective view of the cassette carrier, and Fig. 8 shows the main parts of the tape cassette loading mechanism on the cassette carrier. Fig. 9 is an enlarged front view showing the state where the cassette carrier is at the loading completion position, and Fig. 9 shows the operation to correct the phase shift between the two racks of the feed gear and the cassette carrier in order from (A) to (C). An enlarged side view of the main parts, and FIGS. 10 and 11 show an example of a tape recorder that employs a linear skate tape cassette loading method. FIG. 10 is a schematic side view, and FIG. 11 is a schematic front view. It is. Explanation of symbols 6... Support body, 7... Recording medium transport member, 9.9'... Rack, 11.11'... Feed gear, 37... Recording medium loading mechanism, 78...・Tooth missing part Fig. 9<A) Fig. 9 CB) 9 stem L nib;

Claims (1)

[Scope of Claims] Movably supported by a support body, moved between an ejection position and a loading completion position, and located apart from each other in a direction perpendicular to the movement direction, extending along the movement direction and on the side of the support body. A recording medium conveyance member having two racks that mesh separately with two feed gears supported by the feed gear and is moved by rotation of the feed gear, and one or more teeth on one of the two racks. A recording medium loading mechanism characterized by having a toothless portion from which the tooth is removed.