JPS6314363A - Meshing conduction mechanism - Google Patents

Abstract

PURPOSE:To mesh two meshing members reasonably even when the mutual position accuracy is not so much excellent by forming a marginal part to at least one of the two meshing members while being placed between the meshing part and a support part placing part of teeth of the meshed part of the other meshing member. CONSTITUTION:A distance L3 between the rear end of a front guide rack 10 and a front end of a rear guide rack 11 is slightly made shorter than a distance L4 between the rear end of a front pinion gear 12 and a front end of a rear pinion gear 12. Thus, even if the two distances L3, L4 are more or less changed, the pinion gears 12, 13 do not collide with the outer side face of the side plate 9. Then the guide racks 10, 11 and the pinion gears 12, 13 are meshed easily with each other without giving any loss of function of each part. Moreover, the above is applied to the relation between the right side guide rack and the pinion gear.

Description

[Detailed description of the invention] The intermeshing type transmission mechanism of the present invention will be explained according to the following items.

A. Industrial field of application B1 Overview of the invention C6 Background art [Figures 11 and 12] D1 Problems to be solved by the invention [Figure 12] E9 Means for solving the problems F. Examples a. Overview of video tape recorder [Figs. 2 to 4] b. Support body [Figs. 3 and 4] C0 recording and reproducing unit [Figs. 3 and 4] d. Tape cassette loading device [Fig. Figure 1 to 1st
Figure 0, d-1, Drive unit [Figure 3] d-2, Sliding body [Figures 2 to 5, d-3, Cassette carrier [Figures 1 to 4, Figures 6 to 10] Figure d-3-a, cassette mounting plate [Figures 1 to 3, Figure 6 d-3-b, side plate [Figures 1 to 4, Figures 6 to 10] d-4, Cassette carrier guide mechanism [Figs. 3 to 6, 9, 10] d-4-a, Guide rack [Figs. 3, 4, 6, 9, [Fig. 10] d-4-b, Pinion gear [Fig. 3 to 5, Fig. 9, Fig. 10] d-4-c, Maintaining the posture of the cassette number gear by the guide rack and pinion gear d-4- d Ease of meshing between the guide rack and pinion gear [Figs. 9 and 10] d-5. Cassette carrier 8-shaft mechanism [Figs. 1, 3, 4, and 6 to 8] d-5-a, rack [Fig. 1, Fig. 4, Fig. 6, Fig. 7, Fig. 8 d-5-1), feed gear [Fig. 1, Fig. 3, Fig. 4, Figures 7 and 8 d-5-c, Support of the cassette carrier by the feed gear d-5-d, Ease of engagement between the rack and the feed gear [Figure 1] d-6, Cassette carrier and sliding Movement of the moving body d-6-a, Movement in the loading direction d-6-b, Working in the unloading direction d-7, Tape cassette loading operation and unloading visit G Effects of the invention (A Industrial application Field) The present invention relates to a novel meshing type transmission mechanism. Specifically, a meshing part consisting of a plurality of teeth and a support part located on the side of the meshing part and whose support surface is at approximately the same position as the reference pitch circle or reference pitch line of the meshing part are integrally formed. In addition to reducing two meshing members, such as a gear and a rack,
This relates to a meshing type transmission mechanism in which the meshing portions of the two meshing members mesh with each other and the support surfaces of the respective support portions contact each other, and although the structure is relatively simple, the dimensions of the two meshing members are An object of the present invention is to provide a novel meshing type transmission mechanism that allows two meshing members to be meshed with each other without difficulty even if the above-mentioned processing accuracy and mutual positional accuracy when they are meshed with each other are not very high. It is something.

(B. Summary of the Invention) The meshing type transmission mechanism of the present invention comprises a meshing part made up of a plurality of teeth, and a support surface of the meshing part located on the side of the meshing part, which is approximately equal to the reference pitch circle or reference pitch line of the meshing part. In a meshing type transmission mechanism comprising two meshing members integrally formed with support portions located at the same position, the meshing portions of the two meshing members meshing with each other, and the support surfaces of the support portions contacting each other. , forming an allowance in at least one of the two meshing members, which is located between the meshing part and the support part and in which a part of the teeth of the meshing part of the other meshing member can be located, and thereby, The two meshing members can be meshed with each other without difficulty even if the dimensional processing accuracy of the two meshing members and the mutual positional accuracy when they are meshed with each other are not so high.

(C, Background Art) [Figures 11 and 12] Today, meshing type transmission mechanisms, such as pinion gears or racks,
A mechanism in which two meshing members are provided in a state of meshing with each other so that the torque of one meshing member is transmitted to the other meshing member, or the position or direction of movement of one meshing member is regulated or guided by the other meshing member is There are various types, and they are used in various devices.

By the way, in general, the two meshing members in such a meshing type transmission mechanism are often provided in a state where each is supported separately on a rotating shaft or guide means, but in any case, these meshing members Since the two meshing members are engaged with each other, it is also possible to have one meshing member support the load or restrict the position of the other meshing member.

For example, in a meshing transmission mechanism in which a rack is moved by a pinion gear, the pinion gear is fixed to a rotating shaft supported by a predetermined bearing means, and the rack is in a state where its load is supported by the pinion gear.
It is conceivable to provide it in a state where it is placed on the pinion gear.

However, in this case, if the rack is supported with the tip of one of the teeth of the rack and the tooth of the pinion gear in contact with the root of the other, not only will the meshing between the rack and pinion gear become heavy, but There is significant tooth friction and a harsh sound is usually produced when the rack is rotated.

Therefore, in such a meshing type transmission mechanism, that is, in a meshing type transmission mechanism in which one of two meshing members meshing with each other supports the other meshing member, a support portion having a supporting function is provided for each of the two meshing members. Some are formed so that their supporting parts are in contact with each other.

FIGS. 11 and 12 show an example of a tape cassette loading device a in which a meshing type transmission mechanism having a pinion gear and a rack in which such a supporting portion is formed is used.

In the figure, b is a sliding body supported by a support (not shown) so that it can move freely in the horizontal direction, and the cassette carrier C is supported on the sliding body so that it can move freely in the vertical direction. .

The cassette carrier C consists of two side plates d, d'' located apart from each other in the left-right direction, and a cassette mounting plate e connecting the side plates d, d', and the bottom surfaces of the side plates d, d'. Racks f and f' that extend continuously to these two surfaces are formed at the inwardly located portions of the bottom surface and the front end surface, and the support surface g is formed at the mutually outwardly located portions of the bottom surface and the front end surface.
, g'. In addition, the support surfaces g and g' are the rack f,
It is located at approximately the same height as the reference pitch line of f'.

h is a rotating shaft rotatably supported by a support (not shown), and pinion gears i, i' are fixed to the rotating shaft. The inward portions of the pinion gears i, i' in the thickness direction are the meshing portions j%j', and the outer peripheral surfaces of the portions located on the outside of the meshing portions j, j' are the supporting surfaces. It is ' in %. Incidentally, on the support surface, ni' is located at approximately the same height as the reference pitch circle of the teeth of the meshing portions j, j''.

The supporting surfaces g, g' of the side plates d, d' of the cassette carrier C are in contact with the supporting surfaces of the pinion gears i, i', and the racks f, f' are in contact with the supporting surfaces of the pinion gears i, i'.
The pinion gears i and i are in mesh with the meshing parts j and j' of
’ is supported.

Therefore, the load on the cassette carrier C is the pinion gear i,
Since it is supported by i' on the support surface of i', the teeth of the racks f and f' and the teeth of the meshing parts j and j' are meshed in a correct state.

Therefore, when the pinion gears i and i' rotate, the racks f and f'' are fed, so that the cassette carrier C is not moved.

(D. Problem to be Solved by the Invention) [Fig. 12] In this way, the supporting surfaces g that contact each other on the racks f, f' and the pinion gears i, i' that engage with each other,
If k" is formed at g', side plates d and d' are supported by pinion gears i and 1', and the teeth of racks f and f" and meshing parts j and j" of pinion gears i and i' are in the correct state. It can be meshed with.

However, with such a structure, unless the machining accuracy and mutual positional accuracy of the racks f, f' and pinion gears i, 1' are very high, they may not be able to mesh with each other, or they may not be able to mesh with each other. Even if it is possible to do so, there is a problem that the meshing operation becomes heavy.

That is, the support surfaces g, g' and ni' formed on the racks f and f' and the pinion gear 111' are directly connected to the teeth of the racks f and f' and the meshing parts i and i' of the meshing parts j and j'. For example, two racks f,
If the distance ff1I L + between f' is even slightly longer than the distance N L 2 between the two pinion gears i, i'', the tips of the teeth of the racks f, f' will be closer to the pinion gears i, i'.
It hits the support surfaces k and k' of. Also, on the contrary, it is L
Even if it is slightly shorter than 2, the tooth tips of the meshing parts i, i' of % k' on the pinion gear will come into contact with the support surfaces g, g' of the side plates d, d'.

Therefore, in a meshing type transmission mechanism with such a structure,
When the racks f, f' and pinion gears i, i' are engaged, it is necessary to adjust the separation distance, and for this purpose, some adjustment means must be provided.

However, if this is done, the structure becomes complicated and the cost increases, and another problem arises in that it takes time to assemble.

(E. Means for Solving the Problems) In order to solve the above-mentioned problems, the meshing type transmission mechanism of the present invention has a structure in which at least one of the two meshing members is located between the meshing part and the support part. Further, at least a portion corresponding to the portion between two adjacent teeth is formed with an allowance portion reaching a depth corresponding to the root of the tooth.

Therefore, according to the present invention, there is a margin between the meshing part of at least one of the two meshing members and the support part, which is a space in which a part of the teeth of the meshing part of the other meshing member can be located. Therefore, even if the end of the engagement part of the other engagement member on the support part side is not aligned with the end of the engagement part of one engagement member on the support part side, the two engagement parts will be connected to each other. It is possible to mesh with sufficient margin.

(F. Example) The details of the intermeshing type transmission mechanism of the present invention will be described below according to the example shown in the accompanying drawings.

In the embodiment shown in the drawings, the interlocking transmission mechanism of the present invention is applied to a cassette carrier sliding mechanism and a cassette carrier support mechanism in a tape cassette loading device of a video tape recorder.

(a. Overview of video tape recorder) [Figures 2 to 4
Figure] 1 is a video tape recorder (hereinafter referred to as rVTRJ).

).

2 is the outer casing of the VTRI, and its front panel 3 is an operation panel on which a predetermined display window and operation buttons are arranged.
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 by a support 6 fixed within the outer casing 2 so as to be slidable in the front-back direction.

Reference numeral 7 denotes a cassette carrier on which a tape cassette 8 is removably placed. Guide racks 10, 11 and 10', 11 formed near both front and rear ends of the outer surface of .9'.
' is a pinion gear 12 rotatably supported by the sliding body 5
．． By being engaged with 13, 12', and 13', its posture is always maintained horizontally.

Note that the guide racks 10.11, 10', and 11' formed on the side plate 9.9' of the cassette carrier 7 and the sliding body 5
The pinion gears 12.13 and 12', 13' constitute a cassette carrier guide mechanism 14.14'.

Also, on the bottom and front surfaces of the side plates 9.9' of the cassette carrier 7, racks 15.15 are provided that extend continuously from these two surfaces.
', and these racks 15, 15' are meshed with two feed gears 16, 16' provided on the support 6 so as to be spaced apart from each other in the left and right directions, and the cassette carrier 7 is Rack 15.15' is feed gear 1
6.16', it is sent in the horizontal direction to move fJ'#l in the front-rear direction, and by sent in the vertical direction, it is ejected in the up-down direction.

Note that the cassette carrier moving mechanism 17 is operated by the rack 15.15' of the cassette carrier 7 and the feed gear 16.16'.
This also serves as a cassette carrier support mechanism.

Then, while the cassette carrier 7 is being pushed forward and backward, the sliding body 5 is pushed forward and backward integrally with the cassette carrier 7, thereby causing the sliding body 5 to move forward and backward as shown by the thin two-dot chain line in FIG. The position where the front end surface is positioned so as to close the opening 4 formed in the outer casing 2 (hereinafter referred to as the "retracted position") is shown in FIGS. 2 and 3, and is shown in FIG. As shown by the thick two-dot chain line, the position is located so that almost the entire part protrudes outside the outer casing 2 (hereinafter referred to as the "drawer position").
Say. ).

Furthermore, when the slider 5 reaches the ejected position, most of the cassette carrier is located outside the outer casing 2 (hereinafter referred to as the "eject position"), as can be clearly seen in FIG. ), and when the sliding body 5 is moved in the vertical direction in the retracted position and reaches the lower end of the 8th shift stroke in the vertical direction, the fourth position is reached.
The position shown by the two-dot chain line in the figure is reached, that is, the position at which the tape cassette 8 placed thereon is loaded into the recording/reproducing unit (hereinafter referred to as the "loading completion position").

Therefore, the cassette carrier 7 is moved along an approximately horizontally tilted eight-leg trajectory.

(b, support) [Figures 3 and 4] The support body 6 consists of a lower chassis and an upper chassis.

18 is a lower chassis. The lower chassis 18 consists of a main part 19 formed in a substantially plate shape, a rear wall 20 formed upright from the rear end of the main part 19, 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.

21 is an upper chassis. The upper chassis 21 has a substantially square shape that is about one size larger than the outer shape of the lower chassis 18, and has a front piece 22, a rear piece 23, a main piece 24, and a stone piece 25, which are the four sides of the square. It is formed into a frame shape. The rear end portions of the main piece 24 and the stone piece 25 are positioned so as to protrude rearward from the rear piece 23,
A guide shaft support piece 26, 26' is formed at the rear end of each guide shaft support piece 26, 26' bent downward at a substantially right angle.

Further, the main piece 24 and the stone piece 25 are formed with side pieces 27 and 27' (only the front end thereof is shown in FIG. 3) bent downward from their outer edges, and The front end portions of the side pieces 27, 27' are formed into guide shaft support pieces 27a, 27'a bent inward in an oval shape.

28.28' is a guide shaft for slidably supporting the sliding body 5, and the rear end of the guide shaft 28.28' is supported by the rear guide shaft support piece 26.26'. The front end is supported by the front guide shaft support pieces 27a, 27''a, and therefore these two guide shafts 28, 28'
are arranged on both left and right sides of the upper chassis 21 so as to extend in the front and back direction.

29 (see FIG. 3) is a coil spring fitted onto the rear end of the left guide shaft 28. The action of this coil spring 29 will be described later.

As can be clearly seen from FIG. 3, the main pieces 24 and 8
A portion of the mutually opposing side edges of the piece 25 near the rear end is positioned so as to protrude inwardly from the other portions, and a guide piece 30.30 is bent downward at a substantially right angle to that portion.
' is formed, and the front edge 30a of the guide pieces 3o, 30'
, 3o'a are formed in a substantially inverted shape when viewed from the side.

The guide pieces 30, 30' are members for guiding the direction of movement of the cassette carrier 7 when the movement of the cassette carrier 7 in the front-rear direction and the movement in the up-down direction are continuous.

In the upper chassis 21 configured in this way, the rear piece 23 is placed on the upper end of the rear wall 20 of the lower chassis 18 and is screwed to the rear wall 2o, and the side pieces 27, 27 thereof are screwed to the rear wall 20. The mounting pieces 31 and 31' formed near the front end of the lower chassis 18 are fixed to the lower chassis 18 by being screwed to the mounting pieces formed at the upper end of a side wall (not shown) of the lower chassis 18.

As a result, the lower chassis 18 and the upper chassis 21 are coupled to each other, thereby forming the support body 6 which is generally box-shaped as a whole, and has two wooden blocks on both left and right sides of the upper end of the support body 6. A guide shaft 28, 28' will be arranged.

Note that 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 18 and the front piece 22 of the upper chassis 21, and the support 6 is arranged such that its opening approaches and faces the opening 4 of the outer casing 2 from the rear side, and is fixed to the outer casing 2 with a cup.

(c. Recording and reproducing section) [Figs. 3 and 4] 32 is a recording and reproducing section.

Reference numeral 33 denotes a mechanical chassis that serves as the base of the recording/reproducing section 32. The mechanical chassis 33 is fixed to the upper surface of the main part 19 of the lower chassis 18 of the support body 6, and has a rotating magnetic head (not shown) approximately at the center of the rear part thereof. A head drum 34 equipped with
is provided, and two reel stands 35, 35 are located near the front end of the reel stand spaced apart from each other in the left and right direction.
' is provided. 35a, 35'a are reel stands 35
．． 35' reel engagement shaft.

Four cassette positioning pins 36, 36' and 37, 37' are erected at the front of the mechanical chassis 33.
These four wooden cassette positioning pins are 36.36
The two rear cassette positioning pins 36.36' of ' and 37.37' have approximately the same female-shaped insertion portion 36 at their upper ends.
a136'a is formed, and the two front cassette positioning pins 37 and 37' are located near the front edge of the mechanical chassis 33, and the tape cassette 8 has its cassette case 8a attached to these cassette positioning pins. 36
．． 36' and 37.37', the height relative to the recording/reproducing unit 32 is defined, and the rear cassette positioning pins are inserted into two positioning holes (not shown) formed on the bottom of the cassette case 8a. By inserting the insertion portions 36a and 36'a of 36.36', the recording/reproducing section 32 is positioned in the horizontal direction.

Reference numeral 38 denotes a misplaced rotation pin, and the misplaced rotation pin 38 extends approximately toward the right from the upper end of the support piece 39 that is erected from approximately the center of the left side of the mechanical chassis 33 in the front-rear direction. It is provided so as to protrude horizontally.

(d. Tape cassette loading device) [FIGS. 1 to 10] 40 is a tape cassette loading device, and the tape cassette loading device 4o includes the sliding body 5, the cassette carrier 7, and the cassette carrier guide mechanism 14.
．． 14', a cassette carrier moving mechanism 17, and a drive section for rotating the feed gear 16, 16'.

(d-x, drive unit) [Figure 3] 41 is a driving section.

42 is a motor, and the motor 42 is connected to the lower chassis 18.
The drive pulley 43 is attached to the inner surface of the rear end portion of the left side wall (not shown), and a drive pulley 43 is fixed to the rotating shaft 42a.

Reference numeral 44 denotes a deceleration pulley having a considerably larger diameter than the drive pulley 43. The deceleration pulley 44 is integrally formed with a gear portion 45 located on the right side thereof, and is located approximately in the center of the left side wall of the lower chassis 18 in the front-rear direction. It is rotatably supported by a pulley support shaft 46 that projects approximately horizontally from the pulley, and an endless transmission belt 47 is stretched between the reduction pulley 44 and the drive pulley 43.

48 and 49 are reduction gears, and these two reduction gears 48 and 49 are rotatably supported by gear supports ID+ 50.51 protruding from the left side wall of the lower chassis 18, and are also rotatably supported by the rear reduction gears. A large gear 48a having a relatively large diameter and a small gear 48b having a relatively small diameter located on the right side of the dog gear 48a are integrally formed. 45, and its small gear 48b is also meshed with a reduction gear 49 on the front side.

When the motor 42 rotates, its rotational force is transmitted to the front reduction gear 49 through the transmission line: reduction pulley 43 - transmission belt 47 - reduction pulley 44 and its gear section 45 - rear reduction gear 48. , during such transmission, the rotational speed will be reduced to a predetermined rotational speed.

The motor 42 rotates clockwise when viewing the VTRI from the left side when loading is performed to move the cassette carrier 7 from the eject position to the loading completion position, and also rotates the cassette carrier 7 from the loading completion position to the loading completion position. When unloading is carried out, it is rotated counterclockwise.

(d-2, Sliding body) [FIGS. 2 to 5] The sliding body 5 has two side plates 52 and 52' whose main parts are spaced apart from each other in the left-right direction and which face each other substantially in parallel. The front plate 53 connecting the front ends of the side plates 52 and 52' forms a substantially U-shape that is long in the front and back direction when viewed from the top and bottom, and its width, that is, the outer surface of the side plates 52 and 52' The length between them is approximately equal to the length of the opening 4 formed in the outer casing 2 in the left-right direction.

The side plates 52, 52' are formed so that their cross-sectional shape forms a substantially U-shape that opens inward, and is located between the substantially middle portions of the U-shaped upper pieces 52a, 52'a in the front-rear direction. The reinforcing material 54 is provided in the form of a bridge, and recesses 55 and 55', which are approximately in the shape of an inverted trapezoid when viewed from the left and right, are formed in portions near the front ends of the upper pieces 52a and 52'a. There is.

Further, an insertion portion 56 protruding outward is formed at the upper portion of the outer surface of the U-shaped intermediate piece 52b of the left side plate 52 at approximately one-third of the rear end. Part 5
Through holes 57 and 57 are formed at both the front and rear ends of 6.

Furthermore, in substantially the same way, an insertion portion protruding outward is also provided at the upper portion of approximately one-third of the rear end of the outer surface of the U-shaped intermediate piece 52'b of the right side plate 52'. 56' is formed, and an insertion hole 57' is formed in the insertion portion.

Therefore, the sliding body 5 has the above-mentioned insertion holes 57, 57 and 57'.
The two wooden guide shafts 2 are supported by the upper chassis 21.
8.28' is inserted so as to be slidable, so that it is supported by the support body 6 so as to be slidable in the front and back direction, and as can be clearly seen from FIG. The front end surface of the guide glaze support pieces 27a and 27'a of the side pieces 27 and 27' of the upper chassis 21 is brought into contact with the guide glaze support pieces 27a and 27'a, thereby preventing the slider from moving forward from the drawing position.

58. 58, 58', 58' (see Figs. 3 and 5) are arranged approximately in the center in the longitudinal direction of the inner surfaces of the intermediate pieces 52b, 52'b of the side plates 52, 52', and are arranged in a longitudinal direction. These two protrusions 58, 58, 58', 5
A guide groove 59.5 extending along the vertical direction by 8'
9' are formed, and the lower ends of these guide grooves 59, 59' are opened in the lower pieces 52c, 52'C of the side plates 52, 52'. And the above protrusions 58, 58 and 58'5
Small engaging pieces 60 protrude rearward from the lower ends of the side edges of 58 and 58' located on the front side of 8', respectively.
．． 60' is formed.

Also, 61.61' is the intermediate piece 52b of the side plate 52.52'.
, 52'b have the guide grooves 59 and 59' on the inner surface of the front end.
This guide groove is formed so as to extend in the vertical direction by a forming means substantially similar to that of the guide groove 61.
The lower end of 61' is also opened into lower pieces 52c, 52'c.

(d-3, cassette carrier) [Figures 1 to 4, Figures 6 to 10] The cassette carrier 7 has the tape cassette 8 M i! ? The tape cassette 8 consists of a cassette mounting plate, the two side plates 9 and 9' located on the left and right sides of the cassette mounting plate, and a tray for opening and closing the front cover of the tape cassette 8.

(d-3-a, cassette mounting plate) [Figures 1 to 3,
FIG. 6] 62 is a cassette mounting plate. The cassette mounting plate 62 is formed into a substantially rectangular plate shape that is long in the left-right direction when viewed as a whole, and its thickness is as large as that of the tape cassette 1, as can be seen clearly in FIG. cassette case 8a
It is approximately the same size.

A notch 63 is formed in a portion of the cassette mounting plate 62 other than both left and right ends near the rear edge, and a positioning piece 64 protrudes upward from both left and right ends of the rear end. .64' is formed, and the left and right corners of the front edge are cut out in the shape of an abbreviated character, and a section between the L-shaped cutouts extends diagonally upward and toward the front from the front edge. A bent piece 65 is formed, and two reel stand insertion holes are located in a portion between the notch 63 provided at the rear end and the front edge and spaced from each other in the left-right direction. 66.
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 62. Left-behind support bins 68, 68' projecting approximately horizontally are provided, and left and right sides of the left-behind device 69 are rotatably supported by the left-behind support bins 68, 68'. .

(d-3-b side plates) [Figs. 1 to 4, 6 to 10] The left and right side plates 9.9' of the cassette carrier 7 are approximately the length of the cassette mounting plate 62 in the front-rear direction. It has a length of about 1.5 times, and its width is 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 2.52', and recesses 7o and 70' are formed in approximately one-third of the upper surface near the front end.

Reference numeral 71.71' denotes a decorative part forming a substantially horizontally inclined character shape when viewed from the side, and the decorative part 71.71' corresponds to the bottom surface of the recessed part 70.70' on the inner surface of the side plate 9.9'. It is formed to protrude inward from the inner part.

The cassette mounting plate 62 has mounting pieces (not shown) projecting upward from the front portions of both left and right edges of the cassette mounting plate 62. side plate 9.9' on the mounting piece of the device
The inner surface of the decorative portion 71.71' is attached to the side plate 9.9' by screwing the screw 72 inserted through the screw insertion hole formed in the cassette mounting plate 62. 6
It is located on approximately the same plane as 7.67'.

73.73' is an engagement pin that projects outward from the upper end of the front end of the side plate 9.9' substantially horizontally, and 74.7
Reference numeral 4' denotes an engagement piece that extends along the vertical direction on the outside of the portion near the rear end of the side plate 9.9' and is formed in a substantially oval shape when viewed from above.

Reference numeral 75.75' denotes a guided pin that projects outward from the upper end of the rear end of the side plate 9.9' substantially horizontally.

In the cassette carrier 7 configured in this way, the engaging pins 73 and 73' are connected to the side plates 52 and 52' of the sliding body 5.
The engagement piece 74.74 is slidably engaged with the front guide groove 61.61' formed in the front guide groove 61.61'.
' is slidably engaged with the rear guide groove 59.59' formed in the side plate 52.52' of the sliding body 5, and is bent toward the front of the engagement piece 74.74'. The portions are slidably engaged with engaging pieces 60, 60' formed on the protrusions 58, 58' forming the guide grooves 59, 59'.

(d-4, Cassette carrier guide mechanism) [Figures 3 to 6, 9 and 10 The cassette carrier guide mechanism 14 and 14' is a mechanism for keeping the posture of the cassette carrier 7 horizontal at all times. The guide racks 10.11 and 10', 11' formed on the outer surface of the side plate 9.9' of the cassette carrier 7 and the sliding body 5
Pinion gears 12, 13 and 1 rotatably supported by
2' and 13'.

Since the left and right cassette carrier guide mechanisms 14 and 14' have symmetrical structures, only the left cassette carrier guide mechanism 14 is shown in detail in FIGS. 9 and 10. In addition, the explanation will be given only for the left cassette carrier guide mechanism 14, and for the right cassette carrier guide mechanism 14', each part shown in the drawings will be described by r. ’” is omitted by attaching a numeral.

(d-4-a, guide rack) [Fig. 3, Fig. 4, Fig. 6, Fig. 9, Fig. 10] The guide rack 10.11 is the left side plate 9 of the cassette carrier 7.
The front side 10 extends in the vertical direction with its upper part located along the front edge of the recess 70 on the outside side, and the rear side 11 extends vertically along the front edge of the recess 70. It is located on the cargo side of the mating piece 74 so as to extend in the vertical direction.

These guide racks 10 and 11 have meshing portions 76 and 77 that mesh with the pinion gears 12 and 13.
．． It consists of a support part 78, 79 located on the outside of 77, and margin parts 80, 81 located between the above-mentioned meshing part 76, 77 and support part flap 8, 79.

That is, 82.82, . . . and 83.83, . . . are rack teeth arranged along the vertical direction at equal intervals on the outer surface of the side plate 9. .82, . . . and 83.83, . . . constitute the meshing portions 76 and 77. The support portions 78 and 79 are configured as flat surfaces extending in the vertical direction,
The plane has the rack teeth 82.82, . . . and 83.8.
It is located in the same plane as the reference pitch line of the meshing portions 76, 77 consisting of 3, .

The allowance portion 80.81 located between the meshing portion 76.77 and the support portion 78.79 includes support surfaces 84.84, . 85.
85,... and these bearing surfaces 84.84,...,8
The rack teeth 82.8 are located between each of the rack teeth 82.8, .
2, .
, . . . , 83.83, . . . Continuous trough portions 86.86, . . . , 87.87, .

(d-4-b, pinion gear) [Figs. 3 to 5, 9 and 10] 88 is along the lower end of the inner surface of the intermediate piece 52b of the left side plate 52 of the sliding body 5, and This is a rotating shaft positioned such that its axial direction extends along the front-rear direction, and the pinion gears 12, 13 are fixed to both front and rear ends of the rotating shaft 88.

The pinion gear 12.13 includes a meshing portion 89.90 and a support portion 91.9 integrally formed with the meshing portion 89.90.
It consists of 2. That is, the front pinion gear 12.13 has a large number of gear teeth 93.93 on its outer periphery.
It consists of a meshing part 89 formed with... and a substantially disk-shaped support part 91 formed to protrude from the front side of the meshing part 89, and the rear pinion gear 13 has a large number of parts on its outer periphery. The meshing portion 9 is formed with gear teeth 94, 94, .
0 and a substantially disk-shaped support portion 92 formed to protrude from the rear side surface of the engaging portion 90, and the support portions 91.92
The width of the supporting portion 78.7 of the guide rack 10.11 is slightly narrower than the width of the supporting portion 78.7 of the guide rack 10.11, and its outer circumferential surface is located in approximately the same plane as the so-called reference pitch circle of the engaging portion 89.90. ing.

Further, the rotating shaft 88 is connected to the intermediate piece 52 of the left side plate 52 of the sliding body 5.
The front pinion gear 12 of the pinion gears 12 and 13 is supported by a bearing (not shown) formed on the inner surface of the It is arranged so as to be located slightly behind the guide groove 61 formed in the intermediate piece 52b.

As shown in FIG. 9, the pinion gear 12.13 has a meshing portion 89.90 whose distance between the two opposite sides of the support portion 78.7 of the guide rack 10.11.
The distance tmL+(
Hereinafter, this will be referred to as the "reference distance" between the guide racks 10 and 11. ) is referred to as the "based distance" between pinion gears 12 and 13. ) and are fixed to the rotating shaft 88 so as to be spaced apart from each other.

(d-4-c, Maintenance of cassette carrier posture by guide rack and pinion gear) As described above, the cassette carrier 7
The engaging pin 73.73' and the engaging piece 74.7 provided at
4' is slidably engaged with guide grooves 61.61' and 59.59' formed in the side plates 52.52' of the sliding body 5, so that the sliding body 5 can freely move in the vertical direction. It is supported as follows.

When the cassette carrier 7 is supported by the sliding body 5 in this way, the guide racks 1o and 11 formed on the left side plate 9 of the cassette carrier 7 are connected to the pinion gears 12 and 13 supported on the left side plate 52 of the sliding body 5. It will be meshed with. That is, the rack teeth 82.82, . . . , 83.83, .
93, . . . , 94.94, . . . will mesh with each other.

Additionally, the support section 78 of the guide rack 10.11
．． 79 and the support 91.92 of the pinion gear 12.13 come into contact.

In addition, in the same way, the right side plate 9 of the cassette carrier 7
The meshing parts (not shown) of the guide racks 10', 11' formed on the guide racks 10', 11' mesh with the meshing parts (not shown) of the pinion gears 12', 13' supported on the right side plate 52' of the sliding body 5, and The support parts (not shown) of the racks 10', 11' come into contact with the support parts (not shown) of the pinion gears 12', 13'.

Therefore, the cassette carrier 7 has a guidance rank of 10.
The position of the sliding body 5 of the left side plate 9 with respect to the left side plate 52 is defined by the support s78, 79 of the pinion gear 12.13 coming into contact with the support part 91.92 of the pinion gear 12.13, and the position of the sliding body 5 of the right side plate 9' is defined. The position relative to the right side plate 52' is similarly defined by the guide racks 10', 11' and pinion gears 12', 13', and the left and right side plates 9.9
' The guide rack 10 located near the front end and rear end of
and 11, 10', and 11' are meshed with two pinion gears 12, 13, and 12', 13' which are rotated in synchronization with each other, so that the position thereof is always maintained horizontally.

(d-4-d, Ease of engagement between guide rack and pinion gear) [Figures 9 and 10] By the way, since the cassette carrier guide mechanism 14, 14' is configured in this way, the guide rack 10.1
1 and 10', 11' and pinion gear 12.13 and 1
2' and 13' can be engaged very easily and without impairing the functions of these parts.

That is, two guide racks 1 located apart in the front and back direction.
0 and 11 are formed on the side plate 9, and two pinion gears 12 and 13 located apart in the front and back direction are formed on the rotating shaft 8.
8, it is not possible to adjust the distance between them. Gear teeth 93.93 of meshing part 89.90
, ..., 94.94, ..., the support part 78.79
Since a margin 80.81 is provided in which the side parts can be positioned, the reference distance L2 between the pinion gears 12 and 13 is equal to the reference path m between the guide racks 10 and 11.
Pinion gear 12. even if it is a little longer than tr.
13 gear teeth 93.93, -..., 94.94,...
This is because there is no risk that the guide rack 10.11 will collide with the support portion 78.79 of the guide rack 10.11.

In addition, as you can clearly see by looking at Figure 9, the front guide rack 1
Distance ll between the rear end of 0 and the front end of the rear guide rack 11! Since lL3 is slightly shorter than the distance L4 between the rear end of the front pinion gear 12 and the front end of the rear pinion gear 12, the distance ll! between these two! Even if the sizes of iL3 and L4 are slightly out of order, the pinion gears 12 and 13 will not collide with the outer surface of the side plate 9.

Thus, the guide rack 10.11 and the pinion gear 12.
13 can be easily engaged with each other without impairing the functions of these respective parts.

In addition, the guide racks 10' and 11' on the right side and the pinion gear 1
The same applies to the relationship between 2' and 13'.

(d-5, cassette carrier moving mechanism) [Fig. 1, 3
, FIG. 4, FIG. 6 to FIG. 8] The cassette carrier third mechanism 17 is
This is a mechanism for moving the rack 15. which is formed along the bottom surface and front end surface of the side plate of the cassette carrier 7.
15' and the feed gear 16, 16' rotatably supported by the support 6.

(d-5-a, rack) [Fig. 1, Fig. 4, Fig. 6, Fig. 7, Fig. 8.
5.95' and supporting portions 96.96' located laterally.

That is, the left rack 15 has an engaging portion 95 formed of a large number of rack teeth 97, 97, . The rack 15' on the right side is formed at a part approximately two-thirds wide on the left side of the bottom surface and front end surface of the right side plate 9'. The meshing part 9 consists of a large number of racks @97', 97',...
5' and a support part 96' continuous to the right side of the meshing part 95', and rack teeth 97.97 of the support part 96.96'.
..., 97', 97', ... support surfaces are rack teeth 9
7.97, . . . , 97', 97', . . . are located at approximately the same height as the reference pitch line.

Note that, of the rack 15.15', portions 15a, 15'a (hereinafter referred to as "horizontal portions") extending along the bottom surface of the side plate 9.9' and portions 15b, 15'b extending along the front end surface.
(hereinafter referred to as the "vertical part") is the continuous part 15
c and 15'c (hereinafter referred to as "continuous part") are formed to extend in a substantially arc shape.

(d-5-b, feed gear) [Fig. 1, Fig. 3, Fig. 4,
[Figs. 7 and 8] The feed gear 16.16' also has a meshing part 98.98' that meshes with the meshing part 95.95' of the rack 15.15', and a side part of the meshing part 98.98'. and rack 15
．． Support part 99. in contact with support part 96.96' of 15'.
99', margin parts 100, 100' located between the engaging part 98.98' and the support part 99.99', and the boss 101.
．． 101'.

That is, the left feed gear 16 has a meshing portion 98 in which a large number of gear teeth 102, 102, . . . are formed on the outer periphery thereof;
The gear 1102 is located on the left side with a phase interval from the meshing portion 98, and its outer peripheral surface (hereinafter referred to as "support surface")
．． 102, . . . are located in substantially the same plane as the reference pitch circle, and are located between the meshing portion 98 and the support portion 99, and the outer circumferential surface thereof is The recesses located on the same plane as the support surface of the support portion 99 form the tooth bottom recesses 103.1 between the gear teeth 102.102, . . .
03, . . . and a substantially cylindrical boss 101 protruding leftward from the left side surface of the support portion 99.
are integrally formed.

In addition, the right feed gear 16' has a meshing portion 9 having a large number of gear teeth 102', 102', . . . formed on its outer peripheral surface.
8' is located on the right side with a phase interval from the meshing portion 98', and its outer peripheral surface (hereinafter referred to as "support surface") corresponds to the standard pitch of the gear teeth 102', 102', . . . A slightly thick, approximately disk-shaped support portion 99' located in approximately the same plane as the circle.
The gear teeth 102', 102' are located between the meshing part 98' and the support part 99', and the outer peripheral surface thereof is flush with the support surface of the support part 99'.・・・
An allowance 1oO' that is continuous with the bottom recesses 103' and 103' between the tooth bottom concave parts 103' and a substantially cylindrical boss 101' that protrudes toward the right side from the right side surface of the support part 99' are integrally formed. Become.

In addition, the tooth width of gear teeth 102.102,..., 102', 102',... is rack 15.15.
' rack teeth 97.97,..., 97', 97',...
The width of the teeth is narrower than that of the support part 99.99'.
The width of the support surface is 96.96
It is slightly narrower than the width of the supporting surface of .

104 is a rotation axis, and the rotation f[11104 is a rotation axis fixed to the upper end of the front wall of the lower chassis 18 (not shown). The feed gear 16.1 is rotatably supported by the supporting member with its axial direction extending along the left-right direction, and the feed gear 16.1 is positioned near both left and right ends of the rotating shaft 104.
6' are fixed separately. In addition, feed gear 16.16
A press-fit hole 105.105' is formed in the axial center of ', and the feed gear 16.16' is inserted into this press-fit hole 105.105
Rotates when both left and right ends of the rotating shaft 104 are press-fitted into '! It is fixed at 1lI1104.

As shown in FIG. 1, the feed gear 16.16' has a meshing portion 98.98' whose separation distance between two side surfaces facing opposite to each other is equal to the meshing portion 95.95' of the rack 15.15'.
The distance between the two opposite sides of 11ffL!
(hereinafter referred to as the "reference distance" between racks 15 and 15') so that the component L6 is a little shorter (hereinafter referred to as "reference distance" between feed gears 16 and 16') It is fixed to a rotating shaft 104.

(d-5-c, Support of cassette carrier by feed gear) Therefore, the supporting portion 96.96' of the rack 15.15' formed on the side plate 9.9' of the cassette carrier 7 is connected to the feed gear 16.16'. The feed gear 16 is brought into contact with the support portion 99.99' of the feed gear 16.
．． It is supported so as to be supported by 16'.

Therefore, the cassette carrier 7 has its rack 15.15
The horizontal part of the support part 96.96' is the feed gear 16.16
When the feed gear 16.16' is in contact with the support portion 99.99' of the feed gear 16.16', the support portion 99.99' of the feed gear 16.16' prevents downward movement and defines the position in the vertical direction.

The position of the cassette carrier 7 in this state (hereinafter referred to as the "floated position") is the upper limit position of the vertical movement stroke of the cassette carrier 7.

Also, the supporting portion 96.96' of the vertical portion 15b115'b of the rack 15.15' is connected to the supporting portion 96.96' of the feed gear 16.16'.
9.99', a forward pressing force (this pressing force will be explained later) is applied to the cassette carrier 7 by a coil spring 29 provided externally on the guide shaft 28. Therefore, its support part 96
．． 96' is the support part 99.99' of the feed gear 16.16'
The position of the cassette carrier 7 in the front-rear direction is thereby defined.

When the feed gear 16.16' rotates, the engaging portion 95.95' of the rack 15.15' of the cassette carrier 7 is rotated.
is fed by the meshing portion 98.98' of the feed gear 16.16', thereby causing the cassette carrier 7 to move 13! j',! It will be I. Therefore, the cassette carrier 7 is placed in the horizontal section 1 of its rack 15.15'.
The meshing portion 95.95' of 5a and 15'a is the feed gear 16.95'.
When engaged with the engaging portions 98 and 98' of the rack 16', the rack 15.
15' vertical part 15b, 15"b meshing part 95.95'
is engaged with the meshing portion 98,98' of the feed gear 16,16', it will be moved eight times in the vertical direction.

(d-5-d, Ease of engagement between rack and feed gear)
[FIG. 1] By the way, since the cassette carrier 8 movement mechanism 17 is constructed as described above, the meshing between the rack 15.15' and the feed gear 16.16' is the same as that of the cassette carrier guide mechanism 14.14'. guide racks 10, 11 and 1 in
0', 11' and pinion gears 12.13 and 12', 1
The engagement and engagement with 3' can be carried out extremely easily and without impairing the functions of these parts at all.

That is, two racks 15 and 15' located apart from each other in the left-right direction are formed on the side plate 9.9' of the cassette carrier 7, and two feed gears 16.16 located apart from each other in the left-right direction are formed on the side plate 9.9' of the cassette carrier 7. ' is fixed to the rotating shaft 104, so the separation distance between them cannot be adjusted.
and the support part 99.99' is provided with a rack 15.15'.
The rack teeth 97.97 of the meshing part 95.95' of...
97', 97', . . . are provided with margins 100, 100' where parts of the supporting parts 96, 96' side can be located, so that the above-mentioned space between the racks 15 and 15' is provided. Even if the reference distance is somewhat longer than the reference pressure 11ilt La between the feed gears 16 and 16', the rack 15
．． 15' meshing part 95.95' rack teeth 97.97,
..., 97', 97', ... are feed gears 16.16
This is because there is no risk of colliding with the support portions 99, 99' of '.

(d-6, cassette carrier and sliding body) 106 (see Figure 3) is a driven gear fixed to the left end of the rotating shaft 104 to which the feed gear 16, 16' is fixed. The driven gear 106 meshes with a reduction gear 49 on the front side of the drive section 41.

Therefore, when the motor 42 rotates, the driven gear 106 is rotated, which causes the rotating shaft 104 to rotate, thereby causing the feed gear 16, 16' to rotate.

As mentioned above, the motor 42 is rotated clockwise when a loading operation is performed, and counterclockwise when an unloading operation is performed, so the feed gear 16, 16' is rotated during a loading operation. When an unloading operation is performed, it is rotated counterclockwise, and when an unloading operation is performed, it is rotated clockwise.

Thus, the cassette carrier 7 and the sliding body 5 are moved as follows.

(d-6-a, 8th shift in the loading direction) From the state where the sliding body 5 is in the pull-out position, that is, the state where the cassette carrier 7 is in the easy position, the feed gear 16.16
When ' is rotated counterclockwise, rack 15.15'
Since the horizontal portions 15a and 15'a of the cassette carrier 7 are moved rearward, the cassette carrier 7 is moved rearward while being held at its floating position, and the sliding body 5 is also moved rearward integrally with it. Ru.

When the slider 5 reaches a position slightly before reaching the retracted position, the rack 15, 15' of the cassette carrier 7
The continuous parts 15c and 15'c are feed gears 16 and 16'
From this point on, the amount of rearward sliding of the cassette carrier 7 is gradually decreased, and the amount of downward movement υ\JJ 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 30a and 30 of the guide pieces 30 and 30' formed on the upper chassis 21, which form a substantially inverted shape. 'a and the front edges 30a, 30'a
8 while touching! 1], thereby guiding the movement direction of the cassette carrier 7 so that the υ motion of the cassette carrier 7 follows a substantially inverted υ motion 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 portion 56 of the left side plate 52 is connected to the coil spring 29 fitted around the left guide shaft 28. , and begins to compress it, the repulsive force of the coil spring 29, that is, the forward pressing force is applied to the sliding body 5, and this pressing force is also applied to the cassette carrier 5. Therefore, the rack 15.15' is pressed against the feed gear 16.16', thereby causing the continuous part 15c, 15'c and the vertical part +5b, 15'b of the rack 15.15' to be pressed against the feed gear 16.16'. 16' will be securely maintained.

Then, at approximately the same time that the slider 5 reaches its retracted position, the vertical portions 15b, 15'b of the rack 15, 15' of the cassette carrier 7 begin to mesh with the feed gear 16, 16', and from this state The cassette carrier 7 is moved exclusively downward.

Note that as the cassette carrier 7 is pushed downward, the guide racks 10.11.10 formed on the side plates 9.9'
', 11' are supported by the sliding body 5, and the pinion gear 12.
13. 12' and 13' are all rotated in synchronization while being moved downward.

As shown by the two-dot chain line in FIG. 4, the upper surface of the cassette carrier 7 has a cassette positioning pin 36.3 erected from the mechanical chassis 33.
When the cassette carrier 7 descends until it is located at approximately the same height as the upper end surfaces of 6' and 37, 37', a stopper (not shown) prevents ffJ'MJ from moving further downward, thereby completing the loading of the cassette carrier 7. will reach the position.

In addition, in this state, the rack 1 of the cassette carrier 7
5.15' is 0111 above the vertical part 15b, 15'b
6 portions are meshed with the feed gear 16.16', and the upper ends of the guide racks 10.11.10', 11' are meshed with the pinion gears 12.13.12', 13'.

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 33.

(d-6-b, movement 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 above-mentioned locking means is released, and the feed gear 16.16
When ' is rotated clockwise, the vertical parts 15b, 15'b of the rack 15.15' of the cassette carrier 7 are sent upward, so that the cassette carrier 7 is moved toward the floating position.
When the rack 15.15' rises to a position slightly before reaching the floating position, the continuous portion 15C115'C of the rack 15.15' is engaged with the feed gear 16.16', so that the amount of upward movement is gradually reduced. Moreover, the amount of movement to the front will gradually increase. Therefore, from this point on, the cassette carrier 7
starts to push the sliding body 5 forward, so the sliding body 5 begins to be pushed forward from its retracted position.

And the cassette carrier 7 is placed in the rack 15.15'
The floating position is reached when the horizontal parts 15a, 15'a begin to mesh with the feed gears 16 and 16', and the slider 15 is moved exclusively forward, and the slider 15 reaches the drawn-out position. When the cassette carrier 7 reaches the eject position, forward movement is prevented, and the cassette carrier 7 reaches the eject position.

In addition, in this state, the rack 1 of the cassette carrier 7
5.15' has horizontal portions 15a and 15'a rear end portions meshed with feed gear 16.16', and guide rack 10
．． 11. The lower ends of 10' and 11' are pinion gear 1
2.13.12' and 13' are meshed.

(d-7. Loading and unloading operations of the tape cassette) The loading and unloading operations of the tape cassette 8 by the tape cassette loading device 40 configured as described above are performed as follows.

First, the loading operation will be explained.

When the loading operation is started with the tape cassette 8 placed on the cassette mounting plate 62, the sliding body 5 is moved backward by 8 vJ, and the tape cassette 8 is rotated freely to the left and right sides of the cassette carrier 7. Supported cassette presser 1
07.107', the left and right sides of the cassette case 8a are held separately.

Then, when the sliding body 5 reaches a position slightly before reaching the retracted position, the measuring rod 69 provided on the cassette carrier 7 moves to the measuring rotating pin 38 provided on the mechanical chassis 33.
By riding on the cassette case 8a, the tape cassette 8 is rotated clockwise, so that the tape cassette 8 is moved from its closed position where the front cover 108 of the tape cassette 8 is closed to the tape drawer surface of the cassette case 8a. It will begin to rotate toward the open position where the surface is opened.

From this state, the sliding body 5 moves to its retracted position, and the cassette carrier 7 is moved downward.
When the cassette carrier 7 reaches the loading completion position, the cassette case 8a of the tape cassette 8 is placed on the upper end surface of the cassette positioning bins 36, 36' and 37, 37' vertically installed from the mechanical chassis 33. , and a rear cassette positioning bin 36. is inserted into a positioning hole (not shown) formed in the bottom of the cassette case 8a.
Insertion portions 36a and 36'a formed at 36' are inserted, thereby positioning the tape cassette 8 relative to the recording/reproducing section 32 in the horizontal and height directions.

Then, the tape cassette 8 is loaded into the recording and reproducing section 32, and in this state, the tape measure 69 is rotated approximately 90 degrees clockwise, and the front fi 108 is in the open position. As a result, the tape draw-out surface of the cassette case 8a is opened in a state facing the head drum 34, and the reel stand 35. 35' reel engaging shafts 35a, 35'
a will be inserted.

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 by 8 wJ while pressing the sliding body 5, thereby causing the sliding The moving body 5 is moved to the pull-out position, and the cassette carrier 7 is moved to the eject position.

Then, while the cassette carrier 7 is moved to the floating position, the front surface M108 of the tape cassette 8 is returned from the open position to the closed position, and while the cassette carrier 7 is being moved forward, the cassette presser 107 .107'
The tape cassette 8 is released from being held by the tape cassette 8.

(G. Effects of the Invention) As is clear from the above description, the meshing type transmission mechanism of the present invention has a meshing part consisting of a plurality of teeth, and a support surface of the meshing part located on the side of the meshing part. It has two meshing members integrally formed with a support part located at approximately the same position as the reference pitch circle or reference pitch line of the part, and each of the meshing parts of the two meshing members meshes with each other, and A meshing type transmission mechanism in which the supporting surfaces are in contact with each other, the meshing type transmission mechanism having at least one of the two meshing members, a part located between the meshing part and the support part, and corresponding to at least a part between two adjacent teeth. The present invention is characterized in that a margin portion reaching a depth corresponding to the root of the tooth is formed.

Therefore, according to the present invention, there is a margin between the meshing part of at least one of the two meshing members and the support part, which is a space in which a part of the teeth of the meshing part of the other meshing member can be located. Therefore, even if the end of the meshing part of the other meshing member on the support part side is not aligned with the end of the meshing part of one meshing member on the support part side, the two meshing parts can be connected to each other. It is possible to mesh with sufficient margin.

According to the present invention, the two meshing members can be meshed with each other without difficulty even if the dimensional processing accuracy of the two meshing members and the precision of the mutual positional relationship when they are meshed with each other are not high. Can be done.

In the above-described embodiment, the allowance is formed only on one of the meshing members that mesh with each other, but the allowance may be formed on each of the two meshing members, if necessary.

Further, in the above-described embodiment, one of the two meshing members that mesh with each other is a pinion gear and the other is a rack, but the present invention is not particularly concerned with the types of the two meshing members.

[Brief explanation of drawings]

1 to 10 show an example of an embodiment in which the meshing type transmission mechanism of the present invention is applied to a cassette carrier moving mechanism and a cassette carrier guiding mechanism in a tape cassette loading device of a video tape recorder. FIG. 2 is a perspective view showing the entire video tape recorder, FIG. 3 is a plan view of the tape cassette loading device, and FIG. 5 is an enlarged perspective view of the sliding body, 6 is an enlarged perspective view of the cassette carrier, 7 is a sectional view taken along line -■ in 1, and 8 is a sectional view taken along line -IV. 9 is an enlarged side view of the cassette carrier guide mechanism, FIG. 10 is a sectional view taken along line X-X in FIG. 9, and FIG. 12 schematically shows an example of a cassette carrier moving mechanism in a tape cassette loading device, FIG. 11 is a side view, and FIG. 12 is an enlarged sectional view taken along the cutting-row line in FIG. 11. It is. Explanation of symbols 14... meshing type transmission mechanism, 10.11... one meshing member, 12.13... (other) meshing member, 76.77...
・C (of one engaging member)! Joint part, 78.79... Support part (of one meshing member), 80.81... Surplus part, 82.83... Teeth (of one meshing member), 89.90
...Matching part (of the other meshing member), 91.92... Support part (of the other meshing member), 93.94... Teeth (of the other meshing member), 17...
・Matching type transmission mechanism, 15.15'...(other) meshing member, 16.16'
...one meshing member, 95.95'... meshing part (of the other meshing member), 96.96'... support part (of the other meshing member), 97.97'... ( teeth of the other meshing member, 98.
98'... l] M joint part (of one meshing member), 99.99'... Support part (of one meshing member), 100.100'... Surplus part, 102.102'. ... Teeth (of one meshing member) "0 0 1'-1\X - 〇のト"■0Riri11+■0

Claims (1)

[Scope of Claims] A meshing part consisting of a plurality of teeth and a support part located on the side of the meshing part and whose supporting surface is located at approximately the same position as the reference pitch circle or reference pitch line of the meshing part are integrated. 2 formed in
The meshing type transmission mechanism includes two meshing members, the meshing parts of the two meshing members mesh with each other, and the support surfaces of the respective support parts are in contact with each other, wherein at least one of the two meshing members has the meshing part. and a supporting portion, and a margin portion having a depth corresponding to the root of the tooth is formed at least in a portion corresponding to a portion between two adjacent teeth. mechanism