JPH029049A - Tape loading device - Google Patents

Abstract

PURPOSE:To thin the whole device by providing a thin gear group on the upper face side of a main chassis and placing compactly the remaining gear group and an electric circuit board on the lower face of the main chassis. CONSTITUTION:A cam gear 3 for constituting an upstream gear group of a tape loading mechanism 2 is provided on the lower face of a main chassis 1, and an input gear 23, the first ring driving gear 24 and the second driving gear 25 for constituting a downstream gear group are provided on the upper face of the main chassis 1 covered with a sub-chassis 11. Also, a relay gear 4 is placed in a raised opening part 14 which has been formed by bring a part of the main chassis 1 to press working, the upper stage gear part 41 protruded so as to face the upper face of the chassis from this opening is engaged to an input gear 23, and the lower stage gear part 42 is engaged to the cam gear 3. In such a way, by placing a thin gear group and the remaining gear group on the upper face side of the chassis 1 and the lower face side, respectively, the whole device can be thinned.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a tape loading device for winding a magnetic tape around a rotating head cylinder in a tape recorder such as a VTR.

(Prior Art) In a VTR, in order to pull out a magnetic tape from a tape cassette loaded in the device and wrap it around a rotating head cylinder at a predetermined angle, a rotating head cylinder (6) is used as shown in Figure 2. A pair of leading guide bodies (21) and (22) that move back and forth along the cylinder peripheral wall are arranged on both sides of the cylinder.

In conventional stationary VTRs, the chassis itself, in which various mechanisms are installed, has a pair of guide rails (12) (13) that extend along the circumference of the rotating head cylinder.
is opened, and the pair of leading guide bodies (21
) (22) was slidably fitted.

(Problem to be solved) However, as VTRs have become smaller and lighter in recent years, it has become necessary to make the thickness of the chassis as thin as possible. When opened, there was a problem that the rigidity of the chassis itself decreased.

Therefore, a VTR has been proposed which employs a double chassis structure consisting of a main chassis and a sub-chassis, and has a pair of guide grooves in the sub-chassis (see, for example, Japanese Patent Application Laid-Open No. 58-220264 [G11B15/66]).

However, in the above-mentioned VTR, the entire tape loading mechanism that drives the pair of leading guide bodies is disposed between the main chassis and the sub-chassis, so the distance between the two chassis is determined by the maximum height of the tape loading mechanism. stipulated by. Normally, in the gear mechanism that makes up the side of the tape loading R, the gear on the upstream side near the loading motor is formed in a large size because it is necessary to decelerate the rotation of the motor. Since the reel stand brake mechanism is often formed with a cam part etc. for transmitting power, the entire gear is thicker than the downstream gear, and as a result, the gap between the two chassis becomes larger and the distance between the two chassis increases. This creates wasted space in between.

On the other hand, as VTRs have become more multi-functional in recent years, the space for placing electric circuit boards has expanded, but it is desirable to consolidate the electric circuits onto a single board.
In terms of -a, the circuit board is placed on the bottom surface of the main chassis where a relatively large space can be secured. Since the circuit elements on the board have different height dimensions, the thickness of the board space is defined by the tallest circuit element, and there is wasted space around the shorter circuit elements.

For these reasons, conventional V with dual chassis structure
It has become difficult to make TRs smaller and thinner.

An object of the present invention is to arrange the gear mechanism constituting the tape loading mechanism across both sides of the main chassis, thereby compactly disposing the gear group on the downstream side near the leading guide body between the two chassis. The spacing between the chassis can be made as narrow as possible, and the gear group on the upstream side near the loading motor is placed on the bottom of the main chassis. To provide a tape loading device that can be arranged without taking up space.

Means for Solving the Problems) In the tape loading device according to the present invention, a loading motor (5) and a leading guide body (21) (22)
The gear mechanism to be interposed between the two is an upstream gear group near the loading motor, a downstream gear group near the leading guide body,
It is composed of a relay gear (4) that connects both gear groups to each other.

The lower gear group is arranged on the upper surface of the main jersey (1), and the upstream gear group is arranged on the lower surface of the main chassis. The relay gear (4) includes an upper gear portion (41) that protrudes from the top surface of the main chassis (1) and meshes with the downstream gear group;
The main chassis (1) includes a lower gear portion (42) that projects from the lower surface and meshes with an upstream gear group.

Further, a space (8) for arranging an electric circuit board is formed on the lower surface of the main jersey (1).

(Function) The downstream gear group constituting the tape loading mechanism needs to transmit power only to the leading guide body, so for example, as shown in Fig. 1, spur gears (23), (24), (25) etc. are connected to the main chassis (1) and the sub-chassis (11), and thereby the distance between the two chassis (1) and (11) can be made wider than before.

In addition, on the bottom surface of the main chassis (1), there is a downstream gear group (23) with the main chassis (1) in between, as shown in Figure 1.
24) A sufficiently large space (8) remains, including the empty space on the opposite side from (25). Therefore, by arranging the electric circuit board in this space (8), there will be no wasted empty space on both sides of the main chassis (1).

(Effects of the Invention) According to the tape loading device according to the present invention, the thin gear group is arranged on the upper surface side of the main chassis (1), and the remaining gear group and the electric circuit board are arranged on the lower surface of the main chassis (1). Since it can be arranged compactly, the entire device can be made thinner.

(Example) Hereinafter, an example in which a tape loading device according to the present invention is implemented in a VTR will be described in detail.

The examples are for illustrating the present invention, and should not be construed to limit or reduce the scope of the invention described in the claims.

Figure 2 shows the main chassis (1) and sub-chassis (1).
1) Shows the overall configuration of the tape loading mechanism installed above.

On the main chassis (1) are a supply reel stand (7) and a take-up reel stand (7) on which tape cassettes are set.
1) and an oscillating idler machine ti (72) for driving these reel stands.

Further, a rotating head cylinder (6) is arranged deeper than the reel stand (7) (71), and a sub-chassis (11) is removed to surround the rotating head cylinder (6). .

The subchassis (11) has a rotating head cylinder (6
) and a second guide groove (12) extending along the circumferential surface of the
Guide grooves (13) are formed, and a first leading guide body (21) and a second leading guide body (22) for pulling out the magnetic tape from the tape cassette are slidably fitted into these guide grooves. .

Catchers (16) and (17) for positioning the first and second leading guide bodies (21) and (22) are provided at the end portions of the first and second guide sections (12) and (13), respectively. There is.

Further, at a predetermined height position on the sub-chassis (11), a second
An audio control head (61) for recording and reproducing audio signals and control signals is arranged opposite to the guide barrel (13).

FIG. 4 omits the main jersey (1) and sub-chassis (11) from FIG. 2 and shows only the drive system of the tape loading mechanism.

The output shaft of a loading motor (5) that serves as a power source for the tape loading mechanism (2) is connected to a worm gear (52) via a boolean mechanism (51).
2) is meshing with the cam gear (3). Cam gear (3)
A spiral cam groove (34) is recessed in the side surface of the reel, and a cam follower (34a) connected to a reel stand brake I (not shown) or the like is engaged with the cam groove (34).

Cam gear (3), relay gear (4), input gear (23)
, a first ring drive gear (24), and a second ring drive gear (25), the first and second loading rings (26) are disposed around the rotating head cylinder (6).
) is connected to (27). 1st ring drive gear (2
4) meshes with the 10th deing ring (26), and the 2nd
The ring drive gear (25) is the 20th deing ring (2
)).

The first and twentieth deing rings (26) (27) are rotatably supported by a plurality of support gears (28) disposed on the main chassis (1) as shown in FIG.
The 10th deing ring (26) has a first connecting piece (2
The first leading guide body (21) is connected via 9a),
The 20th deing ring (27) has a second connecting piece (2
A second leading guide body (22) is connected via the tube 9b).

Therefore, the pair of loading gears (26) and (27) are rotated in opposite directions by the driving of the loading motor (5), and the first and second leading guide bodies (21) ( 22) moves back and forth along the guide grooves (12) and (13).

As shown in FIGS. 1 and 6, the cam gear (3) constituting the upstream gear group of the tape loading mechanism (2) is disposed on the lower surface of the main chassis (1), and the input gear constituting the downstream gear group. (23), the first ring drive gear (24), and the second ring drive gear (25) are connected to the subchassis (11).
) is arranged on the upper surface of the main chassis (1) covered by the main chassis (1). Further, the relay gear (4) is arranged in a raised opening (14) formed by pressing a part of the main chassis (1), and the upper gear part (41) exposed from the opening to the upper surface of the chassis is input. gear (23) and lower gear part (4).
2) is meshed with the cam gear (3).

As shown in Figure 2, the audio control head (
61), there is an inclined guide lever (91) equipped with an inclined guide (91) for stretching the magnetic tape along a predetermined running path.
9) is arranged rotatably about a support shaft (90). As the tilt guide lever (9) rotates clockwise as shown in Fig. 3, it enters the gap between the subchassis (11) and the audio control head (1), and the audio control head is rotated clockwise. The end of rotation is regulated by a first stopper (15) provided on the support base (61). Also, the counterclockwise rotation end is the sub-chassis (
11) Regulated by a second stopper (18) provided above.

Figures 2 to 4 and Figure 10 (-) (b) (c)
As shown in the figure, the inclined guide (9) of the inclined guide lever (9)
A bottle (9a) is provided protruding from the free end opposite to 1), and the bottle (9a) is loosely fitted into one end of the link (93). A shaft piece (93a) is provided protrudingly from the other end of the link (93).
93a) is engaged with a C-shaped groove (92a) recessed in the side surface of the lever drive gear (92). Lever drive gear (
92) is called the 20th Deingling (27). Further, the inclined guide lever (9) is forced to rotate counterclockwise by the torsion spring (94), and a coil bar = r-(95) is formed between the pin (9a) of the inclined guide lever (9) and the link (93). ).

20 - In the tape loading operation in which the lever drive gear (9Z) is rotated clockwise by the counterclockwise rotation of the deing ring (27), at the start of loading, the link is as shown in Fig. 10 (a). The shaft piece (93a) of (93) is located at the clockwise end of the groove (92a) of the lever drive gear (92). From this state, the lever drive gear (9z) rotates clockwise, so that the counterclockwise end of the groove (92a) is connected to the shaft piece (93) as shown in FIG. 10(b).
a).

In the process from FIG. 10(,) to FIG. 10(b), the inclined guide lever (9) does not rotate, but the second leading guide body 22) shown in FIG.
61) has already passed through the vicinity.

As shown in Figure 10 (11) (C), the lever drive gear (9
2) further rotates clockwise, the link (9
3) is pulled downward, and accordingly, the inclined guide lever (9) is rotated clockwise against the torsion spring (94). As shown in FIG. 3, with the end of the inclined guide lever (9) in contact with the stopper (15), the inclined guide (91) is installed on a predetermined tape running path. In addition, the inclined guide (91) has a second leading guide body 22) connected to the audio control head (61).
After passing near, the inclined guide (91) and the second leading guide body 22) do not interfere with each other because they pass through the same space.

As shown in FIG. 3, the tape loading operation is completed when the first leading guide body (21) and the second leading guide body 22) hit the catchers (16) and (17) and are stopped.

Thereafter, the loading motor (5) continues to rotate, and the rotation of the cam gear (3) drives the cam follower (34a) shown in FIG. 4, thereby realizing various device modes such as normal playback mode and stop mode.

In this process, the connection between the cam gear 3) and the relay gear 4) is disconnected, and the first and second leading guides 14c (21)
In order to stop the movement of (22), the cam gear (3) and the relay gear 4) are
) (b).

That is, the cam gear (3) is formed with an upper gear portion (31) that meshes with the relay gear (4) over an angular range of approximately 155 degrees, and a lower gear portion that meshes with the worm gear (52). (32) is formed around the entire circumference, and the gear portion (3
An arcuate rib (33) having a slightly smaller diameter than the root circle of 1) is formed to protrude upward from the side surface of the gear.

On the other hand, the relay gear (4) has a pair of engagement pieces (2) on the body between the upper gear part (41) and the lower gear part (42) that are in contact with the outer peripheral surface of the rib (33). 43) (44> is provided protrudingly.

FIG. 7(a) (+3) shows the state immediately before tape loading starts, and the engagement piece (43) (4) of the relay gear (4) is shown in FIG.
4) faces the rib (33) of the cam gear (3), thereby restricting the free rotation of the relay gear (4).

When the cam gear (3) rotates clockwise from this state,
As shown in Fig. 8 (a) (1)), the rib (33) separates from the engaging pieces (43) (44), and the cam gear (3)
The upper gear part (31) is connected to the lower gear part (
42) to rotate the relay gear (4) counterclockwise. As a result, the tape loading operation is performed.

FIGS. 9(a) and 9(b) show the state immediately after tape loading is completed, and the upper gear portion (31) of the cam gear (3) has disengaged from the lower gear portion (42) of the relay gear (4). ,
The engagement pieces (43) (44) of the relay gear (4) face the rib (33) of the cam gear (3). This prevents the relay gear (4) from freely rotating again.

The cam gear (3) further rotates clockwise from the state shown in FIG. 9 (a>(b)), and various device modes are realized in the process of returning to the state shown in FIGS. 7 (a) and (11). During the period,
The relay gear (4) maintains a stopped state with the engagement pieces (43) (44) facing the rib (33) of the cam gear (3).

Therefore, the first and second leading guide bodies (21
) (22) to the catchers (16) and (17) without strain.

In the above tape loading device, as shown in FIG. 1, an input gear (23), a first ring drive gear (24)
, and the second ring drive gear (25) are each composed of thin spur gears, so the space between the sub chassis (11) and the main chassis (1) can be designed to be narrow, and the distance between the main chassis (1) and the main chassis (1) can be narrow. Since a sufficient board space (8) can be secured on the opposite side of the board, this is extremely effective in making the device thinner.

Further, the power transmission path from the loading motor (5) to the loading rings (26) and (27) is entirely constituted by a gear mechanism, and no cam mechanism is involved, so that high power transmission efficiency can be obtained.

The drawings and the description of the above embodiments are for illustrating the present invention, and do not limit the invention described in the claims.
Nor should it be construed as limiting the scope.

Further, it goes without saying that the configuration of each part of the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the technical scope of the claims.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing the main parts of the tape loading device;
Fig. 2 is a plan view of the tape loading device when loading starts, Fig. 3 is a plan view of the tape loading device when loading is completed, Fig. 4 is a plan view showing only the drive system of the tape loading mechanism, and Fig. 5 is a plan view of the tape loading device when loading is completed. 6 is an enlarged perspective view showing the main parts of the tape loading mechanism; FIGS. 7(a) and 7(b) are plan views of the cam gear and relay gear immediately before loading starts; The sectional view, FIGS. 8(a) and 8(b) are the same plan view and sectional view during loading, and FIG. 9(a) (
10b) is a plan view and a cross-sectional view of the loading completion straight line, and FIGS. 10(a), 10(b), and 10(c) are a series of plan views showing the operation of the inclined guide lever. (1) Main chassis (11) Sub chassis (3) Cam gear (4) Relay gear (21) (22) Leading guide body 23)
... Input gear (26) (27) ... Loading ring (5) ... Loading motor <6) ... Rotating head cylinder Fig. 8 Fig. 8 [2] (δ) rYIl Fig. 6

Claims (1)

[Claims] [1] Guide grooves (12) and (13) are provided in the sub-chassis (11) provided on the main chassis (1) along the peripheral wall of the rotating head cylinder (6), and the magnetic tape is inserted into the guide groove. Leading guide bodies (21) and (22) for winding the rotary head cylinder around the rotating head cylinder are slidably engaged, and the leading guide body (2
1) In a tape recorder that reciprocates (22), the loading motor (5) and the leading guide body (21)
The gear mechanism interposed between (22) is composed of an upstream gear group near the loading motor, a downstream gear group near the leading guide body, and a relay gear (4) that connects both gear groups to each other. , the downstream gear group is arranged on the upper surface of the main chassis (1), the upstream gear group is arranged on the lower surface of the main chassis (1), and the relay gear (4) is exposed to the upper surface of the main chassis (1) and connected to the downstream gear. Upper gear part (41) that meshes with the group
and a lower gear part (42) that protrudes from the bottom surface of the main chassis (1) and meshes with the upstream gear group, and a space (42) for arranging an electric circuit board on the bottom surface of the main chassis (1).
8) A tape loading device comprising: