JPH0448487A - Deck construction for magnetic tape recording and reproducing device - Google Patents

Abstract

PURPOSE:To make the magnetic tape recording and reproducing device thin and compact by turning the construction of a deck to double construction composed of an upper main deck and a lower deck below and arranging a driving mechanism in the space between these main and lower decks. CONSTITUTION:A deck 1 is in a box-shaped by overlapping an upper main deck 1a and a lower deck 1b below while forming a prescribed space, and among the upper surface of the main deck 1a, the half of the nearer side, namely, the surface overlapped with this tape cassette 2 when boarding the tape cassette 2 is turned to be almost flat. Only the supply reel stand 3a and the winding reel stand 3b are projected from the upper surface of the main deck 1a. Thus, the entire cassette can be made thinner. The device can make compact since arranging a driving mechanism 30 in the space between the main deck 1a and the lower deck 1b.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a deck structure in a magnetic tape recording/reproducing apparatus such as a video tape recorder (VTR).

(Prior Art) Conventionally, in magnetic tape recording and reproducing devices such as VTRs, main mechanisms such as a drum with a rotating magnetic head, a reel stand for rotating the reel of a tape cassette, a tape loading mechanism, and a tape running mechanism have been used. The device is constructed by attaching the screws and other members to the top and bottom surfaces of a single deck.

(Problems to be Solved by the Invention) If various mechanisms and members are attached to the upper and lower surfaces of one deck as in the conventional device, assembly is troublesome, and the members are attached exposed. may be damaged or foreign objects may become trapped, causing a malfunction.
Furthermore, the overall rigidity is low, and there is little freedom in the arrangement positions of the members. In addition, it looks bad because each member is completely visible.

(Means for Solving the Problems) In order to solve the above problems, the present invention provides a deck that supports main members and mechanisms with a double structure consisting of an upper main deck and a lower lower deck, and a space between the main deck and the lower deck. The drive mechanism was placed in this space.

(Function) Most of the main components other than components that require a height greater than the tape width, such as the rotating drum, pinch roller, capstan, and reel stand, are placed in the space between the main deck and the lower deck and are hidden from the outside. .

(Example) Embodiments of the present invention will be described below with reference to the accompanying drawings.

Fig. 1 is a longitudinal sectional view of the deck, and Fig. 2 is a plan view of the deck showing the state before tape loading. The front half of the upper surface of the main deck 1a, that is, the surface that overlaps with the tape cassette 2 when the tape cassette 2 is loaded, is approximately flat, and only the supply reel stand 3a and take-up reel stand 3b are the main deck. It is made to protrude from the upper surface of the deck 1a. By making the surface that overlaps the tape cassette 2 substantially flat in this way, the main deck 1a can be brought to the edge of the cassette, making it possible to make the entire set thinner, and furthermore, the mechanical parts are hidden as much as possible. , it is possible to improve the appearance in the se soto state.

Also, the depth side half of the upper surface of the main deck 1a (second
A drum 4 equipped with a rotating magnetic head is arranged on the left side in the figure, and guide holes 5 and 4 are arranged around the drum 4.
5 is formed on the main deck 1a, and a loading base 8 having a loading pole 6 and an inclined pole 7 is slidably engaged with the guide hole 5.

Further, in the remaining portion of the upper surface of the main deck 1a, that is, the depth portion on the opposite side to the side where the drum 4 is arranged, members that require a height greater than the tape width are concentratedly arranged. Specifically, a capstan 9, a pinch roller 10. Guide pole 11, No. 1 - Floating pole 12 and A/C
A head 13 is arranged. The A/C head 13 is fixed to the upper surface of the main deck 1a, the capstan 9 is rotated by a capstan motor 14 placed in the space between the main deck 1a and the lower deck 1b, and the pinch roller 10 is rotated about a shaft 15. The pinch roller arm 16 is connected to the tip of a lever 17. Further, the guide pole 11 is attached to the tip of a guide pole arm 19 that swings around an axis 18, and the half-loading pole 12 is attached to the tip of an arm 21 that swings around an axis 20. The tip of a lever 23 supported by the shaft 22 is locked.

Here, the capstan 9 of the capstan motor 14
In addition, as shown in FIG. 7, it is transmitted via a belt 24 to a reel clutch 25 attached to the lower surface of the main deck 1a, and this reel clutch 25 swings left and right in response to forward and reverse rotation of the capstan motor 14. The small gears 26a and 26 mesh with the gear portion of the reel clutch 25.
One of the tapes b is selectively engaged with a gear portion of the supply reel stand 3a or the take-up reel stand 3b to feed or rewind the tape.

The other ends of the lever 17, guide pole arm 19, and lever 23 are connected to a drive mechanism 30 disposed in a space between the main deck 1a and the lower deck 1b.

The main part of the drive mechanism 30 is constituted by a gear train that transmits the driving force of the motor 31 shown in FIG. That is, the gear train transmits the rotation of the motor 31 to the reduction gear 33 via the worm 32, and the rotation of this reduction gear 33 is transmitted to the reduction gear 34.
The rotation of the reduction gear 34 is transmitted to the first cam gear 35. He is trying to transmit it to the 2nd cam gear 36 and the 3rd cam gear 37 sequentially. In addition, when comparing each cam gear, the first
Cam gear 35 has the smallest diameter, second cam gear 36 and third cam gear 35 have the smallest diameter.
The cam gears 37 have the same diameter, and the third cam gear 37 has a built-in rotary encoder.

Next, the relationship between each of the cam gears 35, 36, 37 and the members operated by these cam gears will be explained.

FIG. 4 is a plan view of the first cam gear 35 and the members operated by the first cam gear 35. On the back surface of the first cam gear 35, cams 35-1 and 35-2 are provided. cam 3
5-1 is a discontinuous convex strip, and one end of the sub-brake arm 35-3 and the pole base Leno<-35-4 come into contact with each other.

The sub brake arm 35-3 has a brake shoe 3 at the tip.
5-5, is rotatably supported by a shaft 35-6, and urged clockwise in the figure by a spring 35-7.

The pole base lever 35-4 is provided with a groove 35-8 into which the pole base of the loading arm is inserted, is rotatably supported by a shaft 35-9, and is supported by a spring 35-1.
0, it is biased counterclockwise in the figure.

The cam 35-2 is attached to the center of the cam gear 35, and a cancel arm 35-12 that is rotatable about a shaft 35-11 is in contact with the cam 35-2. Further, on the lower deck 1b, a transformer arm 35-14 is biased clockwise by a spring 35-15 around a shaft 35-13, and a gear provided on the shaft of a tension arm 35-16 is connected to a gear of this transformer arm 35-14. mesh,
A tension pole 35-17 is inserted into the tip of the tension arm 35-16.

As shown in the mechanical mode table in FIG. 8, when the eject button of the magnetic tape recording/reproducing device is pressed, the cam gear 35 rotates counterclockwise from the reference position shown in FIG.
28,3°). With this rotation, the pawl base lever 35-4 engages with the cam 35-1 of the first cam gear 35 and rotates clockwise to position the loading pawl base 8.

Further, when the first cam gear 35 rotates clockwise from the reference position shown in FIG. 4 and enters the 5TOPI, 2 mode or loading mode, the sub brake arm 35-3 comes off the cam and swings clockwise to apply the brake. It takes.

Furthermore, due to the clockwise rotation of the first cam gear 35, the PLA
When in Y or 5LOWFOR mode, cam 35-
The cancel arm 35-12 that engages with the transformer arm 35-12 swings and comes off the transformer arm 35-14, and the spring 35-1
5, the transformer arm 35-14 rotates clockwise, and this rotation causes the tension arm 35-16 to swing counterclockwise to apply a constant tension to the tape T.

FIG. 5 is a plan view of the second cam gear 36 and the members operated by the second cam gear 36. A cam groove 36-1 and a protrusion 36-2 are formed on the upper surface of the second cam gear 36.
Cam grooves 36-3 and 36-4 are formed on the back surface.

One end of an arm gear 36-6 rotatably supported around a shaft 36-5 is engaged with the cam groove 36-1 via a pin 36-7, and a gear 36-8 of this arm gear 36-6 is engaged with the cam groove 36-1.
As shown in FIG. 7, it engages with one of the loading gears 36-9, 36-9 attached to the lower surface of the main deck 1a, and there is a joint in the middle part of the shaft of these loading gears 36-9, 36--9. loading arm 36-1 having
0°36-10 is integrally attached, and the loading base 8 described above is attached to the tip of each loading arm 36-10.
is installed.

A pair of sub-brake arms 36-15 and 36 on the take-up side are attached to the lower surface of the main deck 1a via a shaft 36-14.
-16 is supported via a spring 36-17, and one arm 36-15 has its rear end attached to the protrusion 36-15.
The other arm 36-16 is provided with a brake shoe 36-18 at its tip and urged counterclockwise by a spring 36-19.

The base end of the lever 36-21, which is rotatably supported around the shaft 36-20, is engaged with the cam groove 36-3, and the tip of the lever 36-21 is placed on the front side of the lower deck 1b. It is connected to a slide plate 36-22 which is slidably disposed on the slide plate 36-22. The top surface of the slide plate 36-22 has an F/
The R plates 36-23 are stacked on top of each other, and the F/R plate 36-23 and the slide plate 36-22 are engaged with each other at a joint member 36-24. Then, the main brake 36-25 and a part of the reel gear 36-26 are engaged with the slide plate 36-22 and the F/R plate 36-23, and the slide plate 36-22 and the F/R plate 36-23 are slid. By doing so, a predetermined operation, which will be described later, is performed.

The cam groove 36-4 has a shaft 36-2 on the back side of the lower deck 1b.
Eject lever 36- rotatably supported by 7.
28 are engaged with each other.

This eject lever 36-28 forcibly locks the cassette housing.

Thus, the second cam gear 36 rotates counterclockwise (-90
°) and enters the FF or REW mode, the lever 36-21 that engages with the cam groove 36-3 of the second cam gear 36 swings clockwise, and the slide plate 36-22 and
/R plate 36-23 moves and reel gear 36-2
6 engages with the clutch gear and the gears of the supply reel stand 3a and the take-up reel stand 3b to prevent slippage. Also,
When the stop button is pressed during FF or REW, the reel gear 36-26 is disengaged, and at the same time the main brake 36-25 is activated to stop the supply reel stand 3a and the take-up reel stand 3.
Stop the rotation of b.

Further, when the second cam gear 36 rotates clockwise (25 degrees) from the reference position shown in FIG. 4 to enter the EJECT mode, the eject lever 36-28 engages with the cam groove 36-4 of the second cam gear 36, Rotate counterclockwise to release the cassette housing from the closed position, and the spring force will cause the cassette housing to rise.

FIG. 6 is a plan view of the third cam gear 37 and the members operated by the third cam gear 37. Cam grooves 37-1.37-2.37-3 are formed on the upper surface of the third cam gear 37, and An outer diameter cam 374 is formed in the outer diameter cam 374.

The base end of the guide arm 19 provided on the upper surface of the main deck 1a is engaged with the cam groove 37-1, one end of the lever 23 is engaged with the cam groove 37-2, and the cam groove 37-3 is engaged with the base end of the guide arm 19 provided on the upper surface of the main deck 1a. engages the intermediate portion of the lever 17, and further engages the intermediate portion of the capstan brake lever 37-5 with the outer diameter cam 37-4.

Then, the third cam gear 37 rotates clockwise to 5TO.
In the PI mode, the cam groove 37- of the third cam gear 37
No. 1-loading arm 37-10, which engages No. 2, swings clockwise to pull out the tape to the half-loading position. Also, the third cam gear 37 rotates clockwise to PLAY.

5LOWFORXSLOWREV or It RE
When the V mode is entered, the lever 17 that engages with the cam groove 373 of the third cam gear 37 swings to run the tape between the pinch roller 10 and the capstan 9, and the
In the TOP2 mode, the cam groove 3 of the third cam gear 37
The guide arm 19 that engages with the id pole 11
guides the tape, and in 5LOWFOR, 5TOP2 or 5LOWREV mode, the outer diameter cam 37-
The capstan brake lever 37-5 that contacts the capstan brake lever 37-5 contacts the capstan motor 14, prevents the capstan motor 14 from reversing or rotating excessively during slow intermittent feeding, and ensures reliable movement.

Reduce the tape running speed to a certain value.

(Effects) As explained above, according to the present invention, the deck has a double structure consisting of an upper main deck and a lower lower deck, and a tape loading mechanism, a tape running mechanism, etc. are installed in the space between the main deck and the lower deck. Since the drive mechanism for operation is arranged, the drive mechanism is easy to assemble, and the degree of freedom in arranging the members is increased, and three-dimensional arrangement is also possible. Therefore, the unreasonable arrangement of members is eliminated, and the device can be made thinner and more compact.

In addition, since the deck itself is box-shaped, its rigidity is increased, and since dust and foreign matter do not enter from the outside, it is less likely to break down.

Furthermore, in sets where the internal mechanical parts of camera-integrated VTRs, portable VTRs, etc. are completely visible, the mechanical parts are no longer visible, which can greatly contribute to the design of the set.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of the deck, Fig. 2 is a plan view of the deck showing the state before tape loading, Fig. 3 is a plan view of the gear train that constitutes the drive mechanism, and Fig. 4 is the first cam gear and its FIG. 5 is a plan view of the second cam gear and the members operated by the second cam gear; FIG. 6 is a plan view of the third cam gear and the members operated by the third cam gear. , FIG. 7 is a plan view of the loading mechanism and reel clutch attached to the lower surface of the main deck, and FIG. 8 is a mechanical mode table. 1... Deck, 1a... Main deck, 1b...
Lower deck, 3a... Supply reel stand, 3b... Take-up reel stand, 4... Drum, 6... Loading pole, 9... Capstan, 10... Pinch roller,
30... Drive mechanism.

Claims (1)

[Claims] A drum with a rotating magnetic head, a reel stand that rotates the tape cassette reel, a tape loading mechanism,
In a magnetic tape recording and reproducing device in which a tape running mechanism and its peripheral members are supported on a deck, the deck consists of an upper main deck and a lower lower deck, and the tape loading mechanism and the tape loading mechanism are installed in the space between the main deck and the lower deck. A deck structure for a magnetic tape recording/reproducing device, characterized in that a drive mechanism for operating a tape running mechanism, etc. is arranged.