JPH0442741B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a tape roller that pulls out a tape from a tape cassette using a tape guide that is moved along a predetermined movement path and loads the tape in a helical manner onto the circumferential surface of a rotating head drum. This invention relates to a deing device.

Configuration of Conventional Example and Its Problems A conventional tape loading device will be described with reference to FIG. Fig. 1 is a schematic diagram of a tape loading device for a conventional video tape recorder (hereinafter referred to as VTR). 4 is a tension post that is rotatably supported by the chassis; 5 is a P1 post that is rotatably supported by a fixed shaft (not shown) installed in the chassis; 6 is a full-width erasing head; 7 and 11 are tape guides for pulling out the magnetic tape 3 from the video cassette 2; 8 and 10 are inclined posts installed opposite to the tape guides 7 and 11; and 12 is an impedance roller rotatably supported on the chassis. , 13 is an audio oil race head, 14 is an audio control head,
15 is a magnetoresistive head (MR head), 16 is a
P4 post, 9 is a rotary head drum equipped with a rotary head (not shown), 18 is a pinch roller that can press against and separate from the capstan 17 to run or stop the magnetic tape 3, and 19 is a P5 rotatably supported by the chassis. 21 is a supply side tape guide support member, 22 is a take-up side tape guide support member, and 23 to 26 are loading arms. When switching to the tape loading mode, the loading arms 24 and 26 are rotated by a loading motor (not shown) as shown by arrow B, thereby supporting the supply tape guide support member 21 and the take-up tape guide. The member 22 is pulled out along a guide groove (not shown) as indicated by arrow C, and the magnetic tape 3 is loaded onto the circumferential surface of the rotary head drum 9 in a helical shape.

As described above, in the conventional tape loading apparatus, the loading arms 23 to 26 overlap with the video cassette during unloading, resulting in space loss, which is a major hindrance to miniaturization of the apparatus. Also, due to the friction between the tape guide support members 21, 22 and the guide groove during loading, the tape guide support members 21, 22,
There was a problem that the loss of the transmission force to 22 was large and the moving operation was not performed smoothly.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned conventional drawbacks, and aims to provide a tape loading device that can minimize space loss and realize smooth tape loading with little transmission loss. purpose.

Structure of the Invention In order to achieve the above object, the loading device of the present invention includes a tape guide that pulls out a tape from a tape cassette by moving along a predetermined movement path and loads the tape onto the circumferential surface of a rotating head drum in a helical shape; A large gear disposed on the substrate along the predetermined movement path, a tape guide support member supporting the tape guide and having teeth, and two gears having different numbers of teeth are coaxially fixed to each other. and a two-stage gear in which one gear meshes with the large gear and the other gear meshes with the teeth of the tape guide support member, and the two-stage gear is caused to roll and rotate along the large gear. By doing so, the tape guide support member, which is in mesh with the two-stage gear on the opposite side of the large gear, is moved in the direction in which the two-stage gear moves.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a schematic plan view of a tape loading device for a VTR according to an embodiment of the present invention in an unloading state, FIG. 3 is a schematic plan view of the same device in a tape loading completed state, and 9 is a rotary head drum. Therefore, when running the tape during recording and playback,
The upper drum and lower drum are fixed, and only the head mounting bar 27 to which the rotary head is attached rotates to perform recording and playback. Also, this rotating head drum 9
is partially D-cut, and when the video cassette 2 is installed in the VTR, the D-cut portion is located on the side of the video cassette 2, and rotates in the direction of arrow A at the same time as tape loading, and the rotating head drum 9 is inserted into the video cassette 2 and fixed at the position shown in FIG. 39 is a capstan motor having a capstan 17, and a pinch roller 18.
is crimped to the capstan 17 to control the tape speed, 28, 8, 10, 40 are inclined posts, 29, 30, 7, 11, 38, 42,
41 is a tape guide. In FIGS. 3 to 5, 34 is a pinion whose shaft is fixed on a substrate. Reference numerals 44 and 43 designate loading arms having teeth that mesh with the small gear 34, and the two-stage gears 33 and 35 are arranged at one end by support shafts 53 and 52, and the two-stage gears 33 and 35 are arranged on the lower side of the two-stage gears 33 and 35. The gears mesh with large gears 31 and 37 installed on the substrate along predetermined movement paths of the tape guides 7 and 11.
Reference numerals 45 and 46 designate loading arms having teeth that mesh with the upper gears of the two-stage gears 33 and 35, and the two-stage gears 32 and 36 are connected to support shafts 54 and 55 at one end.
The lower gears of the two-stage gears 32 and 36 and the large gears 31 and 37 are in mesh with each other. 2
Reference numerals 1 and 22 designate tape guide support members each having teeth that mesh with the upper gears of the two-stage gears 32 and 36, tape guides 7 and 1, and inclined posts 8 and 10, respectively. In FIG. 6, 47 is a loading motor equipped with a worm 48. The worm 48 meshes with a worm gear 50. 57
is a pin provided on the worm gear 50, and the pin 57 and the loading arm 45 are connected to the connecting rod 4.
They are connected by 9. 51 is a lever that rotates around a fulcrum 56 and includes a tape guide 30 and an inclined post 28.

Next, the operation will be explained. When video cassette 2 is not attached to the VTR, load arm 4
3, 46, 44, 45 and tape guide support members 21, 22 are stored in an overlapping manner as shown in FIG. Next, from this state, video cassette 2
When attached to the VTR, loading motor 47
operates, and the worm gear 5 is activated via the worm 48.
0 rotates counterclockwise and connects the connecting rod 49 in the direction of arrow B.
(FIG. 6) direction, and the loading arm 45 is moved in the tape loading direction. As a result, the loading arm 45 in FIG.
The two-stage gear 32 provided on the board is fixed on the board and rotates counterclockwise by the large gear 31, and the tape guide support member 21, which is engaged with the two-stage gear 32 on the opposite side of the large gear 31, is rotated by the rollers. According to the principle, it moves in the tape loading direction, moves to the position 21a, and is fixed. At the same time, the two-stage gear 33 located between the loading arm 45 and the large gear 31
And the loading arm 44 moves in the tape loading direction based on the same principle. That is, in the state shown in FIG. 2, the loading arms 44, 45 and the tape guide support member 21 are stored in an overlapping state, and when tape loading is started, the movement of the loading arm 44 is as follows. The loading arm 45 is moved by being accelerated or decelerated by the two-stage gear 33 and the large gear 31 according to the tooth ratio of the two-stage gear 33, and the loading arm 45 is moved by the two-stage gear 32 and the large gear 31. , the movement of the loading arm 45 is accelerated or decelerated according to the tooth ratio of the two-stage gear 32, and the movement of the loading arm 45 is
As a result, the amount of movement of the loading arm 45 and the tape guide support member 21 can be arbitrarily determined by the ratio of the number of teeth of the two-stage gears 33 and 32. Further, the movement of the loading arm 44 is transmitted to the loading arm 43 via the pinion 34, and the movement of the loading arm 44 is transmitted to the loading arm 43 via the small gear 34.
6 and the tape guide support member 22 move in the same way as the loading arm 45 and the tape guide support member 21. Further, as the tape is loaded, the tape guide 30 and the inclined post 28 are moved to the fulcrum 56 to the positions 30a and 28a.
The pinch roller 18 and tape guides 42, 29 rotate around 18a, 42a, 29.
It is moved to position a and fixed (not shown).

In the above embodiment, four two-stage gears were used, but the number of two-stage gears can be arbitrarily selected in consideration of the loading amount, space factor, etc.

Effects of the Invention As described above, according to the present invention, each loading arm and tape guide support member can be stored in an overlapping manner during tape unloading. In addition, by arbitrarily setting the tooth ratio of the two-stage gear, it is possible to arbitrarily set the amount of advancement of the loading arm and the tape guide support member relative to the two-stage gear with which they are meshed. The length of the gear portion of the loading arm and the tape guide support member can be set to a length that makes the tape loading device most compact during tape unloading. Also
To realize a VTR in which a rotating head drum and a video cassette overlap easily without interference with a reel drive mechanism installed at the bottom of a video cassette. Furthermore, since everything is constructed using a gear drive system, there is little friction loss between each loading arm, allowing for smooth operation and making the device thinner.

[Brief explanation of drawings]

FIG. 1 is a schematic plan view of a conventional VTR tape loading device, FIG. 2 is a schematic plan view of a tape loading device according to an embodiment of the present invention in an unloading state, and FIG. 3 is a loading diagram of the same device. FIG. 4 is an enlarged perspective view of the main parts of the apparatus, FIG. 5 is an enlarged front view of the main parts of the apparatus, and FIG. 6 is an enlarged plan view of the main parts of the apparatus. 2...video cassette, 3...magnetic tape,
7, 11... Tape guide, 8, 10... Inclined post, 9... Rotating head drum, 21, 22...
Tape guide support member, 31, 37... large gear,
32, 33, 35, 36... 2-stage gear, 34...
Small gear.

Claims (1)

[Claims] 1. A tape guide that moves along a predetermined movement path to pull out the tape from the tape cassette and loads it in a helical manner onto the circumferential surface of the rotary head drum, and a large gear disposed on the substrate along the predetermined movement path. and a tape guide support member that supports the tape guide and has teeth, and two gears having different numbers of teeth that are coaxially fixed to each other, one gear meshing with the large gear and the other gear meshing with the large gear. is provided with a two-stage gear meshing with the teeth of the tape guide support member, and by rolling and rotating the two-stage gear along the large gear, the two-stage gear engages with the two-stage gear on the opposite side of the large gear. A tape loading device configured to move the tape guide support members in a meshed state in a direction in which the two-stage gear moves.