JPH0448466A - Tape loading mechanism of magnetic recording/playback device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention relates to a tape loading mechanism for a magnetic recording and reproducing device, and in particular, the present invention relates to a tape loading mechanism for a magnetic recording and reproducing device. The present invention relates to a tape loading mechanism of a magnetic recording/reproducing device that winds a magnetic tape around a drum that supports a head.

[Prior Art] In the conventional structure of the tape loading mechanism of this type of magnetic recording/reproducing device, specifically, a VTR, the two ring members called loading rings are connected to the chassis that supports the entire mechanism of the VTR. It was designed to be assembled in a rotatable manner.

[Problems to be Solved by the Invention] However, with the recent progress in miniaturization of VTRs, it has become difficult to assemble the ring member in the above ring member assembly structure. SUMMARY OF THE INVENTION An object of the present invention is to provide a tape loading mechanism for a magnetic recording/reproducing apparatus of this type, in which components including the ring member can be simply and easily assembled.

[Means for Solving the Problems] In order to solve the above problems, the present invention provides a drum that supports a magnetic tape by rotating two ring members coupled with guide posts that guide a magnetic tape. A tape loading mechanism of a magnetic recording and reproducing apparatus for winding a magnetic tape around a magnetic recording and reproducing apparatus has a drum base that supports the drum and is fixed to the chassis of the magnetic recording and reproducing apparatus, and the two ring members are attached to the drum base. The structure is such that it can be rotated.

[Action 1 According to such a structure 411!4, the drum base has 2
By attaching two ring members to form a unit, the components of the loading mechanism including the drum base and the ring member can be simply and easily assembled to the magnetic recording/reproducing device.

[Example] Hereinafter, details of embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view illustrating the structure of a loading unit that constitutes a tape loading mechanism of a VTR according to an embodiment of the present invention. First, each component of the loading unit shown in the figure and its assembly will be explained.

Reference numeral 1 denotes a drum base, which supports a drum that supports a rotating magnetic head (not shown). Positioning members 1a and 1b for positioning the guide post 2.3 are integrally formed on the drum base l.

The guide posts 2.3 and 7 are for contacting and guiding a magnetic tape (not shown), respectively. The guide post 2 is connected to the first loading ring (hereinafter referred to as
(abbreviated as ring) 4. The guide posts 3.7 are movably connected to the axis 17.20 of the second ring 5 via respective arms 16.19. axis 1
7.20 is provided so as to be slidable in the circumferential direction of the ring 5, and is biased counterclockwise by a spring 18.

The ring 4.5 rotates to move the guide post 2.3.7, and has gear teeth formed on its outer periphery to transmit one rotational force. The rings 4.5 are attached via rollers 11 to three or more shafts 12 protruding from the lower side of the drum base l, and are parallel to each other and directly facing each other.
The drum is rotatably mounted around the center of the drum base l. Note that the ring 5 has a larger outer diameter than the ring 4, and the rotation angle during loading, which will be described later, is also larger.

Next, reference numeral 6 is a gear plate for transmitting rotational force between the rings 4 and 5, and two gears 8 and 9 for this purpose.
It supports a gear train consisting of. The gear plate 6 is attached to the underside of the guide post l from below the ring 4.5. In this case, the gear 8 is meshed with the teeth on the outer circumference of the ring 5, the gear 9 is meshed with the teeth of the ring 4, and the gear 8.
The gear plate 6 is rotatably provided around the center of rotation of the ring 4.5 so that the gear plate 9 is movable in the vertical direction along the outer periphery of the ring 4.5. Also, the gear plate is biased clockwise by a spring 10.

Note that when attaching the gear plate 6 to the drum base 1 from below the ring 4.5, a predetermined portion on the outer periphery of the ring 5 is provided so that the gear 9 meshed with the upper ring 4 does not hit the lower ring 5. A notch 5c is formed to avoid the gear 9, and the gear 9 is engaged with the upper ring 4 at this portion.

Next, reference numerals 13 and 14 denote guide rails in which guide grooves 13a and 14a are formed for guiding the guide posts 2.3, respectively, and are fixed to the lower side of the drum base l.

Further, a drum (not shown) is fixed to the drum base 1 with mounting screws. The aforementioned screws are inserted into screw holes (not shown) formed in the drum base 1 at a portion directly facing the plate portion of the ring 4.5. Therefore, ring 4
．． In order to tighten or remove the screws for attaching and detaching the drum to and from the drum base 1 through 5,
Holes 4a, 4b, 5a for passing the screws through a portion of the ring 4.5 that directly faces the screw hole at a predetermined rotational phase, and a corresponding portion of the plate 6.

5b and 6a are formed (.

A loading unit is constructed by assembling each of the above constituent members. The top and bottom sides of the assembled loading unit are shown in FIGS. 2 and 3. Third
In the figure, numerals 21 to 23 are the above-mentioned drum mounting screws, and screws 21 and 22 are the above-mentioned holes 4a, 5a, and 6.
Tightening and removal are performed through a, 4b, and 5b. The loading unit is assembled by fixing the drum base l with screws to a chassis (not shown) that supports the entire mechanism of the VTR.

Next, the loading operation by the loading unit will be explained.

During loading, first, the lower ring 5 is rotated counterclockwise as indicated by arrow a in FIG. 1 by driving a loading motor (not shown). This rotational force is transmitted to the upper ring 4 by the gears 8 and 9, and the ring 4 rotates clockwise as shown by the arrow. In conjunction with the rotation of the ring 4.5, the guide post 2.3 moves from the first position at the front end in FIG. 2 to the guide rail 13.1 as shown by arrows c and d.
4 to the second position at the rear end along the guide grooves 13a and 14a of No. 4, and move the magnetic tube (not shown) to wind it around a drum (not shown).

The guide post 2.3 that has moved to the second position engages with the positioning members 1a, Lb and is positioned. When the ring 5 is further rotated counterclockwise, the guide post 3 cannot move, so the spring 18 is stretched, and its elastic force presses the guide post 3 against the positioning member 1b and holds it immovably. Also, since the guide post 2 cannot move, the rotation of the ring 4 is prevented, and the gear 8.9 rotates due to the rotational force of the ring 5, rotating (revolving) counterclockwise with respect to the ring 4.5, and the spring 10 Stretched out. The ring 4 is biased clockwise by the elastic force of the spring IO, and the guide post 2 is pressed against the positioning member 1a and held immovably.

Loading is completed in this way. Note that unloading is performed by the reverse operation to the above.

According to the loading unit of this embodiment as described above, members such as the rings 4 and 5 are attached to the drum base 1 to form a unit, so that it is easy to assemble the constituent members of the unit including the rings 4 and 5 to the VTR. This can be done all at once in units, which is extremely simple and easy compared to the conventional method of assembling individual components to the chassis separately. Therefore, the ease of assembling the VTR can be significantly improved, and it can also contribute to miniaturization. In addition, each member can be managed in a rational manner in units of units.

[Effects of the Invention 1] As is clear from the above description, according to the present invention, by rotating two ring members connected to guide posts that guide the magnetic tape, the magnetic tape is moved against the drum that supports the magnetic head. A tape loading mechanism for a magnetic recording and reproducing device in which a magnetic recording and reproducing device is wound around the drum, the tape loading mechanism having a drum base that supports the drum and is fixed to a chassis of the magnetic recording and reproducing device, and the two ring members are rotatable with respect to the drum base. The attached structure was adopted. According to this structure, the components of the loading mechanism including the drum base and the ring member can be simply and easily assembled to the magnetic recording/reproducing device, and the assemblability of the magnetic recording/reproducing device can be significantly improved. Excellent effects such as contributing to miniaturization can be obtained.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing the structure of a tape loading unit of a VTR according to an embodiment of the present invention, and FIGS.
The figures are a top view and a bottom view of the same unit in an assembled state, respectively. - Drum base 2.3.7 Guide post 4.5 Loading ring 6 Gear plate 8.9 Gear 10. 13. 18... Spring 14... Exploded perspective view of the guide rail loading unit Fig. 1 Top view of the loading unit Fig. 2

Claims (1)

[Scope of Claims] 1) In a tape loading mechanism of a magnetic recording/reproducing device in which a magnetic tape is wound around a drum supporting a magnetic head by rotating two ring members coupled with a guide post that guides the magnetic tape. , A tape loading device for a magnetic recording and reproducing device, comprising a drum base that supports the drum and is fixed to a chassis of the magnetic recording and reproducing device, and the two ring members are rotatably attached to the drum base. mechanism. 2) The tape loading mechanism for a magnetic recording and reproducing apparatus according to claim 1, further comprising a gear train attached to the drum base for transmitting rotational force between the two ring members. 3) The gear train is provided rotatably in two directions along the outer periphery of the ring member, and is biased in one of the two directions by an elastic member.
A tape loading mechanism of a magnetic recording/reproducing device according to item 1 or 2. 4) A fixing member for fixing the drum to the drum base through the holes, the two ring members being disposed so as to face each other in parallel, and having holes formed in portions of the two ring members that face each other at a predetermined rotational phase. Any one of claims 1 to 3, characterized in that the device is adapted to be attached and detached.
The tape loading mechanism of the magnetic recording and reproducing device described in 2. 5) The two ring members are arranged to face each other in parallel, and a notch is formed at a predetermined portion on the outer periphery of one ring member to avoid a predetermined gear in the gear train when the gear train is attached. 5. The tape loading mechanism of a magnetic recording/reproducing apparatus according to claim 1, wherein the tape loading mechanism is characterized in that: