JPS6323836Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head housing assembly in a magnetic tape recording and/or reproducing device.

The head housing of a reel-to-reel tape deck is desirably constructed so that a portion thereof can be opened and closed in order to facilitate adjustment and cleaning of the magnetic head. However, in conventional head housings that can be opened and closed, the shaft that serves as the fulcrum for opening and closing, the arm that supports this shaft, the spring for opening and closing, the cam mechanism for maintaining the head in the closed and open positions, etc. are separate from the head housing. Since the structure was such that it was formed into a head housing and attached to the head housing with screws, etc., it was not only troublesome to assemble, but also inevitably resulted in a high price.

Therefore, the purpose of this invention is to provide easy assembly.
It is an object of the present invention to provide a magnetic head housing assembly that can reduce costs and is more convenient to use.

To achieve the above object, the present invention will be described with reference to the reference numerals in the drawings. The present invention includes a first head housing part 1 made of synthetic resin and a second head housing part 2 made of synthetic resin. The second head housing part 2 has an integrally formed shaft 7,8, and the first head housing part 1 has an integrally formed shaft engaging the shaft 7,8. the second head housing part 2 is rotatably engaged with the first head housing part 1 about the shafts 7, 8; The head housing part 2 has cams 15, 16 which are coaxially arranged and integrally formed with the shafts 7, 8,
The first head housing part 1 has integrally formed cam-engaging spring arms 13, 14, and the cam-engaging spring arms 13, 14 have cam-engaging protrusions near their tips that engage with the cams 15, 16. Part 1
7, and the cams 15, 16 have a closed position holding cam surface 19 for keeping the second head housing part 2 in the closed position with respect to the first head housing part 1, and Housing parts 2
at least one of an open position holding cam surface 20 for keeping the head housing in the open position and an intermediate position holding cam surface 21 for keeping the second head housing part 2 at an intermediate position between the closed position and the open position. The present invention relates to a magnetic head housing assembly characterized in that it has two parts.

The above device has the following effects.

(a) Cams 15, 16 and cam engagement spring arm 1
3 and 14, the second head housing part 2 can be stably maintained at a specific position.

(b) A bearing part and a cam engaging spring arm 1 are attached to the first head housing parts 1 and 2 made of synthetic resin.
3, 14 are integrally formed, and the shafts 7, 8 and cams 15, 16 are integrally formed in the second head housing part 2 made of synthetic resin.
Although the second head housing part 2 is configured to be rotatable, it can be easily assembled with a small number of parts.

Next, embodiments of the present invention will be described with reference to the drawings.

1 to 9 show a head housing assembly for a reel-to-reel tape deck.
As is clear from the exploded perspective view of FIG. 1 and the plan view of FIG.
This is an assembly of a first head housing part 1 and a second head housing part 2 made of ABS resin, and the first head housing part 1 is the fixed side.
The second head housing part 2 is configured to rotate with respect to the second head housing part 2. This head housing assembly houses, for example, a magnetic head 3 that comes into sliding contact with a magnetic tape 3, as shown in FIG.
Although it is closed as shown in the figure, it is opened when cleaning the magnetic head 4 or the like.

The opening and closing mechanisms for the first and second head housing parts 1 and 2 are not constructed separately, but are integrally formed on the first and second head housing parts 1 and 2 during resin molding. That is, as is clear from FIG.
It is integrated into the head housing part 2 of the head housing part 2.
The pair of bearing parts 5 and 6 each have a positioning part 9 for determining the engagement position of the shafts 7 and 8, and each have a holding arm 10 having spring properties. As is clear from FIG. 3, the holding arm 10 has an inclined surface 11 on the outside of its tip and a hook portion 12 on the inside of its tip. The entrance of the shaft accommodating portion surrounded by the housing substrate 1a, the positioning portion 9 protruding from the housing substrate 1a, and the holding arm 10 extending parallel to the substrate 1a is formed narrower than the diameter of the shaft 7; When axis 7 is moved as shown by the arrow, axis 7
presses against the inclined surface 11, the holding arm 10 is deformed with spring properties as shown in FIG. 4, and the shaft 7 passes through the entrance and reaches the positioning portion 9. After the shaft 7 has passed through the entrance, the holding arm 10 returns to the position shown in FIG. 5, and the lock portion 12 prevents the shaft 7 from being removed. Now, the relationship between one shaft 7 and the bearing part 5 has been described, but the other shaft 8 and the bearing part 6
They are structured in exactly the same relationship.

A pair of cam-engaging spring arms 13 and 14 are also integrated into the first head housing part 1, and a pair of cams 1 are integrated into the second head housing part 2.
5 and 16 are integrated. The pair of spring arms 13 and 14 extend parallel to the substrate 1a, and each has a semicircular engagement protrusion 17 at its tip. A friction member 18 is attached to the protrusion 17 to increase friction. This friction member 18 is formed of a stainless steel plate having spring properties, and is fitted onto the protrusion 17 using its spring properties.

As shown in FIGS. 7 to 9, the cam 15 has a cam surface 19 for holding the closed position and a cam surface 20 for holding the open position.
and an intermediate position holding cam surface 21. Fifth
As shown in the figure, the first and second head housing parts 1 and 2 are completely assembled and the second
When the head housing part 2 is closed, the relationship between the spring arm 13 and the cam 15 is as follows.
The state shown in the figure will be reached. That is, the cam surface 1 for holding the closed position
9 presses the spring arm 13 to cause it to warp. As a result, the springiness of the arm 12 acts on the cam 15 as a drag force, and the force F ₁ applies a rotational moment about the shaft 7 to the second head housing part 2 . Spring biased in the closing direction.

As shown in FIG. 8, when the second head housing part 2 is rotated clockwise in FIG. 8, the intermediate position holding cam surface 21 presses the arm 13, and the warpage of the arm 13 becomes maximum. In the state shown in FIG. 8, the spring drag force exerted by the arm 13 is directed toward the shaft 7 as shown by the arrow, so the rotational moment becomes substantially zero, and even if the second head housing part 2 is released, it remains in this position. dripping

As shown in FIGS. 6 and 9, when the second head housing part 2 is moved to the maximum open position, the arm 13 engages with the open position holding cam surface 19, producing a drag force as shown by the arrow. F ₂ applies a rotational moment about the shaft 7 to the head housing part 2 shown in FIG. 2, and the second head housing part 2
is in a state where it is spring biased clockwise as shown in Figure 9,
The second head housing part 2 remains in this position even if the hand is removed. Although one spring arm 13 and cam 15 have been described above, the other spring arms 14 and 16 are similarly constructed.

In Fig. 1, 23 is a hole used to fix the first head housing part 1 to the tape deck body, 24 is a stopper that determines the closed position, and 25 is a stopper surface that determines the open position. .
Incidentally, a surface 26 having an angular interval of 90 degrees with respect to the stopper surface 25 functions as a stopper in the closed position.

The head housing of this embodiment has the following advantages.

(a) First and second head housing parts 1 and 2
Assembling is completed by simply connecting the two as shown in FIGS. 3 and 4, making assembly extremely easy. That is, since the shaft, bearing parts, cam mechanism, etc. are integrated into the housing parts 1 and 2, it is not necessary to form and attach them independently, and assembly becomes easy.

(b) Shafts 7, 8, bearing parts 5, 6, spring arm 1
Since the components 3, 14, cams 15, 16, etc. are integrated into the housing by resin molding, it is possible to significantly reduce the number of parts and reduce costs.

(c) Since each part is formed by integral molding with a mold, the positional relationship of each part is accurate.

(d) Since the holding arm 10 has spring properties and is deformed, the shafts 7 and 8 are attached to predetermined positions, so that the pair of housing parts 1 and 2 can be easily engaged. can do.

(e) Since the holding arm 10 is provided with the hook portion 12, the shafts 7 and 8 will not easily come off.

(f) Since the holding arm 10 has spring properties and is deformable, it is possible to disengage the first and second head housing parts 1 and 2 as necessary.

(G) By attaching the friction member 18 to the tips of the arms 13 and 14, the contact resistance with the cams 15 and 16 is increased, and the flapping when the second head housing part 2 is opened and closed is reduced.

Although the embodiments of the present invention have been described above, the present invention is not limited thereto and can be further modified. For example, the present invention can also be applied to a case where the second head housing part 2 is fixed to the tape deck body and the first head housing part 1 is used as the opening/closing side. Further, the cams 15 and 16 are provided on the side of the first head housing part 1, and the arms 13 and
14 can also be provided on the side of the second head housing part 2. Further, instead of providing the hook portion 12 on the holding arm 10, a hook-shaped protrusion may be provided on the base plate 1a to prevent the shafts 7, 8 from coming off.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing a head housing according to an embodiment of the present invention, Fig. 2 is a plan view of the head housing assembly, and Figs. 3, 4, and 5 are shown along the - line in Fig. 2. 6 is a sectional view showing the assembled state when viewed from corresponding parts; FIG. 6 is a sectional view showing the second head housing part in an open state; FIGS.
9 and 9 are side views showing the engagement relationship between the cam and the arm. In the symbols used in the drawings, 1 is the first head housing part, 2 is the second head housing part, 5 and 6 are the bearing parts, 7 and 8 are the shafts,
9 is a positioning part, 10 is a holding arm, 13,1
4 is a cam engagement spring arm, and 15 and 16 are cams.

Claims (1)

[Claims for Utility Model Registration] An assembly of a first head housing part 1 made of synthetic resin and a second head housing part 2 made of synthetic resin, wherein the second head The housing part 2 has an integrally formed shaft 7, 8, the first head housing part 1 has an integrally formed bearing part that engages the shaft 7, 8, and the second head housing The part 2 is rotatably engaged with the first head housing part 1 about the shafts 7, 8, and the second head housing part 2 is coaxial with the shafts 7, 8. cams 15, 16 integrally arranged and integrally formed; said first head housing part 1 has integrally formed cam-engaging spring arms 13, 14; said cam-engaging spring arms 13, 14; has a cam engaging protrusion 17 near its tip that engages with the cams 15 and 16; Closed position holding cam surface 19 that maintains the closed position
, an open position holding cam surface 20 for keeping the second head housing part 2 in the open position, and an intermediate position for keeping the second head housing part 2 in an intermediate position between the closed position and the open position. A magnetic head housing assembly comprising at least one retaining cam surface.