JPH048557Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a mechanical chassis for a novel recording/reproducing device. Specifically, regarding the mechanical chassis to which the various mechanisms and members that make up the recording/reproducing section are assembled, which is composed of two chassis sections, the main chassis section and the sub chassis section, we will discuss the efficiency of cutting out the sheet metal material that is the material of the mechanical chassis. A new recording and reproducing device that can significantly reduce the manufacturing man-hours and manufacturing costs of mechanical chassis, and can achieve surface accuracy between the main chassis section and the sub-chassis section with high precision. It aims to provide mechanical support.

BACKGROUND TECHNOLOGY AND PROBLEMS Recently, most recording and reproducing devices, such as video tape recorders (hereinafter referred to as ``VTR''), have adopted the so-called front loading method for mounting the tape cassette. I'm starting to do that. VCRs that use this front loading method have an opening for insertion.
Since it is not on top of the VTR, there are fewer restrictions on where to place the VTR, and the space above the VTR can be used effectively, but this creates what is called dead space inside the VTR. There are drawbacks.

FIG. 6 shows an example of a conventional VTR that employs the front loading method.

In the drawing, b is the outer casing of the VTR, and c is a mechanical chassis disposed at the lower part of the outer casing b. The mechanical chassis c is formed into a predetermined shape by pressing a single metal plate, and the reel stands d and d (only one is shown in the drawing) are placed on the upper surface of the mechanical chassis at positions near the front end. ), and a head drum e equipped with a rotating magnetic head for recording and reproducing is arranged at a position near the rear end of its upper surface.
Although not shown in the drawings, a large number of various mechanisms such as a tape feeding mechanism, tape loading mechanism, cassette loading and ink mechanism, and various members such as a head member are arranged on the upper surface of the mechanical chassis c.

Reference character f denotes an opening for inserting a cassette formed near the upper end of the front surface of the outer casing b, and a door (not shown) is attached thereto so as to be openable and closable.

Thus, the tape cassette g is attached to a predetermined position within the outer casing b through a moving path as shown by the solid arrow in the drawing. That is, when the tape cassette g is inserted into the outer casing b through the cassette insertion opening f, the tape cassette g is moved as shown by the solid line arrow by the cassette loading mechanism (not shown), and is moved as shown by the two-dot chain line. Come to the position shown.
When the tape cassette g reaches such a position, the cassette housing engages with a positioning pin (not shown) provided upright on the upper surface of the mechanical chassis c, thereby positioning the tape cassette in a predetermined position.
Tape reels h, h (only one is shown in the drawing) are engaged with engagement shafts i, i of reel stands d, d. A portion of the magnetic tape in the tape cassette g is pulled out from the casing by a tape loading mechanism (not shown), and the pulled out magnetic tape is displaced downward toward the winding start position of the head drum e. The tape is then moved upward from the end position of winding on the head drum e toward the tape cassette g.

In such a VTRa, the upper space within the outer casing b becomes a so-called dead space, which is completely useless except when attaching and detaching the tape cassette g. That is, when attaching and detaching the tape cassette g to and from the reel stands d and d using the front loading method, one end of the tape cassette g is attached to the reel stands d and d.
It must be brought to a position above the
There must be enough space above the reel stands d, d to allow the tape cassette g to move.

This kind of dead space was an extremely large obstacle in trying to downsize VTRs.

Therefore, in recent years, it has been possible to lower the position of reel stands d and d by improving the mechanical chassis of VTRs that adopt the front loading system, thereby making it possible to significantly reduce the height of the VTR. There is something I did. That is, as shown by the two-dot chain line in Fig. 6, the conventional mechanical chassis c
An opening j is formed in the part where the reel stand is arranged, another chassis, that is, a sub-chassis K is arranged below the opening j, and the reel stands l, (Only one side is shown.)
As a result, the position of the reel stand can be lowered significantly, and the tape cassette g can be attached to the reel stands l, l through the movement path shown by the two-dot chain arrow in the figure. . Therefore,
The upper surface of the outer casing b can be lowered to the position shown by the two-dot chain line, thereby making it possible to significantly reduce the height of the VTR.

By the way, with the reel stands l and l in this position, the magnetic tape pulled out from the tape cassette g is displaced upward toward the winding start position of the head drum e. The tape is displaced downward from the winding end position toward the tape cassette g.

However, if the mechanical chassis is constructed from two chassis members in this way, the number of man-hours and cost for manufacturing the mechanical chassis will increase, the efficiency of cutting the sheet metal material that is the material of the mechanical chassis will decrease, and There are problems such as difficulty in obtaining surface accuracy between the chassis with high precision.

In other words, this type of mechanical chassis generally has a large number of members, such as pin members, boss members that hold the pins, block members, etc., formed by so-called outsert molding. If the vehicle is constructed with two chassis, a main chassis and a sub chassis, at least two outsert molding steps described above are required. As for the work of assembling various parts to the mechanical chassis, first the parts are assembled on separate lines for the main chassis and sub chassis, and then the two chassis assembled in this way are integrated. It requires complex work. In other words, the number of man-hours required to manufacture the mechanical chassis will increase significantly.

Furthermore, if the mechanical chassis is made up of two chassis, an extra sheet metal material will be required for the sub chassis K, and the portion that will become the opening j described above will be punched out of the sheet metal material that will become the main chassis. The efficiency of board cutting becomes extremely poor.

Therefore, there is a problem in that the manufacturing cost of the mechanical chassis becomes extremely high.

If the mechanical chassis is composed of two chassis, it becomes extremely difficult to achieve surface accuracy between the two chassis with high precision. That is, in FIG. 6, m, m, . . . (only two are shown in the drawing) are substantially columnar connecting members that are outsert-molded on the main chassis, and the sub-chassis K is connected to these connecting members m, m. , . . . are fixed to the lower end faces of the components by screws n, n, . . . to be integrated with the main chassis. The main chassis and sub-chassis K, which have been integrated in this manner, need to be coupled so that the distance between their respective upper surfaces is maintained with high precision. This is because the various mechanisms and components that are assembled into the main chassis and sub-chassis K are delicately related to each other in their movements and positional relationships, so they must be assembled with high precision. This is because the surface accuracy between the chassis must be achieved with high accuracy. However, if the sub-chassis K is connected to the main chassis by the above-mentioned means, the surface accuracy between the two chassis may be slightly different due to slight differences in the tightening of screws n, n, etc. I'm going to go crazy.

As described above, conventional VTRs in which the mechanical chassis is composed of two chassis members, the main chassis and the sub-chassis, have various problems in manufacturing the mechanical chassis.

In addition, in view of the above-mentioned problems, it is also possible to form a mechanical chassis having the same shape as a mechanical chassis consisting of two chassis by drawing a single sheet metal material using a press. . However, with such a processing method, it is difficult to achieve the surface precision between the two chassis parts with high precision, and it is also difficult to put the mechanical chassis into a mold for outsert molding various parts. In this case, the so-called mold cannot be tightened at the bent portion, so it cannot be used practically.

Purpose of the invention Therefore, the present invention was made in view of the above-mentioned problems, and it is possible to improve the efficiency of cutting the sheet metal material that is the material of the mechanical chassis, and to reduce the manufacturing man-hours and manufacturing cost of the mechanical chassis. To provide a new mechanical chassis for a recording/reproducing device which can be significantly reduced in size and can achieve high surface accuracy between a main chassis part and a sub-chassis part.

Summary of the Invention In order to achieve the above-mentioned purpose, the mechanical chassis of the recording and reproducing apparatus of the present invention has a main chassis part on which a recording and reproducing head part is placed, and a main chassis part in which a tape cassette is mounted from the front. The present invention is characterized in that a sub-chassis part punched out from the main chassis part and a sub-chassis part on which a reel stand is arranged are integrated by outsert molding in a state where the sub-chassis part is translated downward by a predetermined distance from the punched position of the main chassis part.

Embodiments Below, details of the mechanical chassis of the recording and reproducing apparatus of the present invention will be explained according to embodiments shown in the accompanying drawings. In the embodiment shown in the drawings, the mechanical chassis of the recording/reproducing apparatus of the present invention is applied as a mechanical chassis of a VTR.

In the drawings, 1 is a mechanical chassis. The mechanical chassis 1 is made up of a main chassis section 2 and a sub chassis section 3 that are integrally connected.

The main chassis portion 2 is formed of a sheet metal material and has a substantially rectangular shape when viewed from above. The four sides of the main chassis section 2 are bent downward at approximately right angles, and the mounting pieces 4,
4 is integrally formed so as to protrude outward. 5 is an opening formed in a predetermined shape at a position near one end in the longitudinal direction of the main chassis 2, and as shown in FIG. It is formed by punching out the portion surrounded by the two-dot chain line 6 using a press or the like, as shown in FIG.

Incidentally, the portion punched out from the sheet metal 6 and translated downward in this way is used as the sub chassis 3 as it is. In addition, 7 (Figures 3 and 4)
(see figure) is an opening through which a drum shaft of a rotating side drum portion of a head drum, which will be described later, is inserted, and is formed when the sheet metal 6 is press-worked or when the sub-chassis 3 is punched out.

8, 8, . . . are resin-molded members such as pins, bosses, or blocks made of synthetic resin arranged at predetermined positions on the upper surface of the main chassis portion 2, and only a few of them are shown in the drawing. but,
In reality, a large number of various members are formed. It should be noted that some of these resin molded members 8, 8, . be.

9,9 (Only one is shown in the drawing.)
A boss is formed at a predetermined position on the sub-chassis 3, supports a reel shaft to be described later, and is made of synthetic resin.
Although not shown, the sub chassis 3
Various resin molded members other than the above-mentioned bosses 9, 9 are arranged.

10, 10, . . . are connecting members for connecting the main chassis portion 2 and the sub-chassis portion 3 to each other, and are formed of synthetic resin into a substantially columnar shape. The upper end portions of the connecting members 10, 10, . It is fixed by holding it in place.

Thus, the sub-chassis section 3 is disposed below the opening 5 of the main chassis section 2 in a state parallelly moved by a predetermined distance from the opening section 5, and is connected to the main chassis section 2 by the connecting members 10, 10, .
are integrally connected.

By the way, the above-mentioned resin molded members 8, 8, . 10, . . . are outsert molded as shown in FIG. That is,
In FIG. 5, 11 is a pair of molds 11a, 11
The mold 11 is a resin molding mold consisting of a mold 11 having a predetermined cavity formed therein. That is, 1
2, 12, ... (Only two are shown in the drawing.)
is a cavity for molding the resin molded members 8, 8, . The connecting members 10, 10, . . . (in the drawings) are used to connect the main chassis portion 2 and the sub chassis portion 3. (only two are shown). Note that 15, 15, . . . are spaces prepared for arranging the bent portions of the outer edge of the main chassis portion 2.

The main chassis section 2 and the sub chassis section 3 formed as described above are arranged at predetermined positions in the mold 11 thus formed, and the cavities 12, 12, . . . , 13, 13 and 14, 14, . . . , the above-mentioned predetermined resin molded members are formed integrally with the main chassis portion 2 and the sub-chassis portion 3. At the same time, the connecting members 10, 10, . . . are also formed integrally with the main chassis section 2 and the sub chassis section 3. That is,
All the resin molded members and connecting members necessary for each chassis section 2 and 3 are formed by one injection molding, and the connection between the main chassis section 2 and the sub-chassis section 3 is thereby achieved. become.

Thus, a mechanical chassis 1 is formed, which is composed of two chassis members, the main chassis section 2 and the sub chassis section 3.

In addition, the lower end of 16, 16 is the sub chassis 3.
The reel stand is rotatably supported by reel shafts 17, 17 (only one of which is shown in the drawing) that is press-fitted into bosses 9, 9 formed in the main shaft. Opening 5 of section 2
It is positioned above the upper surface of the main chassis section 2 to some extent. A head drum 18 is mounted at a predetermined position on the upper surface of the main chassis section 2, and is provided with a rotating magnetic head (not shown) for recording and reproducing.

Effects of the Invention As is clear from the above description, the mechanical chassis of the recording and reproducing apparatus of the present invention serves as the main chassis on which the recording and reproducing head is placed in a recording and reproducing apparatus into which a tape cassette is loaded from the front. A sub-chassis part punched out from the main chassis part and on which the reel stand is arranged is integrated by outsert molding with the sub-chassis part moved in parallel downward a predetermined distance from the punched position of the main chassis part. do.

Therefore, according to the present invention, a mechanical chassis consisting of two chassis sections, a main chassis section and a sub chassis section, can be manufactured at low cost and with fewer man-hours.
Moreover, it can be formed with high precision.

That is, by forming the sub-chassis section by punching it out from the main chassis section, there is no need for a special sheet metal material for forming the sub-chassis section, and the necessary openings can be formed in the main chassis section. Since the part punched out from this part can be used as it is as a sub-chassis part, the efficiency of cutting out the sheet metal material is extremely high.

Then, various resin molded members required for the main chassis section and the sub chassis section, respectively,
The connecting member for integrally connecting both chassis parts to each other can be formed by a single outsert molding process, and the outsert molding operation can also be used to connect the two chassis parts. It can also be used as a work. In other words, each chassis portion can be connected simultaneously through a single outsert molding process. Therefore, the number of man-hours required for manufacturing the mechanical chassis is significantly reduced.

Further, since the main chassis section and the sub chassis section are connected by outsert molding using a mold, the two chassis sections can be connected to each other in a precisely positioned state. Therefore, the surface accuracy between the two chassis parts constituting a single mechanical chassis can be achieved with extremely high precision.

Since the mechanical chassis is now manufactured as a single member, the work of assembling various parts to the mechanical chassis can be done consistently on one assembly line.

Therefore, according to the present invention, it is possible to improve the efficiency of cutting the sheet metal material that is the material of the mechanical chassis, and it is also possible to significantly reduce the manufacturing man-hours and manufacturing cost of the mechanical chassis, and the main chassis part and the sub chassis part It is possible to provide a mechanical chassis for a novel recording/reproducing device that can achieve surface precision between the two with high precision.

[Brief explanation of the drawing]

1 to 5 show an example of an embodiment in which the mechanical chassis of the recording/reproducing apparatus of the present invention is applied as a mechanical chassis of a video tape recorder.
Figure 1 is a plan view of the mechanical chassis, Figure 2 is a sectional view taken along the - line in Figure 1, and Figures 3 to 5 show the manufacturing process of the mechanical chassis in order from Figure 3 to Figure 5. Figure 3 is a perspective view of the sheet metal that will become the main chassis part, Figure 4 is a perspective view showing the sub-chassis part being punched out from the sheet metal part that will become the main chassis part, and Figure 5 is a perspective view of the main chassis part and the sub-chassis part being made of metal. FIG. 6 is a longitudinal cross-sectional view showing a state in which the device is integrally outsert-molded using a mold, and FIG. 6 is a schematic side view showing an example of a mechanical chassis of a conventional recording/reproducing device. Explanation of symbols, 1...Mechanical chassis, 2...Main chassis section, 3...Sub chassis section, 16...
Reel stand, 18...head section.

Claims (1)

[Scope of Claim for Utility Model Registration] A recording/reproducing device into which a tape cassette is loaded from the front, comprising a main chassis section on which a recording/reproducing head section is placed, and a sub-chassis section punched out from the main chassis section and on which a reel stand is placed. A mechanical chassis for a recording/reproducing device, characterized in that the sub-chassis section is integrated by outsert molding in a state where the sub-chassis section is translated downward a predetermined distance from the punched position of the main chassis section.