JP2570640B2 - Tape guide device for magnetic recording / reproducing device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a tape guide device of a magnetic recording / reproducing apparatus such as a VTR.

[0002]

2. Description of the Related Art FIG. 6 is a plan view showing a conventional magnetic recording / reproducing apparatus.
The magnetic tape 3 accommodated in the drum 3 has a rotating magnetic head (not shown) mounted thereon, and the magnetic tape 2 has a drum 3
The guide base 5 is moved between a non-withdrawal position in the cassette 1 and a withdrawal position forming a predetermined magnetic tape 2 traveling path so as to be wound around the magnetic tape 2. The guide pole 6 guides the movement of the guide base 3, and is a metal guide member made of die cast or the like for guiding the movement of the guide base 3.

FIG. 7 is a vertical sectional side view showing the tape guide device of FIG. 6. In FIG. 7, reference numeral 7 is provided on at least one of an upper portion and a lower portion of the guide pole 5 to regulate the running height of the magnetic tape 2. The flange 8 has a guide pole shaft that engages with the hole 4a of the guide base 4 so that the guide pole 5 can be easily moved in the axial direction and the rotation direction.
Reference numeral 9 denotes a screw portion which is fixed to the shaft 8 and engages with the screw hole 4b of the guide base 4 so that the height of the guide pole 5 can be adjusted by rotating the shaft 8. Reference numeral 10 denotes a height of the guide pole 5. A set screw that presses and tightens the shaft 8 from the side of the guide base 4 to fix the guide base 4 after adjustment.
Reference numeral 11 denotes a retaining member for preventing the guide base 4 from dropping off the guide member 6 when moving.
As shown in JP-A-37-935, the guide base 4 of the guide member 6 is fixed to the lower portion of the guide base 4 with screws 12 so as to be able to slide on the surface 6b opposite to the surface 6a on which the guide base 4 slides.

Next, the operation will be described. The magnetic tape 2 housed in the cassette 1 is guided by a guide member 6 and is guided by a guide pole 4 locked from a non-withdrawal position in the cassette 1 to a withdrawal position forming a predetermined traveling path. 5, it is pulled out of the cassette 1 and wound obliquely at a predetermined angle with respect to the drum 3.
The height of the guide pole 5 is adjusted by the screw portion 9 at the pull-out position so that the signal is properly transmitted between the magnetic tape 2 and the drum 3.
Is regulated so that the magnetic tape 2 runs at a predetermined height. After the above height adjustment, the guide pole 5 is fixed to the guide base 4 by tightening the set screw 10.

Further, as a method of fixing the guide pole 5, a structure disclosed in Japanese Patent Application Laid-Open No. 1-125755 has been considered. That is, as shown in FIG. 8, a screw portion 9 is press-fitted and fixed to the shaft 8 of the guide pole 5, and the screw portion 9 is fixed.
Is obtained by baking a resin 13 on the outer periphery of the resin. In the device configured as described above, the frictional resistance of the screw portion 9 is increased by the resin 13, so that the guide pole 5 can be prevented from loosening without using the set screw 10 as shown in FIG.

[0006]

The tape guide device of the conventional magnetic recording / reproducing apparatus is constructed as described above. Therefore, in the case shown in FIG. Since tapping is required from the side of the base 4, there is a problem that the processing steps are complicated and the manufacturing cost is increased. In addition, in the case shown in FIG. 8 where the frictional force of the resin 13 baked on the screw portion 9 is used. In this case, it is difficult to control the thickness of the resin 13, so that it is difficult to screw the guide pole 5 into the guide base 4, and the variation in the screwing torque becomes large.
There has been a problem that reliability is deteriorated.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a tape guide device of a magnetic recording / reproducing apparatus which has high productivity, low manufacturing cost and high reliability. Aim.

[0008]

Means for Solving the Problems] tape guide device of a magnetic recording and reproducing apparatus according to the present invention, that having a smaller diameter hole than the axis of the guide pole counter-guide pole side of the guide base
Those with a bush made of an elastic body tree butter, and the like.

[0009]

According to the present invention, the guide pole is
Screw the guide pole into the guide pole.
Squeezes into the small diameter hole of the
Since more guide pole is positioned and fixed, Ru can lock the guide pole to the guide base by a frictional force between the bush without using the set screw or the like.

[0010]

1 and 2 show an embodiment of the present invention.
Will be described. FIG. 1 is a longitudinal sectional side view, and FIG. 2 is a partial view showing a middle portion of a guide pole being screwed. The same or corresponding parts as those of the above-mentioned conventional one are denoted by the same reference numerals and description thereof is omitted.

In FIG. 1, a bush 14 is fixed to the guide base 4 on the side opposite to the guide pole 4c by press-fitting or the like, and is made of an elastic material such as polyacetal resin. 14a is a bush 14 and a guide pole 5 shaft 8.
A hole having a diameter smaller than the outer diameter of the shaft 8 provided to hold the bush 14 in a squeezed fit state in which the insertion force of the shaft 8 is smaller than the withdrawal force of the bush 14 from the hole 4d of the guide base 4, and 14b is a guide. It is a flange-shaped stopper provided on the bush 14 so that the guide base 4 of the member 6 can slide on the surface 6b opposite to the surface 6a on which the guide base 4 slides.

When the guide pole 5 is inserted into the guide base 4, as shown in FIG. 2, the screw portion 9 guides the shaft 8 before the tip of the shaft 8 reaches the hole 14 a of the bush 14 fixed in advance to the guide base 4. The guide pole 5 can be easily screwed into the guide base 4 by being configured to engage with the screw hole 4b of the base 4, and the resin 13 is baked on the screw portion 9 as shown in FIG. As described above, there is no problem that the guide pole 5 is difficult to be screwed.

Further, when the guide pole 5 is further screwed into the screw hole 4b of the guide base 4, the shaft 8 is engaged with the hole 14a in a squeezed state, and is larger than the frictional force between the shaft 8 and the hole 14a. The height of the guide pole 5 is adjusted by rotating the guide pole 5 with a torque, and after the adjustment, the guide pole 5 is locked to the guide base 4 by the frictional force. For this reason, the conventional set screw 10 is unnecessary, and tapping from the side of the guide base 4 is not required, so that the manufacturing cost can be reduced. Further, since the hole 14a can be formed with high dimensional accuracy and small variation by injection molding or the like, the variation in the frictional force is small and a highly reliable one can be obtained. Then, there is no problem that the guide pole 5 is inclined by tightening the set screw 10 from the side. Since the bush 14 is integrally formed with the flange-shaped stopper 14b, there is no need to provide a separate stopper member 11 as in the conventional case shown in FIG. 7, and the manufacturing cost can be reduced.

In the above embodiment, the bush 14 is provided with the flange-shaped stopper 14b. However, the stopper 14b may have a disk shape, a square shape, an irregular shape, or the like. It can be easily manufactured. In addition, the stopper 14b does not need to be provided on the entire circumference of the bush 14, but may be provided on at least a part thereof.

Next, another embodiment of the present invention will be described with reference to FIGS. FIG. 3 is a plan view showing a guide base, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. In the figure, reference numeral 15 denotes a stopper provided on the opposite side 4c of the guide pole engaging portion 4A of the guide base 4 so as to slide on the surface 6b of the guide member 6 opposite to the surface 6a on which the guide base 4 slides. It is provided in. The stopper 15, the guide base 4, and the guide pole engaging portion 4A are integrally formed of PPS resin by an injection molding method.

A stopper 15 integrally formed on the guide base 4 so as to slide on the surface 6b opposite to the surface 6a on which the guide base 4 slides on the guide member 4 is not guided by the guide base 4 by the guide member 6. The guide base 4 is prevented from dropping off the guide member 6 when moving between the pull-out positions. For this reason, it is not necessary to provide a separate retaining member 11 unlike the conventional case shown in FIG. 7, and the number of parts is reduced, and the manufacturing cost is reduced. Further, since the guide base 4 and the stopper 15 are integrally formed of resin, the guide base 4 formed by cutting a die-cast member made of a metal such as aluminum or zinc as in the related art.
The weight and the manufacturing cost are significantly reduced as compared with the case where the individual retaining members 11 are locked.

In the above embodiment, the stopper 15 and the guide base 4 are integrally formed of PPS resin. However, the type of resin is not limited to this.
Other resins may be used.

In the above embodiment, the stopper 15 is provided on the guide pole locking portion 4A of the guide base 4. However, the position where the stopper 15 is provided is not limited to this. For example, FIG. May be formed integrally with the guide base 4 so that the guide base 4 of the guide member 6 slides on the surface 6b opposite to the surface 6a on which the guide base 4 slides.

Further, the stopper 15 may be provided in at least one place, and a plurality of stoppers 15 may be provided. Any of them can be easily formed integrally by means such as injection molding. Further, the guide base, 4 and the stopper 15 may be integrally formed, and the manufacturing method is not limited to the injection molding method using the resin shown in the above-described embodiment, but may be a die casting method,
The metal may be integrally formed by a sintering method or the like.

[0020]

As described above, according to the present invention, there is an effect that a product having good productivity, low manufacturing cost and high reliability can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing an embodiment of the present invention.

FIG. 2 is a partial view showing the guide pole shown in FIG.

FIG. 3 is a plan view showing another embodiment of the present invention.

FIG. 4 is a sectional view taken along line IV-IV in FIG. 3;

FIG. 5 is a partial sectional view showing still another embodiment of the present invention.

FIG. 6 is a plan view showing a conventional magnetic recording / reproducing apparatus.

7 is a vertical sectional side view showing the tape guide device of FIG. 6;

FIG. 8 is a partial view showing a different conventional device.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Cassette 2 Magnetic tape 3 Drum 4 Guide base 5 Guide pole 6 Guide member 8 Guide pole shaft 14 Bush 14a Bush hole 14b Bush stopper 15 Guide base stopper

Claims (1)

(57) [Claims] A magnetic tape is pulled out of a cassette and is wound obliquely at a predetermined angle on a drum on which a rotating magnetic head is mounted. A non-drawing position in the cassette and a drawing position forming a running path of the magnetic tape. A guide base that moves between the guide bases, a guide pole that is locked to the guide base so as to be adjustable in height, and guides the running of the magnetic tape, and a guide member that guides the movement of the guide base. in the tape guide device comprising a bushing made of an elastic body tree butter, and the like that have a smaller diameter hole than the axis of the guide pole counter-guide pole side of the guide base, Yuku by screwing the guide pole guide base When
In addition, the tip of the shaft of the guide pole is
It is engaged with the hole in a squeezed fit
A tape guide device for a magnetic recording / reproducing device, wherein a depole is positioned and fixed .