JPH02232851A - Tape guide device - Google Patents

Abstract

PURPOSE:To improve the traveling of a tape by providing an adjusting means for adjusting the height of a tape guiding body on a supporting shaft and attaching an ultrasonic vibrator for causing standing wave vibration in a tape guiding body. CONSTITUTION:The adjusting means for adjusting the heights of the tape guiding body 13 and a pair of upper and lower flanges 14 and 15 which regulate the movement of the magnetic tape 4 in a width direction is constituted of a leaf spring 16 and a flange presser 17. Moreover, the approximate center part of the tape guiding body 13 is directly excited by means of the laminated ultrasonic vibrator 18 attached in the longitudinal direction of the guiding body 13, so that the standing wave vibration is caused in the guiding body 13, which is resonated with the magnetic tape in the radial direction of the guiding body 13. Thus, the resonance frequency of the guiding body 13 is made higher than that of precedent technique by the vibrator 18. Therefore, the adhering force between the magnetic tape and the guiding body 13 is made small and the traveling of the tape is more stabilized.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention provides a tape guide that reduces the coefficient of friction of a tape guided by a tape guide body and that facilitates height adjustment of the tape guide body. Regarding equipment.

[Summary of the Invention] The present invention provides a tape guide device that reduces the coefficient of friction between the tape guided by the tape guide body and the tape guide body by directly applying ultrasonic vibration to the tape guide body. A cylindrical tape guide body for guiding the tape is fitted onto a support shaft erected on a base through at least a pair of support members, and the height of the tape guide body is adjusted to the support shaft. At the same time, an ultrasonic vibrator that generates standing wave vibration is attached to the tape guide body, thereby generating standing wave vibration in the tape guide body and increasing the coefficient of friction of the tape as much as possible. The tape guide body can be made smaller to further improve tape running performance, and the height of the tape guide body can be easily adjusted.

[Prior Art] The present applicant has developed a video tape recorder (VTR) in which the coefficient of friction of the magnetic tape guided by a tape guide is reduced.
) for a tape guide device with flanges, patent application 1983-
It was disclosed in No. 185242. To explain this in detail with reference to FIGS. 9 to 11, reference numeral 100 denotes a flanged sliding tape disposed on the exit and entrance sides of the rotating hemed drum 9l of the open-reel type video table recorder 90 shown in FIG. 11. It is a guide device.

This tape guide device 100, as shown in FIG.
A cylindrical tape guide 101 that guides the magnetic tape 92 in the tape running direction, a holder 102 that vertically attaches and fixes the tape guide 101 on the tip 102a,
A laminated ultrasonic transducer 103 is attached to a notch 102b formed in a U-shape in the middle of this holder 102 so as to be parallel to the longitudinal direction of the holder 102.
It is roughly composed of.

Furthermore, a generally disc-shaped upper flange 104 is fixed to the upper end of the tape guide lot to restrict movement of the magnetic tape 92 in the width direction (upward direction) when the tape is running. moreover,
The tip of the holder 102 above! 02a is a lower flange that restricts the downward movement of the magnetic tape 92. As shown in FIG. By vibrating in this direction, the coefficient of friction (so-called adhesive force) of the magnetic tape 92 with respect to the tape guide 101 is reduced, thereby improving the stability of tape running in the tape running system. Further, vertical movement of the magnetic tape 92 during tape running is restricted by an upper flange 104 and a tip portion 102a serving as a lower flange of the hole f-102.

[Problems to be Solved by the Invention] However, the tape guide device 100 of the above-mentioned prior art
Since the tape guide IQI is indirectly vibrated via the holder 102, there is a large transmission loss of the vibration energy generated by the ultrasonic vibrator 103, and the coefficient of friction of the magnetic tape 92 against the tape guide 101 is reduced as much as possible. It has been pointed out that the effect of sufficiently stabilizing tape running cannot be expected as much as expected. In addition, since the vibration excited in this tape guide lot is a non-standing wave, the vibration tends to vary,
It is difficult to cause the tape guide 101 to resonate together with the magnetic tape 92, and this together with its low attenuation characteristics makes it difficult to obtain stable tape running.

Further, since the tape guide 101 and the upper and lower flanges 104 and 102a that restrict the vertical movement of the magnetic tape 92 during tape running are fixed, the above problems are solved, and the tape guide lot and upper and lower flanges 102a are fixed. It has been desired to develop a tape guide device that can easily adjust the height of the flanges 104, 102a.

SUMMARY OF THE INVENTION Accordingly, the present invention provides a tape guide device that is capable of stabilizing tape running by causing the tape to resonate with a tape guide body, and that also allows the height of the tape guide body to be easily adjusted. be.

An adjusting means for adjusting the height of the tape guide body is provided, and an ultrasonic vibrator for generating standing wave vibration is attached to the tape guide body.

[Function] Since the tape guide body that guides the tape is directly vibrated by an ultrasonic vibrator, vibrations due to standing waves are generated in the tape guide body, and the tape guide body moves in the radial direction of the tape guide body. Easily resonates with tape. Therefore, the coefficient of friction of the tape with respect to the tape guide body becomes as small as possible, and the tape running becomes more stable.

Further, the height of the tape guide body can be easily adjusted by vertically moving the tape guide body using an adjusting means provided on the support shaft.

[Means for Solving the Problems] A cylindrical tape guide body that guides the tape via at least a pair of support members is fitted to a support shaft erected on a base, and the tape guide body [implemented] is fitted to the support shaft. Examples] Examples of the present invention will be described in detail below with reference to the drawings.

In Figs. 1 to 4, IO is a flanged tape guide device, which is attached to an inclined tape guide 2 arranged at the exit and entrance of the VTR's helical scan rotary head drum l shown in Fig. 6. It is a vertical guide type and slide type.

This tape guide device 10 has a slider 11 as a base that moves back and forth from the entrance/exit 3a of the magnetic tape 4 of the tape cassette 3 to around the rotary head drum 1. A support shaft 12 having a threaded portion 12a formed on the upper part is vertically fixed by a presser onto the four parts 1lb formed on the body 11a of the slider l1. This support shaft l2
A cylindrical tape guide body 13 that guides the magnetic tape 4 is loosely fitted between a pair of upper and lower flanges 14 and 15 that restrict movement of the magnetic tape 4 in the width direction. The support shaft l2 between the four parts 1lb of the slider l1 and the lower flange 15 is provided with a curved approximately disc-shaped leaf spring (an elastic member ) 16, and a flange presser l7 is screwed onto the threaded portion 12a of the support shaft 12 to regulate the height position of the upper flange l4. Further, a laminated ultrasonic transducer l8 that generates standing wave vibration is attached and fixed with adhesive or the like to a notch 13a formed in the center of the tape guide body l3.

To be more specific, a rectangular connector board l9 is inserted into the recess lid formed on one side of the slider 11 using a countersunk machine screw 2.
It is fastened and fixed by 0. Also, the slider 1 above
In the recess 1lb of the main body 11a, a long groove-shaped detent hole 11c is formed. The lower part of the locking pin 21 of the lower flange 15 is inserted into the rotation prevention hole 11c.

This lower flange l5 is the concave portion llb of the slider 11.
It is formed into a shape large enough to fit inside, and has a protruding cylindrical portion 15a that is loosely fitted to the support shaft l2 at the center.

A notch 15b is formed on one side of the upper part of the cylindrical portion 15a, and an annular substantially U-shaped groove 15c in cross section is formed in the center thereof into which a rubber O-ring (supporting member) 22 is fitted. It has been done.

The tape guide body l3 is made of metal and has a cylindrical shape, and upper and lower step portions 13b are provided at the upper and lower portions of the inner peripheral surface of the tape guide body l3.
iac is formed. Then, the tape guide body l
3 is loosely fitted into the cylindrical portion 15a of the lower flange l5 and placed on the lower flange l5. The O-ring 22 fitted into the cylindrical portion 15a is connected to the tape guide body l.
The tape guide body l3 is fitted into and locked with the lower step portion 13C of the tape guide body l3, thereby regulating the vertical position of the tape guide body l3.

The ultrasonic transducer 18 is formed by laminating a plurality of piezoelectric elements, and is provided between the upper and lower ends of the notch 13a extending in the longitudinal direction of the tape guide body 13 in the axial direction (longitudinal direction) of the tape guide body 13. They are attached by adhesive or other means so that they are parallel to each other. In addition, the ultrasonic transducer I8
Both sides of the flange 15 are held by a pair of metal pins 25, 25 fitted in a metal holder 24 which is fastened and fixed to the lower flange l5 by screws 23. On the back side of this metal holder 24, there are a plurality of radiation fins 24a,
... is formed protrudingly. Furthermore, silicone resin is injected between the holder 24 and the ultrasonic transducer l8 to provide a heat dissipation effect.

The lower part of the holder 24 is fitted and locked onto the upper part of the locking pin 22 to prevent rotation. As a result, the tape guide body l3 is also prevented from rotating. moreover,
A terminal plate 26 is fastened and fixed to the lower part of the back surface of the holder 24 with a pair of screws 27 and 27.

Further, a cylindrical dirt seat 28 is loosely fitted into the upper step portion 13b of the tape guide body l3.

A notch 28a is formed on one side of the lower part of the upper spacer 28, and a groove 28b having a substantially U-shaped annular cross section into which a rubber O-ring (supporting member) 29 is fitted. has been formed. The O-ring 29 fitted to the upper spacer 28 is fitted and locked to the upper step portion 13c of the tape guide body l3. Also, this Umaza 28
The lower end and the upper end of the cylindrical portion 15a of the lower flange I5 are in contact with each other, and the pair of O-rings 22 and 29 are in a positional relationship such that they are sandwiched between the upper and lower step portions 13b and 13c of the tape guide body l3. be. Furthermore, this pair of O-rings 2
The position 2.29 is set to be at the node of the standing wave vibration generated in the tape guide body l3 via the ultrasonic vibrator l8.

The upper flange l4 is placed on the upper end of each of the tape guide body 13 and the upper spacer 28. This upper flange l4 is formed in the shape of a circular disc, and has a threaded portion 12a of the support shaft l2.
Its height position is regulated by the flange retainer l7 screwed onto the flange retainer l7. This flange presser l7
A U-shaped groove 17a with a minus (1) cross section is formed on the upper surface, and a set screw 3 is provided in the upper part of the central screw hole 17b that is screwed into the threaded portion 12a of the support shaft l2.
0 is screwed on. A pair of upper and lower flanges 14 and 15 that restrict movement of the tape guide body 13 and magnetic tape 4 in the width direction by these leaf springs l6 and flange retainers 17.
An adjusting means 31 is configured to adjust the height of.

Incidentally, the inclined tape guide 2 is also arranged upright on the slider 11 with a predetermined angle of inclination.

According to the tape guide device lO of the above embodiment, the approximately central portion of the tape guide body 13 is directly vibrated by the laminated ultrasonic transducer l8 attached in the longitudinal force direction of the tape guide body l3. Therefore, it is possible to easily cause the tape guide body 13 to resonate together with the magnetic tape 4 in the radial direction of the tape guide body l3 by generating standing wave vibrations in the tape guide body l3. As a result, the resonant frequency of the tape guide body l3 in the laminated ultrasonic transducer l8 can be made higher than that of the prior art. Therefore, the adhesion force of the magnetic tape 4 to the outer peripheral surface of the tape guide body l3 can be made as small as possible, that is, the friction coefficient of the magnetic tape 4 with respect to the tape guide body 13 can be made as small as possible. This makes it possible to further stabilize and improve the running of the magnetic tape 4 in the tape running system.

Furthermore, since the tape guide body l3 is directly vibrated by the laminated ultrasonic vibrator l8, approximately 100% of the vibration energy generated by the laminated ultrasonic vibrator l8 is
can be used to excite the tape guide body 13, resulting in very little energy loss and very high efficiency.

Furthermore, when the resonance frequency is made higher, the heat generated by the laminated ultrasonic transducer l8 is easily radiated to the outside air through the plurality of radiation fins 24a of the holder 24. Damage such as deformation of item 4 can be reliably prevented.

Further, the height of the magnetic tape 4 running around the rotating head drum l is determined by using the flange retainer l7 of the adjusting means 3l as a support shaft l.
The tape guide body 13 and the pair of upper and lower flanges 14.15 are moved upwardly and downwardly along the support shaft 12 via the plate spring 16 according to the amount of screwing into the threaded portion 12a of 2. etc., it can be easily adjusted.

FIG. 7 shows a tape guide device 40 of a second embodiment.

This tape guide device 40 has no upper or lower flanges, and includes a slider (base) 41 and a support shaft 42 that is vertically fixed onto the slider 4l by means such as welding and has a threaded portion 42a formed at the top. A cylindrical body 44 is urged upward by a leaf spring 43 on this support shaft 42, and a pair of rubber O-rings (support members) are attached to the outer peripheral surface of this cylindrical body 44.
45. A tape guide body 46 fitted through 45;
A laminated ultrasonic transducer 4 is attached to the tape guide body 46 and generates standing wave vibration in the tape guide body 46.
7 and the threaded portion 42a of the support shaft 42, and by pressing the upper end of the cylindrical body 44 against the biasing force of the leaf spring 43, the cylindrical body 44 and tape guide body 46
and a presser member 48 that moves both up and down.

The leaf spring 43 and the pressing member 48 constitute an adjusting means 49 for adjusting the height of the tape guide body 46. Similarly to the embodiment described above, the pressing member 48 of the adjusting means 49 is screwed onto the support shaft 42. The height of the tape guide body 46 can be easily adjusted by moving the tape guide body 46 along with the cylindrical body 44 in the vertical direction along the support shaft 42 via the leaf spring 43 depending on the amount of screwing into the portion 42a. It is now possible to do so.

FIG. 8 shows a tape guide device 50 of a third embodiment.

This tape guide device 50 has no upper and lower flanges, and includes a slider (base) 51 and a bolt-like support that also serves as an adjustment means and stands vertically and is screwed into a screw hole 51a on the slider 5l. A shaft 52 and a pair of rubber rings (supporting members) 55 are attached to the outer peripheral surface of the support shaft 52.
．． 55, and a tape guide body 56 that is attached to the tape guide body 56 and
and a laminated ultrasonic transducer 57 that generates standing wave vibration.

The height of the tape guide body 56 can be easily increased by moving the support shaft 52, which also serves as an adjustment means, in the vertical direction together with the tape guide body 5 depending on the amount of screwing into the screw hole 51a of the base 5l. You can now make adjustments.

Although the above embodiment has been described with reference to the case where it is applied to a VTR, the present invention is not limited thereto, and can be applied to various recording and reproducing apparatuses such as tape recorders and information processing apparatuses. Further, in the embodiment and the second embodiment, the leaf springs 16, 43
However, the present invention is not limited to this, and various elastic members such as compression coil springs may be used.

[Effects of the Invention] As described above, according to the present invention, since the tape guide body that guides the tape is directly vibrated by the ultrasonic vibrator, standing wave vibration is generated in the tape guide body. The tape guide body can be easily caused to resonate together with the tape in the radial direction of the tape guide body. Therefore, the coefficient of friction of the tape with respect to the tape guide body can be made as small as possible, and the running of the tape can be further improved.

In addition, the tape guide body, which is fitted to a support shaft erected on the base via at least a pair of support members, is bent so that it can be easily moved up and down by a simple operation of the adjustment means. You can easily adjust the height of your body.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing a tape guide device according to an embodiment of the present invention, FIG. 2 is a side view showing a part of the device in cross section,
Fig. 3 is a plan view of the device, Fig. 4 is a rear view showing a part of the device in cross section, Fig. 5 is a sectional view taken along the line ■-■ in Fig. 2, and Fig. 6 is a cross-sectional view of the device. A schematic plan view of the applied helical scan type tape running system, FIG. 7 is a sectional view of the tape guide device of the second embodiment, FIG. 8 is a sectional view of the tape guide device of the third embodiment, and FIG. 9 is a perspective view of a prior art tape guide device, FIG. 10 is a plan view of the same tape guide device,
FIG. 11 is a schematic plan view of a VTR to which the tape guide device is applied. 4... Tape, 10.40.50... Tape guide device, 1 1, 4.1. 5 1...Slider (base), 12,42.52...Spindle, 13,4
6.56... Tape guide body, 22.29... A pair of O-rings (a pair of supporting members), 45.45... A pair of O-rings (a pair of supporting members), 55.55... A pair ○ ring (pair of support members), 18, 47.57...
Ultrasonic transducer, 31, 49.52...adjustment means. Fig. 2 Fig. 4 Broom 2W V-V ray vinegar
Y diagram No. 6 Perspective view of the advanced technology FIG. 9 FIG. Figure 11 of the VTR used

Claims (1)

[Claims] (1) A cylindrical tape guide body that guides the tape is fitted to a support shaft set upright on a base through at least a pair of support members, and the height of the tape guide body is adjusted to the support shaft. A tape guide device characterized in that an adjusting means is provided and an ultrasonic vibrator for generating standing wave vibration is attached to the tape guide body.