JPH0540993A - Tape guide device - Google Patents

Abstract

PURPOSE:To make the guidance and travelling of the tape satisfactory, to reduce the number of parts and to simplify construction by preventing the attenuation of the vibration of a guide member due to the pressure to the end part of the guide member by the other parts while fixedly supporting a supporting projection formed on a main axis and the guide member by means of elastic adhesive and preventing the movement of the guide member in the main axis direction and in the rotational direction. CONSTITUTION:The tape guide device is provided with a pipe-shaped guide member 102 guiding a tape, an ultrasonic vibrator 104 the other end of which is fixed to the guide member 102 and standing-wave oscillating the guide member 102, and supporting projections 105a and 105b formed on a main axis 101. The guide member 102 and supporting axes 105a, 105b are adhered by adhesive, and the guide member 102 is supported at the nodes of the oscillation to be generated on the guide member 102.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape guide device suitable for application to, for example, a video tape recorder.

[0002]

2. Description of the Related Art Tape guide devices used for video tape recorders and the like are roughly classified into rotary type and fixed type.

The rotary type is characterized in that running resistance applied to the tape is small. However, for example, if the rotation unevenness of the bearing to be used appears as running unevenness of the tape, or if the running direction of the tape is not at right angles to the rotating direction of the rotating roller, the tape will exert force in the width direction from the roller. There were drawbacks such as receiving.

Particularly, in the latter defect, the tape may be moved in the width direction to damage the edge of the tape. Therefore, when a rotary type tape guide device is used, it is necessary to make the precision of parts and the assembling precision extremely high, and it is difficult to manufacture.

On the other hand, although the fixed type makes the running of the tape stable, it has a drawback that the running resistance of the tape is large.

For these reasons, there is a demand for a tape guide device which is of a fixed type and has a small tape running resistance. One example is an air guide.

This air guide is a system in which air is jetted from a small hole provided on the surface of the guide body to float the tape and reduce the running resistance of the tape. However, even with this air guide, new problems occur such as the need for a compressor as an air source.

In order to solve such drawbacks and problems, the present applicant has previously proposed an ultrasonic vibration tape guide device using ultrasonic waves (Japanese Patent Application No. 02-103627).

In this ultrasonic vibration tape guide device, it is possible to reduce the running resistance of the tape while maintaining the stability of the fixed type tape running.

The height of the ultrasonic vibration tape guide device can be adjusted. Hereinafter, with reference to FIG.
This ultrasonic vibration tape guide device will be described.

In FIG. 9, reference numeral 5 is a main shaft that is planted on the base 18. The guide member 2 to which the ultrasonic exciter 3 is fixed is supported by a cylindrical support shaft 7 made of brass and having a support protrusion 7b.

The lower and upper flanges 9 and 10 are arranged so as to abut on the upper and lower ends of the support shaft 7, and serve to guide the edge portion of the tape wound around the guide member 2.

The main shaft 5 is configured to pass through the lower and upper flanges 9 and 10 and the support shaft 7.

Reference numeral 6 is a height adjusting screw which is fitted to the inner periphery of the upper end of the support shaft 7 and is screwed into a screw 23 formed at the end of the main shaft 5.

Reference numeral 8 is a mounting member.
An upper flange 10 is fixed to an upper portion of the mounting member 15 by a mounting screw 15, and a lower flange 9 is fixed to a lower portion of the mounting member 8 by fixing pins 22 and 24.

As shown in FIG. 10, the element accommodating portion 8a of the mounting member 8 is formed by forming a rectangular parallelepiped hole having side walls 8b left on both sides, and stopper fitting holes 8c are formed on both side walls 8b. Has been done.

A stopper projection 39a of a disk-shaped stopper 39 made of rubber is fitted into the stopper fitting hole 8c.
The ultrasonic exciter 3 is clamped by the stopper 39 to prevent the guide member 2 from rotating.

The mounting member 8 serves to keep the lower and upper flanges 9 and 10 parallel to each other and to keep the distance therebetween larger than the length of the guide member 2 by about 0.1 mm.

As shown in FIG. 9, the lower flange 9 is pushed upward by the biasing force of the coil spring 35 arranged on the outer periphery of the main shaft 5 between the lower flange 9 and the base 18.

A pin insertion hole 20 is formed in the base 18, and a fixing pin 22 which is erected on the lower surface of the lower flange 9 is inserted into the insertion hole 20.

In such a structure, the height adjusting screw 6
When is rotated, the height of the guide member 2 can be adjusted by the biasing force of the coil spring 35 and by the biasing force.

FIG. 11 shows a state of standing wave vibration generated in the guide member 2 when an AC voltage is applied to the ultrasonic exciter 3 by a line X.
It is cut and cut with -X and displayed.

As shown in FIG. 11, the dotted line NN is the node portion, and the amplitude is zero on this line.
When the distance from the end face of the guide member 2 to the position of the node is n, the axial position of the support protrusion 7b is provided at a distance n from the end face of the guide member 2.

[0024]

As is apparent from the above, in the above example, the length between the upper flange 10 and the lower flange 9 mounted on the mounting member 8 is adjusted by adjusting the height adjusting screw 6. From the length of the guide member 2, 0.
The upper and lower flanges 10 and 9 are kept so as not to press the end portions of the guide members by keeping them larger by about 1 mm, and further, the supporting protrusions 7b are positioned at axial positions of n from the both ends of the guide member 2, respectively. The position is made to contact the inner surface of the guide member 2.

For this reason, the upper and lower flanges 10 and 9,
There are inconveniences in that many highly accurate parts such as the height adjusting screw 6 are required and the assembly work becomes difficult due to the complicated structure.

Further, since the upper and lower flanges 10 and 9 press the upper and lower ends of the guide member 2 respectively, the vibration of the guide member 2 is attenuated and the tape cannot be guided and run well. there were.

The present invention has been made in view of the above point, and prevents the vibration of the guide member from being attenuated by the pressure of the other member on the end portion of the guide member, thereby favorably guiding the tape and running the tape. While you can
An object of the present invention is to propose a tape guide device that can reduce the number of parts and simplify the structure.

[0028]

The tape guide device of the present invention is, for example, as shown in FIGS. 1 to 8, a pipe-shaped guide member 102 for guiding a tape 109, a free end at one end, and a guide member at the other end. Guide member 10 fixed to 102
2 and supporting members 105a, 105b, 11 for supporting the guide member 102.
0; 106a, 106b, 110; 107a, 107
b, 101a, and 102a, the guide member 102 is elastically supported at a node of vibration generated on the guide member 102.

[0029]

According to the present invention described above, since the guide member 102 is elastically supported at the node of the vibration generated on the guide member 102, it is possible to prevent the end portion of the guide member from being pressed by other parts. It is possible to improve the guide to the tape and the running of the tape without damaging the vibration of the guide member, reduce the number of parts, and simplify the structure.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the tape guide device of the present invention will be described in detail below with reference to FIG.

In FIG. 1, reference numeral 100 denotes a base, on which the main shaft 101 is mounted so as to stand upright.

A guide member 102 made of, for example, ceramic is mounted on the main shaft 101, and one end face of the ultrasonic vibration exciter 104 is fixed to a predetermined position on the outer peripheral surface of the guide member 102 with, for example, an adhesive material.

Lead wires 103a and 103b for power supply are connected to the upper and lower parts of the ultrasonic exciter 104 in the figure.

The tape guide device main body 20 includes the above-mentioned components.
Configure 0. Note that FIG. 3 is a top view of the tape guide device 200.

Further, as shown in FIG. 2, support protrusions 105a and 105b are formed (or attached or fitted) on the upper and lower peripheral surfaces of the main shaft 101.

When the tape guide device main body 200 is driven, the standing wave formed on the guide member 102 also becomes as shown in FIG. 11 in this example.

That is, as shown in FIG. 11, the dotted line NN is a node portion, and the amplitude is "0" on this line, and by supporting the guide member 102 along this line,
Vibration damping due to support can be minimized.

Therefore, assuming that the distance from the end face to the position of the node in FIG. 11 is n, the axial positions of the support protrusions 105a and 105b are the guide members 10 as shown in FIG.
It should be provided at a distance of n from the upper and lower ends of 2.

FIG. 4 is an enlarged view of a portion indicated by x in FIG.
As shown in FIG. 5, a gap is formed between the outer peripheral surfaces of the support protrusions 105a and 105b and the inner peripheral surface of the guide member 102.

Then, as shown in FIG. 4, an adhesive 1 having a low hardness after curing and elasticity like rubber is present in this gap.
Fill 10.

The support protrusions 105a and 105b are elastically fixed to the guide member 102 by the adhesive 110 and are held in a state of facing the vibration nodes of the guide member 102, respectively.

Therefore, due to the elasticity of the adhesive, the vibration of the guide member 102 can be minimized, and the guide member 102 is prevented from moving in the axial direction and rotating around the main shaft 101. To prevent.

Now, as shown in FIG. 1, the tape 109 is guided and run by the guide member 102, and an AC voltage corresponding to the resonance frequency of the lead wire is supplied to the tape guide device main body 200 by a drive circuit (not shown). 103
When supplied via a and 103b, the guide member 102
A standing wave is generated in the tape 109 and the guide member 10
The coefficient of friction between the two tapes 1
It is reduced to a fraction of that in the case of driving 09.

Thus, in this example, the spindle 101
Since the supporting protrusions 105a and 105b formed in the above and the guide member 102 are elastically fixed and supported by the adhesive 110 having elasticity, the movement of the guide member 102 in the axial direction and the rotation direction of the main shaft 101 is prevented. For example, the guide member 102 made of other parts such as upper and lower flanges.
It is possible to improve the guiding and running of the tape 109 with respect to the tape 109 by suppressing the vibration of the guide member 102 due to the pressure on the end portion of the guide member, the support of the guide member 102 having no elasticity, and the like, and the number of parts is reduced, and the structure is reduced. Can be simplified. Further, as a result, the assembly of the tape guide device main body 200 is simplified, and the manufacturing process thereof can be simplified.

FIGS. 5 and 6 show another example 1 of the tape guide device of this embodiment, which will be described below with reference to FIGS. 5 and 6 in correspondence with the tape guide device described in FIGS. The same reference numerals are given to the portions to be described, and detailed description thereof will be omitted.

That is, as shown in FIG. 6, which is an enlarged view of the portion indicated by x in FIG. 5, the groove 1 is provided at a predetermined position above and below the main shaft 101.
01a are formed, and rubber O-rings 106a and 106b are fitted into these grooves 101a, respectively, and are bonded with an adhesive 110 at the time of fitting, or by baking, the groove 101a of the main shaft 101 and each O-ring 106b, 106b.
Fix between b.

Further, the O-rings 106a and 106b fixed to the main shaft 101 and the inner peripheral surfaces of the guide member 102 are adhered to each other with an adhesive 110 or fixed by baking.

The O-rings 106a and 106b are elastically fixed to the guide member 102 by the adhesive 110 or baking, and are held in a state of facing the vibration nodes of the guide member 102, respectively.

Therefore, due to the elasticity of the adhesive 110 and the rubber O-rings 106a and 106b, the guide member 1
02 vibration damping can be minimized,
The movement of the guide member 102 in the axial direction of the main shaft 101 and the rotation around the main shaft 101 are prevented.

Now, as shown in FIG. 5, the tape 109 is guided and run by the guide member 102, and an AC voltage corresponding to the resonance frequency of the lead wire is supplied to the tape guide device main body 200 by a drive circuit (not shown). 103
When supplied via a and 103b, the guide member 102
A standing wave is generated in the tape 109 and the guide member 10
The coefficient of friction between the two tapes 1
It is reduced to a fraction of that in the case of driving 09.

Thus, in this example, the spindle 101
Of the main shaft 101 of the guide member 102 by fitting it into the groove 101a of the guide member 102 and elastically fixing the elastic adhesive 110 or the O-rings 106a and 106b fixed by baking and the guide member 102 between the guide member 102 and the elastic adhesive 110 or baking. Since the movement in the axial direction and the rotation direction is prevented, the guide member 10 is pressed by pressing the end portion of the guide member 102 by another component such as upper and lower flanges.
It is possible to improve the guiding and running of the tape 109 with respect to the tape 109 by eliminating the vibration damping of No. 2, and to reduce the number of parts and simplify the structure. Further, as a result, the assembly of the tape guide device main body 200 is simplified, and the manufacturing process thereof can be simplified.

FIGS. 7 and 8 show another example 2 of the tape guide device of this embodiment, which will be described below with reference to FIGS. 7 and 8 and corresponds to the tape guide device described in FIGS. The same reference numerals are given to the portions to be described, and detailed description thereof will be omitted.

That is, as shown in FIG. 6 in which the portion indicated by x in FIG. 7 is enlarged, the groove 1 is provided at a predetermined position above and below the main shaft 101.
01a is formed, and the groove 102a is formed at a predetermined position above and below the inner peripheral surface of the guide member 102.

Then, for example, rubber O-rings 107a and 107b are fitted into the grooves 101a and 102a.

These O-rings 107a and 107b are formed in the groove 101a of the main shaft 101 and the groove 102a of the guide member 102.
As a result, they are held so as to face the vibration nodes of the guide member 102, respectively.

Therefore, these rubber O-rings 107a
By virtue of the elasticity of the guide members 107 and 107b, the vibration of the guide member 102 can be minimized and the guide member 1
02 to prevent the spindle 101 from moving in the axial direction.

As shown in FIG. 7, a detent 108 having a recess 108a at its tip is formed at a predetermined position of the base 100, and the ultrasonic exciter 104 fixed to the guide member 102 is detented. The concave portion 108a of 108 is clamped.

This makes it possible to prevent the guide member 102 from rotating in the rotation direction of the main shaft 101.

Now, as shown in FIG. 7, the tape 109 is guided and run by the guide member 102, and an AC voltage corresponding to the resonance frequency of the lead wire is applied to the tape guide device main body 200 by a drive circuit (not shown). 103
When supplied via a and 103b, the guide member 102
A standing wave is generated in the tape 109 and the guide member 10
The coefficient of friction between the two tapes 1
It is reduced to a fraction of that in the case of driving 09.

Thus, in this example, the spindle 101
The guide member 102 is supported by the rubber O-rings 107a and 107b held by the groove 101a of the guide member 102 and the groove 102a of the guide member 102, and the movement of the guide member 102 in the axial direction of the main shaft 101 is prevented. The ultrasonic exciter 104 fixed to the guide member 102 is sandwiched by the recess 108a, and the main shaft 10 of the guide member 102 is sandwiched.
1 is prevented from moving in the rotation direction, the guide member 102 formed of other parts such as upper and lower flanges is used.
It is possible to prevent the vibration of the guide member 102 from being damped due to the pressure applied to the end of the tape, to improve the guiding and running of the tape to the tape 109, reduce the number of parts, and simplify the structure. Further, as a result, the assembly of the tape guide device main body 200 is simplified, and the manufacturing process thereof can be simplified.

The present invention is not limited to the above-mentioned embodiments, and it goes without saying that various other configurations can be adopted without departing from the gist of the present invention.

[0062]

According to the present invention described above, the guide member is elastically supported at the node of the vibration generated on the guide member, so that the end portion of the guide member is pressed by another component. There is an advantage that not only the vibration of the guide member is not damped but also the guiding and running of the tape can be improved, and the number of parts can be reduced and the structure can be simplified.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a tape guide device of the present invention.

FIG. 2 is a sectional view showing an embodiment of the tape guide device of the present invention.

FIG. 3 is a top view showing an embodiment of the tape guide device of the present invention.

FIG. 4 is a partially enlarged cross-sectional view of an embodiment of the tape guide device of the present invention.

FIG. 5 is a cross-sectional view showing another example 1 of the tape guide device of the present invention.

FIG. 6 is an enlarged sectional view of a part of another example 1 of the tape guide device of the present invention.

FIG. 7 is a cross-sectional view showing another example 2 of the tape guide device of the present invention.

FIG. 8 is an enlarged sectional view of a part of another example 2 of the tape guide device of the present invention.

FIG. 9 is a cross-sectional view showing an example of a conventional tape guide device.

FIG. 10 is a plan view of an example of a conventional tape guide device.

FIG. 11 is a graph for explaining the conventional and inventive tape guide devices.

[Explanation of symbols]

 100 Base 101 Spindle 101a Groove 102 Guide member 102a Groove 104 Ultrasonic exciter 105a, 105b Support protrusion 106a, 106b O-ring 107a, 107b O-ring 108a Recess 108 Rotation stopper 109 Tape 110 Adhesive

Claims (1)

[Claims] 1. A pipe-shaped guide member for guiding a tape, an ultrasonic exciter having one free end and the other end fixed to the guide member to vibrate the guide member in a standing wave, and the guide member. And a support member for supporting the guide member, and the guide member is elastically supported at a node of vibration generated on the guide member.