JPH0789418B2 - Tape guide device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention is a tape guide device suitable for application to, for example, a video tape recorder, and in particular, a tape is spirally wound around the peripheral surface of a rotary head drum. The present invention relates to a tape guide device that includes a fixed guide that is attached and a roller guide that introduces or draws a tape into or from the fixed guide.

[Outline of Invention]

The present invention is directed to a fixed guide that is disposed so as to be inclined with respect to the peripheral surface of a rotary head drum so that the tape can be spirally wound, and a predetermined center with respect to the center line of the tape that is introduced or led out from the fixed guide. Video consisting of angled roller guides with contact busses of the two guides on the tape path between the fixed guide and the roller guide lying in the same plane so that the tape does not twist between the two guides In a tape guide device such as a tape recorder, a fixed guide is further provided so that the fixed guide and the roller guide can be integrally tilted with respect to the drum while the contact busbars of both guides remain in the same plane. Only the roller guides whose inclination is adjusted together with the contact guides of both guides are in the same plane with each other. By adjusting the tilt angle of the fixed guide with respect to the drum, the roller guide with respect to the fixed guide and the tape can be easily and accurately adjusted in relation to the inclination adjustment of the fixed guide. It is a thing.

[Conventional technology]

2. Description of the Related Art Conventionally, as a tape guide (so-called tilt guide) device for spirally winding a tape around the peripheral surface of a rotary head drum in a video tape collider or the like, a fixed guide made of a cylindrical pin and a roller guide made of a cylindrical rotary roller. , Air guides that lift the tape with air,
Various tape guides are used. As one of these, a tape is spirally wound around the peripheral surface of the drum by a fixed guide that is arranged so as to be inclined with respect to the drum, and a tape that is introduced or led out to this fixed guide is guided by a roller guide. There is a tape guide device. Further, in this tape guide device, the fixed guide and the roller guide are individually configured to be adjusted in inclination.

That is, the tape is twisted by the fixed guide to define the spiral angle of the tape on the circumferential surface of the drum, but the spiral angle is set accurately, but the fixed guide is set to the drum in order to set the spiral angle accurately. Adjust the inclination with respect to.

On the other hand, if the contact generatrix of both guides with respect to the tape path between the fixed guide and the roller guide are not in the same plane, the tape will be twisted between both guides and wrinkles and unreasonable tension etc. will occur on the tape, and the I can't expect the tape to run. Further, since the roller guide is rotated by the tape, unless the roller guide is perpendicular to the center line of the tape, an upward or downward biasing force is generated on the tape. In particular, when the height of the tape is regulated by providing flanges on the upper and lower ends of the roller guide, the upper and lower edges of the tape cannot be accurately regulated by the flange unless the roller guide is perpendicular to the center line of the tape. Moreover, the biasing force causes the upper or lower edge of the tape to come into contact with the flange more strongly than necessary, resulting in damage to the upper or lower edge. Therefore, the roller guide is tilted so that the contact generatrixes of the roller guide and the fixed guide are located in the same plane with each other, and is adjusted so as to be perpendicular to the center line of the tape.

[Problems to be Solved by the Invention] However, as described above, the one in which the fixed guide and the roller guide are individually adjusted in inclination has the following problems.

That is, when the fixed guide is tilted with respect to the drum, the contact state of the tape with the roller guide changes accordingly, so that the roller guide is also adjusted.
At this time, first adjust the inclination of the roller guides so that the contact busbars of both guides are located in the same plane,
Then, the roller guide must be adjusted to be perpendicular to the center line of the tape in two steps and in two directions. Therefore, the adjustment of the roller guide is very troublesome and time-consuming. Moreover, this adjustment requires high precision such that the tape is actually run and the reproduced signal is confirmed by a measuring device, but it is difficult to obtain high precision in the two-step two-direction adjustment.

In view of this, the present invention relates to the adjustment of the inclination of the fixed guide with respect to the drum, and the adjustment of the roller guide with respect to the fixed guide and the tape can be performed easily and with high accuracy.

[Means for solving problems]

According to the present invention, in the above-described tape guide device, a first inclination for integrally adjusting the fixed guide and the roller guide with respect to the rotary head drum in a state where the contact generatrixes of both guides are in the same plane. Only the adjustment mechanism and the roller guide that is tilt-adjusted integrally with the fixed guide,
A second inclination adjusting mechanism is provided for adjusting the contact generatrix of both guides to a predetermined angle with respect to the center line of the tape in a state where the contact generating lines are in the same plane.

[Action]

According to the present invention, when adjusting the inclination of the fixed guide with respect to the drum, the inclination of the roller guide is adjusted integrally with the fixed guide, and the contact busbars of these two guides are maintained in the same plane. Therefore, it is not necessary to adjust the inclination of the roller guides again so that the contact generatrixes of both guides are located in the same plane.

When the roller guide is adjusted to a predetermined angle with respect to the center line of the tape, the roller guide has already been tilted integrally with the fixed guide, and the contact generatrixes of both guides are in the same plane as each other. , The adjustment can be done easily.

〔Example〕

An embodiment in which the present invention is applied to a tape guide device of a video tape recorder will be described below with reference to the drawings.

First, as shown in FIG. 2, a pair of tape guide devices 2 are arranged close to the peripheral surface of a fixed head drum (hereinafter simply referred to as a drum) 1. Each of the tape guide devices 2 is composed of a fixed guide 3 formed of a cylindrical pin that is inclined with respect to the drum 1, and a roller guide 4 formed of a cylindrical rotating roller that is close to the fixed guide 3. Further, both tape guide devices 2 are arranged so as to have a vertical step. Then, the tape 5 is introduced into or drawn out from the fixed guides 3 by the roller guides 4, and the tape 5 is wound around the peripheral surface of the drum 1 in a predetermined spiral state in an approximately Ω shape by the fixed guides 3. The drum 1 is composed of a fixed drum 6 arranged at the lower part and a rotating drum 7 arranged at the upper part, and the tape 5 has its lower edge 5b guided by a tape lead 8 formed on the fixed drum 6. It is wound over the fixed drum 6 and the rotating drum 7. The tape 5 is run at a constant speed in the direction of arrow b while the rotary drum 7 is rotated at high speed in the direction of arrow a, and desired recording or reproduction is performed by the plurality of rotary heads 9 provided on the outer periphery of the lower end of the rotary drum 7. Be seen.

Next, details of the tape guide device 2 will be described. Since both tape guide devices 2 are symmetrical, the description will be given on the tape supply side (right side in FIG. 2).

First, as shown in FIGS. 1 and 3 to 5, the tape guide device 2 is provided with a first inclination adjusting mechanism 11. That is,
A first adjusting table 13 is mounted on the tape guide block 12. The first adjustment table 13 is made of a metal having an appropriate elasticity such as brass, and the slit 14 allows the movable portion 15 to move.
And the fixed portion 16 are configured. The fixing portion 16 is fixed on the tape guide block 12 by screwing or the like. Two adjusting screws 17 and 18 are inserted into the slot 14, one adjusting screw 17 is screwed into a screw hole 19 of the movable part 15 and its tip is brought into contact with the fixed part 16, and the other is adjusted. The adjusting screw 18 is inserted into the insertion hole 20 of the movable portion 15, and its tip is screwed into the screw hole 21 of the fixed portion 16. By the way, the movable part
The reference numeral 15 is formed by a mounting wall 22 and a support wall 23, each of which has a vertical shape, into a substantially L-shape in a plan view. And mounting wall
The fixed guide 3 is fixed by an adhesive 25 to a corner portion of the protrusion 22 formed on the outer side of the mounting wall 22 and 22. The fixed guide 3 is made of ceramics.

Next, as shown in FIGS. 1 and 3 to 7, the tape guide device 2 is provided with a second inclination adjusting mechanism 27. That is,
A second adjusting table 28 is attached to the first adjusting table 13. The second adjusting table 28 is composed of a vertical portion 29 having a substantially L shape in a plan view and a bottom portion 30 formed under the vertical portion 29, and a guide shaft 31 is vertically planted on the bottom portion 30. ing. The roller guide 4 is rotatably supported on the guide shaft 31. The roller guide 4 has upper and lower flanges 32a and 32b at its upper and lower ends, and is configured to be vertically adjustable in height. Reference numeral 33 is a compression coil spring for biasing when adjusting the height. One side of the vertical portion 29 of the second adjusting table 28 is rotatably supported by the fulcrum shaft 34 of the support wall 23 of the first adjusting table 13. As shown in FIGS. 3 and 5, the fulcrum shaft 34 has its axis orthogonal to the guide shaft 31 which is the axis of the roller guide 4, and its height is the center of the height (vertical width) of the roller guide 4. Is located in. Next, as shown in FIG. 7, a screw hole 35 is vertically provided at the upper end of the vertical portion 29, and a horizontal hole 36 is provided so as to communicate with the lower end of the screw hole 35. Then, the adjusting screw 37 is screwed into the screw hole 35, and the conical tip of the adjusting screw 37 is inserted into the lateral hole 36.
The steel ball 38 is brought into contact with the mounting wall 22 of the first adjusting base 13
Is in contact with. A spherical surface may be formed at the tip of the adjusting screw 37 and a conical piece may be inserted into the lateral hole 36. A recess 39 is formed in the lower portion of the vertical portion 29, and a compression coil spring 40 is inserted in the recess 39. Also the first adjustment table
A lock screw 41 is screwed into the support wall 23 of 13 and one side portion of the vertical portion 29 of the second adjusting base 28, and the lock screw 41 allows the first screw
The second adjusting table 28 is locked to the adjusting table 13 of FIG.

By the way, FIG. 8 shows a method of attaching the fixed guide 3 to the first adjusting table 13. That is, V is applied to the reference block 43.
A groove 44 is formed, and the guide shaft 31 of the second adjusting table 28 supported by the first adjusting table 13 is engaged with the V groove 44, and the mounting wall 22 of the first adjusting table 13 is attached. End face as a reference block
The guide shaft 31 is brought into contact with the protrusion 45 of 43, and the guide shaft 31 is fixed by a retainer 46. Then, the fixed guide 3 is pressure-bonded to the outer surface of the mounting wall 22 and the upper surface of the reference block 43 by the leaf spring 47, and the adhesive 25 is injected into the gap between the fixed guide 3 and the protrusion 24 to fix the fixed guide 3 and the protrusion 24. In addition, the V groove 44 is formed to be large so that the roller guide 4 can be directly connected.
May be engaged. Further, FIG. 9 shows that an inverted trapezoidal dovetail groove 48 is formed in the fixed guide 3, and an adhesive 25 is provided in the dovetail groove 48.
Is injected to fix the fixed guide 3 more firmly. In addition to adhesion, screwing or the like may be used.

By fixing the fixed guide 3 to the first adjusting table 13 as described above, the parallelism between the fixed guide 3 and the roller guide 4 is set within 20 μm in this embodiment. That is, in FIG. 2, the contact buses P ₁ and P ₂ of both guides 3 and 4 with respect to the tape path R ₁ between the fixed guide 3 and the roller guide 4 are located in the same plane.

Next, the adjustment of the fixed guide 3 and the roller guide 4 of the tape guide device 2 configured as described above will be described.

First, referring to FIGS. 3 to 5, the adjusting screw of the first adjusting table 13
By tightening or loosening 17 and 18 to each other, the movable portion 15 is bent in the direction of arrow c or d with respect to the fixed portion 16 by utilizing the bending rigidity of the slot 14, and the fixed guide 3 is attached to the drum 1. On the other hand, the inclination is adjusted in the direction of arrow c or d.
The direction of this arrow c or d is parallel to the tape path R ₂ between the drum 1 and the fixed guide 3, whereby the helix angle of the tape 5 with respect to the drum 1 is adjusted.

Although not shown, the two tape guide blocks 12 of the two tape guide devices 2 are guided by a pair of guide rails on both outer sides of the drum 1 to guide the tape 5 from the tape cassette.
2 and the tape 5 is wound around the peripheral surface of the drum 1. In the state of FIG. 2, the tape guide block 12 itself is inclined with respect to the drum 1. Therefore, the tilt adjustment of the fixed guide 3 by the first tilt adjusting mechanism 11 is a fine adjustment.

By the way, when adjusting the inclination of the fixed guide 3, the first adjusting table 13
Since the vertical portion 29 of the second adjusting base 28 is supported by the supporting wall 23 of the movable part 15 of the second adjusting base 28, the second adjusting base 28 is inclined integrally with the movable part 15 in the direction of arrow c or d, and The guide 4 is also tilt-adjusted integrally with the fixed guide 3 in the arrow c or d direction. Therefore, in FIG. 2, the contact bus lines P ₁ and P ₂ of both guides 3 and 4 with respect to the tape path R ₁ between the fixed guide 3 and the roller guide 4 are maintained in the same plane with each other. The tape 5 is not twisted between the guides 3 and 4. That is, after adjusting the inclination of the fixed guide 3, it is not necessary to adjust the inclination of the roller guide 4 again so that the contact generatrixes P ₁ and P ₂ of the two guides 3 and 4 are located in the same plane.

Next, referring to FIGS. 6 and 7, the adjusting screw 37 of the second adjusting table 28 is used.
By tightening or loosening, the steel ball 38 is moved in the lateral hole 36, and the second adjusting base 28 rotates in the direction of arrow e or f around the fulcrum shaft 34 by the cooperation action with the compression coil spring 40. Be moved. As a result, the roller guide 4 is also rotated in the direction of arrow e or f, and the roller guide 4 is adjusted to be perpendicular to the center line P _{3 of the} tape 5 in FIG. After that, tighten the lock screw 41 to secure the roller guide 4
Lock in the adjusted state.

By the way, at this time, the roller guide 4 is already tilt-adjusted integrally with the fixed guide 3, and the adjustment busbars of both guides 3 and 4 are adjusted.
With P ₁ and P ₂ lying in the same plane as each other, the roller guide 4 can be easily adjusted to be perpendicular to the center line P ₃ of the tape 5. As a result, the upper and lower edges 5a and 5b of the tape 5 can be accurately regulated by the upper and lower flanges 32a and 32b without generating an upward or downward biasing force on the tape 5.

Further, since the fulcrum shaft 34 of the second adjusting table 28 has its axis line orthogonal to the axis line of the roller guide 4 and its height is located at the center of the height (vertical width) of the roller guide 4, In FIG. 2, the roller guide 4 has a contact bus P ₂ and a center line P _{3 of the} tape 5.
It will be rotated centering on the fulcrum O of. Therefore, the distance of the center line P ₃ of the tape 5 in the tape path R ₁ between the guides 3 and 4 does not change at all, so that the tape path R ₁
It is possible to minimize the change in the distance between the contact busbars P ₁ and P ₂ with respect to, and there is no large difference in tension between the upper and lower edges 5a and 5b of the tape 5.

In the embodiment, as shown in FIG. 3, the tape guide path R ₁ between the fixed guide 3 and the roller guide 4 has a second surface relative to the surface Q ₁ .
Since the rotation surface Q ₂ of the adjusting table 28 is inclined, the contact bus P ₂ of the roller guide 4 is slightly displaced by the rotation of the second adjusting table 28. However, the inclination angle of the roller guide 4 is in the range of fine adjustment as in the inclination adjustment of the fixed guide 3 described above, and is also related to the diameter of the roller guide 4, so there is no problem. Of course, rotation plane Q ₂ with respect to the surface to Q ₁ tape path R ₁ is configured so as to be parallel, the contact generatrix of the roller guide 4
It is easy to ensure that P ₂ does not shift at all.

By the way, the second inclination adjusting mechanism 27 in the embodiment moves the steel ball 38 by tightening or loosening the adjusting screw 37, and the cooperation between the steel ball 38 and the compression coil spring 40 causes the adjusting screw 37 to move. Since the vertical movement is converted into the rotation of the second adjusting table 28, the fine adjustment of the roller guide 4 can be performed from above with extremely high precision.

Although one embodiment of the present invention has been described above, the present invention is not limited to the embodiment, and various effective modifications can be made based on the technical idea of the present invention.

For example, in the embodiment, the second adjusting table is pivotally supported on the first adjusting table, and the fixed guide is tilted integrally with the roller guide by the first tilt adjusting mechanism. It is also possible to adjust the inclination of the roller guide in conjunction with the adjustment.

Further, in the embodiment, the roller guide is adjusted so as to be perpendicular to the center line of the tape, but the roller guide is slightly inclined with respect to the center line of the tape so that a tension difference is intentionally applied to the upper and lower edges of the tape. It also includes making adjustments.

The present invention is not limited to the tape guide device of the video tape recorder, but can be applied to various recording / reproducing devices and tape guide devices of information processing devices.

〔The invention's effect〕

According to the present invention, when adjusting the inclination of the fixed guide with respect to the drum, the inclination of the roller guide is adjusted integrally with the fixed guide. Therefore, the roller guide is re-arranged so that the contact generatrixes of both guides are located in the same plane. There is no need to adjust the tilt. Only the roller guide whose inclination is adjusted integrally with the fixed guide can be adjusted to a predetermined angle with respect to the center line of the tape in a state where the contact generatrixes of both guides are in the same plane.

That is, the adjustment of the roller guide related to the adjustment of the inclination of the fixed guide with respect to the drum does not require the adjustment of the inclination with respect to the fixed guide, and only the adjustment in one step in one direction with respect to the tape is necessary. It is easy and can be done in a short time. In addition, the adjustment in one step and one direction can be extremely easily performed with high precision such that the tape is actually run and the reproduced signal is confirmed by the measuring device. Therefore, productivity and serviceability can be remarkably improved and reliability can be remarkably improved.

[Brief description of drawings]

The drawings show an embodiment in which the present invention is applied to a tape guide device of a video tape recorder. FIG. 1 is an exploded perspective view, FIG. 2 is a schematic perspective view of a tape running system, and FIG. 3 is a plan view. Figures and 4 are partially cutaway side views, and Figure 5 is Figure 3 V
-V line arrow sectional view, FIG. 6 is a front view, FIG. 7 is FIG. 3 VI
Fig. 8 is a sectional view taken along the line I-VII, Fig. 8 is a sectional view for explaining the mounting of the fixed guide, and Fig. 9 is a sectional view showing another mounting example. In the reference numerals used in the drawings, 1 ... Rotating head drum 2 ... Tape guide device 3 ... Fixed guide 4 ... Roller guide 5 ... Tape 11 ... First tilt adjusting mechanism 13 ... First adjustment Platform 15 …… Movable part 17,18 …… Adjustment screw 27 …… Second tilt adjusting mechanism 28 …… Second adjustment base 34 …… Fulcial shaft 37 …… Adjustment screw R ₁ …… Tape path P ₁ , P ₂ …… Contact bus P ₂ …… Center line.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-59-77665 (JP, A) Actual development Shou 60-26655 (JP, U) JP-B 60-58538 (JP, B2)

Claims (1)

[Claims] 1. A fixed guide, which is disposed so as to be inclined with respect to the drum so as to spirally wind the tape around the peripheral surface of the rotary head drum, and a center line of the tape introduced or led out from the fixed guide. The roller guides are arranged at a predetermined angle, and the contact generatrixes of both guides with respect to the tape path between these fixed guides and the roller guides are positioned in the same plane so as not to twist the tape. In the tape guide device described above, a first tilt adjusting mechanism for integrally adjusting the fixed guide and the roller guide with respect to the drum in a state where contact busbars of the two guides are in the same plane. And only the roller guide whose inclination is adjusted integrally with the fixed guide, the contact busbars of both guides are in the same plane. Tape guide apparatus is characterized by providing a second tilt adjustment mechanism for adjusting a predetermined angle with respect to the tape centerline in the state of.