JPH0626989Y2 - Fixed guide block - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Industrial Field of the Invention The present invention relates to a fixed guide block which is fixedly arranged with respect to a rotating cylinder in a magnetic recording / reproducing tape recorder for performing helical scanning and guides a tape, and particularly to a reference surface of an edge guide. The present invention relates to a fixed guide block provided with an inclination angle adjusting mechanism for adjusting the inclination angle with respect to the fixed guide block.

Problems of the prior art Fixed with an edge guide that is fixedly arranged with respect to a rotating cylinder in a magnetic recording / playback tape recorder (hereinafter simply referred to as a recorder) that performs helical scanning, and that adjustably guides the edge level of the magnetic recording tape. The guide block is disclosed in Japanese Utility Model Application No. 62-175168 (filed on November 17, 1987) filed by the present applicant.

The fixed guide block disclosed in this application includes a first tape surface guide formed of a linear ridge oriented perpendicular to a reference surface (eg, a chassis surface) and a linear tape inclined in different directions with respect to the reference surface. Block main body having second and third tape surface guides formed by ridges, edge guide members for adjusting the edge level of the tape guided along these tape surface guides, block main body and edge By being mounted between the guide member and the block body and the edge guide member, the biasing means for biasing the block body and the edge guide member in the direction of separating from each other, the locking pin penetrating the block body, and the locking pin are provided. A locking means for locking the urging force applied to the edge guide member, and a screwing means provided on the locking pin so that the locking means can move in the axial direction of the locking pin. . Thus, by rotating the screwing means, the edge guide member moves along the locking pin, whereby the height of the edge regulating surface of the edge guide member is adjusted.

FIG. 4 is a tape traveling path diagram of a digital audio tape recorder (hereinafter simply referred to as a recorder) incorporating the fixed guide block disclosed in the above-mentioned application. The fixed guide blocks G1 and G2 include the rotary cylinder 7
Are located close to each other. The tape 4 wound around the supply reel 2 and the take-up reel 3 of the tape cassette 1 is pulled out from the cassette by a pair of tape pull-out pins 5 and 6, and fixed guide blocks G1 and G2.
And pressed against the rotary cylinder 7. Between the supply reel 2 and the pull-out pin 5, there are guide pins 8 and 9 and a biasing means 1.
A tension pin 12 arranged on a rotating arm 11 which is biased by 0 is arranged to guide and tension the tape along a desired traveling path. A guide pin 13, a capstan 14, and a pinch roller 15 are arranged between the take-up reel 3 and the pull-out pin 6 to guide the tape along a desired running path and run at a desired speed. Tape pull-out pins 5, 6 and guide pins 8,
9 and 13 are provided with flanges that regulate the edge of the tape to a desired level.

In the pull-out pins 5 and 6, the lower edge of the tape is mainly guided, and the upper edge of the tape is guided in the edge regulating surfaces of the fixed guide blocks G1 and G2. The fixed lead 7a of the rotary cylinder guides the lower edge of the tape.

The above-mentioned first to third tape surface guides in the fixed guide blocks G1 and G2 orient the tape surface guided substantially perpendicularly to the reference surface non-perpendicularly and are guided substantially parallel to the reference surface. The edges of the tape are oriented non-parallel to route the tape in spiral contact with the cylindrical surface of the inclined rotating cylinder over a desired angular range, and then the tape directed from cylinder 7 The tape surface is returned perpendicular to the reference surface and the tape edges that are not parallel to the reference surface are returned parallel.

The above-mentioned fixed guide block has already been put into practical use, and the effect thereof has been improved. However, when adjusting the tape running of the recorder incorporating the fixed guide block, the level of the flanges of the tape pull-out pins 5 and 6 is adjusted. When the tape is adjusted, especially when the flange is moved upward, the upper edge of the tape is strongly pressed against the edge guides of the fixed guide blocks G1 and G2, and the tape surface is curved in the width direction or wrinkles are formed. There is. This state is shown in FIG. In particular, at the rise of an operation mode in which the tape tension changes, such as eject → play, reverse → play, stop → play, etc., a phenomenon in which the front end portion of the envelope waveform of the digital signal from the magnetic head is missing was rarely seen.

In this case, if the edge guide member is moved upward in parallel, the tape is not guided by the fixed lead 7a of the cylinder, which is not desirable. Therefore, it is desirable to adjust the edge regulation surface by inclining it. However, the fixed guide block is a small component, and it is difficult to provide the tilt adjusting means in addition to the level adjusting means for the reference surface of the edge regulating surface.

Means for Solving the Problems In the present invention, the above-mentioned problems are solved by incorporating inclination adjusting means in the edge guide of the fixed guide block.

In the present invention, the block main body and the edge guide member are mounted between the block main body and the edge guide member so that the block main body and the edge guide member are biased in the directions in which the block main body and the edge guide member are separated from each other. An engaging pin, an engaging device provided on the engaging pin, which restricts a relative separating movement of the block main body and the edge guide member against the urging force of the urging device, and the engaging device is a shaft of the pin. In order to be movable in the direction, it is premised that it comprises a screwing means provided on the locking pin.

In the basic configuration of the present invention, the edge guide member can be inclined with respect to the locking pin by making the inner diameter of the insertion hole through which the locking pin of the above-mentioned edge guide member penetrates larger than the outer diameter of the locking pin. A first contact which is slidably inserted in the locking pin between the edge guide member and the locking means arranged in proximity to the edge guide member and which is in surface contact with the locking means. An annular adjusting collar having a contact surface and a second contact surface that comes into surface contact with the edge guide member is incorporated. The second contact surface of the adjusting collar is inclined with respect to the central axis of the locking pin. Thus, when the adjusting collar is rotated, its second abutment surface pivots with respect to the locking pin and the edge guide member brought into surface contact by the biasing means follows it, whereby the inclination of the edge regulating surface. Is adjusted.

Various modifications can be added to the above-described basic structure of the present invention, which will be described through examples.

Action By incorporating the tilt adjusting mechanism in the edge guide, the edge regulating surface of the edge guide can be tilted in the small fixed guide block, and the operability of the adjustment is good.

EXAMPLE FIG. 1 is a front view of a fixed guide block G1 incorporating the edge guide inclination adjusting mechanism of the present invention, FIG. 2 is a sectional view thereof, and FIG. 3 is an exploded view of the fixed guide block G1.

The block body 20 includes a first tape surface guide 21 that is oriented perpendicular to a reference surface (for example, a chassis), second and third tape surface guide members 22 that are inclined in different directions with respect to the reference surface, 23 are provided. The magnetic surface of the tape 4 contacts these tape surface guides and is guided from the left side to the right side in the drawing. 25 is
An auxiliary tape edge guide fixed to the block body and not normally in contact with the tape edge. The features described above are not directly related to the invention of the present application and will not be described in further detail.

Into the pin insertion hole 26 provided in the block body 20, the locking pin 31 is fixed, which is fixed by press-fitting one end 31b thereof into the chassis. Although the inner diameter of the pin insertion hole 26 is set to be larger than the outer diameter of the locking pin 31, a reduced diameter portion 26a having substantially the same diameter as the outer diameter of the locking pin 31 is provided near the lower end of the pin insertion hole 26. And the pin insertion hole 26
Enlarged portion 31 of the locking pin that is set to have the same diameter as the inner diameter of the
a is fitted in the insertion hole below the reduced diameter portion 26a.

In a cylindrical space formed by the pin insertion hole 26 and the locking pin 31, a cylindrical guide having an outer diameter substantially equal to the inner diameter of the pin insertion hole 26 and an inner diameter substantially equal to the outer diameter of the locking pin 31. The spacer 46 is arranged, and the locking pin 31 is inserted into the insertion hole 47. The coil spring 33 is arranged between the reduced diameter portion 26a of the insertion hole and the guide spacer 46, and urges the block body 20 and the guide spacer 46 in a direction in which they are separated from each other.

In the edge guide member 32 arranged above the guide spacer 46, the locking pin 31 is inserted into the pin insertion hole 32a. Here, the inner diameter of the pin insertion hole 32a is set larger than the outer diameter of the locking pin 31, so that the edge regulating surface 32b, which is the lower side surface of the edge guide member 32, can be inclined with respect to the central axis of the locking pin 31. It is like this. Also, the inner diameter of the pin insertion hole 32a and the locking pin 31
Of the edge guide member 32 defines the maximum inclination angle of the edge guide member 32.

A spherical portion 48 is provided at the upper end of the guide spacer 46. Further, a spherical concave portion 32c complementary to the spherical portion 48 is provided in the peripheral portion of the pin insertion hole 32a on the lower side surface of the edge guide member 32, and the spherical concave portion 32c is slidable with respect to each other.

Above the edge guide member 32, an annular adjusting collar 41 having an insertion hole 42 for slidably receiving the locking pin 31 without lateral play is arranged. Here, the lower side surface 44 (FIG. 3) of the adjusting collar 41, which is in surface contact with the upper surface of the edge guide member 32, is inclined at a slight angle (for example, 7 degrees) with respect to the plane orthogonal to the central axis of the insertion hole 42.

Above the adjusting collar 41, a nut 34 that is screwed into a threaded portion 31c provided at the other end of the locking pin 31 is arranged to resist the biasing force of the coil spring 33 that biases the adjusting collar 41 upward. The guide spacer 46 and the edge guide member 32 are locked to the block body 20.

Recall that the inner diameter of the insertion hole 32a of the edge guide member 32 is larger than the outer diameter of the pin 31.
Therefore, the edge guide member 32 is engaged with the locking pin 3 at an angle less than the maximum inclination angle allowed by the difference between the inner diameter and the outer diameter.
When the edge guide member 32 is inclined with respect to 1, the edge guide member 32 is movable in the radial direction with respect to the pin 31.
However, by providing the above-mentioned complementary spherical structure, the above-mentioned movement in the radial direction is prohibited, and the edge guide member 32 is urged by the coil spring 33 to move the edge guide member 32 to the inclined second contact surface 44 of the adjust collar 41. To follow. Further, the sliding relationship between the inner wall of the reduced diameter portion 26a of the insertion hole 26 and the outer wall of the pin 31, the sliding relationship between the outer wall of the guide spacer 46 and the inner wall of the insertion hole 26, and the inner wall of the guide spacer 46 and the pin 31. Depending on the sliding relationship with the outer wall,
The alignment of the central axes of the pin 31 and the insertion hole 26 of the block body 20 is reliably maintained.

The center of the complementary spherical surface is arranged on the edge regulating surface 32b of the edge guide member 32. The reason is,
Edge regulating surface 32 of the edge guide member by the nut 34
When the adjust collar 41 is operated after adjusting the level of b, it is unnecessary to readjust the level of the edge regulation surface 32b again, or the readjustment amount can be minimized.

The edge guide member 32 is arranged so as to fit in the notch portion 27 (FIG. 3) at the top of the block body 20, and prohibits the edge guide member 32 from freely rotating around the pin 31. More specifically, the notch portion 27 shown in FIG. 3 has a wall portion that regulates the back surface of the edge guide member and one side surface (on the right side in FIGS. 1 and 2), thereby allowing the edge to be cut. The rotation of the guide member 32 is prohibited. In this case, in order to allow the turning movement of the edge guide member 32, a slight gap is required between the rotation restricting surface of the cutout portion 27 and the back and side surfaces of the edge guide member.

In use, the nut 34 is rotated in the forward and reverse directions to adjust the distance between the edge regulating surface 32b of the edge guide member and the reference surface, and then the adjusting collar 41 is rotated to move the second contact surface 44. The tilting direction changes due to the pivotal movement with respect to the central axis of the locking pin, and the edge guide member 32 is made to follow it by the coil spring 33, whereby the tilt angle of the edge regulating surface 32b can be adjusted.

In the illustrated embodiment, the upper portion of the adjusting collar 41 is expanded to have a disk shape, and the upper surface (first contact surface) 43 thereof is provided with a diametrically oriented groove 45. As shown. The diameter of the disk-shaped enlarged portion is larger than the diameter of the nut, and the nut 3 is screwed from above the nut 34 by a driver whose tip is bifurcated.
It is possible to rotate the adjusting collar 41 around the locking pin 31 without being disturbed by 4. Insertion hole 26
A concave portion 49 is formed on the lower side surface of the block body 20 adjacent to, and a protrusion (not shown) provided on the chassis.
To fit. Therefore, the block body 20 has the locking pin 31.
And the recess 49 uniquely position the chassis.

The preferred embodiment of the present invention has been described above in detail.
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the technical idea of the present invention.

FIG. 6 shows a guide block G according to another embodiment of the present invention.
1 shows a sectional view of FIG. Locking pin 51 having a large diameter portion 51a at the upper end and a screw portion 51c screwed to the chassis at the lower end
Is inserted into the insertion holes 26, 47, 32a and 42 of the block body 20, the guide spacer 46, the edge guide member 32 and the adjusting collar 41, respectively, as in the above-described embodiment. Further, the coil spring 33 is arranged between the reduced diameter portion 26a of the insertion hole 26 and the guide spacer 46, and urges the block body 20 and the guide spacer 46 in a direction in which they are separated from each other. Therefore, when the pin 51 is screwed into a screw hole (not shown) provided in the chassis, the guide spacer 46 and the edge guide member 32 are resisted against the biasing force of the coil spring 33 that biases the adjusting collar 41 upward. Is
Due to the large diameter portion 51a of the locking pin 51, the block body 20
Locked in.

Since the other structures are almost the same as those of the guide block G1 in the above-mentioned embodiment, the description thereof will be omitted.

In the embodiment described above, the cutout 27
If it is desired to eliminate the gap provided between the rotation restricting surface of the edge guide member and the back surface and the side surface of the edge guide member, the restricting surface of the cutout portion and the facing surface of the edge guide member are centered on the central axis of the pin 31. Formed in concentric circles, and their surfaces are the center points of the turning motion of the edge guide member, that is,
A spherical surface centered on the center of the complementary spherical surface may be used.

Further, the edge guide member 32 and the coil spring 33 may be directly contacted with each other without providing the guide spacer 46.

Further, the outer diameter of the guide spacer 46 is made smaller than the inner diameter of the insertion hole 26 of the block body, the inner diameter of the insertion hole 47 of the guide spacer 46 is made larger than the outer diameter of the locking pin 31,
By making the guide spacer 46 tiltable with respect to the central axis of the locking pin 31, it is not necessary to form the above-mentioned complementary spherical surface provided on the contact surface of the edge guide member 32 and the guide spacer 46. In this case, the stability of the edge guide member and the stability of the engagement relationship between the coil spring 33 and the guide spacer 46 may be somewhat deteriorated. However, it has been found that stability is practically no problem by making the repulsive force of the coil spring 33 sufficiently large. In addition, in the above-described modified example, it seems that the alignment of the central axes of the locking pin 31 and the insertion hole 26 of the block body 20 may become unstable, but the pin 31 is firmly pressed into the chassis. Since the block body is supported by the chassis, and the repulsive force of the coil spring 33 is sufficiently large, there is no concern.

Further, although it is not a good idea from the viewpoint of operability, the adjusting collar 41 may be arranged below the edge guide member 32.

Furthermore, when the edge guide member 32 is tilted downward to the right as shown in FIGS. 1 and 2, the edge regulating surface 32b of the edge guide member and the bottom surface of the cutout portion 27 of the block body 20. A large gap is formed in the left side portion between 27a. In the illustrated state, there is a gap on the right side as well, but depending on the level adjustment of the nut 34, there is a possibility that no gap will be formed on the right side. If the upper edge of the tape penetrates into the gap while the tape is running in this state, the tape may be caught between them and damaged, and in extreme cases, the tape may be broken. To avoid this, the first tape surface guide 21 can be extended above the bottom surface 27a of the cutout portion of the block body 20. In this case, a slight gap must be provided between the upward extension of the first tape surface guide 21 and the edge guide member to allow the swiveling movement of the edge guide member.

Further, although not shown in the drawing, it is desirable to interpose a washer or the like for reducing friction between the nut 34 and the first contact surface 43 of the adjusting collar 41.

Effect of the Invention According to the present invention, the edge guide of the guide block of the invention can be tilted by a simple tilting mechanism, without causing the phenomenon that the front end of the envelope waveform of the output from the magnetic head is chipped. In addition, the fixed guide block and the tape running path can be finely adjusted. Moreover, the inclination of the edge regulating surface of the edge guide can be adjusted without difficulty by adding a mechanism having a simple structure to the extremely small conventional edge guide. Moreover, the adjusting operation is extremely simple.

Although only the fixed guide block G1 has been described above, it is obvious that a similar tilting mechanism can be incorporated in the fixed guide block G2 if necessary.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a fixed guide block G1 incorporating an edge guide inclination adjusting mechanism of the present invention, second is a sectional view thereof, and FIG. 3 is an exploded view of the fixed guide block G1. Fig. 4 is a tape traveling path diagram in a digital audio tape recorder incorporating a conventional fixed guide block, and Fig. 5 is a diagram showing the flanges of tape pull-out pins 5 and 6 in a recorder incorporating a conventional fixed guide block. When the level is moved upward and adjusted, the upper edge of the tape 4 is strongly pressed against the edge guide of the fixed guide block G1, the tape surface is curved in the width direction, and a front view showing a wrinkled state. FIG. 6 is a sectional view of another embodiment of the present invention. Reference numeral 20: block body, 21: first tape surface guide, 2
2, 23: second and third tape surface guides, 25: fixed edge guide, 26: insertion hole, 26a: reduced diameter portion, 27: cutout portion, 27a: bottom surface, 31: locking pin, 32: edge Guide member, 32a: insertion hole, 32b: edge regulation surface, 32c: spherical concave portion, 33: coil spring, 40: tilting mechanism, 41: adjusting collar, 42: insertion hole, 43:
First contact surface, 44: Second contact surface, 45: Groove, 46:
Guide spacer, 47: insertion hole, 48: spherical projection

Claims (3)

[Scope of utility model registration request] 1. A block main body having a plurality of tape surface guides, an edge guide member that is movable relative to the block main body, and the block main body and the edge guide member are biased in a direction in which they are separated from each other. A biasing means, a locking pin that is inserted into an insertion hole provided in the block body and the edge guide member, and locks the block body and the edge guide member so as to be relatively movable.
In a fixed guide block provided on the locking pin and provided with screwing means for adjusting a distance between the block main body and the edge guide member, a: the inner diameter of the insertion hole of the edge guide member is set to the locking pin. The edge guide member can be tilted with respect to the locking pin by making it larger than the outer diameter of the b. B. An annular adjust collar having an abutment surface that contacts the edge guide member slides on the locking pin. A fixed guide block characterized in that the contact surface of the adjusting collar is non-parallel to the surface perpendicular to the central axis of the locking pin. 2. The fixed guide block according to claim 1, wherein the annular guide spacer is inserted into the locking pin between one end of the biasing means and the edge guide member. Is provided, and the outer diameter of the guide spacer and the inner diameter of the pin insertion hole of the block body are made substantially equal to each other so as to be slidably fitted to each other, and the inner diameter of the guide spacer and the outer diameter of the locking pin are almost equal to each other. A fixed guide block, characterized in that they are equally fitted to each other and slidably fitted to each other, and complementary spherical concave portions and spherical convex portions are provided on contact surfaces of the edge guide member and the guide spacer. 3. The fixed guide block according to claim 2 of the utility model registration, wherein the center of the complementary spherical surface is arranged on the edge regulating surface of the edge guide member. Guide block.