JPH04105252A - Magnetic tape guide height adjusting device - Google Patents

Abstract

PURPOSE:To facilitate the height adjustment of a leading guide with high accuracy and to smoothly and quickly perform the draw-out operation of a magnetic tape from a cassette by forming an oblique plane on either the guide plane of a guide member which performs the height adjustment of the leading guide or the outer peripheral plane of a guide pin, and adjusting the height of the leading guide by moving the guide member. CONSTITUTION:Either the guide plane of the guide member 33 or the outer peripheral plane of the guide pin 31 is formed obliquely against the axial direction of the guide pin 31, and the abutting position of the guide plane with the guide pin 31 is set movably in the axial direction of the guide pin 31. Since at least either the guide plane of the guide member 33 or the outer peripheral plane of the guide pin 31 is formed obliquely against the axial direction of the guide pin 31, the leading guide 30 can be moved in a direction intersecting orthogonally to the axial direction via an arm 29 on which the guide pin 31 is fixed by moving the guide member 33 in the axial direction of the guide pin 31. Thereby, it is possible to facilitate the height adjustment of the leading guide with high accuracy, and to smoothly and quickly perform the draw-out operation of the magnetic tape from the cassette.

Description

[Detailed Description of the Invention] [Objective of the Invention j (Industrial Application Field) This invention is provided in a magnetic recording/reproducing device,
The present invention relates to a tape guide height adjusting device for adjusting the height of a tape guide (hereinafter simply referred to as tape) during loading.

(Prior Art) Conventionally, in video tape recorders (hereinafter referred to as VTRs), which are cassette-type magnetic recording and reproducing devices, in order to attach a tape horizontally pulled out from a cassette to a rotating cylinder on which a magnetic head is mounted. Using a leading guide provided on the loading ring and a plurality of guides provided on the substrate, the loading ring is rotated and wound around the outer periphery of the rotating cylinder at an angle to the axial direction.

On the other hand, in recent years, the diameter of the loading ring has become smaller as VTRs have become smaller. This slant ensures that the heights of the leading guide and tape match at the position where the tape pulled out horizontally from the cassette and the leading guide provided on the loading ring first come into contact with each other as the loading ring rotates. Otherwise, the leading guide will be lower than the tape. As a result, there is a problem in that the upper edge of the tape protrudes from the upper end of the leading guide, causing wrinkles to occur in the tape and possibly damaging the tape.

To solve this problem, during loading, before the loading ring rotates and the leading guide contacts the tape, the leading guide is raised to match the height of the horizontally drawn tape, and then A guide height changing mechanism has been proposed in which the leading guide is brought into contact with the leading guide, and then the height of the leading guide is gradually lowered to guide the tape to the height position at which recording and reproduction are actually performed.

FIG. 10 shows the main parts of a schematic configuration of a conventional guide height changing mechanism. An arm 102 is placed on the loading ring 101.
The arm 102 is provided so as to be movable in the vertical direction.
A leading guide (not shown) is placed on top. Further, the arm 102 has a cylindrical guide pin 1 extending in a substantially horizontal direction.
03 is fixed. On the other hand, loading ring 10
1 and the guide pin 103, the lower end is a substrate 104.
A guide plate 1 which is a substantially arc-shaped guide member fixed on the top.
05 is provided along the inner circumference of the loading ring 101. Further, a guide surface 105a having a curved surface of a predetermined shape is formed at the upper end of the guide plate 105, and a guide pin 103 is in contact with the guide surface 105a. Then, as the loading ring 101 rotates, the arm 102 provided on the loading ring 101 moves up and down, and the leading guide placed on the arm 102 also moves up and down to match the height of the tape and then starts guiding the tape. .

However, according to the conventional guide height changing mechanism configured as described above, the guide pin 103 is fixed to the arm 102 and the guide plate 105 is fixed to the substrate 104. Therefore, the position and amount by which the leading guide rises is determined by the processing accuracy and mounting accuracy of the guide plate 105. The position and amount are also affected by the movement of other guides during the loading operation, the assembly precision of the leading guide, and the tape tension during loading. Therefore, it is difficult to raise the leading guide to an appropriate height, and there is a problem in that the guide plate 105 must be remade in order to adjust this height.

(Problems to be Solved by the Invention) As described above, according to the conventional magnetic tape guide height adjustment device, the leading guide, which is vertically movably attached to the loading ring via the arm, is connected to the guide plate fixed to the substrate. Since the leading guide was moved up and down by contact with a guide pin fixed to the arm, it was difficult to raise the leading guide to an appropriate height. There was a problem in that the guide plate had to be remade in order to adjust the height of the mana.

The present invention has been made in view of these points, and an object of the present invention is to provide a magnetic tape guide height adjusting device of a simple structure that can easily adjust the height of a leading guide.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention includes a rotating cylinder on which a magnetic head is mounted, and a rotating cylinder rotatably disposed around the outer periphery of the rotating cylinder. a loading ring; a leading guide that is attached to the loading ring so as to be movable up and down via a support member and guides the magnetic tape pulled out from the cassette so as to attach it to the outer periphery of the rotating cylinder; a guide member having a guide surface of a predetermined shape on an upper surface provided on the support member, and a guide pin provided on the support member and abutting on the guide surface of the guide member; A magnetic tape guide height adjustment device for a magnetic recording/reproducing device that moves up and down while being guided by the guide member via the guide tongue, the height adjustment device comprising: One of the guide pins is formed to be inclined with respect to the axial direction of the guide pin, and a contact point 1 between the guide surface and the guide pin is movable in the axial direction of the guide pin.

(Function) According to the above configuration, at least one of the guide surface of the guide member and the outer circumferential surface of the guide pin is inclined with respect to the axial direction of the guide pin. By this movement, the leading guide can be moved in a direction perpendicular to the axial direction via the arm to which the guide pin is fixed. As a result, the height of the leading guide can be adjusted easily and accurately, and the magnetic tape can be quickly and easily pulled out from the cassette without damaging it.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

An embodiment of the present invention is shown in FIGS. 1 to 4.

FIG. 2 is a plan view showing a VTR to which this embodiment is applied.

A cassette 2 is mounted on the front part of the board 1 (lower part in the figure) at the position shown in the figure by a cassette mounting mechanism (not shown). A supply reel 3, a take-up reel 4, and a tape 5 mounted between the reels 3 and 4 are built into the cassette/soto 2. At this time, the cassette 2 is positioned with respect to the substrate 1 by a cassette/sort positioning device (not shown), and the supply reel 3 and take-up reel 4 are coupled to a reel drive mechanism (not shown). Furthermore, the tape 5 wound around the supply reel 3
is guided by a guide guide provided in the cassette 2, passes through an opening 7 formed in the cassette 2 with the magnetic surface facing outward, and is guided by a guide guide 8 provided in the cassette 2 to take up the take-up reel. It is wound up in 4.

On the other hand, the guides 9a, 10a, and 11a are rotatably attached to the tips of arms 9c, 10c, and 11c, which are rotatably supported on the substrate 1 via fulcrums 9b, 10b, and llb, respectively. Further, a slider guide rail 12 is provided on the horizontal plane 1a at the center of the right side of the board 1 in the figure, and the slider 13 is guided by a guide groove 12a formed in the slider guide rail 12 and is movable. ing.

Furthermore, a vertical post 14 and an inclined post 15 are provided upright on the slider 13.

Then, when the cassette 2 is inserted from a cassette insertion port (not shown) of the VTR, lowered by a cassette mounting mechanism (not shown), and mounted at the position shown in FIG. The inclined posts 15 each enter the space between the opening 7 of the cassette 2 and the tape 5.

A lower fixed cylinder and an upper rotating cylinder 16 (not shown) are coaxially provided on the upper inclined surface 1b of the substrate 1 in the figure, and the rotating cylinder 16 is rotatably supported with respect to the fixed cylinder. Further, a magnetic head 17 is mounted on the lower part of the rotary cylinder 16, and the rotary cylinder 16
At the same time, it is rotated at high speed by a drive mechanism (not shown).

Furthermore, three ring guide rollers 1B and 19.20 are provided on the inclined surface 1b at positions outside the rotating cylinder 16, and the inner circumference of the loading ring 21 can be rotated by the ring guide rollers 18, 19, and 20. is supported by Further, two tape guide rollers 21 and 22 are provided on the loading ring 21, and two tape guide rollers 23 and 24 and a voice control head 25 are provided on the inclined surface 1b within the inner circumference of the loading ring 21. It is set up.

Further, on the loading ring 21, as shown in FIG. 3, an arm attachment part 27 is fixed with a screw 26, and the base end of an arm 29 is rotatable at the tip of the arm attachment part 27 via a rotation pin 28. Possibly installed. Further, a leading guide 30 is rotatably supported at the tip of the arm 29, and a guide pin 31 is implanted in the side surface of the intermediate portion of the arm 29 in a substantially horizontal direction. Further, the rotation pin 28 is provided with a coil spring 32, which urges the arm 29 to rotate in the direction shown by arrow A. As shown in FIG. 1, the guide pin 31 has a conical shape with an axially inclined outer circumferential surface so that the diameter decreases toward the tip.

On the other hand, a guide plate 33 serving as a guide member is attached along the inner circumference of the loading ring 21 on the inclined surface 1b. As shown in FIG. 4, the guide plate 33 has a substantially arcuate shape, and two mounting portions 33a are integrally provided at the lower end. In addition, each of the mounting portions 33a has a long hole 33b.
is formed, and the guide plate 33 is fixed to the inclined surface 1b by inserting screws (not shown) into the elongated holes 33b. Further, a guide surface 33c formed in a predetermined curved line is provided on the upper end surface of the guide plate 33, and when the loading knife 21 rotates, the outer periphery of the guide pin 31 implanted in the arm 29 is It comes into contact with the guide surface 33c. Therefore, the guide plate 33 is moved along the elongated hole 33b as shown by the arrow B in FIG.
By moving in the direction shown, the heights of the arm 29 and the leading guide 30 can be changed. Note that the cross section of the guide surface 33c has a slope that matches the slope of the outer periphery of the guide pin 31.

In addition, the reference numeral 34 shown in FIG. 2 is a capstan, and the reference numeral 35 is a capstan.
Reference numeral 36 indicates an erasing head, and reference numeral 36 indicates a tension lever.

The operation of this embodiment will be explained below with reference to FIGS. 1 to 7. The guides 9a, 10a, lla and the slider 13 are moved to the second position by a loading drive mechanism (not shown).
Rotate from the position shown in the figure to the position shown in Figure 5, and
5 from the cassette 2 horizontally. Next, the loading ring 21 starts rotating counterclockwise from the position shown in FIG. 2 by a loading link drive mechanism (not shown). At this time, since the loading ring 21 is provided parallel to the inclined surface 1b, the leading guide 30 is attached to the loading ring 21 via the arm attachment part 27 and the arm 29, and the sixth guide is attached to the inclined surface 1b. The pinch roller 37 shown in the figure passes under the tape 5 between the guide 9a shown in FIG. 5 and the erasing head 35 without contacting the tape 5, and reaches the position shown in FIG. do.

When the loading ring 21 is in the position shown in FIG. 2, the arm 29 rotates in the direction shown by arrow A by the biasing force of the coil spring 32, as shown in FIG. They are positioned in abutment. The loading ring 21 is at the position t'''C'''C'' shown in FIG.
The guide pin 31 installed on the rotating arm 29 rides on the guide surface 33c on the upper end surface of the guide plate 33. As a result, the arm 29 rotates counterclockwise as shown in FIG. 3, and the height of the leading guide 30 changes. After the leading guide 30 hooks the tape 5 between the rotary cylinder 16 and the vertical post 14, it is guided by the guide surface 33c and gradually returns to the position shown in FIG.
guide it to a height suitable for winding.

The loading ring 21 further rotates counterclockwise,
When the position shown in FIG. 6 is reached, this position is detected by a loading position detection device (not shown), and the rotation of the loading ring 21 is stopped.

The chi 15 is connected to a rotary cylinder 16 as shown in FIG.
is wound around the outer circumference of the tape and guided to the tape running position. At this position, the pinch roller 37 is pressed against the capstan 34 side by a pinch roller pressing mechanism (not shown), and the tape 5 held therebetween is driven to travel by rotation of the pinch roller 37.

Further, as shown in FIG. 1, the outer periphery of the guide pin 31 is conical, and the guide surface 33 on the upper end surface of the guide plate 33
Since c also has an oblique cross-sectional shape, by moving guide plate 33 in the direction shown by arrow B, the height of arm 29 can be changed by C.

According to this embodiment, when the tape 5 is wound and loaded onto the rotary cylinder 16, the height of the leading guide 30 is easily adjusted via the arm 29 by moving the guide plate 33 in the axial direction of the guide pin 31. can be adjusted with high precision. Therefore, the height of the leading guide 30 can be easily adjusted to the appropriate height when attaching the tape without replacing the guide plate 33.

As a result, the tape drawing operation can be performed smoothly and quickly without damaging the tape.

In the above embodiment, the guide pin 31 is fixed to the arm 29, but as shown in FIG.
The rotating shaft 40 may be fixed substantially horizontally to the side surface of the rotating shaft 9, and the conical guide pin 41 may be rotatably attached to the rotating shaft 40.

Furthermore, as shown in FIG. 9, a plurality of attachment parts 33a at the lower end of the guide plate 33 may be provided so that fine adjustment of the height at each position can be performed independently.

Furthermore, the guide pin 31 may be formed of a plate member having an inclined surface. Further, only one of the guide pin 31 and the guide plate 33 may be provided with a slope. Further, the shape of the mounting hole 33a of the guide plate 33 is not limited to that shown in this embodiment.

[Effects of the Invention] As explained above, according to the present invention, a slope is formed on at least one of the guide surface of the guide member that adjusts the height of the leading guide and the outer peripheral surface of the guide pin, so that the guide member Since the height of the leading guide is adjusted by moving the leading guide, the height of the leading guide can be easily and accurately adjusted to the height when the tape is attached. As a result, the tape can be pulled out from the cassette smoothly and quickly.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the relationship between an arm and a guide plate according to an embodiment of the present invention, FIG. 2 is a plan view showing a schematic configuration of a VTR to which this embodiment is applied, and FIG. 3 is a similar leading guide. , a side view showing the arm and the mounting part, FIG. 4 is a plan view showing the guide plate, FIGS. 5, 6, and 7 are explanatory diagrams showing the operation of this embodiment, and FIG. FIG. 9 is a sectional view showing a guide pin according to another embodiment of the invention, FIG. 9 is a plan view also showing a guide plate, and FIG. 10 is a sectional view showing the relationship between a conventional arm and a guide plate. 1... Board 2... Cassette 5... Tape 16... Rotating cylinder 17... Magnetic head 21... Loading ring 29...
Arm (support member) 30... Leading guide 31... Guide pin 33
...Guide plate (guiding member) 33c...Guidance surface agent Patent attorney Norihiro Chika Hiroshi Uji Figure 4 Figure 2 Figure 6 Figure 7 Figure 8 layer

Claims (1)

[Claims] A rotating cylinder on which a magnetic head is mounted, a loading ring rotatably disposed around the outer periphery of the rotating cylinder, and a magnetic head that is attached to the loading ring so as to be movable up and down via a support member, and that is pulled out from a cassette. a leading guide that guides the tape and attaches it to the outer periphery of the rotary cylinder; a guide member that is provided close to the loading ring and has a guide surface of a predetermined shape on its upper surface;
A magnetic recording device comprising: a guide pin provided on the support member and abutting on a guide surface of the guide member; and when the loading ring rotates, the leading guide is guided by the guide member via the guide pin and moves up and down. A magnetic tape guide height adjustment device for a playback device, wherein at least one of the guide surface of the guide member and the outer peripheral surface of the guide pin,
A magnetic tape guide height adjusting device, characterized in that the magnetic tape guide height adjusting device is formed to be inclined with respect to the axial direction of the guide pin, and a contact position between the guide surface and the guide pin can be moved in the axial direction of the guide pin. .