JPH0221452A - Tape guiding device - Google Patents

Abstract

PURPOSE:To obtain tape feed with high accuracy and high stability by providing a cylindrical guide member to guide a tape by winding obliquely, a flange member, a guide member to guide the cylindrical guide member in an axial direction, and a stopper member to prevent rotation. CONSTITUTION:The title device consists of the cylindrical guide member 17 to guide the tape 15 by winding obliquely, the flange member 23 provided on the upper end of the cylindrical guide member 17 and is provided with a flat plane inclined for a core by a prescribed quantity, the guide member 25 to guide the cylindrical member 17 in the axial direction, and the stopper member 29 to prevent the cylindrical guide member 17 from being rotated. And the feed of a magnetic tape 15 can be regulated by the flat flange 23 provided on the upper end and inclined by guiding the magnetic tape 15 inserted to and ejected from a tape guide drum by inclining by the prescribed quantity, and also, sliding the cylindrical guide member 17 only in the axial direction without rotating. In such a way, it is possible to obtain an inexpensive and strong regulation force.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to, for example, video tape recorders (VTRs).
and digital audio tape recorder (DAT)
The present invention relates to a tape guide device equipped with an inclined guide for correcting twisting of a tape such as the above.

2. Description of the Related Art A conventional inclined guide is disclosed in Japanese Patent Publication No. 59-46064. FIG. 10 shows a tape running path including an inclined guide used in a general VTR. After the magnetic tape 1 is pulled out from a supply reel (not shown), a full-width erase head (not shown) is shown. ) and is guided to the entry side guide roller 2. Then, the inclination of the tape is corrected by an inclination guide 3 on the entrance side, and the tape is guided to a tape guide drum 4 equipped with a video head (not shown).

The tape guide drum 4 is provided with a spiral glue 5. After the magnetic tape 1 is run stably along this lead 5, the tape is returned to its original state ( horizontal) and guided to the exit guide roller 7. The magnetic tape 1 folded back by the output guide roller 7 passes through an audio control head (not shown) and is guided to a drive mechanism such as a capstan (not shown). In addition, each inclined guide 3.6 on the entry side and exit side
is provided on a slide base 8.9, and this slide base 8.9 reciprocates between a cassette (not shown) and the tape guide drum 4 to load and unload the tape.

Further, the entry side guide roller 2 is provided with a flange 10.11, as shown in FIG. 11, to regulate the running height of the magnetic tape 1. This is also provided on the exit side guide roller 7. This method of providing the inclined guide 3.6 adjacent to the tape guide drum 4, keeping the front and rear tape running paths horizontal, and simplifying the structure of the mechanism is very effective.

In the conventional tape guide device configured as described above, in order to record and reproduce video signal tracks on the magnetic tape 1 with high precision and stability, the running of the magnetic tape 1 running on the tape guide drum 4 must be stabilized. must be done.

The means for this is the upper flange 1 of the entry side guide roller 2.
A method is used in which the magnetic tape 1 is lightly pressed against the lead 5 of the tape guide drum 4 by the upper flange (not shown) of the output guide roller 7. In order to make the running of the magnetic tape 1 more stable while running on the tape guide drum 4, an inclined guide 1 is used as shown in FIG.
A method in which spiral flanges 13 and 14 are provided on the 2nd and 2nd sides of the slanted guide section provides stronger tape control (Utility Model No. 59-
42552).

Problem to be Solved by the Invention However, in the above configuration, since the inclined guide 3.6 is disposed between the tape guide drum 4 and the entrance or exit side guide roller 2.7, the tape guide drum 4, the distance from the entrance guide roller 2 or the exit guide roller 7 becomes longer, and the magnetic tape 1
The force pressing down on the reed 5 is reduced, and the regulating force is weakened. As a result, the magnetic tape 1 tends to meander along the tape guide drum 4, making it impossible to record and reproduce good video tracks. In addition, in order to obtain strong regulatory power,
If an attempt is made to strengthen the pressing force of the output guide rollers 2.7, there is a risk of damaging the tape edges of the magnetic tape 1, and this problem becomes particularly serious with thin magnetic tapes. On the other hand, the method shown in Figure 12 provides a stronger regulating force than the former, but since the inclined guide is generally made of stainless steel and requires fine surface roughness, the outer peripheral surface must be ground. Moreover, it is extremely difficult to process the spiral flange at the same time by grinding, resulting in a significant increase in cost.

The present invention solves the above conventional problems and is inexpensive.
Moreover, it is an object of the present invention to provide a tape guide device that can obtain a strong regulating force.

Means for Solving the Problems The present invention provides a cylindrical guide member for guiding a tape by winding it obliquely, a flange member provided at the upper end of the cylindrical guide member and having a plane inclined by a predetermined amount with respect to the axis;
a guide member that guides the cylindrical guide member in the axial direction;
The tape guide device includes a stopper member that prevents rotation of the cylindrical guide member.

Operation The present invention has the above-described structure, so that the tape guide drum can be operated by a person.
To guide the emitted magnetic tape by tilting it by a predetermined amount, and by sliding the cylindrical guide member only in the axial direction without rotating it, the running of the tape is regulated by an inclined planar flange provided at the upper end. I can do it.

Embodiment FIGS. 1(a) and 1(b) show a plan view and a sectional view of an entry tape guide device in an embodiment of the present invention. In FIG. 1, the magnetic tape 15 pulled out from the cassette (not shown) is wound around the entry side guide roller 16, and then
The tape is wound spirally around the entry side inclined guide 17 and guided to a tape guide drum (not shown). Here, the entry side guide roller 16 is rotatably held by a height-adjustable main shaft 18, and an upper flange 19 and a lower flange 20 fixed to the main shaft 18 are provided on both sides, respectively. The main shaft 18 is configured so that its height can be adjusted using a threaded portion 22 provided on the entry side slide base 21. In addition, the entry side inclined guide 17 and the flange 23 are
The entry-side inclined guide 17 is slidably held by a guide shaft 25 provided on the entry-side slide base 21, and the lower end is biased upward by a compression spring 26, and the upper end is urged upwardly by a compression spring 26. Height adjustment screw 27
It is configured so that the height can be adjusted. (Details of the tape edge regulating surface 32 shown here will be described later.) Furthermore, as shown in FIG. 2, the entry side inclined guide 17 is provided with a slit 28 at the bottom, into which a rotation prevention guide 29 is engaged. , the entry side inclined guide 17 is slidable only in the axial direction. Further, the entry side inclined guide 17 is inclined in a direction parallel to the 8 portions of the magnetic tape 15 stretched between the entry side inclined guide 17 and the entry side guide roller 16, and FIG. Unit magnetic tape 15 of 8
FIG.

Next, the configuration of the tape edge regulating surface 32 of the flange 23 will be explained. Figure 4 shows the magnetic tape 15 and flange 23.
The magnetic tape 15 begins to wrap around the entry side inclined guide 17 along a line 30, and after winding a predetermined amount in the diagonal direction, it leaves the line 31. Further, the tape edge regulating surface 32 of the flange 23 is inclined in one plane parallel to the 8th part of the magnetic tape 15 as shown in FIG. It is inclined so as to contact the upper end of the magnetic tape 16 at a position approximately in the middle of the start line 31 (line 33).

Next, the configuration on the output side will be explained. Figure 5(a).

(b) shows a plan view and a sectional view of the output tape guide device. In FIG. 5, the magnetic tape 15 that has come out of the tape guide drum (not shown) is spirally wound around the output side inclined guide 34, and then guided by the output side guide roller 35 to the audio control head (not shown). ). Here, the exit side inclined guide 34 and the flange 38 are integrated by being press-fitted into the connecting collar 36 on the entry side.

(Details of the tape edge regulating surface 37 will be described later)
The exit side inclined guide 34 is connected to the exit side slide base 39.
It is slidably held by a guide shaft 40 provided in the
The lower end is biased upward by a compression spring 41, and the upper end is brought into contact with a height adjustment screw 42 so that the height can be adjusted.

Further, the exit side inclined guide 34 is provided with a slit 43 on the lower side, similar to the entrance side, and the rotation prevention guide 44 is engaged with this slit 43, so that the exit side inclined guide 34 can slide only in the axial direction. In addition, the exit guide roller 35 has a height-adjustable main shaft 4.
5, and an upper flange 46 and a lower flange 47 fixed to the main shaft 45 are provided on both sides, respectively. The main shaft 45 is the exit side slide base 39
The height can be adjusted using a threaded portion 48 provided at the top.

Further, the output side inclined guide 34 is inclined in a direction parallel to the X portion of the magnetic tape 15 stretched between this inclined guide and the output side guide roller 35, and FIG. 5(b) shows the unit. FIG. 3 is a cross-sectional view of the magnetic tape 15 viewed from a direction perpendicular to the X section.

Next, the configuration of the tape edge regulating surface 37 of the flange 38 will be explained. Tape edge regulating surface 37 of flange 38
is 7 parallel to the two sides of the magnetic tape 15 as shown in FIG.
The magnetic tape 15 is inclined in the same manner as on the entry side so as to contact the upper end of the magnetic tape 15 at a position approximately midway between the tape winding start line and the tape unwinding start line. To further explain the tape edge regulating surfaces 32 and 37, the region where the regulating surface actually regulates the tape edge cannot obtain the regulating effect unless the tape is wrapped around the cylindrical guide, for example on the entry side. In this case, the range in which the regulating surface can be formed is from a position in contact with the upper end of the tape winding start line 30 shown in FIG. 8 to a position 32' in contact with the upper end of the separation start line 31 shown in FIG. However, when the tape is actually regulated, the edge deforms within its elastic range, and the edge comes into contact with the regulated surface over a wide range.For this reason, the tape edge regulated surface is as shown in Figure 4. It is preferable to configure the contact at the center of the winding range.

Further, the direction of inclination of the flanges 23.38 will be further explained. 1 and 5, the entrance side of the flanges 23 and 38 in the inclination direction is 8 parts of the magnetic tape 15,
The exit side was set to planes T and Y parallel to the two parts of the magnetic tape 15, respectively, but temporarily the entrance side and exit side flanges 23.
The inclination direction of 38 is shown in FIG. 1 and FIG.
When the magnetic tape 15 is set parallel to the entrance side, the magnetic tape 15 is wound around the entrance side inclined guide 17 and the exit side inclined guide 34.
For example, on the exit side, if a flange 38- is provided in parallel to the contact start line 39 side, rising from the contact start line 39 toward the separation start line 40 as shown in FIG. This structure is undesirable because it bites into the tape edge regulating surface 37' (shaded area), which may lead to damage to the tape edge. This also applies to the entrance side.

The operation of the tape guide device of this embodiment configured as described above will be described below. First, the magnetic tape 15 pulled out from a cassette (not shown) is wound around an entry side guide roller 16 to change its direction, and is wound around an entry side inclined guide 17 by a predetermined amount to cause a tape guide drum (not shown) to be tilted on the entry side. The magnetic tape 15 is corrected to the corner and travels to the tape guide drum, and after exiting the tape guide drum, the magnetic tape 15 is wound around the output side inclined guide 34 by a predetermined amount, and after the magnetic tape 15 is corrected to the tape surface in the cassette, the magnetic tape 15 is transferred to the output side guide roller 35.
It wraps around itself, is redirected, and travels to the audio control head and capstan (not shown). At this time, in order to stabilize the running of the magnetic tape on the tape guide drum section where video signal tracks are recorded and played back, the inclined guides 17.34 on the entrance and exit sides should be adjusted with height adjustment screws 27.34.
2, and lightly press the magnetic tape 15 against the lead of the tape guide drum with each tape edge regulating surface 32 and 37. Then, the inclined guides 1 on the entry side and exit side
7. Entry side and exit side guide rollers 16. adjacent to 34.
35 regulates the upper end of the tape for the purpose of dispersing the pressing force generated by the tape edge regulating surfaces 32 and 37. However, when using a highly rigid tape, the lower flanges 20.4 of the guide rollers 16.35 on the entry and exit sides
By configuring the magnetic tape 7 to restrict the lower end of the magnetic tape 15, the running from the guide roller to the tape guide drum can be further stabilized.

As described above, according to this embodiment, a flange member having a predetermined fully inclined plane is provided on the upper part of the cylindrical guide member that guides the tape by winding it diagonally, and a guide guide that guides the cylindrical guide member in the axial direction. By providing a stopper member for preventing rotation of the cylindrical guide member, tape running can be restricted by the inclined guide located between the tape guide drum and the guide roller.

It goes without saying that the inclined guide may be provided with a flange for regulating the lower end of the tape under similar conditions.

As described in detail, the present invention includes a cylindrical guide member that guides the tape by winding it diagonally, and a flat surface provided at the upper end of the cylindrical guide member and inclined by a predetermined amount with respect to the axis. By providing a flange member, a guide member that guides the cylindrical guide member in the axial direction, and a stopper member that prevents rotation of the cylindrical guide member, it is possible to reliably regulate tape running with the inclined guide, Highly accurate and highly stable tape running can be obtained. Further, by forming the flange with a flat surface, processing becomes extremely easy, and an inexpensive inclined guide can be realized, which has a great practical effect.

[Brief explanation of the drawing]

FIG. 1 is a plan view and a sectional view of an entrance tape guide device according to an embodiment of the present invention, FIG. 2 is a perspective view showing a rotation prevention mechanism of the embodiment, and FIG. 3 is a tape edge regulating surface of the embodiment. FIG. 4 is a side view showing the state of contact between the upper end of the tape and the tape edge regulating surface of the embodiment; FIG.
Figure 5 is a plan view and cross-sectional view of the exit tape guide device, and Figure 6 is a
The figure is a perspective view showing the inclination direction of the tape edge regulating surface of the same embodiment, FIG. 7 is a side view explaining the configuration conditions of the tape edge regulating surface, and FIG. 8Fg and $9 illustrate the limit configuration conditions of the tape edge regulating surface. A side view, FIG. 10 is a plan view of a conventional tape guide device, FIG. 11 is a side view of an inclined guide of a conventional tape guide device, and FIG. 12 is a side view of a second conventional inclined guide. It is. 15... Magnetic tape, 17... Entrance side inclined guide, 23... Flange, 25...
...Guide shaft, 29...Rotation prevention guide. Name of agent: Patent attorney Shigetaka Awano Figure 15 - Magnetic tape 17 -... Input 111 Tilting Keyboard Figure (a-2 Figure q)

Claims (1)

[Claims] a cylindrical guide member that guides the tape by winding it diagonally; a flange member that is integrally provided at at least one end of the cylindrical guide member and has a plane that is inclined by a predetermined amount with respect to the axis; A tape guide device comprising a guide member that guides in the axial direction and a stopper member that prevents rotation of the cylindrical guide member.