JPH03225662A - Magnetic tape loader - Google Patents

Abstract

PURPOSE:To improve the stability performance of traveling a tape by connecting integrally a drum with guide post members via a base member, keeping their relative positions always constant and improving the positioning accuracy accordingly. CONSTITUTION:The drum 2c is loaded integrally with the base member 3, and the member 3 is rotated by the magnetic tape 7 in the direction of an arrow C. This member 3 is loaded with the guide post members 4 and 5 on the inlet side and the guide post member 9 on the outlet side, and the member 3 is interposed between the drum 2c and the members 4, 5 and 9. Then, the relative positions between the drum 2c and the members 4, 5 and 9 are always kept constant, and even at the time of loading and unloading operations, the problem of positioning reproducibility of the members 4, 5 and 9 and degradation of the positioning accuracy due to the change with the lapse of time can be dissolved. By this method, the positioning accuracy is improved, and the traveling of the tape 7 can always be stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a tape loading device in a magnetic recording/reproducing device.

[Prior Art] Generally, in video tape recorders (VTR), digital audio tape recorders (DAT), etc.
A magnetic tape loading device is used to wind a portion of a magnetic tape taken out from a tape cassette having two parallel reel members onto a drum of a rotating magnetic head device.

Generally, this type of loading device includes a block-shaped member called a loading base or slider,
The block-shaped member is provided with a guide post.

Further, the loading device performs the operation of winding a part of the magnetic tape around the drum of the rotating magnetic head device, that is, the loading operation, by moving the block-shaped member on a guide rail provided around the drum, and then This is done by fixing it in a predetermined position.

In such a magnetic tape loading device,
The movement of the block-shaped member such as the loading base,
This is done by a driving means equipped with an arm, links, and an annular member called a loading ring.

In the magnetic tape loading device described above, the means for fixing the block-shaped member such as the loading base in a predetermined position is to apply a pressing force by bringing the block-shaped member into contact with a stop member called a catcher or a stopper. The device is configured to be energized.

A magnetic tape loading device configured to load a magnetic tape onto the drum using a block member such as a loading base and an annular member such as a loading ring is disclosed in, for example, Japanese Patent Laid-Open No. -1!11363.

[Problems to be Solved by the Invention] Generally, when winding a magnetic tape around a drum of a rotary head device, guides on the upstream side and downstream side in the traveling direction of the magnetic tape are arranged close to the drum. Since the running condition of the magnetic tape changes greatly depending on the positioning accuracy of the posts, improving the positioning accuracy of the guide posts is a very important element in order to improve the running stability of the magnetic tape.

Particularly, when the angle at which the magnetic tape is wound around the guide post is large, for example, 30 degrees or more, the influence on various performances of the magnetic tape, such as track linearity characteristics and head touch characteristics, becomes even greater.

In addition, in the case of camera-integrated VTR devices, there is a tendency to make the diameter of the drum even smaller in order to miniaturize the device, so in order to maintain tape format compatibility, the magnetic tape is wound around the drum. There is a demand for an even larger angle.

Therefore, the winding angle of the magnetic tape around the loading post must necessarily be large, and therefore, even in the case of a camera-integrated VTR device, etc., it is necessary to further improve the positioning accuracy of the guide post described above. There is.

However, in the conventional magnetic tape loading device described above, a predetermined pressing force is applied to a stop member called a catcher or stopper in order to move a block-shaped member such as a loading base on a guide rail and fix it in a predetermined position. Since the magnetic tape is urged into contact with the drum, it is difficult to improve the positioning accuracy of the guide post mounted on the block-shaped member for winding the magnetic tape around the drum.

Furthermore, in the conventional magnetic tape loading device, the position of the guide post is different each time the loading operation is performed, that is, the position reproducibility of the guide post is poor, and as the loading operation is repeated, the position of the guide post is different. Another drawback is that the positioning accuracy gradually decreases and the durability against changes over time is poor.

The present invention has been made in view of the above points, and its purpose is to wind a tape around a drum of a rotary head device during an operation, that is, a loading operation, in which the tape is placed close to the drum. An object of the present invention is to provide a magnetic tape loading device that can improve tape running stability by improving the positioning accuracy of upstream and downstream guide posts with respect to the tape traveling direction.

[Means for Solving the Problems] According to the present invention, the object is to provide a tape loading device that pulls out a tape from a tape cassette mounted at a predetermined position and winds the pulled out tape around a drum of a rotary head device at a predetermined angle. The device includes a base member, a drum integrally attached to the base member, and at least one guide post member, and by rotating the base member, the base member and the guide post member are rotated. The winding of the tape onto the drum is accomplished by a magnetic tape loading device characterized in that it is configured to act in conjunction with the winding of the tape onto the drum.

[Function] From the above-mentioned structure, the magnetic tape loading device according to the present invention has the drum and the guide post member integrally connected via the base member, so that the magnetic tape loading device according to the present invention can easily operate during the loading operation and the unloading operation. The relative position between the drum and the guide post member can be kept constant at all times.

[Embodiment] Hereinafter, an embodiment of a magnetic tape loading device according to the present invention will be described based on the drawings.

1, 2, and 3 are plan views showing a series of states in a tape loading operation of a magnetic tape loading device according to the present invention.

It should be noted that FIG. 3 is shown in an enlarged scale for the sake of explanation.

FIG. 4 shows a series of tape loading operations of the magnetic tape loading device shown in FIG. 1, FIG. 5 in FIG. 2, and FIG. 6 in the direction of arrow A, respectively. FIG.

In each of these figures, 1 is a chassis, 2 is a rotary magnetic head device, 3 is a base member integrally attached to the rotary magnetic head device 2, and 4 is an inlet side nozzle integrally attached to the base member 3. 1 is a guide post member, 5 is a base member 3
6 is a loading tilted post member that moves to contact the magnetic tape 7, which will be described later; 8 is a loading vertical post member that moves to contact the magnetic tape 7; , 8a is a vertical post member that contacts and guides the magnetic tape 7 together with the rodding vertical post member 8, 9 is a guide post member on the exit side that is integrally attached to the base member 3, 10 is a capstan member, and 11 is a cap A pinch roller member 12 is configured to contact the capstan member 0 in a pressure-bonding manner while sandwiching the magnetic tape 7 between the pinch roller member 12 and the stun member 10 so as to transport and drive the magnetic tape 7. A loading vertical post member 13 moves to contact the magnetic tape 7 in the same manner as the loading vertical post member 8, and a pair of reel members 14 and 15 for feeding and winding the magnetic tape 7. Each of the equipped cassette cases is shown.

The rotating magnetic head device 2, for example, as shown in FIG.
In FIG. 6, a drum is attached to a rotating shaft 2a, which is an example of a support member, and is arranged to be inclined at an angle γ with respect to the perpendicular Z-axis so that the head can rotate around the rotating shaft 2a. It has 2C.

Each of FIGS. 1 and 4 shows an unloading state in which all of the magnetic tape 7 is stored inside the cassette case 13.

In such an unloading state, inside the cassette mouth 13a of the cassette case 13, there are the first guide post member 4 on the entrance side, the second guide post member 5 on the entrance side, the loading inclined post member 6, and the loading vertical post member 4. A post member 8, a pinch roller member 11, and a loading vertical post member 12 are each disposed.

In order to go from the unloading state of the magnetic tape 7 shown in FIGS. 1 and 4 to the completed loading state of the magnetic tape 7 shown in FIGS. 3 and 6, it is necessary to The base member 3 on which the first guide post member 4, the second guide post member 5 on the entrance side, and the guide post member 9 on the exit side are integrally attached is indicated by arrow C.
It is necessary to rotate it clockwise as indicated by .

2 and 5 each show the progress of the loading operation of the magnetic tape 7. As shown in FIG.

3 and 6 each show a state in which the loading operation of the magnetic tape 7 is completed.

In such a loading operation of the magnetic tape 7, the loading inclined post member 6 located on the entrance side of the magnetic tape 7 moves in the direction shown by the arrow 16, and the loading vertical post member 8 located on the entrance side of the magnetic tape 7 moves in the direction shown by the arrow 16. 17, the pinch roller member 11 in the direction shown by arrow 18, and the loading vertical post member 12 on the exit side of the magnetic tape 7 in the direction shown by arrow 19, e.g. Configured drive (not shown)
The loading operation of the magnetic tape 7 is completed by the combination of this moving operation and the above-described rotational operation of the base member 3.

When the loading operation of the magnetic tape 7 is completed, the pinch roller member 11 presses the magnetic tape 7 against the capstan member IO, as shown in FIG. 3.

In this state in which the pinch roller member 11 presses the magnetic tape 7 against the capstan member lO, the magnetic tape 7 can be recorded and reproduced by the rotary magnetic head device 2 for the first time.

In addition, when performing the above-described loading operation of the magnetic tape 7, in order to stably transport and move the magnetic tape 7, in other words, to obtain ideal tape running, a first guide post member 4 on the entrance side, The respective arrangements of the second guide post member 5 and the loading inclined post member 6 must be set as follows.

For example, in the case of the above-mentioned embodiment, as shown in FIGS. 3 and 6, the diameter of the drum 2C is D1, the still angle of the drum 2c is α, and the winding of the magnetic tape 7 around the drum 2c is at an angle. (degrees) is β, the inclination angle (degrees) of the rotating shaft 2a that rotatably supports the drum 2C is γ, and the rotation angle (degrees) of the drum 2c is θ. 4 and the unit direction vector (j!, m. of the second guide post member 5 on the inlet side).

n) is expressed as follows.

, g=sin α−5in β self cos θ
+5ina-cosβ・CO8γ・Sinθ+CO8α
・5in7eSinθ m=5inα・sinβ・SiH6 −5ina・cosβ"cos7'cosθ−CO8α
・Sinγ@CO8θ n=5inα-cosβ@5in7 10COSα'cos7 Furthermore, as shown in FIG. must be placed near the

Incidentally, assuming that the x and y coordinates are set as shown in FIG. 3, the virtual line 20 is expressed as follows.

lx +my =Il ・PI +m@P1 +n @
P! However, each of Pz, PY, and PI is the coordinate of the entrance part P (FIG. 3) of the magnetic tape 7 into the drum 2c.

These Px, P7. Each of the PIs is expressed as follows.

PI=D/2(cosβ*cosθ−sinβ・
CO8γ・Sinθ +β@tanα@5in7*sinθ)Py =D/2
(cosβ*sinθ+sinβ"cosγ・c
osθ -βIItanα・Sinγ@CO8θ)PI =D/
2 (s inβ・Sinγ+βIItanα1ICO
8γ) Furthermore, if the winding angle of the magnetic tape 7 around the loading inclined post member 6 in FIG. 3 is λ, then the inclination angle ω of the loading inclined post member 6 as shown in FIG.
is expressed as follows.

cosω= (n-cosλ)/(1-cosλ) In addition, when rotating the base member 3 described above in the clockwise direction indicated by arrow C, in other words, in each state before and after rotation of the base member 3, In order to reduce as much as possible the height deviation of the magnetic tape 7 seen from the input direction before and after the loading operation, the base member 3 is connected to the rotating shaft 2a of the drum 2c as shown in FIG. are different, and the rotation axis 3a is rotated around a rotation axis 3a whose inclination angle is set to approximately ψ.

In addition, the inclination angle ψ is under the following conditions, tanψ=　Pz　/　D Set to satisfy.

In order to further reduce the size of the magnetic tape loading device of the above-described embodiment, as shown in FIG. They may be brought closer together.

In another embodiment, the inclination angles of the rotating shaft 2a of the drum 2c and the rotating shaft 3a of the base member 3 are made to match γ, for example, as shown in FIG.

In this alternative embodiment, the magnetic tape 7 of the drum 2c
In order to eliminate twisting of the magnetic tape 7 that may occur during the loading operation due to a change in the height position of the lead portion 2b (FIG. 6) and a change in the inclination angle γ of the drum 2C, the drum 2c and the base member 3 are rotated, and the drum 2C and the base member 3 are rotated.
It may be configured to move each of them along the axial direction of the rotating shaft 2a.

In other words, each movement of the drum 2c and the base member 3,
This can be done using a helical spline structure 21 provided between the rotating shaft 2a, the base member 3, and the chassis 1.

Incidentally, the pitch p of the helical spline structure 21 is made to match the pitch of the leads of the drum 2c. That is, p=π−D
It is preferable to set @tanα and select the number of lines as necessary.

As described above, in any of the embodiments described above, when loading is completed, the magnetic tape 7 is not twisted between the guide post members, and the running plane of the magnetic tape 7 is referenced at the entrance/exit of the magnetic tape 7 of the cassette case 13. to match the plane 21 and the cassette case 13
It is necessary to align the height positions of the magnetic tape 7 at the entrance and exit of the magnetic tape 7 to form an ideal tape path.

In each of the above-mentioned embodiments, two guide post members are provided on the inlet side of the base member 3, and one guide post member is provided on the outlet side of the base member 3. A magnetic tape loading device in which various numbers of guide post members are combined in various ways, and a drum 2.
It will be readily understood that the configuration of the present invention can also be applied to a magnetic tape loading device in which the magnetic tape 7 is wound around the magnetic tape 7 at various angles.

Further, it goes without saying that devices for adjusting the position, inclination, and height of the guide post member may be provided on the base member 3.

[Effects of the Invention] From the above configuration, in the magnetic tape loading device of the present invention, since the drum and the guide post member are integrally connected via the base member, In either case, the relative position between the drum and the guide post member can always be kept constant. Therefore, both during loading and unloading operations, it is possible to eliminate the aforementioned positional repeatability of the guidebost member and the deterioration of positional accuracy due to changes over time, and it is possible to eliminate the deterioration of the positional accuracy due to changes over time, and to maintain a series of positions of the guidebost member on the base member. By making adjustments in advance, tape running can always be stabilized.

In addition, since a series of guide post members etc. are arranged on the base member, large and complex parts such as loading bases and loading rings can be omitted, making it easy to downsize the device and reduce the number of parts. obtain.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1, FIG. 2, and FIG. 3 are plan views showing a series of tape loading operations in an embodiment of a magnetic tape loading device according to the present invention, and FIG. is a front view showing a series of tape loading operations of the magnetic tape loading device shown in FIG. 1, FIG. 5 is in FIG. 2, and FIG. 6 is in FIG. 3, and FIG. 8 is a plan view showing another embodiment of the magnetic tape loading device according to the present invention, and FIG. 9 is an explanatory diagram illustrating the arrangement direction of the rotating shaft of the base member. FIG. 9 is a plan view showing another embodiment of the magnetic tape loading device according to the present invention. It is an explanatory view of another example of. 2...Rotating magnetic head device, 2a...
Head rotating shaft, 2C...Drum, 21...
...Helical spline structure, 3...Base member, 4. 5. 9...Guide boss member, 6
...Loading inclined boss member, 7...
...Magnetic tape, 8...Loading vertical boss member, 10...Capstan member, 11...
...Pinch roller member, 13...Cassette case. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] A tape loading device that pulls out a tape from a tape cassette mounted at a predetermined position and wraps the drawn tape around a drum of a rotating head device at a predetermined angle, the tape loading device comprising a base member and a drum integrally mounted to the base member. and at least one guide post member, and is configured such that by rotating the base member, the base member and the guide post member cooperate to wind the tape around the drum. A magnetic tape loading device characterized by: