JPS5894162A - Tape automatic loader - Google Patents

Abstract

PURPOSE:To realize tape automatic loading in omega winding and to attain excellent tape running properties, by winding a tape on a drum at the final moving position where tape loading pole mechanisms are moved without being crossed with each other. CONSTITUTION:Tilted poles 32, 31 are positioned between a vertical pole 33 and a drum 12 and guide a tape to a drum inlet by correcting the height and direction of the tape at the drum inlet stepwise without being twisted between adjacent poles for the height and direction of the tape at the vertical pole 33. Further, tilted poles 35, 36 are positioned between the drum 12 and a vertical pole 37 and guide the tape to the position of the vertical pole 37 while correcting the height and direction of the tape at the position of the vertical pole 37 without twisting the height and direction of an outlet of the drum 12 between adjacent poles stepwise.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic scissor loading device, particularly in a device for pulling out a tape from a top tape cassette and wrapping it around a horse surface of a guide drum. As the configuration provided in this book,
Tape t around the guide drum 3...1 (where to wrap it)
An object of the present invention is to provide an automatic tape loading device that automatically loads a winding tape.

It is thought that in the future, video recording and reproducing devices (VTRs) will become smaller, lighter, and have higher image quality. For this purpose, it is necessary to reduce the diameter of the drum and rotate the drum (video head) at a correspondingly high speed.

Therefore, for example, the drum should be moved at twice the conventional speed (II@@r
If the tape is rotated at a speed of 3,600 pm) and the tape is wound around the drum for a g-wrap using a 1-head or TS head system, high-quality images can be reproduced.Moreover, the drum diameter can be made small, making it easier to use and reduce weight. I will actually be able to do 3J.

However, when trying to automatically perform ρ winding, there is a problem described below6.Currently, a pair of loading pole mechanisms (one slanted pole and one straight pole) move and roll the tape. It is configured to be loaded around the drum. The tilting pole is for absorbing the difference in the height of the tape at the entrance/exit side of the drum and also for absorbing the twisting that occurs in the tape. This is to control the position.

In this method, the tape is placed on a drum with a diameter of approximately 110"
There is no problem with winding the tape, but the tape is attached to the drum Kl@0
``If you try to wrap the tape close to it, the tape will not twist, and in order for the tape to maintain a certain height while running, at the loading completion position, the pole should be in the relationship shown in Figure 1 with respect to the drum. [F) The pole 1 is placed at a position beyond the Y axis passing through the center of the drum 2, and after the magnetic tape 3 has moved away from the drum 2, it is guided by the inclined pole 1, the tape twist is absorbed, and its direction is almost reversed. , is guided by the next vertical pole 4 and heads toward the cassette.In particular, the inclined poles on the tape inlet and outlet sides each move beyond the Y axis and intersect with each other in the plan view, making automatic tape loading impossible. It is possible to do this when the winding angle of 9 tags 3 on the inclined pole IK is 1.
If sG'@[is considerably large, the tape running friction resistance at this location is large), the tape running performance deteriorates.

The present invention solves the above problems and makes it possible to automatically load nine rolls of tape.One embodiment of the present invention will be described below with reference to the drawings.

FIG. 3 is a plan view showing the state before the tape is loaded in the embodiment, and FIG. 3 is a diagram showing the state after the tape is loaded.

In each figure, the tape automatic loading device 10 has a flat chassis 1.
1, a guide drum 12, a loading pole mechanism 13ζ on the drum entrance side, a loading pole mechanism 14 on the drum exit side, and the like are provided. The tape cassette 1s has a supply reel 1@ and a take-up reel 17 arranged side by side inside the tape cassette 1s, and is mounted with the front side facing the guide drum 12. With the cassette 15 installed, the loading pole mechanism IS#14, the auxiliary loading pole 18°1
s and the pinch roller 21 are inserted into the cassette 1sP38'C inside the loop of the magnetic tape 21.

The recording/reproducing operation operates the p1 tee loading mechanism (not shown), and the loading pole mechanism 13.14 is guided by the arcuate guide groove 22.2'4 on the chassis 11, respectively, and is guided by the arrow along the guide groove 22.2'4. Mmm.

The tape 21 is pulled out from the cassette IS and moved in the direction B to the position shown in FIG. Further, the auxiliary loading poles 18, 111 and the pinch roller 20 are each pulled out of the cassette and reach the operating position. As a result, the tape automatic loading device 10 is in the state shown in FIG. 360 to drum 12 between mechanisms 13 and 14
It is wound around 11, and recording and playback is performed by the video head in this part, which is further guided to the auxiliary loading pole 1s, and is connected to the audio and control head (not shown).
The cassette 15 is attached to the cassette 15, is gripped and driven by the pinch roller 20 and the capstan 24, runs in the direction of arrow 0, and enters the cassette 15 again.

Note that the loading pole mechanisms 13 and 14 have a structure with two inclined poles, as described later.This allows the position of the loading pole mechanisms 13 and 140 when loading is completed to be aligned with the Y axis (with respect to the center of the drum). This allows the position to be such that it does not cross the line passing through the center between both reels. As a result, the loading pole mechanism 13 operates only on the left side of the Y-axis on the chassis 11, and the loading pole mechanism 14 operates only on the right side of the Y-axis, and they do not cross each other. , automation of the tape loading operation is realized.

It should be noted that the loading pole mechanisms 1s and 14 are respectively moved in the direction of the arrow bar 2 in the opposite direction from the above-mentioned loading time. B, the unloading operation is performed by moving to the original position in direction B.

Next, the configuration of the loading pole mechanisms 13 and 14 will be explained with reference to FIG. 4 and FIG.

The drum entrance side loading pole mechanism 13 includes a first inclined pole 31, a second inclined pole 32, and a vertical pole 33 on a sliding base 3G that slides on the chassis 11.
This is a structure in which the trees are planted. The drum outlet side loading pole mechanism 14 also has first and second
Inclined pole 3s.

It has a structure in which S@ and vertical pole 3T are planted.

When the loading is completed, the magnetic tape 21 is at a higher position on the inlet side of the upper drum in the tape running direction than the standard height (the tape position in the cassette) and is facing downward with respect to a horizontal plane parallel to the chassis 11. The drum exit side is located at a lower position than the reference height and faces upwards relative to the horizontal plane. At the point where it is guided (by the vertical poles 33, 37), the magnetic tape 21 is at a reference height position and is oriented horizontally. Inclined pole $
2.31Fi, located between the vertical pole 33 and the drum 12, to adjust the height and orientation of the tape at the position of the vertical ball 33 to the height at the drum entrance without twisting the tape between adjacent poles. The purpose is to guide the tape to the drum entrance by making stepwise corrections in its direction and direction, and its inclination angle and direction are determined to achieve this purpose. Another tilted pole 3! , 3@ are located between the drum 12 and the vertical ball 3T to adjust the height and orientation of the tape at the outlet of the drum 12 by twisting the tape between adjacent poles (
The purpose is to guide the tape to the position of the vertical ball 8T by gradually correcting the height and direction at the position of the vertical ball 3T), and its inclination angle and direction are determined so as to achieve this purpose. Yes/Also, the first inclined poles 31 and 3
s also functions to restrict the adhesion angle of the magnetic tape 21 to the drum 12 at 2 degrees.

Here, in particular, the first tilted poles 31 and 35 do not compensate for the entire difference in tape height and direction, but only partially compensate for the difference. In the figure, the distance from the tape entrance position in the drum 12 to the first inclined pole $11 is 1, and the tape exit position P! Djl
The distance L1 to the inclined pole 3s of E1 can be made much shorter than in the case of only one inclined pole. As a result, the tape 21 is wound around the drum 12 for nearly 360 seconds by simply rotating the loading pole mechanisms 13, 1'4 within the angle range that does not intersect with each other as described above, and the g-wrap tape is automatically loaded. In addition, the tape 21 is twisted at the entrance and exit sides of the guide drum 120 in the sections between adjacent poles and in the sections between the first inclined poles st and ss and the drum 12. Since the tape is not damaged and the tape is run while the height and direction are corrected step by step, the tape runs stably. Furthermore, since the tape is sequentially guided by the three poles and makes a U-turn, the angle at which the tape wraps around each pole becomes smaller. This reduces the tape running load at the drum entrance and exit, and reduces tape tension, which is advantageous in terms of tape protection and tape running performance.

In addition, the Boers L'31 to 3 and the poles 35 to 38 are arranged close to each other, and the small base 38.
It is planted on 34. This is also advantageous in realizing automation of tape loading.

Next, the inclined pole 31. A calculation method for determining the inclination direction, inclination angle, position, and vertical pole 33°370 position of $5.32.31i will be explained with reference to FIG.

In the figure, the tilting pole and drum are shown in an upright position. What are the inclined poles and vertical poles on the inlet and outlet sides of the drum? Rounding is symmetrical with respect to the axis.The pole group on the tape exit side will be explained below.0 First, how to determine the inclination angle, direction, etc. of the inclined poles so that the tape runs stably without twisting in the section between adjacent poles. will be briefly explained.

First, in order to prevent the tape from twisting in the section between the drum 12 and the first inclined pole 3s, it is necessary to
can only be tilted in the tape movement direction (PcL direction) within the above section. In addition, in order to prevent the tape from twisting in the section between the first tilted pole 35 and the second tilted pole 36, the first tilted pole 3s is tilted only in the tape movement direction (TV direction) in the section. Can not. First, if the first tilting pole 3S is tilted by an angle ζ in the direction of P, then 29
Between 77 and 77, the tape will not twist, but between 77 and 77, the tape will twist. Therefore, in order to correct the twist between 77 and 77, the first tilted pole 35 tilted at an angle ζ in the P direction is moved along the I axis together with the drum 12. Tilt at a certain angle in the direction. Now, when the angle aμ is reached, the tape is tilted from the first tilted pole 35 to the vertical pole 37 via the second tilted pole 3-. However, if the reference plane is set at the midpoint B of the drum 12, the tape height will be zero after passing the second inclined pole 3@ and after the point W, and it must remain horizontal. Since the tape is wrapped around the second tilted pole 3@ at a certain angle, if this pole 36 is tilted in the W5 direction, the height of the tape after point W will change upward or downward, so during this time The second tilting pole 3@ is tilted in the WE direction until the tape becomes horizontal with zero height. As a result, it is assumed that the tape becomes horizontal at a height position of zero when the inclination angle is η2. Then, although the tape is not twisted between the second inclined pole 36 and the vertical pole sT,
Since the tape is twisted between the second inclined pole 36 and the first inclined pole 3s, the above-mentioned angle a.

The drum 12 and the first tilted pole 3s are tilted by ! It is sufficient to tilt it along the axis and adjust the tilting angle so that there is no twisting between the first and second tilting poles.

Incidentally, if you cannot untwist the tape, you can pull it by changing the distance t between the first and second inclined poles.

In this way, the tape runs stably without twisting.

Next, a method of calculating the inclination angle and direction of the inclination poles 3s, 3, and the distance t between the inclination poles will be explained.

The tape 21 passes the middle point 1m of the drum 12, leaves the drum 12 at point A, enters the first inclined pole 3s at point q, leaves this inclined pole ss at point T, and enters the first inclined pole 3s at point V. It is assumed that the ball touches the inclined pole 3@ of No. 2, moves away from the pole at point W, goes straight to the ball 3T, and touches the same pole at point E at a distance of 37 km.

Now, assuming that the drum and each pole are standing vertically, the coordinates of each of the above points are determined as follows.

P (AO, Bo, 0o) GL (Mu, ・B, ・a,) T (-mu 2 * B2x '2) U (mu Ha BHe C5> V (A4. B4.04) W (mu Hg "5t '5) S (Mu4m "4# '4) Next, the first tilting pole 34 is tilted by ζ in the PQ direction, and then along the I axis with the drum 12 in the -X direction at an angle f1°. The coordinates of each of the above points are determined as follows.

! ' (Xo, Yo, Zo) Q ("1s"1e zl) T (A2. Y,, A2) U (X,, Y,, Z,) V (A4. A4. A4) Also, the second slope As a result of tilting the pole 36 at an angle ζ2 in the direction of the first tilted pole 3s and subsequently tilting it at an angle A2 in the direction of drum tilt, the tape 21 is not twisted between the first and second tilted poles 35. Assuming that the vehicle continues to run horizontally at the zero height position after leaving the tilted pole 3@ of No. 2, the coordinates of points V and a at this time are expressed as follows.

W (A5. Y,, Z,) & (X,, !,, A6) Then, the coordinates after tilting are the three-dimensional l of the coordinates before tilting.
! It can be obtained by standard transformation. That is, if [] is a matrix and (-1L), [-β], [-ζ,] are each one-direction cosine, the new coordinates can be calculated using these (""
z)-('(Is Bos '6)[-'1)o'
am.

(” ” ” )”('1* Blt "IX-'
1) 1 #1 (X Y Z), (A B (1) [-ζ] [
-β,”](-a,)+(X, A2 glue 2# 2
2 glue 2s 2 1Y,・z,) ("1*"5s z5]-(mu5s "5e C5X
A,][-]β,X-&,+("1#"1* zl) C"4a Y4s "4E-C'4a 34m '4)
[I, -X-7,X-4,)l-("1* "1* z
l) C”5a YHa A5)-(”5.B5*C5)[
A,)(-/,X-42)+[A4. A4. z4] ("4#"6m "6]-C'6m"6106Xi,)C-72)[-A2)+("4s"4s A4) However, the above direction cosine is as follows.

Here, C1 is the Q of the first inclined pole 35, ? The inclination angle of the direction, β, is the drum wrapping angle of the tape, a,
represents the drum inclination angle. Further, the inclination angle of the ζμ second inclined pole 36 in the direction of the first inclined pole, β2 is the cylinder 2
The directional angle, toe, indicating the position of the tilting pole 36 in FIG.

Next, the meaning of each symbol is defined as follows, and the above symbol M is defined. , Bo, Oo... are expressed using specific symbols.

First, each symbol will be explained. All angles are in radians.

D Ni drum diameter α, Ni drum lead angle β; Tape drum winding is overlapping angle, t1 Tape contact point between Ni drum 12 and first inclined pole 35 □
Distance between (PQ) r, s r, : First and second inclined poles 35°3
Radius of 0, : Wrapping of the tape around the first tilted pole 3s is angular, : Tilt angle t2 of the tilted pole 3s of 11E1: Between the first tilted pole 35 and the second tilted pole 36 Distance between tape contacts (TV) 0: The tape is wrapped around the diagonal pole 36 @2 at an angle +72: Inclination angle of the second tilt pole β2: Directional angle indicating the position of the second tilt pole 30 (#,
−β, ). Incidentally, the lead of the drum 12 is formed so as to extend from the zero height position at the intermediate point B in a direction counterclockwise downward from this position.

Then, the coordinates of each point at the stage before tilting are expressed as follows.

Mu-o　o・β1 2 B, -2s i! 1/1 0°-17(7-β,)tanα.

tag-7001β, -4,co-α1°sinβ1731
m T@inβ1+t1Co−α1°cowβ10,
−−7(−+71)”nα, −4, sinα.

Next, regarding the first inclined pole 35, the auxiliary coordinates x1-Y,
If you set: MWr(1-Coso,) 1 Bmrsin# 2 1 1 Ow--r-a-tag.

2 1 1 M1-M2-1-r,・cot(e, -β,)”
sin'.

s s-x z + r 1・cot (#, -
β, )-eoa#.

Cr C2-r, ・Cot(01-β1)・tILnI
F1 mlm+l -qosy, -gln#.

4 2 2 n4m+-:52-4-12@oos11- oos
e104m O, -12-siny.

becomes.

Furthermore, the auxiliary coordinates x2-Y2 for the second tilted pole 36
When set, m error (1 + oo-02) 2 B m r -5in# 5 2 2 0s--r-#・tanη2 S 22 mrom 5 + r 2 ・cot (e 2 + β2
) ・s i nθ2B w B +r 5ot(
θ2+β2) 'OO"#β6 5 2 0 a-a s r 2 c o t(θ2+β2)
-tany2. The coordinates of each point after the tilt can be expressed using the coordinates of each point before the tilt expressed as described above.

Next, the conditions for stable tape running will be described.

(11 In order to prevent the tape from twisting in the section between the first tilted ball 3s and the second tilted ball 36, the drum tilt direction component of the first tilted ball 35 and the second tilted ball 3
Since it is sufficient that the components in the drum inclination direction of 6 are equal, &#&-1......■! 1 calculated as @ (2) The condition for the tape not to be twisted between the second inclined ball 36 and the vertical pole 37 is expressed by. X,
, X6. Y5. Y6 can be obtained by expanding the above matrix.

(3) The condition for the tape 21 to be horizontal between the second inclined ball 36 and the vertical pole 37 is that the tape leaving the point W on the second inclined ball S @ intersects the auxiliary coordinate Y2 axis. Assuming that the point is 8, it is sufficient that the two coordinates of point W and point 8 are equal, so it is calculated as 2 -2 ■O...■ 6 .

(4) Regarding the condition that the height of the tape away from the second inclined ball 3G takes a certain constant value (zero in this case) from the reference plane] In Figure 1, the z coordinate of point vt2) of the two parallel reels In the case of a tandem reel, it is zero, and in the case of a tandem reel, it is sufficient to take the value determined by the height difference between the two reels, so z, - constant...
...Calculated by ■.

Also, focusing on the first inclined ball 3S, the direction of inclination is r.
, then r is &1. β1. 3 as a function of ζ
It can be calculated by dimensional coordinate transformation, and similarly, the inclination angle da is cozy, -5inζ1a11nβ1#min&, -4
It can be calculated by -Coilζ, -oosal ---"'■.

Further, the distance t2 between the first inclined ball 35 and the second inclined ball 3I can be calculated by expanding the above equation 0 and solving for t2. That is, D1mr2(1Co-02)
elnal・cosβ2D2-r2sine2(eln
al・sinβ2-cowζ2-coaa2eainζ
2) ])3m r2-02tany2(elnal-sin
β2-81nζ2+cosa 1cogζ2) D4-elnal・l11nβ1eC011ζ, -co
mal・stnζ1D5-*5ina1-sinβ1・
t31nζ, +coea1・oosζ1D, D −D
-D+mu5ina -co8β1-B2・D4412
S 2 1 10 -D+Mu-11nlL 10, QOl & 125
1 11 D -5ina Naogβ ・cos+y -1
1n# -00Q1-7 1 1
1 1cos# -D -5iny
,-D.

4 given that J″7 becomes.

Thus, the first inclined ball 35 relative to the drum 12
the direction and angle of inclination, the position of the second inclined ball 3,
By determining the inclination direction, inclination angle, and position of the vertical pole 37 using the above formula, and correctly arranging the three poles accordingly, the tape 21 can be loaded without twisting in the section between the poles. The mechanism 14 can be run stably. Also, the first inclined ball 3 of the tape 21
Since the angles of the tape s and the second inclined ball 36 are kept small and approximately equal, the tape running load on the loading pole mechanism can be reduced, and load fluctuations can also be kept small.

Furthermore, the distance t2 between the first tilted pole 1S and the second tilted pole 36 can be calculated in any other way by selecting other constants. However, by reducing the distance t2, the sliding base 34 can be made smaller in size, thereby making it possible to downsize the tape loading mechanism.

The inclination angle, inclination direction, and position of the inclination pole, and the position of the vertical pole are summarized as follows.

The angle of inclination of the double drum 12 is a5 for the first inclined pole 3s, the angle of overlap of the corner is β1 for the tape winding on the drum, and the angle of inclination of the drum 12 is set at β1 in the direction along the tape between the first inclined pole and the drum. If the inclination angle of the inclination pole is ζ, the center of the first inclination pole 35 is located at a distance t from the drum contact point in the direction along the tape, and the reference line of the drum is Angle da in the direction determined by the angle γ5 with respect to the X axis.

η, -woos (sinζ, -5inβ, -5l
na, -oosζ, comal).

Regarding the second inclined pole 3@: Wrap the tape around the first inclined pole so that the corner is 0. is the angle β with respect to the drum reference line X-axis.

’2”’t-β.

distance t from the first tilted pole in the direction of .

However, 2. Height of tape from standard height D4. D:
When the center is located at the position of the variable that changes depending on each value, the inclination angle of the second inclination pole in the drum inclination direction is 12, and the inclination angle in the first inclination pole direction is ζ2, the reference of the drum is Angle η in a direction defined by an angle r2 with respect to the flJX axis.

? swan (sinζ −5inβ −5
1na -4-cooζ -comal)2
It is inclined by 222 2.

Regarding the vertical pole 3T; Regulate the height of the tape in the direction of the above angle γ2◎Also,
The first and second inclined poles 35 and 36 and the vertical pole IT are erected on a plane parallel to the reference plane of the sliding base 34.

As described above, the self-manufactured tape loading device of the present invention is a device in which a pair of tape loading pole mechanisms move to pull out a tape from a cassette and wind it around a drum, and each tape loading ball mechanism is tilted. Because it has a configuration with at least two poles,
The tape is wound around the drum nearly 360 degrees at the most recent position where the tape loading ball mechanisms have moved without crossing each other. It is possible to realize automatic loading of Ω-wound tapes at various locations, and the tape running load on the loading pole mechanism can be reduced, and fluctuations can also be suppressed, and good tape running properties can be achieved. has.

[Brief explanation of drawings]

Figure #11 is a diagram schematically showing an example of the positional relationship of the tilted pole with respect to the drum when the tee loading pole mechanism is configured with one tilted pole and G-winding is attempted, Figures 2 and 31 The figures are plan views showing the state of an embodiment of the automatic tape loading device according to the present invention before tape loading and after the tape loading is completed, respectively, and Figures 4 and 5 respectively show the loading pole mechanism after loading the tape. A perspective view and a plan view shown together with the drum, and FIG. 6 are layout diagrams of the drum, the inclined pole, and the vertical pole for explaining the inclination angle, direction, position, etc. of the inclined pole and the vertical pole. 10... Tape automatic loading device, 11... Chassis,
12...Guide drum, 13...Drum entrance side loading ball mechanism, 14...Drum exit side loading pole mechanism, 15...Tape cassette, 16...
・Supply reel, 17... Take-up reel, III, 11・
・Auxiliary loading pole, 20...pinch roller,
21... Magnetic tape, 22.28... Guide groove, 24
...Cab stan, 30.34...Sliding base, 31
゜3s River first inclined pole, 32.36...second inclined pole, 33.37...vertical pole. Figure 3

Claims (1)

[Claims] In a device in which a pair of tape loading ball mechanisms move to pull tape out of seven cassettes and wrap it around the circumferential surface of a drum, each tape loading ball mechanism is configured with at least two inclined poles, An automatic tape loading device characterized in that a cough tag is wound around the drum at a final movement position where the loading ball mechanism moves without crossing each other to form a hanging structure.