JPH06105518B2 - Tape production mechanism - Google Patents

Description

Detailed Description of the Invention

The present invention relates to a VTR tape loading mechanism. [Prior Art] A so-called new U-loading method is known as one of the tape loading methods, which is devised so that the thickness of the loading device can be reduced (Japanese Patent Laid-Open No. 57-86161). In recent years, the miniaturization of VTRs has progressed and a new standard compact VTR called 8mm video has been developed. If a new U-loading system is used for this 8mm video, it is advantageous for miniaturization. As shown in FIG. 16, this system basically comprises a plurality of cylindrical tape guides for spirally winding the magnetic tape (9) on the head drum (1) while pulling out and raising the magnetic tape (9) from the tape cassette (90). A tape pull-out pin mechanism for horizontally pulling the tape out of the cassette (90), which comprises a tape pull-out means (8), a tape pull-out pin (86) and a pinch roller (88), and crimping the tape onto the capstan (81). It is composed of (80). The tape pull-out means (8) includes an inclined guide body (82) arranged around the head drum (1), a movable table (87) slidably fitted on the guide body, and a movable table (87) on the movable table. Deployed 4
A tape guide (83) (83) (84) (84) of a book and a loading ring (not shown) which is arranged below the inclined guide body and surrounds the head drum (1) and rotates in a horizontal plane.
The moving table (87) is driven by the loading ring. The preceding two (83) (8) among the four tape guides
In the unloading state, 3) is located inside the cassette notch (91), that is, in the loop of the tape (9n) before being pulled out in the unloading state, but the two following ( Since 84) and (84) are arranged behind the preceding two (83) and (83) with a space therebetween, they are located outside the cassette notch (91), that is, outside the tape loop. Therefore, the preceding two can be fixedly mounted on the moving table, but the following two cannot be intruded into the tape loop because of the loading method when fixedly mounted, so immediately after the start of loading. It has a stand-up configuration in which it is tilted in advance and rises after entering the tape loop. Therefore, the tape loading mechanism has a drawback that it is very complicated. Tensile stress acts on the running tape, but it is desirable that this stress be uniform in the width direction of the tape. For this purpose, the tape guides of each tape must meet the following three conditions (stable running conditions). It is necessary to determine the position and posture. Conditions that do not twist The tape must not twist between the cassette inlet / outlet, each tape guide, and each head drum. Height conditions (see Figures 16 and 17) The tape entrance point (9u) at the tape guide (89a) where the height of the tape center line from the cassette mounting surface is closest to the supply reel (92), and the take-up reel. Equal to the tape release point (9v) in the tape guide (89b) closest to (93). Parallel condition First tape guide (89a) (89
The running direction of the tape toward b) is parallel to the cassette mounting surface. However, in the conventional new U-loading system, if the diameter of the loading ring is made as small as possible in order to make the mechanism compact, the position and posture of the tape guide are restricted, and the above-mentioned tape stable running condition cannot be satisfied. For example, there is a problem that twist occurs between the tape guides. The applicant has proposed a tape loading mechanism having a novel structure in order to solve the first problem, that is, the problem that the tape loading mechanism is complicated (Japanese Patent Application No. 58-197017). [Object of the Invention] The present invention eliminates the need for a stand-up tape guide by defining the position and posture of each tape guide that satisfies the conditions for stable running of the tape in the tape loading mechanism proposed by the applicant. An object of the present invention is to provide a tape loading mechanism having a simple structure and capable of achieving a stable tape running state without causing uneven stress on the running tape. [Structure of the Invention] In the tape loading mechanism of the present invention, the head drum (1) is mounted on the chassis inclining at an angle equal to the tape winding lead angle LA with respect to the perpendicular of the cassette mounting surface. The magnetic tape (9) is pulled out from 90) and wound around the head drum in a spiral shape while rising at a lead angle LA. In the vicinity of the head drum (1), a first tape pull-out means and a second tape pull-out means are provided so as to form a tape running path from one reel of the tape cassette (90) to the head drum (1). The first tape pull-out means is erected on the first moving body (20) at a fixed relative position to each other on the first moving body (20) and is housed in the cassette notch (91) in the unloading state. A plurality of first tape guides (2) and a first driving body for moving the first moving body (20) along the outer periphery of the head drum (1) while raising the first moving body (20) with respect to the cassette mounting surface. The second tape pull-out means includes a plurality of second tape guides (3) around which the tape is wound between the first tape guide (2) and the tape cassette, and the first tape guide among the second tape guides (3). (2) Leading tape guide on the side (31)
A second moving body (30) provided upright, and a wrapping angle defining tape guide (32) fixedly mounted on the chassis and defining a wrapping angle of the tape with respect to the leading second tape guide (31). ,
Beside the moving path of the first moving body (20), the second moving body (3
2) to move 0) away from the head drum
And a driver. Then, the leading second tape guide (31) is a tape extending from the second tape guide (31) to the first tape guide (2) side in the loading completion state, and the second tape guide (31). It is inclined with respect to the perpendicular of the cassette mounting surface so as to guide both of the tapes extending from the wrapping angle defining tape guide (32) side without twisting. [Operation of the Invention] The first tape guide (2) and the second tape existing in the cassette notch (91), that is, in the tape loop at the time of unloading
The tape guide on the moving body (30) moves along a predetermined path when the first moving body (20) and the second moving body (30) are driven by the first and second driving bodies, and the tape ( 9) is pulled out from the cassette (90) to be loaded. At this time, the first tape guide (2) is attached to the head drum (1).
On the other hand, after the tape is started to be spliced in a plane parallel to the cassette mounting surface, it is wound up along the drum surface and wound at a predetermined angle (about 220 degrees). Since the head drum (1) is inclined at the same angle as the predetermined lead angle LA along the surface of the tape to which it is attached, the tape is wound at the lead angle LA while being in close contact with the drum surface. On the other hand, the tape guide on the second moving body (30) pulls out the tape in a direction parallel to the cassette mounting surface and away from the head drum (1),
The tape mounted between the tape guide (2) and the second tape guide (3) is kept out of contact with the head drum (1). At the same time, the wrapping angle regulation tape guide (32)
Defines the wrap angle of the tape with respect to the first tape guide (31). Here, the wrapping angle regulation tape guide (3
Since 2) is fixed on the chassis, the tape wrap angle is accurately specified. In the loading state, the tape guides of the first and second tape guides (2) and (3) have their axial vectors inclined in a direction parallel to the surface of the upstream and downstream tapes, so that the head drum (1 There is no twist in the tape that returns from () to the cassette (90) through these tape guides. or,
The tape traveling from the cassette (90) to the head drum (1) and the second tape guide (3) has a running direction parallel to the cassette mounting surface, and the height of the tape is equal to the cassette mounting surface. [Effects Unique to the Invention] In the tape loading mechanism according to the present invention, since the tape loop is expanded to the outside of the head drum by the second tape guide located in the cassette notch at the time of unloading, when the loading is completed. Even if the distance between the plurality of first tape guides around which the tape is wound around the head drum is short, the posture of each tape guide can be defined so as to satisfy the stable running condition of the tape. Therefore, the first tape guide and the tape guides on the second moving body can all be positioned in the cassette notches, and the tape guide does not need to be a stand-up type, so that the structure is simple and uneven stress is applied to the running tape. Does not occur. [Embodiment] An embodiment in which the present invention is applied to an 8-mm video will be described below with reference to the drawings. The loading mechanism of this embodiment basically adopts a new U loading mechanism for 8 mm video, and is roughly classified into a tape pull-out pin mechanism, a first tape pull-out means and a second tape pull-out means. First, the first and second tape pull-out means will be described with reference to FIGS.
Description will be given with reference to FIGS. The cassette (90) has a supply reel (92) and a take-up reel (9).
A tape (9) is mounted between 3), and a notch (91) is formed in the front of the cassette. The cassette (90) can be moved up and down by a cassette holder (not shown). The head drum (1) has a built-in video head (not shown), and the lead angle LA (4.
885 degrees) and is inclined so as to be parallel to the direction of arrow A, that is, the direction of the tape (9i) mounted between the head drum (1) and the tape guide (26) (Fig. 9). (See (b)). An annular loading ring (4) is rotatably provided around the head drum (1), and a gear portion (40) is formed on the outer circumference of the ring. As shown in FIG. 3, one end of a joint (41) is connected to the loading ring (4) so that it can be rotated in the vertical direction and is pushed and urged by a coil spring. A first moving body (20) is coupled to the other end of the joint, and the first moving body is attached to the outer circumference of the loading ring.
It is supported by a guide body (5) provided over 270 °. That is, as shown in FIG. 4, the first moving body (20) engages the guide groove (52) formed in the inner periphery of the guide body (5) with its convex portion (51) and bends (53). ) Is movably supported by engaging the upper surface and the outer side of the guide body (5). A columnar leading first tape guide (21) (22) and a trailing first tape guide (23) are planted on the first moving body (20). As shown in FIG. 4, a projecting pin (50) is provided below the preceding first tape guide (21) at the loading completion position where the first moving body (20) is most advanced.
It engages with the recess (11) of the fixed block (10) arranged on the side of the head drum (1). As shown in FIG. 2, on the tape transfer path near the head drum (1) in the loading state, the tape (9) is wound around the head drum (1) at a position that regulates the winding angle to about 220 °. Corner regulation tape guides (24) (26) are fixed. Further, a full-width erasing head (25) is provided opposite to the tape transfer path between the preceding first tape guide (21) and the wrapping angle defining tape guide (24) in the loading state of FIG. There is. Support the spindle (33) near the tape pull-out side of the cassette (90).
A lever-shaped second moving body (30) having one end pivotally supported and a leading second tape guide (31) at the tip is disposed. Regarding the lever withdrawal mechanism for the second moving body,
Description will be given with reference to FIGS. The first gear (34) is coaxially arranged on the support shaft (33) of the second moving body (30),
The first gear (34) meshes with a fan gear (6) pivotally supported by the support shaft (60). An engagement pin (62) is arranged on the fan-shaped gear (6), and the engagement pin (62) is the second pin.
It engages with the cam groove (64) of the gear (63). The second gear (63) meshes with the gear portion (40) of the loading ring (4) via the third gear (65) and the fourth gear (66). Therefore, the second moving body (30) is loaded with the loading ring (4).
In conjunction with the rotation of the tape, the tape (9) is pulled out from the position shown in FIG. 6 (a) to the position shown in (b). Further, the second head in the loading state shown in FIG.
On the tape transition path between the tape guide (31) and the supply reel base (92), the wrap angle regulating tape guide (32) is vertically provided at a position where the wrap angle of the tape with respect to the tape guide is regulated to a predetermined value. It is fixed to. Since various well-known mechanisms can be applied to the tape pull-out pin mechanism, a brief description will be given here with reference to FIGS. 1 and 2. The pinch roller (88) for the capstan (81) is mounted on the pinch roller lever (70) pivotally supported by the support shaft (71), and the support shaft (71) is mounted on the slide member (7). Supported by. A tape pull-out pin (86) is further provided on the slide member. A gear portion (72) is formed on one side of the slide member, and the gear portion (72)
Engages with a loading gear (85) coupled to a loading motor (not shown). In addition, the loading gear (85) is connected to the loading ring (4) through a small gear.
The gear ring (40) also meshes with the loading ring (4) and the slide member (7) in a synchronized manner. Next, the operation of the tape pull-out means will be described. First, as shown in FIG. 1, when the cassette (90) is inserted into a cassette holder (not shown) and lowered to the mounting position, the loading motor (not shown) is energized and the loading gear (85) rotates clockwise. To start. This rotation drives the loading ring (4) clockwise, and the first moving body (20) is driven through the joint (41) as shown in FIG.
1) (22) and (23) pull out the tape (9) and wind it around the head drum (1). At this time, the first moving body (20)
Is guided by a guide body (5) along a predetermined route, and when it reaches the end, as shown in FIG. 5 (a), the protruding pin (50)
The tip of the contact part of the concave part (11) of the fixed block (10). In this state, the protruding pin (50) has the recess (11).
Not parallel to the side wall, but with additional loading ring (4)
Is driven, the protruding pin (50) becomes parallel to the side wall of the recess (11) and is in a crimped state as shown in FIG. 5 (b).
In this crimping state, the inclination angle of the first moving body (20) is different from that before the crimping, but the convex portion (51) of the first moving body (20) has the guide groove (52) of the guide body (5) before the crimping. Since it is engaged with a margin, the moving body can be displaced within this margin. On the other hand, the clockwise rotation of the loading gear (85) causes the slide member (7) to slide in the upper right direction in FIG. By this slide, the tape pull-out pin (86) pulls out the tape (9) in the upper right direction as shown in FIG. On the other hand, the second moving body (30) is pulled out from the state of FIG. 1 to the position of FIG. 2 by the lever pulling-out mechanism shown in FIGS. 6 (a) and 6 (b). When the loading is completed as described above, the tape (9) is wound around the head drum (1) by about 220 ° and the stop mode is set. Next, a method of determining the position and orientation of each tape guide that satisfies the stable running condition of the tape will be described. Since the wrapping angle defining tape guides (26) (32) standing upright with respect to the cassette mounting surface can be easily positioned, the description thereof will be omitted. In order to formulate the running state of the tape, the tape is replaced with a one-dimensional video track center line VTC as shown in FIG. 8, and three unit vectors orthogonal to each other on the VTC,
Consider the tape advancing direction vector, the tape width direction vector, and the tape thickness direction vector _T. The basic coordinate system (xyz) is set at the VTC separation point So of the tape on the head drum (1) as shown in FIG. 9 (a). Xy
The plane is a plane parallel to the cassette mounting surface, and the xyz axis is the tape traveling direction vector in So. , Thickness direction vector And width direction vector It corresponds to each. In the following, the position, tilt angle, and tilt direction of each tape guide will be calculated with respect to the xyz coordinates. A local coordinate system (xyz) is introduced at the VTC entrance and exit points of each tape guide. All Ys in the local coordinate system
The axis is the tape thickness direction vector _T at its origin. Regarding the X and Z axes, there are cases where the X axis coincides with the tape advancing direction vector and cases where the Z axis coincides with the guide axial direction vector ▲ _A ▼. The radius of each guide and head drum is represented by R, the tape winding angle is represented by ω, the angle at which the axial center is the z axis of the basic coordinate system is represented by I, and the inclination direction of the axial center is represented by G. However, the inclination direction G is 0 ° in the x-axis direction and is positive in the counterclockwise direction. In addition, in each of the above-mentioned symbols, S for the head drum (1), E for the erasing head (25), and the tape guide (2
For 4), add 6 and 5 to 1 for each tape guide that follows the tape transition path. Further, the distance between the tape detachment point and the tape incident point of the tape mounted between the head drum (1) and the guide (24) and between the guides is represented by L, and the tape transition path of the guides at both ends of the tape is indicated. In the above, the above-mentioned reference sign representing the guide farther from the head drum is used as a subscript. Hereinafter, the calculation is sequentially performed from the head drum (1) toward the tape guide (32). [1] Coordinates on the head drum The tape is wound around the head drum (1) at the lead angle LA, and the tape traveling direction vector at the tape release point S _0. Is parallel to the cassette mounting surface, the head drum (1) is inclined by LA around the y-axis (see FIG. 9 (b)). The head drum tape detachment point coordinate S ₀ S ₀ is expressed by the following formula in the xyz coordinate. S ₀ = (0,0,0) (1) Next, in FIG. 10, in order to obtain the tape incident point coordinate Sl, the video head rotation center coordinate Sc, and the X reference point Sx, at S ₀
A coordinate system XYZ obtained by rotating the xyz coordinate system around the y axis
think of. In the XYZ coordinate system, the z axis is parallel to the center axis of the head drum. Tape incidence point coordinates Sl (see FIG. _{10) Sl = (- R s sinω} s, R s -R s cosω s, R s ω stan LA) 0 [-LA] _y (2) where () ₀ ( It indicates that the coordinate values in parentheses are the values in the XYZ coordinate system. The following display methods () ₁ , () ₂ etc. will be used to show that the values are obtained in each coordinate system such as X ₁ Y ₁ Z ₁ , X ₂ Y ₂ Z ₂ . [LA] _y indicates the coordinate transformation matrix, the subscript y is y
It indicates that the shaft is rotating, and the value in [] indicates the rotation angle. Coordinate transformation is used to convert the value obtained in the local coordinate system to the xyz basic coordinate system. The coordinate transformation matrix is expressed as follows. Video head rotation center Sc (10 see _{Figure) S c = (0, R} s, R s ω ctan LA) 0 [-LA] _y (6) However, omega _c video track center from the tape withdrawal point of the video heads Is the rotation angle up to. X reference point Sx (control head position reference point) Sx = (− Rs _sin ω ₀ , R _s −R _scos ω ₀ , R _s ω _stan LA) ₀ [−LA] _y (7) X value at S ₀ X ₀ X ₀ = 2R _s ω _s / _cos LA-2R _s (ω _s −ω ₀ ) _cos LA (8) where ω ₀ represents the tape overlap angle on the head drum outlet side. [2] Each vector at the head drum tape detachment point S ₀ [3] Vectors at head drum tape incident point S ₁ Where M ₁ = [-ω _s ] z [-LA] y [4] Head drum axis vector Is equal to the z-axis of the XYZ coordinate system The axis vector of each guide is a unit vector. Tape guide (24) (21) (22) and erasing head (25)
The axial direction vector of the tape is inclined in parallel with the tape width direction vector of the tape guided from the head drum side to each tape guide or erasing head. [5] Coordinates on tape guide (24) (see Fig. 11) Tape release point P ₂ Guide center point Q ₆ The guide center point coordinates are defined as the intersection of the guide axis and the plane perpendicular to the guide axis passing through the tape detachment point of the guide. Tape incident point P ₃ P ₃ = (-R _6sin ω ₆ , R ₆ -R _6cos ω ₆ , 0) ₂ [LA] _y M ₁ + P ₂ (18) [6] Tape incident point P of tape guide (24) Each vector in ₃ Where M ₃ = [-ω ₆ ] z [LA] _y M ₁ [7] Axis vector of tape guide (24) Axis vector Therefore, the angle I ₆ formed by the tape guide (24) and the z axis and the tilt direction G ₆ can be obtained by the following equation. [8] Coordinates on the erasing head (25) (see Fig. 11) Tape release point P ₄ Erase head tip R Center point Q _E Tape incident point P ₅ P ₅ = (−R _Esin ω _E , R _E −R _Ecos ω _E , 0) ₄ M ₃ + P ₄ (27)

[9] Each vector at the tape incident point P ₅ of the erasing head (25) Where M ₅ = [-ω _E ] _z M ₃ [10] Erase head (25) axis vector Tilt angle I _E , tilt direction G _E I _E = I ₆ (32) G _E = G ₆ (33) [11] Each coordinate on the tape guide (21) (see Fig. 11) Tape release point P ₆ Guide center point Q ₆ Tape incident point _{P 7 P 7 = (- R} 5sin ω 5, -R 5 + R 5cos ω 5, 0) each in _{6 M 5 + P 6 (36} ) [12] Tape incident point P ₇ of the tape guide (21) vector Where M ₇ = [ω ₅ ] _z M ₅ [13] Axis vector VA ₅ of tape guide (21), tilt angle
I ₅ , tilt direction G ₅ I ₅ = I ₆ (41) G ₅ = G ₆ (42) [14] Coordinates on tape guide (22) (see Fig. 11) Tape release point P ₈ Guide center point Q ₄ Tape incident point _{P 9 P 9 = (- R} 4sin ω 4, -R 4 + R 4cos ω 4, 0) each in _{8 M 7 + P 8 (45} ) [15] Tape incident point P ₉ of the tape guides (22) vector Where M ₉ = [ω ₄ ] M ₇ [16] Tape guide (22) axis vector Tilt angle I ₄ , tilt direction G ₄ I ₄ = I ₆ (50) G ₄ = G ₆ (51) The tape guides (23) and (31) change the tape running direction. The inclination direction of the tape guide (23) is in the X ₉ Z ₉ plane due to the condition that the tape is not twisted. The inclination angle of the tape guide (23) with respect to the tape guide (22) is I _h . [17] Coordinates on the tape guide (23) (See Figures 12 and 13) Tape release point P _a Guide center point Q ₃ Tape incident point P _b P _b = (− R _3sin ω ₃ , −R ₃ + R _3cos ω ₃ , −R ₃ ω _3tan I _h ) a [I _h ) _y M ₉ + P _a (54) [18] Tape guide ( 23) Each vector at the tape incident point Pb Where M _b = [ω ₃ ] _z [I _h ] _y M ₉ [19] Tape guide (23) axis vector Tilt angle I ₃ , tilt direction G ₃ From the tape guides (24) to (23), the tape wrap angle to each guide, the tape length between guides, the tilt angle, etc. are sequentially determined, and the coordinate values for each guide are calculated by the formulas shown so far. It is possible to obtain vectors, etc. Regarding the tape guide (31), the tape winding angle, inclination angle, and inclination direction are determined by the data given to each guide and the stable running condition of the tape (see FIG. 14). The tape guide (32) is perpendicular to the cassette mounting surface. Coordinate system (X _{e at} the tape release point P _e of the tape guide (32)
The Z axis of Y _e Z _e ) is perpendicular to the cassette mounting surface. The Z component of the vector obtained in this coordinate system is equal to that obtained in the xyz coordinate system, which is the basic coordinate system. Tape winding angle ω ₂ and taper angle I _{4 of the} tape guide (31)
In order to obtain, each vector at the tape detachment point Pc of the tape guide (31) is obtained in the X _e Y _e Z _e coordinate system, and its Z component is Z of each vector at the tape incident point P _b of the tape guide (23).
Take advantage of equality of components. [20] Tape guide (31) in the XeYeZe coordinate system, each vector at the tape release point Pc (see Fig. 14) [21] Tape winding angle ω ₂ and inclination angle I _{2 of the} tape guide (31) (see FIGS. 14 and 15) The xy plane and the XeYe plane are parallel. Therefore From equations (61), (62) and (63) Each Z component of is calculated by the equations (55), (56) and (57). From Eqs. (64), (65) and (66), I ₂ and ω ₂ are calculated by the following equations. [22] Coordinates of tape guide (31) Tape release point P _c Guide center point Q ₂ Inclination angle of tape guide (31) with respect to (23) I _i I _i = I ₂ −I _h (71) Tape incident point P _d [23] Tape length between the tape guides (23) and (31) L _{2 From} the height condition of stable running condition Z component of P _d = 0 (69) (72) (73) [24] Each vector at the tape incident point P _d of the tape guide (31) Where Md = [ω ₂ ] z [I _i ] yMb [25] axis vector of tape guide (31) Tilt direction G ₂ By performing the above calculation, a tape running system satisfying the stable running condition can be obtained. With the conventional new U-loading mechanism, even if the position and orientation of each tape guide is specified using the above-described calculation method, the tape guide position is constrained near the head drum, so that the tape stable running condition is satisfied. This was not possible, but this was possible only by adopting the tape loading mechanism according to the present invention. Head drum (1) radius R _s is 20 mm, lead angle LA is 4.88
5 °, tape winding angle ω _s to head drum 221
°, the overlap angle ω ₀ on the head drum outlet side is 5 °,
Radius R ₆ , R ₅ , R ₄ , R ₃ , R ₂ , R ₁ of each tape guide respectively
Calculations were actually performed using the above method for the cases of 3 mm, 4 mm, 2 mm, 3 mm, 2 mm, and 2 mm. According to this, for example, the tape guide (22) has an inclination angle I ₄ of about 9.1 °, the tape guide (23) has an inclination angle I ₃ of about 7.2 °, and the tape winding angle ω ₂ with respect to the tape guide (31) is It became about 127 °. The full width erasing head (25) may be provided inside the second tape pull-out means as shown in FIG.
Has a wrapping angle regulation tape guide (32) vertically on the tip,
The leading second tape guide (31) is tilted and fixed on the adjusting table (35) whose fixed position can be adjusted, and enables fine adjustment of the running state of the tape. Since the method for determining the position and orientation of each tape guide in the tape loading mechanism shown in FIG. 7 can be mathematically obtained by using coordinate conversion as in the above,
Although omitted here, according to the calculation result for the same input data as described above, the wrap angle of the tape with respect to the leading second tape guide (31) is about 167 °, which corresponds to the tape loading mechanism shown in FIG. About in the calculation result
Greater than 127 °. Therefore, the embodiment of FIG. 1 is preferable to reduce the running resistance of the tape, but the embodiment of FIG. 7 is advantageous in that the space for disposing the full width erasing head (25) can be widened.

[Brief description of drawings]

FIG. 1 is a plan view of the tape loading mechanism in an unloading state, FIG. 2 is a plan view of the same in the loading state, FIG. 3 is a perspective view of a tape pull-out means, and FIG. 4 is a sectional view of a guide body. 5 (a) and 5 (b) are side views of the first moving body before and after crimping, and FIGS. 6 (a) and 6 (b) are plan views of the lever pulling mechanism before and after withdrawal, respectively. FIG. 7 is a plan view showing another embodiment, FIG. 8 is an explanatory view of a vector representing a tape running state, and FIG. 9 (a) is an arrangement of the head drum and each tape guide in the (xyz) basic coordinate system. Fig. 9 (b) is a side view of the head drum, Fig. 10 is an xy plan view in the (xyz) ₀ local coordinate system, and Fig. 11 is xy in the (xyz) ₂ local coordinate system. Top view, No.
Figure 12 is an xy plan view in the (xyz) ₉ local coordinate system, Figure 13 is an xy plan view in the (xyz) a local coordinate system, and Figure 14 is (xy
z) e xy plan view in local coordinate system, Figure 15 is (xyz) _c
FIG. 16 is a plan view showing a conventional example, and FIG. 17 is a plan view illustrating the height condition of the tape in a local coordinate system. (1) ... Head drum, (2) ... First tape guide (20) ... First moving body, (21) ... Leading first tape guide (22) ... Leading first tape guide (23) ... Trailing first Tape guide (3) ... Second tape guide, (30) ... Second moving body (31) ... First second tape guide (8) ... Tape drawing means (9) ... Magnetic tape, (90) ... Cassette

Claims (4)

[Claims] 1. A head drum (1) is mounted on a chassis at an angle equal to a tape winding lead angle LA with respect to a vertical line of a cassette mounting surface, and the tape cassette (90) to a magnetic tape (9). Pull out and lead angle to the head drum
In the tape loading mechanism that winds spirally while raising in LA, a tape running path from one reel of the tape cassette (90) to the head drum (1) is formed near the head drum (1). In order to do so, a first tape pull-out means and a second tape pull-out means are provided, and the first tape pull-out means stands on the first moving body (20) and on the first moving body (20) at a constant relative position. In the unloading state, the head drum (1) is raised while the plurality of first tape guides (2) and the first moving body (20) to be housed in the cassette notches (91) are raised with respect to the cassette mounting surface. ) A first drive member that moves along the outer circumference, and the second tape pull-out means comprises a plurality of second tape guides (3) around which the tape between the first tape guide (2) and the tape cassette is wound, The second tape The second moving body (30) in which the leading tape guide (31) near the first tape guide (2) of the id (3) is erected, and the leading second tape fixedly mounted on the chassis. The wrap angle defining tape guide (32) that defines the wrap angle of the tape with respect to the guide (31) and the second moving body (30) from the head drum at the side of the moving path of the first moving body (20). A second drive member that moves in a direction away from the second tape guide (31) from the second tape guide (31) to the first tape guide (31) when the loading is completed.
In order to guide both the tape extending to the tape guide (2) side and the tape extending from the second tape guide (31) to the wrapping angle defining tape guide (32) side without twist, with respect to the perpendicular line of the cassette mounting surface. Tape loading mechanism characterized by being inclined. 2. The leading first tape guide except for the trailing tape guide (23) in the first tape guide (2) in the loading state is a tape guided from the head drum (1) to the guide. The tape (9d) which is inclined along the surface of (9f) in the direction of the tape width direction vector perpendicular to the tape running direction, and the trailing first tape guide (23) runs between the leading first tape guide and the leading first tape guide. 2. The tape according to claim 1, wherein the tape is inclined parallel to the vector in the width direction of the tape or in the direction of a combined vector of the vector and the vector heading to the preceding first tape guide along the tape (9d). Loading mechanism. 3. The tape loading mechanism according to claim 1 or 2, wherein the first tape guide (2) comprises three tape guides (21) (22) (23). 4. In the loading state, the first tape guide (2) and the second tape guide (3) have their respective central axes guided from the head drum side toward the tape guide without twisting. Is placed in a plane parallel to the first tape guide (31) and the central axis of the second tape guide (31) is
The running direction of the tape (9b) from the tape guide (31) toward the tape cassette side is parallel to the cassette mounting surface, and the tape surface is inclined so as to be perpendicular to the cassette mounting surface, and the head second tape guide (31) Is the tape (9
The tape loading mechanism according to claim 1, wherein b) is provided at the same height as the supply or take-up reel in the cassette and is arranged at a position where this height can be maintained.