JPS6154067A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To use two-way system tape cassettes different in system by switching the gradient of a common tape guide drum axis and a take-in angle of tape against the guide drum according to the selection of two kinds tape lead angles. CONSTITUTION:According to the selection of a first and second tape cassette, two gradient lead angles 73, 74 are used half-rotating a fixed below drum 72 on the different position of the gradient lead angles 73, 74 to both positive and negative directions. In addition, an axis gradient of a tape guided drum 70 is made different by the difference of a tape lead angle according to the selection of tape guides 73, 74 to equalize travelling angle of tapes 23, 24. Further, axis 143, 145 which consists of an entrance and exit guiding methods for controlling a tape take-in angle against a tape guided drum 70 and 143, 148-150 are switched individually according to the selection of tape lead angles 73, 74. Therefore, two-way system tape cassette can be commonly used.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a magnetic recording/reproducing device.

[Conventional technology]

In the current consumer video tape recorders (hereinafter abbreviated as VTR), βmax (registered trademark) and VH3
There is a conflict between the two types of VTRs, and there is no compatibility between the two types of VTRs.

By the way, both types of VTRs use tape cassettes,
A magnetic tape is pulled out from a tape cassette and wrapped around a tape guide drum at an angle of approximately 180°, and a pair of rotating magnetic tapes arranged at an angle of 180° are provided on the tape guide drum. The head modulates and records a video signal so as to form a tilted track on the magnetic tape, and the rotary magnetic head scans the tilted track to reproduce the modulated video signal. is set to -.

However, the structure and dimensions of the tape cassette, the dimensions and lead angle of the tape guide drum, the relative speed between the magnetic tape and the rotating magnetic head, the loading method of winding the tape pulled out from the tape cassette around the tape guide drum, the recording of the tape, etc. There are various differences in patterns, signal processing methods in recording and reproducing systems, etc.

First, the differences in size, shape, and function of both types of tape cassettes will be explained with reference to FIGS. 1 and 2. In Fig. 1 and Fig. 2, (1) is a β-max tape cassette (hereinafter abbreviated as β-cassette), (la),
(lb) has both sides of it, and .

(2) shows a VH5 tape cassette (hereinafter abbreviated as VHS cassette), (2a) and (2b) show both sides thereof, and Fig. 1 is a perspective bottom view of the cassette (1) and (21). Figure 2 is a side view of each short side thereof.

(3), +4) are the β supply and take-up reels, and the interval between them is 1, (51, (61 is the VH3 supply and take-up reel, and the interval is 12, then 1i1 (=92i
o*) <12 (=76 cranes), the difference 12-ffi1 is 1s (-16m) *14+1G is the respective width of β cassette (1).

The depth and 15 + lT are the respective widths of VHS case 7) (2).

The depth is 114 (-156 cranes) <j! 5
(-188w), i6 (=96mm) < j! t
(=104 +u), β cassette (1)
is smaller than the VHS cassette (2). In addition, the thickness of β and VHS cassettes (13, 12) II g
(-25mm) are equal.

Both β and VHS cassettes (1) and (2) have a fi with a substantially U-shaped cross section on their front faces (upper side in Figure 1), facing the β tape (23) and VHS tape (24). (71° (8) are provided respectively, and β provided on both sides of each
pin (9), VHS pin connection β cassette (1),
The VHS cassette (2) is rotatably attached to the main body, and the opening on the tape side of each main body is opened and closed by these 1i (7) and (8). In addition, these lids (η, (8) are kept closed when not in use.
It is elastically biased counterclockwise in FIG. 2 by a built-in return spring (not shown). In addition, these lids (7
), (B) is in the closed state, a mechanism in which the state is locked, and β and V HS IJ-rule (3).

(4) ; (5) and (6) are locking mechanisms (none of which are shown) for β and VHS cassettes [1
) and (2) respectively.

Built-in.

Each of these cassettes (11, (21) has a large symmetrical trapezoidal β notch (1
1) and a small asymmetrical trapezoidal V HS notch (12
) is provided.

However, as can be seen from Figure 1, both force sets (11,
(Align the 21 with their front sides, and both supply reels (3).

When superimposed so that each axis of (5) coincides,
The VH3 notch (12) comes approximately at the center of the β notch (11).

On the bottom of both power sets (1) and (2), on the front side,
A pair of β through holes (13) and (14) into which a pair of positioning pins on the VTR side are respectively inserted, and a pair of VH3
Although through holes (15) and (16) are bored, their positions and intervals are different from each other.

On the bottom of the β cassette (1), there are a pair of slit-shaped notches at both left and right ends of the front side, into which the VTR's β lid, reel lock release plate, and β lid raising plate are respectively inserted.
17) and (18) are provided.

Note that one notch (17) is cut into a part of the lower end of 8M (7).

The bottom of the VHS cassette (2) is provided with a slit-shaped notch (19) at a position biased to the side thereof into which a VH3 lid raising plate of a VTR is inserted.

In addition, in the overlapping state of both cassettes (1) and (2) mentioned above, the β notch (18) and the VH3 notch (
19) The distance 13 between them is 9 cranes.

A protrusion (2o) for unlocking the lid is protruded from one side (2b) of the VHS cassette (2) at a position biased toward the front side.

On the bottom of the VHS cassette (2), there are a pair of insertion holes (2) in the front and back approximately in the center, into which the light source for the tape end sensor of the VTR and the reel lock release pin are respectively inserted.
1) and (22) are provided.

Next, we will explain the conventional β-VTR, VH3-VTR (D tape guide drum, tape running system, and tape loading onto the tape guide drum.
TR will be explained with reference to FIGS. 3 to 5. Third
4 and 4 show the state in which the magnetic tape is loaded onto the tape guide drum (U-loading), and these figures will be explained below. (30) is the tape guide drum (74.487 m in diameter), and the fixed upper drum (31)
, a fixed lower drum (32), and a rotating disk (33) between them, and a pair of rotating magnetic heads (33H) are attached to the rotating disk (33) so as to face the outside. Tape (23) is attached to the lower drum (32).
) in contact with the lower edge of the inclined lead guide (the lead angle is 5
°) is provided. A loading ring (34) is rotatably arranged around the drum (30), and both are spaced apart from each other. On the ring (34) is a rotation guide (35).
) to (37) and a pinch roller (38) are provided. Of these, the guide (35) is for drawing out the tape. The guides (35), (36) are planted directly on the ring (34). The guide (37) is a ring (34)
A pair of mutually rotating connecting arms (39
), (40) is planted at the free end of one arm (4o). The guide (37) is the length m of the guide groove plate (41)
(notch) (41a).

The pinch roller (38) is installed at the free end of an arm (42) rotatably supported on the ring (34).

(43) is a tensing regular rake arm, which is rotatably supported on a fixed part, and has a pin (guide) (4) at its free end.
3a) is planted. (44) is a full-width erasing head, (45) is an audio/control head, (46) is an audio erasing head, and (47) is a capstan, all of which are provided on the fixed part.

Next, as shown in FIG. 3, FIG. 4, and FIG. 5C, the tape running path when the tape (23) is wound around the drum (30) will be described. The tape (23) fed out from the supply reel (3) passes through the guide in the cassette (1) and then passes through the pin (43a) of the tension regulator arm (43) - erasing head (44) path to the drum. (30) (wrap angle is 188°), then erase head (46) - audio/control head (45) - capstan (47) and pinch roller (3
8) Between - Tape drawer guide (35) - Guide (36)
- It passes through the path of the guide (37) and is wound up on the l & winding reel (4) which has passed through the guide in the cassette (1).

In Fig. 4, the ring (34) rotates in the counterclockwise direction α during loading, and clockwise β during unloading.
Rotate to. T indicates the running direction of the tape (23), and δ indicates the rotation direction of the rotating disk (33).

Figure 5 A-C shows tape (23) against drum (30)
As originally shown in FIG. 5A, the guides (35), (36), (37) and the pinch roller (38) are located inside the tape (23) on the front of the cassette 11). Then, as the ring (34) rotates in the counterclockwise direction α, the tape (23) is pulled out by the guide (35), and the tape (23) is pulled out as shown in FIG. 5B.
) begins to be wound around the drum (30).
As shown in FIGS. 3 and 4, the winding of the tape (23) around the drum (30) is completed, and the tape (23) is wrapped around the drum (30).
3) is the capstan (47) and pinch roller (38)
It is clamped and driven to run at a constant speed.

The characteristic of loading tape onto the tape guide drum of β-VTR is that the tape is pulled out from the tape cassette and wound to the opposite side of the tape cassette with respect to the diameter of the tape guide drum parallel to the front surface of the tape cassette. be.

Next, referring to FIG. 6, the VH3-VTR will be explained. Figure 6 shows the state in which the magnetic tape is loaded onto the tape guide drum (M loading).
) is a tape guide drum (diameter: 62 mm) (β drum (
The shaft is tilted compared to the rotating upper drum (51).
), fixed lower drum (52) and rotating upper drum (51)
attached to both drums (51).

(52) and a rotating magnetic head (53) mounted on the lower rotating drum (52) so as to be exposed to the outside.
It consists of Tape (24) on the lower drum (52)
An inclined lead guide that contacts the lower edge of the (lead angle is 5.
94°) is provided. (54) to (60) are guides, of which (55) is a back tension post guide, and (56) to (59) are moving guides for tape drawer and tape loading. 24) and loaded onto the drum (50). Among movement guides (56) to (59), (57)
, (5B) is the drum (50) of the magnetic tape (24).
) is a slanted guide that determines the angle.
(63) and (64) are impedance rollers,
respective guides (56) via tapes (24).

(59).

(62) is a full width erase head, (65) is an audio erase head, and (66) is an audio/control head.

(61) is the capstan, (67) is the pinch roller,
The tape (24) is held between these and driven at a constant speed.

Next, the tape running path when the tape (24) is wound around the drum (50) will be explained. Supply reel (5)
After passing through the guide in the cassette (2), the tape (24) fed out from the cassette (2) passes through the guide (54)
5) - Erasing head (62) - Impedance roller (
63) - Guide (56) - Guide (57) and is wound around the drum (50) (the winding angle is 157°).
), furthermore, a guide (58) - a guide (59) - an impedance roller (64) - an erasing head (65) - an audio/control head (66) - a guide (60) - a capstan (61) and a pinch roller (67). - after passing through the guide in the cassette (2), the take-up reel (6
). Note that δ indicates the rotational direction (counter-hour hand direction) of the i-axis drum (51), and T indicates the tape running direction.

As mentioned above, the V of βmax method and VH3 method
There are many differences from TR in the structure and dimensions of the tape force set, the structure and dimensions of the tape guide drum, the method of loading the tape onto the tape guide drum, etc., but there is no possibility of standardization. isn't it.

Therefore, a VTR for both the β system and the VH3 system, which can use tape cassettes, has been published by the applicant in Japanese Patent Laid-Open No. 56-119916 and Japanese Patent Laid-open No. 56-11996.
This is proposed in Publication No. 7, etc. This VTR stacks a VHS tape guide drum on a β tape guide drum and moves both drums up and down.
Switching between β and VHS modes is performed.

[Problem that the invention seeks to solve]

In addition to the trouble of removing and installing the VH3 system drum when replacing the β system rotating magnetic head and the troublesome time of readjusting the drum installation after replacing the head, such VTRs also have problems with the height of the tape guide drum. This has the disadvantage that the thickness of the device increases.

In view of these points, the present invention has a tape guide drum that has a simple structure, can reduce its height, and can share most of the tape running system, and can be used as a tape cassette for two different types of magnetic recording and reproducing devices. The purpose of this paper is to propose a magnetic recording and reproducing device that can be used.

[Means for solving problems]

The magnetic recording and reproducing apparatus according to the present invention includes a tape guide drum (70) having a rotary head H, and first and second tape leads provided at different positions on a fixed drum (72) of the tape guide drum (70). Angle determining means (73),
(74), the shaft of the tape guide drum (70), and the tape winding on this tape guide drum (70) are the entrance and exit guide means (143) and (14) for corner regulation.
5), Among the axes (14B) to (150), the angle between one axis and the other two axes is determined by the first and second tape lead angle determining means 1 (73), (74). The present invention is characterized in that it includes angle switching means for switching to different angles in connection with the selection.

(Function) According to the present invention, the tape winding around the common axis of the tape guide drum and the axis of the inlet and outlet guide means for corner regulation is performed with respect to one axis and the other two axes. the angle formed by the first and second tape lead angle determining means, respectively.
By switching the angle, tape cassettes of two different types of magnetic recording/reproducing apparatus can be selectively used.

〔Example〕

An embodiment of the present invention will be described in detail with reference to FIG. 7 and subsequent figures. First, the tape guide drum device will be explained with reference to FIGS. 7 to 12 (mainly FIGS. 7 and 8). (69) shows the tape guide drum device as a whole, (70) shows the tape guide drum, and (71) shows the tape guide drum device as a whole.
) is the rotating upper drum ((71M) is its drive motor),
(72) is a fixed lower drum, and its root diameter is selected to be 74.487 m, which is the same as the drum diameter of the β method. As shown in FIG. 8, on one half of the fixed lower drum (72) there is a β inclined lead guide (73) with a lead angle of 5.94°,
The other half has a lead angle of 5.94° (7) V HS
JiJ inclined lead guides (74) are respectively formed,
The fixed lower drum is rotated approximately half a turn in both the positive and negative directions in accordance with the β mode and the VHS mode, so that the inclined lead guide of each mode is positioned to the left in FIG.

Note that the lead guide may not be provided directly on the drum, but may be provided separately around the drum. In FIG. 7, H is a rotating magnetic head mounted on the drum (71) so as to face the outside between the drums (71) and (72).

FIG. 8 illustrates the β mode state of the tape guide drum device (69), in which the tape (23) of the β cassette (1) is guided by the β (1) oblique lead guide (73). (71) and (72) are wound diagonally.

Furthermore, in this tape guide drum device (69), the axis AXβ of the drum (70) in β mode and VHS mode,
AXv, passes through the center I) of the tape width at the tape exit part (also the entrance part) of the drum (70),
) around an axis perpendicular to the axis of VHS by an angle α'('=1°) corresponding to the difference in the tape lead angles of β and VHS, and the tapes of both modes exit the tape outlet of the drum (70). (23).

The running angles of (24) are made to be equal.

(75) is a cylindrical base body to which a fixed lower drum (72) is attached by screwing, and a large gear (76) is attached to the flange (75a) at the lower end thereof.

(77) is a cylindrical base, around which is a bearing (78).
), the above-mentioned cylindrical base (75) via (79)
is rotatably mounted. (80) is a substrate whose bottom surface is a cylindrical convex surface and which can swing in the circumferential direction;
(81) is a pedestal with a cylindrical concave upper surface, and receives the substrate (80) via four rollers (82) arranged at each corner of a rectangle. This pedestal (81) is a board (83)
fixed on top. (84).

Reference numerals (85) are regulating plates that regulate the swinging of the board (80), and are fixed to both sides of the pedestal (81). (86).

(87) is a tension spring stretched between the substrate (80) and the pedestal (82), and is elastic so as to press the substrate (80) against the roller (82) along a line symmetrical direction passing through the center P. It's biased. (88) is another tension spring stretched between the base plate (80) and the pedestal (82), which biases the base plate (80) counterclockwise in FIG.

(89) is an upper extension board extending from the board (80), on which a pillar (92) having upper and lower gears (90) and (91) is rotatably supported by a shaft (93). has been done. An F section extension base (94) is attached to the bottom of this upper extension base & (89), and this lower extension board (94
) between both bent parts (94a) and (94b),
A worm (95) that meshes with the gear (91) and a motor (DC motor) (96) that drives the worm are installed so as to extend across the gear.

Thus, the gear (91) is rotated by the worm (95) being rotationally driven by the motor (96).

The gear (76) is rotated via the gear (90), thereby causing the drum (71), <72) to connect to the substrate (75).
At the same time, it is rotated approximately half a rotation in both positive and negative directions around the base (77). .

Next, the driving means for swinging the substrate (80) will be explained with reference to FIGS. 7 to 9. (100) is a plunger and is attached to the substrate (83) using a fixture (101) (see FIG. 7). , (100a) is the operating rod of the plunger (10G). (102) is a substantially U-shaped frame attached to the substrate (83), and a shaft <103) is spanned between both legs of this frame.

By this axis <103), in the orthogonal coordinate system, a thin plate-shaped arm (104) consisting of parts extending in the −Z-axis, X-axis, and Y-axis directions sequentially rotates around the frame (102). It is pivoted for free movement. The free end of the -2 axis direction portion of the arm (104) is connected to the operating rod (100a) of the plunger (100).
connected to. A roller (105) is rotatably supported at the free end of the arm (104) in the Y-axis direction. A leaf spring (106) is attached to one side of the lower extension board (94), and the roller (105) is connected to the lower extension board (94) via this leaf spring (106). J1 can be matched.

In β mode, the operating rod (100) of the plunger (100)
The plunger (100) is biased so that the arm (104) moves to the right in FIG.
) rotates counterclockwise in Figure 8, and the leaf spring (1
06) to slightly lift the lower extension board (104), thereby rotationally biasing the board (80) clockwise in FIG. At this time, the left side portion of the substrate (80) in FIG. 8 abuts against the regulation plate (84).

In VHS mode, the operating rod (100) during plunge (
The plunger (100) is deenergized such that the plunger (100a) moves to the left in FIG.
04) rotates clockwise in Fig. 8, and the spring (88
) causes the substrate (80) to be rotationally biased in the counterclockwise direction in FIG.

At this time, the right portion of the substrate (80) in FIG. 8 abuts against the regulation plate (85).

Next, mainly referring to FIGS. 7 and 9 to 12,
The means for regulating the rotational positions of the drum (70) and the base (75) will be explained. The flange of the base body (75) has pins (111) on diameters perpendicular to each other.

(112); (113) and (114) are screwed together, and long holes (115) are formed in the respective gears and are long in the circumferential direction.

(116): It is loosely fitted into (117) and (118). Pin (113) and gear (76
) and between the pin (114) and the gear (76) are a pair of symmetrical springs (121) and (122);
(123) and (124) are stretched. The elastic biasing force of the springs (121) to (124) causes the pins (111) to (114) to move into the elongated hole (1).
15) to (11B).

Especially for pins (111) and (112),
A pair of 5-shaped stoppers (125) and (126) for β and VHS modes are provided on the board (80), respectively. The stopper (126) in VHS mode is located on the straight line connecting pins (111) and (112), but the stopper (125) in β mode is offset 15.5 degrees clockwise from that straight line. There is.

Next, mainly referring to FIGS. 7 and 9 to 12,
The rotational position detection means for the drums (71), (72) and the base (75) will be explained. (127).

(12B) are photosensors for β and VHS modes, respectively, and are arranged on the upper extension board (B9) symmetrically with respect to the pin (114) at a predetermined angle. In addition, β and Vl-1 are used to detect the rotation angle positions of the drum (70) and the base body (75) with these sensors (127) and (12B).
Light shielding plates (129) and (130) at 5%-F are attached to the lower side of the gear (76).

Figure 13 shows β and VHS installed on the fixed lower drum (73).
The positions and angles of the lead guides (73) and (74) are shown, and the angles (corresponding to the total wrapping angle of the tape) are respectively
188°, 157°, 4° on each side.

The angular spacing between the two lead guides (73) and (74) with an overlap angle of 3.66 degrees is 7.
5°, and the exit of the β tape (23) and the VHS
Place the drum (7) so that the outlet of the tape (24) coincides with the outlet.
1) , (72) and the base (75) are rotated by half a turn, more precisely 164.5°, to perform lead switching.

β and V by rotating the drum (70) and base (75)
HS (7) IJ-)' Guide (73),
(74), the gear (76) is rotated by the motor (96) via the reduction gear mechanism, but the pin (111) or (112) is rotated by the stopper (12).
5) or (126), the photosensor (127) or (12B) does not yet detect the light shielding plate (129) or (130) at that point, and therefore, the gear (76) and the spring (121) ) to (124), and when the light shielding plate (129) or (130) is detected by the photosensor (127) or (12B), the motor (96) stops rotating. It stops and the rotation of the gears also stops. The rotation of the gear (76) is locked by the engagement between the worm (96) and the gear (91).

Adjust the diameter of the drum (70) to the β system drum diameter, and set the rotating drum (71) at 1800 rpm for the NTSC system.
In the case of the CCIR method, rotate at a rotation speed of 1500 rpm, but in the case of the VH3 method, the number of fields is the same as the β method, but the drum diameter is larger than the VB2 standard, so the time axis is different from that of both methods. It is shortened according to the drum diameter ratio. Therefore, in the case of the VH3 system, the signal may be temporally compressed and recorded according to the ratio, and after playback, the signal may be temporally expanded and returned to the original signal.

Since the gap azimuths of the rotating magnetic heads for β and VH3 are 7° and 6°, respectively, the rotating magnetic heads (total [1) for β and VH3 are attached to the upper rotating drum (71) at predetermined angular intervals. In this case, if you change the polarity of the common pulse generation magnet or increase the number of pulses, P
The number of C coils does not have to be 4, but can be 2 (lal), but considering that the gap azimuth difference between both types is only 1°, it is better to use head 2 (lal) with a gap azimuth of 7°.
al and one head with a gap azimuth of 6° (or vice versa). Furthermore, if you perform azimuth correction, the gap azimuth should be 6° or 7°.
It is also possible to provide only two heads. The number of channels of the zero-rotation transformer corresponds to the number of heads, but if the heads are switched within the rotating drum (71), only two channels are required.

If the tape guide drum (70) is composed of upper and lower fixed drums and a rotating disk therebetween, lead guides for β and VH3 may be provided on the upper and lower fixed drums, respectively.

Next, with reference to FIG. 14, a description will be given of the tape running system and the loading (threading) of the tape onto the tape guide drum. Figure 14 shows the state in which the magnetic tape is loaded onto the tape guide drum.
134) are rotatably arranged, and both are separated from each other. Guides (135) to (139) and a pinch roller (140) are provided on the ring (134). guide(
135) is a guide for drawing out the tape. (141)
- (146) are fixed guides attached to the fixed part. Reference numeral (147) is a tension regulator guide, which is not shown but is mounted on the tension arm and rotated as shown. (14B), (149), and (150) are guides that are not used when they are in the β mode because they fall down as shown in FIG. 15, and when they are in the VHS mode, they stand up and are in use as shown in FIG. Of these, guides (148) and (149) are inclined guides, and guide (150) is an upright guide with a collar under the rain. These guides (14B) to (150) (guide (150)
) can be omitted), it is possible to make the tape traveling angle to the tape entrance portion equal in the β mode and in the VHS mode.

(14B) is the capstan, tape (23) or (2
4) is pinched in cooperation with the pinch roller (14d) and run at a constant speed. (168) is a full width erase head, (151A
) is β, voice erasing head shared by VH3, (15111)
is the audio/control head for β, (151C) is the VH
This is a voice/control head for 3.

Next, with reference to FIGS. 15 and 16, the guide (14
8) to (150) will be explained. Guide (149)
, (150) are installed on a common block (152), and this block (152) is rotatable around an axis (153).
A lever (154) rotatably mounted via the lever (154)
) is further rotatably supported around a shaft (155), and the cylindrical free end (154a) of the lever (154) comes into sliding contact with the cam surface (156a) of the inclined cam (156).

The lever (154) is pivoted counterclockwise by a tension spring (165). In response to movement of the arm (157) to which the cam (156) is attached in the direction of the arrow, the lever (154) is rotated around the shaft (155), thereby causing the guides (149) and (150) to stand up. It is controlled so that it tilts horizontally (in VHS mode) or 90 degrees horizontally (in β mode). Furthermore, arm (157)
is the interval between the supply and take-up reel tables, which will be described later, as β and VH.
It is attached to a switching means that switches according to the S mode, and is moved in conjunction with the switching.

On the other hand, the guide (14B) is installed on a block (158), and this block (152) is made rotatable around an axis (159).
A lever (160) rotatably mounted via a)
is rotatably supported around a shaft (161), and a lever (
The free end (160a) of the lever (160) is rotatably attached to the lever (163) via the shaft (162).
163) is the operating rod (164a) of the plunger (164)
mounted on. The lever (160) has a tension spring (16
6), it is rotationally biased counterclockwise. In this case, in the β mode, the plunger (164) is deenergized, the operating rod (164a) protrudes, and the guide (148) is tilted laterally by 90° due to the elastic force of the spring (166). V
Conversely, in the HS mode, the plunger (164) is energized, the operating rod (164a) is retracted inside, and the spring (166)
The guide (148) will stand up against the elastic force of the tape (23) at the completion of loading onto the drum (70).

Next, by rotating the loading ring (134) in the counterclockwise direction β, the tape (23) or (24) is transferred to the drum (
70), the travel path of the Qi 7" will be explained with reference to FIG. 14. β or VH3 force set I-+
11, β or VHS tape (23), (24) fed out from the supply reel (3) or (5) of (2)
is the guide (144) - tension regulator guide (
After passing through the common path of 147) - erasing head (149) - guide (145), the β tape (23) is transferred to the drum (7 o
) with an incident angle of 5°, and a VHS tape (2
4) is guide (148) - guide (149) - (15
0) with an angle of incidence of 5.94°.
70). For the VHS tape (24), the tape (24) is wrapped around the drum (70) by the guides (148) and (149). After HIM adjustment is performed, the tape (24) is It is made to be well guided by the lead (74).

The tape (23) or (24) that comes out of the drum (70) is guided by the guide (143) - guide (142) - β, VH3 common erasing head (151^) - β audio/control head l' (151B) - VH3 Audio control head (151C) - Guide (141) - Capstan (
14B) and the pinch roller (140) - the guide (1
35) - guide (136) - guide (137) - guide (138) - guide (139) - guide (146) and is wound onto the take-up reel (4) or (6).

In addition, in FIG. 8, β, Vl (S tape (23).

(24) When the center of the tape width of the artificial part to be wound around the drum (70) is common, the substrate (80) is rotated around an axis passing through the center and orthogonal to the axis of the drum (70). guides (148) to (15) in Fig. 14.
0) may be provided on the tape exit side of the drum (70).

Next, the cassette mounting mechanism will be explained with reference to FIGS. 17 and 18. Here, FIG. 17 shows the β mode, and FIG. 18 shows the VHS mode.

In both figures, (200) is a supply reel stand, and coaxially with this is a reel shaft (201) and a supply reel motor (
202) are integrally arranged and rotatably attached to a supply reel base board (not shown).

(210') is a take-up reel stand, on which a reel shaft (211) and a take-up reel motor (212) are integrally arranged, and a movable take-up reel stand board (213).
It is rotatably mounted on the

Both side edges (214) and (215) of the take-up reel base board (213'') are guide members (203) fixed to the chassis.
and (204) guides 1 (205) and (206”)
is slidably supported. , Also, the reel stand board (21
A rack (217'') is fixed to the extension (216'') of 3).

(220) is a motor for switching operation modes, (221) is a motor, and each has a small pulley (222).
).

The large pulley (223) is installed, and both pulleys (222
) and (223'), bell 1-(224) is stretched between them.

Worm wheel (22) that meshes with the worm (221)
5), a gear (227) is attached to the other part of the rotating shaft (226), and the gear (227) is engaged with the rack (217) attached to the extension part (216) of the reel base board (213). There is.

(230) is a switching member with an L-shaped cross section, and a long hole (232) provided at one end of its horizontal portion (231).
A fixed shaft (207) set up on the chassis is inserted, and the other end of the horizontal portion (231) is connected to the reel base board (213) via a connecting member (233). The vertical wall (234) of the switching member (230) has a pair of inclined guide grooves (2
35) and (236) and a pair of inclined guide grooves (237) and (238) for VHS are provided. In addition, each pair of inclined guide grooves (235).

(236), (237), and (23B) are formed so that their height changes are exactly opposite. Further, the arm (157) of the inclined cam (156) shown in FIGS. 15 and 16 is fixed to the vertical wall (234).

(240) is a lid opening member, and the upper edge (242) of the vertical part (241) bent into an L shape is the lid (?) of the tape cassette (11, T2+) shown in FIG. +81.The horizontal part (243) of the opening member (240) is provided with a long hole (244), and the other end of the horizontal part (231) of the switching member (230) is inserted into this long hole (244). A pair of erected guide pins (245'') and (246) are inserted.The lid opening member (240) is moved in the extending direction of the horizontal portion (231) by a biasing spring (not shown). It is shifted to the right side of the figure.

(251) and (252) are a pair of left and right positioning mechanisms for β, which are similar to the tape cassette for β shown in FIG.
0 pins (251) and (2) provided at positions corresponding to the positioning holes (13) and (14) in 1).
Branch bins (253) and (254) installed in
) is the β inclined guide groove (235) of the switching member (230)
, (236) respectively). In addition, both positioning pins <251) and (252) are connected to a pair of height regulating tubes (2) provided on the guide member (204).
55) and (256) so as to be movable up and down.

(261) and (262) are a pair of left and right positioning pins for VH3, which are the through holes (15), (2) for positioning the VH5 tape cassette (z) (2) shown in FIG.
16) corresponding to 0-ryo bins (261), (262
) branch bins (263'), (264)
is the switching member (230) (7) VH3 inclined guide groove (23
7) and (238), respectively. Also, both positioning pins (261).

(262) is supported so as to be movable up and down within a pair of height regulating tubes (265) and (266') provided on the guide member (204).

(271) and (273) are the end sensor light source and reel lock release pin for the VH3 tape cassette (2), respectively, and both are fixed to the rotation shaft (274'), and the rotation shaft (274) is connected to the supply reel stand. (200) and the take-up reel stand (210). As shown in FIG. 18, the pin (272) provided at the bottom of the end sensor light source (271) is connected to the switching member (230).
It engages with a notch (239'') provided in the vertical wall (234) of.

In the β mode shown in FIG. 17, the supply reel stand (2
00)' and the take-up reel stand (210) to be equal to the distance 11 between the supply reel (3) and take-up reel (4) of the β tape cassette (1) shown in FIG. When the motor (220) is energized to rotate forward by a switch (not shown), the worm wheel (225)
rotates counterclockwise, and the rack (217) is rotated by a gear (227") whose rotation is regulated to 180 degrees as described later.
is driven such that the take-up reel base board (213) approaches the supply reel base (200), the guide member (203);
(204). In addition, the reel base board (2
13), the switching member (2
30) also slides to the left in FIG. 17 in the extending direction, and β
Locating pin (251').

The branch pins (253) and (254) of (252) are connected to the inclined guide grooves (235) and (254) of the switching member (230).
Since it is located at the high part (235h), (236h) of 36), the positioning pin (251), (
252) protrudes from the height regulating tubes (255') and (256). On the other hand, the VHS positioning pin (261),
The branch bins (263) and (264) of (262) are connected to the inclined guide grooves (237) and (264) of the switching member (230).
23B) lower part (2371), (238I
t>, so the positioning pin (261),
(262) is the height regulating tube (265), (26
6) It is descending within. In addition, the light source for the end sensor (2
71) and the reel lock release pin (273) are in a horizontal state when the switching member (230) slides to the left in β mode, and do not interfere with the β tape cassette (1).

In the VHS mode shown in FIG. 18, the distance between the supply reel stand (200) and the take-up reel stand (210) is
Supply reel (5) of VH3 tape cassette (2) shown in the figure
In order to equalize the distance 12 between the take-up reel (6) and the take-up reel (6), the motor (220) is
When the worm wheel (2
25) is rotated clockwise, and the rotation is 180 degrees as described below.
Rack (217) by gear (227) regulated to
) is driven, and the take-up reel base plate (213) slides away from the supply reel base (200). Also,
As the reel base & (213) slides, the switching member (230) connected thereto also moves to the first position in its extending direction.
Slide to the right in Figure 8 and insert the β positioning pin (251).
(252) technique pin (253), (254)
is the inclined guide groove (235) of the switching member (230),
The lower part (235N) of (236).

(2361), so the positioning pin (25
1'), (252) is the height regulating tube (255)
, descends into (256). On the other hand, the positioning pin (261) for VH3.

The branch pins (263) and (264) of (262') are connected to the inclined guide grooves (237) and (264) of the switching member (230).
238) trade part (237h), (238h)
Since it is located at the positioning pin (261),
(262) is a height regulating cylinder (265).

Projects from (266).

Furthermore, in the V) Isβ mode, when the switching member (230) slides to the right, the protrusion (272) at the bottom of the end sensor light source (271) is inserted into the notch (239) of the vertical wall (234).
ζ is engaged, so the end sensor light source (271) rotates 90° about the rotation axis (274) and becomes vertical, and at the same time, the reel lock release pin (273) also becomes vertical. In this state, VH3 tape cassette (2)
When installed, the end sensor light source (271) and reel lock release pin (273) are inserted into the insertion holes (21) and (22), respectively.

In addition, the opening member (240) moves to the right together with the switching member (230), but the sliding distance of the switching member (230), that is, the supply of the VH3 tape cassette (2), the S-t
As is clear from FIG. Notches (18) and (19) for inserting 240)
Since the difference in distance between the supply reels (3) and (5) is larger than β3, the horizontal part (243) of the opening member (240)
The right edge (247) of the lid-opening member (240) is brought into contact with a regulating member (not shown) to restrict movement of the lid-opening member (240) to a required distance.

Next, the cassette guide mechanism will be explained with reference to FIGS. 19 and 20. FIG. 19 shows the β mode, and FIG. 20 shows the VHS mode.

In both figures, (22B) is an eccentric cam, (229) is a rotation regulating cam, and from the center of rotation of the eccentric cam (22B) to the peripheral point (228a) of the maximum ratio 1jll d s corresponding to the β mode and the VHS mode. and a peripheral point (228b) with a minimum distance d2 corresponding to are arranged at an angular interval of 180°,
A pair of recesses (229a) corresponding to β mode and VHS mode are provided on the periphery of the regulation cam (229) at an angular interval of 180°.
) and (229b) are engraved. Both cams (22B
) and (229) are the maximum and minimum distance points (228a)
and (228b) and the straight line connecting both recesses (229a) and (229b) are fixed to the rotating shaft (226) of the worm wheel (225).

(281) is an S-shaped regulation lever, and the support shaft (281) is an S-shaped regulation lever.
2) is rotatably supported by and one end (283) of the regulation lever (281) is rotationally biased clockwise by a spring (284). Regulation lever (281
) at the other end of the claw (285) fits into the recess (
229a) or (229b), and is connected to the operating rod (28B) of the plunger (287) by a connecting member (286). A micro switch (28) is installed on the side of one end (283) of the lever (281).
The lever (289a) of 9) is in contact with the push button (289b) without being pressed.

(290) is the upper plate, which includes a guide slot (291) in the width direction, a slot guide hole (292) in the longitudinal direction, and a guide slot (292) in the longitudinal direction.
3) is provided. Further, a support shaft (294) is installed on the upper surface of the upper plate (290), and a long hole (294) is installed on the lower surface of the upper plate (290).
2) and (293), and in parallel thereto, a pair of guide members (295), (296), and (297') on the left and right.
), (298) are installed. In addition, (299
) is the supply reel viewing window.

(301) and (302) are a pair of left and right cassette guide plates, each having notches (301c) and (302c).
are provided, and the bent portions (303) and (3
04) The link pins (305) and (306) and the guide pins (307) and (30B) are planted on the upper surface of the 0 guide plates (301) and (302).
The left and right guide members (295) are located below the bent portions (303) and (304).

(296) and (297'), (29B) are slidably abutted, and link bins (305) and (306) and guide bins (307) and (30B)
are inserted into the long holes (292) and (293) of the upper plate (290).

(310) shows the link as a whole and its lever (3
11) is rotatably supported by a support shaft (294) installed on the upper plate (290). A roller (313) is rotatably attached to a shaft (312) provided at one end of the lever (311). The lever (311) is rotationally biased counterclockwise by the spring (314), and the roller (313) abuts the eccentric cam (22B). A long hole (315) is provided at the other end of the lever (311), and a link pin (316) is inserted through this long hole (315) and the long hole (291) of the upper plate (290). This link pin (316) and the left and right cassette guide plates (301), (302
')'s link pins (305) and (306) are
They are connected by connecting members (317) and (318), respectively. The above is the configuration of the link (310).

When switching from VHS mode to β mode, the operation of the cassette guide mechanism is as follows.

When the β mode is set by a mode setting switch (not shown), the plunger (287) is first energized;
The claw (285) of the regulation lever (281) and the regulation cam (22)
The engagement with the fourth part (229b) corresponding to the VHS mode of 9) is released, and the displacement of the lever (289a) of the microswitch (289) causes the push 10 (289b
) is pressed to turn on the microsinch and power the motor (220). and a worm wheel (
225), the gear (227), the eccentric cam (228), and the regulating cam (229) rotate counterclockwise. When the claw (285) of the regulation lever (281) comes into contact with the periphery of the regulation cam (229) due to this rotation, the microsinch (289) is kept in the on state, so the plunger (
2B? ) is '3N! It will be deactivated for a while. Eccentric cam (228
) rotates, the distance between its center of rotation and the periphery that abuts the roller (313) increases from the shortest d2 to the longest dl.

When both cams (22B) and (229) rotate 180°, the claw (285) of the regulation lever (281) engages with the β-corresponding recess (229a) of the regulation cam (229), and at the same time the motor ( 220) is de-energized, the worm wheel (225), gear (227) and eccentric cam (220) are de-energized.
The rotation of 2B) is restricted to the position shown in FIG.

As a result of the rotation of this eccentric cam (221()), the lever (31
1) rotates clockwise around the support shaft (294) to the position shown in FIG. Move inside the elongated hole (291) from the front to the back as shown. Then, this link pin (316) and each connecting member (
The link pins (305) and (306) of the left and right cassette guide plates (301) and (302) connected by (317) and (318) are connected to the long holes (292) and (293) of the upper plate (290), respectively. the left and right cassette guide plates (301).
) and (302) are determined corresponding to the β tape cassette t1).

When switching from β mode to VHS mode, the polarity of the energization of the motor (220) is reversed by the mode setting switch (not shown), and the worm wheel (225) etc. are rotated clockwise, in the opposite manner to the above. It works, but its detailed explanation will be omitted.

Next, the structure of the cassette device will be explained with reference to FIGS. 21 and 22.

In FIG. 21, (33G) shows the cassette holder as a whole, with side plates (332) on the left and right sides of the bottom plate (331).

(333) and left and right bent parts (334), (33
5) is provided integrally. VH5 tape cassette (2
) A pair of left and right locking pieces (336) that regulate the amount of insertion.

(337) is integrally provided on the front edge of the bottom plate (331). The bottom plate (331) has a notch (33) through which the supply reel shaft (201) and take-up reel shaft (211) described above are inserted.
B) and (339) and end sensor light source (271)
A notch (340) is provided for inserting the .beta.-V HS switching protrusion (355), which will be described later.

The side 1i (332) has an opening (3) for inserting a protrusion (342) for unlocking the VH8 cassette lid (8).
43) are provided, and bent portions (334) and (335
) is an elastic piece (344) for pressing the cassette.

(345) is provided. Also, a side wall (332).

There are guide pins (346) on the outside of (333), respectively.

(347) is established.

(351) is a rocking plate, and its front edge has a pair of left and right locking pieces (
352) and (353) are integrally provided, and an opening/tuck release plate (354) of the β cassette 1 (7) is integrally provided on the side of the locking piece (352).

Further, the swing plate (351) is provided with an inclined protrusion (355). Then, the moving plate (351) is the elastic plate (35
6) Connected to °ζ base 4M (351) by (357).

In FIG. 22, (360) is a motor for loading and unloading the cassette, and a worm (360) is connected through the shaft (361).
2). The worm wheel (363) that meshes with this worm (362) has a first gear (364).
are provided coaxially, and the second. Third. The fourth and fifth gears (
365), (366), (367) and (
368) are engaged sequentially. (371) is a rotating lever for driving the cassette holter (330), and is disposed coaxially with the fifth gear (36B). An elongated hole (373) is provided at the end (372) of the rotation lever (371). (380) is an L-shaped guide groove provided on one side wall of the chassis (not shown), and the guide pin (346) installed on one side wall (332) of the cassette holder (330) is The guide groove (380) and the elongated hole (373) of the rotation lever (371) commonly pass through the Jilt. Note that the guide pin (347) of the other side wall (333) of the cassette holder (330) is also provided with the above-mentioned second gear (365) and a mechanism similar to the following.
They are connected by a rotating shaft (369) of a second gear (365).

When the cassette holder (330) is in the neo (vertical position 18) indicated by the broken line in FIG.
1).

(302) are both side walls (3) of the cassette holder (330).
32) and (333), and the bent part (3
34).

(335) are guide plates (302) and (30
1') are located within the notches (302c) and (301c).

Tape force set for β) (If 11 is inserted, I;
1) The lid lock release plate (354) of the moving plate (351') is inserted into the tape cassette l) from the notch (17) to release the lock IW of the lid (7) and lock the reels (31, (4)). Release is performed at the same time.

When a VHS tape cassette (2) is inserted,
Since the inclined protrusion (355) of the rocking plate (351) is pushed up as the cassette is inserted, the β locking piece (352)
), (353) and the lid lock release plate (354) are released downward from the bottom 4 & (331) and do not come into contact with M (8) of the VHS tape cassette (2). Further, the projection (342) on the holder side & (333) presses the lid lock release projection (20) of the tape cassette (2), and the lid (8) is unlocked.

When the tape cassette (1) or (2) is inserted and the motor (360) is energized, the driving force is transmitted through the worm (362) and the gear (368), and the rotation lever (
371) is rotated counterclockwise to the position shown. As the lever (371) rotates, the guide pin (346) first moves horizontally along the guide groove (380). At the end of this horizontal movement, the bent portions (334), (335) of the cassette holder (330) and the cassette guide plate (30)
1) Intersect with (302')! Bug is erased. The lever (371) continues to rotate and the guide pin (
346) then descends vertically along the guide groove (380). At the end point of this vertical descent, the tape cassette (1) or (2) held by the cassette holder (330) is engaged with the positioning pins (251), (252) or (261), (262) in a predetermined state, and , reel axis (201), (211) are reel (31, +
41 or +51, (engages 61.

Note that when tape unloading is complete, the motor (
360) is reversed, and the cassette holder (330) is moved back to the cassette insertion position.

The loading on the drum in the above embodiment is β
This is a case where the U loading method used in the VH5 system is adopted, but the M loading method used in the VH5 system can also be adopted. The tape running system and the loading (threading) of the tape onto the tape guide drum in this case will be described below with reference to FIG.

(172) and (173) are moving guides on the tape entrance side of the tape guide drum (70) in β mode;
72) is an upright guide, and (173) is an inclined guide.

(174) and (175) are the movement guides on the tape recording side of the drum (70) in VHS mode, (174)
is an upright guide, (175) is an inclined guide (inclined guide (173)
) and guides (with different slopes). (176).

(177) is a drum (70
) is a moving guide on the tape exit side, (176) is an inclined guide, and (177) is an upright guide. Therefore, the guide (172), (173) or (174),
(175) and guides (176) and (177) are connected to the tape (23) or (24) from the cassette (not shown).
is pulled out and wrapped around the drum (70). (170
), (171).

(178) and (179) are fixed guides.

(180) is a capstan, and (,181) is a pinch roller.

Next, the running path of the tape wound around the drum (70) will be explained. The tape (23) or (24) fed out from the supply reel (not shown) is guided by the guide (1).
70) - Guide (171) - Full width erase head (149)
After the β tape (23) passes through the guide (172)
- (173), the VHS tape (24) passes through the guide (174), (175), and then the drum (
70). The tape (23) or (24) coming out of the drum (70) is connected to the guide (176) - guide (1).
77)-β, VH3 common audio erasing head (151A)
-β voice/control head (151B) -vHs
Audio/control head (151G) - Guide (17
B) - Capstan (180) and pinch roller (18)
1) - The film is wound onto a take-up reel (not shown) through the path of the guide (179).

surface, guide' (172), (173) and guide (
174).

Use the same guide as (175), change the flJff slope of guide (173) and (175) with β and VH5 seven-mode, or use a separate guide and move the unused guide to use selectively. I'll do what I do.

In this case as well, the drum (70) is placed at a predetermined position in the tape width direction of the tape exit section (the tape exit section is also possible), for example, around an axis that passes through its center and is orthogonal to the axis of the drum (70). 70) is rotated by the difference between the tape lead angles of β and VHS.

The rest of the configuration is similar to the VTR of the above-described embodiment.

〔Effect of the invention〕

According to the present invention described above, the configuration of the tape guide drum is W.
To obtain a magnetic recording and reproducing device that can be used with tape cassettes of two different types of magnetic recording and reproducing devices by making the height small in an I-car, and by making most of the tape running system common. be able to.

[Brief explanation of drawings]

1 and 2 are perspective bottom views showing a tape cassette of a β and VHS type magnetic recording and reproducing device that can be used in the magnetic recording and reproducing device according to the present invention. 5 and 5 are a plan view and a perspective view showing the tape running system of a conventional β-type magnetic recording and reproducing device, and a plan view showing the tape loading process, and FIG. 6 is a conventional VHS-type magnetic recording and reproducing device. FIGS. 7, 8 and 9 are a perspective view showing a tape running system of the present invention, and FIGS. The figure is a plan view showing a part of the tape guide drum device shown in FIGS. 7 to 9, and FIGS. 11 and 12 are partial cross-sectional views of various parts of the tape guide drum device shown in FIGS. Fig. 13 is a linear plan view of the tape guide drum of the small guide drum device of Figs. 7 to 9;
Figure 4 is a neo plan view of the tape running system of an embodiment of the magnetic recording/reproducing apparatus according to the present invention, and Figures 15 and 16 are the
4 is a perspective view showing the operating state of a part of the tape running system in FIG. 4;
17 and 18 are perspective views showing the operating state of the cassette mounting mechanism of an embodiment of the magnetic recording and reproducing apparatus according to the present invention, and FIGS. 19 and 20 are perspective views showing an embodiment of the magnetic recording and reproducing apparatus according to the present invention. FIG. 21 is a perspective view of a cassette holder in an embodiment of the magnetic recording/reproducing apparatus according to the present invention, and FIG. 22 is a side view showing the drive mechanism of the cassette holder. , FIG. 23 is a plan view showing a tape running system of another embodiment of the magnetic recording/reproducing apparatus according to the present invention. (69) is the tape guide drum device, (70) is the tape guide drum, (71) is the rotating upper drum, (72) is fixed)
drum, H is a rotating magnetic head, (73) is a tilted lead guide for β, (74) is a tilted lead guide for VH3, (
75) is the base, (76) is the gear, (81) is the pedestal, (8
2) is a roller, (86) to (88) are springs, (Do)
, (91) is a gear, (92) is a gear column, (95) is a worm, (96) is a motor, and (100) is a plunger. '-mij-'・' Figure 6 Figure 8 Figure 9 Figure 15

Claims (1)

[Claims] A tape guide drum having a rotating head, first and second tape lead angle determining means provided at different positions on a fixed drum of the tape guide drum, and an axis of the tape guide drum and tape winding relative to the tape guide drum. Among the axes of the entrance and exit guide means for regulating the angle of attachment, the angles formed by the other two axes with respect to one axis are determined relative to each other in relation to the selection of the first and second tape lead angle determining means. 1. A magnetic recording and reproducing device comprising: angle switching means for switching between different angles.