JPH01130355A - Driving power transmission mechanism for tape loading mechanism - Google Patents

Abstract

PURPOSE:To bar the increase of the load of a motor and the larger sizing of the motor by providing the cam follower displacing a fulcrum so that a 1st lever and a 2nd lever may become in about straight line at the time when a pair of tape drawing means are moved to a 2nd position. CONSTITUTION:The 1st lever 26 whose one end is turnably supported by a sector gear 6, the 2nd lever 28 whose one end is turnably supported by a fixed bearing shaft, the fulcrum 30 respectively linking the other end of the 1st lever 26 and that of the 2nd lever 28 and the cam follower 31 displacing the fulcrum 30 so that the 1st lever 26 and 2nd lever 28 may become in about straight line at the time when a pair of tape drawing means 48, 49 are moved to a 2nd position are equipped with. The repulsive force by the energizing means which the sector gear 6 receives at the time when tape loading is completed is received by the fixed bearing shaft 29 supporting the 2nd lever 28 turnably with the 1st lever 26 and 2nd lever 28 becoming in about straight line. The miniaturization of a motor is thus enabled without giving any load on the driving source of the cam driving the sector gear 6.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention is a magnetic recording/reproducing device in which a magnetic tape is pulled out from a cassette mounted at a mounting position and is wound diagonally over a predetermined angle around a cylinder equipped with a magnetic head. The present invention relates to a driving force transmission mechanism for a tape loading mechanism.

(b) Conventional technology Generally, in the tape loading mechanism disclosed in Japanese Patent Application Laid-Open No. 59-113567, the driving force of a motor that can rotate in both forward and reverse directions is transmitted to a cam gear and driven by the cam gear. The cam follower rotates a gear rotatably supported on a base, and the gear transmits driving force to a pair of loading gears, each of which is provided with a pair of loading arms. Since each part is connected to a pair of tape drawer members, the pair of tape drawer members are respectively slid within a pair of guide grooves provided in the base to draw out the magnetic tape from the cassette and to the cassette. The magnetic tape is stored. For example, when the motor rotates in the loading direction, the pair of tape drawer members+4 slide within the guide groove in the direction to pull out the magnetic tape from the cassette, and the magnetic tape is transferred to a cylinder equipped with a magnetic head. When the winding starts and the motor rotates in the same direction, the pair of tape drawers completes the winding of the magnetic tape around the cylinder at a predetermined angle, and the pair of tape drawers are installed at the end of the guide groove. However, the motor continues to rotate in the same direction, displacing the springs interposed between the pair of loading gears and the pair of loading links by a predetermined amount, and pulling out the pair of tapes. By stopping the rotation of the motor and completing the tape loading operation with the holder pressed against the fixing member, the positioning of the pair of tape drawer guides and the rattling of the pair of tape drawer guides can be prevented. This prevents the tape path of the magnetic tape from being disturbed.

(c) Problems to be Solved by the Invention In the tape loading mechanism disclosed in the above-mentioned publication, when tape loading is completed, a pair of tape pulling means is pressed against a fixed part provided at the end of the guide groove. In order to maintain this state, the spring that connects the pair of loading arms and the pair of loading gears is kept elastically deformed, or for example, after tape loading is completed, the motor is further rotated in the loading direction, and the pinch roller is crimped. When performing this, the reaction force of the spring acts as a load on the motor, which increases the load on the motor, leading to an increase in the size of the motor, resulting in an increase in cost and an impediment to space saving.

(d) Means for Solving the Problems The present invention has been made to solve the above problems, and it is necessary to set the magnetic tape wound in a cassette at a first position where the magnetic tape is pulled out and at a predetermined position in the cylinder. A tape loading device comprising: a guide groove having a second position for obliquely wrapping the tape over an angle; a pair of tape pull-out means sliding within the guide groove with a driving force transmitted to a sector gear; and a cam driven by the sector gear. In the mechanism, a first lever rotatably supported at one end by the sector gear, a second lever rotatably supported at one end by the fixed support shaft, and the first lever.
and a fulcrum that connects the other end of the lever and the other end of the second lever, respectively, and a fulcrum that connects the other end of the lever and the other end of the second lever, and when the front two pairs of tape pulling means move to the second position, the first lever and the second lever The above problem is solved by a driving force transmission mechanism including a cam follower that displaces the fulcrum so that the lever becomes substantially straight.

(E) Function In the driving force transmission mechanism of the tape loading mechanism of the present invention, the pair of tape pulling means winds the magnetic tape obliquely over a predetermined angle around the cylinder from the first position for pulling out the magnetic tape wound around the cassette. When the sector gear slides in the guide groove to a second position and is held in the second position, the reaction force applied to the sector gear is fixed to the first lever whose one end is supported by the sector gear. A second lever, one end of which is supported by a support shaft, extends the other end of the first lever and the other end of the second lever so that the second lever is substantially parallel to and substantially straight with the tangential direction of the sector gear. A fulcrum to be connected is displaced by a cam follower, and a reaction force applied to the sector gear is received by the fixed support shaft.

(f) Example The driving force transmission mechanism of the tape loading mechanism of the present invention will be explained according to the drawings in Figs. 1, 2, and 3.
Each figure is a plan view showing one operating state of the driving force transmitting mechanism of the tape loading mechanism of the present invention, and FIGS. 4, 5, and 6 are respectively FIGS. Third
1, 2, and 3 showing the position of the cam in the operating state shown in the figure, and FIG. 7 is a plan view of the main part of a tape loading mechanism using the same driving force transmission mechanism. . For convenience, the cassette is shown by a dotted line and the magnetic tape is shown by a two-dot chain line, and the chassis is shown as transparent in FIG.

To explain the symbols and configurations of FIGS. 1 to 7,
(1) is a cassette, (2) is a magnetic tape wound around a pair of reels (3a) (3b>) housed in the cassette (1), and (4) is a magnetic tape (2) that is wound at a predetermined angle. The cylinder to be wrapped, (5) is the chassis, (6) is a sector gear rotatably supported on a support shaft (7) provided on the back surface of the chassis (5), and (8) is rotatable in both forward and reverse directions. A drive motor (9) is a worm gear that rotates by transmitting the driving force of the drive motor (8) via a belt (10), and (11) meshes with the worm gear (9) and is connected to the chassis (5). A worm wheel (13) rotatably supported on a spindle (12) provided therein meshes with a gear portion (14) provided on the worm wheel (11) and rotates on a rotation spindle (15). cam gear, (1
6) (17) is a first cam groove and a second cam groove provided on the front and back surfaces of the cam gear (13), respectively; (18)
) (19) respectively correspond to the first cam groove (16) and the second cam groove (16).
A first pin (20) and a second pin (21) to be fitted into the cam groove (17) of the chassis (5) are respectively planted.
A first support shaft (22) and a second support shaft (23) provided in
) are each rotatably supported by a first rotating member and a second rotating member.
The rotating member (24) has one end connected to the second rotating member (19).
) a rod-shaped member engaged with an engaging portion (25) provided in the
(26) is a first lever whose one end is rotatably supported by a protrusion (27) provided on the sector gear (6);
8) is a second lever whose one end is rotatably supported by a fixed support shaft (29) provided on the back surface of the chassis (5);
(30) is the other end of the first lever (26) and the second end of the lever (26).
A fulcrum (31) is connected rotatably to the other end of the lever (28) and engaged with the other end of the rod-shaped member (24); Component (24)
a cam follower that displaces the fulcrum (30) so that the first lever (26) and the second lever (28) form a substantially straight line; a first loading gear integrally provided with a gear (34) that is movably supported and meshed with the sector gear (6);
(35) is the first loading link, (36) has one end locked to a locking piece (37) provided on the first loading link (35), and the other end to the first loading gear (36). A first spring (39), which is engaged with a pin (38) erected on a shaft (34), is rotatably supported by a support shaft (40) and meshes with the first loading gear (32). The second loading gear (41) is the support shaft (
a second loading link (42) rotatably supported by the second loading link (40);
1), and the other end is fixed to the second loading gear (39).
44), the second spring (45a) is locked to (44);
5a) each have one end connected to the first loading link (3).
5) and a first link and a second link (48) rotatably connected to the second loading link (41) at a first fulcrum (46) and a second fulcrum (47), respectively.
) (49) at the other ends of the first link (44) and the second link (45) with a first rotation support shaft (50) and a second rotation support shaft (51), respectively. A first tape pull-out member and a second tape pull-out member (52) and (53) as a pair of rotatably connected tape pull-out means are respectively provided in the chassis (5), and are connected to the cassette (1). a first position (54) where the magnetic tape (2) is pulled out (
55) and a second position (56) (57) where the magnetic tape (2) is wound around the cylinder (4) at a predetermined angle.
and a first guide groove and a second guide groove in which the first tape pull-out member (48) and the second tape pull-out member (49) can respectively slide, (58) (59) )
are provided at the second positions (56) and (57), respectively,
The catcher 1 (6o), which restricts the sliding movement of the first tape pull-out member (48) and the second tape pull-out member (49), is a catcher 1 (6o) with which the magnetic tape (2) can slide.
CE head, (61) is a capstan motor which is a driving source for running the magnetic tape (2), (62) is a capstan shaft which is a rotating shaft of the capstan motor (61), and (63) is a capstan motor that is a driving source for running the magnetic tape (2). A pinch roller (64) that can be pressed against the stun shaft (62) has one end attached to the pinch roller (63).
), the arm member is rotatably supported by a support shaft (65) provided on the chassis (5);
6) is a long hole (67) in which a protrusion (68) planted on the first rotating member (18) is fitted, and the chassis (5)
A slide member (71) is guided by the guide pins (69a) (69b) and moves horizontally by fitting the guide pins (69a) (69b) planted in the grooves (70a) (70b), respectively. ) has one end attached to the arm member (64).
It is a tension spring that is locked to a locking piece (72) provided on the slide member (66), and the other end is locked to a locking piece (73) provided on the slide member (66).

Next, the mode transition operation from the stop mode to the recording mode or the reproduction mode of the magnetic recording/reproducing apparatus using the driving force transmission mechanism of the tape loading mechanism of the present invention will be explained. (13) rotates by a predetermined angle in the clockwise direction in FIGS. 1 and 4 about the rotation support shaft (15), and the cassette loading operation is completed, and the first pin (20) and the second The bottle (21) is located in the first cam groove (16) shown in Fig. 4.
The cam follower (31), which is located at the position of the second cam groove (17) and is driven by the displacement of the second cam groove (17), maintains the fulcrum (30) at the position shown in FIG. Therefore, the sector gear (6) is not rotating in the counterclockwise direction in FIG. ) are located at the first positions (54) and (55) of the first guide groove (52) and the second guide groove (53), respectively, and the magnetic tape (2) is still pulled out from the cassette (1). while the first cam groove (16)
The slide member (66) driven by the displacement of the pinch roller (63) keeps the pinch roller (63) spaced apart from the capstan shaft (62).

Here, the operation panel (
When a record button (not shown) or a playback button (not shown) is pressed, the drive motor (8) starts rotating in the direction of arrow A.
The worm gear (9), to which the rotational force of the drive motor (8) is transmitted via the bell (10), also rotates in the direction of arrow A, and rotates the worm wheel (11) around the support shaft (12). The cam gear (13) is meshed with a gear part (14) provided on the worm wheel (11), so the rotation support shaft (15) is rotated counterclockwise in the figure.
) in the clockwise direction in FIG.
The second pin (21) is implanted in order to displace the second cam groove (17) in the direction approaching the rotating shaft (15) due to the rotation of the cam gear (13). The upright second rotating member (19) rotates counterclockwise in FIG. 1 about the second support shaft (23), and the second rotating member (19) ) and the engaging part (
Since the other end of the rod-shaped member (24) is engaged with the fulcrum (30), the rod-shaped member (
24) displaces the fulcrum (30) in the direction of the arrow B, and the second reno <- (28) displaces the fulcrum (30) in the direction of the arrow B. 1, the - direction first lever (26) is displaced so as to form a substantially straight line with the second lever - (28),
The first lever (26) has one end connected to the sector gear (6).
), the sector gear (6) can be rotated counterclockwise in FIG. 1 about the support shaft (7), and the sector gear (6) meshes with the gear (34), so if the first loading gear (32) is rotated clockwise in FIG. 1 around the spindle (33), the first loading link ( 35) rotates clockwise in FIG. 1 around the support shaft (33) and transmits driving force to the first tape drawer member (48) via the first link (45a). , the first tape drawer puller 2 (48) pulls out the magnetic tape (2) from the cassette (1) while moving it to the first position (5) of the first guide groove (52).
4) toward the second position (56) in the first guide groove (52), and the first tape drawer member (4)
8) reaches the second position (56), winds the magnetic tape (2) obliquely around the cylinder (4) at a predetermined angle, and even when it comes into contact with the catcher (58), the sector gear ( 6) rotates counterclockwise around the support shaft (7), elastically deforms the first spring (36) by a predetermined amount, and moves the first tape drawer sister a (4S) to the catcher ( 58), and on the other hand, since the first loading gear (32) meshes with the second loading gear (39), the second loading gear (39)
a second loading link (41) that rotates counterclockwise in FIG. 1 around a support shaft (40) and is connected to the second loading gear (39) by a second spring (42); is the second loading gear (
39) in the counterclockwise direction in FIG. When the second tape drawer member (49) pulls out the magnetic tape (2) from the cassette (1) in synchronization with the first tape drawer member (48),
The second guide groove (53) moves from the first position (55) to the second position (57) of the second guide groove (53).
), the second tape drawer member (49) reaches the second position (57), and the magnetic tape (2
) is wound diagonally around the cylinder (4) at a predetermined angle and brought into contact with the ACE head (60), and even if it abuts against the catcher (59), the sector gear (6) is still centered around the spindle (7). The second
The spring (42) of the second spring is elastically deformed by a predetermined amount.
The tape drawer member (49) of the catcher (59)
).

The above state is the tape loading completion state shown in FIG. 2, and as shown in FIG. 5, the second cam groove (17)
Due to the shape, the second pin (21) has completed its displacement in the direction approaching the rotational support shaft (15) within the second cam groove (17), and the B arrow of the rod-shaped member (24) direction, the first lever (26) and the second lever (28) are kept in a substantially straight line, and the first tape drawer member (48) and the second lever Each tape drawer member (49) has a catcher (58) (
The first spring (36) when pressed against the spring (59)
The reaction force generated by the second spring (42) acts in a direction to rotate the sector gear (6) clockwise in FIG. Since the first lever (26) and the second lever (28) are substantially in a straight line, the reaction force is applied to the fixed support shaft (29).
Therefore, the load on the second cam groove (17) of the cam gear (13) is minimal.

Further, the drive motor (8) rotates in the direction of arrow A, and if the cam gear (13) is further rotated clockwise in FIG. 2 around the rotational support shaft (15), the second pin ( 21) slides on the concentric portion of the second cam groove (17), so the cam 7 lower (3) does not change its position.
1) is maintained in a state where tape loading is completed, while the first pin (20) fitted into the first cam groove (16) moves inside the first cam groove (16). a first rotation member (displaced in a direction away from the rotation support shaft (15) and having the first pin (20) planted thereon;
18) rotates in the counterclockwise direction in FIG. 2 about the first support shaft (22), and the protrusion (68) is inserted into the elongated hole ( 6'7) and the guide pins (69a) (6'7) are inserted into the grooves (79a) (70b).
The slide members (66) into which the guide pins (69a) are fitted are rotated counterclockwise about the first support shaft (22) of the first rotation member (18).
) (69b), and is connected to the slide member (66) by a tension spring (71).
66) in the direction of arrow C, the pinch row 9 rotates about the support shaft (65) in the counterclockwise direction in FIG.
(63) is brought into contact with the capstan shaft (62) with the magnetic tape (2) sandwiched therebetween, and the slide member (66) is further moved in the direction of arrow C to place the tension spring (71) in place. After a certain amount of elastic deformation, the pinch roller (6
3) is brought into pressure contact with the capstan shaft (62), the slide member (66) moves in the direction of arrow C due to the shape of the first cam groove (16) shown in FIG. After completing the movement, the drive motor (
8) stops the rotation in the direction of arrow A, drives the capstan motor (61) to run the magnetic tape (2), and rotates the cylinder (4) at a predetermined speed, so that the magnetic recording/reproducing device is set to recording mode or playback mode.

The above is the mode transition operation from the stop mode to the recording mode or the reproduction mode of the magnetic recording/reproducing apparatus using the driving force transmission mechanism of the tape loading mechanism of the present invention. In addition, if the rod-shaped member (24) is buckled by a predetermined amount in the state shown in FIG. As a result, the first tape pull-out member (48) and the second tape pull-out member (49) are moved into the first guide groove (52) and the second guide groove (53), respectively. ) can be held in a crimped state at the first position (54) (55).

(G) Effects of the Invention According to the driving force transmission mechanism of the tape loading mechanism of the present invention, the reaction force from the biasing means that is received by the sector gear at the time when tape loading is completed is transferred between the first lever and the second lever. becomes substantially straight, and the second lever is driven by a fixed support shaft that rotatably supports it, making it possible to press the pinch roller, etc., making it possible to downsize the motor, save space, and It can contribute to cost reduction.

[Brief explanation of the drawing]

1, 2 and 3 are plan views showing one operating state of the driving force transmission mechanism of the tape loading mechanism of the present invention, and FIGS. 4, 5 and 6 are respectively shown in FIG. FIGS. 2 and 3 are plan views of the main parts, and FIG. 7 is a plan view of the main parts of a tape loading mechanism using the same driving force transmission mechanism. (1)...Cassette, (2)...Magnetic tape,
(4)...Cylinder, (6)...Sector gear, (8)...Drive motor, (13)...Cam gear, (17)...Second cam groove, (26)...・First lever, (28)...Second lever, (29
)...fixed support shaft, (30)...fulcrum, (3
1)...Cam follower, (48)...First tape pull-out member, (49)...Second tape pull-out member.

Claims (1)

[Claims] 1. A guide groove having a first position for pulling out the magnetic tape wound on the cassette and a second position for winding the magnetic tape obliquely around the cylinder at a predetermined angle, and a driving force for driving the sector gear within the guide groove. In the tape loading mechanism, the tape loading mechanism includes a pair of tape pull-out means that are slidable by being transmitted with the tape, and a cam that drives the sector gear. a rotatably supported second lever, a fulcrum connecting the other end of the first lever and the other end of the second lever, and a pair of tape pull-out means in the second position. A driving force transmission mechanism comprising: a cam follower that displaces the fulcrum so that the first lever and the second lever become substantially straight when moved.