JP2983953B2 - Tape loading device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tape for winding a magnetic tape around a rotary head cylinder installed on a chassis in a magnetic recording and reproducing apparatus such as a VTR (video tape recorder) and a DAT (digital audio tape recorder). The present invention relates to a loading device.

[0002]

2. Description of the Related Art Conventionally, for a VTR, a tape loading apparatus as shown in FIG. 10 has been proposed (for example, see Japanese Patent Application Laid-Open No. 62-36771). That is, a cylinder base (71) for mounting a rotary head cylinder (not shown) is installed on the chassis (7), and a pair of right and left extending around the cylinder base (71) is provided on the chassis (7). Leading guide block guide grooves (72) (72) are provided. A leading guide block (9) for wrapping the magnetic tape of the tape cassette around the rotary head cylinder is slidably engaged with each leading guide block guide groove (72). Each leading guide block (9) is driven along a leading guide block guide groove (72) by a drive mechanism (not shown), and moves between a tape loading start position on the tape cassette side and a tape loading completion position on the rotary head cylinder side. To reciprocate.

The leading guide block (9) has a vertical post
(94) and an inclined post (95), and the chassis
A V-shaped groove (91) is formed on the front side of (7) and a U-shaped groove (92) is formed on the back side of the chassis (7), and a V-shaped groove (91) and a U-shaped groove (92) are further formed.
A recess (93) is formed between them. Meanwhile, the chassis
(7) A catcher mechanism for receiving each leading guide block (9) at the tape loading completed position.
(8) is deployed. The catcher mechanism (8) is formed integrally with the cylinder base (71) by aluminum die casting or the like, and has a V-shaped groove (9) of the leading guide block (9).
1) and catcher pin (81) to be engaged with U-shaped groove (92)
And a convex portion (82) to be fitted into the concave portion (93) of the leading guide block (9).

When the leading guide block (9) is driven from the tape loading start position to the tape loading completion position by the driving mechanism, the leading guide block (9) is driven.
The V-shaped groove (91) and U-shaped groove (92) of (9) are the catcher mechanism.
By contacting the catcher pin (81) of (8), the position along the traveling direction of the leading guide block (9) is defined,
The left and right inclination of the leading guide block (9) is regulated.
Also, the upper surface of the concave portion (93) of the leading guide block (9) abuts on the lower surface of the convex portion (82) of the catcher mechanism (8), and the inclination of the leading guide block (9) before and after along the traveling direction is regulated. It is done.

The leading end of the leading guide block guide groove (72) has a large opening for incorporating the leading guide block (9) into the leading guide block guide groove (72) at a position overlapping with the catcher mechanism (8). In the assembling process of the tape loading device, the leading guide block (9) is assembled into the chassis (1) by using the opening, and then the catcher mechanism (8) is attached to the chassis (7). Attach. Thereby, the tape loading completion position of the leading guide block (9) is defined.

[0006]

In the construction in which the catcher mechanism (8) is integrally formed with the cylinder base (71) as shown in FIG. 10, since the mold has a large and complicated shape, it is difficult to manufacture. There was a problem that cost increased. Then, the applicant attaches the catcher pin (81) to the chassis (7).
Burring was press-fitted directly into the chassis and fixed to the chassis (7). However, in this case, since the catcher pin (81) is erected at a position distant from the end of the leading guide block guide groove (72), the leading guide block is located at the end of the leading guide block guide groove (72). There is a problem that a large opening for assembling cannot be formed.

An object of the present invention is to disassemble the leading guide block by a simple operation without increasing the number of parts.
An object of the present invention is to provide a tape loading device having a structure that can be assembled.

[0008]

A tape loading device according to the present invention is a leading guide block guide groove (3) formed in a chassis (1) surrounding a rotary head cylinder (11).
And a guide guide block (4) which slidably engages with the guide groove (3) of the leading guide block and moves from a tape loading start position to a tape loading completion position to wind the magnetic tape around the rotary head cylinder (11). When,
Insert the leading guide block (4) into the leading guide block guide groove.
And a drive mechanism (5) that reciprocates along (3). The drive mechanism (5) connects the distal end of the driving lever (51) to the base end of the driven lever (52) and connects the distal end of the driven lever (52) to the leading guide block (4). It has a link mechanism. Also, the leading guide block guide groove (3)
Is a leading guide block driven by the driving mechanism (5).
The loading groove (31) for reciprocating (4) between the tape loading start position and the tape loading completion position, and the driven lever (52) with the drive lever (51) of the drive mechanism (5) kept stationary. Auxiliary groove for retracting the leading guide block (4) at the tape loading start position to the leading guide block assembling position by swinging.
(32), and the leading guide block (4) can be incorporated into the leading guide block guide groove (3) at the leading guide block assembling position.

In the tape loading device of the present invention, the leading guide block (4) is moved along the auxiliary groove (32) of the leading guide block guide groove (3) between the leading guide block assembling position and the tape loading start position. To reciprocate between the tape loading start position and the tape loading completion position along the loading groove (31) of the leading guide block guide groove (3). Here, the loading groove (31) of the leading guide block guide groove (3) is used exclusively for a tape loading operation for winding a magnetic tape around the rotary head cylinder (11), whereas the auxiliary groove (32) is used. , Exclusively used in the assembly and disassembly processes of the device.

For example, in the assembling process of the apparatus, the leading guide block (4) is connected to the leading guide block guide groove at the starting position of the auxiliary groove (32) of the leading guide block guide groove (3), that is, at the position where the leading guide block is assembled. In addition to (3), the leading end of the driven lever (52) of the drive mechanism (5) is connected to the leading guide block (4). Here, the auxiliary groove portion (32) of the leading guide block guide groove (3) connects the leading guide block (4) at the position where the leading guide block is assembled to the chassis (1).
Has a notch (33) corresponding to, for example, a convex portion of the leading guide block (4), so that the leading guide block (4) ) Can be incorporated.

Next, while the driving lever (51) of the driving mechanism (5) is stationary, the driven lever (52) is swung to move the leading guide block (4) into the leading guide block guide groove (3). The tape is advanced along the auxiliary groove (32) and moved to the tape loading start position. Here, the drive mechanism (5) may swing only the driven lever (52), and the driving mechanism
It is not necessary to operate the reduction mechanism leading to (51). As a result, the leading guide block (4) is slidable along the leading guide block guide groove (3), and is engaged with the leading guide block guide groove (3) so as not to fall off.
The incorporation of (4) ends. In the tape loading operation, since the leading guide block (4) reciprocates only in the loading groove (31) of the leading guide block guide groove (3), it does not separate from the leading guide block guide groove (3). .

In a specific configuration, a leading guide block
(4) includes a shaft (48) slidably fitted in the leading guide block guide groove (3), and the shaft (48) is connected to the driven lever (52) of the drive mechanism (5). It is eccentric to the front side of the leading guide block guide groove (3) from the point P1. In this specific configuration, the sliding contact between the shaft portion (48) of the leading guide block (4) installed at the tape loading start position and the side wall of the leading guide block guide groove (3) is formed by the leading guide block (4).
Is moved forward along the leading guide block guide groove (3) than the sliding contact point in the configuration in which the shaft portion (48) is arranged concentrically with the connection point P1 with the driven lever (52) of the drive mechanism (5). become. As a result, at the time of tape loading start, the angle between the direction of action of the driving force received by the leading guide block (4) from the drive mechanism (5) and the direction in which the leading guide block guide groove (3) extends becomes smaller, and the drive Force component in the groove direction,
That is, the propulsive force for the leading guide block (4) increases. Therefore, the movement of the leading guide block (4) starts smoothly.

Further, in a specific configuration, the chassis (1)
On the top, the auxiliary groove (32) of the leading guide block guide groove (3)
A member to perform a predetermined function other than tape loading is removably assembled in the vicinity of, and the member allows the leading guide block (4) to retreat from the tape loading start position to the leading guide block assembling position. Will be blocked. In this specific configuration, when the leading guide block (4) is assembled into the leading guide block guide groove (3) in the assembling process of the apparatus, the above-mentioned members are removed from the chassis (1). In this state, the leading guide block guide groove
Leading guide block (4) using the auxiliary groove (32) of (3)
And move the leading guide block (4) to the tape loading start position. Then, the above member is attached to the chassis (1). After the above members are attached, even if the leading guide block (4) does not move from the loading groove (31) of the leading guide block guide groove (3) to the auxiliary groove (32), the leading guide block (4) will not move. The leading guide block (4) does not come off from the leading guide block guide groove (3) because the guide block (4) comes into contact with the member and is prevented from moving.

[0014]

According to the tape loading device of the present invention, the guide groove (3) is provided with the auxiliary groove (32).
By simply adding, the leading guide block (4) can be assembled, so that the number of parts does not increase.
When the leading guide block (4) is incorporated into the leading guide block guide groove (3) or when the leading guide block (4) is detached from the leading guide block guide groove (3), the driven lever of the drive mechanism (5) is simply used. Just swing (52),
The operation is simple because it is not necessary to operate the entire driving mechanism (5).

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to a tape loading device of a VTR will be specifically described with reference to the drawings. As shown in FIGS. 1 and 2, in a tape loading device (12) according to the present invention, a chassis (1) on which a rotary head cylinder (11) is mounted is mounted on a left and right side extending around the rotary head cylinder (11). A pair of leading guide block guide grooves (3) and (3) are provided, and a catcher pin (2) is provided at the end side of each leading guide block guide groove (3) vertically to the chassis (1). Has been established.
The catcher pin (2) is, as shown in FIG.
And a thin shaft portion (22). Meanwhile, chassis (1)
The burring process is applied to the chassis (1).
A cylindrical portion (15) projecting downward from the rear surface of the cylindrical portion (15) is formed, and a catcher pin (2) is inserted into a through hole (16) of the cylindrical portion (15).
The thin shaft portion (22) is press-fitted (burring press-fit) to
The outer peripheral surface of (22) is pressed against the inner peripheral surface of the through hole (16).

As shown in FIGS. 1 and 2, a drive mechanism (5) arranged on the back side of the chassis (1) is connected to the two guide blocks (4) and (4). The driving mechanism (5) includes a pair of driving levers (51) (51) to which rotation is transmitted from a loading motor (not shown) via a deceleration mechanism, and a driven lever (52) is provided at the tip of each driving lever (51). ) Is connected, and the distal end of the driven lever (52) is connected to the leading guide block.
Connected to (4). As shown in FIG. 7, the driving lever (51) includes a gear portion (55) and a lever portion (54), and the rotation is transmitted to the gear portion (55). By driving the loading motor, the pair of driving levers (51) (51)
As shown by the arrow inside, they rotate in opposite directions, and accordingly, the link mechanism including the driving lever (51) and the driven lever (52) rotates from the state of FIG. 1 to the state of FIG. The leading guide block (4) is pushed from the tape loading start position in FIG. 1 to the tape loading completion position in FIG.

Each leading guide block guide groove (3) is shown in FIG.
And a loading groove (31) for reciprocating the leading guide block (4) between a tape loading start position (see FIG. 1) and a tape loading completion position (see FIG. 2), as shown in FIG. The auxiliary groove (32) for reciprocating the block (4) between a tape loading start position (see FIGS. 1 and 4) and a leading guide block assembling position (see FIG. 5). ) Has a notch (33) formed therein to form an opening corresponding to the contour of the leading guide block (4) at the position where the leading guide block is assembled. As described later, the leading guide block (4) can be incorporated into the leading guide block guide groove (3) by utilizing this opening. The auxiliary groove portion (32) of the leading guide block guide groove (3) is specifically, as shown in FIG. 4 and FIG.
With the drive lever (51) of the drive mechanism (5) stationary,
When the driven lever (52) is swung about (56), the lever tip extends along an arc drawn by the lever.

In the assembled state (completed product) of the VTR, as shown in FIGS. 1 and 2, on the chassis (1), near the starting end of the guide groove (3) on the left side, the magnetic tape is fixed. Tension lever (1
3) is provided, and a brake lever (14) for applying a brake to a reel base (not shown) is provided near the starting end of the right guide block guide groove (3). Each of the levers (13) and (14) partially overlaps the auxiliary groove (32) of the guide groove (3), so that the leading guide blocks (4) and (4) at the tape loading start position do not recede. However, the leading guide blocks (4) and (4) abut against these levers (13) and (14) to prevent retreat.

As shown in FIGS. 4, 5 and 7, the leading guide block (4) is attached to a base (44) made of resin.
The front shaft portion (40) and the rear shaft portion (4) projecting downward from the back surface of (44) and slidably fitted in the leading guide block guide groove (3).
8), a boss (43) protruding from the lower end surface of the rear shaft (48),
A pair of projections (4) projecting outward from both sides of the base (44)
5) (46), a locking piece (47) protruding toward the driven lever (52) on the protruding piece (46) on the rotating head cylinder (11) side, and an upper end of the front shaft (40). First protruding piece (6) projecting forward from the
And a second protruding piece (62) projecting forward from the lower end of the front shaft part (40).
A V-shaped groove (61) opening forward is formed in (6), and a U-shaped groove (63) opening forward is formed in the second protruding piece (62). A vertical post (41) and an inclined post (42) are erected on the base portion (44).

The boss (43) of the leading guide block (4) is rotatably connected to the tip of the driven lever (52). The pair of projecting pieces (45) and (46) project further outward than both side walls of the leading guide block guide groove (3) as shown in FIG.
It slides on the back surface of (1) and prevents the leading guide block (4) from coming off from the leading guide block guide groove (3) upward. The locking piece (47)
The sliding lever comes into sliding contact with the back surface of a tongue piece (53) formed at the tip of the driven lever (52), and holds the driven lever (52) so as not to fall off the boss (43) (FIG. 7). reference).

The rear shaft portion (48) of the leading guide block (4) is connected to a driven lever of a driving mechanism (5) as shown in FIG.
It has a center P2 at a position eccentric to the front side of the leading guide block guide groove (3) from the center point P1 of the boss (43) connected to (52). As a result, the sliding contact S2 between the shaft portion (48) of the leading guide block (4) installed at the tape loading start position and the side wall of the leading guide block guide groove (3) is brought into contact with the shaft portion of the leading guide block (4). (48) Boss (4
In the configuration (circle C shown by a dashed line in the figure) arranged concentrically with 3), the sliding contact S1 with the groove side wall moves forward along the groove side wall.

That is, as shown in FIG. 6, the angle θ2 formed by the straight line F2 connecting the connecting point P0 of the driving lever (51) and the driven lever (52) with the sliding contact S2 with the tangent S is equal to the sliding point of the connecting point P0. Contact S
1 is smaller than the angle θ1 between the straight line F1 and the tangent line S. Accordingly, when the leading guide block (4) is driven forward from the tape loading start position shown in FIG. 6, the driving force received by the leading guide block (4) in the groove direction, that is, with respect to the leading guide block (4). Propulsion will increase. As a result, the leading guide block (4)
Starts moving smoothly.

In particular, when the leading guide block guide groove (3) is formed from the loading groove (31) and the auxiliary groove (32),
At the position where the two grooves (31) and (32) are connected, the tangential direction of the groove side wall slightly changes due to the formation of the auxiliary groove (32), and the tangential component of the driving force by the driving mechanism (5) decreases. There is. In this case, there is a possibility that the advance of the leading guide block (4) may not be started smoothly, but as described above, the rear shaft portion (48) of the leading guide block (4) is attached to the boss (4).
By eccentric to 3), this problem can be solved.

When the driving mechanism (5) is driven, the leading guide block (4) moves along the loading groove (31) of the leading guide block guide groove (3), and reaches the tape loading completion position shown in FIG. 7 and 9, the V-shaped groove of the first protruding piece (6) of the leading guide block (4).
(61) is pressed against the thick shaft portion (21) of the catcher pin (2), and at the same time, the U-shaped groove (6) formed in the second projecting piece (62) is pressed.
3) is to be engaged with the thin shaft portion (22) of the catcher pin (2). Here, the second projecting piece of the leading guide block (4)
The U-shaped groove (63) of (62) has a bottom wall (64) as shown in FIG.
It has left and right side walls (65) and (65) that are parallel to each other, and the thin shaft portion (22) of the catcher pin (2) fits in,
The lower end surface (23) of the thin shaft portion (22) slides on the bottom wall (64) of the U-shaped groove (63), and the thin shaft portions contact both side walls (65) and (65) of the U-shaped groove (63). The outer peripheral surface of (22) comes into sliding contact.

In this way, the V-shaped groove (61) of the leading guide block (4) is pressed against the thick shaft portion (21) of the catcher pin (2), so that the leading guide block (4) moves forward. The position of the direction is defined, and the leading guide block (4)
The narrow shaft portion (22) of the catcher pin (2) is fitted into the U-shaped groove (63), so that the leading guide block (4) tilts left and right and along the forward direction of the leading guide block (4). The forward / backward inclination is regulated, and the leading guide block (4) at the tape loading completion position is accurately held in a predetermined posture.

In particular, as shown in FIG.
(2) has a simple shape in which the thick shaft portion (21) and the thin shaft portion (22) are directly connected, and a flange or the like is provided between the thick shaft portion (21) and the thin shaft portion (22). Is not formed, so that in the manufacturing process, the axis of the thick shaft (21) and the axis of the thin shaft (22) can be matched with high accuracy. Also, the narrow shaft of the catcher pin (2)
Since (22) is burring-pressed from the front surface to the back surface of the chassis (1), the end of the step between the thick shaft portion (21) and the thin shaft portion (22) is the reference surface of the chassis (1). ), The catcher pin (2) is positioned in the height direction with respect to the chassis (1). Accordingly, the distance H between the surface of the chassis (1) and the lower end surface (23) of the catcher pin (2) is determined.
Is determined with high accuracy without being affected by the tolerance of the thickness of the chassis (1). Thus, the position and orientation of the leading guide block (4) are defined with high accuracy. As a result, the vertical post (4
The magnetic tape T pulled out in 1) is wound around the rotary head cylinder along an accurate traveling path.

For example, when disassembling the tape loading device (12) to replace the leading guide block (4),
First, the tension lever (13) and the brake lever (14) shown in FIG. 1 are removed from the chassis (1). by this,
Each leading guide block (4) is allowed to move backward from the tape loading start position shown in FIG. 4 to the leading guide block assembly position shown in FIG. Therefore, the driving mechanism (5)
The driven lever (52) is swung as indicated by an arrow while the drive lever (51) is kept still. Accordingly, the leading guide block (4) moves from the tape loading start position to the leading guide block assembling position.

When the leading guide block (4) reaches the installation position as shown in FIG. 5, the protruding piece (45) of the leading guide block (4) is engaged with the auxiliary groove (32) of the leading guide block guide groove (3).
And the tongue piece (53) of the driven lever (52) comes off the locking piece (47) of the leading guide block (4). As a result, the leading guide block (4) is connected to the leading guide block guide groove (3) of the chassis (1).
Can be removed vertically upward.

When assembling the tape loading device (12), the leading guide block (4) is assembled into the leading guide block guide groove (3) at the position shown in FIG. 5, and the boss (43) of the leading guide block (4) is formed. ) The leading end of the driven lever (52) is connected. Then, by swinging the driven lever (52) of the drive mechanism (5), the leading guide block (4) is moved along the leading guide block guide groove (3) to the tape loading start position shown in FIG. In this process, the projecting pieces (45) and (46) of the leading guide block (4) engage with the rear surface of the chassis (1) to prevent the leading guide block (4) from falling off and to operate the driven lever ( The tongue piece (53) of (52) engages with the locking piece (47) of the leading guide block (4) to prevent the driven lever (52) from falling off. Thereafter, the tension lever (13) and the brake lever (14) are mounted on the chassis (1).

As described above, the tape loading device (12)
When disassembling and assembling, the driving mechanism (5) is driven by the driven lever (52).
Only the rotation needs to be performed, and the reduction mechanism from the motor to the driving lever (51) does not need to be operated, so that the operation is simple. Also, the auxiliary groove of the leading guide block guide groove (3)
Since the driven lever (52) of the drive mechanism (5) extends along an arc locus when the drive mechanism (5) swings independently, the drive mechanism (5)
The auxiliary groove (32) can be formed shorter than in the case where the entire guide is moved to retract the leading guide block (4) to the installation position. Therefore, a decrease in the strength of the chassis due to the extension of the length of the guide groove (3) can be minimized. Drive mechanism
(5) In a structure in which the entire guide is operated to retract the leading guide block (4) to the installation position, a pair of driving levers is used.
(51) Since the mutual interference of (51) must be avoided, there is a problem in that the design restrictions are increased and the device is enlarged, but only the driven levers (52) and (52) are swung as in the present invention. This problem can be avoided by employing a structure.

Further, in a state where the tape loading device (12) is assembled, the guide guide blocks (4) and (4) are tension members as members for preventing the guide guide blocks (4) from retreating from the tape loading start position to the guide guide block installation position. Since the lever (13) and the brake lever (14) are used, the number of parts does not increase with the implementation of the present invention.

[Brief description of the drawings]

FIG. 1 is a plan view showing a tape loading device at the start of tape loading with a chassis omitted.

FIG. 2 is a plan view of the tape loading device when tape loading is completed, omitting a chassis.

FIG. 3 is a plan view of the chassis.

FIG. 4 is an enlarged plan view showing a leading guide block at a tape loading start position.

FIG. 5 is an enlarged plan view showing a leading guide block at a leading guide block installation position.

FIG. 6 is a diagram illustrating an eccentric relationship between a boss of a leading guide block and a rear shaft portion.

FIG. 7 is a sectional view of a driving mechanism and a leading guide block.

FIG. 8 is a perspective view of a second projecting piece formed on the leading guide block.

FIG. 9 is a plan view showing a state in which a leading guide block is in contact with a catcher pin.

FIG. 10 is a perspective view of a conventional tape loading device.

[Explanation of symbols]

 (1) Chassis (11) Rotating head cylinder (2) Catcher pin (21) Thick shaft (22) Thin shaft (3) Leading guide block guide groove (31) Loading groove (32) Auxiliary groove (33) Notch (4) Leading guide block (40) Front shaft (43) Boss (48) Rear shaft (5) Drive mechanism (51) Drive lever (52) Follower lever (6) First protrusion (61) V-shape Groove (62) Second protrusion (63) U-shaped groove

Claims (4)

(57) [Claims] 1. A rotating head installed on a chassis (1)
Tape for winding magnetic tape around cylinder (11)
In loading equipment, rotating head cylinder (11)
Guide block opened on the chassis (1) surrounding the
Slides in the guide groove (3) and the leading guide block guide groove (3).
The magnetic tape can be engaged with the rotating head cylinder (1
1) From the tape loading start position
Leading guide block that moves to the loading completion position
Block (4) and the leading guide block (4).
Drive mechanism (5) that reciprocates along the lock guide groove (3)
The drive mechanism (5) is provided with a driving lever (51) at the tip thereof.
Connect the base end of the driven lever (52) and
-(52) is not connected to the leading guide block (4).
Link mechanism,On the chassis (1), the guide groove (3)
The guide block (4) is taped down to a position
Catcher to catch at the loading completion position
(2) is erected,  The guide groove (3) guides the guide block (4) by driving the drive mechanism (5).
Tape loading start position and tape loading completed
Loading groove for reciprocating between positions (31)
When,Start the tape loading of the leading guide block (4).
From the position of the driving mechanism (5) moved to Drive lever (51)
With the follower lever (52)When you swing
It extends along the arc drawn by the bar tip,Tape loading
The leading guide block (4) at the starting position
With the auxiliary groove (32) for retracting to the
At the position where the leading guide block is assembled
Install lock (4) in leading guide block guide groove (3)
A tape loading device that is capable of. 2. An auxiliary groove portion (32) of the leading guide block guide groove (3) is provided with a notch for allowing the leading guide block (4) at a position where the leading guide block is assembled to pass vertically to the chassis (1). 2. The tape loading device according to claim 1, wherein a notch (33) is formed. The leading guide block (4) has a shaft (48) slidably fitted in the leading guide block guide groove (3), and the shaft (48) is provided with a drive mechanism (5). The tape loading device according to claim 1 or 2, wherein the tape loading device is eccentric to a front side of the leading guide block guide groove (3) from a connection point P1 with the driven lever (52). 4. A member for performing a predetermined function other than tape loading is detachably assembled on the chassis (1) near the auxiliary groove (32) of the leading guide block guide groove (3). The tape loading device according to any one of claims 1 to 3, wherein the member prevents the leading guide block (4) from retreating from the tape loading start position to the leading guide block assembling position.