JPH06168526A - Cassette loading drive device in magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To use an inexpensive switch and to reduce manufacturing cost by making such operations that a switch plate is pressed by a cam surface of a driving gear to be slid at the time of loading a cassette, and is slid by a hold cam at the time of completing the loading. CONSTITUTION:When a large diameter circular-arcuate part of the cam surface 53 becomes opposite to a protrusion 63 in progressing reverse rotation of the driving gear 5, the switch plate 6 is pressed back against a spring 61 to turn off a detecting switch 64, so that an electric supply to a motor 17 is cut off. Since a regulating piece 36 and a tray 2 are released from their clamping, a cassette 9 can freely be taken out. A tray supporting body 3 is further advanced, and when a 1st restraining surface 84 of a stopper is engaged with a notch 37, the unloading is completed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drive device for a cassette loading device of a tray device on which a magnetic tape cassette is placed in a magnetic recording / reproducing device using a magnetic tape as a recording medium such as a VTR.

[0002]

2. Description of the Related Art Cassette loading devices are, for example,
As described in JP-A-2-83747, drive pins are provided to project laterally from a tray device on which a cassette is placed, and a drive gear having a drive arm is provided on the side wall of the main body. By loading the drive pin on the drive arm and rotating the drive gear forward and backward, loading and unloading of the tray device is performed along the L-shaped guide hole formed in the side wall of the main body. Completion of loading and loading of the cassette in the tray device is performed by disposing a micro switch facing the cam surface formed exclusively on the side surface of the drive gear and detecting the rotation of the drive gear.

[0003]

When the loading is completed,
Since the drive gear arrives at the loading position and detects a slight difference in the rotation angle at the completion of clamping, the stroke for pressing the switch contact piece of the micro switch is shortened, and as a switch that operates with this short stroke,
I needed something expensive.

Further, when the holding of the tray device by the drive arm of the drive gear is released at the time of completion of loading, the drive gear is pushed up in the opposite direction by the reaction from the tray device, so that the reverse rotation of the drive gear is prevented. However, it is necessary to separately provide a lock device for the drive gear, which causes a problem of increased manufacturing cost.

[0005]

The present invention provides a gear train (42
a relay gear (4) connected to the motor gear (41) via a to d) and having a tooth surface and a toothless surface (43) on the peripheral surface and a hold cam (45) having a pressing surface on the side surface. And a drive arm (52) that meshes with the relay gear (4) and holds the drive pin (33) extending from the tray device to reciprocally move the tray device, projecting radially, and a cam surface (53) on the side surface. ) Equipped with a drive gear (5),
A detection switch (64) for detecting cassette loading and loading completion in the tray device and a switch (64) arranged on the main body (1) so as to be close to and away from the drive switch (64) and slidable along the relay gear (4). A switch plate (6) provided with a follower (62) facing the hold cam (45) of the relay gear (4) was provided in the loading drive device.

[0006]

[Operation] During standby, the switch plate (6) is the detection switch (64)
When the cassette is loaded, the drive gear (5) is rotated by pushing the cassette into the tray device, and the detection switch (64) is activated to rotate the motor gear (41). Loading is advanced by the drive rotation of the motor gear (41), and at the final stage of loading the relay gear
Make sure that the toothless surface (43) of (4) faces the drive gear (5).
Power transmission to (5) stops and drive gear rotation stops. However, the follower (62) of the switch plate (6) is pushed by the hold cam (45) of the relay gear (4) and slides, and the detection switch (64)
Away from the motor gear (4
1) Stop.

In unloading, the motor gear (41) rotates in the reverse direction, and the follower (62) of the switch plate (6) is released from the hold cam (45). The switch plate (6) slides on the detection switch (64) by the spring biasing force, and the detection switch
Activate (64). When the tray device reaches the cassette insertion position, the cam surface (53) of the drive gear (5) pushes back the switch plate (6), releases the detection switch (64), stops the rotation of the motor gear (41), and waits. Return to the state.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT The drawings and the following description refer to 8 mm magnetic tape
Although an example in which the present invention is implemented is shown in R, the present invention can be used in other magnetic recording / reproducing devices. The tray device is
Needless to say, the present invention can be applied to a single tray type that moves to the loading position immediately after the cassette is loaded.
The magnetic tape cassette (9) is designed to be relatively movable with respect to the tray support (3) so that it can be easily ejected by ejecting the cassette from the opening of the main body during unloading. The tray (2) is loaded on the cassette mounting surface, and the tray (2) and the tray support (3) are movably supported by both side walls (11) and (11) of the main body (1). Was carried out (see Japanese Patent Laid-Open No. 2-83747).

The main body (1) is provided with a pair of reel stands (13) and a magnetic head drum (14) corresponding to the cassette loading position on the bottom wall (12), and is mounted on one side wall (11) of the main body. Has
It is equipped with a DC motor (17) and the motor gear (4
1) is connected to a known tray drive mechanism via a gear train (42a to 42d) and a relay gear (4).

The drive mechanism is a drive arm having a guide hole.
A drive gear (5) having (52) and a tooth surface (51) of the drive gear (5)
It consists of a transmission gear (58) that meshes with the side wall.
The drive pin (33) of the tray support (3) protruding from the L-shaped guide hole (15) opened in (11) is fitted into the guide hole of the drive arm (52), and the drive gear (5) The drive pin (33) is moved along the guide hole (15) by forward and reverse rotation, and the tray (2) and the tray support (3) are moved back and forth between the opening (not shown) of the main body and the loading position. It is to be transported back and forth.

In the following description, the opening side is referred to as "forward".
The loading direction is "backward". A drive gear having an L-shaped guide hole (15) and a drive arm is symmetrically provided on the other side wall (11) of the main body (1), and the transmission shaft (59) of the transmission gear (58) is provided on the main body. For driving two drive mechanisms on both side walls at the same time.

The tray (2) is located on both side walls of the tray mounting surface (28).
A tray pin (25) and a guide pin (26) are projectingly provided on (24). The tray (2) is fitted between both side walls (31) (31) of the tray support (3), and the tray is inserted into the guide holes (35) (35) formed in the side wall.
Tray pin (25) and guide pin (2
6) is fitted and the tray (2) is relatively moved within the guide hole (35) in the tray support (3). The placing surface (28) of the tray (2) is provided with a cutout hole (21) into which the reel stand (13) fits when transported to the loading position, and a cassette contact (22) is provided at the tip in the loading direction. It is protruding.

The tray support (3) has a gate structure in which both side walls (31) and (31) are connected by a metal tray upper (32), and supports the tray (2) so that it can reciprocally move. Drive pin (33) and guide pin protruding from the side wall (31)
(34) (34a) is fitted into the L-shaped guide hole (15) formed in the side wall (11) of the main body (1) and the L-shaped guide groove (16) recessed in the inner surface of the side wall, Connect the drive pin (33) to the drive arm of the transport mechanism.
It fits in the guide hole formed in (52) and reciprocates. A cover opener (7) is provided between the side walls of the tray support (3) to release the tape-protecting front lid of the cassette.

As shown in FIGS. 1 and 2, the cover opener (7) has an outward guide pin (74) projecting from the side of the arm rod (75) at both ends of the opener frame (71) so as to support the tray supporter. It fits into the arc-shaped opener guide hole (39) formed in the side wall of (3). One guide pin (74) penetrates the guide hole (39) of the side plate (31) and projects laterally, and is moved along a guide (78) projectingly formed on the side wall (11) of the main body. The guide (78) is horizontal at the front and slightly elevated at the rear, so that the arm rod can be used when the cassette is transported.
Rotate (75) upward. Behind the guide (78), a bracket (77) forms a mounting surface which is separated from the side wall (11) and has an auxiliary opener (76) having an arc-shaped guide surface at its upper end. When the tray support (3) descends to the loading position, the guide (78) guides the guide pin (74) of the cover opener (7), hangs the opener frame (71) on the auxiliary opener (76), The opener frame (71) is fully opened.

Although the above is a known structure, in the present invention, the detection switch (64) is arranged inside the side wall of the main body, and the switch plate is provided.
(6) is slidably arranged between the outside of the side wall and the relay gear (4) and the drive gear (5), and the protruding shaft (6
3) was penetrated through a guide hole (not shown) formed in the side wall of the main body to project inward and face the detection switch (64). Inside the drive gear (5), a cam surface (53) consisting of a small-diameter circular arc portion and a large-diameter circular arc portion is formed, and the protruding shaft (6) of the switch plate (6) is formed.
3) is applied. The switch plate (6) is biased toward the drive gear (5) by the spring (61), and as the drive gear (5) rotates, the cam surface (53) pushes the protruding shaft (63), The detection switch (64) is turned on and off.

In the relay gear (4), the tooth surface of the peripheral surface is the gear train (42d).
It rotates by meshing with, but has a toothless surface (43) on a part of the peripheral surface.
In the section of the toothless surface (43), the relay gear (4) idles and stops the drive gear (5).

Inside the relay gear (4), there is a guide cam (4) having a guide portion extending in the radial direction and an arc portion extending in the circumferential direction.
4) and a hold cam (45) having a pressing surface that is slightly inclined with respect to the radial direction is provided so that it protrudes at the tip of the drive arm (52).
(54), facing the guide cam (45), switch plate
(6) A follower (62) is provided at the rear end of the rear end so as to project toward the hold cam (45).

The tray support (3) has a coil spring (96) on the side surface.
Is installed and cooperates with the tray (2) and the cover opener (7). The spring (96) is, as shown in FIGS. 3 and 4,
One end (97) is hooked on the drive pin (33), and the other end extension (98) is hooked on the guide hole (35) to extend across the opener guide hole (39). The extension (98) of the spring (96) has a tray pin (25).
And above the guide pin (74) of the cover opener (7). The guide hole (35) of the side wall (31) of the tray support is bent at the upper side of the hole toward the loading progress side (35b),
The upper side (35a) on the loading side is low. Further, the extension portion (98) of the spring (96) is bent upward (99) by one step facing the side end of the opening of the guide hole (35).

On the inner surface of both side walls (31) of the tray support (3),
The tray rising restricting pieces (36) are respectively projected at positions slightly higher than the upper side of the front part of the guide holes (35). Both sides of the body (11)
Inside, the stoppers (8) are placed on the opening side,
When the cassette is on standby, the tray (2) and the tray support (3) are locked at the positions of the openings, respectively. Tray support
A downward cut (37) is made on the side wall (31) of (3), a contact surface (37a) is formed on the opening side of the cut, and a cam surface (38) which inclines downward on the lower side of the side wall toward the opening direction. Is formed. The tray (2) is formed by bending downwardly facing pieces (23) on both sides of the front side of the cassette mounting surface (28) and making a cut (27) adjacent to the corresponding piece (23). The stopper (8)
Of the lock lever (82) pivotally supports the base end of the lock lever (82) on the inner surface of the main body side wall (11) by the pivot shaft (81). The first locking surface (84) is formed facing the (37a), and the lock lever (82) is formed.
A second locking surface (85) facing the hitting piece (23) projecting on the front part of the tray and a detecting piece (83) facing the notch (27) are projectingly provided at the tip of each of them. A projecting piece (19) is provided on the side wall (11) of the main body so as to face the hitting piece (23) at the standby position of the tray (2), and locks the forward movement of the tray (2).

Next, the operation of the driving device of the loading device having the above structure will be described in comparison with the operations of the tray (2), tray support (3) and cover opener (7). (Standby) As shown in FIG. 4a, the tooth surface of the relay gear (4) meshes with the drive gear (5). On the cam surface (53) of the drive gear (5), the large-diameter circular arc portion faces the protruding shaft (63) of the switch plate (6), pushes back the switch plate (6), and turns off the detection switch (64). ing.

The tray (2) and the tray support (3) are shown in FIG.
When the cassette is stopped in the vicinity of the insertion port as shown in Fig. 4 and waiting for cassette insertion, the contact piece (23) protruding from the front edge of the tray (2) hits the protruding piece (19) on the side wall of the main body and moves forward. Is regulated. The tray support (3) is restricted from moving forward because the rear end of the guide hole (35) hits the tray pin (25). The stopper (8) is urged to rotate in a clockwise direction by a spring (not shown) provided between the stopper (8) and the side wall of the main body, and stops at the position where the tip of the lock lever (82) hits the protrusion (19). The first locking surface (84) engages with the contact surface (37a) of the cassette support body (3) to restrict the rearward movement of the cassette support body (3). Further, the second locking surface (85) engages with the contact piece (23) of the tray to restrict the rearward movement of the tray. The detection piece (83) at the tip of the lock lever projects above the cassette mounting surface (28) through the notch (27) in the tray.

The tray pin (25) is attached to the rear end portion (3) of the guide hole (35).
5a), and the tray pin (25) pushes down the spring extension (98) because the upper side of the guide hole is lowered by one step at this position. Accordingly, the tip of the spring extension portion (98) biases the guide pin (74) of the cover opener downward, so that the opener frame (71) is maintained in the closed state. Even when the VTR is vibrated or tilted, the tray (2) and the tray support are regulated by the stoppers (8) and the standby position is held. Further, since the opener frame (71) is pressed and biased by the spring (98), it cannot be rotated freely and is always pressed to the closed position. Also, the tray pin (25) is pushed down by the stepped-down portion (35a) of the guide hole,
Since (2) is away from the restricting piece (36) projecting from the side plate of the tray support (3), when the cassette is inserted into the mounting surface,
As shown in FIG. 5, a clearance A is formed between the cassette and the restriction piece (36) so that the cassette can be freely taken in and out.

(When inserting cassette) When the cassette (9) is inserted into the tray (2), the cassette (9) has two detection pieces (83) protruding from both sides of the mounting surface (28). Push it down to the position of the opener frame (71). At this time, stopper (8)
Is rotated slightly downward by pushing down the detection piece (83),
The first locking surface (84) disengages from the contact surface (37a) of the tray support member to allow the tray support member (3) to move freely. However, the second locking surface (85) is the contact piece (23) protruding from the tray.
The tray (2) is restricted from moving because it is still engaged with. Therefore, when the tray support (3) moves in the loading direction, the tray (2) moves forward relative to the tray support (3). Since the stoppers (8) are arranged on both sides of the tray mounting surface, the insertion of the cassette is detected by the two detection pieces (83). If the cassette is inserted diagonally or sideways, only one detection piece hits the cassette, and the other detection piece projects above the cassette mounting surface, so the first locking surface and tray support Engagement with the body continues, preventing forcible insertion of the cassette.

(Loading of cassette) The cassette (9) is shown in FIG.
After hitting the opener frame (71) of the cover opener (7) as shown in (4), the tray support (3) moves rearward as shown in FIG. The cam surface (38) formed on the lower side of the tray support side plate guides and pushes down the lock lever (8), and the second locking surface (85)
Disengages the contact piece (23) and makes the tray (2) movable.

In FIG. 5, the tray (2) has a second locking surface (85).
When the cassette (9) pushes the opener frame (71) to move only the tray support (3) in the loading direction while the movement is restricted by the tray (2), the tray (2) is
Since it moves forward relative to (3), the tray pin (2
5) moves away from the stepped lower part (35a) of the guide hole (35) and moves to the position of FIG. 6 where the upper side of the guide hole (35) is raised further. When the tray support (3) moves rearward and the opener frame (71) engages with the cassette abutment (23) provided at the tray end, the tray support (3) loads with the tray (2). It is transported to the position.

When the tray pin (25) is moved to the front end of the guide hole (35), the bent portion (99) of the spring extension portion (98) is moved to the tray pin (2).
5) Lightly lock, then tray (2) and tray support
(3) becomes one set. In addition, the tray pin (25) is
Since it moves to a higher position via the bent part (35b) of 5), the tray pin (25) is pushed up by the extension part (98) of the spring,
The cassette (9) is pressed against the regulation piece (36) protruding from the side wall of the main body to clamp it.

By pushing the cassette (9), the tray
When (2) and the tray support are moved, as shown in FIG. 6a,
The drive gear (5) is rotated in the direction of the arrow by pressing the drive arm (52) with the drive pin (33), and the cam surface (53) has a small-diameter circular arc portion facing the protruding shaft (63) of the switch plate (6). Like Since the switch plate (6) moves forward and turns on the detection switch (64), the cassette loading is detected, the motor (17) is energized, and thereafter the rotation of the motor gear (41) is transmitted to the drive gear (5). To be done.

(Conveyance of cassette) As shown in FIG.
When the tray (2) and the tray support (3) are conveyed as a set by engaging the spring bent portion (99) with the spring (25), the guide pin (74) of the cover opener guides the inner surface of the side wall. Guided upward by (78), the opener frame (71) rotates counterclockwise upward. At this time, the projecting piece (72) projecting from the end of the opener frame (71) locks the cover of the cassette, and simultaneously with the rotation of the cover opener, the cassette lid is opened and rotated. As the transfer to the tray support (3) progresses, the opener frame (71)
Since the opening rotation of the guide pin expands, the guide pin (74)
After passing through (8), the opener frame (71) is the auxiliary opener (7
Backed by 6).

The drive gear (5) is a relay gear (4) depending on the gear ratio.
On the other hand, since the rotation is increased, the protrusion (54) at the tip of the drive arm (52) rapidly approaches the guide cam (44) as shown in FIG. 7A.

(Completion of loading) As shown in FIG. 8, the drive pin (33) of the tray support (3) is connected to the guide hole (1) of the side wall (11) of the main body.
When descending the vertical part of 5), the tray (2) and tray support
(3) descends along the guide hole (15) and the cover opener
(7) and the cassette lid remain on the upper side supported by the auxiliary opener (76), so that the cassette lid of the cassette (9) can be opened widely.

When the cassette arrives at the loading position, as shown in FIG. 8a, the toothless surface (4) of the relay gear (4) is
3) starts idling in opposition to the drive gear (5), and gear transmission to the drive gear (5) stops. However, the projection (54) at the tip of the drive arm (52) enters the introduction part of the guide cam (44), and the drive gear (5) is slowly rotated by the guide cam (44).

Upon completion of loading, the protrusion (54) moves below the circumferential arc of the guide cam (44), is pressed down, and is held in a clamped state. The relay gear (4) continues to rotate, and the hold cam (45) moves the follower (6) of the switch plate (6).
Press 2) to force the switch plate (6) to move backwards against the spring (61). Therefore, the protrusion (63)
Since the switch (64) is turned off apart from 4), the completion of loading is detected, the energization of the motor (17) is stopped, and the cassette loading is completed.

(Unloading) For unloading, the above steps are followed in reverse, and when the motor gear (41) rotates in the reverse direction,
The relay gear (4) reversely rotates to release the protrusion (54) of the drive gear (5) from the guide cam (44). The switch plate (6) is biased by the spring (61) and advances toward the drive gear (5) as the hold cam (45) rotates in the separating direction. However, since the toothless surface (43) of the relay gear (4) faces the drive gear (5), the drive gear (5) does not rotate.

When the rotation of the relay gear (4) has reached the position where the tooth surface of the relay gear (4) meshes with the drive gear (5) (FIG. 8a), the drive gear (5)
Is driven by a relay gear (4), and the tray (2) and the tray support (3) form a set, and guide holes (1
Transported along 5). First, the cover opener (7) is disengaged from the auxiliary opener, the guide pin (74) descends downward to the guide (78), the opener frame (71) is returned to the closed position, and the engagement with the cassette lid is released.

As the tray support moves forward, the contact piece (23) of the tray (2) hits the projecting piece (19) and its forward movement is restricted, and the stopper (8) moves to the cam surface (38). The second locking surface (85) engages with the abutting piece (23) to keep the tray (2) from moving forward and backward while rotating clockwise upward.

As the tray support (3) continues to advance independently, the bent portion (99) of the spring passes through the tray pin (25) to engage the tray (2) with the tray support (3). Remove. As the tray support body (3) continues to move forward relative to the tray (2), the tray pin (25) is pulled down by the one-step lowering portion (35a) of the guide hole (35), and the tray (2 ) Is lowered.

Reverse rotation of the drive gear (5) progresses, and the cam surface (53)
When the large-diameter circular arc portion of the switch faces the protrusion (63) (Fig. 4a), the switch plate (6) is pushed back against the spring (61), the detection switch (64) is turned off, and the motor (17) Cut off the power supply to.
Since the clamp of the regulation piece (36) and the tray (9) is released,
The cassette (9) can be taken out freely. The tray support (3) further advances, and the first locking surface (84) of the stopper engages with the notch (37) to complete the unloading.

[0038]

The switch plate (6) is pushed by the cam surface of the drive gear (5) to slide when the cassette is loaded, and slides by the hold cam (45) when the loading is completed.
The two cam surfaces work interchangeably on the switch plate (6). Therefore, the drive gear (5) can largely slide the switch plate (6) even at the time of completion of loading, which hardly rotates. Since the detection stroke is expanded, the detection switch (64) can be reliably operated without malfunction, and the manufacturing cost can be reduced by using an inexpensive switch.

Since the above description and drawings are for the purpose of facilitating the understanding of the present invention, they should not be used to narrowly interpret the scope of the claims. It goes without saying that the present invention can be easily modified by those skilled in the art within the scope of the claims without departing from the technical idea.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of the device of the present invention.

FIG. 2 is a plan view of the device of the present invention.

FIG. 3 is an exploded perspective view of a main part.

FIG. 4 is an explanatory diagram showing a tray device and a drive device in each loading process.

FIG. 5 is an explanatory diagram showing a tray device and a drive device in each loading process.

FIG. 6 is an explanatory diagram showing a tray device and a drive device in each loading process.

FIG. 7 is an explanatory diagram showing a tray device and a drive device in each loading process.

FIG. 8 is an explanatory diagram showing a tray device and a drive device in each loading process.

FIG. 9 is an explanatory diagram showing a tray device and a drive device in each loading process.

[Explanation of symbols]

 (1) Main body (2) Tray (25) Tray pin (28) Cassette mounting surface (3) Tray support (33) Drive pin (36) Control piece (38) Cam surface (4) Relay gear (41) Motor gear ( 43) Toothless surface (44) Guide cam (45) Hold cam (5) Drive gear (9) Cassette

Claims (2)

[Claims] A motor gear (41) in a loading drive device for transporting a tray device having a cassette mounting surface from an opening of a main body to a loading position of the main body where a reel stand and a magnetic head are disposed. ) Is connected to the motor gear (41) through a gear train (42a to d),
A relay gear (4) having a toothed surface and a toothless surface (43) on its peripheral surface and a hold cam (45) having a pressing surface on its side surface meshes with the relay gear (4) and extends from the tray device. Drive pin (3
Drive arm that holds 3) and moves the tray device back and forth
A drive gear (5) having a cam surface (53) on its side, and a detection switch (64) for detecting cassette loading and loading completion in the tray device; and the drive switch. (64) can be moved closer to and away from the relay gear
The relay gear is slidably mounted on the body (1) along (4).
A loading drive device in a magnetic recording / reproducing device, which comprises a switch plate (6) having a follower (62) facing the hold cam (45) of (4). 2. A guide cam (4) having a guide portion in the radial direction and an arc portion in the circumferential direction on the side surface of the relay gear (4).
4) is installed, and the guide cam (44) is attached to the tip of the drive arm (52).
The device of claim 1 provided with a protrusion (54) opposite said.