JPS6316033Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a holder locking mechanism for a magnetic recording/reproducing device using a cassette holder, and includes a discriminating means such as a micro switch to distinguish whether or not the holder is completely locked. The purpose is to make the system work without malfunction.

Conventionally, when a discriminating means such as a micro switch is used in conjunction with the locking mechanism of the cassette holder,
When the locking part is in the halfway state, the determining means may also stop in the halfway state, causing malfunction. The present invention solves the above-mentioned drawbacks of the conventional technology, and allows the user to select ON or OFF of the discriminating means without any intermediate state.

Embodiments of the present invention will be described below with reference to the drawings.

1 is a chassis to which a micro switch 2 and a sub chassis 3 are fixed. The micro switch 2 is used as a means for determining whether or not the cassette holder 4, which is movable in the direction of arrow A-B in FIG. When the switch is ON, various operations of the magnetic recording/reproducing device are enabled, and when the switch is OFF, operations are disabled. Reference numeral 5 denotes an ejection rod which is slidably attached to the shafts 6 and 7 fixed to the sub-chassis 3, and is pressed in the direction of pressing the micro switch 2 by a spring 8 applied between it and the chassis 1 (arrow C in FIG. 1). direction)
is energized by Reference numeral 9 denotes a control lever, the central part of which is a U-shaped lever, with a contact part 9a with a roller 10 for locking the cassette holder, and a bent part 9.
b at the tip and an interlocking pin 11 at the other end, and is rotatably attached to a stepped shaft 12 fixed to the cut and raised portion of the sub-chassis 3. The interlocking pin 11 is connected to the bent portion 5 of the ejection rod 5.
Since it is inserted into the long hole 5a provided in b,
The control lever 9 interlocks with the sliding movement of the ejector rod 5, is biased counterclockwise by the spring 8, and comes to rest at the return position of the ejector rod 5 (the state shown in FIG. 1). Reference numeral 13 denotes a locking lever, and the locking portion 13 has an R-shape with a bent portion 13a that comes into contact with the bent portion 9b of the control lever 9.
b, is rotatably attached to the stepped shaft 12 on the U-shaped inside of the control lever 9 at the boss portion 13c, and has a spring 1 hung between it and the chassis 1.
4 in the counterclockwise direction, the bent portion 13a
comes into contact with the bent portion 9b and is stationary (the state shown in FIGS. 1 and 4). Reference numeral 15 denotes a blocking rod that is slidably attached to a shaft 16 fixed to the cut and raised portion of the sub-chassis 3 and the stepped shaft 12, and has a control protrusion 15a at its tip and a roller 10 at a position facing the roller 10. Detection unit 15b in contact with 10
The roller 10 is biased in the direction of lifting by a compression spring 18 applied between the roller 10 and the fixing member 17. The roller 10 is rotatably attached to a roller shaft 19 fixed to the cassette holder 4, and when the roller shaft 19 is held, the cassette holder 4 is fixed. Note that 20 is a cassette and is housed and fixed in the cassette holder 4. The operation will be explained below. FIG. 3 shows the cassette holder 4 in an ejected state. At this time, the ejector rod 5 is being moved against the spring 8, and the micro switch 2 is turned OFF, making each operation impossible. Further, since the control lever 9 is interlocked with the ejection rod 5 by the interlocking pin 11, the control lever 9 is rotated clockwise. Since the bent portion 9b of the control lever 9 and the bent portion 13b of the locking lever 13 are in contact with each other, the locking lever 13
is rotated clockwise together with the control lever 9, and the blocking rod 15 is moved upward by the biasing force of the spring 18, so that the control protrusion 15a of the blocking rod 15 is brought into contact with the bent portion 9b of the control lever 9. Since they come into contact with each other, the control lever 9 and the locking lever 13 are prevented from returning counterclockwise, and the microswitch 2 is also prevented from being pressed, so that the OFF state is maintained. Next, when the cassette holder 4 is pushed in against the biasing force (not shown), the roller 10
comes into contact with the detecting portion 15b of the blocking rod 15, as shown in FIG. 6, so that it is pushed down against the spring 18, and finally the prevention of rotation of the bent portion 9b of the control lever 9 by the control protrusion 15a is released. Therefore, the control lever 9 and the locking lever 13 both rotate counterclockwise to hold the roller 10 as shown in FIG. At this time, the roller 10 is held only by the R-shaped locking portion 13b of the locking lever 13. Since the R shape of the control lever 9 is set to have a larger radius than that of the locking lever 13, it is out of contact with the roller 10. As the control lever 9 rotates, the ejector rod 5 also returns to its original position, so the micro switch 2 is pressed and turned ON. Therefore, it is determined that the cassette holder 4 is completely installed, and various operations are possible. From this state, reset the eject rod 5 to the first position.
FIG. 4 shows a state in which it is slightly pressed in the direction opposite to arrow C. By moving the ejector rod 5, the micro switch 2 is turned OFF, making each operation impossible. Further, the control lever 9 and the locking lever 13 are both rotated clockwise in conjunction with the ejector rod 5, but the roller 10 is maintained. At this time, the roller 10 is biased in the opening direction, and the locking lever 1
This is held by the locking part 13b having an R shape of 3, but due to the frictional force between the locking part 13b and the urging force of the roller 10, despite the return force of the spring 14. There are times when it is not possible to return to the lock position shown in Figure 1. However, since the control lever 9 is not in contact with the roller 10, it is not subjected to the frictional force caused by the roller 10, so the return force of the ejection rod 5 returns it to the lock position shown in FIG. 1, and the state shown in FIG. Been
It turns ON and each operation becomes possible. Next, explaining the eject operation, when the eject rod 5 is pressed from the state shown in FIGS. 1 and 5, the control lever 9 and the locking lever 13 both rotate clockwise, and the roller 10 is controlled as shown in FIG. 6. After contacting the contact portion 9a of the lever 9, it further moves in the opening direction. When the control lever 9 rotates until the roller 10 comes into contact with this contact portion 9a, the blocking rod 15 is moved upward by the biasing force of the spring 18, and the control protrusion 15a comes into contact with the bent portion 9b of the control lever 9. 3, and prevents the control lever 9 from returning counterclockwise, resulting in the state shown in FIG. As described above, according to the present invention, when the cassette holder 4 with the locking roller 10 is in the raised position, the control lever 9 and the locking lever 13 are both held rotated clockwise, and the microswitch is activated. 2 is also kept in the OFF state, making each operation impossible. When the roller 10 is pushed in and locked by the locking lever 13, the micro switch 2 is turned on and each operation becomes possible. At this time, even if the locking lever 13 stops halfway due to a half-hearted eject operation, as long as the roller 10 is not released,
Move to the specified lock position and press micro switch 2.
is pressed and turned ON, allowing each operation. Furthermore, when the cassette holder 4 is raised by the eject operation, the control lever 9 and the locking lever 13 are always kept rotated clockwise as described above, and the micro switch 2 is also turned OFF.
The state will be as follows. As mentioned above, if the cassette holder is in the raised position, the micro switch will turn OFF.
If it is in the lowered position, the microswitch is turned on and determines whether each operation is possible or not without malfunction.
In this way, according to the present invention, it is possible to control whether or not each operation of the magnetic recording/reproducing device is possible, regardless of the locked state of the cassette holder, simply by determining whether or not the cassette holder is in the raised position. Therefore, there is no malfunction, the configuration is simple, and the effect is great.

[Brief description of the drawings]

The drawings show one embodiment of the present invention; Fig. 1 is a front view of the main part with the cassette holder locked, Fig. 2 is a side view of the same, and Fig. 3 is a view of the main part with the cassette holder open. Fig. 4 is a partial side view with the eject rod pushed in slightly from the locked state, Fig. 5 is a partial side view when the eject operation is stopped from the state shown in Fig. 4, and Fig. 6 is a partial side view. FIG. 6 is a partial side view when the cassette holder moves from the locking portion in the opening direction. DESCRIPTION OF SYMBOLS 1... Chassis, 2... Switch, 3... Sub chassis, 4... Cassette holder, 5... Eject rod, 8, 14, 18... Spring, 9... Control lever, 10... Locking roller, 12... ...Switch, 13...Lock lever, 15...Block rod.

Claims (1)

[Scope of utility model registration request] movable between a first position and a second position;
and a cassette holder 4 biased in the direction of the first position, a chaining roller 10 fixed to the cassette holder, and a control lever rotating between a third position and a fourth position. 9, the control lever 9 is biased and pressed by the control lever 9, and the control lever 9 is pressed by the spring.
When the control lever 9 provided on the chain setting lever 13 is in the third position, it engages with the chain setting roller 10 and moves the chain setting roller 10 to its position. a locking part 13b that locks in position, and moves between a fifth position and a sixth position in the moving direction of the cassette holder 4;
A blocking rod 15 having a detecting portion 15b that comes into contact with the locking roller 10 and a control protrusion 15a that engages with the locking lever 13 at its tip end, and the blocking rod 15 is attached in the direction of the fifth position. A cassette holder comprising a biasing means 18 for biasing the ejector, an ejector rod 5 connected to the control lever 9 to move the control lever 9 to the fourth position, and a switch 2 that opens and closes in accordance with the movement of the ejector rod 5. locking device.