JPH0538417Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The invention uses one trigger lever to lock only one of two coaxial notched gears when a predetermined member is in a certain position. This invention relates to a gear lock mechanism that locks only the other notched gear when a predetermined member moves to another position.

[Conventional technology]

As shown in the plan view of FIG. 10 and the side view of FIG. Possible arm 3
2a and 32b, and a sliding lock lever 32 that slides in response to the movement of a head stand 33 on a predetermined member such as a cassette deck,
When the head stand 33 is moved backward, the arm 32
Lock the notch gear 30 with a, and when the head stand 33 is moving forward, lock the notch gear 3 with the arm 32b.
A device that locks 1 is known.

[Problem that the invention attempts to solve]

However, with the conventional gear lock mechanism mentioned above,
Since the lock lever 32 is a sliding type, the load on the head stand 33 that moves it is large, and since the notch gears 30 and 31 are locked from the bottom of each, one side of each notch gear is locked. The disadvantage is that it cannot be used as a cam forming surface,
The drawback was that the structure was complicated due to the sliding lock lever.

The present invention eliminates these conventional drawbacks.The purpose of this invention is to have a simple structure, to reduce the load on the member that moves the lock lever, and to make one side of each notched gear a cam forming surface. The objective is to provide a gear lock mechanism that can.

[Means for solving problems]

In order to achieve the above object, the present invention locks one of two notched gears that are rotatable independently of each other around the same axis when a predetermined member is in the first position. and a gear lock mechanism that locks the other notched gear when the predetermined member moves to a second position; , the first and second
a driving gear that applies rotational force to the notched gear; and mutually opposing surfaces of the first and second notched gears are both dug down and formed at different locations in the dug down portion, respectively. first and second locking cam portions; and each of the second locking cam portions, which is provided so as to protrude between the first notch gear and the second notch gear, and is adapted to act as a trigger solenoid. a trigger lever that engages to lock the first and second notched gears; and a rotating trigger that rotates in response to movement of the predetermined member and is inserted between the first and second notched gears. a mold lock lever, which is provided on the rotary lock lever and engages with either one of the first locking cam portions depending on the position of the predetermined member to lock the first and second notch gears; It is equipped with a locking pin that locks only one side.

[Effect]

When the predetermined member is in the first position, the locking pin of the rotary lock lever and the locking cam portion formed on one of the notched gears engage, and only the one notched gear is locked. The member is the second
When the rotary lock lever is moved to the position, the locking pin of the rotary lock lever engages with the locking cam portion formed on the other notched gear, and only the other notched gear is locked. Therefore, when the first and second notch gears are unlocked by the trigger lever when a predetermined member is in the first position, only the other notch gear becomes free, and the driving gear When only the other notched gear is rotated and the first and second notched gears are unlocked by the trigger lever when the predetermined member is in the second position, the first and second notched gears are rotated by the trigger lever. Only the notched gear becomes free, and only the one notched gear is rotated by the driving gear.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings.

1 to 9 are explanatory diagrams of an embodiment in which the present invention is applied to a first notch gear for driving cassette pack insertion and ejection of a cassette deck and a second notch gear for channel switching, In each figure, 1 is the first notch gear, 2 is the second notch gear, 3, 6, and 9 are shafts, 4 is a gear, 5 is a lock lever, 7 is a headrest, 8 is a trigger lever, and 10 is a This is a trigger solenoid. Among the drawings, FIG. 1 shows a head stand 7 on which a magnetic head (not shown) is mounted.
Figure 2 shows the top view when the head stand 7 has moved back to the standby position (the position where the magnetic head is retracted to the farthest point so that the cassette pack can be inserted and ejected). The plan view in FIG. 3 is a simplified diagram showing the state seen from the direction of the arrow 20 in FIG. 1 to clearly show that the lock lever 5 and the trigger lever 8 are inserted between the notched gears 1 and 2. 4 is a plan view of the notched gear 1, FIG. 5 is a rear view of the notched gear 1, FIG. 6 is a sectional view taken along the dashed line 21 in FIGS. 4 and 5, and FIG. 7 is a side view of the notched gear 1. 8 is a plan view of the notched gear 2, FIG. 8 is a rear view of the notched gear 2, and FIG. 9 is a sectional view taken along the dashed line 22 in FIGS. 7 and 8.

As shown in FIGS. 7 to 9, the notched gear 2 has a first notch 2a, a second notch 2b, and other tooth surfaces around the periphery, and has a central portion of the surface. As shown in FIG. 7, a first locking cam portion 2d and a second locking cam portion 2e having substantially point-symmetric shapes are formed at the center of the through hole 2g, and the first and second locking cam portions 2d and 2e are formed in the center of the through hole 2g. The surface excluding the locking cam parts 2d and 2e and the peripheral part is dug down to form a dug down part 2c. Furthermore, a cam portion 2f for channel switching is formed on the back surface of the notched gear 2, as shown in FIG. This notched gear 2 has a cam portion 2f.
The shaft 3 of the chassis is loosely inserted into the through hole 2g and rotatably placed on the chassis so that the back surface on which is formed faces a chassis (not shown). In addition,
The notched gear 2 is placed on the chassis, and its first
Alternatively, at the rotational position where the second notches 2a and 2b face the gear 4, they are urged counterclockwise by, for example, a channel switching lever that engages with the cam portion 2f.

As shown in FIGS. 4 to 6, the notched gear 1 has a notched portion 1a and other tooth surfaces around the periphery, and a cam portion 1 for inserting and ejecting a cassette pack on the surface.
b is formed, and a second hole is formed on the back side around the through hole 1c.
A first locking cam portion 1f is formed on the outer periphery, and a first locking cam portion 1e is formed on the outer peripheral portion. In addition, the first and second locking cam portions 1
The back surface excluding e, 1f and the peripheral portion is dug down to form a dug out portion 1d. This notched gear 1
are the first and second locking cam portions 1e and 1f.
Insert the shaft 3 of the chassis into the through hole 1c so that the back surface on which is formed faces the chassis via the notched gear 2.
is loosely inserted and rotatably placed on the chassis. Note that when the notched gear 1 is placed, it is biased counterclockwise by a spring or the like (not shown).

As shown in FIG. 1 or 2, the lock lever 5 is mounted on the chassis so as to be rotatable about the shaft 6 of the chassis, and a head stand 7 is inserted into a groove-shaped guide hole 5a formed at the end of the lock lever 5. The pin 7a is loosely inserted. Furthermore, an upper lock pin 5b extending upward and a lower lock pin 5c extending downward are formed in the middle of the lock lever 5. As shown in FIG. 3, this lock lever 5 has upper and lower locking pins 5b and 5c, respectively, at a depressed portion 1d of the notched gear 1 and a depressed portion 2c of the notched gear 2.
Notch gear 1 and notch gear 2
inserted between. When the head stand 7 is in the play position and the notch portion 1a of the notched gear 1 faces the gear 4, the upper locking pin 5b is connected to the first notched gear 1 as shown in FIG. It engages with the locking cam portion 1e, and the movement of the notched gear 1 is locked. Furthermore, when the head stand 7 is in the standby position and the first or second notch 2a, 2b of the notch gear 2 faces the gear 4, the lower locking pin 5
c engages with the first locking cam portion 2d of the notched gear 2, and the notched gear 2 is locked in its movement.

The trigger lever 8 is rotatably mounted on the chassis around a shaft 9 of the chassis, the arm extending to the left is inserted between the notch gear 1 and the notch gear 2, and the arm extending to the right is inserted between the notch gears 1 and 2. A groove 8b is formed, and this portion is connected to the movable shaft 10a of the trigger solenoid 10. Near the tip of the trigger lever inserted between the notched gear 1 and the notched gear 2, there is a locking protrusion 8a extending upward as shown in FIG.
is formed, and this locking convex portion 8a enters into the depressed portion 1d of the notched gear 1. The trigger solenoid 10 is not energized and its movable shaft 10
When the trigger lever 8 is extended, the trigger lever 8 is in the state shown in FIG. 8a engages with the second locking cam part 1f of the notched gear 1, and the notched gear 1 is locked in its movement. Similarly, the first or second notched gear portions 2a and 2b of the notched gear 2 are connected to the gear 4.
When the trigger lever portion on the lower side of the locking convex portion 8a engages with the second locking cam portion 2e of the notched gear 2, the movement of the notched gear 2 is locked. .

The gear 4 is a gear that applies rotational force to the notched gear 1 and the notched gear 2, and is rotated counterclockwise by, for example, a tape running motor (not shown).

Next, the operation of this embodiment will be explained.

The notch 1a of the notch gear 1 and the first or second notch 2a, 2b of the notch gear 2 face the gear 4, and the trigger solenoid 10 is not energized and its movable shaft 10a extends. Figure 1 or 2
In the state shown in the figure, since the movement of the notched gears 1 and 2 is restrained by the trigger lever 8, neither of the notched gears 1 and 2 is engaged with the gear 4. At this time, when the head stand 7 is in the play position, the upper locking pin 5b of the lock lever 5 engages with the first locking cam portion 1e of the notched gear 1, as shown in FIG. It does not engage with the first locking cam portion 2d. Therefore, when the trigger solenoid 10 is energized and the trigger lever 8 is slightly rotated counterclockwise to disengage the locking convex portion 8a and the second locking cam portions 1f and 2e, the lock is disconnected. Only the missing gear 2 is unlocked and comes to mesh with the gear 4. When the notched gear 2 meshes with the gear 4, the notched gear 2 also rotates in accordance with the rotation of the gear 4, and the cam portion 2f performs a channel switching operation, and the rotation progresses to the first or second channel. When the notches 2a and 2b face the gear 4 and are about to disengage, the trigger solenoid 10 is de-energized and the trigger lever 8 returns to the position shown in FIG. 1 or 2. Therefore, the movement of the notched gear 2 is stopped again by the lower locking pin 5c of the trigger lever 8.

On the other hand, when the head stand 7 is in the standby position, as shown in FIG.
d, but does not engage with the first locking cam portion 1e of the notched gear 1. Therefore, when the trigger solenoid 10 is energized and the trigger lever 8 is slightly rotated counterclockwise to disengage the locking convex portion 8a and the second locking cam portions 1f and 2e, the In this case, only the notched gear 1 is unlocked and comes to mesh with the gear 4. When the notch gear 1 meshes with the gear 4, the notch gear 1 rotates in accordance with the rotation of the gear 4, and the cam portion 1b performs the insertion or ejection operation of the cassette pack. When the notch 1a faces the gear 4 and is about to disengage, the trigger solenoid 10 is de-energized and the trigger lever 8 moves to the first position.
Since it has returned to the position shown in the figure or FIG. 2, the movement of the notched gear 1 is stopped again by the upper locking pin 5b of the trigger lever 8.

Although the above embodiment is an application of the present invention to a cassette deck, it goes without saying that the invention can also be applied to other devices.

[Effects of the invention] As explained above, in this invention, since a rotating lock lever is used as the lock lever, the force required to move the lock lever is smaller than that of a conventional sliding lock lever, and the load on the members that move the lock lever is reduced. be able to. Also,
Since the lock lever is inserted between the two notched gears and locked from the inside, there is an advantage that all one side of the notched gear can be used as a cam forming area. Furthermore, the use of a rotary lock lever has the advantage that the structure is simpler than the conventional sliding lock lever system.

[Brief explanation of drawings]

FIG. 1 is a plan view of an embodiment of the invention when the headrest 7 is in the play position, FIG. 2 is a plan view of the embodiment of the invention when the headrest 7 is in the standby position, and FIG. In order to clearly show that the lock lever 5 and the trigger lever 8 are inserted between the notched gears 1 and 2, a simplified side view is shown as seen from the direction of the arrow 20 in FIG. FIG. 5 is a plan view of the notched gear 1, FIG. 5 is a rear view of the notched gear 1, FIG. 6 is a sectional view taken along the dashed line 21 in FIGS. 4 and 5, and FIG. 7 is a plan view of the notched gear 2. , FIG. 8 is a rear view of the notched gear 2, FIG. 9 is a sectional view taken along the dashed line 22 in FIGS. 7 and 8, FIG. 10 is a plan view of the conventional gear lock mechanism, and FIG. FIG. 2 is a side view of a conventional gear lock mechanism. In the figure, 1, 2...notch gear, 1a...notch part, 1b, 2f...cam part, 1c, 2g...
Through hole, 1d, 2c...Drilling part, 1e, 2d...
...First locking cam part, 1f, 2e...Second locking cam part, 2a...First notch part, 2b
...Second notch, 3, 6, 9...Shaft, 4...
Gear, 5... Lock lever, 5a... Guide hole,
5b...Upper pin for locking, 5c...Lower pin for locking, 7...Head stand, 7a...Pin, 8...Trigger lever, 8a...Protrusion for locking, 8b...Groove,
10...Trigger solenoid, 10a...Movable axis.

Claims (1)

[Claims for Utility Model Registration] When the predetermined member is in the first position, one of two notch gears that are rotatable independently of each other about the same axis is locked; A gear lock mechanism that locks the other notched gear when a predetermined member moves to a second position, the gear locking mechanism being provided at a position where it contacts and meshes with the outer edges of the first and second notched gears, and which locks the other notched gear. 1st and 2nd
a driving gear that applies rotational force to the notched gear; and mutually opposing surfaces of the first and second notched gears are both dug down, and first and second notched gears are respectively formed at different locations in the dug out portion. a second locking cam portion; and a locking cam portion protruding between the first notch gear and the second notch gear and engaging with each of the second locking cam portions in accordance with the operation of the trigger solenoid. a trigger lever that locks the first and second notched gears; a rotary lock lever that rotates in response to movement of the predetermined member and is inserted between the first and second notched gears; provided on the rotary lock lever, and engaged with either one of the first locking cam portions depending on the position of the predetermined member, so that only one of the first and second notch gears is engaged with the first locking cam portion; A gear lock mechanism characterized by comprising a lock pin for locking the gear.