JPH0345497Y2 - - Google Patents

Description

[Detailed explanation of the invention] Technical field to which the invention belongs This invention unlocks and locks with one rotation of a motor.
The present invention relates to a locking mechanism that outputs a locking signal or an unlocking signal depending on the locked state.

PRIOR ART AND ITS DISADVANTAGES In the past, it was necessary to provide two limit switches each operated in the locked and unlocked positions of the lock.

Therefore, it is not easy to install a limit switch in a lock that is installed in a narrow space, such as an electronic lock. Further, it has been difficult to provide a device that continuously outputs the locked state or unlocked state depending on the rotation angle of the motor.

Purpose of this invention In view of the above points, this invention is capable of continuously outputting a signal indicating locking or unlocking with one limit switch in a lock mechanism that locks and unlocks with one rotation of a motor. An object of the present invention is to provide a locking/unlocking signal output device.

Embodiment of this invention Next, an embodiment of this invention will be described based on the drawings.

1 is a micromotor or other motor, which is given a drive signal from a control circuit not shown,
Rotates by a predetermined angle to lock or unlock. Locks and unlocks with one rotation. A cam 3, which is the most important component of this invention, is fixed to the rotating shaft 2 of this motor.

As illustrated in FIG. 5, this cam 3 has a large arc surface a whose arc angle is slightly larger than 180° with the rotation shaft 2 as the center of the arc, and a large radius of curvature, and a large arc surface a with the rotation shaft 2 as the center of the arc. , has a small circular arc surface b having an arc angle smaller than 180° and a small radius of curvature on opposite sides of the rotating shaft 2, and both arc surfaces are connected by a substantially flat connecting surface c. ing.

The limit switch 4 is provided such that its actuator 5 is in sliding contact with the circumferential surfaces a to c of the cam 3. The radius of the large arc surface a and the radius of the small arc surface b of the cam are such that when the actuator 5 is in contact with the large arc surface a, the switch is either ON or OFF, and when it is in contact with the small arc surface b. When the switch is on, the switch is set to be on or off.

One end of a link 6 is connected to the cam 3 by a pin 7 between the rotating shaft 2 and the large arc surface a or the small arc surface b.

The other end of the link 7 is pivotally connected by a pin 10 to one side of a latch 9 slidably held within the cylinder 8.

The end of the cylinder 8 faces a locked member 11 to be locked by this locking mechanism. The drawing shows an example in which a rotary knob for opening and closing the door of an article storage (locker) is applied to lock/unlock with an electronic lock, and this rotary knob becomes the locked member 11. This member 11 to be locked has a substantially disk shape, and has a groove 12 in a part of its circumferential surface in which the latch 9 can be fitted and locked, and a groove 12 in which the latch 9 can be fitted and locked in another part of its circumferential surface. It has an actuating part 13 which actuates another limit switch 14 when the member is in its normal position (the position where the groove 12 faces the latch 9).

With the above configuration, as shown in FIG. 1, when the latch 9 comes out from the groove 12 of the locked member 11 and is in the unlocked position, the first limit switch
The actuator 5 is in contact with the small arc surface b of the cam 3, and therefore the switch 4 is turned off. This condition continues until the motor 1 is rotated clockwise in FIG. 1 and the tip of the latch 9 exits the tip of the cylinder 8.

Just before the tip of the latch comes out from the tip of the cylinder and fits into the groove 12 of the locked member 11, the actuator 5 of the first limit switch comes into contact with the communication surface c of the cam, and continues in a large circular arc. When it comes into contact with surface a, switch 4 is turned on,
At the same time, the tip of the latch 9 begins to fit into the groove 12 of the locked member.

In other words, when the latch 9 moves to the position where it locks the locked member, the first limit switch 4 is activated.
Turned on. The motor 1 is adapted to rotate 180 DEG and stop rotating when the latch 9 is fully seated within the groove 12, as shown in FIG.

Then, the motor 1 is rotated again, and as shown in FIG. 4, the actuator 5 of the first limit switch 4 is in contact with the large circular arc surface a of the cam until just before the latch 9 escapes from the groove 12 of the locked member 11. Since the switch 4 is turned on, the first limit switch 4 continues to output a signal indicating the locked state. When the latch 9 is moved to the unlocked position out of the groove 12 by the continued rotation of the motor, the first
Limit switch 4 is turned OFF.

Then, when the motor is rotated 180 degrees and the cam 3 is again in the state shown in FIG. 1, the motor is stopped. Therefore, the switch 4 continuously outputs a signal indicating the unlocked state.

In addition, when the unlocking/locking signal output device according to this invention is applied to an electronic lock in which the locking/unlocking control condition is the input of the user's PIN number, etc., the locked member 11 is in the normal position. Sometimes actuating part 1
3, the ON signal of the first limit switch 4 (that is, it is in the locked state as shown in FIG. 3), and the output signal of the closed door detector of the locker, for example. By causing the motor control circuit to rotate 180°, provided that the detection signal satisfies the AND condition and the input password is correct.
It is now possible to unlock the door, and the first limit switch 4 outputs an OFF signal, making it possible to confirm the unlocking.

Also, the output signal of the second limit switch 14 and the OFF signal of the first limit switch 4 (that is, the unlocked state as shown in FIG. 1)
, and the locker door close detection signal satisfy the logical product condition, and the entered password is correct, then the motor control circuit can be locked by rotating it 180 degrees, and the first limit switch is activated. 4 outputs an ON signal, it is possible to confirm that the lock is locked.

In the above example, after the first limit switch 4 is turned ON by the motor control circuit, the motor is stopped after further rotation for a certain period of time. may not necessarily be certain.

The improvement plan shown in Figures 7 and 8 is based on the cam 3A
By devising the shape of the latch 9 and the position of the connection point between the link 9 and the cam, the latch 9 locks when the motor rotates to the unlocked state, that is, as shown in Fig. 7.
When the latch comes out of the groove 12 of the locked member, the first limit switch 4 turns ON (or OFF) to stop the rotation of the motor, and the latch completely enters the groove by rotating the motor and cam at an angle slightly larger than 180°. The first limit switch 4 is turned OFF (or ON) when the motor is in the position or is about to return slightly, thereby stopping the rotation of the motor. In this embodiment, the motor is turned off immediately after the switch is operated. Since it stops, there is no need for a delay circuit,
Locking and unlocking are also reliable.

Effects of this invention As described above, according to this invention, in a lock mechanism in which one end of a link is rotatably linked to a cam fixed to the rotating shaft of a motor, and a latch is provided at the other end of the link, the cam A large circular arc surface having the rotating shaft of the motor as the center of the circular arc and a small circular arc surface having the rotating shaft as the center of the circular arc are provided on opposite sides of the rotating shaft, and both circular arc surfaces are connected by a connecting surface. One end of the link is rotatably linked between the rotating shaft and the large circular arc surface or the small circular arc surface, and the actuator of the limit switch is brought into contact with the circumferential surface of the cam, so that the motor A single limit switch can continuously output a signal indicating the locked or unlocked state as the lock rotates at a predetermined angle, requiring only a minimum of installation space. Convenient to incorporate into mechanisms.

[Brief explanation of drawings]

Figures 1 to 4 show the rotation of the motor, the direction of the cam, and the operational relationship of the limit switch in one embodiment of this invention. Figure 1 is a partially sectional front view showing the unlocked state, Figure 2 The figure is a similar front view showing the state immediately before locking, Fig. 3 is a similar front view showing the locked state, Fig. 4 is the same front view showing the state immediately after unlocking, and Fig. 5 only the cam is extracted. FIG. 6 is a sectional view taken along the line A--A in FIG. 1. FIGS. 7 and 8 are partially sectional front views showing another embodiment in an unlocked state and a locked state, respectively. 1... Motor, 2... Rotating shaft, 3, 3A... Cam, a... Large circular arc surface, b... Small circular arc surface, c... Connection surface, 4... Limit switch, 5... Actuator, 6... ...Link, 9...Latch, 11...
Locked member.

Claims (1)

[Claims for Utility Model Registration] A locking mechanism in which one end of a link is rotatably linked to a cam fixed to a rotating shaft of a motor, and a latch is provided at the other end of the link, (a) the cam is connected to a cam of the motor; A large circular arc surface having the rotation axis as the center of the arc and a small circular arc surface having the same rotation axis as the center of the arc, on opposite sides with respect to the rotation axis, and both the circular arc surfaces are connected by a connecting surface. (b) one end of the link is rotatably linked to the cam between the rotating shaft and the large arc surface or the small arc surface; (c) an actuator of a limit switch is brought into contact with the periphery of the cam; (d) Lock/unlock signal output device.