JPH0478059A - Geared motor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a geared motor used in an autoloading/ejecting mechanism of a microfloppy disk.

(Prior Art) A geared motor is used in an auto-eject mechanism of a micro-floppy disk, and is configured to perform one eject operation in one rotation of its output gear. On the other hand, recently, it has been considered that the loading operation is performed by a half-rotation operation, and the ejecting operation is performed by the remaining half-rotation operation.

Fig. 4 shows the planar configuration of a geared motor used in a mechanism that performs such autoloading/ejecting operations. 1 is a gear case, and a motor 2 is attached to the lower side of the gear case I. Each of the intermediate gears 3 is attached to the upper side of the gear case l so as to be interlocked with each other, and an output gear 4 is further provided so as to be interlocked with the final intermediate gear 3. A cover 5 is provided to cover the intermediate gear 3. An output pin 7 serving as an output engagement portion is provided at an eccentric position on the output gear 4 surface.

Reference numeral 10 denotes a lever for moving a cassette for mounting a floppy disk, which is not shown in the figure, and an opening-shaped engagement portion 11 that engages with the output pin 7 is provided at the end of the lever 10.

FIG. 5 shows the bottom configuration of the geared motor, in which a cam 13 is attached to the shaft of the output gear 4, with operating portions 12a and 12b protruding on both sides.

Further, on one side of the cam 13, a switch 17 having a movable contact 15 and a fixed contact 16 is arranged. The movable contact 15 is displaced and separated from the fixed contact 16 by being pressed by the operating portions 12a and I2b of 13.

FIG. 6 shows its circuit configuration, in which a starting signal circuit 18 is provided in parallel with the switch 17, and 20 is a resistor for braking the motor 2.

The operation of the geared motor in the above configuration will be explained with reference to the time chart of FIG.

The initial output gear 4 position is the first stop position.

When a starting signal pulse is given to the motor 2 via the starting signal circuit I8 by a command operation and the output gear 4 is rotated in the direction of the arrow a, the lever 10 is moved to the output pin 7 along with this rotation.
is moved in the direction of the arrow to the dotted line position.

In the above, when the movable contact 15 is released from being pressed by the actuator 12a due to the rotation of the cam 13 with the start of rotation of the output gear 4, the movable contact 15 returns and the switch 17 turns ON, thereby causing the start signal pulse to be activated. Even after being turned off, the output gear 4 continues to rotate, and when the output gear 4 rotates half a turn, the actuating part +2b presses the movable contact 15, so the motor 2 is stopped, and the output pin 7 is moved to the dotted line position (second stop position). )
It is now located in The lever 10 is moved by the above-mentioned half-rotation of the output gear 4, for example, an eject operation is performed, and then a start signal pulse is given, the motor 2 is activated, and the output gear 4 is turned half-rotated, so that the lever 10 is moved. 10 is moved in the opposite direction C to perform a loading operation.

(Problem to be solved by the invention) As mentioned above, the switch 17 used in the conventional
When the switch 17 is OFF, the motor 2 starts operating with the start signal pulse, both during the eject operation and the loading operation, and the switch ! The rotation is continued by the ON operation of switch 7, and then switch 17 is set to 0FFL.
The motor 2 is configured to be stopped when the switch is turned on.

If the timing between OFF and the start signal pulse is out of order, the motor will not operate normally.

For example, in the time chart, the OF of switch 17 is
The reason why the motor stops after F is due to inertia, and the amount of rotation due to this inertia varies depending on each motor, and if the amount of rotation based on this inertia is too small or too large, the above timing error is likely to occur. Become. Therefore, in the past, there was a problem in that determining the start signal pulse length, designing the motor characteristics, reduction ratio, etc. required a great deal of time.

The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to enable easy determination of starting signal pulse length, design of motor characteristics, reduction ratio, etc.

(Means for solving the problem) In order to achieve such an object, in the present invention,
In a geared motor comprising a motor, an intermediate gear interlocking with the motor, and an output gear interlocking with the intermediate gear, the output gear is provided with one switch actuating section that operates a switch in accordance with the rotation of the output gear. A number of switches corresponding to the number of deactivations of the output gears are provided in the vicinity of the output gear so as to be actuated by the switch actuating section, and the motor is controlled based on the switch signals of the respective switches. It was configured so that it would take place.

(Operation) According to the above configuration, the motor is controlled based on the switch signals of the switches whose number corresponds to the number of deactivated output gears.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the drawings. FIG. 1 is a bottom view of a geared motor used in an autoloading/ejecting mechanism for a microfloppy disk according to an embodiment of the present invention.

In these figures, 1 is a gear case, 2 is a motor, and 4 is a gear case.
is an output gear, I3 is a cam, and the configuration including basic elements including these is similar to that shown in the conventional example, and its planar configuration is the same as that of the conventional example.

In the present invention, a switch 19 is provided in addition to the switch 17 as a switch corresponding to the cam 13, and the cam 13 is provided with only one operating portion 12.

FIG. 2 shows the circuit configuration, switch I9 is switch 17
It is arranged so that it is located in parallel with.

The circuit of the switch 17 and the switch 19 is configured to be selectively given an activation signal pulse.

The operation will be explained with reference to the time cheer shown in FIG.

When the output gear 4 is in the first stop position, a start signal pulse is given to the switch 19 which is turned ON by command operation of the motor 2, and the output gear 4 is rotated in the direction of the arrow a.
With this rotation, the lever 10 is moved in the direction of the arrow in the state of engagement with the output bin 7 to the dotted line position (second stop position).

In the above, the starting signal pulse continues until the switch 9 is activated by the actuator 12 and its movable contact 21 is separated from the fixed contact 23, turning off the motor 2.
The output gear 4 is stopped after inertial rotation due to the OFF operation of 9, and the output gear 4 is thereby rotated 1000 revolutions and is located at the second stop position.

Next, the activation signal pulse is applied to the other switch 17 in the same manner as described above, so that the lever 10 is moved in the opposite direction, and the output gear 4 is rotated to the third stop position.

As mentioned above, since the two switches 17 and 1.9 are provided and the activation signal pulse is given through each switch 17.19, the activation signal pulse width is longer than the OFF timing of the corresponding switch 17.19. It only needs to be set.

In the above embodiment, two switches are provided, but it is also possible to provide three switches.

(Effects of the Invention) As is clear from the above explanation, according to the present invention, the motor is controlled based on the switch signals of the switches of the number corresponding to the number of output gears that stop operating. Pulses can now be set with a margin for each switch, making it easier to determine the start signal pulse length, and design motor characteristics and reduction ratios.

[Brief explanation of the drawing]

The figures relate to an embodiment of the present invention, FIG. 1 is a bottom view of a geared motor according to an embodiment of the present invention, FIG. 2 is a circuit configuration diagram thereof,
FIG. 3 is a time chart diagram for explaining the operation. FIG. 4 is a plan view of a geared motor according to a conventional example of the present invention, FIG. 5 is a bottom view of the same, FIG. 6 is a circuit diagram of the conventional example, and FIG. 7 is a time chart for explaining the operation of the conventional example. It is a diagram. 2...Motor, 3...Intermediate gear, 4...Output gear, 12...-Switch operating section, 17.19...Switch.

Claims (1)

[Claims] [1] A geared motor comprising a motor (2), an intermediate gear (3) interlocked with the motor (2), and an output gear (4) interlocked with the intermediate gear (3). , the output gear (4) is provided with a switch actuator (12) that operates a switch in accordance with its rotation; A number of switches (17) and (19) corresponding to the number of stops are provided to be operated by the switch actuating section (12), and the motor (2) is operated based on the switch signals of the switches (17) and (19). ) is a geared motor that is configured to be controlled.