JP2688730B2 - Turntable - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turntable used for changing the direction of an object when parking an automobile or carrying various objects.

[0002]

2. Description of the Related Art For a turntable on which a heavy object such as an automobile is placed, a method of rotating the table with a gear is often used, and there is also a method of combining a rack and a gear. Further, although the Geneva mechanism is suitable for indexing into three or more equal parts, it is possible to divide into two equal parts (180 °) or 180 as in the present invention.
In order to turn back and forth at an angle of around, the Geneva mechanism requires a speed-increasing gear, which is complicated and expensive. Further, in the conventional gear system that does not apply the Geneva mechanism, when a stop command is issued, the brake motor may be electrically stopped by a switch, but it is quite difficult to accurately stop at a predetermined stop position. In this case, in order to soften the impact at the time of starting and stopping, it is necessary to perform electric control with an inverter etc. to gradually increase the speed of rotation of the motor at the time of starting, and to decelerate gradually when stopping. Becomes complicated.

Further, in the conventional method, a large torque is directly required at the time of starting, so that the load becomes large and the output of the motor needs to be large, and if a large motor is built in, the cost becomes high and the turntable becomes expensive. It cannot be lowered. In addition, the base with a built-in motor becomes large and cannot be made lighter.

[0004]

The problems to be solved are to use a small motor, reduce the height to reduce the weight, and adopt a mechanism that does not cause shock when starting and stopping, and simplify the electric control circuit. In addition, the electric capacity should be small and the accuracy of the stop position of the turntable should be improved.

[0005]

For the turntable of the present invention, a Geneva mechanism having a feature of slowly moving at the time of starting and stopping is preferable, but a speed-increasing gear is required for 180 ° turning, which is complicated. There is. The device is simplified by adopting a structure in which the drive shaft is cranked as a means for simplifying the complicated mechanism. Then, the table is slowly moved at the time of starting peculiar to the crank mechanism, the rotation is gradually accelerated, and when stopped, the speed is gradually reduced to be stopped. Furthermore, the mechanism is simple, the driving motor is small, the height of the device is low, and the total weight is light. And the main advantage of the crank mechanism, which has no impact on starting and stopping, is to control the motor simply by switching on and off the electric control device with a simple circuit. It does not require an inverter circuit to control the motor rotation of.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the figures, 1 is a table, 2 is a drive shaft, and 3
A drive plate and a drive pin 4 are movably connected by a connecting plate 5. Six fan-shaped gears are mounted on one table, seven fan-shaped gears are mounted in two symmetrical positions with respect to two drive shafts, and eight teeth are mounted in an intermediate position between two seven-fanted gears. Four drive pins are fixed to the nine arms that project from the two moving shafts. Reference numeral 10 is a drive gear, which is attached to a reduction gear with an 11 motor. The motor has a brake. 12
The switch is for stopping the turning motion, one on each side
It has one. 13 is a base.

FIGS. 1 to 4 show an embodiment of a 180 ° turning turntable. The operation thereof will be described. When a reduction gear with 11 motors rotates, 10 drive gears drive 7 fan-shaped gears. 2 drive shafts rotate in the direction of the arrow, 5 connecting plates pull 3 drive pins, and 1 table starts to rotate slowly. When 1 table reaches the G position shown in FIG. 2, the 7 sector gears are disengaged from the 10 drive gears, and the 6 sector gears are at the position where they start to mesh with the 10 drive gears, which is the switching point of both sector gears. Since the present invention is a mechanism for turning the table through the crank plate through the connecting plate, the turning speed of the table changes even if the angular velocities of the two drive shafts are constant. Therefore, the fan gear is switched at this G point position. I need to do it. When the table rotation reaches the approximately middle position, eight more teeth are engaged. This is because the points A, B, C, D are aligned in a straight line near the intermediate position of the table turning, so that the force that gives rotation to the two drive shafts from one table via the five connecting plates is not generated, so that two drives are performed. Eight teeth are provided to give rotation to the shaft as well. In reality, the inertia of two drive shafts
Even if there are no teeth, the two drive shafts can rotate, but if the rotation of the table stops near the intermediate position due to a power failure or an emergency stop, the device will be damaged if it is started after energizing after that. Since it may occur, it is necessary to add 8 teeth.

After the middle of the turning, the operation is the reverse of the beginning of the table turning, and the rotation is 180 ° while transmitting the rotation to each fan gear, and then slowly stops. At the same time, the rotation of the reducer with 11 motors stops instantly with 12 switches. Then, the braking action holds the two drive shafts in a fixed position to complete the turning. When turning again, the speed reducer with 11 motors is rotated in the opposite direction to gradually increase the speed of the previous operation in the opposite direction, and then the operation of slowly stopping is repeated.

As shown in FIG. 7, the turning angle is not limited to 180 °, but a free turning angle can be selected within a range of 120 ° to 240 °.

FIG. 5 shows a cross section of a conventional turntable in which an internal gear of a turning bare link is meshed with a gear attached to a speed reducer.

[0011]

As described above, as a 180 ° turntable, the turntable of the present invention has a structure in which the crank mechanism and the sector gear are switched and controlled.
Since there is no impact on the stop and there is little play (gap) at the time of stop, the stop position accuracy is good, and since it has a simple structure, the weight can be reduced and the motor can be downsized, and the height of the turntable can be lowered. It can be simple, and the electric control circuit does not need an inverter.

[Brief description of the drawings]

FIG. 1 is a plan view of a turntable of the present invention.

FIG. 2 is a plan view of the turntable of the present invention during turning.

FIG. 3 is a plan view of the turning point of the turntable of the present invention at a midpoint.

FIG. 4 is a front view of the EE cross section of FIG. 3 of the present invention.

FIG. 5 is a cross-sectional view of a conventional gear type turntable.

FIG. 6 is a schematic view showing a turn order of the present invention.

FIG. 7 is a plan view of an application example of a turning angle other than 180 ° of the present invention.

[Description of sign]

 1 table 2 drive shaft 3 drive pin 4 drive pin 5 connecting plate 6 fan gear 7 fan gear 8 teeth 9 arm 10 drive gear 11 motor reducer 12 switch 13 base

Claims (1)

(57) [Claims] 1. A central axis A is provided on a rotatable table,
A drive pin is provided at a point B for applying a rotational force to the table, and a drive shaft C point for driving the table is provided, and a drive pin is also provided at an end D point of the arm protruding from the drive shaft.
Attaching fan-shaped gears to the table side and the drive shaft side, respectively, to a mechanism that transmits the crank motion by connecting the points, D points, and so on with a connecting plate,
A drive gear is provided between them, and a prime mover is connected to the drive gear, and the rotation of the drive shaft and the drive of table rotation are switched by meshing with the fan gear, and both the fan gear on the table side and the drive shaft side are simultaneously driven. A turntable with a structure that meshes with each other to give a rotational force to the table and drive shaft.