JPS6145976Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotational drive device for a turntable. Conventionally, a turntable has been rotationally driven by engagement between a rack and a pinion with a clutch, or by engagement between gears. However, with these drive systems, there is backlash due to backlash when starting and stopping, and in the case of a turntable mounted with a mold casting machine, this has various negative effects on the poured mold. The present invention aims to solve these problems.

The configuration of the present invention will be explained below based on examples. 1 is a turntable, and the turntable 1
A rotation center shaft 4 rotatably supported by a bearing 3 attached to the upper surface of the base 2 on the foundation is fixedly connected to the center of the turntable 1, and below the turntable 1, the upper surface of the pedestal 5 is fixedly connected. receiving roller 6 supported by
A plurality of turntables are arranged, and the turntable 1 is rotatably supported by a receiving roller 6. Furthermore, drive devices 7 are disposed outside the outer circumferential portion of the turntable 1 so as to face both sides of the central axis, so that no horizontal unbalanced load is applied to the rotational central axis 4. Reference numeral 8 denotes a fixed frame installed on the foundation, and a rotary arm 9 is supported on the fixed frame 8 via a support shaft 10 so that its base end can be rotated in the horizontal direction. A piston rod 12a of an air cylinder 12, which is laterally attached to the fixed frame 8 via a support member 11, is connected to the tip side of the rotary arm 9 via a rod member 13. A drive motor 14 for the mold is mounted facing upward, and a drive roller 15 having a rubber tire wrapped around its outer periphery is fitted onto the motor shaft 14a. The drive roller 15 is horizontally rotated about a support shaft 10 together with the rotary arm 9 by the operation of the air cylinder 12, and is provided so as to be able to press against the outer peripheral surface of the turntable 1. At this time, the pressing force of the drive roller 15 against the turntable 1 is controlled to be the minimum force adjusted by a pressure reducing valve that does not lose the output torque of the drive motor 14, so that the pressure between the drive roller 15 and the turntable 1 During this period, no slip phenomenon occurs. Further, in the above embodiment, the drive device 7 was arranged to face the outside of the outer periphery on both sides of the central axis of the turntable 1.
Two or four locations may be arranged at approximately equal intervals. Note that 16 is a multi-pipe joint, and 17 is a rotary joint. With this configuration, the driving roller 15 is rotated together with the rotary arm 9 about the support shaft 10 by the pushing operation of the air cylinder 12, and the driving roller 15 is rotated by adjusting the pressure reducing valve.
When the drive motor 14 is operated in a state where the pressing force against the turntable 1 is controlled to the minimum force that does not overcome the output torque of the drive motor 14, the turntable 1 causes a slip phenomenon between it and the drive roller 15. It rotates reliably without any problems. Further, when the drive motor 14 is stopped, the drive roller 15 is stopped, and the turntable 1, which is driven in contact with the drive roller 15 with appropriate pressure, immediately and smoothly stops without slipping.

In short, the present invention connects a pressure-adjustable air cylinder to the distal end of a horizontally rotatable rotary arm on the outside of the outer periphery of a horizontally rotatable turntable, and also connects a drive motor to the intermediate portion of the rotary arm. A plurality of drive devices, each consisting of a drive roller that is mounted upward and whose outer periphery is covered with an elastic material, is fitted onto the motor shaft and arranged at approximately equal intervals, eliminates the bumps that occur when driving conventional gears. This system improves stopping accuracy, allows smooth start and stop without slipping, and also reduces equipment costs compared to gear drive, and has extremely high practical value, which contributes to this type of industry. is extremely significant.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a front view of FIG. 1. 1: Turntable, 7: Rotating arm, 10:
Support shaft, 12: Air cylinder, 14: Drive motor, 15: Drive roller.

Claims (1)

[Scope of utility model registration request] A rotary arm 9 is rotatably supported in the horizontal direction on the outside of the outer periphery of the horizontally rotatable turntable 1, with its base end being pivoted around a support shaft 10, and the distal end side of the rotary arm 9 and the fixed frame 8 are connected to each other. a pressure-adjustable air cylinder 12 connected between the rotary arm 9 and horizontally rotationally driving the rotary arm 9; and a drive motor 14 mounted upward at an intermediate portion of the rotary arm 9.
The rotary arm 9 is fitted onto the motor shaft 14a of the drive motor 14 and rotated horizontally together with the rotary arm 9 about the support shaft 10 as a fulcrum by the operation of the air cylinder 12, so that it can move toward and away from the outer peripheral surface of the turntable 1. A rotary drive device for a turntable, characterized in that a plurality of drive devices each comprising a drive roller 15 whose outer periphery is covered with an elastic member are arranged at approximately equal intervals.