Rotary Table Piston Clamping Mechanism with Disc Spring

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Solution Overview

Problem

Conventional rotary tables with clamping mechanisms face issues of reduced responsiveness and insufficient clamping torque due to the use of coil springs, and struggle with complex pneumatic paths and difficulty in achieving both clamping and unclamping operations efficiently.

Innovation Solution

A piston-type clamping mechanism with a brake disc and a disc-shaped spring member that uses a biasing means to provide both biasing and rotation stopping functions, driven by operating fluid for responsive clamping and unclamping operations, ensuring sufficient torque and simplicity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Volume of moving object

If a coil spring is used for biasing in the clamping mechanism, then the device can be made compact, but the responsiveness is reduced and more operating fluid is required

Engineering Contradiction:
Improvespace for coil springVSAvoidresponsiveness of clamping mechanism
Core Design Contradiction:
Volume of moving objectVSSpeed

Solution Approach 1:

The invention extracts the coil spring from the clamping mechanism, eliminating it entirely. Instead, a disc-shaped spring member is used solely for the biasing function, while the clamping and unclamping operations are achieved through pneumatic pressure applied directly to the piston, thereby improving responsiveness without requiring space for a coil spring.

Inventive Principle:
Principle #2Taking out (Extraction)

Solution Approach 2:

The invention uses pneumatic pressure applied to the piston to achieve both clamping and unclamping operations. By supplying operating fluid to the piston, the system achieves rapid and responsive clamping action without the mechanical constraints of a coil spring, directly addressing the responsiveness issue.

Inventive Principle:
Principle #29Pneumatics and hydraulics

2Device complexity

If a coil spring is used for biasing, then the device structure is simplified, but the clamping torque becomes insufficient and rotation stopping function becomes difficult to implement

Engineering Contradiction:
Improvestructure of biasing mechanismVSAvoidclamping torque
Core Design Contradiction:
Device complexityVSForce

Solution Approach 1:

The invention segments the functions of the spring member from the clamping mechanism. The disc-shaped spring member is dedicated solely to providing biasing force, while the piston and operating fluid system handle clamping and unclamping operations. This segmentation allows the spring to be optimized for biasing while the pneumatic system provides sufficient clamping torque.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The invention employs pneumatic pressure on the piston to generate sufficient clamping torque, overcoming the limitation of coil springs. The operating fluid provides the necessary force to clamp the brake disc effectively, ensuring adequate clamping torque while maintaining a simple overall structure.

Inventive Principle:
Principle #29Pneumatics and hydraulics

3Force

If a piston structure is used for clamping, then clamping torque is sufficient, but the pneumatic path becomes complicated and operating speed is affected

Engineering Contradiction:
Improveclamping torqueVSAvoidpneumatic path
Core Design Contradiction:
ForceVSDevice complexity

Solution Approach 1:

The invention extracts and eliminates unnecessary pneumatic path components by using the piston directly for both clamping and unclamping operations through a single operating fluid supply. This simplification maintains sufficient clamping torque while reducing pneumatic path complexity and improving operating speed.

Inventive Principle:
Principle #2Taking out (Extraction)

4Device complexity

If a spring member is used for both clamping and unclamping, then the structure is simplified, but pneumatic driving for both operations becomes difficult

Engineering Contradiction:
Improvestructure of clamping mechanismVSAvoidpneumatic driving capability
Core Design Contradiction:
Device complexityVSAdaptability or versatility

Solution Approach 1:

The invention uses pneumatic pressure applied to the piston to achieve both clamping and unclamping operations. By controlling the supply and release of operating fluid to the piston, the system achieves versatile pneumatic driving capability while maintaining a simple overall structure, directly resolving the contradiction between structural simplicity and pneumatic adaptability.

Inventive Principle:
Principle #29Pneumatics and hydraulics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution achieves a simple structure for rotary tables with enhanced responsiveness and clamping torque, enabling efficient clamping and unclamping operations while maintaining a compact design.

Implementation Method 1

The biasing means is fixed by the case and the piston to always bias the piston in a direction of either of clamping and unclamping by a recovery force of elastic deformation.

Methodology Applied
Scientific EffectElastic deformation: Elasticity

Implementation Method 2

The piston is driven by operating fluid in a direction of clamping or unclamping the brake disc.

Methodology Applied
Scientific EffectPneumatic pressure: Pressure Increase

Data Source

PatentUS10029339B2Rotary table
Publication Date: 2018.07.24 FANUC LTD
  • US10029339B2 patent drawing
  • US10029339B2 patent drawing
  • US10029339B2 patent drawing

AI summary

A rotary table includes a clamping mechanism including a piston driven by operating fluid in a direction of either of clamping and unclamping a brake disc, and a biasing means fixed by a case and the piston to always bias the piston in a direction of either of clamping and unclamping the brake disc by a recovery force of elastic deformation.