Cam-Driven Gripper Assembly With Positioning Jig Alignment
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing grasping devices face challenges in achieving accurate positioning between the groove of the cam and the pin, leading to decreased efficiency of slide movement and wear of the cam.
Innovation Solution
A grasping device with claw holding parts supported by rails, a cam with spiral-shaped grooves, pins engaged with the claw holding parts, and a motor with a shaft fixed to the cam, along with a rail holding part for precise positioning and contact, using press-fitting to secure the cam to the shaft.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a cam with groove or curved hole is used to drive the claw parts, then the claw parts can slide to contact and separate, but accurate positioning during assembling is difficult to achieve
Solution Approach 1:
A positioning jig is introduced as an intermediary tool during the assembling process. The positioning jig includes a positioning surface that contacts the cam and a positioning pin that engages with the pin, ensuring accurate positioning between the cam groove and pin during assembly. This mediator enables precise alignment without requiring extremely high manufacturing precision on the cam and pin themselves.
Solution Approach 2:
The positioning jig is used to perform preliminary positioning actions during assembly. By establishing the correct relative position between the cam and pin before final assembly, the system ensures that the groove and pin are properly aligned. This preliminary positioning action prevents misalignment and ensures efficient slide movement while reducing wear.
2Ease of manufacture
If positioning is not accurately performed, then assembly is simpler, but the efficiency of slide movement decreases and cam wear increases
Solution Approach 1:
The positioning jig serves as a temporary intermediary that simplifies the assembly process while ensuring high positioning accuracy. The jig provides easy-to-understand positioning features (positioning surfaces and pins) that guide the assembly without requiring complex alignment procedures, thereby maintaining both ease of manufacture and slide movement efficiency.
Solution Approach 2:
The system replaces complex mechanical alignment procedures with a simplified positioning jig mechanism. Instead of relying solely on precise machining and complex alignment fixtures, the positioning jig uses simple geometric features (planes, pins) to achieve accurate positioning, making the assembly process easier while maintaining high efficiency.
3Loss of time
If positioning is not accurately performed, then assembly is faster, but cam wear increases
Solution Approach 1:
The positioning jig acts as a temporary intermediary that enables fast assembly while ensuring accurate positioning to prevent cam wear. The jig's positioning features quickly establish the correct alignment during assembly, reducing assembly time compared to traditional methods, while simultaneously ensuring that the cam and pin are properly positioned to minimize wear during operation.
Solution Approach 2:
The positioning jig performs preliminary positioning actions that prevent cam wear before the cam and pin are fully assembled. By establishing correct alignment early in the assembly process, the system prevents misalignment-induced wear while maintaining fast assembly speeds. This preliminary action ensures reliability without sacrificing time efficiency.
Data Source
AI summary
A grasping device of the embodiment includes claw holding parts, a cam, pins, a motor, and a rail holding part. The claw holding parts are supported by rails in a slidable manner. The cam includes grooves or curved holes having a spiral shape provided around the rotation center and a hole provided at the rotation center. The pins each have one end engaged with the claw holding parts side and the other end engaged with the grooves or the curved holes of the cam. The motor includes a shaft to be fixed to the hole of the cam. The rail holding part is configured to hold the rails and engage a positioning jig with an end portion of the shaft at the side fixed to the cam and including a hole part with an inner peripheral surface where the outer peripheral surface of the jig is contactable.