Rotating Handle Cam Clamp for Screen Printing
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Solution Overview
Problem
Screen printing press operators experience fatigue and production lag due to the need for excessive manual effort and motion in releasing and actuating clamps, with existing solutions like pneumatic systems being cumbersome, expensive, and unsuitable for multicolor presses, and hand-tool lock clamps offering 'all or nothing' engagement that can disrupt screen registration.
Innovation Solution
A quick actuating and quick release clamp operated by a rotating handle with a cam, allowing variable speed and pressure control, featuring a fixed and movable jaw assembly with a spring mechanism and transfer assembly for precise motion transfer, enabling easy screen changing without re-registration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pneumatic clamping system is used to reduce operator effort and increase speed, then clamping speed and ease of operation are improved, but device complexity and cost increase due to requiring compressors and electrical systems
Solution Approach 1:
The patent replaces complex pneumatic systems with a simple mechanical cam mechanism. The cam profile on the rotating handle directly controls the movable jaw's position, eliminating the need for compressors, valves, and electrical systems while providing smooth, controlled clamping motion through pure mechanical advantage.
Solution Approach 2:
The spring-loaded movable jaw assembly provides automatic return to the open position when the handle is released, eliminating the need for additional actuators or complex release mechanisms. The system uses the operator's rotational input and spring force to automatically cycle through clamping and release phases.
2Productivity
If hand-tool lock clamps are used for quick release, then clamping speed is improved, but manufacturing precision deteriorates due to all-or-nothing engagement causing screen position shifts
Solution Approach 1:
The cam mechanism provides dynamic, variable control over the clamping force throughout the rotation cycle. The cam profile can be designed to provide gradual engagement and release, allowing the operator to control the speed and pressure of jaw closure, thereby maintaining screen registration while enabling quick changes.
Solution Approach 2:
The system allows continuous adjustment of clamping parameters through the rotation angle of the handle. The cam profile transforms rotational motion into controlled linear motion of the movable jaw, enabling variable speed and pressure control during engagement and disengagement to prevent screen shifting.
3Ease of operation
If lock clamps with variable pressure are designed to allow partial engagement, then ease of operation for registration is improved, but device complexity increases due to additional adjustment mechanisms
Solution Approach 1:
The rotating handle with cam serves multiple functions: it provides the clamping force, controls the speed of engagement, adjusts the pressure applied, and enables quick release—all through a single unified mechanism. This eliminates the need for separate adjustment devices while maintaining full control over clamping parameters.
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 clamp provides efficient, ergonomic, and precise clamping with minimal operator effort, allowing for variable pressure and speed during engagement and disengagement, reducing fatigue and production lag while maintaining screen registration accuracy.
Implementation Method 1
A quick actuating and quick release clamp for a screen printing press or other clamping applications. The clamp is operated by a rotating handle which has a cam.
Implementation Method 2
featuring a fixed and movable jaw assembly with a spring mechanism
Data Source
AI summary
A clamp includes a fixed jaw assembly which has a fixed jaw and a movable jaw assembly which has a movable jaw. The movable jaw assembly is movable with respect to said fixed jaw assembly so that the movable jaw moves with respect to the fixed jaw. A handle is rotatably connected to the fixed jaw assembly, the handle includes a cam which moves the movable jaw assembly. When the handle is placed in a first rotational position the jaws are open and the movable jaw is disposed a first distance from the fixed jaw. When the handle is placed in a second rotational position the jaws are closed and the movable jaw is disposed a second distance from the fixed jaw, the second distance being less than the first distance. An adjustment is provided for changing both the first and second distances.