Servo Cam Feed Roller Control for Press Material Handling
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing press feed mechanisms face limitations in inter-adjustability and control of grip and release forces, leading to inefficiencies and material damage during the transfer of uncoiled steel sheets to downstream stamping operations, particularly due to uncontrolled lift rates and pressures.
Innovation Solution
A servo-operated feed assembly with a cam lift mechanism, combined with continuous force hold-down components and a programmable counterbalance system, allows for precise and rapid incremental grip and release of the upper feed roller, enabling controlled transfer of uncoiled material with adjustable lift and return rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional cam feed apparatus with air cylinders are used to release the feed roller, then the feed roller can be lifted to allow material passage, but the lift rate and pressure are uncontrolled causing material damage and marking
Solution Approach 1:
The patent replaces the traditional pneumatic cylinder system with a servo motor-driven cam mechanism. The servo motor provides precisely controlled rotational motion that translates to controlled linear displacement of the cam follower, which in turn controls the feed roller lift. This substitution of pneumatic control with servo-mechanical control enables programmable, repeatable, and precisely adjustable lift rates and pressures, eliminating the uncontrolled rapid lifting that causes material marking while maintaining high feed rates.
Solution Approach 2:
The patent implements programmable control over multiple parameters including lift distance, lift rate, dwell time, and return rate. These parameters can be adjusted and stored as recipes for different material types and thicknesses. By changing these parameters dynamically, the system optimizes the feed roller release characteristics to prevent material marking while maintaining high productivity, directly addressing the contradiction between fast feeding and material protection.
2Speed
If the upper feed roller is rapidly released from the lower roller, then feed speed increases, but the uncontrolled return motion causes material damage
Solution Approach 1:
The patent replaces the passive mechanical return motion of traditional cam mechanisms with an actively controlled servo motor system. The servo motor can independently control both the outward stroke (roller release) and return stroke (roller engagement) with programmable velocity profiles. This allows the system to achieve rapid roller release for high feed speed while simultaneously controlling the return motion to be gradual and controlled, preventing material damage from uncontrolled impact.
Solution Approach 2:
The patent implements dynamic control of the cam mechanism through servo motor actuation. The cam profile and servo motor velocity profile work together to create dynamically optimized motion patterns. The system can adjust the timing, velocity, and acceleration profiles of both the release and return motions, enabling rapid release when needed while ensuring a controlled, damage-free return to the gripping position.
3Device complexity
If fixed cam profiles are used in press feed mechanisms, then the mechanism is simple, but inter-adjustability between rollers is limited
Solution Approach 1:
The patent replaces fixed mechanical adjustment mechanisms with a programmable servo control system. Instead of physically reconfiguring cam profiles or mechanical linkages to change roller engagement characteristics, the system uses software-programmed servo motor commands to achieve different motion patterns. This maintains the mechanical simplicity of the cam-follower geometry while adding electronic programmability for infinite adjustability of lift distance, timing, and force characteristics.
Solution Approach 2:
The patent transforms the static, fixed cam profile system into a dynamic, programmable system. The servo motor can vary the rotational speed, acceleration, and timing of the cam mechanism to achieve different effective cam profiles without physically changing the cam geometry. This allows the same physical mechanism to adapt to different material thicknesses, feed rates, and press requirements through software control.
4Manufacturing precision
If manual adjustment of stroke cylinders is used, then material thickness clearance can be optimized, but the operation is not rapid or repeatable
Solution Approach 1:
The patent replaces manual mechanical adjustment of stroke cylinders with automated servo motor control. The servo system receives digital inputs for desired lift distance and material thickness, then automatically calculates and executes the precise motion required. This eliminates manual measurement and adjustment operations, providing both high precision (through programmable control) and high speed (through automated execution), while also enabling repeatable production of identical settings.
Solution Approach 2:
The patent implements a self-adjusting system where the servo motor automatically positions the feed roller based on programmed parameters for material thickness and required clearance. The system performs its own adjustment without operator intervention, using stored recipes or real-time measurements to set the optimal lift distance and timing, thereby achieving both precision and rapid setup.
Data Source
AI summary
A feed assembly for transferring an uncoiled sheet material to a downstream material forming operation. The assembly includes upper and lower feed rolls between which the sheet material passes, the upper roll being actuated between engaging or disengaging positions relative to an upper surface of the sheet material. At least one continuous force applying component is provided for exerting a hold down force against the upper feed roll and, in combination, a programmable counterbalance component is calibrated to counter the hold down force exerted by the force applying component and in order to cycle the upper roller between the engaged and disengaged positions during advance cycling of the uncoiled material to the downstream forming operation.