Transport Roller With Receiving Areas For Sheet Extraction
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Solution Overview
Problem
Existing devices for removing sheets from a stack, such as valve bags, face issues with reliable detection and alignment of the front section by transport and pressure rollers, leading to potential deformation and malfunction when the sheet is pulled out, especially if it is not straight and horizontally aligned.
Innovation Solution
The transport roller features axially spaced cylindrical support areas with smaller receiving areas, allowing the suction gripper to be partially immersed, ensuring the sheet is forcibly and reliably guided between the transport and pressure rollers, even in case of unintentional deformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the front section of the workpiece is pulled out using friction between transport and pressure rollers, then the workpiece can be extracted from the magazine, but the front portion may be deformed or become unintentionally deformed during extraction
Solution Approach 1:
The suction gripper preliminarily grasps the front end of the workpiece and pulls it out of the magazine before the transport rollers engage. This preliminary action positions the workpiece for subsequent gripping by the rollers, ensuring the front portion is already extracted and ready for controlled transport without risking deformation during the pulling-out phase
Solution Approach 2:
The suction gripper acts as an intermediary device between the magazine and the transport rollers. It temporarily holds and manipulates the front portion of the workpiece, facilitating its extraction and positioning it correctly for the transport rollers to grip and convey it without causing deformation
2Ease of operation
If the suction gripper grasps the front end of the workpiece, then the workpiece can be pulled out, but the front portion must maintain straight horizontal orientation to be gripped by friction
Solution Approach 1:
The suction gripper performs preliminary grasping and extraction of the front end, positioning it in a predetermined orientation before the transport rollers engage. This preliminary positioning ensures that when the rollers subsequently grip the workpiece, it is already in the correct straight horizontal orientation needed for reliable friction-based gripping and transport
Solution Approach 2:
The suction gripper uses pneumatic suction forces to grasp and manipulate the front portion of the workpiece, replacing purely mechanical friction-based gripping in the extraction phase. This pneumatic grasping mechanism provides more reliable and controllable holding forces, ensuring the front portion maintains proper orientation during extraction before mechanical friction gripping takes over
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
This configuration ensures reliable transfer of the sheet from the suction gripper to the transport roller, preventing deformation and ensuring smooth extraction, even when the sheet is not perfectly aligned.
Implementation Method 1
a suction gripper movable below the dispensing opening with a vertical movement component for grasping and removing a front section of a bottom surface structure of the stack from the dispensing opening
Implementation Method 2
The suction box grips the workpiece in such a way that a part of the workpiece protrudes forward beyond the suction box, with the protruding part of the workpiece entering between the transport and pressure rollers and being gripped by friction
Data Source
Figure 1
Figure 2
AI summary
Device for removing sheet components from a stack, comprising a magazine for receiving a stack of sheet components, which has two opposing side walls, a magazine base (8) and a rear wall (12), wherein a removal opening (14) extending between the side walls and having a front edge (16) and a rear edge (18) is formed in the magazine base, comprising a rotatable transport roller (34) whose axis of rotation is perpendicular to the side walls of the magazine, a pressure roller (36) arranged above the transport roller, movable with a vertical movement component relative to the transport roller and rotatable about an axis of rotation parallel to the axis of rotation of the transport roller, wherein at least one of the transport roller and the pressure roller is rotatably driven, and a suction gripper (30) movable with a vertical movement component below the removal opening.wherein the transport roller (34) has at least two axially spaced support areas (38) designed to interact with the pressure roller, with a support diameter, between which at least one receiving area with a smaller diameter is formed, wherein the suction gripper is at least partially movable into the at least one receiving area.