Dispenser for dispensing a flat sheet-like product
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Solution Overview
Problem
The existing paper dispenser mechanisms often malfunction due to difficulties in adjusting the spring force required to return the empty pivot lever, which must be strong enough to reliably swing it upwards but weak enough to be tensioned by the reduced reserve roll, leading to reliability issues.
Innovation Solution
The pivoting lever is coupled to the housing cover, eliminating the need for a return spring by using a kinematic coupling mechanism that relies on the lid's opening and closing movement to return the lever to its waiting position, facilitated by a coupling element with a slot and hook-like end, and a second pivoting lever for controlling the dispensing roll's support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a return spring is used to swing the pivot lever upwards, then the lever can be returned to its waiting position, but the spring force must be precisely adjusted to be strong enough to reliably pivot the empty lever while weak enough to be tensioned by the reduced-diameter reserve roll, leading to malfunction
Solution Approach 1:
The patent removes the return spring from the system entirely. Instead of using a spring to return the pivot lever to its waiting position, the invention uses the weight of the reserve roll itself and the geometric arrangement of the guide track to automatically return the lever. This eliminates the need for spring force adjustment and the associated reliability problems.
Solution Approach 2:
The patent designs the guide track with specific geometric characteristics that create a self-balancing system. The track's shape allows the pivot lever to move freely in one direction (when the reserve roll diameter decreases) while automatically returning in the opposite direction through gravitational force and track geometry, without requiring additional spring force.
2Ease of operation
If the pivot lever is moved back and forth multiple times per reserve roll, then the reserve roll can be properly transferred, but the mechanism requires frequent movements increasing the risk of malfunction
Solution Approach 1:
The patent designs the guide track to enable continuous, smooth movement of the pivot lever from the waiting position to the dispensing position and back. The track's geometric design ensures that the lever moves continuously without abrupt stops or reversals, reducing mechanical stress and the likelihood of malfunction during the transfer process.
Data Source
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AI summary
Dispenser for dispensing a web-shaped sheet product, in particular paper, comprising a housing (1) that can be closed by a preferably pivotable lid (10), and at least one pivot lever (5) arranged in the housing, with which a reserve roll (2) of the web-shaped sheet product can be moved from a waiting position to a dispensing position, wherein the at least one pivot lever (5) is coupled to the lid (10) of the housing (1) in such a way that when the lid (10) is opened the pivot lever (5) can be returned from the dispensing position to the waiting position.