Paper Cutting Device Cam Spacing Mechanism
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Solution Overview
Problem
Conventional sheet cutting devices often cause sheet buckling and jamming due to the movable blade interfering with the tip edge of subsequent sheets, especially when cutting adhesive label sheets, as the blade returns to its open position after cutting, leading to curling and hooking issues.
Innovation Solution
A sheet cutting device with a moving mechanism to place the movable blade at an open position, a biasing mechanism to ensure smooth cutting, and a spacing mechanism using a cam and cam follower to move the blade away from the fixed blade after cutting, preventing interference and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the movable blade returns to the open position after cutting, then the blade can receive the next sheet, but the cutting edge of the movable blade interferes with the tip edge of the subsequently fed sheet and hooks it up
Solution Approach 1:
The spacing mechanism is activated in advance during the blade's return movement to create separation between the movable blade and fixed blade before the sheet tip reaches the cutting zone. This preliminary spacing action prevents the harmful hooking effect from occurring in the first place
Solution Approach 2:
The spacing mechanism acts as an intermediary element that mediates between the movable blade and the sheet tip. It introduces a controlled gap that allows the sheet to pass through without direct contact with the movable blade's cutting edge, thereby preventing adhesion and hooking
2Manufacturing precision
If the sheet is fed obliquely to improve printing quality, then linear transport along the platen is achieved, but the tip edge of the sheet becomes out of the fixed blade cutting edge and interferes with the movable blade path
Solution Approach 1:
The spacing mechanism creates a preliminary gap during the blade's return stroke, positioned exactly where the obliquely fed sheet tip will pass. This advance preparation ensures that even with oblique feeding, the sheet tip never contacts the movable blade
Solution Approach 2:
The spacing mechanism applies the spacing function locally at the critical zone where the sheet tip passes near the movable blade path. Rather than moving the entire blade assembly, only the relevant portion is spaced away from the fixed blade, maintaining cutting precision while preventing interference
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
Prevents sheet curling and jamming by ensuring the movable blade does not hook or pull up the tip edge of subsequent sheets, allowing them to pass through without obstruction, even when fed obliquely, thus maintaining smooth cutting operations.
Implementation Method 1
the movable blade is biased toward the fixed blade by a spring or the like
Implementation Method 2
a spacing mechanism configured to move the movable blade away from the fixed blade against a biasing force of the biasing mechanism
Data Source
Figure 1
Figure 2
Figure 3(a)~3(c)
AI summary
[Problem] To prevent a movable blade from interfering with a sheet during movement of the movable blade to an open position after cutting the sheet with the movable blade, thereby preventing the sheet from being curled up and jammed from as a result of being hooked on the movable blade. [Solution] A sheet feeding device includes a moving mechanism (20) configured to move the cutting edge (Ba) of the movable blade (B) away from the cutting edge (Aa) of the fixed blade A to move the cutting edge (Ba) of the movable blade (B) from an open position (X) where the fed sheet (S) is received and to place the cutting edge (Ba) of the movable blade (Ba) at the open position; a biasing mechanism (35) that biases the movable blade (B) toward the fixed blade (A) so that the cutting edge (Ba) of the movable blade (B) can slide against the cutting edge (Aa) of the fixed blade (A); a spacing mechanism (40) configured to make the movable blade (B) away from the fixed blade (A) against a biasing force of the biasing mechanism (35) during a process of allowing the movable blade (B) to reach the open position (X) after cutting of the sheet S with the movable blade (B). The spacing mechanism (40) includes a cam (41) provided on the fixed blade (A) side and a cam follower (42) in contact with the came (41) provided on the movable blade (B) side.