Sheet Conveying Device Blocking Member Rotation Mechanism
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Solution Overview
Problem
Conventional sheet conveying devices with shutters face limitations in increasing throughput due to the need for a longer sheet interval and slower conveyance speed, as the shutters require time to return to the standby position for obliquity correction, restricting the minimum sheet interval and conveyance speed.
Innovation Solution
A sheet conveying device with a blocking member and positioning unit that allows the blocking member to rotate in the same direction as the sheet conveyance after the trailing end passes, enabling a shorter sheet interval and higher conveyance speed by quickly returning to the standby position for the next sheet.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional shutters are used to correct sheet obliquity, then obliquity correction is achieved, but sheet interval increases and throughput decreases
Solution Approach 1:
The patent inverts the conventional shutter return mechanism by using the sheet itself to drive the shutter return. Instead of the shutter returning autonomously against spring force, the sheet passing through the nip forces the shutter to return to its initial position, converting the sheet's forward motion into shutter reset action and eliminating the need for long return intervals
Solution Approach 2:
The shutter mechanism performs self-service by using the sheet that is being conveyed to automatically return the shutter to its initial position. The sheet's passage through the nip between rollers and shutter creates the forcing action that resets the shutter, making the system self-regulating and eliminating external reset mechanisms
2Productivity
If sheet conveyance speed is increased to improve throughput, then productivity increases, but the shutter cannot return to standby position in time for obliquity correction
Solution Approach 1:
The shutter is positioned in advance at the correct location upstream of the nip, and the timing is arranged so that the sheet forces the shutter to return to its initial position just as the next sheet is about to enter the nip, ensuring obliquity correction is ready before the sheet arrives regardless of conveyance speed
Solution Approach 2:
The system uses feedback from the sheet's passage through the nip to automatically adjust shutter positioning. The sheet's physical interaction with the shutter creates a feedback loop where the sheet's own motion triggers the shutter reset, ensuring synchronization with the conveyance speed
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 allows for a higher throughput by enabling a shorter sheet interval and increased conveyance speed while maintaining effective obliquity correction, addressing the limitations of conventional devices.
Implementation Method 1
a positioning unit that positions the blocking member to be in a standby position by applying an urging force to the blocking member
Data Source
AI summary
A sheet conveying device includes a blocking member having a blocking surface with which a leading end of a sheet that is being conveyed comes into contact for obliquity correction. The blocking member is rotated by being pushed by the sheet against an urging force of a positioning unit that positions the blocking member to be in the standby position. The blocking member is rotatable to be in a sheet-passage-allowing orientation in which the sheet is allowed to pass. When a trailing end of the sheet that is being conveyed has passed the blocking member, the blocking member that is in the sheet-passage-allowing orientation rotates in a same direction as a sheet conveyance direction and is positioned to be in a standby position.