Date Indicating Device With Spring Clamp And Adjustable Knobs

The patent replaces the mechanical/adhesive label system with a direct optical marking system. The date indicating device uses a light source and transparent or translucent marking members that project date information directly onto the container surface, eliminating the need for physical labels that can fall off or smear. This substitution of the marking mechanism resolves the contradiction by maintaining ease of operation through electronic control while achieving reliability through direct optical projection that cannot be physically compromised.

The patent creates an optical copy of the date information that is projected onto the container rather than physically attaching a label. The date indicia are generated electronically and optically reproduced on the container surface, allowing the date to be displayed without physical contact. This copying approach maintains ease of operation through digital manipulation while achieving durability since the optical copy cannot be smeared or detached like physical labels.

The patent replaces traditional mechanical marking methods (writing instruments, stickers, pens) with an optical projection system. This substitution maintains simplicity by using electronic controls and pre-programmed date sequences, while dramatically improving accuracy through controlled light projection that cannot be smudged or faded. The optical system ensures precise, legible date indication that remains clear throughout the food storage period.

The patent changes the physical state of the date marking from material-based (ink, adhesive) to energy-based (light projection). By transitioning from matter to electromagnetic radiation for the marking process, the system achieves both simplicity through electronic control and precision through the inherent stability of optical parameters. The light-based marking maintains consistent brightness, clarity, and accuracy without degradation over time.

The patent replaces manual writing operations with an automated optical projection system controlled by electronic components. This substitution dramatically increases productivity by eliminating the manual writing process entirely, allowing dates to be projected instantly onto multiple containers. The accuracy of date information is improved by using electronic date generation and projection, which eliminates human errors in writing dates such as incorrect numbers or illegible handwriting.

The patent implements a self-service marking system where the device automatically generates and projects dates without requiring manual intervention for each marking action. The system can autonomously cycle through date sequences, project dates onto multiple containers in succession, and maintain accurate time tracking without human input. This automation increases productivity by eliminating repetitive manual writing while ensuring information accuracy through programmed date sequences that prevent human error.