Ultra-Thin Mechanical Image Switching System – 20 Images, Endless Loop

# Ultra-Thin Mechanical Image Switching System – Endless Loop (20 Cards) Hello everyone, I previously posted a similar project, but my account was unexpectedly closed for reasons I do not understand, so I was unable to respond to the freelancers who submitted proposals. I am now posting the project again. **Let me explain our project as simply as possible.** We are designing a thin company product catalog measuring 35 × 25 cm. On the left side, there will be a vertical window displaying product images. When the user scrolls a small mouse-style wheel forward with their finger, the next image should appear. Scrolling again should display the following image. The system will contain **20 vertical image cards, each measuring 16 × 6 cm.** ### Dimensions and Requirements - **Panel size:** 35 × 25 cm - **Display window:** 16 × 6 cm (vertical) - **Number of cards:** 20 - **Total thickness:** Maximum 8 mm (including front and back covers) - **Operation:** Fully mechanical, no electronics or motors ### Our 3 Main Requirements **1. Endless Loop** After the 20th card, the system must automatically return to the 1st card. No rewinding or manual resetting should be required. **2. Easy Operation** The user must be able to rotate a small mouse-style wheel comfortably with one finger, without applying excessive force. **3. Accurate Image Positioning** Each wheel movement should bring exactly one new card fully into the display window. Images must not stop halfway or become misaligned. ### Our Initial Mechanism Idea We have considered a system inspired by tank tracks, where thin, interconnected card holders move continuously in a closed loop. The attached illustration is only intended to explain our idea. **You are not required to use this mechanism.** You are free to choose the card material, shape, connections, and movement method. Flexible film, individual cards, or completely different mechanical approaches are all acceptable. ### What We Expect From Engineers Please do not simply write **"I can do this project."** We would like you to briefly explain **which technical approach you would use, how your mechanism would work, and how 20 images could move in an endless loop within a maximum total thickness of 8 mm.** ### IMPORTANT **You do not have to follow our tank-track concept.** We have simply explained what we want to achieve and shared one possible idea. If you have a different mechanical solution that can display 20 images sequentially using a small mouse-style wheel, without rewinding, while meeting the specified dimensions, **we are completely open to your approach.** Thank you.