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Kh-720 _top_ — Cutting Plotter

New Feature Concept: "i-Trace" Intelligent Image Extraction System

The Problem: Users of mid-range cutters like the KH-720 often waste time and expensive vinyl due to "ghost cuts"—where the machine cuts slightly off-registration because the operator didn't perfectly align the material or the media drifted during a long job. Furthermore, converting complex JPEG/PNG logos into clean cut-files usually requires expensive, separate software.

The Solution: The "i-Trace" system integrates a high-resolution optical sensor and built-in processing chip directly into the KH-720 carriage.

1. The Specs: What Does "720" Actually Mean?

The "720" in the model name refers to its maximum media width. It is designed to accept rolls of vinyl up to 72 centimeters wide. This is the "sweet spot" for most sign makers because standard vinyl rolls usually come in 24-inch (61cm) or 30-inch widths.

Key Hardware Features:

  • Digital Control Panel: The KH-720 typically features an LCD screen with a membrane keypad. This allows you to adjust force (pressure) and speed directly on the machine without always relying on the computer software.
  • Stepper Motor: Unlike the quieter servo motors found in high-end machines, the KH-720 usually utilizes a stepper motor. This gives it a distinct, rhythmic sound during operation and provides excellent torque for thick materials.
  • Adjustable Blade Holder: It uses standard vinyl blades (often the red cap or blue cap varieties), allowing users to swap between fine-point blades for detailed vector art and heavy-duty blades for sandblast stencil or thick cardstock.

5. Window Perf and One-Way Vision

The machine can reliably cut window perf vinyl (perforated window film) used for storefront advertising, provided you use a 60° blade.

2. Technical Specifications (Typical)

Based on standard 720mm cutting plotters, the KH-720 likely includes:

| Parameter | Typical Value | |-----------|----------------| | Cutting Width | Up to 630–720 mm (media width up to 800 mm) | | Cutting Speed | 300 – 800 mm/s (adjustable) | | Cutting Force | 10 – 500 grams (digital adjustable) | | Mechanical Resolution | 0.025 mm/step | | Repeatability | ±0.1 mm | | Supported Media | Vinyl, reflective film, heat transfer paper, masking tape, paper (max thickness ~0.3 mm) | | Interface | USB, Serial (RS-232), sometimes SD card slot | | Display | LCD (backlit, 16x2 or similar) | | Blade Type | Drag knife (45° or 30° angle) | | Power Supply | 110–220V AC, 50/60 Hz | | Dimensions (approx.) | 1000 mm (W) x 350 mm (D) x 380 mm (H) | cutting plotter kh-720

10. Comparison to Competitors

| Feature | KH-720 | US Cutter MH-721 | Silhouette Cameo 4 | |---------|--------|------------------|--------------------| | Cutting width | 620 mm | 610 mm | 305 mm | | Max force | 500 g | 500 g | 210 g (but tangential) | | Contour cutting | No (basic models) | Optional sensor | Yes (optical) | | Price range | $250–400 | $300–500 | $300–400 | | Best for | Large stickers, signs | Same as KH-720 | Home craft, HTV |

4. Operational Workflow

How It Works:

  1. One-Touch Vectorization: Instead of needing a PC to trace an image, the KH-720 with i-Trace allows the user to place a printed design or a sketch directly onto the vinyl. The user simply selects "Scan & Trace" on the LCD panel. The sensor scans the image, and the onboard processor instantly generates a vector cut line, creating a perfect contour without needing a computer.

  2. The "Perfect Loop" Registration (for print-and-cut): Standard optical eyes often struggle with glossy or dark vinyl. i-Trace utilizes an Infrared Laser Grid rather than a standard light sensor. Digital Control Panel: The KH-720 typically features an

    • It creates a microscopic grid map of the media surface.
    • It detects the texture and position of printed registration marks with 10x higher accuracy than standard optical eyes.
    • Auto-Correction: If the vinyl is loaded slightly crooked (within 5 degrees), the machine automatically adjusts the cut path to match the skew of the material, preventing wasted cuts.

  3. Material Thickness Auto-Detect: The sensor emits an ultrasonic pulse to measure the exact thickness of the media (from standard vinyl to thick cardstock/flock). It automatically adjusts the blade force (down force) and speed to the optimal settings, eliminating the trial-and-error "test cut" process.

Step 1: Unpack & Assembly

  • Place on a flat, stable surface or attach to optional floor stand.
  • Ensure media guide and pinch rollers are present.

1. Mechanical Architecture: The Foundation of Precision

Unlike lower-tier machines that rely on plastic chassis and friction-based paper feeds, the KH-720 is built around a stabilized aluminum alloy rail and a dual-axis stepper motor system.

  • The Gantry System: The KH-720 uses a cantilevered or supported gantry design (depending on the manufacturing batch—many variants use a dual-rail support). This minimizes deflection during high-speed diagonal cuts. For a machine in this class, the static rigidity is rated for tangential forces up to 500gf without measurable blade wander.
  • Grit Roller & Pinch Rollers: The machine employs a 2mm-thick steel grit roller shaft combined with two independently adjustable pinch rollers. This is critical for the 720mm width: uneven pressure across a 28-inch span can cause vinyl drift (racking). The KH-720’s pinch rollers are spring-loaded with a measured downforce of ~2.5kg each, ensuring consistent media tension.
  • Servo vs. Stepper: This model traditionally uses micro-stepping motors (1/16 step resolution). While not true closed-loop servo, the micro-stepping algorithm reduces low-speed vibration—a common artifact that ruins small letter cutting (e.g., 4mm text).