Intermittent gear mechanisms use periodic transmission to achieve precise indexing control. They are widely used in automated equipment that needs repeated start-stop cycles.
Core Application Areas
① Automated Packaging Machinery
Film positioning and sealing: In bag-making packaging machines, the mechanism feeds film at a fixed length and pauses accurately for cross sealing and cutter action.
Canning indexing turntable: In beverage filling lines, the rotary table turns a fixed angle, such as 90° or 120°, then pauses. This allows bottle loading, filling, capping, and bottle discharge in sequence.
② Printing Equipment
Paper feed mechanism: Label printers and receipt printers use intermittent gears for intermittent paper feed. This maintains print positioning accuracy, usually with error under 0.1 mm.
Screen printing platen positioning: During printing, the table moves to the print position and stops accurately.
③ Machine Tools
Multi-spindle drilling machine indexing: For example, in a 6-station drilling combination machine, the spindle indexes 60° after each drilling operation.
Automatic lathe feeding: The intermittent drive feeds bar stock in fixed amounts, with feed accuracy of ±0.05 mm.
④ Light Industry Assembly Equipment
Toy and electronics assembly turntable: An 8-station assembly table rotates 45° after each station operation.
Matchbox filling machine: At set intervals, it pushes a fixed number of matches into the paper box.
Specific Parameter Characteristics
Motion cycle: Common transmission ratios are 1/4, 1/6, and 1/8 (drive gear revolutions : driven gear revolutions).
Pause duration ratio: Usually 30% to 70% of the motion cycle, adjustable by tooth profile modification.
Positioning accuracy: General machining can reach ±0.5°. Precision grade can reach ±0.1° with an added locating pin.
Maximum speed: Conventional mechanisms ≤ 300 rpm. High-speed models can reach 800 rpm with special dynamic balancing.
Technical Advantages and Limitations
Advantages:
Simple and compact structure. Lower cost than cam indexers.
Rigid positioning without an additional clutch.
Easy maintenance and high reliability. Mean time between failures > 10,000 hours.
Limitations:
Rigid impact during start and stop. High-speed applications need a buffer device.
Indexing position cannot be adjusted dynamically, unlike servo indexing mechanisms.
Gear meshing clearance causes small positioning errors.
Selection Notes
For heavy loads, use 20CrMnTi carburized and hardened gears with hardness HRC58-62.
For food and pharmaceutical equipment, use stainless steel such as 304/316L.
For high-speed applications, perform dynamic balancing with unbalance ≤ G6.3 grade.
A photoelectric sensor is recommended for closed-loop position detection.
For custom gears or indexing components, Hansheng Automation can machine them from customer drawings in single pieces or small batches.
