Your Professional Positive Cam Opening Device Supplier
Jiangsu Senhong Machinery Co., Ltd. is a professional manufacturer specializing in cam shedding mechanisms, electronic dobbies, and supporting equipment for water jet and air jet looms. Backed by an experienced engineering and production team, the company focuses on continuous product development and reliable manufacturing quality. Senhong operates a modern factory with integrated machining and assembly production lines to support stable production and efficient delivery. The facility is equipped with advanced CNC machining centers, CNC lathes, coordinate measuring machines, laser cutting machines, heat treatment equipment, and automated coating lines, ensuring precision manufacturing and consistent product performance for domestic and international customers.
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![Positive Cam Shedding Device]()
Positive Cam Shedding DeviceThe Positive Cam Shedding Device stands as a cornerstone in textile machinery, delivering dependable and economical shedding performance for standard woven fabric production. Engineered with...view more -
![High-performance Positive Cam Opening Device]()
High-performance Positive Cam Opening DeviceEngineered for mills seeking the perfect balance between speed and fabric quality, the High-performance Positive Cam Opening Device delivers enhanced capabilities for medium to high-speed weaving...view more -
![Fully Enclosed Positive Cam Opening Device]()
Fully Enclosed Positive Cam Opening DeviceThe Fully Enclosed Positive Cam Opening Device is engineered as the definitive protective solution for weaving mills facing dusty, humid, or otherwise harsh operating conditions.view more -
![Ultra-wide Positive Cam Opening Device]()
Ultra-wide Positive Cam Opening DeviceEngineered specifically for weaving machines with reed widths from 380 cm to over 550 cm, the Ultra-wide Positive Cam Opening Device is a dedicated technical solution for producing extra-wide fabrics.view more -
![Large Box-type Positive Cam Opening Device]()
Large Box-type Positive Cam Opening DeviceThe Large Box-type Positive Cam Opening Device is an engineering masterpiece designed not merely for size, but for superior stability and the control of a high number of heald frames (typically 20+).view more -
![High-speed Fully Enclosed Positive Cam Opening Device]()
High-speed Fully Enclosed Positive Cam Opening DeviceThe High-speed fully enclosed positive cam opening device represents the ultimate synthesis of two core demands: extreme operating speed and absolute environmental protection.view more -
![Compact High-speed Fully Enclosed Cam Opening Device]()
Compact High-speed Fully Enclosed Cam Opening DeviceIt achieves a remarkable 20-30% reduction in housing volume without sacrificing high-speed capability or protective sealing, making it the perfect fit for next-generation looms with limited space,...view more -
![High Speed and High Performance Positive Cam Opening Device]()
High Speed and High Performance Positive Cam Opening DeviceThis high-speed, high-performance positive cam opening device is designed to meet the immense challenges of modern ultra-high-speed looms (operating at speeds exceeding 900 rpm), representing the...view more -
![Large Box Positive Cam Shedding]()
Large Box Positive Cam SheddingThe Large Box Positive Cam Shedding is our entry-level model in the cam shedding product range. We specifically designed it for high-performance water-jet and air-jet looms.view more -
![High Speed Fully Enclosed Cam Shedding]()
High Speed Fully Enclosed Cam SheddingThe High Speed Fully Enclosed Cam Shedding is our upgraded model for high-speed air-jet and water-jet looms. Unlike open designs, this unit uses a fully sealed box structure.view more -
![Compact High Speed Cam Shedding]()
Compact High Speed Cam SheddingThe Compact High Speed Cam Shedding is our solution for customers with limited installation space. This unit keeps the core positive conjugate cam technology while using a smaller box structure.view more -
![Cam Shedding Mechanism]()
Cam Shedding MechanismThe Cam Shedding Mechanism is the key unit that controls heald frame lifting and lowering to form the shed. Our product uses the positive conjugate cam principle.view more
Why Choose Us
Continuous Product Innovation
The company has independently developed multiple cam shedding mechanisms and electronic dobby models compatible with different loom systems, supporting diverse textile production requirements.
Production & Quality Control
Integrated machining and assembly production lines help ensure efficient production processes, consistent quality standards, and reliable delivery schedules.
Sales Market
Our products are widely used in China, Southeast Asia, the Middle East, and other international markets, including India, Indonesia, Vietnam, and Pakistan.
Our Certificate
Our company has passed the internationally recognized ISO9001 Quality Management System certification, audited and certified by SGS.
Positive Cam Shedding Device
A ositive Cam Shedding Device is a precision-engineered mechanical component designed to convert rotational input into controlled linear or oscillating motion with extremely high repeatability. It operates through a fixed cam profile that guides followers along a predetermined path, ensuring exact and predictable movement throughout each cycle.
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Type of shedding |
Positive conjugate cam |
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Installation type |
In high position |
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Cam numbers |
4-10 |
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Pitch |
12mm |
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Lubrication |
Oil-bath self-lubrication |
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Separation method |
Special tool separation |
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Cycle wefts |
4-6 |
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Suitable looms |
Water-jet looms |
Features of Positive Cam Shedding Device
Continuous Contact
The follower is constrained within a groove or track on the cam, ensuring it remains in constant contact throughout the cam's rotation.
Elimination of External Forces
Unlike systems that depend on springs or gravity, positive cam mechanisms do not require additional forces to maintain contact between the cam and follower.
High Precision
The direct engagement allows for accurate control of the follower's motion, which is crucial in applications requiring exact timing and movement.
Advantages of Positive Cam Shedding Device
Reliability
The constant engagement between cam and follower reduces the risk of mechanical failure due to disengagement.
Durability
With fewer components like springs that can wear out, positive cam systems often have longer service lives.
Consistency
They provide uniform motion, which is essential in processes where timing and synchronization are critical.
Conjugate Cam Shedding (Most Common)
Uses two separate cam discs per heald frame: one for lifting, one for lowering.Followers stay in constant contact with both cams, eliminating backlash or free play.
Double-Lift (Grooved) Cam Shedding
Uses a single cam with a closed groove to lift and lower the heald frame.Simpler and compact, but groove limits cam shape complexity and wears faster.
Rotary Positive Cam Box
Modular unit with multiple cam sets (usually 6–14) in an oil bath.Mounts directly to the loom frame and is driven by the main loom motor.
Eccentric (Crank) Cam Shedding
Uses an eccentric disc (offset circle) instead of a shaped cam.Produces sinusoidal motion, suitable for simple weaves like plain weave.
Textile Machinery: In weaving machines, positive cam shedding mechanisms control the movement of heald shafts, enabling the formation of sheds for weaving. These systems are preferred for their ability to handle high-speed operations and produce consistent fabric patterns.
Automated Manufacturing: In automated assembly lines, positive cam systems ensure synchronized movements of components, leading to efficient and accurate production processes.
Mechanical Clocks and Timing Devices: The precision of positive cam mechanisms makes them suitable for controlling the timing of events in mechanical clocks and other timing devices.
Key Components of Positive Cam Opening Device
Camshaft: Rotates at half the loom speed (for one pick per cam rotation) or synchronised with the loom cycle.
Conjugate Cams (or double cams): Two complementary cam discs per heald frame – one controls upward motion, the other controls downward motion, eliminating any play.
Cam Followers (Rollers): Rollers that ride on the cam surfaces.
Lever System (Treadle levers): Transmits cam motion to the heald frame.
Pull rods and Connecting links: Transfer force from levers to the heald frame.
Heald frame: Carries the heddles through which warp yarns pass.
Working Principle of Positive Cam Shedding Device
Cam (Driving Member)
A precisely machined rotating disc with a custom-designed profile (groove or track) that dictates the follower's motion
01
Follower (Driven Member)
A roller or knife-edge element that rides inside the cam's groove, constrained so it cannot leave the track under any operating condition
02
Conjugate Cam Pair
Two cams work together — one controls the rise (opening), the other controls the return (closing) — ensuring the follower is positively driven in both directions
03
Connecting Rod Return
The heald frame is returned by a connecting rod mechanism, synchronized with the cam motion
04
Harness Frame / Heald Shaft
The output element that physically lifts/lowers the heddles to form the shed
05
Maintenance
Lubrication and Oil Supply
Daily checks of cam surfaces, followers, and pivot points are necessary to ensure proper oil supply. The oil tank level must stay within the recommended range. Pumps, filters, and tubing should be inspected weekly for blockages or leaks. Contaminated oil must be replaced immediately to prevent cam wear and shedding timing errors that cause fabric defects.
Cam and Follower Inspection
Cam discs and followers should be checked every shift for wear, pitting, or chipping. Rolling followers and bearings must spin smoothly with no play or damage. Even small cam shape changes can cause irregular heald movement, leading to uneven weave or yarn breakage. Worn parts must be replaced immediately. Dimensional checks using gauges should be done monthly.
Timing and Clearance Adjustment
Cam phase and clearances must be set correctly for good loom performance. Shed positions should align with beat-up and let-off motions as required by the weave design. All clearances between cams, followers, heald frames, and guide bars must stay within manufacturer tolerances. Settings should be rechecked whenever fabric type or pattern changes to maintain weaving quality.
Troubleshooting Common Problems
Common issues include heald drop, uneven sheds, abnormal noise, and vibration. Heald drop is usually caused by worn cams, loose bolts, or low oil pressure. Uneven sheds often come from wrong cam phasing or bent heald frames. Strange noises typically mean bearing failure or misalignment. The loom must be stopped immediately, and the root cause should be found and fixed before restarting.
Certificates
FAQ
As one of the leading positive cam opening device manufacturers in China, we warmly welcome you to buy high-grade positive cam opening device made in China here from our factory. All customized products are with high quality and competitive price. Contact us for quotation.
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