Compact Strapping Head Using Single Linear Cam
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Solution Overview
Problem
Conventional strapping heads are bulky and cumbersome due to complex transmission mechanisms and mixed actuations, making them difficult to handle and maintain, and existing attempts to divide the head into two assemblies have not resulted in a compact and lightweight solution with high precision and control.
Innovation Solution
A strapping head design featuring a single linear cam with cam profiles on both horizontal and vertical planes, driven by a single actuation motor, and utilizing a screw spindle and nut transmission mechanism for precise control, allowing for a compact and lightweight structure suitable for easy handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional strapping heads use multiple rotating cams and complex transmission mechanisms, then they can achieve reliable strap launching and welding functions, but the head becomes bulky and heavy making it difficult to handle and maintain
Solution Approach 1:
The invention divides the strapping head into two main assemblies: a strap launching assembly and a welding assembly. This segmentation allows each assembly to be optimized independently, reducing the overall complexity and weight while maintaining functional reliability. The launching assembly contains the motor and cam mechanism, while the welding assembly contains the welding device and cutting device, enabling separate maintenance and replacement.
Solution Approach 2:
The invention uses a linear cam mechanism instead of traditional rotating cams. The linear cam translates linear motion into the required reciprocating motions for strap launching and welding operations. This dimensional change from rotational to linear motion eliminates the need for complex rotation mechanisms and reduces the overall size and weight of the strapping head.
2Ease of operation
If conventional strapping heads use multiple rotating cams on orthogonal planes, then they can control various displacement members, but the space occupation increases and manufacturing complexity rises
Solution Approach 1:
The linear cam mechanism serves multiple functions simultaneously: it controls the strap launching motion, the welding device positioning, and the cutting device operation. By consolidating these control functions into a single linear cam instead of multiple rotating cams on orthogonal planes, the invention reduces transmission mechanism complexity while maintaining control precision.
Solution Approach 2:
The linear cam acts as an intermediary mechanism that converts the linear motion from the motor into the complex reciprocating motions required for strap launching and welding. This single intermediary replaces multiple cam-and-follower systems, simplifying the overall transmission mechanism while preserving the ability to precisely control various displacement members.
3Ease of operation
If conventional strapping heads use mixed actuations including pneumatic systems, then they can achieve certain control functions, but the overall bulk increases and force capability decreases
Solution Approach 1:
The invention merges the actuation systems by using a single motor to drive the linear cam, which in turn controls all the moving components. This eliminates the need for separate pneumatic actuation systems, reducing the overall volume of the strapping head while maintaining adequate control capability through the mechanical advantage of the cam mechanism.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design achieves a significant reduction in weight and bulk, enabling easy handling while maintaining high precision and control, simplifying maintenance and reducing manufacturing costs by eliminating the need for large rotating cams and complex transmission mechanisms.
Implementation Method 1
a single linear cam apt to move alternately in the longitudinal direction through a second actuation motor and having cam profiles both on an horizontal plane and on a vertical plane, and said linear cam is actuated by said second driving motor being integral in rotation with screwed spindle transmission means mutually cooperating with screw nut means integral with said linear cam
Data Source
Figure 1A~1B
Figure 2A
Figure 2B
AI summary
A strapping head for a strapping machine is disclosed, comprising a containment frame (C) suitable to house at least a strap launch/rewind path defined by a launch/tensioning assembly (1) comprising a plurality of driving wheels (10, 11, 12, 13, 14, 15) of said strap, a welding assembly (3) and a gripping and cutting device (2) comprising locking grippers, a moving abutment plate and a cutter, said driving wheels of the launch/tensioning assembly being brought into rotation by a first actuation motor (M1), wherein all of said launch/tensioning assembly (1), welding assembly (3) and gripping and cutting device (2) have driving members driven into movement through a single linear cam (4) apt to move alternately in the longitudinal direction through a second actuation motor (M2) and having cam profiles both on an horizontal plane and on a vertical plane, and said linear cam (4) is actuated by said second driving motor (M2) being integral in rotation with screwed spindle transmission means mutually cooperating with screw nut means integral with said linear cam (4).