Rotatable Gripping Device for Ring Spinning Machine Doffing
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Solution Overview
Problem
Existing doffer devices for spinning machines are inefficient due to time-consuming movements and require excessive space, leading to lost spinning time and stability issues.
Innovation Solution
A method and device with a rotatable gripping system attached to a beam, allowing for horizontal or vertical movement of gripping devices to efficiently remove full bobbins and place empty tubes on spindles without extending the machine's width, utilizing cylindrical or conical grippers and indicators for precise positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a conventional doffer device with multiple gripping devices is used, then each spinning station has its own gripping device for removing bobbins and placing spools, but the beam must move long distances during standstills resulting in time loss
Solution Approach 1:
The patent applies dynamics by making the gripping device rotatable rather than fixed. The rotatable gripping device can quickly reposition between spinning stations without requiring long beam travels, thereby reducing doffing time while maintaining productivity.
Solution Approach 2:
The empty spool is grasped in advance before the doffing operation begins. This preliminary action allows the gripping device to already hold the replacement spool when it arrives at the spinning station, eliminating waiting time and improving overall doffing efficiency.
2Productivity
If a doffer device with rotating discs and gripping elements is used, then the doffing speed is improved, but the space requirement along the longitudinal axis increases
Solution Approach 1:
The patent transitions from a longitudinal arrangement (rotating discs along the axis) to a transverse arrangement (rotatable gripping device mounted on a beam). This dimensional change allows the doffing mechanism to operate in a different spatial plane, reducing the longitudinal space requirement while maintaining doffing speed.
Solution Approach 2:
The rotatable gripping device provides dynamic repositioning capability that achieves fast doffing without requiring the extended longitudinal space of fixed rotating disc systems. The rotation occurs in a compact configuration that fits within the available machine width.
3Ease of operation
If the doffer tilts sideways to perform doffing operations, then the gripping elements can access the spindles, but the machine width increases
Solution Approach 1:
The patent uses a rotatable gripping device that can dynamically adjust its position and orientation. Instead of permanently tilting the entire doffer structure sideways, the gripping device rotates to the required angle only when needed, maintaining a compact machine width while preserving full doffing capability.
Data Source
Figure 1a~1f
Figure 1g~1j
Figure 2a~2f
AI summary
A method for removing full bobbins (7) from spindles (8) of a ring spinning machine (1) and placing empty cores (5) onto the spindles (8) using a doffer (1) is disclosed. The doffer comprises a beam (2) and a rotatable gripping device (3) attached to the beam (2), with a core gripper (41) and a bobbin gripper (42). The doffer (1) is arranged next to the ring spinning machine (1). According to the invention, the beam is raised vertically, and the gripping device is extended from the beam over the full bobbin (7). The invention also relates to a doffer with corresponding drives.