Dual-Pocket Wrapping Drum Layout for Tear-Free Cigarette Seals
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Solution Overview
Problem
Existing wrapping machines produce high frequencies of cigarette packs with defective sealed wraps, particularly irregular tears at the inner edges of the wrapping sheets, even when operating at high production speeds.
Innovation Solution
A wrapping unit with a unique design featuring a first and second transferring device, each with a common support body and actuator system, allows precise and fast transfer of cigarette groups and wrapping sheets, ensuring seamless folding and sealing into tubular shapes without interference, using a compact and lightweight mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a wrapping machine operates at high production speed to increase productivity, then productivity is improved, but the frequency of defective sealed wraps with irregular tears increases
Solution Approach 1:
The wrapping machine is divided into multiple independent sealing units (first sealing unit and second sealing unit) that operate separately on adjacent pockets. Each sealing unit has its own sealing element and actuator system, allowing independent control and optimization of sealing parameters for each unit, thereby maintaining high quality even at high production speeds.
Solution Approach 2:
The sealing elements are designed to be movable rather than fixed, with actuators that can dynamically adjust the sealing force and timing. The first and second movable sealing elements can be independently positioned and controlled to adapt to variations in pocket position and wrapping sheet tension, ensuring consistent seal quality across different operating speeds.
2Device complexity
If sealing elements are positioned close to pockets to reduce space, then device complexity is reduced, but the sealing quality deteriorates due to interference between adjacent sealing operations
Solution Approach 1:
The first and second movable sealing elements are positioned asymmetrically relative to the pocket arrangement. The sealing elements are located at different distances from the pocket centerline, allowing the first sealing unit to seal the inner edge of the first wrapping sheet while the second sealing unit seals the inner edge of the second wrapping sheet without their sealing zones overlapping or interfering with each other.
Solution Approach 2:
Instead of positioning sealing elements only in the radial direction (close to pockets), the solution introduces a lateral dimension by offsetting the first and second sealing elements in the circumferential direction around the drum. This dimensional separation allows compact radial positioning while maintaining sufficient lateral spacing between sealing operations to prevent interference.
Data Source
Figure 1~2
Figure 3
Figure 4~6
AI summary
A wrapping unit (13) to produce, together, two sealed wraps (3) containing two corresponding groups (5) of smoking articles and comprising: a wrapping drum (18), which is mounted so as to rotate around a rotation axis (19) and supports two pockets (20) side by side, each designed to contain a respective group (5) of smoking articles; a first transfer station (S4), where the two groups (5) of smoking articles are inserted into the two pockets (20); a second transfer station (S3), where the two groups (5) of smoking articles are removed from the two pockets (20); and a first transferring device (27), which is arranged in a transfer station (S4), is configured to move the groups (5) of smoking articles relative to the pockets (20) and comprises two first active elements (31) designed to rest against respective walls of the groups (5) of smoking articles. The transferring device (27) comprises: a single common support body (32), on which the two active elements (31) are fixed, leaving an empty space between the two active elements (31); and an actuator system (33), which translates the common support body (32) relative to the two pockets (20) along a straight transfer direction (D).