Film feeding device for packaging machine

Abstract

The invention discloses a film feeding device for a packaging machine. The film feeding device comprises a pair of front film feeding pressure rollers and a pair of rear film feeding pressure rollerswhich are arranged on a base plate, wherein the pair of front film feeding pressure rollers comprises a front film feeding upper pressure roller and a front film feeding lower pressure roller which are arranged in an up-down matched mode; and the front film feeding upper pressure roller, the front film feeding lower pressure roller, a rear film feeding upper pressure roller and a rear film feedinglower pressure roller are coaxially and fixedly connected with a front upper gear, a front lower gear, a rear upper gear and a rear lower gear respectively, the four gears are located on the end faces, far away from the four pressure rollers, of the base plate, the front upper gear is matched with the front lower gear, and the rear upper gear is matched with the rear lower gear. The film feedingdevice for the packaging machine has the advantages that the front film feeding pressure rollers drive a friction cone to rotate through a belt wheel, and when different positions of the friction conemake contact with a friction disc through a circular truncated cone structure of the friction cone, the rotating speed of the friction disc is changed, so that the rotating speed of the rear film feeding pressure rollers of the film feeding device is in a controllable state, and the problem of single application range caused by constant rotating speed difference between the front film feeding pressure rollers and the rear film feeding pressure rollers is avoided.

Description

technical field [0001] The invention relates to the technical field of packaging machinery, in particular to a film coating device for a packaging machine. Background technique [0002] The structure of the film loading device in the traditional packaging machine includes: a pair of forward film pressure rollers and a pair of rear film pressure rollers that rotate under the drive of the driving mechanism. The speed of the front film pressure rollers is greater than that of the rear film pressure rollers The speed of the rotating speed, the rear film head of the packaging film after cutting by the cutter can fall on the supporting film plate. When working, the cutting knife cuts the packaging film and the front film is transported to the The bottle conveying plane is used for bottle packaging, and the film head of the rear section of the film falls on the supporting film plate under the cutter, and is pushed forward along the supporting film plate by the rear film feeding pre...

AI Technical Summary

Problems solved by technology

[0005] It is worth noting that, whether it is the traditional technology of the film device or the above-mentioned authorization documents, the rotation speed of a pair of front-feeding film pressing rollers is greater than that of a pair of rear-feeding film pressing rollers. The disadvantage of this solution lies in the actual operation of the staff. It is difficult to control the speed difference between the two pairs of film feeding rollers. If the speed difference is large, the packaging film will be easily deformed and severely vertically torn. If the speed difference is small, the packaging film will not be fully tensioned, especially for different When packaging a bottle with a large size, the movement of the cutter will cause the length of the cut film to change, that is, the speed difference between the two pairs of film feeding rollers needs to be adjusted again to continue to accurately control the tension of the packaging film. Part of the speed difference is more difficult to control, so it takes a lot of time and materials to conduct trial and error experiments every time you switch the size of the packaging bottle, which not only increases the material cost, but also greatly delays the production capacity of the production line. The bottle can be quickly adjusted on the membrane device is particularly important

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