The invention relates to a traction three-cots mechanism, in particular to a traction three-cots mechanism of a middle-sealed bag-making machine, belonging to the technical field of bag-making machines. It comprises a traction bracket, and a driving rubber roller, a first driven rubber roller and a second driven rubber roller are rotatably connected to the traction bracket, and the outer circumferential surfaces of the first driven rubber roller and the second driven rubber roller are tangent to the outer circumferential surface of the driving rubber roller. According to the invention, the contact between the film and the rubber roller is changed from the original linear contact to the curved contact, so that the friction resistance is increased and the sliding phenomenon is avoided; The rejection rate is reduced and the product quality is improved.
Three-roller mechanism for sealing machine bow I in patent specification
Technical field
[000 1] The invention relates to a traction three-rubber-roller mechanism, in particular to a traction three-rubber-roller mechanism of a middle-sealed bag-making machine, belonging to the technical field of bag-making machines.
technical background
[0002] Bag-making machines generally include several processing devices, which are connected and driven by driving mechanisms to process plastic films into plastic bags.
[0003] In the production process of bag-making machine, the plastic film is easy to slide because of its smooth surface, so that the bag will not move along the established trajectory, and it is easy to deviate from the straight line during long-distance transmission, resulting in deviation and sliding. As shown in figure 1, rubber rollers are added to the upper and lower surfaces of plastic films at present to increase the movement resistance of plastic films and reduce their sliding phenomenon. In the bag-making machine with double cots, the contact between the film and the cots is linear, so the friction resistance is small and the sliding phenomenon cannot be avoided. At the same time, the rejection rate of production is high.
Summary of the invention
[0004] The purpose of the present invention is to overcome the above shortcomings and provide a traction three-cots mechanism for a middle-sealed bag-making machine. With the adoption of the three-cots mechanism, the contact between the film and the cots is curved, the sliding phenomenon is avoided, the rejection rate is reduced, and the quality of wide products is improved.
[0005] According to the technical scheme provided by the invention, the traction three-rubber-roller mechanism of the middle-sealing bag-making machine comprises a traction bracket, and is characterized in that a driving rubber roller, a first driven rubber roller and a second driven rubber roller are rotatably connected to the traction bracket, and the outer circumferential surfaces of the first driven rubber roller and the second driven rubber roller are tangent to the outer circumferential surface of the driving rubber roller.
In addition, the first driven rubber roller and the second driven rubber roller are symmetrical around the driving rubber roller.
In addition, the first driven rubber roller and the second driven rubber roller are located above the driving rubber roller.
[0008] Compared with the prior art, the invention has the following advantages:
The invention has a simple, compact and reasonable structure, and the contact between the film and the rubber roller is changed from the original linear contact to the curved contact, so that the friction resistance is increased and the sliding phenomenon is avoided; The rejection rate is reduced and the product quality is improved.
Patent drawings
Brief description of drawings
[0009] Figure 1 is the structural schematic diagram of the traction mechanism of two cots in the existing bag-making machine. ..
[00 10] fig. 2 is a schematic structural diagram of the present invention.
[00 1 1] Description of reference number: 1_ traction bracket, 2- driving rubber roller, 3- first driven.