Point-cutting device for bag making machine

Abstract

The invention discloses an improved point-cutting device for a bag making machine. The point-cutting device comprises a machine frame, a point-cutting sealing knife set and a bag body conveying mechanism, wherein the point-cutting sealing knife set is arranged above the bag body conveying mechanism; the bag body conveying mechanism comprises a transmission roller; and the transmission roller is in transmission connection with a power source. The point-cutting device is characterized in that: the bag body conveying mechanism also comprises a conveying swinging part, wherein the conveying swinging part comprises a swinging bracket; the transmission roller is arranged on the swinging bracket; a sliding rail is arranged on the machine frame; and the swinging bracket moves along the sliding rail through a transmission part under a working condition. In the point-cutting sealing process of a bag body, the conveying swinging part pulls back the bag body to counteract inertia when the bag body is conveyed forwards, so that an instant static state is generated, the bag body is not torn when the point-cutting sealing knife set performs point-cutting sealing, the sealing part is flat, the rejection rate is reduced, and the quality of the plastic bag is improved.

Description

technical field [0001] The invention relates to a bag-making machine, in particular to a breaking device for a plastic bag-making machine. Background technique [0002] At present, roll-type plastic bags are used more and more widely, and the consumption is also increasing. The demand for bag-making machines is increasing, and it also promotes the high-speed development of bag-making machines. When the bag making machine is transporting the bags made of plastic, since the bags of the plastic bags are connected to each other, in order to seal the bag at a proper position, it is necessary to use a point breaking and sealing knife set to The bags being conveyed are sealed with point breaks. And the point-off device of existing bag-making machine has following shortcoming: because the speed when bag body is conveyed is quite fast, and is horizontal conveyance, and point-off sealing knife is done longitudinal point-off sealing action, so when point-off When the sealing knife pe...

AI Technical Summary

Problems solved by technology

And the point breaking device of existing bag-making machine has following shortcoming: because the speed when bag body is conveyed is quite fast, and is horizontal conveying, and point breaking sealing knife is done longitudinal point breaking sealing action, so when point breaking When the sealing knife seals the bag body from top to bottom, the bag body is easily torn, which affects the quality of the bag body, increases the scrap rate, and causes economic losses to the manufacturer

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