Unwinding mechanism

Abstract

The invention discloses an unwinding mechanism, and belongs to the field of pole piece die-cutting machines. The unwinding mechanism comprises a large plate, an unwinding frame arranged on the large plate, an air expansion shaft connected to the unwinding frame in a sliding manner along the axis direction, and an unwinding assembly for driving the air expansion shaft to wind out a pole piece, theunwinding frame is provided with a first deviation rectifying device, a second deviation rectifying device and a third deviation rectifying device, and the pole piece is conveyed to a die cutting mechanism after being rectified by the first rectifying device, the second rectifying device and the third rectifying device in sequence. According to the unwinding mechanism, the problems that a two-stage deviation rectifying mechanism is adopted in a traditional die-cutting machine, due to the fact that part machining errors and assembly errors exist in a passing roller or a temporary storage roller, the position of the pole piece cannot be quite accurate before the pole piece enters a die, large deviation of the appearance size of a finished pole piece is caused, and risks of battery explosionand like are increased are solved.

Description

technical field [0001] The invention relates to a pole piece die-cutting machine, in particular to an unwinding mechanism. Background technique [0002] At present, pole piece die-cutting machines usually include an unwinding mechanism and a die-cutting mechanism, and the unwinding mechanism sends the pole piece to the die-cutting mechanism at a certain speed for die-cutting. [0003] The unwinding mechanism contains a variety of necessary devices such as tension adjustment devices and buffer devices. After the pole piece passes through these devices and then enters the die-cutting mechanism, there will be a radial offset along the direction of the unwinding roller. Therefore, it is necessary to Add a deviation correcting device in the unwinding mechanism to correct the deviation of the pole piece. [0004] The traditional die-cutting machine adopts a two-stage deviation correction mechanism, that is, the first deviation correction is performed on the pole piece after the a...

AI Technical Summary

Problems solved by technology

[0004] The traditional die-cutting machine adopts a two-stage deviation correction mechanism, that is, the pole piece is corrected for the first time after the inflatable shaft unwinds, and the second deviation correction is carried out by using the traveling deviation correction at the middle position. After the second deviation correction, the pole piece is not directly It enters the mold for die-cutting, but enters the die-cutting machine after passing through a series of passing rollers or buffer rollers. Due to part processing errors and assembly errors in the passing rollers or buffer rollers, the position of the pole piece cannot be very accurate before entering the mold. Accurate, resulting in a large deviation in the appearance and size of the finished pole piece, increasing the risk of battery explosion, etc., so it needs to be improved

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