Automatic fuel-injection device around filter rod making device cutter hair-brush of cigarette making and tipping machine

The utility model discloses an automatic oil jet device for a mouth machine cutter brush of a rolling-joining unit, and the device is arranged adjacent to the mouth machine cutter brush, and comprises a pressure adjusting valve, a barometer, an electromagnetic valve, a negative pressure generator and an oil tank, wherein, the pressure adjusting valve, the barometer, the electromagnetic valve and the negative pressure generator are connected in sequence through a high-pressure air delivery pipe, and the oil tank is connected with the negative pressure generator. The spout of the negative pressure generator is positioned at a distance of 50 millimeters to the right side of the mouth machine cutter brush, the centre of the spout being opposite to the middle part of the brush is in the shape of a vertical T. when in use, high-pressure air enters the negative pressure generator, under the action of the injection force of the high-pressure air, the oil in the oil tank is sucked into the negative pressure generator