a rotary axis of a driving motor 60 via a chain 62 so that the cylindrical body 50 is rotated according to the rotation of the driving motor 60 because the weaving work of the intrusion sensor net 10 inside the cylindrical body 50 is finished by the unit of the lines where the pins are deployed it is preferable that the cylindrical body 50 is rotated as much as a predetermined interval whenever the weaving work of one or two lines is finished therefore it is preferable that the driving motor 60 is a step motor moreover the cylindrical body 50 is rotated as much as a fixed distance in such a fashion that the driving motor works whenever a user pushes a motor switch 69 once as shown in fig1 the cylindrical body 50 has a plurality of columns of pins d formed along the circumference thereof one of the columns is formed by a plurality of pins deployed in one line and another column located adjacent to the first column has pins deployed at the locations facing the region in between the pins of the first column furthermore the plurality of the pin columns are formed by alternatingly repeating the deployment of the above columns refer to the deployment of the pins of the cylindrical body illustrated in fig1 it is preferable that gaps between the pins and gaps between the columns formed on the cylindrical body are all identical and that the columns are deployed in such a fashion that the pins are deployed at the locations corresponding to the region in between the pins of the neighboring columns additionally the cylindrical body.