The present invention relates to a structure of a reel comprising an integrally formed module cover, a central portion defined on the module cover, a first abutting plane and a second abutting plane defined on the module cover. a power device disposed on the first abutting plane, a module frame at the side of the module cover body and accommodating the power device, a joint surface defined at a side of the module frame body and contacting the second abutting plane, and The modular circuit device on the module cover； through the above structural design, it can be clearly seen that the novel structure is relatively simple, so the assembly difficulty can be reduced and the assembly speed can be improved, and the module cover body is integrally formed, and The first abutting plane, the second abutting plane, and the joint surface are horizontally formed by turning, so that the concentricity is greatly improved, thereby achieving the practical progress of the present invention with high concentricity and simple and quick assembly.本新型為有關於一種捲線器之結構，其包括有一體成型之模組蓋體、界定於模組蓋體上之中心部、界定於模組蓋體上之第一抵觸平面和第二抵觸平面、設於第一抵觸平面上之動力裝置、位於模組蓋體側處且收容動力裝置之模組架體、界定於模組架體側處與第二抵觸平面接觸之接合面、及設於模組蓋體上之模組電路裝置；透過上述結構設計，係可清楚看出本新型結構相當簡單，故可降低組裝難度及提升組裝速度，且因模組蓋體由一體成型製成，並第一抵觸平面、第二抵觸平面、及接合面透過車削水平成形，使同心度大幅提升，藉此令本新型達到同心度高且組裝簡單快速之實用進步性。
