Method of seaming wire cloth |
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| 申请号 | US33588973 | 申请日 | 1973-02-26 | 公开(公告)号 | US3828157A | 公开(公告)日 | 1974-08-06 |
| 申请人 | SINCLAIR CO; | 发明人 | MINICK D; | ||||
| 摘要 | Method of seaming metal wire fabric or screen of fine mesh onto a cylindrical support structure, such as a dandy roll or cylinder mould by securing to the structure a first metal wire cloth under layment at least along the seaming site of the fabric. The fine mesh fabric is then wrapped around the structure and tensioned with its ends held in registered, abutting relationship. The fine wire fabric is spot welded along and adjacent its abutting edges to the metal cloth. The welding pulses are controlled as to both shape and number to fuse the two wire materials together without overheating various gauges of metal fabric. | ||||||
| 权利要求 | 1. Method of welding metallic wire screen to a supporting cylindrical structure for use in papermaking, comprising the steps of enveloping the circumference of said structure from endto-end with said screen and tensioning the screen with its ends in abutting end-to-end relationship, welding said screen to said structure at a plurality of sites along the abutting edges of the screen and adjacent thereto with electrical impulses composed of a plurality of pulses and controlling the number and size of said pulses depending upon the gauge of the wire forming said screen. 2. Method of claim 1 in which an underlayment of relatively coarse wire mesh is applied to the cylindrical structure before said screen is wrapped therearound, affixing the underlayment to the structure and then spot welding the screen to said underlayment. 3. Method of claim 1 wherein the underlayment comprises a strip of relatively coarse metallic wire mesh disposed axially along the cylindrical support from end-to-end, the abutting edges of said screen being abutted generally along the central portion of the strip. 4. Method of claim 1 wherein controlling of said pulses is achieved by using a silicon controlled rectifier having an anode-cathode junction in series with the primary winding of a transformer, the secondary of said transformer being electrically connected to a welding electrode, and said rectifier including a control gate in circuit with an electronic trigger control unit. 5. Method of claim 4 wherein said trigger control unit includes a unijunction transistor. |
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