Device for treating a web

• US 4,014,289 A
• Filed: 09/12/1975
• Issued: 03/29/1977
• Est. Priority Date: 09/12/1974
• Status: Expired due to Term

• Current Assignee: Johannes Zimmer
• Original Assignee: Johannes Zimmer
• Inventors: Zimmer, Johannes
• Primary Examiner(s): Kaplan, Morris
• Application Number:
  US05/612,742
• Time in Patent Office: 564 Days
• Field of Search: 118/406, 118/126, 118/620, 118/119, 118/121, 118/213, 118/122, 101/119-124, 101/382 MV, 101/126, 101/127.1, 101/128.1, 335/230, 335/234, 335/285, 335/295, 335/306, 269/8
• US Class Current: 118/213
• CPC Class Codes: B23Q 3/1543 using electromagnets
• CPC Class Codes: B41F 15/426 the squeegees or doctors being magnetically attracted
• CPC Class Codes: H01F 7/06 Electromagnets; Actuators including electromagnets electric coils H01F5/00; devices for holding workpieces using electric force B23Q3/15; load-engaging elements for lifting articles electromagnetically B66C1/06; electromagnetic couplings F16D27/00; magnetic brakes F16D63/002; electromagnetically operated valves F16K11/24, F16K31/00; analysing materials by magnetic means G01N27/72, G01N27/80; electromagnets for winding mechanical clocks G04C1/02; electromagnetic relays H01H51/00; windings for salient poles of dynamo-electric machines H02K3/18; electromagnets for telegraphic communication H04L; for arc lamps H05B31/28

Abstract

A web treatment element in the form of a roller is attracted to one side of a web by magnetic attraction from a magnetic element positioned on the opposite side of the web. The magnetic element includes a plurality of electromagnets and a switch connected thereto to reverse the polarity of at least a portion of the electromagnets to selectively alter the polarity alignment of the electromagnets.

Claims

1. In a device for treating a web of material, said device being of the type including at least one roller-shaped element formed of magnetically attractable material, said roller-shaped element being positioned on one side of a web of material to be treated and comprising means for applying a treating substance to said one side of said web of material, and a magnetic element positioned on the opposite side of said web of material, said magnetic element including a series of electromagnets arranged one after the other in a longitudinal direction of the magnetic element across the width of the web of material, said magnetic element comprising means for attracting said roller-shaped element and thereby forcing said roller-shaped element against one side of said web of material;

the improvement comprising;

means connected to said electromagnets for selectively reversing the direction of current through the coils of at least a portion of said electromagnets to selectively change the polarity alignment of said electromagnets from a first polarity alignment of alternating polarity between adjacent said electromagnets and a second polarity alignment wherein two adjacent electromagnets are of the same polarity.

2. The improvement claimed in claim 1, wherein said current reversing means comprises a change-over switch connected to said coils of said at least a portion of said electromagnets.