Doctor blade, toner cartridge using such a doctor blade and copying process
AssigneeCF Technologies
InventorGino Sirejacob
Life of this patent
Estimating the term…
Abstract
The doctor blade consists of at least a substrate provided with an element having a face adapted for working with a magnetic roller, said element being made at least partly of an elastic material, wherein the face adapted for working with a magnetic roller has an electrical surface resistivity of less than 9.9 1014 Ω per square and wherein the element has thickness of at least 100 μm.
Claims79
A doctor blade consisting of at least a substrate provided with an element having a face adapted for contact with interposition of toner particles a magnetic roller of a machine selected from the group consisting of copier, printer and facsimile machine, said element comprising at least two layers, namely:
- a first layer made of elastic material, said first layer having a thickness of more than 100 μm and a resistivity of more than 10 1014 Ω per square, and
- a second layer covering at least partly the said first layer and having a face adapted for contacting with interposition of toner particles a magnetic roller, said second layer having a thickness of less than 100 μm and an electrical surface resistivity of less than 1013 Ω per square.
A doctor blade consisting of at least a substrate provided with an element having a face adapted for contacting with interposition of toner particles a magnetic roller of a machine selected from the group consisting of copier, printer and facsimile machine, said element comprising at least two layers, namely
- a first layer made of elastic material, said first layer having a thickness of more than 100 μm and a resistivity of more than 10 1014 Ω per square, and
- a second layer covering at least partly the said first layer and having a face adapted for contacting with interposition of toner particles a magnetic roller, said second layer having a thickness of less than 100 μm, an electrical surface resistivity of less than 1013 Ω per square and a resistance against abrasion measured by the ASTM-1938 abrasion test of less than 0.1 g.
A doctor blade consisting of at least a substrate having a free end edge and provided with an element having a face adapted for contacting with interposition of toner particles a magnetic roller of a machine selected from the group consisting of copier, printer and facsimile machine, said element, which is made at least partly of an elastic material, having at least partly a thickness of 100 μm and comprising a layer having a face adapted for contacting with interposition of toner particles a magnetic roller, said layer having an electrical surface resistivity of less 9.9 1014 Ω per square, in which the element is distant from said free end edge of the substrate.
A toner assembly for a copier, printer or facsimile machine comprising at least:
- a container for containing toner;
- a magnetic roller, and
- a doctor blade working with the magnetic roller,
- the said toner assembly having the improvement that the doctor blade consists of at least a substrate provided with an element having a face adapted for contacting with interposition of toner particles the magnetic roller, said element comprising at least two layers, namely
- a first layer made of elastic material, said first layer having a thickness of more than 100 μm and a resistivity of more than 10 1014 Ω per square, and
- a second layer covering at least partly the said first layer and having a face adapted for contacting with interposition of toner particles the magnetic roller, said second layer having a thickness of less than 100 μm and an electrical surface resistivity of less than 1013 Ω per square.
A toner assembly for a copier, printer of facsimile machine comprising at least:
- a container for containing toner;
- a magnetic roller, and
- a doctor blade working with the magnetic roller,
- the said toner assembly having the improvement that the doctor blade consists of at least a substrate provided with an element having a face adapted for contacting with interposition of toner particles the magnetic roller, said element comprising at least two layers, namely
- a first layer made of elastic material, said first layer having a thickness of more than 100 μm and a resistivity of more than 10 1014 Ω per square, and
- a second layer covering at least partly the said first layer and having a face adapted for contacting with interposition of toner particles the magnetic roller, said second layer having a thickness of less than 100 μm and an electrical surface resistivity of less than 1013 Ω per square and a resistance against abrasion measured by the ASTM-1938 abrasion test of less than 0.1 g.
A toner assembly for a copier, printer or facsimile machine comprising at least:
- a container for containing toner;
- a magnetic roller, and
- a doctor blade working with the magnetic roller,
- the said toner assembly having the improvement that the doctor blade consists of at least a substrate provided with an element having a face adapted for contacting with interposition of toner particles the magnetic roller, said element, which is made at least partly of an elastic material, having at least partly a thickness of 10 μm and comprising a layer having a face adapted for contacting with interposition of toner particles of magnetic roller, said layer having an electrical surface resistivity of less 9.9 1014 Ω per square, in which the element is distant from said free end edge of the substrate.
A toner assembly for a copier, printer or facsimile machine comprising at least:
- a container for containing toner;
- a magnetic roller, and
- a doctor blade working with the magnetic roller,
- the said toner assembly having the improvement that the doctor blade consists of at least a substrate provided with an element having a face adapted for contacting with interposition of toner particles the magnetic roller, said element comprising at least two layers, namely
- a first layer made at least partly of polyurethane, said first layer having a thickness of more than 100 μm and a resistivity of more than 10 1014 Ω per square, and
- a second layer covering at least partly the said first layer and having a face adapted for contacting with interposition of toner particles a magnetic roller, said second layer made at least partly of polyurethane and conductive material having a thickness of less than 100 μm and an electrical surface resistivity of less than 1013 Ω per square.
A strip for coating at least partly a face of a substrate of a doctor blade intended to work with a magnetic roller of a machine selected from the group consisting of copier, printer and facsimile machine, said strip comprising at least two layers, namely
- a first layer made of elastic material and provided with means for attaching it on a face of the substrate, said first layer having a thickness of more than 100 μm and a resistivity of more than 10 1014 Ω per square, and
- a second layer covering at least partly the said first layer and having a face adapted for contacting with interposition of toner particles the magnetic roller, said second layer having a thickness of less than 100 μm and an electrical surface resistivity of less than 1013 Ω per square.
A strip for coating at least partly a face of a substrate of a doctor blade intended to work with a magnetic roller of a machine selected from the group consisting of copier, printer and facsimile machine, said strip comprising at least two layers, namely
- a first layer made at least partly of polyurethane, said first layer having a thickness of more than 100 μm and a resistivity of more than 10 1014 Ω per square, and
- a second layer covering at least partly the said first layer and having a face adapted for contacting with interposition of toner particles a magnetic roller, said second layer made at least partly of polyurethane and conductive material having a thickness of less than 100 μm and an electrical surface resistivity of less than 1013 Ω per square.
In a process for printing or copying a document by means of a printer, copier or facsimile machine, in which at least:
- toner is transferred on a magnetic roller;
- a doctor blade contacts said magnetic roller with interposition of toner particles for distributing toner on the magnetic roller;
- toner distributed by the doctor blade of the magnetic roller is transferred on a charge sensible element, and
- toner transferred on the charge sensible element is transferred on a support, said process having the improvement that the doctor blade consists of at least a substrate provided with an element comprising at least two layers, namely
- a first layer made of elastic material having a thickness of more than 100 μm and a resistivity of more than 10 1014 Ω per square, and
- a second layer covering at least partly the said first layer and having a face adapted for contacting with interposition of toner particles the magnetic roller, said second layer having a thickness of less than 100 μm and an electrical surface resistivity of less than 1013 Ω per square.
In a process for printing or copying a document by means of a printer, copier of facsimile machine, in which at least:
- toner is transferred on a magnetic roller;
- a doctor blade having a free end edge contacts said magnetic roller with interposition of toner particles for distributing toner on a magnetic roller;
- toner distributed by the doctor blade of the magnetic roller is transferred on a charge sensible element, and
- toner transferred on the charge sensible element is transferred on a support, said process having the improvement that the doctor blade consists of at least a substrate provided with an element made at least partly of an elastic material, said element having at least partly a thickness of 100 μm and comprising a layer having a face adapted for contacting with interposition of toner particles a magnetic roller, said layer having an electrical surface resistivity of less 9.9 1014 Ω per square, in which the element is distant from said free end edge of the substrate.
In a process for printing or copying a document by means of a printer, copier or facsimile machine, in which at least:
- toner is transferred on a magnetic roller;
- a doctor blade contacts said magnetic roller with interposition of toner particles for distributing toner on the magnetic roller;
- toner distributed by the doctor blade of the magnetic roller is transferred on a charge sensible element, and
- toner transferred on the charge sensible element is transferred on a support, said process having the improvement that the doctor blade consists of at least a substrate provided with an element comprising at least two layers, namely
- a first layer made at least partly of polyurethane, said first layer having a thickness of more than 100 μm and a resistivity of more than 10 1014 Ω per square, and
- a second layer covering at least partly the said first layer and having a face adapted for contacting with interposition of toner particles a magnetic roller, said second layer made at least partly of polyurethane and conductive material having a thickness of less than 100 μm and an electrical surface resistivity of less than 1013 Ω per square.
A process for reconditioning a used doctor blade comprising a substrate, in which a strip made at least partly of an elastic material is glued on the substrate of the doctor blade, said strip comprising at least two layers, namely
- a first layer made of elastic material and provided with means for attaching it on a face of the substrate, said first layer having a thickness of more than 100 μm and a resistivity of more than 10 1014 Ω per square, and
- a second layer covering at least partly the said first layer and having a face adapted for contacting with interposition of toner particles the magnetic roller, said second layer having a thickness of less than 100 μm and an electrical surface resistivity of less than 1013 Ω per square.
A process for reconditioning a used doctor blade comprising a substrate, in which a strip made at least partly of an elastic material is glued on the substrate of the doctor blade, said strip comprising at least two layers, namely
- a first layer made at least partly of polyurethane, said first layer having a thickness of more than 100 μm and a resistivity of more than 10 1014 Ω per square, and
- a second layer covering at least partly the said first layer and having a face adapted for contacting with interposition of toner particles a magnetic roller, said second layer made at least partly of polyurethane and conductive material having a thickness of less than 100 μm and an electrical surface resistivity of less than 1013 Ω per square.
A doctor blade consisting of at least a substrate provided with an element having a face adapted for contacting with interposition of toner particles a magnetic roller of a machine selected from the group consisting of copier, printer and facsimile machine, said element comprising at least two layers, namely:
- a first layer made at least partly of polyurethane, said first layer having a thickness of more than 100 μm and a resistivity of more than 10 1014 Ω per square, and
- a second layer covering at least partly the said first layer and having a face adapted for contacting with interposition of toner particles a magnetic roller, said second layer made at least partly of polyurethane and conductive material having a thickness of less than 100 μm and an electrical surface resistivity of less than 1013 Ω per square.
Dependencies are inferred from the claim text.