 Contact brush |
| What is claimed is: 1. A contact brush preferably for use in electrical machines which comprises a ... |
|
| Carbon brush for miniature motors and method of making same |
| OF THE EMBODIMENT Carbon brushes for miniature motors have heretofore been manufactured by adding ... |
|
| Low circulation loss compound brush |
| A conventional brush is in general made of a single material. During commutation, the conductive ... |
|
| Lead sulfide activation process |
| I claim: 1. The process of photosensitizing lead sulfide comprising adding a persulfate solution to ... |
|
| Liquid ink fusing system |
| I claim: 1. A reproducing machine of the type having a latent image recorded on a member, wherein ... |
|
| Fiber optic sensor with dual condition-responsive beams |
| In accordance with the present invention, a sensor is provided in which an optical fiber extends ... |
|
| Micromachine transducer with cantilevered movable portion |
| It is an object of the present invention to provide a micromachine in which no specific package ... |
|
| Microvalve |
| While the way in which the present invention addresses the various disadvantages of prior art ... |
|
| Heat transfer conduit |
| I claim: 1. A heat transfer conduit for attachment by welding to the end of a vessel comprising a ... |
|
| Continuous mechanical iron pouring line |
| What is claimed is: 1. An automatic continuous pouring line for transferring predetermined amounts ... |
|
|
Temperature sensing and control of a fusing roll
| Details |
Inventors: White, William E.;
Assignee: Eastman Kodak Company (Rochester, NY)
Primary Examiner: Mayewsky; Volodymyr Y.
Assistant Examiner:
Attorney, Agent or Firm: Sales; Milton S.
Apparatus for controlling the surface temperature of a fusing roller of the type having a heat-insulative, release surface over a thermally conductive core, by (1) internally heating the core, (2) sensing the temperature of the core rather than of the external release surface, (3) providing different temperature control settings for the core sensor and (4) selectively switching the internal heating means into operative relation with a predetermined control setting in anticipation of changes in heat loss from the external surface. The core of the fusing roll is thereby controlled toward the different temperature control settings, one at the "copy run" condition, another at the "idle" condition, and in some instances the same control setting is used for the "copy run" and the "idle" condition. Such core temperature settings are selected to create the particular temperature differentials across the heat-insulative roll cover that are necessary to counteract the different heat losses which occur during running and idling conditions in order to maintain the proper external release surface fusing temperature. |
|
DETAILED DESCRIPTION Description:
FIELD OF INVENTION The invention relates to improved roller fusing apparatus for electrographic devices and more specifically to improved apparatus for controlling the temperature of the fusing surface of such apparatus.
DESCRIPTION OF PRIOR ART It is well known in the art of electrographic roller fusing that the exterior surface temperature of fusing rollers must be maintained at a temperature which is high enough that proper fusing will result and offsetting will be eliminated, but not so high as to char the support material passing through the rollers, injure the roll coating, add excessive curl to the support material or cause the support material to stick to the rolls.
Proper temperature control for the fusing surface has therefore presented a problem to all roller fusing devices.
The various prior art devices have attempted to control the temperature of the roller fusing surface by using thermocouples, thermistors and the like to sense directly the temperature of the exterior surface itself.
In response to sensing of a temperature outside the desired fusing temperature range, the fuser heating source is appropriately controlled to return the fusing surface to the proper temperature.
Several problems have resulted from use of such surface sensing apparatus, including for example, damage to the fusing surface by the sensor, and destruction of the temperature sensor itself since the sensor is usually placed in close proximity to the path of the paper.
Economically, sensors that detect surface temperature without damaging the fusing surface and yet are accurate and dependable are in many cases more expensive to manufacture and mount, than the type of sensor which could be used to sense the core of the roll.
One particularly desirable type of fusing roller employs a fusing surface of offset preventing material such as Teflon or silicone rubber.
However, these offset preventing, i.
e.
, "release", materials have a very poor heat conductivity and because of such, substantial differences in temperature between the parts of the fusing surface that do and do not contact the support medium result
|
| Related patents |
|
|
Combination heat absorber and heat storage system
As shown in FIG. 1, a trailer type dwelling unit comprises a foundation 1, vapor barrier 2, floor support 3, floor 4, walls 5, ceiling 6, ceiling support 7, and roof 8. ...
|
|
|
Structural solar collector assembly
With the above objectives in mind, it is among the primary objectives of the present invention to provide a support system which is adaptable to be utilized as a ...
|
|
|
Durable antistatic coating for polymethylmethacrylate
What is claimed is: 1. A method of providing a durable, optically clear, transparent, antistatic coating on the surface of a transparent solid polymethacrylate article ...
|
|
|
Flame retardant plasticizer formulation for polyvinyl chloride containing dimethyl methylphosphonate for haze reduction
What is claimed: 1. An improved flame retardant, plasticizer formulation comprising a polyvinyl chloride compatible plasticizer and a haloalkyl phosphate flame retardant,...
|
|
|
Novel alcohols
What is claimed is: 1. Dialcohols of the general formula ##EQU3## wherein R is phenyl; R.sub.1 and R.sub.2 are each hydrogen, or methyl. 2. 1,6-Diphenyl-trans-hexene-(3)-...
|
|
|
Water-soluble coating composition
OF THE INVENTION The butadiene lower polymers used in the present invention are butadiene polymers containing a large proportion of 1,2-double bonds or a large ...
|
|
|
Solar radiation absorbing panel
The solar radiation absorbing panel of the present invention, shown generally at 1, is illustrated in FIG. 1 in connection with a typical flat plate solar collector ...
|
|
|
Solar heat control apparatus for a body of water
Having thus described this invention, what is claimed is: 1. A solar heat control apparatus for a body of water comprising a structural frame adapted to be supported at ...
|
|
|
Spray nozzles
We claim: 1. In a spray nozzle that includes: a housing having a fluid inlet and a first and a second group of fluid spray discharge outlets; means in said housing ...
|
|
|
Method for the pyrometallurgical production of copper
The present invention provides a method in which economical copper production is rendered possible with the greatest possible reduction of copper losses. The result is ...
|
|
|
Heat Accumulators 
