Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Image forming apparatus

An image and surface-mounted technology, which is applied to the electrical recording process using charge graphics, equipment and instruments for the electrical recording process using charge graphics, and can solve problems such as temperature differences and heat that cannot be released

Inactive Publication Date: 2010-02-03
HEWLETT PACKARD DEV CO LP
View PDF2 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the contrary, the heat at the end of the heat roller 15a cannot be released, resulting in a temperature difference

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Image forming apparatus
  • Image forming apparatus
  • Image forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

no. 1 example

[0054] In the first embodiment, in order to cope with the temperature difference in the fixing nip, as image 3 As shown, the gap G1 between the inner thermostat 310 and the surface of the heating roller 210 can be set to be equal to the gap G2 between the outer thermostat 350 and the surface of the heating roller 210, and the response time of the inner thermostat 310 can be set to Different from the response time of the thermostat 30.

[0055] Here, an open type thermostat may be used for the inner thermostat 310 and a closed type thermostat may be used for the outer thermostat 350 in order to set different response times.

[0056] Figure 5A It is an enlarged view showing the structure of the open type internal thermostat shown in IV in the figure. Such as Figure 5A As shown, the open-type internal thermostat 310 includes a housing 311, a bimetal 312 installed in the housing 311 facing the surface of the heating roller 210, an operating pin 313 contacting the surface of ...

no. 2 example

[0060] Figure 7 is a schematic sectional view showing the structure of an image fixing device according to a second embodiment of the present invention. Figure 8A and 8B are shown for Figure 7 Enlarged view of the structure of the thermostat shown in VII and VIII.

[0061] refer to Figures 7 to 8B , to cope with the temperature difference in the fixing nip N, according to the image 3 In the same manner as the case shown in , the gap G1 between the inner thermostat 330 and the surface of the heating roller 210 is set equal to the gap G2 between the outer thermostat 370 and the surface of the heating roller 210, and the operating temperature of the inner thermostat 330 is set to Can be set to a different operating temperature than the thermostat 30 .

[0062] Here, the inner thermostat 330 and the outer thermostat 370 are Figure 6 Closed type thermostat shown in . some components with image 3 and 6 same as shown in . Therefore, the same elements are denoted by the...

no. 3 example

[0068] Figure 9 is a schematic sectional view showing the structure of an image fixing device according to a third embodiment of the present invention. refer to Figure 9 , the gap G3 between the inner thermostat 380 and the surface of the heating roller 210 can be set to be different from the gap G2 between the outer thermostat 390 and the surface of the heating roller 210, and the response time and the operating temperature of the inner thermostat 380 are set respectively Be the same as that of the external thermostat 390.

[0069] Here, the gap G3 is set narrower than the gap G2 so that the heat transferred from the heating roller 210 to the inner thermostat 380 is substantially equal to the heat transferred from the heating roller 210 to the outer thermostat 390 .

[0070] By using a closed thermostat for both the inner thermostat 380 and the outer thermostat 390 or an open thermostat for both the inner thermostat 380 and the outer thermostat 390, the response time of t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

An image forming apparatus, including a heat roller in which a heating source is embedded, a press roller installed close to the heat roller, the press roller contacting the heat roller with a predetermined pressurizing force to form a fixing nip, and at least two overheat prevention devices installed near the heat roller to cut off a power supply to the heating source upon an overheating of the heat roller. One of the overheat prevention devices is installed at portion of the heat roller corresponding to a location within a width of a recording medium passing through the fixing nip and another is installed at a site near an end of the heat roller corresponding to a location outside the width of the recording medium.

Description

technical field [0001] The present invention relates to electrophotographic image forming apparatuses such as printers, copiers and facsimile machines. More particularly, the present invention relates to an image forming apparatus having an improved sensor structure to prevent overheating of a heating member. Background technique [0002] An image fixing device of an electrophotographic image forming apparatus such as a printer, a copier, and a facsimile includes a heat roller having a heat source, and a pressure roller installed adjacent to the heat roller, the pressure roller contacting the heat roller with a predetermined pressure. That is, the image fixing device is configured such that a recording medium having an unfixed toner image thereon passes through a nip between a heating roller and a pressure roller, thereby fixing the image on the recording medium using heat and pressure. [0003] In order to prevent the heating roller from overheating, the image fixing devic...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): G03G15/20
CPCG03G15/2082G03G15/2042G03G15/20
Inventor 姜童周朴勇还林根敏
Owner HEWLETT PACKARD DEV CO LP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com