CA1143429A - Pneumatic/spring actuation mechanism for roll fuser - Google Patents
Pneumatic/spring actuation mechanism for roll fuserInfo
- Publication number
- CA1143429A CA1143429A CA000347989A CA347989A CA1143429A CA 1143429 A CA1143429 A CA 1143429A CA 000347989 A CA000347989 A CA 000347989A CA 347989 A CA347989 A CA 347989A CA 1143429 A CA1143429 A CA 1143429A
- Authority
- CA
- Canada
- Prior art keywords
- rolls
- pressure
- roll
- pair
- pneumatic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
- G03G15/00—Apparatus for electrographic processes using a charge pattern
- G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
- G03G15/2003—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat
- G03G15/2014—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using heat using contact heat
- G03G15/2017—Structural details of the fixing unit in general, e.g. cooling means, heat shielding means
- G03G15/2032—Retractable heating or pressure unit
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fixing For Electrophotography (AREA)
Abstract
ABSTRACT
Apparatus for effecting pressure engagement between a pair of nip roll members utilized for fixing toner images to copy substrates. The apparatus comprises a pneumatically displaceable diaphragm and load bar which cause pivoting of a pair of pivot arms which support one of the rolls for movement into and out of engagement with the other roll. A pair of compression springs inter-posed between the load bar and the pivot arms insure near constant loading notwithstanding air pressure fluc-tuations and/or roll dimension variations.
Apparatus for effecting pressure engagement between a pair of nip roll members utilized for fixing toner images to copy substrates. The apparatus comprises a pneumatically displaceable diaphragm and load bar which cause pivoting of a pair of pivot arms which support one of the rolls for movement into and out of engagement with the other roll. A pair of compression springs inter-posed between the load bar and the pivot arms insure near constant loading notwithstanding air pressure fluc-tuations and/or roll dimension variations.
Description
3~
--1~
PNEUMATIC/SPRING ACTUATION MEC~IANISM
FOR ROLL FUSER
BACKGROUND OF THE INVENTION
_____ The present invention relates to roll :Euser apparatus for fixing toner images to copy substrates and more particularly to mechanism for effecting pressure engagement between a pair of rolls forming the roll fuser.
In the process o xerography, a light image o~ an original to be copied is typically recorded in the form of a latent electrostatic image upon a photo-sensitive member with subsequent rendering of the latent image visible by the application of electroscopic marking particles, commonly referred to as toner. The visual toner image can be either fixed directly upon the photo-sensitive member or transferred rom the member t.o an-other support, such as a sheet of plain paper~ with sub-se~uent affixing of the image thereto in one oE various ways, for example, as by heat and pressure~
~n order to affix or fuse electroscopic toner material onto a support member by heat and pressure, it is necessary to elevate the temperature of the toner material to a point at which the constituents of the toner material coalesce and become tacky while simul-taneously applying pressure. This action causes the toner to flow to some extent into the fibers or pores of support members or otherwise upon the surfaces there-of. Therea~ter, as the toner material coolsr solidifica-tion of the toner material occurs causing the toner mater-ial to be bonded firmly to the support member. In both the xerographic as well as the electrographic recording arts, the use of thermal energy and pressure for fixing toner images onto a support member is old and well known~
One approach to heat and pressure fusing of .. ..
, , ., ,-- :
3~Z~
electroscopic toner images onto a support has been to pass the support with the toner images thereon between a pair of opposed roller members~ at least one of which is heated. During operation of a fusing system of this type~ the support member to which the toner images are electrostatically adhered is moved through the nip Eormed between the rolls with the toner image contacting the fuser roll thereby to effect heating of the toner images within the nip. Conventionally one or the other of the rolls is softer than the other so that where the rolls are forced into pressure engagement the softer roll is deformed thereby orminy a nip through which the support or copy substrates pass. Formation of the nip enables the toner images to contact the heated surface of the roll for a period of time sufficient to effect fusing~
In order to effect pressure engagement of the rolls a force applying mechanism is provided which usually takes the form of a cam and lever arrangement. In some instances the cam has been replaced by a pneumatic ac-tuator as for example, as in U. S. Patent 3,256,002.Such mechanisms yield satisfactory results, but re~uire complex and expensive pressure controls in order to main-tain a constant nip pressure, assuming the roll dimen-sions are exact.
Accordingly, it is the purpose of the present invention to incorporate in a heat and pressure roll fusing apparatusl pneumatically actuated mechanism for effecting pressure engagement of a pair of rolls which 30 mechanism is substantially insensitive to fluctuations in air pressure and which compensates for roll dimension variations in the same roll as well as between different rolls.
To this end, the mechanism contemplated com-35 prises a pair of pivot arms which are pivotally suppor-ted by a frame means forming a part of the xerographic :
.
.
machine in which the fuser is to be employed. The arms, in turn, support one of the rolls such that when the arms are pivoted in a predetermined direction the rolls are forced into pressure engagement. A pneumatically actuated diaphragm is operatively connected to the pivot arms via an elongated load bar and a compression spring interposed between each of the actuator arms and the load bar.
When air pressure ls applied to the diaphragm the displacement is transmitted first through the load bar then through the compression springs, then the ac-tuator arms and finally to the rolls.
Initial setting up o~ the mechanism requires pressurizing the diaphragm to 4.3 psi and adjusting a pair of stops which limit the travel of the load bar.
During operation, however, 6.0 psi are supplied so that normally expected downward fluctuation of air pressure will not affect the nip pressure, the maximum nip pressure being limited to 4.3 psi due to the position of the adjustable stops.
The mechanism disclosed dif~ers from that illus-trated in U. S. Patent 3,256,no~, in that, the structure disclosed in the pa~ent does not incorporate the compress-ion springs.
During the initial setup with air at 4.3 psi.
the air system compensates for the manufacturing tol-erances in the loading system resulting in the loading bar being not parallel to the roll axis. The loading bar is made to maintain this compensating po~ition by stop screws. After this setup any load change due to roll runouts and diametrical changes is minimized by the presence of compression springs which respond to those changes. A low k (load/deflection) value for the spring would ensure a small change in load.
.
~3~
-3a~
Thus, according to one aspect of this invention there is provided in a roll fuser apparatus for fixing toner images to a support material wherein a pair of rolls are orced into pressure engagement by a pneumatic actuator comprising an air displaceable diaphragm operatively coupled to a pair of pivot arm assemblies via a load bar displaceable by said diaphra~m, said pivot arm assemblies being operatively connected to the ends of one of said rolls and wherein adjustable stops are provided for the pressure that can be applied, whereby said one of the rolls is deformed by the other the improvement comprising:
constant load applying means interposed between said air displaceable diaghragm and said pivot arm assemblies and bias means for effecting separation of said rolls, when said pneumatic actuator is in operation.
According to another aspect of this invention there is provided a method of fusing toner images wherein a pair of rolls are provided one of which is mounted such that it can be moved into and out of pressure engagement with the other, by a pneumatic actuator for effecting such pressure engagement of said rolls, and including adjust-able stop means for limiting the degree of travel of said pneumatic actuator, wherein a predetermined pressure is applied to said pneumatic actuator for setting said adjust-able stops, the improvement comprising: providingconstant load applying means intermediate said pneumatic actuator and one of said rolls to which said actuator is operatively connected; applying a second predetermined pressure to said pneumatic actuator and passing copy sub-strates between said rolls to thereby fix toner imagescarried by said copy substrates thereto.
DESC_IPTION OF THE DRAWINGS
Fig. 1 is a side elevational view of a roll ;. ~
fuser apparatus including mechanism for effecting pres-sure engagement between the two rolls of the apparatus representing the invention.
Fig. 2 is a cross sectional view taken sn the line II-II of Fig. 1.
Fig. 3 is a top plan view of the apparat~s of Fig. 1.
Fig. 4A is a cross sectional view taken along lines IVA-IVA of Fig. 3.
Fig~ 4C is a view taken along the lines IVC-IVC of Fig. 3.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMEMT
As illustrated in Fig. 1, the fuser apparatus representing the invention is designated by the reEerence character 10.
The fuser apparatus comprises a heated Euser roll 12 comprising a relatively thick (i. e. 70 mils.) layer of conductive (i. e. 15 x 10 4 cal/cm. sec C.) silicone rubber 14 adhered to a cylinder 16 fabricated 23 from a thermally conductive ma~erial, for example, alum inum and haviny a wall thickness on the order of 0.375".
The fuser roll is preferably 15.75 in. long and has a nominal diameter of 30 inches~ A conventional type heat ; source 18 (Fig. 2) is stationarily supported within the hollow of the cylinder 16 and spaced equidistant from the internal surface thereof.` The capacity of the heat source is such that its output equals 1600 watts at 120 volts. The fuser roll is rotatahly journalled in a ma-chine frame 20, rotation thereof being effected by means of a drive arrangement 22 illustrated in Fig. 2~
As illustrated in Fig. 2, the drive arrangement 22 comprises a plurality of cylindrical gears 24, 26 and 28. As can be seen the gear 24 is attached to an end cap 30 forming a part of the fuser roll while the gears 26 and 28 are carried hy the machine frame 20.
Motive power to the drive arrangement is provided by 3~2~
a drive motor 32 (Fig. 2).
A pressure roll 34, as shown in Figs. 1 and 3 is supported for pressure engagement with the fuser roll 12 by means of a pair of pivot arm assemblies 36, 36' which are, in turn, pivotally supported by stub shafts 38 3~' carried by the machine frame 20. The pressure roll comprises a rigid core 40 having a r~la-tively thin 41 layer of PFA (a trademark oE E. I. du Pont) material adhered to the outer surface thereof, the PFA layer thickness being on the order of several mils. The pressure roll structure is thus harder than the fuser roll, therefore, when 300 pounds of pressure is applied between the rolls, as will be discussed here-inafte.r, the silicone rubber layer is deformed thereby providing a nip 42 on the order of 0.175 inch~ Tt should be appreciated that alternatively ~he user roll 12 could be supported by the pivot arm assemblies 36, 36'.
The ends of the arm assemblies 36, 36' remote from ends supportin~ the pressure roll are displaced during pressure enga~ement of the rolls by a pair of compression openings 44, 44' which encircle shoulder screws 46 (only one shown) and are thereby retained in their operative positions. The spring rate is on the order of 150#/IN. and the spring, free length is one inch, the springs being in a pre-compressed state to 0O84 inch of their free length. The opposite ends of the springs are operatively connected to an elongated load bar 48 which, in turn, is operatively connected to a diaphragm assembly 50 (Figs. 1 and 3).
The diaphragm assembly 50 (Figs. 4A, 4B, 4C) comprises an elastomeric member 52 overcoated with a nylon fabric which elastomer is attached to a rigid plate 54. The diaphragm is secured to a base 56 by means oE
a retaining ring 58, the base being supported by the machine frame 20.
An elbow 60 secured to the underside of the '' ' - : ., ~.
, .
3'~
base 56 and communicating with a bore 62 provided therein serves as means for introducing air under pressure to the diaphragm assembly to thereby displace the elastom-eric member 5~ which, in turn, causes displacement of the load bar 48, the displacement being transmitted to the springs 44, 44', then to the pivot arms assemblies resulting in loading of the pressure roll against the fuser roll.
The effective area of the elastomer 52 is 16 in.2 and a desired working pressure has been established as 4.3 psi. Conse~uently, in order to produce a total of 300 pounds of pressure between the rolls 12 and 34 the pivot arm assemblies 36, 36' are designed t:o produce a mechanical advantage of 4.32~
Roll load set-up is accomplished by applying a 4.3 psi. loading on the diaphragm and adjusting adjus-table stops 64 which are secured in the diaphragm support 56 (Fig. 3) and extend through apertures 65 (Fig. 4B) in the load bar 48 such that when adjustment has been made and the stops have been locked in place, the load corresponding to 4.3 psi. is maintained when the pressure is increased beyvnd 4.3 psi. During operakion of the fuser, a pressure of 6.0 psi. is applied to allow for downward fluctuations in the applied pressure without a corresponding decrease in load between the rolls.
As will be appreciated, the compression springs maintain a near constant load for roll dimension variations, either with the same roll or from roll to roll when a new roll is installed for a worn roll.
As viewed in Fig. 1, bias springs 66 are pro-vided for returning the pressure roll to a non-operative position ~i. e. rolls are out of contact). To this end, the bias springs are attached to the fuser frame and pivot arm assemblies 36, 36' r '`'~
;
.
;
' ~
' ' , ~' ~ ':,
--1~
PNEUMATIC/SPRING ACTUATION MEC~IANISM
FOR ROLL FUSER
BACKGROUND OF THE INVENTION
_____ The present invention relates to roll :Euser apparatus for fixing toner images to copy substrates and more particularly to mechanism for effecting pressure engagement between a pair of rolls forming the roll fuser.
In the process o xerography, a light image o~ an original to be copied is typically recorded in the form of a latent electrostatic image upon a photo-sensitive member with subsequent rendering of the latent image visible by the application of electroscopic marking particles, commonly referred to as toner. The visual toner image can be either fixed directly upon the photo-sensitive member or transferred rom the member t.o an-other support, such as a sheet of plain paper~ with sub-se~uent affixing of the image thereto in one oE various ways, for example, as by heat and pressure~
~n order to affix or fuse electroscopic toner material onto a support member by heat and pressure, it is necessary to elevate the temperature of the toner material to a point at which the constituents of the toner material coalesce and become tacky while simul-taneously applying pressure. This action causes the toner to flow to some extent into the fibers or pores of support members or otherwise upon the surfaces there-of. Therea~ter, as the toner material coolsr solidifica-tion of the toner material occurs causing the toner mater-ial to be bonded firmly to the support member. In both the xerographic as well as the electrographic recording arts, the use of thermal energy and pressure for fixing toner images onto a support member is old and well known~
One approach to heat and pressure fusing of .. ..
, , ., ,-- :
3~Z~
electroscopic toner images onto a support has been to pass the support with the toner images thereon between a pair of opposed roller members~ at least one of which is heated. During operation of a fusing system of this type~ the support member to which the toner images are electrostatically adhered is moved through the nip Eormed between the rolls with the toner image contacting the fuser roll thereby to effect heating of the toner images within the nip. Conventionally one or the other of the rolls is softer than the other so that where the rolls are forced into pressure engagement the softer roll is deformed thereby orminy a nip through which the support or copy substrates pass. Formation of the nip enables the toner images to contact the heated surface of the roll for a period of time sufficient to effect fusing~
In order to effect pressure engagement of the rolls a force applying mechanism is provided which usually takes the form of a cam and lever arrangement. In some instances the cam has been replaced by a pneumatic ac-tuator as for example, as in U. S. Patent 3,256,002.Such mechanisms yield satisfactory results, but re~uire complex and expensive pressure controls in order to main-tain a constant nip pressure, assuming the roll dimen-sions are exact.
Accordingly, it is the purpose of the present invention to incorporate in a heat and pressure roll fusing apparatusl pneumatically actuated mechanism for effecting pressure engagement of a pair of rolls which 30 mechanism is substantially insensitive to fluctuations in air pressure and which compensates for roll dimension variations in the same roll as well as between different rolls.
To this end, the mechanism contemplated com-35 prises a pair of pivot arms which are pivotally suppor-ted by a frame means forming a part of the xerographic :
.
.
machine in which the fuser is to be employed. The arms, in turn, support one of the rolls such that when the arms are pivoted in a predetermined direction the rolls are forced into pressure engagement. A pneumatically actuated diaphragm is operatively connected to the pivot arms via an elongated load bar and a compression spring interposed between each of the actuator arms and the load bar.
When air pressure ls applied to the diaphragm the displacement is transmitted first through the load bar then through the compression springs, then the ac-tuator arms and finally to the rolls.
Initial setting up o~ the mechanism requires pressurizing the diaphragm to 4.3 psi and adjusting a pair of stops which limit the travel of the load bar.
During operation, however, 6.0 psi are supplied so that normally expected downward fluctuation of air pressure will not affect the nip pressure, the maximum nip pressure being limited to 4.3 psi due to the position of the adjustable stops.
The mechanism disclosed dif~ers from that illus-trated in U. S. Patent 3,256,no~, in that, the structure disclosed in the pa~ent does not incorporate the compress-ion springs.
During the initial setup with air at 4.3 psi.
the air system compensates for the manufacturing tol-erances in the loading system resulting in the loading bar being not parallel to the roll axis. The loading bar is made to maintain this compensating po~ition by stop screws. After this setup any load change due to roll runouts and diametrical changes is minimized by the presence of compression springs which respond to those changes. A low k (load/deflection) value for the spring would ensure a small change in load.
.
~3~
-3a~
Thus, according to one aspect of this invention there is provided in a roll fuser apparatus for fixing toner images to a support material wherein a pair of rolls are orced into pressure engagement by a pneumatic actuator comprising an air displaceable diaphragm operatively coupled to a pair of pivot arm assemblies via a load bar displaceable by said diaphra~m, said pivot arm assemblies being operatively connected to the ends of one of said rolls and wherein adjustable stops are provided for the pressure that can be applied, whereby said one of the rolls is deformed by the other the improvement comprising:
constant load applying means interposed between said air displaceable diaghragm and said pivot arm assemblies and bias means for effecting separation of said rolls, when said pneumatic actuator is in operation.
According to another aspect of this invention there is provided a method of fusing toner images wherein a pair of rolls are provided one of which is mounted such that it can be moved into and out of pressure engagement with the other, by a pneumatic actuator for effecting such pressure engagement of said rolls, and including adjust-able stop means for limiting the degree of travel of said pneumatic actuator, wherein a predetermined pressure is applied to said pneumatic actuator for setting said adjust-able stops, the improvement comprising: providingconstant load applying means intermediate said pneumatic actuator and one of said rolls to which said actuator is operatively connected; applying a second predetermined pressure to said pneumatic actuator and passing copy sub-strates between said rolls to thereby fix toner imagescarried by said copy substrates thereto.
DESC_IPTION OF THE DRAWINGS
Fig. 1 is a side elevational view of a roll ;. ~
fuser apparatus including mechanism for effecting pres-sure engagement between the two rolls of the apparatus representing the invention.
Fig. 2 is a cross sectional view taken sn the line II-II of Fig. 1.
Fig. 3 is a top plan view of the apparat~s of Fig. 1.
Fig. 4A is a cross sectional view taken along lines IVA-IVA of Fig. 3.
Fig~ 4C is a view taken along the lines IVC-IVC of Fig. 3.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMEMT
As illustrated in Fig. 1, the fuser apparatus representing the invention is designated by the reEerence character 10.
The fuser apparatus comprises a heated Euser roll 12 comprising a relatively thick (i. e. 70 mils.) layer of conductive (i. e. 15 x 10 4 cal/cm. sec C.) silicone rubber 14 adhered to a cylinder 16 fabricated 23 from a thermally conductive ma~erial, for example, alum inum and haviny a wall thickness on the order of 0.375".
The fuser roll is preferably 15.75 in. long and has a nominal diameter of 30 inches~ A conventional type heat ; source 18 (Fig. 2) is stationarily supported within the hollow of the cylinder 16 and spaced equidistant from the internal surface thereof.` The capacity of the heat source is such that its output equals 1600 watts at 120 volts. The fuser roll is rotatahly journalled in a ma-chine frame 20, rotation thereof being effected by means of a drive arrangement 22 illustrated in Fig. 2~
As illustrated in Fig. 2, the drive arrangement 22 comprises a plurality of cylindrical gears 24, 26 and 28. As can be seen the gear 24 is attached to an end cap 30 forming a part of the fuser roll while the gears 26 and 28 are carried hy the machine frame 20.
Motive power to the drive arrangement is provided by 3~2~
a drive motor 32 (Fig. 2).
A pressure roll 34, as shown in Figs. 1 and 3 is supported for pressure engagement with the fuser roll 12 by means of a pair of pivot arm assemblies 36, 36' which are, in turn, pivotally supported by stub shafts 38 3~' carried by the machine frame 20. The pressure roll comprises a rigid core 40 having a r~la-tively thin 41 layer of PFA (a trademark oE E. I. du Pont) material adhered to the outer surface thereof, the PFA layer thickness being on the order of several mils. The pressure roll structure is thus harder than the fuser roll, therefore, when 300 pounds of pressure is applied between the rolls, as will be discussed here-inafte.r, the silicone rubber layer is deformed thereby providing a nip 42 on the order of 0.175 inch~ Tt should be appreciated that alternatively ~he user roll 12 could be supported by the pivot arm assemblies 36, 36'.
The ends of the arm assemblies 36, 36' remote from ends supportin~ the pressure roll are displaced during pressure enga~ement of the rolls by a pair of compression openings 44, 44' which encircle shoulder screws 46 (only one shown) and are thereby retained in their operative positions. The spring rate is on the order of 150#/IN. and the spring, free length is one inch, the springs being in a pre-compressed state to 0O84 inch of their free length. The opposite ends of the springs are operatively connected to an elongated load bar 48 which, in turn, is operatively connected to a diaphragm assembly 50 (Figs. 1 and 3).
The diaphragm assembly 50 (Figs. 4A, 4B, 4C) comprises an elastomeric member 52 overcoated with a nylon fabric which elastomer is attached to a rigid plate 54. The diaphragm is secured to a base 56 by means oE
a retaining ring 58, the base being supported by the machine frame 20.
An elbow 60 secured to the underside of the '' ' - : ., ~.
, .
3'~
base 56 and communicating with a bore 62 provided therein serves as means for introducing air under pressure to the diaphragm assembly to thereby displace the elastom-eric member 5~ which, in turn, causes displacement of the load bar 48, the displacement being transmitted to the springs 44, 44', then to the pivot arms assemblies resulting in loading of the pressure roll against the fuser roll.
The effective area of the elastomer 52 is 16 in.2 and a desired working pressure has been established as 4.3 psi. Conse~uently, in order to produce a total of 300 pounds of pressure between the rolls 12 and 34 the pivot arm assemblies 36, 36' are designed t:o produce a mechanical advantage of 4.32~
Roll load set-up is accomplished by applying a 4.3 psi. loading on the diaphragm and adjusting adjus-table stops 64 which are secured in the diaphragm support 56 (Fig. 3) and extend through apertures 65 (Fig. 4B) in the load bar 48 such that when adjustment has been made and the stops have been locked in place, the load corresponding to 4.3 psi. is maintained when the pressure is increased beyvnd 4.3 psi. During operakion of the fuser, a pressure of 6.0 psi. is applied to allow for downward fluctuations in the applied pressure without a corresponding decrease in load between the rolls.
As will be appreciated, the compression springs maintain a near constant load for roll dimension variations, either with the same roll or from roll to roll when a new roll is installed for a worn roll.
As viewed in Fig. 1, bias springs 66 are pro-vided for returning the pressure roll to a non-operative position ~i. e. rolls are out of contact). To this end, the bias springs are attached to the fuser frame and pivot arm assemblies 36, 36' r '`'~
;
.
;
' ~
' ' , ~' ~ ':,
Claims (4)
1. In a roll fuser apparatus for fixing toner images to a support material wherein a pair of rolls are forced into pressure engagement by a pneumatic ac-tuator comprising an air displaceable diaphragm oper-atively coupled to a pair of pivot arm assemblies via a load bar displaceable by said diaphragm, said pivot arm assemblies being operatively connected to the ends of one of said rolls and wherein adjustable stops are provided for the pressure that can be applied, whereby said one of the rolls is deformed by the other the im-provement comprising: constant load applying means interposed between said air displaceable diaphragm and said pivot arm assemblies and bias means for effecting separation of said rolls, when said pneumatic actuator is in operation.
2. Method of fusing toner images wherein a pair of rolls are provided one of which is mounted such that it can be moved into and out of pressure engage-ment with the other, by a pneumatic actuator for effec-ting such pressure engagement of said rolls, and including adjustable stop means for limiting the degree of travel of said pneumatic actuator, wherein a prede-termined pressure is applied to said pneumatic actua-tor for setting said adjustable stops, the improvement comprising:
providing constant load applying means inter-mediate said pneumatic actuator and one of said rolls to which said actuator is operatively connected;
applying a second predetermined pressure to said pneumatic actuator and passing copy substrates between said rolls to thereby fix toner images carried by said copy substrates thereto.
providing constant load applying means inter-mediate said pneumatic actuator and one of said rolls to which said actuator is operatively connected;
applying a second predetermined pressure to said pneumatic actuator and passing copy substrates between said rolls to thereby fix toner images carried by said copy substrates thereto.
3. Apparatus according to claim 1 wherein said constant load applying means comprises compression springs.
4. Apparatus according to claim 3 wherein said springs are pre-compressed.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US3409479A | 1979-04-27 | 1979-04-27 | |
| US034,094 | 1979-04-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1143429A true CA1143429A (en) | 1983-03-22 |
Family
ID=21874268
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000347989A Expired CA1143429A (en) | 1979-04-27 | 1980-03-19 | Pneumatic/spring actuation mechanism for roll fuser |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0018788A1 (en) |
| JP (1) | JPS55144274A (en) |
| CA (1) | CA1143429A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0544005A4 (en) * | 1991-06-17 | 1993-12-15 | Seiko Epson Corporation | Heat developing apparatus |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IL30229A (en) * | 1963-12-23 | 1968-12-26 | Rank Xerox Ltd | Contact heat fusing device |
| US3269626A (en) * | 1964-03-27 | 1966-08-30 | Omnitronics Inc | Adjustable support for pressure fixing rollers |
| JPS51145324A (en) * | 1975-06-10 | 1976-12-14 | Ricoh Co Ltd | Pressure regulating device for reproduction machine |
| EP0000632B1 (en) * | 1977-07-29 | 1981-06-17 | International Business Machines Corporation | Hot roll fuser for a xerographic copier |
-
1980
- 1980-03-19 CA CA000347989A patent/CA1143429A/en not_active Expired
- 1980-04-10 JP JP4745480A patent/JPS55144274A/en active Pending
- 1980-04-24 EP EP80301342A patent/EP0018788A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| EP0018788A1 (en) | 1980-11-12 |
| JPS55144274A (en) | 1980-11-11 |
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