DE2331205A1 - METHOD AND DEVICE FOR SUPPLYING MELTING OIL TO THE SURFACE OF THE SMELTING ROLLER OF A MELTING DEVICE, IN PARTICULAR FOR AN ELECTROSTATOGRAPHIC COPYING MACHINE - Google Patents

Description

'.r

HI 6723

RAM XEROX LIMITED

Rank Xerox House
338 Euston Road
London, NW1, England

Method and apparatus for supplying shredded oil to the surface of the melt roller a Schraela device, in particular for an electrostatographic copier

The invention relates to a method and a device for Feeding Schraelzöi onto the surface of a heated roller of a Sehmel device for an electrostatographic sheet Copy machine. The invention is particularly suitable for a melting device which has a heated melting roller and included a pinch roller

Sohmel devices are already in use in which an unheated pressure roller is printed against a heated melt roller to produce an image, for example an electrostatographically Formed powder image to be melted onto a sheet of paper while the sheet of paper is between the two rollers passes through. In order to avoid the powder particles sticking to the Schraelz roll and to loosen the paper from the

309 * 84/1334

- ρ -

To facilitate roll-, a melting oil is put on the melting roller applied «You choose a melting oil that suits the working conditions the melting device is chemically inert with regard to the chemical nature of the substances involved. Silicone oils are preferred as melting oils. With the used ones Melting devices, the melting oil is placed on the melting roller with the help of a lubricating wick soaked in oil applied, which is pressed against the melting roller .. In In a common method, the melt oil is fed into the lubricating wick using a melt oil tank Removal roller is rotatably arranged in such a way that at least its upper part protrudes from the oil. The pick roller is conveyed Oil to a transfer wick that is in contact with both the top of the pick roller and the lubricating wick is β

A supply system for the melting oil of the type described has several shortcomings. The tank of Schmelaöl must be from time to time be topped up from an oil bottle, with the risk of that oil splashed as it was poured into the tank it is difficult to obtain a precisely dosed supply of smelting oil as a coating on the shrink roller »The invention wants to create a melting device without this defect "

To achieve this, the invention provides a method for supplying melting oil to the surface of a heated roller of a melting device, in which, according to the invention, the oil is pumped directly from an oil supply to a wick in contact with the roller. The device according to the invention for carrying out the method has a wick in contact with a melt roller and a pump which pumps melt oil directly from an oil supply to the wick. The pump is preferably a peristaltic pump _{or the like}

Further features, details and advantages of the invention emerge from the following description of a guide

309884/1334

BAD ORfQJNAl.

Example based on the single drawing that shows a perspective Shows a view of the melter.

The illustration shows a heated one. Melting roller 151 »the im -. Frame of a copying machine, not shown, is rotatably mounted and has a quartz element 152 held in the axis. The fusible roller 151 is a hollow aluminum roller with a. Polytetrafluoroethylene-coating "The roller is biased in the axial direction by a spring 155 to one side of the machine so that it can expand when it is at operating temperature, \ lenn the roller when heated expands, the spring is compressed . When the fusing device is put into operation, the heated fusing roller 151 is rotated and a pressure roller 146 is pressed against the fusing roller 151. The axle 147 of the pinch roller is attached to a vertical rod 154 at each end. To raise the pressure roller, a horizontal bar 1 ^ 5, which carries the rods 154, is lifted from below. The pressure roller 146 is also driven (from a drive roller 136 of a horizontal transport of the copying machine) in order to avoid a slip between the two rollers of the melting device and the copy sheet passing between them.

The melting oil is raised with the help of a wick 157 made of felt applied to the surface of the Schraels roll. The wick is held in place by a part-cylindrical press plate 158 held on the upper circumference of the fuser roll. On the press plate 158 Pressure is applied to hold the wick 157 in place Maintain contact with the Schraelz roll. There is one for this Suspension 159 attached to the machine frame is provided. Two Pressure levers 160 exert a downward pressure on the pressure plate the end. The pressure planer 160 are attached to a rod 161 which, with the aid of each 162, clockwise as shown in the figure is preloaded »To inspect the wick 157 or replace it tojinen, a lifting planer 163 is provided, at dom the pressure levers 160 are raised against the force of the spring 162

3098847 13 34

8AP ORfOLNAt

2 831? Q5

The can. A peristaltic pump 164 »the one on the machine frame is held, the melt oil pumps directly to the wick 157. She squints the melting oil through two tubes 165 apart Openings 166 in the press plate 158. The peristaltic pump 164 is a slowly rotating, roughly triangular-shaped one Cams 167 open around the plastic pump tubing 168 between sets of rigidly mounted connection pieces 169 and 170 are stretched out. The rotation of the llookcns 167 exerts on the Pump tubing 168 generates a puinp force by moving the tubing 168 at the crests of the Iocking progressively koiapressedo accordingly is melt oil from a storage bottle 171 attached to the machine frame is held, sucked through supply hose 172 and, as described above, eject through tubes 165

The immediate pumping action according to the invention has the advantage that it enables the selective supply of melting oil to different parts of the Schnslarolle. In an alternate embodiment not shown, four tubes corresponding to tubes 165 are used to direct melt oil to four separate locations spaced along the melt roller. In this Pail it is possible to make such an arrangement that either only the two inner tubes are active or all four tubes are active. If only the two inner tubes are working, no melting oil is supplied to the outer parts of the welding roller in the event that the image-bearing copy sheet is less than the maximum available width of the melting roller used copy material avoided,

In order to block the supply of melt oil to the outer parts of the melt roller in a controlled manner, either a second peristaltic pump or a second squat, corresponding to the cam 167, which is driven via a coupling from the drive of the cam 167 ο In j ed era case will be the tubes for the exterior. RoI lent hurry ineffective gowach i by adding

309884/1334

BATH

the rotation of the second cam is stopped. This can by switching off the drive motor or by disengaging the clutch «

309884/1334

Claims (1)

2 3: '! ^? O 5 Pa t e η t η η. π ρ r ü g h e J Method £ uli supplying 3cbr; -elüöl on the surface of a healed shell of an ochiiielzeinriohtung, in particular for an electrontatographine copier, characterized in that there ;; : jehmeli; öX directly from an oil supply su one with ο he role in Ko2ita> .: t rising wick gopuiüpt v.ird _c Device:; ur exercise do: 3 process er-.ο according to claim 1, characterized by a - /. Vi rail; the roller (151) in contact with the wick (157) and cr ^ r-ch. e: ine Pur ρ a (164), which pumped smelting oil from a supply (1 '/' 1) in a direct manner su de: t iJocj ^ t (157) Device according to claim 2, characterized Key: _enn2eichnet} that the pump (164) is a peristn] tifiche Pur "po _o 4. Device NC cn claim 2 odor j5> characterized in that the high-speed oil can be fed to the wick (157) at at least two separate points (166) » Device according to claim 2 or 3? characterized, that the Schraelzöl the 7; ocht (157) controlled at one or more places can be supplied from a plurality of separate places isto Device according to one of Claims 2 to 5, characterized in that that the wick (157) is pressed against the roller (151) by a spring (159) 309884/1334