US3847479A - Cover for wire wrapped card chassis - Google Patents

Abstract

A control system for an electrostatic copying machine having different processing stations for uniformly charging, exposing, developing, transferring, fusing, cleaning, etc., during a copy cycle. The control system employs a wire wrapped card chassis as a basis thereof having a card chassis covered with numbered perforations therein in alignment with a number of pins on the card chassis as an aid to the service man for connecting test leads to various pins for diagnosing problems.

Description

[ Nov. 12, 1974 United States Patent [1 1 Helbig l l COVER FOR WIRE WRAPPED CARD cal Disclosure Bulletin, Vol. l3, N0. 8, H71.

CHASSIS Molded Probe Panels with Metal inserts, Lorenz et [75] lnventor: Gerald R. Helbig, Webster, NY.

21]., IBM Technical Disclosure Bulletin, Vol. 14, N0. 2, 7/71. 1

[73] Assignee: Xerox Corporation, Stamford,

Conn.

[ Filed Dec 5 1972 Primary ExaminerRichard M. Sheer [2i] Appl. No.1 312,400

ABSTRACT pying machine hu.lt .5 C t svmas omm m m mw wm w m mC OS embWa t de w v wdm e 0 m w m m m gpsnn r p.lga op n si. t f n wdas mm m wh sd e o i MID- Y m X na s fi ad fl m m fl m g 53 m w mm mmw n m fls mm mwmi Ahcdehflt ink P F MHX wim vp 5 D oo .111 3/5 /Mg 423D: m3 flnam ml h T. U." 5 .4 u n 5 m N m: 3 E mu M "1 RA u a y m, nu ma. .3 r 5 my in 21, u 3 n k A n m "U m kmo m" RSHSC n uh e H C R n M E2 2 n e 777 u s ww h Mei NH// 0 00 um d S Ld 580 .U .mm 006 34 l 844 U mum 6 U5 L 3 3 1 1 Claim, 3 Drawing Figures OTHER PUBLICATIONS Internal Scoping Aid, D. W. Beckinsale, IBM Techni- PAIENIEDHUHZ 1974 sum 1 of 3 3,8471479 PATENTEDHUV 12 I974 SHEEI 2 OF 3 BACKGROUND OF THE INVENTION In a reproduction machine, a number of machine operations must be accomplished in timed sequence relative to each other. For example, in a xerographic copier, the photoconductive surface is charged and the charged surface is exposed to produce a latent electrostatic image in conformity with the document being copied. The latent image is thereafter developed with a material such as a dry powder or toner. The developed image is subsequently transferred to a support material such as paper and the transferred powder image is then fused onto the paper to produce a permanent copy. Thus, in the operation of the machine, the photoconductor must be charged, the document must be fed into the machine, the transfer mechanism must be energized as the paper and the developed image simultaneously arrive thereat and the fusing mechanism must be energized as the paper passed therethrough. For high speed operation of these machines, it may be advantageous to employ an automatic document handler to place and remove original documents to be copied onto the exposure platen of the machine. It may also be desirable to. utilize a collater or sorter to accurately sort the copies made.

It can be seen that a multiplicity of machine operations and functions are necessary for the efficient reproduction of original documents on a xerographic machine. Controls to enable programming of the machine for the desired number of copies to be made, sorted originals to be fed, paper sensors to signify paper jams, logic devices to enable the machine to produce the programmed number of copies in the event a number of copies are lost because of machine malfunctions or jams, etc. require a fairly complex electrical system. In order to monitor and initiate all of the timed sequences and operations of the machine, the control circuitry may have hundreds of electrical connections. To simplify wiring of such a machine, a wire wrapped card chassis may be utilized. In the event of a malfunction in the machine, the service man may be required to connect jumper wires or diagnostic equipment to certain pins in the wire wrapped card chassis. Since the card chassis may contain hundreds of closely spaced pins, it is extremely difficult to determine the proper pin or connection required for the desired test procedure. Further, in connecting and disconnecting jumper wires or test equipment, it is very possible that the pins may be bent or broken by rough handling and contact adjacent pins, thereby causing a short in the system.

SUMMARY OF THE INVENTION This invention relates to an electrostatic reproduction machine employing an. electrical control system having a wire wrapped. card chassis. A card chassis cover havingnumbered perforations therein is provided to enable insertion of test leads into the desired numbered perforation for contacting the chassis pin in alignment therewith.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. I is an isometric view of a xerographic reproduction machine with the control console thereof tilted up for access thereto-- FIG. 2 is an schematic sectional view of a reproduction machine.

FIG. 3 is an enlarged isometric view, partially in section, illustrating the under side of the control console.

DESCRIPTION OF THE PREFERRED EMBODIMENT For a general understanding of an electrostatic processing system in which the invention may be incorporated, reference is had to FIG. 2 in which various components of a system are schematically illustrated. As in most electrostatic systems such as a xerographic machine, a light image of an original to be reproduced is projected onto the sensitized surface of a xerographic plate to form an electrostatic latent image thereon. Thereafter, the latent image is developed with an oppositely charged developing material comprising carrier beads and smaller powder particles triboelectrically adhering thereto to form a xerographic powder image corresponding to the latent image on the plate surface. The powder image is then electrostatically transferred to a support surface to which it may be fixed by a fusing device whereby the powder image is caused permanently to adhere to the support surface.

The electrostatically attractable developing material commonly used in electrostatic reproduction systems comprises a pigmentedtresinous powder hereinafter referred to as toner and carrier" of larger granular beads formed from a material removed in the triboelect-ric series from the toner so that a triboelectric charge is generated between the toner powder and the granular carrier. The carrier also provides mechanical control so that the toner can be readily handled and brought into contact with theexposed xerographic surface where the toner isattracted to the electrostatic latent image from the carrier to produce a visible powder image on the xerographic surface.

In the illustrated machine, an original D to be copied is placed upon a transparent support platen P fixedly arranged in an illumination assembly generally indicated by the reference numeral 10. While uponthe platen, an illumination system comprising two or more lamps and reflectors L are flash. energized to direct light rays upon the original to produce image rays corresponding to the informational areas on the original. The image rays .are projected by means of an optical system 11 to an exposure station A for exposing the photosensitive surface of a moving xerographic plate in the form of a flexible photoconductive belt 12. In moving in the direction indicated by the arrow, prior to reachingthe exposure station A, that portion of the belt being exposed would have been uniformly charged by a corona device 13 indicated at a belt run extending between belt supporting rollers 14 and. 15, the latter being the drive roller for the belt. The exposure station extends between the roller 14and a third support roller 16. The belt run between these rollers is encompassed entirely by the exposure station-for minimizing the space required by the belt andits supporting rollers.

The exposureof the belt to the light image discharges the photoconductive layer in the areas struck by light whereby there remains on the belt a latent electrostatic image in image configuration corresponding to the light image projected from the originaldocument. As the belt surface continues its movement, the electrostatic image passes around the roller 16 to a developer station .7 by the reference numberal .17. The developer apparatus 17 comprises aplurality of brushes which carry developer to the adjacent surface of the upwardly moving inclined photoconductive belt 12 to provide development of the electrostatic image.

The developed electrostatic image is'transported by the belt 12 to a transfer station C located at a point of tangency on the belt around the drive roller 15 whereat a sheet of copy paper is moved at a speed in synchronism with the moving belt in order to accomplish transfer of a properly registered developed image.

tus comprising a main paper feed supply and an auxiliary paper feed supply 21. Each of the paper supplies is adapted to separate sheets from their respective supply stacks and to transport the sheets to a sheet registration station and eventually into contact with the developed image on the belt as the same is carried around the drive roller 15. A suitable timing control mechanism is operatively associated with each of the paper supply mechanisms 20, 21 and the flash illumination device L, for producing an electrostaticlatent image on the belt 12 to present a developed image at the transfer station C in timed sequence with the arrival of a sheet of paper, and is coordinated with the activation of other processing and control devices at the precise time that these elements are to function for their intended purpose. I

After the developed image-is transferred toa sheet of paper, it is stripped from thebelt 12 and conveyed by conveying system 23 into a fuser apparatus generally indicated by reference numeral 24 wherein the developed and transferred xerographic powder image on the sheet material is affixed thereto. After fusing, the finished copy is discharged from the apparatus by a conveyer 25 at a suitable point for collection externally of the apparatus. The toner particles remaining as residue on the developed image and those particles not otherwise transferred are carried by the belt 12 to a cleaning apparatus 26 positioned on the run of the belt between the-rollers 14 and 15 adjacent the charging device 13. The cleaning apparatus comprises a discharge device 27 for neutralizing charges remaining on the particles and a rotating brush 28 which operates in conjunction with a vacuum system to remove the residual toner particles from the brush.

' Referring now to FIGS. 1 and 3, the xerographic machine is provided with a control console 40 which is adapted for rotation aboutian axis in the upper rear corner thereof to provide access to the wire wrapped card chassis 41 which forms a basis for the electrical control system of the machine. Since the card chassis contains hundreds of pins, 42, a great number of which would not require access for machine diagnostic purposes, a cover 44 is provided having a plurality num-' bered perforations 46 therein, the perforations being in alignment with pins on the wire wrapped card chassis which may be necessary or desirable for connection of test leads 48 thereto to determine the cause of various machine malfunctions. The inside surface of the cover is spaced from the ends of thecard chassis pins. in order to connect a test lead to the desired pin beneath the numbered perforation in the cover, the service man must insert the test lead or test probe directly into the perforation perpendicular to the surface of the-cover. The perforation are sized relative to the size of the test leads to prevent insertion of the leads other than perpendicular to the surface of the card cover. In this way, it is very difficult to bend the pins on the card chassis or to contact adjacent pins with the test lead and cause a possible short. It can be seen from the foregoing that a numbered or labeled perforated wire wrapped card chassis cover greatly simplifiesmachine servicing and minimizes possible damage to the pins in the chassis.

While I have describeda preferred embodiment of my invention it is to be understood that the invention is not limited thereto but maybe otherwise embodied within the scope of the following claims.

What is claimed is: I 1. An electrostatic reproduction machine for producing copies of an original having a moving photoreceptor and a plurality of processing devices arranged when activated for producing electrostatic latent images on the photoreceptor for developing the images and for transferring developed images to a moving support material;

a control system for monitoring machine operations and energizing various machine elements in timed relation relative to-the movement of the photoreceptor, said control system including a wire wrapped card chassis having a plurality of upstanding pins thereon, card chassis cover adapted to prevent access to a number of said pins','said cover having a plurality of numbered perforations'therein' in alignment with selected pins in said wire wrapped card chassis, said perforations being adapted to receive and guide test leads therethrough into engagement with the pins disposed behind said cover in alignment with said perforations for checking proper operation of said reproduction machine while preventing contact between the test leads and adjacent pins andpreventing damage to the pins in alignment with said perforations.

Claims (1)

1. An electrostatic reproduction machine for producing copies of an original having a moving photoreceptor and a plurality of processing devices arranged when activated for producing electrostatic latent images on the photoreceptor for developing the images and for transferring developed images to a moving support material; a control system for monitoring machine operations and energizing various machine elements in timed relation relative to the movement of the photoreceptor, said control system including a wire wrapped card chassis having a plurality of upstanding pins thereon, a card chassis cover adapted to prevent access to a number of said pins, said cover having a plurality of numbered perforations therein in alignment with selected pins in said wire wrapped card chassis, said perforations being adapted to receive and guide test leads therethrough into engagement with the pins disposed behind said cover in alignment with said perforations for checking proper operation of said reproduction machine while preventing contact between the test leads and adjacent pins and preventing damage to the pins in alignment with said perforations.

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