US3909128A

US3909128A - Control logic for changing a multi-mode copier/duplicator from one mode to another

Info

Publication number: US3909128A
Application number: US528161A
Authority: US
Inventors: Lawrence R Sohm
Original assignee: Xerox Corp
Current assignee: Xerox Corp
Priority date: 1973-08-31
Filing date: 1974-11-29
Publication date: 1975-09-30
Anticipated expiration: 1992-09-30

Abstract

In a multi-mode automatic copier/duplicator designed to make copies of different sizes in different modes, a control apparatus is provided for completing a mode change automatically once the mode change is initiated by an operator and conditioning the machine to be ready to operate in the mode to which it is changed.

Description

United States Patent 1191 Sohm 14 1 Sept. 30, 1975 CONTROL LOGIC FOR CHANGING A MULTI-MODE COPIER/DUPLICATOR FROM ONE MODE TO ANOTHER [75] Inventor: Lawrence R. Sohm, Fairport, NY.

[73] Assignee: Xerox Corporation, Stamford,

I Conn,

[22] Filed: Nov. 29, 1974 [2]] Appl. N0.: 528,161

Related U.S. Application Data [63] Continuation of Ser. No. 393,544, Aug. 31, 1973,

abandoned.

[52] US. Cl. 355/8; 355/14; 355/49 [51} Int. Cl. 603G 15/22 [58] Field of Search '355/3 R, 8, 11, 14, 47-51 [56] References Cited UNITED STATES PATENTS- 3,450.995 6/1969 Hirsch 355/14 UX 3,480,360 11/1969 ,Mallory et al. 355/8 3,589,808 6/1971 Del Vecchio 355/3 R 3,652,157 3/1972 Blackert et al. 355/49 3,677,635 7 1972 Van Auken et a1. 355/51 x 3,689,143 9/1972 Case et al. 355/3 R 3,740,132 6/1973 Komori et a1... 355/3 R 3,833,296 9/1974 Vola et al. 355/51 FOREIGN PATENTS OR APPLICATIONS 2,250,664 4/1973 Gemiany 355/8 OTHER PUBLICATIONS Hoskins et ali, Dual Mode Copying System, IBM Technical Disclosure Bulletin, June 1969, p. 173.

Primary Examiner-Samuel S. Matthews Assistant Examiner-Kenneth C. Hutchison [5 7] ABSTRACT In a multi-mode automatic copier/duplicator designed to make copies of different sizes in different modes, :1 control apparatus is provided for completing a mode change automatically once the mode change is initiated by an operator and conditioning the machine to be ready to operate in the mode to which it is changed. 1

14 Claims, 16 Drawing Figures US. Patent Sept. 30,1975

Sheet 2 of 15 U.S. Pateznt Sept. 30,1975 Sheet30f 15 3,909,128

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U.S. Patent Sept. 30,1975 Sheet70f 15 3,909,128

EXPOSURE US. Patent Sept. 30,1975 Sheet80fl5 3,909,128

US. Patent Sept. 30,1975 Sheet 10 of 15 3,909,128

U.S. Patent SCpt. 30,1975 Sheet 12 of 15 3,909,128

F/G [3 MODE CHANGE END OF PLACE LDC INITIAL LEVER CTR RuN IN LDC POSITION l COUNTER 2\ SCAN 2333",? SOLENOID PLATEN 20 I3 I /2\ HOME sCAN MASTER GEARS To SWITCH SOLENOID CTR HELD LDC DRIVE DEACTIvATED DEENERGIZED CLEAR ENGAGED l CAIGRJrIII'GEE PAwI 4\ LDC MODE END OF PREVENTS swITCH S6 sCAN FLYBACK OPENED END 0F 5\\ mm sw MOMENTARY s2 swITCH s5 CLOSED oPERATEs I PAPER FEED l3 INHIBIT 6-\ VOLTAGE SOLENOID (+5v. DC) RELEASED PowER SUPPLY CTR START ENERGIzED "WAIT" LATCHED LIGHT OFF L D C "WAIT" //9 No Do I oGIC COMES CYCLE OUT INITIALIZED ON PAPER FEED SOLENOID INHIBITED US. Patent Sept. 30,1975 Sheet 15 0f15 3,909,128

LIGHT ome. 54T DEV. BIAS LATCH Y PRINT I [23 M CONTROL LOGIC FOR CHANGING A MULTI-MODE COPlER/DUPLICATOR FROM ONE MODE TO ANOTHER FIELD OF THE INVENTION This is a continuation of application Ser. No. 393,544 filed Aug. 31, 1973, now abandoned.

This invention relates to a copier/duplicator machine designed to operate in different modes and more particularly, to a control apparatus which enables the machine to change from one mode to another automatically once mode change is started.

BACKGROUND OF THE INVENTION Use of control circuitry for generating signals necessary to operate various devices or control elements in a machine is generally known. For example, xerographic copier/duplicator machines based on Chester Carlsons invention in the electrostagographic copying principles usually includes control means for implementing various steps involved in making xerographic copies; for example, means for charging a photosensitive insulating layer, imagewise exposing the layer, developing the image with toner, transferring the image on a sheet of paper, removing the sheet, heat fusing the transferred image on the sheet, and cleaning the layer for subsequent use, etc. The means for achieving these steps include certain controlled elements for implementing the various xerographic processing steps; for example, means responsive to a signal for actuating the main drive motor of the machine, common generating means for charging the photosensitive insulating layer or transferring the image on the layer onto the transfer sheet or copy paper, magnetic brush developer means, means for cleaning the layer, scanner carriage and optical scanning means for projecting the image of the original onto the photosensitive insulating layer, jam detection means, etc. The machine is usually provided with a suitable control logic circuitry for generating appropriate signals required to actuate or energize. the various controlled elements in a timed sequence so that the xerographic steps are properly implemented.

Heretofore, generally the copier/duplicator was designed to operate in a single mode in making copies of the original. For example, the typical machine was designed so that its optical scanning arrangement moved past an original in a stationary position, or in the alternative, the scanning arrangement was held in a fixed or a stationary position while the document original was fed past the scanning arrangement in making copies up to a certain size. Such machines had an inherent limitation, in that, for example, they were capable of making copies only up to a certain given size, such as legal size paper (8 /2 inches X 14 inches), but not capable of making copies on a sheet which is larger than this given size.

More recently, however, there has developed a copier/duplicator machine which is capable of operating in more than one mode of operation for making copies of different sizes. An example of such a machine is described in detail in the copending case, U.S. application Ser. No. 284,687, filed on Aug. 29, 1972, now abandoned and replaced by continuation application Ser. No. 367,996, filed on June 7, 1973, both applications being assigned to the same assignee as the present invention. As described in the application, the machine is designed so that in a first or base mode of operation a moving optical scanning means is used in scanning a stationary original and in a second or LDC mode of operation the scanning arrangement is stationary and the document original is moved past a scanning station by a document feeding means. The machine is designed so that, in the base mode, it can make copies in normal letter size, (e.g., 8 /2 inches X l 1 inches) and up to legal size (e.g., 8 /2X 14 inches) and in the LDC mode or Large Document Copy mode, copies up to 14 inches X 18 inches can be made.

SUMMARY OF THE INVENTION It is an object of the present invention to provide control apparatus for enabling the machine to complete a mode changing operation automatically once a mode change is initiated.

It is another object of the present invention to provide improved control apparatus for completing a mode change in a copier/duplicator machine capable of making copies of different sizes in different modes from the document originals of different sizes in a selective manner.

The foregoing and other objects of the present invention are achieved according to the present invention by providing a control apparatus which completes the mode change once the operator initiates the mode change.

It is another feature of the present invention to provide control apparatus for generating signals necessary to control and complete a mode changing operation.

It is still another feature of the present invention to provide control apparatus having means for sensing that a machine is in the base mode, means for sensing that a document original feed means has been moved to an engaged position to be ready to feed a document original and means responsive to the movement of the document original feeding means to an engaged position for completing a mode change from the first or base mode to the second or LDC mode.

It is-a further feature of the present invention to provide control apparatus for retaining scanning means at the end of a scan position when the mode of operation is changed from the base mode LDC mode.

The foregoing and other objects and features of the present invention will be made clearer from the following detailed description of an illustrative embodiment of the present invention in conjunction with the accompanying drawings, in which:

FIG. 1 shows a frontal schematic view of a copier/duplicator in which control circuitry according to the present invention may be utilized.

FIG. 2 shows a schematic top view of an auxiliary document original feeder that may be used as an accessory to the base machine when the machine is operated in the auxiliary or LDC mode.

FIG. 3 shows a perspective schematic view of the machine that shows certain switches and operator controlled elements involved in the mode changing operation of the machine.

FIG. 4 shows a functional block diagram of the control apparatus of the present invention.

FIG. 5 shows a functional block diagram of base logic that may be used for the base mode of operation of the control apparatus.

FIG. 6 11 when combined in the form of FIG. 12, show the auxiliary control circuit in detail.

FIG. 13 shows an operational flow chart helpful in describing and understanding the operation of the condescribing and understanding the operation of the control apparatus.

FIG. 16 shows a portion of the logic redrawn to show the interrelationship of the LIGHT ORIGINAL and PRINT button on the LDC logic.

bEsckrprroN OF THE, ILLUSTRATIVE/ EMBODIMENT OF. THE PRESENT INVENTION The control circuitry of the present invention will be described in the context xerographic copier/duplicator machine of a specific design. However, it should be noted from the outset that although the description is in the context of the xerogrpahic machine, the scope of the present invention is not limited to the xerographic machine. Clearly as will be evident from the following description,-the principles of the present invention can be applied to other types of machines having similar operational requirements. Now referring to the drawings, as shown in FIG. 1, a xerographic copier/duplicator machine typically includes various elements for implementing xerographic steps. It comprises a drum that may be driven clockwise about an axis 11. The drum includes a photosensitive insulating layer surface 12 around the periphery of which various controlled elements are situated; namely, charging means A, imagewise exposing means B, developing means C, image transfer D, cleaning means E, and fusing means F, etc., for effecting the usual steps involved in making xerographic copies. The machine may be further provided with a suitable feeding means PF for feeding copy sheets of paper from a paper supply in a cassette 15 and a suitable paper transfer means 17 for transferring the imaged paper onto the fusing station F where the toner image is fused onto the paper and then paper feed out to a suitable receptacle means 19.

As described in the copending application Ser. No. 367,996 mentioned above, a subject xerographic copier/duplicator machine may be designed to operate in different modes. In a first, or base mode, conventional sized documents up to a certain size are copied and in a second or LDC mode larger sized documents are processed. For example, in the base mode, the machine is designed to employ a moving optical scanning arrangement 21 24 to scan a stationary original placed on a platen 20 in making copies up to 14 inches in length and 8.5 inches in width. In the LDC mode, it is designed so that the scanning arrangement is held at a stationary position and the document original is moved past a scanning station SS.

Referring to FIGS. 1 3, in base mode operation, the scanning arrangement 21 is moved across the width of the platen 20 by a carriage (not shown) so that the associated optical means 22 25 projects the image of the original on the xerographic drum surface 12 at the image exposing station B. In base mode operation, the machine is designed so that, in each copy run after the initial warm-up period, each successive xerographic copying cycle is accomplished in the same given time interval. The cycle time starts as thescanning means leavesthe home position near the scan start sensing switch S1 and continues to move past the platen and ends as it reaches the end of scan position at the scan end sensing switch S2. The next cycle begins as the scanning means automatically flies back to the home position.

In the LDC mode of operation, a large document original is fed through a feeding means 20 such as that shown in a pending U.S. application Ser. No. 205,911 filed on Dec. 8, 1971 or in U.S. Pat. No. 3,731,915 issued to Guentner. For example, as shown in the forementioned copending application Ser. No. 284,687, the document feeding means 30 may be stationed outside of the platen 20 and be in a disengaged position when the machine is to operate in the base mode as shown in dotted lines (FIG. 1). It includes a lever 31 which'is designed so that by moving it clockwise the feeding means 30 is brought into or engaged into a position as shown in solid lines so that it can feed documents for the LDC Mode. Thus, in this position, the document original can be fed past the scanning station SS. A suitable mechanism 33 is provided in the machine for coupling feed rollers 34 to the main drive M when the document feeding means 30 is moved to the LDC position. Once engaged, the rollers 34 driven by the main drive M feeds the document original to the left past the scanning station SS. The speed with which the paper is fed past the scanning station SS is synchronized with the speed with which the copy paper 36 from the paper cassette 15 is fed into a transfer relationship with the photosensitive insulating layer 12 by a suitable paper feeding means PF. When it is desired to operate the machine in the base mode, the document feeding means is simply moved out of the way of the platen by rotating the lever 31 in a counterclockwise direction. The counter clockwise rotation of the lever 31 moves the document feeding means 30 to the right shown in dotted lines and out of the path of the scanning station SS. At the same time, the driving mechanism 33 disengages the feed rollers 34 from the main drive M to render the document feeding means inoperative. While inthe illustrative embodiment, it is shown that the document original feeding means is moved from one position to another to engage or disengage the machine in the LDC Mode, it need not be so limited. For example, the document feeding means could be held at a fixed stationary position using suitable actuating means such as a push button to engage or disengage document feed rollers and thus selectively engage the feeding means for the LDC mode.

In the base mode, control circuitry of conventional design may be used to provide signals necessary for the selective enabling of certain elements such as charging, exposing, developing, image transferring, fusing and cleaning means that implement the steps necessary in making a copy. The circuitry may comprise electromechanical or electronic components such as that shown in the U.S. Pat. No. 3,301,126, as issued to R.F. Osborne et al, on Jan. 31, 1967, or that shown in application ser. No. 348,828, filed on Apr. 6, 1973. now U.S. Pat. No. 3,813,157, which acts to implement various xerographic process steps at appropriately timed intervals at various points in the processing operation under conditions where necessary timing is derived from a clock or cam mechanism or other suitable means. Generally, as described in the above mentioned copending application Ser. No. 367,996 for base mode operations,

the timing of the xerographic copying cycle is keyed to the scanning operation of the scanning means. Thus, in the base mode, each cycle of xerographic processing steps during the making of successive copies in a .copy run is keyed to the start and end of the scanning operation involving the movement of the scanning carriage between the home position (at switch S1 in FIG.1 or 3) and the end of scan position (at switch S2 in FIG. 1 or 3).

. In addition, the control circuitry is also providedwith a suitable design such as that'shown in US. Pat. No. 3,588,472, as issued to Thomas H. Glaster et al. on June 28, 1971, or in US Pat. Ser. No..344,322, filed on Mar. 23', 1973, now US. Pat. No. 3,832,065, for detecting various malfunctions of the machine. For example, referring to FIGS. 1 and 3, the machine may include detack detecting means 37 for detecting the failure of copy paper separation from the drum surface 12, jam detection means 38 for detecting a paper jam that may occur along the paper path, and heat sensing element 39 for monitoring the temperature of the fusing station F. The outputs of these detecting means form a part of the input signal to the control circuitry of the present system.

In the present machine, various sensing elements in the form of switches are used to provide certain necessary input signals to the control circuitry. These switches are shown schematically in FIGS. 2 and 3, and, briefly stated, they provide the following functions:

S1 switch S1 is used for providing a signal indicative of the fact that the scanning element 21 is at the home or start position of the scan cycle. This will be referred to, in the alternative, as a home switch, It is designed so that it is actuated when the scanning element 21 is at the home position. In the actuated condition it is closed and provides ground or a logic 0 signal.

S2 switch S2 is used to sense the positioning of the end scan position as shown in FIGS. 1 and 3. This switch will be referred, in the alternative, as the end of scan switch. It is normally open but it is actuated to close when the scanning element 21 reaches the end of the scan position. When actuated it provides ground and a lo'gical'O signal.

S3 switch S3 (FIG. 3) is utilizedto detect the trailing edge of a copy paper sheet. It 'is normally closed. Upon detection of the trailing edge, it opens and provides a logical 1 signal.

54 switch S4 is utilized to sense the presence of a large size paper or LDC paper cassette in the paper tray. It is normally open. But it closes in the presence of a LDC paper cassette.

S5 switch S5 is positioned to sense the movement of the document feeding means 30 into the LDC mode position. It is normally in the open state. It is a a momentary switch that actuates or closes momentarily as the document feeding means 30 moves into the operative position for the LDC mode of operation. It is designedso that it initializes the control circuitry. S5 is connected so that when actuated, it momentarily provides +18 volts DC to a +5 volt D.C. regulator and triggers it into operation, thereby supplying the necessary +5 volts DC to initialize or start various circuit elements of the control circuitry. (FIG. 4). The momentary switch S5 may be a one way rollover type switch that actuates in a first direction when the'machine goes from the base mode to the LDC mode but not in the opposite direction. Switch S5 will be referred to as the mode change switch alternatively.

S6 switch S6 is a step-wise switch-which is actuated to an open condition as the document feeding means 30 moves to the LDC mode position from base mode position. It is normally closed. Upon actuation to an open condition, it provides a logical 1 signal to the logic circuit. The logic 1 signal from this switch is utilized 'by the LDC control circuitry as an indication of the change in the mode of operation of the machine from the base mode to the LDC mode and of the operation of the machine in the LDC mode. This switch will be'alternatively referred to as LDC mode switch.

S7 and S8 these two switches are utilized to'sense leading'and trailing edges of the document original being fed into the documentfeeding means 30. The

switches are normally closed and they are connected in series but they open in -the'presence of the document original to signify its presence. They are positioned in the path of the document original so that at least one or the other will sense the presence of a paper of even a narrow width. Operation of either or both is utilized to signify the presence of the document original, the leading and trailing edges of the document original.

Briefly stated, the switches S1 S8 above are connected to operate and provide'the following functions.

The home switch S1 when actuated shows that the scan carriage is at'the home position. The end of scan switch S2 is a non-actuated condition at this point. Now suppose the operator wishes to operate the machine in an LDC or large document copy mode. The lever arm 31 is moved clockwise to place the document feeding means 30 to the left and thereby place the machine in the large document copying mode. As the lever arm 31 is rotated, the LDC mode switch S6 is actuated and then the switch S5 is momentarily actuated. This initializesthe control circuitry for the LDC mode of operation.

In response to such'initializing, the control circuitry causes the scanning arrangement and associated optics to move into the LDC position, that is, to the end of the scan position associated with switch S2. Furthermore, the control logic associated with LDC mode of operation is so designed that the action of copy paper feed solenoid II in selectively feeding copy paper is prevented or inhibited 'while the scanning arrangement and the optics 21 25 move to the end of the scan position. The arrival of the scanning elements at the end of the scan position is sensed by the end of scan switch S2. Upon a detection of this condition by switch S2 the scanning and optic elements are retained in the end of scan position by the enabling of a suitable pawl and ratchet mechanism. For a detailed discussion of an exemplary mechanism of this type, one may refer to the copending application Ser. No. 284,687. This prevents the scan carriage means from automatically returning to the home switch position as done in base mode operations and when the scanningmeans reaches the end of scan positiongthe main drive M drives the document original feed rollers 34.

In response to the end of scan signal, the control circuitry removes the constraints on the operation of the solenoid II to allow the copy paper feeding means PF to selectively operate. With the solenoid enabled, the drive belt means 41' and 42 are prevented from engaging with the main drive M and no copy paper is fed. When solenoid II is de-actuated the controllogic, in response to actuation of the LDC document original sensing means S7 and S8 as the document original passes thereby causes engagement of the drive belt means, and the main drive M is allowed to drive the copy paper feed rollers 44 in synchronism. with the speed with which the document original is fed past the scanning station SS. The switches S7 and S8 actuate as the document original paper is fed therepast in the paper feeding means 30 and enables the control logic to proceed with LDC mode of copying operation. Absent any malfunction, the machine proceeds to complete the copying operation.

In the shut down phase of the LDC mode of operation, somewhat different steps are involved, as shall be more fully explained, depending upon whether the trailing edge sensing switch S3 of the copy paper is sensed before or after the trailing edge of the document original is sensed by the document original sensing switches S7 and S8.

There are a number of indicating means that may be provided in the copier/duplicator machine, as shown in FIG. 3, to provide the following functions: WAIT This is visual indication means 50. It is connected in a manner to provide the Wait indicia when the document feeding means 40 is moved to the LDC position, and this condition is maintained by the control circuitry until the scanning element 21 moves to the end of the scan position and the machine is ready to make copies. The lighted indicating means 50 comes to the view of the operator during this time and alerts the operator to wait until the indication terminates before the document original sheet is fed through the feeding means 30. The indicating means 50 may include a suitable notation WAIT for the operators convenience. Preferably, the indicating means 50 may be positioned above the console of the base machine as shown in FIG. 3 at a position where it will be hidden by the housing of the paper feeding means 30 when the same is positioned for base mode operation.

ADD-PAPER An indicating means 51 Add Paper is provided to apprise an operator that attention to the paper supply is necessary. It may be so connected that it is energized by the control circuitry when the paper supply runs out or when the incorrect size paper supply is present.

CLEAR PAPER PATH The indicating means 52 is provided to signify to the operator that a paper jam condition is present and requires clearing.

In addition, certain push buttons are provided in the machine for inputting certain command signals to the control circuitry. For example:

PRINT This input, button 53, is used to enable the operator to start the machine in the base mode or in the alternative in the LDC mode if the machine is already in the LDC mode.

LIGHT ORIGINAL This input, button 54, serves the function of starting an appropriate machine cycle when the original has poor background quality and the operator wishes to remove the background and obtain a copy with a clearer background. If the machine is in the base mode, it may be placed in the LDC mode by moving the lever arm clockwise; movement of the lever is accomplished by the operation of the momentary switch S5 and LDC mode switch S6 to provide the print command signal. However, if the machine is already in the LDC mode then a depression of either the PRINT I button 53 or LIGHT ORIGINAL buttom 54 provides theprint command signal. a

STOP The STOP input, button 55, is used for stopping the machine in the middle of its operation and causes the control circuitry to stop the machine at the end of the copying cycle in process.

The logic of the present control circuitry is configured so that when operated in the LDC mode, the machine operates in a single cycle or copy mode, wherein one copy of a document original is made at a time. The copy cycle in an LDC mode is such that a copying cycle is started when the machine is placed in the LDC mode, the copy is formed and completed and thereafter a shutdown mode is initiated after a given delay. In each copy cycle in the present embodiment, a copy of up to a given size, for example, 14 inches in length and 18 inches in width, is made. If the orginal is wider than 18 inches, then a succeeding cycle of the copying process may be employed tocomplete the copying of the remainder of the orginal on a succeeding copy sheet.

Because of the flexibility and versatility built into the logic of the control circuitry, the operation of the machine need not, however, be limited to that specifically set forth for the base and LDC modes of operation described above. For instance, the machine can be run so that in theLDC mode, the machine may be employed as a single copy machine for small size copies ranging up to 8.5 inches in width and 14 inches in length in size, although this mode is primarily designed to make large sized copy. The machine can also be run as a multicopy system in the LDC mode by provided a suitable means RDF (FIG. 1) designed to refeed a document originalcoming out of the document feeding means 30 back to input thereof before the machine is shut down by the control logic.

The general functions of the control circuitry according to the instant invention are described with reference to the block diagram of FIG. 4. The control circuitry according to the present invention generally includes input means for applying various command or input-signals to the control logic which are required to operate the machine either in a base mode or LDC mode. Another input means 61 is provided for applying other required command or input signals to the control circuitry when the machine is operated in the LDC mode. The control circuitry is also provided with base logic 62, LDC logic 63, and a buffer 64 for. selectively conveying output control signals from the base and LDC logic for operating the controlled elements of the xerographic machine.

The input signals provided from input means 60 to the base logic 62 include the manual command inputs 1 such as provided by the PRINT, LIGHT ORIGINAL,

and STOP buttons, as well as sensor inputs such as provided by the home position scan switch S1, the copy paper edge sensing switch S3, the failure condition detection means FD which includes the jam detecting means, the detackdetecting means, the means for sensing an over heating of the fuser, etc., and machine interlock INTLK switch 63 which may be used to switch in or out on AC power source. These inputs are applied from the input means 60 to the base logic 62 via suitable paths 64. The input signals provided from the input means 61 to the LDC logic 63 include input sig-

Claims

1. A control apparatus in an automatic reproducing machine having scanning means for scanning a stationary document original and document original feeding means for feeding a document original past said scanning means while said scanning means is held stationary, said machine being designed to operate in a first mode wherein said scanning means is moved for scanning said stationary document original, and in a second mode wherein said document original feeding means is positioned in an engaged position for feeding a document original past said scanning means while it is held in said stationary position, comprising: mode change starting means including means for moving said document original feeding means from a disengaged position to said engaged position, control circuitry including means responsive to the movement of said document original feeding means to said engaged position from said disengaged position for completing said mode change operation by conditioning said machine so that said scanning means is held in said stationary position, a plurality of reproducing step implementing means, means to set said machine in said first or said second mode, first means responsive to the setting of the machine in said first mode and responsive to the starting operation for generating a plurality of process step implementing signals, means for applying said process step implementing means for effecting the reproducing steps in said first mode of operation, and Second means responsive to the setting of the machine in said second mode and responsive to the starting operation for generating a plurality of process step implementing signals and applying said process step implementing signals to said plurality of means for effecting the reproducing steps in said second mode of operation.

2. The control apparatus according to claim 1, wherein said first means comprises a first circuit means and wherein said second means comprises a second circuit means.

3. The control apparatus according to claim 2, wherein said first circuit means is adapted to start and stop the operation of said scanning means while said document original feeding means is held in a disengaged position, and said second circuit means is adapted to start and stop the operation of the reproducing steps upon the detection of the leading edge and trailing edges of the document original being fed by said document original feeding means held in an engaged position while said scanning means is held in said stationary position.

4. The control apparatus according to claim 3, wherein said second circuit means is adapted to stop the operation of the machine when the trailing edge of document original is detected before the trailing edge of the copy sheet is detected.

5. The control apparatus according to claim 3, wherein said second circuit means is adapted to enable said machine to stop the operation when the trailing edge of copy sheet is detected before the trailing edge of the document original is detacted.

6. The apparatus according to claim 3, including: means for detecting the mode changeover from said first mode to said second mode and generating a changeover signal and means responsive to said changeover signal for automatically completing the changeover operation and enabling said means for generating said plurality of process step implementing signals.

7. The control apparatus according to claim 6, wherein said machine includes a drive means for driving a plurality of moving parts of said machine, mode change starting means including lever means for moving said document original feeding means to an engaged position from a disengaged position for setting the machine in said second mode, means for coupling said document original feeding means to said drive means as said document original feeding means is moved to said engaged position by said lever means, means for sensing the movement of said automatic document feeding means toward said engaged position, means responsive to said movement for generating a mode change order signal indicative of a change from said first mode to said second mode and a second mode status signal, and said second circuit means being adapted to respond to said mode change order signal for completing the mode change and to respond to said second mode status signal for operating said machine in said second mode.

8. The control apparatus according to claim 7, wherein in said first mode, said movable scanning means is returned to a home position after a scanning operation and set normally, said mode change order signal enabling said machine to move said scanning means to the end of scan position, and means for retaining said scanning means at the end of said scan position in response to said second mode status signal.

9. The control apparatus according to claim 8, including a DC power source, first sensing means for sensing said scanning means being positioned at the home position and generating a logical signal of one state and generating a logical signal of opposite state when said scanning means leaves the home position, second sensing means for providing a logical signal of one state when said document feeding means is in said disengaged position and changing said logical signal to its opposite state when said document feeding means is moved to said engaged position, third sensing means for sensing the movement of said document feeding means toward said engaged positiOn and adapted to supply said DC power to said first and second logic means, said second circuit means adapted to be responsive to the change of the state of the output of said second sensing means to provide a signal for preventing said copy sheet feeding means from feeding copy sheets and for enabling said scanning means to move to the end of scan position, fourth sensing means sensing said scanning means reaching said end of scan position, and means including said second circuit means responsive to the output of said fourth sensing means for retaining said scanning means at the end of scan position, and conditioning said machine to operate in said second mode.

10. The control apparatus according to claim 9 wherein said first, second and fourth sensing means include switches held in one state normally and said third sensing means includes a one-way roll-over switch.

11. The control apparatus according to claim 10, including a visual indicating means, said second circuit means adapted to turn said indicating means off, said second circuit means being adapted to respond to the change in the output of said mode change sensing means to turn on said visual indication means, said visual indicating means including ''''WAIT'''' status lamp which lights when turned on, and said second circuit means being responsive to the change in the output of said fourth sensing means for turning off said visual indicating means.

12. The control apparatus according to claim 10, wherein said second circuit means is responsive to said mode change signal for causing said copy sheet feeding means to disengage from said drive means while said lever means is being moved to place said document original feeding means to said engaged position.

13. The control apparatus according to claim 1 wherein said apparatus is adapted to provide said mode changing operation for said machine having means for making copies of different sizes from different size document originals selectively.

14. The control apparatus according to claim 1 including an automatic recirculating document feeder for automatically feeding the same or different document originals in succession past the scanning means.