JPS59140438A - Multiplex magnification mode type copying equipment - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

BACKGROUND OF THE INVENTION This invention relates to a multi-magnification mode copying apparatus, and more particularly to a multi-magnification mode copying apparatus, including a full-speed and a half-speed scanning mirror system, a lens for forming an image of an object to be copied, and The present invention relates to a copying device including means for shifting to any one of a plurality of predetermined positions along an axis.

A typical device of this type is the Xerog Twick copier, which uses full-speed and half-speed scanning mirror systems.

In such copiers, when a standard lens is used, changing the magnification mode requires simply shifting the lens along its optical axis, while also moving the half-speed bell system to the correct conjugate distance. must be maintained. When the original to be copied and the data line for the resulting copy are aligned with the centerline of the system, each of the necessary movements of the lens and half-bell system can be performed in a relatively linear manner. That is, originals and copies of different sizes need to be aligned symmetrically on either side of the center line.

This is known as central alignment. However, the most convenient for copier operators is the edge alignment method, in which one edge of every original and copy is the data line. This allows the lens to be adjusted by the appropriate amount for each magnification mode. It is also necessary to move it in a direction transverse to its optical axis.The relationship between the required movements becomes complex and more than one magnification mode is required to achieve the desired position of the lens and half-velocity mirror system. The mechanisms for this will become even more complex.

If you use a zoom lens on a copy machine with multiple magnification mode,
There is no need to shift the half-speed bell system for different magnification modes, but the relative positions of the lens elements must be changed. Also, like standard lens-based copiers, edge alignment requires that the zoom be shifted transversely to its optical axis.

Examples of center-registered variable magnification copying devices using standard lenses that shift the lens and semicontinuum to change magnification are disclosed in British Patent No. 2,074,742A and U.S. Pat. No. 4,168,905. An example of an edge-aligned variable magnification copying device using a zoom lens system in which the zoom lens is moved in a direction transverse to its optical axis w1 without shifting the semicontinuum is disclosed in British Patent Application No. 20590.
No. 83A and No. 2073899A.

An example of edge-aligned, dual-magnification mode copying mounting using a standard lens system, in which the lens is moved both along and across its optical axis, and also semi-continuously, is given in U.S. Pat. No. 3,614,222.

OBJECTS OF THE INVENTION It is an object of the present invention to provide a simple multi-magnification mode copying device using standard lenses, full speed and half speed scanning systems, and edge alignment.

Another object of the invention is to provide a device using a single drive means for moving the lens both along its optical axis and transversely to the lens and at the same time changing the magnification by moving the half-speed bell system. It is about providing.

Yet another object of the invention is to provide an apparatus in which the means for shifting the lens and half-velocity mirror system consists of a simple, inexpensive and reliable cable/pulley system.

SUMMARY OF THE INVENTION According to the invention, a platen on which an object to be copied is placed, a system of full-speed and half-speed scanning mirrors for scanning the platen, a lens for forming an image of the object, and a lens for forming an image of the object. means for shifting the lens to any one of a plurality of predetermined positions along the optical axis to change the magnification mode of the copying device; and simultaneously shifting the lens transversely to the optical axis by an appropriate amount for each of the predetermined positions. , depending on the magnification mode, consists of means for maintaining one edge of the image adjacent to one edge of the copy, and means for simultaneously shifting the half-speed scanning mirror system to obtain the necessary conjugate length of the lens. the means for shifting comprises a first cable/pulley system;
The means for shifting the half-speed bell system consists of a second cable/pulley system, and these two cable/pulley systems
A multi-magnification mode copying device is obtained which is arranged to be driven by two drive means.

These and other objects, features, and advantages of the present invention will become apparent from the following detailed description of the preferred embodiments of the invention, which are illustrated in the accompanying drawings.

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a xerographic copying machine incorporating the present invention. The copying apparatus includes a photoreceptor drum 1 rotatably mounted (clockwise in FIG. 1) for passing the photoconductive imaging surface of the drum sequentially to a series of xerographic processing stations: a charging station; 2,
Imaging station 3, development station 4, transfer station 5 and cleaning station 6. Charging station 2 consists of a corotron which deposits a uniform electrostatic charge on the photoreceptor. The original to be copied is placed on a platen 13 and scanned by a movable optical scanning system to form a fluid optical image on the photoreceptor drum 3. The optical image selectively neutralizes the photoreceptor according to the shape of the image, thereby creating an electrostatic latent image of the object on the surface of the drum. At development station 4, the electrostatic latent image is brought into contact with toner particles;
By depositing onto the charged areas of the photoreceptor, the electrostatic latent image is developed into a visible image. A cut sheet of paper is moved synchronously with the image on the drum surface to a transfer station 5, where the developed image is transferred to a copy sheet.

At the transfer station 5, a transfer corotron 7 provides an electric field to aid in the transfer of toner particles. The copy sheet is then peeled off from the drum 1, and this peeling is carried out using an AC peeling system and a corotron 8.
promoted by the electric field given by . The copy sheet with the developed image is then transported by transport belt system 9 to fusing station 10.

After transfer of the developed image from the drum, some toner particles typically remain on the drum, and these residual particles are removed at cleaning station 6. After cleaning, the static charge remaining on the drum is removed by an AC removal corotron 11. The photoreceptor is then ready to be charged again by the charging corotron as the first step in the next copy cycle.

The optical image at the imaging station 3 is formed by an optical system 12 . An original to be copied (not shown) is placed on a platen 13 and illuminated by a light source 14 mounted on a scanning carriage 15. The scanning carriage also supports a mirror 16. Mirror 16 is a full speed scanning mirror in a full speed/half speed scanning system. The full-speed mirror 16 reflects a band-shaped image of the original to be copied onto the half-speed scanning mirror 17. This image is deflected by a fixed mirror 19 and focused onto the drum 1 by a lens 18. In operation, the full-speed mirror 16 and light source lamp 14 move at a constant speed across the apparatus, while the half-speed mirror 17 simultaneously moves at half speed in the same direction. At the end of the scan, each line is in the position indicated by the dotted line on the left side of FIG. These movements of the mirror maintain a constant optical path length and accurately focus the image onto the drum throughout the scan.

At development station 4, a magnetic brush development system 20 develops the electrostatic latent image. Toner is distributed by rotating foam roll distributor 2
2, the developer is dispersed from the developer housing 21 to the developer housing 23. The housing 23 contains a two-component developer mixture of magnetically attractive carrier and toner, which mixture is brought into development engagement with the drum 1 by a 20 single magnetic brush developer.

At transfer station 5, the developed image is transferred to a sheet of copy paper (not shown) which is brought into contact with a drum by paper feed system 25.
transferred from the drum. Sheets of copy paper are stored in the main tray 26 above the paper tray tab and the auxiliary tray 27 below. If necessary, the top copy sheet of either tray can be shared The zero sheet feeder 28 in feeding engagement with the sheet separator/feeder 28 in a fixed position curvature feeds the sheets along the id 29 and is aligned at the registration point 30. After registration, the sheet is brought into contact with the drum synchronously with the image and receives the image at transfer station 5.

The copy sheet with the transferred image is conveyed by a vacuum transport belt 9 to a fusing device 10 consisting of a heated roll fuser. The image is fixed to the copy sheet by heat and pressure between the two rolls of the fuser. The final copy is conveyed by the roll of the fixing device along the exit guide 31, via the exit roll 31a, to the catch tray 32. The catch tray is preferably of an offset type.

After transfer of the developed image from the drum to the copy sheet, the drum surface is cleaned at a cleaning station 6.

In the cleaning station, the housing 33 forms a sealed cavity together with the drum 1, and a doctor blade 34 is mounted inside this cavity. The doctor blade 34 scrapes residual toner particles from the drum and the scraped particles fall to the bottom of the housing where they are removed by the -35.

Next, referring to FIG. 2, the main elements of the optical system are shown, and the reference numbers in the diagram correspond to those in FIG. Also shown is a copy sheet 38 having a developed image of the information on the document 36.

Scanning Optics The full-speed and half-speed scanning mirrors are scanned by the scanning device shown in FIG.

In the following description, reference will be made only to the pulleys and cables that operate the scanning system and are located on the front side of the copying machine. On the back side of the copying device there is a corresponding pulley and cable with the same shape.

When making a copy, the platen, lens and fixed mirror 1
9 (Figures 1 and 2) is stationary, while full speed bell 16
is a full-speed carriage 1 supporting a light source lamp 14 and a reflector 37
5) across the platen 13. At the same time, the half-speed mirror 17 is moved by the half-speed carriage 41 to the full-speed mirror 1.
6, but at half the speed.

The cable 45 has one end fixed to the full-speed carriage 15, extends from there to the right, and is wound clockwise around the drive capstan 47.

The cable 45 is wrapped at least twice around a capstan 47 which is mounted on a capstan shaft 46 driven by a scanning motor (not shown), and then extends to the left to wrap around the outer circumference of a fixed shaft pulley 48. Pass in a circular direction. pulley 4
The cable extending from the top of 8 to the right side connects to double pulley 5.
0 in the clockwise direction. The double pulley 50 is rotatably mounted on the half-speed mirror 41.Next, the cable heads to the left and the fixed shaft day! J
-52 in a counterclockwise direction.

The lowest part of the cable 45 goes to the right and is wrapped around the circumference of the capstan 53 at least twice in a clockwise direction. The capstan 53 is connected to the reduction mode drive motor s<(m
(Fig. 6) in either direction via the reduction drive cable s1 (Fig. 86) and the reduction drive shaft 91. The cable 45 passes from the capstan 53 to the right, passes around the outer circumference of the fixed shaft pulley 56 in a counterclockwise direction, and then returns to the left and passes through the second portion of the double pulley 50 in a clockwise direction. . From the top of the double no.

To perform a scanning operation, the scan motor is energized to rotate the capstan shaft 46 and capstan 47, which drives the full speed and half speed mirror carriages 15.41 to the right. At this time, through the cable and pulley system,
The half-speed carriage 41 moves in the same direction as the full-speed carriage 15,
Move at half that speed. When it is desired to return the full speed and half speed carriages to their respective original positions, the drive from the scan motor is reversed.

During the scanning operation, since the amount by which the double pulley 50 winds and unwinds the cable is equal, the lower loop of the cable 45, the lower loop pulley 52, the capstan 53, and the pulley 56
The part passing through remains stationary.

The full-speed and half-speed carriages 15.41 are normally held in a "park" position on the right side of the copying device, since this position represents the end of the scanning operation.
To prepare for the normal scan operation from left to right, both carriages must be moved back to the left in a "rescan" motion. A solenoid-operated stop latch is used to latch the full speed carriage 15 to the stop position. At the start of a scan cycle, the exposure light source 14 (
1.2) is illuminated and the stop latch solenoid is activated, releasing the full speed carriage.

The gratch is then actuated to transmit drive from the scan motor to the drive capstan 47, causing it to rotate in the direction of re-gearing motion. The process of this drive will be described below with reference to FIG. 4, which schematically shows a gear device of a scanning system.

As shown in FIG. 4, the capstan shaft 46 of the capstan 47 supports four gears 62, 63, 64, 65,
These gears are fixed to a shaft 46 and driven by it. Another four meshing gears 66.67.68.69
is supported by a drive shaft 70 parallel to shaft 46.

The gears 66, 67, 68, 69 are rotatably mounted on the shaft 7°0, and any one of them can be locked against rotation with respect to the shaft 70 by an attached electromagnetic clutch 71, 72, 73, 74, respectively. 3 sets of gears (6
3,67; 64.68; 65.69) are for ordinary scanning systems, and each set corresponds to one enlargement mode. Fourth gear silk (62, 66) U, third intermediate gear 7 which is an idler gear for reversing the rotation direction of the capstan 47
5 and provides the drive for the rescan motion.

The positions of the full speed and half speed carriages are controlled by an optical timing sensor consisting of a light source, a phototransistor optical sensor 78 (FIG. 5), and a timing disk 76. Timing disk 76 is rotatably attached to drive shaft 70 and rotated by capstan shaft 46 . One complete revolution of timing disk 76 corresponds to full speed carriage 15 movement from one side of the device to the other. The timing disk is notched as shown so that the sensor 78 generates an appropriate signal each time it detects light. After scanning, the timing disk 76 is in the position shown in FIG. 5 when the optical system is in the parked position on the right side of the copier. During the rescan motion, the disk (in FIG. 5) remains until the notch edge A of the disk passes sensor 78.
Rotate counterclockwise. This passage generates a signal that tells the device's logic circuitry that rescan clutch 71 should be deenergized. Because drive shaft 70 does not make more than one complete revolution during a scan cycle, it receives only one signal for each unique notch edge of the timing disk during one full scan or rescan cycle.

Drive shaft 70 has a drive pulley 77 for rotation by the scan motor. rescan clutch 7
After the deenergization of the carriage 1, the carriage drive system does not stop immediately due to inertia and the time required for disengaging the clutch. Its movement is stopped by the gas dunning device and the logic circuit of the copying device receives a signal when the optical sensor detects the notch edge B on the timing disk 76, causing the scanning clutch 72, 73, 74 to The appropriate one is energized.The carriage is finally stopped when position C on the timing disk is adjacent to the light sensor.

Both carriages then begin scanning. As the carriage moves forward, an optical sensor detects the notch edge on the timing disc (now rotating clockwise in Figure 5), causing logic circuitry to release the registration edge of the copy sheet and begin copying. Properly synchronize the leading edge of the paper with the image on the photoreceptor.

As scanning occurs, the length of copy paper fed from the paper tray is monitored by the paper path switch, and (if more than one copy is required) the length of copy paper fed is monitored by a distance equal to the length of the copy paper fed. When the full speed carriage scans, the scan clutch 72, 73 or 74 which is energized by the logic circuit is deenergized. Shorten delay (5
After 0m5es), the rescan clutch 72 is activated,
Move both carriages back to the left side of the platen and repeat the entire scan cycle.

If only one copy is required, or if a reduced copy is selected, the device's logic circuitry ignores the paper size signal from the paper path switch and continues to move the carriage until the end of the scan.

In this case, the "home" microswitch is finally energized by the full speed carriage and the scan clutch is deenergized approximately 10111 times before the full speed carriage reaches the right stop position. However, due to the inertia of the system and the time required to disengage the clutch, the full speed carriage will continue to move thereafter, allowing the stop latch to automatically lock the full speed carriage in the correct stop position.

The stop position on the right side of the copier (after "scan" and before "rescan") was chosen to facilitate use of the device in conjunction with a document handler.
The time required to copy the original document is reduced by moving the document along the platen and performing the desired scan. In this case the optical system remains stationary. However, after copying the first original, the optical system t-
Return to scan mode for document number 11.

Reduction optical system The scanning system has been described above regardless of the change in magnification mode.

When changing the magnification of the system, for example from actual size copying to reduction mode copying, the reduction mode drive motor 54 acting through the reduction drive cable 81 and the reduction drive shaft 91 moves the lens 18 into the system. is shifted along the optical path of Movement of this lens along the optical axis requires an appropriate change in the conjugate distance.

In the device of the invention, the necessary adjustment to the conjugate distance is made by moving the position of the half-speed carriage 41. In other words, this movement is caused by the pulley 52, the capstan 53, and the cable 4 of the lower loop stretched around the outer periphery of the pulley 56.
To make this adjustment, the motor 54 is energized to rotate the capstan 53. As a result, without changing the position of the full speed carriage 15,
The position of the half-speed carriage 41 can be changed.

Of course, the angular momentum of the capstan 530 can be selected to take into account the gearing available with the various pulleys to move the half-speed carriage 41 the desired distance.

Lens 18 is movable from a standard position, where a full-size copy of the original yjL draft is made, to one of two positions, which provides a reduced mode copy.

This introduces the complication that the relationship between lens position and half speed carriage position is not linear. Better, when moving from the full-size copy to the first reduction mode, the lens must be moved several times the half-speed carriage, and the text box 1
When moving from the reduced mode to the second reduced mode,
Both the rend and the half speed carriage must be moved approximately the same distance.

Copy machines that provide edge alignment also require shifting the lens across its optical axis to align the edges of the reduced size image with the edges of the photoreceptor (and thus the copy). Therefore, the lens undergoes a more complex movement when shifted from the specimen position through the first reduction mode position to the second reduction mode position. The amount of lateral shift required also
There is no linear relationship with the axial movement distance of the lens.

Next, referring to FIG. 6.7, a method of changing the magnification mode by moving the lens and the half-speed carriage will be described. fJ
Figure iL6 is a schematic perspective view showing a mechanism for adjusting the position of the half-speed carriage 41 and simultaneously driving the lens 18 along the optical axis. However, the view is from the rear of the copying machine so that the scanning cable and pulley shown are at the front of the machine as described in FIG.

The three movements required to change the magnification mode, half-speed carriage position shift, axial lens movement, and lateral lens movement, must all occur simultaneously. First, with reference to FIG. 6, we will look at the shift of the half-speed carriage and the lens movement in the axial direction. Changing the magnification mode is accomplished by energizing the motor 54. The motor 54 has a capstan 80 which drives a reduction mode drive cable 81 which moves in either direction along the loop starting from the lens carriage 82 of the lens 18 to which it is secured.

The cable 81 starting from the point of attachment to the lens carriage 82 connects two idler pulleys 83, a capstan of a friction clutch 84 mounted on a reduction drive shaft 91,
Idler pulley 79, capstan 80 of motor 54
and further K (passes each outer periphery of the D idler pulley 99 and returns to the lens carriage 82.

When the motor 54 is driven and the solenoid 85 is energized, the plunger 86 of the solenoid moves to the left in FIG. The left end of the syringer 86 engages a crank lever 88, and the crank lever pin 87 is connected to a positioning disk 90.
from one of the notches 89. The disk 90 is
It is supported by a reduction drive shaft 91 to which a friction clutch 84 and a capstan 53 are attached. Plunger 8
As 6 moves to the left, slotted arm 92 is pulled and the slotted end of arm 92 engages pin 93 and pulls it to the left. The pin 93 is attached to a crank lever 94 which has another pin 95 at its other end. Therefore, the bins 95 are simultaneously moved and disengaged from one of the notches 96 formed in the lens carriage 82.

The rotational movement of the gear stan 80 of the motor 54 causes the disk 90 and the capstan 53 of the shaft 91 to rotate. Rotation of capster 153 moves half-speed carriage 15 to a position for the newly selected magnification mode determined by the position of the appropriate notch 89 on positioning disk 90. When this movement begins, the renoids 85 are deenergized and the pins 87 fall back into their respective notches 89 under the action of the springs 970, positioning the half-speed carriage 15 and locking the rotation of the shaft 91. Since the amount of movement of the lens 18 is not equal to the amount of movement of the half-speed carriage, additional driving is required for the lens. As a result, the friction clutch 84 slips, and under the action of the spring 98 the bottle 95 engages the corresponding notch 96 of the lens carriage 82 at the neck.
O motor 5 that continuously moves the lens carriage 82
4 is stopped in response to the drop of bin 95 into notch 96, which drop is detected by a microswitch or optical means.

As previously mentioned, lens 18 also needs to be moved transversely to its optical axis. Referring now to FIG. 7, lens 18 is supported on lens pedestal 100, and lens pedestal 100 is further mounted onto lens carriage 82 by a pair of parallel links 101 and 102. Both links 10
The right end of 1,102 (in Fig. 7) is the lens carriage 8.
2, the left end of which is attached to the top of the
It is rotatably attached to the lower side of the lens stand 100. Lens carriage 82 is mounted on goal slide 103 to move approximately diagonally, and is moved in that direction by reversible motor 54 and cable 81. The route of the cable 81 is the same as that described with reference to FIG. The portions of the cable 81 between the pulley 99 and the lens carriage 820 and between the lens carriage 82 and the pulley 83 extend in a direction parallel to the slide 103.

Further, a cam surface 107 is located approximately parallel to the slide 103. A cam follower in the form of a roller 108 is connected to the link 10.
The lens stand 100 is supported by a pivot shaft at the left end of the lens stand 100, and moves the lens stand 100 to a desired FW position according to a predetermined magnification mode. The lens stand 100 is elastically biased against the lens carriage 82 (by a spring connecting the two), and the roller 108 is biased so as to always engage with the cam surface 107. Parallel links 101 and 102 serve to ensure that the optical axis of the lens remains parallel to a constant direction at all times.

Additionally, there are complex conditions that require the system to be able to accommodate the manufacturing tolerances of the lens and make adjustments to the initial settings of each component. In particular, the focal length of a lens, even if finished to very tight tolerances, will vary by the amount of kinematics.This adjustment is dependent on the position of each notch 89 on the positioning disk 90, and the relative position of both the full-speed and half-speed carriages. This is achieved by adjusting the lens and matching it with each individual lens.

In this respect, the disk 90 is formed from three separate disk elements, each having one of the notches 89, and one different two disk elements.
This is accomplished by providing a circumferentially extending slot adjacent the notch location on the disc. These slots allow angular adjustment of each notch position and are of sufficient length to accommodate tolerances multiplied by the focal length K of the lens.

Once the three notches are positioned relative to their respective lenses, the three discs are tightened and secured together to form the positioning disc 9o. The disk 90 is the sixth
It is shown in an abbreviated form in the figure.

To summarize the process when the magnification mode is changed, if the copying device is in the actual size copy mode and the first reduction mode is selected, the process proceeds in the following order: is selected.

2. The solenoid lever 85 is energized and the bins 87 and 95 are released from their corresponding notches 89 and 96, releasing the locked state of the half-speed carriage 41 and lens carriage 82 (
.

3. The reduction motor 54 is switched on and starts driving the reduction drive shaft 91 and the lens carriage 82.

4. Solenoid r85 is deenergized.

5. The positioning disk 9o is latted to the reduced position @i. The shaft 91 stops rotating, and the friction clutch 84
slips to allow continued movement of lens carriage 82.

&The lens carriage 82 is latched at the #X1 reduction position.

l Once the lens lock bin 95 is positioned, the motor 54 is switched off.

If the second reduction mode is selected while the copying device is in full size copy mode, or if the device is already in the first reduction mode and the second reduction mode is selected, each of the above items This is immediately followed by the next process.

8. The solenoid 85 is energized and the half-speed carriage 41 and lens carriage 82 are unlocked. 0 9 The reduction motor 54 is switched on.

10. Solenoid 85 is deenergized.

1t Positioning disc 90 is latched in the second retracted position and friction clutch 84 is slipped.

12, the lens carriage 82 is latched to the reduced position of 2.

16. Once the lens lock pin 95 is positioned, the motor 54 is switched off.

Returning to the full size copy mode or the first reduction mode is accomplished in a similar sequence by reversing the motor 54.

If no reduction mode copy is performed for 50 seconds,
The system automatically returns to full size copy mode.

Platen The platen 13 (FIG. 1.2) is made of laminated soda-lime glass, but has a coating on the underside of a relatively conductive material.

This prevents static charge build-up on the platen. This also makes it easier for the document handler (if used) to stop the document being fed over the platen.

The platen glass is supported only by the front and rear four machining heads on the optical casting table, and is held by the front and rear tightening strips. The lateral alignment edges consist of hard anodized aluminum projections. This protrusion is pivotable downwardly by the energization of a solenoid to allow documents to pass freely over the platen when the document handler is used. To prevent the formation of an image of the clearance "gap" that must be left between the platen and the alignment edge, the alignment edge has a protruding piece of white surface on its underside, which injects directly below the platen edge. It extends and fills in the gap.

Illumination The original illumination system (FIG. 8) includes a high-output, limited-aperture fluorescent lamp 14 (partially shown by dotted lines) and a cylindrical section magnifying mirror 110.
Consists of. This mirror is press-molded from a polished aluminum sheet and has flat end mirrors 111 at both ends in a plane perpendicular to the lamp axis.These end mirrors are located close to both ends of the lamp diameter and are It serves two purposes: Firstly, it effectively extends the length of the part where the lamp is used;
The mirror correctly positions the lamp by means of its ridges, which abut each curved edge 112 of the lamp 14, which is precisely positioned with respect to the optical axis of the imaging system. The support plate 113 for the mirror 110 includes a slit 114 which widens towards the ends to compensate for the drop in illumination which is greater towards the ends of the lamp.

[Brief explanation of drawings]

Fig. 1 is a schematic cross-sectional view of a xerographic copying apparatus to which the present invention is applied; Fig. 2 is a schematic perspective view of basic elements constituting the optical system of the copying apparatus of Fig. 1; Fig. 3 is a schematic cross-sectional view of a scanning mirror. A perspective view showing the drive system; FIG. 4 is an end view showing the gear mechanism of the scanning system; FIG. 5 is a view showing the timing disk of the scanning system; FIG. 6 is a schematic perspective view of the lens shift mechanism; FIG. A schematic plan view showing the lens lateral movement mechanism in more detail: and Figure #8 is a perspective view showing a part of the illumination system. 13...Platen, 15...Full speed-carriage, 1
6... Full-speed mirror, 17... Half-speed mirror, 18... Lens, 36... Original, 41... Half-speed carriage, 45...
... Cable, 47 ... Drive capstan, 48.5
2, 56...Fixed shaft pulley, 50...Double pulley, 53...Capstan, 54...Reduction mode drive motor, 80...Capstan, 81...Reduction drive cable, 82 ...Lens carriage, 79, 83
．． 99... Idler pulley, 84... Friction clutch (torque limiter), 85... Solenoid, 89...
・Disk notch, 90...Positioning disk, 91
... Reduction drive shaft (interconnection shaft), 93.
95...pin (first and 20th locking means), 96...
Lens carriage notch, 100... Lens stand, 1
01.102...Parallel link, 103...is a straight slide)', 107...cam surface, 108...roller (
cam follower). Procedural amendment writing method) March 14, 1980 1. Indication of case: Patent Application No. 175139 of 1982 2. Title of invention: Multi-magnification mode copying device 3.
Relationship with the case of the person making the amendment Applicant name: Seven Wax Corporation 4, Agent

Claims (8)

[Claims] (1) A platen on which the object to be copied is placed;
a full-speed and half-speed scanning mirror system for scanning the platen;
a lens forming a target line; means for shifting the lens to any one of a plurality of predetermined positions along its optical axis; and means for changing the magnification mode of the copying device; Shift the lens transversely to its optical axis by the amount of
means for maintaining one edge of the copy adjacent to one edge of the copy, and means for simultaneously shifting the half-scanning mirror system to obtain the required conjugate length; a multiplex magnification system comprising a pulley system, the means for shifting the half-speed mirror system comprising a second cable/pulley system, and the two cable/pulley systems being arranged to be driven by one drive means; Modal copy device. (2) In the device according to claim 1, the one driving means is arranged to drive the first cable/f-1j- system cable, and the first cable/pulley system cable is Apparatus arranged to drive the interconnecting shaft, the cable of the second table/pulley system being arranged to be driven by the interconnecting shaft for shifting the half-speed plow system. (3) An apparatus according to claim 2, which includes a lens carriage that supports a lens and is arranged to slide along a slide path inclined with respect to the optical axis of the lens. (4) The device according to claim 3, which includes a cam inclined surface inclined with respect to the optical axis and a cam follower attached to a lens holder, and the lens holder is attached to a parallel link on the lens carriage. Rotatably mounted,
A device that keeps the optical axis of the lens parallel to a certain direction, the lens stand is spring-biased against the lens carriage, and the cam follower and cam slope are maintained in alignment. (5) In the device according to claim 3 or 4, the lens carriage has a set of latching notches corresponding to each of the predetermined positions on a surface extending substantially parallel to the slide path. wherein the copying device includes a removable locking means spring-loaded to engage the notch and hold the lens in a selected position. (6) in the apparatus of claim 5, operating a second locking means arranged to cooperate with a latching notch on a disc carried on the interconnecting shaft; The locking means of the tXl described above are also actuated by the solenoid to lock the interconnecting shaft and position the half-speed mirror system in the desired position. (7) In the apparatus of claim 6, one drive means drives the interconnecting shaft through a torque limiter, and after the shaft has stopped, the latching notch on said disk is activated. While the angular movement of the shaft is locked by the twentieth locking means engaging one of the two, the drive means continues until the torque limiter slips and the tenth locking means engages the latching notch in the lens carriage. A device that can continuously drive the lens carriage. (8) The apparatus according to claim 1, wherein the first cable/pulley system drives the full-speed mirror carriage at a constant speed during scanning in a given direction and simultaneously half-speed in the same direction. the first system is rotatably mounted on a fixed shaft at the opposite end of the copying device; consisting of two pulleys, one of which is a ground motion capstan and the other an idler pulley: A double pulley is rotatably attached to a half-speed carriage; a cable with one end fixed to the full-speed carriage is A first portion extends in a predetermined direction to pass around the outer circumference of one of the fixed shaft pulleys, extends in a direction opposite to said direction to pass around the outer circumference of another fixed shaft pulley, and again extends in the same direction as before. The other end of the first part of the cable extends in the opposite direction to the outer circumference of the first part of the heavy pulley and is held in position in the open plane of scanning: the second part of the cable is at full speed at one end thereof. fixed to the carriage and extending in a direction opposite to said direction and passing around the outer periphery of another portion of the double pulley in opposing relation to the first portion of the cable, the other end of the second portion of the t-pull being in said direction; the other ends of both the first and second portions of the cable are joined by a third portion of the cable to form a continuous loop through at least one further pulley; , wherein the drive means is arranged to drive the third portion of the cable along the loop, the position of the half-speed carriage being shiftable relative to the full-speed carriage.