Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.

Patents

  1. Advanced Patent Search
Publication numberUS3921974 A
Publication typeGrant
Publication dateNov 25, 1975
Filing dateOct 3, 1974
Priority dateNov 8, 1973
Publication numberUS 3921974 A, US 3921974A, US-A-3921974, US3921974 A, US3921974A
InventorsJoseph F Miciukiewicz
Original AssigneePitney Bowes Inc
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Sheet orienting apparatus
US 3921974 A
Abstract
Disclosed is an apparatus for properly orienting a thin flexible lithographic master sheet prior to the master sheet being fed to and clamped onto the master sheet cylinder of a lithographic press. The apparatus is basically a flat tray with movable pushers mounted thereon for shifting a sheet deposited on the tray in a lateral direction with respect to the direction of travel of the sheet and also longitudinally along the direction of travel of the sheet in order to place the sheet in a precise predetermined position with respect to a take-away mechanism. The apparatus also includes a movable wire guide device which maintains the sheet in a flat condition while it is being oriented to prevent the sheet from buckling more than the very slight degree which is specifically provided for to assure proper orientation. The device is constructed to be self-powered and readily removable from the duplicating machine with which it is normally associated.
Images(3)
Previous page
Next page
Description  (OCR text may contain errors)

[451 Nov. 25, 1975 United States Patent [1 1 Miciukiewicz SHEET ORIENTING APPARATUS Inventor:

Joseph F. Miciukiewicz, Trumbull, Conn.

Assignee:

Filed:

[73] Pitney B0weS Inc Stamford Conn sheet being fed to and clamped onto the master sheet cylinder of a lithographic press. The apparatus is basi- [22] Oct. 3, 1974 Appl. No.: 511,558

cally a flat tray with movable pushers mounted thereon for shifting a sheet deposited on the tray in a lateral direction with respect to the direction of travel Related U.S. Application Data Division of Ser. No. 413,836, Nov. 8, 1973, Pat. No. 3,877,696.

of the sheet and also longitudinally along the direction of travel of the sheet in order to place the sheet in a precise predetermined position with respect .to a takeaway mechanism. The apparatus also includes a mov- [52] US. able wire guide device which maintains the sheet in a Int. B65H 9/10 flat condition while it is being oriented to prevent the 271/250, 248, 252, 240, sheet from buckling more than the very slight degree which is specifically provided for to assure proper ori- [58] Field of Search entation. The device is constructed to be self-powered and readily removable from the duplicating machine with which it is normally associated.

References Cited UNITED STATES PATENTS 898,831 Casey 271/238 3,871,644 271/250 X 4 -Claims, 5 Drawing Figures Primary ExaminerEvon C. Blunk Assistant Examiner-Bruce H. Stoner, Jr. Attorney, Agent, or Firm-William D. Soltow, Jr.;

Albert W. Scribner; Martin D. Wittstein US. Patent Nov. 25, 1975 Sheet10f3 3,921,974

US. Patent Nov.25, 1975 Sheet20f3 3,921,974

US. Patent Nov. 25, 1975 Sheet30f3 3,921,974

SHEET ORIENTING APPARATUS This is a division, of application Ser. No. 413,836 filed Nov. 8, 1973, now U.S. Pat. No. 3,877,696.

BACKGROUND OF THE INVENTION The apparatus of the present invention has been designed principally for use in a relatively new concept in the graphic duplicating field, that is, in a machine which combines electrostatic copying and lithographic duplicating techniques to produce large numbers of copies of documents. Such a machine, as well as a novel method for producing the copies are disclosed in a copending application Ser. No. 453,274, filed Mar. 21, 1974, now U.S. Pat. No. 3,861,306, and assigned to the assignee of this application. Basically, the concept of the method and machine disclosed in that application is the combination of the electrostatic and lithographic disciplines in such a manner that the electrostatic component of the machine produces a single electrostatic copy of a document in a form suitable for simple conversion of the electrostatic copy to a lithographic master which is then used in a lithographic press to make ink copies of the original document.

While electrostatic copiers and lithographic presses per se have long been well known, the combination machine disclosed in the above mentioned application (which disclosure is incorporated herein by reference) 'provides a totally automatic and continuous sequence of operations, one of which is accomplished by the apthrough the instrumentality of the present invention, to

a lithographic press in which the sheet is first etched with an appropriate etching solution which renders the background areas on the sheet hydrophilic so as to attract water and repel ink, while the image areas remain oleophilic by the nature of the toner particles so that the image areas repel water and attract ink. Thereafter, ink copies are produced in a normal manner. 7

In one form of a combined electrostatic and lithographic duplicating machine shown in U.S. Pat. Nos. Y

3,451,336 and 3,521,560, a lithographic master is prepared by means of electrostatic copying techniques and is then conveyed from the copying apparatus to and through an etching both device, after which the master is convveyed to a lithographic press. No particular means is disclosed in these patents for orienting the master with respect to the master cylinder of the press other than mere guide means defining a path of travel from the etching device to the press. Another U.S. Pat. No. 3,649,005, discloses a type of sheet aligning device which may be used in conjunction with the machine disclosed in the previously mentioned patents, but this device has not proven to be satisfactory since it relies on yieldable spring members to orient a sheet disposed in the wire frame member. The degree of proper orientation is dependent on variable factors such as the flexibility of the sheet material, the extent of moisture in the sheet and variations in the strength of the spring material, all of which affect the relativve freedom of movement of the master sheet within the wire frame. Thus the device is not reliable for lateral alignment, and is totally lacking in longitudinal alignment.

SUMMARY OF THE INVENTION The present invention relates generally to sheet orienting devices and more particularly to such devices for use in orienting master sheets preparatory to loading the sheets onto the master cylinder of a lithographic press.

The device comprises, in its broader aspects, a flat sheet support tray which is adapted to be supported in the duplicating machine in position to receive master sheets from the copying component and to discharge the oriented sheets to a transfer gripper mechanism which forms part of the lithographic press component of the duplicating machine. A suitable feeding means is provided for feeding sheets onto the support tray. There is also provided a movable side edge sheet registering means and movable front edge sheet registering means, each with an independently operable actuating mechanism for moving the sheet both laterally and longitudinally on the sheet support tray in order to establish a predetermined dimensional and time relationship between the sheet and the transfer gripper mechanism of the lithographic press component. Means are provided for initiating operation of the actuating mechanism in a predetermined timed sequence in response to the arrival of a sheet on the sheet support tray.

Preferably, the device also includes a wire guide mechanism which overlies the sheet support tray and which comprises a plurality of wire fingers mounted for movement toward and away from the support tray, there being independently movable front and rear wire guide mechanism and independently operable actuating means for each wire guide mechanism so that they can be actuated in a predetermined timed sequence. Further, all of the actuating means are controlled by cams mounted on a single cam shaft which is driven by a motor mounted on the orienter device whereby the device is self powered and requires only an initiating signal to cause the orienter device to run through a cycle of operation. Preferably this signal is generated in response to the arrival of a sheet on the support tray.

The orienter device of this invention, when interposed between the copying component and the press component of a duplicating machine such as disclosed in the above noted U.S. patents provides a predetermined dimensional and time relationship between two units which otherwise operate asynchronously. Without the device of this invention, it is necessary to precisely synchronize the operation of the copier component with that of the press component in order to assure properly spaced and timed transfer of master sheets from the copier component to the press component.

l-laving described the general nature of the present invention, it is a principal object thereof to provide an orienting device for establishing a predetermined dimensional and time relationship between a sheet and a receiving apparatus to which the sheet is fed by the orienter device.

It is another object of the present invention to provide an orienter device interposed between the electrostatic copier and lithographic press components of a duplicating machine which components have asynchronous operation, the orienter device serving to receive a master sheet from the copier component and properly orient the sheet and deliver it to the press component.

It is a further object of the present invention to provide an orienter device which receives a sheet in flat condition and positively shifts the sheet both laterally and longitudinally in order to precisely register the sheet with predetermined guide means.

It is yet another object of the present invention to provide an orienter device in which all of the sheet moving and restraining instrumentalities of the device are powered by means contained within the orienter device so that the device is self powered and modular, thereby making the device easily removable from the duplicating machine for service or replacement.

It is a still further object of the present invention to provide an orienter device which is reliable in operation, relatively inexpensive to manufacture and maintain and which requires substantially no operator control.

These and other objects and advantages of the present invention will be more readily appreciated from an understanding of the following detailed description of a preferred embodiment of the invention when considered in conjunction with the accompanying drawings in which:

. FIG. 1 is a plan present invention,

FIG. 2 is a side elevation of the orienter device show in FIG. 1;

FIG. 3 is a sectional view taken on the line 3-3 of FIG. 1;

FIG. 4 is a sectional view taken on the line 4-4 of FIG. 1; and

FIG. 5 is a perspective view of the side edge registering portion of the orienter device shown in FIG. 1 with portions broken away for clarity.

DETAILED DESCRIPTION Referring now to the drawings and particularly to FIGS. 1 and 2 thereof, there is shown a sheet orienting device which comprises a flat, generally rectangular sheet support plate 12 which is dimensioned a little larger in length and width than the corresponding dimensions of the master copy sheet generated by the duplicating machine in which the orienter apparatus will be used. The plate 12 is supported in the aforesaid duplicating machine by apair of side frame plates 14 of which one is shown in FIG. 2, the orienter being mounted in the duplicating machine such that the entry end of the orienter, which is defined by the feed roller pair 16, is disposed adjacent the discharge end of the sheet conveying structure of the duplicating machine which feeds the master sheets to the orienting device 10. The feed roller pair 16 is driven by any suitable connection from the main drive motor 18 of the copying component of the duplicating machine, this motor being continuously driven while the master copy sheet is being made and being turned off after the lithograph press commences to operate. The copying component motor is re-energized when a new copying cycle is initiated, thereby restarting the roller pair 16. Since the particular driving means for the roller pair 16 is not significant to the present invention, it is not shown in detail. The letter M designates a master copy sheet being delivered onto the sheet support plate 12 by the roller pair 16, the sheet M being withdrawn from the upstream conveying structure as mentioned above.

The orienter device 10 in general is provided with movable side edge and lead edgeregistering means in view of the orienter device of the order to establish a predetermined position of the sheet M on the plate 12 both laterally and longitudinally with respect to the direction of travel of the sheet M through the orienter device 10. The device is also provided with a movable sheet hold down means to maintain the sheet M in a flat condition on the plate 12, therebeing a separate and independently movable hold down means for both the entry and exit ends of the orienter device. There is also provided actuating means for moving the side and lead edge registering means and both hold down means all in a timed sequence so that each instrumentality acts on the sheet in a particular timed relationship with the result that the sheet M is presented to a plurality of take-away grippers, generally designated by the numeral 20, at the proper moment and properly located with respect to the grippers 20.

It should be generally noted at this point that the grippers 20 are part of a transfer structure which takes the sheet M from the orienter 10 and transfers the sheet from the orienter to the master sheet cylinder of the lithographic press component of the duplicating machine. This is accomplished by causing the upper and lower gripping fingers 22 and 24 to separate to allow the lead edge of the sheet M to enter therebetween, after which the fingers 22 and 24 close and the entire transfer structure swings in an arc to move the lead edge of the sheet M into the path of a plurality of gripping fingerswhich are mounted on and rotating with the master cylinder of the lithographic press. In a manner well known in the art, the sheet M is then transferred from the transfer gripping structure 20 to the master cylinder gripping fingers and the transfer grippers 20 return to the position shown in FIG. 2 to await the arrival of the next master sheet.

Considering now the above mentioned instrumentalities in more detail, the side edge registering comprises an elongate L-shaped pusher plate generally designated by the numeral 30 and best seen in FIG. 5. The pusher plate 30 comprises an upstanding flange 32 which abuts the side edge of a sheet M to move the latter laterally on the plate 12. The flange 32 is integral with a horizontal plate portion 34 which is suitably supported beneath the plate 12 for limited lateral movement by means of a link 36 (FIG. 1) connected as at 38 to the plate portion 34, the link 36 having an elongate slot 40 which permits limited reciprocatory movement of the link 36 with respect to a pin 42 mounted on the under-' each extension having a pin 46 carried thereby for engagement by a slot 48 formed in one leg of each of two pairs of bell cranks generally designated by the numerals 50, 52, 54 and 56 as best seen in FIG. 1. In other words, adjacent legs 58 and 60, and 62 and 64 respectively of each pair of bell cranks are connected by the pins 46. The bell cranks 50, 52, 54 and 56 are pivotally connected to the plate 12 by pivot pins 66, 68, and 72 respectively. The above arrangement for the bell crank 50 is more clearly shown in FIG. 5. From the construction thus far described, it will be seen that if the bell crank pairs are oscillated about their respective pivots, the pusher plate 30 will be reciprocated inwardly and outwardly within the limits of the engagement between the slot 40 and the pin 42. Two extensions 44 and two sets of bell cranks are provided to assure that the pusher plate 30 remains properly aligned with the support plate 12 and the fixed guide 33 during movement of the pusher plate 30.

In order to oscillate the bell cranks, there is provided a yielded connection between one bell crank of each pair and an actuating mechanism which moves the bell cranks under the influence of a timing cam. Thus, referring again to FIG. 1, each bell crank has an outwardly extending leg 74, 76, 78 and 80 respectively for the bell cranks 50, 52, 54 and 56. The legs 74 and 78 of the bell cranks 50 and 54 each carry a pin 82 on the lower end of each of which is connected one end of a spring 84, the other end of each spring being connected to another pin 86, again each of which is carried by a horizontal tab 88, the two such tabs 88 being formed integrally with the horizontal web 89 of an L-shaped slide bar generally indicated by the numeral 90 (note FIGS. 4 and 5). The slide bar 90 is supported on the orienter by a pair of slot and pin connections, one of which is shown in FIGS. 4 and 5 as slot 92 and pin 94, the latter being mounted in one of the side frame plates 14. The vertical web 96 of the slide bar 90 carries a cam follower 98 which is acted upon by a cam 100 fixed to a cam shaft 102 suitably supported by the side frame plates 14 and extending across the width of the orienter as seen in FIG. 1 and driven by a motor 104 which is mounted on one of the side frame plates 14 in any suitable manner.

By considering the structure thus far described with reference to FIGS. 1, 4 and 5, it will be seen that rotation of the cam shaft 102 in a counterclockwise direction as indicated by the arrows in FIGS. 4 and 5 will cause the cam 100 initially to push the cam follower 98 toward the left as viewed in FIGS. 4 and 5, which will move the slide bar 90 correspondingly within the limits of the engagement of the slot 92 and pin 94. The movement of the slide bar, carrying the two pins 86, will act on the springs 84 to yieldably urge the legs 74 and 78 of the bell cranks 50 and 54 toward the left as seen in FIG. 1, thereby pivoting the bell cranks and moving the side edge pusher member inwardly as heretofore described.

When the cam 100 rotates sufficiently to allow the follower 98 to move toward the right as viewed in FIG. 4, the slide bar 90 will be urged in the reverse direction by any suitable yielding means such as the tension spring 106 connected between the right end of the slide bar and any suitable fixed point on the orienter 10. This return movement of the slide bar 90 will in turn act through the yieldable connection between the slide bar 90 and the bell cranks and 54 to allow the latter to return to their normal position under the influence of the spring 106 which causes the edges 91 of the tabs 88 to contact the pins 82 thereby pushing the bell cranks 50 and 54 to their normal position, which will in turn move the side edge pusher member 30 outwardly to its initial position.

In order to properly register a sheet M on the plate 12, the latter is provided with an upstanding flange 33 (FIG. 1) on the sie of the plate 12 opposite from the flange 32 of the movable pusher plate 30. It will be apparent that the distance between the flange 32 and 33 may be such that the movable pusher plate 30 moves the sheet M laterally on the plate 12 just far enough that the side edge of the sheet M abuts the flange 33, which thereby constitutes a fixed side guide for the sheet M.

Preferably, however, the movable pusher mechanism just described is designed to push the edge of the sheet which it contacts a little closer to the fixed side guide than the width of the sheet, thereby producing a slight longitudinal buckle in the sheet, after which the movable pusher backs off a small amount so that the sheet lies flat on the plate 12. The advantage of this is to assure that the sheet M, which is still slightly damp from the developer solution and somewhat limp, is properly registered withthe fixed side guide 33. This function is accomplished in the following manner. Referring again to FIGS. 1 and 4, it will be seen that the horizontal web 89 of the L-shaped slide bar 90 is provided with a pair of tabs 108 and 110 which project outwardly far enough to contact a pair of pins 112 and 114 respectively carried by the legs 76 and of the bell cranks 52 and 56. The tabs 108 and 110 contact the pins 112 and 114 just a little in advance of the point where the cam 100 has moved the cam follower 98 through its full extent of movement toward the left as viewed in FIGS. 4 and 5, with the result that at the moment of contact of the tabs with the pins, the slide bar will still move further toward the left upon continued rotation of the cam 100.

With the above in mind, it will now be noted that the parts are dimensionally related so that the flange 32 has moved the side of the sheet M which it contacts closer to the fixed flange 33 than the width of the sheet, thereby producing the longitudinal buckle, at the time when the tabs 108 and 110 contact the pins 112 and 114, so that the sheet M is now properly registered with the fixed flange 33. Upon continued rotation of the cam and slight further movement of the cam follower 98 toward the left, the slide bar 90 and the tabs 108 and will also move further toward the left, as viewed in FIGs. 1 and 5, and this will cause a slight rotation of the bell cranks 52 and 56 in a counterclockwise direction. This in turn will cause a slight reverse movement of the pusher plate 30 thereby slightly moving the flange 32 away from the fixed flange 33 to the point where the sheet M lies flat on the plate 12. The slight reverse movement of the bell cranks 50, 52, 54 and 56 while the slide bar 90 is still moving toward the left is accommodated by the spring connections 84 between the pins 86 on the slide bar 90 and the pins 82 on the bell cranks 50 and 54. The springs 84 are selected to have sufficient strength to rotate the bell cranks to move the pusher plate 30 inwardly until the tabs 108 and 110 strike the pins 112 and 114, but to yield at that point to allow the slight opposite rotation of the bell cranks to withdraw the pusher plate enough to allow the sheet M to lie flat. The dimensions of the parts are selected so that the pusher plate flange 32 will be spaced from the fixed side guide 33 by approximately the width of the sheet M when the pusher plate 30 has moved to its final position so that the flange 32 and guide 33 form a channel for guiding the sheet M in a straight path when the sheet M is moved in a longitudinal direction as hereinafter more fully described.

The orienting device 10 is provided with a wire guide mechanism which overlies the plate 12 in spaced relation therewith. The wire guide mechanism functions to guide the lead edge of the sheet onto the plate 12 while the sheet is being moved thereon by the feed rollers 16, to hold the sheet flat while it is being registered with the fixed side guide 33 and to prevvent the sheet from being lifted off of the plate 12 by a vacuum drying device which is located over the orienting device 10 in the copier-duplicating machine in order to achieve further drying of the sheet M while it is waiting to be loaded onto the master cylinder of the lithographic press. The wire guide mechanism is divided into two independently movable front and rear wire guides, each with its own actuating mechanism to move the wire guide mechanism toward and away from the plate 12.

More particularly, and with reference to FIGS. 1 and 2, there is provided a front wire guide comprising a plurality of wire fingers 120 which are suitably rigidly mounted on a shaft 122 which in turn is rotatably supported by the side frame members of the orienter 10. As best seen in FIG. 2, the fingers 120 normally lie a slight distance over the upper surface of the plate 12, and are movable from the solid line position to an elevated position shown in dotted lines by means yet to be described. The rear wire guide comprises a plurality of similar wire fingers 124 which are rigidly mounted on another shaft 128 which in turn is rotatably supported by the side frame plates of the orienter. The rear wire guide fingers 124 normally lie in an elevated position with respect to the plate 12 as shown in the solid line position in FIG. 2 and are movable to the flat position shown in dotted lines by actuating mechanism yet to be described. Any suitable spring means, such as the leaf springs 130 (FIG. 2) may be employed to maintain the front and rear guide fingers in their respective solid line normal position. It will now be apparent that rotation of the shafts 122 and 128 in a clockwise direction will raise the front guides 120 and lower the rear guides 124, and rotation of the shafts in the opposite direction will lower the front guides and raise the rear guides. It should be noted that the front and rear guide fingers are not mounted on the same shaft because movement thereof is sequential rather than simultaneous by the actuating mechanism to be described.

Referring to FIG. 2, a link 132 is rigidly connected to the shaft 122 and projects downwardly beneath the plate 12, the link 132 carries a cam follower 134 which engages a cam 136 rigidly mounted on the shaft 102 previously described. Another link 138 is rigidly connected to the shaft 128 and projects downwardly beneath the plate 12, the link 138 also carrying a cam follower 140 which engages a cam 142 rigidly mounted on the shaft 102 adjacent to the cam 136. The spatial relation of the links, cam followers and cams can be seen in FIG. 1, wherein it will be seen that at least the links 132 and 138 which project above the plate 12 are outside the fixed guide flange 33 so as not to interfere with proper registration of the sheet M against the flange 33. Referring back to FIG. 2, it will be seen that tension springs 144 and 146 are connected at one end respectively to the lower end of the links 132 and 138 and at the other end to a pin 148 mounted in the adjacent side frame member, the springs serving to maintain the cam followers 134 and 140 in continuous contact with their respective cams.

From the structure thus described, it will be apparent that rotation of the shaft 102 and the cams 136 and 142 will cause the cam followers 134 and 140 to move from the positions indicated by the circles which have numeral lead lines connected thereto to the adjacent positions indicated by the circles without lead lines. This causes corresponding rotation of the links 132 and 138 and the shafts 122 and 128 which in turn rotates the guide fingers 120 and 124 with respect to the plate 12 as hereinabove described. As will be explained in more detail later, the cams 136 and 142 are shaped so as to produce the aforementioned movement of the guide fingers and 124 in a predetermined timed sequence along with the other functions of the orienting device 10.

The orienter 10 is also provided with a lead edge registering means which acts upon the trail edge of the sheet after it has been deposited on the support plate to move the sheet longitudinally to a predetermined location in which the lead edge of the sheet is properly registered with the transfer gripper mechanism 20 associated with the lithographic process component of the duplicating machine. This gripper mechanism and its interaction with the orienter device of the present invention will be better understood from the following detailed description.

Referring to FIGS. 1 and 3, there is shown a slide plate 150 mounted on the under surface of the plate 12 by means of a suitable screw and washer fastener 152, the slide plate 150 having elongate slits 154 which permit limited movement of the slide plate 150 longitudinally of the support plate 12. The right hand end of. the slide plate 150 is provided with a plurality of upstanding fingers 156 which project upwardly through elongate notches 158 formed in the support plate 12. An L-shaped link 160 is connected by means of screw and nut fasteners 162 to the slide bar 150, the depending leg 164 of the link 160 having one end of a tension spring 166 connected thereto, the other end of which is connected to a depending tab 168 which is suitably connected to the support plate 12. Thus, the spring 166 acting through the link 160 and the slide bar 150 maintains the fingers 156 in their normal solid line position shown in FIG. 3. It should be noted that the rearmost.

position of the fingers 156 is substantially beneath the feed rollers 16 so that the trail edge of the sheet M will be deposited in front of the fingers 156.

An actuating mechanism is provided for alternately moving the fingers 156 to the dotted line position shown in FIG. 3. Thus, the link 160 is provided with an angled, downwardly extending tab 170 which is engaged by a pin 172 carried by the upper end of a rocker arm 174 rotatably mounted on a shaft 176 suppoted between the side frame plates 14. The rocker arm 174 also carries a cam follower 178 which is engaged by a cam 180 mounted on the shaft 102 heretofore described. It will now be apparent that rotation of the shaft 102 and the cam 180 moves the cam follower from the solid line position of FIG. 3 to the dotted line position which in turn rocks the arm 174 to move the pin 172 to the left hand dotted line position, thereby moving the link 160, the slide bar 150 and the fingers 156 toward the left until the fingers 156 reach the dotted line position thereof. The fingers 156 bear against the rear edge of a sheet M in order to register the lead edge thereof with the aforementioned transfer gripper mechanism as now to be described.

As briefly mentioned in the early portion of the detailed description of the invention, the transfer gripper mechanism 20 comprises a pair of gripper fingers 22 and 24 which separate by suitable mechanism which need not be further described to allow the lead edge of a sheet M to enter therebetween and be gripped by the fingers 22 and 24 after the fingers close. The gripper structure 20 then swings in a predetermined arc from the position shown in FIG. 2 to a remote location where the lead edge of the sheet is transferred from the transfer gripper 20 to gripping fingers mounted on the rotating master cylinder. The edge of the support plate 12 is provided with notches 182 to allow spaced portions of the lead edge of the sheet accessible to the grippers 20. It will be understood that the orienter device is mounted in the duplicating machine so that the notches 182 are properly aligned with the plurality of grippers both laterally and longitudinally with regard to the right hand limit position of thegrippers 20 as viewed in FIG. 2. Also, the parts of the orienter 10 associated with the limits of movement of side pusher plate 30 and the rear pushing finger 156 are designed so that the sheet is in the desired position with respect to the grippers 20 when the pushers are at the limit of their movement.

There has been described thus far the structure by which a desired dimensional relationship is established between the master sheet and the transfer gripper mechanism. Now to be described is the means by which a desired time relationship is established between the master sheet and the gripper mechanism so that the dimensional relationship is properly timed with the movement of the grippper mechanism and the other operating components of the duplicating machine. This is best accomplished by describing a cycle of operation of the orienter device in conjunction with its function in cooperation with the copying and duplicating com-.

ponents of the entire duplicating machine.

When it is desired to make several copies of a document, the document is placed in the copying component and the latter is energized to make an electrostatic copy of the document by electrostatic techniques well known in the art and which form no part of the present invention. However, when the copier component is energized, the main driving motor 18 for the copier component begins to run and this drives the feed rollers 16 through any suitable connection. When the master sheet M exits from the copier component, it is directed into the nip of the feed rollers 16 by any suitable guide means and the feed rollers 16 move the sheet M onto the support plate 12. At this point, the rear wire guide fingers 124 are in their elevated position, the front wire guide fingers 120 are in their lower position, the side pusher plate 30 is in its outermost position and the rear pusher fingers 156 are in their outermost position, all as shown in the solid line positions of these parts in the drawings. Also, the transfer gripper mechanism 20 of the lithographic press is in the position shown in FIG. 2.

As the sheet M moves along the support plate 12 under the influence of the feed rollers 16, the lead edge of the sheet passes between a photocell 183 suitably mounted on the under surface of the support plate 12, the photocell normally receiving light through an aperture 184 in the plate 12 from any suitable source of illumination 186 mounted over the plate 12. The function of the photocell 183 is to energize the motor 104 of the orienter 10 to start driving the shaft 102 on which all of the previously described actuating cams are mounted. When the lead edge of the sheet M blocks the illumination to the photocell and energizes the motor 104, there is an initial period of rotation of the shaft 102 during which nothing happens to allow the entire sheet M to be fed through the feed rollers 16 and to settle upon the support plate 12. It should be noted at this point that normally the sheet M will be entirely upon the support plate 12 before the lead edge thereof reaches the exit end of the support plate; howevver, in the unlikely event that the sheet M tends to over-travel the orienter device, the lower gripper finger 24 of the transfer gripper 20 is formed with a nose portion 25 10 which lies in the path of movement of the sheet M and acts as a front stop to prevent further movement of the sheet.

After the sheet M has settled upon the support plate 12, further rotationof the shaft 102 causes the cam 142 to rotate to the point where the cam follower 140 allows the link 138 to pivot in a clockwise direction under the influence of the spring 146 thereby rotating the shaft 128 to drop the wire guide fingers 124 to the dotted line position shown in FIG. 2. At this point both the frontand rear' wire guide fingers are in their depressed position. Next, the cam 100 begins to move the cam follower 98 toward the left as viewed in FIG. 5, thereby moving the L-shaped slide plate and pulling on the springs 84 so as to rotate the bell cranks 50, 52, 54 and 56 in their respective proper directions so as to move the pusher plate 30 toward the fixed side guide 33, thereby moving the sheet M laterally in the same direction, and'causingthe longitudinal buckle in the sheet M at a point just before the cam 100 exerts its greatest influence on the cam follower 98. Further rotation of the cam 100 then causes the tabs 108 and 1 10 to engage and push on the pins 112 and 144 to cause slight counter rotation of the bell cranks 50, 52, 54 and 56 in order to slightly retract the pusher plate 30,

thereby allowing the sheet M to assume a fully flat position on the plate 12.

At this point the cam 180 begins to move the cam follower 178 to rock the arm 174 in a counterclockwise direction to move the link and slide bar 150 toward the left, thereby moving the rear edge pusher fingers 156 to the dotted line position of FIG. 3 and moving the sheet M toward the exit end of the orienter l0.

Immediately after the rear pusher fingers 156 reach the limit of their movement, the transfer gripper mechanism 20 of the press component grips the leading edge of the sheet M. At that point, the cam 136 has rotated far enough to commence movement of the cam follower 134 in order to pivot the link 132 in a counter clockwise direction against the urging of the spring 144 thereby rotating the shaft 122 in the same direction to raise the front wire fingers 120 to their dotted line position. At this point, the transfer gripper mechanism 20 swings away from the orienter 10 and carries the sheet M therewith for transfer to the master cylinder of the press component.

When the trailing edge of the sheet M passes the photocell 183, the motor 104 is not deenergized because a holding circuit switch 188 having an actuating arm 190 is held closed by the action of another cam 192 mounted on the shaft 102. Thus the shaft 102 continues to rotate until it reaches its home position or the position it occupied at the beginning of the cycle. During this continued rotation of the shaft 102, the cams 136 and 142 sequentially reset the rear and front wire guide fingers by reverse movement of the parts described above, and similarly the cams 100 and continue rotation to the point where the side pusher plate 30 and rear pusher fingers 156 are reset to their original positions. When the shaft 102 has completed one revolution, the cam 192 allows the switch 188 to open the holding circuit to the motor 104 thereby deenergizing the motor and completing the cycle of operation of the orienter device 10.

What is claimed is:

1. A sheet orienting device for establishing a predetermined position of a sheet having a predetermined width and consisting of a relatively soft and limp mate- 1 1 rial, said device comprising:

A. an elongate relatively flat sheet supporting member having a fixed side edge guide extending along one longitudinal edge of said supporting member,

B. sheet pushing means extending along the opposite longitudinal edge of said supporting member and normally spaced laterally of said supporting member from said fixed guide by a distance greater than the width of a sheet to be oriented,

C. means mounting said sheet pushing means for limited movement toward and away from said fixed guide, the innermost limit of movement of said pushing means toward said fixed guide being a distance slightly less than the predetermined width of the sheet to be oriented, and

D. actuating means for moving said pushing means toward said fixed guide from said normally spaced position to said innermost position and then back to a position where said pushing means is spaced from said fixed guide by a distance substantially equal to the predetermined width of the sheet, whereby a sheet placed on said supporting member is moved toward said fixed guide and is slightly buckled longitudinally to assure proper alignment of the edge of the sheet with said fixed guide and is then allowed to flatten on the sheet supporting means by said movement of said pushing means away from said fixed guide to said position where its distance from said fixed guide is substantially equal to the predetermined width of the sheet, after which said fixed guide and said pushing means define a channel for guiding the sheet during longitudinal movement thereof.

2. A device according to claim 1 wherein said actuating means comprises:

A. driving means operable through a fixed range of movement,

B. driven means directly connected to said pushing means and resiliently connected to said driving means,

C. means cooperating between said driving means and said driven means for reversing the direction of movement of said driven means before said driving means moves through its full range of movement, said reverse direction of movement of said driven means being accommodated by said resilient connection, and

D. means for moving said driving means.

3. A device according to claim 2 wherein said driving means comprises a slide plate movably mounted adjacent said sheet supporting member and having an abutment means thereon, and wherein said driven means comprises:

A. a first portion directly connected to said pushing means for moving said pushing means,

B. a second portion resiliently connected to said slide bar for moving said driven member in one direction and C. a third portion operatively located to interfere with said abutment means on said driving member for causing said reverse direction movement of said driven member as said slide bar approaches the end of its range of movement.

4. A device according to claim 2 wherein said driving means comprises a slide plate movably mounted adjacent said sheet supporting member and having an abutment means mounted thereon, and wherein said driven means comprises a pair of bell cranks each pivotally secured to said sheet supporting means and each having. one leg connected to a single point on said pushing means, the opposite leg of one bell crank being resiliently connected to said slide bar and the opposite leg of the other bell crank being operatively located to interfere with said abutment means on said slide bar before said slide bar moves through its full range of movement whereby said slide plate moves said bell cranks and said pushing means in one direction through said resilient connection until said abutment means contacts said opposite leg of said other bell crank whereupon said bell cranks and said pushing means are i moved in the opposite direction as said slide plate moves through the rest of its range of movement.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US898831 *Apr 6, 1908Sep 15, 1908Edward J CaseySheet-feeding apparatus.
US3871644 *May 23, 1973Mar 18, 1975Stobb IncSheet stacker with jogger
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4335954 *Mar 4, 1981Jun 22, 1982Xerox CorporationCopier registration method and apparatus
US5215302 *May 28, 1992Jun 1, 1993Eastman Kodak CompanyRegistration mechanism for sheets of different sizes
US5685537 *Feb 1, 1996Nov 11, 1997Eastman Kodak CompanyCross-track and skew justification of cut sheets
US5718057 *Oct 20, 1995Feb 17, 1998Maschinenfabrik Gietz AgRegister draw-in device
EP0708046A1 *Sep 29, 1995Apr 24, 1996Maschinenfabrik Gietz AgRegister and feeding device
EP0752310A2 *Dec 2, 1995Jan 8, 1997Otto KunziFeeding device for metal sheet printing and lacquering machines
Classifications
U.S. Classification271/240, 101/132.5, 271/250
International ClassificationB41L29/12, B65H9/10
Cooperative ClassificationB41L29/12, B65H9/101
European ClassificationB65H9/10A, B41L29/12