US3545743A - Apparatus for drawing in templates into a processing device,more particularly for copying machines and the like - Google Patents

Description

United States Patent [72] Inven Wllm' 'l [50] Field olSearch 271/36,

h lm b -16,2l;40,53,36; 35s/i4 [2]] Appl. No. 721,017 [22] Filed April 12, 1968 [56] References (Iited 1 nt 1 UNITED STATES PATENTS 1 me m and!" 3,343,450 9/!967 Glaser et al ass/14 I 32] Priority :1 :0, i967 any Primary Examiner-Even C. Blunk [33 Assistant Examiner-Roger S-. Gaither [31] N .L56303 Attorney-Me Glew & Toren a ABSTRACT: An improved apparatus for drawing templates APPARATUS FOR DRAWING [N TEMPLATES and paper sheets into a processing device, particularly in A PROCESSING DEVICE MORE copying and transfer printing, in synchronism with a sheet of PARTICULARLY FOR COPYING MACHINES AND paper triggering ofi' a starting impulse at another point of the THE I apparatus, using a transport means forming simultaneously a 10 chlmlsa l limit stop, at which a template, supplied by means of a feed [52] U 1 271/53, roller, is retained for a certain period of time andwhere it Y 271/36 forms a loop under the action of the continuing feeding action, [51] In 9| 1365]. 3/06, yntiljt is drawn into the apparatus by the transport means in 'synchronism with the sheet of paper.

PATENIED HEB slam SHEET 1 BF 7 PATENTEDUEB emu W 2 7 3545743 Q 9 mm hm hm hm Q i v Q. Q v

mm vb mm Rb bo Q 8* kw mm PATENTE B nan slam 3" 5 sum u [1F 7 Fig.5

PATENTED DEC 8 1970 SHEET 5 OF 7 PATENTED DEC 8|970 SHEET 7 BF 7 I1 APPARATUS FOR DRAWING IN TEMPLATES INTO A PROCESSING DEVICE, MORE PARTICULARLY FOR COPYING MACHINES AND THE LIKE ACKGROUND OFTHE INVENTION The invention relates more particularly to the drawing in of copying sheets into a copying device. Such sheets may be held in the copying device in the forrnjof a stack and carried by a feed roller" into a track. containing further transportation means. The term templates" used in this specification includes particularly suchjcopying sheets. 7

The withdrawal 'ofcopying sheets is initiate by an original. In this respect, the term sheet of paper includes an original inacopier. i

In copying devices, forexample, the original and the copying sheet must be guided, either along different paths or along the same path, in accurate relative alignment for, effecting different transfer processes of an optical or chemical nature.

A feed roller acting on the topsheet of a stack does not always operate with an accuracy sufficient to guide different sheets together, and this is due to slipping occurring as a consequence of the, surface properties of the paper.

It is alreadyknown to transportcopyi'ng sheets first into a waiting orfirea dy position in which they are firmly retained by a pair of transport rollers and this pairv of transport rollers is then rotated to effect the drawingin. This arrangement has, on one hand, the drawback of requiring complicated control means, first-for making the definite engagement between the rollers of the first driven and then stopped pair of transport rollers, which must then again-be actuated for drawing in the sheet. On the other hand, it isconsidered a drawback that the pair of transport rollers must be started from standstill till for the drawing'in, because mass inertias lead to accelerations, because these inertias tend togre'du'ce, the accuracy of the con- "trol and because stopping and startingof the transport rollers results in vibration generatedinthe apparatus.

It is also known in copying to feed the stacked paper by the feed roller'to a stationary pair of transport rollers, to form the paper into a loop at this is pairof rollers and then to start the transport rollers at a suitable moment. This results not only in the disadvantages mentioned above in controlling the standstill and rotation of this pair of rollers, but in addition thereto, the leading edge of the paper does not make contact with the zone of contact between the stationary pair of drawing in rol- In a preferred embodiment of the invention, the drawing in roller is associated with a mating roller with a flattened portion, having in the zone of this flattened portion at least one stop member projecting intoa recess of the drawing in roller. The mating roller may be releasedr from a lockable ratchet which fixes the starting position of the roller by means of a spring-loaded bolt. Thus, the "starting position of the mating roller ismechanically determined, wherein the spring force accelerates the roller during the movement in which it is not in engagement with the other roller, i.e., in which the flattened portion is adjacent thereto, to the point when the periphery makes contact with the drawing in roller, so that an adequate drawing in speed is obtained. This embodiment offers also a functionally favorable arrangemend for the stop which is moved automatically and without any additional controls by the rotation of the mating roller out of-the zone of engagement of the transport mechanism. i

Conveniently, the stop has the form of a plurality of spring leaves, located in peripheral slotsof the mating roller and engaging with bent and polished ends into peripheral grooves of the transport roller.

lers in an accurately-defined manner. The control accuracy is further reduced by the fact' that the starting pair of drawing in rollers must also carry out theiast phase of the feed of the pler than in the device first described, the defect of the accurate pulling in has not thereby been eliminated.

su MARv or Tl-IE lNVENTlON lt is an object of the invention to provide a drawing in apparatus with a more accurate action and with smaller inertia with regard to the acccleratiomsuch that a jerk-free operation is achieved. f

It is a further objectof theinvention to provide an apparatus of the kind above mentioned, in which at least one roller of the transport roller-pair is continuously driven and effects the feed to a defined, disengageable limit stop located in a zone of collaboration with a counter transportation means, comprising a control of this stop'as a function of the release of the feed roller after a predetermineddelay.

The continuous drive of the drawing in roller eliminates on the one hand reactions linked withaccelerating a transportation means, and provides also, a revolving element which moves the leading edge of the "template into the zone of collaboration and against the stop,-whereupon the release of the stop member releases the direct pulling in of the sheet. The delay, the production ofwhich is particularly well solved according to the invention, is such that a loop of sufficient height is produced, which ensures a reliable engagement of the drawing in roller even in the case of substantial slipping losses.

For controlling the feed roller and the drawing in roller arrangement, a special embodimentof the invention provides a dual ratchet stop, comprising two hook rollers of which the first is releasable by the impulse bywhich a locking member is withdrawn from a ratchet of the firsthook roller, wherein the starting movement of the first hook roller engages a clutch coupling for driving the feed roller.'The first hook roller is associated with a cam disc for actuating a second pawl for the second hook roller for releasing the mating roller, wherein a cam of the cam disc is so offset peripherally relative to the ratchet step of the first hook. rollerthat the second hook roller engages the second pawl only after the clutch coupling for the feed roller has been engaged. The detailed construction of the hook roller will be described further below. I

Since the drawing in rollerarid the mating roller run conveniently over a longer travel than the feed roller, the second hook roller is preferably connected via a gearing with the mat ing roller, in order to drive the second hook roller at a fraction of the speed, e.g., at half' the speed, of the first hook roller. Hence, for example, at half the driving speed, the mating roller can, run twice as long as'the feed roller. This is convenient,-because the drawing in and mating rollers effect the transport of the sheet, to a further, continuously revolving transport arrangement, e.g., a pair of transport rollers. There may alsobe provideda transmission between the continuously revolving drawing in roller'and the drive shaft of the second hook roller, e.'g., at the ratio of 1:2, such that the second hook roller revolves at a lowerspeed thanthe drawing in roller and the first hook roller.

In another preferred embodiment, the transport means consists of two contacting, continuously revolving drawing in rollers. Of these rollers, one is a roller composed of disc-shaped sections and the other has correspondingly aligned peripheral slots. The limit stop in the zone of contact of the drawing in rollers is conveniently mountedbetween the sections of the one roller and is so movablethatit can be moved by an impulse out of the zone'of. contact between the tworollers. A cam control, provided for the feed roller and for the stop and causing the delayed actuation of the stop relative to the drive of the feed roller, bodiment also.

Conveniently, the stop arranged between the continuously revolving drawing in rollers consists of a plurality of teeth in comblike arrangement and has the form of a pivoting lever,

wherein the teeth protruding into the contact zone between rotary spindle, wherein this hook iroller element or a part.

firmly connected therewith is associated with a tension spring,

equipped with a hook roller in this emeach hook roller has a disc-shaped member, for example, with the peripheral recess associated with a continuously driven drive roller which may revolve in this peripheral recess, but may make contact with the remainder of the periphery, wherein, after the release of the hook roller, the spring either pulls the axial peripheral recess out of alignment with the drive roller, or forms a driving engagement by pressing the disc-shaped roller section on to the drive roller. This solution makes possible the application of extremely simple control means in a very compact arrangement, but nevertheless operating with the utmost reliability.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be further explained, by way of example, with reference to the accompanying drawings, in which:

FIG. 1 is a diagrammatical side elevation of an apparatus according to the invention, sectionalized along the line I-l in FIG. 2, and with the rear assembly wall omitted for the sake of clarity;

FIG. 2 is a partial top view, corresponding to FIG. 1;

FIG. 3 is a circuit diagram for the apparatus shown in FIGS. 1 and 2;

FIG. 4 is a cross section along the line IV of the mating roller and along the line IVa of the drawing in roller in FIG. 2;

FIG. 5 is an end view, corresponding to FIG. 2, seen from the right, with parts broken away and in partial representation;

FIG. 6 is a diagrammatical side elevation of another embodiment of the invention, showing the functional associations between the parts;

FIG. 7 is a top view ofa structural unit in FIG. 6; and

FIG. 8 is a diagrammatical side elevation of an apparatus embodyinga drawing in mechanism according to FIG. 6. I

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The apparatus according to FIGS. 1 to 5 is intended for use in a copying device, the basic components of which are shown, by way of example, in FIG. 8 which indicates the exposure and developing sections. The arrangement of the parts of the first embodiment in such a copier will be described at the end of this description. In the arrangement shown in FIGS. 1 and 2, a control mechanism is shown, adjacent to a stack 1, between two assembly walls 2, 3, located in the plane of the drawing. These walls 2, 3 have been omitted in FIG. 1. An end wall 4, and a part of a base plate 5 for the stack or stack holder, are shown in section, the latter being located behind the assembly walls not shown in FIG. 1.

The sheets of the stack, not shown in detail, rest on the base plate; the topmost sheet is indicated at 6. The base plate may be pressed upwardly by a spring, but this is not essential because, particularly with a sloping end wall 4, the sheets can be raised by the feed roller 7.

In front of the end wall of the stack, there is the mating roller 8, having, in the position shown, a flattened portion 9 on the top. The mating roller consists of disc-shaped sections, some of which are shown at l0, l1, 12, mounted nonrotatably on a shaft 13. The construction in disc-shaped sections will be explained further below with reference to FIG. 4, and its object is the provision of a special stop member.

A feed roller 14 is mounted above the mating roller 8. This roller 14 has peripheral slots l5, 16 (FIG. 5) arranged always above the interstices between sections 10, ll, 12 of the mating roller. The roller 14 is mounted nonrotatably and axially undisplaceably on a shaft 17. This shaft I7 passes through the assembly wall 3 and carries on its projecting end 18 a drive pinion l9, driven by a drive motor 85 of a drive unit. This motor 85 can be switched by a main switch and drives the drawing in roller 14 continuously.

The bottom end 20 of the drawing in roller, at the bottom in FIG. 2, has at its end-face a coupling profile, such as a radial toothing for example. 'The other coupling element 21 is arranged on a bush 22 mounted rotatably and axially displaceably on the shaft 17. The fork 24 (FIG. 4) with fingers 25, 26 engages into a peripheral groove 23,, in order to move the bush towards the drawing in roller 14 for engaging the coupling, or to move it away for disengaging the coupling.

A section 27 of the bush 22 forms a pulley with a belt 28 running therein. The ends of the shaft 30 of the feed roller 7 rest on pivotable supporting arms 31, the other ends of which are mounted pivotably concentrically to the shaft 17 of the drawing in roller, for example, in special parts 32 located rotatably in a restriction 33 of the drawing in roller 14. A corresponding supporting arrangement is also on the other end of the feed roller shaft 7, not shown.

The shaft 17 carries a fixed gear 34, mounted for example immediately behind the mounting wall 3; this gear 34 is connected through two idlers 35 and 35a, which are mounted by means of stub shafts 40 and 400 on the wall 3, to another gear 36. This latter gear is mounted firmly on a bush 37 which is arranged rotatably on a shaft 38 between the assembly walls 2 and 3. The bush 37 which is axially fixed on the shaft 38, also carries a drive roller or disc 39, made for example of a synthetic resin, such as Vulkalan, or hard rubber, or the like. Preferably, this disc has the same diameter as the gears 34, 36 and the drawing in roller 14, to explain a certain speed or transmission ratio.

A spindle 41 is mounted between the assembly walls, and carries a freely rotatable, but axially fixed, hook roller 42. The hook roller 42 has a radial ratchet step 43, located on the top in the position shown in FIG. 1. One side of the hook roller is provided with a cam disc 44 with a peripheral cam 45, offset relative to the ratchet step 43 through about 270, as viewed in the direction of rotation, as shown in FIG. 1. This cam disc has, for example, an axial pin 46, affected by a spring 47', whose other end is mounted on'a pin 48 fitted to the assembly wall 3.

On the other side of the hook roller 42, there is a discshaped roller section 49 with a peripheral recess 50 (FIG. 1) in which the drive roller or disc 39 can revolve without contact, when it is faced by this recess. If therefore, the hook roller 42 with the'disc-shaped roller section 49 is rotated, the periphery of this disc-shaped section makes positive contact with the drive roller and the hook roller is carried along.

The disc-shaped roller section 49 carries further a cam member 51 with an axial cam profile. As may be seen, a radial cam member 52 is substantially aligned with the ratchet step 43, possibly in the sense opposite to the rotation of the hook roller 42, as indicated in FIG. 1, and somewhat offset, so that an adjacent coupling actuating lever 53 is urged by a spring at the start of the rotation of the hook roller 42 along this step inwardly, or, as in FIG. 2 downwardly.

A locking pawl 55 is arranged to pivot about a pivot member 54 arranged on the wall 2. In the position shown, one end of this pawl 55 engages into the ratchet step 43 and prevents the spring 47 from rotating the hook roller. The other end 57 is articulately mounted on the armature 58 of an actuating magnet 59, mounted on the assembly walls. This armature carries a spring 60, urging the actuating magnet towards the outside (i.e., towards the top in FIG. 1), giving rise to the engaged position of the locking pawl 55. Energization of the magnet 59 causes the end 56 to be lifted out of the ratchet so that the spring 47 connects the drive for the hook roller. Obviously, the term hook roller is meant to include the torsionally rigid connection of the various parts 42, 44, 49, 51.

A rotary mounting 63 for the coupling actuating lever 53 is located on a base 61 on the assembly wall 2 by means of a bracket 62 (FIG. 5). The pivot is shown at 64. The lever 53 carries also a laterally directed pin 65 which passes through a hole 66 in the assembly wall 2. Between the assembly wall and the lever 53, there is a compression spring 67 surrounding the pin 65. This spring 67 urges the end 68 of the coupling lever 53, engaging the cams 51, 52, against the axial profile of the cam surface. It may be seen that, when the cam 51 or the hook disc 42 rotate in the direction of the arrow shown in FIG. 1, the spring 67 causes the coupling lever to pivot in an anticlockwise direction, as'viewed in FIG. 2. This movement causes the bush 22 to be shifted along the shaft 17 and the couplings between the parts'20,-21 are engaged.

The further revolution of the hook roller 42 lifts, e.g., after a revolution of 180", the coupling lever 53 along the dotted line cam surface 69 again into the FIG. 2 position, in which the hook roller is positively stopped, because the spring 60 causes the locking pawl to engage into the ratchet 53, when the peripheral recess 50 is located opposite the drive roller 39.

Underneath thepin 40, a further spindle 70 is mounted on the assembly wall 2. It is located at the same level as the shaft 13 of the mating roller. Mounted on this spindle are a gear 71 and nonrotatably adjacent thereto a further hook roller 72. This second hookroller 72 has a ratchet step 73 (on top in FlG.l), for a locking pawl-74. This locking pawl is a pivoting lever adapted to pivot, about a spindle 75 between the assembly walls 2 and 3. The end remote from the acting end cooperating with the ratchet step 73 and shown at 76 extends underneath the cam disc 44. A compression spring 78,'arranged on the bottom of the'assembly on a socket 77, tends to urge the second pawl 74 against the cam disc 44 with the cam 45, and also into the ratchet step 73. When the cam 45 cooperates with the locking pawl 74, the remote end is lifted off the ratchet step 73 and the hook roller 72 with the gear 71 is released.

A pinion 79, firmly mounted on the shaft 13 of the mating roller, meshes with the'pinion 71. Furthermore, the end face of the mating roller 8, visible in FIG. 1, has arranged thereon an axialpin-Sfl witha tension spring 81. Its other end is mounted on a pin 82 on the outside'of the assembly wall 2.

'When'the second locking pawl 74 is disengaged, the mating ing roller 8 so that the peripheral sections outside the flat 9 can engage the drawing in roller 14 and this continuously driven roller 14 entrains the mating roller 8.

Since the gear 71, has twice the diameterofthe pinion 79, the mating roller 8 makes two revolt revolutions for every revolution of the hook roller 72. Hence, the locking pawl 74 can engage into the ratchet step 73 only after the mating roller 8 has made two revolutions. More revolutions could be achieved by choosing another transmission ratio. This is important in order to effect a further running of the mating roller 8, Le. of the whole drawing in device, even in the case that the feed rolle'r has stopped after a single revolution of the hook roller 42. It should be mentioned thatin this case during the passage of the fiat 9 along the' drawing in roller 14 the spring 81 maintains themovement of the mating roller, while the stops, described further below, ensure the contact pressure between a sheet and the drawing in roller.

FIG. 3 is a simple circuit diagram for this arrangement. A motor 85 may be connected by a mains switch 84 to a power source 83 and drives, for example, the pinion 19 in FIG. 2. In

addition, a circuit 86 contains the switch group 87 shown in FIGS. 1 and 3. The actuating magnet 59 is connected in series with this group.

It may therefore be seen that the parts connected to the roller 17 are continuously driven but that a passage of paper moving in the direction of the arrows 183, 184 in FIGS. 1 and 3, first closes the left contact ofthc switch 87 and then opens the right contract of this switch so that .the actuating magnet 29 receives an impulse for releasing the hook roller 42. Then the sequence continues as already described.

FIG. 4 shows at the top, where the bush 22 is out along the line We, the peripheral groove 23 into which engages the forked end 24 of the lever 53. The dotted line 88 indicates the bottom of circumferential slots 15, 16 in the feed roller 14.

In FIG. 4 the mating roller .8-is sectionalized along the line IV in FIG. 2 and a slot shaped space may be seen between the sections and 11.-This interspace carries, as do all other interspaces, a mountingpin 89 for a bent leaf spring'90. This spring passes outwardly around an abutment 91 extending through the interspace and inwardly around a higher abutment 92. The end of the spring extending from thespace reaches into the circumferential slot 15 and has therein a bent portion 93.

In the rest position the paper runs into .the gap between the mating roller 8 and the feed roller 14. It is retained by the leaf springs 90. After the starting, the mating roller revolves and the end 93 of the leaf spring is moved out of contact between the feed roller and the mating roller. After one revolution, the

bent end 93 of the leaf spring may rest on the underside of the paper with the leaf spring deflected-about the abutment 91. Preferably the upper side of the bent end is polished to reduce friction. v

These leaf springs arranged in a row across the width of the stack form'the so-called defiectable stop.

FIG. 5 is an end side viewof FIG. 1,"viewed from the right and with some parts broken away. More particularly, the bush 22 and the feed roller 14 are broken off in the zone of the coupling 20, 21. The section 27 of the bush, forming a pulley, may again be seen. FIG. 5 also shows the leaf spring 90 between the sections 10, 11- of the mating roller 8 and similar leaf springs in adjacent interspaces. I

FIGS. 6 to 8 show diagrammatically a modified embodiment wherein the arrangement'is mounted in a copier. Similar to the feed roller 7 in FIG. 1, a feed roller 121 is arranged above a stack and supported by arms 122 on a shaft 123. The bearing bush 124 is freely rotatable on the arms 123, permitting the roller 121 to follow the reducing height of the stack.

Drive pulleys 125 are mounted on the shaft 123, of which one is driven by a cable drive 126 and the other connected by a cable drive 127 with a drive pulley on the feed roller.

Rollers 128, 129 are mounted at a small distance in front of the stack 120 in a frame which may have, for example, two walls parallel to the plane of the drawing. Also the shaft 123 is mounted in the frame. The rollers 128, 129 are connected with the main drive and revolve, in contact with each other, I

continuously in the direction of the arrows except when the apparatus is switched off. v

The lower roller 129 consists of roller sections mounted on the shaft 130, as explained for the roller 8 in FIG. 1. The cross section in .FIG. 6 shows the shaft 130 in the zone of an interspace between two roller sections of the roller 129. In this zone, the roller 128 has a circumferential slot 131.

Mounted on the shaft 130 in at least two interspaces in the roller 129 are arms 132 with hearing recesses 133 enabling the arms to be rotated about the shaft130. Each arm has a projection 134 extending in the position of the drawing into the slot 131 of the roller. 128. The adjustment is such that the edge of the projection 134 facing the stack 120 is infront of the zone of contact of the rollers, such that a paper abutting the projection is not yet forcibly gripped by the rollers 128, 129.

The free ends of the arms 132 are connected by a bar 135 extending parallel to the rolleraxes so that several arms 132 are provided after a manner of a comb and form the stop. The bar is supported on an abutment 136 and is urged against-the same by a spring 137 whose other end is anchored in the frame.

The abutment 136 is hinged at 138 to a two-armed lever 139 which may be pivoted about a pivot 140 fitted in the frame parallel to the shaft 130. The other end of the lever forms a cam follower 141 running on the periphery of a profiled cam disc 142 of an arrangement shown in detail in FIG. 7. The lever 139 is held against the cam by a spring 139a mounted in the frame.

Adjacent to the disc arrangement the cam disc has a hook disc 143 with a radial ratchet step 144; adjacent to this hook disc is a drive pulley 145 with a peripheral recess 146. This recess 146 may also extend through the hook disc. On the side remote from the hook disc is a pulley 147 with cable 126 running thereover. The parts 142, 143, 145, 147, are rigidly interconnected and so mounted on a shaft 148 as to be rotatable in the frame. This frame contains also the drive roller, 149, driven continuously bya motor 150 which can also drive, for

example, the shaft 129 by means of a transmission 151 indicated by chain dotted lines.

When a locking pawl 152, mounted pivotably about a pin 153 in the frame, engages into the ratchet step the peripheral recess 146 is in alignment to the drive roller 149. When the pawl 152 is disengaged against the force of a frame mounted spring 156 by an impulse applied to the actuating magnet 154 whose armature is hinged at 155 to the locking pawl 152, a spring 157 pulls the recess 146 out of alignment to the roller 149. In this way the roller may perform the drive of the hook disc 143 and of the pulley 147, as well as of the hook disc 142, until the pawl 152 engages again into the ratchet 144. The spring 157 is mounted with one end on a pin 158 of the disc arrangement, for example the cam disc 142, and with the other end on an abutment 159 in the frame.

The cam disc 142 has a spiralshaped cam with a step 160. When, with rotation in the direction of the arrow, the cam rider 141 drops at the step 160, the bar 135 is lifted by the lever 139 and the projections 134 are pivoted out of the zone between the rollers, namely to the left in FIG. 6.

When the apparatus is switched on, the feed roller 121 transports a top sheet 161 to the rollers 128, 129. Owing to their continuous revolution the leading edge of this sheet is taken along to the zone of mutual contact, being guided first to the projections 134 forming the stop. Here the leading edge is stopped and the sheet loops up as described. Since the feed roller 121 is driven through the pulley 147, this process had been initiated by an impulse of the actuating magnet 154. At the same time the cam disc 142 starts to revolve. The step 160 is so offset circumferenti'ally relative to the peripheral recess 146 that it reaches the position under the cam rider 141 when the sheet 161 has the position shown, so that the projections 134 are pivoted in a clockwise direction out of the contact zone of the rollers 128, 129 and the leading edge of the sheet 161 is immediately gripped.

FIG. 8 shows the installation of a FIG. 6 arrangement into a copying apparatus. Parts corresponding to those in FIG. 6 are designated by the same reference numerals. Only for the motor 150 a different arrangement 150' has been chosen in FIG. 8.

The outer line 162 indicates the housing walls, in the upper wall 163 of which is a transparent plate 164 for an original which passes through a frame 165 not described in detail. For illuminating the contact surface 164, lamps 166, 167 are provided. The image beam v168 is projected by a mirror 169 through an optical arrangement 170 on to a transparent reproducing surface 171 along which the copying material is guided by contact pressure means not shown in detail. This may be, for example, the sheet 161. It is transported by the rollers 128, 129 through a charging device 172, to a pair of rollers 173, the distance between the latter and the rollers 128, 129 being smaller than the length of the sheet. This arrangement shows a further advantage of the continuously revolving rollers 128, 129, in that hitherto necessary transport means, in front of a charging device or behind a drawing in device adjacent to the stack, are no longer necessary, because their duty is performed by the continuously revolving rollers 128, 129.

Under the reproducing surface 171 a further pair of transport rollers 174 guides the copying paper through a developer arranged at 175. Downstream thereof are transport and squeeze rollers 176 carrying the paper into a drying chamber 177 with a thermal radiator 178, from where the paper leaves through a delivery slot 179.

The actuating magnet 154 receives the trigger impulse by a pair of impulse switches 180 arranged in the path of the original in front of position 164 as known in the art.

FIG. 8 shows the transmission connected to the motor 150' as a cable drive 181. This transmission is shown in FIG. 6 by chain dotted lines 151.

In order to explain the arrangement of the embodiment of FIGS. 1 to in a copier with the parts of FIG. 8, it should be mentioned that the following elements correspond to each other giving first the reference numerals used in FIGS. 6 to 8 and then the reference numerals for the corresponding parts as used in FIGS. 1 to 5: Stack 120, 1'; feed roller 121, 7; drive motor 150, roller shaped drive pulley 149, 39 with circumferential recess 146, 50; drive roller 145, 49; spring 157, 47; hook disc 143, 42; actuating magnet 154, 49.

The pair of rollers 128, 129 inFIG. 8 corresponds to differently constructed rollers 14, 8 in FIG. 1, while the cam disc 142 in FIGS. 7 and 8 corresponds to the cam disc 49 in FIG. 1. In the same way as the magnet 59 is energized through the switch 87, the magnet 159 is energized through the switch for issuing an impulse as a function of the presence of an original.

Iclaim: H

1. In copying apparatus, an improved device for drawing format sheets into a processing arrangement at one point in synchronism with an original sheet, to be copied, guided into the processing arrangement at another point, said device comprising, in combination, switch means in the path of movement of the original sheet and operable thereby; means supporting a stack of format sheets; a feed roller engaging the uppermost format sheet of the stack; format sheet transport means, including a drawing in roller a nd a mating roller cooperable with said drawing in roller, positioned downstream of said stack supporting means in the path of movement of a format sheet toward the processing arrangement; driving means continuously rotating at least one of the rollers of said transport means in a direction to draw a format sheet into said transport means; clutch means including a driving member rotatable by said driving means and a driven member in driving connection with said feed roller; stop means operatively associated with said transport means and normally positioned in the path of movement of a format sheet to block entry of the leading edge of a format sheet into said transport means; pawl means cooperable with said driven member and normally blocking coupling of said driven member to said driving member; release means operable, responsive to operation of said switch means by an original sheet, to release said pawl means; coupling means connected to said driven member and operable, responsive to release of said pawl means, to couple said driven member to said driving member to rotate said feed roller to feed a format sheet from the stack into engagement with said stop means; cam means rotatable with said driven member; and means connected to said stop means, and including cam follower means engageable with said cam means, operable, after a predetermined rotation of said feed roller to retract said stop means for entry of the format sheet into said transport means for engagement between the rollers of the latter.

2. In copying apparatus, an improved device, as claimed in claim 1, in which said drawing in roller is formed with at least one circumferential groove in its periphery; said mating roller having a flattened portion included in its periphery; said stop means including at least one stop on said mating roller in the zone of said flattened portion and projecting into said circumferential recess; said release means comprising a solenoid controlled by said switch means and controlling said pawl means; said means connected to said stop means including said mating roller, gear means in driving connection with said mating roller, ratchet means included in said gear means, and a pawl constituted by said cam follower means and engaged with a ratchet stop on said ratchet means when said mating roller is positioned with its flattened peripheral portion opposite said drawing in roller so that said mating roller is disengaged from said drawing in roller; said means connected to said stop means further including spring means connected to said mating roller and operable, responsive to disengagement of said pawl from said ratchet stop, to rotate said mating roller to a position in which a circular portion of. its periphery engages the periphery of said drawing in roller for rotation of said mating roller by said drawing in roller; said pawl reengaging said ratchet stop after a number of rotations of a said mating roller in excess of one rotation and when said flattened portion of said mating roller is again aligned with said drawing in roller.

3. In copying apparatus, an improved device, as claimed in claim 2, wherein said stop is in the form of a plurality of leaf springs arranged in respective circumferential slots in said mating roller, said leaf springs having bent free ends extending into respective circumferential grooves in said drawing in roller when said flattened portion of said mating roller is aligned with said drawing in roller.

4. In copying apparatus, improved device, as claimed in claim 2, in which said gear means comprises a first hook roller constituting said driven member, a second hook roller constituting said ratchet, and a pivoted link operable by said solenoid in having an end engaged with a stop on said first hook roller; said cam means comprising a control cam rotatable with said first hook roller; a normally disengaged coupling operable to connect said feed roller to said driving means; a clutch operating member operable by said control cam, responsive to coupling of said first hook roller to said driving member, to engage said coupling; said cam means further including a cam disc rotatable with said first book roller and having a switching cam; spring means biasing said pawl into engagement with said cam disc for normally maintaining an end of said pawl engaged with said ratchet stop on said ratchet; said switching cam swinging said pawl to disengage said ratchet stop; said second hook roller being in positive driving engagement with said mating roller; the ratchet stops on said first and second hook rollers being offset relative to each other to an extent such that said second hook roller is released by said pawl for rotation of said mating roller only after said coupling for said feed roller is engaged.

5. In copying apparatus, an improved device, as claimed in claim 4, including reduction gearing interconnecting said second hook roller and said mating roller and rotating said second hook roller at one-half the speed of said mating roller.

6. In copying apparatus, an improved device, as claimed in claim 4, in which said coupling for said feed roller is an axial coupling including an axially movable coupling member; a pivoted coupling member operating lever engaged with said axially movable coupling member; said cam means including an axially profiled cam rotatable with said first hook roller; and spring means biasing said pivoted lever into engagement with said axially profiled cam or operation by the latter.

7. In copying apparatus, an improved device, as claimed in claim 1, in which both rollers of said transport means are continuously rotated in contact with each other; said mating role roller being constructed of axially spaced disc-shaped sections; said drawing roller being formed with circumferentially extending slots each aligned with an interspace between two disc-shaped sections; said stop means comprising a stop positioned in the zone of contact between said drawing in roller and said mating roller; and means movably mounting said stop for retraction out of said zone of contact subsequent to initiation of rotation of said feed roller.

8. In copying apparatus, an improved device, as claimed in claim 7, wherein said stop comprises a plurality of comblike teeth on an=end of a pivoted lever, said comblike teeth being retractable from said zone of contact by pivoting of said pivoted lever in the direction of movement of a format sheet along said path of movement; said means connected to said stop means comprising a hook roller, constituted by said driven member, a locking pawl included in said pawl means and cooperable with a ratchet stop on said hook roller, a cam disc rotatable with said hook roller, and a linkage engaged with said cam disc and connected to said pivoted lever carrying said comblike teeth.

9. In copying apparatus, an improved device, as claimed in claim 8, wherein each of said comblike teeth is formed with a U-shaped bearing recess; said mating roller being formed, between said disc-shaped sections, with circumferential grooves engageable by said bearing recesses; and spring means connected to said comblike teeth and biasing the same to pivot about the axis of said mating roller toward said linkage 10. In copying apparatus, an improved device, as claimed in claim 1, in which said driving member is peripherally engageable with said driven member; said driven member having an arcuate recess in its periphery concentric with the axis of said driving member and having a radius in excess of that of said driving member, whereby said driving member is freely rotatable in said recess-without engaging said driven member; said coupling means comprising a spring connected to said driven member and biasing said driven member to rotate in a direction to engage its periphery with a periphery of said driving member; said pawl means being cooperable with the ratchet stop on said driven member and arresting said driven member in a position in which said peripheral recess is aligned with said driving member.

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