CA2054135A1 - Device for conveying and aligning paper sheets at a feed table of a printing machine comprising a single-sheet feeder - Google Patents
Device for conveying and aligning paper sheets at a feed table of a printing machine comprising a single-sheet feederInfo
- Publication number
- CA2054135A1 CA2054135A1 CA002054135A CA2054135A CA2054135A1 CA 2054135 A1 CA2054135 A1 CA 2054135A1 CA 002054135 A CA002054135 A CA 002054135A CA 2054135 A CA2054135 A CA 2054135A CA 2054135 A1 CA2054135 A1 CA 2054135A1
- Authority
- CA
- Canada
- Prior art keywords
- shaft
- feed
- aligning
- lever
- conveying
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41F—PRINTING MACHINES OR PRESSES
- B41F21/00—Devices for conveying sheets through printing apparatus or machines
- B41F21/14—Adjusting lateral edges, e.g. side stops
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H9/00—Registering, e.g. orientating, articles; Devices therefor
- B65H9/10—Pusher and like movable registers; Pusher or gripper devices which move articles into registered position
- B65H9/103—Pusher and like movable registers; Pusher or gripper devices which move articles into registered position acting by friction or suction on the article for pushing or pulling it into registered position, e.g. against a stop
Abstract
ABSTRACT OF THE DISCLOSURE
The invention relates to a device for conveying and aligning paper sheets at the feed table of a printing machine comprising a single-sheet feeder, an aligning section and a rotating conveyor roller for conveying said sheets. Preferably, an aligning arrangement is provided in the aligning section and mounted above the feed table so as to be adjustable in its lateral position and being easily convertible from the one side to the other so that the sheet to be aligned may be alternately aligned at the one edge or the other.
The invention relates to a device for conveying and aligning paper sheets at the feed table of a printing machine comprising a single-sheet feeder, an aligning section and a rotating conveyor roller for conveying said sheets. Preferably, an aligning arrangement is provided in the aligning section and mounted above the feed table so as to be adjustable in its lateral position and being easily convertible from the one side to the other so that the sheet to be aligned may be alternately aligned at the one edge or the other.
Description
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TITLE: DEVICE FOR CONVEYING AND ALIGNING PAPER
SHEETS AT A FEED TABLE OF A PRINTING
MACHINE COMPRISI~G A SINGLE-SHEET FEEDER
FIELD OF THE INVENTION
The invention relates to a device for conveying and aligning paper sheets at the feed table of a printing machine comprising a single-sheet feeder, an aligning section, and conveying means rotating on shafts and conveying the sheets across saicl aligning section to the following feed rollers for feeding the sheets to a gripper bar provided in the impression cylinder.
The invention also relates to a device for conveying and aligning paper sheets at the feed table of a printing machine comprising a single-sheet feeder, an aligning section and a rotating conveyor roller for conveying sheets, an aligning means being provided in said aligning section and being mounted above the feed table so as to be adjustable in its lateral position.
BACKGROUND OF THE INVENTION
The DE-OS 20 58 606 discloses such a device which is a complicated and awkward system of various successive and partly overlapping conveying and aligning means. First of all, the aligning section is provided with rotating conveyor tapes for conveying the paper sheets. Between said tapes suckers which, via racks, are alternately moved forward and backward for conveying and pre-aligning the sheet are provided in a first area of said aligning section. In a second area of said aligning section rotating front lays at which the sheet is aligned with its leading edge are secured on chains and located parallel to the rotating conveyor tapes. Moreover, awkwardly operating lateral aligning means performing the final lateral alignment are located in said second aligning area. Driven brushes disposed above the feed table convey the sheet obliquely forward towards the lateral aligning limitations ~ ~3 which consist of the -tape surfaces of further rotating tapes which are driven and laterally tilted. As a whole, such a device is extremely complicated and awkward with respect to its setup and its drive control unit. Said device comprises a plurality of interlocking conveying and/or aligning means (i.e. suckers, conveyor tapes, front lays, brushes, lateral alignlng limitations, all running in a different manner) which have to be driven separately in accordance with the machine cycle. In order to perform format adjustments further complicated measures have to be taken. The guide means for the sucker mo-tion, the brushes and the rotating lateral aligning limitations must be laterally displaceable, some of the front lays must be designed so as to be able to swing away due to the little space available, and the conveyor tapes must differ in length. The drive means for the sucker motion, the brushes, the rotating lateral aligning limitations must be adapted to the adjustability. Consequently, satisfactory format adjustments require enormous construction work and are very time-consuming for the machine operator, not taking into account the fact that such a device is not designed for the use of different sheet sizes. Even when the sheets are transported by the feed rollers which are arranged downstream of the aligning section, the end portion of the sheet is still subjected to the force and the transport effects of the conveyor tapes acting upward from below, of the brushes acting downward from above, of the brushes acting outward from inside, of the rotating lateral aligning limitations acting inward from outside, and in combination, all acting forward from behind. In order to enable the feed rollers to grip a sheet, even given the smallest format size possible with this construction, these conveying means are, of course, accumulated close to the feed rollers. However, this means that longer sheets are subjected with their end portions to these additional force and transport effects for a relatively long period of time after having been taken over 2 ~ 3 ~
by the feed rollers at their leading sheet edges. The sheets may be damaged or misaligned. As a result thereof, such a device does not ensure a reliable and exact transport and alignment after having changed the sheet size.
Furthermore, it is often necessary, in practice, to print paper sheets on both sides without specific perfecting machines being available in the print shops for this purpose. In such cases, the pressman turns by 180 the sheet pile containing sheets which have already been printed on one side thereof and feeds said sheets a second time to the feeder of the printing machine. However, in order to apply the second print precisely in-register, it is advantageous to align each sheet at -the same edge which was used aligning said sheet for the first print.
SUMMARY OF THE INVFNTION
It is possible with the present invention to design a device according to the generic part of the main claim so as to optimize an exact and reliable transport and alignment of the sheet.
According to the invention, this object is achieved as described by the features of the characterizing part of the main claim.
The conveying means frictionally gripping the sheet from below is laterally displaced towards the lateral aligning limitation the moment it reaches the leading sheet edge. In so doing, the sheet is laterally aligned at the aligning limitations. The momen-t the sheet reaches the feed rollers, the conveying means is entirely lowered below the table plate where it is laterally moved back into its original position. The sheet is now transported by the feed rollers away from the radius of action of the conveying means. For conveying the following sheet, said conveying means is lifted again upwards into its original position for conveying the following sheet.
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With the device for conveying and aligning sheets, according to -the invention, it is merely necessary to drive one single conveying means and to change its position with respect to the sheet transport across the aligning section up to the feed rollers and with respect to its lateral alignment. All driving and displacing means used may extend from below the feed table up to the conveying means, which results in a compact construction of the drive device. Format changes do not require specific adjustments of the conveying and aligning means; it is merely necessary to laterally adjust the lateral aligning limitation by adjusting the feed plate. Since, once the sheet is transported by the Eeed rollers, the conveying means is lowered below the table and thus the sheet is only subjected to the transport effect of the feed rollers and the sheet slides across the table along the lateral limitation with its trailing portion pointing towards the feed rollers, it is also possible to continuously convey formats which are longer than the machine-related minimum sheet size and to ensure lateral sheet alignment as well as a reliable and exact sheet feed, even given a short feed table.
Freely rotatable balls resting on the rotating conveying means during the sheet conveying and lateral aligning by the rotating conveying means reinforces the frictional contact between sheet and rotating conveying means, which guarantees an exact and reliable transport and lateral alignment of the sheets, above all in view of greater conveying speeds.
If the rotating conveying means consists only of a driven shaft having conveyor rollers secured coaxially thereon, this permits a simple and compact construction of conveying means and feed table, drive and control of the conveying means, thus ensuring a particularly reliable transport and alignment, even given especially short feed tables and paper sheets having varying sheet sizes.
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Furthermore, mounting the shafts in levers which are provided at the outer sides of the table and vertically pivoted in accordance with the machine cycle is also beneficial to a compact setup and an exact and reliable pivoting upward and downward owing to a simple design of the bearing.
If, with such a shaft, also drive means as well as lateral displacement means act on an extension of the shaft from outside, this means that it is possible to prevent, to a large extent, the drive means and the displacing means from acting on the space between the side frames of the feed table. The drive means and the displacing means may be neatly provided outside the side frames in a compact manner without taking up the little space available between the side frames. Such a neat and compact arrangement permits a feed table, which is easy to operate, as well as the use of precisely working drive mechanisms.
The features contained in Claim 6 represent a preferred and particularly advantageous embodiment of simple and reliable lateral displacement means which ensure an extremely simple and reliable alignment.
The features of Claim 7 relate to an embodiment of a drive for the conveying means, which is particularly advantageous in view of design and operational reliability, the lateral displacing drive and the pivoting upward and downward of the lever. The control of the axial cam disk and the radial cam disk is concentrated on one driven control shaft.
Owing to the feature of Claim 8, all control means may be gathered in a compact manner on one single feed-table side.
The feature of Claim 11 includes particularly advantageous, space-saving and easy-to-operate drive means permitting a particularly reliable drive.
Lateral aligning limitations in form of feed plates which are laterally adjustable with respect to their lateral position and which are out-of-contact with the . .~ .
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rotating conveying means permit a particularly simple format adjustment. Even given a short feed table, the sheet may be laterally brought, by means of the conveying means, into abutting relation with the aligning edges provided in front of and behind said conveying means and be precisely aligned at the interrupted edges as it were one long edge. Such an aligning limitation is adjustable with respect to the entire format range and is restricted neither by the conveying means wi-th its drive nor by the drive nor by the control means for la-teral alignment.
A preferred specimen embodiment of the lateral aligning limitation is described by the feature of Claim 9.
The developmen-t of the feed plate, the extension of which is used as lay edges, is easy to design, precisely adjustable, easy to replace, easy to operate and to maintain, thus also serving the purpose of exact sheet alignment.
In an especially favourable additional development, front lays rotating over the region of the rotating conveying means complete the entire reliable and exact conveying and aligning process which is effected along the side edge and additionally at the leading sheet edge, said front lays having a rear point of reversal in the region of the feed rollers, seen in conveying direction, and being driven by a drive shaft in a respective point of reversal, via a gear train, a drive connection existing between the printing unit and the drive shaft. The rotating front lays, the speed of which is somewhat lower than the speed of the conveyed sheet, favour a continuous and exact aligning of the sheet at its leading edge, even given great conveying speeds.
It is also possible wi-th the present invention to easily convert, in a printing and perfecting machine comprising double feeding of the sheet pile, the lateral sheet-aligning means from the one side to the other fxee of play and with little effort.
TITLE: DEVICE FOR CONVEYING AND ALIGNING PAPER
SHEETS AT A FEED TABLE OF A PRINTING
MACHINE COMPRISI~G A SINGLE-SHEET FEEDER
FIELD OF THE INVENTION
The invention relates to a device for conveying and aligning paper sheets at the feed table of a printing machine comprising a single-sheet feeder, an aligning section, and conveying means rotating on shafts and conveying the sheets across saicl aligning section to the following feed rollers for feeding the sheets to a gripper bar provided in the impression cylinder.
The invention also relates to a device for conveying and aligning paper sheets at the feed table of a printing machine comprising a single-sheet feeder, an aligning section and a rotating conveyor roller for conveying sheets, an aligning means being provided in said aligning section and being mounted above the feed table so as to be adjustable in its lateral position.
BACKGROUND OF THE INVENTION
The DE-OS 20 58 606 discloses such a device which is a complicated and awkward system of various successive and partly overlapping conveying and aligning means. First of all, the aligning section is provided with rotating conveyor tapes for conveying the paper sheets. Between said tapes suckers which, via racks, are alternately moved forward and backward for conveying and pre-aligning the sheet are provided in a first area of said aligning section. In a second area of said aligning section rotating front lays at which the sheet is aligned with its leading edge are secured on chains and located parallel to the rotating conveyor tapes. Moreover, awkwardly operating lateral aligning means performing the final lateral alignment are located in said second aligning area. Driven brushes disposed above the feed table convey the sheet obliquely forward towards the lateral aligning limitations ~ ~3 which consist of the -tape surfaces of further rotating tapes which are driven and laterally tilted. As a whole, such a device is extremely complicated and awkward with respect to its setup and its drive control unit. Said device comprises a plurality of interlocking conveying and/or aligning means (i.e. suckers, conveyor tapes, front lays, brushes, lateral alignlng limitations, all running in a different manner) which have to be driven separately in accordance with the machine cycle. In order to perform format adjustments further complicated measures have to be taken. The guide means for the sucker mo-tion, the brushes and the rotating lateral aligning limitations must be laterally displaceable, some of the front lays must be designed so as to be able to swing away due to the little space available, and the conveyor tapes must differ in length. The drive means for the sucker motion, the brushes, the rotating lateral aligning limitations must be adapted to the adjustability. Consequently, satisfactory format adjustments require enormous construction work and are very time-consuming for the machine operator, not taking into account the fact that such a device is not designed for the use of different sheet sizes. Even when the sheets are transported by the feed rollers which are arranged downstream of the aligning section, the end portion of the sheet is still subjected to the force and the transport effects of the conveyor tapes acting upward from below, of the brushes acting downward from above, of the brushes acting outward from inside, of the rotating lateral aligning limitations acting inward from outside, and in combination, all acting forward from behind. In order to enable the feed rollers to grip a sheet, even given the smallest format size possible with this construction, these conveying means are, of course, accumulated close to the feed rollers. However, this means that longer sheets are subjected with their end portions to these additional force and transport effects for a relatively long period of time after having been taken over 2 ~ 3 ~
by the feed rollers at their leading sheet edges. The sheets may be damaged or misaligned. As a result thereof, such a device does not ensure a reliable and exact transport and alignment after having changed the sheet size.
Furthermore, it is often necessary, in practice, to print paper sheets on both sides without specific perfecting machines being available in the print shops for this purpose. In such cases, the pressman turns by 180 the sheet pile containing sheets which have already been printed on one side thereof and feeds said sheets a second time to the feeder of the printing machine. However, in order to apply the second print precisely in-register, it is advantageous to align each sheet at -the same edge which was used aligning said sheet for the first print.
SUMMARY OF THE INVFNTION
It is possible with the present invention to design a device according to the generic part of the main claim so as to optimize an exact and reliable transport and alignment of the sheet.
According to the invention, this object is achieved as described by the features of the characterizing part of the main claim.
The conveying means frictionally gripping the sheet from below is laterally displaced towards the lateral aligning limitation the moment it reaches the leading sheet edge. In so doing, the sheet is laterally aligned at the aligning limitations. The momen-t the sheet reaches the feed rollers, the conveying means is entirely lowered below the table plate where it is laterally moved back into its original position. The sheet is now transported by the feed rollers away from the radius of action of the conveying means. For conveying the following sheet, said conveying means is lifted again upwards into its original position for conveying the following sheet.
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With the device for conveying and aligning sheets, according to -the invention, it is merely necessary to drive one single conveying means and to change its position with respect to the sheet transport across the aligning section up to the feed rollers and with respect to its lateral alignment. All driving and displacing means used may extend from below the feed table up to the conveying means, which results in a compact construction of the drive device. Format changes do not require specific adjustments of the conveying and aligning means; it is merely necessary to laterally adjust the lateral aligning limitation by adjusting the feed plate. Since, once the sheet is transported by the Eeed rollers, the conveying means is lowered below the table and thus the sheet is only subjected to the transport effect of the feed rollers and the sheet slides across the table along the lateral limitation with its trailing portion pointing towards the feed rollers, it is also possible to continuously convey formats which are longer than the machine-related minimum sheet size and to ensure lateral sheet alignment as well as a reliable and exact sheet feed, even given a short feed table.
Freely rotatable balls resting on the rotating conveying means during the sheet conveying and lateral aligning by the rotating conveying means reinforces the frictional contact between sheet and rotating conveying means, which guarantees an exact and reliable transport and lateral alignment of the sheets, above all in view of greater conveying speeds.
If the rotating conveying means consists only of a driven shaft having conveyor rollers secured coaxially thereon, this permits a simple and compact construction of conveying means and feed table, drive and control of the conveying means, thus ensuring a particularly reliable transport and alignment, even given especially short feed tables and paper sheets having varying sheet sizes.
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Furthermore, mounting the shafts in levers which are provided at the outer sides of the table and vertically pivoted in accordance with the machine cycle is also beneficial to a compact setup and an exact and reliable pivoting upward and downward owing to a simple design of the bearing.
If, with such a shaft, also drive means as well as lateral displacement means act on an extension of the shaft from outside, this means that it is possible to prevent, to a large extent, the drive means and the displacing means from acting on the space between the side frames of the feed table. The drive means and the displacing means may be neatly provided outside the side frames in a compact manner without taking up the little space available between the side frames. Such a neat and compact arrangement permits a feed table, which is easy to operate, as well as the use of precisely working drive mechanisms.
The features contained in Claim 6 represent a preferred and particularly advantageous embodiment of simple and reliable lateral displacement means which ensure an extremely simple and reliable alignment.
The features of Claim 7 relate to an embodiment of a drive for the conveying means, which is particularly advantageous in view of design and operational reliability, the lateral displacing drive and the pivoting upward and downward of the lever. The control of the axial cam disk and the radial cam disk is concentrated on one driven control shaft.
Owing to the feature of Claim 8, all control means may be gathered in a compact manner on one single feed-table side.
The feature of Claim 11 includes particularly advantageous, space-saving and easy-to-operate drive means permitting a particularly reliable drive.
Lateral aligning limitations in form of feed plates which are laterally adjustable with respect to their lateral position and which are out-of-contact with the . .~ .
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rotating conveying means permit a particularly simple format adjustment. Even given a short feed table, the sheet may be laterally brought, by means of the conveying means, into abutting relation with the aligning edges provided in front of and behind said conveying means and be precisely aligned at the interrupted edges as it were one long edge. Such an aligning limitation is adjustable with respect to the entire format range and is restricted neither by the conveying means wi-th its drive nor by the drive nor by the control means for la-teral alignment.
A preferred specimen embodiment of the lateral aligning limitation is described by the feature of Claim 9.
The developmen-t of the feed plate, the extension of which is used as lay edges, is easy to design, precisely adjustable, easy to replace, easy to operate and to maintain, thus also serving the purpose of exact sheet alignment.
In an especially favourable additional development, front lays rotating over the region of the rotating conveying means complete the entire reliable and exact conveying and aligning process which is effected along the side edge and additionally at the leading sheet edge, said front lays having a rear point of reversal in the region of the feed rollers, seen in conveying direction, and being driven by a drive shaft in a respective point of reversal, via a gear train, a drive connection existing between the printing unit and the drive shaft. The rotating front lays, the speed of which is somewhat lower than the speed of the conveyed sheet, favour a continuous and exact aligning of the sheet at its leading edge, even given great conveying speeds.
It is also possible wi-th the present invention to easily convert, in a printing and perfecting machine comprising double feeding of the sheet pile, the lateral sheet-aligning means from the one side to the other fxee of play and with little effort.
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According to the invention, feed plates for alternately aligning -the fed sheets are provided on both sides thereof, the sheets to be aligned being moved towards said feed plates by means of a conveyor roller which is driven so as to be axially movable by a double control cam such that the sheets to be aligned are fed by the conveyor roller so as to abut laterally against one feed plate or the other. This solution permits the pressman convert the aligning means provided on the feed table before printing on the second sheet side so that, even given a sheet pile which has been turned over, each sheet is aligned at the same edge in order to achieve an optimum register accuracy, which is especially advantageous if the paper sheets to be processed differ somewhat in size.
In an advantageous embodiment of the invention, a cam roller is assigned to the double control cam; via a double lever, a first control roller and a grooved disk, said cam roller transmits the movement of stroke onto a journal of the conveyor roller; via a connecting rod which carries a further grooved disk, a compression spring transmits the spring force onto a control roller which, via the double lever, presses the cam roller against the one or the other cam of the double control cam; and, via an abutment, the direction of force of the compression spring is reversible with respect to its direction of action.
In a further embodiment, the compression spring is provided on the connecting rod and is limited on both sides thereof by means of a respective retaining ring with respect to its extension; the abutment surrounds said compression spring in longitudinal direction, and said abutment is guided in sliding guidances and is axially displaceable by means of an eccentric pin such that, one one side, said compression is braced against said abutment and, on the other side, it is braced against a retaining ring or vice versa so that the force acts in the one direction or the other. In this embodiment, the feed plates provided on both sides of the sheets to be fed may : :
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be secured on a common tubular traverse which is mounted on the connecting rod and is laterally adjustable via a handwheel having a thread. Owing to this simple solution, converting the lateral sheet alignment from one side to the other may be effected free of play and with little constructional efforts.
BRIEF DESCRIPTION OF THE DRAWINGS
A specimen embodiment of the invention is schematically illustrated in the drawings, wherein:
Figure 1 is a general side elevational drawing of a printing machine comprising a device according to the invention;
Figure 2 is a side elevational view of the device according to the invention;
Figure 3 is a plan view of the device according to the invention;
Figure 4 shows, by way of example, a conveying means having balls resting thereon, according to line 4-4 of Figure 2;
Figure 5 is a cut through device along line 5-5 in Figure 2 comprising driven return pulleys for the front lays;
Figure 6 shows a lateral displacing mechanism;
Figure 7 shows, by way of example, a side elevational view of a control for the feed rollers;
Figure 8 is a fragmentary longitudinal section through the device;
Figure 9 shows a detail of the control system;
Figure 10 is a fragmentary cross-section through the device taken along line 3-3 in Figure 9;
Figure 11 is a fragmentary cross-section through the device taken along line 4-4 in Figure 8;
Figure 12 is a fragmentary longitudinal section through the converting mechanism;
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Figure 13 is a fragmentary cross-section through the converting mechanism taken along line 6-6 in Figure 8;
and Figure 14 is a top view of the converting mechanism.
DETAILED DESCRIPTIQN OF THE PREFERRED EMBODIMENTS
Paper sheets are conveyed from a pile 1 to a printing unit 3 across a feed table 2 of a sheet-fed offset printing machine comprising a single-sheet feeder. In the specimen embodiment, the paper sheets are transported to a conveying and aligning section 5 by means of conveyor tapes 4. Thereafter, the corresponding feed rollers 7, 52 bring the paper sheets into an abutting relation with a gripper bar (not illustrated) provided in the impression cylinder 6. Said impression cylinder 6 is supported in machine side frames 15, 16; the shafts 17 and 53, respectively, of the feed rollers 17 and 52, respectively, are supported in the side frames 11, 12 of the feed table. The rotating conveying means 8 and the rotating front lays 10 are located in the conveying and aligning section 5.
The shaft 18 of the rotating conveying means 8 on which conveyor rollers 19 are secured extends, on both sides thereof, through openings 20 provided in the side 25 frames 11, 12 of the feed table 2 and is mounted in bearings 21, outside of the side frames 11, 12, so as to be rotatable and displaceable. Said bearings 21, in turn, are secured in through bores provided in the levers 13, 14.
The levers 13, 14 are mounted on a shaft 22 in the 30 bearings 23, 24 provided outside the side frames 11, 12, said shaft being rotatably supported in the side frames 11, 12 and being followed by the conveyor rollers, seen in conveying direction. Gearwheels 25, 26 are provided on the outward extended journals of said shaft 22.
On its journal 27 which extends over the right side frame 12 and the bearing 21 provided in the lever 14, the extension of the shaft 18 is provided with a gearwheel 28 ' . .
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and a deep circumferential groove 29 with which the axial displacement roll 30 is in an operatively sliding contact relation.
A broad gearwheel 32 meshing with the gearwheels 26 and 28 is rotatably mounted on a bolt 31 provided at the lever 14.
A control shaft 37 extending - like the shafts 18 and 22 - transversely over the width of the feed table is provided downstream of the conveyor rollers 19, seen in conveying direction, and rotatably mounted below the table plate (which, for the sake of clarity, is not illustrated) in the side frames 11, 12 carrying the table plate. Said control shaft 37 extends through and beyond the two side frames 11, 12 and lies outside the range of action of the lever 14. A gearwheel 38 is secured on its left extension.
A respective radial cam disk 39 is secured at each of the two extensions. And an axial cam disk 40 is attached to the front end of the right extension.
A respective radial sensing roll 41 the circumferential surface of which is brought into contact with the corresponding radial cam disk 39 from below is rotatably mounted on each end 35, 36 of the levers 13, 14, said lever ends being located opposite the rotatable bearing of the shaft 22. In order to maintain this contract relation, a respective spring 42 which is braced against a support 43 attached to the respective outside of the side frames 11, 12 engages the underside of the lever ends 35, 36.
An axial displacement lever 45 having two lever arms 46 and 47 is pivot-mounted in a mounting support 44 which is secured at the outside of the side frame 12 above the common tangent planes of the shafts 37 and 18 and outside the range of action of the lever 14. The ends of the two lever arms 46 and 47 are provided with bolts 48, 49 pointing downward, an axial sensing roll 50 and the axial displacement roll 30, respectively, being rotatably mounted at each lower end of said bolts. Said axial sensing roll 2 ~ 3 ~
is in constant contact with the axial cam contour of the axial cam disk 40. In order to maintain this contact, a spring 51 is braced, between supporting bearings (not illustrated), against the axial displacement lever arm 46 and against the side frame 12 of the feed table.
At the end of the feed table, seen in conveying direction, the feed rollers 52 and 7 are secured on the shafts 53 and S4 extending transversely to the conveying direction and over the width of the feed table 2. The shaft 53 of the feed rollers 52 is rotatably mounted in the side frame 11 below the table plate. The gearwheels 55, 56, 57 are secured on its extension projecting outward through the left side frame. In a known manner, the gearwheel 55 is drivingly connected with the impression cylinder 6, e.g. via a gearwheel 40 and the gear rim 61.
Via intermediate gearwheels 58a and 58b, which are mounted on a bearing bolt rotatably supported at the left side frame 11, the gearwheel 56 meshes with the gearwheel 38.
The gearwheel 57 i3 drivingly connected with the gearwheel 25 of the shaft 22 via a toothed tape 59.
As shown in Figures 2 and 4, a traverse 61 is secured between the side frames 11, 12 over the width of the feed table 2, said traverse having guide bushes 60 which are aligned perpendicularly to the shaft 18 of the conveyor rollers 19 and to the conveying plane. Below the traverse 61 there is secured a retaining metal sheet 62.
Below the round guide bushes 60 the retaining metal sheet is provided with circular through openings 63 the diameter of which is smaller than the diameter of the balls 9 loosely inserted in the guide bushes 60 such that the respective ball segments or cups of the balls 9 project downward through the retaining metal sheet. With the conveyor rollers 19 being pivotted upwards, the balls rest freely on the conveyor rollers or on a sheet of paper, if there is a sheet of paper on said conveyor rollers 19. The moment the conveyor rollers 19 are moved downward, the balls 9 are also lowered until they rest on the rims of the ' . : .
openings 63 provided in the retaining metal sheet 62. The conveyor rollers are lowered below this receiving position.
Depending on the quality of the paper, the format or other individual requirements the balls may be exchanged from above with respect to their number or their quality. The balls 9 may be axially positioned such that they are axially loca-ted above a conveyor roller during the entire lateral displacement. Moreover, it is also conceivable to use other kn~wn ball-res-ting devices, e.g. laterally adjustable guide bushes.
Above, in front of and behind the guide rollers 19, the guiding rods 64, 67 extending transversely over the width of the feed table are fastened to the side frames 11, 12. A mounting support 65 having a metal sheet 68 attached to the side facing the side frame 11 is mounted on the guiding rods 64, 67 so as to be axially displaceable, said mounting support 65 and said metal sheet 68 bridging the ball-resting traverse 61. In front of and behind the conveyor rollers 19, the metal sheet 68 is provided with extensions 66 extending downward below the conveying plane.
These extensions 66 do not contact the conveyor rollers 19 and serve as lateral lay edges. For laterally adjusting the position of the lay edges, the mounting support 65 may be laterally fastened by means of a fixing means 69 with respect to the guiding rod 64.
The device operates as described hereinafter: The shaft 53 is driven, via the gearwheel 55, synchronously and in accordance with the machine cycle, a drive connecting extending from the impression cylinder 6 to said shaft.
The conveyor rollers 19 are driven synchronously via the drive connections 57, 59, 25, 22, 26, 32, 28 and via the gear train 56, 58a, 58b, 38 of the control shaft 37, said control shaft 37 being driven synchronously and in accordance with the machine cycle. In their upper position, the conveyor rollers 19 take over, with the aid of the resting balls 9, the transport of the sheet supplied from the feed pile 1 by the conveyor tapes 4. By pivoting 2 ~ 3 ~
the axial displacement lever 45, the shaft 18, together with the conveyor rollers 19, is laterally displaced towards the lay edges 66; this pivoting motion is achieved by the spring 51 which ensures that the roll 50 runs on the 5 axial cam disk 40. With the aid of the resting balls 9, the sheets are frictionally moved laterally to the edges 66 by means of the conveyor rollers 19 and aligned along their side edges. During the lateral displacement, the gearwheel 28 continues to mesh with the gearwheel 32 due to the broadened design of said gearwheel 32. The moment the leading sheet edge reaches the synchronously driven feed rollers 52 which are responsible for its further transport, the conveyor rollers 19 are lowered with the aid of the levers 13 and 14. The lowering is controlled by the radia].
15 sensing roll 41 which, by means of the spring 42, runs on the respective contour of the radial cam disk 39, 75.
The balls 9 are now carried by the retaining metal sheet 62. With its trailing edge, the sheet slides over the guide plates of the feed plate. In cooperation with 20 the spring 51, the axial cam disk 40 now causes the axial return of the conveyor rollers 19, the radial cam disks 39, 75 and, in cooperation with the spring 42t the lifting of the levers 13, 14 and the conveyor rollers 19 in time for conveying the following sheet.
The feed rollers 52 are driven by the gearwheel 55 via the shaft 53. AS illustrated in Figures 5 and 7, the feed rollers 7 cooperating with the feed rollers 52 in accordance with the machine cycle may be secured, e.g., on a shaft 17 extending over the width of the feed table 2 and 30 being supported, on both sides thereof, in a lever 70.
Each of the levers 70 iS rotatably mounted on a respective bearing bolt 71 provided at the side frames 11, 12. A sensing roll 72 iS rotatably mounted, at least, on one lever arm of a lever 70. Via a spring 73 acting on the 35 lever 70 and being braced against a mounting support 74 provided at the side frame 11 the sensing roll 72 is in a friction contact relation with a cam of the radial cam 2 ~
disk 75 which, e.g., is also secured on the control shaft 37 (s. Figures 3 and 7). Thus, it is possible to pivot also the feed rollers 7 up and down in accordance with the machine cycle as well as the conveyor rollers 19 by means of one and the same con-trol shaft 37.
In a preferred embodiment of the device for conveying and aligning, according to the invention, additional front lays are designed in the form of rotating front lays 10, as illustrated in the figures. Seen in conveying direction, a shaft 76 is rotatably mounted between the side frames 11, 12 and upstream of the conveyor rollers 19, as shown in Figures 2 and 3. Synchronously running tapes 79 having leading-edge stops 80, which are secured thereon and which project upwards through slits provided in the guide plates 81 of the table plate, run around the rollers 77 attached on the shaft 76 and around the rollers 78 secured on the shaft 53 between the feed rollers, as can be seen in Figure 5.
In the area of the rotating conveyor rollers 19 the tapes 79 pass between the spaced conveyor rollers 19, as illustrated in Figures 2 and 3. The distances between the conveyor rollers 19 with respect to each other are such that there is still axial play between the tapes during the lateral displacement of the conveyor rollers 19. The distance between the upper and the lower strand of the tapes 79 is selected such that there is radial play with respect to the strands during the up-and-down-pivoting of the shaft 18 arranged between both strands (s. Figure 2).
The tapes 79 are also driven by the shaft 53.
In this embodiment the sheets arriving from the conveyor tapes 4 are simultaneously laid laterally against the side lay edges 66 and against the leading-edge stops 80.
The table plate between the conveyor rollers 19 and the feed rollers 52, 7 consists, e.g., of plates (not illustrated for the sake of clarity) secured between the side frames ll, 12; however, it may alternately consist of rails located below the tapes 79 of the front lays 10 rotating in accordance with the machine cycle.
The shaft 22 drives the conveyor tapes 4 additionally.
Owing to the conveying plane being bent slightly upwards between conveyor roller 19 and front lays 10, as illustrated in Figure 2, the stability of the sheet is increased during the aligning.
It is also conceivable to provide a respective axial cam disk having two displacing lever configurations on each side of the control shaft 37.
In Figure 8 two feed plates 103 for laterally aligning the sheets on the feed table are provided between the side frames 101, 102. The feed plates 3 are fastened to holders 4 which, in turn, are clamped on-to a tubular traverse 5. Said tubular traverse 5 is mounted on an axially displaceable connecting rod 6 by means of a bearing 7 and may be laterally adjusted via a handwheel 8 and a thread 9. The handwheel is braced against a bearing body 10 which is fastened to the side frame 1. The counterpressure is generated by a compression spring 11 which is provided on the opposite side, said compression spring being braced against a bearing body 12 which, too, is fastened to a side frame 2. Thus, it is possible to precisely adjust the feed plates 3 for the sheets to be printed via the handwheel 8. The bearing bushings 13, 14 which permit the axial movement of the connecting rod 6 are provided in the bearing bodies 10, 12.
A double control cam 15 having two radial cam disks 16 is secured on a drive shaft 24 (Figures 8 and 9). In the specimen embodiment illustrated, a cam roller 17 abuts one one side thereof against a cam disk 16. The cam roller 17 is fastened to a double lever 18 which is tiltably mounted in a bearing body 19, said bearing body 19 being fastened to the side frame 2. At the opposite end of the double lever 18 there is provided a first control roller 20 engaging in a grooved disk 21. Said grooved disk 21 is 3 ~
secured on the journal 22 of a conveyor roller 23 which, too, is mounted in the side frames l and 2.
Figure 10 shows the double lever 18 having a cam roller 17 engaging in the control cam 15. Opposite said cam roller 17 said double lever 18 is provided with a further control roller 25 engaging in a grooved disk 26 which, in turn, is secured on the connecting rod 6. If the drive shaft 24 imparts to the control cam 15 a rotary motion, the cam roller 17 transmits a pendular motion onto the double lever 18. Due to this pendular motion the control roller 25 drives the grooved disk 26 and causes the connecting rod 6 to execute an axial movement of stroke.
Simultaneously, the conveyor roller 23 is axially displaced in opposite direction, via the first control roller 20, as indicated by the double arrow in Figure 9.
Figure 11 shows the feed device for single sheets 27 which are moved by the conveyor roller 23, in connection with a ball 28 resting thereon, in the direction of the arrow and perpendicularly thereto up to the contact surfaces 29 of the feed plates 3. For laterally adjusting the feed plates their holders are clamped onto the tubular traverse 5 by means of a tommy screw 30 so as to be detachable. The range of adjustment of the handwheel 8 is limited by the stop 31. For this purpose the handwheel 8 is provided with a trip dog 32 and the stop 31 is provided with a further trip dog 33~ said trip dogs colliding with each other during the ro-tary motion of the handwheel 8, thus avoiding further rotation. In order to prevent the holders 4 of the feed plates 3 from being affected due to the rotary motion, there is provided a guiding rod 34 on which the holders 4 are supported.
Figures 12 through 14 show the end of the connecting rod 6 which lies opposite the grooved disk 26;
on said connecting rod there is provided a compression spring 35 which, on both sides thereof, is limited by means of disks 36 and retaining rings 37 with respect to its extension. An abutment 38 surrounds the compression spring 2 ~ 3 ~
in longitudinal direction. Said abutment 38 is guided on two sliding guidances 39 and is axially displaceable by means of an eccentri.c pin 40 for converting the direction of the spring force. Said eccentric pin 40 is fastened to a tommy 41 which is mounted in its bearing 42 provided at the side frame 1. The abutment 38 has a recess 43 which extends around the connecting rod and which is dimensioned such that the disks 36 may come into contact with the respective side of said abutment. With said abutment 38 being located as shown in Figure 5, the compression spring 35 is in a right position so that, on its left side, it is braced against the right side of the abutment 38 and abuts against the left retaining ring via the disk 36. In this connection, the force of the compression spring 35 present in the connecting rod 6 is directed to the left (Figure 12). As shown in Figure 14, the eccentric pin 40 may be moved into a middle position (tommy 41 indicated by a dash-dot line) in which no spring force acts on the connecting rod.
Depending on the fact in which direction the force of the compression spring 35 acts, the connecting rod 6 transmits a spring force onto the double lever 18, via the grooved disk 26 and the control roller 25, so that the cam roller 17 located opposite the double lever 18 abuts against the one cam disk 16 or the other, which makes it possible to control the axial movement of stroke of the conveyor roller 23 via the first control roller 20 and the grooved disk 21 such that the fed sheet abuts against either the right or the left feed plate 3. If the backside of a sheet is to be printed on, the pressman has only to shift the tommy 21 into the other position after having turned the sheet pile and inserted it in the sheet feeder, and the same edge of the fed sheet abuts against a feed plate 3 so that differences in the size of the sheets have no detrimental effects on the register.
Although various preferred embodiments of the present invention have been described herein in detail, it 2 ~
will be appreciated by those skilled in the art, that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
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According to the invention, feed plates for alternately aligning -the fed sheets are provided on both sides thereof, the sheets to be aligned being moved towards said feed plates by means of a conveyor roller which is driven so as to be axially movable by a double control cam such that the sheets to be aligned are fed by the conveyor roller so as to abut laterally against one feed plate or the other. This solution permits the pressman convert the aligning means provided on the feed table before printing on the second sheet side so that, even given a sheet pile which has been turned over, each sheet is aligned at the same edge in order to achieve an optimum register accuracy, which is especially advantageous if the paper sheets to be processed differ somewhat in size.
In an advantageous embodiment of the invention, a cam roller is assigned to the double control cam; via a double lever, a first control roller and a grooved disk, said cam roller transmits the movement of stroke onto a journal of the conveyor roller; via a connecting rod which carries a further grooved disk, a compression spring transmits the spring force onto a control roller which, via the double lever, presses the cam roller against the one or the other cam of the double control cam; and, via an abutment, the direction of force of the compression spring is reversible with respect to its direction of action.
In a further embodiment, the compression spring is provided on the connecting rod and is limited on both sides thereof by means of a respective retaining ring with respect to its extension; the abutment surrounds said compression spring in longitudinal direction, and said abutment is guided in sliding guidances and is axially displaceable by means of an eccentric pin such that, one one side, said compression is braced against said abutment and, on the other side, it is braced against a retaining ring or vice versa so that the force acts in the one direction or the other. In this embodiment, the feed plates provided on both sides of the sheets to be fed may : :
.
:
2 ~ 3 ~
be secured on a common tubular traverse which is mounted on the connecting rod and is laterally adjustable via a handwheel having a thread. Owing to this simple solution, converting the lateral sheet alignment from one side to the other may be effected free of play and with little constructional efforts.
BRIEF DESCRIPTION OF THE DRAWINGS
A specimen embodiment of the invention is schematically illustrated in the drawings, wherein:
Figure 1 is a general side elevational drawing of a printing machine comprising a device according to the invention;
Figure 2 is a side elevational view of the device according to the invention;
Figure 3 is a plan view of the device according to the invention;
Figure 4 shows, by way of example, a conveying means having balls resting thereon, according to line 4-4 of Figure 2;
Figure 5 is a cut through device along line 5-5 in Figure 2 comprising driven return pulleys for the front lays;
Figure 6 shows a lateral displacing mechanism;
Figure 7 shows, by way of example, a side elevational view of a control for the feed rollers;
Figure 8 is a fragmentary longitudinal section through the device;
Figure 9 shows a detail of the control system;
Figure 10 is a fragmentary cross-section through the device taken along line 3-3 in Figure 9;
Figure 11 is a fragmentary cross-section through the device taken along line 4-4 in Figure 8;
Figure 12 is a fragmentary longitudinal section through the converting mechanism;
3 ~
Figure 13 is a fragmentary cross-section through the converting mechanism taken along line 6-6 in Figure 8;
and Figure 14 is a top view of the converting mechanism.
DETAILED DESCRIPTIQN OF THE PREFERRED EMBODIMENTS
Paper sheets are conveyed from a pile 1 to a printing unit 3 across a feed table 2 of a sheet-fed offset printing machine comprising a single-sheet feeder. In the specimen embodiment, the paper sheets are transported to a conveying and aligning section 5 by means of conveyor tapes 4. Thereafter, the corresponding feed rollers 7, 52 bring the paper sheets into an abutting relation with a gripper bar (not illustrated) provided in the impression cylinder 6. Said impression cylinder 6 is supported in machine side frames 15, 16; the shafts 17 and 53, respectively, of the feed rollers 17 and 52, respectively, are supported in the side frames 11, 12 of the feed table. The rotating conveying means 8 and the rotating front lays 10 are located in the conveying and aligning section 5.
The shaft 18 of the rotating conveying means 8 on which conveyor rollers 19 are secured extends, on both sides thereof, through openings 20 provided in the side 25 frames 11, 12 of the feed table 2 and is mounted in bearings 21, outside of the side frames 11, 12, so as to be rotatable and displaceable. Said bearings 21, in turn, are secured in through bores provided in the levers 13, 14.
The levers 13, 14 are mounted on a shaft 22 in the 30 bearings 23, 24 provided outside the side frames 11, 12, said shaft being rotatably supported in the side frames 11, 12 and being followed by the conveyor rollers, seen in conveying direction. Gearwheels 25, 26 are provided on the outward extended journals of said shaft 22.
On its journal 27 which extends over the right side frame 12 and the bearing 21 provided in the lever 14, the extension of the shaft 18 is provided with a gearwheel 28 ' . .
2 ~ 3 ~
and a deep circumferential groove 29 with which the axial displacement roll 30 is in an operatively sliding contact relation.
A broad gearwheel 32 meshing with the gearwheels 26 and 28 is rotatably mounted on a bolt 31 provided at the lever 14.
A control shaft 37 extending - like the shafts 18 and 22 - transversely over the width of the feed table is provided downstream of the conveyor rollers 19, seen in conveying direction, and rotatably mounted below the table plate (which, for the sake of clarity, is not illustrated) in the side frames 11, 12 carrying the table plate. Said control shaft 37 extends through and beyond the two side frames 11, 12 and lies outside the range of action of the lever 14. A gearwheel 38 is secured on its left extension.
A respective radial cam disk 39 is secured at each of the two extensions. And an axial cam disk 40 is attached to the front end of the right extension.
A respective radial sensing roll 41 the circumferential surface of which is brought into contact with the corresponding radial cam disk 39 from below is rotatably mounted on each end 35, 36 of the levers 13, 14, said lever ends being located opposite the rotatable bearing of the shaft 22. In order to maintain this contract relation, a respective spring 42 which is braced against a support 43 attached to the respective outside of the side frames 11, 12 engages the underside of the lever ends 35, 36.
An axial displacement lever 45 having two lever arms 46 and 47 is pivot-mounted in a mounting support 44 which is secured at the outside of the side frame 12 above the common tangent planes of the shafts 37 and 18 and outside the range of action of the lever 14. The ends of the two lever arms 46 and 47 are provided with bolts 48, 49 pointing downward, an axial sensing roll 50 and the axial displacement roll 30, respectively, being rotatably mounted at each lower end of said bolts. Said axial sensing roll 2 ~ 3 ~
is in constant contact with the axial cam contour of the axial cam disk 40. In order to maintain this contact, a spring 51 is braced, between supporting bearings (not illustrated), against the axial displacement lever arm 46 and against the side frame 12 of the feed table.
At the end of the feed table, seen in conveying direction, the feed rollers 52 and 7 are secured on the shafts 53 and S4 extending transversely to the conveying direction and over the width of the feed table 2. The shaft 53 of the feed rollers 52 is rotatably mounted in the side frame 11 below the table plate. The gearwheels 55, 56, 57 are secured on its extension projecting outward through the left side frame. In a known manner, the gearwheel 55 is drivingly connected with the impression cylinder 6, e.g. via a gearwheel 40 and the gear rim 61.
Via intermediate gearwheels 58a and 58b, which are mounted on a bearing bolt rotatably supported at the left side frame 11, the gearwheel 56 meshes with the gearwheel 38.
The gearwheel 57 i3 drivingly connected with the gearwheel 25 of the shaft 22 via a toothed tape 59.
As shown in Figures 2 and 4, a traverse 61 is secured between the side frames 11, 12 over the width of the feed table 2, said traverse having guide bushes 60 which are aligned perpendicularly to the shaft 18 of the conveyor rollers 19 and to the conveying plane. Below the traverse 61 there is secured a retaining metal sheet 62.
Below the round guide bushes 60 the retaining metal sheet is provided with circular through openings 63 the diameter of which is smaller than the diameter of the balls 9 loosely inserted in the guide bushes 60 such that the respective ball segments or cups of the balls 9 project downward through the retaining metal sheet. With the conveyor rollers 19 being pivotted upwards, the balls rest freely on the conveyor rollers or on a sheet of paper, if there is a sheet of paper on said conveyor rollers 19. The moment the conveyor rollers 19 are moved downward, the balls 9 are also lowered until they rest on the rims of the ' . : .
openings 63 provided in the retaining metal sheet 62. The conveyor rollers are lowered below this receiving position.
Depending on the quality of the paper, the format or other individual requirements the balls may be exchanged from above with respect to their number or their quality. The balls 9 may be axially positioned such that they are axially loca-ted above a conveyor roller during the entire lateral displacement. Moreover, it is also conceivable to use other kn~wn ball-res-ting devices, e.g. laterally adjustable guide bushes.
Above, in front of and behind the guide rollers 19, the guiding rods 64, 67 extending transversely over the width of the feed table are fastened to the side frames 11, 12. A mounting support 65 having a metal sheet 68 attached to the side facing the side frame 11 is mounted on the guiding rods 64, 67 so as to be axially displaceable, said mounting support 65 and said metal sheet 68 bridging the ball-resting traverse 61. In front of and behind the conveyor rollers 19, the metal sheet 68 is provided with extensions 66 extending downward below the conveying plane.
These extensions 66 do not contact the conveyor rollers 19 and serve as lateral lay edges. For laterally adjusting the position of the lay edges, the mounting support 65 may be laterally fastened by means of a fixing means 69 with respect to the guiding rod 64.
The device operates as described hereinafter: The shaft 53 is driven, via the gearwheel 55, synchronously and in accordance with the machine cycle, a drive connecting extending from the impression cylinder 6 to said shaft.
The conveyor rollers 19 are driven synchronously via the drive connections 57, 59, 25, 22, 26, 32, 28 and via the gear train 56, 58a, 58b, 38 of the control shaft 37, said control shaft 37 being driven synchronously and in accordance with the machine cycle. In their upper position, the conveyor rollers 19 take over, with the aid of the resting balls 9, the transport of the sheet supplied from the feed pile 1 by the conveyor tapes 4. By pivoting 2 ~ 3 ~
the axial displacement lever 45, the shaft 18, together with the conveyor rollers 19, is laterally displaced towards the lay edges 66; this pivoting motion is achieved by the spring 51 which ensures that the roll 50 runs on the 5 axial cam disk 40. With the aid of the resting balls 9, the sheets are frictionally moved laterally to the edges 66 by means of the conveyor rollers 19 and aligned along their side edges. During the lateral displacement, the gearwheel 28 continues to mesh with the gearwheel 32 due to the broadened design of said gearwheel 32. The moment the leading sheet edge reaches the synchronously driven feed rollers 52 which are responsible for its further transport, the conveyor rollers 19 are lowered with the aid of the levers 13 and 14. The lowering is controlled by the radia].
15 sensing roll 41 which, by means of the spring 42, runs on the respective contour of the radial cam disk 39, 75.
The balls 9 are now carried by the retaining metal sheet 62. With its trailing edge, the sheet slides over the guide plates of the feed plate. In cooperation with 20 the spring 51, the axial cam disk 40 now causes the axial return of the conveyor rollers 19, the radial cam disks 39, 75 and, in cooperation with the spring 42t the lifting of the levers 13, 14 and the conveyor rollers 19 in time for conveying the following sheet.
The feed rollers 52 are driven by the gearwheel 55 via the shaft 53. AS illustrated in Figures 5 and 7, the feed rollers 7 cooperating with the feed rollers 52 in accordance with the machine cycle may be secured, e.g., on a shaft 17 extending over the width of the feed table 2 and 30 being supported, on both sides thereof, in a lever 70.
Each of the levers 70 iS rotatably mounted on a respective bearing bolt 71 provided at the side frames 11, 12. A sensing roll 72 iS rotatably mounted, at least, on one lever arm of a lever 70. Via a spring 73 acting on the 35 lever 70 and being braced against a mounting support 74 provided at the side frame 11 the sensing roll 72 is in a friction contact relation with a cam of the radial cam 2 ~
disk 75 which, e.g., is also secured on the control shaft 37 (s. Figures 3 and 7). Thus, it is possible to pivot also the feed rollers 7 up and down in accordance with the machine cycle as well as the conveyor rollers 19 by means of one and the same con-trol shaft 37.
In a preferred embodiment of the device for conveying and aligning, according to the invention, additional front lays are designed in the form of rotating front lays 10, as illustrated in the figures. Seen in conveying direction, a shaft 76 is rotatably mounted between the side frames 11, 12 and upstream of the conveyor rollers 19, as shown in Figures 2 and 3. Synchronously running tapes 79 having leading-edge stops 80, which are secured thereon and which project upwards through slits provided in the guide plates 81 of the table plate, run around the rollers 77 attached on the shaft 76 and around the rollers 78 secured on the shaft 53 between the feed rollers, as can be seen in Figure 5.
In the area of the rotating conveyor rollers 19 the tapes 79 pass between the spaced conveyor rollers 19, as illustrated in Figures 2 and 3. The distances between the conveyor rollers 19 with respect to each other are such that there is still axial play between the tapes during the lateral displacement of the conveyor rollers 19. The distance between the upper and the lower strand of the tapes 79 is selected such that there is radial play with respect to the strands during the up-and-down-pivoting of the shaft 18 arranged between both strands (s. Figure 2).
The tapes 79 are also driven by the shaft 53.
In this embodiment the sheets arriving from the conveyor tapes 4 are simultaneously laid laterally against the side lay edges 66 and against the leading-edge stops 80.
The table plate between the conveyor rollers 19 and the feed rollers 52, 7 consists, e.g., of plates (not illustrated for the sake of clarity) secured between the side frames ll, 12; however, it may alternately consist of rails located below the tapes 79 of the front lays 10 rotating in accordance with the machine cycle.
The shaft 22 drives the conveyor tapes 4 additionally.
Owing to the conveying plane being bent slightly upwards between conveyor roller 19 and front lays 10, as illustrated in Figure 2, the stability of the sheet is increased during the aligning.
It is also conceivable to provide a respective axial cam disk having two displacing lever configurations on each side of the control shaft 37.
In Figure 8 two feed plates 103 for laterally aligning the sheets on the feed table are provided between the side frames 101, 102. The feed plates 3 are fastened to holders 4 which, in turn, are clamped on-to a tubular traverse 5. Said tubular traverse 5 is mounted on an axially displaceable connecting rod 6 by means of a bearing 7 and may be laterally adjusted via a handwheel 8 and a thread 9. The handwheel is braced against a bearing body 10 which is fastened to the side frame 1. The counterpressure is generated by a compression spring 11 which is provided on the opposite side, said compression spring being braced against a bearing body 12 which, too, is fastened to a side frame 2. Thus, it is possible to precisely adjust the feed plates 3 for the sheets to be printed via the handwheel 8. The bearing bushings 13, 14 which permit the axial movement of the connecting rod 6 are provided in the bearing bodies 10, 12.
A double control cam 15 having two radial cam disks 16 is secured on a drive shaft 24 (Figures 8 and 9). In the specimen embodiment illustrated, a cam roller 17 abuts one one side thereof against a cam disk 16. The cam roller 17 is fastened to a double lever 18 which is tiltably mounted in a bearing body 19, said bearing body 19 being fastened to the side frame 2. At the opposite end of the double lever 18 there is provided a first control roller 20 engaging in a grooved disk 21. Said grooved disk 21 is 3 ~
secured on the journal 22 of a conveyor roller 23 which, too, is mounted in the side frames l and 2.
Figure 10 shows the double lever 18 having a cam roller 17 engaging in the control cam 15. Opposite said cam roller 17 said double lever 18 is provided with a further control roller 25 engaging in a grooved disk 26 which, in turn, is secured on the connecting rod 6. If the drive shaft 24 imparts to the control cam 15 a rotary motion, the cam roller 17 transmits a pendular motion onto the double lever 18. Due to this pendular motion the control roller 25 drives the grooved disk 26 and causes the connecting rod 6 to execute an axial movement of stroke.
Simultaneously, the conveyor roller 23 is axially displaced in opposite direction, via the first control roller 20, as indicated by the double arrow in Figure 9.
Figure 11 shows the feed device for single sheets 27 which are moved by the conveyor roller 23, in connection with a ball 28 resting thereon, in the direction of the arrow and perpendicularly thereto up to the contact surfaces 29 of the feed plates 3. For laterally adjusting the feed plates their holders are clamped onto the tubular traverse 5 by means of a tommy screw 30 so as to be detachable. The range of adjustment of the handwheel 8 is limited by the stop 31. For this purpose the handwheel 8 is provided with a trip dog 32 and the stop 31 is provided with a further trip dog 33~ said trip dogs colliding with each other during the ro-tary motion of the handwheel 8, thus avoiding further rotation. In order to prevent the holders 4 of the feed plates 3 from being affected due to the rotary motion, there is provided a guiding rod 34 on which the holders 4 are supported.
Figures 12 through 14 show the end of the connecting rod 6 which lies opposite the grooved disk 26;
on said connecting rod there is provided a compression spring 35 which, on both sides thereof, is limited by means of disks 36 and retaining rings 37 with respect to its extension. An abutment 38 surrounds the compression spring 2 ~ 3 ~
in longitudinal direction. Said abutment 38 is guided on two sliding guidances 39 and is axially displaceable by means of an eccentri.c pin 40 for converting the direction of the spring force. Said eccentric pin 40 is fastened to a tommy 41 which is mounted in its bearing 42 provided at the side frame 1. The abutment 38 has a recess 43 which extends around the connecting rod and which is dimensioned such that the disks 36 may come into contact with the respective side of said abutment. With said abutment 38 being located as shown in Figure 5, the compression spring 35 is in a right position so that, on its left side, it is braced against the right side of the abutment 38 and abuts against the left retaining ring via the disk 36. In this connection, the force of the compression spring 35 present in the connecting rod 6 is directed to the left (Figure 12). As shown in Figure 14, the eccentric pin 40 may be moved into a middle position (tommy 41 indicated by a dash-dot line) in which no spring force acts on the connecting rod.
Depending on the fact in which direction the force of the compression spring 35 acts, the connecting rod 6 transmits a spring force onto the double lever 18, via the grooved disk 26 and the control roller 25, so that the cam roller 17 located opposite the double lever 18 abuts against the one cam disk 16 or the other, which makes it possible to control the axial movement of stroke of the conveyor roller 23 via the first control roller 20 and the grooved disk 21 such that the fed sheet abuts against either the right or the left feed plate 3. If the backside of a sheet is to be printed on, the pressman has only to shift the tommy 21 into the other position after having turned the sheet pile and inserted it in the sheet feeder, and the same edge of the fed sheet abuts against a feed plate 3 so that differences in the size of the sheets have no detrimental effects on the register.
Although various preferred embodiments of the present invention have been described herein in detail, it 2 ~
will be appreciated by those skilled in the art, that variations may be made thereto without departing from the spirit of the invention or the scope of the appended claims.
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Claims (17)
1. Device for conveying and aligning paper sheets at a feed table of a printing machine comprising a single-sheet feeder, an aligning section, and conveying means rotating on shafts and conveying the sheets across said aligning section to the following feed rollers for feeding the sheets to a gripper bar provided in an impression cylinder, characterized in that shafts are mounted in bearings so as to be rotatable and cyclically displaceable laterally to the sheet-conveying direction, said bearings, in turn, being fastened to side frames of a feed table so as to be cyclically adjustable with respect to their vertical position, that, laterally in front of and behind a rotating conveying means, aligning edges, in the form of la-teral aligning limitations, are provided at a feed plate, said feed plate being provided on guides secured in said side frames above the feed table so as to be laterally adjustable with respect to its position, the lower edge of said feed plate extending over said conveying means without contacting it.
2. Device according to the features of claim 1, characterized in that, above the rotating conveying means, balls rest with their own weight on said lifted rotating conveying means, said balls being freely rotatable in all directions and being inserted in guide bushes so as to be perpendicularly movable with respect to the table plate, each of said guide bushes being equipped with retaining means preventing said balls from falling out of said guide bushes, when said rotating conveying means is lowered.
3. Device according to the features of claim 1, characterized in that the rotating conveying means consists of one conveyor roller or of a plurality of conveyor rollers having the same diameter, said conveyor roller/s being firmly attached onto the shaft which is provided with drive means.
4. Device according to the features of claim 1, characterized in that a respective lever is fastened to the respective outer side of the side frames so as to be rotatable about a pivoting axis, that said side frames feature openings through which the shafts of the rotating conveying means project outward through said side frames so as to be freely movable, that the bearings for rotatably and displaceably mounting said shafts are concentrically fastened to said levers, that means are provided for pivoting up and down said levers in accordance with the machine cycle.
5. Device according to the features of Claim 3, characterized in that a respective lever is fastened to the respective outer side of the side frames so as to be rotatable about a pivoting axis, that said side frames feature openings through which the shaft of the conveyor rollers projects outward through said side frames so as to be freely movable, that the bearings for rotatably and displaceably mounting said shaft are concentrically fastened to said levers, that means are provided for pivoting up and down said levers in accordance with the machine cycle, that there is provided an extension of said shaft running outward through a bearing provided at the lever, and that lateral displacement means as well as the drive means for driving said conveyor rollers are operatively connected with said extension of the shaft.
6. Device according to the features of Claim 5, characterized in that the extension of the shaft running through a bearing provided in the lever features a circumferential guide groove with which a guide roll is in a constant sliding contact relation, said guide roll having a rotational plane extending parallel to the axis of said shaft, that an axial displacement lever having two lever arms is pivot-mounted on a lateral mounting support provided at the same outer side of the side frame at which the extension of the shaft is provided, said guide roll being rotatably mounted on the one lever arm, that a control shaft is supported in the side frames below the table plate, a drive connection extending from said drive shaft to the impression cylinder, an axial cam disk being coaxially fastened to the end of said extension outside the side frame, that a sensing roll is in a constant contact relation with the axial cam disk along the cam contour of said axial cam disk, said sensing roll being rotatable mounted on the second lever arm of the axial displacement lever.
7. Device according to the features of claim 6, characterized in that a gearwheel is secured on the extension of the shaft, that, coaxially to the pivoting axis of the levers, a drive shaft extending, in the form of pins, on both sides thereof, through the side frames, is rotatably supported in said side frames of the feed table below the feed plate, said levers being axially secured on said pins so as to be freely rotatable, that gearwheels are secured on both pins outside said levers, that an especially broad gearwheel is axially secured on a bolt of the lever so as to be freely rotatable, said gearwheel meshing with the gearwheel provided on the extension of the shaft and with a gearwheel provided on the one pin, that a gearwheel is also secured on the extension of the control shaft extending outward through the side frame located opposite the axial cam disk, that a gear train extending to the impression cylinder is provided between the gearwheel secured on the pin and the gearwheel secured on the control shaft, that, at least, on one of the two levers a radial sensing roll having an axis of rotation extending parallel to the control shaft is mounted so as to be freely rotatable on the lever end lying opposite the pivoting axis extending through the bearing, that, corresponding to said radial sensing roll and located on the same side of the feed table, a radial cam disk, in addition to the axial cam disk, is coaxially secured on the control shaft outside the side frame of the feed table, said radial cam disk being in a constant contact relation with said radial sensing roll.
8. Device according to the features of claim 7, characterized in that the axial cam disk and the radial cam disk are attached on the same extension of the control shaft.
9. Device according to the features of claim 1, 2 or 3, characterized in that, directly in front of and behind the conveying means, the lower edge of the feed plate features extensions the lower portions of which are designed as lay edges and are out of contact with the conveying means.
10. Device according to the features of claim 1, 2 or 3, characterized in that, in addition, front lays are rotatingly guided over the area of the rotating conveying means, said front lays having a rear point of reversal in the area of the feed rollers, and that in a respective point of reversal said front lays are operatively connected with a drive shaft, a gear train extending from the printing unit to said drive shaft.
11. Device according to the features of claim 1, 2 or 3, characterized in that there are provided drive means for the shaft, that there are provided means for laterally displacing the shafts in their bearings, that there are provided lifting means for lifting and lowering said bearings, respectively, and that said drive means for the shaft, said lateral displacement means and said lifting means for, respectively, lifting and lowering the rotating conveying means feature a common gear train extending to the printing unit.
12. Device according to the features of claim 7, characterized in that, in addition, front lays are rotatingly guided over the area of the rotating conveying means, said front lays having a rear point of reversal in the area of the feed rollers, and that in a respective point of reversal said front lays are operatively connected with a drive shaft, a gear train extending from the printing unit to said drive shaft.
13. Device according to the features of claim 7, characterized in that there are provided drive means for the shaft, that there are provided means for laterally displacing the shafts in their bearings, that there are provided lifting means for lifting and lowering said bearings, respectively, and that said drive means for the shaft, said lateral displacement means and said lifting means for, respectively, lifting and lowering the rotating conveying means feature a common gear train extending to the printing unit.
14. Device for conveying and aligning paper sheets at a feed table of a printing machine comprising a single-sheet feeder, an aligning section and a rotating conveyor roller for conveying sheets, an aligning means being provided in said aligning section and being mounted above said feed table so as to be adjustable in its lateral position and including feed plates for alternately aligning the fed sheets being provided on both sides thereof, the sheets to be aligned being moved towards said feed plates by means of a conveyor roller driven by a double control cam so as to be axially displacement such that said sheets to be aligned are brought into lateral contact with the one feed plate or the other.
15. Device according to claim 14, in which a cam roller is assigned to the double control cam, said cam roller transmitting the movement of stroke onto a journal of the conveyor roller via a double lever, a first control roller and a grooved disk; in which a compression spring transmits the spring force onto a control roller via a connecting rod carrying a further grooved disk, said control roller pressing said cam roller against the one cam disk or the other of the double control cam via the double lever; and in which the direction of force of said compression spring is reversible with respect to the direction of action via an abutment.
16. Device according to claim 1 or 2, in which the compression spring is provided on the connecting rod and is limited in its extension on both sides thereof, via a respective retaining ring; in which the abutment surrounds said compression spring in longitudinal direction; and in which said abutment is guided on sliding guidances and is axially displaceable for converting the lateral abutting of the sheets against the feed plates by means of an eccentric pin such that one side of said compression spring is braced against a retaining ring or vice versa so that the force acts in the one direction or the other.
17. Device according to claim 14, in which the feed plates provided on both sides of the sheets to be fed are secured on a common tubular traverse which is mounted on the connecting rod and is laterally adjustable via a handwheel having a thread.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4035907A DE4035907C1 (en) | 1990-11-12 | 1990-11-12 | Printing machine paper sheet feeder and aligner - has feed members on shafts, rotatably and laterally displaceably mounted w.r.t. to sheet feed |
| DE4035907.7 | 1990-11-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2054135A1 true CA2054135A1 (en) | 1992-05-13 |
Family
ID=6418081
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002054135A Abandoned CA2054135A1 (en) | 1990-11-12 | 1991-10-24 | Device for conveying and aligning paper sheets at a feed table of a printing machine comprising a single-sheet feeder |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JPH0755559B2 (en) |
| CA (1) | CA2054135A1 (en) |
| DE (1) | DE4035907C1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112677646A (en) * | 2020-12-23 | 2021-04-20 | 乐俊威 | Lithography apparatus with prevent off normal printing function |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4112337C1 (en) * | 1990-11-12 | 1992-10-29 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg, De | |
| DE4239732A1 (en) * | 1992-11-26 | 1994-06-01 | Heidelberger Druckmasch Ag | Sheet sepn. and orientation feeder for single-sheet printer - has independently rotated suction rollers at sides of machine for sheet alignment with linear imaging array |
| DE19749605A1 (en) * | 1997-11-10 | 1999-05-27 | Oce Printing Systems Gmbh | Transport system for paper or film in electrographic printing or copying machine |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3663011A (en) * | 1969-12-01 | 1972-05-16 | Miller Printing Machinery Co | Printing press nonstop side register mechanism |
-
1990
- 1990-11-12 DE DE4035907A patent/DE4035907C1/en not_active Expired - Lifetime
-
1991
- 1991-10-24 CA CA002054135A patent/CA2054135A1/en not_active Abandoned
- 1991-11-11 JP JP3294013A patent/JPH0755559B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112677646A (en) * | 2020-12-23 | 2021-04-20 | 乐俊威 | Lithography apparatus with prevent off normal printing function |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0755559B2 (en) | 1995-06-14 |
| JPH04267153A (en) | 1992-09-22 |
| DE4035907C1 (en) | 1992-05-27 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Dead |