CA2482227A1 - Device for positioning the sheets into an introduction station of a processing machine - Google Patents
Device for positioning the sheets into an introduction station of a processing machine Download PDFInfo
- Publication number
- CA2482227A1 CA2482227A1 CA002482227A CA2482227A CA2482227A1 CA 2482227 A1 CA2482227 A1 CA 2482227A1 CA 002482227 A CA002482227 A CA 002482227A CA 2482227 A CA2482227 A CA 2482227A CA 2482227 A1 CA2482227 A1 CA 2482227A1
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- Canada
- Prior art keywords
- sheets
- sheet
- transverse slide
- lateral
- transverse
- 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
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Classifications
-
- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H3/00—Separating articles from piles
- B65H3/34—Article-retaining devices controlling the release of the articles to the separators
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- 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
- B65H9/06—Movable stops or gauges, e.g. rising and falling front 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
- B65H9/20—Assisting by photoelectric, sonic, or pneumatic indicators
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2403/00—Power transmission; Driving means
- B65H2403/50—Driving mechanisms
- B65H2403/51—Cam mechanisms
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2511/00—Dimensions; Position; Numbers; Identification; Occurrences
- B65H2511/50—Occurence
- B65H2511/51—Presence
- B65H2511/512—Marks, e.g. invisible to the human eye; Patterns
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Registering Or Overturning Sheets (AREA)
- Making Paper Articles (AREA)
Abstract
This device for positioning the sheets (1) comprises a feed table (T) owning means for driving the sheets, at least one front positioning stop (2) for stopping the leading edges of the sheets, register means for the lateral position of the sheets (1), means for comparing said position to a reference position, transverse drive means (7) of the sheets (1) and control means (6) for applying said drive means (7). The transverse drive means comprise a transverse slide (13) arranged between said stop (2) and said feed table (T), drive means (7) for said transverse slide (13) connected to said control means (6) and means (27a, 27b) for jointly attaching the sheet (1) to the transverse slide (13).
Description
DEVICE FOR POSITIONING THE SHEETS INTO AN INTRODUCTION
STATION OF A PROCESSING MACHINE
The present invention refers to a device for positioning the sheets into an introduction station of a processing machine, comprising a feed table with drive means for said sheets, at least one positioning front stop for stopping the leading edges of said sheets, means for registering the lateral position of said sheets, means for comparing said position to a reference position, means for transversely driving said sheets and control means for controlling said drive 1 o means in dependence on the direction and the space between the registered lateral position of said sheet and said reference position and for stopping the latter when the sheet meets with said reference position.
In the positioning devices usually used 'for machines processing paperboard, solid board, corrugated board sheets, such as converting presses comprising a plurality of stations, the positioning of the sheets must be very accurate as well in a longitudinal direction as in a transverse direction at each station they cross. To this end, the sheets are regularly infed by a feeder towards the feed table, shingling the sheets and enabling their seizing by the gripper bar as well as their. conveying towards the subsequent stations.
STATION OF A PROCESSING MACHINE
The present invention refers to a device for positioning the sheets into an introduction station of a processing machine, comprising a feed table with drive means for said sheets, at least one positioning front stop for stopping the leading edges of said sheets, means for registering the lateral position of said sheets, means for comparing said position to a reference position, means for transversely driving said sheets and control means for controlling said drive 1 o means in dependence on the direction and the space between the registered lateral position of said sheet and said reference position and for stopping the latter when the sheet meets with said reference position.
In the positioning devices usually used 'for machines processing paperboard, solid board, corrugated board sheets, such as converting presses comprising a plurality of stations, the positioning of the sheets must be very accurate as well in a longitudinal direction as in a transverse direction at each station they cross. To this end, the sheets are regularly infed by a feeder towards the feed table, shingling the sheets and enabling their seizing by the gripper bar as well as their. conveying towards the subsequent stations.
2 o The sheet is usually aligned on the feed table first of all against front stops and then against lateral stops by means of advance rollers or plastic foils supporting downwards on the table. When processing thin sheets, since the latter are often injured when they reach the stops, they can generate thus a positioning error and their edges are marked.
The problem arising in the sheet positioning is also especially delicate when the sheet performed several operations such as printing, folding lines creasing, diecutting, since said operations must be carried out the most exactly depending on the preceding operation. In spite of all cautions, errors or drifts in position of the processed portion with respect to the leading and lateral 3 0 edges of the sheet are issued, for example, from successive alignments at different locations of a sheet edge being not exactly rectilinear, or from systematic alignments at the same locations while leaving a mark. However, the diecutting of pre-printed elements do not allow any positioning error so as to reach the desired quality of the manufactured product.
US 6'264'196 relates to a specification wherein, when the sheet reaches front stops mounted on a cylinder, it is seized by means of a gripper of a gripping device arranged on a carriage laterally held by two opposed compression springs. One of the latter being coaxial to a rod and compressed between the end of the carriage and one rod shoulder. The end of said rod helds a pressure roller actuated against a cam section, located between two standby areas 41, 42. When the sheets reach the front stops, it is seized by the gripping device and the rod roller rests in the standby area of the cam. Once the grippers close, the pivoting cylinder drives the roller into a cam section while laterally moving the carriage and thus the sheet itself. When the detector registers said sheet edge, a brake is actuated to stop the carriage. The remaining travel of the rod is absorbed by the spring.
One notes thus that in said abovementioned document, the register position is not compared with a reference one for moving the sheet into one direction and with a distance corresponding to the space between the registered lateral position of the aligning mark and the reference position.
No comparison is effectively carried out and the original position of the sheet is not registered. One simply moves the sheet until its lateral edge reaches the desired position. The displacement applied by the cam remains the same and 2 o is not related to the registered error, since the latter is unknown. One simply stops the carriage when the sheet edge is registered by a detector. However, the front stops are not fixed, but fixedly attached to the cylinder.
US 4'989'855 described a positioning device wherein the stops are motorized in order to modify their position. Said device comprises means for registering an aligning mark on the sheets to be aligned, comparing it with a reference position and adjusting the stops for correcting the sheet position.
Such a device works like a common device and owns the same risks, namely as far as the lateral aligning is concerned.
One proposed in EP 669'274 an aligning device wherein the sheet 3 o to align is actuated against the front lays, is then laterally moved against side guides by means of a pull rod and a pad between which the sheet is seized.
The sheet is stopped moving by side guides and the pull rod ends its motion sliding with respect to the flat element. Such a device is more particularly adapted for relative rigid sheets such as corrugated ones.
EP 1'044'908 describes a positioning device with no pad, comprising a movable shelf with temporary fastening means for the sheet to ~_ _._ ___ _. .... _ s align, that, on the one hand, is longitudinally moved by a back-and-forth motion and, on the second hand, by correction motions about three vertical studs being each fixedly attached to a carriage, a central carriage sliding into a longitudinal guide and two lateral carriages sliding into transverse guides. The correction motions of said shelf are produced by three linear motors controlled by opto-electronic registering means. The correction is carried out during the sheet conveying by the movable shelf, in order to drive the leading edge of the sheet in the grippers of a gripper bar in an accurate reference position, so that the temporary fastening means of the shelf can free the sheet and the shelf can be brought back in its origin position for restarting with a new sheet. Said device saves the time needed for sheets alignment, increasing thus appreciably the processing machine rate.
EP 1'151'833 refers to a closely related device, wherein a sheet gripping device is connected to the movable shelf by at least one link comprising a plurality of levers forming a parallelogram that can be put out of shape about an horizontal swiveling axis in order to impede the arrival of a component of horizontal strength issued from the opening levers of the temporary fastening grippers of one sheet edge on the shelf.
Both abovementioned devices are very efficient as well as the positioning accuracy as the rate increasing of said positioned sheets are concerned. The alternative of an uninterrupted positioning of the conveyed sheet effectively enables saving the time needed for a common alignment.
However, the resulting productivity increase requires then a huge investment.
The cost increase between a common registering system and an uninterrupted positioning device like the one described in EP 1'044'908 and EP 1'151'833 is effectively appreciable and economically justified only for some kind of machines.
One described lastly in EP 1'308'406 a device for registering a lateral edge of a sheet in an introduction station. According to the device of the 3 0 invention, one compares the registered position of one lateral edge of the sheet with the desired position, one produces a correction signal that generates an adjusting signal transmitted to an adjusting member for moving said lateral edge to the desired position. One operates thus directly on the conveyed sheet with respect to the measured space between the registered position and the desired position. On the other hand, said document includes no detail about how to perform the method.
The problem arising in the sheet positioning is also especially delicate when the sheet performed several operations such as printing, folding lines creasing, diecutting, since said operations must be carried out the most exactly depending on the preceding operation. In spite of all cautions, errors or drifts in position of the processed portion with respect to the leading and lateral 3 0 edges of the sheet are issued, for example, from successive alignments at different locations of a sheet edge being not exactly rectilinear, or from systematic alignments at the same locations while leaving a mark. However, the diecutting of pre-printed elements do not allow any positioning error so as to reach the desired quality of the manufactured product.
US 6'264'196 relates to a specification wherein, when the sheet reaches front stops mounted on a cylinder, it is seized by means of a gripper of a gripping device arranged on a carriage laterally held by two opposed compression springs. One of the latter being coaxial to a rod and compressed between the end of the carriage and one rod shoulder. The end of said rod helds a pressure roller actuated against a cam section, located between two standby areas 41, 42. When the sheets reach the front stops, it is seized by the gripping device and the rod roller rests in the standby area of the cam. Once the grippers close, the pivoting cylinder drives the roller into a cam section while laterally moving the carriage and thus the sheet itself. When the detector registers said sheet edge, a brake is actuated to stop the carriage. The remaining travel of the rod is absorbed by the spring.
One notes thus that in said abovementioned document, the register position is not compared with a reference one for moving the sheet into one direction and with a distance corresponding to the space between the registered lateral position of the aligning mark and the reference position.
No comparison is effectively carried out and the original position of the sheet is not registered. One simply moves the sheet until its lateral edge reaches the desired position. The displacement applied by the cam remains the same and 2 o is not related to the registered error, since the latter is unknown. One simply stops the carriage when the sheet edge is registered by a detector. However, the front stops are not fixed, but fixedly attached to the cylinder.
US 4'989'855 described a positioning device wherein the stops are motorized in order to modify their position. Said device comprises means for registering an aligning mark on the sheets to be aligned, comparing it with a reference position and adjusting the stops for correcting the sheet position.
Such a device works like a common device and owns the same risks, namely as far as the lateral aligning is concerned.
One proposed in EP 669'274 an aligning device wherein the sheet 3 o to align is actuated against the front lays, is then laterally moved against side guides by means of a pull rod and a pad between which the sheet is seized.
The sheet is stopped moving by side guides and the pull rod ends its motion sliding with respect to the flat element. Such a device is more particularly adapted for relative rigid sheets such as corrugated ones.
EP 1'044'908 describes a positioning device with no pad, comprising a movable shelf with temporary fastening means for the sheet to ~_ _._ ___ _. .... _ s align, that, on the one hand, is longitudinally moved by a back-and-forth motion and, on the second hand, by correction motions about three vertical studs being each fixedly attached to a carriage, a central carriage sliding into a longitudinal guide and two lateral carriages sliding into transverse guides. The correction motions of said shelf are produced by three linear motors controlled by opto-electronic registering means. The correction is carried out during the sheet conveying by the movable shelf, in order to drive the leading edge of the sheet in the grippers of a gripper bar in an accurate reference position, so that the temporary fastening means of the shelf can free the sheet and the shelf can be brought back in its origin position for restarting with a new sheet. Said device saves the time needed for sheets alignment, increasing thus appreciably the processing machine rate.
EP 1'151'833 refers to a closely related device, wherein a sheet gripping device is connected to the movable shelf by at least one link comprising a plurality of levers forming a parallelogram that can be put out of shape about an horizontal swiveling axis in order to impede the arrival of a component of horizontal strength issued from the opening levers of the temporary fastening grippers of one sheet edge on the shelf.
Both abovementioned devices are very efficient as well as the positioning accuracy as the rate increasing of said positioned sheets are concerned. The alternative of an uninterrupted positioning of the conveyed sheet effectively enables saving the time needed for a common alignment.
However, the resulting productivity increase requires then a huge investment.
The cost increase between a common registering system and an uninterrupted positioning device like the one described in EP 1'044'908 and EP 1'151'833 is effectively appreciable and economically justified only for some kind of machines.
One described lastly in EP 1'308'406 a device for registering a lateral edge of a sheet in an introduction station. According to the device of the 3 0 invention, one compares the registered position of one lateral edge of the sheet with the desired position, one produces a correction signal that generates an adjusting signal transmitted to an adjusting member for moving said lateral edge to the desired position. One operates thus directly on the conveyed sheet with respect to the measured space between the registered position and the desired position. On the other hand, said document includes no detail about how to perform the method.
The present invention has an aim to obviate, at least partly, the usual drawbacks of the common sheet aligning devices, without resulting in a considerable increased cost of the processing machine, to which the sheets positioning device is related.
To this end, the present invention relates first to a sheet positioning device into an introduction station of a processing machine according to claim 1.
The main advantage of the present invention is to join two aligning methods. To align the sheet leading edge, it uses, likes for common positioning 1 o devices, front lays against which the sheet is conveyed by means of the feed table, since said method of positioning the leading edges of the sheets is liable, simple and owns no appreciable drawback. Said front lays can be fixed or adjustable. For lateral alignment, one uses a method wherein sheets driving means are controlled by opto-electronic means, without using thus side guides owning drawbacks, i.e. especially when processing with flexible sheets. Since the lateral alignment is achieved, as it is the same case for common positioning systems, once the leading edge of the sheet is aligned by the front lays, the single movement to apply to the sheet for laterally aligroing it is a rectilinear one, which means an appreciable simplification, as well as 'the mechanical design or 2 o the electronical control are concerned, with respect to a movable device according to three vertical axis, like for abovementioned devices. Another important advantage of the present invention is due t~o the fact that the lateral alignment enables a sheets displacement in both directions, whereas a mechanical positioning allows only to pull or to push, while moving the sheet in only one direction.
Finally, whereas the devices for a single mechanical positioning only can align the sheets depending on the sheet edge, the device according to the invention can achieve said positioning according to a printed aligning mark.
It enables preventing from errors repetition between the print of the sheets 3 o printed in reels and their edges sectionally diecut by the reel, while using the print and not the diecut sheet edge as a reference and whose angle of the leading edge of the sheet to align can vary of several degrees with respect to the perpendicular axis.
Further features and advantages of this invention will become evident from the reading of the following descriptiorn and from the enclosed _ . __.~. .~ _.. .an_....a....__... . _. _._ _ _ ~~ ... ,.__._.. ____ __~_~~....._ _._.__ _ _ _ ~______ r drawings illustrating, schematically and by way of example, an embodiment of the device for positioning according to the present invention in which Fig. 1 is a perspective view illustrating the method of positioning of the invention;
Fig. 2 is a transverse elevation view of the positioning device;
Fig. 3 is a sectional view according to the line lll-III of fig. 2;
Fig. 4 is a sectional view according to the line IV-IV of fig. 2;
Fig. 5 is the same view as fig. 2, illustrating an alternative;
Fig. 6 is a sectional view according to the line Vi-VI of fig. 5;
l0 Fig. 7 is a sectional and partially enlarged view of the inner part of the ring VII of fig. 5;
Fig. 8 is a data-processing diagram of the control device of the method of positioning.
The method of positioning is illustrated on figs. 1 to 8. The sheet 1 to align is conveyed by a feed table T of a sheets processing machine, like a diecutting press, a printing machine, wherein the sheet that just went through a printing or diecutting operation must be accurately positioned with a view to a subsequent operation, so as to ensure a same reference position of the sheet for the successive operations, so that the print or diecutting position, for 2 o example, is not shifted with respect to the preceding diecutting or printing operation.
To this end, after the first operation, the sheet 1 is conveyed in the direction of arrow F by the feed table T against a range of front lays 2, whose position could be adjustable. In this example, this operation is preferably carried 2 5 out by means of at least one pressure roller 3, controlled by a cam or a pneumatic cylinder (not shown), pressing the sheet 1 against a transverse slide 4, arranged between the feed table T and the front lava 2. Said pressure roller 3 could also be a gripping device, namely a suction pipe arranged on the transverse sliding and connected to a suction supply. A photoelectric cell or a 3 o camera 5 is adapted to register a lateral edge of the sheet 1 or, preferably, an aligning mark, whose position is typically the one of the printing or diecutting of said sheet 1 and to compare said position to a relference one. Said cell is connected to an input of a control station 6, of which one output is connected to an actuator, namely a linear motor 7 for driving the transverse slide 4 with 35 respect to the space between the measured lateral position of the sheet and the reference position. Said control station 6 produces a supply current of a ' p - 6 - JBF287 linear motor 7 in dependence with the direction into ~rvhich the linear motor moves to bring the edge of the sheet 1 in the reference position.
Figs. 2 to 4 illustrate the device for positioning the sheets into an introduction station of a processing machine. Said device comprises in its centre a transverse support 8 fixedly attached to the frame 9 of the processing machine extending to both ends of the transverse support 8. The latter comprises in its centre a linear motor 7, of which a U-shaped magnet rail 10 is fastened by means of screws 11 to said transverse support 8. A reel 12, arranged into the magnet rail 10 of the linear motor 7, is fastened to a movable section 13 of said linear motor 7 by means of screws 16. Said reef 12 is connected to an output of the control station 6 (Fig. 1 ). The movable section 13, acting like a transverse slide, is connected to the transverse support 8 by two carriages 14a, 14b arranged on both sides of the linear motor 10, 12. Each carriage 14a, 14b is coupled to two parallel guiding slides 15a, 15b (Fig. 3).
The upper surface of said transverse slide, made up of the movable section 13, is fixedly attached to an aluminum section 17 covered 'with a material owning a high friction coefficient such as polyurethane, or presenting a rough surface.
The positioning device comprises also a transverse profile 18 fixedly attached to two vertical slides 19a, 19b, mounted in two vertical guides 20a, 20b fixedly attached to the frame 9. The bottom of each vertical slide 19a, 19b is pressed by a spring 21 a, 21 b against a roller 22a, 22b, assembled swiveling at the end of an arm of a swing 23a, 23b rotatable in its centre on the frame 9. Another roller, of which only the roller 24a is shown on fig. 4, is assembled swiveling at the other arm end of each swing 23a, 23b. Said rollers of the swings 23a, 23b being pressed against two related cams, of which only the cam 25a is shown on Fig. 4, are fixedly attached to a control shaft 26 kinematically linked to the drive mechanism {not shown) of the processing machine for the sheets 1.
Two pairs of pressure rollers 27a, 27b are freely swiveling about 3o axis perpendicular to the transverse section 18, i.e. parallel to the advance direction F of the sheet 1 and fixedly attached to two supports 28a, respectively 28b. Each support 28a, 28b comprise two adjusting units 29a, 29b, 30a, 30b to adjust the height, respectively the lateral position of each support 28a, 28b.
Each turn about the control shaft 26 is related to a working cycle of the positioning device during which the cams 25a, 25b are pivoting the swings 23a, 23b, driving thus the rollers 27a, 27b downwards against the aluminum section 17, seizing thus the sheet 1 between said section 17 and the rollers 27a, 27b after said sheet is supporting against the front lays 2. The register cell registers the position of the lateral edge of the sheet 1 or of an aligning mark on said sheet and sends the value as well as the direction of the measured 5 space to the control station 6. The latter sends an electric current to the reel 12 of the linear motor for moving the transverse slide 13, forming the movable part of the linear motor, in the desired direction until the position registered by the register cell refers about the lateral position of the sheet 1 as being related to the reference position.
Said operation of lateral displacement of the sheet 1 by the linear motor is achieved in synchronism with the rotation of the control shaft 26, so that when the correction is over, the cams 25a, 25b, connected to the control shaft 26, are swiveling the swings 23a, 23b (Fig. 4) in the anticlockwise direction, while raising the slides 19a, 19b and the rollers 27a, 27b. The sheet 1 is thus free and the cycle can re-start with a new sheet 1. The means used for stripping the positioned sheet comprise a common gripper bar. The latter is not shown insofar it is not mentioned in the present invention and is of no use for its understanding.
According to the alternative of the device illustrated on figs. 5 to 7, instead of joining the transverse section 18 to vertical slides 19a, 19b, said alternative comprises a transverse section 31 fixedly attached by its both ends to the frame 9. Each pair of pressure rollers or shoes 27a, 27b is then fixedly attached to the rod of a cylinder 32a, 32b, as well ass to two guide rods 33a, 33b, arranged sliding inside the cylinder 32a, 32b, so that said rollers or shoes 27a, 27b are applied against the sheet 1 supporting on the movable section 13 of the linear motor at the time of its lateral alignment by means of the cylinders 32a, 32b. Such an alternative is more advantageous than the embodiment illustrated by fig. 2, since less expensive.
To this end, the present invention relates first to a sheet positioning device into an introduction station of a processing machine according to claim 1.
The main advantage of the present invention is to join two aligning methods. To align the sheet leading edge, it uses, likes for common positioning 1 o devices, front lays against which the sheet is conveyed by means of the feed table, since said method of positioning the leading edges of the sheets is liable, simple and owns no appreciable drawback. Said front lays can be fixed or adjustable. For lateral alignment, one uses a method wherein sheets driving means are controlled by opto-electronic means, without using thus side guides owning drawbacks, i.e. especially when processing with flexible sheets. Since the lateral alignment is achieved, as it is the same case for common positioning systems, once the leading edge of the sheet is aligned by the front lays, the single movement to apply to the sheet for laterally aligroing it is a rectilinear one, which means an appreciable simplification, as well as 'the mechanical design or 2 o the electronical control are concerned, with respect to a movable device according to three vertical axis, like for abovementioned devices. Another important advantage of the present invention is due t~o the fact that the lateral alignment enables a sheets displacement in both directions, whereas a mechanical positioning allows only to pull or to push, while moving the sheet in only one direction.
Finally, whereas the devices for a single mechanical positioning only can align the sheets depending on the sheet edge, the device according to the invention can achieve said positioning according to a printed aligning mark.
It enables preventing from errors repetition between the print of the sheets 3 o printed in reels and their edges sectionally diecut by the reel, while using the print and not the diecut sheet edge as a reference and whose angle of the leading edge of the sheet to align can vary of several degrees with respect to the perpendicular axis.
Further features and advantages of this invention will become evident from the reading of the following descriptiorn and from the enclosed _ . __.~. .~ _.. .an_....a....__... . _. _._ _ _ ~~ ... ,.__._.. ____ __~_~~....._ _._.__ _ _ _ ~______ r drawings illustrating, schematically and by way of example, an embodiment of the device for positioning according to the present invention in which Fig. 1 is a perspective view illustrating the method of positioning of the invention;
Fig. 2 is a transverse elevation view of the positioning device;
Fig. 3 is a sectional view according to the line lll-III of fig. 2;
Fig. 4 is a sectional view according to the line IV-IV of fig. 2;
Fig. 5 is the same view as fig. 2, illustrating an alternative;
Fig. 6 is a sectional view according to the line Vi-VI of fig. 5;
l0 Fig. 7 is a sectional and partially enlarged view of the inner part of the ring VII of fig. 5;
Fig. 8 is a data-processing diagram of the control device of the method of positioning.
The method of positioning is illustrated on figs. 1 to 8. The sheet 1 to align is conveyed by a feed table T of a sheets processing machine, like a diecutting press, a printing machine, wherein the sheet that just went through a printing or diecutting operation must be accurately positioned with a view to a subsequent operation, so as to ensure a same reference position of the sheet for the successive operations, so that the print or diecutting position, for 2 o example, is not shifted with respect to the preceding diecutting or printing operation.
To this end, after the first operation, the sheet 1 is conveyed in the direction of arrow F by the feed table T against a range of front lays 2, whose position could be adjustable. In this example, this operation is preferably carried 2 5 out by means of at least one pressure roller 3, controlled by a cam or a pneumatic cylinder (not shown), pressing the sheet 1 against a transverse slide 4, arranged between the feed table T and the front lava 2. Said pressure roller 3 could also be a gripping device, namely a suction pipe arranged on the transverse sliding and connected to a suction supply. A photoelectric cell or a 3 o camera 5 is adapted to register a lateral edge of the sheet 1 or, preferably, an aligning mark, whose position is typically the one of the printing or diecutting of said sheet 1 and to compare said position to a relference one. Said cell is connected to an input of a control station 6, of which one output is connected to an actuator, namely a linear motor 7 for driving the transverse slide 4 with 35 respect to the space between the measured lateral position of the sheet and the reference position. Said control station 6 produces a supply current of a ' p - 6 - JBF287 linear motor 7 in dependence with the direction into ~rvhich the linear motor moves to bring the edge of the sheet 1 in the reference position.
Figs. 2 to 4 illustrate the device for positioning the sheets into an introduction station of a processing machine. Said device comprises in its centre a transverse support 8 fixedly attached to the frame 9 of the processing machine extending to both ends of the transverse support 8. The latter comprises in its centre a linear motor 7, of which a U-shaped magnet rail 10 is fastened by means of screws 11 to said transverse support 8. A reel 12, arranged into the magnet rail 10 of the linear motor 7, is fastened to a movable section 13 of said linear motor 7 by means of screws 16. Said reef 12 is connected to an output of the control station 6 (Fig. 1 ). The movable section 13, acting like a transverse slide, is connected to the transverse support 8 by two carriages 14a, 14b arranged on both sides of the linear motor 10, 12. Each carriage 14a, 14b is coupled to two parallel guiding slides 15a, 15b (Fig. 3).
The upper surface of said transverse slide, made up of the movable section 13, is fixedly attached to an aluminum section 17 covered 'with a material owning a high friction coefficient such as polyurethane, or presenting a rough surface.
The positioning device comprises also a transverse profile 18 fixedly attached to two vertical slides 19a, 19b, mounted in two vertical guides 20a, 20b fixedly attached to the frame 9. The bottom of each vertical slide 19a, 19b is pressed by a spring 21 a, 21 b against a roller 22a, 22b, assembled swiveling at the end of an arm of a swing 23a, 23b rotatable in its centre on the frame 9. Another roller, of which only the roller 24a is shown on fig. 4, is assembled swiveling at the other arm end of each swing 23a, 23b. Said rollers of the swings 23a, 23b being pressed against two related cams, of which only the cam 25a is shown on Fig. 4, are fixedly attached to a control shaft 26 kinematically linked to the drive mechanism {not shown) of the processing machine for the sheets 1.
Two pairs of pressure rollers 27a, 27b are freely swiveling about 3o axis perpendicular to the transverse section 18, i.e. parallel to the advance direction F of the sheet 1 and fixedly attached to two supports 28a, respectively 28b. Each support 28a, 28b comprise two adjusting units 29a, 29b, 30a, 30b to adjust the height, respectively the lateral position of each support 28a, 28b.
Each turn about the control shaft 26 is related to a working cycle of the positioning device during which the cams 25a, 25b are pivoting the swings 23a, 23b, driving thus the rollers 27a, 27b downwards against the aluminum section 17, seizing thus the sheet 1 between said section 17 and the rollers 27a, 27b after said sheet is supporting against the front lays 2. The register cell registers the position of the lateral edge of the sheet 1 or of an aligning mark on said sheet and sends the value as well as the direction of the measured 5 space to the control station 6. The latter sends an electric current to the reel 12 of the linear motor for moving the transverse slide 13, forming the movable part of the linear motor, in the desired direction until the position registered by the register cell refers about the lateral position of the sheet 1 as being related to the reference position.
Said operation of lateral displacement of the sheet 1 by the linear motor is achieved in synchronism with the rotation of the control shaft 26, so that when the correction is over, the cams 25a, 25b, connected to the control shaft 26, are swiveling the swings 23a, 23b (Fig. 4) in the anticlockwise direction, while raising the slides 19a, 19b and the rollers 27a, 27b. The sheet 1 is thus free and the cycle can re-start with a new sheet 1. The means used for stripping the positioned sheet comprise a common gripper bar. The latter is not shown insofar it is not mentioned in the present invention and is of no use for its understanding.
According to the alternative of the device illustrated on figs. 5 to 7, instead of joining the transverse section 18 to vertical slides 19a, 19b, said alternative comprises a transverse section 31 fixedly attached by its both ends to the frame 9. Each pair of pressure rollers or shoes 27a, 27b is then fixedly attached to the rod of a cylinder 32a, 32b, as well ass to two guide rods 33a, 33b, arranged sliding inside the cylinder 32a, 32b, so that said rollers or shoes 27a, 27b are applied against the sheet 1 supporting on the movable section 13 of the linear motor at the time of its lateral alignment by means of the cylinders 32a, 32b. Such an alternative is more advantageous than the embodiment illustrated by fig. 2, since less expensive.
Claims (9)
1. Device for positioning the sheets (1) into an introduction station of a processing machine, comprising a feed table (T) including drive means for the said sheets, at least one stop (2) of front positioning to stop the leading edges of said sheets (1), register means (5) of the lateral position of said sheets (1), means for comparing said position to a reference position, transverse drive means (7) for said sheets (1) and control means (6) for applying said drive means (7) with respect to the direction and the space between the lateral registered position of said sheet and said reference position and to stop the latter when the sheet position is in conformity with the reference position, characterized in that the said transverse drive means (7) comprise a transverse slide (13) arranged between said stop (2) and said feed table (T), drive means (7) of said transverse slide (13) connected to said control means (6) and means (27a,27b) for jointly attaching said sheet (1) with the transverse slide (13).
2. Device according to claim 1, wherein means for jointly attaching said sheet (1) with the transverse slide (13) comprise, respectively on both sides of the plane sheet, at least one pressing device (27a,27b), for seizing said sheet (1) against said transverse slide (13), and means (19a, 19b; 32a, 32b) for perpendicularly moving said pressing device (27a, 27b) with respect to said sheet (1).
3. Device according to one of the preceding claims, wherein said means for moving said pressing device (27a, 27b) comprise two slides (19a, 19b) perpendicularly arranged with respect to said sheet, kinematically linked to the drive mechanism (26) of said processing machine.
4. Device according to claim 1, wherein the surface (17) of said transverse slide (13) in contact with said sheets (1) is made of a material with a high coefficient of friction with respect to this sheets matter.
5. Device according to claim 1, wherein the surface (17) of said transverse slide (13) in contact with said sheets (1) is rough.
6. Device according to one of the preceding claims, wherein two swings (23a,23b) mounted each about an horizontal axis and whose one respective ends come in contact with the respective lower ends of said vertical slides (19a,19b), wherein the latter comprise elastic means (21a, 21b) for applying said other respective ends of said swings (23a, 23b) against the cams (25a, 25b) fixedly attached to a shaft (26) kinematically linked to said drive means of the feed table (T) of the processing machine.
7. Device according to claim 2, wherein said pressing devices (27a, 27b) are each fixedly attached to a jack (32a, 32b) for bringing them in contact with said transverse slide (13).
8. Device according to one of the preceding claims, wherein said transverse slide (13) is slidably mounted by means of two guiding carriages (14a, 14b).
9. Device according claim 1, wherein said sheets (1) own a print and a lateral aligning mark, related to the lateral position of said print, said register means (5) of the lateral position of said sheets (1) comprising an optical reader (5) for forming successive prints of the lateral positions of the trajectories of said respective lateral aligning marks with respect to said reference position.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH01624/03 | 2003-09-23 | ||
| CH16242003 | 2003-09-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2482227A1 true CA2482227A1 (en) | 2005-03-23 |
Family
ID=34280718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002482227A Abandoned CA2482227A1 (en) | 2003-09-23 | 2004-09-21 | Device for positioning the sheets into an introduction station of a processing machine |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20050062220A1 (en) |
| JP (1) | JP2005096998A (en) |
| KR (1) | KR100594338B1 (en) |
| CN (1) | CN1308208C (en) |
| BR (1) | BRPI0404063B1 (en) |
| CA (1) | CA2482227A1 (en) |
| TW (1) | TWI248415B (en) |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5595366B2 (en) * | 2010-12-15 | 2014-09-24 | キヤノン株式会社 | Skew correction device and image forming apparatus |
| DE102011084696A1 (en) * | 2011-10-18 | 2013-04-18 | Hostert Pro Gmbh | Device for feeding sheet material |
| US8579284B2 (en) * | 2012-03-28 | 2013-11-12 | Xerox Corporation | Pneumatic sheet registration and clamping |
| ES2711538T3 (en) * | 2012-09-06 | 2019-05-06 | Heidelberger Druckmasch Ag | Device for the alignment of sheets with articulated arm support |
| JP6526806B2 (en) * | 2014-10-24 | 2019-06-05 | ボブスト メックス ソシエテ アノニムＢｏｂｓｔ Ｍｅｘ ＳＡ | Lateral positioning device for seat elements |
| JP2016185860A (en) * | 2015-03-27 | 2016-10-27 | 富士ゼロックス株式会社 | Sheet conveyance device and image forming apparatus |
| CN108177995A (en) * | 2018-02-09 | 2018-06-19 | 广东鸿铭智能股份有限公司 | A kind of method of school paper |
Family Cites Families (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3311197A1 (en) * | 1983-03-26 | 1984-10-04 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg | METHOD FOR FITTING BOWS WITH A FIT |
| DE3417764A1 (en) * | 1984-05-12 | 1985-11-14 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg | FEEDING DEVICE FOR BOW-PROCESSING MACHINES, IN PARTICULAR PRINTING MACHINES |
| US4823159A (en) * | 1985-04-25 | 1989-04-18 | Canon Kabushiki Kaisha | Image forming apparatus |
| CH676695A5 (en) * | 1988-05-19 | 1991-02-28 | Bobst Sa | |
| IT1240137B (en) * | 1990-03-20 | 1993-11-27 | Olivetti & Co Spa | SHEET FORWARD AND ALIGNMENT DEVICE FOR A PRINTER |
| US5119213A (en) * | 1990-07-27 | 1992-06-02 | Xerox Corporation | Scanner document absence code system |
| US5273274A (en) * | 1992-09-04 | 1993-12-28 | Xerox Corporation | Sheet feeding system with lateral registration and method for registering sheets |
| US5301938A (en) * | 1992-12-17 | 1994-04-12 | Xerox Corporation | Apparatus for gripping and registering sheets |
| CH689639A5 (en) * | 1994-02-24 | 1999-07-30 | Bobst Sa | Device for lateral aligning of flat elements on a table. |
| DE19618030B4 (en) * | 1996-05-04 | 2006-06-01 | Heidelberger Druckmaschinen Ag | Method and device for laterally aligning a sheet |
| DE19781181D2 (en) * | 1996-10-22 | 1999-12-23 | Oce Printing Systems Gmbh | Alignment device |
| US5809878A (en) * | 1997-09-16 | 1998-09-22 | Becmar Corp. | Rigid sheet printer/feed board assembly |
| US6575458B2 (en) * | 2001-07-27 | 2003-06-10 | Xerox Corporation | Printer sheet deskewing system |
| DE10254330A1 (en) * | 2001-12-20 | 2003-07-10 | Heidelberger Druckmasch Ag | Sheet aligning device for feeder of sheet processing machine e.g. printing press has wedge-like slide for actuating push rod provided for vertically adjusting top lays |
-
2004
- 2004-09-02 TW TW093126514A patent/TWI248415B/en active
- 2004-09-21 CA CA002482227A patent/CA2482227A1/en not_active Abandoned
- 2004-09-22 JP JP2004275692A patent/JP2005096998A/en active Pending
- 2004-09-22 US US10/946,999 patent/US20050062220A1/en not_active Abandoned
- 2004-09-23 CN CNB2004100826427A patent/CN1308208C/en active Active
- 2004-09-23 BR BRPI0404063A patent/BRPI0404063B1/en active IP Right Grant
- 2004-09-23 KR KR1020040076564A patent/KR100594338B1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| KR20050030154A (en) | 2005-03-29 |
| CN1308208C (en) | 2007-04-04 |
| BRPI0404063A (en) | 2006-05-02 |
| CN1600661A (en) | 2005-03-30 |
| TW200517331A (en) | 2005-06-01 |
| BRPI0404063B1 (en) | 2015-12-22 |
| TWI248415B (en) | 2006-02-01 |
| US20050062220A1 (en) | 2005-03-24 |
| KR100594338B1 (en) | 2006-06-30 |
| JP2005096998A (en) | 2005-04-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |