CA2158388A1 - Device for the deceleration of sheets - Google Patents
Device for the deceleration of sheetsInfo
- Publication number
- CA2158388A1 CA2158388A1 CA002158388A CA2158388A CA2158388A1 CA 2158388 A1 CA2158388 A1 CA 2158388A1 CA 002158388 A CA002158388 A CA 002158388A CA 2158388 A CA2158388 A CA 2158388A CA 2158388 A1 CA2158388 A1 CA 2158388A1
- Authority
- CA
- Canada
- Prior art keywords
- sheet
- accordance
- brake
- brake strap
- suction
- 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
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H29/00—Delivering or advancing articles from machines; Advancing articles to or into piles
- B65H29/68—Reducing the speed of articles as they advance
- B65H29/686—Pneumatic brakes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2801/00—Application field
- B65H2801/03—Image reproduction devices
- B65H2801/21—Industrial-size printers, e.g. rotary printing press
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
- Discharge By Other Means (AREA)
- Sheets, Magazines, And Separation Thereof (AREA)
Abstract
The invention relates to a device for the deceleration of sheets, particularly for the delivery of a sheet-fed printing press, said device comprising at least one brake strap to which a suction device is assigned, said brake strap being connected with a driving facility which generates variable rotational speed. It is provided that the brake strap (3) comprises at least one discrete suction device (8) revolving with said brake strap (3), said suction device (8) acting on a selective partial area of the sheet (2) to be decelerated, and that the remaining section of the brake strap facing the respective remaining area of the sheet format has no or no active suction device (8).
Description
21~838~
A-1402 08.09.95 - 1 - untmw.e Devlce for the Deceleration of Sheets The invention relates to a device for the deceleration of sheets, particularly for the delivery of a sheet-fed printing press, said device having at least one brake strap to which a suction device is assigned, said brake strap being connected with a driving facility which generates variable rotational speed.
A device having the aforementioned features is disclosed in DE 41 19 511 Al. The known brake strap co~prises an air-permeable rotary band to which is assigned a suction box.
The band is guided around three guide rolls, with preferably the intermediate roll being connected with a motor adapted for running with variable speed, in order to decrease the rotational speed of the band and to increase it again, whereby this speed decrease and increase takes place in accordance with the cycle of delivery of sheets to be decelerated. The known device is designed for decelerating unprinted sheets which are discharged especially from cross-cutting machines.
It is the object of the present invention to provide a device of the type mentioned above which is suitable for a smear-free deceleration of printed sheets, preferably in two-sided printing as well as in perfecting.
The object is solved in accordance with the invention, in that the brake strap comprises at least one discrete suction device rotating therewith and acting on a selective partial area of the sheet to be decelerated, and in that a section of the brake strap facing the respective re~; ni ng area of the sheet format has at least no active suction device. This kind of design permits the suction device only to act exactly on a selective partial area of the sheet to be decelerated, this ~ 2158388 A-1402 08.09.95 - 2 - untmw.e partial area preferably being the unprinted rear edge of the sheet. Thereby, it is ensured that the respective rem~; n; ng area of the sheet format is guided in contact-free manner, which means that, if printing ink is there, it cannot smear.
Since the suction device is strictly located in one or also in several places of the brake strap and the rem~;n;ng surface of the brake strap has no or no active suction device, it is ensured that the sheet area facing this rem~;n;ng surface of said brake strap cannot be sucked up and, thus, is not subjected to contact with the brake strap.
The brake strap is controlled or regulated through the driving facility in such a way that always the selectable partial area of the sheet to be decelerated comes in contact with the suction device.
It is especially provided that the suction device has at least one suction opening which is partially formed at the brake strap. However, it is also feasible that, for example, one row of suction-openings is formed at the brake strap transversely to its rotational direction. Furthermore, it is feasible that several suction devices of this type of design or also another design are arranged in spaced relation over the length of the brake strap, so that per sheet to be decelerated the brake strap does not perform a full but a partial revolution.
Preferably, the suction device comprises at least one suction element extending outwardly and rising above the outer contour of the brake strap, particularly a suction cam or a suction bar. This type of design is especially advantageous, as the sheet moving over the suction device keeps a relative distance from the outer contour, due to the suction elements extending outwardly and rising above the outer contour, so that contact and, thus, smearing is prevented with certainty.
In the case of a design of the suction element as suction bar, such suction bar extends transversely to the rotational ~ 215838~
A-1402 08.09.95 - 3 - untmw.e direction of the brake strap and has a suction opening or multiple suction openings (preferably in a row) on its top side.
In accordance with a further development of the invention there is provided that the driving facility causes the brake strap to have a speed in correspondence with the sheet speed while the sheet rear edge is sucked up. Thus, the suction device and the sheet rear edge move at the same speed, that is, in synchronism with one another at the moment of sucking.
Furthermore, there is provided that after the sheet rear edge has been sucked up the driving facility decreases the rotational speed of the brake strap. In this way damage-free deposit of the sheets on a pile of sheets can take place.
Particularly, there is provided that the driving facility is an electric servomotor. Preferably, the servomotor is of a type which allows for very strong and quick acceleration and deceleration. For example, such a motor can drive directly -that is, without the intermediary o~ gearing - respective guide rolls of the brake strap.
In accordance with another development of the invention, a suspended guiding system for the sheet is assigned to the brake strap. By means of suspended guidance the sheet is guided contact-free to the brake strap and then sucked up at its rear edge and decelerated. Thereby, the sheet is preferably transported by a gripper system, the grippers of which being opened as soon as the rear edge of the sheet has been picked up.
Preferably, suspended guiding sections of the suspended guiding system are arranged in front of the brake strap, as seen in sheet-travel direction. It is advantageous to have at least one suspended guiding section of the suspended guiding system arranged laterally of the brake strap, whereby with 215~38~
A-1402 08.09.95 - 4 - untmw.e "lateral" a direction is meant which extends transversely to the sheet travel direction.
In particular, there can be provided that multiple brake straps are arranged at a lateral distance from one another.
These brake straps, thus, form a brake strap array extending over the sheet width, so that the rear edge of the sheet is contacted by multiple brake straps. Especially, there may be provided a respective suspended guiding section between the brake straps, as described above.
In accordance with a preferred embodiment of the invention there is provided that the suspended guiding system assigned to the brake strap comprises a plurality of air nozzles with streams of air emerging therefrom and creating a layer of carrying-air which enables the contact-free guidance of the sheets. Hereby, there may be provided that the air streams in a first area are directed contrary to the sheet travel direction and the air streams in a second area are directed towards the sheet travel direction. Between said two areas there can pre~erably be created an air ~low-off zone which, for example, may be in the form of a gap extending over the width of the sheet transport path, so that the carrying-air streams coming from both areas move towards the gap and are conducted away through it.
Finally, said first area is located downstream with respect to said second area, as seen in sheet travel direction.
Furthermore, it is preferably provided that a brake band forming the brake strap is in form-locking operative connection with the servomotor.
The invention will be best understood upon reading the following description of preferred embodiments in view of the accompanying drawings, wherein A-1402 08.09.95 - 5 - untmw.e Fig. 1 is a schematic side view of a device for the deceleration of sheets in a first mode of operation;
Fig. 2 shows the device of Fig. 1 in a further mode of operation - without driving facility;
Fig. 3 shows the device of Fig. 1 in a yet further mode of operation - without driving facility;
Fig. 4 is a top view of the device as shown in Fig. 1;
Fig. 5 is a diagram illustrating a section of the timing course of speed of the brake band in an exemplary embodiment;
Fig. 6 is a diagram of the timing course of the speeds of sheets on the one hand (dash-dot-line) and of the brake band on the other hand (solid line) during two consecutive cycles, during which two consecutive sheets are received by the suction device and decelerated; and Fig. 7 is a diagram of the timing course of the speeds of two consecutive sheets on the one hand (dash-dot-line) and of the brake band on the other hand (solid line) in different consecutive modes of operation of a device in accordance with the invention.
Fig. 1 shows a device 1 for decelerating sheets 2, wherein a respective sheet 2 is initially moved across the device 1 a certain stretch by means of a gripper system 9 and is then released from the gripper system 9, as explained in detail hereinafter. The device 1 comprises a brake strap 3 which is wound around two guide rolls 4, at least one of said guide rolls 4 being in operative connection with a driving facility A-1402 08.09.95 - 6 - untmw.e which is in the form of a servomotor M. The brake strap 3 is formed by means of a brake band 5 (suction band) which is caused by the driving facility to revolve at varying rotational speed in the direction of the arrow 6. Between the two guide rolls 4 there is a suction box 7 which is connected to a vacuum source not illustrated herein.
The brake band 5 has a discrete suction device 8 which revolves with the brake band 5. "Discrete" has the meaning that the suction device 8 is located well-aimed on a certain place on the brake band 5, so that at least sections of the brake strap 3 formed by means of the brake band 5 do not have a suction device 8 or at least not an active suction device 8. "Not active" means that a sheet 2 located above the device 1 is not sucked up. When a sheet 2 is moved over the device 1 in the direction of an arrow 10 by means of a gripper system 9 which grips the front edge of the sheet 2, a synchronisation with the suction device 8 takes place in a manner that the sheet rear edge 11 is sucked up. At the moment of suction the suction device 8 and the sheet 2 move at equal speed, that is to say, there is no relative speed in the direction of the arrow 10 between the sheet 2 and the brake band 5. The grippers of the gripper system 9 open as soon as the sheet is sucked up, so that the sheet 2 is gripped in the region of its rear edge 11 and held by means of the suction device 8 and, due to a delayed motion of the brake band 5, is decelerated and subsequently delivered to a sheet pile 12 at decreased speed in a manner that no damage to the sheet 2 does occur. Above the sheet pile 12 may be provided an arrangement for generating blowing air, in order to facilitate deposit of the sheets. The direction of the blowing air is indicated by arrows 13.
In Fig. 1 can be seen that not only one suction device 8 but, for example, two or more suction devices 8 may be assigned to the brake band 5, so that during one revolution of the brake ~158388 A-1402 08.09.95 - 7 - untmw.e strap 3 a respective number of sheets 2 can be decelerated.
The suction devices 8 cooperate with the suction box 7 while they are passing over it, so that the vacuum existing in the suction box 7 will be effective on the sheet 2.
There may particularly be provided that the suction device 8 is designed as a suction bar extending transversely to the direction of rotation of the brake strap 3, said suction bar having a suitable array of suction openings on its top side, which cooperate with the rear edge 11 of a respective sheet 2.
Fig. 2 illustrates the device of Fig. 1 with the gripper system 9 having operationally moved further, that is, the preceding sheet 2 is still held at its rear edge 11 by the suction device 8 while the succeeding sheet 2 is already sectionally located above the device 1 but is not sucked up as yet. A sheet is sucked up only when the rear edge 11 of a succeeding sheet 2 is positioned opposite a suction device 8.
Thereby, a smear-free deceleration of the sheet 2 is ensured.
Fig. 3 shows the device of Fig. 1 in a mode of operation wherein the above mentioned succeeding sheet 2 has already partially been transported over the sheet pile 12.
Fig. 4 shows a top view of the device 1 having multiple brake straps 3 which are arranged transversely to the sheet travel direction 14 in spaced relation to one another. Thereby, an array of side-by-side brake straps 3 is formed, said brake straps 3 moving at varying rotational speed in synchronism with one another, so that sheet deceleration can take place as described above. Fig. 4 shows a part of a sheet 2, whereof the rear edge 11 has already been released by the brake straps 3. Thus, the speed of the sheet 2 has already been decreased, so that it can be deposited on the sheet pile 12.
Laterally of the outer brake straps 3 as well as between the ~ 2158388 A-1402 08.09.95 - 8 - untmw.e individual brake straps 3 suspended guiding sections 15 are formed. These are complemented by a further suspended guiding section 16 arranged in front of the brake straps 3, as viewed in sheet travel direction. Adjacent thereto there is an air flow-off zone 17 and a further suspended guiding section 18, as viewed contrary to the sheet travel direction 14. The suspended guiding sections 16 and 18 as well as the suspended guiding sections 15 include a plurality of air nozzles not shown in the drawings, with air streams 19 emerging therefrom which, together, form a layer of carrying-air whereon the sheets 2 can be transported in suspended manner. The suspended guiding sections 15 and the suspended guiding section 16 form a first area 20 wherein the air streams 19 are directed contrary to the sheet travel direction 14. The tightening or stretching of the sheet 2 achieved thereby has an advantageous effect on the moving behavior of the respective sheet rear edge 11 in that it facilitates accurate and defined picking-up of said sheet rear edge 11 by the suction device 8. The suspended guiding section 18 forms a second area 21 wherein the air streams 19 have the direction of the sheet travel direction 14. Consequently, the air streams 19 of the first and second areas 20 and 21 directed towards one another meet in the air flow-off zone 17 which is preferably designed as a gap 22 extending over the entire width of the guiding path for the sheets 2.
Due to the layer of carrying-air formed by the air streams 19, the respective sheet 2 - the front edge of which being gripped by grippers of the gripper system 9 - is moved contact-free over the brake straps 3 in a manner that, on passing, the sheet rear edge 11 is picked up by the suction devices 8 located on the brake straps 3.
Through a decrease in rotational speed of the brake strap 3 the speed of the sheet 2 is decreased while the sheet rear edge 11 is held by the suction devices 8 of said brake A-1402 08.09.95 - 9 - untmw.e strap 3, so that deposit of the sheet 2 can take place on the sheet pile 12 without damage or smearing of said sheet 2.
Appropriate variable rotational speeds of the brake straps 3 are generated by means of a driving facility, preferably in the form of a servomotor M.
Fig. 5 shows a section of the timing course of the speed v in m/s of the suction devices 8 of the brake straps 3 of an exemplary embodiment. It can be seen that initially a relatively low speed v is used which increases, starting at the point of time tl and reaches a highest value at the point of time t2, then it r~m~; n.~ constant up to the point of time t3. From there the speed v is decreased again up to the point of time t4 and reaches the same value as at the point of time tl. In the span of time t2 - t3 a sheet take-over takes place, that is to say, in this span of time the suction devices 8 of the brake straps 3 have a high speed v which equal to the speed v of the sheet 2. With the sheet rear edge 11 subsequently being held by the suction devices 8, the deceleration motion (span of time t3 - t4) takes place, whereby the sheet 2 is decelerated to the speed of the point of time t4. After the point of time t4 the sheet 2 is released and, thus, deposited on the sheet pile 12.
Subsequently, an acceleration takes place again - as at the point of time tl -, and the next sheet 2 is sucked up at an initially high speed and then decelerated.
Fig. 6 shows a diagram wherein, aside from the timing course of the speed of the brake band 5 indicated by a solid line 24, there is additionally indicated by dash-dot-lines 23 the course of speed of two successive sheets 2 within the range of the device 1 in accordance with the invention.
Actually, the lines 23 coincide with line 24 in their respective upper level, in their descending branches and in respective sections of their lower level. For reasons of clarity, however, a manner of illustration has been chosen 215838~
A-1402 08.09.95 - 10 - untmw.e which deviates therefrom. Particularly at the moment of sheet take-over by the suction device 8 or one of the suction devices 8, i.e. when the sheet rear edge 11 is sucked up (point of time t5 in Fig. 6), the speed of the sheet 2 and that of the suction device 8 are e~ual. By decreasing the speed of the suction device 8 the speed of the sheet 2 is equally decreased. A respective end of the lines 23 (point of time t6, t6') located on the lower level is synonymous with a release of the respective sheet 2 taking place on the part of the device 1. This release has the result that the sheet 2 leaves the device 1 at a now decreased speed and deposits itself on the sheet pile 12 in the course of its further movement. The start of line 23 shown to the right in Fig. 6 (point of time t7) is synonymous with the entry into the range of the device 1 of a successive sheet 2 which follows a decelerated sheet 2, in order to then be picked up by the suction device 8 or one of the suction devices 8 at the point of time t5' and to be released again at the point of time t6'. The spans of time between t5 and t5' or between t6 and t6' correspond with the time cycle at which the consecutive sheets 2 are conveyed into the range of the device 1 by means of a respective gripper system 9.
For the realization of the mode of operation of periodically picking-up a sheet 2 by means o~ a suction device 8 at corresponding speeds of sheet 2 and suction device 8, the subsequent joint deceleration and the release of the respective decelererated sheet 2 on the part of the suction device 8, as shown in Fig. 6 by means of a speed diagram, the phase position of the suction device 8 revolving with the brake band 5 is chosen such, that a suction device 8 faces a respective sheet 2 for the first time when it has reached the speed of the not decelerated sheet 2, and that after release of the sheet 2 (point of time t6 or t6') said suction device 8 faces away from a conveying surface passed by successive sheets 2. Of course, this will be true for an A-1402 08.09.95 untmw.e t arrangement of one suction device 8 at an individual position along the brake band 5 or multiple suction devices 8 in spaced apart positions along the brake band 5.
Fig. 7 illustrates a mode of operation for a first sheet, namely "inspection sheet removal" which, in view of the use of a device 1 according to the invention in a delivery of a sheet-fed printing press, can also be realized with said device 1, and the mode of operation for a successive second sheet 2 as described hereinabove, in short called "braking cycle", for depositing this sheet 2 on a sheet pile 12 at a decreased speed resulting from the respective existing speeds of sheet 2 (line 23') on the one hand and of the brake band 5 (line 24') on the other hand. As already explained in connection with Fig. 6, here, too, the lines 23' and 24' coincide in some areas, which is not shown in the drawings, thus, in the same areas as in the mode of operation according to Fig. 6. In the mode of operation "inspection sheet removal" the brake band 5 is controlled in a manner that during a complete time cycle (equal to a span o~ time between t6 and t6') no suction device 8 is facing a sheet 2 conveyed over the device 1 by means of a gripper system 9. Also, this mode of operation does not have the requirement of release of the sheet on the part of the gripper system 9 as soon as the point of time t5 indicated in Fig. 7, and corresponding to that in Fig. 6, is reached. The sheet 2 can rather be conveyed further individually and also beyond the sheet pile 12 to be fed to an inspection station.
The quantitative values given in Fig. 5 in association with the diagram of Fig. 7 make clear the special advantages of a device 1 in accordance with the invention, being equipped with an electric servomotor. These advantages are to be seen in the fact that it merely takes suitable electric control means to fulfill the function of deceleration of the sheet 2 at a fast rate of succession of sheets 2 in accordance with ;~1583~8 A-1402 08.09.95 - 12 - untmw.e the time cycles of modern sheet-fed printing presses on the one hand, and to stop said deceleration during a respective single chosen machine cycle on the other hand.
For the realization of the course of movement of the brake band 5 as illustrated in the diagrams, said brake band 5 is in form-locking operative connection with the servomotor M.
In the present exemplary embodiment the driving facility as schematically illustrated in Fig. 1, as well as the guide rolls 4 and the brake band 5 are designed as a cogged belt drive.
The control of the servomotor preferably takes place in a manner that the sheet deposit speed rem~' ns constant, even when speed variations in the printing process or the like occur.
By means of the device in accordance with the invention the sheet is taken over at defined spots, then decelerated and deposited. Thereby, the gripper-opening motion is coordinated with the brake band control. The sheet deposit achieved by a controlled suction cam contributes considerably to an an operationally stable and defined formation of a sheet pile with edges being accurately aligned.
A-1402 08.09.95 untmw.e LIST OF REFERENCE NUMERALS
1 device for deceleration of sheets 2 sheet(s) 3 brake strap(s) 4 guide rolls brake band 6 arrow 7 suction box 8 suction device 9 gripper system arrow 11 sheet rear edge 12 sheet pile 13 arrow 14 sheet travel direction suspended guiding section(s) 16 suspended guiding section 17 air flow-off zone 18 suspended guiding section 19 air stream(s) first area 21 second area 22 gap (air flow-off zone) 23 dash-dot-line(s) 24 solid line
A-1402 08.09.95 - 1 - untmw.e Devlce for the Deceleration of Sheets The invention relates to a device for the deceleration of sheets, particularly for the delivery of a sheet-fed printing press, said device having at least one brake strap to which a suction device is assigned, said brake strap being connected with a driving facility which generates variable rotational speed.
A device having the aforementioned features is disclosed in DE 41 19 511 Al. The known brake strap co~prises an air-permeable rotary band to which is assigned a suction box.
The band is guided around three guide rolls, with preferably the intermediate roll being connected with a motor adapted for running with variable speed, in order to decrease the rotational speed of the band and to increase it again, whereby this speed decrease and increase takes place in accordance with the cycle of delivery of sheets to be decelerated. The known device is designed for decelerating unprinted sheets which are discharged especially from cross-cutting machines.
It is the object of the present invention to provide a device of the type mentioned above which is suitable for a smear-free deceleration of printed sheets, preferably in two-sided printing as well as in perfecting.
The object is solved in accordance with the invention, in that the brake strap comprises at least one discrete suction device rotating therewith and acting on a selective partial area of the sheet to be decelerated, and in that a section of the brake strap facing the respective re~; ni ng area of the sheet format has at least no active suction device. This kind of design permits the suction device only to act exactly on a selective partial area of the sheet to be decelerated, this ~ 2158388 A-1402 08.09.95 - 2 - untmw.e partial area preferably being the unprinted rear edge of the sheet. Thereby, it is ensured that the respective rem~; n; ng area of the sheet format is guided in contact-free manner, which means that, if printing ink is there, it cannot smear.
Since the suction device is strictly located in one or also in several places of the brake strap and the rem~;n;ng surface of the brake strap has no or no active suction device, it is ensured that the sheet area facing this rem~;n;ng surface of said brake strap cannot be sucked up and, thus, is not subjected to contact with the brake strap.
The brake strap is controlled or regulated through the driving facility in such a way that always the selectable partial area of the sheet to be decelerated comes in contact with the suction device.
It is especially provided that the suction device has at least one suction opening which is partially formed at the brake strap. However, it is also feasible that, for example, one row of suction-openings is formed at the brake strap transversely to its rotational direction. Furthermore, it is feasible that several suction devices of this type of design or also another design are arranged in spaced relation over the length of the brake strap, so that per sheet to be decelerated the brake strap does not perform a full but a partial revolution.
Preferably, the suction device comprises at least one suction element extending outwardly and rising above the outer contour of the brake strap, particularly a suction cam or a suction bar. This type of design is especially advantageous, as the sheet moving over the suction device keeps a relative distance from the outer contour, due to the suction elements extending outwardly and rising above the outer contour, so that contact and, thus, smearing is prevented with certainty.
In the case of a design of the suction element as suction bar, such suction bar extends transversely to the rotational ~ 215838~
A-1402 08.09.95 - 3 - untmw.e direction of the brake strap and has a suction opening or multiple suction openings (preferably in a row) on its top side.
In accordance with a further development of the invention there is provided that the driving facility causes the brake strap to have a speed in correspondence with the sheet speed while the sheet rear edge is sucked up. Thus, the suction device and the sheet rear edge move at the same speed, that is, in synchronism with one another at the moment of sucking.
Furthermore, there is provided that after the sheet rear edge has been sucked up the driving facility decreases the rotational speed of the brake strap. In this way damage-free deposit of the sheets on a pile of sheets can take place.
Particularly, there is provided that the driving facility is an electric servomotor. Preferably, the servomotor is of a type which allows for very strong and quick acceleration and deceleration. For example, such a motor can drive directly -that is, without the intermediary o~ gearing - respective guide rolls of the brake strap.
In accordance with another development of the invention, a suspended guiding system for the sheet is assigned to the brake strap. By means of suspended guidance the sheet is guided contact-free to the brake strap and then sucked up at its rear edge and decelerated. Thereby, the sheet is preferably transported by a gripper system, the grippers of which being opened as soon as the rear edge of the sheet has been picked up.
Preferably, suspended guiding sections of the suspended guiding system are arranged in front of the brake strap, as seen in sheet-travel direction. It is advantageous to have at least one suspended guiding section of the suspended guiding system arranged laterally of the brake strap, whereby with 215~38~
A-1402 08.09.95 - 4 - untmw.e "lateral" a direction is meant which extends transversely to the sheet travel direction.
In particular, there can be provided that multiple brake straps are arranged at a lateral distance from one another.
These brake straps, thus, form a brake strap array extending over the sheet width, so that the rear edge of the sheet is contacted by multiple brake straps. Especially, there may be provided a respective suspended guiding section between the brake straps, as described above.
In accordance with a preferred embodiment of the invention there is provided that the suspended guiding system assigned to the brake strap comprises a plurality of air nozzles with streams of air emerging therefrom and creating a layer of carrying-air which enables the contact-free guidance of the sheets. Hereby, there may be provided that the air streams in a first area are directed contrary to the sheet travel direction and the air streams in a second area are directed towards the sheet travel direction. Between said two areas there can pre~erably be created an air ~low-off zone which, for example, may be in the form of a gap extending over the width of the sheet transport path, so that the carrying-air streams coming from both areas move towards the gap and are conducted away through it.
Finally, said first area is located downstream with respect to said second area, as seen in sheet travel direction.
Furthermore, it is preferably provided that a brake band forming the brake strap is in form-locking operative connection with the servomotor.
The invention will be best understood upon reading the following description of preferred embodiments in view of the accompanying drawings, wherein A-1402 08.09.95 - 5 - untmw.e Fig. 1 is a schematic side view of a device for the deceleration of sheets in a first mode of operation;
Fig. 2 shows the device of Fig. 1 in a further mode of operation - without driving facility;
Fig. 3 shows the device of Fig. 1 in a yet further mode of operation - without driving facility;
Fig. 4 is a top view of the device as shown in Fig. 1;
Fig. 5 is a diagram illustrating a section of the timing course of speed of the brake band in an exemplary embodiment;
Fig. 6 is a diagram of the timing course of the speeds of sheets on the one hand (dash-dot-line) and of the brake band on the other hand (solid line) during two consecutive cycles, during which two consecutive sheets are received by the suction device and decelerated; and Fig. 7 is a diagram of the timing course of the speeds of two consecutive sheets on the one hand (dash-dot-line) and of the brake band on the other hand (solid line) in different consecutive modes of operation of a device in accordance with the invention.
Fig. 1 shows a device 1 for decelerating sheets 2, wherein a respective sheet 2 is initially moved across the device 1 a certain stretch by means of a gripper system 9 and is then released from the gripper system 9, as explained in detail hereinafter. The device 1 comprises a brake strap 3 which is wound around two guide rolls 4, at least one of said guide rolls 4 being in operative connection with a driving facility A-1402 08.09.95 - 6 - untmw.e which is in the form of a servomotor M. The brake strap 3 is formed by means of a brake band 5 (suction band) which is caused by the driving facility to revolve at varying rotational speed in the direction of the arrow 6. Between the two guide rolls 4 there is a suction box 7 which is connected to a vacuum source not illustrated herein.
The brake band 5 has a discrete suction device 8 which revolves with the brake band 5. "Discrete" has the meaning that the suction device 8 is located well-aimed on a certain place on the brake band 5, so that at least sections of the brake strap 3 formed by means of the brake band 5 do not have a suction device 8 or at least not an active suction device 8. "Not active" means that a sheet 2 located above the device 1 is not sucked up. When a sheet 2 is moved over the device 1 in the direction of an arrow 10 by means of a gripper system 9 which grips the front edge of the sheet 2, a synchronisation with the suction device 8 takes place in a manner that the sheet rear edge 11 is sucked up. At the moment of suction the suction device 8 and the sheet 2 move at equal speed, that is to say, there is no relative speed in the direction of the arrow 10 between the sheet 2 and the brake band 5. The grippers of the gripper system 9 open as soon as the sheet is sucked up, so that the sheet 2 is gripped in the region of its rear edge 11 and held by means of the suction device 8 and, due to a delayed motion of the brake band 5, is decelerated and subsequently delivered to a sheet pile 12 at decreased speed in a manner that no damage to the sheet 2 does occur. Above the sheet pile 12 may be provided an arrangement for generating blowing air, in order to facilitate deposit of the sheets. The direction of the blowing air is indicated by arrows 13.
In Fig. 1 can be seen that not only one suction device 8 but, for example, two or more suction devices 8 may be assigned to the brake band 5, so that during one revolution of the brake ~158388 A-1402 08.09.95 - 7 - untmw.e strap 3 a respective number of sheets 2 can be decelerated.
The suction devices 8 cooperate with the suction box 7 while they are passing over it, so that the vacuum existing in the suction box 7 will be effective on the sheet 2.
There may particularly be provided that the suction device 8 is designed as a suction bar extending transversely to the direction of rotation of the brake strap 3, said suction bar having a suitable array of suction openings on its top side, which cooperate with the rear edge 11 of a respective sheet 2.
Fig. 2 illustrates the device of Fig. 1 with the gripper system 9 having operationally moved further, that is, the preceding sheet 2 is still held at its rear edge 11 by the suction device 8 while the succeeding sheet 2 is already sectionally located above the device 1 but is not sucked up as yet. A sheet is sucked up only when the rear edge 11 of a succeeding sheet 2 is positioned opposite a suction device 8.
Thereby, a smear-free deceleration of the sheet 2 is ensured.
Fig. 3 shows the device of Fig. 1 in a mode of operation wherein the above mentioned succeeding sheet 2 has already partially been transported over the sheet pile 12.
Fig. 4 shows a top view of the device 1 having multiple brake straps 3 which are arranged transversely to the sheet travel direction 14 in spaced relation to one another. Thereby, an array of side-by-side brake straps 3 is formed, said brake straps 3 moving at varying rotational speed in synchronism with one another, so that sheet deceleration can take place as described above. Fig. 4 shows a part of a sheet 2, whereof the rear edge 11 has already been released by the brake straps 3. Thus, the speed of the sheet 2 has already been decreased, so that it can be deposited on the sheet pile 12.
Laterally of the outer brake straps 3 as well as between the ~ 2158388 A-1402 08.09.95 - 8 - untmw.e individual brake straps 3 suspended guiding sections 15 are formed. These are complemented by a further suspended guiding section 16 arranged in front of the brake straps 3, as viewed in sheet travel direction. Adjacent thereto there is an air flow-off zone 17 and a further suspended guiding section 18, as viewed contrary to the sheet travel direction 14. The suspended guiding sections 16 and 18 as well as the suspended guiding sections 15 include a plurality of air nozzles not shown in the drawings, with air streams 19 emerging therefrom which, together, form a layer of carrying-air whereon the sheets 2 can be transported in suspended manner. The suspended guiding sections 15 and the suspended guiding section 16 form a first area 20 wherein the air streams 19 are directed contrary to the sheet travel direction 14. The tightening or stretching of the sheet 2 achieved thereby has an advantageous effect on the moving behavior of the respective sheet rear edge 11 in that it facilitates accurate and defined picking-up of said sheet rear edge 11 by the suction device 8. The suspended guiding section 18 forms a second area 21 wherein the air streams 19 have the direction of the sheet travel direction 14. Consequently, the air streams 19 of the first and second areas 20 and 21 directed towards one another meet in the air flow-off zone 17 which is preferably designed as a gap 22 extending over the entire width of the guiding path for the sheets 2.
Due to the layer of carrying-air formed by the air streams 19, the respective sheet 2 - the front edge of which being gripped by grippers of the gripper system 9 - is moved contact-free over the brake straps 3 in a manner that, on passing, the sheet rear edge 11 is picked up by the suction devices 8 located on the brake straps 3.
Through a decrease in rotational speed of the brake strap 3 the speed of the sheet 2 is decreased while the sheet rear edge 11 is held by the suction devices 8 of said brake A-1402 08.09.95 - 9 - untmw.e strap 3, so that deposit of the sheet 2 can take place on the sheet pile 12 without damage or smearing of said sheet 2.
Appropriate variable rotational speeds of the brake straps 3 are generated by means of a driving facility, preferably in the form of a servomotor M.
Fig. 5 shows a section of the timing course of the speed v in m/s of the suction devices 8 of the brake straps 3 of an exemplary embodiment. It can be seen that initially a relatively low speed v is used which increases, starting at the point of time tl and reaches a highest value at the point of time t2, then it r~m~; n.~ constant up to the point of time t3. From there the speed v is decreased again up to the point of time t4 and reaches the same value as at the point of time tl. In the span of time t2 - t3 a sheet take-over takes place, that is to say, in this span of time the suction devices 8 of the brake straps 3 have a high speed v which equal to the speed v of the sheet 2. With the sheet rear edge 11 subsequently being held by the suction devices 8, the deceleration motion (span of time t3 - t4) takes place, whereby the sheet 2 is decelerated to the speed of the point of time t4. After the point of time t4 the sheet 2 is released and, thus, deposited on the sheet pile 12.
Subsequently, an acceleration takes place again - as at the point of time tl -, and the next sheet 2 is sucked up at an initially high speed and then decelerated.
Fig. 6 shows a diagram wherein, aside from the timing course of the speed of the brake band 5 indicated by a solid line 24, there is additionally indicated by dash-dot-lines 23 the course of speed of two successive sheets 2 within the range of the device 1 in accordance with the invention.
Actually, the lines 23 coincide with line 24 in their respective upper level, in their descending branches and in respective sections of their lower level. For reasons of clarity, however, a manner of illustration has been chosen 215838~
A-1402 08.09.95 - 10 - untmw.e which deviates therefrom. Particularly at the moment of sheet take-over by the suction device 8 or one of the suction devices 8, i.e. when the sheet rear edge 11 is sucked up (point of time t5 in Fig. 6), the speed of the sheet 2 and that of the suction device 8 are e~ual. By decreasing the speed of the suction device 8 the speed of the sheet 2 is equally decreased. A respective end of the lines 23 (point of time t6, t6') located on the lower level is synonymous with a release of the respective sheet 2 taking place on the part of the device 1. This release has the result that the sheet 2 leaves the device 1 at a now decreased speed and deposits itself on the sheet pile 12 in the course of its further movement. The start of line 23 shown to the right in Fig. 6 (point of time t7) is synonymous with the entry into the range of the device 1 of a successive sheet 2 which follows a decelerated sheet 2, in order to then be picked up by the suction device 8 or one of the suction devices 8 at the point of time t5' and to be released again at the point of time t6'. The spans of time between t5 and t5' or between t6 and t6' correspond with the time cycle at which the consecutive sheets 2 are conveyed into the range of the device 1 by means of a respective gripper system 9.
For the realization of the mode of operation of periodically picking-up a sheet 2 by means o~ a suction device 8 at corresponding speeds of sheet 2 and suction device 8, the subsequent joint deceleration and the release of the respective decelererated sheet 2 on the part of the suction device 8, as shown in Fig. 6 by means of a speed diagram, the phase position of the suction device 8 revolving with the brake band 5 is chosen such, that a suction device 8 faces a respective sheet 2 for the first time when it has reached the speed of the not decelerated sheet 2, and that after release of the sheet 2 (point of time t6 or t6') said suction device 8 faces away from a conveying surface passed by successive sheets 2. Of course, this will be true for an A-1402 08.09.95 untmw.e t arrangement of one suction device 8 at an individual position along the brake band 5 or multiple suction devices 8 in spaced apart positions along the brake band 5.
Fig. 7 illustrates a mode of operation for a first sheet, namely "inspection sheet removal" which, in view of the use of a device 1 according to the invention in a delivery of a sheet-fed printing press, can also be realized with said device 1, and the mode of operation for a successive second sheet 2 as described hereinabove, in short called "braking cycle", for depositing this sheet 2 on a sheet pile 12 at a decreased speed resulting from the respective existing speeds of sheet 2 (line 23') on the one hand and of the brake band 5 (line 24') on the other hand. As already explained in connection with Fig. 6, here, too, the lines 23' and 24' coincide in some areas, which is not shown in the drawings, thus, in the same areas as in the mode of operation according to Fig. 6. In the mode of operation "inspection sheet removal" the brake band 5 is controlled in a manner that during a complete time cycle (equal to a span o~ time between t6 and t6') no suction device 8 is facing a sheet 2 conveyed over the device 1 by means of a gripper system 9. Also, this mode of operation does not have the requirement of release of the sheet on the part of the gripper system 9 as soon as the point of time t5 indicated in Fig. 7, and corresponding to that in Fig. 6, is reached. The sheet 2 can rather be conveyed further individually and also beyond the sheet pile 12 to be fed to an inspection station.
The quantitative values given in Fig. 5 in association with the diagram of Fig. 7 make clear the special advantages of a device 1 in accordance with the invention, being equipped with an electric servomotor. These advantages are to be seen in the fact that it merely takes suitable electric control means to fulfill the function of deceleration of the sheet 2 at a fast rate of succession of sheets 2 in accordance with ;~1583~8 A-1402 08.09.95 - 12 - untmw.e the time cycles of modern sheet-fed printing presses on the one hand, and to stop said deceleration during a respective single chosen machine cycle on the other hand.
For the realization of the course of movement of the brake band 5 as illustrated in the diagrams, said brake band 5 is in form-locking operative connection with the servomotor M.
In the present exemplary embodiment the driving facility as schematically illustrated in Fig. 1, as well as the guide rolls 4 and the brake band 5 are designed as a cogged belt drive.
The control of the servomotor preferably takes place in a manner that the sheet deposit speed rem~' ns constant, even when speed variations in the printing process or the like occur.
By means of the device in accordance with the invention the sheet is taken over at defined spots, then decelerated and deposited. Thereby, the gripper-opening motion is coordinated with the brake band control. The sheet deposit achieved by a controlled suction cam contributes considerably to an an operationally stable and defined formation of a sheet pile with edges being accurately aligned.
A-1402 08.09.95 untmw.e LIST OF REFERENCE NUMERALS
1 device for deceleration of sheets 2 sheet(s) 3 brake strap(s) 4 guide rolls brake band 6 arrow 7 suction box 8 suction device 9 gripper system arrow 11 sheet rear edge 12 sheet pile 13 arrow 14 sheet travel direction suspended guiding section(s) 16 suspended guiding section 17 air flow-off zone 18 suspended guiding section 19 air stream(s) first area 21 second area 22 gap (air flow-off zone) 23 dash-dot-line(s) 24 solid line
Claims (17)
1. Device for the deceleration of sheets, particularly for the delivery of a sheet-fed printing press, said device having at least one brake strap to which a suction device is assigned, said brake strap being connected with a driving facility which generates variable rotational speed, c h a r a c t e r i z e d in that the brake strap (3) comprises at least one discrete suction device (8) revolving with said brake strap (3), said suction device (8) acting on a selective area of the sheet to be decelerated (2), and that a section of the brake strap (3) facing a respective remaining area of the sheet (2) has at least no active suction device (8).
2. Device in accordance with claim 1, c h a r a c t e r i z e d in that the suction device (8) has at least one suction opening being partially formed at the brake strap (3).
3. Device in accordance with at least one of the preceding claims, c h a r a c t e r i z e d in that said suction device (8) comprises at least one suction element extending outwardly and rising above the outer contour of the brake strap (3), particularly a suction cam or a suction bar.
4. Device in accordance with at least one of the preceding claims, c h a r a c t e r i z e d in that the driving facility imparts a speed to the brake strap (3) corresponding to the speed of the not decelerated sheet while the sheet rear edge (11) is sucked up.
5. Device in accordance with at least one of the preceding claims, c h a r a c t e r i z e d in that after the sheet rear edge (11) is sucked up, the driving facility decreases the rotational speed of the brake strap (3).
6. Device in accordance with at least one of the preceding claims, c h a r a c t e r i z e d in that the driving facility is an electric servomotor (M).
7. Device in accordance with at least one of the preceding claims, c h a r a c t e r i z e d in that a suspended guiding system (15, 16, 18) for the sheet (2) is assigned to the brake strap (3).
8. Device in accordance with claim 7, c h a r a c t e r i z e d in that suspended guiding sections (16, 18) of the suspended guiding system (15, 16, 18) are located in front of the brake strap (3), as seen in sheet travel direction (14).
9. Device in accordance with claim 7, c h a r a c t e r i z e d in that at least one suspended guiding section (15) of the suspended guiding system is arranged laterally of the brake strap (3).
10. Device in accordance with at least one of the preceding claims, c h a r a c t e r i z e d in that there are arranged multiple brake straps (3) at a lateral distance from one another.
11. Device in accordance with claim 10, c h a r a c t e r i z e d in that suspended guiding sections (15) are arranged between the brake straps (3).
12. Device in accordance with claim 7, c h a r a c t e r i z e d in that the suspended guiding system (15, 16, 18) assigned to the brake strap (3) comprises a plurality of air nozzles with air streams (19) emerging therefrom which create a layer of carrying-air.
13. Device in accordance with claim 12, c h a r a c t e r i z e d in that the air streams (19) in a first area (20) are directed contrary to the sheet travel direction (14)
14. Device in accordance with claim 12, c h a r a c t e r i z e d in that the air streams (19) in a second area (21) are directed towards the sheet travel direction (14).
15. Device in accordance with claims 13 and 14, c h a r a c t e r i z e d in that between the two areas (20, 21) there is created an air flow-off zone (17).
16. Device in accordance with claims 13 and 14, c h a r a c t e r i z e d in that the first area (20) is located downstream and opposite to the second area (21), as seen in sheet travel direction (14).
17. Device in accordance with claim 6, c h a r a c t e r i z e d in that a brake band (5) forming the brake strap (3) is in form-locking operative connection with the servomotor (M).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19944435988 DE4435988A1 (en) | 1994-10-08 | 1994-10-08 | Device for braking sheets |
| DEP4435988.8 | 1994-10-08 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2158388A1 true CA2158388A1 (en) | 1996-04-09 |
Family
ID=6530271
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002158388A Abandoned CA2158388A1 (en) | 1994-10-08 | 1995-09-15 | Device for the deceleration of sheets |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0706966A1 (en) |
| JP (1) | JPH08113406A (en) |
| CN (1) | CN1129189A (en) |
| CA (1) | CA2158388A1 (en) |
| DE (1) | DE4435988A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9533489B2 (en) | 2013-09-23 | 2017-01-03 | Tresu A/S | Apparatus for register control and a method for regulating such apparatus |
Families Citing this family (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19620938C2 (en) * | 1996-05-24 | 2002-01-24 | Heidelberger Druckmasch Ag | Process for the smear-free depositing of printed sheets on a stack |
| DE19914177A1 (en) | 1999-03-29 | 2000-10-05 | Heidelberger Druckmasch Ag | Boom of a sheet-fed printing machine |
| DE10049181B4 (en) | 1999-11-05 | 2014-12-18 | Heidelberger Druckmaschinen Ag | Device for removing sample and defect sheets from a sheet-processing machine |
| DE19960351A1 (en) * | 1999-12-14 | 2001-06-21 | Heidelberger Druckmasch Ag | Sheet braking system for a boom of a sheet processing machine |
| DE10107716A1 (en) * | 2000-03-30 | 2001-10-04 | Heidelberger Druckmasch Ag | Sheet braking device for printing machine has several braking modules having individual drives and drive controls for providing velocities at fixed ratio to machine velocity |
| DE10348827A1 (en) | 2002-10-31 | 2004-05-13 | Heidelberger Druckmaschinen Ag | Braking mechanism for the sheets output from a sheet processing machine, especially an offset sheet printer, comprises one or more brake shoes that are cyclically moved to and fro over a sheet guiding surface |
| DE10353635A1 (en) | 2002-12-12 | 2004-07-01 | Heidelberger Druckmaschinen Ag | Paper processing machine has overriding clutch in drive connection and brake to decelerate braking element, whereby braking element has suction box with braking surface with suction holes brushed over by braking run of suction belt |
| JP4776887B2 (en) * | 2003-10-29 | 2011-09-21 | ハイデルベルガー ドルツクマシーネン アクチエンゲゼルシヤフト | Method and apparatus for eliminating lateral slack in printed sheet |
| CN1854045B (en) * | 2005-04-28 | 2010-04-14 | 海德堡印刷机械股份公司 | Sheet delivering apparatus with sheet brake for a printer and the printer |
| DE102006015578B4 (en) | 2005-04-28 | 2022-11-10 | Heidelberger Druckmaschinen Ag | Sheet brake of a printing press |
| US8025291B2 (en) * | 2006-01-10 | 2011-09-27 | Goss International America, Inc. | Signature velocity reduction device and method |
| WO2009143530A1 (en) * | 2008-05-23 | 2009-11-26 | Goss International Americas, Inc. | A method and device for a combined signature diverter and slowdown device |
| DE102008042902B4 (en) | 2008-10-16 | 2023-03-23 | Koenig & Bauer Ag | Sheet brake of a printing press and method for driving a sheet brake |
| DE102008042901A1 (en) | 2008-10-16 | 2010-04-22 | Koenig & Bauer Aktiengesellschaft | Paper sheet brake for paper sheet rotation printing machine, has brake bands for slowing down paper sheet, where suction rings and brake bands are successively arranged in paper sheet running direction |
| DE102008042898B4 (en) | 2008-10-16 | 2024-05-23 | Koenig & Bauer Ag | Sheet brake of a sheet processing machine, especially a printing press |
| DE102009001143A1 (en) | 2009-02-25 | 2010-08-26 | Koenig & Bauer Aktiengesellschaft | Sheet tightening device for use in delivery device of bend-processing machine such as sheet-processing rotary printing press, has guide roller assigned to pressure disk such that sheet is jammed between roller and disk during transport |
| DE102017221218A1 (en) | 2017-11-27 | 2019-05-29 | Koenig & Bauer Ag | Sheet processing machine |
| CN112607486A (en) * | 2020-12-28 | 2021-04-06 | 滁州卷烟材料厂 | Conveyer is used in corrugated paper processing |
| DE102021102597A1 (en) | 2021-02-04 | 2022-08-04 | Koenig & Bauer Ag | Method for operating a delivery of a sheet processing machine with a sheet brake |
| DE102021115291A1 (en) | 2021-06-14 | 2022-12-15 | Koenig & Bauer Ag | Method for operating a delivery of a sheet processing machine with a sheet brake and delivery |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3735976A (en) * | 1971-11-12 | 1973-05-29 | Rca Corp | Document picker |
| DE2523430C3 (en) * | 1975-05-27 | 1980-03-06 | Vits-Maschinenbau Gmbh, 4018 Langenfeld | Device for stacking sheets conveyed one behind the other at intervals |
| DE2755160C3 (en) * | 1977-12-10 | 1980-11-06 | Jagenberg-Werke Ag, 4000 Duesseldorf | Device for decelerating and overlapping sheets or sheets of sheets to be deposited as a stack on a tray |
| DE3040021A1 (en) * | 1980-10-23 | 1982-05-13 | Windmöller & Hölscher, 4540 Lengerich | DEVICE FOR FORMING AND STACKING SECTIONS SEPARATED FROM A FILM TUBE |
| DE3634400A1 (en) * | 1986-10-09 | 1988-04-14 | Heidelberger Druckmasch Ag | BOW BOOM ON ROTARY PRINTING MACHINES |
| DE3836254C1 (en) * | 1988-10-25 | 1990-05-10 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg, De | |
| DE9007362U1 (en) * | 1990-01-26 | 1991-05-02 | Heidelberger Druckmaschinen Ag, 6900 Heidelberg | Sheet delivery on rotary printing presses |
| DE9103138U1 (en) * | 1991-03-15 | 1991-07-18 | Georg Spiess Gmbh, 8906 Gersthofen | Device for pulling transport of flat objects |
| DE4119511A1 (en) | 1991-06-13 | 1992-12-17 | Jagenberg Ag | DEVICE FOR BRAKING DOWN SHEETS TO BE PUT ON A PACK, IN PARTICULAR PAPER OR CARDBOARD SHEETS |
| DE4139888A1 (en) * | 1991-12-04 | 1993-06-09 | Jagenberg Ag, 4000 Duesseldorf, De | DEVICE FOR BRAKING DOWN SHEETS TO BE PUT DOWN ON A PACK, IN PARTICULAR PAPER OR CARDBOARD SHEETS |
| DE4201411A1 (en) * | 1992-01-21 | 1993-07-22 | Blohm Voss Ag | Hold down for flat thin paper sheets on processing machines - has perforated endless belt set close in front of delivery station |
-
1994
- 1994-10-08 DE DE19944435988 patent/DE4435988A1/en not_active Withdrawn
-
1995
- 1995-09-14 EP EP95114430A patent/EP0706966A1/en not_active Withdrawn
- 1995-09-15 CA CA002158388A patent/CA2158388A1/en not_active Abandoned
- 1995-10-09 JP JP26167995A patent/JPH08113406A/en active Pending
- 1995-10-09 CN CN 95117950 patent/CN1129189A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9533489B2 (en) | 2013-09-23 | 2017-01-03 | Tresu A/S | Apparatus for register control and a method for regulating such apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0706966A1 (en) | 1996-04-17 |
| DE4435988A1 (en) | 1996-04-11 |
| CN1129189A (en) | 1996-08-21 |
| JPH08113406A (en) | 1996-05-07 |
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Legal Events
| Date | Code | Title | Description |
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| EEER | Examination request | ||
| FZDE | Dead |