EP0658425B1 - Appareille de transfert de feuilles pour une machine à imprimer - Google Patents

Appareille de transfert de feuilles pour une machine à imprimer Download PDF

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Publication number
EP0658425B1
EP0658425B1 EP19940109204 EP94109204A EP0658425B1 EP 0658425 B1 EP0658425 B1 EP 0658425B1 EP 19940109204 EP19940109204 EP 19940109204 EP 94109204 A EP94109204 A EP 94109204A EP 0658425 B1 EP0658425 B1 EP 0658425B1
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EP
European Patent Office
Prior art keywords
gear
rotating member
sheet
printing
drive gear
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.)
Expired - Lifetime
Application number
EP19940109204
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German (de)
English (en)
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EP0658425A1 (fr
Inventor
Masaharu Okuda
Haruki Umemura
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Sakurai Graphic Systems Corp
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Sakurai Graphic Systems Corp
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Publication date
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Publication of EP0658425A1 publication Critical patent/EP0658425A1/fr
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Anticipated expiration legal-status Critical
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F13/00—Common details of rotary presses or machines
    • B41F13/008—Mechanical features of drives, e.g. gears, clutches
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41F—PRINTING MACHINES OR PRESSES
    • B41F21/00—Devices for conveying sheets through printing apparatus or machines
    • B41F21/10—Combinations of transfer drums and grippers
    • B41F21/106—Combinations of transfer drums and grippers for reversing sheets, e.g. for perfecting machine
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41P—INDEXING SCHEME RELATING TO PRINTING, LINING MACHINES, TYPEWRITERS, AND TO STAMPS
    • B41P2213/00—Arrangements for actuating or driving printing presses; Auxiliary devices or processes
    • B41P2213/10—Constitutive elements of driving devices
    • B41P2213/20—Gearings
    • B41P2213/208—Harmonic drive

Definitions

  • the present invention relates to a sheet transferring apparatus employed for an offset press, and more particularly to a sheet transferring apparatus for transferring a sheet between a plurality of printing units so as to perform a multiple color press on a single surface of this sheet or a single color press on both surfaces of this sheet.
  • An offset press is capable of multi-color printing and also well suited for mass printing.
  • Sheet-fed printers to which printing paper sheets of the same size are fed one by one to carry out printing, are widely employed in such offset press. In a mode where printing is to be applied on both surfaces of the sheet (double-side printing) is to be carried out in such type of sheet-fed printer, the sheet must be reversed and transferred.
  • the offset press is provided with a feed cylinder 100 and a transfer cylinder 101, with a supply cylinder 102 being disposed between and adjacent to these cylinders 100 and 101.
  • the supply cylinder 102 has a diameter twice as great as those of the other cylinders 100,101.
  • the printing sheet Pa subjected to a first printing is forwarded from the impression cylinder (not shown) to the feed cylinder 100 with the printed surface facing toward the cylinder 100.
  • the sheet Pa retained on the transfer cylinder 100 is grasped at its front edge by the grippers of the supply cylinder 102 and shifted to the outer surface thereof.
  • the sheet Pa is retained on the supply cylinder 102 with the printing surface facing outward.
  • a mode where printing is to be applied on a single surface with two colors is to be carried out, as shown in Fig. 13(a)
  • the front edge of the printing sheet Pa retained on the supply cylinder 102 is grasped by a plurality of holders 103 arranged in the axial direction of the transfer cylinder 101.
  • the sheet is reversed and then fed to the transfer cylinder 101 with the printed surface facing inward.
  • the rear edge of the printing sheet Pa retained on the supply cylinder 102 with the printed surface facing outward is grasped by the holders 103 and fed to the transfer cylinder 101 in the same posture, as shown in Fig. 13(b).
  • the holders 103 of the transfer cylinder 101 must grasp the rear edge of the printing sheet Pa.
  • the phase of the transfer cylinder 101 relative to the supply cylinder 102 must be adjusted so as to allow the holders 103 to securely grasp the sheet Pa.
  • phase adjustment of the reversing mechanism at switching between single-side printing and double-side printing has conventionally been carried out by changing the phase of the input gear 104 and that of the output gear 105, which transmit the driving force of the main motor, as shown in Fig. 14. Namely, the bolts 106 fastening the input gear 104 are loosened to turn the input gear 104 according to the scale. The phase of the input gear 104 is adjusted such that the holders 103 of the transfer cylinder 101 may securely grasp the rear edge of the printing sheet Pa.
  • the press of this prior application has a shaft penetrating a transfer cylinder, with an output gear being fitted on the shaft.
  • An input gear is connected to the output gear via a decelerator, and the driving force of a main motor is transmitted from the input gear through the decelerator to the output gear.
  • the decelerator has a rotary shaft at the center, and the relative positions of the input gear and output gear are designed to be adjusted by turning the rotary shaft. Namely, the phase of the input gear and that of the output gear are decided depending on the number of turning of the rotary shaft.
  • the detection signal of the sensor contains detection errors attributable to the resolving power or temperature characteristics of the sensor. Accordingly, it might happen that such detection errors bring about dislocation of the reference position in single-side printing, when the printing mode is switched from double-side printing to single-side printing. In multi-color printing, two or more printing processes are to be carried out based on the reference position. Accordingly, discrepancies may occur in the printed matter due to such misregistration.
  • GB-A-1,214,436 discloses a sheet transferring apparatus for transferring a sheet between a plurality of printing units including a transfer cylinder which is rotatably provided between adjacent units, a power source for actuating the transfer cylinder, a first rotating member mechanically connected with the power source and a second rotating member mechanically connected with the transfer cylinder.
  • the second rotating member is arranged to be driven by the first rotating member and printing operations on a single surface as well as on both surfaces of the sheet can selectively be performed.
  • a phase between the first rotating member and the second rotating member can be adjusted by means of a phase adjusting mechanism.
  • Both rotating members are formed as gears which are detachably connected with each other by means of a clamping ring and clamping screws.
  • the clamping screws For setting the machine to accommodate sheets of different lengths to be printed, it is necessary to release the clamping screws and thus enable the second gear to rotate freely relative to the first gear. If a rotation of the second rotating member relative to the first rotating member is desired for adjustment of this known machine, the clamping screws must be released to allow a relative rotation between both gears. After the machine has been appropriately adjusted, the second gear is clamped by tightening the clamping screws engaging the clamping ring, to the first rotating gear so as to rotate therewith.
  • bolts and stop members are provided, but not to stop a relative rotation between both rotating members during operation.
  • the purpose of these elements is to provide for a locating means which ensures an accurate and quick adjustment for multi-color printing and which ensures that both gears are located in contact without play. Therefore any setting of the known machine to accommodate sheets of a different length requires to release the clamping screws connecting both rotating members and to clamp together both rotating members by tightening the clamping screws after the desired adjustment was effected. This mechanism does not allow to carry out a quick and automatic adjustment of this known machine to accommodate sheets of a different length, if desired.
  • the present invention has been accomplished in view of these problems inherent in the prior art.
  • the invention provides for a sheet transferring apparatus for transferring a sheet between a plurality of at least two printing units, including a transfer cylinder rotatably provided between the adjacent units, a power source for actuating the transfer cylinder, a first rotating member mechanically connected with the power source, a second rotating member mechanically connected to the transfer cylinder, said second rotating member being arranged to be driven by the first rotating member, wherein printing operations on a single surface and on both surfaces of the sheet are selectively performed, and a phase between the first rotating member and the second rotating member is adjusted by a phase adjusting mechanism, and said sheet transferring apparatus further comprising stopping means formed with the first and the second rotating members, respectively, for stopping a relative rotation between the first and the second rotating members, detecting means for detecting a relative position of said first rotating member and said second rotating member, and halting means for halting the turning movement of said first rotating member before said stopping means abut against each other and restarts the turning movement of said first rotating member at a
  • the first rotating member includes a drive gear and the second rotating member includes a driven gear mating with the drive gear.
  • the drive gear is set at a reference position corresponding to a predetermined phase between the drive gear and the driven gear.
  • the stopping means includes a first stopper formed with the drive gear and a second stopper formed with the driven gear, the first stopper and the second stopper being arranged to abut against each other to stop relative rotation between the drive gear and the driven gear. This has the advantage to arrange the first stopper and the second stopper to abut against each other when the drive gear rotates to the reference position.
  • the sheet transferring apparatus is preferably provided with a main shaft rotatably supporting the transfer cylinder, a first gear secured to the main shaft for transmitting a driving force to the main shaft, a second gear engaged with the first gear so as to be able to undergo a phase change, means for controlling the phase of the second gear relative to the first gear in accordance with computed phases of the first and the second gears in accordance with the size of the sheet, means for braking rotation of the transfer cylinder under actuation of the control means, and stoppers disposed to the first gear and the second gear, respectively, said stoppers being to be abutted against each other so as to stop relative turning of the first gear and the second gear.
  • the sheet transferring apparatus allows the reference position registering mechanism to be constructed compactly and, thereby, to be disposed in a press without interfering with other members.
  • the stopping means to abut against each other at the end of the respective relative turning movement of the rotating members the registration accuracy of the respective reference position can be improved.
  • the slow turning movement of the first rotating member before abutment against the second rotating member weakens the impact when the stoppers abut against each other and, thereby, prevents reduction in the formation of the stoppers and assures accurate adjustment of the respective reference position. Also an automatic adjustment is possible.
  • the offset press shown in Fig. 1 is provided with first and second printing units 1, 2.
  • a feeder 3 is disposed adjacent to the first printing unit 1, while a delivery device 4 is disposed beside the second printing unit 2.
  • each printing unit 1, 2 an ink is fed to a plate cylinder 6 via ink distribution rollers 5, and water is also fed to the plate cylinder 6 via water distribution rollers 7. The ink and water are mixed on the plate cylinder 6. The mixture is transferred to a blanket cylinder 8a or 8b. A printing sheet Pa is fed from the feeder 3 via a sheet feeder 9 to an impression cylinder 10a.
  • FIG. 2 Motions of the respective cylinders in single-side two-color printing are shown in Fig. 2.
  • a printing sheet Pa which is retained on the circumference of a right impression cylinder 10a, is brought into contact with the circumference of the right blanket cylinder 8a to be subjected to a first color printing.
  • the blanket cylinder 8a is revolved as the impression cylinder 10a revolves to apply printing on the entire surface of the sheet Pa.
  • the thus printed sheet Pa is fed via a feed cylinder 11 to a supply cylinder 12 with the printed surface facing outward.
  • the sheet Pa is then grasped at the front edge thereof by a plurality of holders 14 arranged in the axial direction of the transfer cylinder 13.
  • the sheet Pa is fed to the transfer cylinder 13 with the printed surface facing inward.
  • the sheet Pa is then retained on the left impression cylinder 10b with the printed surface facing outward again to be subjected to a second color printing by a left blanket cylinder 8b.
  • These cylinders are revolved by a
  • the printing sheet Pa is likewise printed on one surface thereof by the blanket cylinder 8a and then forwarded to the supply cylinder 12 via the feed cylinder 11 with the printed surface facing outward, as shown in Fig. 3(a).
  • the front edge of the sheet Pa is grasped by grippers 16 of the supply cylinder 12 and retained on the circumference of the supply cylinder 12.
  • the holders 14 grasp the rear edge of the sheet Pa.
  • the holders 14 of the transfer cylinder 13 pivot counterclockwise so as not to crease the sheet Pa. As shown in Fig.
  • the rear edge of the sheet Pa is retained by the suction head 17 of the supply cylinder 12.
  • the supply cylinder 12 consists of a front and a rear segments 12a, 12b.
  • the segments 12a, 12b are designed to change the angle formed therebetween for accurately holding the rear edge of the sheet Pa by the suction head.
  • the front edge of the printing sheet Pa retained on the supply cylinder 12 passes the contact point between the cylinders 12 and 13, the rear edge of the sheet Pa is grasped by the holders 14 of the transfer cylinder 13.
  • the sheet Pa is fed to the transfer cylinder 13 with the printed surface facing outward, and then retained on the left impression cylinder 106 shown in Fig. 1 with the printed surface facing inward to be subjected to printing on the rear surface by the left blanket cylinder 8b.
  • the thus printed sheet Pb is forwarded to the delivery device 4 to complete printing.
  • phase adjustment of the transfer cylinder 13 in the above-described switching between "single-side two-color printing” and "double-side single-color printing” will be described. While such adjustment is performed by a control unit shown in Fig. 8, the details of the control unit will be described later.
  • a main shaft 24 is rotatably supported between frames 20, 21 by way of a pair of bearings 22, 23.
  • a pair of side plates 25a, 25b constitute the diaphragms of the transfer cylinder 13.
  • the diaphragms are fixed on the main shaft 24 at the positions inner than the frames 25a, 25b, respectively.
  • a plurality of guide pieces 26 are fixed onto the main shaft 24 at equal intervals between these side walls 25a, 25b. The circumferential surfaces of these guide pieces 26 guide the sheet Pa.
  • a cylinder groove is defined in the respective guide pieces 26.
  • a support member 56 is secured on the outer side of the frame 20 by way of a bracket 59.
  • a driven gear 27 is provided at one end portion of the main shaft 24 to be rotatable integrally therewith.
  • a drive gear 28 is attached to the driven gear 27 via Harmonic Differential Unit (a trademark; Harmonic Differential Co.) as a decelerator 29.
  • the drive gear 28 is rotatably supported via a bearing 61 on the support member 56.
  • the driving force of the main motor 15 is transmitted via a gear (not shown) to the drive gear 28.
  • the driving force is further transmitted from the drive gear 28 through the driven gear 27 to the rollers 5 of the second printing unit 2.
  • phase adjusting shaft 30 of the decelerator 29 protrudes from the outer surface of the support member 56.
  • the phases of the gears 27, 28 are adjusted by turning the phase adjusting shaft 30.
  • the adjusting shaft 30 is immobilized, so that transmission of the rotation of the drive gear 28 to the driven gear 27 is achieved at the ratio of 1 : 1.
  • a couple of gears 31, 32 is secured on the outer end portion of the adjusting shaft 30.
  • the gear 31 is fixed to the adjusting shaft 30 at an outer position.
  • the gear 32 is arranged next to the gear 31 and fixed by means of bolts 33 on the drive gear 28.
  • a locking electromagnetic clutch 35 is secured on the outer surface of the support member 56 by way of a bracket 60.
  • a gear 36 is fixed to the shaft 37 of the clutch 35 together with a gear 34.
  • the gear 34 is engaged with the gear 31 and connected to the shaft 37 of the gear 36 by way of the clutch 35.
  • the gear 36 is engaged with the gear 32 so as to prevent relative rotation between the gear 34 and the gear 36 while the clutch 35 is actuated.
  • the adjusting shaft 30 is retained as locked against the drive gear 28.
  • a phase control motor 41 drives the gear 31 connected to a shaft 42 of the motor 41 by way of gears 38, 39 and an electromagnetic clutch 40.
  • a gear 43 is fixed onto the shaft 42.
  • An encoder 45 is fixed to the member 56.
  • a gear 44 mounted on the shaft of the encoder 45 is engaged with the gear 43.
  • the revolution of the motor 41 is detected by this encoder 45.
  • the phases of two gear 27, 28 are detected in accordance with the revolution of the motor 41.
  • An electromagnetic brake 47 is secured to a bracket 46 extending from the frame 21, as illustrated in Fig. 5.
  • the brake 47 functions as the braking means for the transfer cylinder.
  • the electromagnetic brake 47 is fitted on the main shaft 24 for holding the shaft 24 unrotatable upon actuation of the brake 47.
  • a timing detector (resolver) 50 is mounted on the bracket 46.
  • the resolver 50 has a gear 49 and detects the actuating timing of the second unit.
  • the main shaft 24 is connected at its end to the timing detector 50 by way of a gear 48 mating the gear 49.
  • the reference position of the second unit 2 is detected by the timing detector 50.
  • Fig. 6 shows a cross section taken along Y-Y line in Fig. 7.
  • the drive gear 28 and the driven gear 27 have stoppers 51, 52, as the reference position registering mechanism, fastened by bolts 53, respectively.
  • the driven gear 27 is fixed to the main shaft 24.
  • the stoppers 51, 52 are arranged to be equally spaced from the axis of the main shaft 24 in such a way that the end faces of the stoppers 51, 52 may be abutted against each other at the reference position when the drive gear 28 is turned by the motor 41.
  • the reference position registering mechanism can be constructed compactly. This compact mechanism can be disposed in the press without interfering with other members. Further, as shown in Fig. 7, the stoppers 51, 52 are abutted against each other at the reference position (the stopper 52 as indicated by a fantom line). Accordingly, and when the drive gear 28 is turned, the driven gear 27 is pushed by the stoppers 51,52 to turn together with the drive gear 28.
  • a scale 54 for "single-side printing” and a paper size scale 55 for "double-side printing” are secured on the other surface of the gear 28.
  • Two scales 54, 55 have an arc shape and extend along the periphery of the gear 28
  • a reference position sensor 57 is attached via a bracket 58 to a free end of the support member 56 extended from the frame 20.
  • the sensor 57 detects the reference position of the gears 27, 28, where the abutment of two stoppers 51, 52 is taken place. While a proximity sensor is employed as the reference position sensor 57 in the preferred embodiment, other sensors can be also employed.
  • the sensor 57 is disposed to oppose to the center or therearound of the for the "single-side printing" scale 54 when the drive gear 28 is at the reference position.
  • the sensor 57 detects the "single-side printing" scale 54 and outputs a signal immediately before the gear 28 reaches the reference position.
  • control unit which performs mode switching and phase adjustment, is provided with two CPU (central processing units) 70, 71.
  • a display unit 72 is connected to the first CPU 70 for display.
  • the display unit 72 is provided with control switches or an input section including sheet size setter etc.
  • the control switches are arranged in the form of a touch panel. The smallest necessary number of switches on the screen is selected and operated.
  • the sheet size setter consists of ten keys provided on the display unit 72 and is used for inputting data indicative of the longitudinal size of the sheet Pa.
  • the display unit 72 has a function of a real-time-display relating to the progress of operation.
  • the display unit 72 has an alarm function for displaying malfunction such as failure.
  • the second CPU 71 is for use of controlling the electric members in the press.
  • a ROM (read only memory) 73 and a RAM (random access memory) 74.
  • a program for controlling the motions of the press is stored in the ROM 73.
  • the RAM 74 stores temporarily data in the course of computing operation etc.
  • an input/output unit (I/O) 75 is connected to the second CPU 71.
  • the phase control motor 41 is connected to the I/O unit 75 by way of a magnet 76, so that the revolution direction of the motor 41 is controlled.
  • a first unit timing detector 77 and a transfer cylinder maximum position sensor 78 are connected to the I/O unit 75.
  • the maximum position sensor 78 detects the transfer cylinder 13 to be at the maximum phase position where the phase between the reference position and current position of the cylinder 13 is maximum.
  • the electromagnetic brake 47, the electromagnetic clutch 40 and the locking electromagnetic clutch 35 are connected to the I/O unit 75.
  • the encoder 45 is also connected to the second CPU 71 via a counter 79.
  • a signal is transmitted from the CPU 71 via the I/O unit 75 to the brake 47 and the clutch 40. More specifically, the main shaft 24 is free from locking of the brake 47.
  • the clutch 40 allows the motor shaft 42 to mate the gear 39. Subsequently, a signal is transmitted from the CPU 71 via the I/O unit 75 to the motor 41.
  • the revolution of the motor 41 is transmitted via the gears 39, 38, 31 to the adjusting shaft 30. Since the electromagnetic clutch 35 is deactuated at this moment, the gears 31, 32 can rotate relative to each other. In accordance with this rotation, the phase of two gears 27, 28 are adjusted.
  • the revolution of the motor 41 is constantly detected by the encoder 45, and the signals from the encoder 45 are transmitted via the counter 79 to the CPU 71.
  • the clutch 40 is deactuated and the clutch 35 is actuated. If the main motor 15 is revolved in this state, the adjusting shaft 30 of the decelerator 29 receives a force to be rotated with respect to the drive gear 28 due to the load applied to the driven gear 27. However, since the electromagnetic clutch 35 is actuated, relative rotation of the gears 31, 32 is inhibited thereby, so that the shaft 30 is kept immobilized on the gear 28. In other words, the drive gear 28 is immobilized to the driven gear 27 to prevent induction of out-of-phase due to the load. It should be noted here that the electromagnetic clutch 40 is deactuated, so that the extra load is not applied to the rotation of the gear 31 but the gears 38, 39 engaged with the gear 31 merely rotate.
  • phase adjustment of the gears 27, 28, namely transfer cylinder 13 will be described referring to the flow chart.
  • the proceeding of the flow chart is subject to the control of the second CPU 71 in accordance with the program in the ROM 73.
  • Step 1 When the control switch for mode switching is turned on (Step 1) as shown in Fig. 9, the CPU 71 calls a program for switching the printing mode (Step 2).
  • the CPU 71 determines the current printing mode (Step 3). Namely, when the current mode of the press is "the single-side two-color printing mode", the mode is switched to the "double-side single-color printing mode" (A).
  • the CPU 71 further determines whether the sheet size should be changed (Step 4).
  • the mode is switched to the sheet size change mode (B), whereas when the sheet size is not to be changed, the "double-side single-color printing mode" is changed to the “single-side two-color printing mode” (C).
  • Phase adjustment of the transfer cylinder 13 is performed when the "single-side two-color printing mode" is changed to the "double-side single-color printing mode”. This adjustment process represented by (A) will be described referring to the flow chart shown in Fig. 10.
  • Step 5 When the data indicative of the sheet size is input using the ten keys of the display unit 72 (Step 5), the angle between the front and rear segments 12a, 12b of the supply cylinder 12 is adjusted in accordance with the sheet size (Step 6).
  • the main motor 15 is then driven (Step 7).
  • the transfer cylinder 13 is turned to a predetermined position based on the signal of the second unit timing detector 50 (Step 8).
  • the electromagnetic brake 47 is actuated upon stopping of the main motor 15 to lock the transfer cylinder 13 (Step 9).
  • the electromagnetic clutch 40 for adjusting phase is deactuated and the other electromagnetic clutch 35 for locking is actuated.
  • the clutch 40 is actuated and the clutch 35 is deactuated.
  • the motor 41 is driven (Step 10).
  • the driving operation of the motor 41 opens the transfer cylinder 13 to the maximum phase position where the position sensor 78 outputs a signal.
  • the transfer cylinder 13 is kept in such state (Step 11).
  • phase control motor 41 is driven (Step 12).
  • the phase of the transfer cylinder 13 is adjusted to conform to the desired sheet size based on the signal transmitted from the encoder 45 (Step 13). Since the electromagnetic brake 47 is actuated to lock the transfer cylinder 13, the rotation of the respective cylinders in the second printing unit is prevented, enabling accurate phase adjustment of the transfer cylinder 13.
  • Step 14 When the data representing of the sheet size is input using the ten keys of the display unit 72 (Step 14), the angle between the front and rear segments 12a, 12b of the supply cylinder 12 is adjusted so as to conform to the sheet size, and these segments 12a, 12b are locked by a segment lock pin which is not shown (Step 15).
  • the main motor 15 is then started (Step 16).
  • the brake 47 is actuated upon stopping of the main motor 15 to lock the transfer cylinder 13 (Step 18).
  • the clutch 40 for adjusting the phase is actuated, and the clutch 35 for locking operation is deactuated.
  • the transfer cylinder 13 is opened to the maximum phase position.
  • the CPU 71 determines the cylinder 13 is fully opened and keep the cylinder 13 is in this state (Step 20).
  • the control motor 41 is driven (Step 21). Therefore, the phase of the cylinder 13 is adjusted to conform to the desired sheet size in accordance with the signal from the encoder 45 (Step 22).
  • the electromagnetic clutch 40 is first actuated, and the locking electromagnetic clutch 35 is deactuated.
  • the control motor 41 is driven (Step 27)
  • the transfer cylinder 13 is turned close to the reference position in "single-side printing".
  • the reference position sensor 57 transmits a ON signal (Step 28)
  • the motor 41 is stopped (Step 29).
  • Step 30 the main motor 15 is slowly revolved (Step 30). This causes the drive gear 28 to start to rotate alone.
  • the stopper 51 of the drive gear 28 abuts against the stopper 52 of the driven gear 27, resulting in the driven gear 27 to rotate together with the drive gear 28.
  • the transfer cylinder 13 begins to rotate.
  • the locking clutch 35 is actuated to immobilize the phase between the gears 27, 28 (Step 32).
  • the state where the stopper 51 of the gear 28 abuts against the stopper 52 of the gear 27 corresponds to the reference position in "single-side printing", and the switching operation is completed by the series of procedures described above.
  • the two stoppers 51, 52 abut against each other at the reference position in the offset press according to the embodiment. Therefore, the registration accuracy of the reference position can be improved.
  • the drive gear 28 is turned slowly. This may weaken the impact when the stoppers 51, 52 abut against each other, preventing reduction in deformation of the stoppers 51, 52. Accordingly, the accurate registration of the reference position may be carried out.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Supply, Installation And Extraction Of Printed Sheets Or Plates (AREA)
  • Registering Or Overturning Sheets (AREA)
  • Discharge By Other Means (AREA)

Claims (5)

  1. Un dispositif de transfert de feuilles pour transférer une feuille (Pa) entre plusieurs unités d'impression (1, 2), comprenant un cylindre de transfert (13) monté en rotation entre les unités adjacentes, une source motrice (15) pour actionner le cylindre de transfert (13), un premier élément rotatif (28) relié mécaniquement à la source motrice (15), un second élément rotatif (27) relié mécaniquement au cylindre de transfert (13), lequel second élément rotatif (27) étant destiné à être entraíné par le premier élément rotatif (28), dans lequel des opérations d'impression sur une seule surface et sur les deux surfaces de la feuille (Pa) sont exécutées de façon sélective, et un décalage de phase entre le premier élément rotatif (28) et le second élément rotatif (27) étant réglé au moyen d'un mécanisme de réglage de phase (29, 30, 41), et comprenant en outre
    des moyens d'arrêt (51, 52), formés respectivement avec les premier et second éléments rotatifs (27, 28), pour stopper une rotation relative entre les premier et second éléments rotatifs (27, 28);
    des moyens de détection (57) pour détecter la position relative dudit premier élément rotatif (28) et dudit second élément rotatif (27) et
    des moyens (71) pour protéger lesdits moyens d'arrêt (51, 52), lesdits moyens de protection stoppant le mouvement de rotation dudit premier élément rotatif (28) avant que lesdits moyens d'arrêt (51, 52) viennent en butée l'un contre l'autre et redémarrant le mouvement de rotation dudit premier élément rotatif (28) à une faible vitesse pour permettre auxdits moyens d'arrêt (51, 52) de venir en butée l'un contre l'autre.
  2. Un dispositif selon la revendication 1, dans lequel le premier élément rotatif comprend une roue dentée menante (28) et dans lequel le second élément rotatif comprend une roue dentée menée (27) s'accouplant avec la roue dentée menante (28).
  3. Un dispositif selon la revendication 2, dans lequel ladite roue dentée menante (28) est calée dans une position de référence correspondant à un décalage de phase prédéterminé entre la roue dentée menante (28) et la roue dentée menée (27).
  4. Un dispositif selon les revendications 2 ou 3, dans lequel lesdits moyens d'arrêt comprennent un premier butoir (52) formé sur la roue dentée menante (28), et un second butoir (51), formé sur la roue dentée menée (27), ledit premier butoir (52) et ledit second butoir (51) étant disposés de façon à venir en butée l'un contre l'autre pour stopper une rotation relative entre ladite roue dentée menante (28) et ladite roue dentée menée (27).
  5. Un dispositif selon la revendication 4, dans lequel ledit premier butoir (52) et ledit second butoir (51) sont disposés de façon à venir en butée l'un contre l'autre lorsque ladite roue dentée menante (28) est amenée par rotation dans la position de référence.
EP19940109204 1993-12-02 1994-06-15 Appareille de transfert de feuilles pour une machine à imprimer Expired - Lifetime EP0658425B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP5303123A JP2898529B2 (ja) 1993-12-02 1993-12-02 枚葉印刷機の枚葉紙反転機構
JP303123/93 1993-12-02

Publications (2)

Publication Number Publication Date
EP0658425A1 EP0658425A1 (fr) 1995-06-21
EP0658425B1 true EP0658425B1 (fr) 1999-03-10

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ID=17917163

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19940109204 Expired - Lifetime EP0658425B1 (fr) 1993-12-02 1994-06-15 Appareille de transfert de feuilles pour une machine à imprimer

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EP (1) EP0658425B1 (fr)
JP (1) JP2898529B2 (fr)
DE (1) DE69416961T2 (fr)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10014417A1 (de) 2000-03-24 2001-09-27 Heidelberger Druckmasch Ag Vorrichtung zum Transport eines Bogens für eine Rotationsdruckmaschine
DE10047247A1 (de) * 2000-09-23 2002-04-11 Koenig & Bauer Ag Anordnung von Messeinrichtungen
DE10206466A1 (de) 2002-02-16 2003-09-04 Koenig & Bauer Ag Vorrichtung zur Umstellung der Greifersteuerung einer Wendetrommel
DE10358171A1 (de) * 2003-12-12 2005-07-07 Heidelberger Druckmaschinen Ag Vorrichtung zum Fördern eines Bogens durch eine drucktechnische Maschine

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1214436A (en) * 1969-07-29 1970-12-02 Planeta Veb Druckmasch Werke Improvements in or relating to rotary sheet printing machine
US3772990A (en) * 1971-05-27 1973-11-20 Miller Printing Machinery Co Sheet handling apparatus for a printing press

Also Published As

Publication number Publication date
DE69416961T2 (de) 1999-12-02
JP2898529B2 (ja) 1999-06-02
EP0658425A1 (fr) 1995-06-21
JPH07156367A (ja) 1995-06-20
DE69416961D1 (de) 1999-04-15

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