JP2018126883A - Printing machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printing machine capable of avoiding collision between parts of cylinders when a drive part different from a drive part of a machine side cylinder is broken.SOLUTION: A printing machine capable of performing two-sided printing on a paper sheet includes: a reverse related cylinder 41 having a paper sheet holding part as part of a reversal mechanism for reversing the front and back of the paper sheet, for holding the edge part of the paper sheet so as to be projected from the outer peripheral surface; a plurality of machine side cylinders different from the reverse related cylinder 41 which the printing machine includes; a first driving source for rotationally driving the plurality of machine side cylinders; a second driving source Ma provided separately from the first driving source, and rotationally driving the reverse related cylinder; and collision avoidance means 5 for avoiding collision between part of the reverse related cylinder 41, and part of the machine side cylinder adjacent to the reverse related cylinder 41 among the plurality of machine side cylinders by rotating the reverse related cylinder 41 by transmitting a driving force from the first driving source to the reverse related cylinder 41 when the second driving source Ma is broken.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a printing machine capable of performing duplex printing on a sheet.

  As a printing machine capable of performing double-sided printing on a sheet, a “sheet processing apparatus” described in Patent Document 1 has been proposed. In this apparatus, the plurality of cylinders including the printing cylinder and the suction cylinder are rotationally driven by different drive units so that the printing cylinder and the suction cylinder are synchronously rotated according to the length of the sheet to be handled.

  In the apparatus of this patent document 1, when the drive unit for driving the suction cylinder fails, the synchronization between the printing cylinder and the suction cylinder is broken. In this case, there is a possibility that a part (gripper or the like) protruding from the cylinder collides with the outer peripheral surface of another adjacent cylinder.

  Such a risk is not limited to the printing press in which the suction cylinder is driven separately as in Patent Document 1, but separately from other cylinders (hereinafter referred to as “machine-side cylinder”) by another drive unit. It exists in a printing press having a cylinder that is driven to rotate.

JP 2014-234262 A

  SUMMARY OF THE INVENTION An object of the present invention is to provide a printing machine capable of avoiding a part of the cylinders from colliding with each other when a drive unit different from the drive unit of the machine-side cylinder is broken.

  The printing machine of the present invention is a part of a reversing mechanism for reversing the front and back of a sheet in a printing machine capable of performing double-sided printing on a sheet, and grips the edge of the sheet. A reversal-related cylinder having a sheet holding portion protruding from the outer peripheral surface, a plurality of machine-side cylinders different from the reversal-related cylinder provided in the printing machine, and the plurality of machine-side cylinders respectively rotating A first drive source to be driven and a second drive source that is provided separately from the first drive source and rotationally drives the inversion-related cylinder, and is driven from the first drive source when the second drive source fails By rotating the inversion related cylinder by transmitting force to the inversion related cylinder, a main body side cylinder adjacent to the inversion related cylinder among a part of the inversion related cylinder and the plurality of main body side cylinders. A collision avoidance means for avoiding a collision with a part of There.

  In the printing press according to the present invention having the above-described configuration, a part of the reversing cylinder and the plurality of printing cylinders before the printing press is stopped after the failure of the second drive source by the collision avoidance unit. Among them, it is possible to prevent a collision with a part of the machine-side cylinder adjacent to the reversal-related cylinder. For this reason, each said cylinder will be damaged and the time and expense concerning repair can be eliminated.

  Further, the collision avoidance means may operate within a range corresponding to the length of the sheet in the conveyance direction.

  With this configuration, during the normal operation of the printing press, it corresponds to the length in the conveyance direction of the sheet between the reversing cylinder and the main cylinder that is adjacent to the reversing cylinder among the plurality of main cylinders. Even when the operation is performed, it is possible to prevent the collision appropriately by operating the collision avoiding means within a range corresponding to the length of the sheet in the conveyance direction.

  Further, the reversal-related cylinder is configured to hold a paper head of a sheet transported by a processing cylinder, which is one of the plurality of machine-side cylinders, by the sheet holding unit, so that the plurality of machine-side cylinders are used. The reversing cylinder is a reversing transfer cylinder that delivers the sheet with the paper bottom of the sheet as the head.

  With this configuration, even when the driving source is provided with a reversing transfer cylinder different from the main body side cylinder, appropriate collision prevention is possible.

  Further, during the normal operation in which the reversing transfer cylinder is rotationally driven by the second drive source, the reversing transfer cylinder is driven with a variable rotational speed in accordance with the length of the sheet in the conveyance direction, and the collision avoiding means is the second drive A driving force transmitting member that rotates to receive a driving force from the first driving source and transmit the driving force to the reversing transfer cylinder in the event of a source failure, and the reversing transfer cylinder. A displacement means for allowing a displacement within a predetermined range in the circumferential direction between the driving force transmission member and the reversing transfer cylinder and for regulating a displacement exceeding the predetermined range; it can.

  According to this configuration, the collision avoidance unit can be configured by the driving force transmission member and the shift unit, so that the configuration of the collision avoidance unit can be simplified.

  Further, the reversing transfer drum includes at least one pair of a front segment positioned forward in the rotation direction during the normal operation and a rear segment positioned rearward in the rotation direction, and the front segment and the rear segment are , One can be rotated with respect to the center axis of the reversing transfer cylinder with respect to the other, the mutual position can be changed according to the circumferential dimension corresponding to the length of the sheet in the conveyance direction, The collision avoiding means can be fixed in a state, and the collision avoiding means includes a long hole provided at each axial end of the front segment and the rear segment so as to extend in the circumferential direction, and a part of the collision avoiding means inside the long hole. Is located, rotates integrally with the driving force transmission member, the driving force transmission pin for transmitting the driving force of the first driving source to the reversing transfer cylinder, the processing cylinder, the reversing cylinder, and the reversing transfer Interlocked with each of the torso The cam portion is arranged so as to face the axial end portions of the driving force transmission member and the reversing transfer cylinder, and the one end is the driving portion and the cam portion is shaped so that the radial position of the side surface changes. A link portion having a cam follower, the other end of which is rotatably provided with respect to the force transmission pin with respect to the axial end portion of the reversing transfer cylinder, and moves while abutting along the side surface of the cam portion; Can be provided.

  With this configuration, since the collision avoidance unit can be mechanically configured, the possibility of failure of the collision avoidance unit itself can be reduced as compared with a configuration in which collision avoidance is performed by electric control. For this reason, a highly reliable printing machine can be realized.

  According to the printing press of the present invention, by providing the collision avoidance means, it is possible to avoid collision of a part of the cylinder when a drive unit other than the drive unit of the main body side cylinder fails.

1 is a schematic side view of a printing press according to an embodiment of the present invention. FIG. 6 is a side view of the cylinder showing a state where the front segment of the reverse transfer cylinder is separated from the rear segment when the sheet to be printed is the maximum sheet. FIG. 6 is a side view of the cylinder showing a state where the front segment of the reverse transfer cylinder approaches the rear segment when the sheet to be printed is the minimum sheet. It is radial direction sectional drawing which shows the structure of an inversion transfer cylinder roughly. It is an end view which shows the structure of an inversion transfer cylinder roughly. It is radial direction sectional drawing which shows a 1st avoidance means. It is explanatory drawing regarding the setting of the elongate hole of a 1st avoidance means, (A) and (B) showed the relationship between the driving force transmission pin of this machine gearwheel, and a front segment interlocking | linkage member, (C) and (D) Shows the relationship between the driving force transmission pin of the machine gear and the rear segment, (E) shows the state of (A) and (C) superimposed, (F) shows (A) and (D) (G) shows the states of (B) and (C) in an overlapping manner. (A)-(D) are the end view schematic diagrams of the arbitrary parts in the edge part of an inversion transfer cylinder which show operation | movement of a 2nd avoidance means. (E)-(H) are the end view schematic diagrams of the arbitrary parts in the edge part of the inversion transfer cylinder which show operation | movement of the 2nd avoidance means following FIG. 8 (A)-(D).

  Hereinafter, an embodiment of a printing press according to the present invention will be described with reference to the drawings. FIG. 1 schematically shows a printing press according to this embodiment. The printing machine is printed by a paper feeding unit 1 that feeds a sheet of paper toward the printing unit 2, a printing unit 2 that receives and prints a sheet from the paper feeding unit 1, and printing is performed by the printing unit 2. A paper discharge unit 3 for stocking sheets.

  The paper feeding unit 1 includes a pre-printing storage unit 11 for stocking sheets, and a feeder 12 as a paper feeding device that feeds sheets of the pre-printing storage unit 11 one by one to the printing unit 2. A sheet feeding cylinder 13 which is a transfer cylinder having a small diameter for receiving and conveying a sheet from the feeder 12, and a sheet feeding cylinder 13 which receives the sheet from the sheet feeding cylinder 13 and conveys the sheet to the printing unit 2. A paper supply side transfer cylinder 14 having a double diameter. Each of the sheet feeding cylinder 13 and the sheet feeding side transfer cylinder 14 is provided with a gripper (not shown) for holding a sheet by the nail base and the nail and a recess for receiving the gripper. In this way, the sheet is delivered.

  The paper discharge unit 3 includes a post-print storage unit (not shown) that stocks a sheet of paper that has been printed on one or both sides by the printing unit 2, and a sheet printed by the printing unit 2 as described above. A transport unit (here, a chain-type transport unit) 31 that transports the paper to the storage unit after printing.

  The printing unit 2 receives a sheet from the paper supply side transfer cylinder 14 and conveys it, and receives a sheet from the print side transfer cylinder 21 and receives an ink supply device (not shown). And a processing cylinder 22 that is supplied with ink and performs printing on one surface.

  Below the printing unit 2, a sheet printed by the processing cylinder 22 is delivered, and a plurality of sheets for inverting the sheet and delivering it to the processing cylinder 22 to print the other side of the sheet. A reversing mechanism 4 having a trunk is provided. The reversing mechanism 4 includes a reversing transfer cylinder 41 disposed below the processing cylinder 22, a reversing cylinder 42 disposed below the printing-side transfer cylinder 21, and receiving and reversing the sheet from the reversing transfer cylinder 41, It has. Note that the reversal transfer cylinder 41 corresponds to the reversal-related cylinder constituting a part of the reversing mechanism 4 for reversing the front and back of the sheet.

  Of the cylinders constituting the printing unit 2 and the reversing mechanism 4, the cylinders excluding the reversing transfer cylinder 41 are driven to rotate by a first drive source (not shown), and the reversing transfer cylinder 41 is provided separately from the first drive source. It is rotationally driven by two drive sources Ma (see FIGS. 4 and 6). In the following description, when a specific cylinder is not shown with respect to the cylinder excluding the reversing transfer cylinder 41, it will be referred to as a “machine-side cylinder”. Further, the side driven by the first drive source will be referred to as “the main unit side” for explanation.

  The printing-side transfer cylinder 21 has a diameter approximately twice that of the paper supply cylinder 13, and two grippers 21G each composed of a nail base and a nail are arranged at an interval of about 180 degrees in order to hold and hold a sheet. Are accommodated in two recesses 21R formed in the printing-side transfer cylinder 21 (see FIG. 2). Further, the processing cylinder 22 has a diameter approximately three times that of the sheet feeding cylinder 13, and three grippers 22G composed of a claw base and a claw have an interval of about 120 degrees in order to hold and hold a sheet. Each of them is accommodated in three recesses 22R formed in the processing cylinder 22 (see FIG. 2).

  The reverse transfer cylinder 41 has a diameter approximately twice that of the paper supply cylinder 13 and rotates around a fixed segment (hereinafter referred to as “front segment”) 41A and the rotation center of the reverse transfer cylinder 41 as shown in FIG. The support body which has the rotation segment (henceforth "rear segment") 41B which can move is provided in two places at intervals of 180 degree | times in the circumferential direction. The front segment 41A is positioned forward of the reverse transfer cylinder 41 in the rotational direction during normal operation in which the reverse transfer cylinder 41 is rotationally driven by the second drive source Ma, and the rear segment 41B is positioned during normal operation of the reverse transfer cylinder 41. Located behind the rotation direction. The reverse transfer cylinder 41 only needs to include at least one pair of the front segment 41A and the rear segment 41B. In the present embodiment, the reverse transfer cylinder 41 includes two pairs.

  The outer peripheral surfaces of the front segments 41A and the rear segments 41B are formed in an arc shape and are arranged on the same curved surface. And each front segment 41A and each rear segment 41B are comprised in the comb-tooth shape which can mutually mesh | engage, and each rear segment 41B rotates with respect to each front segment 41A, and it approaches rear segment 41B. Thus, it is possible to switch between a state in which the two are deeply engaged and a state in which the engagement is substantially eliminated by separating from the rear segment 41B. Therefore, by rotating the front segment 41A by the maximum angle toward the side away from the rear segment 41B at the rotation center of the reversing transfer cylinder 41, the engagement between the two segments is substantially eliminated, so that the circumferential length of the outer peripheral surface of the rear segment 41B is obtained. The circumferential length including the circumferential length of the outer peripheral surface of the front segment 41A is set to be approximately equal to the longest length corresponding to the longest paper in the conveyance direction among the sheets handled by the printing press. (See FIG. 2). Further, by rotating the front segment 41A so as to be deeply engaged with the rear segment 41B, the circumferential length obtained by adding the rear outer peripheral surface of the rear segment 41B to the outer peripheral surface of the front segment 41A is a sheet handled by the printing press. The length in the transport direction of the leaf paper is set to be approximately equal to the shortest length corresponding to the shortest paper (see FIG. 3). Further, in the combination of the pair of front and rear segments 41A and 41B of the two pairs, a gripper 41G composed of a claw base and a claw as a sheet holding portion is provided at the front end in the rotational direction of one front segment 41A, and processed. The paper head, which is the leading edge (downstream side edge) of the sheet from the cylinder 22, can be held and held. Further, the rear end (upstream side end) of the sheet of paper whose head is held by the gripper 41G of the one front segment 41A at the rear end in the rotational direction of one rear segment 41B that makes a pair with one front segment 41A. ) Is provided.

  Next, with reference to FIGS. 4 and 5, the configuration of the reversing transfer cylinder 41 will be described in more detail. For convenience of explanation, FIGS. 4 and 5 show only one pair of the front segment 41A and the rear segment 41B. In addition, the illustrated contents are simplified for explanation of the configuration, or the positional relationship is changed, so that there is a portion that does not match the other drawings.

  In the reverse transfer cylinder 41, the outer peripheral surface portion 411A of the front segment 41A and the outer peripheral surface portion 411B of the rear segment 41B are arranged on the same curved surface. These outer peripheral surface portions 411A and 411B are formed in an arc shape.

  A plurality of claw pieces 412 that are spaced apart in the axial direction and extend in the circumferential direction are formed on the outer peripheral surface portion 411A of the front segment 41A. The outer peripheral surface portion 411B of the rear segment 41B includes a plurality of guide grooves 413 that are loosely fitted in the claw pieces 412 in the circumferential direction and extend in the circumferential direction. The reverse transfer cylinder 41 includes a whole shaft 414 and a rotation shaft 415 concentrically. The entire shaft 414 is a rotation center and a shaft when the front segment 41A and the rear segment 41B are integrally rotated around the axis. The rotation shaft 415 is an axis that serves as a rotation center when the front segment 41A is rotated relative to the rear segment 41B. The entire shaft 414 is supported by the frame F, and the rotation shaft 415 is externally fitted so as to be loosely fitted to the entire shaft 414.

  The front segment 41A has the same axis as the rear segment 41B, and is rotationally driven around the axis by the second drive source Ma. On the other hand, the rear segment 41B can be rotated with respect to the front segment 41A by being rotationally driven around the axis by the rear segment rotation drive source Mb. A rear segment gear 4151 as a driven gear is attached to the rotation shaft 415, and a drive gear 4152 connected to the output shaft of the rear segment rotation drive source Mb is engaged with the rear segment gear 4151. A front segment gear 4141 as a driven gear driven by the second drive source Ma is attached to the shaft end of the overall shaft 414, and is connected to the output shaft of the second drive source Ma to the front segment gear 4141. The drive gear 4142 is meshed.

  The length in the circumferential direction of the outer peripheral surface portion 411B of the rear segment 41B is the length in the transport direction of the sheet (the portion indicated by the reference numeral “P” indicated by a two-dot chain line in FIG. 5) handled by the printing machine in this embodiment. Is set to be approximately equal to the shortest distance corresponding to the shortest (minimum paper). The circumferential length obtained by adding the circumferential length of the outer peripheral surface portion 411B of the rear segment 41B to the circumferential length of the outer peripheral surface portion 411A of the front segment 41A in a state where the rear segment 41B is rotated by the maximum angle with respect to the front segment 41A. Is set to be approximately equal to the longest distance corresponding to the longest sheet in the transport direction (maximum paper) among the sheets handled by the printing press in the present embodiment.

  The front segment 41A is provided with a front end holding means for holding the paper head, which is the front end (downstream end) of the sheet conveyed from the upstream side, on the front end side in the rotational direction of the outer peripheral surface portion 411A. The rear segment 41B is provided with a rear end side holding means for holding the paper bottom, which is the rear end (upstream end) of the sheet, on the rear end side in the rotational direction of the outer peripheral surface portion 411B.

  The leading end side holding means is a gripper 41G that holds and holds the sheet head (the “P1” portion shown in FIG. 5). The gripper 41G is rotatable about the body of the front segment 41A via a support shaft 416, and holds the paper head by rotating around the support shaft 416. The rear end side holding means is a sucker 41S that sucks the bottom of the sheet (the “P2” portion shown in FIG. 5) to the outer peripheral surface portion 411B of the rear segment 41B. In this case, the holding force by the sucker 41S is set smaller than the holding force of the sheet by the gripper 41G.

  As described above, one of the front segment 41A and the rear segment 41B is rotatable with respect to the center axis of the reverse transfer cylinder 41 with respect to the other, and the circumferential dimension corresponding to the length in the sheet conveyance direction. It is possible to change the mutual position according to the situation and to be fixed in that state.

  The reversing cylinder 42 is composed of a small cylinder having substantially the same diameter as the sheet feeding cylinder 13, and accommodates a gripper 42G made up of a pair of claws in a recess 42R formed at one place in the circumferential direction. The reversing cylinder 42 rotates twice while the reversing transfer cylinder 41 rotates once.

  Here, the sheet feeding cylinder 13, the sheet feeding side transfer cylinder 14, the printing side transfer cylinder 21, the processing cylinder 22, and the reversing cylinder 42 are mechanically linked and connected by a gear (not shown), and one first drive source ( (Not shown) is configured to be driven to rotate and operate synchronously. On the other hand, the reverse transfer cylinder 41 is rotationally driven by a second drive source (for example, a servo motor) Ma different from the first drive source. For this reason, the reverse transfer cylinder 41 is driven separately from a plurality of main body side cylinders (for example, the processing cylinder 22 and the reverse cylinder 42 adjacent to the reverse transfer cylinder 41).

  The second drive source Ma changes the rotation phase of the reverse transfer cylinder 41 by accelerating / decelerating the reverse transfer cylinder 41 according to the length of the sheet in the conveyance direction by a control unit (not shown) provided in the printing press. Can be driven. Specifically, in the printing machine of the present embodiment, the second drive source Ma is driven so that the reverse transfer cylinder 41 rotates at the same rotation phase with respect to a plurality of machine-side cylinders with a sheet having the maximum printable size. To do. On the other hand, when the length of the sheet in the conveyance direction is smaller than the maximum dimension, the reverse transfer cylinder 41 is decelerated and rotated by the dimensional difference, so that the paper bottom is formed with respect to the gripper 42G of the reverse cylinder 42. The second drive source Ma is driven so as to match. In this way, the reversing transfer drum 41 is driven at a variable rotation speed according to the length of the sheet in the conveyance direction during normal operation.

  As described above, the gripper 41G protrudes from the reverse transfer cylinder 41. Further, a gripper 22G protrudes from the processing cylinder 22. Further, a gripper 42G protrudes from the reversing body 42. However, during normal operation, a recess for preventing interference is formed in a portion of each cylinder that faces each gripper of the adjacent cylinder, so that adjacent cylinders do not collide with each other.

  However, when the second drive source Ma fails, for example, when the second drive source Ma stops or can only be driven at a low speed, the rotation of the reversing transfer cylinder 41 stops or is slower than during normal operation. It may turn. The “failure” is not limited to the failure of the second drive source Ma itself but also includes a case where an abnormality occurs in the power supply to the second drive source Ma or the control of the second drive source Ma by the control unit. When such a failure occurs, the reversing transfer cylinder 41 is out of phase with the adjacent machine side cylinder (processing cylinder 22, reversing cylinder 42). More specifically, the reversing transfer cylinder 41 rotates relative to the adjacent machine-side cylinder (processing cylinder 22, reversing cylinder 42) beyond a predetermined phase shift according to the length in the sheet conveyance direction. Will not fit. Then, a part of the reversing transfer cylinder 41 and a part of the processing cylinder 22 or the reversing cylinder 42 adjacent to the reversing transfer cylinder 41 may collide.

Specifically, this collision can be considered as follows.
(1-1) Collision between the gripper 41G of the reverse transfer cylinder 41 and the outer peripheral surface of the processing cylinder 22.
(1-2) Collision between the gripper 22G of the processing cylinder 22 and the outer peripheral surface of the reverse transfer cylinder 41.
(2-1) Collision between the gripper 42G of the reverse cylinder 42 and the rear segment 41B of the reverse transfer cylinder 41.
(2-2) Collision between the front segment 41A of the reverse transfer cylinder 41 and the gripper 42G of the reverse cylinder 42.

  In order to avoid these collisions, the printing press according to the present embodiment transmits a driving force from the first drive source to the reverse transfer cylinder 41 when the second drive source Ma fails. Even when the driving force of the second driving source Ma is no longer applied or when the driving force is only insufficiently applied, a part of the inversion transfer cylinder 41 and the processing cylinder 22 are rotated by rotating the inversion transfer cylinder 41. And collision avoiding means 5 for avoiding a collision with a part of the reversing cylinder 42.

  Hereinafter, the configuration of the collision avoidance means 5 in the present embodiment will be described. This collision avoidance means 5 is provided across the machine side and the reverse transfer drum 41 side. The collision avoiding means 5 includes a first avoiding means 51 configured by elongated holes 511A and 511B and driving force transmission pins 512A and 512B, and a second avoiding means 52 configured by a cam portion 521 and a link portion 522. Is provided.

  First, the 1st avoidance means 51 is demonstrated. The first avoiding means 51 includes elongated holes 511A and 511B provided at the axial ends of the front segment 41A and the rear segment 41B so as to extend in the circumferential direction, and a part of the elongated holes 511A and 511B. Is positioned and rotates integrally with the machine gear 6 (see FIG. 6), and the driving force of the first driving source is transmitted to the reverse transfer cylinder 41 (front segment 41A and rear segment 41B). 512A and 512B. In this embodiment, as shown in FIG. 6, the driving force transmission pin 512A corresponding to the front segment interlocking member 4143 uses a shaft portion of a bolt screwed into the machine gear 6 and the rear segment gear 4151. For the driving force transmission pin 512B corresponding to, a head portion of a bolt screwed into the machine gear 6 is used. However, the form of the driving force transmission pins 512A and 512B is not limited to this, and can be various forms.

  Three gears are provided at one end of the reverse transfer drum 41 (the end opposite to the paper surface side in FIG. 1). As shown in FIG. 6, these gears are arranged in the order of the main machine gear 6, the rear segment gear 4151, and the front segment gear 4141 from the inner side which is the reverse transfer cylinder 41 side to the outer side which is the outer side of the printing press. Yes. The machine gear 6 functions as a driving force transmission member for receiving the driving force from the first driving source and transmitting the driving force to the reversing transfer cylinder 41 when the second driving source Ma fails. The front segment gear 4141 rotates as a part of the front segment 41A, and the rear segment gear 4151 rotates as a part of the rear segment 41B.

  As described above, the driving force of the first driving source is transmitted to the machine gear 6. On the other hand, the driving force of the second driving source Ma is transmitted to the front segment gear 4141. The rotational positional relationship between the machine gear 6 and the front segment gear 4141 is set to a predetermined relationship by the control unit provided in the printing press at the start of normal operation.

  Further, a front segment interlocking member 4143 is provided inside the front segment gear 4141 as a part of the front segment 41A. During normal operation, the driving force is transmitted from the second drive source Ma via the drive gear 4142 and the front segment gear 4141.

  An elongated hole 511A provided in the axial direction end surface of the front segment interlocking member 4143 as a part of the first avoiding means 51 so as to extend in the circumferential direction is formed (see FIGS. 7A and 7B). . In the present embodiment, three elongated holes 511 </ b> A are formed in rotational symmetry with respect to the rotation center axis of the front segment interlocking member 4143. However, the number of the elongated holes 511A formed is not limited to three. Moreover, the some long hole 511A may be formed in the position of a different diameter. The circumferential length of the long hole 511A is not delayed with respect to the phase of the reversing transfer cylinder 41 (particularly the front segment 41A) with respect to the main body side cylinder as shown in FIG. From the position of the driving force transmission pin 512A corresponding to the front segment interlocking member 4143 of the machine gear 6 in the case of the maximum length), as shown in FIG. This corresponds to the position of the driving force transmission pin 512A in the case where the length in the sheet conveyance direction is minimum).

  An elongated hole 511 </ b> B provided so as to extend in the circumferential direction is also formed as a part of the first avoiding means 51 on the axial end surface of the rear segment gear 4151. In the present embodiment, two elongated holes 511B are formed so as to face the rotation center axis of the rear segment gear 4151. However, the number of the long holes 511B formed is not limited to two. Moreover, the some long hole 511B may be formed in the position of a different diameter. As shown in FIG. 7C, the circumferential length of the elongated hole 511B is not advanced with respect to the phase of the rear segment 41B with respect to the main body side cylinder (when the length of the sheet in the conveyance direction is maximum). 7D, from the position of the driving force transmission pin 512B corresponding to the rear segment gear 4151 of the machine gear 6 in the corresponding state, as shown in FIG. Is a length corresponding to the position of the driving force transmission pin 512B.

  Here, the setting of the circumferential dimension of the long holes 511A and 511B will be described with reference to FIG. 7A to 7G are diagrams when the outside is viewed from the inside, but for the convenience of explanation, a portion hidden behind the back side is also indicated by a solid line (particularly the diagram). 7 (E)-(G)).

  FIG. 7A shows the relationship between the driving force transmission pin 512A of the machine gear 6 and the front segment interlocking member 4143 corresponding to the maximum size sheet (maximum paper) that can be printed by the reverse transfer cylinder 41. In other words, the phase of the reverse transfer cylinder 41 is not delayed with respect to the phase of the main body side cylinder. FIG. 7B shows the relationship between the driving force transmission pin 512A of the machine gear 6 and the front segment interlocking member 4143, which corresponds to the smallest sized sheet (minimum paper) that the reverse transfer cylinder 41 can print. In other words, the phase of the front segment interlocking member 4143 is most delayed with respect to the phase of the main body side barrel.

  FIG. 7C shows the relationship between the driving force transmission pin 512B of the machine gear and the rear segment gear 4151, and when the reverse transfer cylinder 41 is set corresponding to the largest sheet, that is, the rear segment gear. 4151 shows a state in which the phase of 4151 does not advance with respect to the phase of the main body side barrel. FIG. 7D shows the relationship between the driving force transmission pin 512B of the machine gear and the rear segment gear 4151, and when the reverse transfer cylinder 41 is set corresponding to the smallest sheet, that is, the rear segment gear. 4151 shows a state in which the phase of 4151 is the most advanced with respect to the phase of the main body side barrel.

  FIG. 7E shows the state of FIG. 7A and FIG. When the sheet is the largest sheet, the front segment 41A is not delayed and the rear segment 41B is not advanced with respect to the phase of the main body side cylinder. FIG. 7F illustrates the states of FIGS. 7A and 7D in an overlapping manner. When the sheet is the minimum paper, the front segment 41A has the maximum delay and the rear segment 41B has the maximum advance.

  Incidentally, FIG. 7 (G) shows the state of FIGS. 7 (B) and 7 (C) in an overlapping manner. The relationship between the front segment 41A and the rear segment 41B with respect to the machine gear 6 is shown in FIG. There is a possibility of changing from the state of F) to this state.

  In this way, if the circumferential dimensions of the long holes 511A and 511B are set so that the respective states shown in FIGS. 7E to 7G can be obtained, it is possible to handle from the largest sheet to the smallest sheet. The first avoiding means 51 can be realized.

  In this embodiment, as shown in FIGS. 7E to 7G, the elongated hole 511B of the rear segment gear 4151 is formed at a larger diameter position than the elongated hole 511A of the front segment interlocking member 4143, and is larger. Although it is formed so as to have a radius of curvature, it is not particularly limited, and it may be formed at the same diameter position or a small diameter position.

  As shown in FIG. 6, the machine gear 6 is positioned between the front segment interlocking member 4143 belonging to the front segment 41A and the rear segment gear 4151 belonging to the rear segment 41B. Driving force transmission pins 512 </ b> A and 512 </ b> B protrude from the inner and outer end surfaces of the machine gear 6 as a part of the first avoiding means 51. Three driving force transmission pins 512A protrude from the inner end face of the machine gear 6, and a part of these driving force transmission pins 512A is located in an elongated hole 511A formed in the front segment interlocking member 4143. On the other hand, two driving force transmission pins 512B protrude from the outer end face of the machine gear 6, and a part of these driving force transmission pins 512B is located in an elongated hole 511B formed in the rear segment gear 4151. .

  For this reason, both of the driving force transmission pin 512A located in the elongated hole 511A formed in the front segment interlocking member 4143 and the driving force transmission pin 512B positioned in the elongated hole 511B formed in the rear segment interlocking member are both elongated hole ends. If it is not in the section (the tip in the rotation direction of the machine gear 6), the machine gear 6 is in a free state, so that only the machine gear 6 can rotate.

  On the other hand, either the driving force transmission pin 512A located in the elongated hole 511A formed in the front segment interlocking member 4143 or the driving force transmission pin 512B positioned in the elongated hole 511B formed in the rear segment interlocking member is an elongated hole. When it is at the end (the front end in the rotational direction of the machine gear 6), the driving force transmission pins 512A and 512B abut against the end of the elongated hole. 41 rotates together with the machine gear 6.

  Therefore, the circumferential position shift (that is, the phase shift) between the machine gear 6 and the front segment 41A and the machine gear 6 and the rear segment 41B is regulated within the formation range of the long holes 511A and 511B. Exceeding the range is prevented. Therefore, it is possible to prevent the occurrence of a large shift exceeding the regulation that causes a collision between parts of the cylinder.

  As described above, the circumferential lengths of the long holes 511A and 511B correspond to the length of the sheet in the conveyance direction. Therefore, the collision avoiding means 5 of the present embodiment is the length in the sheet conveyance direction (specifically, from the maximum length to the minimum length of the sheet that can be printed by the printing machine of the present embodiment). It operates in the circumferential range corresponding to.

  As described above, the collision avoidance unit 5 of the present embodiment, as the first avoidance unit 51, receives the driving force from the first driving source and transmits the driving force to the reverse transfer cylinder 41 when the second driving source Ma fails. This is a shift means provided between the machine gear 6 and the reversing transfer cylinder 41 for allowing a predetermined range of deviation in the circumferential direction between the machine gear 6 and the reversing transfer cylinder 41. In addition, a combination of elongated holes 511A and 511B and driving force transmission pins 512A and 512B as displacement means for restricting displacement exceeding the predetermined range is provided.

  Next, the second avoiding means 52 will be described. The cam portion 521 that is a part of the second avoiding means 52 is supported by the frame of the printing machine, and does not move in synchronization with the processing cylinder 22, the reversing cylinder 42, and the reversing transfer cylinder 41. It is arranged to face the gear 6 and the front segment interlocking member 4143 (that is, in parallel with the axial direction of the reversing transfer cylinder 41), and is a portion shown by hatching in FIGS. Thus, the shape of the side surface changes in the radial direction.

  In addition, the link portion 522 which is a part of the second avoiding means 52 has one end of the three driving force transmission pins 512A corresponding to the front segment interlocking member 4143 and the other end of the front segment interlocking member. A cam follower 5223 is provided in the middle so as to be rotatable with respect to 4143 and moves along the side surface of the cam portion 521.

  As shown in FIGS. 7A and 7B, the link portion 522 includes one end side member 5221 and the other end side member 5222 as shown in FIGS. 7A and 7B. Are connected to each other so that the portions extending linearly in each of the members 5221 and 5222 are bent at two locations. However, each member 5221 and 5222 is not limited to this shape, For example, it can also form in the curve shape which curves with a fixed curvature.

  The cam follower 5223 is a cylindrical body, and is provided on the one end side member 5221 so as to protrude inward along the axial direction of the reversal transfer drum 41 (see FIG. 6). As the machine gear 6 rotates, the cam follower 5223 moves along the cam portion 521 while the outer peripheral surface is in contact with the side surface of the cam portion 521 (see FIGS. 8 and 9).

  As shown in FIGS. 8 and 9, the cam portion 521 is formed so that the radial dimension becomes larger at the center in the circumferential direction. With this shape, the cam follower 5223 moves in the radial direction. With this radial movement, the link portion 522 has a circumferential distance between one end and the other end that extends and shortens.

  Accordingly, the link unit 522 corrects the reverse transfer cylinder 41 to a desired rotational position by performing an advance / retreat operation that partially advances or delays the phase of the reverse transfer cylinder 41 in the circumferential direction via the front segment interlocking member 4143. can do.

  By the second avoiding means 52, the advance / retreat operation is performed only at a specific location in the circumferential direction of the reversing transfer cylinder 41. In the present embodiment, the specific location is set to a location where the “1-2” collision (collision between the gripper 22G of the processing cylinder 22 and the outer peripheral surface of the reverse transfer cylinder 41) may occur. .

  During normal operation, the reversing transfer cylinder 41 is rotated with respect to the processing cylinder 22 and the reversing cylinder 42 with high accuracy. Therefore, although the cam portion 521 and the link portion 522 are operated, the advance / retreat operation is performed. It will never be done. This is because the advance / retreat operation is configured to operate to correct an excessive phase difference exceeding the range corresponding to the length in the sheet conveyance direction.

  FIGS. 8A to 8D and FIGS. 9E to 9H show changes in the positional relationship of the second avoiding means 52 in the forward rotation direction (rotation direction during normal operation) on the machine side. This is shown every 15 ° on the basis of the rotation angle. 8A, the angle of the reverse transfer cylinder 41 with respect to the processing cylinder 22 is 0 °, FIG. 8B is 15 °, FIG. 8C is 30 °, FIG. 8D is 45 °, and FIG. E) shows 60 °, FIG. 8F shows 75 °, FIG. 8G shows 90 °, and FIG. 8H shows 105 °.

  The angle shown in each figure shows the rotation angle of the reverse transfer cylinder 41 (the front segment interlocking member 4143) with the angle of the gripper 41G in FIG. As shown in each figure, it can be seen that the rotation angle of the reversing transfer cylinder 41 does not change in increments of 15 °. This is because the reversing transfer cylinder 41 is advanced and retracted by the link portion 522 as described above.

  As described above, the printing press according to the present embodiment includes the collision avoiding unit 5 (the first avoiding unit 51 and the second avoiding unit 52) having the above-described configuration, so that the phase of the reverse transfer cylinder 41 advances from the phase of the main unit side cylinder. This is regulated by the first avoiding means 51. Further, the second avoiding means 52 restricts the phase of the reverse transfer cylinder 41 from being delayed by the second avoiding means 52 to the extent that the gripper interferes. Thereby, the collision of “1-1” (collision between the gripper 41G of the reverse transfer cylinder 41 and the outer peripheral surface of the processing cylinder 22) and the collision of “1-2” (inversion with the gripper 22G of the processing cylinder 22). Collision with the outer peripheral surface of the transfer drum 41 is avoided.

  In the “2-1” collision (the collision between the gripper 42G of the reversing cylinder 42 and the rear segment 41B of the reversing transfer cylinder 41), the phase of the paper bottom portion of the reversing transfer cylinder 41 (that is, the rear segment 41B) is the main phase. Such a situation is regulated by the first avoiding means 51, although it is caused by being delayed from the phase of the machine-side trunk. Further, in the collision of “2-2” (the collision between the front segment 41A of the reverse transfer cylinder 41 and the gripper 42G of the reverse transfer cylinder 42), the phase of the paper head portion of the reverse transfer cylinder 41 (that is, the front segment 41A) is the main phase. Such a situation is also regulated by the first avoiding means 51, although it is caused by proceeding from the phase of the machine-side trunk.

  As described above, the first avoiding means 51 configured by the long holes 511A and 511B and the driving force transmission pins 512A and 512B and the second avoiding means 52 configured by the cam portion 521 and the link portion 522 cooperate. Thus, the collisions listed in “1-1” to “2-2” are effectively avoided.

  The collision avoiding means 5 transmits the driving force of the first drive source to rotate the reverse transfer cylinder 41. The rotation of the reverse transfer cylinder 41 by the first drive source is exclusively for collision avoidance. Therefore, it cannot be rotated with high accuracy so that normal printing can be continued. Therefore, the operation of the collision avoiding means 5 (referring to an operation that fulfills the collision avoidance function) is performed by at least the main body side cylinder (particularly the processing cylinder 22 and the processing cylinder 22) by the control unit of the printing press after the second drive source Ma fails. This is done for a limited period until the reversing transfer cylinder 41) and the reversing transfer cylinder 41 are stopped. In other words, the collision avoidance means 5 is rotationally driven by the first drive source so that the rotation drive of the reversal transfer cylinder 41 by the second drive source Ma is traced to the extent that the accuracy is low but collision can be avoided.

  Further, during normal operation, both the driving force transmission pin 512A located in the elongated hole 511A formed in the front segment interlocking member 4143 and the driving force transmission pin 512B located in the elongated hole 511B formed in the rear segment gear 4151. Is not at the end of the long hole (the tip in the rotational direction of the gear 6). For this reason, since this machine gear 6 is in a free state with respect to the front segment interlocking member 4143 and the rear segment gear 4151, the collision avoidance means 5 does not operate. The collision avoiding means 5 is formed in the front segment interlocking member 4143 by virtue of the driving force of the first driving source being won by the disappearance or reduction of the driving force of the second driving source Ma when the second driving source Ma fails. One of the driving force transmission pin 512A located in the elongated hole 511A and the driving force transmission pin 512B located in the elongated hole 511B formed in the rear segment gear 4151 is the end of the elongated hole (the rotation of the machine gear 6). Operates by being located at the tip in the direction). Thus, the collision avoidance means 5 of this embodiment is in an “operation standby state” in normal operation.

  By adopting the configuration of the present embodiment, it is possible to configure a collision avoidance means that operates on the condition that a failure of the second drive source Ma is detected, or to transmit the driving force of the first drive source to the reverse transfer cylinder 41. Since there is no need to provide means (such as a clutch) for connecting and disconnecting the printer, there is an advantage that the configuration of the printing press can be simplified.

  Moreover, since the collision avoidance means 5 can be mechanically configured in the present embodiment, the cause of the failure of the collision avoidance means 5 itself is limited to wear or damage of the constituent members as compared with a configuration in which collision avoidance is achieved by electrical control. Therefore, it is possible to reduce the possibility of failure and to realize a highly reliable printing press.

  The printing press according to the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the gist of the present invention.

  The concept of a sheet in the present invention includes a sheet-like body made of a material other than narrowly defined paper such as a resin sheet.

  Moreover, the structure of a some trunk | drum is not limited to the structure of the said embodiment, A various change is possible. Further, the reversal-related cylinder defined in the claims is the reversal transfer cylinder 41 in the above-described embodiment. However, the reversal-related cylinder is particularly limited as long as the phase can be changed according to the length of the sheet in the conveyance direction. For example, another cylinder included in the reversing mechanism 4 such as the reversing cylinder 42 may be used.

  In the reverse transfer cylinder 41 of the above embodiment, the fixed segment is the front segment 41A and the rotating segment is the rear segment 41B. Conversely, the rotating segment is the front segment 41A and the fixed segment is the rear segment. The segment 41B may be used.

  Further, as the first avoiding means 51, the combination of the elongated holes 511A and 511B and the driving force transmission pins 512A and 512B has been described in the above embodiment, but this is only an example, and the driving force transmission member (the above embodiment) is described. Then, the specific form can be variously changed as long as it corresponds to a shift means that allows a predetermined range of shift in the circumferential direction between the machine gear 6) and the reverse transfer cylinder 41. For example, a combination of a rail installed in the circumferential direction at the axial end portion of the reversing transfer drum and a moving unit capable of moving in a predetermined range in the circumferential direction along the rail may be used.

  In the embodiment, the long holes 511A and 511B are formed at the axial ends of the front segment interlocking member 4143 and the rear segment gear 4151, respectively. However, the present invention is not limited to this. For example, by using a member other than a gear, an elongated hole can be formed on the outer peripheral surface of the member. Thus, the 1st avoidance means 51 should just be a moving means which moves the circumferential direction path | route provided along the circumferential direction, and the predetermined range of the circumferential direction along the said circumferential path, for example, and a form is not limited. .

  Further, in order to mitigate the impact when the driving force transmission pins 512A and 512B hit the ends of the long holes 511A and 511B, either the machine gear 6 side, the front segment 41A or the rear segment 41B side, or Both can also be provided with shock absorbers. For example, shock absorbing portions can be provided on the inner surfaces of the end portions of the long holes 511A and 511B and the outer peripheral portions of the driving force transmission pins 512A and 512B.

  Further, as the second avoiding means, the combination of the cam portion 521 and the link portion 522 has been described in the above embodiment, but this is only an example, and the driving force transmission member (the machine gear 6 in the above embodiment) and As long as it corresponds to means for performing local alignment in the circumferential direction with the reverse transfer cylinder 41, the specific form can be variously changed. For example, a groove or a slot that is curved so as to correspond to the side surface shape of the cam is formed in a member that is immovable, and a moving unit that moves along the groove or slot on the reverse transfer cylinder 41 side. By providing the function, the same function as in the above embodiment can be realized.

  In the above embodiment, the driving force transmission pins 512A and 512B are provided on the machine side, and the long holes 511A and 511B are provided on the reverse transfer cylinder side. Conversely, the long holes are provided on the machine side. In addition, a driving force transmission pin may be provided on the reverse transfer cylinder side.

  In the above-described embodiment, the cam follower 5223 is configured to move in the radial direction. However, a member corresponding to the cam follower 5223 may be configured to move in the axial direction of the reverse transfer cylinder 41.

  Further, in the above embodiment, the collision avoidance means 5 is entirely mechanically configured, but it is also possible to electrically configure a part of the collision avoidance means 5 and perform collision avoidance by electrical control. Also, a hydraulic mechanism can be used as a part of the collision avoidance means 5.

DESCRIPTION OF SYMBOLS 1 ... Paper feed part, 2 ... Printing part, 3 ... Paper discharge part, 4 ... Reversing mechanism, 5 ... Collision avoiding means, 6 ... Driving force transmission member (this machine gear), 22 ... This machine side cylinder (processing cylinder) , 41 ... Reverse related cylinder (inverted transfer cylinder), 41A ... Front segment, 41B ... Rear segment, 41G ... Sheet paper holding part (gripper), 42 ... Machine side cylinder (reverse cylinder), 51 ... Displacement means (first 1 avoiding means), 52 ... second avoiding means, 511A ... long hole, 511B ... long hole, 512A ... driving force transmitting pin, 512B ... driving force transmitting pin, 521 ... cam portion, 522 ... link portion, 5223 ... cam follower, Ma ... Second drive source (servo motor)

Claims (5)

In a printing machine that can perform double-sided printing on a sheet of paper,
A reversing-related cylinder which is a part of a reversing mechanism for reversing the front and back of the sheet, and has a sheet holding portion that grips an end of the sheet so as to protrude from the outer peripheral surface;
A plurality of main body side cylinders different from the inversion related cylinders provided in the printing press;
A first drive source for rotating each of the plurality of machine-side cylinders;
A second drive source that is provided separately from the first drive source and that rotationally drives the inversion related cylinder;
When the second drive source fails, by rotating the inversion related cylinder by transmitting driving force from the first drive source to the inversion related cylinder, a part of the inversion related cylinder and the plurality of books A printing press comprising: a collision avoiding means for avoiding a collision with a part of the main body side cylinder adjacent to the reversal-related cylinder among the main body cylinders.   The printing press according to claim 1, wherein the collision avoidance unit operates in a range corresponding to a length in a conveyance direction of the sheet.   The reversal-related cylinder is configured such that a sheet head of a sheet conveyed by a processing cylinder which is one of the plurality of machine-side cylinders is held by the sheet holding unit, and one of the plurality of machine-side cylinders is provided. The printing press according to claim 1 or 2, wherein the reversing cylinder is a reversing transfer cylinder that delivers the sheet to the reversing cylinder starting from the bottom of the sheet. The reverse transfer cylinder is driven at a rotational speed variable according to the length of the sheet in the conveyance direction during normal operation rotated by the second drive source.
The collision avoiding means is configured to receive a driving force from the first driving source and rotate to transmit the driving force to the reversing transfer cylinder when the second driving source fails; and Deviation means provided across the reversing transfer cylinder, which allows a predetermined range of deviation in the circumferential direction between the driving force transmission member and the reversing transfer cylinder and exceeds the predetermined range. The printing press according to claim 3, further comprising a deviation unit that regulates the deviation. The reversing transfer drum includes at least one pair of a front segment positioned in front of the rotation direction during the normal operation and a rear segment positioned rearward in the rotation direction,
One of the front segment and the rear segment is rotatable with respect to the center axis of the reversing transfer cylinder with respect to the other, and is adjusted to a circumferential dimension corresponding to the length in the sheet conveyance direction Can change the position of each other and can be fixed in that state,
The collision avoidance means includes
An elongated hole provided in each axial end of the front segment and the rear segment so as to extend in the circumferential direction;
A driving force transmission pin that is partially located inside the elongated hole, rotates integrally with the driving force transmission member, and transmits the driving force of the first driving source to the reversing transfer cylinder;
The processing cylinder, the reversing cylinder, and the reversing transfer cylinder are not interlocked with each other, and are disposed so as to face the axial ends of the driving force transmission member and the reversing transfer cylinder. A cam portion whose shape changes in the radial direction;
A cam follower which is provided so that one end thereof is rotatable with respect to the driving force transmission pin and the other end is rotatable with respect to the axial end portion of the reversing transfer cylinder, and moves while abutting along the side surface of the cam portion. The printing machine according to claim 4, further comprising: a link unit having the same.