JPH0718683Y2 - Folding machine for rotary printing press - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a folder attached to a rotary printing press.

<Prior Art> A web-fed rotary printing machine is equipped with a folding machine that cuts a dried and cooled web after printing and folds it in a width direction or a length direction. . The folding method for this folding machine is a former folding in which the web before cutting is half-folded in the width direction by a former, and a parallel folding in which the signature after cutting is folded in half or four in the length direction with an origami cylinder. There are two-fold folding or parallel folding, and chopper folding in which a folded signature is folded in half in the orthogonal direction with a chopper. These folding methods are selected according to the signature specifications and used independently. , Some of them are combined.

The folding machine of such a rotary printing machine is equipped with a cutting cylinder, a folding cylinder, a first gripping cylinder, a second gripping cylinder, a reduction cylinder as a receiving cylinder, and upper and lower transfer cylinders, each cylinder being in contact with the other. It can be driven to rotate synchronously. In this folding machine, the web cut by the cutting cylinder is guided to the first gripping cylinder through the folding cylinder, folded once in parallel, and then discharged through the receiving cylinder and the transfer cylinder. It has a first transport path and a second transport path in which a signature folded in parallel 1 is folded in parallel 2 by a second gripper and then discharged.

Then, conventionally, the feed rollers are arranged on the first conveyance path and
Pressing brushes are arranged on the transport path. That is, by feeding the signature released from the first gripper cylinder to the upper side of the first gripper cylinder while holding it between the peripheral surface of the first gripper cylinder and transporting the signature to the speed reducer cylinder. Rollers are installed. Also, on the lower side of the first grip barrel, the first
A holding brush for pressing the paper tail side of the signature held by the holding cylinder against the peripheral surface of the first holding cylinder is attached.

Therefore, when performing the parallel one-fold, the signature is correctly conveyed to the receiving cylinder by being assisted by the feed rollers on the first conveying path. Further, in the case of performing the parallel two-fold, the paper edge side of the signature is pressed by the pressing brush on the second transport path, and the signature is transported to the second gripper cylinder without folding or wrinkling.

<Problems to be Solved by the Invention> In such a conventional rotary printing press folder, the feed roller and the presser brush are constantly pressed against the outer peripheral surface of the first gripper cylinder, so that they are not used for a long time. The pressure contact part will be worn when using it. This feed roller and presser brush are first
The signature is properly supported by the pressure force applied to the gripper cylinder, and if it is worn, the signature cannot be supported properly and fold failure occurs. Therefore, conventionally, a worn member is replaced every predetermined period.

However, although the feed roller and the presser brush are consumable items as described above, they can be easily replaced, but the replacement work takes a long time and the folding machine must be stopped each time. However, there is a problem in that the work efficiency of the entire printing machine is deteriorated by this.

Further, since the feed roller and the presser brush are replaced every predetermined period, the running cost becomes high.

The present invention solves such a problem, and it is an object of the present invention to provide a folder for a rotary printing press, which extends the life of press contact members such as a feed roller and a press brush to improve the operation rate of the machine. To aim.

<Means for Solving the Problems> A folding machine of a rotary printing press of the present invention for achieving the above-mentioned object is provided with a first gripper cylinder for performing a first parallel folding of a signature and a first gripper cylinder. A second gripper cylinder that makes a second parallel fold of the signatures facing each other, and a receiving cylinder that has a gripper claw on the outer peripheral portion that is in contact with the first gripper cylinder, and the signature folded once in parallel Parallel to the first transport path that is ejected through the cylinder 1
A folding machine of a rotary printing press having a second transport path in which a folded signature is folded twice in parallel by the second gripper cylinder and ejected, wherein the first gripper cylinder is provided on the first transport path. A first pressing member for pressing the signature released from the first holding cylinder with the peripheral surface of the first holding cylinder is provided so as to be able to approach and separate from the outer peripheral surface of the first holding cylinder while being on the second transport path. The paper edge side of the signature with the first gripper
A second press-contact member that press-contacts the peripheral surface of the gripper cylinder is provided so as to be able to move toward and away from the outer peripheral surface of the first gripper cylinder, and the first press-contact member is moved to the first gripper based on a command signal of parallel one-fold. The second press-contact member is moved away from the first gripper cylinder while being pressed against the outer peripheral surface of the cylinder, and the first press-contact member is moved around the outer periphery of the first gripper cylinder based on a command signal of parallel double bending. Drive control means is provided for moving the second pressure contact member close to the outer peripheral surface of the first gripping cylinder while pressing the second pressure contact member away from the surface.

<Operation> In the case of parallel bending once, the first pressure contact member is pressed against the peripheral surface of the first gripping cylinder by the drive control means on the first transport path based on the command signal of parallel bending once. The signature released from the one gripping cylinder is held between the peripheral surface of the signature and conveyed to the receiving cylinder. At this time, the second pressing member is separated from the peripheral surface of the first gripper cylinder.

Further, at the time of parallel two-fold, the second pressing member is pressed against the peripheral surface of the first gripper cylinder by the drive control means on the second transport path based on the parallel-two-fold command signal. The gripper cylinder presses the paper tail side of the gripped signature against its peripheral surface and conveys it to the second gripper cylinder. At this time, the first
The press contact member is separated from the peripheral surface of the first gripper cylinder.

<Example> Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a cylinder arrangement diagram of a folding machine of a rotary printing press according to an embodiment of the present invention, FIG. 2 is a front view of feed rollers, and FIG.
III-III sectional view, FIG. 4 is a front view of the presser brush, FIG. 5 is a sectional view taken along line VV of FIG. 4, FIG. 6 is a sectional view taken along line VI-VI of FIG. 5, and FIG. FIG. 7 is a sectional view taken along line VII-VII, and FIG. 8 is a drive circuit diagram for the feed roller and the presser brush.

As shown in FIG. 1, the printed web 11 is cooled and dried.
Is guided to the parallel folding device 12 of the folder. Parallel folding device 12
Is a cutting cylinder 13, folding cylinder 14, first gripping cylinder 15, second gripping cylinder
16, a reduction cylinder 17, which is a receiving cylinder for receiving the signatures from the first gripping cylinder 15, and upper and lower transfer cylinders 18, 19, which are rotationally driven in synchronization with each other in a direction indicated by an arrow in the figure. It has become. Among them, the cutting cylinder 13 and the folding cylinder 14 are provided with a plurality of needles arranged in parallel with a cutting blade 20 for cutting the web 11 into predetermined dimensions and abutting the lower half circumferential surface of the folding cylinder 14. 21 and 21 are arranged so as to face each other at a position that divides the circumferential surfaces of the two bodies 13, 14 into two equal parts in the circumferential direction. Further, on the outer peripheral portion of the folding cylinder 14, two rows of insertion knives 22 are provided which are arranged in parallel in the axial direction and are set at a substantially middle position between both needles 21 in the circumferential direction. On the other hand, at a position where the circumferential surface of the first holding cylinder 15 is divided into two equal parts in the circumferential direction, a holding plate 23 having a plurality of sets arranged in parallel in the axial direction faces each of the insertion knives 22. It is arranged. Further, at a position where the circumferential surface of the first gripper cylinder 15 is divided into two equal parts in the circumferential direction, two rows of insertion knives 24, each of which is a set of a plurality arranged in parallel in the axial direction, are provided more than the gripper plate 23. It is arranged at a position that lags behind the rotation direction by about 45 °.
Further, at a position where the circumferential surface of the second holding cylinder 16 for parallel bi-folding is divided into two equal parts in the circumferential direction, a plurality of pieces arranged in parallel in the axial direction are provided.
Two rows of gripping plates 25 are arranged facing each insertion knife 24. The cylinders 13, 14, 15 and 16 described above have the same diameter and rotate at the same peripheral speed. A clutch (not shown) is provided at the end of the rotary shaft of the second gripper cylinder 16 so that the second gripper cylinder 16 can be rotated without connecting the clutch by the operation switch 81 described later only when performing parallel two-fold bending. It has become.

The reduction cylinder 17 is provided on the front side of the second gripping cylinder 16 in the transport path of the signature, and is approximately 1.5 times larger than that of the first gripping cylinder 15.
It has a double diameter, and at the position where the peripheral surface is divided into four substantially in the circumferential direction, a plurality of groups arranged in parallel in the axial direction are set as 4
There is a gripper claw 26 consisting of a row of claws and a claw base,
By setting the peripheral speed of the reduction cylinder 17 to be lower than the peripheral speed of the first gripper cylinder 15, even if there is a difference in the ratio of the number of the gripper plates 23 and the gripper jaws 26 and the diameter ratio of the two cylinders 15,17. The grip plate 23 and the grip claw 26 are configured to face each other. Also,
The upper and lower transfer cylinders 18 and 19 have different diameters and rotate at the same rotation ratio as the reduction cylinder 17, and are located at positions that divide each circumferential surface into two equal parts in the circumferential direction.
Gripping jaws 27 and 28, which are composed of two sets of claws arranged in parallel in the axial direction and one set of claws, are provided at positions facing the gripping claw 26 by rotation. In addition, each transfer barrel 18,19
A chopper device (not shown) is disposed on the downstream side of each of them via transport belts 29 and 30.

An impeller 31 as a paper discharge device is arranged downstream of the second gripper cylinder 16.

In such a cylinder arrangement, when each cylinder rotates and the web 11 is fed between the cutting cylinder 13 and the folding cylinder 14, the web is
11 is cut by a cutting blade 20 to a predetermined size, and the web 11 following the cutting line is held by a needle 21 and wound around the lower semicircular surface of the folding cylinder 14, and its paper tail end is It is cut by the cutting blade 20 in the same manner as above. Then, the cutting web held by the needle 21 is wound around the folding cylinder 14 until the central portion in the longitudinal direction reaches the opposite contact points of the two cylinders 14 and 15, and the insertion knife 22 and the holding plate 23 face each other. Therefore, the center of the cutting web is gripped by the gripper plate 23 by the cooperation of the insertion knife 22 and folded in half to form a signature, which is attached to the upper peripheral surface of the first gripper cylinder 15.

Here, when the signature of the signature is one-fold parallel, the above-mentioned half-fold signature is gripped by the gripper plate 23 of the first gripper cylinder 15 to the gripper claw 26 of the reduction cylinder 17. That is, when the gripping plate 23 and the gripping claw 26 approach the contact position, the gripping plate 23 releases the signature held by the gripping plate 23, and then the gripping claw of the speed reducer body 17 is released.
By closing 26 and gripping the tip of the signature, the signature is transferred from the first gripper cylinder 15 to the reduction cylinder 17. afterwards,
The signature held in the gripper 26 is first gripped by the gripper 28 of the lower transfer cylinder 19 and conveyed, and the subsequent signature is gripped by the gripper 27 of the upper transfer cylinder 18 and conveyed. It The signatures thus alternately conveyed by the upper and lower transfer cylinders 18, 19 are discharged onto the respective conveyor belts 29, 30.

On the other hand, when the signature of the signature is double-folded, the signature gripped by the gripper plate 23 of the first gripper cylinder 15 passes through the position of contact with the reduction cylinder 17 and the second gripper cylinder 16 It reaches to the upper peripheral surface of the second gripper cylinder 16 while being gripped by the gripper plate 25 of the second gripper cylinder 16 by the insertion knife 24 of the first gripper cylinder 15 and being half-folded for the second time. Contacted. The signature folded in parallel twice is then discharged onto the impeller 31. In the case of this two-fold parallel bending, the holding plate 23 of the first holding cylinder 15 is not opened at a position facing the reduction cylinder 17 and is closed until the above-mentioned second holding cylinder 16 is delivered, By exchanging the opening / closing drive cam and shifting the rotational phase of the reduction cylinder 17 with respect to the first gripping cylinder 15,
Make sure 26 does not touch the signature as it passes.

As described above, the above-described parallel folding device 12 has the first transport path for performing the parallel 1-fold and the second transport path for performing the parallel 2-fold.

As shown in FIG. 1, the signature released from the first gripper cylinder 15 is rotated on the first transport path while being clamped between the signature and the outer peripheral surface of the first gripper cylinder 15 to rotate the signature. Reducer torso
A feed roller 41 for carrying to 17 is provided.

As shown in FIG. 2 and FIG. 3, a roller shaft 42 is loosely fitted in a slot 44 formed in a frame 43 on one side adjacent to the gripper cylinder 15 and in parallel therewith. Is the first
Gear 45 is fixed. A plurality of (three in this embodiment) feed rollers 41 described above are fixed in parallel on the roller shaft 42 at a predetermined interval. The feed roller 41 includes an annular small-diameter roller base 46 fixed to the roller shaft 42 and an outer peripheral surface of the roller base 46.
It is composed of a fan-shaped large-diameter portion 48 fixed with a bolt 47 so as to be concentric with 42, and the outer peripheral surface of the large-diameter portion 48 is a gripper cylinder 15
Has a size capable of engaging with the peripheral surface of the.

A support shaft 49 is fixed to each of the left and right frames 43, and a base end portion of a connecting member 50 is rotatably connected to the support shaft 49, and a tip end portion of the connecting member 50 is connected to the frame 43.
Inner ends of the roller shaft 42 are connected to each other via bearings 51. Further, the tip of the cylinder shaft of the air cylinder 52 supported by the frame 43 is connected to the tip of the connecting member 50. Then, one of the support shafts 49 has the above-mentioned first
A second gear 53 meshing with the gear 45 is pivotally attached. A drive gear 55 of a drive device (not shown) is meshed with the second gear 53 via a third gear 54 so that the roller shaft 42 makes one rotation each time one signature is conveyed by the gripper cylinder 15. Has become.

Further, a projecting piece 56 projecting outward is integrally formed at the base end of the connecting member 50. And this protruding piece 56 is a frame
By contacting the stopper 57 provided on the 43, the connecting member
The rotation position of the 50 in the clockwise direction in FIG. 2 can be regulated. The stopper 57 is composed of a main body 58 fixed to the frame 43, and a moving body 59 that is screwed into the main body and has its tip abutting against the projecting piece 56. The rotation position changes, which causes the feed roller 41
The pressure contact force of the gripper cylinder 15 against the peripheral surface can be adjusted.

An air pressure supply device (not shown) is connected to the air cylinder 52.

By operating the air cylinder 52, the feed roller 41 can be moved between a position where it is pressed against the peripheral surface of the first holding cylinder and a position where it is separated from the peripheral surface.

Further, a holding brush 61 is provided on the second conveying path to press the paper tail side of the signature held by the first holding cylinder 15 against the peripheral surface of the first holding cylinder 15.

As shown in FIGS. 4 to 6, L-shaped mounting brackets 62 are fixed to the inner surfaces of the left and right frames 43, and guide members 63 are fixed to the respective mounting brackets 62. A movable plate 64 is supported by 62 and a guide member 63 so as to be movable in a direction orthogonal to the peripheral surface of the first gripper cylinder 15. This moving plate 64 has a first gripping body 15
The base end of an L-shaped bracket 65 that is long along the direction of the rotation axis and is arranged in parallel in the same direction is fixed. And
The tip part has a curved surface along the peripheral surface of the first holding cylinder 15,
A pressing brush 61 for pressing the paper edge side of the signature held by the first holding cylinder 15 is attached.

An air cylinder 67 is mounted on each mounting bracket 62. The tip of the piston shaft 68 of the air cylinder 67 is connected to the other end of an L-shaped connecting piece 69, one end of which is connected to each end of the moving plate 64.

An air pressure supply device (not shown) is connected to each air cylinder 67.

Thus, the pressing brush 61 can be moved to a position pressed against the peripheral surface of the first gripping cylinder and a position separated from the peripheral surface by operating each air cylinder 67.

As shown in FIG. 1, an operation window 71 is provided at an appropriate position of the parallel folding device 12, and can be opened and closed by a safety cover 72. As shown in FIG. 7, the safety cover 72 is composed of a window glass 73 and a frame body 74, and a side portion of the frame body 74 is attached to one side of the operation window 71 formed on the frame 43 by a hinge 75. A limit switch 77 is fixed to the inside of the operation window 71 via a bracket 76. This limit switch 77 is for preventing the operator's hand from being caught between the cylinders, the feed rollers 41, the presser brush 61, etc., and when the safety cover 72 is opened, that is, When the limit switch 77 is off, the feed roller 41 and the presser brush 61 cannot move.

FIG. 8 shows a drive control circuit for controlling the drive of the feed roller 41 and the pressing brush 61 described above. This drive control circuit brings the feed roller 41 into close contact with the outer peripheral surface of the first gripper cylinder 15 based on the command signal of parallel bending once, while pressing the brush.
61 is moved away from the first gripping cylinder 15, and the feed roller 41 is moved away from the outer peripheral surface of the first gripping cylinder 15 on the basis of the parallel bi-folding command signal, while the presser foot 61 is moved to the first gripping cylinder.
It is driven so that the outer peripheral surface of 15 is brought into close contact with and pressed against. As shown in FIG. 8, the power source 80 has a second gripper 16
The operation switch 81 of is connected and the second gripper 16
The operating clutch drive coil 82 and the first detachable drive coils 83 for the feed roller 41 and the presser brush 61 are connected in parallel and grounded. A limit switch 77 of the safety cover 72 is provided on the side of the first drive coil 83. Further, a contact 84 and a second drive coil 85 of the first drive coil 83, and a non-contact 86 and a third drive coil 87 are connected in parallel to the power source 80, respectively. Further, the power source 80 includes a contact 88 of the second drive coil 85, a non-contact 89 of the third drive coil 87, and a feed roller.
41 for attaching and detaching each of 41 and the pressing brush 61, contact 91 of the third drive coil 87, non-contact 9 of the second drive coil 85
2. The detachable second solenoids 93 of the feed roller 41 and the pressing brush 61 are connected in parallel.

Thus, when the operation switch 81 is off, the actuating clutch drive coil 82 of the second gripper cylinder 16 and the detachable first drive coil 83 of the feed roller 41 and the presser brush 61 are not excited.
The power supply 80 conducts to the non-contact 86 and the third drive coil 87 to excite the drive coil 87, and the contact 91 and the second drive coil 85.
The non-contact 92 and the second solenoid 93 are electrically connected. Therefore, the air pressure supply device is driven by the second solenoid 93,
The air cylinder 52 operates and the feed roller 41 moves the first gripper cylinder 15
While being pressed against the peripheral surface of the first holding cylinder 61, the air cylinder 67 is operated to separate the pressing brush 61 from the peripheral surface of the first holding cylinder 15.

Also, when the operation switch 81 is turned on, the second gripper 16
The operating clutch drive coil 82 and the first detachable first drive coil 83 of the feed roller 41 and the presser brush 61 are excited, and the power source 80 conducts to the contact 84 and the second drive coil 85, and the drive coil 85 Excited, contact 88, third drive coil
The non-contact 89 of 87 and the first solenoid 90 are electrically connected. Therefore,
The pneumatic solenoid is driven by the first solenoid 90, and the air cylinder 52 is actuated to move the feed roller 41 away from the peripheral surface of the first gripper cylinder 15, while the air cylinder 67 is actuated to move the presser brush 61 to the first position. It is pressed against the peripheral surface of the gripper body 15.

In the folder of the rotary printing press of this embodiment described above, the operation of the feed roller 41 and the presser brush 61 will be described below.

When performing one parallel bending, the signature passes through the first transport path. At this time, the operation switch 81 is in the off state, and as described above, the feed roller 41 is pressed against the peripheral surface of the first gripper cylinder 15, while the pressing brush 61 is separated from the peripheral surface of the first gripper cylinder 15. is doing. Thus, as the gripper cylinder 15 rotates, the signature held by the gripper plate 23 of the gripper cylinder 15 is conveyed while being attached to the upper peripheral surface of the gripper cylinder 15. At this time, the roller shaft 42 is also rotationally driven, and the feed roller 41 keeps the small-diameter roller base 46 facing the signature until the holding plate 23 holding the signature has finished passing through the feed roller 41. Then, when the grip end of the signature has finished passing the feed roller 41, the large diameter portion 48 of the feed roller 41 faces the signature, and the signature gripper cylinder 15
Press on. Immediately after that, the gripper plate 23 of the gripper body 15 is opened to release the signature from the gripper.

After that, the signature that has become free due to the opening of the gripper plate 23 is fed to the reduction cylinder 17 while being decelerated by the contact pressure of the feed roller 41.

When performing the parallel two-fold, the signature passes through the second transport path. At this time, the operation switch 81 is in the ON state, and as described above, the feed roller 41 is separated from the peripheral surface of the first gripper cylinder 15, while the pressing brush 61 is pressed against the peripheral surface of the first gripper cylinder 15. ing. Thus, the signature gripped by the gripper plate 23 of the first gripper cylinder 15 passes through the position of contact with the reduction cylinder 17 and reaches the second gripper cylinder 16. At this time, the trailing edge of the signature is pressed against the peripheral surface of the first gripper cylinder 15 by the pressing brush 61, so that the misalignment of the paper is prevented. After that, the signature is folded twice in parallel by the second gripper cylinder.

As described above, by separating the holding brush 61, which is not used when the parallel bending is performed once, from the peripheral surface of the first holding cylinder 15, the wear of the holding brush 61 can be reduced. Also,
By separating the feed roller 41, which is not used when performing parallel two-fold bending, from the peripheral surface of the first gripper cylinder 15,
Wrinkles and rubbing of signatures that pass under 41 can be prevented.

Although the two-stage chopper type folding machine has been described as an example in the above-described embodiment, the present invention is not limited to this, and is also applied to folding machines forming other cylinder arrangements. Is something that can be done.

<Effects of the Invention> As described above in detail with reference to the embodiments, according to the folding machine of the rotary printing press of the present invention, the first press-contact member is provided on the first conveying path that performs parallel one-fold. , A second press-contact member is provided on the second conveying path that performs parallel two-fold, and the first press-contact member is brought into close contact with the outer peripheral surface of the first gripping cylinder based on the command signal of the parallel one-fold and press-contacts. The second pressure-contact member is moved away from the first gripper cylinder, and the first pressure-contact member is moved away from the outer peripheral surface of the first gripper cylinder on the basis of the parallel two-fold bending command signal, while the second pressure-contact member is moved away from the first gripper cylinder. Since the drive control means for bringing the first press contact member and the second press contact member into close contact with the outer peripheral surface is provided, the first press contact member and the second press contact member are brought into press contact with the outer peripheral surface of the first holding cylinder only when they are used, and are separated when not used, Wear of each member can be reduced and life can be extended. . As a result, the replacement frequency and the replacement time of consumable parts such as the feed roller and the presser brush used as the pressure contact member are reduced, and the operating rate of the folding machine can be improved.

[Brief description of drawings]

FIG. 1 is a cylinder arrangement diagram of a folding machine of a rotary printing press according to an embodiment of the present invention, FIG. 2 is a front view of feed rollers, and FIG.
III-III sectional view, FIG. 4 is a front view of the presser brush, FIG. 5 is a sectional view taken along line VV of FIG. 4, FIG. 6 is a sectional view taken along line VI-VI of FIG. 5, and FIG. FIG. 7 is a sectional view taken along line VII-VII, and FIG. 8 is a drive circuit diagram for the feed roller and the presser brush. In the drawing, 12 is a parallel folding device, 14 is a folding cylinder, 15 is a first holding cylinder, 16 is a second holding cylinder, 17 is a reduction cylinder (reception cylinder), 26 is a holding jaw,
41 is a feed roller (first pressure contact member), 52 is an air cylinder, 61
Is a presser brush (second pressure contact member), and 67 is an air cylinder.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-27376 (JP, A) JP-A-60-6562 (JP, A) Actual opening 63-17169 (JP, U) Actual opening Sho-63- 17170 (JP, U) Actually opened 63-161264 (JP, U) Actually opened 62-157864 (JP, U)

Claims (1)

[Scope of utility model registration request] 1. A first gripper cylinder for performing a first parallel folding of a signature, a second gripper cylinder facing the first gripper for performing a second parallel folding of a signature, and the first gripper cylinder. A signature cylinder which has a gripper claw on the outer peripheral portion and is opposed to the first cylinder, and the signature which is bent once in parallel is ejected through the first cylinder and the signature which is bent once in parallel. A folding machine for a rotary printing press, comprising: a second transport path that is folded twice in parallel by a second gripper cylinder and is discharged; and a signature released from the first gripper cylinder on the first transport path. A first press-contact member, which comes into pressure contact with the peripheral surface of the first gripper cylinder, is provided so as to approach and separate from the outer peripheral surface of the first gripper cylinder, while the first gripper cylinder is gripped on the second transport path. A second press-contact member that presses the paper tail side of the signature against the peripheral surface of the first gripper cylinder is provided outside the first gripper cylinder. The first press-contact member is provided so as to be able to approach and separate from the peripheral surface so as to approach the outer peripheral surface of the first gripping cylinder and press-contact with the second press-contact member on the basis of a command signal of parallel bending once. The first press-contact member is moved away from the first gripper cylinder, and the first press-contact member is moved away from the outer peripheral surface of the first gripper cylinder on the basis of the parallel double-bend command signal, while the second press-contact member is moved to the outer periphery of the first gripper cylinder. A folding machine for a rotary printing press, which is provided with a drive control unit that is brought into close contact with a surface and presses.