JP2001191488A - Reversing cylinder device for convertible perfector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the easy and positive confirmation of a state of a back gripper device, with regard to a reversing cylinder device to be mounted on a convertible perfector. SOLUTION: In a reversible cylinder 1 equipped with a gripper device 110 consisting of a front gripper device 2 and a back gripper device 3 mounted on the convertible perfector, a switching mechanism 120 is provided which sets the back gripper device 3 in an operating position during perfecting in which a printing sheet 4 needs to be reversed and sets the back gripper device 3 in a non-operating position during one side printing in which the printing sheet 4 need not be reversed. In addition, a motion detector 7 which detects the state of actuating pieces 6a, 6b to be interlocked with the switching mechanism 120, is installed in the reversing cylinder 1 so that it is detected whether the back gripper device 3 is used or not. Further, an electromagnetic coupling non-contact sensor 8 is provided which outputs a detection signal by the motion detector 7 to the outside of the reversing cylinder 1 with the help of a sending part 8a which is installed inside the reversible cylinder 1 and sends the detection signal from the motion detector 7 and a receiving part 8a which is installed outside the reversing cylinder 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reversing cylinder device mounted on a double-sided printing press, and more particularly to the use of a reverse claw device.
The present invention relates to a reversing cylinder device of a double-sided printing press having a detector for detecting non-use and a non-contact sensor.

[0002]

2. Description of the Related Art FIGS. 4 and 5 are views showing a reversing cylinder device of a conventional double-sided printing press. FIG. 4 is a schematic diagram showing the reversing cylinder device, and FIG. FIG.
In these drawings, hatching indicating a broken state is omitted. As shown in FIG. 4, the reversing cylinder device includes a reversing cylinder 1, a reversing double cylinder 51, and an intermediate cylinder 25, and is provided between two printing units 100A and 100B. Each printing unit 100A, 100B has an impression cylinder 71, a blanket cylinder 81,
[FIG. 4A shows only the details of the downstream printing unit 100B in FIG. 4, but FIG. 4B does not show the blanket cylinder 81 and the plate cylinder 82. In a sheet-fed printing press or the like, they are arranged in the traveling direction of the printing paper 4 for each ink color.

[0003] The reversing cylinder device is a printing unit on the upstream side during duplex printing (only a part of the impression cylinder 71 is shown by a two-dot chain line).
The printing paper 4 is transferred from the upstream printing unit 100A to the downstream printing unit 100B without reversing the printing paper 4 from the upstream printing unit 100A to the downstream printing unit 100B during single-sided printing. To work.

The blanket cylinder 81, plate cylinder 82, reversing cylinder 1,
The intermediate cylinders 25 are all cylinders having the same diameter, and the impression cylinder 71 and the reversing double cylinder 51 have twice the diameter of the blanket cylinder 81, the plate cylinder 82, the reversing cylinder 1, and the intermediate cylinder 25. A plate (printing plate) 83 for printing is mounted on the outer peripheral surface of the plate cylinder 82, and the blanket cylinder 81 is
It is arranged so as to contact at 0A and transfer the print pattern to the blanket cylinder 81. The blanket cylinder 81 contacts the impression cylinder 71 at a tangent line 50B different from the tangent line 50A on the cylinder circumference. At this tangent line 50B, a predetermined amount of printing paper 4 is transferred from the upstream side along the outer peripheral surface of the impression cylinder 71. Is printed.

At another tangent line 50F on the circumference of the cylinder, the intermediate cylinder 25 is attached to the impression cylinder 71 of the printing unit 100A on the upstream side.
Is in contact. The reversing cylinder 1 and the reversing double cylinder 51 of the reversing cylinder device are arranged so as to be in contact with each other at a tangent line 50C, and the reversing double cylinder 51 is in contact with the intermediate cylinder 25 at another tangential line 50D on the trunk circumference. Further, the reversing cylinder 1 is disposed so as to be in contact with the impression cylinder 71 of the downstream printing unit 100B at a tangent line 50E opposite to the reversing double cylinder 51.

[0006] All the cylinders mentioned above, ie the impression cylinder 7
1, blanket cylinder 81, plate cylinder 82, reversing cylinder 1, reversing double cylinder 51,
Each of the intermediate cylinders 25 is arranged so that the rotation axes are parallel to each other, and is supported by a frame of a printing press main body (not shown). For example, the adjacent cylinders are connected to each other via gears (not shown). Are connected to each other so that they rotate synchronously at the same peripheral speed.

On the outer periphery of the impression cylinder 71, the reversing cylinder 1, the reversing double cylinder 51, and the intermediate cylinder 25, claw devices 78 for transferring the printing paper 4 conveyed from the upstream side to the downstream side, respectively. 110, 58, 68 are pivotally supported by respective claw shafts provided on the frame of each body. That is, on the outer periphery of the impression cylinder 71, a pair of holding claws 78a and pawl seats 78 are provided.
b are disposed at two positions equidistant from each other on the outer periphery of the impression cylinder 71 (only one claw device 78 is shown in FIG. 4). In these claw devices 78, the holding claws 78a and the claw seats 78b are provided with the impression cylinder 71.
The printing paper 4 can be gripped and released by a gripper 78a and a pawl seat 78b by a driving device (not shown) by a claw shaft 78c parallel to the rotation axis of the printing paper. These two claw shafts 78c are supported by the frame of the impression cylinder 71.

On the outer periphery of the reversing double body 51, a claw device 58 including a pair of holding claws 58a and a claw seat 58b is provided.
They are arranged at two places on the outer circumference of the reversing double cylinder 51 at equal intervals. In these claw devices 58, the claw 58a
And a claw seat 58b are provided with claw shafts 58 parallel to the rotation axis of the reversing double body 51.
The print paper 4 can be gripped or released by a gripper 58a and a pawl seat 58b by a driving device (not shown). These two claw shafts 58c are supported by a frame of the reversing double cylinder 51.

Further, a claw device 68 comprising a pair of holding claws 68a and a claw seat 68b is arranged on the outer periphery of the intermediate body 25. In the claw device 68, the claw 68a and the claw seat 68b are provided with a claw shaft 68c parallel to the rotation axis of the intermediate body 25.
The printing paper 4 can be gripped and released by the gripper 68a and the claw seat 68b by a driving device (not shown). This claw shaft 68
c is supported by the frame of the intermediate cylinder 25.

As shown in FIGS. 4 and 5, on the outer periphery of the reversing cylinder 1, a claw device 110 including a pair of a front claw device 2 and a back claw device 3 is disposed. The front nail device 2 includes a pair of grip nails 2a and a nail seat 2b, and the back nail device 3 includes a pair of grip nails 3a and a nail seat 3b. The front pawl device 2 is supported by a pawl shaft 21 parallel to the rotation axis of the reversing cylinder 1 so that the gripper 2a and the pawl seat 2b can grip and release the printing paper 4 by a driving device (not shown). Has become. Further, the back claw device 3 is supported by a claw shaft 22 parallel to the rotation axis of the reversing cylinder 1 so that the holding claw 3a and the claw seat 3b can grip and release the printing paper 4 by a driving device (not shown). It has become. These two claw shafts 21 and 22 are supported by the frame of the reversing cylinder 1.

The front claw device 2 and the back claw device 3 are in a posture where they are outwardly facing each other (outward posture) as shown in FIG. 5 (a), and when both are outwardly facing each other as shown in FIG. 5 (b). It is configured to be rotatable between an inward posture (inward posture). At this time, the front claw device 2 rotates around the claw shaft 21, and the back claw device 3 rotates around the claw shaft 22.

The back claw device 3 is used only during double-sided printing, and is configured to be in a retracted state (unused state) in an outward posture during single-sided printing. When the pawl device 78 (not shown) provided on the impression cylinder 71 of the upstream printing unit 100A comes to the position of the tangent line 50F, the intermediate cylinder 2
The fifth claw device 68 is also set to come to the position of this tangent line 50F. In addition, the claw device 68 of the intermediate body 25 is
When it comes to the position of 0D, the claw device 58 of the reversing double cylinder 51 is also set to come to the position of this tangent 50D.

Further, when the pawl device 58 of the reversing double cylinder 51 comes to the position of the tangent 50C, the front pawl device 2 of the reversing cylinder 1 is also set to come to the position of the tangent 50C. When the front nail device 2 of the reversing cylinder 1 comes to the position of the tangent line 50E, the nail device 78 provided on the impression cylinder 71 of the downstream printing unit 100B is also set to come to the position of this tangent line 50E. . Further, when the end 4b of the printing paper 4 held by the claw device 58 of the reversing double cylinder 51 reaches the position of the tangent 50C, the back claw device 3 of the reversing cylinder 1 is also set to come to the position of the tangent 50C. Have been.

The claw shaft 21 supporting the front claw device 2
Is connected to a rotating device (not shown) for rotating the front nail device 2 between the outward posture and the inward posture and for maintaining the dip posture. This rotating device creates a state of the claw shaft 21 corresponding to the use or non-use state of the front claw device 2 by a mechanism such as a cam. Similarly,
The claw shaft 22 that supports the back claw device 3 is used to rotate the back claw device 3 between the outward posture and the inward posture (use state) or to change the back claw device 3 to the nonuse state (retracted state) while maintaining the diplomatic posture. Is connected to a rotating device (not shown).

Thus, during double-sided printing, it acts on the front nail device 2 and the back nail device 3, and both of them rotate between the outward posture and the inward posture, and the front nail device 2 and the back nail device 3 The printing paper 4 can be exchanged between them. Further, at the time of single-sided printing, both the front nail device 2 and the rear nail device 3 are held in the outward posture, and the rear nail device 3 is not used, and only the front nail device 2 is operated, so that the upstream trunk (ie, The transfer of the printing paper 4 is performed between a reversing double cylinder) 51 and a downstream cylinder (that is, an impression cylinder) 71.

Accordingly, the printing paper 4 sent one by one from a paper feeding device (not shown) is transferred to the printing unit 10 on the upstream side.
After printing is performed by the impression cylinder 71 of 0A, the leading end 4 of the printing paper 4 gripped by a claw device (not shown) 78 on the outer periphery of the impression cylinder 71 at a tangent line 50F between the impression cylinder 71 and the intermediate cylinder 25.
a is held by the claw device 68 of the intermediate body 25. In conjunction with this, the pawl device 78 of the impression cylinder 71 releases the leading end 4 a of the printing paper 4, and the printing paper 4 is transported while the leading end 4 a is gripped by the pawl device 68 and wrapped around the circumference of the intermediate drum 25. Is done. By this transfer, the front and back of the printing paper 4 are reversed. At the tangent line 50D to the reversing double cylinder 51, the claw device 58 of the reversing double cylinder 51 grips the leading end 4a of the printing paper 4 gripped by the claw device 68 on the outer periphery of the intermediate cylinder 25. In conjunction with this, the pawl device 78 of the intermediate cylinder 25 releases the leading end 4 a of the printing paper 4, and the printing paper 4 is gripped by the pawl device 58 and wrapped around the periphery of the reversing double cylinder 51. Conveyed. The delivery to the reversing double cylinder 51 turns the printing paper 4 upside down.

Here, when the printing paper 4 is printed on both sides, the back nail device 3 rotates between the outward posture and the inward posture, and the front nail device 2 moves outwardly in conjunction with the back nail device 3. The printing paper 4 rotates between the posture and the inward posture, and the printing paper 4
From the front nail device 2. Therefore, the tangent 50C
In FIG. 4 (a), as shown in FIG.
Grips the end 4 b of the printing paper 4, and in conjunction with this, the claw device 58 of the reversing double cylinder 51 releases the leading end 4 a of the printing paper 4, and the printing paper 4 moves from the reversing double cylinder 51 to the reversing cylinder 1. Passed to. Then, the front nail device 2 and the end 4 of the printing paper 4
5B is changed from the outward posture illustrated in FIG. 5A to the inward posture illustrated in FIG. 5B, and the front nail device 2 grips the end 4 b of the printing paper 4. At the same time, the back nail device 3 releases the end 4b of the printing paper 4 and the printing paper 4
Is transferred from the back nail device 3 to the front nail device 2.

Thereafter, the front nail device 2 holding the end 4b of the printing paper 4 and the back nail device 3 releasing the end 4b of the printing paper 4 return to the outward posture again. By this operation, the printing paper 4 is turned upside down. That is, the back nail device 3
The trailing end 4b of the printing paper 4 that has been gripped is gripped by the front nail device 2 as the leading end 4a in the traveling direction and is conveyed while being wound around the reversing cylinder 1. At this time, the front and back of the printing paper 4 are not reversed.

When the printing paper 4 is to be printed on one side, the back claw device 3 is held in a non-use state (retracted state) in an outward posture, and the front claw device 2 is also held in an outward posture. 2, the printing paper 4 is transferred from the upstream cylinder (that is, the reversing double cylinder) 51 to the downstream cylinder (that is, the impression cylinder) 71. Then, the front end 4a of the printing paper 4 gripped by the claw device 58 of the reversing double cylinder 51 at the tangent line 50C is
The nail device 58 interlocks with the printing paper 4
Is released, and the printing paper 4 is transferred from the reversing double cylinder 51 to the reversing cylinder 1. At this time, the front and back of the printing paper 4 are reversed.

Thereafter, in both the double-sided printing and the single-sided printing, the leading end 4a of the printing paper 4 held by the front nail device 2 of the reversing cylinder 1 is used.
Reaches the tangent line 50E to the impression cylinder 71, the claw device 78 of the impression cylinder 71 grips the leading end 4a of the printing paper 4, and in conjunction with this, the front nail device 2 releases the leading end 4a of the printing paper 4. hand,
The printing paper 4 is transferred from the reversing cylinder 1 to the impression cylinder 71. At this time, the front and back of the printing paper 4 are reversed. Therefore, at the time of double-sided printing, three inversions at the tangent lines 50F, 50D, and 50E cause the impression cylinder 7 of the downstream printing unit 100B to rotate.
1, the upstream printing unit 100A
Is turned upside down when it is wrapped around the impression cylinder 71, and at the time of single-sided printing, the tangential lines 50F, 50D, 50C, and 50E are turned over four times, so that the downstream printing unit 100 on the downstream side is printed.
When wrapped around the impression cylinder 71 of B, the front and back are the same as when wrapped around the impression cylinder 71 of the upstream printing unit 100A.

The printing paper 4 conveyed while being wound on the surface of the impression cylinder 71 is subjected to predetermined printing from the blanket cylinder 81 at the tangent line 50B, and is sent to the next printing unit. In this manner, multi-color double-sided printing or multi-color single-sided printing is performed on the printing paper 4 via the plurality of printing units.

[0022]

By the way, in order to properly manage the above-described reversing cylinder device of a double-sided printing machine,
It is necessary to monitor whether the back claw device 3 of the reversing cylinder 1 is in use or not in use outside the reversing cylinder device. Therefore,
As a technique for confirming the operation stop state of the back claw device 3, a detection device 30 including proximity pieces 29a and 29b and proximity switches 31a and 31b as shown in FIG. 6 can be considered. The proximity pieces 29a and 29b are fixed to the shaft 10a interlocking with the claw shaft 22 of the back claw device 3 at a predetermined angle to each other.

Therefore, these proximity pieces 29a, 29b
Takes a posture interlocked with the shaft 10a, and when the shaft 10a rotates clockwise, as shown in FIG. 6A, one proximity piece 29a and the proximity switch 31a approach each other and face each other.
As shown in FIG. 6B, when 0a rotates counterclockwise, the other proximity piece 29b and the proximity switch 31b are set so as to approach and face each other. Of course, the proximity pieces 29a and 29b are provided inside the reversing cylinder 1, and the proximity switches 31a and 31b are located at positions slightly away from the reversing cylinder 1 in the radial direction of the reversing cylinder 1 with respect to the proximity pieces 29a and 29b. Is fixed to the apparatus frame via the bracket 31c.

The signals from the proximity switches 31a and 31b are transmitted to the control device 19 outside the reversing cylinder device via the wiring 42. By rotation of the shaft 10a, for example, the proximity piece 29a and the proximity switch 31a
Can be detected when the back claw device 3 is in use, and when the proximity piece 29b and the proximity switch 31b face each other, it can be detected that the back claw device 3 is not in use. it can.

However, in the detecting device 30 having such a configuration, the proximity pieces 29a and 29b are provided in the rotating reversing cylinder 1, and the proximity switches 31a and 31b are provided outside the reversing cylinder 1. 29a and proximity switch 31
a, it is necessary to arrange the proximity piece 29b and the proximity switch 31b such that they can approach each other by a very small distance. For this reason, the proximity pieces 29a and 29b are
When a phase that goes outside from a occurs, or when the components of the detection device 30 and the reversing cylinder 1 are abnormally operated,
The proximity pieces 29a, 29b and the like may interfere with the adjacent trunk, which may cause damage to the trunk. The detection device 30
In order to function accurately, the proximity pieces 29a and 29b and the proximity switches 31a and 31b need to be accurately opposed to each other, and the stopping accuracy of the reversing cylinder 1 must be set accurately. There is also a problem that it takes time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and enables the state of a back claw device mounted on a reversing cylinder to be easily and reliably confirmed without interfering with the operation of the reversing cylinder. Accordingly, it is an object of the present invention to provide a reversing cylinder device of a duplex printing machine capable of improving quality accuracy and productivity.

[0027]

According to the present invention, there is provided a reversing cylinder device for a duplex printing press according to the present invention, wherein the reversing cylinder mounted on the duplex printing press and the outer periphery of the reversing cylinder are paired with each other. And a claw device comprising a front claw device and a back claw device provided in such a manner that the printing paper is transferred to each other by the front claw device and the back claw device during the double-sided printing, thereby inverting the front and back of the printing paper. Reversing cylinder device for performing the processing for the reverse side of the printing paper, the back nail device is in a use state during duplex printing that requires reversal of the printing paper, and the back nail device is not used during single-side printing that does not require reversal of the printing paper. A switching mechanism for detecting the use and non-use of the back claw device, and an operation detector for detecting a state of an operating piece interlocked with the switching mechanism, are provided in the reversing cylinder. It is installed inside the reversing cylinder and A transmitting unit that transmits a detection signal from the device, and a receiving unit that is provided outside the inverting cylinder and receives a signal transmitted from the transmitting unit, and outputs a detection signal from the operation detector to the outside of the inverting cylinder. It is characterized by being equipped with a non-contact sensor of the electromagnetic coupling type for outputting to a non-contact sensor.

According to a second aspect of the present invention, there is provided a reversing cylinder device for a duplex printing machine according to the first aspect of the invention, wherein the non-contact sensor is provided at an end of the reversing cylinder in an axial direction of the reversing cylinder. It is characterized by being arranged along. Claim 3
In the reversing cylinder device of the double-sided printing press according to the present invention, the non-contact sensor is disposed on an outer peripheral portion of the reversing cylinder in a radial direction of the reversing cylinder. It is characterized by:

[0029]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 illustrate a double-sided printing press according to an embodiment of the present invention.
FIG. 1 is a schematic diagram for explaining an outline of a motion detector and a non-contact sensor provided in a reversing cylinder device of a double-sided printing press of the present invention, and FIG. 2 is a double-sided printing press as one embodiment of the present invention. FIG. 3 is a schematic diagram illustrating an example of a method of transmitting a stopper detection signal according to the reversing cylinder device of FIG. 3. FIG. 3 is a diagram illustrating a stopper device provided in the reversing cylinder device of the double-sided printing press as one embodiment of the present invention. It is a schematic diagram.

The reversing cylinder device of the double-sided printing press according to the present embodiment includes an operation detector for detecting the operation of the back claw device in the reversing cylinder device of the double-sided printing press described as the related art, and a reversing detection signal. It is equipped with a non-contact sensor as a means for transmitting to the outside of the trunk device, and the other parts are configured in the same manner as the prior art. For this reason,
With reference to FIGS. 4 and 5 used in the description of the prior art, the entire configuration of the reversing cylinder device of the duplex printing machine of the present invention will be briefly described.

As shown in FIG. 4, the reversing cylinder device includes a reversing cylinder 1, a reversing cylinder 51, and an intermediate cylinder 25, and is provided between two printing units 100A and 100B. Each of the printing units 100A and 100B includes an impression cylinder 71, a blanket cylinder 81, and a plate cylinder 82 [FIG. 4A shows details of only the downstream printing unit 100B in FIG. ), The illustration of the blanket cylinder 81 and the plate cylinder 82 is omitted.) In a sheet-fed printing press or the like, the printing paper 4 is arranged in parallel in the traveling direction of the printing paper 4 for each ink color. The reversing cylinder device transfers the printing paper 4 from the upstream printing unit (only a part of the impression cylinder 71 is shown by a two-dot chain line) to the downstream printing unit 100B while reversing the front and back sides of the printing paper 4 during double-sided printing. Sometimes the upstream printing unit 1
00A to the printing unit 100B on the downstream side
It works so that it can be delivered without turning over.

The blanket cylinder 81, plate cylinder 82, reversing cylinder 1,
The intermediate cylinders 25 are all cylinders having the same diameter, and the impression cylinder 71 and the reversing double cylinder 51 have twice the diameter of the blanket cylinder 81, the plate cylinder 82, the reversing cylinder 1, and the intermediate cylinder 25. A plate (printing plate) 83 for printing is mounted on the outer peripheral surface of the plate cylinder 82, and the blanket cylinder 81 is
It is arranged so as to contact at 0A and transfer the print pattern to the blanket cylinder 81. The blanket cylinder 81 contacts the impression cylinder 71 at a tangent line 50B different from the tangent line 50A on the cylinder circumference. At this tangent line 50B, a predetermined amount of printing paper 4 is transferred from the upstream side along the outer peripheral surface of the impression cylinder 71. Is printed. The intermediate cylinder 25 is in contact with the impression cylinder 71 of the upstream printing unit 100A at another tangent line 50F on the circumference of the cylinder. The reversing cylinder 1 and the reversing double cylinder 51 of the reversing cylinder device are arranged so as to be in contact with each other at a tangent line 50C, and the reversing double cylinder 51 is in contact with the intermediate cylinder 25 at another tangential line 50D on the trunk circumference. The reversing cylinder 1 is connected to the downstream printing unit 1 at a tangent line 50 </ b> E on the opposite side of the reversing cylinder 51.
It is arranged so as to be in contact with the impression cylinder 71 of 00B.

All the cylinders mentioned above, ie the impression cylinder 7
1, blanket cylinder 81, plate cylinder 82, reversing cylinder 1, reversing double cylinder 51,
Each of the intermediate cylinders 25 is arranged so that the rotation axes are parallel to each other, and is supported by a frame of a printing press main body (not shown). For example, the adjacent cylinders are connected to each other via gears (not shown). Are connected to each other so that they rotate synchronously at the same peripheral speed.

On the outer periphery of the impression cylinder 71, the reversing cylinder 1, the reversing cylinder 51, and the intermediate cylinder 25, claw devices 78 for transferring the printing paper 4 conveyed from the upstream side to the downstream side, respectively. 110, 58, 68 are pivotally supported by respective claw shafts provided on the frame of each body. That is, on the outer periphery of the impression cylinder 71, a pair of holding claws 78a and pawl seats 78 are provided.
b are disposed at two positions equidistant from each other on the outer periphery of the impression cylinder 71 (only one claw device 78 is shown in FIG. 4). In these claw devices 78, the holding claws 78a and the claw seats 78b are provided with the impression cylinder 71.
The printing paper 4 can be gripped and released by a gripper 78a and a pawl seat 78b by a driving device (not shown) by a claw shaft 78c parallel to the rotation axis of the printing paper. These two claw shafts 78c are supported by the frame of the impression cylinder 71.

On the outer periphery of the reversing double body 51, a claw device 58 comprising a pair of holding claws 58a and a claw seat 58b is provided.
They are arranged at two places on the outer circumference of the reversing double cylinder 51 at equal intervals. In these claw devices 58, the claw 58a
And a claw seat 58b are provided with claw shafts 58 parallel to the rotation axis of the reversing double body 51.
The print paper 4 can be gripped or released by a gripper 58a and a pawl seat 58b by a driving device (not shown). These two claw shafts 58c are supported by a frame of the reversing double cylinder 51.

Further, a claw device 68 comprising a pair of holding claws 68a and a claw seat 68b is arranged on the outer periphery of the intermediate body 25. In the claw device 68, the claw 68a and the claw seat 68b are provided with a claw shaft 68c parallel to the rotation axis of the intermediate body 25.
The printing paper 4 can be gripped and released by the gripper 68a and the claw seat 68b by a driving device (not shown). This claw shaft 68
c is supported by the frame of the intermediate cylinder 25.

As shown in FIGS. 4 and 5, on the outer periphery of the reversing cylinder 1, a claw device 110 including a pair of a front claw device 2 and a back claw device 3 is disposed. The front nail device 2 includes a pair of grip nails 2a and a nail seat 2b, and the back nail device 3 includes a pair of grip nails 3a and a nail seat 3b. The front pawl device 2 is supported by a pawl shaft 21 parallel to the rotation axis of the reversing cylinder 1 so that the gripper 2a and the pawl seat 2b can grip and release the printing paper 4 by a driving device (not shown). Has become. Further, the back claw device 3 is supported by a claw shaft 22 parallel to the rotation axis of the reversing cylinder 1 so that the holding claw 3a and the claw seat 3b can grip and release the printing paper 4 by a driving device (not shown). It has become. These two claw shafts 21 and 22 are supported by the frame of the reversing cylinder 1.

The front claw device 2 and the back claw device 3 are in a posture in which both are outwardly directed as shown in FIG. 5 (a) (outward posture), and as shown in FIG. 5 (b). It is configured to be rotatable between an inward posture (inward posture). At this time, the front claw device 2 rotates around the claw shaft 21, and the back claw device 3 rotates around the claw shaft 22.

The back claw device 3 is used only during double-sided printing, and is configured so as to be stowed in an outward position during single-sided printing (non-use state). When the pawl device 78 (not shown) provided on the impression cylinder 71 of the upstream printing unit 100A comes to the position of the tangent line 50F, the intermediate cylinder 2
The fifth claw device 68 is also set to come to the position of this tangent line 50F. In addition, the claw device 68 of the intermediate body 25 is
When it comes to the position of 0D, the claw device 58 of the reversing double cylinder 51 is also set to come to the position of this tangent 50D. Further, when the pawl device 58 of the reversing double cylinder 51 comes to the position of the tangent 50C, the front pawl device 2 of the reversing cylinder 1 is also set to come to the position of the tangent 50C. When the front nail device 2 of the reversing cylinder 1 comes to the position of the tangent line 50E, the nail device 78 provided on the impression cylinder 71 of the downstream printing unit 100B is also set to come to the position of this tangent line 50E. . Further, when the end 4b of the printing paper 4 held by the claw device 58 of the reversing double cylinder 51 reaches the position of the tangent 50C, the back claw device 3 of the reversing cylinder 1 is also set to come to the position of the tangent 50C. Have been.

The claw shaft 21 for supporting the front claw device 2
A pivoting device (not shown) for rotating the front nail device 2 between the outward posture and the inward posture or maintaining the diplomatic posture is fixedly mounted at one end. This rotating device drives the claw shaft 21 to rotate according to the use or non-use state of the front claw device 2 by a mechanism such as a cam, for example. At one end of the claw shaft 22 that supports the back claw device 3, the back claw device 3 is rotated between an outward posture and an inward posture (use state), or is used in a diplomatic posture in a non-use state (storage state). ) Is fixedly provided.

By these rotating devices, during double-sided printing, the front nail device 2 and the rear nail device 3 rotate between the outward posture and the inward posture, respectively, and the front nail device 2 and the back nail device 3 The printing paper 4 can be exchanged between them.
Also, at the time of single-sided printing, the back claw device 3 is set in a non-use state by the rotation device, and the front claw device 2 is set to the outward posture by the rotation device. ) 51 and the printing paper 4 is transferred between a drum 71 (ie, an impression cylinder) on the downstream side.

In this embodiment, a stopper device 120 as shown in FIG. 3 is provided in the reversing cylinder 1 in order to surely set the use or non-use state of the back claw device 3.
The stopper device 120 mounted on the reversing cylinder 1 is used to fix the back claw device 3 in the retracted state (outward posture) during single-side printing so that the back claw device 3 is not used. Specifically, the stopper device 120 drives the air motor 9. When the shaft 10 is rotated clockwise as indicated by the arrow in FIG. 3A, the link mechanism 140, ie, the first
The second lever 13 is driven to rotate via the lever 11 and the link 14, and the stopper 5 is pushed out toward the front rotating plate 20 through the groove 13a and the pin 16.

As a result, the tip of the stopper 5 abuts on the contact surface 20a of the rotating plate 20 in the retracted position to restrict the rotation of the rotating plate 20, and the back claw device 3 integrated with the rotating plate 20 The function is such that the shaft 22 is fixed, and the back claw device 3 is fixed in the non-use state (retracted state) in the outward posture at one end of the movable range. Also, the air motor 9 is driven to
3B is rotated counterclockwise as indicated by the arrow in FIG. 3B, the power is transmitted to the link mechanism 140, that is, the first lever 11, the link 14, and the second lever 13, and the stopper 5 is moved from the rotary plate 20. I will be pulled back. As a result, the fixed state of the rotating plate 20 is released, and the shaft 22 of the back claw device 3 integrated with the rotating plate 20 can be freely rotated.

Note that all of the components of the stopper device 120 operate inside the outer peripheral surface of the reversing cylinder 1, so that the conveyance of the printing paper 4 is not hindered. In this device, the stopper device 120 converts the rotation of the shaft 10 into a linear motion of the stopper 5 via the link mechanism 140 to drive the stopper 5 forward and backward, so that the stopper 5 can easily fix the rotary plate 20 firmly. In particular, when fixed (see FIG. 3A), the link 14 faces in a direction substantially perpendicular to the rotation direction of the second lever 13, and the first lever 11 and the link 1
4 is substantially linear, it is difficult to rotate the second lever 13 by the link 14, and the link mechanism 1
40 has an advantage that the rotating plate 20 can be reliably held in a fixed state even when the force of the air motor 9 is weak or the force of the air motor 9 is removed. It should be noted that other types of motors (for example, electric motors) can be used instead of the air motor 9, but in this case, the same operation and effect as described above can be obtained.

Of course, members related to the stopper device 120, such as the stopper 5, the shaft 10, the first lever 11, the pin 12, the second lever 13, the link 14, and the bracket 15, do not protrude from the outer peripheral surface of the reversing cylinder 1. Is arranged to operate inside the outer peripheral surface of the reversing cylinder 1. Then, in order to detect a state in which the stopper device 120 configured as described above sets the back claw device 3 in a use state and a non-use state,
A motion detector 7 and a non-contact sensor 8 of an electromagnetic coupling type as shown in FIG. 1 are provided, and can be detected by the motion detector 7 and monitored outside the reversing drum device via the non-contact sensor 8. It has become.

The operation detector 7 includes limit switches 7a,
7b and cams 6a and 6b, and the cams 6a and 6b are fixed to one end of the shaft 10 of the stopper device 120. The rotation of the shaft 10 allows the cam 6a to operate the limit switch 7a, or the cam 6b to operate the limit switch 7b to be turned on. These limit switches 7a, 7b
Is transmitted to the transmission unit 8a provided inside the reversing cylinder 1 via the wiring 42A.
The transmission signal is transmitted from the transmission section 8a to the reception section 8b disposed outside the reversing cylinder 1 in a non-contact manner, and a detection signal is transmitted to the control device 19 outside the reversing cylinder apparatus via the wiring 42B. The use and non-use state of the back claw device 3 can be monitored by the control device 19.

The operation detector 7 will be further described. In the case of the present embodiment, the cam 6a and the limit switch 7a abut when the back claw device 3 is in use, and the cam 6b and the limit switch 7 when the back claw device 3 is not in use.
It is assumed that b is set in advance so as to abut. When the shaft 10 is rotated by the air motor 9 and the claw shaft 22 of the back claw device 3 is used, the cam 6 fixed to the shaft 10 is used.
a and 6b also rotate synchronously, the concave portion 6c on the outer periphery of the cam 6a engages with the engagement protrusion 7c of the limit switch 7a, and the limit switch 7a is turned on. This ON signal is transmitted to the transmitting section 8a of the non-contact sensor 8 via the wiring 42A, and the control device 19 can monitor that the back claw device 3 is in use via the wiring 42B.

When the shaft 10 is rotated by the air motor 9 and the claw shaft 22 of the back claw device 3 is not used, the cams 6a and 6b fixed to the shaft 10 also rotate synchronously with the shaft 10, and The recess 6c on the outer periphery of 6b is the limit switch 7b
And the limit switch 7b is
The state becomes the N state. This ON signal is transmitted to the transmission unit 8a of the non-contact sensor 8 via the wiring 42A, and the control device 19 can monitor that the back claw device 3 is in an unused state via the wiring 42B. .

In this embodiment, the non-contact sensor 8 is arranged on the axis of the reversing cylinder 1 as shown in FIG. That is, the transmitting unit 8a is fixed to the end of the reversing cylinder rotating shaft 1b on the axis of the reversing cylinder 1 via the bracket 17, and the receiving unit 8b is connected to the reversing cylinder rotating shaft slightly separated from the transmitting unit 8a. 1b, it is disposed so as to face the transmitting unit 8a. The receiving portion 8b is fixed to the frame 35 of the reversing drum device via the brackets 18 and 23.

With such a configuration, the non-contact sensor 8 of the present embodiment can always detect a signal while the reversing cylinder 1 is rotating. Generally, the non-contact sensor 8 can be connected to a plurality of detection switches, and
It has a function of transmitting and receiving detected signals without contact. Various types of the non-contact sensor 8 are manufactured and sold. For example, there is a product such as Nippon Burough.

In the case of the non-contact sensor 8, the conventional detecting device 3
0 and proximity switch 31 and proximity pieces 29a and 29b
Compared with the alignment with the a and 31b, there is a characteristic in which accurate stop accuracy of the reversing cylinder 1 is not required.

The reversing cylinder device of the double-sided printing press as one embodiment of the present invention is configured as described above.
It works as follows. As shown in FIG. 4, the printing paper 4 sent one by one from a paper feeding device (not shown) is the printing paper 4 sent one by one from a feeding device (not shown).
Is printed by the impression cylinder 71 of the printing unit 100A on the upstream side, and thereafter, a pawl device (not shown) 78 on the outer periphery of the impression cylinder 71 holds the tangent 50F between the impression cylinder 71 and the intermediate cylinder 25. The leading end 4a of the paper 4 is moved to the claw device 6 of the intermediate cylinder 25.
8 grips. In conjunction with this, the pawl device 78 of the impression cylinder 71 releases the leading end 4 a of the printing paper 4, and the printing paper 4 is transported while the leading end 4 a is gripped by the pawl device 68 and wrapped around the circumference of the intermediate drum 25. Is done. By this transfer, the front and back of the printing paper 4 are reversed. At the tangent line 50D to the reversing double cylinder 51, the claw device 58 of the reversing double cylinder 51 grips the leading end 4a of the printing paper 4 gripped by the claw device 68 on the outer periphery of the intermediate cylinder 25. In conjunction with this, the pawl device 78 of the intermediate cylinder 25 releases the leading end 4a of the printing paper 4, and the printing paper 4 is moved to the leading end 4a.
Is gripped by the claw device 58 and transported while being wound around the periphery of the reversing double cylinder 51. The delivery to the reversing double cylinder 51 turns the printing paper 4 upside down.

Here, when printing the printing paper 4 on both sides, the stopper device 120 releases the claw shaft 22, the back claw device 3 rotates between the outward position and the inward position, and the front claw device. The printing paper 4 is transferred from the back claw device 3 to the front claw device 2 while the second paper 2 rotates between the outward posture and the inward posture in conjunction with the back claw device 3. Then, at the tangent line 50C, as shown in FIG. 4A, the back claw device 3 of the reversing cylinder 1 grips the end 4b of the printing paper 4, and in conjunction with this, the reversing double cylinder 51
Release the leading end 4a of the printing paper 4 and the printing paper 4 is transferred from the reversing double cylinder 51 to the reversing cylinder 1.

Thereafter, the front nail device 2 and the rear nail device 3 holding the end 4b of the printing paper 4 change from the outward posture shown in FIG. 5A to the inward posture shown in FIG. 5B. Then, the front nail device 2 grips the end portion 4b of the printing paper 4 and the back nail device 3 releases the end portion 4b of the printing paper 4 and transfers the printing paper 4 from the back nail device 3 to the front nail device 2. . After that, the front nail device 2 holding the end 4b of the printing paper 4 and the back nail device 3 releasing the end 4b of the printing paper 4 return to the outward posture again. By this operation, the printing paper 4 is turned upside down. That is, the end 4b of the printing paper 4 gripped by the back claw device 3 is gripped by the front claw device 2 as the leading end 4a in the traveling direction, and is conveyed while being wound around the reversing cylinder 1. At this time, the front and back of the printing paper 4 are not reversed.

When the printing paper 4 is to be printed on one side, the leading edge 4a of the printing paper 4 gripped by the claw device 58 of the reversing double cylinder 51 at the tangent line 50C is gripped by the front nail device 2, and interlocked with this. The pawl device 58 is connected to the leading end 4 of the printing paper 4.
a is released, and the printing paper 4 is transferred from the reversing double cylinder 51 to the reversing cylinder 1. At this time, the front and back of the printing paper 4 are reversed.
Thereafter, in both double-sided printing and single-sided printing, when the leading end portion 4a of the printing paper 4 gripped by the front nail device 2 of the reversing cylinder 1 reaches a tangent 50E to the impression cylinder 71, the claw device 78 of the impression cylinder 71 causes the printing paper 4 to move. , The front nail device 2 releases the leading end 4a of the printing paper 4 in conjunction with the leading end 4a, and the printing paper 4 is transferred from the reversing cylinder 1 to the impression cylinder 71. At this time, the front and back of the printing paper 4 are reversed. Therefore, when printing on both sides,
Due to the three inversions at the tangent lines 50F, 50D, and 50E, when the wrapping around the impression cylinder 71 of the downstream printing unit 100B occurs, the impression cylinder 71 of the upstream printing unit 100A is wound.
When the single-sided printing is performed, the impression cylinder 7 of the downstream printing unit 100B on the downstream side is rotated by four reversals at the tangent lines 50F, 50D, 50C, and 50E.
1, the upstream printing unit 100A
Front and back are the same as when they are wound around the impression cylinder 71.

Thus, the printing paper 4 conveyed while being wound on the surface of the impression cylinder 71 is subjected to predetermined printing from the blanket cylinder 81 at the tangent line 50B, and is sent to the next printing unit. In this manner, multi-color double-sided printing or multi-color single-sided printing is performed on the printing paper 4 via the plurality of printing units. In this manner, printing on the printing paper 4 is performed on both sides or one side. At this time, the operation detector 7 and the non-contact sensor 8 provided in the reversing cylinder device operate as follows.

When printing the printing paper 4 on both sides, the shaft 10 is rotated counterclockwise in FIG. 3B by the air motor 9 to retract the stopper 5 with respect to the contact surface 20a.
The rotating plate 20 fixed to the claw shaft 22 of the back claw device 3 is released so as to be rotatable, and the claw shaft 22 is used, and the back claw device 3 is moved between the outward position and the inward position by a drive mechanism (not shown). Can rotate. Thus, the cams 6a and 6b (see FIG. 1) fixed to the shaft 10 also rotate synchronously with the shaft 10, and the recess 6c on the outer periphery of the cam 6a engages with the engaging projection 7c of the limit switch 7a, The limit switch 7a is turned on. This ON signal is transmitted to the transmission section 8a of the non-contact sensor 8 via the wiring 42A, and the controller 19 can monitor that the back claw device 3 is in use via the wiring 42B.

When printing the printing paper 4 on one side, the shaft 10 is rotated counterclockwise in FIG. 3A by the air motor 9 to advance the stopper 5 with respect to the contact surface 20a. 5 fixes the rotating plate 20 fixed to the claw shaft 22 of the back claw device 3, and the claw shaft 22 of the back claw device 3 is in an unused state (retracted state). As a result, the cams 6a and 6b fixed to the shaft 10 also rotate synchronously with the shaft 10, so that the recess 6c on the outer periphery of the cam 6b is engaged with the engagement protrusion 7c of the limit switch 7b.
And the limit switch 7b is turned ON.
This ON signal is transmitted to the transmission section 8a of the non-contact sensor 8 via the wiring 42A, and is transmitted to the control device 19 via the wiring 42B.
Can monitor that the back claw device 3 is in an unused state.

Further, the cams 6a, 6b and the engagement projections 7c which move according to the use or non-use of the back claw device 3 are sufficiently arranged inside the reversing drum outer peripheral surface 1a and the end portion.
The non-contact sensor 8 disposed on the surface (the end of the reversing cylinder 1 or the like) merely transmits a signal and does not displace as in the case of the above-described detection device 30. Does not interfere with the operation of the reversing cylinder 1 by protruding from the outer surface of the reversing cylinder 1 and interfering with other cylinders. The non-contact sensor 8 includes a pair of transmitting / receiving units 8.
What is necessary is just to arrange | position so that only a and 8b may oppose, and it can arrange | position easily. The non-contact sensor 8 of the present embodiment has the configuration shown in FIG.
As shown in (a), since it is arranged on the axis of the reversing cylinder 1, the transmission and reception of the detection data by the non-contact sensor 8 can always be performed irrespective of the rotation phase of the reversing cylinder 1. Thus, in the present reversing drum device, the motion detector 7
The use and non-use state of the back nail device 3 can be constantly monitored through the contactless sensor 8 and the non-contact sensor 8.

By the way, the non-contact sensor 8 is not limited to the position on the axis of the reversing cylinder 1 but may be arranged at another end of the reversing cylinder 1 along the axis of the reversing cylinder 1. The non-contact sensor 8 may be arranged as shown in FIG. In other words, as shown in FIG. 2B, a non-contact sensor 8 of an electromagnetic coupling type for externally detecting the use state and the non-use state of the back claw device 3 is provided in the radial direction of the reversing cylinder 1. . This non-contact sensor 8 is similar to the above embodiment,
In this example, the transmitting section 8a is fixed to the inside of the outer circumference of the reversing cylinder 1 via the bracket 24 inside the outer circumference 1a of the reversing cylinder.
The receiving portion 8b is fixed to the frame 35 of the reversing cylinder device via the bracket 25 outside the reversing cylinder outer peripheral surface 1a. The non-contact sensor 8 includes a transmitting surface 8c and a receiving surface 8d.
Are disposed so as to face each other in a non-contact manner with respect to the outer circumferential surface 1a of the reversing cylinder.

In the case of the non-contact sensor 8 arranged as described above or the non-contact sensor 8 arranged at an end shifted from the axis of the reversing cylinder 1, the non-contact sensor 8 is periodically adjusted in accordance with the rotation cycle of the reversing cylinder 1. Has the advantage that a signal can be detected. It should be noted that the present invention is not limited to the above-described embodiment, and can be implemented with various modifications of the embodiment without departing from the spirit of the present invention. For example, in the above-described embodiment, the cams 6a and 6b of the motion detector 7 are mounted on the shaft 10 that drives the stopper device 120. However, the present invention is not limited to this.
May be directly fixed to the shaft 22 of the back claw device 3, or if the shaft interlocked with the shaft 22 is other than the shaft 10, the motion detector 7 may be fixed to the shaft.

Further, instead of the motion detector 7, the above-described detecting device 30 (see FIG. 6) is provided in the reversing cylinder 1,
A configuration in which the detected signal is transmitted to the outside of the reversing drum device by the non-contact sensor 8 is also conceivable. Further, the transmitting unit 8a and the receiving unit 8b of the non-contact sensor 8 of the present invention
Is not limited to the transmission and reception of the detection signal of the use and non-use state of the back claw device 3, but also the use of the detection signal of the use and non-use state of the back claw device 3 and transmission of other signals and power. Can also be used together.

The transmitting section 8a of the non-contact sensor 8 may have a receiving function in addition to the transmitting function.
May have a transmission function in addition to the reception function. Further, in the reversing cylinder device, contrary to the above, when the limit switch 7a is operated (turned on) by the cam 6a, the back claw device 3 is set to the non-use state, and the limit switch 7b is operated by the cam 6b ( It may be configured such that when it is turned on), the back claw device 3 is used.

[0064]

As described above in detail, according to the reversing cylinder device of the double-sided printing press according to the present invention, the back nail device is used in the double-side printing when the printing paper needs to be reversed. A switching mechanism for disabling the back claw device during single-sided printing that does not require reversing the paper, and an operation detection for detecting the state of an operating piece that is interlocked with the switching mechanism to detect use / non-use of the back claw device. And a transmitting unit installed inside the reversing cylinder and transmitting a detection signal from the operation detector, and a signal installed outside the reversing cylinder and receiving a signal transmitted from the transmitting unit. It is equipped with an electromagnetic coupling type non-contact sensor that outputs a detection signal from the motion detector to the outside of the reversing cylinder, and a motion detector that detects the use or non-use of the back claw device. The detected signal to the outside of the reversing cylinder Since the structure is separated into a non-contact sensor can be simplified to, also reduced the failure hardly disturbed the operation of the convertible cylinder device. In addition, by using the non-contact sensor, it is possible to transmit and receive various signals, electric power, and the like, in addition to transmitting a signal indicating whether the back nail device is in use or not.

According to the second aspect of the present invention, the non-contact sensor is disposed at the end of the reversing cylinder along the axis of the reversing cylinder. Thus, even when the reversing cylinder is in the rotating state, it is possible to always check the use or non-use state of the back claw device outside the reversing cylinder device. Further, according to the reversing cylinder device of the double-sided printing press according to the present invention, since the non-contact sensor is disposed on the outer peripheral portion of the reversing cylinder along the radial direction of the reversing cylinder, reception is achieved. Since the unit and the transmitting unit are installed so as to face each other in a non-contact manner, it is easy to detect the use and non-use of the back nail device. Further, the signal can be periodically detected in accordance with the rotation cycle of the reversing cylinder.

[Brief description of the drawings]

FIG. 1 is a schematic diagram for explaining an outline of an operation detector and a non-contact sensor provided in a reversing cylinder device of a double-sided printing press as one embodiment of the present invention, and FIG. FIG. 1B is a cross-sectional view, and FIG.
(A) is a view as viewed from the direction of arrow A.

FIGS. 2A and 2B are schematic diagrams illustrating an example of a method of transmitting a stopper detection signal according to the reversing cylinder device of the double-sided printing press as one embodiment of the present invention. FIG.
(B) shows the second example.

FIG. 3 is a schematic diagram for explaining a stopper device provided in a reversing cylinder device of a double-sided printing press as one embodiment of the present invention, and FIG.
(B) shows a state when the stopper is released.

4A and 4B are schematic diagrams showing a reversing cylinder device of a conventional double-sided printing press, wherein FIG. 4A illustrates a state during double-sided printing, and FIG. 4B illustrates a state during single-sided printing.

5A and 5B are views for explaining a claw device of a reversing cylinder device of a conventional double-sided printing press, wherein FIG. 5A shows an outward posture, and FIG. 5B shows an inward posture.

6A and 6B are schematic diagrams illustrating an example of a stopper detection device according to the reversing cylinder device of the duplex printing press considered in the process of devising the present invention. FIG.
(B) shows a state when the stopper is released.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Reversing cylinder 1a Reversing cylinder outer peripheral surface 1b Reversing cylinder rotation axis (axial line) 2 Front nail device 2a, 3a, 58a, 78a Holding nail 2b, 3b, 58b, 78b Nail seat 3 Back nail device 4 Printing paper 4a Tip 4b End portion 5 Stopper 6a, 6b Cam (operating piece) 6c Recess 7 Motion detector 7a, 7b Limit switch 7c Engagement protrusion 8 Non-contact sensor 8a Transmitting unit 8b Receiving unit 8c Transmitting surface 8d Receiving surface 9 Air motor 10, 10a Shaft 11 First lever 11a Key 12, 14a, 14b, 16, 36c Pin 13 Second lever 13a Groove 14 Link 15, 17, 18, 23, 30 Bracket 15a Guide hole 19 Controller 20 Rotating plate 20a Contact surface 21, 22, 58c, 78c Claw shaft 29a, 29b Proximity piece 30 Detector 31a, 31b Proximity switch 32, 33 Frame 35, 36, 37 Sector gear 36a, 37a Support column 36b Gear portion 38a, 38b Cam follower 39a, 39b, 40a, 40b Cam 41a Spring 42, 42A, 42B Wiring 50A, 50B, 50C, 50D, 50E, 50F Tangling line 51 Reversing double cylinder 58, 78, 110 Claw device 71 Impression cylinder 81 Blanket cylinder 82 Plate cylinder 83 Plate 100A, 100B Printing unit 120 Stopper device (switching mechanism) 130 Drive mechanism 140 Link mechanism

Claims (3)

[Claims] 1. A reversing cylinder mounted on a duplex printing machine,
A claw device comprising a front claw device and a back claw device mounted on the outer periphery of the reversing cylinder in pairs with each other, and when printing on both sides, the printing paper is transferred to each other by the front claw device and the back claw device. A reversing cylinder device for performing a process for reversing the front and back of the printing paper, wherein the back claw device is used during double-sided printing that requires reversing the printing paper, and when performing single-sided printing that does not require reversing the printing paper. A switching mechanism for disabling the back claw device, and an operation detector for detecting a state of an operating piece interlocked with the switching mechanism to detect use / non-use of the back claw device;
A transmitting unit that is provided inside the reversing cylinder and is installed inside the reversing cylinder and transmits a detection signal from the operation detector, and a signal that is installed outside the reversing cylinder and transmitted from the transmitting unit. With a receiving unit to receive,
A reversing cylinder device for a double-sided printing press, comprising an electromagnetic coupling type non-contact sensor for outputting a detection signal from the operation detector to the outside of the reversing cylinder. 2. The non-contact sensor is provided at an end of the reversing cylinder.
The reversing cylinder device of a double-sided printing press according to claim 1, wherein the reversing cylinder is disposed along the axis of the reversing cylinder. 3. The reversing cylinder of a double-sided printing press according to claim 1, wherein the non-contact sensor is disposed on an outer peripheral portion of the reversing cylinder along a radial direction of the reversing cylinder. apparatus.