JPS58219057A - Sheet-fed rotary press with turning-over mechanism - Google Patents

Abstract

PURPOSE:To improve the durability of a sheet-fed rotary press with turning-over mechanism and reduce its maintenance work by such an arrangement wherein the pressure of a spring is caused to act on a turning-over cam only when turning-over claws are kept closed and a claw shaft is directly rotated by the cam follower of a turning-over claw open-close mechanism. CONSTITUTION:At the time of both-side printing, when the end of a sheet of paper comes to a position opposing to the reversing claw device 24 of a turning- over cylinder 5 and an attracting lever 49, the sheet is rotated by being attracted by them, and by the rotation of a claw shaft 19, a cam lever rotates, and simultaneously when a cam follower comes to a position opposing to a reversing gripper cam, a reversing cam 70 disappears and reversing claws 25 grip the end of paper as they open and close, and they move around together with the turning-over cylinder 5 and turn the sheet of paper over. The pressure of a compression coil spring acts on the reversing cam 70 only when the reversing claws are kept closed and the cam follower 71 of the open-close cam mechanism of the reversing claws 25 directly rotates the claw shaft 19, therefore undue force is not applied to any cam follower and cam, and moment load is small. As a result of this arrangement, the durability of the mechanism is considerably improved.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sheet-fed rotary printing press with a reversing mechanism that can be used for single-sided printing and double-sided printing.

BACKGROUND ART With the diversification of printing, various types of sheet-fed rotary printing presses with reversing mechanisms that can be used for single-sided printing and double-sided printing have been proposed and put into practical use. In all of these types of printing machines, printing is carried out on one side of the paper held in the claw of the printing cylinder, and the paper is wrapped around the circumference of the cylinder. Double-sided printing is performed by holding the paper in its mouth and inverting it, then passing it to the next printing cylinder and printing on the back side. In the case of single-sided printing, the reversing operation of the paper by the reversing claw is stopped, and the It is then passed to the next printing cylinder and printed on the same side.

ゝ・ During double-sided printing, the reversing claw grips the tail of the paper and rotates 180 degrees on its axis while revolving 180 degrees on its axis with the reversing cylinder, then releases the paper and revolves the remaining 180 degrees while rotating 180 degrees in the opposite direction. The 180° reversal of the reversing claw is conventionally performed by a cam mechanism. However, when reversing with a cam mechanism, the cam follower is pressed against the cam surface by a spring means, so when attempting to reverse 180 degrees, the spring stroke increases and when the cam follower reaches the highest part of the cam, accumulation occurs in the spring. The resulting spring force becomes extremely large and acts on the cam follower and cam. In addition, the opening and closing of the reversing claw is also performed by a cam mechanism, and the cam follower is also pressed against the cam surface by a spring means, so it can be opened and closed to pick up paper and release the paper before and after reversing 180 degrees. Mechanically, a large load acts on the cam follower and cam. Therefore, the reversing and opening/closing cams and cam followers are prone to wear, and troublesome maintenance work must be repeated to maintain paper gripping accuracy. In addition, because the cam stroke for 180° reversal becomes large, it is not possible to accurately control the tip due to the accuracy of the cam, and the paper gripping position by the reversing pawl, that is, the printing registration between the front and back sides of the paper is misaligned. This has the disadvantage that the quality of printed matter deteriorates.

The present invention is based on the following points, and includes a reversing cam and a cam follower that is pressed against the cam surface by a spring means, and the reversing pawl on the pawl shaft is rotated through the rotation of the pawl shaft. A paper gripping cam, a reversing gripping cam, which has a reversing cam mechanism that rotates while the reversing cylinder rotates, a cam follower pivotally mounted to a cam lever fixed to a pawl shaft, and a cam surface that presses the cam follower into contact with a spring means. A sheet-fed rotary printing machine with a reversing mechanism that prevents wear between each cam and cam follower and improves paper gripping accuracy by providing a paper release cam and a paper gripping and releasing cam mechanism that opens and closes a reversing claw. This is what we provide. Embodiments of the present invention will be described in detail below with reference to the drawings.

1 to 7 show an embodiment of a sheet-fed rotary printing press with a reversing mechanism according to the present invention, in which FIG. 1 is a cylinder arrangement diagram thereof, FIG. 2 is a side view of the reversing cylinder on the driving side, and FIG. 4 is an enlarged sectional view of the outer periphery of the reversing cylinder, and FIG. 5 is a partially cutaway view showing the outer periphery of the driving side shaft end of the reversing cylinder developed.
FIG. 6 is a partially cutaway view showing the outer periphery of the operating side shaft end of the reversing cylinder developed, and FIG. 7 is the outer periphery of the reversing cylinder corresponding to FIG. FIG.

In the figure, a first printing unit and a second printing unit of a printing press each include a plate cylinder 1 on which a printing plate is mounted, and an inking device and a water supply device (not shown) that supply ink and water to the plate surface. Below the printing cylinder 1, there is a rubber cylinder 2 having the same diameter and onto which the image on the printing plate is transferred.
They are arranged with their peripheral surfaces facing each other. Furthermore, each rubber cylinder 2
An impression cylinder 3 and an impression cylinder 4, each having a diameter twice that of the rubber cylinder, are arranged below the rubber cylinders 2 with their peripheral surfaces facing each other, and between the impression cylinders 3 and 4, A reversing cylinder 5 having the same diameter as this is provided with its curved surfaces facing each other. Reference numeral 6 denotes a swinging device that swings using a cam mechanism, and is equipped with a swinging claw that opens and closes using the cam mechanism. It is constructed so as to supply the liquid to the first impression cylinder 3. On the outer periphery of each double-diameter impression cylinder 3, 4 that rotates in the direction shown by arrow A in the figure, there is a swing device #6 that opens and closes with a cam mechanism, a swing pawl of #6, and a reversing pawl device 24 (described later) on the reversing cylinder 5. ) A plurality of sets of gripping claw devices (hereinafter referred to as "claws") 9 consisting of claws and claw bases that change the grip of the paper q and wrap it around the circumferential surface of the trunk by rotation of the barrel are located at positions that divide the circumference into two equal parts. The claw shafts 10 are arranged in parallel at a predetermined interval on a pair of claw shafts 10 that are mounted on a shaft. The reference numeral 11 in FIG. 2 is an opening/closing cam that is fixed to the machine frame side and opens and closes the pawl 9. On the cam surface thereof, there is a cam that is fixed to the end of the pawl shaft 10 with split clamping. A cam follower 13 at the free end of the cam lever 12 is in contact with it.

Next, the configuration of the reversing cylinder 5 will be explained. The reversing cylinder 5 is rotatably supported by left and right frames 14 and 15 via Taber roller bearings 16 and rotates in the direction shown by arrow B in the figure, and two sets of paper holding non-reversing devices are installed on the outer periphery of the reversing cylinder 5. are placed facing each other. These two sets have exactly the same configuration, so one of them
Only groups will be explained. That is, the inversion trunk 5 is lightweight and integrally formed by a shaft core part, an outer peripheral part, and a plurality of skeletons connecting these parts, and disk-shaped pillows 17 and 18 are integrally provided at both ends. ing.

In the left and right pillows 17 and 18, a claw piece opening 9 is regulated from moving in the axial direction by a collar 20 and is pivotally supported at both ends via a needle bearing 21. is pivotally supported by a pawl bearing 23 fixed to the bottom of the trunk circumferential notch 22. The one designated as a whole by the reference numeral 24 has a pawl shaft 19 which is out of phase with the pawl 9 on the impression cylinders 3 and 4 in the axial direction.
FIG. 8 (
The reversing claw 25 shown in a) and the claw base accessory 2 shown in FIG. 8(b)
It consists of 6. This reversing pawl 25 is rotatably attached to a pawl holder 29 which is secured to the pawl shaft 19 together with a spring receiver 2T by a bolt 28, and an eccentric portion of this pawl holder 29 with a pivot 30. An adjustment screw 32 whose stepped portion abuts the upper surface of the pawl holder 29 is screwed into the pawl 31 via an L-shaped locking washer 33. Also, between the claw holder 29,
A claw spring 34 is attached to the claw 31 to apply a rotational force in the counterclockwise direction shown in FIG. 8(a). Also nail stand accessory 26
It is formed of a nail rest holder 35 which is formed in a more rigid shape and includes a reversing claw 25, and a nail rest 37 which is mounted with a bolt 36 at the tip of the claw rest 37 facing the claw 31. A pawl spring 38 is interposed between the other free end of the pawl base accessory 26 and the spring receiver 27 of the reversing pawl 25, which springs in the direction of closing the pawl 31 and the pawl base 3T. .

In addition, it is provided on the body circumference near the tip of the reversing claw device 24.
A stopper stand 40 extending over the entire length of the body is fixed to this notch 39 with a bolt 41.
At No. 0, a stopper 42 which abuts the bolt 36 of the claw base accessory 26 to restrict the rotation of the reversing claw device 240 is screwed in with screws 43 and 44 that correspond to each of the reversing claw devices 24 to prevent loosening. has been done. The reversing claw device ``24'' is configured so that the entire υ is integrally excited by a reversing drive device to be described later, ``250 times'' between the position shown in FIG. 4 and the position shown in FIG. has been done.

On the other hand, in the notch 22 of the reversing cylinder 5, a suction lever shaft 45 formed in the shape of a hollow tube is rotatably supported by the left and right pillows 17 and 18 via a needle bearing 46. Bearing 41 with multiple notches 22 in its center
The collar 48 restricts movement in the axial direction. Reference numeral 49 designates a plurality of suction levers arranged in parallel on the suction lever shaft 45 in correspondence with the respective reversing claw devices 24, and are L-shaped in both side and plan views. , is fixed to the suction lever shaft 45 with bolts 50.

A suction head 52 is attached to one free end of the suction lever 49, and the suction head 52 has a suction hole on its end surface that communicates with the inside of the suction lever shaft 45 through a communication hole 51. A valve pin 53 for opening and closing the communication hole 51 is provided and is softly braked with a synthetic resin bolt 54. Further, on the other free end of the suction lever 52, a stopper 55, which is integrated with a spring receiver, a bolt, and a nut, and which restricts the rotation of the small pawl block 26, is attached in the protruding direction by a compression coil spring 56. It is mounted so that it can slide freely. Furthermore, the inner wall-shaped stratified lever shaft 45 has one end closed and the other end protruding from the pillow 11 to the frame 14 side, and this protrusion is rotatably fitted into the annularly formed rotary pulp 5T. Therefore, an arc-shaped hollow portion formed in a part of the rotary valve 5T and the inside of the suction lever shaft 45 are communicated with each other. On the other hand, on the side of the frame 14, a valve 58 formed in an annular shape so as to be rotated so that the inner peripheral surface of the rotary pulp 5T is in sliding contact with the outer peripheral surface is fixed by bolts 59, and one of the valves 58 is fixed to the frame 14 side. An intake port 60 that communicates with the inside of the machine when facing the machine is installed, and a flexible tube 61 connected to an intake device attached to the machine is fitted into the intake port 60. Although not shown in the drawings, there is a rubber air tube formed in an arc shape on the outer periphery of the reversing cylinder 5 and connected to the air supply device attached to the machine base through a flexible tube. Suction lever 4
It is attached to the upstream side in the rotational direction of the reversing cylinder 5 with respect to the reversing cylinder 5, and is configured to press the paper 8 against the circumferential surface of the first impression cylinder 3 during the desired timing before suction by the suction lever 49.

Next, a driving device for reversing and opening/closing the reversing claw device 240 and rotating the suction lever 49 will be described. On the downstream side in the rotational direction of the reversing cylinder 5 with respect to the pawl shaft 19, a reversing drive shaft 62 formed in a hollow tubular shape is rotatably mounted on a thick part of the pillow 17° 18 via a bush 63 and a needle bearing 64. The collar 65 and the segment gear 6 described later are
6 restricts movement in the axial direction. The segment gear 66 is fixed to the protruding portion of the reversing drive shaft 62 from the pillow 17 with bolts 6T, and the segment teeth at its free end mesh with the binions 68 fixed to the protruding portion of the pawl shaft 19. ing. A cam follower 71 that opposes a reversing cam 70 fixed to the frame 14 side is fitted into a pin 69 that is slidably supported in the center of the segment gear 66. Move 69 and Pol)7
3, the cam follower 71 is configured to move as shown by solid lines and chain lines in FIG. ing. By doing this, when the reversing cylinder 5 rotates, the segment gear 66 swings due to the action of the cam surface of the reversing cam TO and the cam follower 71, and the reversing claw device 24 rotates at a angle of 250° as described above with the predetermined tie roasting. Rotate and flip.

The reference numeral 74 in FIG. 5 is a scale plate that indicates the position of the cam follower T1. Further, on the reversing drive shaft 62, a pair of left and right spring levers 75 are fastened and fixed close to the inside of the pillow 17.18, and one end of the spring lever T6 is pivoted to the free end of the spring lever T5. extends through the vicinity of the trunk core to the opposite trunk periphery, and is slidably supported by a bearing at the other end. On this spring shaft 76 is a compression coil spring 7 that applies a rotational force to the segment gear 66 in the direction of pressing the cam follower T1 against the cam surface of the reversing cam TO.
7 is installed. Reference numeral 78 denotes a stopper fixed to the outer periphery of the pillow 17, which includes a pin 81 with a compression coil spring 80 slidably supported on the support plate γ9, and an oval-shaped cam 82 attached to the tip of the pin 81. By rotating the pin 81 by 90 degrees while pressing against the elastic force of the compression coil spring 80 to change the engagement position of the notch 83, the large diameter portion of the cam 820 can be connected to the segment gear. 6C free end bolt 84
When pressed, the cam follower 71 is slightly separated from the cam surface of the reversing cam 70 to facilitate the axial movement of the cam follower 71 described above.

Next, a cam follower 86 is pivotally attached to a cam lever 85 which is fixed to the protruding portion of the claw shaft 19 from the pillow 18, and a cam follower 86 is fixed to the frame 15 with a phase shift in the circumferential direction. The cam 87A1 is configured to come into contact with either the release cam 87B or the reverse gripping cam 88 at a predetermined timing.

In other words, the gripping cam 87A is a cam that opens and closes the reversing claw 25 in order to grip the paper 8 from the first impression cylinder 3 when the reversing claw device 24 is not reversed and is in the state shown in FIG. The reversing grip cam 88 is a cam that opens and closes the reversing pawl 25 in order to change the grip of the paper 8 from the first impression cylinder 3 when the reversing claw device #t24 is reversed and in the state shown in FIG. Also release cam 87B
The reversing claw 2 is used to transfer the paper 8 to the second impression cylinder 4.
This is a cam that opens and closes 5. Further, the reversing drive shaft 62
A torsion bar 90 with a hexagonal head at one end inserted into a hexagonal hole 89 at the shaft end is passed through the inside of the torsion bar 90, and the hexagonal head at the other end of this torsion bar 90 is inserted into the pillow on the opposite side. 18 with bolts 91 so as to be rotatably adjustable.A bearing plate 9206 is fitted and fixed into a square hole 93. Reference numeral 94 is a pin for adjusting the scale for indicating the rotational position of the bearing plate 92. The torsion bar 90 is mounted on a bearing so that even if the cam follower 71.86 comes off any of the cams 70.87A, 87B, and 88 and the rotation of the pawl shaft 19 is no longer restricted, elastic force will still be accumulated. The screw is adjusted by a plate 92, and the reversing claw 25 is biased in the closing direction via the segment gear 66 and pinion 68.

Next, on the upstream side in the rotational direction of the reversing cylinder 5 with respect to the suction lever shaft 45, a suction drive shaft 94 formed in a hollow tube shape is connected to the thick part of the pillow 17.18 via a bush 95 and a needle bearing 96. It is rotatably supported by a shaft, and its movement in the axial direction is restricted by a collar 91 and a segment gear 98, which will be described later. The segment gear 98 is fixed to the protrusion of the suction drive shaft 94 from the pillow 18 with bolts 99, and the segment teeth at its free end are fixed to the protrusion of the suction lever shaft 45 and mesh with the binion 100. ing. The other free end of the segment gear 98 is fitted with a cam follower 102 that faces the suction lever rotation cam 1 fixed to the frame 15 side. 101 and cam follower 102
The segment gear 98 rotates due to the action of the suction lever 4.
9 is configured to rotate from the state shown in FIG. 4 to the state shown in FIG. 7 at a predetermined timing. Furthermore, inside the suction lever shaft 45, there is a hexagonal head at one end.
A torsion bar 103 inserted into the square hole is passed through, and the square head of the other end of this torsion bar 103 is fixed to the pillow 17 on the opposite side with a bearing plate 10506 square hole, which is rotatably fixed to the pillow 17 on the opposite side. 106 and fixed thereto.

Reference numeral 107 is a pin for adjusting the scale for indicating the rotational position of the bearing plate 105. The torsion bar 103 applies a rotational force to the segment gear 98 in the direction of bringing it into pressure contact with the cam surface of the cam follower 102t-adsorption lever rotation cam. Furthermore, the segment gear 98 has a cam follower 102 attached to the suction lever rotation cam 101. A stopper 10B that restricts the rotation of the segment gear 98 in the counterclockwise direction in FIG. The stopper 10B has the same configuration as the stopper 78, so each part is given the same reference numeral and the explanation thereof will be omitted. However, the lift of the cam 82 is much larger than that of the stopper T8, and the cam follower 10
2 is configured to move a large amount.

The single-sided printing operation of the sheet-fed rotary printing press with a reversing mechanism configured as described above will be explained based on the above-mentioned figures and the operation explanatory diagram of FIG. 9. When switching from double-sided printing to single-sided printing, first:
The cam 82 of the stopper 108 is moved to the third position where the cam follower 102 is in contact with the high part of the suction lever (b) movable cam 101.
It is rotated as shown by the chain line in the figure, and the segment gear 98 is restricted from rotating from this state. As a result, the suction lever 49 is fixed so as not to move in the state shown in FIG.

Next, the cam follower 71 is rotated by rotating the cam 82 of the stopper T8 and pushing the bolt 84 of the segment gear 66.
After the cam follower 71 is moved slightly away from the reversing cam TO to release the pressure applied by the spring, the cam follower 71 is moved in the axial direction together with the pin 69 to escape from the reversing cam 10, and the stopper 78 is returned to its original state. By doing this, as shown in FIG.
In addition, the claw base holder 35 is rotated by the stopper 42 on the stopper base 40 side and the stopper 56 on the suction lever 49 side. Since the claw 31 is regulated, the claw 31 is pressed against the claw base 3T by the rotating force of the claw shaft 19 and the elastic force of the claw spring 38, and is in the closed state. In this state, the rotation of the pawl shaft 19, that is, the opening and closing of the pawl 31, is not driven from the segment gear 66 side, but only from the gripping cam 87A and releasing cam 87B sides, and the pawl base is not rotated. Other than the different shape, it operates in the same way as a general single-sided netting machine. Note that since the suction lever 49 is not used, the intake device and the like connected to it are stopped. After preparing in this way, when printing is started, the paper 8 fed one by one onto the differential plate T passes through the swing device 6 and is gripped by the claw 9 of the impression cylinder 3.
It is wrapped around the blanket cylinder 2, and as it passes between the blanket cylinder 2 and the blanket cylinder 2, printing is applied to the surface on the blanket cylinder 2 side. When the winter cylinder rotates further and the claw 9 of the impression cylinder 3 and the reversing claw device 24 of the reversing cylinder 5 face each other, the cam follower 86 comes into contact with the large diameter part of the gripping cam 87A, and the cam lever 85 is moved to the torsion bar 9.
After the claw 31 opens by swinging against the elastic force of 0, the claw 31 closes due to the elastic force of the torsion bar 90 after passing the large diameter portion. Since the pawl 9 on the impression cylinder 3 side opens and closes simultaneously with the opening and closing of the pawl 31, the paper 8 is transferred from the pawl 9 to the pawl 31 and wound around its circumferential surface by the rotation of the reversing cylinder 5. When the reversing claw device 24 and the claw 9 of the second impression cylinder 4 face each other, the cam follower 86
passes through the large diameter part of the release cam 87B, the claw 31 opens and closes,
At the same time, the claws 9 open and close, so that the paper 8 is transferred to the second impression cylinder 4 and wound around its circumferential surface. Then, when the paper 8 passes between the blanket cylinder 2, printing is applied to the same side as the first color, and printing is performed on one side.

Next, the double-sided printing operation will be explained based on the figures up to FIG. 8 and the operation explanatory diagram of FIG. 10. When switching from single-sided printing to double-sided printing, the reversing cylinder 50 and reversing claw 25, which gripped the leading edge of the paper 8 when printing on one-sided side, now grips the tail end of the paper, changing the relative position of the impression cylinder 3 to the claw 9. To do this, the phase of the downstream can body including the reversing cylinder 5 and the upstream can body including the first impression cylinder 3 must be adjusted (not shown) to match the size of the paper 8. Depending on the device, the paper may be shifted by the size of the paper.

Further, the paper release timing of the cam that opens and closes the pawl 9 of the first impression cylinder 3 is delayed by an amount corresponding to y paper size. Then, the cam follower 71 for the reversing cam TO is connected to the reversing cam T.
When the segment gear 98 is moved in the axial direction so as to be in contact with the cam 87A and the rotation restriction of the segment gear 98 by the stopper 108 is released, the claw shaft 19 is moved to the reversing cam TO side, the gripping cam 87A1, and the releasing cam 87B.

The reversing gripping cam 88 is pushed forward and rotated from both sides, and the suction lever 49 becomes rotatable. When printing is started after preparing in this way, the paper that has been printed on the side on the blanket cylinder 2 side is caught in the claw 9 between the blanket cylinder 2 and the first pressure IJIM 3 in the same way as on the one-sided side. 8 is Ryogawa 2,
After the paper is released from the grip of the impression cylinder 3, the end of the paper is reversed as shown in Fig. 10(a) while being pressed against the circumferential surface of the impression cylinder 3 by air ejected from an air tube (not shown) around the reversing cylinder 5. Torso 5
It is wound around the impression cylinder 3 until it comes into contact with the cylinder 3. When the cam follower 102 of the segment gear 98 reaches the large diameter part of the suction lever rotating cam 1 a little before this, the segment gear 98 rotates against the elastic force of the torsion bar 103.
The suction lever 49 is connected to the pawl base holder 3 via the pinion 100.
5, rotate to the position f shown in FIG. Also, after an instant of delay, the cam follower T1 of the segment gear 66 reaches the large diameter part of the reversing cam 1σ-, the segment gear 66 rotates, and the pawl shaft 19 rotates greatly via the pinion 68, so the entire reversing pawl device 24 rotates significantly to the position shown in FIG. At this time, the reversing claw 25 is closed.

When the suction lever 49 has finished pushing aside the claw base holder 35 and no longer interferes with it, it returns to the position shown in FIG. 4 again. After the above operations are instantaneously performed, when the reversing claw device 24 and the suction lever 49 face the paper tail as described above, the hollow part of the rotary pulp 57 faces the suction port 6o of the pulp 58 to take in air. As a result, the end of the paper is attracted to the suction lever 49. When the can body rotates slightly from now on, the suction lever 49 rotates again to the position shown in FIG. 7 while holding the paper 8, and becomes the state shown in FIG. 10 (1)). At this time, due to the rotation of the claw shaft 19, the cam lever 85 attached to the other shaft end also rotates greatly, and as shown in FIG. 70 is removed, the pawl shaft 19 reciprocates as the cam follower 86 passes through the large diameter portion of the reversing gripping cam 88, and the reversing pawl 25 opens and closes. That is,
The suction lever 49 rotates to the point where the reversing claw 25 opens, supplies the paper tail, and the reversing claw 25 closes, so that the paper tail is caught in the reversing claw 25. At the same time, the first impression cylinder 3
The claw 9 opens and closes to release the paper 8 in its mouth, and the suction air to the suction lever 49 is cut off. Then, when the can body rotates further, the reversing gripping cam 88 disappears, and the reversing claw 25 rotates together with the reversing cylinder 5 while holding the tail of the paper in its mouth and holds the paper 8 in the 10th position.
As shown in figure (C), the cam follower T is
1 moves to the small diameter part of the reversing cam 70, and the compression coil spring 7
Due to T and the elastic force of the torsion bar 90, the entire reversing claw device 24 returns to the attitude shown in FIG. 4 and reaches the position where it contacts the second impression cylinder 4. Further, the suction lever 49 is also returned to the state shown in FIG. 4 by the elastic movement of the torsion bar 103. As a result of the paper tail being conveyed in this manner, the paper 8 is reversed and wound around the reversal cylinder 5 so that the printed surface comes into contact with the circumferential surface of the reversal cylinder 5. Reversing claw device 24 and suction lever 49
The state in which the has finished rotating is exactly the same as in the case of the single-sided side, and the reversing claw 25 opens and closes under the action of the release cam 87B, and the claw 9 of the second impression cylinder 4 opens and closes to release the paper 8. After changing the grip, it is wound around the impression cylinder 4, so that when it passes between the blanket cylinder 2 and the impression cylinder 4, printing is applied to the back side and double-sided printing is performed.

In this example, the present invention was applied to a printing press having a single cylinder arrangement in which only one double-diameter reversing cylinder was provided between both double-diameter impression cylinders. There are no limitations on the diameter of the cylinders or the number of cylinders provided between the two printing cylinders.

As is clear from the above explanation, according to the present invention, in a sheet-fed rotary printing press with a reversing mechanism, a reversing cam mechanism including a reversing cam and a cam follower pressed against the cam surface of the cam follower by a spring means, A cam lever is fixed on a rotating pawl shaft, and a cam follower pivotally attached to the cam lever is configured to be brought into pressure contact with a paper gripping cam, a reversing paper gripping cam, and a paper releasing cam by a spring means. The repelling pressure acts only when the reversing claw is in the closed state, and the cam follower of the reversing claw opening/closing cam mechanism directly rotates the claw shaft, so there is no excessive force on either cam follower or cam. In addition, since the moment load on the cam follower is reduced, the durability of the cam follower and cam can be greatly improved, and maintenance work can be reduced. Furthermore, since the opening and closing of the reversing claw is performed directly by the paper gripping and releasing cam mechanism without being affected by the reversing cam mechanism, the paper can be changed in the grip and the paper can be changed in the grip with good registration. Registration accuracy is improved and the quality of printed matter is significantly improved. Further, when changing from double-sided printing to single-sided printing, it is only necessary to stop the reversing cam mechanism, so switching is easy and operability is significantly improved.

[Brief explanation of the drawing]

1 to 10 show an embodiment of a sheet-fed rotary printing press with a reversing mechanism according to the present invention, and FIG. 1 is a cylinder arrangement diagram thereof, and FIG.
Figure 3 is a side view of the driving side of the reversing cylinder, Figure 3 is a side view of the operating side of the reversing cylinder, Figure 4 is an enlarged sectional view of the outer periphery of the reversing cylinder, and Figure 5 is an expanded view of the outer periphery of the shaft end of the reversing cylinder on the driving side. FIG. 6 is a partially cutaway view showing the outer periphery of the operating side shaft end of the reversing cylinder developed, and FIG. An enlarged sectional view of the outer periphery of the reversing cylinder shown corresponding to the figure,
) is a side view of the reversing claw, FIG. 8(b) is a side view of the small nail stand, FIGS. 8g and 9 are explanatory diagrams of the operation of single-sided printing, and FIG. 10 is an explanatory diagram of the operation of double-sided printing. 3.4...impression cylinder, 5...reversing cylinder, 8...paper, 10...nail shaft, 25...reversing claw, 66...pot...
Fist segment gear, 68@-・Fist pinion, 70...
・Reversing cam, 71＠−・・Cam follower, 77・・φ・
Compression coil spring, 85...cam lever, 86...cam follower, 87A@-, grip cam, 87B...
...Release cam, 88...Reverse gripping cam, 90...
・Torsion bar. Patent Applicant Komori Printing Machinery Co., Ltd. Agent Masaki Yamakawa (and one other person) Procedural Amendment (Mr. Gen. Commissioner of the Patent Office ``'''''57.1'1.''
9゜1, Indication of the case Patent Application No. 101886 of 19882, Name of the invention Sheet-fed rotary printing press with reversing mechanism 3, Person making the amendment Relationship with the case Patent Applicant: Jiu Jing-U - Reikishi H dimension - Showa - - Year - - Month - 1/16, Contents of amendment (1) "250°" in the second line from the bottom of page 8 of the specification and in the 6th line of the 12th layer of the specification was changed to " 180°”. (2) "94" in page 14, number 8, is corrected to r 92a J. (3) "Suction lever shaft 45" in the 8th to 7th lines from the bottom of page 15 is corrected to "suction drive shaft 94." (4) On page 21, line 10, “It will be absorbed.” and “
From now on, each side shall add the following sentence between the lines: "Almost at the same time, the pawl 9 of the first impression cylinder 3 opens and releases the paper 8 in its grip." (5) "The first impression cylinder 3...
...open and delete "again". (6) Correct the figures 3 and 5 as indicated in red on the attached sheet. that's all

Claims (1)

[Claims] A claw shaft mounted on the outer periphery of the reversing cylinder in parallel with the cylinder axis is rotated during the y half rotation of the reversing cylinder, and at the forward and backward positions of this rotation, the reversing claw on the claw shaft is opened and closed to pick up the paper. By pressing the paper and releasing it, the paper is reversed and transferred to and from the other cylinder to perform double-sided printing.
In a sheet-fed rotary printing press with a reversing mechanism, which performs single-sided printing by stopping the rotation of the reversing claw and only releasing the paper in its mouth, a reversing cam fixed to the machine body side;
a cam follower pivotally mounted on a swingable lever and pressed against the cam surface of the reversing cam by the elastic force of a spring means; a transmission member that converts swinging of the lever into rotation of the pawl shaft; A paper release cam fixed to the machine body, a paper gripping cam and a reversing paper gripping cam fixed to the machine body side with their cam surfaces facing each other, and a spring pivoted to a cam lever fixed to the claw shaft. A cam follower that is pressed against the cam surfaces of the paper gripping cam and the paper release cam during single-sided printing due to the elastic force of the means, and is pressed against the cam surfaces of the paper gripping cam and the inverted paper gripping cam during double-sided printing. A sheet-fed rotary printing press with a reversing mechanism.