JPH0471710B2 - - Google Patents

Description

Detailed Description of the Invention Object of the Invention (Industrial Application Field) The present invention relates to a sheet-fed rotary printing press capable of single-sided and double-sided printing, and particularly to a sheet-fed rotary printing press capable of printing on one side and both sides. The present invention relates to a suction paper pulling device configured to remove slack from sheets by applying force.

(Prior Art) Generally, when performing single-sided printing in this type of sheet-fed rotary printing press, as shown in FIG. At the point of contact with the transfer barrel 101, its front edge is transferred to the gripping claws 102 of the transfer drum 101. Next, the sheet P on the transfer cylinder 101 is transferred to the reversal cylinder 103 at the contact point between the transfer cylinder 101 and the reversal cylinder 103.
Its front edge is gripped by an inverted gripping claw 104,
As the reversing cylinder 103 rotates, the material is transferred from the transfer cylinder 101 onto the reversing cylinder 103. Then, the reversing cylinder 103
The leading edge of the sheet P is gripped by the gripping claw 106 of the impression cylinder 105 at the contact point between the sheet P and the impression cylinder 105,
Multicolor printing is performed on one side of the sheet P on the impression cylinder 105.

On the other hand, when printing on both sides, as shown in Figure 11,
The leading edge of the sheet P supplied onto the transfer cylinder 101 from the supply cylinder 100 is gripped by the gripping claws 102, and the trailing edge is suction-captured by the trapping member 107. Next, as the transfer cylinder 101 rotates, the leading edge of the sheet P once passes through the contact position between the transfer cylinder 101 and the reversing cylinder 103, and when the trailing edge of the sheet P reaches the contact position, the The operation of the capture member 107 is stopped, and the trailing edge of the released sheet P is transferred to the reversing cylinder 1.
03 is transferred to the reversing gripping claw 104. Then, as the reversing cylinder 103 rotates, the reversing gripping claws 104 are reversed at an angle of approximately 180 degrees from the gripping position, and the sheet P is turned over on the reversing cylinder 103, as shown by the chain line in the figure. Subsequently, in this state, the sheet is transferred from the reversing cylinder 103 onto the impression cylinder 105, and printing on the back side is performed on the impression cylinder 105.

By the way, normally the sheet P on the transfer cylinder 101
, sagging occurs due to preceding printing on a printing cylinder (not shown) disposed in front of the supply cylinder 100, and during the single-sided printing, the leading edge of the sheet P touches each gripping claw 102, 104, 106. Since the sheets are delivered sequentially, there is no fear that the gripping position will shift due to the slack, but in the case of double-sided printing, the edge of the sheet P on the transfer cylinder 101 is delivered to the reversing gripping claw 104 of the reversing cylinder 103. The problem is that the gripping position of the reversing gripping claws 104 becomes inaccurate due to slack in the sheet P, and if the sheet P is transferred to the impression cylinder 105 in that state and printing is performed on the back side, misregistration occurs between the sheet P and the previous printing. There is.

Therefore, in order to deal with this problem, for example, Japanese Patent Publication No. 54-30323 published on September 29, 1971, has proposed a suction device having a plurality of rotary suction members to remove sheets of paper on a transfer cylinder. A suction-type paper pulling device is shown which is provided along the trailing edge and, during surface printing, extends the sheet in the opposite direction to the direction of rotation of the transfer cylinder by the rotational movement of each rotary suction member. Also, Showa 56
In the Special Publication No. 56-51908 published on December 8, 2017,
A plurality of paper pulling rollers are arranged to move on the circumferential surface of the double-double cylinder, and each paper-pulling roller is provided with a trailing edge presser roller that can be pressed against and separated from the outside of the double-double cylinder. A trailing end presser roller is placed in pressure contact with the pulling roller to grip the trailing edge of the sheet, and in this state both rollers are moved diagonally backwards to apply tension to the sheet and remove slack. A grasping pattern drawing device configured as described above is disclosed.

(Problem to be Solved by the Invention) However, in the case of the former suction-type paper pulling device in these conventional configurations, since the sheet is stretched by the circular motion of the rotary suction member, the same suction Not only does the configuration of the drive system for the member become complicated, but there is also the problem that the required amount of extension cannot be obtained unless the turning radius of the member is set large and the size of the member is increased. In addition, in the case of the latter gripping type paper pulling device, there are disadvantages in that gripping marks are left on the sheet and noise is generated due to pressure contact between the paper pulling roller and the trailing end presser roller. Since the end presser rollers protrude from the circumferential surface of the double cylinder cylinder, there is also the problem that when an adjustment is made, they come into contact with an adjacent cylinder, causing trouble in the operation of the printing press.

Structure of the Invention (Means for Solving the Problems) The present invention has been made by focusing on the above-mentioned problems, and includes a supply cylinder for supplying sheets of paper, and a reversing cylinder for reversing the sheets from front to back. A reversing cylinder equipped with a mechanism,
It has a gripping part that is disposed between the supply cylinder and the reversing cylinder and grips the front edge of the sheet fed from the supply cylinder, and a plurality of gripping parts are attached to the support member and grip the trailing edge of the sheet. It is equipped with a capturing member for suction capturing and a transfer drum rotatably attached to a support shaft,
In a sheet-fed rotary printing machine that transfers a trailing edge of a sheet on a transfer cylinder to a reversing cylinder during double-sided printing, a set of lateral movement catching members located at least on the outermost side of the plurality of sets of catching members. is pivotally supported on a support member so as to be relatively rotatable, and the other set of capture members is integrally fixed to the support member, and the actuator fixed to the support member and the engaging member protruding from the lateral movement capture member are used. The supporting member and the lateral motion capturing member are operatively connected by engaging the joint pieces, and an operating lever with an engagement roller attached to the shaft end of the supporting member is attached, and the operating lever is held by a spring. The transfer cylinder is biased in a direction opposite to the rotating direction of the transfer cylinder, and the engaging roller is pressed into contact with a control cam fixed to a frame that supports the transfer cylinder, so that the support member is rotated in the forward and reverse directions as the transfer cylinder rotates. let me,
By this rotation, the other set of capturing members is directly rotated, and the horizontally movable capturing member is indirectly rotated in the forward and reverse directions via the actuating body and the engagement piece, and is rotatable about the support shaft. The segment arm is supported, and the operating shaft rotatably supported by the segment arm and the support member are operatively connected by gears, and the support member has a cam groove and cannot move laterally in the axial direction. A cam body fitted externally so as to be relatively rotatable and the operating shaft are operatively connected by gears, and a cam follower protruding from the lateral motion capture member is loosely fitted into the cam groove of the cam body, and the support In addition to the forward and reverse rotation of the member, the lateral motion capture member is moved laterally on the support member, and when double-sided printing is performed, the horizontal motion capture member is moved horizontally on the support member. , the stretching force in two directions is combined and applied: a stretching force in a direction opposite to the rotational direction of the transfer cylinder, and a stretching force in a direction perpendicular to the rotational direction.

(Function) By employing the above configuration, in the present invention, the trailing edge of the sheet on the transfer drum is reliably gripped by the lateral movement catching member and the catching member during double-sided printing, leaving no gripping marks. No dripping noise occurs. In addition, in the catching state, the suction parts of both the catching members are rotated in a direction opposite to the rotating direction of the transfer drum, and in addition to the above-mentioned rotation, the lateral moving catching member is moved on the support member by the operation of the axial movement mechanism. By transversely moving axially outward, ie in a direction perpendicular to the direction of rotation, the sheet is reliably stretched and sagged along the combination of these two directions of movement.

(Example) Hereinafter, an example embodying the present invention will be described in detail based on the drawings.

As shown in FIG. 2, a supply cylinder 1 and a reversing cylinder 2 having the same diameter are rotatably arranged at a predetermined interval in the frame of a sheet-fed rotary printing press. A gripping claw 3 for gripping the leading edge of the sheet P is provided on the circumferential surface of the reversing cylinder 2 so as to be openable and closable, and a gripping claw 3 for gripping the leading edge of the sheet P during single-sided printing is provided on the peripheral surface of the reversing cylinder 2. Also, a reversing claw 4, which constitutes a part of a reversing mechanism for gripping the trailing edge of the sheet P and reversing the sheet P from front to back during double-sided printing, is provided so as to be rotatable and open/closeable. The reversing action of the reversing cylinder 2 during double-sided printing is similar to the action explained based on FIG. Please refer to the specification and drawings of Japanese Patent Application No. 59-128299, filed on June 21, 2013. Further, a plurality of rotary cylinders (not shown) constituting a sheet moving mechanism and a printing mechanism of a sheet-fed rotary printing press are successively disposed in front of the supply cylinder 1 and behind the reversing cylinder 2. However, since these are known techniques, their explanation will be omitted.

Between the supply cylinder 1 and the reversing cylinder 2, there are two
A transfer drum 6 having a double diameter is arranged, and as shown in FIG. 1, both left and right ends of its shaft 7 are rotatably supported by bearings 8 to left and right frames 9. On the axis 7 there are a plurality of fixed segment arms 1
0 are arranged in a row at predetermined intervals, and a pair of movable segment arms 11 are attached to the shaft 7 so as to sandwich these fixed segment arms 10 from both left and right sides.
It is supported in a rotationally adjustable manner. and,
As shown in FIG. 2, a pair of recesses 13 are provided in the transfer drum 6 by the fixed and movable segment arms 10 and 11 and extend along the axial direction at positions separated by 180 degrees. A pair of circumferential surfaces of the divided transfer drum 6 have the same area as the sheet support surface 1.
2, and both movable segment arms 1
The length of the sheet support surface 12 in the circumferential direction can be changed according to the length of the sheet P by the rotational adjustment of 1.

A rotation shaft 14 extending parallel to the shaft 7 is disposed within one side of each recess 13, and a plurality of gripping claws 15 are arranged and fixed at equal intervals on the rotation shaft 14. (Only one is shown). As shown in FIG. 1, the cam follower 17 of the lever 16 fixed to one end of the rotating shaft 14 is engaged with the opening/closing cam 18 fixed to the inner surface of one frame 9, and the transfer drum 6 As the rotation shaft 14 is rotated back and forth within a predetermined angle range, each gripping claw 15 is opened and closed at the front edge of the sheet support surface 12 in the rotation direction, and when printing on one side, the supply cylinder 1 and transfer body 6
The front edge of the sheet P released from the gripping claws 3 of the supply cylinder 1 at the point of contact with each gripping claw 1 of the transfer cylinder 6
The front edge of the sheet P, which is gripped by the sheet P 5 and released from each gripping pawl 15 at the contact point between the transfer cylinder 6 and the reversing cylinder 2, is delivered to the reversing pawl 4 of the reversing cylinder 2. There is.

On the other hand, in the other side of each of the recesses 13, there are a lateral movement catching member 20 and a catching member 20a for suctioning and catching the edge of the sheet P on the sheet supporting surface 12, and the shaft 7
During double-sided printing, the trailing edge of the sheet P released from the lateral movement catching member 20 and the catching member 20a at the contact point between the transfer cylinder 6 and the reversing cylinder 2 is transferred to the reversing cylinder. It is designed to be handed over to the reversing claw 4 of No. 2.

Therefore, this lateral motion capturing member 20 and the capturing member 20
To explain in detail the structure of the mechanism a and its surroundings, a hollow shaft 21 as a support member is disposed in the recess 13 so as to extend parallel to the shaft 7, and a first
As shown in the figure, both left and right ends thereof are rotatably supported by both the movable segment arms 11. The inside of the hollow shaft 21 is an intake passage 22 whose left end is closed and whose right end is an opening 26.
The end on the opening 26 side is the movable segment arm 1 on the right side.
1 is exposed to the outside. A ring 23 is inserted into the right end of the shaft 7 and fixed to the outer surface of the boss portion of the right movable segment arm 11 via a screw 27.
The exposed end of is rotatably inserted.

A valve disk 25 is fitted onto the shaft 7 between the ring 23 and the bearing 8 on the right side so as to be able to rotate and slide relative to each other. At the same time, the locking pin 29 holds the frame 9 on the right side.
Rotation is restricted. A concave communication groove 30 extending along the circumferential direction so as to face the opening 26 of the hollow shaft 21 is formed on the inner surface of the valve disk 25, and corresponds to the length of the sheet supporting surface 12 of the transfer drum 6. The intake pipe 31 is formed to have a predetermined length and is connected to a part of the intake pipe 31 through a pipe to an intake blower (none of which is shown).

As shown in FIGS. 1, 3 and 4, the hollow shaft 21
A plurality of elongated holes 33 are bored at a predetermined interval on the left and right sides sandwiching the center of the transfer drum 6 (the center of the trailing edge of the sheet P), and these holes 33, the horizontal motion capturing member 20 and the capturing member 2 are placed at positions corresponding to
0a are arranged respectively. Among these capturing members, a set of lateral movement capturing members 20 disposed on the outside in the drawing are attached to the hollow shaft 21 through the support tube 34 so as to be relatively rotatable and laterally movable, and are located on the inside. A set of capture members 20a is fixed to the hollow shaft 21 by screws 19. The lateral motion capturing member 20 and the capturing member 20a each include an intake passage 35 extending in the longitudinal direction thereof, and
The proximal end of the intake passage 35 is communicated with the intake passage 22 of the hollow shaft 21 through the through hole 33, and the tip thereof is connected to a plurality of intake holes 36 provided on the distal end surfaces of the lateral movement capturing member 20 and the capturing member 20a. It is connected to a suction section 37. During double-sided printing, when the opening 26 of the hollow shaft 21 is disposed to face the communication groove 30 of the valve disk 25 as the transfer cylinder 6 rotates, the intake passage 22 is opened by the operation of the intake blower.
Air is sucked from the intake hole 36 through the through hole 33 and the intake path 35, and each trapping member 2
The sheet P on the sheet support surface 12 is placed on the suction unit 37 of 0.
The trailing edge of the blade is suctioned and captured. Note that 32 shown in FIG. 5 indicates both the capturing members 20, 2.
This is an adjustment knob provided at the tip of 0a, and by manually operating this knob, it is possible to stop the suction in each suction section 37 and adjust the suction force.

On the other hand, as shown in FIGS. 1, 2, and 5, an operating lever 3 is provided at the exposed end of the hollow shaft 21 between the right movable segment arm 11 and the ring 23.
9 is fixed at one end, and a control cam 40 (fifth
An engagement roller 41 that engages with the roller (see figure) is pivoted. A spring 43 is provided between the tip of the operating lever 39 and the outer edge of the right movable segment arm 11 via a guide rod 42, and the spring force urges the operating lever 39 to rotate clockwise in FIG. The engagement roller 41 is brought into pressure contact with the control cam 40. Further, as shown in FIGS. 1, 3, and 4, screws 48 are provided on the hollow shaft 21 at each position adjacent to one side of each lateral motion capturing member 20 except for the central pair of capturing members 20a. A body 44 is fixed, and an actuating roller 47 that fits into a notch 46 of an engaging piece 45 protruding from the center of one side of each lateral movement capturing member 20 is pivotally attached to the tip thereof.

As shown in FIG. 2, when the lateral movement catching member 20 and the catching member 20a are moved from a position close to the supply cylinder 1 to a position close to the reversing cylinder 2 as the transfer cylinder 6 rotates, the control cam 40 The actuating lever 39 is activated by the engagement of the engaging roller 41 with the control cam 4.
Based on the cam shape of 0, the transfer drum 6 is rotated by a predetermined angle in the direction opposite to the rotational direction of the transfer drum 6, and the hollow shaft 21, the pair of central capturing members 20a, and each actuating body 44 are rotated integrally with this. By fitting the actuating roller 47 and the notch 46, the lateral motion capturing members 20 on both the left and right sides are rotated. In this way, as the lateral motion capturing member 20 and the capturing member 20a rotate, each of the suction portions 37 moves on the circumferential surface of the transfer drum 6 in the circumferential direction opposite to the direction of rotation thereof (in the direction of arrow A in FIG. 5). is moved a predetermined amount along. Further, when the lateral movement catching member 20 and the catching member 20a are moved from a position close to the reversing cylinder 2 to a position close to the supply cylinder 1 with the rotation of the transfer cylinder 6, a portion of the control cam 40 different from the above-described portion is moved. Based on the cam shape, the actuating lever 39, hollow shaft 21, and actuating body 44 are each rotated back in the same direction as the rotational direction of the transfer drum 6 and at the same angle as the rotation angle, and each suction part 37 is rotated. It is adapted to be returned in the same circumferential direction as the rotational direction of the transfer drum 6.

As shown in FIG. 1, both left and right movable segment arms 11
An actuating shaft 51 is rotatably supported in between so as to extend parallel to the hollow shaft 21, and a pair of left and right engaging teeth 52 are carved in the center thereof.
Each capturing member 2 except for the central pair of capturing members 20a
A sector gear 53 is fixed at each position facing 0. Further, as shown in FIG. 6, a connecting gear 54 that meshes with each of the engaging gears 52 of the actuating shaft 51 is fixed on the hollow shaft 21 between the pair of capturing members 20a in the central part, and Rotation can be transmitted to the operating shaft 51.

As shown in FIGS. 1, 3, and 7, a plurality of cam bodies 55 are mounted on the hollow shaft 21 in a position close to the other side surface of the lateral motion capture member 20 except for the pair of capture members 20a in the central portion, and are mounted on the hollow shaft 21 so as to rotate relative to each other. screw 57
axial movement of the hollow shaft 21 is prevented via a key 58 fixed to the hollow shaft 21. A driven tooth portion 56 that meshes with the sector gear 53 on the operating shaft 51 is carved on the outer circumferential surface of one side of each cam body 55. 52, is transmitted to the cam body 55 via the sector gear 53 and the driven gear 56, and rotates relative to the hollow shaft 21. Further, as shown in FIGS. 3 and 8, a concave cam groove 59 is formed on the outer circumferential surface of the central portion of the cam body 55 obliquely at a predetermined angle with respect to the rotating surface of the cam body 55. A cam follower 61 is loosely fitted in 59 and is pivoted to a support piece 60 protruding from the base end of the other side of the lateral motion capturing member 20. Note that the cam groove 59 disposed on the right side and the cam groove 59 disposed on the left side have a line-symmetrical shape.

The connecting gear 54, the operating shaft 51, the sector gear 53, the cam body 55, etc. constitute the axial movement mechanism of this embodiment, and as the circumferential movement mechanism operates, the lateral movement capturing member 20 moves toward the transfer drum 6. When the hollow shaft 21 is rotated in a direction opposite to the direction of rotation of the hollow shaft 21
The cam body 55 is relatively rotated in the same direction as the rotation of the cam groove 59 and the cam follower 61.
By engaging with the cam grooves 59, the lateral movement capturing members 20 are moved outward along the hollow shafts 21 by a predetermined movement amount depending on the shape of the cam grooves 59, and each suction portion 37 is moved outwardly along the hollow shaft 21.
is moved axially outward on the circumferential surface of the transfer drum 6. Moreover, each capturing member 2
0 is rotated in the same direction as the rotational direction of the transfer drum 6, the hollow shaft 21 and the cam body 55 are rotated in the opposite directions, and the suction portions 37 of the lateral motion capture member 20 are rotated in the same direction as the rotation direction of the transfer drum 6. 6 and returned to the axial direction.

Next, the operation of the sheet-fed rotary printing press configured as above will be explained.

Now, during single-sided printing, the leading edge of the sheet P on the supply cylinder 1 is delivered to the gripping claw 15 of the transfer cylinder 6, and as the transfer cylinder 6 operates half a rotation, the leading edge of the sheet P is transferred to the reversing cylinder 2.
The leading edge of the sheet P is delivered to the gripping claw 106 of the impression cylinder 105 (see FIG. 10) without the reversing claw 4 being reversed, and the leading edge of the sheet P is delivered to the gripping claw 106 of the impression cylinder 105 (see FIG. 10). In this step, multicolor printing is performed on one side of the sheet P. During this single-sided printing, the leading edge of the sheet P is sequentially transferred to the gripping claws of the adjacent cylinders, and unlike during double-sided printing, there is no risk of misalignment of the gripping position. The lateral movement catching member 20 is activated by suction by stopping the operation of the intake blower connected to the lateral movement catching member 20 and the lateral movement catching member 20a, or by closing an unillustrated cock on the intake pipe 31. Try not to do that. However, the actuating lever 39 is swung based on the engagement between the control cam 40 and the engagement roller 41, and the suction portions 37 of the lateral motion capturing member 2 and the capturing member 20a0 are moved in the circumferential direction and the axial direction of the transfer drum 6, respectively. will be moved. Note that, unlike the configuration of the embodiment described above, during single-sided printing, the operating lever 3 is moved to a position where the control cam 40 and the engagement roller 41 are disengaged by manual operation.
By providing an appropriate release means for rotationally arranging 9, it is possible to stop the idle operation of the lateral motion capturing member 20 and the capturing member 20a.

On the other hand, when double-sided printing is started, the intake blower is driven and the intake pipe 31 is opened. Then, the leading edge of the sheet P supplied from the supply cylinder 1 is gripped by the gripping claws 15 of the transfer cylinder 6,
The rear edge portions are the horizontal movement capturing member 20 and the capturing member 20a.
When the transfer drum 6 is rotated to a position where it comes into contact with the
0, and through this communication groove 30, the intake pipe 31
and the intake passage 22 of the hollow shaft 21 are in communication with each other, and the lateral motion capturing member 20 is moved by the intake action of the intake blower.
Air is sucked from the suction portion 37 of the capturing member 20a. Therefore, the trailing edge of the sheet P on the sheet support surface 12 of the transfer cylinder 6 is sucked and held by each suction section 37, and in this state, the trailing edge of the sheet P is held between the transfer cylinder 6 and the reversing cylinder. It is transported toward the contact point position with 2.

At this time, the control cam 40 accompanying the rotation of the transfer drum 6
Based on the engagement with the engagement roller 41, the actuating lever 39 is rotated by a predetermined angle clockwise around the hollow shaft 21 as shown in FIGS. A pair of capturing members 20a
is rotated in a direction opposite to the rotational direction of the transfer drum 6, and the lateral motion capture members 20 on both left and right sides are also rotated in a circumferential direction opposite to the rotational direction of the transfer drum 6 via the operating body 44. be done. Further, in synchronization with this, the rotation of the hollow shaft 21 is transmitted to the cam body 55 via the connecting gear 54, the engaging tooth portion 52, the operating shaft 51, the sector gear 53, and the driven tooth portion 56, and the cam body 55 is relatively rotated by a predetermined angle on the hollow shaft 21 in a direction opposite to the rotational direction of the transfer drum 6, and the lateral motion capturing member 20 conforms to the shape of the cam groove 59 based on the engagement between the cam groove 59 and the cam follower 61. They are each moved axially outward of the transfer drum 6 by different amounts of movement. Therefore,
The suction portion 37 of the lateral movement capturing member 20 suctions and captures the trailing edge of the sheet P on the peripheral surface of the transfer drum 6, and moves in the opposite circumferential direction as shown by the arrow in FIG. and the movement outward in the axial direction, and the sheet P is moved diagonally outward to the rear, and this movement causes a stretching force to act on the trailing edge of the sheet P along the direction of movement. Therefore, both the deflection along the circumferential direction and the deflection along the axial direction occurring in the sheet P on the transfer cylinder 6 are expanded and removed.

When the lateral movement catching member 20 reaches the position where it comes into contact with the reversing cylinder 2, the trailing edge of the sheet P is gripped by the reversing claw 4 of the reversing cylinder 2, and immediately thereafter the hollow shaft 2
When the opening 26 of the sheet P is removed from the communication groove 30 of the valve disk 25, the suction action is stopped and the trailing edge of the sheet P is released from each suction portion 37. At this time, since the slack of the sheet P on the transfer drum 6 has been removed, the reversing claw 4 is
The transfer operation can be performed accurately without any positional deviation. Thereafter, the sheet P is turned over on the reversing cylinder 2 with the above-described reversing operation of the reversing claw 4, and the front edge of the turned sheet P is delivered to the gripping claw 106 of the impression cylinder 105. Accurate backside printing without misregistration is performed on 105.
In addition, in the transfer cylinder 6, after the lateral movement catching member 20 which has released the sheet P is returned along the circumferential direction and the axial direction as it is forwarded to the supply cylinder 1 side,
The trailing edge of the next sheet P is captured by suction at the position where it is in contact with the supply cylinder 1. Incidentally, in the above-mentioned embodiment, a pair of capturing members 20 and 20a were described, but the present invention is not limited to this. A plurality of sets of lateral movement capturing members 20 are provided, and the inclination of the cam groove 59 is adjusted to As shown by a solid line and a broken line in FIG. 8, the inner side may be smaller and the outer side may be larger, and the sliding amount of the lateral movement capturing member 20 may be made to increase sequentially from the inside to the outside.

(Effects) As detailed above, according to the present invention, the movement in the circumferential direction and the movement in the axial direction are combined with the suction part in each catching member suctioning and trapping the trailing edge of the sheet. Since the sheet is moved in the direction of the transfer cylinder, it is possible to reliably remove the slack in the sheets on the transfer cylinder and reliably prevent the occurrence of misregistration when printing on the back side. Since the paper is moved on the circumferential surface of the cylinder and does not protrude outward, troubles such as contact with adjacent cylinders can be avoided.Furthermore, the sheets are captured by suction, unlike mechanical gripping. There is no risk of gripping marks being left on the paper or noise being generated, and in addition, compared to stretching sheets by circular motion, a large amount of stretching can be obtained with a simpler and more compact configuration.
It has a special effect of solving all the drawbacks of the conventional device.

[Brief explanation of drawings]

Fig. 1 is a vertical sectional view of a transfer cylinder showing an embodiment of the present invention, Fig. 2 is a side view of main parts of a sheet-fed rotary printing press, and Fig. 3 is a longitudinal sectional view of main parts showing a suction paper pulling device. 4 is a top view showing the suction part, FIG. 5 is a vertical sectional view of the main part of the transfer drum showing the circumferential movement mechanism, and FIGS. 6 and 7 are a top view of the transfer drum showing the axial movement mechanism. 8 is a partial front view of the cam body showing the shape of the cam groove, FIG. 9 is a plan view of a sheet showing the paper pulling action, and FIGS. FIG. 11 is a side view of a sheet-fed rotary printing press showing the operation during conventional single-sided and double-sided printing, respectively. 1 is a supply cylinder, 2 is a reversing cylinder, 4 is a reversing claw, 6 is a transfer cylinder, 15 is a gripping claw, 20 is a lateral motion capturing member, 20
a is a capturing member, 21 is a hollow shaft as a supporting member;
39 is an operating lever, 44 is an operating body, 51 is an operating shaft, 53 is a sector gear, 54 is a connecting gear, 55 is a cam body, and P is a sheet of paper.

Claims (1)

[Claims] 1. A supply cylinder 1 for supplying sheets P, and a reversing cylinder 2 equipped with a reversing mechanism 4 for reversing the sheets P from front to back.
and a gripping part that is disposed between the supply cylinder 1 and the reversing cylinder 2 and grips the front edge of the sheet P supplied from the supply cylinder 1, and a plurality of sets are attached to the support member 21 to hold the sheets P. The transfer cylinder 6 is equipped with a capture member that suctions and captures the trailing edge of the sheet P and is rotatably attached to a support shaft 7. During double-sided printing, the transfer cylinder 6
In a sheet-fed rotary printing machine in which the trailing edge of the upper sheet P is delivered to the reversing cylinder 2, at least one set of lateral movement capturing members 20 located at the outermost side of the plurality of sets of capturing members is supported. Member 21
A structure in which the capturing member 20a of the other set is integrally fixed to the supporting member 21, and an actuating body 44 fixed to the supporting member 21 and a protruding structure on the lateral movement capturing member 20 A configuration in which the support member 21 and the lateral motion capture member 20 are operatively connected by engaging the engagement piece 45 that has been provided, and an actuation lever 39 in which the engagement roller 41 is pivotally attached to the shaft end of the support member 21. Installation, the actuation lever 39
The control cam 4 is urged by a spring 43 in a direction opposite to the rotating direction of the transfer cylinder 6, and the engagement roller 41 is fixed to the frame 9 that supports the transfer cylinder 6.
0, the support member 21 is rotated in the forward and reverse directions as the transfer drum 6 rotates, and this rotation causes the other set of trapping members 20a to be directly and horizontally movable trapping member 2
0 has a configuration in which the segment arm 1 is rotatably rotated in the forward and reverse directions via the actuating body 44 and the engagement piece 45, and the segment arm 1 is rotatably mounted on the support shaft 7.
1, and the operating shaft 51 rotatably supported by the segment arm 11 and the support member 21 are connected to the gear 5.
2 and 54, and a cam body 55 which has a cam groove 59 and is externally fitted to the supporting member 21 so that it cannot move laterally in the axial direction but can rotate relative to the operating shaft 51. A cam follower 61 protruding from the lateral motion capture member 20 is loosely fitted into the cam groove 59 of the cam body 55, and is operatively connected by gears 53 and 56.
In addition to the forward and reverse rotation of the support member 21, the lateral motion capturing member 20 is moved laterally on the support member 21 in accordance with the forward and reverse rotation of the support member 21. It is characterized by applying a combined stretching force in two directions, a stretching force in a direction opposite to the rotational direction of the transfer cylinder 6 and a stretching force in a direction perpendicular to the rotational direction, to the sheet P. Adsorption paper pulling device for sheet-fed rotary printing presses.