JPH0230533A - Sheet paper transfer mechanism in offset press - Google Patents

Abstract

PURPOSE:To transfer a sheet paper with little blur onto an impression cylinder with the rotation of a transfer cylinder by a method wherein in a one-side and multicolor printing one holding member is rotated by a reversing means to be engaged with a fixed auxiliary holding member to hold a sheet paper on the peripheral surface of a supply cylinder. CONSTITUTION:In a one-side and two-color printing, a second support shaft 14 of a transfer cylinder 4 is unrotatably held, and a second holding claw 16 is unmovably locked in a slightly open state. A sheet paper 11 on a guide face 8 of a supply cylinder 5 is held by a first holding claw 15 of the transfer cylinder 4 and a claw receiver 17 of an auxiliary holding member at the leading end thereof. The sheet paper 11 held on the supply cylinder 5 with the right surface out is reversedly transferred from the supply cylinder 5 onto the transfer cylinder 4. At the contact position of the transfer cylinder 4 with an impression cylinder 2, the leading end of the sheet paper 11 is released from the first holding claw 15, held on the peripheral surface of the impression cylinder 2 with the right surface out by a clamp claw 19 of the impression cylinder 2, and fed with the rotation of the impression cylinder 2. Then, by a left blanket cylinder 1, a second color printing is applied on the surface of the sheet paper 11 which has been already subjected to a first color printing by a right blanket cylinder 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a sheet transfer mechanism in an offset printing press.

[Conventional technology]

In order to print on both the front and back sides of a sheet using an offset printing machine, a pair of left and right impression cylinders 120 are used, as shown in FIG.
A supply cylinder 123 with a double diameter is arranged between them via a transport cylinder 121 and a transfer cylinder 122, and the right blank cylinder 124 prints on the surface of the sheet P held on the right impression cylinder 120. administer. Thereafter, this sheet P is sent face up to the supply cylinder 123 via the transport cylinder 121. Then, the trailing edge of the sheet P on the supply cylinder 123 is captured by a plurality of claws 125 lined up in the width direction of the transfer cylinder 122, and the sheet P is sent to the transfer cylinder 122 with its face facing up. Later, left impression cylinder 12
The left bran held upside down on 0 lpH2
4, printing is applied to the back side.

In addition, in order to perform single-sided color printing using the offset printing machine described above, as shown in FIG. When being sent to the glaze 122, the front end of the sheet P is captured by the claw 125 of the transfer cylinder 122 and transferred to the left impression cylinder 120. Therefore, the sheet P held face up on the left impression cylinder 120 is printed with two-color ink.

In the offset printing machine described above, the claw 125 of the transfer cylinder 122 is a claw piece 12 whose base end is externally fitted and fixed to a pair of shafts 126 and 127 arranged above and below, as shown in FIG.
8,129, and is rotated to open and close according to the rotation of the shaft 126127, as shown in FIG. 17, during single-sided two-color printing. Then, on the supply cylinder 123 side, both claw pieces 128,1
29 shifts from the open state to the closed state, the leading edge of the sheet P on the supply cylinder 123 on which the negative color is printed is captured. After that, as the transfer cylinder 122 rotates, the claw 1
25 to the left impression cylinder 120 side, both claw pieces 128
, 129 are opened, and the sheet P captured by the gripping claw of the left impression cylinder 120 is held on the circumferential surface of the left impression cylinder 120.
Two-color printing is applied.

On the other hand, during double-sided printing, the shaft 12 in FIG.
6. By reversing the vertical position of 127, the claw 125
is reversed to the position indicated by the two-dot chain line as shown in FIG. Then, the trailing edge of the single-sided printed sheet P held on the circumferential surface of the supply cylinder 123 is held by both claw pieces 128, 1.
29 and moved onto transfer 111ii1122.

[Problem to be solved by the invention]

In the offset printing machine described above, the pawl 125 of the transfer cylinder 122 is opened and closed by a shaft 126 using an opening/closing mechanism using a cam.
．． This depends on the rotation of 127. However, due to cam errors during manufacturing which are unavoidable in metal machining, the dimensions of the shafts 126 and 127 and the pawls 12B and 129 do not correspond accurately to the design dimensions, and there is some deviation. For this reason, all the claw pieces 128, 129 do not always rotate synchronously along the same locus, but slight differences occur.

Therefore, during reversal, the gripping operation of the sheet P by the claws 125 may not be performed in a stable manner, and the sheet P sent from the supply cylinder 123 may not be held at a predetermined position on the transfer cylinder 122. For this reason, the position of the sheet P on the left impression cylinder 120 may also be misaligned, and the position of the two-color margin printing on the sheet P may be slightly deviated from the desired position. Therefore, different colors printed adjacent to each other will overlap, and the commercial value of the printed matter will be significantly reduced.

In addition, when printing on both sides of the sheet P, the transfer cylinder 12
Since the second pawl 125 is inverted while protruding from the peripheral surface of the transfer cylinder 122 while holding the trailing edge of the sheet P in its grip, the paper is fed unstablely as in the case of two-color printing, and the pawl 125 A sheet P may fall off from the paper 125. Therefore, not only the sheet P is wasted, but also blank printing may be performed on the circumferential surface of the impression cylinder 120, which necessitates complicated work such as cleaning the impression cylinder 120. For this reason, there is a need for a sheet transfer device that is capable of stably feeding paper.

The first and second inventions of the present application have been made to solve the above-mentioned problems, and the purpose of both inventions is to hold a sheet of paper in a predetermined position and to print multiple colors on one side. It prevents duplicate printing of different colors and enables high-quality printing, and also prevents wasteful use of printing paper and complicated incidental work caused by unstable paper feeding during double-sided printing. In order to avoid this problem, it is an object of the present invention to provide a sheet transfer mechanism for an offset printing machine that can perform stable paper feeding.

[Means to solve the problem]

In order to achieve the above object, the first invention of the present application includes a transfer cylinder disposed between a supply cylinder and an impression cylinder, and a pair of support shafts provided so as to be rotatable in the longitudinal direction of the transfer material. a pair of upper and lower sheet gripping members respectively fixed to the sheet, and a reversing mechanism for reversing these gripping members around the reversal axis via both support shafts;
In a sheet transfer mechanism of an offset printing machine capable of single-sided multicolor printing and double-sided printing, the sheet transfer mechanism is linked to the reversing mechanism and supports both support shafts parallel to each other, so that during single-sided printing, the feed cylinder is A rotating support that rotates only one gripping member around an inversion axis in order to capture a sheet on a peripheral surface, and a support that supports the other gripping claw when capturing a sheet during double-sided printing. a drive mechanism that drives the other gripping claw to open and close by rotating the shaft closer to the center than the periphery of the transfer cylinder;
urging means for urging the gripping members in a direction to engage each other when the gripping members are reversed during the double-sided printing;
During the one-sided printing, the gripping member is fixed on the rotation locus of one of the gripping members rotated around the axis of the support, and is engaged with the one gripping member to hold the sheet on the supply circular surface. The gist is that an auxiliary gripping member is provided.

In addition to the above-mentioned solution in the first invention, the second invention of the present application prevents rotation of the other gripping member via the other support shaft during single-sided printing, and prevents rotation of the other gripping member during double-sided printing. The gist is that a rotation regulating member is provided that allows the rotation.

[Effect]

By adopting the above-mentioned means, the first invention of the present application has the following advantages:
When printing multiple colors on one side, one of the gripping members is rotated by the reversing means and engaged with the fixed auxiliary gripping member to grip the sheet on the peripheral surface of the supply cylinder, and then the sheet for transfer is rotated. As the sheet rotates, the sheet is transferred onto an impression cylinder in a state with little blurring.

Further, when the re-grip member is reversed by the reversing means to print on both the front and back sides of the sheet, the re-grip member is urged by the urging means and engages with the sheet sandwiched, Immediately before receiving a sheet, the rotation locus drawn by the other gripping member protrudes by a small amount from the transfer peripheral surface.

Furthermore, in the second aspect of the present invention, during single-sided printing, the other gripping member is held unrotatable by the rotation restricting means. As a result, the other gripping member does not take part in capturing the sheet, and the sheet is stably captured by the first gripping member, which rotates and abuts against the fixed auxiliary gripping member. It will be done.

〔Example〕

Hereinafter, a first embodiment in which the present invention is embodied in an offset printing machine for two-color printing will be described in detail with reference to FIGS. 1 to 15.

The sheet transfer mechanism of this embodiment will be explained in detail with reference to FIGS. 2 and 3.

In the machine frame of the offset printing press, there are impression cylinders 2 facing each other to a pair of blank cylinders 1 arranged on the left and right sides, and one supply cylinder with a transport cylinder 3 and a transfer cylinder 4 in between. 5 is arranged in the center, and gears attached to one end surface of the winter clothes 1 to 5 mesh with each other, so that these trunks 1 to 5 rotate in synchronization.

The supply cylinder 5 is formed to have a diameter double that of the blank cylinder 1, impression cylinder 2, conveyance cylinder 3, and transfer cylinder 4, and has a pair of cylinder grooves 6 and 7 recessed at opposing positions in the radial direction. The outer peripheral surface of the supply cylinder 5 separated into two by 6 and 7 constitutes a pair of sheet guide surfaces 8. A gripping claw 9 is provided in the vicinity of one wall of each of the trunk grooves 6 and 7 so as to be openable and closable, and a sucker 10 disposed near the other wall of the trunk grooves 6 and 7 is incorporated into the machine base. It communicates with a blower (not shown).

Further, on the sheet guide surface 8 of the supply cylinder 5, a sheet 11 printed in one color by the blank cylinder 1 on the right impression cylinder 2 is supported, and its leading edge is held in the mouth. It is gripped by the claws 9, and the rear edge is suctioned and held by the sucker 10.

One body groove 12 is formed in the transfer 4, and this body a
12 alternately face the cylinders a6 and 7 of the supply cylinder 5. Further, a first support shaft 13 and a second support shaft 14 are arranged in the body groove 12 along the direction toward the center of the transfer member 4 .

As shown in FIG. 1, a plurality of annular supports 57 are attached to the first support shaft 13 via arc-shaped closing plates 57a arranged at equal intervals, and these annular supports 57
A first gripping pawl 15 as a sheet gripping member is formed on each of the two.

The second support shaft 14 also has a second gripping claw 16 which also serves as a sheet gripping member and corresponds to the first gripping claw 15.
is supported. Then, the rotation of the second support shaft 14 in conjunction with the operation of the drive mechanism 70 described later causes the second gripping claw 16 to be activated, and the operation of the reversing mechanism 33 described later causes the first gripping claw 15 to be activated.
Each can be rotated to open and close. In addition, a claw receiver 17 as an auxiliary gripping member is provided on the inner side wall surface of the trunk groove 12.
is fixedly supported, and its outer end surface is on the same circumferential surface as the outer circumferential surface of the transfer member 4.

Further, as shown in FIG. 14, the mounting pieces 107 and 1 fixed to the first and second support shafts 13.
A pushing spring S serving as a biasing member is hung between 08 and 08. Then, by this pushing spring S, both support shafts 13.1
4, the first and second gripping claws 15 and 16 are biased in the closing direction so that they engage with each other.

Further, the impression cylinder 2 has the same diameter as the transfer cylinder 4, and is provided with a cylinder groove 18 that can face the cylinder groove 12 of the transfer cylinder 4. Further, in the cylinder groove 18 of the impression cylinder 2, a holding claw 19 for capturing and holding the sheet 11 is provided so as to be rotatable in opening and closing.

During single-sided, two-color printing, the second support shaft 14 of the transfer member 4 is held in a non-rotatable state, and the second gripping claw 16 is locked inoperably in a slightly held state. Then, as shown in FIG. 2, the sheet 11 on the guide surface 8 of the feed 5 is
is the first gripping claw 15 and the claw receiver 1 whose front edge is the transfer charge 4
7. The sheets 11 are held face up on the feed 5 and are transferred from the feed 5 face down onto the transfer 4. Furthermore, at the contact point of the transfer charge 4 with the impression cylinder 2, the front edge of the sheet 11 is released by the first gripping claw 15, and the impression cylinder 2 is held by the gripping claw 19 of the impression cylinder 2. The sheet 11 is held face up on the circumferential surface of the impression cylinder 2, and moves with the rotation of the impression cylinder 2, so that the surface of the sheet 11, which has already been printed with the first color by the right impression cylinder 2, is covered with the left impression cylinder 2. Two-color printing is performed on cylinder 1.

On the other hand, during double-sided printing, the second support shaft 14 of the transfer charge 4 is unlocked and the second gripping claw 1
6 has been moved to a rotatable state. Then, the sheet 11 of the feed material 5 on the sheet guide surface 8 once passes through the contact point between the supply cylinder 5 and the transfer material 4 as the feed material 5 rotates. When the trailing edge of the sheet 11 reaches this contact position, the suction action of the soaker 10 on the feed material 5 is stopped by switching the operation of the blower, and the trailing edge of the sheet 11 is released from the feed material 5. In addition, the first and second transfer fee 4
It is gripped by gripping claws 15 and 16.

Then, as the transfer charge 4 rotates, the gripping claws 15 and 16 are reversed from their gripping positions as shown by the chain lines, and the sheet 11 is transferred onto the transfer charger 4 while facing up. The sheet 11 is transferred in this state to the contact point between the transfer charge 4 and the impression cylinder 2, where its front edge is gripped by the gripping claw 19 of the impression cylinder 2 and turned over on the impression cylinder 2. , printing is done on the back side.

Next, the configuration of the transfer fee 4, which is the main part of the present invention, will be explained in detail.

As shown in FIG. 1, a main shaft 24 is rotatably supported between a pair of bearings 23 between left and right side frames 2122 of the printing press. At the left end of the main shaft 24, a driving gear 25 and a transmission gear 26, which are provided so as to be able to rotate together with the main shaft 24, mesh with gears (paths shown in the figure) provided on the impression cylinder 2 and the feed material 5, respectively, so that the main shaft 24 is rotated during printing. The rotation of the feed material 5 is transmitted to the impression cylinder 2 through the pressure cylinder 2, so that these cylinders rotate in synchronization.

The main shaft 24 is located inside the left and right side frames 21 and 22.
Above are the left and right wall plates 2 that constitute the left and right end walls of the transfer fee 4.
7 and 28 are fixed, and a plurality of guide segment pieces 29 are fixed at equal intervals on the main shaft 24 between the two at 27 degrees and 28 degrees. The outer peripheral surface of these segment pieces 29 constitutes the sheet guide surface 30 of the transfer charge 4, and the recesses formed in each segment piece 29 form the body groove 1 of the transfer charge 4.
2 are configured.

A reversing mechanism 33 is provided between the left frame 21 and the left wall plate 27 for reversing the first and second gripping claws 15 and 16 during double-sided printing. This reversing mechanism 3
The configuration of No. 3 will be explained based on FIG. 1.4.5.

That is, a shaft pin 34 protruding leftward is formed on the outer circumferential portion of the left side wall plate 27, and an annular swinging member 35 surrounding the main shaft 24 is attached to the shaft pin 34, and a bearing cylinder portion is provided in a part of the shaft pin 34. It is rotatably supported at 36. This swinging member 35
A sector gear 37 is fixed on the top at a position diametrically opposed to the shaft pin 34 with the main shaft 24 in between, and its tooth surface 3
8 is formed along an arc centered on the shaft pin 34.

In the vicinity of the bearing cylinder part 36, a grip cylinder part 41 having a slit 40 is formed in the swinging member 35, and a roller shaft 43 can be tightened and fixed at any position in the left and right direction with a bolt 42 inside the grip cylinder part 41. It is inserted. and,
A running roller 44 is rotatably attached to the left end of the roller shaft 43.

A cam mounting tube 46 that loosely fits onto the main shaft 24 is fixed to the right end surface of the left bearing 23, and the outer peripheral surface of the cam mounting tube 46 is used for both sides of the left side during double-sided printing and single-sided two-color printing. The operating cam 47 for printing and the operating cam 48 for single-sided two-color printing on the right side are selectively engaged.

A spring support pin 51 is protruded from the left side of the left side wall plate 27 of the transfer charge 4, and a guide rod 5 is attached to this support pin 51.
2 is rotatably supported by an annular portion 53 at one end.

Further, a spring bearing piece 54 is formed on the swinging member 35 and protrudes to the right at a position facing the roller shaft 43 with the shaft pin 34 interposed therebetween. The end is inserted loosely. A compression spring 56 is fitted onto the guide rod 52 between the support pin 51 and the spring holder piece 54 so as to wrap around the guide rod 52 .

Then, by the action of the compression spring 56, the swinging member 35 is urged to rotate in the clockwise direction in FIG. It is brought into pressure contact with the color printing operating cam 48.

As shown in FIG. 1, on the outer surfaces of the left and right side wall plates 27.28 at positions corresponding to 1IPla12 of the transfer charge 4, there are a pair of shaft supports 59.6 facing each other with screws 58.
0 is formed. A rotary shaft 61 rotatable about a single reversal axis 68 extending parallel to the rotational axis of the main shaft 24 is supported on the left shaft support 59, and a pinion 64 is fixed to the left end thereof by a screw 63. At the same time, a cylindrical bearing member 65 is formed on the right end surface. Also,
A rotating shaft 62 rotatable about the reversal axis 68 is supported on the right shaft support 60, and a bearing member 66 facing the left bearing member 65 is formed on the left end surface thereof.

A pair of concave fitting holes 67a and 67b are formed in the mutually opposing end surfaces of the left and right bearing members 65 and 66, respectively, and inside one fitting hole 67a there is a hole extending parallel to the rotational axis of the main shaft 24. Both ends of the first support shaft 13 are fitted and fixed.

Further, both ends of the second support shaft 14 are rotatably supported within the other fitting hole 67b of the bearing member 6566. A slit 114 is formed in the outer circumferential portion of the bearing member 65.66, and a prismatic reinforcing shaft 107 extending parallel to the support shaft 13.14 is fixed thereto.

When the transfer charge 4 is rotated with the running roller 44 engaged with the operating cam 47 during double-sided printing, the swinging member 35 is rotated via the roller shaft 43 based on the cam shape of the operating cam 47. It is oscillated by a predetermined angle about the pin 34, and due to the engagement between the sector gear 37 and the pinion 64, the left rotating shaft 61 and the bearing member 65 are reciprocated at an angle of approximately 200°.

Therefore, the first and second support shafts 13 and 14 and the reinforcing shaft 107 rotate the right bearing member 66 as the left rotation shaft 61 rotates, and the closing plate 57 rotates around the reversal axis 68.
The annular support 57 is reciprocally rotated, that is, reversely rotated within a preset range of 200° via a, and then the second
The support shaft 14 follows the closing plate 57a and is inverted while
Regardless of the first support shaft 13, the drive mechanism 70 performs reciprocating rotation at both end portions around its own axis.

As shown in FIG. 5, during single-sided printing, the running roller 44 engages with the operating cam 48, so the swinging member 35 swings in a different trajectory according to the shape of the cam, and the rotating shaft 6
1 reciprocates the annular support body 57 in accordance with this, and since the drive means 7o is in an inactive state, the second support shaft 14
It also does not rotate on its axis.

Next, the first gripping claw 15 of the annular support body 57 supported on the first support shaft 13, the second gripping claw 16 supported on the second support shaft 14, and further the body groove 12. The claw receiver 17 fixed to will be explained.

As shown in Figures 2 and 5, the first
and second support shafts 13 and 14 are arranged along the radial direction of the transfer charge 4, of which the second support shaft 14 is located outside the circumference of the transfer charge 4, and is located inside the circumference line. Note that this positional relationship is reversed when the sheet 11 is captured during double-sided printing.

Further, as shown in FIGS. 4 and 15, the second support shaft 14 is rotatably inserted through the closing plate 57a. In addition, the outer circumferential edge of the closing plate 57a) 107
A reinforcing shaft 107 is tightly fitted into the hole a, and this reinforcing shaft 107 is located closer to the center than the outer peripheral edge of the closing plate 57a. The annular support 57 is rotatably fitted loosely around the outer circumference of the closing plate 57a and rotates about the reversal axis 68 together with the closing plate 57a. These closing plates 57a and the annular support 5
As shown in FIG. 13, the rotation in one direction is prevented by a stopper bolt 103 that has entered from the annular support 57 into a notch 104 of the closing plate 57a.

Further, a protrusion 115 is formed at a position radially opposite to the first gripping claw 15 of the annular support 57, and as shown in FIG. 13 and FIG. 15, respectively, the protrusion 115 is Reinforcement shaft 107 at a position opposite to
A compression spring 106 is mounted between the member 105 and the protrusion 115 of the spring receiver fixed to the spring holder. The spring force of the compression spring 106 prevents the annular support 57 from rotating in the other direction.

As shown in FIGS. 2 and 10, the first gripping claw 15 is located on the outer circumferential side of the transfer sheet 4 during single-sided two-color printing, and its paper capturing surface 15a faces toward the inner circumferential side. Further, a second gripping claw 16 mounted on the second support shaft 14 corresponding to the first gripping claw 15 is located on the inner circumferential side of the transfer device 4 during single-sided two-color printing, and The capture surface 16a faces toward the outer circumference. A cylindrical attachment provided at the rear thereof is supported by the second support shaft 14 by a portion 16b.

Furthermore, regarding the regulation piece 69, the regulation piece 6
Reference numeral 9 is rotatably supported on the left end of the reinforcing shaft 107, and is formed in an oval cam shape. The regulating piece 69 is fixed to the second support shaft 14 and is capable of engaging with a protrusion 02b of the arm 102a, which will be described later.

At the time of single-sided two-color printing, the six regulating pieces are held in the operating position, and the arm 102 is attached by the push spring S.
When the protruding portion 102b of a is brought into contact with the operating circumferential surface of the regulating piece 69, the arm 102a is rotated counterclockwise for installation.
The second gripping claw 16 is rotated in the same direction as the second support shaft 14, and the second gripping claw 16 is
The catching surfaces 16a of the gripping claws 16 are held apart. While the regulating piece 69 is in the suppressing position, the second gripping claw 1
6 is prevented from rotating.

On the other hand, during double-sided printing, by manually holding the regulating piece 69 in the non-operating position, the second support shaft 14 becomes rotatable, and by the rotation of the second gripping claw 16, the catching part 16a of this and the first The gripping claw 15 can come into contact with the catching portion 15a.

Further, as shown in FIG. 10, the body groove 12 of the transfer 4
On one inner wall surface, there is a claw receiver 17 extending throughout the height direction.
is fixed, and the capturing surface 17a located at the outer end in the circumferential direction is located on the same curved surface as the outer peripheral surface of the transfer member 4.

On the rotation trajectory of the capture surface 15a of the first gripping claw 15,
The catching surface 1 of the claw receiver 17 is in a state facing the catching surface 15a.
7a is positioned so that, as shown in FIG. is set to . The catching surface 16a of the second gripping claw 16 and the claw receiver 17 are formed so as not to interfere with each other, and the catching surface 16a of the first gripping claw 15
a is formed to have a width that allows it to come into contact with either of the capturing surfaces 16a, 17a.

Next, the drive mechanism 70 for driving the second gripping claw 16 and gripping the sheet 11 during double-sided printing will be described with reference to FIGS. 1 and 6.

This drive mechanism 70 is arranged on both sides of the right side wall plate 28 of the transfer unit 4. An operating shaft 71 extending parallel to the main shaft 24 is rotatably supported between the left and right wall plates 27 and 28 of the transfer unit 4. An operating shaft 71 is located on the right side of the right side wall plate 28.
A swing lever 72 is fixed to the protruding portion of the swing lever 72, and a cam roller 74 is attached to one end of the swing lever 72 via a roller shaft 73 so that its position can be adjusted.

Further, a cam mounting tube 75 loosely fitted to the main shaft is fixed to the inner surface of the right bearing 23, and control cams 76 for reversal and two-color use each having a different cam surface on its outer peripheral surface.
．． 77 are fixed side by side on the left and right. By adjusting the position of the cam roller 74, these holes H
It is adapted to selectively engage one of the wholesale cams 76 and 77.

A guide rod 79 is rotatably supported at the other end of the swing lever 72 via a pin 78. A wing receiver piece 80 is provided protruding from the right side wall plate 28 of the transfer charge 4,
The other end of the guide rod 79 is loosely inserted into the insertion hole 81 . A pressing spring 83 is wound around the guide rod 79, and the swinging lever 72 is urged to rotate by the spring force thereof, and a predetermined force is applied to the operating shaft 71.

Further, as shown in FIGS. 1 and 6, a swing lever 84 is fixed to the outer peripheral surface of the operating shaft 71 on the left side of the right side wall plate 28, and the other end of the swing lever 84 is fixed to the outer peripheral surface of the operating shaft 71. One end portion of the connecting piece 85 is pivotally supported in the portion. On the left side surface 28 of the right side wall plate 28, near the connecting piece 85, a rotating plate 8G is supported at its center by a shaft 87 so as to be rotatable back and forth.

One end of the rotating plate 86 is rotatably connected to the other end of the connecting piece 85, and the other end is rotatably connected to a movable plate 88 in the form of a long plate.

The movable plate 88 is supported on the right side wall plate 28 by a pin 90 rotatably fitted with a cap 91 chamfered to the same width as the width of the slit 89 extending in the length direction.

A second support shaft 14 is provided on the upper end surface of the movable plate 88.
On the other hand, the mounting is carried out by pressing an attached contact roller 94 via an arm 94a.

When the roller 74 is engaged with the reversing control cam 7G, the swing lever 84 moves according to the cam shape of the control cam 76.
moves back and forth. As a result, the connecting piece 85 and the rotating plate 86
The movable plate 88 reciprocates in the left-right direction in FIG.

Then, when the second support shaft 14 is reversed in accordance with the rotation of the annular support 57 near the contact point between the transfer charge 4 and the supply network 5, the moving plate 88 comes into contact with the contact roller 94, and the second The support shaft 14 of is rotated. As a result, the second gripping pawl 16 rotates counterclockwise to prepare itself for gripping the trailing edge of the sheet 11 on the supply network 5. Then, as it approaches the contact position, the second gripping claw 16 rotates clockwise based on the cam shape of the control cam 76, and the trailing edge of the sheet 11 is gripped.

On the other hand, during single-sided two-color printing, the contact roller 74 is engaged with the two-color control cam 77, and based on the shape of the control cam 77, the contact roller 74 is moved in the vicinity of the contact position of the supply network 5 or the left impression cylinder 2. , the second support shaft 14 is held in a non-rotating state,
The second gripping claw 16 never opens or closes.

Subsequently, when the sheet 11 is reversed as described above, when the sheet 11 is transferred from the transfer charge 4 to the impression cylinder 2, the trailing edge of the sheet 11 touches the catching surface of the second gripping claw 16. Dam prevention mechanism 100 that prevents it from being flipped up by 16a
will be explained according to FIGS. 1 and 7.

The above-mentioned prevention mechanism 100 is provided on the right side of the left side wall plate 27. That is, the swing lever 9 is attached to the operating shaft 71.
5 is fixed, and a connecting piece 9 is attached to one end of the swing lever 95.
6 is rotatably connected. A rotary lever 97 is supported by a shaft 97a on the left side wall plate 27, and one end thereof is rotatable relative to the other end of the connecting piece 96, and the other end thereof is rotatable relative to one end of the connecting rod 98. is connected to. Further, the lower end of a rotation locking piece 99 is supported by a shaft 99a on the right side surface of the left side wall plate 27, and the other end of the rotor l'' 98 is rotatably connected to the center thereof.

When the roller 74 in the drive mechanism 70 is engaged with the reversing control cam 76, the actuating shaft 71, which is reciprocated by the swing lever 72, causes the prevention mechanism 1
00 is swung, and the swiveling locking piece 99 is moved from the normal position shown by the solid line in FIG. It oscillates between the suppressed position shown by the line.

When the swing lever 95 is in the restraining position, the pressing end surface 101 of the rotation locking piece 99 is attached to the second support shaft 14 due to the pressing force received from the contact roller 102 attached via the arm 102a. By preventing the rotational movement of the second support shaft 14, the rotational movement of the second gripping claw 16 is prevented.

Now, the operation of the sheet transfer mechanism in the offset printing machine configured as described above will be explained below.

First, the operation during single-sided two-color printing will be explained. During this single-sided two-color printing, the traveling roller 44 in the reversing mechanism 33 engages with the single-sided two-color cam 48, and furthermore, the cam roller 74 in the drive mechanism 70 engages with the two-color control cam 77, and the regulating piece 69 in the operating position, the gripping surface 15a of the first gripping claw 15 and the gripping surface 1 of the second gripping claw 16
Each part of the transfer 4 is set in advance prior to the start of printing work so that the transfer 4 is maintained in a spaced state from the transfer 4.

As mentioned above, after the supply cylinder 5 receives the sheet 11 already printed in one color from the transport cylinder 3 and rotates half a rotation, the gripping claw 9 gripping the front edge of the sheet 11 Approach Transfer 4. At this time, the second support shaft 14 of the transfer 4
The first support shaft 13 is located on the outer peripheral side, and the first support shaft 13 is located on the inner peripheral side.

Then, due to the action of the regulating piece 69, the second support shaft 14
is held unrotatable, and the binion 64 is rotated by the sector gear 37 of the swinging member 35, which swings based on the cam shape of the operating cam 48 of the reversing mechanism 33.
, the annular support 57 rotates about the reversal axis 68 via the first support shaft 13, the reinforcing shaft 107, and the closing plate 57a, so the first gripping claw 15 in the open state rotates in the closing direction. .

When the gripping claw 9 of the supply cylinder 5 releases the sheet 11, the first gripping claw 15 of the transfer 4 moves as shown in FIG. Rotating in the inner circumferential direction, the catching surface 15a engages with the catching surface 17a of the claw receiver 17 via the front edge of the sheet 11, and both catching surfaces 15a, 17
The front edge of the sheet 11 is clamped by a. As shown in FIG. 2, as the transfer 4 rotates, the sheet 11
is transferred in the direction of the impression cylinder 2.

After that, when the front edge of the sheet 11 reaches the contact point between the transfer 4 and the impression cylinder 2, the annular support 57 rotates according to the shape of the single-sided, two-color cam 48, and accordingly, the 1 gripping claw 15 rotates in the outer circumferential direction of transfer 4. The first gripping claw 15 is then separated from the claw receiver 17, and the leading edge of the sheet 11 is released. At the same time, the gripping claw 19 of the impression cylinder 2
rotates to catch the leading edge of the sheet 11, and the sheet 11 is transferred onto the impression cylinder 2. The sheet 11 is held on the circumferential surface of the impression cylinder 2, and as the impression cylinder 2 rotates, a second color printing is applied by the blank cylinder 1 facing the impression cylinder 2.

Then, as the annular support 57 rotates, the first gripping claw 15 moves toward the outer periphery of the transfer charge 4, and as the transfer charge 4 rotates, it moves again toward the supply cylinder 5, thereby performing the above-described operation. repeat.

During the single-sided two-color printing described above, the second gripping claw 16 is held unrotatable by the regulating piece 69 and does not take part in capturing and gripping the sheet 11. That is, the front edge of the sheet 11 held on the circumferential surface of the supply cylinder 5 is captured by the claw receiver 17 fixed to the transfer member 4 and the left and right bearing members 65.6.
This is done by the first gripping claw 15 which rotates with the rotation of 6 and engages with the claw receiver 17. After capturing the sheet 11, the first gripping claw 15 is held in the closed state until the sheet 11 is transferred from the transfer 4 to the impression cylinder 2.
7 and grips the leading edge of the sheet 11, the sheet 11 is captured and transferred in a stable manner with less shaking.

Next, the operation of the sheet transfer mechanism of this offset printing machine during double-sided printing will be described below.

Prior to double-sided printing, the regulation piece 69 is further deactivated so that the traveling roller 44 of the reversing mechanism 33 engages with the double-sided cam 47 and the cam roller 74 of the drive mechanism 70 also engages with the double-sided control cam 76. Each part of the transfer 4 is set in advance so that it can be held in position and the catching surface 15a of the first gripping claw 15 and the catching surface 16a of the second gripping claw 16 can be brought into close contact with each other.

In the above-mentioned state, the sheet 11 whose surface has been printed on the right impression cylinder 2 by the corresponding blank 1lliil 1 is sent via the transport cylinder 3 onto the circumferential surface of the supply cylinder 5. Thereafter, the sheet 11 is transferred to the transfer charge 4 side as the supply cylinder 5 rotates, and as shown in FIG. While holding it, it passes through the contact point between the supply cylinder 5 and the transfer cylinder 4. Then, the swinging member 35 swings a predetermined amount based on the cam shape of the cam 47 in the reversing mechanism 33 of the transfer 4, and the rotating shaft 61 is rotated by the pinion 64 that meshes with the sector gear 37. The second support shafts 13 and 14 are located on the outer circumferential side and the center side of the transfer member 4, respectively.

The first and second gripping claws 15, 16 each move toward the contact points of the dual-use 4, 5 while remaining closed. When the X-th and second gripping claws 1516 reach the vicinity of the contact point of the dual-use 4.5, the movable plate 88 of the drive mechanism 70 pushes up the contact roller 94 from below, and the second gripping claw 16 moves in the opening direction. is rotated.

Then, by the rotation of the operating shaft 71 according to the cam shape of the cam 76 of the drive mechanism 70 of the transfer 4, the movable plate 88 is moved toward the center of the transfer 4 via the swing lever 84, the connecting piece 85, and the rotation plate 86. The abutting roller 94, which is supported by this pressure, is also displaced toward the center. As a result, the mounting arm 94a is rotated clockwise, and the second gripping claw 16 is rotated toward the center of the transfer 4 by the second support shaft 14 that follows and rotates. After this, when the trailing edge of the sheet 11 held by the picker 10 reaches the contact point between the supply cylinder 5 and the transfer member 4, the suction of the blower is stopped and the operation of the picker 10 is stopped. , the trailing edge of the sheet 11 is released.

Then, the gripping surface 16a of the rotating second gripping claw 16 touches the gripping surface 15 of the first gripping claw 15 via the trailing edge of the sheet 11.
a, and at the contact position of dual use 4 and 5, the sheet 11
The rear edge of is gripped by both gripping claws 15 and 16. At this time, the annular support 57 is held unrotatable on its axis according to the shape of the reversing control cam 47 of the reversing mechanism 33, and the first gripping claw 15 remains on the inner circumferential side of the transfer device 4 and moves to the outer circumferential side. It will not be done. and the first and second support shafts I3.1
4 are urged in the direction of contacting each other by push springs S, and both gripping claws 1516 are held in an engaged state to hold the sheet 1.
1 is maintained in the posture of grasping the object.

After this, as shown in FIG.
rotates according to the shape of the reversing cam 47 of the reversing mechanism 33, and the annular support 57 also moves in the same manner, reversing the first and second gripping claws 15 and 16, while
As the transfer 4 rotates half a turn, it moves to the contact position between it and the left impression cylinder 2.

During this time, the gripping operation of the sheet 11 by both gripping claws 15, 16 is performed only by the biasing force of the push spring S, and these gripping claws 15, 16 hold the sheet 11 face up, and the reversing mechanism It rotates according to the shape of the reversing cam 47 of 33. When the sheet 11 approaches the contact point between the transfer member 4 and the left impression cylinder 2, the first gripping claw 15, which rotates based on the shape of the cam 47, engages with the claw receiver 17. At the same time, the second gripping claw 16 is retracted toward the center of the transfer device 4 based on the operation of the pressing end surface 101 of the rotary locking piece 99 controlled by the control cam 76, and is separated from the first gripping claw 15. and,
At the contact positions of dual use 2 and 4, the cam 4 of the reversing mechanism 33
7, the first gripping pawl 15 is rotated in the opening direction, releases the trailing edge of the sheet 11, and transfers this sheet 11 to the gripping pawl 19 of the impression cylinder 2.

As described above, when the second gripping claw 16 retreats to the center side of the transfer 4, when the operating shaft 71 is rotated according to the shape of the double-sided control cam 76 of the drive mechanism 70 of the transfer 4, In the prevention mechanism 100, the swing lever 95 is displaced to the position shown by the two-dot chain line in FIG. Then, the connecting piece 96, rotating lever 97, and connecting iron 9 of this prevention mechanism 100
8, the rotation locking piece 99 also moves to the position shown by the two-dot chain line, and the pressing end surface 101 of the rotation locking piece 99 moves the abutting roller 10.
2 is pressed.

Then, the second support shaft 14 is rotated counterclockwise via the mounting arm 102a by the pressing force acting on the contact roller 102, and the second gripping claw 16 releases the sheet 11 accordingly. . The pressing end surface 101 of the rotation locking piece 99 is held in a state where it presses the contact roller 102, so that the first gripping claw 15 of the transfer cylinder 4 is held at the contact point between the impression cylinder 2 and the transfer cylinder 4. While releasing the trailing edge of the sheet 11, the second gripping claw 16 interferes with the trailing edge of the sheet 11,
This prevents it from jumping up.

Therefore, when the sheet 11 is transferred from the transfer cylinder 4 to the impression cylinder 2, the gripper claw 19 of the impression cylinder 2 can accurately hold the trailing edge of the sheet 11, and the impression cylinder 2 On the circumferential surface, the sheet 11 is held at a predetermined position and a predetermined attitude,
Printing is performed on the back side by the plan cylinder 1 without misalignment, and extremely high-quality printing can be performed in the same way as when printing in two colors on one side.

Thereafter, the bearing members 65 and 66 of the transfer cylinder 4 and the first and second support shafts 13 and 14 are moved to a predetermined position by the action of the double-sided cam 47 of the reversing mechanism 33 and the reversing control cam 76 of the drive mechanism 70, respectively. Rotate the first and second gripping claws 1
5 and 16 are engaged with each other and move toward the contact position between the transfer cylinder 4 and the supply network 5 as the transfer cylinder 4 rotates. Then, the gripping claws 15 and 16 are separated from each other just before the contact point position to prepare for the capture of the next sheet 11 held on the circumferential surface of the supply network 5.

As mentioned above, the transfer cylinder 4 receives the sheet 1 from the supply network 5.
Immediately before receiving the trailing edge of the transfer cylinder 1, the second support shaft 14 is positioned toward the center of the transfer cylinder 4. As a result, the second gripping claw 16 rotates around the second support shaft 14, and the amount by which the rotation locus protrudes from the outer circle of the transfer cylinder 4 is extremely small.

As a result, the amount of swing of the second gripping shaft 16 is reduced, and the space occupied by the transfer cylinder 4 in the entire printing machine is reduced, making it possible to downsize the entire machine.

In addition, during the above-described double-sided printing, the transfer cylinder 4 receives the sheet 11 from the supply network 5, and while the same sheet 11 is transferred to the left impression cylinder 2 side, the sheet 11 is gripped. , that is, the first
The engagement of the second gripping claws 15 and 16 is not dependent on the control of the cam 47 of the reversing mechanism 33 and the cam 76 of the drive mechanism 70, but is performed by the push spring S.

Therefore, the two cams 47, 76 described above are connected to the annular support 5.
7, and both gripping claws 15, 16.
It is not necessary to have the precision necessary to control the synchronized operation of the Therefore, detailed and complicated work can be avoided when machining the cams 47, 76.

Next, a second embodiment of the invention will be described with reference to FIG. 16.

In this embodiment, the left wall plate 27 and the swinging member 35 are connected by a transmission shaft 110 extending to the right instead of the shaft pin 34, and the right wall plate 28 and the swinging member 35 are connected to each other by a transmission shaft 110 extending to the right. 111 are connected by the transmission shaft 110. And the rotating shaft 6
The pinion 112 fixed to the pinion 2 and the sector gear 113 fixed to the rocking plate 111 are meshed with each other, and the left and right pinions 64, 112 are rotated synchronously via the transmission shaft 110 to provide the first and second support. By applying rotational force to the shaft 13.14 from the left and right sides, the first and second gripping claws 15.16 can be rotated more reliably.

Note that the present invention is not limited to the embodiments described above; for example, (1) a chain-sprocket mechanism or a gear-timing belt mechanism may be adopted in place of various cams and rollers that engage with the cams; (2) Any changes can be made without departing from the spirit of the invention, such as limiting the invention to offset printing machines for single-sided, two-color printing, or adopting the structure of this invention to offset printing machines for multicolor printing, etc., as long as they do not depart from the spirit of the invention. .

[Effect] As detailed above, according to the first and second inventions of the present application, when a sheet of paper is held in a predetermined state on the peripheral surface of the impression cylinder and a plurality of colors are printed on one side, different colors are printed on one side. It prevents duplicate printing and enables high-quality printing, as well as
During double-sided printing, the excellent effect of avoiding wasteful use of printing paper and complicated accompanying work due to unstable paper feeding is exhibited.

[Brief explanation of the drawing]

FIG. 1 is a side cross-sectional view showing the transfer type in the first embodiment of the present invention, FIG. 2 is a front view of the road body showing the state of filter paper passing during single-sided two-color printing, and FIG. Figure 4 is a front view of the road body showing the state of filter paper transfer, Figure 4 is a perspective view showing both support shafts and their support mechanisms, Figure 5 is a front sectional view showing the reversing mechanism, and Figure 6 is a front sectional view showing the drive mechanism. 7 is a front sectional view showing the prevention mechanism, FIG. 8 is a front sectional view showing the reversed state of both claws, FIG. 9 is a front view of the road body showing the reversed state of both claws in order, and FIG. The figure is a front cross-sectional view of the main parts showing both claws and the claw receiver, FIG. 11 is a plan view of the main parts showing both claws and the claw receiver, and FIG.
The figure is a side view showing the regulating piece, Fig. 13 is a side view showing the compression spring provided on the annular support, Fig. 14 is a side view showing the installation state of the push spring that biases both claws, and Fig. 15 is a side view showing the state in which the pressure spring is installed. 16 is an exploded perspective view showing various parts supported by both support shafts, FIG. 16 is a side sectional view showing a second embodiment of the present invention, and FIGS.
Figure 9 shows a conventional example, of which Figures 17 and 1
FIG. 8 is a front view of a road body showing a single-sided multicolor printing method and a double-sided printing method in the conventional example, and FIG. 19 is a front view showing the gripping claw in the same conventional example. Impression cylinder 2, transfer cylinder 5, supply cylinder 5, sheet 11, support shaft 13
．． 14, gripping claws 15 and 16 as sheet gripping members, reversing mechanism 33, support body 57, restriction piece 69 as rotation restriction means, drive mechanism 70° Patent applicant Sakurai Seisakusho Co., Ltd. Agent Patent attorney On 1 ) Hiroshi Nobu 6a

Claims (1)

[Claims] 1. A transfer cylinder (4) disposed between the supply cylinder (5) and the impression cylinder (2), and the transfer cylinder (4) capable of pivoting in the longitudinal direction. A pair of upper and lower sheet gripping members (15) (16) are respectively fixed to a pair of support shafts (13) (14) provided, and these gripping members (1) are
5) A sheet transfer mechanism for an offset printing press capable of single-sided multicolor printing and double-sided printing, comprising: a reversing mechanism (33) for reversing (16) around a reversing axis (68); (33)
and supports both support shafts (13) and (14) parallel to each other, and one gripper is used to capture the sheet (11) on the circumferential surface of the supply cylinder (5) during single-sided printing. Parts (1
5) a rotary support body (57) that rotates only around the reversal axis (68); and a support shaft that supports the other gripping claw (16) when capturing the sheet (11) during double-sided printing. (14) transfer cylinder (
4) a drive mechanism (70) that drives the other gripping claw (16) to open and close by rotating on the center side than the periphery; and reversal of both gripping members (15) and (16) during double-sided printing. A biasing means (S) that biases these gripping members (15) and (16) in a direction to engage each other at times; The supply cylinder (5) is fixed on the rotation trajectory of the gripping member (15) and is engaged with one of the gripping members (15).
An auxiliary gripping member (17) that captures the sheet (11) on the circumferential surface
) A sheet transfer mechanism in an offset printing machine, characterized in that it is provided with: 2. A transfer cylinder (4) disposed between the supply cylinder (5) and the impression cylinder (2), and a pair of support shafts that are rotatable in the longitudinal direction of the transfer cylinder (4). A pair of upper and lower sheet gripping members (15) and (16) are fixed to (13) and (14), respectively, and these gripping members (1
5) A sheet transfer mechanism for an offset printing press capable of single-sided multicolor printing and double-sided printing, comprising: a reversing mechanism (33) for reversing (16) around a reversing axis (68); (33)
and supports both support shafts (13) and (14) parallel to each other, and one gripper is used to capture the sheet (11) on the circumferential surface of the supply cylinder (5) during single-sided printing. Parts (1
5) a rotary support body (57) that rotates only around the reversal axis (68); and a support shaft that supports the other gripping claw (16) when capturing the sheet (11) during double-sided printing. (14) transfer cylinder (
4) a drive mechanism (70) that drives the other gripping claw (16) to open and close by rotating on the center side than the periphery; and reversal of both gripping members (15) and (16) during double-sided printing. A biasing means (S) that biases these gripping members (15) and (16) in a direction to engage each other at times; The supply cylinder (5) is fixed on the rotation trajectory of the gripping member (15) and is engaged with one of the gripping members (15).
An auxiliary gripping member (17) that captures the sheet (11) on the circumferential surface
), and a rotation restriction that prevents rotation of the other gripping member (16) via the other support shaft (14) during single-sided printing, and allows rotation of the other gripping member (16) during double-sided printing. Element(
69) A sheet transfer mechanism in an offset printing press, characterized by comprising: