JPS62169645A - Reversal pawl apparatus of perfecting press - Google Patents

Abstract

PURPOSE:To obtain a reversal pawl apparatus excellent in bite function and registering accuracy, by constituting a pawl member of a combination of the main pawl mounted to one common shaft and the sub-pawl opposed to said main pawl. CONSTITUTION:A pawl member biting paper 51 in cooperation with a pawl seat is constituted of a combination of the main pawl 8 mounted to one common shaft and the sub-pawl 9 opposed to said main pawl 8. At the time of the printing of a single surface, the front edge of the paper 51 is delivered between the main pawl 8 and a receiving part 22 at the opposed contact point with a reversal cylinder 48 while the sub-pawl 9 is kept perfectly stopped and held to a state retracted in a space 27. At the time of the printing of both surfaces, the rear edge of the paper 51 is received by the main pawl 8 and the sub-pawl 9 cooperated with each other. After the paper 51 is reversed upside down by the revolution of both pawls, said paper 51 is bitten by the main pawl 8 and the receiving part 22 without generating registering shift at all. Because the sub-pawl 9 already performed its duties during one feed cycle, said sub-pawl 9 retracts to the space 27.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a sheet-fed rotary printing press capable of single-sided printing/double-sided printing, and particularly to a reversing claw device provided on a reversing cylinder constituting a paper conveying means. .

(Prior art) Sheet-fed rotary printing presses capable of both single-sided printing and double-sided printing print two or more multicolors on one side of paper, or print one or more colors on each of the front and back sides of paper. This double-sided printing machine, which has gained popularity due to its wide range of applications, connects multiple printing units by a paper transport means consisting of a paper feed cylinder, a double-diameter cylinder, and a reversing cylinder. These paper transport means work together to transport the paper and reverse the paper, which is necessary during double-sided printing.

That is, in the case of single-sided printing, the leading edge gripper of the double-diameter cylinder grips the leading edge of the sheet, and causes the leading edge to be gripped by the reversing claw of the reversing cylinder at the point of contact with the reversing cylinder. Then, the reversing claw rotates together with the reversing cylinder while holding the front edge of the paper.
Transfer to the impression cylinder of the following printing unit. However, in the case of double-sided printing, the leading edge gripper of the double-diameter cylinder passes the contact point while holding the paper, and then, when the trailing edge gripper reaches the contact point, the trailing edge of the paper is transferred to the reversing cylinder. The paper is delivered to a reversing claw, and then the reversing claw turns the paper upside down as the reversing cylinder rotates, and then delivers it to the impression cylinder of the subsequent printing unit.

Therefore, the reversing claw device installed on the reversing cylinder has an appropriate adjustment mechanism for single-sided printing/double-sided printing (different from the claw devices for double-diameter cylinders or paper feeding cylinders that only receive and transfer paper), and for single-sided printing/duplex printing. It requires a precise opening/closing operation (closing and releasing) and a paper reversal function during double-sided printing, and requires consideration that is completely different from other claw devices.

Regarding the reversing claw device, U.S. Pat. No. 3,537,391 discloses a technique in which two pairs of pivotable tumbler grippers are provided in close proximity within the reversing barrel. In this conventional technology, when printing on one side, two
Only one tumbler-gripper of the pair is active, the other being completely at rest. However, during double-sided printing, one of the two pairs of tumbler grippers receives the trailing edge of the paper, and while the reversing cylinder is rotating, the other tumbler gripper grips the trailing edge of the paper and transfers it. After the sheet is prepared and reversed as the reversing cylinder rotates, the sheet is delivered to the impression cylinder of the subsequent printing unit.

However, according to this conventional technology, it is necessary to change the paper between two pairs of tumblers and grippers in the reversing cylinder during double-sided printing, which increases the number of times the paper is delivered, resulting in delivery errors. Inconveniences such as a decrease in registration accuracy and a decrease in registration accuracy occur.

Further, in a tumbler gripper in which the claws and the claw seats rotate in pairs, the claw seats are not fixed, so the gripping function is not reliable.

Furthermore, since two pairs of tumbler grippers rotate in the circumferential direction of the reversing cylinder, any error in the stopping position of these tumbler grippers will directly result in paper registration error, which is sensitive to print quality. It will affect.

As other typical prior art related to reversing claw devices, Japanese Patent Publication No. 56-2017 and Japanese Patent Publication No. 50-24642 disclose a device consisting of two interlocking claws that are rotatable about one common axis. something is disclosed. One of these mating pawls functions as a pawl and the other as a pawl seat, and at the same time, during double-sided printing, they rotate around a common axis to reverse the sheet.

However, when this conventional technology is analyzed from the aspect of the gripping function, it is found that when the paper is gripped and released, it is swung by the opening/closing control mechanism individually, so the grip seat of the body that is the receiving/handling partner, etc. The relative position of the product is likely to be distorted, making it difficult to receive/deliver accurately and lack stability in registration accuracy.

In addition, when analyzed from the aspect of biting force, a spring is interposed between the set claws to generate biting force, and the set claws are operated by an opening/closing control mechanism consisting of members such as segment gears against the force of the spring. Because of this structure, the spring cannot be made stronger beyond a certain limit defined by the opening/closing control mechanism, and as a result, the gripping force cannot be set sufficiently large.

Furthermore, printing machines use paper of various thicknesses, and when the paper is particularly thick, discrepancies in the position of the claw in the radial direction of the cylinder with the mating claw device are unavoidable. Due to the leverage, a wavy height difference occurs in the gripping portion of the paper (that is, the edge t), resulting in printing problems such as duplication and poor registration.

In addition, during the reversal operation, the mating claws work together to deliver the paper to the claw device on the mating body, but in order to ensure sufficient positional accuracy of the mating claws, delicate adjustments are necessary. Work is required.

(Summary of the Invention) Examining the problems with the first prior art, that is, the tumbler gripper, in order to avoid increasing the number of paper transfers, it is necessary to use a method like the second prior art with interlocking claws, in which the paper is removed without re-gripping. It is desirable to perform the inversion of .

Furthermore, in order to ensure and stabilize the gripping function, it is desirable to grip the paper by closing the claws against the claw seats fixed to the reversing cylinder even during double-sided printing.

Furthermore, in order to improve registration accuracy, it is desirable that the claw seat, which can serve as a reference for registration, be fixed at a constant position on the reversing cylinder from beginning to end.

When considering the problems of the mating claws in the second conventional technique, first of all, in terms of registration accuracy, it is desirable that the claw seats are fixed as described above.

Further, in order to set the biting force to a large value, it is desirable to urge and press only the claws against the claw seats fixed in position on the reversing cylinder.

Furthermore, drastic measures must be taken to address problems such as inconvenience caused by increased paper thickness and difficulty in finely adjusting the toe position.

SUMMARY OF THE INVENTION Accordingly, a principal object of the present invention is to provide an improved reversing pawl device for a duplex printing press.

Another object of the present invention is to obtain a reversing claw device with excellent biting function.

Another object of the present invention is to obtain a reversing claw device with excellent registration accuracy.

Still another object of the present invention is to obtain a reversing claw device that can apply a large biting force.

In addition, the reversing claw device according to the present invention performs reversing with a simple configuration and does not require troublesome fine adjustment work.

In the reversing pawl device according to the present invention, the pawl seat is formed to be absolutely fixed to the outer periphery of the reversing cylinder.

As its original function, this claw seat not only has a receiving part that cooperates with the claw member to bite the paper, but also has an empty space in which one of the constituent members of the claw member is evacuated. have.

The pawl member that bites the paper in cooperation with the pawl seat is composed of a master pawl attached to one common shaft and a child pawl that faces the master pawl. The master pawl is formed to have a pawl width that can simultaneously cover the receiving portion of the pawl seat and the toe of the child pawl, and is controlled to be swingable and rotatable by a common shaft.

Further, the child pawl, which faces only a portion of the pawl width of the master pawl, is controlled by another control member so as to be able to swing and turn around a common axis. The child pawl cooperates with the master pawl only during double-sided printing, and retreats into the empty space of the pawl seat and does not function at all during single-sided printing.

That is, during single-sided printing, only the main claw cooperates with the claw seat to receive/deliver the leading edge of the paper, and this quantum mold is retracted into the empty space and does not function at all.

However, during double-sided printing, the master pawl and child pawl work together to receive the trailing edge of the paper in the receiving position, rotate as a unit around a common axis, and after reversing the paper, they also cooperate with the receiving part of the pawl seat. Then move to a position where you bite the paper.

Then, the child pawl retreats into the empty space, and the trailing edge of the paper is delivered to the impression cylinder of the subsequent printing unit with the master pawl and the pawl seat holding the trailing edge of the paper.

According to the reversing pawl device for a double-sided printing press according to the present invention, not only is the reversing pawl excellent in its original function, but there is no biting allowance, and the pawl seat is absolutely fixed. Very good biting function, registration accuracy, and biting force. In addition, even if the paper thickness increases, it does not cause wavy height differences.
There is no need for fine adjustment of the toe position. Furthermore, since it is essentially a simple structure, it has the possibility of simplifying the structure of the claw device of the mating body. In conclusion, this device solves all the problems in conventional reversing claw devices at once.

(Embodiments) Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1 is a cross-sectional view of a reversing cylinder equipped with a reversing claw device according to the present invention, Fig. 2 is an enlarged plan view of the main part of Fig. 1, and Fig. 3 is a view taken from the direction of arrow 1 in Fig. 2. The cross-sectional view, Figure 4, is the 2nd
5 is an explanatory diagram showing the operation of the reversing claw device during single-sided printing, and FIG. 6 is an explanatory diagram showing the operation of the reversing claw device during double-sided printing. Figure 7 is an explanatory diagram showing the state in which the master nail is separated from the nail seat, and is cut out at a different cross section from that in Figure 3. Figure 8 is an explanatory diagram showing the state in which the master nail is separated from the nail seat, and Figure 8 is an explanatory diagram showing the state in which the master nail and the child nail are separated during double-sided printing. Fig. 9 is an explanatory cross-sectional view showing a state in which the master claw and the child claw, which are also biting the trailing edge of the paper, have rotated and the main claw is seated on the claw seat. FIG.

In FIG. 1, 1a and 1b indicate side walls of the printing press, and between these side walls 1a and 1b, the main shaft 2 of the reversing cylinder is mounted on a bearing 3a.
, 3b for rotation. On both sides of the main shaft 2 there are shoulders 4a of the reversible cylinder.

4b are attached in pairs and serve as a mounting base for the claw shaft 5 and the child claw control shaft 6. In addition, No.

It goes without saying that the middle portion of the reversing cylinder is largely omitted in the figure.

The pawl shaft 5 is rotatably mounted on the shoulder portion 4a by bearings 7a and 7b.
, 4b, parallel to the main shaft 2, and serves as a common axis for a large number of pawl members made up of a combination of master pawls 8 and child pawls 9.

Further, the child pawl control shaft 6 also has a bearing 10a parallel to the pawl shaft 5.

10b is rotatably installed horizontally between the shoulders 4a and 4b, and serves as a mounting shaft for a control gear 11 for controlling the child pawl 9.

As best shown in FIGS. 2 and 3, the parent claw 8 of the claw members includes a bracket 12 fixed to the claw shaft 5 along a dividing line, and
The main components are a pawl holder 14 rotatably attached to the pawl shaft 5 via a bearing 13, and a main pawl main body 15 fixed to the pawl holder 14. That is, the bracket 12 is integrally fixed to the pawl shaft 5 by bolts 16, and the bracket 12 is sandwiched (see FIG. 2).

) A pawl holder 14 is rotatably attached to the pawl shaft 5 by a bearing 13. A spring 19 is interposed between the guide bolt 17 of the pawl holder 14 and the stopper plate 18 of the bracket 12, and urges the pawl holder 14 in the counterclockwise direction in FIG. 3 (the direction in which the master pawl 8 closes). ing. Note that reference numeral 20 indicates an adjustment screw, which adjusts the gap with the pawl holder 14 to adjust the opening timing of the master pawl 8. The main claw main body 15 may be fixed to the claw holder 14 by a mounting bolt 21, but as best shown in FIG. , is formed in a width that covers not only the receiving portion 22 of the claw seat but also the tip of the child claw 9 at the same time.

As best shown in FIGS. 2 and 4, the sub pawls 9 are rotatably attached to the pawl shaft 5, which is a common shaft, via bushes 23. Although the mounting position is illustrated as being juxtaposed with the main claw 8, it is of course not limited to this. Further, the toe of the child claw 9 faces each other in order to cooperate with the parent nail main body 15, but when viewed from the parent claw main body 15, only a portion of the parent claw main body 15 cooperates with the toe of the child claw 9. The other parts are prepared to cooperate exclusively with the receiving part 22 of the claw seat. A gear portion 24 is also partially formed on the outer periphery of the child pawl 9. This gear portion 24 meshes with the control gear 11 fixed to the sub-claw control shaft 6 with bolts 25. Of course, it is also conceivable to make the sub-claw 9 shown in FIG. 4 more complex, and to divide it into a so-called claw part and a gear part, which mesh with the control gear 11.

The claw seat that bites the paper together with the master claw 8 is shown in FIGS. 2 to 4, but could not be shown in FIG. 1. However, it goes without saying that the claw seat is provided on the reversing cylinder, but in the present invention, as best shown in FIG. In other words, the pawl seat is fixedly disposed as one pawl seat bar member 26 in the longitudinal direction of the outer periphery of the reversing cylinder (in other words, in the axial direction of the reversing cylinder) with bolts or the like (not shown). Furthermore, a very characteristic feature of the present invention is that the pawl seat bar member 26 is not only related to the master pawl 8 but also to the child pawl 9. 26 is
As shown in FIG. 3, not only the receiving part 22 that holds the paper together with the master claw main body 15, but also the child claw 9 as shown in FIG.
It also has a space 27 in which the tip of the blade is evacuated. Therefore, these receiving portions 22 and empty spaces 2T form a pair for one set of master claw 8 and child claw 9, and are located side by side in FIG. 2. Note that the width and depth of the space 2T may be sufficient as long as the child claw 9 is accommodated and evacuated. In addition, the main claw 8, the child claw 9, and the receiving part 22
is subjected to super-hardening treatment, etc., which is sufficient to achieve low functionality.

Next, to explain the operating mechanism of the claw shaft 5, which is a common shaft, in FIG.
8 is fixed, and the cam arm 2 is attached to this arm shaft 28.
One end of 9 is swingably attached via a bearing 30. The cam arm 29 located outside the shoulder portion 4b has a sector gear 31 at its other end, and this sector gear 31 meshes with a pawl shaft gear 33 fixed to the end of the pawl shaft 5 with a key 32. A cam roller 35 attached to a roller shaft 34 causes the cam arm 29 to move in a predetermined manner. In the illustrated state, the cam roller 35 is elastically attached to a cam 36 for single-sided printing by a spring (not shown). being touched. The single-sided printing cam 36 and the double-sided printing cam 3T are fixed to the side wall 1b concentrically with the main shaft 2 of the reversing cylinder, and the printing format can be adjusted by moving the roller shaft 34 of the cam roller 35 in the axial direction. The target cam is switched accordingly.

On the other hand 1. The operating mechanism of the child pawl control shaft 6 will be explained as follows.
What is different from the case of the pawl shaft 5 is that only the cam 38 for double-sided printing is present because the sub-claw 9 is operated only during double-sided printing. On the left side of FIG. 1, an arm shaft 39 is fixed to the shoulder 4a, and one end of a cam arm 41 is swingably attached to the arm shaft 39 via a bearing 40. A sector gear 4 is attached to the other end of the cam arm 41.
2 is provided, and this sector gear 42 meshes with a gear 44 fixed to the end of the sub-claw control shaft 6 with a key 43. The cam arm 41 is also provided with a roller shaft 45, and a cam roller 46 at the end of this roller shaft 45 is connected to the double-sided printing cam 38.
It is elastically contacted by a spring (not shown) so that it can roll on the top. However, since the state shown in FIG. 1 shows one-sided printing, there is no target cam on the cam roller 46, and it is not until the roller shaft 45 is moved in the axial direction during double-sided printing that the two-sided printing cam 38 is activated. Contact. In other words, when printing on one side, the cam arm 41 and the child claw control shaft 6
And the child claw 9 is completely at rest. Note that the double-sided printing cam 38 is also fixed to the side wall 1a concentrically with the main shaft 2.

Next, to explain the operation, FIG. 5 shows the paper receiving/delivery pattern during single-sided printing, and FIG. 6 shows the paper receiving/delivery pattern during double-sided printing. In these drawings, 47 is a double diameter barrel;
Reference numeral 8 indicates a reversing cylinder, and 49 indicates an impression cylinder of a subsequent printing unit, and each layer rotates in the direction of the arrow.

First, when printing on one side, the situation can be said to be extremely simple.
1 is connected to the reversing cylinder 48 at the point of contact with the reversing cylinder 48.
It is delivered between the main claw 8 and the receiving part 22. and,
When the main claw 8 and the receiving part 22 are in the state shown in FIG.
gripper 5 of the impression cylinder 49 at the point of contact with the impression cylinder 49 of the subsequent printing unit.
The paper 51 is handed over to 2. Therefore, in this case, the child claw 9
As shown in Figure 4, it stops completely and its toe reaches the empty space 2.
It remained evacuated during T. Therefore, the operating mechanism related to the child claw 9 does not include a single-sided printing cam, while the operating mechanism related to the master claw 8 includes the one-sided printing cam 36→cam roller 35→roller 41t134, as described above. →Cam arm 29→Sector gear 31 →
The force for operating the master pawl 8 is transmitted in the following order: pawl shaft gear 33 → pawl shaft 5 → bracket 12 → spring 19 → pawl holder 14.

However, during double-sided printing, the cam roller 35 on the main claw 8 side
is moved so as to come into elastic contact with the double-sided printing cam 37, and the cam roller 46 on the side of the sub-claw 9 is also moved so as to come into elastic contact with the double-sided printing cam 38, and accordingly, the movements of the main pawl 8 and the sub-claw 9 become completely different. , that is, the 6th. In the figure, double diameter barrel 4
When the trailing edge gripper 53 of T holds the trailing edge of the paper 51 and comes to the opposite contact point, the master pawl 8 and the minor pawl 9 cooperate (see FIG. 8) to grip the trailing edge. receive. The master pawl 8 and the minor pawl 9 with their rear edges engaged rotate about the pawl shaft 5, which is a common axis, while the reversing cylinder 48 is rotating. Paper 5 by turning
After turning the front and back sides of 1, both claws 8.9 are moved to the receiving part with the parent claw 8 still cooperating with the child claw 9, as shown by the symbol ■ in FIG. 6 and as shown in FIG. Reach the position where you are seated at 22.

Then, the paper 51 will be bitten by the main claw 8 and the receiving part 22 without causing any misregistration. Therefore, since the child pawl 9 has already completed its role during one conveyance cycle, it is retracted into the empty space 27 as shown in FIG. 4. In addition to this, the trailing edge of the paper 51 is
Just as in the case of single-sided printing, the sheet is transferred to the trailing edge gripper 52 of the impression cylinder 49 of the succeeding printing unit while being gripped by the master pawl 8 and the receiving portion 22. Thereafter, the parent claw 8 and the sub-claws 9 that have been at rest rotate in preparation for the next conveyance cycle. Note that the transmission of force in the operating mechanism of the main pawl 8 is only due to the switching of the target cam;
The operating mechanism is also different in the movement form, and the force transmission is from the main claw 8.
This is the same as that of , so the explanation will be omitted.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIG. 1 is a cross-sectional view of a reversing cylinder equipped with a reversing claw device according to the present invention, FIG. 2 is an enlarged plan view of the main part of FIG. 1, and FIG. 2 is a sectional view seen from the arrow 1 direction, and FIG.
5 is an explanatory diagram showing the operation of the reversing claw device during single-sided printing, and FIG. 6 is an explanatory diagram showing the operation of the reversing claw device during double-sided printing. Figure 7 is an explanatory diagram showing the state in which the master nail is separated from the nail seat, and is cut out at a different cross section from that in Figure 3. Figure 8 is an explanatory diagram showing the state in which the master nail is separated from the nail seat, and Figure 8 is an explanatory diagram showing the state in which the master nail and the child nail are separated during double-sided printing. Fig. 9 is an explanatory cross-sectional view showing a state in which the master claw and the child claw, which are also biting the trailing edge of the paper, have rotated and the main claw is seated on the claw seat. FIG. 1a, 1b...Side wall, 2...Main shaft, 4 a-, 4b
... Shoulder part, 5... Claw axis, 6... Sub-claw control axis, 8...
... Main claw, 9... Child claw, 11... Control gear, 12.
...Bracket, 14...Claw holder, 15...Main claw body, 22...Receiving part, 24...Gear part, 2B"
Claw seat part member, 27...vacancy, 28...arm shaft,
29...Cam arm, 31...Sector gear, 33.
... Claw shaft gear, 34 ... Roller shaft, 35 ... Cam roller, 36 ... Cam for single-sided printing, 37.38 ... ° cam for double-sided printing, 39 ... Arm shaft, 41 ...・Cam arm, 42... Sector gear, 44... Gear, 45
...Roller shaft, 46...Cam roller, 47...Double diameter cylinder, 48...Reversing cylinder, 49...Impression cylinder of subsequent printing unit, 50...Leading edge gripper, 51...・Paper, 52...Gripper.

Claims (1)

[Claims] 1. Receive the leading edge or trailing edge of the paper from the leading edge gripper or trailing edge gripper of the double-diameter cylinder constituting the paper conveying means, and carry the paper as it is or by inverting it with the rotation of the reversing cylinder and following it. A reversing pawl device for a double-sided printing machine to be delivered to a printing unit, which has a single seat fixed to the outer periphery of a reversing cylinder, and the pawl seat, together with a pawl member, has a receiving part for gripping the paper, and a space for evacuation. The claw member is constructed by a combination of a master claw attached to one common shaft and a child claw facing the main claw, and the main claw connects the receiving part of the claw seat and the tip of the child claw. The nail width is formed to cover the width of the parent nail at the same time, and the nail width is controlled by a common axis. 2. In the reversing claw device according to claim 1,
The claw seat is formed as a single claw seat bar member fixed to the outer periphery of the reversing cylinder, and the claw seat bar member is provided with a receiving portion and a cavity in pairs. 3. In the reversing claw device according to claim 1,
The claw holder and child claw that constitute the parent claw are juxtaposed on a common axis,
The main claw body fixed to the claw holder is extended to a width that covers the tip of the child claw. 4. In the reversing claw device according to claim 1,
A gear portion is formed on the outer periphery of the sub-claw and meshes with a control gear of a sub-claw control shaft provided parallel to the common shaft.