JPH021020B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for adjusting the phase between cylinders that transfer paper in a sheet-fed rotary printing press equipped with a paper reversing mechanism for double-sided printing.

In recent years, with the diversification of printing, sheet-fed rotary printing presses with a reversing mechanism that can be used for single-sided printing and double-sided printing have been developed and put into practical use. 1st
Figures 1 and 2 show side views of the vicinity of the reversing cylinder to explain the paper transfer operation during single-sided printing and double-sided printing with this type of printing machine. This shows the case of double-sided printing. To explain this based on the figure, a reversing cylinder 2 is provided downstream of the impression cylinder 1 of the first printing unit, and an impression cylinder 3 of the second printing unit is provided downstream of the reversing cylinder 2.
is provided. The printed paper 5 is then moved between the impression cylinder 1 and the blanket cylinder 4 of the first printing unit.
By changing the grip of the claws, the paper is sent through the reversing cylinder 2 to between the impression cylinder 3 and the blanket cylinder 6 of the second printing unit, and the next printing is performed. Therefore, when comparing single-sided printing and double-sided printing, firstly, in the single-sided printing shown in FIG. was put in the mouth,
After the reversing cylinder 2 has rotated approximately 180 degrees, the claw 9 of the impression cylinder 3
The paper 5 is then placed in the mouth and the next printing is performed, but in this case, since the surface 5a of the paper 5 wound around the impression cylinder 3 is also exposed upward, single-sided printing is performed. On the other hand, in the case of double-sided printing shown in FIG.
The paper is wrapped around the impression cylinder 1 past the point of contact with the reversing cylinder 2 while being held in the claw 7, and when the trailing edge of the paper reaches the point of contact between both cylinders 1 and 2, the trailing edge of the paper is wrapped around the reversing claw. It is replaced by 8. At this time, the pawl 7 opens and releases the paper 5, so as the reversing cylinder 2 rotates, the paper 5 reaches the impression cylinder 3 with its front and back sides reversed, and as the pawl changes its grip, the surface 5a becomes downward and the paper 5 is pressed. It is wrapped around the cylinder 3 and printed on the back side 5b, resulting in double-sided printing. In this case, unlike the case of single-sided printing, the reversing claw 8 enters the paper 5 from the tail side, grips it, and releases the paper 5 after revolving together with the reversing cylinder 2, so the reversing claw 8 Reversing claw 8 to rotate approximately 180 degrees during revolution
The opening/closing cam is provided with a cam surface for reversing the pawl.

In the printing cylinder device equipped with a reversing mechanism that operates in this manner, as is clear from a comparison between FIG. 1 and FIG. 2, the claws 7 facing each other in FIG.
In FIG. 2, the winding angle θ of the paper 5 and the rotation angle α of the reversing claw 8 are out of phase with each other. Therefore, when switching from single-sided printing to double-sided printing or from double-sided printing to single-sided printing, the cylinder group downstream of this including the reversing cylinder 2 and the cylinder group upstream of this including the impression cylinder 1. It is necessary to shift the phase by an angle θ corresponding to the size of the paper 5 and a rotation angle α of the reversing claw 8. This phase adjustment must also be performed when the paper size changes during duplex printing.

Conventionally, the following types of devices have been used as this phase adjustment device. That is, two gears on the reversing cylinder 2, which mesh with the gear on the impression cylinder 1 to transmit rotation, are installed adjacently, one gear is fixed to the reversing cylinder shaft, and the other gear is fixed to the reversing cylinder shaft. Loosely fits around the shaft so that it can rotate freely. During operation, the two gears are fixed to transmit the rotation of the impression cylinder 1 side, and in the case of phase adjustment, the two gears are unlocked and the idle gear is connected to the cylinder group on the impression cylinder 1 side. After positioning by rotating the two gears together, the two gears are fixed and the rotation is transmitted.

However, in conventional phase adjustment devices, two gears are fixed with four to six bolts and a restraining plate, and each time the phase is adjusted, these are loosened or tightened to release and fix the gears. Therefore, it not only takes a long time for adjustment, but also requires a large space for adjustment, and has the drawbacks of extremely poor operability.

The present invention has been made in view of the above points, and a fixed gear that meshes with a gear on the downstream printing cylinder is fixed to the end shaft of the reversing cylinder whose peripheral surface is in contact with both adjacent printing cylinders. Then, an adjustment gear that meshes with the gear on the upstream printing cylinder is installed on the stepped part, and
A threaded pinion gear screwed into the shaft end surface of the reversing cylinder so that it can move forward and backward, and a plurality of gears supported by screw members at locations that divide the outer periphery of the end surface of the fixed gear approximately equally in the circumferential direction are connected directly or In addition to meshing through an intermediate gear, each screw member is provided with a retaining plate facing the outer periphery of the end face of the adjusting gear, and the screw members are moved forward and backward by rotation of the pinion gear to connect the fixed gear and the adjusting gear via the retaining plate. A sheet-fed rotary printing press with a reversing mechanism that enables phase adjustment between the reversing cylinder and its upstream impression cylinder with a simple configuration and easy operation by configuring the crimping and fixing of the reversing cylinder to be connected and disconnected. A regulating device is provided. Embodiments of the present invention will be described in detail below with reference to the drawings.

3 to 6 show an embodiment of the phase adjustment device according to the present invention, FIG. 3 is a sectional view thereof, FIG. 4 is a front view from A in FIG. 3, and FIG. BB sectional view, FIG. 6 is a sectional view of the phase adjustment operation section.
The arrangement of the cylinders around the reversing cylinder, the reversing operation of the paper, etc. will be explained using FIGS. 1 and 2. In these figures, on the left and right frames 10 of each adjacent printing unit, blanket cylinders 4 and 6 as printing cylinders and impression cylinders 1 and 3 of double diameter thereof are supported pivotably with their peripheral surfaces facing each other. Between both the impression cylinders 1 and 3, a reversing cylinder 2 having a double diameter is pivotally supported with its circumferential surface facing each impression cylinder 1 and 3.
3, an inversion cylinder 2 is pivotally supported by a frame 10 with its peripheral surface facing each impression cylinder 1, 3. Impression cylinder 1,
In the outer circumferential notch of No. 3, there are a plurality of cam followers that open and close at predetermined timings as the cylinders 1 and 3 rotate, with the cam follower on the cylinder side facing the pawl opening/closing cam fixed to the frame side at the end of the cylinder shaft. claws 7 and 9 are provided, respectively. In addition, in the outer peripheral notch of the reversing cylinder 2, a reversing cylinder can be selectively connected to either a claw opening/closing cam for single-sided printing or a claw opening/closing/reversing cam for double-sided printing, which is also fixed to the frame side at the end of the cylinder shaft. A plurality of reversing claws 8 are provided that open, close, and reverse by bringing the side cam followers into contact with each other.

On the end shaft 11 of the reversing cylinder 2 that protrudes from the frame 10 on the side opposite to the driving side of the reversing claw 8 by the cam, there is a fixed gear 12 that meshes with a gear fixed to the shaft end of the impression cylinder 3 on the downstream side. It is fixed with a fixing bolt 13, and a step 12a formed on the outer circumference of the fixed gear 12 has an annular adjustment gear 14 that meshes with a gear fixed to the shaft end of the impression cylinder 1 on the upstream side. It is fitted so that it can rotate freely. The fixed gear 12 and the adjustment gear 14 are configured so that their mutual phases can be adjusted by a phase adjustment device, which will be described later, when switching between single-sided printing and double-sided printing. A fixing mechanism (not shown) fixes the fixed gear 12 to the frame 10 so that it does not rotate, and a fixing mechanism (not shown) fixes the fixed gear 12 and the adjustment gear 14 during single-sided printing.

Therefore, the configuration of the phase adjustment device will be explained. A stepped gear hole 15 is bored in the center of the fixed gear 12, and a pinion gear 16 is rotatably supported in the gear hole 15. This pinion gear 16 includes a gear portion 16a and an outer hexagonal head 16.
b and a pin 16c fitted into the gear hole 15, and by screwing a bolt 18 into the end face threaded hole of the pin 16c via a washer 17, it can be rotated freely relative to the fixed gear 12. In addition, movement in the axial direction is restricted. The gear portion 16a is provided with a spanner hole 19 into which a box spanner for attaching and detaching the fixing bolt 13 is inserted. On the other hand, pins 20 each having a hexagonal head are slidably but non-rotatably inserted into the positions dividing the outer circumferential portion of the end face of the fixed gear 12 into four equal parts in the circumferential direction, and the pins 20 are fixed with the heads. Gear 12 and adjustment gear 14
A fan-shaped holding plate 2 is provided between the end face of the
1 is inserted with its arc-shaped finished surface pressed against the end surfaces of both gears 12 and 14. The protruding portion of each pin 20 from the fixed gear 12 is threaded, and a gear 22 that meshes with the pinion gear 16 is screwed into this threaded portion to rotate the pinion gear 16. As a result, the four gears 22 rotate synchronously, the pin 20 advances and retreats, and the fixed gear 12 and the adjustment gear 14 are crimped and fixed via the restraining plate 21.

Such a phase adjustment device is provided with an operating section, which is shown in FIG. That is, a bearing 25 is provided diagonally below both gears 12 and 14 and is supported by being connected to the frame 10 by four stays 24. A small gear 28 that meshes with the adjustment gear 14 and a gear shaft 29 are integrally formed and rotatably supported on the attached ball bearing 27. Furthermore, a handle shaft 30 is connected to the frame 1 between the upper and lower stays 24.
The handle shaft 30 is rotatably supported by a bearing 25 and a bracket 31 fixed to the bearing 25, and a pinion 32 on the handle shaft 30 and a gear 33 on the gear shaft 29 are meshed with each other. A handle 34 is attached to the handle shaft 30, and
Two annular grooves 35 and 36 are provided, and together with a ball 38 biased by a spring 37, a click mechanism is formed to control the movement of the handle shaft 30.
The pinion 32 is configured to be regulated by an engaged position and a non-engaged position, which are shown by solid lines and chain lines in the figure. By doing this, the pinion 32 and gear 3
3 and rotate the handle 34, the adjustment gear 14 rotates and the phase with the fixed gear 12 is adjusted. Note that the stepped end face of the fixed gear 12 and the corresponding end face of the adjusting gear 14 are as follows:
A pointer and scale plate (not shown) are provided to display a phase adjustment device corresponding to the size of the paper 5.

The operation of the printing cylinder device and phase adjustment device configured as above will be explained. First, in the case of single-sided printing,
The fixed gear 12 and the adjustment gear 14 are fixed in a predetermined phase by a fixing mechanism (not shown), and the gear 22 is closed and the restraining plate 21 is fixed.
The adjustment gear 14 is crimped and fixed to the fixed gear 12 via. In addition, the cam follower on the other end side of the reversing cylinder 2 corresponds to the claw opening/closing cam for single-sided printing, and the handle shaft 30 has been pulled out from the frame 10 and the pinion 32 and gear 33 are disengaged. There is. The handle shaft 30 is provided with a safety device such as a limit switch so that the machine will not start unless the handle shaft 30 is pulled out.

When the machine is operated in this state, as shown in FIG. It is then wound around the reversing cylinder 2, and is changed between the reversing claws 8 and 9 and wound around the impression cylinder 3 with the surface 5a facing upward.
Printing is applied to a, making it a single-sided print.

Next, when switching to double-sided printing, after releasing the fixation of both gears 12 and 14 by the fixing mechanism (not shown), apply a wrench to the hexagonal head 16b of the pinion gear 16 and rotate it. The two gears 22 rotate simultaneously and come out of the threaded portion of the pin 20, and the pin 20 becomes slightly movable in the axial direction, so that the fixed gear 12 and the adjustment gear 14 are no longer crimped. Therefore, after fixing the fixed gear 12 to the frame 10 side using a fixing mechanism (not shown) to prevent it from moving, the handle shaft 30 is pushed and the pinion 3
2 and the gear 33 and rotate the handle 34, the pinion 32, the gear 33, and the small gear 28
The adjustment gear 14 rotates due to the meshing between the fixed gear 12 and the adjustment gear 14, and the phase between the fixed gear 12 and the adjustment gear 14 is adjusted. During this adjustment, since the position of the end of the paper 5 varies depending on the size of the paper 5 and the angle θ shown in FIG. After this positioning, when the pinion gear 16 is rotated in the opposite direction, the gear 22 that meshes with the pinion gear 16 is tightened onto the pin 20, whereby both gears 12 and 14 are crimped and fixed via the restraining plate 21. After that, the fixed gear 12 is released from the frame 10 side, the handle shaft 30 is moved, and the pinion 32 and gear 33 are removed.
The phase adjustment is completed by releasing the mesh.

When the machine is operated in this state, the phase adjustment causes the upstream cylinder group including the impression cylinder 1 to be out of phase with respect to the cylinder group including the reversing cylinder 2, and the cam follower at the other end of the reversing cylinder 2 Since it corresponds to the pawl opening/closing/reversing cam for double-sided printing, the surface 5a between the blanket cylinder 4 and the impression cylinder 1 is
The paper 5, which has been printed on, is wrapped around the impression cylinder 1 by an angle θ past the point of contact between the two cylinders 1 and 2, and the tail end of the paper is gripped by the reversing claw 8 at this position. As the cylinder group further rotates, the paper 5 is reversed so that the front surface 5a is on the inside, and reaches the point of contact with the impression cylinder 3, where it is gripped by the claw 9 of the impression cylinder 3, so that the back side faces up and the paper 5 is pressed. Printing is performed on the back side between the cylinder 3 and the blanket cylinder 6, resulting in double-sided printing.

7 and 8 show other embodiments of the present invention, FIG. 7 is a developed sectional view corresponding to FIG. 3, and FIG. 8 is a front view corresponding to FIG. 4. It is. In this embodiment, the pinion gear 16A has a smaller diameter than the pinion gear 16 of the previous embodiment,
Two intermediate gears 39 are provided between the pinion gear 16A and the four gears 22A on the pin 20, each meshing with the pinion gear 16A and the two gears 22A. The rest is the same as the previous embodiment. By doing this, pinion gear 1
The rotation of 6A is transmitted to gear 22A via intermediate gear 39 to perform phase adjustment. It goes without saying that when the screw directions are the same, the rotation direction of the pinion gear 16 when crimping both the gears 12 and 14 is opposite.

FIG. 9 is a cross-sectional view of a crimped portion between a fixed gear and an adjustment gear showing another embodiment of the present invention. An adjustment gear 14A is freely mounted on a stepped portion formed on the outer side of the adjustment gear 14A. The planetary gear 22B, which meshes with the pinion gear of the reversing cylinder shaft core, is supported by a bolt 40 that is screwed into the end face of the fixed gear 12A so that it can move forward and backward. That is, the hexagonal hole 41 provided in the gear 22B engages with the hexagonal head 42 provided in the bolt 40, and a presser plate 43 is inserted between the gear 22B and the adjustment gear 14A. Also gear 2
2B is prevented from coming off from the bolt 40 by a threaded bolt 44 and a washer 45. The rest is the same as each of the above embodiments. By doing this, when the gear 22B is rotated by the rotation of the pinion gear 16, the bolt 4 engaged with the gear 22B at the hexagonal head 42 is rotated.
0 rotates to advance and retreat with respect to the fixed gear 12A, and the adjustment gear 14A is crimped and fixed to the fixed gear 12A via the presser plate 43.

The order of assembly of the devices shown in each of the above embodiments is as follows:
First, tighten the gears 22, 22A, and 22B to a predetermined torque using a torque wrench, then move the pinion gear 16 or the intermediate gear 39 in the axial direction without rotating it, engage it, and tighten the nut on the back side so that it will not come off. Do it like this. Each gear 16, 39, 22
Both gears are in 1 even if there is a considerable drop in the
The influence on the crimp fixation of Nos. 2 and 14 can be almost ignored.

As is clear from the above description, according to the present invention, in the phase adjustment device of a sheet-fed rotary printing press with a reversing mechanism, the downstream side A fixed gear that meshes with the printing cylinder on the upstream side is fixed, and an adjustment gear that meshes with the gear on the upstream printing cylinder is freely mounted on the outer peripheral stepped part of the fixed gear, and
A threaded pinion gear screwed into the shaft end surface of the reversing cylinder so that it can move forward and backward, and a plurality of gears supported in a planetary manner by screw members on the outer periphery of the end surface of the fixed gear are meshed directly or through intermediate gears. , each screw member is provided with a presser plate facing the outer periphery of the end face of the adjustment gear, and the rotation of the pinion gear moves the screw member forward and backward to connect and disconnect the fixed gear and the adjustment gear through the presser plate. With this configuration, the phases of the cylinder group on the downstream side including the reversing cylinder and the upstream cylinder group including the printing cylinder on the upstream side can be adjusted extremely easily and in a short time by concentrated operation from the axis of the reversing cylinder. This greatly improves operability and productivity, reduces the operating space, and allows the machine to be configured more compactly.

[Brief explanation of drawings]

FIGS. 1 and 2 are side views of the vicinity of the reversing cylinder in a sheet-fed rotary printing press with a reversing mechanism for comparing and explaining the paper gripping operation in single-sided printing and double-sided printing, and FIGS. FIG. 9 shows an embodiment of the phase adjustment device for a sheet-fed rotary printing press with a reversing mechanism according to the present invention, FIG. 3 is a sectional view thereof, FIG. 4 is a front view from A in FIG. 3, and FIG. FIG. 3 is a sectional view along BB, FIG. 6 is a sectional view of the phase adjustment operation part, and FIGS. 7 and 8 show other embodiments of the present invention.
FIG. 8 is a front view corresponding to FIG. 4, and FIG. 9 is a cross-sectional view of a crimped portion between a fixed gear and an adjusting gear, showing another embodiment of the present invention. It is a diagram. 1, 3...Impression cylinder, 2...Reversing cylinder, 5...Paper, 12,1
2A...Fixed gear, 12a...Step part, 14, 14A...
Adjustment gear, 16...pinion gear, 20...pin, 2
1, 43... Presser plate, 22, 22A, 22B... Gear, 39... Intermediate gear, 40... Bolt.

Claims (1)

[Claims] 1. In a sheet-fed rotary printing press with a reversing mechanism in which paper is reversed between the two printing cylinders by a reversing cylinder whose peripheral surface is in contact with both adjacent printing cylinders, the sheet-fed rotary printing press is fixed to the end shaft of the reversing cylinder and is connected to the downstream side. a fixed gear that meshes with a gear on the printing cylinder on the side; an adjustment gear that is loosely mounted on a stepped portion adjacent to the fixed gear and meshes with a gear on the printing cylinder on the upstream side; and an axis of the reversing cylinder. A threaded pinion gear is screwed into the end face so that it can move forward and backward; comprising a plurality of gears that mesh with each other via an intermediate gear, and a presser plate that is provided on each of the screw members and faces the outer periphery of the end face of the adjustment gear,
A phase adjustment device for a sheet-fed rotary printing press with a reversing mechanism, characterized in that the screw member advances and retreats as the pinion gear rotates, and the fixed gear and the adjusting gear are crimped and fixed via the presser plate. .