JPH021022B2 - - 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, a sheet-fed rotary printing press with a reversing mechanism that can be used for single-sided printing and double-sided printing has been developed and put into practical use. 1 and 2 are 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, and FIG. The figure 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. After the reversing cylinder 2 rotates approximately 180 degrees, it is gripped again by the claw 7 of the impression cylinder 3 and the next printing is performed, but in this case, the paper 5 wound around the impression cylinder 3 is Similarly, since the front surface 5a is exposed upward, single-sided printing is performed. On the other hand, in the case of double-sided printing shown in FIG. When the trailing edge of the paper reaches the point of contact between the cylinders 1 and 2, the trailing edge of the paper is picked up by the reversing claw 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 the front and back sides reversed, and the front surface 5a is turned downward by the gripping of the pawl, and the paper 5 is pressed. Wrapped around body 3, back side 5
Printing is applied to b, resulting in double-sided printing. in this case,
Unlike in 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. A cam surface for reversing the pawl is provided on the opening/closing cam of the reversing pawl 8 so that it can rotate approximately 180 degrees.

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. It is freely rotatable around the trunk axis. 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, the conventional phase adjustment device
Each gear was fixed with four to six bolts and a restraining plate, and each time the phase was adjusted, these were individually loosened and tightened with a torque wrench to release and fix the gears. In order to avoid being one-sided, you must repeatedly tighten all the bolts a little at a time, such as tightening one bolt a little, then the next bolt a little. Not only does it take a long time to adjust, but it also requires a large space for adjustment.
Another drawback was that the operability was extremely poor.

The present invention has been made in view of the above points, and includes a fixed gear that meshes with a gear on the downstream printing cylinder fixed to the end shaft of the reversing cylinder whose peripheral surface is in contact with both adjacent printing cylinders. , a pair of worms on a worm shaft mounted in the diametrical direction close to the outer end surface of the fixed gear; Four worm wheels rotatably supported by screw members are engaged with the outer end surface of the fixed gear on both sides of each worm, and each screw member is provided with a presser plate facing the outer periphery of the end surface of the adjustment gear. By rotating all the screw members simultaneously through the worm wheel and connecting/disconnecting the fixed gear and the adjusting gear through the presser plate, the reversing cylinder and its upstream impression cylinder are The present invention provides a phase adjustment device for a sheet-fed rotary printing press with a reversing mechanism, which allows phase adjustment to be performed in a short time with a simple configuration and easy operation from one location. Embodiments of the present invention will be described in detail below with reference to the drawings.

3 to 7 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. 5 is a front view of FIG. 3. BB sectional view, FIG. 6 is a CC sectional view of FIG. 4, and FIG. 7 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 with reference to FIGS. 1 and 2. In these figures, the left and right frames 1 of each adjacent printing unit
0, blanket cylinders 4 and 6 as printing cylinders and impression cylinders 1 and 3 of double diameter are supported pivotably with their circumferential surfaces facing each other, and between both impression cylinders 1 and 3 there is a A double-diameter reversing cylinder 2 is pivotally supported on each impression cylinder 1 and 3 with its peripheral surface facing each other, and between both impression cylinders 1 and 3, the reversing cylinder 2 is attached to each impression cylinder 1 and 3. It is pivotally supported by the frame 10 with its peripheral surfaces facing each other. The outer circumferential notches of the impression cylinders 1 and 3 have a cam follower on the cylinder side opposed to a pawl opening/closing cam fixed to the frame side at the end of the cylinder shaft, and the cylinders 1 and 3 rotate at a predetermined timing. A plurality of claws 7 and 9 are respectively provided to open and close. In addition, in the outer peripheral notch of the reversing cylinder 2,
Multiple cams that open, close, and reverse by selectively bringing the cam follower on the barrel side into contact with either the claw opening/closing cam for single-sided printing or the claw opening/closing/reversing cam for double-sided printing, which are also fixed to the frame side at the end of the barrel shaft. The reversing claws 8 are provided.

On the end shaft 11 of the reversing cylinder 2 which protrudes from the frame 10 on the opposite side of the drive 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. , and 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. is rotatably fitted. And fixed gear 1
2 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.
This includes a fixing mechanism (not shown) that fixes the fixed gear 12 to the frame 10 side so that it does not rotate during phase adjustment, and a fixed gear 12 and adjustment gear 1 during single-sided printing.
A fixing mechanism (not shown) is attached for fixing 4.

Therefore, the configuration of the phase adjustment device will be explained. Three bearings 15, 16,
A worm shaft 18 is rotatably supported on bearings 15 and 16, and a worm shaft 18 is rotatably supported on bearings 15 and 16. ing. Further, an operating shaft 19 having a hexagonal head is rotatably supported on the bearing 17 with movement in the axial direction restricted by collars 20 and 21, and this operating shaft 19 and the worm shaft 18 are Bevel gears 22 and 23 that mesh with each other are respectively pivotally attached to the . Further, a pair of worms 24 and 25 are pivotally attached to the worm shaft 18 at symmetrical positions on both sides of the shaft core of the fixed gear 12, and the worm shaft 18 is rotated in the axial direction by its own stepped portion and the worm 24. movement is regulated. On the other hand, fixed gear 1
2, pins 26 each having a hexagonal head are inserted into four places on the outer periphery of the pin 26. The pins 26 are slidably but non-rotatably fixed to a restraining plate 27, which will be described later, with a notch. Head and fixed gear 1
2 and the end surfaces of the adjustment gear 14, a fan-shaped restraining plate 27 is inserted with its arc-shaped finished surface pressed against the end surfaces of both the gears 12 and 14. The protruding portion of each pin 26 from the fixed gear 12 is threaded, and a worm wheel 28 that meshes with each of the worms 24 and 25 on both sides thereof is screwed into this threaded portion. By rotating the shaft 18, the four worm wheels 28 rotate synchronously, and the pin 26 advances and retreats, and the fixed gear 12 and the adjusting gear 14 are crimped and fixed via the restraining plate 27. It is configured to

Such a phase adjustment device is equipped with an operating section shown in FIG. 7 as a whole by reference numeral 29. That is, a bearing 31 is provided diagonally below both gears 12 and 14 and is supported by being connected to the frame 10 by four stays 30. A small gear 34 that meshes with the adjustment gear 14 and a gear shaft 35 are integrally formed and rotatably supported on the attached ball bearing 33. Furthermore, a handle shaft 36 is connected to the frame 1 between the upper and lower stays 30.
A pinion 38 on the handle shaft 36 and a gear 39 on the gear shaft 35 are engaged with each other. Handle shaft 36
A handle 40 is attached to the handle 40, and
Two annular grooves 41 and 42 are provided, and together with a ball 44 biased by a spring 43, a click mechanism is formed to control the movement of the handle shaft 36.
It is configured to be regulated by an engaged position and a non-engaged position of the pinion 38, which are shown by solid lines and chain lines in the figure. By doing this, the pinion 38 and gear 3
9 and rotate the handle 40, 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 adjusting gear 14 are fixed in a predetermined phase by a fixing mechanism (not shown), and the worm wheel 28 is closed, and the adjusting gear 14 is crimped and fixed to the fixed gear 12 via the restraining plate 27. ing. Further, the cam follower on the other end side of the reversing cylinder 2 corresponds to a claw opening/closing cam for single-sided printing, and the handle shaft 36 is connected to the frame 10.
The pinion 38 and gear 39 have been disengaged from each other. The handle shaft 36 is provided with a safety device such as a limit switch so that the machine will not start unless the handle shaft 36 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 printing.

Next, when switching from single-sided printing to double-sided printing,
After releasing the fixation of both gears 12 and 14 by a fixing mechanism (not shown), when the hexagonal head of the operating shaft 19 is rotated with a wrench, the four worm wheels are connected via the bevel gears 22 and 23 and the worms 24 and 25. 2
8 rotate at the same time and come out of the threaded portion of the pin 26, and the pin 26 becomes slightly movable in the axial direction, so that the fixed gear 12 and the adjusting 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 36 is pushed and the pinion 38
When the handle 40 is rotated with the gear 39 engaged, the adjustment gear 1 is rotated due to the engagement between the pinion 38 and the gear 39, and the engagement between the small gear 36 and the adjustment gear 14.
4 rotates, and the phases of the fixed gear 12 and the adjustment gear 14 are 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 positioning in this way, when the operating shaft 19 is rotated in the opposite direction, the bevel gears 22 and 23 and the worm 2
The worm wheel 28 connects to the pin 26 via 4 and 25.
By being tightened, both gears 12 and 14 are crimped and fixed via the restraining plate 27. Thereafter, the fixed gear 12 is released from the frame 10, the handle shaft 36 is moved, and the pinion 38 and gear 39 are disengaged, thereby completing the phase adjustment.

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.

In addition, when assembling, the worm 24,
25 and the worm wheel 28 so that they do not come apart, tighten the four pins 26 evenly with a torque wrench, and then tighten the pins 26 and the retainer 2.
Do this in the order of hitting the notch between the 7 and the 7.

As is clear from the above description, according to the present invention, in a sheet-fed rotary printing press with a reversing mechanism, the downstream printing cylinder and the end shaft of the reversing cylinder whose peripheral surfaces are in contact with both adjacent printing cylinders A fixed gear that meshes with the fixed gear is fixed, and an adjustment gear that meshes with the gear of the printing cylinder on the upstream side is loosely mounted on the outer circumferential stepped part of the fixed gear. The upper worm and four worm wheels rotatably supported by screw members on the outer end surface of the fixed gear are engaged with each other on both sides of each worm, and each screw member is attached to the outer periphery of the end surface of the adjustment gear. By providing a holding plate facing the front and configuring it so that the rotation of the worm moves all screw members forward and backward at the same time via the worm wheel to connect and disconnect the crimped fixation between the fixed gear and the adjustment gear via the holding plate. The configuration allows the phase adjustment between the reversing cylinder and the upstream impression cylinder to be performed centrally by operating at one location.
Adjustment time is significantly shortened, making it possible to respond to higher machine speeds, and each part of both gears is evenly crimped without using a torque wrench, allowing for secure fixation with easy operation that does not require skill. Since it is a worm type, the force is expanded even if all parts are crimped with one operation, and the operability is very good.

[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. 7 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 BB sectional view, FIG. 6 is a CC sectional view of FIG. 4, and FIG. 7 is a sectional view of the phase adjustment operation section. 1, 3...Impression cylinder, 2...Reversing cylinder, 11...End shaft, 12...Fixed gear, 12a...Step part, 14...
...Adjustment gear, 18... Worm shaft, 19... Operation axis, 22, 23... Bevel gear, 24, 25...
Worm, 26...Pin, 27...Press plate, 28
...Warm foil.

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; A worm shaft that is close to the end face and is mounted in the diametrical direction and is driven by a rotating means, and a pair of worms that are integrally provided on the worm shaft at approximately symmetrical positions on both sides of the fixed gear shaft core. , two pairs of worm foils that are rotatably supported on the outer end surface of the fixed gear by screw members and mesh with each of the worms on both sides; and presser plates that are respectively provided on the screw members and face the outer periphery of the end surface of the adjustment gear. A sheet-fed rotary printing machine with a reversing mechanism, characterized in that the screw member advances and retreats as the worm rotates, and the fixed gear and the adjusting gear are crimped and connected via the presser plate. Phase adjustment device.