JPH03143634A - Sheet printer - Google Patents

Abstract

PURPOSE:To provide a sheet printer having short overall length and composed of a small number of components and capable of performing multicolor printing by a method wherein the title sheet printer is composed of a printing cylinder on which a plurality of plate surfaces are arranged, an impression cylinder which abuts against the printing cylinder and is rotated in synchronization therewith, and a claw mechanism holding a sheet material. CONSTITUTION:A paper 1 held with a claw part provided to an impression cylinder 5 is wound around the impression cylinder 5, and enters between a rubber cylinder 6 and the impression cylinder 5. Printing ink is transferred onto a first transfer surface 6a of the rubber cylinder 6 and first stage printing is performed. The impression cylinder 5 is further rotated holding the paper 1 as it is, and the paper 1 passes between a second transfer surface 6b of the rubber cylinder 6 and the impression cylinder 5. The printing ink is transferred onto the second transfer surface 6b, and second stage printing is performed. Then, two color printing is completed. Since the claw mechanism holds a sheet material as it is until the claw mechanism passes a plurality of plate surfaces, multicolor printing can be achieved with one impression cylinder.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a sheet-fed printing press.

[Prior Art] FIG. 6 is a front view of essential parts of a conventional sheet-fed printing press that performs two-color printing. In FIG. 6, impression cylinders 605 and 705 having the same outer diameter are provided in contact with the outer periphery of the delivery cylinder 610, which is provided to rotate freely once. Rubber cylinders 606 and 706 having an outer diameter equal to the outer diameter of the cylinders are provided so as to be in contact with each other. Further, on the outer periphery of the blanket cylinders 606 and 706, a plate I1. ! 607,
707 are provided so as to be in contact with each other. The plate cylinders 607, 707 are each provided with a dampening device 608, 708 and an inking device 609, 709. Here, ink units R1609 and R709 can supply inks of different colors.

A paper feeding device 604 is provided near the impression cylinder 605 on the right side, and a supply conveyor 603 extends in a direction away from the paper feeding device 604 with respect to the pressure 1r 1605. Paper 601 is stocked near the far end of the supply conveyor 603, and a sucker 602, only a part of which is shown, is provided for the stocked paper 601. It is adapted to be placed on a supply conveyor 603.

The outer periphery of the left impression cylinder 705 is in contact with a paper discharge cylinder 611 , and a conveyor 612 extends from the paper discharge cylinder 611 .

The operation of the conventional sheet-fed printing press shown in FIG. 6 will be explained. The stocked paper 601 is placed on the conveyance surface of a supply conveyor 603 by a suction machine 602, and is conveyed by the supply conveyor 603 to a paper feed device 604 near an impression cylinder 605. The paper feeding device 604 is linked with the impression cylinder 605, and periodically feeds the paper 601 to the impression cylinder 605, and further feeds the paper 601 to the impression cylinder 605 using a claw (not shown) provided on the impression cylinder 605 or the paper feeding device 604.
It is designed to hold one end of the sent waste paper 601 in its mouth in cooperation with the user.

As the impression cylinder 605 rotates, the held paper 601 is rotated by the impression cylinder 6.
It is wound around the outer circumference of rubber cylinder 606 and impression cylinder 605.
invade m. The blanket cylinder 606 contains printing ink or plate cylinder 60.
7, so this printing ink or paper 601
The first stage of printing is performed by adhering to the substrate.

When the first stage of printing is completed, the paper 601 is transferred to the receiving M cylinder 6.
Passed to 10. Furthermore, the paper 601 has a pressure of 1p170 on the left side.
5, the printed surface is further stamped 1 in the same manner as the impression cylinder 605 described above, and a second stage of printing is performed.

The paper 601 detached from the impression cylinder 705 is discharged as IJ-1611.
The stock is transported by the transport conveyor 612 via the transport conveyor 612 and moved to a new stocking location.

By making the colors of the above-described I-stage printing and second-stage printing different, two-color printing becomes possible. Further, although the above-mentioned configuration is for two-color printing, by connecting similar configurations in series, multi-color printing of the connected number becomes possible.

[Problem to be solved] However, in the above-mentioned sheet-fed printing press, in order to achieve printing in two or more colors, the fE114 etc. and the delivery cylinder must be arranged side by side in the longitudinal direction of the machine. , the total length of the entire device becomes longer, and the installation location is restricted. Additionally, conventional configurations require a large number of cylinders, which increases cost.

SUMMARY OF THE INVENTION An object of the present invention is to provide a sheet-fed printing press that can perform multicolor printing despite having a short overall length and a small number of printers.

[Means for Achieving the Object] A sheet-fed printing press according to the present invention includes a printing mechanism including a printing cylinder having a plurality of plate surfaces on its outer periphery; It consists of a pressure 114 that contacts the outer periphery and rotates 11 times against the printing cylinder, and a claw mechanism that is provided on the outer periphery of the fEIF 4 and grips the sheet material to be printed. While being pressed against the impression cylinder and the printing cylinder, the stamp Jii
The sheet material remains gripped until it passes through the plurality of plate surfaces of l IN.

[Function] According to the sheet printing press of the present invention, the diameter of the impression cylinder is different from the diameter of the printing cylinder, and the resetting claw mechanism does not move the printing cylinder until it passes through the plurality of plate surfaces of the printing cylinder. Since the sheet material remains gripped, by changing the color of the ink on each of the plurality of plate surfaces, multicolor printing can be achieved while the sheet material is gripped by one impression cylinder. The number of components of the printing press can be reduced and the overall length of the printing press can be shortened.

〔Example] Hereinafter, the present invention will be described in detail with reference to Examples.

FIG. 1 is an iE side view of the main parts of a sheet-fed printing press according to the present invention.

In FIG. 1, frames and the like are omitted. In FIG. 1, the outer circumferential surface of the pressure Tl 45 provided on the left side of the four-wheel rotation is composed of a first-wound surface 5a and a non-wound surface 5b. A rubber cylinder 6 is provided in parallel so as to come into contact with the outer periphery of the pressure JPI 5. The outer diameter of the rubber cylinder 6 is pressure IP!
It is twice as many as 5. The outer circumferential surface of the blanket cylinder 6 is composed of a first transfer surface 6a and a second transfer surface 6b, which have the same circumferential length, and non-transfer surfaces 6c and 6d, which also have the same circumferential length. Note that the impression cylinder 5 is configured to rotate at twice the rotational speed of the blanket cylinder 6.

Further, a plate cylinder 7 having an outer diameter equal to the outer diameter of the blanket cylinder 6 is provided in parallel so as to be in contact with the outer periphery of the blanket cylinder 6.
The outer peripheral surface of 7 has a first plate surface 7a and a second plate surface 7a having the same printing layer.
It is composed of a printing plate 7b and non-printing printing plates 7c and 7d, which also have the same circumference.

Note that the circumferential length of the winding surface, printing surface, and transfer surface is all the same, and when the impression cylinder 5, printing cylinder 7, and rubber ff46 rotate, the first winding surface 5a is the first. The first transfer surface 6a is aligned with the second transfer surface 6b, and the first transfer surface 6a is aligned with the first transfer surface 6a.
The outer periphery of the zero plate cylinder 7, which is aligned only with the plate surface 7a and the second transfer surface 6b is aligned only with the second plate surface 7b, is coated with moisture! AAs22 ink systems'? 19.19 is provided. The in+ devices 9 and 19 are adapted to supply ink of different colors. The inking device 9 moves the coating I rollers 9a and 9b up and down relative to the outer periphery of the printing cylinder 7 in synchronization with the rotation of the printing cylinder 7 by means of a cam mechanism (not shown).
Ink is applied only onto the first plate surface 7a. Inking device 1
9 applies ink only to the second plate surface 7b. Both the dampening device and the inking device are well known in the art and their detailed construction will not be described below.

A paper feeder 4 equipped with a stopper 4a for controlling the supply of paper l is provided near the impression cylinder 5 on the right side, and a supply conveyor 3 extends in a direction away from the paper feeder 4 with respect to the impression cylinder 5. ing. One sheet of paper 1 is stocked near the far end of the supply conveyor 3, and on top of the stocked paper 1 there is a suction 4I!, only a portion of which is shown. 2 is provided, and the paper l is sucked up by the wicking machine 2.
so that it can be placed on the supply conveyor 3. Note that the paper feeding device 4 operates to supply paper l to the winding surface 5a in synchronization with the rotation of the impression cylinder 5 (in this embodiment, only one sheet every two rotations of the impression cylinder 5). It is a thing,
Since its structure is well known, it will not be described hereafter.

The operation of the sheet-fed printing press of this embodiment shown in FIG. 1 will be explained. The stocked paper 1 is placed on a supply conveyor 3 by a suction machine 2, and conveyed by the supply conveyor 3 to a paper feeder 4 near an impression cylinder 5. The paper feeding device 4 is linked with the impression cylinder 5, and periodically feeds the paper l to the impression cylinder 5, and further feeds the paper l to the impression cylinder 5 through a pawl (not shown in the i7) provided on the impression cylinder 5 or the paper feeding device 4. At the same time, they hold one end of the sent waste paper in their mouths.

As the impression cylinder 5 rotates, the held paper 1 is wound around the outer periphery of the impression cylinder 5 and enters between the blanket cylinder 6 and the impression cylinder 5. Rubber cylinder 6
The first transfer roller 6a is filled with printing ink or the first plate surface 7 of the plate cylinder 7.
Since the ink has been transferred from a, this printing ink adheres to the paper l and the first stage printing is performed.

At the end of the first stage of printing, the impression cylinder 5 has made almost one revolution, while the rubber copper 6 has only made half a revolution.

At this time, the impression cylinder 5 rotates further while holding the paper l in the claws of the impression cylinder 5, so that the paper l is transferred to the second transfer surface 6b of the blanket cylinder 6.
and the impression cylinder 5. Printing ink is transferred from the second plate surface 7b of the plate cylinder 7 to the second transfer surface 6b of the blanket cylinder 6, and this printing ink adheres to the paper 1 to perform the second stage of printing, resulting in two-color printing. Complete.

After the second stage of printing is completed, one sheet of paper 1 is released from the claw of pressure IPg5, conveyed by conveyor 12 via sheet discharge cylinder 11, and moved to a new stocking location.

By the way, the sheet-fed printing press according to the present invention has a multi-color printing function as described above, and also enables efficient single-color printing by simple operation without changing the component parts. This embodiment has the configuration shown below, and the configuration will be explained first.

FIG. 2 is a sectional view of the paper feeding device 4 having a switching mechanism. This switching mechanism is described in Japanese Patent Application No. 59-170.
No. 365 discloses this in detail.

In FIG. 2, an impression cylinder 5 is rotatably supported by a frame 201, and a camshaft 203 is also rotatably supported in parallel to the impression W45. A gear 20 is mounted on the camshaft 203.
8.214 is rotatably attached to the camshaft 203 by key connection.

A clutch shaft 204 is similarly rotatably supported between the impression cylinder 5 and the camshaft 203.

Gears 209 and 213 are mounted on the clutch shaft 204 in a loose fit with respect to the camshaft. The gear 209 meshes with the gear 208, and the number of teeth of the gear 209 is the same as that of the gear 208.
This is twice the number of teeth. Also, the gear 213 is the gear 2
14, and the number of teeth of the gear 213 is the same as the number of teeth of the gear 214. The impression cylinder 5 and the clutch shaft 204 are connected to each other by gears 205 and 206 having the same number of teeth, and both rotate at the same number of rotations.

A clutch device 207 is provided between the gears 209213 on the clutch shaft 204 so as to be movable in the axial direction and immovable in the rotational direction. The clutch device 207 is provided with two pairs of teeth facing each other in the axial direction, and is moved by a driving force from a driving device (not shown). One tooth of the clutch device 207 is adapted to engage with a complementary tooth provided on the gear 209, and the other tooth of the clutch device M2O7 is adapted to engage a complementary tooth provided on the gear 213. In other words, the axial movement selectively rotates either gear together with the clutch shaft 204.

A pulley 210 is connected to the camshaft 203 so as not to be relatively rotatable, and a chain 211 is wound around the pulley 210. The chain 211 drives the paper feeding device shown in FIG. 1 in the -E direction. Also, the camshaft 203 drives the stopper 4a, and the stopper 4a rises once every time the pulley 210 rotates once, and passes one sheet of paper l each time it rises. It has become.

The operation of this switching mechanism will be explained. When the clutch device 207 is moved in the axial direction by a driving force from a drive device (not shown), and the teeth of the force engage with the teeth of the gear 209, the gear 209 is integrated with the clutch shaft 204 and rotates together. become. In this state, the clutch @204 rotates at a ratio of 1:1 to the impression cylinder 5, or the clutch shaft 204 and the camshaft 203 rotate with the gears 209 and 203.
Due to the meshing with 8, it rotates at a ratio of 2:l. Namely.

Every time the pressure lI 45 rotates twice, the pulley 210 rotates once, thereby feeding the paper 1 to the stopper 4a once.

Next, when a driving force (not shown) is applied in the opposite direction, the other teeth of the clutch device 207 are moved to engage with the teeth of the gear 213, and this time the gear 213 or the clutch shaft 204 is moved. They become unified and begin to rotate. In this state, the clutch shaft 204 and the camshaft 203 are power-coupled via gears 213 and 214, and are
It is designed to rotate. That is, each time the impression cylinder 5 rotates once, the pulley 210 rotates once, thereby feeding the paper 1 to the stopper 4a once.

3 and 4 are views showing the pawl opening/closing mechanism provided on the impression cylinder 5, with FIG. 3 being a partial side view thereof, and FIG. 4 being a partial front view thereof. In FIG. 3, an arm 5f for driving a claw 5C is provided near the outer periphery of the side surface of the impression cylinder 5, and a roller 5e is rotatably supported at the tip of the arm 5f.

In FIG. 4, the arm 5f is attached to the end of a drive shaft 5d that passes through the impression cylinder 5 four times. Claws 5c are attached to the drive shaft 5d at equal intervals, and as the drive shaft 5d swings, they open and close against the outer periphery of the impression cylinder 5 to hold the paper 1 against the outer periphery of the impression cylinder 5 and to prevent it from leaving the impression cylinder 5. or allow it.

A rod 302 extends movably in the axial direction from the frame 201 on the side of the impression cylinder 5, and a cam 301 is attached to the end of the rod 302 on the impression cylinder 5 side. The shape is as shown in FIG. 3, with both ends 301a
, 301b and an outer circumference 301c. A receiving portion 303 is provided at the other end of the lot 302 relative to the cam 301 in FIG.
is accepted. The drive arm 304 is connected to a drive mechanism (not shown), and the drive mechanism swings to move the rod 302 between the cam engagement position 51A and the cam non-engagement position Zi.
It is designed to be moved to either B.

When the rod 302 is in the cam engagement position A, the cam 3
01 corresponds to the rotational position of the impression cylinder 5.
It will engage with the roller 5e of f. When the rod 302 is in the cam disengagement position B, the cam 301 is in the impression cylinder 5
Even if it rotates, it does not engage with the roller 5e of the pawl drive arm 5f. By appropriately controlling a drive mechanism (not shown), the rod 302 is maintained at the cam engagement position at all times, and is alternately driven between the cam engagement position MA and the cam non-engagement position B every rotation. You can also.

In the state of cam engagement position A, as shown in FIG.
When the claw 5c is away from the cam 301, the claw 5c is always urged in the closing direction by a spring (not shown). As the impression cylinder 5 rotates, the roller 5e engages with the end 301a of the cam 301, swings the arm 5f and the drive shaft 5d, starts opening the claw 5c, and releases the paper l currently held in the grip. Do it like this. The paper l separated from the impression cylinder 5 is transferred to the paper discharge cylinder 11
The stock is transported by the transport conveyor 12 via the storage area and moved to a new stocking location. Fourth, the roller 5e rolls on the outer periphery 301c of the cam 301, and when the roller 5e reaches the end 301b, the claw 5c begins to close, and in synchronization with this, new paper l is supplied, so the claw 5C closes. Can hold a piece of paper in his/her mouth properly.

When the sheet-fed printing press shown in FIG. 1 is equipped with the paper feeding device with the switching device shown in FIG. 2 and the claw ijJ mechanism shown in FIGS. The setting is such that one sheet of paper l is fed per rotation, and the rod 302, which is a pawl drive mechanism as shown in Fig. 3.4, is moved to the cam locking position ff1 every rotation.
By setting the cam to be driven alternately between A and the cam non-engaging position B, the two-color printing shown in the first embodiment is possible.
(You can obtain a configuration that does this.

On the other hand, the paper feeding device shown in Fig. 2 is set to feed one sheet of paper per one revolution of the impression cylinder 5, and the pawl drive mechanism shown in Fig. 3.4 is set to the loft 302 or always in the cam engagement position. By setting filA to be maintained at filA and supplying ink of the same color from ink unit 79.19, blanket cylinder 6 or 1 rotation (
Two sheets of paper are printed each time the impression cylinder 5 rotates twice (2 rotations), resulting in a configuration that enables efficient monochrome printing.

Figure S5 shows yet another embodiment of the impression cylinder.

The difference from the impression cylinder 5 shown in FIG. 1 is that the impression cylinder 505 shown in FIG.
has a diameter 1.5 times that of the rubber cylinder 6, and is further provided with three wrapping surfaces 505a, 505b, and 505c on the outer periphery. In the embodiment shown in FIG. 5 as well, the impression cylinder 5
During two rotations of the impression cylinder, the claws keep holding the paper in their mouths, so that the paper on each winding surface passes through the transfer surfaces 6a and 6b, respectively, and two of the three sheets of paper are transferred during two rotations of the impression cylinder. Color printing is possible.

Although the present invention has been described in detail with reference to examples,
The present invention should not be construed as limited to the above embodiments,
It goes without saying that changes and improvements can be made as appropriate.

For example, the number of inking devices in the embodiment shown in FIG. If it is held around the impression cylinder for three rotations of the impression cylinder, a three-color sheet-fed printing machine can be obtained. In this way, printing with as many colors as space permits, ie, multicolor printing, can be obtained.

[Effects of the Invention] As described above, according to the present invention, according to the sheet-fed printing press of the present invention, the diameter of the impression cylinder is different from the diameter of the printing cylinder, and the claw mechanism or the plurality of plate surfaces of the printing cylinder Since the sheet material remains gripped until it passes through the printing cylinder, multicolor printing can be achieved while it is gripped by one impression cylinder by changing the ink color of each of the plurality of printing plates. This allows the number of components of the printing press to be reduced and the overall length of the printing press to be shortened. In addition, in conventional multicolor printing machines, printing misalignment occurred due to changing the paper in the mouth.According to the present invention, multicolor printing can be performed without changing the paper in the mouth. This eliminates misalignment and improves printing accuracy.

[Brief explanation of the drawing]

FIG. 1 is a front view of essential parts of a sheet-fed printing press according to the present invention. FIG. 2 is a sectional view of the paper feeding device 4 having a switching mechanism. 3 and 4 are views showing the pawl opening/closing mechanism provided on the impression cylinder 5, with FIG. 3 being a partial side view thereof, and FIG. 4 being a partial front view thereof. FIG. 5 shows yet another embodiment of the impression cylinder. FIG. 6 is a front view of main parts of a conventional sheet-fed printing press capable of two-color printing. [Explanation of symbols of main parts] 4...Paper feeder 5...Impression cylinder 6...Blank cylinder 7...Plate cylinder 9.19...・Ink Equipment Hana 1st Ward Me 2 people

Claims (1)

[Scope of Claims] 1. A printing mechanism including a printing cylinder having a plurality of plate surfaces on its outer periphery; a printing mechanism having an outer diameter different from that of the printing cylinder, abutting against the outer periphery of the printing cylinder, and synchronous with the printing cylinder; It consists of an impression cylinder that rotates and a claw mechanism that is provided on the outer periphery of the impression cylinder and that grips the sheet material to be printed. A sheet-fed printing machine that keeps gripping the sheet material while being pressed against it until it passes through the plurality of plate surfaces of the printing cylinder. 2. When the diameter of the printing cylinder is A and the diameter of the impression cylinder is B, the relationship A=B・n (n is an integer of 2 or more) holds, and the printing cylinder can handle n printing plates. 2. A sheet-fed printing press according to claim 1, further comprising: a pawl mechanism that continues to grip the sheet material during n rotations of the impression cylinder. 3. The printing cylinder has an even number of M plate surfaces, the impression cylinder has an odd number of N claw mechanisms, (M and N are integers of 1 or more), and the diameter of the printing cylinder is A. and when the diameter of the impression cylinder is B, the relationship A:B=M:N holds, and the claw mechanism remains gripping the sheet material while the impression cylinder rotates M. A sheet-fed printing press according to claim 1. 4. The pawl mechanism includes: a pawl portion provided on the outer periphery of the impression cylinder and configured to rotate together with the impression cylinder and grip the sheet material; a follower attached to the pawl portion; and a follower attached to the pawl portion; a cam provided on the cylinder and adapted to engage the follower when the impression cylinder rotates; and a cam that is moved in the direction of the rotational axis of the impression cylinder to separate the cam and the follower. and a separation means that selectively takes a position where the cam and the follower are engaged, and an engagement position where the cam and the follower are engaged, and when the separation means is in the engagement position, the cam opens and closes the pawl. When the separation means is in the separation position, the cam is always out of engagement with the follower, and the separation means remains in the engagement position only once for every multiple rotations of the impression cylinder. 2. The sheet-fed printing press according to claim 1.