JPH0415509Y2 - - Google Patents

Description

[Detailed description of the invention] (1) Technical field This invention is a paper ejecting device for a printing press, in particular a device that prevents ejected printing paper from rolling up on the plate cylinder and securely strips it from the plate cylinder. It is related to.

(2) Prior art This type of paper ejecting device is designed so that the tip of a peeling claw on the paper ejection side of the plate cylinder and press roller is inserted into the gap between the plate cylinder and the leading edge of the printing paper, so that the paper adheres to the plate cylinder. There is a device that peels off the printed paper.

By the way, printing paper usually has a portion (leading edge margin) where printing is not performed, and this portion serves as a non-adhesive portion that does not adhere to the plate cylinder. Therefore,
Using this non-adhesive part, the printing paper can be peeled off from the plate cylinder with the tip of the peeling claw, but in this case, if the printing on the printing paper is a line (line image), there will be less ink transfer. Peeling off is possible without any problem, but for example, if there is a solid image in the center of the leading edge of the printing paper, the gap between the plate cylinder and the leading edge of the printing paper (non-adhesive area) becomes very small, making it difficult for the peeling claw to remove the image. There was a drawback that the leading edge could not be fully inserted and the printing paper rotated with the printing paper attached to the plate cylinder, so-called curling, which resulted in paper ejection errors.

(3) Purpose This invention eliminates the drawbacks of the conventional methods described above, completely prevents the curling up of the printing paper, allows the printing paper to be reliably peeled off from the plate cylinder, and eliminates paper ejection errors. The purpose is to provide a paper device.

(4) Structure In order to achieve the above object, the paper discharge device of this invention has a peeling claw provided on the paper discharge side of the plate cylinder and press roller, at the tip of which is close to the plate cylinder. It is characterized by being provided with an air outlet that blows air into the gap between the leading edge of the printing paper and the plate cylinder to peel off the printing paper from the plate cylinder.

Hereinafter, one embodiment of this invention will be specifically described with reference to the drawings.

In Figs. 1 to 4, reference numeral 1 denotes a cylindrical plate cylinder having a porous structure, and has a clamp 2 for attaching a base paper on its outer periphery. The plate cylinder 1 is supported via a rotating shaft 3 and rotated in the direction of the arrow by a drive device (not shown). Inside the plate cylinder 1, the outer peripheral surface is the plate cylinder 1.
An ink supply roller 4 that contacts the inner peripheral surface of the ink supply roller 4 and a doctor roller 5 that has a predetermined minute gap with respect to the outer peripheral surface of the ink supply roller 4 are arranged, and the ink supply roller 4 is rotationally driven in the direction of the arrow. As a result, the ink in the ink reservoir 6 is supplied to the inner peripheral surface of the plate cylinder 1.

A press roller 7 is provided on the lower outer periphery of the plate cylinder 1 at a position facing the ink supply roller 4 so as to be movable toward and away from the ink supply roller 4 . The press roller 7 is rotatably supported by a lever 9 via a pivot 8, and the lever 9 is supported by a pivot 10.
It is pivotally supported to the machine frame (not shown) via. The press roller 7 is located at an upper position where it presses the printing paper 12 conveyed between the press roller 7 and the plate cylinder 1 against the outer peripheral surface of the plate cylinder 1, and in order to avoid collision with the clamp 2 provided on the plate cylinder 1. It is designed to intermittently swing about a pivot 10 between a lower position away from the plate cylinder 1 and a lower position in synchronization with the rotation of the plate cylinder 1.

Reference numeral 11 denotes a paper feed tray on which a large number of printing papers 12 are stacked, and the paper feed tray 11 can be raised and lowered by a drive member (not shown) so as to rise as the number of stacked printing papers 12 decreases. A wall plate 13 is fixed in front of the paper feed tray 11 and serves to regulate the front end position of the printing paper 12 placed on the paper feed tray 11. Above the paper feed table 11 is a paper feed roller 1.
4 and a calling roller 15 are connected and rotatably provided. Both rollers 14, 15
is made of a material with a relatively large coefficient of friction such as rubber, and is driven to rotate in the direction of the arrow each time a sheet of printing paper 12 is sent out by a drive member (not shown), and works together with separation roller 16 to move the printing paper onto paper feed table 11. The printing paper sheets 12 can be fed out one by one starting from the topmost one.

A registration roller device is provided closer to the plate cylinder 1 than the paper feed roller 14. The registration roller device has a registration drive roller 17 and a registration driven roller 18, and these rollers 17 and 18 start rotating in synchronization with the rotation of the plate cylinder 1 when the plate cylinder 1 is in a predetermined rotation phase. , the printing paper 12 fed by the paper feed roller 14 is fed between the plate cylinder 1 and the press roller 7. A printing paper detection finger 19 is supported in the registration roller device so as to be able to swing around a pivot shaft 20, and when the registration driving roller 17 and the registration driven roller 18 grip the printing paper 12 and send it out,
The detection finger 19 is adapted to swing downward slightly with a low resistance at the leading end of the printing paper 12.

On the paper discharge side of the plate cylinder 1 opposite to the registration roller device, there is a printing paper 12 attached to the plate cylinder 1.
A peeling claw 21 is provided for peeling off the plate from the plate cylinder 1. The peeling claw 21 is supported by a pivot shaft 22 whose drive is transmitted in synchronization with the swinging of the lever 9, and at the same time as the press roller 7 is pressed against the outer circumferential surface of the plate cylinder 1, its tip end touches the outer circumferential surface of the plate cylinder 1. It is becoming closer to . An air outlet 23 is provided at the tip of the peeling claw 21, and the air outlet 23 communicates with the air supply hose 25 through a communication path 24.
The air supply hose 25 is connected to a compressed air supply source (not shown). The air supply hose 25 is provided with an on-off valve (not shown), which is opened by a control device (not shown) at the same time as the transfer process to supply air continuously or intermittently. When the printing paper 12 peeled off by the spraying is detected by a detector 28 such as an optical sensor provided in the suction conveyance section 27, the suction conveyance section 27 is closed and controlled to stop the supply of air.

The suction conveyance section 27 is constructed by several endless belts 30 being wound around a plurality of support rollers 31, and suction boxes 32 being arranged in a portion surrounded by the endless belts 30. The support roller 31 is rotationally driven by a drive member (not shown). Further, the upper opening of the suction box 32 is formed as an air intake port 33.

The swinging mechanism of the press roller 7 is shown in FIG. 36 is a pressure release arm, and the pivot 10
It is fixed to and is arranged to be able to swing around a pivot 10. A cam follower 3 is attached to the pressure release arm 36.
7 is pivotally supported, and the cam follower 37 is connected to a cam shaft 38.
The cam shaft 38 is pressed by the urging force of the spring 40 against the cam 39 attached to the
is rotated in synchronization with the rotation of the plate cylinder 1, thereby causing the pressure release arm 36 that abuts against the cam 39 and the cam follower 37 to swing around the pivot shaft 10. Reference numeral 42 denotes a paper detection stopper, which is fixed to a pivot shaft 20 which is rotated by the paper detection finger 19, and is swingable around the pivot shaft 20. A hook-shaped hook portion 42a is provided at one end of the paper detection stopper 42, and the hook portion 42a is a hook formed in a notch in the pressure release arm 36 when the cam follower 37 abuts against the maximum diameter portion 39a of the cam 39. It is adapted to be removably engaged with the shaped hook portion 36a. Paper detection stopper 42
A weight 43 is provided at the other end to constantly bias one end of the stopper 42 upward. A pressure release stopper 44 is fixed to a pivot shaft 45 below the paper detection stopper 42 and is arranged to be able to swing around the pivot shaft 45 . Pressure release stopper 44
A hook-shaped hook portion 44a is provided at one end of the
The hook portion 44a has the cam follower 37 connected to the cam 39.
The pressure release arm 36 is removably engaged with a hook-shaped hook portion 36b formed in a notch in the pressure release arm 36 in a state where it abuts against the maximum diameter portion 39a of the pressure release arm 36. A spring 46 is disposed at the other end of the pressure release stopper 44 to constantly bias one end of the stopper 44 upward, and the one end is provided with a spring 46 that springs one end of the stopper 44 by its suction action. The hook portion 44a swings downward against the urging force of the hook portion 36.
A solenoid 47 is provided to separate the valve from b.

As shown in FIG. 2, the plate cylinder 1 consists of a metal support cylinder 1a and a screen 1b wrapped around the outer periphery of the support cylinder 1a. The screen 1b is made by spinning Tetoron fibers into approximately 100 to 200 meshes. As shown in Fig. 6, the support cylinder 1a is made by etching a thin metal plate made of stainless steel or the like with a thickness of about 0.1 to 0.2 mm.
It is manufactured by cutting a large number of small holes of about 0.5 mm and rounding it into a cylindrical shape using a cylindrical plastic processing machine with multiple rollers. Reference numeral 50 denotes an ink passage area, and the area 50 has pores of about 20 to 60 meshes. Reference numerals 51 and 52 denote a pair of left and right flanges attached to both ends of the support cylinder 1a, and are fixed with screws 54 using small holes 53 provided at both ends of the cylinder 1a. At this time, the opposing ends 55 and 56 of the cylindrical body 1a are exposed to the ink supply roller 4 when the plate cylinder 1 rotates forward (left clockwise).
5 and 56 are overlapped in such a direction that the corner portions of the end faces do not collide.

When the support cylinder 1a is manufactured as described above, it is inexpensive, easy to manufacture, easy to remove, and also prevents ink leakage.

Next, the passage and transfer of ink from the cylindrical body 1a to the printing paper 12 by the pressing force of the press roller 7 will be explained with reference to FIG.

The peripheral speed of the outer peripheral surface of the ink supply roller 4 is
Since the speed is set to be lower than the circumferential speed of the inner circumferential surface of the ink supply roller 4, the ink is rubbed into the small holes in the ink passage area 50 of the cylindrical body 1a constituting the plate cylinder 1. After that, it passes through the small hole and is supplied to the back side of the stencil paper 58. That is, the ink supplied from the supply roller 4 to the inner peripheral surface of the cylindrical body 1a is supplied to the screen 1b through the small holes of the cylindrical body 1a as shown in a, and passes through the screen 1b to the back surface of the base paper 58. Supplied. At the perforated portion of the base paper 58, the ink further passes through the holes of the base paper 58 as shown in b from the screen 1b and is transferred to the surface of the printing paper 12, forming a printed image.

In the above, the ink supplied to the screen 1b cannot pass through the base paper 58 at the unperforated end of the base paper 58, and is gradually moved to the right in FIG. 7 by the pressing force of the press roller 7. There is a risk of being pushed out. However, as shown in FIG. 3, the axial length L ₁ of the ink passage area 50 of the support cylinder 1a is
_{The supply roller} An ink passage area 50 is also provided in the support cylinder 1a further outside the contact end with the support cylinder 1 of 4, and the small holes in this area 50 are utilized as shown in FIG. The excess ink is then pushed back into the support cylinder 1a by the pressing force of the press roller 7, as shown in C in the figure. Therefore, the ink leakage phenomenon does not occur.

Further, as shown in FIG. 8, the plate cylinder 1 is pivotally supported by a frame plate 60 via a rotating shaft 3, and a movable rail 61 having rotating rollers 62 at the end is attached to the frame plate 60. The movable rail 61 is configured to slide in the axial direction of the plate cylinder 1 along a guide rail 63 fixed to the machine frame using rotating rollers 62, and by pulling it out to the left in FIG. The fuselage unit can be removed from the machine frame. A guide bush 66 provided on a side plate 65 of the machine frame serves as an insertion guide for the tip of the rotating shaft 3 when the plate cylinder unit is stored in the machine frame, and also as a support for the rotating shaft 3 after it is stored. There is. 67
is a gear integrated with the plate cylinder 1, and is supported so as to be rotatable around the rotating shaft 3. As shown in FIG. 9, a gear 68 meshing with the gear 67 is provided on a rotating shaft 69 pivotally supported by a side plate 65, and a timing pulley 70 is attached to the rotating shaft 69. A timing belt 71 is wound around a timing pulley attached to the drive member. As shown in FIGS. 9 to 12, the gear 67 has a disk-shaped flange 67a on the end surface opposite to the plate cylinder 1, and the flange 67a has three tooth-shaped notches in a part of the circumference. 67b. On the other hand, the gear 68 also has a disk-shaped flange 68a on the end surface opposite to the side plate 65.
a is a part in the cylindrical direction with four tooth-shaped notches 68
It has b. As shown in FIG. 10, when the plate cylinder unit is attached or removed, the gear 68 slides the plate cylinder unit in the axial direction while maintaining a constant distance H from the center of the gear 67, and connects the notches 67b and 68b with each other. The gear 67 is used to mesh with the gear 67.
Note that the plate cylinder unit is attached to the machine frame (first
In Figure 0), the flange 67a of the gear 67 is the gear 68.
gear 68.
The a flange 68a is also located at a position where it does not come into contact with the tooth surface of the gear 67.

Due to the above, the plate cylinder unit has both gears 67 and 68.
It cannot be attached to or pulled out from the machine frame unless the notches 67a and 68b are in the same predetermined rotational phase.

The gears 67 and 68 are both module 2 gears and have 30 teeth.

Next, the operation of the above embodiment will be explained.

The printing paper 12, which is fed one by one toward the registration roller device by the paper feed roller 14, is sent between the registration drive roller 17 and the registration driven roller 18, and is once stopped there. When the rotational phase of the plate cylinder 1 reaches a predetermined position, the registration drive roller 17 starts rotating and conveys the printing paper 12 further.

At this time, the leading edge of the printing paper 12 acts to push down the paper detection finger 19, but at this timing, the cam follower 37 is at the maximum diameter part 39a of the cam 39, and the hook part 36a of the pressure release arm 36 and the paper detection finger 19 are pressed down. Hook portion 4 of stopper 42
Since there is a small gap in the engagement part 2a, the paper detection finger 1 pressed by the leading edge of the printing paper 12
9 rotates the pivot 20 slightly.

When the pivot 20 rotates, the paper detection stopper 42
swings clockwise, and the hook portion 36a of the pressure release arm 36 and the hook portion 4 of the paper detection stopper 42
The engagement with 2a is released.

At this time, at the same time, the solenoid 45 is energized by a control device (not shown), and the pressure release stopper 44 swings clockwise around the pivot shaft 45, thereby connecting the hook portion 36b of the pressure release arm 36 and the pressure release stopper. 44 is also released from engagement with the hook portion 44a.

When the plate cylinder 1 further rotates from here, the printing paper 12 is fed first by the rotation of the registration drive roller 17, the cam 39 also rotates in the direction of the arrow, and the cam follower 37 disengages from the maximum diameter portion 39a of the cam 39, releasing the pressure. The arm 36 swings counterclockwise around the pivot 10 by the force of the spring 40.

When the pivot 10 rotates, the lever 9 also swings in the same direction, thereby bringing the press roller 7 closer to the plate cylinder 1.

When the plate cylinder 1 further rotates, the press roller 7 is completely pressed against the outer peripheral surface of the plate cylinder 1 by the force of the spring 40, and at this time, the printing paper 12 is placed between the plate cylinder 1 and the press roller 7. It is sent in and becomes stuck (Fig. 13).

When the plate cylinder 1 further rotates from here, the printing paper 12 sandwiched between the plate cylinder 1 and the press roller 7 is sent to the right in the figure while an image is formed by the transfer of ink.

After printing on this printing paper is finished, the cam 39
rotates further, and the cam follower 37 again engages the cam 3.
It reaches a position above the maximum diameter portion 39a of No.9. At this time, the press roller 7 is separated from the outer peripheral surface of the plate cylinder 1 and is in the state shown in FIG.

Here, unless the next printing paper 12 is fed from the paper feed section, the paper detection finger 19 does not operate and the pivot shaft 20 does not rotate, so the paper detection stopper 42 is biased by the gravity of the weight 43 and the paper detection stopper 42
The hook portion 42a of the pressure release arm 36 engages with the hook portion 36a of the pressure release arm 36.

Furthermore, when paper is not fed, the solenoid 47 is not energized, so the hook portion 44a of the pressure release stopper 44 engages with the hook portion 36b of the pressure release arm 36 by the force of the spring 46. become.

The plate cylinder 1 is further rotated to the home position, i.e. the first
As shown in the figure, the clamp 2 is stopped at a position above the plate cylinder 1. At this time, although the cam follower 37 corresponds to a location other than the maximum diameter portion 39a of the cam 39, the hook portions 36a and 36b of the pressure release arm 36 are connected to the hook portion 42a of the paper detection stopper 42 and the pressure release stopper 44, respectively. Since the press roller 7 is engaged with the hook portion 44a, the press roller 7 is located away from the outer peripheral surface of the plate cylinder 1.

If the plate cylinder 1 is stopped at a fixed position and the press roller 7 is not pressed against the outer peripheral surface of the plate cylinder 1, the plate cylinder 1 becomes an integral unit with the ink roller unit, etc. inside it, and moves in the axial direction. It can be attached and detached by sliding it.

If the printing paper 12 sent by the paper feed roller 14 is sent first by the registration drive roller 17 and the registration driven roller 18 and the paper detection finger 1
If you proceed by pressing down on 9 and the paper jam occurs, in other words, if the paper jam occurs,
The hook portion 42a of the paper detection stopper 42 is disengaged.

It would be best if the paper jam was detected and the energization command was not issued to the solenoid 47, but in reality, the energization command would also be issued to the solenoid 47 without being in time, so the pressure release stopper 44 The hook portion 44a is also disengaged.

When the plate cylinder 1 and the cam 39 further rotate, the pressure release arm 36 swings by the force of the spring 40, and the press roller 7 is released from the plate even though the printing paper 12 is not sent between the plate cylinder 1 and the press roller 7. It ends up being pressed against the outer peripheral surface of the body 1.

FIG. 13 shows this state.

Here, the micro switch S shown in FIG. 1 detects that the lever 9 of the press roller 7 swings counterclockwise around the pivot shaft 10, and even after a predetermined period of time has elapsed after that detection, the printing paper 1 When the detector 28 detects that the paper does not reach the suction conveyance section 27, a control device (not shown) detects the "paper feed jam".
Or, the paper feed roller 14 determines that "discharged paper roll-up" has occurred and feeds the next printing paper 12.
control so as not to rotate. At the same time, the solenoid 47 is controlled not to be energized.

From the state shown in Fig. 13, plate cylinder 1 and cam 3 are
9 rotates to a position where the cam follower 37 is above the maximum diameter portion 39a of the cam 39, the paper detection finger 19 is swung clockwise by the paper jammed near the registration roller device, and the paper detection finger 19 is Hook portion 36 of pressure release arm 36 of detection stopper 42
However, since the solenoid 47 of the pressure release stopper 44 is not energized, the pressure release stopper 44 is swung counterclockwise by the force of the spring 46, and its hook portion 44a is released from the pressure. It is engaged with the hook portion 36b of the release arm 36.

Then, when the plate cylinder 1 rotates further and reaches a fixed position and stops, the press roller 7 is separated from the plate cylinder 1 even though a paper jam has occurred.

FIG. 14 shows this state.

Therefore, in the above case, even if a trouble such as a paper jam occurs in the paper feed section or the registration roller device section, the press roller 7 can be moved away from the plate cylinder 1 while the plate cylinder 1 is stopped at a fixed position. Since they are separated, it is possible to easily slide the plate cylinder 1 as a unit and remove it.

That is, it becomes possible to easily remove the print cylinder unit from the machine frame and remove the jammed printing paper 12, and to clean the press roller 7 stained with ink.

Next, the printing paper 12 on which the image has been formed is transferred to the plate cylinder 1
It tries to roll up while remaining attached to the outer circumferential surface of the
As shown in FIG. 1, the plate is peeled off from the plate cylinder 1 by air blown from the air outlet 23 of the peeling claw 21. The printing paper 12 peeled off from the plate cylinder 1 by the peeling claw 21 is exposed to its own weight and the air intake port 3.
The leading end of the printing paper 12 is attracted to the top surface of the suction box 32 by the negative pressure generated when the paper 3 sucks outside air, and the printing paper 12 that has been suctioned to the top surface of the suction box 32 is pressed against the top surface of the endless belt 30. However, as the endless belt 30 runs, the paper moves away from the plate cylinder 1 and is forcibly conveyed while being pulled toward the paper discharge table (not shown).

15 to 17 show another embodiment for attaching and detaching the plate cylinder unit to the machine frame, and this embodiment discloses a locking mechanism and a detection mechanism for attaching and detaching the plate cylinder unit.

In FIG. 15, 72 is a lock pin on the machine frame side, and the other members are an arm 73, a stopper 74, a lock release lever 75, a spring 76,
77 is attached to the plate cylinder unit 80.

When the plate cylinder unit 80 is pushed into the machine frame as shown in FIG. 15, the arm 73 is pushed by the lock pin 72 and rotated counterclockwise when viewed from direction A in FIG. 16. Then, the upper notch 73 of the arm 73
The lower protrusion 74a of the stopper 74 is pushed in by the force of the spring 76 attached to the lock release lever 75, and the plate cylinder unit 80 is locked in the machine frame as shown in FIG. 17A. At the same time, the upper projection 74b of the stopper 74 presses the actuator of the microswitch S', and it is detected that the microswitch S' is locked. To release the lock, pull the lever 75 toward you in the direction of the arrow.
4 is rotated clockwise, the plate cylinder unit 80 is pushed out a little, and the lock is released as shown in FIG. 17B. At the same time, the upper projection 74b of the stopper 74 separates from the actuator of the microswitch S', so that it is detected that the lock has been released. In this way, the locked state is detected only when the plate cylinder unit 80 is completely locked to the machine frame, and the locked state is detected only when the plate cylinder unit 80 is completely locked to the machine frame.
Since it is not detected when the lock is half-locked, there is no risk of false detection due to vibrations during printing, for example.

(5) Effects Since this device has the above-mentioned configuration, the air between the tip of the printing paper discharged from the plate cylinder and press roller and the plate cylinder is released from the air outlet provided at the tip of the peeling claw. By blowing air into the gaps, printing paper can be reliably removed from the plate cylinder, thus eliminating the curling up that occurs in the past, and completely eliminating paper ejection errors. effective.

[Brief explanation of the drawing]

Fig. 1 is a front view showing an embodiment of this invention, Fig. 2 is an enlarged front view of the plate cylinder and press roller section of the above, and Fig. 3 is an enlarged side view of the plate cylinder and press roller section of the above. 4 is a side sectional view of the peeling claw in FIG. 1, FIG. 5 is a front view showing the swinging mechanism of the press roller in the above, FIG. 6 is an exploded perspective view showing the support cylinder of the plate cylinder in the above, and FIG. Fig. 7 is an enlarged sectional view of the main part of Fig. 3, Fig. 8 is a partially longitudinal side view showing the plate cylinder mounting section of the above, and Fig. 9 is a plate cylinder drive section taken along the - line in Fig. 8. A plan view showing the state before installation of the first
Figure 0 is a plan view showing the state of the above plate cylinder drive unit after installation, Figure 11 is a perspective view of gears used in the above plate cylinder drive unit, and Figure 12 is a state in which the gears in Figure 11 are meshed. 13 and 14 are front views corresponding to FIG. 5 for explaining the operation, FIG. 15 is a perspective view showing another embodiment for attaching and detaching the plate cylinder unit to the machine frame, and FIG. 16 15 is an enlarged view of the main part of the part shown in FIG. 15, and FIGS. 17A and 17B are main part drawings for explaining the operation of the same. 1... Plate cylinder, 2... Clamp, 4... Ink supply roller, 5... Doctor roller, 7... Press roller, 11... Paper feed table, 12... Printing paper, 1
4...Paper feed roller, 15...Calling roller, 1
7... Registration drive roller, 18... Registration driven roller, 21... Peeling claw, 23... Air outlet, 24... Communication path, 25... Air supply hose, 27... Adsorption conveyance section.

Claims (1)

[Scope of utility model registration request] In a paper discharge device of a printing press, in which a peeling claw is provided on the paper discharge side of the plate cylinder and press roller, the tip of the peeling claw close to the plate cylinder is used to remove the printing paper discharged from the plate cylinder and press roller. A paper discharge device for a printing press, characterized in that it is provided with an air outlet that blows air into the gap between the leading end and the plate cylinder to peel off the printing paper from the plate cylinder.