JPS6329562Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an automatic control lever return device for an offset printing press that controls a series of printing processes by rotating a single control lever after printing a predetermined number of sheets.

Generally, an offset printing machine has a plate cylinder 1, a blanket cylinder 2, and an impression cylinder 3, as shown in FIG. After applying ink and a dampening liquid to the surface of the original plate by the unit 9 and the inkductor unit 10, and then transferring the image on the original onto the blanket cylinder 2, a paper feeding mechanism 7 is applied between the blanket cylinder 2 and the impression cylinder 3. The image transferred to the blanket cylinder 2 is printed on the fed paper. After printing on a predetermined number of sheets of paper, the original plate is removed from the plate cylinder 1 by a plate discharge mechanism 6, and the blanket cylinder 2 is cleaned by a blank cleaning mechanism 5.

Then, by operating a single operating lever, the ink is mixed, the ink and dampening liquid are applied to the surface of the original plate, and the printing paper is trial printed, after which printing is performed, and the predetermined number of sheets of paper are printed. Later, it was introduced as a device that automatically returns to the stage of ink application.
Publication No. 19408 is known, but ink kneading stops,
Not only is it not possible to return to the point where the original plate is removed or the machine stops, but also because the blank cleaning position is placed across from the machine stop position, these steps require manual operation and are fully automated. It was something I couldn't get.

Furthermore, in Japanese Patent Application Laid-open No. 46-2404, a ratchet equipped with an operating shaft has functions such as ``machine stop'', ``motor connection/blank cleaning'', ``ink supply'', ``water supply'', and ``etching''.
"Ink application""Image transfer from the plate cylinder to the blanket cylinder"
There is a disclosure of a configuration in which each stage of printing is completed by forming teeth in accordance with the position of the "paper feed" and making one rotation of the teeth with a feed pawl that is linked to the drive of the machine. The machine is operated by electromagnetic operation of an electric switch, and the machine stops after printing without going through a blanket cleaning process, and then performs a blanket cleaning when the machine restarts, so the image is transferred to the blanket cylinder and it becomes dirty. If the machine stops in a state where the image is dry and the image is dry when the machine is restarted, it is not possible to quickly and completely clean the image with a blank.

The present invention was developed in view of the above-mentioned problems, and covers each process up to printing, including plate feeding, application of water and ink to the fed plate surface, image transfer from the plate surface to the blanket cylinder, and paper feeding. The operating shaft is manually rotated step by step while checking the condition visually, and after the predetermined number of sheets have been printed, the process goes through plate ejection and blank cleaning until the printing machine stops driving. The process is completely automated from the start of printing to plate ejection, blank cleaning, and stopping of the printing press by making the operating shaft automatically rotatable and returning, and by completing the blank cleaning when the printing press stops. To provide an automatic operating lever return device for an offset printing press that greatly improves the operability of the printing press by allowing quick, complete, and easy blank cleaning without drying images transferred to the blanket cylinder. It is something to do.

The following is a detailed description of the drawings showing an embodiment of the present invention. First, in FIG.
, blanket cylinder 2, impression cylinder 3, plate feeding mechanism 4, blank cleaning mechanism 5, plate discharging mechanism 6, paper feeding mechanism 7, paper discharging mechanism 8, water duct section 9, ink duct section 10, etc. An operating lever 12 as shown in FIG. 3 and a cam 13 as shown in FIG. 4 are fixed to one end of the operating side of an operating shaft 11 installed on a printing press frame (not shown). .

The cam 13 has five cam surfaces 13a, 13b,
The cam surfaces 13a...
A roller 16 is pivotally attached to one end of a lever 15, the center of which is pivotally attached to a printing press frame (not shown) by a pivot 14, so as to be releasably engageable with the roller 16.
The lever 15 is elastically biased by a spring 17 stretched between the other end and the printing machine frame, so that the roller 16 is elastically engaged with the cam surfaces 13a, . . . , and the operating lever 12 is moved as shown in FIG.
The cam surface 13e is formed so as to be capable of movably engaging with the roller 16 to return the operating lever 12 to any of the above positions.

Further, as shown in FIG. 2, a ratchet 24 and switch cams 39, 40, 41 or links are fixed to one end of the operating shaft 11 on the non-operating side, and are arranged in phase with each other in the circumferential direction. By rotating the cam 3 in stages, the cam 3
9, 40, 41 etc. are switches 4 provided on the frame
2, 43, 44 or a link (not shown), respectively, so that each mechanism and each part is interlocked as shown in FIG.

That is, when the operating lever 12 is in the neutral position, the printing press is stopped. The operating lever 1
When the plate 2 is manually moved, a drive motor (not shown) is driven, and the plate feeding mechanism 4 is also driven, so that the plate is fed onto the plate cylinder 1 and wound thereon. Then, the duct rollers 18, 19 of both the water and ink duct sections 9, 10 stop their swinging motion, and the rollers 20, 21 to the form roller 22,
The supply of water and ink to 23 is stopped.

When the operating lever 12 is further manually moved, the duct rollers 18 and 19 of the water and ink duct sections 9 and 10 begin to swing, and the form rollers 22 and 23 are wound around the plate cylinder 1. Touch the surface of the plate (not shown) to apply water and ink. When the operating lever 12 is manually moved, a pump motor (not shown) is driven, and the suction foot of the paper feed mechanism 7 starts suction, and the plate cylinder 1 and the blanket cylinder 2 are forcibly brought into contact to form an image on the plate. Transfer to rubber cylinder 2.

Next, when the operating lever 12 is manually moved to the left, the forced contact between the plate cylinder 1 and the blanket cylinder 2 is released, and when the control lever 12 is moved to the empty position, the paper feed mechanism 7 is driven and the blanket cylinder 2 and the impression cylinder 3 are A sheet of paper is fed in between, and the cam surface 13 of the cam 13 is positioned at
At the same time as the operating lever 12 is returned by e, the plate cylinder 1 touches the blanket cylinder 2 to enter the printing state, and when the operating lever 12 is moved from the printing state to When moving from the form rollers 22,2
3 separates from the plate cylinder 1 to stop applying water and ink to the plate cylinder, and the plate discharge mechanism 6 operates to remove the plate from the plate cylinder 1.
At the same time as the blanket cylinder 2 is removed from the blanket cylinder 2, the blank cleaning mechanism 5 is operated to start cleaning the image transferred to the blanket cylinder 2.
During this period, the oscillating motion of the duct rollers 18 and 19 of both the water and ink duct sections 9 and 10 is stopped, and when the duct rollers 18 and 19 move from the water to the ink duct section, the blank cleaning mechanism 5 is stopped and the pump motor and the drive motor are also stopped. There is.

Incidentally, the pump motor in the above embodiment operates when the operating lever 12 is moved from the empty position.
However, since the pump motor is for suctioning the suction foot of the paper feed mechanism 7, the pump motor is operated at any position before the movement from to, and then it stops. What is necessary is to stop at any position after moving from to.

Thus, in this device, a ratchet 24 is fixed to the opposite side of the operating shaft 11 as shown in FIG. 2, and a claw 25 that engages with the ratchet 24 is fitted to the rubber cylinder shaft 26.
and a crank mechanism 27 for interlocking and swinging the pawl 25 and the ratchet 24. A pin 31 of the pawl 25 engages with a cam 30 which is pivotally mounted on the printing press frame by a shaft 28 and operated by a solenoid 29, so that the pawl 25 can be engaged and disengaged with the ratchet 24 by the cam 30. Further, the solenoid 29 is electrically connected to a print number counter (not shown) of the printing press, so that when a printing end signal is given from the counter, the solenoid 29 operates to operate the cam 30 and engage the pawl 25 with the ratchet 24, thereby enabling the operating lever 12 to automatically return to the position from the above position.

Here, the crank mechanism 27 has the pawl 25 disposed at one end of a lever 32 that is loosely fitted onto the operating shaft 11, and the other end of the lever 32 is attached to the rubber cylinder shaft 26.
The crank pin 34 and the link 3 are eccentrically provided.
5, and as the rubber cylinder shaft 26 rotates, the pawl 25 engages the teeth 2 of the ratchet 24.
When engaged with 4a, the ratchet 24 is swingably formed to rotate.

Further, the cam 30 is resiliently biased counterclockwise in the figure by a spring 36 stretched between it and the printing press frame (not shown), and is held in contact with a stopper 37. In this state, the cam 30 cam surface 3
0a pushes up the pin 31 of the pawl 25 to keep the pawl 25 from engaging with the ratchet 24, and only when the solenoid 29 is activated by energization in this state, the cam 30 is rotated clockwise via the link 38. When the pawl 25 is rotated in this direction, the pawl 25 is lowered and engaged with the ratchet 24.

The ratchet 24 is provided with at least five teeth 24a corresponding to each position of the operating lever 12, and when the solenoid 29 is operated, the ratchet 24 is moved by the swinging of the pawl 25.
4. The operation shaft 11 and the operation lever 12 are provided so that they can be automatically rotated back from the position to the position in stages.

In the above configuration, when the operating lever 12 is operated in the direction from the neutral position shown in FIG. 3, the cam 13, which is integral with it via the operating shaft 11, is rotated in the same direction. Since force is applied, the roller 16 is moved to the cam surface 1 at this time.
3a, the lever 5 swings against the tension of the spring 17, and the roller 16 disengages from the cam surface 13a and at the same time engages with the other cam surface 13b, and the operating lever 15 is at the position. Moved and held. If the operating lever 12 is further actuated, it will be operated to the position , in the same manner as described above.

In this way, when the operating lever 12 is moved to the position , paper is fed as shown in FIG. 5, and when the operating lever 12 is then released, the long cam surface 13
As the roller 16 rolls through e, the operating lever 12 automatically returns to the position , and the plate cylinder 1 and blanket cylinder 2 are automatically brought into contact, resulting in a printing state.

When a predetermined number of prints have been printed, the solenoid 29 is activated by a signal from a print number counter (not shown), and the cam 30 is swung to release the push-up of the pawl 25, so that the pawl 25 engages with the teeth 24a of the ratchet 24. and a crank mechanism 2 interlocked with the rubber cylinder shaft 26.
7 rotates the ratchet 24 by one tooth 24a.

Therefore, the operating lever 12 is operated via the operating shaft 11.
Return position by position.

Also, when the operating lever 12 automatically returns as described above, the lever 15 is swung against the tension of the spring 17 by the curved surfaces of the cam surfaces 13a, 13b, 13c, 13d, and 13e as described above. This allows the position to be determined in stages.

In the above embodiment, the rubber cylinder shaft 26 is
Although the blanket cleaning is performed during the rotation, if you wish to perform the blanket cleaning while the rubber cylinder shaft 26 rotates several times, as shown in FIG. A cam 41 and a switch 44 are provided so as to be turned on when the time is reached, and the ON signal from the switch releases the solenoid 29, disengages the ratchet 24 and the pawl 25, and operates a blank cleaning timer (not shown). The solenoid 29 may be operated again by a time-up signal from a timer.

As explained above, according to the automatic operating lever return device for an offset printing press according to the present invention, each process of the printing press is performed by reciprocating rotation of a single operating lever, and the return path of the operating lever is In addition to arranging the plate discharge and blank cleaning processes in the interior, after manually operating the operating lever 12 from the neutral position to the paper feeding position, the cam surface 13e automatically returns to the printing position to set the printing state, and then the predetermined When the solenoid 29 is activated by a signal from the print number counter at the same time that the number of sheets printed is finished, the pawl 25 engages with the ratchet 24 and automatically returns the operating lever 12 one position at a time to the neutral position. Therefore, by associating these mechanisms with the operation shaft 11 so as to perform plate ejection and blank cleaning in the return process, it is possible to completely automate the process from the initial stage of printing to plate discharge, blank cleaning, and machine stoppage. First, we made sure to perform the blank cleaning before the machine stopped.
Blanking can be done quickly, completely, and easily before the image transferred to the blanket cylinder 2 dries. Therefore, next time, just manually move the operating lever 12 from the neutral position to discharge the plate and clean the blank. The printing state can be immediately achieved without going through any process, improving operability, and the lever operation is easy and does not require any special skills. Since it can be operated manually, it is fully automated from the initial stage of printing to stopping the machine after checking the amount of water and ink applied, the state of plate feeding, etc., which prevents printing mistakes at the beginning of printing. Moreover, it has practical effects such as enabling good printing.

[Brief explanation of the drawing]

Fig. 1 is a schematic central cross-sectional view of an offset printing press, Fig. 2 is a front view showing an automatic operating lever return device according to the present invention, and Fig. 3 is a front view showing the operating lever of the same device and its moving position. Figure 4 is a front view showing the positioning mechanism of the operating lever in the device;
FIG. 5 is a diagram showing the operational relationship between the operating lever position and each mechanism and part of the printing press in the same device. 4... plate feeding mechanism, 5... blank cleaning mechanism, 6...
...plate ejecting mechanism, 11...operation shaft, 12...operation lever, 24...ratchet, 25...claw, 26...
Rubber cylinder shaft, 27... crank mechanism, 29... solenoid, 30... cam.

Claims (1)

[Scope of utility model registration request] By reciprocating the operating shaft to which multiple cams or links are fixed, either manually on the outward trip or automatically on the return trip, the drive motor, plate feeding mechanism, and water and ink can be rotated in a step-by-step manner. The forcible stop mechanism of the duct unit is activated, and the forcible stop mechanism of the plate feeding mechanism and water/ink duct unit is released by switching from , and the form roller is touched to the plate cylinder. The blanket cylinder is forcibly touched, the forcible touch between the plate cylinder and the blanket cylinder is released by switching from , the paper feeding mechanism is activated by switching from , printing starts by switching from , and the paper feeding mechanism is activated by switching from . When the duct stops, printing is stopped, and when the switch from . In an automatic lever return device for an offset printing press, which releases the operation of the forced stop mechanism of both ducts, the plate ejecting mechanism, and the drive motor, the blank cleaning mechanism is activated by switching from to through, and is activated by switching from to to. The operating shaft can be returned by engaging a ratchet fixed to the operating shaft with a swingable pawl connected to the plate cylinder, blanket cylinder or impression cylinder. A cam pivotally mounted on the frame of the printing press is operably connected to a solenoid electrically connected to the print number counter and engaged with the pawl, so that the printing end signal from the print number counter causes the cam to be activated. An automatic operating lever return device for an offset printing press, characterized in that the operating shaft is capable of automatically returning by engaging a pawl and a ratchet.