JPH05155001A - Register mechanism of offset printing press and printing part movement mechanism - Google Patents

Abstract

PURPOSE:To enable data to be registered efficiently and a printing cylinder to be replaced speedily by providing a control part for setting automatically each base which is movable with a guide rail a any appropriate printing position so that a printing part is set to a correct position. CONSTITUTION:An offset printing press is stopped, then a base 10 is moved from its current position to a home position confirmed by a detection part 30, and is further moved from this position to an appropriate printing position calculated previously for correct printing. Next, if the base 10 is set to the appropriate printing position, a clutch 19 is deenergized by a signal from controls 11, 12 and the clutch-halves 19a, 19b become separated to stop a driving force to a screw rod 15. With this suspension of the driving force transmission, an electric power supply to an electromagnetic backing device 21 is cut. Further, the rotation of the screw rod 15 stops and the base 10 becomes locked at an appropriate position by braking action of the electromagnetic braking device 21 to perform a printing process. In addition, the distance between the second and the third printing part 6 as well as the third and the fourth printing part becomes wide due to a signal from the control parts 11, 12 for example, if a plate cylinder 3 is to be replaced. Thus the plate cylinder 3 can be replaced easily.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a register mechanism in an offset printing machine capable of efficiently positioning a web and a printing section moving mechanism in an offset printing machine capable of quickly exchanging a plate cylinder and the like.

[0002]

2. Description of the Related Art Conventionally, in the case of tandem type web printing, a register (web positioning) has been used by an operator to actually perform a test print and visually check the amount of print misalignment. Is moved forward and backward with respect to the web feeding path to set each printing unit to an appropriate printing position.

This register work is necessary at various times such as during initial setting and during fine adjustment such as when print displacement occurs due to web tension during printing and fine adjustment is required, and during plate cylinder replacement. It is very troublesome because the operator has to work each time.

It is a technical object of the present invention to provide a register mechanism and a printing unit moving mechanism in an offset printing machine which can solve the above problems and can quickly replace the plate cylinder of the printing unit. Is.

[0005]

The gist of the present invention will be described with reference to the accompanying drawings.

[0006] In a tandem type offset printing machine comprising a paper feed section 2 around which a web 1 is wound, and a plurality of printing sections 6 in which a plate cylinder 3, a blanket cylinder 4 and an impression cylinder 5 are arranged in a vertical direction, A guide rail 9 is provided in parallel along the machine body 13 in the vicinity of the feeding path 8, and a plurality of bases 10 on which the printing unit 6 is fixedly attached are attached to the guide rails 9, and each base 10 is attached to the guide rail 9. A control unit 11 is provided slidably with respect to each other so that each base 10 is automatically set to an appropriate printing position so that the printing unit 6 attached to each base 10 is arranged at an appropriate position. The present invention relates to a register mechanism in an offset printing machine.

In a tandem type offset printing machine comprising a paper feeding section 2 around which a web 1 is wound, and a plurality of printing sections 6 in which a plate cylinder 3, a blanket cylinder 4 and an impression cylinder 5 are arranged in a vertical direction, A guide rail 9 is provided in parallel along the machine body 13 in the vicinity of the feeding path 8, and a plurality of bases 10 on which the printing unit 6 is fixedly attached are attached to the guide rails 9, and each base 10 is attached to the guide rail 9. Adjacent to the one base 10 to which the cylinder to be replaced is attached when the plate cylinder 3, the bracket cylinder 4, the impression cylinder 5, etc. of the printing unit 6 provided slidably with respect to each other, are attached to each base 10. The present invention relates to a printing unit moving mechanism in an offset printing machine, which is provided with a control unit 12 for sliding the other base 10 in a direction away from the one base 10.

[0008]

The function of the present invention will be described.

Under the control of the control unit 11, each base 10 slides on the guide rails 9 and the printing unit 6 having the plate cylinder 3, the blanket cylinder 4, and the impression cylinder 5 attached to the base 10 has a web. 1
Is automatically moved to an appropriate printing position (a position previously calculated in consideration of the web feed length, plate cylinder diameter, blanket cylinder diameter, impression cylinder diameter, etc.), and each of the bases 10 is moved. The web 1 delivered from the paper feed unit 2 by the printing unit 6 is printed in an appropriate state in multiple colors.

The invention according to claim 2 will be described.

When replacing, for example, the plate cylinder 3 of one base 10, the direction in which the other base 10 adjacent to the one base 10 moves away from the one base 10 by the control of the control unit 12. By sliding on the guide rail 9, the distance between the one base 10 and another adjacent base 10 is widened, so that the plate cylinder 3 of the one base 10 can be easily replaced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The drawings show the case where the present invention is applied to a six-color tandem offset printing machine, which will be described below.

Each of the six printing units 6 has a structure in which the plate cylinder 3, the blanket cylinder 4, and the impression cylinder 5 are vertically arranged in this order from above, and between the lower edge of the blanket cylinder 4 and the upper edge of the impression cylinder 5. A web feed path 8 is formed in the.

The printing unit 6 is fixedly mounted on a base 10. The base 10 is mounted on two guide rails 9 fixed on the left and right of the machine body 13 (upper and lower in FIG. 2) in parallel. It is slidably arranged through appropriate means (eg, rolling balls).

Since the drawing shows a six-color machine, six bases 10 with the printing section 6 as described above are arranged.

Reference numeral 14 is a drive shaft, and one drive shaft is arranged from the first printing unit 6 (left side in FIG. 1) to the sixth printing unit 6 (right side in FIG. 1) in a passing state. It is rotatably provided by a drive source (not shown).

Although it is possible to separately provide the drive shaft 14 for each printing unit 6, in this case, it is desirable to separately provide the drive sources.

Reference numeral 15 is a screw rod arranged in each of the printing units 6 one by one, in a loosely fitted state with a gear 16 provided on the drive shaft 14 and a shaft rod 18 continuously provided on the front side of the screw rod 15. Gear 17 provided
Has been meshed with the teeth.

Reference numeral 19 is an electromagnetic clutch in which the halves 19a and 19b come into contact with each other, and the front half body 19a is rotatably fitted to the shaft rod 18. Key 2 to gear 17
The rear half body 19b is fitted with a shaft rod.
It is fitted in 18 in a non-rotating state.

The clutch 19 is a separated half body 19a.1
9b is contacted by energization, the rotation of the gear 17 is the half body 19a, 19b,
It is transmitted to the screw rod 15 via the shaft rod 18.

Reference numeral 21 is an electromagnetic brake device for stopping the rotation of the shaft rod 18, that is, the screw rod 15, and is an off-brake whose brake action is released by energization. This prevents the base 10 from overtraveling due to the rotation of the screw rod 15, that is, the shaft rod 18.

Reference numeral 22 is a transmission gear attached to the shaft rod 18, reference numeral 23 is a transmission gear meshing with the transmission gear 22, reference numerals 24 and 25 are transmission bevel gears, and reference numeral 26 is a rotating shaft of the handle 27.

The handle 27 shown in the drawing is detachably attached to the rotary shaft 26.

Reference numeral 28 is a limit switch for preventing the base 10 from overtraveling.

Reference numeral 30 is a detection section for confirming the position of the base 10, and sends a detection signal to the control sections 11 and 12 described later.

Reference numeral 31 is a mounting portion, reference numeral 32 is a bearing portion, reference numeral 33.
Is a punching section, reference numeral 29 is a product winding section, reference numeral 34 is an operation section,
Reference numeral 7 is a punching scrap winding unit.

The control units 11 and 12 send signals to the servomotors that control the rotation of the drive shaft 14, and each base 10 moves from an arbitrary existing position to the origin position confirmed by the detection unit 30. Then, subsequently, the drive shaft 14 is rotated to move to the proper printing position of each printing unit 6 calculated in advance from this origin.

The control units 11 and 12 are limit switches.
When the base 10 overruns to the position of the limit switch 28, the rotation of the drive shaft 14 is stopped.

Further, the electromagnetic brake device 21, the clutch 19
Is also linked to the control units 11 and 12.

The rotation control of the screw rod 15 by the control units 11 and 12 is independently performed for each printing unit 6.

Since the embodiment is constructed as described above, the following operational effects are exhibited.

The automatic register operated by the control units 11 and 12 will be described.

In order to set the predetermined base 10 to the proper printing position, first, the operation of this machine is stopped.

Next, the drive shaft is controlled by the control units 11 and 12.
14 is rotated and screwed through gears 16 and 17 and shaft 18
5 rotates, the base 10 moves from the current position to the origin position confirmed by the detection unit 30, and the proper printing position (web feed length, which is calculated in advance from this origin position for proper printing), Move to the position calculated beforehand considering the plate cylinder diameter, the blank diameter, the impression cylinder diameter, etc. (this proper printing position is performed by the arithmetic unit attached to this machine). The movement of the base 10 from the origin position to the proper printing position is performed by counting the pulse signals transmitted by the servo motor and controlling the servo motor according to the number of pulse signals.

In this case, since the rotary shaft 26 rotates via the transmission gears 22 and 23 and the transmission bevel gears 24 and 25, the handle 27 is removed from the rotary shaft 26.

When the base 10 is set to the proper printing position, the energization of the clutch 19 is stopped by the signal from the control units 11 and 12, and the half bodies 19a and 19b of the clutch 19 are separated from each other to the screw rod 15. Drive transmission is stopped. When the drive transmission to the screw rod 15 is stopped, the power supply to the electromagnetic brake device 21 is also stopped, and the screw rod 15
Is stopped and the base 10 is locked at the proper printing position by the braking action of the electromagnetic brake device 21.

In this way, each printing unit 6 is set to the proper printing position, and printing is performed by this machine.

When the base 10 travels excessively, the limit switch 28 detects it, and the electromagnetic brake device 21 is actuated to stop the travel of the base 10.

Even if each printing unit 6 is set to the proper printing position, printing deviation occurs due to the tension of the web 1 and heat in the drying process of the printed web 1 during the operation of this machine.

In this case, the automatic fine adjustment is performed by the same operation as above while the machine is operating. The amount of print misalignment in this fine adjustment may be visually confirmed by an operator, but a camera or the like may be provided in the vicinity of the printing unit so that an image from this camera can be displayed on a monitor for confirmation.

Initial setting and fine adjustment are performed as described above, and each base 10 is set at an appropriate printing position. In the normal state, since the rotation of the screw rod 15 is locked by the electromagnetic brake device 21, the sliding of each base 10 due to a slight vibration during the operation of the machine is surely prevented, so that the proper printing cannot be performed. It will certainly be done.

Next, the manual register with the handle 27 will be described.

When the handle 27 is connected to the rotary shaft 26, the clutch 19 is disengaged with the electromagnetic brake device 21 opened, and the handle 27 is rotated, the rotary shaft 26, the transmission bevel gear 2
The screw rod 15 is rotated via the 4/25, the transmission gears 22/23, and the shaft rod 18, and the base 10 is slid on the guide rail 9 to move the base 10
Can be set at the proper printing position.

Next, the case where the plate cylinder 3 of the base 10 is replaced will be described.

For example, the third in FIG. 1 (third from the left)
When replacing the plate cylinder 3 of the printing unit 6 of the
The drive shaft 14 is rotated in response to a signal from the second shaft, the screw rods 15 of the second and fourth print units 6 are rotated, and the second and the third bases 10 of the third print unit 6 are rotated. The fourth base 10 slides away from each other, and the distance between the second printing unit 6 and the third printing unit 6 and the distance between the third printing unit 6 and the fourth printing unit 6 are increased. The space is widened, and the third plate cylinder 3 can be easily replaced.

At this time, the screw rods 15 of the first, fifth, and sixth printing units 6 do not rotate because the clutch 19 is disengaged, and the respective bases 10 do not slide. Of course.

Further, the printing machine according to the embodiment has the printing units 6
Can be slid to the proper printing position independently of the other printing units 6, so that it is possible to select any two printing units 6 in the case of two-color printing, for example.

In the case of a conventional four-color machine, each printing section is provided with, for example, yellow, red, blue, and black inks, respectively. When two-color printing is performed with this four-color machine, the first and second inks are printed. The second printing unit 6 must be used.

For example, if it is desired to print yellow and red, the first and second print sections may be used, but if yellow and black are to be used, each print section is arbitrarily moved. Because it is not possible, the ink of the second printing section has to be changed from red to black, which is very troublesome. Cleaning work is indispensable for replacing ink, and replacing ink is very troublesome.

In this respect, in the printing machine according to the embodiment, since each printing section can be moved to any position, any two printing sections 6 are selected, and each printing section is set to the automatic register. Just move to the proper printing position by
This makes it possible to easily print the desired two colors.

As described above, the printing machine according to the embodiment has various effects.

[0052]

As described above, the present invention provides a register mechanism and a printing section moving mechanism in an excellent offset printing machine that can efficiently perform the register and quickly achieve the effects of the plate cylinder and the like. become.

[Brief description of drawings]

FIG. 1 is a front view in which a part of the present invention is omitted.

FIG. 2 is a plan sectional view of a main part of the present invention.

[Explanation of symbols]

 1 web 2 paper feed unit 3 plate cylinder 4 blanket cylinder 5 impression cylinder 6 printing unit 8 web feed path 9 guide rail 10 base 11 control unit 12 control unit 13 machine body

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Makoto Umezawa Niigata Prefecture Sakae-cho, Sakae-cho Inojiba 1300, Nitta Inside Sanjo Machine Works Co., Ltd. 1300 Ta, inside Sanjo Machinery Co., Ltd.

Claims (2)

[Claims] 1. A paper feed unit around which a web is wound, a plate cylinder,
In a tandem type offset printing machine consisting of a plurality of printing units with blanket cylinders and impression cylinders arranged in the vertical direction, guide rails are installed side by side along the machine body near the web feed path,
A plurality of bases each having a printing unit fixed thereto are attached to the guide rails, and the respective bases are slidably provided with respect to the guide rails, and the printing units attached to the respective bases are arranged at appropriate positions. A register mechanism in an offset printing press, which is provided with a control unit for automatically setting each base to an appropriate printing position. 2. A paper feed unit around which a web is wound, a plate cylinder,
In a tandem type offset printing machine consisting of a plurality of printing units with blanket cylinders and impression cylinders arranged in the vertical direction, guide rails are installed side by side along the machine body near the web feed path,
A plurality of bases with fixed printing units are attached to the guide rails, and each of the bases is provided slidably with respect to the guide rails.
When exchanging an impression cylinder or the like, an offset is provided with a control section for sliding another base adjacent to one base provided with the cylinder to be replaced in a direction away from the one base. Printing unit moving mechanism in a printing machine.