JP2000272079A - Offset press - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress deviation generated between moving speed of a moving table and peripheral speed of a rotating blanket small and to improve accuracy of printing position. SOLUTION: An intaglio 1 and a work 2 are held on a moving table 21. A motor 23 for driving the moving table is arranged on the end part of a base 11 and the moving table 21 moves on the base 11. The rotating blanket 31 is constituted of a metal cylinder 32 and a blanket sheet 33 mounted on the outer periphery. The metal cylinder 32 is supported on the inside of leg parts 15a of a frame through bearings 35 and guides 18 on its both ends. A pressing force is applied on the moving blanket 31 through the bearings from a pressing cylinder 36. A gear box 37 is fitted on one end part of the metal cylinder 32 and the metal cylinder 32 is connected with a motor 38 for driving the moving blanket through this gear box 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an intaglio offset printing press using a rolling blanket, and more particularly to a mechanism for controlling the peripheral speed of a rolling blanket.

[0002]

2. Description of the Related Art FIG. 2 shows a schematic configuration of a conventional intaglio offset printing press. Intaglio offset printing press is based 1
1, a frame 15, a moving table 21, a rolling blanket 31, and the like.

The intaglio 1 and the work 2 (substrate to be printed) are held on a moving table 21. The moving table 21
The base 1 is supported on a base 11 via a guide 12.
1 can be moved in the front-rear direction (in the left-right direction in FIG. 2B) along the upper surface of the first member 1. A motor 23 for driving the moving table is arranged at one end of the base 11. The shaft of the motor 23 is connected to a threaded rod 24, which is fitted into a female thread 25 provided on the moving table 21 side. By driving the motor 23, the moving table 21 moves on the base 11.

A gate-shaped frame 15 is arranged so as to straddle the vicinity of the center of the base 11. Frame leg 15a
Is fixed on the base 11. Frame leg 1
A vertical guide 18 is mounted inside 5a, and a pressing cylinder 36 is fixed to the center of the beam 15b of the frame.

[0005] The rolling blanket 31 comprises a metal cylinder 32 and a blanket sheet 33 mounted on the outer periphery thereof. The metal cylinder 32 is supported at both ends thereof through the bearing 35 and the guide 18 inside the leg 15a of the frame. A downward pressing force is applied to the rolling blanket 31 from a pressing cylinder 36 via a bearing 35.

[0006] A pinion 41 is attached to one end of the metal cylinder 32 (an inner portion of the bearing 35), and the pinion 41 meshes with a rack 42 attached to a side surface of the moving table 21. With the movement of the moving table 21, the movement is transmitted to the metal cylinder 32 via the rack 41 and the pinion. That is, the rolling blanket 31 rotates following the movement of the moving table 21.

(Problems of the conventional apparatus) In the conventional intaglio offset printing press as shown in FIG.
1 is connected to the moving table 21 via a rack and pinion mechanism (41, 42), and is configured to rotate following the movement of the moving table 21. For this reason, the blanket sheet 3 is pressed by the pressing force against the work 2 or the like.
3 changes the substantial diameter of the rolling blanket 31 and causes a subtle difference between the pinion 41 and the pitch circle diamond, thereby causing the moving table 21 to move.
A slight deviation occurs between the moving speed of the rolling blanket 31 and the peripheral speed of the rolling blanket 31. Such a deviation between the moving speed of the moving table 21 and the peripheral speed of the rolling blanket 31 has caused a printing position error (span error). Also, a pitch error of the rack, a backlash of the rack and pinion mechanism, and the like have similarly caused a printing position error.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the conventional offset printing press as described above, and an object of the present invention is to provide an intaglio offset printing press using a rolling blanket. Another object of the present invention is to provide an intaglio offset printing press having high printing position accuracy by suppressing a deviation between a moving speed of a moving table and a peripheral speed of a rolling blanket.

[0009]

SUMMARY OF THE INVENTION An offset printing press according to the present invention is an offset printing press for transferring ink transferred from an intaglio printing plate to a rolling blanket and then transferring the transferred ink from the rolling blanket to a work. A moving table on which an intaglio plate and a work are held on the upper surface, a rolling blanket arranged above the moving table, a first drive mechanism for driving the movable table, and provided independently of the first drive mechanism, A second drive mechanism for driving the rolling blanket, and a numerical controller for independently controlling the first drive mechanism and the second drive mechanism are provided.

In the offset printing press of the present invention, a driving mechanism (second driving mechanism) for driving the rolling blanket is provided separately from the driving mechanism (first driving mechanism) for driving the moving table. The numerical controller sends a control signal to the first drive mechanism to control the moving speed of the moving table, and independently of this, sends a control signal to the second drive mechanism to control the peripheral speed of the rolling blanket. .

According to the offset printing press of the present invention, the peripheral speed of the rolling blanket can be finely adjusted independently of the moving speed of the moving table. Alternatively, the moving speed of the moving table can be finely adjusted independently of the peripheral speed of the rolling blanket. Therefore, the state of the printed matter is monitored, and if a positional error appears in the printed matter, the operator finely adjusts the peripheral speed of the rolling blanket (or the moving speed of the moving table) as necessary according to the degree of the positional error. By doing so, it is possible to remove the deviation of the peripheral speed of the rolling blanket from the moving speed of the moving table.

Preferably, the numerical controller is a setting input unit for inputting a set value of a moving speed of the moving table, and a correction input unit for inputting a correction value for finely adjusting a peripheral speed of the rolling blanket. A control signal corresponding to the set value is sent to the first drive mechanism, and a control signal corresponding to a value obtained by adding the correction value to the set value is transmitted to the second drive mechanism. Is configured to send.

As described above, instead of the method of making the peripheral speed of the rolling blanket coincide with the moving speed of the moving table as a reference, the moving speed is adjusted based on the peripheral speed of the rolling blanket. The moving speed of the table can be matched.

In this case, the numerical controller is
Setting input means for inputting a set value of the peripheral speed of the rolling blanket, and correction input means for inputting a correction value for finely adjusting the moving speed of the moving table; And transmitting a control signal corresponding to the set value and a control signal corresponding to a value obtained by adding the correction value to the set value to the first drive mechanism.

[0015]

FIG. 1 shows a schematic configuration of an intaglio offset printing press according to the present invention.

In the figure, 11 is a base, 15 is a frame, 2
1 is a moving table, 23 is a motor for driving the moving table, 31 is a rolling blanket, 37 is a gear box, 3
Reference numeral 8 denotes a motor for driving a rolling blanket.

The intaglio 1 and the work 2 (substrate to be printed) are held on a moving table 21. The moving table 21
The base 1 is supported on a base 11 via a guide 12.
1 can be moved in the front-rear direction (in the left-right direction in FIG. 1B) along the upper surface of the first member 1. A motor 23 for driving the moving table is arranged at one end of the base 11. The shaft of the motor 23 is connected to a threaded rod 24, which is fitted into a female thread 25 provided on the moving table 21 side. By driving the motor 23, the moving table 21 moves on the base 11.

A gate-shaped frame 15 is arranged so as to straddle the vicinity of the center of the base 11. Frame leg 15a
Is fixed on the base 11. Frame leg 1
A vertical guide 18 is mounted inside 5a, and a pressing cylinder 36 is fixed to the center of the beam 15b of the frame.

The rolling blanket 31 comprises a metal cylinder 32 and a blanket sheet 33 mounted on the outer periphery thereof. The metal cylinder 32 is supported at both ends thereof through the bearing 35 and the guide 18 inside the leg 15a of the frame. A downward pressing force is applied to the rolling blanket 31 from a pressing cylinder 36 via a bearing 35.

A gear box 37 is attached to one end of the metal cylinder 32 (inside the bearing 35). The metal cylinder 32 is connected to a motor 38 for driving a rolling blanket via the gear box 37. It is connected.

The motor 23 for driving the moving table and the motor 38 for driving the rolling blanket are both controlled by a numerical controller (not shown). The numerical controller has a function of inputting a set value of the moving speed of the moving table 21 and a function of inputting a correction value for finely adjusting the peripheral speed of the rolling blanket 31. The numerical controller sends a control signal corresponding to the set value to the motor 23 to control the moving speed of the moving table 21. Further, the numerical controller sends a control signal corresponding to a value obtained by correcting the set value with the correction value to the motor 38 to control the peripheral speed of the rolling blanket 31.

When operating this intaglio offset printing press,
The operator monitors the state of the printed matter, and if a position error appears, the peripheral speed of the rolling blanket 31 (or the moving speed of the moving table 21) as needed according to the degree of the position error.
Fine adjustment of. As a result, it is possible to remove the deviation of the peripheral speed of the rolling blanket 31 from the moving speed of the moving table 21.

[0023]

According to the offset printing press of the present invention, a drive mechanism (second drive mechanism) for driving the rolling blanket is provided separately from the drive mechanism (first drive mechanism) for driving the moving table. Therefore, the circumferential speed of the rolling blanket can be finely adjusted independently of the moving speed of the moving table (or the moving speed of the moving table can be finely adjusted independently of the circumferential speed of the rolling blanket). Can be adjusted).

Therefore, the operator monitors the state of the printed matter and makes fine adjustments to the peripheral speed of the rolling blanket (or the moving speed of the moving table) as needed, so that the peripheral speed of the rolling blanket can be adjusted to the moving speed of the moving table. , And high printing accuracy can be realized.

[Brief description of the drawings]

FIG. 1 is a diagram showing a schematic configuration of an offset printing press according to the present invention, (a) is a front view, and (b) is a side view.

FIG. 2 is a diagram showing a schematic configuration of a conventional offset printing press;
(A) is a front view, (b) is a side view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Intaglio, 2 ... Work (substrate to be printed) 11 ... Base, 12 ... Guide, 15 ... Frame, 15a ... Leg, 15b ... Beam, 18 ...・ Guide, 21 ・ ・ ・ Moving table, 23 ・ ・ ・ Motor, 24 ・ ・ ・ Rod, 25 ・ ・ ・ Female thread, 31 ・ ・ ・ Rolling blanket, 32 ・ ・ ・ Metal cylinder, 33 ・ ・ ・ Blanket Seat, 35: bearing, 36: pressing cylinder, 37: gear box, 38: motor, 41: pinion 42: rack.

Claims (3)

[Claims] 1. An offset printing machine for transferring ink provided on an intaglio to a rolling blanket and then transferring the transferred ink from the rolling blanket to a work, comprising: a moving table on which an intaglio and a work are held on an upper surface; A rolling blanket disposed above the moving table; a first driving mechanism for driving the moving table; a second driving mechanism provided independently of the first driving mechanism and driving the rolling blanket; An offset printing press, comprising: a numerical control controller that independently controls a first drive mechanism and a second drive mechanism. 2. The numerical controller includes: a setting input unit for inputting a set value of a moving speed of the moving table; and a correction input unit for inputting a correction value for finely adjusting a peripheral speed of the rolling blanket. A control signal corresponding to the set value is sent to the first drive mechanism, and a control signal corresponding to a value obtained by adding the correction value to the set value is sent to the second drive mechanism. The offset printing press according to claim 1, wherein the offset printing press is configured to feed. 3. The numerical controller includes: a setting input unit for inputting a set value of a peripheral speed of the rolling blanket; and a correction input unit for inputting a correction value for finely adjusting a moving speed of the moving table. A control signal corresponding to the set value is sent to the second drive mechanism, and a control signal corresponding to a value obtained by adding the correction value to the set value is sent to the first drive mechanism. The offset printing press according to claim 1, wherein the offset printing press is configured to feed.