JP2000218918A - Ink supplying controlling device for printing equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the ink supplying controlling device for a printing equipment, with which a favorable printing can be carried out by a method wherein an unnecessary waiting time required for supplying ink is omitted and an ink shortage is dissolved at low cost under the state that an inking pump is prevented from becoming large-sized. SOLUTION: In a printing equipment, within a printing drum 3 of which an inking pump 9 for supplying the ink in an ink vessel 10 and an ink detecting means 15 for detecting the amount of the ink within the printing drum 3 are equipped so as to perform printing actions in response to the set number of printing, a controlling means 7 controls the driving action of the inking pump 9 until the outputting of the ink shortage signal become zero when a printing action is started irrespective of a signal sent from the ink detecting means 15 at the starting pint of the printing action and, at the same time, a signal sent from the ink detecting means 15 at the finishing point of the printing action shows an ink shortage.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ink supply control device for supplying ink to a printing drum of a printing apparatus.

[0002]

2. Description of the Related Art In a printing apparatus, an ink pool is formed by a doctor roller and an ink roller inside a printing drum formed by winding a mesh screen around a porous supporting cylinder, and the ink pool is formed from the ink pool. The ink is conveyed to the inner peripheral surface of the printing drum via the. The conveyed ink is transferred from the outer peripheral surface of the printing drum to the surface of the conveyed printing paper through the hole of the master made by winding the same around the outer peripheral surface to form a printed image. I have. The ink supply to the ink reservoir is usually performed in a situation where the printing drum is rotating and the ink roller is also rotating by the suction and delivery operations of the ink pump from the ink container that is detachable from the printing drum and the printing device body. Will be This is to promote uniformity of the amount of ink in the ink pool in a direction parallel to the axis of the printing drum. Further, inside the printing drum, in order to keep the ink amount of the ink pool constant, an ink detecting means for detecting the ink amount is provided. Generally, a master wound around a printing drum has a synthetic resin film perforated and made by a plate making means and an ink-permeable Japanese paper base.

In such a printing apparatus, when a plate making means is provided, when a plate making start key for starting a plate making operation is depressed, a used master wound around a printing drum is first discharged by the plate discharging means. After discharging the plate, the newly formed master is wrapped around the outer peripheral surface of the printing drum by the plate making means, and thereafter, only one sheet of printing paper is fed from the paper feeding section, and ink is applied to the newly wound master. Familiar. The problem here is that the ink held on the mesh screen on the outer peripheral surface of the printing drum adheres to the used master at the time of plate discharging and is partially removed and discarded. Thus, when a new master is wound, it is necessary to supply the discarded ink and the ink for the newly wound master. As described above, at the time of plate discharging, plate feeding, and plate attaching, the consumption of ink is larger than at the time of printing, and at present, much more ink supply is required than at the time of printing.

As a result, immediately after the printing is performed, the amount of ink in the ink pool in the printing drum rapidly decreases. Therefore, the ink pump is normally driven thereafter, that is, at the time of printing after printing. It gradually supplies ink to the ink reservoir while printing.

However, since the drive source of the ink pump is the same as the rotary drive source of the print drum, ink supply can always be performed only when the print drum is rotating. For this reason, during plate discharging, plate making, and plate feeding, the printing drum does not rotate as frequently as during printing, but does not rotate occasionally. It was difficult to supply (supplement) to the city.

In such a printing apparatus, when plate discharging, plate feeding, and printing are repeatedly performed as in the case of repetitive printing of a small number of copies, the supply of ink to the ink reservoir due to the operation of the ink pump becomes imperceptible. . For this reason, a state in which the ink inside the print drum is temporarily insufficient may occur, and the image may be blurred and a good printed matter may not be obtained.

[0007] As a countermeasure, when the printing start key is pressed after completion of the printing, first, an ink supply operation to the ink pool is performed, and the ink detecting means detects that the ink in the ink pool has been sufficiently supplied. Therefore, there is a printer which performs a printing operation corresponding to the set number of prints. In the ink supply operation here, the printing drum is rotated while supplying ink by driving the ink pump,
The ink is supplied to the outer peripheral side of the printing drum.

[0008]

However, in the conventional ink supply system, a time for ink supply is provided even when the print start key is pressed, so that the printing operation does not start immediately, The ink supply is performed by the operation of the ink pump while the print drum idles, and the actual printing operation is started only after the operation is completed. Therefore, it takes a long time (more than 10 seconds in a long case) to supply the ink. There has been a problem that the time required for the first print and the waiting time of the operator for the printing become long.

If the operating speed of the ink pump is increased, such problems can be suppressed to some extent. However, a high output is required for the ink pump, which results in an increase in the size and cost of the motor. Will be invited. In addition, plate making speed itself has been increased due to recent technological advances, and it has become impossible to provide sufficient ink supply time for ink supply during plate making.

Further, without supplying ink immediately after printing, a plurality of originals are set in, for example, an automatic document feeder (ADF) to print 10 or less per original.
When the printing of a small number of copies is continuously performed, the ink supply by the operation of the ink pump is soon outpaced by the ink consumption, so that the image density is reduced and the blurred image is caused.

SUMMARY OF THE INVENTION The present invention provides an ink supply control device for a printing apparatus capable of eliminating an unnecessary waiting time for ink supply while suppressing ink enlargement while eliminating ink shortage at low cost and performing good printing. The purpose is to:

[0012]

SUMMARY OF THE INVENTION The present invention addresses the technical problem of how to solve the ink shortage at the time of printing or printing and focuses on the timing of ink supply to the inner peripheral surface of the plate cylinder. It was done.

According to a first aspect of the present invention, there is provided a printing apparatus having a printing drum and an ink pump for supplying ink in an ink container to the inside of the printing drum, and performing a printing operation according to a set number of prints. And a control means for controlling the driving of the ink pump when the printing operation is completed. For this reason, when the printing operation is completed, the ink pump is driven and controlled, and the ink amount is supplied into the printing drum. Therefore, before the next plate discharging operation, a sufficient amount of ink is supplied into the printing drum. Becomes

According to a second aspect of the present invention, there is provided a printing drum, an ink pump for supplying ink in an ink container to the inside of the printing drum, and an ink detecting means for detecting the amount of ink inside the printing drum. In a printing apparatus that performs a printing operation according to a set number of prints, a configuration is provided that includes a control unit that drives and controls an ink pump when a signal from the ink detection unit at the time when the printing operation is completed indicates a lack of ink. I have. Therefore, if the ink is insufficient at the end of the printing operation, the ink pump is driven to supply the ink in the ink container to the printing drum. A state in which sufficient ink has been supplied is obtained.

According to the third aspect of the present invention, the printing drum includes
A printing apparatus having an ink pump for supplying ink in an ink container to the inside of the printing drum and an ink detecting means for detecting the amount of ink inside the printing drum, and performing a printing operation according to a set number of prints In the case where the printing operation is started irrespective of the signal from the ink detecting means at the time when the printing operation is started and the signal from the ink detecting means at the time when the printing operation is completed indicates that the ink is insufficient, this ink is The control unit controls the driving operation of the ink pump until the output of the shortage signal disappears. Therefore, the printing operation is started regardless of the amount of ink in the printing drum, so that the conventional waiting time is eliminated and the ink in the ink container is supplied when the ink is insufficient at the end of the printing operation. Therefore, before the next plate discharging operation, a sufficient ink is supplied to the inside of the printing drum.

According to a fourth aspect of the present invention, in the ink supply control device for a printing apparatus according to the first, second or third aspect,
A driving unit for rotating the printing drum, and a stop key, wherein the control unit, if the stop key is pressed before the end of the printing operation, prints immediately regardless of the signal from the ink detection unit at that time. The driving operation of the driving means is controlled so as to stop the drum at a fixed position. For this reason, when the stop key is pressed, the rotation of the printing drum is stopped regardless of the printing status, and the intention of the operator is reflected, so that useless operation and trouble of the apparatus are eliminated.

According to the fifth aspect of the present invention, there is provided a rotatable printing drum around which a master is wound around an outer peripheral surface, and an ink pump for supplying ink in an ink container inside the printing drum. When is pressed, the used master wound around the print drum is discharged by plate discharging means,
In a printing device that supplies a new master made by the plate making means to the print drum and winds and rolls the plate, whether the print drum rotates during the period from when the plate making start key is pressed until plate printing is completed Irrespective of the above, a control means for controlling the driving operation of the ink pump at a predetermined number of times or time so as to supply the ink to the inside of the printing drum is provided. Therefore, when the plate making start key is pressed regardless of the rotation state of the printing drum, the ink in the ink container is supplied to the inside of the printing drum until the printing operation is completed. And the ink is supplied into the printing drum at the start of printing. In addition, since the driving operation of the ink pump at this time is controlled by a predetermined number or time, the ink supplied to the printing drum from the time when the plate making start key is pressed to the time when printing is completed is completed. Since the amount is supplied by an amount corresponding to the set rotation or time, it is possible to suppress occurrence of a problem due to excessive ink supply.

According to the present invention, a rotatable printing drum around which a master is wound around an outer peripheral surface, an ink pump for supplying ink in an ink container to the inside of the printing drum, and an inner peripheral surface of the printing drum An ink roller driving means for rotating an ink roller provided so as to come in contact with the plate, and when the plate making start key is pressed, the used master wound around the printing drum is discharged by the plate discharging means, and the plate making means In a printing machine that feeds and winds a new master made by the above-mentioned printing drum onto the above printing drum and applies the printing plate, the question of whether the printing drum is rotating after the press of the plate-making start key until printing is completed. In addition, an ink roller driving means and a control means for controlling the driving operation of the ink pump are provided to supply ink to the inside of the printing drum.
Therefore, if the plate-making start key is pressed regardless of the rotation state of the printing drum, ink is supplied from the ink pump until the printing operation is completed, and the ink is supplied in the axial direction by the rotation of the ink roller. Since the ink is uniformly dispersed and supplied to the inner peripheral surface of the print drum, a standby time for supplying the ink is eliminated, and the ink is supplied to the inner peripheral surface of the print drum at the start of printing.

[0019]

FIG. 1 shows a stencil printing apparatus as an example of a printing apparatus. The stencil printing apparatus includes a printing drum 3 on which a stencil-made master 6B (hereinafter, referred to as a "master 6B") wound and stenciled by a stencil making means 50 built in the apparatus, and a printing drum 3 Proximity /
A well-known press roller 22 as a pressing member provided detachably and a used master 6A (hereinafter referred to as a “master 6
A) is detached from the outer peripheral surface 3b of the printing drum 3 and discarded, and a control device 7 serving as a control unit is provided. Although not shown, the stencil printing apparatus includes a paper feed tray on which the printing paper 40 shown in FIG.
A paper discharge transport unit that transports the printed printing paper 40, a paper discharge tray that loads the printed printing paper 40, a well-known exposure scanning system and a CCD that optically reads an image of a document
And a document reading device having the same. As a stencil printing apparatus, a stencil making machine having this original reading device and stencil making means 50,
A stencil printing device having no plate making function may be used instead of the printing integrated printing device.

In the plate making means 50, a master 6B is produced by perforating a plate making image corresponding to a document image on an unplated master based on an image signal from a document reading device. When a document reading device is provided, an automatic document feeder (ADF) that automatically conveys a document to a document reading unit may be provided. Further, the plate making means 50 may make a plate based on an image signal from an external input / output device such as a personal computer. In the present embodiment, a period from the start to the end of the heat perforation is defined as a plate making operation.

The printing drum 3 is formed by winding a mesh screen of a resin or metal mesh in a multi-layer around the outer periphery of a porous support cylinder, and is rotatable about a central axis (not shown). The printing drum 3 is connected to a speed-adjustable main motor 21 as a driving means of the printing drum via a pulley (not shown) and a belt 23, and is rotated clockwise in this embodiment. In the vicinity of the main motor 21, a rotation detection sensor 71 as drum rotation detection means for detecting the presence or absence of rotation of the printing drum 3 is arranged.

One of the plate feeding rollers 19 and 20 is configured as a driving roller and the other as a driven roller, and is configured to be rotationally driven by a plate feeding driving unit (not shown) from the time of the plate making operation to the end of the plate feeding operation. Have been. For this reason, the master 6B made by the plate making means 50 receives the master supply roller 1
9 and 20, the leading edge of the printing drum 3 is gripped by a clamper 12 provided on the printing drum 3 and cut to a predetermined length by a cutting device (not shown). 3b. In the present embodiment, the master 6B that has been made is used as the plate feeding rollers 19 and 20.
The plate feeding operation is performed until the sheet is conveyed by the clamper 12 and is gripped by the clamper 12.
Until the winding on b is completed, the winding operation is performed.

The plate discharging means 70 is disposed on the left side of the printing drum 3 in FIG. 1 and is driven to rotate while being pressed against each other.
And a plate discharging box 18 for accommodating the master 6A which is peeled off from the outer peripheral surface 3b of the printing drum 3. The plate discharging rollers 4 and 5 are provided so as to be able to contact and separate from the outer peripheral surface 3b of the printing drum 3 by a moving mechanism and a plate discharging driving unit (not shown). The rear end of the master 6A wound around the master 6A is held between the pair of rollers and transported to the plate discharge box 18. At the time of plate discharging, the printing drum 3 is rotated at a lower speed than the printing speed, and the clamper 1 is rotated.
2 is also released, and the master 6A is moved to the outer peripheral surface 3b of the printing drum 3.
And is discarded. In this embodiment,
A series of operations from when the plate discharge rollers 4 and 5 come into contact with the outer peripheral surface 3b of the printing drum 3 to peel the wound master 6A from the outer peripheral surface 3b and store it in the plate discharge box 18 are referred to as a plate discharge operation. I do. The fixed position of the printing drum 3 in the present embodiment indicates a home position where the clamper 12 is located almost directly above the printing drum 3.

Inside the printing drum 3, an ink roller 3 is provided.
0 and a doctor roller 24 arranged at a slight distance from the outer peripheral surface of the ink roller 30. An ink pool 14 is formed in a wedge-shaped space between the ink roller 30 and the doctor roller 24. Ink roller 30
Is rotatably supported between a pair of flanges of the printing drum 3 (not shown), and is driven to rotate in the same direction as the printing drum 3 in synchronization with the printing drum 3 by a well-known gear or belt serving as power transmission means (not shown). The ink in the ink pool 14 is formed into an elongated columnar shape while spreading between the ink roller 30 and the doctor roller 24 while flowing by the rotation of the ink roller 30, and is necessary for printing via the outer peripheral surface of the ink roller 30. An appropriate amount of ink is supplied to the inner peripheral surface 3a of the printing drum 3.

The ink in the ink container 10 is supplied to the ink reservoir 14 from a supply port 9 a of the ink pump 9 by an ink pump 9 driven by an ink pump motor 8. An ink container 10 is provided in the ink pump 9.
It is set so as to be in close contact with the base 10a.
Above the ink reservoir 14, an ink sensor 1 as an ink detecting means for detecting the amount of ink in the ink reservoir 14 is provided.
5 are provided. The ink sensor 15 is of a stylus type that detects the amount of ink by contacting the ink of the ink reservoir 14, and is turned on when the ink reservoir 14 becomes low and the contact between the stylus and the ink stops, and an ink shortage signal is output. Is output.

The press roller 22 is disposed at a position opposed to the ink roller 30 and is provided so as to be able to freely contact and separate from the outer peripheral surface 3b of the print drum 3 by a contact / separation mechanism (not shown). A printing portion is formed between the outer peripheral surface 3b and the outer peripheral surface 3b. The press roller 22 is moved by the contact / separation mechanism so as to occupy a position separated from the outer peripheral surface 3b of the printing drum 3 when the clamper 12 passes through the printing section during plate printing and printing, or during plate discharging, plate making, and plate feeding. Be operated.

The plate attaching operation in the present embodiment means that after the master 6B is wound around the print drum 3 in the plate feeding and winding operations, only one print sheet 40 is passed through the printing section as shown in FIG. , One rotation of the printing drum 3.

As shown in FIG. 1, a stencil start key 2 for starting a stencil operation is provided on an operation panel 1 of the stencil printing machine.
A numeric keypad 11 for inputting and setting a predetermined number of prints; a print start key 13 for starting a printing operation (actual printing operation) for the predetermined number of prints; a stop key 17 for stopping each operation; A counter display section 16 for displaying the number of remaining prints is provided. The plate making start key 2, numeric keypad 11, print start key 13, counter display section 16, and stop key 17 are each electrically connected to the control device 7 and transmit and receive various signals to and from the control device 7. ing.

The main part of the control device 7 is composed of a known microcomputer, and various operation programs are stored in a memory (not shown). In this embodiment, when the plate making start key 2 is pressed and turned on, the plate discharging,
When a series of operations up to plate making, plate feeding, and printing are started, and the print start key 13 is pressed and turned on, a printing operation for the set number of prints is started.

Hereinafter, the control operation of the present invention will be described. FIG.
9 is a flowchart illustrating ink supply control at the time of a printing operation performed after the printing operation. In FIG. 3, after the printing operation is completed, the operator inputs the set number of prints using the numeric keypad 11 and then presses the print start key 13. In step A1, regardless of the amount of ink in the ink pool 14, the paper feed operation and the drum operation are performed. Execute the rotation actual printing operation. Here, the main motor 21 is driven to rotate the printing drum 3 and the press roller 22 is brought into and out of contact at a desired timing while feeding the printing paper 40 from the paper feeding unit (not shown) toward the printing unit. Printing is performed on the printing paper 40. When the printing operation is executed, the number of remaining prints displayed on the counter display section 16 is counted down, and if the stop key 17 is not pressed in step A2, step A
Then, the printing operation is performed until the number (the number of remaining prints) of the counter display section 16 becomes “0”, that is, until the printing corresponding to the input set number of prints is completed.

When the value of the counter display section 16 becomes "0" in step A3, it is determined that the printing operation has been completed.
Proceeding to step A4, the amount of ink in the ink pool 14 is determined based on a signal from the ink sensor 15. At this time, if the ink in the ink reservoir 14 is sufficient and the ink sensor 15 detects that the ink is present, step A
In step 5, the ink supply operation is not performed, the drive of the main motor 21 is controlled to stop the printing drum 3 at the home position, and the printing operation of the printing apparatus is stopped to end the control.

In step A4, when the ink in the ink reservoir 14 is low and the ink sensor 15 detects an ink shortage signal, the process proceeds to step A6, where the main motor 21 is driven to rotate the printing drum 3 and the ink pump 9 is operated. The ink pump motor 8 is driven to
Is supplied to the ink reservoir 14. This ink supply operation is continued until there is no ink shortage signal from the ink sensor 15, and stops when sufficient ink is supplied to the ink reservoir 14. Further, when the stop key 17 is pressed in step A2, the printing operation and the ink supply operation are not performed, but the rotation of the printing drum 3 is stopped immediately to position the printing drum 3 at the home position, and the printing operation is also stopped. To end the control.

By controlling the printing apparatus in this way, the printing operation is started irrespective of the amount of ink in the ink pool 14, which is the amount of ink inside the printing drum 3, so that the waiting time before the printing operation is eliminated. The time to first print can be hastened. If the ink in the ink pool 14 is insufficient after the printing operation, the ink is supplied from the ink pump 9 and the print drum 3 rotates until the ink in the ink pool 14 has a sufficient ink amount. In addition, the printing apparatus does not stop when the ink in the ink pool 14 is not sufficient at the end of the printing operation.
Therefore, before the plate discharging operation, a sufficient ink is supplied to the inside of the printing drum 3, and the ink pump 9 and the ink pump motor 8 do not need to be increased in size, thereby suppressing an increase in cost.

After the printing operation is completed, only the rotation of the printing drum 3 and the operation of the ink pump 9 continue, but the printing for the set number of prints has already been completed in step A3. , And the waiting time for the entire printing by the operator can be reduced.

The master 6B wound around the printing drum 3
The printing operation is terminated even when the number of prints for the original is small, that is, the number of prints per original is small (10 or less). Since the ink is supplied until the ink in the ink pool 14 becomes a sufficient amount later, sufficient ink is always secured in the ink pool 14 before the next plate discharging operation is started. Even if printing of a small number of copies with a small number of prints is repeated, it is possible to prevent a print image from becoming a book.

In this embodiment, the printing operation is started regardless of the signal from the ink sensor 15 at the time when the printing operation is started.
The printing operation may be started when there is an ink detection signal from. Further, the ink pump 9 is operated when the signal from the ink sensor 15 at the time when the printing operation is completed indicates the ink shortage. However, regardless of the presence or absence of the ink shortage signal from the ink sensor 15, the printing operation is completed. Then, the ink pump 8 may be operated to supply (supply) a predetermined amount of ink to the ink reservoir 14. Alternatively, the ink supply to the ink pool 14 is not performed at the end of the printing operation, but when the printing operation is completed. The ink pump 9 can be supplied from the time before the end of the printing operation which can be supplied.
May be operated to perform the ink supply operation.

FIG. 4 is a flowchart showing another control mode of the present invention. In this control mode, from when the plate making start key 2 is pressed to when printing is completed, regardless of whether the printing drum 3 is rotating, that is, even if the printing drum 3 is rotating, The control device 7 controls the driving operation of the ink pump 9 so as to supply ink to the inside of the printing drum 3.

In FIG. 4, when the operator presses the plate making start key 2 on the operation panel 1, the plate discharging operation is performed in step B1, the plate making operation is performed in step B2, the plate feeding and winding operation of the master 6B is performed in step B3, B
In step B4, an ink replenishment (supply) operation is performed in step B12 in parallel with the plate mounting operations.

In the plate discharging operation, the main motor 21 is driven to rotate the printing drum 3 more slowly than at the time of printing, and the plate discharging rollers 4 and 5 are also rotated to carry out the plate discharging and peeling of the master 6A. In the plate making operation, a document reading by a document reading device (not shown) and a plate making perforation operation by a thermal head to an unplated master are performed substantially simultaneously with the plate discharging operation. In the plate feeding and winding operations, while the master 6B is being conveyed by the plate feeding rollers 19 and 20, the clamper 12 is opened and closed to hold the leading end of the master 6B, and the printing is performed with the rotation of the printing drum 3 driven by the main motor 21. The master 6B is wound around the outer peripheral surface 3b of the drum 3, and cut into a predetermined length. In the printing operation, as shown in FIG.
The ink is adapted to the master 6 </ b> B wound by feeding and winding only the sheets, and the image is transferred to the printing paper 40.

In the ink supply (supply) operation executed in step B12, when the plate making start key 2 is pressed,
The ink pump motor 8 is driven by a command from the control device 7 to operate the ink pump 9, thereby performing an initial ink supply operation. This ink supply operation is performed regardless of the rotation of the printing drum 3. Be executed. This execution period is a period from the moment when the plate making start key 2 is pressed to after the plate making operation. Whether or not the printing drum 3 is rotating may be determined by the control unit 7 based on an on / off signal to the main motor 21 or a rotation detecting sensor 71 is provided as shown in FIG. May be detected, or the rotation of the printing drum 3 may be directly detected.

When the printing operation is completed, the driving of the main motor 21 is stopped in step B5, and the printing drum 3 is stopped at the home position. Here, the operator confirms the printed matter discharged at the time of printing, and if the printed matter is in a desired printing state, inputs a predetermined number of prints with the ten keys 11 and presses the print start key 13 in step B6 to turn on the printed matter. Then, the printing operation for the predetermined number of prints is started in step B7, and step B8
Then, the ink amount of the ink pool 14 is detected by the ink sensor 15. And if the ink is not enough, step B
In step 9, the ink pump motor 8 is driven until there is no ink shortage signal from the ink sensor 15, and the ink in the ink container 10 is stored in the ink reservoir 14 by the ink pump 9.
When there is no ink shortage signal from the ink sensor 15, the operation of the ink pump motor 8 is stopped, the operation of the ink pump 9 is stopped, and the ink supply operation is terminated.

When the printing operation is started in step B7, the process proceeds to step B10 until the value (remaining number of prints) of the counter display section 16 becomes "0", that is, until printing corresponding to the set number of prints is completed. When the printing operation is performed and the numerical value (remaining number of prints) of the counter display section 16 becomes “0”, the printing is ended in step B11 and this control is ended.

As described above, regardless of whether the printing drum 3 is rotating or not, the ink supply is forcibly started from the moment when the plate making start key 2 is pressed, regardless of the amount of ink in the ink pool 14 at that time. By supplying ink continuously until the end of printing, sufficient ink is discharged from the ink reservoir 14 during printing, wrapping, and wrapping, which consume a lot of ink.
Can be supplied to Therefore, even when printing a small number of copies, a sufficient amount of ink can be supplied to the ink reservoir 14 until the end of the printing operation, so that a problem in which printed images are not stored can be suppressed. Further, when the amount of ink in the ink pool 14 becomes small during the printing operation, the ink is supplied, so that the shortage of the ink during the printing operation can be eliminated, and a good printed matter can be obtained.

By controlling in this manner, the conventional ink supply operation performed before the printing operation executed after the print start key 13 is pressed is eliminated, so that there is no waiting time before the printing operation. Since the printing operation starts immediately when the print start key 13 is pressed, the time until the first printing can be shortened as compared with the conventional one.

FIGS. 5 and 6 show still another embodiment of the present invention. In this embodiment, members having the same functions as those of the above-described embodiments are given the same reference numerals, and detailed description thereof will be omitted. In this embodiment, the main motor 2
A dedicated ink roller driving motor 34 (hereinafter referred to as “ink motor 34”) serving as a dedicated ink roller driving means is provided to rotate the ink roller 30 provided inside the printing drum 3 separately from the printing roller 3. I have.

The configuration of the printing apparatus is as follows.
Since the configuration is the same as that shown in FIG. 1 except for the configuration near 0, here, only the configuration near the ink roller 30 will be described with reference to FIG. The printing drum 3 has a disk-shaped flange 25 fixed to the porous support cylinder. The flange 25 is connected to the main motor 21 shown in FIG.
Are driven to rotate around a central axis 26 provided at the center. The rotation of the flange 25 is performed normally, that is, when the print drum 3 is rotated, the gear 27 provided on the flange 25 and the gear 29 provided on the shaft 31 of the ink roller 30, and the gear 27,
The light is transmitted to the ink roller 30 by the gear 28 meshing with the gear 29. Thereby, the ink roller 30 rotates in the same direction as the printing drum 3.

A timing pulley 33 is provided on a part of the shaft 31 of the ink roller 30 via a one-way clutch 32. A timing belt 36 is stretched between the timing pulley 33 and a timing pulley 35 provided on an output shaft of the ink motor 34, and is configured to transmit a rotational driving force from the ink motor 34. I have. When the shaft 31 is rotated by the rotation of the printing drum 3, the one-way clutch 32
When the rotational driving force is transmitted to the timing pulley 33 from the ink motor 34 side, the timing pulley 33 is locked to rotate integrally with the shaft 31. Further, the ink motor 34 is connected to the control device 7. With such a configuration, the ink roller 30 can rotate independently of the rotation of the printing drum 3. That is, the ink roller 30 can be driven to rotate by driving the ink motor 34 regardless of the presence or absence of rotation of the flange 25.

FIG. 6 is a flowchart showing a form of control relating to ink supply of the printing apparatus having the ink motor 34. In FIG. 6, steps C1 to C5 and C6
Has the same contents as steps B1 to B5 and B12 shown in FIG. 4, and a detailed description thereof will be omitted. In other words, in this control mode, between the time when the plate making start key 2 is pressed and the time when the plate making operation of step C4 is completed, the instant when the plate making start key 2 is pressed regardless of the rotation of the printing drum 3. Then, regardless of the presence or absence of the ink amount in the ink pool 14 at that time, the ink motor 34 is rotationally driven in step C7, and the ink supply to the ink pool 14 is forcibly started in step C6 until the printing operation is completed. The ink supply will be continued. As a result, plate discharging, plate feeding winding,
A sufficient amount of ink can be supplied to the ink reservoir 14 at the time of printing. Therefore, even when printing a small number of copies, a sufficient amount of ink can be supplied to the ink reservoir 14 until the end of the printing operation, and the problem that printed images are not printed can be suppressed.

If the printing operation and the ink supply operation from step B6 to step B11 shown in FIG. 4 are performed after step C5 in FIG. 6, the amount of ink in the ink pool 14 becomes small during the printing operation. Even in such a case, ink can be supplied, so that ink shortage at the time of printing operation can be eliminated, and a good printed matter can be obtained. Therefore, since the ink supply operation conventionally performed after the print start key 13 is pressed is eliminated, the waiting time before the printing operation is eliminated, and the time until the first printing can be reduced.

Before executing the control shown in FIG. 3, steps B1 to B5 and B11 shown in FIG.
Alternatively, steps C1 to C7 shown in FIG. 6 may be executed. However, to execute steps C1 to C7, it is necessary to add the configuration shown in FIG.

Here, the ink supply amount will be described.
Since the above-described ink pump 9 includes the dedicated ink pump motor 8, the ink pump 9 can be driven by the ink pump motor 8 even when the printing drum 3 is not rotating during plate discharging, plate making, and plate feeding. Thus, ink supply to the ink pool 14 can be performed. However, even in this case, if the ink roller 30 is not rotating, as shown in FIG.
In the vicinity of the ink reservoir 14 and the supply port 9a, the ink mass 50
Will be. In this case, even if the ink is supplied, the ink sensor 15 cannot accurately detect the ink amount, and even if the ink roller 30 is rotated after the generation of the ink mass 50, the flow of the ink is hindered.

For this reason, even when the ink pump motor 8 is driven when the printing drum 3 rotates only occasionally during plate discharging, plate making and plate feeding, the ink pump motor 8 is driven until the ink sensor 15 becomes full of ink. Instead, the driving time and the number of times of the ink pump 9 that can supply the ink without generating the ink mass 50 as described above are set in advance, and the ink pump 9 is operated for the set time and the number of times. It is good to drive control.

For example, in the case where the ink pump 8 can supply about 5 g of ink in one reciprocating operation, if about 5 g of ink can be normally supplied (supplied) to the ink reservoir 14, FIG.
As shown in (b), the ink supplied does not cause the formation of the ink mass 50 around the ink pool 14 and the supply port 9a. Therefore, during plate discharging, plate making and plate feeding,
Regardless of the amount of ink in the ink pool 14 or the presence or absence of rotation of the printing drum 3, the ink pump 9 only needs to be operated by one reciprocating operation.

[0054]

According to the first aspect of the present invention, when the printing operation is completed, the driving of the ink pump is controlled to supply the ink amount into the printing drum, and the printing drum is supplied before the next plate discharging operation. Since a sufficient amount of ink is supplied to the inside of the printer, the size of the ink pump can be suppressed and unnecessary standby time for ink supply can be eliminated.

According to the second aspect of the invention, when the ink is insufficient at the end of the printing operation, the ink pump is driven to supply the ink in the ink container to the printing drum, and the next plate discharging operation is performed. Before operation, sufficient ink is supplied to the inside of the printing drum, eliminating unnecessary standby time required for ink supply while suppressing the size of the ink pump. Printing.

According to the third aspect of the present invention, the printing operation is started irrespective of the amount of ink in the printing drum, so that the conventional waiting time is eliminated and the ink is insufficient at the end of the printing operation. Since the ink in the ink container is supplied, before the next plate discharging operation, a sufficient amount of ink is supplied inside the printing drum, and unnecessary waiting time required for ink supply while keeping the ink pump large is suppressed. And eliminates ink shortage at low cost to achieve good printing.

According to the invention set forth in claim 4, according to claim 1,
In the ink supply control device of the printing apparatus described in 2 or 3, when the stop key is pressed, the rotation of the printing drum is stopped regardless of the printing condition, so that sufficient ink is left inside the printing drum before the plate discharging operation. In this state, the ink pump is kept large, the unnecessary waiting time required for ink supply is eliminated, ink shortage can be eliminated at low cost, and good printing can be performed. Operation is lost.

According to the fifth aspect of the invention, when the plate making start key is pressed regardless of the rotation state of the printing drum,
Since the ink in the ink container is supplied to the inside of the printing drum until the printing operation is completed, the waiting time for the ink supply is eliminated, and the ink is supplied to the inside of the printing drum at the start of printing. State
It is possible to eliminate unnecessary ink waiting time required for ink supply while suppressing an increase in the size of the ink pump, eliminate ink shortage at low cost, and perform good printing. Further, since the driving operation of the ink pump is controlled by a predetermined number or time,
The amount of ink supplied to the print drum during the period from when the plate-making start key is pressed to when the printing is completed is supplied by an amount corresponding to the set number of times or time, and excessive ink supply is performed. The occurrence of defects can be suppressed.

According to the sixth aspect of the present invention, when the plate making start key is pressed regardless of the rotation state of the printing drum,
Until the printing operation is completed, ink is supplied from the ink pump, and the ink is uniformly dispersed in the axial direction by the rotation of the ink roller and is supplied to the inner peripheral surface of the printing drum. In addition to eliminating standby time for supply, ink is supplied to the inner peripheral surface of the printing drum at the start of printing, and unnecessary standby time for ink supply is eliminated while suppressing the size of the ink pump. Good printing can be performed by eliminating ink shortage during printing of a small number of copies.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an ink supply control device of a printing apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram illustrating a paper passing state of printing paper.

FIG. 3 is a flowchart illustrating one form of control by an ink supply control device.

FIG. 4 is a flowchart illustrating another form of control by the ink supply control device.

FIG. 5 is a partially enlarged sectional view showing a modification of the configuration near the ink roller.

FIG. 6 is a flowchart showing a form of control performed by an ink supply control device of the printing apparatus having the configuration shown in FIG.

FIG. 7A is an enlarged view showing a problem in the ink pool, and FIG. 7B is an enlarged view showing a state in which the problem of the ink pool is solved.

[Explanation of symbols]

 2 Plate Making Start Key 3 Printing Drum 3a Inner Surface of Printing Drum 3b Outer Surface of Printing Drum 6A Used Master 6B New Master (plate Making Master) 7 Control Means 9 Ink Pump 10 Ink Container 15 Ink Detecting Means 17 Stop Key 21 Printing drum driving means 30 Ink roller 34 Ink roller driving means 50 Plate making means 70 Plate discharging means

Claims (6)

[Claims] An ink pump for supplying ink in an ink container to the inside of the printing drum;
An ink supply control device for a printing apparatus, comprising: a printing unit that performs a printing operation in accordance with a set number of prints, the control unit configured to drive and control the ink pump when the printing operation is completed. 2. A printing apparatus comprising a printing drum, an ink pump for supplying ink in an ink container to the inside of the printing drum, and ink detecting means for detecting an amount of ink inside the printing drum. A printing apparatus that performs a printing operation according to the number of sheets, comprising a control unit that drives and controls the ink pump when a signal from the ink detection unit at the time when the printing operation is completed indicates a lack of ink. Ink supply control device for printing equipment. 3. A printing press having a printing drum, an ink pump for supplying ink in an ink container to the inside of the printing drum, and an ink detecting means for detecting an amount of ink inside the printing drum. In a printing apparatus that performs a printing operation according to the number of sheets, the printing operation is started regardless of a signal from the ink detection unit at the time when the printing operation is started, and the ink detection is performed when the printing operation is completed. An ink supply control device for a printing apparatus, further comprising control means for controlling the driving operation of the ink pump until the output of the ink shortage signal disappears when the signal from the means indicates the ink shortage. 4. An ink supply control device for a printing apparatus according to claim 1, further comprising: a drive unit for rotating said printing drum; and a stop key, wherein said control unit terminates said printing operation. If the stop key has been pressed before, the driving operation of the driving unit is controlled to immediately stop the printing drum at a fixed position regardless of a signal from the ink detecting unit at that time. Ink supply control device for printing equipment. 5. A printing drum having a rotatable printing drum around which a master is wound around an outer peripheral surface thereof, and an ink pump for supplying ink in an ink container inside the printing drum. In a printing apparatus in which a used master wound around a drum is discharged by a plate discharging means, and a new master made by the plate making means is fed to the printing drum and wound and printed, the plate making start key is pressed. From the time when the printing is completed to the time when the printing is completed, the driving operation of the ink pump is performed at a predetermined number of times or a time to supply ink to the inside of the printing drum regardless of the rotation of the printing drum. An ink supply control device for a printing apparatus, comprising a control unit for controlling the ink supply. 6. A rotatable printing drum around which a master is wound on an outer peripheral surface, an ink pump for supplying ink in an ink container to the inside of the printing drum, and an inner peripheral surface of the printing drum. An ink roller driving means for driving the provided ink roller to rotate, and when the plate making start key is pressed, the used master wound around the printing drum is discharged by the plate discharging means, and the plate is made by the plate making means. In a printing device that feeds and winds a new master on the printing drum and applies the printing plate, the question from the pressing of the plate making start key to the completion of printing is the same, regardless of whether the printing drum is rotating or not. A printing apparatus, comprising: an ink roller driving means for supplying ink to a printing drum; and a control means for controlling a driving operation of the ink pump. Niki supply control device.