JPH0715341U - Screen printing machine - Google Patents

Abstract

(57) [Abstract] [Purpose] In screen printing, ink bleeding on the back surface of a screen printing plate can be automatically removed and cleaned, and the efficiency of print application work is improved. [Structure] A squeegee mechanism 2 and a doctor mechanism 5 are mounted on a squeegee unit 1 that reciprocates on a screen printing plate S on a work W. In the squeegee mechanism 2, the left and right mounting means 11 mounted on the squeegee pipe 4, and the holder base 14 mounted between the left and right mounting means 11 and moved up and down by the lifting cylinders 17 of the mounting means 11, respectively. A blank printing mechanism 10 including a fixed blank printing squeegee 21 is attached. The blank squeegee 21
The ink K is transferred onto the dummy paper P arranged on the back surface of the screen printing plate S by pressing and rubbing on the screen printing plate S.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a screen printing machine, and more particularly, to a screen capable of removing bleeding and the like generated on a screen printing plate when automatically performing a series of processes such as positioning, feeding, printing coating, and discharging of a printing material. Regarding printing machines.

[0002]

[Prior art]

 For example, in a fully automatic screen printing machine that automatically performs a series of processes such as positioning, loading, printing application of emulsion, etc. of various printed materials (workpieces) such as printed circuit boards, discharge, etc. When the squeegee running on the screen printing plate is used to print on the set printing material, if this is repeated multiple times, bleeding will occur on the screen printing plate. This bleeding is caused by the phenomenon that the ink flows out to the back surface of the screen printing plate outside the portion where the ink passes, that is, the ink wraparound phenomenon.

When such ink bleeding occurs, the work is temporarily stopped, and the wraparound ink adhering to the back surface of the screen printing plate is cleaned and removed.

[0004]

[Problems to be solved by the device]

 However, the temporary interruption of the work for removing and cleaning the spilled ink not only makes the automatic continuous processing of all processes impossible, but also because the removal and cleaning is manual work, it is extremely troublesome. It was a thing.

Therefore, the present invention has been devised in view of the above-mentioned various existing circumstances, and is mainly applied to the back surface of the screen printing plate in a fully automatic screen printing machine that automatically performs a series of printing processes. It is an object of the present invention to provide a screen printing machine capable of automatically removing and cleaning the generated ink bleeding and improving work efficiency.

[0006]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, in the present invention, the squeegee 3 of the squeegee unit 1 that reciprocates on the screen printing plate S arranged on the substrate (W) is rubbed so that the substrate (W ), A blank printing mechanism 10 having a vertically movable blank squeegee 21 for pressing and rubbing the screen printing plate S on a dummy paper P arranged on the back surface of the screen printing plate S is additionally provided. It is characterized by having done.

The blank printing mechanism 10 is mounted between the left and right mounting means 11 detachably mounted on the squeegee unit 1 and the left and right mounting means 11, and the lifting means arranged in each of the mounting means 11. The holder base 14 is moved up and down by (17), and the blank printing squeegee 21 is detachably fixed to the holder base 14.

[0008]

[Action]

 In the screen printing machine according to the present invention, for example, when a series of printing processes such as positioning, loading, printing application, and discharging of the printing material (W) are automatically processed, When a suitable number of dummy papers P are placed on the back surface of the screen printing plate S, the blank printing mechanism 10 is operated under the control of the dummy paper P and the blank printing squeegee is operated by the operation of the elevating means (17). 21 is moved up and down.

When the blank printing squeegee 21 travels together with the squeegee unit 1 in a lowered state, it is rubbed on the screen printing plate S, and the ink K adhering to the back surface of the screen printing plate S is transferred and attached onto the dummy paper P. Let This transfer and adhesion serves to remove and clean the ink K on the back surface of the screen printing plate S. After the removal and cleaning, the blank printing squeegee 21 is returned to its original position and the printing operation is restarted.

[0010]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In the drawings, reference numeral 1 is a squeegee unit in a screen printing machine, and the squeegee unit 1 in the drawing is set on a printing table. The squeegee mechanism 2 having a squeegee 3 that descends during printing to rub against the screen printing plate S surface and the squeegee 3 that descends and advances toward the squeegee 3 when returning ink to the workpiece W that has been printed. After coming into contact with the squeegee 3, there is provided a doctor mechanism 5 having a scopper 6 that scoops up to scoop up the ink K (see FIG. 1).

Further, the squeegee unit 1 is provided with a blanking mechanism 10 including a blanking squeegee 21 that can be raised and lowered and that is arranged substantially parallel to the squeegee 3 in the squeegee mechanism 2. The twin squeegee structure is formed by arranging the squeegee unit 1 in pairs along the front and rear in the traveling direction. The blank printing mechanism 10 is mounted between the left and right mounting means 11 which are detachably mounted on the squeegee pipe 4 of the squeegee mechanism 2 and the left and right mounting means 11, and is arranged at each of the mounting steps 11. It comprises a holder base 14 which is lifted and lowered by the mounted lifting means (17), and a blank printing squeegee 21 which is detachably fixed to the holder base 14.

The mounting means 11 is a unit holder 12 that surrounds and holds a square pipe-shaped squeegee pipe 4, and a lock screw 13 is screwed in such a manner that the lock screw 13 can be moved back and forth. The lock screw 13 is tightened and loosened to the squeegee pipe 4. It can be fixed and detached (see Fig. 2).

The holder base 14 is mounted and fixed between the left and right slide plates 16 which are vertically slid and guided by guide means 15 which are integrally formed with the unit holders 12 of the left and right mounting means 11, respectively. The cross section of the downward opening has a groove shape. Further, since the slide plate 17 is connected to the floating stay 19 which is connected to the cylinder rod of the lifting cylinder 17 fixed to the unit holder 12 through the floating joint 18, the holder base 14 is lifted and lowered by the operation of the lifting cylinder 17. It is supposed to be done.

The blank printing squeegee 21 is made of the same material as the squeegee 3, and is sandwiched between the front and rear strip-shaped squeegee holders 22A and 22B each having a recess at the lower end edge. The squeegee 3 is held in a state, and its lower end edge is set to a position slightly higher than the lower end edge of the squeegee 3 when it is in the ascending position by the elevating means (17). Then, for example, the upper part of the front squeegee holder 22A is inserted into the holder base 14, and the squeegee clamp screw 23 screwed forward and backward from the front part of the holder base 14 is screwed and pressed to hold the holder. It is supported by the base 14.

Further, the blank printing mechanism 10 is configured such that when the squeegee unit 1 itself travels to continuously apply the print coating on a predetermined work W, or when it becomes possible to cause bleeding, for example, the print coating 50 is performed. When the dummy paper P is set on the work W and is carried in when it is repeated about a number of times, it is operated. That is, when the dummy paper P is carried in together with the work W, the blank printing squeegee 21 descends and runs to rub against the surface of the screen printing plate S, whereby the ink K on the back surface of the screen printing plate S becomes a dummy paper. It is transferred onto P, and the cleaning and removal operation by this transfer is controlled to be repeated a plurality of times if necessary.

Next, an example of the operation of this will be described. For example, when automatically processing a series of printing steps such as positioning, loading, print coating, and discharging of the work W, the appropriate work W to be loaded is selected. The dummy papers P are set for every number, and when the dummy papers P are loaded together with the work W, the blank printing mechanism 10 is controlled so as to operate.

That is, when the dummy paper P is put on the lower surface of the screen printing plate S, as shown by the alternate long and short dash line in FIG. 1, and in the state where the blank printing squeegee 21 is lowered by the lifting cylinder 17, as shown in FIG. The squeegee unit 1 is run. As the blank printing squeegee 21 rubs on the screen printing plate S due to the traveling, the ink K adhering to the back surface of the screen printing plate S is transferred onto the dummy paper P to remove the ink K. Cleaning is done. After the removal and cleaning, the blank printing squeegee 21 returns to its original position and waits for the next operation, while the discharged dummy paper P on the work W is removed appropriately. Then, as before, the squeegee 3 is lowered to perform the printing operation, and the scoper 6 is lowered to perform the ink leveling (ink returning) operation.

[0018]

[Effect of device]

 Since the present invention is configured as described above, for example, in a fully automatic screen printing machine that automatically performs a series of printing and coating processes on various kinds of printed materials (W), blank printing is performed for each appropriate quantity. Since the bleeding of the ink K on the back surface of the screen printing plate S can be automatically removed and cleaned, it is not necessary to interrupt a series of printing processing operations to improve the work efficiency. It is very useful.

That is, this means that the present invention provides a blank printing mechanism 10 having a vertically movable blank printing squeegee 21 for pressing and rubbing the screen printing plate S against the dummy paper P arranged on the back surface of the screen printing plate S. This is because it is attached, so that it is not necessary to interrupt the series of operations in which the printing and coating process is performed automatically.

The blanking mechanism 10 itself is mounted between the left and right mounting means 11 to be mounted on the squeegee unit 1 and the left and right mounting means 11, and the lifting and lowering means ( Since the holder base 14 is moved up and down by 17) and the blank printing squeegee 21 is fixed to the holder base 14, the lifting control can be surely performed by an instruction to the lifting means (17). The lifting operation is extremely smooth.

[Brief description of drawings]

FIG. 1 is a front sectional view of an embodiment of the present invention.

FIG. 2 is likewise a front sectional view of a main part.

FIG. 3 is a partially cutaway plan view of the same.

FIG. 4 is a partially cutaway side view of the same.

[Explanation of symbols] K ink P dummy paper S screen printing plate W work 1 squeegee unit 2 squeegee mechanism 3 squeegee pipe 5 doctor mechanism 6 scooper 10 blank printing mechanism 11 mounting means 12 unit holder 13 lock screw 14 holder base 15 guide means 16 Slide Plate 17 Lifting Cylinder 18 Floating Joint 19 Floating Stay 21 Blank Squeegee 22A, 22B
Squeegee holder 23 Squeegee clamp screw

Claims (2)

[Scope of utility model registration request] 1. A screen printing machine, wherein a squeegee of a squeegee unit that reciprocates on a screen printing plate disposed on a material to be printed rubs to apply printing to the surface of the material to be printed. 1. A screen printing machine characterized by being provided with a blank printing mechanism having a blank printing squeegee that can freely move up and down by pressing and rubbing a screen printing plate on a dummy paper arranged in. 2. A blank printing mechanism is mounted between left and right mounting means detachably mounted on a squeegee unit, and is mounted between the left and right mounting means, and is lifted and lowered by lifting means arranged in each mounting means. The screen printing machine according to claim 1, comprising a holder base and a blank squeegee detachably fixed to the holder base.