JPS6119364A - Screen printing method and device for square-cylindrical work - Google Patents

Abstract

PURPOSE:To print a pattern continuing to two surfaces containing a ridge section by turning a work while using a section in the vicinity of the ridge section as the center of revolution when a squeegee is moved and approaches to the ridge section. CONSTITUTION:A screen printing plate 5 is lowered, and the printing plate 5 is brought into contact with the surface 91 of a bottle 9a. A squeegee 3 is brought down and brought into contact with the printing plate 5 and the squeegee 3 is moved transversely under the state, and the upward surface 91 of the bottle 9a is printed. When the squeegee 3 approaches to the ridge section 93 of the bottle 9a, a driving device is operated by a detector, the bottle 9a is turned at 90 deg., and the next surface 92 is brought into contact with the screen printing plate 5. The squeegee 3 is shifted transversely without stoppage even during that time, and two surfaces 91, 92 containing the ridge section 93 are screen-printed continuously when the squeegee 3 passes through the bottle 9a.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a method of screen printing a rectangular cylindrical workpiece such as a rectangular bottle.

(Conventional example) Screen printing on truly cylindrical workpieces has been put to practical use.

In this printing method, a workpiece is fitted onto a rotating support shaft placed below a screen printing plate, and while the workpiece is brought into contact with the printing plate, the cylinder is rotated in accordance with the horizontal movement of the printing plate.

However, even when the above method is applied to a rectangular cylindrical workpiece, the distance from the axis to the surface of the workpiece is not constant, and when the cylinder rotates, the distance between the flat surface of the cylinder and the printing plate is A gap was created between the cylinders and a continuous pattern could not be printed on the outer circumference of the cylinder.

Therefore, the applicant previously proposed a method of printing a continuous pattern on two or more surfaces of the workpiece, including the ridgeline (Patent Application No. 58
-147705). This method involves supporting a rectangular cylindrical work horizontally below a screen printing plate so that it can rotate freely and applying it to the printing plate, pressing a squeegee downward to press the soft printing plate against the work, and then pressing the printing plate against the printing plate. While moving horizontally, the workpiece is rotated at the side position along the direction of movement of the printing plate,
The difference in distance between the surface of the workpiece and the ridgeline from the center of rotation of the workpiece was absorbed by the deflection of the screen printing plate.

(Problems to be Solved by the Invention) The above printing method for rectangular cylindrical workpieces has no problem with small diameter workpieces with an approximately square cross section, but when the cross section is rectangular and the vertical and horizontal lengths of the cross section are The larger the ratio, the more stress is applied to the screen printing plate when the workpiece is rotated, causing problems such as damage to the screen printing plate or misalignment of printing.

(Means for solving the problem) In order to solve the above problem, the method of the present invention applies one side (911) of the rectangular tubular workpiece (9) to the screen printing plate (5), and moves the squeegee (3) to reduce the liquid level. (9) Print on L. When the squeegee (3) approaches the ridgeline of the workpiece (9), rotate the workpiece (9) around the ridgeline of the workpiece (9) as the center of rotation, and then Place the surface (93) on the printing plate (5) and move the squeegee (3) further to remove the workpiece (
9) ridge line (2 adjacent sides including 931 + 911 @
Print continuously.

In addition, the device for carrying out the above method is capable of attaching and detaching the rectangular cylindrical workpiece (9) below the screen printing plate (5).
A support (7) for horizontally supporting the third function and the support (7)
) rotatably supported in the direction of movement of the squeegee (3) on the screen printing plate (5), and a support (7).
) and a drive device (8) that rotationally drives the support (7), and is characterized in that the rotation center A of the support (7) is located on an extension of the vicinity of the ridgeline of the rectangular cylindrical workpiece to be clamped to the support (7). shall be.

(Functions and Effects) Since the workpiece (9) rotates around the vicinity of the second ridge line (93) that sandwiches the two surfaces to be printed (9 Kyu-Sho), it rotates regardless of the ratio of the vertical and horizontal lengths of the cross-section of the workpiece. Above 2 pages (9 old □□
□ can be applied parallel to the screen printing plate (5) in order without applying force, and the 2 parts including the ridgeline part (93) of the workpiece
It is possible to print a continuous pattern on the surface.

(Example) Figures 1 and 2 show the main parts of a screen printing device, in which an elevator frame (2) is arranged on a slide block (1) that reciprocates laterally on a guide rod (till α1). .

A support tube (21) is provided protruding from the lifting frame (2), and a core portion (21
) is fitted with a shaft (31) having a squeegee (3) at its lower end so as to be slidable in the vertical direction, and is biased upward by a spring.

An air cylinder device (support) that drives the shaft Gll of the squeegee (3) up and down is provided on the support tube 21+.

A doctor (4) is provided near the squeegee (3) so as to be movable up and down.

A screen printing plate (5) is disposed below the squeegee (3) so as to be movable up and down, and ink (51) is placed on the printing plate (5).
will be posted.

A rotation support device (6) for a square tubular workpiece (9) is provided below the printing plate (5).

The workpiece (9) of the example is a square bottle (9a) having a mouth (90) at one end. The cross-sectional shape of the square bottle (9-ri) is approximately rectangular, but each ridgeline portion (93) has a rounded shape.

The rotation support device (6) includes a support (7) that removably holds the square bottle (9a) horizontally, a base (61) that rotatably supports the support (7), and a support (7). It is composed of a rotating drive device (8).

The support (7) is a parallel arm plate (711-) of a U-shaped frame (70).
One of the arm plates (71) has four parts 176) into which the bottom of the square bottle (9a) fits shallowly on the inner surface of the tip, and the other arm plate (721)
A clamp device (73) is provided for pressing and clamping the mouth (90) of the square bottle (9a).

The clamp device (731 is a conical holding member t74 that hits the mouth (9o) of the square bottle (9a)) is attached to the air cylinder device (
75).

The support (7) has a square bottle (9) attached to the upper end of one arm plate (71).
A reversing shaft is provided protruding parallel to the axis of a) and on the extension near the ridgeline part (931) of the square bottle, and the shaft is parallel to the screen printing plate (5) and connected to the squeegee (3). The base (61) is rotatably supported perpendicular to the lateral movement direction of the base (61).

Further, a drive device (8) for rotating the support (7) is provided on the base (61). The drive device (8) is mounted on a base (61
), the piston rod (821) being pivotally supported on the support (7).
It is pivotally connected to the arm plate σl).

By the operation of the air cylinder device (81), the support (7) and the square bottle (9a) are reversed 90 degrees around the reversal axis (m).

Also, a squeegee (3) is placed on the transition path of the slide block.
A detector (not shown) such as a limit switch is provided to activate the drive device (8) when the workpiece moves laterally and approaches the ridgeline (93) of the workpiece.

A screen printing method using the above printing device will be explained.

Fit the bottom of the square bottle (9a) into the recess ff6) of the support (7), and press the bottle (9a) with the holding member ff4) of the clamp device.
Press the opening (ffl) to fix the bottle (9a) to the support (7).

Next, the screen printing plate (5) is lowered as shown in FIG. 4A, and the printing plate (5) is brought into contact with the surface (91) of the bottle (9a).

The squeegee (3) is lowered and applied to the printing plate (5), and in this state, the squeegee (3) is moved laterally to print on the upward surface (911) of the bottle (9a).

When the squeegee (3) reaches the ridgeline (931) of the bottle (9a), the drive device (8) is actuated by the detector, and the support (7) and therefore the bottle (9a) are rotated 90 degrees around the reversal axis plane. , the next side (921) touches the screen printing plate (5) (Fig. 4B).

During this time, the squeegee (3) moves horizontally without stopping, and if the squeegee (3) passes the bottle (9a), the ridgeline (
Screen printing can be performed continuously on two sides including 93) +91+ and +92).

If the squeegee (3) passes the square bottle (9a), the squeegee (
3) and the printing plate (5) are raised and the doctor (4) is lowered.

In this state, move the squeegee (3) and doctor (4) back.

During this time, release the clamp on the square bottle (9a), replace the printed bottle with a new bottle, activate the drive device (8), and turn the support (7) 90 degrees in the opposite direction. and return it to its original position.

Repeat the above operations to print.

The present invention is not limited to workpieces having a rectangular cross section as described above, but can be implemented in two-sided printing of triangular or other polygonal workpieces, and various modifications are possible within the scope of the claims.

[Brief explanation of the drawing]

Figure 1 is a front view of the main parts of the screen printing machine, Figure 2 is a side view of the same as above, Figure 3 is a perspective view of the rotation support device, Figure 4A,
FIG. 4B and FIG. 4C are explanatory diagrams of the printing order. (3)...Squeegee (5)...-Screen printing plate (7)...Support (8)...Drive device (9)...Workpiece (93)...Ridge line part Fig. 4 A Figure 4B Figure 4C d

Claims (1)

[Claims] [1] One side of the square tubular workpiece (9) is placed on the screen printing plate (5), and the squeegee (3) is moved to place the side (91) on the screen printing plate (5).
When the squeegee (3) approaches the ridgeline (93) of the workpiece (9), the workpiece (9) is rotated around the ridgeline (93) as a center of rotation and the next surface of the workpiece is printed. (92) against the printing plate (5) and move the squeegee to remove the two adjacent surfaces (91) and (9) including the ridgeline (93).
2) Screen printing method for rectangular cylindrical workpieces in which printing is performed continuously. [2] The screen printing method for a rectangular cylindrical workpiece according to claim 1, wherein the squeegee (3) does not stop and continuously moves laterally until printing on two sides is completed. [3] The screen printing method for a rectangular cylindrical workpiece according to claim 1, wherein the prismatic cylindrical workpiece (9) is a square bottle having a substantially rectangular cross section and having a mouth (90). [4] The screen printing method for a rectangular cylindrical workpiece according to any one of claims 1 to 3, wherein the ridgeline portion (93) of the workpiece has a rounded shape. [5] A support (7) that is disposed below the screen printing plate (5) and detachably supports the rectangular cylindrical workpiece (9) horizontally.
), and a base (6) that rotatably supports the support (7) in the direction of movement of the squeegee (3) on the screen printing plate (5).
1) and a drive device (8) that rotationally drives the support (7), and the center of rotation of the support (7) is the center of rotation of the rectangular cylindrical workpiece (9) that is attached laterally to the support (7). A screen printing device for a rectangular cylindrical workpiece, characterized in that the screen printing device is located on an extension of the vicinity of an upper side ridgeline portion (93).