JPH0224215B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a screen printing machine suitable for automatically performing screen printing on the outer peripheral surface of a cylindrical container such as a glass bottle or a cup.

The conventionally widely used screen printing machines for cylindrical containers such as those mentioned above are:
A large number of printing material holders are attached to a horizontally moving conveyor chain, and these are moved intermittently or continuously to pass below the screen.
At this time, printing is performed by pushing the printing material up toward the screen and rolling it while making contact with the screen. This type of printing machine is suitable for multicolor printing because it can install many screens, but it has drawbacks such as the large number of printing material holders, which makes it troublesome to change types and maintenance, and requires a large space. , it was not always satisfactory.

The present invention has been made in order to solve the above-mentioned drawbacks of the prior art.The present invention has been made in order to solve the above-mentioned drawbacks of the prior art. A driven wheel for intermittent rotation of a rotary plate with six sets of printing material holders around the periphery is engaged with the cam, and the lower end of a screen support frame pivotally supported on both sides of the upper part of the machine frame is engaged with the screen cam. The squeegee cam is equipped with an L-shaped squeegee arm that is pivoted to the top of the machine frame and whose front end extends over the screen support frame to the top of the screen. This device is characterized in that the squeegee is moved up and down synchronously with the rotary disk by engaging the curved lower end. The present invention will be explained in more detail below with reference to illustrated embodiments.

FIG. 1 is a front view of the screen printing machine of the present invention;
Figure 2 is a left side view, Figure 3 is a perspective view of the main parts,
FIG. 4 is an explanatory diagram of the driving portion.

As shown in these drawings, a rotary disk 2 is provided on the front of the machine frame 1, and a motor 3 is provided on the right side of the machine frame 1. The motor 3 rotates a horizontal drive shaft 5 provided inside the machine frame 1 at a constant speed via a worm gear 4. Horizontal drive shaft 5
An index cam 6 is fixed to the center part of the index cam 6, a pair of squeegee cams 7 are fixed to both sides of the index cam 6, and a pair of screen cams 8 are fixed to the outermost part of the index cam 6.

The index cam 6 is a drum-shaped cam, and on its lower surface there is a driven wheel 10 having six rollers 9 on its circumference.
is engaged. The driven wheel 10 is fixed to the rotation shaft 11 of the rotary disk 2, and when the horizontal drive shaft 5 rotates at a constant speed, the rotary disk 2 is intermittently rotated by 60 degrees in a vertical plane for each rotation. 6 around the turntable 2
A set of printing material holders 12 is attached. Each printing material holder 12 checks the printing material 13 at position A shown in FIG. The screen printing for the second color is performed at the position E, and then the printing material is released at the position F. Note that 14 is the printing material 1
The conveyor 15 for supplying 3 is a take-out conveyor, 1
Reference numeral 6 denotes a supply device, and 17 a take-out device.Since the structure of these parts is as shown in Japanese Patent Publication No. 35450/1983, detailed explanation will be omitted.

The screen cam 8 is attached to both end portions of the horizontal drive shaft 5 that protrude to the left and right of the machine frame 1, and rotates along the left and right side surfaces of the machine frame 1. A pair of left and right screen support frames 18 are installed on both sides of the upper part of the machine frame 1.
is pivotally supported by a horizontal shaft 19. A cam roller 20 is attached to the lower end portion of this screen support frame 18 and engages with the side surface of the screen cam 8. When the horizontal drive shaft 5 rotates, the screen cam 8 causes the screen support frame 18 to swing upward about the horizontal shaft 19.

At the tip of the screen support frame 18 there are two
Book guide rails 21 and 22 are provided horizontally, and a slider 23 is mounted on these guide rails.
is supported. Two sets of screens 24 are attached to the front surface of the slider 23, corresponding to positions C and D. As shown in FIG. 4, a screw gear 25 is attached to a portion to the right of the center of the horizontal drive shaft 5, and a screw gear 26 meshing with the screw gear 25 rotates a rotary plate 27 at a constant speed. A member 28 having a U-shaped cross section is rotatably attached to the rotary plate 27 at an eccentric position. Therefore, as the rotating plate 27 rotates, the slider 23 reciprocates left and right on the guide rails 21 and 22. The above-described horizontal movement and the vertical movement caused by the swinging of the screen support frame 18 are combined, and the screen 24 moves as shown in FIG.
exercise synchronously.

The squeegee cams 7 are attached to both sides of the index cam 6 of the horizontal drive shaft 5. An L-shaped squeegee arm 32 having a cam roller 31 at its lower end that engages with the squeegee cam 7 is pivotally supported on the horizontal shaft 19 at the top of the machine frame 1 . Squeegee arm 32
The front end extends over the screen support frame 18 and the slider 23 supported thereto to above the screen 24, and a squeegee 33 corresponding to each screen 24 is provided at the front end. Therefore, when the squeegee cam 7 rotates due to the rotation of the horizontal drive shaft 5, the squeegee arm 32 moves up and down synchronously with the rotary disk 2.

Next, the operation of this device will be explained.

When the horizontal drive shaft 5 is rotated at a constant speed by the motor 3, the index cam 6 intermittently rotates the driven wheel 10 that is engaged with it, so that the rotary disk 2 is rotated in a vertical plane.
Rotate counterclockwise in 60° increments. Each of the printing material holders 12 provided around the rotary disk 2 is equipped with a gear 34, and when these gears 34 mesh with a sun gear 35, each printing material holder 1
2 rotates, for example, by 360 degrees while the rotary disk 2 is stopped.

Focusing on a particular printing material holder 12, the printing material 13 is received by the feeding device 16 from the conveyor 14 at the A position, and after alignment is performed if necessary at the B position, the printing material holder 12 is moved to the C position. When the printing material holder 12 stops at position C and is about to start rotating, the short diameter part of the screen cam 8 is in contact with the cam roller 20, and the screen support frame 18 is rotated downward by its own weight around the horizontal axis 19. I'm going down. Also, at this time, since the slider 23 supported at the tip of the screen support frame 18 is at the right end, the screen 24 is at the X point on the trajectory in FIG. Almost at the same time as the printing material holder 12 starts rotating, the screen 24 comes into contact with the upper surface of the printing material 13. At this time, the squeegee cam 7 lowers the squeegee arm 32, and the squeegee 33 moves the screen 24 to the screen 24 at point Y in FIG.
is pressed onto the upper surface of the printing medium 13. The printing material 13 continues to rotate in this state, and the screen 24 moves horizontally to the left while being guided by the guide rails 21 and 22, so that the first color is applied to the entire surface of the printing material 13 over the entire circumference. will be screen printed.

When the screen 24 reaches point Z in FIG. 5, the screen cam 8 swings the screen support frame 18 upward, and the squeegee cam 7 swings the squeegee arm 32 upward, so that the screen 24 and squeegee 33 They are lifted upward almost simultaneously from the Z point to complete screen printing of the first color. Thereafter, the index cam 6 rotates the rotary disk 2 by 60 degrees and transfers the printing medium 13 from the C position to the D position. At this time, the printing medium 13 moves along an arcuate path centered around the rotating shaft 11 of the rotary disk 2, but the screen 24 moves as described above.
Since the squeegee 33 is moving upward, the printing medium 13 can be moved to the D position without colliding with them. Note that while the screen support frame 18 is being lifted by the screen cam 8, the slider 23 returns to the right as shown in FIG. 5 and prepares for the next printing.

At the D position, as in the C position, the second color screen printing is performed on the surface of the printing medium 13, and after passing through the E position, the printing medium 13 is transferred to the printing medium holder 12 by the take-out device 17 at the F position.
It is taken out onto the take-out conveyor 15.

As explained above, the printing press of the present invention has an index cam, a screen cam, and a squeegee cam attached to the horizontal drive shaft provided inside the machine frame.
The index cam was engaged with a driven wheel for intermittent rotation of a rotary plate with six sets of printing material holders around the periphery, so that as the horizontal drive shaft rotated, the printing material holders were rotated by 60 degrees in the vertical plane. It rotates, and screen printing is performed during one rotation. In addition, the lower end of the screen support frame, which is pivotally supported on both sides of the upper part of the machine frame, is engaged with the screen cam to move the screen up and down synchronously with the rotary disk, so when the rotary disk rotates, the printing material Even if the object moves along an arcuate path, collision between the screen and the printing material can be prevented by raising the screen at an appropriate timing. Furthermore, according to the cam system of the present invention, the vertical movement of the screen can be freely controlled by simply replacing the screen cam.
The timing of lowering and raising the screen can be easily changed depending on whether printing is done on a small portion or on the entire circumference. This is effective in achieving beautiful screen printing.

Furthermore, in the printing press of the present invention, the L-shaped lower end of the squeegee arm is engaged with the squeegee cam, and the squeegee at the front end of the squeegee arm is moved up and down in synchronization with the rotary disk, so that the screen can be easily moved. The timing of the squeegee can be adjusted very easily, such as pressing the screen against the surface of the printing material with the squeegee immediately after contacting the printing material, and raising the screen and the squeegee almost simultaneously upon completion of screen printing.

As described above, the printing press of the present invention is configured such that the index cam, screen cam, and squeegee cam are attached to a common horizontal drive shaft, and these cams control the intermittent rotation of the rotary plate and the vertical movement of the screen and squeegee. Because of this, it is easy to adjust the timing, the structure is simple, and the operation is reliable. Furthermore, since the printing machine of the present invention has a small number of printing material holders, it does not take much effort to change types or maintain it, requires less installation space, and has other advantages such as high printing speed, so it will contribute to the industry. The place is large.

[Brief explanation of drawings]

FIG. 1 is a front view of the screen printing machine of the present invention;
Figure 2 is a left side view, Figure 3 is a perspective view of the main parts,
FIG. 4 is an explanatory diagram of the driving portion, and FIG. 5 is a diagram showing the locus of movement of the screen. 1: Machine frame, 2: Turntable, 5: Horizontal drive shaft, 6:
Index cam, 7: Squeegee cam, 8: Screen cam, 10: Driven wheel, 12: Printing material holder, 18: Screen support frame, 24: Screen, 32: Squeegee arm, 33: Squeegee.

Claims (1)

[Claims] 1. An index cam 6, a screen cam 8, and a squeegee cam 7 are attached to a horizontal drive shaft 5 provided inside the machine frame 1. The driven wheel 10 for intermittent rotation of the board 2 is engaged, and the screen cam 8 is engaged with the lower end of the screen support frame 18 pivotally supported on both sides of the upper part of the machine frame 1 to synchronize the screen 24 with the rotating board 2. Furthermore, the squeegee cam 7 has an L-shaped lower end of a squeegee arm 32 which is pivotally supported on the upper part of the machine frame 1 and whose front end extends over the screen support frame 18 and above the screen 24. A screen printing machine characterized in that the squeegee 33 is moved up and down synchronously with the rotary disk 2 by engaging the parts.