JPH0815782B2 - Printing error adjustment device in screen printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a printing error adjusting device in a screen printing machine.

(Prior Art) Generally, a screen printing machine has a plate frame 42 provided above a printing table 41 as shown in FIGS.
A screen 43 is stretched inside and a plate frame 42 is fixed to a plate mount 44 as shown in FIG. Then, at the start of printing, the plate frame 42 is arranged substantially horizontally with respect to the printing table 41, and the squeegee 46 slides while pressing the screen 43 while performing printing, and printing is performed on one sheet of paper. On the plate mount 44
The plate frame 42 is rotated around a plate separating shaft 45 provided in the so that the screen 43 is separated from the printing paper.

(Problems to be Solved by the Invention) However, in the above screen printing machine,
Since the squeegee 46 presses the screen 43, tension is applied to the screen 43 as shown by the arrows in FIGS. 7 (a) and 7 (b), and the screen 43 expands and contracts. The characters, patterns, etc. printed by may expand or contract as compared with the original printed on the screen 43. Therefore, there is a problem that it is difficult to print the document accurately.

This invention has been made in view of the above problems,
An object of the present invention is to provide a printing error adjusting device for a screen printing machine, which can prevent printing elongation and printing contraction during printing to enable accurate printing, and can perform adjustment work for that very easily. It is in.

Configuration of the Invention (Means for Solving Problems) In order to achieve the above object, in the present invention, a screen is stretched in a screen plate provided above a machine base,
In a screen printing machine that performs printing by pressing and sliding a squeegee on the screen, a printing error adjusting device provided with an adjusting mechanism for moving and adjusting the screen plate with the movement of the squeegee. One end of the member is slidably supported in synchronization with the movement of the squeegee,
The other end is rotatably supported by a first shaft provided on the machine base and is slidably supported in the rotating member, and the guide member is provided in accordance with the rotating angle of the rotating member. Of the screen plate moving member is rotatably supported by a second shaft provided on the machine base, and a guide member is provided on one side of the screen plate moving member sandwiching the second shaft. The structure is such that the screen plate moving member is rotated by an angle according to the sliding angle of the guide member by slidably supporting the screen plate, and the screen plate moving member is provided on the other side of the screen plate moving member with the second shaft interposed therebetween. A structure in which the screen plate is moved in either the moving direction of the squeegee or the opposite direction according to the turning angle of the screen plate moving member by connecting by the amount corresponding to the turning angle of the screen plate moving member, Furthermore, the rotating member The printing error adjustment unit as its gist in round the rotation angle connecting the operating member for externally adjustable screen printing machine.

(Operation) By adopting the above-mentioned means in this invention, the guide member is supported by the rotating member and slides in synchronization with the movement of the squeegee. The turning angle of the turning member is adjusted based on an external operation of the operating member, and the sliding direction of the guide member is variable according to the turning angle of the turning member. Accordingly, the screen plate moving member is rotated. Then, the screen plate is moved either in the moving direction of the squeegee or in the opposite direction by an amount corresponding to the rotation angle of the screen plate moving member.

Therefore, when the squeegee pressurizes the screen and extends it, the screen plate is moved in the opposite direction to the squeegee through the rotating member, the guide member, and the screen plate moving member by the external operation of the operating member. It moves by an appropriate amount to correct the print elongation that has occurred on the screen.

When the squeegee contracts the screen, the screen plate moves in the same direction as the squeegee by the external operation of the operating member, in the same direction as the squeegee, through the rotating member, the guide member, and the screen plate moving member. , The printing shrinkage that occurs on the screen is corrected.

(Embodiment) An embodiment of the present invention will be described below with reference to FIGS. 1 to 6.

As shown in FIGS. 1 and 3, a table 2 for placing printing paper P is arranged on the upper surface of a machine base 1 of the screen printing machine, and a screen 4 is arranged above the machine base 1. A stretched screen plate 5 is supported.

As shown in FIGS. 4 and 5, the screen plate 5 is attached to the plate mounting base 6 at the rear end (left side) thereof, and the mounting base 6 is further provided with a pair of loose insertion holes 7 vertically. It is set up. Further, a holding plate 8 is placed on the mounting base 6, and a screw 9 loosely inserted into each loose insertion hole 7 through the holding plate 8 is mounted on the mounting base 6.
Is screwed into a support 10 arranged so as to come into contact with the lower surface of the. Therefore, the mounting base 6 is not fixed to the support base 10, but is slightly movable in the horizontal direction. Further, between both free insertion holes 7 of the mounting base 6, an engaging hole 7a extending so as to be orthogonal to these is provided, and a connecting rod 38 of the expansion and contraction adjusting mechanism 20 described later is engaged. Further, a plate separation shaft 11 is provided at the front end of the mounting base 6, and the screen plate 5 rotates integrally with the mounting base 6 and the support base 10 about the plate separation shaft 11 to move the screen plate 5 The separation operation is performed.

A pair of drive rollers 12 are arranged on the machine base 1 in the front-rear direction, and a drive belt 13 is hung between the drive rollers 12. The rear drive roller 12 is rotatably driven by a forward-reverse rotatable motor 14 provided above the rear drive roller 12 to rotate the drive belt 13. And drive belt 13
The squeegee 16 and the doctor 17 attached to the drive belt 13 via the support member 15 are moved by the orbital movement.

As shown in FIG. 3, the rotation shaft of the rear drive roller 12
A drive gear 19 having a diameter smaller than that of the drive roller 12 is attached to the drive roller 18. The drive gear 19 constitutes a part of the expansion / contraction adjusting mechanism 20 provided at the rear end of the machine base 1, and synchronizes the expansion / contraction adjusting mechanism 20 with the squeegee 16 and the doctor 17 moved by the drive belt 13. I am supposed to exercise.

Explaining the expansion and contraction adjusting mechanism 20 below, a rotary gear 21 having a larger diameter than the drive gear 19 is meshed with the drive gear 19, and an eccentric cam 23 is provided on a rotary shaft 22 of the rotary gear 21. It is attached so that it can rotate integrally.

A guide rod 24 as a guide member extending in the horizontal direction is disposed behind the eccentric cam 23. A bifurcated portion 25 is formed at the front end of the guide rod 24, and the bifurcated portion 25 causes the rotating shaft 22 to project to one side of the eccentric cam 23.
Are slidably clamped.

A tension spring 26 is attached to the bifurcated portion 25,
The guide rod 24 is biased toward the tip end by 26. In addition, a cam follower 27 is provided on one rear side of the bifurcated portion 25.
Is provided.

The eccentric cam 23 is held at the position shown in FIGS. 1 and 6 (a) at the beginning of printing, and is rotated counterclockwise with the movement of the squeegee 16 to pull the guide rod 24 against the urging force of the spring 26. It gradually moves backwards against. A sliding roller 29 is provided on the side surface of the rear end portion of the guide rod 24 so as to project.

An adjusting nut 30 with a scale as an operating member is screwed into the rear end of the machine base 1, and the lower end of the adjusting nut 30 is connected to the rear end of a rotating cam 31 as a rotating member in the machine base 1. There is. A central portion of the rotating cam 31 is rotatably supported by a holding shaft 32 as a first shaft provided on the machine base 1. A sliding roller 29 of the guide rod 24 is movably fitted along the cam groove 33 in a cam groove 33 that is recessed in the lengthwise direction of the rotating cam 31.

1 and 6 (a) are printed and extended on the screen 4,
It shows a state in which the adjustment nut 30 is screwed into the machine base 1 when imprinting does not occur and adjustment is unnecessary. Then, as shown in FIG. 6B, the amount of screwing of the adjusting nut 30 is increased when the screen 4 is stretched by printing. Further, as shown in FIG. 6 (c), when the screen 4 is contracted by printing, the screwing amount of the adjusting nut 30 is reduced.

Secondly, a crank member 34 as a screen moving member is provided on the machine base 1 at a position adjacent to the guide rod 24.
It is rotatably supported by a shaft 35 as a shaft, and a pair of support rollers 36 is attached to one end of the shaft. The pair of support rollers 36 holds the central portion of the guide rod 24 in the longitudinal direction so as to be slidable from both upper and lower sides. At the other end of the crank member 34 is a moving rod extending in the tip direction.
37 is rotatably mounted, and the tip end of a connecting rod 38 projecting in the orthogonal direction from the moving rod 37 is fitted in the fitting hole 7a of the mounting base 6.

Now, a method of adjusting the print elongation and the print contraction of the screen 4 by the print error adjusting device configured as described above will be described below.

When the motor 14 is operated at the start of printing, the rear drive roller 12 rotates clockwise to move the drive belt 13 by a predetermined amount. With the movement of the drive belt 13, the support member 15
Moves and the squeegee 16 slides under pressure on the screen 4,
Imprinting is generated on the screen 4 in the moving direction of the squeegee 16.

When the rear drive roller 12 rotates, the drive gear 19 also rotates, and the rotating gear 21 meshing with this rotates in the counterclockwise direction. Then, the eccentric cam 23 rotates counterclockwise and gradually presses the cam follower 27 of the guide rod 24 rearward.
Then, at the end of printing, the protruding portion 28 of the eccentric cam 23 engages with the cam follower 27 of the guide rod 24 and presses it backward, moving the entire guide rod 24 to the rearmost position.

As described above, the amount of screwing the adjusting nut 30 into the machine base 1 is large at the time of adjusting the print elongation, and the rear end of the rotating cam 31 is low and the front end thereof is high. Therefore, as shown in FIG. 6 (b), the sliding rollers of the guide rod 24 are
29 moves obliquely downward in the cam groove 33 of the rotating cam 31,
The guide rod 24 is moved to a position where it becomes higher toward the tip. Therefore, the central portion of the guide rod 24 is slightly lowered to lower one end of the crank member 34. Then, the crank member 34
The other end of the shaft rotates in the counterclockwise direction about the shaft 35, moves the moving rod 37 in the distal direction, and slightly moves the mount 6 in the distal direction via the connecting rod. Therefore, the moving rod 37
6 protrudes toward the tip end by α as compared with the horizontal state shown in FIG. 6A, moves the screen plate 5 in the direction opposite to the sliding direction of the squeegee 16, and corrects the print elongation generated on the screen 4.

Therefore, the printing paper P is accurately printed, and the next printing paper P is printed, so that the above operation is repeated.

The screwing amount of the adjusting nut 30 into the machine base 1 is set in accordance with the printing elongation amount of the screen 4.
Then, the adjusting nut 30 is accurately screwed in according to the set value in accordance with the scale, so that the work for straightening the printing elongation becomes extremely accurate.

When the screen 4 is shrunk, the adjustment nut 30 is screwed into the machine base 1 as shown in FIG. 6C, and the tip of the rotating cam 31 is lowered. Then, when the guide rod 24 moves rearward by the action of the eccentric cam 23, the guide rod 24 rises toward the rear end and slightly raises one end of the crank member 34.

Therefore, the other end of the crank member 34 rotates clockwise about the shaft 35, moves the moving rod 37 in the rear end direction, and slightly moves the mount 6 in the rear end direction via the connecting rod 38. . Therefore, the moving rod 37 is retracted by β as compared with the horizontal state shown in FIG. 6 (a), and the mount 6 and the screen plate 5 are moved slightly backward via the moving rod 37 and the connecting rod 38. . Therefore, the screen version 5 has a squeegee 16
Is moved in the same direction as the moving direction, and the printing shrinkage generated on the screen 4 is corrected.

As described above, in this screen printing machine, the printing elongation and the printing contraction are surely corrected, and the printing can be adjusted so that accurate printing can be performed.

EFFECTS OF THE INVENTION As described in detail above, according to the present invention, the printing error can be surely adjusted corresponding to the expansion and contraction of the screen to enable accurate printing, and the printing elongation or the printing shrinkage adjustment work can be easily performed. You can

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view showing the expansion and contraction adjusting mechanism of a screen printing machine according to the present invention in concrete form, FIG. 2 is its plan view, and FIG. 3 is a schematic front view showing the screen printing machine. FIG. 4 is a sectional view showing the plate mount, FIG. 5 is a plan view thereof, FIG. 6 (a) is a schematic front view showing an adjusting mechanism when the screen has no expansion / contraction error, and FIG. 6 (b) is FIG. 6 (c) is a schematic front view showing the operating state of the expansion and contraction adjusting mechanism at the time of printing extension.
Is a schematic front view showing the operating state of the expansion and contraction adjusting mechanism at the time of printing contraction, FIGS. 7 (a) and 7 (b) are schematic explanatory views showing a conventional technique, and FIG. 8 is a sectional view showing the conventional technique. . Machine stand 1, screen 4, screen version 5, squeegee 16,
An adjusting mechanism 20, a guide rod 24 as a guide member, an adjusting nut 30 as an operating member, a rotating cam 31 as a rotating member,
A holding shaft 32 as a first shaft, a crank member 34 as a screen plate moving member, and a shaft 35 as a second shaft.

Claims (1)

[Claims] 1. A screen (4) is stretched in a screen plate (5) provided above a machine base (1), and a squeegee (16) is slid on the screen (4) under pressure. A screen printing machine that performs printing by means of a printing error adjusting device provided with an adjusting mechanism (20) for moving and adjusting the screen plate (5) with the movement of the squeegee (16), the guide member (24). Has one end slidably supported in synchronization with the movement of the squeegee (16), and the other end rotatably supported by a first shaft (32) provided on the machine base (1) and rotated. The sliding member is slidably supported in the moving member (31), and the sliding angle of the guide member (24) is variable according to the turning angle of the turning member (31). 3
4) is rotatably supported by a second shaft (35) provided on the machine base (1), and a guide member is provided on one side of the screen plate moving member (34) sandwiching the second shaft (35). The screen plate moving member (34) is structured so that the screen plate moving member (34) is rotated by an angle corresponding to the sliding angle of the guide member (24) by slidably supporting the screen plate moving member (34). Second
By connecting the screen plate (5) to the other side with the shaft (35) sandwiched between the screen plate (5), the screen plate (5) moves in the direction of movement of the squeegee (16) or vice versa according to the rotation angle of the screen plate moving member (34). Screen plate moving member in either direction (34)
A screen having a structure in which it is moved by an amount corresponding to the rotation angle of the, and an operation member (30) for externally adjusting the rotation angle is connected to the rotation member (31). Printing error adjustment device in a printing machine.