JP2782582B2 - Printed object detection device for screen printing machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing medium detecting apparatus for a screen printing machine, and more particularly to a printing medium detecting apparatus for a screen printing machine for printing on a printing medium having a curved outer peripheral cross section. It is about.

[0002]

2. Description of the Related Art In conventional screen printing, it is difficult to detect the outer peripheral shape of a printing medium whose cross section has various curved shapes. Was very difficult.

[0005] An outline will be given based on FIGS. 5 to 8. FIG.
FIG. 6 is a perspective view of a printing medium P having a curved cross section. When screen printing is performed on a printing area A on the curved outer peripheral surface of the printing medium P, the printing medium detection as shown in FIG. Devices are conceivable. FIG. 6 is a schematic explanatory view of the printing medium detecting device 2 for the screen printing machine 1. The screen printing machine 1 includes the printing medium detecting device 2 and a printing control mechanism 3.
A printing medium driving mechanism 4, a screen driving mechanism 5,
Having.

The printing medium detection device 2 includes a displacement sensor 6 for detecting the shape of the outer peripheral surface of the printing medium P, and a detection control mechanism 7.
And

[0005] The print control mechanism 3 receives a detection signal from the detection control mechanism 7 and controls the operation of the entire screen printing machine 1.

The printing medium driving mechanism 4 rotates the printing medium P in synchronization with the screen driving mechanism 5 or rotates a predetermined plane (X
(Y plane).

The screen driving mechanism 5 drives the screen 8 made of silk, nylon, tetron, stainless steel or the like, and is synchronized with the rotation of the printing medium P by the printing medium driving mechanism 4 with respect to the fixed squeegee 9. To move the screen 8.

The displacement sensor 6 has a sensor needle 10 constituted by a linear transformer or the like and capable of detecting a linear movement distance. That is, while the print medium P is being rotated by the detection drive mechanism 11, the distance R from the detection rotation center C is detected by the displacement of the sensor needle 10, and the rotation angle of the print medium P from the zero rotation position T is detected. θ is detected by the detection drive mechanism 11.

On the basis of these detection signals, the printing medium P
Is determined, and based on the determination result, the printing medium P and the screen 8 are synchronously driven via the printing medium drive mechanism 4 and the screen drive mechanism 5 to perform screen printing.

However, as shown in FIG.
When the contact angle K between the sensor needle 10 of the displacement sensor 6 and the outer peripheral surface of the printing medium P becomes small, the sensor needle 10 cannot substantially operate (displace), and the distance R from the detection rotation center C is reduced. There is a problem that cannot be detected.

Further, as shown in FIG.
When the contact angle K is small, the contact point Q between the sensor needle 10 and the outer peripheral surface of the printing medium P is displaced from the substantial center line 10C of the sensor needle 10, so that the arithmetic processing for correcting this displacement is troublesome. There is a problem that is.

In addition, without detecting the outer peripheral shape of the printing medium P, a screen cam (not shown) is employed. However, as in the case of the above-described configuration, it is not practical because the contact operation between the trailing cam and the outer peripheral surface of the printing medium P cannot be performed smoothly. .

[0013] In short, with the conventional detecting device, the outer peripheral shape of the printing medium P cannot be accurately and easily detected, so that the screen printing cannot be performed particularly on the printing medium P having a curved shape. There is a problem.

[0014]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is an object of the present invention to detect a peripheral shape of a printing medium by a simple method and output a detection signal to a screen printing machine. An object of the present invention is to provide a printing medium detection device for a screen printing machine that can be used.

Another object of the present invention is to provide a printing medium detection apparatus for a screen printing machine capable of detecting a rotation angle of a printing medium from a zero rotation position and an interval from a rotation center for detection. I do.

Another object of the present invention is to provide a printing medium detection apparatus for a screen printing machine which can synchronize the driving of the screen printing machine with the driving of the printing medium by a detection signal.

[0017]

That is, the present invention focuses on the interposition of a flat contact bar between a displacement sensor and a printing medium, and uses a screen and a printing medium together with the screen. And a squeegee for performing screen printing on the printing medium, the printing medium detecting apparatus for a screen printing machine having a squeegee for detecting the outer shape of the printing medium, wherein the printing medium is rotated by a predetermined rotation. A detection drive mechanism that rotates around the center, a flat contact bar that can be brought into contact with the outer peripheral surface of the print medium that is rotated by the detection drive mechanism, and the print medium that is attached to the contact bar. A displacement sensor for detecting an interval from the rotation center for detection with the rotation of the sensor, and a detection signal from the displacement sensor and the detection drive mechanism. A detection control mechanism that determines the peripheral shape of the printing material, a printing material detection device for a screen printing machine, characterized in that it comprises a.

The detection drive mechanism can detect a rotation angle of the printing medium from a zero rotation position.

The contact bar may be disposed at right angles to the displacement sensor.

The displacement sensor may be capable of detecting an interval from the rotation center for detection of the printing medium to a contact point with the contact bar.

The detection control mechanism can output the external shape signal detected by the printing medium to the screen printing machine.

The drive mechanism for detection keeps the printing medium in a fixed state except for the direction in which the printing medium is rotated, and the displacement sensor makes the movable state in the direction of the distance from the rotation center for detection. be able to.

The detection driving mechanism makes the movable state in the direction of the interval from the detection rotation center,
The displacement sensor can be fixed to the contact bar.

The screen printing machine has a screen driving mechanism for driving the screen and a printing medium driving mechanism for driving the printing medium, and based on a detection signal from the detection control mechanism, these screen driving mechanisms. Screen printing can be performed by synchronizing the screen driving mechanism and the printing medium driving mechanism.

[0024]

In the printing medium detecting apparatus for a screen printing machine according to the present invention, a flat contact bar is interposed between the displacement sensor and the printing medium. The contact point in contact with the surface moves in the left-right direction (length direction) of the contact bar with the rotation of the printing medium, and even when the contact angle between the contact bar and the outer peripheral surface of the printing medium increases. (As shown in FIG. 7, the contact angle between the sensor needle of the displacement sensor and the outer peripheral surface of the printing medium becomes small, especially at a sharply curved surface, etc.). Since the displacement sensor can be maintained parallel to the length direction (displacement direction) of the displacement sensor, displacement of the displacement sensor due to rotation of the printing medium can be reliably realized, and the outer peripheral shape of the printing medium can be accurately determined. Detect Door can be.

Furthermore, since the rotation angle of the printing medium from the zero rotation position and the distance from the rotation center for detection can be detected, the detection signal based on these polar coordinates is supplied to the screen printing machine. However, printing on a printing medium having a curved cross section can be realized.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a printing medium detecting apparatus for a screen printing machine according to an embodiment of the present invention will be described with reference to FIGS. However, the same parts as those in FIG. 5 to FIG.

FIG. 1 is a schematic explanatory view of a printing medium detecting device 20 for the screen printing machine 1, and FIG. 2 is an enlarged view of a main part of the same. 21
(Θ-Y axis control mechanism), a flat contact bar 22, the displacement sensor 6, and a detection control mechanism 23.

The detection drive mechanism 21 corresponds to the detection drive mechanism 11 and includes a θ-axis servomotor 24 and a Y-axis servomotor 25.

The θ-axis servo motor 24 outputs a detection signal based on a pulse train of the rotation angle θ of the printing medium P when rotated at a constant angular velocity from the zero rotation position T around the detection rotation center C.

The Y-axis servo motor 25 is provided with an interval L from the detection rotation center C to the outer peripheral surface of the printing medium P in contact with the contact bar 22 (from the detection rotation center C to the contact bar 22).
(The length of the vertical line set in the above) is output.

The plate-like contact bar 22 is provided with the displacement sensor 6.
The sensor needle 10 is disposed with a predetermined length (a length capable of contacting the outer peripheral surface with the rotation of the printing medium P) in a direction perpendicular to the direction of displacement of the sensor needle 10. It may be fixedly attached to the portion, or may be provided in a floating manner by an arbitrary servo support mechanism 26 so as to always contact the sensor needle 10 and the outer peripheral surface of the printing medium P.

In this embodiment, the detection drive mechanism 21 is controlled so that the sensor needle 10 of the displacement sensor 6 is located at the center of the stroke, that is, the stroke of the sensor needle 10 is constant. The rotation center C for detection is rotated one or more times while the stroke of No. 6 is zero (constant), and the value in the Y-axis direction at each rotation angle θ is output to the detection control mechanism 23.

The detection control mechanism 23 calculates the outer shape of the printing medium P from these detection signals (pulse trains) and outputs the outer shape signal to the print control mechanism 3 of the screen printing machine 1.

As shown in FIG. 2 on an enlarged scale, the sensor needle 10 is provided on the outer peripheral surface of the printing medium P via a flat contact bar 22.
, The contact S with the contact bar 22 is moved in the length direction of the contact bar 22 with the rotation of the printing medium P, and the sensor needle 10 is maintained at a right angle to the contact bar 22. In this state, the displacement of the sensor needle 10 (if the stroke of the displacement sensor 6 is controlled and detected so as to be constant, the displacement of the Y-axis servomotor 25)
Can be reliably detected even if it comes into contact with any outer peripheral surface portion of the printing medium P.

The detection control mechanism 23 determines the outer peripheral shape of the printing medium P based on these pulse trains, outputs a detection signal to the printing control mechanism 3 of the screen printing machine 1, and outputs the detection signal to the printing medium driving mechanism 4 and the screen. By synchronously driving the screen 8 together with the printing medium P via the driving mechanism 5, screen printing with predetermined contents can be performed.

Further, since the outer peripheral shape of the printing medium P can be accurately grasped, not only full-volume printing but also partial or divided printing, overlapping printing, and single printing information are performed on each surface. Arbitrary printing such as multi-sided printing can be performed.

In this embodiment, the detection signal is output to the Y-axis servomotor 25 with the stroke of the displacement sensor 6 being fixed (zero). However, the Y-axis servomotor 25 is fixed. The state may be set, and the displacement of the sensor needle 10 of the displacement sensor 6 may be directly detected.

According to the present invention, it is also possible to detect the outer peripheral shape of an arbitrary rotating body whose detection rotation center C moves with the rotation. For example, a printing medium P1 having a general shape as shown in FIG. There may be.

However, the printing medium P2 having the outer peripheral concave portion 30 on the outer peripheral surface as shown in FIG. 4 is not detected.

[0040]

As described above, according to the present invention, the displacement sensor and the printing medium are contacted via the flat contact bar for detection, so that the printing medium is detected from the zero rotation position. The rotation angle, the distance from the detection rotation center, and the like can always be detected, and screen printing of a printing body having a curved cross section, which was conventionally impossible, can be performed.

[0041]

[Brief description of the drawings]

FIG. 1 shows a screen printing machine 1 according to one embodiment of the present invention.
FIG. 1 is a schematic explanatory view of a printing medium detection device 20 for use.

FIG. 2 is an enlarged view of a main part of the same.

FIG. 3 is a cross-sectional view of a printing medium P1 having a general shape to be detected by the present invention.

FIG. 4 is a cross-sectional view of a printing medium P2 having an outer peripheral concave portion 30 on the outer peripheral surface, which is not to be detected by the present invention.

FIG. 5 is a perspective view of a printing medium P having a curved cross section.

FIG. 6 is a schematic explanatory view of a printing medium detection device 2 for a conventional screen printing machine 1.

FIG. 7 is an enlarged explanatory view of the displacement sensor 6 part.

FIG. 8 is a further enlarged explanatory view of the sensor needle 10 of the displacement sensor 6;

[Explanation of symbols]

REFERENCE SIGNS LIST 1 screen printing machine 2 printing medium detection device for screen printing machine 1 3 printing control mechanism 4 printing medium driving mechanism 5 screen driving mechanism 6 displacement sensor 7 detection control mechanism 8 screen 9 squeegee 10 sensor needle of displacement sensor 6 10C sensor Substantially the center line of the needle 10 11 Detection drive mechanism 20 Printed object detection device for the screen printing machine 1 21 Detection drive mechanism (θ-Y axis control mechanism) 22 Flat contact bar 23 Detection control mechanism 24 For θ axis Servo motor 25 Servo motor for Y-axis 26 Servo support mechanism for contact bar 22 Outer peripheral concave portion P, P1, P2 Printed object A Print area of curved outer peripheral surface of printed object P T Zero rotation position θ From zero rotation position T Rotation angle C of rotation center for detection R Distance from rotation center C for detection L Distance from rotation center C for detection (rotation for detection K The contact angle between the sensor needle 10 and the outer peripheral surface of the printing medium P. Q The contact point between the sensor needle 10 and the outer peripheral surface of the printing medium P. S The printing medium. Contact point between P and contact bar 22

Continuation of the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B41F 15/08 B41F 15/12 B41F 17/00 G01B 5/20

Claims (8)

(57) [Claims] A screen printing press for detecting an outer shape of the printing press of a screen printing press, comprising: a screen; and a squeegee for performing screen printing on the printing press using the screen. A detection device, comprising: a detection drive mechanism for rotating the print medium around a predetermined detection rotation center; and a flat plate that can contact an outer peripheral surface of the print medium rotated by the detection drive mechanism. And a displacement sensor attached to the contact bar to detect an interval from the rotation center for detection with rotation of the printing medium, and detection from the displacement sensor and the detection drive mechanism. A detection control mechanism for judging an outer peripheral shape of the printing medium based on a signal; and a printing medium detection apparatus for a screen printing machine. 2. The printing medium detection apparatus for a screen printing machine according to claim 1, wherein said detection drive mechanism is capable of detecting a rotation angle of said printing medium from a zero rotation position. 3. The contact bar according to claim 1, wherein said contact bar is disposed at right angles to said displacement sensor.
2. A printing medium detection device for a screen printing machine according to claim 1. 4. The screen printing press according to claim 1, wherein the displacement sensor is capable of detecting an interval from the rotation center for detection of the printing medium to a contact point with the contact bar. Printed object detection device. 5. The printing medium detection apparatus for a screen printing machine according to claim 1, wherein the detection control mechanism outputs an external shape signal detected by the printing medium to the screen printing machine. 6. The detection drive mechanism holds the print medium in a fixed state except for the direction in which the print medium is rotated, and the displacement sensor moves the print medium in a direction of an interval from the detection rotation center. 2. The method according to claim 1, wherein
2. A printing medium detection device for a screen printing machine according to claim 1. 7. The detecting drive mechanism sets the movable state in a direction of an interval from the detecting rotational center, and the displacement sensor sets the fixed state with respect to the contact bar. The printing medium detecting device for a screen printing machine according to claim 1, wherein 8. The screen printing machine has a screen driving mechanism for driving the screen, and a printing medium driving mechanism for driving the printing medium, and based on a detection signal from the detection control mechanism, 2. The printing medium detecting apparatus for a screen printing machine according to claim 1, wherein the screen driving mechanism and the printing medium driving mechanism perform screen printing in synchronization with each other.