JPH08183160A - Detector for material to be printed for screen printing machine - Google Patents

Abstract

PURPOSE: To provide a detector for material to be printed for a screen printing machine wherein a detecting signal can be outputted to the screen printing machine by detecting an outer peripheral shape of the material to be printed by a simple method such as detecting a rotary angle from a zero rotary position of the material to be printed and a distance from a detecting rotary center, or the like. CONSTITUTION: Attention is paid to the fact that a flat platy contact bar 22 lies between a displacement sensor and a material to be printed P. A driving mechanism for detection 21 rotating the material to be printed P around a rotary center for detection C, a flat platy contact bar 22 capable of coming in contact with an outer peripheral surface of the printed material P to be revolved, a displacement sensor for detecting a distance from a rotary center for detection following revolution of the material to be printed P, and a detection-controlling mechanism 23 which judges an outer peripheral shape of the material to be printed P by a detection signal from the displacement sensor and the driving mechanism for detection 21, are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing material detection device for a screen printing machine, and more particularly to a printing material detection device for a screen printing machine for printing on a printing material having a curved outer peripheral shape. It is about.

[0002]

2. Description of the Related Art In conventional screen printing, it is difficult to detect the outer peripheral shape of an object to be printed having a cross section of various curved shapes, and it is necessary to print a predetermined print content on the outer peripheral surface of the object. Was very difficult.

An overview will be given with reference to FIGS. Figure 5
6 is a perspective view of the printing medium P having a curved surface in cross section, and when screen printing is performed on the printing area A of the curved outer peripheral surface of the printing medium P, the printing medium detection as shown in FIG. A device is conceivable. FIG. 6 is a schematic explanatory diagram of the printing material detection device 2 for the screen printing machine 1. The screen printing machine 1 includes the printing material detection device 2 and the printing control mechanism 3.
A printing medium drive mechanism 4, a screen drive mechanism 5,
Have.

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

The print control mechanism 3 receives the 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 moves to a predetermined plane (X
-Drive in the (Y plane).

The screen drive mechanism 5 drives the screen 8 made of silk, nylon, tetron, stainless steel or the like, and is synchronized with the rotational drive of the printing material P by the printing material driving mechanism 4 with respect to the fixed squeegee 9. Then, the screen 8 is moved.

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

Based on these detection signals, the object to be printed P is printed.
The outer shape of the printing medium P is determined, and the printing medium P and the screen 8 are synchronously driven via the printing medium driving mechanism 4 and the screen driving mechanism 5 based on the determination result to perform screen printing.

However, as shown enlarged 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 smaller, the sensor needle 10 cannot be substantially operated (displaced), and the distance R from the rotation center C for detection is reduced. There is a problem that cannot be detected.

Further, as shown further enlarged 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 deviated from the substantial center line 10C of the sensor needle 10, so that the calculation process for correcting this deviation is troublesome. There is a problem that is.

It should be noted that a tracing cam (not shown) is adopted without detecting the outer peripheral shape of the printing medium P, and the tracing cam follows the outer peripheral surface of the printing medium P to detect the screen printing machine 1. Although it may be possible to perform printing by the method, as in the case of the above-described configuration, it is not practical because the contact operation between the tracing cam and the outer peripheral surface of the printing medium P cannot be performed smoothly. .

In short, the conventional detection device cannot accurately and easily detect the outer peripheral shape of the object to be printed P, so that the object to be printed P having a curved shape cannot be screen-printed. There is a problem.

[0014]

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

Another object of the present invention is to provide a printing material detecting device for a screen printing machine, which is capable of detecting the rotation angle of the printing material from the zero rotation position and the distance from the detection rotation center. To do.

Another object of the present invention is to provide a printing material detecting device for a screen printing machine, which can synchronize the driving of the screen printing machine and the driving of the printing material by a detection signal.

[0017]

That is, the present invention focuses on interposing a flat contact bar between a displacement sensor and an object to be printed, and a screen and an object to be printed using this screen. A squeegee adapted to perform screen printing on a screen, and a printing material detection device for a screen printing machine for detecting the outer shape of the printing material of a screen printing machine having the squeegee, wherein the printing material is rotated for predetermined detection. A detection drive mechanism that rotates around the center, a flat contact bar that can contact the outer peripheral surface of the printing target that is rotated by the detection driving mechanism, and the printing target that is attached to the contact bar. The displacement sensor for detecting the distance from the rotation center for detection along with the rotation of, and the 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 the rotation angle of the printing medium from the zero rotation position.

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

The displacement sensor can detect the distance from the detection rotation center of the printing medium to the contact point with the contact bar.

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

The detection control mechanism keeps the printing medium fixed except in the direction of rotation, and the displacement sensor makes it movable in the direction of the distance from the detection rotation center. You can

The detection control mechanism can make it movable in the direction of the distance from the detection rotation center, and the displacement sensor can make it 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 printing can be performed by synchronizing the screen driving mechanism and the printing medium driving mechanism.

[0024]

In the printing material detecting device for a screen printing machine according to the present invention, since a flat contact bar is interposed between the displacement sensor and the printing material, the contact bar is the outer circumference of the printing material. The contact point that comes into contact with the surface moves in the left-right direction (longitudinal direction) of the contact bar along with the rotation of the printing object, and even if the contact angle between this contact bar and the outer peripheral surface of the printing object 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 in an acute curved surface portion), Since the displacement sensor can be maintained parallel to the length direction (displacement direction), it is possible to reliably realize the displacement of the displacement sensor due to the rotation of the printing material, and to accurately determine the outer peripheral shape of the printing material. To detect Door can be.

Further, since it is possible to detect the rotation angle of the printing medium from the zero rotation position and the distance from the rotation center for detection, it is possible to detect the rotation angle based on these polar coordinates to the screen printing machine. It is possible to realize printing on an object to be printed having a curved cross section, which was impossible.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a printing material detecting device 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 FIGS. 5 to 8 are designated by the same reference numerals, and the detailed description thereof will be omitted.

FIG. 1 is a schematic explanatory view of a printing material detection device 20 for the screen printing machine 1, and FIG. 2 is an enlarged view of the essential parts thereof. The printing material detection device 20 is a detection drive mechanism. 21
(Θ-Y axis control mechanism), a flat plate-shaped 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 has a θ-axis servo motor 24 and a Y-axis servo motor 25.

The θ-axis servomotor 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 servomotor 25 has a distance L from the rotation center C for detection to the outer peripheral surface of the printing medium P in contact with the contact bar 22 (from the rotation center C for detection to the contact bar 22).
It outputs the detection signal by the pulse train of the vertical line which was set up.

The flat contact bar 22 has a displacement sensor 6
The sensor needle 10 is arranged with a predetermined length (a length capable of contacting the outer peripheral surface of the print target P with the rotation of the print target P) in a direction perpendicular to the displacement direction 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 the case of this embodiment, the detection drive mechanism 21 is controlled so that the sensor needle 10 of the displacement sensor 6 is at the stroke center, that is, the stroke of the sensor needle 10 is constant, and the displacement sensor is The rotation center C for detection is rotated once or more with the stroke of 6 being 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 peripheral shape of the printing medium P from these detection signals (pulse trains) and outputs the outer peripheral shape signal to the print control mechanism 3 of the screen printing machine 1.

As shown in the enlarged view of FIG. 2, the sensor needle 10 is provided on the outer peripheral surface of the material P to be printed through a flat contact bar 22.
The contact point S with the contact bar 22 moves in the length direction of the contact bar 22 as the print target P rotates, and the sensor needle 10 is kept at a right angle to the contact bar 22. In this state, the displacement of the sensor needle 10 (displacement of the Y-axis servo motor 25 when detecting by controlling the stroke of the displacement sensor 6 to be constant).
Can be reliably detected regardless of which outer peripheral surface portion of the printing medium P comes into contact.

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

Further, since the outer peripheral shape of the printing medium P can be accurately grasped, not only complete printing but also partial or divided printing, overlapping printing, and single printing information is 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 servo motor 25 with the stroke of the displacement sensor 6 being constant (zero), but the Y-axis servo motor 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 possible to detect the outer peripheral shape of an arbitrary rotating body in which the rotation center C for detection moves in accordance with the rotation. For example, in the printing medium P1 having a general shape as shown in FIG. It may be.

However, the object P2 to be printed 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 brought into contact with each other through the flat contact bar to detect the displacement sensor. The rotation angle and the distance from the rotation center for detection can be detected without fail, and it is possible to screen-print a printing medium having a curved cross section, which has been impossible in the past.

[0041]

[Brief description of drawings]

FIG. 1 is a screen printing machine 1 according to an embodiment of the present invention.
It is a schematic explanatory drawing of the to-be-printed material detection apparatus 20.

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

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

FIG. 4 is a cross-sectional shape diagram of a material to be printed P2 having an outer peripheral concave portion 30 on the outer peripheral surface, which is not a target of detection in the present invention.

FIG. 5 is a perspective view of an object to be printed P having a curved cross section.

FIG. 6 is a schematic explanatory diagram 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 portion.

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

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Screen printing machine 2 Printed material detection device for screen printing machine 3 Printing control mechanism 4 Printing material drive mechanism 5 Screen drive mechanism 6 Displacement sensor 7 Detection control mechanism 8 Screen 9 Squeegee 10 Sensor needle of displacement sensor 6 10C sensor Substantial center line of needle 10 Drive mechanism for detection 20 Printed material detection device for screen printing machine 21 Drive mechanism for detection (θ-Y axis control mechanism) 22 Flat plate contact bar 23 Detection control mechanism 24 For θ axis Servo motor 25 Y-axis servo motor 26 Servo support mechanism for contact bar 22 30 Peripheral recess P, P1, P2 Printed material A Printed area on curved outer peripheral surface of printed material P Zero rotation position θ From zero rotation position T Rotation angle C Rotation center for detection R Distance from rotation center C for detection L Distance from rotation center C for detection ( The length of the perpendicular line standing on the contact bar 22 from the center C) 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 S Contact point between P and contact bar 22

Claims (8)

[Claims] 1. A printing material for a screen printing machine of a screen printing machine, comprising: a screen; and a squeegee which is used together with the screen to perform screen printing on the printing material. A detection device comprising: a detection drive mechanism that rotates the printing medium around a predetermined rotation center for detection; and a flat plate shape that can contact the outer peripheral surface of the printing medium that is rotated by the detection driving mechanism. A contact bar, a displacement sensor attached to the contact bar to detect a distance from the detection rotation center along with the rotation of the printing medium, and a detection from the displacement sensor and the detection drive mechanism. A detection control mechanism for determining the outer peripheral shape of the printing medium according to a signal, and a printing medium detection device for a screen printing machine. 2. The printing material detection device for a screen printing machine according to claim 1, wherein the detection drive mechanism can detect a rotation angle of the printing material from a zero rotation position. 3. The contact bar is arranged at a right angle to the displacement sensor.
A printing material detection device for a screen printing machine as described above. 4. The screen printing machine according to claim 1, wherein the displacement sensor can detect a distance from the detection rotation center of the printing medium to a contact point with the contact bar. Printed material detection device. 5. The printing material detecting device for a screen printing machine according to claim 1, wherein the detection control mechanism outputs the outer shape signal detected by the printing material to the screen printing machine. 6. The detection control mechanism sets the printing medium in a fixed state except in a rotating direction, and the displacement sensor sets the movable state in a direction of a distance from the detection rotation center. Claim 1 characterized in that
A printing material detection device for a screen printing machine as described above. 7. The detection control mechanism makes the movable state in a direction of a distance from the rotation center for detection, and the displacement sensor makes the fixed state with respect to the contact bar. The printed material detection device for a screen printing machine according to claim 1. 8. The screen printing machine comprises a screen drive mechanism for driving the screen and a print medium drive mechanism for driving the print medium, and based on a detection signal from the detection control mechanism, 2. The printing medium detection device 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.