JPH04137840U - screen printing machine - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a screen printing machine that can perform peripheral printing at a constant printing speed on a workpiece whose peripheral surface shape is an ellipse or a polygon. [Configuration] A motor 13 that transfers the workpiece to a fixed screen 25, a motor 21 that rotates the workpiece, a motor 10 that raises and lowers the workpiece, and a squeegee 3.
6 is provided.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a screen printing machine that prints patterns on the circumferential surface of articles such as tubes. Ru.

0002

[Conventional technology]

Consisting of letters and designs on the outer surface of a printing material such as a resin molded product (hereinafter referred to as a work) Screen printing is a printing method that prints designs to produce painted products. As is well known, many fine holes are punched in a thin film to form these holes. A screen is used that has a predetermined printed pattern created by a collection of holes. The workpiece is brought into contact with the bottom surface of the screen, and the screen After supplying ink to the top, squeegee with a spatula-shaped member called a squeegee. The above printing is done on the workpiece by scratching the ink on the surface and letting it ooze out onto the workpiece side. This is a method of painting according to a pattern. According to the screen printing method, Printing with a three-dimensional effect by applying ink to the printing surface and painting it. It has the advantage of being able to

0003 In addition, when the circumferential shape of the workpiece is circular, this screen printing method Peripheral printing is possible.

0004 That is, the peripheral surface of the workpiece is brought into line contact with the screen, and the squeegee mentioned above is placed in line contact with the screen. The wire is brought into contact with the workpiece through the screen at the line contact part, and the contact relationship is kept unchanged. While rotating the workpiece, adjust the screen to match the workpiece rotation speed. By horizontally moving it, it becomes possible to print on the circumferential surface of the workpiece.

[0005] However, the above screen printing method does not work as described above when the workpiece has a circular circumferential surface. It is possible to print on the circumferential surface of sea urchins, but the workpiece has a circumferential shape such as an ellipse or polygon. When it comes to printing, it becomes difficult to print on the peripheral surface as it is. Because these peripheral shapes In the workpiece, the diameter from the center of the workpiece to the circumferential surface changes continuously in the circumferential direction. , when the workpiece is rotated, the circumferential surface of the workpiece separates from the screen, causing the workpiece to rotate. Proper line contact between the squeegee, screen and workpiece is not achieved and therefore the workpiece This is because printing on the circumferential surface of the arc becomes impossible.

[0006] Therefore, for example, in Japanese Patent Application Laid-Open No. 63-283952, As a screen printing method for a workpiece, the workpiece Wa is kept constant as shown in Fig. 8. The workpiece Wa is rotated in the direction of the arrow r around the workpiece support center P by angle. The workpiece is rotated so that the circumferential surface of the workpiece is always in contact with screen A, Control the workpiece Wa up and down in the direction of the arrow y, and ensure that the printed pattern is in correct contact with the circumferential surface of the workpiece. Feed screen A in the direction of arrow x and move squeegee B in the direction of arrow z so that A technique for controlling this is disclosed.

[0007] According to this, even if the work Wa is a non-circular article such as an ellipse, the work Wa Regardless of the rotation of the workpiece Wa, the lifting and lowering control of the workpiece always keeps the workpiece Wa and the Since the contact state with the lean A is maintained, peripheral printing is possible.

[0008]

[Problem that the idea aims to solve]

By the way, in the above-mentioned elliptical workpiece Wa, the center of the workpiece is From P, the diameter of each part of the circumferential surface of the workpiece changes continuously in the circumferential direction. On the other hand, stated in the above publication The technology rotates the workpiece Wa at a constant speed and sets a screen at the rotation angle. Since the movement of squeegee A and squeegee B is controlled to match, the The circumferential speed of the part of the workpiece that makes line contact with the screen A changes as the workpiece rotates. . Therefore, the squeegee B must also be moved in accordance with the change in the peripheral speed, and the printing speed The degree of painting becomes inconsistent, making it difficult to obtain high-quality painting.

[0009] Furthermore, in the case of the technique disclosed in the above-mentioned publication, the circumferential surface shape is only a curved surface such as an ellipse. It is possible to print on the circumferential surface of a workpiece, but it is possible to print on the circumference of a workpiece that is a polygon consisting of a curved surface and a flat surface. In this case, the technology prints based on the constant rotational speed of the work This makes it difficult to print on flat parts, making it difficult to print on polygonal workpieces. There is an inconvenience that you can't do it due to injury.

0010 Therefore, the present invention is capable of printing at a constant printing speed on the circumferential surface of the workpiece. In addition, painting can be performed not only on curved surfaces but also on circumferential workpieces with flat surfaces. Our goal is to provide a screen printing machine that can

[0011]

[Means to solve the problem]

In other words, the screen printing machine of the present invention connects the squeegee and the printing material with fine holes. A screen with a predetermined print pattern formed on it is sandwiched between the two sides. While rotating the substrate while maintaining the contact state, rotate the screen. The ink supplied to the top surface is scratched with a squeegee to print a pattern on the circumference of the substrate. A screen printing machine in which the substrate is placed against a fixed screen. a substrate transport means for transferring the substrate in the direction; and a substrate rotation means for rotating the substrate. , a printing material lifting means for raising and lowering the printing material, and a ski for moving the squeegee. and a means for moving the print material, and the transfer of the printing material is always carried out so that the circumferential surface of the printing material is Each of the above means is controlled so that the printing is performed while in contact with a clean surface, and the above printing material is When an object is in contact with the screen at a curved part of its circumferential shape, the contact area The circumferential speed of the printing material is kept constant in minutes, and the printing material is a flat part of its circumferential shape. Stop the movement and rotation of the substrate when it is in contact with the screen in minutes. It is characterized by being equipped with a control means for moving only the squeegee to the end of the straight section. Ru.

0012

[Effect]

According to the present invention having the above configuration, the screen is fixed and the marking is applied to the screen. In addition to moving the printing material and squeegee, it also controls the rotation of the printing material. Ru. Therefore, in printing materials with curved surfaces such as circular or oval surfaces, is the rotation of the substrate so that the circumferential speed at the line contact portion with the screen is constant. The speed can be controlled and the printing speed can be kept constant during circumferential printing. Wear.

[0013] Furthermore, if the printing material includes a flat part, the printing material can be scanned in that flat part. When in contact with a clean surface, stop moving and rotating the substrate and ski. Since only the image is moved to the edge of the flat part, printing on the flat part is not possible. For example, it is now possible to print on the periphery of a substrate whose periphery is polygonal. In that case, the same printing speed as the curved surface can be obtained by changing the squeegee movement speed. By controlling the printing speed so that the printing speed is constant, it becomes possible to print on the circumferential surface at a constant printing speed.

[0014]

【Example】

Next, embodiments of the present invention will be described based on the drawings.

[0015] FIG. 1 is a schematic diagram showing the overall configuration of a screen printing machine 1. The printing press 1 has an elevating table 3 on the front of the main body frame 2. A pair of vertical guide rods 4, 4 on the left and right sides are provided on the back of the lifting table 3. The lifting table 3 can be raised and lowered by passing through the sleeve 5 (see Fig. 2). It can be attached to the main body frame 2 in a functional manner. In addition, the inside of the lifting table 3 in the left and right direction is In the center part, the female threaded sleeve 6 (see Figure 3) provided on the back of the table is The screw shaft 7 located at is screwed together and inserted, and by the rotation of this screw shaft 7 3 can be raised and lowered. In that case, the upper end of the screw shaft 7 is attached to the main body frame. It is rotatably supported by a bearing 8 in 2, and its lower end is supported by a support frame 9. It is connected to the motor 10 for lifting and lowering the work in a supported state, and is rotated by the motor 10. It is said to be configured to be transferred. Therefore, the work lifting motor 10 cannot be rotated. For example, the elevating table 3 moves up or down depending on the direction of rotation.

[0016] On the upper surface of the lifting table 3, guide rails 11 are provided in the left and right direction of the table 3. A pair of guide rails 11 are provided at the front and rear, and the same guide rails 11 and 11 are provided between the guide rails 11 and 11 A screw shaft 12 extending in the direction of The screw shaft 12 is connected to a feed motor 13 (see FIG. 1), and the screw shaft 12 is The shaft 12 is rotatably driven. These guide rails 11, 11 The screw shaft 12 controls the horizontal feeding of a work chuck means 14, which will be described next. vinegar That is, the work chuck means 14 has an upward U-shape as shown in FIGS. 2 and 3. The support member 15 has a support member 15, and engagement members 16, 16 are provided on the bottom surface of the support member 15. a female threaded sleeve 17 disposed between the engagement members 16, 16; With the engaging members 16, 16 engaged with the guide rails 11, 11, the screw shaft 1 2 is screwed and inserted into the female threaded sleeve 17, so that the workpiece transfer described above is possible. By rotating the screw shaft 12 with the feed motor 13, the The support member 15 or the work chuck means 14 moves in either the left or right direction. It is configured as follows.

[0017] In the above-mentioned work chuck means 14, the supporting member 15 has a receiving plate 18 and a chuck. A workpiece W is positioned between the two, and the workpiece W is placed between them. With the bottom of the workpiece W in contact with the receiving plate 18, the air cylinder 20 is used to The chuck plate 19 is moved forward and the pin 19a formed on the chuck plate 19 is inserted into the workpiece. By pushing the workpiece W into the mouth of the workpiece W, the workpiece W is chucked by the support member 15. It is made to be done. In addition, the receiving plate 18 and the chuck plate 19 are It is rotatably attached to the support member 15 in order to rotate the workpiece W that has been rotated. In both figures, the rotational force of the work rotation motor 21 attached to the back side of the support member 15 is shown. 3 through the worm gear 22 and worm wheel 23, and the receiving plate 18. It is configured to rotate. Therefore, the receiving plate 18 rotates. The workpiece W in the chucked state is rotated.

[0018] Furthermore, the above-mentioned chuck means 14 is moved to a position above the lifting table 3. Two approximately U-shaped screens are installed on the left and right from the main body frame 2 toward the top of the trajectory. The screen mounting frames 24, 24 protrude oppositely, and these screen mounting frames 24, 24 A screen 25 is inserted from the front between the By holding the peripheral frame 27 of the horn 25 to the screen mounting frames 24, 24, The screen 25 is configured to be fixed.

[0019] In addition, a pair of front and rear guide rails 28 and 28 are provided at the upper end of the main body frame 2, respectively. The screw shaft 2 is provided to extend in the left and right direction, and a screw shaft 2 is provided between both guide rails 28, 28. A squeegee moving motor 30 is provided on the upper surface of one end of the main body frame 2. A screw shaft 29 is connected to. The guide rails 28, 28 and the screw shaft 29 are 31 in the left and right direction, and the bottom surface of the traveling base 31 is provided with engaging members 32, 3. 2 and a female threaded sleeve 33 are provided, and the engaging members 32, 32 are connected to the guide rail. 28, 28, the above-mentioned screw shaft 29 is screwed into the female threaded sleeve 33, and As the screw shaft 29 is rotated by the drive of the squeegee moving motor 30, The traveling base 31 is configured to travel in either the left or right direction depending on the direction of rotation. being done.

[0020] The traveling platform 31 is provided with an arm 34 extending directly above the screen 25. At the same time, a support plate 35 is attached to the arm 34 directly above the screen 25. The squeegee 36 and the ink returner 37 are held on the support plate 35. the In this case, the squeegee 36 and the ink returner 37 are connected to air cylinders 38 and 39, respectively. It is held by and can be moved up and down.

[0021] Next, the general operation of the screen printing machine 1 having the above configuration will be explained, and will be described later. This will help understand the control of workpieces of individual shapes.

[0022] Workpieces W1, W2, W having shapes shown in FIGS. 5 to 7 are mounted on the workpiece chuck means 14. 3 is set, the lifting platform 32 and the workpiece are moved by the work lifting motor 10. The workpieces W1 to W3 are lifted, and the peripheral surfaces of these works W1 to W3 are fixed. It is applied to the lower surface of the screen 25 by line contact, and the line contact part is The squeegee 36 is brought into contact with the works W1 to W3 through the screen 25, and From the state where ink is being supplied onto the clean 25, the workpiece transfer motor 13 and 5 to 7 by starting the workpiece rotation motor 21. Send it to the left side. Also, when the workpieces W1 to W3 rotate, the circumferential surface of the workpieces is rotated. The circumferential shape of the workpiece is designed so that it does not move away from the clean 25 or push up against it. The height of the workpieces W1 to W3 is adjusted by controlling the workpiece lifting motor 10 according to the . On the other hand, in the squeegee 36, the squeegee movement motor 30 36 is moved in the same direction as the workpieces W1 to W3, and at the same time the workpiece W 1 to W3 maintain the contact state at the part where they are in line contact with the screen 25. controlled. This causes the ink on the screen to form a collection of holes on the screen 25. It oozes out to the workpiece side through the printed pattern drawn by the workpiece W1~ A pattern is printed on the circumferential surface of the workpiece by one rotation of W3.

[0023] By the way, as is clear from FIGS. 5 to 7, the works W1 to W3 are individual The peripheral surface shape differs depending on the workpiece. Therefore, the control circuit shown in Fig. 4 is provided. ing. That is, the control circuit controls the lifting and lowering of the workpiece W and the lifting table 3. The work lifting motor 10 controls the movement of the work W and the chuck means 14. A workpiece transfer motor 13 and a workpiece rotation unit that rotates the workpiece W and the receiving plate 18. A squeegee movement that controls the movement of the diversion motor 21, the traveling table 31, and the squeegee 36. motor 30, and an air cylinder that raises and lowers the squeegee 36 and ink returner 37. 38 and 39 are connected to the controller 40. In that case, controller 4 0 consists of a storage section 40a and a control section 40b, and the storage section 40a stores the word to be printed. Data corresponding to the types of blocks W1 to W3 are stored, and based on this stored data, the above control each motor 10, 13, 21, 30 and air cylinders 38, 39. It is done like this. In that case, the stored data is the one shown in FIGS. According to the circumferential shape of each workpiece W1 to W3 and the dimensions such as the curvature of each part of the circumferential surface. , the lifting amount, work transfer speed, rotation speed, and speed of each workpiece W1 to W3. This is data that controls the speed of movement of the key. And in that case control, work Regarding the curved surface portions W1 to W3, the workpiece has a constant circumferential speed relative to the screen 25. (that is, at a constant printing speed), the workpiece rotates and moves on the flat surface. Stop the transfer, move only the squeegee 36, and move the squeegee 36 at that time. The moving speed of the screen 36 is such that the workpiece is in contact with the screen 25 at a constant circumferential speed. Make sure that the printing speed is the same as that obtained with .

[0024] In other words, if the workpiece W1 is circular as shown in FIG. The workpiece rotates at a constant speed about the rotation center P1 while in line contact with the workpiece 25. At the same time, if the workpiece W1 is transferred at a constant speed, the line relative to the screen 25 is The circumferential speed of the workpiece W1 at the contact part is constant at any part of the workpiece's entire circumference. Alternatively, the squeegee 36 may also be moved at a constant speed that is the same as the transfer speed of the workpiece W1. Further, since the circumferential surface is circular, there is no need to raise and lower the workpiece W1. therefore , for this workpiece W1, the workpiece transfer motor is 13. Drive the work rotation motor 21 and the squeegee movement motor 30 at constant speed. There is no need to move the workpiece W1 up and down. Motor 10 is not driven.

[0025] On the other hand, if the workpiece W2 has an elliptical circumferential surface as shown in FIG. If the workpiece W2 is transferred while being rotated, the workpiece W2 will be transferred from the screen 25. The workpiece W2 should always be in line contact with the screen 25. It needs to be raised and lowered. In addition, the workpiece W2 is rotated at a constant speed around the workpiece rotation center P2. If the screen 25 is rotated, the circumferential speed of the part that is in line contact with the screen 25 will change according to the rotation. Therefore, the rotational speed and transfer speed of the workpiece W2 should be controlled so that the circumferential speed is constant. At the same time, the moving speed of the squeegee 36 must be controlled accordingly to reduce the work load. The squeegee 36 is always located at the part where the screen 25 is in line contact with the screen 25. must be done. Therefore, in the workpiece W2 having an elliptical circumferential surface, Set with the screen 25 always in contact with the screen 25 despite rotational movement. The workpiece lifting motor 10 and the workpiece transfer motor 1 are 3. Variable control of the rotation speed of the work rotation motor 21 from the start to the end of printing In both cases, the rotational speed of the squeegee moving motor 3 is also variably controlled.

[0026] Further, the workpiece W3 has a polygonal peripheral surface having a flat part and a curved part as shown in FIG. In the case of , workpiece W3 is moved up and down in the same way as in the case of an elliptical circumferential surface, and The rotational speed and transfer speed of the workpiece W3 around P3 are variably controlled, and the workpiece W3 is 3 is set so that it is always in contact with the screen 25 regardless of rotational movement. It is necessary to control the speed of each motor 10, 13, 21, 30 so that the circumferential speed can be obtained. However, in the workpiece W3 having a flat part, the flat part is parallel to the screen 25. Printing cannot be performed unless the transport and rotation of the workpiece W3 is stopped when it comes into contact with the workpiece W3. Therefore, in the workpiece W3 having a polygonal circumferential surface, the workpiece lifting motor is 10. Stop each of the work transfer motor 13 and the work rotation motor 21. , by driving only the squeegee moving motor 30, the squeegee 36 maintains a constant printing speed. Control is performed to move the plane portion (range L1 in FIG. 7). In that case , the moving speed of the squeegee 36 is the same as the printing speed when the circumferential speed of the curved surface portion is constant. It is controlled so that printing can be performed on flat areas. Also, the squeegee 36 moves to flatten the surface. When the end of the part is reached, the work lifting motor 10 and the work transport motor 13 are turned on again. , and the workpiece rotation motor 21 are driven, and the curved surface with a constant circumferential speed as described above is Printing is done on the part.

[0027] In this way, data for workpieces W1 to W3 of various shapes and dimensions can be controlled in advance. Since it is stored in the storage section 40a of the printer 40, the word to be printed is stored in the storage section 40a of the printer 40. By reading the memory data of the workpiece and having it controlled by the control unit 40b, the workpiece This means that printing can be automatically performed according to the circumferential shape of the wheels W1 to W3.

[0028] By the way, the above control is based on the peripheral shape of the fixed screen 25. vertical movement amount of the workpiece, workpiece transfer speed, workpiece rotation speed, squeegee movement speed This is done by controlling the Therefore, the reference is zero momentum. Since the screen 25 is used, control becomes simple and accurate.

[0029] Also, workpieces W1 to W3 are moved relative to the fixed screen 25. , the circumferential speed of the part where the workpieces W1 to W3 are in contact with the screen 25 is Since it is controlled to be constant even in parts, the printing speed for the workpiece is constant. , Therefore, it becomes possible to apply high-quality painting.

[0030] Furthermore, for the workpiece W3 including a flat part, the flat part is on the screen 2. 5, the transfer and rotation of the workpiece W3 is stopped, and only the squeegee 36 is transferred. Since we are printing on flat areas by moving the It is possible to print on works W1 to W3 with circumferential shapes such as polygons, and can print on a wide range of workpieces. A screen printing machine that can handle square shapes can be obtained.

[0031]

[Effect of the idea]

As is clear from the above description, according to the present invention, the fixed screen The amount of vertical movement of the workpiece, the workpiece transfer speed, and the workpiece rotation according to the circumferential shape relative to the This is done by controlling the rolling speed and squeegee movement speed. Therefore, control Since the reference is a screen with zero momentum, control is easy and You will be able to do it accurately.

[0032] Also, fix the screen as described above, and place the printing material and material against the screen. At the same time as the squeegee is moved, the rotation of the printing material is controlled. death Therefore, for printing materials that have curved parts such as circular or oval peripheral surfaces, , the rotational speed of the substrate is adjusted so that the peripheral speed at the line contact portion with the screen is constant. It is possible to control the printing speed and keep the printing speed constant during circumferential printing. This makes it possible to perform high-quality painting.

[0033] Furthermore, if the printing material includes a flat part, the printing material can be scanned in that flat part. When in contact with a clean surface, stop moving and rotating the substrate and ski. Since only the image is moved to the edge of the flat part, printing on the flat part is not possible. For example, it is now possible to print on the periphery of a substrate whose periphery is polygonal. In that case, the same printing speed as the curved surface can be obtained by changing the squeegee movement speed. By controlling the printing speed so that the printing speed is constant, it becomes possible to print on the circumferential surface at a constant printing speed. child Therefore, it is possible to handle a wide range of workpiece shapes and apply high-quality painting to them. Ru.

[Brief explanation of drawings]

FIG. 1 is a schematic front view of a screen printing machine according to the present invention.

FIG. 2 is a side view of the main parts of the screen printing machine.

FIG. 3 is a cross-sectional view of the same screen printing machine.

[Figure 4] Control circuit diagram of the screen printing machine.

FIG. 5 is an explanatory diagram of printing control operation in the case of a circular workpiece.

FIG. 6 is an explanatory diagram of print control operation for an elliptical workpiece.

FIG. 7 is an explanatory diagram of printing operation in the case of a triangular workpiece.

FIG. 8 is an explanatory diagram of a conventional print control operation.

[Explanation of symbols]

1 Screen printing machine 10 Workpiece lifting motor 13 Workpiece transfer motor 21 Work rotation motor 25 Screen 30 Squeegee movement motor 36 Squeegee 40 Controller W, W1~W3 Work

Claims (1)

[Scope of utility model registration request] Claim 1: A squeegee and a substrate are brought into vertical contact with a screen on which a predetermined print pattern is formed by fine holes interposed therebetween, and the substrate is rotated while maintaining the opposed state. This is a screen printing machine that prints a pattern on the circumferential surface of the printing material by scraping the ink supplied to the top surface of the screen with a squeegee while moving the screen, and the printing material is transferred in one direction relative to the fixed screen. It has a printing material transporting means, a printing material rotation means for rotating the printing material, a printing material lifting means for raising and lowering the printing material, and a squeegee moving means for moving the squeegee, and the printing material is constantly transported. When the above-mentioned means are controlled so that the circumferential surface of the printed matter is in contact with the screen, and when the above-mentioned printed material is in contact with the screen at a curved portion of its circumferential shape, the Keep the circumferential speed of the printing material constant, and when the printing material is in contact with the screen with a flat part of its circumferential shape, stop the movement and rotation of the printing material and move only the squeegee to the edge of the flat part. A screen printing machine characterized by comprising a control means for moving the screen.