JPS61172741A - Method and apparatus for positioning material to be printed on mount stand in screen printing - Google Patents

Abstract

PURPOSE:To eliminate the distortion of a material to be printed, by a method wherein the position of the material to be printed is set in the advance direction thereof and, when a moving member presses the side surface of the material to be printed to a fixed member at the time of the positional determination of the material to be printed in the direction at a right angle to said advance direction, the movement of the moving member is stopped in this state. CONSTITUTION:A material M to be printed is fed onto a mount stand 2 by a feeder 11 and the positional setting thereof in its advance direction is performed through the contact with a positioning pin P. Subsequently, a moving member 4 moves to the direction of a fixed member 3 in this state while the contact part 4b thereof is contacted with the side surface M' of the material M to be printed. When the other end M<2> of the material M to be printed is contacted with the fixed member 3, a slip phenomenon is generated between a power transmission shaft 9 and the shaft 5a of a power source by the action of a hysteresis clutch member HC. Therefore, the moving member 4 is stopped regardless of the driving force of a power source 5. As a result, the pressing force of the moving member 4 to the material M to be printed becomes uniform and the distortion of the material to be printed is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a method and apparatus for positioning a printing material on a mounting table in screen printing.

``Prior art'' ``Problems to be solved by the invention'' In screen printing, in which a predetermined pattern formed on a screen plate is printed onto a printing material, the printing material is usually a printing table or , a positioning process is performed in advance in relation to a predetermined pattern formed on the above-mentioned screen plate on a printing material mounting table such as a positioning processing unit located immediately in front of a printing table, and The positioning process of the printing medium is an essential process for accurate printing process.

In the process of positioning the printing material on the mounting table, various processing methods have been considered and have been actually implemented, but these methods are based on the positioning of the printing material on the mounting table. In many processing methods, the position is first determined and then the position in the direction perpendicular to the printing medium is determined, and in this processing method, particular attention is paid to the positioning in the direction perpendicular to the traveling direction of the printing medium.

That is, after the position in the traveling direction is specified, one side of the printing medium is pressed by some means in a direction perpendicular to the traveling direction until the other side stops at a predetermined position. -The reality is that it is difficult to adjust the pressure from the sides.

The printing substrate in screen printing is usually 0.8n~1
．． Most of them are thin plates with a length of about 6 m, and if the pressing force applied to them becomes excessive, the problem will be immediately exposed as distortion of the printing material. It is clear that distortion phenomena of the printing substrate and unstable positioning of the printing substrate due to insufficient pressing force are serious drawbacks to accurate screen printing processes, and those skilled in the art are concerned about solving them. was crushing. In addition, to adjust the pressing force on the side of the printing material,
It may be possible to interpose a coil spring or air cylinder in the pressing means to ensure that the pressing force is neither too much nor too little, but fine adjustment of these inclusions is an extremely difficult problem, and it is difficult to make precise and accurate adjustments. , it was not possible to sufficiently respond to the demand for rapid positioning processing. The present invention is intended to overcome this drawback of the prior art.

"Means for solving the problem" The means for solving the problem of the present invention is as described in the claims, and includes means for determining the position of the printing material on the mounting table in the traveling direction, and A printing material mounting section is set which includes a fixed member and a movable member located opposite to the fixed member in a direction perpendicular to the direction of travel, and the movable member is moved by receiving power from a power source capable of forward and reverse rotation. After determining the position in the traveling direction of the printing material carried onto the mounting table, the movable member moves toward the fixed member and presses the printing material against the fixed member. The technical means for solving the problem is to stop the movement of the movable member in the applied state regardless of the driving force of the power source.

1. Effects ``Example'' Next, examples of the present invention will be described along with an explanation of the effects according to the description of the apparatus according to the present invention.

The printing material mounting section 1 includes a mounting table 2 on which the carried printing material M is placed, a retractable positioning bin P for positioning the printing material M in the traveling direction, and a positioning bin P for positioning the printing material M in the traveling direction. It is composed of a fixed member 3 for positioning in a direction perpendicular to the direction, and a movable member 4 located opposite to this fixed member 3.

The mounting table 2 here is often a printing table on which screen printing processing is performed after positioning, but in some cases it may be a table dedicated to positioning the printing material located immediately in front of the printing table.

The fixed member 3 is fixedly installed on one side of the mounting table 2, and the movable member 4, which moves relative to the fixed member 8, moves forward and backward in a guide groove S provided in the mounting table 2. It is something. Therefore, it is preferable to provide a plurality of moving members 4 from the viewpoint of achieving a uniform pressing force on the side surface M' of the printing medium M. Further, the movable member 4 is held by a belt member 6 that moves forward and backward by receiving power from a power source 5 capable of forward and reverse rotation, and the belt member 6
It consists of a leg portion 4a that connects with the printing medium and a contact portion 4b that contacts the side surface M' of the printing medium M.

In addition, in the case where a plurality of contact parts 4b of the moving member 4 are preferably provided, each contact part 4b may be formed by attaching an integral plate-like member to a separate leg part 4a. . The belt member 6 that holds the moving member 4 is hung on a pair of pulleys 7.8, and one of the pulleys 7 is connected to the printing machine below the printing material mounting table 2 by an appropriate means via a support shaft 7a. The other pulley 8 receives power from a power transmission shaft 9 via a support shaft 8a.

There is a mechanism in advance between the power transmission shaft 9 and the drive shaft 5a of the power source 5 so that a slip phenomenon will occur between the two, that is, the power transmission shaft 9 and the drive shaft 5a, if a state other than the set transmission torque occurs. A torque transmission mechanism is involved. Various structures can be considered for such a torque transmission mechanism, but here, a hysteresis clutch member He is used, which utilizes the hysteresis characteristics of a permanent magnet and has a non-contact structure that transmits torque only by electromagnetic force. .

Therefore, the power source shut 5a and the power transmission shaft 9 are integrated in this hysteresis clutch member HC by the appropriate balance of magnetic force of the electromagnet E.
If the drive of the power transmission shaft 9 is obstructed by adjusting the electromagnetic force to a suitable value in advance, a slip service phenomenon will occur between the power source 5a and the power transmission shaft 9, and the power The driving of the power transmission shaft 9 can be stopped regardless of the driving force of the source 5. In other words, the movement of the moving member 4 can be smoothly stopped while maintaining this state with one side M of the printing medium pressed against the fixed member 3. In addition to the hysteresis clutch member HC, there is a so-called powder clutch member (not shown) that uses charged iron powder as a medium that has a similar effect. Preferably, the clutch member HO is used.

Reference numeral 10 shown in the figure is a groove provided in the mounting table 2, into which the conveyor 11 is mounted.

The printing medium M is carried onto the mounting table 2 by the conveyance tool 11, and its positioning in the direction of movement is performed by contacting the positioning pin P. Next, in this state, the movable member 4 moves in the direction of the opposing fixing member 3 while bringing its abutting portion 4b into contact with the side surface M1 of the printing material M, and eventually brings the other side surface M of the printing material M into contact with the fixing member. However, at this time, the power transmission shaft 9 which was giving driving force to the belt member 6 by the action of the hysteresis clutch member He and the power source shirt)
A slip phenomenon occurs between the movable member 4 and the movable member 5a, and the movable member 4 stops regardless of the driving force of the power source 5. The printing material M that has completed positioning in the traveling direction and the right angle direction may be subjected to printing processing on the mounting table 2 which has been positioned in a predetermined process afterward.
In some cases, the paper may be transported to a printing process located behind the paper while maintaining the positioning state.

Note that when all the positioning is completed, the positioning pin P sinks below the mounting table 2, and after the printing process is completed or after the printing medium M is discharged to the next process while maintaining the positioning state. The movable member 4 returns to its original position by the reverse drive of the power source 5, and at the same time, the positioning pin P also protrudes to its original position. in this case,
Since the movement of the belt member 6, that is, the drive of the power transmission shaft 9, does not require any mW, the hysteresis clutch member H
Of course, C transmits the power of the power source 5 which is driven in reverse to the power transmission shaft 9.

"Effects of the Invention" As described above, in the positioning of the printing material on the mounting table, the moving member is moved relative to the fixed member after the printing material is positioned in the traveling direction of the printing material, and then the moving member is moved in the perpendicular direction. When the movable member presses the side surface of the printing material against the fixed member, it can be stopped smoothly regardless of the driving force of the power source. There is no excess or deficiency in the pressing force, and the phenomenon of distortion of the printing material that often occurs due to excessive pressing force is completely eliminated, making it possible to accurately and quickly position the printing material on the mounting table. became.

[Brief explanation of the drawing]

FIG. 1 is a schematic top view illustrating a device according to the present invention, FIG. 2 is a schematic cross-sectional view taken along the line AA in FIG. 1, and FIG. 3 is a conceptual explanatory diagram of a hysteresis clutch member. DESCRIPTION OF SYMBOLS 1... Printing material, mounting part, 2... Mounting table 3... Fixed member, 4... Moving member, 5... Power source 5a... Shut, 6... Belt member 9 ... Power transmission shaft HO ... Hysteresis clutch member (torque transmission mechanism), M ... Printing material, P ... Positioning pin patented λ
;Kaito Az mouth/Komancho 1 original Figure 1 Figure 2

Claims (2)

[Claims] (1) In the positioning process of the printing material in screen printing, in which the printing material is positioned on the mounting table in a direction perpendicular to its traveling direction, it has a means for positioning the printing material carried onto the mounting table in the traveling direction. and a belt member that moves by receiving power from a power source capable of forward and reverse rotation. After the moving member moves toward the fixed member and presses the printed material against the fixed member, the moving member moves toward the fixed member and presses the printed material against the fixed member. A method for positioning a printing material on a mounting table in screen printing, characterized in that the movement of a moving member is stopped regardless of the driving force of a power source. (2) A positioning pin that can be retracted and retracted in the direction of movement of the printing material carried on the mounting table is provided, and a fixed member and a movable member located opposite to this fixed member are arranged in the direction perpendicular to the positioning pin. Set the printing material placement section, and
The movable member is held by a belt member that moves by receiving power from a power source capable of forward and reverse rotation, and a torque other than the predetermined transmission torque is applied between the power transmission shaft that transmits power to the belt member and the drive shut of the power source. 1. A device for positioning a printing material on a mounting table, characterized in that a torque transmission mechanism is interposed so that a slip phenomenon occurs between the two when the state is reached.