JPH0574835U - Structure of print table in screen printing device - Google Patents

Abstract

(57) [Abstract] [Purpose] To stably fix the substrate on the print table by suction, and to prevent static electricity generated during squeezing from being charged on the substrate. [Structure] Since the rubber member 2 is attached to the print table 1 and the rubber member 2 is provided with conductivity, the print table 1 is provided.
A printing tape that can fix the substrate 4 to the bull 1 in a well-fitted state and can mount the substrate 4 without defects such as shots, wire breaks, or bleeding of the printing pattern generated by charging on the substrate 4. Bulls can be easily obtained.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to the structure of a print table of a screen printing device.

[0002]

[Problems to be solved by the prior art and the present proposal]

 Conventionally, a printed circuit board (hereinafter referred to as a board), which is an object to be printed, is sucked and fixed by a negative pressure suction means on a print table, and an ink on the screen plate is squeezed by a squeegee member. A screen printing apparatus which prints a circuit pattern on a substrate surface by squeezing is widely known.

However, in this type of screen printing apparatus, it is an accurate pattern to securely fix the substrate on the printing table by suction from the viewpoint of preventing the substrate from slipping due to squeezing pressure. -It is an absolute requirement for printing. In a printing device that performs the printing process by specifying the printing position in the pre-process of the printing process and positioning this positioned substrate as it is at a predetermined site on the printing table, the substrate on the printing table Reliable fixation of will become more and more important.

Various proposals have been made for means for surely sucking and fixing the substrate on the print table, but there are few proposals considering the relationship between the substrate and the print table surface. In general, the print table is often made of a metal material including the upper surface thereof, and the board is generally made of a relatively hard bakelite material and a copper plate attached to it. It is not always the case.

The present inventor has made various studies as to surely bring the two into close contact with each other by a negative pressure suction force, and as a result, it is simple and rational to dispose an inclusion made of an elastic material between them. We have come to the conclusion that this is an effective measure. It was also found that a rubber member is the most suitable elastic material, but since this rubber member is usually an insulating material, it is the gap between the pressing operation of the squeegee member during the printing process and the copper material surface of the substrate. Recently, it has become clear that it contributes to the evil caused by the static electricity generated by the frictional force. In other words, this static electricity is charged on the substrate due to the presence of the rubber member, so that it is peeled off from the print table in order to carry out the printed substrate, and the spark is provided between the substrate and the print table. As a result, a phenomenon that adversely affects the proper pattern, such as a shot, disconnection, or bleeding of the printed circuit pattern, has been brought about. In addition, it may cause an obstacle to an electronic control mechanism such as a computer.

[0006]

[Means for solving problems]

 The present invention has been made in view of the above-described state of the art, and a rubber member provided with a hole that matches the negative pressure suction hole of the printing table and having conductivity is attached to the printing table. Sticking it on the bull is a means to solve the problem.

[0007]

[Action]

 According to the present plan, a relatively hard and not necessarily flat substrate is made to feel comfortable on the print table due to the interposition of the rubber member having conductivity attached to the print table. Since it is adsorbed, higher reliability is obtained in its fixed state, and static electricity generated during squeezing is surely grounded, so the circuit generated from the charged state on the substrate The phenomena such as pattern shorts, wire breaks, and bleeding are eliminated, and the adverse effects on the electronic control mechanism can be completely prevented.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings.

The print table 1 is formed of a metal member having a flat upper surface, and a suction hole 1a communicating with a negative pressure suction means (not shown) is formed over substantially the entire upper surface. There is. A rubber member 2 is attached to the upper surface of the print table 1, and this rubber member 2 is provided with a hole 2a that matches the suction hole 1a of the print table 1.

The rubber member 2 is attached to one surface of a printing table with a heat-drying ink which is generally widely used as a medium for printing a circuit pattern provided on a screen plate 3 on a substrate 4. From the viewpoint of avoiding the above, it is preferable to use a fluorine-based material having water repellency such as butadiene or Teflon. Further, the rubber member 2 may be provided with an appropriate means, but it is important that the rubber member 2 has conductivity.

Reference numeral 3 in the figure denotes a screen plate provided with a predetermined circuit pattern as described above, in which the ink i on the screen plate 3 is squeezed by the squeegee member 5. Then, the circuit pattern is printed on the surface of the substrate 4 on the print table 1. As shown in FIG. 2, the substrate 4 is constructed by adhering a copper plate 4b to a Bakelite material 4a, and the circuit pattern of the screen plate 3 is printed on the surface of the copper plate 4b.

As described above, conductivity is imparted to the rubber member 2 attached to the surface of the print table 1. However, the mode of imparting conductivity may be appropriately determined. It may be applied to the rubber member 2 itself as will be explained, but the present invention is not limited to this. For example, it is possible to have conductivity on an insulating rubber member such as nitrile rubber having a proper elasticity. Alternatively, a sheet member having a hole that matches the hole of the rubber member may be attached. In this case, appropriate consideration needs to be taken in relation to the electrically conductive print table so that the electrically conductive sheet member acts as a ground for static electricity charged on the substrate. Of course.

The example illustrated in FIG. 3 is a case where conductivity is imparted to both the rubber member 2 and the sheet member 6 attached to the rubber member 2. In view of the fact that it is technically and costly that it is difficult to make the member 2 itself a fluorine-based material, conductivity is imparted to the rubber member 2 having conductivity. If the sheet member 6 is made of a water-repellent fluorine-based material, it is possible to prevent the drying ink from adhering to the surface of the printing table 1 and to keep the substrate 4 against the printing table 1 in a proper state. It is a good case that the suction table can be surely maintained and the print table in which the evil caused by the charging on the substrate 4 is completely removed can be easily obtained. It goes without saying that the sheet member 6 having conductivity is provided with the holes 6a that match the holes 2a, 1a of the rubber member 2 and the print table 1.

The substrate 4 that is negatively pressure-adsorbed on the print table 1 through the holes 2 a of the rubber member 2 to which conductivity is imparted is mediated by the rubber member 2 even if there is some distortion. As a result of the entire surface being adsorbed in a well-fitted state, a stable fixed state is maintained, and due to the conductivity imparted to the rubber member 2, static electricity generated during squeezing is not charged on the substrate 4, It is possible to prevent a bad effect such as a circuit pattern disconnection, a short circuit, or a bleeding due to a spark that is generated when the printed circuit board is removed from the print table to carry it out. In the figure, A is a printing station based on the printing table 1 of the present invention, B is an alignment section for presetting the printing position, and C is a section for transporting a printed substrate. Shows.

[0015]

【effect】

 As described above, since the rubber member is attached to the print table and conductivity is imparted to the rubber member in the present proposal, a relatively distorted substrate with a copper material attached to the surface is printed on the print table. In addition to enabling stable negative pressure suction, static electricity that occurs during squeezing does not charge the substrate, which causes problems such as loss time for charge removal, which has been a problem in the past, and removal. The annoyance of being overwhelmed by the search for means is easily dispelled.

[Brief description of drawings]

FIG. 1 is a partially omitted sectional view illustrating a printing table according to the present invention and a squeezing state.

FIG. 2 is a schematic explanatory diagram of a substrate.

FIG. 3 is an explanatory diagram of another embodiment of the print table.

FIG. 4 is an explanatory diagram showing an example of a printing apparatus focusing on a printing process according to the present invention.

[Explanation of symbols]

 1 Printing Table 1a Suction Hole 2 Rubber Member 2a Suction Hole 3 Screen Plate 4 Substrate 6 Sheet Member 6a Suction Hole

Claims (3)

[Scope of utility model registration request] 1. A printed circuit board is fixed to a predetermined position of a printing table by negative pressure suction means, and a circuit pattern is provided.
In a screen printing apparatus for printing the circuit pattern on the substrate surface by squeezing the ink on the screen plate provided with a screen with a squeegee member, the negative pressure of the printing table (1) A rubber member (2) provided with a hole (2a) matching with the suction hole (1a) and having conductivity is attached to the print table (1).
The structure of the print table in the screen printing device, which is characterized by being stuck on the top. 2. A conductive rubber member (2) attached to a print table (1) is provided with a hole (6a) having conductivity and matching with the hole (2a) of the rubber member (2). The printing tape in the screen printing device according to claim 1, wherein the punched sheet (6) of a fluorine-based material is attached.
Bull structure. 3. A screen printing apparatus according to claim 1, wherein the conductive rubber member (2) attached to the print table (1) is made of a fluorine-based material. Structure of print table in.