CN1294009C - Multi-station plane screen process press - Google Patents

Abstract

The invention relates to the field of electronic component manufacturing, and relates to a multi-station plane screen printing machine used in the lamination printing process of chip components. In order to overcome the shortcomings of the prior art that require repeated replacement of screen printing screens and repeated positioning, resulting in poor printing accuracy and low efficiency, the present invention places multi-layer screen printing screens in the screen frame (7) and moves them one by one along the vertical direction. The layers are set on the rotating shaft (11), so that the screen printing screen frame (7) can rotate horizontally around the rotating shaft (11), and is fixed by a limit locking device. The substrate (5) on which the printed film is placed is positioned on the worktable (4) which can move along the vertical direction. When in use, after the screen printing screens of each layer are calibrated and positioned, continuous lamination printing is realized by adjusting the height of the diaphragm, and the multi-layer printing process is integrated into one machine, which effectively solves the problem of multi-electrode lamination printing of chip components. Low repeatability and unstable product performance.

Description

Multi-station flat screen printing machine

(1) Technical field:

The invention relates to the field of electronic component manufacturing, and relates to a multi-station plane screen printing machine used in the lamination printing process of chip components.

(two) background technology:

With the rapid development of the electronic information industry, the demand for chip components has increased significantly. The surface mount component (also known as chip component) industry is growing rapidly around the world, promoting the development of electronic technology and complete machines in the direction of shortness, lightness, integration, intelligence and multi-function.

An important process in the manufacturing process of chip electronic components is the screen printing of internal electrodes. The existing screen printing equipment is mainly single-station, and the main feature of chip components is the laminated printing of internal electrodes, and requires The relative position of the electrodes must be precisely controlled during the stacking process. For example, for the stacking process of chip EMI filters, which involves repeated printing of multiple layers of capacitor electrodes, inductor electrodes and ground terminals, it is difficult for existing single-station equipment Guarantee the accuracy of printing.

When printing multi-layer internal electrodes, the existing method mainly adopts the method of repeatedly replacing the screen printing screen and repeating the positioning. This method inevitably causes the screen printing machine to have poor positioning repeatability, low printing accuracy, and low efficiency. The disadvantage is that the performance consistency and stability of the produced product are poor, so the existing equipment is limited when the multilayer internal electrode components are laminated and printed, which hinders the development of chip components.

At present, in addition to the single-station plane positioning method mentioned above, there are double-station screen printing machines installed side by side at home and abroad. When printing multi-layer electrodes, it is usually to purchase multiple single-station printing machines, and each printing machine completes the printing work of one electrode, which will not only increase the production cost, but also lead to low production efficiency. Although the double-station screen printing machine can solve the problem of low repeat positioning accuracy, it will make it difficult for the equipment to meet the process requirements when printing more than two layers of electrodes. The area increases, the number of operators increases, and the production cost increases. Therefore, how to solve the laminated printing of multi-layer internal electrodes, so as to be economical and convenient is an urgent problem to be solved by screen printing machines.

(3) Contents of the invention:

In order to overcome the shortcomings of poor positioning repeatability, low printing accuracy and low efficiency due to repeated replacement of screen printing screens and repeated positioning in the prior art, the present invention proposes a multi-station planar silk screen capable of stack printing Web printing machine.

The present invention is mainly composed of a positioning locking mechanism, a silk screen mechanism, a guiding mechanism and a driving mechanism, wherein: the positioning locking mechanism is composed of a limit device, a locking device, and a rotating shaft; the guiding mechanism is composed of a limit screw, a frame, and a guide column. .

The technical feature of the present invention is that the multi-layer screen printing screens are mounted on the rotating shaft layer by layer along the vertical direction, and the screen printing screens can rotate horizontally around the rotating shaft and are fixed by a positioning and locking mechanism. The substrate on which the printed film is placed is positioned on the worktable, and the worktable can move vertically. When in use, after the screen printing screens of each layer are calibrated and positioned, continuous layer printing is realized by adjusting the height of the diaphragm.

The present invention adopts a limiting device and a locking device to ensure that the relative position of the multi-layer screen will not change during the printing process, so that the positioning between the internal electrodes is more accurate.

Due to the technical measures adopted in the present invention, the multi-layer printing process is realized in one machine, which effectively solves the problem of low repetition accuracy in multi-electrode stack printing of chip components.

(4) Description of drawings:

Accompanying drawing 1 is the structural representation of multi-station plane screen printing machine;

Accompanying drawing 2 is the structural left view of multi-station plane screen printing machine;

Accompanying drawing 3 is the schematic diagram of stencil frame;

Accompanying drawing 4 is the schematic diagram of locking mechanism.

in:

1-motor 2-drive shaft 3-frame 4-worktable 5-base plate 6-pin

7-Stencil frame 8-Locking plate 9-Limiting shaft 10-Printing head 11-Rotating shaft 12-Fine adjusting screw

13-limit screw 14-bearing seat 15-gear/rack 16-guide post 17-pin 18-limit hole

19-Sliding rail 20-Print head fixing device 21-Print head

(5) Specific implementation methods:

Embodiment one

This embodiment is a three-station flat screen printing machine, which is composed of a positioning and locking mechanism, a screen printing mechanism, a guiding mechanism and a driving mechanism, and will be described in detail below with reference to the accompanying drawings.

Drive mechanism (Fig. 1, Fig. 2): is made up of motor 1, gear/rack 15 and bearing seat 14.

The transmission shaft 2 is fixed on the lower surface of the frame 3 through the bearing seat 14 ; one end of the transmission shaft 2 is connected with the stepping motor 1 , and the other end is connected with the gear 15 . The rack 15 passes through the rack hole in the middle of the table top of the frame 3, one end meshes with the gear 15, and the other end is fixed to the middle of the worktable 4 with screws; the working length of the rack and the gear should be able to meet the working table 4 maximum working stroke.

Guide mechanism: it is made up of limit screw 13, frame 3, guide post 16.

There is a pair of circular holes on the diagonal of the rectangular frame 3, and guide sleeves are installed in the circular holes; the guide post 16 passes through the guide sleeves, and one end is fixed on the lower surface of the worktable 4, and its length should meet the requirements of the worktable 4. The maximum working stroke.

There is also a pair of round holes on another group of diagonals of the frame 3, and the limit screw 13 passes through the round holes, and there is a clearance fit between the two; one end of the limit screw 13 is also fixed on the worktable 4 The length of the lower surface should also meet the maximum working stroke of the worktable 4.

The middle part of frame 3 has the perforation with tooth bar 15.

The base plate 5 is located on the worktable 4, and its working position is defined by positioning pins.

Positioning and locking mechanism (Fig. 4): consists of a limit shaft 9, a locking piece 8, and a rotating shaft 11.

The limiting device, the locking device and the rotating shaft 11 are located on one side of the frame 3 . The rotating shaft 11 is a three-layer stepped shaft, and its lower end is fixed on the upper surface of one side of the frame 3; each step of the rotating shaft 11 corresponds to a layer of stencil frame 7, and its height should meet the thickness of the stencil frame 7; the stencil frame 7. Layers are set on the rotating shaft 11, and any screen frame can rotate horizontally around the rotating shaft 11. The positioning and locking mechanism is composed of a threaded limit shaft 9 and three pairs of threaded metal locking pieces 8, and the metal pieces are layered on the limit shaft 9, and the distance between each pair of metal pieces is greater than or equal to the mesh frame 7 thickness. One end of the threaded shaft 9 is also fixed with the frame 3 . During work, the screen frame 7 of each layer rotates to the working position. After calibration, its position is limited by the limit shaft 9, and the screen frame 7 is locked up and down with the locking piece 8. After one layer of printing work is completed, the locking action of the locking piece 8 of this layer is released, and the screen frame 7 of this layer is rotated around the rotating shaft to the non-working state. So far, the printing work of one station is completed, and the printing work of the next station is continued.

Screen printing mechanism: it is composed of a screen printing screen frame 7, a working table 4, and a printing head 21.

The substrate 5 on which the printed film is placed is positioned on the worktable 4, and the worktable is driven by the gear/rack 15 and can move in the vertical direction.

As shown in Figure 3, the stencil frame has three layers, and the cross section of the frame is stepped. There are two threaded holes on each side, and each threaded hole corresponds to a fine-tuning screw 12 for positioning the screen printing stencil.

The printing head (Fig. 2) is installed on the slide rail 19 and can move horizontally along the slide rail; Limit hole 18 is limited. When working, the stencil frame 7 rotates to the working position. After positioning and locking, adjust the height of the bracket to the height corresponding to the stencil frame, and insert the positioning pins into the corresponding limit holes 18 to complete the positioning action of the cantilever beam. Pull the printing head along the slide rail to complete the printing of a layer of electrodes.

Embodiment two

This embodiment is a five-station flat screen printing machine, which is composed of a positioning and locking mechanism, a screen printing mechanism, a guiding mechanism and a driving mechanism, and will be described in detail below with reference to the accompanying drawings.

Drive mechanism (Fig. 1, Fig. 2): is made up of motor 1, gear/rack 15 and bearing seat 14.

The transmission shaft 2 is fixed on the lower surface of the frame 3 through the bearing seat 14 ; one end of the transmission shaft 2 is connected with the stepping motor 1 , and the other end is connected with the gear 15 . The rack 15 passes through the rack hole located in the frame 3, one end meshes with the gear 15, and the other end is fixed on the middle part of the worktable 4 with screws; the meshing working length of the rack 15 and the gear 15 should be able to satisfy the 4 maximum working stroke.

Guide mechanism: it is made up of limit screw 13, frame 3, guide post 16.

There is a pair of round holes on the diagonal of the rectangular frame 3, and a guide sleeve 16 is installed in the round hole; the guide post 16 passes through the guide sleeve 16, and one end is fixed on the lower surface of the worktable 4, and its height should meet the requirements of the workbench. The maximum working stroke of plate 4.

There is also a pair of circular holes on another set of diagonals of the frame 3, and the limit screw 13 passes through the circular holes, and there is a clearance fit between the two; one end of the limit screw 13 is also fixed on the bottom of the worktable surface, its height should also meet the maximum working stroke of the worktable 4.

The middle part of frame 3 has the perforation with tooth bar 15.

The base plate 5 is located on the worktable 4 and its working position is defined by positioning pins 6 .

Positioning and locking mechanism (Fig. 4): consists of a limit shaft 9, a locking piece 8, and a rotating shaft 11.

The limiting device, the locking device and the rotating shaft 11 are located on one side of the frame 3 . The rotating shaft 11 is a five-layer stepped shaft, and its lower end is fixed on the upper surface of one side of the frame 3. Each step corresponds to a layer of screen frame 7, and its height should meet the thickness of the screen frame 7; the screen frame 7 is layered. Set on the rotating shaft 11, and any screen frame can rotate around the rotating shaft 11 in the horizontal direction. The positioning and locking mechanism is composed of a threaded limit shaft 9 and five pairs of threaded metal locking pieces 8, and the metal pieces are layered on the limit shaft 9, and the distance between each pair of metal pieces is greater than or equal to the mesh frame 7 thickness. One end of the threaded shaft 9 is also fixed with the frame 3 . During work, the screen frame 7 of each layer rotates to the working position. After calibration, its position is limited by the limit shaft 9, and the screen frame 7 is locked up and down with the locking piece 8. After one layer of printing work is completed, the locking action of the locking piece 8 of this layer is released, and the screen frame 7 of this layer is rotated around the rotating shaft to the non-working state. So far, the printing work of one station is completed, and the printing work of the next station is continued.

Screen printing mechanism: it is composed of a screen printing screen frame 7, a working table 4, and a printing head 21.

The substrate 5 on which the printed film is placed is positioned on the worktable 4, and the worktable is driven by the gear/rack 15 and can move in the vertical direction.

As shown in Figure 3, the stencil frame has five layers, and the cross section of the frame is stepped. There are two threaded holes on each side, and each threaded hole corresponds to a fine-tuning screw 12 for positioning the screen printing stencil.

The printing head (Fig. 2) is installed on the slide rail 19 and can move horizontally along the slide rail 19; Limit hole 18 is limited. When working, the stencil frame 7 rotates to the working position. After positioning and locking, adjust the height of the bracket to the height corresponding to the stencil frame, and insert the positioning pins into the corresponding limit holes to complete the positioning action of the cantilever beam. The slide rail pulls the printing head to complete the printing of a layer of electrodes.

The present invention is in use:

First, wipe the equipment clean, and install screen printing screens with different patterns on the screen frame 7 respectively. First place a diaphragm for alignment on the substrate 5, and adjust the alignment of the screen through the alignment cutting line printed on the diaphragm. After the adjustment of each screen is completed, lock it with the fine-tuning screw to prepare for printing.

The film to be printed is fixed on the base plate 5, and the first screen plate is rotated to the working position and then locked by the locking device. After the diaphragm is moved to the working position under the first screen through the transmission of the rack and pinion, the screen printing head is lowered to the working position, the silver paste is coated on the screen printing screen, and the printing head is pulled along the slide rail to complete a layer of electrodes After the printing is completed, lift the screen printing head, and use the stepping motor to make the diaphragm printed with electrodes descend in the vertical direction. Unlock the locking device, rotate the screen frame by 180°, and thus complete the printing of the first layer of inner electrodes.

The electrodes of the first layer are dried, and then the second layer of membrane is laid on and then printed on the second layer. Its working process is the same as above-mentioned situation.

Repeat the above process in turn until printing reaches the required thickness position.

Claims (6)

1. A multi-station plane screen printing machine, comprising a driving mechanism, a positioning locking mechanism, a silk screen mechanism, and a guiding mechanism, is characterized in that: a. The positioning and locking mechanism includes a limit shaft (9), a locking plate (8), and a rotating shaft (11); the guiding mechanism includes a limit screw (13), a frame (3), and a guide post (16); b. The multi-layer screen printing screen frame (7) is set on the rotating shaft (11) layer by layer along the vertical direction, and the screen printing screen can rotate horizontally around the rotating shaft and is fixed by a positioning locking mechanism; c. Position the film to be printed on the worktable (4) through the substrate (5), and the worktable (4) can move in the vertical direction. 2. The multi-station flat screen printing machine as claimed in claim 1, wherein the lower end of the rotating shaft (11) is fixed on the upper surface of the frame (3), and its shape is a multi-layer stepped shaft, and the height of each step should be Meet the thickness of the stencil frame (7). 3. The multi-station flat screen printing machine according to claim 1, characterized in that the limit shaft (9) of the positioning and locking mechanism is a threaded shaft, and the locking pieces (8) are multiple pairs of metal sheets with internal threads , and the locking pieces (8) are set on the limit shaft (9) in layers, and the spacing of each pair of locking pieces (8) is greater than or equal to the thickness of the screen frame (7). 4. The multi-station flat screen printing machine according to claim 2 or 3, characterized in that the limiting device, the locking device and the rotating shaft (11) are all located on one side of the frame (3). 5. The multi-station flat screen printing machine according to claim 1, characterized in that there are fine-tuning screws (12) on each side of the screen frame (7). 6. multi-station flat screen printing machine as claimed in claim 1, characterized in that the slide rail (19) for installing the printing head is a cantilever beam structure, and its support end is fixed on the frame (3), and the support is relatively Positioning holes (18) are provided at the working position of the screen frame.

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