JP2013135046A - Double side mounting substrate manufacturing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce an elevation time of a backup table in a double side mounting substrate manufacturing device.SOLUTION: In a double side mounting substrate manufacturing device, a printed circuit board on both upper and lower faces of which electronic components are mounted is conveyed to a mounting position A1, and the electronic components are mounted on the upper face of the printed circuit board. After mounting the electronic components, the printed circuit board is conveyed out. A servo motor 2 is provided as an elevation actuator for elevating a backup table 1. The servo motor 2 moves the backup table downward from a reference face of the mounting position A1 during conveying the printed circuit board with a position obtained by adding a total of a maximum height of the electronic components already mounted on the lower face of the printed circuit board conveyed to the mounting position A1 and thickness of the printed circuit board to a predetermined clearance as a lower limit position.

Description

  The present invention relates to a mounting board manufacturing apparatus that manufactures a mounting board by mounting electronic components such as IC chips on a printed board, and more particularly, double-sided mounting that manufactures a double-sided mounting board in which electronic components are mounted on both upper and lower surfaces of the printed board. The present invention relates to a substrate manufacturing apparatus. In this specification, an electronic component is also simply referred to as a component.

  Generally, a mounting board manufacturing apparatus (electronic component mounting apparatus) sucks an electronic component by a suction nozzle in a component supply unit, transfers it to a printed board stopped at a mounting position, and places it on a predetermined position on the printed board. It is configured to be implemented. Also, below the printed circuit board stopped at the mounting position, there is a backup table configured by raising a plurality of backup pins on the plate. The lower surface of the printed circuit board is supported from below (for example, Patent Document 1).

  On the other hand, as a mounting board manufacturing apparatus, there is also known a double-side mounting board manufacturing apparatus that manufactures a double-side mounting board in which electronic components are mounted on both upper and lower surfaces of a printed board (for example, Patent Document 2). In such a double-sided mounting board manufacturing apparatus, components may already be mounted on the lower surface of the printed board carried into the mounting position. Therefore, when the printed circuit board is carried into the mounting position, the backup table described above needs to be lowered so as not to interfere with the components mounted on the lower surface of the printed circuit board. Then, it is necessary to raise the backup table at the time of mounting, and to lower the backup table again when carrying out the mounted printed board.

  As described above, in the double-sided mounting board manufacturing apparatus, it is necessary to raise and lower the backup table in accordance with a series of processes including loading of the printed board, mounting of components, and unloading of the printed board. Conventionally, an air cylinder is generally used as a lift actuator for a backup table, and the lower limit position of the backup table is fixed at a fixed position based on the maximum height of components that can be mounted on a printed circuit board. That is, in the conventional double-sided mounting board manufacturing apparatus, the position where a predetermined clearance (gap) is added to the maximum height of components that may be mounted in the double-sided mounting board manufacturing apparatus is set as the lower limit position of the backup table, The backup table has been raised and lowered with this lower limit position as a reference.

  As described above, the back-up and lowering of the backup table is repeatedly performed in accordance with a series of processes of loading the printed circuit board, mounting components, and unloading the printed circuit board. Therefore, shortening the back-and-forth time of the backup table greatly contributes to the improvement of productivity. For this reason, especially in a double-sided mounting board manufacturing apparatus, it has been required to shorten the back-and-forth time of the backup table.

JP 2006-237316 A JP 2010-56347 A

  The problem to be solved by the present invention is to shorten the back-and-forth time of the backup table in the double-sided mounting board manufacturing apparatus.

  In the present invention, a printed circuit board on which electronic components are mounted on both upper and lower surfaces is carried into a mounting position, the electronic component is mounted on the upper surface of the printed circuit board stopped at the mounting position, and the printed circuit board is unloaded after mounting the electronic component. A backup table is provided below the printed circuit board that stops at the mounting position, and when mounting electronic components, the backup table is raised and the lower surface of the printed circuit board is supported by the backup table from below. In a double-sided mounting board manufacturing apparatus that lowers the backup table at the time of loading and unloading, a servo motor is provided as a lifting actuator for raising and lowering the backup table, and the servo motor is loaded into the mounting position below the reference surface of the mounting position. Already mounted on the bottom surface of the printed circuit board The position obtained by adding a predetermined clearance to the sum of the maximum height and the print thickness of the substrate of the component as a lower limit position, characterized in that lowering the backup table when loading and unloading the printed circuit board.

  The double-sided mounting board manufacturing apparatus of the present invention has a configuration for controlling the operation of the servo motor, and the maximum height of electronic components already mounted on the lower surface of the printed board carried into the mounting position and the thickness of the plate board. A data input unit for inputting a height, a lower limit position calculating unit for calculating the lower limit position based on the input maximum height and thickness of the electronic component and a predetermined clearance, and the lower limit A servo operation manager command unit that commands the operation of the servo motor with the lower limit position calculated by the position calculation unit as a reference may be provided.

  In the present invention, the backup table can be configured by raising a plurality of backup pins on a plate and supporting the lower surface of the printed circuit board from below by the backup pins.

  According to the present invention, the lower limit position of the backup table is determined based on the maximum height data of the electronic components already mounted on the lower surface of the printed board carried into the mounting position and the thickness data of the printed circuit board. The back-and-forth stroke of the backup table can be minimized. Therefore, the raising / lowering time of a backup table can be shortened and productivity can be improved.

  In addition, since the servo motor is used as the lifting actuator for raising and lowering the backup table, the raising and lowering of the backup table can be precisely controlled. Conventionally used air cylinders had to wait for a certain period of time until the position became stable at the upper and lower limit positions, but servo motors do not require the waiting time described above, which also improves productivity. Can be made.

It is a front view which shows one Embodiment of the double-sided mounting board manufacturing apparatus of this invention. It is explanatory drawing which shows the basic operation | movement of the double-sided mounting board manufacturing apparatus of FIG. It is a block diagram which shows the structure for controlling operation | movement of a servomotor in the double-sided mounting board manufacturing apparatus of FIG. It is a flowchart which shows the processing flow of the lower limit position calculating part shown in FIG. It is explanatory drawing which shows the difference in the raising / lowering stroke of the backup table of this invention and a prior art example, (a) is this invention, (b) is a prior art example.

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

  FIG. 1 is a front view showing an embodiment of a double-sided mounting board manufacturing apparatus of the present invention.

  The backup table 1 is disposed so as to be movable up and down below a mounting position A1 where electronic components are mounted in a transport path A that transports a printed circuit board. The backup table 1 is configured by raising a plurality of backup pins 1b on a plate 1a.

  In addition, a servo motor 2 is provided as a lift actuator that lifts and lowers the backup table 1, and the backup table 1 moves up and down by the operation of the servo motor 2. Specifically, a nut 5 is attached to a screw shaft 4 connected to the motor shaft of the servo motor 2 by a gear mechanism 3, and the plate 1 a of the backup table 1 is fixed to the nut 5. As a result, the screw shaft 4 is rotated by the operation of the servo motor 2, and the nut 5 is moved up and down along with this, so that the backup table 1 is moved up and down. In FIG. 1, reference numeral 6 denotes a guide plate that guides the raising and lowering of the backup pin 1 b of the backup table 1.

  FIG. 2 is an explanatory diagram showing the basic operation of the double-sided mounting board manufacturing apparatus of FIG.

  FIG. 2A shows a state immediately before the printed circuit board PCB having the component C already mounted on the lower surface is carried into the mounting position A1. At this time, the backup table 1 is lowered to the lower limit position so as not to interfere with the component C when the printed circuit board PCB is carried. In the present invention, the lower limit position of the backup table 1 is determined based on the maximum height h of the component C already mounted on the lower surface of the printed circuit board PCB carried into the mounting position A1 and the thickness t of the printed circuit board PCB. . Specifically, the lower limit position of the backup table 1 (the upper end surface of the backup pin 1b) is the maximum height of the component C below the height of the reference surface As at the mounting position that matches the upper surface level of the printed circuit board PCB. This is a position obtained by adding a predetermined clearance α to the sum of the thickness h and the thickness t of the plate substrate PCB. That is, the lower limit position of the backup table 1 is a position (t + h + α) downward from the reference surface As of the mounting position.

  When no component is mounted on the lower surface of the plate substrate PCB, the maximum height h of the component is 0. Further, when a plurality of components are mounted on the lower surface of the plate substrate PCB, the maximum height is naturally set to h. On the other hand, the clearance α is set in advance in consideration of the dimensional tolerance of the printed circuit board and components, the accuracy of horizontal conveyance of the printed circuit board, and the like.

  When the printed circuit board PCB is carried into the mounting position A1, the backup table 1 is lowered to the lower limit position, and when the printed circuit board PCB is carried into the mounting position A1, as shown in FIG. The backup table 1 is raised and the lower surface of the printed circuit board PCB is supported from below by the backup pins 1b. In this state, components (not shown) are mounted on the upper surface of the printed circuit board PCB. Next, when unloading the printed circuit board PCB after mounting, the backup table 1 is lowered to the lower limit position as shown in FIG. The backup table 1 repeats the above lifting operation every time a component is mounted on the printed circuit board PCB.

  The backup table is moved up and down by the operation of the servo motor as described with reference to FIG. That is, the servo motor operates so that the backup table moves up and down with reference to the lower limit position.

  In order to control the operation of such a servo motor, the double-sided mounting board manufacturing apparatus of this embodiment includes a data input unit, a lower limit position calculation unit, and a servo operation command unit as shown in FIG. In the data input unit, the maximum height of the electronic component already mounted on the lower surface of the printed board carried into the mounting position and the thickness of the plate substrate are input. Data on the maximum height of the electronic component and the thickness of the plate substrate can be obtained from a production program (production plan), and the input data is stored in a memory. The maximum height of the electronic component and the thickness of the plate substrate may be stored in a database corresponding to the type of the printed circuit board.

  The lower limit position calculation unit calculates the lower limit position described in FIG. 2 based on the input maximum height of the electronic component, the thickness of the plate substrate, and a predetermined clearance set in advance. That is, the lower limit position is a position of (plate substrate thickness + maximum height of electronic component + clearance) downward from the reference surface of the mounting position. The servo operation command unit commands the operation of the servo motor with reference to the lower limit position calculated by the lower limit position calculation unit.

  FIG. 4 shows a process flow of the lower limit position calculation unit. The lower limit position calculator confirms that the maximum height of the electronic component and the thickness of the printed circuit board stored in the memory have been successfully obtained, and calculates the lower limit position in the manner described above. Then, the lower limit position calculation unit confirms that the calculation of the lower limit position is successful, determines the lower limit position, and sends it to the servo operation command unit shown in FIG.

  FIG. 5 is an explanatory diagram showing the difference in the lift stroke of the backup table between the present invention and the conventional example. FIG. 5A shows the present invention. As described above, the backup table 1 has a position where the clearance α is added to the sum of the maximum height of the component C and the thickness of the printed circuit board PCB, downward from the reference surface of the mounting position. Therefore, the back-and-forth stroke of the backup table 1 can be minimized. On the other hand, in the conventional example shown in FIG. 5B, as described in the background section, the position obtained by adding a predetermined clearance to the maximum height of a component that may be mounted is set as the lower limit position. The lower limit position is a constant position regardless of the maximum height of the component C actually mounted on the lower surface of the printed circuit board PCB. Therefore, when the present invention is compared with the conventional example in the example of FIG. 5, the elevation stroke of the backup table 1 is shortened by the length L in the present invention. Since the backup table 1 repeatedly moves up and down each time components are mounted on the printed circuit board PCB, shortening the lifting stroke greatly contributes to improvement in productivity.

  When the present inventor simulated the productivity improvement effect of the present invention, the transfer control time (from the time when the backup table starts to descend at the mounting position, the next printed circuit board is carried into the mounting position and the backup table is completely raised. The time until the point of time) was approximately 5 seconds in the conventional example (using an air cylinder as the lifting actuator for the backup table), but was shortened to approximately 3.7 seconds in the present invention.

1 Backup Table 1a Plate 1b Backup Pin 2 Servo Motor 3 Gear Mechanism 4 Screw Shaft 5 Nut 6 Guide Plate A Transport Path A1 Mounting Position PCB Printed Circuit Board C Parts

Claims (3)

It is configured to carry a printed circuit board on which electronic components are mounted on both the upper and lower surfaces to the mounting position, mount the electronic component on the upper surface of the printed circuit board stopped at the mounting position, and carry out the printed circuit board after mounting the electronic component. A backup table is provided below the printed circuit board that stops at the mounting position, and when mounting electronic components, the backup table is raised to support the lower surface of the printed circuit board from below, and the printed circuit board is loaded and unloaded. Sometimes in a double-sided mounting board manufacturing device that lowers the backup table,
A servo motor is provided as a lifting actuator that lifts and lowers the backup table.
The servo motor has a predetermined clearance below the reference surface of the mounting position, the total height of the electronic components already mounted on the lower surface of the printed board carried into the mounting position and the thickness of the printed board. A double-sided mounting board manufacturing apparatus characterized in that the backup table is lowered when a printed board is carried in and out, with the position added with the lower limit position.   A data input unit for inputting the maximum height of the electronic component and the thickness of the plate substrate that are already mounted on the lower surface of the printed board carried into the mounting position; and the input maximum height of the electronic component and the plate substrate A lower limit position calculation unit that calculates the lower limit position based on a thickness and a predetermined clearance set in advance, and a servo operation controller that commands the operation of the servo motor based on the lower limit position calculated by the lower limit position calculation unit. The double-sided mounting board manufacturing apparatus according to claim 1, further comprising a command unit.   The double-sided mounting board manufacturing apparatus according to claim 1, wherein the backup table is configured by raising a plurality of backup pins on a plate, and supports the lower surface of the printed board from below by the backup pins.

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