JPH0555787A - Automatic width changing method for guide rails for conveying board - Google Patents

Abstract

PURPOSE:To shorten a time required to regulate an interval between side guides by first moving a guide rail at a high speed to overrun a moving origin and to roughly stop it when the position of the guide rail is confirmed, and then slowing moving it to the origin to accurately stop it at the origin. CONSTITUTION:When a pulse motor 4 is first rotated forward at a high speed to move a guide rail 2 at a high speed toward a moving origin (b) and then stopped by a sensor PH of the origin (b), it is overrun and stopped at a position b1. Then, when it is reversely rotated and stopped by the sensor PH, it is reversely overrun and stopped at a position b2. Thereafter, when it is rotated forward at a low speed and stopped by the sensor PH, it is accurately stopped at the position (b). Since a distance 1 from the origin (b) to a target position (c) is known, the motor 4 is so instructed that the rail 2 moves at the distance 1, and the rail 2 is accurately stopped at the position (c).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for automatically shifting a guide rail for transferring a substrate, and more particularly to a means for changing the interval between the guide rails at a high speed when the type of the board is changed.

[0002]

2. Description of the Related Art A line for mounting electronic components on a board is composed of a screen printing device for printing a circuit pattern or cream solder on the substrate, a mounting device for mounting electronic components on the substrate, a reflow device for heat treatment of solder, and the like. Therefore, the mounting work is carried out while the substrate is being conveyed by the guide rails along the line.

When the size of the board changes due to the change of the kind of the board, the interval between the guide rails must be adjusted accordingly. FIG. 4 shows a conventional crossing method for adjusting the distance. In the figure, reference numerals 1 and 2 denote a fixed guide rail and a movable guide rail which are arranged in parallel to each other, and the movable guide rail 2 moves in the lateral direction N along the ball screw 3. PH is a sensor such as a photoelectric element, and is provided at the moving origin of the movable guide rail 2.

A pulse motor 4 is mainly used for driving the ball screw 3 for reasons of cost.
The pulse motor 4 is driven by a command pulse, but unlike the servo motor, since it does not have a feedback means, the current position of the guide rail 2 is unknown.
Therefore, since it is not possible to directly move from the current position to the target position, conventionally, the guide rail 2
Was moved to the target position to adjust the distance between the guide rails 1 and 2.

In FIG. 4, a is the current position, b is the origin of movement, and c is the target position, and the gap between the guide rails 1 and 2 is to be changed from L1 to L2 in accordance with the change of the board type. It is a thing.

First, the pulse motor 4 is normally rotated to move the guide rail 2 from the current position a toward the moving origin b by N.
When the sensor PH detects the guide rail 2 in one direction, the drive of the pulse motor 4 is immediately stopped and the guide rail 2 is stopped at the movement origin b.

Next, the pulse motor 4 is reversely rotated to move the guide rail 2 toward the target position c at a high speed,
When the target position c is approached, the rotation speed of the pulse motor 4 is reduced and stopped at the target position c.

[0008]

FIG. 5 shows the rotation speed of the pulse motor 4 in the above operation. As shown in the figure, the pulse motor 4 rotates at a low speed from the current position a to the moving origin b. The reason is as follows. That is, when the pulse motor 4 is rotated at high speed and the guide rail 2 is moved toward the movement origin b at high speed, even if the sensor PH detects the guide rail 2 and a stop command is issued, the guide rail 2 Cannot stop immediately,
In FIG. 4, the position b ′ is overrun and the current position of the guide rail 2 cannot be known.

Therefore, in the conventional means, when the sensor PH detects the guide rail 2, the pulse motor 4 is rotated at a low speed so that the guide rail 2 can be stopped accurately at the moving origin b immediately. The position is slowly moved from the position a to the movement origin b.

However, if the rotation speed of the pulse motor 4 is slow, it takes a long time T'to move from the current position a to the movement origin b, and the distance between the guide rails 1 and 2 accompanying the substrate type change. There was a problem that adjustment could not be done quickly.

Therefore, it is an object of the present invention to provide a method capable of adjusting the distance between guide rails at a high speed.

[0012]

To this end, the present invention provides
(I) The pulse motor is rotated in the forward direction to move one of the guide rails at a high speed toward the moving origin, and the sensor provided at the moving origin is overrun, whereby the guide rail is roughly stopped. (Ii) Next, by rotating the pulse motor in the reverse direction, the guide rail is moved in the reverse direction and the sensor is overrun in the direction opposite to the case of (i), and (iii) By positively rotating the pulse motor at a low speed, the guide rail is slowly moved toward the sensor and accurately stopped at the moving origin, and (iv) then the pulse motor is reversely rotated at a high speed. Move the guide rail to the target position at high speed,
(V) Next, decrease the rotation speed of the pulse motor,
The guide rail is stopped at the target position.

[0013]

According to the above construction, the guide rail can be moved from the current position to the moving origin at a high speed, so that the time required for adjusting the interval between the guide rails can be greatly shortened.

[0014]

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

FIG. 1 is a perspective view of an automatic guide rail shifting device. The same parts as those of the conventional means shown in FIG. In the figure, 5 is a slider mounted on the movable guide rail 2, and 6 is a linear rail for guiding the sliding of the slider 5. Reference numeral 7 is a base plate, 8 is a dog attached to the slider 5, and 9 is a substrate conveyed along the guide rails 1 and 2. The dog 8 blocks the sensor PH to detect the guide rail 2.

FIG. 2 is a plan view for explaining the lateral approach method. Now, the current position of the guide rail 2 is a,
The distance between the guide rails 1 and 2 is L1, and the guide rail 2 is moved to the target position c as follows so that the distance between the guide rails 1 and 2 becomes L2 as the type of the substrate 9 changes. ..

Since the driving means of the guide rail 2 is the pulse motor 4, the current position a is unknown. Therefore, the guide rail 2 is first moved to the movement origin b to confirm the position. This confirmation is performed as follows. First, the pulse motor 4 is normally rotated at high speed to move the guide rail 2 at high speed toward the movement origin b (see arrow N1 in FIG. 2 and T1 in FIG. 3). When the sensor PH installed at the moving origin b detects the guide rail 2, the pulse motor 4 stops driving, but since the guide rail 2 is moving at a high speed, the pulse motor 4 cannot be stopped immediately and the moving origin b is not detected. Overrun and make a rough stop at position b1.

Next, the pulse motor 4 is reversely rotated to move the guide rail 2 in the opposite direction, and when the sensor PH detects it, the pulse motor 4 is stopped again. As a result, the guide rail 2 overruns the sensor PH in the opposite direction to the above case and stops at the position b2 (see arrow N2 in FIG. 2 and T2 in FIG. 3).

Next, the pulse motor 4 is normally rotated at a low speed to slowly move the guide rail 2 in the N3 direction,
When the sensor PH detects the guide rail 2, the pulse motor 4 is stopped (see T3 in FIG. 3). Since the movement in the N3 direction is low, the guide rail 2 stops accurately at the movement origin b. The guide rail 2 may be slowly moved in the N2 direction from the position b1 by rotating the pulse motor 4 in the reverse direction at a low speed, and may be accurately stopped at the movement origin b.

In this way, if the guide rail 2 is accurately stopped at the moving origin b, the distance 1 from the moving origin b to the target position c is known, so the guide rail 2 moves by this distance l. The pulse motor 4 is instructed to do so. Then, the pulse motor 4 reversely rotates at a high speed, the guide rail 2 moves toward the target position c in the N4 direction at a high speed, and when approaching the target position c, the guide rail 2 does not overrun the target position c. The pulse motor 4
Then, the guide rail 2 is accurately stopped at the target position c.

That is, in the above method, in order to shorten the moving time, first, the guide rail 2 is moved at a high speed to intentionally overrun the moving origin b to make a rough stop, and then slowly move the origin b. By moving it toward the moving origin b, the moving time is accurately stopped, and the time required to move from the current position a to the moving origin b is T (T1 + T2 + T3) in FIG. As described above, by moving the guide rail 2 from the current position a to the position b1 at high speed, this time T is
This is much shorter than the time T'required by the conventional means indicated by, and the adjustment of the distance between the guide rails 1 and 2 can be completed in a short time. In the above embodiment, one guide rail 1 is fixed and only the other guide rail 2 is moved, but the present invention can also be applied to an automatic width-shifting device that moves both guide rails together. It is a thing.

[0022]

As described above, according to the present invention,
Since the guide rail can be moved from the current position to the moving origin at a high speed, the time required for the width can be greatly shortened and the change of the board type can be dealt with quickly.

[Brief description of drawings]

FIG. 1 is a perspective view of an automatic substrate widthing device according to the present invention.

FIG. 2 is an explanatory diagram of an operation according to the present invention.

FIG. 3 is a speed chart of a pulse motor according to the present invention.

FIG. 4 is an explanatory diagram of the operation of conventional means.

FIG. 5 is a speed chart of a pulse motor of a conventional means.

[Explanation of symbols]

 1 Guide rail 2 Guide rail 3 Ball screw 4 Pulse motor 9 Board PH sensor b Moving origin

Claims (2)

[Claims] 1. An automatic width-arrangement method for a guide rail for carrying a substrate, wherein at least one of the two parallel guide rails is moved along a ball screw to adjust the distance between the guide rails. , (I) Rotate the pulse motor forward to move one of the guide rails at a high speed toward the moving origin, and overrun the sensor provided at the moving origin to roughen the guide rail. (Ii) Then, by rotating the pulse motor in the reverse direction, the guide rail is moved in the reverse direction to cause the sensor to overrun in the reverse direction to the case of (i), and (iii) By positively rotating the pulse motor at a low speed, the guide rail is slowly moved toward the sensor and accurately stopped at the movement origin, iv) Next, the pulse motor is reversely rotated at a high speed to move the guide rail toward the target position at a high speed, and (v) the rotation speed of the pulse motor is then reduced to move the guide rail. A method for automatically shifting a guide rail for substrate transfer to a stop position at a target position. 2. A method of automatically widening a guide rail for carrying a substrate, wherein at least one of the two parallel guide rails is moved along a ball screw to adjust the distance between the guide rails. , (I) Rotate the pulse motor forward to move one of the guide rails at a high speed toward the moving origin, and overrun the sensor provided at the moving origin to roughen the guide rail. Stop (ii) then slowly rotate the pulse motor backwards at a low speed to slowly move the guide rail toward the sensor and accurately stop at the moving origin, (iii) then move the pulse motor Reverse rotation at high speed to move the guide rail toward the target position at high speed, and (iv) Next, reduce the rotation speed of the pulse motor. So, the substrate auto-paper side method conveyance guide rails, characterized in that so as to stop the guide rail at the target position.