JP4666823B2 - Board backup mechanism for electronic component mounting equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is equipped with an electronic component mounting apparatus, and supports one surface of a substrate at a place where no electronic component exists when mounting the component on the other surface of the substrate on which the component is mounted on one surface. More particularly, the substrate backup mechanism that prevents the electronic components mounted on one surface of the substrate from being automatically supported to support the substrate and the substrate backup mechanism using the same are used. The present invention relates to a substrate backup method.
[0002]
[Prior art]
Conventionally, in an electronic component mounting apparatus that automatically mounts electronic components on the surface of a substrate, in order to prevent distortion and warping of the substrate being processed, a substrate backup mechanism having a plurality of backup pins can be used. One surface is supported from below. In addition, in the electronic component mounting apparatus, it is necessary to process a plurality of types of substrates having different sizes and shapes, or a substrate on which an electronic component has already been mounted on one surface, so that these substrates can be appropriately supported, There has been proposed a substrate backup mechanism that can selectively change the position of the backup pin in accordance with the substrate.
[0003]
As a prior art example of this type of substrate backup mechanism, for example, one disclosed in Japanese Patent Laid-Open No. 4-127500 is known. As shown in FIG. 10, the board backup mechanism includes a plurality of backup pins 101 extending in the vertical direction, a backup pin drive unit 102 that moves the backup pins 101 up and down independently, and a backup pin that moves up and down. The control unit 103 that designates 101 and the detection unit 104 that detects the position of the electronic component 106 mounted on the substrate 105 are provided.
[0004]
The backup pins 101 are arranged in a matrix of m rows and n columns, and an air cylinder (not shown) is connected to the lower end of each backup pin 101. The backup pin 101 moves up and down when the backup pin drive unit 102 controls opening and closing of a solenoid valve (not shown) attached to each air cylinder.
[0005]
The detection unit 104 includes a plurality of rod-shaped sensors 107 arranged in the same manner as the backup pin 101, and the position of the electronic component 106 mounted on the substrate 105 arranged at the electronic component detection position is determined by these sensors. Detect at 107. This detection information is sent to the control unit 103, and the control unit 103 controls the backup pin driving unit 102 so that the backup pin 101 at the location where the electronic component 106 does not exist, and the substrate 105 placed at the backup position is controlled. Make a backup.
[0006]
Instead of detecting the position of the electronic component 106 by the detection unit 104, a barcode label encoded with information representing the type of the substrate 105 is pasted on the substrate 105, and the barcode label information is displayed on the barcode reader. The backup pin driving unit 102 is controlled based on this information, and the backup pin 101 can be selected and set.
[0007]
Japanese Laid-Open Patent Publication No. 2000-91799 proposes a substrate backup mechanism that solves the problems of the substrate backup mechanism described above. As shown in FIG. 2, this substrate backup mechanism includes backup pins 201 arranged in a matrix of m rows and n columns, and air cylinders 202 connected to each, and each backup pin 201 located in one row. The first air passages 203 for supplying and exhausting air to and from the air cylinders 202 that drive the air cylinders are provided for each row, and the first switching valves 204 that can switch the supply and exhaust of air to the first air passages 203. And a second air passage 205 for supplying and exhausting air to and from the air cylinder 202 that drives each backup pin 201 positioned in a row is provided for each row, and the air to each second air passage 205 is provided. A second switching valve 206 capable of switching the supply and discharge of the air, and a third air passage 207 for supplying and discharging air to and from all the air cylinders 202 integrally. Provided, it is provided a third switching valve 208 capable of switching air supply and discharge of the third air passage 207.
[0008]
Each air cylinder 202 raises the backup pin 201 when the first air passage 203 is switched to the air discharge state and the second air passage 205 is switched to the air supply state with the backup pin 201 in the lower end position. After the ascent, as long as the third air passage 207 is in the air supply state, the backup pin 201 is held in the ascending position regardless of the state of the other passages. According to such a configuration, each backup pin can be driven up and down rationally with a small number of valves, so that the air supply / discharge system can be simplified and the occupied space and cost can be reduced. it can.
[0009]
[Problems to be solved by the invention]
In the conventional substrate backup mechanism as described above, since it is necessary to perform valve control for each backup pin, for each row, and for each column, there is a problem that it takes time to set up backup. In the latter case, the backup pins that have been raised cannot be lowered individually. Therefore, in order to lower the backup pins that have been raised by mistake, it is necessary to lower all the backup pins once and start over from the beginning. There was a lot of trouble.
[0010]
In the former, valves are provided on all backup pin air cylinders, so the cost is very high. The latter also has a smaller number of valves than the former, but each row and each column. Since each valve is provided, the cost is high. Moreover, in the latter, since it is necessary to control the valves in each row and each column in a matrix manner, the valve mechanism and its control system become very complicated.
[0011]
Further, in the former, in order to detect the position of the electronic component attached to the board, a detection unit including a sensor arranged in the same manner as the backup pin is separately provided, and based on the information obtained by this detection unit The backup pin is selectively driven, or the information on the barcode label attached to the substrate is read by a barcode reader, and the backup pin is selectively driven based on this information. In the latter, a specific method such as such a detection unit or barcode is not disclosed, but the position of the electronic component attached to the board is detected by some method, or the position of the electronic component is previously detected. Although the information can be taught to a computer or the like and the valve opening / closing control is performed based on the teaching, the backup pin can be automatically set, but a detection unit and teaching unit are required. Therefore, in any case, the cost is very high, and time and labor are required for detection and teaching.
[0012]
The present invention has been made in view of the above-mentioned problems, and its purpose is to be able to be manufactured at a low cost with a simple structure and to detect the position of an electronic component attached to a substrate by an operator, An object of the present invention is to provide a substrate backup mechanism that does not require teaching.
[0015]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention of claim 1 is to back up the lower surface of the substrate on which the electronic component is mounted at a predetermined position in a place where the electronic component does not exist. A plurality of backup pins protruding upward from the upper surface of the base and attached to the base so as to be movable in the vertical direction, and the respective backup pins are urged downward to maintain the lower end position. A resilient member, a force imparting means for imparting a drag force that rises against the urging force of the resilient member to each backup pin, and each backup pin is provided detachably; a plurality of stopper for locking the backup pin when projected to a position abutting the lower surface of the substrate, to extend in the horizontal direction on the upper surface of the base A sliding body that is slidably engaged with the formed linear groove, and a driving means that slides the sliding body in both directions, and each stopper has an upper surface of the sliding body via a vertical support shaft. And is urged toward the corresponding backup pin, and is engaged with a groove formed on the outer peripheral portion of the backup pin to lock the backup pin. When the sliding body slides in one direction with the backup pins locked by the stoppers, the stoppers engaged with the grooves are detached from the grooves, and the plurality of backup pins are unlocked. A board backup mechanism for an electronic component mounting apparatus, characterized in that it is configured as described above.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. 1 is a plan view of a substrate backup mechanism according to an embodiment of the present invention, FIG. 2 is a sectional view taken along line XX of FIG. 1, FIG. 3 is a sectional view taken along line YY of FIG. ZZ sectional drawing, FIGS. 5-9 is explanatory drawing of an effect | action of the board | substrate backup mechanism of FIG.
[0018]
As shown in FIGS. 1 and 2, the substrate backup mechanism of this embodiment includes a substantially rectangular parallelepiped base 1 and a plurality of cylindrical backup pins 2 protruding upward from the upper surface of the base 1. 2, and so on. The backup pins 2, 2,... Are accommodated in holes 3, 3,... Formed in the base 1 and extending in the vertical direction, and are movable in the vertical direction.
[0019]
A flange-like piston portion 2a projecting sideways is formed at the lower end portion of each backup pin 2, and a rod-like projection 2b projecting downward is formed on the lower surface thereof. In addition, a groove 2c is formed in the middle portion of the backup pin 2 over the entire circumference.
[0020]
The hole 3 is a small-diameter portion 3a formed such that the upper end portion is in sliding contact with the outer peripheral portion of the backup pin 2, and the lower portion thereof has an enlarged diameter so that the piston portion 2a can be moved up and down. The large-diameter portion 3b is formed so as to be able to. The lower end portion of the large diameter portion 3 b of each hole 3 communicates with an air supply path 4 formed in the base 1, and an air pressure source is connected to the air supply path 4 via a valve (solenoid valve) 5. (Drag giving means) 6 is connected in communication.
[0021]
A coil spring (biasing means) 7 is coaxially wound around the outer periphery of each backup pin 2. The upper end portion of the coil spring 7 is in contact with the upper surface of the large diameter portion 3 b of the hole 3, and the lower end portion thereof is in contact with the upper surface of the piston portion 2 a of the backup pin 2 to urge the backup pin 2 downward.
[0022]
On the upper surface of the base 1, a rectangular plate-like stopper (locking means) 8 that is fixed to the base 1 when the backup pin 2 protrudes a predetermined length from the upper surface of the base 1 is provided for each backup pin 2. Is provided. In addition, a pair of rectangular grooves 9 and 9 are formed on the upper surface of the base 1 so as to extend in the left-right direction in FIG. 1, and a rectangular bar-like sliding body 10 is slidable in each of them. Is engaged.
[0023]
As shown in FIG. 7, one end of each sliding body 10 is connected to a piston rod 11 a (not shown) of a cylinder 11 (driving means) arranged so as to be aligned with the sliding body 10. An air pressure source 12 is connected in communication. In a state where the air pressure source 12 is not driven, the piston rod 11a of the cylinder 11 is maintained in a retracted state by the spring 11b. When the pneumatic pressure source 12 is driven, the piston rod 11a slides in the left direction in FIG. 7 against the urging force of the spring 11b. When the pneumatic pressure source 12 is stopped, the piston rod 11a slides in the right direction. It returns to its original position.
[0024]
On the upper surface of each sliding body 10, recesses 10 a, 10 a,... Having a parallelogram shape in plan view are formed so as to alternately correspond to the respective stoppers 8. One end of each stopper 8 is housed in the corresponding recess 10a and pivotally supported via a stepped screw (vertical support shaft) 13 in the horizontal direction. A torsion spring 14 is concentrically wound around the outer periphery of each stepped screw 13, and one end of the torsion spring 14 engages with the outer periphery of a cylindrical locking portion 15 protruding from the upper surface of the stopper 8. The end engages with the outer peripheral portion of a cylindrical locking portion 16 protruding from the upper surface of the sliding body 10, and biases the stopper 8 in a direction in contact with the outer peripheral portion of the corresponding backup pin 2.
[0025]
Next, the operation of the substrate backup mechanism described above will be described.
When the substrate on which the electronic component is mounted on the lower surface is positioned at a predetermined position above the substrate backup mechanism, a substrate pressing plate (not shown) descends to the upper surface of the substrate and presses the substrate so as not to rise. Further, high pressure air is supplied into the air supply path 4 from the air pressure source 6, and this high pressure air flows into each hole 3 and raises each backup pin 2 against the elasticity of the coil spring 7.
[0026]
As shown in FIG. 5, each backup pin 2 rises until the upper end contacts the substrate 20 or the electronic component 21 mounted on the lower surface thereof. The distance D from the lower surface of the substrate 20 to the upper surface of the stopper 8 is set to be substantially equal to the distance d from the upper end of the backup pin 2 to the upper end of the groove 2c, and the backup pin 2 contacts the lower surface of the substrate 20. The stopper 8 enters the groove 2c by the action of the spring 14 almost at the same time as reaching the contact position (upper end position). On the other hand, in the backup pin 2 in contact with the electronic component 21, since the groove 2c does not reach the position of the stopper 8, the stopper 8 does not enter the groove 2c.
[0027]
Next, the valve 5 is closed, and as a result, the ascending force due to the high pressure air of the air source 6 does not act on each backup pin 2, so that each backup pin 2 tends to move downward by the urging force of the spring 7. At this time, the backup pin 2 that is in contact with the lower surface of the substrate 20 is prevented from moving downward and maintained at the upper end position because the stopper 8 enters the groove 2c. On the other hand, the backup pin 2 in contact with the electronic component 21 is not prevented from moving downward because the stopper 8 does not enter the groove 2c, and the protrusion 2b is connected to the air supply path 4 as shown in FIG. It descends to the lower end position (origin position) that contacts the bottom surface.
[0028]
In this state, the substrate 20 is backed up by a plurality of backup pins 2, 2,. Then, electronic components are mounted on the upper surface of the substrate 20 by a chip mounter (not shown).
[0029]
When the type of the substrate changes, processing for returning the backup pins 2, 2,... Held at the upper end position by the stopper 8 to the lower end position is performed. That is, air is supplied from the pneumatic pressure source 12 to the cylinders 11 connected to the sliding bodies 10. Thereby, the rod 11a of each cylinder 11 moves forward against the urging force of the spring 11b, and each sliding body 10 slides in the left direction of FIG.
[0030]
Thereby, each stopper 8 attached on each sliding body 10 also moves together with the sliding body 10 and rotates in a biasing direction by the spring 14 around the stepped screw 13. Further, when the sliding body 10 slides in the left direction, as shown in FIG. 8, one side edge of each stopper 8 abuts on a corner of the recess 10a, and the rotation of the stopper 8 stops. The stopper 8 is still engaged with the groove 2c of the backup pin 2.
[0031]
When the sliding body 10 further slides leftward, as shown in FIG. 9, the stopper 8 engaged with the groove 2c is detached from the groove 2c, so that the backup held at the upper end position by the stopper 8 is performed. The pin 2 is moved to the lower end position by the urging force of the spring 7 and returns to the initial state shown in FIG. When the next substrate is supplied to the predetermined position, the substrate backup mechanism is set to a state corresponding to the new substrate in the above-described procedure.
[0032]
In this board backup mechanism, the backup pin automatically avoids the already mounted electronic parts and performs backup, so the operator can check the position of the electronic parts attached to the board and decide the backup location, There is no need to teach this to the substrate backup mechanism, to detect the position of the electronic component by the sensor, or to read the barcode attached to the substrate. Therefore, the labor of the operator is reduced, the setup time when switching the substrate model is shortened, and the production efficiency is greatly improved. Further, if mounting is performed in a state where the backup pin is in contact with the electronic component, the electronic component may be damaged, but there is no such fear.
[0033]
Further, this board backup mechanism does not require a sensor for detecting mounted electronic components, a complicated control system for controlling each backup pin based on information from the sensor, and uses only one valve. Therefore, it can be manufactured inexpensively with a very simple structure.
[0034]
Furthermore, in this board backup mechanism, the mechanism that releases the stopper that locks the backup pin can simultaneously release a plurality of stoppers by sliding one sliding body, and the number of parts is small. Since the structure is simple, the manufacturing cost is low.
[0035]
In addition, this invention is not limited to embodiment mentioned above, A various deformation | transformation can be added to embodiment mentioned above in the range which does not deviate from the summary of this invention.
[0036]
【The invention's effect】
As described above, according to the present invention, when backing up a board, the backup pin automatically avoids the already mounted electronic parts to perform backup, so that the operator can position the electronic parts attached to the board. There is no need to determine the backup location by checking the above, to teach this to the backup mechanism, to detect the position of the electronic component by the sensor, or to read the barcode attached to the substrate. Therefore, the labor of the operator is reduced, the setup time at the time of switching the substrate model is shortened, and the production efficiency is greatly improved. Further, since mounting is not performed in a state where the backup pin is in contact with the electronic component, it is possible to prevent the component from being damaged. Furthermore, the substrate-backup mechanism of the present invention, the sensor and to detect the already mounted electronic components, without requiring a complicated control system for controlling each backup pin based on the information from the sensor, further engaging the backup pins The mechanism that releases the stopped stopper can release a plurality of stoppers at the same time by sliding one sliding body, and since it has a very simple structure, it can be manufactured at low cost. The labor and time required for maintenance can be reduced.
[0037]
Further, in the substrate backup mechanism according to claim 4, the mechanism that releases the stopper that locks the backup pin can simultaneously release a plurality of stoppers by sliding one sliding body, Since it has a simple structure with a small number of parts, the manufacturing cost is low.
[Brief description of the drawings]
FIG. 1 is a plan view of a substrate backup mechanism according to an embodiment of the present invention.
2 is a cross-sectional view taken along line XX in FIG.
3 is a cross-sectional view taken along line YY in FIG.
4 is a sectional view taken along line ZZ in FIG.
FIG. 5 is an explanatory diagram of the operation of the substrate backup mechanism of FIG. 1;
6 is an explanatory diagram of the operation of the substrate backup mechanism of FIG. 1. FIG.
7 is an explanatory view of the operation of the substrate backup mechanism of FIG.
FIG. 8 is an explanatory diagram of the operation of the substrate backup mechanism of FIG.
FIG. 9 is an explanatory view of the operation of the substrate backup mechanism of FIG.
FIG. 10 is a schematic configuration diagram of a conventional substrate backup mechanism.
FIG. 11 is a schematic configuration diagram of a conventional substrate backup mechanism.
[Explanation of symbols]
2 Backup pin 6 Air pressure source (Mechanism for applying drag)
7 Coil spring (biasing means)
8 Stopper (Locking means)
20 Substrate 21 Electronic component

Claims (1)

Backing up the lower surface of the substrate on which the electronic component is mounted, positioned at a predetermined position, at a place where the electronic component does not exist, and protrudes upward from the upper surface of the base and the base A plurality of backup pins attached so as to be movable in the vertical direction, a resilient member for urging each backup pin downward and maintaining it at the lower end position, and Drag applying means for applying a drag force that rises against an urging force, and each backup pin are provided so as to be freely detachable, and when the backup pin protrudes to a position in contact with the lower surface of the substrate, the backup pin And a plurality of stoppers that are slidably engaged with linear grooves formed on the upper surface of the base so as to extend horizontally. Driving means for sliding the sliding body in both directions, and each stopper is pivotally attached to the upper surface of the sliding body via a vertical support shaft and biased toward the corresponding backup pin, The backup pin is formed to engage with a groove formed on the outer peripheral portion of the backup pin, and the sliding body is integrated with a plurality of backup pins locked by the stopper. The board backup mechanism of the electronic component mounting apparatus is characterized in that, when sliding in the direction, the stoppers engaged with the grooves are respectively released from the grooves and the locking of the plurality of backup pins is released. .

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