JP2013030704A - Substrate stop device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a substrate stop device capable of stopping a circuit board with sufficient positioning accuracy and suppressing increase in device cost.SOLUTION: A stopper plate 112 is provided on the downstream side end of an in-conveyor 52 such that it can be lifted and lowered, it is lifted and lowered by a lifting device while being guided by a guiding device 122, and the upper end of the stopper plate 112 is received by a pair of stopper plate receiving devices 116. The stopper plate receiving device 116 includes a guide face 140 which is inclined so that it becomes more inclined to the upstream side of a conveying direction as it is closer to the upper position, and a guide face 142 which is inclined so that it becomes more inclined to the downstream side as it is closer to the upper position and which has an inclination angle larger than that of the guide face 140. The guide face 140 guides the upper end of the stopper plate 112 to the upstream side of the conveying direction according to lifting of the stopper plate 112, and the guide faces 140, 142 engage with the upper end corner part of the stopper plate 112 to regulate an elevation end position. The guiding device 122 and the stopper plate receiving devices 116 support both upper and lower ens parts of the stopper plate 112, deflection of the stopper plate 112 to the downstream side of the conveying direction when abutting with a circuit board is reduced, and the stop position accuracy of a circuit board 74 is improved.

Description

  The present invention relates to a substrate stopping device, and more particularly to a substrate stopping device for stopping a circuit board conveyed by a belt conveyor.

  The following Patent Document 1 describes a substrate stopping device provided with a stopper plate that contacts and stops a circuit board conveyed by a belt conveyor. The stopper plate is moved by the driving unit to a position protruding from the conveyance surface of the circuit board and abutting the circuit board and a position retracted from the conveyance surface.

Japanese Patent Laid-Open No. 8-307099

However, the substrate stopping device described in Patent Document 1 still has room for improvement. For example, when the circuit board is heavy or when the conveyance speed is high, the stopper plate is bent due to an impact when the circuit board comes into contact, and the stop position is displaced. In some cases, the stopper plate may be bent and damaged. If the stopper plate is thick, it is possible to prevent bending and damage. However, it is necessary to make the stopper plate considerably thick, and there is room for improvement in that the device cost increases. Alternatively, even if the stopper plate is not bent to a problem, if there is a gap in the guide device that guides the raising and lowering of the stopper plate, the stopper plate is inclined due to the gap. This increases the error of the stop position of the circuit board, and there is room for improvement.
The present invention has been made against the background of the above circumstances, and an object of the present invention is to provide a substrate stopping device that can stop a circuit board with high positioning accuracy and can suppress an increase in apparatus cost.

  The above-mentioned problem is that a substrate stopping device that is supported by the support surface of the belt conveyor and stops in contact with the circuit board that is conveyed in the conveying direction is (a) a stopper plate that is parallel to the width direction perpendicular to the conveying direction. (B) While holding the lower end portion of the stopper plate and raising and lowering in the elevating direction perpendicular to the transport direction and the width direction, the upper end of the stopper plate is the support surface of the belt conveyor. An elevating device that moves up and down to a retracted position located below and an action position located above the support surface; and (c) provided above the support surface of the belt conveyor and raised to the action position. And a stopper plate receiving device that engages with the upper end portion of the stopper plate to prevent the upper end portion from moving at least downstream in the transport direction. It is determined.

  When the stopper plate is raised from the retracted position to the operating position, the upper end portion thereof is received by the stopper plate receiving device and is prevented from moving at least downstream in the transport direction. As a result, the stopper plate is held at the lower end portion by the lifting device, the upper end portion is received by the stopper plate receiving device, and is held at both ends in the vertical direction, compared with the case where only the lower end portion is held. Thus, the bending of the upper end portion toward the downstream side in the conveying direction when the circuit board comes into contact is small. Therefore, the stop position accuracy of the circuit board is improved, and damage to the stopper plate is avoided. Furthermore, it is not indispensable to make the stopper plate thick so as to reduce bending and prevent damage, or to make the guide device without a gap, so that cost and weight can be reduced. Furthermore, it is possible to increase the conveyance speed of the circuit board by the substrate conveyance device and improve the conveyance efficiency.

Aspects of the Invention

  In the following, the invention which is recognized as being claimable in the present application (hereinafter, referred to as “claimable invention”. The claimable invention is a subordinate concept invention of the present invention which is the invention described in the claims) And may include inventions of a superordinate concept of the present invention or other concepts). As with the claims, each aspect is divided into sections, each section is numbered, and is described in a form that cites the numbers of other sections as necessary. This is for the purpose of facilitating the understanding of the claimable invention, and is not intended to limit the combinations of the constituent elements constituting the claimable invention to those described in the following sections. In other words, the claimable invention should be construed in consideration of the description accompanying each section, the description of the embodiment, the prior art, the common general technical knowledge, and the like. An aspect in which a constituent element is added and an aspect in which the constituent element is deleted from the aspect of each section can be an aspect of the claimable invention.

  In each of the following items, (1) corresponds to claim 1, (5) corresponds to claim 2, (8) corresponds to claim 3, (9) corresponds to claim 4, A combination of one of the items (15) and (16) and the item (17) corresponds to claim 5 respectively.

(1) A substrate stopping device that is supported by a support surface of a belt conveyor and stops in contact with a circuit board that is conveyed in a conveyance direction,
A stopper plate parallel to the width direction perpendicular to the conveying direction;
While holding the lower end portion of the stopper plate and raising and lowering in the raising and lowering direction perpendicular to the transport direction and the width direction, the upper end of the stopper plate is positioned below the support surface of the belt conveyor. An elevating device that elevates and lowers to a retracted position and an action position located above the support surface;
By engaging with the upper end of the stopper plate provided above the support surface of the belt conveyor and raised to the operating position, the upper end is prevented from moving at least downstream in the transport direction. A board stop device comprising: a stopper plate receiving device.
Note that the substrate stopping device may be provided at any location, such as the downstream end in the conveying direction of the belt conveyor, or the upstream side from the downstream end.
(2) The lifting device is
A holding member for holding the lower end of the stopper plate;
A guide device for guiding the raising and lowering of the holding member;
The substrate stopping apparatus according to item (1), further comprising an actuator that raises and lowers the holding member.
For example, a longitudinal member extending in the width direction and fixed to the lower end of the stopper plate can be used as a holding member, and a guide device or an actuator can be attached to the longitudinal member. Thus, it is also possible to attach a guide device or an actuator directly to the lower end of the stopper plate. In the latter case, the lower end portion of the stopper plate constitutes a holding member integral with the stopper plate. As the actuator, for example, a fluid pressure cylinder, which is a kind of fluid pressure actuator, an electric motor, or the like can be used.
(3) A guide surface that guides the upper end of the stopper plate, which is inclined toward the upstream side in the transport direction, and is raised to the working position toward the upstream side in the transport direction, with the stopper plate receiving device being inclined toward the upstream side in the transport direction. The substrate stopping device according to (1) or (2).
When the stopper plate receiving device has the structure described in the item (5) described later, a function of preventing the movement of the upper end of the stopper plate on both the upstream side and the downstream side in the transport direction (that is, a transport direction positioning function); Both the function of defining the rising end position as the operation position (that is, the actuator operating end position defining function) are performed by the stopper plate receiving device, and the manufacturing cost can be reduced by simplifying the configuration.
But not essential. One example is the stopper plate receiving device having the structure described in this section. At that time, the operating position of the stopper plate is defined by the operating end position defining function of the actuator, and at the moment or just before the stopper plate reaches the operating position, the upper end of the stopper plate contacts the guide surface, It is possible to prevent the downstream movement. In this aspect, the inclination angle of the guide surface with respect to the raising / lowering direction of the stopper plate is relatively small at least in the vicinity of the action position so that the change in the position of the guide surface in the conveyance direction with respect to the change in the action position can be small. It is desirable that For example, it is preferably 10 ° or less, and more preferably 5 ° or less and 3 ° or less.
In addition to the inclined guide surface which is the guide surface described in this section, the stopper plate receiving device may be provided with a parallel guide surface parallel to the ascending / descending direction of the stopper plate. In this aspect, in the process of moving the stopper plate to the operating position, the upper end of the stopper plate comes into contact with the inclined guide surface, and then rises while being moved slightly upstream in the transport direction by the guide operation of the inclined guide surface, Subsequently, it is desirable to reach the operating position while being guided by the parallel guide surfaces. Note that the movement of the stopper plate rising while being slightly moved upstream in the conveying direction by the guide action of the inclined guide surface is caused by the presence of the clearance of the holding member when the guide device has a minute clearance. It is desirable to allow the tilt and the elastic deformation of the stopper plate. The guide device may be a ball guide having no clearance, and in this case, the above movement may be permitted by elastic deformation of the stopper plate.
In any of the above cases, the movement of the stopper plate upper end to the downstream side in the conveyance direction is prevented, so that the movement of the stopper plate to the downstream side is suppressed only by the guide function of the guide device, When the circuit board conveyed to the belt conveyor comes into contact with the stopper plate, the amount of movement of the stopper plate to the downstream side is small, and an effect of improving the stop position accuracy of the circuit board is obtained. In particular, the stopper plate can be brought into contact with the circuit board in a state where the upper end portion of the stopper plate is in contact with the guide surface and is prevented from moving to the downstream side in the transport direction, so that the circuit board can be stopped with high positional accuracy. it can. It is possible to provide the stopper plate receiving device with a receiving surface parallel to the ascending / descending direction and to receive the upper end of the stopper plate by the receiving surface. However, as in that case, the stopper plate and the receiving surface In the meantime, there is no bending of the gap between the stopper plate so that the stopper plate is positioned on the upstream side in the transport direction with respect to the receiving surface, and the stop position accuracy of the circuit board is good.
Further, the stopper plate receiving device is provided with a contact surface parallel to the circuit board transport direction, and a frictional force between the contact surface and the upper end of the stopper plate (to increase this frictional force, the contact surface). And at least one of the upper end of the stopper plate is preferably formed of a material having a higher coefficient of friction than the other portions of the stopper plate receiving device and the stopper plate) to prevent movement of the stopper plate in the transport direction. Although it is also possible, compared with the case, the movement of the stopper plate to the downstream side in the transport direction can be more reliably prevented.
(4) In addition to the guide surface as the first guide surface, the stopper plate receiving device is inclined in a direction toward the downstream side in the transport direction in the upper part and is raised to the working position. The substrate stopping apparatus according to item (3), further comprising a second guide surface that guides the substrate to the downstream side in the transport direction.
With regard to the stopper plate receiving device described in this section, the description regarding the above item (3) is almost the same except that the guiding function of the second guiding surface is obtained in addition to the guiding function of the first guiding surface.
Even if the position of the upper end portion of the stopper plate in the transport direction of the circuit board is shifted from the preset position to the upstream side in the transport direction, it is guided by the second guide surface and moved to the set position side. For this reason, the gap between the upper end portion of the stopper plate and the first guide surface is reduced or eliminated, and the positioning accuracy of the circuit board is improved.
(5) The minimum distance in the transport direction between the first guide surface and the second guide surface of the stopper plate receiving device is smaller than the thickness of the stopper plate, and the first guide surface and the second guide surface The substrate stopping device according to the item (4), which functions as a rising end position defining member that defines a rising limit of the stopper plate by engaging both corners of the upper end of the stopper plate.
In the stopper plate receiving apparatus having the structure described in this section, generally, the inclination angle of the first guide surface and the second guide surface with respect to the raising / lowering direction of the stopper plate is the stopper plate described in the above items (3) and (4). It is desirable to make it larger than the inclination angle of the guide surface of the receiving device, and it is desirable that the angle formed by the first guide surface and the second guide surface be 30 ° or more, 60 ° or more, or 90 ° or more. . In addition, from the viewpoint of the positioning function regarding the conveyance direction of the first guide surface and the second guide surface, it is desirable that the inclination angle is small. From the viewpoint of the function as the rising end position defining member, or the stopper plate and the stopper plate receiving device. It is desirable that the angle of inclination is large from the viewpoint of reducing the wear of the parts that engage with each other. Is to be done.
(6) The substrate stopping apparatus according to (5), wherein an inclination angle of the first guide surface with respect to the raising / lowering direction of the stopper plate is smaller than an inclination angle of the second guide surface with respect to the raising / lowering direction of the stopper plate.
In the substrate stopping apparatus according to this aspect, the first guide surface mainly performs a positioning function regarding the conveyance direction of the stopper plate, and the second guide surface mainly functions to define the rising end position of the stopper plate.
For example, the inclination angle of the first guide surface is desirably 20 ° or less, and more desirably 15 ° or less, 10 ° or less, and 5 ° or less.
(7) The substrate stopping device according to any one of (1) to (6), wherein the stopper plate has a rectangular shape whose width, which is a dimension in the width direction, is larger than a height, which is a dimension in the elevation direction.
The circuit board can be brought into wide contact with the stopper plate in the width direction, and the circuit board can be stably stopped without being tilted around an axis perpendicular to the surface thereof.
(8) The belt conveyor includes a pair of conveyor belts that respectively support both side edges in the width direction of the circuit board to be transported, and the stopper plates are opposite to each other in the width direction of the pair of conveyor belts. The substrate stopping device according to any one of (1) to (7), wherein the substrate stopping device has a width wider than a distance between two side edges.
According to the stopper plate described in this section, the circuit board is provided with a notch that opens in the end surface on the downstream side in the transport direction, or is convexly curved downstream or upstream in the transport direction. Even if the downstream side edge does not form a straight line parallel to the width direction, all kinds of transportable types can be carried out without changing the position in the conveyance direction or width direction of the stopper plate according to the shape of the circuit board. The circuit board can be stopped without protruding downstream from the conveyor.
(9) The stopper plate receiving device according to any one of (1) to (8), wherein the pair of stopper plate receiving devices are provided at positions that can be engaged with each of two portions separated in the width direction of the stopper plate. Substrate stop device.
The features described in this section are particularly effective in the embodiments described in the sections (7) and (8).
Each of the pair of stopper plate receiving devices receives two portions of the stopper plate separated in the width direction of the circuit board, and can stably receive the stopper plate against an impact when the stopper plate contacts. Therefore, the movement of the stopper plate to the downstream side when the circuit board comes into contact is well prevented, and higher positioning accuracy can be obtained.
(10) The belt conveyor includes a pair of conveyor belts that respectively support both side edges in the width direction of the circuit board to be transported, and the stopper plates are opposite to each other in the width direction of the pair of conveyor belts. The substrate stop according to (9), wherein the substrate stop has a width wider than the interval between the two edges, and the pair of stopper plate receiving devices are arranged at an interval wider than the interval between the two edges. apparatus.
(11) The belt conveyor is
A pair of conveyor belts that respectively support both side edges in the width direction of the circuit board to be conveyed, and a pair of side frames that support each of the pair of conveyor belts, and the pair of stoppers The substrate stopping device according to (10), wherein the plate receiving device is fixed to an outer surface of the side frame in the width direction.
(12) The belt conveyor includes a frame interval changing device that changes an interval between the pair of side frames, and the stopper plate is in the state where the interval between the pair of side frames is maximized. The substrate stopping device according to (11), wherein the substrate stopping device has a width wider than a distance between two edges opposite to each other in the width direction of the conveyor belt.
In the substrate stopping device of this configuration, as the width of the belt conveyor is changed in accordance with the width of the circuit board to be transported, the distance between the pair of stopper plate receiving devices changes, and the circuit board of the stopper plate Will be engaged with the two parts corresponding to both side edges of the circuit board, and when the circuit board contacts the contact part of the stopper plate, the contact part is effectively prevented from being displaced downstream in the transport direction. As a result, the circuit board has a particularly high stop position accuracy.
(13) The substrate stopping device according to any one of (1) to (12), wherein a plurality of through holes are formed in a portion of the stopper plate that contacts the downstream end of the circuit board.
According to the board stopping device described in this section, the circuit board can be stopped by contacting the stopper plate, and the presence or absence of the circuit board can be visually checked through the through hole from the downstream side in the transport direction with respect to the stopper plate. Can be confirmed.
In this section, the number of through-holes and internal dimensions are any number of through-holes, regardless of the presence of any number and internal dimension notches that are expected to be formed at the front end of the circuit board. It is desirable to select a size through which the front end of the circuit board can be visually recognized.
The feature described in this section is particularly effective when the width of the stopper plate is equal to or larger than the width of the circuit board. In this case, the circuit board does not protrude from the stopper plate, and if the stopper plate is made of an opaque material, the circuit board is hidden behind the stopper plate and cannot be seen.
Although the rigidity of the stopper plate is reduced by providing the through hole, the stopper plate is received by the stopper plate receiving device, and movement to the downstream side in the transport direction when contacting the circuit board is reduced. Therefore, when the through hole is formed in the stopper plate, it is desirable that the stopper plate is received by the stopper plate receiving device, but this is not indispensable, and the feature described in this section is the feature described in (1). It can be adopted independently. The same applies to the substrate stopping device described in item (17).
(14) Furthermore,
A downstream end detection device disposed upstream of the stopper plate in the transport direction and detecting a downstream end of a circuit board transported by the belt conveyor and generating a detection signal;
And a drive energy shut-off device that cuts off drive energy to the drive source of the belt conveyor in response to the detection signal from the downstream end detection device. apparatus.
The “set distance” is, for example, a distance that is guaranteed to move to a position where the circuit board contacts the stopper plate by the movement of the conveyor belt due to inertia after the drive energy to the drive source is cut off.
(15) The downstream end detection device is
A light projector and a light receiver provided at a distance greater than the width of the circuit board in the width direction of the circuit board and facing each other in a direction parallel to the width direction;
An electric circuit that emits the detection signal when an output signal of the light receiver drops below a set value by blocking at least a part of light from the light projector to the light receiver by a downstream end of the circuit board; The board | substrate stop apparatus as described in (14) term containing.
In the aspect of the next paragraph, if there is a cutout at the downstream end of the circuit board, at least a part of the light passes through the cutout without being blocked by the circuit board, and the downstream end of the circuit board is not detected or detected. There is a possibility that a certainty of the certainty will be lowered. Alternatively, in order to avoid such a situation, it may be necessary to adjust the position of at least one of the projector and the light receiver, or to adjust the set value in the electric circuit. On the other hand, according to the substrate stopping device described in this section, since the optical axes of the projector and the light receiver are parallel to the width direction, the downstream side of the circuit board is independent of the shape of the downstream end of the circuit board. The light is blocked by the end, and the circuit board can be detected without adjusting the position or setting value of the detection device.
(16) The downstream end detection device is
A light projector and a light receiver provided at a distance larger than the width of the circuit board in the width direction of the circuit board and facing each other with the optical axis inclined with respect to the width direction;
An electric circuit that emits the detection signal when an output signal of the light receiver drops below a set value by blocking at least a part of light from the light projector to the light receiver by a downstream end of the circuit board; The board | substrate stop apparatus as described in (14) term containing.
The aspect of this section has the disadvantage described with respect to the section (15), but has an advantage that the downstream end of the circuit board can be detected even when the circuit board is warped.
(17) The substrate stopping device according to (15) or (16), wherein a large number of small-diameter through holes are formed in a portion of the stopper plate that contacts the downstream end of the circuit board.
In this section, “small-diameter through hole” means a through hole having a diameter of 5 mm or less, desirably 3 mm or less, and more desirably 2 mm or less. In addition, “a large number of through holes” means that the sum of the cross-sectional areas of the through holes is 30% or more, preferably 40% or more, more preferably 50% or more of the total area in the portion that contacts the downstream end of the circuit board. Means the resulting number. As the number of through-holes having a smaller diameter is formed, the reflectance of the surface of the stopper plate can be reduced uniformly.
In this section, “the portion of the stopper plate that contacts the downstream end of the circuit board” is not only the portion that actually contacts the circuit board, but also the height of the light from the projector to the light receiver in the elevation direction of the stopper plate It means a wider band-like area.
Due to the features described in this section, the light emitted from the projector toward the light receiver is reflected by the surface of the stopper plate and the amount reaching the light receiver is reduced, and the light from the projector to the light receiver and the downstream of the circuit board The rate of change in the amount of light received by the receiver relative to the change in the relative position with the side edge increases, clearly showing that the output signal of the receiver has dropped below the set value, and the downstream end of the circuit board where the detection signal is emitted An effect of reducing the variation in position can be obtained.
The feature described in this section is that the stopper plate has a glossy surface (for example, the surface roughness should be 0.4 mm or less, preferably 0.1 mm or less, and optimally 0.05 mm or less). It is particularly effective when the surface color is made of a material that satisfies at least one of the light color.
The large number of small-diameter through holes described in this section can also serve as the plurality of through-holes described in (13).
In a mode in which this item is subordinate to item (16), the small-diameter through hole is an optical axis inclined with respect to the width direction of the downstream end detection device in a state where the stopper plate is raised to the operating position. It is desirable that the portion be formed in a region having a width wider than the width in the direction perpendicular to the optical axis of the light emitted from the projector. However, it is not always necessary to provide the small diameter through hole in a region inclined with respect to the width direction perpendicular to the transport direction.
(18) At least one of darkening the portion of the stopper plate that contacts the downstream end of the circuit board and making the surface non-glossy by applying a matting agent or the like was performed (15) The substrate stopping apparatus according to any one of items 1 to (17).
According to the substrate stopping apparatus according to the aspect dependent on (17), the effect of the substrate stopping apparatus described in (17) is further increased, and the substrate according to the aspect dependent on (15) or (16) According to the stop device, a similar effect can be obtained instead of the effect of the substrate stop device described in the item (17).

It is a perspective view which shows the electronic circuit assembly line containing the screen printer provided with the board | substrate stop apparatus which is one Embodiment of claimable invention. It is a top view which shows the said screen printer with a shuttle conveyor. It is a side view which shows the said screen printer. It is a top view which shows roughly the in-conveyor of the board | substrate conveyance support apparatus of the said screen printer. FIG. 5A is a side view showing the in-conveyor, FIG. 5A is a view showing a state where the stopper plate is located at the retracted position, and FIG. 5B is a view showing a state where the stopper plate is located at the operating position. is there. FIG. 6A is a front view showing the downstream end of the movable side frame of the in-conveyor, FIG. 6A is a view showing a state where the stopper plate is located at the retracted position, and FIG. It is a figure which shows the state located in a position.

  Embodiments of the claimable invention will be described in detail below with reference to the drawings. In addition to the following embodiments, the claimable invention can be implemented in various modifications based on the knowledge of those skilled in the art, including the aspects described in the above [Aspect of the Invention] section. .

  FIG. 1 illustrates an electronic circuit assembly line including a screen printer equipped with a substrate stopping device according to an embodiment of the claimable invention. This electronic circuit assembly line has one or more units, in this embodiment, a plurality of units, for example, two screen printers 10 (hereinafter abbreviated as “printer 10”), one or more units, and two units in this embodiment. There are provided one shuttle conveyor 12 and one or more, in this embodiment, a plurality of, for example, four electronic circuit component mounting machines 14 (hereinafter referred to as mounting machines 14). The printing machine 10 and the mounting machine 14 are a kind of board-to-board work machines that perform work on circuit boards, and the electronic circuit assembly line is a kind of board-to-board work lines.

  The two printing machines 10 are adjacent to the upstream side in the circuit board transport direction in the electronic circuit assembly line with respect to the four mounting machines 14, and are arranged side by side in parallel to the transport direction. One of the shuttle conveyors 12 is provided between the two printing machines 10, and the other is downstream of the downstream printing machine 10, which is the most downstream printing machine 10, and adjacent to the printing machine 10. It is provided between the mounting machine 14 to be used. In the present embodiment, the left-right direction is the circuit board transport direction, and the direction orthogonal to the transport direction is the front-rear direction. In the present embodiment, the left-right direction and the front-rear direction are both horizontal.

The two printing presses 10 and the shuttle conveyor 12 are configured in the same manner, and the upstream printing press 10 and the shuttle conveyor 12 will be described as a representative.
As shown in FIGS. 2 and 3, the printing machine 10 includes a printing machine body 20, which is a work machine body, a substrate transportation support device 22, a passing substrate transportation device 24, a mask holding device 26, a printing device 28, and a control device 30 (see FIG. 2). 1). The mask holding device 26 is provided above the main conveyor (to be described later) of the substrate transport support device 22 of the printing press main body 20 and holds the mask 34 placed on the mask support base 32 in a horizontal posture. The printing device 28 includes a pair of squeegees 42, a squeegee moving device 44 that moves the squeegees 42 in the front-rear direction along the mask 34, and a squeegee lifting device that lifts and lowers the pair of squeegees 42. 46 and provided above the mask holding device 26 of the printing machine main body 20.

  As shown in FIG. 2, the substrate conveyance support device 22 is provided in the front part of the printing press main body 20, and the passage substrate conveyance device 24 is provided in the rear part. The substrate transport support device 22 includes a main conveyor 50, an in-conveyor 52 disposed on the upstream side of the main conveyor 50 in the transport direction, and an out-conveyor 54 disposed on the downstream side. The mask holding device 26 and the printing device 28 are provided above the main conveyor 50.

  The main conveyor 50 includes a conveyor device 60 and a substrate support device 62. In this embodiment, the conveyor device 60 is constituted by a belt conveyor, and includes a pair of conveyor belts 64 and a belt rotation device 66 that rotates the conveyor belts 64. Each of the pair of conveyor belts 64 is supported by the side frame 68 so as to be able to circulate, and is circulated synchronously by a belt circulator 66 using a circulator motor 70 as a drive source. 3), the both side edges in the width direction of the circuit board 74 to be transported are respectively supported from below, and the circuit board 74 is transported in such a posture that the printed surface as its work surface is horizontal. In the substrate transport support device 22, the direction perpendicular to the transport direction and parallel to the front-rear direction of the printing press 10 is the width direction and is horizontal. In the present embodiment, as shown in FIG. 2, the circuit board 74 is transported in a posture in which the longitudinal direction is parallel to the width direction of the substrate transport support device 22. In the present embodiment, the longitudinal direction of the circuit board 74 is the width direction, and the dimension in the width direction is the width. The width direction of the circuit board 74 is a direction perpendicular to the transport direction, and is the width direction of the substrate transport support device 22.

  One of the pair of side frames 68 (the lower side frame 68 in FIG. 2) is a fixed side frame 68 provided with a fixed position, and the other can be moved toward and away from the fixed side frame 68. The movable side frame 68 is provided and is moved by the frame interval changing device 78. As shown in FIG. 2, the frame interval changing device 78 includes an interval changing motor 80 as a driving source, a belt 82 to which a movable side frame 68 is connected, a fixed side frame 68 and a main body 83 of the main conveyor 50. And a pulley 84 around which a belt 82 is wound. The belt 82 and the pulley 84 are a timing belt and a timing pulley, respectively. The belt 82 is moved by rotating one of the plurality of pulleys 84 by the interval changing motor 80, and the movable side frame 68 is moved while being guided by a guide device (not shown). Thereby, the distance between the pair of side frames 68 and the distance between the pair of conveyor belts 64 are automatically changed in accordance with the width of the circuit board 74 to be conveyed.

  In the present embodiment, the board support device 62 includes a plurality of support pins 90, a pin support base 92, and a support base elevating device 94 as support members, and supports the circuit board 74 from below, as schematically shown in FIG. . In the present embodiment, the substrate support device 62 constitutes a substrate clamping device in cooperation with the conveyor device 60, and the main conveyor 50 is lifted and lowered by a lifting device (not shown), whereby the circuit board 74 is masked 34. It is made to contact-separate with the lower surface of. Further, although not shown, the main conveyor 50 is provided with a substrate stopping device. The substrate stopping device includes a stopper member and a stopper member moving device that moves the stopper member to an arbitrary position in the horizontal plane. The stopper member is positioned at a predetermined position and contacts the downstream end of the circuit board 74. Touch and stop moving.

  As shown in FIG. 2, the in-conveyor 52 includes a conveyor device 100 and a frame interval changing device 102 configured in the same manner as the conveyor device 60 and the frame interval changing device 78 of the main conveyor 50, and performs the same function. Constituent elements are denoted by the same reference numerals to indicate a corresponding relationship, and description thereof is omitted. The conveyance of the circuit board 74 in the in-conveyor 52 is stopped by the board stop device 110. As shown in FIGS. 4 and 5, the substrate stopping device 110 includes a stopper plate 112, an elevating device 114, and a stopper plate receiving device 116, and is provided at the downstream end in the conveying direction of the in-conveyor 52. .

  In this embodiment, the stopper plate 112 has a rectangular plate shape, the longitudinal direction thereof is parallel to the width direction of the substrate transport support device 22, the plate surface or the stopper surface is perpendicular to the transport direction, and And is attached to the main body 118 of the in-conveyor 52 so as to be movable up and down. The stopper plate 112 has a longitudinal direction that is the width direction, and two widths that are dimensions in the width direction are opposite to each other in the width direction of the pair of side frames 68 in a state where the distance is the maximum. It is wider than the interval between the edges and is larger than the height which is the dimension in the ascending / descending direction perpendicular to the conveying direction and the width direction. The width of the stopper plate 112 is such that printing of a printing material, in the present embodiment, cream-like solder (hereinafter abbreviated as solder) is scheduled, and each of the plurality of types of circuit boards 74 that can be transported by the substrate transport support device 22. The width of the pair of side frames 68 is wider than the maximum width of the widths, and is wider than the distance between two edges opposite to each other in the width direction of the pair of conveyor belts 64 in a state where the pair of side frames 68 is in the maximum state. -ing Further, in this embodiment, the stopper plate 112 has a thickness of 1.6 mm, is made of SPCC (cold rolled steel plate) and is opaque, and the surface is subjected to a radiant treatment (registered trademark) for protection. A rust film is formed, blackened, and glossy.

  The raising and lowering of the stopper plate 112 is guided by the guide device 122. As shown in FIGS. 4 and 5, the guide device 122 is a guide rod as a pair of guided members fixed to the both ends of the stopper plate 112 in the width direction by a fixing member 123 so as to extend in the vertical direction. 124 and a fixed side frame 68 fixed to the main body 118 and a support member 128 attached to the support portion 125 of the main body 118, and a guide rod 124 is fitted as a pair of guide members that can be moved up and down. The guide block 126 is included. The support portion 125 is a portion on the outside of the movable side frame 68 of the main body 118, that is, a portion opposite to the fixed side frame 68 side, and is provided at a position that allows the movement of the movable side frame 68. In FIG. 4, the support member 128 is not shown. In the present embodiment, the guide rod 124 is fixed to the stopper plate 112 by a fixing member 123 via a bush 129, as shown in FIG. In the present embodiment, the bush 129 has a cylindrical shape and is made of honeynite (registered trademark). Honeynite is a vibration-damping rubber excellent in shock and vibration absorption.

  As shown in FIG. 4, the stopper plate 112 is provided at a position downstream of the pair of side frames 68 in the conveying direction, and as shown in FIG. 5, one end portion in the width direction thereof is the fixed side frame 68. It protrudes to the outer side (opposite side to the movable side frame 68), and the other end extends beyond the movable side frame 68 to the opposite side to the fixed side frame 68 to the support portion 125. Therefore, the stopper plate 112 does not hinder the movement of the movable side frame 68 and is projected outside the movable side frame 68 even if the distance between the pair of side frames 68 is maximized. The movement can be stopped by contacting the entire downstream end. Further, the plate-like stopper plate 112 is thin and requires a small installation space in the conveying direction. Even if it is provided at the downstream end of the in-conveyor 52, it does not protrude to the main conveyor 50 side. The substrate stopping device 110 can be provided without increasing the dimension in the direction parallel to the transport direction.

  As shown in FIG. 5, the lifting device 114 includes an air cylinder 130. The air cylinder is a fluid pressure cylinder as a fluid pressure actuator which is a kind of drive source. The air cylinder 130 is provided on the support member 128 so as to be located on the upstream side of the stopper plate 112 in the conveying direction as shown in FIG. 4, and is protruded upward from the cylinder housing 132. A stopper plate 112 is fixed to the upper end of the piston rod 134. The upper end portion of the piston rod 134 is connected to an ear portion 136 formed by bending a part of the lower end portion of the stopper plate 112 at a right angle at the central portion in the longitudinal direction of the lower end portion of the stopper plate 112. In the present embodiment, the lower end portion of the stopper plate 112 including the ear portion 136 and the portion where the upper end portion of the guide rod 124 is fixed via the fixing member 123 is a holding member integral with the stopper plate 112. It constitutes.

  The piston rod 134 is moved up and down by its expansion and contraction, and the stopper plate 112 is positioned such that the upper end of the stopper plate 112 is below the support surface 72 of the belt conveyor 64 as shown in FIG. As shown in FIG. 5B, the upper end of the stopper plate 112 is positioned above the support surface 72, and the circuit board 74 is the upper end portion of the stopper plate 112. It abuts on the part below the upper end, and moves up and down to the working position to stop the movement.

  In the present embodiment, as shown in FIGS. 4 and 5, the stopper plate receiving device 116 is provided on a pair of side frames 68 to form a pair. The main body 138 of the stopper plate receiving device 116 has a rectangular parallelepiped block shape as shown in FIG. 6, and is fixed to the outer side surface in the width direction of each of the pair of side frames 68. The belt 64 is disposed at a wider interval than the interval between two edges opposite to each other in the width direction of the belt 64, and can be engaged with each of two portions of the stopper plate 112 separated in the width direction. Each main body 138 of the pair of stopper plate receiving devices 116 is located above the support surface 72 of the conveyor belt 64 and is located at a position where the upper limit of the stopper plate 112 is defined as the operation position, and is conveyed from the side frame 68. It protrudes downstream in the direction, and its protruding end is provided at a position above the stopper plate 112. The stopper plate 112 has a width that can be received by the stopper plate receiving device 116 fixed to each outer surface of the side frames 68 when the distance between the pair of side frames 68 is maximized.

  As shown in FIG. 6A, a groove 139 is formed in the protruding end of the main body 138 so as to open in the lower surface and penetrate in the width direction. The groove 139 has a V shape, and the groove side surface on the downstream side in the conveyance direction among the pair of groove side surfaces is a guide surface 140 that is inclined toward the upstream side in the conveyance direction toward the top. The groove side surface on the upstream side in the transport direction is a guide surface 142 that is inclined in a direction toward the downstream side in the transport direction toward the top. In the present embodiment, the angle formed by the guide surfaces 140 and 142 is 55 degrees, and the inclination angle of the guide surface 140 with respect to the elevation direction of the stopper plate 112 is the inclination angle of the guide surface 142 with respect to the elevation direction of the stopper plate 112. The angle of inclination of the guide surfaces 140 and 142 is 15 degrees and 40 degrees. Further, the minimum interval in the conveying direction of the guide surfaces 140 and 142 is made smaller than the thickness of the stopper plate 112. In the illustrated example, it is 0.

  Further, as shown in FIGS. 4 and 5, the in-conveyor 52 is provided with a downstream end detection device 150 that detects the downstream end of the circuit board 74 conveyed by the conveyor device 60 and generates a detection signal. Yes. In the present embodiment, the downstream end detection device 150 is configured by a transmissive photoelectric sensor that is a kind of a non-contact sensor, and includes a projector 152, a light receiver 154, and an electric circuit 156 (see FIG. 1). Including. One of the projector 152 and the light receiver 154, in this embodiment, the projector 152 is attached outside the fixed side frame 68 and outside the fixed stopper plate receiving device 116 on the outer surface of the fixed side frame 68, In this embodiment, a light receiver 154 is attached to the outside of the support portion 125 of the main body 118. The light projector 152 and the light receiver 154 face each other with a distance larger than the maximum width among the widths of the plurality of types of circuit boards that can be transported by the substrate transport support device 22 and are fixed in position. Therefore, the downstream end of all types of circuit boards 74 conveyed by the in-conveyor 52 is detected.

  In the present embodiment, the light projector 152 and the light receiver 154 are provided to face each other in a direction parallel to the width direction of the circuit board 74, and the light projector 152 radiates visible light horizontally, and the circuit board 74 has a width from right next to the circuit board 74. It is designed to shine light parallel to the direction. The light projector 152 includes a light projecting unit (not shown), the light receiver 154 includes a light receiving unit 158 (see FIG. 6), and the light projector 152 and the light receiver 154 are high as shown in FIG. In the vertical direction, the light emitted from the projector 152 intersects the conveyance path of the circuit board 74 at a right angle, and in the conveyance direction, the circuit board 74 contacts the stopper plate 112 on the upstream side of the stopper plate 112. Immediately before, the light receiving unit 158 is provided at a position where a part of the light received by the light receiving unit 158 is blocked by the downstream end of the circuit board 74.

  The light receiver 154 outputs a signal indicating the amount of received light to the electric circuit 156. When the output signal of the light receiver 154 drops below a set value, the electric circuit 156 outputs the detection signal at the downstream end of the circuit board 74. Output to the control device 30. In the present embodiment, the set value is detected before the downstream end of the thinnest circuit board 74 is brought into contact with the stopper plate 112, and the current supply (drive energy) to the motor 70 for rotation is cut off. Is set to a value. The set value may be set according to the thickness of the circuit board 74. However, in the present embodiment, since there is no need for that, the set value is constant regardless of the thickness of the circuit board 74.

  As shown in FIG. 5, a plurality of small-diameter through-holes 160 are formed in the band-shaped portion centering on the portion where the downstream end of the circuit board 74 abuts at the operation position of the stopper plate 112 by punch press processing. 112 is formed through the thickness direction. These small-diameter through holes 160 have a diameter of 2.5 mm in the present embodiment, and are spaced apart from each other in the width direction and the height direction of the stopper plate 112 (at an equal pitch in the present embodiment). The stopper plate 112 is formed in a zigzag shape over the entire width direction. The small-diameter through-hole 160 is radiated from the projector 152 around the same height as the optical axis of the downstream end detection device 150 in the height direction when the stopper plate 112 is raised to the operating position. It is formed in a region having a height that is slightly wider than the height in the vertical direction of the visible light beam (the direction parallel to the elevation direction of the stopper plate 112).

  As will be described later, the small-diameter through-hole 160 reduces the amount of light reflected by the stopper plate 112 at the diffusion portion of the light emitted from the projector 152 of the downstream side end detection device 150 and is used for visual inspection of the circuit board 74. Therefore, in this embodiment, the number and the cross-sectional area of the small-diameter through-holes 160 (area in a cross section orthogonal to the center line of the small-diameter through-hole 160) are the sum of the cross-sectional areas of the small-diameter through-holes 160. It is selected to be 40% of the total area.

  The out conveyor 54 is configured in the same manner as the in conveyor 52. In this printing machine 10, the dimensions in the conveyance direction of the in-conveyor 52 and the out-conveyor 54 are shorter than the maximum dimension among the dimensions in the conveyance direction of all types of circuit boards on which solder printing is scheduled. . Therefore, depending on the type of the circuit board, when the movement is stopped by the board stopping device 110, the upstream end in the transport direction is the conveyor 52 as in the circuit board 74 shown by a two-dot chain line in FIG. , 54 may protrude upstream. Depending on the amount of protrusion, the apparatus disposed upstream of the conveyors 52 and 54, in this embodiment, the shuttle conveyor 12 for the in-conveyor 52 and the main conveyor 50 for the out-conveyor 54 may not be operated. In such a case, the operation of the upstream device is prohibited until the circuit board is unloaded from the conveyors 52 and 54.

  The passing substrate transport device 24 is provided in parallel with the substrate transport support device 22 and has a length from one end to the other end in the transport direction of the printing press 10 as shown in FIG. The passing substrate transfer device 24 includes a conveyor device 170, a frame interval changing device 172, and a substrate stopping device 174 configured similarly to the conveyor device 100, the frame interval changing device 102, and the substrate stopping device 110 of the conveyors 52 and 54. The constituent elements having the same action are denoted by the same reference numerals to indicate the corresponding relationship, and the description thereof is omitted.

  The control device 30 is mainly composed of a computer and controls drive sources and the like of various devices constituting the printing press 10. Most of the motors constituting the drive source are a kind of electric motors, and are constituted by servo motors that are electric rotary motors capable of accurately controlling the rotation angle. You may comprise by a pulse motor or a linear motor. The control device 30 is centrally controlled by an overall control device 180 (see FIG. 1) that controls the entire electronic circuit assembly line. The overall control device 180 is mainly composed of a computer.

  As shown in FIG. 2, the shuttle conveyor 12 includes a conveyor body 200, a movable conveyor 202, and a movable conveyor moving device 204. The movable conveyor 202 includes a conveyor device 210 constituted by a belt conveyor, a frame interval changing device 212 for changing the interval between the pair of side frames 208 constituting the conveyor device 210, and changing the interval between the pair of conveyor belts 211, and A substrate stopping device 214 is provided. In this embodiment, the shuttle conveyor 12 is controlled by the control device 30 of the printing press 10 adjacent to the upstream side. A controller may be provided on the shuttle conveyor 12. Although the shuttle conveyor 12 has not been disclosed yet, it is configured in the same manner as the shuttle conveyor described in the specification of Japanese Patent Application No. 2010-110426 according to the present applicant, and detailed description thereof is omitted.

  In the present embodiment, the four mounting machines 14 are configured in the same manner as the electronic circuit component mounting machine described in Japanese Patent Application Laid-Open No. 2004-104075, and are modularized. As shown in FIG. Including a mounting machine main body 228, a substrate transport device 230, a substrate support device 232, a component supply device 234, a component mounting device 236, a control device 238, and the like, each of which mounts electronic circuit components on a single circuit board. , In parallel. The substrate transfer device 230 includes a pair of conveyors 240. These conveyors 240 are provided in parallel in the front-rear direction of the mounting machine body 228. In this embodiment, the conveyor 240 is constituted by a belt conveyor, and the interval between the pair of conveyor belts is automatically adjusted by a frame interval changing device (not shown). A substrate support device 232 is provided for each of the two conveyors 240, and a circuit board conveyed by any of the conveyors 240 is supported by the substrate support device 232, and mounting of electronic circuit components is performed. The control device 238 is composed mainly of a computer, and is controlled by the overall control device 180 in an integrated manner.

  In the electronic circuit assembly line configured as described above, solder is printed on the circuit board 74 in parallel in the two printing machines 10. In the printing machine 10, shuttle conveyor 12, and mounting machine 14, the distance between the pair of conveyor belts 64, 211, etc. of the conveyor devices 60, 100, 170, 210 and the conveyor 240 is the width of the circuit board on which the electronic circuit is assembled. It has been changed together. As a result, in the in-conveyor 52 of the substrate conveyance support device 22 of the printing machine 10, the stopper plate receiving device 116 fixed to the outer surface of the in-conveyor 52 is moved along with the movement of the movable side frame 68. The interval between the plate receiving devices 116 is changed according to the width of the circuit board 74 so that the stopper plate 112 is engaged with two portions corresponding to both side edges of the circuit board 74.

  Of the two printing machines 10, the circuit board 74 on which solder is printed in the upstream printing machine 10 is supplied to the board conveyance support device 22, supported by the board support device 62, brought into contact with the mask 34, and printed. Solder is printed by the device 28. After printing, the circuit board 74 is transferred to the movable conveyor 202 of the shuttle conveyor 12. Then, it is carried from the movable conveyor 202 to the passing substrate transport device 24 of the downstream printing machine 10 and passes through the printing machine 10, and by the shuttle conveyor 12 of the downstream printing machine 10, For example, it is carried into the rear conveyor 240 and electronic circuit components are mounted.

  Further, the circuit board 74 on which the solder is printed in the downstream printing machine 10 is supplied to the passing board conveying device 24 of the upstream printing machine 10, is passed through the upstream printing machine 10, and is transferred by the shuttle conveyor 12. It is carried in the board | substrate conveyance support apparatus 22 of the downstream printing machine 10, and solder is printed. Then, the shuttle conveyor 12 loads the electronic circuit component into, for example, the front conveyor 240 of the most upstream mounting machine 14.

  The circuit board 74 to be supplied to the board conveyance support device 22 is first carried into the in-conveyor 52. When the substrate is carried in, the stopper plate 112 is raised to the operating position. The upper end of the stopper plate 112 enters each groove 139 of the pair of stopper plate receiving devices 116 and is guided upstream in the transport direction by the guide surface 140. The relative position in the transport direction between the guide device 122 and the stopper plate receiving device 116 is determined so that the guide device 122 is positioned slightly downstream, and the guide surface 140 is located upstream in the transport direction. Since the inclination angle with respect to the ascending / descending direction is smaller than the guide surface 142 on the side, the amount of movement of the upper end of the stopper plate 112 in the conveying direction can be small, and the positioning accuracy of the stopper plate 112 in the conveying direction is improved. Finally, as shown in FIG. 6B, the guide surfaces 140 and 142 engage with the movable portion at the upper end of the stopper plate 112 to define the rising end position of the stopper plate 112, and the stopper plate 112 Is placed in the working position. The upper end portion of the stopper plate 112 is sandwiched and held by guide surfaces 140 and 142 from both sides in the conveying direction, and the stopper plate receiving device 116 fixed to each outer side surface of the pair of side frames 68 is used for the circuit board 74. Two parts corresponding to the side edges are supported.

  In this state, when the circuit board 74 is conveyed by the in-conveyor 52 and the downstream side end thereof comes close to the stopper plate 112, a part of the light emitted by the projector 152 is blocked. As a result, when the amount of light received by the light receiving unit 158 decreases and the output signal thereof falls below the set value, a detection signal is issued from the electric circuit 156 to the control device 30, and the control device 30 based on the detection signal The current supply (drive energy) to is cut off. In the present embodiment, the control device 30 constitutes a drive energy cutoff device.

  Since the downstream end detection device 150 is provided at a position adjacent to the stopper plate 112 on the upstream side in the transport direction, a part of the diffused light that is a diffusion portion of the light emitted by the projector 152 enters the stopper plate 112. Then, it is totally reflected and received by the light receiver 154. However, a large number of small-diameter through-holes 160 are formed in the upper end portion where the circuit board 74 of the stopper plate 112 comes into contact and stops moving, and in the state where the stopper plate 112 is located at the working position and close to the optical axis. Therefore, a part of the light hitting the stopper plate 112 is not reflected, but is totally reflected by the stopper plate 112 and the amount of light received by the light receiving unit 158 of the light receiver 154 is reduced. Therefore, the amount of light received by the light receiving unit 158 with respect to a change in the relative position between the emitted light and the downstream end of the circuit board 74 when the emitted light from the projector 152 is gradually blocked as the circuit board 74 moves. The rate of change is greater than when the total reflected light from the stopper plate 112 cannot be reduced, and the position detection accuracy of the circuit board 74 is increased.

  After the current supply is cut off, the rotating motor 70 rotates due to inertia, and the conveyor belt 64 and the circuit board 74 rotate and move due to inertia, so that the circuit board 74 is brought into contact with the stopper plate 112 and stopped. The stopper plate 112 is two portions separated in the width direction of the lower end portion thereof, and both ends thereof are supported by the guide device 122 and are two portions separated in the width direction of the upper end portion, and the circuit board. Since the portions corresponding to both end portions of 74 that are separated in the width direction are supported by the stopper plate receiving device 116, when the circuit board 74 comes into contact, the stopper plate 112 is separated by 2 in the width direction. It will bend in a state where the portion is supported, the stopper plate receiving device 116 is not provided, and the amount of bending can be significantly smaller than in the case of bending in a cantilever state, and the circuit board 74 is defined by the stopper plate 112. The accuracy of the stop position is increased. In particular, in this embodiment, since the guide device 122 has a gap between the guide rod 124 and the guide block 126, it is inexpensive, but on the other hand, the stopper plate is caused by the inclination of the guide rod 124 in the gap. Although the amount of movement of 112 to the downstream side in the conveyance direction increases, this increase in the amount of movement is also avoided by the presence of the stopper plate receiving device 116.

  Furthermore, since the inclination angle of the guide surface 140 on the downstream side of the stopper plate receiving device 116 with respect to the raising / lowering direction of the stopper plate 112 is intentionally reduced, the stopper plate 112 due to the contact force of the circuit board 74 to the stopper plate 112 is designed. Thus, the amount of movement of the portion with which the circuit board 74 abuts to the downstream side in the transport direction is small, and the effect of increasing the accuracy of the stop position of the circuit board 74 is obtained. Due to the effect of the inclined surface of the guide surface 140, a force that pushes down the stopper plate 112 is generated based on the abutting force, acting in the direction of contracting the air cylinder 130, and the stopper plate 112 based on the deflection of the stopper plate 112. When the upper end has a tendency to descend and the inclination angle of the guide surface 140 with respect to the raising / lowering direction of the stopper plate 112 is large, the above tendency becomes stronger and the movement toward the downstream side in the conveying direction accompanying the lowering of the upper end of the stopper plate 112. However, in this embodiment, the inclination angle of the guide surface 140 is small, because the amount of movement of the portion where the circuit board 74 abuts increases and the accuracy of the stop position of the circuit board 74 tends to decrease. As a result, a decrease in accuracy of the stop position is suppressed.

  In addition, since the guide rod 124 that guides the raising and lowering of the stopper plate 112 is fixed to the stopper plate 112 via the bush 129 made of honeynite, when the circuit board 74 abuts against the stopper plate 112, the stopper plate 112 and With the elastic deformation of the bush 129, the guide rod 124 is displaced with respect to the guide block 126, and the impact at the time of contact is alleviated. The guide rod 124 returns to the non-displaced state due to the restoration of the elastic deformation of the bush 129, but the guide rod 124 is not displaced again after returning to the non-displaced state due to the damping property of the bush 129. It quickly becomes stable. The bush 129 constitutes an impact mitigating member and a vibration suppressing member.

  The stopper plate 112 is opaque, and its width is larger than the maximum width of all the types of circuit boards 74 that can be transported by the in-conveyor 52, but a plurality of small diameter penetrating holes from the downstream side in the transport direction. Whether or not the circuit board 74 is near the stopper plate 112 can be visually confirmed through the hole 160. The large number of small diameter through holes 160 also serve as a plurality of through holes for visual recognition of the circuit board 74. The stopper plate 112 is lowered to the retracted position when the circuit board 74 is carried into the main conveyor 50 from the in-conveyor 52 and allows the circuit board 74 to be carried out.

  In a state where the circuit board 74 is brought into contact with the stopper plate 112 and stopped, the downstream end detection device 150 reduces the amount of light received by the light receiver 154 by the circuit board 74 and keeps its output signal below the set value. In this state, the circuit board 74 is detected. When the circuit board 74 is unloaded from the in-conveyor 52, if the upstream end of the circuit board 74 is disengaged from the projector 152 and the light receiver 154, the amount of light received by the light receiver 154 increases and the output signal exceeds the set value. The detection signal is not output from the electric circuit 156 to the control device 30. Thereby, it is confirmed that the circuit board 74 has been transferred from the in-conveyor 52 to the main conveyor 50. In this embodiment, since the downstream end detection device 150 is provided at the downstream end of the in-conveyor 50 together with the stopper plate 112, the substrate transfer detection device can also be used, thereby reducing the device cost. And there is no need to provide a space for two detection devices.

  Similarly, the circuit board 74 carried into the out conveyor 54 from the main conveyor 50 and the circuit board 74 carried into the passing board support device 24 are also positioned at the operation positions and held by the stopper plate receiving device 116. To stop with high positional accuracy.

  In the present embodiment, since the stopper plate 112 is provided at the downstream end of the in-conveyor 52, the out-conveyor 54, and the passing board conveying device 24, the circuit board 74 is placed in the in-conveyor 52 and up to a position adjacent to the main conveyor 50. It can carry in, can carry in to the passing board | substrate conveyance apparatus 24 and the out conveyor 54 to the position adjacent to the shuttle conveyor 12, and can be made to wait. Therefore, the circuit board 74 can be quickly carried into the main conveyor 50 and the shuttle conveyor 12.

  In addition, the board | substrate stop apparatus of the main conveyor 50 is good also as an apparatus containing a stopper plate, a raising / lowering apparatus, and a stopper board receiving apparatus similarly to the board | substrate stop apparatus 110. FIG. The present invention also relates to a substrate transport device other than the substrate transport device of the screen printing machine, for example, a substrate transport device provided on a substrate work machine such as an electronic circuit component mounting machine, a substrate inspection machine, an adhesive application machine, a reflow furnace, etc. The present invention can be applied to an apparatus for stopping a circuit board in the apparatus, a substrate stopping apparatus for a substrate transfer apparatus that is provided separately from the substrate work machine and transfers a circuit board.

  10: Screen printer 52: In-conveyor 54: Out-conveyor 110: Substrate stop device 112: Stopper plate 114: Lifting device 116: Stopper plate receiving device

Claims (5)

A substrate stopping device that is supported by a support surface of a belt conveyor and stops in contact with a circuit board that is conveyed in a conveying direction,
A stopper plate parallel to the width direction perpendicular to the conveying direction;
While holding the lower end portion of the stopper plate and raising and lowering in the raising and lowering direction perpendicular to the transport direction and the width direction, the upper end of the stopper plate is positioned below the support surface of the belt conveyor. An elevating device that elevates and lowers to a retracted position and an action position located above the support surface;
By engaging with the upper end of the stopper plate provided above the support surface of the belt conveyor and raised to the operating position, the upper end is prevented from moving at least downstream in the transport direction. A board stop device comprising: a stopper plate receiving device.   A first guide surface for guiding the upper end of the stopper plate, which is inclined toward the upstream side in the transport direction, and is raised to the working position toward the upstream side in the transport direction, the upper direction of the stopper plate receiving device; A second guide surface that is inclined in a direction toward the downstream side in the transport direction toward the upper side and guides an upper end of a stopper plate that is raised to the working position to the downstream side in the transport direction, and the first guide surface Between the first guide surface and the second guide surface in the transport direction is smaller than the thickness of the stopper plate, and both the first guide surface and the second guide surface engage with the upper corner of the stopper plate. Accordingly, the substrate stopping device according to claim 1, which also functions as a rising end position defining member that defines a rising limit of the stopper plate.   The belt conveyor includes a pair of conveyor belts that respectively support both side edges in the width direction of the circuit board to be transported, and the stopper plates are opposite to each other in the width direction of the pair of conveyor belts. The substrate stopping device according to claim 1, wherein the substrate stopping device has a width wider than a distance between two edges.   4. The substrate stop device according to claim 1, wherein the stopper plate receiving device is provided at a position where the pair of stopper plate receiving devices can be engaged with each of two portions of the stopper plate separated in the width direction. further,
A light projector and a light receiver provided opposite to each other at a distance larger than the width of the circuit board in the width direction of the circuit board; and at least a part of light from the light projector to the light receiver is a downstream end of the circuit board Including an electric circuit that emits the detection signal when the output signal of the light receiver drops below a set value by being blocked by the unit, and is disposed at a set distance upstream from the stopper plate in the transport direction, A downstream end detection device for detecting a downstream end of a circuit board conveyed by the belt conveyor and generating a detection signal;
A drive energy cutoff device that cuts off drive energy to the drive source of the belt conveyor in response to the detection signal from the downstream end detection device; and
The board | substrate stop apparatus in any one of Claim 1 thru | or 4 in which many small diameter through-holes were formed in the part contact | abutted to the downstream end of the said circuit board of the said stopper board.

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