JPH0774500A - Board back-up apparatus - Google Patents

Abstract

PURPOSE:To provide a board back-up apparatus having a removable back-up unit easy to treat and easily detachable in a short time in accordance with various types of the boards. CONSTITUTION:A board back-up apparatus has a back-up base part 30 that goes up and down freely, and a stationary back-up part 50 having a fitting hole for fitting a back-up pin and fixed to the base 30. In addition, the board back-up apparatus has removable back-up parts 54A to 54C having each fitting hole for fitting a back-up mounting pin and attracted through magnetic force to the side near the stationary back-up part 50. Since one or more detachable back-up parts 54A to 54C can be connected with the stationary back-up part 50, the board back-up apparatus can meet the need for various sizes of boards.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substrate backup device for supporting a lower surface of a printed circuit board for mounting electronic parts from below from a screen printer for printing cream solder or an adhesive.

[0002]

2. Description of the Related Art Conventionally, a guide / support mechanism as a device for supporting a printed circuit board at a constant height has been disclosed in Japanese Utility Model Laid-Open No. 1-81285.
No. This guide / support mechanism is configured such that a permanent magnet is integrated with the bottom surface of a rod-shaped body that supports the lower surface of the printed circuit board, and the rod-shaped body is held on the base plate made of a magnetic material by the magnetic attraction force of the permanent magnet. In this case, it is necessary to provide a permanent magnet for each rod-shaped body, and the rod-shaped body also becomes thick.

Further, a plurality of dedicated backup pin holding plates corresponding to various large and small printed circuit boards are prepared, and each time the lot is changed, the backup pin holding plates are exchanged according to the printed circuit board. The method is disclosed in Japanese Patent Laid-Open No. 2-14000. In this backup pin holding plate, backup pins are preliminarily set up in holes at positions suitable for the target substrate. In this case, the number of backup pin holding plates to be prepared increases as the number of types of printed circuit boards increases.

FIGS. 6 to 8 show a conventional example of a substrate backup device for a screen printing machine for cream solder printing, which the applicant of the present invention has already proposed. In these figures, 1 is a fixed support plate fixed to the frame of the screen printing machine, and fixed support arms 2 are vertically fixed to the four corners of the fixed support plate 1. A guide shaft 3 is horizontally fixed in the Y direction of FIG. 6 between a pair of opposing fixed support arms, and a ball screw shaft 4 is rotatably supported in parallel with the guide shaft 3. 5A and 5B are designated by reference numeral 20 in FIGS. 7 and 8.
Is a guide rail for moving the printed circuit board in the X direction, and a slide bearing 6 slidably fitted to the guide shaft 3 and a female screw member 9 screwed to the ball screw shaft 4 are fixed. There is. Since one of the ball screw shafts 4 is a right screw and the other is a left screw with respect to the center, rotating the ball screw shaft 4 changes the widths of the pair of guide rails 5A and 5B in the Y direction. The left and right ball screw shafts 4 are rotated in the same direction by a rotary drive source and a transmission mechanism (not shown) to narrow or widen the Y-direction distance between the guide rails 5A and 5B. This makes it possible to cope with a change in the width direction of the printed circuit board 20. In addition, the guide rails 5A, 5
A narrow belt 11 for transferring the printed circuit board 20 is provided along the opposite side edges of B. The belt 11 is stretched around a plurality of small pulleys provided on the guide rails 5A and 5B, respectively, and is driven and driven in the X direction by the driving force of a motor or the like (not shown) to move the printed circuit board 20 in the arrow Q direction. It is something to move forward. In addition,
A pressing member (not shown) that holds the printed circuit board is provided on each of the guide rails.

On the other hand, 30 is a backup base, and the backup base 30 is supported by a vertical guide shaft (fixed to a frame of a screen printing machine) (not shown) so as to be vertically movable. 7 and 8, a front side clamper mechanism 32A (which functions as a stopper) and a rear side clamper mechanism 32B for positioning the printed circuit board 20 in the X direction (traveling direction) are respectively ball screws at the center in the Y direction. The shafts 33A and 33B are provided so that their positions can be adjusted. On the backup base 30, side fixed backup plates 31 are arranged and fixed in two parallel rows in the X direction so as to sandwich the ball screw shafts 3A and 3B. Also, the side fixed backup plate 3
A fixed backup unit 50 is fixed to the center of the backup base 30 located between two parallel rows of the first backup unit. A large number of backup pin mounting holes 51A and 51B are regularly formed in the plate portion 50A of the fixed backup portion 50 and the side fixed backup plate 31, respectively, and the backup pin mounting holes 51A and 51B at arbitrary positions are formed. By inserting the backup pins 52A, 52B in the upright position, the backup pins 52A, 52B
You can attach a plurality of. The backup pins 52A and 52B support the lower surface of the printed circuit board 20 from below. As shown in FIGS. 7 and 8, the backup pins 52A and 52B are columnar, thin rod-shaped members having a tapered upper end, and thus fixed backups. The upper ends of the backup pin 52A standing on the portion 50 and the backup pin 52B standing on the side fixed backup plate 31 are located at the same height. The plate portion 50A of the fixed backup portion 50 has such an area that the backup pin 52A can be erected within the range occupied by the minimum specifications of the printed circuit board processed by the screen printing machine.

As shown in FIGS. 6 to 8, the front side clamper mechanism 32A includes a slider 35A which slides on a clamper moving rail 34A fixed so as to traverse the central portion of the backup base 30 in the X direction. The ball screw shaft 33 is mounted and fixed on the slider 35A.
Female screw member 36A screwed to A, and the female screw member 36A
A front clamper 37 which is pivotally supported by a mounting bracket portion 46A fixed above and is rotatable around a pivot point 38A.
A and a clamper actuating air cylinder 39A arranged and fixed on the female screw member 36A. And
An engaging member 40A is attached to the tip of the rod of the clamper operating air cylinder 39A.
Pin 41 fixed to the lower part of the front clamper 37A in the groove
A is engaged. As a result, when the air cylinder 39A is in the contracted state, the front clamper 37A stands up as shown by the solid line in FIG. 8, and when it is in the extended state, the front clamper 37A is in the closed state as shown by the imaginary line. The ball screw shafts 33A and 33B are rotatably supported by bearing members provided on the backup base 30.

The configuration of the rear clamper mechanism 32B is the same as that of the front clamper mechanism 32A.

The front clamper mechanism 32A and the rear clamper mechanism 32B hold the printed circuit boards evenly from the front and back of the screen lengthwise (X direction) side surfaces according to the dimensions of the printed circuit board, for example, based on the center of the screen printing machine. It is supposed to do. The front clamper mechanism 32A having the front clamper 37A is moved by rotating the ball screw shaft 33A by the rotational driving force of the motor 43 attached to the backup base 30 as shown in FIG. 6 and screwing the female screw member 36A. Can be executed by moving in the X direction, and the position of the front clamper 37A can be changed. The position of the rear clamper mechanism 32B having the rear clamper 37B can be changed by rotating the ball screw shaft 33B with the motor 43 in the same manner. Normally, when the ball screw shaft 33A is the right screw and the ball screw shaft 33 is the left screw and both are connected and used, one motor 4
3 for the front side clamper mechanism 32A and the rear side clamper mechanism 3
2B can be moved symmetrically.

The fixed backup section 50 has an area in which the backup pin 52A can be erected within a range occupied by the minimum specification of the printed circuit board 20 to be processed by the screen printing machine. Therefore, when the size of the printed circuit board 20 is larger than the minimum size, the front clamper 37A and the rear clamper 37B move outward, resulting in regions where the backup pins cannot be set up on both sides of the fixed backup unit 50 in the X direction. If the area in which the backup pin is not erected becomes large, good screen printing cannot be performed on the printed circuit board 20, so that the front clamper 37A or the rear clamper 37B moves to the outside in order to avoid this. The backup pin 5 for supporting the printed circuit board is also provided in the vacant area (where the printed circuit board occupies a place on the clamper moving path).
X of fixed backup unit 50 so that 2A can be set up.
On both sides in the direction, a set-up type backup section 84 which is detachable from the side fixed backup plate 31 is installed. The fitting type backup portion 84 is formed such that the width in the Y direction is larger than between the two parallel rows of the side portion fixed backup plate 31, and the backup pin mounting hole 5 is formed on the upper surface.
A large number of 1C are regularly formed, and a plurality of connecting pins 86 are fixed to both ends of the lower surface in the Y direction. The inset type backup portion 84 can be arranged on the side surface of the fixed backup portion 50 by inserting the lower end of each connecting pin 86 into the backup pin mounting hole 51B of the side fixed backup plate 31. In the backup pin mounting hole 51C of the fit-in type backup portion 84, the one having the same length as the backup pin 52A provided in the fixed backup portion 50 is vertically inserted.

[0010]

By the way, the printed board handled by the screen printing machine has not only various outer dimensions but also various positions of notches and large-diameter holes, and further, chip parts on the lower surface of the printed board. In some cases, etc. have already been installed. For this reason, the backup pin position will change as the printed circuit board handled changes,
Although work such as replacement (replacement with a different area), addition, and removal of the built-in backup unit 84 is required, the work of fitting the built-in backup unit 84 into the side fixed backup plate 31 is a built-in backup. The lower end of the connecting pin 86 of the portion 84 and the backup pin mounting hole 51B of the side fixed backup plate 31 need to be aligned, which takes time, and there is also a problem that insufficient fitting occurs. Since the assembling dimensional accuracy of the fitting type backup section 84 is directly reflected in the backup height accuracy, there is a drawback that the accuracy of the connecting pin 86 is required and the cost becomes high, and the connecting pin 86 is not chipped or damaged. As such, it requires careful handling. Further, in the case where the width of the fitting type backup portion 84 in the X direction is narrow, the number of connecting pins 86 provided in the fitting type backup portion 84 is small (one on each side), and the arrangement tends to tilt in the X direction and the arrangement becomes unstable. There is a fear.

In view of the above points, the present invention can be applied to various substrates, and the detachable backup unit which is detachable according to the type of the substrate can be easily handled, and the detaching operation can be performed easily and in a short time. It is an object of the present invention to provide a substrate backup device that can also improve the height accuracy that supports the substrate.

[0012]

In order to achieve the above object, a substrate backup device of the present invention comprises a backup base which can be raised and lowered and a fixed backup which has a backup pin mounting hole and is fixed to the base. And a detachable backup part that has a backup pin mounting hole and is magnetically attracted to the fixed backup part side.

The fixed backup section may have a first connecting magnetic member, and the removable backup section may have a permanent magnet magnetically attracted to the first connecting magnetic member.

Further, the removable backup section may have a second connecting magnetic member, and the permanent magnet may be fixed to one end face of the second connecting magnetic member in the front-rear direction.

[0015]

In the substrate backup device of the present invention, first, the fixed backup unit is fixed in the range occupied by the minimum substrate required by the specifications, and the removable backup unit is added to the fixed backup unit by magnetic attraction according to the size of the substrate. Since they are arranged, it is possible to deal with substrates having various outer dimensions. The attachment / detachment work of the removable backup unit is extremely simple because it is performed by magnetic attraction. Compared with the conventional embedded backup unit, the attachment / detachment work can be performed quickly and accurately, and the structure of the removable backup unit is simple and easy to handle. The manufacturing cost can be reduced, and the height accuracy of supporting the substrate can be improved. Further, even when handling various substrates having notches or large-diameter holes, the substrates can be supported at a constant height simply by inserting and arranging the backup pins into appropriate backup pin mounting holes.

Further, the fixed backup portion is provided with a first connecting magnetic member, and the removable backup portion is provided with a second magnetic member.
If a permanent magnet that is magnetically attracted to the first connecting magnetic member is fixed to one of the end faces of the second connecting magnetic member in the front-rear direction, the fixed backup is already provided. It is possible to magnetically fix the permanent magnet side of another removable backup unit to the second connecting magnetic member of the removable backup unit that is fixed to the other unit. Therefore, a plurality of removable backup units can be used in combination, and it is possible to cope with a board having a larger outer dimension or a board having various outer dimensions.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of a substrate backup device according to the present invention will be described below with reference to the drawings.

1 to 5 show an embodiment of the present invention. In these figures, 30 is a backup base, and the backup base 30 is slidably supported by a vertical guide shaft (fixed to a frame of a screen printing machine) (not shown) so as to be vertically movable. As shown in FIGS. 2 and 3, the side fixed backup plate 31 has a ball screw shaft 33A,
It is arranged and fixed in two parallel rows in the X direction so as to sandwich 33B. A fixed backup section 50 is fixed to the center of the backup base 30 located between the two parallel rows of the side fixed backup plates 31. A large number of backup pin mounting holes 51A and 51B are regularly formed in the plate portion 50A of the fixed backup portion 50 and the plate portion 31A of the side portion fixed backup plate 31, respectively. Backup pin 52 in holes 51A and 51B
By inserting and standing A and 52B, a plurality of backup pins 52A and 52B that support the printed circuit board 20 from below can be attached. In addition, on the lower surface of the plate portion 50A of the fixed backup portion 50, there is provided a first back plate which does not have a hole to prevent the backup pin from penetrating.
The magnetic members 53 for connection are fixed by being superposed, and the plate portion 31 of the side fixed backup plate 31 is similarly fixed.
A back plate 31B without holes is also fixed to the lower surface of A by overlapping. The upper ends of the backup pin 52A standing on the fixed backup section 50 and the backup pin 52B standing on the side fixed backup plate 31 are located at the same height. The plate portion 50A of the fixed backup portion 50 has such an area that the backup pin 52A can be erected within the range occupied by the minimum specifications of the printed circuit board processed by the screen printing machine. The printed circuit board 20 is provided at the center of the backup base 30.
Front clamper mechanism 32A and rear clamper mechanism 32B for performing positioning in the X direction (traveling direction) of
Are provided so that their positions can be adjusted by ball screw shafts 33A and 33B, respectively.

The configurations of the front side clamper mechanism 32A and the rear side clamper mechanism 32B are the same as those described in the conventional example of FIGS. 6 to 8, and the rear side clamper mechanism 32B also slides on the clamper moving rail 34B. Slider 35B, a female screw member 36B fixed on the slider 35B and screwed to the ball screw shaft 33B, and a mounting bracket portion 46 fixed on the female screw member 36B.
The rear clamper 37B is pivotally supported at B and is rotatable about a pivot point 38B, and a clamper actuating air cylinder 39B is arranged and fixed on the female screw member 36B. The air cylinder 3 for operating the clamper
An engaging member 40B is attached to the tip of the rod of 9B, and a fixed pin 41B is engaged with the lower portion of the rear clamper 37B in the groove of the engaging member 40B. As a result, when the air cylinder 39B is in the contracted state, the front clamper 37B stands up as shown by the solid line in FIG. 1, and when it is in the expanded state, the front clamper 37B is in the closed state as shown by the imaginary line.

The front-rear clamper mechanism 32A and the rear-side clamper mechanism 32B hold the printed circuit board evenly from the front and rear with reference to the center of the screen printing machine from both sides in the circuit board length direction (X direction) according to the size of the printed circuit board. It is supposed to do. A mounting member 71 having a board detection sensor 70 for detecting the presence or absence of the printed board 20 is fixed to the inner side surface of the front side clamper mechanism 32A facing the rear side clamper mechanism 32B.

The front and rear clamper mechanisms 32 are also provided.
As shown in FIG. 1, the inside of the A and 32B facing the fixed backup unit 50 has front and rear clamper mechanisms 32A and 32A.
A space S into which the upper surface of the fixed backup unit 50 can be embedded is provided below the lower portion 32B.

Further, front and rear clamper mechanisms 32
A plurality of backup button pin mounting holes 51D are regularly provided on the upper surfaces of the mounting bracket portions 46A and 46B of A and 32B and the upper surface of the mounting member 71.
Backup button pin 72 to support 0 from below
Can be appropriately provided. The height of the upper end of the backup button pin 72 when it is vertically installed is the same as the height of the upper ends of the backup pins 52A and 52B.

As shown in FIG. 1, the fixed backup portion 50 is a leg portion (also serving as a bearing portion for the ball screw shafts 33A and 33B) which is vertically fixed on the backup base 30.
0B, a first connecting magnetic member 53 made of a magnetic material such as iron fixed to the leg portion 50B, and a plate portion 50A. The first connecting magnetic member 53 has portions that are vertically bent on both sides in the X direction. The plate portion 50A of the fixed backup portion 50 has an area in which the backup pin 52A can be erected within the range occupied by the minimum specification of the printed circuit board processed by the screen printing machine. If the printed circuit board is larger than the minimum printed circuit board, the printed circuit board may be located in a range where the printed circuit board occupies a place on the path where the front clamper mechanism 32A having the front clamper 37A or the rear clamper mechanism 32B having the rear clamper 37B moves. In order to be able to stand up a backup backup pin, a detachable backup unit 54 is installed on one or both sides of the fixed backup unit 50 in the X direction according to the length of the printed circuit board.

As shown in FIGS. 1 and 4, the removable backup section 54 has a backup pin mounting hole 5 on the upper surface thereof.
A main body 55 having a large number of 1E regularly and having the same width in the Y direction as the fixed backup part 50, leg portions 56 fixed to both sides of the lower surface of the main body portion 55 in the Y direction, and the leg portion 56 of the leg portion 56. The second connecting magnetic member 57 is provided in the middle. The second connecting magnetic member 57 is formed of a magnetic material such as iron, has a plurality of backup pin mounting holes 51F regularly on the upper surface thereof, and is an intermediate flat plate portion projecting outward in the Y direction. 58 and has a permanent magnet 5 on one end face in the X direction (front-back direction) of the second connecting magnetic member 57.
9 is fixed. The removable backup unit 54
The distance between both ends of the pair of second connecting magnetic members 57 located on both sides in the Y direction is slightly smaller than the distance between the two parallel rows of the side fixed backup plates 31. In addition, back plates 55A and 58A for preventing the backup pin from penetrating are superposed on the lower surfaces of the main body 55 and the intermediate flat plate portion 58, respectively.

To install the removable backup section 54 on the side surface of the fixed backup section 50 in the X direction, the bottom surface of the leg section 56 is placed on the backup base 30, and the first backup magnetic field of the fixed backup section 50 is mounted. This is performed by magnetically attracting the end surface of the removable backup unit 54 having the permanent magnet 59 to the member 53. In addition, the removable backup unit 54
In addition, another removable backup unit 54 can be additionally installed. This is the other removable backup unit on the end surface of the removable backup unit 54 without the permanent magnet 59 of the second connecting magnetic member 57. This is performed by magnetically attracting the end face of the permanent magnet 59 of 54. When the removable backup section 54 is installed on the side surface of the fixed backup section 50, the upper surface of the fixed backup section 50 and the upper surface of the main body section 55 of the removable backup section 54 have the same height, and the upper surface of the side fixed backup plate 31. And the upper surface of the intermediate flat plate portion 58 of the removable backup portion 54 are at the same height.

As the removable backup unit 54, X
A plurality of types having different directional lengths are prepared. For example, as shown in FIG. 5, the removable backup units 54-A, 54-
It is possible to prepare three types of B and 54-C, and to use them in an appropriate combination depending on the length of the printed circuit board 20 in the X direction.

The backup pin inserted into the backup pin mounting hole 51E on the upper surface of the main body 55 of the removable backup section 54 is the same as the backup pin 52A provided on the fixed backup section 50, and the upper surface of the intermediate flat plate section 58. The backup pin inserted into the backup pin mounting hole 51F and standing upright has the same length as the backup pin 52B provided on the side fixed backup plate 31.

In FIG. 1, 25 is a screen frame of the screen printing machine, and 26 is a screen stretched over it. The fixed support plate 1 and the rails 5A and 5B
The configuration of etc. is the same as that of the conventional example shown in FIGS.

Next, the overall operation of the above embodiment will be described. First, according to the length in the X direction and the width in the Y direction of the printed circuit board 20 to be received, the front clamper 37 is
The positions of the front clamper mechanism 32A having A and the rear clamper mechanism 32B having the rear clamper 37B are adjusted, and the distance between the rails 5A and 5B is adjusted.
The fixed backup unit 5 is moved by the movement of the front clamper mechanism 32A and the rear clamper mechanism 32B.
Detachable backup unit 5 in the space created on both sides of 0 in the X direction
Place 4 without any gaps. That is, the leg portion 56 of the removable backup unit 54 is placed on the backup base 30, and the second connecting magnetic member 5 having the permanent magnet 59.
The end face of 7 is magnetically attracted to the first connecting magnetic member 53 of the fixed backup unit 50. Detachable backup unit 54
When the next removable backup unit 54 is mounted adjacent to, the leg 56 of the removable backup unit 54 is placed on the backup base 30 and the permanent magnet 95 is installed.
The magnetic force is magnetically attracted to the end surface of the second connecting magnetic member 57 of the detachable backup unit 54, which has been installed in step 1, without the permanent magnet. At this time, the entire length of the removable backup unit 54, which is added by appropriately combining the removable backup units 54-A, 54-B, and 54-C having different lengths in the X direction, is made appropriate.

Then, the side fixed backup plate 31, the fixed backup unit 50, the detachable backup unit 54, the front side clamper mechanism 32A, the mounting member 71 and the rear side clamper mechanism 32 within the range occupied by the printed circuit board 20.
Appropriate backup pin mounting holes 51A, 51B, 5 for B
Backup pins 52A and 52 on 1D, 51E and 51F
B. Insert the backup button pin 72 upright.

In the fixed backup section 50 and the detachable backup section 54, the front side clamper mechanism 32 is provided.
When A, the mounting member 71, and the rear clamper mechanism 32B overlap, the backup pin cannot be erected in the overlapping range, so instead, the front clamper mechanism 32A, the mounting member 71, and the rear clamper mechanism 32B are backed up. The backup button pin 72 is inserted and erected in the pin mounting hole 51D.

Next, as shown in FIG. 1, the backup base 3
In the state where 0 is the most lowered position, first, the front side clamper 37A is erected as shown by the solid line, and the rear side clamper 37B is set in a state in which the phantom line is hidden.
Is supplied in the direction of arrow Q in FIG. 3, and the front clamper 37A defines the front end position of the printed circuit board 20. Then, the rear clamper 37B is raised to define the rear position of the printed board 20. At this time, the printed circuit board 20 is supported at a constant height by the guide rails 5A, 5B and the belt 11 of FIG.
Pressed along 5B.

Then, as shown in FIG. 1, the backup base 30 is raised until the upper ends of the backup pins 52A and 52B and the backup button pin 72 come into contact with the lower surface of the printed circuit board 20. At this time, the printed circuit board 20
The upper surface of the side edge is pressed from above by the pressing member provided on the guide rail side and maintained at a constant height, and the lower surface is supported and held by the backup pin from below. At this time, since the upper ends of the backup pins 52A and 52B and the backup button pin 72 provided in the respective backup pin mounting holes have the same height,
The printed board 20 is supported so that its upper surface is flat.

Then, the front side clamper 37A and the rear side clamper 37B are turned down, the backup base 30 is further raised, and the printed circuit board 20 is brought into contact with the screen 26 supported by the screen frame 25. Then, screen printing can be performed in this state, and application of cream solder or the like onto the printed circuit board can be performed. At this time, the backup pins 52A and 52B provided upright on the fixed backup unit 50 and the removable backup unit 54, and the front clamper mechanism 32A.
Also, the upper surface of the back side clamper mechanism 32B side and the backup button pin 72 keeps the upper surface of the printed circuit board 20 flat and eliminates the warp of the printed circuit board.

To change the length of the printed circuit board 20 in the X direction, several types (for example, three types) of removable backup units 54-A arranged on the side surface of the fixed backup unit 50 are used.
The combination of 54-B and 54-C is appropriately changed, and the front side clamper mechanism 32A, the rear side clamper mechanism 32B, and the mounting side are attached to the intermediate length which is less than the minimum length of the removable backup unit in the X direction. The member 71 is fixed to the fixed backup unit 50 or the removable backup units 54-A, 54-B, 5
It is possible to respond steplessly by appropriately overlapping the upper surface of 4-C and adjusting the distance between the front side clamper mechanism 32A and the rear side clamper mechanism 32B. The width in the Y direction can be changed by adjusting the distance between the rails 5A and 5B and changing the arrangement of the backup pin 52B standing on the side fixed backup plate 31. Further, regarding the change of the cutouts and large diameter holes of the printed circuit board 20 and the positions of already mounted parts, the backup pins 52A and 52B and the backup button pin 72 are arranged at positions avoiding the cutouts, large diameter holes and parts. do it.

According to the above embodiment, the removable backup units 54-A, 54- with respect to the fixed backup unit 30.
Since the attachment and detachment work of B and 54-C can be done by magnetic attraction, it is very easy and the fixed backup portion 30 is fitted by inserting the connecting pin into the backup pin mounting hole of the side fixed backup plate like the conventional fit-in type backup portion.
There is no inconvenience caused by the work of arranging on the side surface in the X direction.

Further, compared with the conventional example, the removable backup parts 54-A, 54-B, 54-C are easy to handle and low in cost, and the precision of the leg parts 56 improves the printed circuit board 20. The supporting height accuracy can be improved, and the arrangement of the removable backup units 54-A, 54-B, 54-C can be changed quickly and accurately. Also, the backup pin 52
The work of attaching and detaching the A, 52B and the backup button pin 72 is easy and can be performed in a short time, and it is possible to promptly deal with notches, large-diameter holes, and various printed boards having already mounted parts.

Although three types of removable backup units having different lengths in the X direction are prepared in the above embodiment, removable backup units having other lengths may be prepared.

Further, a mechanism using a cam, a mechanism using an air cylinder, or the like can be adopted as the elevating means of the backup base 30.

In FIG. 1, the fixed backup unit 50 is illustrated as having a number of removable backup units 54 installed on one side of the fixed backup unit 50 in the X direction.
Removable backup parts 5 of the same type on both sides in the X direction
By arranging 4 symmetrically, it is possible to deal with the case where the center reference of the fixed backup unit 50 is made to coincide with the center reference of the printed circuit board and the front and rear clampers 37A, 37B are moved.

Although the embodiments of the present invention have been described above, it is obvious to those skilled in the art that the present invention is not limited to this and various modifications and changes can be made within the scope of the claims. Let's do it.

[0042]

As described above, according to the board backup device of the present invention, the fixed backup section is fixed in the range occupied by the minimum board required by the specifications, and the fixed backup section is attached / detached according to the size of the board. Since the backup unit is arranged by magnetic attraction, the backup pins can be erected so as to correspond to substrates of various outer dimensions. The attachment / detachment work of the removable backup unit is extremely easy because it is performed by magnetic attraction.Compared to the conventional embedded backup unit, the removable work can be performed more quickly and accurately, and the structure of the removable backup unit is also simple. It is easy to handle, the manufacturing cost can be reduced, and the height accuracy of supporting the substrate can be improved. Further, even when handling various substrates having notches, large-diameter holes, and already mounted components, the substrate can be supported at a constant height simply by inserting and arranging the backup pins into appropriate backup pin mounting holes. Therefore, it can easily support various printed circuit boards,
It is possible to realize a substrate backup device which is easy to handle and low in cost, and which is also suitable for a screen printing machine that is excellent in substrate supporting accuracy.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a configuration of a main part of an embodiment of a substrate backup device according to the present invention.

FIG. 2 is a side sectional view showing details of a front clamper mechanism in the embodiment.

FIG. 3 is a plan view of the embodiment.

FIG. 4 is a perspective view showing details of a removable backup unit in the embodiment.

FIG. 5 is a plan view showing an arrangement state of a fixed backup unit and a removable backup unit in the embodiment.

FIG. 6 is a plan view of a conventional example of a substrate backup device.

FIG. 7 is a side sectional view showing details of a front side clamper mechanism and a fitting type backup section in a conventional example.

FIG. 8 is a front view showing details of a front clamper mechanism in a conventional example.

[Explanation of symbols]

 1 Fixed support plate 5A, 5B Guide rail 20 Printed circuit board 30 Backup base 31 Side fixed backup plate 32A Front side clamper mechanism 32B Rear side clamper mechanism 37A Front side clamper 37B Rear side clamper 50 Fixed backup side 51A to 51F Backup pin mounting hole 52A , 52B backup pin 53 first connecting magnetic member 54 detachable backup unit 57 second connecting magnetic member 59 permanent magnet

Claims (3)

[Claims] 1. A vertically movable backup base, a fixed backup portion having a backup pin mounting hole fixed to the base, and a magnetic attraction to the fixed backup portion side having a backup pin mounting hole. And a removable backup unit that is used. 2. The fixed backup part has a first connecting magnetic member, and the removable backup part has the first magnetic member.
2. The substrate backup device according to claim 1, further comprising a permanent magnet that is magnetically attracted to the connecting magnetic member. 3. The detachable backup section has a second connecting magnetic member, and the permanent magnet is fixed to one end face in the front-rear direction of the second connecting magnetic member.
The board backup device described.