JPH0572758B2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field The present invention relates to a printed circuit board rack that accommodates and supports a plurality of printed circuit boards in multiple stages between opposing movable side plates and fixed side plates, and handles the plurality of printed circuit boards as one unit. When mounting electronic components on a printed circuit board, the rack for the printed circuit board is transported to the adjustment position and positioned, and then the movable side plate is moved to automatically adjust the storage width to the specified width, that is, the distance between it and the fixed side plate. The present invention relates to an automatic storage width adjustment device for a printed circuit board rack.

BACKGROUND TECHNOLOGY Conventionally, printed circuit board racks, for example,
As shown in the figure, a plurality of aluminum columns 1...
An upper plate 2 and a lower plate 3 made of soft aluminum are attached to the top plate, and left and right side plates 4 and 5 are provided. and,
A plurality of horizontal engagement grooves 4a, 5a are formed in the side plates 4, 5, respectively, corresponding to the left and right sides, and by inserting the printed circuit board 6 as shown by the two-dot chain line in the figure, it is inserted into the side plates 4, 5. It is designed to be able to support multiple printed circuit boards in multiple stages by spanning between them. By the way, in this type of printed circuit board rack, the other side plate 5 is fixed so that it can accommodate printed circuit boards of different widths, but one side plate 4 is fixed.
are movable, and the storage width, that is, the distance l between the side plates 4 and 5 can be adjusted.

That is, as shown in FIG. 2, a slide frame 7 is fixed to the outside of the movable side plate 4, and the upper and lower ends of the slide frame 7 are fixed with fastening members 8 such as bolts and screws. Those fastening members 8... are each connected to a first
The long hole 2a of the upper plate 2 and the long hole 3 of the lower plate 3 shown in the figure
Penetrate through a. The long holes 2a and 3a are formed parallel to each other from the left end of the upper plate 2 and the lower plate 3 toward the right.

Conventionally, when storing and supporting printed circuit boards of different widths in the printed circuit board rack having the above-described structure, for example, the movable side plates 4 are moved along the elongated holes 2a, 3a, and the side plates 4, 5 are moved. After adjusting the distance l between them and adjusting the storage width, the fastening member 8...
was tightened to fix the position of the movable side plate 4.

However, conventionally, when adjusting the storage width of the printed circuit board rack in this way, the fastening member 8...
When the movable side plate 4 is tightened, the rotational force of the tightening is transmitted to the slide frames 7, 7, causing warpage and deformation of the movable side plate 4 as shown in FIG. 3, for example. For this reason, problems such as difficulty in inserting and removing the printed circuit board 6 and non-smooth movement of the movable side plate 4 have arisen.

Furthermore, since not only the upper ends but also the lower ends of the slide frames 7, 7 are fixed with the fastening members 8..., there is a problem that the work efficiency when adjusting the storage width is very poor; There is a problem in that the structure of this type of storage width automatic adjustment device is complicated.

OBJECT Therefore, an object of the present invention is to provide an automatic storage width adjustment device that automatically adjusts the storage width of a rack for printed circuit boards without deforming the movable side plate and with high work efficiency, without complicating the structure. It is about providing.

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

FIG. 4 shows a printed circuit board rack used in an automatic storage width adjustment device which is an embodiment of the present invention. The printed circuit board rack is assembled by erecting two support frames 10, 10 and 12 on the left and three support frames 10, 10 and 12 on the right, attaching an upper plate 14 on top of these support frames, and attaching a lower plate 16 below. The upper plate 14 and the lower plate 16 are made of hardened aluminum plates and are robust.

As shown in FIG. 5, the left support frames 10, 10 are formed by bending the entire body into a rail shape by sheet metal bending to increase strength, and both flat parts 18, 1
8 and a bent portion 20 having a U-shaped cross section, and the upper and lower ends are bent outward and a top plate 22 and a bottom plate 24 are welded thereto for reinforcement. Then, the assembled plate bolt 26 passing through the upper plate 14 is screwed into the nut 28 through the top plate 22, and the assembled plate bolt 30 passing through the lower plate 16 is screwed through the bottom plate 24, with both flat parts 18, 18 facing outward. Bending part 2
0 protrudes inward to ensure secure fixation.

On the other hand, the right support frame 12 is similarly formed by sheet metal bending, and has flat parts 34, 34 on both sides and a bent part 36, as shown in FIG. A top plate 38 and a bottom plate 40 are each welded together. Then, the assembly bolts 42, 42 passing through the upper plate 14 are inserted into nuts (not shown) through the top plate 38, and the assembly bolts 42 passing through the lower plate 16 are attached to nuts (not shown).
4, 44 are screwed into nuts 46, 46 through the bottom plate 40, and are securely fixed with the flat parts 34, 34 on both sides facing inward and the bent part 36 protruding outward, contrary to the support frames 10, 10 on the left side. Ru. Right side support frame 1
2, a plurality of mounting bolts 48 passing through the flat surface portion 34 on one side are screwed into respective nuts 50, and a fixed side plate 52 is attached. The fixed side plate 52 closes the right side surface of the rack, and has a plurality of horizontal engagement grooves 54 formed on its inner surface.

As can be seen from FIG. 4, a movable side plate 56 is provided on the left side of the rack, facing the fixed side plate 52, and closing the left side surface of the rack. Similarly, a plurality of horizontal engagement grooves 58 are formed on the inner surface of the movable side plate 56 in correspondence with the engagement grooves 54 of the fixed side plate 52.

As shown in FIG. 1, for example, both sides of the printed circuit board are engaged with the corresponding engagement grooves 58 on the left side and engagement grooves 54 on the right side.
A plurality of printed circuit boards are placed and stored in multiple stages within the rack.

Slide frames 60, 60 are fixed to the outer surface of the movable side plate 56, as shown in FIGS. 4 and 7.
Like the support frame 10, the slide frame 60 is formed by bending the entire body into a rail shape by sheet metal bending.
Both side flat parts 62, 62 and a bent part 64 having a U-shaped cross section
Furthermore, the upper and lower ends are bent outward and a reinforcing top plate 66 and bottom plate 68 are welded thereto. Moreover, both side flat parts 62, 6 of the slide frame 60
Suction plates 70, 70 are fixed between the two.

The support rods 72, 72 are inserted into the bent portions 64 of such slide frames 60, 60. As can be seen from FIG. 8, the support rod 72 has a flange 74 at the lower end, and an engaging portion 76 on the flange 74.
has. Further, a circumferential groove 78 is cut slightly above the engaging portion 76. Then, it is inserted through the bottom plate 68 through the long holes 80, 80 formed in the lower plate 16, and after the engaging part 76 is fitted into the long hole 80 and prevented from rotating, the E ring 82 is inserted into the circumferential groove 78. Fit and prevent it from falling out. The long holes 80, 80 are formed parallel to each other from the left end of the lower plate 16 toward the right.

Fixing screws 84, 84, which are fastening members, are screwed into the upper ends of such support rods 72, 72.
As can be seen from FIG. 7, the fixing screw 84 is
4 and a spring washer 86 and a large diameter flat washer 88.
Elongated holes 90, 90 formed in the upper plate 14 with
is inserted through the top plate 66. and,
By tightening the fixing screws 84, 84, the position of the movable side plate 56 can be reliably fixed. Here, the reason why the large-diameter flat washers 88 are used is that deformation and scratches on the side edges of the long holes 90 can be reduced. This is intended to maintain smooth movement of the movable side plate 56 at all times. Note that the elongated holes 90, 90 are made parallel to each other from the left end of the upper plate 14 toward the right, corresponding to the elongated holes 80, 80 of the lower plate 16.

The symbol 92 in the figure is a drop-off prevention rod,
The rack is inserted through a through hole in the upper plate 14 and into a through hole in the lower plate 16, which is opened in correspondence with the through hole, to prevent the printed circuit board housed in the rack from falling off. As shown in FIG. 9, a receiving plate member 94 is applied to the lower side of the through hole of the lower plate 16, and receives the lower end of the fall prevention rod 92 to prevent it from falling off.

Therefore, in the above-mentioned printed circuit board rack,
By loosening the fixing screws 84, 84 and moving the movable side plate 56 along the elongated holes 90, 90 and the elongated holes 80, 80, the distance between the side plates 52, 56, that is, the storage width, can be adjusted, and prints of different widths can be made. It can also be made compatible with substrates. After adjustment, tighten the fixing screws 84, 84 again, and move the movable side plate 56.
fix the position. At this time, since the fixing screw 84 is only loosely fitted into the hole of the slide frame 60, the rotation of the fixing screw 84 is not transmitted. Support rod 7
2, since the engaging portion 76 engages with the elongated hole 80 of the lower plate 16 to prevent rotation, the fixing screw 84 easily screws into the support rod 72, and the support rod 72 is rotated in the longitudinal direction. The movable side plate 56 is reliably fixed between the upper plate 14 and the lower plate 16.

Next, an automatic storage width adjustment device for automatically adjusting the storage width of the above-mentioned printed circuit board rack will be explained.

FIGS. 10 and 11 show the storage width automatic adjustment device. In the figure, the part designated by the reference numeral 100 is an automatic storage width adjustment machine, and the part designated by 102 is a roller conveyor device (rack conveyance mechanism).

The roller conveyor device 102 has a plurality of rollers 106 arranged on a conveyor table 104, and guide plates 1 on both sides.
It is equipped with 08... Then, the printed circuit board rack 110 placed on the rollers 106 is sent in the direction of the arrow in the figure while being guided by the guide plates 108, and is sequentially fed into the storage width automatic adjustment machine 100 described above. The racks for substrates are sent out one by one from the storage width automatic adjustment machine 100.

The roller conveyor device 102 is equipped with a stop plate 112 in front of the automatic storage width adjuster 100. The stop plate 112 is installed in a direction across the conveyance table 104 between two adjacent rollers 106, 106, is movable up and down, and temporarily receives the sent printed circuit board rack 110. Reference numeral 114 in the figure is a brake, which detects when the printed circuit board rack 110 is stopped in front with optical sensors (not shown) provided at each position.
It acts on the rollers 106 and stops them, thereby stopping the feeding of the printed circuit board rack 110.

The printed circuit board rack 110 that has stopped against the stop plate 112 is pressed against the guide plate 108 by biasing cylinders 116, 116 provided on one side of the carrier 104, and its inclination is corrected. Thereafter, the stop plate 112 is lowered, and the printed circuit board rack 110 is fed into the storage width automatic adjustment machine 100 in a constant state.

The printed circuit board rack 110 fed into the automatic storage width adjustment machine 100 stops against a stop plate 118 shown in FIGS. 12 and 13. Stop plate 1
Similarly to the stop plate 112 described above, the conveyor table 18 is placed between two adjacent rollers 106, 106.
4, and is movable up and down by a cylinder 119.

Although not shown, the size of the printed circuit board rack 110 received by the stop plate 118 is automatically determined by an optical sensor installed in the storage width automatic adjustment machine 100. Then, it is pushed upward by the lift rods 120, and the contact with the rollers 106 is released. One lift rod 120 is provided between the rollers 106 in the storage width automatic adjustment machine 100, and they are operated simultaneously.

Rack 110 for printed circuit board pushed up
The corner is pressed by the bifurcated tip of the positioning cylinder 122 or 124, and is pressed against the stop plate 118 and the reference plates 126, 128. Whether to operate the positioning cylinder 122 12
4 is to be operated or not, depending on the size of the rack that was automatically determined by the optical sensor earlier. After positioning, the printed circuit board rack 110
As shown in Fig. 13, the upper and lower fixed cylinders 1
30, 132, upper and lower reference plates 1
26, 128 and is securely fixed. Here, the reference plates 126, 12
8, its position can be adjusted back and forth.

In the illustrated storage width automatic adjustment device, the printed circuit board rack 110 is pushed up and positioned and fixed by the lift rods 120. Therefore, the height position of the rack can be accurately positioned, and the height position of the rack 110 can be accurately determined with respect to the reference plates 126, 128, etc. It is possible to accurately obtain the right angle and press the rack without deforming it.

By the way, in the storage width automatic adjustment device shown in FIGS. 10 and 11, the printed circuit board rack 11
0 fixed side plate 52 is the reference plate 126, 128
side, and the movable side plate 56 is the fixed cylinder 130,
The printed circuit board rack 110 must be set on the rollers 106 so that it is on the 132 side. Therefore, when the printed circuit board rack 110 is securely fixed, the rack position detection air cylinder 134 detects whether the set state of the rack is normal or not. It hangs down from the automatic adjuster 100 side, and has a piston 136 and a lowering detection switch 138 and a higher detecting switch 140 for the piston 136, as shown in FIG. When the printed circuit board rack 110 is properly set, the piston 136 is inserted into the detection hole 142 of the rack, and the lowering detection switch 13 is inserted.
8 and confirm its normal set state.
However, when the rack 110 is set upside down as shown in FIG. 15A, or when it is set upside down as shown in FIG. As a result, the lowering detection switch 138 is not activated, and it is detected that the lowering detection switch 138 has been set abnormally.

By the way, although it seems that the printed circuit board rack shown in FIG. 4 does not have a detection hole, in reality, one through hole of the upper plate 14 through which the drop-off prevention rod 92 is inserted is used as the detection hole 142. do. and,
Air cylinder 13 for easy position detection is installed in the through hole.
By inserting the piston 136 of No. 4, it is confirmed that the set state of the rack is normal.

Note that instead of using the air cylinder 134, it is also possible to check the set state of the rack using an optical sensor, but it is difficult to align the optical axis of the reflected light using an optical sensor. Furthermore, with magnetic sensors, there is concern about the effect on printed circuit boards, and the reaction is unstable. Proximity switches have problems such as the need to be close to the rack, which makes them difficult to design.

When it is confirmed that the printed circuit board rack 110 is properly set, the stepping motor 144 shown in FIG. 16 is driven. A stepping motor 144 rotates a roller 148 through a flexible coupling 146 and transmits rotation of the roller 148 to another roller 152 using a timing belt 150. roller 15
2 is fixed to a ball screw shaft 154 and rotates on the ball screw shaft 154. A ball screw nut 156 is screwed onto the ball screw shaft 154, and when the ball screw shaft 154 rotates, the ball screw nut 156 is fixed to the drive plate 15.
Move 8 forward (to the front left in the figure).

The tail ends of horizontal shafts 160, 160 whose positions are fixed are fixed to the drive plate 158, and horizontal shafts 162, 162, whose widths are adjustable, slidably support the tail ends of the horizontal shafts 160, 160. be done. horizontal shaft 16
0.160 penetrates the fixing plate 164 and projects toward the printed circuit board rack 110 with its tip. Then, a mounting plate 166 is fixed to each tip. A vacuum pad 168 and a positioning pin 170 are respectively erected on each mounting plate 166, and both of them are oriented toward the rack. On the other hand, the horizontal shaft 16
2,162 penetrates the movable plate 172 and projects toward the printed circuit board rack 110 with its tip. Then, a mounting plate 174 is similarly fixed to each tip. Similarly, a vacuum pad 178 and a positioning pin 178 are erected on the mounting plate 174, and both of them are oriented toward the rack.

Therefore, when the drive plate 158 moves forward, each horizontal shaft 160, 160, 162, 1
62 also move forward together. At this time, first,
A sensor probe 180 provided on the mounting plate 166 of the lower horizontal shaft 160 contacts the suction plate 70 of the printed circuit board rack 110.

The sensor probe 180 is attached to the mounting plate 166 as shown in FIG.
gives a habit of always moving forward (to the right in the figure). When this sensor probe 180 comes into contact with the suction plate 70 and is pushed in against the biasing spring 182 (moved to the left in the figure), the optical sensor 184 is activated and the stepping motor 144 is switched to low speed rotation. And Bakyumpat 168,1
68, 176, 176 are gently attached to the suction plate 70...
The positioning pins 170, 170, 178, 178 are brought into contact with the suction plates 70... by moving further forward. At this time, the sensor probe 180 is pushed further and another optical sensor 1
86, and the stepping motor 144 is stopped. However, when this state occurs, each vacuum patch 168, 16
8, 176, 176 are sufficiently pressed against the suction plates 70..., and the suction plates 70... are suctioned as a vacuum to firmly hold the movable side plate 56.

Note that the suction plate 7 of the printed circuit board rack 110
0... Each vacuum patch 168, 168, 17
6, 176, first, by pressing the printed circuit board rack 110 against the stop plate 118 and positioning and fixing it, the suction plate 70 on one side,
70 and two vacuum parts 168, 168, and as mentioned above, when the size of the printed circuit board rack 110 is automatically determined by the optical sensor, the determination result is sent to the cylinder (not shown) to the horizontal shaft 162. , 162, etc., as shown by the two-dot chain line in FIG.
6,176.

By the way, the above-mentioned stepping motor 144
The rotation is transmitted to the ball screw shaft 188 shown in FIG. 18 via the flexible coupling 146 and another flexible coupling not shown. A ball screw nut 1 is attached to the ball screw shaft 188.
90 are screwed together, and the ball screw nut 190 is fixed to the driver unit base 192. Therefore, the rotation of the ball screw shaft 188 is transmitted to the driver unit base 192, and the base is connected to the rail 1.
94, 194 to move forward (to the rear left in FIG. 18).

Here, a ball screw shaft 188 having the same pitch as the ball screw shaft 154 shown in FIG. 16 is used. Therefore, the amount of movement of the driver unit base 192 is the same as the amount of movement of the drive plate 158 in FIG. Therefore, the positioning pin 170,
Driver 19 for 170, 178, 178
If the position of 6,196 is determined accurately in advance, vacuum parts 168, 168, 176, 176
When the movable side plate 56 is held by suction, the driver 1
96 and 196 are located at positions corresponding to the fixing screws 84 and 84 of the printed circuit board rack 110.

The drivers 196, 196 are held by driver mounting plates 198, 198, respectively, and are mounted on the mounting base 20.
Attached to 0,200. At this time, each driver mounting plate 198, 198 is attached to the mounting base 200.
On the other hand, the driver moving cylinders 202, 202 allow the driver to slide vertically. Mounting stand 2
00 and 200 are both placed on the driver unit base 192, one is fixed, the other is adjustable in width, and the cylinder 204
It is provided so as to be driven and guided by rails 206 to slide.

Note that the driver mounting plate 198 and the driver moving cylinder 202 are connected as shown in FIG. 19. In other words, the driver moving cylinder 202
is attached to the mounting base 200, and the operating rod 208
hangs downward. A locking pin 210 is fixed to the tip of the operating rod 208.
A locking piece 212 extending from the driver mounting plate 198 is placed on the collar of the driver 10, and the driver mounting plate 198 is latched onto the driver moving cylinder 202. The upper end of the biasing spring 214 disposed around the operating rod 208 is pressed against the mounting base 200, and the lower end is pressed against the locking piece 212. Therefore, fix the driver bits 216, 216 at the tips of both drivers 196, 196 with the fixing screw 8.
4, 84 to loosen their fixing screws, both drivers 196, 196 compress against the biasing springs 214, 214 and escape upward, even though they gradually rise as the fixing screws 84, 84 loosen. This means that you can do it.

Next to the driver mounting plates 198, 198, there is a first
Sensor plates 218, 218 as shown in Figure 8
can be installed. And fixing screws 84, 84
When the driver mounting plates 198, 198 become loose and rise by a certain amount, the sensor plates 218, 218 block light from the optical sensors 220, 220. Optical sensor 2
20 and 220, the driver moving cylinders 202 and 202 are driven, and both drivers 19
6,196 and driver bit 216,2
16 from engagement with fixing screws 84,84. Note that the mounting position of the sensor plate 218 can be moved, and the amount of loosening of the fixing screws 84, 84 can be finely adjusted.

By the way, the driver unit base 1 mentioned above
A length measuring device head 222 is fixed to the side of the length measuring device 92 . The head 222 is connected to the storage width automatic adjustment machine 1.
It faces the length measuring device scale 224 which is fixed at 00. The amount of movement of the driver unit base 192 is digitally displayed on a display unit (not shown).

Therefore, as mentioned above, the vacuum
When the movable side plate 56 is sucked and held by the movable side plates 8, 168, 176, 176, the drivers 196, 196
are the fixing screws 84 of the printed circuit board rack 110,
84 and their driver 1
96, 196 driver bits 216, 216 are engaged with fixing screws 84, 84 and loosened. and,
Raise the driver 196, 196 and disengage the driver bit 216, 216 from the set screw 84, 84.

Thereafter, in order to adjust the storage width to a preset width, the stepping motor 144 is driven to move the movable side plate 56 of the printed circuit board rack 110 to determine the distance between the side plates 52 and 56. In addition, the movable side plate 5
6 is moved, the amount of movement is digitally displayed on the above-mentioned display unit. The amount of movement is also fed back as a signal to the control unit, and it is constantly monitored to see if the movement has been reliably set by the specified amount in relation to the output signal. If they do not match, a correction pulse is automatically sent to the stepping motor 144 to correct the position.

After accurately determining the distance between the side plates 52 and 56, the drivers 196 and 196 are lowered again and the fixing screws 84 and 84 are tightened to fix the adjusted position of the movable side plates 56. Then, the drivers 196, 196 are raised, and the driver bit 21 is raised.
6, 216 and the fixing screws 84, 84 are disengaged. After that, Bakyumupattu 168, 168,
176, 176, release the holding of the movable side plate 56, drive the stepping motor 144, and move the vacuum parts 168, 168, 17.
6,176 will be set back.

After that, the fixation by the fixed cylinders 130, 132 shown in FIGS. 12 and 13 is released, the positioning by the positioning cylinder 122 or 124 is released, the lift rods 120... are further lowered, and finally the stop plate 118 is lowered. Then, the printed circuit board rack 110 is sent out. The delivered rack is conveyed by the roller conveyor device 102 and stops against a stop plate 226 shown in FIGS. 10 and 11. The reference numeral 228 in FIGS. 10 and 11 is a biasing cylinder similar to the reference numeral 116 in FIGS. 108 to perform a positioning operation for entering the next process.

Effects Therefore, according to the storage width automatic adjustment device according to the present invention, the work efficiency is improved by tightening or unfastening the fastening members only from above the rack for printed circuit boards, and also when tightening the fastening members. The storing width of the printed circuit board rack can be automatically adjusted without deforming the movable side plate. Moreover, the storage width can be automatically adjusted by the storage width automatic adjustment device without complicating the structure of the storage width automatic adjustment device.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a conventional printed circuit board rack. FIG. 2 is a longitudinal sectional view of the slide frame portion of the printed circuit board rack. Third
The figure is a plan view illustrating how the movable side plate of the printed circuit board rack warps. FIG. 4 is a perspective view of a printed circuit board rack in the storage width automatic adjustment device according to the present invention. FIG. 5 is an exploded perspective view of the left support frame portion of the rack. FIG. 6 is an exploded perspective view of the right support frame portion of the rack. FIG. 7 is a longitudinal sectional view of the slide frame portion of the rack. FIG. 8 is a partial perspective view of the support rod of the rack. FIG. 9 is a sectional view of the lower end portion of the drop-off prevention rod of the rack. FIG. 10 is a schematic plan view of an automatic storage width adjustment device which is an embodiment of the present invention. 11th
The figure is a schematic front view thereof. FIG. 12 is a schematic perspective view showing the positioning and fixing mechanism of the storage width automatic adjustment device. FIG. 13 is a schematic side view thereof. FIG. 14 is an explanatory diagram showing a mechanism for determining the normal set state of the rack in the storage width automatic adjustment device. FIG. 15 is an explanatory diagram specifically illustrating a method for determining when the device is set abnormally. A shows a case where the device is set upside down, and B shows a case where the device is set upside down. FIG. 16 is a perspective view showing the side plate holding/moving mechanism of the storage width automatic adjustment device. 17th
The figure is a partial sectional view showing a buffer structure provided in the side plate holding/moving mechanism. FIG. 18 is a perspective view showing the driver mechanism of the storage width automatic adjustment device. FIG. 19 is an explanatory diagram showing a driver holding structure in the driver mechanism. 14... Upper plate, 16... Lower plate, 52... Fixed side plate, 56... Movable side plate, 72... Support rod, 84...
... Fixing screw, 102 ... Roller conveyor device, 1
10... Rack for printed circuit board, 126, 128
... Reference plate, 144 ... Stepping motor, 154 ... Ball screw shaft, 156 ... Ball screw nut, 168, 176 ... Vacuum part, 170, 178 ... Positioning pin, 196 ...
…driver.

Claims (1)

[Scope of Claims] 1 A fastening member is tightened to the upper end of a support rod disposed between the upper plate and the lower plate, the upper end of the support rod is fixed to the upper plate, the movable side plate is positioned, and a plurality of fasteners are connected between the movable side plate and the fixed side plate. a rack transport mechanism for transporting a rack for printed circuit boards supporting multi-tiered printed circuit boards to and from the adjustment position; and a rack transport mechanism for transporting the rack to the adjustment position by the rack transport mechanism, and positioning and fixing the rack there. and a side plate holding mechanism that holds the movable side plate of the rack when the rack is positioned and fixed by the positioning and fixing mechanism, and moves the rack to a position where the distance between the movable side plate and the opposing fixed side plate is a predetermined storage width. a moving mechanism; and a tightening/releasing mechanism that, when the movable side plate is held by the side plate holding/moving mechanism, moves together with the side plate holding/moving mechanism to tighten or unfasten the fastening member from above the rack. An automatic storage width adjustment device for a rack for printed circuit boards, comprising a member and the following. 2. The side plate holding/moving mechanism rotates a ball screw shaft by driving a stepping motor, a ball screw nut screwed into the ball screw shaft moves back and forth, and a plate fixed to the ball screw nut moves. Storage of a rack for printed circuit boards according to claim 1, comprising a vacuum pad for suctioning and holding the movable side plate on the plate, and a positioning pin so that the movable side plate can be held at a constant position at all times. Width automatic adjustment device.