JPH03146881A - Loading/unloading structure for holding frame of printed board - Google Patents

Abstract

PURPOSE:To simplify mounting work process by driving an industrial robot or an automatic mounting machine by inserting a round shaft part to a receiving hole by inserting and feeding a thin thickness shaft part in an axial direction, and inserting and loading a holding frame to a board receiver. CONSTITUTION:Structure to load/unload a second holding frame 10 on the board receiver of board mounting equipment is formed by providing a pair of frame turning shafts 12a, 12b comprised by providing the thin thickness shaft parts 14b with cross-section almost in elliptical or rectangular shape protruded from both right and left sides of the holding frame 10 and the round shaft part 14a with cross-section in circular shape in parallel, and the board receiver provided with a right and left pair of insertion ports having an aperture diameter corresponding to th thickness size of each thin thickness shaft part 14b at a pair of frame turning shafts 12a, 12b, and hole diameter corresponding to the diameter size of the round shaft part 14a formed at the inside depth of the insertion port. The round shaft part 14a is inserted to the receiving hole 38b by inserting and feeding the thin thickness shaft part 14b in the axial direction, and the holding frame 10 is inserted to the board receiver. Thereby, it is possible to simplify a process to mount the board on targeted equipment via the holding frame.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a frame body that supports and protects a printed circuit board on which electronic and electric elements forming a control circuit and a drive circuit are mounted. Regarding the structure that allows the holding frame to be easily and automatically mounted together with the printed circuit board to a board holder such as a casing of the target device using automatic mounting means, such as an industrial robot, in particular, the control of the spindle drive motor. and a spindle amplifier forming a drive device, for example, an AC spindle amplifier disclosed in Japanese Patent Application No. 148012/1989 by the present applicant, and the above-mentioned printed circuit board holding frame is attached to the board holder of the housing. The present invention also relates to a structure for attaching and detaching a holding frame for a printed circuit board, which can be easily detached if necessary. More specifically, the present invention particularly aims at preventing the holding frame from falling off from the board holder when the printed circuit board is pulled out from the board holder together with the holding frame to the maintenance work position (3) during maintenance of the printed circuit board. The present invention relates to an improved attachment/detachment structure for a holding frame for a printed circuit board.

[Prior art]

In the spindle amplifier, a printed circuit board on which electronic and electric elements forming a control circuit and a drive circuit are mounted is attached to the upper part of the amplifier housing via a holding frame. Conventional printed circuit boards have a structure in which a control circuit system and a drive circuit system are mounted as one on a single board.
In recent years, with improvements in functionality required for spindle motors, the mounting density on the board has also increased, so the control circuit system and drive circuit system are separated into separate printed circuit boards and mounted on the top of the amplifier housing. There is a trend towards a structure in which both of these boards are mounted in multiple stages. That is, for example, a printed circuit board for a drive circuit system is mounted on the upper stage of a high-power wiring board attached to the ceiling of an amplifier housing with an appropriate gap, and then a printed circuit board for a drive circuit system is mounted on the upper stage of a printed circuit board for the drive circuit system at an appropriate interval. A mounting structure will be adopted in which the printed circuit board (A) for the control circuit system will be mounted with the space left open.

[Problem to be solved by the invention]

When such a multi-stage mounting structure of a printed circuit board is adopted, the following problems arise. In other words, when performing maintenance on a spindle amplifier to check the circuit function on the lower printed circuit board located below the upper printed circuit board, the upper printed circuit board is rotated and the top surface of the lower printed circuit board is lifted up. The method is to expose the surface and perform an electrical check via a check pin previously placed at a suitable location on the surface.

However, conventionally, holding frames for printed circuit boards have been formed as sheet metal frame members made of aluminum, and in order to realize the above-mentioned rotating flip-up structure using this aluminum holding frame, it is necessary to It is fastened and fixed by a set screw protruding from the side of the amplifier housing, and by rotating around the screw, the holding frame for the upper printed circuit board is lifted up, exposing the lower printed circuit board surface.

However, with this structure, when attaching each printed circuit board to the amplifier housing via the holding frame, it is necessary to insert a set screw from the side of the amplifier housing. Attaching the printed circuit board to the spindle amplifier on-site using automatic mounting means such as industrial robots is extremely cumbersome, and there are problems such as complicating robot operation programs and various other problems. , has become a problem to be solved. In addition, it is necessary to adopt a structure and design that allows the upper board to be easily flipped up during maintenance, and also to prevent the printed circuit board holding frame from unintentionally falling off from the housing when the upper board is flipped up. These problems are not limited to spindle amplifiers, but similar problems occur in various target devices. In other words, in order to realize automatic mounting of printed circuit boards using an industrial robot, it is necessary to apply a motion program as simple as possible, such as vertical motion to the end effector of the robot, and also For maintenance purposes, it is necessary that the printed circuit board be designed and formed so that it will not easily fall off when an operator flips it up.

Therefore, an object of the present invention is to simplify the work process of mounting a printed circuit board on a target device such as a spindle amplifier via a holding frame, and particularly to make full use of industrial robots, automatic mounting machines, etc. as automatic mounting means. It is an object of the present invention to provide a structure for attaching and detaching a holding frame for a printed circuit board, which can be easily mounted.

Furthermore, another object of the present invention is to easily flip up the upper printed circuit board in a rotary manner for maintenance or the like.
It is possible to adopt a work process that allows checking of the printed circuit board on the lower side, and the structure has been improved to prevent the printed circuit board from falling off at the rotating part when the printed circuit board is flipped up in a rotary manner during maintenance. It is an object of the present invention to provide a structure for attaching and detaching a holding frame for a printed circuit board.

('/) [Means for Solving the Problems] According to the present invention, in a structure in which a holding frame supporting a printed circuit board on which electronic components or the like is mounted is attached to and detached from a board holder of a printed circuit board mounting device, A pair of frame rotating shafts are formed by juxtaposing a thin shaft portion having a generally elliptical or rectangular cross section and a round shaft portion having a circular cross section, which protrude from both left and right ends of the frame; an insertion port having an opening diameter corresponding to the wall thickness of each thin-walled shaft portion of the moving shaft; and a receiving hole formed at the inner depth of the insertion port and having a hole diameter corresponding to the diameter dimension of the round shaft portion. and the board holder having a pair of left and right board holders, the round shaft part is inserted into the receiving hole by inserting the thin shaft part and feeding in the axial direction, and the holding frame is inserted into the board holder. There is provided a structure for attaching and detaching a holding frame for a printed circuit board, and preferably, the holding frame with the elliptical shaft protruding is formed as an integrally molded member of a plastic material.

(Q) [Operation] According to the above-mentioned solution, a pair of frame rotation shafts are provided in the holding frame of the printed circuit board, and the thin part of each rotation shaft is inserted into the receiving hole of the board holder, and after insertion, Since the round shaft part is fixed in the receiving hole by feeding it in the axial direction, the round shaft part will not come off from the receiving hole just by rotating and lifting up the holding frame of the printed circuit board during maintenance. This prevents the retainer from falling off. Moreover, the insertion of the thin-walled shaft part and the shaft feeding operation described above are
This can be achieved by an automatic mounting operation using a combination of simple movements such as up and down operations, lateral movement operations, and rotation operations using automatic mounting means such as industrial robots. Hereinafter, the present invention will be explained in more detail based on embodiments shown in the accompanying drawings.

〔Example〕

FIG. 1 is an exploded perspective view showing an example in which a printed circuit board holding frame according to an embodiment of the present invention is attached to a board holder in an AC spindle amplifier used for controlling and driving a spindle motor for driving the main shaft of a machine tool; Figure 2 (A
), (B) is a plan view and one side view of the board holder,
FIGS. 3(A) and 3(B) are a plan view and a side view as seen from one side, showing the configuration of a holding frame for a printed circuit board according to an embodiment of the present invention, and FIGS. 4(A) and 4(B) are is a schematic diagram illustrating the process of inserting the frame rotation shaft of the printed circuit board holding frame into the receiving hole of the circuit board holder, Fig. 5 (^)
, (B) are side views taken along the V-■ arrow line in FIGS. 4(A) and 4(B).

In the embodiment shown in FIG. 1, a configuration is shown in which a structure for attaching and detaching a holding frame for a printed circuit board according to the present invention is provided on the ceiling of an AC spindle amplifier, and a housing 44 of the AC spindle amplifier is provided inside. Various units forming an amplifier are built in, and a wiring board 42 is attached to the ceiling. This wiring board 42 is a board element equipped with strong electric wiring such as power supply wiring to a spindle motor (not shown), and is mounted on a suitable support means such as a support bracket provided on the casing 44 with screws, etc. fixed by means of fixing means.

This fixing operation is performed by automatic mounting means (not shown) such as an industrial robot.

On the other hand, on the upper stage of the wiring board 42, a first holding frame 40 that protects and supports a printed circuit board constituting the drive circuit system of the spindle motor is mounted on the top of the support post 46 of the casing 44. It is fixed together with the substrate receiving support member 30 having such a structure using appropriate fixing means such as a set screw.

Although not shown, the above-mentioned printed circuit board constituting the drive circuit system is equipped with printed wiring that forms the motor drive circuit, and is also equipped with electric and electronic elements of the drive circuit elements connected to the printed wiring. There is. The first holding frame 40 carrying the printed circuit board of this drive circuit system is also automatically mounted from above the housing 44 of the AC spindle amplifier using an industrial robot in the same way as the above-mentioned wiring board 42, and the setscrews are installed as described above. Screw hole 4 provided at the top of support post 46
It is fixed to the top by screwing into 6a. At this time, the support support member 30 is also screwed onto the top (11) of the support post 46 using the setscrew. This support support 30 has a box-like shape and is provided as a board holder for receiving the second holding frame 10 according to the present invention, which protects and supports a printed circuit board for a control circuit system mounted on the upper side thereof. In the case of a rectangular box structure as in the embodiment, it is made of a plastic molded body with metal fittings 32 attached to the bottom side of approximately the four corners, and the second holding frame 10 is attached to the top side. A receiving hole member 34 that receives the frame rotation shaft 12 and a support protrusion 3
6. Here, the receiving hole member 34 is
Although it may be formed integrally with the plastic molded body of the support support 30 described above by a molding process, in consideration of strength, it may be manufactured separately as a receiving hole metal fitting and fixed at a required position of the support support 30. Also good. The support protrusion 36 is a support part provided for horizontally mounting the second holding frame 10 supporting the printed circuit board of the control circuit system,
A structure that supports the holding frame 10 from below and the frame 1
It is formed in accordance with appropriate design specifications such as a structure that is fixed by engaging with a hole formed in the second (12) holding frame 10, and may be omitted depending on the shape of the corner of the second (12) holding frame 10. In addition, the support support 30 is shown in FIG. 2(A), (
B). Note that a screw receiver 35 having a female threaded hole for screwing the holding frame 10 is also formed in the support support 30 as necessary.

Now, the second holding frame 10 carrying the printed circuit board of the control circuit system is formed as a plate-shaped plastic molded member, and has a rectangular shape shown in FIG. It is attached and mounted on the receiving support 30. As a characteristic structure of the second holding frame 10, a pair of frame rotation shafts 12a and 12b are provided near the corners of the left and right sides 10a and 10b that face each other in the left-right or lateral direction. The two rotating shafts 12a, 12b are formed into different shapes from each other as described later.
2b have a common structure in that they both have a shaft shape in which two parts each having two different cross-sectional shapes are arranged side by side.

Next, we will move on to the configuration of the second holding frame 10, as shown in Figure 3 (^
) and (B).

In FIGS. 3(A) and 3(B), the second holding frame 10 supporting the printed circuit board of the control circuit system (inside the rectangular area indicated by the dotted line in the figure) has a rectangular shape and supports the printed circuit board. When not mounted, it is formed as a plastic molded product with a hollow space inside and a certain frame structure. It has frame rotation shafts 12a and 12b that protrude laterally from the three left and right sides 10a and 10b, and has frame rotation shafts 12a and 12b that protrude laterally from the three left and right sides 10a and 10b. An insertion hole 14 is formed into which a set screw is inserted. 16 is an eyelet for fixing the printed circuit board.

Now, the frame rotation shaft 12a protruding from the left side 10a of the second holding frame 10 is formed with a short appropriate length as a round shaft part 14a whose shaft part near the side side 10a has a circular cross section. It is composed of two shaft parts, in which a thin shaft part 14b having a rectangular or elliptical cross section and having an appropriate length is provided on the tip side of the shaft part 14a by cutting off two sides of the round shaft part to make the shaft thinner. Thin shaft portion 14b with elliptical cross section
The major axis of the ellipse is formed to be equal to the diameter of the circular cross section of the round shaft portion 14a.

On the other hand, the frame rotation shaft 12b protrudes from the right side 10b.
is formed as a thin shaft portion 16b whose portion near the side 10b has the same cross-sectional shape as the thin shaft portion 14b, that is, a rectangular or elliptical cross section, and from the tip of the thin shaft portion 16b. The tip is formed as a round shaft portion 16a having a circular cross section similar to the round shaft portion 14a.

Moreover, a disk-shaped stopper portion 16c having a diameter larger than the diameter of the round shaft portion 16a is formed at the leading end of the frame rotation shaft 12b.

In the frame rotation shafts 12a, 12b, the thin shaft portions 14b, 16b are formed parallel to the frame surface, and the receiving hole member 34 of the support member 30 is opened upward in FIG. This thin shaft portion 14b,
It is formed to be inserted from 16b.

(15) Next, a process of inserting the second holding frame 10 having the above-mentioned frame rotation shafts 12a and 12b on the left and right sides into the support support 30 without the board holder will be described.

Referring to FIGS. 4 and 5, the left and right frame rotation shafts 12a, 12b of the second holding frame 1O are swollen, and the respective thin shaft portions 14b, 16b are previously supported so that the receiving hole member 34 of the support member 30 is directed upward. Since the thin shaft portion 14b is designed and machined in a dimensional relationship facing the opening 38a, the thin shaft portion 14b is viewed from above the opening 38a.

16b and insert it. Here, the opening 38a
are both formed as a shaft insertion opening having a width dimension "t+α" slightly larger than the thickness dimension "t" of the thin shaft portions 14b, 16b of the frame rotation shafts 12a, 12b,
The rotation shafts 12a, 1 are located on the inner back side below this opening 38a.
A receiving hole 38b has an inner diameter of "S+α" which is slightly larger than the diameter "S" of the round shaft portions 14a and 16a of 2b.
is formed. Therefore, the second holding frame 10 is erected perpendicularly to the support support 30, and the thin shaft portions 14b of the frame rotation shafts 12a, 12b (16) are
16b is inserted so as to pass through the corresponding openings 38a in both receiving hole members 34 of the supporting support 30 (the fourth
Figure (state of ＾〉), when the frame is fixed in the receiving hole 38b and the frame rotating shaft 12aS12b is slid to the left in this embodiment after fixing, the thin shaft portion 14b,
16b is pulled out of both receiving holes 38b in the axial direction, and the round shaft portions 14a, 16a are fitted into both receiving holes 38b instead. Here, both frame rotation shafts 12a.

The sliding movement of the shaft 12b is continued until the stopper 16c of the right rotation shaft 12b comes into contact with the end surface of the receiving hole member 34. In this way, the second holding frame 10 is supported by rotating the round shaft portions 14a, 16a of the frame rotation shafts 12a, 12b within the receiving holes 38b, 38b with respect to the support support 30, thereby supporting the support support 30. can be fixed in a substantially horizontal state on a plane. In this way, the holding frame 10 has round shaft portions 14a116 of the frame rotation shafts 12a, 12b.
a is the receiving hole 38b of the receiving hole member 34 of the support support 30;
Since it is engaged with, it is stably fixed and held.

Thereafter, the second holding frame 10 can be immovably fixed to the upper surface of the support support 30 with a set screw (not shown) through the above-described set screw insertion hole 14 of the second holding frame 10.

Here, it should be noted that the process of attaching and mounting the second holding frame 10 to the support support 30 is as follows:
This is a simple operation consisting of an operation of holding the second holding frame 10 from above the support sabot 30 and dropping it into the receiving hole member 34 for the frame rotation shafts 12a, 12b, and sliding and rotating it within the receiving hole 38b. , these operations can be easily performed even if the hand of an industrial robot or the like is used as an automatic mounting means. In other words, a simple operating program can operate an industrial robot to automatically mount the second holding frame 10 on the board receiving port 30.

Furthermore, the rotation shaft 12a of the second holding frame 10 mentioned above,
By reversing the insertion process using 12b, it is possible to easily remove the second holding frame 10 from the supporting support 30. Moreover, it is worth noting that the round shaft portions 14a, 16a are simply inserted into the receiving hole 38b of the receiving hole member 34 without applying a sliding action opposite to that at the time of insertion to both frame rotation shafts 12a, 12b. If you rotate the
The holding frame 10 can be rotated upward from the horizontal position fixed on the support sabot 30 and raised, thus allowing the AC spindle amplifier 44 shown in FIG.
, the second holding frame 1 is removed during maintenance, etc.
When carrying out an electrical check of the printed circuit board of the drive circuit system supported on the first holding frame 40 attached to the lower part of the
Retaining frame l.

can be raised by rotating to expose the lower printed circuit board. Therefore, not only can the maintenance work itself be carried out extremely easily, but also the second
The holding frame 1o has both receiving hole members 3 of the support support 30.
A departure from 4 (19) will never occur. Therefore, there is no fear of damage to the printed circuit board, mounted electronics, electrical elements, damage to wiring, etc. caused by detachment.

The present invention has been described above based on an example in which the present invention is implemented in a holding frame for a printed circuit board attached to the ceiling of a box-shaped housing of an AC spindle amplifier. It is obvious that the holding frame attachment/detachment structure of the present invention can be applied to electronic devices as target equipment. Further, in the above-described embodiment, the stopper 16c was provided on the right frame rotation shaft 12b, but this was reversed and the left frame rotation shaft 12a was provided with the stopper 16c.
It goes without saying that if a configuration in which a stopper is provided on the side is convenient for automatic mounting, it is sufficient to form an embodiment having such a configuration, and that this embodiment is also within the scope of the present invention. be.

〔Effect of the invention〕

According to the present invention, when mounting a printed circuit board on a target device via the holding frame (20), the printed circuit board can be mounted on the target device by simply inserting the circuit board into the receiving hole from above and rotating the circuit board after insertion. Because it can be fixed on equipment, printed circuit board mounting can be accomplished in a simple procedure using automatic mounting means such as industrial robots and special automatic mounting machines.Moreover, the mounted printed circuit board can be maintained easily.
For inspection and maintenance, the upper printed circuit board can be rotated to expose the lower printed circuit board, and the electrical and electronic elements on the lower printed circuit board can be easily inspected and maintained. Can be done. Moreover, there is no fear of an unexpected situation in which the printed circuit board holding frame comes off when it is flipped up, and maintenance work can be carried out safely.

In particular, the holding frame does not fall off not only when the printed circuit board is installed horizontally in the target device as described above, but also when it is installed vertically, making it ideal for maintenance work. performance is greatly improved.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing an example in which a printed circuit board holding frame according to an embodiment of the present invention is attached to a board holder in an AC spindle amplifier used for controlling and driving a spindle motor for driving the main shaft of a machine tool; Figure 2 (A
), (B) is a plan view and one side view of the board holder,
FIGS. 3(A) and 3(B) are a plan view and a side view as seen from one side, showing the configuration of a holding frame for a printed circuit board according to an embodiment of the present invention, and FIGS. 4(A) and 4(B) are FIG. 5A is a schematic diagram illustrating the process of inserting the frame rotation shaft of the printed circuit board holding frame into the receiving hole of the board holder.
, (B) is a side view taken along the line of arrows ■-■ in FIGS. 4(A) and (B). 0 2 0 4 8 Second holding frame for printed circuit board, b... Frame rotation axis, support support, receiving hole member, opening, 38b... Receiving hole, 40... First holding frame, 44... AC spindle amplifier

Claims (1)

[Scope of Claims] 1. In a structure in which a holding frame carrying a printed circuit board on which electronic components, etc. are mounted, is attached to and removed from a board holder of a printed circuit board mounting device, a cross section protruding from both left and right ends of the holding frame is shown. A pair of frame rotation shafts formed by arranging a thin shaft portion of an elliptical or rectangular shape and a round shaft portion of a circular cross section, and a wall thickness dimension of each thin shaft portion of the pair of frame rotation shafts. and a receiving hole having a hole diameter corresponding to the diameter of the round shaft portion formed in the inner depth of the insertion port, the board holder having a pair on the left and right. A printed circuit board, characterized in that the round shaft part is inserted into the receiving hole by inserting the thin shaft part and feeding in the axial direction, and the holding frame is inserted into the board receiver. Removable structure for the holding frame. 2. When the frame rotating shaft protruding from the left end of the holding frame has the thin wall portion adjacent to the outside of the round shaft portion, the frame rotating shaft protruding from the right end of the holding frame has the thin wall portion adjacent to the outside of the round shaft portion; Claim 1: The thin wall portion is adjacent to the inside of the round shaft, and a stopper larger than the diameter of the round shaft is provided on the outside of the round shaft of the frame rotation shaft protruding from the right end of the holding frame. The attachment/detachment structure of the printed circuit board holding frame described in . 3. The attachment/detachment structure for a holding frame for a printed circuit board according to claim 1, wherein when the thin portion has an elliptical cross-sectional shape, the major axis of the ellipse is equal to the diameter of the round shaft portion arranged in parallel. 4. The openings of the left and right insertion ports of the board holder are formed upward, and the receiving holes are formed in the lower part of the insertion ports, so that the printed circuit board holding frame has the pair of frame rotation shafts. 2. The structure for attaching and detaching a holding frame for a printed circuit board according to claim 1, wherein the holding frame is configured to be detachably attached to the board holder of the mounted device from above.