JP4141655B2 - Work fixture and printed circuit board processing machine equipped with the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a work attachment for attaching a work on a table when performing drilling or outline processing on a work such as a printed circuit board, and a printed circuit board processing machine provided with the work attachment.
[0002]
[Prior art]
FIG. 7 is a longitudinal sectional view of a part of a table portion in a conventional printed circuit board processing machine.
[0003]
A printed circuit board 1 to be processed is placed on a work placement surface 2 a of a table 2, and is fixed to the table 2 by a claw member 4 and a bolt 5 together with a collar 3 having substantially the same thickness as the printed board 1. The table 2 is provided with a large number of screw holes 2 b so that a plurality of bolts 5 and claw members 4 can be arranged at appropriate positions according to the size of the printed circuit board 1.
[0004]
In order to securely fix the printed circuit board 1 on the table 2, it is necessary to fully screw the bolt 5 into the table 2. At this time, if the bolt 5 is screwed more than necessary, the surface of the printed circuit board 1 will be removed. There is a risk of scratching. For this reason, the printed circuit board 1 is prevented from being damaged by managing the screwing torque of the bolt 5.
[0005]
[Problems to be solved by the invention]
However, the thickness t of the printed circuit board 1 varies depending on the type of the printed circuit board 1. For this reason, the screwing torque of the bolt 5 has to be adjusted for each thickness t of the printed circuit board 1, and there is a problem that management is complicated and workability is low.
[0006]
In the above description, the case where the printed circuit board 1 is fixed to the table 2 has been described as an example. However, the problem that the management is complicated and the workability is low is not limited to this. It is a common problem that tends to occur.
[0007]
Therefore, the present invention eliminates the need for adjusting the screwing torque of the bolt for each workpiece thickness, and facilitates management and improves workability, and a printed circuit board processing machine equipped with the workpiece fixture Is intended to provide.
[0008]
[Means for Solving the Problems]
The present invention according to claim 1 relates to a work fixture for fixing a work placed on a table. The work fixture according to the present invention is arranged so as to be capable of moving up and down relatively with respect to the bolt and the work and the work bolt on the table. A claw member engageable from above, a first urging member interposed between the table and the claw member and urging the claw member upward, and the first urging member A second biasing member that is interposed between the bolt and the claw member and biases the claw member downward with respect to the bolt; and a screw of the bolt against the table member. A screw-in amount regulating member that abuts against the bolt and regulates the screw-in amount of the bolt at the time of screwing in, and increases the screw-in amount of the bolt to increase the screw-in amount of the first and second attachments. The force member is shortened and the claw member is lowered to Is fixed on the table, the first biasing member is mainly shortened until the claw member engages with the work on the table, and the claw member engages with the work on the table. After the lowering is prohibited, the second urging member is shortened and the work is pressed by the claw member until the bolt comes into contact with the screwing amount regulating member.
[0009]
According to a second aspect of the present invention, in the work attachment according to the first aspect, in the state where the bolt is screwed into the table until it abuts on the screwing amount regulating member, the bolt and the claw member The first and second urging members and the regulating member are located below the work placement surface of the table.
[0010]
The present invention according to claim 3 relates to a printed circuit board processing machine comprising a table on which a work is placed, a work attachment for fixing the work on the table, and a processing means for processing the fixed work. Is. The printed circuit board processing machine according to the present invention is characterized in that the workpiece fixture is the workpiece fixture according to claim 1 or 2.
[0011]
[Action]
In the work fixture according to the present invention, the work pressure applied by the claw member changes in accordance with the thickness of the work, so there is no need to manage the screwing torque of the bolt.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on the illustrated embodiments. In addition, although the case where the workpiece | work attached on a table with a workpiece | work fixture is a printed circuit board is demonstrated to an example below, this invention is not limited to this.
[0013]
FIG. 1 is a top view showing a state in which a printed circuit board 1 is mounted on a table 2 using a work fixture according to the present invention. 2 to 5 are longitudinal sectional views of the work fixture. Among these, FIG. 2 shows a state in which the work fixture is housed in the table 2, and FIG. 3 shows a state in which a part of the work fixture is projected on the table 2 prior to the mounting of the printed circuit board 1. FIG. 4 shows a state where the thick printed board 1 is attached, and FIG. 5 shows a state where the thin printed board 1 is attached.
[0014]
As shown in FIG. 2, the work fixture according to the present invention includes a claw member 3, a bolt 5, a nut block 6, a coil spring (first urging member) 8, and a coil spring (second attachment). Force member) 10 and a stopper (screwing amount regulating member) 9.
[0015]
Among these, the bolt 5 is a straight portion having a diameter larger than that of the male screw portion 5a and smaller than that of the flange portion 5b between the male screw portion 5a on the front end side (the lower end side in the drawing) and the flange portion 5b of the head portion. 5c is provided. A hexagonal hole (not shown) is formed in the head. The male screw part 5 a of the bolt 5 is screwed into the female screw part 6 a of the nut block 6.
[0016]
The nut block 6 is fixed to the lower surface of the table 2 via a cylindrical spacer 7. At the center of the upper surface 6c of the nut block 6, a boss portion 6b protrudes upward. The nut block 6 can be regarded as a part of the table 2 together with the spacer 7.
[0017]
The coil spring (compression spring) 8 is placed on the upper surface 6c of the nut block 6 and is loosely fitted to the boss portion 6b. The coil spring 8 is positioned in the radial direction by the boss 6b.
[0018]
The stopper 9 as a screwing amount regulating member is a cylindrical member, is placed on the upper surface 6 d of the boss portion 6 b of the nut block 6 and is loosely fitted to the male screw portion 5 a of the bolt 5. The stopper 9 has an inner diameter larger than that of the male threaded portion 5a of the bolt 5 and an outer diameter smaller than the inner diameter of the cavity 3b of the claw member 3 and coil spring 8 described later, and the axial center of the female threaded portion 6a. Is arranged.
[0019]
The claw member 3 is a bottomed cylindrical member, is fitted into a vertical hole 2c provided in the table 2, and is guided in the hole 2c and is movable in the vertical direction in the figure. A through hole 3a penetrating in the vertical direction is provided in the bottom portion 3d of the claw member 3, and a tongue-like presser portion 3c is provided in the lateral direction on the upper end side.
[0020]
The coil spring (compression spring) 10 is accommodated (arranged) in the cavity 3 b of the claw member 3. On the upper side of the coil spring 10, a spring receiver 11 that is hooked on the flange portion 5b of the bolt 5 is disposed.
[0021]
As shown in FIG. 2, when the bolt 5 is screwed in until the lower end of the straight portion 5c comes into contact with the upper surface 9a of the stopper 9, the positional relationship between the respective portions is as follows.
[0022]
That is, the distance L1 between the lower surface of the bottom 3d of the claw member 3 and the upper surface 6c of the nut block 6 is longer than the total length when the coil spring 8 is fully compressed, and the distance between the lower surface of the presser 3c of the claw member 3 and A slight gap is formed between the bottom surface of the storage portion 2b formed on the table 2 (however, the gap is not shown in the figure), and the upper surfaces of the claw member 3 and the bolt 5 are the table. 2 is placed at a position lower than the workpiece placement surface (upper surface) 2a.
[0023]
Here, the spring constant of the coil spring 10 is set sufficiently larger than the spring constant of the coil spring 8, for example, about 10 to 50 times.
[0024]
As shown in FIG. 4, the distance L2 between the upper surface of the bottom 3d of the cavity 3b and the lower surface of the spring receiver 11 when the printed board 1 having the largest plate thickness t is fixed is such that the coil spring 10 is fully compressed. It is configured to be longer than the total length of the case.
[0025]
Next, the operation of the work fixture having the above-described configuration will be described.
[0026]
From the state of FIG. 2, by inserting a hexagon wrench into the hexagonal hole in the head of the bolt 5 and rotating the bolt 5 in the loosening direction, the coil spring 8 and the coil spring 10 are gradually extended, and the holding portion 3c. Is rotated by approximately 180 degrees, as shown in FIG. 3, the height between the workpiece placement surface 2 a of the table 2 and the lower surface of the pressing portion 3 c of the claw member 3 is higher than the plate thickness t of the printed circuit board 1. To secure a high space. As a result, the printed circuit board 1 can be set on the work placement surface 2 a of the table 2.
[0027]
In order to fix the printed circuit board 1 from the state shown in FIG. 3, the pressing portion 3 c is opposed to the printed circuit board 1 and is rotated in the direction in which the bolt 5 is screwed. Then, the coil springs 8 and 10 are gradually contracted (bent), and accordingly, the claw member 3 is lowered, and the lower surface of the presser portion 3c engages and contacts the surface of the printed circuit board 1.
[0028]
When the printed circuit board 1 is warped, the claw member 3 is further lowered while correcting the warpage of the printed circuit board 1 by the pressing portion 3c, and stops the descent when the correction of the warpage is completed. Thereafter, the coil spring 8 does not contract. When the bolt 5 is further rotated in the screwing direction, the coil spring 10 is gradually contracted. When the bolt 5 is screwed in until the lower end of the straight portion 5c of the bolt 5 comes into contact with the upper surface 9a of the stopper 9, the force of the difference between the amount of contraction of the coil spring 10 and the amount of contraction of the coil spring 8 Then, the printed circuit board 1 is pressurized toward the upper surface 2 a of the table 2.
[0029]
Therefore, when the board thickness t of the printed circuit board 1 is thick, as shown in FIG. 4, the amount of contraction of the coil spring 10 is large and the amount of contraction of the coil spring 8 is small. Pressurize with great force. On the other hand, when the thickness of the printed circuit board 1 is thin, as shown in FIG. 5, the amount of contraction of the coil spring 10 is small and the amount of contraction of the coil spring 8 is large. As a result, the claw member 3 makes the printed circuit board 1 small. Pressurize with force. That is, in any case where the plate thickness t is thick or thin, if the bolt 5 is screwed to the moving end, that is, until the bolt 5 does not move by the stopper 9, the printed circuit board 1 having the respective plate thickness t is loaded. It can be fixed on the table 2 with an appropriate force.
[0030]
In this embodiment, by screwing the bolt 5 in the state shown in FIG. 2, the upper surface of the claw member 3, that is, the upper surface of the holding portion 3c, and the upper surface of the head portion of the bolt 5, that is, the upper surface of the flange portion 5b. Is lower than the workpiece placement surface 2a. Therefore, even if a member for pressing the printed circuit board 1 is incorporated for each nut block 6 in advance, the printed circuit board 1 is placed on the workpiece placement surface 2a of the table 2. There is no hindrance when placing. Therefore, management of the claw member 3 and the like is facilitated, and workability when the printed circuit board 1 is fixed to the table 2 can be improved.
[0031]
Further, the pressing force of the printed circuit board 1 can be changed by appropriately combining the spring constants of the coil spring 8 and the coil spring 10.
[0032]
Note that the bolt 5, the coil springs 8, 10, the spring receiver 11, and the stopper 9 may be prepared as a set and attached to a necessary portion.
[0033]
FIG. 6 shows another embodiment. In the above-described embodiment, the stopper 9 is provided separately from the bolt 5, but as shown in the figure, the straight portion 5 c of the bolt 5 is made longer so that the straight portion 5 c also serves as a stopper. You can also. In this case, since it is not necessary to provide a stopper, the configuration can be simplified accordingly.
[0034]
The spring receiver 11 may be fixed to the bolt 5 integrally.
[0035]
The printed circuit board processing machine according to the present invention processes the above-described workpiece attachment tool, the table 2, and the printed circuit board 1 attached to the workpiece placement surface 2a of the table 2 by the workpiece attachment tool, for example, drilling, outer shape processing. Processing means. According to this printed circuit board processing machine, the time required for mounting the printed circuit board 1 on the table 2, that is, the so-called setup time can be greatly shortened, and the thickness of the printed circuit board 1 can be increased on the work placement surface 2a of the table 2. Regardless of the size, it can be attached with an appropriate force, so that there is no possibility of damaging the surface of the printed circuit board 1 or shifting the printed circuit board during processing.
[0036]
【The invention's effect】
As described above, according to the present invention, the work can be attached by pressing the work piece onto the table with an appropriate force by the claw member by screwing the bolt to the moving end. As a result, even if the plate thickness of the workpiece changes, there is no need to adjust the screwing torque of the bolt, and workability can be improved.
[Brief description of the drawings]
FIG. 1 is a top view showing a state in which a printed circuit board 1 is mounted on a table 2 using a work mounting tool according to the present invention.
FIG. 2 is a longitudinal sectional view showing a state in which a work fixture is housed in a table.
FIG. 3 is a longitudinal sectional view showing a state in which a part of the work fixture is protruded on the table prior to the mounting of the printed circuit board.
FIG. 4 is a longitudinal sectional view showing a state in which a thick printed board is mounted on a table.
FIG. 5 is a longitudinal sectional view showing a state where a thin printed board is mounted on a table.
FIG. 6 is a view corresponding to FIG. 4, showing another embodiment.
FIG. 7 is a longitudinal sectional view for explaining a conventional example.
[Explanation of symbols]
1 Workpiece (printed circuit board)
2 Table 2a Workpiece mounting surface 3 Claw member 5 Bolt 8 First biasing member (coil spring)
9 Screwing amount regulating member (stopper)
10 Second urging member (coil spring)

Claims (3)

In the work fixture for fixing the work placed on the table,
A bolt screwed into the table from above;
A claw member that is disposed so as to be able to move up and down relatively with respect to the workpiece and the bolt, and that can be engaged with the workpiece on the table from above,
A first urging member interposed between the table and the claw member to urge the claw member upward;
A second urging member having a stronger spring force than the first urging member and interposed between the bolt and the claw member to urge the claw member downward with respect to the bolt;
A screwing amount regulating member that abuts against the bolt when the bolt is screwed into the table member and regulates the screwing amount of the bolt; and
When shortening the first and second urging members by increasing the screwing amount of the bolt and fixing the work on the table by lowering the claw member,
Until the claw member engages with the work on the table, the first biasing member is mainly shortened, and after the claw member engages with the work on the table and the lowering is prohibited, The second urging member is shortened and pressurizes the work by the claw member until the bolt comes into contact with the screwing amount regulating member;
A workpiece fixture characterized by that. In a state where the bolt is screwed into the table until it comes into contact with the screwing amount regulating member, the bolt, the claw member, the first and second urging members, and the regulating member are workpieces on the table. Located below the mounting surface,
The work fixture according to claim 1. In a printed circuit board processing machine comprising a table on which a work is placed, a work attachment for fixing the work on the table, and a processing means for processing the work in a fixed state,
The workpiece fixture is the workpiece fixture according to claim 1 or 2,
A printed circuit board processing machine.

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