JPH04354609A - Printed wiring board hold-down device - Google Patents

Abstract

PURPOSE:To provide hold-down pieces capable of holding down a printed wiring board near the bank of a machining hole even when using a tool small in diameter and which can choose each hold-down piece automatically. CONSTITUTION:A printed wiring board 6 mounted on a table 10 is fitted to a printed wiring board finishing device which machines the board 6 with a tool 2 held by a spindle 1. A hold-down member 13A is fitted in the direction in which the tool 2 travels, and has a through hole 13B through which the tool 2 with a maximum diameter can pass. On the under surface of the member 13A, a sliding groove 13C is formed at right angles to the axial direction of the spindle 1. A slide member 7A sliding along the sliding groove 13C and a sliding structure 8 sliding the member 7A are installed, and a plurality of hold-down pieces 7B, 7C different in hole diameter from the member 7A are fixedly installed in an unillustrated control device which chooses the hold-down piece 7B or 7C responding to a tool exchange command.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a printed circuit board holding mechanism installed in a printed circuit board processing machine, and particularly to a printed circuit board holding mechanism suitable for improving the holding efficiency of a printed circuit board depending on the size of a hole to be processed. The present invention relates to a substrate holding device.

0002

2. Description of the Related Art As shown in FIG. 9, a conventional printed circuit board processing machine has a table 10 on which a printed circuit board 6 is placed and fixed, and a table 10 that moves in the The spindle 1 is movably supported and holds a drill 2 at one end. The printed circuit board holding device in such a printed circuit board processing machine includes a pair of cylinders 5 supported by a saddle 20 and a pressure foot 3 supported by the cylinders 5. The cylinder 5 urges the pressure foot 3 toward the table 10 with a predetermined pressure.

During drilling, when the saddle 20 is lowered, the pressure foot 3 first comes into contact with the printed circuit board 6. When the saddle 20 further descends, the cylinder 5 supporting the pressure foot 3 is compressed, a pressing force acts on the pressure foot 3, and the printed circuit board 6 is pressed against the table 10. When the saddle 20 is further lowered, the drill 2 is pushed into the printed circuit board 6, as shown in FIG.
Hole drilling is performed. The holes made in the printed circuit board 6 have various sizes from a maximum diameter of 6.3 mm to a minimum diameter of 0.1 mm. Therefore, the through hole 3B at the tip of the pressure foot 3 has a diameter of 8 m so that the maximum diameter drill 2 can pass through.
The size is about m.

0004

[Problems to be Solved by the Invention] In the conventional printed circuit board holding device, as shown in FIG.
When drilling a hole of 0.85 mm from the edge of the hole, as shown in Figure 10,
．． When drilling a 3mm hole, 3.85m from the edge of the hole.
This results in a situation in which a sufficient pressing effect cannot be obtained because the pressing is performed at a distance of m.

An object of the present invention is to provide a printed circuit board that has presser pieces that can press the printed circuit board near the edge of the hole to be machined even when using a small-diameter tool, and that can automatically select each presser piece. An object of the present invention is to provide a substrate holding device.

[0006]

[Means for Solving the Problems] In order to achieve the above object, a printed circuit board holding device according to the present invention is provided in a printed circuit board processing machine that processes a printed circuit board placed on a table using a tool held at the tip of a spindle. In a printed circuit board holding device that is attached to a presser member that contacts the printed circuit board and presses the printed circuit board during processing before the tool passes through the through hole and contacts the printed circuit board, the presser member has a The sliding grooves are formed perpendicularly to each other, and a sliding member that slidably engages with the sliding groove and a sliding mechanism that slides the sliding member are provided, and through holes with different diameters are formed in the sliding member. A plurality of perforated presser pieces are fixedly installed, and a control device is provided to select one of the presser pieces and drive a sliding mechanism in response to a tool exchange command.

[0007]The printed circuit board processing machine is attached to a printed circuit board processing machine that processes a printed circuit board placed on a table using a tool held at the tip of a spindle. , a printed circuit board holding device equipped with a holding member that presses a printed circuit board being processed, in which an inclined surface forming a predetermined angle with the axial direction of a spindle is formed on the holding member, and a rotating member that rotatably slides on the inclined surface. and a rotation mechanism that rotates the rotating member, and a plurality of presser pieces each having through holes of different diameters are fixedly installed on the circumference of the rotating member, and each presser piece is rotated in response to a tool change command. The configuration may include a control device that selects any one of the pieces and drives the rotation mechanism.

[0008]

[Operation] According to the printed circuit board holding device of the present invention, the holding piece corresponding to the diameter of the tool is set in advance, and the control device that receives the exchange command and recognizes the designated diameter of the tool moves the sliding mechanism. is driven to slide the slide member, and one of the presser pieces corresponding to the diameter of the tool is selected and placed directly below the tool. The slide member is lowered via the holding member, and the vicinity of the edge of the hole to be machined is held down by the holding piece before the tool that has passed through the through hole of the holding piece comes into contact with the printed circuit board.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 3. As shown in FIGS. 1 to 3, the spindle 1 is supported by a saddle (not shown) so as to be movable in the Z direction. A shaft (not shown) is rotatably supported at the axis of the spindle 1, and is rotationally driven by a motor (not shown). The collet chuck 1A is supported by a shaft so that it can be opened and closed. The drill 2 is detachably held by the collet chuck 1A. The piston rod 4 protrudes from a cylinder (not shown) supported by the saddle and is biased downward. The pressure foot 13A is slidably fitted to the tip of the spindle 1 and supported by the piston rod 4. A through hole 13B through which the drill 2 passes is formed at the bottom axis of the pressure foot 13A, and a groove 1 is formed at the lower end of the outer peripheral surface.
3C is formed. One end of the cylinder 8 is fixed to the pressure foot 13A. Slide piece 7A
is slidably fitted into the dovetail groove 13C and coupled to the other end of the cylinder 8. This slide piece 7A includes a presser piece 7B having a through hole with a diameter of 8 mm, and a presser piece 7B with a through hole of 1 mm in diameter.
A presser piece 7C having a through hole of mm in diameter is formed. The table 10 is configured to be movable in the X-axis direction, and the printed circuit board 6 is placed and fixed on the table 10.

The operation of this embodiment will be explained with reference to FIGS. 1 and 2. When drilling holes with the drill 2 with a diameter of 6.3 mm, the presser piece 7B is attached to the pressure foot 13A.
The printed circuit board 6 is moved under the hole 13B, and the printed circuit board 6 is drilled. In addition, when drilling a hole with the drill 2 having a diameter of 0.3 mm, as shown in FIG.
The printed circuit board 6 is moved to a position below B, and holes are punched in the printed circuit board 6.

[0011] Then, when drilling a hole with a diameter of 6.3 mm, the hole is pressed 0.85 mm from the edge of the hole, and when drilling a hole with a diameter of 0.3 mm, the hole is pressed 0.35 mm from the edge of the hole. The hole can be drilled by holding down the part. By pressing near the edge of the hole to be machined in this way, it is possible to prevent the printed circuit board from lifting up due to the lead of the drill 2 during drilling, and to prevent warping or cutting chips from occurring between the printed circuit boards. It is possible to prevent damage to the printed circuit board caused by pressing chips.

Note that the holding pieces 7B and 7C are not limited to two types, and pieces of other sizes may also be provided. Further, the slide piece 7A may be moved by using the control device of the printed circuit board processing machine and selecting the holding pieces 7B and 7C in accordance with the diameter of the tool specified by the tool exchange command.

According to this embodiment, since the holding piece can be selected in accordance with the diameter of the tool, the printed circuit board can be held in the vicinity of the edge of the hole. As shown in FIGS. 1 and 2, if there is a risk that another holding piece may come into contact with the edge of the printed circuit board or the protrusion of the stack pin 16, for example, widen the interval between the holding pieces and It is necessary to provide a slide piece avoiding the position of the stack pin.

Next, another embodiment of the present invention is shown in FIGS. 4 and 5.
A configuration different from one embodiment will be explained with reference to . The pressure foot 23A has a through hole 23B with a diameter larger than 8 mm formed therein, and an inclined surface 23C forming a predetermined angle θ with respect to the axial direction of the spindle 1 on the lower surface. and a rotating member 9A that rotatably slides on the inclined surface 23C;
Rotating bearing 1 provided at the central protrusion of rotating member 9A
A rotation mechanism for rotating the rotating member 9A around the rotating member 5 is provided, and a presser piece 9B having a through hole with a diameter of 8 mm bored in the axial direction of the drill 2 on the circumference of the rotating member 9A, and a holding piece 9B with a diameter of 1 mm. A presser piece 9C having a through hole and presser pieces 9D and 9E having diameters intermediate therebetween are fixedly provided. Note that the rotating mechanism includes, for example, a gear 10 formed on the outer periphery of the rotating member 9A, a pinion 11 meshing with the gear 10,
It consists of a motor 12 and an encoder 13 that are directly connected in the axial direction of the pinion 11 and rotate the rotating member 9A at an arbitrary angle via the pinion 11, and a bracket 14 that fixes the motor 12 to the piece 23A.

Further, another embodiment of the present invention will be described with reference to FIG. In order to simplify the rotation mechanism, one part of the lower surface of the rotating member 17A is rotatably connected to one end of the air cylinder 18 provided substantially parallel to the inclined surface. By operating the air cylinder 18, the rotating member 17A is rotated, and for example, the holding piece 17C of the section A shown in FIG. 7 or the section B shown in FIG. It can be located directly below.

According to these other embodiments, the presser piece provided on the rotating member can be selected and moved to a predetermined position. The same effects as in the first embodiment can be obtained.

[0017]

According to the printed circuit board holding device of the present invention, even when using a small diameter tool, the holding piece is automatically selected according to the tool diameter, and the printed circuit board is held near the edge of the hole to be machined. This can suppress the printed circuit board from lifting up during processing and prevent damage to the printed circuit board.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is a diagram illustrating the operation of this embodiment.

FIG. 3 is a diagram illustrating the operation of this embodiment.

FIG. 4 is a longitudinal sectional view showing another embodiment of the present invention.

FIG. 5 is a plan view of FIG. 4;

FIG. 6 is a side view showing another embodiment of the present invention.

FIG. 7 is a diagram illustrating the operation of another embodiment.

FIG. 8 is a diagram illustrating the operation of another embodiment.

FIG. 9 is a vertical cross-sectional view showing a conventional technique.

FIG. 10 is a vertical cross-sectional view illustrating a conventional technique.

[Explanation of symbols]

1 Spindle 2 Drill (tool) 6 Printed circuit board 7A Slide piece (sliding member) 7B Holding piece 7C Holding piece 8 Cylinder (sliding mechanism) 10 Table 13A Pressure foot (holding member) 13B Through hole 13C Dovetail groove (sliding groove)

Claims (2)

[Claims] [Claim 1] A printed circuit board placed on a table,
attached to a printed circuit board processing machine that processes a printed circuit board with a tool held at the tip of a spindle, and contacts the printed circuit board before the tool passes through the through hole and contacts the printed circuit board;
In a printed circuit board holding device equipped with a holding member that presses a printed circuit board during processing, a sliding groove is formed in the holding member perpendicular to the axial direction of the spindle and is slidably engaged with the sliding groove. A sliding member is provided, and a sliding mechanism is provided to slide the sliding member, and a plurality of presser pieces each having a through hole having a different diameter are fixedly attached to the sliding member, and a plurality of presser pieces are fixed to the sliding member, and a plurality of presser pieces are fixed to the sliding member, and a plurality of presser pieces are fixed to the sliding member, and a plurality of presser pieces are fixed to the sliding member. A printed circuit board holding device comprising: a control device that selects one of the holding pieces and drives the sliding mechanism. [Claim 2] A printed circuit board placed on a table,
attached to a printed circuit board processing machine that processes a printed circuit board with a tool held at the tip of a spindle, and contacts the printed circuit board before the tool passes through the through hole and contacts the printed circuit board;
In a printed circuit board holding device that includes a holding member that presses a printed circuit board during processing, the holding member is provided with an inclined surface forming a predetermined angle with the axial direction of the spindle, and the rotating surface is rotatably slid on the inclined surface. A member and a rotation mechanism for rotating the rotary member are provided, and a plurality of presser pieces having through holes each having a different diameter are fixed on the circumference of the rotary member, and in response to a command to replace the tool. A printed circuit board holding device comprising: a control device for selecting one of the holding pieces and driving the rotating mechanism.