JPH11188693A - Printed circuit board presser - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a printed circuit board presser using for a printed circuit board drill which can reduce the size and cost, and conduct desired drilling exactly without interference of a stack pin. SOLUTION: This printed circuit board presser is provided with a slider 6 formed at the lower end of a pressure foot 1 so as to be movable orthogonally to the axial direction of a spindle 3, an opening part 7a which a drill 4 invade, a front end bush 7 retained on the slider 6 so as to come into contact with the printed circuit board when the printed circuit board is pressed, and a driving means 9 for driving the slider 6 in its moving direction, and is constituted by forming the opening part 7a of the front end bush 7 into a deformed shape continuous along the moving direction of the slider 6 so as to meet a plurality of types of drill diameters, so that a part of the shape meeting the drill diameter jointed to the spindle 3 can be positioned by the driving means 9 so as to be positioned on the axis of the spindle 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printed board holding device having a pressure foot for holding a printed board when a printed board is punched by a printed board punching machine.

[0002]

2. Description of the Related Art As this type of printed board holding device, for example, Japanese Patent Laid-Open Publication No. 4-354609 discloses a sliding member provided at the lower end of a pressure foot so as to be movable in a direction perpendicular to the axial direction of a spindle. The slide member is provided with a plurality of tip bushes each having a through hole having a different hole diameter along the moving direction, and according to the drill diameter held by the spindle, the slide member is driven to drive the corresponding tip bush into the spindle. An arrangement for positioning on an axis is disclosed.

[0003]

However, in the above-described printed circuit board holding device, since the slide member is provided with a plurality of tip bushes, there is a problem that the cost is increased, and the plurality of tip bushes are connected to each other. There is a problem in that the moving distance of the slide member is increased and the size of the slide member is increased because the distance is provided. Another problem is that another end bush located off the axis of the spindle abuts on a stack pin used to stack a plurality of printed circuit boards on the table, and a desired hole may not be formed. is there.

The present invention has been made in view of such conventional problems, and can be made small and inexpensive.
It is an object of the present invention to provide a printed circuit board holding device used in a printed circuit board punching machine that is appropriately configured so that a desired hole can be reliably formed without being disturbed by stack pins.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention is provided in a printed circuit board drilling machine, which presses a printed circuit board when drilling the printed circuit board with a drill connected to a spindle. In a printed circuit board holding device having a pressure foot for
A slider provided at a lower end portion of the pressure foot so as to be movable in a direction orthogonal to an axial direction of the spindle;
It has an opening through which a drill penetrates, and has one tip bush held on the slider so as to contact the printed board when pressing the printed board, and driving means for driving the slider in the moving direction. The opening of the tip bush has an irregular shape that is continuous along the moving direction of the slider so as to correspond to a plurality of types of drill diameters,
The present invention is characterized in that the drive means can be positioned so that a shape portion corresponding to the diameter of a drill connected to the spindle is located on the axis of the spindle.

[0006]

Embodiments of the present invention will be described below with reference to the drawings. 1 and 2 are a sectional view and a bottom view, respectively, showing a first embodiment of a printed board holding device according to the present invention. At the lower end of the pressure foot 1, a tip plate 2 is provided. Tip plate 2
On the axis of the spindle 3, there is formed an opening 2a through which a tool exchange post (not shown) used for attaching and detaching the drill 4 to and from the spindle 3 can penetrate. A slide groove 2b is formed along a direction perpendicular to the axis, and guide plates 5a and 5b are provided on both sides of the slide groove 2b. A space between the slide groove 2b and the guide plates 5a and 5b is orthogonal to the axial direction of the spindle 3. The slider 6 is provided so as to be movable in the direction.

An opening 6a is formed in the slider 6 at one position crossing the axis of the spindle 3 in the sliding direction, and an opening 7a into which the drill 4 enters is formed in the opening 6a.
When pressing a printed circuit board (not shown), a leading end bush 7 that is in contact with the printed circuit board is fitted and provided. A multi-position cylinder 9 is provided on the peripheral surface of the pressure foot 1 via a bracket 8 and the rod 9
a is connected to one end of the slider 6 in the sliding direction.

In this embodiment, the opening 7a of the distal end bush 7 is formed with a large-diameter portion 11a formed in the center portion through which a tool exchange post can enter, and both sides in the moving direction of the slider 6 communicating with the large-diameter portion 11a. And a continuous irregular shape having a small-diameter portion 11b and a medium-diameter portion 11c. Here, the diameter (groove width) of the small diameter portion 11b is, for example, 3
mm, the diameter (groove width) of the medium diameter 11c is, for example, 5 mm.

In this manner, the slider 6 is moved by driving the multi-position cylinder 9 to position the large-diameter portion 11a on the axis of the spindle 3 at the time of drill exchange. The small diameter portion 11b is used for drilling with the drill 4 of the above, the medium diameter portion 11c is used for drilling with the drill 4 having a diameter of 2.5 mm to 4.0 mm, and the drill having a diameter exceeding 4.0 mm. When drilling is performed in step 4, the large-diameter portion 11a is automatically positioned on the axis of the spindle 3 to perform drilling.

In recent years, as electronic components mounted on a printed circuit board have become smaller, the diameter of a through hole formed on the printed circuit board has become smaller.
Drilling with a 0.35 mm drill is relatively common. In the second embodiment of the present invention, in consideration of such circumstances, as shown in a bottom view in FIG. 3, in the configuration shown in FIGS.
Are formed in a continuous irregular shape having a large-diameter portion 12a into which the tool exchange post can enter, and a small-diameter portion 12b formed on one side in the moving direction of the slider 6 in communication with the large-diameter portion 12a. Here, the diameter (groove width) of the small diameter portion 12b is, for example, about 2 mm. Further, instead of the multi-position cylinder 9 shown in FIGS. 1 and 2, a normal cylinder 13 for positioning the slider 6 at two positions is used.
Other configurations are the same as those of the first embodiment, and therefore, the same portions are denoted by the same reference characters and description thereof will be omitted.

In this manner, the slider 6 is moved by driving the cylinder 13 so that the large-diameter portion 1 is replaced when the drill is replaced.
Position 2a on the axis of spindle 3, 0.35m
When drilling with a drill 4 having a diameter of m or less, the small diameter portion 12 is used.
When drilling b with a drill 4 having a diameter of more than 0.35 mm, the large-diameter portions 12a are automatically positioned on the axis of the spindle 3 to perform drilling.

It should be noted that the present invention is not limited to the above-described embodiment, and various modifications or changes can be made. For example, in the first embodiment, the opening 7a of the tip bush 7 is configured to have a continuous irregular shape in which three openings of the large-diameter portion 11a, the small-diameter portion 11b, and the middle-diameter portion 11c communicate in the sliding direction. It is also possible to form a continuous deformed shape having more openings with different diameters so that the drill diameter to be used is divided into smaller ranges to correspond to each opening.

[0013]

According to the present invention, one tip bush is provided on the slider, and the opening of the tip bush is formed into a deformed shape that is continuous along the sliding direction so as to correspond to a plurality of drill diameters. Since the shape portion corresponding to the diameter can be positioned on the axis of the spindle, it can be inexpensive, and the moving amount of the slider can be reduced and the size can be reduced. In addition, since there is only one end bush, desired drilling can be reliably performed with little obstruction by the stack pins.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a first embodiment of the present invention.

FIG. 2 is also a bottom view.

FIG. 3 is a bottom view showing a second embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 pressure foot 2 tip plate 2a opening 2b slide groove 3 spindle 4 drill 5a, 5b guide plate 6 slider 6a opening 7 tip bush 7a opening 8 bracket 9 multi-position cylinder 9a rod 11a large diameter part 11b small diameter part 11c medium diameter part 12a Large diameter part 12b Small diameter part 13 Cylinder

Claims (1)

[Claims] 1. A printed board pressing device provided in a printed board drilling machine and having a pressure foot for pressing the printed board when drilling the printed board with a drill coupled to a spindle. A slider provided at a lower end of the slider so as to be movable in a direction orthogonal to the axial direction of the spindle; and an opening through which a drill enters, and the slider being in contact with the printed board when pressing the printed board. And a driving means for driving the slider in the direction of movement thereof. The opening of the end bush is formed along the moving direction of the slider so as to correspond to a plurality of drill diameters. And a shape portion corresponding to the diameter of the drill connected to the spindle is formed in a continuous shape. PCB hold-down device which is characterized by being configured to be positioned by the drive means so as to be positioned on the line.