JPH08168932A - Pressure foot for printed circuit board outline finishing machine - Google Patents

Abstract

PURPOSE: To provide a pressure foot for a printed circuit board outline finishing machine capable of reliably holding a product when separating it from an outer frame in machining outer pins. CONSTITUTION: A main body 4 supported to the lower end of a holder 3 of a spindle 1, a thrust ring 6 fixed on the lower surface of the main body, a presser member 9 capable of being relatively rotated in the radial direction to the thrust ring by steel balls 8, a locate cover 10 fixed on the thrust ring, and provided with a tapered slide-contact surface are provided. A pressure foot is provided with a locate ring 11 provided with a taper surface to be brought in slide-contact with the taper surface of the locate cover, and provided with a brush 14 on the lower end, a plurality of pins in the circumferential direction, fixed on the presser member, a plurality of springs in the circumferential direction, for energizing the presser member and the locate ring in a direction where they are separated from each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure foot used for a printed board contour processing machine.

[0002]

2. Description of the Related Art As a pressure foot for a printed board outer shape processing machine for processing the outer shape of a printed board, for example, Japanese Utility Model Laid-Open No. 61-5509 (Japanese Utility Model Publication No. 4-10992).
No .: hereinafter referred to as "prior art") is known. FIG. 4 is a cross-sectional view showing an example of a conventional pressure foot for a printed board contour processing machine. This prior art pressure foot for printed circuit board contour processing machine,
A main body 104, which is supported on the lower end of a piston 103 slidably arranged in the axial direction of the spindle 101 and is fixed to the lower end of the main body, opens between the main body and the outer periphery. A guide member 107 having a guide groove 106 and an annular groove 108 that opens downward at the lower end surface, and at one end of the inner peripheral surface, can slide in the guide groove only in the radial direction of the spindle. The pressing member 111 is formed with an annular flange portion that fits into the groove, and the annular brush 110 is slidably supported in the groove of the guide member in the axial direction of the spindle.

[0003]

SUMMARY OF THE INVENTION In the above-mentioned prior art, in the outer shape processing of a printed circuit board, an inner pin processing is performed in which a fixing pin is provided on a portion to be a product, and an outer frame portion not to be a product is fixed. It was intended to provide a pressure foot for a printed board external shape processing machine that can be commonly used for processing an external pin that is provided with a pin. However, when the product is separated from the outer frame in the outer pin processing, the product is pressed by the rubber fixed to the lower end of the pressing member, but the flange portion of the pressing member is formed between the lower end surface of the main body and the guide member. Since the sliding member slides in the guide groove, the pressing member may not slide smoothly relative to the main body due to the frictional resistance during the sliding, and the product may be displaced. Further, since the rubber that presses the product portion has a ring shape, it is difficult to apply a force uniformly to the entire pressing surface of the product, and the product may shift. Further, when the outer shape processing of the printed circuit board is completed, the spindle moves up and the pressing member is separated from the printed circuit board, and the spring mounted between the guide member and the pressing member returns the pressing member to the position where the coercive force of the spring is balanced. However, depending on the bending direction of the spring, the spring does not always return to a position that coincides with the axis of the spindle, which causes a problem that the product is pressed when the product is separated from the outer frame. The present invention has been made in view of the above circumstances, and in a pressure foot for a printed circuit board contour processing machine that can be commonly used for inner pin processing and outer pin processing, the product can be reliably pressed during outer pin processing, particularly when separating the product from the outer frame. The purpose of the present invention is to obtain a pressure foot for a printed circuit board contour processing machine that can be used.

[0004]

According to the present invention, the above object is to provide a main body 4 supported on the lower end of a holder 3 which is arranged on the outer periphery of a spindle 1 so as to be slidable in the axial direction, and a main body 4 of the main body. A thrust ring 6 fixed to the lower end surface and having a wide annular groove 6a on the lower surface side, and a plurality of steel balls 8 held by a retainer 7 arranged in the annular groove of the thrust ring.
And a flange portion 1 fixed to the outer periphery of the lower surface of the thrust ring.
0a and a cylindrical portion 10b depending from the outer peripheral surface of the flange portion.
A locate cover 10 having a taper portion 10c whose diameter gradually decreases from the lower end of the cylindrical portion, and a tapered outer circumference which axially slides in contact with the inner peripheral surface of the pressing member and whose diameter gradually decreases downward. A locate ring 11 that is in sliding contact with the inner surface of the tapered portion of the locate cover, and a pin 12 that is provided on the lower surface of the pressing member in the circumferential direction and is inserted into a hole formed in the locate ring.
Plural circumferentially arranged between the cylindrical recessed groove 9a formed on the lower surface of the pressing member and the annular recessed groove 11a formed on the upper surface of the locate ring so that the pressing member and the locate ring are separated from each other. This is achieved by a pressure foot for a printed circuit board contour processing machine, characterized in that a biasing spring 15 and an annular brush 14 are provided at the lower end on the inner diameter side of the locate ring.

[0005]

In the pressure foot for a printed circuit board contour processing machine having the above-described structure, the steel ball is arranged between the thrust ring and the pressing member, so that the pressing member can be moved in the radial direction with extremely small frictional resistance. Further, since the portion for pressing the product is made up of a plurality of pins, the product can be reliably pressed. Also, due to the sliding contact between the spring arranged between the pressing member and the locate ring and the inner surface of the taper portion of the locate cover and the outer surface of the locate ring, the locate ring is centered and the spindle axis Be sure to return to the position.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in detail with reference to the accompanying drawings showing its embodiments. 1 to 3 show a preferred embodiment of the present invention. In FIG. 1, a cutter 2 is held at the tip of a spindle 1. A holder 3 slidably fitted to the spindle 1 is arranged on the outer periphery of the spindle 1. Air cylinders (not shown) that can be driven in the vertical direction are attached to both sides of the holder 3, and the air pressure of the air cylinders can be switched between low pressure and high pressure. An annular main body 4 is fixed to the lower end of the holder 3, and a duct 5 for sucking and removing chips generated by processing is connected to the main body 4 and the duct 5 is a vacuum suction source (not shown). Connected).

A thrust ring 6 is formed on the lower end surface of the main body 4.
Is attached to the lower surface of the thrust ring 6,
A wide annular groove 6a is formed near the inner diameter thereof, and a fitting groove is formed on the outer peripheral portion of the lower surface. The thrust ring 6
A plurality of steel balls 8 are held by the retainer 7 arranged in the annular groove 6a on the lower surface, and the steel balls 8 are arranged on the upper surface of the pressing member 9. A locate cover 10 having a ring-shaped flange portion 10a, a cylindrical portion 10b hanging from the outer surface of the flange portion, and a taper portion 10c having a diameter gradually decreasing from the lower end of the cylindrical portion is a lower surface of the thrust ring 6 at the flange portion 10a. Is fixed in a fitting groove formed on the outer peripheral portion of the. A plurality of product pressing pins 12 for separating the product from the outer frame are fixed to the lower surface of the pressing member 9 in the circumferential direction, and the disk-shaped rubber 1 is attached to the tip of the pin 12.
3 is attached. The locate ring 11 is in sliding contact with the inner peripheral surface side of the pressing member 9 in the axial direction, and is in sliding contact with the inner surface of the tapered portion of the locate cover 10 on the tapered outer surface of which the diameter is gradually reduced downward. The pin 12 is disposed below and the pin 12 is inserted into a hole formed in the locate ring 11. A plurality of cylindrical concave grooves 9a are formed on the lower surface of the pressing member 9 in the circumferential direction with a phase difference in the circumferential direction from the arrangement position of the pin 12, and an annular concave groove 11a is formed on the upper surface of the locate ring 11. A spring 15 is disposed between the cylindrical groove 9a and the annular groove 11a so as to bias the pressing member 9 and the locate ring 11 away from each other. An annular brush 14 is incorporated in a groove formed at the lower end on the inner diameter side of the locate ring 11. In FIG. 1, reference numeral 18 is a printed circuit board.

In the above structure, the locate ring 11 incorporating the brush 14 has the steel ball 8 through the pressing member 9.
By means of this, it is possible to move in the radial direction with the thrust ring 6, and by pressing the holder with a force greater than the biasing force of the spring 15, it becomes possible to slide in the direction toward the pressing member 9 in the axial direction. There is. Further, the locate ring 11 is constantly applied with force by the spring 15 in a direction in which the locate ring 11 is separated from the holding member 9, and
The tapered outer surface of the locating cover 10 and the inner surface of the tapered portion 10c of the locate cover 10 are in sliding contact with each other, so that they are positioned at the axial center position of the spindle 1 by the centripetal action.

In the pressure foot for a printed circuit board contour processing machine according to the present invention having the above-described structure, the operation for processing the outer pin will be described below. The printed circuit board 18 is fixed by providing fixing pins on an outer frame portion which does not become a product. The spindle 1 and the printed circuit board 18 are relatively moved in the horizontal direction by a movement command from a numerical controller or the like until they reach a processing start point. Rotate the cutter 2,
The spindle 1 is lowered to a position where the tip of the cutter 2 has a predetermined cutting depth. At this time, the brush 14 is in contact with the upper surface of the printed circuit board 18, but low pressure air is supplied to the air cylinder and the holder 4 is pressed with a force smaller than the biasing force of the spring 15, so that the printed circuit board 1
The brush 8 is lightly pressed by the brush 14. In this state, the spindle 1 is moved by a movement command from the numerical controller or the like.
Performs a predetermined movement with respect to the printed circuit board 18 to process the outer shape of the printed circuit board 18 into a desired shape. The brush 1
The pressing of 4 can prevent the printed circuit board 18 from fluttering during outer shape processing. The chips generated during processing are continuously sucked out of the duct 5 by the vacuum suction source.

When the processing proceeds until just before the product portion is separated from the outer frame, a high pressure air higher than the pressure of the spring 15 is supplied to the air cylinder by a predetermined signal and the holder 4
Descends. When the holder 4 starts descending, the inner surface of the tapered portion 10c of the locate cover 10 and the tapered outer surface of the locate ring 11 start to separate, and the pin 12 fixed to the pressing member 9 projects from the lower surface of the locate ring 11.
The rubber 13 attached to the tip of the pin 12 is the printed circuit board 18
The lowering of the holder 4 stops at the position where the upper surface of the holder is pressed.
In this state, the spindle 1 is moved to separate the product part from the outer frame. At this time, the product portion is securely fixed by the frictional force of the rubber, and the thrust ring 6 and the pressing member 9 move smoothly relative to each other by the steel balls 8, so that the product can be separated without deviation. .

When the cutting process is completed, the vacuum suction is stopped, the spindle 1 is raised, and the cutter 2 is separated from the printed circuit board 18. Here, since the vacuum suction is stopped immediately after the end of the cutting process, the processed product portion is not lifted by the suction force and scratched by the cutter 2. When the spindle 1 is raised, the spring 1
5, the locate ring 11 and the locate cover 10 come into contact with each other in the tapered portion while centering, the pin 12 protruding from the lower surface of the locate ring 11 is retracted to a predetermined position, and the pressure foot returns to the initial state.

In the case of the inner pin processing, there is no problem because the brush 14 is always applied with a low pressing force in all the processing steps from the start of cutting to the separation of the product portion from the outer frame.

[0013]

Since the steel balls are arranged between the thrust ring and the pressing member, the pressing member can be moved in the radial direction with extremely small frictional resistance, and the pressing member side is fixed when the product is separated from the outer frame. The main body moves smoothly and can be processed. Further, since the pressing portion of the product is composed of a plurality of pins to which rubber is adhered, the product can be reliably pressed and the product will not be displaced. Also, due to the sliding contact between the spring arranged between the pressing member and the locate ring and the inner surface of the taper portion of the locate cover and the outer surface of the locate ring, the locate ring is centered and the spindle axis It is possible to reliably return to the position and always perform a reliable function of the pressure foot.

[Brief description of drawings]

FIG. 1 is a sectional view showing a preferred embodiment of a pressure foot for a printed board contour processing machine according to the present invention.

FIG. 2 is a bottom view of a pressure foot for a printed board contour processing machine in FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view showing an example of a conventional pressure foot for a printed circuit board contour processing machine.

[Explanation of symbols]

 1 Spindle 2 Cutter 3 Holder 4 Main Body 5 Duct 6 Thrust Ring 7 Retainer 8 Steel Ball 9 Pressing Member 10 Locate Cover 11 Locate Ring 12 Pin 13 Rubber 14 Brush 15 Spring

Claims (1)

[Claims] 1. A main body (4) supported on the lower end of a holder (3) slidably arranged in the outer periphery of a spindle (1) and a lower surface side fixed to the lower end surface of the main body. Thrust ring (6) having wide annular groove (6a) in
A pressing member (9) movably arranged in the radial direction by a plurality of steel balls (8) held by a retainer (7) arranged in an annular groove of the thrust ring, and the thrust. Flange part (10a) fixed to the outer peripheral part of the lower surface of the ring
And a cylindrical portion (10b) hanging from the outer peripheral surface of the flange portion.
And a taper portion (10
c) and a taper-shaped inner surface of the locate cover on the outer peripheral surface of the tapered shape, which is in sliding contact with the inner peripheral surface of the pressing member in the axial direction and whose diameter is gradually reduced downward. Locate ring that slides (1
1), a pin (12) provided on the lower surface of the pressing member in the circumferential direction thereof and inserted through a hole formed in the locate ring, and a cylindrical groove formed on the lower surface of the pressing member. A plurality of springs (15) are arranged circumferentially between (9a) and the annular groove (11a) formed on the upper surface of the locate ring to urge the pressing member and the locate ring away from each other. ) And an annular brush (14) at the lower end on the inner diameter side of the locate ring, the pressure foot for a printed circuit board outer shape processing machine.