JPH0673836B2 - Punching device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is for forming a hole for mounting or positioning a circuit element at a position of a pattern for identifying a drilling position formed in advance on a printed circuit board. The present invention relates to a punching device.

(Prior Art) This type of device projects light from above onto a pattern on a printed circuit board, receives the reflected image with a TV camera and stores it as an image, and the image signal is used to perform image processing of the center position of the pattern. According to the calculated value, the printed circuit board attached to the XY table is moved in the X and Y directions, and a hole is drilled at the calculated center position of the pattern. Further, as a punching device using a punch and a die, for example, in the punching device disclosed in Japanese Utility Model Laid-Open No. 57-193398, the punching device is used in order not to hinder the use of the scope installed above the center of the punching. It is attached to the tip of the operating arm, and the operating arm is rotatable and vertically movable with respect to the bearing tube of the lifting shaft, and the working arm and the lifting shaft are connected. This allows the punch to swing and move up and down.

However, in the above-mentioned punch, since the force of pushing down the punch is transmitted from the lifting shaft to the punch via the operating arm, the long operating arm is easily deformed, and the operating arm is required to have high rigidity. Further, since the punch is once disengaged from the position facing the die by swinging, the relative position between the punch and the die is likely to be displaced at the time of returning, and the punch may be damaged. Therefore, the applicant of the present application has previously proposed the invention disclosed in Japanese Patent Publication No. 63-120094 as a means for improving this point. With this, the punch and die are held in relative positions, and both are moved simultaneously by the XY table mechanism.

Further, in any of the above cases, the reflected image of the pattern by the projection light from above is subjected to image processing, and as the storage of the image of this reflected image, the video signal is once A / D converted,
For example, after correcting to 64 gradations, it is stored for each gradation. For example, as the printed circuit board such as epoxy substrate, glass epoxy substrate, phenol substrate, etc., the gradation of the reflected image is different as the type is different, or the gradation of the reflected image is different because the pattern at the drilling position is completely or half covered with resist, Or it may become unrecognizable. For this reason, the number of gradations required for image processing has become extremely large. Therefore, the applicant of the present application has previously proposed the invention disclosed in Japanese Patent Publication No. Sho 64-11404 in order to improve this point. This is a method of drilling with a drill, in which light is projected from below and the image from the transmitted light is received by a TV camera, but the light source is fixedly installed under the table. It was

(Problems to be solved) By the above improvement, the light is projected from below,
This device is also limited to a device that punches with a drill, and even if it is applied when punching with a punch and a die, light cannot be passed from below due to the die, so it has not been realized yet.

An object of the present invention is to enable a binary transmission image of light and dark to be obtained by light projected from below in a device that punches using a punch and a die instead of a drill, and the required gradation of image processing is 1 gradation. It is an object of the present invention to provide a punching device that can be processed by the method described above and that can punch holes accurately and quickly.

(Means for Solving the Problems) In order to achieve the above object, the punching device of the present invention is supported movably in the XY directions and is fixed to the lower plate driven by an XY table mechanism and the lower plate. A die, an upper plate that is vertically movable relative to the lower plate, and is arranged so as to move integrally with the lower plate in the XY direction, and is fixed to the upper plate so as to face the die. Punch, a work table fixedly provided between the lower plate and the upper plate, and a TV camera fixedly provided above the drilling position of the workpiece supported on the work table. And a light irradiation means provided on the lower plate so as to face the TV camera when the punch escapes from between the TV camera and the member to be processed by the XY table mechanism.

(Operation) The upper plate moves integrally with the lower plate in the X and Y directions, so that the relative positional relationship between the punch and the die, which have been accurately aligned once, does not change thereafter during the operation. TV
The camera and the light irradiation unit face each other when the punch escapes from between the TV camera and the member to be processed by the XY table mechanism, and at this time, the light from the light irradiation unit passes through the member to be processed and a transmitted image thereof. Is received by a TV camera to obtain a light-dark binary transmission image.

(Embodiment) An embodiment of the present invention will be described with reference to the drawings.

As shown in the first drawing, a lower plate 4 supported by an XY table mechanism 3 so as to be movable in the XY directions is provided below a fixed work table 2 which is located on a base 1 with a predetermined gap.
Is located. Lower plate 4 has base 1 on both sides
It is fitted in a guide groove of a support plate 1a fixedly erected on and is received movably in the XY directions. Lower plate 4
The die mounting portion 4a at the front end is thick and has a through hole 4b formed in the up-down direction. The die holding pipe 6 connected to the rear end of the die 5 is fitted into the through hole 4b, and the die 5
Is attached to the lower plate 4 by a die holder 7 connected to the tip of the die holding pipe 6. The die holder 7 is a position adjusting screw 8 attached to the lower plate 4.
The position can be adjusted by. Dice holding pipe 6
The rear end is connected to the flexible tube 9 so that the punch scraps can be sucked out by air.

Next, the XY table mechanism 3 will be described.

A bracket 103 that hangs from the X table 10 supports a nut 103 that meshes with a lead screw 102 for the X axis. Both ends of the lead screw 102 are bearings by a bearing portion 104, and one end thereof is a stepping motor 105 for the X axis.
Is coupled to the shaft of the shaft by a coupling 106. A bearing 12 is interposed between the X table 10 and the Y table 11. The means for driving the Y table 11 is the same as in the case of the X table 10 described above, 111 is a bracket hanging from the Y table 11, 112 is a lead screw for the Y axis, and 113 is a nut. A pin 13 projects upward from the Y table 11 and is fitted to a bearing 14 provided on the lower plate 4. The lower plate 4 is movable in the XY directions by the XY table mechanism 3 via the pins 13. Dice 5
Has the same level as the upper surface of the work table 2, and the work table 2 has a through hole so as not to interfere with the movement of the die 5, the die holder 7, and the position adjusting screw 8 which move in the XY direction together with the lower plate 4. 2a is formed.

Next, the upper plate 15 will be described.

A frame 16 extending vertically is fixed to the lower plate 4 and reinforced by a reinforcing plate 16a. This frame 1
Bearings 16b and 16c are provided on the shaft 6, and a guide shaft 17 is vertically movably supported. The upper plate 15 is connected to the guide shaft 17 at the bearing portions 15a on both sides of the upper plate 15 by tightening screws (not shown). Punch 19 on the front edge of the upper plate 15.
Are attached with nuts 20. The punch 19 is fixed so as to face the die 5. A shaft 21 is connected to a rear end portion of the upper plate 15 by a nut 22, and a stripper 24 is connected to a lower end of the shaft by a pin 23 so as to be slightly vertically swingable. At the front end of the stripper 24, a hole 24a through which the tip of the punch 19 penetrates and a protruding portion 24b for pressing the member to be processed are provided. Between the upper plate 15 and the stripper 24, a downward pressing force transmitting portion 25 is provided at an intermediate portion. That is, the shaft 27 that penetrates the bearing 26 provided on the upper plate 15 is provided with a circumferential groove 27a at its lower end and a spherical surface 27b at its lower end surface. The upper end of the shaft 27 projects through a cap 28 fixed to the upper plate 15, and a nut 29 is screwed into the cap 28 to regulate its height position. A spring 30 for urging a downward spring force on the shaft 27 is housed in the cap 28. The spherical surface 27b contacts the upper surface of the stripper 24, and the groove 27a
The holder 31 is locked from both sides to the stripper.
It is fixed on both sides of 24.

Next, the upper plate driving means 32 for moving the upper plate 15 up and down will be described.

A shaft 34 is supported by a side plate 33a of a frame 33 fixed to the base 1 as a fixing member, and a pressing lever 35 is swingably supported on the shaft 34. The pressing lever 35 transmits a force for moving the upper plate 15 up and down from the front end portion. That is, the rear end of the pressing lever 35 is swingably connected to the connecting shaft 37 of the pressing cylinder 36 fixed to the base 1 via the pin 38. Therefore, as the hydraulic cylinder 36 moves back and forth, the pressing lever 35 swings around the shaft 34, and the upper plate 15 is driven via the front end portion thereof. Reference numeral 39 denotes a screw for determining the degree of extension of the hydraulic cylinder 36, which is fixed to the upper plate 33b of the frame 33.

The front end of the pressing lever 35 is bifurcated into a pressing portion 35a. A long guide groove 35b extending in the front-rear direction (X direction) is formed at the front end of the pressing portion 35a. The punch pressing member 40 has a gate shape extending between the pressing portions 35a, 35a on both sides, and a shaft protruding from both side surfaces of the punch pressing member 40 has a guide long groove 35b.
It is slidable in the XY directions through this shaft. A connecting member 41 is fixedly attached to the front end surface of the upper plate 15, and the connecting member 41 and the punch pressing member 40 are configured so that they can be connected and divided via a connecting means (not shown).

The member A to be processed, which is conveyed on the work table 2 by a conveyer (not shown), is held by the position holding means 42. That is, two clamper levers 43 that extend parallel to the front
Is swingably supported at its rear end by a shaft 44 supported by the frame 33. A connecting lever 45 is fixed to the rear end of the clamper lever. The connecting lever 45 extends upward through the through hole 35c of the pressing lever 35, and its upper end is connected to the shaft of the air cylinder 46 fixed to the upper plate 33b of the frame 33 via a rod. ing. A clamper 47 is attached to the front end of the clamper lever 43. The clamper 47 is connected to the front end of the clamper lever 43 via shafts (not shown) protruding from both sides thereof so as to be slidable in the X direction but not displaceable in the vertical direction.

A TV camera 48 is fixedly disposed above the drilling position of the workpiece A on the work table 2. The lens 49 of the camera 48 faces the drilling position. Also lower plate 4
Is provided with a light irradiating means 50 near the mounting position of the die 5. As a light irradiation means, an optical fiber 51 continuous from a light source (not shown) is fixed by a fiber holder 52. This fixed position is a position where the upper end of the optical fiber 51 can face the lens 49 through the work member A when the punch 19 is removed from between the TV camera 48 and the work member A by the XY table mechanism 3. As shown in FIG. 2, the light L emitted from the upper end of the optical fiber 51 passes through the through hole 2a, passes through the member A to be processed, and is set to be able to be received by the TV camera 48 via the lens 49. There is.

Next, the operation of this device will be described.

The punch 19 of the upper plate 15 and the die 5 of the lower plate 4 are adjusted in advance to the exact opposite positions by the position adjusting screws 8. Therefore, for example, when making a hole for mounting a circuit element in the printed board A, which is a member to be processed, the printed board A is carried on the work table 2 in the Y direction by a carrying means (not shown), and the drilling position is provided under the lens 49. Come and stop. Therefore, the air cylinder of the position holding means 42
46 operates to swing the connecting lever 45 and the clamper lever 43 to lower the clamper 47. The clamper 47 presses the printed circuit board A with its lower surface and holds it in position. Then XY
The table mechanism 3 operates and the X table retreats, and the lower plate 4, the upper plate 15, and the stripper 24 all retract. The connecting member 41 retracts together with the upper plate 15, and the punch pressing member 40 also retracts together with the connecting member. Therefore, nothing obstructs between the printed circuit board A and the lens 49 (see FIG. 2).

Then, when light is projected by the light irradiation means 50, the light L passes through the through hole 2a, the printed board A, and the lens.
The transmission image is received by the TV camera 48 via 49. On the printed circuit board A, a lead pattern, a pattern for identifying a drilling position, a pattern for a hole for positioning, and the like are formed of copper, and a resist is formed except for a position where a circuit element is connected. . Therefore, when the transmission image is received by the TV camera as described above, the transmission image is dark in the part formed of a material that does not transmit light such as copper, and the substrate part and the resist are light transmissive. It is a bright, bright and dark binary image, and this image is stored in an image processing apparatus (not shown). The boundary line (threshold,
Level), the higher level is judged to be white,
Below that, it is judged as black. This transparent image is searched by the image processing device for points where the gradation of the image changes, the coordinates of the center position of the pattern are calculated from this image signal, and the coordinate signal is supplied to the XY table mechanism 3.

The XY table mechanism 3 operates by the supply of this signal, and moves the lower plate 4 in the XY directions. Since the movement amount of the lower plate 4 in the Y direction is within the range of the conveyance error of the printed board A, the lower plate 4 is supported so that a slight movement amount is possible. By this movement, the center of the die 5 fixed to the lower plate 4 comes to a position that coincides with the center of the hole to be opened. Since the upper plate 15 and the stripper 24 move together with the movement of the lower plate 4 via the frame 16, the positions where the punch 19 and the die 5 face each other do not change. Also upper plate 15
Of the punch pressing member 40 via the connecting member 41
Move in XY direction. At this time, since the pressing lever 35 is in the fixed position, only the punch pressing member 40 follows and moves.
For this purpose, the punch pressing member 40 is provided on the nut 20 of the punch 19.
Is always located. Then, the hydraulic cylinder 36 of the upper plate drive means 32 is driven, the front end of the pressing lever 35 is lowered, and the nut 20 is pressed by the punch pressing member 40.
By this pressing, the upper plate 15 moves down together with the guide shaft 17. The stripper 24 also descends via the shafts 21 and 27.
When the stripper protrusion 24b comes into contact with the printed circuit board A, the stripper 24 cannot descend any further, so only the upper plate 15 descends by compressing the spring 30. At this time, the punch 19 punches the printed circuit board A. The pressing force applied to the lower plate 4 through the die 5 and the die holder 7 by the drilling work is
Therefore, it is not transmitted to the XY table mechanism 3. The hydraulic cylinder 36 retracts, the front end of the pressing lever 35 rises, and the punch pressing member 40, the connecting member 41, and the upper plate 15 rise. The upper plate 15 begins to rise,
While the spring 30 can extend in the cap 28, the stripper 24 holds the printed circuit board A without moving upward,
The punch 19 escapes from the hole of the printed circuit board. After that, the stripper 24 also rises and returns to its original position.

(Effects of the Invention) The present invention has the above-described configuration, and since the light emitted from the light irradiating means is transmitted through the member to be processed and received by the TV camera, a binary transmission image of light and dark is obtained, Since only one gradation is required for image processing and the memory capacity is extremely small, quick and accurate drilling is possible. Further, since the upper plate having the punch fixed thereto moves integrally with the lower plate having the die fixed thereto in the X and Y directions, the relative position between the punch and the die does not shift and the punch is not damaged. Since the light irradiating means is provided on the lower plate to which the dice are fixed, the dice do not hinder the progress of the light, and the structure for obtaining the transmission image of the member to be processed can be simplified, which is extremely preferable.

[Brief description of drawings]

The drawings show one embodiment of the present invention. FIG. 1 is a cross-sectional view, and FIG. 2 is a cross-sectional view showing a state in which a light irradiation means and a TV camera face each other. A: Work piece, 2 ... Work table, 3 ... XY table mechanism, 4 ... Lower plate, 5 ... Die, 15 ... Upper plate, 19 ... Punch, 48 ... TV camera, 50 ... … Light irradiation means.

Claims (1)

[Claims] 1. A lower plate movably supported in XY directions and driven by an XY table mechanism, a die fixed to the lower plate, and vertically movable relative to the lower plate. Between the upper plate arranged so as to move integrally with the lower plate in the XY direction, the punch fixed to the upper plate so as to face the die, and between the lower plate and the upper plate. A work table fixedly provided on the work table, a TV camera fixedly arranged above the drilling position of the member to be processed supported on the work table, the TV camera and the TV camera by the XY table mechanism. Punching, characterized in that it is constituted by light irradiation means provided on the lower plate so as to face the TV camera when the punch escapes from between the member to be processed. Location.