CN105992462B

CN105992462B - Hole opening device

Info

Publication number: CN105992462B
Application number: CN201610012170.0A
Authority: CN
Inventors: 中垣祐二
Original assignee: Seiko Chronograph Ltd
Current assignee: Seiko Chuangshi Co.,Ltd.
Priority date: 2015-03-20
Filing date: 2016-01-08
Publication date: 2020-03-06
Anticipated expiration: 2036-01-08
Also published as: CN105992462A; JP6573251B2; JP2016175158A; TWI723969B; TW201634155A

Abstract

The invention provides a punching device which has excellent manufacturing efficiency and can inhibit the generation of burrs. The hole forming device (1) comprises: a drill (D) for drilling a hole in a workpiece (W); a main shaft section (12) that rotatably holds a drill (D); a drill bushing (40) which is arranged opposite to the main shaft (12) and presses the workpiece (W) toward the main shaft (12) when the workpiece (W) is drilled; and a band-shaped sheet (S) which is clamped between the drill bushing (40) and the workpiece (W) when the workpiece (W) is drilled.

Description

Hole opening device

Technical Field

The present invention relates to a tapping device.

Background

A drilling device for drilling a hole in a workpiece such as a printed circuit board by a drill is known. For example, patent document 1 describes a hole drilling device including: a work table; a spindle that can be rotated and lifted and that holds a tool for processing a printed circuit board placed on a table; and a pressing device for pressing the printed substrate on the worktable when processing the printed substrate.

In general, a drilling device performs drilling on a workpiece while pressing the workpiece from the side opposite to a drill toward the drill by a support member. The support member is arranged to be replaceable. When the support member is used for the first time after replacement of the support member, the support member is drilled together with the workpiece by the drill. In each of the second and subsequent drilling operations, the drill is inserted into the hole of the support member that was opened in the first use. The drill is repeatedly inserted into the hole of the support member by drilling, and the hole diameter is gradually enlarged by slight wobbling of the drill.

Patent document 1: japanese patent No. 5138273

However, in the above-described conventional drilling device, if the hole diameter of the support member is enlarged, a gap is generated between the hole of the support member and the drill when drilling the workpiece.

When the drill penetrates the workpiece, a part of the material constituting the workpiece is extruded into the gap between the hole of the support member and the drill. Therefore, a flash (バリ) is generated at the opening edge of the hole formed in the workpiece so as to protrude toward the support member side.

In order to suppress the generation of burrs, it is conceivable to replace the support member before the hole of the support member is enlarged to a predetermined size. However, if the support member is frequently replaced, the drilling process must be interrupted every time the support member is replaced, and the manufacturing efficiency is reduced. Therefore, the conventional drilling device has a problem in that the production efficiency is reduced and the generation of burrs is prevented.

Disclosure of Invention

Accordingly, an object of the present invention is to provide a punching device which is excellent in manufacturing efficiency and can suppress the generation of burrs.

The tapping device of the present invention is characterized by comprising: a drill for drilling a hole in a workpiece; a bit holding portion that holds the bit rotatably; a support member that is disposed opposite to the drill holder and presses the workpiece toward the drill holder when drilling the workpiece; and a sheet-like sandwiching member that is sandwiched between the support member and the workpiece when the workpiece is bored.

According to the present invention, since the sheet-like interposed member is sandwiched between the support member and the workpiece when the workpiece is bored, the opening edge of the workpiece on the support member side can be covered with the interposed member. Thus, when the drill penetrates the workpiece, the material constituting the workpiece can be brought into contact with the interposed member to prevent the material from being pushed out of the opening edge of the workpiece on the support member side into the gap between the hole of the support member and the drill. Therefore, even if the hole diameter of the support member is enlarged to a predetermined size at the time of drilling the workpiece, the occurrence of burrs at the opening edge of the workpiece on the support member side can be suppressed without replacing the support member. Further, since the intermediate member is in the form of a sheet, it is easy to convey the intermediate member, and therefore, it is possible to easily introduce an unused intermediate member between the support member and the workpiece. Therefore, the generation of burrs can be easily suppressed as compared with the case where the support member is replaced to suppress the generation of burrs. Therefore, the punching device which is excellent in manufacturing efficiency and can suppress the generation of burrs can be formed.

In the above-described hole forming device, it is preferable that the interposed member is formed in a band shape.

According to the present invention, since the interposed member is formed in a belt shape, the interposed member can be made to travel between the support member and the workpiece. By running the intermediate member, the used portion of the intermediate member can be moved to the outside from between the support member and the workpiece, and the unused portion of the intermediate member can be introduced and sandwiched between the support member and the workpiece. Therefore, the unused portion of the interposed member can be introduced between the support member and the workpiece without interrupting the drilling process, and a reduction in manufacturing efficiency can be suppressed.

In the above-described hole forming device, it is preferable that the hole forming device further includes an interposed member holding unit including: a 1 st reel on which the intermediate member can be wound, the 1 st reel being connected to one end of the intermediate member; and a 2 nd reel on which the intermediate member is windable and which is connected to the other end of the intermediate member, wherein the intermediate member holding means is detachably provided to the support member.

According to the present invention, since the hole drilling device includes the intermediate member holding unit which is detachable from the support member, after the intermediate member wound around the 1 st reel and the 2 nd reel is used, the 1 st reel and the 2 nd reel can be collectively replaced with respect to the intermediate member holding unit. Therefore, the time for interrupting the drilling process can be shortened, and the reduction of the manufacturing efficiency can be suppressed.

In the above-described hole forming device, it is preferable that the interposed member holding unit moves integrally with the support member.

According to the present invention, since the intermediate member holding means moves integrally with the support member, the intermediate member can be prevented from being pulled out from the 1 st reel and the 2 nd reel and from being loosened as the support member moves. Therefore, for example, the interposed member can be prevented from being sandwiched between the support member and the workpiece in a loose state, and a problem that the support member cannot properly press the workpiece can be prevented. Therefore, the hole drilling of the workpiece can be performed precisely.

In the above-described hole forming device, it is preferable that the hole forming device further includes: a drive source that drives the 1 st reel to rotate so that the 1 st reel winds the interposed member wound on the 2 nd reel; and a resistance applying member that applies a load to the rotation of the 2 nd reel.

According to the present invention, since the 1 st reel is driven to rotate by the drive source and the 1 st reel winds the intermediate member wound around the 2 nd reel, the intermediate member positioned between the support member and the workpiece can be automatically and easily moved. Further, since the hole forming device includes the resistance applying member that applies a load to the rotation of the 2 nd reel, when the intermediate member is drawn out from the 2 nd reel by the rotation of the 1 st reel, it is possible to prevent the intermediate member drawn out from the 2 nd reel from being loosened due to the excessive rotation of the 2 nd reel by the inertial force. Therefore, the hole forming process of the workpiece can be performed precisely while improving the manufacturing efficiency.

In the above drilling device, it is preferable that the 1 st reel and the 2 nd reel are disposed on a side opposite to the bit holding portion with a surface of the support member on the bit holding portion side interposed therebetween.

According to the present invention, since the 1 st reel and the 2 nd reel are disposed on the opposite side of the drill holding portion with respect to the surface of the support member on the drill holding portion side, the arrangement positions of the 1 st reel and the 2 nd reel can be set without considering the problem of contact with the workpiece. Therefore, for example, the 1 st reel and the 2 nd reel can be disposed close to each other, and the intermediate member holding means can be downsized.

Effects of the invention

Drawings

Fig. 1 is a perspective view of the hole forming device of the present embodiment.

Fig. 2 is an explanatory view explaining the structure of the hole-opening device, and is a partial sectional view of the hole-opening device as viewed from the front.

Fig. 3 is a perspective view of the pressing unit.

Fig. 4 is an exploded perspective view of the pressing unit.

Fig. 5 is a sectional view taken along line V-V of fig. 3.

Fig. 6 is a plan view of the pressing unit.

Description of the reference symbols

1: a tapping device; 12: a main shaft portion (bit holding portion); 22: a sheet holding unit (interposed member holding unit); 30: a drive source; 40: a drill bushing (support member); 40 a: the upper surface of the drill bushing (the face on the bit holding portion side of the bearing member); 61: a sheet storage roll (2 nd roll); 62: a sheet recovery roll (1 st roll); 66: a resistance applying member; d: a drill bit; s: a sheet (a sandwiched member); w: and (5) a workpiece.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a perspective view of the hole forming device of the present embodiment. The hole drilling device is used in a state of being placed on a horizontal installation surface. In the figure, the direction indicated by the arrow UP coincides with the vertically upward direction.

As shown in fig. 1, the drilling device 1 drills a hole in a workpiece W such as a printed circuit board by moving a spindle unit 12 (corresponding to a "drill holder" in the claims) to which a drill D (see fig. 2) is attached in the vertical direction in the axial direction (vertical direction) of the drill D. The hole drilling device 1 includes a housing 2 and a cover 3 covering an upper surface of the housing 2.

The housing 2 is formed in a rectangular parallelepiped shape. The following components are provided on the upper surface of the housing 2: a workpiece table 5 on which a workpiece W is placed in a horizontal direction on the workpiece table 5; and a workpiece moving mechanism (not shown) that moves the workpiece W placed on the workpiece table 5 in the front-rear direction. In fig. 1, a direction along the longitudinal direction when the housing 2 is viewed from the top-bottom direction is defined as a left-right direction and is denoted by an arrow LH, and a direction indicated by the arrow LH is defined as a left direction. In fig. 1, a direction along the short side direction when the housing 2 is viewed from the top-bottom direction is defined as the front-back direction, and an arrow FR is given, and a direction indicated by the arrow FR is defined as the front.

A pair of processing portions 10 are arranged on the upper surface of the housing 2 in the left-right direction. The pair of processing units 10 are configured to be movable in the left-right direction within a predetermined range by a gantry moving mechanism (not shown) including, for example, a linear actuator. The pair of processing portions 10 is formed to be plane-symmetric with respect to a plane perpendicular to the left-right direction. Therefore, in the following description, the left processing unit 10 will be mainly described, and the parts of the right processing unit 10 corresponding to the left processing unit 10 are denoted by the same reference numerals and the description thereof will be omitted.

Fig. 2 is an explanatory view explaining the structure of the hole-opening device, and is a partial sectional view of the hole-opening device as viewed from the front. As shown in fig. 2, the processing unit 10 includes: the spindle drive device includes a gantry 11, a spindle unit 12 supported to be movable in the vertical direction with respect to the gantry 11, and a spindle moving mechanism (not shown) for moving the spindle unit 12 in the vertical direction. The main shaft portion 12 rotatably holds the drill D. A box-shaped pressing member 13 is attached to a lower end of the main shaft portion 12, and the pressing member 13 covers the main shaft portion 12 and the drill D. The pressing member 13 is slidable on the outer peripheral surface of the main shaft portion 12, and is movable in the vertical direction with respect to the main shaft portion 12. The pressing member 13 is biased downward with respect to the main shaft portion 12 by a biasing member not shown or the like. A drill hole 13a coaxial with the drill D is formed in the lower end of the pressing member 13. When the main shaft portion 12 is moved downward by the main shaft moving mechanism while the drill D is driven to rotate, the drill D passes through the drill hole 13a and forms a hole in the workpiece W placed on the workpiece table 5. At this time, the pressing member 13, which is biased downward with respect to the main shaft portion 12, abuts against the workpiece W from above, and presses the workpiece W from above downward.

The drilling device 1 further includes a pressing unit 20, and the pressing unit 20 is disposed on the opposite side of the main shaft portion 12 with respect to the work table 5. The pressing unit 20 is configured to be movable in the left-right direction, as in the processing section 10.

Fig. 3 is a perspective view of the pressing unit. Fig. 4 is an exploded perspective view of the pressing unit. In the following drawings, a part of a sheet S to be described later is shown by a two-dot chain line for easy understanding.

As shown in fig. 3 and 4, the pressing unit 20 has a drill bushing supporting unit 21 and a sheet holding unit 22 (corresponding to the "interposed member holding unit" of the claims).

As shown in fig. 4, the drill bushing supporting unit 21 has: a base member 23; a drill bushing support 32; a drill sleeve support barrel 38; and a drill bushing 40 (corresponding to the "support member" of the claims).

The base member 23 is formed in a rectangular parallelepiped shape long in the front-rear direction. A pair of guide shaft insertion holes 24 are formed at both front and rear end portions of the base member 23, and the pair of guide shaft insertion holes 24 vertically penetrate the base member 23. The guide shaft 6 (see fig. 2) is inserted through the guide shaft insertion hole 24. The base member 23 is supported to be movable in the vertical direction. Further, a locking piece 26 having a rectangular frame shape as viewed in the left-right direction is attached to the lower surface of the base member 23. The pressing unit moving mechanism, not shown, is locked inside the locking block 26. The pressing means moving mechanism is, for example, an air cylinder, and can move the base member 23 supported by the guide shaft 6 to be movable in the vertical direction.

Projecting plates 28 having a thickness in the front-rear direction are provided upright on both sides of the base member 23 in the left-right direction. The pair of projection-setting plates 28 extend in the left-right direction at the same positions in the front-rear direction, respectively. The pair of projection plates 28 is formed in a rectangular shape when viewed from the front-rear direction. A drive source 30 such as a motor is attached to the right one 28A of the pair of projection plates 28. The drive source 30 is attached to the rear side of the right protruding plate 28A, and the output shaft 30a of the drive source 30 penetrates the right protruding plate 28A and protrudes to the front side of the right protruding plate 28A.

The drill bushing support portion 32 is formed in a cylindrical shape. The drill bushing support portion 32 is arranged to protrude upward on the upper surface of the base member 23. The drill bushing support portion 32 is integrally formed by a cylindrical portion 33 extending in the vertical direction and a pedestal portion 34 extending from the lower end portion of the cylindrical portion 33 toward both front and rear sides. The base portion 34 is fixed to the upper surface of the base member 23 at portions on both front and rear sides across the tube portion 33 by fastening members 35 such as bolts. The drill bushing support portion 32 is disposed so that a gap is formed between the rear end portion of the cylindrical portion 33 and the front surface of the projection plate 28 in the front-rear direction.

Fig. 5 is a sectional view taken along line V-V of fig. 3.

As shown in fig. 5, the drill bushing supporting cylinder 38 is formed in a cylindrical shape. The drill bushing support cylinder 38 is hermetically fitted in the upper end opening of the drill bushing support portion 32. The inner peripheral surface of the drill bushing support cylinder 38 is expanded in diameter at the upper end portion with a step portion 38a interposed therebetween. A flange 38b extending outward is provided at the vertical center of the drill bushing support cylinder 38. The flange 38b abuts the upper end edge of the drill bushing support 32. As shown in fig. 4, 4 slits 38c cut downward are formed at equal intervals at the upper end edge of the drill bushing support cylinder 38. The vertical position of the lower end edge of the slit 38c substantially coincides with the stepped portion 38 a. The drill bushing support sleeve 38 is fixed to the cylindrical portion 33 by a screw 36, and the screw 36 is screwed into the cylindrical portion 33 of the drill bushing support portion 32 from the front.

The drill bushing 40 is formed in a rectangular parallelepiped shape, for example, of Glass epoxy (Glass epoxy) or the like, and is formed in a square shape when viewed from the top-bottom direction. The drill bushing 40 is fitted into the upper end opening of the drill bushing support cylinder 38. As shown in fig. 5, the lower surface of the drill sleeve 40 abuts against the step portion 38a of the drill sleeve support cylinder 38.

The dimension of the drill bushing 40 in the vertical direction is larger than the distance from the upper end edge of the drill bushing supporting cylinder 38 to the step portion 38 a. Thus, the upper surface 40a of the drill sleeve 40 protrudes from the upper end edge of the drill sleeve support barrel 38. As shown in fig. 4, the length of the diagonal line of the drill bushing 40 is slightly larger than the inner diameter of the drill bushing support tube 38 at the upper end thereof when viewed in the vertical direction. The corner of the drill bushing 40 when viewed in the vertical direction engages the slit 38c of the drill bushing support tube 38. This prevents the drill bushing 40 from falling off the drill bushing support cylinder 38.

As shown in fig. 5, the length of one side of the drill bushing 40 is larger than the inner diameter of the drill bushing support tube 38 below the step 38a when viewed in the vertical direction. Thereby, the drill sleeve 40 closes the inside of the drill sleeve support cylinder 38 in an airtight manner at the lower surface.

As shown in fig. 2, the drill bushing 40 is disposed opposite the main shaft portion 12. When drilling the workpiece W, the drill bushing 40 presses the workpiece W toward the spindle unit 12.

Fig. 6 is a plan view of the pressing unit.

As shown in fig. 6, an L-shaped round pipe member 42 is attached to the left side of the protruding plate 28B of the base member 23 at a position rearward. The circular tube member 42 extends leftward from the left side surface of the base member 23, and is bent rearward. The rear end of the tubular member 42 is connected to an intake pipe 8 such as a hose, and the inside of the tubular member 42 is evacuated by a pump or the like, not shown.

As shown in fig. 5 and 6, the base member 23 is provided with a communication hole 23a, and the communication hole 23a communicates the lower end opening of the drill bushing support portion 32 with the opening of the round tube member 42 on the base member 23 side. The interior of the drill bushing support portion 32 is made negative by a pump or the like through the communication hole 23a, the circular tube member 42, and the intake pipe 8.

As shown in fig. 3, the sheet holding unit 22 is a unit for holding a sheet (sheet) S (corresponding to a "sandwiching member" of the claims). When the hole is formed in the workpiece W, the sheet S is sandwiched between the drill bushing 40 and the workpiece W (see fig. 2). The sheet S is a film (film) formed of a resin material such as PET (Polyethylene terephthalate) in a band shape. The thickness of the sheet S is, for example, about 100 μm.

The sheet holding unit 22 includes a substrate 45, a sheet storage roll 61 (corresponding to the "2 nd roll" of the claims), a sheet collection roll 62 (corresponding to the "1 st roll" of the claims), and a guide member 50.

As shown in fig. 4, the substrate 45 is formed in a plate shape having a thickness in the front-rear direction. The substrate 45 has: a right plate portion 45a attached to the front surface of the right protruding plate 28A, a left plate portion 45B attached to the front surface of the left protruding plate 28B, and a connecting plate portion 45c connecting the right plate portion 45a and the left plate portion 45B. The right plate portion 45a, the left plate portion 45b, and the connecting plate portion 45c are integrally formed.

As shown in fig. 3, the right plate portion 45a is formed in substantially the same rectangular shape as the right projection plate 28A when viewed from the front-rear direction. A through hole 45d is formed in the right plate portion 45a, and the pin 28A provided in the right protrusion plate 28A is inserted through the through hole 45 d. The right plate portion 45a is disposed along the front surface of the right protruding plate 28A.

The left plate portion 45B is formed in substantially the same rectangular shape as the left protruding plate 28B when viewed from the front-rear direction. A through hole 45e is formed in the left plate portion 45B, and the pin 28B provided in the left protruding plate 28B is inserted through the through hole 45 e. The left plate portion 45B is disposed along the front surface of the left protruding plate 28B.

As shown in fig. 3 and 4, the connecting plate portion 45c connects the left end portion of the upper end edge of the right plate portion 45a and the right end portion of the upper end edge of the left plate portion 45b via the upper side of the base member 23 of the drill bushing supporting unit 21. The connecting plate portion 45c is disposed on the rear side of the cylindrical portion 33 of the drill bushing supporting portion 32.

As shown in fig. 3, the sheet storage roll 61 is configured to be able to wind a strip-shaped sheet S and is connected to one end of the sheet S. The sheet storage roll 61 is wound with the sheet S in an unused state. The sheet storage roll 61 is detachably attached to the front surface of the left plate portion 45 b. The sheet storage roll 61 is attached to be rotatable about an axis along the front-rear direction. The sheet storage roll 61 is disposed such that the center line of the wound sheet S in the width direction coincides with the center axis of the drill bushing support cylinder 38. The sheet storage roll 61 is disposed on the opposite side of the main shaft portion 12 (see fig. 2) with the upper surface 40a of the drill bushing 40 interposed therebetween.

A resistance applying member 66 is provided on the shaft portion 64 that pivotally supports the sheet storage roll 61, and the resistance applying member 66 applies a load to the rotation of the sheet storage roll 61. The resistance applying member 66 includes a ring member 67 externally fitted to the shaft portion 64 and abutting against the front flange portion 61a of the sheet storage roll 61, and a biasing member (not shown) for pressing the ring member 67 from the front to the rear toward the front flange portion 61a of the sheet storage roll 61. The frictional resistance generated between the front flange portion 61a and the ring member 67 applies a rotational load to the sheet storage roll 61, thereby suppressing the loosening of the sheet S fed from the sheet storage roll 61.

The sheet collection roll 62 can wind a strip-shaped sheet S and is connected to the other end of the sheet S. The sheet recovery roll 62 is wound with the used sheet S. The sheet collection drum 62 is detachably mounted on the front surface of the right plate portion 45 a. The sheet collection roll 62 is attached to be rotatable about an axis along the front-rear direction. The sheet collection roll 62 is disposed so that the center line of the wound sheet S in the width direction coincides with the center axis of the drill bushing support 38, similarly to the sheet storage roll 61. The sheet collection reel 62 is disposed on the opposite side of the main shaft portion 12 (see fig. 2) with the upper surface 40a of the drill bushing 40 interposed therebetween, similarly to the sheet storage reel 61.

The sheet collection drum 62 is detachably engaged with an output shaft 30a (see fig. 4) of the drive source 30. The driving source 30 drives the sheet collection drum 62 to rotate, and draws out the sheet S wound around the sheet collection drum 61, and winds the sheet S drawn out from the sheet collection drum 61 around the sheet collection drum 62.

The guide member 50 is a member for guiding the strip-shaped sheet S suspended between the sheet storage roll 61 and the sheet collection roll 62 onto the upper surface 40a of the drill bushing 40. The guide member 50 is attached to the front surface of the linking plate 45c (see fig. 4). The guide member 50 includes a guide member 50A disposed on the right of the drill bushing support portion 32, and a guide member 50B disposed on the left of the drill bushing support portion 32. The right guide member 50A and the left guide member 50B are formed in plane symmetry with respect to an imaginary plane that is perpendicular to the left-right direction and passes through the center axis of the drill bushing supporting cylinder 38. Therefore, in the following description, the right guide member 50A will be described, and the parts of the left guide member 50B corresponding to the right guide member 50A will be given the same reference numerals and will not be described.

The guide member 50A is an L-shaped member formed along the upper end edge and the right end edge of the outer peripheral surface of the drill bushing supporting cylinder 38 when viewed from the front-rear direction. The guide member 50A gradually increases in width from the upper portion toward the lower portion as viewed in the front-rear direction. A concave guide groove 51 through which the sheet S travels is formed on the right surface of the guide member 50A. The guide groove 51 is formed in a range from a lower right portion to an upper end portion of the guide member 50A. The guide groove 51 opens at the upper end of the guide part 50A towards the drill bushing support cylinder 38. The width of the guide groove 51 is formed to be slightly wider than the width of the sheet S. A roller 53 is disposed at the upper end of the guide member 50A. The roller 53 is disposed apart from the bottom surface of the guide groove 51. The rollers 53 are supported by side wall portions on both sides of the guide groove 51 in the front-rear direction, and are rotatable about axes along the front-rear direction. The guide member 50A is disposed such that the center line in the width direction of the guide groove 51 coincides with the center axis of the drill bushing supporting cylinder 38, as viewed from the left-right direction.

Here, as shown in fig. 3 and 4, the sheet holding unit 22 is provided to be detachable from the drill bushing supporting unit 21 (drill bushing 40). The sheet holding unit 22 is fixed to the drill bushing supporting unit 21 by the clamp 9, and the clamp 9 connects the left protruding installation plate 28B of the drill bushing supporting unit 21 and the left plate portion 45B of the sheet holding unit 22. When the sheet holding unit 22 is moved in the vertical direction of the drill bushing supporting unit 21 by a pressing unit moving mechanism (not shown), the sheet holding unit 22 moves integrally with the drill bushing 40.

As shown in fig. 5, the sheet S drawn out from the sheet storage roll 61 travels through the guide groove 51 of the left guide member 50B and passes between the guide groove 51 and the roller 53. Next, the traveling direction of the sheet S is changed upward along the outer peripheral surface of the roller 53, and the sheet S travels while being in sliding contact with the upper surface 40a of the drill bushing 40. The traveling direction of the sheet S having passed through the upper surface 40A of the drill bushing 40 is changed to the downward direction, and the sheet S passes between the guide groove 51 of the right guide member 50A and the roller 53. Next, the sheet S travels in the guide groove 51 and is then wound around the sheet collection roll 62. At this time, a load is applied to the rotation of the sheet storage roll 61 by the resistance applying member 66 (see fig. 4) in the sheet storage roll 61. Therefore, a tension of a degree that does not loosen the sheet S drawn out from the sheet storage roll 61 acts on the sheet S.

Next, the operation of the present embodiment will be explained.

First, the operation of the boring device 1 will be described. Reference numerals of the respective components in the following description refer to fig. 2 to 6. In the following description, a printed circuit board is taken as an example of the workpiece W.

When the drilling device 1 performs drilling of the workpiece W, first, the drill D is moved to a position above a predetermined position with respect to the workpiece W by a workpiece moving mechanism and a carriage moving mechanism, which are not shown. In this case, the position where the hole is to be drilled may be precisely measured by imaging the circuit formation pattern of the workpiece W with an X-ray camera or the like, not shown.

Next, the main shaft portion 12 is moved downward toward the workpiece W by a not-shown main shaft moving mechanism, and the lower end portion of the pressing member 13 is brought into contact with the upper surface of the workpiece W. Further, the pressing unit 20 is moved upward toward the workpiece W by the pressing unit moving mechanism. At this time, the pressing unit 20 passes the drill bushing 40 through a slit 5a formed in the work table 5 and extending in the left-right direction. The pressing unit 20 brings the upper surface 40a of the drill bushing 40 into contact with the lower surface of the workpiece W via the sheet S. By sandwiching the workpiece W vertically by the pressing member 13 and the drill bushing 40 in this manner, the positional displacement of the workpiece W and the deflection of the workpiece W are prevented.

Next, the main shaft portion 12 is further moved toward the workpiece W. At this time, since the lower end portion of the pressing member 13 abuts against the workpiece W, the pressing member 13 moves upward relative to the main shaft portion 12, and the main shaft portion 12 further continues to descend. Thereby, the drill D attached to the lower end of the main shaft portion 12 protrudes downward from the drill hole 13a of the pressing member 13 to open a hole in the workpiece W. At this time, when a new pressing member 13 in which the bit hole 13a is not formed is used, the bit hole 13a is newly formed by the drill D.

The drill D penetrating the workpiece W opens a hole in the sheet S and the drill bushing 40 sandwiched between the drill bushing 40 and the workpiece W. At this time, the workpiece W, the sheet S, and the chips of the drill bushing 40 generated by the hole forming process are sucked by the bushing support portion 32 formed in a negative pressure and conveyed to the outside through the communication hole 23a and the round pipe member 42. In addition, in the case where the drill bushing 40 is an already used drill bushing, the drill D is inserted into an existing hole of the drill bushing 40. Since the drill D is inserted into the hole formed in the drill bushing 40 every time the drilling process is performed, the hole of the drill bushing 40 is in a state in which the hole diameter is enlarged due to slight fluctuation of the drill D.

According to the hole drilling device 1 of the present embodiment, since the sheet S is sandwiched between the drill bushing 40 and the workpiece W when drilling the workpiece W, an opening edge (hereinafter, referred to as a "lower end opening edge") of the workpiece W on the drill bushing 40 side can be covered with the sheet S. Thereby, when the drill D penetrates the workpiece W, the material constituting the workpiece W can be brought into contact with the sheet S to be prevented from being pushed out from the lower end opening edge of the workpiece W into the gap between the hole of the drill bushing 40 and the drill D. Therefore, even if the hole diameter of the drill bushing 40 is enlarged to a predetermined size when the workpiece W is drilled, the occurrence of burrs at the lower end opening edge of the workpiece W can be suppressed without replacing the drill bushing 40. Further, since the sheet S is easily conveyed, an unused sheet S can be easily introduced between the drill bushing 40 and the workpiece W. Therefore, as compared with the case where the drill bushing 40 is replaced in order to suppress the generation of burrs, the generation of burrs can be easily suppressed. Therefore, the drilling device 1 having excellent manufacturing efficiency and capable of suppressing the generation of burrs can be formed.

Further, since the sheet S is formed in a belt shape, the sheet S can be made to run between the drill bushing 40 and the workpiece W. By running the sheet S, the used portion of the sheet S can be moved to the outside from between the drill bushing 40 and the workpiece W, and the unused portion of the sheet S can be introduced and sandwiched between the drill bushing 40 and the workpiece W. Therefore, an unused portion of the sheet S can be introduced between the drill bushing 40 and the workpiece W without interrupting the hole forming process, so that a reduction in manufacturing efficiency can be suppressed.

The punching device 1 further includes a sheet holding unit 22, and the sheet holding unit 22 is detachably attached to the drill bushing 40. Therefore, after the sheets S wound around the sheet storage roll 61 and the sheet collection roll 62 (hereinafter, referred to as "rolls 61 and 62") are used, the

rolls

61 and 62 can be collectively replaced with respect to the sheet holding unit 22. Therefore, the time for interrupting the drilling process can be shortened, and the reduction of the manufacturing efficiency can be suppressed.

Further, since the sheet holding unit 22 moves integrally with the drill bushing 40, the sheet S can be prevented from being drawn out from the

respective reels

61, 62 and slackened along with the movement of the drill bushing 40. Therefore, for example, it is possible to prevent a problem that the sheet S is pinched between the drill bushing 40 and the workpiece W in a loose state and the drill bushing 40 cannot properly press the workpiece W. Therefore, the hole drilling of the workpiece W can be performed precisely.

Further, since the sheet collection reel 62 is driven to rotate by the drive source 30 so that the sheet S wound on the sheet collection reel 61 is wound by the sheet collection reel 62, the running of the sheet S between the drill bushing 40 and the workpiece W can be automatically and easily performed. The punching device 1 further includes a resistance applying member 66, and the resistance applying member 66 applies a load to the rotation of the sheet storage roll 61. Therefore, when the sheet S is taken out from the sheet storage roll 61 by the rotation of the sheet collection roll 62, the sheet S taken out from the sheet storage roll 61 can be prevented from being loosened due to the excessive rotation of the sheet storage roll 61 by the inertial force. Therefore, the hole-drilling of the workpiece W can be performed accurately while improving the manufacturing efficiency.

Further, since the

reels

61 and 62 are disposed on the opposite side of the main shaft portion 12 with respect to the upper surface 40a of the drill bushing 40, the positions at which the

reels

61 and 62 are disposed can be set without considering the problem of contact with the workpiece. Therefore, for example, the sheet holding unit 22 can be downsized by disposing the

respective rolls

61 and 62 close to each other.

The present invention is not limited to the above-described embodiments described with reference to the drawings, and various modifications are conceivable within the technical scope thereof.

For example, in the above embodiment, the sheet S is formed in a band shape and runs between the drill bushing 40 and the workpiece W, but the present invention is not limited thereto. For example, the sheet may be formed in a long shape and appropriately supplied from a cassette or the like between the drill bushing 40 and the workpiece W.

In the above embodiment, the punching device 1 presses the upper surface of the workpiece W by the pressing member 13 when punching the workpiece W, but the punching device is not limited to this, and the punching device may not have the pressing member.

In the above embodiment, PET is exemplified as the material forming the sheet S, but the present invention is not limited thereto. Examples of the material for forming the sheet S include polyethylene, polyamide, polyimide, polycarbonate, polypropylene, polyurethane, polyphenylene sulfide, polyarylethersulfone, polyetheretherketone, polyetherimide, polytetrafluoroethylene, and an aluminum deposited film.

In addition, the components in the above embodiments may be replaced with known components as appropriate without departing from the scope of the present invention.

Claims

1. A perforating device is characterized in that a perforating device is arranged,

the tapping device has:

a drill for drilling a hole in a workpiece;

a bit holding portion that holds the bit rotatably;

a support member that is disposed opposite to the drill holder and presses the workpiece toward the drill holder when drilling the workpiece;

a sheet-like sandwiching member that is sandwiched between the support member and the workpiece when the workpiece is bored; and

a pressing member that presses the workpiece toward the support member when the workpiece is bored,

the support member is supported by a support member support portion formed in a cylindrical shape, and the support member support portion formed in a negative pressure sucks cutting chips from the workpiece, the interposed member, and the support member, which chips are generated when the workpiece is bored.

2. The tapping device of claim 1 wherein,

the interposed member is formed in a band shape.

3. The tapping device of claim 2 wherein,

the hole-opening device further has a sandwiched member holding unit,

the interposed member holding unit includes:

a 1 st reel on which the intermediate member can be wound, the 1 st reel being connected to one end of the intermediate member; and

a 2 nd reel on which the intermediate member can be wound and which is connected to the other end of the intermediate member,

the interposed member holding unit is provided to be detachable from the support member.

4. The tapping device of claim 3 wherein,

the interposed member holding unit moves integrally with the support member.

5. The tapping device according to claim 3 or 4,

the tapping device further has:

a drive source that drives the 1 st reel to rotate so that the 1 st reel winds the interposed member wound on the 2 nd reel; and

a resistance applying member that applies a load to rotation of the 2 nd reel.

6. The tapping device according to claim 3 or 4,

the 1 st reel and the 2 nd reel are disposed on the opposite side of the bit holding portion with respect to the bit holding portion side surface of the support member.