JP4152938B2 - Scribing equipment - Google Patents

Description

  The present invention relates to a scribing apparatus that forms engraved lines on a work surface of a brittle material such as plate glass or ceramics.

  Generally, in order to break a plate made of a brittle material, a score line is formed in advance on the surface of the workpiece, and the sheet is broken along the score line. A conventional scribing device is disclosed, for example, in Japanese Utility Model Laid-Open No. 1-110234. The scribing device includes a disc-shaped cutter with a sharp edge, a holder that rotatably supports the cutter, and a press that moves the cutter along the surface of the plate glass while pressing the cutter against the surface of the workpiece via the holder. And a moving mechanism.

In the apparatus having the above-described configuration, the engraving line is formed by moving the cutter while pressed against the plate glass. However, there is the following problem. That is, when the pressing force for pressing the cutter against the glass sheet is increased, the score line is formed deeply and the sheet glass is easily broken. There arises a problem that chipping or peeling occurs. On the other hand, if the pressing force of the cutter on the plate glass is reduced, horizontal cracks will not occur, but the depth of the vertical cracks will become shallow, and the plate glass will not be broken well.

In order to solve the above problems, the present invention provides (a) a body having an abutting portion, (a) a holder having an abutting portion, and (c) an abutting portion of the body and an abutting portion of the holder. And (d) a vibration actuator that is held at the end of the holder and transmits the vibration applied to the holder from the vibration actuator to the workpiece. A contact member; (e) a support member that applies a preload to the vibration actuator; and (f) a slide support portion that is slidable in the vibration direction of the vibration actuator and is supported by the body . a scribing apparatus, the body and the holder and the vibration actuator is arranged coaxially to the center axis of the vibration actuator, the contact portion of the contact portion and the holder of the body is placed Together, characterized in that the slide support portion is disposed.

Preferably, the contact member is also disposed on the central axis of the vibration actuator.
Preferably, the support member is made of an elastic member that urges the holder toward the vibration actuator, and the elastic member is disposed on the central axis of the vibration actuator.
Preferably, the support member and the slide support portion is opposed to the vibration direction between the vibration actuator.

  Preferably, the body is elongated and has a vertically long accommodating space, the holder is also elongated and has a vertically elongated accommodating space, and the holder is accommodated in the accommodating space of the body, and the vibration actuator Is accommodated in the accommodating space of the holder.

  Preferably, a bottom surface of the housing space of the holder is provided as the contact portion that receives the vibration actuator, and the contact portion of the body faces the contact portion of the holder in the housing space of the holder.

  According to the present invention, good scribing can be performed.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 3, the scribing apparatus includes a moving table 1 (support table, only shown in FIG. 2), and a moving mechanism 2 (shown only in FIG. 2) that moves the moving table 1 in the horizontal direction. The slide mechanism 4 attached to the movable table 1 via the base plate 3, the body 10 supported by the slide mechanism 4 so as to be movable in the vertical direction, and enabling the body 10 to slide in a small amount in the vertical direction. A holder 20 supported in this manner, a cutter 30 (head, contact member) provided at the lower end of the holder 20, and two piezo actuators 40 (vibration actuators) for applying vertical vibration to the holder 20. I have.

  The moving mechanism 2 moves the moving table 1 horizontally in the left-right direction in FIG. 1 and in the direction orthogonal to the paper surface in FIG. The slide mechanism 4 has a guide 5 fixed to the base plate 3 and a slider 6 supported by the guide 5 so as to be slidable in the vertical direction. The lower limit position of the slider 6 is determined by a stopper (not shown) provided on the guide 5.

  The body 10 is supported on the slider 6 via four leaf springs 7 (vibration buffer members having elasticity). Details will be described below. Brackets 8 and 9 are fixed to the upper and lower ends of the slider 6, respectively. As shown in FIG. 6, the upper bracket 8 has a plate-shaped mounting portion 8a fixed to the slider 6, and U-shaped spring fixing portions 8b provided on the left and right sides of the mounting portion 8a and extending forward. is doing. As best shown in FIG. 2, both ends of a leaf spring 7 extending in the front-rear direction are fixed to the upper surfaces of the front and rear ends of these spring fixing portions 8b. Similarly, the lower bracket 9 has an attachment portion 9a and a pair of left and right spring fixing portions 9b (see FIG. 7), and a leaf spring 7 extending in the front-rear direction on the upper surfaces of the front and rear ends of these spring fixing portions 9b. Both ends are fixed (see FIG. 2).

  On the other hand, the body 10 has a box shape elongated in the vertical direction, and spring fixing portions 11 protrude from left and right side surfaces of the upper end portion. The centers of the upper pair of leaf springs 7 are fixed to the upper surfaces of these spring fixing portions 11. In addition, an overhanging portion 12 is formed at the lower end portion of the body 10 so as to project from side to side. The spring fixing portion 13 protrudes from the lower surface of the center of the overhanging portion 12 in the front-rear direction, and the center of the lower leaf spring 7 is fixed to the spring fixing portion 12. Each of the four leaf springs 7 has a bent portion 7a between the central fixed portion and the fixed portions at both ends.

  The body 10 has a vertically long storage space 15 that is open at the front and the bottom, and has a substantially U-shaped cross section. The holder 20 is stored in the storage space 15. The holder 20 has an elongated box shape extending vertically, and has a storage space 25 having an open rear side, and has a substantially U-shaped cross section. The holder 20 is coaxial with the body 10. The center axes of the body 10 and the holder 20 are indicated by L in the figure.

  As best shown in FIGS. 4 and 5, the two piezoelectric actuators 40 are accommodated in the accommodating space 25 of the holder 20 so as to be coaxial with the body 10 and the holder 20. Each actuator 40 is formed in an elongated shape with a square cross section, and generates an axial vibration. The two piezoelectric actuators 40 are directly connected to each other, and the lower end surface of the lower piezoelectric actuator 40 is in contact with the bottom surface 25 a (contact portion) of the storage space 25 of the holder 20.

  A mounting hole 18 is formed in the left side wall of the body 10. Air from a nozzle (not shown) connected to the mounting hole 18 enters the storage space 15 and further enters the storage space 25 of the holder 20 and is blown to the piezo actuator 40 to cool the piezo actuator 40. It has become. The left and right walls and the rear wall of the body 10 and the left and right walls and the front wall of the holder 20 are respectively formed with holes 19 and 29 serving as air passages and outlets.

  The holder 20 is supported by the body 10 by a support mechanism such that the holder 20 can move in a small amount in the direction (vibration direction) along the central axis L. This support mechanism includes a first support portion 50 (slide support portion) disposed above the piezo actuator 40 and a second support portion 60 disposed below the piezo actuator 40.

  As shown in FIG. 4, the first support portion 50 is attached to a slide hole 51 (slide portion of the holder 20) having a circular cross section formed through the upper wall of the holder 20 and the upper wall of the body 10. The guide member 52 is provided. The guide member 52 has a mounting portion 52a that has a flat plate shape and is fixed to the upper end surface of the body 10, and a cylindrical portion 52b (a guide portion and a convex portion of the body 10) that protrudes downward from the mounting portion 52a. ing. The cylindrical portion 52b passes through the upper wall of the body 10 and is inserted into the slide hole 51 with a slight clearance. Thereby, the upper end part of the holder 20 is supported by the body 10 so that a slide is possible. Since the slide hole 51 and the cylindrical portion 52 b of the guide member 52 are coaxial with the body 10, the slide direction of the holder 20 coincides with the vibration direction of the piezo actuator 40.

  A screw hole 52x is formed in the guide member 52, and an adjusting screw 55 (preload adjusting means) that performs an adjusting action described later is screwed into the screw hole 52x. A lower end portion 55 a (front end portion) of the adjustment screw 55 abuts on an upper end surface of the upper piezoelectric actuator 40 via the receiving plate 56 and is provided as a contact portion of the body 10. The lower end portion 55a of the adjusting screw 55 has a convex spherical surface, and is in contact with the receiving seat 56a formed of a concave spherical surface of the receiving plate 56. The lower end portion 55a of the adjustment screw 55 is opposed to the bottom surface 25a of the storage space 25 of the holder 20 in the vertical direction (the direction along the central axis L), and the piezo actuator 40 is sandwiched between them. Are arranged. A lock nut 57 for fixing the adjustment screw 55 is screwed onto the adjustment screw 55.

  As shown in FIG. 4, the second support portion 60 includes a leaf spring 61 and a spherical ball 62 made of an elastic material such as rubber or resin as elastic members (support members). Both ends of the plate spring 61 are fixed to the upper surface of the overhanging portion 12 of the body 10, and the center thereof is fixed to the lower end surface of the tapered spring fixing portion 21 formed in the holder 20 with a screw 63. Has been. The centers of the spring fixing portion 21 and the leaf spring 61 are disposed on the central axis L of the body 10, the holder 20, and the piezo actuator 40. The said leaf | plate spring 61 has the bending part 61a between the center fixed location and the both ends fixed location.

  The ball 62 is interposed between the head of the screw 63 (ball contact portion of the holder 20) and the receiving plate 64 (ball contact portion of the body 10). The receiving plate 64 is fixed so as to be bridged between the lower end surfaces of the left and right projecting portions 12 of the body 10. The head and the receiving plate 64 are respectively formed with receiving seats 63a and 64a having concave spherical surfaces, and the ball 62 is fitted between the receiving seats 63a and 64a. The center of the screw 63 and the receiving plate 64 and the ball 62 are arranged on the central axis L of the piezo actuator 40 and the like.

  Next, the attachment structure of the cutter 30 will be described. The holder 20 is divided into two forks from the spring fixing portion 21 and extends downward. The leaf spring 61, the ball 62, and the receiving plate 64 are disposed between the pair of extension portions 22. A first attachment 71 is connected to the lower end (tip) of the extension portion 22 of the holder 20, and a second attachment 72 is connected to the first attachment so that the connection angle can be adjusted. A storage hole 72 a is formed in the lower surface of the second attachment 72, and the cutter 30 is stored in the storage hole 72 a and is detachably fixed with a screw 73.

  The cutter 30 is disposed on the central axis L of the piezo actuator 40, and its lower end (tip) has a conical shape and is pointed. A diamond grain having a pyramid shape is fixed to the lower end of the cutter 30. The apexes of the diamond grains face downward and come into contact with the surface of a plate glass 100 (work) described later.

  A guide plate 35 is attached to the attachment 72. The guide plate 35 is made of a U-shaped spring material and is fixed to both side surfaces of the attachment 72. As shown in FIGS. 1 and 2, a hole 35 a is formed in the central portion of the guide plate 35. The lower end of the cutter 30 protrudes downward from the guide plate 35 by a predetermined amount through the hole 35a.

  As shown in FIGS. 1 and 3, an air cylinder 80 (push-up mechanism) is vertically attached to the base plate 3. On the other hand, an L-shaped bracket 85 is fixed to the side surface of the body 10, and a vertical short rod 86 is screwed to the bracket 85. The short rod 86 and the upper end of the rod 81 of the air cylinder 80 face each other.

  The operation of the scribing apparatus having the above configuration will be described. When the adjusting screw 55 is screwed in, the piezo actuator 40 and the holder 20 are moved downward. Along with this, a downward force is applied to the leaf spring 61 via the spring fixing portion 21, and via the screw 63. Thus, a downward force is also applied to the ball 62. Since both ends of the leaf spring 61 are fixed to the overhanging portion 12 of the body 10, the leaf spring 61 is elastically deformed by the downward force. Further, since the ball 62 is received by the receiving plate 64 fixed to the body 10, the ball 62 is elastically compressed and deformed. The elastic restoring force of the leaf spring 61 and the ball 62 becomes a force for urging the holder 20 upward with respect to the body 10. As a result, the bottom surface 25a of the storage space 25 of the holder 20 is urged toward the piezo actuator 40. Force in the direction of compressing 40 in the axial direction). As the screwing amount of the adjusting screw 55 is increased, the preload to the piezoelectric actuator 40 is increased. After the preload adjustment with the adjustment screw 55 is completed, the lock nut 57 is tightened to prevent the adjustment screw 55 from loosening.

  Using the scribe device that has been subjected to the preload adjustment, a score line is formed on the plate glass 100 (work) set on the horizontal installation table 90. In the initial state, the cutter 30 of the scribing device is separated from the edge of the plate glass 100 in the horizontal direction, and is in a lower limit position (a position corresponding to the lower limit position of the slider 6). In this state, when the moving mechanism 2 is driven to move the moving table 1 in the horizontal direction, the body 10, the holder 20, and the cutter 30 move together in the same direction. Then, the guide plate 35 attached to the holder 20 hits the edge of the plate glass 100 and is guided by the guide plate 35, so that the cutter 30 is placed on the upper surface of the plate glass 100.

  As described above, in the state where the cutter 30 is placed on the upper surface of the plate glass 100, a pressing force against the upper surface of the plate glass 100 is always applied to the cutter 30. This pressing force is due to the weight of the body 10, the holder 20, the slider 6, and the like. The pressing force can be adjusted by attaching a weight 95 to the body 20 so as to be detachable.

  As described above, scribing is performed in a state where the cutter 30 is pressed against the surface of the plate glass 100 by its own weight such as the body 10. That is, the moving base 1 is moved by the moving mechanism 2 to move the cutter 30 along the plate glass 100, and a high-frequency voltage is applied to the piezo actuator 40 so that the piezo actuator 40 is periodically expanded and contracted in the axial direction. Then, the vibration of the holder 20 accompanying the periodic expansion and contraction is transmitted to the plate glass 100 through the cutter 30. As a result, engraved lines having deep vertical cracks can be formed. However, since the pressing force due to the gravity of the body 10 or the like is relatively small, the occurrence of horizontal cracks as in the conventional apparatus can be almost eliminated.

  In the present embodiment, two piezo actuators 40 are connected and a synchronized high frequency voltage is applied to generate a vibration having twice the amplitude as compared to the case of using one piezo actuator 40. Even if the glass sheet 100 is thick, it is possible to form engraved lines with a sufficient depth. The frequency of the high frequency voltage applied to the piezo actuator 40 is set to about 3 to 30 KHz according to the material, hardness, thickness, etc. of the plate glass 100.

  In the process of forming the engraving line, the cutter 30 is always in contact with the surface of the plate glass 100 with the pressing force associated with the weight of the body 10 or the like, and is not instantaneously separated from this surface. Defects can be eliminated and clean markings can be formed. Further, since the holder 20 is a rigid body and the cutter 30 is attached to the holder 20 without interposing an elastic body, the cutter 30 vibrates integrally with the holder 20 and the vibration energy of the piezoelectric actuator 40 is satisfactorily cut. 30.

  In the present embodiment, the piezo actuator 40 and the holder 20 are coaxial, and the cutter 30 is positioned on the center axis L thereof, so that the vibration of the piezo actuator 40 can be efficiently transmitted to the cutter 30. As described above, since the piezo actuator 40 is preloaded by the elastic restoring force of the leaf spring 61 and the ball 62, it is not affected by the reaction force of the workpiece 100, and the vibration of the contact member is expanded and contracted by the piezo actuator. And can be scribed with stable vibration.

  The holder 20 is slidably supported on the body 10 by a first support portion 50 disposed above the piezo actuator 40, but the distance of this slide support is short, and the cylindrical portion 52b and the slide hole 51 are simple. It has a simple structure. Instead, the holder 20 is elastically supported by the leaf spring 61 and the ball 62 of the second support portion 60 disposed below the piezo actuator 40 so that the holder 20 can move a small amount in the vibration direction (sliding direction). Can be supported. Since the second support portion 60 is disposed between the piezo actuator 40 and the cutter 30, even if the holder 20 is laterally shaken, the lateral shake of the cutter 30 can be minimized. Note that the above-mentioned slide support is a simple configuration of the slide hole 51 and the cylindrical portion 52b, and it is not necessary to use a conventional slide mechanism composed of a rolling bearing. Therefore, durability can be ensured even if the holder 20 reciprocates several hundred thousand times per minute over a distance of several microns.

  As described above, the leaf spring 61 and the ball 62 have a role of providing a preload to the piezoelectric actuator 40 and a role of elastic support of the holder 20. The ball 62 also serves to avoid resonance and prevent the cutter 30 from splashing up from the glass sheet 100. The leaf spring 61 also serves as a detent for the holder 20. Even if both ends of the leaf spring 61 are fixed, the leaf spring 61 has a bent portion 61a between the center fixing portion and the both ends fixing portion. Makes the vibration easier.

  In the present embodiment, the leaf spring 7 is also interposed between the body 10 and the slider 6 to buffer the vibration transmitted from the vibration actuator 40 to the body 10, so that the possibility of resonance can be further reduced. It is possible to prevent the contact member 30 from jumping up from the work 100 and to perform stable scribing. At this time, since the slider 6 can be moved by the vibration transmitted from the body 10 via the leaf spring 7, it is not necessary to apply a large reaction force to the body 10, so that the possibility of resonance is minimized. be able to. Moreover, since the leaf spring 7 has the bent portion 7a, the relative movement amount of the body 10 with respect to the slider 6 can be made relatively large, and vibration damping can be performed more satisfactorily. The four leaf springs 7 are arranged in pairs on the left and right sides of the body 10, and at least two pairs of leaf springs 7 that are separated from each other in the vertical direction are arranged. Thus, a minute amount movement (vibration) vibration of the body 10 at the time of scribing is performed along the vibration axis of the actuator 40 (the central axis L of the body 10). From this point, scribing can be performed stably. Further, since the center of the four leaf springs 7 and the central axis L of the body 10 are arranged on the same plane, the body 10 can be stably supported also from this point.

  When the formation of the engraving on the plate glass 100 by the cutter 30 is completed, the energization to the piezo actuator 40 is stopped, the air cylinder 80 is driven, the body 10 is pushed upward, and the cutter 30 is separated from the workpiece 100. Then, the plate glass 100 is removed from the installation table 90. Thereafter, the moving base 1 is returned to the initial position, and the air cylinder 70 is driven in the reverse direction to return to the state of FIG. 1, that is, the state where the upper end of the rod of the air cylinder 80 is separated from the short rod 86. Return to the lower limit position. The plate glass 100 on which the engraved lines are formed as described above is broken along the engraved lines by a breaking device (not shown).

  In addition, this invention is not restrict | limited to the said embodiment, A various aspect is possible. For example, the air cylinder may be indirectly fixed to the support 1 and the rod tip may be connected to or abutted with the slider 6. The air cylinder urges the slider 6 and the body 10 toward the work surface. In this case, the body 10 and the holder 20 shown in FIG. 1 can be tilted horizontally, and scribing can be performed with the work surface vertical.

  The support table 1 that supports the body 10 may be fixed at a predetermined position without being moved horizontally, the moving mechanism 2 may be connected to the installation table 90, and the plate glass 100 installed on the installation table 90 may be moved. In the above-described embodiment, a cutter having a conical shape or a pyramid shape is used, but a disc-shaped cutter may be used. In this case, a part of the peripheral edge of the cutter is provided as a sharp tip that hits the workpiece. The movement of the body with respect to the workpiece or the movement of the workpiece with respect to the body may be performed by the operator's hand, or the pressing force may be applied to the cutter through the body by the operator's hand. Either the leaf spring 61 or the ball 62 of the second support part 60 may be omitted. The first support part 50 (slide support part) may be omitted. In this case, the flat upper end surface of the piezo actuator 40 and the surface of the contact portion of the body 10 may be brought into contact with each other so as to be orthogonal to the central axis of the piezo actuator with high accuracy.

It is a front view of the scribe device which constitutes one embodiment of this invention. It is a side view of the scribing apparatus. It is a top view of the scribing apparatus. It is a longitudinal cross-sectional view of the scribing apparatus along line IV-IV in FIG. In FIG. 1, it is a cross-sectional view of the scribing device along the line V-V. It is a perspective view which shows the upper side bracket for supporting the leaf | plate spring for a buffer. It is a perspective view which shows the lower bracket for supporting the leaf | plate spring for a buffer.

Explanation of symbols

10 Body 20 Holder 25 Bottom of storage recess (holder contact part)
30 cutter (contact member)
40 Piezo actuator (vibration actuator)
50 1st support part (slide support part)
51 Slide hole (slide part of holder)
52b Cylindrical part (body guide part, convex part)
55 Adjustment screw (Preload adjustment means)
55a Tip of adjustment screw (body contact part)
60 Second support portion 61 Leaf spring (elastic member, support member)
61a bending part 62 ball (elastic member, support member)

Claims (6)

(A) a body having a contact portion;
(A) a holder having a contact portion;
(C) a vibration actuator that is supported between the contact portion of the body and the contact portion of the holder, and generates vibration in the opposite direction of the contact portion;
(D) an abutting member that is held at an end of the holder and transmits vibration applied to the holder from the vibration actuator to the workpiece;
(E) a support member for applying a preload to the vibration actuator;
(F) a slide support portion for allowing the holder to slide in the vibration direction of the vibration actuator and supporting the body;
A scribing device comprising:
The body, the holder, and the vibration actuator are coaxially arranged, and on the central axis of the vibration actuator, the contact portion of the body and the contact portion of the holder are disposed, and the slide support portion is disposed. A scribing device.   The scribing apparatus according to claim 1, wherein the contact member is also disposed on a central axis of the vibration actuator.   The said support member consists of an elastic member which urges | biases the said holder toward the said vibration actuator, and this elastic member is arrange | positioned on the center axis line of the said vibration actuator. Scribe device. The scribing device according to any one of claims 1 to 3, wherein the support member and the slide support portion oppose each other in the vibration direction between vibration actuators. The body is elongated in the vibration direction and has a vertically long accommodating space, the holder is also elongated in the vibration direction and has a vertically long accommodating space, and the holder is accommodated in the accommodating space of the body. The scribing device according to claim 1, wherein the vibration actuator is housed in a housing space of the holder.   The bottom surface of the storage space of the holder is provided as the contact portion that receives the vibration actuator, and the contact portion of the body faces the contact portion of the holder in the storage space of the holder. The scribing device according to claim 5.

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