JP2012076368A - Scribing head and method for setting reference angle thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scribing head in which the reference angle of a motor for changing the angle of a scribe line can be easily set when the scribe line is curved.SOLUTION: An encoder 32 is attached to the turning motor 31, so that rotational force of the turning motor is transmitted to a kingpin 51 to which a scribing wheel is attached via a clutch plate 41. Since the clutch plate 41 has a pair of projection parts disposed linearly, the direction is set by a reset bar 70 having a lateral-side groove and the set direction is used as the reference angle.

Description

  The present invention relates to a scribe head used in a scribe device, and more particularly to a scribe head capable of easily setting a reference angle in a scribe head capable of rotating the direction of a holder joint and a reference angle setting method thereof. .

  Conventionally, in a flat panel display (FPD) such as a liquid crystal display panel or a liquid crystal projector substrate, a mother glass substrate is bonded together in a manufacturing process, and then divided into a single panel of a predetermined size. For dividing a brittle material substrate such as a mother glass substrate, there are a scribing process and a breaking process, and a scribing apparatus is used in the scribing process. In manufacturing an FPD, a single mother substrate is scribed, and a plurality of panel substrates are taken out by a breaking process.

  In the scribe device, for example, as shown in Patent Documents 1 and 2, a table for placing and holding a brittle material substrate and a horizontal direction relative to the brittle material substrate can be moved in the vertical direction. Also, a movable scribe head is provided. A holder joint is attached to the lower end of the scribe head. The holder joint rotatably holds a scribing wheel (hereinafter also simply referred to as a cutting edge) at its lower end.

  Now, a bonded substrate 100 such as a liquid crystal panel shown in FIG. 1A is configured by bonding upper and lower glass substrates 101 and 102. When a single panel is cut out from the bonded substrate 100, the positions of the upper and lower scribe heads are usually aligned with respect to the rectangular portion so as to be simultaneously scribed. However, as shown in FIG. 1B and an enlarged side view of the circular portion in FIG. 1A, and in FIG. 1C, the end portion of the bonded substrate 100 is formed on the lower glass substrate 102. The electrode needs to be exposed. Therefore, the surface of the upper glass substrate 101 is cut smaller. In this case, scribing is required in which the scribe lines of the upper glass substrate 101 and the scribe lines of the lower glass substrate 102 are slightly different. Even when the scribe lines are shifted as described above, it is necessary to scribe the scribe lines of the upper and lower glass substrates 101 and 102 from the end of the mother substrate to the inner end of the outer seal 103. For example, if the upper and lower scribe lines are L1 and L2 in FIG. When entering further inside the outer seal 103, the upper scribe line L1 advances as it is, and only the lower scribe head is meandered so that it is slightly displaced from the upper scribe head and scribed along the scribe line L2. If scribing is performed in this manner, the electrode formed on the lower glass substrate 102 can be exposed by a subsequent breaking process.

  At this time, conventionally, the shaft of the holder joint is held freely by a ball bearing so that the shaft can rotate freely, and the direction of the cutting edge is changed by the caster effect by changing the moving direction of the scribe head to meander the scribe line.

WO2008-149515 WO2009-154022

  Thus, in the conventional scribing device, the direction of the blade edge is changed by the caster effect, so that there is a drawback that the running distance until the scribing in a desired direction becomes long. There is also a drawback that the trajectory of the scribe line becomes uncertain.

  The present invention has been made paying attention to such a conventional problem, and a holder joint to which a cutting edge is attached is rotated by a motor to shorten a useless scribe distance and easily set a reference angle thereof. The purpose is to be able to.

  In order to solve this problem, a scribe head of the present invention includes a base plate, a swing motor to which an encoder is connected, a rotational force transmission mechanism that transmits the rotational force of the swing motor, and a scribing wheel attached to a lower end. A holder joint having a king pin that rotates along its axis by the rotational force transmitted by the rotational force transmission mechanism; and a holder flange that holds the holder joint. The rotational force transmission mechanism is provided by the turning motor. A shaft that is rotationally driven, a clutch plate that has a pair of protrusions in a straight line, is attached to the shaft and rotates together with the shaft, and transmits the rotational force to the king pin, and the base plate has a shaft A reset bar having a groove along the tip and a notch at the tip of the clutch Positioning means for positioning the tip of the reset bar when inserted so as to fit into the protrusion of the rate, and the holder flange is positioned at a side wall corresponding to the pair of protrusions of the clutch plate. It has a through hole.

  Here, a bottom cover that covers the holder flange may be provided, and a through hole may be provided at a position corresponding to the protruding portion of the clutch plate of the bottom cover.

  Here, an openable / closable plate may be provided in the through hole of the bottom cover.

  In order to solve this problem, the scribing head reference angle setting method of the present invention, in the scribing head, insert a reset bar having a groove along the axis so as to fit into the protruding portion of the clutch plate, The tip of the reset bar is held in contact with the positioning means of the base plate, and the value of the encoder indicating the current angle of the swing motor is set as a reference angle.

  According to the present invention having such characteristics, before attaching the holder joint to the scribe head, the reference angle of the swing motor is set by inserting the reset bar and setting the reference angle so that the clutch plate is at a predetermined angle. Can be set. Thereafter, the direction of the cutting edge can be actively changed during scribing by rotationally driving the turning motor. For this reason, when scribing a bonded substrate, the upper and lower cutting edges are placed in the same position, the external seal part is scribed, and the part where the electrodes need to be exposed is scribed by shifting the upper and lower scribe lines. It is possible to obtain an effect that the control can be performed. In addition, since the direction of the cutting edge can be freely controlled, the trajectory of the scribe line is more stable than when changing the direction of the cutting edge by the caster effect, and the effect of being able to scribe in a desired direction at a short distance can be obtained.

FIG. 1 is a diagram showing scribe of a bonded substrate. FIG. 2 is a perspective view showing an example of a scribe head according to the embodiment of the present invention. FIG. 3 is a central longitudinal sectional view of the scribe head according to the present embodiment. FIG. 4 is a perspective view showing the bottom plate 13 according to the present embodiment. FIG. 5 is a plan view and a partial cross-sectional view of the bottom plate 13 according to the present embodiment. FIG. 6 is a perspective view of the slider according to the present embodiment. FIG. 7 is a perspective view and a sectional view showing a holder flange according to the present embodiment. FIG. 8 is a perspective view showing peripheral portions of the spline shaft and the holder bracket according to the present embodiment. FIG. 9 is a sectional view showing a peripheral portion of the spline shaft and the holder bracket according to the present embodiment. FIG. 10 shows a clutch plate according to the present embodiment. FIG. 11 is a side view and a sectional view of the holder joint according to the present embodiment. FIG. 12 is a plan view, a cross-sectional view, a side view, and a perspective view showing a connecting boss according to this embodiment. FIG. 13A is a plan view showing a bottom cover according to the present embodiment, FIG. 13B is a sectional view, FIG. 13C is a side view, and FIG. FIG. 14 is a diagram showing a reset bar according to the present embodiment. FIG. 15 is a cross-sectional view showing a state in which the reference angle of the swing motor is set in the present embodiment.

  FIG. 2 is a perspective view showing an example of a scribe head according to an embodiment of the present invention, and FIG. 3 is a central longitudinal sectional view of the scribe head. As shown in these drawings, the scribe head has a rectangular base plate 11 that is vertically attached to a bridge (not shown). A top plate 12 is provided horizontally above the base plate 11, and a bottom plate 13 is provided parallel to the top plate 12 below the base plate 11. A servo motor 14 is fixed on the top of the top plate 12 with its rotational axis facing downward. In addition, an encoder 15 for detecting the rotation angle is provided on the servo motor 14. As shown in FIG. 3, a shaft 17 a of a ball screw 17 is attached to the motor shaft of the servo motor 14 via a coupling 16. A slider 18 is attached to the base plate 11 between the top plate 12 and the bottom plate 13 via a linear way 19 so as to be movable up and down. A nut portion 17 b of a ball screw 17 is attached to the slider 18, and the slider 18 can be moved up and down as the servo motor 14 rotates. A holder bracket 20 is attached to the lower end of the slider 18, and a holder flange 21 is attached to the lower end of the holder bracket 20. Here, the base plate 11 is formed with a pin 11a protruding toward the bottom plate 13 at the center of the lower end. This pin 11a constitutes a positioning means for positioning the tip of a reset bar described later.

  Next, each member will be described in more detail. 4A and 4B are perspective views showing the bottom plate 13 viewed from above and below, and FIGS. 5A and 5B are a plan view and a partial cross-sectional view thereof. The bottom plate 13 is a flat plate-like member, and has a protruding portion 13a formed along the side surface at one end. The bottom plate 13 is screwed to the base plate 11 by a screw hole provided in the protruding portion 13a. Connected vertically. A rectangular through hole 13b is formed adjacent to the protrusion 13a. A pair of side walls 13c and 13d parallel to the longitudinal direction of the bottom plate 13 is formed at the other end of the bottom plate 13, and screw grooves are provided on the top surfaces of the side walls 13c and 13d. A circular through-hole 13e is formed in the center of the bottom plate 13, a recess 13f is provided on the bottom side thereof, and an upper surface of a holder flange 21 described later is fitted into the recess 13f. Further, a step 13g having a small diameter is formed immediately above the recess 13f.

  6A and 6B are perspective views showing the slider 18 as viewed from above and below. As shown in the figure, the slider 18 is a housing-like member having an opening on the front surface, and a U-shaped notch 18a through which the ball screw 17 passes is formed on the upper surface. Further, a through hole 18b for rotatably holding a spline shaft, which will be described later, screw grooves 18c, 18d for connecting the holder bracket 20 and the like are formed on the lower surface of the slider 18.

  In this embodiment, as shown in FIG. 3, the holder bracket 20 passes through the through hole 13 b provided in the bottom plate 13, and the upper slider 18 and the holder flange 21 are connected via the holder bracket 20. ing.

  The holder flange 21 is a cylindrical member as shown in a perspective view in FIG. 7A, a central longitudinal sectional view in FIG. 7B, and a perspective view in FIG. 7C, and has a flange portion 21a at one end of the upper surface. It is formed. A pair of through holes 21b and 21c are formed in the flange portion 21a, and are fixed to the lower end of the holder bracket 20 by screws. A metal collar 23 is attached to the cylindrical portion below the holder flange 21. A holder joint 50 is press-fitted and fixed to the inner wall of the metal collar 23. Further, as shown in the drawing, planar cutouts 21d and 21e are formed in the annular portion on the side of the flange portion 21a of the holder flange 21 and a screw groove directed toward the center is formed in the central portion. ing. Further, through holes 21f and 21g having a central axis perpendicular to the surface of the base plate 11 are formed immediately below the annular portion.

  Next, a mechanism for rotating the direction of the scribing wheel is attached to the bottom plate 13. As shown in FIG. 3, a swing motor 31 is fixed to the upper portion of the bottom plate 13 with its rotating shaft directed downward. Specifically, the housing that houses the turning motor 31 is fixed to the screw grooves on the top surfaces of the side walls 13c and 13d of the bottom plate 13 by screws or bolts. An absolute encoder 32 for detecting the rotation angle is provided on the upper part of the swing motor 31. A gear 33 is fixed to the output shaft of the turning motor 31. The gear 33 is positioned in a space between the side walls 13 c and 13 d of the bottom plate 13 in a state where the turning motor 31 is attached to the bottom plate 13.

  FIG. 8 is a perspective view showing the peripheral portion of the spline shaft attached to the holder bracket 20 in the rotational force transmission mechanism in more detail together with the holder bracket 20, and FIG. 9 is a sectional view thereof. As shown in these drawings, the rotational force transmission mechanism has a cylindrical spline shaft 34 constituting a ball spline and an outer cylinder 35 thereof. A bearing 36 is attached to the upper portion of the spline shaft 34, and the bearing 36 is inserted and held in the through hole of the holder bracket 20. A ball spline gear 37 and a ball spline outer cylinder 35 are provided at the center of the spline shaft 34. The ball spline gear 37 has a cylindrical portion 37a in the upper portion and a cylindrical portion 37b having a small outer diameter which is coaxial with the lower portion, and a gear portion 37c is provided on the outer periphery of the upper cylindrical portion 37a. The outer cylinder 35 of the ball spline is fixed in the upper cylindrical portion 37a of the ball spline gear 37 by screws from the side. The gear portion 37 c of the ball spline gear 37 is engaged with the gear 33. Also, bearings 38 and 39 are inserted into the through holes 13e of the bottom plate 13 and are held by the stepped portions 13g. These bearings 38 and 39 are bearings that allow the ball spline gear 37 to rotate by holding the outer periphery of the lower cylindrical portion 37b of the ball spline gear. Further, a ball bearing 40 and a clutch plate 41 are attached to the lower end of the spline shaft 34. The spline shaft 34 moves up and down together with the slider 18 and the holder bracket 20 with the rotation of the servo motor 14, and rotates with the rotation of the turning motor 31.

  10A is a front view showing the clutch plate 41, FIG. 10B is a bottom view, and FIG. 10C is a perspective view. As shown in these drawings, the clutch plate 41 is a disk-shaped member and is attached to the lower end of the spline shaft 34. A pair of projecting portions 41a and 41b are formed on the lower surface of the clutch plate 41 at positions symmetrical to 180 degrees, and the central portion is cut out in a circular shape. Here, the width of this protrusion is T1. In addition, threaded grooves are formed on both sides of the disc portion from both sides.

  Next, the holder joint 50 press-fitted into the metal collar 23 of the holder flange 21 will be described. The left side of FIG. 11 is a side view of the holder joint 50, and the right side is a cross-sectional view. The holder joint 50 has a cylindrical king pin 51 in the center. The king pin 51 rotates with the rotation of the spline shaft 34, and the cylindrical portion thereof has first and second bearings 52, 53 for holding the king pin 51 rotatably at the upper part and the central part. Is provided via a cylindrical spacer 54. Also, a king pin presser 55 and a bearing cover 56 are provided below the king pin 51. A scribing wheel 58 is rotatably held by a pin 57 below the king pin 51. Further, a connecting boss 59 is fixed to the upper portion of the king pin 51 by screwing.

  12A is a plan view of the connecting boss 59, FIG. 12B is a sectional view, FIG. 12C is a side view, and FIG. 12D is a perspective view. As shown in these drawings, the connecting boss 59 is a cylindrical member, and notches 59a and 59b are provided on the upper side wall at positions 180.degree. Symmetrical. The notches 59a and 59b are notched so as to expand upward at an angle α (for example, 15 °), and the left and right protrusions 41a and 41b of the clutch plate 41 are engaged with the notches. It becomes. Here, the width T2 of the notch is slightly larger than the width T1 of the protruding portion of the clutch plate 41 described above, and play is provided when the rotational force is transmitted.

  Next, the bottom cover 60 attached below the holder joint 50 will be described. 13A is a plan view showing the bottom cover 60, FIG. 13B is a sectional view, FIG. 13C is a side view, and FIG. 13D is a perspective view. As shown in these drawings, the bottom cover is configured such that a cylindrical portion 60b is integrally formed on a lower surface of a rectangular parallelepiped housing portion 60a. As shown in FIGS. 13B and 13D, a through hole 60c having a large diameter is formed on the right side portion, and a rubber lid 61 is attached to the side wall of the housing portion 60a. A through hole 60d is formed coaxially with the through hole 60c on the left side wall of the housing 60a. Furthermore, a wide shallow notch 60e including the through hole 60d is provided to the lower end of the left side wall. A thread groove 60f is formed in the notch 60e below the through hole 60d. An L-shaped blank plate 62 is attached to the notch 60e via a knurled screw 63. The blank plate 62 has a long hole 62a on the lower side. By loosening the knurled screw 63, the blank plate 62 is moved up and down along the notch 60e within the range of the long hole 62a, or fixed by tightening. The hole 60d can be opened or closed.

  Next, the reset bar 70 used as a setting jig for setting the reference angle in the present embodiment will be described. FIG. 14A is a partially cutaway sectional view showing the reset bar 70, FIG. 14B is a front view, and FIG. 14C is a perspective view. As shown in these drawings, the reset bar 70 is a thin cylindrical member, and includes a handle portion 70a and a cylindrical portion 70b. The handle portion 70a has a structure in which both sides of a cylinder are cut out. A cutout groove 70c having a U-shaped cross section is formed on the upper surface of the cylindrical portion 70b in parallel with the central axis of the reset bar 70. Further, the tip portion of the lower surface of the cylindrical portion 70b has a notch 70d that is notched in a circular arc shape up to a certain range.

  Here, in the present embodiment, the gear 33, the ball spline gear 37, the spline shaft 34, the clutch plate 41, and the connecting boss 59 transmit the rotational force of the turning motor 31 to the king pin 51 of the holder joint 50 with play. A transmission mechanism is configured.

  Next, the setting of the reference angle performed before starting the operation of this embodiment will be described with reference to FIG. First, the turning motor 31 is rotated so that the pair of protrusions 41 a and 41 b of the clutch plate 41 are aligned in a direction perpendicular to the surface of the base plate 11. Next, the knurled screw 63 is loosened and the blank plate 62 is slid downward to open the through hole 60d. Also, the lid 61 sealing the through hole 60c of the bottom cover 60 is removed, and the reset bar 70 is inserted from this opening. At this time, the circular notch 70d at the tip of the reset bar 70 is inserted downward into the through holes 21f and 21g of the holder flange 21 and the through hole 60d of the bottom cover 60 with the notch groove 70c facing upward. In this way, the protrusions 41a and 41b of the clutch plate 41 are fitted into the notch groove 70c, and the reset bar 70 can be inserted horizontally. When the reset bar 70 reaches the base plate 11, the arc-shaped notch 70d fits into the pin 11a attached to the lower center of the base plate 11, so that the reset bar 70 can be accurately held horizontally. In this state, the current angle indicated by the value of the encoder 32 connected to the turning motor 31 is set as the reference angle.

  After setting the reference angle in this way, the reset bar 70 is removed, the blank plate 62 is slid upward, the through hole 60d is closed, and the blank plate 62 is fixed with the knurled screw 63. Further, the through hole 60 c is closed by the lid 61. Next, the holder joint 50 is inserted from below the holder flange 21 and press-fitted into the metal collar 23. As a result, the clutch plate 41 and the connecting boss 59 can be connected. If it carries out like this, after that, the rotation motor 31 is rotated on the basis of the reference angle, and the angle of the scribing wheel can be accurately controlled by detecting the angle of the encoder 32.

  Next, the operation of the present embodiment will be described. The ball screw 17 is rotated by driving a servo motor 14 attached to the upper surface of the top plate 12. Thereby, the slider 18 can move up and down between the highest position and the lowest position of the linear way 19 shown in FIG. As the slider 18 moves up and down, the holder bracket 20, the holder flange 21, and the spline shaft 34 connected to the slider 18 also move up and down at the same time. Thus, even when the distance between the slider 18 and the holder flange 21 is large, they can be connected and moved up and down.

  Next, the operation when forming a curved scribe line will be described. By driving the turning motor 31 held on the top of the bottom plate 13, the gear 33 connected to the turning motor 31 rotates. As a result, the spline shaft 34 also rotates through the ball spline gear 37 meshed with the gear 33, and the clutch plate 41 fixed to the lower end rotates. Along with this, the king pin 51 rotates through the connecting boss 59 fixed to the upper portion of the king pin 51, and the angle of the scribing wheel 58 held below the king pin 51 can be changed. Accordingly, as shown in FIG. 1, the scribe line can be easily formed into a curve.

  In this embodiment, the pin 11a is provided on the base plate 11 as positioning means. Instead, a recess is provided in the base plate 11 so that the tip of the reset bar 70 can be inserted only at a predetermined angle. Also good.

  In the present invention, the scribe line can be easily bent by changing the traveling direction of the scribing wheel by a motor, and can be suitably used for scribing a bonded substrate.

DESCRIPTION OF SYMBOLS 10 Scribe head 11 Base plate 12 Top plate 13 Bottom plate 14 Servo motor 15 Encoder 16 Coupling 17 Ball screw 18 Slider 19 Linear way 20 Holder bracket 21 Holder flange 23 Metal collar 31 Turning motor 32 Encoder 33 Gear 34 Spline shaft 35 Outer cylinder 37 Ball spline gear 38, 39 Bearing 41 Clutch plate 50 Holder joint 51 King pin 58 Scribing wheel 59 Connecting boss 60 Bottom cover 61 Lid 62 Blank plate 63 Knurled screw 70 Reset bar

Claims (4)

A base plate;
A swivel motor with an encoder connected thereto;
A rotational force transmission mechanism for transmitting the rotational force of the turning motor;
A holder joint having a king pin attached to a lower end, and having a king pin that rotates along its axis by the rotational force transmitted by the rotational force transmission mechanism;
A holder flange for holding the holder joint,
The rotational force transmission mechanism is
A shaft that is rotationally driven by the turning motor;
A pair of protrusions in a straight line, a clutch plate attached to the shaft and rotating together with the shaft, and transmitting the rotational force to the kingpin;
The base plate is a positioning means for positioning the tip of the reset bar when a reset bar having a groove along the axis and a notch at the tip is inserted so that the groove fits into the protruding portion of the clutch plate. Have
The holder flange is a scribe head having a through hole at a position of a side wall corresponding to a pair of projecting portions of the clutch plate.   The scribe head according to claim 1, further comprising a bottom cover that covers the holder flange, and a through hole provided at a position corresponding to a protruding portion of the clutch plate of the bottom cover.   The scribe head according to claim 2, wherein an openable / closable plate is provided in the through hole of the bottom cover. The scribe head according to claim 1, wherein
Insert a reset bar having a groove along the axis so as to fit into the protrusion of the clutch plate,
Hold the tip of the reset bar in contact with the positioning means of the base plate,
A scribing head reference angle setting method for setting a value of the encoder indicating a current angle of the swing motor as a reference angle.

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