JP2012061623A - Scribe head - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten a distance enabling a scribe line to be scribed in a desired direction when the scribe line is bent.SOLUTION: Rotary force of a turning motor 31 is transmitted to a kingpin 51 through a gear 33 and a spline shaft 34. Thereby, the rotary force is applied to a holder joint 50 to which a scribing wheel is mounted and the holder joint 50 is rotated. As a result, the scribe line is formed while freely changing the running direction of the scribing wheel to shorten the distance enabling the scribe line to be scribed in a desired direction.

Description

  The present invention relates to a scribing head used in a scribing apparatus, and more particularly to a scribing head capable of rotating the direction of a holder joint suitable for scribing a bonded substrate.

  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, the direction of the cutting edge is changed by the caster effect by changing the moving direction of the scribe head, and the scribe line is meandered.

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 an object of the present invention is to shorten a useless scribe distance by rotating a holder joint to which a cutting edge is attached by a motor.

  In order to solve this problem, the scribe head of the present invention includes a holder joint that holds a scribing wheel, a turning motor, and a rotational force transmission mechanism that transmits the rotational force of the turning motor to the holder joint. The holder joint includes a king pin that has a scribing wheel attached to a lower end thereof and that rotates around its axis by the rotational force transmitted by the rotational force transmission mechanism.

  Here, the rotational force transmission mechanism includes a first gear fixed to the output shaft of the swing motor, a second gear meshing with the first gear, a shaft rotating with the rotation of the second gear, A clutch plate that is attached to the shaft and rotates together with the shaft, and a connecting boss that is fixed to an upper portion of the king pin, rotates following the rotation of the clutch plate, and transmits the rotation of the clutch plate to the king pin with play. You may make it have.

  Here, the king pin may be rotatably held along its axis by a pair of bearings.

  According to the present invention having such characteristics, the direction of the cutting edge can be actively changed when scribing using the scribing head. 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 and a sectional view of the spline shaft according to the present embodiment. FIG. 9 is a view showing a clutch plate according to the present embodiment. FIG. 10 is a side view and a cross-sectional view of the holder joint according to the present embodiment. FIG. 11 is a plan view, a cross-sectional view, a side view, and a perspective view showing the connecting boss according to the present embodiment. FIG. 12 is a sectional view showing a state in which the holder joint is lowered in the scribe head according to 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 surface of the slider 18, and a holder flange 21 is attached to the lower end of the holder bracket 20.

  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, on the lower surface of the slider 18, through holes 18b for rotatably holding a spline shaft, which will be described later, and screw grooves 18c and 18d for connecting the holder bracket 20, screw grooves 18f for screwing the shaft holder of the spline shaft. , 18 g, etc. are formed.

  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 and a central longitudinal sectional view in FIG. 7B, and has a flange 21a formed on the upper surface, and the lower end of the holder bracket 20 described above. It is fixed with screws. A metal collar 23 is attached to the cylindrical portion below the holder flange 21. A holder joint 50 described later is press-fitted into the internal space of the metal collar 23.

  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 encoder 32 for detecting the rotation angle is provided on the upper part of the turning motor 31. A first gear 33 is fixed to the output shaft of the swing 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.

  8A and 8B are a perspective view and a cross-sectional view showing in more detail the periphery of the spline shaft in the rotational force transmission mechanism. As shown in these drawings, the rotational force transmission mechanism has a spline shaft 34 constituting a ball spline and its outer cylinder 35. The spline shaft 34 is a cylindrical member. A spline shaft holder 36 is fixed to the top of the spline shaft 34, and a ball spline gear 37 is provided at the center. The upper end of the spline shaft 34 is inserted into the through hole 18 b on the lower surface of the slider 18, and the spline shaft holder 36 is screwed to the screw grooves 18 f and 18 g on the lower surface of the slider 18. A ball spline outer cylinder 35 is 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 inner diameter which is coaxial with the lower portion, and a gear portion 37c serving as a second gear is provided on the outer periphery of the upper cylindrical portion 37a. The outer cylinder 35 of the ball spline is fixed to 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 as the motor 14 rotates, and rotates as the turning motor 31 rotates.

  9A is a front view showing the clutch plate 41, FIG. 9B is a bottom view, and FIG. 9C 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 41 a and 41 b are formed on the lower surface of the clutch plate 41 at positions 180 degrees symmetrical. Here, the width of this protrusion is T1.

  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. 10 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.

  11A is a plan view of the connecting boss 59, FIG. 11B is a sectional view, FIG. 11C is a side view, and FIG. 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.

  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 transmitted to the king pin 51 of the holder joint 50 with play. The mechanism is configured.

  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 of the linear way 19 shown in FIG. 3 and the lowest position 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. According to the present invention, a curved scribe line can be easily formed by changing the angle of the scribing wheel by the motor instead of the caster effect accompanying the superficial operation.

  In this embodiment, as described above, the clutch plate 41 is provided with a pair of protrusions so as to transmit the rotational force to the connecting boss 59 via play. Here, when the table or scribe head is moved in a desired XY direction, the direction of the scribe line and the glass substrate are slightly different depending on the inclination when the glass substrate is placed on the table. If the traveling directions of the two do not match completely, the surface at the time of cutting will not be flat. However, in this embodiment, the king pin is rotatably held by a pair of bearings, and further there is play between the clutch plate and the connecting boss. The scribe direction can be changed to a desired scribe direction and the scribing wheel direction and the traveling direction of the glass substrate can be made to coincide with each other, so that the cut surface can be kept flat. .

  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

Claims (3)

A holder joint that holds the scribing wheel;
A swing motor;
A rotational force transmission mechanism that transmits the rotational force of the swing motor to the holder joint,
The holder joint is
A scribing head comprising a king pin having a scribe wheel attached to a lower end thereof and rotating around its axis by a rotational force transmitted by the rotational force transmission mechanism. The rotational force transmission mechanism is
A first gear fixed to the output shaft of the swing motor;
A second gear meshing with the first gear;
A shaft that rotates as the second gear rotates;
A clutch plate attached to the shaft and rotating together with the shaft;
The scribe head according to claim 1, further comprising: a connecting boss that is fixed to an upper portion of the king pin, rotates following the rotation of the clutch plate, and transmits the rotation of the clutch plate to the king pin with play.   The scribe head according to claim 1 or 2, wherein the king pin is rotatably held along a shaft thereof by a pair of bearings.

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