WO2016170898A1

WO2016170898A1 - Plate glass processing device

Info

Publication number: WO2016170898A1
Application number: PCT/JP2016/059191
Authority: WO
Inventors: 真澄伊吹; 耕二市川; 安宏澤村; 賢二三品
Original assignee: 日本電気硝子株式会社
Priority date: 2015-04-22
Filing date: 2016-03-23
Publication date: 2016-10-27
Also published as: CN107107294B; KR20170141186A; TWI687281B; KR102421573B1; JP2016203307A; JP6504352B2; CN107107294A; TW201641212A

Abstract

This plate glass processing device (1) is provided with: a synchronous motor (2) that drives and rotates a processing tool (B); an arm member (3) that supports the processing tool (B) so as to be rotatable; a support shaft member (4) that supports the arm member (3) so as to be rotatable; and a pressing force generation part (5) that applies force couple to the arm member (3) to generate a pressing force acting from the processing tool (B) on an end face of a plate glass (A).

Description

Sheet glass processing equipment

The present invention relates to a sheet glass processing apparatus for processing an end face of a sheet glass with a processing tool.

In recent years, in order to meet demands for improving the production efficiency and increasing the size of liquid crystal displays and the like, the size of the plate glass used for this tends to increase. If the size of the plate glass is increased, the number of glass substrates that can be taken from a single plate glass increases, so that it is possible to efficiently manufacture a glass substrate corresponding to a large liquid crystal display.

If there is a scratch on the edge of the plate glass, cracks or the like are generated from the scratch. Therefore, the edge of the plate glass is chamfered to prevent this. Further, in order to increase the processing quantity per hour and lower the manufacturing cost, increasing the conveyance speed (processing speed) of the plate glass is being studied.

If the end surface of the chamfered plate glass is observed with a microscope, the undulation due to fine irregularities can be confirmed on the end surface of the plate glass. Such a plate glass may cause chipping or cracks due to the undulations in the subsequent process (assembly process), and must be polished so that the end surface of the plate glass is uniform. However, in order to perform polishing so that the end surface of the plate glass is uniform, the polishing allowance of the plate glass must be set larger, so that the polishing time becomes longer and the conveyance speed (processing speed) of the plate glass can be further increased. Have difficulty.

As described above, there is a limit to increasing the conveyance speed (processing speed) of the plate glass, and forcibly increasing the speed is caused by, for example, undulations caused by microscopic unevenness existing on the end surface of the plate glass. The processing tool is repelled by the generated impact force (impact force acting on the processing tool from the end face of the plate glass), the processing tool is separated from the end face of the plate glass (hereinafter, this phenomenon is called “bound”), and is not polished on the end face of the plate glass. The part remains.

As a technique for preventing the bouncing of the processing tool as described above and processing the end face of the plate glass at high speed, Patent Document 1 discloses a rotatable arm member that supports the processing tool, and the plate glass from the processing tool via the arm member. There is disclosed a sheet glass processing apparatus including a pressing force generating element that generates a pressing force that acts on the end surface of the sheet glass, and a buffer element that buffers an impact force that acts on the processing tool from the end surface of the sheet glass. This plate glass processing apparatus can absorb the impact force acting on the processing tool from the end surface of the plate glass by the buffer element, thereby preventing the processing tool from bouncing and polishing the end surface while conveying the plate glass at a high speed. it can.

International Publication WO2013 / 187400

By the way, the plate glass processing apparatus described above processes (polishs) the end surface of the plate glass while rotating the processing tool by a motor. In order to realize the optimum processing for the end face of the plate glass, it is necessary to select a motor suitable for the processing tool. In view of this, the present inventor has made a detailed study on the motor conditions that enable favorable processing on the end face of the plate glass. As a result, it has been found that the following phenomenon occurs when a specific motor is used, particularly at the start of machining. Details will be described below.

FIG. 8 shows the behavior of the processing tool at the start of processing. As shown in FIG. 8, the plate glass A to be processed is conveyed along the feed direction C. Further, the plate glass A has an end surface in the entire range from an end portion (hereinafter referred to as “starting end portion”) A1 at which processing is started to an end portion (hereinafter referred to as “terminal end portion”) A2 at which processing is completed. It is processed by B. In this case, after the processing tool B contacted the start end part A1 of the plate glass A, it bounced without maintaining the state of contact with the end face of the plate glass A, and a phenomenon that this bounce was repeated was observed. For this reason, it turned out that in the end surface of the plate glass A, a part by the side of the start end part A1 is not processed.

The present inventor was able to identify the cause as a result of observing the bouncing of the processing tool B in detail at the start of the processing. That is, the present inventor has been able to specify that this bounce occurs when a servo motor is employed as the motor for driving the processing tool B. Hereinafter, the reason why this bounce occurs will be described.

Servo motor adopts speed feedback control (closed loop control). Specifically, the servo motor includes a detection device (encoder) capable of detecting the rotation speed and a comparison device that compares the rotation speed value detected by the detection device with a target value. The output torque of the servo motor is controlled by the comparison by the comparison device so that the rotation speed can maintain the target value.

At the start of processing, the processing tool B is brought into contact with the starting end A1 of the plate glass A to reduce its rotational speed. The servo motor abruptly increases its output torque in order to compensate for this decrease in rotational speed. Due to the increase in the output torque, the force applied by the processing tool B to the end surface of the plate glass A increases in a short time, and the reaction force from the plate glass A increases accordingly. Then, a moment around the rotation axis is generated in the arm member that supports the processing tool B, and the processing tool B is separated from the end surface of the plate glass A by the action.

Thereafter, the processing tool B comes into contact with the end surface of the plate glass A by the pressing force generated by the pressing force generating element. When the rotation speed of the processing tool B decreases again due to this contact, the servo motor increases the output torque again, and thus the above bounce is repeated. As described above, a plurality of bounces occurred at the start of processing, and as a result, portions that were not processed remained in a plurality of locations on the end surface in the vicinity of the starting end portion A1 of the plate glass A.

The bouncing of the processing tool B at the start of processing as described above is forcibly generated by torque fluctuations caused by the servo motor. Therefore, this bounce is much larger than the conventional bounce that occurs due to undulations caused by minute irregularities on the end face of the plate glass A. For this reason, in the buffer element in the conventional plate glass processing apparatus, the bouncing of the processing tool B generated at the start of processing cannot be prevented, and another means has to be taken.

This invention is made | formed in view of said situation, and makes it a subject to prevent the bouncing of the processing tool at the time of a process start, when processing the end surface of a plate glass.

The present invention is to solve the above-described problems, and is a plate glass processing apparatus that processes an end surface of a plate glass with a processing tool, and a synchronous motor that rotationally drives the processing tool, and the processing tool can be rotated. An arm member to be supported, a support shaft member that rotatably supports the arm member, and a couple force applied to the arm member to generate a pressing force that acts on the end surface of the plate glass from the processing tool. A pressure generating unit.

According to this structure, while supporting an arm member rotatably by a support shaft member, by making the pressing force by a pressing force generation part act on a processing tool via this arm member, a processing tool makes the end surface of a plate glass. It can always be processed at a constant pressure. In the present invention, a synchronous motor is employed as a motor for rotationally driving the processing tool. By using an open loop control type synchronous motor, the processing tool can be rotationally driven without using a servo motor. Therefore, the bouncing of the processing tool at the start of processing can be prevented by preventing fluctuation (increase) in the torque of the motor at the start of processing.

The plate glass processing apparatus further includes a position control unit that controls a position of the processing tool with respect to the end surface of the plate glass, and the position control unit is configured so that the processing tool comes into contact with a starting end portion of the plate glass and The stroke of the processing tool may be limited to a predetermined value so that the processing tool does not leave the end surface of the plate glass until the predetermined distance on the end surface moves relatively.

Thus, by restricting the stroke of the processing tool at the start of processing by the position control unit, it is possible to reliably prevent the processing tool from coming off the end surface of the plate glass after contacting the start end.

In this case, the stroke of the processing tool is preferably limited to 0.03 mm or more and 0.05 mm or less. The predetermined distance by which the processing tool moves relative to the plate glass is preferably 5 mm or more and 40 mm or less. Moreover, it is desirable that the processing allowance while the processing tool moves relative to the plate glass relative to the predetermined distance is 0.03 mm or more and 0.05 mm or less.

According to the present invention, when processing the end face of the plate glass, it is possible to prevent the processing tool from bouncing at the start of processing.

FIG. 1 is a schematic top view showing an embodiment of a sheet glass processing apparatus according to the present invention. FIG. 2 is a side view of the position control unit taken along line II-II in FIG. FIG. 3 is a diagram illustrating the position of the cam follower with respect to the rotational phase of the cam member. FIG. 4a shows a state in which the cam member is rotated to the first rotation phase. FIG. 4b shows the cam member rotated to the second rotational phase. FIG. 4c shows the cam member rotated to the third rotational phase. FIG. 4d shows a state where the cam member is rotated to the fourth rotational phase. FIG. 5a shows the processing tool in the standby position. FIG. 5b shows the processing tool in the first polishing position. FIG. 5c shows the processing tool in the second polishing position. FIG. 5d shows the processing tool in the retracted position. FIG. 6 is a schematic top view showing the behavior of the processing tool at the first polishing position. FIG. 7 is a schematic top view showing a state where the end face of the plate glass is inclined with respect to the feeding direction and the end face is polished by the processing tool. FIG. 8 is a schematic top view showing the behavior at the start of machining of the machining tool rotated by the servo motor.

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. 1 to 7 show an embodiment of a sheet glass processing apparatus according to the present invention.

The plate glass A to be processed by the plate glass processing apparatus 1 has a rectangular plate shape. The plate thickness of the plate glass A is, for example, 0.05 mm to 10 mm. However, the present invention is not limited to this. The present invention can also be applied to processing of a glass sheet A having a shape other than a rectangle (for example, a polygon), and processing of a glass sheet A having a thickness other than 0.05 mm to 10 mm.

The end surface of the plate glass A is processed by the processing tool B. The end face processing of the plate glass A by the processing tool B may be a polishing process for making the unevenness of the end face after the chamfering process uniform. Further, the end surface processing of the plate glass A may be a chamfering processing (grinding process) of the end surface of the plate glass A.

The plate glass A moves relative to the processing tool B. For example, the processing is performed in a state where the processing tool B is fixed to the plate glass A moving along the plate glass feeding direction C. Moreover, it can process with respect to the fixed plate glass A, the processing tool B moving along the feed direction C. FIG. The processing tool B is a grindstone that is rotationally driven, for example, and polishes the end surface of the plate glass A while the grindstone rotates.

The smaller the diameter of the grindstone, the smaller the contact area between the plate glass A and the grindstone. Therefore, the grinding resistance received by the grindstone from the plate glass A becomes smaller, and the grindstone easily follows the end surface of the plate glass A. The polishing resistance can be reduced by reducing the contact area with the grindstone. In the present embodiment, for the processing tool B, for example, a grindstone having a diameter of 150 mm may be used.

As shown in FIG. 1, a plate glass processing apparatus 1 includes a synchronous motor 2 that rotationally drives a processing tool B, an arm member 3 that rotatably supports the processing tool B, and a support shaft member 4 that supports the arm member 3. A pressing force generator 5 that generates a pressing force acting on the end surface of the glass sheet A from the processing tool B, a buffer unit 6 that absorbs an impact applied to the processing tool B, and a position for controlling the position of the processing tool B. The control part 7 is mainly provided.

The synchronous motor 2 rotates in synchronization with the rotational speed difference between the rotating magnetic field generated by the alternating current and the magnetic field generated by the armature current. The synchronous motor 2 rotationally drives the processing tool B by open loop control without using closed loop control (feedback control). The synchronous motor 2 is supported at the tip of the arm member 3. The drive shaft of the synchronous motor 2 is connected to the processing tool B.

The arm member 3 is rotatably supported by the support shaft member 4. The arm member 3 includes a first arm portion 3a and a second arm portion 3b connected to the first arm portion 3a. The first arm portion 3 a supports the synchronous motor 2 at one end thereof, and supports the processing tool B via the synchronous motor 2. The other end of the first arm portion 3a is connected to the second arm portion 3b. The depression angle θ (see FIG. 1) formed by the feeding direction C of the glass sheet A and the first arm portion 3a of the arm member 3 is preferably 25 ° to 35 °. One end portion of the second arm portion 3 b is connected (fixed) to the other end portion of the first arm portion 3 a via the support shaft member 4. The position control unit 7 is connected to the second arm unit 3b.

As the arm member 3 rotates, the processing tool B moves in the direction of pressing against the end surface of the plate glass A (K1 direction shown in FIG. 1: the pressing direction) or escapes from the end surface of the plate glass A (see FIG. 1 in the K2 direction: the escape direction).

The support shaft member 4 connects the other end of the first arm portion 3a and one end of the second arm portion 3b. Thereby, the 1st arm part 3a and the 2nd arm part 3b are connected with a fixed depression angle. The support shaft member 4 is configured to rotate following the rotation of the arm member 3 when the arm member 3 is rotated by the pressing force of the pressing force generator 5 and the control of the position controller 7.

The pressing force generator 5 generates a pressing force that acts on the end surface of the plate glass A from the processing tool B by applying a couple to the first arm 3 a of the arm member 3. For example, the pressing force generator 5 can be a low sliding resistance air cylinder. In the present embodiment, a diaphragm cylinder can be used as a low sliding resistance air cylinder in consideration of high response due to low slidability and long life due to pistonless.

In addition, the plate glass processing apparatus 1 is further provided with a glass state measuring unit (not shown). The glass state measuring unit measures the glass state of the plate glass A flowing into the plate glass processing apparatus 1. For example, the glass state measuring unit can detect the state of the plate glass A by bringing a roller into contact with the end surface of the plate glass A flowing into the plate glass processing apparatus 1. The pressing force generator 5 generates a pressing force on the processing tool B according to the state of the plate glass A measured by the glass state measuring unit.

The buffer section 6 buffers the impact force acting on the processing tool B from the end surface of the plate glass A. The impact force acting on the processing tool B from the end surface of the plate glass A is generated due to, for example, undulation caused by microscopic unevenness existing on the end surface of the plate glass A.

The buffer unit 6 functions as a damper element and can be, for example, a dashpot. In the present embodiment, the buffer unit 6 is a non-sealed water dashpot, and can utilize the resistance when water passes through the gap between the piston and the tube as a buffer function. For example, when the buffer unit 6 includes a check valve, the buffer unit 6 acts on the end surface of the plate glass A from the first tool that acts on the processing tool B from the end surface of the plate glass A. Of the second force, only the first force is buffered (here, the first force acts in the direction of arrow E and the second force acts in the direction of arrow F).

The buffer unit 6 may include a link mechanism (not shown) that transmits the force acting on the arm member 3 to the dashpot. As the link mechanism, for example, a Scott Russell link mechanism is employed. When the buffer unit 6 includes the Scott Russell link mechanism, the movement along the horizontal direction by the arm member 3 can be converted into the vertical movement by the piston along the vertical direction. As a result, a vertical water dashpot can be used as the buffer section 6.

The position control unit 7 controls the position of the arm member 3 so that the processing tool B sequentially moves to the standby position, the first polishing position, the second polishing position, and the retracted position. Here, the standby position refers to a position where the processing tool B waits for contact with the end surface of the plate glass A. The first polishing position refers to the time from when the processing tool B comes into contact with the starting end A1 of the plate glass A when processing is started until the predetermined distance on the end surface of the plate glass A is relatively moved. The position of the processing tool B where polishing is continued. The second polishing position refers to the position of the processing tool B where the processing tool B continuously polishes to the end portion A2 of the glass sheet A after the predetermined distance is moved at the first polishing position. Further, the retracted position refers to a position where the processing tool B is retracted in the escape direction from the standby position.

As shown in FIG. 2, the position control unit 7 includes a cam member 8 (cylindrical pinching cam) and a cam follower 9 (arm control member) in order to control the position of the processing tool B as described above.

The cam member 8 is rotationally driven by a cam member rotation motor 10. In the present embodiment, the cam member rotation motor 10 is a servo motor, for example. The cam member 8 is rotationally driven by a cam member rotation motor 10 at a designated speed (designated phase). The servo motor can be equipped with a speed reducer.

The cam follower 9 includes a first cam follower 9a and a second cam follower 9b that are spaced apart at a constant interval. The

cam followers

9 a and 9 b are connected to the second arm portion 3 b of the arm member 3. Thereby, each

cam follower

9a, 9b is comprised so that interlocking with the arm member 3 is possible. Each

cam follower

9a, 9b is displaced along the rotation axis direction (arrow J1 direction or arrow J2 direction) of the cam member 8 following the rotating cam member 8. When the arm member 3 (second arm portion 3b) rotates in conjunction with the

cam followers

9a and 9b displaced in the arrow J1 direction, the processing tool B moves in the pressing direction (arrow K1 direction). On the other hand, when the arm member 3 rotates in conjunction with the

cam followers

9a and 9b displaced in the arrow J2 direction, the processing tool B moves in the escape direction (arrow K2 direction).

The cam member 8 is a cylindrical end face cam, and has a first cam surface 8a and a second cam surface 8b opposed to the first cam surface 8a. The first cam surface 8 a is a surface on one side of the cam member 8 in the rotation axis direction. The first cam surface 8a can contact the first cam follower 9a while the cam member 8 rotates. The second cam surface 8b is the other side surface of the cam member 8 in the rotation axis direction. The second cam surface 8b can contact the second cam follower 9b while the cam member 8 rotates.

In conjunction with the rotation of the cam member 8, the contact position and contact state between the first cam surface 8a and the first cam follower 9a and the contact position and contact state between the second cam surface 8b and the second cam follower 9b change. As a result, the processing tool B sequentially moves to the standby position, the first polishing position, the second polishing position, and the retracted position. Specifically, the cam member 8 is driven by the cam member rotation motor 10 to generate a first rotation phase (0 °), a second rotation phase (45 °), a third rotation phase (120 °), and a first rotation phase. Rotate sequentially to 4 rotation phases (240 °).

When the cam member 8 rotates to the first rotation phase, the processing tool B moves to the standby position. Further, when the cam member 8 rotates to the second rotation phase, the processing tool B moves to the first polishing position. Further, when the cam member 8 rotates to the third rotation phase, the processing tool B moves to the second polishing position. Then, when the cam member 8 rotates to the fourth rotation phase, the processing tool B moves to the retracted position.

Referring to FIGS. 3, 4a and 5a, the relationship between the first rotation phase and the standby position and the operation thereof will be described below.

As shown in FIGS. 3 and 4a, in the first rotational phase (0 °), the width of the portion of the cam member 8 interposed between the first cam follower 9a and the second cam follower 9b is the first cam follower 9a. And the distance between the second cam follower 9b. For this reason, the first cam follower 9a contacts the first cam surface 8a, and the second cam follower 9b contacts the second cam surface 8b, whereby the first cam follower 9a and the second cam follower 9b are in the direction of arrow J1 (processing tool B). Is displaced in the direction in which the

cam followers

9a, 9b are displaced so as to move in the pressing direction) or in the direction of the arrow J2 (the direction in which the

cam followers

9a, 9b are displaced so as to move the processing tool B in the escape direction), The arm member 3 is locked so that it cannot rotate. For this reason, in the first rotation phase, the processing tool B is disposed at a predetermined position (the standby position in the present embodiment) and does not move. As shown in FIG. 5a, at the standby position, the depression angle ω constituted by the feed direction C and the longitudinal direction of the first arm portion 3a of the arm member 3 is, for example, 30 °.

Referring to FIGS. 3, 4b, 5b and 6, the relationship between the second rotational phase and the first polishing position and the operation thereof will be described below.

The arm member 3 is unlocked at the first polishing position, and the arm member 3 is arm free (unlocked). In the arm free state, the pressing force generator 5 applies a couple to the arm member 3 to generate a pressing force on the processing tool B.

As shown in FIGS. 3 and 4b, at the second rotational phase (45 °) corresponding to the first polishing position, the portion of the cam member 8 interposed between the first cam follower 9a and the second cam follower 9b. The width (hereinafter sometimes referred to as “cam width at the second rotational phase”) is smaller than the distance between the first cam follower 9a and the second cam follower 9b. Therefore, the first cam follower 9a and the second cam follower 9b are within a certain distance (the distance obtained by subtracting the cam width at the second rotational phase from the interval between the

cam followers

9a and 9b), and in the direction of the arrow J1 or the arrow J2 The arm member 3 is free to rotate.

The stroke of the arm member 3 is limited when the first cam follower 9a contacts the first cam surface 8a or the second cam follower 9b contacts the second cam surface 8b. Specifically, due to the displacement of the

cam followers

9a and 9b in the direction of arrow J1, the processing tool B moves in the pressing direction from the standby position. The position at which the processing tool B has moved to the maximum in the pressing direction (the position of the solid line in FIG. 5b), that is, the state where the first cam follower 9a is in contact with the first cam surface 8a (the solid line in the second rotational phase of FIG. 3). In the state indicated by), the depression angle formed by the feed direction C and the longitudinal direction of the first arm portion 3a of the arm member 3 is ω + α1. Further, due to the displacement of the

cam followers

9a and 9b in the direction of the arrow J2, the processing tool B moves in the escape direction from the standby position. The position at which the processing tool B has moved to the maximum in the escape direction (the position indicated by the two-dot chain line in FIG. 5b), that is, the state where the second cam follower 9b is in contact with the second cam surface 8b (the second rotational phase in FIG. 3). In a state indicated by a two-dot chain line in FIG. 2), the depression angle formed by the feed direction C and the longitudinal direction of the first arm portion 3a of the arm member 3 is ω-α1. This α1 is, for example, less than 1 °. Α1 can be adjusted by changing the distance obtained by subtracting the cam width in the second rotational phase from the interval between the

cam followers

9a and 9b.

Thus, the stroke of the arm member 3 is limited by the above α1. Correspondingly, the movable distance (hereinafter referred to as “stroke”) S of the processing tool B is also limited (see FIG. 6). The limit of the stroke S of the processing tool B is that the processing tool B comes into contact with the starting end A1 of the plate glass A, and the processing tool B has a predetermined distance (hereinafter referred to as “initial polishing distance”) L along the end surface of the plate glass A. Until the relative movement (see FIG. 6). Specifically, the stroke S of the processing tool B at the first polishing position can be limited to 0.03 mm or more and 0.05 mm or less. Further, the initial polishing distance L in the processing tool B can be set to 5 mm or more and 40 mm or less. In this first polishing position, the machining allowance D (see FIG. 6) of the processing tool B can be 0.03 mm or more and 0.05 mm or less.

The relationship between the third rotational phase and the second polishing position and the operation thereof will be described below with reference to FIGS.

As shown in FIGS. 3 and 4c, in the third rotational phase (120 °), the width of the portion of the cam member 8 interposed between the first cam follower 9a and the second cam follower 9b (hereinafter referred to as “third”). The cam width in the rotational phase ”may be smaller than the distance between the first cam follower 9a and the second cam follower 9b. However, the cam width in the third rotational phase is set smaller than the cam width in the second rotational phase. The first cam follower 9a and the second cam follower 9b are displaced in the direction of the arrow J1 or the arrow J2 within a certain distance (the distance obtained by subtracting the cam width in the third rotational phase from the interval between the

cam followers

9a and 9b). It is free and the arm member 3 is in a rotatable free state.

The stroke of the arm member 3 is limited when the first cam follower 9a contacts the first cam surface 8a or the second cam follower 9b contacts the second cam surface 8b. Specifically, as shown in FIG. 5c, in the third rotational phase, the processing tool B moves in the pressing direction from the standby position due to the displacement of the

cam followers

9a and 9b in the direction of the arrow J1. The position at which the processing tool B has moved to the maximum in the pressing direction (the position indicated by the solid line in FIG. 5c), that is, the state where the first cam follower 9a is in contact with the first cam surface 8a (the solid line in the third rotation phase in FIG. 3). In the state indicated by), the depression angle formed by the feeding direction C and the longitudinal direction of the first arm portion 3a of the arm member 3 is ω + α2. Further, due to the displacement of each

cam follower

9a, 9b in the direction of arrow J2, the processing tool B moves in the escape direction from the standby position. The position at which the processing tool B has moved to the maximum in the escape direction (the position of the two-dot chain line in FIG. 5c), that is, the state where the second cam follower 9b is in contact with the second cam surface 8b (in the third rotational phase of FIG. In a state indicated by a two-dot chain line), the depression angle formed by the feeding direction C and the longitudinal direction of the first arm portion 3a of the arm member 3 is ω−α2. α2 is larger than α1 (α2> α1), for example, 1 °. Α2 can be adjusted by changing the distance obtained by subtracting the cam width in the third rotational phase from the interval between the

cam followers

9a and 9b.

Thus, the stroke of the arm member 3 is limited by the above α2. Accordingly, the stroke of the processing tool B is also limited. The restriction of the stroke of the processing tool B is continuously executed until the processing tool B reaches the terminal end A2 of the plate glass A after changing to the third rotational phase. Specifically, the stroke of the processing tool B at the second polishing position is limited to 3 mm or less. Note that at the second polishing position, the processing allowance (polishing allowance) of the processing tool B is set to 0.03 mm or more and 0.05 mm or less similarly to the case of the first polishing position.

Referring to FIG. 1, FIG. 3, FIG. 4d, FIG. 5d, and FIG. 7, the relationship between the fourth rotational phase and the retracted position and the operation thereof will be described below.

The plate glass processing apparatus 1 normally causes the processing tool B to polish the end surface in a posture in which the end surface of the plate glass A is parallel to the feed direction C, as shown in FIG. However, polishing with the processing tool B may be performed in a posture in which the end surface of the plate glass A is inclined with respect to the feeding direction C.

This state is shown in FIG. As shown in FIG. 7, the terminal end portion A2 of the end surface of the plate glass A deviates from the track R at the time of parallel conveyance to the side closer to the processing tool B. When polishing the end surface of the sheet glass A in such a posture, when the processing tool B is returned from the polishing end position (solid line position) to the standby position (two-dot chain line position), the processing tool B removes the end surface of the sheet glass A. By scratching, the end face or the processing tool B may be damaged. For this reason, when polishing is completed, it is necessary to temporarily retract the processing tool B in the escape direction with respect to the end surface of the plate glass A and then return to the standby position. For this reason, the processing tool B can move to the retracted position.

As shown in FIGS. 3 and 4d, in the fourth rotational phase (240 °), the width of the portion of the cam member 8 interposed between the first cam follower 9a and the second cam follower 9b is the first cam follower 9a. And the distance between the second cam follower 9b. The first cam follower 9a contacts the first cam surface 8a, and the second cam follower 9b contacts the second cam surface 8b, whereby the first cam follower 9a and the second cam follower 9b are displaced in the directions of arrows J1 and J2. Is restricted, and the arm member 3 enters a locked state in which it cannot rotate.

Further, as shown in FIG. 3, the first cam surface 8a (or the first cam surface 8a in the fourth rotational phase) with respect to the position of the first cam surface 8a (or the second cam surface 8b) in the first rotational phase. The position of the two cam surfaces 8b) is offset by a predetermined distance in the direction of the arrow J2. Therefore, following the cam member 8 rotated to the fourth rotation phase, the first cam follower 9a and the second cam follower 9b are displaced in the direction of the arrow J2, and the processing tool B is moved in the escape direction from the standby position. Let As shown in FIG. 5d, at the retracted position where the processing tool B has moved in the escape direction, the included angle formed by the feed direction C and the longitudinal direction of the first arm portion 3a of the arm member 3 is ω-β.

In this embodiment, β is the same angle as α2. That is, the position (ω−α2) at which the processing tool B has moved to the maximum in the escape direction at the second polishing position and the retracted position (ω−β) of the processing tool B are the same position. Β is an offset of the first cam surface 8a (or second cam surface 8b) in the fourth rotational phase with respect to the position of the first cam surface 8a (or second cam surface 8b) in the first rotational phase. It can be adjusted by changing the distance.

Hereinafter, a plate glass manufacturing method executed by the plate glass processing apparatus 1 having the above configuration will be described.

This plate glass manufacturing method includes a step of controlling the processing tool B to sequentially move to the standby position, the first polishing position, the second polishing position, and the retracted position. First, the plate glass processing apparatus 1 moves the processing tool B to the standby position. Specifically, the cam member 8 is rotated to the first rotation phase by driving the cam member rotation motor 10. In conjunction with the cam member 8 rotated to the first rotation phase, the processing tool B moves to the standby position. In the standby position, the arm member 3 is in a locked state, and the processing tool B does not move freely.

When the plate glass A conveyed along the feeding direction C approaches the processing tool B, the plate glass processing apparatus 1 moves the processing tool B to the first polishing position. The plate glass processing apparatus 1 rotates the cam member rotation motor 10 in accordance with the timing at which the processing tool B comes into contact with the starting end A1 of the plate glass A. As the cam member rotation motor 10 is driven, the cam member 8 rotates to the second rotation phase. Immediately before the processing tool B moves in conjunction with the cam member 8 rotated to the second rotational phase and comes into contact with the glass sheet A, the processing tool B is disposed at the first polishing position. By moving to a 1st grinding | polishing position, the processing tool B will be in the state which can contact the starting end part A1 of the plate glass A. FIG. Furthermore, the plate glass processing apparatus 1 drives the synchronous motor 2 to rotate the processing tool B.

FIG. 6 shows the behavior of the processing tool B in the first polishing position. The processing tool B arranged at the first polishing position comes into contact with the starting end A1 of the plate glass A conveyed along the feeding direction C. The processing tool B tends to leave the starting end A1 by this contact. At this time, the second cam follower 9 b connected to the second arm portion 3 b of the arm member 3 contacts the second cam surface 8 b of the cam member 8. Accordingly, the movement of the second arm portion 3b in the escape direction is restricted, and the processing tool B is also regulated so as not to be separated from the end surface of the plate glass A according to this. Thereby, the processing tool B can maintain the contact with respect to the end surface of the plate glass A, and can further continue processing the end surface with a processing allowance D (polishing allowance).

The pressing force generator 5 generates a pressing force immediately before the processing tool B comes into contact with the starting end A1 of the plate glass A, and thereafter continues to apply the pressing force until the processing tool B reaches the terminal end A2. .

When the polishing at the first polishing position is completed (the processing tool B moves the initial polishing distance L), the plate glass processing apparatus 1 changes the processing tool B to the second polishing position. Specifically, the plate glass processing apparatus 1 rotates the cam member rotation motor 10 while maintaining the contact of the processing tool B with the plate glass A. As the cam member rotation motor 10 is driven, the cam member 8 rotates to the third rotation phase. The processing tool B moves to the second polishing position in conjunction with the cam member 8 rotated to the third rotational phase. At the second polishing position, the processing tool B continues to polish while being in contact with the end face of the plate glass A.

During this polishing, when an impact force acts on the processing tool B from the end surface of the plate glass A due to undulations due to fine irregularities present on the end surface of the plate glass A, the pressing force generator 5 is moved from the processing tool B to the plate glass A. While generating a pressing force that acts on the end face of the shock absorber 6, the shock absorber 6 buffers this impact force.

Finally, when the processing tool B arrives at the terminal end A2 of the plate glass A, the plate glass processing apparatus 1 moves the processing tool B to the retracted position, and finishes the polishing. Specifically, when the processing tool B arrives at the terminal end portion A2 of the plate glass A, the cam member 8 is rotated to the fourth rotation phase by driving of the cam member rotation motor 10. In conjunction with the cam member 8 rotated to the fourth rotational phase, the processing tool B moves to the retreat position in the escape direction. In the retracted position, the arm member 3 is in a locked state, and the processing tool B does not move freely.

As described above, polishing of one sheet glass A is performed, but the sheet glass processing apparatus 1 can polish a plurality of sheet glasses A conveyed at a predetermined interval by repeating the above steps. it can.

According to the plate glass processing apparatus 1 according to the present embodiment described above, an open-loop control type synchronous motor 2 is employed as a motor for driving the processing tool B, and the processing tool B is rotationally driven by the control, thereby processing the processing tool B. The bouncing of the processing tool B at the start can be prevented. That is, since the synchronous motor 2 is not a feedback control type like the servo motor, even if the processing tool B comes into contact with the starting end A1 of the plate glass A, the output torque is rapidly increased like the servo motor. Control is not performed. Thereby, when the processing tool B is driven by the servo motor, it is possible to prevent the bouncing of the processing tool B that has occurred at the start of processing.

In addition, the stroke S of the processing tool B is limited by the position control unit 7 so as not to leave the end surface of the glass sheet A while polishing at an initial polishing distance L (a distance of 5 mm to 40 mm from the start end A1). (0.03 mm to 0.05 mm). Thereby, the plate glass processing apparatus 1 can prevent more effectively the bouncing of the processing tool B at the time of a process start.

In addition, this invention is not limited to the structure of the said embodiment, It is not limited to the above-mentioned effect. The present invention can be variously modified without departing from the gist of the present invention.

In the above embodiment, the first rotation phase is 0 °, the second rotation phase is 45 °, the third rotation phase is 120 °, and the fourth rotation phase is 240 °. However, the present invention is not limited to this. The first rotation phase to the fourth rotation phase can be appropriately set according to the demand for controlling the operation of the processing tool B.

In the above embodiment, α2 is 1 °, but it may be other than 1 °. Moreover, although α1 was less than 1 °, it may be 1 ° or more as long as it is smaller than α2. Β is the same angle as α2, but β may be an angle different from α2.

In the above embodiment, a grindstone is exemplified as the processing tool B, and the processing tool B performs polishing on the end surface of the plate glass A, but the present invention is not limited to this. As long as the end surface of the plate glass A can be processed, a processing tool B other than a grindstone can be applied.

DESCRIPTION OF SYMBOLS 1 Sheet glass processing apparatus 2 Synchronous motor 3 Arm member 4 Support shaft member 5 Pressing force generation part 7 Position control part A Sheet glass B Processing tool

Claims

A plate glass processing apparatus for processing an end face of a plate glass with a processing tool,
A synchronous motor for rotationally driving the processing tool;
An arm member that rotatably supports the processing tool;
A support shaft member that rotatably supports the arm member;
A sheet glass processing apparatus comprising: a pressing force generation unit that generates a pressing force that acts on an end surface of the sheet glass from the processing tool by applying a couple to the arm member.
A position control unit for controlling the position of the processing tool with respect to the end surface of the plate glass; and the position control unit is configured to set a predetermined distance on the end surface of the plate glass when the processing tool comes into contact with the start end portion of the plate glass. The plate glass processing apparatus according to claim 1, wherein a stroke of the processing tool is limited to a predetermined value so that the processing tool is not separated from an end surface of the plate glass until it relatively moves.
The plate glass processing apparatus according to claim 2, wherein a stroke of the processing tool is limited to 0.03 mm or more and 0.05 mm or less.
The plate glass processing apparatus according to claim 2 or 3, wherein the predetermined distance that the processing tool moves relative to the plate glass is 5 mm or more and 40 mm or less. *
5. The plate glass processing according to claim 2, wherein a machining allowance while the processing tool moves relative to the plate glass relative to the predetermined distance is 0.03 mm or more and 0.05 mm or less. apparatus.