CN107107294B

CN107107294B - Plate glass processing device

Info

Publication number: CN107107294B
Application number: CN201680005489.9A
Authority: CN
Inventors: 伊吹真澄; 市川耕二; 泽村安宏; 三品贤二
Original assignee: Nippon Electric Glass Co Ltd
Current assignee: Nippon Electric Glass Co Ltd
Priority date: 2015-04-22
Filing date: 2016-03-23
Publication date: 2020-01-03
Anticipated expiration: 2036-03-23
Also published as: WO2016170898A1; KR102421573B1; TWI687281B; TW201641212A; KR20170141186A; JP2016203307A; CN107107294A; JP6504352B2

Abstract

The invention provides a plate glass processing device. A plate glass processing device (1) is provided with: a synchronous motor (2) that rotationally drives a machining tool (B); an arm member (3) that rotatably supports a machining tool (B); a support shaft member (4) that rotatably supports the arm member (3); and a pressing force generation unit (5) that generates a pressing force acting on the end surface of the plate glass (A) from the processing tool (B) by applying a couple to the arm member (3).

Description

Plate glass processing device

Technical Field

The present invention relates to a plate glass processing apparatus for processing an end surface of a plate glass by using a processing tool.

Background

In recent years, in order to meet the demand for an increase in production efficiency and an increase in size of a liquid crystal display or the like, the size of plate glass used therefor tends to increase. When the size of the plate glass is increased, the number of glass substrates obtained from one plate glass is increased, and therefore, a glass substrate corresponding to a large-sized liquid crystal display can be efficiently manufactured.

If the end portion of the plate glass has a flaw, a crack or the like occurs from the flaw, and therefore, the end portion of the plate glass is chamfered to prevent the flaw. In addition, in order to increase the number of processes per unit time and reduce the manufacturing cost, a study has been made on increasing the conveying speed (processing speed) of the sheet glass.

When the end surface of the chamfered plate glass is observed with a microscope, undulation due to minute unevenness can be confirmed on the end surface of the plate glass. Such a plate glass may be broken or cracked due to the undulation in a subsequent step (assembly step), and it is necessary to perform polishing so that the end surface of the plate glass becomes uniform. However, since the polishing margin of the plate glass has to be set large in order to polish the end face of the plate glass uniformly, the polishing time becomes long, and it is difficult to further increase the conveying speed (processing speed) of the plate glass.

When the conveying speed (machining speed) of the sheet glass is set to a high speed limit and the speed is increased by force, for example, the machining tool is sprung up by an impact force (impact force acting on the machining tool from the end face of the sheet glass) generated due to undulation caused by microscopic unevenness present on the end face of the sheet glass, and the machining tool is separated from the end face of the sheet glass (this phenomenon is hereinafter referred to as "bounce"), and an unground portion remains on the end face of the sheet glass.

As a technique for processing an end face of a sheet glass at a high speed while preventing the jump-up of the processing tool as described above, patent document 1 discloses a sheet glass processing apparatus including: a rotatable arm member supporting the processing tool; a pressing force generating element for generating a pressing force acting from the processing tool to the end surface of the plate glass via the arm member; and a buffer element for buffering the impact force applied to the processing tool from the end face of the plate glass. The plate glass processing device can prevent the jump of the processing tool by using the buffer element to buffer the impact force acting on the processing tool from the end surface of the plate glass, and can carry out the grinding of the end surface of the plate glass while carrying the plate glass at high speed.

Prior art documents

Patent document

Patent document 1: international publication No. WO2013/187400

Problems to be solved by the invention

However, the above-described plate glass processing apparatus rotates the processing tool by the motor and processes (grinds) the end surface of the plate glass. In order to achieve optimum machining of the end face of the sheet glass, it is necessary to select a motor suitable for the machining tool. In view of this, the present inventors have made detailed studies on the conditions of a motor capable of favorably processing the end face of a plate glass. As a result, it was found that the following phenomenon occurs particularly at the start of machining when a specific motor is used. The details thereof are explained below.

Fig. 8 shows the operation of the machining tool at the start of machining. As shown in fig. 8, a sheet glass a to be processed is conveyed in a conveying direction C. The sheet glass a is processed by the processing tool B over its entire range from an end a1 at which processing starts (hereinafter referred to as a "starting end") to an end a2 at which processing ends (hereinafter referred to as a "terminal end"). In this case, the following phenomenon is found: after the machining tool B has contacted the leading end portion a1 of the sheet glass a, the machining tool B cannot jump up while maintaining contact with the end face of the sheet glass a, and the jump up is repeated. Therefore, it was determined that a part of the end face of the plate glass a on the side of the starting end portion a1 was not processed.

The present inventors have observed the jump-up of the machining tool B at the start of the machining in detail, and as a result, have identified the cause thereof. That is, the present inventors have been able to determine that the jump-up occurs when a servomotor is used as a motor for driving the machining tool B. The reason why the jump occurs will be described below.

The servo motor employs speed feedback control (closed loop control). Specifically, the servo motor includes a detection device (encoder) capable of detecting the rotation speed thereof, and a comparison device for comparing the rotation speed value detected by the detection device with a target value. The servo motor controls its output torque by comparison based on the comparison means so that its rotational speed can maintain a target value.

When the machining is started, the machining tool B abuts on the starting end portion a1 of the sheet glass a, and the rotational speed thereof is reduced. The output torque of the servomotor is abruptly increased to compensate for the decrease in the rotational speed. The increase in the output torque increases the force applied by the working tool B to the end surface of the plate glass a in a short time, and accordingly, the reaction force from the plate glass a also increases. Then, a moment about the rotation axis is generated in the arm member supporting the processing tool B, and the processing tool B is separated from the end surface of the plate glass a by the action thereof.

Then, the machining tool B is brought into contact with the end face of the plate glass a by a pressing force based on the pressing force generating element. When the rotational speed of the machining tool B is reduced again by this contact, the servomotor increases the output torque again, and the jump-up described above is repeated. As a result of the multiple times of jumping at the start of processing, unprocessed portions remain at multiple positions on the end face in the vicinity of the starting end portion a1 of the plate glass a.

The above-described jumping of the machining tool B at the start of machining is forcibly generated by the fluctuation of the torque of the servomotor. Therefore, the jump is extremely large as compared with the conventional jump caused by the undulation due to the minute unevenness on the end surface of the plate glass a. Therefore, in the conventional sheet glass processing apparatus, the buffer element cannot prevent the machining tool B from jumping up at the start of machining, and another mechanism is required.

Disclosure of Invention

The present invention has been made in view of the above circumstances, and an object thereof is to prevent a machining tool from jumping up when machining is started when machining an end face of a plate glass.

Means for solving the problems

The present invention is made to solve the above-described problems, and provides a plate glass processing apparatus for processing an end surface of a plate glass by a processing tool, including: a synchronous motor that drives the machining tool to rotate; an arm member that rotatably supports the processing tool; a support shaft member that rotatably supports the arm member; and a pressing force generating unit that generates a pressing force acting from the processing tool on the end surface of the plate glass by applying a couple to the arm member.

According to the above configuration, the arm member is rotatably supported by the support shaft member, and the pressing force by the pressing force generating portion is applied to the processing tool via the arm member, whereby the processing tool can process the end surface of the plate glass at a constant pressure at all times. In the present invention, a synchronous motor is used as a motor for driving the machining tool to rotate. By using the open-loop control type synchronous motor, the machining tool can be driven to rotate without using a servo motor. Therefore, by preventing the torque of the motor from varying (increasing) at the start of machining, the machining tool can be prevented from jumping up at the start of machining.

The plate glass processing apparatus may further include a position control unit that controls a position of the processing tool with respect to the end surface of the plate glass, wherein the position control unit limits a stroke of the processing tool to a predetermined value so that the processing tool does not separate from the end surface of the plate glass during a period from when the processing tool comes into contact with the start end portion of the plate glass to when the processing tool relatively moves by a predetermined distance on the end surface of the plate glass.

In this way, by limiting 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 into contact with the start end portion and then separating from the end surface of the plate glass.

In this case, it is desirable to limit the stroke of the machining tool to 0.03mm to 0.05 mm. Further, it is desirable that the predetermined distance by which the processing tool moves relative to the plate glass is 5mm to 40 mm. Further, it is desirable that the machining allowance during the relative movement of the machining tool with respect to the plate glass by the predetermined distance is 0.03mm to 0.05 mm.

Effects of the invention

According to the present invention, when the end face of the plate glass is processed, the processing tool can be prevented from jumping up at the start of processing.

Drawings

Fig. 1 is a schematic plan 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 section as viewed from the line II-II in fig. 1.

Fig. 3 is a diagram showing the position of the rotational phase of the cam follower with respect to the cam member.

Fig. 4a shows a state in which the cam member is rotated to the first rotational phase.

Fig. 4b shows a state in which the cam member is rotated to the second rotational phase.

Fig. 4c shows a state in which the cam member is rotated to the third rotational phase.

Fig. 4d shows a state in which the cam member is rotated to the fourth rotational phase.

Fig. 5a shows the working tool in a standby position.

Fig. 5b shows the working tool in a first grinding position.

Fig. 5c shows the working tool in a second grinding position.

Fig. 5d shows the machining tool in the retracted position.

Fig. 6 is a schematic plan view showing the behavior of the processing tool at the first polishing position.

Fig. 7 is a schematic plan view showing how the end face of the plate glass is polished by a processing tool in a posture inclined with respect to the conveyance direction.

Fig. 8 is a schematic plan view showing a behavior of a machining tool rotationally driven by a servomotor at the start of machining.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. Fig. 1 to 7 show an embodiment of a plate 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, 0.05mm to 10 mm. However, the present invention is not limited thereto. The present invention is also applicable to the processing of plate glass a having a shape other than a rectangular shape (for example, a polygonal shape), and the processing of plate glass a having a plate thickness other than 0.05mm to 10 mm.

The end face of the plate glass a is processed by a processing tool B. The end face processing of the plate glass a by the processing tool B may be a grinding treatment for making the unevenness of the chamfered end face uniform. The end face processing of the plate glass a may be chamfering (grinding) of the end face of the plate glass a.

The plate glass a is relatively moved with respect to the processing tool B. For example, the glass sheet a moving in the glass sheet conveying direction C is processed with the processing tool B fixed. Further, the processing tool B may be moved in the conveyance direction C with respect to the fixed plate glass a to perform the processing. The machining tool B is, for example, a grinding wheel that is rotationally driven, and grinds the end surface of the plate glass a while rotating the grinding wheel.

Since the contact area between the plate glass a and the grindstone becomes smaller as the diameter of the grindstone is smaller, the grinding resistance received by the grindstone from the plate glass a becomes smaller, and the grindstone easily follows the end face of the plate glass a. The grinding resistance can be reduced by reducing the contact area with the grinding wheel. In the present embodiment, a grinding wheel having a diameter of 150mm, for example, can be used as the machining tool B.

As shown in fig. 1, a glass sheet processing apparatus 1 mainly includes a synchronous motor 2 that rotationally drives a processing tool B, an arm member 3 that rotatably supports the processing tool B, a support shaft member 4 that supports the arm member 3, a pressing force generating portion 5 that generates a pressing force acting from the processing tool B on an end surface of a glass sheet a, a buffer portion 6 that absorbs an impact applied to the processing tool B, and a position control portion 7 that controls a position of the processing tool B.

The synchronous motor 2 rotates in synchronization with a rotation speed difference between a rotating magnetic field generated by an alternating current and a magnetic field generated by an armature current. The synchronous motor 2 rotationally drives the machining tool B by open-loop control, instead of closed-loop control (feedback control). The synchronous motor 2 is supported by the tip end portion of the arm member 3. The drive shaft of the synchronous motor 2 is coupled to the machining 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 3 a. The first arm portion 3a supports the synchronous motor 2 at one end portion thereof, and supports the machining tool B via the synchronous motor 2. The other end of the first arm portion 3a is connected to the second arm portion 3 b. The angle θ (see fig. 1) formed by the conveyance direction C of the sheet glass a and the first arm portion 3a of the arm member 3 is preferably 25 ° to 35 °. One end of the second arm portion 3b is connected (fixed) to the other end of the first arm portion 3a via the support shaft member 4. A position control unit 7 is connected to the second arm portion 3 b.

By the rotation of the arm member 3, the processing tool B is moved in a direction of pressing against the end surface of the sheet glass a (K1 direction: pressing direction shown in fig. 1) or in a direction of separating from the end surface of the sheet glass a (K2 direction: separating direction shown in fig. 1).

The support shaft member 4 connects the other end of the first arm portion 3a and the one end of the second arm portion 3 b. The first arm portion 3a and the second arm portion 3b are thereby connected with a certain angle. The support shaft member 4 is configured to rotate following the rotation when the arm member 3 is rotated by the pressing force generated by the pressing force generating unit 5 and the control by the position control unit 7.

The pressing force generating unit 5 generates a pressing force acting from the processing tool B to the end surface of the plate glass a by applying a couple to the first arm portion 3a of the arm member 3. For example, the pressing force generating portion 5 may be a low sliding resistance cylinder. In the present embodiment, a diaphragm cylinder can be used as the low sliding resistance cylinder in consideration of high response due to low sliding property, long life due to no piston, and the like.

The plate glass processing apparatus 1 further includes a glass state measuring unit (not shown). The glass state measuring unit measures the glass state of the sheet glass a flowing into the sheet 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 generating unit 5 generates a pressing force against the processing tool B based on the state of the plate glass a measured by the glass state measuring unit.

The buffer portion 6 buffers an impact force acting from the end surface of the plate glass a against the processing tool B. The impact force acting from the end face of the plate glass a against the processing tool B is generated, for example, by undulation due to microscopic unevenness existing on the end face of the plate glass a.

The buffer portion 6 functions as a damping element, and may be a shock absorber (dash pot), for example. In the present embodiment, the damper portion 6 is an open-type water damper, and can use resistance when water passes through a gap between the piston and the pipe as a damper function. For example, by providing the buffer portion 6 with a check valve, the buffer portion 6 buffers only a first force of a first force acting from the end surface of the plate glass a to the processing tool B and a second force acting from the end surface of the processing tool B to the plate glass a (here, the first force acts in the direction of the arrow E, and the second force acts in the direction of the arrow F).

The buffer portion 6 may include a link mechanism (not shown) that transmits the force acting on the arm member 3 to the damper. As the link mechanism, for example, a schlegumatin link mechanism is used. When the shock absorbing portion 6 includes the smighrelin link mechanism, the movement in the horizontal direction by the arm member 3 can be converted into the vertical movement in the vertical direction by the piston. As a result, the vertical water damper can be used as the buffer portion 6.

The position control unit 7 controls the position of the arm member 3 so that the processing tool B moves to the standby position, the first polishing position, the second polishing position, and then to the retracted position in this order. Here, the standby position is a position at which the processing tool B waits to come into contact with the end surface of the plate glass a. The first polishing position is a position of the processing tool B at which polishing is continued until the processing tool B is moved relative to the end surface of the sheet glass a by a predetermined distance after coming into contact with the starting end portion a1 of the sheet glass a at the start of processing. The second polishing position is a position of the processing tool B in which the polishing is continued until the terminal end portion a2 of the sheet glass a after the processing tool B has moved the predetermined distance described above at the first polishing position. The retracted position is a position at which the machining tool B is retracted in a direction away from the standby position.

As shown in fig. 2, the position control unit 7 includes a cam member 8 (cylinder sandwiching cam) and a cam follower 9 (arm control member) for controlling the position of the processing tool B as described above.

The cam member 8 is rotationally driven by a cam member rotating motor 10. In the present embodiment, the cam member rotating motor 10 is, for example, a servo motor. The cam member 8 is rotationally driven at a prescribed speed to a prescribed phase (angle) by a cam member rotating motor 10. Furthermore, the servomotor may be provided with a reduction gear.

The cam follower 9 includes a first cam follower 9a and a second cam follower 9b separated at a certain interval. The

cam followers

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

cam followers

9a and 9b are configured to be interlocked with the arm member 3. The

cam followers

9a and 9b are driven by the rotating cam member 8 and displace in the rotational axial direction (the direction of arrow J1 or the direction of arrow J2) of the cam member 8. When the arm member 3 (second arm portion 3B) is rotated in conjunction with the cam followers 9a, 9B displaced in the arrow J1 direction, the working tool B is moved in the pressure contact direction (arrow K1 direction). On the other hand, when the arm member 3 is rotated in conjunction with the cam followers 9a, 9B displaced in the arrow J2 direction, the processing tool B moves in the separating 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 8 a. The first cam surface 8a is a surface on one side in the rotational axial direction of the cam member 8. The first cam surface 8a can be in contact with the first cam follower 9a during rotation of the cam member 8. The second cam surface 8b is the other surface of the cam member 8 in the rotational axial direction. The second cam surface 8b can contact the second cam follower 9b during rotation of the cam member 8.

In conjunction with the rotation of the cam member 8, the contact position and the contact state between the first cam surface 8a and the first cam follower 9a, and the contact position and the contact state between the second cam surface 8b and the second cam follower 9b change. Thereby, the machining tool B is sequentially moved to the standby position, the first polishing position, the second polishing position, and the retracted position. Specifically, the cam member 8 is sequentially rotated toward the first rotational phase (0 °), the second rotational phase (45 °), the third rotational phase (120 °), and the fourth rotational phase (240 °) by the driving of the cam member rotating motor 10.

By rotating the cam member 8 to the first rotation phase, the machining tool B moves to the standby position. Further, by rotating the cam member 8 to the second rotational phase, the machining tool B is moved to the first polishing position. Further, by rotating the cam member 8 to the third rotational phase, the machining tool B is moved to the second polishing position. Then, by rotating the cam member 8 to the fourth rotation phase, the machining tool B is moved to the retracted position.

The relationship between the first rotational phase and the standby position and the operation thereof will be described below with reference to fig. 3, 4a, and 5 a.

As shown in fig. 3 and 4a, in the first rotational phase (0 °), the width of a portion of the cam member 8 sandwiched between the first cam follower 9a and the second cam follower 9b is equal to the interval between the first cam follower 9a and the second cam follower 9 b. Therefore, the first cam follower 9a is brought into contact with the first cam surface 8a, and the second cam follower 9B is brought into contact with the second cam surface 8B, whereby the displacement of the first cam follower 9a and the second cam follower 9B in the direction of arrow J1 (the direction in which the cam followers 9a and 9B are displaced so as to move the working tool B in the pressure contact direction) or the direction of arrow J2 (the direction in which the cam followers 9a and 9B are displaced so as to move the working tool B in the separating direction) is restricted, and the arm member 3 is brought into a locked state in which it cannot rotate. Therefore, in the first rotational phase, the machining tool B is not moved but is disposed at a predetermined position (in the present embodiment, the standby position). As shown in fig. 5a, at the standby position, an angle ω formed by the conveying direction C and the longitudinal direction of the first arm portion 3a of the arm member 3 is, for example, 30 °.

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

In the first polishing position, the arm member 3 is unlocked, and the arm member 3 becomes free (unlocked). In the arm-free state, the pressing force generating unit 5 generates a pressing force against the processing tool B by applying a couple to the arm member 3.

As shown in fig. 3 and 4b, in the second rotational phase (45 °) corresponding to the first polishing position, the width of a portion of the cam member 8 sandwiched between the first cam follower 9a and the second cam follower 9b (hereinafter, sometimes referred to as "cam width in the second rotational phase") is smaller than the interval between the first cam follower 9a and the second cam follower 9 b. Therefore, the first cam follower 9a and the second cam follower 9b are freely displaced in the direction of arrow J1 or the direction of arrow J2 within a certain distance (distance obtained by subtracting the cam width in the second rotational phase from the distance between the

cam followers

9a and 9 b), and the arm member 3 is brought into a rotatable free state.

The stroke of the arm member 3 is limited by bringing the first cam follower 9a into contact with the first cam surface 8a or the second cam follower 9b into contact with the second cam surface 8 b. Specifically, the displacement of the cam followers 9a and 9B in the direction of arrow J1 causes the working tool B to move in the pressure contact direction from the standby position. In a position where the working tool B moves to the maximum in the pressure contact direction (position of the solid line in fig. 5B), that is, in a state where the first cam follower 9a is in contact with the first cam surface 8a (state indicated by the solid line in the second rotational phase in fig. 3), an angle formed by the conveyance direction C and the longitudinal direction of the first arm portion 3a of the arm member 3 is ω + α 1. Further, the machining tool B is moved in the separating direction from the standby position by the displacement of the cam followers 9a and 9B in the direction of the arrow J2. An angle formed by the conveying direction C and the longitudinal direction of the first arm portion 3a of the arm member 3 is ω - α 1 at a position where the processing tool B moves maximally in the separating direction (a position indicated by a two-dot chain line in fig. 5B), that is, in a state where the second cam follower 9B is in contact with the second cam surface 8B (a state indicated by a two-dot chain line in the second rotational phase of fig. 3). α 1 is, for example, 1 ° or less. Note that α 1 can be adjusted by changing the distance obtained by subtracting the cam width in the second rotational phase from the distance between the

cam followers

9a and 9 b.

Thus, the stroke of the arm member 3 is limited by α 1 described above. Accordingly, the movable distance (hereinafter referred to as "stroke") S of the working tool B is also limited (see fig. 6). The stroke S of the processing tool B is continuously limited until the processing tool B comes into contact with the leading end portion a1 of the sheet glass a and moves the processing tool B a predetermined distance (hereinafter referred to as "initial polishing distance") L along the end surface of the sheet glass a (see fig. 6). Specifically, the stroke S of the machining tool B at the first polishing position can be limited to 0.03mm to 0.05 mm. The initial polishing distance L in the processing tool B can be set to 5mm to 40 mm. In the first polishing position, the machining allowance D (see fig. 6) of the machining tool B may be set to 0.03mm to 0.05 mm.

The relationship between the third rotational phase and the second polishing position and the operation thereof will be described below with reference to fig. 3, 4c, and 5 c.

As shown in fig. 3 and 4c, in the third rotational phase (120 °), the width of a portion of the cam member 8 sandwiched between the first cam follower 9a and the second cam follower 9b (hereinafter, sometimes referred to as "cam width in the third rotational phase") is smaller than the interval between the first cam follower 9a and the second cam follower 9 b. Wherein 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 freely displaced in the direction of arrow J1 or the direction of arrow J2 within a certain distance (distance obtained by subtracting the cam width at the third rotational phase from the distance between the

cam followers

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

The stroke of the arm member 3 is limited by bringing the first cam follower 9a into contact with the first cam surface 8a or the second cam follower 9b into contact with the second cam surface 8 b. Specifically, as shown in fig. 5c, in the third rotational phase, the working tool B is moved in the pressure contact direction from the standby position by the displacement of the cam followers 9a and 9B in the direction of the arrow J1. In a position where the working tool B is moved to the maximum in the pressure contact direction (position of the solid line in fig. 5C), that is, in a state where the first cam follower 9a is not in contact with the first cam surface 8a (state indicated by the solid line in the third rotational phase of fig. 3), an angle formed by the conveying direction C and the longitudinal direction of the first arm portion 3a of the arm member 3 is ω + α 2. Further, the machining tool B is moved in the direction of the away from the standby position by the displacement of the cam followers 9a and 9B in the direction of the arrow J2. In a position where the processing tool B is moved maximally in the separating direction (a position of a two-dot chain line in fig. 5C), that is, in a state where the second cam follower 9B is in contact with the second cam surface 8B (a state indicated by a two-dot chain line in the third rotational phase in fig. 3), an angle formed by the conveying direction C and the longitudinal direction of the first arm portion 3a of the arm member 3 is ω - α 2.α 2 is larger than α 1(α 2 > α 1) described above, and is, for example, 1 °. Note that α 2 can be adjusted by changing the distance obtained by subtracting the cam width in the third rotational phase from the distance between the

cam followers

9a and 9 b.

Thus, the stroke of the arm member 3 is limited by α 2 described above. Accordingly, the stroke of the working tool B is also limited. The restriction of the stroke of the machining tool B is continuously performed until the machining tool B reaches the terminal end a2 of the glass sheet a after the change to the third rotational phase. Specifically, the stroke of the working tool B in the second polishing position is limited to 3mm or less. In the second polishing position, the machining allowance (polishing allowance) of the machining tool B is set to 0.03mm to 0.05mm, as in the case of the first polishing position.

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

In general, as shown in fig. 1, the plate glass processing apparatus 1 polishes the end surface of the plate glass a with the processing tool B in a posture in which the end surface is parallel to the conveyance direction C. However, the polishing by the processing tool B may be performed in a posture in which the end face of the plate glass a is inclined with respect to the conveyance direction C.

This state is shown in fig. 7. As shown in fig. 7, the end portion a2 of the end face of the sheet glass a is separated from the rail R during parallel conveyance to the side closer to the processing tool B. When the end face of the plate glass a is polished in such a posture, if the machining tool B returns from the polishing end position (the position of the solid line) to the standby position (the position of the two-dot chain line), the machining tool B scratches the end face of the plate glass a, and may damage the end face or the machining tool B. Therefore, when the polishing is completed, the processing tool B needs to be temporarily retracted in the separating direction with respect to the end surface of the plate glass a and then returned to the standby position. The machining tool B moves to the retracted position for the reason described above.

As shown in fig. 3 and 4d, in the fourth rotational phase (240 °), the width of a portion of the cam member 8 sandwiched between the first cam follower 9a and the second cam follower 9b is equal to the interval between the first cam follower 9a and the second cam follower 9 b. By bringing the first cam follower 9a into contact with the first cam surface 8a and the second cam follower 9b into contact with the second cam surface 8b, displacements in the directions of arrows J1 and J2 of the first cam follower 9a and the second cam follower 9b are restricted, and the arm member 3 is brought into a locked state in which it cannot rotate.

As shown in fig. 3, the position of the first cam surface 8a (or the second cam surface 8b) in the fourth rotational phase is offset by a predetermined distance in the direction of arrow J2 with respect to the position of the first cam surface 8a (or the second cam surface 8b) in the first rotational phase. Therefore, the first cam follower 9a and the second cam follower 9B are displaced in the direction of arrow J2 in response to the cam member 8 rotating to the fourth rotational phase, and the processing tool B is moved in the direction away from the standby position. As shown in fig. 5d, at the retreat position after the movement of the processing tool B in the separating direction, the angle formed by the conveying direction C and the longitudinal direction of the first arm portion 3a of the arm member 3 is ω - β.

In the present embodiment, β is the same angle as α 2. That is, at the second polishing position, the position (ω - α 2) at which the machining tool B moves maximally in the separating direction is the same position as the retracted position (ω - β) of the machining tool B. Note that β can be adjusted by changing the offset distance of the first cam surface 8a (or the second cam surface 8b) 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.

A method for manufacturing a sheet glass by the sheet glass processing apparatus 1 having the above-described configuration will be described below.

The sheet glass manufacturing method includes a step of controlling the processing tool B to move to a standby position, a first polishing position, a second polishing position, and a retracted position in order. 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 the driving of the cam member rotating motor 10. The machining tool B moves to the standby position in conjunction with the cam member 8 rotated to the first rotational phase. In the standby position, the arm member 3 is in a locked state, and the working tool B cannot move freely.

When the sheet glass a conveyed in the conveying direction C approaches the processing tool B, the sheet glass processing apparatus 1 moves the processing tool B to the first polishing position. The glass sheet processing apparatus 1 rotates the cam member rotating motor 10 in accordance with the timing at which the processing tool B contacts the leading end portion a1 of the glass sheet a. The cam member 8 is rotated to the second rotation phase by the driving of the cam member rotating motor 10. The working tool B is moved in conjunction with the cam member 8 rotated to the second rotational phase, and is disposed at the first polishing position before coming into contact with the plate glass a. By moving to the first polishing position, the processing tool B can come into contact with the leading end portion a1 of the sheet glass a. Further, the sheet 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 disposed at the first polishing position contacts the leading end a1 of the glass sheet a conveyed in the conveying direction C. The working tool B is intended to be separated from the starting end a1 by this contact. At this time, the second cam follower 9b coupled to the second arm portion 3b of the arm member 3 contacts the second cam surface 8b of the cam member 8. This restricts the movement of the second arm portion 3B in the separating direction, and accordingly, the working tool B is also restricted so as not to be separated from the end surface of the plate glass a. Thus, the machining tool B can continue the machining of the end face with the machining allowance D (grinding allowance) while maintaining the contact with the end face of the plate glass a.

The pressing force generating section 5 generates a pressing force until the machining tool B comes into contact with the starting end portion a1 of the sheet glass a, and thereafter, continues to apply the pressing force until the machining tool B reaches the terminal end portion a 2.

When the polishing in the first polishing position is completed (the processing tool B moves by the initial polishing distance L), the plate glass processing apparatus 1 changes the processing tool B to the second polishing position. Specifically, the glass sheet processing apparatus 1 rotates the cam member rotating motor 10 while maintaining the contact of the processing tool B with respect to the glass sheet a. The cam member 8 is rotated to the third rotation phase by the driving of the cam member rotating motor 10. The machining 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 polishing while being in contact with the end face of the plate glass a.

In this polishing, when an impact force acts on the processing tool B from the end surface of the plate glass a due to undulation caused by fine irregularities present on the end surface of the plate glass a, the pressing force generating portion 5 generates a pressing force acting on the end surface of the plate glass a from the processing tool B, and the buffer portion 6 buffers the impact force.

Finally, when the machining tool B reaches the terminal end a2 of the sheet glass a, the sheet glass machining apparatus 1 moves the machining tool B to the retracted position, and ends the polishing. Specifically, when the machining tool B reaches the terminal end portion a2 of the sheet glass a, the cam member 8 is rotated to the fourth rotational phase by the driving of the cam member rotating motor 10. The machining tool B moves in the separating direction to the retracted position in conjunction with the cam member 8 rotated to the fourth rotational phase. At the retracted position, the arm member 3 is in a locked state, and the working tool B cannot move freely.

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

According to the plate glass processing apparatus 1 of the present embodiment described above, the open-loop control type synchronous motor 2 is used as the motor for driving the processing tool B, and the processing tool B is driven to rotate by the control of the motor, whereby the jumping-up of the processing tool B at the start of processing can be prevented. That is, since the synchronous motor 2 is not feedback-controlled as in the case of the servomotor, even if the machining tool B comes into contact with the leading end portion a1 of the plate glass a, the control for rapidly increasing the output torque as in the case of the servomotor is not performed. This prevents the machining tool B from repeatedly jumping up when the machining is started when the machining tool B is driven by the servomotor.

The stroke S of the processing tool B is limited by the position control portion 7 so as not to be separated (0.03mm to 0.05 mm) from the end surface of the plate glass a while polishing is performed by the initial polishing distance L (a distance of 5mm to 40mm from the start end portion a 1). This enables the sheet glass processing apparatus 1 to more effectively prevent the machining tool B from jumping up when the machining is started.

The present invention is not limited to the configuration of the above embodiment, and is not limited to the above operation and effect. The present invention can be variously modified within a scope not departing from the gist of the present invention.

In the above-described embodiment, the first rotational phase is 0 °, the second rotational phase is 45 °, the third rotational phase is 120 °, and the fourth rotational phase is 240 °, but the present invention is not limited thereto. The first to fourth rotational phases can be set as appropriate according to the need for controlling the operation of the machining tool B.

In the above embodiment, α 2 is 1 °, but may be other than 1 °. Further, α 1 is 1 ° or less, but may be 1 ° or more as long as it is smaller than α 2. Further, β is the same angle as α 2, but β may be an angle different from α 2.

In the above-described embodiment, the grinding wheel is exemplified as the machining tool B, and the machining tool B grinds the end face of the plate glass a. As long as the end face of the plate glass a can be processed, a processing tool B other than a grinding wheel can be applied.

Wherein the reference numerals are as follows:

1: a sheet glass processing device; 2: a synchronous motor; 3: an arm member; 4: a support shaft member; 5: a pressing force generating section; 7: a position control unit; a: plate glass; b: and (6) processing a tool.

Claims

1. A plate glass processing apparatus for processing an end face of a plate glass by using a processing tool,

the plate glass processing device is provided with:

an open-loop control type synchronous motor that rotationally drives the machining tool;

an arm member that rotatably supports the processing tool;

a support shaft member that rotatably supports the arm member;

a pressing force generating unit that generates a pressing force applied from the processing tool to an end surface of the plate glass by applying a couple to the arm member; and

a position control unit that controls a position of the processing tool with respect to the end surface of the plate glass,

the position control unit limits a stroke of the processing tool to a predetermined value so that the processing tool does not separate from the end surface of the sheet glass during a period from when the processing tool comes into contact with the start end portion of the sheet glass to when the processing tool relatively moves by a predetermined distance on the end surface of the sheet glass,

when the position of the machining tool during a period from the time when the machining tool is in contact with the starting end portion of the sheet glass to the time when the machining tool is relatively moved by a predetermined distance on the end surface of the sheet glass is set as a first polishing position, and the position of the machining tool, which continues to polish the end portion of the sheet glass after the machining tool is relatively moved by the predetermined distance at the first polishing position, is set as a second polishing position, the stroke of the machining tool at the first polishing position is set to be smaller than the stroke of the machining tool at the second polishing position.

2. The sheet glass processing apparatus according to claim 1,

the stroke of the processing tool at the first grinding position is limited to be more than 0.03mm and less than 0.05mm,

the stroke of the processing tool at the second grinding position is limited to 3mm or less.

3. The sheet glass processing apparatus according to claim 1 or 2,

the predetermined distance by which the processing tool moves relative to the plate glass is 5mm to 40 mm.

4. The sheet glass processing apparatus according to claim 1 or 2,

the machining allowance during the relative movement of the machining tool with respect to the plate glass by the predetermined distance is 0.03mm to 0.05 mm.