Formation of elongated glass components with low bow using a gripper device

Patent metadata

Field	Value
Publication number	US-10590022-B2
Application number	US-201515542199-A
Country	US
Kind code	B2
Filing date	Jan 22, 2015
Priority date	Jan 22, 2015
Publication date	Mar 17, 2020
Grant date	Mar 17, 2020

Abstract

Apparatus and method for producing elongated glass components with low bow. The apparatus may include a heating element to heat a bulk glass component where a strand may be drawn from the bulk glass component in a downward direction and a gripper device including a clamping element to support the strand while pulling or drawing it from the bulk glass component in a linear motion, and a low-friction mounting element attached to the clamping element which allows translational movement of the clamping element in an x-y plane. The gripper device may further be used to reduce bow in the strand while it is being drawn by moving the clamping element on the mounting element in a direction opposite the direction of any measured transverse acceleration.

First claim

What is claimed:

1. An apparatus for forming an elongated component of glass with low bow, the apparatus comprising:
a heating element to heat a bulk glass component such that a strand may be drawn from the bulk glass component in a downward z direction;
a sensing element capable of locating a center axis of the strand;
a force sensing device; and
a gripper device in communication with the sensing element, wherein the gripper device comprises:
clamping elements in communication with the force sensing device to support the strand and move linearly with the strand while it is drawn from the bulk glass component, wherein the clamping elements are capable of aligning in a first position on a strand wherein the first position is at about the center axis of the strand, and
mounting elements attached to the clamping elements, wherein the mounting elements allow translational movement of the clamping elements to any position in an x-y plane,
wherein the clamping elements will deflect along the mounting elements back to the first position when a force is sensed by the force sensing device while the strand is drawn from the bulk glass component.

2. The apparatus of claim 1 , wherein the mounting element comprises an x-y table including a pair of arms mounted on linear bearings or linear rails.

3. The apparatus of claim 2 , further comprising a motor to control movement of the pair of arms.

4. The apparatus of claim 1 , wherein the mounting element further comprises a locking mechanism, wherein when the locking mechanism is disengaged the clamping element may float freely on the mounting element and when the locking mechanism is engaged the clamping element is fixed in position.

5. The apparatus of claim 1 , wherein the force measuring device comprises a load cell.

6. The apparatus of claim 1 , further comprising one or more additional gripper devices substantially similar to the gripper device.

Assignees

• Heraeus Quartz North America Llc
• Heraeus Quarzglas

Inventors

• Fattal Georges Levon
• Beavers Jr James E
• Ganz Oliver
• Chang Kai Huei

Classifications

• C03B23/047 Primary

  by drawing ({C03B23/091} , C03B37/025 takes precedence) · CPC title

• C03B23/045 Primary

  Tools or apparatus specially adapted for re-forming tubes or rods in general, e.g. glass lathes, chucks (C03B23/043 takes precedence) · CPC title

• C03B37/0124

  Means for reducing the diameter of rods or tubes by drawing, e.g. for preform draw-down · CPC title

• C03B37/01225

  Means for changing or stabilising the shape, e.g. diameter, of tubes or rods in general, e.g. collapsing · CPC title

• C03B37/025

  from reheated softened tubes, rods, fibres or filaments {, e.g. drawing fibres from preforms (draw-down of tubes, rods or preforms to reduced diameter preforms C03B37/0124)} · CPC title