DRILLING MACHINE FOR GLASS PANES

Abstract: The invention refers to a drilling machine for glass panes, which comprises a series of tool-bearing spindles (3) set side by side and mounted on horizontal carriages (1 and 2) located one in the upper part for upper drilling and one inverted, in the lower part, for lower drilling (Figure 1).

Description: DRILLING MACHINE FOR GLASS PANES DESCRIPTION Glass panes in general are drilled with dual-head machines, with an upper head and a lower head, using diamond tools of the same diameter. The drilling cycle takes place in two phases: rapid approach of the two tools to the glass, and shift, at about 1 mm from the glass, to slow advance for drilling with the two tools at the same time. The lower tool penetrates only one part of the glass whilst the upper one completely drills through. The positioning of the two opposite tools conducted in the horizontal plane allows to obtain a high precision, equalling that of fixed head drills . The invention consists of applying to the machine a series of tool-bearing spindles, set side by side and with the tools mounted and adjusted in such a way as to drill holes of different diameters on the same pane without having to replace the tool. ) The drilling machine described herein can bear, instead of the compass saws, also mills which execute "the notches required in some panes. On the same spindle can be mounted, together with the mill, also a throat or trapezoid grinding wheel to grind the milled notch. During the milling and grinding operation, the pane is held in position by a series of rollers with related pneumatic cylinder. The head is positioned according to the program which stops it in the starting point of the milling operation. The notch is obtained using the displacement of the drilling machine and the transverse motion of the carriage. The numerical control co-ordinates the two movements which effect the notch with the glass pane motionless in the starting point of the milling operation. The accompanying drawings show Figure 1 a front view of the two tool-bearing carriages, Figure 2 the section of the spindle advance assembly, Figure 3 a top view of a drilling machine with dual drill, Figure 4 a front view of the machine according to Figure 3, Figure 5 an enlarged section of a spindle (upper or lower) with related pivoting lever. In Figure 1, the upper tool-bearing carriage (1) and the lower carriage (2) are provided by way of example with seven spindles (3) . Figure 2 shows the perfect identicalness of the two carriages 1 and 2 and of the advance assembly 4 and 6 of the upper and lower spindles. Figures 3 and 4 show a drilling machine with dual drill 6 and 7 able simultaneously to drill holes on both sides of a glass pane positioned on the plane of advance 8. In Figure 5, the reference number 9 indicates a spindle, 10 the attachment of the spindle, 11 a ball bearing that facilitates the insertion of the fork 12 into the attachment 10, 13 the thrust lever of the spindle and 14 the fulcrum for the lever. The tool-bearing spindles are positioned on two horizontal carriages located one in the upper part for upper drilling and an inverted one, in the lower part, for lower drilling. The two carriages are translated simultaneously, to bring the two tools of the same diameter mounted on two of the opposite spindles, at the centre of the drilling axis, this movement is effected with precision transmission gear which guarantee the concentricity of the two holes . Another feature of the invention is the exploitation of the advancing assembly of an upper spindle and that of a lower spindle to advance all the spindles of the same carriage. In practice the two advancing assemblies, an upper one and a lower one, impart the motion to a lever with its fulcrum in the centre and open at the end near the spindle. All spindles that are positioned at the centre of the drilling axis bear a pivot inside the housing of the lever, taking its motion. The electronic system controls all spindles individually and it will correctly issue the commands for the various phases pertaining to the approach, the drilling operation and the return to the rest position. Each drilling machine can therefore be provided with one or two drills with at least two or more spindles.

Claims: Claims The drilling machine for glass panes, characterised in that it comprises a series of tool-bearing spindles (3) set side by side and mounted on horizontal carriages (1 and 2) located one in the upper part for upper drilling and one inverted, in the lower part, for lower drilling. The drilling machine for glass panes, as claimed in claim 1, characterised in that the two carriages (1 and 2) are translated simultaneously to bring the two tools of a same diameter mounted on two of the opposite spindles, to the centre of the drilling axis. The drilling machine for glass panes, as claimed in claims 1 and 2, characterised in that each spindle (9) is provided with a support (10) which bears a ball bearing (11) that facilitates the insertion of the fork (12) of the lever (13) . The drilling machine for glass panes, as claimed in claims 1 through 3, characterised in that an electronic system individually controls all spindles and issues commands for the various phases of approaching, drilling, and returning to the rest position.

Inventors: BESANA ANNIBALE, STANCO DOMENICO, BESANA, ANNIBALE, STANCO, DOMENICO
Applicants: BESANA ANNIBALE, C M B COSTRUZIONI MECCANICHE B, STANCO DOMENICO, BESANA, ANNIBALE, C.M.B. COSTRUZIONI MECCANICHE BESANA S.R.L., STANCO, DOMENICO
Application year: 2001
Main classification: B23B39
IPC codes: B23B39