Patent GB-330290-A (GB)
Title: Apparatus for coating glass sheets
IPC: C03C17/00
Filed: 1929-03-05
Abstract: 330,290. Munro, Ltd., R. W., and Wilson, J. F. March 5, 1929. Coating - machines. - In apparatus for coating glass or other sheets in which the sheets are conveyed under yielding pressure between coating and presser rollers, the coating roller 8 and a doctor roller 9 for transferring the coating fluid to the coating roller are mounted in an adjustable bearing support 10. In one form, Figs. 1 and 2, the sheets are carried through the apparatus on an endless conveyer 1 of wire gauze stretched between two rollers, one roller 2 being adjustably mounted on the end of the frame by means of screws' 4 having nuts to allow the tension of the conveyer to be adjusted. Rollers 65 on each side bear on the underside of the conveyer 1 and are each carried by a pivoted arm 66 fixed by a bolt 68 passing through a slot in the arm to allow the rollers to be raised or lowered enabling, together with the adjusting screws 4, the conveyer to be kept in a central position. Pressure boards may be provided under the conveyer. The glass sheets are first carried under a cleaning device which may consist of a trough 5 containing alcohol &c. and a linen &c. strip 6, clamped between the cover 7 and edge of the trough 5, which keeps moistened with alcohol and trails on the sheets. The bearing blocks 10 for the coating roller 8, which is preferably rubberfaced, and the doctor roller 9 are adjustably mounted on the frame 3 to allow for sheets of different thicknesses. The blocks rest on collars 11 on screws 12 having lock nuts 13 and are pressed thereon by screws 14 having collars fitting into recesses in the blocks. The spindle 17 of roller 8 has eccentric collars 18 resting in recesses in the blocks 10 provided with bearings caps 19. The collars 18 are cross-connected by a yoke 20 to which are connected springs 21 the other ends of which are attached to adjustable hooks 21' on lugs 22 on the blocks 10. The springs 21 tend to rotate collars 18, pressing the roller 8 towards the roller 9 and their relation may be varied, to allow for the nature and amount of coating liquid to be applied, by moving the yoke 20 by hand. A scale 23, Fig. 6, may be provided to indicate the adjustment, the yoke 20 being fixed in position by a clamp 24. The rollers 8, 9 have gear wheels 29, 28 in engagement, and are rotated by a gear wheel 30 engaging wheel 29 and provided with a wheel or sprocket 31 driven from a convenient source. The spindle 32 of wheels 30, 31 is carried in a slotted bearing 33 on the frame and can be adjusted when the blocks 10 are raised or lowered, and locked in position by a clamp 34. The roller 9 dips into a trough 25 containing the coating liquid, excess liquid being removed from the roller by a scraper 26 having a handle 27. Inclined channelled scrapers 39, Figs. 2, 4, collect any overflow of liquid from the ends of the channel between rollers 8, 9 and return it to the trough, each scraper having a fork 70 which is attached to the edge of the trough 25 by a screw 71. The glass sheets are pushed against the coating roller 8 by presser roller 36 carried in bearings 37 held in blade springs 38. To ensure even distribution of the liquid and to finish off blobs, the coated sheets preferably pass under a wiper which may consist of a rubber or other flexible wiper 40 carried by a spindle. 41 in bearings 42 and provided with handles 43. In a modification, Fig. 5, the conveyer is formed of two portions 1', 1<11> leaving a gap below the coating roller 8. In a further form, Fig. 7, the conveyer comprises a series of rollers 44 driven by an endless chain 45 engaging with sprockets 46 on the rollers and passing over wheels 47. The coating roller 8 is mounted in small bearing blocks 48 which are locked in slots' in the bearing blocks 10 by pins 49. The blocks 10 rest on collars on screws 12 and are pressed thereon by springs 50 abutting at their upper ends against nuts 51. The doctor roller 9 is carried on bearing levers 52 pivotally connected at 54 to the blocks 10. Screws 56 pass freely through levers 52 and screw into brackets 55 on the blocks 10, springs 57 on the screws 56 pressing the levers forward to press the roller 9 towards the roller 8. The space between the rollers is adjusted by screws 58 engaging with stops 59 on the brackets 55. The blocks 10 have distance pieces the nuts 63, 64 of which may be formed as handles for use in lifting the blocks 10 from the screws 12. The trough 25 for the coating liquid is supported at each end by plates 60 mounted on studs 61 and has a waterjacket 62 which is heated, for example, by an electric heater 62<1>. The conveyer roller 44 below roller 8 forms the presser roller, the springs 50 permitting the coating roller 8 to yield when necessary.