US2003267A - Machine for dusting sheet materials - Google Patents

Description

May 28, 1935. SMITH ET AL 2,003,267

MACHINE FOR DUSTING SHEET MATERIALS Filed Oct. 12, 1933 s Sheets-Sheet 1 May 28, 1935. s nr AL 2,003,267

MACHINE FOR DUSTING SHEET MATERIALS Filed Oct. 12, 1933 3- Sheets-Sheet 2 17W 6459/51 SM/M Comm/v SM/TH May 28, 1935. -e. SMITH r m.

MACHINE FOR DUSTING SHEET MATERIALS Filefi OCC- 1 1 53 3 Sheets-Sheet 3 Patented. May 28, 1935 UNITED STATES MACHINE FOR DUSTING SHEE MATERIALS Gabriel Smith and Colman Smith, Leyton,

. London, England Application October 12,

1933, Serial No. 693,359

In Great Britain March 21, 1933 2 Claims.

Inthe production of sheet material for use in making cartons, for example, where ornamentation is achieved by surface printing with a tacky medium and subsequent application thereto of powdered material, one of the difiiculties is to remove excess powdered material in a complete and satisfactory manner. Thus boards which leave a bronzing machine, for instance, although intended to be clean are Or may not always be so and therefore as a precautionary measure it is customary to dust the boards before passing them to other machines for further treatment. Only in this way can it be ensured that blemish in appearance shall be avoided, fouling of bearings or working parts in subsequent machines reduced and saving of material effected. Hand dusting is too laborious and slow so that the usual procedure is to run the boards through a machine normally intended for bronzing and dusting but not supplied with bronzing material, Such machines are expensive and do not justify their use for the minor purpose of dusting.

The object of the present invention is to provide a method of and machine for dusting boards such as referred to in an economical and rapid fashion and applicable for removing loosely adherent matter from one or other or both sides of sheet material in general.

To this end the invention consists in exposing 30 the surface of the material, whilst travelling rapidly, to suction intermediate of brushing operations of different degrees which respectively first lightly disturb the foreign matter and subsequently forcibly dislodge any particles which meanwhile may not have been removed by suction, in order that they also shall be removed by suction.

A machine for the purpose aforesaid consists of a construction of feed rolls, brushing and suc- 40 tion means, part of the brushing means being in advance of, and part behind, the zone exhausted by the suction means.

One constructional form of the improved machine is illustrated in the accompanying drawings, where Fig. 1 is a side view partly in elevation and partly in section, Fig. 2 a sectional elevation at right angles to Fig. 1 and Fig. 3 a plan view with parts removed. Fig. 4 shows part of Fig, 1 to a larger scale and Fig. 5 is an'elevation of part of Fig. 4 taken at right angles thereto.

As here shown a feed table I and a delivery table 2 are arranged at opposite sides of two narrow suction nozzles 3, 3*- extending the full width of the tables and each equipped at the orifice with bristles instanced as a stationary brush or maturing the material.

4 and a rotary brush 5. The brushes 5 of the two nozzles 3, 3 are located one above the other and are geared together by spur wheels 6 so that they rotate in opposite directions. Branch pipes 1, 1 respectively connect the nozzles 3, 3 to the inlet 5 of an exhauster 8, which discharges by pipe 9 to a cyclone or other suitable dust extractor l0, whereof II is the storage receptacle. Sheets placed upon the table I are fed by being gripped between collars 12 upon upper and lower spindles I3, M at one side of the nozzles, the delivery being continued by a similar set of gripping collars l2? upon spindles I 3 I 4 at the other side of the nozzles. These collars constitute the feed rolls referred to, which being narrow, can collect little or no dust. The machine is exemplified as equipped with an electric motor l5 driving, by belt, a shaft i6. This shaft drives through a. spur wheel I! a wheel l8 upon a further shaft l9, the said wheel l8 meshing with wheels 20, 20 upon the spindles l4, Il The upper spindles I3, I3 are not positively driven but merely frictionally rotated through the collars 12 therein; the 'spindle l 3 at the right hand side of Fig. 1 has its bearings in a frame 2| pivoted at 22 to the machine so that it can be readily moved into and out of position. The shaft l9 further drives, through chain and sprocket gearing 23 the spindle of the lowermost rotary brush 5, the direction of brush rotation being opposed to that of the direction of feed of the material to the machine. 24 is a fence to guide the sheets upon the table I and 25 (Fig. 2) represent screws to enable the collars I2, 12*- to be fixed at different positions along their spindles.

A machine according to the invention may be driven at such a speed that it is capable of dealing with the output of more than one gripper feed or other slow operating machine, and although shown as adapted for treating both sides of material, may obviously have only one nozzle and brushing means to dust only the upper or the lower side of sheets. In the case of a machine for dealing with say carton-making boards received from a bronzing machine, the feed rolls, brushing and suction means may be associated with other board treating means capable of being operated in as rapid a manner, such as means for calendering, burnishing, embossing, slitting 50 As illustrated, the machine has two pairs of rolls 26 internally heated by gas supplied under pressure through the pipe system 21, the lowermost roll of each pair being rotated by wheels 28, 29 which mesh with a common wheel 30 of appropriate width driven from the wheel [8 by gearing 3|.

What we claim is:-

l. A machine of the character described, comprising in combination, a feed table and a delivery table, a suction space between the two tables through which material is passed from the former to' the latter, means between the feed table and said suction space and like means between said space and the delivery table for feeding the material as stated, opposed stationary brushing means between the first of said feeding means and the applied suction area and opposed movable brushing means between said area and the second of said feeding means between each of which the material is directed in feed movement; said stationary and movable brushing means being both contained within a chamber providing the suction space, and said suction space being connected with means for the application of suction at both sides of the material passed therethrough.

2. A machine for removing powder from sheet material, comprising in combination, a feed table for the material and a delivery table therefor, a chamber providing a suction space through which the material is passed from the feed table to the delivery table, roller means between the feed table and said chamber and between said chamber and the delivery table for feeding the material from the one table to the other, a pair of opposed stationary brushes in the entrance side of said chamber between which the material is first passed in transit therethrough and a pair of opposed rotary brushes in the exit side of said chamber between which the material is last passed in emergence therefrom; said suction space being formed intermediate the two pairs of brushes arranged in proximate relation to each other within the chamber; means for applying suction to said space at both sides of the material passed therethrough, and means for actuating said feeding and said rotary brush means.

GABR'IEL SMITH. COLMAN SMITH.

Images