USRE20687E - For cutting paper and other fibrous materials - Google Patents

Description

Re. 20,687 R APPLIANCES S GROZIER TING DUST AND FLUFF FROM MACHINES 0 April 5, 1938. H.

MEANS FOR ARRES FOR CUTTING PAPER AND OTHER FIBROUS MATERIAL Original Filed Feb. 7, 1933 5 Sheets-Shept 1 GROZIER Re. 20,687

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'T 16 r s 'INVNTQJQ Original Filed Feb. '7, 1955 FOR CUTTING PAPER AND OTHER FIBROUS MATERIALS April 5, 1938. H

MEANS FOR ARRESTING DUST AND FLUFF FROM MACHINES OR APPLIANCES Re. 20,687 MEANS FOR ARRESTING DUST AND FLUFF FROM MACHINES OR APPLIANCES April 5, 1938. T. H. GROZIER FOR CUTTING PAPER AND OTHER FIBROUS MATERIALS Original Filed Feb.. 7, 1933 3 Sheets-Sheet 3 Reissued Apr. 5, 1938 UNITED STATES PATENT OFFICE FROM MACHINES OR APPLIANCES FOR CUTTING PAPER AND OTHER FIBROUS MATERIALS Thomas Hamilton Grozier, Greenwich Point, Sydney, New South Vales, Australia Original No. 1,986,726,

dated January 1, 1935, Se-

rial No. 655,638, February 7, 1933. Application for reissue December 11, 1936, Serial No.

8 Claims.

This invention relates to improved means for arresting and collecting dust, fluff and other finely divided or cut particles formed by machines in sawing, cutting or slitting newsprint or other papers, cardboard, cloth, leather, wood and other relatively light and fibrous materials.

Machines employed for cutting, slitting, sawing or otherwise working such relatively light and fibrous materials generally operate at comparatively high speed with the result that dust and fluff, shortly cut hairs and other small particles are thrown by the rapidly moving cutting tools with considerable velocity into the surrounding air. Owing to their lightness and small size, such particles float about in the atmosphere and settle slowly upon machinery, manufactured stock, materials and other objects in the vicinity of the machines, thereby necessitating cleaning and removal of the precipitated fine dust or par- H) ticles at comparatively frequent intervals. Moreover, the air-borne dust and other finely cut or divided particles are inhaled by persons operating the machines or engaged in their vicinity, and such persons in course of time have their health and physical fitness impaired if not seriously affected thereby.

In order to overcome the disadvantages attending the operation of high speed cutting machines in working fibrous materials of the kind referred 30 to, there has been proposed an extensive independently driven dust exhausting plant, which is connected by conduits to the said cutting machines of a factory installation. Such a dust exhausting plant with the necessary conduits, fit- 55 tings and prime mover (or plurality thereof) is of high initial cost and is also expensive in oper ation and maintenance while being relatively inefflcient in many cases.

An object of the present invention is to provide simple means of comparatively small cost for arresting and collecting dust and finely comminuted particles which render unnecessary the installation of such extensive and high-priced dustexhausting plant in a factory wherein machines are used for cutting, sewing, slitting or otherwise working fibrous materials.

Another object of the invention. is to provide simple and inexpensive dust arresting and collecting means which are capable of operating at less cost and at higher efficiencies than the large and expensive dust-exhausting plants hitherto used for dust removal purposes.

A further object of the present invention resides in the provision of simple and inexpensive means which are adapted to arrest and totally re- In Australia March 3, 1932 move the dust, fluff and other small portions or particles of matter at their points of origin or generation and as fast as they are formed so that they cannot be thrown into the surrounding atmosphere or mechanism by the high-speed. cutting tools.

Yet another object of the invention is to provide simple and inexpensive means which are adapted to arrest, segregate and collect dust, flufi, shortly cut hairs, and other finely cut, comminuted or pulverized particles or portions of materials having a commercial value with high collective efficiency.

A still further object of my invention resides in the provision of simple and inexpensive means for arresting, segregating and collecting small particles or portions of light fibrous materials which means are especially adapted for application to and use with newspaper and magazine printing machines, paper cutting machines, and circular saws of portable and/ or stationary bench type.

In operating high speed rotary web printing machines much time is wasted on editions because of the generation of paper dust, fiufi, and minute particles at the web slitters, or paper cutting tools. Such dust and fiufi are responsible for general uncleanliness in, over, and around the said printing machines. This condition results in more or less frequent cleansings and/or wash-ups on account of stereotype plates, inking cylinders and. rollers becoming filled and/or smothered with finely divided, comminuted, and precipitated particles of paper. Otherwise, it is reflected in inferior printing, more especially in connection with half-tone illustrations and the like pictorial matter which occupy, today, a position of prime importance in newspapers, periodicals, or magazines. By means of my present invention the whole of said slitter-generated paper-dust or fluff is definitely arrested at its point or points of origin and afterwards immediately segregated and collected. Furthermore, my devices become and/or form an integral portion or component of a rotary web printing machine or the like mechanism or appliance.

In accomplishing the above mentioned objects of the invention, air circulating means are mounted on and operated by a machine used for cutting, sawing, slitting or otherwise working light fibrous materials, in any of which operations dust, fluff, or other small particles or portions of matter are formed in less or greater quantity. The air circulating means are adapted to suctionally draw air into and through arresting means positioned in the immediate vicinity of the cutting tools. A strong air current is induced into the arresting means by said air-circulating means, and the air in passing through the arresting means becomes charged with dust or other small portions or particles of material. The dust-laden air is sectionally drawn or impelled by the aircirculating means through a dust extracting and collecting chamber positioned. on or near the machine and having separating means whereby the dust is segregated and extracted from the air and precipitated within the said chamber. The air, after extraction of the dust or other particles therefrom, is discharged at desired locations into the atmosphere.

The air-circulating means may be positioned either adjacently to or apart from the cutting tool of a machine. In many instances it may be arranged to rotate with the cutting tool and it may be mounted with the cutting tool in a casing which also functions as an arresting box and is connected by a conduit with the dust-extracting and collecting chamber.

Reference being had to the accompanying explanatory drawings:

Fig. 1 is a plan view showing the invention applied to a rotary Web printing machine.

Fig. 2 is a transverse section on theline 2--2 in Fig. 1.

Fig. 3 is a sectional view taken on theline 33 in Fig. 1.

Fig. 4 is a transverse section on theline 44 in Fig. 1.

Figure 5 is a sectional view on the line 55 in Fig. 4.

Figure 6 is a plan of an alternative form of the invention applied to a rotary web printing machine.

Figure 7 is a transverse section taken on the line 'I-1 in Fig. 6.

Figure 8 is a side elevation detailing the slitter and fans casing shown in Fig. 7.

Figure 9 is a front elevation detailing the slitter, slitter shaft, fans casing and suction tube shown in Fig. 7.

Figure 10 is a side elevation of a further detail of the fans shown in Figs. 7 and 9.

Figure 11 is a side elevation of a modification of the invention as applied to machines used in cutting paper, cardboard, or other fibrous materials.

Figure 12 is a sectional view taken on the line I2l2 of Fig. 11.

Figure 13 is an enlarged sectional elevation of the saw, fan, casing and delivery tube, and is a detail of Fig. 11 on a larger scale.

Figure 14 is a. sectional elevation of the inventiorr as applied to a stationary circular saw bench.

Figure 15 is a sectional view taken on line I5-l5 of Fig. 14.

Referring more particularly to Figures 1 to 5 of these drawings, I indicates a Web-roller of a printing press having formed therein aslot 2 which co-operates with a rotary cutting blade orslitter 3 to sever a web of paper as it passes around the periphery of the roller I.

Adjustably mounted in a dust arresting casing orbox 4 is arod 5, the extremity of which projects into theslot 2 and is shaped to form acleaning blade 6 adapted to dislodge from said slot dust and fine particles formed in cutting the paper web W (see Fig. 4). The arrestingbox 4 is positioned closely to, but out of contact with, the roller I, there being a narrow opening or clearance space I between said box and roller. The arresting box may be mounted upon a tube 8 which may be square in section and conveniently substituted for the solid square bar customarily provided on certain printing machines, or alternatively such tube may be of any suitably shaped section and/or in the form of an addition thereto. The top and side of the portion of the tube 8 Within the arrestingbox 4 are removed to afford free communication between said box and tube, see Figures 4 and 5. I

The square tube 8 is provided with holes 9, some of which are made in the lower side of the portion of the tube Within the arrestingbox 4 and are covered by gauze or mesh I0, while others of said holes are formed in said tube adjacently to but exteriorly of the arrestingbox 4. The tube 8 is connected by a tubular extension I I to a dustextracting and collecting chamber I2 which is associated with a casing l3 by a tubular connection I4.

Within the casing I3 is a fan l5, see Fig. 3, which is mounted on a spindle I5 and is rotated at high speed by gears IT and I8, the latter gear being conveniently fixed to the shaft IQ of another web-roller of the printing press. The said roller may be driven by the paper-web, or, alternatively, by connected gearing.

The tubular connection I4 is attached to the casing I3 so as to be disposed in co-axial alignment with the fan spindle l6, see Fig. 3, and said connection forms the suction inlet to the fan I5. The connection I 4 communicates with the atmosphere by way of the dust-extracting chamber I2, tubular extension I I, square tube 8, holes 9 and narrow openings 1, so that when the fan I5 is in operation a strong current of air will be drawn inwardly through the narrow openings I and the holes 9 situated both within and without thebox 4. The air then passes through the tube 8, tubular extension II, dust-extracting chamber I2 and tubular connection I 4 into the casing I3 from which it is ejected by the fan I5 through anoutlet 2! in said casing into the atmosphere.

The operation of my invention is as follows:

When paper is being severed by the co-operation of theslitter 3 and theslot 2, dust and minute scraps of paper are liberated in the arrestingbox 4 and are carried by the strong current of air induced by the fan I5 tube 8 and extension I I into the extracting and I2. This chamber is provided with one ormore partitions 22 having therein are extracted by the mesh orgauze 24 and are deposited within the chamber I2 from which they are removed, as and when required, through a suitable opening lation of acover 26 therefrom.

The air after passing through the mesh orgauze 24 is free of dust and fine particles, and it is discharged back into the atmosphere through theoutlet 2| of the fan-casing I3. In this manner, dust and small particles of materials, generally of commercial value, may be collected and prevented from passing into and fouling the surrounding atmosphere and also the components of a rotary web printing machine without in any way reducing its efiiciency of operation. On the contrary, the efliciency of such machines is increased thereby because fewer cleansing operations are required and, moreover, cleaner printing results from the use of this invention.

through the upon removal or manipu- Attention being directed more particularly to Figs. 6 to 10 of the drawings, theslitter 3 and fans l5 and l5a, instead of being spaced apart and independently operated, are encased in ahousing 21 and fixed upon a press drivenslittershaft 28 rotatably mounted in said housing. Theslitter 3 is preferably mounted between the fans l5 and I5a in a central position, and said fans are provided withblades 29 which may be positioned on opposite sides of theslitter 3 in staggered relationship as shown in Fig. 10, or in any other preferred manner.

Thecasing 21, which may be made in two parts, see Fig. 6, is positioned closely to, but out of contact with, the web-roller I as shown in Fig. 7. The said casing is provided withwalls 30 havingair ports 38a and 30b formed therein, and theslitter 3 projects through anarrow slot 31 formed in the said walls.

Atube 32 is connected to thecasing 21 in coaxial alignment with theslitter shaft 28, and said tube is connected with an extracting and collecting chamber I2 constructed as previously described. The chamber I2 is connected to the square tube 8 which carries anarresting box 4 and cleaningrod 5 andblade 6 constructed as hereinbefore described. Additional air holes 9 may be provided in the upper parts of the ends of the arrestingbox 4 or formed in the square tube 8 as previously described, see Figs. 5, 6 and '7, to ensure turbulence of the air in said box and consequent efiective scouring of the same.

In operation, theslitter 3 severe a web of paper passing over the roller l, and at the same time the fan l5, which rotates with theslitter 3, induces a powerful blast of air through the holes 8 into and through the arrestingbox 4, tube 8, extracting and collecting chamber [2, andtube 32 into thecasing 21. The air, so induced into thecasing 21, is expelled through anoutlet 33 into the atmosphere. In its passage through the arrestingbox 4, the air becomes charged with dust and minute particles of paper which are segregrated and deposited in the chamber I2 so that the air enters thecasing 21 free of dust. Instead of the extracting and collecting chamber [2 being positioned between the arresting box and thecasing 21, said chamber having anair outlet 2| may be attached to theoutlet 33, and the tube 8 may be connected to thetube 32 by a bent pipe or conduit 34, as shown by chain-dotted lines in Fig. 6. The fan I5a, which also rotates with theslitter 3 and fan l5, operates directly upon the saidslitter 3 and that section of the webroller l surrounded by thecasing 21, functioning in such manner as to induce a continuous current of air through theair ports 30a and 38b into thecasing 21. The air is then expelled through theoutlet 33 into the extracting and collecting chamber I2 and then through the outlet 2i into the atmosphere as previously described. Any dust or minute particles of paper which may segregate or become deposited within that portion of thecasingv 27 surrounding the web-roller l is thereby arrested, extracted and collected in said chamber l2.

Reference being had to Figures 11, 12 and 1.3 of the drawings, 35 indicates a circular saw, such as is used in machines for cutting paper webs or sheets, cardboard or other fibrous materials. The saidcircular saw 35 is fixed upon aspindle 36 of a direct coupledelectric motor 31, or said saw may be gear driven by themotor 37. Thesaw 35 is mounted in acasing 38, and said saw projects through aslot 39 formed in the base of the said casing. Mounted on opposite sides ofpered outlet 44, to which is connected a flexible tube attached to an extracting and collectingchamber 12 having anair outlet 2| and constructed as hereinbefore described.

Thecasing 38, saw 35 and electric motor 31 (forming a portable saw equipment) may be suspended in the manner usual in paper web or sheet cutting machines and/or the like appliances, as for example, byrods 46 which depend fromtrolleys 4! mounted on arail 48 supported in an elevated position bystandards 49.

In operation, thehousing 38 is moved along a laminated plurality of paper-webs W or like fibrous materials, thesaw 35 being driven by the electric motor 3'! and cutting the paper-webs W as it travels. Dust formed by thesaw 35 in cutting the paper is drawn upwardly by the saw teeth into thecasing 38 and centrifugally collected by the air currents generated by thefans 4| and Ma, which preferably pass through the envelopingair passage 43 andinlets 42 and 42a into I thecasing 38. The dust-laden air is impelled from thecasing 38 through thetube 45 and the dust extracting and collecting chamber I2, from which the dust-freed air escapes back into the atmosphere through an opening oroutlet 2! formed at any approved location therein.

In Figures 14 and 15 of the drawings, 58 indicates the table of a stationary saw-bench having therein anarrow slot 5| through which projects acircular saw 52. Thesaw 52 is enclosed within acasing 53 secured to the underside of the sawbench table and is fixed upon aspindle 54 mounted upon outside bearings 55. Suitably mounted upon opposite sides of thesaw 52 arefans 58 and 5'], the latter fan being enclosed within aninner casing 58. Thecasing 53 hasair inlets 53 and Ell formed in the sides thereof, whilst the inner casing is also provided with anair inlet 6!, preferably in alignment with theinlet 59 formed in the wall of thecasing 53. air inlet 68 comprises an adjustableflanged tube 62, which extends into thecasing 53 as shown in Figure 15. If desired, an adjustable flanged tube 52a may be readily inserted within theinlet 59, as shown in chain-dotted lines. Thecasing 53 is provided with a tangentially disposed tapered tubular outlet 63, within which is anozzle 64 forming an extension of theinner casing 58. To the underside of the table 50 there may be fixed a lining 65 of felt or like material which is positioned closely to, but out of contact with, thesaw 52 so that dust and fluff may be prevented from passing out through theslot 5|, and the top flanges of thecasing 53, more especially when the said table, slot and easing are imperfectly fitted or shaped.

When thesaw 52 is in operation and thefans 58 and 51 are rotating therewith, theformer fan 58 sets up turbulence within thecasing 53 and causes whirling of the dust and fluff therein while the fan 5'! draws the dust and fluff charged air through theinlet 6! into theinner casing 58. The dust and fluff charged air is expelled by the The fan 5'! through thenozzle 64 into the tapered 7 tubular outlet 63 in which the strong jet of air escaping from said nozzle sets up evacuative action and causes a lowering of the pressure within thecasing 53. The fall of pressure within thecasing 53 causes air to pass downwardly through theslot 5| and through the clearance space between thesaw 52 and the felt lining 65, the downwardly moving air carrying with it the dust and fluff formed by thesaw 52 into thecasing 53, from which said dust and fluff are ejected by the fan 51 in the manner above described. The tapered tubular outlet 63 may be connected to a dust extracting and collecting chamber I2 constructed as hereinbefore described so that the air may be freed of dust and flufif before being returned to the atmosphere.

In some cases, theinner housing 58 may be modified in shape as shown by dotted lines in Figure 14, so that thenozzle 64 may be directed towards the teeth of thesaw 52 to remove therefrom adhering particles of dust and fluff of more or less clinging or adhesive nature.

In the reference in the specification and claims to the term high speed, there is meant a web traveling at a speed having an approximate minimum of 750 feet a minute.

The improved means for arresting and collecting dust and other finely divided particles or shortly cut portions of matter described, is of simple construction and can be applied with equal facility to rotary web printing presses, paper cutting and similar machines during their construction, or to existing machines previously installed and now in use. Moreover, the invention is comparatively inexpensive and it will be found highly satisfactory for maintaining air in the precincts of a machine or machines operating on fibrous materials in a hygienic state; for keeping said machinery in a clean and efi'iciently operative condition and also for conveniently and reliably collecting finely divided particles or shortly cut portions having a commercial value.

What I do claim is:

1. In machines used in cutting paper, cardboard or other fibrous materials, embodying a suitable electric motor and a cutting element operated thereby; means for arresting and collecting dust, fluff, and minute particles formed by the cutting element comprising a casing enclosing the cutting element, a slot for the cutting element in the casing, fan blades mounted on both sides of the cutting element, an air inlet in the casing, an outlet on the casing, a dustextracting and collecting chamber, a conduit connecting the outlet of said casing with the said chamber, and an air outlet on the dust-extracting and collecting chamber.

2. In machines used in cutting paper, cardboard or other fibrous mate-rials, embodying a suitable electric motor and a cutting element operated thereby, means for centrifugally arresting and collecting dust, fluff, and minute particles formed by the cutting element, as claimed in claim 1, wherein an enveloping air passage surrounds an air inlet of the cutting element casing for the purpose of suctionally arresting and collecting from the adjacentatmosphere any escaping minute particles of dust and/or fluiT.

3. In a paper cutting mechanism for association with high speed rotary web printing machines, a slotted casing, a rotary cutter projecting through the slotted casing; means for arresting and collecting dust and minute particles of fibrous materials formed by the cutting element including an outlet on the casing, an inlet on each side of the casing, fans on opposite sides of the cutter, an inner housing enclosing one of the fans, a nozzle on the inner housing located within said outlet, and an inlet in the inner housing.

4. An arrangement as. claimed inclaim 3, wherein the nozzle of the inner housing is located in the outlet of the outer casing for the purpose of setting up evaouative action and lowering the pressure within said casing.

5. An arrangement as claimed inclaim 3, wherein the nozzle on the inner housing is positioned to direct a jet of air on to the cutting edge of the rotary cutter.

6. An arrangement as claimed inclaim 3, wherein the fan in the inner housing draws dustcharged air into the housing and discharges the air through the nozzle to lower the pressure in the casing, and wherein the other fan sets up air turbulence and whirling of the dust particles in said casing.

7. In cutting and dust arresting means for high speed traveling web, comprising a roller over which the web is slit, web fluff moving at high speed, said roller being formed with a pcripheral channel, a cutter operating on the Web in line with the channel to slit the web, a dust arresting box having an entrant end conforming to the periphery of the roller and extending over and closely adjacent a material portion of said periphery substantially diametrically opposite the cutter and below the plane of the slit web, a clearing blade arranged in the box and having an operative end seated in said channel to clear from the latter the accumulated material incident to the severing of the web, a dust extracting and collecting chamber in open communication with the dust arresting box, and means for creating a suction in the dust arresting box and for withdrawing material from said box for collection in the dust extracting and collecting chamber.

8. In cutting and dust arresting means for high speed web traveling at a speed in excess of 750 linear feet per minute, comprising a roller over which the web is slit, web fluff moving at high speed, said roller being formed with a peripheral channel, a cutter operating on the web in line with the channel to slit the web, a dust arresting box having an entrant end conforming to the periphery of the roller and extending over a material portion of said periphery at a point substantially diametrically opposite the region of the cutter and below the plane of the slit web, a clearing blade adjustably arranged in the box and having an operative end seated in said channel to clear from the latter the accumulated material incident to the slitting of the web, a dust extracting and collecting chamber in open communication with the dust arresting box, and a fan for creating suction in the dust arresting box, and for withdrawing material from said box for collection in the dust extracting and collecting chamber.

THOMAS HAMILTON GROZIER.

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