US2949801A

US2949801A - Automatic wiper for rotary blade

Info

Publication number: US2949801A
Authority: US
Inventors: Emmett R Mills
Original assignee: Individual
Current assignee: Individual
Priority date: 1959-02-12
Filing date: 1959-02-12
Publication date: 1960-08-23
Anticipated expiration: 1977-08-23

Description

1960 E. R. MILLS AUTOMATIC WIPER FOR ROTARY BLADE Filed Feb. 12, 1959 INVENTOR. EMMETT R. MILLS ATTO RN EY United States Patent 2,949,801- AUTOMATIC WIPER FOR ROTARY BLADE Emmett R. Mills, Camas, Wash. Filed Feb. 12, 1959, Ser. No. 792,909 5 Claims. (Cl. 83-168) This invention relates to rotary cutters which require frequent grinding or sharpening while in use, and relates in particular to the so-called rotary saws which are employed in the paper mills for cutting long rolls of tissue into the customary toilet roll size.

In order to keep such cutters or roll tissue saws operating at maximum efliciency, and thus enabling them to make quick cuts through the tissue rolls in rapid succession, it is customary to give the cutting edges of the blades a momentary sharpening every few minutes. One way in which such sharpening is accomplished without loss of operating time on the part of the tissue saws is by means of pairs of grinding elements which are momentarily pressed against the opposite faces of the cutting edge respectively, such operation of the grinders taking place intermittently and preferably automatically. A grinding assembly of this type which has come into extensive use includes a pair of grinders operated automatically at regular intervals every few minutes by compressed air under electric controls. Oil is applied to both faces of the cutter to facilitate the cutting action.

A serious problem occasioned by such sharpening of the rotary cutters or tissue saws arises from the fact that with each grinding some grinding particles and some oil remain on the blades and this residue is then deposited on the cut edges of the first rolls encountered by the blades immediately following their sharpening. This frequently produces sufiicient soiling along the cuts to necessitate discarding some of the cut rolls.

An object of the present invention is to provide suitable means for wiping such grinding particles and oil from the cutter blade after each sharpening operation so as to prevent such residue from being deposited on the rolls which are cut.

A related object of the invention is to provide blade wiping means which will wipe both sides of the blade simultaneously.

A further object is to provide such blade wiping means which will operate entirely automatically and in proper synchronization with the blade sharpening means so as not to cause any operating time to be lost by the blade in the wiping of the blade.

The manner in which these objects are achieved with the blade wiper constituting the present invention, and the construction and method of operation of such blade wiper will be briefly explained and described with reference to the accompanying drawings, wherein:

Fig. 1 is a perspective View of the automatic wiper, showing the same mounted in operating position with respect to the rotating blade; and

Fig. 2 is a fragmentary elevation drawn to a larger scale and taken on the line indicated at 2-2 in Fig. 1, with some portions broken away and parts shown in section for the sake of clarity.

Referring first to Fig. 1, the rotary blade or tissue saw is secured on a shaft 11 which is driven by belt connection 12 with suitable driving means (not shown) causing the blade to rotate rapidly in the clockwise direction indicated by the arrow x. The blade shaft 11 is rotatably mounted in a support arm 13 which is swung rapidly up and down in an are by suitable means (not shown) so as to cause the blade to be raised aftereach roll-cutting operation and immediately lowered for the next roll-cutting operation in the usual manner.

The automatic grinders for the two faces of the rotating blade are omitted from the drawing for clarity, since such grinders are old and well known and form no part of the present invention. It is to be understood, however, that such grinders are operated in the usual manner compressed air from a suitable source.

The blade wiping assembly is mounted on a plate 14 which is pivotally supported from a stationary shaft 15, this shaft being parallel to the blade shaft 11. The blade shaft 11 carries a split bearing collar'16 with which one end of a rod 17 is connected. The other end of the rod 17 is adjustably attached to a bracket 18 on the plate 14, this rod being attached to the bracket by suitable means such as the clamping bolt and wing nut 19 shown. The plate 14 has a central slot 20 to provide a passageway for the edge of the blade 10. A bumper roll 25 is rotatably mounted on a support bracket 26 near the bottom of the plate 14. This bumper roll has a surface of rubber or other soft resilient material and its purpose is to serve as a safety stop for limiting the movement of the plate 14 with respect to the blade 10 to prevent any possible damage to the blade, and also to minimize the hazard when any maintenance work is being done on the wiper assembly.

' An electrically-operated,- one-way control valve assembly 21 is supported on the plate 14 and is connected with a suitable source (not shown) of air under pressure by a main air line 22. A branch air line 23 connects with the grinders, and the branch air lines 24 and 24' connect with air cylinders inthe wiper assembly to be described presently.

A pair of supply rolls 27 and 27' of blade-wiping material, such, for example, as soft paper or tissue, for the blade are rotatably supported on the plate 14 on opposite sides of the blade respectively and in the relative positions shown in Fig. 1. The supply of tissue 29 from the roll 27 is passed over a pair of

guide rolls

30, 30 and drawn between a draw roll 31 and a squeeze roll 33. Similarly the tissue 29' from the supply roll 27 is passed over the pair of

guide rollers

30, 30 and drawn between the draw roll 31 and squeeze roll 33, on the opposite side of the rotating blade. Spring-pressed

friction plates

28 and 28 bear against the

supply rolls

27 and 27 respectively to prevent the tissue from becoming loose on the supply rolls and to prevent inadvertent rotation of the supply rolls. The squeeze rolls 33 and 33', are rotatably mounted on shafts which in turn are supported by means (not shown) causing the squeeze rolls normally to bear against the respective'draw rolls but enabling the squeeze rolls to be moved a slight distance away from the draw rolls when the wiping material is being mounted in place.

A pair of air cylinders 34 and 34' are mounted on the plate 14, also on opposite sides of the blade respectively, as shown in Fig. 1. Each cylinder has a piston, the piston for the cylinder 34 being shown in Fig. 2 and designated by the reference character 36. A similar piston is carried in the cylinder 34 but it is not shown in the drawings. The pistons in the cylinders 34 and 34' have piston rods 35 and 35' respectively which extend towards the cutter blade and which carry pushers 38 and 38' respectively at their outer ends. These pushers bear against the wiping tissue 29 and 29' respectively in the space between the pairs of

guide rollers

30, 30 and 30', 30' respectively. Preferably the

pushers

38 and 38 are covered withsoft or resilient material, inasmuch as their lines 24; and-2,4? respectively, with the automatic opera:- assernbly 21, and the delivery.

t on of h valve ontrol of the air-into the cylinders forces the pistons, piston rods and pushersto move towards the respective faces of the blade and thuscausesv the wiping tissue to be brought into contact with the two-faces of the rotating blade. A spring engages the'piston in each cylinder, the spring 37 in cylinder 34f being shown in Fig. 2. A similar spring bears against the pistonin cylinder 34- but not shown. These; springs cause the pistons, piston rods and pushers to move i -opposite direction away from the blade, when the air pressure in the cylinders is reieve In order to provide clean sections of the wipingtissue for contact with the-blade faces each time the pushers 38 and 38' bring the wiping tissue into contact with the blade, the drawrolls 31 and 31' are driven slowly intermittently and, with the assistance of the

respective squeeze rolls

33 and 33, draw the strips of wiping tissue down from the respective supply rolls and over the ends of the pushers. For the purpose of operating these draw rolls each draw roll is attached to a ratchet wheel which is actuated by a pawl link connected with the piston rod of the respective cylinder. The collars 39 and 39 (Fig. 2,) are secured on the

piston rods

35 and 35 respectively and in turn carry. the pawl links 41 and 41'. The ratchet wheel 40' for the draw, roll 31f is shown in Fig. 2, and it will be apparent from this figure that each time the piston rod 35' moves from left to'right under the force of the spring 37' the ratchet wheel 40', and therewith the draw roll31', be caused to turn slightly in counter-clockwise direction. A similar ratchet wheel (not shown) attached to the draw roll 30 and actuated by the pawl link 41, moves the draw roll 30 correspondingly in clockwise direction.

The operation of the wiper assembly will now be apparent. Whenever the air supply valve is opened and air under pressure causes the grinders to operate, a supply of air will also be delivered to the cylinders 34 and 34' moving the piston rods and pushers towards the rotating blade 10 and causing the wiping tissue to be pressed against the faces of the blade. The pushers hold the tissue in contact with the blade for a short time after each grinding due to the control air valve which causes the air to be exhausted slowly from the cylinders after the cylinders have been actuated, thus holding the pushers and tissue against the blade long enough to clean the blade completely from any grinding residue.

Since the plate 14. is hingedly supported on the stationary shaft and is connected with the blade shaft and moving support for the blade by the rod 17, the plate 14 will oscillate slightly in a substantially horizontal direction with the up and down arcuate movement ofthe rotating blade. Thisadditional relative movement of the wipingassembly insures the wiping of thefaces of the blade completely, not only at the cutting edge but also over the adjacent area on which there may be any grinding particles or oil, and aids in providing the desired positive cleaning of the blade immediately after each grinding before the blade enters upon its next cutting operation. Also the mounting ofthe plate 14 and the entire wipingassembly on the stationary shaft 15 instead of on a shaft supported on the moving arm for the blade shaft causes only a minimum oscillating inertia load to be placed on the up and down movement of the rotating cutting blade. When access to the rotating blade isdesired the disconnecting of the rod 1'! enables the plate and entire. wiping assembly to belswung. up away from the blade.v Minor. modifications in the mechanism of the blade.wiping. .assemblyvwould.be possible without 4 departing from the principle of the invention, but that which is illustrated and described is considered'the preferred means for controlling the feeding of the wiping tissues and for bringing them intermittently into wiping contact with the two faces of the blade.

I claim:

1. In a wiping assembly for a driven rotating cutter blade, a pair of supplyrolls of blade-wiping material,

supporting means for-said supply. rolls on opposite sides of said blade respectively, guide means for guiding the blade-wipingmaterial from each of said supply rolls in paths along oppositesides of said blade respectively, means for moving the wiping material over said guide means, a pair of elementsengaging the wiping material on opposite sides of said blade respectively and intermittently thrusting said material into contact with the respective faces of said blade, and means for operating said elements.

2. In. a wipingassembly for a driven rotating cutter blade, a pair of supply rolls of blade-wiping material, supporting means for said supply rolls on opposite sides of "said blade respectively, guide rollers on said supporting means for guiding the blade-wiping material from each of said supply rolls in pvaths along opposite sides of said bladerespectively, means on said supporting means for moving the wiping rnaterial over said rollers, a pair of pushers engaging the wiping material on opposite sides. of said blade respectively and intermittently, thrusting saidmaterial intocontact with the respective faces of saidblade, andimeans on said supporting means for operating saidpushers.

3. In a wiping assembly'for a driven rotating cutter blade, a. mounting plate extending in a plane perpendicular tothe plane of said rotating blade, means for supporting said plate, said plate having a slot, a portion of said blade extendingthrough said slot, a pair of-supply rolls of blade-wiping material mounted-on said plate on opposite sides of said blade and said slot respectively,

operation of a one-way flow .ing plate extending in a guide rollersonsaid mounting plate for guiding the bladewiping material from each of said supply rolls in paths along opposite sides of said blade respectively, means including a pair ofdraw rolls on said mounting plate on opposite sides of said blade respectively, for moving the wiping material over said rollers, a pair of elements engaging the wiping material onopposite sides of said blade respectively and intermittently thrusting said material into contact with the respective faces of said'blade, and means, on saidplate for operating saidelements and for operating said draw rolls.

4. Ina wiping assembly for a driven rotating cutter blade of the character described'mounted on a shaft and oscillating in a fixed plane, a mounting plate extending in a plane perpendicular to the plane, of said rotating blade, said plate pivotally supported from a stationary shaft extending parallel to the shaft of said blade, said plate having a slot, a portion of said blade extending through said slot, positioning means connecting the free end of said plate with said blade shaft, a pair of supply rolls of blade-wiping material mounted on said plate on opposite sides of said blade respectively, guide means on said mounting plate for guiding the blade-wipingmaterial from each of said supply rolls in paths along opposite sides of said blade respectively, means for moving the wiping material over said guide means, a pair of pushers engaging the wiping material on opposite sides of said blade respectively and intermittently thrusting said material into contact with the respective faces of said blade, and means forv operating said pushers.

5 A Wiping assembly for a driven rotating cutter blade of the character described mountedon a shaft and oscillating in a fixed plane, said assembly including-amount,-

plane perpendicular to the plane of said rotating blade, said plate pivotallysupported from a; stationary shaft extending parallel to the-shaftof said @s id; Plate. aving with statist cs Qiaa d. b ade 6 extending through said slot, plate positioning means conmaterial on opposite sides of said blade respectively and necting the free end of said plate with said blade shaft, intermittently thrusting said material into contact with a pair of supply rolls of blade-wiping material mounted the respective faces of said blade, a pair of air cylinders on said plate on opposite sides of said blade respectively, and pistons supported on said plate on opposite sides of guide rollers on said mounting plate for guiding the 5 said blade respectively for operating said pushers, and blade-wiping material from each of said supply rolls in means connected with said cylinder pistons for operating paths along opposite sides of said blade respectively, said means for moving said wiping material over said means on said mounting plate on opposite sides of said guide rollers.

blade respectively for moving the wiping material over said guide rollers, a pair of pushers engaging the wiping 10 No references cited.