Paper-Cutting Machines Part 9

GAGE MOVEMENT, AUTOMATIC s.p.a.cING DEVICE--This quickly moves the back gage and the pile forward a given distance without measuring for each cut, thus largely increasing production.

GREASE CUPS--Receptacles with a screw top containing lubricating grease, which is forced a little at a time upon the bearing when the screw top is turned, or which starts to melt and flow if the bearing warms.

GROOVED TABLE--Means slight rounded depressions lengthwise in the back table in which the back gage fingers travel, extending slightly below the table surface to catch the lowest sheets and prevent them from wedging under the back gage.

HAND CLAMPING WHEEL--Is generally connected to the clamp by a worm and gears (or directly by a screw). A force of one pound exerted on its rim holds the work with about one hundred and fifty pounds pressure and correspondingly more for each additional pound.

INDICATOR--Generally a steel ribbon ruled to sixteenths of an inch, reading the distance from the front face of the back gage to the cutting edge of the knife.

INTERLOCKING CLAMP AND BACK GAGE (also called fingered clamp and fingered back gage)--Recesses in the clamp permit projections on the back gage to push the work farther forward than if both clamp and back gage were solid and the clamp of sufficient width to hold the stock firmly.

JOG--To jog a pile against the gage is to strike it with a blow just sufficient to bring every sheet in the pile so that it touches the gage and in the same relative location with each other if all the margins are uniform.

KNIFE--A piece of tempered tool steel about one-half the width and thickness of the whole blade, forged into a piece of less expensive soft steel, in which holes can be drilled more easily for the bolts that hold it to the knife bar.

KNIFE ADJUSTMENT--Devices for lowering the knife-bar to compensate for the wear of the knife and for tilting it in case the knife edge is ground out of level.

KNIFE-BAR--A rigid carrier for the knife. The best style takes the down thrust and side thrust of the knife directly upon a solid shoulder planed in it, instead of the knife back ab.u.t.ting against the points of adjusting screws.

KNIFE-BAR MOTION--A mechanical way of imitating the action of a draw shave in pulling down the knife. The nearer it is to the hand method, the more simple and successful it is. Rods connected to each end of the knife-bar and pulled down by simple cranks at each end approach nearest to the method of human hands.

LIFT--The pile of paper or other stock cut and handled at one time.

MARKER--A part of the clamp on some machines, separate from the pressing part, that may be pulled down by a treadle to show where the knife is going to cut.

MOTOR BRACKET--A support attached to one side or top of the cutter to which the electric driving motor is firmly bolted.

OIL BOXES--Channels containing oily waste which allows the oil to seep slowly upon the bearing.

OIL CUPS--An oil feeding device requiring careful attention.

PLAIN CLAMP AND BACK GAGE--The under face of the clamp is a solid broad surface without any recesses; consequently the back gage has no projections but is simply a solid smooth front.

PILOT CLAMPING WHEEL--A wheel with handles projecting from the rim to give a firmer grasp.

POWER ATTACHMENTS--For hand-power cutters. These may be put only on machines designed and built originally for them.

SAFETY BOLT (LOCK STOP)--A steel bar which must be unlocked each time before the machine can make a cut.

SIDE GAGES--Flat guides bolted to each side of the table, front and back, accurately set at right angles to the knife and the table, against which the stock may be set to cut square.

SINGLE-SHEAR STROKE--The stroke of a knife which has a side-wise motion at the same time that it descends, with its edge always parallel with the table top. The single-shear cuts the entire width of each sheet at the same time all through the pile.

SOLID KNOCKER FOR THROW-OUT--This is a part solidly fastened to the shaft (or gear) making one revolution for each cut of the knife and that throws the clutch out positively and puts on the brake throwing in the safety bolt after every stroke of the knife.

s.p.a.cING DEVICES, AUTOMATIC--See "Gage Movement, Automatic s.p.a.cing Device."

STARTING BAR--A rod extending clear across the front of the larger size of the machines to start and stop the machines.

STARTING LEVERS--Preferably two, one at each side, on medium size machines, to start and stop the machines.

TABLE--A slab of metal upon which the stock is laid and handled for cutting.

TABLE, FRONT SIDE EXTENSIONS--Wings bolted on the front table upon which work may be handled before and after cut without having to turn around.

TOGGLING CRANK--A device on hand-lever cutters that increases the power as knife goes down and eliminates jumping on the lever to get the knife down through the lower part of the cut.

TREADLE, FOOT (for clamping)--A convenience which leaves the operator's two hands free to handle the work while locating the line of the cut by pulling down the clamp with foot treadle.

VERTICAL STROKE--An attachment for shear or double-shear stroke cutting machines which brings the knife down vertically, instead of side-ways.

It is used with knives of a special shape to cut irregular or fancy edges or to pink cloth samples. See Fig. 9, page 17.

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