Abstract:
A method of drilling a through-hole for inter-surface conduction in a laminate for a printed wiring board, in which the heat generation in a drill bit can be inhibited in drilling holes, quality holes can be highly efficiently made in the presence, on the laminate surface, of a novel water-soluble lubricant sheet which has high strength and can be handled easily, the method comprising drilling the through-holes in the presence of a water-soluble lubricant sheet which has a thickness of 0.02 to 3 mm and is formed from a mixture of 20 to 90% by weight of a polyether ester with 10 to 80% by weight of a water-soluble lubricant.
Abstract:
The invention provides an entry board for use adjacent a printed circuit board during drilling therethrough comprising a drill lubricant distributed over the entry board. The board may comprise two or more separable laminar components (A, B) one of which has the drill lubricant. There is also provided a composite entry or backing board for use adjacent a printed circuit board during drilling therethrough, in which the adjacent faces of two laminar components of the entry or backing board are joined such that there is no relative slip during transportation, cutting and positioning, and they are separable by peeling them apart after use.
Abstract:
Rigid foam material, for example, expanded polystyrene foam, is drilled using a bit that forms an annular slit in the foam material and compresses the block temporarily around the slit. This frees the core for ready removal. The drill bit has a cutting ting at the leading end with an inside cutting edge and an annular bevel leading from the cutting edge to the outside surface of the cutting ring. The cutting ring is mounted on the leading end of a tube with an inside diameter greater than the inside diameter of the cutting ring in order to clear the core and an outside diameter less than the outside diameter of the cutting ring in order to clear the surrounding foam material.
Abstract:
A set of holes are drilled into a potato in preparation for cooking to provide a multi-holed potato and potato twirls. Apparatus for forming the multi-holed potato has a gang of parallel drills mounted for rotary and reciprocal movement through holes in a pair of plates spaced apart a distance to support the potato therebetween.
Abstract:
A drill for a paper drilling machine. The drill is made of two separate parts, namely a cutting bit of hollow generally cylindrical form having an annular cutting edge at one end, and a hollow cylindrical sleeve which receives the opposite end portion of the bit and which is itself received in a collet assembly of a drill spindle of the machine. The sleeve is radially compressible and is compressed by the collet assembly to frictionally grip the bit and permit transmission of drilling torque from the drill spindle to the bit in use.
Abstract:
An apparatus for punching a hole in a paper web, in particular for the production of liquid packs, has a movable punch which can be pressed against a counter-plate and which has a circular blade at its tip. In accordance with the invention, to permit the desired hole to be punched into the packaging material to the desired depth, using simple means, the punch has a rotationally driven cutter head. Due to the rotary movement of the punch or the blade-forming edge at the tip of the punch, the blade is no longer merely pressed into the paper web, as in previously known punching apparatuses, but in accordance with the invention it is rotated perpendicularly to the pressing movement, giving a cutting effect as when using a knife.
Abstract:
A method and tool for drilling holes in a composite of materials having different strength and elastic characteristics. The tool has a planar end surface inclined in two directions relative to the tool axes, and an axially-extending flute which define, with the periphery of the tool, a cutting single end point and adjacent cutting edges which are guided within the hole being formed by three axially-extending wearstrip segments of the tool periphery. The radius of the tool is gradually reduced from the final wearstrip to the side of the flute opposite the cutting single end point. The cutting end portion of the tool may be formed of a very hard carbide material. The method provides for simultaneous point and surface cutting of the composite. Point and surface cutting occur at the outer circumferential surface of the hole generally along a radius of the hole to be drilled. Cutting also occurs along a radius of the hole being generated.
Abstract:
An apparatus for drilling holes through batches of paper, the apparatus having a vertically movable drilling head, a movable table for supporting the batch of paper through which the holes are to be drilled at predetermined positions, and an indexing means incorporating elongate indexing members with holes or recesses provided therein corresponding to the positioning and spacing of the holes to be drilled, and a locating pin arrangement associated with and movable with the table and adapted for engagement in respective holes or recesses in a particular indexing member to set the table at the required positions for drilling operations. In one embodiment the locating pin arrangement is manually retracted and relocated, while in another embodiment the retraction and relocation is facilitated semi-automatically after each drilling operation.
Abstract:
Disclosed is a binding machine for binding papers such as chits, documents and the like by means of a binding cord which is formed simultaneously with the binding operation from a plastic tube, so that the troublesome work of preparing the binding cord and inserting it into the binding bore can be dispensed with. The binding machine has means for forming a binding bore through stacked papers to be bound, means for feeding the plastic tube as the material for the binding cord by a length corresponding to the height or thickness of the stacked paper, and adapted to sever the fed plastic tube during the upward movement of the drill after the boring, and means for inserting the severed plastic tube and heating the both ends of the severed plastic tube under application of a pressure to form these ends into respective flanges, thereby to complete the binding. These means are all installed unitarily to render the machine compact and easy to operate. A rapid and easy binding can be made, even by those who are not skilled in operation of the machine, ensuring a good appearance and durability of the bound papers, without substantially damaging the papers.
Abstract:
A method of cutting a patterned array of holes in a moving web of flexible material is provided including the steps of: Apparatus is provided for performing the above method.