Abstract:
A heater for changing a projection distance protrusion value by thermal expansion accompanying electric-power-distributed heating is provided in a head having at least a reading element. At desired correction timing, a changed distance detection unit measures a clearance changed distance in a state in which the head is positioned to a track on the recording medium while increasing the amount of electric power distributed to the heater. A contact determination unit determines that the head is brought into contact with the recording medium when a derivative value of the clearance changed distance is below a predetermined threshold value. A measurement output unit outputs the clearance changed distance detected by the changed distance detection unit at the time of contact determination of the contact determination unit as a measurement result of the clearance between the reading element and the recording medium.
Abstract:
A shock detection device can detect a slight shock without mis-detection of shocks due to noise in a shock sensor signal. The shock detection device is adapted to output a shock detection signal for stopping writing into a disk medium when a shock applied to the disk medium satisfies a prescribed condition. The shock detection device includes a shock sensor that detects a shock applied to the disk medium and outputs a corresponding shock sensor signal, a variable shock detection slice value setting part that sets a threshold for the shock sensor signal based on a position error signal, a shock sensor signal correction part that outputs, as a new shock sensor signal, a signal by removing noise generated in synchronization with writing from the shock sensor signal, and a shock determining part that outputs a shock detection signal when the shock sensor signal exceeds the variable shock detection slice value.
Abstract:
One of the objects of the present invention is to offer novolak type phenolic resins which use phenols and aldehydes as raw materials and give narrow molecular weight distributions.The novolak type phenolic resins of the present invention are those obtained by condensation reaction of phenols with aldehydes in the presence of an oxycarboxylic acid having carboxyl groups, --COOH, and alcoholic hydroxyl groups, --OH, in one molecule. Thus, obtained novolak type phenolic resins show narrow molecular weight distributions, lower viscosity in molten state and, as a consequence, uniformity in curing time.
Abstract:
A veneer-pressing apparatus comprising a pressing device provided with at least three pressing bodies disposed movably from a non-pressing position where the pressing bodies are vertically spaced apart from each other to a pressing position where the pressing bodies are close to each other; endless belts each adapted to be intermittently moved in a direction opposite to that of the neighboring endless belt, thereby forming a forward transfer passage between a pair of facing surfaces of the neighboring endless belts and a backward transfer passage which is opposite in transferring direction to the forward transfer passage; and a pressing member which is capable of rendering the pressing bodies provided with the endless belt to move from a non-pressing position to a pressing position to press a veneer with a predetermined pressure. This apparatus further comprises a first transfer means disposed on an upstream side of the forward transfer passage in the pressing device, a transferring direction thereof being the same as the forward transfer passage; and a second transfer means disposed on an upstream side of the backward transfer passage in the pressing device and capable of being moved in both forward and backward directions as well as in vertical direction.
Abstract:
Servo information is written on a magnetic disk at intervals equivalent to 1/N of where the period at the position of a head is controlled. When the frequency characteristic of a servo loop is measured, a servo controller generates a position signal, which indicates deviation of the head from a reference position, using servo information at a first sampling point, calculates an actuator drive current command value, which drives an actuator, on the basis of the position signal, and controls the actuator based upon the current command value. Further, the servo controller executes processing for generating the position signal, but does not calculate the actuator drive current command value, on the basis of servo information at second through Nth sampling points. A frequency characteristic analyzer inserts a disturbance signal having a predetermined frequency into the servo loop, accepts, at double the sampling frequency, the position signal and the actuator drive current generated based upon each item of servo information, obtains the frequency characteristic of the servo loop and outputs the frequency characteristic.
Abstract:
A belt conveyor is provided to feed veneers in the arrow-marked direction in the drawing. A porous transfer belt having numerous of air holes therein is stretched around so as to run above said belt conveyor. Inside the porous transfer belt, a suction hood which has a plurality of small air passages formed in the running direction of the porous conveyor belt is installed to rotatably accommodate a damper further therewithin. The damper makes intermittent rotations to open or close the sucking section such that only a desired veneer is selectively sucked for sort-out transfer with the result that the need for piercing the veneer or defining in advance a gap between each adjacent two veneers is eliminated. Therefore, it is now possible to perform high speed sort-out operations without subjecting the veneer to damage or breakage resulting from tensile strength exerted thereon at the time of defining the gap.
Abstract:
A photopolymerizable composition comprising: (a) a compound obtained by reacting one mole of a polyamine represented by the following general formula (I) with at least 2 moles of a compound having a group capable of reacting with the polyamine and a polymerizable ethylenically unsaturated group: ##STR1## wherein n is an integer of not less than 1 and (b) a photopolymerization initiator.A dry PS plate comprises a substrate provided thereon with, in order, a light-sensitive resin layer and a silicone rubber layer wherein the light-sensitive resin layer comprises the photopolymerizable composition and a polymeric compound having film-forming ability.The photopolymerizable composition and the dry PS plate have very high sensitivity.
Abstract:
A light-sensitive composition is herein disclosed, which comprises at least one light-sensitive s-triazine compound represented by the following general formula (I) and at least one compound having at least one ethylenically unsaturated double bond and capable of causing addition polymerization: ##STR1## wherein R.sub.1 and R.sub.2 independently represent hdyrogen atom, a substituted or unsubstituted alkyl or aryl group, or a group represented by the general formula: R.sub.5 --CO-- or N(R.sub.6) (R.sub.7)--CO-- (wherein R.sub.5 stands for a substituted or unsubstituted alkyl or aryl group; and R.sub.6 and R.sub.7 independently represent hydrogen atom or a substituted or unsubstituted alkyl or aryl group), provided that R.sub.1 and R.sub.2 may form a heterocyclic ring consisting of non-metallic atoms together with the nitrogen atom to which they are bonded; R.sub.3 and R.sub.4 represent hydrogen, a halogen, an alkyl or an alkoxyl; X and Y independently represent chlorine or bromine; and m and n are 0, 1 or 2. The light-sensitive composition has high sensitivity even after storing at a high temperature and effectively used for producing light-sensitive plates for making lithographic printing plates; proof plates for printing; films for overhead projector, intermediate print and photomasks; and photoresists.
Abstract:
There is provided a water treatment method using a water treatment flocculant that suffers from minimal secondary contamination with flocculation residues and contains an alkaline solution of a phenolic resin. A water treatment method involving the addition of a flocculant to water to be treated and subsequent membrane separation treatment. The flocculant contains an alkaline solution of a phenolic resin having a melting point in the range of 130° C. to 220° C. The water treatment flocculant is produced by a resole-type second-order reaction in the presence of an alkaline catalyst in which an aldehyde is added to an alkali solution of a novolak phenolic resin. The novolak phenolic resin is produced by a reaction between a phenol and an aldehyde in the presence of an acid catalyst.
Abstract:
There is provided a water treatment method using a water treatment flocculant that suffers from minimal secondary contamination with flocculation residues and contains an alkaline solution of a phenolic resin. A water treatment method involving the addition of a flocculant to water to be treated and subsequent membrane separation treatment. The flocculant contains an alkaline solution of a phenolic resin having a melting point in the range of 130° C. to 220° C. The water treatment flocculant is produced by a resole-type second-order reaction in the presence of an alkaline catalyst in which an aldehyde is added to an alkali solution of a novolak phenolic resin. The novolak phenolic resin is produced by a reaction between a phenol and an aldehyde in the presence of an acid catalyst.