Abstract: In a process for the production of a lightweight cold urethane wherein raw materials are injected into a mold in one shot, diethanolamine is added in an amount of 0.1 to 2.0 parts by weight per 100 parts by weight of the polyol. When principal raw materials including a polyol and an isocyanate, and an auxiliary ingredient mixture prepared by previously mixing auxiliary ingredients other than the polyol and the isocyanate, are injected into a mold from separate storage vessels, a water-soluble silicone foam stabilizer is added to the auxiliary ingredient mixture.

Abstract: A non-contact profile control method capable of being effectively applied to a model whose contour has an irregularity such as a step-like contour. A non-contact distance sensor generates a dark alarm signal when its measuring beam spot is formed out of its detection area on a model. In response to this dark alarm signal, the profile control is discontinued, and a tracer head, on which the distance sensor is mounted, is rotated until the dark alarm signal is turned off so that the distance sensor can recover its detecting function. Furthermore, an additional rotation is given to the distance sensor by a predetermined amount to stabilize the detecting function of the distance sensor. A work table is shifted with respect to the tracer head so that a clearance between the tracer head and a steep slope of the stepped portion can be adjusted to become closer to a predetermined value, and the profile control is resumed.

Abstract: In a copy control device wherein a model (6) and a workpiece moved relatively with a tracer head (4) and a tool in an X-Y plane, measured distance values to the surface of the model, which are detected by first and second non-contact detectors (5a, 5b) obliquely mounted on the tracer head (4) rotatable about a Z axis are periodically sampled to obtain the coordinate values of measured points on the surface of the model, a normal vector (Nn) on the surface of the model is calculated from three coordinate values out of four measured points (P1n-1, P1n, P2n-1, P2n) successively obtained by the both detectors, and the tracer head is rotated so as to move along a projection (N1n) of the normal vector (Nn) on the X-Y plane, so that measuring axes of the detectors are controlled to be approximately vertical to the surface of the model.

Abstract: The purpose of the invention is to carry out the most appropriate attitude control of non-contact distance detectors (5a, b) onto the tracer model (6) surface and provide a digitizing control unit with high accuracy. A non-contact distance detecting device (105) samples coordinates of a plurality of points from the model surface, and the coordinates are stored in a memory (101). A point selecting device (102) selects 3 points on the tracer model surface composing a triangle most similar to a regular triangle after selecting 3 arbitrary points of the stored coordinates. A vector determining device (103) determines the normal vector with reference to the coordinates of the 3 selected points. The attitude of the non-contact distance detecting device (105) is controlled by the attitude control device (104) using the normal vector.

Abstract: When a non-contact tracing of a configuration of a three-dimensional model is carried out, the measurement axis of a tracer head is controlled to always be facing in an optimum direction with respect to a model surface by controlling the attitude of the tracer head, to thereby create tracing data of the configuration of the model. The tracer head is provided with two non-contact distance sensing units, and a normal vector of the model surface is determined based on a measurement value obtained by sampling tracing data supplied from the tracer head. At this time, the direction of a normal vector is determined from the outer product of surface vectors in a range in which the angle between an axial vector starting from a measurement point of the measurement axis of the tracer head and the normal vector at the measurement point does not exceed 90.degree.. The tracer head is controlled to be rotated in the direction toward a projection obtained by projecting the normal vector on a predetermined plane.

Abstract: A noncontact tracing control system for tracing machining a workpiece through a tracing of the contour of a model without contact. Coordinate values of a plurality of points on the model surface are acquired from measured values obtained by a plurality of times of sampling from two noncontact distance detectors (5a, 5b) provided at a tracer head of a tracing machine (3). A noncontact tracing control system (1) selects three points forming a triangle closest to an equilateral triangle, from among these points. A normal vector is acquired using the coordinate values of the vertices of these three points and outputs a command (SC) for rotating the tracer head (4) in the direction of a projection of this normal vector onto the X-Y plane. This command (SC) passes a D/A converter (17c), is amplified at an amplifier (18c), drives a motor (32c) and rotates the tracer head (4).

Abstract: A digitizing control device for generating tracing data related to a shape of a model while a tracer head carries out a non-contact tracing of the model shape. The rotation of the tracer head (4) is controlled in accordance with the inclination of a model surface (6), and distance detectors (5a, 5b) measure the distances therefrom to the model surface (6). When the inclination of the model surface (6) is smaller than a reference angle, the control of the rotation of the tracer head (4) is prohibited, to thereby achieve a stable distance measurement, and accordingly, accurate tracing data can be generated by a non-contact tracing of the model surface.

Abstract: A non-contact tracing control apparatus is disclosed which traces the surface of a model by using at least two optical distance detectors for detecting the distances therefrom to the model. When a first light corresponding to a first of the optical distance detectors is detecting a distance, a second light of another, second optical distance detector is either dimmed or shut off. Interference between more than one light reflected from the model and errors from, i.e., the first light reflected from the model incident on a second position sensor of the second optical distance detector can be avoided. The distances to a plurality of measurement points thus can be detected without interference even though the measurement points on the surface of the model are relatively close to one another.

Abstract: An electromagnetic feeder comprises a movable core secured to one mass of two masses connected by a resilient member, two fixed cores secured to the other mass so that said fixed cores are positioned on opposite sides of said movable core, two exciting coils wound about said two fixed cores, and a control circuit for alternately applying a phase-controlled current to said exciting coils, the mass to which said movable core is secured being connected to the object to be vibrated.

Abstract: This invention is a device for automatically adjusting the gap between a brake lining and a brake disk or drum. The gap can therefore be within the specified range for optimum braking performance, even when the brake linings become worn through extensive use.

Abstract: There is provided an image reproduction system whereby a moving picture and a still picture can be selectively reproduced from a tape-shaped recording medium having images recorded thereon in sequential frames and which also enables simple and automatic frame aligning.