Abstract: A media alignment calibration system determines a slope relating a trailing edge skew value to its paired leading edge skew value and an intercept representing native skew based on a linear regression of a predetermined number of a set of paired leading and trailing edge skew values for a media type stored in a buffer. Based on the slope and intercept, a media model for the media type is updated based on the linear regression to adjust a differential velocity of a pair of aligned media feed rollers in a media feed mechanism to correct both a future native skew and future paired leading and trailing edge skew values in the buffer to within a desired operational window.

Abstract: A positional deviation correction pattern includes a first and second pattern image portions adjacent in a sub-scanning direction at the same position in a main-scanning direction, with the same width in the main-scanning direction. Each image portion includes a first side extending in the sub-scanning direction, a second side continuing from one end of the first side and extending in a direction intersecting the sub-scanning direction, and a third side continuing from the other end and extending in a direction intersecting both the sub-scanning direction and the second side. The second sides have the same inclination angle to a virtual line parallel to the main-scanning direction. The third sides have the same inclination angle to the virtual line. A length of one image portion in the sub-scanning direction gradually increases from one end to the other end in the main-scanning direction, a length of the other image portion gradually decreases.

Abstract: An optical beam scanning apparatus is disclosed, including: a laser source that emits an optical beam, a deflection part that deflects the optical beam, a light receiving part that receives a returning light of the optical beam which is deflected toward the laser source by the deflection part, a signal generation part that generates a synchronization detection signal, and an optical source drive part that conducts a lighting control of the laser source. The light receiving part is arranged in vicinity to the laser source. The signal generation part detects a timing at which the light receiving part receives the returning light, by an output signal from the light receiving part to generate the synchronization detection signal. The optical source drive part conducts the lighting control of the laser source in response to the synchronization detection signal as a reference.

Abstract: A method for repositioning a mark on a belt after an image on paper registration process, which includes printing a test pattern, measuring at least one test pattern parameter, detecting a mark on a belt and detecting at least one imaging error associated therewith, using the at least one test pattern parameter and the at least one imaging error to determine the lateral distance required to shift a particular image to a desired location on the belt and shifting the image to the desired location.

Abstract: A sub-scanning position of a laser beam is detected as an analog signal by a sub-scanning position detection sensor, and is then converted into a digital signal by an A/D converter. The signal is converted into a digital value (a detection result) having the same unit system as that of a count value for generating a vertical synchronization signal. This detection result and a set count value which is a count value for generating a vertical synchronization signal are added together by an adder. This added value is input to a vertical synchronization signal generation counter as a count value for generating an actual vertical synchronization signal. The set count value which is an initial set value is set from a control panel. Accordingly, a color-image forming apparatus which is capable of correcting a registration deviation in a sub-scanning direction is easily provided.

Abstract: In color printing with a color registration system for the registration of plural color images on an image bearing surface, such as a photoreceptor belt of a color printer, registration marks are imaged on the image bearing surface, which registration marks correspond to the color images and are sensed by a registration marks sensor. The system first automatically images first registration marks, preferably “Z” targets, which provide wider initial misregistration latitude for the sensor for gross registration. When an initial registration is achieved, the system automatically switches to imaging second registration marks, preferably chevron targets, providing higher registration accuracy for the sensor. These registration targets may be generated along opposite sides of the image area on opposite sides of the photoreceptor or other belt.

Abstract: A thimble (10) for the eye (4) of a rope (2) is provided with a sleeve (40) which receives the pin (32) of a shackle (30) and a bar (42) which attaches this sleeve to the inside wall of the thimble. The load in this beam is measured and recorded by means of a mechanical strain recording device (50) in which a scribe (56) on an arm (54) marks on a recording surface (52).

Abstract: Self-contained portable recording instrument is particularly useful at field sites for recording the magnitude of both welding current and operating duration. A second embodiment is adapted to record the magnitude of welding current, voltage and operating duration. Strip chart records provide analysts with means for determining operator incentive pay when working on field assignments. Records enable determining the quality and duration of actual welds, as well as the occurrence of operator-simulated welding time.