A liquid circulation device includes a circulation passage, a liquid feeding device, a pressure sensor, and control circuitry. Through the circulation passage, liquid circulates to be supplied to and collected from a circulatory liquid discharge head. The liquid feeding device is configured to circulate the liquid through the circulation passage. The pressure sensor is configured to detect a pressure of the circulation passage. The control circuitry configured to acquire a characteristic indicating a relationship among a drive amount of the liquid feeding device, discharge information of the liquid discharged from the liquid discharge head, and a pressure detection value of the circulation passage; and change, based on the characteristic acquired, at least one of a control parameter and a calculation expression used to control the liquid feeding device.

A liquid discharge head includes: first and second common channels extending in a first direction; and individual channels including pressure chambers and nozzles. Each of the individual channels includes: a supply portion; a descender portion extending in a second direction; and a return portion extending in a third direction. The return portion includes: a throttle portion; and a wide portion. Each of the nozzles overlaps with the wide portion. A relationship of L2>L1 is satisfied, wherein L1 is a distance in the third direction from a center of each of the nozzles to a throttle starting position, and L2 is a distance in the third direction passing through a center in a cross section of the descender portion and ranging from a center line parallel to the second direction to the center of each of the nozzles.

A liquid discharging head includes a support member and plural print element substrates through which a liquid is discharged. The print element substrates are disposed on the support member and provided with the liquid through a liquid supply channel formed in the support member. The sectional area of the liquid supply channel at a position corresponding to each of the print element substrates is determined in accordance with an order in which the print element substrates are provided with the liquid.

A print-head module for a single-pass inkjet printer contains a housing component with a transverse bracket which extends in the X-direction and on which a number of print heads are arranged which are adjusted positionally with respect to at least one reference position. A load-bearing frame with a supporting device is provided for supporting the load-bearing frame. The housing component is mounted on the load-bearing frame such that it swings about a pendulum axis. Furthermore, a single-pass inkjet printer has at least one print-head module of this type. The inkjet printer contains a frame construction with a support, on which the at least one print-head module is placed by use of the supporting device.

The present invention relates to an ink-jet print heads protecting system in a digital printing machine, wherein the module comprises a chassis (1), rollers (2), and a plurality of digital printing units (10), each with a bridge (11) with guides (12) and a sliding carriage (13) with ink-jet print heads (14), one part of each guide overlapping the band and another part projecting beyond the band path, the carriage being movable between the printing and maintenance positions; and in that each bridge is attached to the chassis by a position adjustment device (20) and an articulation (25) that are spaced apart or by two position adjustment devices (20) that are spaced apart.

A liquid jetting apparatus includes: a first head chip having first nozzles arranged in a nozzle arrangement direction; a second head chip having second nozzles arranged in the nozzle arrangement direction, and being arranged to overlap at least partially with the first head chip in an orthogonal direction orthogonal to the nozzle arrangement direction; a controller configured to control the first head chip and the second head chip to jet liquid from the first nozzles and the second nozzles; and power sources having different voltages, respectively. Each of the first nozzles and the second nozzles is driven by voltage supplied from one of the power sources, and the first head chip has a first overlapping portion and the second head chip has a second overlapping portion overlapping with the first overlapping portion in the orthogonal direction.

An electronic assembly includes a substrate having a die and PCB mounted thereon. Wirebonds interconnect bond pads of the die with contact pads of the PCB, each wirebond having a first end portion bonded to a respective bond pad, an opposite second end portion bonded to a respective contact pad and an intermediate section extending between the first and second end portions. A dam encapsulant encapsulates each of the first and second end portions, a first fill encapsulant contacts the substrate and the dam encapsulant; and a second fill encapsulant overlies the first fill encapsulant. The first fill encapsulant has a lower modulus of elasticity than the second fill encapsulant and the dam encapsulant.

A droplet ejection apparatus includes, a droplet ejection head, wherein the droplet ejection head includes a nozzle communicated with a pressure chamber, a first piezoelectric element configured to pressure liquid in the pressure chamber so as to cause a droplet to be ejected, and a second piezoelectric element capable of pressuring the liquid in the pressure chamber, a first drive waveform generation unit configured to generate a first drive waveform to be applied to the first piezoelectric element, a second drive waveform generation unit configured to generate a second drive waveform to be applied to the second piezoelectric element, and a control unit configured to apply the second drive waveform to the second piezoelectric element after the first piezoelectric element is driven due to the applied first drive waveform. Residual vibration of the liquid in the pressure chamber is suppressed by a vibration caused by the second piezoelectric element.

A liquid discharge head includes a wiring portion; a print element board including an element for applying discharge energy to liquid; and an electric wiring board including a connecting portion connected to the wiring portion and electrically connecting the wiring portion and the print element board. The connecting portion is provided with a cut portion at a position between both end portions in a width direction of the connecting portion, and a length of the cut portion in the width direction is shorter than a length of the cut portion in a direction orthogonal to the width direction.

A printing system having: a print head arranged with a predetermined nip for printing to a recording medium; a sensor positioned upstream of the print head, and configured to detect possible joints of the recording medium; a spacer arranged in a region of the print head, the spacer being configured to be displaceable to deflect the recording medium and increasing a distance between the print head and recording medium; an actuator to displace the spacer element; and a controller configured to activate the actuator to displace the spacer upon detection of a joint by the sensor.