Abstract: During raising of a deck, a floor surface of the deck is irradiated, in a parallel-plane shape, with laser light serving as a planar beam from a prescribed height on one end side of the deck, and a laser-light-passing surface, which is a surface through which the planar beam passes, is produced. The laser-light-passing surface is imaged at an oblique angle from below a laser generator by an imaging device capable of capturing an image of light having the wavelength of the laser light. When an upward obstacle reaches the laser-light-passing surface, a reflected part of the planar beam appears in the image due to the upward obstacle, and the appearance of the reflected part with respect to a detection region that includes a position above the deck is monitored, whereby the approach of the upward obstacle toward the deck can be reliably detected.

Abstract: A valve gate of an injection valve includes a center pin whose end portion is exposed to a cavity, a valve main body accommodating the center pin, a valve tip surrounding an outer circumferential portion of the end portion of the center pin and fixed at an inner circumferential portion of the valve main body, a sleeve pin provided so as to be slidable along the center pin, a reservoir portion formed between the valve main body and the sleeve pin and accommodating a molten resin, and a heater surrounding the reservoir portion, wherein the sleeve pin is displaceable between a position where an opened state is established and a position where a closed state is established, and an end portion of the heater facing the cavity is positioned closer to the cavity than an end portion of the reservoir portion facing the cavity when the closed state is established.

Abstract: A valve gate of an injection valve includes a center pin whose end portion is exposed to a cavity, a valve main body accommodating the center pin, a valve tip surrounding an outer circumferential portion of the end portion of the center pin and fixed at an inner circumferential portion of the valve main body, a sleeve pin provided so as to be slidable along the center pin, a reservoir portion formed between the valve main body and the sleeve pin and accommodating a molten resin, and a heater surrounding the reservoir portion, wherein the sleeve pin is displaceable between a position where an opened state is-established and a position where a closed state is established, and an end portion of the heater facing the cavity is positioned closer to the cavity than an end portion of the reservoir portion facing the cavity when the closed state is established.