受験番号：30IPM015
問１
As depicted in fig. 7 and 8, a conventional squid-fishingapparatus includes: traction drums B installed on a hull A in
an affixed manner and parallel to the side of the vessel; aflip-up squid landing bay C extending from the positions ofinstallation of the traction drums B outward of the side of thevessel; guide rollers D (also referred to as tip rollers)
attached to the front edge of the squid landing bay C; and fishinglines F that include front ends with weights E attached theretoand extend from the traction drums B through the guide rollers
D into the sea, wherein the squid-fishing apparatus isconfigured to wind the fishing lines F by driving the traction
drums B by means of a drive roller in a manner such that squids
caught on fish hooks attached to the fishing lines F can be
dropped onto the squid landing bay C while the fish hooks arebeing moved from the guide rollers D toward the traction drums
B. Squids caught by such a squid-fishing apparatus naturally
drop onto the squid landing bay C owing to the weight thereofwhile the fish hooks are being moved from the guide rollers D
toward the traction drums B. Hence, much manpower is not
required for pulling up the squids so that fishermen can focus
onthetaskofmonitoringmachineoperations
andpost-processing for caught squids, thereby providing, among
other things, the advantage of performing tasks efficiently
with relatively small number of workers.
[0003]
Problems to be Solved by the Device
In the meantime, the traction drums of such a conventionalsquid-fishing apparatus are arranged along the side of the hull,and hence the number of traction drums that can be installedis dependent on the length of the side of the hull. Thus, thehull size has been a factor that inevitably limits the numberof squid-fishing apparatuses that can be installed. Such a
conventional squid-fishing apparatus can be typically provided

with only one or at most two traction drums per squid landing
bay. The traction drums of the conventional squid-fishingapparatus are installed on the deck. Accordingly, a worker inoperation could be caught in the rolling drum, and in some
reported cases, a weight attached to a fishing line being would
up jumps onto the vessel and hit and killed a worker. Thus,
the conventional squid-fishing apparatus involves a risk ofserious accident during operations.

問２[0014]
Numeral41
indicatesadrive-force/axial-force/motor-torque calculation unit. The
drive-force/axial-force/motor-torquecalculation
unit
determines an axial force, a drive force, and a motor torquefrom loads, shaft diameters, frictional coefficients, andpressure
anglesstoredina
load/shaft-diameter/frictional-coefficient storage unit 21andgearpositions
andgearsizes
storedinagear-position/gear-size storage unit 22.
The following
describes calculation principles by referring to fig. 2.
[0015]
In fig. 2, Gn indicates a gear currently focused on;
Gn-1, a gear on the drive side of the gear Gn; Gn+1, a gear on
the load side of the gear Gn. The gear Gn receives, from thegear Gn-1, a drive force (Tn-1) in a direction of a pressure
angle α with reference to a tangent and receives, from the gear
Gn+1, a reaction force (-Tn+1) applying a drive force (Tn+1)
in a direction of a pressure angle α with reference to a tangent.
[0016]The total of these two forces is transferred from thegear Gn to a shaft Sn as an axial force An. While the gear Gn
is rotating, the axial force An generates friction between thegear Gn and the shaft Sn, and the gear Gn receives a frictional
force Rn which corresponds to the product of the axial force
An and a frictional coefficient. Thus, driving the gear Gn
involves determining not only a torque for driving the load butalso a torque loss resulting from the frictional force, i.e.,
involves determining some values, including the product of theradius of the shaft and the frictional force. Accordingly, adrive force with a load and frictional loss considered isdetermined for each pair of a gear to which a load is appliedand a motor gear. In this way, the necessary motor torque iseventually determined.

問３
1.
A method of fabricating a floor for a trailer (1), themethod comprising:an inner-floor-unit formation step of forming an innerfloor unit (70) by installing, consecutively in a vehicle-width
direction, a plurality of floor components (30) extending ina vehicle-length direction and then welding the plurality offloor components (30);a temporary-floor-unit formation step of forming atemporary floor unit (71) by temporarily installing
floor-edge-portion components (37) on both sides of the innerfloor unit (70) that are located outward of the inner floor unit(70) in the width direction;a width adjustment step of disposing the temporary floor
unit (71) between a pair of guide walls (75) spaced apart fromeach other and affixing the floor-edge-portion components (37)to the guide walls (75) while adjusting the width of thetemporary floor unit (71); anda welding step of welding the inner floor unit (70) to
the floor-edge-portion components (37), wherein
width adjustment plates (50) having adjustment margins
in the width direction of the floor are provided at both edgesof the inner floor unit (70) in the width direction, and thefloor-edge-portion components (37) are provided with joint
plates (55) welded to the width adjustment plates (50), andthe temporary-floor-unit formation step includes
temporarily assembling the inner floor unit (70) and thefloor-edge-portion components (37) with the width adjustment
plates (50) and the joint plates (55) placed over each other.
「幅寸法」は「仮組床ユニット」のものと考えました。