# US 10,117,424 B2 · Spool brake device for dual-bearing reel > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,117,424 B2 - Document ID: US10117424B2 - Status: Granted - Kind: B2 - Application number: 15/265,537 - Filed: 2016-09-14 - Published: 2017-06-22 - Granted: 2018-11-06 - Earliest claimed: 2015-12-18 - Assignees: Shimano Inc. - Applicants: Shimano Inc. - Inventors: Takashi Komemushi; Yuichiro Ishikawa; Akira Niitsuma - Web page: https://patentgrep.com/patent/US10117424B2 ## CPC - A01K 89/01557: {Centrifugal} - A01K 89/01555: {using magnets} - G01P 3/44: for measuring angular speed (G01P3/56 takes precedence) - G01P 3/486: delivered by photo-electric detectors - G01P 3/487: delivered by rotating magnets - G01P 15/165: {for measuring angular accelerations} - A01K: ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS - G01P: MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT (measuring or recording blood flow A61B5/02, A61B8/06; monitoring speed or deceleration of electrically-propelled vehicles B60L3/00; vehicle lighting systems adapted to indicate speed B60Q1/54; determining position or course in navigation, measuring ground distance in geodesy or surveying G01C; combined measuring devices for measuring two or more variables of movement G01C23/00; measuring velocity of sound G01H; measuring velocity of light G01J7/00; measuring direction or velocity of solid objects by reception or emission of radiowaves or other waves and based on propagation effects, e.g. Doppler effect, propagation time, direction of propagation, G01S; measuring speed of nuclear radiation G01T; measuring acceleration of gravity G01V; {measuring or recording the speed of trains B61L23/00; speed indicators incorporated in motor vehicles B60K35/00; measuring frequency or phase G01R; traffic control G08G}) ## Abstract A spool brake device for a fishing reel includes an electric spool brake, a rotation detector, and a controller. The rotation detector detects a rotation of the spool. The controller calculates a rotational velocity of the spool based on the rotation of the spool, determines whether the fishing reel is in a casting state based on the rotational velocity, controls the spool brake to brake the spool upon a determination that the fishing reel is in the casting state, and controls the spool brake to not brake the spool upon a determination that the fishing reel is not in the casting state. ## Claims ### Claim 1 A spool brake device for a fishing reel, the spool brake device configured to brake a spool of the fishing reel, the spool brake device comprising: a spool brake configured to brake the spool in an electrically controllable manner; a rotation detector configured to detect a rotation of the spool; and a controller configured to calculate a rotational velocity of the spool based on the rotation of the spool, to determine whether the fishing reel is in a casting state based on the rotational velocity, to control the spool brake to brake the spool upon a determination that the fishing reel is in the casting state, and to control the spool brake to not brake the spool upon a determination that the fishing reel is not in the casting state. ### Claim 2 (depends on 1) The spool brake device according to claim 1, wherein the rotation detector includes a sensor, the sensor configured to output a signal to the controller upon detecting a detection target provided on the spool. ### Claim 3 (depends on 2) The spool brake device according to claim 2, wherein the spool brake includes a brake magnet and a plurality of coils, the brake magnet rotatable unitarily with the spool, the brake magnet having a plurality of magnetic poles aligned in a circumferential direction, the plurality of coils disposed away from an outer periphery of the brake magnet at intervals, the detection target is the brake magnet, and the sensor is a magnetic sensor configured to be turned on and off by rotation of the brake magnet. ### Claim 4 (depends on 2) The spool brake device for a fishing reel according claim 2, wherein the detection target is a light reflective member on the spool, and the sensor is a photosensor configured to irradiate a light to the spool and be turned on by the light reflected by the light reflective member. ### Claim 5 (depends on 1) The spool brake device according to claim 1, wherein the controller is further configured to calculate a rotational acceleration of the spool based on the rotation of the spool, and to determine that the fishing reel is in the casting state upon a determination that the rotational acceleration is greater than a first rotational acceleration. ### Claim 6 (depends on 5) The spool brake device according to claim 5, wherein the controller is further configured to set a predicted start time and start a braking control for the spool brake to start braking the spool at a braking start time, the braking start time determined based on the predicted start time, the predicted start time set based on a point of time at which the rotational acceleration becomes less than or equal to a second rotational acceleration, the second rotational acceleration greater than the first rotational acceleration, the braking start time being after a time the rotational acceleration has reached a maximum rotational acceleration. ### Claim 7 (depends on 6) The spool brake device according to claim 6, wherein the controller is further configured to set a braking duration, the braking duration lasting from the braking start time until the braking control is finished, and to determine that the fishing reel is not in the casting state upon a determination that the rotation of the spool has occurred after the braking duration has elapsed. ### Claim 8 (depends on 1) The spool brake device according to claim 1, wherein the controller is further configured to calculate the rotational velocity of the spool based on the rotation of the spool detected by the rotation detector, and to determine that the fishing reel is in the casting state upon a determination that the rotational velocity is greater than a first rotational velocity. ### Claim 9 A method for controlling a spool brake device of a fishing reel, the method comprising: calculating a rotational velocity of a spool; determining whether the fishing reel is in a casting state based on the rotational velocity; controlling the spool brake to brake the spool upon a determination that the fishing reel is in the casting state; and controlling the spool brake to not brake the spool upon a determination that the fishing reel is not in the casting state. ### Claim 10 (depends on 9) The method according to claim 9, further comprising: calculating a rotational acceleration of the spool; and determining that the fishing reel is in the casting state upon a determination that the rotational acceleration is greater than a first rotational acceleration. ### Claim 11 (depends on 10) The method according to claim 10, further comprising: setting a predicted start time; and controlling the spool brake to start braking the spool at a braking start time, the braking start time determined based on the predicted start time, the predicted start time set based on a point of time at which the rotational acceleration becomes less than or equal to a second rotational acceleration, the second rotational acceleration greater than the first rotational acceleration, the braking start time being after a time the rotational acceleration has reached a maximum rotational acceleration. ### Claim 12 (depends on 11) The method according to claim 11, further comprising: setting a braking duration, the braking duration lasting from the braking start time until the braking control is finished; and determining that the fishing reel is not in the casting state upon a detection that a rotation of the spool has occurred after the braking duration has elapsed. ### Claim 13 (depends on 9) The method according to claim 9, further comprising: determining that the fishing reel is in the casting state upon a determination that the rotational velocity of the spool is greater than a first rotational velocity. ### Claim 14 (depends on 13) The method according to claim 13, further comprising: starting a timer upon starting a braking and determining that the rotational velocity of the spool is less than or equal to a second rotational velocity. ### Claim 15 (depends on 14) The method according to claim 14, further comprising: ending the braking upon turning the timer off after a braking duration has elapsed and the rotational velocity of the spool is less than or equal to a third rotational velocity. ### Claim 16 A spool brake device for a fishing reel, the spool brake device to brake a spool of the fishing reel, the spool brake device comprising: an electric spool brake; rotation detecting means for detecting a rotation of the spool; and spool brake controlling means for calculating a rotational velocity based on a signal from the rotation detecting means, for determining whether the fishing reel is in a casting state based on the rotational velocity, for controlling the spool brake to brake the spool upon a determination that the fishing reel is in the casting state, and for controlling the spool brake to not brake the spool upon a determination that the fishing reel is not in the casting state. ### Claim 17 (depends on 16) The spool brake device of claim 16, wherein the spool brake controlling means calculates a rotational acceleration based on the signal from the rotation detecting means, and determines whether the fishing reel is in the casting state based on the rotational acceleration. ### Claim 18 (depends on 16) The spool brake device of claim 16, wherein the spool brake controlling means sets a braking duration based on the rotational velocity, and controls the spool brake to brake the spool based on the braking duration. ### Claim 19 (depends on 16) The spool brake device of claim 16, wherein the spool brake controlling means calculates a tension based on the rotational velocity, and changes a braking force according to the tension. ### Claim 20 (depends on 16) The spool brake device of claim 16, further comprising: selection detecting means for detecting a selection, wherein the controlling means further controls the spool brake based on the selection.