# US 4,394,994 A · Tape fast-forwarding and rewinding apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 4,394,994 A - Document ID: US4394994A - Status: Granted - Kind: A - Application number: 06/275,282 - Filed: 1981-06-19 - Granted: 1983-07-26 - Earliest claimed: 1980-06-20 - Assignees: Victor Company of Japan, Ltd. - Inventors: Hirotoshi Oono - Web page: https://patentgrep.com/patent/US4394994A ## CPC - G11B 15/442: {Control thereof} - G11B 15/48: Starting; Accelerating; Decelerating; Arrangements preventing malfunction during drive change - G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R) ## Abstract A tape fast-forwarding and rewinding apparatus comprising a rotation driving circuit for driving a motor for rotating a take up or supply reel so that the tape travels at a first fast-forwarding or rewinding speed, or travels at a second fast-forwarding or rewinding speed, the latter speed being faster than the former, a detection circuit for detecting the radii of wound tape respectively on the take-up and supply reels, and a memorizing circuit for memorizing the ratio of the radii of the wound tape detected by the detection circuit, while the tape is travelling at the first fast-forwarding or rewinding speed. A controlling circuit serves for controlling the rotation driving circuit so that the tape travels at the second fast-forwarding or rewinding speed after travelling at the first fast-forwarding and rewinding speed, and for controlling the rotation driving circuit so that the speed of the tape changes to the first fast-forwarding or rewinding speed from the second fast-forwarding or rewinding speed when the aforesaid value of the reciprocal of the radii ratio, when the tape is travelling at the second fast-forwarding or rewinding speed, is equal to the value of the ratio memorized in the memorizing circuit. ## Claims ### Claim 1 A tape fast-forwarding and rewinding apparatus comprising: rotating means for rotating a tape take-up side reel in a direction so as to take up a tape upon tape fast-forwarding mode, and for rotating a tape supply side reel in a direction so as to take up the tape upon tape rewinding mode; rotation driving means for driving said rotating means so that the tape which is taken up by said tape take-up side reel or said tape supply side reel travels at a first fast-forwarding or rewinding speed, and so that the tape travels at a second fast-forwarding or rewinding speed which is a high speed faster than said first fast-forwarding or rewinding speed; detection means for substantially detecting the radii of tape rolls of wound tape which are wound around both the take-up side and the supply side reel rotated by said rotating means. memorizing means for memorizing a ratio between the radii of the tape rolls of wound tape which are substantially wound around both the reels obtained by said detection means, when said tape is travelling at said first fast-forwarding or rewinding speed; and controlling means for controlling said rotation driving means so that said tape travels at said second fast-forwarding or rewinding speed after travelling at said first fast-forwarding and rewinding speed, and controlling said rotation driving means so that the speed of said tape becomes said first fast-forwarding or rewinding speed from said second fast-forwarding or rewinding speed when a value which is a reciprocal of the ratio between the radii of the tape rolls of wound tape which are substantially wound around both the reels obtained by said detection means when said tape is travelling at said second fast-forwarding or rewinding speed, is equal to the value of the ratio memorized in said memorizing means, as a result of comparison performed. ### Claim 2 (depends on 1) A tape fast-forwarding and rewinding apparatus as claimed in claim 1 in which said rotating and driving means has means for applying a first voltage corresponding to said first fast forwarding or rewinding speed and a second voltage which is larger than said first voltage and corresponding to said second fast-forwarding or rewinding speed, to said rotating means. ### Claim 3 (depends on 2) A tape fast-forwarding and rewinding apparatus as claimed in claim 2 in which said controlling means comprises: applying voltage changeover means for applying said first voltage to said rotating means in response to the starting of the tape fast-forwarding or rewinding operation, and changing over to apply said second voltage to said rotating means after a predetermined time has elapsed from when said first voltage was applied; comparing means for comparing the value of the ratio memorized in said memorizing means and a reciprocal value of the ratio which is detected when said tape is travelling at said second fast-forwarding or rewinding speed; and means for changing over said applying voltage changeover means in response to an output of said comparing means when the compared values of the ratios are equal to each other, so that the voltage applied to said rotating means is changed over from said second voltage to said first voltage. ### Claim 4 (depends on 1) A tape fast-forwarding and rewinding apparatus as claimed in claim 1 in which said controlling means controls said rotation driving means so that said tape travels only at said first fast-forwarding or rewinding speed in a case where said detection means detects that the radius of the tape roll on the tape take-up side reel is larger than the radius of the tape roll on the tape supply side reel and the apparatus is in a tape fast-forwarding mode, or in a case where said detection means detects that the radius of the tape roll on the tape supply side reel is larger than the radius of the tape roll on the take-up side reel and the apparatus is in a tape rewinding mode. ### Claim 5 (depends on 1) A tape fast-forwarding and rewinding apparatus as claimed in claim 1 in which said detection means is means for detecting respective rotational periods or rotational speeds of both said reels. ### Claim 6 (depends on 1) A tape fast-forwarding and rewinding apparatus as claimed in claim 1 in which said second fast-forwarding or rewinding speed is selected at a speed which is approximately two to four times said first fast-forwarding or rewinding speed.