US3670992A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reel brake device for tape recorder
Assignee: Canon Inc
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Filing: 1970-09-14
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Granted: 1972-06-20
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Expires: 1990-09-14
Abstract
Abstract A brake device used with tape recorders or the like of this invention includes a first brake member acting in the cut-in direction and a second brake member acting in the escape direction, the first and second brake members being disposed adjacent to braked members provided on the take-up and supply sides, respectively. Two brake members are selectively operable so that the selected brake member may act solely in the escape direction irrespective of the rotational direction of the braked members, whereby brake force can be exerted solely in the escape direction without erroneously breaking or severing a tape or the like running between the supply and take-up sides.
Inventors
- 👤 Takeshi Goshima
- 👤 Nobuhiro Imai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:02
CPC Classifications
B; B65; B65H; B65H23/00; B65H23/04; B65H23/06; G; G11; G11B; G11B15/00; G11B15/18; G11B15/22
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
128 words
A brake device applied to a reel for taking up a fine strip comprising a wheel to be braked, at least one brake shoe member to be press contacted with said wheel when the wheel is braked, at least one brake shoe retainer for retaining said brake shoe member, said retainer being shiftable in the tangential direction of the braked wheel at the contact point between said brake shoe member and said braked wheel when they are operated to be press contacted and thereby the brake shoe member substantially works as an escape direction brake shoe regardless of the rotational direction of the wheel; and brake operating means coupled to said retainer for shifting the retainer to press contact the brake shoe to the wheel to be braked.
Claim 2
Dependent Claim
128 words
A brake device applied to a reel for taking up a fine strip comprising a wheel to be braked, at least one brake shoe member to be press contacted with said wheel when the wheel is braked, at least one brake shoe retainer for retaining said brake shoe member, said retainer being shiftable in the tangential direction of the braked wheel at the contact point between said brake shoe member and said braked wheel when they are operated to be press contacted and thereby the brake shoe member substantially works as an escape direction brake shoe regardless of the rotational direction of the wheel; and brake operating means coupled to said retainer for shifting the retainer to press contact the brake shoe to the wheel to be braked.
Claim 3
Dependent Claim
138 words
A brake device according to claim 1, in which at least one pair of the retainers are provided for the wheel and each brake shoe is provided for each of the retainers, one brake shoe imparts a brake force to the wheel in the escape direction relative to the rotational direction while the other brake shoe imparts cut-in direction brake force, and said brake operating means has means to move the brake shoe retainer, which engages with the retainer, when the brake shoe brakes the wheel, so that the brake shoe retainer having braking force in the cut-in direction is moved to shift the brake shoe away from the wheel to substantially eliminate the braking force in the cut-in direction so as to brake the wheel by the brake shoe having the braking force in the escape direction.
Claim 4
Dependent Claim
63 words
A brake device according to claim 1, in which said brake shoe retainer has two pivots not becoming effective simultaneously, said pivots being convertible when the retainer shifts as the brake shoe on the retainer receives the frictional force from the braked wheel so that the brake shoe imparts brake force in the escape direction regardless of the rotational direction of the wheel.
Claim 5
Dependent Claim
59 words
A brake device according to claim 2, in which said brake shoe moving means comprises a cam portion formed on the brake shoe retainer and a guide member contacting with the cam portion, the cam portion having a cam to move the retainer having the brake shoe to brake the wheel in the cut-in direction away from the wheel.
Claim 6
Dependent Claim
41 words
A brake device according to claim 2, in which said brake operating means has an elastic member coupled with the brake shoe retainer and moved to the shoe mounted position to Give an elastic force for braking to the brake shoe.
Claim 7
Dependent Claim
60 words
A brake device according to claim 2, in which said brake shoe retainers are symmetrically arranged relative to the wheel, one end of the retainer is pivotably fixed and the other end of the retainer provides with the brake shoe opposed to the wheel and the middle of the retainer provides with a portion cooperative with said retainer moving means.
Claim 8
Dependent Claim
62 words
A brake device according to claim 1, in which said wheels to be braked are provided on rotating means for rotating the take up reel and supply reel, respectively, and brake shoes are moved in the tangential direction of the wheel due to the frictional force of the wheel so as to give the wheel the braking force in the escape direction.
Claim 9
Dependent Claim
151 words
A brake device according to claim 7, in which at least one pair of the brake shoe retainers is provided for each wheel to be braked, one brake shoe imparting a brake force to the wheel in the escape direction and the other brake shoe imparting a brake force to the wheel in the cut-in direction, and said brake operating means has means to move each of the brake shoe retainers, which engages with the retainer and the brake shoe imparting braking force in the cut-in direction is moved by receiving the frictional force of the wheel when the shoe brakes the wheel so as to move the brake shoe away from the wheel, so that the brake force of the brake shoe giving the braking force in the cut-in direction is eliminated and the brake force is given to the wheel only by the brake shoe giving the braking force.
Claim 10
Dependent Claim
85 words
A brake device according to claim 8, in which said retainer moving means comprises a cam portion formed on the brake shoe retainer and a guide member contacting with the cam portion, the cam portion being shaped in such a manner that, when the brake shoe to brake in the cut-in direction shifts by the frictional force of the wheel, the retainer is moved to the direction out of the tangential line of the brake shoe to move the brake shoe away from the wheel.
Claim 11
Dependent Claim
110 words
A brake device according to claim 8, in which said brake operating means has elastic members coupled with each of the brake shoe retainers, respectively, and the oppression force of the elastic member of the brake shoe retainer to brake the wheel of the supply reel is larger than that of the elastic member of the brake shoe retainer to brake the wheel of the take-up reel, so that the brake force imparted to the wheel of the supply side is larger than that imparted to the wheel of the take up side, and the fine strip is braked and stopped without slack between the supply and take up reels.
Claim 12
Dependent Claim
48 words
A brake device according to claim 10, in which said elastic members are coupled to each of the retainer symmetrically with the bisecting vertical line of the line connecting the rotational centers of the wheels, and the brake shoes are provided externally of each of the elastic members.
Claim 13
Dependent Claim
72 words
A brake device according to claim 7, in which said each brake shoe retainer is provided for each wheel, and said brake operating means has at least one elastic member corresponding to each retainer and the elastic member is symmetrically coupled to the brake shoe deviated position, and each brake shoe imparts different braking force in the escape direction to the wheel and the brake force for the supply side becomes larger.
Claim 14
Dependent Claim
88 words
A brake device according to claim 12, in which said brake shoe retainer has two pivots not becoming effective simultaneously, said pivots being convertible when the retainer shifts as the brake shoe on the retainer receives the frictional force from the braked wheel so that the brake shoe imparts brake force in the escape direction regardless of the rotational direction of the wheel and the brake force of the brake shoe at the supply reel becomes larger than that of the brake shoe at the take up reel.
References Cited (Backward Citations)
US2898055A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |