US3821937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cooling of low-inertia motor driven direct drive sewing machine
Assignee: Singer Co
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Filing: 1972-12-18
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Granted: 1974-07-02
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Expires: 1992-12-18
Abstract
Abstract A direct drive sewing machine driven by a sealed low-inertia motor having a combination of elements adapted to provide for temperature control of the motor and certain operator accessible and auxiliary elements of the sewing machine. The motor is enclosed in end bonnets which are provided with cooling air entrance and exit openings. A blower external to the motor and operable independently thereof produces a continuous stream of cooling air regardless of the intermittent operation of the motor, which stream of air is directed through the entrance openings of the end bonnets and in close proximity to the motor shaft-bearing end plates of the motor within said end bonnets. The cooling air is then exhausted through the exit openings.
Inventors
- 👤 H Seesselberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:18
CPC Classifications
D; D05; D05B; D05B69/00; D05B69/10; D05B69/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
77 words
A method for cooling an enclosed, low-inertia, direct drive sewing machine motor, comprising producing a continuous stream of cooling air by means operable independently of said motor, directing said stream through entrance openings located respectively in end bonnets surrounding each of the motor end plates, causing the stream of cooling air in each end bonnet to flow in close proximity to the motor end plate therein and to exit through another opening in each said end bonnet.
Claim 2
Independent Claim
77 words
A method for cooling an enclosed, low-inertia, direct drive sewing machine motor, comprising producing a continuous stream of cooling air by means operable independently of said motor, directing said stream through entrance openings located respectively in end bonnets surrounding each of the motor end plates, causing the stream of cooling air in each end bonnet to flow in close proximity to the motor end plate therein and to exit through another opening in each said end bonnet.
Claim 3
Dependent Claim
39 words
A method according to claim 1, wherein said entrance and exit openings are so positioned as to permit said stream of cooling air to traverse the entire extent of said end plates before exiting from the respective end bonnets.
Claim 4
Dependent Claim
27 words
A method according to claim 2, wherein said stream of cooling air is directed through an arcuate entrance slot and is exited through an arcuate exit slot.
Claim 5
Dependent Claim
58 words
A method according to claim 1, wherein said stream of cooling air is introduced into a manifold chamber and is thence divided into two segments, one of said segments being directed through the entrance slot of one of said end bonnets and the other segment being directed through the entrance slot of the other of said end bonnets.
Claim 6
Dependent Claim
40 words
A method according to claim 4, wherein each said segment of cooling air is caused to pass through the end bonnet to which it is introduced in a path whereby motor-driven auxiliary sewing machine assemblies housed therein are cooled thereby.
Claim 7
Dependent Claim
141 words
In a direct drive sewing machine having means associated therewith for cooling the low-inertia driving motor, said motor being of the sealed type and mounted on the longitudinal arm of the machine such that the shaft of said motor is coupled operatively to the main machine drive shaft, and said motor being provided with a pair of opposed end plates in which said motor shaft is rotatably carried, the combination of an end bonnet enclosing each of said end plates and provided at diverse locations with cooling air entrance and exit openings, a blower external of said motor and operable independently thereof so as to supply a continuous stream of cooling air to each of said end bonnets regardless of intermittent operation of said motor, and cooling air distribution means connecting said blower with the entrance openings of said end bonnets.
Claim 8
Dependent Claim
141 words
In a direct drive sewing machine having means associated therewith for cooling the low-inertia driving motor, said motor being of the sealed type and mounted on the longitudinal arm of the machine such that the shaft of said motor is coupled operatively to the main machine drive shaft, and said motor being provided with a pair of opposed end plates in which said motor shaft is rotatably carried, the combination of an end bonnet enclosing each of said end plates and provided at diverse locations with cooling air entrance and exit openings, a blower external of said motor and operable independently thereof so as to supply a continuous stream of cooling air to each of said end bonnets regardless of intermittent operation of said motor, and cooling air distribution means connecting said blower with the entrance openings of said end bonnets.
Claim 9
Dependent Claim
25 words
A direct drive sewing machine according to claim 6, wherein said entrance and exit openings are positioned at substantially opposed locations in said end bonnets.
Claim 10
Dependent Claim
54 words
A direct drive sewing machine according to claim 6, wherein the entrance opening of each said end bonnet comprises an arcuate slot located adjacent the end plate enclosed by said end bonnet, the exit opening of each said end bonnet Comprising an arcuate slot located adjacent the diametrically opposed portion of said end plate.
Claim 11
Dependent Claim
64 words
A direct drive sewing machine according to claim 6, wherein said cooling air distribution means includes a junction box for said motor at one end to the lower sections of said end bonnets and communicating at said end with the entrance slots of said end bonnets, conduit means being connected at the other end of said junction box with the outlet of said blower.
Claim 12
Dependent Claim
104 words
A direct drive sewing machine according to claim 6, wherein the means for coupling said motor shaft to the main drive shaft of the machine and a braking mechanism for said motor shaft are housed in one of said end bonnets in a location whereby it is cooled by said cooling air stream, the bobbin winder of said machine being carried by said one end bonnet, and a needle position sensor assembly adapted to sense the vertical position of the sewing machine needle is housed within the other of said end bonnets in a location whereby it is cooled by said cooling air stream.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-01 | 1977-12-31 | 1978-07-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-01 | 1981-12-31 | 1982-07-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-01 | 1985-12-31 | 1986-07-02 | $7700.00 | Window Closed / Lapsed |