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The Twisted-Shaft Needle Rocker: A Straight Push That Swings the Needle, Then Holds It Still
A sewing machine's curved needle or looper must swing through its arc at the right moment, then stand still while the other needle passes, and a crank or cam that does this is noisy and wears.
W. O. Grover of Boston received US 21,670, dated 5 October 1858, for "actuating a curved needle, looper, or hooker-on having an interrupted vibratory motion by means of the combination of an irregular-shaped spiral shaft with a reciprocating driver". The needle's shaft is flat at its top and bottom and cut between them like an American auger or gimlet; a driver moving up and down carries pieces of watch or clock spring that bear on the shaft, so it turns while the springs pass the screw and rests while they lie on the flats. Layers of rawhide or leather between the springs quiet the rattle and hold oil.
This rung works out the swing and the pause, then twists a flat bar with straight ends, mounts it with a sliding driver, and counts the swing and the rest.
高级
About 6 hours
说明
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Swing and pause
Swing and pause
正在加载 Jupyter 笔记本…
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A vibrating needle before it
A vibrating needle before it
The embedded blueprint rocks its needle on a shaft turned by a crank. Grover rocks his curved needle with a twisted shaft and a sliding driver, which gives it rests between swings.
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Read US 21,670
Read US 21,670
"This shaft d, at or near the center of its length, is formed either somewhat like the American auger, as shown in Figs. 3 and 4, or like an American gimlet, as shown in Figs. 1 and 2, being either a single or double threaded screw, while the thread or threads, as the case may be, terminate or gradually run into flat surfaces whose planes are parallel, or nearly so, to the axis of the shafts."
"Now, it will be clear to any mechanic that the shaft may be vibrated through any required arc by a proper number of turns or parts of a turn of a screw-thread, and that its velocity of vibration will depend upon the pitch of the thread and the speed of the driver, and that the time and period of its rests depend upon the location of the flat pieces and their length as compared with the velocity of the driver."
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Build the rocker and time it
Build the rocker and time it
**Shaft.** Cut 25 cm of 20 × 3 mm mild steel flat bar. Heat its middle 3 cm red and, with the lower end in the vise, give it a quarter turn with an adjustable wrench, leaving the ends flat and parallel to each other, now at right angles.
**Frame.** Mount the shaft between two hardwood blocks on a board with a hole in each for a round pin silver-soldered to its ends, so it turns freely. Fix a short arm with a pointer to its top as the needle.
**Driver.** Cut a hardwood block that slides along a guide beside the shaft, with a slot the flat bar passes through. Line the slot's faces with two strips of spring steel, with a strip of leather behind each, so they bear on the bar's faces.
**Test.** Push the driver slowly from one end to the other. Mark the pointer's angle every 5 mm of stroke, and see where it turns and where it rests.
此步骤所需材料：
低碳钢扁钢0.3 米
低碳钢圆棒0.05 米
银焊料套装（低温/中温/高温）1 个
熔剂1 个
硬木板1 个
硬木块3 个
木螺钉10 个
弹簧钢带0.1 米
皮革1 个所需工具：
钢锯
丙烷喷灯
台虎钳
活动扳手
锉刀（手用锉）
手锯
木工凿子套装
充电式电钻
钻头套装
螺丝刀套装
量角器
直尺
耐热手套
透明安全眼镜5
5
A rocker that jams, slips or never rests
A rocker that jams, slips or never rests
Twisted-shaft needle rocker troubleshooting.
Flow
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History and honest limits
History and honest limits
**W. O. Grover** of Boston, Massachusetts, received US 21,670, dated 5 October 1858; he signed on 21 December 1857. His machine made the Grover & Baker stitch with two threads and a crooked needle c′ on the shaft d, driven by the reciprocating driver g on a centre; he also meant the mechanism for hookers-on and loopers. With a double-threaded shaft the springs s s embraced it and rested in slots in the driver, which he found best. His claims cover the curved needle or looper with the spiral shaft and driver, the springs, the rawhide or leather layers, and the actuating surface that embraces the shaft yet slides.
**Honest limits.** A hand-twisted flat bar and a hand-pushed wooden driver stand in for his machine's shaft and driver. The notebook treats the twist as a uniform screw; its leads and lengths are examples. Your marked angles are the result.
材料
9- 0.3 米占位符
- 0.05 米占位符
- 占位符
- 1 个占位符
- 1 个占位符
- 3 个占位符
- 10 个占位符
- 0.1 米占位符
- 1 个占位符
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