Furthermore, the rotation of the upper shaft is transmitted to the lower shafts through the belt cam and crank. Rotation of the lower shaft leads to the following two functions: the first one is the rotating movement of the small metal tank, "bobbin case" twice the speed of the upper shaft , and following is the gear feeding of the fabric vertical and horizontal movement.
A sewing machine is a machine that converts a motor rotation into four these types of movements. Through this process strong needles are produced. Unlike hand sewing needles, the hole near the tip has been drilled. The upper thread passes through the needle here and sews the fabric. However, when the needle is pulled out of the fabric and return to the front of the fabric, the upper thread makes a loop in the back side of the fabric because of the frictional force of the upper thread and the fabric.
At this time, due to the rotation of the small metal tank bobbin case , the lower thread passes through the upper lower thread in loop state Figure 2. This is how strong stitches are made. The repetition of this work is sewing. Machines are set for a very precise tension setting.
If they are set for a lighter plastic bobbin, the tension will change if a heavier metal bobbin is used. All top loading Janome sewing machines use the same clear plastic bobbins for proper stitching.
Metal bobbins interfere with the magnetic hook system. Good quality thread is also a must! Skip to content Common questions. January 30, Joe Ford. Table of Contents. Abstract: A sewing bobbin assembly and method that provides access of a sewing machine, and particularly a bobbin in the sewing machine, to a larger supply of thread with automatic reloading of the bobbin during use thereof. Filed: March 18, Publication date: September 20, Inventor: Geoff McCue.
Sewing thread spool having thread locking and cutting functions. Abstract: A sewing thread spool having thread locking and cutting functions is disclosed.
The sewing thread spool comprises a winding core having an outer rim at one end and a bobbin at one end of the core, with a thread cutting plate arranged on an end plane of the bobbin. The bobbin comprises a thread-passing notch arranged at the end with the thread cutting plate. The thread cutting plate comprises a first and a second bayonet sockets separated from each other, the first bayonet socket cooperating with the thread-passing notch to produce a tension in a thread, and the second bayonet socket being used for cutting the thread and fixing the thread end.
The thread spool is beneficial in that it cuts the thread and locks it to the spool. Filed: March 14, Date of Patent: December 27, Inventor: Jem Nich. Thread winder and sewing machine provided therewith. Abstract: A thread winder includes a thread winding shaft into which a bobbin shaft is inserted so that a bobbin is detachably attached to the thread winding shaft, a rotating mechanism rotating the thread winding shaft to wind a thread on the bobbin, a thread winding shaft switching mechanism switching the thread winding shaft between a preparatory position and a winding position, a guiding member guiding the thread from a thread spool to the bobbin, a guiding member position switching mechanism switching the guiding member between a guide position and a retreat position, and a link mechanism links both switching mechanisms so that the guiding member is located at the guide position when the thread winding shaft assumes the preparatory position and so that the guide member is located at the retreat position when the thread winding shaft assumes the winding position.
Filed: October 29, Date of Patent: December 13, Assignee: Brother Kogyo Kabushiki Kaisha. Inventor: Hiroaki Fukao. Abstract: A guide member is moved in interlocked relation to a rotary member rotating about the axis of a needle bar, so that a string-shaped material paid out from a bobbin is guided to a needle drop position of a sewing needle.
The bobbin having the string-shaped material wound thereon is supported by a support member that is rotatable generally about the axis of the needle bar and disposed over a machine table in such a manner as to not hamper movement of an embroidery frame. The bobbin can be positioned at a distance from a machine head; thus, bobbins of increased sizes can be used.
The support member is controlled in orientation, by means of a drive source, in accordance with rotation of the rotary member. The bobbin itself revolves around the machine head, which allows the string-shaped material to be constantly appropriately guided to the needle drop position. Filed: November 18, Publication date: May 19, Bobbin thread winder and sewing machine equipped therewith.
Abstract: A bobbin thread winder for sewing machine includes a thread winding shaft to which a bobbin is detachably set, a thread winding shaft gear attached to the shaft and having a gear portion, a gear mounted integrally on a timing pulley so as to be mesh-engageable with the gear portion, and a torque limiter mechanism transmitting rotation of the shaft gear to the shaft when load exerted on the shaft is below a predetermined value.
The mechanism cuts off transmission of shaft gear rotation so that the shaft gear rotation is prevented from transmission to the shaft when the load is not less than the value. The mechanism includes a closely wound portion on a shaft periphery and a coil spring engaged with the shaft gear. The shaft gear rotation is transmitted to the shaft by frictional force of the closely wound portion when the load is below the value.
Filed: May 14, Date of Patent: March 15, Inventor: Munehiro Wakazono. Publication date: September 17, Abstract: A bobbin thread winder mounted in an arm of a sewing machine to wind thread from thread supply onto a bobbin includes a thread winding shaft to which the bobbin is set and which is rotated by a timing pulley, a thread winding shaft gear attached to an end side of the shaft and having a first gear portion rotatable coaxially with the shaft, a second gear portion formed integrally on the timing pulley so as to be mesh-engageable with the first gear portion, and a torque limiter mechanism transmitting rotation of the shaft gear to the shaft when load exerted on the shaft is below a predetermined value, the torque limiter mechanism cutting off transmission of rotation of the shaft gear so that rotation of the shaft gear is prevented from being transmitted to the shaft when load exerted on the shaft is not less than the predetermined value.
Publication date: February 26, Thread device for sewing machine. Abstract: A thread winder unit, which is capable of winding thread of spools set on spool bars, is removably attached to a machine body.
The sewing machine includes a feed motor for feeding the thread during sewing, an upper thread state detecting sensor disposed between the feed motor and the thread winder unit for detecting tensed thread, and a CPU for controlling thread winding operations based on a signal from the upper thread state detecting sensor.
The sewing machine intermittently drives the feed motor in a reverse direction to that in the sewing to feed the thread toward the thread winder unit, every time the upper thread state detecting sensor detects the tensed thread, and the thread winder unit winds the fed thread around the spool. The CPU, recognizing the thread wound by a given amount, stops winding.
Filed: October 11, Date of Patent: May 4, Assignee: Juki Corporation. Inventors: Fumio Wada, Hiroyuki Kotaki. Bobbin for sewing machine. Abstract: A bobbin for a sewing machine which is rotatably disposed in a rotary shell device of the machine to supply and under thread when performing a sewing operation, comprises of winding shaft separately inserted onto a fixed shaft of the rotary shuttle and on which the under thread is substantially wound, a first flange integrally formed at one end of the winding shaft, a second flange integrally formed at the other end of the winding shaft, and a partition flange forming a first winding portion between the first flange and the partition flange and forming a second winding portion between the second flange and the partition flange, a plurality of saw-toothed protrusions being formed at an entire outer circumference of the partition flange, and the protrusions having a linear sidewall that is oriented in a radial direction of the partition flange.
Filed: February 11, Date of Patent: April 27, Assignee: Kobest Co. Lower thread winding device. Abstract: There are provided an upper shaft clutch mechanism , a bobbin 22 including a slit 39, a horizontal holder 4 including an inner holder 18 and a blade tip 42, a bobbin driving member 11, bobbin driving member moving means 94 for moving the bobbin driving member 11 to freely advance or retreat between two positions having a separating position and a connecting position, a thread holding and catching member 48 including an upper thread holding portion 59, an upper thread engaging portion 60 and a thread position regulating portion 58 which are always set in a retreat position and are set in an entry position during a thread winding operation, thread holding and catching member moving means 53 for moving the thread holding and catching member 48 to freely advance or retreat between two positions having a retreat position and an entry position, and a thread winding operation control portion for controlling the operation of each portion during the thread winding operation.
Filed: May 30, Date of Patent: November 4, Assignee: Juji Corporation. Embroidery sewing machine with lower thread winding device.
Abstract: In an embroidery sewing machine having a lower thread winding device, when the non-lower thread state of the bobbin is detected by a residual amount sensor, a sewing machine motor is stopped to detect and recognize the size of the embroidering frame of an embroidering device by means of a frame size sensor and the embroidering frame is moved corresponding to the size to position the corner of a workpiece held in the embroidering frame under a needle.
Then, an extra sewing operation is carried out over the corner to consume the lower thread remaining in the bobbin, and subsequently, it is decided whether or not the embroidering frame is moved by a distance required for completely extracting the lower thread from the bobbin an amount of the residual lower thread is detected when the non-thread state is detected by the residual amount sensor.
Date of Patent: June 17, Publication date: January 16, Applicant: Juki Corporation. Shuttle bobbin for sewing machines.
Abstract: A shuttle bobbin 1 for sewing machines having a first 11 and second 12 disc-shaped end walls concentrically and integrally formed at both ends of a hub. The diameter of the first end wall 11 being larger than that of the second end wall A partition wall 13 is concentrically and integrally formed at an intermediate portion of the hub, thus partitioning the hub into firsts and second winding parts 15a, 15b.
The partition wall 13 is smoothly toothed 13a, 13b at its outside edges, thus having rounded teeth and rounded roots at the outside edges. The diameter of the addendum circle of the toothed partition wall 13 is equal to the diameter of the first end wall 11 while the diameter of the deddendum circle is equal to the second end wall The second winding part 15b , defined by the second end wall and the partition wall, is positioned just under the lowest position of a sewing needle when the bobbin is installed in a sewing machine.
Filed: October 3, Date of Patent: November 6, Assignee: Kosap Tech Co. Inventor: Steve Chang. Automatic bobbin changer and method. Abstract: An apparatus for automatically changing a bobbin case on a quilting machine having a hook drive operatively supporting the bobbin case during a stitching operation. The apparatus includes a staging station adapted to support at least one bobbin case normally having a full spool of thread, and a carriage movable between the staging station and the hook drive.
A finger is movably mounted on the carriage, and the finger moves a release lever on the bobbin to an unlock position and clamps the release lever at the unlock position. A method of using the above apparatus in an automatic bobbin changing operation is also provided. A controller determines the need for a bobbin change, for example, by counting stitches and calculating the thread remaining on the bobbin.
The bobbin change can be carried out between patterns or during a pattern by cutting the bobbin thread or both the top and bottom threads. The sewing of tacking stitches may also be done in sequence with the thread cutting and bobbin changes.
Date of Patent: September 11, Ninety-five percent of all sewing thread that is manufactured is used in commercial and industrial sewing. The spool pin is a piece on your sewing machine that holds the thread while you wind the bobbin. It will be a cylindrical piece that fits the hole in the spool of thread.
X Research source. The spool pin is commonly located on the top or side of the machine. A thimble is a small hard pitted cup worn for protection on the finger that pushes the needle in sewing. Usually, thimbles with a closed top are used by dressmakers but special thimbles with an opening at the end are used by tailors as this allows them to manipulate the cloth more easily. Who invented the sewing machine bobbin? Category: hobbies and interests needlework.
The smoothest action came from a bobbin mechanism invented by Allen B. Wilson in the early s. What was invented in ? American sewing machine. How much did the first Singer sewing machine cost? What is the oldest sewing machine brand? What is the oldest sewing machine? What are the types of sewing machine? Sewing Machines can be categorized into five types:.
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