Brother Kogyo Kabushiki-kaisha

Okamura Co., Ltd.

Masao Ogawa

Takahiro Yamada

Eiji Shibata

Toshio Sasaki

Akifumi Nakashima

Hiroshi Kitazawa

Minoru Sakanobe

Masayuki Seki

Kazutaka Nakajima

Yukio Yamamura

Noboru Ito

A printable embroidery machine includes a sewing machine body, a cloth holding frame holding a workpiece cloth, a frame drive unit which has a mounting part and to which the cloth holding frame is coupled so that the cloth holding frame is moved independently in two horizontal directions perpendicular to each other, and an ink-jet printer. The body or the printer is detachably attached to the mounting part of the frame drive unit separated from the body so that the workpiece cloth held on the cloth holding frame moved by the frame drive unit is printed by the printer. A predetermined sewing reference position of a sewing needle in attaching the body to the frame drive unit corresponds with a predetermined print reference position of a print head of the printer in a case where the printer is attached to the frame drive unit.

Printable embroidery machine

A bobbin thread winding mechanism includes: a rotating member capable of rotating and to which a bobbin can be mounted; a supporter provided to the rotating member and that supports an end of a bobbin thread to be wound around the bobbin; and a positioner that positions the rotating member so that the supporter stops at a predetermined position.

Bobbin thread winding mechanism

A sewing machine includes a stitch forming device which forms stitches on a work sheet by locking an upper and a lower thread with each other, and a tension changing device which changes a tension of the lower thread to stop supplying of the lower thread to the stitch forming device at a predetermined timing. A sewing machine for forming stitches on a work sheet by locking an upper and a lower thread with each other, includes a pattern selecting device which selects one of a plurality of different stitch patterns, a detecting device which detects the selected one stitch pattern, and a tension changing device which changes, based on the detected one stitch pattern, a maximum tension of the lower thread to a corresponding one of a plurality of different tension values.

Sewing machine having lower-thread tension changing device

An apparatus for putting a sewing thread through an eye hole of a sewing needle of a sewing machine, including a hook member having a hook portion movable through the needle eye to catch the sewing thread positioned adjacent to the needle eye; a holding member which cooperates with the hook member to hold the sewing thread; a biasing member which biases the holding member to press the sewing thread against the hook portion of the hook member; a supporting member which supports the hook member, the holding member, and the biasing member such that the three members are movable between a distant position distant from the needle eye and a near position near to the needle eye and are movable at the near position so that the hook portion of the hook member advances and retracts through the needle eye to catch the sewing thread, draw the caught thread through the needle eye, and obtain a loop of the thread; and a releasing member which releases the sewing thread from the hook member by moving the holding member away from the hook portion of the threading hook against the biasing action of the biasing member, at least one of the supporting and releasing members being movable relative to the other member so that the holding member and the releasing member are engaged with each other and the holding member is moved away from the hook portion of the hook member against the biasing action of the biasing member.

Threading apparatus of sewing machine

Apparatus for treating an end portion of a sewing thread which is supplied from a thread supplying device and is guided by a guiding device to pass near a sewing needle of a sewing head of a sewing machine, the sewing head having a front surface facing a user who operates the sewing machine, a rear surface opposite to the front surface, and a side surface connecting between the front and rear surfaces, the apparatus including a downstream holding device which holds the end portion of the sewing thread guided by the guiding device, so as to stretch a portion of the sewing thread near the sewing needle, and a cover member which covers the sewing head, the cover member providing the front, rear, and side surfaces of the sewing head, the downstream holding device being provided on a visible portion of the side surface of the cover member which portion is visible from the user facing the front surface of the cover member.

Apparatus for treating end portion of sewing thread

A threading device comprising a stretching member, a moving member, a threading member and an actuator. The actuator receives threading instructions and drives the moving member. The moving member moves the thread stretched by the stretching member to the front or the rear of the eye in the needle. The threading member threads the eye with the thread positioned in front or at the rear of the eye. The actuator can thus control the movement of the moving member. The thread can securely be positioned in a given position in front or at the rear of the eye, and the threading member can accurately thread the eye in the needle.

Device for stretching a thread and threading a needle on a sewing machine

In the automatic threading device for the sewing machine, the treading rod is lowered and rotated, and the threading hook is automatically inserted into and through the needle eye. However, if the presser-foot detector detects the presser-foot is lowered, the threading rod is prohibited from being operated. Alternatively, if the operation detector detects the sewing-machine motor is being operated, the threading rod is prohibited from being operated. Consequently, even if the operator by mistake presses the threading switch during sewing operation when the presser foot is lowered or the sewing-machine motor operates, the threading rod is prohibited from being driven. Therefore, the threading hook is prevented from being damaged. The threading switch can be provided on the front panel of the sewing machine, near the start-stop switch or in any other easily accessible position.

Automatic threading apparatus on a sewing machine

In a threading apparatus on a sewing machine, the drive source is driven and transmits drive force through a transmission to a moving board. The moving board thus lowers and contacts the actuating rod. The actuating rod in turn lowers, thereby lowering and further rotating the threading rod. The threading hook enters the needle eye. The needle is thus threaded. The moving board is provided separately from the actuating rod. When the drive source or the transmission breaks, the actuating rod can be lowered separately from the moving board. Specifically, without driving the drive source, the actuating rod can manually be lowered, so that the threading rod can lower and rotate, and the threading hook is inserted into the needle eye. Since the needle can thus manually be threaded, the position adjustment in the assembling the threading apparatus is facilitated.

Threading apparatus on a sewing machine

A sewing machine for automatic thread taking-up and threading comprising a guide groove for guiding a needle thread to a threading preparatory position in the vicinity of a needle bar via a thread taking-up preparatory position intersecting a thread take-up moving area, a sewing machine motor driver for extracting the needle thread along the thread take-up moving area and for instructing a thread take-up to catch the needle thread, a pulse motor driver for threading the needle thread to an eye of a needle, a threading switch for generating signals, and an electronic control circuit for controlling the pulse motor driver and the sewing machine driver at prescribed timings in response to the signals from the threading switch. In the sewing machine, an operator has only to prepare a needle thread along the guide groove and push the threading switch. The electronic control circuit then controls the pulse motor driver and the sewing machine driver for the thread taking-up operation and the threading operation, respectively. Any operator can operate the sewing machine with easiness because the thread take-up operation and the threading operation are automatically performed without complicated cam mechanism or linkage mechanism. In addition, the sewing machine is easy to manufacture and the timing of operations can easily be adjusted.

Sewing machine with automatic thread take-up and threading

A sewing machine comprising a threading device and a needle-bar raising means. A threading switch is operated and a sewing machine motor is stopped. Subsequently, thread is passed onto a linkage, a needle bar is disconnected from an arm shaft, and the needle bar is raised to a given position. After the needle bar is set in its uppermost position, thread stretched out from the linkage 38 to the front of an eye in a needle is passed through the eye in the needle. If the end of thread is manually held in front of the eye in the needle to stretch out prior to threading operation, the needle bar does not lower, thus enhancing operational safety and preventing thread from loosening.

Sewing machine provided with a threading device and a needle bar raising

A sewing machine for automatic thread take-up and threading, which comprises a guide groove for guiding a needle thread from a bobbin to a threading preparatory position via a thread take-up preparatory position, a sewing machine motor driver and a sewing machine motor for extracting the needle thread at the thread take-up preparatory position along the thread take-up moving area and for taking up the needle thread using a thread receiver and/or a thread take-up, and a thread positioning member for keeping the end of the needle thread guided to the threading preparatory position and for positioning the needle thread in front of or at the rear of the eye of a needle, a threading member for performing the threading operation of the needle thread, and a prohibiting member for prohibiting the threading operation until the thread take-up operation is over. In the sewing machine, the thread take-up operation and the heading operation are automatically and successively performed. The needle thread is kept at its end by a thread positioning member and a tension member is opened during the thread take-up operation. Therefore, the end of the needle thread is not drawn toward the thread take-up. The operator has only to put the needle thread along the guide groove and does not have to prepare the needle thread twice for the thread take-up operation and the threading operation.

A sewing machine including an automatic thread taking-up operation which comprises an arm of a thread take-up projecting beyond a thread holding member, a needle thread carrying member for introducing the needle thread into the thread holding member when the thread take-up swings toward one end of a thread guide, a pathway for the needle thread formed in the thread holding member, a blocking member for preventing the needle thread from slipping out of the thread holding member, and a crossing member for helping the needle thread carried beyond the thread taking-up member to cross the thread guide. The sewing machine can easily perform thread taking-up operation and threading operation while the thread take-up swings vertically.

Sewing machine for automatic thread taking-up operation

In a device for disconnecting a needle bar from a needle-bar connecting stud on a sewing machine, a drive source drives a moving board. The moving board lowers a predetermined distance until a threading hook goes through an eye in a needle. A disconnecting member rotates a clutch click and disconnects the clutch click from a needle-bar connecting stud. The needle bar thus disengages from the needle-bar connecting stud. The moving board further lowers, an actuating rod lowers, the actuating rod in turn lowers a threading rod, the threading rod further rotates, and the threading hook goes through the eye. The needle is thus threaded. The disconnecting operation and the threading operation are carried out by using the drive source in common. Consequently, the device is simple in structure and compact in size. Since the needle bar only rises to disengage from the needle-bar connecting stud, no scratches are given on the fabric. The sewing machine can effectively execute pattern-sewing, basting and other operations.

Apparatus for disconnecting a needle bar and threading on a sewing

A thread securing device in a sewing machine wherein an upper thread located along a thread guiding path is caught during the travel of a thread take-up member to effect automatic hooking of the thread thereto. The thread securing device includes a thread saving member capable of saving an amount of the upper thread corresponding to a predetermined amount of the upper thread to be taken up by the thread take-up member during its movement from a thread loosening position to a thread take-up position, and capable of feeding the saved amount of the upper thread freely in accordance with the thread take-up movement of the thread take-up member; and an actuating member adapted to catch the upper thread extending along the thread guiding path when the thread take-up member is not holding the upper thread and then supply an amount of the upper thread corresponding to the predetermined amount, to the thread saving member.

Thread securing device in a sewing machine

In a sewing machine provided with a thread supply stopping device for selectively controlling supply of a needle thread between a needle thread supply source and a take-up lever, an adjustable pre-tension exerting device exerts a tension equal to or lower than a tension of a bobbin thread on the needle thread between the needle thread supply source and the thread stopping device.

Growing community of inventors

Nagoya, Japan

Masao Ogawa