JPH0673Y2 - Thread feeder for double chain stitch sewing machine - Google Patents

Description

TECHNICAL FIELD The present invention relates to a looper thread supplying device for a double chain stitch sewing machine.

2. Description of the Related Art A looper yarn supplying device of this type is disclosed in, for example, Japanese Patent Publication No.
As disclosed in Japanese Patent No. 43715, a sewing machine thread is guided from a bobbin installed on a thread spool bar to an auxiliary thread tensioner in a machine frame through a main thread tensioner provided outside a sewing machine frame, and then a stitch is formed. It guides to the looper through a yarn dispenser designed to absorb a slack of the yarn while paying out a predetermined yarn length suitable for it, and a guide is provided between each member to smoothly guide the yarn. .

The problem to be solved by the invention is that the conventional looper yarn feeding device has a large number of parts, and there is a problem that it takes a lot of time to assemble or adjust this in the sewing machine. When it is integrally formed as in No. 55-25879, there is a problem that a wide space is required in the main axis direction of the sewing machine and the threading work becomes difficult.

Therefore, an object of the present invention is to facilitate the assembling and adjustment of the looper thread supplying device in the double chain stitch sewing machine, to effectively install the space in the sewing machine bed, and to facilitate the threading operation. To prevent the thread tension regulator from slackening.

Means for Solving the Problems In the looper thread supply device for a double chain stitch sewing machine of the present invention, a thread tensioner and a thread guide hole are provided on one side in the longitudinal direction of the thread guide base made of a bending plate, A vertical surface and a horizontal surface are formed on the other side, and the vertical surface is provided with a mounting portion for the sewing machine frame, and is threaded and screwed with an elongated plate having an action portion along the longitudinal direction, and the horizontal surface is provided with the above-mentioned. An opening formed of a long hole extending in the longitudinal direction is provided, and the action section of the thread separating unit and a thread take-up cam fixed to a shaft orthogonal to the longitudinal direction and rotating in conjunction with the main shaft of the sewing machine are loosely fitted in the opening. At the same time, a yarn path of one shape extending along the above-mentioned thread-spreading and having its tip side opened is provided on the horizontal plane near the opening so that the thread is engaged with the thread-spacing and the thread winding cam. Eyelet for threading Is provided as a first solution.

The second means is to provide a mark serving as a reference for mutual alignment on at least one of the fixed thread separating body and the thread reeling cam in the looper thread supplying device of the double chain stitch sewing machine. Since a simple hole is provided, the lowest part of the hole may be used as a mark, or a marking or a scale may be provided.

Further, a third solving means is, in a looper thread supply device for a double chain stitch sewing machine, a thread tension disc is fitted to one side of a screw rod, and a thread tension nut having a retaining ring fitted to a screw hole is fitted to the other side. At the same time, with a spring interposed between the two, a thread tensioner that adjusts the thread holding pressure by the thread tension tray by rotating the thread tension nut, and a thread delivery that allows the thread to be delivered in conjunction with the sewing machine. It is preferable to use a ring with a claw made of a thin metal plate for this retaining ring.

Function This device mounts the vertical mounting part on the machine frame, and allows the sewing machine thread supplied from the thread supply source through the main thread tension device to be punctured,
Thread tension device, eye hole, thread path, thread take-up cam, thread handling, thread path,
It can guide the looper through the eyelet and supply a predetermined amount of thread to the looper when the sewing machine is rotated. It is not necessary to install thread tension devices, threaders, thread paths, etc. individually on the sewing machine. It is possible to prevent the parts from being scattered at the time of mounting the thread supply device and at the time of replacement and replacement, and to reduce the number of steps for the mounting positioning adjustment. Further, since there is a mark when adjusting the yarn supply amount, the work can be performed accurately and quickly. Further, the tension of the double ring looper thread is generally adjusted by a main tensioner and an auxiliary tensioner, and the thread tensioner in this type of device is designed to give a very small tension as an auxiliary tensioner, In the conventional device, when the thread tension nut is stopped at an intermediate position where almost no reaction force due to the spring is applied, the thread tension nut is unstable and easily loosened, but according to the present invention, the looseness of the thread tension nut can be prevented.

Furthermore, since the yarn path of the yarn handling portion of this device has a single opening, the threading operation can be facilitated.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. 1 to 3. In this looper thread feeder, as shown in FIGS. 1 and 2, an auxiliary thread tensioner 2 is provided on a thread guide 1 made of a bent plate. When,
A thread reeling device 5 that uses a combination of two cam plates 3 and 4 that rotate in conjunction with the sewing machine is provided to form a unit, and is attached to a sewing machine frame (not shown) with a screw 6. The auxiliary thread tension device 2 is formed by fitting a thread tension disc (not shown), a coil spring 9 and a thread tension nut 10 to a screw rod 8 which is erected on one of the vertical surfaces 7 of the thread guide 1. As shown in FIG. 3, the thread tension nut 10 has a ring 12 with a claw made of an elastic thin plate fitted into a screw hole portion of a metal nut body 11 and a knurled synthetic resin 13 on the outside. It is covered with a molding. In this thread take-up base 1, the vicinity of the auxiliary thread tension device is obliquely bent to form eye holes 14 and 15 for thread guide, and the vertical surface 7 on which the auxiliary thread tension device 2 is mounted is provided with a screw 16 and the aforementioned thread. The screw 6 is fitted, the thread separating member 17 is fixed by the screw 16, and the thread reel 1 is configured to be rotatable with respect to the machine frame of the sewing machine by using the screw 6 as a stepped screw. In addition, the upper side of the vertical surface 7 is bent to form a horizontal plane 18 and an opening 19 is provided, and a thread handling member 17 is provided at the center of the opening 19 and the cam plates 3 and 4 are provided on both sides thereof. There is. Further, on the horizontal surface 18, a pair of yarn paths 21 having a long groove-shaped opening 20 are formed.
22 are arranged symmetrically on both outsides of the cam plates 3 and 4 to form the long holes 2
3, 24 so that the position can be adjusted, and the horizontal plane 1 on the opposite side of the thread guide 1 from the auxiliary thread tensioner 2 is fixed.
The end portion of 8 is bent upward to provide a thread guide eye hole 25. The yarn path 21 is omitted in the second part. Further, the thread separating member 17 has a lower surface 26 as a working surface, a positioning hole 27 is provided in the vicinity of the tip thereof, and the cam plates 3 and 4 are mounted on the main shaft 28 of the sewing machine by screws 29, 30, 31 so that the mounting angle can be adjusted. There is. Then, the cam plates 3 and 4 are properly attached by aligning the position of the marking 32 provided on the inflection part of the cam plates 3 and 4 at the top dead center of the sewing machine needle (not shown) with the bottom of the hole 27. I am able to

In the device constructed as described above, for example, the sewing machine thread T supplied from a thread supply source through a main thread tension device (not shown) to the side surface of a sewing machine bed for safety sewing is used in the eyelet 1 of the apparatus.
4, guiding to the looper of the sewing machine through the auxiliary thread tensioner 2, eyelet 15, thread path 21, upper surface of plate cam 4, lower surface 26 of thread separating device 17, upper surface of plate cam 3, thread path 22 and eye hole 25, A predetermined amount of yarn is supplied to the looper of the sewing machine with the rotation of the sewing machine main shaft 28. In this device, the auxiliary thread tensioner 2 and the thread reeling device 5 are unitized on the thread reeling base 1. Therefore, it can be easily attached to the sewing machine with only the screw 6. In addition, when the thread take-up device 5 is aligned at the time of mounting or when adjusting the thread take-up amount, first, the gap between the lower surface 26 of the thread separating machine 17 and the horizontal plane 18 is held at a predetermined distance with a gauge or the like, and the screw 16 is first tightened. Positioning of the thread separating member 17 is performed, and then the sewing machine main shaft 28 is rotated. When the marking 32 provided on the inflection portion of the cams 3, 4 at the top dead center of the sewing machine needle is aligned with the lower surface of the hole 27 of the thread separating member 17, the screw 29,3
The correct position can be set by simply tightening 0. In addition,
In this embodiment, the lower surface of the hole 27 is omitted as a reference mark for alignment. Also this hole 2
It is also possible to insert a gauge rod into 7 and bring cams 3 and 4 into contact with the lower surface of the rod for positioning. Further, the thread tension of the looper thread is adjusted by rotating the thread tension nut 10, but since the ring 12 with a claw is fitted in the screw hole portion, the thread tension nut 10 can be easily loosened. There is no.

In this way, since this device is unitized, it can be easily attached to the sewing machine, and the hole 27 provided in the thread separating device 17 is for checking the adjustment amount when minutely adjusting the attachment angles of the cams 3 and 4. Will be a mark of. Also, the yarn path 2 used here
Since 1 and 22 have the long groove-shaped openings 20, the threading operation can be easily performed. Further, the auxiliary thread tension device 2 does not loosen without using a split screw or the like, and the cost can be reduced.

Effect of the Invention As described above, the looper thread supply device of the present invention can be easily assembled and adjusted on the sewing machine, and the thread tension device and the thread take-up cam are arranged in the longitudinal direction orthogonal to the sewing machine main axis to allow the thread tension to be adjusted. It is not necessary to lengthen the sewing machine bed by arranging the machine in an appropriate space off the main axis of the sewing machine. There is an effect.

[Brief description of drawings]

FIG. 1 is a plan view, FIG. 2 is a partially cutaway front view, and FIG. 3 is a partial sectional view. 1: Thread guide, 2: Auxiliary thread tensioner 3, 4: Cam plate, 6: Screw, 7: Vertical surface 10: Thread tension nut, 12: Ring 14, 15, 25: Eye hole, 17: Thread separation 18: Horizontal plane, 19: opening, 21, 22: thread guide 27: hole, 28: sewing machine spindle, 32: engraving

Claims (3)

[Scope of utility model registration request] 1. A thread tensioner and a thread guide hole are provided on one side in the longitudinal direction of a thread guide made of a bending plate, and a vertical surface and a horizontal surface are formed on the other side, and a sewing machine is provided on the vertical surface. An attachment portion to the frame is provided, and an action portion along the longitudinal direction is screwed with a thread handle made of a slender plate, and an opening portion formed of a long hole extending in the longitudinal direction is provided on a horizontal plane, and the opening portion is provided with the above-mentioned portion. The action portion of the thread separating member and a thread take-up cam fixed to the shaft orthogonal to the longitudinal direction and rotating in association with the main shaft of the sewing machine are loosely fitted and arranged on the horizontal surface near the opening along the thread separating member and the tip side thereof. A looper thread for a double chainstitch sewing machine in which a thread path having an opening is provided so that the thread engages with the thread separating cam and the thread take-up cam, and a hole for threading is provided at the end on the horizontal surface side. Supply device. 2. A looper thread supply device for a double chain stitch sewing machine according to claim 1, wherein at least one of the thread separating body and the thread take-up cam is provided with a mark serving as a reference for mutual alignment. 3. The thread tension adjuster comprises a coil spring fitted to a screw rod and a thread tension nut for adjusting thread clamping pressure by the spring, and the thread tension nut has a retaining ring for preventing rotation in a screw hole. The looper thread supply device for a double chain stitch sewing machine according to claim 1, wherein