RU2283388C1 - Method for temporary joining of fabrics and small-sized sewing machine for effectuating the same - Google Patents

Abstract

FIELD: sewing industry, in particular, construction of small-sized sewing machines with single-thread stitch.

SUBSTANCE: method involves introducing curved needle with thread inserted into needle eyelet into fabric layers to be joined; turning needle until it exits fabric at a distance from site where it was introduced, and forming loop from thread by moving said needle in reverse direction; seizing loop by its one side, providing running thereof around other side and drawing it through loop; thereafter, ceasing displacement of needle to the initial position and tightening node; repeating all mentioned steps at distance equal to stitch pitch. Sewing machine has needle guiding mechanism, looper mechanism and toothed rack. Needle guiding mechanism has base, guide fixed on base, rack movable along guide and pivotally connected with needle holder having curved needle. Needle holder is moved relative to rack by means of tie-rod and rack is also movable relative to base by means of tie-rod. Looper mechanism has base pivotally connected to bar, looper provided with nose part, and thread stretching hook with axis of rotation. Base is turned by means of tie-rod and hook is also turned by means of tie-rod. Upon passage of needle through fabric and turning of looper base around axis, looper nose part draws out thread. Once hook is turned, loop is formed, said loop being tightened on thread following it during reversal of needle.

EFFECT: increased precision in forming of single-thread stitch, provision for producing of readily unraveled stitch and reduced intensity of manual labor.

6 cl, 16 dwg

Description

The invention relates to sewing machines with single-line stitching, namely, small-sized sewing machines designed for temporary connection of fabric layers located on the surface of the table, and can significantly simplify the manual basting of garments during preparatory operations in individual sewing, manufacturing of bedspreads and other manual works.

The prior art sewing machines with single-line stitching. So, in the description of the invention to the patent of the Russian Federation No. 1687678, IPC D 05 B 13/02, publication date 10/30/1991, [1] a sewing machine is presented containing needle bar and looper mechanisms on one side of the fabric to be sewn, the needle bar mechanism contains a needle holder with a curved needle fixed in it, connected to the guide with the possibility of movement relative to it, the looper mechanism includes a looper configured to rotate around the axis, and a return spring. The disadvantage of the invention [1] is the implementation of the kinematic connection between the needle holder and the looper with a guide in the form of a gear train, which increases the complexity of manufacturing a sewing machine, as well as the inability to make a seam on a fabric located on a plane.

In the description of the invention to the patent of the Russian Federation No. 1798414, IPC D 05 B 1/06, 32/00, publication date 02/28/1993, [2], a small-sized sewing machine containing needle bar and looper mechanisms is presented, the needle bar mechanism contains a base, a needle holder with a needle and a rail fixed in it, the needle holder is mounted on a rail that is pivotally connected to the base, the looper mechanism includes a base, looper, thread draw hook, return spring, looper connected to the base via a link mechanism consisting of pivotally connected to Considerations and the rocking lever, wherein one lever arm is connected to the looper, and the other - with the rocker arm by means of interacting with a groove of the leash. The disadvantage of the invention [2], taken as the closest analogue, is the placement of the needle bar and looper mechanisms on opposite sides of the processed fabric, which reduces the accuracy of single-stitching and limits the distance from the seam to the edge of the fabric. In addition, it cannot be used to make easily dissolving basting seams.

The problem to be solved is to ensure that the seam can be made on the material lying on the table. The technical result consists in increasing the accuracy of one-line stitching, as well as in performing easily dissolving temporary seam and a significant reduction in the amount of manual work in the clothing industry.

The technical result is achieved by the fact that the method of temporary connection of tissues consists in introducing a curved needle with a thread inserted into the eye into the connected tissue layers, turning the needle until it leaves the tissue at a distance from the injection site and forming a loop from the thread by moving the needle in the opposite direction, then with the help of a looper, they grab one side of the loop, bend around its other side and pull it through the loop, after which they finish moving the needle to its original position and tighten the knot, repeat all of the above era tio a distance equal to step stitch.

The technical result is also achieved by the fact that a small-sized sewing machine for temporary tissue connection, as in the closest analogue [2], contains mechanisms of a needle bar, looper and gear rack, the needle bar mechanism contains a base, a needle holder with a fixed needle and a rail, a needle holder is installed on the rail, which is pivotally connected to the base, the looper mechanism contains a base, looper, thread hook, return spring, but unlike the closest analogue, the needle bar mechanism the guide fixed to the base, connected to the rail with the possibility of its movement, the needle bar is connected to the rail by a hinge, the needle is curved, the hinge of the looper with the base is made in the form of a vertical rod with a hinge connected to the looper and covering the rod, the looper contains a loop forming hook connected to the looper by means of a hinge and equipped with a return spring, and the hook for drawing the thread is pivotally connected to the looper base.

In addition, the needle bar mechanism is equipped with a needle holder rotation drive containing a variable-length rod, pivotally connected to the rail and with a lever fixed to the axis of the rod-articulated joint, and a rail rotation drive containing a variable-length rod, pivotally connected to the base and the rail.

In addition, the looper mechanism is equipped with a loop forming hook rotation drive comprising a variable-length rod mounted on the looper and pivotally connected to a lever fixed to the rotation axis of the loop forming hook.

In this case, the needle holder, rail, looper and loop forming drives are made in the form of electromagnetic relays, and the looper mechanism is connected to the base with the possibility of mutual movement.

The invention is illustrated by drawings.

Figure 1 presents a side view of a small sewing machine.

Figure 2 presents a view And figure 1.

Figure 3 shows the remote element B when removing the looper thread from the needle.

Figure 4 shows a view In figure 3 when removing the looper thread from the needle.

Figure 5 shows a view of G in figure 3 when removing the looper thread from the needle.

Figure 6 shows the initial position of the needle bar mechanism before inserting the needle into the tissue.

7 shows a diagram of the action of the needle bar mechanism when introducing the needle into the tissue.

On Fig shows a diagram of the mechanism of the needle bar when the needle is rotated in the fabric.

Figure 9 shows a diagram of the action of the needle bar mechanism when flashing the fabric and the position of the needle bar mechanism before starting the loop formation.

Figure 10 shows the movement of the looper hook and its capture of one side of the loop.

Figure 11 shows the retention of the thread on the nose of the shuttle before the final phase of the formation of the node.

12, 13, 14 and 15 show the formation of a needle thread assembly.

On Fig shows a single-line seam made by a small-sized sewing machine.

Small-sized sewing machine consists of a needle bar mechanism, looper mechanism and gear rack mechanism (Figs. 1, 2).

The needle bar mechanism comprises a base 1 on which a guide 2 is fixed, a rail 3 moving along it, for example, by means of rollers 4, 5, 6 located on both sides of the guide 2. In this case, the rollers 4 and 6 can be located on top, and the roller 5 - below guide 2, or vice versa. On the rail 3 by means of a hinge 7, a needle holder 8 is installed with a curved needle 9 fixed therein with an eye at the end (not shown). The spool of thread can be attached to the base 1 (not shown). A lever 10 is attached to the axis of the hinge 7, which is connected at one end to a variable length rod 11 (FIGS. 1, 2) by means of a hinge 12. The other end of the variable length rod 11 is connected to a rod 3 by a hinge 13. The rod 3 is connected to the rod by a hinge 14 15 of variable length, which is connected to the base 1 by means of a hinge 16 (figure 1).

The rail 3 can be made in the form of two plates, between which the rollers 4, 5, 6 are installed. The axis of the hinge 7 of the needle holder 8, the rollers 4, 5, 6 and the hinge supports 13, 14, 16 are parallel to each other and perpendicular to the plane of the rail 3 and the guide 2 (figure 2).

The looper device (FIGS. 1, 2) consists of a vertical rod 17 fixed on the base 1, a looper base 18, rotatable relative to the axis of the rod 17, a thrust rod 19 by a variable length fixed on the rod 17, a return spring 20, one end which is connected to the base 18 of the looper, and the other end to the rod 17. On the base of the 18 looper is installed a drive 21 to turn the hook 22 of the looper. The drive 21 may be in the form of a screw connection or, for example, a gear gear 23, 24, which drives the loop hook 22.

The axis of the gear 24 is connected to the return spring 25, which returns the loop hook 22 to its original position. A variable-length rod 19 rotates the looper base 18 to grip the needle thread. The rod 19 is fixedly mounted on the vertical rod 17. The rod of the rod 19 comes into contact with the bottom surface of the looper base 18, which is located at an angle to the rod 17. This creates a cam mechanism that rotates the looper base 18 around the rod 17 to capture the needle thread when extending the rod thrust 19 and return to its original position by spring 20 when removing the load from the rod rod 19.

The gear rack mechanism consists of a gear rack 26 and a thrust rod 27 of variable length (FIG. 2).

Rods 11, 15, 19, 27 of variable length can be made in the form of screw mechanisms, hydraulic cylinders, pneumatic cylinders, etc. Actuation of the needle bar, gear rack 26 and looper mechanisms that make up a small-sized sewing machine is possible manually, as well as by means of an electric drive interacting with the corresponding draft, in the preferred embodiment, in the form of electromagnetic relays triggered by a signal from a switch or control system ( not shown).

Small-sized sewing machine operates as follows, implementing the proposed method.

The sewing machine is installed on the spread layers of fabric 28 (figures 1, 6, 7). Next, manually or by means of a variable length of the power drive connected to the rod 11, the needle holder 8 is rotated relative to the axis of the hinge 7 mounted on the rail 3, and a curved needle 9 is inserted with the thread threaded into the eye into the connected fabric layers almost perpendicular to its surface (Figs. 6, 7). Then, using the rod 15, the rail 3 is moved along the guide 2. In this case, the angle of entry of the bent needle 9 into the fabric layers changes until the end of the needle 9 is tangent to the surface on which the fabric lies. At the same time, by means of a thrust 27 of variable length, the toothed rack 26, moving, forms a fold of fabric 29. Then, by means of a thrust 11, the rotation of the needle holder 8 around the hinge 7 is completed until the needle 9 exits the fabric. Then the rod 11, returning to its original position, rotates the needle holder 8 in the opposite direction, forming a loop from the thread in the form of the letter "L" (Fig. 12).

Then, with the help of the rod 19, the looper base 18 is set in motion, which, moving around the rod 17, removes the formed loop from the needle 9. After that, the rod 21 drives the looper hook 22, which, being on the back side of the loop together with the looper nose 30 ( Fig.13), making a rotation around the axis 31 of the gear 24, envelops the side of the loop (Fig.14), which comes out of the fabric and captures the second side of the loop (Fig.10). Further, removing the load from the rod 21 using the return spring 25, the looper hook 22 moves in the opposite direction with the captured thread and is held on the looper nose 30 (Fig. 11). Further, removing the load of the thrust 19 using the return spring 20, the looper base 18, returning to a similar position, thread the thread held on the looper nose 30 into the loop (Fig. 14). Further, removing the load from the thrust 11, the needle 9, returning to its original position, tightens the node (Fig.15).

Simultaneously with the reverse stroke of the needle 9, a force is applied to the thrust 21, while the hook 22 is rotated relative to the axis 31, releasing the held thread on the nose 30 of the shuttle. As a result, a thread is fixed on the thread 32 following the needle 9 to fix the position of the stitch on the surface of the fabric, with the formation of the seam shown in Fig. 16. Next, the thread 32 is trimmed, or the base 1 is transferred to a distance equal to the pitch of the stitch, and the cycle repeats.

The location of the needle bar, looper and gear rack mechanisms on one side of the fabric surface allows seams to be made directly on the spread layers of the fabric. As a result, the accuracy of the seam is increased, convenience is provided for approaching the layers of fabric to be connected and a seam is formed that is strong enough, non-stop, elastic and easy to dissolve.

The completeness of the disclosure in the description of the invention of the device of a small-sized sewing machine allows it to be manufactured at any specialized enterprise.

Claims (6)

1. A method of temporarily connecting tissues, which consists in introducing a curved needle with a thread inserted into the ear into the layers of tissue to be connected, turning the needle until it leaves the tissue at a distance from the injection site and forming a loop from the thread by moving the needle in the opposite direction, then with the help of a looper, they grab one side of the loop, envelop it with its other side and pull it through the loop, after which they finish moving the needle to its original position and tighten the knot, repeat all the above operations at a distance equal to the pitch of the stitch a. 2. A small-sized sewing machine for temporary connection of fabrics, containing the needle bar, looper and gear rack mechanisms, the needle bar mechanism includes a base, a needle holder with a fixed needle and a rail, a needle holder mounted on a rail that is pivotally connected to the base, the looper mechanism contains a base, looper , the thread drawback hook and the return spring, the looper is pivotally connected to its base, characterized in that the needle bar mechanism is equipped with a guide fixed to its base, connected with the rail with the possibility of its movement, the needle bar is connected to the rail by a hinge, the needle is made curved, the hinge of the looper with the base is made in the form of a vertical rod with a hinge connected to the looper and covering the rod, the looper mechanism includes a loop forming hook connected to the looper by the hinge and equipped with a return spring, and the hook for drawing the thread is pivotally connected to the base of the looper mechanism. 3. The machine according to claim 2, characterized in that the needle bar mechanism is equipped with a needle holder rotation drive containing a variable-length rod, pivotally connected to the rail and with a lever fixed to the axis of the rod-articulated joint, and a rod rotation drive containing a variable-length rod pivotally connected to the base and rail. 4. The machine according to claim 2, characterized in that the looper mechanism is equipped with a loop forming hook rotation drive comprising a variable-length pull rod mounted on the looper and pivotally connected to a lever fixed to the rotation axis of the loop forming hook. 5. The machine according to claim 4, characterized in that the drives of the needle holder, rail, looper and loop forming hook are made in the form of electromagnetic relays. 6. The machine according to claim 2, characterized in that the looper mechanism is connected to the base with the possibility of mutual movement.

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