RU2415977C1 - Zigzag sewing machine - Google Patents

Abstract

FIELD: textile, paper.

SUBSTANCE: zigzag sewing machine comprises mechanisms of a needle 1, a thread takeup 2, a cloth mover 3, a shuttle 4, kinematically joined to the main shaft 5, a bearing block of guide plates 8, including the main guide plate 8.1 of the automatic program of the cloth mover motions, and a device for change of a stitch shape 10 with a cam 13 for smooth adjustment of the stitch length and a transition guide plate to change a puller from the latter to the guide plate of the automatic program of the cloth mover motions and vice versa. According to the invention, the transition guide plate is arranged in shape as an additional guide plate 14 of the automatic program of the cloth mover motions. At the same time the guide plate is arranged so that its average diametre is located at one level with the cam 13 for smooth adjustment of the stitch length, which provides for smooth changeover of the puller 9 and makes it possible to produce additional stitches.

EFFECT: expansion of technological possibilities of zigzag sewing machine with minimum costs for production preparation.

2 cl, 10 dwg

Description

FIELD OF THE INVENTION

The invention relates to the field of sewing machine building, in particular to household zigzag sewing machines designed to make straight, zigzag, special and decorative stitches.

State of the art

Known sewing machine zigzag containing the mechanisms of the needle, thread take-up, engine tissue, shuttle, kinematically connected with the main shaft, presser foot, device for changing the shape of the stitch of the sewing machine zigzag (Auth. Certificate. No. 2023086, IPC D05V 3/02).

The stitch shape changing device is located in the head of the sewing machine and has an axis with a set of copying disks (copy block), a pusher (puller) interacting with it, moving along the axis of the copying disks by means of a mandrel nut. The latter is mounted on a lead screw, which is connected to the Maltese mechanism, a crank with chains of which is mounted on the axis of the shift handle, and a Maltese cross on the end of the lead screw.

The movement of the pusher (puller) from one copying disk to another is carried out along the U-shaped path, while its displacement across the axis of the copying disks is carried out under the action of the cam.

The device is convenient to operate, but differs in complexity due to the presence of the Maltese mechanism, spindle and other elements.

Also known is a zigzag sewing machine containing the mechanisms of a needle, thread take-up, tissue engine, shuttle kinematically connected to the main shaft, having a zigzag sewing machine changing shape line (Auth. Certificate. No. 1089189, IPC D05V 3/02).

The stitch shape changing device contains a separate cam for programmatically controlling the tissue engine, which is kinematically connected through a two-arm lever and a puller with a copier of the automatic program for moving the tissue engine. The puller, in turn, is kinematically connected with a spring-loaded control crank of the tissue motor drive. The cam is also kinematically associated with a cam of smooth regulation of the stitch length. In this case, the kinematic connection contains a spring-loaded rod with an adjustable stop interacting with a finger on the control crank. Both of these cams are fixed to the control handle of the tissue engine control mechanism. By turning the knobs one or the other cam is put into operation and one gets either a complex stitch with control of the fabric engine mechanism, or a zigzag stitch or a simple stitch.

The disadvantage of this solution is its complexity, because it contains two kinematic chains, each of which is associated with a control crank.

Known sewing machine containing the mechanisms of the needle, thread take-up, engine tissue, shuttle, presser foot, having a device for changing the shape of the stitch (Patent RU No. 87706), which we have chosen for the prototype.

Moreover, the stitch shape changing device in the known invention comprises a shaft mounted in the bearings of the body, carrying a copy unit, including a copier of the automatic program of moving the fabric engine, in contact with a puller mounted with the possibility of oscillation in the execution mode of a complex zigzag stitch with combined control of needle mechanisms and a fabric engine kinematically connected to a fabric engine control handle fixed to the axis and a cam for continuously adjusting the stitch length value . According to the invention, it is equipped with a transition copier for transferring the puller from the copier of the automatic program for moving the fabric engine to the cam of smooth adjustment of the stitch length value, made in one piece with the specified copier with a narrow cylindrical side surface and conical surfaces with which it is connected with its troughs and protrusions. In this case, the narrow lateral cylindrical surface is located at the same level with the cam of smooth adjustment of the stitch length, with which the puller has the ability to contact in the mode of performing straight and zigzag stitches with the control of the needle mechanism.

The proposed device in comparison with the known provides a positive effect, which consists in simplifying the design, manufacturability of the manufacture of structural parts.

The disadvantages of the known solutions include the insufficiently high degree of use of the occupied volume of the block of copiers for decorative and special stitches on a sewing machine.

The technical result of the proposed technical solution is to eliminate this drawback by solving the technological capabilities of the sewing machine by replacing the transition copier with a copier, which provides new stitches for the sewing machine to operate in a complex zigzag mode with a combined software control of the needle and the fabric engine.

SUMMARY OF THE INVENTION

The specified technical result is ensured by the fact that in the sewing machine a zigzag containing the mechanisms of the needle, thread take-up, fabric engine, and the shuttle kinematically connected to the main shaft installed in the bearings of the body, carrying a block of copiers, including a copier of the automatic program for moving the fabric engine in contact with the puller, mounted with the possibility of oscillation in the execution mode of the stitch of a complex zigzag with software combined control of the mechanisms of the needle and the tissue engine, a device for changing shapes stitches, including a kinematically connected to the fabric motor control handle fixed on the axis, a cam of smooth adjustment of the stitch length and a transition copier for transferring the puller from the latter to a copier of the automatic program for moving the fabric engine and vice versa, according to the invention, the transition copier is made in the form of an additional copier an automatic program for moving the tissue engine, while the diameter of its protrusions is less than the diameter of the protrusions of the main copier of the automatic program engine tissue, and the diameter of the troughs is made larger than the diameter of the troughs of the specified copier, and the copier is made so that its average diameter equal to half the sum of the diameter of the protrusions and troughs is located at the same level with the cam for smooth adjustment of the stitch length, with which the puller has the ability to contact in the execution mode of the straight and zigzag stitches with the control of the needle mechanism.

And also the fact that the puller is made in the form of a cone with a rounded peak in the form of a sphere.

Below the invention is illustrated by way of example with the accompanying drawings.

Brief Description of the Drawings

Figure 1 shows the kinematic diagram of the proposed device;

figure 2 - block copiers;

figure 3 - copiers of the automatic program of movement of the tissue engine;

figure 4 is a section along aa in figure 3 (rotated);

figure 5 is a cross-section along BB in figure 3 (rotated);

figure 6 is a General view of the machine;

figure 7 - types of lines;

on Fig - the main copier;

figure 9 is an additional copier;

figure 10 - puller.

The implementation of the invention

The zigzag sewing machine contains the mechanisms of the needle 1, the thread take-up 2, the fabric motor 3, the shuttle 4, kinematically connected with the main shaft 5 installed in the bearings 6 of the housing 7, the supporting copy unit 8, including a copier 8.1 of the automatic program for moving the fabric engine in contact with the puller 9 mounted with the possibility of oscillation in the execution mode of the stitching of a complex zigzag with software combined control of the mechanisms of the needle and the tissue engine, a device for changing the shape of the stitch 10, including kinematically connected with a fabric motor control handle 11 fixed to the axis 12, a cam 13 for smoothly adjusting the stitch length and a transition copier to transfer the puller from the latter to a copier of the automatic program for moving the fabric engine and vice versa. According to the invention, the transition copier is made in the form of an additional copier 14 of the automatic program for moving the tissue engine, while the diameter of its protrusions 15 is smaller than the diameter of the protrusions 16 of the main copier 8.1 of the automatic program of moving the tissue engine, and the diameter of the troughs 17 is larger than the diameter of the troughs 18 of the specified copier. Moreover, the additional copier is made such that its average diameter equal to half the sum of the diameter of the protrusions and the diameter of the depressions is located at the same level with the cam 13 for continuously controlling the length of the stitch, with which the puller 9 has the ability to contact in the execution mode of straight and zigzag stitches with the control of the needle mechanism one.

The puller is made in the form of a cone 9.1 with a rounded peak in the form of a sphere 9.2 (figure 10).

Program control of the needle mechanism 1 includes the mentioned block of copiers 8, a pivotally mounted pusher 19 of the needle interacting with one of the copiers in the block (at the operator’s choice), transmitting lateral vibrations to the needle deflection frame 20, carrying the needle bar 21 with the needle 22, by means of angular levers 23 and 24. The frame 20 is mounted on an axis 25, mounted in the housing 7 of the machine. Software control of the tissue engine mechanism 3 includes said copy unit 8, having a copier 8.1 of an automatic program for moving the tissue engine, in contact with a puller 9, pivotally mounted on an axis 26, transmitting movements of the tissue engine 3.1 through an angular lever 27, a spring-loaded three-arm lever 28, a connecting link 29 , the pusher 30, interacting with a three-center cam 31 mounted on the main shaft 5, a rocker 32, bearing the lever 34 of the fabric engine 3.1 articulated in the eyes 33.

With the simultaneous operation of the sewing machine with programmed controls for the mechanisms of the needle 1 and the engine 3 of the fabric, i.e. when the needle pusher 19 interacts with one of the copiers 8.2 in the copy unit 8, and the puller 9 interacts with the copier 8.1 of the automatic program for moving the tissue engine, you can get a more complex pattern, for example, “honeycomb”, “festoon”, etc. (Fig. 7, middle figure).

The stitches shown in Fig. 7 below, similar to the stitches shown in the middle of Fig. 7, are also obtained with simultaneous operation of the sewing machine with programmed controls of the mechanisms of the needle 1 and the fabric motor 3, i.e. when the needle pusher 19 interacts with one of the copiers 8.2 of the copy unit 8, and the puller interacts with the additional copier 14 of the automatic program for moving the tissue engine. The lines obtained in this case are smaller in height, but they are thicker in density and “juiciness” is superior to the lines obtained using the main copier 8.1.

To change the shape of the stitch, for example with programmed control of the needle mechanism 1, i.e. zigzag stitches, or a straight stitch without the participation of program control, it is necessary to transfer the puller 9 from the copier 14 of the automatic program for moving the fabric motor to the cam 13 for smoothly adjusting the stitch length.

The additional copier 14 provides an easy, without “jamming” transfer of the puller 9 to the cam 13. This is achieved due to the small difference in height between the additional copier 14 and the cam 13.

The transfer of the puller 9 from the cam 13 for smoothly adjusting the length of the stitch to an additional copier 14 occurs without “jamming” due to the stripper being made conical and a small difference in height between them.

Translation of the puller 9 is provided by rotating the handle 11 on the axis 12 with a gear 35 fixed to it, interacting with the rack 36, which moves the puller 9 on the axis 26 (Fig. 1).

Translation of the pusher 19, i.e. the choice of the line shown in Fig.7 (upper figure), from one copier 8.2 to another copier 8.3, etc. in the block of copiers is provided by rotation of the line selection handle 37 on the axis 38 with a gear 39 fixed to it, interacting with the rail 40, which moves the pusher on the axis 41.

The design of the translation mechanism of the pusher 19 and the translation mechanism of the puller 9 are similar. Moreover, they are mounted in one unit of the housing 42, which is independently assembled, adjusted and then mounted on the machine.

The foot mechanism 43 is also assembled separately, with its subsequent installation in the machine body.

The figures depicted in Fig. 7 are plotted on the scale 44 of the cover 45. In this case, the numbers printed on the line type selection knob 37 correspond to the numbers on the scale 44 located under the types of lines. Scale 44 is mounted on the lid 45 of the machine.

Figure 1 marked:

46 - electric drive;

47 - reverse feed lever;

48 - lever lifting the paws;

49 - flywheel.

The additional copier 14 not only ensures easy transfer of the puller 9 to said cam 13 without jamming, acting as a transition copier in the known solution, but also expands the technological capabilities of the sewing machine, supplementing it with a whole gamut of new lines. Those. the proposed solution is not just a device for changing the shape of the stitch, but it is primarily a sewing machine with new technological capabilities. And all this thanks to the original design of an additional copier, and at the minimum cost of preparing the production.

Given the usefulness of the invention, namely the expansion of the technological capabilities of the sewing machine by providing it with an additional copier to obtain additional complex stitches, as well as the ability to transfer the puller from an additional copier to a cam for smooth adjustment of the stitch length and vice versa, i.e. the possibility of its implementation using the described tools and methods to ensure that the applicant sees the technical result, it can be argued that the claimed invention meets the requirement of "industrial applicability".

The analysis of the prior art by the applicant, including a search by patent and scientific and technical sources of information and identification of sources containing information about analogues, suggests that the proposed solution meets the requirements of "novelty" and "inventive step".

It should be noted that the advantage of the invention over a close analogue (prototype) is provided by the presented set of essential features, each of which performs its function, and together, in conjunction, they solve the problem of creating a new product that meets modern requirements.

Claims (2)

1. Sewing machine zigzag, containing the mechanisms of the needle, thread take-up, fabric engine, hook, kinematically connected with the main shaft installed in the bearings of the housing, carrying a block of copiers, including a copier of the automatic program for moving the fabric engine, in contact with a puller mounted with the possibility of oscillation in the mode stitching a complex zigzag with software combined control of the mechanisms of the needle and the tissue engine, a device for changing the shape of the stitch, including kinematically connected with the handle control the motor of the fabric fixed on the axis, a cam of smooth adjustment of the stitch length and a transition copier for transferring the puller from the latter to a copier of the automatic program for moving the fabric engine and vice versa, characterized in that the transition copier is made in the form of an additional copier of the automatic program for moving the fabric engine, the diameter of its protrusions is made smaller than the diameter of the protrusions of the main copier of the automatic program for moving the tissue engine, and the diameter of the depressions is made larger than a tray of depressions of said copier, and the copier is made such that its average diameter equal to half the sum of the diameter of the protrusions and depressions is located at the same level with the cam of smooth adjustment of the stitch length, with which the puller has the ability to contact in the mode of executing straight and zigzag stitches with control needle mechanism. 2. The sewing machine zigzag according to claim 1, characterized in that the puller is made in the form of a cone with a rounded peak in the form of a sphere.

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