RU2003743C1 - Zigzag sewing machine - Google Patents

Abstract

The inventive zigzag sewing machine contains the basic mechanisms of the needle, shuttle, nitrite givatel, presser foot, fabric motor and zigzag mechanism with copy unit. To expand technological capabilities, the machine is equipped with a fabric motor control mechanism that is mounted on the end wall of the machine body on the flywheel side. The mechanism contains a gear a transmission, the drive gear of which is rigidly fixed on the main shaft, and the follower is mounted freely on the intermediate shaft and carries a cam for automatic grams of movement of the tissue engine, which is activated by turning the handle of the tissue engine control mechanism. When the handle is rotated, the specified cam provides the gear rack movement according to the scheme: forward - forward - backward. The automatic tissue engine switching program can be combined with any zigzag program 2 zpf-5, 5 il.

Description

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The invention relates to sewing machine-building and relates to igzag sewing machines for straight, zigzag, special and decorative stitches.

Known sewing machine is a zigzag machine containing mechanisms of needle bar, shuttle and fabric moving kinematically connected with the main shaft, the last of which has a crank and Sv connected to a zigzag mechanism having a gear rack with a pusher pivotally mounted on it, in contact with a copier unit and connected to the needle bar deflector frame, a stitch selection handle 15 connected to the plunger. The tissue engine control mechanism has a handle, on the axis of which a length adjustment cam is mounted, quilts connected to the fabric engine mechanism, and 20 a puller in contact with one of the zigzag mechanism copiers, and a drive 1.

The presence of a large number of mechanisms for performing a number of technological operations increases the cost of mastering and manufacturing 25 machines, as well as complicates its maintenance during operation.

Also known is a zigzag sewing machine 2 having a pusher and a block of copiers mounted on a shaft and connected to a needle bar deflector frame 30, a stitch selection knob connected to the pusher, a fabric motor control mechanism having a handle, on the axis of which a length adjustment cam is mounted stitch, sv - 35 connected with the mechanism of the fabric motor, and a puller in contact with one of the copiers of the zigzag mechanism, and the drive.

At the same time, the handle of the fabric engine control mechanism has an additional 40 cam for programmatically controlling the fabric movement, and the cam of the automatic fabric engine movement program is mounted on the copy unit and interacts with the puller, which is kinematically connected to the advance shaft.

A drawback of this machine design is the presence of a non-rigid closure of a number of elements that control the tissue engine, with master programs 50 mono-carriers, which, in turn, can serve as one of the reasons for unstable stitching.

Another drawback is the relatively difficult assembly, especially of the 55 parts that control the tissue engine, because they are mounted at best in small assemblies, but essentially individually.

This, in turn, creates difficulties in setting up and adjusting the machine. The manufacturing of the case is also difficult, since mounting a series of elements, in particular parts controlling the tissue engine, requires boring under the mounting axes and threading to secure the springs. All this increases the complexity of manufacturing the machine.

The aim of the invention is to remedy these drawbacks.

This is achieved by the fact that the tissue engine control mechanism is mounted on the flywheel end wall of the machine body. Such mounting provides ease of installation and easy access to the mounted parts; the housing of the reinforced concrete does not undergo any changes, except for a series of bores on the rear end surface. In this case, the tissue engine control mechanism is made in the form of a gear transmission, on the driven gear of which a cam is mounted for the automatic program of moving the tissue engine and which interacts with one end of the two-armed lever, its other interacts with one end of the three-armed lever, kinematically connected simultaneously with cam for programmatically controlling the tissue engine and the backstage of the mechanism for horizontal movement of the tissue engine, while the pinion gear is rigidly fixed to the main shaft And knowledge gear is loosely fitted on the intermediate shaft. The parts included in the motor control structure of the fabric are easy to manufacture and easy to mount on a machine.

Another advantage of the proposed machine is the design of the device for winding the thread on the shuttle spool, the operation of which is carried out from the drive belt, transmitting rotation from the electric motor to the flywheel of the machine.

The device for winding the thread on the shuttle bobbin is made in the form of a spring-loaded two-flange sleeve interacting with the drive belt and bearing a bobbin rod, and a spring-loaded two-shoulder lever, one end of which in the on position interacts with the thread wound on the bobbin and the other interacts with the bushing flange at the time of disconnection Using a drive belt as a drive for winding threads simplifies the design of the drive of the device and reduces the number of parts of the specified tool and.

The advantage of the machine should also include the design of the vertical mechanism

moving the fabric motor for easy control of raising and lowering the rack, for example, when embroidering by pressing the handle of the self-locking lever once.

For this, the mechanism is made in the form of an eccentric mounted on a shuttle shaft, interacting with one end of an axis pivotally mounted on a self-locking lever, the other end of which interacts with the free end of the spring-loaded gear rack lever.

The whole structure is made in the form of an autonomous unit, which is then mounted in the platform of the machine.

In FIG. 1 shows the proposed machine, General view; in FIG. 2 is a kinematic diagram of a cam machine of an automatic program for moving a tissue engine in a working position; in FIG. 3 is a kinematic diagram of a tissue engine program control mechanism with a cam of an automatic program for moving a tissue engine in an idle position; in FIG. 4 - kinematic diagram of the mechanism of vertical movement of tissue engines with gear rack in the lower position (inoperative); in FIG. 5 is a thread winder.

The zigzag sewing machine consists of needle mechanisms 3 mounted in the housing 1 and connected to the main shaft 2, the shuttle 4, the zigzag with the copy unit 5, (fabric motor 6, thread givatel 7. The machine also includes a presser foot mechanism 8, a winding device 9 threads on the shuttle spool and drive 10.

The needle bar mechanism 3 comprises a frame 12 pivotally mounted on the axis 11, in which a bar 13 of the needle bar supporting the needle 14 is mounted. The frame 12 is provided with a spring 15 in the lower part and a horizontal lever 16 in the upper part.

The reciprocating movement of the rod 13c by the needle 14 is provided from the main shaft 2 through the crank 17, the connecting rod 18. The lower end of the connecting rod 18 has a pin 19 which is pivotally mounted on the lead 2D. When the main shaft rotates, the needle makes a reciprocating motion and, when the machine performs a zigzag stitch, can be deflected together with the frame 12.

The machine uses a hinge-rod type hinge (articulated) thread filler.

The lever of the givatel niteprite 21 is pivotally connected to the connecting link 22, worn with its sleeve on the hinge pin 23 fixed in the machine body. The lower lever head of the givatel nitrite gimbal is pivotally connected to the connecting rod 18. The shuttle mechanism 4 includes a shuttle shaft 24 installed in the bushings and using crank 35 and connecting rod 26 kinematically connected to the main shaft 2.

The reciprocating motion of the shuttle 27 receives through a bevel gear 28.

The movement of the materials to be ground is carried out by the mechanism of the fabric motor 6 having a mechanism for horizontal movement of the rack, and a presser foot assembly. The mechanism of horizontal movement of the rack has the following device.

A three-center cam 29 is fixed on the main shaft 2, which is covered by the throat of the kilk 30. Near the throat of the fork, the rocker 32 is planted on the hinge screw 31. The stone enters the groove of the wings 33. The rocker is pivotally mounted on the axis 34, and for its arbitrary rotation serves as a spring 35.

The lower head of the yoke 30 covers the axis of the rocker arm 36, which is fixed on the advance shaft 37, on which the rocker arm 38 is also fixed, which carries the lever 39 of the gear rack 40 (tissue engine).

The lever 39 is spring-loaded with a tension spring 41.

The rotational movement of the main shaft 2 and the three-center cam 29 through the yoke 30, the rocker 32 and the rocker 33 is converted into the rocking movement of the rocker arm 36 and the drive shaft 37. The rocking movement of the rocker arm 38 is converted to horizontal movements of the lever 39 together with the rail 40.

The adjustment of the pitch of the stitch, as is known, is carried out by changing the angle of inclination of the backstage groove to the horizontal plane and will be described below.

The mechanism of vertical movement of the rack has the following device

An eccentric 42 is attached to the shuttle shaft 24, to which the pusher roller 43 is mounted, mounted on the right rear shoulder of the self-adjusting lever 44.

The latter is pivotally mounted on an axis 45 fixed to the platform 46 of the machine. A roller 47 is mounted on the left rear shoulder of the lever 44, interacting with the free end of the lever 39 of the rack 40.

To lower the rack teeth below the plane of the needle plate 48 (e.g.

when darning, embroidering), it is necessary to press on the handle 49 of the lever 44 and thus turn it clockwise with respect to the axis 45. In this case, the roller 43 of the right rear shoulder of the lever 44 will come out of 5 engagement (contact) with the eccentric 42, and by means of the spring clip, consisting of a leaf spring 50 fixed in the platform 46 of the machine and a disc brazed at the rear end of the handle with 10 notches 51, the lever 44 will be locked in this position. The rail is below the plane of the needle plate.

When the handle 49 is lifted, the lever 44 will be locked in the upper position by 15 engaging the leaf spring 50 with another notch 51 on the disk.

The roller 43 will come into contact with the eccentric 42, and its constant contact will be provided by an extension spring of 41 or 41.

The rotational movement of the eccentric 42 will be converted by the lever 44 into the oscillatory movement of the gear rack 40. The lowering of the gear 25 under the needle plate is controlled by the stop screw 52, which interacts with the lever 44. When the stop screw is screwed in, the rack is raised, and when unscrewed, it is lowered, Furs - 30 bottom engine control tissue is mounted on the end wall 53 of the housing 1. The mechanism is made in the form of a gear transmission with a gear ratio of 1: 3, the bearing gear 54 which is rigidly 35 it is replicated on the main shaft 2, and the driven gear 55 is mounted loosely on the axis 34 and is provided with a cam 56 of an automatic program for moving the tissue engine. The latter is in contact with the shoulder 57 of the two-shoulder lever 58, pivotally mounted put 59, the second shoulder 60 of the lever 58 interacts with the shoulder 61 of the three-shoulder lever 62 of the articulated cam mechanism 63. The second shoulder 64 of the lever 62 45 is in contact with the cam 65 for smooth adjustment of the stitch length . The third arm 66 of the articulated cam mechanism 63 is connected via a connecting link 67 and a crank 68 to a link 33 of the horizontal rail mechanism.

At the same time, the three-arm lever 62 is kinematically connected through a two-arm lever 69, pivotally mounted on an axis 70, 55 with a cam 71 for programmatically controlling the fabric engine, made in the form of an Archimedes spiral 72, into which the roller 73 of the two-arm lever 69 enters. The cam 65 has a smooth adjustment of the stitch length and cam 71

for programmatically controlling the fabric engine, as well as the gear wheel 74 of the index 75 of the stitch length, are rigidly connected to the handle 76 of the fabric engine control mechanism and together with the latter are freely mounted on an axis 77 fixed to the end wall machine body. The gear wheel 74 is meshed with a gear rack 78 carrying a stitch length indicator 75 that is moved in a vertical groove of the machine body along a panel 79 on which a scale 80 with numbers 4 is applied; 3; 2; 1; 0; 1; 2 and the letter A. The numbers indicate the size of the stitch in millimeters, and the letter A indicates when combining it with the risk on the machine body that the cam 56 of the automatic program for moving the tissue engine of the tissue engine control mechanism is in operation. The latter controls the tissue engine in a forward-forward-reverse manner. In this case, the stitch length is selected equal to 2.5 mm.

A description of the work will be given below.

The zigzag mechanism with the copy unit 5 has handles 81. 82, 83, respectively, switching the stitch selection, adjusting the zigzag width and left-right shift.

The block of copiers receives rotation from the worm gear 84, which, through a puller in contact with one of the copiers (not shown), is converted into the oscillatory movement of the output link 85. which is in contact with the horizontal arm 16.

Two scales of stitch types are placed on the machine’s body: scale 86 — types of stitches received from the copier block, scale — types of stitches obtained when the zigzag mechanism of the copier block and the cam of the automatic program for moving the fabric motor work together,

The mechanism of the presser foot 8 has a hinged presser foot 88 mounted on the shaft 89. The shaft passes through the outer guide of the sleeve and in the hole of the screw 90. A holder 91 is attached to the shaft. A spiral spring 92 is attached between the screws 90 and the holder 91. A lever is attached to the spring 92. A lever is attached to the side. 93 in contact with a holder 91 for manually raising the presser foot.

The device 9 for winding the thread on the shuttle spool 94 comprises a two-arm spring-loaded spring 96 torsion spring 96 lever 97, which at the upper end carries the probe 98, interacting with winding the thread, and at the lower end of the wedge 99. interacting with KONICHRSKAYA surface 100 two-flange bushings 101 to disconnect it. The sleeve 101 is spring-loaded with a spring 102 and mounted from the lower end of the shaft 103 to move along it. At the upper end, the shaft carries spool 94.

The lower flange 104 of the sleeve in the engaged position interacts with the V-belt 105 kinematically connected to the electric motor 106. To transmit torque to the shaft 103 in the upper part, the sleeve is provided with a hole in which a latch 107 is attached to the shaft.

A device for winding thread on a shuttle spool of a sewing machine operates as follows. The spool is pulled onto the shaft 103 so that it locks onto a protrusion (not shown) from rotation. Then, by turning the lever 97, the probe 98 is brought in to interact with the bobbin thread, and the wedge 99 in this case comes out of contact with the conical surface 100 of the sleeve 101, and the spring 102 brings the sleeve into contact with the V-belt 105. During winding of the thread, the probe 98 is in constant contact with the thread under the influence of the spring 96. As the diameter of the winding increases, the probe 98 rotates counterclockwise, overcoming the force of the spring 96, while the moment created by the spring decreases to zero% 1 reverses its sign. As a result, the wedge 99 comes into contact with the conical surface 100 of the sleeve, lifts it upward from the belt, and the rotation of the shaft 103 stops.

Sewing machine zigzag works as follows.

From the electric motor 106, the V-belt 105 rotates the main shaft 2 with the associated needle-guide mechanisms 3, the shuttle 4, the winder 7, the tissue engine 6 and the worm gear 84, the needle bar mechanism 3 provides reciprocating movement to the needle 14.

By means of the worm gear 84, the rotation is transmitted to the copy unit, the copy profiles of which determine the swing amplitude of the lever 16, and therefore the needle bar frame 12 together with the needle 14. A selected stitch, pattern or the like is obtained.

Horizontal movements of the rail 40 are provided through the fork 30, the rocker 32 and the rocker 33, which transform the rotational movements of the main shaft 2 and the three-center cam 29 into the rocking movement of the rocker arm 36 and the progression shaft 37. Changing the pitch is done by changing the angle of inclination of the groove of the rocker 33 to horizontal plane.

This is achieved by turning the handle 76 of the tissue engine control mechanism. When the knob is turned clockwise, the cam 65 smoothly controls the length of the stitch through the three-arm lever 62 of the articulated cam mechanism G3, the link 67 and the crank 68 will turn the link 33 clockwise about its axis. The angle of inclination of the backstage groove to the horizontal will increase, and hence the stitch pitch will also increase. When turning the knob counterclockwise, the stitch pitch decreases.

To move the material in the opposite direction (towards the working one), turn the handle counterclockwise.

In this case, the articulated link mechanism 63 will rotate the yoke 33 clockwise so that the front shoulder of its groove tilts below the horizontal and the rail will move the material in the opposite direction. The value of the step of the line shows the pointer 75 on a scale of 80.

To obtain any stitch depicted on a scale of 87 kinds of stitch, i.e. . of stitches obtained with the participation of the fabric engine control mechanism, it is necessary to turn the knob 76 of the engine control mechanism counterclockwise until the pointer 75 of the stitch length with the letter A is displaced. In this case, the lever 71 for programmatically controlling the fabric engine through the two-arm lever 69 will turn on the axis 59, a lever 58, the shoulder 57 of which will come into contact with the cam 56 of the avnematic program for moving the tissue engine, which constantly rotates together with the driven gear 55 of the axis 34.

At the same time, the second shoulder 60 of the lever 58 will divert the shoulder 64 of the three-armed lever 62 from the cam 65 for smoothly adjusting the stitch length and thus open the kinematic connection: cam 65 for smoothly adjusting the stitch length - three-arm lever 62 - connecting link 67 - crank 68 with the link 33.

In this case, the movement of the gear rack 40 will be carried out on command from the cam 56 of the automatic program for moving the tissue engine and kinematic communication with the link 33 is provided by the following elements1 drive gear 54 - driven gear 55 with the cam 56 of the automatic program for moving the tissue engine - two-arm lever 58 - a three-arm lever 62 - a connecting link 67 - a crank 68 attached to the link 33. As a result, the latter will rotate in such a way that the toothed rack will move according to the pattern; forward-forward-nzzad. In this case, each movement of the rail is carried out by 2.5 mm, it is precisely this pitch of the stitch that is laid on the cam of the automatic material transfer program.

zag can be combined with an automatic promotion program.

The proposed machine design is less labor-consuming to manufacture an unprofitable prototype and, in addition, due to the free access to the nodes of the tissue engine control mechanism, it is more convenient to set up and adjust.

Automatic transfer program-10 (56) 1. The USSR copyright certificate or tissue engine can be included in room No. 859500, cl. D 05 V 3/02. bom position of the handle 81 switching 2. Copyright certificate of the USSR

line selection, as any zig program- N ° 1089189, cl. D 05 V 3/02. 1981.

Claims (3)

1. ZIGZAG SEWING MACHINE, containing needle bar, shuttle and night shaft mechanisms mounted in the case and kinematically connected with the main one, zigzag mechanism with copy unit, connected to the needle bar deflection frame, row selection knob, control of a fabric engine control mechanism removed from a cam, a fabric engine control mechanism having a handle, an axis for which a cam for programmatically controlling the fabric engine and a cam for continuously adjusting the stitch length is mounted connected with a fabric motor mechanism having vertical and horizontal mechanisms for moving the fabric engine with a device for adjusting the stitch length and with a link, a device for winding thread on a shuttle spool and a drive, characterized in that the fabric engine control mechanism is mounted on an end wall of the machine body and has a gear, on the driven gear of which the cam of the automatic program is fixed movement of the tissue engine, interacting with one end of the two-shouldered rye 3 4 twenty 25 15 a step and a three-arm lever kinematically coupled simultaneously with a cam for programmatically controlling the tissue engine and the rocker of the horizontal engine of the tissue engine and interacting with the other end of the two-shouldered lever, the pinion gear being rigidly fixed to the main shaft and the follower freely mounted on the countershaft. 2. The machine according to claim 1, characterized in that; that the mechanism of vertical movement of the tissue engine has an eccentric fixed to the shuttle shaft, a self-locking lever, an axis pivotally mounted on it 30, one end of which interacts with the free end of the spring-loaded gear rack lever, and the other with the eccentric. "with 3. The machine according to claim 1, revealing that the device for winding the thread on the shuttle spool is made in the form of a spring-loaded two-flange sleeve interacting with the drive belt and Q carrying a rod under the bobbin, and a spring-loaded two-arm lever, one of which in the working position interacts with the thread wound on the bobbin, and the other in the inoperative position with the flange 5 than the sleeve. encore 90 25 / V77 t / Figg about g With oh oh sch Fie. 4 Fig 5