CN115750702A - Tabouret driving belt mechanism convenient for belt tensioning and embroidery machine - Google Patents

Abstract

The invention discloses an embroidery frame driving belt mechanism convenient for belt tensioning and an embroidery machine, wherein the embroidery frame driving belt mechanism comprises a driving support, the front end of the driving support is provided with a driving belt wheel, the rear end of the driving support is provided with a driven belt wheel, the driving belt wheel and the driven belt wheel are connected with a driving belt, the rear end of the driving support is provided with a belt tensioning device, the belt tensioning device comprises a belt wheel seat used for installing the driven belt wheel and an adjusting seat connected with the belt wheel seat, the belt wheel seat is in threaded connection with an adjusting screw rod, and the front end of the adjusting screw rod is propped against a propping member; the adjusting seat is provided with a locking portion capable of deforming, the adjusting seat is connected with a locking screw, the front end of the locking screw is in threaded connection with a locking block, the locking screw drives the locking block to move, the locking portion is driven by the locking block to deform, and the locking portion and the driving support are locked and fixed. The invention can carry out locking or unlocking operation only by one locking screw rod, simplifies the operation, can carry out operation at the rear side of the driving bracket and is convenient to operate.

Description

Tabouret driving belt mechanism convenient for belt tensioning and embroidery machine

[ technical field ] A

The invention belongs to the technical field of embroidery equipment, and particularly relates to an embroidery frame driving mechanism of an embroidery machine.

[ background of the invention ]

When the embroidery machine works, the embroidery frame needs to do reciprocating movement in the X-axis and Y-axis directions of the working plane, and the patterns of the embroidery are obtained by the movement of the embroidery frame along the X-axis and Y-axis directions. The tabouret driving mechanism drives the tabouret to realize the movement of the tabouret in the X-axis and Y-axis directions.

The existing tabouret driving mechanism comprises a driving support and a driving shaft, wherein a driving belt wheel is installed at the front end of the driving support, a driven belt wheel is installed at the rear end of the driving support, the driving belt wheel is connected with the driving shaft, the driving belt wheel and the driven belt wheel are connected with a driving belt, the driving belt is connected with a driving pulley, and the driving pulley is connected with a tabouret.

In order to realize the tensioning of the driving belt, the belt wheel seat of the driven belt wheel is installed and is connected with the driving support in a sliding mode in the front and back mode, the bottom wall of the driving support is provided with a locking screw, the locking screw is loosened, the belt wheel seat can slide in the front and back mode, and the locking screw and the belt wheel seat are tightly pressed against each other to realize the locking of the belt wheel seat.

The belt tensioning arrangements of the prior art suffer from the disadvantage that adjustment is not convenient enough because the space between the drive support and the ground is limited and the workers need to drill under the machine to operate. In addition, in order to ensure reliable locking, a plurality of locking screws are usually required to be arranged, and the operation is complex.

[ summary of the invention ]

Aiming at the defects in the prior art, the invention aims to provide an tabouret driving belt mechanism convenient for belt tensioning.

In order to solve the technical problems, the invention adopts the following technical scheme: an embroidery frame driving belt mechanism facilitating belt tensioning comprises a driving support, wherein a driving belt wheel is mounted at the front end of the driving support, a driven belt wheel is mounted at the rear end of the driving support, the driving belt wheel and the driven belt wheel are connected with a driving belt, a belt tensioning device for adjusting the front and rear positions of the driven belt wheel to tension the driving belt is arranged at the rear end of the driving support, the belt tensioning device comprises a belt wheel seat for mounting the driven belt wheel and an adjusting seat connected with the belt wheel seat, the belt wheel seat is in threaded connection with an adjusting screw rod, and the front end of the adjusting screw rod is abutted to a jacking piece; the adjusting seat is provided with a locking portion capable of deforming, the locking portion is movably connected with the driving support, the driving support is provided with a movable positioning structure for positioning the locking portion, the adjusting seat is connected with a locking screw, the locking screw extends forwards and backwards, the rear end of the locking screw is provided with an operation portion, the rear portion of the adjusting seat is provided with a screw matching portion matched with the operation portion, the front end of the locking screw is in threaded connection with a locking block, the locking screw drives the locking block to move, the locking block is driven by the locking block to deform, and the locking portion is locked and fixed with the driving support.

Preferably, the locking portion is for locating the anterior locking arm that just controls and set up side by side of adjustment seat, locking arm activity inserts in the drive support, be equipped with the locking fitting surface between locking arm and the drive support inside wall, the left and right sides face of latch segment corresponds and is equipped with scarf cooperation structure between the locking arm of both sides.

Preferably, the movable positioning structure comprises an upper positioning surface which is arranged in the driving support and used for positioning the upper surface of the locking arm, and a lower positioning surface which is used for positioning the lower surface of the locking arm.

Preferably, the front side of the locking block is provided with a guide pin which is in guide fit with the driving bracket.

Preferably, the locking arm is provided with an upper limiting rib protruding inwards, and the upper limiting rib is in limiting fit with the upper surface of the locking block.

Preferably, the top surface of the adjusting seat is provided with a positioning part, the bottom of the pulley seat is positioned at the positioning part, and the pulley seat is fixed on the adjusting seat by adopting a pulley seat fixing screw.

Preferably, the screw fitting portion includes a concave portion formed at a position of the rear end of the adjusting seat corresponding to the locking screw, a supporting convex surface for supporting the locking screw when the locking block is tightened is formed in the concave portion, and a supporting piece for supporting the locking screw when the locking block is loosened is formed at the rear side of the concave portion.

Preferably, a boss is arranged in the middle of the inner bottom wall of the driving support, and the two locking arms are correspondingly positioned on the left side and the right side of the boss; the middle of the bottom of the driving support is provided with a groove which is through from front to back, and the boss is provided with a through groove which is through the bottom surface of the driving support downwards corresponding to the locking block.

Preferably, the top tight piece is for installing in the first locating lever of drive support, be equipped with on the first locating lever with adjusting screw's front end top connect the tight face in complex top, and first locating lever is used for pressfitting locking arm downwards.

The invention also provides an embroidery machine which is provided with the tabouret driving belt mechanism convenient for belt tensioning.

The technical scheme of the invention has the following beneficial effects:

1. belt pulley seat threaded connection has adjusting screw, and adjusting screw's front end top connects the holding-up piece, rotates adjusting screw, and adjusting screw can front and back rectilinear movement, when adjusting screw moved forward with the belt pulley seat relatively, because adjusting screw's front end top connects the holding-up piece, can't move forward, and the belt pulley seat can't rotate simultaneously, can push the belt pulley seat and move backward under the screw-thread fit effect to make from the driven pulleys will drive the belt tensioning.

The belt wheel seat is connected with the adjusting seat, the adjusting seat is connected with a locking screw, the locking screw is in threaded connection with a locking block, and a locking portion is movably connected with the driving support, so that the front and back positions of the adjusting seat can be adjusted by the driving support relatively, when the adjusting seat needs to be locked, the locking screw drives the locking block to move, the locking block drives the locking portion to deform in the moving process, and the locking portion is locked and fixed with the driving support.

Therefore, on one hand, only one locking screw rod is needed to carry out locking or unlocking operation, and the operation is simplified.

In addition, on the one hand, the locking screw rod extends forwards and backwards, and the rear end of the locking screw rod is provided with the operating part, so that the locking screw rod can be operated at the rear side of the driving support, and the operation is convenient.

Because the driving support is provided with the movable positioning structure for positioning the locking part, even if the position of the adjusting seat is changed from front to back, other directions are still limited, and the tensioning adjusting effect is stable and reliable.

2. When the locking block moves backwards relative to the locking arms, the two locking arms are outwards opened through the wedge surface matching structure, and the locking arms are tightly propped against the inner side wall of the driving support, so that the locking is reliable.

When the locking is released, the locking screw rotates anticlockwise, the locking block moves forwards relative to the locking arms, the two locking arms contract inwards and return to a natural state, and finally the locking is released between the locking arms and the inner side wall of the driving support, and the adjusting seat can slide forwards and backwards to drive the belt wheel seat to slide forwards and backwards.

3. The upper positioning surface and the lower positioning surface are matched to limit the freedom degree of the locking arm in the vertical direction. Therefore, the locking arms can only slide back and forth but can not move up and down, after the side faces of the two locking arms are correspondingly locked with the inner side walls of the left side and the right side of the driving support, the freedom degrees of the locking arms in all directions are limited, the belt wheel seat cannot be loosened in any direction, the driving tensioning effect is guaranteed, the driving precision is improved, and the stability and the reliability of the embroidery frame driving are guaranteed.

4. Two guide pins are arranged on the front side of the locking block side by side and correspondingly matched with the left side and the right side of the upper layer groove of the groove in a guiding manner, so that the locking block is limited to swing left and right and up and down in the horizontal direction. Meanwhile, the locking arm is provided with an upper limiting rib protruding inwards and is in limiting fit with the upper surface of the locking block, so that the locking block can be limited to move forwards and backwards only, and can not move basically in other directions, and the wedge surface matching structure is guaranteed to play a role reliably.

5. The supporting convex surface is used as a supporting surface when the locking block is fastened, and when the locking block is fastened, the head of the hexagon socket head screw at the rear end of the locking screw is tightly matched with the supporting convex surface in a propping manner to drive the locking block to move backwards; the support piece is used as a support when the locking block is loosened, and when the locking block is loosened, the head of the hexagon socket head screw at the rear end of the locking screw is tightly matched with the support piece in a propping manner to drive the locking block to move forwards.

6. First locating lever can pass drive support and fixed along left and right directions, on the one hand, is equipped with on the first locating lever and connects the complex tight face of top with adjusting screw's front end top, and on the other hand, can also push down locking arm.

These features and advantages of the present invention will be disclosed in more detail in the following detailed description and the accompanying drawings.

[ description of the drawings ]

The invention is further described with reference to the accompanying drawings in which:

FIG. 1 is a schematic view of the relative positions of a drive shaft and a lower shaft of the prior art;

FIG. 2 is a schematic view of the relative positions of the drive shaft and the lower shaft of the present invention;

FIG. 3 is a schematic view of the arrangement of the tabouret driving mechanism and the lower shaft of the present invention;

FIG. 4 is a relative height schematic view of the drive shaft and tensioning pulley;

FIG. 5 is a schematic view showing the construction of an embroidery frame driving mechanism according to the present invention;

FIG. 6 is an exploded view of the embroidery frame driving mechanism according to the present invention;

FIG. 7 is a schematic illustration of the installation of the belt tensioner of the present invention;

FIG. 8 is a schematic illustration of the belt tensioner separated from the drive bracket;

FIG. 9 is an enlarged schematic view at A in FIG. 8;

FIG. 10 is an exploded view of the belt tensioner;

FIG. 11 is a schematic view of the belt tensioner after separation from the drive bracket;

FIG. 12 is a schematic view of the combination of the belt tensioner and the drive bracket;

FIG. 13 is a bottom view of the belt tensioner;

reference numerals are as follows: tabouret driving mechanism 1, driving shaft 11, gear box 12, hoop 121, driving motor 13, driving bracket 14, boss 1401, groove 1402, lower positioning surface 1403, inner rib 1404, t-shaped groove 1405, lateral through hole 1406, through groove 1407, pulley guide rail 141, driving pulley 142, first positioning rod 143, tightening surface 1431, second positioning rod 144, driving belt 15, driving pulley 16, driven pulley assembly 17, pulley holder 171, pulley holder fixing screw 172, adjusting screw 173, driven pulley 174, bearing holder 18, tensioning pulley 181, pulley holder locking assembly 19, adjusting holder 191, positioning portion 1911, vertical threaded hole 1912, concave portion 1913, support convex surface 1914, guide hole 1915, rear screw hole 1916, locking block 192, locking block threaded hole 1921, second wedge 1922, guide pin 1923, locking screw, support sheet 194, wrench through hole 1941, support sheet fixing screw 2, locking arm 195, first wedge face wedge 1951, upper limiting rib 1952, lower shaft box 19421.

[ detailed description ] embodiments

The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the embodiments described below are only preferred embodiments of the present invention, and not all of them. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.

It will be appreciated by those skilled in the art that features from the examples and embodiments described below may be combined with each other without conflict.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Words such as "upper," "lower," "front," "rear," "left," "right," and the like, which indicate orientation or positional relationship, are based only on the orientation or positional relationship shown in the drawings, are merely for convenience in describing the present invention and to simplify the description, and do not indicate or imply that the referenced devices/elements must have a particular orientation or be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present invention.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature "on," "above" and "over" the second feature may include the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature.

Referring to fig. 2 to 6, the embroidery frame driving assembly with smooth driving comprises an embroidery frame driving mechanism 1, wherein the embroidery frame driving mechanism 1 comprises a driving support 14, a gear box 12, a driving shaft 11 connected with the gear box and a driving motor 13, a driving pulley 16 is installed at the front end of the driving support 14, a driven pulley 174 is installed at the rear end of the driving support 14, the driving pulley 16 is connected with the driving shaft 11, and the driving pulley 16 and the driven pulley 174 are connected with a driving belt 15.

The driving belt 15 is connected with a driving pulley 142, the driving pulley 142 is connected with the embroidery frame, and a pulley guide rail 141 arranged on the driving bracket is connected with the driving pulley 142 in a sliding manner.

In order to increase the strength and rigidity of the driving shaft and to make the transmission of the driving more stable, the diameter of the driving shaft 11 is more than or equal to 30mm. The maximum is 26mm in the prior art, so the diameter is increased compared with the prior art, and after the diameter is increased, a hollow shaft is adopted for the driving shaft 11 aiming at the condition that the self weight of the driving shaft is overlarge, thereby reducing the weight and saving the materials.

Referring to the prior art, a lower shaft 21 is provided at the rear side of the driving shaft 11 perpendicular to the driving shaft, and is mounted to the lower shaft transmission case 2. When the diameter of the driving shaft is increased and the lower shaft is pulled forward, the driving shaft interferes with the lower shaft, and therefore, the driving shaft 11 is designed to be lower than the lower shaft 21.

Since the height of the driving part of the driving belt, i.e., the part connected to the driving block, cannot be lowered, after the driving shaft 11 is lowered, in order to ensure that the height of the driving part of the driving belt remains unchanged, a tension pulley 181 is provided at the rear side of the driving pulley, and the center of the driving shaft 11 is lower than the center of the tension pulley 181, which also has the function of tensioning the driving belt.

As shown in FIG. 4, the height of the center of the driving shaft 11 below the center of the tension pulley 181 is H, H ≧ 3mm, such as 5mm, which is adjusted according to the diameter change of the driving shaft.

Further, bearing seats 18 are installed on both left and right sides of the front end of the driving bracket 14, and not only the driving shaft 11 is rotatably supported on the bearing seats 18 through bearings, but also the pulley shaft of the tension pulley 181 is installed on the bearing seats through bearings.

The gear box 12 is provided with a first gear shaft and a second gear shaft, the first gear shaft is provided with a first gear, the second gear shaft is provided with a second gear, and the first gear and the second gear are in meshing transmission. The diameter of the first gear is larger than that of the second gear, and the first gear shaft is in coupling transmission with the driving shaft 11. The second gear shaft is connected to an output shaft of the drive motor 13.

Specifically, the transmission ratio between the first gear and the second gear is 1, and the adjustment can be made according to the diameter change of the driving shaft, so as to ensure that the original proportional relation between the speed of the driving motor and the speed of the driving belt is unchanged, and of course, other values can also be adopted. The first gear shaft is connected with the driving shaft through a hoop 121. Compared with the radial locking by adopting a locking screw, the locking mechanism is more stable and reliable.

Referring to the prior art, two ends of the first gear shaft are correspondingly supported on two eccentric bearings, an angle adjusting structure is arranged between an outer ring of each eccentric bearing and the gear box, and the outer rings of the two eccentric bearings are adjusted by the angle adjusting structure to rotate by the same angle, so that the first gear shaft moves radially, and the gap between the first gear and the second gear is adjusted.

The gear box is composed of a box body and a box cover. One of the two eccentric bearings is mounted on the box body, and the other eccentric bearing is mounted on the box cover.

As an embodiment, the angle adjusting structure comprises a plurality of adjusting threaded holes which are circumferentially and uniformly distributed on the gear box along the shaft hole of the first gear shaft, the outer ring of the eccentric bearing is provided with a fixed hole, the fixed hole is connected with an adjusting screw, and the adjusting screw is in threaded fit with the adjusting threaded holes. After the adjusting screw is unscrewed, the eccentric bearing can be adjusted in a rotating mode, and after the adjusting screw is adjusted in place, the adjusting screw is screwed again, and the position is fixed. The angle adjusting structure can be operated outside the gear box, the gear box does not need to be disassembled, and therefore the structure is adjusted in a staggered mode, and operation is greatly simplified.

In addition, the outer ring of the eccentric bearing is integrally connected with a flange, and the fixing hole is formed in the flange. The shaft hole of the first gear shaft is a stepped hole which comprises an inner end stepped surface and an outer port stepped surface. One end of the eccentric bearing is supported on the inner end step surface, the flange plate arranged at the other end is supported on the outer port step surface, and correspondingly, the adjusting threaded hole is formed in the outer port step surface.

In this embodiment, three fixed orificess of equipartition on the ring flange, and on outer port step face, set up 12 regulation screw holes, two adjacent intervals of adjusting the screw hole are 30 degrees, consequently adjust at least can rotate 30 degrees at every turn. Of course, the number and the spacing angle of the fixing holes and the adjusting threaded holes are not limited to those of the embodiment.

Because the synchronous equidirectional adjustment of the eccentric bearings at the two ends needs to be ensured, in order to avoid errors of the adjustment direction and the adjustment position, the outer side surface of the flange plate is provided with a reference mark for observing the circumferential relative position of the eccentric bearings. The reference mark may be a reference hole. Because the flange plate is evenly provided with three fixing holes, two reference holes are arranged, and the two reference holes are correspondingly arranged on two sides of one fixing hole, so that the position of the fixing hole can be used as a reference, for example, after the fixing hole is adjusted to be upward, the positions of the fixing holes on the eccentric bearings at two ends are both upward, and the correction is only realized.

It will be appreciated that the first and second gears are cylindrical gears as is conventional.

As shown in fig. 7 to 13, in order to achieve tension adjustment of the drive belt, the rear end of the driving bracket 14 is provided with a belt tensioner for adjusting the forward and backward positions of the driven pulley 174 to tension the drive belt 15.

The belt tensioner comprises a driven pulley assembly 17, the driven pulley assembly 17 comprising the driven pulley 174, a pulley holder 171 for mounting the driven pulley, the pulley holder being movable back and forth along the drive carrier 14. The pulley seat 171 is threadedly connected with an adjusting screw 173, the adjusting screw 173 extends forwards and backwards and penetrates through the pulley seat 171, and the front end of the adjusting screw 173 abuts against a tightening piece which can be fixed in the driving bracket. The rear end of the adjustment screw 173 may be provided with a socket head to facilitate rotation of the adjustment screw by a socket wrench. Thus, turning the adjustment screw 173, the adjustment screw may move linearly back and forth relative to the pulley block. When the adjustment screw 173 moves forward relative to the pulley block, the front end of the adjustment screw abuts against the abutment member, and cannot move further, and the pulley block cannot rotate, and the pulley block is pushed to move backward by the screw engagement, so that the driven pulley 174 tensions the drive belt 15.

In one embodiment, the fastening member is a first positioning rod 143 mounted on the driving bracket 14, and a fastening surface 1431 is provided on the first positioning rod 143 to engage with a front end of the adjusting screw 173.

In order to maintain the position of the pulley seat 171 after the pulley seat 171 is moved and the drive belt 15 is tensioned, the belt tensioner is provided with a pulley seat locking assembly 19. The pulley seat locking assembly 19 comprises an adjusting seat 191 connected with the pulley seat 171, and the adjusting seat 191 moves together with the pulley seat 171 and is locked and fixed after the position of the pulley seat 171 is adjusted. Specifically, the adjusting seat 191 is provided with a deformable locking portion, the adjusting seat 191 is connected with a locking screw 193, the locking screw 193 is in threaded connection with a locking block 192, and the locking block 192 is correspondingly provided with a locking block threaded hole 1921 and connected with the locking screw 193. The locking screw 193 drives the locking block 192 to move, and the locking block 192 drives the locking part to deform in the moving process so as to lock and fix the locking part and the driving bracket 14.

In one embodiment, the locking portion is a locking arm 195 disposed at the front of the adjusting seat 191 and arranged side by side, and the locking arm 195 and the adjusting seat 19 are integrally formed, and may be made of metal, such as alloy steel, and may ensure sufficient strength and deformation. The locking arm 195 is inserted into the inner side of the rear end of the driving support in a sliding mode, a locking matching surface is arranged between the locking arm 195 and the inner side wall of the driving support, and locking is achieved after the locking arm and the inner side wall of the driving support are tightly propped. Wedge surface matching structures are arranged between the left side surface and the right side surface of the locking block 192 and the locking arms 195 on the two sides correspondingly, specifically a first wedge surface 1951 arranged on the locking arm and a second wedge surface 1922 arranged on the side surface of the locking block. Taking the locking screw 193 as an example of clockwise rotation for locking, when the locking block 192 moves backwards relative to the locking arm 195, the two locking arms are opened outwards through the wedge surface matching structure, and the locking arms are tightly pressed against the left and right inner side walls of the driving bracket. When the locking is released, the locking screw 193 rotates anticlockwise, the locking block 192 moves forwards relative to the locking arms 195, the two locking arms 195 contract inwards and return to a natural state, and finally the locking between the locking arms 195 and the inner side wall of the driving support is released, and the adjusting seat 191 can slide forwards and backwards to drive the belt wheel seat 171 to slide forwards and backwards.

After the locking arm is locked, the degree of freedom in the left-right direction is limited, in order to guide the adjusting seat 191 to slide back and forth along the driving bracket 14 when the pulley seat 171 is adjusted, and at the same time, after the locking arm 195 is locked, the degree of freedom in the up-down direction of the locking arm is limited, thereby positioning the locking arm in all directions. An upper positioning surface for positioning the upper surface of the locking arm and a lower positioning surface 1403 for positioning the lower surface of the locking arm are arranged in the driving support 14. The lower positioning surface 1403 is an inner bottom wall of the driving support, inner convex ribs 1404 are arranged on inner side walls of the left side and the right side of the driving support, the upper positioning surface is a bottom surface of the inner convex ribs, and the upper positioning surface and the lower positioning surface are matched to limit the freedom degree of the locking arm in the vertical direction. Therefore, the locking arms can only slide back and forth but cannot move up and down and rotate, after the side surfaces of the two locking arms are correspondingly locked with the inner side walls of the left side and the right side of the driving support, the freedom degrees of the locking arms in all directions are limited, the belt wheel seat cannot loosen in any direction, the driving tensioning effect is guaranteed, the driving precision is improved, and the stability and the reliability of the embroidery frame driving are guaranteed.

Further, the positioning effect of the locking arm can be enhanced, and the first positioning rod 143 can be passed through the driving bracket 14 in the left-right direction and fixed while pressing the locking arm 195 downward. It will be appreciated that the lowest point of the first locating lever 143 is located substantially flush with the upper locating surface and therefore also has a restraining effect on the locking arm. Therefore, the first positioning rod 143 can be used as an adjustment reference of the pulley seat 171, and can also press the locking arm 195 to prevent the vertical swing thereof. In addition, a second positioning rod 144 can be arranged side by side, so that the locking arm can be more stably and reliably pressed. The first positioning rod 143 and the second positioning rod 144 may be both screw rods. In order to install the first positioning rod and the second positioning rod, a T-shaped groove 1405 is arranged in the middle position of the height of the outer sides of the left side wall and the right side wall of the driving support, a lateral through hole 1406 matched with the first positioning rod and the second positioning rod is arranged in the T-shaped groove 1405, an inner hexagon screw head at one end of the screw rod is arranged in the T-shaped groove, a nut connected with the other end of the screw rod is also arranged in the T-shaped groove, and the first positioning rod and the second positioning rod can be fixed by screwing the inner hexagon screw head.

Therefore, through the technical scheme, the degree of freedom of all directions of the locking arm is limited by multiple and reliable degrees, the possible looseness of all directions of the belt wheel seat is prevented, and the tensioning adjusting effect is stable and reliable.

As shown in fig. 9, a boss 1401 is provided in the middle of the inner bottom wall of the driving bracket, and two locking arms 195 are correspondingly provided at the left and right sides of the boss. The middle of the bottom of the driving support 14 is provided with a groove 1402 which is through from front to back, the groove comprises an upper groove with the upper part positioned in the boss and a lower groove with the lower part downward through the bottom surface of the driving support, and the width of the upper groove is larger than that of the lower groove, and is similar to a T-shaped structure.

In order to install the locking block 192 and form a fit with the locking arm 195, the boss 1401 is provided with a through groove 1407 which penetrates downwards the bottom surface of the driving bracket corresponding to the locking block 192, and the locking block 192 can move back and forth in the through groove 1407. And, the locking screw 193 penetrates into the groove 1402 to be connected with the locking block 192.

Further, to avoid the swinging and deflection of the locking block, the front and back linear movement is maintained. On one hand, two guide pins 1923 are arranged in parallel on the front side of the locking block 192, and the two guide pins 1923 are correspondingly and guided to be engaged with the left and right side portions of the upper groove of the groove 1402, so as to limit the locking block from swinging horizontally and vertically. On the other hand, the locking arm 195 is provided with an upper limiting rib 1952 protruding inwards to be in limiting fit with the upper surface of the locking block 192.

The pulley seat 171 is connected with the adjusting seat 191 and fixed together, as shown in fig. 10, the top surface of the adjusting seat 191 is provided with a positioning part 1911 which is matched with the structure of the bottom of the pulley seat, and the bottom of the pulley seat is positioned at the positioning part 1911. Because the bottom surface of the pulley seat and the top surface of the adjusting seat are rectangular surfaces, the positioning part can be positioning ribs arranged on the front side and the rear side of the top surface of the adjusting seat, then vertical threaded holes 1912 are correspondingly arranged near the four corners of the top surface of the adjusting seat, the pulley seat is connected with pulley seat fixing screws 172, and the pulley seat fixing screws 172 are screwed downwards into the vertical threaded holes 192, so that the pulley seat 171 and the adjusting seat 191 are fixed together.

In order to operate the locking screw, the locking screw extends forwards and backwards, an operating part is arranged at the rear end of the locking screw, specifically, a hexagon socket head screw head is adopted, a screw matching part matched with the operating part is arranged at the rear part of the adjusting seat, specifically, a concave part 1913 is arranged at the rear end of the adjusting seat 191, a supporting convex surface 1914 is arranged in the concave part 1913, the front end of a guide hole 1915 penetrates through the supporting convex surface 1914, and the locking screw 193 movably penetrates through the guide hole 1915 and then is in threaded connection with the locking block 192. The convex support surface 1914 serves as a support surface for the locking block, and when the locking block is locked, the head of the hexagon socket head screw at the rear end of the locking screw 193 is tightly engaged with the convex support surface 1914 to drive the locking block 192 to move backward.

Furthermore, a support plate 194 is disposed at the rear side of the concave portion 1913, support plate fixing screws 1942 are connected to the left and right sides of the support plate, rear screw holes 1916 are disposed at the left and right sides of the concave portion 1913 at the rear end of the adjustment seat, and are connected to the support plate fixing screws 1942, so that the support plate 194 is fixed to the adjustment seat 191. The middle of the support piece is provided with a wrench through hole 1941, and a wrench or other tools pass through the wrench through hole 1941 to be connected with the hexagon socket head screw at the rear end of the locking screw 193. The backup plate 194 serves as a support for loosening the locking block, and when the locking block is loosened, the hexagon socket head at the rear end of the locking screw 193 is brought into tight engagement with the backup plate 194 to drive the locking block 192 to move forward. The wrench through hole 1941 allows passage of a wrench, but is smaller than the hexagon socket head.

It will be appreciated that the above-described tabouret drive assembly, as well as the tabouret drive mechanism, belt tensioner, or any other configuration or combination thereof, may be used in part or in whole on an embroidery machine.

While the foregoing is directed to embodiments of the present invention, the scope of the present invention is not limited thereto, and it will be appreciated by those skilled in the art that the present invention includes, but is not limited to, those illustrated in the drawings and described in the foregoing detailed description. Any modification which does not depart from the functional and structural principles of the invention is intended to be included within the scope of the claims.

Claims (10)

1. An embroidery frame driving belt mechanism facilitating belt tensioning comprises a driving support, wherein a driving belt wheel is mounted at the front end of the driving support, a driven belt wheel is mounted at the rear end of the driving support, the driving belt wheel and the driven belt wheel are connected with a driving belt, and a belt tensioning device for adjusting the front and rear positions of the driven belt wheel to tension the driving belt is arranged at the rear end of the driving support; the adjusting seat is provided with a locking part capable of deforming, the locking part is movably connected with the driving support, the driving support is provided with a movable positioning structure for positioning the locking part, the adjusting seat is connected with a locking screw, the front end and the rear end of the locking screw are provided with operation parts, the rear part of the adjusting seat is provided with a screw matching part matched with the operation parts, the front end of the locking screw is in threaded connection with a locking block, the locking screw drives the locking block to move, the locking block is driven by the locking block to deform, and the locking part is locked and fixed with the driving support.

2. The tabouret driving belt mechanism convenient for belt tensioning as claimed in claim 1, wherein the locking portion is a locking arm disposed in front of the adjusting seat and side by side, the locking arm is movably inserted into the driving bracket, a locking fitting surface is disposed between the locking arm and the inner side wall of the driving bracket, and wedge surface fitting structures are disposed between the locking arms on both sides of the locking block.

3. The tabouret drive belt mechanism of claim 2, wherein the movable positioning structure comprises an upper positioning surface disposed in the drive bracket for positioning the upper surface of the locking arm, and a lower positioning surface for positioning the lower surface of the locking arm.

4. The tabouret drive belt mechanism for facilitating belt tensioning of claim 2, wherein the front side of the locking block is provided with a guide pin for guiding engagement with the drive bracket.

5. The tabouret drive belt mechanism of claim 2, wherein the locking arm is provided with an upper limiting rib protruding inwards, and the upper limiting rib is in limiting fit with the upper surface of the locking block.

6. The tabouret driving belt mechanism convenient for belt tensioning as claimed in claim 1, wherein the top surface of the adjusting seat is provided with a positioning portion, the bottom of the pulley seat is positioned at the positioning portion, and the pulley seat is fixed on the adjusting seat by a pulley seat fixing screw.

7. The tabouret driving belt mechanism of claim 1, wherein the screw fitting portion comprises a concave portion formed at a rear end of the adjusting seat corresponding to a position of the locking screw, a convex supporting surface for supporting the locking screw when the locking block is locked is formed in the concave portion, and a supporting piece for supporting when the locking block is released is formed at a rear side of the concave portion.

8. The tabouret driving belt mechanism convenient for belt tensioning as claimed in claim 2, wherein a boss is provided in the middle of the inner bottom wall of the driving bracket, and two locking arms are correspondingly provided at the left and right sides of the boss; the middle of the bottom of the driving support is provided with a groove which is through from front to back, and the boss is provided with a through groove which is through the bottom surface of the driving support downwards corresponding to the locking block.

9. The tabouret driving belt mechanism convenient for belt tensioning as claimed in claim 2, wherein the top member is a first positioning rod mounted on the driving bracket, the first positioning rod is provided with a top surface in top fit with the front end of the adjusting screw, and the first positioning rod is used for pressing the locking arm downwards.

10. An embroidery machine characterized by being provided with an embroidery frame driving belt mechanism facilitating belt tensioning as claimed in any one of claims 1 to 9.

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