KR20070092659A - Motor driving type sewing machine - Google Patents

Abstract

A motor driving type sewing machine is provided to make the entire structure simple and compact, by disposing a driving motor adjacently to a rear wall portion of a sewing machine frame. A main shaft(4) is protruded from a sewing machine frame(1) toward the outside. A driving motor(5) is disposed at the rear of the sewing machine frame such that an output shaft(5a) is positioned in parallel with the main shaft. A motor attaching support(11) is extended from a lateral portion of the sewing machine frame in a rear direction. The motor attaching support fixes and supports the driving motor. A timing pulley(9) and a timing belt(10) interlockingly connect the output shaft of the driving motor and the main shaft at an outside position of the lateral portion of the sewing machine frame. The motor attaching support is switched between a first state and a second state by rotating around the center of upper and lower shafts(24). In the first state, the motor attaching support pulls the driving motor outside the lateral portion of the sewing machine frame. In the second state, the motor attaching support positions the driving motor at the rear of the sewing machine frame.

Description

Motor Driven Sewing Machine {MOTOR DRIVING TYPE SEWING MACHINE}

1 is a schematic perspective view of the entire motorized sewing machine according to the present invention.

2 is an enlarged exploded perspective view of a main part.

3 is an enlarged cross sectional view of a main portion showing a normal sewing use state.

4 is an enlarged cross-sectional view of an essential part showing a drive motor withdrawal state at the time of maintenance.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a motor-driven sewing machine in which a main shaft of the sewing machine is driven to rotate by an electric motor. Specifically, the motor drive is formed by interlocking a main shaft protruding outward from the sewing frame to the side and an output shaft located parallel to the main axis of the drive motor disposed at the rear of the sewing frame via a timing pulley and a timing belt. It is about food sewing machine.

As a motor-driven sewing machine of this kind, a drive motor is provided on the inner surface side of a motor mounting base that is conventionally disclosed in the Republic of China (Taiwan) Invention Publication No. 2005O6129 and detachable through a screw member on the side outer surface of the sewing machine frame. And the output shaft passes through a hole formed in the motor mount, and protrudes to the outer side of the motor mount, and the timing pulley on the motor side is fixed to the protruding output shaft through the screw member. Passes through the hole formed in the motor mounting stand to protrude to the outer surface side of the motor mounting stand, fixes the timing pulley on the passive side through the screw member to the protruding main shaft portion, and tightens the timing belt between these timing pulleys. It is known to wind and install.

In such a motor-driven sewing machine, as is clear from the publication of the Republic of China (Taiwan) Invention Publication 200506129, the drive motor does not protrude greatly outward of the side of the sewing frame, and the front and rear lengths of the sewing machine are also In order to make it as short as possible, the structure which simplifies and compacts the structure of the whole machine | machine is employ | adopted by arrange | positioning a drive motor very close to the rear wall part of a sewing machine frame immediately after a sewing machine frame.

By the way, in the sewing machine, in order to regularly inspect, adjust, and maintain the internal mechanism of the sewing machine frame, a cover which is detachable or swingable and open / close freely is provided on the rear wall or side wall of the sewing machine frame. When carrying out maintenance by attaching or detaching the cover, it is necessary to secure a wide work space at the rear part or the side part of the sewing machine frame. To this end, the drive motor, which is arranged very close to the sewing machine frame, interferes with the operation, so that only the drive motor can be detached from the motor mounting stand alone, or driven such as a drive motor, a motor mounting stand, both timing pulleys and a timing belt. It may be necessary to disassemble and remove the components of the assembly or employ one of the means.

Among them, in the case of disassembly and disassembly of the components of the latter electric assembly, the components of the electric assembly are separated one by one each time in maintenance (disassembly), and once again after maintenance, they are reattached one by one ( Assembly) requires not only very complicated and enormous operation effort, but also after assembly, the distance between the motor output shaft and the main shaft, which has been precisely adjusted on the manufacturer's side, for the quality assurance at the time of the sewing machine fluctuates delicately, As a result, the load tension on the timing belt changes, and it is impossible to stably reproduce the predetermined motor performance. In particular, when the load tension to the belt becomes excessive, there is a problem that the frictional heat acting on the belt increases so much that it adversely affects the belt life. Moreover, in the case of the means for detaching only the former drive motor from the motor mounting stand alone, the operation effort is less than in the case of the latter means, but the mounting screw must be loosened or tightened while supporting the heavy drive motor. In the case of this electronic means, too, in the case of this electronic means, after loosening the screw member by loosening the screw member of the transmission side timing pulley fixed to the motor output shaft, the drive motor is detached, and the maintenance ends. After attaching the drive motor to a predetermined position of the motor mount, it is cumbersome to fix the timing pulley by attaching the screw member to the output shaft again. Subtle fluctuations are inevitable, and due to this, the predetermined motor performance is stably reproduced There was a problem that it was difficult to eliminate adverse effects on belt life.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and the drive motor is arranged very close to the rear wall of the sewing machine frame immediately after the sewing machine frame, thereby simplifying and compacting the overall structure. It is an object of the present invention to provide a motor-driven sewing machine which can easily and efficiently withdraw a driving motor due to work labor and operation effort, and can reproduce electric performance in a stable state at all times.

In order to achieve the above object, the motor-driven sewing machine according to the present invention is a main shaft protruding outward from the sewing frame, a drive motor disposed so that the output shaft in the rear portion of the sewing frame is parallel to the main shaft, A motor attachment stage installed rearward from the side of the sewing frame on the side where the main shaft protrudes and fixedly supporting the driving motor, and timing of interlocking the output shaft of the driving motor with the main shaft at a position outside the side of the sewing frame. A motor-driven sewing machine comprising a pulley and a timing belt, comprising: a first state in which the motor mount is pulled out of the side of the sewing frame and displaced by a rotational movement around an upper and lower shaft centers; It is comprised so that switching to the 2nd state arrange | positioned and fixed in a predetermined position is possible And that is characterized.

According to the present invention having the feature configuration as described above, when maintenance is required, only the timing belt is removed, and then the drive motor is displaced by displacing the drive motor to the outside of the side of the sewing frame by rotating the motor mount around the vertical axis. By simply switching to the first state, it is possible to retract the drive motor from the position immediately after the sewing frame to secure a large work space at the rear portion of the sewing frame to facilitate and easily perform maintenance. After that, the motor mounting stage is rotated around the upper and lower shaft centers to switch to the second state in which the drive motor is disposed and fixed at a predetermined position in the rear part of the sewing machine frame, and furthermore, by putting the timing belt removed, in a normal sewing use state. It is possible to return.

Therefore, the drive motor is placed very close to the rear wall of the sewing frame immediately after the sewing frame to simplify and compact the overall sewing machine, while disassembling the components of the electric assembly one by one during maintenance and after maintenance. Excessive operation effort of assembling one by one, or unscrewing and removing timing pulley from motor output shaft during maintenance, remove from motor mount while supporting heavy driving motor, and attach them in order after maintenance It is possible to easily and efficiently evoke or return the drive motor with little labor and operation effort without requiring labor-intensive operation. In addition, since the motor mounting table can be rotated around the upper and lower shaft centers at the correct positions, the distance between the shaft of the drive shaft and the output shaft of the drive motor does not change at the time of the retirement and return. It is possible to reliably maintain a constant interaxial distance that is precisely adjusted in the back and the like, so that even after maintenance, proper and good rolling performance can be stably reproduced. In particular, it is possible to obtain an effect of preventing problems such as deterioration of electric performance and belt life due to excessive load tension on the timing belt.

In the motor-driven sewing machine according to the present invention, as described in claim 2, the motor mount is attached to the rear end of the fixed motor mount of the front part, which is detachably attached to the side outer surface of the frame. By adopting a structure that is pivotally supported so as to be switchable in two states, that is, by constructing a series of front and rear parts installed by extending the motor mount from the side outer surface of the sewing frame to the rear of the sewing frame, Without requiring improvement, such as fixing a pivotal support connection bracket, electric assemblies, such as a drive motor, a motor mounting stand, both timing pulleys, and a timing belt, are later attached to an existing sewing machine, thereby simplifying the overall structure as described above. It is possible to easily realize compactness, compactness, and easy maintenance.

Here, as described in claim 3, at the rear end of the fixed motor mount of the front part and the front end of the motor mount, male and female fitting portions that are fitted to each other from front and rear are formed, respectively, and the fitting portions of these male and female upper and lower portions are formed. It is preferable to set it as the structure by which the motor mounting stand is pivotally connected to the fixed motor mounting stand so that a rotational movement can be carried out about an up-and-down axial center through the axis penetrating in the direction.

Moreover, in this invention, as described in Claim 4, the opening part for maintenance is formed in the backside of the sewing machine frame in which the said drive motor is arrange | positioned in a predetermined position, The rear cover which closes this opening part can be detachably attached to the back part of the sewing machine frame. By providing the structure provided, it is possible to open and close the opening greatly by attaching and detaching this next cover, and to carry out maintenance to the internal mechanism of the sewing frame very easily.

In addition, in the case where the said motor mounting stand is pivotally supported by the rear end of the front part mounting stand attached so that fixation was possible to the side outer surface of the said frame (claims 2 and 3), it describes in Claim 5 As described above, it is possible to cross and abut between the motor mounts and the outer surface of the fixed motor mount of the front part in the second state, and to fix both of them by fixing them to both mounts in the crossed and abutted state, respectively. It is preferable to provide a reinforcing member for fixing the mounting stand which can fix and hold the stand in a straight line shape. In this case, the motor mounting stand can be reliably and strongly in a predetermined position and a predetermined posture by sufficiently opposing the large rotation moment around the upper and lower shaft centers which act on the motor mounting stand due to the high tension force applied to the timing belt during the operation of the sewing machine. Can be fixed and supported. Therefore, the rotational moment causes the output shaft of the drive motor to be inclined with respect to the main shaft, and the distance between the shafts is fluctuated. As a result, the rotational power transmission performance from the drive motor to the main shaft is reduced, or the timing belt is unexpectedly lost. It is possible to reliably prevent the occurrence of a defective situation such as the above.

In particular, as the reinforcing member for fixing the mounting table, it is preferable to use one having a substantially U-shape as viewed from the side and formed in such a manner as to be able to cross and contact two upper and lower portions of the outer surface of both mounting tables.

Further, in the motor-driven sewing machine according to the present invention, as described in claim 7, a bearing for rotatably supporting the timing pulley on the main shaft side to the fixed motor mounting stand of the front part is provided with respect to the fixed motor mounting stand. It is preferable to set it as the structure which can adjust a fixed position, and maintains the distance between the said main shaft and the shaft between the output shaft of a drive motor by adjustment. In this case, by adjusting the position of the bearing relative to the motor mount during initial assembly, the distance between the output shaft and the main shaft of the drive motor can be easily and precisely optimized to improve the electric performance at the time of shipment and the quality of the sewing machine. This condition can be maintained over the long term.

Further, in the motor-driven sewing machine according to the present invention, as described in claim 8, the belt cover covering both the timing pulley and the timing belt is separated from the outer surface of the motor mount or the outer surface of the side of the motor mount and the sewing frame. It is preferable to attach as much as possible. In this case, the belt cover needs to be attached and detached during maintenance. However, during normal sewing, the motor assembly, which is exposed in the exposed state, can be covered on the side of the sewing frame to ensure safety for the operator.

Other effects will be found in the description of the examples below.

(Example)

Fig. 1 is a schematic perspective view of the entire motor-driven sewing machine according to the present invention, in which Fig. 1 is a sewing frame made up of the sewing bed portion 1A and the sewing arm portion 1B, and in this sewing frame 1 The cylinder bed portion 2 extends from the lower portion of the front surface of the sewing bed portion 1A in the opposite direction to the sewing progress direction a (the front side of the sewing machine), and at the same time, the sewing bed portion in the sewing frame 1 ( In the rear part of 1A), the detachable rear cover 3 which opens and closes the opening part at the time of performing various maintenances, such as inspection, adjustment, and maintenance with respect to the internal mechanism (not shown) incorporated in the sewing machine frame 1, is provided. It is installed. In FIG. 1, 22 is a thread tension regulator, 23 is a hand pulley.

From the sewing bed part 1A in the said sewing frame 1, as shown to FIG. 2 and FIG. 3, the main shaft 4 protrudes toward the outer side of the sewing bed part 1A. On the other hand, at the position immediately after the sewing bed portion 1A in the sewing frame 1, the electric drive motor 5 moves its output shaft 5a to the main shaft 4 at a position very close to the rear cover 3. It is arranged in parallel with the.

The side outer surface of the sewing bed portion 1A in the sewing frame 1 is provided with a fixed motor in the front portion through a plurality of first screw members 12 (four in the figure, but three or five may be used). While the base 11A is fixedly detachable, the female end fitting portions 11a and 11b formed so as to be fitted to each other from the front and rear are vertically attached to the rear end of the fixed motor mounting base 11A of the front portion. A motor mounting stand 11B rotatably supported around its upper and lower shaft centers is pivotally connected via a shaft 24 penetrating therethrough, and the movable motor mounting stand 11B of the rear part and the fixed motor mounting stand of the front part are pivotally connected. A series of long rectangular plate-shaped motor mounts 11 is formed before and after by 11A.

In addition, among these motor mounts 11, the drive motors 5 are arranged on the inner surface side of the movable motor mounts 11B of the rear portion, and the plurality of screws 13 (four on the drawing are shown in the figure, but three, even five). It may be fixed above). With this configuration, the drive motor 5 is moved to the sewing bed by rotating the rear movable motor mount 11B about the front center fixed motor mount 11A about the axis of the upper and lower shafts 24. It is set as switchable to the 1st state which pulled out and displaced the side part of 1 A of parts, and the 2nd state arrange | positioned in the predetermined position of the immediate part of the sewing-bed part 1A.

The output shaft 5a of the drive motor 5 penetrates the insertion hole 14 formed in the rearward movable motor mounting base 11B of the motor mounting base 11 to mount the motor mounting base 11 (11B). Is projected to the outer surface side, and the timing pulley 9 on the electric side is fixed to the protruding output shaft 5a portion via the vis 7, while the front fixed motor mounting table of the motor mounting table 11 is fixed. On the corresponding portion of the main shaft 4 of 11A), a bearing for rotatably supporting the adapter 15, which can be fitted and detached from the outer side of the main shaft 4, through the bearing 16 and the bearing pressing section 17. A press-fitting hole 18 is formed and abuts against the outer surface side of the adapter 15 rotatably supported via the bearing 16 press-fitted into the press-fitting hole 18 and fits into the main shaft 4. The manual pulled timing pulley 8 is fixed to the main shaft 4 via the screw 19.

Between the timing pulley 9 on the transmission side and the timing pulley 8 on the manual side, a timing belt 10 for linking the main shaft 4 and the output shaft 5a of the drive motor 5 is wound. It is wound tightly and installed. The load tension of the timing belt 10 is controlled by the maker side at the time of sewing machine shipment to adjust the fixed position with respect to the front fixed motor mounting base 11A of the said bearing 16, and the main shaft 4 and the drive motor 5, respectively. It is set to an optimum value in advance by precisely adjusting the inter-axis distance L (see FIG. 3) with the output shaft 5a of the ().

When the front and back motor mounting stages 11A and 11B are made into the said 2nd state in the side part outer side of the said motor mounting stage 11, they are crossed across between the outer surfaces of those front and rear motor mounting stages 11A and 11B. A reinforcing member 25 for holding and fixing a fixing member having a length that can be abutted is provided, and the reinforcing member 25 extends across the outer surfaces of the front and rear motor mounting brackets 11A and 11B so as to be brought into contact with each other in a state of contact. Both front and rear motor mounts 11A and 11B are fixed to the front and rear both motor mounts 11A and 11B through the two screw members 26 (although only four or more are illustrated on the drawing). It is comprised so that fixation and maintenance to a shape are possible.

In addition, on the outer surface side of the motor mounting table 11, belt covers 20 covering the two timing pulleys 8 and 9 and the timing belt 10 are provided with two bolts 21 (although two are shown in the drawing). Or above).

In the motor-driven sewing machine configured as described above, in normal sewing use, as shown in FIG. 3, both front and rear mounting brackets 11A and 11B of the motor mounting bracket 11 cross over their outer surfaces. The output shaft 5a of the drive motor 5 and the main shaft 4 of the drive motor 5 are held at the same time in the second state, which is fixed and held in a straight forward and backward shape by the reinforcing member 25 to be brought into contact with and fixed. 9 and 8 and the timing belt 10 are linked to each other, and by operating the drive motor 5 in this state, the driving rotational force is transmitted through the timing pulleys 9 and 8 and the timing belt 10 to the main shaft ( 4), a predetermined sewing operation is performed.

Then, when maintenance, such as inspection, adjustment or maintenance of the internal mechanism of the sewing machine frame 1, is necessary, the bolt 21 is loosened and the belt cover 20 is separated from the motor mounting base 11, and then timing is performed. The belt 10 is removed, the second screw member 26 is loosened and the reinforcing member 25 is fixed and released from the motor mount 11, and then the rear movable motor mount 11B is fixed at the front. The drive motor 5, the rear part movable motor mounting base 11B, and the timing pulley 9 on the transmission side are rotated in the direction of an arrow X about the shaft center of the upper and lower shafts 24 with respect to the motor mounting base 11A. As shown in Fig. 4, the sewing machine frame is switched to the first state in which the motor output shaft 5a is pulled out to the outside of the side of the sewing bed portion 1B and displaced so that the motor output shaft 5a is in an orthogonal or almost perpendicular attitude with respect to the main shaft 4. In the rear part of the sewing-bed part 1A in (1), the drive motor 5 Secure a large working space and been removed, in this state to open the opening, by leaving the rear cover 3 can be made to facilitate and easily the predetermined maintenance.

After the maintenance is finished, the rear cover 3 is fixed to close the opening, and then the rear movable motor mounting base 11B is moved toward the front fixed motor mounting base 11A with respect to the shaft center of the upper and lower shafts 24. As shown in FIG. 3, the motor output shaft 5a is formed by rotating the drive motor 5, the rear movable motor mounting base 11B, and the timing pulley 9 on the transmission side in the circumferential direction of the arrow Y. The reinforcing member 25 is placed across the outer surfaces of the front and rear motor mounting brackets 11A and 11B while being disposed at a predetermined position of the immediately after the sewing bed portion 1B so as to be in a parallel position with respect to 4). In a second state in which both front and rear motor mounts 11A and 11B are fixed to each other via the second screw member 26 and the front and rear motor mounts 11A and 11B are fixed and held in a front and rear straight line shape. After that, the timing belt 10 is wound between both timing pulleys (8.9), and then the By fixing the belt cover 20 to the motor mounting base 11 via the teeth 21, the normal sewing use state can be restored.

As described above, the drive motor 5 is placed very close to the rear wall of the sewing bed portion 1A at the immediately after the sewing frame 1, thereby simplifying and compacting the overall structure of the sewing machine, After disassembling the components of the electric assembly one by one and assembling one by one after maintenance, or after the motor timing shaft pulley 9 is unfixed from the motor output shaft 5a at the time of maintenance, the drive motor 5 ) Is detached from the motor mount 11 while supporting by hand, and the weight of the drive motor 5 is transferred to the rear movable motor mount 11B without the cumbersome operation of attaching them in order after maintenance. While being entrusted, the drive motor 5 can be easily and efficiently operated with little work labor and operation effort of rotating around the axis of the upper and lower shafts 24 of the rear movable motor mounting table 11B. Can be removed or reinstated.

In addition, since the rear movable motor mounting base 11B may rotate around the shaft center of the vertical shaft 24 at the correct position, the output shaft 5a and the main shaft 4 of the drive motor 5 during the retirement and return. There is no change in the distance between the shaft and the shaft L, and it is possible to reliably maintain the constant shaft distance that is precisely adjusted at the manufacturer side, etc. at the time of sewing machine delivery, so that even after maintenance, it is appropriate and good motor performance. Can be stably reproduced. In particular, the load tension on the timing belt 10 is maintained at the value at the time of initial adjustment without excessive shortage, thereby preventing deterioration of the electric performance and adverse influence on the belt life.

Moreover, in the said embodiment, it is a reinforcement member 25 for fixing and holding both front and back motor mounting stages 11A and 11B in a straight front and back shape, and between the lower outer side surfaces of those front and back both motor mounting stages 11A and 11B. Although the thing which has the length which can cross and abut in a straight line shape was used, as shown by the imaginary line of FIG. 2, it is a substantially U-shape from the side, and of the outer surface of both front and back motor mounts 11A, 11B. It is preferable to use the thing of the form which can contact across over top and bottom. In this case, due to the high tension force applied to the timing belt 10 in the second state (sewing operation state), it is sufficiently opposed to the large rotation moment around the vertical axis center acting on the rear movable motor mounting base 11B. The motor mounts 11A and 11B can be fixed and held in a straight line even more reliably and powerfully.

In addition, the reinforcing member 25 may be a bar member having a rectangular cross section, or a flat bar bent in an L shape.

In addition, in the said embodiment, the motor mounting stand 11 is divided into two front and back, Among them, the mounting stand 11B of a rear part pivotally rotates about an up-down axis center with respect to the mounting stand 11A of a front part. Although described as supporting, the front mounting bracket 11A is pivotally supported on the bracket attached to the sewing bed portion 1B without rotation by using the front mounting bracket 11A so as to be rotatable around the vertical axis. It is good also as a structure made.

The drive motor is placed very close to the rear wall of the sewing machine frame immediately after the sewing machine frame to simplify and compact the overall sewing machine, while disassembling the components of the electric assembly one by one during maintenance and one by one after maintenance. It is a cumbersome operation labor to assemble, or to remove and remove the timing pulley from the motor output shaft during maintenance, remove it from the motor mount while supporting the heavy driving motor, and attach them again in sequence after maintenance. The drive motor can be easily withdrawn and returned with little labor and operation effort without requiring this large operation. In addition, since the motor mounting table can be rotated around the upper and lower shaft centers at the correct positions, the distance between the shaft of the drive shaft and the output shaft of the drive motor does not change at the time of the retirement and return. It is possible to reliably maintain a constant interaxial distance that is precisely adjusted in the back and the like, so that even after maintenance, proper and good rolling performance can be stably reproduced. In particular, it is possible to obtain an effect of preventing problems such as deterioration of electric performance and belt life due to excessive load tension on the timing belt.

Claims (8)

A main shaft protruding outward from the sewing frame to the side, a drive motor disposed at the rear portion of the sewing frame so that its output shaft is parallel to the main shaft, and extending rearward from the side of the sewing frame on the side where the main shaft protrudes And a motor mounting table for holding and supporting the drive motor, and a timing pulley and a timing belt for interlocking the output shaft of the drive motor and the main shaft at a position outside the side of the sewing frame. By the rotational movement around the up-and-down shaft center, the said motor mounting stand is switchable to the 1st state which pulled out and displaced the said drive motor to the outer side of the sewing frame, and the 2nd state arrange | positioned and fixed in the predetermined position of the back of the sewing frame. Motor-driven sewing machine characterized in that the configuration. 2. The motor of claim 1, wherein the motor mount is pivotally connected to the rear end of the fixed motor mount of the front portion removably attached to the side outer surface of the sewing frame so as to be switched between the first state and the second state. Motor-driven sewing machine, characterized in that there is. 3. The female end of the fixed motor mount of the front portion and the front end of the motor mount of the front portion are formed with male and female fitting portions which are fitted to each other from front and rear, respectively, and penetrate the female portion through the vertical portion. A motor-driven sewing machine, characterized in that the motor mounting plate is pivotally connected to the fixed motor mounting plate so as to be rotatable about the vertical axis. The sewing machine frame rear part in which the said drive motor is arrange | positioned in a predetermined position is provided with the opening part for maintenance, The rear cover which blocks this opening part is detachably attached to the back part of the sewing machine frame, Motor-driven sewing machine, characterized in that there is. The method according to claim 2 or 3, wherein in the second state, abutment can be made across the outer surface of the motor mount and the front portion of the fixed motor mount, and fixed to both mounts in the abutted state. The motor drive type sewing machine characterized by the above-mentioned reinforcing member for fixing the mounting stand which can fix and hold both the mounting stands in a straight line shape. 6. The motor according to claim 5, wherein the reinforcing member for fixing the mounting stand is formed in a shape that is substantially U-shaped when viewed from the side, and which can be contacted across two upper and lower portions of the outer surface of both mounting stands. Driven sewing machine. 3. The bearing of claim 2, wherein a bearing for rotatably supporting a timing pulley on the main shaft side can adjust a fixed position with respect to the fixed motor mounting table. A motor-driven sewing machine, characterized in that the distance between the shaft and the output shaft of the drive motor can be adjusted. The motor drive according to claim 1 or 2, wherein the belt cover covering both the timing pulleys and the timing belts is detachably attached to the outer surface of the motor mount or the outer surface of the motor mount and the side of the sewing frame. Expression sewing machine.

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