JP5212938B2 - Industrial sewing machine drive - Google Patents

Description

  The present invention relates to a drive device for an industrial sewing machine such as an overlock sewing machine. Specifically, the sewing machine main shaft fixed to and supported by the rear part of the motor mounting base disposed on the side surface of the sewing machine main body and extending to the rear part of the sewing machine main body is protruded outward from the side of the sewing machine main body. And an output shaft of a motor for motor use, which are linked to each other by a toothed pulley fixed to both shafts and a toothed belt wound between the toothed pulleys, and between the motor mounting base and the sewing machine body. Is provided with mounting base fixing means such as a bolt for changing the distance between the two shafts relative to the sewing machine body and adjusting the tension of the toothed belt so that the position of the motor mounting base can be moved and fixed. The present invention relates to an industrial sewing machine drive device.

  In the industrial sewing machine drive device having the basic configuration as described above, a toothed belt wound between a toothed pulley fixed to the sewing machine main shaft and a toothed pulley fixed to the output shaft of the motor. If the tension is too strong, the load on the sewing machine spindle and motor may be large, causing the motor to overheat, or the belt may break due to short-term use.If the tension of the toothed belt is too weak, There is a problem that a stable power transmission performance cannot be ensured due to the belt wavy or slipped against the pulley. In order to eliminate such a problem, it is important that the tension of the toothed belt is properly adjusted at the time of completion of the initial assembly for attaching the motor mount to the side surface of the sewing machine body.

  As a tension adjusting means for such a toothed belt, conventionally, a motor mounting plate whose position can be fixed by a bolt or the like is provided on the side surface of the sewing machine body, and a motor side is provided between the motor mounting plate and the side surface of the sewing machine body. Projecting from a plurality of locations around the output shaft, and screwed by a plurality of screw shafts such as a single hole formed in the motor mounting plate and a bolt inserted into a concentric elongated hole formed around the single hole. A support plate that can be fixed is provided, and the support plate is rotated about one screw shaft among the plurality of screw shafts through the operation of an adjustment element such as an adjustment screw with respect to the motor mounting plate. By fixing at the corner, the distance between the output shaft of the motor and the main spindle of the sewing machine body can be changed, and the tension of the belt wound between pulleys fixed to both shafts can be adjusted. What was known (e.g., see Patent Document 1).

  Republic of China M270186 Patent Gazette

  However, the belt tension adjusting means as disclosed in the above-mentioned Patent Document 1 is not only a motor mounting plate, but also a receiving plate that substantially fixes and supports the motor, and this receiving plate is rotatably mounted on the motor mounting plate. Screw shafts such as a plurality of bolts, a plurality of screw holes formed in the receiving plate for screwing and fixing these screw shafts, an adjusting screw for rotating and fixing the receiving plate to the motor mounting plate, etc. The tension adjusting means has a very complicated structure, requiring a large number of components and parts, such as an adjusting element of the belt. As a result, not only the assembly man-hour of the entire drive device is increased, but also the belt after assembly. Many operations are required to adjust the tension. In addition, when adjusting the belt tension, the weight of the heavy motor is loaded as a rotational moment about a single screw shaft, and adjustment elements such as adjustment screws must be operated against the load moment. There is a problem that a large operating force is required to adjust the belt tension.

  The present invention has been made in view of the above circumstances, and it is possible to reduce the number of components and parts as much as possible, thereby simplifying the structure and reducing the number of assembly steps of the entire apparatus, and adjusting a predetermined belt tension. It is an object of the present invention to provide a drive device for an industrial sewing machine that can be easily and lightly performed with a small number of operations and a small operating force.

In order to achieve the above object, an industrial sewing machine drive device according to the present invention includes a sewing machine main shaft that protrudes outward from a side portion of the sewing machine main body, and a side surface of the sewing machine main body. The output shaft of the motor for driving the sewing machine, which is fixedly supported at the rear part of the motor mount extending to the rear part of the machine, is interlocked by a toothed pulley fixed to both shafts and a toothed belt wound between the toothed pulleys. The motor mounting base is moved between the motor mounting base and the sewing machine body in a direction to adjust the tension of the toothed belt by changing the distance between the two shafts relative to the sewing machine main body. the drive device for industrial sewing machines which can and position fixing freely attach multiple mount fixing means are provided, on the side surface of the sewing machine body distribution in the circumferential range of the toothed belt By axial rotation operable eccentric cam around orthogonal to position moving direction of the motor mount is attached, the eccentric cam about the axis of the screwing fixed pin-like shaft member on the side surface of the sewing machine one being rotated operably fitted and held, wherein the motor mount, said has holes having an inner periphery in sliding contact with the outer peripheral surface of the eccentric cam is formed, a motor said plurality of mount fixing means by mount is operated to rotate the eccentric cam as ready position movement relative to sewing machine body, the tension of the toothed belt the motor mount by positional movement in the direction is configured to be adjusted In addition, a safety and dustproof cover that covers the entire outside of the toothed pulley, the toothed belt, and the eccentric cam is detachably attached to the outer surface portion of the motor mounting base. A protruding flange portion on the sewing machine main shaft side of the all-cum-dust cover and the motor mounting portion overlapping the protruding flange portion are arranged on the side of the sewing machine main body and rotate integrally with the main shaft to the lubricating oil storage portion. An outside air intake port is formed by a cooling fan that feeds a cooling air flow .

According to the present invention having the above-described characteristic configuration, the belt tension adjusting function (means) can be obtained simply by attaching the eccentric cam to the side surface of the sewing machine body and forming the hole into which the eccentric cam fits in the motor mount. ) Can be formed, and compared with the conventional one shown in Patent Document 1, not only can the number of components and parts be remarkably reduced to simplify the structure and reduce the manufacturing cost, The number of assembling steps of the drive device can also be reduced. In addition, the eccentric cam is mounted in a state where the mounting base fixing means can be moved relative to the sewing machine body, i.e., the weight of the apparatus including the motor and the motor mounting base is shared by a plurality of mounting base fixing means. It is possible to adjust the tension of the toothed belt by moving the position of the motor mounting base simply by rotating, and the belt tension can be easily adjusted with less effort compared to the conventional one shown in Patent Document 1. In addition, it can be performed lightly with a small operating force.
In addition, since the eccentric cam attached to the side surface portion of the sewing machine body serves as a positioning pin when the motor mounting base is assembled to the side surface portion of the sewing machine body, that is, a knock pin, the above-described operation is performed. Combined with the reduction of the number of parts as described above, there is an effect that the assembling work of the entire drive device can be very easily and labor-saving.

Further, Oite the present invention, the eccentric cam, since it is located within the circumferential range of the toothed belt, the outer portion of the generally safe Ensuring and toothed pulleys and toothed belt for dustproof By simply removing the safety and dust-proof cover provided on the machine, the position of the eccentric cam can be determined at a glance, and a sufficiently large space without any obstacles can be secured around it. By fitting in the rotation operation section, not only the initial adjustment of the belt tension but also an intermediate adjustment operation corresponding to the elongation of the belt accompanying long-term use, etc. can be performed easily, lightly and quickly.

Further, in the present invention, the eccentric cam, because you are a mounting structure for rotating operably fitted and held about the axial center of the screw-fixed pin-like shaft member on the side surface of the sewing machine body, said eccentric cam As in the case of a mounting structure that is rotatably held on the side surface of the sewing machine body through a shaft that is integrally formed on the base end side, a shaft that is integrally formed on the base end side of the eccentric cam is arranged around the shaft center. It is not necessary to form a shaft hole with high machining accuracy on the sewing machine main body side so that it can be rotated without running out of focus, and the role of the positioning pin when attaching the motor mounting base to the side surface of the sewing machine main body is accurate. Therefore, it is more effective from the standpoint of assembly and processing accuracy of the apparatus.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an overall perspective view of an overlock sewing machine to which an industrial sewing machine drive device according to the present invention is applied, FIG. 2 is an exploded perspective view of a main part, and FIG. 3 is a right side view. 1 to 3, reference numeral 1 denotes a sewing machine main body, and a left-hand side needle that reciprocates up and down (it is well known and will not be described), a presser foot 2, a cloth feed tooth 3 and a looper ( A cross-plate 4 provided with a description is omitted because it is well known, and a lubricating oil storage portion 5 called an oil pan is attached to a lower end portion of the sewing machine body 1. .

  A substantially semi-dome-shaped recess 6 that opens outward is formed at the right end of the sewing machine body 1, and the recess 6 is inserted into the sewing machine body 1 so as to extend outward to the right. A cooling fan 22 that is fixed to the protruding main shaft 7 and rotates together with the main shaft 7 is disposed. A motor mount 8 extending from the right end surface 1A to the rear portion so as to close the opening of the recessed portion 6 is disposed on the right end surface 1A of the sewing machine body 1, and the rear end of the motor mount 8 A sewing machine driving motor 9 is fixedly supported on the portion.

  The motor mount 8 includes large through-holes (so-called fool holes) 11 formed at a total of three locations, a front side position of the motor mount 8 and a vertical position of the front and rear intermediate portion, and a right side of the sewing machine body 1. Three female screw holes 12 formed at locations corresponding to the three through holes 11 on the end face 1A and three screw holes that can be inserted into the through holes 11 from the right outer side of the motor mounting base 8 and screwed into the female screw holes 12. 3 is moved relative to the sewing machine body 1 in the direction of arrows ab in FIG. 3 via a mounting base fixing means comprising a bolt 13 (only one is shown in FIG. 2 so as not to overlap). It is attached so that it can be fixed as well as possible.

  A recess 8a for winding a toothed belt, which will be described later, is formed on the outer surface side of the motor mount 8. The sewing machine main shaft 7 and the output shaft 10 of the motor 9 are connected to the motor mount 8. It is inserted and protrudes into the recessed space 8a. The sewing machine main shaft 7 and the output shaft 10 of the motor 9 projecting into the recessed space 8a are respectively provided with a small-diameter toothed pulley (hereinafter referred to as a timing pulley) 14 and a large-diameter toothed pulley (hereinafter referred to as a timing pulley). (Referred to as a timing pulley) 15 is fixed, and a toothed belt (hereinafter referred to as a timing belt) 16 is wound around the timing pulleys 14 and 15, and the timing belt 16 causes the above-mentioned timing belt 16 to The output shaft 10 of the sewing machine drive motor 9 and the sewing machine main shaft 7 are linked and connected.

  The position of the motor mount 8 is located on the right end surface 1A of the sewing machine body 1 at a position corresponding to the approximate center of the distance between the main shaft 7 of the sewing machine 7 and the motor output shaft 10 within the rotation range of the timing belt 16. An eccentric cam 17 that can be rotated in an arrow c direction around an axis orthogonal to a moving direction (arrow ab direction) is attached, while a portion corresponding to the position of the motor mount 8 is A hole 18 having an inner peripheral edge that is in sliding contact with the eccentric outer peripheral surface 17a of the eccentric cam 17 is formed, and the three bolts 13 constituting the mounting base fixing means are slightly loosened with respect to the female screw hole 12, and the motor mounting base 8 is formed. Is moved in the ab direction relative to the sewing machine body 1 and the eccentric cam 17 is rotated to move the motor mounting base 8 in the ab direction to thereby move the timing belt. 6 tension of being fine-adjustable configuration.

  Here, as shown in FIG. 4, the eccentric cam 17 is arranged around the axis of the pin-shaped shaft member 21 outside the pin-shaped shaft member 21 screwed and fixed to the right end surface 1 </ b> A of the sewing machine body 1. The right end portion of the eccentric cam 17 is rotatably fitted and held, and an insertion groove (rotation operation portion) 17b at the tip of a driver, which is an example of a manual tool, is formed.

  In addition, a plurality of safety and dust-proof covers 19 covering the entire outer sides of the timing pulleys 14 and 15, the timing belt 16 and the eccentric cam 17 located in the recessed space 8 a are provided on the right outer surface portion of the motor mount 8. Through the bolt 20 of the book (shown by two in the drawing, but may be three or more) and the female screw hole 8d formed in the raised portion 8c formed in the recessed space 8a of the motor mounting base 8. And is detachably attached. The protruding flange portion 19a of the safety and dustproof cover 19 and the motor mounting base 8 portion overlapping the flange portion 19a are formed with outside air intake ports 19b and 8b by the cooling fan 22 in a semicircular arc shape, A cooling air flow generated from the outside air intake ports 19b and 8b as the cooling fan 22 rotates is supplied to the lubricating oil storage unit 5 to cool the lubricating oil by indirect heat exchange. Yes.

  Further, on the upper side near the rear of the motor mounting base 8, when the motor mounting base 8 is attached to a predetermined position of the right end surface 1A of the sewing machine body 1, the weight of the supporter can be supported by hand. The portion 8A is integrally formed.

  In the overlock sewing machine configured as described above, the driving rotational force of the output shaft 10 of the sewing machine driving motor 9 increases to the sewing machine main shaft 7 via the large-diameter timing pulley 15, the timing belt 16, and the small-diameter timing pulley 14. While being transmitted at high speed, the rotational force of the sewing machine main shaft 7 is transmitted to each part to move the needle up and down, and the looper, the cloth feed dog 3 and the like are operated to perform predetermined sewing. Further, at the time of sewing, the outside air taken in from the outside air intake ports 19b and 8b is supplied to the lubricating oil storage portion 5 as a cooling air flow by the operation of the cooling fan 22 rotating integrally with the sewing machine main shaft 7, and lubricated. The oil is cooled by indirect heat exchange.

  In order to perform the sewing operation as described above smoothly and smoothly, the timing pulleys 15 and 14 fixed to the two shafts 10 and 7 to interlock the output shaft 10 of the sewing machine driving motor 9 and the sewing machine main shaft 7. It is very important to properly initialize the tension of the timing belt 16 wound around in between without excessively and excessively. As a belt tension adjusting means for that purpose, in the embodiment of the present invention, as described above, the eccentric cam 17 is attached to the right end surface 1A of the sewing machine body 1 and the eccentric cam 17 is fitted into the motor mounting base 8. Since only the holes 18 need to be formed, the structure can be simplified and the manufacturing cost can be reduced by significantly reducing the number of components and parts compared to the conventional one shown in Patent Document 1. In addition, it is possible to reduce the number of assembling steps for the entire driving device.

  In addition, the three bolts 13 constituting the mounting base fixing means are slightly loosened with respect to the female screw holes 12 so that the motor mounting base 8 can move in the ab direction relative to the sewing machine body 1. By inserting the tip of a screwdriver into an insertion groove (rotation operation portion) 17 b formed in the right end portion of the eccentric cam 17 and rotating the eccentric cam 17, the motor mounting base 8 can move the outer periphery of the eccentric cam 17. It is possible to adjust the tension of the timing belt 16 by being pressed in the ab direction by an eccentric amount by being pressed at the inner peripheral edge of the hole 18 that is in sliding contact with the surface. The belt tension can be adjusted easily with less effort and lightly with less operating force than those of the above.

  Further, the eccentric cam 17 attached to the right end surface portion 1A of the sewing machine main body 1 serves as a positioning pin, that is, a knock pin when the motor mounting base 8 is assembled to the right side surface portion of the sewing machine main body 1. Therefore, in combination with the reduction in the number of parts as described above, the assembly operation of the entire drive device can be performed very easily and labor-saving.

In the above-described embodiment, the eccentric cam 17 has been described with the mounting structure in which the pin-shaped shaft member 21 screwed and fixed to the right end surface 1A of the sewing machine body 1 is fitted and held so as to be rotatable around the shaft center. Instead, as shown in FIG. 5, a shaft 21A is integrally formed on the proximal end side of the eccentric cam 17, and the shaft 21A is inserted into a shaft hole 1a formed on the right end surface 1A of the sewing machine body 1. It is also conceivable to adopt an attachment structure in which the shaft is inserted and held so as to be rotatable around the axis .

However, in the case of the mounting structure as shown in FIG. 5, only one part is required, but on the base end side of the eccentric cam 17, the integrally formed shaft 21A is rotatably held around the axis. In addition, high machining accuracy is required for the shaft hole 1a on the sewing machine body 1 side. On the other hand, in the case of the mounting structure as shown in FIG. 4, it is not necessary to form a shaft hole with high machining accuracy on the sewing machine body 1 side, and the motor mounting base 8 is attached to the right end surface 1A of the sewing machine body 1. The mounting structure shown in FIG. 4 is more effective from the viewpoint of the assembly and processing accuracy of the device, because the role of the positioning pin when assembling is surely and accurately performed. is there.

  Further, in the above embodiment, the description has been given of what is applied to the overlock sewing machine. However, the sewing machine may be applied to an industrial sewing machine such as a flat stitch sewing machine or other chain stitch sewing machine. An effect is produced.

1 is an overall perspective view of an overlock sewing machine to which an industrial sewing machine drive device according to the present invention is applied. It is a disassembled perspective view of the principal part of an overlock sewing machine same as the above. It is a right view of an overlock sewing machine same as the above. It is an expanded vertical sectional view of the principal part. It is an expanded longitudinal cross-sectional view of the principal part which shows other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewing machine body 1A Right end surface part of sewing machine body 7 Sewing machine main shaft 8 Motor mounting base 9 Sewing machine driving motor 10 Motor output shaft 14, 15 Timing pulley (tooth pulley)
16 Timing belt (toothed belt)
17 Eccentric cam 17b Insertion groove (rotation operation part) at the tip of the driver
18 holes 21 pin-shaped shaft member

Claims (2)

A sewing machine driving motor fixed to and supported by a rear part of a motor mounting base disposed on a side surface of the sewing machine main body and extending to a rear part of the sewing machine main body, and a sewing machine main shaft that protrudes outward from the side of the sewing machine main body. The output shaft is interlocked and connected by a toothed pulley fixed to both shafts and a toothed belt wound between the toothed pulleys, and a motor is mounted between the motor mount and the sewing machine body. An industrial sewing machine provided with mounting base fixing means for changing the distance between the two shafts with respect to the main body of the sewing machine so that the position of the mounting base can be moved and fixed in the direction of adjusting the tension of the toothed belt. In the drive device,
Wherein the side surface of the sewing machine main body, the toothed belt rotational operable eccentric cam around a center of a shaft disposed within the circumferential range perpendicular to the position moving direction of the motor mounts are attached, the eccentric cam The inner periphery of the motor mounting base is slidably contacted with the outer peripheral surface of the eccentric cam, while being rotatably fitted around the shaft center of the pin-shaped shaft member fixed to the side surface of the sewing machine body. The motor mounting base is positioned in the direction by rotating the eccentric cam with the mounting base fixing means in a state in which the motor mounting base is movable relative to the machine body. The tension of the toothed belt can be adjusted by moving it , and
A safety and dust-proof cover that covers the entire outside of the toothed pulley, the toothed belt, and the eccentric cam is detachably attached to the outer surface portion of the motor mount. The sewing machine main shaft of the safety and dust-proof cover Cooling that is disposed on the side of the sewing machine main body and rotates integrally with the main shaft to supply a cooling air flow to the lubricating oil storage portion on the protruding flange portion on the side and the motor mounting portion that overlaps the protruding flange portion A drive device for an industrial sewing machine, wherein an opening for taking in outside air by a fan is formed .   The eccentric cam is disposed at a substantially central portion of a distance between the sewing machine main shaft and the motor output shaft within a rotation range of the toothed belt, and a rotating operation portion by a manual tool is formed on the eccentric cam. Item 2. The industrial sewing machine drive device according to Item 1.

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