JP3496413B2 - sewing machine - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine which moves a work cloth freely in a front-rear direction and a horizontal direction by a feed stand provided on a sewing machine bed. The present invention relates to a so-called R-θ control sewing machine that performs a sewing operation. FIG. 6 schematically shows the appearance of a conventional R-θ controlled sewing machine of this type. Here, the sewing machine main body 1 provided on the sewing machine table includes a sewing machine bed 2, a rising portion 3 rising upward from a rear portion of the sewing machine bed 2, and an arm portion 4 extending forward from an upper portion of the rising portion 3. It is configured. On the upper surface of the sewing machine bed 2, a feed base 5 and a pressing arm (not shown) are provided so as to be integrally movable in the front-rear direction and swingable in the left-right direction. A work cloth (not shown) is provided on a cloth holding frame 5 a
Further, the holding arm is sandwiched and held between cloth holding frames provided at the distal end of the holding arm. In this case, the feed base 5
Are adapted to slide on a guide plate 6 provided on the sewing machine bed 2. On the other hand, although not shown, a linear drive mechanism including a motor, a cam mechanism, a lever and the like for moving the feed table 5 (and the holding arm) in the front-rear direction is provided inside the sewing machine bed 2. Also provided is a swing mechanism, which also includes a motor, a cam mechanism, and a lever, for swinging the feed table 5 (and the holding arm) in the lateral direction. The feed table 5 and the linear drive mechanism and the swing mechanism are connected to each other by two connecting portions vertically penetrating the guide plate 6 (the sewing machine bed 2). At this time, the guide plate 6 is provided with a straight hole 7 for allowing one connecting portion to move in the front-rear direction, and an arc-shaped hole 8 for allowing the other connecting portion to swing in the lateral direction. It is to be provided. [0004] However, the straight hole 7 and the arc-shaped hole 8 as described above are partially exposed on the upper surface of the guide plate 6 (sewing bed 2), and have such a size that the fingers of the operator can be put in. Therefore, improvement in safety is desired. The present invention has been made in view of the above circumstances, and an object thereof is to provide a hole necessary for moving a feed stand on a sewing machine bed, thereby improving safety. In providing sewing machines. [0006] In order to achieve the above object, a sewing machine according to the present invention comprises: a feed base movably disposed on a sewing machine bed for holding and moving a work cloth; A straight hole extending in the front-rear direction provided in the upper surface portion, an arc-shaped hole provided in the upper surface portion of the sewing machine bed that is curved in the horizontal direction, and the feed base disposed in the sewing machine bed in the front-rear direction. A linear drive mechanism for moving, a swing mechanism disposed in the sewing machine bed for swinging the feed table in a lateral direction, and a driving force of the linear drive mechanism to the feed table through the linear hole. A first transmission member for transmitting, a second transmission member for transmitting the driving force of the swing mechanism to the feed base through the arc-shaped hole, and a first transmission member that is elongated in the front-rear direction with respect to the linear hole, Integrated with the transmission member A first cover that moves in the front-rear direction and always closes the upper surface of the straight hole, and is configured to be long in the bending direction with respect to the arc-shaped hole, and swings integrally with the second transmission member. A second cover that always closes the upper surface of the arc-shaped hole, and the feed plate is provided on the upper surface of the sewing machine bed.
Slide the guide plates in an arc shape including the arc holes between each other.
In the form of two parts with a gap of
The feature is that the bar is located in the gap
Have . According to this, a straight hole required for moving the feed base in the front-rear direction is closed by the first cover, and an arc-shaped hole required for swinging the feed base in the lateral direction is provided by: The hole is not exposed to the outer surface part by being closed by the second cover. At this time, the first cover is configured to be longer in the front-rear direction with respect to the straight hole, and
Is formed to be longer than the arc-shaped hole in the bending direction, so that the linear hole and the arc-shaped hole are always closed even if the first and second covers move with the movement of the feed base. be able to. Then, fit the second cover between the guide plates.
It can be installed flush with the edge of the guide plate.
Use the part as a guide when the second cover moves
be able to. An embodiment of the present invention will be described below with reference to FIGS. 1 to 5. First, FIG. 5 schematically shows the appearance of the main body 11 of the sewing machine according to the present embodiment. Here, as shown in FIG. 4, the sewing machine main body 11 is installed on a sewing machine table (not shown). The sewing machine includes a bed 12, a rising portion 13 rising upward from a rear portion of the sewing bed 12, and an arm portion 14 extending forward from an upper portion of the rising portion 13. Although not shown, the arm 14
Is provided with a needle bar having a sewing needle at the tip thereof.
On the other hand, a needle plate 15 having a needle hole 15a (see FIG. 3) corresponding to the sewing needle is provided on the upper surface of the front end of the sewing machine bed 12, and the needle plate 15 is provided in the sewing machine bed 12. A thread catcher and the like are provided below the. In this case, the driving force of the spindle motor provided on the sewing machine table side is transmitted to the arm unit 1 via the belt transmission mechanism.
The needle bar is driven by being transmitted to the main shaft in the sewing machine 4, and the rotational force of the main shaft is transmitted to the lower shaft in the sewing machine bed 12 so that the thread catcher and the like are synchronized with the needle bar. And is driven. As shown also in FIGS. 1, 3 and 4, on the upper plate portion 12a constituting the upper surface of the sewing machine bed 12, the rising portion from the needle plate 15 is provided behind the needle plate 15. A guide plate is provided so as to extend to 13 and on which a feed stand described later slides. In this case, the guide plate is provided in a two-part shape of a front guide plate 16 and a rear guide plate 17, and as shown in FIGS. 1 and 3, an arc-shaped gap is provided between them. ing. Further, as shown by broken lines in FIGS. 1 and 3,
The rear guide plate 1 is used to move a feed plate to be described later.
7, a straight hole 18 penetrating the upper surface of the sewing machine bed 12 and extending in the front-rear direction is formed, and a gap between the front guide plate 16 and the rear guide plate 17 in the upper plate portion 12a of the sewing machine bed 12 is formed. Is formed with an arc-shaped hole 19 which extends in a curved shape in the same direction. The auxiliary plate 20 is extended to the side of the needle plate 15 and the front guide plate 16.
Are detachably attached. The upper surface of the needle plate 15, the front guide plate 16, the rear guide plate 17, and the auxiliary plate 20 are flush with each other, and the upper plate portion 12a of the sewing machine bed 12 is formed.
Is provided so as to be positioned one step lower (by the thickness of the guide plates 16 and 17). On the sewing machine bed 12, a feed bar 21 and a holding arm 22 are provided. Of which feed bar 21
Has a substantially rectangular shape that extends in the front-rear direction on the front guide plate 16 and the rear guide plate 17 and has a slightly wider base end (rear end). Further, as shown in FIGS. 3 to 5, a rectangular frame-shaped lower frame 23 located on the needle plate 15 is attached to the tip (front end) thereof. Note that an upper surface cover 21a (see FIG. 4) is placed on the upper surface of the feed base 21. On the other hand, as shown in FIG. 4, the pressing arm 22 has a base end connected to the base end of the feed base 21, a front end extending forward below the arm 14, and a rectangular end formed at the front end. It has a frame-shaped holding frame 24 (see FIGS. 3 and 4). The holding arm 22 can be displaced by a toggle mechanism 25 between an operation position where the holding frame 24 is pressed against the upper surface of the lower frame 23 with a predetermined spring force and a retracted position where the holding frame 24 is retracted upward. It has been. The holding arm 22 moves and swings in the front-rear direction integrally with the feed base 21. A work cloth (not shown) is held between the lower frame 23 and the holding frame 24 so as to be sandwiched therebetween. At this time, the feed base 21 (and the presser arm 22)
Is driven in a front-rear direction (arrow X direction) on guide plates 16 and 17 by a drive mechanism described later provided in sewing machine bed portion 12.
The work cloth is freely swung horizontally and vertically with respect to the needle bar. The sewing operation such as pattern sewing is performed while the sewing is being performed. Now, a drive mechanism for moving the feed table 21 will be described. FIG. 2 schematically illustrates an internal configuration of the sewing machine bed 12, wherein the driving mechanism includes:
It comprises a linear drive mechanism 26 for moving the feed table 21 in the front-rear direction (arrow X direction) and a swing mechanism 27 for swinging the feed table 21 in the horizontal direction (arrow θ direction). The linear drive mechanism 26 is configured to swing a linear lever 28 provided on the right side in the sewing machine bed 12 using a pulse motor 29 as a drive source. The linear lever 28 has a long shape in the left-right direction, and has a long hole 28 in the left-right direction at its tip (left end).
a is formed. The rear guide plate 17 is located at a height along the lower surface side portion (see FIG. 4), and its base end (right end) is pivotally supported by the shaft 30 on the right end in the sewing machine bed 12. The tip side can swing in the direction indicated by arrow A in FIG. On the other hand, the output shaft of the pulse motor 29 is connected via a transmission mechanism 31 to a cylindrical cam 32 having a cylindrical worm gear shape. A cylindrical roller (not shown) provided at an intermediate portion of the lower surface of the linear lever 28 is engaged with the groove of the cylindrical cam 32. By rotating the cylindrical cam 32 forward and backward by the pulse motor 29, the linear lever 28 can be freely swung in the direction of arrow A. As shown in FIG. 1, a rectangular frame 33 is slidably fitted in the elongated hole 28a of the linear lever 28 in the lateral direction. The rectangular frame 33 is provided with a long hole 33a long in the left-right direction, and a pin 34 (see FIG. 1) is inserted into the long hole 33a from below. The pin 34 is inserted into the straight hole 1 formed in the rear guide plate 17.
8 and projecting upward through the feed bar 21
Is connected to the base end. The square frame 33 and the pin 34 are now in the first position.
, And the swing of the linear lever 28 is transmitted to the feed base 21. At this time, the square top 33 shifts in the left and right direction within the elongated hole 28a (pin 3).
4 is fixed) so that the linear lever 2
The component in the left-right direction of the swing in the direction of the arrow A at the front end portion 8 is absorbed, and only the driving force in the front-rear direction is transmitted to the feed base 21. In addition, the linear hole 18 allows the pin 34 to move in the front-rear direction at this time. In this case, the pin 34 serves as a swing axis of the feed base 21. As will be described later, a first cover 35 is connected to the pin 34. On the other hand, the swing mechanism 27 is configured to swing an L-shaped lever 36 provided on the left side in the sewing machine bed 12 using a pulse motor 37 as a drive source. As shown in FIG. 2, the L-shaped lever 36 has an L-shape in which a base end side extends laterally (leftward) from a middle portion and a distal end side extends forward, and as shown in FIG. A portion is located below the linear lever 28 and is swingably supported on the sewing machine bed 12 by a shaft 38.
Further, the tip of the L-shaped lever 36 has an upper end having an upwardly convex shape corresponding to the arc-shaped hole 19 (see FIG. 4), and as shown in FIG. Is formed. On the other hand, the output shaft of the pulse motor 37 is connected via a transmission mechanism 39 to a cylindrical cam 40 having a cylindrical worm gear shape. A cylindrical roller 41 provided on the lower surface of the base end of the L-shaped lever 36 is engaged with the groove of the cylindrical cam 40. With this,
By rotating the cylindrical cam 40 forward and reverse by the pulse motor 37, the base end of the L-shaped lever 36 can be freely swung in the direction of arrow B.
The distal end of the L-shaped lever 36 swings in the direction of arrow C. The arc-shaped hole 19 (and the guide plate 16,
17) has an arc shape along the swing in the arrow C direction. Here, as shown in FIG.
1, a concave groove portion 42 extending in the front-rear direction is formed, and a long hole 42 a is formed extending in the center of the concave groove portion 42 in the front-rear direction. A square frame 43 is slidably fitted in the groove 42 in the front-rear direction. The square frame 43 is provided with a pin insertion hole, and a pin 44 is inserted into the pin insertion hole from above. This pin 44
The lower end is connected to the pin connection hole 36 a of the L-shaped lever 36 through the elongated hole 42 a and the arc-shaped hole 19 formed in the upper plate portion 12 a of the sewing machine bed 12. The square frame 43 and the pin 44 are now in the second position.
And the tip of the L-shaped lever 36 swings in the direction of the arrow C through the square top 43.
, The feed base 21 swings freely in the θ direction with the pin 34 as the swing axis. On this occasion,
The swing of the pin 44 in the direction of the arrow C is allowed by the arc-shaped hole 19. At this time, the square frame 43 is
By sliding relatively in the front-rear direction.
The feed table 21 can be moved in the front-rear direction without changing the position of the 3 (and the pin 44) in the front-rear direction. As will be described later, a second cover 45 is connected to the pin 44. Also,
An upper cover 21a provided on the upper surface of the feed base 21 covers the concave groove portion 42, the pin 44, the square frame 43, and the like so that they do not appear in the appearance. As shown in FIG. 1, FIG. 3, etc., the upper surface of the rear guide plate 17 (the lower surface of the feed base 21)
A first cover 35 for closing the upper surface of the straight hole 18 is slidably provided. The first cover 35 has a thin plate shape that is long in the front-rear direction, and has an insertion hole through which the pin 34 passes at a portion near the front end thereof. The first cover 35 is located between the square frame 33 and the feed base 21, and the pin 34 is inserted through the insertion hole, so that the pin 3
4 and is attached so as to be moved in the front-rear direction integrally with the feed base 21. At this time, a slit 46 is provided in the front wall portion 13a of the rising portion 13 of the sewing machine body 11, as shown in FIG. 5, and a rear portion of the first cover 35 is inserted through the slit 46. And is located inside the rising portion 13. In this case, the first cover 35 is
Even if it moves to the forefront, it is configured such that it always closes the straight hole 18 and the rear end does not come off the slit 46. On the other hand, the upper plate 12
In a, a second cover 45 for closing the upper surface of the arc-shaped hole 19 is slidably provided in an arc-shaped gap between the front guide plate 16 and the rear guide plate 17. The second cover 45 has a plate shape having substantially the same thickness as the guide plates 16, 17 and the like, and is formed in an arc shape so as to fit into the gap portion. A through hole is provided. The second cover 45 is located between the tip of the L-shaped lever 36 and the feed base 21 so that the pin 44 is inserted through the insertion hole.
4 and the square top 43 and, consequently, the arrow C
It is mounted so as to swing in the direction (sliding on the upper plate portion 12a). At this time, the rear edge of the front guide plate 16 and the front edge of the rear guide plate 17 are
It is designed to be a guide for rocking. Further, in this case, the second cover 45 is configured to have a length that always covers the entire arc-shaped hole 19 even if the feed base 21 swings to the leftmost end. In the sewing machine constructed as described above, the pulse motors 29 and 37 are energized in accordance with a predetermined program in synchronization with the driving of the needle bar and the like. As described above, the linear lever 28 swings due to energization of the pulse motor 29, and the driving force of the linear drive mechanism 26 is thereby transmitted to the feed base 21 via the square top 33 and the pin 34 passing through the linear hole 18. To the feed bar 21 (and the presser arm 2).
2) moves in the front-back direction (arrow X direction). Further, the L-shaped lever 36 swings by energizing the pulse motor 37, and the driving force of the swing mechanism 27 is transmitted through the pin 44 and the square top 43 penetrating through the arc-shaped hole 19, and the feed base 21 is rotated. And the feed base 21 (and the presser arm 22) is moved in the left-right direction (arrow θ) around the pin 34 portion.
Direction). As a result, a sewing operation such as pattern sewing is performed while the work cloth held at the distal end of the feed table 21 and the presser arm 22 is freely moved in the front-rear and left-right directions. However, the straight hole 18 and the arc-shaped hole 19 necessary for moving the feed bar 21 in this manner are large enough to fit the fingers of the operator, and these are exposed to the outside. Is not desirable. However, in the present embodiment, the straight hole 18 is closed by the first cover 35 that moves back and forth integrally with the pin 34, and the arc-shaped hole 19 is
The linear hole 18 and the arcuate hole 19 are not exposed to the outside because the second cover 45 swings integrally with the fourth cover 45. In this case, the first cover 35 is
And the second cover 45 is configured to be longer in the curved direction with respect to the arc-shaped hole 19, so that the first and second
Even if the covers 35 and 45 move, the straight hole 18 and the arc-shaped hole 19 can be always closed. Therefore, according to the present embodiment, the provision of the first cover 35 and the second cover 45 allows the straight hole 18 and the arc-shaped hole 19 to be always closed, so that the safety is improved. It can be improved. In this case, the first cover 35 and the second cover 45 can be attached only by fitting the first cover 35 and the second cover 45 into the pins 34 and the pins 44 constituting the transmission member. It can be done with a simple mounting structure. In addition, in the present embodiment, especially, the rising portion 13
Since the slit 46 is provided in the front wall portion 13a and used as a guide for the first cover 35, a guide can be provided without adding a separate component. further,
The front guide plate 16 and the rear guide plate 17 are provided in two parts,
Since the second cover 45 is provided in these gaps, the guide plates 16, 17 can be used as guides for the second cover 45, and the second cover 45 is placed on the guide plate. It is also possible to prevent the thickness from increasing as compared with the case where it is provided in a mounting state. The present invention is not limited to the embodiment described above and shown in the drawings. For example, various modifications can be made to the structure of the drive mechanism and the transmission member, for example, without departing from the scope of the invention. It can be carried out by appropriately changing it. As is apparent from the above description, according to the sewing machine of the present invention, there is provided a sewing machine having a straight hole and an arc-shaped hole necessary for moving a feed base on a sewing machine bed. By providing the first cover and the second cover, the straight hole and the arc-shaped hole can be always closed, and an excellent practical effect of improving safety can be achieved. It is.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment of the present invention, and is a plan view showing a structure of a feed base and a peripheral portion thereof with an upper cover removed. FIG. [FIG. 3] A plan view of the sewing machine main body with an arm portion removed. [FIG. 4] A side view of the sewing machine main body with a partly vertical section. [FIG. 5] A schematic view of the sewing machine main body. [FIG. 6] FIG. 5 corresponding to FIG. 5 showing a conventional example [Description of References] In the drawings, 11 is a sewing machine main body, 12 is a sewing machine bed, and 12 is a sewing machine bed.
a is an upper plate, 16 is a front guide plate, 17 is a rear guide plate, 1
8 is a straight hole, 19 is an arc-shaped hole, 21 is a feed stand, 21a is an upper cover, 26 is a linear drive mechanism, 27 is a swing mechanism, 28
Is a linear lever, 39 is a pulse motor, 33 is a square top,
34 is a pin, 35 is a first cover, 36 is an L-shaped lever, 37 is a pulse motor, 42 is a concave groove, 42a is an elongated hole, 43 is a square frame, 44 is a pin, 45 is a second cover,
46 denotes a slit.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-4-75684 (JP, A) JP-A-5-321124 (JP, A) JP-A-5-192468 (JP, A) JP-A-51- 59561 (JP, A) JP-A-64-34395 (JP, A) JP-A-62-204576 (JP, U) JP 1-38516 (JP, B2) JP 4-11237 (JP, B2) Japanese Patent Publication 2-15236 (JP, B2) Jikken 48-5513 (JP, Y1) (58) Field surveyed (Int. Cl. ⁷ , DB name) D05B 1/00-97/12

Claims (1)

(57) [Claim 1] A feed base movably arranged on a sewing machine bed for holding and moving a work cloth, and a straight hole extending in a front-rear direction provided on an upper surface portion of the sewing machine bed. An arc-shaped hole provided in an upper surface portion of the sewing machine bed and extending in a curved direction in a horizontal direction; a linear drive mechanism disposed in the sewing machine bed for moving the feed base in a front-rear direction; A swing mechanism disposed in the swing mechanism for swinging the feed table in a lateral direction; a first transmission member for transmitting a driving force of the linear drive mechanism to the feed table through the linear hole; A second transmission member for transmitting a driving force of a mechanism to the feed base through the arc-shaped hole;
A first cover that integrally moves with the transmission member in the front-rear direction and always closes the upper surface of the linear hole;
Draft thereby and a second cover, the upper surface of the sewing machine bed, said feed table slides to be integrally swung with the transmission member of the closure is always an upper surface of the arcuate hole
The inner plate has an arc-shaped gap including the arc-shaped hole between each other.
And the second cover is provided in two parts.
Characterized in that it is provided at the gap.
That sewing machine.