JPH0858Y2 - sewing machine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention simplifies the drive mechanism as much as possible and enables full-fledged sewing work by using the upper thread and the lower thread, so that children can use it. The present invention relates to a sewing machine that can sufficiently withstand the use of.

[Conventional technology]

Conventionally, the structures of the drive mechanism and the cloth feed mechanism for driving the shuttle mechanism in the sewing machine are generally very complicated,
It is not easy to manufacture because it has a large number of parts, and if it is mishandled, it easily breaks down, and it is not suitable for use by children who are at least unfamiliar with handling.

[Problems to be solved by the device]

Each of the sewing needle, the balance, and the hook mechanism operates by timing and timing, and the drive mechanism that transmits the driving force to these members also performs timing work for timing when the number of parts is large and complicated. There was a problem that it became difficult and caused a failure.

The cloth feeding mechanism is also similar to the above, and a simplified linkage mechanism has been desired in order to accurately feed the cloth at the correct timing in cooperation with the sewing needle and the hook mechanism.

[Means for solving the problem]

The present invention has been made in consideration of the above problems and objects, and a main drive shaft is linked to a balance and a sewing needle so as to operate in synchronization, and the drive shaft linked to the main drive shaft is located inside the bed. A horizontal rotary hook connected to the base end of a sliding plate slidably mounted and rotatably supported on the bed engages with a rack formed on the sliding plate and adjusts the balance and the sewing needle. It is formed so that the cloth feeding mechanism operates by the sliding operation of the sliding plate.

And the operating plate with the feed dog facing the opening of the needle plate is
It engages with the cam projection of the rotating plate that rotates due to the sliding operation of the sliding plate and moves upward, and the pin fitted into the guide groove of the sliding plate moves in the longitudinal direction of the operating plate to feed the cloth. Is to do.

Further, a rotating piece having a through hole communicating with the guide hole is pivotally attached to the upper surface of the guide hole of the sliding plate, and the rotating piece is rotated by operating a knob to operate. By changing the inclination direction of the guide groove that regulates the moving direction of the plate, it is possible to perform cloth feed that enables "reverse stitching".

[Action]

The balance and the sewing needle are operated in cooperation with the main drive shaft, and the shuttle mechanism is operated in rotation in cooperation with a sliding plate which is slidingly connected with the drive shaft to which the driving force is transmitted by the main drive shaft. The scale, the sewing needle, and the hook mechanism operate by being timed and timed.

Further, the sliding plate operates the cloth feed mechanism, and the operating plate with the feed dog facing the opening of the needle plate engages with the rack and the guide hole of the sliding plate to move the upper and lower and the operating plates. The cloth can be fed by moving in the longitudinal direction.

Further, the cloth feeding mechanism is provided so that the moving direction of the operating plate, that is, the cloth feeding direction can be selected by changing the inclination direction of the guide hole of the sliding plate.

〔Example〕

 An embodiment of the present invention will be described with reference to the drawings.

FIG. 1 shows the internal structure of the main body 1 as seen through it. The main body 1 has a substantially U-shaped cross section, and a bed portion 2 is formed in the lower portion. The motor 3 is fixed to the standing body of the main body 1 and is connected to the battery housed in the main body 1 and a power switch (both not shown). A transmission gear train composed of a plurality of gears meshes with a motor pinion of the motor 3, and a tip end side of the transmission gear train meshes with a gear 5 axially attached to an end of a main drive shaft 6.
The main drive shaft 6 is installed in the upper housing of the main body 1, and a link member 8 is pivotally attached to the tip portion thereof. The base end of the link member 9 and the bottom end of the balance 13 are rotatably supported at the tip of the link member 8. The tip of the link member 9 is rotatably fitted to the tip of the support shaft 10 protruding from the sewing needle mounting member 11, and the sewing needle 12 is detachably attached to the lower end of the sewing needle mounting member 11. Then, at the tip of the protruding piece 15 protruding from the bent portion in the center of the balance 13, the support shaft 15a,
15a is provided in a protruding manner, the support shafts 15a, 15a are rotatably supported in the main body 1, and the balance 13 is rotatable about the support shafts 15a, 15a. The tip of the thread 13 of the thread 13 of the balance 13 provided with the threading hole 14 projects from the side surface of the main body 1. When the main drive shaft 6 makes one revolution, the operation and timing of the sewing needle 12 and the hook raising mechanism described later are measured. It is configured to move up and down in time. The sewing needle 12 is connected to the link member 8 via the link member 9, and is configured to move up and down in synchronization with the balance 13 and the shuttle mechanism when the main drive shaft 6 makes one rotation.

A crown gear 7 is rotatably mounted on the middle portion of the main drive shaft 6, and the crown gear 7 meshes with a gear 16 rotatably mounted on the upper end of a drive shaft 17 rotatably installed in the standing body of the main body 1. There is. A link member 18 is pivotally attached to the lower end of the drive shaft 17, and a pin 19 is projectingly provided on the lower surface of the link member 18. The pin 19 is fitted in a long hole 21 formed at the base end of a sliding plate 20 slidably arranged in the bed 2.

As shown in FIG. 2, the sliding plate 20 is formed in a rectangular flat plate shape, and a long hole 22 is formed in the longitudinal direction on the base end side. A seated screw 23 screwed to the bottom plate of the bed 2 is fitted into the long hole 22, and the sliding plate 20 is slidably arranged. Further, a long hole 22 is formed in the longitudinal direction of the central portion of the sliding plate 20.
The support shaft 32 of the outer pot 30 rotatably erected on the bottom plate of the bed 2 is fitted into the elongated hole 22a. A ridge 24 is provided upright along the side edge of the long hole 22a, and a rack 25 is formed on the long hole 22a side of the ridge 24. The rack 25 meshes with a gear 33 that is pivotally attached to a support shaft 32, and when the sliding plate 20 slides, the outer hook 30 rotates clockwise or counterclockwise by a predetermined angle.

Below the sliding plate 20, a rotating plate 46 having a central portion rotatably supported is pivotally supported. Standing pieces are formed on both ends of the rotating plate 46, and the cam projections 4 are formed on the tip portions of the standing pieces.
7,47 are projected. Further, a pair of guide protrusions 41, 41 is provided upright on the outside of both ends of the rotating plate 46, and slot holes 42, 42 are vertically formed in the center of the guide protrusions 41, 41. It is set up. An operating plate 43 is fitted into the groove holes 42, 42 from above, and the operating plate 43 is loosely fitted in the groove holes 42, 42 and is movably supported in the vertical direction and in the longitudinal direction of the operating plate 43. And
A feed dog 44 is projectingly provided on an upper portion of the operating plate 43, and the feed dog 44 can freely project from and retract into an upper surface of the needle plate 48 through an opening 49 formed in the needle plate 48, and a longitudinal direction of the opening 49. It is provided to be movable. Further, a pin 45 is hung down from the lower end of the operating plate 43, and the pin 45 is fitted in a guide hole 26 that is formed by being inclined at a predetermined angle with respect to the longitudinal direction of the sliding plate 20. There is. Then, when the sliding plate 20 slides in the leftward direction in the second illustration (the state where the leftmost limit is reached is shown in FIG. 2), the rotating plate 46 projects to the side surface of the sliding plate 20. Engage with the provided protrusion 27,
It rotates in the counterclockwise direction shown in FIG. 2 with the central support shaft as the fulcrum. By the rotation operation of the rotation plate 46, the operation plate
The lower end of 43 rides on the cam protrusion 47 of the rotating plate 46 and moves upward. Then, the pin 45 moves along the inclination of the guide hole 26 of the sliding plate 20 so that the operating plate 43 moves in the direction of the arrow shown in FIG. 2 (in FIG. 2, the operating plate 43 reaches the movement limit). The state is shown.) The feed dog 44 feeds the cloth on the needle plate 48 in a predetermined direction. Then, when the sliding plate 20 slides in the rightward direction from the state of reaching the leftward limit in the second illustration, the rotating plate 46 engages with the protrusion 28 protruding laterally of the sliding plate 20 and the center thereof. It rotates in the clockwise direction shown in FIG.
At this time, the operating plate 43, which has been moved upward by engaging the cam projections 47, 47 at its lower end, is moved downward because the engagement with the cam projections 47, 47 is released, and the feed dog 43 is opened by the opening 49. It will retreat inside. Then, the operation plate 43 is moved upward by the pin 45 fitted in the guide hole 26 in the second illustration.

Outer hook that rotates by meshing with the rack 25 engraved on the sliding plate 20
A sword tip 31 is formed on the outer peripheral edge of 30. A notch 38 is formed inside the sword tip 31, and an outer hook is provided inside the outer hook 30.
The inner hook 34, of which the outer peripheral edge is in sliding contact with the inner peripheral surface of 30, is fitted.
An inner hook 35 is formed at the center of the inner hook 34, and a bobbin 36 around which a lower thread 37 is wound is housed inside the inner hook 35. The restraining plate 39 is fixed to the bed portion 2, and the tip end portion thereof engages with the upper surface of the inner hook 34 to prevent the inner hook 34 from deviating and rotating.

Next, a state in which the balance 13, the sewing needle 12, the outer hook 30, and the feed dog 44 operate in synchronization with each other will be described with reference to the motion curve diagrams of FIGS. 7 and 10.

The horizontal axis of FIG. 10 shows the rotation angle of the main drive shaft 6, and the vertical axis omits the display of specific numerical values, but the operating values of the above-mentioned members are displayed by angle and length. It is supposed to be done. The vertical movement of the sewing needle 12 is indicated by the movement curve 12a, and the horizontal axis at this time indicates the position of the needle plate 48. In addition, the vertical movement of the tip of the balance 13 is a movement curve.
It is shown by 13a. The rotation operation of the outer hook 30 is shown by the movement curve 30a.
Is measured based on the rotation direction of the outer hook 30 with a straight line connecting the sewing needle 12 and the support shaft 32 of the outer hook 30 as a reference line. The rising movement curve 30a indicates that the outer hook 30 is rotating clockwise, and the falling movement curve 30a indicates that the outer hook 30 is rotating counterclockwise. Then, the movement curve 13a of the balance 13 is a measurement of the length from the needle plate 48, the length of the lower limit of movement is 48 mm from the upper surface of the needle plate 48,
The upper limit of movement is 139 mm from the upper surface of the needle plate 48. The movement curve 44a of the feed dog 44 indicates the timing at which the feed dog 44 moves upward and moves to feed the cloth.

FIG. 7A corresponds to the state shown by the chain line A in FIG. 10, and the sewing needle 12 reaches the upper limit of movement of 7 mm from the upper surface of the needle plate 48. Then, the sword point 31 returns slightly clockwise from the rotation limit of 270 degrees in the counterclockwise direction from the reference line and is at a position of 240 degrees. Then, the balance 13 is in the process of rising and is tightening the upper thread 50. 7B corresponds to the state shown by the chain line B in FIG. 10, and the sewing needle 12 reaches the lower limit of 18 mm below the needle plate 48. Then, the sword tip 31 is slightly rotated counterclockwise from the rotation limit of 90 degrees in the clockwise direction from the reference line and is at the position of 70 degrees. Then, the balance 13 is in the process of descending and supplies the needle thread 50 to the sewing needle 12. Figure 7C shows
This corresponds to the state shown by the chain line C in FIG.
Is rising from the lower limit and is in the process of upward movement. The sword tip 31 is on the reference line and rotates counterclockwise. Then, the balance 13 is in a downward movement state, and the loosened upper thread 50 forms a loop 50a in front of the sword tip 31. FIG. 7D corresponds to the state shown by the chain line D in FIG.
12 is below the needle plate 48 and is in the process of upward movement. Then, the sword tip 31 hooks the loop 50a, rotates counterclockwise, and is at a position of 140 degrees from the reference line. And the balance 1
3 is moving down near the lower limit. When the sword tip 31 reaches around 270 degrees, which is the counterclockwise rotation limit, the upper thread 50
The loop 50a passes through the inner hook 34 and comes off. FIG. 7E corresponds to the state shown by the chain line E in FIG. 10, and the sewing needle 12 is above the needle plate 48 and is in the process of downward movement. And the sword tip 31 is rotating clockwise,
It is located at 130 degrees from the reference line. Then, the balance 13 is at the upper limit position, and the upper thread 50 is tightened upward and the lower thread is
37 and the cloth are sewn together. (Refer to FIG. 9) In FIG. 8, the cloth to be sewn is removed and the upper thread 50 and the lower thread 37 are removed.
It shows the relationship of.

The motion curve 44a shown in FIG. 10 shows the operating state of the feed dog 44. The operating plate 43 having the feed dog 44 formed on the upper portion is the sewing needle 12
When the needle has moved up to the vicinity of the upper surface of the needle plate 48, it engages with the cam protrusions 47, 47 formed at both ends of the rotary plate 46 and moves upward, and the sewing needle 12
Slides to a height of 5 mm above the upper surface of the needle plate 48, the sliding plate 20
The operating plate 43 is moved in the longitudinal direction by the pin 45 fitted in the guide hole 26, and the feed dog 44 performs the cloth feeding operation while protruding upward from the opening 49. This "feed section" is shown by the arrow in FIG. 10, and is fed until the sewing needle 12 moves downward near the upper surface of the needle plate 48. Then, when the rotary plate 46 rotates clockwise in the second illustration, the cam projection 4
The operating plate 43 disengaged from the 7, 47 moves downward, and the feed dog 44 also retracts into the opening 49. Then, the operating plate 43 returns to the original position again due to the inclined surface of the guide hole 26.

Next, a cloth feed mechanism that enables “reverse stitching” will be described with reference to FIGS. 11 and 12.

The drive mechanism of the sewing machine is the same as that of the above-described embodiment, and is configured by changing the shape of the guide hole 26 formed in the sliding plate 20 and attaching some operating members. That is, the sliding plate 20
A linear guide hole 26c is formed in the longitudinal direction of
The base end side of the guide hole 26c communicates with the apex of the through hole 26d having a substantially isosceles triangular shape. Then, the guide hole 26c and the through hole 26d
On the upper surface of the sliding plate 20 having the holes
A rotating piece 51 that is rotatably supported is provided on the. The turning piece 51 is provided with a substantially rhombic through hole 52 which is connected to the guide hole 26c and the through hole 26d so as to overlap with each other. A pin 54 is provided upright at the end of the rotating piece 51. This pin 54
The connecting rod 55 is fitted in the double bent portion 56. The connecting rod 55 is formed in a crank shape as a whole, and is rotatable by pivotally supporting the support shaft portion 55a on the base end side on the main body 1.
A push spring 58 is mounted on the bent portion 57 on the base end side, and the lower surface of the knob 59 protruding from the main body 1 is provided on the opposite side of the bent portion 57 to which the push spring 58 is pressed. Abutting. A projection 60 is provided on the lower surface of the knob 59. When the knob 59 is slid in the leftward direction shown in FIG. 12, the bent portion 57 is projected.
By engaging with 60, the tip bent portion 56 of the connecting rod 55 rotates counterclockwise in the twelfth illustration with the support shaft 55a as a fulcrum, and the knob 59 slides in the rightward direction in the twelfth illustration. When moved, the bent portion 57 disengages from the protrusion 60, so that the tip bent portion 56 of the connecting rod 55 is rotated clockwise by the elastic force of the pressing spring 58 as shown in FIG. . Therefore, the bent portion 56
The rotating piece 51, into which the pin 54 is fitted, rotates in the left-right direction with the support shaft 53 as a fulcrum. Then, the rotating operation of the rotating piece 51 is performed by the sliding plate.
It is regulated by a pair of stopper protrusions 20a, 20a protruding on the 20. And in FIG. 11A, the bent portion 56 is
The state of the turning piece 51 when turning clockwise in the drawing is shown. The guide hole at this time is formed by the guide hole 26c, the inner end edge 26b of the through hole 26d, and the inner end edge 52a of the through hole 52, and a guide hole having an inclined surface whose right side is lowered is formed. In this state, the feed dog 44 feeds the cloth in the direction of the arrow N, and FIG. 11B shows the bent portion.
The state of the turning piece 51 when 56 is turned counterclockwise in FIG. 12 is shown. The guide hole at this time is guide hole 26c.
A guide hole is formed by the inner end edge 26a of the through hole 26d and the inner end edge 52b of the through hole 52, and has a sloping surface on the right side. In this state, the feed dog 44 feeds the cloth in the direction of the arrow M, and the cloth which has been sewn once is fed in the reverse direction so that "reverse stitching" can be performed. .

9. FIG. 9 is a cross-sectional view of the stitched portion of the present invention where the cloth is stitched with the sewing machine, and 50 is the upper thread 37 and the lower thread.

[Effect of device]

The present invention is configured as described above and has the following effects.

The sewing needle and the balance are actuated by being timed by the main drive shaft, and the shuttle mechanism and the cloth feed mechanism are actuated by the sliding plate which is linked to the drive shaft to which the driving force is transmitted by the main drive shaft. . The hook mechanism and the cloth feed mechanism may be set in coordination with the sliding operation of the sliding plate so as to operate in synchronism with the operation of the sewing needle and the balance. It is possible to provide a sewing machine that is easy to manufacture and handle.

Further, the operating plate with the feed dog facing the opening of the needle plate moves up and down in association with the sliding operation of the sliding plate and moves in the longitudinal direction of the operating plate. The cloth is fed by the movement in the longitudinal direction during the movement, and operates by adjusting the rotation angle of the main drive shaft. Therefore, the cloth feed operation can be reliably performed in synchronization with the vertical movement of the sewing needle.

Furthermore, when the feed dog is protruding above the opening of the needle plate, the cloth feed mechanism allows the movement direction of the operating plate to be selected, and the inclination direction of the guide hole formed in the sliding plate can be pinched. It is possible to change it by operating it and enable "reverse stitching".

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention. FIG. 1 is a perspective view showing the internal structure of a main body housing as seen through, and FIG. 2 shows a sliding plate and its related mechanism which are the main parts of a drive mechanism. The top view shown in FIG. 3, FIG. 3 is a longitudinal sectional view showing the main part of the drive mechanism, FIG. 4 is a sectional view taken along the line AA of FIG. 3, FIG. 5 is an exploded perspective view of the shuttle mechanism, and FIG. A top view of the mechanism, FIGS. 7A, B, C, D, E and FIG. 8 are explanatory views of the stitching operation by the hook mechanism and the needle, FIG. 9 is a sectional view of the stitched portion, and FIG. Figure, Figure 11A,
B is a top view of the cloth feed mechanism capable of "reverse stitching", and FIG. 12 is an exploded perspective view showing a main part of the cloth feed mechanism of FIG. 1 ... Main body, 2 ... Bed, 6 ... Main drive shaft, 12 ...
Sewing needle, 13 ... Balance, 17 ... Drive shaft, 20 ... Sliding plate, 24 ...
… Ridge, 25 …… Rack, 26 …… Guide hole, 30 …… Outer pot,
31 …… Sword tip, 43 …… Operating plate, 44 …… Feed tooth, 46 …… Rotating plate, 48 …… Sneedle plate, 51 …… Rotating piece, 59 …… Picking.

Claims (1)

[Scope of utility model registration request] 1. A balance which is coordinated with a main drive shaft 6 to operate in synchronization.
A drive shaft 17 including a sewing needle 13 and a sewing needle 12 and linked to the main drive shaft 6 is connected to a base end of a slide plate 20 slidably arranged in the bed portion 2 to project onto the slide plate 20. The rack 25 engraved on the provided ridge 24 meshes with a gear provided on a spindle 32 of a horizontal rotary hook composed of an outer hook 30 and an inner hook 34 rotatably supported by the bed portion 2, The sword point 31 provided on the outer hook 30 is the sewing needle
12 and the balance 13 are rotated in synchronization with the vertical movement of the balance 13, and the cloth feed mechanism is operated by the sliding operation of the sliding plate 20, and the feed dog 44 is provided in the opening 49 of the needle plate 48. The actuating plate 43 facing the guide piece 4 erected on the bed portion 2
The pins 45, which are movably supported in the vertical and longitudinal directions by the first and the fourth 41, and which are hung down on the operating plate 43, are inserted into the guide holes 26 inclined with respect to the longitudinal axis of the sliding plate 20. And the cam protrusions 47, 47 on both ends of the upper surface of the bed 2.
Is provided so as to be rotatable. The rotating plate 46 engages with the protrusions 27 and 28 protruding from the sliding plate 20 to move upward, The guide hole 26 is provided with a cloth feed mechanism that moves in the longitudinal direction of the operating plate 43, and further, the base end side of the guide hole 26c formed in the longitudinal direction of the sliding plate 20 has a substantially isosceles triangular through hole. A pivoting piece 51 is provided so as to communicate with the apex of 26d, and the guide hole 26c and the through hole 26d are provided with a through hole 52 on the upper surface thereof. The pin 45, which is rotatably provided in connection with the hole 55 and hangs down from the operating plate 43, is provided with the inner end edge 52a of the through hole 52 and the through hole 2.
A sewing machine provided with a cloth feed mechanism which is inserted into a guide hole formed by the inner end edge 26b or the inner end edge 52b and the inner end edge 26a of 6d and is movable to enable reverse stitching.