CN111926471B

CN111926471B - Needle feeding sewing machine

Info

Publication number: CN111926471B
Application number: CN201910394894.XA
Authority: CN
Inventors: 李瑛�; 曹根
Original assignee: Juki Corp
Current assignee: Juki Corp
Priority date: 2019-05-13
Filing date: 2019-05-13
Publication date: 2023-09-05
Anticipated expiration: 2039-05-13
Also published as: CN111926471A

Abstract

The invention provides a needle feeding sewing machine, which suppresses phase variation and adjusts the height of a feeding tooth. A needle feeding sewing machine (10) comprises: a sewing machine motor (13); a lower shaft (15) which is driven by a sewing machine motor in a rotating manner; an up-and-down feeding mechanism (40) which imparts up-and-down reciprocating motion to the feeding teeth (4); and a horizontal feed mechanism (60) which imparts a reciprocating back and forth motion along the feed direction of the sewing object to the feed teeth, wherein the needle feed sewing machine (10) comprises: an upper and lower feed shaft (41) that performs reciprocating rotation operation; an upper and lower crank mechanism (44) for transmitting reciprocating rotation motion from the lower shaft to the upper and lower feed shafts; an upper and lower feed arm (42) fixedly connected to the upper and lower feed shafts and reciprocally swinging together with the upper and lower feed shafts; and a height adjustment unit (50) for adjusting the height of the feed teeth by adjusting the angle of the upper and lower feed arms relative to the upper and lower feed shafts.

Description

Needle feeding sewing machine

Technical Field

The present invention relates to a needle feeding sewing machine for feeding a sewn object by a feeding tooth.

Background

Conventionally, a sewing machine uses a sewing machine motor as a driving source, an up-and-down feeding mechanism imparts a reciprocating motion in an up-and-down direction to a feeding tooth, and a horizontal feeding mechanism imparts a reciprocating back-and-forth motion in a horizontal direction (feeding direction) to the feeding tooth to perform a feeding motion of a workpiece on a needle plate.

The up-down feeding mechanism comprises: an upper and lower feed cam which is an eccentric cam arranged on a lower shaft for performing full rotation by a sewing machine motor; and a crank lever having one end supported by the up-down feed cam and the other end connected to one end of a feed table holding feed teeth (for example, refer to patent document 1).

An eccentric shaft is provided at a connecting portion between the crank lever and the feed table, and the height of the feed teeth is adjusted by rotating the eccentric shaft.

Patent document 1: japanese patent laid-open publication No. 2018-149248

However, the conventional sewing machine has a problem that if the height of the feed teeth is adjusted by the eccentric shaft, the phase also fluctuates along with the fluctuation of the height of the feed teeth.

That is, if the eccentric shaft is rotated, the crank lever swings around the up-and-down feed cam together with the variation in the height of the feed teeth, and this swing causes the variation in the phase of the up-and-down movement of the feed teeth with respect to the phase of the up-and-down movement of the needle.

Therefore, in the case of adjusting the height of the feed teeth, the phases of the feed teeth must be adjusted simultaneously, and the height adjustment work becomes complicated.

Disclosure of Invention

The present invention aims to suppress phase fluctuation during height adjustment of a feed tooth, and has any of the following features (1) to (4).

(1)

A needle feed sewing machine, comprising:

a sewing machine motor;

a lower shaft which is driven by the sewing machine motor in a rotating manner;

an up-and-down feeding mechanism for imparting up-and-down reciprocating motion to the feeding teeth; and

a horizontal feeding mechanism which imparts reciprocating back and forth motion along the feeding direction of the sewed object to the feeding teeth,

the needle feed sewing machine is characterized in that,

the horizontal feed mechanism has:

a horizontal feed shaft;

a horizontal crank mechanism for transmitting a reciprocating rotation motion from the lower shaft to the horizontal feed shaft; and

a horizontal feed wrist fixedly coupled to the horizontal feed shaft and having a swing end coupled to the feed teeth,

the up-down feeding mechanism comprises:

an upper and lower feed shaft which performs a reciprocating rotation motion;

an upper and lower crank mechanism for imparting a reciprocating rotation motion to the upper and lower feed shafts from the lower shaft;

an up-and-down feeding wrist fixedly connected to the up-and-down feeding shaft, and having a swinging end portion for imparting up-and-down movement to the feeding teeth; and

and a height adjusting section for adjusting the height of the feed teeth by adjusting the angle of the upper and lower feed arms with respect to the upper and lower feed shafts.

(2)

The needle feeding sewing machine according to the above (1), characterized in that,

the horizontal feed shaft, the lower shaft, and the upper and lower feed shafts are arranged in this order in plan view from the upstream side toward the downstream side in the feed direction of the object to be sewn.

(3)

The needle feeding sewing machine according to the above (1) or (2), characterized in that,

the upper and lower crank mechanism has: an upper and lower feed cam composed of an eccentric cam coupled to the lower shaft; an upper and lower feed lever having one end rotatably connected to the upper and lower feed cam; and an input wrist fixedly coupled to the upper and lower feed shafts, and having a swing end coupled to the other end of the upper and lower feed bars,

the needle feed sewing machine includes a vertical movement width adjusting unit that adjusts a vertical movement width of the feed gear by moving and adjusting a connection position between the other end portion of the vertical feed bar and the swing end portion of the input wrist along the input wrist.

(4)

The needle feeding sewing machine according to any one of the above (1) to (3), characterized in that,

the horizontal feed mechanism has a phase adjustment section for adjusting a phase of an axial angle of the feed teeth in a feed direction, the axial angle being a reciprocating back and forth motion relative to the lower shaft,

the horizontal crank mechanism has: a horizontal feed cam composed of an eccentric cam coupled to the lower shaft; a horizontal feed lever having one end rotatably coupled to the horizontal feed cam; an input wrist connected to the horizontal feed shaft; and a horizontal feed connecting link connecting the other end of the horizontal feed lever and the swing end of the input wrist,

the phase adjustment unit adjusts the phase of the reciprocating forward and backward motion of the feed teeth by adjusting the angle of the horizontal feed cam with respect to the lower shaft.

(5)

The needle feeding sewing machine according to the above (4), characterized in that,

has a feed amount adjusting mechanism which adjusts the feed interval,

the feed amount adjusting mechanism includes:

a slider rotatably holding a connecting portion of the horizontal feed rod and the horizontal feed connecting link;

a guide section having a guide groove along which the slider is slidably supported;

a slider block having the guide portion; and

a feed amount adjusting motor, the output shaft of which is connected with the slider block,

the feed pitch is adjusted by changing the direction of the guide groove by rotating the slider block by driving the feed amount adjustment motor and by changing the direction of movement of the connecting portion between the horizontal feed lever and the horizontal feed connecting link.

ADVANTAGEOUS EFFECTS OF INVENTION

As described above, according to the needle feed sewing machine of the present invention, the phase variation at the time of height adjustment of the feed teeth can be suppressed.

Drawings

Fig. 1 is an oblique view showing a structure related to feeding of a carrier needle and a sewn object of a needle feeding sewing machine according to an embodiment of the present invention.

Fig. 2 is an oblique view of the up-down feeding mechanism.

Fig. 3 is an oblique view of the horizontal feed mechanism.

Fig. 4 is an exploded perspective view of the horizontal feeding mechanism and the feeding amount adjusting mechanism.

Fig. 5 is an oblique view showing a state in which a horizontal feed wrist and a feed table are coupled by a horizontal feed eccentric pin.

Fig. 6 is an oblique view of a horizontal feed eccentric pin.

Fig. 7 is an oblique view of the up-down feeding mechanism as a comparative example.

Fig. 8 is a diagram showing a movement locus of the feed tooth in the case where the height of the feed tooth is adjusted by the height adjusting section of the up-down feed mechanism as an embodiment.

Fig. 9 is a diagram showing a movement locus of the feed tooth in the case where the height of the feed tooth is adjusted by the adjusting pin of the up-down feed mechanism as a comparative example.

Fig. 10 is a diagram showing a movement locus of the feed tooth in the case where the vertical movement amplitude adjustment of the feed tooth is performed by the vertical movement amplitude adjustment section of the vertical feed mechanism.

Fig. 11 is a diagram showing a movement locus of the feed tooth in the case where the phase of the reciprocation in the front-rear direction is adjusted by the phase adjustment section, fig. 11 (a) shows a state before adjustment, fig. 11 (B) shows a state in which the phase is advanced by 10 °, fig. 11 (C) shows a state in which the phase is advanced by 20 °, fig. 11 (D) shows a state in which the phase is retarded by 10 °, and fig. 11 (E) shows a state in which the phase is retarded by 20 °.

Description of the reference numerals

4. Feed tooth

5. Feeding table

10. Needle feeding sewing machine

11. Sewing needle

12. Needle bar

13. Sewing machine motor

14. Needle plate

15. Lower shaft

16. Upper shaft sprocket

17. Lower shaft sprocket

18. Synchronous belt

20. Needle up-down moving mechanism

21. Upper shaft

22. Needle bar crank

23. Rod holding part

24. Needle bar crank lever

30. Needle feeding mechanism

31. Needle bar swinging table

32. Swing axle

33. Input wrist

34. Output wrist

35. Connecting rod

40. Up-down feeding mechanism

41. Upper and lower feeding shaft

42. Up-down feeding wrist

421. Screw bolt

43. Connecting rod for up-down feeding

44. Upper and lower crank mechanism

45. Up-down feeding cam

46. Up-down feeding rod

47. Input wrist

471. Long hole

48. Stepped screw

49. Up-down movement amplitude adjusting part

50. Height adjusting part

60. Horizontal feeding mechanism

61. Horizontal feed shaft

62. Horizontal feeding wrist

63. Horizontal feeding connecting rod

64. Horizontal crank mechanism

65. Horizontal feed cam

651. Screw bolt

66. Horizontal feed rod

67. Input wrist

69. Phase adjusting part

80. Feed amount adjusting mechanism

81. Sliding body

82. Guide part

83. Slider block

84. Feed amount adjusting motor

85. Rotary wrist

86. Feed amount adjusting connecting rod

Detailed Description

[ overall structure of embodiment ]

Next, an embodiment of the present invention will be described in detail with reference to fig. 1 to 11. In this embodiment, a double needle feeding sewing machine will be described as an example. The needle feeding sewing machine is, for example, a sewing machine capable of feeding a workpiece such as a thick workpiece at a set pitch while a needle of a needle bar is oscillated in synchronization with a feeding tooth, and feeding the workpiece at the set pitch while a needle is penetrated.

In the following description, a horizontal direction along a feed direction of a sewing object is defined as an X-axis direction (front-rear direction), a horizontal direction orthogonal to the X-axis direction is defined as a Y-axis direction (left-right direction), and a direction orthogonal to both the X-axis direction and the Y-axis direction is defined as a Z-axis direction (up-down direction). The downstream side in the feeding direction is referred to as "front", the upstream side is referred to as "rear", the left-hand side is referred to as "left" and the right-hand side is referred to as "right" in a state of being directed to the front.

Fig. 1 is an oblique view showing a structure of a needle feeding sewing machine 10 related to the feeding of a needle and a sewn object. As shown in fig. 1, a needle feeding sewing machine 10 (hereinafter, simply referred to as a sewing machine 10) includes: a sewing machine motor 13 as a driving source for sewing operation; a needle up-and-down movement mechanism 20 for imparting an up-and-down movement to the two needle bars 12 holding the two needles 11 individually; a needle feeding mechanism 30 that swings the two needle bars 12 in the X-axis direction; a lower shaft 15; an up-and-down feeding mechanism 40 for moving up-and-down the feeding teeth 4 in the Z-axis direction; a horizontal feeding mechanism 60 that reciprocates the feeding teeth 4 in the X-axis direction; a feed amount adjustment mechanism 80 for adjusting a feed amount of the object to be sewn for each needle, that is, a sewing pitch; and a needle plate 14.

Although not shown, the sewing machine 10 further includes a sewing machine frame, a pot mechanism, a take-up lever mechanism, a thread adjuster device, and other structures necessary for sewing, but these structures are well known structures and therefore, the description thereof is omitted.

[ mechanism for moving needle up and down ]

The needle up-and-down movement mechanism 20 includes: an upper shaft 21 to which the sewing machine motor 13 is applied full rotation (continuous rotation in a predetermined direction); a needle bar crank 22 provided at one end of the upper shaft 21; needle bar holding portions 23 for holding the two needle bars 12; and a needle bar crank lever 24 that connects the needle bar crank 22 and the needle bar holding portion 23.

If the needle bar crank 22 rotates together with the upper shaft 21, the needle bar crank lever 24 converts the rotational motion into up-and-down reciprocating motion and transmits the up-and-down reciprocating motion to the needle bar holding portion 23. Thereby, the needle bar 12 moves up and down according to the number of rotations of the sewing motor 13.

[ needle feeding mechanism ]

The needle feeding mechanism 30 includes: a needle bar swinging table 31 for supporting the two needle bars 12 so as to be movable up and down; a swing shaft 32 that swingably supports the needle bar swing table 31 around the Y axis; an input wrist 33 for inputting a reciprocating rotation motion to the swing shaft 32; an output wrist 34 fixedly coupled to an end of a horizontal feed shaft 61 of a horizontal feed mechanism 60 described later; and a connecting link 35 that connects the output wrist 34 and the input wrist 33.

The two needle bars 12 need to swing so that the needle 11 moves forward and backward in synchronization with the forward and backward movement of the feed teeth 4.

Accordingly, the horizontal feed shaft 61 and the swing shaft 32 are coupled to each other via the output wrist 34, the coupling link 35, and the input wrist 33, so that the horizontal feed shaft 61 and the swing shaft 32 of the horizontal feed mechanism 60 that imparts a reciprocating motion in the front-rear direction (X-axis direction) to the feed teeth 4 are rotated in synchronization with each other.

Thereby, the needle bar rocking stage 31 is rocked in synchronization with the feed teeth 4, and the needle 11 located at the tip of each needle bar 12 moves in the feed direction together with the feed teeth 4.

The needle up-and-down moving mechanism 20 and the needle feeding mechanism 30 are disposed in a sewing machine arm portion and a longitudinal machine body portion of a sewing machine frame, not shown.

[ lower shaft ]

The lower shaft 15 is rotatably supported in a sewing machine base portion of a sewing machine frame, not shown, in a state of being along the Y-axis direction.

The lower shaft 15 rotates in conjunction with the upper shaft 21 at a constant speed by a timing belt 18 provided between an upper shaft sprocket 16 provided on the upper shaft 21 and a lower shaft sprocket 17 provided on the lower shaft 15.

The left end portion of the lower shaft 15 is engaged with a tank mechanism, not shown, and power is input to the tank mechanism.

[ vertical feed mechanism ]

Fig. 2 is an oblique view of the up-down feeding mechanism 40. The up-down feeding mechanism 40 is disposed in a sewing machine base portion, not shown.

As shown in fig. 1 and 2, the up-down feeding mechanism 40 includes: an upper and lower feed shaft 41 which reciprocates in the Y-axis direction; an upper and lower crank mechanism 44 for transmitting a reciprocating rotation motion from the lower shaft 15 to the upper and lower feed shafts 41; an upper and lower feed arm 42 fixedly coupled to the upper and lower feed shaft 41 and reciprocally swinging together with the upper and lower feed shaft 41; and an up-and-down feed connecting link 43 connecting the front end portion of the feed table 5 holding the feed teeth 4 and the swing end portion of the up-and-down feed wrist 42.

The up-down crank mechanism 44 includes: an upper and lower feed cam 45 composed of an eccentric cam fixedly coupled to the lower shaft 15; an up-and-down feed lever 46, one end of which is rotatably coupled to the up-and-down feed cam 45; and an input wrist 47 fixedly coupled to the upper and lower feed shafts 41 and input to reciprocate from the upper and lower feed bars 46.

The upper and lower feed cams 45 are outer peripheral cams having a circular outer periphery, the lower shaft 15 penetrates the eccentric position, and the upper and lower feed cams 45 are fixed to the lower shaft 15.

The upper and lower feed levers 46 hold the outer periphery of the upper and lower feed cams 45 via radial bearings, not shown, at one end portions thereof, and the upper and lower feed cams 45 are rotatable relative to the upper and lower feed levers 46. Therefore, if the up-and-down feed cam 45 rotates together with the lower shaft 15, one end of the up-and-down feed lever 46 revolves around the lower shaft 15 according to the eccentric amount of the up-and-down feed cam 45.

On the other hand, the input wrist 47 is fixedly supported at one end portion thereof at the right end portion of the upper and lower feed shafts 41 in the Y-axis direction, and swings around the upper and lower feed shafts 41. Further, a long hole 471 extending in the longitudinal direction of the input wrist 47 (radial direction around the upper and lower feed shafts 41) is formed at the swing end of the input wrist 47, and the other end of the upper and lower feed levers 46 is rotatably coupled around the Y-axis by a step screw 48 passing through the long hole. The extending direction of the input wrist 47 and the extending direction of the other end portion of the up-down feed lever 46 are preferably substantially orthogonal.

Thus, if one end portion of the up-down feed lever 46 is rotated by the rotation of the lower shaft 15, the reciprocating swing motion is input to the swing end portion of the input wrist 47 through the other end portion of the up-down feed lever 46, and the input wrist 47 and the up-down feed shaft 41 integrally perform the reciprocating rotation motion at a cycle equal to the rotation cycle of the lower shaft 15.

An upper and lower feed arm 42 is held and fixed at the left end portion of the upper and lower feed shaft 41, and the upper and lower feed arm 42 is capable of swinging integrally with the upper and lower feed shaft 41. The swing end of the up-down feed arm 42 is rotatably connected to one end of the up-down feed connecting link 43 about the Y axis, and the other end of the up-down feed connecting link 43 is rotatably connected to the front end of the feed table 5 about the Y axis.

Further, the vertical feed arm 42 has a swing end portion extending substantially rearward, and the swing end portion reciprocates in the vertical direction.

Therefore, if a reciprocating rotation operation is input from the lower shaft 15 to the upper and lower feed shafts 41 via the upper and lower crank mechanisms 44, the swing end of the upper and lower feed arm 42 reciprocates in the up and down direction, and a reciprocating up and down movement is imparted to the feed table 5 and the feed teeth 4 via the upper and lower feed connecting link 43.

The step screw 48 that connects the input wrist 47 and the up-down feed lever 46 can move along the long hole 471 if the fastened state is loosened, and the connection position of the up-down feed lever 46 can be adjusted along the longitudinal direction (arrow S direction) of the input wrist 47. This allows the reciprocating rotation angle imparted to the upper and lower feed shafts 41 from the lower shaft 15 to be adjusted in an increasing or decreasing manner, and also allows the vertical movement width of the feed teeth 4 to be adjusted. That is, the input wrist 47 and the step screw 48 constitute an up-down movement width adjusting section 49 for adjusting the up-down movement width of the feed gear.

The upper and lower feed arms 42 are held and fixed by screws 421 with respect to the upper and lower feed shafts 41. Therefore, if the screw 421 is loosened, the up-down feed wrist 42 can be rotated with respect to the up-down feed shaft 41, and the shaft angle thereof can be rotationally adjusted along arrow H. Thus, if the vertical feed shaft 41 is fixed and the vertical feed arm 42 is adjusted to rotate, the feed table 5 and the feed teeth 4 are moved vertically via the vertical feed link 43, and the height thereof can be adjusted. That is, the holding structure of the up-down feed arm 42 and the screw 421 constitute a height adjusting section 50 for adjusting the height of the feed teeth 4.

[ horizontal feeding mechanism ]

Fig. 3 is an oblique view of the horizontal feeding mechanism 60, and fig. 4 is an exploded oblique view of the horizontal feeding mechanism 60 and the feeding amount adjusting mechanism 80. The horizontal feeding mechanism 60 is disposed in a sewing machine base portion, not shown.

As shown in fig. 1, 3 and 4, the horizontal feeding mechanism 60 includes: a horizontal feed shaft 61 in the Y-axis direction, which performs a reciprocating rotation motion; a horizontal crank mechanism 64 for transmitting a reciprocating rotation motion from the lower shaft 15 to the horizontal feed shaft 61 via a feed amount adjustment mechanism 80 described later; and a horizontal feed arm 62 fixedly coupled to the horizontal feed shaft 61 and reciprocally swinging together with the horizontal feed shaft 61.

In addition, the horizontal crank mechanism 64 has: a horizontal feed cam 65 constituted by an eccentric cam fixedly coupled to the lower shaft 15; a horizontal feed lever 66, one end of which is rotatably coupled to the horizontal feed cam 65; an input wrist 67 fixedly coupled to the horizontal feed shaft 61 and input to be reciprocated from the horizontal feed lever 66; and a horizontal feed connecting link 63 connecting the other end of the horizontal feed lever 66 and the swing end of the input wrist 67.

The horizontal feed cam 65 is an outer peripheral cam having a circular portion in the outer periphery, the lower shaft 15 penetrates the eccentric position, and the horizontal feed cam 65 is fixed to the lower shaft 15.

The horizontal feed lever 66 holds the outer periphery of the right circular portion of the horizontal feed cam 65 via a radial bearing, not shown, at one end portion thereof, and the horizontal feed cam 65 is rotatable with respect to the horizontal feed lever 66. If the horizontal feed cam 65 rotates together with the lower shaft 15, the other end of the horizontal feed lever 66 rotates around the lower shaft 15 according to the eccentric amount of the horizontal feed cam 65, and the other end of the horizontal feed lever 66 reciprocates up and down.

The other end of the horizontal feed lever 66 is connected to one end of the horizontal feed connecting link 63 so as to be rotatable about the Y axis.

On the other hand, the input wrist 67 is fixedly supported at one end portion thereof at the right end portion of the horizontal feed shaft 61 in the Y-axis direction, and swings around the horizontal feed shaft 61. The swing end of the input wrist 67 is extended upward, and is connected to the other end of the horizontal feed connecting link 63 so as to be rotatable about the Y axis.

A horizontal feed arm 62 is held and fixed at the left end portion of the horizontal feed shaft 61, and the horizontal feed arm 62 is capable of swinging integrally with the horizontal feed shaft 61. The swing end of the horizontal feed arm 62 is rotatably connected to the rear end of the feed table 5 by a horizontal feed eccentric pin 68 about the Y axis. As shown in fig. 5 and 6, the eccentric pin 68 includes a first shaft portion 681 and a third shaft portion 683 that are inserted into the horizontal feed arm 62, and a second shaft portion 682 that is inserted into the feed table 5, and the first shaft portion 681 and the third shaft portion 683 are formed concentrically, and only the second shaft portion 682 is eccentric. Therefore, if the horizontal feed eccentric pin 68 is rotated, the end of the feed table 5 on the horizontal feed arm 62 side is displaced upward and downward, and the inclination of the feed teeth 4 can be adjusted.

Further, the horizontal feed arm 62 has a swing end portion extending substantially upward, and the swing end portion reciprocates in the front-rear direction.

Therefore, if the reciprocating rotation operation is input from the lower shaft 15 to the horizontal feed shaft 61 via the horizontal crank mechanism 64, the swing end of the horizontal feed arm 62 reciprocates in the front-rear direction, and the feed table 5 and the feed teeth 4 are given the reciprocating front-rear movement.

The horizontal feed cam 65 is fixed to the lower shaft 15 by two flat head screws 651, and if these flat head screws 651 are loosened, the horizontal feed cam 65 can rotate relative to the lower shaft 15 and can adjust the shaft angle in the direction of arrow P. Thus, the phase of the reciprocating rotation operation imparted to the horizontal feed shaft 61 from the lower shaft 15 can be adjusted, and the phase of the horizontal operation of the feed teeth 4 can be adjusted. That is, the horizontal feed cam 65 and the flat head screw 651 constitute a phase adjustment unit 69 for adjusting the phase of the axial angle of the reciprocating forward and backward motion of the feed tooth 4 with respect to the lower shaft 15.

The horizontal feed arm 62 is held and fixed by a screw (not shown) with respect to the horizontal feed shaft 61. Therefore, if the screw is loosened, the horizontal feed wrist 62 can be rotated with respect to the horizontal feed shaft 61, and the shaft angle thereof can be rotationally adjusted along arrow F. Thus, if the horizontal feed shaft 61 is fixed and the horizontal feed arm 62 is rotated and adjusted, the feed table 5 and the feed teeth 4 are moved forward and backward, and the forward and backward positions thereof can be adjusted. That is, the holding structure and screws of the horizontal feed arm 62 constitute a horizontal position adjusting portion for adjusting the front-rear position of the feed tooth 4 with respect to the needle falling position.

[ feed amount adjusting mechanism ]

The feed amount adjusting mechanism 80 restricts the movement direction of the connecting portion between the horizontal feed lever 66 and the horizontal feed connecting link 63 of the horizontal feed mechanism 60, and adjusts the reciprocating rotation angle transmitted to the horizontal feed shaft 61 by changing the angle around the Y axis in the movement direction.

As shown in fig. 1 and 4, the feed amount adjusting mechanism 80 includes: a pair of sliders 81 (only one of which is shown) rotatably mounted on the joint portion between the horizontal feed lever 66 and the horizontal feed connecting link 63 about the Y axis; a pair of guide portions 82 slidably supporting the respective sliding bodies 81; a slider block 83 which holds the pair of guide portions 82 and is rotatably supported in the sewing machine base portion about the Y axis; a feed amount adjustment motor 84 that rotates the slider block 83 to an arbitrary rotation angle; a rotation wrist 85 attached to an output shaft of the feed amount adjustment motor 84 in the Y-axis direction; and a feed amount adjustment connecting link 86 connecting the rotating end of the rotation arm 85 and the slider block 83.

The slider body 83 has a substantially cylindrical shape, and the guide portions 82 are held such that guide grooves formed in the pair of guide portions 82 are substantially along the diameter direction of the slider body 83.

The pair of sliding bodies 81 are constrained to be slidably supported along a guide groove formed in the guide portion 82, and the coupling portion of the horizontal feed lever 66 and the horizontal feed coupling link 63 reciprocates along the guide groove. The guide groove is formed in an arc shape along the locus of rotation of the horizontal feed connecting link 63.

Further, if the slider block 83 is rotated by driving the feed amount adjustment motor 84 via the rotation wrist 85 and the feed amount adjustment connecting link 86, the orientation of the groove of the guide portion 82 is also rotated about the Y axis, and the moving direction of the connecting portion of the horizontal feed lever 66 and the horizontal feed connecting link 63 is also changed.

At this time, if the guide groove of the guide portion 82 is oriented in the direction close to the X axis, the range of the reciprocating rotation angle of the horizontal feed shaft 61 is widened, and the width of the reciprocating forward and backward movement in the feed direction of the feed teeth 4 is widened. More specifically, with respect to the position of the slider block 83 having a feed pitch of 0, if the slider block 83 is rotated counterclockwise when viewed from the left direction, the feed pitch in the forward feed direction increases, and if the slider block 83 is rotated clockwise when viewed from the left direction, the feed pitch in the reverse feed direction increases.

Further, if the slider block 83 is rotated so as to bring the guide groove of the guide portion 82 toward the Z-axis direction, the range of the reciprocating rotation angle of the horizontal feed shaft 61 becomes small, and the width of the reciprocating forward and backward movement in the feed direction of the feed tooth 4 becomes small, so that the feed pitch becomes close to 0.

[ Sewing action of Sewing machines ]

If the sewing motor 13 is driven, the needle up-and-down moving mechanism 20 moves the two needle bars 12 up and down to start sewing.

At this time, the lower shaft 15 is also rotated by the driving of the sewing machine motor 13, and the upper and lower feed shaft 41 is reciprocally rotated by the upper and lower crank mechanism 44 in the upper and lower feed mechanism 40. Thus, the feeding table 5 and the feeding teeth 4 are moved up and down by the up and down feeding wrist 42.

In the horizontal feed mechanism 60, the horizontal feed shaft 61 is reciprocally rotated by the horizontal crank mechanism 64. Thus, the feeding table 5 and the feeding teeth 4 are reciprocally moved back and forth by the horizontal feeding wrist 62.

By inputting the reciprocating up-and-down movement and the reciprocating back-and-forth movement to the feeding stage 5 in synchronization, the feeding teeth 4 can perform a long circular movement along the X-Z plane, and the object to be sewn on the needle plate 14 is conveyed forward at a constant sewing pitch.

[ technical Effect of embodiments of the invention ]

The up-down feeding mechanism 40 of the sewing machine 10 includes: an upper and lower feed shaft 41 to which a reciprocating rotation motion is imparted from the lower shaft 15 by an upper and lower crank mechanism 44; and a height adjusting section 50 for adjusting the height of the feed teeth 4 by adjusting the angle of the up-down feed wrist 42 with respect to the up-down feed shaft 41.

As described above, if the angle of the up-and-down feed arm 42 with respect to the up-and-down feed shaft 41 is changed, the front end portion of the feed table 5 connected via the up-and-down feed connecting link 43 moves up and down, and the height of the feed teeth 4 can be adjusted.

In addition, in the case where the height of the feed teeth 4 is adjusted by changing the angle of the up-and-down feed arm 42 with respect to the up-and-down feed shaft 41 as in the height adjusting section 50, the up-and-down feed lever 46 does not change with respect to the angle of the down shaft 15 and the up-and-down feed cam 45, and therefore, only the height adjustment can be performed without changing the phase of the up-and-down movement of the feed teeth 4 with respect to the shaft angle of the down shaft 15.

Fig. 7 is an oblique view of an up-down feeding mechanism 40X as a comparative example. In the up-down feeding mechanism 40X, one end of the up-down feeding lever 46 is rotatably connected to the lower shaft 15 via the up-down feeding cam 45, and the other end is rotatably connected to the front end of the feeding table 5 about the Y axis.

The other end of the up-down feed lever 46 and the front end of the feed table 5 are connected by an adjustment pin 50X having an eccentric shaft, and the height of the feed teeth 4 can be adjusted by rotating the adjustment pin 50X.

In the case of the up-and-down feeding mechanism 40X described above, the height of the feeding teeth 4 is changed by the rotation operation of the adjusting pin 50X, but the other end portion of the up-and-down feeding lever 46 is also rotated in association with this, and therefore, the phase of the up-and-down movement of the feeding teeth 4 with respect to the shaft angle of the lower shaft 15 inevitably changes.

Fig. 8 shows a movement locus of the feed tooth 4 in the case where the height adjustment of the feed tooth 4 is performed by the height adjustment section 50 of the up-down feed mechanism 40 as an embodiment.

Fig. 9 shows a movement locus of the feed tooth 4 in the case where the height adjustment of the feed tooth 4 is performed by the adjustment pin 50X of the up-down feed mechanism 40X as a comparative example.

In any case, the solid line shows the state before adjustment, the broken line shows the case where the feed tooth 4 is adjusted upward, and the broken line shows the case where the feed tooth 4 is adjusted downward.

By comparing these, in the case of the height adjusting section 50 of the up-and-down feeding mechanism 40, when the feeding teeth 4 are adjusted in any of the upward and downward directions, it is found that the phase variation of the reciprocating up-and-down movement of the feeding teeth 4 with respect to the shaft angle of the lower shaft 15 hardly occurs. That is, the movement locus described by the feed teeth 4 is only horizontally moved upward and downward, and no positional variation in the feed direction of the feed teeth 4 occurs.

In the case of the adjustment pin 50X of the up-and-down feed mechanism 40X, when the feed tooth 4 is adjusted in any of the upward and downward directions, the phase of the reciprocating up-and-down movement of the feed tooth 4 with respect to the shaft angle of the lower shaft 15 fluctuates, and therefore, it is known that the movement locus of the feed tooth 4 moves forward and backward.

The vertical feed mechanism 40 of the sewing machine 10 includes a vertical movement width adjusting portion 49, and the vertical movement width adjusting portion 49 adjusts the vertical movement width of the feed teeth 4 by moving and adjusting the connection position between the other end portion of the vertical feed lever 46 and the input wrist 47 along the input wrist 47.

Fig. 10 shows a movement locus of the feed tooth 4 in the case where the vertical movement amplitude adjustment of the feed tooth 4 is performed by the vertical movement amplitude adjustment section 49 of the vertical feed mechanism 40. The solid line shows the state before adjustment, the broken line shows the case where the up-down movement amplitude of the feed tooth 4 is enlarged, and the broken line shows the case where the up-down movement amplitude is reduced.

As shown in the figure, the step screw 48 of the vertical movement width adjustment section 49 is loosened and moved, whereby the vertical movement width of the feed tooth 4 can be adjusted as shown in fig. 10. Therefore, complicated operations such as replacement with the vertical feed cam 45 having different eccentric amounts are not required, and the vertical movement width of the feed teeth 4 can be adjusted by a simple operation, so that various kinds of objects to be sewn can be easily sewn.

The horizontal feed mechanism 60 of the sewing machine 10 includes: a horizontal feed shaft 61 that performs a reciprocating rotational motion by a horizontal crank mechanism 64; and a phase adjustment unit 69 for adjusting the phase of the axial angle of the reciprocating forward and backward motion of the feed teeth 4 with respect to the lower shaft 15 by adjusting the axial angle of the horizontal feed cam 65 with respect to the horizontal feed shaft 61.

Fig. 11 shows a movement locus of the feed tooth 4 in the case where the phase of the reciprocating forward and backward motion is adjusted by the phase adjustment portion 69, fig. 11 (a) shows a state before adjustment, fig. 11 (B) shows a state in which the phase is advanced by 10 °, fig. 11 (C) shows a state in which the phase is advanced by 20 °, fig. 11 (D) shows a state in which the phase is retarded by 10 °, and fig. 11 (E) shows a state in which the phase is retarded by 20 °.

As described above, the feeding teeth 4 can be fed in various movement tracks by a simple adjustment operation by the up-and-down movement width adjustment unit 49, and appropriate sewing can be performed for various objects to be sewn.

As is apparent from fig. 2 and 3, the sewing machine 10 has the upper and lower feed shafts 41 positioned on the front side with respect to the lower shaft 15, the horizontal feed shaft 61 positioned on the rear side, and the horizontal feed shaft 61, the lower shaft 15, and the upper and lower feed shafts 41 are arranged in this order from the upstream side toward the downstream side in the feed direction of the workpiece in plan view.

Therefore, the locus of the feed tooth 4 is easily a locus (for example, a locus such as fig. 11 (D)) having a high upstream side and a low downstream side in the feed direction, and the feed force of the workpiece can be improved.

Claims

1. A needle feed sewing machine, comprising: