CN111926471B - Needle feeding sewing machine - Google Patents

Abstract

The present invention provides a needle feed sewing machine that suppresses fluctuations in phase and adjusts the height of feed teeth. The needle feed sewing machine (10) has: a sewing machine motor (13); a lower shaft (15), which is rotationally driven by the sewing machine motor; action; and a horizontal feed mechanism (60), which gives the feed tooth a reciprocating action along the feed direction of the object to be sewn. In the needle feed sewing machine (10), the up and down feed mechanism has: up and down feed shaft (41), which performs reciprocating rotation; the upper and lower crank mechanisms (44), which transmit reciprocating rotation from the lower shaft to the upper and lower feed shafts; reciprocating swing together with the up and down feed shaft; and a height adjustment part (50), which adjusts the height of the feed teeth by adjusting the angle of the up and down feed wrist relative to the up and down feed shaft.

Description

Needle Feed Sewing Machine

technical field

The present invention relates to a needle feed sewing machine that feeds a sewing object by feed teeth.

Background technique

In the past, the sewing machine used the sewing machine motor as the driving source, and the up and down feed mechanism gave the feed tooth a reciprocating motion in the up and down direction, and the horizontal feed mechanism gave the feed tooth a reciprocating motion in the horizontal direction (feeding direction) to perform the needle plate. The feeding action of the sewing object.

The up-and-down feeding mechanism has: an up-and-down feeding cam, which is an eccentric cam provided on the lower shaft rotated by the sewing machine motor; It is connected to one end portion of a feed stand that holds the feed teeth (for example, refer to Patent Document 1).

Furthermore, an eccentric shaft is provided at the connecting portion between the crank rod and the feed table, and by rotating the eccentric shaft, the height of the feed teeth is adjusted when moving up and down.

Patent Document 1: Japanese Patent Laid-Open No. 2018-149248

However, the above-mentioned conventional sewing machine has a problem that if the height adjustment of the feed teeth is performed by the eccentric shaft, the phase also fluctuates along with the variation in the height of the feed teeth.

That is, when the eccentric shaft is rotated, the crank rod is oscillated around the up-and-down feed cam together with the change in the height of the feed teeth, and this wobble becomes the phase of the up-and-down movement of the feed teeth relative to the up-and-down movement phase of the sewing needle. reason for the change.

Therefore, when adjusting the height of the feed teeth, it is necessary to simultaneously adjust the phases of the feed teeth, and the height adjustment operation becomes cumbersome.

Contents of the invention

An object of the present invention is to suppress phase variation during height adjustment of feed teeth, and has any of the following features (1) to (4).

(1)

A needle-feed sewing machine having:

sewing machine motor;

a lower shaft, which is rotationally driven by the sewing machine motor;

a vertical feed mechanism that imparts a reciprocating motion in the vertical direction to the feed teeth; and

a horizontal feed mechanism that gives the feed teeth a reciprocating back and forth motion along the feed direction of the object to be sewn,

The needle feed sewing machine is characterized in that,

The horizontal feed mechanism has:

horizontal feed axis;

a horizontal crank mechanism that transmits reciprocating rotational motion from said lower shaft to said 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 and down feeding mechanism has:

The upper and lower feed shafts perform reciprocating rotation;

an up and down crank mechanism for imparting a reciprocating motion from the lower shaft to the up and down feed shaft;

an up and down feed arm, which is fixedly connected to the up and down feed shaft, and whose swing end imparts reciprocating up and down movement to the feed teeth; and

The height adjustment part adjusts the height of the feed teeth by adjusting the angle of the upper and lower feed wrists relative to the upper and lower feed shafts.

(2)

In the needle-feed sewing machine described in the above (1), it is characterized in that,

The horizontal feed shaft, the lower shaft, and the vertical feed shaft are arranged in the order of the horizontal feed shaft, the lower shaft, and the vertical feed shaft in plan view from the upstream side toward the downstream side in the feeding direction of the sewing object.

(3)

In the needle-feed sewing machine described in the above (1) or (2), it is characterized in that,

The vertical crank mechanism includes: a vertical feed cam composed of an eccentric cam connected to the lower shaft; a vertical feed rod whose one end is rotatably connected to the vertical feed cam; and an input arm fixed to the connected to the vertical feed shaft, and the swing end is connected to the other end of the vertical feed rod,

The needle feed sewing machine has a vertical movement range adjustment unit that moves the other end of the vertical feed rod and the swing end of the input arm along the input arm. Adjust, so as to adjust the range of up and down movement of the feed teeth.

(4)

In the needle-feed sewing machine described in any one of the above (1) to (3), it is characterized in that,

The horizontal feed mechanism has a phase adjustment section that adjusts the phase of the reciprocating back and forth movement of the feed teeth in the feed direction with respect to the shaft angle of the lower shaft,

The horizontal crank mechanism has: a horizontal feed cam composed of an eccentric cam connected to the lower shaft; a horizontal feed rod whose one end is rotatably connected to the horizontal feed cam; an input arm connected to the The horizontal feed shaft is connected; and a horizontal feed connecting link connects the other end of the horizontal feed rod and the swing end of the input arm,

The phase adjustment part adjusts the phase of the reciprocating back and forth movement of the feed teeth by adjusting the angle of the horizontal feed cam relative to the lower shaft.

(5)

In the needle-feed sewing machine described in (4) above, it is characterized in that,

With a feed adjustment mechanism, the feed adjustment mechanism can adjust the feed distance,

The feed adjustment mechanism has:

a sliding body that rotatably holds a connection portion between the horizontal feed rod and the horizontal feed connection link;

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

a slider block having said guide; and

Feed adjustment motor, the output shaft of which is connected with the slider body,

The direction of the guide groove is changed by rotating the slider block by driving the feed amount adjustment motor. Change the direction of movement to adjust the feed pitch.

The effect of the invention

As described above, according to the needle-feed sewing machine according to the present invention, it is possible to suppress phase variation during height adjustment of the feed teeth.

Description of drawings

Fig. 1 is a perspective view extracting the structure related to needle movement and feeding of a sewing object of a needle feed sewing machine as an embodiment of the invention.

Fig. 2 is a perspective view of the up and down feeding mechanism.

Fig. 3 is a perspective view of the horizontal feed mechanism.

Fig. 4 is an exploded oblique view of the horizontal feed mechanism and the feed adjustment mechanism.

Fig. 5 is a perspective view showing the connection state of the horizontal feed arm and the feed table by the horizontal feed eccentric pin.

Fig. 6 is a perspective view of the horizontal feed eccentric pin.

Fig. 7 is a perspective view of a vertical feeding mechanism as a comparative example.

FIG. 8 is a graph showing the movement locus of the feed teeth when the height of the feed teeth is adjusted by the height adjustment unit of the vertical feed mechanism according to the embodiment.

FIG. 9 is a graph showing the movement locus of the feed teeth when the height of the feed teeth is adjusted by the adjustment pins of the vertical feed mechanism as a comparative example.

FIG. 10 is a graph showing a movement locus of the feed tooth when the vertical movement width of the feed tooth is adjusted by the vertical movement width adjustment unit of the vertical feed mechanism.

Fig. 11 is a diagram showing the movement locus of the feed tooth when the phase of the reciprocating motion in the front-rear direction is adjusted by the phase adjustment part, and Fig. 11(A) shows the state before adjustment, and Fig. 11(B) ) shows a state where the phase is advanced by 10°, (C) of FIG. 11 shows a state where the phase is advanced by 20°, (D) of FIG. 11 shows a state where the phase is delayed by 10°, ( E) shows a state where the phase is delayed by 20°.

Explanation of labels

4 feed teeth

5 feed table

10 Needle Feed Sewing Machine

11 stitches

12 needle bars

13 Sewing machine motor

14-pin board

15 lower shaft

16 upper shaft sprocket

17 lower shaft sprocket

18 timing belt

20 needle up and down moving mechanism

21 upper shaft

22 needle bar crank

23 stick holding part

24 needle bar crank rod

30-pin feed mechanism

31 needle bar swing table

32 Oscillating axis

33 Input wrist

34 output wrist

35 connecting rod

40 Up and down feed mechanism

41 Up and down feed axis

42 Feed wrist up and down

421 screw

43 Up and down feeding connecting rod

44 Up and down crank mechanism

45 Feed cam up and down

46 Up and down feed rod

47 Input wrist

471 long hole

48 stepped screw

49 Up and down movement range adjustment unit

50 height adjustment part

60 Horizontal feed mechanism

61 Horizontal feed axis

62 horizontal feed wrist

63 Horizontal feed connecting rod

64 horizontal crank mechanism

65 horizontal feed cam

651 screw

66 horizontal feed bar

67 Input wrist

69 Phase adjustment unit

80 Feed adjustment mechanism

81 sliding body

82 Guidance Department

83 slider body

84 Feed adjustment motor

85 Wrist Turn

86 Feed adjustment connecting rod

Detailed ways

[Overall structure of the embodiment]

Hereinafter, an embodiment of the present invention will be described in detail based on FIGS. 1 to 11 . In this embodiment, a two-needle needle-feed sewing machine will be described as an example. Needle-feed sewing machines, for example, are capable of needle-feeding synchronously with the feed teeth for sewn objects such as thick objects that are difficult to accurately feed at a set pitch due to slippage in a normal feed mechanism. A sewing machine in which the needle of the stick swings and feeds at a set pitch while the needle penetrates the object to be sewn.

Here, in the following description, the horizontal direction along the feed direction of the object to be sewn is defined as the X-axis direction (front-rear direction), and the horizontal direction perpendicular to the X-axis direction is defined as the Y-axis direction ( left-right direction), and a direction perpendicular to both the X-axis direction and the Y-axis direction is defined as the Z-axis direction (up-down direction). In addition, the downstream side of 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 facing forward.

FIG. 1 is a perspective view extracting the structure related to needle movement and feeding of a sewing object of a needle feed sewing machine 10 . As shown in Figure 1, the needle feed sewing machine 10 (hereinafter, referred to as the sewing machine 10 for short) has: a sewing machine motor 13, which becomes the driving source of the sewing action; The two needle bars 12 kept on the ground give the movement up and down; the needle feed mechanism 30, which makes the two needle bars 12 swing along the X-axis direction; the lower shaft 15; the up and down feed mechanism 40, which makes the feed teeth 4 move along the Z axis Axial direction moves up and down; Horizontal feed mechanism 60, it makes feed tooth 4 carry out reciprocating movement along X-axis direction; The spacing is adjusted; and the needle plate 14.

In addition, although illustration is omitted, the sewing machine 10 also has structures necessary for sewing such as a sewing machine frame, a kettle mechanism, a thread take-up lever mechanism, and a thread regulator device, but these structures are well-known structures, so description thereof will be omitted.

[Sewing needle up and down movement mechanism]

The needle up and down movement mechanism 20 has: an upper shaft 21, which is given a full circle rotation (continuous rotation to a certain direction) by the sewing machine motor 13; a needle bar crank 22, which is arranged on one end of the upper shaft 21; The holding part 23, which holds the two needle bars 12; and the needle bar crank rod 24, which connects the needle bar crank 22 and the needle bar holding part 23.

Furthermore, when the needle bar crank 22 rotates together with the upper shaft 21 , the needle bar crank rod 24 converts the rotational motion into a vertical reciprocating motion and transmits it to the needle bar holding portion 23 . Accordingly, the needle bar 12 moves up and down according to the number of rotations of the sewing machine motor 13 .

[needle feed mechanism]

The needle feeding mechanism 30 has: a needle bar swing base 31 that supports the two needle bars 12 to move up and down; a swing shaft 32 that supports the needle bar swing base 31 so that it can swing around the Y axis; an input arm 33 that supports The swing shaft 32 is input with reciprocating rotation; the output arm 34 is fixedly connected to the end of the horizontal feed shaft 61 of the horizontal feed mechanism 60 described later; 33 to connect.

The two needle bars 12 need to swing so that the sewing needles 11 move back and forth synchronously with the back and forth movement of the feed teeth 4 .

Therefore, the horizontal feed shaft 61 and the swing shaft 32 are connected via the output arm 34, the connecting link 35, and the input arm 33 so that the feed teeth 4 are given horizontal feed in the forward and backward direction (X-axis direction). The horizontal feed shaft 61 of the mechanism 60 and the swing shaft 32 perform reciprocating rotation synchronously.

Thereby, the needle bar swing table 31 swings synchronously with the feed teeth 4, and the sewing needle 11 positioned at the tip of each needle bar 12 moves in the feed direction together with the feed teeth 4.

In addition, the needle vertical movement mechanism 20 and the needle feed mechanism 30 are disposed in the sewing machine arm portion and the vertical body portion of the 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 along the Y-axis direction.

Further, the lower shaft 15 and the upper shaft 21 rotate at a constant speed in conjunction with the timing belt 18 stretched between the upper shaft sprocket 16 provided on the upper shaft 21 and the lower shaft sprocket 17 provided on the lower shaft 15 .

In addition, the left end portion of the lower shaft 15 is engaged with a kettle mechanism (not shown), and power is input to the kettle mechanism.

[Up and down feed mechanism]

FIG. 2 is a perspective view of the vertical feeding mechanism 40 . The vertical feed mechanism 40 is disposed in a sewing machine bed (not shown).

As shown in Fig. 1 and Fig. 2, the up and down feed mechanism 40 has: the up and down feed shaft 41 along the Y-axis direction, which performs reciprocating rotation; Reciprocating rotation action; Up and down feeding wrist 42, which is fixedly connected to the up and down feeding shaft 41 and reciprocatingly swings together with the up and down feeding shaft 41; The front end portion of the feed table 5 is connected to the swing end portion of the vertical feed arm 42 .

In addition, the vertical crank mechanism 44 has: a vertical feed cam 45 composed of an eccentric cam fixedly connected to the lower shaft 15; a vertical feed rod 46 whose one end is rotatably connected to the vertical feed cam 45; The input arm 47 is fixedly connected to the vertical feed shaft 41 and receives input from the vertical feed rod 46 to reciprocate.

The vertical feed cam 45 is an outer peripheral cam whose outer circumference is a perfect circle, and the lower shaft 15 passes through the eccentric position, and the vertical feed cam 45 is fixed to the lower shaft 15 .

The vertical feed rod 46 holds the outer periphery of the vertical feed cam 45 at one end thereof via a radial bearing not shown, and the vertical feed cam 45 is rotatable relative to the vertical feed rod 46 . Therefore, when the vertical feed cam 45 rotates together with the lower shaft 15 , one end of the vertical feed rod 46 revolves around the lower shaft 15 according to the eccentricity of the vertical feed cam 45 .

On the other hand, the input arm 47 has one end fixedly supported by the right end of the vertical feed shaft 41 along the Y-axis direction, and swings around the vertical feed shaft 41 . Moreover, at the swing end of the input arm 47, an elongated hole 471 is formed along the length direction of the input arm 47 (radius direction centered on the up-and-down feed shaft 41), and the stepped screw passing through the elongated hole 48, the other end of the vertical feed rod 46 is connected so as to be rotatable around the Y axis. The direction in which the input arm 47 protrudes and the direction in which the other end of the vertical feed rod 46 protrudes are preferably substantially perpendicular to each other.

Thus, when one end of the vertical feed rod 46 is rotated by the rotation of the lower shaft 15, a reciprocating swing motion is input to the swing end of the input arm 47 via the other end of the vertical feed rod 46, The input arm 47 and the vertical feed shaft 41 are integrally reciprocated at a cycle equal to the rotation cycle of the lower shaft 15 .

A vertical feed arm 42 is hugged and fixed to the left end of the vertical feed shaft 41 , and the vertical feed arm 42 can swing integrally with the vertical feed shaft 41 . The swing end of the up and down feed arm 42 is connected to one end of the up and down feed link 43 rotatably around the Y axis, and the other end of the up and down feed link 43 is rotatably connected to the feed table 5 around the Y axis. connection at the front end.

In addition, the swing end portion of the vertical feed arm 42 protrudes substantially rearward, and the swing end portion reciprocates in the vertical direction.

Therefore, if the reciprocating motion is input to the up and down feed shaft 41 from the lower shaft 15 via the up and down crank mechanism 44, the swing end of the up and down feed arm 42 reciprocates in the up and down direction, and the up and down feed connection link 43 is used to feed the feed shaft 41. The table 5 and the feed teeth 4 are given reciprocating up and down movement.

In addition, if the stepped screw 48 connecting the aforementioned input arm 47 and the up-and-down feed rod 46 is loosened, it can move along the elongated hole 471, and can move along the longitudinal direction (arrow S direction) of the input arm 47. The connection position of the vertical feed rod 46 is adjusted. Accordingly, it is possible to increase or decrease the reciprocating rotation angle given from the lower shaft 15 to the vertical feed shaft 41 , and also to adjust the vertical movement range of the feed teeth 4 . That is, the input arm 47 and the stepped screw 48 constitute a vertical movement range adjustment unit 49 that adjusts the vertical movement range of the feed teeth.

In addition, the aforementioned vertical feed arm 42 is hugged and fixed with respect to the vertical feed shaft 41 by screws 421 . Therefore, if the screw 421 is loosened, the vertical feed arm 42 can rotate relative to the vertical feed shaft 41 , and the rotation angle of the axis can be adjusted along the arrow H. Thus, if the up and down feed shaft 41 is fixed and the rotation of the up and down feed wrist 42 is adjusted, the feed table 5 and the feed teeth 4 move up and down via the up and down feed connection link 43, and their height adjustment. That is, these holding structures of the vertical feed arms 42 and the screws 421 constitute the height adjustment unit 50 for adjusting the height of the feed teeth 4 .

[Horizontal feed mechanism]

FIG. 3 is a perspective view of the horizontal feed mechanism 60 , and FIG. 4 is an exploded perspective view of the horizontal feed mechanism 60 and the feed amount adjustment mechanism 80 . The horizontal feed mechanism 60 is disposed in a sewing machine bed (not shown).

As shown in Fig. 1, Fig. 3 and Fig. 4, the horizontal feed mechanism 60 has: a horizontal feed shaft 61 along the Y-axis direction, which performs reciprocating rotation; a horizontal crank mechanism 64, which passes from the lower shaft 15 through the The feed amount adjustment mechanism 80 transmits the reciprocating motion to the horizontal feed shaft 61 ; and the horizontal feed arm 62 is fixedly connected to the horizontal feed shaft 61 and reciprocates together with the horizontal feed shaft 61 .

In addition, the horizontal crank mechanism 64 has: a horizontal feed cam 65 composed of an eccentric cam fixedly connected to the lower shaft 15; a horizontal feed rod 66 whose one end is rotatably connected to the horizontal feed cam 65; Wrist 67, which is fixedly connected to the horizontal feed shaft 61 and is input from the horizontal feed rod 66 to swing reciprocally; Connect the ends.

The horizontal feed cam 65 is an outer peripheral cam having a perfect circular portion on the outer circumference, and the lower shaft 15 passes through the eccentric position, and the horizontal feed cam 65 is fixed to the lower shaft 15 .

The horizontal feed rod 66 holds the outer circumference of the perfect circle portion of the horizontal feed cam 65 at one end thereof via a radial bearing not shown, and the horizontal feed cam 65 is rotatable relative to the horizontal feed rod 66 . The other end of the horizontal feed rod 66 faces upward. If the horizontal feed cam 65 rotates together with the lower shaft 15, one end of the horizontal feed rod 66 is centered on the lower shaft 15, corresponding to the eccentricity of the horizontal feed cam 65. The other end of the horizontal feed rod 66 reciprocates up and down.

In addition, the other end portion of the horizontal feed rod 66 is connected to one end portion of the horizontal feed connecting link 63 so as to be rotatable around the Y axis.

On the other hand, the input arm 67 has one end portion fixedly supported by the right end portion of the horizontal feed shaft 61 along the Y-axis direction, and swings around the horizontal feed shaft 61 . Further, the swing end of the input arm 67 protrudes upward, and the swing end is connected to the other end of the horizontal feed connection link 63 so as to be rotatable around the Y-axis.

A horizontal feed arm 62 capable of swinging integrally with the horizontal feed shaft 61 is held and fixed to the left end portion of the horizontal feed shaft 61 . The swing end of the horizontal feed arm 62 is connected to the rear end of the feed table 5 via a horizontal feed eccentric pin 68 so as to be rotatable around the Y axis. As shown in FIGS. 5 and 6 , the eccentric pin 68 has a first shaft portion 681 and a third shaft portion 683 inserted into the horizontal feed arm 62 and a second shaft portion 682 inserted into the feed table 5. The first shaft portion 681 and the third shaft portion 683 are concentrically formed, and only the second shaft portion 682 is eccentric. Therefore, when the horizontal feed eccentric pin 68 is rotated, the end portion of the horizontal feed arm 62 side of the feed table 5 is displaced up and down, and the inclination of the feed teeth 4 can be adjusted.

Moreover, the swing end part of the horizontal feed arm 62 protrudes substantially upward, and the swing end part reciprocates in the front-back direction.

Therefore, if the horizontal feed shaft 61 is input with a reciprocating rotation motion from the lower shaft 15 via the horizontal crank mechanism 64, the swing end of the horizontal feed arm 62 moves back and forth in the front and rear direction, and the feed table 5 and the feed teeth 4 are moved back and forth. Gives reciprocating back and forth movement.

In addition, the aforementioned horizontal feed cam 65 is fixed to the lower shaft 15 by two grub screws 651. If these grub screws 651 are loosened, the horizontal feed cam 65 can rotate relative to the lower shaft 15, and can be rotated in the arrow P direction. Adjust the axis angle. Thereby, the phase of the reciprocating motion given to the horizontal feed shaft 61 from the lower shaft 15 can be adjusted, and the phase of the horizontal motion of the feed teeth 4 can also be adjusted. That is, these horizontal feed cams 65 and grub screws 651 constitute a phase adjustment unit 69 that adjusts the phase of the reciprocating back and forth movement of the feed teeth 4 with respect to the axial angle of the lower shaft 15 .

In addition, the above-mentioned horizontal feed arm 62 is hugged and fixed with respect to the horizontal feed shaft 61 by unshown screws. Therefore, if the screw is loosened, the horizontal feed arm 62 can rotate relative to the horizontal feed shaft 61 , and the rotation angle of the axis along the arrow F can be adjusted. Thus, when 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 move forward and backward, and their front and rear positions can be adjusted. That is, these holding structures and screws of the horizontal feed arm 62 constitute a horizontal position adjustment unit that adjusts the front-rear position of the feed tooth 4 with respect to the needle entry position.

[Feed adjustment mechanism]

The feed amount adjustment mechanism 80 restricts the movement direction of the connecting portion of the horizontal feed rod 66 and the horizontal feed connection link 63 of the above-mentioned horizontal feed mechanism 60, and by changing the angle around the Y axis in the moving direction , so as to adjust the reciprocating rotation angle transmitted to the horizontal feed shaft 61 .

As shown in Fig. 1 and Fig. 4, the feed adjustment mechanism 80 has a pair of sliding bodies 81 (only one shown in the figure), which can rotate around the connecting portion of the horizontal feed rod 66 and the horizontal feed connecting link 63. The Y-axis is rotatably mounted; a pair of guide parts 82 slidably support each slider 81; a slider block 83 holds the pair of guide parts 82 and is supported rotatably around the Y-axis in the sewing machine base part. Feed amount adjustment motor 84, which makes the slider block body 83 rotate to any rotation angle; Rotating wrist 85, which is installed on the output shaft of the feed amount adjustment motor 84 towards the Y-axis direction; and feed amount adjustment link The connecting rod 86 connects the rotating end of the rotating arm 85 and the slider body 83 .

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

The pair of sliders 81 are constrained to be slidably supported along a guide groove formed in the guide portion 82 , and the connecting portion of the horizontal feed rod 66 and the horizontal feed connection link 63 reciprocates along the guide groove. In addition, the guide groove has an arc shape along the locus of rotation of the horizontal feed connection link 63 .

Moreover, if the slider body 83 is rotated via the rotating arm 85 and the feed adjustment connecting link 86 by the drive of the feed adjustment motor 84, the direction of the groove of the guide portion 82 is also rotated around the Y axis, horizontally The moving direction of the connecting portion of the feed rod 66 and the horizontal feed connecting link 63 is also changed.

At this time, if the orientation of the guide groove of the guide portion 82 is closer to the X-axis direction, the range of the reciprocating rotation angle of the horizontal feed shaft 61 becomes larger, and the width of the reciprocating forward and backward movement along the feeding direction of the feed tooth 4 is adjusted. get bigger. More specifically, with respect to the position of the slider block body 83 at which the feed pitch becomes 0, if the slider block body 83 is rotated counterclockwise when viewed from the left, the feed pitch in the positive feed direction becomes Large, if the slider block 83 is made clockwise when viewed from the left, the feeding pitch in the reverse feeding direction becomes larger.

In addition, if the slider block body 83 is rotated so that the orientation of the guide groove of the guide portion 82 is close to the Z-axis direction, the range of the reciprocating rotation angle of the horizontal feed shaft 61 becomes smaller, and the feed along the feed teeth 4 The width of the reciprocating forward and backward movement in the direction also becomes smaller, so the feed pitch is close to 0.

[Sewing action of the sewing machine]

When the sewing machine motor 13 is driven, the needle vertical movement 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 in the vertical feeding mechanism 40 , the vertical feeding shaft 41 is reciprocated by the vertical crank mechanism 44 . As a result, the feed table 5 and the feed teeth 4 reciprocate up and down by feeding the wrist 42 up and down.

In addition, in the horizontal feed mechanism 60 , the horizontal feed shaft 61 is reciprocated by a horizontal crank mechanism 64 . Accordingly, the feed table 5 and the feed teeth 4 reciprocate back and forth by the horizontal feed arm 62 .

By synchronously inputting the reciprocating up and down movement and reciprocating forward and backward movement to the feed table 5, the feed tooth 4 can move in a long circle along the X-Z plane, and the sewing object on the needle plate 14 is moved forward at a constant sewing distance. to deliver.

[Technical Effects of Embodiments of the Invention]

The up and down feed mechanism 40 of the sewing machine 10 has: the up and down feed shaft 41, which is given reciprocating rotation from the lower shaft 15 by the up and down crank mechanism 44; 41 angle adjustment, the height of feed tooth 4 is adjusted.

As mentioned above, if the angle of the up and down feed arm 42 relative to the up and down feed shaft 41 is changed, the front end of the feed table 5 connected via the up and down feed connection link 43 moves up and down, and the feed teeth 4 can be moved up and down. height adjustment.

And, like this height adjustment part 50, when changing the angle of the up and down feed arm 42 relative to the up and down feed shaft 41 to adjust the height of the feed tooth 4, since there is no relative up and down feed rod 46 Since the angle of the lower shaft 15 and the vertical feed cam 45 varies, only the height can be adjusted without changing the phase of the reciprocating vertical movement of the feed teeth 4 with respect to the axial angle of the lower shaft 15 .

FIG. 7 is a perspective view of a vertical feed mechanism 40X as a comparative example. In this vertical feed mechanism 40X, one end of the vertical feed rod 46 is rotatably connected to the lower shaft 15 via the vertical feed cam 45, and the other end is connected to the front end of the feed table 5 so as to be rotatable around the Y axis. .

Further, the other end of the vertical feed rod 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 vertical feed mechanism 40X as described above, the height of the feed teeth 4 is changed by rotating the adjustment pin 50X, but the other end of the vertical feed rod 46 is also rotated accordingly. Therefore, the phase of the reciprocating vertical movement of the feed tooth 4 with respect to the axial angle of the lower shaft 15 inevitably fluctuates.

FIG. 8 shows the movement trajectory of the feed tooth 4 when the height adjustment of the feed tooth 4 is performed by the height adjustment unit 50 of the vertical feed mechanism 40 as an embodiment.

FIG. 9 shows the movement trajectory 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 vertical feed mechanism 40X as a comparative example.

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

By comparing them, in the case of the height adjustment unit 50 of the vertical feed mechanism 40, when the feed teeth 4 are adjusted in any direction up and down, it can be seen that the reciprocating up and down of the feed teeth 4 Variations in the phase of the movement relative to the shaft angle of the lower shaft 15 hardly occur. That is, the movement locus drawn by the feed tooth 4 is only horizontally moved up and down, and the positional fluctuation of the feed tooth 4 in the feeding direction does not occur.

In addition, in the case of the adjustment pin 50X of the vertical feed mechanism 40X, when the feed tooth 4 is adjusted in any direction upward or downward, the reciprocating vertical movement of the feed tooth 4 is relative to the axial angle of the lower shaft 15. The phase changes, so it can be seen that the trajectory of the feed tooth 4 moves forward and backward.

In addition, the vertical feed mechanism 40 of the sewing machine 10 has a vertical movement range adjustment part 49 that moves and adjusts the connection position between the other end of the vertical feed rod 46 and the input arm 47 along the input arm 47. , so as to adjust the up and down movement range of the feed tooth 4.

FIG. 10 shows the movement locus of the feed tooth 4 when the vertical movement range of the feed tooth 4 is adjusted by the vertical movement range adjustment unit 49 of the vertical feed mechanism 40 . The solid line shows the state before adjustment, the dotted line shows the case where the vertical movement width of the feed tooth 4 is enlarged, and the dotted line shows the case where the vertical movement width is reduced.

As shown in the figure, the vertical movement width of the feed tooth 4 can be adjusted as shown in FIG. 10 by loosening and moving the stepped screw 48 of the vertical movement width adjustment part 49 . Therefore, there is no need for such cumbersome work as replacing the vertical feed cam 45 with a different eccentricity, and the vertical movement range of the feed tooth 4 can be adjusted by simple work, and it is possible to easily adapt to a variety of sewing objects. things to sew.

In addition, the horizontal feed mechanism 60 of the sewing machine 10 has: the horizontal feed shaft 61, which is reciprocated by the horizontal crank mechanism 64; Shaft angle adjustment is to adjust the phase of the reciprocating forward and backward movement of the feed tooth 4 relative to the shaft angle of the lower shaft 15 .

Fig. 11 shows the movement trajectory of the feed tooth 4 when the phase of the reciprocating front and rear motion is adjusted by the phase adjustment part 69. (A) of Fig. 11 shows the state before adjustment, and (B) of Fig. 11 shows 11 (C) shows a state in which the phase is advanced by 20°, and (D) in FIG. 11 shows a state in which the phase is delayed by 10°. (E) of FIG. 11 A state where the phase is delayed by 20° is shown.

As described above, the feed teeth 4 can be fed in various moving trajectories by the simple adjustment operation by the vertical movement width adjusting portion 49, and appropriate sewing can be performed for various kinds of sewing objects.

In addition, in the sewing machine 10, as can be seen with reference to FIGS. 2 and 3 , with respect to the lower shaft 15, the vertical feed shaft 41 is located on the front side, and the horizontal feed shaft 61 is located on the rear side. The upstream side of the feeding direction faces the downstream side, and the horizontal feed shaft 61 , the lower shaft 15 , and the vertical feed shaft 41 are arranged in this order.

Therefore, the trajectory of the feed tooth 4 is easy to obtain a trajectory that is high on the upstream side and low on the downstream side in the feeding direction (for example, a trajectory such as (D) in FIG. 11 ), and the feeding force of the sewing object can be improved.

Claims (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

a height adjusting part for adjusting the height of the feeding teeth through the angle adjustment of the upper and lower feeding wrists relative to the upper and lower feeding shafts,

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.

2. The needle feeding sewing machine of claim 1, wherein the needle feeding sewing machine is a needle feeding sewing machine,

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 of claim 1 or 2, wherein,

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.

4. The needle feeding sewing machine of claim 3, wherein the needle feeding mechanism comprises a needle feeding mechanism,

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.