Differential feed sewing machine

Abstract

The invention provides a differential feed sewing machine which appropriately sets the feed amount of auxiliary feed teeth. The feeding mechanism (30) is provided with main feeding teeth (31) and auxiliary feeding teeth (32) which feed on the downstream side and the upstream side in the feeding direction of a sewn object. A first feed adjustment mechanism (60) for adjusting the sewing pitch of the main feed teeth to any size; a second feed adjustment mechanism (80) for adjusting the sewing pitch of the sub-feed teeth to an arbitrary size, the second feed adjustment mechanism adjusting the sewing pitch of the sub-feed teeth by means of an actuator (82), the second feed adjustment mechanism comprising: a setting input unit (95) for setting the sewing pitch of the input sub-feed teeth; and a control device (90) for controlling the actuator so as to become the sewing pitch of the auxiliary feed teeth input from the setting input part.

Description

Technical Field

[0001] The invention relates to a differential feeding sewing machine. Background Art

[0002] A conventional differential feed sewing machine includes feed teeth composed of main feed teeth on the downstream side of the feed direction and auxiliary feed teeth on the upstream side, and can perform a feed operation in a manner that a difference is generated in the sewing pitch between the main feed teeth and the auxiliary feed teeth.

[0003] Then, by operating a manual knob or the like, the ratio of the sewing pitch between the main feed teeth and the sub-feed teeth is set, thereby providing a difference in the sewing pitch (for example, refer to Patent Document 1).

[0004] Prior art literature

[0005] Patent Literature

[0006] Patent Document 1: Japanese Patent Application Publication No. 2007-185296 Summary of the invention

[0007] 1. Technical issues to be resolved

[0008] However, the conventional differential feed sewing machine needs to manually adjust the ratio of the sewing pitch of the main feed teeth to that of the auxiliary feed teeth after setting the sewing pitch of the main feed teeth, which results in a problem of low reproducibility.

[0009] Furthermore, since the setting is performed by the ratio of the sewing pitches of the main feed teeth and the sub-feed teeth, when the sewing pitch of the main feed teeth and the sewing pitch of the sub-feed teeth are to be set separately, the ratio must be calculated, and the setting operation may become complicated.

[0010] Moreover, sometimes it is desired to change only the sewing pitch of the main feed teeth while fixing the sewing pitch of the auxiliary feed teeth. However, in this case, both the sewing pitch of the main feed teeth and the ratio of the sewing pitch must be reset, and the setting operation is complicated.

[0011] An object of the present invention is to appropriately set the feed amount of auxiliary feed teeth in a differential feed sewing machine.

[0012] (II) Technical solution

[0013] The present invention is characterized in that, in a differential feed sewing machine, there is provided:

[0014] A feeding mechanism having main feeding teeth and auxiliary feeding teeth for feeding on the downstream side and the upstream side of the feeding direction of the sewn article;

[0015] The first feed adjustment mechanism adjusts the sewing spacing of the main feed teeth to any size:

[0016] The second feed adjustment mechanism adjusts the sewing spacing of the auxiliary feed teeth to any size.

[0017] The second feed adjustment mechanism adjusts the sewing spacing of the auxiliary feed teeth through an actuator.

[0018] It is provided with: a setting input part, which sets and inputs the sewing pitch of the auxiliary feed teeth;

[0019] A control device controls the actuator so as to achieve the sewing pitch of the auxiliary feed teeth input from the setting input unit.

[0020] (III) Beneficial effects

[0021] According to the present invention, the feed amount of the auxiliary feed teeth can be appropriately set by the above-mentioned structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a perspective view showing the whole of a differential feed sewing machine according to an embodiment of the invention.

[0023] Figure 2 It is from Figure 1 Three-dimensional images of the interior of a sewing machine viewed from different directions.

[0024] Figure 3 It is from Figure 1 and Figure 2 Three-dimensional images of the interior of a sewing machine viewed from different directions.

[0025] Figure 4 This is a right side view of the inside of the sewing machine.

[0026] Figure 5 It is a perspective view showing the structure of the inner side around the needle plate.

[0027] Figure 6 It is a perspective view showing the main parts of the first feed adjustment mechanism.

[0028] Figure 7 This is a block diagram showing a control system of a differential feed sewing machine.

[0029] Figure 8 This is a display example of a setting screen for setting the sewing pitch of the auxiliary feed teeth in the setting input section.

[0030] Fig. 9 This is a flowchart showing the control performed by the control device when setting the sewing pitch of the main feed teeth and the sewing pitch of the auxiliary feed teeth.

[0031] Fig.10 This is a display example of a setting screen for setting the sewing pitch of the main feed teeth and the sewing pitch of the sub-feed teeth in the setting input unit.

[0032] Description of reference numerals:

[0033] 10: sewing machine frame; 14: needle plate; 16: sewing machine motor; 20: needle up and down moving mechanism; 21: sewing needle; 22: needle bar; 23: upper shaft; 30: feeding mechanism; 31: main feeding tooth; 32: auxiliary feeding tooth; 33: first feeding platform; 34: second feeding platform; 40: up and down feeding mechanism; 41: up and down feeding shaft; 44: first output arm; 45: second output arm; 50: first horizontal feeding mechanism; 51: first horizontal feeding shaft; 54: relay arm; 56: output arm; 60: first feed adjustment mechanism; 63: feed adjustment body; 64: feed adjustment dial; 67: potentiometer (detection unit); 70: second horizontal feed mechanism; 71: second horizontal feed shaft; 72: input arm; 80: second feed adjustment mechanism; 81: movable connecting part; 82: auxiliary feed tooth adjustment motor; 90: control device; 91: CPU; 95: setting input part; 100: differential feed sewing machine; G1, G2: setting screen. DETAILED DESCRIPTION

[0034] [Schematic Structure of Embodiment]

[0035] Next, a differential feed sewing machine 100 which is an embodiment of the present invention will be described in detail.

[0036] Figure 1 1 is a perspective view showing the entirety of the differential feed sewing machine 100. Figure 2 It is from Figure 1 Observe the three-dimensional image of the inside of the sewing machine from different directions. Figure 3 It is from Figure 1 and Figure 2 Observe the three-dimensional image of the inside of the sewing machine from different directions. Figure 4 This is the right side view of the inside of the sewing machine. Figure 5 It is a perspective view showing the structure of the inner side around the needle plate.

[0037] like Figure 1~Figure 4 As shown, the differential feed sewing machine 100 comprises: a needle up-and-down moving mechanism 20, which moves the sewing needle 21 up and down by rotating the upper shaft 23; a kettle (not shown), which winds the upper thread around the lower thread; a feeding mechanism 30, which performs differential feeding of the sewn material on the needle plate 14 synchronously with the up-and-down movement of the sewing needle 21 through the main feeding teeth 31 and the auxiliary feeding teeth 32; a sewing machine frame 10, which supports the above-mentioned structures; and a control device 90 (refer to Figure 7 ), which controls the above structures.

[0038] In addition, the above-mentioned differential feed sewing machine 100 has various structures such as a thread take-up lever, a thread adjuster, and a presser foot that are included in a general sewing machine. Since these are well-known, their description is omitted.

[0039] The above-mentioned sewing machine frame 10 comprises: a base portion 11, which is located at the lower part of the differential feed sewing machine 100; an upright body portion 12, which is erected upward at one end portion in the length direction of the base portion 11; and an arm portion 13 (not shown) extending from the upper end portion of the upright body portion 12 in the same direction as the base portion 11.

[0040] In the following description, the downstream side of the feed direction of the sewing object is referred to as "front", the upstream side of the feed direction is referred to as "rear", the left hand side is referred to as "left", the right hand side is referred to as "right", the upper side in the vertical direction is referred to as "up", and the lower side in the vertical direction is referred to as "down". In addition, the directions of the various parts of the differential feed sewing machine 100 are based on the premise that the differential feed sewing machine 100 is set on a horizontal plane, and the front-back direction and the left-right direction are horizontal.

[0041] [Needle up and down movement mechanism]

[0042] like Figure 1 As shown, the needle up and down moving mechanism 20 comprises: an upper shaft 23, which is arranged on the inner side of the arm 13, rotated by the sewing machine motor 16 as a driving source, and arranged along the left and right directions, a needle bar 22, which holds the sewing needle 21 at the lower end; and a crank mechanism 24, which converts the rotational force of the upper shaft 23 into a reciprocating driving force for up and down movement and transmits it to the needle bar.

[0043] The upper shaft 23 is connected to the needle bar 22 at the left end via the crank mechanism 24 , and is connected to the output shaft of the sewing machine motor 16 at the right end.

[0044] The crank mechanism 24 is a well-known structure, and includes a rotary weight and a crank rod that are rotated by the upper shaft 23 , and converts the rotation of the upper shaft 23 into an up-and-down reciprocating motion and transmits it to the needle bar 22 .

[0045] The rotation of the upper shaft 23 is transmitted to a pot shaft (not shown) in the base portion 11 by a transmission mechanism (not shown) such as a gear structure using bevel gears or a belt mechanism, thereby driving the pot to rotate.

[0046] [Feeding mechanism]

[0047] like Figure 1~Figure 5As shown, the feed mechanism 30 comprises: a main feed tooth 31 and an auxiliary feed tooth 32, which appear and disappear from the opening of the needle plate 14 to transport the sewn material in a specified direction; a first feed table 33, which holds the main feed tooth 31; a second feed table 34, which holds the auxiliary feed tooth 32; an up and down feed mechanism 40, which obtains power from the sewing machine motor 16 and transmits reciprocating motion in the up and down directions to the first and second feed tables 33, 34; a first horizontal feed mechanism 50, which imparts reciprocating motion in the front-to-back direction to the first feed table 33; and a second horizontal feed mechanism 70, which imparts reciprocating motion in the front-to-back direction to the second feed table 34.

[0048] [Feed teeth and feed table]

[0049] like Figure 5 As shown, the main feed teeth 31 and the auxiliary feed teeth 32 are respectively arranged on the front and rear sides of the needle drop position on the lower side of the needle plate 14. In the differential feed sewing machine 100, for the sewing pitch as the feed amount of the sewn material per stitch, a difference is set on the main feed teeth 31 and the auxiliary feed teeth 32 to achieve front and rear differential feeding.

[0050] For example, in normal sewing, depending on the material of the sewn object, the feed amount of the upper sewn object may be smaller than that of the lower sewn object, resulting in a deviation at the end of the sewing. In addition, the opposite may also occur. In such a case, by differential feeding, a difference can be set in the sewing pitch between the upper sewn object and the lower sewn object, so that appropriate sewing can be performed.

[0051] In addition, by making the sewing pitch of the auxiliary feed teeth 32 on the rear side larger than that of the main feed teeth 31 on the front side, pleat sewing that gives bulge to the upper side of the sewn material can be performed.

[0052] In this way, by providing a difference in sewing pitch between the main feed teeth 31 and the auxiliary feed teeth 32, various sewing operations can be performed.

[0053] The main feed teeth 31 are supported from below by the first feed base 33, and the auxiliary feed teeth 32 are supported from below by the second feed base 34. In the base 11, the first feed base 33 is arranged adjacent to the second feed base 34 on the left side.

[0054] The first feed table 33 and the second feed table 34 both extend in the front-rear direction, and reciprocate in the front-rear direction from their front ends, and reciprocate in the up-down direction at the same cycle from their rear ends.

[0055] The reciprocating motion along the front-back direction and the reciprocating motion along the up-down direction are combined to form an oblong rotating motion along the front-back direction, which transmits the motion to the main feed teeth 31 and the auxiliary feed teeth 32, thereby enabling the feeding of the sewn material.

[0056] In the differential feed sewing machine 100, the stroke of the reciprocating motion in the front-rear direction is adjusted by the main feed teeth 31 and the auxiliary feed teeth 32, thereby realizing differential feeding.

[0057] Furthermore, the first feed table 33 and the second feed table 34 may be fed with reciprocating motion in the front-rear direction from the rear end portions and may be fed with reciprocating motion in the up-down direction from the front end portions.

[0058] [Up and down feeding mechanism]

[0059] like Figure 2 , Figure 3 and Figure 5 As shown, the up and down feed mechanism 40 comprises: an up and down feed shaft 41, which is arranged along the left and right directions in the base portion 11; an input arm 42, which is arranged near the right end portion of the up and down feed shaft 41; a connecting rod 43, which connects the upper shaft 23 and the input arm 42; and a first and a second output arm 44, 45, which are arranged in a left and right arrangement near the left end portion of the up and down feed shaft 41.

[0060] The vertical feed shaft 41 is rotatably supported in the base portion 11 .

[0061] The base end of the input arm 42 is held and fixed to the vertical feed shaft 41 , and the rotation end extends forward from the vertical feed shaft 41 .

[0062] The connecting rod 43 extends in the vertical direction, and the upper end is rotatably connected to an eccentric shaft portion eccentric from the rotation center of the upper shaft 23. The lower end of the connecting rod 43 is rotatably connected to the rotation end of the input arm 42 around an axis along the left-right direction.

[0063] The upper end of the connecting rod 43 revolves via the eccentric shaft portion as the upper shaft 23 rotates, and the lower end inputs a vertical movement of twice the eccentricity of the eccentric shaft portion relative to the upper shaft 23 to the rotating end of the input arm 42 .

[0064] The rotating end portion moves up and down via the connecting rod 43 , whereby the input arm 42 can input a reciprocating rotation motion to the vertical feed shaft 41 .

[0065] The first and second output arms 44 and 45 are both fixed to the left end of the vertical feed shaft 41, and the rotating ends thereof extend forward.

[0066] Furthermore, the first and second output arms 44 and 45 are both formed with slits 441 and 451 along the longitudinal direction on the rotating end side. These slits 441 and 451 are both open toward the front end of the rotating end.

[0067] The first output arm 44 holds the roller 46 rotatably supported around an axis along the left-right direction at the rear end of the first feed table 33 inside the slit 441 in a manner constrained in the up-down direction.

[0068] The second output arm 45 holds the roller 47 rotatably supported around an axis along the left-right direction at the rear end of the second feed table 34 inside the slit 451 in a manner constrained in the up-down direction.

[0069] With these structures, when the first and second output arms 44 and 45 reciprocate vertically together with the vertical feed shaft 41 , the rear ends of the first and second feed stages 33 and 34 can be vertically moved via the rollers 46 and 47 in the slits 441 and 451 .

[0070] [First horizontal feeding mechanism]

[0071] like Figure 2 , Figure 3 and Figure 5 As shown, the first horizontal feed mechanism 50 comprises: a first horizontal feed shaft 51, which is arranged in the left-right direction inside the base portion 11; an input arm 52, which is arranged at the right end portion of the first horizontal feed shaft 51; a connecting rod 53, whose upper end portion is connected to the upper shaft 23; a first feed adjustment mechanism 60, which adjusts the stroke of the reciprocating motion extracted from the lower end portion of the connecting rod 53; a relay arm 54, which inputs the reciprocating motion from the first feed adjustment mechanism 60; a connecting rod 55, which connects the relay arm 54 and the input arm 52; and an output arm 56, which is arranged at the left end portion of the first horizontal feed shaft 51.

[0072] The first horizontal feed shaft 51 is rotatably supported in the base portion 11. The first horizontal feed shaft 51 is a hollow cylindrical body over its entire length, and a second horizontal feed shaft 71 of a second horizontal feed mechanism 70 described later is concentrically inserted into the inside thereof. The second horizontal feed shaft 71 can rotate independently of the first horizontal feed shaft 51.

[0073] The base end of the input arm 52 is held and fixed to the right end of the first horizontal feed shaft 51. The rotation end of the input arm 52 extends downward from the first horizontal feed shaft 51.

[0074] The connecting rod 53 extends in the vertical direction, and the upper end portion is rotatably connected to an eccentric shaft portion eccentric from the rotation center of the upper shaft 23. In addition, the eccentric shaft portion connected to the connecting rod 53 is different from the eccentric shaft portion of the connecting rod 43 of the above-mentioned upper and lower feeding mechanism 40.

[0075] The lower end portion of the connecting rod 53 is connected to one end portion of a transmission link 61 of the first feed adjustment mechanism 60 so as to be rotatable around an axis extending in the left-right direction.

[0076] The other end of the transmission link 61 is connected to a rotation end of the relay arm 54 so as to be rotatable around an axis along the left-right direction.

[0077] The relay arm 54 is rotatably supported on the vertical feed shaft 41. The vertical feed shaft 41 performs a reciprocating rotation motion transmitted from the upper shaft 23, but the relay arm 54 performs a reciprocating rotation motion independently of the reciprocating rotation motion of the vertical feed shaft 41 by the reciprocating motion input from the transmission link 61. That is, the relay arm 54 is not limited to the vertical feed shaft 41, and may be supported on any other shaft along the left-right direction.

[0078] The rotation end of the relay arm 54 extends downward from the vertical feed shaft 41. At the rotation end of the relay arm 54, the other end of the transmission link 61 and one end of the connection link 55 are connected to each other so as to be rotatable around the same axis along the left-right direction.

[0079] In addition, one end portion of a connecting link 75 of a second horizontal feed mechanism 70 described later is also connected on the same axis.

[0080] Therefore, when a reciprocating motion is input from the transmission link 61 to the relay arm 54 , a reciprocating motion is also input to one end of the connecting links 55 , 75 at the same time.

[0081] The connecting link 55 extends along the front-back direction at the inner bottom of the upright body 12. The other end of the connecting link 55 is connected to the rotating end of the input arm 52 facing downward so as to be rotatable around an axis along the left-right direction. Therefore, if the relay arm 54 reciprocates, the input arm 52 can be reciprocated through the connecting link 55, and the reciprocating rotation motion can also be transmitted to the first horizontal feed shaft 51.

[0082] In addition, a rotation support shaft (not shown) capable of position adjustment by extending a hole 521 is provided between the other end of the connecting link 55 and the rotation end of the input arm 52 . The long hole 521 is provided along the extending direction of the input arm 52 .

[0083] The rotation support shaft can be fastened and fixed at any position along the long hole 521 by a fastening member 522 such as a bolt.

[0084] Moreover, if the rotating support shaft is arranged at a position away from the rotation center of the input arm 52, the width of the reciprocating rotation angle of the first horizontal feed shaft 51 performed by the input from the connecting rod 55 can be reduced. If the rotating support shaft is arranged at a position close to the rotation center of the input arm 52, the width of the reciprocating rotation angle of the first horizontal feed shaft 51 performed by the input from the connecting rod 55 can be increased.

[0085] The output arm 56 is fixed to the front end of the first horizontal feed shaft 51 by holding. The rotating end of the output arm 56 extends upward from the first horizontal feed shaft 51, and the rotating end of the output arm 56 reciprocates in the front-rear direction through the reciprocating rotation of the first horizontal feed shaft 51.

[0086] The rotating end of the output arm 56 is connected to the front end of the first feed table 33 so as to be rotatable around an axis along the left-right direction, and can input a reciprocating motion along the front-back direction relative to the front end of the first feed table 33 .

[0087] [First feed adjustment mechanism]

[0088] Figure 6 It is a perspective view showing the main part of the first feed adjustment mechanism 60 .

[0089] like Figure 2 , Figure 4 and Figure 6 As shown, the first feed adjustment mechanism 60 comprises: a transmission link 61, which connects the lower end of the aforementioned connecting rod 53 and the rotating end of the relay arm 54; a pair of limiting links 62, which limit the reciprocating movement direction of the connection part of the connecting rod 53 and the transmission link 61 to an arbitrary direction; a feed adjustment body 63, which supports the pair of limiting links 62 rotatably around an axis along the left and right directions; a feed adjustment dial 64 as a manual input part, which sets the sewing spacing of the input main feed teeth 31; a cam component 65, which swings according to the operation of the feed adjustment dial 64; a linkage rod 66, which is linked to the swing of the cam component 65 to swing the feed adjustment body 63; and a potentiometer 67 as a detection part, which is used to detect the size of the sewing spacing set by the feed adjustment dial 64.

[0090] Since the upper end portion of the connecting rod 53 is connected to the eccentric shaft portion of the upper shaft 23, a reciprocating motion in the up-down direction can be extracted from the lower end portion.

[0091] One end of a transmission link 61 is rotatably connected to the lower end of the connecting rod 53 about an axis along the left-right direction, and the other end of the transmission link 61 is rotatably connected to the lower end of the relay arm 54 about an axis along the left-right direction.

[0092] At this time, when the lower end of the connecting rod 53 reciprocates only in the up-and-down direction and does not reciprocate in the front-and-rear direction, the reciprocating motion is hardly transmitted to the relay arm 54 .

[0093] Therefore, one end of the pair of limiting links 62 can also be connected to the lower end of the connecting rod 53 so as to be rotatable around an axis along the left-right direction. Since the other ends of the pair of limiting links 62 are connected to the lower end of the connecting rod 53 so as to be rotatable around an axis along the left-right direction through the feed adjustment body 63, the reciprocating direction of the lower end of the connecting rod 53 can be limited to a direction along an arc having a radius equal to the distance between the axes of the two ends of the limiting links 62.

[0094] The feed adjustment body 63 has a shaft 631 extending in the left-right direction and is supported in the base 11 so as to be swingable about the shaft 631. By swinging the feed adjustment body 63 and changing its swing angle, the reciprocating direction of the lower end of the connecting rod 53 can also be changed.

[0095] For example, if the swing angle of the feed regulating body 63 is adjusted so that the limiting link 62 is in a state substantially along the front-rear direction (horizontal direction), the lower end of the connecting rod 53 performs reciprocating motion only in the up-and-down direction and hardly transmits the reciprocating motion to the relay arm 54, so the sewing pitch of the main feed teeth 31 is 0. The swing angle of the feed regulating body 63 in this case is referred to as a neutral angle.

[0096] Furthermore, if the feed regulating body 63 is swung from the neutral angle to one direction, a reciprocating motion can be imparted to the main feed teeth 31 in the direction of conveying the sewn material forward (forward feed) via the relay arm 54, the connecting link 55, etc. In addition, the larger the swing angle from the neutral angle to one direction, the larger the width (sewing pitch) of the reciprocating motion of the forward feed can be.

[0097] In addition, if the feed regulating body 63 is swung from the neutral angle to the other direction, a reciprocating motion can be imparted to the main feed teeth 31 in the direction of conveying the sewn material backward (reverse feeding) via the relay arm 54, the connecting link 55, etc. In addition, the larger the swing angle from the neutral angle to the other direction, the larger the width of the reciprocating motion of the reverse feeding (sewing pitch) can be.

[0098] The feed adjustment dial 64 is disposed on the rear side of the upright body 12. The feed adjustment dial 64 is supported by the upright body 12 via a shaft portion 641 formed with an external thread, and moves forward and backward in the front-rear direction by rotating the shaft portion 641.

[0099] A cam member 65 is disposed on the front side of the shaft portion 641 of the feed adjustment dial 64. The cam member 65 is supported in the upright body portion 12 so as to be swingable around an axis extending in the left-right direction.

[0100] The cam member 65 has a cam surface 651 formed at the rear end thereof, which contacts the shaft portion 641 of the feed adjustment dial 64. The upper end of the linkage rod 66 is connected to the front end thereof so as to be rotatable around an axis along the left-right direction. The lower end of the linkage rod 66 is connected to the feed adjustment body 63 so as to be rotatable around an axis along the left-right direction.

[0101] The cam surface 651 of the cam member 65 can swing the cam member 65 about an axis along the left-right direction according to the front-rear movement of the shaft portion 641 of the feed adjustment dial 64 , and can also swing the feed adjustment body 63 via the interlocking rod 66 .

[0102] Therefore, by rotating the feed adjustment dial 64, the feed adjustment body 63 can be freely swung, and the sewing pitch of the forward feed and the reverse feed of the main feed teeth 31 can be set to an arbitrary size.

[0103] The cam member 65 is provided with a detected arm 652 that rotates around an axis along the left-right direction together with the cam member 65. The rotating end of the detected arm 652 extends downward and is connected to the upper end of a driven link 68 that is rotatable around an axis along the left-right direction.

[0104] Furthermore, a potentiometer 67 is disposed on the front side of the driven link 68. The potentiometer 67 has a rod-shaped detection body protruding rearward, and is disposed so that the front end of the detection body abuts against the driven link 68.

[0105] There is a certain correlation between the sewing pitch of the main feed teeth 31 set by the rotation operation of the feed adjustment dial 64 and the displacement (detection amount) of the detection body of the potentiometer 67 through the driven link 68 by the rotation operation of the feed adjustment dial 64. Therefore, by tabulating this correlation and comparing it with the detection amount of the potentiometer 67, the sewing pitch of the main feed teeth 31 currently set by the feed adjustment dial 64 can be detected.

[0106] [Second horizontal feeding mechanism]

[0107] The second horizontal feed mechanism 70 imparts a reciprocating motion in the front-rear direction to the second feed stage 34 from the relay arm 54 of the first horizontal feed mechanism 50 .

[0108] like Figure 2 , Figure 3 and Figure 5As shown, the second horizontal feed mechanism 70 comprises: a second horizontal feed shaft 71, which is concentrically arranged on the inner side of the first horizontal feed shaft 51; an input arm 72, which is arranged at the right end portion of the second horizontal feed shaft 71; a connecting rod 75, which connects the relay arm 54 and the input arm 72; a second feed adjustment mechanism 80, which adjusts the stroke of the reciprocating motion input from the connecting rod 75 to the input arm 72; and an output arm 76, which is arranged at the left end portion of the second horizontal feed shaft 71.

[0109] The second horizontal feed shaft 71 extends in the left-right direction, and its two ends protrude outward from the two ends of the first horizontal feed mechanism 50. An input arm 72 extending downward is fixedly installed at the right end of the second horizontal feed shaft 71, and an output arm 76 extending upward is fixedly installed at the left end of the second horizontal feed shaft 71.

[0110] Furthermore, the upper end portion of the output arm 76 is connected to the front end portion of the second feed table 34 so as to be rotatable around an axis extending in the left-right direction.

[0111] Therefore, when reciprocating rotation is input to the input arm 72 , the reciprocating rotation is transmitted to the output arm 76 via the second horizontal feed shaft 71 , and the output arm 76 can impart reciprocating motion along the front-rear direction to the second feed stage 34 and the auxiliary feed teeth 32 .

[0112] The input arm 72 is prism-shaped, and a rectangular frame-shaped movable connection part 81 of a second feed adjustment mechanism 80 described later is installed to be inserted through the input arm 72. The other end of the connection link 75 is connected to the movable connection part 81 so as to be rotatable around an axis along the left-right direction.

[0113] That is, the connecting link 75 is connected to the input arm 72 via the movable connecting portion 81. Since the movable connecting portion 81 is movable along the input arm 72, when the connecting link 75 transmits a reciprocating motion from the relay arm 54 to the input arm 72, the reciprocating rotation stroke of the input arm 72 can be changed according to the position of the movable connecting portion 81.

[0114] [Second feed adjustment mechanism]

[0115] like Figure 2 and Figure 4As shown, the second feed adjustment mechanism 80 comprises: a movable connecting portion 81, which is connected to the connecting link 75 and can be supported slidably along the extension direction of the input arm 72; a sub-feed tooth adjustment motor 82 as a driving source, which is used to set the sewing spacing of the input sub-feed tooth 32; an output arm 83, which is arranged on the output shaft of the sub-feed tooth adjustment motor 82; a support shaft 84, which is rotatably supported on the upright body portion 12; a driven arm 85, which is fixedly mounted on the right end portion of the support shaft 84; a connecting link 86, which connects the output arm 83 and the driven arm 85; a traction arm 87, which is fixedly mounted on the left end portion of the support shaft 84; and a traction link 88, which connects the rotating end of the traction arm 87 and the movable connecting portion 81.

[0116] As described above, the movable connection portion 81 is movable along the input arm 72. Therefore, the rotation radius around the second horizontal feed shaft 71 can be expanded or reduced with respect to the connection position of the connection link 75 with respect to the input arm 72.

[0117] The auxiliary feed teeth adjustment motor 82 is an actuator for arbitrarily moving and positioning the movable connection part 81 along the input arm 72. The auxiliary feed teeth adjustment motor 82 is arranged with the output shaft facing rightward at the upper front of the upright body part 12. The auxiliary feed teeth adjustment motor 82 is a motor such as a stepping motor whose movement amount can be arbitrarily controlled.

[0118] The output arm 83 is fixedly mounted on the output shaft of the auxiliary feed gear adjustment motor 82 by holding it in a state where the rotation end portion faces downward.

[0119] One end of a connecting link 86 is connected to a rotation end (lower end) of the output arm 83 so as to be rotatable around an axis along the left-right direction.

[0120] The driven arm 85 is fixedly mounted on the support shaft 84 along the left-right direction by holding the rotating end portion thereof downward. The other end portion of the connecting link 86 is connected to the rotating end portion of the driven arm 85 so as to be rotatable around an axis along the left-right direction.

[0121] Therefore, by driving the auxiliary feed gear adjustment motor 82 , a rotational motion is input from the output arm 83 to the driven arm 85 .

[0122] The traction arm 87 is fixedly mounted on the left end of the support shaft 84 in a state where the rotation end faces forward. Therefore, if the rotation operation is input to the driven arm 85, the traction arm 87 can move the rotation end up and down through the support shaft 84.

[0123] The traction link 88 has an upper end connected to the rotation end of the traction arm 87 so as to be rotatable around an axis along the left-right direction, and a lower end connected to the right side surface of the movable connection portion 81 so as to be rotatable around an axis along the left-right direction.

[0124] Therefore, the movable connection portion 81 can be moved up and down along the input arm 72 in accordance with the up and down movement of the rotation end portion of the traction arm 87 .

[0125] If the movable connecting part 81 is raised or lowered by driving the auxiliary feed tooth adjustment motor 82, the reciprocating rotation stroke input from the relay arm 54 to the input arm 72 through the connecting rod 75 changes, and the rotation stroke of the output arm 76 also changes, thereby being able to change the sewing spacing of the auxiliary feed tooth 32.

[0126] In this structure, the shaft angle of the auxiliary feed teeth adjustment motor 82 is correlated with the transmission ratio of the reciprocating motion amount given to the auxiliary feed teeth 32 from the relay arm 54. In addition, the reciprocating motion amount of the relay arm 54 and the sewing pitch of the main feed teeth 31 are also correlated.

[0127] Therefore, the shaft angle of the auxiliary feed tooth adjustment motor 82 and the ratio of the sewing pitch of the auxiliary feed teeth 32 to the sewing pitch of the main feed teeth 31 also have a correlation, and this correlation can be calculated based on actual measurement or design information.

[0128] Therefore, by tabulating the correlation and controlling the shaft angle of the auxiliary feed teeth adjustment motor 82 , the ratio of the sewing pitch of the auxiliary feed teeth 32 to the sewing pitch of the main feed teeth 31 can be arbitrarily set.

[0129] [Control system for differential feed sewing machines]

[0130] The control system of the differential feed sewing machine 100 is shown in FIG. Figure 7 As shown in the block diagram Figure 7 As shown, the control device 90 of the differential feed sewing machine 100 includes: a ROM (Read Only Memory) 92, which stores a program for controlling the motion of each structure; a RAM (Random Access Memory) 93, which serves as a working area for calculation processing; an erasable non-volatile data memory 94 as a storage unit, which stores various setting data, etc.; and a CPU 91 (Central Processing Unit) which executes the program in the ROM 92.

[0131] Furthermore, the control device 90 is connected to the sewing machine motor 16 and the auxiliary feed gear adjustment motor 82 via the respective motor drive circuits 16a and 82a.

[0132] In addition, the sewing machine motor 16 is provided with an encoder 161 for detecting the rotation speed thereof, and the encoder 161 is also connected to the control device 90 via the motor drive circuit 16a.

[0133] Furthermore, a potentiometer 67 is connected to the control device 90 via an interface 67 a , and the potentiometer 67 detects the sewing pitch of the main feed teeth 31 currently set by the feed adjustment dial 64 .

[0134] Furthermore, a setting input unit 95 for inputting execution and setting of various operation controls for the differential feed sewing machine 100 is connected to the control device 90 via an interface 95 a .

[0135] The setting input unit 95 is composed of, for example, a liquid crystal display (LCD) with a touch panel, and functions as a display unit and an input unit. The display unit displays various setting screens, the operating state of the differential feed sewing machine, etc. according to the display control signal input from the CPU 91. The input unit is composed of a touch sensor attached to the display surface of the display unit for detecting touch operations, and can cooperate with the input screen displayed on the display unit to accept various inputs.

[0136] For example, the setting input unit 95 can set the sewing pitch of the main feed teeth 31 and the sub-feed teeth 32 .

[0137] [Control when setting the sewing pitch]

[0138] Figure 8 This is a display example of the setting screen G1 for setting the sewing pitch of the auxiliary feed teeth 32 in the setting input unit 95 .

[0139] As shown in the setting screen G1, the setting input unit 95 can input the sewing pitch of the auxiliary feed teeth 32 with a numerical value indicating the size of the pitch width. In addition, the "input with a numerical value indicating the size of the pitch width" mentioned here means inputting a numerical value indicating the size (length) of the pitch width of the sewing pitch of the auxiliary feed teeth 32, indicating that the setting is not included in the case of setting the ratio of the sewing pitch of the auxiliary feed teeth 32 to the sewing pitch of the main feed teeth 31.

[0140] That is, in the setting input unit 95 , when the setting screen G1 is displayed, the sewing pitch of the auxiliary feed teeth 32 can be input as a numerical value indicating the pitch width in units of 0.1 [mm].

[0141] Fig. 9 This is a flowchart showing the control performed by the CPU 91 of the control device 90 when setting the sewing pitch of the main feed teeth 31 and the sewing pitch of the auxiliary feed teeth 32. This control is achieved by the CPU 91 executing a control program stored in the data memory 94. In addition, this control is repeatedly performed in a short cycle.

[0142] In addition, the sewing pitch of the main feed teeth 31 and the sewing pitch of the auxiliary feed teeth 32 are based on the premise that the set values ​​that have been set are saved as data. Assuming that the sewing pitch of the auxiliary feed teeth 32 is set to a default value when no setting operation has been performed in the past, the sewing pitch of the main feed teeth 31 is periodically read by the potentiometer 67 and obtained in advance.

[0143] The CPU 91 determines whether a numerical value of the sewing pitch of the auxiliary feed teeth 32 has been input from the setting screen G1 of the setting input unit 95 (step S1 ), and if not, the process proceeds to step S11 .

[0144] On the other hand, if the sewing spacing of the auxiliary feed teeth 32 is input, the CPU 91 reads the detection value of the potentiometer 67 of the first feed adjustment mechanism 60 (step S3), refers to the table data representing the correlation between the detection value of the potentiometer 67 and the set sewing spacing of the main feed teeth 31, and obtains the current sewing spacing of the main feed teeth 31 set by the feed adjustment dial 64 (step S5).

[0145] Then, the CPU 91 calculates the ratio of the sewing pitch of the auxiliary feed teeth 32 set on the setting screen G1 to the current sewing pitch of the main feed teeth 31 (step S7 ).

[0146] Then, the CPU 91 refers to the table data indicating the ratio of the sewing pitch of the auxiliary feed teeth 32 to the sewing pitch of the aforementioned main feed teeth 31 and the axial angle of the output shaft of the auxiliary feed tooth adjusting motor 82, and executes control to rotate the axial angle of the output shaft of the auxiliary feed tooth adjusting motor 82 so as to obtain the ratio of the sewing pitch of the auxiliary feed teeth 32 set from the setting screen G1 calculated in step S7 to the current sewing pitch of the main feed teeth 31 (step S9).

[0147] Thus, the shaft angle of the output shaft of the auxiliary feed teeth adjustment motor 82 is adjusted so that the sewing pitch of the auxiliary feed teeth 32 coincides with the numerical value indicating the size of the pitch width input from the setting screen G1, and the control ends.

[0148] On the other hand, in step S1, when it is determined that the numerical value of the sewing pitch of the auxiliary feed teeth 32 has not been input from the setting screen G1 of the setting input unit 95, the CPU 91 reads the detection value of the potentiometer 67 of the first feed adjustment mechanism 60 (step S11), and determines whether the sewing pitch of the main feed teeth 31 has changed (step S13).

[0149] If the sewing pitch of the main feed teeth 31 is not changed, the process returns to step S1. If the sewing pitch of the main feed teeth 31 is changed, the new sewing pitch of the main feed teeth 31 is obtained based on the detection value of the potentiometer 67, and the recorded data of the sewing pitch of the main feed teeth 31 is updated (step S15).

[0150] Then, the CPU 91 calculates the ratio of the current sewing pitch of the auxiliary feed teeth 32 to the new sewing pitch of the main feed teeth 31 (step S17 ).

[0151] Then, the CPU 91 refers to the table data representing the correlation between the aforementioned ratio and the shaft angle of the output shaft of the auxiliary feed tooth adjusting motor 82, and based on the ratio of the sewing pitch of the auxiliary feed teeth 32 relative to the sewing pitch of the changed main feed teeth 31 calculated in step S17, performs control to rotate the output shaft of the auxiliary feed tooth adjusting motor 82 so as to achieve a shaft angle that can maintain the currently set sewing pitch of the auxiliary feed teeth 32 (step S19).

[0152] Thus, even when only the sewing pitch of the main feed teeth 31 is changed, adjustment is performed so that the sewing pitch of the sub-feed teeth 32 is maintained at the set value, and the control ends.

[0153] [Technical Effects of Embodiments of the Invention]

[0154] As described above, since the differential feed sewing machine 100 adjusts the sewing pitch of the auxiliary feed teeth 32 through the auxiliary feed tooth adjustment motor 82, as long as the setting content of the sewing pitch of the auxiliary feed teeth 32 is constant, it can be adjusted to a constant sewing pitch, and compared with the case of manual adjustment, the reproducibility of the feeding action during sewing can be improved.

[0155] Furthermore, since the setting input unit 95 can input the setting of the sewing pitch based on the auxiliary feed teeth 32 using a numerical value indicating the size of the pitch width, it is possible to further improve the reproducibility.

[0156] Furthermore, since the setting input unit 95 is not a structure for setting the sewing pitch based on the auxiliary feed teeth 32 based on the ratio of the sewing pitch relative to the main feed teeth 31, when the size of the target pitch width required for sewing as the sewing pitch of the auxiliary feed teeth 32 is known, there is no need to calculate based on the ratio value, which can eliminate the complexity of the sewing pitch setting operation and make it easy and quick to perform.

[0157] In addition, since the differential feed sewing machine 100 is a structure in which the second horizontal feed mechanism 70 obtains the driving force for the reciprocating movement of the auxiliary feed teeth 32 in the front-to-back direction from the intermediate force like the relay arm 54 of the first horizontal feed mechanism 50, if the sewing pitch of the main feed teeth 31 is changed, the sewing pitch of the auxiliary feed teeth 32 will also change in conjunction.

[0158] Therefore, when the setting input unit of the sewing pitch of the main feed teeth 31 is a mechanical type, it may be difficult to perform control so that the sewing pitch of the sub-feed teeth 32 matches the target setting value.

[0159] Therefore, the differential feed sewing machine 100 is provided with a potentiometer 67 as a detection unit for detecting the set value of the sewing spacing of the main feed teeth 31, so that the control device 90 can identify the set value of the sewing spacing of the main feed teeth 31, thereby being able to well control the sewing spacing of the auxiliary feed teeth 32 to match the set value as the target.

[0160] In addition, since the control device 90 controls the sub-feed tooth adjustment motor 82 to maintain the already set sewing pitch of the sub-feed teeth 32 when only the sewing pitch setting of the main feed teeth 31 is changed, proper sewing can be performed when one does not want to change the sewing pitch of the sub-feed teeth 32 but only wants to change the sewing pitch of the main feed teeth 31.

[0161] In addition, at this time, the trouble of re-calculating and re-setting the auxiliary feed teeth 32 even if one only wants to change the sewing pitch of the main feed teeth 31 is eliminated, and the complexity of the setting operation can be eliminated, and the setting operation can be performed easily and smoothly.

[0162] [other]

[0163] The above describes the various embodiments of the present invention. However, the present invention is not limited to the above embodiments. For example, in the embodiments, the structural element formed by a single component can also be replaced by a structural element that is divided into multiple components and connected or fixed to each other. In addition, the structural element composed of multiple components connected can also be replaced by a structural element formed by a single component. In addition, the details shown in the embodiments can be appropriately changed within the scope of the main purpose of the invention.

[0164] For example, in the above-mentioned differential feed sewing machine 100, a structure is adopted in which the sewing pitch of the main feed teeth 31 is adjusted by manual operation of the feed adjustment dial 64, but the present invention is not limited to this.

[0165] For example, a motor that rotates the feed adjustment body 63 about an axis along the left-right direction and whose movement amount can be controlled may be installed, and the sewing pitch of the main feed teeth 31 may be adjusted by controlling the shaft angle of the motor.

[0166] In this case, if Fig.10 As shown, a setting screen G2 may be displayed on the setting input unit 95, in which both the sewing pitch of the main feed teeth 31 and the sewing pitch of the auxiliary feed teeth 32 can be input with numerical values ​​indicating the size of the pitch width.

[0167] Thus, for both the sewing pitch of the main feed teeth 31 and the sewing pitch of the auxiliary feed teeth 32 , a numerical value indicating the pitch width in units of 0.1 [mm] can be input.

Claims

1. A differential feed sewing machine, characterized in that: have: A feeding mechanism having main feeding teeth and auxiliary feeding teeth for feeding on the downstream side and the upstream side of the feeding direction of the sewn article; The first feed adjustment mechanism adjusts the sewing spacing of the main feed teeth to any size: The second feed adjustment mechanism adjusts the sewing spacing of the auxiliary feed teeth to any size. The second feed adjustment mechanism adjusts the sewing spacing of the auxiliary feed teeth through an actuator. It is provided with: a setting input part, which sets and inputs the sewing pitch of the auxiliary feed teeth; A control device controls the actuator so as to achieve the sewing pitch of the auxiliary feed teeth input from the setting input unit.

2. The differential feed sewing machine according to claim 1, characterized in that: The setting input unit can input a setting of the sewing pitch of the auxiliary feed teeth using a numerical value indicating a size of a pitch width.

3. The differential feed sewing machine according to claim 2, characterized in that: The control device controls the actuator so as to maintain the already set sewing pitch of the auxiliary feed teeth when only the setting of the sewing pitch of the main feed teeth is changed.

4. The differential feed sewing machine according to claim 3, characterized in that: A detection unit is provided for detecting a set value of a sewing pitch of the main feed teeth.

Images