US20220290347A1 - Driving device used in sewing apparatus - Google Patents

Driving device used in sewing apparatus Download PDF

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Publication number
US20220290347A1
US20220290347A1 US17/672,764 US202217672764A US2022290347A1 US 20220290347 A1 US20220290347 A1 US 20220290347A1 US 202217672764 A US202217672764 A US 202217672764A US 2022290347 A1 US2022290347 A1 US 2022290347A1
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US
United States
Prior art keywords
shaft
eccentric
driven shaft
cylindrical portion
sewing
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
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US17/672,764
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English (en)
Inventor
Taisuke Morimoto
Yosuke IKADAI
Kazuma NAKAYAMA
Tohru Takamura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
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Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Assigned to HONDA MOTOR CO., LTD. reassignment HONDA MOTOR CO., LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: IKADAI, YOSUKE, MORIMOTO, TAISUKE, NAKAYAMA, KAZUMA, TAKAMURA, TOHRU
Publication of US20220290347A1 publication Critical patent/US20220290347A1/en
Abandoned legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B69/00—Driving-gear; Control devices
    • D05B69/10—Electrical or electromagnetic drives
    • D—TEXTILES; PAPER
    • D05—SEWING; EMBROIDERING; TUFTING
    • D05B—SEWING
    • D05B55/00—Needle holders; Needle bars
    • D05B55/14—Needle-bar drives

Definitions

  • the present invention relates to a driving device used in a sewing apparatus that includes an eccentric member for reciprocating a needle up and down and forms stitches on a workpiece.
  • an instrument panel has been used in a vehicle interior of an automobile.
  • a skin material is sewn on the surface of the instrument panel using a sewing apparatus.
  • a sewing apparatus disclosed in JP 2004-065844 A includes a sewing machine unit and an eccentric mechanism.
  • the sewing machine unit includes a needle for sewing the skin material.
  • the eccentric mechanism converts a rotational driving force from a driving source into an up and down linear motion.
  • the eccentric mechanism transmits the rotational driving force of the driving source to the sewing machine unit.
  • the needle reciprocates up and down by the eccentric mechanism.
  • the eccentric mechanism includes an eccentric shaft, an eccentric, and a connecting rod.
  • the eccentric shaft is rotatably supported by a base.
  • the eccentric shaft is rotated by the driving force from the driving source.
  • the eccentric shaft is inserted through the eccentric.
  • One end portion of the connecting rod is connected to the eccentric.
  • the other end portion of the connecting rod is connected to a slider.
  • the slider is movable up and down.
  • the eccentric includes a bearing tube portion and an eccentric tube portion.
  • the bearing tube portion has a circular cross section.
  • a through hole is provided in an axial center of the bearing tube portion.
  • the eccentric tube portion has a circular cross section and is eccentric to the radially outer side of the bearing tube portion.
  • the through hole penetrates from the bearing tube portion to the eccentric tube portion.
  • the eccentric When the driving source is driven to rotate the eccentric shaft, the eccentric rotates together with the eccentric shaft. With the rotation of the eccentric, the connecting rod connected to the eccentric tube portion reciprocates up and down. Thus, the up and down reciprocating motion of the connecting rod is transmitted to the slider. With the reciprocating motion of the slider, the needle of the sewing machine unit moves up and down via a connecting bar. As the needle moves up and down, the skin material is sewn.
  • An object of the present invention is to solve the above-described problems.
  • a driving device that is used in a sewing apparatus for sewing a workpiece, and that drives a needle
  • the driving device comprising: a driving source configured to be driven to rotate when energized; a shaft connected to the driving source and configured to rotate; and an eccentric member fixed to the shaft and configured to convert a rotational motion of the shaft into an up and down motion of the needle, wherein a cushion member configured to absorb a load applied to the eccentric member in a direction substantially orthogonal to an axial direction of the shaft is disposed between the eccentric member and the shaft.
  • the driving device used in the sewing apparatus comprises the eccentric member.
  • the eccentric member As a result, when the driving source is driven to rotate the shaft, the rotational motion of the shaft is converted into the up and down motion of the needle by the eccentric member. At this time, a load in a direction substantially orthogonal to the axial direction of the shaft is applied to the eccentric member.
  • the cushion member is disposed between the eccentric member and the shaft. Thus, the load can be suitably absorbed by the cushion member.
  • FIG. 1 is a schematic configuration diagram showing a sewing mechanism of a sewing apparatus according to an embodiment of the present invention
  • FIG. 2 is an enlarged front view showing one end side of a connecting rod and an eccentric member constituting the sewing mechanism of FIG. 1 ;
  • FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2 ;
  • FIGS. 4A, 4B, 4C, and 4D are diagrams illustrating the operation of the eccentric member shown in FIG. 2 .
  • a sewing apparatus 10 sews a skin material 14 on the surface of a workpiece 12 that is an object to be sewn.
  • the workpiece 12 is an instrument panel mounted in a vehicle interior of an automobile.
  • the sewing apparatus 10 forms stitches along a sewing line (not shown) on the outer surface of the skin material 14 of the instrument panel serving as the workpiece 12 .
  • the sewing apparatus 10 includes a casing 16 , a sewing mechanism 18 , and a moving robot 20 .
  • the sewing mechanism 18 is attached to the casing 16 .
  • the sewing mechanism 18 functions as a driving device.
  • the moving robot 20 is a moving mechanism that moves the sewing mechanism 18 .
  • the sewing mechanism 18 and the moving robot 20 are electrically connected to a control unit (not shown).
  • the sewing mechanism 18 and the moving robot 20 are operated under the control of the control unit.
  • the sewing mechanism 18 is attached to a tip arm 22 of the moving robot 20 .
  • an end on one side in the width direction (an arrow B 1 side) of the sewing apparatus 10 where the sewing mechanism 18 is disposed is referred to as a distal end.
  • An end on the other side in the width direction (an arrow B 2 side) where the moving robot 20 is disposed is referred to as a proximal end.
  • the casing 16 has a U-shape that is open laterally in a side view seen from the width direction.
  • the casing 16 is hollow.
  • the casing 16 includes a vertical frame portion 24 , a lower frame portion 26 , and an upper frame portion 28 .
  • the vertical frame portion 24 extends in a vertical direction (directions of arrows A 1 and A 2 ).
  • the lower frame portion 26 extends in the horizontal direction (directions of arrows B 1 and B 2 ) from the lower end of the vertical frame portion 24 .
  • the upper frame portion 28 extends in the horizontal direction from the upper end of the vertical frame portion 24 .
  • the upper frame portion 28 and the lower frame portion 26 are separated from each other by a predetermined distance in the vertical direction.
  • the upper frame portion 28 and the lower frame portion 26 are parallel to each other.
  • the casing 16 includes a first protruding portion 30 .
  • the first protruding portion 30 is disposed at the distal end of the lower frame portion 26 .
  • the first protruding portion 30 protrudes upward (in an arrow A 1 direction) from the lower frame portion 26 by a predetermined height.
  • the distal end of the upper frame portion 28 includes a second protruding portion 32 .
  • the second protruding portion 32 is disposed to face the first protruding portion 30 in the vertical direction.
  • the second protruding portion 32 protrudes downward (in an arrow A 2 direction) from the upper frame portion 28 by a predetermined height.
  • the inside of the first protruding portion 30 , the inside of the lower frame portion 26 , the inside of the vertical frame portion 24 , the inside of the upper frame portion 28 , and the inside of the second protruding portion 32 communicate with one another.
  • the sewing mechanism 18 includes a driving source 34 , two sewing machine needles (needles) 36 a and 36 b , a post bed 38 , a first power transmission mechanism 40 , and a second power transmission mechanism 44 .
  • the post bed 38 is disposed so as to face the two sewing machine needles 36 a and 36 b .
  • the post bed 38 houses two loopers 42 a and 42 b .
  • the first power transmission mechanism 40 transmits the driving force of the driving source 34 to the sewing machine needles 36 a and 36 b .
  • the second power transmission mechanism 44 transmits the driving force of the driving source 34 to the two loopers 42 a and 42 b.
  • the driving source 34 is, for example, a motor that is driven to rotate when energized.
  • the driving source 34 includes a drive shaft 46 that rotates.
  • the driving source 34 is housed in the vicinity of the distal end in the upper frame portion 28 .
  • the drive shaft 46 of the driving source 34 is disposed to face the distal end of the upper frame portion 28 .
  • the driving source 34 is disposed such that the drive shaft 46 of the driving source 34 extends horizontally.
  • the distal end of the drive shaft 46 is connected, via a joint 48 , to a first driven shaft 56 (described later) of the first power transmission mechanism 40 .
  • the sewing machine needles 36 a and 36 b extend in the vertical direction (the directions of arrows A 1 and A 2 ).
  • the sewing machine needle 36 a and the sewing machine needle 36 b are disposed parallel to each other while being separated from each other in the horizontal direction (the directions of arrows B 1 and B 2 ).
  • Upper ends of the sewing machine needles 36 a and 36 b are held by a needle holder 50 .
  • the sewing machine needles 36 a and 36 b protrude downward (in the arrow A 2 direction) from the lower surface of the needle holder 50 .
  • a sewing thread 52 a is inserted through a hole (not shown) of the sewing machine needle 36 a .
  • a sewing thread 52 b is inserted through a hole (not shown) of the sewing machine needle 36 b.
  • the needle holder 50 is disposed below the lower end of the second protruding portion 32 .
  • the needle holder 50 is connected to the lower end of a reciprocating shaft 100 (described later) of the first power transmission mechanism 40 .
  • the post bed 38 is housed inside the first protruding portion 30 .
  • the two loopers 42 a and 42 b and a part of the second power transmission mechanism 44 are housed inside the post bed 38 .
  • the loopers 42 a and 42 b are disposed in the vicinity of the upper end of the first protruding portion 30 .
  • the looper 42 a and the looper 42 b are disposed substantially parallel to each other while being separated from each other in the horizontal direction.
  • the loopers 42 a and 42 b are rotatably supported within the post bed 38 via a rotating shaft 54 .
  • Claw portions (not shown) protruding along the rotation direction are respectively provided on outer peripheral portions of the loopers 42 a and 42 b .
  • the looper 42 a is disposed below the sewing machine needle 36 a .
  • the looper 42 b is disposed below the sewing machine needle 36 b.
  • the loopers 42 a and 42 b are aligned with the sewing machine needles 36 a and 36 b , respectively in the vertical direction.
  • the loopers 42 a and 42 b rotate with the claw portions taking the lead in the rotation.
  • tips of the sewing machine needles 36 a and 36 b are inserted from the outer surface toward the inner surface of the workpiece 12 .
  • the sewing threads 52 a and 52 b inserted through the sewing machine needles 36 a and 36 b are caught on the claw portions.
  • the first power transmission mechanism 40 is housed inside the upper frame portion 28 and the second protruding portion 32 in the casing 16 .
  • the first power transmission mechanism 40 includes the first driven shaft 56 , a second driven shaft (shaft) 60 , and an eccentric mechanism 62 .
  • the first driven shaft 56 is connected to the drive shaft 46 of the driving source 34 .
  • the second driven shaft 60 is disposed in parallel to the first driven shaft 56 .
  • the driving force is transmitted from the first driven shaft 56 to the second driven shaft 60 via a first transmission belt 58 .
  • the eccentric mechanism 62 is connected to the second driven shaft 60 .
  • the eccentric mechanism 62 transmits the driving force from the second driven shaft 60 to the sewing machine needles 36 a and 36 b.
  • Each of the first and second driven shafts 56 and 60 is formed from a metallic material.
  • the first and second driven shafts 56 and 60 are housed in the upper frame portion 28 of the casing 16 .
  • the first driven shaft 56 is disposed in alignment with the drive shaft 46 .
  • the first driven shaft 56 is connected to the drive shaft 46 via the joint 48 .
  • a first pulley 64 is mounted to the distal end of the first driven shaft 56 .
  • the second driven shaft 60 is disposed below the first driven shaft 56 (in the arrow A 2 direction).
  • the first driven shaft 56 and the second driven shaft 60 are separated from each other by a predetermined distance in the vertical direction and substantially parallel to each other.
  • the second driven shaft 60 is elongated along the axial direction (the directions of arrows B 1 and B 2 ).
  • the proximal end of the second driven shaft 60 extends to the vicinity of the proximal end of the upper frame portion 28 .
  • a second pulley 66 is mounted to the distal end of the second driven shaft 60 .
  • a third pulley 68 is mounted to the proximal end of the second driven shaft 60 .
  • An annular second transmission belt 70 is mounted on the outer periphery of the third pulley 68 .
  • the first transmission belt 58 has an annular shape having a predetermined width.
  • the first transmission belt 58 is wound between the first pulley 64 and the second pulley 66 .
  • the driving force of the driving source 34 is transmitted to the first driven shaft 56 .
  • the driving force is transmitted to the second driven shaft 60 via the first pulley 64 , the first transmission belt 58 , and the second pulley 66 .
  • the second driven shaft 60 rotates.
  • the eccentric mechanism 62 includes an eccentric member 72 , a connecting rod 74 , a transmission shaft 76 , and a fixing screw (fixing member) 78 .
  • the eccentric member 72 is fixed to the second driven shaft 60 .
  • One end of the connecting rod 74 is connected to the eccentric member 72 .
  • the other end of the connecting rod 74 is connected to the transmission shaft 76 .
  • the fixing screw 78 is screwed into the eccentric member 72 .
  • the eccentric member 72 includes a first cylindrical portion 82 and a second cylindrical portion 84 .
  • the first cylindrical portion 82 includes a shaft hole 80 penetrating through an axial center L 1 of the first cylindrical portion 82 .
  • the second cylindrical portion 84 protrudes from the axial end face of the first cylindrical portion 82 in the proximal end direction (in an arrow B 2 direction, toward one axial end side) along the axial direction of the shaft hole 80 .
  • the second cylindrical portion 84 is radially eccentric from the axial center L 1 of the first cylindrical portion 82 .
  • the cross-sectional shape of each of the first cylindrical portion 82 and the second cylindrical portion 84 is circular when viewed from the axial direction shown in FIG. 2 .
  • the shaft hole 80 has a constant diameter and extends along the axial direction (the directions of arrows B 1 and B 2 ).
  • the second driven shaft 60 can be inserted through the shaft hole 80 .
  • the shaft hole 80 penetrates from the first cylindrical portion 82 to the second cylindrical portion 84 .
  • the inner diameter of the shaft hole 80 is larger than the outer diameter of the second driven shaft 60 .
  • a clearance C (see FIG. 3 ) is provided between the inner peripheral surface of the shaft hole 80 and the outer peripheral surface of the second driven shaft 60 .
  • the clearance C has a predetermined width in the radial direction.
  • the shaft hole 80 includes a first hole portion 86 and a second hole portion 88 .
  • the first hole portion 86 is disposed inside the first cylindrical portion 82 .
  • the second hole portion 88 is disposed inside the second cylindrical portion 84 .
  • One end of the first hole portion 86 opens at one axial end of the eccentric member 72 (an end on the distal end side, the arrow B 1 side).
  • One end of the second hole portion 88 opens at the other axial end of the eccentric member 72 (an end on the proximal end side, the arrow B 2 side).
  • the shaft hole 80 opens to the axial center L 1 of the first cylindrical portion 82 .
  • the shaft hole 80 opens at a position radially eccentric from an axial center L 2 of the second cylindrical portion 84 (see FIG. 2 ).
  • the second hole portion 88 includes an annular groove 90 .
  • the annular groove 90 is disposed in the second hole portion 88 on the proximal end side (the arrow B 2 side) of the eccentric member 72 .
  • the annular groove 90 is recessed radially outward from the inner peripheral surface of the second hole portion 88 .
  • a ring-shaped cushion member 92 is mounted in the annular groove 90 .
  • the cushion member 92 is formed of an incompressible elastic material (incompressible material) such as rubber or silicone.
  • the cushion member 92 has an annular shape.
  • the outer peripheral surface of the cushion member 92 abuts against the inner peripheral surface of the annular groove 90 and is held in the annular groove 90 .
  • the inner peripheral surface of the cushion member 92 protrudes further inward in the radial direction than the inner peripheral surface of the second hole portion 88 .
  • the inner peripheral surface of the cushion member 92 is slidable on the outer peripheral surface of the second driven shaft 60 .
  • the cushion member 92 is not limited to being mounted to the eccentric member 72 .
  • the cushion member 92 may be mounted to the outer peripheral surface of the second driven shaft 60 .
  • the cushion member 92 is not limited to being a single member and having an annular shape. For example, a plurality of the cushion members 92 may be scattered along the inner peripheral surface of the second hole portion 88 .
  • the first cylindrical portion 82 includes a screw hole 94 .
  • the screw hole 94 penetrates radially inward from the outer peripheral surface of the first cylindrical portion 82 .
  • the screw hole 94 extends in the radial direction orthogonal to the shaft hole 80 .
  • the screw hole 94 penetrates from the outer peripheral surface of the first cylindrical portion 82 to the shaft hole 80 .
  • the fixing screw 78 can be screwed into the screw hole 94 .
  • the fixing screw 78 is a shaft having a substantially constant diameter.
  • the outer peripheral surface of the fixing screw 78 has threads.
  • the fixing screw 78 is screwed into the screw hole 94 from the outer peripheral surface of the first cylindrical portion 82 .
  • the fixing screw 78 is movable in the radial direction orthogonal to the axis of the shaft hole 80 .
  • the fixing screw 78 is screwed.
  • the fixing screw 78 is moved radially inward, that is, toward the second driven shaft 60 .
  • the tip of the fixing screw 78 comes into contact with the outer peripheral surface of the second driven shaft 60 . Therefore, the eccentric member 72 and the second driven shaft 60 do not rotate relative to each other, and the eccentric member 72 and the second driven shaft 60 are fixed relative to each other.
  • the clearance C is provided between the shaft hole 80 of the eccentric member 72 and the second driven shaft 60 . That is, the fixing screw 78 is a fixing member that fixes the second driven shaft 60 and the eccentric member 72 without causing relative rotation therebetween.
  • the connecting rod 74 extends in the vertical direction (the directions of arrows A 1 and A 2 ).
  • One end of the connecting rod 74 in the longitudinal direction includes a first annular portion 96 .
  • the other end of the connecting rod 74 in the longitudinal direction includes a second annular portion 98 .
  • Each of the first and second annular portions 96 and 98 has an annular shape.
  • the first annular portion 96 is disposed facing upward (in the arrow A 1 direction) inside the second protruding portion 32 .
  • the second cylindrical portion 84 of the eccentric member 72 is inserted into the first annular portion 96 .
  • the second annular portion 98 is disposed facing downward (in the arrow A 2 direction) inside the second protruding portion 32 .
  • the proximal end of the transmission shaft 76 is inserted into the second annular portion 98 .
  • the first annular portion 96 is rotatably connected to the second cylindrical portion 84 of the eccentric member 72 .
  • the second annular portion 98 is rotatably connected to the transmission shaft 76 .
  • the connecting rod 74 connects the second driven shaft 60 and the transmission shaft 76 .
  • the connecting rod 74 can transmit the driving force, which is transmitted to the second driven shaft 60 , to the transmission shaft 76 .
  • the transmission shaft 76 extends in the horizontal direction (the directions of arrows B 1 and B 2 ) inside the second protruding portion 32 .
  • the proximal end of the transmission shaft 76 is rotatably supported by the second annular portion 98 of the connecting rod 74 .
  • the reciprocating shaft 100 is supported at the distal end of the transmission shaft 76 .
  • the reciprocating shaft 100 extends in the vertical direction (the directions of arrows A 1 and A 2 ) inside the second protruding portion 32 .
  • the needle holder 50 is mounted to the lower end of the reciprocating shaft 100 .
  • the second power transmission mechanism 44 is housed inside the lower frame portion 26 and the first protruding portion 30 in the casing 16 .
  • the second power transmission mechanism 44 includes a third driven shaft 102 .
  • the third driven shaft 102 extends along the lower frame portion 26 .
  • the third driven shaft 102 is separated from the second driven shaft 60 in the vertical direction and is substantially parallel to the second driven shaft 60 .
  • a fourth pulley 104 is connected to the proximal end of the third driven shaft 102 .
  • a fifth pulley 106 is connected to the distal end of the third driven shaft 102 .
  • the second transmission belt 70 is wound between the fourth pulley 104 and the third pulley 68 .
  • the second power transmission mechanism 44 includes a fourth driven shaft 108 , a third transmission belt 112 , a first gear 114 , and a second gear 116 .
  • the fourth driven shaft 108 is disposed substantially parallel to the third driven shaft 102 inside the first protruding portion 30 .
  • a sixth pulley 110 is connected to the proximal end of the fourth driven shaft 108 .
  • the third transmission belt 112 is wound around the fifth pulley 106 and the sixth pulley 110 .
  • the first gear 114 is fitted onto the fourth driven shaft 108 .
  • the second gear 116 and the first gear 114 mesh with each other.
  • the fourth driven shaft 108 is separated upward (in the arrow A 1 direction) from the third driven shaft 102 by a predetermined distance.
  • the fourth driven shaft 108 is substantially parallel to the third driven shaft 102 .
  • the fourth driven shaft 108 is rotatably supported in the first protruding portion 30 .
  • the outer peripheral surface of the first gear 114 has a plurality of first tooth portions (not shown) along the outer peripheral surface.
  • the first gear 114 is disposed at the axial center of the fourth driven shaft 108 .
  • the first gear 114 is disposed adjacent to the sixth pulley 110 .
  • the first gear 114 rotates together with the fourth driven shaft 108 .
  • the second gear 116 is connected to the axial center of the rotating shaft 54 .
  • the rotating shaft 54 is disposed above the fourth driven shaft 108 .
  • the rotating shaft 54 and the fourth driven shaft 108 are separated from each other in the vertical direction and are substantially parallel to each other.
  • the outer peripheral surface of the second gear 116 has a plurality of second tooth portions (not shown) along the outer peripheral surface.
  • the second tooth portions of the second gear 116 and the first tooth portions of the first gear 114 mesh with each other.
  • the two loopers 42 a and 42 b are mounted to both ends of the rotating shaft 54 in the width direction so as to sandwich the second gear 116 .
  • the rotating shaft 54 rotates together with the second gear 116 , whereby the two loopers 42 a and 42 b rotate.
  • the moving robot 20 is operated under the control of a control unit (not shown).
  • the tip arm 22 of the moving robot 20 is brought close to the workpiece 12 .
  • the post bed 38 (loopers 42 a and 42 b ) and the sewing machine needles 36 a and 36 b are disposed at positions sandwiching the sewing line along which sewing is performed in the workpiece 12 . That is, the two loopers 42 a and 42 b and the two sewing machine needles 36 a and 36 b are respectively disposed above and below the workpiece 12 (in the directions of arrows A 1 and A 2 ).
  • the sewing threads 52 a and 52 b are passed through the holes (not shown) of the sewing machine needles 36 a and 36 b , respectively, in advance.
  • the driving source 34 is driven based on a control signal from the control unit (not shown).
  • the drive shaft 46 of the driving source 34 rotates.
  • the first driven shaft 56 and the first pulley 64 rotate together with the drive shaft 46 .
  • the first transmission belt 58 revolves.
  • the second pulley 66 rotates via the first transmission belt 58
  • the second driven shaft 60 is driven to rotate together with the second pulley 66 .
  • the eccentric member 72 rotates with the rotation of the second driven shaft 60 .
  • the first cylindrical portion 82 of the eccentric member 72 is disposed coaxially with the second driven shaft 60 . Therefore, the eccentric member 72 rotates about the axial center L 1 of the first cylindrical portion 82 .
  • the second cylindrical portion 84 of the eccentric member 72 turns at a position eccentric radially outward from the second driven shaft 60 .
  • the first annular portion 96 of the connecting rod 74 moves together with the second cylindrical portion 84 along a substantially elliptical trajectory that turns at a position eccentric from the axial center L 1 of the second driven shaft 60 .
  • the connecting rod 74 performs a turning motion while reciprocating up and down along a substantially elliptical trajectory.
  • a load F is applied to the second cylindrical portion 84 of the eccentric member 72 from the first annular portion 96 toward the second annular portion 98 .
  • the load F is applied by the gravity acting on the connecting rod 74 .
  • the second cylindrical portion 84 is pressed radially inward and is bent.
  • the annular cushion member 92 made of an incompressible material is disposed in the second hole portion 88 of the second cylindrical portion 84 . Therefore, even if the second cylindrical portion 84 deforms and is bent radially inward, contact between the second cylindrical portion 84 and the second driven shaft 60 is reliably prevented by the cushion member 92 .
  • the distance by which the cushion member 92 pressed by the load F is compressed in the radial direction is smaller than the radial length of the clearance C between the inner peripheral surface of the first annular portion 96 (the second hole portion 88 ) and the outer peripheral surface of the second driven shaft 60 . Therefore, even when the cushion member 92 is compressed in the radial direction, the predetermined width of the clearance C is maintained. In other words, when the cushion member 92 is compressed in the radial direction, the width of the clearance C does not become 0. Thus, when the load F is applied from the first annular portion 96 toward the second cylindrical portion 84 , contact between the second cylindrical portion 84 and the second driven shaft 60 is prevented by the cushion member 92 .
  • the transmission shaft 76 is supported by the second annular portion 98 of the connecting rod 74 . Therefore, the transmission shaft 76 performs a turning motion along a substantially elliptical trajectory similarly to the connecting rod 74 .
  • the reciprocating shaft 100 reciprocates up and down once in synchronization with one turn of the transmission shaft 76 .
  • the sewing machine needles 36 a and 36 b held by the needle holder 50 also reciprocate up and down once.
  • the third pulley 68 rotates together with the second driven shaft 60 .
  • the second transmission belt 70 revolves and the fourth pulley 104 rotates.
  • the third driven shaft 102 is driven to rotate.
  • the fifth pulley 106 rotates together with the third driven shaft 102
  • the third transmission belt 112 revolves.
  • the sixth pulley 110 , the fourth driven shaft 108 , and the first gear 114 are driven to rotate.
  • the second gear 116 meshing with the first tooth portions of the first gear 114 is driven to rotate.
  • the two loopers 42 a and 42 b fixed to the rotating shaft 54 integrally rotate. Note that the two loopers 42 a and 42 b rotate in synchronization. While the two sewing machine needles 36 a and 36 b reciprocate up and down once, the two loopers 42 a and 42 b rotate once.
  • the sewing machine needles 36 a and 36 b are inserted into the workpiece 12 from the upper surface of the workpiece 12 by advancing along a forward path extending downward from the top dead center located at the uppermost position.
  • the sewing machine needles 36 a and 36 b reach the bottom dead center located at the lowermost position, the tips of the sewing machine needles 36 a and 36 b protrude from the lower surface of the workpiece 12 .
  • the tips of the sewing machine needles 36 a and 36 b protrude from the lower surface of the workpiece 12 and enter the inside of the post bed 38 .
  • the sewing threads 52 a and 52 b inserted through the sewing machine needles 36 a and 36 b penetrate the workpiece 12 .
  • the sewing machine needles 36 a and 36 b advance along a return path extending from the bottom dead center toward the top dead center. While the sewing machine needles 36 a and 36 b are lifted, the sewing machine needles 36 a and 36 b are removed from the post bed 38 and the workpiece 12 .
  • the sewing threads 52 a and 52 b pulled when the sewing machine needles 36 a and 36 b are inserted (when the loopers 42 a and 42 b rotate) next time are inserted into the loop portions, respectively.
  • the moving robot 20 operates as appropriate under the control of the control unit. With the operation of the moving robot 20 , the sewing mechanism 18 moves in parallel along the workpiece 12 . In the sewing mechanism 18 , the sewing machine needles 36 a and 36 b reciprocate, and the loopers 42 a and 42 b repeatedly rotate. As a result, the plurality of loop portions are joined to each other so that sewing is performed on the lower surface of the workpiece 12 .
  • the sewing apparatus 10 includes the sewing mechanism 18 for driving the two sewing machine needles 36 a and 36 b .
  • the sewing mechanism 18 includes the driving source 34 , the second driven shaft 60 , and the eccentric member 72 .
  • the driving source 34 is driven to rotate when energized.
  • the second driven shaft 60 is connected to the drive shaft 46 of the driving source 34 via the first driven shaft 56 and rotates therewith.
  • the eccentric member 72 is fixed to the second driven shaft 60 .
  • the eccentric member 72 converts the rotational motion of the second driven shaft 60 into the up and down motion of the sewing machine needles 36 a and 36 b .
  • the cushion member 92 is disposed between the second driven shaft 60 and the second hole portion 88 into which the second driven shaft 60 is inserted.
  • the driving source 34 is driven to rotate the second driven shaft 60 and the eccentric member 72 .
  • the connecting rod 74 holding the sewing machine needles 36 a and 36 b reciprocates up and down.
  • the load F may be applied to the eccentric member 72 , and the second cylindrical portion 84 may be pressed toward the second driven shaft 60 and deform.
  • the cushion member 92 can prevent contact between the shaft hole 80 of the eccentric member 72 and the outer peripheral surface of the second driven shaft 60 .
  • wear (fretting) of the second driven shaft 60 due to contact between the eccentric member 72 and the second driven shaft 60 is suppressed. This makes it possible to improve the durability of the eccentric member 72 and the second driven shaft 60 .
  • By improving the durability of the eccentric member 72 and the second driven shaft 60 it is possible to reduce the frequency of parts replacement and maintenance man-hours for the eccentric member 72 and the second driven shaft 60 .
  • the eccentric member 72 includes the first cylindrical portion 82 and the second cylindrical portion 84 .
  • the first cylindrical portion 82 is disposed coaxially with the axial center L 1 of the second driven shaft 60 .
  • the second cylindrical portion 84 is disposed closer to the other side in the axial direction of the second driven shaft 60 (the arrow B 2 side) than the first cylindrical portion 82 is.
  • the axial center of the second cylindrical portion 84 is eccentric in the radial direction from the axial center L 1 of the second driven shaft 60 .
  • the first annular portion 96 of the connecting rod 74 is connected to the second cylindrical portion 84 .
  • the cushion member 92 is mounted to the second cylindrical portion 84 .
  • the load F may be applied from the first annular portion 96 to the second cylindrical portion 84 .
  • contact between the second cylindrical portion 84 and the second driven shaft 60 is suitably prevented by the cushion member 92 , and wear of the second cylindrical portion 84 and the second driven shaft 60 can be avoided.
  • the second driven shaft 60 is inserted through the first cylindrical portion 82 and fixed to the first cylindrical portion 82 by the fixing screw 78 in a direction orthogonal to the axial direction of the second driven shaft 60 . Therefore, the eccentric member 72 and the second driven shaft 60 can be more firmly fixed by the fixing screw 78 . As the eccentric member 72 and the second driven shaft 60 are fixed to each other, contact between the eccentric member 72 and the second driven shaft 60 is further suppressed, and wear can be reduced.
  • the annular cushion member 92 is mounted on the inner peripheral surface of the second hole portion 88 inside the second cylindrical portion 84 . As a result, contact between the inner peripheral surface of the second hole portion 88 and the second driven shaft 60 inserted through the second hole portion 88 can be reliably prevented by the cushion member 92 over the entire circumferences of the second hole portion 88 and the second driven shaft 60 .
  • the cushion member 92 is formed from an incompressible elastic material such as rubber or silicone.
  • the above embodiment relates to a driving device that is used in a sewing apparatus ( 10 ) for sewing a workpiece, and that drives a needle ( 36 a , 36 b ), the driving device comprising: a driving source ( 34 ) configured to be driven to rotate when energized; a shaft ( 60 ) connected to the driving source and configured to rotate; and an eccentric member ( 72 ) fixed to the shaft and configured to convert a rotational motion of the shaft into an up and down motion of the needle, wherein a cushion member ( 92 ) configured to absorb a load applied to the eccentric member in a direction substantially orthogonal to an axial direction of the shaft is disposed between the eccentric member and the shaft.
  • the load applied to the eccentric member can be absorbed by the cushion member.
  • contact between the eccentric member and the shaft due to application of the load can be prevented by the cushion member. Therefore, the durability of the eccentric member and the shaft can be improved.
  • the eccentric member includes: a first cylindrical portion ( 82 ) formed coaxially with an axial center of the shaft; and a second cylindrical portion ( 84 ) disposed on one side of the first cylindrical portion in the axial direction of the shaft, and radially eccentric from the axial center of the shaft, wherein the cushion member is disposed in the second cylindrical portion.
  • the eccentric member and the shaft are fixed to each other by a fixing member ( 78 ) provided in the first cylindrical portion.
  • the eccentric member and the shaft can be firmly fixed by the fixing member.
  • contact between the eccentric member and the shaft is further suppressed, and wear of the eccentric member and the shaft can be reduced.
  • the cushion member has an annular shape, contact between the eccentric member and the shaft can be reliably prevented over the entire circumference of the shaft.
  • the cushion member is formed of an incompressible material, when a load is applied to the eccentric member, the load can be suitably absorbed by the cushion member. As a result, the clearance between the eccentric member and the shaft can be constantly maintained by the cushion member to prevent contact therebetween.

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  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Sewing Machines And Sewing (AREA)
US17/672,764 2021-03-10 2022-02-16 Driving device used in sewing apparatus Abandoned US20220290347A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2021-038707 2021-03-10
JP2021038707A JP7241113B2 (ja) 2021-03-10 2021-03-10 縫製装置に用いられる駆動装置

Publications (1)

Publication Number Publication Date
US20220290347A1 true US20220290347A1 (en) 2022-09-15

Family

ID=83194641

Family Applications (1)

Application Number Title Priority Date Filing Date
US17/672,764 Abandoned US20220290347A1 (en) 2021-03-10 2022-02-16 Driving device used in sewing apparatus

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US (1) US20220290347A1 (ja)
JP (1) JP7241113B2 (ja)
CN (1) CN115074921A (ja)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2765759A (en) * 1952-12-17 1956-10-09 Union Special Machine Co Sewing machine
US4483685A (en) * 1983-03-21 1984-11-20 The Singer Company Motor isolator pulley
US6082279A (en) * 1998-06-02 2000-07-04 Brother Kogyo Kabushiki Kaisha Sewing machine with mechanism for retracting feed dog away from upper surface of needle plate

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1660885C3 (de) * 1967-02-03 1973-10-04 Janome Sewing Machine Co. Ltd., Tokio Zickzack Nahmaschine
US5396853A (en) * 1994-03-04 1995-03-14 Huang; Dennis Double-thread hand sewing machine transmission mechanism
JP2004065844A (ja) * 2002-08-09 2004-03-04 Hashima:Kk 縫製機におけるエキセントリック機構
JP4913373B2 (ja) * 2005-01-07 2012-04-11 Ｊｕｋｉ株式会社 ミシンの針駆動機構
CN1948587B (zh) * 2006-11-03 2011-09-14 中捷缝纫机股份有限公司 缝纫机的传动机构
KR20080082361A (ko) * 2007-03-08 2008-09-11 썬스타 특수정밀 주식회사 자수 미싱
JP5859302B2 (ja) * 2011-12-26 2016-02-10 Juki株式会社 ミシン
CN209323136U (zh) * 2018-11-12 2019-08-30 浙江日圣缝纫机科技有限公司 一种缝纫机及其可调针杆装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2765759A (en) * 1952-12-17 1956-10-09 Union Special Machine Co Sewing machine
US4483685A (en) * 1983-03-21 1984-11-20 The Singer Company Motor isolator pulley
US6082279A (en) * 1998-06-02 2000-07-04 Brother Kogyo Kabushiki Kaisha Sewing machine with mechanism for retracting feed dog away from upper surface of needle plate

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JP2022138687A (ja) 2022-09-26
CN115074921A (zh) 2022-09-20
JP7241113B2 (ja) 2023-03-16

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