JP2007175150A - Bearing structure of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce grease consumption on the sliding surface of a rotary shaft and a bearing member and the sliding surface of a rotary member and a support shaft as much as possible, and to improve lubricity and grease retentivity by the rotary shaft, the bearing member of the rotary member and the support shaft. <P>SOLUTION: In the first bearing structure 15 of an electronic sewing machine for supporting a main shaft 6 so as to be rotated around an axial center by the bearing member 16 fixed to a machine frame F, an annular grease housing part 16a for holding grease G is formed on the bearing member 16, a first helical groove 17 is formed on the outer peripheral part of the left side shaft part 6L of the main shaft 6, and a second helical groove 18 is formed on the outer peripheral part of the right side shaft part 6R of the main shaft 6. Thus, when the main shaft 6 is rotated, the grease G on the sliding surface S1 is moved by the first helical groove 17 and the grease G on the sliding surface S2 is moved by the second helical groove 18 respectively to the grease housing part 16a and they are recovered in the grease housing part 16a. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a bearing member or a support shaft fixed to a sewing machine frame, wherein a rotating shaft or a rotating member is rotatably supported using grease.

  Conventionally, in general, in a mechanical drive system, when a rotating shaft that rotates around an axis or a sliding shaft that reciprocates in the axial direction is supported by a bearing member so as to be able to rotate and slide, the rotating shaft or the sliding shaft By using a lubricant such as grease between the rotating shaft or the sliding shaft and the bearing member, the rotating shaft and the sliding shaft are prevented from being seized. . In particular, in industrial sewing machines and household sewing machines, a lubricant used for a bearing sliding surface that supports a spindle that rotates at a high speed or a needle bar that moves up and down at a high speed so as to promote drying. As the grease is adopted.

  For example, the grease supply mechanism for a sewing machine disclosed in Patent Document 1 rotatably supports a main shaft disposed on an arm portion with a bearing member provided on an attachment frame fixed to a sewing machine frame, while an outer peripheral portion of the main shaft. A grease holding groove formed of a spiral groove is formed over a length portion substantially the same as the length of the bearing member.

Therefore, the grease supplied from the grease reservoir formed in the mounting frame is supplied to the grease holding groove through the grease supply passage, and the grease held in the grease holding groove is a lubricating portion between the main shaft and the bearing member. Can be supplied.
JP 2003-326070 A (pages 3 to 4, FIG. 2)

  In the grease supply mechanism of the sewing machine described in Patent Document 1, since the main shaft rotates at a high speed when sewing is started, the grease held in the grease holding groove damages the main shaft and the bearing member due to wear or seizure. Although the grease holding groove is a spiral groove that advances in a predetermined direction, the grease existing between the main shaft and the bearing member is caused by the movement of the spiral groove due to the rotation of the main shaft in the predetermined direction. Thus, it gradually moves to one side in the axial direction of the main shaft and protrudes to the outside of the bearing member.

  That is, the grease supplied to the grease holding groove is used for lubrication in the lubrication portion between the main shaft and the bearing member, and as the main groove rotates in one direction when the main shaft rotates, Is discharged to the outside of the bearing member and is wasted. Furthermore, there is a problem that the amount of grease consumed is increased, the retention of grease in the grease retaining groove is lowered, and the lubricity and durability are lacking.

  An object of the present invention is to reduce grease consumption on the sliding surface between the rotating shaft and the bearing member and the sliding surface between the rotating member and the supporting shaft as much as possible, and to lubricate the rotating shaft and the rotating member with the bearing member and the supporting shaft. To improve the retention and grease retention.

  The bearing structure for a sewing machine according to claim 1 is a bearing structure for a sewing machine in which a rotating shaft is rotatably supported around a shaft center by a bearing member fixed to a sewing machine frame. And a first spiral groove that is formed on an outer peripheral portion of the rotating shaft in contact with the bearing member on one side of the grease housing portion in the axial direction of the rotating shaft and moves the grease toward the grease housing portion when the rotating shaft rotates And a second spiral groove formed on the outer peripheral portion of the rotating shaft in contact with the bearing member on the other side of the grease accommodating portion in the axial direction of the rotating shaft and moving the grease toward the grease accommodating portion when the rotating shaft rotates. Thus, the first spiral groove is provided with a second spiral groove having a reverse spiral.

  A first spiral groove is formed on the outer peripheral portion of the rotating shaft in contact with the bearing member on one side of the grease accommodating portion in the axial direction of the rotating shaft, and a bearing member on the other side of the grease accommodating portion in the axial direction of the rotating shaft. Since the second spiral groove is formed on the outer peripheral portion of the rotating shaft in contact with the shaft, the grease supplied from the annular grease accommodating portion formed on the rotating shaft or the bearing member is supplied and held in the first and second spiral grooves. Is done. Therefore, the grease supplied and held in the first and second spiral grooves is diffused in the form of a thin film in the sliding portion between the rotating shaft and the bearing member, and the rotating shaft rotates smoothly.

  Moreover, the grease diffused in the sliding portion between the rotating shaft and the bearing member passes through the sliding portion between one side of the grease accommodating portion in the axial direction of the rotating shaft and the bearing member, and then from the bearing member. Even in the case of protruding to the outside, during rotation of the rotating shaft, the first spiral groove formed on one side of the rotating shaft causes the grease that is about to protrude to the outside to be forced toward the grease accommodating portion. To be collected without waste.

  Further, the grease diffused in the sliding portion between the rotating shaft and the bearing member passes from the bearing member through the sliding portion between the other side of the grease accommodating portion and the bearing member in the axial direction of the rotating shaft. Even in the case of protruding to the outside, the second spiral groove formed on the other side of the rotating shaft forcibly causes the grease to protrude to the outside toward the grease accommodating portion when the rotating shaft rotates. To be collected without waste.

  A bearing structure for a sewing machine according to a second aspect of the present invention is the bearing structure of the first aspect, wherein the first annular groove is formed on the outer peripheral portion of the rotating shaft and is connected to the end opposite to the grease accommodating portion of the first spiral groove. Of the two spiral grooves, a second annular groove connected to the end opposite to the grease accommodating portion is formed on the outer peripheral portion of the rotating shaft.

  The bearing structure for a sewing machine according to claim 3 is a bearing structure for a sewing machine that rotatably supports a rotating member by a support shaft fixed to the sewing machine frame, and an annular grease accommodating portion formed on the rotating member or the support shaft, and a support A first spiral groove formed on an inner peripheral portion of the rotating member in contact with the support shaft and moving the grease toward the grease accommodating portion when the rotating member rotates, on one side of the grease accommodating portion in the axial direction of the shaft; A second spiral groove formed on the inner peripheral portion of the rotating member in contact with the support shaft on the other side of the grease accommodating portion in the axial direction of the shaft and moving the grease toward the grease accommodating portion when the rotating member rotates. The first spiral groove is provided with a second spiral groove having a reverse spiral.

  A first spiral groove is formed on the inner peripheral portion of the rotating member in contact with the support shaft on one side of the grease storage portion in the axial direction of the support shaft, and the support is provided on the other side of the grease storage portion in the axial direction of the support shaft. Since the second spiral groove is formed in the inner peripheral portion of the rotating member in contact with the shaft, the grease supplied from the annular grease accommodating portion formed in the rotating member or the support shaft is in these first and second spiral grooves. Supply held. Therefore, the grease supplied and held in the first and second spiral grooves is diffused in the form of a thin film in the sliding portion between the rotating member and the support shaft, and the rotating shaft rotates smoothly.

  Moreover, on one side of the grease accommodating portion in the axial direction of the support shaft, the grease that is wasted out by rotating outward from the rotation member via the sliding portion between the support shaft and the rotation member in contact with the rotation is rotated. At the time of rotation of the member, the first spiral groove formed on one side of the rotating member moves toward the grease accommodating portion and is collected without being wasted.

  Furthermore, on the other side of the grease accommodating portion in the axial direction of the support shaft, the grease that is wasted to the outside from the bearing member through the sliding portion between the support shaft and the bearing member in contact with the rotation is rotated. At the time of rotation of the member, the second spiral groove formed on the other side of the rotating member is moved toward the grease accommodating portion and recovered without being wasted.

  A bearing structure for a sewing machine according to a fourth aspect is the invention according to the third aspect, wherein the first annular groove is formed in the inner peripheral portion of the rotating member, and the first annular groove is connected to the end opposite to the grease accommodating portion. In the second spiral groove, a second annular groove connected to the end opposite to the grease accommodating portion is formed on the inner peripheral portion of the rotating member.

  According to the first aspect of the present invention, in the bearing structure of the sewing machine that supports the rotary shaft so as to be rotatable about the axis by the bearing member fixed to the sewing machine frame, the annular grease accommodating portion formed on the rotary shaft or the bearing member. And a first spiral groove formed on an outer peripheral portion of the rotating shaft in contact with the bearing member on one side of the grease housing portion in the axial direction of the rotating shaft and moving the grease toward the grease housing portion when the rotating shaft rotates. The second spiral groove is formed on the outer peripheral portion of the rotating shaft in contact with the bearing member on the other side of the grease accommodating portion in the axial direction of the rotating shaft and moves the grease toward the grease accommodating portion when the rotating shaft rotates. Since the first spiral groove and the second spiral groove opposite to the first spiral groove are provided, the grease supplied from the grease accommodating portion is supplied and held in the first and second spiral grooves, and is supplied to the first and second spiral grooves. Supply Grease is lifting is diffused into a thin film on the sliding portion between the rotating shaft and the bearing member enables smooth rotation of the rotary shaft, lubricity and durability are improved.

  Further, the grease that is wasted out from the bearing member through the sliding portion between the one side and the other side of the grease accommodating portion in the axial direction of the rotating shaft and the bearing member is wasted on one side of the rotating shaft. Further, the first and second spiral grooves formed on the other side forcibly move the grease, which is about to protrude outward from the bearing member, toward the grease accommodating portion, so that it is efficient without wasting the grease. It can be recovered well.

  According to the invention of claim 2, the first annular groove connected to the end opposite to the grease accommodating portion of the first spiral groove is formed on the outer peripheral portion of the rotating shaft, and the grease accommodating of the second spiral groove is formed. Since the second annular groove connected to the end portion on the opposite side to the outer peripheral portion is formed on the outer peripheral portion of the rotating shaft, the grease supplied and held in the first spiral groove moves from the first spiral groove to the opposite side to the grease accommodating portion, and the bearing Even when trying to protrude outward from the member, the grease is accumulated in the first annular groove connected to the first spiral groove, and the protrusion of the grease to the outside can be reliably prevented.

  Furthermore, even when the grease supplied and held in the second spiral groove moves from the second spiral groove to the opposite side to the grease accommodating portion and tries to protrude outward from the bearing member, the grease is not absorbed in the second spiral groove. The second annular groove that continues is accumulated, and the protrusion of grease to the outside can be reliably prevented. Other effects similar to those of the first aspect can be obtained.

  According to the invention of claim 3, in the bearing structure of the sewing machine that rotatably supports the rotating member by the support shaft fixed to the sewing machine frame, the annular grease accommodating portion formed on the rotating member or the support shaft, and the support shaft A first spiral groove formed on an inner peripheral portion of the rotating member in contact with the support shaft and moving the grease toward the grease receiving portion when the rotating member rotates, on one side of the grease receiving portion in the axial direction of the shaft; A second spiral groove formed on the inner peripheral portion of the rotating member in contact with the support shaft and moving the grease toward the grease accommodating portion when the rotating member rotates, on the other side of the grease accommodating portion in the axial direction of Since the first spiral groove and the second spiral groove opposite to the spiral groove are provided, the grease supplied from the grease accommodating portion is supplied and held in the first and second spiral grooves, and supplied and held in the first and second spiral grooves. Guri There is diffused into a thin film on the sliding portion between the supporting shaft and the rotating member enables smooth rotation of the rotating member, lubricity and durability are improved.

  Furthermore, the grease that is wasted to the outside from the rotating member through the sliding portion between the rotating member on one side and the other side of the grease accommodating portion in the axial direction of the supporting shaft and the supporting shaft is used as the rotating member. The first and second spiral grooves formed on one side and the other side of the nozzle forcibly move the grease, which is about to erode out from the rotating member, toward the grease accommodating portion, thereby wasting the grease. Can be efficiently recovered without any problems.

  According to a fourth aspect of the present invention, the first spiral groove is formed in the inner peripheral portion of the rotating member so as to be connected to the end opposite to the grease accommodating portion of the first spiral groove, and the grease of the second spiral groove is formed. Since the second annular groove connected to the end opposite to the housing portion is formed in the inner peripheral portion of the rotating member, the grease supplied and held in the first spiral groove moves from the first spiral groove to the side opposite to the grease housing portion. Thus, even when trying to protrude outward from the rotating member, the grease is accumulated in the first annular groove connected to the first spiral groove, so that the protrusion of the grease to the outside can be reliably prevented. .

  Furthermore, even when the grease supplied and held in the second spiral groove moves from the second spiral groove to the opposite side of the grease accommodating portion and tries to erode out from the rotating member, the grease is not absorbed into the second spiral groove. The second annular groove that continues is accumulated, and the protrusion of grease to the outside can be reliably prevented. Other effects similar to those of the third aspect are achieved.

  While the bearing structure of the sewing machine of the present embodiment supports the main shaft rotatably with a bearing member having a grease accommodating portion, the first spiral groove is formed on the left side of the grease accommodating portion in the axial direction of the main shaft, A second spiral groove is formed on the right side of the grease accommodating portion in the axial direction of the main shaft, and the grease that tries to protrude from the sliding portion between the main shaft and the bearing member to the outside of the bearing member. The second spiral groove can be forcibly recovered in the grease accommodating portion.

  As shown in FIG. 1, the electronic sewing machine 1 includes a bed portion 2 having a thread catcher such as a rotary hook, a leg column portion 3 standing on the right end portion of the bed portion 2, and an upper end of the leg column portion 3. Arm portion 4 extending leftward from the left side. Although not shown in the figure, the bed 2 is provided with a lower shaft that rotates in synchronization with the main shaft 6 (see FIG. 2), and the hook connected to the lower shaft via an intermediate gear (see FIG. 4). A rotary hook or the like that is driven to rotate by a shaft is provided.

  As shown in FIG. 2, a main shaft 6 (which corresponds to a rotation shaft) is disposed in the left-right direction on the arm portion 4, and the main shaft 6 is driven by a first bearing member 16 of a first bearing structure 15 described later. It is supported so as to be rotatable around its axis. The head 5 of the arm 4 is provided with a needle bar vertical movement mechanism 9 that is connected to the left end of the main shaft 6 and drives the needle bar 7 up and down.

  The needle bar vertical movement mechanism 9 will be briefly described. A sewing needle 8 is attached to the lower end of the needle bar 7, and a needle bar holder 10 is fixed to an intermediate part in the height direction of the needle bar 7. On the other hand, a needle bar crank (balance weight) 11 having a connecting pin 11a is fixed to the left end portion of the main shaft 6, and the upper end portion of the needle bar crank rod 12 is rotatably supported by the connecting pin 11a. The lower end of 12 is connected to the needle bar 7 via the needle bar holder 10.

First, the first bearing structure 15 that rotatably supports the main shaft 6 will be described.
As shown in FIGS. 2 and 3, the main shaft 6 disposed horizontally on the arm portion 4 is rotated around the axis by a bearing member (bearing metal) 16 fixed in a penetrating manner to a machine frame (sewing frame) F. It is rotatably supported. In the bearing member 16, an annular grease accommodating portion 16 a having a predetermined width dimension (for example, about 5 to 10 mm) is formed at an approximately central portion in the left-right direction so as to open on a sliding surface with the main shaft 6. .

  A first spiral groove 17 is formed on the outer peripheral portion of the left shaft portion 6 </ b> L in contact with the bearing member 16 on the left side of the grease accommodating portion 16 a in the axial direction (left-right direction) of the main shaft 6. A second spiral groove 18 is formed on the outer peripheral portion of the right shaft portion 6 </ b> R in contact with the bearing member 16 on the right side of the grease accommodating portion 16 a in the axial direction of the main shaft 6.

  Here, when the main shaft 6 rotates in a predetermined direction shown in FIG. 3 (counterclockwise when viewed from the right side), the first spiral groove 17 is a spiral that is directed toward the grease accommodating portion 16a, that is, toward the right side. is there. When the main shaft 6 rotates in a predetermined direction shown in FIG. 3, the second spiral groove 18 is a spiral that is directed toward the grease accommodating portion 16a, that is, toward the left. That is, the second spiral groove 18 has a reverse spiral to the first spiral groove 17.

  Furthermore, a first annular groove 17 a that is connected to the end of the first spiral groove 17 opposite to the grease accommodating portion 16 a, that is, the left end of the first spiral groove 17, is formed on the outer peripheral portion of the main shaft 6. A second annular groove 18 a that is connected to the end of the second spiral groove 18 opposite to the grease accommodating portion 16 a, that is, the right end of the second spiral groove 18, is formed in the outer peripheral portion of the main shaft 6.

Next, the second bearing structure 20 that rotatably supports an intermediate gear 22 (which corresponds to a rotating member) that transmits the rotational force of the lower shaft to the shuttle shaft will be described.
As shown in FIG. 4, the base end portion of the support shaft 21 is fixed to the machine frame F, and the intermediate gear 22 is rotatably supported by the support shaft 21. However, the intermediate gear 22 is prohibited from moving in the left-right direction by a stop ring (E-ring) 23 attached to the support shaft 21 and the machine frame F.

  In the support shaft 21, an annular grease accommodating portion 21 a having a predetermined width dimension (for example, about 5 to 10 mm) is formed in an approximately central portion in the left-right direction so as to open on a sliding surface with the intermediate gear 22. Yes.

  As shown in FIG. 4 and FIG. 5, on the left side of the grease accommodating portion 21 a in the axial direction of the support shaft 21, the first inner portion of the left gear portion 22 </ b> L of the intermediate gear 22 in contact with the support shaft 21 is first. A spiral groove 24 is formed. A second spiral groove 25 is formed on the inner peripheral portion of the right gear portion 22R of the intermediate gear 22 in contact with the support shaft 21 on the right side of the grease accommodating portion 21a in the axial direction of the support shaft 21. .

  Here, when the intermediate gear 22 rotates in a predetermined direction shown in FIG. 4 (clockwise direction when viewed from the right side), the first spiral groove 24 is a spiral that is directed toward the grease accommodating portion 21a, that is, toward the right side. (See FIG. 5). When the intermediate gear 22 rotates in a predetermined direction shown in FIG. 4, the second spiral groove 25 is a spiral (see FIG. 5) that moves toward the grease accommodating portion 21a, that is, to the left. That is, the second spiral groove 25 has a reverse spiral to the first spiral groove 24.

  Further, a first annular groove 24 a that is connected to the end of the first spiral groove 24 opposite to the grease accommodating portion 21 a, that is, the left end of the first spiral groove 24, is formed in the inner peripheral portion of the intermediate gear 22. A second annular groove 25 a that is connected to the end of the second spiral groove 25 opposite to the grease accommodating portion 21 a, that is, the right end of the second spiral groove 25, is formed in the inner peripheral portion of the intermediate gear 22.

Next, the operation and effect of the first bearing structure 15 configured as described above will be described.
When the operator periodically performs maintenance and inspection of the electronic sewing machine 1, the operator fills the grease accommodating portion 16 a of the bearing member 16 with grease G through a grease supply path (not shown) in a pressurized manner. At this time, the grease G filled in the grease accommodating portion 16a is also supplied to and filled in the first spiral groove 17 and the second spiral groove 18.

  Then, after the grease is supplied in this way, when sewing is started, the main shaft 6 is rotationally driven at a high speed in a predetermined rotational direction. At this time, the grease G supplied and held in the first and second spiral grooves 17 and 18 is diffused into the sliding portions S1 and S2 between the main shaft 6 and the bearing member 16, respectively, so that the main shaft 6 is smooth. Rotate.

  As described above, the rotation of the main shaft 6 in a predetermined direction causes the first spiral groove 17 to move the grease G toward the grease accommodating portion 16a. The wasted grease G that tends to protrude outward from the bearing member 16 through the sliding portion S1 between the member 16 is moved toward the grease accommodating portion 16a by the first spiral groove 17 and is wasted. Without being collected in the grease container 16a.

  Similarly, as described above, the rotation of the main shaft 6 in a predetermined direction causes the second spiral groove 18 to move the grease G toward the grease accommodating portion 16a. The waste grease G that tries to erode out from the bearing member 16 through the sliding portion S2 between the 6R and the bearing member 16 is moved toward the grease accommodating portion 16a by the second spiral groove 18, It is collected in the grease accommodating part 16a without being wasted.

  By the way, when the main shaft 6 rotates, the grease G supplied from the grease accommodating portion 16a protrudes outward from the bearing member 16 through the sliding portion S1 between the left shaft portion 6L of the main shaft 6 and the bearing member 16. Even in such a case, the grease G is accumulated in the first annular groove 17a connected to the first spiral groove 17, and the protrusion of the grease G to the outside is prevented. However, the grease G accumulated in the first annular groove 17a is also moved toward the grease accommodating portion 16a by the first spiral groove 17 and collected.

  Further, when the main shaft 6 rotates, the grease G supplied from the grease accommodating portion 16a protrudes outward from the bearing member 16 via the sliding portion S2 between the right shaft portion 6R of the main shaft 6 and the bearing member 16. Even in such a case, the grease G is accumulated in the second annular groove 18a connected to the second spiral groove 18, and the protrusion of the grease G to the outside is prevented. However, the grease G accumulated in the second annular groove 18a is also moved toward the grease accommodating portion 16a by the second spiral groove 18 and collected.

  As described above, in the first bearing structure 15 of the electronic sewing machine 1 that supports the main shaft 6 so as to be rotatable around the shaft center by the bearing member 16 fixed to the machine frame F, the annular grease accommodating portion formed on the bearing member 16. 16a and on the left side of the grease accommodating portion 16a in the axial direction of the main shaft 6, formed on the outer peripheral portion of the main shaft 6 in contact with the bearing member 16 and moving the grease G toward the grease accommodating portion 16a when the main shaft 6 rotates. The first spiral groove 17 to be formed and on the right side of the grease accommodating portion 16a in the axial direction of the main shaft 6 are formed on the outer peripheral portion of the main shaft 6 in contact with the bearing member 16, and the grease G is removed when the main shaft 6 rotates. Since the second spiral groove 18 that moves toward the direction 16a and the second spiral groove 18 opposite to the first spiral groove 17 is provided, the grease G supplied from the grease accommodating portion 16a The grease G supplied and held in the first and second spiral grooves 17 and 18 and supplied and held in the first and second spiral grooves 17 and 18 is placed in the sliding portions S1 and S2 between the main shaft 6 and the bearing member 16, respectively. It is diffused into a thin film, and the main shaft 6 can be rotated smoothly, improving lubricity and durability.

  Further, the first and second spiral grooves 17, 18 formed on the right side and the right side of the main shaft 6 force the grease G that tends to protrude outward from the bearing member 16 to the grease accommodating portion 16 a. The grease G can be efficiently recovered without being wasted.

  Further, a first annular groove 17a connected to the end opposite to the grease accommodating portion 16a in the first spiral groove 17 is formed in the outer peripheral portion of the main shaft 6, and opposite to the grease accommodating portion 16a in the second spiral groove 18. Since the second annular groove 18a connected to the side end portion is formed in the outer peripheral portion of the main shaft 6, the grease G supplied and held in the first spiral groove 17 moves from the first spiral groove 17 to the opposite side to the grease accommodating portion 16a. Even when trying to protrude outward from the bearing member 16, the grease G accumulates in the first annular groove 17 a connected to the first spiral groove 17, and the grease G is reliably prevented from protruding to the outside. Can be blocked.

  Further, even when the grease G supplied and held in the second spiral groove 18 moves from the second spiral groove 18 to the opposite side of the grease accommodating portion 16a and tries to erode out from the bearing member 16, the grease G Is accumulated in the second annular groove 18a connected to the second spiral groove 18, and the protrusion of the grease G to the outside can be reliably prevented.

Next, the operation and effect of the second bearing structure 20 configured as described above will be described.
When the operator periodically performs maintenance and inspection of the electronic sewing machine 1, the operator fills the grease accommodating portion 21 a of the support shaft 21 with grease G through a grease supply path (not shown) in a pressurized manner. At this time, the grease G in the grease accommodating portion 21 a is supplied to the first spiral groove 24 and the second spiral groove 25.

  Then, after the grease supply is performed in this way, when sewing is started, the intermediate gear 22 is rotationally driven at a high speed in a predetermined rotation direction. At this time, the grease G supplied and held in the first and second spiral grooves 24 and 25 is diffused in a thin film shape into the sliding portions S3 and S4 between the intermediate gear 22 and the support shaft 21, respectively. Rotates smoothly.

  Further, as described above, the first spiral groove 24 is spiraled so as to move the grease G toward the grease accommodating portion 21a by the rotation of the intermediate gear 22 in a predetermined direction. The wasted grease G that is about to go out from the intermediate gear 22 through the sliding portion S3 between the left gear portion 22L and the support shaft 21 is moved toward the grease accommodating portion 21a by the first spiral groove 24. It is moved and reliably collected in the grease accommodating portion 21a without being wasted.

  Similarly, as described above, the rotation of the intermediate gear 22 in a predetermined direction causes the second spiral groove 25 to have a spiral so as to move the grease G toward the grease accommodating portion 21a. The waste grease G that tends to erode outward from the intermediate gear 22 through the sliding portion S4 between the right gear portion 22R and the support shaft 21 is moved toward the grease accommodating portion 21a by the second spiral groove 25. And is reliably collected in the grease storage portion 21a without being wasted.

  By the way, when the intermediate gear 22 rotates, the grease G supplied from the grease accommodating portion 21a erodes outward from the intermediate gear 22 via the sliding portion S3 between the left gear portion 22L of the intermediate gear 22 and the support shaft 21. Even when trying to protrude, the grease G accumulates in the first annular groove 24a connected to the first spiral groove 24, and the protrusion of the grease G to the outside is prevented. However, the grease G collected in the first annular groove 24a is also moved toward the grease accommodating portion 21a by the first spiral groove 24 and collected.

  Further, when the intermediate gear 22 is rotated, the grease G supplied from the grease accommodating portion 21a is eaten outward from the intermediate gear 22 via the sliding portion S4 between the right gear portion 22R of the intermediate gear 22 and the support shaft 21. Even when trying to protrude, the grease G is accumulated in the second annular groove 25a connected to the second spiral groove 25, and the protrusion of the grease G to the outside is prevented. However, the grease G accumulated in the second annular groove 25a is also moved toward the grease accommodating portion 21a by the second spiral groove 25 and collected.

  As described above, in the second bearing structure 20 of the electronic sewing machine 1 that rotatably supports the intermediate gear 22 by the support shaft 21 fixed to the machine frame F, the grease accommodating portion 21a formed on the support shaft 21 and the support shaft The grease G is formed on the inner peripheral portion of the intermediate gear 22 in contact with the support shaft 21 on the left side of the grease storage portion 21a in the axial direction of the shaft 21 and moves the grease G toward the grease storage portion 21a when the intermediate gear 22 rotates. On the right side of the first spiral groove 24 and the grease accommodating portion 21 a in the axial direction of the support shaft 21, the grease G is formed on the inner peripheral portion of the intermediate gear 22 in contact with the support shaft 21 and when the intermediate gear 22 rotates. Since the second spiral groove 25 to be moved toward the grease accommodating portion 21a and the second spiral groove 25 opposite to the first spiral groove 24 is provided, the grease G supplied from the grease accommodating portion 21a is The grease G supplied to and held in the first and second spiral grooves 24 and 25 and supplied and held in the first and second spiral grooves 24 and 25 is a sliding portion S3 between the intermediate gear 22 and the support shaft 21. , S4 are diffused in a thin film shape, and the intermediate gear 22 can be smoothly rotated to improve lubricity and durability.

  In addition, the grease G that is wasted out from the intermediate gear 22 through the sliding portions S3 and S4 between the left gear portion 22L and the right gear portion 22R and the intermediate gear 22 in the axial direction of the intermediate gear 22 is used. In addition, the first and second spiral grooves 24 and 25 formed in the left gear portion 22L and the right gear portion 22R of the intermediate gear 22 forcibly accommodate the grease G that is about to protrude outward from the intermediate gear 22. The grease G can be efficiently recovered without being wasted by moving toward the portion 21a.

  Further, a first annular groove 24 a that is connected to the end of the first spiral groove 24 opposite to the grease accommodating portion 21 a is formed in the inner peripheral portion of the intermediate gear 22, and the grease accommodating portion 21 a of the second spiral groove 25 is formed. Since the second annular groove 25a connected to the opposite end of the intermediate gear 22 is formed in the inner circumferential portion, the grease G supplied and held in the first spiral groove 24 is opposite to the grease accommodating portion 21a from the first spiral groove 24. The first annular groove 24a can surely prevent the movement to the side, and the grease G supplied and held in the second spiral groove 25 is opposite to the grease accommodating portion 21a from the second spiral groove 25. The second annular groove 25a can reliably prevent the movement.

Next, a modified form of the embodiment will be described.
1) The pitch, groove depth, and groove width of the first spiral groove 17 and the second spiral groove 18 formed on the outer peripheral portion of the main shaft 6 are used according to the thickness of the main shaft 6 and the average rotation speed. You may make it change suitably according to the kind of grease G. Further, the first spiral groove 17 and the second spiral groove 18 formed on the outer peripheral portion of the main shaft 6 may be constituted by a double spiral.

2) The pitch, groove depth, and groove width of the first spiral groove 24 and the second spiral groove 25 formed on the inner peripheral portion of the intermediate gear 22 are determined according to the thickness of the intermediate gear 22 and the average rotation speed. Moreover, you may make it change suitably according to the kind of grease G to be used. Further, the first spiral groove 24 and the second spiral groove 25 formed in the inner peripheral portion of the intermediate gear 22 may be configured by a double spiral.

3) First modification.
The first bearing structure 15A in which the first bearing structure 15 described above is partially changed may be used. However, members similar to those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted. That is, as shown in FIG. 6, the grease accommodating portion 6a may be provided on the main shaft 6A instead of the bearing member 16A. Also in this case, the same operation and effect as the above-described embodiment can be achieved.

4) Second modification.
A second bearing structure 20A in which the second bearing structure 20 described above is partially changed may be used. However, members similar to those in the above-described embodiment are denoted by the same reference numerals, and description thereof is omitted. That is, as shown in FIG. 7, the grease accommodating portion 22a may be provided in the intermediate gear 22A instead of the support shaft 21A. Also in this case, the same operation and effect as the above-described embodiment can be achieved.

5) In the first bearing structures 15 and 15A described above, the grease accommodating portion may be provided in both the main shaft 6 and the bearing member 16, and the first spiral groove 17 and the first spiral groove 17 are provided in both the main shaft 6 and the bearing member 16. Two spiral grooves 18 may be formed.

6) In the second bearing structure 20, 20 </ b> A described above, the grease accommodating portion may be provided in both the support shaft 21 and the intermediate gear 22, and the first spiral groove 24 is provided in both the support shaft 21 and the intermediate gear 22. And the 2nd spiral groove 25 may be formed.

7) The present invention is not limited to the embodiments described above, and those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention. The present invention includes those modifications.

It is a front view of the electronic sewing machine which concerns on the Example of this invention. It is a partial enlarged front view which shows the internal structure of a head. It is a principal part longitudinal section front view showing the 1st bearing structure. It is a principal part vertical front view which shows a 2nd bearing structure. It is the principal part longitudinal section front of an intermediate gear. FIG. 4 is a diagram corresponding to FIG. 3 according to a first modification. FIG. 5 is a diagram corresponding to FIG. 4 according to a second modification.

Explanation of symbols

1 Electronic sewing machine 6 Main shaft 6A Main shaft 15 First bearing structure 15A First bearing structure 16 Bearing member 16A Bearing member 16a Grease housing portion 17 First spiral groove 17a First annular groove 18 Second spiral groove 18a Second annular groove 20 Second Bearing structure 21 Support shaft 21A Support shaft 21a Grease accommodating portion 22 Intermediate gear 22A Intermediate gear 24 First spiral groove 24a First annular groove 25 Second spiral groove 25a Second annular groove F Machine frame (machine frame)
G Grease

Claims (4)

In the bearing structure of the sewing machine that supports the rotary shaft so as to be rotatable around the axis by a bearing member fixed to the sewing machine frame,
An annular grease accommodating portion formed on the rotating shaft or the bearing member;
A first shaft is formed on an outer peripheral portion of the rotating shaft in contact with the bearing member on one side of the grease storing portion in the axial direction of the rotating shaft, and moves the grease toward the grease storing portion when the rotating shaft rotates. Spiral groove,
A second portion formed on an outer peripheral portion of the rotating shaft in contact with the bearing member on the other side of the grease accommodating portion in the axial direction of the rotating shaft and moving the grease toward the grease accommodating portion when the rotating shaft rotates; A second spiral groove that is a spiral groove and is opposite to the first spiral groove;
Sewing machine bearing structure characterized by comprising   A first annular groove connected to an end portion on the opposite side of the grease accommodating portion of the first spiral groove is formed on an outer peripheral portion of the rotating shaft, and an end opposite to the grease accommodating portion of the second spiral groove is formed. 2. The bearing structure for a sewing machine according to claim 1, wherein a second annular groove connected to the portion is formed in an outer peripheral portion of the rotating shaft. In a sewing machine bearing structure that rotatably supports a rotating member by a support shaft fixed to the sewing machine frame,
An annular grease container formed on the rotating member or the support shaft;
On one side of the grease accommodating portion in the axial direction of the support shaft, the grease is formed on the inner peripheral portion of the rotating member in contact with the supporting shaft and moves toward the grease accommodating portion when the rotating member rotates. A first spiral groove;
On the other side of the grease accommodating portion in the axial direction of the support shaft, the grease is formed on the inner peripheral portion of the rotating member in contact with the supporting shaft and moves toward the grease accommodating portion when the rotating member rotates. A second spiral groove which is a second spiral groove opposite to the first spiral groove;
Sewing machine bearing structure characterized by comprising   A first annular groove connected to the end opposite to the grease accommodating portion of the first spiral groove is formed in an inner peripheral portion of the rotating member, and the opposite side of the grease accommodating portion of the second spiral groove is formed. The bearing structure for a sewing machine according to claim 3, wherein a second annular groove connected to the end portion is formed in an inner peripheral portion of the rotating member.

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