JP2006181249A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine capable of surely preventing the leakage of a lubricating oil in the cylinder. <P>SOLUTION: The sewing machine comprises a lubricating oil supply-retrieve means 60 having a sealing part 65, an absorbing-holding part 66 and a retrieving part 67. The lubricating oil supply-retrieve means 60 supplies a lubricating oil to a cylinder 11 and retrieves the same from its tip end outer surface 20. As a result, a lubricating oil adhering to an inside-cylinder sewing mechanism 52 is retrieved by the lubricating oil supply-retrieve means 60. Since the lubricating oil having been carried out by the inside-cylinder sewing mechanism 52 can be retrieved, it is possible to surely prevent the leakage of the lubricating oil in the cylinder 11. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sewing machine, and more particularly to a structure for preventing leakage of lubricating oil.

  FIG. 9 is a perspective view schematically showing a cylinder 1 provided in a conventional sewing machine. The sewing machine is sewed by reciprocating a needle (not shown) up and down while feeding an article to be sewn in the feeding direction by a feed dog 3 housed in the cylinder 1 and connected to a feed base 2 covered with a cylinder cover 7. Is configured to do. The feed base 2 is supported so as to be able to move in an elliptical motion within the cylinder 1. Lubricating oil is supplied to the feed base 2 so that it can be displaced smoothly.

Further, an oil leakage preventing material 5 made of felt is provided in the vicinity of the front outer surface portion 4 of the cylinder 1 so as to abut on the feed base 2 from above. The lubricating oil adhering to the feed base 2 is absorbed or scraped off by the oil leakage preventing material 5 so that the lubricating oil is prevented from leaking from the front end outer surface portion 4 of the cylinder 1.
There is no literature showing a technique for preventing leakage of lubricating oil in a cylinder.

  With the configuration in which only the oil leakage prevention material 5 as described above is provided, it is not possible to reliably prevent the lubricating oil from being carried out to the front end outer surface portion 4 of the cylinder 1 by the operation of the feed base 2. In addition, there is no configuration that can return the lubrication once transported into the cylinder 1, and therefore leakage of the lubricating oil could not be prevented. This leakage of lubricating oil may cause problems such as soiling of the sewing product. Furthermore, when the rotational speed of the lower shaft of the sewing machine is low, about 3500 rpm, the amount of leakage is small, but as the rotational speed increases, the amount of oil supplied increases to smooth the movement of each mechanism of the sewing machine. As a result, the amount of leakage increases, so that the sewn product is easily damaged.

  An object of the present invention is to provide a sewing machine that can reliably prevent leakage of lubricating oil in a cylinder.

The present invention is a sewing machine for sewing a sewing product by reciprocating a needle while feeding the sewing product,
A cylinder,
An in-cylinder sewing mechanism that is slidably accommodated in the cylinder so as to partially protrude from the outer surface of the tip of the cylinder, and that sews a workpiece in cooperation with the needle;
The sewing machine is characterized by including a lubricating oil supply and recovery means for supplying the lubricating oil into the cylinder and recovering the lubricating oil from the outer surface portion of the tip of the cylinder.

  According to the present invention, the lubricating oil supply / recovery means is provided, and by supplying the lubricating oil into the cylinder, the in-cylinder sewing mechanism that is housed in the cylinder and is provided for sewing the sewing product can be lubricated. it can. As a result, the smooth operation of the in-cylinder sewing mechanism can be realized. Further, the lubricating oil supply / recovery means recovers the lubricating oil from the outer surface portion of the tip of the cylinder. As a result, even if the lubricating oil adhering to the cylinder inner sewing mechanism is carried to the outer surface of the tip of the cylinder by the operation of the cylinder inner sewing mechanism, the lubricating oil can be recovered by the lubricating oil supply and recovery means. . Thus, since the lubricating oil carried out by the cylinder internal sewing mechanism can be collected, leakage of the lubricating oil in the cylinder can be surely prevented.

Moreover, the lubricating oil supply and recovery means of the present invention comprises:
A sealing member that is surrounded and closely adhered to the cylinder inner sewing mechanism;
A rigid holding member provided on the outer surface of the tip of the cylinder and sandwiching and holding the seal member from both sides in the direction in which the cylinder internal sewing mechanism is displaced is provided.

  According to the present invention, the sealing member that surrounds and closely adheres to the cylinder inner sewing mechanism is held and provided by the holding member provided on the outer surface portion of the front end of the cylinder. As a result, the lubricating oil adhering to the cylinder internal sewing mechanism can be scraped off by the seal member at the outer surface of the tip of the cylinder. Therefore, the lubricating oil can be prevented from being carried further outward from the outer surface portion of the cylinder by the cylinder inner sewing mechanism, and the lubricating oil can be recovered at the outer surface portion of the tip. Moreover, the seal member is held and held by the holding member from both sides in the direction in which the cylinder internal sewing mechanism is displaced. As a result, the seal member can be prevented from being displaced together with the cylinder internal sewing mechanism, and the lubricating oil adhering to the cylinder internal sewing mechanism can be reliably scraped off.

Moreover, the lubricating oil supply and recovery means of the present invention comprises:
It is characterized by having a recovery path for guiding the lubricating oil from the outer surface portion of the tip of the cylinder to the lubricating oil recovery place.

  According to the present invention, the recovery path is provided, and the lubricating oil can be guided from the outer surface portion of the tip of the cylinder to the recovery location. By providing such a recovery path, it is possible to prevent the lubricating oil on the outer surface of the cylinder from being guided to a location other than the recovery location, and to reliably recover the lubricating oil from the outer surface of the cylinder. A configuration for collecting in a place can be realized.

Moreover, the lubricating oil supply and recovery means of the present invention comprises:
It is made of a porous material that is elastically compressible, and has an oil damming member that elastically abuts against an in-cylinder sewing mechanism in the vicinity of the outer surface of the tip of the cylinder.

  According to the present invention, there is provided an oil damming member that is resiliently brought into contact with the in-cylinder sewing mechanism in the vicinity of the outer surface of the front end of the cylinder. Since the oil damming member is made of a porous material that can be elastically compressed, the oil damming member can be dammed by contacting the cylinder inner sewing mechanism without interfering with the displacement of the cylinder inner sewing mechanism. The stopped lubricating oil can be absorbed and held, and the compressed lubricating oil can be released when compressed by the in-cylinder sewing mechanism. In this way, the amount of lubricating oil carried out per unit time to the outer surface of the cylinder tip can be reduced by the cylinder internal sewing mechanism, and the absorbing power is recovered by releasing the lubricating oil, so that it is permanent. Absorption effect can be achieved.

Moreover, the lubricating oil supply and recovery means of the present invention comprises:
It is made of a material that absorbs lubricating oil by capillary action, and has an oil absorbing member that comes into contact with a cylinder internal sewing mechanism in the vicinity of the outer surface of the tip of the cylinder.

  According to the present invention, there is provided an oil absorbing member that is brought into contact with the in-cylinder sewing mechanism in the vicinity of the front outer surface portion of the cylinder. This oil absorbing member can absorb the lubricating oil by utilizing the capillary phenomenon, and can absorb the lubricating oil adhering to the in-cylinder sewing mechanism. In this way, the amount of lubricating oil carried out per unit time to the outer surface of the tip of the cylinder by the cylinder internal sewing mechanism can be reduced. Further, for example, by sucking the lubricating oil absorbed from a part of the oil absorbing member using a suction pump or the like, the lubricating oil collected on the oil absorbing member can be collected by suction using a capillary phenomenon. Become.

Moreover, the lubricating oil supply and recovery means of the present invention comprises:
A recovery path for guiding the lubricating oil from the outer surface of the cylinder tip to the lubricating oil recovery place;
And an oil collecting passage for guiding the lubricating oil in the vicinity of the outer surface of the tip of the cylinder to the recovery passage.

  According to the present invention, there is provided a recovery path for guiding the lubricating oil from the outer surface of the tip of the cylinder to the recovery place, and an oil collecting path for guiding the lubricating oil in the outer surface of the tip and its vicinity to the recovery path. . As a result, the lubricating oil in the outer peripheral surface portion and the vicinity thereof can be guided to be collected in the recovery path by the oil collection path, and can be guided to the recovery place by the recovery path. Thus, by efficiently collecting the lubricating oil in the outer peripheral surface portion of the cylinder and the vicinity thereof and guiding it to the recovery path, it is possible to easily recover the lubricating oil in the outer surface portion of the tip and the vicinity thereof. Therefore, it is possible to prevent the trouble that the lubricating oil is guided to other than the collection place, and to reliably collect the lubricating oil at the collection place.

Moreover, the lubricating oil supply and recovery means of the present invention comprises:
A sealing member that is surrounded and closely adhered to the cylinder inner sewing mechanism;
A rigid holding member that is provided on the outer surface of the front end of the cylinder and holds and holds the seal member from both sides in the direction in which the cylinder internal sewing mechanism is displaced;
The holding member is characterized in that a through hole connected to the space of the recovery path is formed so as to form a part of the oil collection path.

  According to the present invention, the seal member that surrounds and is in close contact with the cylinder inner sewing mechanism is provided on the outer surface of the tip of the cylinder. As a result, the lubricating oil adhering to the cylinder internal sewing mechanism can be scraped off by the seal member at the outer surface of the tip of the cylinder. The seal member is sandwiched and held by the holding member from both sides in the direction in which the cylinder internal sewing mechanism is displaced. This prevents the seal member from being displaced together with the cylinder internal sewing mechanism, so that the lubricating oil adhering to the cylinder internal sewing mechanism can be reliably scraped off and the lubricating oil can be reliably recovered. it can. Further, the holding member is formed with a through-hole that continues to the space of the recovery path, and the lubricating oil scraped off by the seal member can be guided to the recovery path even when the seal member is sandwiched between the holding members.

  According to the present invention, since the lubricating oil can be recovered by the lubricating oil supply and recovery means even when the lubricating oil is carried to the outer surface of the front end of the cylinder by the operation of the cylinder inner sewing mechanism, Oil leakage can be reliably prevented. Accordingly, the sewn product can be prevented from being soiled and a sewn product with high quality can be obtained.

  Further, according to the present invention, the lubricating oil adhering to the cylinder inner sewing mechanism can be scraped off by the seal member at the outer surface of the tip of the cylinder. In addition, the seal member is held by the holding member so as not to be displaced together with the cylinder internal sewing mechanism, and the lubricating oil adhering to the cylinder internal sewing mechanism can be reliably scraped off. Therefore, the lubricating oil can be reliably recovered.

  Further, according to the present invention, the recovery path is provided, and the lubricating oil on the outer surface of the tip of the cylinder is reliably recovered at the recovery place. Therefore, leakage of the lubricating oil can be reliably prevented.

  According to the invention, the oil damming member provided in contact with the in-cylinder sewing mechanism is made of a porous material that can be elastically compressed. This prevents the cylinder inner sewing mechanism from being displaced and absorbs lubricating oil by contacting the cylinder inner sewing mechanism. In addition, the amount of lubricating oil carried out per unit time can be reduced. In this way, leakage of the lubricating oil can be reliably prevented.

  Further, according to the present invention, the oil absorbing member provided in contact with the cylinder internal sewing mechanism can absorb the lubricating oil adhering to the cylinder internal sewing mechanism using the capillary phenomenon. Therefore, the amount of lubricating oil carried out per unit time to the outer surface of the tip of the cylinder by the in-cylinder sewing mechanism can be reduced.

  Moreover, according to this invention, the lubricating oil of the front-end | tip outer surface part can be guide | induced to a collection path by an oil collection path, and can be guide | induced to a collection place by a collection path. Thus, the lubricating oil at the tip outer surface can be easily collected by efficiently collecting and guiding the lubricating oil at the tip outer surface of the cylinder to the collecting path. Therefore, it is possible to prevent a problem that is introduced to a place other than the collection place and to reliably collect the collection place.

  Further, according to the present invention, by holding the sealing member by the holding member, the displacement of the sealing member can be prevented, and the lubricating oil adhering to the in-cylinder sewing mechanism can be surely scraped. Can be recovered. Furthermore, the lubricating oil scraped off by the sealing member can be guided to the recovery path through the through hole formed in the holding member.

  FIG. 1 is a cross-sectional view showing a structure in the vicinity of a cylinder 11 of a sewing machine 10 according to an embodiment of the present invention as seen from a substantially horizontal direction that is substantially perpendicular to the axis of a bed 14. FIG. 2 is a perspective view showing the sewing machine 10 in a simplified manner. FIG. 3 is a plan view showing the cylinder 11. FIG. 4 is an exploded perspective view showing the structure near the cylinder 11. The sewing machine 10 is an industrial sewing machine such as a feed-type vertical cylinder sewing machine, and is a sewing machine that is driven at a high speed with a rotational speed of a lower shaft that forms a part of a drive system of about 5000 rpm. The housing 12 of the sewing machine 10 includes a housing main body 13, a bed 14, an arm 15, and an oil pan 16. The bed 14 is generally formed in a cylindrical shape, and is provided so as to protrude substantially horizontally from the lower portion of the housing body 13. The arm 15 is provided so as to protrude from the upper part of the housing body 13 substantially in parallel with the bed 14.

  The bed 14 houses feed bases 35 and 36 on which feed dogs 26A and 26B are mounted, respectively, and a needle plate 21 is provided on the upper surface of the tip of the bed 14. A needle bar 22 and a presser bar 23 are supported at the front end of the arm 15 so as to be displaced upward and downward. A needle 24 is attached to the lower end portion of the needle bar 22, and a presser foot 25 is attached to the lower end portion of the presser bar 23. The sewing machine 10 reciprocates the needle 24 in the up and down needle driving direction B while feeding the workpiece to be sewn between the presser foot 25 and the feed dogs 26A and 26B in the feed direction A by the feed dogs 26A and 26B. The sewing machine is configured so that a sewing object can be sewn by capturing the needle thread held by the needle 24 and engaging the looper thread held by the looper with a looper (not shown) housed in the bed 14. Yes. The sewing machine 10 is further provided with an upper decoration mechanism 28 including an upper decoration looper 27, and is configured so that the upper decoration thread can be engaged with the needle thread for decoration. The feed direction A is a substantially horizontal direction and is a direction from the front end toward the rear end (sewing machine main body side) along the axis of the bed 14. The needle driving direction B is a substantially vertical direction.

  The bed 14 includes a cylinder 11, a cylinder upper cover 29A, and a cylinder front cover 29B. The cylinder 11 has a substantially U-shaped cross section perpendicular to the axis of the bed 14 and is open upward. The cylinder 11 is formed with a flange 31 projecting outward at the rear end, and is fixed to the housing body 13 by the flange 31. An end wall 33 is formed at the tip of the cylinder 11, and a notch groove 34 that penetrates in the direction along the axis of the bed 14 and opens upward is formed in the end wall 33. The cylinder upper cover 29A has a plate shape, is fixed to the upper end portion of the cylinder 11, and covers the cylinder 11 from above. The cylinder front cover 29B is substantially a bottomed cylindrical shape, is fixed to the tip of the cylinder 11, and covers the cylinder 11 from the tip side (upstream side in the feed direction A). The cylinder front cover 29B is opened upward, and the needle plate 21 is attached to the cylinder 11 so as to close the cylinder front cover 29B from above.

  The cylinder 11 accommodates a feed table, two feed tables 35 and 36, a needle receiving table 37, and a feed table arm 38 in this embodiment. Each feed base 35, 36 is a front feed base 35 and a rear feed base 36. Hereinafter, when the front feed base 35, the back feed base 36, and the needle receiving base 37 are collectively referred to, they may be referred to as mounting bases. Each of the mounting bases 35 to 37 is a long plate-like member, and is arranged so that the longitudinal direction is substantially parallel to the axis of the bed 14 and the thickness direction is substantially perpendicular to the axis of the bed 14 and is substantially horizontal. When viewed from the upstream side in the feed direction A, the front feed base 35, the rear feed base 36, and the needle receiving base 37 are provided in contact with each other in order from the left side (upper side in FIG. 3). Each of the mounting bases 35 to 37 passes through the notch groove 34 along the axis of the bed 14, and one end portions 35 a to 37 a arranged on the upstream side in the feed direction A are upstream in the feed direction A at the tip of the cylinder 11. It protrudes outward from the front-end | tip outer surface part 20 which is an end surface part toward the feed direction A upstream. A front feed dog 26A is attached to one end 35a of the front feed base 35, and a rear feed tooth 26B is attached to one end 36a of the rear feed base 36. A needle receiver 39 that guides the needle 24 in accordance with the feed of the sewing product is attached to one end 37 a of the needle receiver 37.

  Each of the mounting bases 35 to 37 is provided so as to be displaceably connected to one end portion 38a of a feed base arm 38 supported by the cylinder 11 so as to be angularly displaceable. Each of the mounting bases 35 to 37 can be displaced so as to draw an elliptical orbit C having a major axis in the direction substantially parallel to the axis of the bed 14 and a minor axis in the vertical direction.

  The other end portions 35b to 37b arranged on the downstream side in the feed direction A of each mounting base 35 to 37 are connected to a drive system structure (not shown) including a motor as a drive source and a lower shaft. The other end 38b of the feed base arm 38 protrudes from the rear end of the cylinder 11 and protrudes into the housing body 13 and is connected to the drive system structure. Accordingly, the mounting bases 35 to 37 are driven to be displaced by the drive system structure so as to draw the elliptical orbit C as described above. As the feed bases 35 and 36 are driven to be displaced in this manner, the workpiece can be fed in the feed direction A by the feed teeth 26A and 26B that are mounted.

  As described above, the cylinder 11 houses the feed mechanism 50 including the feed bases 35 and 36 and the feed base arm 38. In the present embodiment, the cylinder 11 houses a needle guide mechanism 51 including a needle receiving base 37 that operates in synchronization with the feed mechanism 50. Therefore, in the cylinder 11, an in-cylinder sewing mechanism (hereinafter sometimes referred to as a “lower mechanism”) 52 including the feeding mechanism 50 and the needle guide mechanism 51 is partially protruded from the outer end surface portion 20 of the cylinder 11. The cylinder 11 is housed so as to be displaceable. The lower mechanism 52 is a mechanism that is provided in the cylinder 11, operates in synchronization with the reciprocating movement of the needle 24, and sews the workpiece in cooperation with the needle 24.

  In order to lubricate the lower mechanism 52 accommodated in the cylinder 11, a lubricating oil supply / recovery means 60 is provided. The lubricating oil supply / recovery means 60 supplies lubricating oil from the oil supply source 73 into the cylinder 11. The lower mechanism 52 is lubricated by the lubricating oil supplied to the cylinder 11. Further, the lubricating oil supply / recovery means 60 recovers the lubricating oil supplied into the cylinder 11 to lubricate the lower mechanism 52 from the front outer surface portion 20 to the collecting place. In the present embodiment, the oil supply source is the collection place.

  The lubricating oil supply / recovery means 60 has a pump 61, and the oil supply source 73 is configured by the pump 61 and the oil pan 16. The pump 61 is provided in the housing body 13 so that a lower end portion is disposed in the oil pan 16. Lubricating oil is stored in the oil pan 16, and the pump 61 pumps up the lubricating oil stored in the oil pan 16 via the pumping pipe line 62, and lowers the lower mechanism via the supply pipe line 63. Supplied to the drive system structure that drives 52. The pump 61 is realized by a trochoid pump, for example, but may be realized by other types of pumps. Lubricating oil from the pump 61 is also supplied to a mechanism in the arm 15.

  Lubricating oil supplied to the drive system component is atomized by the operation of the drive system component, scatters in the form of a mist, and is supplied to the cylinder 11. Lubricating oil supplied in the form of a mist to the cylinder 11 adheres to the inner peripheral surface of the cylinder 11 and the lower mechanism 52. In this way, the lubricating oil is supplied to the lower mechanism 52, and the lower mechanism 52 is lubricated. The lubricating oil adhering to the inner peripheral surface of the cylinder 11 flows back to the oil pan 16 due to the gradient at the bottom of the cylinder 11 and is naturally recovered.

  The lubricating oil supply / recovery means 60 includes a seal portion 65, an absorption holding portion 66, and a recovery portion 67. The seal portion 65 is provided on the outer end surface portion 20 and is in close contact with the lower mechanism 52 to seal between the outer end surface portion 20 and the lower mechanism 52. The seal portion 65 can scrape and remove the lubricating oil adhering to the lower mechanism 52 at the tip outer surface portion 20 of the cylinder 11. The absorption holding portion 66 is provided in the vicinity of the front end outer surface portion 20 and is provided so as to contact the lower mechanism 52. The absorption holding part 66 is made of a porous material, and can absorb and remove the lubricating oil adhering to the lower mechanism 52 and hold it.

  The collection unit 67 is configured to guide the lubricating oil removed from the lower mechanism 52 by the seal unit 65 and the absorption holding unit 66 to an oil supply source 73 that is a collection place. The recovery part 67 has a recovery path 69 for guiding the lubricating oil from the front end outer surface part 20 to the oil supply source 73. The collection path 69 is realized by, for example, a metal pipe (tubular body), and is disposed and stored in the cylinder 11 so as not to interfere with the lower mechanism 52. A tube insertion hole 70 is formed in the end wall 33 of the cylinder 11 so as to be obliquely adjacent to the lower side of the notch groove 34 and penetrate substantially parallel to the axis of the bed 14. One end 69 a of the recovery path 69 is a tube. The body insertion hole 70 is inserted densely. The tube insertion hole 70 is opened at the distal end outer surface portion 20, and the collection path 69 is inserted to a position close to the opening so as not to protrude from the opening. The other end 69 b of the recovery path 69 protrudes into the housing body 13 and is connected to the pump 61. As a result, the lubricating oil can be sucked from the front outer surface portion 20 through the recovery path 69 by the power of the pump 61 and returned to the oil pan 16.

  FIG. 5 is a cross-sectional view in which the vicinity of the tip outer surface portion 20 is enlarged and viewed from the cutting plane line S5-S5 in FIG. 6 when viewed in the same direction as FIG. FIG. 6 is a cross-sectional view seen from the section line S6-S6 in FIG. FIG. 7 is a cross-sectional view seen from the section line S7-S7 in FIG. FIG. 7A shows a state where the lower mechanism 52 is at the upper limit position, and FIG. 7B shows a state where the lower mechanism 52 is at the lower limit position. The seal portion 65 includes a feed base seal, in this embodiment two feed base seals (hereinafter also referred to as “seal”) 73 and 74, and a feed base seal support (hereinafter also referred to as “support”) 75. And a feed base seal support plate (hereinafter also referred to as “support plate”) 76. The seals 73 and 74 as seal members surround the lower mechanism 52 and are in close contact with the lower mechanism 52 in the present embodiment on the mounting bases 35 to 37. A holding member 79 is configured including the support 75 and the support plate 76, and the holding member 79 is disposed on the distal end outer surface portion 20 so that the thickness direction of the support 75 and the support plate 76 matches the feeding direction. The seals 73 and 74 are sandwiched and held from both sides in the direction in which the lower mechanism 52 is displaced.

  Each of the seals 73 and 74 is a plate-like member made of an elastic material having the same configuration and containing synthetic rubber. Each of the seals 73 and 74 is formed with a substantially rectangular and identically shaped seal hole 73a and 74a penetrating in the thickness direction at a substantially central portion. The support 75 has a flat plate-like base 77 and a peripheral wall 78 projecting from the peripheral edge to the thickness one side over the entire periphery of the base 77. The base 77 is formed with a support hole 77a penetrating in the thickness direction substantially at the center. The support plate 76 has a flat plate shape, and a support plate hole 76a penetrating in the thickness direction is formed at a substantially central portion. The support 75 and the support plate 76 are made of, for example, metal and have rigidity.

  The seals 73 and 74 are arranged so that the thickness direction is substantially parallel to the feeding direction A, and the holding member 79 is arranged so that the thickness directions of the support 75 and the support plate 76 are substantially parallel to the feeding direction. . The support 75 is provided so that the peripheral wall portion 78 protrudes in the feed direction A with respect to the base portion 77, and the support plate 76 is disposed on the downstream side in the feed direction A with respect to the support 75, and the distal end portion of the peripheral wall portion 78 is In a state where it abuts on the peripheral edge of the support plate 76, it is fixed to the distal end outer surface portion 20 using, for example, a screw member 80. Each of the seals 73 and 74 is provided so as to fit into a concave space 81 surrounded by the peripheral wall portion 78 of the support 75, and is sandwiched from both sides in the thickness direction by the base portion 77 of the support 75 and the support plate 76, and is displaced in the thickness direction. Therefore, displacement in the feed direction A and the opposite direction is prevented and held. The concave space 81 is formed larger than the seals 73 and 74 in the direction perpendicular to the thickness direction of the seals 73 and 74, and the seals 73 and 74 are displaceable in the direction perpendicular to the thickness direction. is there.

  Each of the seals 73 and 74 and the holding member 79 is provided such that each of the mounting bases 35 to 37 passes through each of the seal holes 73a and 74a, the support hole 77a, and the support plate hole 76a. Each of the mounting bases 35 to 37 thus inserts the seal portion 65 at the one end 35a to 37a, and the portion through which the sealing portion 65 is inserted is a feed when the mounting bases 35 to 37 are combined into one. The cross-sectional shape perpendicular to the direction A (the direction along the axis of the bed 14) is formed to be a uniform rectangular shape in the feed direction A. The portions of the mounting bases 35 to 37 through which the seal portions 65 are inserted are slightly larger than the seal holes 73a and 74a and smaller than the support holes 77a and the support plate holes 76a. Accordingly, each of the seals 73 and 74 includes the mounting bases 35 to 37 as a lump, surrounds the mounting bases 35 to 37, and the inner periphery elastically contacts the mounting bases 35 to 37 over the entire circumference. It is in close contact, and is displaced up and down in the concave space 81 in accordance with the displacement of drawing the elliptical orbit C of each mounting base 35 to 37. The support 75 and the support plate 76 are configured so as not to interfere with the mounting bases 35 to 37 and prevent the displacement that draws the elliptical orbit C.

  As described above, the seals 73 and 74 are provided to be sandwiched by the holding member 79 from the main displacement direction in the lower mechanism 52, that is, the feed direction A and the opposite direction, and are provided in close contact with the lower mechanism 52. By providing such a seal portion 65 including the respective seals 73 and 74, the gap between the tip outer surface portion 20 and the lower mechanism 52 is sealed, and the lubricant oil that adheres to the lower mechanism 52 at the tip outer surface portion 20, Specifically, the lubricating oil adhering to each of the mounting bases 35 to 37 can be scraped off and removed at the front end outer surface portion 20.

  The seal portion 65 is provided so as to cover the tubular body insertion hole 70 into which the collection path 69 is inserted from the downstream side in the feed direction A. Further, the support plate 76 is formed with a through hole 84 connected to the lower end region of the recessed space 81 so as to penetrate the tube insertion hole 70 in the thickness direction. Further, the lower portion 86 of the peripheral wall portion 78 of the support 75 is formed with a gradient so as to be inclined downward as approaching the through hole 84. With such a configuration, the lubricating oil scraped off from the mounting bases 35 to 37 into the recessed space 81 by the seals 73 and 74 is collected in the recovery path 69 through the recessed space 81, the through hole 84 and the tube insertion hole 70. Can lead. In the cylinder 11, a concave groove 88 that connects the notch groove 34 and the tube insertion hole 70 is formed in the tip outer surface portion 20. As a result, the lubricating oil present in the notch groove 34 by being scraped into the notch groove 34 by the seals 73 and 74 is collected and guided to the recovery path 69 via the concave groove 88 and the tube insertion groove 70. it can. Accordingly, the oil collecting passage 89 is configured including the portion defining the concave space 81 and the through hole 84 of the holding member 79 and the portion defining the tube insertion hole 70 and the concave groove 88 of the cylinder 11. Further, the lubricating oil in the tip outer surface portion 20, specifically, the lubricant present in the tip outer surface portion 20 and the vicinity thereof can be guided to the recovery path 69.

  The absorption holding unit 66 includes an upper absorbent material 90 that is an oil damming member and a lower absorbent material 91 that is an oil absorption member. The upper absorbent material 90 is made of a porous material that can be elastically compressed, and elastically contacts the lower mechanism 52 in the vicinity of the outer surface portion 20 at the front end. The upper absorbent member 90 is made of, for example, a sponge, and is easily compressed to a thickness of 1/2 or less, specifically about 1/3 or less by a driving force applied to each mounting base 35 to 37 from a driving source. It has high compressibility. The lower absorbent material 91 is made of a material that absorbs lubricating oil by capillary action, and is in contact with the lower mechanism 52 in the vicinity of the front outer surface portion 20. This lower absorbent material 91 is made of, for example, felt, and the thickness dimension can hardly be changed by the driving force applied from the driving source to each of the mounting bases 35 to 37, and the compressibility is low. Hereinafter, the upper absorbent material 90 and the lower absorbent material 91 may be collectively referred to as the absorbent materials 90 and 91.

  The upper absorbent material 90 is formed in, for example, a quadrangular prism shape. The lower absorbent material 91 has a bottom portion 92 and side portions 93 and 94 that rise from both ends of the bottom portion 91, and is generally formed in a U shape. The absorbent members 90 and 91 are arranged and provided in a square frame shape so that the upper ends of the side portions 93 and 94 of the lower absorbent member 91 are connected by the upper absorbent member 90. The absorbent members 90 and 91 are provided by being fitted into the notch grooves 34 that are closed from above by the needle plate 21. More specifically, it is provided so as to fill a square frame-shaped gap formed between the cylinder 11 and the needle plate 21 and the mounting bases 35 to 37. The upper absorbent material 90 is provided so as to cover the mounting tables 35 to 37 from above. The lower absorbent material 91 is provided so as to be covered from the lower side by the bottom portion 92 and from the lateral side by the side portions 93 and 94.

  As shown in FIG. 7 (2), the absorbent members 90 and 91 are arranged between the cylinder 11 and the needle plate 21 and the mounting bases 35 to 37 in a state where the mounting bases 35 to 37 are disposed at the lower limit position. It is formed in a size that fills a gap in a square frame shape formed between them. Since the lower absorbent material 91 has low compressibility, in order to achieve a smooth operation of the lower mechanism 52, each mounting base at the lower limit position is based on the state where each mounting base 35-37 is at the lower limit position. 35 to 37 are provided so as to come into contact with the lower side and the lateral side in an uncompressed state or a state where it is hardly compressed. Since the upper absorbent member 90 has a high compressibility, the upper absorbent member 90 is slightly compressed by the mounting bases 35 to 37 at the lower limit position with reference to the state where the mounting bases 35 to 37 are at the lower limit position. In a state where the mounting bases 35 to 37 are provided so as to be resiliently abutted from above, the smooth operation of the lower mechanism 52 is not hindered in any state between the upper limit position and the lower limit position. , Elastically abuts on each mounting base 35-37. As shown in FIG. 7 (1), in the state where the mounting bases 35 to 37 are arranged at the upper limit position, the upper absorbent material 90 from the upper side is placed on the mounting bases 35 to 37 from the state of FIG. 7 (2). Are also in a compressed state, and the side portions 93 and 94 of the lower absorbent material 91 are in contact from the lateral side, but the mounting bases 35 to 37 and the bottom portion 92 of the lower absorbent material 91 are The gap X is opened.

  By providing such an absorption holding part 66, the lubricating oil adhering to each mounting base 35-37 can be dammed near the front end outer surface part 20, absorbed and held. Specifically, the side portions 93 and 94 of the lower absorbent material 91 are always in contact with the mounting bases 35 to 37, and in detail, one side portion 93 is in contact with the forward feed base 35 and the other side The side portions 94 are in contact with the needle receiving base 37, and the lubricating oil is constantly absorbed from the mounting bases 35 to 37 by the side portions 93 and 94. When the bottom 92 of the lower absorbent material 91 is at the lower limit position, it contacts the mounting tables 35 to 37 from the lower side to absorb the lubricating oil. The upper absorbent material 90 absorbs the lubricating oil from each of the mounting bases 35 to 37 when the mounting bases 35 to 37 are displaced from the upper limit position to the lower limit position, and each of the mounting bases 35 to 37 has a lower limit. When displaced from the position to the upper limit position, the compressed and absorbed lubricating oil is released. Thus, the lubricating oil squeezed from the upper absorbent material 90 is absorbed by the side portions 93 and 94 of the lower absorbent material 91.

  The lower absorbent material 91 is provided in the vicinity of the concave groove 88 of the tip outer surface portion 20, and the suction force from the pump 61 is applied to the lower absorbent material 91 via the recovery path 69 and the concave groove 88. Communicated. As a result, the lubricating oil absorbed and held in the lower absorbent material 91 is sucked out as indicated by an arrow D from the portion close to the concave groove 88 by the suction force of the pump 61 and recovered through the recovery path 69. Lubricating oil retained in the remaining portion of the lower absorbent material 91 excluding the portion close to the concave groove 88 moves to the portion close to the concave groove 88 by capillary action, and is sucked out and collected. In this way, the lubricating oil can be recovered efficiently. Providing such an absorption holding portion 66 makes it difficult for the lubricating oil to reach the seal portion 65, reducing the load on the seal portion 65, and ensuring sealing.

  According to the sewing machine 10 of the present embodiment, the lubricating oil supply / recovery means 60 is provided. By supplying the lubricating oil into the cylinder 11, the sewing machine 10 is stored in the cylinder 11 and is provided to sew the workpiece. The mechanism 52 is lubricated, and the smooth operation of the lower mechanism 52 can be realized. Further, the lubricating oil supply / recovery means 60 can recover the lubricating oil from the tip outer surface portion 20, and the lubricating oil adhering to the lower mechanism 52 is carried out to the tip outer surface portion 20 by the operation of the lower mechanism 52. Even so, the lubricating oil can be recovered by the lubricating oil supply and recovery means 60. Therefore, leakage of the lubricating oil in the cylinder 11 can be surely prevented, contamination can be prevented, and a high-quality sewing product can be obtained.

  Further, a recovery path 69 is provided, and the lubricating oil can be guided from the tip outer surface portion 20 to an oil supply source 73 that is a recovery place. By providing such a collection path 69, it is possible to prevent problems such as the lubricating oil of the tip outer surface portion 20 being guided to a location other than the collection location, and to reliably collect the lubricating oil from the tip outer surface portion 20. It is possible to realize a configuration for collecting the water. Moreover, since the pump 61 forcibly sucks and collects it through the collection path 69, the lubricant is reliably collected without causing the lubricant to flow backward due to factors such as vibration.

  Further, a seal portion 65 is provided, and the lubricating oil adhering to the mounting mechanisms 35 to 37 in the lower mechanism 52 can be scraped off by the seals 73 and 74 at the tip outer surface portion 20. Therefore, it is possible to prevent the lubricating oil from being conveyed further outward from the front end outer surface portion 20 by the lower mechanism 52, and to collect the lubricating oil at the front end outer surface portion 20. Moreover, the seals 73 and 74 are held and held by the holding member 79 from both sides in the direction in which the mounting bases 35 to 37 are displaced, specifically from both sides in the main displacement direction (feeding direction A and the opposite direction). Has been. As a result, the seals 73 and 74 are prevented from being displaced together with the mounting bases 35 to 37 so as to be in close contact with the mounting bases 35 to 37 with high reliability, and the lubricating oil is reliably scraped off. Can do. Therefore, the lubricating oil can be reliably recovered at the tip outer surface portion 20.

  Further, an upper absorbent material 90 that is an oil damming member is provided, and a lower absorbent material 91 that is an oil absorbing member is provided. The upper absorbent member 90 is capable of blocking the lubricating oil without disturbing the displacement of the lower mechanism 52 and always abutting against the lower mechanism 52, specifically, the mounting bases 35 to 37. Can be absorbed and held. When further compressed by the lower mechanism 52, the retained lubricating oil is released. The lower absorbent material 91 absorbs the lubricating oil from each of the mounting bases 35 to 37 and also releases the lubricating oil from the upper absorbent body 90 when the lower mechanism 52 abuts against each of the mounting bases 35 to 37. Can be absorbed. By providing each of the absorbers 90 and 91 as described above, the lubricating oil can be dammed and absorbed before each of the seals 73 and 74. Therefore, the burden on each of the seals 73 and 74 is reduced, and the lubricating oil is reduced. Can be surely prevented. Lubricating oil retained by the absorbents 90 and 91 can be sucked and collected using the suction force of the pump 61.

  Further, the oil collecting passage 89 is formed as described above, and the lubricating oil scraped off by the seals 73 and 74 and the lubricating oil in the outer peripheral surface portion 20 and the vicinity thereof are collected by the oil collecting passage 89. It can guide to 69 and can guide to a collection place by collection path 69. Thus, the lubricating oil in the tip outer surface portion 20 and the vicinity thereof can be efficiently collected and guided to the recovery path 69, and the lubricating oil in the tip outer surface portion 20 and the vicinity thereof can be easily collected. Therefore, it is possible to prevent the trouble that the lubricating oil is guided to other than the collection place, and to reliably collect the lubricating oil at the collection place.

  FIG. 8 is a cross-sectional view showing a seal portion 65 according to another embodiment of the present invention. Components corresponding to those in the embodiment of FIGS. 1 to 7 are denoted by the same reference numerals, and only different components will be described. In the embodiment shown in FIGS. 1 to 7, as shown in FIG. 6, the lower portion 86 of the peripheral wall portion 78 of the support 75 is formed to be inclined. However, in the embodiment shown in FIG. It is formed substantially horizontally. Such a structure may be sufficient and it can collect and collect | recover lubricating oil similarly.

  Each above-mentioned embodiment is only the illustration of this invention, and can change a structure. For example, the lower mechanism is not limited to the above-described configuration, and the number of feed bases may be one or three or more. Further, the needle cradle is not an essential component and may not be provided. Moreover, the structure provided with respect to the mechanism for driving the looper which captures a needle thread | yarn may be sufficient as a seal | sticker part and an absorption holding | maintenance part. Further, the suction recovery by the pump 61 is not essential, and a configuration may be used in which the recovery path 69 is caused to flow down by gravity using a gradient and recovered. The collection path 69 may be realized by forming a groove instead of a pipe, or may be configured to be provided outside the cylinder 11. Further, only one seal or three or more seals may be provided. Other various modifications may be made within the scope of the present invention.

2 is a cross-sectional view showing a structure near a cylinder 11 of a sewing machine 10 according to an embodiment of the present invention when viewed from a substantially horizontal direction that is substantially perpendicular to the axis of a bed 14. FIG. 1 is a perspective view showing a sewing machine 10 in a simplified manner. 2 is a plan view showing a cylinder 11. FIG. 2 is an exploded perspective view showing a structure in the vicinity of a cylinder 11. FIG. FIG. 7 is a cross-sectional view showing the vicinity of the tip outer surface portion 20 as viewed in the same direction as in FIG. 1 and viewed from the section line S5-S5 in FIG. FIG. 6 is a cross-sectional view seen from a section line S6-S6 in FIG. FIG. 6 is a cross-sectional view seen from a section line S7-S7 in FIG. It is sectional drawing which shows the seal part 65 of the other form of implementation of this invention. It is a perspective view which simplifies and shows the cylinder 1 provided in the sewing machine of a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Sewing machine 11 Cylinder 14 Bed 16 Oil pan 20 Front end outer surface part 35,36 Feed stand 37 Needle receiving stand 52 Cylinder inner sewing mechanism (lower mechanism)
60 Lubricating oil supply and recovery means 61 Pump 65 Sealing part 66 Absorption holding part 67 Recovery part 69 Recovery path 70 Tube insertion hole 73, 74 Feeding base seal 75 Feeding base seal support 76 Feeding base seal support plate 84 Through hole 88 Concave groove 89 Oil collecting passage 90 Upper absorbent material 91 Lower absorbent material

Claims (7)

A sewing machine that sews a workpiece by reciprocating a needle while feeding the workpiece,
A cylinder,
An in-cylinder sewing mechanism that is slidably accommodated in the cylinder so as to partially protrude from the outer surface of the tip of the cylinder, and that sews a workpiece in cooperation with the needle;
A sewing machine comprising: lubricating oil supply means for collecting lubricating oil into the cylinder and collecting the lubricating oil from the outer surface of the tip of the cylinder. Lubricating oil supply and recovery means
A sealing member that is surrounded and closely adhered to the cylinder inner sewing mechanism;
2. The sewing machine according to claim 1, further comprising: a rigid holding member that is provided on an outer surface portion of a tip of the cylinder and holds the seal member from both sides in a direction in which the cylinder internal sewing mechanism is displaced. Lubricating oil supply and recovery means
3. The sewing machine according to claim 1, further comprising a recovery path for guiding the lubricating oil from the outer surface portion of the front end of the cylinder to a lubricating oil recovery place. Lubricating oil supply and recovery means
4. An oil damming member made of a porous material that is elastically compressible and elastically abutting against an in-cylinder sewing mechanism in the vicinity of the outer surface of the tip of the cylinder. The sewing machine according to any one of the above. Lubricating oil supply and recovery means
5. The oil absorbing member according to claim 1, further comprising an oil absorbing member made of a material that absorbs lubricating oil by capillary action and abutted against a cylinder inner sewing mechanism in the vicinity of the outer surface portion of the tip of the cylinder. The described sewing machine. Lubricating oil supply and recovery means
A recovery path for guiding the lubricating oil from the outer surface of the cylinder tip to the lubricating oil recovery place;
The sewing machine according to any one of claims 1 to 5, further comprising an oil collecting passage for guiding the lubricating oil in the vicinity of the outer peripheral surface portion of the cylinder and the vicinity thereof to the recovery passage. Lubricating oil supply and recovery means
A sealing member that is surrounded and closely adhered to the cylinder inner sewing mechanism;
A rigid holding member that is provided on the outer surface of the front end of the cylinder and holds and holds the seal member from both sides in the direction in which the cylinder internal sewing mechanism is displaced;
The sewing machine according to claim 6, wherein the holding member is formed with a through hole connected to the space of the recovery path so as to form a part of the oil collection path.

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