JP4395405B2 - Tube-type lockstitch machine - Google Patents

Description

  The present invention relates to a tubular main sewing machine.

  As shown in FIG. 7, the conventional cylindrically-stitched sewing machine sews a cylindrical sewing product such as a trouser hem, so that the size around the sewing machine hook 201 is reduced to a small diameter. A cloth feed roller 203 for feeding the cloth C is provided in the vicinity of the sewing machine hook 201. The cloth feed roller 203 is rotated according to the sewing of the sewing machine by a drive mechanism (not shown), and feeds the cloth C in the A direction according to the sewing. A needle plate 204 is provided above the sewing machine hook 201, and a knife unit 205 is provided between the sewing machine hook 201 and the needle plate 204 when it has a thread trimming function. The knife unit 205 is fixed to a part of the sewing machine frame 202 or fixed to the back surface of the needle plate 204, and operates according to sewing of the sewing machine by a driving mechanism (not shown) so that the thread is cut when the sewing is completed. It has become. Further, a lid 210 that shields each part of the sewing machine hook 201 and the like from the outside is provided at the front end of the sewing machine frame 202 so as to be freely opened and closed. The sewing machine hook 201 is rotated and sewed in synchronization with a driving mechanism, a needle bar, a balance, etc. (not shown). The sewing machine hook 201 is supplied with lubricating oil through an oil supply mechanism (not shown) in order to improve durability and sewing performance of the sewing machine hook 201 (see, for example, Patent Document 1 and Patent Document 2). ).

Here, out of the lubricating oil 206 supplied to the sewing machine hook 201, excess lubricating oil 206 is scattered from the outer periphery of the sewing machine hook 201 around the sewing machine hook 201 due to the centrifugal force generated by the rotation of the sewing machine hook 201. Due to the scattering of the lubricating oil 206, the lubricating oil 206 attached to the inner wall of the sewing machine frame 202 slides down along the inner wall and accumulates in a recess 207 formed on the bottom surface of the sewing machine frame 202. Further, the lubricating oil 206 splashed upward from the sewing machine hook 201 adheres to the bottom surface of the knife unit 205, drops from the knife unit 205 onto the inner wall of the sewing machine frame 202, and accumulates in the recess 207. Further, the lubricating oil (particularly in the form of mist) that has passed through the gap of the knife unit 205 adheres to the back surface of the needle plate 204, drops on the inner wall of the sewing machine frame 202, and accumulates in the recess 207. The lubricating oil 206 accumulated in the recess 207 is sucked into the oil core 208 and returned to the oil supply mechanism through the pipe 209. On the other hand, the lubricating oil 206 scattered from the sewing machine hook 201 toward the cloth feeding roller 203 adheres to the cloth feeding roller 203, and the cloth feeding roller 203 rotates with the lubricating oil 206 attached thereto.
JP 2002-143592 A JP 2003-144788 A

However, in the conventional cylinder type main sewing machine, since the lubricating oil adhering to the back surface of the needle plate oozes out from the surface of the needle plate attached to the sewing machine frame, the sewing product may be soiled with the lubricating oil. Further, when the lubricating oil adheres to the cloth feed roller, the sewing product may be soiled with the lubricating oil when the cloth is fed.
In addition, the lubricating oil adhering to the back surface of the female unit may be dripped onto the lid side at the tip of the sewing machine frame due to wind pressure generated by the rotation of the sewing machine during sewing. Even in this case, the lubricating oil accumulates in the recess formed on the inner wall of the sewing machine frame. Before being sucked into the core, it moved to the lid side by the wind pressure of the sewing machine and leaked from the lower part of the lid to the outside of the sewing machine frame, and the sewing product was sometimes soiled with lubricating oil.

  SUMMARY OF THE INVENTION An object of the present invention is to provide a cylindrical type main sewing machine capable of preventing a sewing product from being soiled with lubricating oil during sewing.

In order to solve the above-described problems, the invention according to claim 1 has a cylindrical shape with an open front end, a sewing machine bed is formed above, and a hook chamber is formed at the tip, and the bottom of the pot chamber A cylinder portion provided with a reflux mechanism, a sewing machine hook fixed in the hook chamber and driven by rotation of the hook shaft, an oil supply means for supplying lubricating oil from the hook shaft to the outer hook, A needle plate fixed to the upper notch, and a cloth feed roller which is disposed adjacent to the needle plate in the shuttle chamber and conveys the sewing product on the needle plate in synchronization with the driving of the sewing machine hook; In this case, the recirculation mechanism includes a felt provided so as to be immersed in lubricating oil stored in a bottom portion of the shuttle chamber behind a bottom portion of the center hook of the sewing machine hook, Suction of the lubricating oil contained in the felt and return it to the oil supply means When, and a suction pump connected to the suction tube, the distal end direction of at least the cylinder unit from the loop-taker point of the sewing machine hook, toward the proximal direction of the cylinder portion from the bottom of the kettle in the sewing machine hook, from the needle plate A shielding body that shields the lubricating oil scattered from the sewing machine hook is installed between the cloth feeding roller and the sewing machine hook, and the lower end edge of the shielding body along the cloth feeding roller is connected to the cylinder portion. Inclined downward from the front end direction to the rear, and a convex portion protruding rearward from the lower end edge is formed above the felt behind the bottom of the middle hook of the sewing machine .

According to the first aspect of the present invention, when the lubricating oil is supplied to the outer hook by the oil supply means, the excess lubricating oil is scattered toward the lower surface of the needle plate and the cloth feed roller. Here, the shield is at least between the tip of the cylinder part from the sword tip of the sewing machine hook to the base end of the cylinder part from the bottom part of the middle hook of the sewing machine, between the needle plate and the cloth feed roller and the sewing machine hook. Since the lubricating oil scattered from the sewing machine hook is shielded, the lubricating oil scattered from the sewing machine hook adheres to the shield.
Thereby, the scattered lubricating oil does not ooze out from the surface of the needle plate attached to the sewing machine frame or adhere to the cloth feed roller. Accordingly, it is possible to prevent the sewing product from being soiled with the lubricating oil during the sewing.
The lubricating oil splashed from the sewing machine hook adheres to the shield and flows downward through the shield, but the lower edge on the side along the cloth feed roller is inclined downward from the tip of the cylinder portion to the rear. Therefore, the lubricating oil that has flowed to the lower end edge of the shield is dropped after flowing from the front end direction of the cylinder portion toward the rear before dropping to the bottom portion of the cylinder portion.
As a result, even if the lubricating oil scatters to the front end side of the cylinder portion, it will drip behind the cylinder portion, so that the lubricating oil that has dropped and collected at the bottom of the cylinder portion receives the wind pressure due to the rotation of the sewing machine hook. It is less likely to flow to the tip side of the cylinder part and prevents leakage from the cylinder part to the outside. Accordingly, it is possible to prevent the sewing product from being soiled with the lubricating oil during the sewing.
Moreover, since lubricating oil flows into the convex part which protrudes below a lower end edge, it is dripped from the convex part to the bottom part of a cylinder part.
As a result, the lubricating oil adhering to the shield can be dropped after being collected on the convex portion, and the lubricating oil can be dropped below the convex portion. Less susceptible to wind pressure. Therefore, the lubricating oil dropped on the bottom of the cylinder part is less likely to flow to the tip side of the cylinder part due to the wind pressure generated by the rotation of the sewing machine hook, and is prevented from leaking outside from the cylinder part. Accordingly, it is possible to prevent the sewing product from being soiled with the lubricating oil during the sewing.

According to a second aspect of the invention, the cylindrical lockstitch sewing machine according to claim 1, of the shield, characterized in that the lower portion of the side along the cloth feed roller and the vertical plane.

According to the second aspect of the present invention, since the lower part of the shielding body along the cloth feed roller is a vertical surface, the lubricating oil adhering to the shielding body can be easily dropped onto the bottom of the cylinder part. it can.

According to a third aspect of the present invention, in the cylindrical type lockstitch sewing machine according to the first or second aspect , one end of the shielding body is closer to a base end side of the cylinder portion than a bottom portion of the sewing machine hook. An oil core member is provided in contact with the other end and in contact with the reflux mechanism.

According to the third aspect of the present invention, since the shield and the reflux mechanism are connected by the oil core member, when the lubricating oil scattered from the sewing machine hook adheres to the shield, the attached lubricating oil It is absorbed by the core member and guided to the reflux mechanism.
As a result, the amount of lubricating oil dripping from the shield to the bottom of the cylinder portion can be reduced, so that the amount of lubricating oil that flows to the tip side of the cylinder portion due to wind pressure due to the rotation of the sewing machine can be further reduced. It is possible to prevent the lubricating oil from leaking outside from the cylinder portion. Accordingly, it is possible to prevent the sewing product from being soiled with the lubricating oil during the sewing.

According to a fourth aspect of the present invention, in the cylindrical lockstitch sewing machine according to any one of the first to third aspects, the lubricating oil is absorbed between an upper surface of the shield and a lower surface of the needle plate. It is characterized by being filled with a lubricating oil absorber.

According to the fourth aspect of the present invention, the path through which the lubricant is scattered from the upper surface of the shield toward the lower surface of the needle plate is blocked by the lubricant absorber.
As a result, even if the lubricating oil scatters from the upper surface of the shield toward the lower surface of the needle plate, the lubricating oil is absorbed by the lubricating oil absorber before reaching the lower surface of the needle plate. It does not adhere to the bottom surface. Therefore, the scattered lubricating oil does not ooze out from the surface of the needle plate attached to the sewing machine frame, and the sewn product can be prevented from being stained with the lubricating oil during sewing.

According to the first aspect of the present invention, the scattered lubricating oil does not adhere to the lower surface of the throat plate or the cloth feed roller, and oozes out from the surface of the throat plate attached to the sewing machine frame or adheres to the cloth feed roller. There is nothing to do. Accordingly, it is possible to prevent the sewing product from being soiled with the lubricating oil during the sewing.
Also, even if the lubricating oil scatters to the front end side of the cylinder part, it will drop at the rear of the cylinder part, so the lubricating oil that has dropped and collected at the bottom of the cylinder part receives wind pressure from the rotation of the sewing machine and receives the cylinder pressure. This prevents the fluid from flowing to the tip side of the part and prevents the cylinder part from leaking outside. Accordingly, it is possible to prevent the sewing product from being soiled with the lubricating oil during the sewing.
In addition, the lubricating oil adhering to the shield can be dropped after being collected on the convex part, and the lubricating oil can be dropped below the convex part. It is hard to be affected by. Therefore, the lubricating oil dropped on the bottom of the cylinder part is less likely to flow to the tip side of the cylinder part due to the wind pressure generated by the rotation of the sewing machine hook, and is prevented from leaking outside from the cylinder part. Accordingly, it is possible to prevent the sewing product from being soiled with the lubricating oil during the sewing.

According to the second aspect of the present invention, since the lower part of the shielding body along the cloth feed roller is a vertical surface, the lubricating oil adhering to the shielding body can be easily dropped onto the bottom of the cylinder part. it can.

According to the third aspect of the present invention, since the amount of lubricating oil dripping from the shield onto the bottom of the cylinder portion can be reduced, the lubrication that is caused to flow by the wind pressure due to the rotation of the sewing machine to the tip side of the cylinder portion The amount of oil can be further reduced, and the lubricating oil is prevented from leaking out of the cylinder portion. Accordingly, it is possible to prevent the sewing product from being soiled with the lubricating oil during the sewing.

According to the fourth aspect of the present invention, even if the lubricating oil scatters from the upper surface of the shield toward the lower surface of the needle plate, the lubricating oil is absorbed by the lubricating oil absorber before reaching the lower surface of the needle plate. Therefore, the lubricating oil does not adhere to the lower surface of the needle plate. Therefore, the scattered lubricating oil does not ooze out from the surface of the needle plate attached to the sewing machine frame, and the sewn product can be prevented from being stained with the lubricating oil during sewing.

  DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the best mode of a tubular book stitch sewing machine according to the present invention will be described in detail with reference to the drawings. Here, the cylindrical main sewing machine is a sewing machine used when sewing a cylindrical sewing product such as a trouser hem.

FIG. 1 is a perspective view of the vicinity of a sewing machine hook of a cylindrical lock stitch machine 100 (hereinafter referred to as the sewing machine 100), and FIG. 2 is a front view and a (b) side view of the vicinity of the sewing machine hook.
As shown in FIGS. 1 and 2, the sewing machine 100 includes a cylinder portion 1 that is formed in a cylindrical shape so as to pass a hem when sewing the hem of a pants, and a sewing machine that is provided above the cylinder portion 1. A sewing machine 3 having a bed (not shown) and a bobbin around which a lower thread is wound and passing the lower thread through a loop of the upper thread by rotation, and oil supply as an oil supply means for supplying lubricating oil LO to the sewing machine hook 3 The device 4, the needle plate 5 fixed to the upper notch portion of the cylinder portion 1, and the needle plate 5 are arranged adjacent to the needle plate 5, and the sewing product N on the needle plate 5 is synchronized with the driving of the sewing machine hook 3. A cloth feed roller 6 to be conveyed, a shield 7 that shields the lubricating oil LO scattered from the sewing machine 3, and a knife unit 8 that operates in accordance with sewing and cuts the thread after sewing is provided.

The cylinder part 1 is formed in a cylindrical shape with an open end, and constitutes a part of the sewing machine frame. A lid 11 that can be opened and closed by a hinge or the like is provided at the tip of the cylinder portion 1. A hook chamber 12 in which a sewing machine hook 3 is provided is formed at the tip of the cylinder portion 1. A hook shaft 13 extending from the base end portion of the cylinder portion 1 toward the tip end portion is provided in the hook chamber 12. The shuttle shaft 13 is connected to a drive motor (not shown) so as to be rotatable around the shaft, and the sewing machine shuttle 3 is attached to the distal end portion of the shuttle shaft 13.
Further, a storage groove 14 for storing the lubricating oil LO is formed in the bottom portion of the cylinder portion 1 from the front end portion to the base end portion, and an attachment for attaching the shield 7 above the inner wall of the cylinder portion 1. A portion 15 is formed. An insertion hole 16 into which a part of the shield 7 is inserted is formed in the inner wall of the cylinder portion 1.
A lubricating oil recirculation device 17 as a recirculation mechanism connected to the storage groove 14 is provided at the bottom of the cylinder portion 1 on the base end side. The lubricating oil recirculation device 17 sucks a felt 171 provided so as to be partially immersed in the lubricating oil LO stored in the storage groove 14, and the lubricating oil LO contained in the felt 171 to suck the lubricating oil LO. And a suction pump (not shown) connected to the suction pipe 172. The lubricating oil LO sucked from the storage groove 14 by the lubricating oil recirculation device 17 is returned to the oil supply device 4.

The sewing machine hook 3 is provided with an outer hook 31 and an inner hook 32. The outer hook 31 is formed with a sword tip 31a for hooking a loop of an upper thread.
The oil supply device 4 includes a spiral groove 41 formed in the shuttle shaft 13 and an oil hole 42 connected to the spiral groove 41. Then, by opening the valve of the oil supply pipe provided behind the spiral groove 41, the lubricating oil LO flows into the spiral groove 41, and the centrifugal force generated by the rotation of the hook shaft 13 causes the tip of the oil hole 42 to move. It is poured into the sliding part of the outer pot 31 and the inner pot 32.
The needle plate 5 is for placing the sewing product N at the time of sewing, and is provided above the sewing machine hook 3. The needle plate 5 is formed with a needle hole, and sewing is performed by reciprocating the sewing needle while passing in the vertical direction through the needle hole.
The cloth feed roller 6 is provided above one side wall of the cylinder portion 1 and conveys the sewing product N on the needle plate 5 by rotating. A part of the cloth feed roller 6 is installed so as to be exposed in the cylinder portion 1.

  The shield 7 is provided at a position so as to cover the upper portion of the sewing machine hook 3, and more specifically, at least from the tip of the cylinder part 1 from the tip 31 a of the sewing machine hook 3 and from the bottom 32 a of the intermediate hook 32 of the sewing machine hook 3. It is provided between the cloth feed roller 6 and the sewing machine hook 3 from the needle plate 5 toward the proximal end of the cylinder portion 1. By providing the shield 7 at this position, it is possible to prevent the lubricating oil LO scattered from the sewing machine hook 3 from adhering to the back surface of the needle plate 5 and the cloth feed roller 6.

  As shown in FIGS. 3 and 4, the shield 7 is formed from a metal plate. The shield 7 is formed with a fixing portion 71 that is attached to the attachment portion 15 and fixed to the cylinder portion 1. The fixing portion 71 is formed with an attachment hole 71a through which an attachment for attaching the shield 7 is inserted. In the fixing portion 71, a needle plate shielding portion 72 that is raised and bent upward from the fixing portion 71 and has a surface parallel to the surface direction of the upper surface of the fixing portion 71 is connected to the fixing portion 71. Is formed. Here, the needle plate shielding portion 72 is provided so as to be positioned between the back surface of the needle plate 5 and the sewing machine hook 3, and the lubricating oil LO scattered from the sewing machine hook 3 adheres to the back surface of the needle plate 5. To prevent. In the throat plate shielding part 72, an inclined part 73 formed so as to incline downward is formed at a position facing the fixing part 71. An insertion protrusion 74 for being inserted into the insertion hole 16 of the cylinder portion 1 is formed on the lower end portion of the inclined portion 73 so as to be continuous with the inclined portion 73. Thereby, the shield 7 is fixed to the cylinder part 1 by the fixing part 71 and the insertion protrusion 74. In addition, the needle plate shielding portion 72 has a notch formed at a location that becomes a needle movement path when the needle plate shielding portion 72 is provided in the cylinder portion 1, and this notch functions as a needle drop portion 75.

In addition, the throat plate shielding portion 72 is continuously formed with a cloth feed roller shielding portion 76 that is bent from the throat plate shielding portion 72 and is curved along the cloth feed roller 6 side. The lower part of the cloth feed roller shielding part 76 is a vertical surface, and the lubricating oil adhering to the cloth feed roller shielding part 76 slides down easily.
The lower edge 76 a of the cloth feed roller shielding portion 76 is formed so as to incline downward from the front end direction of the cylinder portion 1 to the rear when the shielding body 7 is provided in the cylinder portion 1. When the lubricating oil LO adhering to the shield 7 reaches the lower end edge 76a, the inclination does not immediately drop from the lower end edge 76a to the bottom of the cylinder part 1, and the lubricating oil LO is placed behind the cylinder part 1. Is moved to the bottom of the cylinder part 1 after being moved.
Of the lower end edge 76a, the lower end edge is located behind the bottom 32a of the inner hook 32 of the sewing machine 3 when installed on the cylinder portion 1, more specifically, above the felt 171 of the lubricating oil recirculation device 17. A convex portion 77 that protrudes downward from 76a is formed. The convex portion 77 has a function of urging the dropping position of the lubricating oil LO transmitted through the lower end edge 76 a below the convex portion 77, and the felt 171 is provided below the convex portion 77. It is easy to absorb the lubricating oil LO.

  The knife unit 8 is a device that cuts a thread after sewing work, and is provided between the needle plate 5 and the shield 7.

Here, the operation when the shield 7 is provided will be described.
When the hook shaft 13 is rotated by a drive motor (not shown) provided behind the hook shaft 13, the sewing machine hook 3 provided on the hook shaft 13 also rotates together with the hook shaft 13. The rotation of the sewing machine hook 3 is performed while the outer hook 31 is in sliding contact with the inner hook 32 while the inner hook 32 is fixed. At this time, the lubricating oil LO is supplied from the oil supply device 4 to the sliding contact portion between the outer hook 31 and the inner hook 32 to suppress the generation of frictional heat at the sliding portion.
Thus, when the sewing machine hook 3 rotates, the lubricating oil LO is supplied, but a part of the lubricating oil LO is scattered around the sewing machine hook 3 by the rotation of the sewing machine hook 3. Here, the lubricating oil LO scattered below the sewing machine hook 3 accumulates in the storage groove 14, and the lubricating oil LO scattered above the sewing machine hook 3 adheres to the shield 7.

Of the shield 7, the lubricating oil LO attached to the cloth feed roller shield 76 tries to move downward due to gravity and reaches the lower end edge 76 a while moving downward on the vertical surface. Lubricating oil LO at the lower end edge 76a moves along the inclination from the front end direction of the cylinder part 1 to the rear, is located above the felt 171 of the lubricating oil recirculation device 17, and protrudes downward from the lower end edge 76a. Part 77 is reached.
Through such a process, the lubricating oil LO adhering to the shield 7 gradually gathers in the convex portion 77, and when the gravity applied to the lubricating oil LO accumulated in the convex portion 77 exceeds the surface tension of the lubricating oil LO, The lubricating oil LO drops downward toward the felt 171 and is absorbed by the felt 171.
Further, the lubricating oil LO accumulated in the storage groove 14 is also absorbed by the felt 171, and the absorbed lubricating oil LO is sucked from the suction pipe 172 and returned to the oil supply device 4.

As described above, according to the sewing machine 100 according to the present invention, when the lubricating oil LO is supplied to the outer hook 31 by the oil supply device 4, the excess lubricating oil LO is removed from the back surface of the needle plate 5 and the cloth feed roller 6. Scattered towards. Here, the shield 7 feeds the cloth from the needle plate 5 from at least the sword tip 31a of the sewing machine hook 3 toward the distal end of the cylinder part 1 to the bottom part 32a of the intermediate hook 32 of the sewing machine hook 3 toward the proximal end of the cylinder part 1. Since the lubricating oil LO scattered from the sewing machine hook 3 is shielded between the roller 6 and the sewing machine hook 3, the lubricating oil LO scattered from the sewing machine hook 3 adheres to the shield 7.
Thus, the scattered lubricating oil LO does not ooze out from the surface of the needle plate 5 attached to the sewing machine frame or adhere to the cloth feed roller 6. Therefore, it is possible to prevent the sewn product N from being stained with the lubricating oil LO during sewing.

The lubricating oil LO splashed from the sewing machine hook 3 adheres to the shield 7 and flows downward through the shield 7, but the lower edge 76 of the cloth feed roller shield 76 is rearward from the tip of the cylinder 1. Since the lubricating oil LO that has flowed to the lower end edge 76 of the cloth feed roller shielding portion 76 flows downward from the front end direction of the cylinder portion 1 before dripping into the storage groove 14. Dripping.
As a result, the scattered lubricating oil LO drops near the lubricating oil recirculation device 17, so that the lubricating oil LO that drops and accumulates in the storage groove 14 receives the wind pressure due to the rotation of the sewing machine 3 and receives the tip side of the cylinder portion 1. This prevents leakage from the cylinder portion 1 to the outside. Therefore, it is possible to prevent the sewn product N from being stained with the lubricating oil LO during sewing.
Moreover, since the lower part of the cloth feed roller shield part 76 of the shield 7 is a vertical surface, the lubricating oil LO adhering to the shield 7 can be easily dropped onto the storage groove 14.

The present invention is not limited to the above embodiment. For example, as shown in FIG. 5, the convex portion 77 and the felt 171 of the lubricating oil recirculation device 17 may be connected by an oil core member 9. Thereby, the lubricating oil LO reaches the felt 171 from the convex portion 77 through the oil core member 9 and is absorbed by the felt 171. Therefore, since the lubricating oil LO does not drop from the convex portion 77, the lubricating oil LO can be recirculated before being affected by the wind pressure due to the rotation of the sewing machine hook 3. In addition, it may replace with the oil core member 9 and may connect with a string-like felt.
Moreover, as shown in FIG. 6, the felt 10 as a lubricating oil absorber which contacts the back surface of the needle plate 5 and the female unit 8 is provided on the upper surface of the fixing portion 71 of the shield 7, and the felt 10 and the felt 171 are attached. You may connect. Thus, when the lubricating oil LO is in the form of a mist, it passes through the shield 7 and adheres to the back surface of the needle plate 5 and the female unit 8, but absorbs the lubricating oil LO adhered to the felt 10 and transmits it to the felt 171. Therefore, the lubricating oil LO is not dropped from the convex portion 77, and the lubricating oil LO can be recirculated before being affected by the wind pressure due to the rotation of the sewing machine hook 3.
Further, the shield 7 is attached to the cylinder portion 1, but may be attached to the back surface of the needle plate 5.
In addition, the present invention can be freely changed and improved without departing from the gist of the invention.

FIG. 3 is a schematic perspective view of the vicinity of the sewing machine hook in the tubular type main sewing machine according to the present invention. (A) is a schematic front view of a part of the vicinity of the sewing hook in the cylindrical type main sewing machine according to the present invention, and (b) is a part of the vicinity of the sewing hook in the cylindrical type of main sewing machine according to the present invention. It is the schematic side view seen through. It is a perspective view of the shield in the cylinder type main sewing machine concerning the present invention. It is a perspective view of the shield in the cylinder type main sewing machine concerning the present invention. FIG. 6 is a schematic side view of a part of the vicinity of a sewing machine hook in another example of a cylindrical lock stitch sewing machine according to the present invention. FIG. 6 is a schematic side view of a part of the vicinity of a sewing machine hook in another example of a cylindrical lock stitch sewing machine according to the present invention. (A) is a schematic front view of a part near the sewing machine hook in a conventional cylindrical lockstitch sewing machine, and (b) is a schematic side view of a part of the conventional cylinder lockstitch sewing machine near the sewing machine hook. FIG.

Explanation of symbols

1 Cylinder unit 3 Sewing machine 4 Lubrication device (lubricating means)
5 Needle plate 6 Cloth feed roller 7 Shield 9 Felt (oil core member)
10 Felt (lubricant absorber)
12 Pot chamber 17 Lubricating oil recirculation device 77 Convex part 100 Cylindrical lockstitch machine N Sewing product

Claims (4)

A cylinder with an open end, a sewing machine bed formed above, a hook chamber formed at the tip, and a cylinder portion provided with a reflux mechanism at the bottom of the pot chamber;
A sewing machine hook fixed in the hook chamber and driven by rotation of the hook shaft;
Oil supply means for supplying lubricating oil from the hook shaft to the outer hook;
A needle plate fixed to a cutout portion at the top of the cylinder portion;
In the cylindrical book stitch sewing machine, which is disposed adjacent to the needle plate in the shuttle chamber, and includes a cloth feed roller that conveys the sewing product on the needle plate in synchronization with the driving of the sewing machine hook,
The recirculation mechanism is configured to suck the lubricating oil contained in the felt by sucking a felt provided so as to be immersed in the lubricating oil stored in the bottom of the hook chamber behind the bottom of the middle hook of the sewing machine. A suction pipe returning to the oil supply means, and a suction pump connected to the suction pipe,
Scattering from the sewing machine shuttle between the needle plate and the cloth feed roller and the sewing machine hook, at least from the tip of the cylinder hook to the tip of the cylinder part from the bottom of the sewing machine hook to the base end of the cylinder part a shield that shields the lubricating oil to be installed,
Of the shield, a lower end edge on the side along the cloth feed roller is inclined downward from the front end direction of the cylinder portion to the rear, and is located behind the bottom of the sewing machine hook and above the felt. A cylindrical book-sewing machine characterized in that a convex part protruding downward from the lower edge is formed . In the cylinder type main sewing machine according to claim 1 ,
A cylindrical book-sewing machine characterized in that a lower part of the shield body along the cloth feed roller is a vertical surface. In the cylinder type main sewing machine according to claim 1 or 2 ,
One end of the shield body is provided with an oil core member in contact with the base end side of the cylinder portion from the bottom of the middle hook of the sewing machine and the other end in contact with the reflux mechanism. Type lockstitch sewing machine. In the cylinder type main sewing machine according to any one of claims 1 to 3 ,
A cylindrical lockstitch sewing machine, wherein a lubricating oil absorber that absorbs the lubricating oil is filled between an upper surface of the shield and a lower surface of the needle plate.

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