JP2011062302A - Needle bar oil discharge device of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a needle bar oil discharge device of a sewing machine, which is capable of reducing the collection of the excess of lubricating oil supplied to a needle bar at a bearing lower end. <P>SOLUTION: In the needle bar oil discharge device of the sewing machine including a bearing fixed to a frame in which a first oil absorbing member is arranged in an inner groove in the middle of a needle bar sliding surface and an oil discharge pipe connected to the frame and performing a suction operation in association with the rotation of a main shaft, a part of the lubricating oil supplied to the needle bar is returned through the oil discharge pipe to an oil reservoir at the bottom part of the sewing machine. A relief hole communicating with the inner groove of the bearing and the frame is perforated, and the oil discharge pipe is connected to the exit of the relief hole. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a needle bar oil discharging device for a sewing machine that returns an excess amount of lubricating oil supplied to the needle bar to an oil sump at the bottom of the sewing machine.

  As a conventional needle bar oil discharging device for a sewing machine, an oil drain pipe that performs a suction operation in conjunction with the rotation of the main shaft returns an excess amount of lubricating oil supplied to the needle bar to a sump at the bottom of the sewing machine. (For example, see Patent Document 1). The needle bar is supported by a bearing fixed to the frame so as to be slidable up and down, and the needle at the lower end of the needle bar intermittently penetrates the dough loading surface in conjunction with the rotation of the main shaft. Oil is supplied to the needle bar from above the bearing, and the oil supplied to the needle bar enters the cylindrical felt (first oil absorbing member) in the groove in the bearing by the vertical movement of the needle bar. As a result, the sliding surface of the bearing was lubricated with oil, and excess oil was sucked from the oil drain pipe at the lower end of the bearing.

Japanese Utility Model Publication No. 1-155986 (page 2-3, FIG. 2-5)

However, in the conventional needle bar oil discharge device for a sewing machine, when the sewing machine is driven at a medium to low speed, the oil accumulated at the lower end of the bearing, that is, the excess lubricant supplied to the needle bar is not sufficiently sucked by the oil drain pipe. was there. When such a situation occurs, excess oil always stays at the lower end of the bearing, and there is a concern that the fabric under the needle bar is stained with the oil.
Accordingly, an object of the present invention is to provide a needle bar oil discharging device for a sewing machine that can reduce the excessive amount of lubricating oil supplied to the needle bar from staying at the lower end of the bearing.

  In order to achieve the above object, the present invention provides a bearing that is fixed to a frame and has a first oil absorbing member disposed in an inner groove in the middle of a needle bar sliding surface, and a suction operation that is connected to the frame and interlocks with the rotation of the main shaft. In the sewing machine needle bar oil discharge device, which has a drain pipe that performs the operation, and returns part of the lubricating oil supplied to the needle bar to the oil sump at the bottom of the sewing machine via the oil drain pipe, a relief hole communicating with the inner groove of the bearing and the frame And an oil drain pipe is connected to the outlet of the escape hole.

  The escape hole is connected to the first passage extending horizontally to the right from the inner groove of the bearing, the second passage communicating with the first passage and inclined upward, and the second passage communicating with the second passage. It is desirable to comprise with the 3rd channel | path which has. Further, a second oil absorbing member may be disposed in the first passage of the escape hole, and the oil absorbing member may be connected to the first oil absorbing member.

  According to the present invention, the relief hole communicating with the inner groove and the frame of the bearing is formed, and the oil drain pipe is connected to the outlet of the relief hole, so that the surplus amount of lubricating oil supplied to the needle bar is at the lower end of the bearing. Before it stays, it is sucked by the oil drain pipe. Further, if the escape hole is constituted by the first passage, the second passage, and the third passage, the wiring inside the frame can be made orderly, and not only the appearance but also the appearance on the inside can be improved. Furthermore, when the second oil absorbing member is disposed in the escape hole and the oil absorbing member is connected to the first oil absorbing member, oil suction toward the oil drain pipe can be promoted.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the needle bar 1 is supported by a bearing 2 so as to be slidable up and down, and the bearing 2 is fixed to the frame MH by screws 3. The frame MH includes a hollow main chamber and a head chamber, and both chambers are partitioned by a partition wall MW. The upper end of the needle bar 1 is connected to the arm 6 of the swing shaft 5 via a pin 4, and the rod 8 attached to the main shaft S with a screw 7 is connected to the lever 10 of the swing shaft 5 via a pin 9. Yes. As shown in FIG. 2, the arm 6 and the lever 10 are fixed to the swing shaft 5 by screws 6a and 10a, respectively. The rocking shaft 5 is supported by bushes 11A and 11B fixed to the frame, and the collar 12 and the E-type retaining ring 13 arranged with the bush 11B interposed therebetween restrict the movement of the rocking shaft 5 in the thrust direction. When the main shaft S rotates, the swing shaft 5 swings and the tip of the arm 6 moves in an arc. The needle bar 1 reciprocates up and down along the bearing 2 by the arc movement of the arm 6, and the needle 1a attached to the lower end of the needle bar 1 intermittently penetrates the fabric loading surface MB. The oil supply pipe 14 extends from the main chamber to the head chamber through the partition wall MW, and the oil exuded from the oil supply pipe 14 is scattered by the arc movement of the arm 6 that is also located in the head chamber. Accordingly, the movable member in the head chamber is lubricated with oil, and excess oil in the head chamber is returned to the oil sump 25 at the bottom of the sewing machine through the partition wall MW and the like.

  The bearing 2 has an inner groove 2a in the middle of the sliding surface of the needle bar, and a vertically open cylindrical felt 15 is stored in the inner groove 2a. As shown in FIG. 3, a relief hole 16 communicating with the inner groove 2 a of the bearing 2 and the frame MH is formed. The relief hole 16 is connected to the first passage 16a extending horizontally to the right from the inner groove 2a of the bearing, the second passage 16b communicating with the first passage 16a and inclined upward and the second passage 16b. It consists of a third passage 16c having an outlet for connecting an oil pipe. A rod-like felt 17 (oil absorbing member) is disposed in the first passage 16a, and a pipe 18 for connecting an oil drain pipe is screwed into the outlet of the third passage 16c. One end of the rod-like felt 17 is connected to the cylindrical felt 15, and the other end protrudes into the second passage 16 b. The front end of the second passage 16b is sealed with a worm screw 19, and the left end of the third passage 16c is sealed with a lateral cover 20. Thus, since the escape hole 16 is provided in communication with the frame MH, the passage state is not changed even when the lateral cover 20 is attached and detached by various operations.

  The bearing 2 is provided with outer grooves 2b and 2b on the outer periphery, and the outer grooves 2b and 2b are positioned above and below the first passage 16a. O-rings 21 and 21 are attached to the outer grooves 2b and 2b, so that the oil absorbed by the rod-like felt 17 does not hang down from the gap between the frame MH and the bearing 2 toward the fabric loading surface MB. An oil drain pipe 22 is connected to the pipe 18 at the outlet of the escape hole 16. The oil drain pipe 22 is connected to a suction port 23a of a trochoid pump 23 disposed at the bottom of the sewing machine, and a worm wheel 23b of the trochoid pump 23 meshes with a gear portion of the main shaft S. When the worm wheel 23 b rotates with the rotation of the main shaft S, a suction force is generated at the suction port 23 a of the trochoid pump 23. That is, the excess oil in the bearing 2 flows from the inner groove 2a through the escape hole 16 to the oil drain pipe 22 by the suction force generated at the suction port 23a, and finally returns to the oil reservoir 25 at the bottom of the sewing machine. Note that it is desirable that the arrangement of the rod-like felt 17 be maintained in the first passage 16a even if a suction force is generated in the suction port 23a of the pump 23.

  In the present embodiment, the details of the rod-shaped felt are not shown, but if a separate rod-shaped felt is provided on the inner groove 2a side of the bearing and the frame MH side, and they are connected, Assembly to the bearing 2 is facilitated.

It is the side view which showed the outline | summary of the needle bar oil discharging apparatus of the sewing machine which concerns on this invention. It is the disassembled perspective view which showed the components structure of the sewing machine needle bar mechanism applied to the same apparatus. It is explanatory drawing which showed the relationship between the principal part (AA cross section of FIG. 1) around a bearing, and an oil drain pipe.

1 Needle bar 2 Bearing 2a Inner groove 15 Tubular felt (first oil absorbing member)
16 Relief hole 16a 1st channel | path 16b 2nd channel | path 16c 3rd channel | path 17 Rod-shaped felt (2nd oil absorption member)
22 Oil drain pipe 25 Oil reservoir MH frame

Claims (3)

A bearing that is fixed to the frame and has a first oil absorbing member disposed in an inner groove in the middle of the needle bar sliding surface and an oil drain pipe that is connected to the frame and performs a suction operation in conjunction with the rotation of the main shaft are supplied to the needle bar. In the sewing machine needle bar oil discharge device that returns a part of the lubricating oil to the oil sump at the bottom of the sewing machine via the oil drain pipe,
A needle bar oil discharging device for a sewing machine, wherein an escape hole communicating with an inner groove of a bearing and a frame is formed, and an oil drain pipe is connected to an outlet of the escape hole.   The relief hole has a first passage that extends horizontally to the right from the inner groove of the bearing, a second passage that communicates with the first passage and slopes upward, and an outlet for connecting the oil drain pipe to the second passage. The needle bar oil discharging device for a sewing machine according to claim 1, comprising a third passage having the needle passage oil.   The needle bar oil discharge device for a sewing machine according to claim 2, wherein a second oil absorbing member is disposed in the first passage of the escape hole, and the oil absorbing member is connected to the first oil absorbing member.

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