JP2006230805A - Oil feeding device for shuttle of sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an oil feeding device for a shuttle of a sewing machine, capable of expanding the adjustable width of the quantity of lubricant fed to the shuttle of the sewing machine. <P>SOLUTION: The oil feeding device 20 comprises an oil tank 21 for storing the lubricant, an oil feeding channel 22 for guiding the lubricant from the oil tank 21 to a shuttle shaft base 33, an oil feeding pump 27 for feeding the lubricant from the oil tank 21 to the shuttle shaft base 33 via the oil feeding channel 22, a reflux channel 23 for guiding almost all the lubricant fed to a shuttle mechanism 30 to the oil tank 21, and a reflux pump 28 for feeding the lubricant from the shuttle mechanism 20 to the oil tank 21 via the reflux channel 23. The oil feeding device 20 also has an oil discharging channel 24 for guiding a part of the lubricant from the downstream side from the oil feeding pump 27 in the oil feeding channel 22 to the oil tank 21, a distributor 25 for distributing the lubricant carried from the oil feeding pump 27 to the shuttle shaft base 33 side and to the oil tank 21 side, and a flow rate adjusting screw 26 as a flow rate-adjusting means for adjusting the flow rate of the lubricant to the oil discharging channel 24. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an oil supply device for a sewing machine hook, and more particularly, to an oil supply system for a sewing machine using an oil tank system that includes an oil tank that stores lubricating oil without using an oil pan.

The oil supply device of the sewing machine that supplies the lubricating oil to the hook mechanism is replaced with an oil pan system that collects and circulates excess oil in a dish-shaped oil pan arranged at the bottom of the sewing machine. An oil tank for storing lubricating oil, an oil supply path such as a hose and a tube for guiding the lubricating oil in the oil tank to the sewing machine, and a return path for returning the lubricating oil after lubricating the sewing machine to the oil tank again And. Further, there is known a sewing machine oiling device provided with a pump for forcibly conveying the lubricating oil on the lubricating oil supply side. Further, for example, when the oil tank is arranged at a high position, a pump is also provided on the return side in order to circulate the lubricating oil well (see, for example, Patent Document 1).
JP-A-9-168688

  However, in the conventional sewing machine oil supply device, the increase or decrease in the amount of lubricating oil supplied to the hook shaft base, that is, the adjustment range is narrow, and it responds to changes in the rotation speed of the sewing machine according to various sewing conditions. There was a problem that I could not. This is because a hose, a tube, and the like are connected to the downstream side of the sewing machine with the oil tank system, and in particular, in a sewing machine provided with an oil tank at a position equal to or higher than the sewing machine, the sewing machine Is provided with a reflux pump downstream, and a closed loop, that is, a lubricating oil circulation path, is formed, so that the supply flow rate and supply pressure are limited by the discharge pressure or discharge flow rate of the lubricating oil passing through the sewing machine. This is due to the fact that In a conventional sewing machine that discharges excess oil to the oil pan, the pressure on the downstream side of the hook mechanism is not greatly limited when oil is supplied to the hook mechanism. Since a closed loop is formed to return almost all of the oil to the oil tank, a large pressure difference between the upstream side and the downstream side of the hook mechanism cannot be taken, and the amount of oil supplied by the hook mechanism cannot be increased. There was a problem that the adjustment range (adjustment range) was limited.

  An object of the present invention is to provide an oil supply device for a sewing machine which can expand (improve) the adjustment range of the amount of lubricating oil supplied to the sewing machine.

In order to solve the above-mentioned problem, an invention according to claim 1 is directed to an oil tank for storing lubricating oil supplied to a hook mechanism having a hook shaft base that supports a sewing machine hook, and from the oil tank to the hook shaft base. An oil supply path for introducing the lubricating oil, an oil supply pump for supplying the lubricating oil from the oil tank to the hook shaft base via the oil supply path, and a reflux for introducing substantially the entire lubricating oil supplied to the hook mechanism to the oil tank A recirculation pump that sends lubricating oil from the hook mechanism to the oil tank via the recirculation path, and the hook shaft base is configured to supply the lubricating oil supplied from the oil tank via the oil supply path. An oil supply device for a sewing machine having an oil amount adjusting means for adjusting the amount of oil, an oil discharge path for guiding a part of lubricating oil from the downstream portion of the oil supply path to the oil tank, and the oil discharge Route A flow rate adjusting means for adjusting the flow rate of the lubricating oil, the oil supply device of a sewing machine hook, characterized in that it comprises a.
Here, “substantially the entire lubricating oil supplied to the hook mechanism” means a part of the oil consumed by the lubrication of the sliding portion of the hook mechanism among the oil supplied to the hook mechanism from the upstream side. This means the total amount of oil that is returned to the flow path after being lubricated on the sliding part and discharged, and oil that passes through without being supplied to the sliding part. is there.

  According to a second aspect of the present invention, in the oiling device for the sewing machine hook according to the first aspect, the two hook mechanisms are formed by the oil supply path and the reflux path. They are arranged in parallel in the circulation path.

  According to the first aspect of the present invention, by providing the oil discharge path for guiding a part of the lubricating oil from the downstream portion of the oil supply pump to the oil tank in the oil supply path, an extra lubricating oil is supplied when oil is supplied to the hook mechanism. Can be returned to the oil tank upstream of the shuttle mechanism. Further, by providing a flow rate adjusting means capable of adjusting the flow rate of the lubricating oil to be diverted to the oil draining path, it is possible to adjust the flow rate of the lubricating oil diverted to the oiling path side, via the oiling path. The amount of lubricating oil supplied to the shuttle mechanism can be adjusted as appropriate. Therefore, regardless of the flow rate and pressure on the reflux side, the flow rate or pressure on the supply path side can be freely adjusted according to the flow rate flowing on the oil drain path side, and the supply amount of lubricating oil supplied to the hook shaft base This adjustment range can be greatly expanded as compared with the prior art, and an appropriate amount of lubricating oil can be supplied in accordance with changes in the number of revolutions of the sewing machine according to various sewing conditions. In addition, this makes it possible to prevent the lubricating oil from scattering and leaking at the hook mechanism, and to prevent the lubricating oil from adhering to the sewing product that is a product.

  According to the invention described in claim 2, in addition to obtaining the same effect as that of the invention described in claim 1, in particular, the oil supply device for the sewing machine hook is provided with two hook mechanisms. Since the hook mechanisms are arranged in parallel in the circulation path formed by the oil supply path and the reflux path, in addition to the flow rate adjusting means for adjusting the flow rate of the lubricating oil divided into the oil discharge path, each hook By adjusting the flow rate of the lubricating oil distributed to the mechanism, the supply amount can be individually adjusted for each hook mechanism. Thereby, the adjustment range of the supply amount of the lubricating oil supplied to each hook mechanism can be further expanded.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a lubricating device for a sewing machine according to the present invention will be described in detail with reference to the drawings. The oil supply device 20 (hereinafter referred to as oil supply device 20) of the sewing machine according to the present embodiment has a two-needle lockstitch sewing machine 100 (hereinafter referred to as the sewing machine 100) having a pair of needle bars (not shown) and forming a seam that is substantially parallel to each other. ).

(Overall configuration of the embodiment)
As shown in FIG. 1, a sewing machine 100 includes a sewing machine frame 10 that forms most of the outer shape of the sewing machine 100 and two shuttle mechanisms disposed inside a bed portion 13 that constitutes the sewing machine frame 10. 30 and an oil supply device 20 according to the present embodiment for supplying lubricating oil to the shuttle mechanism 30.
Although not described in detail in the present embodiment, the sewing machine 100 is a needle driving mechanism (not shown) that drives a needle (not shown) up and down, and an object to be placed on the needle plate of the bed 13 of the sewing machine frame 10. A feed mechanism (not shown) that conveys the sewing product, a sewing motor (not shown) that applies a driving force to each mechanism portion of the sewing machine 100, and an upper shaft (not shown) that transmits the driving force of the sewing motor to each mechanism portion. The sewing machine has a basic configuration as a sewing machine for performing a main sewing on a sewing product, such as a lower shaft 5 that obtains a driving force from an upper shaft and transmits a driving force to a shuttle mechanism 30 and a feed mechanism (not shown).

The sewing machine frame 10 includes a bed portion 13 disposed on the lower side of the sewing machine 100, a vertical body portion 12 erected upward from one end side in the longitudinal direction of the bed portion 13, and an upper end side of the vertical body portion 12. To the upper part of the bed part 13 and an arm part 11 extending substantially in parallel with the bed part 13 and having a substantially U-shape when viewed from the side (see FIG. 1).
A hook mechanism 30 is built in one end portion of the bed portion 13 in the longitudinal direction (the end portion on the opposite side to the vertical body portion 12). Also, a bottom cover 14 is provided on the lower side of the bed portion 13 to prevent contact between the hook mechanism 30 and a feed mechanism (not shown) and an operator and dropping of oil leaking from the hook mechanism 30. ing.
Unlike the oil pan, the bottom cover 14 is not a cover for storing oil but a cover for covering the bottom of the bed portion 13.

The shuttle mechanism 30 includes a well-known sewing machine hook (horizontal hook) 31 including an outer hook and an inner hook fitted into the outer hook. A hook shaft 33 is disposed below the sewing machine hook 31. The sewing machine hook 31 is rotatably supported by the hook shaft base 33 via a vertical hook shaft.
The shuttle shaft 33 is formed with a flow path for guiding oil supplied from the oil tank 21 through an oil supply path 22 to be described later. The flow path is connected to the sewing machine hook 31 side and a reflux path 23 side to be described later. An oil amount adjusting screw 34 serving as an oil amount adjusting means for adjusting the amount of lubricating oil is provided in the middle of the branch path toward the reflux path 23 (see FIG. 4). In this embodiment in which sewing is performed with two needles, two hook mechanisms 30 and 30 are arranged in the longitudinal direction of the bed portion 13, and these hook mechanisms 30 and 30 are not shown in the figure. It is connected to the lower shaft 5 through a shaft gear. As a result, the sewing machine hooks 31, 31 are rotationally driven from the lower shaft 5 via the hook shaft gears.
The shuttle mechanisms 30 and 30 are arranged in parallel in a circulation path formed by an oil supply path 22 and a reflux path 23 of the oil supply device 20 described later (see FIG. 2). That is, an oil supply path 22 to be described later is bifurcated in front of the hook mechanism 30, and the oil branched into the two hands is supplied to the hook mechanisms 30 and 30, respectively. The oil discharged from the hook mechanisms 30, 30 is returned to the oil tank 21 as a single flow path, that is, a reflux path 23.
And the oil which is lubricating oil which reduces the friction of this sliding part can be supplied to the sliding part of the shuttle mechanisms 30 and 30, and oil is stored by the oil tank 21 of the oil supply apparatus 20 mentioned later. Yes.

(Oil supply system)
The oil supply device 20 according to this embodiment includes an oil tank 21 that stores lubricating oil supplied to the hook mechanism 30 having a hook shaft base 33 that supports the sewing machine hook 31, and lubricant oil from the oil tank 21 to the hook shaft base 33. An oil supply path 22 that leads, an oil supply pump 27 that sends the lubricating oil from the oil tank 21 to the hook shaft 33 via the oil supply path 22, and a return path that guides almost the entire lubricating oil supplied to the hook mechanism 30 to the oil tank 21. 23 and a reflux pump 28 for sending lubricating oil from the hook mechanism 30 to the oil tank 21 through the reflux path 23.
Further, the oil supply device 20 according to the present embodiment includes an oil discharge path 24 that guides part of the lubricating oil from the downstream portion of the oil supply path 27 to the oil tank 21 in the oil supply path 22, and the lubricating oil that is conveyed from the oil supply pump 27. Is distributed to the hook shaft base 33 side and the oil tank 21 side, the flow rate adjusting screw 26 which is a flow rate adjusting means for adjusting the flow rate of the lubricating oil to the oil discharge passage 24, and the above-described hook shaft bases 33, 33. And an oil amount adjusting screw 34 as an oil amount adjusting means.

  The oil tank 21 is a container having an inflow port and an outflow port, and the oil tank 21 in the present embodiment is disposed inside the vertical trunk portion 12, and has other configurations and supply destinations. It is disposed above the configuration of a hook mechanism 30. Oil supplied to each mechanism of the sewing machine 100 is stored in the oil tank 21. The oil is supplied from the oil tank 21 to the shuttle mechanism 30 via an oil supply path 22 described later. In addition, since the oil tank 21 is provided above the hook mechanism 30, a recirculation pump 28 driven by the lower shaft 5 is provided in the recirculation path 23, which will be described later, in order to raise the lubricating oil to the oil tank 21. It has been.

The oil supply path 22 is configured by a combination of hoses, tubes, pipes, and the like, and forms a flow path for conveying oil from the oil tank 21 to each hook mechanism 30.
In the present embodiment, the oil supply path 22 connects the oil tank 21 and the oil supply pump 27, the oil supply path 22 b that connects the oil supply pump 27 and the distributor 25, and the distributor 25 and the shuttle mechanism 30. It is comprised by the oil supply path | route 22c. That is, an oil supply pump 27 is disposed between the oil tank 21 and the hook mechanisms 30, 30, and a distributor (a flow divider) 25 is disposed between the oil pump 27 and the hook mechanisms 30, 30. (See FIG. 2).

  The oil supply pump 27 is a plunger pump that is driven in conjunction with the above-described lower shaft 5 that is rotationally driven in conjunction with the sewing operation of the sewing machine 100. That is, the oil pump 27 is always driven in conjunction with the lower shaft 5 during the sewing operation of the sewing machine 100, and a sufficient amount of oil is supplied to the hook shaft base 33 that supports the horizontal hook 31 at a flow rate proportional to the rotation thereof. Can be supplied. A distributor 25 is disposed downstream of the oil pump 27.

The distributor 25 includes one inflow port and two outflow ports, and an oil supply path 22b is connected to the outflow port, and an oil supply path 22c and an oil discharge path 24 are connected to the outflow port, respectively. . The oil sent from the oil supply pump 27 can be distributed in two directions. Further, a flow rate adjusting screw 26 is provided as a flow rate adjusting means on the one outlet side (outlet port connected to the oil draining route 24) side of the divided flow.
The flow rate adjusting screw 26 has a tapered end, ie, a substantially conical shape, and can be screwed into the flow path on the one outlet side formed inside the distributor 25 from the outside ( (See FIG. 3). In other words, the flow rate of the oil discharged from one outlet can be adjusted from zero to fully open by the amount of rotation operation of the flow rate adjusting screw 26. This also makes it possible to adjust the amount of oil discharged from the other outlet relatively (indirectly). That is, by operating the flow rate adjusting screw 26 to adjust the amount of oil discharged to one outlet, that is, the oil discharge path 24 from zero to fully open, the flow rate of oil flowing out to the other, that is, the oil supply path 22c. Can be adjusted in the range of about half or all of the oil flowing into the distributor 25 by the oil supply pump 27.

  The oil drainage path 24 is composed of a hose and a tube like the oil supply path 22, and one of the two outlets formed in the distributor 25 at one end is the flow on the side where the flow rate adjusting screw 26 is provided. The other end is connected to the oil tank 21 while being connected to the outlet. Accordingly, a part of the oil that is conveyed from the oil tank 21 and flows into the distributor 25 by the driving of the oil supply pump 27 is selectively returned to the oil tank 21 upstream of the hook mechanism 30, that is, in the middle of the oil supply path 22. Is possible.

The recirculation path 23 is configured by a combination of hoses, tubes, pipes, and the like, similar to the oil supply path 22, and forms a flow path for returning almost the entire oil that has passed through the hook mechanism 30 to the oil tank 21. ing.
Here, almost the entire oil that has passed through the hook mechanism 30 excludes a part of the oil that is consumed by the lubrication of the sliding portion of the hook mechanism 30 from the oil supplied to the hook mechanism 30 from the upstream side. The total amount of oil that is returned to the flow path after being lubricated on the sliding portion and discharged and passed through without being supplied to the sliding portion. .
A recirculation pump 28 is provided in the middle of the recirculation path 23 in the present embodiment to send oil that has passed through the hook mechanism 30 to the oil tank 21. The recirculation path 23 includes the recirculation path 30 and the recirculation pump 28. And a reflux path 23b that connects the reflux pump 28 and the oil tank 21 to each other.

  The reflux pump 28 is a plunger pump that is driven in conjunction with the lower shaft 5 in the same manner as the oil supply pump 27. That is, the oil supply pump 27 and the reflux pump 28 are both coaxial double pumps having the lower shaft 5 as a rotation axis, and the driving force for conveying oil is obtained by the rotation of the lower shaft 5. .

Next, the operation of the sewing machine oil supply device 20 according to the present embodiment will be described in detail with reference to the drawings.
When a sewing motor (not shown) is driven at the start of the manufacturing operation, the lower shaft 5 is rotated via the upper shaft, the pulley, the belt, and the like. The pump 27 and the reflux pump 28 are driven.
By driving the oil supply pump 27, the oil in the oil tank 21 is forcibly sucked out through the oil supply path 22a, passes through the oil supply pump 27, and then flows into the distributor 25 through the oil supply path 22b.
Here, when the flow rate adjusting screw 26 is loosened, the flow path on the oil drainage path 24 side is fully opened, and the oil that has flowed into the distributor 25 from the inflow port is almost supplied to the oil supply path 22c and the oil drainage path 24. The same amount is distributed. On the other hand, the oil distributed to the oil discharge path 24 is guided to the oil discharge path 24 and is returned to the oil tank 21. When the flow rate adjusting screw 26 is rotated, the inflow to the oil drainage passage 24 side is gradually reduced according to the amount of rotation, while the supply flow rate to the shuttle mechanism 30 side is increased.
On the other hand, the oil discharged to the oil supply path 22c is guided to the oil supply path 22c and supplied to the hook shafts 33 and 33 of the hook mechanisms 30 and 30. Here, by adjusting the flow rate adjusting screw 26 from the fully closed state to the fully opened state by operating the flow rate adjusting screw 26, the flow rate of the oil to the hook mechanism 30 can be adjusted to nearly twice. Become.
The oil supplied to the hook shafts 33, 33 is appropriately distributed according to the rotational operation amount of the oil amount adjusting screws 34, 34 of the hook shafts 33, 33, and the hook shafts of the two hook mechanisms 30, 30 are distributed. 33 and 33 are respectively supplied.
Inside the hook shafts 33, 33, as in the case described above, an oil amount adjusting screw provided on the discharge side while oil flowing in from the upstream side passes through the hook shaft base 33 toward the downstream side. A part of the oil passes through the oil core 35 in accordance with the pressure in the hook shaft 33 due to the screwing condition 34, is supplied to the sewing machine hook 31, and other oil is discharged from the hook shaft base 33 as it is.
The oil discharged from the hook shafts 33 and 33 is forcibly conveyed by the reflux pump 28, passes through the reflux paths 23 a and 23 b, and is returned to the oil tank 21.

As described above, according to the sewing machine 100 according to the present embodiment, the hook mechanism is provided by providing the oil discharge path 24 that guides a part of the lubricating oil from the downstream portion of the oil supply pump 27 in the oil supply path 22 to the oil tank 21. Lubricating oil that is excessive when refueling 30 can be returned to the oil tank 21 upstream of the hook mechanism 30. Further, the flow rate adjusting screw 26 is provided as a flow rate adjusting means capable of adjusting the flow rate of the oil divided into the oil discharge passage 24, so that the flow rate of the oil divided toward the oil supply route 22c is relatively (indirectly). The amount of oil supplied to the shuttle mechanism 30 through the oil supply path 22c can be adjusted as appropriate. Therefore, by providing the distributor 25 and the flow rate adjusting screw 26 in the oil supply path 22 upstream of the hook mechanism 30, the adjustment range of the amount of oil supplied to the hook shaft 33 is greatly expanded compared to the conventional case. Accordingly, an appropriate amount of oil can be supplied in accordance with the change in the rotational speed of the sewing machine hook 31 according to various sewing conditions. Moreover, this can prevent oil from splashing or leaking in the hook mechanism 30 and can prevent oil from adhering to the sewing product that is the product.
In addition, the sewing machine refueling device 20 is provided with two hook mechanisms 30, which are arranged in parallel in a circulation path formed by the oil supply path 22 and the reflux path 23. Therefore, in addition to the flow rate adjusting screw 26 that adjusts the flow rate of the oil that is diverted to the oil discharge path 24 side, by adjusting the flow rate of the oil distributed to the respective shuttle mechanisms 30, 30, each shuttle mechanism 30, The oil supply amount can be individually adjusted for 30. Thereby, it becomes possible to further expand the adjustment range of the oil amount supplied to each hook mechanism 30, 30.
In the present embodiment, the flow rate adjusting screw 26 serving as the flow rate adjusting unit is provided only on the outlet side connected to the oil tank 21 out of the two outlets formed in the distributor 25. It is not limited to. That is, it is good also as a structure provided only in the outflow port connected with the shuttle mechanism 30, and it is good also as a structure provided in any outflow port.
Further, in the present embodiment, the oil supply device 20 for the sewing machine hook according to the present invention has been described by taking a two-needle lockstitch sewing machine as an example, but it can be applied to a sewing machine including two or more hook mechanisms 30. .

It is the schematic which shows the whole structure of the oil supply apparatus of the sewing machine hook which concerns on this embodiment. It is a mimetic diagram showing the whole oil supply circuit in the oil supply device of a sewing machine hook concerning this embodiment. It is a schematic diagram which shows the divider | distributor (divider) 25 in this embodiment. It is sectional drawing which shows the inside of the shuttle mechanism 30 in this embodiment.

Explanation of symbols

5 Lower shaft 10 Sewing machine frame 11 Arm portion 12 Vertical trunk portion 13 Bed portion 14 Bottom cover 20 Oil supply device 21 Oil tank 22 Oil supply route 23 Recirculation route 24 Oil discharge route 25 Distributor (distributor)
26 Flow rate adjusting screw (taper)
27 Oil supply pump (plunger pump)
28 Reflux pump (〃)
30 Hook mechanism 31 Sewing machine hook (Horizontal hook)
33 Hoist base 34 Oil amount adjusting screw 35 Oil core 100 Sewing machine

Claims (2)

An oil tank for storing lubricating oil to be supplied to a hook mechanism having a hook shaft base for supporting the sewing machine hook;
An oil supply path for guiding lubricating oil from the oil tank to the shuttle shaft;
An oil supply pump that sends lubricating oil from the oil tank to the shuttle shaft through the oil supply path;
A reflux path for guiding substantially all of the lubricating oil supplied to the hook mechanism to the oil tank;
A reflux pump for sending lubricating oil from the hook mechanism to the oil tank via the reflux path;
An oil amount adjusting means provided on the shuttle shaft base and adjusting an amount of lubricating oil supplied from the oil tank via the oil supply path;
An oil discharge path for guiding part of the lubricating oil from the downstream portion of the oil supply path to the oil tank in the oil supply path;
And a flow rate adjusting means for adjusting the flow rate of the lubricating oil to the oil drainage path.   The two hook mechanisms are provided, and the two hook mechanisms are arranged in parallel in a circulation path formed by the oil supply path and the reflux path. Sewing machine oiling device.

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