JP2011110350A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine configured to seal a part of a transmitting mechanism within a mechanism chamber together with oil, which can store a lot of oil in the mechanism chamber to lubricate the mechanism therein while preventing leak of oil from the mechanism chamber, and further can lubricate also a mechanism out of the mechanism chamber. <P>SOLUTION: The sewing machine includes an oil tank 5 having the mechanism chamber 5a storing a part of the transmission mechanism of a cloth feeding device, a float chamber 5b as a separate space separated from the mechanism chamber, and communicating pipes 5c, 5d allowing distribution of air and oil between the mechanism chamber and the float chamber. A hole allowing distribution of air and oil between the inside and outside of the tank is provided on a side wall of the float chamber. At least an upper space 5c1 within the communicating pipes is disposed at a level higher than the lower end of the hole, extending between the mechanism chamber and the float chamber. The sewing machine further includes a circulating oil supply mechanism (3, 8a, 8b, 8c) configured to suck oil from the tank, supply the oil to the mechanism of a shuttle K out of the tank, and return the oil to the tank, and an oil supply mechanism (3, 11a, 11b) configured to suck oil stored in an oil pan 9 and supply the oil to the tank. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an oil supply mechanism for a sewing machine.

  Conventionally, an oil pan or an oil tank has been used as an oil reservoir for supplying oil to each drive mechanism of the sewing machine.

For example, as described in Patent Document 1 (paragraphs 0011-0013 and FIG. 4), oil stored in an oil pan installed at the lower part of the sewing machine is pumped out by a pump and supplied to a drive mechanism unit via a supply pipe. There is something. Also, the oil returns to the oil pan through the reflux pipe.
Further, the invention of the application of Patent Document 1 is provided with a blocking member (31 in the same document) that blocks a surface portion on which a balance of a sewing machine body is installed and a gear portion that transmits rotation of the upper shaft to the lower shaft. A grease storage portion is formed on the side to store the grease, and the grease stored in the grease storage portion lubricates at least one sliding portion of the mechanical parts in the surface portion, and at least one sliding portion in the gear portion Is configured to be lubricated with oil, and the surface portion of the sewing machine main body is cut off from the gear portion that is lubricated with oil so as to prevent the gear portion from entering the oil surface portion. The gear section is refueled from an oil pan.

  An example of the oil tank is described in Patent Document 2. In the oil tank described in Patent Document 2, it is possible to prevent at least one of a change in the amount of lubricating oil supplied to the sliding portion and an outside jet of the lubricating oil when the sewing machine body is tilted. In order to ensure high performance, the top wall of the tank body is provided with a canopy part that has an air reservoir that communicates with the internal space of the tank body, and a reflux port is provided in this canopy part. , A spray blocking wall is provided on the inner surface of the top wall of the tank body to prevent the lubricating oil stored inside the tank body from being ejected from the air vent hole to the outside of the tank body when the sewing machine body is tilted. It was.

  On the other hand, there is a case where the feed mechanism of the sewing fabric is configured by taking out the rotational power of the lower shaft. In this case, it is necessary to configure a transmission mechanism that transmits the rotational power of the lower shaft to a member that feeds the cloth while converting the rotational power into a reciprocating motion with predetermined levitation. At this time, a part of the transmission mechanism and a part connected to the transmission mechanism of the lower shaft are confined together with oil in a sealed box, and the oil is agitated by a rotating member such as a gear that circulates in the sealed box. In some cases, a configuration has been adopted in which oil is supplied to each of the transmission machine parts.

JP-A-10-137479 JP 2007-296096 A

However, according to the lubrication method in which a part of the transmission mechanism is confined together with the oil in the sealed box, since the lower shaft or the like penetrates the wall of the sealed box inward and outward, oil may leak to the outside. The oil could not be stored.
Further, since the rotation of the stirring member synchronizes with the rotation of the sewing machine, the pressure in the sealed box may increase during the rotation of the sewing machine, which may also cause oil leakage.
In order to prevent this increase in pressure, it was necessary to provide an air hole in the housing box of the transmission mechanism, but this air hole needs to be small because there is a risk of oil leakage, and at the time of shipping the sewing machine, In order to prevent oil leakage from the air holes, it was necessary to take measures such as closing the air holes with rubber.

The present invention has been made in view of the above problems in the prior art, and in a sewing machine that confines a part of the transmission mechanism in the mechanism chamber together with oil and lubricates the transmission mechanism, oil leakage from the mechanism chamber is prevented, It is an object of the present invention to provide a sewing machine that can store a lot of oil and lubricate a mechanism in a mechanism chamber.
Furthermore, another object is to configure an oil supply mechanism that supplies oil to a mechanism outside the mechanism chamber.

The invention described in claim 1 for solving the above-described problems is a mechanism chamber in which a part of a transmission mechanism for driving a sewing machine is housed, a separate space apart from the mechanism chamber, and the mechanism chamber and the separate space. An oil tank having a communication pipe that allows air and oil to flow therethrough,
A hole that allows air and oil to flow from the inside to the outside of the oil tank is provided in the side wall of the separate space,
At least the upper space inside the communication pipe is a sewing machine arranged above the lower end of the hole across the mechanism chamber and the separate space.

The invention according to claim 2 includes an oil supply passage for replenishing oil to the mechanism chamber and the separate space from the outside,
2. The sewing machine according to claim 1, wherein the separate space is a float chamber for storing a float for measuring a remaining amount of oil in the oil tank.

  A third aspect of the present invention is the sewing machine according to the second aspect, further comprising a circulation type oil supply mechanism that sucks oil from the oil tank, supplies the oil to a mechanism outside the oil tank, and returns the oil to the oil tank. It is.

  According to a fourth aspect of the present invention, there is provided an oil pan disposed in a lower region including a position directly below the hole, and an oil supply mechanism that sucks the oil stored in the oil pan and supplies the oil to the oil tank. The sewing machine described in 1. above.

  According to the present invention, even if a large amount of oil is supplied into the oil tank including the mechanism chamber and the separate space, the oil overflowing from the hole provided in the side wall of the separate space is discharged. Since the oil level does not exceed the lower end of the hole, at least the upper space inside the communication pipe that connects the mechanism chamber and the separate space is disposed above the lower end of the hole across the mechanism chamber and the separate space. The airway connecting the mechanism chamber and the separate space is secured, and even if oil is stirred in the mechanism chamber, the air in the upper part of the mechanism chamber communicates with the outside through the communication pipe, the separate space and its hole. An increase in internal pressure is suppressed, oil leakage from the mechanism chamber can be prevented, and a large amount of oil can be stored to lubricate the mechanism in the mechanism chamber.

  Further, according to the invention described in claim 2, an oil tank capable of replenishing oil can be configured, and the amount of remaining oil can be determined by measuring a relatively stable oil level in a separate space away from the mechanism chamber with a float. There is an effect that it can be measured accurately.

  Further, according to the third aspect of the present invention, there is an effect that an oil supply mechanism that supplies oil to a mechanism outside the mechanism chamber can be configured using the oil tank as an oil storage source (supply source).

  Further, according to the invention described in claim 4, there is an effect that oil overflowing from a hole provided in the side wall of another space can be received by the oil pan and returned to the oil tank again.

The inside of a sewing machine bed part is drawn with the front view of the sewing machine concerning one embodiment of the present invention. It is a front internal view of the oil tank of the sewing machine which concerns on one Embodiment of this invention. FIG. 5 is a front internal view (a) of an oil tank according to another embodiment of the present invention, and a front internal view (b) of an oil tank according to another embodiment.

  An embodiment of the present invention will be described below with reference to the drawings. The following is one embodiment of the present invention and does not limit the present invention.

First, an embodiment of the present invention will be described with reference to FIGS.
As shown in FIG. 1, the sewing machine 1 of the present embodiment includes a lower shaft 2, a plunger pump 3, a hook 4, an oil tank 5, an oil supply port 6, and an oil supply pipe 7 from the oil supply port 6 to the oil tank 5. , Oil supply pipes 8 a and 8 b to the hook 4, a return pipe 8 c, an oil pan 9, a circulation filter 10, oil supply pipes 11 a and 11 b from the oil pan 9 to the oil tank 5, and an oil remaining amount display portion 12. And a float 13.

As shown in FIG. 2, the oil tank 5 includes a mechanism chamber 5a, a float chamber 5b, an upper communication pipe 5c, a lower communication pipe 5d, a hole 5e on the side wall of the float chamber 5b, and an oil supply pipe connection port 5f. The oil L is stored.
As shown in FIG. 1, an oil pan 9 is disposed in a lower region including a position directly below the hole 5e.

  The lower shaft 2 is driven to rotate by receiving rotational power from a power source such as an electric motor (not shown). The lower shaft 2 passes through the mechanism chamber 5 a of the oil tank 5. The space between the outer wall portion of the mechanism chamber 5a and the peripheral surface of the lower shaft 2 is sealed so that the oil L does not leak. In the mechanism chamber 5a, a transmission mechanism including gears, links and the like constituting the cloth feeding device is housed and lubricated by the oil L in the mechanism chamber 5a.

  The lower shaft 2 is provided with a plunger pump 3 at a site adjacent to the mechanism chamber 5a. The plunger pump 3 is driven by the rotation of the lower shaft 2. The plunger pump 3 is composed of two pumps.

The sewing machine 1 includes a circulation type oil supply mechanism that sucks the oil L from the oil tank 5 to supply the oil to a mechanism that operates the hook 4 that is a mechanism outside the oil tank 5 and returns the oil L to the oil tank 5. . The oil flow by this oil supply mechanism is as follows.
When the plunger pump 3 is driven, the oil L is sucked from the lower part of the mechanism chamber 5a of the oil tank 5 through the oil supply pipe 8a. Further, the oil that has passed through one pump of the plunger pump 3 is supplied to a mechanism for operating the hook 4 through an oil supply pipe 8b. The oil returns from the oil discharge port of the mechanism for operating the hook 4 to the upper part of the mechanism chamber 5a of the oil tank 5 through the reflux pipe 8c.

The sewing machine 1 includes an oil supply mechanism that sucks oil stored in the oil pan 9 and supplies the oil to the oil tank 5. The oil flow by this oil supply mechanism is as follows.
When the plunger pump 3 is driven, oil is sucked from the oil pan 9 through the circulation filter 10 and the oil supply pipe 11a, and the oil that has passed through the other pump of the plunger pump 3 passes through the oil supply pipe 11b, The oil is fed to the oil supply pipe 7 from the oil supply port 6 to the oil tank 5 and supplied to the oil tank 5.
Note that the present oiling mechanism may be omitted.

Now, the structure of the oil tank 5 will be described in detail with reference to FIG.
As shown in FIG. 2, the mechanism chamber 5a of the oil tank 5 and the float chamber 5b are arranged apart from each other in the horizontal direction.
Both the upper communication pipe 5c and the lower communication pipe 5d are arranged horizontally. However, the lower communication pipe 5d is disposed below the upper communication pipe 5c.
One end of the upper communication pipe 5c is connected to the mechanism chamber 5a, and the other end is connected to the float chamber 5b. Similarly, one end of the lower communication pipe 5d is connected to the mechanism chamber 5a, and the other end is connected to the float chamber 5b.
The upper communication pipe 5c and the lower communication pipe 5d allow air and oil to flow between the mechanism chamber 5a and the float chamber 5b.

A hole 5e is provided in the side wall of the float chamber 5b. The holes 5e allow air and oil to flow between the inside and the outside of the oil tank 5.
Therefore, the oil level in the oil tank 5 does not exceed the lower end of the hole 5e.
At least the upper space 5c1 inside the upper communication pipe 5c is disposed above the lower end of the hole 5e across the mechanism chamber 5a and the float chamber 5b.
Therefore, an air passage connecting the mechanism chamber 5a and the float chamber 5b is secured by the upper space 5c1, and even if the oil L is stirred in the mechanism chamber 5a, the air above the mechanism chamber 5a is allowed to remain in the upper communication pipe 5c and the float chamber. Since the fluid tank 5 communicates with the outside of the oil tank 5 through the hole 5e and the hole 5e, an increase in the internal pressure in the mechanism chamber 5a is suppressed. Therefore, oil leakage from the mechanism chamber 5a due to an increase in internal pressure is prevented.

An oil supply pipe connection port 5f is formed on the upper side of the lower communication pipe 5d. The lower end of the oil supply pipe 7 from the oil supply opening 6 to the oil tank 5 is connected to the oil supply pipe connection opening 5f.
When oil is supplied from the oil supply port 6 or when oil is supplied from the oil supply pipe 11b, the oil flows down the oil supply pipe 7 and flows into the lower communication pipe 5d from the oil supply pipe connection port 5f and branches. It flows into the chamber 5a and the float chamber 5b. In other words, the oil supply pipe 7 and the lower communication pipe 5d form an oil supply path for supplying oil to the mechanism chamber 5a and the float chamber 5b from the outside.
The float 13 is stored in the float chamber 5b. The float 13 moves up and down according to the oil level in the float chamber 5b. The remaining oil amount is displayed on the remaining oil amount display unit 12 according to the vertical position of the float chamber 5b.

When the entire lower communication pipe 5d is formed to have the same inner diameter, the oil level rise in the large-capacity mechanism chamber 5a is delayed due to the high viscosity of the oil L, and the oil level rise in the float chamber 5b is accelerated. As a result, the oil level is different between the mechanism chamber 5a and the float chamber 5b, so that the remaining amount of oil in the oil tank 5 cannot be accurately measured, and the oil tank 5 is filled with oil to the maximum capacity. Becomes difficult.
Therefore, in the sewing machine 1, a portion including a branch portion from the oil supply pipe connection port 5f of the lower communication pipe 5d is configured by the taper pipe part 5g. The tapered tube portion 5g is formed in a tapered shape with the end on the mechanism chamber 5a side having a large diameter (φA) and the end on the float chamber 5b side having a small diameter (φB). For example, φA = 6 [mm] and φB = 4.5 [mm].
The taper tube portion 5g makes the oil level rise equal in the mechanism chamber 5a and the float chamber 5b when oil is replenished, and the remaining amount of oil in the oil tank 5 can be accurately measured and displayed. The tank 5 can be filled with oil to the maximum capacity.

  In the above embodiment, a separate space in which a hole is provided in the side wall apart from the mechanism chamber is used as a floating chamber. However, this separate space is not used as a floating chamber, and FIG. You may comprise as shown to b).

  In the oil tank 5K shown in FIG. 3A, another space in which a hole is provided is a vertical pipe 5h. The upper end of the vertical pipe 5h is connected to the upper communication pipe 5c, the lower end is connected to the lower communication pipe 5d, and the mechanism chamber 5a and the vertical pipe 5h communicate with each other via the upper communication pipe 5c and the lower communication pipe 5d. A hole 5e having the same purpose as in the above embodiment is provided at the upper end of the vertical tube 5h.

  The oil tank 5L shown in FIG. 3 (b) is substantially the same as the oil tank 5K shown in FIG. 3 (a), but the joint part 5m connecting the vertical pipe 5h and the upper communication pipe 5c is the same as the above embodiment. The desired hole 5e is provided. The lower end of the vertical pipe 5h is connected to the lower communication pipe 5d via a joint part 5n.

  In order to carry out the present invention, only the upper communication pipe 5c is sufficient as a communication pipe that allows air and oil to flow between the mechanism chamber and the float chamber, but in the above embodiment, Since an oil tank that can be replenished and has a float chamber is configured, it is preferable that the lower communication pipe 5d is also configured. By replenishing oil from the lower communication pipe 5d, the oil level in the oil tank 5 is gradually raised from below, and it becomes easy to secure an airway in the upper communication pipe 5c. Further, since the bottom of the mechanism chamber 5a and the bottom of the float chamber 5b communicate with each other through the lower communication pipe 5d, the oil level is balanced between the mechanism chamber 5a and the float chamber 5b even when oil is consumed. And the remaining amount of oil can be accurately measured. Therefore, it is preferable to arrange the entire internal space of the lower communication pipe 5d lower than the lower end of the hole 5e, and it is preferable to provide it as low as possible. However, it is not necessary to make it lower than the bottom of the mechanism chamber 5a and the float chamber 5b.

  In the above embodiment, the upper communication pipe 5c and the hole 5e are arranged so that the lower end height position of the hole 5e is within the range of the internal space of the upper communication pipe 5c. Therefore, air flows between the mechanism chamber 5a and the float chamber 5b via the upper communication pipe 5c, but when the oil level is high, the mechanism chamber 5a and the float chamber 5b via the upper communication pipe 5c. Oil can also be distributed between the two. Regardless of this, the entire internal space of the upper communication pipe 5c may be made higher than the lower end of the hole 5e. In this case, it is preferable to provide the upper communication pipe 5c at a position as high as possible so as to allow only air flow. This is because if oil flows from the mechanism chamber 5a into the float chamber 5b at a position higher than the hole 5e, the oil is discharged from the hole 5e.

1 Sewing machine 2 Lower shaft 3 Plunger pump 4 Hook 5 Oil tank 5a Mechanism chamber 5b Float chamber (separate space)
5c Upper communication pipe 5d Lower communication pipe 5e Hole 5f Oil supply pipe connection port 5g Taper pipe part 6 Oil supply port 7 Oil supply pipe 8a, 8b Oil supply pipe 8c Recirculation pipe 9 Oil pan 10 Circulating filters 11a, 11b Oil supply pipe 12 Oil remaining amount display part 13 Float L Oil

Claims (4)

A mechanism chamber in which a part of a transmission mechanism for driving a sewing machine is housed; a separate space apart from the mechanism chamber; and a communication pipe that enables air and oil to flow between the mechanism chamber and the separate space. With an oil tank,
A hole that allows air and oil to flow from the inside to the outside of the oil tank is provided in the side wall of the separate space,
A sewing machine in which at least the upper space inside the communication pipe is disposed above the lower end of the hole across the mechanism chamber and the separate space. An oil supply passage for replenishing oil to the mechanism chamber and the separate space from the outside;
The sewing machine according to claim 1, wherein the separate space is a float chamber for storing a float for measuring the amount of oil remaining in the oil tank. The sewing machine according to claim 2, further comprising a circulation type oil supply mechanism that sucks oil from the oil tank, supplies the oil to a mechanism outside the oil tank, and returns the oil to the oil tank. The sewing machine according to claim 3, further comprising: an oil pan disposed in a lower region including a position directly below the hole; and an oil supply mechanism that sucks oil stored in the oil pan and supplies the oil to the oil tank.

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