JP4830385B2 - sewing machine - Google Patents

Description

  The present invention relates to a sewing machine, and in particular, an electric motor for driving a drive mechanism equipped in the sewing machine is attached to a motor attachment region provided on the lower surface side of a bed portion.

  2. Description of the Related Art Conventionally, in an eyelet sewing machine for industrial use that sews eyelet stitching stitches made up of eyelet stitching stitches and a pair of left and right linear stitching stitches, a cloth that presses a work cloth onto a feed base. A presser mechanism, a sewing mechanism that synchronizes and drives the needle bar and the looper facing the needle bar, and a rotation drive mechanism that rotates the looper base and the needle bar provided with the looper around the vertical axis are provided. , A feed mechanism for moving the feed base on which the work cloth is placed in the X direction and the Y direction, a thread trimming mechanism, and the like are provided. Based on various stitch data such as eyelet stitching stitches, By driving and controlling the feed mechanism and the rotation mechanism, various eyelet stitches are formed.

  This kind of eyelet sewing machine includes an X-direction drive motor and a Y-direction drive motor for a feed mechanism, a rotation motor (a so-called θ motor) for a rotation drive mechanism for rotating a needle bar and a looper base, and a sewing mechanism. A plurality of electric motors such as a main motor for driving the motor are provided on the lower surface side of the bed portion.

  For example, a feed base driving device for a boring machine described in Patent Document 1 is provided with a vertical direction moving means and a horizontal direction moving means in a feed base driving means for moving the feed base, and is fixed to the bed portion of the sewing machine frame. The feed table is moved in the horizontal direction by the horizontal drive motor, while the feed table is moved in the vertical direction by the vertical drive motor fixed to the bed portion of the sewing machine frame. In this case, the lateral direction drive motor and the longitudinal direction drive motor are fixed in an upward posture with the drive shaft facing upward.

  Further, in the sewing machine arm support device described in Patent Document 2, the sewing machine arm portion integrally provided with the bed has a lying posture at the time of sewing with respect to the oil pan fixed to the upper surface of the sewing machine table, and more than that. It can be switched to an upright posture rotated upward. In the case of this sewing machine, although not illustrated, a plurality of electric motors such as a sewing motor that drives a sewing mechanism and a driving motor that drives a needle swing mechanism are provided on the lower surface side of the arm portion.

JP 2000-300080 A (pages 4-6, FIGS. 1-3) Japanese Utility Model Publication No. 60-29992 (pages 2 and 3, FIG. 2)

  In general, an oil tank storing lubricating oil is provided in the arm portion of the sewing machine, and the lubricating oil is lubricated to the driving portion and the sliding portion of each driving mechanism by a light core. Therefore, in the feed base driving device for a boring machine described in Patent Document 1, in order to move the feed base, the horizontal direction drive motor and the vertical direction drive motor have an upward attitude with the drive shaft facing upward. The used lubricating oil is introduced from the arm part to the bed part through the opening, and then drops onto the lateral drive motor and the longitudinal drive motor through the lower surface of the bed part. There is a case.

  In such a case, when the encoder for detecting the drive amount of the drive mechanism by feedback is incorporated in the drive shaft of the electric motor, the seal between the drive shaft and the bearing is sealed. However, the lubricating oil enters the motor through a narrow gap between the drive shaft and its seal member and adheres to the encoder. In particular, when an optical system detection sensor such as a photosensor is employed as the encoder, there is a problem that lubricating oil adheres to the photosensor, the detection operation failure becomes remarkable, and a malfunction occurs in feedback control.

  Similarly, in the support device for the sewing machine arm described in Patent Document 2, the used lubricating oil is introduced from the arm portion into the bed portion through the opening and is suspended from the lower surface of the bed portion. Even when the sewing machine arm does not fall directly on the motor, if the sewing arm is switched from the lying position to the standing position, the lubricating oil hanging on the lower surface of the bed can easily fall onto the drive shaft of the electric motor, and the lubricating oil It is easy to enter the motor through the drive shaft, and as in Patent Document 1 described above, the lubricating oil adheres to the encoder of the drive shaft, causing a detection failure and causing malfunction in feedback control. There is.

The sewing machine according to claim 1 is a sewing machine in which an electric motor including an encoder for driving a drive mechanism is disposed in a bed portion, and a used lubrication from the inside of the pedestal portion is connected to the bed portion. A drain hole for introducing oil into the bed portion is formed in a portion of the bed portion corresponding to the base portion of the pedestal portion connected to either the left half portion or the right half portion in the width direction of the bed portion, An electric motor is arranged in a motor arrangement area provided in either the left half part or the right half part on the opposite side of the drain hole in the bed part, and a first partition that partitions between the drain hole and the motor arrangement area wall is formed in the bed portion, the second partition wall Ru partition between the motor arrangement region and the looper base mounting section, the length of the bed portion, for switching the bed between the horizontal position and the upright position It extends toward the posture switching axis In the formed on the bed, the first, lower end of the second partition wall is formed to be lower than the lower end of the electric motor other than the spindle motor of the electric motor, the first partition wall and the second partition wall A substantially Y-shaped partition wall is formed in plan view, and the posture switching shaft side of the bed portion is located behind the encoder of the electric motor from the joint portion of the first and second partition walls in the Y-shaped partition wall. is there.

  Used lubricant from the inside of the pedestal is formed on the bed portion corresponding to the base of the pedestal connected to either the left half or the right half of the bed in the width direction. It is introduced into the bed portion through the drain hole. However, the electric motor is arranged in the motor arrangement area provided in the other half of the left half or right half of the bed part opposite to the drain hole, and the gap between the drain hole and the motor arrangement area is the first. Because it is partitioned by one partition wall, even if the lubricant introduced into the bed from the drain hole tries to enter the motor placement area, it is absolutely impossible for the first partition wall to block and enter the motor placement area. Not.

  The sewing machine according to claim 2 is the box-shaped partition wall surrounding the drain hole according to claim 1, wherein the box-shaped partition wall having at least a part of the first partition wall is in common with the bed portion. It is formed on the frame.

  The sewing machine according to claim 3 is the sewing machine according to claim 1 or 2, wherein the plurality of electric motors rotationally drive the X and Y motors for driving the feed base in the X direction and the Y direction, respectively, and the needle bar and the looper base. A motor and a spindle motor are included.

  According to the first aspect of the present invention, in the sewing machine in which the base portion of the pedestal portion is connected to the bed portion and the electric motor incorporating the encoder for driving the driving mechanism is disposed in the bed portion, the sewing machine is used from the inside of the pedestal portion. A drain hole for introducing the finished lubricating oil into the bed is formed in the bed portion corresponding to the base of the pedestal connected to either the left half or the right half of the bed in the width direction. The electric motor is arranged in the motor arrangement area provided in either the left half part or the right half part opposite to the drain hole in the bed part, and the drain hole and the motor arrangement area are partitioned. Since one partition wall was formed in the bed part, used lubricating oil was introduced from the inside of the pedestal part into the bed part through a drain hole formed in the part of the bed part corresponding to the base part of the pedestal part. The case is introduced into its bed part Even the lubricating oil tries to penetrate the motor placement area, shielded reliably by the first partition wall, it can be reliably blocked from entering the motor arrangement region of the lubricating oil.

Therefore, even when the electric motor includes an encoder having an optical system detection sensor such as a photosensor, detection failure by the encoder does not occur, and the reliability of feedback control can be improved.
The base of the pedestal is connected to the part from either the left or right side in the width direction of the bed part, and the motor placement area is placed from the other side of the left or right side opposite the drain hole. As a result, the motor placement area moves away from the drain hole, and the used lubricating oil can be made difficult to enter the motor placement area.
Since the second partition wall extending in the length direction of the bed portion partitioning between the motor placement area and the looper base mounting portion is formed in the bed portion, lubricating oil is supplied to the looper base, and the lubricating oil is moved by the operation of the looper. Even when splashed, the scattered lubricating oil can be reliably cut off by the second partition wall, and the blocking effect of the lubricating oil on the motor arrangement region can be enhanced.
Since the first partition wall and the second partition wall form a substantially Y-shaped partition wall in a plan view, the Y-shaped partition wall can double shut off the lubricating oil for the motor arrangement region. The blocking effect can be greatly enhanced. Further, the bending rigidity of the bed portion can be enhanced by the Y-shaped partition wall.

  According to the invention of claim 2, since the box-shaped partition wall surrounding the drain hole and having a common at least part of the first partition wall is formed in the bed portion. Before the lubricating oil introduced into the drain hole reaches the first partition wall, it can be blocked in advance by the box-shaped partition wall.

  That is, the intrusion of the lubricating oil introduced from the drain hole into the bed portion into the motor arrangement region can be double blocked by the box-shaped partition wall and the first partition wall, and the blocking effect against the lubricating oil is remarkably increased. Can be increased. Other effects similar to those of the first aspect can be achieved.

  According to the invention of claim 3, the electric motor includes an X motor and a Y motor for driving the feed base in the X direction and the Y direction, a θ motor for rotationally driving the needle bar and the looper base, and a spindle motor, respectively. Therefore, the intrusion of the lubricating oil into these electric motors can be reliably blocked, and the drive performance and reliability of each of these electric motors can be improved. Other effects similar to those of the first or second aspect are achieved.

  In the sewing machine of this embodiment, a Y-shaped partition wall is formed in the frame of the bed portion, and used lubricating oil introduced from the pedestal portion to the bed portion through the drain hole is blocked by the partition wall, and the motor The electric motor arranged in the arrangement region is prevented from entering the electric motor.

  First, the electronic eyelet hole sewing machine 1 (hereinafter simply referred to as a sewing machine) will be described. As shown in FIG. 1 to FIG. 3, the sewing machine 1 includes a bed base 2 having a substantially rectangular box shape with the upper part opened, a bed part 3 placed so as to be fitted into the bed base 2, and the bed part. 3, a leg post 4 erected from the rear part of the arm 3, an arm part 5 extending forward from the upper part of the leg post 4, and the like, which are placed and fixed on a sewing machine table (not shown).

  As shown in FIG. 3, the arm portion 5 is provided with a main shaft 8 in the front-rear direction, and a hollow (pipe-like) needle bar 7 having a sewing needle 6 attached to the lower end is attached to the front end portion of the arm portion 5. The main shaft 8 is provided so that it can be moved up and down via a needle bar up-and-down moving mechanism (not shown). The needle bar 7 is further adjusted to the rotation of the main shaft 8 and left and right to a left swing position (inner needle position) and a right swing position (outer needle position) by a predetermined width by a needle swing mechanism (not shown). It can swing.

  As shown in FIG. 7, the bed portion 3 is connected to the bed table 2 so as to be switched from a normal horizontal posture to a standing posture in preparation for maintenance. As shown in FIGS. 1 to 3, on the upper surface portion of the bed portion 3, a feed base 9 on which a work cloth used for eyelet stitching is set in the X direction (left and right direction) and the Y direction (front and back direction). Each is provided to be movable.

  Although not shown, a looper base having a looper driving mechanism having a pair of left and right loopers (not shown) is provided on the lower surface side of the front end side of the bed portion 3 so as to face the needle bar 7. A looper base mounting portion (mounting hole) Fa for mounting the looper base is provided on the frame F closer to the front of the bed portion 3.

  By the way, although not shown in the drawings, an oil tank in which lubricating oil is stored is provided in the arm portion 5, and the lubricating oil is provided in a looper driving mechanism and a plurality of driving mechanisms (to be described later) via a wick. Oil is also supplied to each of the rotating part and the sliding part.

Next, the bed part structure 10 will be described.
As shown in FIGS. 4 to 6, the frame F of the bed portion 3 has a rectangular shape when viewed from the bottom, and the base portion 4 a of the pedestal portion 4 is provided with a plurality of fixing bolts 11 near the left side portion in the width direction of the bed portion 3. It is connected by. Accordingly, the drain holes Fb and Fc for introducing the used lubricating oil supplied to the plurality of rotating parts and sliding parts via the light core and collected from the inside of the leg part 4 into the bed part 3 are provided on the leg part 4. It is formed in the part of the bed part 3 corresponding to the base part 4a.

  A motor arrangement area ME (shown by a one-dot chain line in FIG. 6) is provided on the opposite side of the drain hole Fb, Fc of the bed 3, that is, inside the portion near the right side on the rear end side. The main shaft motor 13, the Y motor 14 that moves the feed base 9 in the Y direction (front-rear direction), the θ motor 15 that integrally rotates the needle bar 7 and the looper base, and the feed base 9 in the X direction ( The X motor 16 to be moved in the left and right direction is compactly arranged and fixed in this order from the rear side.

  Therefore, the arm portion 5 and the pedestal portion 4 include an X-direction moving mechanism (not shown) for moving the feed base 9 in the X direction by driving the X motor 16, and the feed base 9 driven by the Y motor 14. A Y-direction moving mechanism (not shown) for moving in the direction and a rotation drive mechanism (not shown) for rotating the needle bar 7 and the looper base by the θ motor 15 are provided.

  A spindle motor 13 incorporating an encoder 13 a having a photosensor is disposed rearward, and a timing pulley 17 is fixed to a drive shaft of the spindle motor 13. Therefore, the timing belt 18 is hooked over the timing pulley 17 and the driven pulley 19 fixed to the rear end portion of the main shaft 8, and the main shaft 8 is driven to rotate by driving the main shaft motor 13.

  A Y motor 14 incorporating an encoder 14a having a photosensor is disposed on the left side and drives a Y-direction moving mechanism. A θ motor 15 incorporating an encoder 15a having a photosensor is disposed upward and drives a rotation drive mechanism. Further, an X motor 16 incorporating an encoder 16a having a photosensor is disposed forward and drives an X-direction moving mechanism.

  By the way, the 1st partition wall 20 which partitions off between the drain holes Fb and Fc and the motor arrangement | positioning area | region ME is formed in the flame | frame F of the bed part 3, and the box-shaped partition wall 21 which surrounds the circumference | surroundings of the drain holes Fb and Fc And the box-shaped partition wall 21 which has a part of 1st partition wall 20 in common is formed in the flame | frame F of the bed part 3. FIG. Further, a second partition wall 22 that partitions between the looper base mounting portion Fa and the motor placement region ME is formed on the frame F of the bed portion 3.

  That is, as shown in FIG. 6, the first partition wall 20 extends forward to the left side of the looper base mounting portion Fa so as to follow the base portion 4 a of the pedestal portion 4. The second partition wall 22 extends forward from the vicinity of the rear end of the first partition wall 20 to the right side of the looper base mounting portion Fa along the motor placement region ME. The first partition wall 20 and the second partition wall 22 form a substantially inverted Y-shaped partition wall in plan view extending in the length direction (front-rear direction) of the bed portion 3.

  The lower ends of the first and second partition walls 20 and 22 are lower than the lower ends of the box-shaped partition walls 21 and lower than the lower ends of electric motors such as the Y motor 14 and the X motor 16 excluding the spindle motor 13. It is the vertical wall which has the predetermined height formed so that it may become. Therefore, the bending rigidity of the bed portion 3 is enhanced by the substantially Y-shaped first and second partition walls 20 and 22 in this way.

  Next, the operation and effect of the bed part structure 10 of the electronic eyelet hole sewing machine 1 configured as described above will be described.

  The base portion 4a of the pedestal column portion 4 is connected to the left side portion of the bed portion 3 in the width direction, and a plurality of encoder-equipped electric motors 13 to 16 for driving the plurality of drive mechanisms are arranged in the bed portion 3. In this case, drain holes Fb and Fc for introducing the used lubricating oil into the bed portion 3 from the inside of the pedestal portion 4 are formed in a portion of the bed portion 3 corresponding to the base portion 4a of the pedestal portion 4. A plurality of electric motors 13 to 16 are arranged in the motor arrangement area ME on the opposite side of the drain holes Fb and Fc, that is, in the portion near the right side on the rear end side, and the drain holes Fb and Fc and the motor arrangement area ME are arranged. Since the first partition wall 20 is formed on the frame F of the bed portion 3, the used lubricating oil from the inside of the pedestal portion 4 is part of the bed portion 3 corresponding to the base portion 4 a of the pedestal portion 4. Through drain holes Fb and Fc formed in When the lubricating oil introduced into the bed 3 is about to enter the motor arrangement area ME, it is reliably blocked by the first partition wall 20 and the motor arrangement area of the lubricating oil is introduced. Intrusion to the ME can be reliably blocked.

  For this reason, these spindle motors 13, Y motors 14, θ motors 15, X motors 16 and the like have built-in encoders 13a-16a having photosensors, and the bed 3 is shown in FIG. Even when the bed 3 is switched to the standing posture as shown in FIG. 4, even when the encoder 16a is positioned below the motor body as in the case of the X motor 16, lubrication is possible. Oil does not enter these encoders 16a, detection failure by the encoder 16a does not occur, and the reliability of feedback control can be improved.

  Further, a box-shaped partition wall 21 that surrounds the drain holes Fb and Fc and has a common at least part of the first partition wall 20 is formed in the frame F of the bed portion 3. Therefore, before the lubricating oil introduced into the drain holes Fb and Fc reaches the first partition wall 20, it can be blocked in advance by the box-shaped partition wall 21. In other words, the penetration of the lubricating oil introduced into the bed 3 from the drain holes Fb and Fc into the motor arrangement area ME can be blocked by the box-shaped partition wall 21 and the first partition wall 20 in a double manner. The oil blocking effect can be greatly enhanced.

  A looper base mounting portion Fa on which the looper base is disposed is provided on the bed portion 3, and a second partition wall 22 that partitions between the looper base mounting portion Fa and the motor placement region ME is formed on the frame F of the bed portion 3. Therefore, even when the lubricating oil is supplied to the looper base and the lubricating oil is scattered around by the operation of the looper, the scattered lubricating oil can be surely blocked by the second partition wall 22, and the motor arrangement area The effect of blocking lubricating oil on ME can be enhanced.

  In addition, since the first partition wall 20 and the second partition wall 22 form a substantially Y-shaped partition wall in plan view extending in the length direction of the bed portion 3, the Y-shaped first and second partition walls 20. , 22 can remarkably enhance the blocking effect of the lubricating oil on the motor arrangement region ME.

  A plurality of electric motors 13 to 16 include an X motor 16 and a Y motor 14 that drive the feed base 9 in the X direction and the Y direction, a θ motor 15 that rotationally drives the needle bar 7 and the looper base, and a spindle motor. 13 is included, the intrusion of the lubricating oil into the plurality of electric motors 13 to 16 can be reliably blocked, and the drive performance and reliability of each of the electric motors 13 to 16 can be improved.

  Furthermore, since the substantially Y-shaped first and second partition walls 20 and 22 are formed on the frame F of the bed portion 3, the bending rigidity of the bed portion 3 can be enhanced.

Next, a modified embodiment in which the embodiment is partially modified will be described.
1] The first partition wall 20 and the second partition wall 22 may be formed independently so as to extend independently in the front-rear direction without crossing each other.

2] The base part 4a of the pedestal part 4 is connected to a part from the right side part in the width direction of the bed part 3, and the motor arrangement area ME is arranged to a part from the left side part in the width direction of the bed part 3 Also good.

3] The present invention is not limited to the embodiment described above, and those skilled in the art can implement the present invention by adding various modifications without departing from the spirit of the present invention. The present invention includes such modifications.

1 is a perspective view of an electronic eyelet hole sewing machine according to an embodiment of the present invention. It is a front view of an electronic eyelet hole sewing machine. It is a right view of an electronic eyelet hole sewing machine. It is a perspective view from the lower right side of a bed part. It is a perspective view from the left diagonal lower part of a bed part. It is a bottom view of a bed part. FIG. 4 is a view corresponding to FIG. 3 switched to a standing posture.

DESCRIPTION OF SYMBOLS 1 Electronic eyelet hole sewing machine 3 Bed part 4 Leg column part 10 Bed part structure 13 Main shaft motor 14 Y motor 15 θ motor 16 X motor 20 First partition wall 21 Box-shaped partition wall 22 Second partition wall ME Motor arrangement area F Frame Fb Drain hole Fc Drain hole

Claims (3)

In the sewing machine in which the base part of the pedestal part is connected to the bed part and an electric motor incorporating an encoder for driving the drive mechanism is arranged in the bed part,
A drain hole for introducing used lubricating oil into the bed portion from the inside of the pedestal portion is connected to either the left half portion or the right half portion in the width direction of the bed portion at the base portion of the pedestal portion. Formed on the corresponding bed part,
The electric motor is arranged in a motor arrangement region provided in the other half portion of the left half or right half opposite to the drain hole in the bed part,
A first partition wall that partitions between the drain hole and the motor arrangement region is formed in the bed portion,
The motor placement region and the second partition wall Ru partition between the looper base mounting portion, in a longitudinal direction of the bed, toward the posture switching shaft for switching between a standing posture the bed a horizontal posture Formed in the bed part to extend
The lower ends of the first and second partition walls are formed to be lower than the lower ends of the electric motors other than the main shaft motor of the electric motors,
The first partition wall and the second partition wall form a substantially Y-shaped partition wall in plan view, and the posture switching of the bed portion is performed from a joint portion of the first and second partition walls in the Y-shaped partition wall. A sewing machine characterized in that the shaft side is located behind the encoder.   2. A box-shaped partition wall surrounding the drain hole, the box-shaped partition wall having at least a part of the first partition wall in common is formed in the bed portion. The sewing machine according to 1. The electric motor includes an X motor and a Y motor for driving the feed base in the X direction and the Y direction, a θ motor for rotationally driving the needle bar and the looper base, and a spindle motor, respectively. 2. The sewing machine according to 2.

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