JP2006198163A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To open and close an adjusting hole by simply holding an opening and closing cover of the adjusting hole without falling out. <P>SOLUTION: A needle bar rod is connected to a rotatable crank in a vertically movable state, and a needle bar holder is connected to the needle bar rod. Moreover, a needle bar is fixed to the needle bar holder through a fixing screw, and the adjusting hole 12a is formed at a head cover 12 opposing the fixing screw for fixing the needle bar. Then, an opening and closing cover 16 of the adjusting hole 12a is provided rotatably at the head cover 12. Consequently, the adjusting hole 12a can be opened and closed by rotating the opening and closing cover 16 around a pivotally supporting part. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a sewing machine, and more particularly to a sewing machine including an opening / closing lid that opens and closes an adjustment hole of a set screw for fixing a needle bar to a needle bar holder.

  Conventionally, as shown in FIG. 3, a sewing machine 1, for example, a flat stitch sewing machine, has an upper shaft 3 rotatably connected to a driving mechanism (not shown) on a sewing machine arm 2. The crank 4 is fixed. A needle bar rod 5 is rotatably supported on the crank 4 at a position eccentric from the rotation center of the crank 4, and a needle bar holder 6 is rotatable relative to the needle bar rod 5 at the tip of the needle bar rod 5. Is pivotally supported. Further, the needle bar 7 is inserted into the insertion hole of the needle bar holder 6, and an intermediate portion of the needle bar holder 6 is fixed to the needle bar holder 6 by a set screw 8 while protruding downward from the lower surface of the sewing machine arm 2. . Further, a needle stopper 9 is screwed into the lower end portion of the needle bar 7, and a plurality of needles 10 are fixed to the needle stopper 9 with a needle fixing screw 11.

  Although not shown in detail, the needle plate mounted horizontally on the sewing machine bed has a needle drop hole, and the needle 10 described above is opposed to the needle drop hole of the needle plate. It is positioned. A looper is pivotally supported below the needle plate so as to be swingable in the left-right direction.

  In such a sewing machine 1, when the crank 4 rotates via the upper shaft 3, the needle bar rod 5 reciprocates up and down, and the needle bar 7, that is, the needle 10 moves vertically through the needle bar holder 6. Move back and forth. At this time, the needle 10 is inserted into a needle drop hole of a needle plate (not shown), and a looper (not shown) swings in the left-right direction in synchronization with the vertical reciprocation of the needle 10.

  Here, when the needle thread is inserted into each needle 10 and the looper thread is inserted into the looper, when the needle 10 is raised, a needle thread loop is formed in each needle 10 and the looper is connected to all the needles. The needle thread loop is sewn by swinging so as to scoop the thread loop and capturing the needle thread loop.

  By the way, if the positions of the needle 10 and the looper are deviated, the needle thread loop cannot be captured and a sewing defect called skipping occurs. For this reason, it is necessary to adjust so that the needle | hook 10 may penetrate the center of the needle drop hole of a throat plate correctly.

  Therefore, the head cover 12 is fixed to the front end surface of the sewing machine arm 2 with a plurality of screws, and the head cover 12 has an adjustment hole 12a facing the set screw 8 for fixing the needle bar 7 to the needle bar holder 6. Is formed. The adjustment hole 12a of the head cover 12 is normally closed by a rubber plug 13.

Therefore, when adjusting the needle 10, after removing the plug 13, a screwdriver is inserted through the adjustment hole 12 a, the set screw 8 is loosened, the needle bar 7 is rotated around the axis, and the needle 10 is dropped on the needle plate. Adjust so that the center of the hole is inserted accurately. The height position of the needle 10 is also adjusted by moving the needle bar 7 up and down in the axial direction with the set screw 8 loosened. When the adjustment of the needle 10 is completed, the set screw 8 is tightened to fix the needle bar 7, and the plug 13 is pushed into the adjustment hole 12a and closed (see, for example, Patent Document 1).
JP 2003-38881 A

  As described above, the adjustment hole formed in the head cover is normally closed by a rubber plug. In other words, if the adjustment hole is open, dust and the like will enter the sewing machine arm through the adjustment hole and accumulate, and will absorb excess lubricant and leak from the needle bar insertion hole formed in the sewing machine arm. This is because the fabric being sewn may be soiled.

  However, if the plug is deteriorated and hardened due to aging, the plug may easily fall off from the adjustment hole and be lost when the outer peripheral surface of the sewing machine is wiped. Further, when the plug is removed when adjusting the needle bar, the plug may be lost. In this way, if the plug is lost, the adjustment hole remains open, and there is a risk of causing problems such as leakage of the lubricating oil as described above.

  It is also known that a female screw is formed in the adjustment hole and a screw is screwed into the adjustment hole to close the adjustment hole. However, a screwdriver is required to open the adjustment hole, and the work is complicated. If the screw is lost, the same situation will be caused.

  The present invention has been made in view of such problems, and provides a sewing machine that can open and close the adjustment hole while holding the opening / closing lid of the adjustment hole without easily dropping off.

  According to the present invention, a needle bar rod is connected to a rotatable crank so as to be movable up and down, a needle bar holder is connected to the needle bar rod, and the needle bar is fixed to the needle bar holder via a set screw. In a sewing machine in which an adjustment hole is formed in the head cover or the sewing machine arm so as to face the set screw that fixes the needle bar, an opening / closing lid that opens and closes the adjustment hole is provided on the head cover or the sewing machine arm so as to be rotatable or slidable. It is characterized by being.

  According to the present invention, the adjustment hole formed in the head cover or the sewing machine arm can be opened and closed by rotating or sliding the opening / closing lid with respect to the head cover or the sewing machine arm.

  Therefore, the opening / closing lid can be held without being easily removed from the head cover or the sewing machine arm, and the opening / closing lid can be reliably prevented from being lost and the adjustment hole remaining open. It is possible to prevent the occurrence of the accompanying problems.

  Here, by providing a stopper or the like at the rotation stroke end or sliding stroke end, the rotation range or sliding range of the opening / closing lid can be regulated.

  In the present invention, the opening / closing lid is pivotally supported by the head cover or the sewing machine arm, and a substantially fan-shaped recess is formed in the head cover or the sewing machine arm over the rotation range of the opening / closing lid. When the adjustment hole is closed by the opening / closing lid when it is in the position to be locked with the surface, after the adjustment of the needle is completed, the opening / closing lid is moved around the shaft support until it is locked to the peripheral surface of the substantially fan-shaped recess. By rotating, the adjustment hole can be reliably closed, and dust and the like can be prevented from entering through the adjustment hole.

  In this case, if the opening / closing lid is pivotally supported by its own weight, the opening / closing lid is engaged with the peripheral surface of the substantially fan-shaped recess by its own weight by releasing the finger from the opening / closing lid at the position where the adjustment hole is opened. It will rotate until it stops, and it will definitely return to the position where the adjustment hole is closed. Therefore, it is possible to reliably prevent the adjustment hole from being left open by forgetting the operation of closing the adjustment hole with the opening / closing lid.

  In the present invention, it is preferable that a handle is formed on the opening / closing lid, because the opening / closing lid can be rotated or slid by applying a fingertip to the handle.

  According to the present invention, the adjustment hole can be opened and closed by holding the opening / closing lid of the adjustment hole without easily dropping off.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  1 and 2 show an embodiment of the sewing machine 1 of the present invention.

  1 and 2, the mechanism for reciprocating the needle 10 described above in the vertical direction is omitted. For this reason, about the reciprocation mechanism of the needle | hook 10, the code | symbol of the member shown in FIG. 3 shall be used as it is.

  1 and 2, the head cover 12 is fixed to the front end surface of the sewing machine arm 2 via a packing 14 via a plurality of screws 15. The head cover 12 is formed with an adjustment hole 12a facing the set screw 8 for fixing the needle bar 7 to the needle bar holder 6, and at a certain distance from the adjustment hole 12a in the forward direction. A mounting hole 12b in which a female screw is formed is formed. Further, a substantially fan-shaped recess 12x including the adjustment hole 12a and the mounting hole 12b described above is formed on the surface of the head cover 12. The recess 12x has an inferior arc whose radius is a length from the center of the mounting hole 12b to a position slightly beyond the adjustment hole 12a, and has a central angle at which the adjustment hole 12a can be opened and closed by the opening / closing lid 16 described later. Yes.

  On the other hand, an opening / closing lid 16 is disposed in the recess 12 x of the head cover 12. The opening / closing lid 16 is made of a thin plate material, the width of the distal end portion is set larger than the diameter of the adjustment hole 12a, and the length from the center of the hole 16a formed in the proximal end portion of the opening / closing lid 16 to the distal end edge. Is set to be slightly smaller than the radius of the substantially fan-shaped concave portion 12x of the head cover 12, and a handle 161 is bent at the upper edge. Then, by screwing the screw 17 into the mounting hole 12 b through the washer 18 and the hole 16 a of the opening / closing lid 16, the opening / closing lid 16 is pivotally supported around the screw 17.

  Here, when the opening / closing lid 16 is rotated around the screw 17 and its lower end edge is brought into contact with and latched on the peripheral surface of the substantially fan-shaped recess 12x, the opening / closing lid 16 is positioned to close the adjustment hole 12a. (Refer to the solid line state in FIG. 2).

  Next, the adjustment operation of the needle 10 in the sewing machine 1 configured as described above will be described.

  First, a finger is applied to the handle 161 of the opening / closing lid 16, the opening / closing lid 16 is pushed up and rotated around the screw 17 to open the adjustment hole 12a. At this time, the opening / closing lid 16 is held at a position where the adjustment hole 12 a is opened by friction with the head cover 12. Next, a screwdriver is inserted through the adjustment hole 12a, the set screw 8 is loosened, the needle bar 7 is rotated about its axis, and the needle 10 is adjusted so as to accurately pass through the center of the needle drop hole of the needle plate. 7 is moved up and down in the axial direction to adjust the height position of the needle 10. When the adjustment of the needle 10 is completed, the set screw 8 is tightened to fix the needle bar 7, and then the finger is placed on the handle 161 of the opening / closing lid 16 to push down the opening / closing lid 16 to contact the peripheral surface of the recess 12x. The adjustment hole 12a can be closed by the opening / closing lid 16 by rotating around the screw 17 until it is locked.

  As a result, it is possible to reliably prevent the opening / closing lid 16 from being lost and the adjustment hole 12a from being left open, and dust or the like may enter through the adjustment hole left open, causing a problem. Can be prevented.

  Here, by adjusting the screwed state of the screw 17 to the mounting hole 12b, a gap is formed between the front surface of the recess 12x of the head cover 12 and the back surface of the opening / closing lid 16, and the opening / closing lid 16 is rotated around the screw 17 by its own weight. Can be pivotally supported. When the opening / closing lid 16 is pivotally supported by its own weight, the opening / closing lid 16 is engaged with the peripheral surface of the substantially fan-shaped recess 12x by its own weight when the finger is released from the opening / closing lid 16 at the position where the adjustment hole 12a is opened. It rotates until it stops, and surely returns to the position where the adjustment hole 12a is closed. Therefore, it is possible to reliably prevent the adjustment hole 12a from being left open by forgetting the operation of the opening / closing lid 16 that closes the adjustment hole 12a.

  By the way, in embodiment mentioned above, the adjustment hole 12a was formed in the head cover 12 of a flat stitch sewing machine, and the case where the opening / closing lid 16 was pivotally supported by the head cover 12 and opened and closed was illustrated. However, an adjustment hole can be formed in the sewing machine arm 2. In this case, an opening / closing lid that opens and closes the adjustment hole may be pivotally supported on the sewing machine arm 2.

  Instead of pivotally supporting the opening / closing lid, the opening / closing lid may be provided slidably to open / close the adjustment hole. For example, the adjustment hole may be opened and closed by forming a pair of guide rails facing each other across the adjustment hole in the head cover or the sewing machine arm in the vertical direction or the horizontal direction, and fitting an opening / closing lid on the guide rail. In this case, a stopper may be provided at the stroke end to prevent the opening / closing lid from coming off.

  Furthermore, the sewing machine is not limited to a flat stitch sewing machine, but can be applied to various sewing machines such as an overlock sewing machine in which a needle bar is fixed to a needle bar holder with a set screw and an adjustment hole is formed in a cover or the like facing the set screw. it can.

  As described above, according to the present invention, it is possible to reliably prevent the opening / closing lid from being lost and the adjustment hole from being left open. Can be prevented, so that the sewing operation can be performed smoothly.

It is a disassembled perspective view which shows one Embodiment of the sewing machine of this invention. It is the front view which shows the head cover of the sewing machine of FIG. 1, AA sectional view, and BB sectional drawing. It is a disassembled perspective view explaining the principal part of the conventional sewing machine.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewing machine 2 Sewing machine arm 4 Crank 5 Needle bar rod 6 Needle bar holding 7 Needle bar 8 Set screw 10 Needle 12 Head cover 12a Adjustment hole 12b Mounting hole 12x Recess of substantially fan shape 16 Opening / closing lid 161 Handle

Claims (3)

  The needle bar rod is connected to the rotatable crank so as to be movable up and down, and the needle bar holder is connected to the needle bar rod, and the needle bar is fixed to the needle bar holder via a set screw. In a sewing machine in which an adjustment hole is formed in the head cover or the sewing machine arm so as to face the set screw to be fixed, an opening / closing lid for opening and closing the adjustment hole is provided on the head cover or the sewing machine arm so as to be rotatable or slidable. A sewing machine characterized by   The opening / closing lid is pivotally supported by the head cover or the sewing machine arm, and a substantially fan-shaped recess is formed in the head cover or the sewing machine arm over the rotation range of the opening / closing lid, and the opening / closing lid is engaged with the peripheral surface of the recess. 2. The sewing machine according to claim 1, wherein the adjustment hole is closed by an opening / closing lid when in the position to be closed. The sewing machine according to claim 1, wherein a handle is formed on the opening / closing lid.

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