JP2008018001A - Sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sewing machine in which the workability of shuttle matching work is improved. <P>SOLUTION: The sewing machine 1 comprises needles 8 and 9 to be vertically moved along one axis, horizontal hooks 10 and 11 provided inside a sewing machine bed 41 and rotated by a hook shaft to cooperate with the needles 8 and 9 and form stitches; a hook shaft base for supporting the horizontal hooks 10 and 11 to freely adjust the arrangement positions of the horizontal hooks 10 and 11; and a cover members 30 and 31 covering the upper part of the horizontal hooks 10 and 11 and freely detachably supported by the sewing machine bed 41. In the sewing machine 1, optical system lenses 33 and 34 provided on the cover members 30 and 31 and a clamp member 51 fixed to a sewing machine frame 4 and capable of holding the cover members 30 and 31 are provided. The clamp member 51 is arranged such that an operator can view the enlarged image of the needles 8 and 9 and the horizontal hooks 10 and 11 by the optical system lenses 33 and 34 when holding the cover members 30 and 31. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sewing machine including a horizontal shuttle.

A two-needle sewing machine is known as a sewing machine for simultaneously forming two parallel seams. In this two-needle sewing machine, a pair of left and right needles attached to the needle bar move up and down by the rotation of the sewing machine upper shaft. On the other hand, in synchronization with the vertical movement of the needle, a pair of left and right horizontal hooks supported in the sewing machine bed rotate around the hook shaft. The rotation of each horizontal hook is performed by the rotation of the lower shaft of the sewing machine interlocked with the upper shaft of the sewing machine (see, for example, Patent Document 1). By the vertical movement of the needle and the rotation of the horizontal hook, the upper thread inserted through the needle hole of the needle is entangled with the lower thread of the bobbin stored in the horizontal hook to form a seam.
The interval between the two needles can be adjusted. When the interval between the needles is adjusted, it is necessary to adjust the arrangement position of each horizontal hook according to the needle, and this operation is called hook adjustment. As shown in FIG. 9, the hooks are brought close to each other so that a slight gap is formed so that the sword tip 101 of the horizontal hook does not contact the needle 102 (for example, a gap t = about 0.01 mm to 0.05 mm). The reason why the horizontal hook is disposed at such a position is that if the sword 101 is separated from the needle 102 too much, the upper thread inserted through the needle 102 cannot be caught by the sword 101.
Therefore, when the hooks are aligned, the adjustment of the distance between the needle 102 and the sword tip 101 of the horizontal hook has a great influence on the subsequent sewing, and therefore requires careful and accurate work.
JP-A-8-187384

  However, since the hook alignment work is often performed in a factory where sewing is performed, it is necessary to work in an environment where the lighting is not sufficiently applied to the vicinity of the horizontal hook and with other parts such as feed dogs attached. In other words, it was difficult to perform the pot alignment work.

  Accordingly, the present invention has been made to solve the above-described problems, and an object of the present invention is to provide a sewing machine that can improve the workability of the hook alignment work.

  According to the first aspect of the present invention, a needle that moves up and down along one axis, a horizontal hook that is provided inside a sewing machine bed, rotates by a hook shaft, and forms a seam in cooperation with the needle, and the horizontal A sewing machine comprising: a shuttle shaft base that supports the shuttle and adjusts an arrangement position of the horizontal shuttle; and a covering member that covers an upper portion of the horizontal shuttle and is detachably supported by the sewing machine bed. An optical system lens provided on the covering member, and a clamp member fixed to a sewing machine frame and capable of gripping the covering member. When the clamp member grips the covering member, an operator can The lens is arranged so that an enlarged image of the needle and the horizontal shuttle is visible.

According to the first aspect of the present invention, when adjusting the position of the horizontal shuttle relative to the needle (so-called hook alignment), the operator attaches the optical lens to the clamp member fixed to the sewing machine frame. The provided covering member is gripped. At this time, the clamp member is arranged so that the operator can visually recognize an enlarged image of the needle and the horizontal hook by the optical lens when the clamp member grips the cover member. It is possible to work while looking at the needle and the horizontal hook through the optical lens of the covering member only by holding the member by the clamp member. This makes it easier for the operator to visually recognize the gap between the needle and the horizontal hook, improving workability. Therefore, even if the surrounding environment (the lighting is not sufficiently applied to the extent necessary for the hook alignment, or other parts are present in the vicinity), the workability of the hook alignment operation can be improved.
In addition, the operator can work while looking at the needle and the horizontal hook through the optical system lens with the covering member held by the clamp member, so that the operator does not need to hold the covering member and both hands are free. Thus, the hook alignment operation can be performed with both hands, so that the workability can be improved.

According to the first aspect of the present invention, the operator can work while looking at the needle and the horizontal hook through the optical lens of the covering member only by holding the covering member by the clamp member. This makes it easier for the operator to visually recognize the gap between the needle and the horizontal hook, improving workability. Therefore, even if the surrounding environment (the lighting is not sufficiently applied to the extent necessary for the hook alignment, or other parts are present in the vicinity), the workability of the hook alignment operation can be improved.
In addition, the operator can work while looking at the needle and the horizontal hook through the optical system lens with the covering member held by the clamp member, so that the operator does not need to hold the covering member and both hands are free. Thus, the hook alignment operation can be performed with both hands, so that the workability can be improved.

Hereinafter, the best mode of the sewing machine will be described in detail with reference to the drawings.
<Configuration of sewing machine>
As shown in FIG. 1, the sewing machine 1 includes a sewing machine table 3 supported by the upper ends of a plurality of legs 2, a sewing machine frame 4 formed in a substantially U shape in front view, and provided on the sewing machine table 3. It has.
A sewing machine motor 5 serving as a drive source for sewing by the sewing machine 1 is provided below the sewing machine table 3. The sewing machine motor 5 is connected to an upper shaft (not shown) and a lower shaft 20 (see FIG. 3) provided in the sewing machine frame 4 via a belt.
Two needle bars 6, 7 that move up and down in synchronization with the rotation of the upper shaft are connected to the upper shaft, and needles 8, 9 through which the upper thread is inserted into the needle bars 6, 7 are the upper and lower sides of the sewing machine 1. Each is provided on one axis along the direction. Therefore, when the sewing machine motor 5 is driven, the drive is transmitted from the upper shaft to the needles 8 and 9 via the belt, and the needles 8 and 9 move up and down. Here, the needles 8 and 9 are provided side by side in the left-right direction (X direction in FIG. 1) toward the front of the sewing machine 1.

Two horizontal hooks 10 and 11 (see FIG. 3) that rotate in synchronization with the rotation of the lower shaft 20 are connected to the lower shaft 20. Accordingly, when the sewing machine motor 5 is driven, the drive is transmitted from the lower shaft 20 to the horizontal hooks 10 and 11 via the belt, and the horizontal hooks 10 and 11 cooperate with the needles 8 and 9 to move the hook shaft 10b, It rotates around 11b (described later).
A control device 12 that controls driving of the sewing machine motor 5 is electrically connected to the sewing machine motor 5. An operation pedal 13 that transmits a drive instruction input signal to the sewing machine 1 to the control device 12 is electrically connected to the control device 12.
A power switch 14 is provided at the bottom of the sewing machine table 3 to turn on / off the power of the sewing machine frame 4 when pressed.

As shown in FIGS. 2 and 3, an opening is formed in the upper surface of the sewing machine table 3, and a sewing machine bed 41 located in the lower part of the sewing machine frame 4 is accommodated in this opening. An opening 41a is formed on the upper surface of the sewing machine bed 41, and horizontal shuttles 10, 11 and a feed dog 15 are provided inside the opening 41a.
The horizontal hook 10 has a small gap (for example, about 0.01 mm to 0.05 mm) between the side surface of the needle 8 and the sword tip 10a of the horizontal hook 10 when the needle 8 is lowered. It is placed close to the vertical movement path. The horizontal hook 11 has a small gap (for example, about 0.01 mm to 0.05 mm) between the side surface of the needle 9 and the sword tip 11a of the horizontal hook 11 when the needle 9 is lowered. It is placed close to the vertical movement path.

  The horizontal hook 10 has a hook shaft 10b extending in the vertical direction of the sewing machine 1, that is, the vertical movement direction of the needle 8, and a screw gear having a thread groove formed on the outer periphery near the center of the hook shaft 10b. 21 is provided. The screw gear 21 is provided on the same axis as the shuttle shaft 10b, and is fixed to the shuttle shaft 10b by a set screw 21b. The screw gear 21 is meshed with a screw gear 22 provided on the lower shaft 20. The screw gear 22 is provided on the same axis as the lower shaft 20, and is fixed to the lower shaft 20 by a set screw 22b.

  As a result, when the lower shaft 20 rotates about the axis by driving the sewing machine motor 5, the screw gear 22 also rotates about the axis in synchronization with the rotation of the lower shaft 20. The rotation of the screw gear 22 transmits the rotation to the screw gear 21, and the screw gear 21 rotates around the axis. As the screw gear 21 rotates, the hook shaft 10b fixed to the screw gear 21 rotates about the axis, and the horizontal hook 10 rotates about the hook shaft 10b.

  As shown in FIGS. 3 and 4, the shaft portion of the hook shaft 10b is inserted into a hook shaft base 23 that supports the hook shaft 10b, and the hook shaft base 23 is configured so that the hook shaft 10b can rotate. The shaft 10b is supported. In other words, the hook shaft base 23 serves as a bearing for the hook shaft 10b. As shown in FIGS. 3 and 5, the shuttle shaft base 23 is attached to the sewing machine bed 41 with screws 23 a and 23 b. A slot 23c extending along the longitudinal direction of the lower shaft 20 when attached to the sewing machine bed 41 is formed in a portion of the shuttle shaft base 23 where the screw 23a is inserted. This is to loosen the screws 23 a and 23 b and move the shuttle shaft base 23 along the longitudinal direction of the lower shaft 20. This is because the arrangement position of the horizontal hook 10 can be adjusted by moving the hook shaft base 23 and the distance between the horizontal hooks 10 and 11 is adjusted.

  The horizontal hook 11 has a hook shaft 11b extending along the vertical direction of the sewing machine 1, that is, the vertical movement direction of the needle 9, and a screw gear having a thread groove formed on the outer periphery near the center of the hook shaft 11b. 23 is provided. The screw gear 23 is provided on the same axis as the shuttle shaft 11b, and is fixed to the shuttle shaft 11b by a set screw 23b. The screw gear 23 is meshed with a screw gear 24 provided on the lower shaft 20. The screw gear 24 is provided on the same axis as the lower shaft 20, and is fixed to the lower shaft 20 by a set screw 24b.

  Thus, when the lower shaft 20 rotates about the axis by driving the sewing machine motor 5, the screw gear 24 also rotates about the axis in synchronization with the rotation of the lower shaft 20. As the screw gear 24 rotates, the rotation is transmitted to the screw gear 23, and the screw gear 23 rotates around the axis. As the screw gear 23 rotates, the hook shaft 11b fixed to the screw gear 23 rotates about the axis, and the horizontal hook 11 rotates about the hook shaft 11b.

As shown in FIGS. 3 and 4, the shaft portion of the hook shaft 11b is inserted into a hook shaft base 25 that supports the hook shaft 11b, and the hook shaft base 25 is configured so that the hook shaft 11b can rotate. The shaft 11b is supported. In other words, the hook shaft base 25 serves as a bearing for the hook shaft 11b. As shown in FIGS. 3 and 5, the shuttle shaft base 25 is attached to the sewing machine bed 41 with screws 25 a and 25 b. A long hole 25c extending along the longitudinal direction of the lower shaft 20 when attached to the sewing machine bed 41 is formed in a portion of the shuttle shaft base 25 where the screw 25a is inserted. This is because the screws 25 a and 25 b are loosened to move the shuttle shaft base 25 along the longitudinal direction of the lower shaft 20. This is because the arrangement position of the horizontal hook 11 can be adjusted by moving the hook shaft base 25 and the distance between the horizontal hooks 10 and 11 is adjusted.
The horizontal hooks 10 and 11 are provided side by side along the longitudinal direction (axial direction) of the lower shaft 20, and the hook shafts 23 and 25 are also arranged along the longitudinal direction (axial direction) of the lower shaft 20. Is provided.

As shown in FIGS. 2 and 6, above the horizontal hooks 10 and 11, sliding plates 30 and 31 are provided as covering members that cover the horizontal hooks 10 and 11 and are detachably supported by the sewing machine bed 41. It has been.
The sliding plate 30 is provided so as to cover the upper side of the horizontal hook 10, and the sliding plate 31 is provided so as to cover the upper side of the horizontal hook 11. The sliding plate 30 and the sliding plate 31 are provided so as to face each other with a needle plate 32 provided below the needles 8 and 9 interposed therebetween.

The sliding plate 30 or the sliding plate 31 is formed so as to be gripped by a clamp member 51 fixed to the sewing machine frame 4. In the following description, an example in which the sliding plate 30 is gripped by the clamp member 51 will be described. It goes without saying that the sliding plate 31 may be gripped by the clamp member 51 instead of the sliding plate 30.
As shown in FIGS. 7 and 8, the clamp member 51 is fixed to the front side facing the operator of the sewing machine frame 4 with a fastening member such as a screw 52.
The clamp member 51 is formed in a flat plate shape, and is fixed to the surface of the sewing machine frame 4 with a screw 52 so as to protrude from the main body portion 53 toward the operator side. And a clamp portion 54 formed in a letter shape. The main body portion 53 and the clamp portion 54 are integrally formed and are made of an elastic member such as a spring material.

The clamp portion 54 includes an upper grip portion 54a that grips the sliding plate 30 from above, and a lower grip portion 54b that grips the sliding plate 30 from below.
The upper grip portion 54a is formed so as to be inclined obliquely downward, and the lower grip portion 54b is formed to be inclined obliquely downward substantially parallel to the upper grip portion 54a. Thereby, when the clamp part 54 hold | grips the sliding plate 30, the edge part of the side which opposes the site | part hold | gripped by the clamping part 54 among the sliding plates 30 inclines diagonally downward toward an operator. It becomes a state.
The distance between the tip of the upper gripping portion 54a and the tip of the lower gripping portion 54b is formed to be smaller than the thickness of the sliding plate 30, and the sliding plate 30 is separated from the upper gripping portion 54a and the lower gripping portion 54b. When inserted in between, the sliding plate 30 is gripped by the elastic force of the clamp portion 54.

As shown in FIGS. 2 and 6, the sliding plate 30 is provided with a convex lens 33 as an optical system lens, and the sliding plate 31 is provided with a convex lens 34.
The convex lenses 33 and 34 are removed from the sewing machine bed 41 and fixed to the sewing machine frame 4 when adjusting the position of the horizontal hooks 10 and 11 with respect to the needles 8 and 9 by the hook shafts 23 and 25 (so-called hook alignment). It is provided on the sliding plates 30 and 31 so that the operator can visually recognize the gap between the needle 8 and the horizontal shuttle 10 and the needle 9 and the horizontal shuttle 11 in a state in which the clamp members 51 are held by the sliding plates 30 and 31. ing.
Further, the sliding plate 30 is provided with a light 55 at a position where light can be irradiated to the gap between the needles 8 and 9 and the horizontal shuttles 10 and 11 when the sliding plate 30 is gripped by the clamp portion 54. Yes. By providing the light 55, workability can be further improved. Here, the light 55 is connected to a power source when the sliding plate 30 is gripped by the clamp member 51 and is turned on. When the light plate 55 is released from the gripping of the clamp member 51, the connection with the power source is cut off and the light is turned off. It can also be configured.

<Effect>
According to the sewing machine 1, when adjusting the position of the horizontal hooks 10, 11 with respect to the needles 8, 9 (so-called hooking is performed), the operator has a convex lens on the clamp member 51 fixed to the sewing machine frame 4. The sliding plate 30 provided with 33 is gripped. At this time, the clamp member 51 is arranged so that the operator can visually recognize the enlarged images of the needles 8 and 9 and the horizontal hooks 10 and 11 by the convex lens 33 when the clamp member 51 grips the sliding plate 30. Therefore, the operator can work while looking at the needles 8 and 9 and the horizontal hooks 10 and 11 through the convex lens 33 of the sliding plate 30 only by holding the sliding plate 30 by the clamp member 51. Thereby, an operator becomes easy to visually recognize the clearance gap between the needle | hooks 8 and 9 and the horizontal hooks 10 and 11, and workability | operativity improves. Therefore, even if the surrounding environment (the lighting is not sufficiently applied to the extent necessary for the hook alignment, or other parts are present in the vicinity), the workability of the hook alignment operation can be improved.
Further, since the operator can work while looking at the needles 8 and 9 and the horizontal hooks 10 and 11 through the convex lens 33 in a state where the sliding plate 30 is held by the clamp member 51, the operator holds the sliding plate 30. This eliminates the need for both hands to be free, and the hands can be aligned with both hands, thus improving workability.

<Others>
The scope of the present invention is not limited to the above embodiment. For example, the optical system lens that forms an enlarged image of the needle and the horizontal hook is not limited to the convex lens described above, and may be configured by combining a plurality of types of optical system lenses such as a concave lens and a prism. Further, the number of sliding plates may be one.
Further, without providing the clamp member 51, the operator may perform the hook alignment operation while holding the sliding plate 30 with one hand. Specifically, when the worker performs the hook alignment, the worker removes the sliding plates 30 and 31 from the sewing machine bed 41. Then, for example, the operator performs the hook alignment while viewing the enlarged images of the needles 8 and 9 and the horizontal hooks 10 and 11 through the convex lens 33 while holding the sliding plate 30 by hand.

With this configuration, when the distance between the two needles 8 and 9 is changed, the arrangement position of the horizontal shuttles 10 and 11 with respect to the needles 8 and 9 is adjusted (so-called hook alignment). The operator removes the sliding plates 30 and 31 from the sewing machine bed 41 and works while looking at the needles 8 and 9 and the horizontal shuttles 10 and 11 through the convex lens 33 provided on the sliding plate 30. The convex lenses 10 and 11 are arranged between the operator and the needles 8 and 9 and the horizontal hooks 10 and 11 so that the enlarged images of the needles 8 and 9 and the horizontal hooks 10 and 11 can be visually recognized by the operator. it can. This makes it easier for the operator to visually recognize the gap between the needles 8 and 9 and the horizontal hooks 10 and 11, and improves the workability of hook setting.
Therefore, even if the surrounding environment (the lighting is not sufficiently applied to the extent necessary for the hook alignment, or other parts such as the feed dog 15 are present in the vicinity), the horizontal hooks 10 and 11 are arranged with respect to the needle. The workability of the work for adjusting the position (so-called hooking work) can be improved. Further, the accuracy of the hook alignment is improved, and the breakage of the needles 8 and 9 and the loss of the sword tips 10a and 11a of the horizontal hooks 10 and 11 can be greatly suppressed, and the cost can be reduced. Further, by improving the accuracy of the hook alignment, the upper thread and the lower thread can be entangled smoothly, and the quality of the sewing product can be improved.

The convex lens 33 is provided so as to be positioned above the horizontal hook 10 when the sliding plate 30 is attached to the sewing machine bed 41, and the amount of yarn wound around the bobbin accommodated in the horizontal hook 10 through the convex lens 33. When the sliding plate 30 is attached to the sewing machine bed 41, the amount of yarn wound around the bobbin stored in the horizontal hook 10 can be visually recognized when the sliding plate 30 is attached to the sewing machine bed 41. Therefore, the thread amount can be confirmed without removing the sliding plate 30 during sewing.
The convex lens 34 is provided so as to be positioned above the horizontal hook 11 when the sliding plate 31 is attached to the sewing machine bed 41, and the amount of yarn wound around the bobbin accommodated in the horizontal hook 11 is visually recognized through the convex lens 34. When the sliding plate 31 is attached to the sewing machine bed 41, the amount of thread wound around the bobbin stored in the horizontal hook 11 can be visually recognized when the sliding plate 31 is attached to the sewing machine bed 41. The thread amount can be confirmed without removing the sliding plate 31 during sewing.
Therefore, it is possible to facilitate the operation of checking the remaining amount of thread during sewing and improve the workability of sewing.

In addition, instead of providing the convex lenses 33 and 34 on the sliding plates 30 and 31 provided on the sewing machine bed 41, a plate material having a thickness that can be gripped by the clamp member 51 is provided as a separate component from the components constituting the sewing machine. By providing this convex lens and light and attaching this plate material to the clamp portion 51, it is possible to achieve the same effects as in the above embodiment.
In addition, the design can be freely changed within the scope of the invention.

The front view which shows the outline of a sewing machine. The perspective view which shows the structure inside a sewing machine bed. The disassembled perspective view which shows the drive mechanism of a horizontal hook. The front view of the hook shaft stand vicinity of a sewing machine bed. The perspective view which shows the back side of a sewing machine bed. The perspective view from the upper surface of a sewing machine bed. The perspective view from the front side of the sewing machine of the state which attached the sliding plate to the clamp member. The side view of the sewing machine seen from the arrow A direction in FIG. The figure which shows the positional relationship of the sword tip and needle | hook of a horizontal hook in a prior art.

Explanation of symbols

1 sewing machine 8 needle 9 needle 10 horizontal shuttle 11 horizontal shuttle 10b shuttle shaft 11b shuttle shaft 23 shuttle shaft base 25 shuttle shaft base 30 Sliding plate (covering member)
31 Sliding plate (coating material)
33 Convex lens (optical lens)
34 Convex lens (optical lens)
41 Sewing machine bed 51 Clamp member

Claims (1)

A needle that moves up and down along one axis;
A horizontal hook provided inside the sewing machine bed, rotated by a hook shaft and forming a seam in cooperation with the needle;
A hook shaft base for supporting the horizontal hook and making the arrangement position of the horizontal hook adjustable;
A sewing machine that covers the upper side of the horizontal hook and is covered with the sewing machine bed so as to be detachable.
An optical lens provided on the covering member;
A clamp member fixed to a sewing machine frame and capable of gripping the covering member,
The sewing machine is characterized in that when the clamp member grips the covering member, an operator can visually recognize an enlarged image of the needle and the horizontal shuttle with the optical system lens.

Images