JPS642711Y2 - - Google Patents

Description

[Detailed Description of the Invention] Technical Field This invention relates to a vertical hook for a sewing machine, and more specifically, instead of using a bobbin case, which is complicated to attach and remove the bobbin, the invention uses a hinge attached to the inner hook so that it can be opened and closed freely. Load the bobbin directly into the lid body.
This invention relates to a vertical hook for a sewing machine which allows a bobbin to be attached and removed from an inner hook easily and quickly, and also allows thread to be smoothly removed from the hook.

Prior Art and Its Problems In the conventional vertical hooks of sewing machines, the bobbin is stored in a bobbin case, and then the bobbin case is loaded into the inner hook of the vertical hook, which is composed of an outer hook and an inner hook. It is structured to do this.
However, since the inner pot is located below the sewing machine bed, when the operator wants to replace the bobbin, he or she must look inside the sewing machine through the opening/closing window provided below the sewing machine bed and use the knob provided on the bobbin case. This requires a complicated operation of raising the bobbin case and taking it out in the axial direction, and it is also troublesome to set the bobbin case in the correct position when loading it into the inner pot.

Furthermore, when using a bobbin case, it is necessary to insert the bobbin into the bobbin case and then pass the thread through the bobbin thread tension spring. However, when trying to adjust the bobbin thread tension, each time the bobbin case is inserted into the inner hook, must be taken out. If this operation is performed in the middle of sewing with a sewing machine, there is a drawback that the bobbin thread becomes slack, resulting in uneven stitching. The reason why it is complicated to attach and remove the bobbin on the vertical hook of a sewing machine, and it is also difficult to adjust the bobbin thread, is that, as mentioned above, with conventional vertical hooks, the bobbin is placed in a separate bobbin case. This is due to the fact that the bobbin case is stored in the inner pot and the bobbin case is loaded into the inner pot.

Purpose The present invention has been devised in view of the above-mentioned drawbacks inherent in the vertical hooks of conventional sewing machines, and has been devised to solve the problems and to simplify and quickly load and unload bobbins into the vertical hooks. To further improve the operability of a sewing machine by simplifying the adjustment of a bobbin thread and allowing smooth removal of an upper thread from a hook.

Solution: In order to achieve the above object, the vertical hook of the sewing machine according to the present invention has a cover body hinged to the inner pot, which can be opened and closed, instead of using a bobbin case, and a support shaft arranged upright on the back side of the cover body. It is configured so that the bobbin can be rotatably inserted and inserted, and the lid body can be held closed and opened with respect to the inner pot with a simple operation. As a result, loading and unloading the bobbin is
This can be done simply and quickly by simply opening and closing the lid, and there are also advantages in that there is no need to pass the lower thread through the lower thread tension spring provided in the bobbin case, as required in the past.

Embodiments Next, a preferred embodiment of the vertical hook of the sewing machine according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is an exploded perspective view showing the overall basic configuration of the vertical pot according to the present invention;
FIG. 2 is a sectional view showing the inner pot loaded into the outer pot, and FIG. 3 is a perspective view showing the inner pot with the lid opened.

In the figure, reference numeral 10 indicates an outer hook, and this outer hook 10 has a horizontal shaft 1 connected to a drive source (not shown).
2 through a boss 14 so as to be rotatable around a horizontal central axis. The outer pot 10 has a cylindrical cavity 1 therein.
6, and an annular step 18 is provided around the inner peripheral end surface of the cavity 16.

Further, a recess 224 for storing the bobbin 22 is formed in the center of the inner hook 20, and a recess 224 for storing the bobbin 22 is formed on the outer peripheral surface of the inner hook 20. An annular protrusion 26 is provided around the annular step portion 18 in sliding contact with the annular step portion 18, and
A rim 28 is formed at the opening end edge of the bobbin storage recess 24. As shown in FIGS. 2 and 3, this rim 28 is provided with a necessary recess 33 that also serves as a thread path for guiding and leading out the bobbin thread.
A detent 32, which will be described later, engages with the inner pot 2.
It is designed to prevent zero rotation.

Furthermore, when the inner pot 24 is loaded into the outer pot 10,
The annular protrusion 26 fits into the annular step 18 of the outer hook 10, and in this state, the ring-shaped holding plate 30 is attached to the outer hook 1.
By attaching the protrusion 26 to the open end of the protrusion 26 with a fastening means such as a screw, the protrusion 26 is slidably and rotatably held between the annular step 18 and the presser plate 30.
As shown in FIG. 2, the inner hook 20 is attached to the sewing machine frame by engaging a detent 32 extending from the sewing machine frame (not shown) into a recess 33 formed in the rim 28. is locked. By driving the horizontal shaft 12, the outer pot 10 is transferred to the inner pot 2.
It rotates with respect to zero and unwinds the thread.

As shown in FIGS. 1 to 3, a lid 34 for opening and closing the bobbin storage recess 24 is hinged to the lower end of the inner pot 20. As shown in FIGS. That is, in FIG. 1, a notch 36 is formed in the lower end of the inner pot 20 from the inner circumferential surface close to the opening of the bobbin storage recess 24 to the rim 28. The lid body 34 is made of a circular member sufficient to tightly cover the inner periphery of the opening of the bobbin storage recess 24, and a protruding piece 38 extending in the radial direction is integrally formed on a part of the periphery of the lid body 34. has been done. This protrusion 3
8 is inserted into the notch 36, and the pin 40 is commonly inserted into the illustrated through holes 41, 41.
The lid body 34 is hingedly connected to the inner pot 20 so as to be openable and closable.

As shown in FIG. 3, a hollow cylindrical support shaft 44 that can be fitted into the through hole 42 of the bobbin 22 is fixed upright at the center of the inner surface of the lid 34. A bobbin braking mechanism 46 (described later) for adjusting the bobbin thread, which is shown in a longitudinal section in FIG. 2, is incorporated as necessary.

Moreover, the lid body 34 is, as is clear from FIG.
The recess 24 in the inner pot 20 is opened and closed by rotating around the fulcrum provided by the pin 40. In this case, the lid 34 is securely held in the closed position, and the recess 24 is rotated as needed. As a means for easily opening the lid 34, the illustrated closing holding member is interposed between the inner pot 20 and the lid 34.
This closing holding member has a toggle mechanism 4 that elastically holds the lid 34 closed by a so-called snap action.
8, and a mechanism 50 that locks the lid body 34 by mechanically engaging a locking body 66, which will be described later, in a holding recess 60 provided close to the rim 28. , the mechanisms of each of these will be explained.

First, the toggle mechanism 48, as shown in FIGS. 2, 5, and 6, engages with the free end of the protrusion 38 provided on the lid 34 to keep the lid 34 in the normally closed position. It is composed of an elastic body 52 that urges the For example, as shown in FIG. 5, this elastic body 52 is made of a plate spring bent into an appropriate shape.
One end of the rim 28 is fixed to the back surface of the rim 28 provided around the inner pot 20 via a screw 54, and the other end is attached to the lid 34.
The free end portion of the protruding piece 38 is always elastically abutted on the protruding piece 38. As shown in FIG. 6, the free end of the projecting piece 38 has two ridges 56a and 56b.
When the lid body 34 is closed, the elastic body 52 comes into contact with one of the ridges 56a of the projecting piece 38 (see FIG. 6, 1), and when the lid body 34 is opened,
When the ridge portion 56a moves by pressing against the elastic body 52 and passes through the consideration point l (see FIG. 6, 2), the contact surface of the protruding piece 38 with the elastic body 52 becomes It is designed to switch to the other ridge portion 56b.

Therefore, the elasticity of the elastic body 52 acts in a direction to close the lid 34, and the lid 34 snaps and turns all at once to the open position shown in FIG. 6.
When the lid body 34 is opened in this way, as shown in FIG.
In order to ensure that the open end of the support shaft portion 44 is stably held in an upwardly oriented state, as shown by the dotted chain line, a hole is provided at the position where the notch 36 is formed in the rim 28 of the inner pot 20. As shown in Figure 1, the notch 3
6 to the rim 28, which is a rising part 5.
8 are integrally provided. As shown in FIG. 2, when the lid body 34 is opened to the maximum, the lid front side of the protruding piece 38 of the lid body 34 is brought into contact with the contact portion 58.
It comes into contact with and rests at a predetermined angle. This state can also be clearly observed from FIG. 6 (if this abutment part 58 is not provided, the lid body 34 will be inverted approximately 180 degrees and hang down, and the axis of the support shaft part 44 will be diagonally downward). (The bobbin 22 will easily fall off.)

Further, the mechanical locking mechanism 50 for the lid body 34 is
As shown in FIG. 1, the bobbin storage recess 24 in the inner pot 20 is rotatably supported by a holding recess 60 formed close to the rim 28 and the lid body 34 via a screw 62. and a locking body 66 provided with a locking end 64 that can move forward and backward with respect to the recess 60, and in order to allow the locking end 64 to enter into the holding recess 60,
It basically consists of an elastic body 68 that constantly urges the locking body 66 in the engagement direction. That is, the locking body 66 is housed in a groove 70 recessed on the back surface of the lid body 34 (see FIG. 1), and the elastic body 68 is formed in a U-shape, with one end of the elastic body 68 being formed into a U-shape. It is brought into contact with the inner surface of the groove portion 70 and the other end is brought into contact with a bent piece 72 formed on the locking body 66 to be elastically interposed, and the locking end 64 is inserted into the holding recess 60. It is designed to be constantly energized toward the target.

Further, the locking body 66 includes an operating portion 74 for retracting the locking end 64 from the holding recess 60,
As clearly shown in FIG. 4, the operating portion 74 is arranged in a positional relationship such that it always projects slightly from a notch 76 formed on the free end side of the lid body 34. That is, the operating portion 74 slightly protrudes from the notch 76 as shown by the solid line, and in this state, the locking end 6 of the locking body 66
4 enters the holding recess 60 and holds the lid 34 closed.

When the locking end 64 is retracted from the holding recess 60 in order to open the lid 34, the locking end 64 can be moved downward by pressing the operating portion 74 with a finger.
6 is rotated slightly counterclockwise about the pivot point provided by the screw 62 to the position shown by the two-dot chain line, and the engagement is released. Further, the locking body 6
6 is formed with a key-shaped bent portion 80 for gripping the collar portion 78 of the bobbin 22 (see FIG. 1 and FIG. 6, FIG. 2). When the operation section 74 rotates slightly, the key-shaped bent section 80 enters toward the flange section 78 and grips the flange section 78, so that when the operation section 74 is operated, the operator may accidentally remove the bobbin. 22 collar part 78
Even if the bobbin 22 is touched, the bobbin 22 will not be moved toward the bobbin storage recess 24 of the inner pot 20.

The bobbin braking mechanism 46 will be explained as follows.
As shown in FIG. 2, a slit 82 is formed in the support shaft portion 44 in the axial direction, and a brake plate 86 with the abutting end portion 84 facing slightly outward from the slit 82
is rotatably supported in the hollow portion of the support shaft portion 44 via a pin 88 . This brake plate 86 is
The compression spring 90 and the adjustment screw 92 press the support shaft 44 in the axial direction, and when the support shaft 44 is inserted through the through hole 42 of the bobbin 22, the contact end 84 of the brake plate 86 It comes into contact with the inner surface of the through hole 42 and applies some pressure braking to the rotation of the bobbin 22.

Effects of the Embodiment Next, regarding the vertical hook of the sewing machine according to the embodiment of the present invention configured as described above, the operation of attaching and removing the bobbin to and from the inner hook will be described. Now the lid body 34 of the inner pot 20
As shown in FIG. 3, it is assumed that the bobbin 22 is opened and laid down substantially horizontally, and the operation of loading the bobbin 22 into the inner hook will be described. Since the end of the support shaft 44 protruding from the lid body 34 is oriented diagonally upward, the through hole 42 of the bobbin 22 is inserted into the support shaft 44 (at two points in FIG. 2). (shown by a chain line), the bobbin 22 is easily loaded into the recess 24 of the inner hook 20 by pushing the lid 34 upward around the pin 40.

When the lid body 34 is closed, the key-shaped bent portion 80
By setting the locking body 66 so that it is in sliding contact with the inner circumferential wall of the inner pot 20, the locking body 66 is rotated slightly counterclockwise in FIG. 4 against the elasticity of the elastic body 68. Therefore, the locking end 64 of the locking body 66 smoothly enters and engages the holding recess 60, and the lid body 34 is securely held closed. Further, as described above, the ridge portion 56b formed on the protruding piece 38 passes through the consideration point l while pressing the elastic body 52,
Subsequently, switching to the ridge portion 56a, the elastic body 52
The lid body 34 is biased and held in the closed position by changing the direction of the elastic pressing.

To take out the bobbin 22 from the inner pot 20, the operator presses the operating portion 74 of the locking body 66 that slightly protrudes from the notch 76 of the lid body 34 in the state shown by the solid line in FIGS. 2 and 4. Then, the locking body 6
6 in the counterclockwise direction around the screw 62 (as shown by the two-dot chain line in FIG. 4), the locking body 6
The locking end 64 of 6 is retracted from the holding recess 60, and the engagement is released. Next, when the lid body 34 is rotated in the direction of the arrow in FIG. 2 with the pin 40 as the center, the protruding piece 38 performs a so-called snap action against the elastic body 52 through the steps shown in 1 to 3 in FIG. Then, the lid body 34 is opened by turning horizontally in one motion beyond the consideration point l.

In this case, the lid front side of the protruding piece 38 of the lid body 34 comes into contact with the contact portion 58 formed at an appropriate position of the inner pot 20, and the open end of the support shaft portion 44 is directed upward. Since the bobbin 22 is stably held (indicated by the two-dot chain line in FIG. 2), the bobbin 22 will not accidentally fall off from the support shaft portion 44. Furthermore, when the lid body 34 is opened, the key-shaped bent portion 80 formed on the locking body 66 is pressed by the operator's finger.
grips the collar portion 78 of the bobbin 22 that is fitted onto the support shaft portion 44 (see FIGS. 2 and 6).
Therefore, when the lid body 34 is opened, the bobbin 22 also moves together, and the bobbin 22 may be pushed by a finger and come out of the support shaft 44 and remain in the recess 24, or the flange 78 may be pushed inside. There is no problem such as making it difficult to open the lid 34 due to contact with the inner circumferential wall of the recess of the pot 20.

Describing the function of the bobbin braking mechanism 46 here, as described above, the braking plate 86
The abutting end 84 is slightly exposed outward from the slit 82 formed in the slit 82 (see FIG. 6, 3). In this state, if the through hole 42 of the bobbin 22 is inserted into the support shaft 44, the contact end 84 of the brake plate 86 will elastically contact the inner circumferential wall of the bobbin through hole 42, and the support shaft A slight brake is applied to the rotation of the bobbin 22 relative to the bobbin 44, and an appropriate tension is applied to the bobbin thread being let out. Note that the contact resistance applied to the bobbin through hole 42 by the abutting end 84 can be adjusted by rotating the screw 92 and changing the elasticity of the compression spring 90.

Effects of the invention As described above, according to the vertical hook of the sewing machine according to the present invention, instead of using a bobbin case, which was troublesome to attach and detach from the inner hook, a cover body that can be opened and closed is hinged to the inner hook. Since the bobbin can be directly loaded into the lid and the lid can be held closed and opened from the inner pot, loading and unloading of the bobbin can be accomplished extremely easily. Further, since no bobbin case is used, there is no fear of losing the bobbin case, and the number of parts can be reduced, which has the advantage of reducing manufacturing costs. Furthermore, when sewing processed fabric, the loop formed in the needle thread passed through the eye of the needle as it ascends through the fabric passes through both the lid body and the inner pot. The thread can be pulled out smoothly.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the overall basic configuration of a vertical hook of a sewing machine according to an embodiment of the present invention, and FIG. 2 is a view of FIG.
3 is a perspective view of the inner pot with the lid open, FIG. 4 is a front view of the inner pot with the bobbin storage recess closed with the lid, and FIG. 5 is a perspective view of the inner pot with the lid open. An explanatory view showing a toggle mechanism, which is one of the mechanisms for holding the lid closed with respect to the inner pot, and FIGS. 6 1 to 3 are explanatory longitudinal cross-sectional views showing the positional relationship of the toggle mechanism when the lid is opened and closed. 10...Outer pot, 20...Inner pot, 22...Bobbin, 24...Bobbin storage recess, 34...Lid body, 4
2...Through hole, 44...Support shaft portion, 48, 50...
... Closing holding member, 52 ... Elastic body, 58 ... Contact portion, 60 ... Holding recess, 64 ... Locking end, 66
... Locking body, 68 ... Elastic body, 74 ... Operation section,
76...notch, 78...flange, 80...bending part.

Claims (1)

[Claims for Utility Model Registration] [1] In a vertical hook having an outer hook 10 that rotates around a horizontal axis and an inner hook 20 that is disposed within the outer hook 10 and is locked to the sewing machine frame. a lid 34 hinged to the lower edge of the inner pot 20 to open and close the bobbin storage recess 24 formed in the inner hook 20; and a lid 34 protruding from the lid 34 for supporting the bobbin 22. , a support shaft portion 44 that can be fitted into the through hole 42 of the bobbin 22, and a closing holding member provided between the inner pot 20 and the lid 34 to hold the lid 34 in the closed position. Vertical hook of sewing machine including 48 and 50. [2] The closing holding member 48 is attached to the lid body 34
A vertical hook for a sewing machine according to claim 1, which has an elastic body 52 that engages with a portion of the body to bias the lid body 34 to the closed position. [3] When the lid body 34 is opened, the support shaft portion 4
Utility model registration claim 1, wherein the inner pot is provided with a contact portion 58 that can come into contact with the lid body 34 in order to hold the lid body 34 in a state where the lid body 4 faces upward.
Vertical hook of the sewing machine mentioned in section. [4] The closing holding member 50 is attached to the inner pot 20
a holding recess 60 formed in the recess 60 and a locking end 64 that can move forward and backward with respect to the recess 60;
a locking body 66 provided on the lid body 34;
and an elastic body 68 that constantly urges the locking body 66 so that the locking end 64 enters the holding recess 60.
A vertical hook for a sewing machine according to claim 1 of the utility model registration claim. [5] The locking body 66 includes an operating section 74 that can be operated to retract the locking end 64 from the holding recess 60, and the operating section 74 is attached to the lid body 3.
4. The vertical hook of a sewing machine according to claim 4, which is arranged so as to protrude from a notch 76 formed on the free end side of the sewing machine. [6] The locking body 66 is formed with a bent portion 80 for gripping the collar portion 78 of the bobbin 22 when the operating portion 74 is operated. Vertical pot of sewing machine.