JPH053196Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to an inner hook lifting prevention device in a sewing machine equipped with a horizontal hook.

``Prior Art'' In conventional sewing machines, the inner hook lifting prevention member and the mounting member for attaching the sliding plate to the throat plate are manufactured separately, and these members are attached to the sewing machine frame and throat plate, respectively. It was getting worse. As a result, the number of parts increases, making it difficult to arrange them within the sewing machine bed.

"Problems that the invention attempts to solve" This invention was made to solve the above problems, and is designed to reduce the number of parts and simplify the arrangement within the sewing machine bed, thereby preventing the inner pot from floating up. The purpose is to provide equipment.

"Means for Solving the Problem" According to the present invention, a pair of long grooves that engage with locking protrusions formed on both side edges of the sliding plate are bored in order to slidably support the sliding plate. The synthetic resin support provided is fixed to the lower surface of the throat plate, and the lower surface facing the upper surface of the inner hook and the inner hook are connected with a gap that allows the sewing thread to pass through in order to prevent the inner hook from floating up. There is provided an inner hook lifting prevention device for a sewing machine, characterized in that an engaging protrusion that engages with the hook and prevents its rotation is integrally formed on the support body.

"Function" According to the above structure, since the support body has both the function of preventing rotation and floating of the inner hook and the function of attaching the sliding plate to the throat plate, a special member for preventing rotation and floating of the inner hook is required. This prevents the inner pot from rotating and floating up from the outer pot.

"Aspects of Embodiments" According to the first embodiment of the present invention, the support body may be integrally formed with an engagement protrusion that engages with the inner pot and prevents its rotation. . According to this first aspect, there is an advantage that the structure of the sewing machine can be simplified because no special rotation prevention structure is required to prevent rotation of the inner hook.

According to a second embodiment of the present invention, the support body is integrally formed with a flat surface that covers the opening of the throat plate except for the portion facing the recess of the inner pot. I can do it. According to this second aspect, the recess of the inner hook appears in the opening of the throat plate simply by opening the sliding plate, so that the bobbin thread bobbin can be easily inserted into and taken out from the recess. It has the advantage of being able to prevent dust from entering the interior due to its flat surface and sliding plate.

"Embodiment" Next, an embodiment of the inner pot lifting prevention device of the present invention will be described with reference to the drawings.

FIG. 1 is a top view showing a sewing machine bed to which this embodiment is applied, and FIG. 2 is a sectional view taken along the line -- in FIG. FIG. 3 is a top view showing the relationship between the support and the inner pot of this embodiment, and FIG. 4 is a bottom view showing the support and the inner pot from below.

As shown in FIGS. 1 and 2, the sewing machine bed 1 has an opening 15 that is opened and closed by a sliding plate 4.
A needle plate 2 having a needle hole 2A and a feed dog opening 2B is fixed to the needle plate 2 with a screw 10. Below the throat plate 2, an outer hook 9 that rotates around a vertical axis is provided in the sewing machine bed 1, and the outer hook 9 includes:
An inner hook 6 having a recess 6A for storing a bobbin thread bobbin can be placed from above. A support 3 made of opaque synthetic resin is fixed to the throat plate 2 at its lower surface with screws 11. The support body 3 is for slidably supporting the sliding plate 4, and a flat surface 3 for a receiving plate is provided at the center of the upper surface of the support body 3.
A is formed on both sides of the support body 3, and a pair of long grooves 5 having an L-shaped cross section are bored on both sides of the support body 3, into which the sliding plate 4 is fitted at locking protrusions 4A formed on both side edges thereof. . The sliding plate 4 is made of transparent synthetic resin and has a box-shaped cross section, and has a hanging portion 4B that continues to the locking protrusion 4A. The sliding plate 4 has its center portion sliding on the receiving plate plane 3A of the support body 3, the hanging portion 4B sliding within the vertical hole portion 5B of the long groove 5, and the locking protrusion 4A sliding on the receiving plate plane 3A of the support body 3. The long groove 5 is connected to the support body 3 so as to slide within the horizontal hole portion 5A of the support body 3, and the long groove 5 is communicated with the front surface of the support body 3. As shown in FIG. 1, the sliding plate 4 is provided with a protrusion 12 on the front side of the locking protrusion 4A, so that the sliding plate 4 is fitted into the support body 3 with moderation and tightness. has been done.

Further, as shown in FIG. 2, the support body 3 is integrally formed with a lower surface 13 for preventing the inner pot 6 from floating, and the lower surface 13 of the support body 3 and the upper surface of the inner pot 6 are formed integrally with each other. are opposed to each other with a gap 14 in between. The gap 14 is provided to allow the sewing thread from the bobbin thread bobbin inserted into the recess 6A of the inner hook 6 to pass therethrough. Figures 2, 3 and 4
As shown in the figure, an engaging protrusion 8 that protrudes downward and is integrally formed on the lower surface of the support body 3 to engage with the stepped portion 7 of the inner pot 6. This engaging protrusion 8 has the function of preventing rotation of the inner hook 6 in the direction opposite to the rotational direction A of the outer hook 9.

In addition, the flat surface 3A for the receiving plate in the support body 3
has the function of covering the opening 15 of the throat plate 2, and a bobbin thread bobbin is provided in the portion facing the recess 6A of the inner hook 6 on this receiving plate plane 3A as shown in FIG. An entry/exit hole 16 is provided. In addition, as shown in FIG. 1, the tip 9A of the outer hook 9
is arranged to pass through the outer periphery of the needle hole 2A of the throat plate 2, and the protrusion 6B of the inner hook 6 is brought into contact with a receiver (not shown), causing the inner hook 6 to rotate in the same direction as the outer hook 9. It is designed to prevent this.

"Operation" According to the above configuration, when the sewing machine is started, the outer hook 9 is rotated around a vertical axis in conjunction with the main shaft of the sewing machine, and the sewing needle of the sewing machine is moved up and down through the needle hole 2A of the throat plate 2. As a result, the lower thread and upper thread (not shown) become intertwined and sewing of the work cloth progresses, and as the lower thread is drawn out and consumed from the lower thread bobbin in the recess 6A of the inner hook 6, tries to be lifted upward by the force from the lower thread bobbin, but since the inner hook 6 is pressed down from above by the lower surface 13 of the support 3, the inner hook 6 is prevented from floating up. Moreover, since the rotation of the inner hook 6 is prevented by the engagement protrusion 8 of the support body 3, irregularities in the stitches are prevented, and beautiful machine stitches are formed on the work cloth.

When loading and unloading the bobbin thread bobbin into the recess 6A of the inner hook 6, slide the sliding plate 4 on the receiving plate flat surface 3A of the support 3, and move the sliding plate 4 as shown in FIG. When the recess 6A is pulled out downwardly, the receiving plate flat surface 3
Since it opens to the outside through the bobbin thread bobbin inlet/outlet hole 16 of A, the bobbin thread bobbin can be easily taken in and out of the recess 6A. In addition, the flat surface 3A for the receiving plate
covers the opening 15 of the needle plate 2 except for the part of the bobbin thread bobbin inlet/outlet hole 16 that faces the recess 6A of the inner hook 6. The backing plate flat surface 3A prevents dust from falling into the sewing machine bed 1 through the opening 15 of the throat plate 2. Furthermore, opening 15
Since it is also covered by the sliding plate 4, dust is doubly prevented from falling.

``Effects of the invention'' As described above, according to the invention, one support body that has both the function of preventing rotation and lifting of the inner pot and the function of attaching the sliding plate is integrally formed with synthetic resin, and the support body is integrally formed with synthetic resin. Since it is fixed to the bottom surface, it has excellent effects such as reducing the number of parts and making it easier to assemble the sewing machine.

[Brief explanation of drawings]

Fig. 1 is a top view showing a sewing machine bed in which an embodiment of the device of the present invention is adopted, and Fig. 2 is a -
3 is a top view showing the relationship between the support body and the inner pot of this embodiment, and FIG. 4 is a bottom view showing the support body and the inner pot from below. 1...Sewing machine bed, 2...Throat plate, 3...Support, 3A...Flat surface for receiving plate, 4...Sliding plate, 4A...
Locking protrusion, 5...long groove, 6...inner pot, 6A...recess, 8...engaging protrusion, 9...outer hook, 13...bottom surface, 14...gap, 15...opening , 16...Bobbin thread bobbin entry/exit hole.

Claims (1)

[Claims for Utility Model Registration] (1) A throat plate that is fixed to the sewing machine bed and has an opening that is opened and closed by a sliding plate, and an outer hook that rotates around a vertical axis below the throat plate;
In a sewing machine having a recess for storing a bobbin thread bobbin, and an inner hook placed on the outer hook from above, a sewing machine is provided on both sides of the sliding plate to slidably support the sliding plate. A synthetic resin support having a pair of long grooves that engage with the locking projections is fixed to the lower surface of the throat plate, and a sewing thread is attached to the support to prevent the inner pot from floating up. A lower surface facing the upper surface of the inner pot with a space therebetween that allows the passage of the inner pot, and an engaging protrusion that engages with the inner pot and prevents its rotation are integrally formed. A device to prevent the inner pot from floating in a sewing machine. (2) The claim for utility model registration is characterized in that the support body is integrally formed with a flat surface that covers the opening of the throat plate except for the portion facing the recess of the inner pot. A lifting prevention device for an inner pot in a sewing machine according to item 1.