JP3152188U - Sewing machine bobbin case opener - Google Patents

Abstract

A bobbin case opener for a sewing machine capable of reducing the overall volume is provided. A bobbin case opener includes a cam (1), the cam (1) is fixed on a transmission shaft, a passive part of the cam (1) forms a rod-shaped gear (5), the cam (1) interlocks the rod-shaped gear (5), and a pivot (7) is provided. In order to open and close the thread passage, the continuous rotation movement of the transmission shaft is directly converted into the reciprocating swing movement of the opener bar 70 above the pivot 7 by the shape of the edge of the cam 1 by meshing with the gear 71 and rotating. Can eliminate parts such as connecting bars and swing arms, thus saving space, reducing the overall volume, and the driving power is directly connected to the transmission shaft, so its speed Is only half of the rotary shuttle platform, thus reducing wear and reducing noise. [Selection] Figure 1

Description

  The present invention relates to a bobbin case opener for a sewing machine, and more particularly to a bobbin case opener for a sewing machine that is used in a sewing machine and drives the bobbin case to open or close a thread passage.

  The conventional opener drive system is usually performed by installing a deflection rotation mechanism including parts such as a connecting rod and a support shaft on a shuttle hook transmission shaft, thereby achieving the purpose of opening a thread passage. . However, since the rotation speed of the deflection rotation mechanism is the same as the rotation speed of the shuttle hook and is twice that of the transmission shaft, the opener driver circulates twice, but once to open the thread passage, it circulates once. The remaining one time is unnecessary. For this reason, the parts are easily damaged and the noise is large.

  In order to solve the above problems, a sewing machine of Patent Document 1 was developed. The sewing machine includes an upper arm portion, a vertical frame, a lower case-like substrate, and an arm shaft is installed in the arm portion. A vertical shuttle hook is installed in the substrate, and the transmission shaft of the shuttle hook is driven by the transmission shaft through the cone gear transmission. The transmission shaft further drives the above-described arm shaft by a gear belt transmission device, and the speed of the shuttle hook transmission shaft is twice that of the transmission shaft. A bobbin case that freely rotates relative to the shuttle hook is installed in the shuttle hook, and the bobbin case is provided with a support bar that protrudes upward, so that two obstructing convex blocks on the lower side of the needle hole plate are provided. Held in between. When the support bar is located between the two obstructing convex blocks, the air passage on both sides of the support bar and the upper air passage form a continuous thread path.

On the other hand, in the method of opening the thread passage, the opener bar of the opener is used to contact the convex block of the opener on the shuttle hook. As a result, the bobbin case rotates in the opposite direction to the shuttle hook rotation direction, and the support bar is held between the two blocking convex blocks. When the opener bar does not contact the opener convex block and obstructs the bobbin case, the bobbin case rotates in the same direction as the shuttle hook, and the support bar contacts one of the two obstructed convex blocks. And block the path of the thread. The operation of the bobbin case opener is driven by a contact bar coupled to the opener drive shaft and an axially curved disk part coupled to the transmission shaft.
However, in the above-described structure, the contact mode between the contact bar and the axially curved surface board component is sliding contact, which is disadvantageous for the installation of the roller and wear is relatively large. In addition, since the movement of the contact rod is a swing method, it is necessary to use a larger space.

China Patent No. 200380100280.3 Specification

  The main purpose of the present invention is to interlock the meshing rotation of the rod-shaped gear and the gear by a cam, and directly convert the continuous rotational motion of the transmission shaft into a reciprocating swing motion by the shape of the cam edge, thereby opening and closing the thread passage Therefore, it is to provide a bobbin case opener for a sewing machine that can omit parts such as a connecting rod and a swing arm adopted by a conventional drive mechanism, and thus can save space and reduce the overall volume. .

  The next purpose of the present invention is that the driving power is transmitted directly to the pivot of the opener bar through the rotation and contact of the transmission shaft, so that it is possible to reduce the wear and noise of the parts, To provide a bobbin case opener for a sewing machine capable of opening and closing a thread passage at a better timing.

To achieve the above object, the present invention provides the following bobbin case opener for a sewing machine.
The bobbin case opener of the sewing machine is installed on the rotary shuttle base of the sewing machine, and the transmission shaft is installed in the rotary shuttle base.
The bobbin case opener includes a cam, a bar gear, and a pivot.
The cam is fixed on the transmission shaft, and an edge of the cam is provided with a convex portion for controlling operation timing,
The rod-shaped gear is provided with a gear portion, is installed in a movable state on the rotary shuttle base, and is connected to an edge of the cam by a contact end;
The pivot is provided with an opener bar at the upper end, and is movably connected to the rotary shuttle base. A gear that meshes with the gear portion of the bar gear is installed on the pivot, and a torque spring is placed on the pivot. ,
When the rod gear contacts another position outside the convex portion of the cam, the opener rod moves away from the opener convex block on the bobbin case, and at this time, the bobbin case has a support rod that is the first of the needle hole plate. Rotate with the rotating shuttle that supports the bobbin case until it touches the blocking block and blocks the thread path,
When the transmission shaft rotates and the convex portion of the cam comes into contact with the contact end of the rod-shaped gear, the convex portion moves the rod-shaped gear outward, and the rod-shaped gear drives the gear meshing with it. This causes the pivot to rotate clockwise, driving the opener bar, swinging in the direction of the bobbin case and contacting the opener convex block, so that the bobbin case is rotated Rotate along the opposite direction of the shuttle,
At this time, the support rod is separated from the first obstruction block, opens a thread passage, and the torque spring is interlocked and rotated,
When the cam continues to rotate and the convex portion leaves the contact end of the rod-shaped gear, the torque spring causes the gear and the pivot to rotate in the opposite directions, causing the rod-shaped gear to move backward, and the opener rod is an opener convex block. Leave
At this time, the bobbin case rotates with the rotating shuttle until the support bar contacts the first blocking block and re-blocks the thread path.

  The present invention interlocks the meshing rotation of the rod-shaped gear and the gear with a cam, directly converts the continuous rotational motion of the transmission shaft into a reciprocating swing motion according to the shape of the cam edge, and opens and closes the thread passageway. Parts such as a connecting rod and a swing arm adopted by the drive mechanism can be omitted, and thus the space can be saved and the overall volume can be reduced. Furthermore, the driving power is transmitted directly to the pivot of the opener bar through the rotation and contact of the transmission shaft, so that it is possible to reduce the wear and noise of the parts, and at a better timing, the yarn You can open and close the street.

It is a three-dimensional schematic diagram of the present invention. It is the schematic of the installation position which uses this invention for a sewing machine. FIG. 3 is a schematic plan view of the present invention as viewed from the a1 direction in FIG. 2. FIG. 3 is a schematic plan view of the present invention as viewed from the direction a2 in FIG. 2;

  As shown in FIGS. 1, 2, and 3, the bobbin case opener of the sewing machine of the present invention includes a cam 1. The cam 1 is installed on the transmission shaft 2, and the transmission shaft 2 is installed in the rotary shuttle base 4 on the sewing machine substrate 3 (see FIG. 2). The edge of the cam 1 is provided with a convex portion 10 for controlling the operation timing. The rod-shaped gear 5 including the gear portion 50 and the flat surface 51 is in contact with and connected to the edge of the cam 1 by its contact end 52. The opposite end of the rod-like gear 5 is installed in the rotary shuttle base 4 via the coupling part 6. The contact end 52 comes into contact with the edge of the cam 1 by the roller 520. In the coupling component 6, a coupling hole 61, an insertion hole 62, and an accommodation installation hole 63 are installed. The opposite end of the rod-like gear 5 is installed by being inserted into the coupling hole 61 in a movable state. Moreover, the insertion pin 64 is inserted and installed in the insertion hole 62, and is connected to the flat surface 51 of the rod-shaped gear 5 to prevent the rod-shaped gear 5 from rotating.

  A pivot 7 having an opener bar 70 at the upper end is movably connected to the rotary shuttle platform 4, and a gear 71 is installed on the pivot 7. The pivot 7 passes through the accommodation installation hole 63 of the coupling component 6, whereby the gear 71 is located in the coupling component 6 and meshes with the gear portion 50 of the rod-shaped gear 5. As a result, the rod-shaped gear 5 drives the rotation of the pivot 7 to swing the upper opener rod 70. The pivot 7 is provided with a rotating plate 72 and a fixed component 73 below the gear 71. A hook hole 720 fixing hole 730 is installed on each of the rotating plate 72 and the fixing component 73, and a torque spring 74 is fitted and connected between the rotating plate 72 and the fixing component 73. Both ends of the torque spring 74 are inserted and fixed in the hook hole 720 and the fixing hole 730, respectively. Due to the torque of the torque spring 74, the roller 520 constantly contacts and connects to the edge of the cam 1. The bottom end of the pivot 7 passes through the rotary shuttle table 4 and includes an annular engagement tank 75. In the engagement tank 75, an engagement spring 76 is fitted to fix the rotation direction of the pivot 7.

  As shown in FIGS. 3 and 4, the bobbin case 8 includes an opener convex block 81 and a projecting support rod 82. When the opener bar 70 swings in the direction of the bobbin case 8, the opener bar 70 contacts and is connected to the opener convex block 81 of the bobbin case 8. When the bar gear 5 contacts another position outside the convex portion 10 of the cam 1, the opener rod 70 moves away from the opener convex block 81. At this time, the bobbin case 8 rotates together with the rotary shuttle 9 that supports the bobbin case 8 until the support bar 82 contacts the first blocking block 31 of the needle hole plate 30 and closes the thread passage.

  When the transmission shaft 2 rotates and the convex portion 10 of the cam 1 and the contact end 52 of the rod-shaped gear 5 come into contact with each other, the convex portion 10 pushes the rod-shaped gear 5 outward and the rod-shaped gear 5 engages with the gear. 71 is driven and rotated. As a result, the pivot 7 rotates clockwise, drives the opener bar 70, swings in the direction of the bobbin case 8, and contacts the opener convex block 81. Thus, the bobbin case 8 rotates along the direction opposite to the rotation direction of the rotary shuttle 9. At this time, the support bar 82 is separated from the first inhibition block 31 and opens a thread passage. When the pivot 7 rotates, the torque spring 74 is interlocked by the rotating plate 72 and rotates. When the cam 1 continues to rotate and the convex portion 10 leaves the contact end 52 of the rod-shaped gear 5, the torque spring 74 causes the gear 71 and the pivot 7 to rotate in opposite directions, causing the rod-shaped gear 5 to return, and the opener rod 70 is The opener convex block 81 is left. At this time, the bobbin case 8 rotates together with the rotary shuttle 9 until the support bar 82 comes into contact with the first blocking block 31 and blocks the thread passage again.

  The present invention interlocks the meshing rotation of the rod-shaped gear 5 and the gear 71 with the cam 1 and directly converts the continuous rotational motion of the transmission shaft 2 into the reciprocating swing motion of the opener rod 70 according to the shape of the edge of the cam 1. Parts such as a connecting rod and a swing arm employed by a conventional drive mechanism can be omitted. Thus, space can be saved and the overall volume can be reduced. Moreover, since the driving power is directly connected to the transmission shaft 2, the speed is similar to that of the transmission shaft 2. When the transmission shaft 2 makes one round, the opener opens and closes once, and the speed of the rotary shuttle 9 is determined by the transmission shaft 2. 2 times, so the speed of the opener is only half that of the rotary shuttle 9. In this way, wear is reduced, noise is reduced, and the yarn path can be opened and closed at better timing.

DESCRIPTION OF SYMBOLS 1 Cam 10 Convex part 2 Transmission shaft 3 Substrate 30 Needle hole plate 31 Blocking block 4 Rotary shuttle stand 5 Rod-shaped gear 50 Gear part 51 Plane 52 Contact end 520 Roller 6 Coupling part 61 Coupling hole 62 Insertion hole 63 Accommodating installation hole 64 Insertion pin 7 Pivot 70 Opener bar 71 Gear 72 Rotating plate 720 Hook hole 73 Fixed part 730 Fixed hole 74 Torque spring 75 Engaging tank 76 Engaging spring 8 Bobbin case 81 Convex block 82 Support bar 9 Rotating shuttle

Claims (6)

Installed on the rotary shuttle base of the sewing machine, installed a transmission shaft in the rotary shuttle base,
The bobbin case opener includes a cam, a bar gear, and a pivot.
The cam is fixed on the transmission shaft, and an edge of the cam is provided with a convex portion for controlling operation timing,
The rod-shaped gear includes a gear portion, is installed in a movable state on the rotary shuttle base, and is connected to an edge of the cam by a contact end;
The pivot has an opener bar at the upper end, is movably connected to the rotary shuttle base, a gear that meshes with a gear portion of the rod-shaped gear is installed on the pivot, and a torque spring is placed on the pivot. Sewing machine bobbin case opener.   The bobbin case opener for a sewing machine according to claim 1, wherein a rotating plate and a fixing part are provided on the pivot, a hook hole and a fixing hole are respectively installed on the rotating plate and the fixing part, and the torque spring Both ends of the bobbin case opener for a sewing machine are fixed by being inserted into the hook hole and the fixing hole, respectively.   2. The bobbin case opener for a sewing machine according to claim 1, wherein the opposite end of the rod-shaped gear is coupled to a coupling component fixed to the rotary shuttle base, and a coupling hole is provided in the coupling component, opposite to the rod-shaped gear. A bobbin case opener for a sewing machine, wherein an end is inserted and installed in the coupling hole.   4. A bobbin case opener for a sewing machine according to claim 3, wherein said connecting part is provided with an insertion hole, said rod-shaped gear is provided with a flat surface, and an insertion pin is inserted into said insertion hole, and said rod-shaped gear is installed. Sewing machine bobbin case opener characterized by being connected to the plane of the machine.   4. A bobbin case opener for a sewing machine according to claim 3, wherein said connecting part is provided with a receiving installation hole, and said pivot passes through said receiving installation hole, whereby said gear is located in said connecting part. Sewing machine bobbin case opener.   2. The bobbin case opener for a sewing machine according to claim 1, wherein a roller is provided at a contact end of the rod-shaped gear.

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