JPH0681481U - 2-needle sewing machine - Google Patents

Abstract

(57) [Summary] [Object] An object of the present invention is to provide a two-needle sewing machine capable of easily adjusting the facing distance between both sewing machine hooks when setting the distance between two stitches. According to the present invention, the first and second sewing needles Na and Nb that move up and down with the rotation of a sewing machine spindle supported by a sewing machine arm M1 and a lower shaft 4 supported in a sewing machine bed M1.
0, a first sewing machine shuttle 45 that rotates with the lower shaft, a shuttle unit base M3 that can move back and forth with respect to the sewing machine bed, and a shuttle shaft 50 that is rotatably held by the shuttle unit base. The second sewing machine hook 51, a connecting shaft 53 rotatably held on the hook unit base and interlocking with the hook shaft, and an interlocking mechanism 56 interlocking the connecting shaft and the lower shaft are provided. The first gear 57 fixed to the first hook shaft and the first gear 57
Second gear 58 fixed to the connecting shaft so as to mesh with the gear of
And at least one of both gears is a spur gear having a long tooth width.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a two-needle sewing machine capable of adjusting a facing distance between two sewing needles provided facing each other.

[0002]

[Prior art]

 FIG. 3 is a diagram showing a schematic configuration of a conventional two-needle sewing machine. As shown in the figure, the outer structure of this two-needle sewing machine is defined by a sewing machine bed M1, a sewing machine arm M2 supported by the sewing machine bed M1, and a shuttle unit stand M3 provided facing the side end surface of the sewing machine bed M1. Almost formed. Further, the shuttle unit base M3 can move back and forth in the directions of arrows A and B with respect to the sewing machine bed M1.

Further, the following axes are rotatably supported on the sewing machine arm M2, the sewing machine bed M1 and the shuttle base unit M3 in parallel with the directions of arrows A and B, respectively. That is, the sewing machine main shaft 1 and the two needle bar drive shafts 2, 3 are supported in the sewing machine arm M2, the first shuttle shaft 4 is supported in the sewing machine bed M1, and the shuttle unit stand M3 is provided with A second shuttle shaft 5 is supported coaxially with the first lower shaft 4, and a connecting shaft 6 is supported between the sewing machine bed M1 and the shuttle unit base M3.

Then, the rotation of the sewing machine main shaft 1 is transmitted to the connecting shaft 6 via the timing belt 7 and the pulleys 8 and 9, and the needle bar is further transmitted from the connecting shaft 6 via the timing belt 10 and the pulleys 11 and 12. It is transmitted to the drive shaft 3. Further, the rotation of the sewing machine main shaft 1 is transmitted to the needle bar drive shaft 2 via the timing belt 13 and the pulleys 14 and 15. A needle bar elevating mechanism for elevating and lowering a sewing needle is connected to each of the needle bar drive shafts 2, 3 so that two needles can be simultaneously moved up and down by the rotation of the needle bar drive shafts 2, 3. Has become.

On the other hand, when the sewing needle is moved up and down, in synchronization therewith, the first and second hook shafts 4 and 5 are rotated, and the sewing hooks 22 and 26 fixed to the hook shafts are moved. It is designed to rotate together. That is, the needle bar drive shaft 3 is connected to the first shuttle shaft 4 through the rotary gear 17, the shaft 18, the pulley 19, the timing belt 20 and the pulley 21, and the connecting shaft 6 is connected to the pulley. The second shuttle shaft 5 is connected via 23, a timing belt 24, and a pulley 25. When the sewing machine hooks 22 and 26 rotate together with the hook shafts 4 and 5, stitches are formed in cooperation with the sewing needles. Reference numeral 27 is a cloth feed cam that rotates in conjunction with the needle bar drive shaft 3, and the rotation of this cam causes the actuating member 28 of the cloth feed mechanism to swing, causing the cloth to move in a direction substantially orthogonal to the A and B directions. And it is designed to be intermittently transported.

By the way, in the above-mentioned two-needle sewing machine, it is necessary to appropriately change the interval between the seams to be formed in accordance with the type of product to be handled. In other words, in the two-needle sewing machine, the sewing needle can be moved in the arrow A and B directions, and the sewing hook setting position corresponding to this sewing needle is also adjusted in the same direction (A and B directions). You need to get it.

In view of this, a conventional two-needle sewing machine is known in which the connecting shaft 6 is configured to be expandable and contractible as shown in FIG. The connecting shaft 6 has both ends 6a and 6b fitted into the through holes 6c1 of the connecting member 6c having a cylindrical shape, and is fixed to the connecting members 6c by a fixing screw 6d. 6b is fastened. For this reason, the fixing screw 6d is loosened, the fitting position of each shaft body 6a, 6b is changed, and each shaft body 6a, 6b is fixed again by the fixing screw 6d. Can be adjusted.

Therefore, the two stitches can be changed by changing the facing distance between the sewing needles and adjusting the facing distance between the sewing machine hooks 22 by adjusting the length of the connecting shaft 6. it can.

In the above-described two-needle sewing machine, the sewing machine main shaft 1 is also composed of two shaft bodies 1a and 1b, a connecting member 1c and a fixing screw 1d, and similar to the connecting shaft 6 described above. It can be expanded and contracted. Therefore, in order to adjust the facing distance between the two sewing needles, the length of the sewing machine main shaft 1 is adjusted so that one needle bar drive shaft 2 is moved forward and backward with respect to the other needle bar drive shaft, and the sewing needle elevating mechanism is also operated. This can be done by moving the position of the needle.

[0010]

[Problems to be solved by the device]

 As described above, in the conventional two-needle sewing machine, since the connecting shaft 6 has a structure in which a plurality of members 6a, 6b, 6c are connected by the fixing screw 6d, when adjusting the length thereof, There is a problem that the fixing screw 6d has to be attached and detached each time, and there is a problem that a lot of time and labor is required for the work.

[0011] Furthermore, the fixing screw 6d is loosened due to long-term use of the sewing machine, and the connection state of each member is released, or when the high-speed rotation, high-load drive, etc. are performed, the position of the connection portion shifts. Occasionally, the operation timing between the sewing needle and the sewing machine hook was deviated, and the stitch forming operation could not be performed properly.

This invention was made in view of the above-mentioned problems of the prior art, and is a two-needle sewing machine capable of easily adjusting the facing distance between both sewing machine hooks when setting the distance between the two stitches. For the purpose of provision.

[0013]

[Means for Solving the Problems]

 This invention is directed to a sewing machine spindle rotatably supported by a sewing machine arm, first and second sewing needles that move up and down as the sewing machine spindle rotates, and a lower rotatably supported sewing machine bed. A first sewing machine hook that rotates along with the shaft, a shuttle unit base that is provided so as to be able to move back and forth along the lower shaft with respect to a side end portion of the sewing machine bed, and a rotary unit that is rotatable on the shuttle unit base. The hook shaft that is held, the second sewing hook that is fixed to the hook shaft so as to face the first sewing hook, and that is rotatably held by the hook unit base and interlocks with the hook shaft. A connecting shaft that rotates in a rotating manner, and an interlocking mechanism that interlocks the connecting shaft and the lower shaft, and a first gear fixed to the lower shaft and the connecting shaft so as to mesh with the first gear. And a second gear that is fixed to the Those constituted by a gear having a long tooth width extending.

[0014]

[Action]

 In this invention, when the main shaft of the sewing machine rotates, the first and second sewing needles both start to move up and down, while the lower shaft and the connecting shaft rotate, and the connecting shaft rotates to the shuttle shaft through the interlocking mechanism. Transmitted. As a result, the first and second sewing hooks rotate in synchronism with the raising and lowering operation of the sewing needle, and two stitches are formed in cooperation with each sewing needle. The interlocking mechanism is composed of first and second gears fixed to the lower shaft and the connecting shaft, respectively, and at least one of the gears has a long tooth width extending in the axial direction. Therefore, even if the connecting shaft is moved in the axial direction together with the hook unit base, the meshed state of both gears is maintained, and the interlocking relationship between the lower shaft and the connecting shaft can be maintained. Therefore, when adjusting the distance between two stitches, it is possible to easily perform the operation by adjusting the facing distance between the sewing needles and then moving the hook unit base back and forth according to the position of the sewing needles.

[0015]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a diagram showing an embodiment of the present invention. A two-needle sewing machine according to this embodiment has a sewing machine bed M1, a sewing machine arm M2 and a shuttle unit stand M3, which is similar to the prior art. It is formed, but its internal structure is different as follows.

In the figure, reference numeral 31 denotes a sewing machine main shaft rotatably supported in the sewing machine arm M2. The sewing machine main shaft 31 is composed of a single rod-shaped body, and a drive pulley 32 fixed to one end thereof is connected to a sewing machine motor (not shown) via a belt or the like. At the other end of the sewing machine main shaft, a well-known needle bar drive mechanism including a counterweight 33, a needle bar crank 34, a crank rod 35, a needle bar holder 36, etc. is used to drive the sewing machine main shaft by a sewing machine motor. The rotation is converted into the vertical movement of the needle bar 37. Further, 38 is a needle base fixed to the lower end of the needle bar 37, and two sewing needles Na and Nb are fixed to both sides thereof by needle holding members 39a and 39b. The sewing needles Na and Nb can adjust the facing distance between the sewing needles Na and Nb by moving the needle holding members 39a and 39b in the left and right directions (A and B directions).

On the other hand, 40 is a lower shaft rotatably supported by the sewing machine bed M1. A pulley 41 is fixed to one end of the lower shaft 40, and a timing belt 42 is stretched between the pulley 41 and a pulley 43 fixed to the sewing machine main shaft 30. Reference numeral 44 denotes a first shuttle shaft supported within the sewing machine bed M1, a first sewing machine shuttle 45 is fixed to one end thereof, and a gear 59 is fixed to the other end thereof. The shuttle shaft 44 is supported by two thrust collars 47 and 48 fixed in the sewing machine bed M1 so as to be movable and rotatable in the thrust direction, and is interposed between the thrust collars 47 and 48. By fixing the metal 49 to the shuttle shaft 44 by fastening the fixing screw 49a, the position of the shuttle shaft 44 in the thrust direction can be fixed.

Reference numeral 50 denotes a second shuttle shaft rotatably supported by the shuttle unit base M3, which is coaxially supported with the first shuttle shaft 44 and has one end portion thereof. A second sewing machine 51 is fixed so as to face the first sewing machine 45, and a gear 52 is fixed to the other end. Reference numeral 53 is a connecting shaft provided on the hook from the unit stand M3 to the sewing machine bed M1. The connecting shaft 53 is rotatably held in the shuttle unit base M3 by a thrust collar 54 and the like, and moves together with the shuttle unit base M3 in the thrust direction (arrow A, B direction). A gear 55 meshing with the gear 52 is fixed to one end of the connecting shaft 53, and the rotation of the connecting shaft 53 is transmitted to the second shuttle shaft 50 via the gears 55 and 52. It is supposed to be.

Reference numeral 56 is an interlocking mechanism for interlocking the connecting shaft 53, the lower shaft 40, and the first shuttle shaft 44. This interlocking mechanism includes a first gear 57 fixed to the lower shaft 40, a second gear 58 fixed to the connecting shaft 53 and meshing with the gear 57, and fixed to the first shuttle shaft 44. And a third gear 59 that meshes with the first gear 57. Of these gears 57, 58, 59, the gears 58, 59 other than the first gear 57 each have a long tooth width extending in the axial direction. The meshing position with the first gear 57 can be changed within the width range.

Next, the operation will be described based on the above configuration. When the main shaft of the sewing machine rotates together with the drive pulley 32 by the driving of the sewing machine motor, the rotation of the main shaft of the sewing machine is caused by the needle bar elevating mechanism including the counterweight 33, the needle bar crank 34, the crank rod 35, and the needle bar holder 36. The operation is converted into an elevating operation, and the two sewing needles Na and Nb ascend and descend together with the needle base 38.

On the other hand, the rotation of the sewing machine main shaft 31 is transmitted to the sewing machine lower shaft 40 via the pulley 43, the timing belt 42, and the pulley 41. The rotation of the sewing machine lower shaft 40 is transmitted from the first gear to the first shuttle shaft 44 and the connecting shaft 53 via the second and third gears 59 and 58, from which the gears 55 and 52 are further connected. It is transmitted to the second shuttle shaft 50 via. As a result, the sewing machine hooks 51, 45 fixed to the hook shafts 44, 50 rotate in synchronization with the ascending / descending operations of the sewing needles Na, Nb, respectively, to form stitches.

Further, when changing the interval between the two stitches to be formed, first, the sewing needles Na and Nb are moved together with the needle holding members 39a and 39b in the arrow A or B direction so that both sewing needles are moved. The facing space between Na and Nb is set to the required seam space. Next, the positions of the first and second sewing machine hooks 45 and 51 are set according to the adjusted positions of the sewing needles Na and Nb. This operation is to move the hook unit base M3 and the first hook shaft 44. Done by.

That is, when adjusting the position of the second sewing machine hook 51 with respect to one sewing needle Nb, the hook unit base M3 is moved in the arrow A or B direction, and at the same time, This is done by moving the shuttle shaft 50, the second sewing machine shuttle 51, and the connecting shaft 53. At this time, since the connecting shaft 53 is only connected to the lower shaft 40 via the second gear 58 and the first gear 57, the screw attaching / detaching work and the like as in the above-described conventional technique are not performed. In addition, the shuttle unit base M3 can be moved together with the connecting shaft 53 at any time. Moreover, since the interlocking relationship with the lower shaft 40 is always maintained by the meshing of the gears 57 and 58, there is no fear that the phase with the lower shaft will shift. Therefore, in the adjustment work of the second sewing machine hook 51, the operator can perform the positioning operation of the second sewing machine hook 51 without touching the internal mechanism of the hook unit base M3 at all, and the operation is easy and It can be done in a short time.

Further, for adjusting the position of the first sewing machine hook 45 with respect to the sewing needle Na, the fixing screw 49a is loosened to release the fixed state between the first hook shaft 44 and the metal 49, and the first hook shaft 44 is moved. This can be done by moving in the direction of arrow A or B to align the position with the sewing needle Na and then tightening the fixing screw 49a again. Even in this adjustment work, since the third gear 59 and the first gear 57 are always in mesh with each other, the phase between the lower shaft 40 and the first hook shaft is always kept proper. Leaning, the worker can easily perform the work.

In the above embodiment, this idea is applied to a so-called full-rotary hook type two-needle sewing machine that rotates the lower shaft and the sewing machine hooks 45 and 51 in a fixed direction in conjunction with the sewing machine main shaft 31. However, the present invention can be applied to a two-needle sewing machine other than the full rotary hook type. For example, as shown in FIG. 2, the rotation of the sewing machine main shaft 31 is converted into the swing rotation of the sewing machine lower shaft 53 by the swing crank 60, the crank rod 61 and the connecting link 62. The present invention can also be applied to a needle sewing machine.

In the embodiment shown in FIGS. 1 and 2, the lower shaft 40 is separately provided outside the first and second shuttle shafts 44, 50 and the connecting shaft 53. Without providing the lower shaft 40, the first hook shaft 44 is used as the lower shaft, and this hook shaft 44 is made to interlock with the machine main shaft 31 by a timing belt or the like, and the third gear 59 fixed to the hook shaft 44 is provided. Even if the second gear and the second gear fixed to the connecting shaft 53 are directly meshed with each other, substantially the same effect as the above embodiment can be expected.

Further, in each of the above-mentioned embodiments, since the positions of both sewing needles can be adjusted, the positions of both sewing machine hooks 45 and 51 can be adjusted correspondingly. It is also possible to adjust the distance between the two stitches by adjusting only one sewing needle Nb. In that case, the movement adjustment of the first sewing hook 45 is not necessary. Only the first gear may be a gear having a long tooth width.

[0028]

[Effect of device]

 As described above, the two-needle sewing machine according to the present invention comprises the interlocking mechanism for interlocking the lower shaft and the connecting shaft with the two gears fixed to the shafts and meshing with each other, and at least one of the gears. Since it is composed of a gear with a long tooth width that extends along the axial direction, the position of the sewing machine hook can be adjusted by an extremely easy work, just by moving the hook unit base that holds the connecting shaft. As a result, the burden on the operator can be greatly reduced and productivity can be expected to improve.

[Brief description of drawings]

FIG. 1 is a perspective view showing a schematic configuration of an embodiment of the present invention.

FIG. 2 is a perspective view showing a schematic configuration in another embodiment of the present invention.

FIG. 3 is a perspective view showing a schematic configuration of a conventional two-needle sewing machine.

4 is a partially enlarged view of the connecting shaft shown in FIG.

[Explanation of symbols]

 M1 sewing machine bed M2 sewing machine arm Na sewing needle Nb sewing needle 31 sewing machine spindle 40 lower shaft 45 first sewing machine hook 50 hook shaft 51 second sewing hook 53 connecting shaft 56 interlocking mechanism 57 first gear 58 second gear

Claims (1)

[Scope of utility model registration request] 1. A sewing machine main shaft rotatably supported by a sewing machine arm, and first and second sewing needles which are raised and lowered according to the rotation of the sewing machine main shaft and are provided to face each other on the left and right sides. A lower shaft that is rotatably supported in a sewing machine bed that supports the sewing machine arm and that rotates in conjunction with the sewing machine main shaft; and a lower shaft that is rotatably supported in the sewing machine bed and that accompanies the lower shaft. A rotating first sewing machine hook, a shuttle unit base provided so as to be able to move forward and backward along the axial direction of the lower shaft with respect to a side end portion of the sewing machine bed, and rotatably held in the shuttle unit base. A hook shaft, a second sewing hook fixed to the hook shaft so as to face the first sewing hook, rotatably held by the hook unit base, and interlocked with the hook shaft. A rotating connecting shaft and this connecting shaft and the lower shaft are interlocked. And a linkage mechanism for, the interlocking mechanism includes a second fixed to the connecting shaft so as to mesh with the first gear fixed to the lower shaft, and the first gear
The two-needle sewing machine, characterized in that at least one of the two gears is a gear having a long tooth width extending in the axial direction.