JPH0580478U - 2-needle sewing machine - Google Patents

Abstract

(57) [Abstract] [Purpose] The sewing width in the two-needle sewing device is simple and
Be able to change in a short time. [Structure] An upper unit which is provided with a position-invariant first needle bar balance mechanism A, a corresponding position-invariant first hook 26, and a gear mounted on a main shaft 3 with a key sandwiched therebetween, and whose position can be changed in the main-axis direction. A second needle bar balance mechanism B attached to the table 15;
A lower unit base 23 having a gear mounted on a counter shaft 22 parallel to the main shaft 3 with a key sandwiched between the main unit 3 and a position changeable in the main shaft direction.
It consists of a second hook 32 attached to the.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sewing machine having two needles and a shuttle corresponding to each needle.

[0002]

[Prior Art]

 As a two-needle sewing device, a device described in British Patent No. 2188951 shown in FIG. 4 or a device described in US Pat. No. 4,043,283 is already known. For example, the one described in British Patent No. 2188951 has a first needle drive unit 35 to which power is transmitted from the first upper shaft 34 and a second needle drive unit to which power is transmitted from the second upper shaft 36. 37, a first shuttle 39 to which power is transmitted from the first lower shaft 38, and a second shuttle 41 to which power is transmitted from the second lower shaft 40.

In this sewing device, when the sewing width is changed, the positions of the second needle drive portion 37 and the second shuttle 41 are changed according to the sewing width. To do this, first loosen the screw 42 on the second upper shaft 36 and the bolt 44 on the needle drive unit guide 43, slide the second needle drive unit 37 along the guide 43, and then determine the needle position. The joint 45 connecting the bolt 44 and the second upper shaft 36 and the screw 42 thereof are tightened to fix the position of the second needle driving unit 37. Next, the position of the second shuttle 41 is changed in substantially the same manner. Reference numerals 47 and 48 denote screws and joints provided on the third lower shaft 46 for transmitting power to the second lower shaft 40. Further, the cloth feed plate 49 is also replaced according to the sewing width.

[0004]

[Problems to be solved by the device]

 Therefore, in the conventional two-needle sewing device shown in FIG. 4, when changing the sewing width, not only the positions of the second needle drive portion 37 and the second hook 41 are changed, but also the power is transmitted to them. The shafts 36 and 46 for doing this must also be adjusted for expansion and contraction. In other words, there are many adjustment points for changing the sewing width, and a lot of time is required for the change. Further, as can be seen from FIG. 4, since the shuttles 39 and 41 face each other in a narrow space, it is difficult to replace the bobbin case.

An object of the present invention is to provide a two-needle sewing device that can change the sewing width easily and in a short time.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the two-needle sewing device of the present invention is mounted with a position-invariant first needle bar balance mechanism, a corresponding position-invariant first hook, and a main shaft with a key interposed therebetween. 2nd needle bar balance mechanism attached to the upper unit base that has a gear that can change its position in the main axis direction, and a gear that is attached to the counter shaft parallel to the main shaft with a key in between. It consists of a second hook attached to a possible lower unit base.

[0007]

[Work]

 In the two-needle sewing device configured as described above, when the second needle bar balance mechanism and the second hook are moved with respect to the first needle bar balance mechanism and the first hook when the sewing width is changed, The gears that transmit power to the needle bar balance mechanism and the second hook also slide on the main shaft and the auxiliary shaft and move together.

[0008]

【Example】

 The two-needle sewing device of the present invention will be described with reference to FIGS. 1 to 3.

This two-needle sewing device is a sewing machine needle bar balance mechanism A whose position is invariable, a position-invariable hook 26 corresponding to it, and a sewing machine needle bar balance mechanism B whose position can be changed in the direction along the rotary spindle 3. And a shuttle 32 whose position is changeable in the direction along the rotary spindle 3.

The two sets of sewing machine needle bar balance mechanisms A and B respectively include a thrust cradle 7 (balance weight), a balance 8, a needle bar crank 9, a needle bar crank rod 10, a needle bar holder 11 and a needle bar 12. It is constructed and the mechanism itself is well known.

The needle bar balance mechanism A, which is located on the left side and has the needle N1, does not change its position around an axis parallel to the rotary main shaft 3 fixed to the pulley 1 driven by a driving device (not shown). It is configured to be rotatable via gears 4, 5, 6.

A position-changeable needle bar balance mechanism B having a needle N2 is provided with an upper unit base 15 provided with a bevel gear 16 which is slidable on a main shaft 3 with a key 13 interposed therebetween and which is supported for power transmission. Is supported by each of the members, and each member is arranged around an axis that is perpendicular to the rotating main shaft 3. A bevel gear 14 is rotatably attached to the thrust receiving base 7 of the upper unit base 15, while the bevel gear 14 is rotatably attached to the bevel gear 14. Reportedly. Therefore, when the rotary main shaft 3 rotates, the rotation is transmitted from the key 13, the bevel gears 16, 14 to the thrust cradle 7 side, the balance 8 swings, and the needle bar crank 9, needle bar crank rod 10, The needle bar 12 and the needle N2 move up and down via the needle bar holder 11.

Since the bevel gear 16 is supported by the rotary main shaft 3 with the key 13 interposed therebetween, the upper unit base 15 can be moved along the rotary main shaft 3 and the machine frame is fixed by the unit base fixing screw 31. It can be fixed in position 2. Therefore, by loosening the unit base fixing screw 31 from the outside of the sewing machine, sliding the upper unit base 15 having the needle N2 to an arbitrary position along the rotary spindle 3, and then fixing it, the needle N1 and the needle N2 are fixed. The interval, that is, the sewing width can be changed.

The rotation of the rotary main shaft 3 is applied to the counter shaft 22 for driving the two shuttles 26 and 32 through the bevel gear 17, the bevel gear 18, the vertical shaft 19, and the bevel gears 20 and 21 in a predetermined rotation. Transmitted in ratio.

A hook 26 having a position that does not change its position and forms a stitch in association with the needle N1 is attached to the bevel gear 24 fixed to the shaft of the hook 26 by a thrust pedestal 25 that holds the machine frame 2 therebetween. The rotation of the sub shaft 22 is transmitted from the bevel gear 30 fixed to the sub shaft 22. Therefore, the shaft of the shuttle 26 is orthogonal to the auxiliary shaft 22.

A position-changeable hook 32 that forms a stitch in association with the needle N2 is provided with a bevel gear 27 that is slidably supported by the auxiliary shaft 22 with a key 28 interposed therebetween and is capable of transmitting power. The rotation of the auxiliary shaft 22 is transmitted from the bevel gear 27 to a bevel gear 29 which is rotatably attached to the shaft 23 and fixed to the shaft of the shuttle 32. Therefore, the shaft of the shuttle 32 is also orthogonal to the auxiliary shaft 22. Further, the shuttle 26 and the shuttle 32 can be rotated in the same direction (front side) at the same number of rotations as the rotary spindle 3 is rotated.

The lower unit base 23 to which the hook 32 is attached is movable in the direction along the sub shaft 22 with respect to the machine frame 2, and the unit base fixing screw 33 is loosened to move the lower unit base 23 to the sub shaft 22. After sliding the needle N2 to a position corresponding to the position of the needle N2, the position can be fixed to the machine frame 2.

Belts may be used instead of the gears 4, 5, 6 or the bevel gears 17 to 21, respectively, and a crank mechanism is provided on the rotary main shaft 3 so that the auxiliary shaft 22 is operated as a reciprocating half-rotation. It is also possible to change each hook to a half-turn hook instead of the full-turn hook.

[0019]

[Effect of the device]

 Since the present invention is configured as described above, it has the following effects.

That is, one of the needle drive unit and the shuttle drive unit can be moved as one unit, and the positions can be adjusted easily and in a short time by operating them from outside the sewing machine. Therefore, the number of parts to be operated is small, and the sewing width can be changed very easily. Further, since the hooks can be arranged in the same direction in the front, the bobbin can be easily replaced and the working efficiency is improved.

[Brief description of drawings]

FIG. 1 is a top view of a two-needle sewing machine of the present invention.

FIG. 2 is a front view of the two-needle sewing machine of the present invention.

FIG. 3 is a bottom view of the two-needle sewing machine of the present invention.

FIG. 4 is a front view of a conventional two-needle sewing machine.

[Explanation of symbols]

 3 Rotating Spindle (Spindle) 13 Keys 15 Upper Unit Stand 16 Bevel Gears 22 Secondary Shaft 23 Lower Unit Stand 26 Kama (1st Kama) 27 Bevel Gears 28 Keys 32 Kama (2nd Kama) A Sewing Machine Needle Bar Balance Mechanism (1st) Needle bar balance mechanism) B Sewing machine needle bar balance mechanism (2nd needle bar balance mechanism)

Claims (1)

[Scope of utility model registration request] 1. An upper unit base having a position-invariant first needle bar balance mechanism, a corresponding position-invariant first hook, and a gear mounted on a main shaft with a key sandwiched therebetween, the position of which can be changed in the main-axis direction. And a second hook attached to a lower unit stand, which is equipped with a gear attached to a sub shaft parallel to the main shaft with a key sandwiched between them, and which can be repositioned in the main shaft direction. 2 needle sewing machine.