JP5331923B2 - Delivery arm type sewing machine - Google Patents

Description

  The present invention employs a feeding arm type cylinder that makes it easy to sew round and tubular items, and stitches the upper fabric edge and the upper and lower fabric edges together to sew together, so that the briefs can be placed in front and the shorts can be sewn Alternatively, the present invention relates to an improvement of a delivery arm type sewing machine that is optimal for a shoulder joint of a T-shirt.

Conventionally, as this type of delivery arm type sewing machine, for example, as shown in FIGS. 10 and 11, an opening (bow-shaped groove) formed by a needle thread reel (L-shaped member) 40 in a front cover 41 a on the front side of the head 41 is used. A connecting shaft 46 that protrudes outward of the head 41 through the hole 42 and swings a spreader and a movable knife (blade) (not shown) is formed through the opening 47 formed in the rear cover 41b on the back side of the head 41. Some are connected to 48 eccentric portions 49 (see Patent Document 1).
As an invention for improving the drive mechanism of the spreader and movable knife, as shown in FIGS. 12 and 13, the drive source of the spreader and the drive mechanism of the movable knife are separated, and the presser foot is raised by a foot pedal or the like. There is one that reduces the load when it is performed (see Patent Document 2).

Japanese Patent Publication No. 30-5835 (in particular, see FIGS. 2 and 5) U.S. Pat. No. 2,914,009 (in particular, see FIGS. 1 and 3)

However, in the delivery arm type sewing machine of the invention described in the above-mentioned Patent Document 1, when oil is continuously supplied in the head 41 during driving, oil leakage occurs from the opening 42, and the cloth on the cylinder and the vicinity of the needle thread reel 40 are located. There was a problem that the needle thread became dirty.
Further, in the delivery arm type sewing machine of the invention described in Patent Document 2, the yoke 50 of the drive mechanism of the movable knife has a structure protruding outward from the opening 52 formed in the lateral cover 51a of the head 51. Even in this case, there is a problem that oil leakage occurs from the opening 52 when the inside of the head 51 is refueled.
However, if these openings 42 and 52 are closed with a cover member or the like separate from the side walls of the heads 41 and 51, the number of members and assembly man-hours increase, and the structure becomes complicated.

Accordingly, the present invention has been made to solve the above problems, and provides a delivery arm type sewing machine that can prevent oil leakage from the side wall of the head while simplifying the outer wall structure of the head and reducing the cost. Aim to do.

The delivery arm type sewing machine according to the present invention will be described with reference to the reference numerals in FIGS. 1 to 9 for easy understanding of the contents of the invention. A bed (2) extending to the bed, a head (3) connected to the bed (2), an upper shaft (4) rotatably supported by the bed (2), and a head (3) A presser foot (16) arranged on a needle plate (13) of the cylinder (1) and provided with a fixed knife (30), which is moved up and down in synchronization with the sliding of the needle bar (10). ), A spreader (24) that moves left and right above the presser foot (16), and a movable arm (27) that moves forward and backward toward the fixed knife (30) of the presser foot (16). In the sewing machine, a first boss (2b) and a second boss (2c) formed at a predetermined interval on the bed (2). , A swing shaft (6) that swings about the axis in conjunction with the rotation of the upper shaft (4), a presser shaft (15) with a presser foot (16) fixed to the lower end, and a presser shaft ( 15) A spreader guide shaft (21a) arranged coaxially with the spreader (24) and a movable knife connected coaxially with the presser shaft (15) and connected to the movable knife (27). The guide shaft (21b) is connected to the spreader guide shaft (21a) in the head (3), and the spreader guide shaft (21a) is rotated around the presser shaft (15) in conjunction with the rotation of the upper shaft (4). And a spreader linkage (28a) that swings to the side, and the head (3) has a side wall comprising a front cover (3a), a rear cover (3c), and a lateral cover (3d), and a lower edge of the side wall. and a lower wall (3b) connected to the side walls of the head is closed of, for spreader The inner shaft (21a), the movable knife guide shaft (21b), and the presser shaft (15) have a spreader guide shaft (21a) formed in a cylindrical shape and are fitted into the presser shaft (15) to guide the movable knife. The shaft (21b) is formed in a cylindrical shape having a larger diameter than the spreader guide shaft (21a) and has a triple shaft structure that is fitted on the outer periphery of the spreader guide shaft (21a). The end of the swing shaft (6) supported by the second boss (2c) is inserted into the drilled first circular hole (3bb) and covered with the side wall, and the bed (2) The needle thread reel (14) is fixed to the projecting end (6a).

  According to the present invention, the spreader guide shaft, the movable knife guide shaft and the presser shaft have a triple shaft structure, and the needle thread reel is supported by the second boss of the swing shaft and protrudes outward from the outer wall of the bed. Since it is fixed to the protruding end portion, the side wall of the head can be sealed (closed) without partially opening the side wall as in the prior art.

  Thus, the side wall of the head can be simplified and hermetically sealed, so that there is an advantage that the cloth on the cylinder and the needle thread near the needle thread reel can be prevented from being soiled with oil.

1 is an external perspective view of a delivery arm type sewing machine according to an embodiment of the present invention. It is a cross-sectional plan view of the head of the sewing machine. It is a rear view which shows the assembly state of a presser shaft, a spreader guide shaft, a movable knife guide shaft, a spreader and a movable knife. It is the sectional view on the AA line in FIG. It is a disassembled perspective view of the guide shaft for spreaders, the guide shaft for movable knifes, and a movable knife. It is a disassembled perspective view of a presser shaft, a spreader, and a presser foot. It is a disassembled perspective view of a presser shaft, a presser foot, and a presser lifting lever. It is a disassembled perspective view of a needle bar, a needle bar link member, a swing shaft, a bell crank lever, and a rod. It is a fragmentary sectional view showing a lower seal state of a presser shaft, a spreader guide shaft, and a movable knife guide shaft. It is a cross-sectional plan view of a sewing machine head of a conventional delivery arm type sewing machine. FIG. 11 is a front view of the sewing machine head as viewed from an arrow B in FIG. 10. It is a cross-sectional top view of the sewing machine head of the delivery arm type sewing machine of another conventional example. FIG. 13 is a schematic longitudinal sectional view showing a presser mechanism arranged on the head of the sewing machine in FIG. 12 and its peripheral configuration.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the drawings.

  As shown in FIGS. 1 and 2, the cylinder 1 is formed in a delivery arm shape extending along the material feeding direction X, and a bed 2 is erected on the base end side of the cylinder 1, and the bed 2 is a cylinder. It is comprised so that it may extend horizontally in the direction which cross | intersects one extending direction. A head 3 is connected to the tip of the bed 2 so as to extend upward on the tip side of the cylinder 1. The head 3 includes a side wall including a front cover 3a, a rear cover 3c, and a lateral cover 3d. The rear cover 3 c is arranged along the front end of the bed 2, and its end is connected to the head 3. The front cover 3 a is disposed so as to face the rear cover 3 c, and its end is connected to the head 3. The lateral cover 3d is disposed so as to contact the edges of the front cover 3a and the rear cover 3c, and the joint between the front cover 3a and the lateral cover 3d is reinforced by a column 3e of the head 3. A lower wall 3b is connected to the lower end edge of the side wall, and an upper wall is connected to the upper end edge of the side wall.

  As shown in FIG. 2, an upper shaft 4 is disposed in the bed 2 along the extending direction of the bed 2, and one end portion of the upper shaft 4 protrudes out of the bed 2. A drive belt pulley 5 is provided. A swing shaft 6 is horizontally disposed in the head 3, and the upper shaft 4 and the swing shaft 6 are parallel to each other. The swing shaft 6 is supported by a bush 6f of the first boss 2b and a bush 6e of the second boss 2c formed on the bed 2, and a bell crank lever 7 as shown in FIG. Is fixed. One end of the bell crank lever 7 is connected to a rod 9 connected to an eccentric portion 8 provided on the upper shaft 4, and the other end is connected to a needle bar link member 11 (see FIG. 8) attached to the needle bar 10. Yes. The swing shaft 6 swings in conjunction with the upper shaft 4, and this swing is transmitted to the bell crank lever 7 and the needle bar link member 11 so that the needle bar 10 moves up and down. In FIG. 8, 12 is a needle and 13 is a needle plate.

  As shown in FIGS. 1 and 2, the head 3 is provided with a needle thread reel 14 that moves up and down around the swing shaft 6 in conjunction with the swing shaft 6. In this case, one end portion 6a of the swing shaft 6 protrudes outward from the outer wall 2a on the front side of the bed 2, and a needle thread reel 14 is fixed to the protruding end portion 6a. An annular seal 3aa is disposed so as to cover the bush 6e, and oil leakage from the end of the bush 6e of the second boss 2c is more reliably prevented. By fixing the needle thread reel 14 to the protruding end 6a of the swinging shaft 6 protruding outward from the outer wall 2a of the bed 2 in this way, the front cover 3a on the front side of the head 3 has the front cover 3a shown in FIG. Unlike the front cover 41a of the conventional head 41 shown in FIG. 11, it is not necessary to form the opening 42 for projecting the needle thread reel 40, so that the front cover 3a of the head 3 can be sealed.

2 to 3 and 6, a presser shaft 15 is vertically arranged in the head 3, and a lower end portion 15 a of the presser shaft 15 is a first circular hole formed in the lower wall 3 b of the head 3. It protrudes downward from 3bb, and a presser foot 16 is provided at the protruding lower end 15a. A fixing knife 30 is attached to the presser foot 16.
As shown in FIGS. 2 and 7, a presser foot lifting lever 17 having a shaft portion 17a is supported in the head 3 so as to be rotatable around the shaft portion 17a, and a base end of the shaft portion 17a is formed in the rear cover 3c. It protrudes outside through a ring-shaped seal 3cc arranged in the provided second circular hole 3c1. The ring-shaped seal 3cc further prevents oil leakage from the second circular hole 3c1. As the presser lift lever 17 rotates, its tip 17b engages with the collar 18 fixed to the presser shaft 15 from below, and at this time the presser shaft 15 is raised to raise the presser foot 16 above the cylinder 1. Move away.

  The arm 31 is fixed to the protruding end portion (base end) of the shaft portion 17 a of the presser lift lever 17 shown in FIG. 7, and the presser lift lever operating linkage 19 is connected to the arm 31. As shown in FIGS. 3 to 5, the guide shaft 21 fitted on the presser shaft 15 coaxially is separated into a spreader guide shaft 21a and a movable knife guide shaft 21b. The guide shaft 21b and the presser shaft 15 have a triple shaft structure. The spreader guide shaft 21a has an operating piece 21aa at the lower end (see FIG. 5), and the operating piece 21aa is inserted into the recess 23aa of the transmission member 23a rotatably supported by the presser shaft 15 (FIG. 4, FIG. 4). (See FIG. 6). As shown in FIG. 6, the transmission member 23 a is connected to the spreader support shaft 22 via a spreader connection member 23 b, and the spreader support shaft 22 is inserted into a support hole 16 a drilled in the base of the presser foot 16. A spreader 24 is attached to the lower end of the spreader support shaft 22.

  As shown in FIG. 5, the movable knife guide shaft 21b has a fixed piece 21b1 at the lower end, and the movable knife connecting member 26 is attached to the fixed piece 21b1. A movable knife support shaft 25 is slidably supported on the movable knife connecting member 26 through a pair of upper and lower support holes 26 a, 26 a, and is attached to a locking piece 25 a attached to the movable knife support shaft 25. A spring 25b interposed between the support holes 26a and 26a is biased. A movable knife 27 is attached to the lower end of the movable knife support shaft 25. The left and right movements of the spreader 24 and the movable knife 27 are performed near the presser foot 16 when the sewing machine is driven. The movable knife 27 moves forward and backward toward the fixed knife 30 of the presser foot 16.

  Further, as the linkage 28 for swinging the spreader guide shaft 21a and the movable knife guide shaft 21b around the presser shaft 15 in conjunction with the rotation of the upper shaft 4, the spreader linkage 28a and the movable knife linkage are provided. 28b is provided. As shown in FIGS. 2 and 5, an operating piece 21a1 is fixed to the upper end of the spreader guide shaft 21a by a screw 21a2, and a ball joint 21a3 is attached to the tip of the operating piece 21a1. In the head 3, the ball joint 21 a 3 of the spreader guide shaft 21 a and the spreader eccentric part (not shown) of the upper shaft 4 are connected by the spreader linkage 28 a, and the spreader guide is rotated as the upper shaft 4 rotates. The shaft 21a is swung around the presser shaft 15. On the other hand, as shown in FIGS. 2, 3, and 5, an operating piece 21b2 is fixed to the upper end of the movable knife guide shaft 21b by a screw 21b3, and a ball joint 21b4 is attached to the tip of the operating piece 21b2. As shown in FIGS. 2 and 8, the other end of the swing shaft 6 protrudes from the first boss 2b toward the rear cover 3c, and a ball joint 6c is attached to an arm 6b fixed to the protruding end. . The ball joint 6c and the ball joint 21b4 of the operating piece 21b2 protruding from the upper end of the movable knife guide shaft 21b toward the rear cover 3c are connected by a movable knife linkage 28b. The movable knife guide shaft 21b is swung around the presser shaft 15 as it moves. The rear cover 3c is provided with an upper cover connected to the upper wall and a lower cover connected to the lower wall 3b, and these covers are arranged vertically on both sides of the connecting portion of the movable knife linkage 28b on the arm 6b side. Is located. Therefore, the movable knife linkage 28b is substantially disposed between the first boss 2b and the rear cover 3c in the head 3.

  Thus, in the head 3, the other end of the swing shaft 6 (ball joint 6 c of the arm 6 b) is connected to the other end of the movable knife linkage 28 b (ball joint 21 b 4 of the operating piece 21 b 2), By connecting the other end of the spreader linkage 28a to the spreader eccentric part (not shown) of the upper shaft 4, as shown in FIG. Since there is no need to form the opening 47 as in the rear cover 41b on the back side of the conventional head 41 shown in FIG. 10 and the rear cover 41b on the side surface side of the head 51 shown in FIGS. The rear cover 3c can be closed by simplifying the structure.

  As shown in FIGS. 3 and 4, the spreader guide shaft 21a, the movable knife guide shaft 21b, and the presser shaft 15 are formed such that the spreader guide shaft 21a is formed in a cylindrical shape and is inserted into the presser shaft 15 so as to be movable. The female guide shaft 21b is formed in a cylindrical shape having a diameter larger than that of the spreader guide shaft 21a, and has a triple shaft structure that is inserted into the outer periphery of the spreader guide shaft 21a. The spreader guide shaft 21a, the movable knife guide shaft 21b and the presser shaft 15 are inserted into a circular hole 3bb formed in the lower wall 3b, and the movable knife guide shaft 21b is a bearing fixed to the circular hole 3bb. 29 is supported. In this way, the spreader guide shaft 21a, the movable knife guide shaft 21b, and the presser shaft 15 in the head 3 have a triple shaft structure, so that the lateral cover 3d on the side surface side of the head 3 is placed on the side cover 3d as shown in FIG. Since it is not necessary to form the opening 52 like the side cover 51a of the head 51 shown in FIGS. 12 and 13, the side cover 3d of the head 3 can be closed with a simple structure. As shown in FIG. 9, a recess is formed around the hole for the presser shaft 15 at the lower end of the spreader guide shaft 21a, and a ring-shaped oil seal 21c is embedded in the recess. Recesses are also formed around the guide shaft 21a hole at the lower end of the movable knife guide shaft 21b and around the guide shaft 21b hole at the lower end of the bearing 29, and annular oil seals 21d and 21e are embedded in the recess. By providing these ring-shaped oil seals 21c, 21d, and 21e, oil leakage from the triple shaft structure is more reliably prevented.

  As described above, the spreader guide shaft 21a, the movable knife guide shaft 21b and the presser shaft 15 have a triple shaft structure, and the needle thread reel 14 is supported by the second boss 2c of the swing shaft 6 and the bed. 2 is fixed to the projecting end portion 6a projecting outward from the outer wall 2, so that the side walls (front cover 3 a, rear cover 3 c, side cover 3 d) of the head 3 are not partially opened as in the prior art. Since it can be simplified and closed, the cloth on the cylinder 1 and the needle thread near the needle thread reel 14 can be well prevented from being soiled with oil.

DESCRIPTION OF SYMBOLS 1 Cylinder 2 Bed 2c 2nd boss 3 Head 3a Front cover 3b Lower wall 3bb 1st circular hole 3c Rear cover 3d Lateral cover 4 Upper shaft 6 Oscillating shaft 6a Projection end 6b Arm 10 Needle bar 13 Needle plate 14 Needle thread reel Tool 15 Presser shaft 16 Presser foot 19 Presser lifting lever operating linkage 21a Spreader guide shaft 21b Movable knife guide shaft 21b2 Actuating piece 24 Spreader 27 Movable knife 28a Spreader linkage 30 Fixed knife

Claims (1)

A bed extending from the base end of the cylinder and extending horizontally;
A head connected to the bed;
An upper shaft rotatably supported by the bed;
A needle thread reel that moves up and down in synchronization with the sliding of the needle bar disposed on the head;
A presser foot arranged on the needle plate of the cylinder and provided with a fixed knife;
A spreader that moves left and right above the presser foot;
In the delivery arm type sewing machine comprising a movable knife that moves forward and backward toward the fixed knife of the presser foot,
A swing shaft supported by a first boss and a second boss formed on the bed at a predetermined interval and swinging about an axis in conjunction with rotation of the upper shaft;
A presser shaft with the presser foot fixed to the lower end;
A spreader guide shaft disposed coaxially with the presser shaft and connected to the spreader;
A movable knife guide shaft disposed coaxially with the presser shaft and connected to the movable knife;
A spreader linkage that is connected to the spreader guide shaft within the head and swings the spreader guide shaft about the presser shaft in conjunction with rotation of the upper shaft;
With
The head has a side wall composed of a front cover, a rear cover, and a lateral cover, and a lower wall connected to a lower end edge of the side wall,
The side wall of the head is sealed,
The spreader guide shaft, the movable knife guide shaft, and the presser shaft have a spreader guide shaft formed in a cylindrical shape and fitted into the presser shaft, and the movable knife guide shaft has a larger diameter than the spreader guide shaft. Is formed in a cylindrical shape and has a triple shaft structure that is fitted on the outer periphery of the spreader guide shaft, is inserted through a first circular hole formed in the lower wall, and is covered by the side wall. ,
The delivery arm type sewing machine characterized in that an end portion of the swing shaft supported by the second boss projects from an outer wall of the bed, and the needle thread reel is fixed to the projecting end portion.

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