JPH059473U - Upper knife storage device in overlock sewing machine - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the operability and safety of the sewing machine when the upper knife is not used. [Structure] A base end portion of an upper knife 7 is axially installed so as to be capable of reversing displacement within an appropriate angle range via an upper knife reversing bearing 17 formed at an end portion of an upper knife retracting arm 11. The base of the upper knife retracting arm 11 is axially held in a foldable and rotatable manner via a slide rotation bearing 9 formed at the end of the upper knife elevating arm 8 pivotally attached to the upper knife drive shaft 5. In addition, an upper knife cover 29 that is bent to have a substantially U-shaped side surface and that can house the upper knife 7 that has been inverted and held is fixedly provided on one side of the upper knife retracting arm 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention is a modification of the upper knife device of an overlock sewing machine that cuts cloth while sewing. An overlock sewing machine that has good workability and improved workability when the upper knife is not used. It relates to the upper knife storage device.

[0002]

[Prior art]

  Conventionally, the overlock sewing machine is equipped with a cutting knife that cuts the fabric edge while sewing. The upper knife drive method and the lower knife drive method are used. It And in the upper knife drive system, the knife is pivoted above the needle plate at the needle drop part. Therefore, it is not necessary to change the sewing machine needle, thread the thread, or cut the cloth such as double chain stitching. In special sewing, not only the workability is poor because the upper knife interferes, but also during work There was a problem in safety, such as pinching the fingertips.

[0003]   On the other hand, in the lower knife drive system, since the knife is located under the needle plate, The workability and safety at the time of special sewing are good, but the mechanism is complicated and the cost is increased. Not only will it lead to the lower looper, but the operability of the threading work for the lower looper will be sacrificed. Had a problem.

[0004]

[Problems to be solved by the device]

  The present invention has been made in view of the above problems, and a cutting knife driven by an upper knife is provided. Operability of the overlock sewing machine equipped with a sewing machine without using a knife And an upper knife retractor for an overlock sewing machine with excellent safety. It is intended for and.

[0005]

[Means for Solving the Problems]

  The upper knife storage device in the overlock sewing machine according to the present invention is a sewing machine sewing machine. The upper knife that moves up and down in conjunction with the operation carries the upper knife that interferes with the cloth being sewn on the drive shaft. Then, in the upper knife device of the overlock sewing machine that cuts the cloth edge while sewing , The base end of the upper knife is formed on the end of the upper knife retracting arm that is carried on the upper knife drive shaft The upper knife reversing bearing is installed so that it can be reversed and displaced within a predetermined angle range. When used for cutting, it is reversed and held in the retracting direction, and it is fixed to one side of the upper knife retracting arm. The inverted upper knife is housed in the pocket of the upper knife cover that is bent into a substantially U-shaped side shape. The summary is that it is configured as described above.

[0006]   In the above summary, the base of the upper knife retracting arm around which the upper knife is pivotally mounted is The upper knife is mounted on the end of the upper knife lifting arm that is attached to the drive shaft by means of a sliding rotation bearing. It folds along the lifting arm and is pivotally mounted so that it can be swung. The upper knife retracting arm, which holds the upper knife in reverse, is folded and retained by the sliding rotary bearing. It is desirable to have.

[0007]

[Action]

  According to the above configuration, when performing special sewing without using the upper knife, first, The upper knife is reversed and held in the retracted position with respect to the upper knife retracting arm via the rolling bearing, Keep it in the pocket of the cover. In addition, the upper knife retracting arm is slid through a rotation bearing. Thus, it is possible to fold, swivel, and retract with respect to the upper knife lifting arm. By this The worker's safety can be secured.

[0008]

【Example】

  Hereinafter, an embodiment of an upper knife storage device in an overlock sewing machine according to the present invention Will be described with reference to FIGS.

[0009]   Reference numeral 1 is an upper knife device pivotally mounted on the head portion 2 of the overlock sewing machine, In the vicinity of the needle bar 4 with the sewing machine needle 3 fixed at the end, At the lower end of the upper knife drive shaft 5 that is axially installed to drive in the vertical direction (arrow A-A ') Attach the upper knife 7 so that it slides on the upper edge of the lower knife 33. It 6 is a needle plate.

[0010]   Reference numeral 8 indicates that the rear end of the upper knife drive shaft 5 is fixed to the lower end of the upper knife drive shaft 5, and the rear end of the upper knife drive shaft 5 is protruded forward in the cloth feeding direction. And a sliding rotary bearing 9 extending in the horizontal direction at the front end of the lifting arm 8. The upper knife retracting arm 11 is rotated through the upper knife releasing shaft 10 and It is pivoted on the ground.

[0011]   The sliding rotation bearing 9 has an upper knife releasing shaft 10 projecting from one end of an upper knife retracting arm 11. It is rotatably and slidably inserted into the hole 32 and protrudes from the base of the upper knife retracting arm 11. The retreat arm positioning pin 12 that has been installed is fitted in the axial direction, and the two positions of the rotation stop engagement are engaged. The locking notches 13 and 14 are formed in the flange portion around the shaft hole, and the hole of the shaft hole 32 is formed. By the retractable arm support spring 15 mounted elastically between the end and the upper knife releasing shaft 10, the upper knife The release shaft 10 is elastically biased in the direction of arrow B.

[0012]   The retreat arm positioning pin 12 is engaged with any one of the locking notches 13 and 14, While swinging in the range of C-C 'and swinging in the folding direction, the upper member The swinging end of the retractable arm 11 is stored in the pocket 16 formed on the lower surface of the upper knife lifting arm 8. .

[0013]   An upper knife reversing bearing 17 extending in the horizontal direction is provided at the swing end of the upper knife retracting arm 11. The upper knife 7 is configured to be reversible and detachable via the upper knife support shaft 18. It will be connected to. The female attachment end 19 formed at one end of the upper knife support shaft 18 has an upper A female fitting groove 20 for fitting the base of the female knife 7 is formed, and a long hole 21 of the upper knife 7 is inserted. It is fixed to the female mounting end 19 by means of a fastening screw 22.

[0014]   The upper knife support shaft 18 is inserted into the shaft hole 23 so as to be rotatable and axially slidable. At the same time, the upper knife rotation preventing knob 24 provided at the other end of the upper knife reversing bearing 17 is provided. Female support spring, which is mounted between the hole end of the shaft hole 23 and the upper female support shaft 18 25, the upper knife support shaft 18 is elastically biased in the direction of arrow D. And arrow When the upper knife support shaft 18 is in the position of the arrow D after swinging and reversing in the range of E-E ', The upper female anti-rotation pin 26 projecting from the end of the reversing bearing 17 It is engaged with any one of the upper female engaging cutouts 27, 28 formed in the female knob 24.

[0015]   Reference numeral 29 is fixed to the base of the upper knife retracting arm 11 and is located outside the end. An upper female cover that is bent in a U shape from the lower side to the upper side. 9 when the upper knife support shaft 18 is in the position opposite to the arrow D between the upper arm 9 and the arm end of the upper knife retreat arm 11. An upper knife that forms a gap 30 into which the knife 7 enters and that is in a stable position (arrow D) 7 is located in the pocket 31 of the upper female cover 29.

[0016]   As shown in FIG. 1, the upper knife device 1 having the above-mentioned configuration is capable of simultaneously lifting the cloth end and sewing the upper end of the cloth. In the normal use state in which cutting is performed by the lifting operation (arrow A-A ') of the screw 7, the upper knife is used. The retreat arm 11 is slid forward from the pocket 16 of the upper knife lifting arm 8 around the sliding rotation bearing 9. Upper knife reversing bearing 17 so that the upper knife 7 faces the vertical direction. Centering around the upper female cover 29, the mounting posture is determined by turning (arrow E) from the pocket 31. The blade of the upper knife 7 is made to interfere with the cloth to be cut by driving the upper knife drive shaft 5 up and down. Therefore, it is possible to cut from the needle drop position leaving a predetermined seam allowance.

[0017]   Also, replacement of the sewing machine needle 3, threading work, or special sewing such as double chain stitching can be performed on the sewing machine. In the case of performing with, the upper knife 7 of the upper knife device 1 is put in the retracted state and retracted from the vicinity of the needle drop portion. Use tightly.

[0018]   Next, a description will be given with reference to FIGS. First, hold the upper knife rotation stop knob 24 The upper knife support shaft 18 on which the upper knife 7 is fixed, against the knife support spring 25. And slide it in the direction opposite to arrow D. As a result of this sliding, The female detent pin 26 comes off. Then, as shown in FIG. The upper knife 7 is swung from the gap 30 into the pocket 31 of the upper knife cover 29 by rotating the knob 24 ( Arrow E '), and by the elasticity of the female support spring 25, the detent pin 26 is moved. The other upper knife locking notch 28 is engaged.

[0019]   In this state, the upper knife 7 is reversed and retracted, and is housed in the pocket 31 of the upper knife cover 29. However, when further retracting, the upper knife retracting arm is resisted against the retracting arm supporting spring 15. While holding 11, slide the upper knife release shaft 10 in the direction opposite to the arrow B direction. And the locking notch 1 3 with the backward arm positioning pin 12 released, the upper knife backward arm 11 is moved to the arrow C '. Swivel in the direction, and store the end of the upper knife 7 on the pivot side in the pocket 16 of the upper knife lifting arm 8. It (See Figure 5)

[0020]   In the retracted state, the upper knife lifting arm is located at the needle drop point of the overlock sewing machine. Since the sliding rotation bearing 9 of 8 comes to project to the front side most, The work space around the needle drop part becomes wider, and the upper knife device 1 can pinch or hurt your palm. Workability at the time of special sewing can be ensured.

[0021]   In the above embodiment, the upper knife drive shaft 5 is slidably mounted on the end of the upper knife lifting arm 8. After the upper knife retreating arm 11 is pivotally pivoted through the dynamic bearing 9 and the upper knife 7 is folded. Although the retracting structure is shown, in the present invention, the upper knife 7 is formed by the upper knife reversing bearing 17. It is pivotally installed so that it can be reversed and retracted. Even with that structure alone, the upper female cover 29 The safety of workers can be secured. Therefore, the upper knife lifting arm 8 and the upper knife retract The arm 11 may be composed of one non-foldable part to achieve the object of the present invention. be able to.

[0022]

[Effect of device]

  As described above, the upper knife storage device in the overlock sewing machine according to the present invention is As for the table, the upper knife in the retracted state will be stored in the pocket of the upper knife cover. It has the feature that it can ensure the safety of the user. The practical effect of is extremely large.

[Brief description of drawings]

FIG. 1 is a side view of an upper knife storage device according to an embodiment of the present invention in a state of using an upper knife, which is a main part of an overlock sewing machine including an upper knife device.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is an exploded perspective view of the same knife device.

FIG. 4 is a side view (a) and a front view (b) in a state where an upper knife is reversed.

FIG. 5 is a side view showing a state in which an upper knife retracting arm is folded.

[Explanation of symbols]

1 Upper knife device 5 Upper knife drive shaft 7 Upper female 8 Upper knife lifting arm 9 Sliding rotation bearing 10 Upper female release axis 11 Upper knife retracted arm 12 Retreat arm positioning pin 15 Reverse arm support spring 17 Upper knife inversion bearing 18 Upper knife support shaft 20 female fitting groove 22 Fastening screw 24 Upper knife rotation stop pick 25 female support spring 26 Upper knife rotation stop pin 29 Upper female cover

Claims (2)

[Scope of utility model registration request] 1. An upper knife device for an overlock sewing machine, which carries an upper knife that interferes with the cloth being sewn on an upper knife drive shaft that is moved up and down in conjunction with the sewing operation of the sewing machine, and cuts the cloth end while sewing. In, through the upper knife reversing bearing formed at the end of the upper knife retreating arm carrying the base end of the upper knife on the upper knife drive shaft, it is axially arranged so as to be capable of reversing displacement within a predetermined angle range, It is configured to hold the inverted upper knife in the pocket of the upper knife cover which is fixed to one side of the upper knife retreat arm and is bent to a substantially U-shaped side shape when not cut and used while being reversed and retained. Upper knife storage device in overlock sewing machine characterized by. 2. The upper knife retracting device in the overlock sewing machine according to claim 1, wherein the base of the upper knife retreating arm around which the upper knife is pivotally mounted is mounted on an upper knife drive shaft to lift the upper knife. An upper knife retracts in which the upper knife is reversibly held via the upper knife reversing bearing, which is axially provided so as to be foldable and rotatable along the upper knife lifting arm through a sliding rotation bearing formed at the end of the arm. An upper knife storage device in an overlock sewing machine, characterized in that an arm is folded and held backward through the sliding rotation bearing.