JP2006102289A - Cutter attached to sewing machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cutter attached to a sewing machine of which the mechanism is simple, the number of parts is small, the maintenance and security operations are simple, and to enable the cutter to be simply attached to an already used sewing machine. <P>SOLUTION: The vertical movement of a needle bar Pb is transmitted to a lever 16 through a link 15, and an intermediate rod 20 is connected with the working point of the lever 16. A vertically moving rod 23 is connected with the output end of the intermediate rod 20, and a rocking blade 26 is connected with the output end of the vertically moving rod 23. In a track which is formed on the back surface of the intermediate rod 20, a sliding rod to which a fixed blade 33 is attached is fitted, and an operation lever 12 is rockably attached to the shaft of the fulcrum of a supporting piece 32 which is attached to the sliding rod. On the lower end of the operation lever 12, an operation tab 13 is provided, and a means which engages/disengages the connection between the intermediate rod 20 and the vertically moving rod 23 is provided at the upper section. The rocking blade 26 and the fixed blade 33 are connected with a pin P, and the lower end of the vertically moving rod 23 is urged to the sliding rod 31 side by a plate spring. Then, an operation lever supporting member 11 is attached to a supporting disk C to form this cutter attached to the sewing machine. The cutter section can be housed in the sewing machine head or pulled out by the operation of the operation lever 12. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a cutter attached to a sewing machine, which has a very simple mechanism and handling, and can be easily attached to a sewing machine.

  There are the following as prior arts related to the cutter attached to the sewing machine.

JP 2002-018170 A (summary and drawing)

JP 2002-126386 A (summary and drawings)

JP 2003-126579 A (summary and drawings)

  The prior art according to the above-mentioned patent document is such that the rotary shaft of the sewing machine body is converted into a vertical motion through a motion conversion mechanism, and the knife (cutter) drive unit is moved via the clutch by the converted motion. When the knife (cutter) is not used, the clutch drive part is flipped up at the clutch, and when used, the knife (cutter) drive part is made vertical and the positioning projections (on the needle plate) (Provided) It was structured to be fitted into the positioning recess.

  Further, because of the above structure, the mechanism is complicated, the number of parts is large, maintenance / maintenance is difficult, handling operation is complicated, and it is practically impossible to attach a cutter to the sewing machine.

  SUMMARY OF THE INVENTION In view of the above-mentioned problems of the prior art, the present invention provides a sewing machine-attached cutter that has a simple mechanism, has a small number of parts, is easy to maintain and maintain, is extremely easy to handle, and can be easily attached to a sewing machine. This is the issue.

  In order to solve the above-described problems, the present invention includes a link that transmits the vertical movement of the needle bar to the lever, a lever that is swingable about a fulcrum formed on the support plate by the vertical movement transmitted by the link, An intermediate rod connected to the operating point of the lever, a vertically moving rod detachably connected to the output end of the intermediate rod, a swinging blade having a force point connected to the output end of the vertically moving rod, and the intermediate rod A slide rod that is inserted into a track formed on the back surface and can be slid up and down and has a fixed blade attached to the lower end, and a support piece is attached to the upper part of the slide rod where the fixed blade is attached. An operating lever provided with an operating knob at the lower end and a means for engaging / disengaging the connection between the intermediate rod and the vertically moving rod at the lower end, the swinging blade and the fixed blade, Are connected at the fulcrum, A cutter mechanism comprising: a leaf spring attached to a piece for urging the lower end of the vertically moving rod toward the sliding rod; and an operating lever support member for receiving the operating lever attached to a support panel, the operating lever The vertical movement rod and the sliding rod can be accommodated or pulled out from the sewing head together with the operation lever by operating (Claim 1), and the means for engaging / disengaging the connection between the intermediate rod and the vertical movement rod is: The operation lever is urged toward the sliding rod by the torsion spring fitted to the upper screw of the support piece, and the upper end of the vertical movement rod is urged to the intermediate rod by the torsion spring fitted to the upper screw of the operation lever. When the lower end of the control lever is picked against the bias of the torsion springs, the connection between the intermediate rod and the vertical movement rod is released, and the The support plate for supporting the cutter mechanism has an inverted L shape from the upper part of the frame head of the sewing machine to the work side, and the upper end of the support plate. Is bent 90 degrees and screwed to the back of the upper surface of the presser bar support frame, and the lower end is bent 90 degrees and screwed to the needle bar bracket portion at the lower end of the presser bar support frame. It is what.

  According to the present invention configured as described above, the mechanism is simple, the number of parts is small, the maintenance and maintenance are easy, the handling operation is extremely simple, and the cutter can be easily attached to the sewing machine.

  Next, embodiments of the present invention will be described with reference to the drawings. As shown in FIG. 1, the frame head F of the sewing machine M includes a presser bar support frame A, a needle bar support member B supported by a bracket (not shown) extending from the presser bar support frame A, and a support for the cutter mechanism 10. A board C is attached, and a presser bar Pa is fitted to the presser bar support frame A, and a needle bar Pb is fitted to the needle bar support member B so as to be slidable up and down.

  As shown in FIGS. 1 to 5, the support member 11 of the operation lever 12 is screwed to the support plate C of the cutter mechanism 10 by a 90-degree bent portion 11 a, and the operation lever 12 is attached to the support member 11. The operation knob 13 is mounted on the lower end of the operation lever 12.

  On the other hand, a connecting point 14 is formed in the middle of the needle bar Pb, and the lower end of the connecting link 15 is connected to the connecting point 14 via a screw. The upper end of the connecting link 15 is connected to the force point of the lever 16 with a pin 17. The other end of the lever 16 is swingably fitted to a pin 18 implanted in the support plate C, and the upper end of the intermediate rod 20 is inserted into a long hole 19 formed in the middle of the lever 16. The passive pin 21 planted in is fitted. Here, as shown in FIG. 7, an arc-shaped long hole 19 x may be formed in the intermediate rod 20, and a pin 21 x may be implanted at the operating point of the lever 16.

  The connecting pin 22 planted at the lower end of the intermediate rod 20 fits into a long hole 24 formed in the upper end 90-degree bent portion 23a of the up-and-down rod 23, and the lower end 90-degree bent portion 23b of the up-and-down rod 23 A short pin 25 is embedded, and this pin 25 is fitted in a power point hole 27 of the swing blade 26. A long hole may be formed instead of the connecting pin of the intermediate rod 20, and the connecting pin 22 may be provided instead of the long hole at the upper end of the vertical movement rod 23.

  The vertically moving rod 23 connected as described above is accommodated in the pocket of the operation lever 12 and is prevented from falling off by the knock pin 45 planted below the support plate C. The intermediate rod 20 is formed on the support plate C. It fits in the track 28 and can slide up and down.

  A small piece 29 is fixed to the back of the upper end of the intermediate rod 20 to form a track 30 for a sliding rod, and the upper narrow portion 31a of the sliding rod 31 is fitted into the track 30 so that it can slide up and down. The lower 90-degree bent portion 32b of the support piece 32 is screwed to the lower upper side of the sliding rod 31.

  A fixed blade main body 33 is screwed to the lower side of the sliding rod 31, and the fulcrum and the fulcrum P of the oscillating blade 26 are slidably clamped, and fixed to the front end of the fixed blade main body 33. 34 is mounted. Further, a leaf spring 44 is screwed to the upper 90-degree bent portion 32a of the support piece 32, and the lower 90-degree bent portion 23b of the vertical movement rod 23 is urged toward the sliding rod 31 to align the cutter blades. Have good. The number of leaf springs 44 can be plural in order to adjust the biasing force.

  The support piece 32 attached to the upper side of the lower end fixed blade of the sliding rod 31 enters the pocket of the operation lever 12, aligns the hole of the support piece 32 and the hole of the operation lever 12, and controls the operation lever 12. The torsion spring 38 is fitted to the screw 37 above the support piece 32, and the operating end abuts against the headed pin 39 in the middle of the operation lever 12 so that the upper part of the operation lever 12 is connected to the intermediate rod. 20 to the connecting pin 22, and a torsion spring 40 is fitted to the headed pin 39 in the middle of the operation lever 12, and its working end is brought into contact with the upper end bending portion 23 c of the vertical movement rod to apply the same. It is fast.

  A fixing pin 41 is planted on the upper portion of the operation lever 12, and the fixing pin 41 is fitted into notches 42 a and 42 b formed on the upper and lower edges of the support member 11 of the operation lever 12. The notch has a shallow upper side 42a and a deeper lower side 42b.

  The slide rod 31 integrated with the operation lever 12 through the support piece 32 slides up and down along the track 30 formed on the back surface of the intermediate rod 20, and the operation knob 13 and the fixed knob 34 are moved to the torsion spring. When picked against 38, 40, the upper side of the operation lever 12 opens with the heel 36 as a fulcrum, the fixing pin 41 is disengaged from the notch 42b, and the latch 43 formed on the upper end of the operation lever 12 moves up and down. The bent portion 23c of the rod 23 is lifted to disengage the connecting pin 22 of the intermediate rod 20 and the long hole 24 of the vertically moving rod 23 so that the sliding rod 31 to which the fixed blade is attached and the vertically moving to which the swing blade is attached. The rod 23 is slidable together with the operation lever 12 and is stored in the sewing head.

  When the operation knob 13 and the fixed knob 34 are released in this state, the fixing pin 41 is fitted into the upper notch 42a and the stored state is maintained.

  Contrary to the above operation, when the operation knob 13 and the fixed knob 34 are picked and the fixing pin 41 is removed from the notch 42a and pulled down in this state, the sliding rod 31 and the vertical movement rod are lowered together with the operation lever 12 and the connecting pin 22 is long. The holes 24 fit into each other, and the protrusions 33b fit into the holes Ja in the needle plate J, so that the cutter is activated.

  In addition, as shown in FIG. 7, a short arm R urged by a torsion spring S is provided on the vertical rod 23 as shown in FIG. The latch T and the knock pin U formed in the above can be engaged and disengaged.

  Further, as shown in FIG. 8, the operation lever 12 is provided with a reverse V-shaped long hole V on the support member 11 side as shown in FIG. 8 to show the engagement / disengagement between the fixing pin 41 of the operation lever 12 and the notches 42a and 42b of the operation lever support member. It can also be set as the structure which implants the fixing pin W. FIG.

  FIG. 5 illustrates the operation of the cutter. When the needle bar Pb is lifted, the link 15 is lifted as shown in FIG. 5A, and the lever 16 swings upward about the pin 18 and fits into the long hole 19. The passive pin 21 is lifted, the intermediate rod 20 is raised, and the vertically moving rod 23 is lifted because the elongated hole 24 and the connecting pin 22 are fitted together, and the lower end of the vertically moving rod 23 is a pin 25 and a swing blade 26. The power point is raised and the blade opens with the pin P as an axis. FIG. 5B shows a case where the needle bar Pb is lowered, and its operation is the reverse of FIG. By repeating the above operation, the edge of the sewn cloth is cut. Further, the gap between the long hole 24 and the connecting pin 22 is for absorbing the difference between the stroke of the needle bar Pb and the stroke of the power point of the oscillating blade.

  As described above, according to the present invention, the structure is simple, the number of parts is reduced, the cost can be reduced, the operation is simple, the maintenance and maintenance are easy, and the cutter can be easily cut even on a ready-made or in-use sewing machine. The industrial utility value is extremely high.

Front view of the cutter with sewing machine of the present invention Exploded view of the parts 1 arrow view Same side view In the operation explanatory diagram, (a) the cutter is opened, and (b) the cutter is closed. Perspective view of the whole sewing machine Explanatory drawing of other connection examples of intermediate rod and vertical movement rod Explanatory drawing of other fitting examples of operation lever fixing pin and support member notch

Explanation of symbols

10 Cutter mechanism 11 Support member (of operation lever)
12 Operation lever 13 Operation knob 14 Connection point 15 Connection link 16 Lever 17 Pin (Lever's force point)
18 pin (lever fulcrum)
19 Long hole 19x Arc-shaped long hole 20 Intermediate rod 21 Passive pin 21x Pin 22 Connection pin 23 Vertical movement rod 24 Connection long hole 25 Short pin 26 Oscillating blade 27 Power point hole 28 Track (of intermediate rod)
29 Small piece 30 Track (sliding rod)
31 Slide rod 32 Support piece 33 Fixed blade body 33a Blade 33b Protrusion 34 Fixed knob 36 鋲 37 Screw (on the upper part of the support piece)
38, 40 Torsion spring 39 Headed pin 41 Fixing pin 42a, 42b Notch 43 Latch 44 Plate spring 45 Knock pin A Presser bar support frame B Needle bar support member C Support plate D Spring E Top F Frame head G Presser bar operation lever H Presser Plate I Color J Needle plate Ja Hole P Pin R Short arm S Torsion spring T Latch U Knock pin V Long hole W Fixed pin

Claims (3)

  A link that transmits the vertical movement of the needle bar to the lever, a lever that can swing around a fulcrum formed on the support plate that receives the vertical movement transmitted by the link, an intermediate rod that is connected to the operating point of the lever, A vertically moving rod detachably connected to the output end of the intermediate rod, a swinging blade having a power point connected to the output end of the vertically moving rod, and a track formed on the back surface of the intermediate rod are inserted and moved vertically. A sliding rod that is slidable and has a fixed blade attached to the lower end, and a support piece is attached to the upper part of the sliding rod where the fixed blade is attached, and a fulcrum formed on the support piece is pivotally attached to the shaft. An operation lever provided with an operation knob at the lower end and a means for engaging / disengaging the connection between the intermediate rod and the vertical movement rod at the upper portion, and the swinging blade and the fixed blade are connected at a fulcrum thereof, and the support piece Attached to the above vertical movement rod A cutter mechanism comprising a leaf spring for urging the lower end toward the sliding rod and an operating lever support member for receiving the operating lever attached to the support panel. The cutter mechanism moves up and down together with the operating lever by operating the operating lever. A cutter with a sewing machine that allows rods and sliding rods to be stored in or pulled out of the machine head.   The means for engaging / disengaging the connection between the intermediate rod and the vertical movement rod is that the operation lever is urged toward the sliding rod by the torsion spring fitted to the screw at the top of the support piece, and the torsion fitted to the upper screw of the operation lever. When the upper end of the vertical movement rod is urged by the spring toward the intermediate rod, and the lower end knob of the operating lever is picked against the urging of the two torsion springs, the connection between the intermediate rod and the vertical movement rod is released and released. The cutter with a sewing machine according to claim 1, wherein the cutter is connected to the sewing machine.   The support plate for supporting the cutter mechanism has an inverted L shape extending from the upper part of the frame head of the sewing machine to the work side, and the upper end of the upper part of the presser bar support frame is bent by 90 degrees. The cutter with a sewing machine according to claim 1 or 2, wherein the lower end is bent 90 degrees and screwed to the needle bar bracket portion at the lower end of the presser bar support frame.

Images