JP2005087732A - Buttonhole sewing machine having workpiece stopper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an improved buttonhole sewing machine having a workpiece stopper so as to increase flexibility according to the change of the shape and position of the buttonhole of the workpiece to be made. <P>SOLUTION: A buttonhole sewing machine (1) has a workpiece (44) stopper (54), a supporting board (17) for the workpiece (44) having a hole (18) for moving up and down a sewing needle (11), and a clamp for pressing the workpiece (44) to the supporting board (17). The stopper (54) is connected to the supporting board (17) separably and has positioning edges (68, 69, 70) for the workpiece (44). The stopper (54) is made of materials which can be cut by hand (plastics, boards). The positioning edges (68, 69, 70) are made by cut. The stopper (54) can be connected at the predetermined position of the supporting board (17) by a certain engaging part without tools. The position of the stopper (54) is secured on a sewing level by the engagement of the certain engaging part. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a buttonhole sewing machine having a workpiece stopper according to the superordinate concept (so-called part) of claim 1.

  According to Non-Patent Document 1, this type of buttonhole sewing machine is commercially available in the form of a durcup, class 556, and type sewing machine so that a color template having a plate-made stopper can be used. In this case, the stopper is screwed to a plate which is part of a support structure consisting of several parts. This structure is firmly connected to the buttonhole sewing machine. Due to the large number of parts, the cost of buttonhole sewing machines increases considerably.

  Another disadvantage is that the stopper must be screwed to the support plate, which requires high precision and considerable care to accurately reproduce the relative position. Installing or re-adjusting the stopper to adapt to other shapes of workpieces takes time, which has a negative impact on the availability of buttonhole sewing machines. In conclusion, the known buttonhole sewing machines do not meet the requirements for flexibility requiring quick and easy modification of the buttonhole sewing machine to the changed sewing conditions.

  Patent Document 1 teaches an adjustable angled stopper for a buttonhole sewing machine, the angled stopper comprising a bar attached to a workpiece support plate, a scale and an adjustable position stopper bar thereon Have In this design, a stopper is provided to place the work piece in contact with the button hole. Angled stoppers ensure that buttonholes are created in the workpiece at regular intervals, as standard from the outer edge of each workpiece, but there is no need to readjust the stopper for workpieces with different outer dimensions. There is a drawback to being essential. Such readjustment or new setting of the stopper is time consuming and risks misadjustment. Accordingly, angled stoppers no longer meet today's requirements for buttonhole sewing machines, i.e., for making buttonholes whose workpiece profile and position change frequently.

  Patent Document 2 teaches a buttonhole sewing machine or an apparatus used for a button sewing machine in order to facilitate positioning of a workpiece on the sewing machine. The disadvantages of the angled stopper described above also apply to this device.

German patent invention No. 286280 British Patent Application No. 787752 Print publication “Dulkop 556 parts list and sewing device”, imprint Wd500, edition 2/88, product no.1467867

  It is an object of the present invention to improve the known workpiece stopper buttonhole sewing machine in order to increase the improved flexibility with respect to changes in the shape of the workpiece to be made and the position of the buttonhole.

  According to the invention, this object is achieved by the features of claim 1. A particular advantage of the present invention is that the customer can immediately adapt the buttonhole sewing machine to the sewing work. The costs for adjusting the machine stop and buttonhole sewing machine caused by the fit to changing sewing conditions are greatly reduced. A further advantage is that the buttonhole sewing machine can only be adapted to changing sewing conditions by means of a stopper arranged on the workpiece support plate, and the stopper occupies an exact reproducible position on the workpiece support plate. Since adjustment errors are eliminated, a certain quality of production is achieved. The buttonhole sewing machine according to the present invention is a versatile source for making buttonholes in small lot size workpieces with frequently changing sewing conditions.

  Preferred further developments of the buttonhole sewing machine will become apparent from the features of claims 2-5. According to a further development according to claim 6, the advantage is obtained that the improvement of the buttonhole sewing machine for creating a buttonhole at the mirror image position is performed by the same stopper template used at the two use positions.

  According to a further development of the buttonhole sewing machine according to the dependent claim 7, the buttonholes of limited shape and size are automatically assigned to the stoppers provided for certain sewing operations according to the sewing conditions. This ensures that operating errors are eliminated and a higher degree of machine flexibility is obtained. Further development according to claim 8 results in a design with economic efficiency. The embodiment according to claim 9 provides an automatic assignment of a constant sewing program to a fixed stopper.

  Further advantages, features and details of the present invention will become apparent from the following description as exemplary embodiments in connection with the drawings.

  The buttonhole sewing machine 1 has a substrate 2 with an upright column 3 and an elbow arm 4 ending with a head 5. An arm shaft 6 is rotatably attached to the arm 4. A handle wheel 7 is connected to the end of the arm shaft 6 on the support column side. The handle wheel 7 is connected to a drive motor 9 located inside the arm 4 via a belt drive unit 8.

  Inside the head 5, the free end of the arm shaft 6 is connected to a crank drive (not shown) for operating the needle bar 10 in a manner known per se, and the needle bar 10 is directed toward the substrate. The sewing machine has a sewing needle 11 at the end. The needle bar 10 is supported on a zigzag stitch bearing 12 having a driving portion inside the head 5. The needle bar 10 is supported so that it can be jogged to the side and causes the zigzag movement of the sewing needle 11 at the level seen in FIG.

  A thread lever 13 is operatively connected to the crank drive and its free end 14 projects through a hole 15 in the head 5. According to FIG. 1, the buttonhole cutter 16 is located on the side of the needle bar 10 and protrudes from the end of the head 5 directed towards the substrate 2.

  A support plate 17 is attached to the substrate 2 and has a rectangular sewing hole 18 through which the sewing needle 11 passes. The shape of the hole 18 matches the zigzag stitch to be made. A hook 19 is located below the substrate 17 and cooperates with the sewing machine needle 11 to perform two-thread main sewing.

  A linear guide 20 is provided inside the support column 3, and a sliding bearing 21 is attached to the linear guide so as to be displaceable at a level seen in FIG. The plain bearing 21 has an appendage 22 that is firmly connected to the upper strand of the continuous timing belt as part of the timing belt drive 23. The drive unit 23 includes a fixed-side timing belt pulley 24 and a timing belt pulley 25 attached to a shaft of a drive motor 26 disposed in the substrate 2. A bearing portion 27 is formed on the slide bearing 21. Both arm levers 28 are rotatably attached to the support portion 27. A drive unit (not shown) pivotally attached to the arm of the lever 28 is formed on the slide bearing 21. The drive unit is embodied such that both arm levers 28 rotate about the fulcrum of the support unit 27. The free arm 29 of the lever 28 extends in the direction of the needle bar 10 (FIGS. 1 and 7) and ends with an elbow-like part forming a clamp 30. FIG. The clamp 30 has a rectangular recess 31 for accessing the sewing needle 11. Due to the specified action of both arm levers 28, the clamp 30 is pressed against the support plate 17 or lifted therefrom by a length of about 10 millimeters.

  A panel 32 is attached to the arm 4 and has a keyboard 33 and a digital display 34. The panel 32 is connected to an electronic control system 36 via a conductor 35, which has a microprocessor 37, an input / output circuit 38, a power supply unit and a program memory 40. The program memory 40 stores a plurality of sewing programs 41, 42, 43 which are applied to the work piece 44 with button holes of various parameters such as dimensions f and g and various numbers of stitches. Can be made to work.

  Via the power supply unit 39, it is connected to various drive units and positioning members in a manner known per se. As far as described, the buttonhole sewing machine 1 is known and commercialized by various manufacturers.

A sensor 45 is attached to the arm 29 and is connected to the control system 36 via a conductor 46. Two pins 47 and 48 are fixed to the support plate 17, and at that time, the connecting wire 49 passes through the pins 47 and 48 (FIG. 3). The connecting line 49 is located at an interval h in the direction from the sewing hole 18 toward the column 3. The connecting line 49 extends at right angles to the line 50 extending through the center of the sewing hole 18. The pins 47 and 48 are arranged at the same distance b from the line 50. The line 50 coincides with the vertical axis 51 of the button hole 52 to be manufactured (FIG. 8).

  FIG. 4 shows a semi-finished product designed as a blank 53 made of a material that can be cut by hand, for example a plate with a thickness d of about 3 mm, this semi-finished product being made of a stopper template 54 (FIG. 3). Is intended for. The cutting edge of the stopper template 54 constitutes a stopper having a positioning edge of the workpiece 44, which may still be described. Hereinafter, the term template 54 represents the stopper template 54.

  The blank 53 is substantially rectangular, and auxiliary lines intersecting at right angles are schematically drawn. These auxiliary lines are not actually present in the blank 53 and are meaningful only in the following description. The blank 53 has two cylindrical recesses 57 and 58 positioned on the auxiliary line 55 at a distance b from the auxiliary line 56. Furthermore, the blank 53 has a passage 59 in the form of a window that is symmetric about the auxiliary line 56 and defined by the vertices r, s, t, u. The width of the passage 59, i.e. the length in the direction of the auxiliary line 55, is dimensioned so that the clamp 30 fits in with about 1 millimeter of play. Furthermore, the passage 59 has a V-shaped notch 60 whose legs make an apex angle 61. Finally, a rectangular field 62 demarcated by a solid line is located near the recess 57. The rectangular field 62 is on the side 63 of the blank 53 as seen in FIG. 4, whereas the back side of the blank 63 labeled 64 has a field 65 corresponding to the field 62 near the field 58. It is shown in

  The following is a description of the process of processing the blank 53 to convert to the template 54.

  A template 54 is prepared for a precisely defined workpiece, but the sample must be available with a button hole made there. The following description is in the form of a shirt collar as shown in FIG. 9, with a left buttonhole 52a, and the desired parameters (sizing, number of seams, etc.) and the correct position. Item 44 is used.

  First, a round tool approximately 1 mm thick, for example a sewing needle, is placed at the starting point 66 of the buttonhole cut 67, and then the work piece 44 together with the tool is the apex of the V-shaped cut 60. It is placed on the blank 53 so that it is in the immediate vicinity of 61. Then, the rotational position of the workpiece 44 around the tool is adjusted to a desired position. Then, the outer contour of the workpiece 44 is copied onto the blank 53 with a stylus (pencil or ballpoint pen). Then, the blank 53 is now provided with a positioning edge 68 by manually cutting the area covered by the workpiece 44 using, for example, a scissors. In the cutting operation, the portion of the blank 53 defined by the points v, x and w, y is removed as waste. The blank 53 is now provided with a workpiece 44 positioning edge 68, including partial positioning edges 69, 70. As a result, the blank 53 cut to a predetermined size constitutes a template 54 that harmonizes with the workpiece 44 when the positioning edge 68 coincides with the outer contour of the workpiece 44.

  Thereafter, a marking 71 is provided on the template 54. For this purpose, an aluminum film strip 72 is glued to the field 62. The strip 72 has an edge 73. The edge 73 is spaced a distance a from the auxiliary line 55, and the distance a represents the marking 71 of this template 54. Correspondingly, different templates must have varying lengths of the distance a.

  Since the pins 47, 48 and recesses 57, 58 engaged by a positive fit 74 are symmetrical about the line 50, the template 54 is around the line 50 in the first use position G1 seen in FIG. The template 54 can be disposed on the support plate 17 at the second use position G2 rotated by 180 °. As a result, the same template 54 can be used to create the button holes 52b in the workpiece 44.

  As described above, the marking 71 is assigned to the use position G1. Similarly, at the position of the use position G2, the strip 72a is bonded onto the field 65 corresponding to the strip 72 and the marking 71 is similarly embodied. It can be envisaged that it is better to assign different markings to the positions G1, G2 when different button holes have to be made by using the template 54 at the first or second use position G1, G2.

The operation mode of the buttonhole sewing machine 1 is as follows.
Assume that once the current is switched on and the compressed air is made available for the existing pneumatic positioning member, the buttonhole sewing machine 1 is in a ready state of operation. In its stopped state,
The sewing needle 11 is located at a distance from the support plate 17 and above the support plate;
The clamp 30 is in a high position on the opposite side of the bearing plate 17,
-Neither the template 54 nor the work piece 44 is arranged on the support plate 17,
The clamp 30 has been moved to the basic position in the final position close to the column 3;

  First, the worker arranges the template 54 at the use position G1 on the support plate 17 so that the side surface 63 can be seen by the worker. After the position / orientation is adjusted (aligned) by arranging the recesses 57 and 58 on the pins 47 and 48, the template 54 is positioned at a limited position with respect to the sewing needle 11 by the engagement of the reliable fitting portion 74. Occupy. Then, the work piece 44 is inserted so that the button hole 52a is sewn, and the work piece 44 is arranged to lean against the partial positioning edges 69, 70, so that the work piece is positioned accurately / The direction is adjusted (it can be aligned).

  After the operator's command, the control system 36 first lowers the clamp 30 onto the work piece 44, and then the clamp 30 presses the work piece 44 against the support plate 17 and at the same time moves the clamp 30 away from the column 3. Move in the direction. During this operation performed by the drive motor 26 triggered when the sewing needle 11 is stopped, pulses emitted by the momentum transmitter 76 connected to the drive motor 26 are sent to the control system 36 via the lead 75. In addition, as soon as the sensor 45 senses the edge 73 of the marking 71, a pulse is sent over the lead 46 to the control system 36.

  The stored information on the pulses emitted by the momentum transmitter 76 and summed, the pulses emitted by the sensor 45 when the edge 73 is detected, and the distance h between the sewing needle 11 and the connecting line 49 are made available. Then, the microprocessor starts calculating the interval a.

  When the clamp 30 is actuated by the drive motor 26 in the form of a stepper motor without feedback on the rotational position by the momentum transmitter, the pulses delivered to the stepper motor by the control system 36 are used as a basis for determining the interval a. Is done.

  The determined interval “a” is sent to an evaluation circuit 77 provided in the microprocessor 37. At this time, the evaluation circuit 77 operates a sewing program assigned to the marking 71 from among the stored sewing programs 41, 42, and 43.

  When the signal is emitted by the sensor 45, the control system 36 returns the clamp 30 to its basic position. Thereafter, a button hole 52 a is made in the workpiece 44.

  In the specified operation sequence, the assignment of the sewing program to the use template 54 is automatically performed without the cooperation of the sewing machine operator.

  The operation of assigning a certain sewing needle program to a certain template is preferably performed by reading a barcode 79 relating to the marking 71 via a scanner 78 connected to the control system 36.

It is a front view of a buttonhole sewing machine. FIG. 2 is a side view of the buttonhole sewing machine viewed from the direction of arrow II in FIG. 1. FIG. 3 is an enlarged plan view of a seam forming region of the sewing machine viewed along line III-III in FIG. 2. FIG. 4 is a diagram of a template seen in FIG. It is a side view of the template seen from the direction of the arrow V of FIG. It is the expanded sectional view cut | disconnected along VI-VI of FIG. It is a diagram of a buttonhole sewing machine equipped with an electronic control system. It is an enlarged plan view of the workpiece in which the button hole is sewn. It is a figure of the shirt color in which the button hole was made. It is an enlarged view of the part of the stopper template which has a barcode.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sewing machine 2 Board | substrate 3 Support | pillar 4 Arm 5 Head 6 Arm axis | shaft 7 Handle wheel 8 Belt drive part 9 Drive motor 10 Needle bar 11 Sewing needle 12 Zigzag sewing bearing 13 Thread lever 14 End part 15 Hole 16 Cutter 17 Bearing plate 18 Sewing hole 19 Hook 20 Linear Guide 21 Slide Bearing 22 Addition 23 Timing Belt Drive 24 Timing Belt Pulley 25 Timing Belt Pulley 26 Drive Motor 27 Bearing 28 Double Arm Lever 29 Free Arm 30 Clamp 31 Recess 32 Panel 33 Keyboard 34 Display 35 Conductor 36 Control system 37 Microprocessor 38 Input / output circuit 39 Power feeding unit 40 Program memory 41 Sewing machine program 42 Sewing machine program 43 Sewing machine program 44 Workpiece 45 Sensor 46 Conductor 47 Pin 48 Pin 49 Connecting wire 50 Wire 52 Button hole (a, b)
53 Blank 54 Stopper template (template)
55 Auxiliary line 56 Auxiliary line 57 Recess 58 Recess 59 Passage 60 V-shaped cut 61 Apex 62 Field 63 Side face 64 Side face 65 Field 66 Start point 67 Button hole cut 68 Positioning edge 69 Partial positioning edge 70 Partial positioning edge 71 Marking 72 Band shape Piece 73 Edge 74 Engagement of positive fitting portion 75 Conductor 76 Momentum transmitter 77 Evaluation circuit 78 Scanner 79 Bar code G1 First use position G2 Second use position a Interval b Interval d Thickness f Dimension g Dimension h Interval r vertex s vertex t vertex u vertex v point w point x point y point

Claims (9)

A buttonhole sewing machine having a workpiece (44) stopper (54),
a) Workpiece (44) with support plate (17),
b) The support plate (17) has holes (18) for raising and lowering the sewing needle (11),
c) The stopper (54) is made of a material that can be cut by hand and is removably attached to the sewing machine (1);
d) In the buttonhole sewing machine having a positioning edge (68) for aligning the work piece (44) placed on the support plate (17) within a range of operation of the sewing needle (11),
e) The stopper (54) can be connected to the support plate (17) without using a tool,
f) The stopper (54) occupies a position that can be accurately reproduced on the work piece (44) and the support plate (17), and is positioned on the support plate (17) by the engagement of the positive fitting portion (74). A buttonhole sewing machine, characterized in that the engagement of the positively fitting part consists of a protrusion (47; 48) inserted into the recess (57; 58).   The engagement of the positive fitting part (74) consists of at least two cylindrical recesses (57, 58) and two pins (47, 48) which can occupy positions therein. The buttonhole sewing machine according to claim 1.   The pins (47, 48) are arranged on a connecting line (49) extending perpendicularly to the longitudinal axis (51) of the button hole (52) and extending from the longitudinal axis (51) at the same interval (b). The buttonhole sewing machine according to claim 2.   3. The buttonhole sewing machine according to claim 1, wherein the pin (47, 48) is formed on the support plate (17) and the recess (57, 58) is formed on the stopper (54).   5. A buttonhole sewing machine according to claim 4, characterized in that the stopper (54) is made of a blank (53) consisting of a cylindrical recess (57, 58).   The stopper (54) can be connected to the support plate (17) of the buttonhole sewing machine (1) at the first use position (G1) and the second use position (G2). These use positions (G1, G2) Corresponds to the position of the stopper (54) rotating around the longitudinal axis (51) of the button hole (52) to be manufactured. Hole sewing machine.   The stopper (54) has a marking (71) detectable by a sensor (45; 78) connected to the electronic control system (36) of the buttonhole sewing machine (1), the control system (36) It has a circuit (77) for releasing the start of the machine (1) when the sewing program belonging to the stopper (54) is assigned from among the sewing programs (41, 42, 43). Item 7. The buttonhole sewing machine according to any one of Items 1 to 6.   8. A buttonhole sewing machine according to claim 7, characterized in that the marking (71) comprises a bar code (79).   The marking (71) has an edge (73) that is detectable by the sensor (45), and its spacing (a) from the reference line (55) represents a parameter that identifies the stopper (54). The buttonhole sewing machine according to claim 7.

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