JPH0637826Y2 - Sewing machine pattern designator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewing machine pattern designating device, and more particularly to a sewing machine for forming a desired pattern on a work cloth in accordance with a pattern cam selected by an operator. By operating the body, a pattern code signal indicating a pattern corresponding to the rotational position of the selection cam body having a cam surface for selecting the pattern cam is generated, and the pattern code signal is electrically processed to generate the pattern code signal. The present invention relates to an improvement of a pattern indicating device capable of displaying information on a selected pattern on a display and controlling rotation of a motor for driving a pattern cam.

Conventional technology By rotating a selection operation body represented by a dial, a desired cam is selected from a plurality of built-in pattern cams, and a pattern is mechanically formed on a work cloth according to the selected pattern cams. Pattern stitch sewing machines are widely used. This pattern stitch sewing machine is, for example, shown in FIGS.
As shown in the drawing, a pattern cam 12 for needle swing and a pattern cam 14 for cloth feed are rotatably disposed above the sewing machine frame 10, and on the front side of the pedestal 16 in the sewing machine frame 10, A selection operation body 18 including a pattern selection dial and a swing width adjusting dial 20 are arranged in parallel.

A rotary shaft 22 is rotatably and pivotally supported in the sewing machine frame 10, and the selection operation body 18 is inserted and fixed to the tip of the rotary shaft 22,
A selection cam body 24 is inserted and fixed at an intermediate position of the rotary shaft 22. The selection cam body 24 is configured as a cylindrical member having a double cylindrical wall, and a cam surface for selecting the pattern feeding cam 14 at the open end of the cylindrical wall located outside thereof.
24a is formed at a predetermined rotation position, and a cam surface 24b for selecting the pattern cam 12 for needle swinging is formed at a predetermined rotation position at the open end of the cylindrical wall located inside. The cloth feeding pattern cam 14 and the cam surface 24a and the needle swinging pattern cam 12 and the cam surface 24b are connected to each other by a link lever mechanism 26 shown in the drawing, and the selection operation body 18 is rotated. As a result, the rotational position of the selected cam body 24 is changed to the rotational position corresponding to the desired pattern, and the selected pattern cams 12, 1 are selected.
According to 4, desired patterns can be formed on the work cloth.

In this type of pattern stitch sewing machine, various types of displays typified by a display are provided for the purpose of visually or / and audibly displaying information regarding a pattern or the like selected by the rotation operation of the selection operation body 18 to the operator. Means are provided. For example, in the pattern stitch sewing machine shown in FIG. 3, information about various patterns of stitch patterns, swing widths, types of presser foot, and the like is displayed on the front side of the operator side of the upper arm 28, and the selected information is displayed. A display 30 including a light emitting diode group that is designated by is provided. Then, when the operator rotates the selection operation body 18 and selects a desired pattern, among the various information displayed on the display 30, the light emitting diode provided corresponding to the display portion of the information related to the selection is turned on. Then, the operator is informed that the selection is completed. In this case, an electronic sound may be generated in synchronism with the lighting of the light emitting diode to perform auditory confirmation together, and as the type of the display 30, other liquid crystal display plates may be used.

Problems to be Solved by the Invention In a sewing machine that includes the above-described selection operation body 18 and mechanically selects a desired pattern, information regarding the selected pattern is displayed on a display including a light emitting diode or other liquid crystal display panel. In order to display, a so-called pattern designating operation of electrically detecting the movement of the selection operation body 18 and inputting the obtained electric signal to the control circuit of the display means is required. Therefore, conventionally, in order to electrically display the selection status of the pattern, for example, as disclosed in Japanese Utility Model Application Laid-Open No. 59-133174, a pattern select switch group that interlocks with the pattern selection dial is provided, and each sewing pattern A structure is adopted in which the corresponding switch is operated in conjunction with the selection to display the selected pattern on the desired pattern panel. However, this pattern select switch group is substantially a rotary switch mechanism, and is provided with fixed contacts and movable contacts that slide with respect to the fixed contacts. There is a drawback that the electrical and electrical reliability is reduced. Further, since the number of contact points of the rotary switch is mechanically limited, it is pointed out that, at present, when there is a demand for displaying a large number of pattern information, it becomes impossible to display due to the insufficient number of contact points.

As a means for rotating the pattern cam, in addition to the mechanical linking mechanism between the selection cam body 24 and the link lever mechanism 26 described above, an electric mechanism for rotating the pattern cam by a dedicated motor is also partially adopted. Has been done. For example, actual development Sho 56-164775
In the electric sewing machine disclosed in the publication, the selection cam body is rotated with respect to a desired pattern, and this rotation is turned on / off.
A signal is generated by detecting the off operation, and when the integrated number of this signal matches a preset number, the operation of the motor for selecting the pattern cam is stopped and the desired pattern is selected. There is. However, in this sewing machine, it is necessary to perform the work of setting the selection cam body at a predetermined origin every time the power of the sewing machine is turned on, which has a drawback that the circuit becomes complicated.

The purpose of the invention This invention was proposed to solve the drawbacks inherent in the above-described sewing machine pattern indicating device according to the prior art, and has excellent durability and reliability for long-term use,
Moreover, it is an object of the present invention to provide a pattern indicating device which has a simple structure and can be manufactured at low cost.

Means for Solving Problems As a result of various studies to solve the above problems, the inventor has found that a pattern stitch sewing machine having a mechanical structure has
The fact that a selection cam body for selecting the pattern cam is necessarily provided and there is a part that is not functionally used other than the cam surface for selecting the pattern cam and the present microswitch is We came to pay attention to the fact that the performance has improved dramatically. A concave-convex cam is integrally formed on a portion of the selection cam body that has not been functionally used in the past, and a plurality of microswitches that are turned on and off by contacting and separating from the concave-convex cam by the rotation of the selection cam body. If they are arranged in a relational manner and a desired pattern code signal is generated by combining a plurality of these micro switches, they are excellent in durability and reliability for long-term use and can be manufactured at a low cost with a simple structure. It was found that a pattern pointing device could be obtained.

That is, in order to overcome the above-mentioned problems and achieve the intended purpose, the sewing machine of the present invention is rotatably supported by the machine frame of the sewing machine, and the cam surface for selecting each of the plurality of pattern cams has each pattern. A selection cam body correspondingly formed at a predetermined rotation position, a selection operation body operable to change the rotation position of the selection cam body to a rotation position corresponding to a desired pattern, and the selection operation body And a code signal generating means for generating a code signal instructing a pattern corresponding to the rotation position of the selection cam body, and pattern formation is performed according to the desired pattern cam selected by the selection operation body. A plurality of rows of concavo-convex cam portions integrally formed on the surface of the selection cam body other than the cam surface forming portion along the rotation direction of the selection cam body, and a concavo-convex pattern of the plurality of rows. Opposed to the movement path of the cam Is fixed to the sewing machine frame so as to be positioned at the position, and is constituted by a plurality of microswitches for operating the code signal generating means by performing an on / off operation by cam-engaging the concave-convex cam portion. .

Embodiments Next, a pattern designing device for a sewing machine according to the present invention will be described below with reference to the accompanying drawings with reference to preferred embodiments. The same members as those described in the related art are designated by the same reference numerals.

As shown in FIGS. 1 and 2, the selection cam body 24 having cam surfaces 24a, 24b for selecting the pattern cams 12, 14 respectively on one side surface has a plurality of rows on the other side surface. The concavo-convex cam portion 32 is integrally formed in the rotation direction of the selection cam body 24. In the example shown in FIG. 1, the concave-convex cam portions 32 are formed in five rows in an arc shape with different radii on one side surface of the selection cam body 24. For convenience of explanation, when the outermost concave / convex cam portion is designated as the first arcuate concave / convex cam portion by the reference numeral 32a, the second circular arcuate concave / convex cam portion 32b, the third circular arcuate concave / convex cam portion 32c and the fourth circle will be described below. The arcuate concave-convex cam portions 32d are sequentially arranged toward the fifth arcuate concave-convex cam portion 32e located on the innermost side in the radial direction. Further, in the drawing, the first arcuate concave-convex cam portion 32a is indicated by "diagonal thin line", hereinafter the second concave-convex cam portion 32b is "diagonal thick line", the third concave-convex cam portion 32c is "diagonal broken line", the fourth. The concave / convex cam portion 32d is indicated by "diagonal thin line and thick line", and the fifth concave / convex cam portion 32e is indicated by "mesh".

The arrangement state of these five rows of concave-convex cam portions 32a to 32e is shown in a front view in FIG. 4 (a) and in a developed state in FIG. 4 (b). If, for example, 21 types of pattern information are individually displayed on the display 30, each interval from A to U corresponds to each of the 21 types of pattern information, and the central angle of each interval is , 360 ° ÷ 21 = 17.143 °.
Further, each concave-convex cam portion 32 is intermittently formed with a required length in the circumferential direction, and the arrangement form thereof is determined by an appropriate cam design in consideration of the number of pattern information to be selected.

As shown in FIG. 2, a support substrate 34 is fixedly provided inside the sewing machine frame 10 and at a fixed position close to the side of the select cam body 24 where the plurality of concave and convex cam portions 32 are formed. This support substrate 34, five micro switch SWa ₁ ~SWa ₅ is disposed at a predetermined position, the micro switch SWa ₁ ~SWa ₅
The switch pressing pieces Pa _{1 to} Pa ₅ respectively projecting from the corresponding ones are oriented correspondingly to the five rows of concave and convex cam portions 32a to 32e. That is, the pushing piece Pa ₁ of the micro switch SWa ₁ corresponds to the uneven cam portion 32a located on the outermost side, and hereinafter, the pushing piece Pa ₂ is the uneven cam portion 32b, and the pushing piece Pa ₃ is the uneven cam portion 32c. The pushing piece Pa ₄ corresponds to the uneven cam portion 32d, and the pushing piece Pa ₅ corresponds to the uneven cam portion 32e. When the concave-convex cam portions 32a (to 32e) are engaged with and disengaged from the corresponding pushing pieces Pa ₁ (to Pa ₅ ) by the rotation of the selection cam body 24, the micro switches SWa ₁ (to SWa ₅ ) are turned on. The operation and the off operation are performed.

The micro switches SWa _{1 to} SWa ₅ are electrically connected to a code signal generating means 36 for generating a code signal instructing a pattern corresponding to the turning position of the selection cam body 24 in accordance with ON operation and OFF operation of the micro switches. It is connected. The code signal generating means 36 is, for example, as shown in FIG.
The micro switch SWa _{1 to} SWa ₅ and an encoder 38 are provided, and the encoder 38 stores a variety of pattern guide information (for example, display data for zigzag stitches and display data for decorative patterns) in a memory 40. The memory 40 is connected to the display 30 composed of a liquid crystal display panel via a driver 42.

Operation of the Embodiment Next, the operation of the sewing machine pattern designating device according to the embodiment of the present invention constructed as described above will be described. When a desired pattern is formed, the operator rotates the selection operation body 18 to select the desired pattern, whereby the selection cam body 24 interlocked with the selection operation body 18 rotates at a time corresponding to the desired pattern. The cloth feeding pattern cam 14 and the needle swinging pattern cam 12 corresponding to the cam surfaces 24a, 24b which have changed to the moving position are selected.

By this rotation of the selection cam body 24, the concave-convex cam portions 32a to 32e formed on one side surface of the selection cam body 24 become the push pieces Pa _{1 to} Pa ₅ provided on the respective microswitches SWa _{1 to} SWa ₅ . Correspondingly engage and disengage, which causes each microswitch SWa ₁
~ Turn SWa ₅ on and off. The electrical interrupt signal generated by the on / off operation of the plurality of micro switches SWa _{1 to} SWa ₅ is converted into a coded address signal in the encoder 38 of the code signal generating means 36. This address signal is input to the memory 40 which stores pattern guide information relating to zigzag stitches whose shapes are displayed on a pattern display plate (not shown) and various decorative patterns, and specifies a required memory area here.

The pattern guide information specified in the memory 40 is the pattern cams 12, 1 selected by the selection cam body 24 by the rotation of the selection operation body 18.
It corresponds to 4 and this pattern guide information operates the display 30 composed of a liquid crystal display board via the driver 42,
Information such as the selected pattern name, needle swing amount, cloth feed amount and kind of cloth presser is displayed.

It should be noted that while the selection cam body 24 is being rotated to select the pattern desired by the operator, the micro switches SWa ₁ to
SWa ₅ continues the on / off operation and outputs the encoded address signal from the encoder 38 to the memory 40 at random. In order to prevent the operation of the display 30 from being disturbed by this random signal, it is preferable to provide the code signal generating means 36 with a latch 44. At this time, a sixth micro switch is provided at an appropriate position in order to confirm that the selection of the pattern cams 12 and 14 by the selection cam body 24 is completed, and the sixth micro switch responds to the signal from the sixth micro switch. The latch 44 stores the input signal and inputs the intermittent signal according to the on / off state from the microswitches SWa _{1 to} SWa ₅ to the encoder 38.

Next, FIG. 6 is a perspective view showing a selection cam body 25 according to another embodiment, in which the outer peripheral surface of the selection cam body 25 has a plurality of rows of concave and convex cam portions 33a to 33e in the rotational axis direction. Are juxtaposed. In addition, at a fixed position near the outer peripheral surface of the selection cam body 25,
Support substrate with ₅ microswitches SWb _{1 to} SWb ₅
35 are fixed. And each micro switch SWb ₁
Switch push piece Pb ₁ (to Pb ₅ ) protruding from (to SWb ₅ )
Are opposed to the five rows of uneven cam portions 33a to 33e, respectively. Therefore, by rotating the selection cam body 25, each uneven cam portion 33
a (~33e) is engaged and disengaged in the corresponding pressing piece Pb ₁ (~Pb _5), the micro switch SWb ₁ (~SWb ₅₎ performs ON operation and OFF operation.

In the illustrated example, the code signal generated by the code signal generating means 36 is used as a drive signal for displaying desired pattern guide information on the display 30. However, in addition to this, in a sewing machine provided with a dedicated motor for rotating the pattern cam, such as the electric sewing machine disclosed in Japanese Utility Model Laid-Open No. 56-164775, which corresponds to the rotating position of the selection cam body. The code signal instructing the pattern may be used as a control signal for the motor for rotating the pattern cam. in this case,
As described in the related art, it is not necessary to set the origin each time the power of the sewing machine is turned on, and the circuit configuration is simplified.

Effect of the Invention As described above, in the pattern designing device for the sewing machine according to the present invention, the pattern sewing machine generally has the selection cam body for selecting the pattern cam, and the selection cam body is for selecting the pattern cam. Paying attention to the fact that there are functionally unused parts other than the cam surface, a concave-convex cam is integrally formed on the part of the selection cam body that has not been used conventionally, and the rotation of this selection cam body A plurality of micro-switches that are turned on and off by contacting and separating from the concave-convex cam are provided in a relational manner, and a desired pattern code signal is generated by a combination of the plurality of switches.
Since the micro switch used in this pattern pointing device has no mechanically sliding contacts, it has excellent durability and reliability for long-term use, and because it has a simple structure, it has the effect that it can be manufactured at low cost. is there. If the coded signal is generated in binary, when the number of microswitches is 4, 16 corresponding to pattern information from 0000 to 1111 is generated.
When the type and the number of micro switches are 5, 00000 to 1
32 types of information up to 1111 can be identified. Therefore, the present invention can be preferably used for a pattern sewing machine that needs to display a large amount of pattern information as it is now.

[Brief description of drawings]

FIG. 1 is a perspective view of a selection cam body which is preferably used in a sewing machine pattern designating device according to an embodiment of the present invention. A concave and convex cam portion is formed on one side surface of the selection cam body. 2 shows a state in which it can be engaged with the micro switch of FIG. 2, and FIG. 2 is a vertical sectional view of a sewing machine according to an embodiment of the present invention,
FIG. 3 is a front view of a sewing machine to which the pattern designating device according to the embodiment is applied, and FIG. 4 (a) is a front view showing an arrangement state of five rows of concave and convex cam portions formed on one side surface of a selection cam body. 4 (b) is a development view of the uneven cam portion shown in FIG. 4 (a), FIG.
FIG. 6 is a circuit diagram of a code signal generator used in a sewing machine pattern designating device according to an embodiment of the present invention, and FIG. 6 is a perspective view of a selection cam body according to another embodiment. 10 …… Sewing machine frame 12,14 …… Pattern cam, 18 …… Selecting operation body 24,25 …… Selecting cam body 24a, 24b …… Cam surface 32a to 32e, 33a to 33e …… Concave cam section 36 …… Code signal generating means SWa _{1 to} SWa ₅ , SWb _{1 to} SWb ₅ ... Micro switch

Claims (3)

[Scope of utility model registration request] 1. A sewing machine frame (10) is rotatably supported,
A selection cam body (24, 25) having cam surfaces (24a, 24b, 25a, 25b) for selecting each of the plurality of pattern cams (12, 14) formed at a predetermined rotation position corresponding to each pattern. And a selection operation body (18) operable to change the rotation position of the selection cam body (24, 25) to a rotation position corresponding to a desired pattern, and an operation of the selection operation body (18). , The selection cam body (2
4, 25) and a code signal generating means (36) for generating a code signal for designating a pattern corresponding to the rotational position of the desired pattern cam (12, 1) selected by the selection operation body (18).
In a sewing machine in which a pattern is formed according to 4), the cam surface (24a, 24a) of the selection cam body (24, 25) is
b, 25a, 25b) on the surface other than the formation part of the selection cam body (24, 2
5) A plurality of rows of concavo-convex cam portions (32a to 32e, 33a to 33e) that are integrally formed along the rotation direction of 5), and the movement loci of these concavo-convex cam portions (32a to 32e, 33a to 33e). Is fixed to the sewing machine frame (10) so as to be opposed to the machine machine, and is engaged with the concave and convex cam portions (32a to 32e, 33a to 33e) to perform an on / off operation, thereby performing the code signal. patterns indicating device of a sewing machine, characterized by being configured from a plurality of micro-switches for operating generating means _{(36) (SWa 1 ~SWa 5} , SWb 1 ~SWb 5). 2. The plurality of rows of concave and convex cam portions (32a to 32e),
The sewing machine pattern designating apparatus according to claim 1, wherein the selection cam bodies (24) are formed on one side surface with different radii, respectively. 3. The plurality of rows of concave and convex cam portions (33a to 33e),
2. The sewing machine pattern designating device according to claim 1, wherein the selection cam body (25) is arranged on the outer peripheral surface of the selection cam body in the direction of the rotation axis thereof.