Patent Grant
7983782
This application is based upon and claims the benefit of priority from the prior Japanese Patent Application No. 2006-101561 filed on Apr. 3, 2006, the entire contents of which are incorporated herein by reference.
1. Technical Field
The present disclosure relates to a sewing machine provided with a spool pin stand on which a display device is mounted for displaying a color of needle thread used for sewing.
2. Description of the Related Art
Multineedle sewing machines have conventionally been put to practical use in order that colorful embroidery patterns may be sewn using embroidery threads of a plurality of colors. One of the multineedle sewing machines comprises a spool pin stand having a plurality of spool pins to which thread spools are attachable respectively and a needle bar mechanism including a plurality of, for example, six, nine or twelve needle bars which are aligned and have lower ends to which sewing needles are attached respectively. The multineedle sewing machine also comprises a needle bar switching mechanism which selects the needle bar being driven vertically from a plurality of the needle bars, a plurality of thread tension regulators applying tension to respective needle threads and a plurality of thread take-ups. When embroidery sewing is to be carried out using the multineedle sewing machine, an operator attaches needle thread spools of a plurality of thread colors necessary for embroidery sewing to the spool pins respectively and thereafter, passes a needle thread drawn from the thread spool through the corresponding thread tension regulator and thread take-ups. The needle thread is finally passed through an eye of the sewing needle.
On the other hand, a thread passage along which a needle thread drawn from each thread spool is supplied to a sewing needle is generally determined as a threading passage for every spool pin. Each needle thread is passed along the thread passage through a thread tension regulator so that the needle thread is prevented from coming into contact with and being entangled with another needle thread. However, the spool pins and thread tension regulators come closer to one another as the number of sewing needles becomes larger. As a result, there is a problem that the threading passage is easily mis-selected. In view of this problem, various proposals have been made in order that the needle thread may be prevented from being erroneously passed.
For example, JP-A-2001-54692 discloses a thread guide device for a multineedle embroidery sewing machine, in which twelve light-emitting diodes are provided on a thread guide passage (thread passing passage) near a plurality of thread guide tension discs and a plurality of thread tension members (corresponding to thread tension regulators) both corresponding to twelve needle bars respectively. When the operator operates a selection key on an operation panel to select a needle bar number, the light-emitting diode on the thread guide passage corresponding to the selected needle bar is turned on, so that the operator can be prevented from error in thread passing.
However, the light-emitting diodes are disposed on the thread guide passage near the thread guide tension discs and the thread tension members both corresponding to the needle bars respectively and one of the light-emitting diodes is merely turned on when the needle thread is passed. Accordingly, the operator cannot clearly determine to which spool pin the thread spool should be attached even though he or she can understand a passage along which the needle thread is passed. Consequently, there is a possibility that the operator may attach a thread spool to an erroneous spool pin. In this case, the needle thread cannot be drawn from the thread spool smoothly such that sewing cannot be carried out normally.
Therefore, an object of the present disclosure is to provide a sewing machine provided with a spool pin stand which can attach thread spools of a plurality of thread colors used for sewing without error.
The present disclosure provides a sewing machine comprising a plurality of needle bars provided for a sewing operation using a plurality of needle threads, a spool pin stand having a plurality of spool pins to which a plurality of thread spools corresponding to the needle bars are attachable and a plurality of seats which are provided so as to correspond to the spool pins, respectively, a plurality of thread passage defining members defining a thread passage extending from the spool pin stand to the needle bars, a sewing data storage unit which stores sewing data including at least thread color information about colors of the needle threads, a plurality of thread supply display units which are provided on the spool pin stand so as to correspond to the spool pins respectively, the thread supply display units being configured to produce light which transmits through at least ones of the spool pins and the seats and displaying the thread colors in a color-variable manner, respectively, and a thread color information display control unit which controls the thread supply display units based on the thread color information read from the sewing data storage unit, so that a plurality of thread colors corresponding to the spool pins are displayed by the thread supply display units, respectively.
According to the above-described construction, when the operator selects an embroidery pattern to be sewn, the thread color information display control unit reads thread color information about a needle thread color from sewing data of the embroidery pattern, controlling a plurality of the thread supply display units which are provided on the spool pin stand so as to correspond to a plurality of the spool pins respectively, so that a plurality of thread colors corresponding to the respective spool pins are displayed. Consequently, the operator can easily but exactly attach a thread spool having the same thread color as displayed on the display unit to the spool pin for which the thread color is displayed, without erroneously selecting another spool pin.
The disclosure also provides a spool pin stand for use with a sewing machine including a plurality of needle bars provided for a sewing operation using a plurality of needle threads. The spool pin stand comprises a plurality of spool pins to which a plurality of thread spools corresponding to the needle bars are attachable, respectively and a plurality of thread color display units which display thread colors in a color-variable manner so that the thread colors correspond to the spool pins, respectively, the thread supply display units being configured to produce light which transmits through at least ones of the spool pins and the seats.
According to the above-described construction, a plurality of the thread color display units are provided on the spool pin stand for displaying the thread colors in the color-variable manner so that the thread colors correspond to the spool pins. Consequently, the operator can easily but exactly attach a thread spool having the same thread color as displayed on the display unit to the spool pin for which the thread color is displayed, without erroneously selecting another spool pin.
Other objects, features and advantages of the present disclosure will become clear upon reviewing the following description of the illustrative examples with reference to the accompanying drawings, in which:
One illustrative example of the present disclosure will be described with reference to
The arm 3 includes a head 4 to which a needle bar case 5 provided with a cover made from a synthetic resin is mounted. The needle bar case 5 has a plurality of, for example, six needle bars 8 which are attached thereto so as to align in the right-left direction. The head 4 further includes six thread take-ups 10 which are aligned in the right-left direction so as to correspond to the needle bars 8 respectively. The needle bars 8 have lower ends to which sewing needles 9 are attached respectively. The needle bar case 5 includes an upper end to which a thread tension frame 11 is fixed so as to be inclined slightly upwardly rearward. The thread tension frame 11 is made from a synthetic resin and provided with six thread tension regulators 12 to 17 corresponding to needle threads to be supplied to the sewing needles 9 respectively. The arm 3 encloses therein a needle bar switching mechanism (not shown) having a needle bar switching motor 64 (see
Upon drive of the needle bar switching motor 64 in changing a needle thread, the needle bar case 5 is moved in the right-left direction together with the thread tension frame 11 by the needle bar switching mechanism so that one of the six needle bars 8 and one of the six thread take-ups 10 are simultaneously switched to respective active positions. Subsequently, the embroidery frame supported on the carriage 7 and a sewing machine motor 63 (see
A pair of first and second spool pin stands 20 and 21 are provided on a rear half of the top of the arm 3 into a generally V-shaped arrangement as viewed from above. The right, first spool pin stand 20 is provided with three spool pins 22b to 24b (see
The first and second spool pin stands 20 and 21 will now be described. Since the first and second spool pin stands 20 and 21 have the same construction, only the first spool pin stand 20 will be described. Referring to
The first to third spool lamps 32 to 34 produce full-color light when receiving drive signals from a control device 50 as will be described later. The colored light is transmitted to all of the seats 22a to 24a and thread spools 22b to 24b, whereupon it appears that the seats 22a to 24a and the spool pins 22b to 24b produce light. Accordingly, even when the thread spools 29 have been attached to the spool pins 22b to 24b, the operator can easily view the colored light through the upper ends of the spool pins 22b to 24b and the outer circumferences of the seats 22a to 24a. The other, second spool pin stand 21 has the same construction as described above. More specifically, fourth to sixth spool lamps 35 to 37 comprising full-color LEDs are embedded in lower ends of the spool pins 25b to 27b respectively. Accordingly, the operator can easily view colored light peculiar to each of the spool pins 25b to 27b.
The thread tension regulators 12 to 17 will now be described. Since the six thread tension regulators 12 to 17 have the same construction, only the thread tension regulator 12 will be described. As shown in
The adjusting knob 12c is made from a transparent or translucent synthetic resin. The thread tension shaft 12b is hollow and is formed with a through hole (not shown). The through hole has an upper open end in which a first thread tension lamp 42 comprising a full-color LED is provided. The first thread tension lamp 42 produces full-color light when receiving a drive signal from the control device 50 (see
The control system of the multineedle embroidery sewing machine M will be described with reference to
To the output port of the control device 50 are connected a drive circuit 69 for a sewing machine motor 63, a drive circuit 70 for the needle bar switching motor 64, a drive circuit 71 for a thread cutting motor 65 driving a thread cutting mechanism, a drive circuit 72 for the threading motor 66 driving a threading mechanism, drive circuits 73 and 74 for X-axis and Y-axis drive motors 67 and 68 provided in the carnage driving mechanism, the first to sixth spool lamps 32 to 37 and the first to sixth thread tension lamps 42 to 47. The operation panel 30 is connected to the input/output port of the control device 50 so that the operation panel 30 and the control device 50 are capable of transmitting and receiving signals therebetween.
The ROM 52 stores a drive control program for controlling the motors 63 to 68 for execution of embroidery sewing, a plurality of types of sewing data for embroidery sewing and a processing program for an embroidery sewing process peculiar to the present disclosure as will be described later. Each sewing data includes needle location data indicative of needle locations in the sewing and thread color data indicative of thread colors of needle threads for every sewing area (A1 to A7) on which stitches are continuously formed using the needle thread of the same thread color, as shown in
The flash memory 54 stores a needle bar thread color table of numbers of the six needle bars 8, that is, sewing needle numbers, corresponding thread colors of needle threads set on the sewing needles 9 of the respective needle bars 8, the corresponding first to sixth spool pin stand lamps 32 to 37 and the corresponding first to sixth thread tension regulator lamps 42 to 47, as shown in
The RAM 53 is provided with a sewing data memory storing sewing data read from the ROM 52 for sewing execution, sewing thread color memory storing thread color data for sewing execution as shown in
An embroidery sewing process executed by the control device 50 of the multineedle embroidery sewing machine M will now be described with reference to the flowcharts of
In the aforesaid collating process, no thread change is necessary when the read six thread colors (see
Subsequently, when the operator has operated the start/stop switch 55 for start (S16: Yes), the control device 50 sequentially drives the motors so that a sewing process (see
Referring to
However, when thread breakage has occurred in the currently used needle thread during the sewing process of the one stitch, the control device 50 receives a thread breakage signal from any one of the thread breakage sensors 57 to 62 corresponding to the needle thread, for example, the thread breakage sensor 57 (S32: Yes). In this case, the control device 50 carries out an interrupting process of stopping drive of the sewing machine motor 63 and the like (S34). Furthermore, the control device 50 changes any one of the thread tension lamps 42 to 47 corresponding to the needle thread with the thread breakage, for example, the thread tension lamp 42 from a lighted state to a flashing state (S35). In this case, when finding occurrence of thread breakage from the flashing display by the thread tension lamp 42, the operator prepares re-threading of the needle thread with the thread breakage occurred. When the operator then operates the threading switch (S36: Yes), the control device 50 carries out a threading process of passing the needle thread through the needle eye of the sewing needle 9 as described above (S37). The control device 50 then turns on the thread tension lamp 42 corresponding to the needle bar 8 of the sewing needle 9 with the needle eye through which the needle thread has been passed so that the thread tension lamp 42 is lighted (S38). Thereafter, the control device 50 carries out S31 to S33 thereby to execute the sewing process from the needle location at the time of occurrence of thread breakage.
Subsequently, in the embroidery sewing process, when the needle thread of the thread color used in the sewing process at S17 is not used in the subsequent sewing after execution of the sewing process for the initial one thread color (S18: No), the control device 50 turns off the spool lamp 32 of the aforesaid thread color and the thread tension lamp 42, resetting the lamp flags of the spool lamp 32 and the thread tension lamp 42 (flag data=0; and S19). When the embroidery sewing process has not been completed (S20: No), the control device 50 repeats S14 and subsequent steps with use of the threads of the second and subsequent thread colors, thereby executing the embroidery sewing process. More specifically, the control device 50 sequentially drives second to sixth needle bars 8 every time advancing to S17, thereby sequentially carrying out with use of the needle threads of, for example, red, blue, green, yellow and purple. When the embroidery sewing process has been completed (S20: Yes), the control device 50 repeats S11 and subsequent steps.
On the other hand, when the needle thread of the thread color used in the sewing process at S17 is used in the subsequent sewing after execution of the sewing process for the initial one thread color (S18: Yes), the control device 50 repeats S14 and subsequent steps without execution of S19.
Thread change is necessary when the six thread colors to be used in the current embroidery sewing do not correspond with the six thread colors used in the previous embroidery sewing. When thread change is necessary (S14: Yes), the control device 50 carries out a thread color setting process for thread change for every needle bar 8 (S21). In the thread color setting process, the control device 50 changes a first thread color of the needle bar thread color table based on data of a thread color stored on the sewing thread color memory. Subsequently, the control device 50 flashes one of the spool lamps 32 to 37 which necessitates thread change and one of the thread tension lamps 42 to 47 which necessitates thread change, based on the first thread color of the new needle bar thread color table in which the thread color has been changed (S22). In this case, the spool lamp and thread tension lamp both flashed emit the colored light of the changed thread color.
The operator then detaches the thread spool 29 corresponding to the flashed one of the spool lamps 32 to 37 and attaches the thread spool 29 corresponding to the flashed thread color to the spool pin stand 20 or 21, thereby preparing for threading. When the operator has operated the needle bar change-over switch so that the needle bar 8 form which the needle thread has been detached is located at a sewing position (S23: Yes), the control device 50 drives the needle bar changing motor 64 so that the needle bar changing mechanism carries out switching of the needle bar (S24). Subsequently, when the operator has operated the threading switch (S25: Yes), the control device 50 drives the threading motor 66 so that the threading mechanism carries out a threading process in which the needle thread is passed through the needle eye of the sewing needle 9 (S26). The control device 50 turns on one of spool lamps 32 to 37 and one of the thread tension lamps 42 to 47 both corresponding to the needle bar 8 having the threaded sewing needle (S27). In this case, the spool lamp and the thread tension lamp are lighted with respective colored light. Also, in this case, too, the control device 50 sets the lamp flags of the lighted lamps (flag data=1).
Subsequently, when one of the spool lamps 32 to 37 and one of the thread tension lamps 42 to 47 are flashed at S22 (S28: Yes), the control device 50 repeats S23 to S28. On the other hand, when no spool lamps 32 to 37 and no thread tension lamps 42 to 47 are flashed (S28: No), needle threads of six thread colors to be used in the subsequent sewing have been passed through the needle bars 8 respectively. Accordingly, the control device 50 carries out S16 and subsequent steps.
The following describes an operation for displaying a thread color of the needle thread in the embroidery sewing process. When the operator selects an embroidery pattern on a screen of the display 30a, the control device 50 reads out all the thread colors included in the embroidery data of the selected embroidery pattern, storing the read data on the sewing thread color memory of the RAM 53 in the order of readout. In this case, the control device 50 checks whether all the initial six thread colors stored on the sewing thread color memory have already stored on the needle bar thread color table of the flash memory 54.
More specifically, since six thread colors used in the previous embroidery sewing have been set in the needle bar thread color table, the control device 50 collates the thread colors on the sewing thread color memory with the six thread colors on the needle bar thread color table. As the result of collation, for example, in one case, the sewing thread color memory stores seven colors (orange, red, blue, green, yellow, purple and white) as shown in
The operator then detaches the thread spool 29 on the spool pin 22b of the spool pin stand 20 indicated by flashed light of white and attaches a thread spool 29 of white, thereby preparing for threading. The operator then operates the needle bar change-over switch. When the needle bar 8 of No. 1 sewing needle 9 has been selected, the operator operates the threading switch so that the needle thread of while is passed through the needle eye of the sewing needle 9. In this case, too, the operator can easily perceive the thread color to be changed by the colored light of white. Moreover, it can easily be perceived in which spool pins 22b to 27b of the first and second spool pin stands 20 and 21 the thread spool 29 should be changed. As a result, a correct one of the thread tension regulators 12 to 17 can be threaded.
When the needle bar thread color table of the previously used thread colors as shown in
As obvious from the foregoing, the multineedle embroidery sewing machine M comprises the needle bars 8 corresponding to a plurality of the sewing needles 9 provided for the sewing operation with use of a plurality of the needle threads, the first and second spool pin stands 20 and 21 each having a plurality of the spool pins 22b to 27b to which a plurality of the thread spools 29 corresponding to the needle bars 8 are attached respectively and a plurality of the thread tension regulators 12 to 17 provided on the thread passages leading from the spool pin stands 20 and 21 to the needle bars 8. The multineedle embroidery sewing machine M further comprises the ROM 52 storing sewing data and the first to sixth spool lamps 32 to 37 and the control device 50. In sewing a selected embroidery pattern, based on thread color data included in the sewing data, the control device 50 turns on the spool lamps 32 to 37 corresponding to a plurality of the spool pins 22b to 27b respectively so that the spool lamps 32 to 37 emit colored light of respective thread colors thereby to perform a displaying function. Accordingly, the operator can easily and exactly attach, to the spool pins 22b to 27b with respective thread colors displayed, the thread spools 29 of the same colors as indicated by thus displayed colored light without confusion among the other spool pins 22b to 27b.
A plurality of the thread tension regulators 12 to 17 are provided with the first to sixth thread tension lamps 42 to 47 respectively. Based on the thread color data included in the sewing data read from the ROM 52, the control device 50 turns on the first to sixth thread tension lamps 42 to 47 so that the lamps 42 to 47 emit the colored light of the thread colors corresponding to the spool pins 22b to 27b, thereby performing the displaying function. Accordingly, the operator can easily and exactly attach, to the thread tension regulators 12 to 17 with respective thread colors displayed, the thread spools 29 of the same colors as indicated by thus displayed colored light without confusion among the thread tension regulators 12 to 17.
Furthermore, the control device 50 changes the display modes of the spool lamps 32 to 37 from the lighting to the flashing according to the degree of preparation of the thread spools 29 attached to the first and second spool pin stands 20 and 21. Accordingly, the display mode is changed to the flashing even when the thread spools 29 are attached to the spool pins 22b to 27b as preparation before start of the sewing process, respectively or the thread spools 29 are changed during the sewing. Consequently, the operator can easily and quickly attach the thread spools 29 to the spool pins 22b to 27b which are displayed in a display modes differing from ordinary modes without confusion.
Furthermore, the first to sixth spool lamps 32 to 37 and first to sixth thread tension lamps 42 to 47 comprise full-color LEDs which are capable of emitting colored light of a plurality of colors, respectively. Accordingly, since colored light of a number of colors can be used in the displaying function, a number of thread colors can be indicated and the operator can plainly recognize the thread colors of the thread spools 29 to be attached to the spool pins 22b to 27b respectively and the colors of threads to be supplied to the thread tension regulators 12 to 17 respectively. Furthermore, since the first to sixth spool lamps 32 to 37 and first to sixth thread tension lamps 42 to 47 each comprising LED can be rendered smaller in size and are advantageous in an installation space and costs.
In the multineedle embroidery sewing machine M of the second illustrative example as shown in
Each of the liquid crystal displays 80 to 82 may be a color liquid crystal display. In this case, since thread colors can be color-displayed as well as the character information, visibility can further be improved.
The spool pin stand 85 has a connector 85d connectable to a connector (not shown) of the multineedle embroidery sewing machine M and a connecting code 85e. Thread color display data may be received from the multineedle embroidery sewing machine M. Furthermore, the spool pin stand 85 may be arranged so as to be supplied with power and data from another multineedle embroidery sewing machine.
The ROM 52 of the multineedle embroidery sewing machine M may store sewing data in the same manner as in the first illustrative example. Based on thread color information read from the ROM 52, the control device 50 may control a plurality of spool lamps so that a plurality of thread colors corresponding to the respective spool pins 85a to 85c are displayed by the spool lamps. In this case, too, since the thread color display data is received from the multineedle embroidery sewing machine M, a plurality of spool lamps are displayed by a plurality of thread colors corresponding to a plurality of spool pins 85a to 85c. Accordingly, the operator can easily and exactly attach, to the spool pins 85a to 85c with respective thread colors displayed, the thread spools 29 of the same colors as indicated by thus displayed colored light without confusion among the spool pins 85a to 85c.
Since the spool pin stand 85 is provided with full-color LEDs which are light-emitting units capable of emitting colored light of a plurality of colors, colored light of a number of colors can be displayed and accordingly, a number of thread colors can be indicated and the operator can plainly recognize the thread colors of the thread spools 29 attached to the respective spool pins 85a to 85c.
Furthermore, the spool pin stand 85 constructed as described above can be purchased as an optional part as the operator demands. Still furthermore, the spool pin stand 85 may be connected to single-needle embroidery sewing machines, household sewing machines which can sew embroidery patterns, sewing machines which can carry out ordinary sewing or the like.
Furthermore, liquid crystal displays may be provided instead of the spool lamps. In this case, the operator can exactly recognize the names of thread colors, color numbers and the like of the thread spools 29 to be attached to the respective spool pins 85a to 85c by the character information. In particular, even when a plurality of thread spools 29 to be attached to the respective spool pins 22b to 24b are very similar to each other or one another, the operator can attach the thread spools 29 to the respective spool pins 22b to 24b easily and quickly without error.
The present disclosure should not be limited to the foregoing illustrative examples. The illustrative examples may be modified or expanded as follows. Although the foregoing first to sixth spool lamps 32 to 37 and first to sixth thread tension lamps 42 to 47 comprise respective full-color LEDs in the foregoing examples, these lamps 32 to 37 and 42 to 47 may comprise various light-emitting devices or displays such as color lamps, organic electroluminescent (EL) displays, plasma displays, electronic paper or the like, so that the thread colors may be displayed in a variable manner by colored light or character information.
Various displays such as organic EL displays, plasma displays, electronic paper or the like may be employed, instead of the liquid crystal displays 80 to 82.
The foregoing description and drawings are merely illustrative of the principles of the present disclosure and are not to be construed in a limiting sense. Various changes and modifications will become apparent to those of ordinary skill in the art. All such changes and modifications are seen to fall within the scope of the invention as defined by the appended claims.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2006-101561 | Apr 2006 | JP | national |
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| Number | Date | Country | |
|---|---|---|---|
| 20070227421 A1 | Oct 2007 | US |
