Sewing machine

Abstract

To properly present a range in which sewing is performed.SOLUTION: In a sawing machine 100 on which a marking light 50 is mounted for irradiating a needle location with slit light L, the marking light includes: a light emitting part for emitting slit light; a first shielding body 54 for shielding one end part of the slit light; and a second shielding body 55 for shielding the other end part of the slit light. The first shielding body can move and adjust a range that one end part shields along the longer direction of the slit light radiated to the needle location, and the second shielding body can move and adjust a range that is shielded of the other end part along the longer direction of the slit light radiated to the needle location.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a sewing machine equipped with a marking light. [Background technology]

[0002] When the sewing machine presser foot is pulled up to release the sewing object and the sewing object is placed on the needle plate, the needle hole is hidden, making it difficult to accurately determine the position where the sewing object will be sewn. Therefore, in order to solve the above problem, a marking light that illuminates the position where sewing is to be performed on a sewing object placed on the needle plate has been installed in the sewing machine (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Utility Model Application Publication No. 02-126580 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the marking light merely indicates a reference position relative to the position where stitching is to be performed. For this reason, for example, in the case of sewing in which the range to be sewn is fixed, it has not been possible to properly indicate the range.

[0005] An object of the present invention is to properly present the area to be sewn. [Means for solving the problem]

[0006] The present invention provides In a sewing machine equipped with a marking light that projects a slit of light onto the needle drop position, The marking light is a light emitting unit that emits slit light; a first shielding member that shields one end of the slit light; a second shielding body that shields the other end of the slit light; the first shielding member is movable to adjust the shielding range of the one end portion along the longitudinal direction of the slit light irradiated at the needle drop position, The second shielding body is movable so that the range of the other end portion that is shielded can be adjusted along the longitudinal direction of the slit light that is irradiated to the needle drop position. [Effects of the Invention]

[0007] The marking light according to the present invention can properly indicate not only the sewing position but also the sewing range. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a side view of a sewing machine according to an embodiment of the present invention. [Figure 2] 1 is a block diagram showing the overall configuration of a sewing machine. [Figure 3] FIG. 2 is a perspective view of the face side of the sewing machine. [Figure 4] 10 is a cross-sectional view taken along a cross section parallel to the optical axis of the slit light in the marking light and the X-axis direction. FIG. [Figure 5] Figure 5(A) shows an example of irradiated light in which the right end of the slit light is blocked and the length from the middle position is shortened, and Figure 5(B) shows an example of irradiated light in which the left end of the slit light is blocked and the length from the middle position is shortened. [Figure 6] 10 is a display example of a setting screen for sewing bar tacking, which is displayed on the display unit of the operation input unit. [Figure 7] FIG. 4 is an explanatory diagram illustrating an example of a sewing pattern and setting items in the sewing pattern. DETAILED DESCRIPTION OF THE INVENTION

[0009] [Outline of the embodiment] An embodiment of the present invention will be described with reference to the drawings. The sewing machine 100 of this embodiment is exemplified by a so-called bar tacking sewing machine. FIG. 1 is a side view of the sewing machine 100, FIG. 2 is a block diagram showing the overall configuration, and FIG. 3 is a perspective view of the face side of the sewing machine 100.

[0010] The sewing machine 100 has a needle up-down movement mechanism 20 that moves the needle bar 24 that holds the sewing needle up and down, a movement mechanism 40 that holds the sewing material and can position it arbitrarily on a plane along the needle plate, a shuttle mechanism, a marking light 50, a control device, and a sewing machine frame 10 that supports the entire sewing machine. The sewing machine 100 also has a thread tensioning device, a thread take-up mechanism, and a thread cutting device that are common to sewing machines, but these are the same as well-known components and therefore will not be described here. In the following description, when the sewing machine 100 is placed on a horizontal plane, the direction that coincides with the vertical direction is referred to as the Z-axis direction, one direction that is perpendicular to the other on the horizontal plane is referred to as the X-axis direction (the direction perpendicular to the plane of FIG. 1), and the other direction is referred to as the Y-axis direction (the left-right direction of the plane of FIG. 1). In addition, one end side in the Y-axis direction (the left side of the plane of FIG. 1) may be referred to as the "front," the other end side in the Y-axis direction (the right side of the plane of FIG. 1) may be referred to as the "rear," one end side in the X-axis direction (the left side of the plane of FIG. 4, which will be described later) may be referred to as the "left," and the other end side in the X-axis direction (the right side of the plane of FIG. 4) may be referred to as the "right."

[0011] [Sewing machine frame] The sewing machine frame 10 has a sewing machine bed section 11 extending along the Y-axis direction at the bottom of the sewing machine 100, an upright body section 12 that stands vertically from one end of the sewing machine bed section 11, and a sewing machine arm section 13 that extends from the upper end of the upright body section 12 in the same direction as the sewing machine bed section 11.

[0012] The entire sewing machine frame 10 is covered with a sewing machine cover, and a part of the sewing machine cover can be opened and closed to allow access to the inside of the sewing machine cover. For example, a face cover 14 that can be opened and closed via a hinge is provided on the face located at the front end of the sewing machine arm 13. A marking light 50 is stored in the inner space formed by the face cover 14. In order for the marking light 50 to project slit light L, which indicates the sewing position and sewing range, onto the upper surface of the needle plate below, a notch 141 is formed in the lower end of the face cover 14 so as not to block the slit light L. In other words, even when the face cover 14 is closed, the marking light 50 can project slit light L onto the needle plate or the lower plate 41, which will be described later.

[0013] [Needle vertical movement mechanism] The needle up / down movement mechanism includes a sewing machine motor 21, an upper shaft (not shown) that is rotated by the sewing machine motor 21, a needle bar 24 that supports the sewing needle 22 at its lower end, and a crank mechanism that converts the rotational movement of the upper shaft into forward movement along the Z-axis direction and applies it to the needle bar 24.

[0014] [Movement mechanism] The movement mechanism 40 includes a lower plate 41 placed on a plane along the XY plane of the sewing machine bed portion 11, a support frame 42 erected on the upper surface of the rear end of the lower plate 41, a bartack frame 47 supported on the front end of the front extension of the support frame 42 so that it can be raised and lowered, a presser lifting motor 31 that raises and lowers the bartack frame 47, and an X-axis motor 43 and a Y-axis motor 44 that move the bartack frame 47 in the X-axis and Y-axis directions as desired via the lower plate 41 and the support frame 42.

[0015] Bartacking frame 47 is located above the needle plate on the top surface of sewing machine bed 11. Bartacking frame 47 has a long rectangular opening formed vertically along the X-axis direction, and bartacking is performed inside this opening. Lower plate 41 has an opening at a position corresponding to the opening of lowered bartacking frame 47 and of the same size as this opening, so that the lowered bartacking frame 47 and lower plate 41 grip the workpiece, enabling sewing by needle penetration in this gripped state.

[0016] The Y-axis motor 44 applies a movement motion to the lower plate 41 along the Y-axis direction by a desired movement amount. The X-axis motor 43 applies a rotation motion around the Z-axis with the rear end of the lower plate 41 as the axis, thereby moving and positioning the front end of the lower plate 41 and the bartacking frame 47 along the X-axis. By cooperation of the X-axis motor 43 and the Y-axis motor 44, the bartacking frame 47 can be positioned arbitrarily along the XY plane, and bartacking can be performed according to a predetermined sewing pattern.

[0017] [Shuttle mechanism] Although not shown, the shuttle mechanism includes a shuttle located below the needle plate of the sewing machine bed 11, a shuttle shaft that rotates and drives the shuttle, and a transmission mechanism that transmits rotational power from the upper shaft to the shuttle shaft. The shuttle may be a vertical full-rotary shuttle, horizontal shuttle, or semi-rotary shuttle, but a vertical full-rotary shuttle is shown here as an example. The transmission mechanism may be a belt mechanism, a gear mechanism using bevel gears, or the like. The transmission mechanism transmits the rotation of the upper shaft at double the speed to the shuttle.

[0018] [Marking Light] As described above, the marking light 50 is housed inside the face cover 14 on the face of the sewing machine arm 13 . FIG. 4 is a cross-sectional view taken along a cross section parallel to the optical axis of the slit light L in the marking light 50 and the X-axis direction.

[0019] The marking light 50 has a light-emitting unit consisting of a light source 52 that emits parallel light using an LED 51 and a mask 53 that blocks part of the parallel light to form slit light L, a first shielding body 54 that blocks one end (left end) of the slit light L, a second shielding body 55 that blocks the other end (right end) of the slit light L, and a frame body 56 that supports the light-emitting unit, the first shielding body 54, and the second shielding body 55.

[0020] The frame 56 is fixedly supported on the front surface of the face of the arm 13 of the sewing machine. The frame 56 has a rectangular parallelepiped shape that is long in the X-axis direction, and has a through-hole 561 that penetrates from top to bottom. The light source 52 is attached to the upper end of the through-hole 561 with the light source 52 facing downward, and parallel light passes through the through-hole 561 and is projected downward. Strictly speaking, the optical axis of the light source 52 and the center line of the through hole 561 of the frame body 56 are both inclined diagonally downward and rearward, and are oriented in a direction that allows them to illuminate the needle drop position (needle hole) on the needle plate from the surface portion.

[0021] The mask 53 is a flat plate with a slit 531 formed along the X-axis direction, and is disposed immediately below the light source 52 within a through-hole 561 in the frame 56 to convert parallel light into slit light. Figures 5(A) and 5(B) show the slit light L projected onto the needle plate. Note that in these figures, the area in which part of the slit light L in the longitudinal direction is blocked by the first shielding member 54 or the second shielding member 55 is indicated by a dotted line. The slit light L irradiated through the mask 53 is parallel to the X-axis direction as shown in the figure, and the slit hole 531 is processed so that a short-axis light beam along the Y-axis direction is formed at the intermediate position Pc in the longitudinal direction when not shielded by the first shielding body 54 or the second shielding body 55. The position of this short-axis light beam then irradiates the position of the pinhole.

[0022] On each of the left and right side surfaces of the frame body 56, insertion holes 562, 563 for the first shielding body 54 and the second shielding body 55 are formed along the X-axis direction, reaching the through-hole 561 from the side surfaces. The cross-sectional shapes of the first shielding body 54 and the second shielding body 55 and the insertion holes 562, 563 are not particularly limited, but they are the same. If these cross-sectional shapes are perfect circles, rotation will occur, so it is preferable that they have other shapes. Here, a case where the cross section is approximately rectangular will be shown as an example.

[0023] The tip portions of the first shielding body 54 and the second shielding body 55 that are inserted into the insertion holes 562 and 563 respectively shield one end and the other end of the slit light L. The deeper the insertion depth of the first shielding body 54 and the second shielding body 55 into the insertion holes 562 and 563, the longer the range over which the corresponding end side of the slit light L is shielded, thereby shortening the corresponding end side of the slit light L that is irradiated onto the needle plate. 5A shows a state in which the right end of the slit light L is blocked by the second blocking member 55, and FIG. 5B shows a state in which the left end of the slit light L is blocked by the first blocking member . The first shielding body 54 is capable of adjusting the length of the left end (length from the intermediate position Pc) of the irradiated slit light L by adjusting the insertion depth thereof into the insertion hole 562. Similarly, the second shielding body 55 is capable of adjusting the length of the right end (length from the intermediate position Pc) of the irradiated slit light L by adjusting the insertion depth thereof into the insertion hole 562.

[0024] The first shielding body 54 and the second shielding body 55 both have a tip end on the insertion side that is sharp and wedge-shaped when viewed from the front. That is, the first shielding body 54 and the second shielding body 55 have a shape in which the thickness in the direction along the optical axis of the slit light L becomes thinner toward the tip end. Therefore, the thinnest tip portions of the first shielding body 54 and the second shielding body 55 shield the ends of the slit light L, so that the ends of the irradiated slit light L can be made clearer.

[0025] Furthermore, first screw holes 564, 564 are formed in the frame 56, perpendicular to the insertion holes 562, 563, and extending from the underside of the frame 56 to the insertion holes 562, 563. Springs 567, 567 that press against the first shield 54 and second shield 55 inserted into the insertion holes 562, 563 are housed in the first screw holes 564, 564, and are sealed by screws 565, 565. The pressure of the springs 567, 567 allows the first shield 54 and the second shield 55 to remain in the insertion holes 562, 563. The springs 567, 567 may have an elastic force that does not interfere with the position adjustment of the first shield 54 and the second shield 55 in the insertion direction. Furthermore, the first screw holes 564, 564 are formed from the lower surface of the frame body 56, but may be formed from any direction as long as they are perpendicular to the respective insertion holes 562, 563.

[0026] Further, second screw holes 568, 568 are formed on the front surface of the frame body 56, perpendicular to the insertion holes 562, 563, and extending from the front surface of the frame body 56 to the insertion holes 562, 563. Fastening screws 569, 569 serving as fastening members are threaded into the second screw holes 568, 568, and the tip of each fastening screw 569, 569 presses against the first shielding body 54 and the second shielding body 55, respectively, to hold them in their adjusted positions. The second screw holes 568, 568 and the fastening screws 569, 569 form a holding mechanism that fixes the first shielding body 54 and the second shielding body 55 in their moved positions. The fastening screws 569, 569 may be of the type that can be tightened with a tool such as a bolt, but are preferably of the type that can be tightened by hand, such as a screw with a knurled cylindrical portion or a thumbscrew. Furthermore, the second screw holes 568, 568 are formed from the front surface of the frame body 56, but may be formed from any direction other than the rear as long as they are perpendicular to the respective insertion holes 562, 563.

[0027] In addition, a sharp claw member may be placed at the tip of the spring 567, 567 placed in the first screw hole 564, 564, and the side surfaces of the first shield 54 and the second shield 55 that abut against the claw member may be provided with countless fine grooves lined up along their longitudinal direction, so that the claw member and each groove may fit together to form a latch mechanism that can position the first shield 54 or the second shield 55 in the X-axis direction. In this case, since the latch mechanism functions as a holding mechanism, the holding mechanism consisting of the second screw holes 568, 568 and the fastening screws 569, 569 may be omitted.

[0028] In addition, instead of the configuration of the first screw holes 564, 564 and springs 567, 567, rack teeth may be formed on the sides of the first shield 54 and the second shield 55 along their longitudinal direction, and an operating part such as a knob may be provided to manually rotate a pinion gear that meshes with the rack teeth, thereby adjusting the positions of the first shield 54 and the second shield 55. Alternatively, a worm gear may be meshed with the rack teeth, and an operating part such as a knob for manually rotating the worm gear may be provided, thereby adjusting the positions of the first shield 54 and the second shield 55. In the case of a configuration using a pinion gear, it is preferable to provide a holding mechanism consisting of second screw holes 568, 568 and fastening screws 569, 569, but in the case of a configuration using a worm gear, the rack teeth can be restrained, so the holding mechanism consisting of second screw holes 568, 568 and fastening screws 569, 569 may be omitted.

[0029] When using the rack-pinion mechanism or rack-worm mechanism, the pinion gear or worm gear may be driven by a motor. When using a motor, a ball screw mechanism may be used instead of the rack-pinion mechanism or rack-worm mechanism. Alternatively, a direct-acting actuator such as a linear motor may be used to omit the gear mechanism and move and position the first shield 54 and the second shield 55 individually along the X-axis direction. 2, the motor for adjusting the position of the first shielding body 54 in the X-axis direction is illustrated as a first motor 58, and the motor for adjusting the position of the second shielding body 55 in the X-axis direction is illustrated as a second motor 59. Naturally, when the positions of the first shielding body 54 and the second shielding body 55 in the X-axis direction are adjusted manually, these motors 58 and 59 can be omitted.

[0030] [Balance mechanism, etc.] The sewing machine 100 also includes a thread take-up mechanism, thread tensioner, thread cutter, and other components that are commonly found in sewing machines, but these are well-known structures and will not be described in detail here. The thread take-up mechanism in the sewing machine 100 is configured to receive power from the sewing machine motor 21 of the needle up-down movement mechanism 20, and operates the thread take-up in synchronization with the up-down movement of the needle bar 24.

[0031] [Sewing machine control system] 2, the sewing machine 100 is equipped with a control device 90 that controls the operation of each component. The sewing machine motor 21, the presser foot motor 31, the X-axis motor 43, and the Y-axis motor 44 are connected to the control device 90 via their respective motor drive circuits 21a, 31a, 43a, and 44a. Encoders 23, 33, 45, and 46 that detect the shaft angles of the output shafts are also provided in the sewing machine motor 21, the presser foot motor 31, the X-axis motor 43, and the Y-axis motor 44. These encoders 23, 33, 45, and 46 are also connected to the control device 90 via motor drive circuits 21a, 31a, 43a, and 44a.

[0032] Furthermore, when the marking light 50 is configured to include the first motor 58 and second motor 59 described above, these motors 58, 59 are also connected to the control device 90 via their respective motor drive circuits 58a, 59a. Furthermore, encoders 581, 591 that detect the shaft angle of the output shaft are also provided in each of the motors 58, 59. Note that when the first motor 58 and the second motor 59 are pulse motors and are driven by an operation amount based on a command indicating the operation amount from the control device 90, the encoders 581, 591 can be omitted.

[0033] The control device 90 includes a CPU 91, a ROM 92, a RAM 93, and a data memory 94, and executes various operational controls described below. The ROM 92 stores the basic system program. Furthermore, pattern data 941 for performing sewing based on a predetermined bartack sewing pattern is stored in the data memory 94. The data memory 94 is made up of a nonvolatile semiconductor memory such as a flash memory, EEPROM, or EPROM, but a storage such as an HDD may also be used. The CPU 91 executes a control program to control the sewing operation based on the pattern data 941. The RAM 93 is a memory that serves as a work area for the CPU 91.

[0034] Furthermore, an operation input unit 96 serving as a setting input device is connected to the control device 90 via an interface 96a. The operation input unit 96 includes a display unit 961 and an input unit arranged around the display unit 961. The operation input unit 96 may be configured as a so-called touch panel or touch screen in which a touch sensor is provided on the display unit 961.

[0035] FIG. 6 shows a state in which a setting screen G1 for sewing bar tacking is displayed on the display section 961 of the operation input section 96. There are a wide variety of bartack sewing patterns, and pattern data 941 is prepared for each of the sewing patterns. For example, examples include a general bartack in which one or more stitches are made in a straight line across the entire width in the X-axis direction of the sewing pattern and then a zigzag stitch is made on top of that across the entire width in the X-axis direction, and a line bartack in which linear stitches are made repeatedly across the entire width in the X-axis direction of the sewing pattern.

[0036] The setting screen G1 displays the currently selected sewing pattern design and its data number, the dimension of the set sewing pattern in the X-axis direction, the dimension of the set sewing pattern in the Y-axis direction, the sewing speed, and the like. The operation input unit 96 is also provided with a selection key K1 for selecting the data number or the type of setting parameter, a set value increase / decrease key K2, a set content confirmation key K3, and the like.

[0037] FIG. 7 is an explanatory diagram showing an example of a sewing pattern and setting parameters for the sewing pattern. The setting parameters that can be set from the operation input unit 96 include the selection of the type of sewing pattern, the dimension Pl of the sewing pattern in the X-axis direction, the dimension Pw of the sewing pattern in the Y-axis direction, and the sewing speed, as well as a length Pl1 from an intermediate position Pc that serves as a reference for the sewing pattern in the X-axis direction to one end (left end) of the sewing pattern in the X-axis direction, and a length Pl2 from the intermediate position Pc that serves as a reference for the sewing pattern in the X-axis direction to the other end (right end) of the sewing pattern in the X-axis direction. The reference intermediate position Pc coincides with the position directly below the needle when the workpiece is gripped by the bartacking frame 47 at the start of sewing. When the type of sewing pattern and the values ​​of the above parameters are set, they are registered in the data memory 94 as one piece of pattern data 941.

[0038] A pedal 95, which is depressed to start and stop sewing and input other commands, is connected to the control device 90 via an interface 95a. However, the pedal 95 is not essential to the sewing machine 100 and may be omitted from the configuration.

[0039] [Sewing operation by sewing machine (1)] A description will be given of a configuration in which the positions of the first shielding body 54 and the second shielding body 55 of the marking light 50 are manually adjusted. First, the sewing machine operator selects the pattern data 941 and, from the settings of the pattern data 941 displayed on the display unit 961, determines the length Pl1 from the intermediate position Pc to one end of the sewing pattern in the X-axis direction and the length Pl2 from the intermediate position Pc to the other end of the sewing pattern in the X-axis direction.

[0040] Then, the face cover 14 is opened, the fastening screws 569, 569 of the marking light 50 are loosened, and the first shielding body 54 and the second shielding body 55 are moved along the X-axis direction. When the first shielding member 54 is moved to the right, the left end of the slit light beam L is shielded, and the length from the intermediate position Pc is shortened, as shown in Fig. 5(B). Similarly, when the second shielding member 55 is moved to the left, the right end of the slit light beam L is shielded, and the length from the intermediate position Pc is shortened, as shown in Fig. 5(A). Therefore, the first shield 54 and the second shield 55 are positioned so that the set value of the length Pl1 from the intermediate position to one end of the sewing pattern and the set value of the length Pl2 from the intermediate position to the other end of the sewing pattern are the same, and the positions of the first shield 54 and the second shield 55 are fixed by tightening each fastening screw 569, 569.

[0041] When the face cover 14 is closed and the bar tacking frame 47 is raised by operating the pedal 95, the CPU 91 of the control device 90 of the sewing machine 100 turns on the LED 51 of the marking light 50 and irradiates the needle plate (or lower plate 41) with slit light L, the left and right ends of which are adjusted to a predetermined length in accordance with the settings of the selected pattern data 941. While observing the position where the slit light L is irradiated, the operator places the sewing material on the needle plate and depresses the pedal 95 to start sewing.

[0042] When the pedal 95 is depressed, the CPU 91 turns off the LED 51 of the marking light 50 and controls the presser lifting motor 31 to lower the bartacking frame 47, so that the lower plate 41 and the bartacking frame 47 grip the sewing material. Furthermore, the CPU 91 starts rotating the sewing machine motor 21 so as to achieve the set sewing speed, and controls the X-axis motor 43 and the Y-axis motor 44 to transport the workpiece to each of the set needle drop positions in order in accordance with the type of sewing pattern set in the pattern data 941 and the set values ​​of each parameter, thereby performing bar tack stitching.

[0043] When sewing is completed for all needle drop positions, the sewing machine motor 21 is stopped, the bartacking frame 47 is raised, and the workpiece is released. If a thread cutting device is provided, the thread is cut before the workpiece is released. Furthermore, although the control example in which the LED 51 of the marking light 50 is turned off at the start of sewing has been shown, the LED 51 may be turned on and the slit light L may continue to be emitted during sewing.

[0044] [Sewing by sewing machine (2)] A configuration including a first motor 58 and a second motor 59 for moving the positions of the first shielding body 54 and the second shielding body 55 of the marking light 50 will be described.

[0045] First, when the sewing machine operator selects the pattern data 941, the CPU 91 acquires the length Pl1 from the intermediate position Pc to one end of the sewing pattern in the X-axis direction and the length Pl2 from the intermediate position Pc to the other end of the sewing pattern in the X-axis direction. As a result, the CPU 91 drives the first motor 58 in accordance with the set value of the length Pl1 from the intermediate position to one end of the sewing pattern, and positions the first shielding body 54 at a position where it shields one end of the slit light L so that the length from the intermediate position Pc to one end of the sewing pattern is Pl1. Similarly, the CPU 91 drives the second motor 59 in accordance with the set value of the length Pl2 from the intermediate position Pc to the other end of the sewing pattern, and positions the second shielding body 55 at a position where it shields the other end of the slit light L so that the length from the intermediate position Pc to the other end of the sewing pattern is Pl2.

[0046] It is preferable that the control device 90 prepares in the data memory 94 table data defining the correspondence between the set value of the length Pl1 and the corresponding operating amount of the first motor 58 for moving the first shielding body 54 to the appropriate position, and table data defining the correspondence between the set value of the length Pl2 and the corresponding operating amount of the second motor 59 for moving the second shielding body 55 to the appropriate position. When controlling the operations of the first motor 58 and the second motor 59, the CPU 91 performs the positioning operation of the first shield 54 and the second shield 55 by referring to the respective table data.

[0047] Then, the CPU 91 of the control device 90 of the sewing machine 100 turns on the LED 51 of the marking light 50, and irradiates the needle plate (or the lower plate 41) with slit light L, the left and right ends of which have been adjusted to a predetermined length, in accordance with the settings of the selected pattern data 941. The face cover 14 may remain closed throughout the operation. While observing the position where the slit light L is irradiated, the operator places the sewing material on the needle plate and depresses the pedal 95 to start sewing.

[0048] The subsequent operation of the sewing machine 100 is the same as the sewing operation (1) by the sewing machine, and therefore the explanation will be omitted.

[0049] [Technical effects of sewing machines] The marking light 50 of the sewing machine 100 comprises a first shielding body 54 that shields one end of the irradiated slit light L and a second shielding body 55 that shields the other end of the slit light L, the first shielding body 54 being movable to adjust the range of shading at one end along the longitudinal direction of the slit light L irradiated at the needle drop position, and the second shielding body 55 being movable to adjust the range of shading at the other end along the longitudinal direction of the slit light L irradiated at the needle drop position. Therefore, even when the bar-tacking frame 47 is retracted upward, the sewing position relative to the sewing object can be recognized from the irradiation position of the slit light L, and the range to be sewn can also be recognized from the length of the slit light L. Therefore, the worker can place the sewing material in the correct position, and can accurately perform bar tacking at the target position.

[0050] In addition, the marking light 50 is stored and arranged inside the face cover 14 of the sewing machine cover. This prevents the marking light 50 from being arranged in an exposed state outside the sewing machine 100, prevents the marking light 50 from getting in the way, and improves the ease of sewing.

[0051] In addition, the first shielding body 54 and the second shielding body 55 both have sharpened tips that block the slit light L so that the thickness in the direction of travel of the slit light is reduced, thereby preventing the edges of the irradiated slit light from becoming unclear and making it possible to irradiate clear slit light.

[0052] Furthermore, since the first shield 54 and the second shield 55 are provided with a holding mechanism that fixes them in their respective positions after they are moved, it is possible to prevent the first shield 54 and the second shield 55 from shifting out of position due to disturbances such as sewing work, and it is possible to irradiate the slit light L at the correct position for a long period of time even when repeatedly performing bar tack stitching.

[0053] If the holding mechanism for the first shielding body 54 and the second shielding body 55 is configured to have fastening screws 569, 569 that are manually operated to fix the first shielding body 54 or the second shielding body 55, the first shielding body 54 and the second shielding body 55 can be properly held in position with a simple configuration and simple operation.

[0054] Furthermore, if the marking light 50 is configured to have a first motor 58 that moves and positions the first shielding body 54 to any position, and a second motor 59 that moves and positions the second shielding body 55 to any position, the positions of the first shielding body 54 and the second shielding body 55 can be appropriately adjusted by motor control.

[0055] Furthermore, the CPU 91 of the control device 90 controls the first motor 58 and the second motor 59 based on pattern data 941, which is setting data that defines the sewing range and dimensions, to adjust the blocked range of one end and the blocked range of the other end along the longitudinal direction of the slit light L within the range corresponding to the pattern data 941. Therefore, by setting various parameters for the pattern data 941 or by preparing pattern data 941 with parameters already set, the lengths of both ends of the slit light L can be adjusted appropriately without the need for an operator to perform any adjustment work. Therefore, the operability of the sewing machine can be improved and proper bar tacking can be performed.

[0056] [others] The above describes the embodiments of the present invention. However, the present invention is not limited to the above embodiments. For example, in the embodiments, a component integrally formed from a single member may be replaced with a component divided into multiple members that are connected or fixed to each other. Furthermore, a component formed by connecting multiple members may be replaced with a component integrally formed from a single member. In addition, the details shown in the embodiments may be modified as appropriate without departing from the spirit of the invention.

[0057] For example, the above-described configuration of the marking light 50 being mounted on a bar-tacking sewing machine has been exemplified, but the marking light 50 is not limited to bar-tacking sewing machines, and can be applied to any sewing machine that contributes to the alignment of the workpiece by emitting slit light L adjusted to any length. For example, welt stitch machines, buttonhole stitch machines, eyelet stitch machines, etc. sew within a range of a target length, so the marking light 50 can accurately indicate the range and position of the stitching with a slit light. [Explanation of symbols]

[0058] 10 Sewing machine frame 14 Face cover 50 Marking Light 52 Light source 53 Mask 54 First shield 55 Second shield 56 Frame 569,569 Fastening screws 58 First Motor 59 Second motor 90 Control device 91 CPU 94 Data Memory 96 Operation input section 100 sewing machines 941 Pattern Data 961 Display section G1 setting screen K1 Selection key K2 Increase / Decrease Key K3 Enter key L slit light PC intermediate position Pl dimensions Pw dimensions

Claims

1. In a sewing machine equipped with a marking light that projects a slit of light onto the needle drop position, The marking light is a light emitting unit that emits slit light; a first shielding body that shields one end of the slit light; a second shielding body that shields the other end of the slit light, the first shielding member is movable to adjust the shielding range of the one end portion along the longitudinal direction of the slit light irradiated at the needle drop position, The sewing machine is characterized in that the second shielding body is movable so that the range of the other end that is shielded can be adjusted along the longitudinal direction of the slit light that is irradiated to the needle drop position.

2. 2. The sewing machine according to claim 1, wherein the marking light is stored inside a sewing machine cover.

3. The sewing machine according to claim 1, characterized in that the first shielding body and the second shielding body each have a tip that blocks the slit light and is sharpened so that the thickness in the direction of travel of the slit light is thin.

4. 2. The sewing machine according to claim 1, further comprising a holding mechanism for holding the first shield and the second shield in fixed positions after they are moved.

5. The sewing machine according to claim 4, wherein the holding mechanism includes a fastening member that is manually operated to fix the first shield or the second shield.

6. 2. The sewing machine according to claim 1, wherein the marking light has a first motor for moving and positioning the first shielding member to an arbitrary position, and a second motor for moving and positioning the second shielding member to an arbitrary position.

7. a control device that controls the first motor and the second motor, The sewing machine according to claim 6, characterized in that the control device controls the first motor and the second motor based on setting data that defines the sewing range or dimensions, and adjusts the blocked range of the one end and the blocked range of the other end along the longitudinal direction of the slit light within a range corresponding to the setting data.

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