EP3255194B1 - Marking device for specifying a position marker on a support seat for a workpiece - Google Patents

Description

The invention relates to a marking device according to the preamble of claim 1 and a sewing unit with a marking device.

From the DE 10 2007 019 944 A1 a generic marking device is known. Marker lights are adjustable by means of a vertical drive motor. When a rack is vertically moved, a holding member also moves in a vertical direction, which in turn is provided with a rotary drive motor for shifting a marker lamp perpendicular to a cloth feed direction. A gear is arranged on an output shaft of the rotary drive motor, which in turn meshes with a toothed shaft attached to a gear wheel. A lamp holder base is attached to the lamp drive shaft. She is holding the marker light. The holding member is also provided with a further rotary drive motor, which rotates another marker light during operation, so that a Aufstrahlposition the mark is moved in the Nähgutvorschubrichtung. On an output shaft of the further rotary drive motor, a helical thread groove is formed which is engaged with a gear attached to another lamp drive shaft. The other light drive shaft is held by the holding member. It holds another lamp holding base, which in turn carries the other marker light.

Other marking devices are from the DE 10 2007 019 945 A1 . DE 10 2007 020 161 A1 . DE 10 2007 041 085 A1 . JP 2008 188 148 A . JP 2002 336 568 A . JP 09 024 172 A . US 3,766,870 and US 2013/0139739 A1 known.

An object of the invention is to provide a marking device which is intended to improve and simplify the specification of a position marking on a bearing surface for a workpiece.

This object is achieved with a marking device according to claim 1.

According to the invention, a transmission is provided for converting a rotational movement of a drive device into a pivoting movement of a marker light. The drive device is operatively connected via the transmission to the marker light such that a resulting movement of the marker by less than 10%, in particular less than 8%, in particular less than 4%, in particular less than 1%, deviating linearly from a rotational movement of the drive device depends. In particular, this arrangement can be such that two angular function components stand out almost completely, so that the linear component of the resulting Movement of the position marker remains. This results in a good approximation linear relationship between the resulting movement of the position or light mark and the rotational movement of the drive device. This also applies to tilt angles, in which the approximation of small angles collapses, so that the sine or the tangent of an angle in radians can no longer be replaced by the angle itself. The linear dependence of the resulting movement of the position marking on the bearing surface, ie the distance covered by the position marking during pivoting of the drive device, with a deviation of less than 10% of the rotational angle of the rotational movement of the drive device is especially true for angles of rotation greater than 10 ° and applies even with swivel angles of the marker light greater than 10 ° and in particular at angles greater than 15 °, greater than 20 °, greater than 25 ° or greater than 30 °. Owing to the linear relationship between the resulting movement of the light marking and the rotational movement of the drive device, with a given position resolution of the rotational movement of the drive device, an advantageously high position resolution can be achieved in the position specification of the position marking. At an oblique incidence of the light mark on the support surface, the gear conversion is such that a given angle of rotation of the drive means only leads to a small change in angle of the angle of incidence of the light mark on the support surface. With steep and in particular practically vertical impact of the light mark on the support surface, the same rotational movement of the drive device, however, leads to a larger change in the pivot angle of the marker light. Due to the low linearity deviation can be dispensed with a correction of the position or light mark by a user. In particular, it is not necessary to actuate a shift key to adjust a shift amount between a target and an actual position of the position or light mark to correct. A correction program is not necessary.

In a marking device with a coupling element a structurally simple transmission is provided. It may be present exactly one coupling element, which mediates between a rotational movement of the drive device and the pivoting movement of the marker light. Advantageously, the coupling element is designed as a joint push arm. In an advantageous embodiment, the sliding arm can be designed telescopically. Alternatively or additionally, a carrier of the marker light, where the coupling element is hinged to the marker light, be designed telescopically. Such telescopic designs avoid a kinematic overdetermination of the transmission.

In a marking device with a guide area according to the claims, a structurally advantageous embodiment of the marker light is provided. The guidance area avoids kinematic overdetermination of the transmission. Advantageously, a portion or component of the transmission is linearly guided in the guide region of the marker light.

A marking device with a coupling element, which is rotatably connected at one end to the drive device and movably mounted at the opposite end in the guide region of the marker light, provides a structurally advantageous connection between the drive device and the marker light. Advantageously, the coupling element is connected at one end fixed to a drive shaft of the drive unit and movable with its opposite end in the guide region of the marker light, in particular linearly movable, stored. Advantageously, the end of the coupling element in the guide region of the marker light performs a linear movement.

Advantageously, the drive device is designed as a synchronous motor, in particular as a stepping motor, for example as a half-stepping motor.

Advantageously, the marker light is designed as a laser.

Preferably, the marking device is used in a sewing unit, wherein the workpiece is a sewing material.

A marking device according to claim 2 provides a structurally advantageous coupling element. Advantageously, the projection guide member is rotationally mounted on the coupling element and in the guide region of the marker light sliding.

In a marking device according to claim 3, a particularly accurate specification of a position marking on a bearing surface is ensured.

In a marking device according to claim 4, a particularly advantageous input of at least one support position and / or positions to be marked is provided. Advantageously, the input module has a touch operation. This ensures a particularly advantageous input.

Advantageously, the input module has a display in the form of a display, in particular in the form of a touch-sensitive display. As a result, a plurality of operating and selection menus for selecting at least one control command can be selected.

In a marking device according to claim 5, a particularly preferred embodiment of the marking device is provided. In particular, the distance between the pivot axis and the drive shaft axis during the pivoting movement of the marker light is constant. The holder of the marker light can be designed as a lever arm of a transmission of the marking device. The coupling element can be designed as a further lever element of the transmission.

The drive shaft axis is preferably driven by the drive device, in particular a rotary drive device, in particular a stepper motor.

In a marking device according to claim 6, a particularly preferred embodiment of the marking device is further improved. In an instantaneous position in which the pivot axis, the drive shaft axis and the coupling axis are aligned vertically above one another, the distance between the drive shaft axis and the coupling axis is approximately, half, in particular maximum 50%, maximum 45% or maximum 40% of the distance between the coupling axis and the pivot axis.

Another object of the present invention is to provide a sewing machine with a marking device.

This object is achieved with the features of claim 7.

According to the invention, it has been recognized that the specification of a position marking for a sewing material can be improved.

Advantageously, the marking device is arranged in the sewing unit such that a position marking can be specified on the support surface and the view of the sewing material is not hindered.

Advantageously, it is provided to provide a method for calibrating a marking device.

A method for calibrating a marking device comprises the method steps starting a first support position, storing position data of the first support position, approaching a second support position, storing position data of the second support position, approaching a third support position, storing position data of the third support position and interpolating partial distances between the first and third support position and second and third support position.

In particular, it has been recognized that calibration of the marking device can improve the local specification of a position marking on a bearing surface for a workpiece. Residual deviations of a linear relationship between the amount of rotational movement of the drive device and the resulting spatial movement of the position marker on the support surface can be corrected. Further action by a user to correct the position marker is not required. In particular, it is not necessary to determine a shift amount and to drive the drive device as a function of the shift amount.

In a method for calibrating a marking device, the first and second support positions are at the outer edge of the display area the marker light and the third support position is centered between the first and second support positions.

As a result, an advantageous arrangement of the support positions is provided. To further improve a local specification of a position marking on a support surface for a workpiece, more than three, in particular more than five, in particular more than ten, support positions may be provided.

Fig. 1

eine Vorderansicht der Markierungsvorrichtung,

Fig. 2

eine Seitenansicht der Markierungsvorrichtung nach Fig. 1,

Fig. 3

eine schematische Darstellung eines Eingabemoduls der Markierungsvorrichtung nach Fig. 1,

Fig. 4

in einer Fig. 1 ähnlichen Darstellung in einer Momentanposition der Markierungsvorrichtung an einer ersten Stützposition,

Fig. 5

in einer ähnlichen Darstellung nach Fig. 1 in einer Momentanposition der Markierungsvorrichtung an einer zweiten Stützposition,

Fig. 6

in einer ähnlichen Darstellung nach Fig. 1 im Momentanzustand der Markierungsvorrichtung an einer dritten Stützposition und

Fig. 7

in einer ähnlichen Darstellung nach Fig. 1 in einer Momentanposition der Markierungsvorrichtung an einer Positionsmarkierung zwischen der ersten und dritten Stützposition.

An embodiment of the present invention is based on the Fig. 1 to 7 be explained in more detail. In this show:

Fig. 1

a front view of the marking device,

Fig. 2

a side view of the marking device according to Fig. 1 .

Fig. 3

a schematic representation of an input module of the marking device according to Fig. 1 .

Fig. 4

in a Fig. 1 similar representation in an instantaneous position of the marking device at a first support position,

Fig. 5

in a similar representation Fig. 1 in an instantaneous position of the marking device at a second support position,

Fig. 6

in a similar representation Fig. 1 in the instantaneous state of the marking device at a third support position and

Fig. 7

in a similar representation Fig. 1 in an instantaneous position of the marking device at a position marker between the first and third support positions.

The following is based on the Fig. 1 and 2 an embodiment of the marking device will be explained in more detail. The marking device 1 is attached via a mounting pin 2 schematically shown in a system, not shown, in particular sewing unit. The marking device 1 comprises a drive device 3, a marker light 4 and a transmission 5. The drive device 3 is detachably connected to a mounting base 6. Advantageously, the releasable connection is designed as a screw connection. The drive device 3 has a projecting drive shaft 7. The drive shaft 7 is connected to the Gear 5 is connected, wherein the transmission 5 is executed in the embodiment shown as a coupling element in the form of a sliding arm 8. By the sliding arm 8, the drive device 3 is connected to the marker light 4.

The marker light 4 comprises a holder 9 and an emission unit 10. The holder 9 is fastened to the attachment base 6 via a hinge 11. Through the rotary joint 11 extends a rotation axis, hereinafter called the pivot axis, around which the marker light 4 can be rotated. The emitting unit 10 is advantageously designed as a laser. The emitting unit 10 is arranged in a receiving region 12 of the holder 9. Depending on the application of the marking device 1, the emitting unit 10 can be fastened detachably or non-detachably in the receiving region 12.

Adjacent to the receiving area 12, a guide area 13 is provided. In the guide area 13, one end of the sliding arm 8 is mounted linearly movable. For this purpose, a projection guide part 14 is provided. The projection guide member 14 is rotatably supported at the end of the slide arm 8 and slidably supported in the guide portion 13. For this purpose, the guide region 13 comprises a guide rail 13a, which is firmly bolted to a base body of the holder 9. Between the rail 13a and an opposite mating surface of the main body of the holder 9 of the guide portion 13 is formed in the form of a one-sided open linear guide for the projection guide member 14.

In the illustrated embodiment, one end of the slide arm 8 is fixedly connected to the drive shaft 7, so that at this end a hinge 15 is provided. Through the pivot 15 a further axis of rotation, hereinafter called the drive shaft axis, around which the sliding arm 8 can rotate. The axes of rotation of the two hinges 11, 15 are spaced apart. The pivot axis is arranged vertically aligned over the drive shaft axis. The sliding arm 8 is mounted with its opposite end by the projection guide member 14 in the guide portion 13 linearly movable. By the projection guide member 14 extends a coupling axis. The pivot axis is articulated via the coupling axis with the bracket 9. During the pivotal movement of the marker light 4, the distance between the pivot axis and the drive shaft axis remains constant. Whereas the distance between the coupling axis to the pivot axis and to the drive shaft axis changes. Basically, the distance between the drive shaft axis and the coupling axis is smaller than the distance between the coupling axis and the pivot axis. In a momentary position in which the pivot axis, the coupling axis and the drive shaft axis are aligned vertically above one another, the distance between the drive shaft axis and the coupling axis is approximately half the distance between coupling axis and pivot axis (cf. Fig. 6 ), in particular: the distance between the drive shaft axis and the coupling axis is a maximum of 50%, 45% or 40% of the distance between the coupling axis and pivot axis.

As a result, the drive device 3 is in operative connection with the marker light 4 via the slide arm 8 in such a way that a resulting movement of a position marker 16 on a support surface 17 is deviatingly linear from the rotational movement by less than 10%, in particular less than 5%, in particular less than 1% the drive device depends. The position of the position marker 16 is freely selectable within a display area.

Further, a position sensor 18 is provided, which is fixed adjacent to the receiving area 12 on the mounting base 6 (see. Fig. 2 ). The position sensor 18 is used to detect the position data of the position marker 16 and the marker light 4. The position sensor can be designed as an incremental encoder known from the prior art. To establish a reference position, a reference switch 19 is provided. The reference switch 19 can cooperate with the position sensor 18. The reference switch 19 is arranged adjacent to the marker light 4 as a function of the reference position to be preset. The reference position references the marking device 1 comparable to a reference position on a machine tool. The reference position can be outside a display area.

The Fig. 3 1 shows an input module 20 of the marking device 1. The input module 20 has a display 21 in the form of a display, in particular a touch-sensitive display, for displaying a plurality of operating and selection menus 22. The input module 20 is in bidirectional signal connection with selected components of the marking device 1, such as For example, the drive device 3, the marker light 4, the position sensor 18 and / or reference switch 19. The signal connection can be performed depending on the application of the marking device 1 wired or wireless.

Via the operating and selection menus 22 position data of a support position and / or a position to be marked can be entered. The input data is processed by a control and regulation unit 23, shown schematically. Subsequently, a switch-on signal is transmitted to the drive device 3. The detected data of the position sensor 18 are sent to the control unit 23 and adjusted with the entered nominal position. When the desired position is reached, a switch-off signal is transmitted to the drive device 3.

The following is based on the Fig. 4 to 7 a method for calibrating the marking device 1 will be described in more detail.

Before the actual calibration, the reference position is approached after switching on the marking device 1. This serves to calibrate and control the marking device 1. This referencing ensures that the support positions or support points can be accurately reproduced and approached. Subsequently, support positions 24, 26, 27 are approached as described below. The support positions 24, 26, 27 form the basis for the linear interpolation of the intermediate regions and are the basis for any desired position of the marker light 4.

To calibrate the marking device 1, a first support position 24 is approached. The support position 24 can be predetermined by the input module 20. The position data of the first support position 24 are stored in a memory unit 25 which is in signal communication with the control and regulation unit 23. Subsequently, a second support position 26 is selected via an operating and selection menu 22. Whereupon, the drive device 3 changes the rotation angle of the drive shaft 7 such that the marker light 4 is pivoted, so that the position marker 16 is displayed on the second support position 26. The position data is detected by the position sensor 18 and stored in the storage unit 25. Subsequently, a third support position 27 is entered via an operating and selection menu 22, so that the marker light 4 as described above, the third support position 27 drives and stores their position data in the memory unit 25. Finally, in each case a partial distance between the first support position 24 and the third support position 27 and between the second support position 26 and the third support position 27 is interpolated.

After completion of the calibration, arbitrary values can be approached within the display area, that is to say the first and second support positions 24, 26.

To start a support position 24, 26, 27 or a position marker 16, a switch-on signal is sent to the drive device 3, so that the drive shaft 7 rotates by a predetermined rotational angle φ. As a result, the sliding arm 8 is rotated by the same rotational angle φ about the rotary joint 15. As a result, the projection guide member 14 is rotated about its center axis and simultaneously moved linearly in the guide portion 13. About the projection guide member 14, the marker light 4 is pivoted about the pivot 11 by a rotation angle φ ', which depends nonlinear due to the action of the transmission 5 of the rotation angle φ and leads to a linearly dependent on the rotation angle φ translation of the position marker 16 on the support surface 17 ,

In other words, the gear 5 acts in such a way that the translation of the position marking 16 on the bearing surface 17 to a good approximation is linearly dependent on the rotational angle φ of the drive shaft 7. This ensures that over the entire display area a change in the rotational angle φ results in an approximately constant translation of the position marking 16. Thus, the resulting translation of the position marker 16 is, for example, when the rotation angle φ changes from 39 ° to 40 ° approximately the same as when changing the angle of rotation φ, for example, from 69 ° to 70 °.

Claims (7)

1. Marking device (19) to define a position marker (16) on a support surface (17) for a workpiece,

   - with a marking lamp (4) with a holder (9) to create a light marker, and

   - with a gear unit (5) to convert a rotational movement of the drive unit (3) into a pivoting movement of the marking lamp (4), the gear unit (5) having a coupling member (8),

   - the marking lamp (4) having a guide area (13) for guiding a translation of a portion of the gear unit (5),

   characterized in that

   - the coupling member (8) is, at one of its ends, non-rotationally connected to the drive unit (3) and, at the opposing end, is movably mounted in the guide area (13) of the marking lamp (4), and

   - the drive unit (3) is operatively connected, via the gear unit (5), with the marking lamp (4) in such a way that a resulting movement of the position marker (16) on the support surface (17) depends linearly on an angle of rotation of the rotational movement of the drive unit (3) with a deviation of less than 10%.
2. Marking device (1) as claimed in claim 1, characterized in that a protruding guide part (14) is arranged on the coupling member to guide the end of the coupling member in the guide area (13) of the marking lamp (4).
3. Marking device (1) as claimed in claim 1 or 2, characterized by a position sensor (18) to detect the position data of a position marker (16) and/or marking lamp (4).
4. Marking device (1) as claimed in any one of the preceding claims, characterized by an input module (20) to input at least one support position (24, 26, 27) and/or position marker.
5. Marking device (1) as claimed in any one of the preceding claims, characterized by

   - a rotary joint (11) with a pivot axis by means of which the holder (9) is hinged to a component (6), fixed to a frame, of the marking device (1),

   - another rotary joint (15) with a drive shaft axis by means of which the coupling member (8) is hinged to the component (6) that is fixed to the frame,

   the pivot axis being arranged vertically above and in line with the drive shaft axis.
6. Marking device (1) as claimed in claim 5, characterized in that the holder (9) of the marking lamp (4) is hinged to the coupling member (8) by means of a coupling pin of the protruding guide part (14), wherein a spacing between the drive shaft axis and the coupling pin is smaller than a spacing between the coupling pin and the pivot axis.
7. Sewing installation with a marking device (1) as claimed in any one of claims 1 to 6.

Images