Sewing – Special machines – Embroidering
Reexamination Certificate
2000-06-27
2001-01-09
Nerbun, Peter (Department: 3741)
Sewing
Special machines
Embroidering
C112S475190, C112S475110, C700S138000
Reexamination Certificate
active
06170413
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of Invention
The invention relates to a correction apparatus and correction method for sewing data to be used on a sewing machine that moves a needle bar upward and downward and a frame holding an object to be sewn in the X- and Y-axis directions to form a pattern on the object to be sewn.
2. Description of Related Art
There is a sewing machine that can form patterns on various kinds of objects to be sewn. For example, a sewing system for embroidering is designed to sew an embroidery pattern on a hat as an object to be sewn by moving a needle bar having a needle up and down and moving an attachment frame to which the hat is attached. The sewing system for embroidery comprises the attachment frame movable in the X- and Y-axis directions that cross each other, an actuator that drives the attachment frame, a needle bar movable upward and downward together with a needle, an actuator that drives the needle bar, and a controller that drives and controls each actuator. With regards to the attachment frame that holds a hat or cap, there are two types: one has two fixing portions that holds a hat both at a visor side and at a crown side; and the other has a single fixing portion that hold a hat only at a visor side. The controller, for example, drives and controls each actuator based on the sewing data read into an internal memory from an outside recording medium, to move the needle up and down and the attachment frame in the X and Y directions with the needle movement. To secure the movement amount in the X or Y direction, there is a structure in which the attachment frame is rotatable. Thus, as shown in
FIG. 9
, a specified embroidery pattern
72
is to be embroidered on a specified portion, e.g. the front, of a cap
71
attached to the attachment frame.
The controller processes the sewing data in accordance with a specified control program previously stored into the internal memory.
However, in the above-mentioned sewing system, the cap
71
is the main object to be sewn. The cap
71
has a substantially conical shape, and a diameter toward a crown side
71
a
is smaller than that toward a visor side
71
b
. Therefore, when the attachment frame is moved to move the cap
71
, the movement amount toward the crown
71
a
tends to become smaller than that toward the visor
71
b
. In particular, the arrangement in which the attachment frame is rotated in conformity to the shape of the cap
71
is more likely to show this tendency. Therefore, when an embroidery pattern
72
is embroidered on the cap
71
, the actual width of the pattern
72
becomes narrower in the direction from the visor side toward the crown side as shown in
FIG. 10
(
b
), in contrast to an expected pattern as shown in
FIG. 10
(
a
).
On the other hand, in the sewing system using the attachment frame that has only one fixing portion at the visor side
71
b
for fixing the cap
71
, when the cap
71
is moved along with the attachment frame, there is a possibility that the movement toward the crown side
71
a
becomes smaller than that toward the visor side
71
b
. This case also includes the above problem that the actual width of the sewn pattern is not equal at the visor side
71
b
and the crown side
71
a.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the invention to provide a correction apparatus and a correction method for sewing data so that a pattern can be sewn as the sewing data indicates without changing the shape of the pattern, unaffected by the shape of the object to be sewn and the movement of the attachment frame.
A correction apparatus for sewing data to be used on a sewing machine that forms a pattern on an object to be sewn by moving a needle up and down and a frame to which the object is attached in an X- and Y-axis directions, comprises a first device that reads the sewing data as an original data, the sewing data including X-axis direction movement data and Y-axis direction movement data, a second device that calculates X-axis coordinate data and Y-axis coordinate data of each stitch point based on the original data, and a third device that corrects the X-axis coordinate data based on a correction value, the correction value varying according to the Y-axis coordinate data of the stitch point.
In the above described correction apparatus, the sewing data is read into the correction apparatus as an original data. The coordinates of each stitch point are calculated from the original data. The data in the X-axis direction is corrected based on a correction value that varies according to the data in the Y-axis direction, and an execution data different from the original data is created.
Therefore, for example, when the problem comes from a shape of the object to be sewn, the movement amount of the object in the X direction at the forefront of the Y direction may become smaller than that at the root of the Y direction. In this case, the formation of the execution data due to the correction as described above acts effectively. In addition, when the problem comes from a fixing method of the object to the frame and the object is moved along with the frame, the movement of the object at the forefront in the Y direction may become inferior to the movement at the root in the Y direction. In this case, the formation of the execution data due to the correction as described above acts effectively. Namely, the X coordinate of each stitch point found above is corrected based on the correction value, which enables substantially equal movement amounts in the X-direction at the forefront and the root of the Y direction and equal displacements at the forefront and the root of the Y direction with respect to the frame.
In an exemplary embodiment of the correction apparatus according to the invention, a correction apparatus for sewing data to be used on a sewing machine, including a bed, that forms a pattern on a cap in a direction from a visor side to a crown side by moving a needle up and down and an frame to which the cap is attached in an X- and Y-axis directions, comprises a first device that reads the sewing data as an original data, the sewing data including X-axis direction movement data and Y-axis direction movement data, the Y-axis being in a direction of the length of the bed and the X-axis direction being a rotating direction on the Y-axis, a second device that calculates X-axis coordinate data and Y-axis coordinate data of each stitch point based on the original data, and a third device that corrects the X-axis coordinate data based on a correction value, the correction value varying according to the Y-axis coordinate data of the stitch point.
According to the correction apparatus described above, for example, the cap is substantially conical, and the diameter at the crown side is smaller than that at the visor side. When the movement amount of the X direction at the crown side becomes smaller than that at the visor side, the formation of the execution data due to the correction as described above acts effectively. In addition, when the problem comes from a fixing method of the cap to the frame and the cap is moved along with the frame, the movement amount of the cap in the X direction at the crown side of the Y direction may become inferior to that at the visor side. In this case, the formation of the execution data due to the correction as described above acts effectively. That is, the X coordinate of each stitch point found above is corrected based on the correction value, which enables substantially equal movement amounts in the X-direction at the crown side and the visor side and equal displacements at the crown side and the visor side with respect to the frame.
In the correction apparatus, the correction value is calculated using the coordinate data of the Y-axis direction as a variable and a correction parameter that can be changed as a constant.
Thus, the correction value is changed as the coordinate data of the Y-axis direction is changed. The change ratio of the correction value is changed in accordance with the change of the correction paramete
Brother Kogyo Kabushiki Kaisha
Nerbun Peter
Oliff & Berridg,e PLC
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