Sewing – Special machines – Positionable work carrier
Reexamination Certificate
2000-04-17
2001-12-04
Izaguirre, Ismael (Department: 3765)
Sewing
Special machines
Positionable work carrier
Reexamination Certificate
active
06325008
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a sewing machine which is provided with Y-direction drive mechanisms for moving a drive frame for tensing and holding a cloth to be worked, on the table of the sewing machine in the back and forth directions of the sewing machine.
2. Description of the Related Art
FIG. 8
shows a conventional sewing machine
50
which is provided with Y-direction drive mechanisms. This sewing machine
50
is provided for stitching both a cylindrical cloth and a flat cloth and is constructed to include: a lower frame
51
extending in a direction X (i.e., in the right-and-left directions of the sewing machine
50
) and supported generally horizontally; a table
52
supported generally horizontally on said lower frame
51
; an upper frame
53
erected over said table
52
and in parallel with the lower frame
51
; a pair of machine heads
54
arrayed in the direction X in front of said upper frame
53
; a pair of beds
55
arrayed on the lower frame
51
in such a manner to correspond to the individual machine heads
54
as to have upper faces generally flush with the upper face of the table
52
; a drive frame
56
placed on the table
52
; a pair of Y-direction drive mechanisms
57
for moving said drive frame
56
on the table
52
in a direction Y; and an X-direction drive mechanism
58
for moving the same in the direction X.
The bed
55
is provided with a base portion
55
a
supported on the lower frame, and a cylindrical portion
55
b
extending forward from said base portion
55
a
. The table
52
is composed of a stationary portion
52
a
arranged from the back side to the left and right side portions of the sewing machine
50
, and a lift portion
52
b
arranged in a front side recess of said stationary portion
52
a
. The lift portion
52
b
can be moved downward from the bed
55
so that the flat cloth and the cylindrical cloth can be worked, respectively, in the states where the lift portion
52
b
is moved upward and downward.
The Y-direction drive mechanisms
57
are so disposed below the stationary portion
52
a
on the left and right sides of the lift portion
52
b
, respectively, that they may not interfere with the vertically moving lift portion
52
b
of the table
52
. The both Y-direction drive mechanisms
57
are individually jointed through slits
52
c
, which are formed through the table
52
to extend in the direction Y, to the end portions of a root portion
59
of the drive frame
56
, as extending in the right-and-left directions of the sewing machine
50
. The root portion
59
has the X-direction drive mechanism
58
for driving a frame portion
60
of the drive frame
56
in the right-and-left directions of the sewing machine
50
.
If the number of the machine heads
54
is increased, however, the distance between the two Y-direction drive mechanisms
57
is enlarged so that the root portion
59
of the drive frame
56
is liable to deflect at its central portion
59
a
when the Y-direction drive mechanisms
57
are actuated. When the drive frame
56
is driven in the direction Y, therefore, the central portion
59
a
of the root portion
59
seriously vibrates to raise a problem that the positioning accuracy of the drive frame
56
is lowered.
SUMMARY OF THE INVENTION
An object of the invention is to provide a sewing machine capable of driving a drive frame precisely.
According to an aspect of the invention, there is provided a sewing machine comprising: a drive frame to be mounted on the table of the sewing machine; and at least two Y-direction drive mechanisms arranged at a spacing in the right-and-left directions of the sewing machine for driving said drive frame in the back-and-forth directions of the sewing machine, characterized: by comprising an upper frame erected on said table; and in that each of said Y-direction drive mechanisms includes a rail mounted on said upper frame and extending in the back-and-forth directions of the sewing machine, a moving portion mounted on said rail slidably in the back-and-forth directions of the sewing machine and jointed to said drive frame, and a drive portion for driving said moving portion in the back-and-forth directions of the sewing machine.
The aforementioned sewing machine can be exemplified by a mode in which said Y-direction drive mechanisms are provided by two and are individually arranged inside, as seen in a top plan view, of the left and right end portions of said drive frame (that is, said Y-direction drive mechanisms are individually arranged inside of said drive frame in the right-and-left directions of the sewing machine).
On the other hand, there can be exemplified by a mode in which said Y-direction drive mechanisms are constructed to have their back end portions floating from said table so that they may not limit the movement of said drive frame backward of the sewing machine.
On the other hand, said sewing machine can be exemplified by a mode in which at least one of said Y-direction drive mechanisms is arranged inside, as seen in a top plan view, of the left and right end portions of said drive frame and constructed to have its back end portion floating from said table so that it may not limit the movement of said drive frame backward of the sewing machine.
On the other hand, said sewing machine can be exemplified by a mode in which said Y-direction drive mechanisms are provided by two, in which said table is constructed such that its front side portion in front of beds can be moved downward or removed, and in which said Y-direction drive mechanisms are individually arranged inside, as seen in a top plan view, of the left and right end portions of the front side portion of said beds.
On the other hand, there can be exemplified a mode in which said table is constructed such that its front side portion in front of beds can be moved downward or removed, in which at least one of said Y-direction drive mechanisms is arranged inside, as seen in a top plan view, of the left and right end portions of the front side portion of said beds and is constructed to have its back end portion floating from said table so that it may not limit the movement of said drive frame backward of the sewing machine.
The state in which the back end portion of said Y-direction drive mechanism floats from the table should not be especially limited, but can be exemplified by a mode in which the back end portion of the Y-direction drive mechanism is not jointed to said table or the machine frame below the upper face of said table.
The positions at which said Y-direction drive mechanisms are arranged should not be especially limited but are preferably located where the deflection of the entire drive frame can be made as small as possible.
Further objects of this invention will become evident upon an understanding of the illustrative embodiments described below. Various advantages not specifically referred to herein but within the scope of the instant invention will occur to one skilled in the art upon practice of the presently disclosed invention. The following examples and embodiments are illustrative and not seen to limit the scope of the invention.
REFERENCES:
patent: 5081944 (1992-01-01), Nakanishi
patent: 5553565 (1996-09-01), Ono et al.
patent: 5809918 (1998-09-01), Tajima et al.
patent: 5887536 (1999-03-01), Hayashi
Izaguirre Ismael
Kabushikikaisha Barudan
Pillsbury & Winthrop LLP
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