Sewing – Special machines – Embroidering
Reexamination Certificate
2001-07-13
2003-02-25
Nerbun, Peter (Department: 3765)
Sewing
Special machines
Embroidering
C112S470180
Reexamination Certificate
active
06523487
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a headgear frame apparatus attached removably to the drive frame of a sewing machine for clamping a headgear.
2. Description of Related Art
As shown in
FIGS. 6 and 7
, a headgear frame apparatus
105
of the prior art is provided with: a headgear frame
100
for clamping a headgear
1
; a rotary drive frame
106
for fitting the headgear frame
100
replaceably on the sewing machine side; a support frame
109
for supporting the rotary drive frame
106
turnably; and a guide plate
110
fixed on the support frame
109
and extending to the side of a cylindrical bed
111
of the sewing machine.
When this headgear frame apparatus
105
is to be attached to a drive frame
112
of the sewing machine, a mounting bracket
113
is fixed on the upper face of the drive frame
112
. On the back face of the bracket
113
, there is mounted a rotationally driving slide rail
114
having a rail groove
114
a,
to which the support frame
109
is connected through a bearing roller
115
.
In the headgear frame apparatus
105
thus far described, it is simple to attach the support frame
109
, however a clearance
116
never fails to be formed between the rail groove
114
a
and the bearing roller
115
so that it causes a longitudinal looseness exerting an adverse affect on the embroidering quality. At a high speed run (e.g., at 750 rpm), moreover, the support frame
109
or the headgear frame
100
vibrates to cause a frequent breakage of the needle or an unsatisfactory embroidery finish.
Therefore, the present inventors have proposed an improvement (Japanese Patent Application No. 11-106172, although not opened at the time of this application), as shown in FIG.
8
. In this proposal, the support frame
109
is constructed of a front member
205
positioned on the front side of the drive frame
112
, and a rear member
206
positioned on the rear side of the drive frame
112
. Moreover, a front bearing roller
208
mounted rotatably on the front member
205
and a rear bearing roller
207
mounted rotatably on the rear member
206
clamp the drive frame
112
longitudinally, and the front member
205
and the rear member
206
are jointed by inserted and fastened a joint screw
210
, as threaded in one of them, into a U-shaped groove
209
formed in the other. This structure has succeeded in eliminating the looseness of the support frame
109
or the headgear frame
100
to solve the above-specified problem.
When the headgear frame apparatus
105
of the proposal is to be attached to the drive frame
1112
, however, the operator is required to manipulate the rear member
206
to below or backward of the drive frame
112
and to join the front member
205
and the rear member
206
while applying the rear bearing roller
208
to the rear face of the drive frame
112
. This is a work at a rather backward deep position, as viewed from the front of the headgear frame apparatus
105
while groping, thus leaving a problem of poor workability.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a headgear frame apparatus which can solve the above-specified problems and can be attached easily without any looseness to the drive frame of a sewing machine.
According to the present invention, there is provided a headgear frame apparatus adapted to be removably attached to a drive frame adapted to be driven transversely and longitudinally of a sewing machine and extending transversely, comprising: a mounting base frame attached removably to the front side of the drive frame and adapted to be driven transversely and longitudinally together with the drive frame; a support frame connected to the mounting base frame such that it is driven with the mounting base frame longitudinally but not transversely; a rotary frame supported rotatably on the support frame; a headgear frame fitted removably on the rotary frame for clamping a headgear; and a rotation converting member interposed between the mounting base frame and the rotary frame for converting the transverse motions of the mounting base frame into rotations of the rotary frame, wherein the mounting base frame includes a guide face confronting the drive frame front face of the drive frame from the front and extending transversely, and wherein one or more front bearing roller for abutting against the guide face and one or more rear bearing roller for abutting against the drive frame front face are rotatably borne on the support frame respectively.
It is preferred that there is further comprised roller span adjusting means for holding the front bearing roller and the rear bearing roller with their pivot pins having a longitudinal span expanded, to bring the front bearing roller and the rear bearing roller individually into abutment without any looseness against the guide face and the drive frame front face.
The roller span adjusting means should not be limited to a specific structure but can be exemplified by the following modes i) and ii).
i) The mode in which the roller span adjusting means includes: an adjusting lever supporting the pivot pin of the front bearing roller or the rear bearing roller and hinged turnably to the support frame; and lever holding members for stopping and holding the adjusting lever at the rotation adjusted position on the support frame. It is preferred that the adjusting lever is so disposed that it can be manipulated by an operator from the front of the headgear frame apparatus.
ii) The mode in which the roller span adjusting means is one or more spring for urging both or one of the pivot pins of the front bearing roller and the rear bearing roller in a direction to expand the longitudinal span of the both pivot pins.
There can be exemplified the mode, in which one of the front bearing roller and the rear bearing roller is provided by one whereas the other is provided by two or more; or the mode in which both of them are provided by two or more respectively.
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: 6273012 (2001-08-01), Hattori et al.
patent: 6279498 (2001-08-01), Hattori et al.
Hattori Osamu
Ozeki Masahiko
Kabushikikaisha Barudan
Nerbun Peter
Pillsbury & Winthrop LLP
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