Knitting member selecting actuator of knitting machine

Details Knitting member selecting actuator of knitting machine Knitting member selecting actuator of knitting machine

2002-09-18

2003-07-01

Worrell, Danny (Department: 3765)

Textiles: knitting

Independent-needle machines

Straight

C066S219000

Reexamination Certificate

active

06584810

ABSTRACT:

TECHNICAL FIELD
The present invention relates to an actuator used for selecting knitting members, including a selector and a knitting needle, built in a knitting machine.
BACKGROUND ART
A large number of knitting needles are arranged in series on a needle bed of a knitting machine. The knitting needles are selected in accordance with knitting data by a selection device which is mounted on a carriage to move in reciprocation over the needle bed and are operated accordingly, so as to knit a certain pattern, such as a jacquard pattern and a structure pattern. Needle selection actuators built in the needle selection device fall into two types. One is the type of selecting needles by making a magnetic attraction holding of the selectors associated with the needles necessary for the knitting by energizing coil magnetic poles. Another one is the type of selecting needles by releasing the magnetic attraction holding of the selectors associated with the needles necessary for the knitting by energizing the coil magnetic poles. Of these two types, the former one is called “the electromagnet-energized magnetic attraction holding”, and the latter one is called “the electromagnet-energized magnetic attraction release”. The present invention is directed to the latter type of needle selection device.
FIG. 4
shows a vertical sectional view of a needle bed and a carriage of a flat knitting machine using the electromagnet-energized magnetic attraction release type electromagnet for the needle selection actuator.
FIG. 5
shows a view of the needle selection actuator as viewed from the attraction surface side.
FIG. 6
shows a sectional view taken along line vi—vi of FIG.
5
.
FIG. 7
shows a sectional view taken along line vii—vii of FIG.
5
.
Knitting members, such as a needle
72
, a needle jack
73
, a select jack
74
and a selector
75
, are slidably accommodated in needle grooves formed in a needle bed
71
. The selector
75
is inserted in the needle groove, with its elastic leg
79
compressed and deformed between bands
77
,
78
and the selector jack
74
which are fitted in the needle bed
71
, so that its armature
83
which is magnetically attracted by a needle selection actuator
81
can always be biased upwardly so as to release from the needle selection actuator
81
.
The needle selection actuator
81
is fixed to a bracket
92
mounted on the bottom of a cam plate
91
of a carriage
90
through a flange
86
mounted on a case
85
. Attraction surfaces
111
a
,
111
b
of the needle selection actuator
81
confront the armature
83
of the selector. When the carriage
90
is moved in reciprocation for knitting, a butt
95
of the selector
75
is pressed into the needle groove against the upward biasing force from the elastic leg
79
of the selector by a selector return cam (not shown) mounted on the cam plate
91
of the carriage confronting the selector
75
. This puts the armature
83
into a position where the armature
83
is magnetically attracted and held on the attraction surfaces
111
a,
111
b
of the needle selection actuator
81
. Along with the movement of the carriage
90
, the armature
83
is led to a needle selection part in that state. When the armature of the selector corresponding to a required knitting needle reaches the position over the coil magnetic pole of a first needle selection part or a second needle selection part, the coil magnetic poles are energized to cancel out magnetic flux of permanent magnet, so as to release the armature
83
from the attraction surface. As a result of this, the butt
95
of the selector is raised up over the needle bed to engage with a raising cam (not shown) of the trailing selector, so as to advance and push the select jack up to its intermediate position or its advanced position. The raising cam is mounted on each of the first needle selection part and the second needle selection part. The distance the selector is pushed up by the raising cam varies depends on the raising cam selected. The first raising cam serves to push the selector jack up to the intermediate position and the second raising cam serves to push the selector jack up to the advanced position. This can provide the three-way knitting, i.e., knit, tuck and miss, within a single course.
To make the required needle selection for this three-way knitting, the needle selection actuator
81
is provided, in its case
85
, with a first controlled attraction region
105
and a second controlled attraction region
106
, each including coil magnetic poles in its magnetic circuit, and three uncontrolled attraction regions
107
,
108
and
109
which include no magnetic pole in their magnetic circuits. Each of the attraction regions has the flat attraction surfaces
111
a
(
133
a,
116
a,
143
a,
126
a,
153
a
) and
111
b
(
133
b,
116
b,
143
b,
126
b,
153
b
) arranged in two rows at sides thereof confronting the armature
83
of the selector.
The controlled attraction regions
105
,
106
comprise permanent magnets
113
,
123
disposed on the base of the case
85
and coil magnetic poles
115
a;
115
b,
124
a;
124
b
which confront each other across the permanent magnets and around which coils
114
a;
114
b
,
124
a;
124
b
are wound. The coil magnetic poles have, on front ends thereof, attraction surfaces
116
a;
116
b,
126
a;
126
b
(the first needle selection part and the second needle selection part). The uncontrolled attraction regions
107
-
109
comprise permanent magnets
131
,
141
,
151
and side yokes L
132
a,
132
b,
side yokes R
152
a,
152
b
and center yokes
142
a,
142
b.
The yokes have, on front ends thereof, attraction surfaces
133
a;
133
b,
143
a;
143
b,
and
153
a;
153
b,
respectively. The attraction surfaces are magnetized by their respective permanent magnets, and one of the two parallel rows of attraction surfaces is magnetized as the N-pole and the other is magnetized as the S-pole. Thin copper plates
160
are inserted in between the attraction surfaces of the attraction regions
105
-
109
, to prevent the magnetic fluxes generated in the uncontrolled attraction regions from leaking to the adjacent attraction surfaces of the controlled attraction regions, so as to present the five attraction regions mentioned above in the form of independent magnetic circuits.
110
a,
110
b
denotes protectors.
The needle selection actuator
81
thus constructed operates as follows for needle selection. The armature
83
of the selector is displaced by the return cam mounted on the carriage
90
against the biasing force and is brought into abutment with the attraction surfaces
111
a,
111
b
of the needle selection actuator
81
. In the uncontrolled attraction regions, the magnetic flux flows from the attraction surface of the yoke on the N-pole side to the attraction surface of the yoke on the S-pole side through the selector to magnetically attract the selector to the attraction surface and hold it thereon. When the carriage
90
travels further in this state and the armature
83
of the selector is led to the position over the attraction surface
116
of the first needle selection part or the attraction surface
126
of the second needle selection part, the coil magnetic poles are energized for demagnetization, so as to release the selector from the attraction surface
116
,
126
.
The leakage of the magnetic flux from each of the attraction surfaces of the uncontrolled attraction regions
107
-
109
on S-pole side thereof varies depending on the number of selectors to be magnetically attracted to the attraction surfaces
133
,
143
,
153
. As the number of selectors to be magnetically attracted decreases, the leakage of the magnetic flux from the attraction surfaces
133
a,
143
a,
153
a
on the S-pole side increases. Increase in leakage of the magnetic flux will cause a part of the magnetic flux to flow to the attraction surface
116
a,
126
a
of the adjacent controlled attraction regions
105
,
106
beyond the copper plates
160
. Due to this, more electric current allowing for the leakage of the magnetic flux is r

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