Six-bar feeding mechanism with pause function at the upper limit position
A technology of limit position and crank rocker mechanism, which is applied to sewing machine components, needle seats for sewing machines, textiles and papermaking, etc. It can solve the problems of non-existence, slow speed, long residence time of the needle bar, etc., and achieve large penetration, The effect of high speed and high kinetic energy
Inactive Publication Date: 2017-09-15
WUJIANG WANGONG ELECTROMECHANICAL EQUIP
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Problems solved by technology
Most of the threading mechanisms in the prior art are composed of a four-bar crank slider mechanism and a needle bar reciprocating system. The needle bar does not have the function of approximately stopping at the upper limit position, resulting in a long residence time of the needle bar in the working stroke area. The speed of completing the threading action is relatively slow
Method used
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[0031] The present invention will be described in detail below with reference to the accompanying drawings and in combination with embodiments.
[0032] The template sewing machine generally adopts the simplest upright crank slider mechanism. figure 1 A schematic diagram showing the principle of the upright slider crank stabbing mechanism, see figure 1 As shown, the upper shaft G rotates counterclockwise with the crank GH at an angular velocity ω, and drives the slider I (ie, the needle bar) through the connecting rod HI to make a reciprocating linear motion up and down.
[0033] Such as figure 1 The coordinate system AXY is adopted, and the center of rotation of the upper axis G is taken as the coordinate origin. In the picture I 2 Indicates the upper limit position of slider I, I 1 Indicates the lower limit position of slider I. When studying the kinematic coordination of the various mechanisms of the sewing machine, the lower limit position of the threading needle bar ...
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The invention discloses a six-rod pass-through mechanism with a pausing function at an upper extreme position, and is suitable for the modification of the conventional pass-through mechanism technology and the design of a new machine. According to the design principle, the connecting rod curve of a crank-rocker mechanism moves like a circular arc segment at a point on a connection rod; a group of dual-rod assembly and needle rod is connected to the point of the connecting rod; if the length of the dual-rod assembly is approximately equal to the radius value of the circular arc segment, the needle rod has an approximate pausing function at the upper extreme position. The needle pod approximately pauses at the upper extreme position in order that a pass-through action can be finished more rapidly in the working stroke area of the needle rod. The approximate pausing angle of the needle rod at the upper extreme position is long, the standing time in the working stroke area is shortened, the speed of the needle rod is increased in the working stroke area, the standing time of the needle rod in a sewing material is shortened, and the action of the needle rod for passing through the sewing material can be finished more rapidly. Meanwhile, under the consideration of the sewing performance, the kinetic energy of the needle rod is greater and the penetration force for penetrating the sewing material is greater when the sewing material penetration speed of the needle rod is higher.
Description
technical field [0001] The invention relates to a material threading mechanism applied to a template sewing machine, in particular to a six-bar material threading mechanism with a pause function at an upper limit position. Background technique [0002] The intelligent template sewing machine requires the needle bar to stay in the sewing material for a short time, and the feeding time for the feeding mechanism is long. According to the requirements of the sewing process, after the needle bar enters the sewing material, the feeding action must stop without feeding. Only when the needle bar exits the sewing material, the feeding mechanism can start feeding. The longer the needle bar stays in the sewing material, the shorter the feeding time for the feeding mechanism is. Therefore, the speed of the feeding mechanism must be increased, but the existing traditional template sewing machine uses two motors in the two feeding directions , The two motors start and stop repeatedly, an...
Claims
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IPC IPC(8): D05B55/14
CPCD05B55/14
Inventor 周平祝章琛
Owner WUJIANG WANGONG ELECTROMECHANICAL EQUIP