Founded in 1995,Qingdao Haijia Machinery Group Co.,Ltd(hereinafter refered to as Haijia)has become a global leader in shuttleless looms.With sales in 30 countries,Haijia has sold over 170,000 shuttleless looms worldwi...Founded in 1995,Qingdao Haijia Machinery Group Co.,Ltd(hereinafter refered to as Haijia)has become a global leader in shuttleless looms.With sales in 30 countries,Haijia has sold over 170,000 shuttleless looms worldwide,and has maintained a leading market share in water-jet looms for many consecutive years.The Group boasts three manufacturing plants and over ten marketing and service centers worldwide,employs nearly 600 people,and holds over 170 proprietary intellectual property rights.Haijia is a comprehensive enterprise integrating R&D,design,manufacturing,marketing,and after-sales service.展开更多
BACKGROUND Although extensive research has investigated attentional biases based on the looming vulnerability model of anxiety,the characteristics of attentional biases in individuals with looming cognitive styles(LCS...BACKGROUND Although extensive research has investigated attentional biases based on the looming vulnerability model of anxiety,the characteristics of attentional biases in individuals with looming cognitive styles(LCS)remain incompletely elucidated.No prior eye-tracking studies have examined the spatiotemporal dynamics of their threat-related attentional preferences.AIM To investigate the nature and temporal pattern of attentional biases toward threat stimuli in individuals exhibiting different levels of LCS using eye-tracking technology.METHODS A total of 212 participants were stratified according to their Looming Maladaptive Style Questionnaire scores.From the high and low scoring subgroups,35 participants were randomly selected for an eye-tracking experiment using a classic dot-probe paradigm featuring threat and neutral images.Four eye-tracking metrics,including first fixation latency,first fixation duration,total fixation duration,and fixation count,were analyzed to assess detection speed,attentional orienting,initial maintenance/avoidance,and overall engagement.RESULTS Distinct attentional bias patterns were observed between high and low LCS groups.High LCS individuals exhibited a vigilance-avoidance pattern characterized by initial vigilance toward threat stimuli(evidenced by faster detection and preferential orienting),followed by attentional avoidance,alongside sustained attention maintenance to threat.CONCLUSION These findings reveal a temporal dissociation between early vigilance and later avoidance during threat processing in high LCS individuals,providing novel empirical evidence to refine models of cognitive vulnerability and attentional dynamics in threat perception.展开更多
On the basis of the analysis of typical orthogonal crankrocking lever spatial mechanism for the weft insertion in rapier looms, the rules of the outputting lever motion and the mechanism pressure-angle variety are stu...On the basis of the analysis of typical orthogonal crankrocking lever spatial mechanism for the weft insertion in rapier looms, the rules of the outputting lever motion and the mechanism pressure-angle variety are studied when the maximum swing angle of rocking lever and the length of outputting lever have different values, and the optimum parameters suitable for motion transmission can be chosen. At the same time some existing shortpoints of the mechanism are also pointed out.展开更多
A new type of rapier drive for flexible rapier loom through conjugate cams with five-bar linkage mechanism is raised and analyzed. Two designs suitable for the conversion of 1515-190.5 shuttle looms are given as examp...A new type of rapier drive for flexible rapier loom through conjugate cams with five-bar linkage mechanism is raised and analyzed. Two designs suitable for the conversion of 1515-190.5 shuttle looms are given as examples. This mechanism can be applied to traditional shuttle looms as well as to new flexible rapier loom design.展开更多
The airflow in the reed groove of the air jet loom for the weft insertion includes the jet stream from the relay nozzle, the back leak stream from the reed, and the diffusion stream from the open side. The air velocit...The airflow in the reed groove of the air jet loom for the weft insertion includes the jet stream from the relay nozzle, the back leak stream from the reed, and the diffusion stream from the open side. The air velocity in the reed groove can be measured to analyze the influence of process parameters during the weft insertion. The relation between the air velocity and the relay nozzle distance, the jet angle or the supply pressure of the relay nozzle can be studied. In this paper, the pitot tube is applied to measure the air velocity in reed groove by the instrument designed. And the results indicate that the air velocity fluctuation in the reed groove is strong, and can drop from 150 m·s-1 to 80 m·s-1 drastically.展开更多
A modified trapezoid acceleration pattern with a constant speed part is introduced for loomrapier motion driven by cam.The pattern can meet the time requirement of rapier on entering andleaving the shed,and can satisf...A modified trapezoid acceleration pattern with a constant speed part is introduced for loomrapier motion driven by cam.The pattern can meet the time requirement of rapier on entering andleaving the shed,and can satisfy the condition when the period duration of inserting is not equal tothat of withdrawing.Meanwhile,the pattern can also reduce the maximum acceleration of rapierand make the derivatives of rapier acceleration change continuously without any abruptness ofjerks.展开更多
In this paper,the effects of loom speed fluctuation on the mean speed and on the power ofdriving motor were investigated and the expressions for these effects were derived.Based on theenergy relationships,a new index ...In this paper,the effects of loom speed fluctuation on the mean speed and on the power ofdriving motor were investigated and the expressions for these effects were derived.Based on theenergy relationships,a new index of equivalent fluctuation was introduced,the connection be-tween this equivalent fluctuation and the energy of speed function on frequency domain was thenfound.In addition to the above theme,the residual kinetic energy of the shuttle and pickingmechanism,taken as a considerable part in the potentiality of loom energy-saving was also ana-lysed.According to the results of theoretical analyses,the ways of energy-saving in looms weresuggested.Finally,taking the loom of 1511 type as a practical example,the potentiality ofenergy-saving was calculated.展开更多
Based on the analysis, according to the principle of vibration, of the working character of weft tension compensator in needle looms, the paper studied the principle of tension compensation and introduced the idea of ...Based on the analysis, according to the principle of vibration, of the working character of weft tension compensator in needle looms, the paper studied the principle of tension compensation and introduced the idea of compensating coefficient. The paper also discussed some factors affecting the effect of tension compensation.展开更多
Based on the requirements of the two-phase rapier loom’s beat-up system characteristics, the dynamic responses of its beat-up system to three different types of cam input motion are studied in this paper. Also, their...Based on the requirements of the two-phase rapier loom’s beat-up system characteristics, the dynamic responses of its beat-up system to three different types of cam input motion are studied in this paper. Also, their corresponding analytical comparisons are made. At the end of the paper, the authors put forward a proposal of new type cam beat-up motion for future practice.展开更多
For a complicated high speed reciprocating machine to meet the requirements of precise motion of its mechanisms, a study of its kineto-elastodynamies is necessary. Here is an example to find out the cause of the misen...For a complicated high speed reciprocating machine to meet the requirements of precise motion of its mechanisms, a study of its kineto-elastodynamies is necessary. Here is an example to find out the cause of the misengagement of flexible rapiers, by means of kineto-elastodynamic analysis, so as to meet the requirements of flexible rapier loom′s design, with beat-up and weft insertion mechanisms operating at high speed.展开更多
The axle-treadle mechanism of Han loom consists of a set of components, including two pedals controlling one shaft via a central axle. Based on the new archaeological finds, especially the pottery loom model, the coll...The axle-treadle mechanism of Han loom consists of a set of components, including two pedals controlling one shaft via a central axle. Based on the new archaeological finds, especially the pottery loom model, the collection of Krishna Riboud, and the historical document, a kind of axle treadle loom with oblique warp frame was reconstructed by author. It might be applied in the central China at that time, especially in Shandong and Jiangsu areas, and it was not later than the Warring State period for the oblique axle treadle loom to come into being and reach a peak in the Han Dynasty. After that time, it was used with the vertical frame but lost the importance gradually.展开更多
In this paper, a review of the shuttleless looms’ development shows that three types of shuttleless looms: rapier, Jet and gripper projectile, are now equally matchable with each other. A prospect of the shuttleless ...In this paper, a review of the shuttleless looms’ development shows that three types of shuttleless looms: rapier, Jet and gripper projectile, are now equally matchable with each other. A prospect of the shuttleless loom’s development is also dealt with. It can be predicted that both rapier and Jet looms will be developed further and the future development of a new type of modern weaving looms will be prosperous in the coming 21st century.展开更多
文摘Founded in 1995,Qingdao Haijia Machinery Group Co.,Ltd(hereinafter refered to as Haijia)has become a global leader in shuttleless looms.With sales in 30 countries,Haijia has sold over 170,000 shuttleless looms worldwide,and has maintained a leading market share in water-jet looms for many consecutive years.The Group boasts three manufacturing plants and over ten marketing and service centers worldwide,employs nearly 600 people,and holds over 170 proprietary intellectual property rights.Haijia is a comprehensive enterprise integrating R&D,design,manufacturing,marketing,and after-sales service.
基金Supported by the Shanghai Municipal Health Commission,China,No.GWV-10.2-YQ46.
文摘BACKGROUND Although extensive research has investigated attentional biases based on the looming vulnerability model of anxiety,the characteristics of attentional biases in individuals with looming cognitive styles(LCS)remain incompletely elucidated.No prior eye-tracking studies have examined the spatiotemporal dynamics of their threat-related attentional preferences.AIM To investigate the nature and temporal pattern of attentional biases toward threat stimuli in individuals exhibiting different levels of LCS using eye-tracking technology.METHODS A total of 212 participants were stratified according to their Looming Maladaptive Style Questionnaire scores.From the high and low scoring subgroups,35 participants were randomly selected for an eye-tracking experiment using a classic dot-probe paradigm featuring threat and neutral images.Four eye-tracking metrics,including first fixation latency,first fixation duration,total fixation duration,and fixation count,were analyzed to assess detection speed,attentional orienting,initial maintenance/avoidance,and overall engagement.RESULTS Distinct attentional bias patterns were observed between high and low LCS groups.High LCS individuals exhibited a vigilance-avoidance pattern characterized by initial vigilance toward threat stimuli(evidenced by faster detection and preferential orienting),followed by attentional avoidance,alongside sustained attention maintenance to threat.CONCLUSION These findings reveal a temporal dissociation between early vigilance and later avoidance during threat processing in high LCS individuals,providing novel empirical evidence to refine models of cognitive vulnerability and attentional dynamics in threat perception.
文摘On the basis of the analysis of typical orthogonal crankrocking lever spatial mechanism for the weft insertion in rapier looms, the rules of the outputting lever motion and the mechanism pressure-angle variety are studied when the maximum swing angle of rocking lever and the length of outputting lever have different values, and the optimum parameters suitable for motion transmission can be chosen. At the same time some existing shortpoints of the mechanism are also pointed out.
文摘A new type of rapier drive for flexible rapier loom through conjugate cams with five-bar linkage mechanism is raised and analyzed. Two designs suitable for the conversion of 1515-190.5 shuttle looms are given as examples. This mechanism can be applied to traditional shuttle looms as well as to new flexible rapier loom design.
文摘The airflow in the reed groove of the air jet loom for the weft insertion includes the jet stream from the relay nozzle, the back leak stream from the reed, and the diffusion stream from the open side. The air velocity in the reed groove can be measured to analyze the influence of process parameters during the weft insertion. The relation between the air velocity and the relay nozzle distance, the jet angle or the supply pressure of the relay nozzle can be studied. In this paper, the pitot tube is applied to measure the air velocity in reed groove by the instrument designed. And the results indicate that the air velocity fluctuation in the reed groove is strong, and can drop from 150 m·s-1 to 80 m·s-1 drastically.
文摘A modified trapezoid acceleration pattern with a constant speed part is introduced for loomrapier motion driven by cam.The pattern can meet the time requirement of rapier on entering andleaving the shed,and can satisfy the condition when the period duration of inserting is not equal tothat of withdrawing.Meanwhile,the pattern can also reduce the maximum acceleration of rapierand make the derivatives of rapier acceleration change continuously without any abruptness ofjerks.
文摘In this paper,the effects of loom speed fluctuation on the mean speed and on the power ofdriving motor were investigated and the expressions for these effects were derived.Based on theenergy relationships,a new index of equivalent fluctuation was introduced,the connection be-tween this equivalent fluctuation and the energy of speed function on frequency domain was thenfound.In addition to the above theme,the residual kinetic energy of the shuttle and pickingmechanism,taken as a considerable part in the potentiality of loom energy-saving was also ana-lysed.According to the results of theoretical analyses,the ways of energy-saving in looms weresuggested.Finally,taking the loom of 1511 type as a practical example,the potentiality ofenergy-saving was calculated.
文摘Based on the analysis, according to the principle of vibration, of the working character of weft tension compensator in needle looms, the paper studied the principle of tension compensation and introduced the idea of compensating coefficient. The paper also discussed some factors affecting the effect of tension compensation.
文摘Based on the requirements of the two-phase rapier loom’s beat-up system characteristics, the dynamic responses of its beat-up system to three different types of cam input motion are studied in this paper. Also, their corresponding analytical comparisons are made. At the end of the paper, the authors put forward a proposal of new type cam beat-up motion for future practice.
文摘For a complicated high speed reciprocating machine to meet the requirements of precise motion of its mechanisms, a study of its kineto-elastodynamies is necessary. Here is an example to find out the cause of the misengagement of flexible rapiers, by means of kineto-elastodynamic analysis, so as to meet the requirements of flexible rapier loom′s design, with beat-up and weft insertion mechanisms operating at high speed.
文摘The axle-treadle mechanism of Han loom consists of a set of components, including two pedals controlling one shaft via a central axle. Based on the new archaeological finds, especially the pottery loom model, the collection of Krishna Riboud, and the historical document, a kind of axle treadle loom with oblique warp frame was reconstructed by author. It might be applied in the central China at that time, especially in Shandong and Jiangsu areas, and it was not later than the Warring State period for the oblique axle treadle loom to come into being and reach a peak in the Han Dynasty. After that time, it was used with the vertical frame but lost the importance gradually.
文摘In this paper, a review of the shuttleless looms’ development shows that three types of shuttleless looms: rapier, Jet and gripper projectile, are now equally matchable with each other. A prospect of the shuttleless loom’s development is also dealt with. It can be predicted that both rapier and Jet looms will be developed further and the future development of a new type of modern weaving looms will be prosperous in the coming 21st century.
