Improved buttonholing machine tool

Abstract

The invention discloses an improved buttonholing machine tool. The improved buttonholing machine tool comprises a horizontally arranged rectangular feeding plate and a compaction feeding assembly which is positioned on the rear side of the rectangular feeding plate; a main compaction assembly and a buttonholing machine are parallelly arranged on the rear side of the compaction feeding assembly left and right; a machine head compaction assembly is distributed on the rear side of the head of the buttonholing machine; the compaction feeding assembly comprises upper compaction pins and a lower material supporting plate which are arranged vertically; the upper compaction pins and the lower material supporting plate can be opened or closed; the main compaction assembly and the machine head compaction assembly comprise a plurality of pairs of upper and lower compaction pins which are arranged along the length direction at intervals respectively; and the upper compaction pins and the lower compaction pins can be opened or closed; and the upper compaction pins of three sets of compaction positioning assemblies are driven by an air cylinder to vertically lift. A clamping positioning structure which is vertically pressed improves straightness of a button hole of a front fly of shirts, and guarantees the aesthetic feeling of the front fly of shirts; the mechanical structure is greatly simplified, the assembly difficulty and debugging difficulty are reduced, and the mechanical assembly efficiency and the maintenance cost of a customer are improved conveniently; and the buttonholing machine tool guarantees that the stress surface is full when fabric is compacted and has a better compaction effect.

Description

technical field [0001] The invention relates to a buttonhole machine tool for shirt placket buttonholes, in particular to the clamping and positioning of cloth. Background technique [0002] At present, the existing automatic high-speed buttonhole machine tools produced by Japan Heavy Machinery Co., Ltd. are widely used and have relatively good performance. The machine tool has three sets of pressing and feeding components: the main pressing unit, the head pressing unit, and the pressing and feeding unit. These three sets of components all adopt the idea of ​​rotating and pressing: [0003] The pressing and feeding assembly includes upper and lower arrangement, openable / closable upper pressing foot and lower support plate, the main pressing assembly and machine head pressing assembly include multiple opening / closing For the upper and lower pressing feet, the opening / closing of the three sets of components is realized by turning over the upper pressing foot. When closed, t...

AI Technical Summary

Problems solved by technology

[0005] One is that the spinning clamping structure has its own structural characteristics. When the upper clamping foot is turned over, a shearing force tangential to the rotation direction of the pressing foot will be generated on the fabric, and the fabric will be subjected to a vertical downward force. In addition to the pressure component force, there is also a horizontal component force, the cloth will be displaced under this force component, and the positioning that should be accurate becomes no longer accurate; the keyhole machine tool originally relies on three sets of components to press the cloth for positioning. However, due to the downward shearing force caused by the rotary downward pressure method used in the component structure, the fabric that needs to be precisely positioned is more or less displaced

The displacement caused by the three shearing forces at the same time will cause serious deviation of the cloth, so that the straightness of the buttonhole of the machine cannot be effectively guaranteed when the buttonhole is buttonholed

At present, customers have put forward very high requirements on the straightness of the buttonhole machine, and some customers have even proposed that the straightness should be kept within 0.25mm, and the requirements will become higher and higher in the future. Obviously, the existing buttonhole machine tools Straightness is difficult to achieve;

[0006] The second is that the rotating and pressing method has relatively high requirements on the angular accuracy of the rotating parts, and the structure of the rotating parts is also very complicated. The debugging of the upper and lower pressing feet is also extremely cumbersome, and the assembly is very difficult. High, and greatly strengthened the work intensity of the assembly workers, which seriously affected the assembly efficiency of the machine. When the customer needs to adjust, the adjustment is very difficult, and the adjustment result is not easy to achieve good results, which affects the customer's use of the machine. efficiency;

[0007] The third is that the upper pressing foot is in a tilted state when pressing the fabric, and the contact with the lower supporting plate and the lower pressing foot in a horizontal state below it is a line contact, and the cloth is subjected to a pressing force on a pressing line. There is no force-bearing surface, and the compression effect is not ideal

When the fabric is subjected to external force, such as when the buttonhole machine head is working on the buttonhole, the positioning is prone to not being firm, and it will also affect the straightness and aesthetics of the buttonhole

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