Threading apparatus and threading method in a textile machine

A yarn threading apparatus in a textile machine comprising:

• a main frame provided with twisting devices and heaters disposed downstream of said twisting devices;
• and
• a winding frame facing said main frame sandwiching an operator's aisle therebetween and provided with winding devices, whereby a yarn leaving the heater disposed on said main frame is guided beneath said operator's aisle to the winding device disposed on said winding frame,
• characterized in that
• said heater is provided with yarn threading slit extending along a yarn passage, and
• a guide member which is engageable with and disengageable from said yarn prior to being threaded into said heater is disposed adjacent to said yarn threading slit, whereby while the yarn is guided from said guide member to said winding device passing beneath said operator's aisle, said yarn is disengaged from said guide member and is threaded into said heater through said yarn threading slit.

A yarn threading apparatus in a textile machine comprising:

• a main frame provided with twisting devices and heaters disposed downstream of said twisting devices;
• and
• a winding frame facing said main frame sandwiching an operator's aisle therebetween and provided with winding devices, whereby a yarn leaving the heater disposed on said main frame is guided along said operator's aisle to the winding device disposed on said winding frame,
• characterized in that
• said heater is provided with a yarn threading slit extending along a yarn passage,
• a guide pipe member with a spiral cross section and provided with a yarn removing slit extending along the yarn passage is disposed adjacent to said yarn threading slit, and said member is engageable with and disengageable from said yarn prior to being threaded into said heater,
• a yarn guide pipe is disposed extendably and retractably along said operator's aisle,
• a yarn feed roller device is so disposed that it locates at the yarn feeding position when said yarn guide is retracted and that it moves to a stand-by position when said guide pipe is extended, and
• a yarn feed tube provided with a yarn feed nozzle is disposed between the extended end of said yarn guide pipe and said winding device.

A yarn threading apparatus in a textile machine comprising:

• a winding device and a threading device disposed in front of said winding device,
• characterized in that said threading device comprises:
• a yarn feed tube provided with a yarn feed nozzle;
• a guide member extending between a front end of said yarn feed tube and a position in front of said winding device;
• and
• a yarn guide bar locating between said guide member and said winding device and extending in a traversing direction of said winding device, and
• said guide member is provided with:
• a bottom surface which extends from said front end of said yarn feed tube and an end of which opposite to said yarn feed tube is smoothly curved toward said winding device over said guide bar;
• and
• side walls projecting from both sides of said bottom surface towards said winding device, wherein the height of said side walls of said guide member increases from said front end of said yarn feed tube to another end opposite to said yarn feed tube.

A yarn threading apparatus in a textile machine comprising:

• a main frame provided with twisting devices and heaters disposed downstream of said twisting devices;
• and
• a winding frame facing said main frame sandwiching an operator's aisle therebetween and provided with winding devices and threading devices disposed in front of said winding devices, whereby a yarn leaving the heater disposed on said main frame is guided along said operator's aisle to said winding device disposed on said winding frame,
• characterized in that
• said heater is provided with a yarn threading slit extending along a yarn passage,
• a guide pipe member with a spiral cross section and provided with a yarn removing slit extending along the yarn passage is disposed adjacent to said yarn threading slit, and said member is engageable with and disengageable from said yarn prior to being threaded into said heater,
• a yarn guide pipe is disposed extendably and retractably along said operator's aisle,
• a yarn feed roller device is so disposed that it locates at the yarn feeding position when said yarn guide pipe is retracted and that it moves to a stand-by position when said guide pipe is extended, and
• a yarn feed tube provided with a yarn feed nozzle is disposed between the extended end of said yarn guide pipe and said winding device, and
• said threading device comprises:
• a yarn feed pipe provided with a yarn feed nozzle;
• a guide member extending between a front end of said yarn feed tube and a position in front of said winding device;
• and
• a yarn guide bar locating between said guide member and said winding device and extending in a traversing direction of said winding device, and said guide member being provided with:
• a bottom surface which extends from said front end of said yarn feed tube and an end of which opposite to said yarn feed tube is smoothly curved toward said winding device over said guide bar;
• and
• side walls projecting from both sides of said bottom surface towards said winding device.

A yarn threading apparatus in a textile machine comprising:

• a main frame provided with twisting devices and yarn feed rollers disposed downstream of said twisting devices;
• and
• a winding frame facing said main frame sandwiching an operator's aisle therebetween and provided with winding devices, whereby a yarn travels beneath said operator's aisle,
• characterized in that
• said main frame has heaters mounted below said feed rollers, characterized in that the heater is provided with yarn threading slit extending along a yarn passage, and a guide member which is engageable with and disengageable from said yarn prior to being threaded into said heater is disposed adjacent to said yarn threading slit, and said guide member is provided with a slit through which said yarn is disengaged from said guide member so as to be threaded into said heater;
• and
• a guide pipe provided with a yarn feed nozzle is disposed along said operator's aisle, and a yarn feed tube provided with a yarn nozzle is disposed between an end of said guide pipe near the winding frame to the winding device, so that the yarn from said main frame is threaded onto the winding device.

A method for threading a yarn on a textile machine comprising:

• a main frame provided with twisting devices and heaters disposed downstream of said twisting devices;
• and
• a winding frame facing said main frame sandwiching an operator's aisle therebetween and provided with winding devices, whereby a yarn leaving the heater disposed on said main frame is guided along said operator's aisle to the winding device disposed on said winding frame, wherein
• said heater is provided with a yarn threading slit extending along a yarn passage,
• a guide pipe member having a spiral cross section and provided with a yarn removing slit extending along the yarn passage, which member is engageable with and disengageable from said yarn prior to being threaded into said heater is disposed adjacent to said yarn threading slit,
• a yarn guide pipe is disposed extendably and retractably along said operator's aisle,
• a yarn feed roller device is so disposed that it locates at the yarn feeding position when said yarn guide is retracted and that it moves to a stand-by position when said guide pipe is extended, and
• a yarn feed pipe provided with a yarn feed nozzle is disposed between the extended end of said yarn guide pipe and said winding device, characterized in that
• a yarn end is positioned at the entrance of said guide pipe member, and
• the yarn is guided by means of effect of said yarn feed nozzle from said guide pipe member to said winding device through said guide pipe,
• then, said yarn is disengaged from said guide pipe member through said yarn removing slit, and
• the thus disengaged yarn is threaded into said heater through said yarn threading slit.