FR2496719A1 - STEP SEARCH AND SLOW MARKET ON WEAVING MACHINE - Google Patents

Abstract

The invention relates to the textile industry and is concerned particularly with weaving machines. The device contains a geared motor, by which a comb mechanism, normally driven from the main motor of the loom via a belt pulley, can be driven by means of a selectively engageable coupling. A key/keyway system makes it possible selectively to couple the belt pulley to the main shaft or uncouple it from this. The geared motor can be used selectively for driving the cone mechanism solely for locating the correct shed or also for the slow-speed drive of the entire loom together with the comb mechanism. The invention avoids the disadvantages which a slow running of a loom drive caused by pulses entails.

Description

Pitch search and slow walking on a weaving machine.

 The invention relates to the textile industry and more particularly weaving.

On any weaving machine, when a pick breaks during insertion, the weft breaker stops the machine and the operator removes the broken thread before restarting. To access the broken pick, you must slowly rotate the weave mechanism back to uncross the chains and release the wire to be removed. In the event of the manufacture of a fancy fabric comprising threads of different colors and / or natures, these are inserted according to a determined program,
After reversing to release the broken pick, you must be able to operate the armor mechanics in forward to start again on the wire which, according to the program, must be thrown in the crowd.

 On the other hand, to make certain adjustments, it is desirable to operate the machine at reduced speed.

 Usually walking and slow walking are two separate functions. The first is carried out by separating the armor mechanics from the weaving machine and by slowly turning the first using a low-power motor-reducing unit and the second by supplying the main motor with pulses. weaving machine drive.

 This procedure, mainly with regard to operating the weaving machine in slow motion, is not at all satisfactory: it is extremely noisy, gives serious jolts to the whole machine and does not present exactly the characteristics of a continuous walk for the observation of a given phase of the weaving process.

 The object of the present invention is to remedy these drawbacks. It relates to a device controlling both the search for the pitch and the running at slow speed on a weaving machine, characterized in that a geared motor group can drive: - either the armor mechanics alone for the search for the pitch, - either the weaving machine and the weave mechanics for slow speed operation.

 The appended figures as well as the description which follows will better understand the advantage of the invention.

 Figure 1 shows a schematic overview of a device according to the invention.

 Figures 2 and 3 show two embodiments of part of the invention.

 Figure 4 is a section along AA of Figure 1.

 In Figure 1 is distinguished ue the main shaft 1 of a weaving machine which is supported in rotation relative to the frame 20 of the machine. It carries at one of its ends a longitudinal recess 2 in which slides a system of keys 3 urged by springs 4, the other end of which is attached to a stop 5 fixed on the shaft 1.

 On the shaft 1 is mounted a pulley 6 which can other secured or disengaged in rotation relative to the shaft 1 by means of the key system 3. In the preferred embodiment shown in Figure 1, the pulley 6 is composed of two concentric parts 6 'and 6 "mounted idly on the shaft 1. Part 6' is hollowed out of a housing 3 'to receive the keying 3. Part 6" is connected to part 6' by silent- block 19. When the keying system 3 enters its housing 3 ', it secures the part 6' of the pulley 6 with the shaft 1 which drives it in rotation and the movement is transmitted to the part 6 "by the silent- block 19, which gives a certain elasticity to the whole.

 The armor swell 7, the input shaft of which carries a pulley 10, is driven, from the shaft 1, by means of a belt which passes over the external part 6 "of the pulley 6 and on the pulley 10.

 The armor box 7 is also connected to a geared motor group, comprising a motor 11 and a reduction gear 12, for example by a chain 13 meshing on two chain wheels 14, 15. A clutch 16 makes it possible to secure or release the wheel 15 relative to the shaft 24 of the reducer.

The operation of the device is as follows
When the weaving machine works under normal conditions, the main shaft 1 of the machine is secured to the pulley 6 by means of the keying 3 which is normally held in place by its spring 4. The geared motor 11, 12 is isolated from using the clutch 16. The main engine (not shown, control ;; rìz jC both the machine and the armor mechanics 7.

 In the event of breakage of a pick during insertion, the machine is stopped by the weft breaker. The operator engages the motor 11 and starts it. At the same time an electromagnet 17 is supplied and it removes the key 3 from its housing 3 'in the part 6' of the pulley 6. The latter starts to rotate and the electromagnet is immediately de-energized. The released keys rub on a track of the pulley 6. The armor mechanics alone is controlled from the motor 11 by means of the reduction gear 12. When the pulley 6 has made a turn, the keying 3 enters its housing and a sensor 18 sensitive to the position of the key controls the cut-off of the power to the motor 11.The pulley 6 slows down, then stops The silent-blocks 19 provided in the pulley 6 to give a certain elasticity to the assembly facilitate the introduction of keying 3 in its housing 3 '.

 FIG. 2 represents a simple embodiment, in which the keying system only comprises a single key 3. This key enters its housing 3 'when the part N thereof arrives opposite point M of the key. But the pulley 6 rotating relatively quickly (of the order of 20 rpm), the impact of the key 3 against the walls of its housing can be sufficient to bring it out despite the thrust exerted by the spring 4.

In this case, the motor 11 does not stop because the stop command 18, sensitive to the position of the key 3, does not have time to play. -This commas can be for example a micro-contact, the lever 18 'of which must be brought into the position corresponding to the key 3 pressed into its housing to cut off the power supply to the motor 11.

 The embodiment shown in Figures 3 and 4 is more advantageous. In this case, the keying system 3 is double: two elements 3a, 3B, are contiguous and each is associated with its own spring 4. In the position shown, the key 3A is in place and the microswitch 18A has stopped the motor Il . The pulley 6 therefore rotates more slowly and the key 3B will be placed gently next to 3A when the bridge P of the housing has reached position Q.

 If the search for the pitch still requires a pulley revolution 6, the operator switches on the power to the motor 11 and the cycle begins again. The motor 11 can drive the pulley 6 in rotation in both directions in order to find in all cases the exact pick to be inserted in place of the one which has just been removed.

 In the case shown in FIGS. 2 and 3, where a keying system with two keys 3A and 3B is used, it is advantageous to associate a position detector individually, that is to say a microswitch 18A and 18B, with each of the keys 3A - 3B. The second microswitch can prevent the main motor from being switched on as long as the second key is not in place in its housing. On the other hand, as the pulley 6 can rotate in both directions, the first key which falls into its housing interrupts the supply of the motor 11.

 To control the weaving machine at low speed, the main motor is stopped and a safety locking device of any known model prohibits its re-energization, as long as the clutch 16 is engaged. The motor ll is supplied and the geared motor group 11, 12 engaged.

 It therefore drives both the armor mechanics 7 and the machine at a speed of the order of 20trXmn of continuous movement which eliminates all the disadvantages of operation by pulses.

Claims (5)

 1. Device controlling both the search for the pitch and the running at low speed on a weaving machine, comprising a geared motor group, a clutch capable of coupling the geared motor to the armor mechanics, a system of keying joining the main shaft of the weaving machine and the weave mechanics, characterized in that the geared motor 11, 12, is adapted to drive: -or the weave mechanics 7 alone for the search for the pitch, - Either the machine and the armor mechanics 7 for driving at low speed of said machine.  2. Device according to claim 1, characterized in that the connection of the main shaft of the weaving machine and of the weaving mechanics is carried out using a keying system with a double key movable in a recess of said main shaft and capable of entering a housing formed in a pulley 6 connected to the armor mechanism  3. Device according to claim 2, characterized in that the power of the gear motor is cut off, when the first part of the key has taken place in its housing, by a detector 18 of the position of the key.  4. Device according to claim 1, characterized in that a safety interlock prohibits energizing the main motor when the gear motor is engaged.  5. Device according to claim 2, characterized in that the keys are removed from their housing using an electromagnet.