Abstract: The birthday calendar is a dual monthly calendar and twelve-month chart. The calendar is perpetual in that it is not designated for any particular year or month. The monthly calendar is made of a dry-erase board displaying a month grid that is filled in with erasable ink for any particular month. The chart is a grid used to permanently record and display birth dates and other annual dates such as anniversaries and holidays. The chart displays columns intersected by rows. The columns are grouped in twelve sets of two having a month column adjacent to a year column. The rows display the dates of each month down the left side of the chart, numbered from 1–31. An event is recorded in the chart by writing the event's name in the appropriate month and date space and the year in the adjacent year space.

Abstract: The birthday calendar is a dual monthly calendar and twelve-month chart. The calendar is perpetual in that it is not designated for any particular time period. The monthly calendar displays a month, either from a single use calendar or by filling in a month grid disposed on a dry-erase board with erasable ink. The chart is a grid used to permanently record and display birth dates and other annual dates such as anniversaries and holidays. The chart displays columns intersected by rows. The columns are grouped in twelve sets of two having a month column adjacent to a year column. The rows display the dates of each month down the left side of the chart, numbered from 1–31. An event is recorded in the chart by writing the event's name in the appropriate month and date space and the year in the adjacent year space.

Abstract: A method and apparatus for wavelength switching a laser source. An external cavity (2) having a Bragg grating (5) is provided in an optical fiber (4). Space division switching is performed in the external cavity between a plurality of optical fibers (4) each having a different Bragg grating (5). A space division switch (3) is provided in the external cavity for switching between a plurality of optical fibers (4) each carrying a different Bragg grating (5).

Abstract: The invention concerns a textile machine operating on fiber band with a feeding device for the fiber band and a guide element for the fiber band and further provided with a band monitor for the discovery of band breakage. The band monitor (BW, BW1, BW2, BW3) is placed always in the area of the guide element, in particular one band guide (BF) and another band guide element (FE, FE1, FE2, FE3) in the area of the band monitor (BW, BW1, BW2, BW3). The running time behavior of the fiber band (FB) is directly improved by the guide element (FE, FE1, FE2, FE3), that is, the vibrations of the fiber band (FB) are damped. This will avoid a situation wherein false alarm signals are given because of an originally vibrating fiber band at the band monitor.

Abstract: A method for improving the monitoring of the fill state of a sliver can (5) at a spinning station of a textile machine processing sliver wherein a defined portion (24 or 124) of a can bottom (22) is initially kept free from sliver (6) while a predetermined amount of sliver (6) is deposited on an adjoining portion (25 or 125) of the can bottom (22) and only after the adjoining portion (25 or 125) is covered with sliver, is the defined portion (24 or 124) covered with sliver (6). The method includes monitoring the defined (24 or 124) portion while the sliver is being drawn out and detecting when the defined portion of the can bottom (22) is uncovered to trigger a signal for exchanging an empty can for a filled sliver can. In one preferred embodiment, a sensor (27) for monitoring the defined portion (24 or 124) and detecting an uncovered can bottom is mounted on a service unit (16) which passes over the spinning stations.

Abstract: A process for controlling the operation of a textile draw frame wherein a plurality of fiber slivers are fed to the draw frame at a predetermined desired delivery speed includes monitoring the presence of individual fiber slivers delivered to the draw frame and decreasing the delivery speed of the draw frame if any of the monitored fiber slivers is indicated as missing from being fed to the draw frame. The process includes subsequently increasing the delivery speed of the draw frame if the respective missing fiber slivers are again indicated as being fed to the draw frame. The invention also includes a draw frame including apparatus for carrying out the controlling process.

Abstract: A device is provided for the detection of breakage of textile fiber slivers before a draw frame of the textile industry. The device must detect breakage of presented fiber slivers. The invention improves the reliability of detection of sliver breakage of presented textile fiber slivers at very high sliver intake speeds of a draw frame. It is a characteristic of the invention that the monitoring device is provided with a deflection device for the fiber slivers which ensures that any broken fiber slivers are detected by the monitoring device.

Abstract: Lengthwise stretching machines for thermoplastic synthetic films are equipped with mechanical or opto-electrical devices for detecting a tearing of the film or an accumulation of film on the stretching rollers and for stopping the machine when tearing or accumulation occurs, to protect the stretching rollers. Unallowable loads and possible damage to the roller bearings are avoided by mounting the bearing housings (1, 2) of each roller (3, 4, 5) of a lower roller (7) in the machine frame for cooperation with a force generating device (8) which presses the respective bearing housing (1, 2) toward oppositely located rollers (9, 10, 11) of an upper roller group (12) to an extent permitted by stops (14, 15) rigidly arranged on the machine frame (13). The rollers (3, 4, 5) of the lower group received in the bearing housing (1, 2) can overcome the pressing force of the device (8) to slide in a yielding direction away from the upper rollers, when a roller accumulates film thereon.

Abstract: An automatic device for positioning a mechanical yarn feeler against a yarn. An extendable arm is provided with a magnet at one end. The magnet is held in a pivotable base which pivots within a limited range on the arm. The magnet actively engages the feeler when the arm is extended and as the arm retracts to lower the feeler onto the yarn, the magnet rotates with respect to the arm. When the magnet rotation reaches its limit, the magnet disengages the feeler and the feeler becomes passively supported on the base. The feeler is then further lowered to rest against the yarn and the arm retracted out of engagement with the feeler.

Abstract: A catcher device with a clamp is fitted about the outer surface of a fiber sliver can. The can may rotate on its longitudinal axis whereby an end of a fiber sliver is also moved in the direction of the catcher device. Through the rotation of the can, the fiber sliver is laid in the clamp and drawn through it until the desired length of the sliver end is reached. At this moment, the clamp is closed and the sliver end is clamped in the catcher device. The clamp comprises two clamping elements, which are actuated through a cam plate with trigger cams. The control is effected by sensors and a driving motor.

Abstract: An apparatus for sensing a parting in any of the strands of sliver fed from a creel to the drafting rolls of a high speed textile draw frame to stop the drawing process in response to a sliver parting. A plurality of sliver guides are mounted on an elongate arm which is compact and readily mounted on the creel. The sliver guides are U-shaped with inturned upper end portions defining a restricted opening at the top portion and a capacitive sensing switch positioned in the bight portion thereof. The sliver guides also include a low coefficient of friction coating to reduce the accumulation of lint. Cylindrical post separators are positioned alongside the path of the slivers to maintain separation and prevent entangling of adjacent slivers. Logic and control electronics are contained within a housing carried by the elongate arm.

Abstract: The invention relates to a feed table for feeding slivers by way of a conveyor to a textile processing machine. The slivers are drawn off from associated spinning cans by way of draw-off devices and placed on the conveyor. In the event of a sliver running out or breaking, reserve slivers are fed in automatically by way of draw-off devices specifically devised for this purpose. The conveyor comprises individual conveyor belts associated with each sliver and each reserve sliver and have a draw-off devices, each conveyor belt being drivable by way of a controllable drive, the conveyor belts being a part of the draw-off devices.

Abstract: The textile machine, for example a spinning machine, comprising at least one drawing system consisting of a plurality of runs, such as pairs of rollers and the like. At least two such runs each have a cylinder having markings which are detected by a sensor of a separate pulse generator. The output signal S.sub.1 of one pulse generator is applied to a count input of a counter while the output signal S.sub.2 of the other pulse generator is applied to a reset input of the counter. The counter can be reset by the output signal S.sub.2 only during a preset reset time window. When the counter has counted to the end of this time window, the counter furnishes a trigger signal S.sub.3 for an alarm and the like.

Abstract: A first sliver in an exhaust can (2F) is introduced and held in a recess (38a) of a sliver piecing unit (38) while gripped by a sliver gripper (34). The first sliver is severed by the displacement of the gripper (34) away from the recess (38a) so that a trailing end of the first sliver is formed in the recess (38a). Next, a second sliver in a reserve can (2B) is introduced and held in the recess (38a) in the same way as for the first sliver and a leading end of thereof is formed in the recess (38a) so that the sliver ends overlap each other. The piecing operation is carried out on the overlapped sliver ends in a known manner.

Abstract: In the case of a spinning machine having a plurality of spinning units which are arranged next to one another and to each of which a sliver is fed from a container, a movable servicing device is provided which contains devices for the picking-up of the starting portion of a new sliver from a readied container and for the connecting of this sliver with the end portion of the old sliver entering into the respective spinning unit.

Abstract: Apparatus and method for detecting sliver feed or standstill uses comparative measurements over a time-lapse to determine sliver movement. An identical reading in two or more sequential measurements indicates the sliver is not being conveyed, that is, it is either lying motionless or is absent altogether. Signals relating to the sensed standstill may be further processed in the machine control. The sensors are measuring elements capable of detecting thickness of the sliver and may be mechanical, optical or the like.

Abstract: In the event of a yarn breakage the pressing roll of the inlet roll pair of a drafting arrangement is raised by a slubbing guide element from the inlet drafting roll or cylinder while simultaneously forming a clamping location for the slubbing or other fiber material.

Abstract: A stop motion apparatus for a drafting device for roving in a textile machine includes a stop member into roving stopping engagement with the intake feed rollers of the drafting device by operation of an actuating rod. The actuating rod includes a notch having an undercut surface for engagement by a plunger element. Preferably, the undercut surface is transversely arcuate and the plunger element includes a plastic sleeve element compatibly configured with the actuating rod notch. the plunger element is selectively insertable into, and retractable from, the notch of the operating rod by an electromagentic assembly operatively connected to a yarn break monitor. The stop motion apparatus includes a shaft having a forked end for manually clearing the plunger element from the actuating rod notch.

Abstract: According to the method, an end part of a roving is first introduced into the main drafting zone of a drafting frame of a textile machine after a reference point at a clamping device. Thereafter, a middle part of the roving is drawn laterally into the preliminary drafting zone solely by the tension of the main drafting zone. The apparatus comprises a gripper which is connected via a pivotable arm or a telescopic arm to a mobile or stationary robot which can cooperate either with a pusher, a spacer or a fixed slider.

Abstract: The slubbing stopping device comprises a movable part having a magnet and a fixed part having a magnet. One of these magnets is an electromagnet and the other a permanent magnet. The movable and fixed parts can assume an operating position in readiness for clamping the elongate or rope-like fiber material which may be constituted by a silver, roving or slubbing or the like. These movable and fixed parts, when in the operating position, are connected by the magnetic field of the permanent magnet. An electrical energy supply delivers electrical energy to the electromagnet so that the movable and fixed parts can be separated from one another and the movable part assumes a slubbing clamping position. The electrical energy supply powers the electromagnet such that the permanent magnet and the electromagnet, which previously adhered to one another by magnetic attraction, are repelled so as to separate the permanent magnet and electromagnet from one another.

Abstract: In an arrangement for interrupting the operation of an individual drafting frame at a spinning machine, devices are provided for reducing the contact of a sliver with the bottom rollers and particularly for lifting the sliver off the bottom rollers which are operative when the pressure rollers are lifted off the bottom rollers.

Abstract: An apparatus for supporting a stop member of a stop motion device of a textile ring spinning machine is provided. The apparatus includes a carriage having a cam portion for removably receiving and manipulating the projecting cam follower portion of the stop member, a device for reciprocating the carriage and a device for releasably positioning the carriage on the reciprocating device in a predetermined position. The carriage is disengagable from the positioning device for movement therefrom sufficiently to permit removal and replacement of the stop member from the carriage and is reengagable with the positioning device for positioning the carriage in its predetermined position. Preferably, the carriage and the positioning device each includes cooperatively configured portions for releasable interengagement with one another to position the carriage in its predetermined position.

Abstract: A device used to feed fiber slivers to a processing machine with at least one sliver guide. The sliver guide is provided with a guiding surface over which the fiber sliver is guided. The guiding surface also serves as a sliver monitoring device.The sliver guide is produced in a process in which the housing of the sliver guide, standing on its head, together with its guiding surface, is clamped over a die. A sensor is inserted into the housing from the side opposite the guiding surface and is embedded therein in a casting compound.

Abstract: An improvement in a roving stop motion for a spinning machine of the type having a series of pairs of drafting rollers, the stop motion including a clamping member mounted on a lever arm drivenly connected to an actuating rod by a carriage which is selectively mountable at differing locations along the actuating rod. The actuating rod is responsive to roving breakage to drive the lever arm to cause the clamping member to separate the feed rollers from one another and press the roving against one roller. The positionability of the carriage enables the lever arm to be properly disposed with respect to the feed rollers when the spacing between the roller pairs is varied.

Abstract: Roving or sliver clamping device at the drafting unit of a spinning machine, with a clamp segment which enters in the operative position between the upper inlet roller and the lower inlet roller of the drafting unit, and which clamp segment raises the upper inlet roller from the lower inlet roller, and clamps the roving or sliver against the upper inlet roller, whereby the clamp segment is acted upon by an actuating element which causes its roving or sliver-clamping position, and the clamp segment is maintained in the position in which the roving or sliver clamping device is at rest by a holding element. The holding element includes means for storing energy and it positively counteracts the actuating element.

Abstract: A spinning machine is provided with a thread monitoring device having a light source and a light sensitive cell to sense the thread running to a spindle from the front exit rollers. The thread monitor is formed of two parts, each having a housing arranged on either side of the thread. Within each housing is the light source and the light sensitive cell. The housings are each detachably connected to a slider which is adjustably held in a guide support that can be swivelled and locked in a carrier which is secured to the free end of a support rail running alongside and parallel to the roller supporting arm.

Abstract: Spinning machine in which the upper rollers of the drafting units are arranged at pressure arm assemblies, whereby each pressure arm assembly has a main arm and an operating lever which is positionally arranged above the main arm and radially movable. To each work location of the machine are assigned signal lights for indicating disruptions at the work location. For optimum visibility from distant locations, the indicator lights are provided at the operating levers.

Abstract: A draw frame for a spinning machine is provided with roving blocking mechanism associated with its inlet rollers actuable on rupture of the remittant thread to arrest movement of the roving and is further provided with a sensor for detecting the continuity of the roving being fed from a source of supply and a roving clamp situated between the sensor and the blocking mechanism. The blocking mechanism and the roving clamp are arranged to be simultaneously operated in response to a signal from the sensor or in response to rupture of the thread.

Abstract: A drafting roller arrangement for spinning machines is disclosed having at least three pairs of rollers forming successive drafting zones in the conveying direction of the sliver and having a sliver stopping device assigned to the first pair of rollers that can be triggered by a disturbance. In front of the last drafting zone, a sliver condenser having guide surfaces narrowingly tapering in the conveying direction of the sliver is arranged. The sliver condenser is provided with a threading slot extending in the conveying direction of the sliver and is held by means of a holding device in such a way that it can be moved out of the drafting zone transversely to the conveying direction toward the side facing away from the threading slot. This arrangement accommodates restarting of the drafting arrangement without the sliver condenser interfering with the sliver supplied to the last drafting zone.

Abstract: A device for interrupting feed of a roving on a drawing frame, having a feed roller pair, e.g., a powered bottom roller and a top roller tensioned against the bottom roller by springs, includes a clamp for lifting the top roller away from the bottom roller and clamping the roving against the circumference of the top roller. The clamp is disposed on a lever pivotable about an axis parallel to the axes of the feed roller pair and is shiftable with respect to a clamping edge, in the feed direction of the roving, toward the circumference of the top roller. The clamp includes a tongue which initially engages in the nip between the rollers and a portion having a toothed profile which cooperates with the clamping edge by engaging the roving.

Abstract: A draw frame for spinning machine is provided with a blocking mechanism movable into a position between the upper and lower feed rollers in the event of yarn breakage, to lift the roving from contact with the driven rollers. The blocking member is mounted on a rail, extending parallel to a load arm on which the upper rollers are mounted. Both load arm and the bearing arm rail are swivelably mounted. Each of the bearing rails are arranged so that they are weighted by the supporting arm, when placed in the operating position, by a resilient member acting on a connecting member between the bearing rails.

Abstract: A drawing frame for a spinning machine is provided with a blocking mechanism movable into a position between the upper and the lower feed rollers in the event of yarn breakage, to lift the roving from contact with the driven roller. A roving holder facilitating the holding of the tuft end of the roving between the drawing and outlet rollers is provided. This latter apparatus is coupled to the means for actuating the blocking mechanism for synchronous operation and is provided downstream of the inlet roller. It comprises a table extending beneath the roving and a rotatable shaped arm above the roving which arm is movable by the switching mechanism to simultaneously hold the front end of the roving.

Abstract: A drawing frame for a spinning machine is provided with a blocking mechanism movable into a position between the upper and the lower feed rollers, in the event of yarn breakage, to lift the roving from contact with the driven roller. The blocking mechanism holds the roving. A roving holder is coupled to the means for actuating the blocking mechanism for synchronous operation and is provided downstream of the inlet roller. It comprises a table extending beneath the roving and a rotatable shaped arm above the roving which arm is movable by the switching mechanism to simultaneously hold the front end of the roving. The table is provided with a guide lug at its free end extending at an upward angle relative to the rotatable arm and the arm is covered with an inclined member having a slope running toward the guide lug.

Abstract: A bearing rail is provided extending along each side of the draw frame and spaced laterally from the outer edges of the double upper rollers. At the end of the each rail, in the area when the thread exits from the exit rollers, each rail is provided with two carriers, one of which is provided with a light source and the other which with a light receiving photo-cell. The light source on one side of the drawing frame is arranged in association with the thread being drawn adjacent the photo-cell on the other side so that the light source causes this remote thread to cast a shadow on the photo-cell adjacent to it. Similarly the light source on the other side, the thread remote from it and the photo-cell opposite it are also aligned. The shadow on each photo-cell produces an alternating current which is then independently fed to a circuit and switch means, housed at the inlet end of the bearing rail.

Abstract: A device is provided for interrupting the feed of a roving to drawing frames on ring spinning machines in response to thread breakage at a respective spinning unit. The device includes a clamping segment annularly clamped about a lower drawing roll and having abuttments for selectively lifting the upper drawing roll away from the lower roll to interrupt the feed of roving in response to movement of the clamping segment to an interrupting position. To control the clamping segment, a locking detent lever is provided which is spring-loaded into a locking position engaging the clamping segment and movable to an unlocking position in response to an electrical drive mechanism which, in turn, is controlled by a thread end break detection device. In particularly preferred embodiments, a capacitor is used to energize the drive means to unlock the lever, the capacitor being charged during normal spinning operation and discharged for a preset time period during the unlocking operation.

Abstract: Disclosed is a process and apparatus for stopping the drawing action of a draw frame whenever sliver breaks. The sliver is pneumatically conveyed into the field of influence of a sensor which generates a signal indicating the presence of the broken sliver therein. This signal is used to stop the draw frame, thus eliminating the production of sub-weight sliver or roving.

Abstract: In textile machines fed with fibre slivers, such as e.g. drawframes, immediate stopping of the machine is required in case of a sliver breakage before or on the feed table. This requirement is fulfilled using the inventive stop motion apparatus quickly and reliably, by tilting a pan arranged beneath each normally running fibre sliver and which does not contact such fibre sliver. The reaction time of the stop motion apparatus can be shortened by providing a heavy body on, and movable with respect to, the pan, the body being e.g. in the form of a steel ball. Since the pan in its working position does not contact the normally running fibre sliver, slivers of improved quality are produced and contamination of the stop motion apparatus is avoided.

Abstract: An ends-down sensor device for detecting breakage or absence of a cabinet end of filamentary yarn, involving a cylindrical roller seated upon a fixed center post with the center of gravity of the roller causing it to rotate relative to the center post in one direction and activate a suitable signal device when a cabinet end breaks or becomes missing; and upon a cabinet end frictionally engaging the cylindrical roller, causing the roller to rotate relative to the center post in the opposite direction and deactivate the signal device.

Abstract: An order produced by an interruption of yarn delivery at the exit of a spinning unit is cancelled so that the yarn-piecing automaton does not stop in front of the unit but continues to travel towards another spinning unit. At the same time, an alarm system is automatically triggered in order to warn operating personnel that a servicing operation is urgently required.

Abstract: A device for withdrawing and gathering a fiber web discharged by a web delivering assembly of a carding machine includes a guide element arranged immediately downstream of the web delivering assembly and has a web guiding face; a support for positioning the guiding face to be movable towards and away from the web delivering assembly; an arrangement for urging the guiding face towards the web delivering assembly into a closed position with a predetermined force; a switch supported adjacent the guiding face for actuation by the guiding face upon movement of the guiding face away from the web delivering assembly in response to a web pressure opposing and exceeding the predetermined force; and an arrangement connected to the switch and responsive to the actuation thereof.

Abstract: A combined damper and thread breakage sensor for use with textile machines includes a housing having a non-conducting medium disposed therein and a first contact and a second contact means immersed in the medium. The second contact extends beyond the housing and is provided with means for guiding the thread in a first position. Upon breakage of the thread the second contact moves to a second position coming into electrical contact with the first contact thereby completing an electrical circuit path of an external circuit. The completed electrical circuit path causes the circuit to shut down the textile machine, thus preventing the fabrication of defective material. The movable contact is provided with a portion which offers resistance to the non-conducting medium thereby additionally functioning to dampen out any sudden and intermittent changes in the thread tension.

Abstract: A stop motion apparatus is disclosed for disengaging a drive motion on a carding machine in response to the detection of a desired operating condition wherein the carding machine is of the type having motorized drive means for imparting a drive motion to the carding machine when engaged and actuator means for selectively enaging or disengaging the drive motion. The stop motion apparatus includes a base for attachment to the carding machine and a pivotable arm assembly carried by the base. A linkage assembly connects the pivotable arm assembly to the actuator means of the carding machine. The pivotable arm assembly has a first position in which the actuator means disengages the drive stopping the carding machine and a second position in which the actuator means engages the card drive.

Abstract: In monitoring a continuous sequence of work positions on a textile machine for thread breakage, a magnetic probe is driven along a path adjacent the ring traveler at each work position so as to generate a signal upon detection of the traveler as it rotates with the thread and provide no signal when the traveler ceases to rotate due to thread breakage. To simplify the electrical connection to the probe, the drive arrangement for the probe includes at least one conductive metallic drive band connected to the probe and to a driving source for moving the probe along the path past the work positions. A detector is then coupled to the drive band to detect the electrical signals carried thereby from the probe.

Abstract: The apparatus is particularly adapted for detecting breakage, run-out or excessive slackening of running sliver strands passing from a creel to the drafting rolls of a textile drafting machine, and includes reed switches which are actuable by movement, into proximity therewith, of magnet-carrying members which normally are maintained distal from the switches by engagement with the sliver strands. The reed switches are protectively mounted and are so located with respect to the magnet-carrying members as to minimize the number of reed switches required for operation of the apparatus. The channelled mounting for the reed switches also provides separating vane guides for the adjacent running strands of sliver, the guide walls having rounded end protuberances to effect better separation; both the guide elements and magnet-carrying members being coated with a smooth plastic to obviate snagging of sliver.

Abstract: In a textile machine of the kind which processes a material in the form of a web or a gauze, a circuit for checking the continuity of said web or gauze, said circuit being branched off from the circuit which feeds the machine proper and ending in two terminals between which the web or gauze is caused to run, so that, when no web or gauze is interposed between said terminals, the branched off circuit is closed and electromagnetic means enter action to stop the machine.

Abstract: A pivoted stop motion particularly adapted for each of a plurality of ends of sliver or the like is operatively associated with a rotatable guide for sliver having little tensile strength to stop the drawing frame if an end of sliver breaks or becomes slack. An electrically charged contact rod extends over a row of pivoted sensors perpendicularly to the path of the sliver, the several ends of which are separated from each other by discs fixed to a rotatable shaft. Breakage of an end of sliver causes its corresponding sensor to engage the contact rod to stop the machine.

Abstract: Apparatus for surveying the condition of roving is mounted on an automatic yarn knotting device movable along a spindle row in a textile machine having a drafting device for roving allocated to each spindle. When a roving breakage is indicated, the knotting device stops at the appropriate position and a first detecting device on a pivoted lever is moved to a position in which it checks the presence of roving passing through the drafting device. If there is no roving due to exhaustion of supply, no knotting is effected, but if roving is present the knotting device is prepared and a second lever moves a second detecting device to two output rollers for delivery of roving from the drafting device. If this second device detects no wrapping of roving on one of the two output rollers, the knotting process is initiated.

Abstract: A variable speed drive system for a carding machine employs a variable pitch pulley assembly that rotates the feed cylinder and doffer cylinder at a constant slow speed as the sliver is made up to the coiler can, and after a predetermined time lapse the speed of the feed cylinder and doffer automatically and progressively increase at a fixed speed ratio from the slow speed condition to a constant high speed condition. If the sliver is not made up properly within the time lapse, the operation of the feed cylinder and doffer cylinder is automatically terminated.

Abstract: This invention relates to an apparatus for interrupting the rotary movement of a drive roller for feeding a textile web and comprises a pivoted lever having a frame at one end with an opening through which passes the web driven by the roller. Positioned beneath the opening in the frame is a ring nozzle supplied with liquid under pressure to advance the web passing through the opening in the frame through a guide tube associated with the nozzle. A magnetic switch is provided in circuit with the drive means for the roller to effect stoppage of the rotation of the roller when the switch is actuated, a linkage being connected between the lever and the switch to actuate the latter when the lever is pivoted.