CN210824600U - Automatic supply device is accomodate to label scroll - Google Patents

Abstract

An automatic label paper roll accommodating and supplying device comprises a lithium storage battery, a charging socket, a power switch, a shell, a paper rolling mechanism and a control circuit; each paper winding mechanism comprises a shell, a motor speed reducing mechanism and a winding drum, wherein a magnet is arranged at the lower end of the shell; two sets of motor reducing mechanisms are respectively arranged at the front part of the upper end of one side of the shell, one end of a connecting shaft in the middle of the two winding drums is respectively sleeved in the inner rings of the two bearing seats, and the power output shafts of the two sets of motor reducing mechanisms and the other ends of the two connecting shafts are respectively arranged together; each roll of label paper is placed inside each shell; the permanent magnets at the lower part of the shell of the paper winding mechanism are attracted to the lower part in the shell; the multiple sets of control circuit photoelectric switches are respectively arranged in the multiple openings at the upper part of the front end of the shell; the relay, the lithium storage battery, the charging socket and the power switch of the control circuit are arranged in the element box and are connected through the wires. In the novel use, the label paper can not be scattered and rolled up, is more convenient to store, and the label paper is pulled out without manual operation.

Description

Automatic supply device is accomodate to label scroll

Technical Field

The utility model relates to a label scroll corollary equipment field, especially an automatic supply arrangement is accomodate to label scroll.

Background

Label paper is widely used for labeling articles. The label roll is formed by winding a length of label paper together. The existing label paper roll is generally surrounded on the outer side of a cylindrical plastic cylinder, when in use, a section of label is pulled out, then a section of label paper is torn to adhere a self-adhesive label printed with characters and patterns on a wax layer of the label paper or the self-adhesive label without any printing body on the surface of an article to be calibrated through a non-adhesive layer on the lower part of the label paper (for example, the label paper used in hospitals is used for calibrating names of patients corresponding to test tubes). Because the label scroll is around behind the plastic drum outside, can't effectively fix the outmost label scroll of plastic drum, consequently be in outmost label paper and scatter easily, the label scroll is around when the barrel outside is not tight, still leads to the volume of loosing easily, and inconvenient accomodating, if the on-the-spot needs to use the multiple label scroll that has different printing bodies, so putting of a plurality of label scroll is more inconvenient, more inconvenient accomodating together, leads to the on-the-spot in disorder. Based on the above, it is particularly necessary to provide a label paper roll storage and supply device which can not only effectively store a plurality of label paper rolls, but also prevent label paper rolls from being unwound.

SUMMERY OF THE UTILITY MODEL

In order to overcome the technique, do not have a practical label scroll storage device, lead to label paper in disorder and the scattered roll easily, inconvenient drawback of accomodating, the utility model provides a plurality of roll paper mechanism can conveniently pass through the magnet actuation in the shell, and in the use, label paper can not in disorder and the scattered roll, accomodate more conveniently, pull out label paper and do not need manual operation, use more convenient automatic supply arrangement is accomodate to label scroll.

The utility model provides a technical scheme that its technical problem adopted is:

an automatic label paper roll storage and supply device comprises a lithium storage battery, a charging socket and a power switch, and is characterized by also comprising a shell with an open structure at the upper end, a paper rolling mechanism and a control circuit; the paper winding mechanisms are the same and each paper winding mechanism comprises a shell, two sets of motor speed reducing mechanisms and a winding drum, a permanent magnet is fixedly mounted at the lower end of the shell, and an opening is formed in the upper part of the front end of the shell; the left end and the right end of the middle part of the shell are respectively provided with a screw hole and an opening, the shells of the two sets of motor reducing mechanisms are respectively fixedly arranged at the front part of the upper end of one side of the shell from top to bottom, two bearing seats are respectively and fixedly arranged at the upper front end in the shell, connecting shafts are respectively and transversely and fixedly arranged at the middle parts in the two winding drums, one ends of the two connecting shafts are respectively sleeved in the inner rings of the two bearing seats, and the power output shafts of the two sets of motor reducing mechanisms and the other ends of the; the two winding drums are distributed on a vertical plane from top to bottom, and the two winding drums are closely connected together; a plurality of openings are arranged at intervals on the upper part of the front end of the shell; each roll of label paper is placed in each shell, the permanent magnets at the lower part of the shell of the paper winding mechanism are respectively attracted to the lower part of the shell from left to right, and the upper end of the shell is matched with a movable cover; the multiple sets of control circuits comprise photoelectric switches and relays, and the multiple sets of photoelectric switches are respectively installed in the multiple openings in the upper part of the front end of the shell from left to right; the relays, the lithium storage batteries, the charging sockets and the power switches of the multiple sets of control circuits are arranged in the element box; the power supply two ends of the lithium storage battery are connected with the two wiring ends of the charging socket and the two input ends of the photoelectric switch power supply of the multi-way control circuit through leads respectively, the normally open contact ends of the relays of the multiple sets of photoelectric switches are connected with the power supply input ends of the motor speed reducing mechanisms of the multiple paper rolling mechanisms through leads respectively, the power supply input ends of the motor speed reducing mechanisms of the multiple paper rolling mechanisms are connected with the negative electrode of the lithium storage battery through leads, and the power supply switch is connected between the positive electrode of the lithium storage battery and the positive power supply input end of the photoelectric switch of the multi-way control circuit in.

Furthermore, the shell is made of steel, two wires of the two motor speed reducing mechanisms of each paper rolling mechanism are connected in parallel, and the positive pole and negative pole power supply input end of one motor is connected with the negative pole and positive pole power supply input end of the other motor.

Furthermore, the positive power input end of the photoelectric switch of each set of control circuit is connected with the control power input end of the relay, the positive power output end of the photoelectric switch is connected with the positive power input end of the relay, and the negative power input end of the photoelectric switch is connected with the negative power input end of the relay.

The utility model has the advantages that: before this novel use, the user puts into the rectangular shell of a plurality of stock form mechanisms to the many rolls of label paper that the printing has different marks respectively, then the casing of a plurality of stock form mechanisms from left to right respectively the actuation in the shell, control multichannel control circuit's photoelectric switch respectively, make before the stock form of every label paper roll one section be located between two winding cylinders and be located the rectangle opening outside end of shell, then just can put into use, do not carry out above-mentioned operation again when follow-up not changing the label paper roll. In the practical use of the utility model, a user approaches the front end of the shell of a corresponding label paper roll with hands and is about 3 cm in front of a photoelectric switch in one of the openings on the upper part of the rectangular opening of the shell according to needs, so under the combined action of the photoelectric switch and a matched relay, two sets of motor reducing mechanisms of a corresponding paper rolling mechanism can be powered on to work simultaneously, a power output shaft of the motor reducing mechanism on the upper end of the shell drives a cylindrical winding drum to rotate clockwise, a power output shaft of the motor reducing mechanism on the lower end of the shell drives the cylindrical winding drum to rotate anticlockwise, so that a section of the front end of the label paper roll in the shell corresponding to the paper rolling mechanism can be sent out forwards, after the user leaves the front end of the photoelectric switch, the motor reducing mechanism does not work any more, and thus, the user can conveniently tear off a section of label paper and tear a non-sticky label on the label paper subsequently, the adhesive is adhered to the surface of the object to be used as a mark. This novel a plurality of winder mechanism can conveniently pass through the magnet actuation in the shell, and in the use, label paper can not be in disorder and the bulk roll, accomodate more conveniently, does not need manual operation when pulling out label paper, and it is more convenient to use. Based on the above, so the utility model discloses good application prospect has.

Drawings

The present invention will be further explained with reference to the drawings and examples.

Fig. 1 is a schematic view of the overall structure of the present invention.

Fig. 2 is a schematic structural view of one of the winding mechanisms of the present invention.

Fig. 3 is a circuit diagram of the present invention.

Detailed Description

As shown in fig. 1 and 2, an automatic label paper roll storing and supplying device includes a lithium storage battery 1, a charging socket 2, a power switch 3, a rectangular housing 5 with an open upper end, a paper winding mechanism 4, and a control circuit 6; the paper winding mechanisms 4 are four in number, each paper winding mechanism comprises a rectangular shell 41, two sets of motor speed reducing mechanisms 42 and a cylindrical winding drum 43, the left part and the right part of the lower end of the shell 41 are respectively adhered with a rectangular permanent magnet 44 by glue, a rectangular opening 45 is transversely arranged at the upper part of the front end of the rectangular shell 41, the interior of the rectangular shell 41 is of a hollow structure, and the upper end of the rectangular shell 41 is of an open structure; the left end and the right end of the middle part of the rectangular shell are respectively provided with a screw hole 46 and an opening 47, the left ends of the shells of the two sets of motor reducing mechanisms 42 are respectively arranged at the front part of the upper end of the right side of the rectangular shell 41 from top to bottom through screw nuts, two bearing seats 49 are respectively arranged at the left end of the opening of the shell 41 and the front upper left part of the shell from top to bottom, the inner middle parts of the two cylindrical winding cylinders 43 are respectively and transversely welded with a connecting shaft 48, the left ends of the two connecting shafts 48 are respectively sleeved in the bearing inner rings of the two bearing seats 49, the right ends of the two connecting shafts 48 are respectively arranged outside the two openings which are respectively arranged at the front upper right part of the shell 41 from top to bottom, and the left ends of the power output; the two cylindrical winding drums 43 are distributed on a vertical plane from top to bottom, and the two cylindrical winding drums 43 are closely arranged together (the gap can ensure that the label paper is tightly attached to the upper ends and the lower ends of the two cylindrical winding drums 43 to pass through); four rectangular openings 51 are formed in the upper portion of the front end of the shell 5 at intervals from left to right, label paper is wound on the outer side of the cylindrical hollow pipe 7 in a coiled mode, and the front-back width and the left-right width of the label paper roll 8 are smaller than the inner front-back width and the inner left-right width of the shell 41 respectively; each roll of label paper 8 is placed into each shell 41 from top to bottom, the four screws 9 penetrate into the cylindrical hollow tube 7 in the middle of each roll of label paper through the middle openings 46 in the right side of the four shells respectively, the left ends of the four screws 9 are screwed into the internal thread screw holes 47 in the middle openings in the left side of the shells respectively, each roll of label paper 8 is installed inside each shell 41, the inner diameter of the cylindrical hollow tube 7 is larger than the outer diameter of the screws 9, and the transverse length of the cylindrical hollow tube 7 is consistent with that of each roll of label paper 8; the shells of the four paper winding mechanisms 4 are respectively attracted to the lower part of the shell 5 from left to right through the permanent magnets 44 at the lower parts of the shells, the front end opening 45 (smaller than the inner diameter of the upper opening 51 at the front end of the shell) of each paper winding mechanism is aligned with one of the rectangular openings 51 distributed from left to right at the upper part at the front end of the shell in a front-back position, and one section of the front upper end of each label paper roll 8 is positioned in the two winding cylinders 43 and is positioned outside one of the rectangular openings 51 at the upper end at the front part of the shell; the upper end of the shell is matched with a movable cover 52, two hinges are welded at the left part and the right part of the rear side end of the movable cover 52, and the rear parts of the hinges are welded at the left part and the right part of the rear upper end of the shell 5; the four sets of control circuits comprise photoelectric switches 61 and relays 62, the four sets of photoelectric switches 61 are respectively installed in four openings on the upper parts of the four openings 51 at the front end of the shell from left to right, and detection heads of the photoelectric switches 61 are positioned at the front end; the relays 62 of the four sets of control circuits are arranged on a circuit board in the element box 10, the lithium storage battery 1, the charging socket 2 and the power switch 3 are arranged in the element box 10, and the jacks of the charging socket 2 and the operating handle of the power switch 3 are respectively positioned outside the two openings at the front end of the element box 10. The component case 10 is mounted in the middle of the front end of the housing 5. The rectangular housing 5 is made of steel. The motor reducing mechanism 42 is a finished product of a 12V micro motor gear reducer with the brand JCS and the model N20, the power is 1.5W, and the power output by the motor is reduced by a multi-stage reducing gear in the left end of the shell to increase the torque and then is output from a power output shaft at the left end when the motor reducing mechanism works.

As shown in fig. 3, the lithium secondary battery G is 12V/2Ah in type, the charging socket CZ is a coaxial power socket (after the lithium secondary battery G is not powered, a plug of an external 12V power charger can be inserted into the charging socket CZ to charge the lithium secondary battery G), and the power switch S is a toggle power switch. Two leads of two sets of motor speed reducing mechanisms MN1 of the first paper rolling mechanism are connected in parallel, wherein the positive pole and negative pole power input ends of one set of motor are connected with the negative pole and positive pole power input ends of the other set of motor. Two sets of motor speed reducing mechanisms MN2 of the second paper rolling mechanism are connected in parallel, wherein the positive pole and negative pole power input ends of one set of motor are connected with the negative pole and positive pole power input ends of the other set of motor. Two leads of two sets of motor speed reducing mechanisms MN3 of the third paper rolling mechanism are connected in parallel, wherein the positive pole and negative pole power input ends of one set of motor are connected with the negative pole and positive pole power input ends of the other set of motor. Two leads of two sets of motor speed reducing mechanisms MN4 of the fourth paper winding mechanism are connected in parallel, wherein the positive pole and negative pole power input ends of one set of motor are connected with the negative pole and positive pole power input ends of the other set of motor. The positive power input end pin 1 of the photoelectric switch A1 of the first set of control circuit is connected with the control power input end of the relay K1, the positive power input end pin 1 of the photoelectric switch A2 of the second set of control circuit is connected with the control power input end of the relay K2, the positive power input end pin 1 of the photoelectric switch A3 of the third set of control circuit is connected with the control power input end of the relay K3, and the positive power input end pin 1 of the photoelectric switch A4 of the fourth set of control circuit is connected with the control power input end of the relay K4. Photoelectric switch A1, A2, A3, A4 have three wires, two 1 and 2 feet are power input wires, another 3 feet are power output wires, photoelectric switch is the photoelectric proximity switch of brand OMDHON, its casing front end is the detecting head, the rear end has adjust knob (adjust knob revolves left, photoelectric switch's detection distance becomes nearly, adjust knob revolves right, photoelectric switch's detection distance becomes far away, this novel regulation back detection distance is 3 centimetres), in operation, the straight line infrared ray that launches at casing front end detecting head is blockked by the front end article and is returned, after the receiving head of detecting head received, 3 feet of photoelectric switch can export anodal power. The 3 feet of the positive power supply output end of the photoelectric switch A1 is connected with the positive power supply input end of the relay K1, the 2 feet of the negative power supply input end of the photoelectric switch A1 is connected with the negative power supply input end of the relay K1, the 3 feet of the positive power supply output end of the photoelectric switch A2 is connected with the positive power supply input end of the relay K2, the 2 feet of the negative power supply input end of the photoelectric switch A2 is connected with the negative power supply input end of the relay K2, the 2 feet of the negative power supply input end of the photoelectric switch A3 is connected with the negative power supply input end of the relay K3, the 2 feet of the negative power supply input end of the photoelectric switch A3 is connected with the negative power supply input end of the relay K4, the 2 feet of the negative power supply input end of the photoelectric switch A4 is connected with the negative power supply input end of the relay. Two ends of a power supply of a lithium storage battery G are connected with two terminals of a charging socket CZ, two pins of photoelectric switches A1, A2, A3 and A4 of a four-way control circuit are respectively connected through leads, normally open contact ends of relays K1, K2, K3 and K4 of the four sets of photoelectric switches are respectively connected with one ends of power supply inputs of motor reducing mechanisms MN1, MN2, MN3 and MN4 of the four paper winding mechanisms through leads, the other ends of the power supply inputs of the motor reducing mechanisms MN1, MN2, MN3 and MN4 of the four paper winding mechanisms are connected with the negative electrode of the lithium storage battery G through leads, and a power switch S is connected between the positive electrode of the lithium storage battery G and the pins of the photoelectric switches A1, A2, A3 and A4 of the four-way control circuit in series.

As shown in fig. 1, 2 and 3, before the novel paper rolling mechanism is used, a user puts four rolls of label paper 8 printed with different marks into rectangular shells 41 of the four paper rolling mechanisms respectively, four screws 9 penetrate into cylindrical hollow tubes 7 in the middle of each roll of label paper through middle holes 46 in the four shells on the right sides respectively, the left ends of the four screws 9 are screwed into internal thread holes 47 in the middle of the middle holes of the left sides in the shells respectively, so that each roll of label paper 8 is installed inside each shell 41 (the lower part of each label paper roll 8 and the lower end in each shell 41 are spaced by a certain distance), then the shells 41 of the four paper rolling mechanisms are respectively sucked into the lower parts in the shells 5 from left to right, and the front and back positions of a shell front end opening 45 of each paper rolling mechanism and one of rectangular openings 51 distributed on the upper part of the front end of each shell from left to right are. Then, the user approaches the front of the detecting heads of the photoelectric switches a1, a2, A3 and a4 of the four-way control circuit by fingers by about 3 centimeters, so that the photoelectric switches a1, a2, A3 and a4 of the four-way control circuit respectively output positive power to enter the positive power input ends of the relays K1, K2, K3 and K4; because the negative power input ends of the relays K1, K2, K3 and K4 are connected with the negative electrode of the lithium storage battery G, the control power input ends of the relays K1, K2, K3 and K4 are connected with the positive electrode of the lithium storage battery G, the normally open contact ends of the relays K1, K2, K3 and K4 are respectively connected with the power input ends of the motor reducing mechanisms MN1, MN2, MN3 and MN4 of the four paper rolling mechanisms, and the power input ends of the motor reducing mechanisms MN1, MN2, MN3 and MN4 of the four paper rolling mechanisms are respectively connected with the negative electrode of the lithium storage battery G, at the moment, the relays K1, K2, K3 and K4 are respectively electrified to attract the control power input ends and the normally open contact ends of the relays to be closed, and further the motor reducing mechanisms MN1, MN2, MN3 and MN4 of the four paper rolling mechanisms are respectively electrified to work; because the positive and negative power input ends of one set of motor of the motor speed reducing mechanisms MN1, MN2, MN3 and MN4 of the four paper rolling mechanisms are connected with the negative and positive power input ends of the other set of motor, at the moment, after the motor speed reducing mechanisms MN1, MN2, MN3 and MN4 of the four paper rolling mechanisms positioned at the upper end of the opening 45 of the shell 41 are respectively electrified to work, the power output shafts of the motor speed reducing mechanisms MN1, MN2, MN3 and MN4 of the four paper rolling mechanisms positioned at the lower end of the opening 45 of the shell 41 drive the cylindrical winding drum 43 at the lower end of the opening 45 to rotate clockwise, and after the motor speed reducing mechanisms MN1, MN2, MN3 and MN4 of the four paper rolling mechanisms positioned at; thus, before use, a user respectively controls the photoelectric switches A1, A2, A3 and A4 of the four-way control circuit by one hand, after the upper end cylindrical winding drum 43 and the lower end cylindrical winding drum 43 of the opening 45 of each winding mechanism synchronously rotate in opposite directions, and after the front end of the upper end label paper roll 8 of each winding mechanism is placed between the upper end cylindrical winding drum 43 and the lower end cylindrical winding drum 43 by one hand (the lower part of the upper end cylindrical winding drum and the upper part of the lower end cylindrical winding drum), the two cylindrical winding drums which rotate oppositely can take out the front end of the label paper roll 8 and locate outside the front end of the opening 51 of the shell, so that subsequent use is facilitated, and then the upper cover 52 of the shell 5 is covered (52-1 is an operating handle of the upper cover of. In the operation, when the hand of a user leaves the front of the detection head of the corresponding set of photoelectric switches by more than 3 centimeters, the 3 feet of the set of photoelectric switches do not output high level any more, so that the corresponding relay does not attract any more, the corresponding motor reducing mechanism does not rotate any more, and the label paper roll is not replaced subsequently. In the practical use of the label dispenser, the user can make the steps before the front end of the label paper roll is positioned in the rectangular opening of the shell completely consistent with the above operation according to the requirement, the user approaches the front upper end of the shell of the corresponding label paper roll 8 with hands and the front 3 cm or so of the photoelectric switch 61 detecting head in one of the openings at the upper part of the rectangular opening 51 of the shell, then under the combined action of the photoelectric switch 61 and the matched relay, the two sets of motor reducing mechanisms 42 of the corresponding paper rolling mechanism can be powered on to work simultaneously, the power output shaft of the motor reducing mechanism 42 at the upper end of the shell drives the cylindrical winding drum 43 to rotate clockwise, the power output shaft of the motor reducing mechanism 42 at the lower end of the shell drives the cylindrical winding drum 43 to rotate anticlockwise, and then the front upper section of the label paper roll 8 in the shell 41 of the corresponding paper rolling mechanism can be sent out forwards, The motor reducing mechanism 42 is located at the front outer side of one of the open holes of the shell, and after a user hands away from the front end of the photoelectric switch 61, the motor reducing mechanism does not work any more, so that the user can conveniently tear off a section of label paper and tear off a non-stick label on the label paper, and then the non-stick label is subsequently stuck on the surface of an article. This novel a plurality of paper casing can conveniently pass through magnet 44 actuation in the shell, and in the use, label paper can not be in disorder and the bulk roll, accomodate more conveniently, pulls out label paper and does not need manual operation, and it is more convenient to use. Relays K1, K2, K3, and K4 are Songle brand DC4123 type 12V direct current small relays.

The essential features of the invention and the advantages of the invention have been shown and described above, it being obvious to a person skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, but that it can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (3)

1. An automatic label paper roll storage and supply device comprises a lithium storage battery, a charging socket and a power switch, and is characterized by also comprising a shell with an open structure at the upper end, a paper rolling mechanism and a control circuit; the paper winding mechanisms are the same in number, the control circuit is provided with a plurality of sets, each paper winding mechanism comprises a shell, two sets of motor speed reducing mechanisms and a winding drum, a permanent magnet is fixedly mounted at the lower end of the shell, and an opening is formed in the upper part of the front end of the shell; the left end and the right end of the middle part of the shell are respectively provided with a screw hole and an opening, the shells of the two sets of motor reducing mechanisms are respectively fixedly arranged at the front part of the upper end of one side of the shell from top to bottom, two bearing seats are respectively and fixedly arranged at the upper front end in the shell, connecting shafts are respectively and transversely and fixedly arranged at the middle parts in the two winding drums, one ends of the two connecting shafts are respectively sleeved in the inner rings of the two bearing seats, and the power output shafts of the two sets of motor reducing mechanisms and the other ends of the; the two winding drums are distributed on a vertical plane from top to bottom, and the two winding drums are closely connected together; a plurality of openings are arranged at intervals on the upper part of the front end of the shell; a roll of label paper is placed in each shell, the permanent magnets at the lower part of the shell of the paper winding mechanism are respectively attracted to the lower part of the shell from left to right, and the upper end of the shell is matched with a movable cover; the multiple sets of control circuits comprise photoelectric switches and relays, and the multiple sets of photoelectric switches are respectively installed in the multiple openings in the upper part of the front end of the shell from left to right; the relays, the lithium storage batteries, the charging sockets and the power switches of the multiple sets of control circuits are arranged in the element box; the power supply two ends of the lithium storage battery are connected with the two wiring ends of the charging socket and the two input ends of the photoelectric switch power supply of the multi-way control circuit through leads respectively, the normally open contact ends of the relays of the multiple sets of photoelectric switches are connected with the power supply input ends of the motor speed reducing mechanisms of the multiple paper rolling mechanisms through leads respectively, the power supply input ends of the motor speed reducing mechanisms of the multiple paper rolling mechanisms are connected with the negative electrode of the lithium storage battery through leads, and the power supply switch is connected between the positive electrode of the lithium storage battery and the positive power supply input end of the photoelectric switch of the multi-way control circuit in.

2. The automatic labeling paper roll containing and supplying device as claimed in claim 1, wherein the housing is made of steel, two wires of two motor speed reducing mechanisms of each paper rolling mechanism are connected in parallel, wherein the positive and negative power input ends of one motor are connected with the negative and positive power input ends of the other motor.

3. The automatic labeling paper roll containing and supplying device as claimed in claim 1, wherein the positive power input terminal of the photoelectric switch of each set of control circuit is connected with the control power input terminal of the relay, the positive power output terminal of the photoelectric switch is connected with the positive power input terminal of the relay, and the negative power input terminal of the photoelectric switch is connected with the negative power input terminal of the relay.

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