CN215402250U

CN215402250U - Paying-off device

Info

Publication number: CN215402250U
Application number: CN202122113145.0U
Authority: CN
Inventors: 郭来泉; 郭海根; 杨川; 刘勇
Original assignee: Wuxi Zhongding Electrician Machinery Co ltd
Current assignee: Wuxi Zhongding Electrician Machinery Co ltd
Priority date: 2021-09-02
Filing date: 2021-09-02
Publication date: 2022-01-04
Anticipated expiration: 2031-09-02

Abstract

The utility model discloses a paying-off device, which comprises a base, a rack arranged on the base, a lifting arm arranged on the rack in a lifting and moving manner and a wire coil rotatably arranged on the lifting arm, wherein the lifting arm is in an inverted U shape, one side of the lifting arm is rotatably provided with a rotating shaft and a first motor for driving the rotating shaft to rotate, one end of the rotating shaft is fixedly provided with a first fixed disk, the other end of the lifting arm is provided with a driving piece, one end of the driving piece is rotatably provided with a second fixed disk, the second fixed disk can be close to or far away from the first fixed disk under the driving of the driving piece, the wire coil can be clamped between the first fixed disk and the second fixed disk, and a sliding plate is slidably arranged under the wire coil on the base along the axial direction of the wire coil. The wire releasing device disclosed by the utility model has the advantages that the wire coil does not need to be manually lifted, the wire coil is not easy to roll off, the clamping is firm, the operation is simple, convenient and safe, the disassembling and assembling efficiency is improved, and the popularization and the use are convenient.

Description

Paying-off device

Technical Field

The utility model relates to the technical field of pay-off devices, in particular to a pay-off device.

Background

In the cable production process, need adopt the pay off rack to carry out the unwrapping wire operation, the during operation, need will treat the drum installation to the frame of unwrapping wire, traditional mounting means has two kinds, and the first kind is through installing again after artifical manual support drum, and the second kind is through installing again after lift platform holds up the drum. For the first mode, the operation is required to be completed by multiple persons, the operation is troublesome, the labor cost is high, and the efficiency is low; for the second mode, after the wire coil is lifted to the installation position, the height of the wire coil from the ground is larger, so that the wire coil is likely to fall off in the installation process, and certain potential safety hazards exist for operators.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: in order to overcome the defects in the prior art, the paying-off device convenient for disassembling and assembling the wire coil is provided.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the utility model provides a pay-off, includes the base, locates frame, liftable on the base are located with removing lifting arm in the frame and rotationally locate drum on the lifting arm, the lifting arm is "n" shape, pivot and drive are rotationally installed to one side of lifting arm the first motor of pivot pivoted, the fixed first fixed disk that is equipped with of one end of pivot, the other end of lifting arm is provided with the driving piece, the second fixed disk is rotationally installed to the one end of driving piece, the second fixed disk is in can be close to or keep away from under the drive of driving piece first fixed disk, the drum can be by the centre gripping first fixed disk reaches between the second fixed disk, lie in on the base follow under the drum the axial slidable ground of drum is provided with the slide.

Furthermore, the lifting arm comprises a cross beam, a first longitudinal beam and a second longitudinal beam, the first longitudinal beam and the second longitudinal beam are connected to the two opposite ends of the cross beam, the cross beam is longitudinally slidably connected to the rack, the rotating shaft is rotatably connected with the first longitudinal beam, and the driving piece is connected with the second longitudinal beam.

Furthermore, the top of the cross beam is in threaded connection with a lifting screw rod, a second motor is installed on the rack, and the second motor can drive the lifting screw rod to rotate.

Furthermore, a fixing sleeve is fixedly inserted in the first longitudinal beam, the rotating shaft is rotatably arranged in the fixing sleeve in a penetrating mode, and a bearing is arranged between the rotating shaft and the fixing sleeve.

Further, the driving piece includes a connecting sleeve, the connecting sleeve is worn to establish on the second longeron, the one end fixed mounting of connecting sleeve has the end cover, rotationally installs on the end cover and supports and push up the lead screw, along axial slidable ground inlay card in the connecting sleeve is connected with the slip post, the slip post with support and push up lead screw threaded connection, the second fixed disk with the slip post is rotationally connected.

Furthermore, one end, far away from the second fixed disk, of the abutting screw rod is provided with a manual rocking wheel.

Further, the connecting sleeve is a threaded sleeve, and the connecting sleeve is in threaded connection with the second fixed disk.

Further, the through-hole has been seted up along the axial in the center of drum, the one end of pivot is provided with first top, the protruding second top that is equipped with in center of second fixed disk, first top with the second top all with the through-hole cooperatees.

Furthermore, the base is provided with a guide groove, the sliding plate is slidably arranged in the guide groove, supporting shafts are arranged at two opposite ends of the sliding plate, supporting wheels are rotatably arranged at two ends of the supporting shafts, and the supporting wheels are in rolling connection with the upper surface of the base.

Furthermore, an inclined plane is arranged on one side, close to the guide groove, of the base.

The utility model has the beneficial effects that: according to the paying-off device, the wire coil is arranged on the lifting arm, the lifting arm can be moved downwards, the wire coil can be quickly clamped on the lifting arm, manual operation for lifting the wire coil is not needed, meanwhile, the wire coil can be quickly moved in place through the sliding plate, compared with a traditional installation mode, the wire coil is not needed to be manually lifted, the wire coil is not prone to rolling off, clamping is firm, operation is simple, convenient and safe, dismounting efficiency is improved, and popularization and use are facilitated.

Drawings

The utility model is further illustrated by the following figures and examples.

FIG. 1 is a perspective view of the reel-to-reel automatic centering payoff device of the present invention;

FIG. 2 is a front view of the reel-shifting type automatic centering pay-off device shown in FIG. 1;

FIG. 3 is a top view of a tension device in the reel-to-reel self-centering payout device shown in FIG. 1;

FIG. 4 is a partial enlarged view of the traverse table type automatic centering pay-off device shown in FIG. 1 at A;

FIG. 5 is a partial enlarged view of the reel-moving type automatic centering pay-off device shown in FIG. 2 at B;

FIG. 6 is an enlarged fragmentary view of the tensioning device of FIG. 3 at C;

FIG. 7 is a perspective view of another perspective of the pay-off device in the reel-moving type automatic centering pay-off device shown in FIG. 1;

FIG. 8 is a cross-sectional view along D-D of the reel-moving type automatic centering pay-off device shown in FIG. 2.

The names and the numbers of the parts in the figure are respectively as follows:

base 11 slide rail 111 of paying-off device 10

Chute 112 ramp 113 frame 12

Connecting block 121 bottom plate 122 support frame 123

Driving mechanism 13 of reinforcing plate 124 of sliding block 1221

Drive motor 131 translates lead screw 132 spool 14

Through hole 141 lifting arm 15 rotating shaft 151

First plug 1511 first motor 152 first fixed disk 153

End cap 1542 of driving member 154 connecting sleeve 1541

Manual rocking wheel 1545 for propping against screw rod 1543 sliding column 1544

Second fixed disk 155 and second ejector 1551 sliding plate 156

Support shaft 1561 support wheel 1562 cross beam 157

Lifting screw 1571, second motor 1572 and first longitudinal beam 158

Second stringer 159 tensioning device 20 of fixing sleeve 1581

Tension bracket 21 restraint piece support 211 sensor support 212

Waist-shaped groove 213 limiting roller 214L-shaped connecting rod 215

Cylinder 216 beam-limiting piece 22 beam-limiting channel 221

Spacing column 222 photoelectric sensor 23 wire passing wheel 24

Tension pulley 25

Detailed Description

The present invention will now be described in detail with reference to the accompanying drawings. This figure is a simplified schematic diagram, and merely illustrates the basic structure of the present invention in a schematic manner, and therefore it shows only the constitution related to the present invention.

Referring to fig. 1-6, the present invention provides a reel-moving type automatic centering pay-off device, which includes a pay-off device 10, a tension device 20 and a controller (not shown), wherein the pay-off device 10 includes a base 11, a frame 12, a driving mechanism 13 and a reel 14, the frame 12 is slidably disposed on the base 11, the reel 14 is rotatably mounted on the frame 12, the driving mechanism 13 includes a driving motor 131 mounted on the base 11 and a translation screw 132 connected to the driving motor 131, the translation screw 132 is in threaded connection with a connecting block 121 connected to the frame 12, the tension device 20 includes a tension frame 21, a limiting member 22 mounted on the tension frame 21 and a photoelectric sensor 23, the tension frame 21 is located at one side of the base 11, the limiting member 22 is provided with a limiting channel 221 for a cable to pass through, the limiting channel 221 corresponds to the reel 14, the photoelectric sensor 23 has two limiting members 22 and is located between the limiting member 22 and the reel 14, the two photoelectric sensors 23 are respectively located at two opposite sides of the beam limiting channel 221, and the photoelectric sensors 23 and the driving motor 131 are electrically connected with the controller.

When the moving-disc type automatic centering paying-off equipment is used, a cable wound on the drum 14 is gradually released under the rotating action of the drum 14, one end of the cable passes through the beam limiting channel 221 after passing through the photoelectric sensor 23, and then enters the next procedure (for example, a wrapping procedure). In the process, when the cable is deviated and then enters the sensing area of the photoelectric sensor 23, light emitted by the emitting end of the photoelectric sensor 23 is shielded by the cable, the receiving end of the photoelectric sensor 23 cannot receive optical signals, at the moment, the photoelectric sensor 23 feeds the information back to the controller, and the controller receives the feedback and then controls the driving motor 131 to rotate so as to drive the rack 12 to move together with the wire coil 14, so that the deviation angle of the cable is adjusted in real time, the cable is guaranteed to be located between the two photoelectric sensors 23 all the time, the automatic centering function of the cable is realized, the abrasion of the cable is reduced, the tension of the cable tends to be consistent, and the processing quality of the cable is improved.

Specifically, referring to fig. 4-6, a beam limiting bracket 211 and a sensor bracket 212 are mounted at one end of the tension bracket 21, the beam limiting member 22 includes two limiting posts 222 connected to the beam limiting bracket 211, the two limiting posts 222 are vertically disposed and correspond to each other, the beam limiting channel 221 is formed by a space between the two limiting posts 222, the two sensor brackets 212 are horizontally disposed, the emitting end of the photoelectric sensor 23 is mounted on one of the sensor brackets 212, and the receiving end of the photoelectric sensor 23 is correspondingly mounted on the other sensor bracket 212. In use, the cable released from the drum 14 passes through the limiting channel 221 between the two limiting columns 222 and then enters the next process, and it is understood that in other embodiments not shown, the limiting member 22 may also be a block-shaped structure, and the limiting channel 221 is a through hole opened on the limiting member 22.

In this embodiment, the beam limiter holder 211 and the sensor holder 212 are respectively provided with an elongated groove 213 along the length direction thereof, the beam limiter 22 can be moved and fixed along the elongated groove 213 of the beam limiter holder 211, and the photoelectric sensor 23 can be moved and fixed along the elongated groove 213 of the sensor holder 212. When the cable is used, a user can adaptively adjust the positions of the beam limiter 22 and the photoelectric sensor 23 according to the thickness of the cable so as to meet the use requirement. In the present embodiment, the beam limiter 22 and the photosensor 23 are fixed to the beam limiter holder 211 and the sensor holder 212 by screws after the position adjustment is completed.

In addition, one end of the tension bracket 21 is rotatably provided with two limiting rollers 214, the limiting rollers 214 are positioned on one side of the sensor bracket 212 far away from the beam limiting piece bracket 211, the extending direction of the two limiting rollers 214 is the same as that of the sensor bracket 212, and the distance between the two limiting rollers 214 is smaller than that between the two sensor brackets 212. When the cable releasing device is used, a cable released through the wire coil 14 passes through the sensor bracket 212 after passing through a gap between the two limiting rollers 214, and the two limiting rollers 214 can limit and guide the position of the cable passing through the sensor bracket 212, so that the cable can move conveniently.

Referring to fig. 1 and fig. 2 again, the tension device 20 of the present invention further includes two wire-passing wheels 24 mounted on the tension frame 21 and a tension wheel 25 located between the two wire-passing wheels 24, the wire-passing wheels 24 are rotatably mounted on the tension frame 21, an L-shaped connecting rod 215 is rotatably mounted on the tension frame 21, the tension wheel 25 is rotatably mounted at one end of the L-shaped connecting rod 215, an air cylinder 216 is hinged between the other end of the L-shaped connecting rod 215 and the tension frame 21, wherein an end of the air cylinder 216 is hinged to the tension frame 21, and an extending end of the air cylinder 216 is hinged to the L-shaped connecting rod 215. When the cable tensioning device is used, one end of a cable passes through the limiting channel 221 and then sequentially winds around one of the wire guide wheels 24, the tensioning wheel 25 and the other wire guide wheel 24 and then enters a next production line (for example, a wrapping production line), and the L-shaped connecting rod 215 can be driven to rotate together with the tensioning wheel 25 by controlling the extension amount of the extension end of the air cylinder 216, so that the cable is tensioned.

Referring to fig. 7, in the present embodiment, the rack 12 includes a bottom plate 122 and a supporting frame 123 connected to the bottom plate 122, the bottom plate 122 is connected to the base 11 in a sliding manner, the wire coil 14 is rotatably disposed on the supporting frame 123, a sliding rail 111 is disposed on an upper surface of the base 11, a sliding block 1221 is connected to a lower surface of the bottom plate 122, and the sliding block 1221 is connected to the sliding rail 111 in a sliding and embedding manner. During the use, thereby driving connecting block 121 and removing by driving motor 131 drive translation lead screw 132 rotation, and then when driving bottom plate 122 to remove, slider 1221 slides along slide rail 111. Further, the driving motor 131 is a forward and reverse rotation motor so that the frame 12 can be laterally reciprocated.

In addition, in order to improve the connection stability between the support frame 123 and the bottom plate 122, a reinforcing plate 124 is connected between the support frame 123 and the bottom plate 122.

In other embodiments, which are not shown, the driving rack 12 may also be in a rack-and-pinion transmission manner, for example, a rack is installed on the rack 12, a gear is installed on one side of the rack 12 in a rotating manner, and when in use, the rack is driven to move by rotating the gear, so as to drive the rack 12 to move; alternatively, the drive mechanism 12 may be moved by direct actuation of a compression cylinder, for example, by mounting the cylinder on the base 11 with the extended end of the cylinder connected to the frame 12, and in use, by controlling the cylinder to move the frame 12. In the present embodiment, the driving method of the frame 12 is not particularly limited.

Referring to fig. 1 and 8, in the present embodiment, the wire releasing device 10 further includes a lifting arm 15, the wire coil 14 is rotatably mounted on the lifting arm 15, the lifting arm 15 is movably mounted on the frame 12, the lifting arm 15 is n-shaped, one side of the lifting arm 15 is rotatably mounted with a rotating shaft 151 and a first motor 152 for driving the rotating shaft 151 to rotate, one end of the rotating shaft 151 is fixedly provided with a first fixing disc 153, the other end of the lifting arm 15 is provided with a driving member 154, one end of the driving member 154 is rotatably mounted with a second fixing disc 155, the second fixing disc 155 can be close to or far away from the first fixing disc 153 under the driving of the driving member 154, the wire coil 14 can be clamped between the first fixing disc 153 and the second fixing disc 155, and a sliding plate 156 is slidably disposed on the base 11 under the wire coil 14 along the axial direction of the wire coil 14. In addition, the first motor 152 drives the rotation shaft 151 to rotate through a reduction gear.

When the wire releasing device 10 disclosed by the utility model is used for mounting a wire coil 14 to be released, the wire coil 14 is firstly placed on the sliding plate 156, then the lifting arm 15 is moved downwards, so that the lifting arm 15 is erected outside the wire coil 14, then the axial displacement of the sliding plate 156 and the longitudinal displacement of the lifting arm 15 are adjusted, so that the first fixed disk 153 is attached to one side wall of the wire coil 14, the second fixed disk 155 is attached to the other side wall of the wire coil 14, and then the wire coil 14 is fixed between the first fixed disk 153 and the second fixed disk 155, so that the clamping and fixing effects on the wire coil 14 are realized. After the wire coil 14 is clamped in place, the lifting arm 15 is moved upwards until the wire coil 14 reaches a proper height. When releasing the wire, the first motor 152 is activated to drive the rotating shaft 151 to rotate together with the first fixing disc 153, so as to drive the wire coil 14 to rotate, thereby realizing the wire releasing function.

In this embodiment, the lifting arm 15 includes a cross member 157, and a first longitudinal member 158 and a second longitudinal member 159 connected to opposite ends of the cross member 157, the cross member 157 is slidably connected to the support frame 123 of the frame 12 in the longitudinal direction, the rotating shaft 151 is rotatably connected to the first longitudinal member 158, and the driving member 154 is connected to the second longitudinal member 159.

Specifically, the top of the cross beam 157 is connected with a lifting screw 1571 through a thread, a second motor 1572 is installed on the frame 12, the second motor 1572 can drive the lifting screw 1571 to rotate, and when the lifting device is used, the lifting screw 1571 is driven to rotate through the second motor 1572 so as to drive the lifting arm 15 to move longitudinally. In this embodiment, the second motor 1572 drives the lifting screw 1572 to rotate through the speed reducer.

Fixed sleeve 1581 is fixed to be inserted on first longeron 158, and in fixed sleeve 1581 was rotationally worn to locate by pivot 151, for the smooth and easy degree that promotes pivot 151 pivoted, be provided with the bearing between pivot 151 and the fixed sleeve 1581.

The driving member 154 includes a connecting sleeve 1541, the connecting sleeve 1541 is disposed through the second longitudinal beam 159, an end cover 1542 is fixedly mounted at one end of the connecting sleeve 1541, a propping screw rod 1543 is rotatably mounted on the end cover 1542, a sliding column 1544 is slidably inserted into the connecting sleeve 1541 along the axial direction, so that the sliding column 1544 can only slide along the axial direction of the connecting sleeve 1541, but cannot rotate, in addition, the sliding column 1544 is in threaded connection with the propping screw rod 1543, and the second fixing disc 155 is rotatably connected with the sliding column 1544. When the sliding device is used, a user can drive the sliding column 1544 to slide by rotating the propping screw rod 1543 so as to drive the second fixed disk 155 to move close to or far away from the first fixed disk 153. Further, in order to facilitate the user operation, a manual rocking wheel 1545 is installed at one end of the propping screw rod 1543 away from the second fixing disk 155. In addition, a bearing is installed between the second fixed disk 155 and the sliding column 1544 to support and facilitate smooth rotation of the second fixed disk 155.

In addition, the connecting sleeve 1541 is a threaded sleeve, the connecting sleeve 1541 is in threaded connection with the second fixed disk 155, and when the connecting sleeve 1541 is used, the connecting sleeve 1541 can move fast in the axial direction by screwing in and out the connecting sleeve 1541, so that the second fixed disk 155 can be moved fast to a designated position. To prevent rotation of the connecting sleeve 1541 when the top lead screw 1543 is rotated, the position of the connecting sleeve 1541 can be locked by a wrench when the top lead screw 1543 is rotated.

In this embodiment, a through hole 141 is axially formed in the center of the wire coil 14, a first plug 1511 is disposed at one end of the rotating shaft 151, a second plug 1551 is convexly disposed at the center of the second fixing disk 155, and the first plug 1511 and the second plug 1551 are both matched with the through hole 141. When the wire coil 14 is installed, when the first ejector 1511 and the second ejector 1551 are respectively and correspondingly inserted into the two ends of the through hole 141, the driving member 154 can be driven to drive the second fixing disk 155 to move, and finally the wire coil 14 is clamped between the first fixing disk 153 and the second fixing disk 155, so that the operation is simple and convenient.

In other embodiments, not shown, the drive member 154 may also be a compression cylinder by which, in use, the second fixed disk 155 is driven to move against the drum 14.

Referring to fig. 1 again, in the present embodiment, the base 11 is provided with a guide groove 112, the sliding plate 156 is slidably disposed in the guide groove 112, two opposite ends of the sliding plate 156 are respectively provided with a support shaft 1561, two ends of the support shaft 1561 are rotatably provided with a support wheel 1562, and the support wheel 1562 is in rolling connection with the upper surface of the base 11. When in use, the sliding plate 156 slides along the guide groove 112, which can promote the supporting wheel 1562 to roll on the upper surface of the base 11, reduce the friction between the two, and is beneficial to the smooth sliding of the sliding plate 156.

In addition, the base 11 is provided with a slope 113 on a side close to the guiding groove 112, and the slope 113 can facilitate the rolling of the wire coil 14 onto the sliding plate 156, which is convenient for the user to operate.

According to the disc moving type automatic centering pay-off equipment provided by the utility model, the photoelectric sensor 23 is used for sensing the deviation condition of the cable in the pay-off process, the controller is used for controlling the steering of the driving motor 131 so as to control the rack 12 and the wire coil 14 to move left and right in a reciprocating manner, the automatic centering function of the cable is realized, the cable abrasion is reduced, the cable tension tends to be consistent, and the processing quality of the cable is improved. Meanwhile, the wire coil 14 is arranged on the lifting arm 15, the lifting arm 15 can be moved downwards through the access, the wire coil 14 is rapidly clamped on the lifting arm 15, the operation of manually lifting the wire coil 14 is not needed, meanwhile, the wire coil 14 can be rapidly moved in place through the sliding plate 156, compared with the traditional installation mode, the wire coil 14 is not needed to be manually lifted, the wire coil 14 is not prone to rolling off, the clamping is firm, the operation is simple, convenient and safe, the dismounting efficiency is improved, and the popularization and the use are convenient.

In light of the foregoing description of preferred embodiments in accordance with the utility model, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the scope of the utility model. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A pay-off device characterized by: including the base, locate frame, liftable on the base are located with removing lifting arm in the frame and rotationally locate drum on the lifting arm, the lifting arm is "U" shape, pivot and drive are rotationally installed to one side of lifting arm the first motor of pivot pivoted, the fixed first fixed disk that is equipped with of one end of pivot, the other end of lifting arm is provided with the driving piece, the second fixed disk is rotationally installed to the one end of driving piece, the second fixed disk is in can be close to or keep away from under the drive of driving piece first fixed disk, the drum can be by the centre gripping first fixed disk reaches between the second fixed disk, lie in on the base follow under the drum the axial slidable ground of drum is provided with the slide.

2. The pay-off device as claimed in claim 1, wherein: the lifting arm comprises a cross beam, a first longitudinal beam and a second longitudinal beam, the first longitudinal beam and the second longitudinal beam are connected to the two opposite ends of the cross beam, the cross beam is connected to the rack in a sliding mode along the longitudinal direction, the rotating shaft is rotatably connected with the first longitudinal beam, and the driving piece is connected with the second longitudinal beam.

3. The pay-off device as claimed in claim 2, wherein: the top threaded connection of crossbeam has the lift lead screw, install the second motor in the frame, the second motor can drive the rotation of lift lead screw.

4. The pay-off device as claimed in claim 2, wherein: the first longitudinal beam is fixedly inserted with a fixing sleeve, the rotating shaft is rotatably arranged in the fixing sleeve in a penetrating mode, and a bearing is arranged between the rotating shaft and the fixing sleeve.

5. The pay-off device as claimed in claim 2, wherein: the driving piece comprises a connecting sleeve, the connecting sleeve is arranged on the second longitudinal beam in a penetrating mode, an end cover is fixedly arranged at one end of the connecting sleeve, a propping screw rod is rotatably arranged on the end cover, a sliding column is connected in the connecting sleeve in a clamping and embedding mode along the axial direction in a slidable mode, the sliding column is in threaded connection with the propping screw rod, and the second fixing disc is rotatably connected with the sliding column.

6. The payout device as defined in claim 5 wherein: and one end of the abutting screw rod, which is far away from the second fixed disk, is provided with a manual rocking wheel.

7. The payout device as defined in claim 5 wherein: the connecting sleeve is a threaded sleeve and is in threaded connection with the second fixed disk.

8. The pay-off device as claimed in claim 1, wherein: the through-hole has been seted up along the axial in the center of drum, the one end of pivot is provided with first top, the protruding second top that is equipped with in center of second fixed disk, first top with the second top all with the through-hole cooperatees.

9. The pay-off device as claimed in claim 1, wherein: the base is provided with a guide groove, the sliding plate is slidably arranged in the guide groove, supporting shafts are mounted at two opposite ends of the sliding plate, supporting wheels are rotatably mounted at two ends of each supporting shaft, and the supporting wheels are in rolling connection with the upper surface of the base.

10. The payout device as defined in claim 9 wherein: an inclined plane is arranged on one side, close to the guide groove, of the base.