CN112792396B

CN112792396B - Equidistance cutting control system

Info

Publication number: CN112792396B
Application number: CN202011562082.0A
Authority: CN
Inventors: 赵宏科; 谷国涛; 张宽
Original assignee: Hangzhou Hangcha Precision Manufacturing Co ltd
Current assignee: Hangzhou Hangcha Precision Manufacturing Co ltd
Priority date: 2020-12-25
Filing date: 2020-12-25
Publication date: 2022-10-21
Anticipated expiration: 2040-12-25
Also published as: CN112792396A

Abstract

The invention provides an equidistant cutting control system, which comprises a fixing frame, a cylinder, a cutting mechanism, a sliding base, a fixing mechanism, a clamp, a bearing plate and an electromagnet, wherein the cylinder is arranged on the upper surface of the fixing frame, the cutting mechanism is arranged at the bottom of the cylinder, the bearing plate is arranged below the cutting mechanism, the sliding base is arranged below the bearing plate, the fixing mechanisms are arranged on two sides of the bearing plate, the clamp is arranged above the bearing plate, and the electromagnet is arranged above the fixing mechanism. Can press from both sides the object of getting different shapes through the anchor clamps that set up, make things convenient for cutting mechanism's cutting, through the fixed establishment that sets up, scale mark and the cooperation of adjusting the draw-in groove, realize the fixed of loading board and removal distance's measurement, through removing the loading board to the equidistance cutting of cutting thing is carried out.

Description

Equidistance cutting control system

Technical Field

The invention belongs to the field of cutting control systems, and particularly relates to an equidistant cutting control system.

Background

At present, with the development of the modern machining industry, the requirements on the cutting quality and precision are continuously improved, and the requirements on improving the production efficiency, reducing the production cost and having a high-intelligent automatic cutting function are also improved. The development of the numerical control cutting machine must meet the requirements of the development of the modern machining industry, and the existing cutting device is indispensable equipment for daily life, industry and agriculture.

However, the existing cutting device needs to be used together with a clamp, often one clamp can only fix an object with one shape, and the clamps with different types need to be frequently replaced to perform cutting, so that the operation process is complicated, and equidistant cutting cannot be achieved in the cutting process of some irregular objects, and therefore, an equidistant cutting control system is urgently needed to solve the above problems.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide an equidistant cutting control system, which solves the problems in the background art by adding a fixed frame, an air cylinder, a cutting mechanism, a sliding base, a fixing mechanism, a clamp, a bearing plate and an electromagnet.

The technical scheme of the invention is realized as follows: the utility model provides an equidistance cutting control system, includes mount, cylinder, cutting mechanism, sliding bottom, fixed establishment, anchor clamps, loading board and electro-magnet, the mount upper surface is equipped with the cylinder, the cylinder bottom is equipped with cutting mechanism, the cutting mechanism below is equipped with the loading board, the loading board below is equipped with sliding bottom the loading board both sides are equipped with fixed establishment, the loading board top is equipped with anchor clamps, the fixed establishment top is equipped with the electro-magnet, cutting mechanism includes driving pulley, driven pulley, hold-in range, axis of rotation, pick and motor, motor output shaft front end is equipped with driving pulley, the driving pulley outside is equipped with the hold-in range, the cylinder bottom is equipped with protecting sheathing, the inside pick that is equipped with of protecting sheathing, the inside transmission shaft that is equipped with of pick, the transmission shaft front end is equipped with driven pulley.

As a preferred embodiment, sliding bottom includes slip recess, roll pearl, bearing frame, first screw hole, screw, pivot, through-hole and limiting plate, the sliding bottom upper surface is equipped with a plurality of slip recesses, and is a plurality of the inside ball that rolls that is equipped with respectively of slip recess, the ball that rolls is equipped with the multiunit, the multiunit roll pearl evenly distributed inside the roll recess, the inside pivot that has run through of ball that rolls, the sliding bottom upper surface is equipped with the bearing frame, the inside through-hole that is equipped with of bearing frame, the inside pivot that is equipped with of through-hole, bearing frame upper surface front end and bearing frame upper surface rear end are equipped with first screw hole respectively, the inside screw that is equipped with of first screw hole, sliding bottom upper surface left end and sliding bottom upper surface right-hand member are equipped with the limiting plate respectively, the sliding bottom top is equipped with the loading board, the loading board is the moving mechanism, the pivot is rotary mechanism, the rotation range of pivot is inside the bearing frame, and in the in-of-use process, the loading board slides on the ball that sliding bottom top, and the ball is inside at the bearing frame through the pivot.

As a preferred embodiment, the loading board includes fixed slot, scale mark, adjustment slot and spout, the loading board both sides are equipped with adjustment slot respectively, loading board upper surface left end and loading board upper surface right-hand member are equipped with the scale mark respectively, the range of scale mark is 0mm-20mm, the loading board bottom is equipped with the spout, loading board upper surface center evenly distributed has a plurality of fixed slot, loading board top left end and loading board upper surface right-hand member are equipped with anchor clamps respectively, the loading board both sides are equipped with fixed establishment respectively, and in the in-service use in-process, anchor clamps pass through the fixed slot that the card goes into different positions to change the interval between two anchor clamps.

As a preferred embodiment, anchor clamps include first splint, second splint, third splint, fourth splint, fixed cover, second screw hole, adjusting screw, fixed circular slot and regulation post, the anchor clamps right side is equipped with first splint, the first splint right side is equipped with the arc wall, the first splint back is equipped with the second splint, the second splint back is equipped with a plurality of rubber posts, the anchor clamps left side is equipped with the third splint, third splint left side is equipped with the rubber pad, the anchor clamps front surface is equipped with the fourth splint, fourth splint front surface is equipped with the rectangular channel, the anchor clamps upper surface is equipped with fixed cover, inside and fixed cover inside are equipped with circular through groove, circular through inslot portion is equipped with the regulation post, fixed cover front surface central point puts, fixed cover right side surface central point put, fixed cover back central point put and fixed cover left side central point put and be equipped with a second screw hole respectively, it is equipped with fixed circular slot to adjust post front surface upper end, it is equipped with the inserted block to adjust the post bottom, the inserted block is equipped with two inserted block is located regulation post bottom left end and regulation post bottom right-hand member respectively, in the in-hand member of in-of-using process, uses the second splint to press from both sides to get through the cutting to get the second splint, uses the cutting to use the second splint to press from both sides to get the second splint to carry out the cutting to use the cutting to carry out the cutting and use the object shape, use the cutting to use the second splint to carry out the cutting and use the cutting clamp and use the second splint to get the irregular shape.

As a preferred embodiment, fixed establishment includes bracing piece, sleeve pipe, circular spout, spring, spacing ring, pull rod and cardboard, the bracing piece upper end is equipped with the spacing ring, the sleeve pipe bottom is equipped with circular spout, the intraduct is equipped with the spring, the inside bracing piece that is equipped with of circular spout, the sleeve pipe left side is equipped with splint, the splint bottom is equipped with the latch, and in the in-service use, the latch of cardboard bottom and the regulation draw-in groove intermeshing of loading board top make the unable back-and-forth movement of loading board.

After the technical scheme is adopted, the invention has the beneficial effects that: can press from both sides the object of getting different shapes through the anchor clamps that set up, make things convenient for cutting mechanism's cutting, through the fixed establishment, the scale mark that set up and the cooperation of adjusting the draw-in groove, realize the fixed of loading board and displacement's measurement, through removing the loading board to the equidistance cutting of cutting thing is carried out.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic diagram of the overall structure of an isometric cutting control system according to the invention.

Fig. 2 is an enlarged view of a portion a of an isometric cutting control system of the present invention.

FIG. 3 is a top view of a fixture for an isometric cutting control system of the present invention.

FIG. 4 is a front view of a fixture for an isometric cutting control system of the present invention.

FIG. 5 is a cross-sectional view of a securing mechanism of an isometric cutting control system of the present invention.

Figure 6 is a bottom view of a card of an isometric cutting control system of the present invention.

FIG. 7 is a top view of a carrier plate of an isometric cutting control system of the present invention.

In the figure, 1-fixed frame, 2-cylinder, 3-cutting mechanism, 301-driving pulley, 302-driven pulley, 303-synchronous belt, 304-rotating shaft, 305-toothed sheet, 306-motor, 4-sliding base, 401-sliding groove, 402-rolling ball, 403-bearing seat, 404-first threaded hole, 405-screw, 406-rotating shaft, 407-through hole, 408-limiting plate, 5-fixing mechanism, 501-supporting rod, 502-sleeve, 503-circular sliding groove, 504-spring, 505-limiting ring, 506-pull rod, 507-clamping plate, 5071-clamping tooth, 6-clamp, 601-first clamping plate, 6011-arc groove, 602-second clamping plate, 6021-rubber column, 603-third clamping plate, 6031-rubber pad, 604-fourth clamping plate, 6041-rectangular groove, 605-fixed sleeve, 606-second threaded hole, 607-adjusting screw, 608-fixed circular groove, 609-adjusting column, 6091-insert block, 7-cylinder, 7-bearing plate, 702-fixed plate, 702-scale line, 704-adjusting line, 704-sliding groove, 704-8-sliding groove and electromagnet.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 7, the present invention provides a technical solution: the utility model provides an equidistance cutting control system, including mount 1, cylinder 2, cutting mechanism 3, sliding base 4, fixed establishment 5, anchor clamps 6, loading board 7 and electro-magnet 8, 1 upper surface of mount is equipped with cylinder 2, 2 bottoms of cylinder are equipped with

cutting mechanism

3, 3 below of cutting mechanism are equipped with loading board 7, 7 below of loading board is equipped with sliding base 4, 7 both sides of loading board are equipped with fixed establishment 5, 7 tops of loading board are equipped with

anchor clamps

6, 5 tops of fixed establishment are equipped with electro-magnet 8, cutting mechanism 3 includes driving pulley 301, driven pulley 302, hold-in range 303, axis of rotation 304, flight 305 and motor 306, motor 306 output shaft front end is equipped with driving pulley 301, driving pulley 301 outside is equipped with hold-in range 303, 2 bottoms of cylinder are equipped with protective housing, the inside flight 305 that is equipped with of protective housing, the inside transmission shaft that is equipped with of flight 305, the transmission shaft front end is equipped with driven pulley 302.

Referring to fig. 1 to 2, the sliding base 4 includes a sliding groove 401, a rolling ball 402, a bearing seat 403, a first threaded hole 404, a screw 405, a rotating shaft 406, a through hole 407, and a limiting plate 408, the sliding base 4 has a plurality of sliding grooves 401 on an upper surface thereof, the rolling ball 402 is respectively disposed inside the plurality of sliding grooves 401, the rolling ball 402 has a plurality of sets, the rolling ball 402 is uniformly distributed inside the rolling groove, the rotating shaft 406 penetrates through the rolling ball 402, the bearing seat 403 is disposed on the upper surface of the sliding base 4, the through hole 407 is disposed inside the bearing seat 403, the rotating shaft 406 is disposed inside the through hole 407, the first threaded hole 404 is disposed at a front end of the upper surface of the bearing seat 403 and a rear end of the upper surface of the bearing seat 403 respectively, the screw 405 is disposed inside the first threaded hole 404, the limiting plate 408 is disposed at a left end of the upper surface of the sliding base 4 and a right end of the upper surface of the sliding base 4, the bearing plate 7 is disposed above the sliding base 4, the bearing plate 7 is a movable mechanism, the rotating shaft 406 is a rotating mechanism, the rotating range of the rotating shaft 406 is disposed inside the bearing seat 403, and the bearing plate 7 slides on the rolling ball 402 above the sliding base 4, and the sliding ball 403 is used for supporting the sliding base 4 for supporting the rotating shaft 7.

Referring to fig. 1 or 7, the bearing plate 7 includes a fixing groove 701, scale marks 702, an adjusting groove 703 and a sliding groove 704, the adjusting groove 703 is disposed on each side of the bearing plate 7, the scale marks 702 are disposed on each of the left end of the upper surface of the bearing plate 7 and the right end of the upper surface of the bearing plate 7, the range of the scale marks 702 is 0mm-20mm, the sliding groove 704 is disposed at the bottom of the bearing plate 7, a plurality of fixing grooves 701 are uniformly distributed in the center of the upper surface of the bearing plate 7, the fixtures 6 are disposed on each of the left end of the upper surface of the bearing plate 7 and the right end of the upper surface of the bearing plate 7, and the fixing mechanisms 5 are disposed on each side of the bearing plate 7.

Referring to fig. 1, 3 or 4, the clamp 6 includes a first clamp plate 601, a second clamp plate 602, a third clamp plate 603, a fourth clamp plate 604, a fixing sleeve 605, a second threaded hole 606, an adjusting screw 607, a fixing circular groove 608 and an adjusting post 609, the first clamp plate 601 is disposed on the right side of the clamp 6, an arc groove 6011 is disposed on the right side of the first clamp plate 601, the second clamp plate 602 is disposed on the back side of the first clamp plate 601, a plurality of rubber posts 6021 are disposed on the back side of the second clamp plate 602, the third clamp plate 603 is disposed on the left side of the clamp 6, a rubber pad 6031 is disposed on the left side of the third clamp plate 603, the fourth clamp plate 604 is disposed on the front surface of the clamp 6, a rectangular groove 6041 is disposed on the front surface of the clamp 6, a circular through groove is disposed inside the clamp 6 and the fixing sleeve 605, an adjusting post 609 is disposed inside the circular through groove, fixed cover 605 front surface central point puts, fixed cover 605 right side surface central point puts, fixed cover 605 back central point puts and fixed cover 605 left side central point puts and is equipped with a second screw hole 606 respectively, it is equipped with fixed circular slot 608 to adjust post 609 front surface upper end, it is equipped with inserted block 6091 to adjust post 609 bottom, inserted block 6091 is equipped with two, two inserted blocks 6091 are located respectively and adjust post 609 bottom left end and adjust post 609 bottom right-hand member, in the in-service use process, press from both sides to get tubular object and cut through using first splint 601 clamp, press from both sides to get irregular shape object and cut through using second splint 602, press from both sides to get block object and cut through using third splint 603, press from both sides to get panel and cut through using fourth splint 604, through anchor clamps 6 that set up, realize the fixed to the needs cutting object of different shapes.

Referring to fig. 1, 5 or 6, the fixing mechanism 5 includes a support rod 501, a sleeve 502, a circular chute 503, a spring 504, a limit ring 505, a pull rod 506 and a clamping plate 507, the upper end of the support rod 501 is provided with the limit ring 505, the bottom of the sleeve 502 is provided with the circular chute 503, the interior of the sleeve 502 is provided with the spring 504, the interior of the circular chute 503 is provided with the support rod 501, the left side of the sleeve 502 is provided with a clamping plate, the bottom of the clamping plate is provided with a clamping tooth 5071, in the actual use process, the clamping tooth 5071 at the bottom of the clamping plate 507 is meshed with an adjusting clamping groove 703 above the bearing plate 7, so that the bearing plate 7 cannot move back and forth, and the fixing and the measurement of the moving distance of the bearing plate 7 are realized through the cooperation of the fixing mechanism 5, the scale 702 and the adjusting clamping groove 703.

As an embodiment of the present invention: in the actual use process, the clamp 6 on both sides of the bearing plate 7 is rotated, so that the clamp 6 is rotated outside the adjusting column 609, so that the adjusting screw 607 is inserted into the second threaded hole 606, the adjusting screw 607 is rotated to enter the second threaded hole 606, when a tubular object needs to be cut, the clamp 6 is rotated, the first clamp plates 601 on both sides of the bearing plate 7 are symmetrically arranged, the adjusting screw 607 is rotated, the adjusting screw 607 is fixed inside the circular fixing groove 608 in the adjusting column 609, the clamp 6 is fixed, the contact area with the tubular cutting object can be increased by arranging the arc-shaped groove 6011 on the first clamp plate 601, the same is achieved, because a plurality of rubber columns 6021 are arranged on the second clamp plate 602, the rubber columns 6021 are easily deformed by force, thereby each rubber column 6021 can be in surface contact with the irregular cutting object, thereby increasing the friction force when the clamping, the irregular-shaped object can be clamped by using the second clamp plate 602, because the rubber pads 6031 arranged on the third clamp plate 603 are arranged, by using the third clamp plate 603, the rectangular clamping groove 6031 can be clamped by using the rectangular clamping groove 6041, and the rectangular clamping groove 6041.

The insert 6091 of the bottom of the adjusting column 609 on the clamp 6 is inserted into the fixing clamp groove 701 at different positions, so that the positions of the left clamp 6 and the right clamp 6 are adjusted and fixed, and the cut object is clamped more stably by adjusting the positions of the two clamps 6.

In the actual use process, two electromagnets 8 are powered on, because the pull rod 506 at the top of the fixing mechanism 5 is made of metal materials, the pull rod 506 is moved upwards by magnetic force, the spring 504 is stressed and compressed, the top of the pull rod 506 is adsorbed at the bottom of the electromagnet 8, so that the clamping plate 507 can be separated from the clamping groove above the bearing plate 7, the bearing plate 7 can be moved back and forth at the moment, the effect of supporting the bearing plate 7 is achieved by the aid of the arranged rolling balls 402, resistance of the bearing plate 7 to move back and forth can be reduced, the limiting plate 408 moves inside the sliding groove 704 and plays a limiting role, so that the moving direction of the bearing plate 7 cannot deviate, the clamping and cutting material 6 is clamped and moved by the aid of the back and forth moving the bearing plate 7, the electromagnet 8 is powered off, the sleeve 502 on the fixing mechanism 5 is subjected to elastic force of the spring 504, the sleeve 502 drives the clamping plate 507 to move downwards, the clamping plate 507 is clamped inside the fixing clamping groove 701 on the bearing plate 7, so that the object can be cut in a subsection manner, positions of the cut objects are observed by the arranged scale lines 702 before and after the clamping plate 507 moves downwards, the objects move downwards by the control cylinder, the motor 306 to supply power, and the objects are cut at equal intervals.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims

1. The utility model provides an equidistance cutting control system, includes mount (1), cylinder (2), cutting mechanism (3), sliding bottom (4), fixed establishment (5), anchor clamps (6), loading board (7) and electro-magnet (8), its characterized in that: the cutting device is characterized in that an air cylinder (2) is arranged on the upper surface of the fixing frame (1), a cutting mechanism (3) is arranged at the bottom of the air cylinder (2), a bearing plate (7) is arranged below the cutting mechanism (3), a sliding base (4) is arranged below the bearing plate (7), fixing mechanisms (5) are arranged on two sides of the bearing plate (7), a clamp (6) is arranged above the bearing plate (7), an electromagnet (8) is arranged above the fixing mechanism (5), the cutting mechanism (3) comprises a driving belt pulley (301), a driven belt pulley (302), a synchronous belt (303), a rotating shaft (304), a tooth sheet (305) and a motor (306), the front end of an output shaft of the motor (306) is provided with the driving belt pulley (301), the synchronous belt (303) is arranged outside the driving belt pulley (301), a protective shell is arranged at the bottom of the air cylinder (2), the tooth sheet (305) is arranged inside the protective shell, a transmission shaft is arranged inside the tooth sheet (305), and the driven belt pulley (302) is arranged at the front end of the transmission shaft;

the fixture (6) comprises a first clamping plate (601), a second clamping plate (602), a third clamping plate (603), a fourth clamping plate (604), a fixing sleeve (605), a second threaded hole (606), an adjusting screw (607), a fixed circular groove (608) and an adjusting column (609), wherein the first clamping plate (601) is arranged on the right side of the fixture (6), an arc-shaped groove (6011) is arranged on the right side of the first clamping plate (601), the second clamping plate (602) is arranged on the back side of the first clamping plate (601), a plurality of rubber columns (6021) are arranged on the back side of the second clamping plate (602), the third clamping plate (603) is arranged on the left side of the fixture (6), a rubber pad (6031) is arranged on the left side of the third clamping plate (603), the fourth clamping plate (604) is arranged on the front surface of the fixture (6), a rectangular groove (6041) is arranged on the front surface of the fourth clamping plate (604), a fixing sleeve (605) is arranged on the upper surface of the fixture (6), a circular through groove (609) is arranged inside the fixture (6) and a circular through groove (609), a central position of the central surface of the front surface (605, a central position of the central hole (605) of the right clamping sleeve (605) and a central position of the central threaded hole (606) of the central hole (606) are arranged on the left side of the central hole (606) respectively, adjust post (609) front surface upper end and be equipped with fixed circular slot (608), it is equipped with inserted block (6091) to adjust post (609) bottom, inserted block (6091) is equipped with two, two inserted block (6091) are located respectively and adjust post (609) bottom left end and adjust post (609) bottom right-hand member, and in the in-service use process, press from both sides through using first splint (601) and get the tubular object and cut, press from both sides through using second splint (602) and get irregular shape object and cut, press from both sides through using third splint (603) and get the massive object and cut, press from both sides through using fourth splint (604) and get panel and cut.

2. An isometric cutting control system according to claim 1, wherein: the sliding base (4) comprises sliding grooves (401), rolling balls (402), bearing seats (403), first threaded holes (404), screws (405), rotating shafts (406), through holes (407) and limiting plates (408), the upper surface of the sliding base (4) is provided with a plurality of sliding grooves (401), the rolling balls (402) are arranged in the sliding grooves (401), the rolling balls (402) are provided with a plurality of groups, the rolling balls (402) are uniformly distributed in the rolling grooves, the rotating shafts (406) penetrate through the rolling balls (402), the bearing seats (403) are arranged on the upper surface of the sliding base (4), the through holes (407) are arranged in the bearing seats (403), the rotating shafts (406) are arranged in the through holes (407), the first threaded holes (404) are arranged at the front ends of the upper surface of the bearing seats (403) and the rear ends of the upper surface of the bearing seats (403), the screws (405) are arranged in the first threaded holes (404), the left end of the upper surface of the sliding base (4) and the upper surface of the sliding base (4) are respectively provided with the right end of the sliding base (408), the sliding base (4) and the rotating bearing plate (7) is arranged above the rotating mechanism, and the rotating shaft (406) is arranged in the range of the rotating mechanism (406), in the actual use process, the bearing plate (7) slides on the rolling ball (402) above the sliding base (4), and the rolling ball (402) rotates inside the bearing seat (403) through the rotating shaft (406).

3. An isometric cutting control system according to claim 2, wherein: the bearing plate (7) comprises a fixed clamping groove (701), scale marks (702), an adjusting clamping groove (703) and a sliding groove (704), the adjusting clamping groove (703) is arranged on two sides of the bearing plate (7) respectively, the left end of the upper surface of the bearing plate (7) and the right end of the upper surface of the bearing plate (7) are respectively provided with the scale marks (702), the measuring range of the scale marks (702) is 0mm-20mm, the sliding groove (704) is arranged at the bottom of the bearing plate (7), a plurality of fixed clamping grooves (701) are uniformly distributed on the center of the upper surface of the bearing plate (7), clamps (6) are arranged on the left end of the upper side of the bearing plate (7) and the right end of the upper surface of the bearing plate (7) respectively, the two sides of the bearing plate (7) are respectively provided with a fixing mechanism (5), and the clamps (6) are clamped into the fixed clamping grooves (701) at different positions in the actual use process, so that the distance between the two clamps (6) is changed.

4. An isometric cutting control system according to claim 3, wherein: fixing mechanism (5) are including bracing piece (501), sleeve pipe (502), circular spout (503), spring (504), spacing ring (505), pull rod (506) and cardboard (507), bracing piece (501) upper end is equipped with spacing ring (505), sleeve pipe (502) bottom is equipped with circular spout (503), sleeve pipe (502) inside is equipped with spring (504), inside bracing piece (501) that is equipped with of circular spout (503), sleeve pipe (502) left side is equipped with the splint, the splint bottom is equipped with latch (5071), and in the in-service use in-process, latch (5071) of cardboard (507) bottom and regulation draw-in groove (703) intermeshing above loading board (7) make unable back-and-forth movement of loading board (7).