CN213084915U

CN213084915U - Cloth stretching machine for tarpaulin processing

Info

Publication number: CN213084915U
Application number: CN202021822007.9U
Authority: CN
Inventors: 郝文波
Original assignee: Qingdao Xinruide Machinery Equipment Co ltd
Current assignee: Qingdao Xinruide Machinery Equipment Co ltd
Priority date: 2020-08-26
Filing date: 2020-08-26
Publication date: 2021-04-30
Anticipated expiration: 2030-08-26

Abstract

The utility model discloses a tarpaulin machine of stretching of tarpaulin processing usefulness, including braced frame, still include upper strut frame and bottom suspension strut, have at least one support frame in upper strut frame and the bottom suspension strut frame and can reciprocate along braced frame vertical direction, rotatably erect the upper support roller on the upper strut frame, rotatably erect the bottom suspension strut on the bottom suspension strut frame, the tarpaulin passes lower support roller and upper support roller by one side along vertical interval in proper order, the utility model discloses a tarpaulin machine of stretching for tarpaulin processing can adjust the elasticity of the tarpaulin of preorder feed equipment conveying in order to keep the stability and the planarization of the tarpaulin of conveying to follow-up processing equipment, has satisfied the precision of follow-up tarpaulin processing, improves the quality of tarpaulin follow-up processing, reduces the defective percentage; meanwhile, certain reaction time can be reserved for operation workers when the feeding equipment is blocked or other accidents happen, further damage to the equipment is prevented to a certain extent, and production cost is saved for enterprises.

Description

Cloth stretching machine for tarpaulin processing

Technical Field

The utility model relates to a tarpaulin production technical field especially relates to a cloth stretcher of tarpaulin processing usefulness.

Background

Can involve a series of processes such as feed, tailorring in the tarpaulin production process, the tarpaulin feed is generally to be twined the material roller that remains to process the tarpaulin and set up on last work or material rest, draws forth the tarpaulin from the material roller through the drive mechanism of subsequent processing procedure.

In the tarpaulin processing process in the prior art, tarpaulin is pulled off from a material roller by a traction mechanism and then enters a subsequent processing procedure, but when the tarpaulin is released too much from the material roller and the material roller cannot be rewound due to special reasons, the tarpaulin transmitted to the subsequent processing procedure is the tarpaulin in a loose state, and the processing precision cannot be ensured in the subsequent processing procedure; or when the feeding mechanism is suddenly locked due to accident or the feeding speed is suddenly reduced, the operation workers can not ensure the quality of subsequent tarpaulin processing if the reaction is not timely, and even more serious damage to the equipment can be caused.

SUMMERY OF THE UTILITY MODEL

The utility model discloses a tarpaulin stretcher for tarpaulin processing, which comprises a supporting frame, wherein the supporting frame comprises two upper cross beams, two lower cross beams, two upper longitudinal beams, two lower longitudinal beams, four vertical beams, an upper supporting frame and a lower supporting frame, at least one supporting frame in the upper supporting frame and the lower supporting frame can move up and down along the vertical beams, the upper supporting frame is rotatably provided with n upper supporting rollers which are arranged in parallel with the upper cross beams, the lower supporting frame is rotatably provided with m lower supporting rollers which are arranged in parallel with the upper supporting rollers, wherein n is more than or equal to 1, m is more than or equal to n +1 or m is more than or equal to 1, n is more than or equal to m +1, n is more than or equal to m, and n is more than or equal to m the projections of the upper supporting rollers and m of the lower supporting rollers on the horizontal plane are arranged in a staggered way, the tarpaulin is by one side along longeron direction interval pass m in proper order the lower support roller with n go up the supporting roller, still be provided with on the braced frame and be used for the drive go up the support frame and/or the lower carriage is followed upper portion crossbeam reciprocates in order to stretch tightly the actuating mechanism of tarpaulin.

As an alternative of the technology of the utility model, every two vertical beams are provided with sliding grooves along the longitudinal opposite surfaces, the two outer sides of the upper support frame and the lower support frame are both fixedly connected with fixed shafts near the two ends of the sliding chute, the fixed shafts are rotatably sleeved with traveling wheels which can roll in the sliding grooves, at least one first connecting plate is arranged on the two outer sides of the upper longitudinal beam and the lower longitudinal beam, the first connecting plates on the two outer sides of the lower longitudinal beam are respectively hinged with a first air cylinder, the telescopic shafts of the first air cylinders are respectively arranged upwards, at least one second connecting plate is arranged at the position of the two outer sides of the upper supporting frame and the lower supporting frame corresponding to the first connecting plate, the tail ends of the telescopic shafts of the first air cylinders are hinged with the second connecting plates on the two outer sides of the upper support frame; the first connecting plates on the two outer sides of the upper longitudinal beam are hinged with second cylinders, telescopic shafts of the second cylinders are arranged downwards, and the tail ends of the telescopic shafts of the second cylinders are hinged with the second connecting plates on the two outer sides of the lower support frame.

As an alternative of the technology of the present invention, the number of the first connecting plates at each outer side of the upper longitudinal beam is two, and the number of the first connecting plates corresponding to each side and the number of the second connecting plates on the lower supporting frame are two; the number of the first connecting plates on each side of the lower longitudinal beam is two, and the number of the second connecting plates on the second cylinder and the upper support frame corresponding to each side is two.

As an alternative of the technology of the utility model, each two vertical beams are provided with a sliding groove along the longitudinal opposite surface, the outer side of each side of the upper support frame and the lower support frame is close to the two ends of the sliding groove and is fixedly connected with a fixed shaft respectively, the fixed shaft is rotatably sleeved with a walking wheel which can roll in the sliding groove, the outer side of each side of the upper longitudinal beam is provided with at least one first connecting plate, the first connecting plate is hinged with a second cylinder, the telescopic shaft of the second cylinder is arranged downwards, the outer side of each side of the lower support frame is provided with at least one second connecting plate corresponding to the first connecting plate, the end of the telescopic shaft of the second cylinder is hinged with the second connecting plate, the upper parts of the two sides of the upper support frame close to the upper longitudinal beam are provided with at least one first adjusting plate, the lower carriage is close to both sides upper portion of lower part longeron all is provided with at least one second adjusting plate, still can rotatably erect on the longeron of upper portion at least one with upper portion crossbeam parallel arrangement's first connecting rod, the both ends of first connecting rod all are provided with first sprocket, first adjusting plate with the second adjusting plate passes through the open-loop chain and connects, the open-loop chain with first sprocket meshing.

As the utility model discloses technical an alternative, every side first adjusting plate with the number of second adjusting plate is two, corresponds the number of first connecting rod is two, every side first sprocket with the number of ring-opening chain is two.

As the utility model discloses technical an alternative, one of them be provided with the second sprocket on the first connecting rod, another first gear has been cup jointed on the first connecting rod, two still be provided with supporting beam between the longeron of upper portion, supporting beam and one of them the second connecting rod has been erect to rotatable ground between the longeron of upper portion, second gear and third sprocket have been cup jointed on the second connecting rod, the second gear with first gear engagement, the third sprocket with connect through closed loop chain drive between the second sprocket.

As the utility model discloses technical an alternative, per two all rotationally be provided with an auxiliary roller between the upright beam, the auxiliary roller sets up and is corresponding the upper portion crossbeam with between the lower part crossbeam and with upper portion crossbeam parallel arrangement.

The utility model has the advantages that:

the utility model discloses a stretch cloth machine for tarpaulin processing can adjust the elasticity of the tarpaulin that preorder feeder equipment conveyed in order to keep the stability and the planarization of the tarpaulin that reaches follow-up processing equipment, has satisfied the precision of follow-up tarpaulin processing, improves the quality of the follow-up processing of tarpaulin, reduces the defective percentage; meanwhile, certain reaction time can be reserved for operation workers when the feeding equipment is blocked or other accidents happen, further damage to the equipment is prevented to a certain extent, and production cost is saved for enterprises. The utility model discloses a tarpaulin processing is with stretching cloth machine also can be used to other flexible coiled materials, for example in the production process of cotton soft piece of cloth, coiled material etc. equally can improve the processingquality who corresponds the product.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments 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 it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive labor.

Fig. 1 is a schematic structural diagram of embodiment 1 of the present invention.

Fig. 2 is a schematic structural diagram of embodiment 2 of the present invention.

Fig. 3 is a partially enlarged view of a portion a in fig. 2.

Reference numerals:

10-a support frame; 11-upper cross beam; 12-a lower cross beam; 13-upper stringers; 131-a first connection plate; 14-lower stringer; 15-erecting a beam; 151-a chute; 16-a support beam; 17-an auxiliary roll; 21-upper support frame; 211-upper support rollers; 213-road wheels; 214-a second connecting plate; 22-lower support frame; 221-lower support roll; 231-a first cylinder; 232-a second cylinder; 31-a first link; 311-a first sprocket; 312 — a second sprocket; 313-a first gear; 32-open loop chain; 33-a second link; 331-a second gear; 332-a third sprocket; 34-a closed loop chain; and 40-tarpaulin.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments.

It should be noted that all the directional indicators (such as upper, lower, left, right, front and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indicator is changed accordingly.

In the description of the embodiments, the terms "disposed," "connected," and the like are to be construed broadly unless otherwise explicitly specified or limited. For example, the connection can be fixed, detachable or integrated; can be mechanically or electrically connected; either directly or through an intervening medium, or through internal communication between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In addition, the descriptions related to "first", "second", etc. in the present invention are for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicit ly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

As shown in fig. 1-3, the utility model discloses a tarpaulin stretching machine for tarpaulin processing, which comprises a supporting frame 10, wherein the supporting frame comprises two upper cross beams 11, two lower cross beams 12, two upper longitudinal beams 13, two lower longitudinal beams 14, four vertical beams 15, an upper supporting frame 21 and a lower supporting frame 22, at least one of the upper supporting frame 21 and the lower supporting frame 22 can move up and down along the vertical beams 15, n upper supporting rollers 211 parallel to the upper cross beams 11 are rotatably erected on the upper supporting frame 21, m lower supporting rollers 221 parallel to the upper supporting rollers 211 are rotatably erected on the lower supporting frame 22, wherein n is not less than 1, m +1 or m is not less than 1, n + m +1, n is m +1, the projections of the n upper supporting rollers 211 and the m lower supporting rollers 221 on the horizontal plane are staggered, the tarpaulin 40 sequentially passes through the m lower supporting rollers 221 and the n upper supporting rollers 211 along the longitudinal beam direction from one side, the support frame 10 is further provided with a driving mechanism for driving the upper support frame 21 and/or the lower support frame 22 to move up and down along the cross beam to stretch the tarpaulin.

Generally, in the actual use process, a feeding mechanism is arranged in the front of the beat of the cloth stretcher, a cutting or other processes are further arranged in the follow-up process of the cloth stretcher, a traction mechanism is generally arranged in the follow-up work, the tarpaulin 40 between the feeding mechanism and the follow-up processing process is stretched tightly through the upper supporting roller 211 and the lower supporting roller 221, the follow-up processing process is convenient to carry out, for example, cutting or other processes with requirements on feeding precision are ensured, when the feeding mechanism supplies redundant tarpaulin and cannot be rewound, the upper supporting frame 21 and/or the lower supporting frame 22 can be driven to be away from each other through the driving mechanism to increase the distance between the upper supporting frame 21 and the lower supporting frame 22, and the tarpaulin 40 wound between the upper supporting roller 211 and the lower supporting roller 221 is stretched tightly, so that the tarpaulin 40 is transmitted to the follow-up processing process; when the feeding mechanism is suddenly locked due to accident or the feeding speed is suddenly reduced, the upper support frame 21 and/or the lower support frame 22 are driven by the driving mechanism to approach each other to reduce the distance between the upper support frame 21 and the lower support frame 22, and part of the tarpaulin 40 wound between the upper support roller 211 and the lower support roller 221 is slowly released to meet the subsequent processing requirement and leave for a certain reaction time of workers, so that the equipment is prevented from being seriously damaged due to untimely reaction, and meanwhile, the processing quality of the tarpaulin is also ensured.

The driving mechanism can only drive the upper support frame 21 or the lower support frame 22, and also can drive the upper support frame 21 and the lower support frame 22 at the same time, the tarpaulin 40 wound on the upper support roller 211 and the lower support roller 221 can be stretched tightly only by increasing the distance in the height direction of the upper support frame 21 and the lower support frame 22, and the tarpaulin 40 wound on the upper support roller 211 and the lower support roller 221 can be released only by reducing the distance in the height direction of the upper support frame 21 and the lower support frame 22. While there are a number of different embodiments of the upper and lower support frames 22 that can be driven simultaneously, two preferred embodiments are described below to facilitate an understanding of the present invention.

In the case of the example 1, the following examples are given,

as shown in fig. 1, in this embodiment, the driving mechanism is a first cylinder 231 and a second cylinder 232, the number n of the upper support rollers is 4, the number m of the lower support rollers is 3, each two vertical beams 15 are provided with a sliding groove 151 on the longitudinal opposite surface, fixed shafts are fixedly connected to two ends of two outer sides of the upper support frame 21 and the lower support frame 22 close to the sliding groove 151, a traveling wheel 213 is rotatably sleeved on each fixed shaft, the traveling wheel 213 can roll in the sliding groove 151, at least one first connecting plate 131 is arranged on two outer sides of the upper longitudinal beam 13 and the lower longitudinal beam 14, the first cylinder 231 is hinged on the first connecting plate 131 on two outer sides of the lower longitudinal beam 14, the telescopic shaft of the first cylinder 231 is arranged upward, at least one second connecting plate 214 is arranged at a position corresponding to the first connecting plate 131 on two outer sides of the upper support frame 21 and the lower support frame 22, and the tail end of the telescopic shaft of the first cylinder 231 is hinged to the second connecting plate 214 on two outer sides of the upper; the first connecting plates 131 on two outer sides of the upper longitudinal beam 13 are hinged with second cylinders 232, telescopic shafts of the second cylinders 232 are arranged downwards, and the tail ends of the telescopic shafts of the second cylinders 232 are hinged with the second connecting plates 214 on two outer sides of the lower support frame 22. In the scheme, the first air cylinder 231 drives the upper support frame 21 to move up and down, and the second air cylinder 232 drives the lower support frame 22 to move up and down, so that the purpose of increasing or reducing the distance between the upper support frame 21 and the lower support frame 22 can be achieved. Of course, the first cylinder 231 and the second cylinder 232 may be operated separately or simultaneously.

In the above solution, the functions can be achieved by respectively providing at least one first cylinder 231 and at least one second cylinder 232 on the left and right sides of the support frame 10, as a preferable solution, the number of the first connecting plates 131 on each outer side of the upper longitudinal beam 13 is two, and the number of the first cylinders 231 and the second connecting plates 214 on the lower support frame 22 corresponding to each side is two; the number of the first connecting plates 131 on each side of the lower longitudinal beam 14 is two, and the number of the second connecting plates 214 on the second cylinder 232 and the upper support frame 21 corresponding to each side is two. The number of the first cylinder 231 and the second cylinder 232 on one side is two in the scheme, and the stability of the upper support frame 21 and/or the lower support frame in the up-down moving process can be ensured through the arrangement.

In the case of the example 2, the following examples are given,

as shown in fig. 2-3, in this embodiment, the driving mechanism is a second cylinder and sprocket chain transmission mechanism, the number n of the upper support rollers is 3, the number m of the lower support rollers is 4, each two vertical beams 15 are provided with a sliding groove 151 on longitudinal opposite surfaces, fixed shafts are fixedly connected to two ends of the outer sides of each side of the upper support frame 21 and the lower support frame 22 close to the sliding groove 151 respectively, a walking wheel 213 is rotatably sleeved on each fixed shaft, the walking wheel 213 can roll in the sliding groove 151, at least one first connecting plate 131 is arranged on the outer side of each side of the upper longitudinal beam 13, a second cylinder 232 is hinged on the first connecting plate 131, the telescopic shaft of the second cylinder 232 is arranged downward, at least one second connecting plate 214 is arranged on the outer side of each side of the lower support frame 22 corresponding to the first connecting plate 131, the end of the telescopic shaft of the second cylinder 232 is hinged to the second connecting plate 214, the upper support frame 21 is provided with at least one first adjusting plate on the upper portions of two sides close to the upper longitudinal beam 13, the lower support frame 22 is provided with at least one second adjusting plate on the upper portions of two sides close to the lower longitudinal beam 14, the two upper longitudinal beams 13 are also rotatably provided with at least one first connecting rod 31 parallel to the upper cross beam 11, the two ends of the first connecting rod 31 are provided with first chain wheels 311, the first adjusting plate and the second adjusting plate are connected through an open-loop chain 32, and the open-loop chain 32 is meshed with the first chain wheels 311. The lower support frame 22 can be driven to move up and down by arranging the second air cylinder, and because the lower support frame 22 and the upper support frame 21 are connected through the open-loop chain 32 and the length of the open-loop chain 32 is fixed, in the process that the lower support frame 22 moves up, the upper support frame 21 descends through the transmission of the open-loop chain 32 and the first gear 311, so that the distance between the upper support frame 21 and the lower support frame 22 can be reduced, and the tarpaulin between the upper support roller 211 and the lower support roller 221 can be released; on the contrary, when the second cylinder 232 drives the lower supporting frame 22 to move downwards, the upper supporting frame 21 moves upwards synchronously, and the tarpaulin 40 can be stretched tightly.

As in embodiment 1, the above function can be achieved by providing at least one second cylinder 232 and at least one set of chain wheel and chain transmission mechanism on each of the left and right sides of the supporting frame 10, and preferably, the number of the first adjusting plates and the second adjusting plates on each side is two, corresponding to the number of the first links 31, and the number of the first chain wheels 311 and the open-loop chains 32 on each side is two. By this arrangement, the stability of the upper support frame 21 and the lower support frame 22 during the up-and-down movement can be ensured.

Preferably, one of the first links 31 is provided with a second sprocket 312, the other first link 31 is sleeved with a first gear 313, a supporting beam 16 is further arranged between the two upper longitudinal beams 13, a second link 33 is rotatably erected between the supporting beam 16 and one of the upper longitudinal beams 13, the second link 33 is sleeved with a second gear 331 and a third sprocket 332, the second gear 331 is engaged with the first gear 313, and the third sprocket 332 is in transmission connection with the second sprocket 312 through a closed-loop chain 34. The arrangement ensures the synchronism between the transmission of the two open-loop chains 32 and the corresponding first chain wheels 311 on the same side, and further increases the stability and balance of the upper support frame 21 and the lower support 22 in the process of moving up and down.

In the above two embodiments, an auxiliary roller 17 is rotatably disposed between each two vertical beams 15, the auxiliary roller 17 is disposed between the corresponding upper cross beam 11 and the corresponding lower cross beam 12 and parallel to the upper cross beam 11, and the arrangement of the auxiliary roller 17 can further ensure the smoothness of the tarpaulin 40 during the transportation process.

The above steps can be fully automatically controlled by an external control system, such as a PLC control system, and this control method is a method already known by those skilled in the art and will not be described herein again.

The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention. In addition, the technical solutions between the various embodiments can be combined with each other, but must be based on the realization of those skilled in the art; when the technical solutions are contradictory or cannot be combined, the combination of the technical solutions should be considered to be absent, and is not within the protection scope of the present invention.

Claims

1. A cloth stretching machine for processing tarpaulin comprises a supporting frame, wherein the supporting frame comprises two upper cross beams, two lower cross beams, two upper longitudinal beams, two lower longitudinal beams and four vertical beams, and is characterized by further comprising an upper supporting frame and a lower supporting frame, at least one of the upper supporting frame and the lower supporting frame can move up and down along the vertical beams, n upper supporting rollers parallel to the upper cross beams are rotatably erected on the upper supporting frame, m lower supporting rollers parallel to the upper supporting rollers are rotatably erected on the lower supporting frame, n is more than or equal to 1, m is more than or equal to n +1 or m is more than or equal to 1, n is more than or equal to m +1, the projections of the upper supporting rollers and the m lower supporting rollers on the horizontal plane are staggered, and the tarpaulin sequentially penetrates through the m lower supporting rollers and the n upper supporting rollers from one side along the longitudinal beam direction, the supporting frame is further provided with a driving mechanism for driving the upper supporting frame and/or the lower supporting frame to move up and down along the upper cross beam so as to stretch the tarpaulin tightly.

2. The cloth stretcher for tarpaulin processing as claimed in claim 1, wherein each two of said vertical beams are provided with sliding grooves on the opposite surfaces thereof in the longitudinal direction, the two outer sides of the upper support frame and the lower support frame are both fixedly connected with fixed shafts near the two ends of the sliding chute, the fixed shafts are rotatably sleeved with traveling wheels which can roll in the sliding grooves, at least one first connecting plate is arranged on the two outer sides of the upper longitudinal beam and the lower longitudinal beam, the first connecting plates on the two outer sides of the lower longitudinal beam are respectively hinged with a first air cylinder, the telescopic shafts of the first air cylinders are respectively arranged upwards, at least one second connecting plate is arranged at the position of the two outer sides of the upper supporting frame and the lower supporting frame corresponding to the first connecting plate, the tail ends of the telescopic shafts of the first air cylinders are hinged with the second connecting plates on the two outer sides of the upper support frame; the first connecting plates on the two outer sides of the upper longitudinal beam are hinged with second cylinders, telescopic shafts of the second cylinders are arranged downwards, and the tail ends of the telescopic shafts of the second cylinders are hinged with the second connecting plates on the two outer sides of the lower support frame.

3. The cloth stretcher for processing tarpaulin according to claim 2, wherein the number of the first connecting plates at each outer side of the upper longitudinal beam is two, and the number of the first cylinder corresponding to each side and the number of the second connecting plates on the lower support frame are two; the number of the first connecting plates on each side of the lower longitudinal beam is two, and the number of the second connecting plates on the second cylinder and the upper support frame corresponding to each side is two.

4. The cloth stretcher for processing tarpaulin according to claim 1, wherein each two vertical beams are provided with a sliding groove along the longitudinal opposite surface, the outer side of each side of the upper support frame and the lower support frame near the two ends of the sliding groove are respectively and fixedly connected with a fixed shaft, the fixed shaft is rotatably sleeved with a walking wheel, the walking wheel can roll in the sliding groove, the outer side of each side of the upper longitudinal beam is provided with at least one first connecting plate, the first connecting plate is hinged with a second cylinder, the telescopic shaft of the second cylinder is arranged downwards, the outer side of each side of the lower support frame is provided with at least one second connecting plate corresponding to the first connecting plate, the tail end of the telescopic shaft of the second cylinder is hinged with the second connecting plate, the upper parts of the two sides of the upper support frame near the upper longitudinal beam are provided with at least one first adjusting plate, the lower carriage is close to both sides upper portion of lower part longeron all is provided with at least one second adjusting plate, still can rotatably erect on the longeron of upper portion at least one with upper portion crossbeam parallel arrangement's first connecting rod, the both ends of first connecting rod all are provided with first sprocket, first adjusting plate with the second adjusting plate passes through the open-loop chain and connects, the open-loop chain with first sprocket meshing.

5. The cloth stretcher for tarpaulin processing of claim 4, wherein the number of the first adjusting plate and the second adjusting plate on each side is two, the number of the corresponding first connecting rods is two, and the number of the first chain wheel and the open-loop chain on each side is two.

6. The cloth stretcher for processing tarpaulin according to claim 5, wherein a second sprocket is provided on one of the first connecting rods, a first gear is sleeved on the other first connecting rod, a supporting beam is further provided between the two upper longitudinal beams, a second connecting rod is rotatably erected between the supporting beam and one of the upper longitudinal beams, a second gear and a third sprocket are sleeved on the second connecting rod, the second gear is engaged with the first gear, and the third sprocket is connected with the second sprocket through a closed-loop chain transmission.

7. A cloth stretcher for tarpaulin processing according to any of claims 1 to 6 wherein an auxiliary roller is rotatably provided between each two of said vertical beams, said auxiliary roller being provided between said upper cross member and said lower cross member and being parallel to said upper cross member.