GB1581378A - Sheet straightening machine - Google Patents
Sheet straightening machine Download PDFInfo
- Publication number
- GB1581378A GB1581378A GB5199477A GB5199477A GB1581378A GB 1581378 A GB1581378 A GB 1581378A GB 5199477 A GB5199477 A GB 5199477A GB 5199477 A GB5199477 A GB 5199477A GB 1581378 A GB1581378 A GB 1581378A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pressure
- piston
- electrical signal
- gap
- inlet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D—WORKING OR PROCESSING OF SHEET METAL OR METAL TUBES, RODS OR PROFILES WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21D1/00—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling
- B21D1/02—Straightening, restoring form or removing local distortions of sheet metal or specific articles made therefrom; Stretching sheet metal combined with rolling by rollers
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Straightening Metal Sheet-Like Bodies (AREA)
- Delivering By Means Of Belts And Rollers (AREA)
- Control Of Metal Rolling (AREA)
Abstract
The adjusting device for the levelling gap of a sheet levelling machine with an upper roller frame (A) and a lower roller frame (B), which, leaving free the levelling gap, is equipped with levelling rollers (1 to 10) spaced apart and arranged transversely to the feed direction of the sheet material (C) to be levelled, the upper roller frame (A) and the lower roller frame (B) being displaceable relative to one another, transversely to the feed direction of the material, in order to adjust the levelling gap, has pairs of hydraulically displaceable piston rods (F1 and F2 respectively) at the sheet inlet and at the sheet outlet as tensile elements for the adjustment of the levelling gap. Each piston rod (F1 and F2 respectively) is guided in the upper roller frame (A) in the guide bore of a cylinder space (K1 and K2 respectively) which is divided, by a piston (E1 and E2 respectively) connected to the piston rod, into two annular spaces (K1x, K2x and K1y, K2y respectively), of which the upper annular space in each case has a smaller operative cross-section on the piston than the lower annular space in each case. The upper annular space in each case is connected directly to an adjustable pressure-medium source (S) while the lower annular space in each case is likewise connected to the pressure-medium source, via a servo pressure-reducing valve (O1 and O2 respectively). The invention makes possible automatic and, if required, remote-controlled adjustment of the levelling machine without readjustment during the levelling process. <IMAGE>
Description
(54) SHEET STRAIGHTENING MACHINE
(71) We, HORST ZERHOCH VOR
RICHTUNGS- UND MASCHINENBAU
G.m.b.H. & Co. K.G., a German Kommanditgesellschaft, of Am Tiefen Weg, 7573 Sinzheim, Federal Republic of Germany, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:
The subject of the invention is a straightening machine for straightening sheet metal and flat material, with a lower and an upper roller frame, which each accommodate upper or lower forcibly-driven straightening rollers respectively, these rollers being arranged at a distance from each other and transverse to the direction in which the material passes through, the straightening rollers of the upper roller frame being arranged in the interstices between those of the lower roller frame.
In straightening machines of the said type, the spatial relationship between the upper and the lower roller frame, i.e. the setting of the straightening gap between the straightening rollers, can be effected. for example, via spindles operated by means of a hand wheel, and the setting values are monitored by measurement gauges or similar mechanical measuring devices. The setting of these straightening machines is relatively complicated and once they are set they are unable to adapt themselves to the different properties of the materials.
The invention is therefore based on the task of improving a straightening machine of the above-mentioned design so that it is possible to set the machine automatically and, if required, remotely, without intermediate controls or re-adjustment for small deviations in the material being necessary.
In addition, re-adjustment and measuring for each batch of material run through should also be eliminated.
According to the invention there is provided a machine for straightening sheet metal or other flat material comprising a material inlet and material outlet defining a path of material flow; an upper roller frame disposed between said inlet and outlet along said path, said upper roller frame housing a first plurality of forcibly driven parallel straightening rollers disposed along said path and transverse with respect thereto; a lower roller frame disposed between said inlet and outlet along said path, said lower roller frame housing a second plurality of forcibly driven parallel straightening rollers disposed along said path and transverse with respect thereto, the axes of said second plurality of straightening rollers being arranged in vertical planes which are parallel with and between vertical planes in which the axes of the first plurality of straightening rollers lie; at least one pair of pressure medium operated piston assemblies for causing relative movement between said first and second frames and for locking said frames at predetermined relative positions, a first assembly of said pair interconnecting said upper and lower frames in the vicinity of said inlet, and a second assembly of said pair interconnecting said upper and lower frames in the vicinity of said outlet, each of said piston assemblies comprising a cylinder chamber contained in one of said upper and lower frames, a piston reciprocating in said chamber which divides said chamber into an upper and lower annular chamber, said upper annular chamber of each piston assembly having a smaller effective cross-sectional area than a respective said lower annular chamber, a guide bore provided in said cylinder chamber, a piston rod having one end coupled to said piston and another end projecting through said guide bore and coupled to the other of said upper and lower frames, and means for directly connecting each of the upper annu lar chambers of said piston assemblies with an adjustable pressure medium source and each of said lower annular chambers of said piston assemblies to the output of a servocontrolled pressure reducing valve supplying a pressure medium from a source.
By having upper and lower annular chambers of different effective cross-sectional areas, the same pressure in the annular chamber above the piston and below the piston causes the whole piston rod to be drawn upwards due to the greater effective cross-section of the lower annular chamber, and thus effects the relative positioning between the upper roller frame and the lower roller frame.
Preferably, there is provided a pair of said piston assemblies in the vicinity of said inlet and a pair of said piston assemblies is provided in the vicinity of said outlet, each of said piston assemblies having its respective upper annular chamber connected directly to said pressure medium source, each piston assembly of said inlet pair having its lower annular chamber connected to the output of a first servo controlled pressured reducing valve, and each piston assembly of said outlet pair having its lower annular chamber connected to the output of a second servo controlled pressure-reducing valve. In such a case there may be provided a seperate control circuit for each of said first and second servo controlled pressurereducing valves, each of said control circuits comprising: means for sensing the pressure of the pressure medium in the lower annular chamber of at least one of the respective pairs of piston assemblies associated with a servo controlled pressure-reducing valve, and for providing a first electrical signal representative of said sensed pressure; means for setting a desired pressure level, and for forming a second electrical signal representative of said desired pressure; first means for comparing said first and second electrical signals for providing a third electrical signal representing the difference between said desired and sensed pressure levels; and means for applying said third electrical signal to a control input of said associated servo controlled pressurereducing valve. Such an arrangement provides independently controlled adjustment of the piston assemblies at the inlet and outlet. Preferably means for setting each control circuit is located remotely from said respective first and second servo controlled pressure-reducing valves.
In a further development, in an advantageous construction form, provision is also made for the machine to be provided with regulator means for presetting said control circuits with a desired value of material thickness. As a certain kind of machine also has a minimum measurement for the material thickness which it is still possible to treat, to define the lower limit to which the desired value can be set there is a stop which becomes operative when the setting of the desired value lies on the material's lower limit, and the actual value exceeds the lower dimension for the thickness of the material which can still be treated.
The invention and advantageous details will be described more fully with reference to the Drawing, which shows one construction form by way of example.
As can be seen from the Drawing, a straightening machine of the kind described above has an upper roller from A with forcibly driven straightening rollers 1,3,5,7 ... and a lower roller frame B with lower driven straightening rollers 2,4,6,8,10
The axes of the lower rollers are arranged in vertical planes which are parallel with and between vertical planes in which the axes of the upper rollers lie. The construction of the two roller frames and the drive, bracing, mounting and arrangement of the straightening rollers, etc. are not the subject of the invention, with the exception of the connecting and adjusting element between the upper and the lower roller frame, together with the operation and regulating elements associated with these relative adjustment elements. The gap between the straightening rollers 1,3,5,7 ... of the upper roller frame and the straightening rollers 2,4,6,8,10 of the lower roller frame can be adjusted, i.e. to the material thickness of a material C to be straightened which is passed through between these rows of rollers in the direction of the arrow a, in a manner which is described in more detail below.
As has already been generally indicated above, the relative adjustment between the upper and the lower roller frame is carried out by means of a total of four pistons, arranged in two pairs, one at the inlet for the material to be straightened and one at the outlet for the material to be straightened, and in the schematic longitudinal section only one from each pair is shown, namely, one piston rod F, at the inlet for the material to be straightened, and one piston rod F, at the outlet for the material to be straightened. The piston rods F1, F2 project into an associated cylinder chamber K1 or
K2 respectively in the upper roller frame, and are rigidly connected to a piston E1 or E, which can be moved in the relevant cylinder chamber K1 or K2 respectively, and which is transformed on the opposite side to a piston rod section D1 or D2 respectively.
The piston rods F, or F2 and the piston rod sections D, and D7 are passed leak-tight to pressure medium through the end walls of the cylinder chambers K, and K2 respectively. As shown, the thrust piston rods Fl and
F2 have a smaller diameter than the upper sections Dl and D2 of the piston rods which are connected to the pistons E1 and E2 respectively, so that in the annular chamber section K K which lies below the piston
El, E2 in the cylinder chamber K,, K2 there is a greater effective cross-section at the movable piston E " E2 for a pressure medium than in the annular chambers K,x, K2x which lie above the pistons Et, E2, due to the greater diameter of the piston rod parts DI, D2. In other words: If the upper annular chambers Kix, K2x and the lower annular chambers K K are loaded with the same pressure, then the pistons E1, E2 move upwards in the cylinder chambers Kl, K2 and thus draw up the lower roller frame
B and force the upper roller frame A down.
The upper annular chambers Kix, K2x are supplied with pressure medium from a pressure medium source S via a branching point P1 or P2 respectively. The lower annular chambers Kiy, K2y on the other hand are loaded from the branching point Pl, P2 va a servo pressure-reducing valve Oi or 2 with a pressure Pz, or Pz2, which is usually lower than the pressure at the point
P1, P2. The construction of the servo pressure valves 01, 2 is according to a known design. These valves are able to convert, for example, an electrical value which can be continuously adjusted within certain limits, into a correspondingly continuously adjustable pressure value, particularly a reducing pressure value. These valves 01, 02 are connected to a return flow tank via an evacuation line, so that pressure medium which is to be evacuated from the lower annular chambers Klv, K2v can reach the return flow tank T directly. An unavoidable leakage loss is also shown with dotted lines and the reference L.
On the side of the servo pressurereducing valves Oi, 2 which corresponds to the reduced pressure Pz1, Pz2, a pressure measuring cell M,, M2 is connected, which converts the pressure prevailing on the lower face of the piston E" E2 to a corresponding value a,, a2, for example, into an electrical voltage. This value is supplied to a difference forming element
Di, or Di, respectively, and is there compared with a value which corresponds to a desired pressure setting and which is previously set by an adjustment element Rl or
R2 respectively, for example, by an adjustable potentiometer. The resulting comparative value is amplified by a control amplifier
L, or L2 constituted, for example, by several separate cascade-connected amplifiers, and is supplied via another difference-forming element Ds, or Ds2 respectively. the function of which will be explained later, to the input of an output amplifier N, or N2 respectively, at the output of which the adjustment value y, or Y2 respectively emerges, which determines the adjustment of the servo pressure-reducing valve Oi or 02 respectively. Thus one of the control circuits for monitoring the pressure in the relevant lower annular chamber Kiy, K2v in relation to the pressure in the upper annular chamber Kix, K2x involved is defined.
The control circuit for pre-determined pressure setting which has just been described, which is present in two or more fold construction, for example, in fourfold construction, is subordinated to another common regulator U in which a preset value for a reduction of the thickness of the material can be set. In this case as well, for example, a voltage value generator is involved, which is perhaps actuated by a potentiometer. This regulator U therefore serves to adjust the desired value; it does not prevent the roller frames from moving apart, say, as the material to be straightened is being inserted.
To determine the actual value of the setting of the actual gap between the roller frames there is an actual value indicator II or I2 which is connected mechanically, as shown in the Drawing, to the upper roller frame on one side and to the lower roller frame on the other side. This actual value indicator II or I2 supplies on its output side an analogue signal 1 or 2 respectively, which corresponds to the actual value of the distance between the straightening rollers of the upper and lower roller frames at any given moment.
In order to obtain a comparison between the desired value which can be set in the regulator U and the actual value, the output signal supplied by the subordinated regulator U and the output signal 031 or p of the actual value indicator I, or 12 respectively is supplied to a difference-forming element
Dr, or Dr2. The difference value obtained is amplified by an amplifier T1 or T2 respectively and supplied as a correction signal to the difference-forming element Dsl or Ds2 already mentioned. The circuit completed round the regulator U therefore makes possible not only a controlled adjustment of the pressure, but also a correction adjustment with regard to the gap between the straightening rollers of the upper and lower roller frame respectively. Thus, fully automatic operation of the straightening machine is possible, since the relative positioning forces are monitored not only to a specific pressure, but also to a specific final straightened dimension.
The actual value indicator has a mechanical stop element Ql or Q2 respectively arranged on its input and output sides, by means of which the minimum sheet thicknesses which can still be treated by a specific straightening machine are determined. If the straightening gap becomes so narrow that this minimum dimension is reached, then the upper frame indicator arm which is connected to the actual value indicator I, or I2 runs up against the mechanical stop element Q, or Q2 respectively, annd restricts any further movement of the roller frames towards each other.
The task set is accomplished completely with the invention, so that monitoring, particularly measurement gauge monitoring, and manual adjustment of the relative position of the roller frames are eliminated.
In an improved construction form, by using a subordinated control circuit, fully automatic operation is possible.
WHAT WE CLAIM IS:
1. A machine for straightening sheet metal or other flat material comprising a material inlet and a material outlet defining a path of material flow; an upper roller frame disposed between said inlet and outlet along said path, said upper roller frame housing a first plurality of forcibly driven parallel straightening rollers disposed along said path and transverse with respect thereto; a lower roller frame disposed between said inlet and outlet along said path, said lower roller frame housing a second plurality of forcibly driven parallel straightening rollers disposed along said path and transverse with respct thereto, the axes of said second plurality of straightening rollers being arranged in vertical planes which are parallel with and between vertical planes in which the axes of the first plurality of straightening rollers lie; at least one pair of pressure medium operated piston assemb
lies for causing relative movement between
said first and second frames and for locking said frames at predetermined relative posi
tions, a first assembly of said pair intercon
necting said upper and lower frames in the vicinity of said inlet, and a second assembly
of said pair interconnecting said upper and
lower frames in the vicinity of said outlet,
each of said piston assemblies comprising a
cylinder chamber contained in one of said
upper and lower frames, a piston reciprocat
ing in said chamber, said upper annular
chamber of each piston assembly having a smaller effective cross-sectonal area than a
respective said lower annular chamber, a
guide bore provided in said cylinder cham
ber, a piston rod having one end coupled to
said piston and another end projecting
through said guide bore and coupled to the
other of said upper and lower frames, and
means for directly connecting each of the
upper annular chambers of said pistion
assemblies with an adjustable pressure
medium source and each of said lower
annular chambers of said piston assemblies
to the output of a servo-controlled pressure
reducing valve supplying a pressure medium
from a source.
2. A machine according to claim 1 wherein a pair of said piston assemblies is provided in the vicinity of said inlet and a pair of said piston assemblies is provided in the vicinity of said outlet, each of said piston assemblies having its respective upper annular chamber connected directly to said pressure medium source, each piston assembly of said inlet pair having its lower annular chamber connected to the output of a first servo controlled pressure-reducing valve, and each piston assembly of said outlet pair having its lower annular chamber connected to the output of a second servo controlled pressure-reducing valve.
3. A machine according to claim 1 or 2 wherein said another end of said piston rod is coupled to said other of said upper and lower frames with a ball and socket coupling.
4. A machine according to claim 2 further comprising a separate control circuit for each of said first and second servo controlled pressure-reducing valves, each of said control circuits comprising; means for sensing the pressure of the pressure medium in the lower annular chamber of at least one of the respective pairs of piston assemblies associated with a servo controlled pressurereducing valve, and for providing a first electrical signal representative of said sensed pressure; means for setting a desired pressure level, and for forming a second electrical signal representative of said desired pressure; first means for comparing said first and second electrical signals for providing a third electrical signal representing the difference between said desired and sensed pressure levels; and means for applying said third electrical signal to a control input of said associated servo controlled pressure-reducing valve.
5. A machine according to claim 4 wherein said means for setting for each control circuit is located remotely from said respective first and second servo controlled pressure-reducing valves.
6. A machine according to claim 5 wherein said means for setting for each control circuit can be set to a value different from the values set in the means for setting for the other control circuit.
7. A machine according to claim 4 further comprising a stop means for limiting relative movement of said upper and lower frames towards each other when a predetermined minimum gap distance between them is realized.
8. A machine according to claim 7 wherein said stop means comprises first and second adjustable stop devices positioned respectively in the vicinity of said inlet and outlet.
9. A machine according to claim 4 further comprising a regulator means associated
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (13)
1. A machine for straightening sheet metal or other flat material comprising a material inlet and a material outlet defining a path of material flow; an upper roller frame disposed between said inlet and outlet along said path, said upper roller frame housing a first plurality of forcibly driven parallel straightening rollers disposed along said path and transverse with respect thereto; a lower roller frame disposed between said inlet and outlet along said path, said lower roller frame housing a second plurality of forcibly driven parallel straightening rollers disposed along said path and transverse with respct thereto, the axes of said second plurality of straightening rollers being arranged in vertical planes which are parallel with and between vertical planes in which the axes of the first plurality of straightening rollers lie; at least one pair of pressure medium operated piston assemb
lies for causing relative movement between
said first and second frames and for locking said frames at predetermined relative posi
tions, a first assembly of said pair intercon
necting said upper and lower frames in the vicinity of said inlet, and a second assembly
of said pair interconnecting said upper and
lower frames in the vicinity of said outlet,
each of said piston assemblies comprising a
cylinder chamber contained in one of said
upper and lower frames, a piston reciprocat
ing in said chamber, said upper annular
chamber of each piston assembly having a smaller effective cross-sectonal area than a
respective said lower annular chamber, a
guide bore provided in said cylinder cham
ber, a piston rod having one end coupled to
said piston and another end projecting
through said guide bore and coupled to the
other of said upper and lower frames, and
means for directly connecting each of the
upper annular chambers of said pistion
assemblies with an adjustable pressure
medium source and each of said lower
annular chambers of said piston assemblies
to the output of a servo-controlled pressure
reducing valve supplying a pressure medium
from a source.
2. A machine according to claim 1 wherein a pair of said piston assemblies is provided in the vicinity of said inlet and a pair of said piston assemblies is provided in the vicinity of said outlet, each of said piston assemblies having its respective upper annular chamber connected directly to said pressure medium source, each piston assembly of said inlet pair having its lower annular chamber connected to the output of a first servo controlled pressure-reducing valve, and each piston assembly of said outlet pair having its lower annular chamber connected to the output of a second servo controlled pressure-reducing valve.
3. A machine according to claim 1 or 2 wherein said another end of said piston rod is coupled to said other of said upper and lower frames with a ball and socket coupling.
4. A machine according to claim 2 further comprising a separate control circuit for each of said first and second servo controlled pressure-reducing valves, each of said control circuits comprising; means for sensing the pressure of the pressure medium in the lower annular chamber of at least one of the respective pairs of piston assemblies associated with a servo controlled pressurereducing valve, and for providing a first electrical signal representative of said sensed pressure; means for setting a desired pressure level, and for forming a second electrical signal representative of said desired pressure; first means for comparing said first and second electrical signals for providing a third electrical signal representing the difference between said desired and sensed pressure levels; and means for applying said third electrical signal to a control input of said associated servo controlled pressure-reducing valve.
5. A machine according to claim 4 wherein said means for setting for each control circuit is located remotely from said respective first and second servo controlled pressure-reducing valves.
6. A machine according to claim 5 wherein said means for setting for each control circuit can be set to a value different from the values set in the means for setting for the other control circuit.
7. A machine according to claim 4 further comprising a stop means for limiting relative movement of said upper and lower frames towards each other when a predetermined minimum gap distance between them is realized.
8. A machine according to claim 7 wherein said stop means comprises first and second adjustable stop devices positioned respectively in the vicinity of said inlet and outlet.
9. A machine according to claim 4 further comprising a regulator means associated
with said control circuits for pre-setting said control circuits with a desired value of material thickness.
10. A machine according to claim 9 wherein said regulator means comprises; first means located in the vicinity of said inlet for measuring the actual value of the gap between said upper and lower frames and for forming a fourth electrical signal representing the actual value of the gap at said inlet; second means located in the vicinity of said outlet for measuring the actual value of the gap between said upper and lower frames and for forming a fifth electrical signal representing the actual value of the gap at said output; means for setting a desired gap value and for forming a sixth electrical signal representative of said desired gap value; second comparison means for comparing said fourth and sixth electrical signals for providing a seventh electrical signal representing the difference between the actual gap at said inlet and said desired gap; third comparison means for comparing said fifth and sixth electrical signals for providing an eighth electrical signal representing the difference between the actual gap of said outlet and said desired gap; first combining means for combining said seventh electrical signal with said third electrical signal of one of said control circuits and for applying this combination to a control input of an associated one of said first and second servo controlled pressurereducing valves; and second combining means for combining said eighth electrical signal with said third electrical signal of another of said control circuits and for applying this combination to a control input of an associated one of said first and second servo controlled pressure-reducing valves.
11. A machine according to claim 1 wherein a pair of said piston assemblies is provided in the vicinity of said inlet and a pair of said piston assemblies is provided in the vicinity of said outlet, each of said piston assemblies having its respective upper annular chamber connected to said pressure medium source and its lower annular chamber connected to the output of a respective servo controlled pressure-reducing valve.
12. A machine according to claim 11 further comprising a separate control circuit for each of said servo controlled pressurereducing valves, said control circuit comprising; means for sensing the pressure of the pressure medium in a said lower annular chamber and for providing a first electrical signal representative of said sensed pressure; means for setting a desired pressure level, and for forming a second electrical signal representative of said desired pressure; first means for comparing said first and second electrical signals and for providing a third electrical representing the difference between said desired and sensed pressure levels; and means for applying said third electrical signal to a control input of a respective one of said servo controlled pressure-reducing valves.
13. A machine for straightening sheet metal constructed and arranged substantially as described herein with reference to and as illustrated in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19762657986 DE2657986C3 (en) | 1976-12-21 | 1976-12-21 | Adjustment device for a sheet leveler to adjust the leveling gap |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1581378A true GB1581378A (en) | 1980-12-10 |
Family
ID=5996153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB5199477A Expired GB1581378A (en) | 1976-12-21 | 1977-12-14 | Sheet straightening machine |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS5395166A (en) |
| CH (1) | CH625979A5 (en) |
| DE (1) | DE2657986C3 (en) |
| FR (1) | FR2374975A1 (en) |
| GB (1) | GB1581378A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100402173C (en) * | 2006-06-05 | 2008-07-16 | 洛阳锐腾机械设备有限公司 | Combination system for servo-roll-separating and quick-backward of cross-roll straightening machine |
| CN100434202C (en) * | 2006-12-22 | 2008-11-19 | 洛阳锐腾机械设备有限公司 | Two-stage tandem cross roll straightener bite servo and regulating system |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2704684B2 (en) * | 1977-02-04 | 1981-02-26 | Horst Zerhoch Vorrichtungs- Und Maschinenbau Kg, 7573 Sinzheim | Straightening machine for straightening sheet metal and flat materials |
| DE3308616C2 (en) * | 1983-03-11 | 1993-11-25 | Schloemann Siemag Ag | Method and machine for straightening sheet metal |
| JPH0644813B2 (en) * | 1984-03-30 | 1994-06-08 | パイオニア株式会社 | Information playback device |
| CN102699088A (en) * | 2012-06-11 | 2012-10-03 | 芜湖汉光立体停车设备有限公司 | Spacing adjustable device for extruding siding wall panels |
| CN108994217B (en) * | 2018-10-16 | 2020-07-31 | 章警帅 | Bar straightener for construction |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR745340A (en) * | 1933-05-09 | |||
| US1968389A (en) * | 1932-05-27 | 1934-07-31 | Sutton Eng Co | Sheet leveler |
| US2944585A (en) * | 1956-02-14 | 1960-07-12 | Ungerer Fritz | Method of manufacturing curved structural members from sheet metal |
| US3031009A (en) * | 1958-12-15 | 1962-04-24 | United States Steel Corp | Roller leveler |
| US3226965A (en) * | 1962-01-05 | 1966-01-04 | Continental Can Co | Device to achieve multiple reverse flexing of continuous steel strip |
| FR1347890A (en) * | 1962-11-23 | 1964-01-04 | Spidem Ste Nle | Clamping system for roller leveler |
| GB1047059A (en) * | 1963-10-19 | 1966-11-02 | Ungerer Fritz | Machine for straightening sheet metal |
| FR1503690A (en) * | 1966-10-10 | 1967-12-01 | Pressed Steel Fisher Ltd | Advanced machine for processing metal sheets and bands |
| US3715903A (en) * | 1971-01-13 | 1973-02-13 | P A S Artco Inc | Strip stock uncoiler and straightening device |
-
1976
- 1976-12-21 DE DE19762657986 patent/DE2657986C3/en not_active Expired
-
1977
- 1977-12-09 CH CH1510677A patent/CH625979A5/en not_active IP Right Cessation
- 1977-12-14 GB GB5199477A patent/GB1581378A/en not_active Expired
- 1977-12-21 FR FR7738583A patent/FR2374975A1/en active Granted
- 1977-12-21 JP JP15302077A patent/JPS5395166A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100402173C (en) * | 2006-06-05 | 2008-07-16 | 洛阳锐腾机械设备有限公司 | Combination system for servo-roll-separating and quick-backward of cross-roll straightening machine |
| CN100434202C (en) * | 2006-12-22 | 2008-11-19 | 洛阳锐腾机械设备有限公司 | Two-stage tandem cross roll straightener bite servo and regulating system |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2657986C3 (en) | 1981-07-09 |
| JPS5395166A (en) | 1978-08-19 |
| JPS5726168B2 (en) | 1982-06-03 |
| FR2374975A1 (en) | 1978-07-21 |
| FR2374975B1 (en) | 1984-08-31 |
| DE2657986B2 (en) | 1980-08-07 |
| DE2657986A1 (en) | 1978-06-22 |
| CH625979A5 (en) | 1981-10-30 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| 732 | Registration of transactions, instruments or events in the register (sect. 32/1977) | ||
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19941214 |