Prod-Masz Abkantbank24 Biegemaschine Stroj Za Upogibanje Z Vrtljivim Kolesom nakup rabljenega (101.391)

Stanje: novo, Condition: New Delivery time: approx. 12 – 14 weeks from order Country of origin: Italy Price: €32,900 Leasing rate: €628.39 Max. diameter (steel tube): 50 mm Length: 4000 mm Width: 950 mm Height: 1250 mm Weight: 430 kg Max. bending section modulus: 6 cm³ Standard steel tube: 50 x 3.31 mm Gas tube for pipelines: Ø 1”1/4 mm Stainless steel: Ø 50 x 2.5 mm Square tube: 40 x 40 x 4 mm Rectangular tube (horizontal): 25 x 50 x 6 mm Rectangular tube (vertical): 50 x 25 x 2.7 mm Max. outside diameter: 60 mm Iijdpfx Aasynmrns Uea Max. bending radius: 200 mm Min. bending radius: 20 mm Max. bending angle: 210° Speed: 1.25 / 2.5 Motor: 3.5 kW Hydraulic tank capacity: 15 l With mandrel bending device, length 3 m Can be used with or without mandrel Programmable bending angle (C-axis) with intuitive NC control Manual longitudinal feed (Y1 axis) and tube rotation (B axis) with mechanical stops and digital readouts Two speed levels Independent adjustment of clamping and pressure dies Patented system for stabilizing the hydraulic pressure of the pressure die Quick-change tool system Pneumatic jaw clamping Operating manual ALTERNATIVE: Model with 6 m mandrel bending device – price on request

Stanje: dober (rabljeno), Leto izdelave: 2002, Leta 2019 je bila vgrajena nova krmilna enota za 14.000 €. Maksimalni premer upogibanja: 63,5 mm Minimalni upogibni radij: 32 mm Motor: 30 kW Iiodpfxeykl Rzs Aa Uoa

Stanje: rabljeno, Leto izdelave: 2005, dolžina mize: 6.000 mm, skupna dolžina: 6.000 mm, vhodna napetost: 400 V, Ercolina EB 45 z orodji za cevi v palcih Iijdpfx Aeyr H A Isa Uea Ogled in demonstracija sta možna po dogovoru

Stanje: dober (rabljeno), Leto izdelave: 1996, vrsta upravljanja: CNC krmiljenje, Premer cevi: 4-28 mm Debelina stene: / mm Minimalni polmer upogibanja: 1,5 x D - 2,0 x D mm Krmiljenje: Siemens LOGO Dovodna zmogljivost: 4,5 l/min Maksimalni upogibni kot +/-190° Nazivni tlak: 250 bar Obratovalni tlak: 3095 bar Dovodna zmogljivost: 4,5 l/min Skupna potrebna moč: 1,5 kW Iiedpjyqxnaefx Aa Uja Pogon: hidravlični valj in valjčna veriga

Stanje: rabljeno, Hidravlični profilni upogibni stroj, cevni upogibni stroj LANG tip Ondomat 60 Tovarniška št.: 2589 Leto izdelave: 1970 Največja zmogljivost upogibanja: Ø 60 x 2 mm Tlačna sila: 20 ton Protisila: 7,5 ton Največji kot upogiba: 135° Hod orodja: 250 mm Največja širina orodja: 125 mm Zunanja širina orodnega nihala: 90 mm Moč motorja: 18 kW Priključna napetost: 380 V, 50 Hz - Hidravlični postopek upogibanja s protitlačnim cilindrom za upogibanje brez gub - Do 10 različnih kotov upogiba zapored prek avtomatskega revolverskega stikalnika - Dvoročno upravljalna konzola - 1 kos upogibnega orodja Ø 30 mm, širina nihala 78 mm, širina nasprotnega ležišča 50 mm Iedpfx Aaoyi Hrwj Ujia Potrebni prostor D x Š x V: 2000 x 750 x 1500 mm Teža: pribl. 2 toni V dobrem stanju

Stanje: rabljeno, Leto izdelave: 1985, Sheet thickness: 2.25 mm Total power requirement: 1.1 kW Sheet length: 2025 mm Motorized Folding Machine: Kramer Mod. Amaut II 2000, 2025 mm x 2.25 mm Working length: 2025 mm Material thickness: 2.25 mm Min. flange width: 5 x s Min. inside radius: 1.5 – 2 x s Adjustable lower and bending beam: 90 mm For round bending: 90 mm Maximum upper beam working height: 190 mm Maximum opening width of upper beam: 290 mm Cycle time per operation: 7.0 sec External dimensions approx.: 3000 x 1000 x 1650 mm Includes: - Control panel on the right side of the machine - Simple bending angle adjustment via the control panel - Option to switch to automatic, semi-automatic, or jog mode Ijdpfxevaatfe Aa Ueia - Potentiometer for angle setting - Foot switch Used, in good condition

Stanje: zelo dobro (rabljeno), Leto izdelave: 2005, Tehnični podatki: Min. zmogljivost upogibanja jekla: ø 19,8 x 3,0 mm Maks. zmogljivost upogibanja jekla: ø 76,1 x 3,0 mm Maks. zmogljivost upogibanja nerjavečega jekla: 76,1 x 1,65 mm Upogibni polmer: maks. 150 mm Upogibni kot: maks. 190° Smer upogibanja v smeri urinega kazalca (desno) Maks. dolžina cevi: 6000 mm Premični upravljalni pult CE oznaka Isdpfsynt Icox Aa Ueia Dimenzije (dolžina x širina x višina): pribl. 7200 x 2000 x 1650 mm Teža: pribl. 3 t Oprema: Naprava proti zasuku Upogibni kot programabilen Digitalni prikaz premika Digitalni prikaz zasuka 1 x pomični predalnik Vpenjalne čeljusti Stanje: zelo dobro stanje, malo rabljena Prodajalec ne odgovarja za napake pri pisanju ali prenosu podatkov. Stroj je glede na starost v ustreznem optičnem, tehničnem in obrabnem stanju; rabljeni stroji se prodajajo brez kakršnegakoli jamstva.

Stanje: rabljeno, Sheet length: 1050 mm Width: 800 mm Height: 1400 mm Sheet thickness: 3 mm Folding machine: Iiedevaar Iopfx Aa Uja Kramer - Dimensions (L x W x H): approx. 2100 mm x 800 mm x 1400 mm - Working width: 1000 mm - Sheet thickness: 3 mm

Stanje: rabljeno, 2-Station Notching and Press Brake Machine EUROMAC Type Multi 220/6R Press Brake, Notching Machine Serial No. M11941298 Year of Manufacture: 1998 Cutting Capacity: 6 mm steel at 45 kg/mm² 4 mm for stainless steel Station I (Notching) Notching angle: 60° to 140° (with special blade from 30° to 140°) Blade length: 220 mm Table size: 950 x 640 mm - Manual angle adjustment via handwheels - Notching angle with installed blade set: 60° to 140° - Hydraulic clamping of upper and lower blades - Automatic cutting clearance adjustment - Sheet hold-down device - Integrated, scaled measuring tapes in the table - Adjustable stop rails with angle setting - Operated by foot pedal Station II (Press Brake Unit) Pressing force: 18 t Table size: 950 x 340 mm Working height: 1100 mm Isdomck Ryopfx Aa Ujia - Infinitely variable stroke speed - Infinitely adjustable stroke limiter - Stroke adjustment up to 30 mm working stroke - Reversible die with 4 x 90° prism, length = 415 mm - Top tool 90°, length = 415 mm Motor power: 4 kW Power connection: 400 Volt, 50 Hz Space requirement (L x W x H): 1150 x 1050 x 1460 mm Weight: approx. 1000 kg Good condition

Stanje: rabljeno, Servo Press Brake SAFAN Type SMK-P 50-2550 TS1 Serial No. MK 285 Year of manufacture: 1998 CNC control: SAFAN software version 5.07 TS1 Pressing force: 500 kN (50 tons) Working length: 2550 mm Stroke: 215 mm Distance between side frames: 2700 mm Tool installation height: max. 414 mm Table width: 55 mm Table height above floor: 950 mm Approach speed: approx. 75 mm/s Return speed: approx. 75 mm/s Working speed: approx. 1.6 to 15 mm/s Motor power: 9 kW Electrical connection: 400 Volt, 50 Hz, 9 kW - 4-axis CNC control SAFAN software version 5.07 TS1, Y1 and Y2 axis ram - 2-axis backgauge: X-axis backgauge depth adjustment, R-axis backgauge height adjustment - 2 backgauge fingers, laterally manually adjustable (Z1, Z2) - Ram drive via 2 servomotors and belt drive - Infinitely variable working speed - Operation by electric foot pedal and/or two-hand control panel - 13 clamp holders for top tool UKB system, type 50.571 (UKB system A) - Tool mount for bottom tool: 55 mm width with 13 mm groove, groove depth 21 mm (Trumpf system or UKB system B) - Supplied without press brake tools (new tools from UKB cost approx. 3,600 EUR net) - Read total operating hours: 8,120 h - Working strokes: 1,049,789 strokes Space required (L x W x H): 3450 x 1850 x 2650 mm Isdpfexpqy Dsx Aa Ueia Weight: 5000 kg Good condition

Stanje: rabljeno, CNC Press Brake AMADA Model HFBO 50 x 2000 Serial No.: HFBO 50 20 S60906 Year of manufacture: 1996 Press brake with 8-axis CNC control - Operateur II Press capacity: 50 tons Working length: 2,090 mm Stroke: 200 mm Throat depth: 420 mm Clearance between side frames: 1,660 mm Max. tool installation height: 460 mm Table width: 60 mm Table height above floor: 910 mm Motor power: 4.5 kW Power supply: 400 V, 50 Hz, 20 A - 8-axis CNC control Operateur II: Y1-Y2 / X1-X2 / Z1-Z2 / R1-R2 - 2 freely programmable back gauge fingers, adjustable laterally and in height (Z1+Z2+R1+R2) - Press beam with servo valves and measuring system Y1 and Y2 Ijdpfx Asw Iq Ugea Ujia - Operation via electric foot switch and/or two-hand control panel - Mechanical lever-type tool clamping for the upper tool (5 units AMADA Expert, 5 units UKB 50.667 H=120 mm) - Tool holder for lower tool, 60 mm wide - Upper tooling set, 11-piece, 30°, total length 1,675 mm - consisting of: 1x 835 / 1x 300 / 1x 165 / 1x 50 / 1x 45 / 1x 35 / 1x 20 / 1x 15 / 1x 10 / 2x 100 mm (end pieces) - Lower tooling, 2-piece, 88° - V8, total length 1,250 mm - consisting of: 1x 835 / 1x 415 mm - Indicated operating hours: 30,537 h - Operating manual, electrical diagram, spare parts book available Weight: 4,700 kg Good condition

Leto izdelave: 1986, stanje: pripravljen za uporabo (rabljen), Working width: 1250 mm, max. sheet thickness: 3 mm, equipped with loading table, vacuum lifter, feed table with rollers, ejector, output table, control console and manual. Inspection is possible. Available from March 2024. Isdpfx Ajq A Un Sja Uoia

Stanje: zelo dobro (rabljeno), Funkcionalnost: popolnoma funkcionalen, Leto izdelave: 2022, vrsta upravljanja: CNC krmiljenje, stopnja avtomatizacije: samodejen, Fully automatic swivel bending machine with storage connection Manufacturer: TRUMPF Model: TruBend Center 7030 (B34) Year of manufacture: 2022 Control: TecZone Fold programming, touch operation, additional display TECHNICAL DATA: Max. bending length: 3,123 mm Min. bending length: 200 mm Max. box height: 220 mm Max. workpiece size: 3,120 x 1,500 mm Max. workpiece diagonal: 3,460 mm Max. material thickness: Steel: 3 mm, Stainless steel: 2.2 mm, Aluminium: 4 mm Min. material thickness: 0.4 mm Min. bending depth (standard tool): 145 mm Min. bending depth (pivoting hold-down tool): 30 mm Connected load: 80 kVA Average power consumption: 15 kW Space requirements (L x W x H): 8,348 x 5,113 x 3,345 mm (Min. hall height: 4,300 mm) EQUIPMENT: - Front gauge Iedox Tii Ispfx Aa Usia - Loading grippers - Rotary part manipulator - 2-axis part manipulator with vacuum modules - 5-axis back gauge - Optical angle assistant - Hold-down tools - ToolMaster - Control unit with foot switch - ACB Laser (Automatically Controlled Bending) - Set of 3-surface vacuum modules - Set of 2-surface magnet module - Bending tools OBW90 and UBW90 - Pivoting hold-down tool ENW - Additional bending tool function ZBW Extensive set of various tools included AUTOMATION: - Robot and storage interface (use without storage requires adaptation) - Loading and unloading unit with storage connection (without pallet), incl. for sheet separation - Safety fence, swing doors, light barriers - Unloading table with conveyor system Further information can also be taken from the pictures. This used machine can be inspected under production conditions. All information without guarantee – sale excludes any warranties or guarantees. Subject to prior sale.

Stanje: dober (rabljeno), Funkcionalnost: popolnoma funkcionalen, Leto izdelave: 2009, Rabljeni stroj za krivljenje cevi Jutec Tip: 5000 Kapaciteta: do pribl. 40 mm Dolžina trna: 4500 mm CNC vodenje Avtomatska glava Ročno vrtljiva glava s hidravličnim vpenjanjem Iiedpfx Aaoyfmwxj Uoa Vključno s 3 kompleti orodij Letnik izdelave: 2009 Zelo malo uporabljen

Stanje: novo, Leto izdelave: 2025, Ring Bending Machine, Manufacturer: Zopf Model: ZB 100/3 H – NC controlled - Three driven rollers with knurled surface - Hydraulic adjustment of the top roller - Working positions: horizontal and vertical - Shafts mounted in tapered roller bearings - Use of interchangeable slide rails on the guide carriage - Roller diameter: 215 mm - Shaft diameter: 60 mm - Shaft rotation speed: 6 rpm - Drive motor: 1.5 kW - Hydraulic cylinder pressing force: 180 kN - Bending capacity up to 80x15 mm edgewise - Round tube up to 100x2 mm - Angle iron: 70x70x8 mm Iisdpsd Ey A Aefx Aa Uja - Weight: 800 kg NC Control: 2-axis control Touchscreen Storage for 1,000 programs with up to 19 steps each Interpolation

Stanje: novo, Leto izdelave: 2022, Press brake, 10 tons, with welding table - Electric, with 400 Volt, 50 Hz, 3-phase motor Iedpfx Aspz Hztoa Ueia - 1 kW power - Supplied with punch and die - Bending height: 150 mm - With perforated table - Table dimensions: 1000 x 1000 mm - Mobile, with castors - Welding table supplied without clamps or accessories

Stanje: dober (rabljeno), Leto izdelave: 1993, Ausgestattet mit: - 9" Schneidkopf - Vorschubstöcke - Profilabrichtung (Crowning) - Automatischer Lader - Heidenhain-Maßstäbe - Variabler Vorschub/Geschwindigkeit Schneidkopf - RS232-Schnittstelle - Trabon-Schmiersystem - Kühlsystem mit magnetischem Spanabscheider - AC-Servomotoren - Rundumspritzschutz - Signalleuchte (Stack Light) - Bedienungsanleitungen Technische Daten: - Zahnraddurchmesser Werkstück (9" & 12" Schneidkopf): 1–12", 1–8" - Max. Werkstück-Ø (9" & 12" Schneidkopf): 12,5", 8,5" - Teilungsbereich (DP): 4–20 - Spitzenweite: 23" - Schneidkopf-Drehzahl (9" & 12"): 50–500, 50–400 U/min Iiodpfx Aaeruahwe Usa - Max. Tischverfahrweg konventionell, tangential, diagonal: 5", 2", 5"–2" - Diagonalverstellwinkel Geradeabrichten: 0°–90° - Verstellwinkel Kronenabrichten: max. ca. 45° - Max. Tischwinkel Kronenform: 5° - Max. Tischwinkel Kegel (Taper): 1°30' - Max. Kreuzachsenwinkel Schneidkopf links/rechts: 25° - Kreuztisch-Vorschub (Zoll/min): 0,5–35 - Tisch-Auf-/Abbewegung (Zoll/min): 0,004–12,5 - Hub Tisch Auf/Ab: 8 1/8" - Gewicht ca.: 4.350 kg

Stanje: novo, Leto izdelave: 2025, The highest precision of this folding machine guarantees and enables the bending of steel sheets up to 1 mm, and for all non-ferrous metals, 30% more bending capacity. Prod-Masz folding machines are characterized by high quality, robust construction, optimal functionality, and attractive design! Only premium materials are used in the manufacture of these folding machines. Highly precise folding machine for steel, copper, zinc, and aluminium sheets. These folding machines and all common spare parts are available from stock. Isdpfx Ajctuptja Uoia ZGR-3140/1.0 Maximum working width of the folding machine: 3140 mm Bending capacity: up to 1.0 mm (steel sheet) Maximum bending angle of the bending machine: 145 degrees Thickness of the bending beam: 20 mm Cutting with rotary shear across the full working width Upper beam adjustable in three positions Clearance: 80 mm Degree scale Angle stop Depth stops Weight of the folding machine: approx. 600 kg Rotary shear for up to 0.8 mm (plus 350 Euros) Manual seam folder (plus 75 Euros) Delivery costs: 360 Euros Price: 3400 Euros Delivery time: weekly Cash on delivery We look forward to your inquiry! Invoices are issued with 0% VAT as intra-community deliveries or plus 19% VAT.

Stanje: novo, Leto izdelave: 2025, The bending machine presented here is our bestseller, renowned not only for its highest quality but also for its extensive capabilities in sheet metal bending. It is also worth highlighting that the sheet metal bending machines we offer, both mobile and stationary, are immediately available from stock. Furthermore, we deliver directly to customers across Europe, as our products are highly popular and valued not only in Germany but worldwide. Folding Machine 3.14m / 0.8mm Technical Data: - Maximum working width: 3140 mm - Bending capacity: up to 0.8 mm (steel sheet) - Bending angle: max. 145 degrees - Bending rail thickness: 24 mm - Cutting along the entire working width with the rotary shear Isdpoc Uh Atefx Aa Usia - Upper beam can be raised to three positions - Clearance: 80 mm - Degree scale - Angle stop - Front and depth stops - Weight: approx. 400 kg - Rotary shear (max. cutting capacity up to 0.8 mm / steel sheet) available for an additional €350 - The machine complies with CE guidelines and comes with a 12-month warranty. Price: €2,050.00 Delivery costs: €360.00 Cash payment on delivery Delivery within 4 days from order date We look forward to your enquiry! Invoices are issued with 0% as intra-community supply or with an additional 19% VAT.

Stanje: novo, Leto izdelave: 2025, Model: ZGR-3140/1.0 Technical Specifications: - Maximum working width: 3140 mm - Bending capacity: up to 1.0 mm (steel sheet) - Bending angle: max. 145 degrees - Bending beam thickness: 20 mm - Cutting with roller shear across the entire working width Iedpschwa Dsfx Aa Usia - Upper beam lift in three positions - Throat opening: 80 mm - Degree scale - Angle gauge - Depth stops - Weight: approx. 560 kg - The roller shear (max. cutting capacity up to 0.8 mm / steel sheet) + €350 - The machine complies with CE guidelines and comes with a 12-month warranty. Delivery: weekly Cash payment upon delivery Delivery fee: €360. Direct from Poland We look forward to hearing from you!

Stanje: novo, Leto izdelave: 2026, The best-selling and most reliable folding machine from PROD-MASZ! Fast delivery times and high quality! Folding machine from the one and only genuine, reliable manufacturer PROD MASZ® Technical specifications: Iijdpfsb Eg Hyjx Aa Usa - Maximum working width: 2140 mm - Bending capacity: up to 0.8 mm (steel sheet) - Bending angle: max. 145 degrees - Cutting with the rotary shear across the entire working width - Bending beam thickness: 15 mm - Upper beam can be raised in three positions - Upper beam stroke: 80 mm Angle scale Angle stop Rear frame for holding the sheet Front depth stops - Weight: approx. 180 kg The rotary shear (max. cutting capacity 0.8 mm / steel) The machine complies with CE guidelines and comes with a 12-month warranty. Price: €1,050.00 Delivery cost: €180 Rotary shear 0.8 mm – plus €350 Manual seam closer – plus €75 Delivery date: every week Cash payment on delivery! We look forward to hearing from you! Invoices are issued with 0% VAT as intra-community supply or with an additional 19% VAT.

Stanje: novo, Leto izdelave: 2026, Folding Bench by PROD-MASZ – Your Best Choice! Reliable equipment and on-time deliveries. Iijdpjb Na Eqjfx Aa Uoa FOLDING BENCH 2.14 m / 1.2mm Shipping: €180 Those who know us, know that we keep our word :) Bending angle: 145° Working length: 2.14 m Width: 0.90 m Height: 1.20 m Clearance of upper beam: 80 mm Bending beam: 24 mm Steel sheet: 1.2 mm For non-ferrous metals, approx. 30% higher bending capacity. The adjustment system enables precise bends for different sheet thicknesses. The rear support is stable and easy to dismantle. Weight: 290 kg Rotary shear 0.8 mm: plus €350 Manual beading machine: plus €75 Delivery time: weekly Cash payment upon delivery We look forward to your inquiry! Invoices are issued with 0% VAT as intra-community supply or plus 19% VAT (German invoice).

Stanje: novo, Leto izdelave: 2025, On-time delivery, reliable equipment! Are you looking for quality and expertise for your sheet metal bending machine? Then we are the right partner by your side. Folding Machine ZGR-2000T/0.8 incl. transport rollers Maximum working length of folding machine: 2140 mm Bending capacity: up to 0.8 mm (steel sheet) Titanium-zinc sheet: 0.8 mm, aluminium sheet: 1.2 mm, copper sheet: 1.25 mm Maximum bending angle of the machine: 145 degrees Cutting with roller shear across the entire working width Bending beam thickness: 15 mm Cutting with roller shear across the entire working width Upper beam lifting in three positions Upper beam stroke: 80 mm Angle scale Weight of folding machine: approx. 180 kg Roller shear for 0.8 mm: plus 350 Euro Hand seam forming machine: 75 Euro Delivery costs: 180 Euro Price: 1350 Euro Ijdpfxscxu Uxo Aa Ueia Delivery date: weekly Cash payment on delivery We look forward to your enquiry! Invoices are issued with 0% VAT as an intra-community delivery or plus 19% VAT.

Stanje: novo, Leto izdelave: 2025, Company Prod-Masz is your competent and professional partner for the manufacturing of sheet metal working machines. Trust, honesty, and reliability are not just empty words for us! Iisdpfsccfh Hex Aa Uoa Model: ZGR-2140/1.2 Technical specifications: - Maximum working width: 2140 mm - Bending capacity: up to 1.2 mm (steel sheet) - Bending angle: max. 145 degrees - Bending beam thickness: 24 mm - Upper beam can be raised in three positions - Gas pressure springs - Clearance opening: 80 mm - Angle scale - Angle stop - Rear frame for sheet support - Front depth stops - Weight: approx. 290 kg - The machine complies with CE regulations and comes with a 12-month warranty. Roller shear for up to 0.8 mm sheet thickness available for an additional 350 Euros Price: €1,550.00 Shipping: €180 Delivery time: 2-4 days Cash payment upon delivery We look forward to hearing from you!

Stanje: novo, Leto izdelave: 2026, Folding Machine ZGR-2140/0.8/145* with integrated magnets, 2 levers on the right and left Why should you choose our folding machines? Firstly, because this folding machine is a bestseller at Prod-Masz. It is a CE-certified product, confirming the highest quality, precise CNC manufacturing, and safe operation of our bending machines throughout the EU. Additionally, we offer a 12-month manufacturer's warranty, irrespective of usage intensity. Manual folding machine for craft and industrial applications. Steel capacity 0.8 mm, aluminum capacity 1.2 mm. The bending machine stands out due to its robust, high-quality construction, ensuring long service life. A foldable support tray for sheet metal plates facilitates handling larger workpieces. The 15 mm bending beam allows the production of standing seam profiles. Maximum working length of folding machine: 2140 mm Bending capacity: up to 0.8 mm (steel sheet), titanium-zinc sheet: 0.8 mm, aluminum sheet: 1.2 mm, copper sheet: 1.25 mm Maximum bending angle: 145 degrees Cutting with the roller shear across the full working width Bending beam thickness: 15 mm Upper beam can be lifted in three positions Upper beam stroke: 80 mm Angle scale Weight of the folding machine: approx. 180 kg -> One roller shear (max. cutting capacity 0.8 mm / steel) plus 350 euros Iedpocgaa Hjfx Aa Uoia -> One manual seam closing machine plus 75 euros Germany-wide shipping: 180 euros Delivery always at the beginning of the week, Monday to Wednesday -> Payment in cash upon delivery or via advance payment -> 12-month warranty We look forward to hearing from you! -> We issue invoices